* [PATCH 1/4] i2c: busses: i2c-st: Add ST I2C controller
2013-09-18 10:01 [PATCH 0/4] Add I2C support to ST SoCs Maxime COQUELIN
@ 2013-09-18 10:01 ` Maxime COQUELIN
2013-09-18 12:47 ` Gabriel FERNANDEZ
[not found] ` <1379498483-4236-2-git-send-email-maxime.coquelin-qxv4g6HH51o@public.gmane.org>
0 siblings, 2 replies; 17+ messages in thread
From: Maxime COQUELIN @ 2013-09-18 10:01 UTC (permalink / raw)
To: Wolfram Sang, srinivas.kandagatla, Rob Herring, Pawel Moll,
Mark Rutland, Stephen Warren, Ian Campbell, Rob Landley,
Russell King, Grant Likely, devicetree, linux-doc, linux-kernel,
linux-arm-kernel, linux-i2c
Cc: stephen.gallimore, stuart.menefy, Lee Jones, gabriel.fernandez,
olivier.clergeaud, Maxime Coquelin
This patch adds support to SSC (Synchronous Serial Controller)
I2C driver. This IP also supports SPI protocol, but this is not
the aim of this driver.
This IP is embedded in all ST SoCs for Set-top box platorms, and
supports I2C Standard and Fast modes.
Cc: Srinivas Kandagatla <srinivas.kandagatla@st.com>
Signed-off-by: Maxime Coquelin <maxime.coquelin@st.com>
---
Documentation/devicetree/bindings/i2c/i2c-st.txt | 35 ++
drivers/i2c/busses/Kconfig | 10 +
drivers/i2c/busses/Makefile | 1 +
drivers/i2c/busses/i2c-st.c | 713 ++++++++++++++++++++++
drivers/i2c/busses/i2c-st.h | 216 +++++++
5 files changed, 975 insertions(+)
create mode 100644 Documentation/devicetree/bindings/i2c/i2c-st.txt
create mode 100644 drivers/i2c/busses/i2c-st.c
create mode 100644 drivers/i2c/busses/i2c-st.h
diff --git a/Documentation/devicetree/bindings/i2c/i2c-st.txt b/Documentation/devicetree/bindings/i2c/i2c-st.txt
new file mode 100644
index 0000000..a7d6381
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/i2c-st.txt
@@ -0,0 +1,35 @@
+I2C for ST platforms
+
+Required properties :
+- compatible : Must be "st,comms-i2c"
+- reg : Offset and length of the register set for the device
+- interrupts : the interrupt number
+- clocks : phandle to the I2C clock source
+
+Recommended (non-standard) properties :
+- clock-frequency : Desired I2C bus clock frequency in Hz. Otherwise
+ the default 100 kHz frequency will be used. As only Normal and Fast modes
+ are supported, possible values are 100000 and 400000.
+
+Optional (non-standard) properties:
+- st,glitches : Enable timing glitch suppression support.
+- st,glitch-clk : SCL line timinig glitch suppression value in ns.
+- st,glitch-dat : SDA line timinig glitch suppression value in ns.
+- st,hw-glitches : Enable filter glitch suppression support.
+- st,hw-glitch-clk : SCL line filter glitch suppression value in us.
+- st,hw-glitch-dat : SDA line filter glitch suppression value in us.
+
+Examples :
+
+i2c0: i2c@fed40000{
+ compatible = "st,comms-i2c";
+ reg = <0xfed40000 0x110>;
+ interrupts = <GIC_SPI 187 IRQ_TYPE_EDGE_RISING>;
+ clocks = <&CLK_S_ICN_REG_0>;
+ clock-frequency = <400000>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&pinctrl_i2c0_default>;
+ st,glitches;
+ st,glitch-clk = 500;
+ st,glitch-dat = 500;
+};
diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index cdcbd83..18ff129 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -776,6 +776,16 @@ config I2C_RCAR
This driver can also be built as a module. If so, the module
will be called i2c-rcar.
+config I2C_ST
+ tristate "STMicroelectronics SSC I2C support"
+ depends on ARCH_STI
+ help
+ Enable this option to add support for STMicroelectronics SoCs
+ hardware SSC (Synchronous Serial Controller) as an I2C controller.
+
+ This driver can also be built as module. If so, the module
+ will be called i2c-st.
+
comment "External I2C/SMBus adapter drivers"
config I2C_DIOLAN_U2C
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index d00997f..9ea5d422 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -92,5 +92,6 @@ obj-$(CONFIG_I2C_PCA_ISA) += i2c-pca-isa.o
obj-$(CONFIG_I2C_SIBYTE) += i2c-sibyte.o
obj-$(CONFIG_SCx200_ACB) += scx200_acb.o
obj-$(CONFIG_SCx200_I2C) += scx200_i2c.o
+obj-$(CONFIG_I2C_ST) += i2c-st.o
ccflags-$(CONFIG_I2C_DEBUG_BUS) := -DDEBUG
diff --git a/drivers/i2c/busses/i2c-st.c b/drivers/i2c/busses/i2c-st.c
new file mode 100644
index 0000000..fa4451f
--- /dev/null
+++ b/drivers/i2c/busses/i2c-st.c
@@ -0,0 +1,713 @@
+/*
+ * Copyright (C) 2013 STMicroelectronics
+ *
+ * I2C master mode controller driver, used in STMicroelectronics devices.
+ *
+ * Author: Maxime Coquelin <maxime.coquelin@st.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2, as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/i2c.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include "i2c-st.h"
+
+#define DRIVER_NAME "st-i2c"
+
+static struct st_i2c_timings i2c_timings[] = {
+ [I2C_MODE_STANDARD] = {
+ .rate = 100000,
+ .rep_start_hold = 4000,
+ .rep_start_setup = 4700,
+ .start_hold = 4000,
+ .data_setup_time = 250,
+ .stop_setup_time = 4000,
+ .bus_free_time = 4700,
+ .glitch_dat_max = 1200,
+ },
+ [I2C_MODE_FAST] = {
+ .rate = 400000,
+ .rep_start_hold = 600,
+ .rep_start_setup = 600,
+ .start_hold = 1000,
+ .data_setup_time = 500,
+ .stop_setup_time = 900,
+ .bus_free_time = 1300,
+ .glitch_dat_max = 200,
+ },
+};
+
+static void st_i2c_flush_rx_fifo(struct st_i2c_dev *i2c_dev)
+{
+ int count, i;
+
+ /*
+ * Counter only counts up to 7 but fifo size is 8...
+ * When fifo is full, counter is 0 and RIR bit of status register is
+ * set
+ */
+ if (readl(i2c_dev->base + SSC_STA) & SSC_STA_RIR)
+ count = SSC_RXFIFO_SIZE;
+ else
+ count = readl(i2c_dev->base + SSC_RX_FSTAT) &
+ SSC_RX_FSTAT_STATUS;
+
+ for (i = 0; i < count; i++)
+ readl(i2c_dev->base + SSC_RBUF);
+}
+
+static void st_i2c_soft_reset(struct st_i2c_dev *i2c_dev)
+{
+ /*
+ * FIFO needs to be emptied before reseting the IP,
+ * else the controller raises a BUSY error.
+ */
+ st_i2c_flush_rx_fifo(i2c_dev);
+
+ st_i2c_set_bits(i2c_dev->base + SSC_CTL, SSC_CTL_SR);
+ st_i2c_clr_bits(i2c_dev->base + SSC_CTL, SSC_CTL_SR);
+}
+
+/**
+ * st_i2c_hw_config() - Prepare SSC block, calculate and apply tuning timings
+ * @i2c_dev: Controller's private data
+ */
+static void st_i2c_hw_config(struct st_i2c_dev *i2c_dev)
+{
+ unsigned long rate;
+ u32 val, ns_per_clk;
+ struct st_i2c_timings *t = &i2c_timings[i2c_dev->mode];
+ struct st_i2c_glitches *g = &i2c_dev->glitches;
+
+ st_i2c_soft_reset(i2c_dev);
+
+ val = SSC_CLR_REPSTRT | SSC_CLR_NACK | SSC_CLR_SSCARBL |
+ SSC_CLR_SSCAAS | SSC_CLR_SSCSTOP;
+ writel(val, i2c_dev->base + SSC_CLR);
+
+ /* SSC Control register setup */
+ val = SSC_CTL_PO | SSC_CTL_PH | SSC_CTL_HB | SSC_CTL_DATA_WIDTH_9;
+ writel(val, i2c_dev->base + SSC_CTL);
+
+ rate = clk_get_rate(i2c_dev->clk);
+ ns_per_clk = 1000000000 / rate;
+
+ /* Baudrate */
+ val = rate / (2 * t->rate);
+ writel(val, i2c_dev->base + SSC_BRG);
+
+ /* Pre-scaler baudrate */
+ writel(1, i2c_dev->base + SSC_PRE_SCALER_BRG);
+
+ /* Enable I2C mode */
+ writel(SSC_I2C_I2CM, i2c_dev->base + SSC_I2C);
+
+ /* Repeated start hold time */
+ val = (t->rep_start_hold + g->glitch_dat) / ns_per_clk;
+ writel(val, i2c_dev->base + SSC_REP_START_HOLD);
+
+ /* Repeated start set up time */
+ val = (t->rep_start_setup + g->glitch_clk) / ns_per_clk;
+ writel(val, i2c_dev->base + SSC_REP_START_SETUP);
+
+ /* Start hold time */
+ if (g->glitch_dat < t->glitch_dat_max)
+ val = (t->start_hold + g->glitch_dat) / ns_per_clk;
+ else
+ val = (t->start_hold + t->glitch_dat_max) / ns_per_clk;
+ writel(val, i2c_dev->base + SSC_START_HOLD);
+
+ /* Data set up time */
+ val = (t->data_setup_time + g->glitch_dat) / ns_per_clk;
+ writel(val, i2c_dev->base + SSC_DATA_SETUP);
+
+ /* Stop set up time */
+ val = (t->stop_setup_time + g->glitch_clk) / ns_per_clk;
+ writel(val, i2c_dev->base + SSC_STOP_SETUP);
+
+ /* Bus free time */
+ val = (t->bus_free_time + g->glitch_dat) / ns_per_clk;
+ writel(val, i2c_dev->base + SSC_BUS_FREE);
+
+ if (!g->hw_glitches) {
+ writel(0, i2c_dev->base + SSC_NOISE_SUPP_WIDTH);
+ return;
+ }
+
+ /* Prescalers set up */
+ val = rate / 10000000;
+ writel(val, i2c_dev->base + SSC_PRSCALER);
+ writel(val, i2c_dev->base + SSC_PRSCALER_DATAOUT);
+
+ /* Noise suppression witdh */
+ val = g->hw_glitch_clk * rate / 100000000;
+ writel(val, i2c_dev->base + SSC_NOISE_SUPP_WIDTH);
+
+ /* Noise suppression max output data delay width */
+ val = g->hw_glitch_dat * rate / 100000000;
+ writel(val, i2c_dev->base + SSC_NOISE_SUPP_WIDTH_DATAOUT);
+
+ return;
+}
+
+static int st_i2c_wait_free_bus(struct st_i2c_dev *i2c_dev)
+{
+ u32 sta;
+ int i;
+
+ for (i = 0; i < 10; i++) {
+ sta = readl(i2c_dev->base + SSC_STA);
+ if (!(sta & SSC_STA_BUSY))
+ return 0;
+
+ usleep_range(2000, 4000);
+ }
+
+ dev_err(i2c_dev->dev, "bus not free (status = 0x%08x)\n", sta);
+
+ return -EBUSY;
+}
+
+/**
+ * st_i2c_write_tx_fifo() - Write a byte in the Tx FIFO
+ * @i2c_dev: Controller's private data
+ * @byte: Data to write in the Tx FIFO
+ */
+static inline void st_i2c_write_tx_fifo(struct st_i2c_dev *i2c_dev, u8 byte)
+{
+ u16 tbuf = byte << 1;
+
+ writel(tbuf | 1, i2c_dev->base + SSC_TBUF);
+}
+
+/**
+ * st_i2c_wr_fill_tx_fifo() - Fill the Tx FIFO in write mode
+ * @i2c_dev: Controller's private data
+ *
+ * This functions fills the Tx FIFO with I2C transfert buffer when
+ * in write mode.
+ */
+static void st_i2c_wr_fill_tx_fifo(struct st_i2c_dev *i2c_dev)
+{
+ struct st_i2c_client *c = &i2c_dev->client;
+ u32 tx_fstat, sta;
+ int i;
+
+ sta = readl(i2c_dev->base + SSC_STA);
+ if (sta & SSC_STA_TX_FIFO_FULL)
+ return;
+
+ tx_fstat = readl(i2c_dev->base + SSC_TX_FSTAT) & SSC_TX_FSTAT_STATUS;
+
+ if (c->count < (SSC_TXFIFO_SIZE - tx_fstat))
+ i = c->count;
+ else
+ i = SSC_TXFIFO_SIZE - tx_fstat;
+
+ for (; i > 0; i--, c->count--, c->buf++)
+ st_i2c_write_tx_fifo(i2c_dev, *c->buf);
+}
+
+/**
+ * st_i2c_rd_fill_tx_fifo() - Fill the Tx FIFO in read mode
+ * @i2c_dev: Controller's private data
+ *
+ * This functions fills the Tx FIFO with fixed pattern when
+ * in read mode to trigger clock.
+ */
+static void st_i2c_rd_fill_tx_fifo(struct st_i2c_dev *i2c_dev, int max)
+{
+ struct st_i2c_client *c = &i2c_dev->client;
+ u32 tx_fstat, sta;
+ int i;
+
+ sta = readl(i2c_dev->base + SSC_STA);
+ if (sta & SSC_STA_TX_FIFO_FULL)
+ return;
+
+ tx_fstat = readl(i2c_dev->base + SSC_TX_FSTAT) & SSC_TX_FSTAT_STATUS;
+
+ if (max < (SSC_TXFIFO_SIZE - tx_fstat))
+ i = max;
+ else
+ i = SSC_TXFIFO_SIZE - tx_fstat;
+
+ for (; i > 0; i--, c->xfered++)
+ st_i2c_write_tx_fifo(i2c_dev, 0xff);
+}
+
+static void st_i2c_read_rx_fifo(struct st_i2c_dev *i2c_dev)
+{
+ struct st_i2c_client *c = &i2c_dev->client;
+ u32 i, sta;
+ u16 rbuf;
+
+ sta = readl(i2c_dev->base + SSC_STA);
+ if (sta & SSC_STA_RIR) {
+ i = SSC_RXFIFO_SIZE;
+ } else {
+ i = readl(i2c_dev->base + SSC_RX_FSTAT);
+ i &= SSC_RX_FSTAT_STATUS;
+ }
+
+ for (; (i > 0) && (c->count > 0); i--, c->count--) {
+ rbuf = readl(i2c_dev->base + SSC_RBUF) >> 1;
+ *c->buf++ = (u8)rbuf & 0xff;
+ }
+
+ if (i) {
+ dev_err(i2c_dev->dev, "Unexpected %d bytes in rx fifo\n", i);
+ st_i2c_flush_rx_fifo(i2c_dev);
+ }
+}
+
+/**
+ * st_i2c_terminate_xfer() - Send either STOP or REPSTART condition
+ * @i2c_dev: Controller's private data
+ */
+static void st_i2c_terminate_xfer(struct st_i2c_dev *i2c_dev)
+{
+ struct st_i2c_client *c = &i2c_dev->client;
+
+ st_i2c_clr_bits(i2c_dev->base + SSC_IEN, SSC_IEN_TEEN);
+ st_i2c_clr_bits(i2c_dev->base + SSC_I2C, SSC_I2C_STRTG);
+
+ if (c->stop) {
+ st_i2c_set_bits(i2c_dev->base + SSC_IEN, SSC_IEN_STOPEN);
+ st_i2c_set_bits(i2c_dev->base + SSC_I2C, SSC_I2C_STOPG);
+ } else {
+ st_i2c_set_bits(i2c_dev->base + SSC_IEN, SSC_IEN_REPSTRTEN);
+ st_i2c_set_bits(i2c_dev->base + SSC_I2C, SSC_I2C_REPSTRTG);
+ }
+}
+
+/**
+ * st_i2c_handle_write() - Handle FIFO empty interrupt in case of write
+ * @i2c_dev: Controller's private data
+ */
+static void st_i2c_handle_write(struct st_i2c_dev *i2c_dev)
+{
+ struct st_i2c_client *c = &i2c_dev->client;
+
+ st_i2c_flush_rx_fifo(i2c_dev);
+
+ if (!c->count)
+ /* End of xfer, send stop or repstart */
+ st_i2c_terminate_xfer(i2c_dev);
+ else
+ st_i2c_wr_fill_tx_fifo(i2c_dev);
+}
+
+/**
+ * st_i2c_handle_write() - Handle FIFO enmpty interrupt in case of read
+ * @i2c_dev: Controller's private data
+ */
+static void st_i2c_handle_read(struct st_i2c_dev *i2c_dev)
+{
+ struct st_i2c_client *c = &i2c_dev->client;
+ u32 ien;
+
+ /* Trash the address read back */
+ if (!c->xfered) {
+ readl(i2c_dev->base + SSC_RBUF);
+ st_i2c_clr_bits(i2c_dev->base + SSC_I2C, SSC_I2C_TXENB);
+ } else
+ st_i2c_read_rx_fifo(i2c_dev);
+
+ if (!c->count) {
+ /* End of xfer, send stop or repstart */
+ st_i2c_terminate_xfer(i2c_dev);
+ } else if (c->count == 1) {
+ /* Penultimate byte to xfer, disable ACK gen. */
+ st_i2c_clr_bits(i2c_dev->base + SSC_I2C, SSC_I2C_ACKG);
+
+ /* Last received byte is to be handled by NACK interrupt */
+ ien = SSC_IEN_NACKEN | SSC_IEN_ARBLEN;
+ writel(ien, i2c_dev->base + SSC_IEN);
+
+ st_i2c_rd_fill_tx_fifo(i2c_dev, c->count);
+ } else
+ st_i2c_rd_fill_tx_fifo(i2c_dev, c->count - 1);
+}
+
+/**
+ * st_i2c_isr() - Interrupt routine
+ * @irq: interrupt number
+ * @data: Controller's private data
+ */
+static irqreturn_t st_i2c_isr(int irq, void *data)
+{
+ struct st_i2c_dev *i2c_dev = data;
+ struct st_i2c_client *c = &i2c_dev->client;
+ u32 sta, ien, it;
+
+ ien = readl(i2c_dev->base + SSC_IEN);
+ sta = readl(i2c_dev->base + SSC_STA);
+
+ /* Use __fls() to check error bits first */
+ it = __fls(sta & ien);
+
+ switch (1 << it) {
+ case SSC_STA_TE:
+ if (c->addr & I2C_M_RD)
+ st_i2c_handle_read(i2c_dev);
+ else
+ st_i2c_handle_write(i2c_dev);
+ break;
+
+ case SSC_STA_STOP:
+ case SSC_STA_REPSTRT:
+ writel(0, i2c_dev->base + SSC_IEN);
+ complete(&i2c_dev->complete);
+ break;
+
+ case SSC_STA_NACK:
+ writel(SSC_CLR_NACK, i2c_dev->base + SSC_CLR);
+
+ /* Last received byte handled by NACK interrupt */
+ if ((c->addr & I2C_M_RD) && (c->count == 1) && (c->xfered)) {
+ st_i2c_handle_read(i2c_dev);
+ break;
+ }
+
+ it = SSC_IEN_STOPEN | SSC_IEN_ARBLEN;
+ writel(it, i2c_dev->base + SSC_IEN);
+
+ st_i2c_set_bits(i2c_dev->base + SSC_I2C, SSC_I2C_STOPG);
+ c->result = -EIO;
+ break;
+
+ case SSC_STA_ARBL:
+ writel(SSC_CLR_SSCARBL, i2c_dev->base + SSC_CLR);
+
+ it = SSC_IEN_STOPEN | SSC_IEN_ARBLEN;
+ writel(it, i2c_dev->base + SSC_IEN);
+
+ st_i2c_set_bits(i2c_dev->base + SSC_I2C, SSC_I2C_STOPG);
+ c->result = -EIO;
+ break;
+
+ default:
+ dev_err(i2c_dev->dev, "%s: it %d unhandled (status=0x%08x)\n",
+ __func__, it, readl(i2c_dev->base + SSC_STA));
+ }
+
+ return IRQ_HANDLED;
+}
+
+/**
+ * st_i2c_xfer_msg() - Transfer a single I2C message
+ * @i2c_dev: Controller's private data
+ * @msg: I2C message to transfer
+ * @is_first: first message of the sequence
+ * @is_last: last message of the sequence
+ */
+static int st_i2c_xfer_msg(struct st_i2c_dev *i2c_dev, struct i2c_msg *msg,
+ bool is_first, bool is_last)
+{
+ struct st_i2c_client *c = &i2c_dev->client;
+ u32 ctl, i2c, it;
+ unsigned long timeout;
+ int ret;
+
+ c->addr = (u8)(msg->addr << 1);
+ c->addr |= (msg->flags & I2C_M_RD);
+ c->buf = msg->buf;
+ c->count = msg->len;
+ c->xfered = 0;
+ c->result = 0;
+ c->stop = is_last;
+
+ init_completion(&i2c_dev->complete);
+
+ ctl = SSC_CTL_EN | SSC_CTL_MS | SSC_CTL_EN_RX_FIFO | SSC_CTL_EN_TX_FIFO;
+ st_i2c_set_bits(i2c_dev->base + SSC_CTL, ctl);
+
+ i2c = SSC_I2C_TXENB;
+ if (c->addr & I2C_M_RD)
+ i2c |= SSC_I2C_ACKG;
+ st_i2c_set_bits(i2c_dev->base + SSC_I2C, i2c);
+
+ /* Write slave address */
+ st_i2c_write_tx_fifo(i2c_dev, c->addr);
+
+ /* Pre-fill Tx fifo with data in case of write */
+ if (!(c->addr & I2C_M_RD))
+ st_i2c_wr_fill_tx_fifo(i2c_dev);
+
+ it = SSC_IEN_NACKEN | SSC_IEN_TEEN | SSC_IEN_ARBLEN;
+ writel(it, i2c_dev->base + SSC_IEN);
+
+ if (is_first) {
+ ret = st_i2c_wait_free_bus(i2c_dev);
+ if (ret)
+ return ret;
+
+ st_i2c_set_bits(i2c_dev->base + SSC_I2C, SSC_I2C_STRTG);
+ }
+
+ timeout = wait_for_completion_timeout(&i2c_dev->complete,
+ i2c_dev->adap.timeout);
+ ret = c->result;
+
+ if (!timeout) {
+ dev_err(i2c_dev->dev, "Write to slave 0x%x timed out\n",
+ c->addr);
+ ret = -ETIMEDOUT;
+ }
+
+ i2c = SSC_I2C_STOPG | SSC_I2C_REPSTRTG;
+ st_i2c_clr_bits(i2c_dev->base + SSC_I2C, i2c);
+
+ writel(SSC_CLR_SSCSTOP | SSC_CLR_REPSTRT, i2c_dev->base + SSC_CLR);
+
+ return ret;
+}
+
+/**
+ * st_i2c_xfer() - Transfer a single I2C message
+ * @i2c_adap: Adapter pointer to the controller
+ * @msgs: Pointer to data to be written.
+ * @num: Number of messages to be executed
+ */
+static int st_i2c_xfer(struct i2c_adapter *i2c_adap,
+ struct i2c_msg msgs[], int num)
+{
+ struct st_i2c_dev *i2c_dev = i2c_get_adapdata(i2c_adap);
+ bool last, first;
+ int ret, i;
+
+ i2c_dev->busy = true;
+
+ ret = clk_prepare_enable(i2c_dev->clk);
+ if (ret) {
+ dev_err(i2c_dev->dev, "Failed to prepare_enable clock\n");
+ return ret;
+ }
+
+ pinctrl_pm_select_default_state(i2c_dev->dev);
+
+ st_i2c_hw_config(i2c_dev);
+
+ first = true;
+
+ for (i = 0; i < num; i++) {
+ last = (i < num - 1) ? false : true;
+
+ ret = st_i2c_xfer_msg(i2c_dev, &msgs[i], first, last);
+ if (ret)
+ break;
+
+ first = false;
+ }
+
+ pinctrl_pm_select_idle_state(i2c_dev->dev);
+
+ clk_disable_unprepare(i2c_dev->clk);
+
+ i2c_dev->busy = false;
+
+ return (ret < 0) ? ret : i;
+}
+
+#ifdef CONFIG_PM
+static int st_i2c_suspend(struct device *dev)
+{
+ struct platform_device *pdev =
+ container_of(dev, struct platform_device, dev);
+ struct st_i2c_dev *i2c_dev = platform_get_drvdata(pdev);
+
+ if (i2c_dev->busy)
+ return -EBUSY;
+
+ pinctrl_pm_select_sleep_state(dev);
+
+ return 0;
+}
+
+static int st_i2c_resume(struct device *dev)
+{
+ pinctrl_pm_select_default_state(dev);
+ /* Go in idle state if available */
+ pinctrl_pm_select_idle_state(dev);
+
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(st_i2c_pm, st_i2c_suspend, st_i2c_resume);
+#define ST_I2C_PM (&st_i2c_pm)
+#else
+#define ST_I2C_PM NULL
+#endif
+
+static u32 st_i2c_func(struct i2c_adapter *adap)
+{
+ return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static struct i2c_algorithm st_i2c_algo = {
+ .master_xfer = st_i2c_xfer,
+ .functionality = st_i2c_func,
+};
+
+static int st_i2c_of_get_glitches(struct device_node *np,
+ struct st_i2c_dev *i2c_dev)
+{
+ struct st_i2c_glitches *g = &i2c_dev->glitches;
+ int ret;
+
+ g->glitches = of_property_read_bool(np, "st,glitches");
+ if (g->glitches) {
+ ret = of_property_read_u32(np, "st,glitch-clk",
+ &g->glitch_clk);
+ if (ret) {
+ dev_err(i2c_dev->dev, "st,glitch-clk not found\n");
+ return ret;
+ }
+
+ ret = of_property_read_u32(np, "st,glitch-dat",
+ &g->glitch_dat);
+ if (ret) {
+ dev_err(i2c_dev->dev, "st,glitch-dat not found\n");
+ return ret;
+ }
+ }
+
+ g->hw_glitches = of_property_read_bool(np, "st,hw-glitches");
+ if (g->hw_glitches) {
+ ret = of_property_read_u32(np, "st,hw-glitch-clk",
+ &g->hw_glitch_clk);
+ if (ret) {
+ dev_err(i2c_dev->dev, "st,hw-glitch-clk not found\n");
+ return ret;
+ }
+
+ ret = of_property_read_u32(np, "st,hw-glitch-dat",
+ &g->hw_glitch_dat);
+ if (ret) {
+ dev_err(i2c_dev->dev, "st,hw-glitch-dat not found\n");
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static int st_i2c_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct st_i2c_dev *i2c_dev;
+ struct resource *res;
+ u32 clk_rate;
+ struct i2c_adapter *adap;
+ int ret;
+
+ i2c_dev = devm_kzalloc(&pdev->dev, sizeof(*i2c_dev), GFP_KERNEL);
+ if (!i2c_dev)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ i2c_dev->base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(i2c_dev->base))
+ return PTR_ERR(i2c_dev->base);
+
+ i2c_dev->irq = irq_of_parse_and_map(np, 0);
+ if (!i2c_dev->irq) {
+ dev_err(&pdev->dev, "IRQ missing or invalid\n");
+ return -EINVAL;
+ }
+
+ i2c_dev->clk = of_clk_get(np, 0);
+ if (IS_ERR(i2c_dev->clk)) {
+ dev_err(&pdev->dev, "Unable to request clock\n");
+ return PTR_ERR(i2c_dev->clk);
+ }
+
+ i2c_dev->mode = I2C_MODE_STANDARD;
+ ret = of_property_read_u32(np, "clock-frequency", &clk_rate);
+ if ((!ret) && (clk_rate == 400000))
+ i2c_dev->mode = I2C_MODE_FAST;
+
+ i2c_dev->dev = &pdev->dev;
+
+ ret = devm_request_irq(&pdev->dev, i2c_dev->irq, st_i2c_isr, 0,
+ pdev->name, i2c_dev);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to request irq %i\n", i2c_dev->irq);
+ return ret;
+ }
+
+ pinctrl_pm_select_default_state(i2c_dev->dev);
+ /* In case idle state available, select it */
+ pinctrl_pm_select_idle_state(i2c_dev->dev);
+
+ ret = st_i2c_of_get_glitches(np, i2c_dev);
+ if (ret)
+ return ret;
+
+ adap = &i2c_dev->adap;
+ i2c_set_adapdata(adap, i2c_dev);
+ snprintf(adap->name, sizeof(adap->name), "ST I2C(0x%08x)", res->start);
+ adap->owner = THIS_MODULE;
+ adap->timeout = 2 * HZ;
+ adap->retries = 0;
+ adap->class = I2C_CLASS_HWMON | I2C_CLASS_DDC | I2C_CLASS_SPD;
+ adap->algo = &st_i2c_algo;
+ adap->dev.parent = &pdev->dev;
+ adap->dev.of_node = pdev->dev.of_node;
+
+ ret = i2c_add_adapter(adap);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to add adapter\n");
+ return ret;
+ }
+
+ platform_set_drvdata(pdev, i2c_dev);
+
+ dev_info(i2c_dev->dev, "%s initialized\n", adap->name);
+
+ return 0;
+}
+
+static int st_i2c_remove(struct platform_device *pdev)
+{
+ struct st_i2c_dev *i2c_dev = platform_get_drvdata(pdev);
+
+ i2c_del_adapter(&i2c_dev->adap);
+
+ return 0;
+}
+
+static struct of_device_id st_i2c_match[] = {
+ { .compatible = "st,comms-i2c", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, st_i2c_match);
+
+static struct platform_driver st_i2c_driver = {
+ .driver = {
+ .name = DRIVER_NAME,
+ .owner = THIS_MODULE,
+ .of_match_table = st_i2c_match,
+ .pm = &st_i2c_pm,
+ },
+ .probe = st_i2c_probe,
+ .remove = st_i2c_remove,
+};
+
+module_platform_driver(st_i2c_driver);
+
+MODULE_AUTHOR("STMicroelectronics");
+MODULE_DESCRIPTION("STMicroelectronics I2C driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/i2c/busses/i2c-st.h b/drivers/i2c/busses/i2c-st.h
new file mode 100644
index 0000000..7bce6c0
--- /dev/null
+++ b/drivers/i2c/busses/i2c-st.h
@@ -0,0 +1,216 @@
+/*
+ * Copyright (C) 2013 STMicroelectronics
+ *
+ * I2C master mode controller driver, used in STMicroelectronics devices.
+ *
+ * Author: Maxime Coquelin <maxime.coquelin@st.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2, as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __I2C_ST_H_
+#define __I2C_ST_H_
+
+/* SSC registers */
+#define SSC_BRG 0x000
+#define SSC_TBUF 0x004
+#define SSC_RBUF 0x008
+#define SSC_CTL 0x00C
+#define SSC_IEN 0x010
+#define SSC_STA 0x014
+#define SSC_I2C 0x018
+#define SSC_SLAD 0x01C
+#define SSC_REP_START_HOLD 0x020
+#define SSC_START_HOLD 0x024
+#define SSC_REP_START_SETUP 0x028
+#define SSC_DATA_SETUP 0x02C
+#define SSC_STOP_SETUP 0x030
+#define SSC_BUS_FREE 0x034
+#define SSC_TX_FSTAT 0x038
+#define SSC_RX_FSTAT 0x03C
+#define SSC_PRE_SCALER_BRG 0x040
+#define SSC_CLR 0x080
+#define SSC_NOISE_SUPP_WIDTH 0x100
+#define SSC_PRSCALER 0x104
+#define SSC_NOISE_SUPP_WIDTH_DATAOUT 0x108
+#define SSC_PRSCALER_DATAOUT 0x10c
+
+/* SSC Control */
+#define SSC_CTL_DATA_WIDTH_9 0x8
+#define SSC_CTL_DATA_WIDTH_MSK 0xf
+#define SSC_CTL_BM 0xf
+#define SSC_CTL_HB BIT(4)
+#define SSC_CTL_PH BIT(5)
+#define SSC_CTL_PO BIT(6)
+#define SSC_CTL_SR BIT(7)
+#define SSC_CTL_MS BIT(8)
+#define SSC_CTL_EN BIT(9)
+#define SSC_CTL_LPB BIT(10)
+#define SSC_CTL_EN_TX_FIFO BIT(11)
+#define SSC_CTL_EN_RX_FIFO BIT(12)
+#define SSC_CTL_EN_CLST_RX BIT(13)
+
+/* SSC Interrupt Enable */
+#define SSC_IEN_RIEN BIT(0)
+#define SSC_IEN_TIEN BIT(1)
+#define SSC_IEN_TEEN BIT(2)
+#define SSC_IEN_REEN BIT(3)
+#define SSC_IEN_PEEN BIT(4)
+#define SSC_IEN_AASEN BIT(6)
+#define SSC_IEN_STOPEN BIT(7)
+#define SSC_IEN_ARBLEN BIT(8)
+#define SSC_IEN_NACKEN BIT(10)
+#define SSC_IEN_REPSTRTEN BIT(11)
+#define SSC_IEN_TX_FIFO_HALF BIT(12)
+#define SSC_IEN_RX_FIFO_HALF_FULL BIT(14)
+
+/* SSC Status */
+#define SSC_STA_RIR BIT(0)
+#define SSC_STA_TIR BIT(1)
+#define SSC_STA_TE BIT(2)
+#define SSC_STA_RE BIT(3)
+#define SSC_STA_PE BIT(4)
+#define SSC_STA_CLST BIT(5)
+#define SSC_STA_AAS BIT(6)
+#define SSC_STA_STOP BIT(7)
+#define SSC_STA_ARBL BIT(8)
+#define SSC_STA_BUSY BIT(9)
+#define SSC_STA_NACK BIT(10)
+#define SSC_STA_REPSTRT BIT(11)
+#define SSC_STA_TX_FIFO_HALF BIT(12)
+#define SSC_STA_TX_FIFO_FULL BIT(13)
+#define SSC_STA_RX_FIFO_HALF BIT(14)
+
+/* SSC I2C Control */
+#define SSC_I2C_I2CM BIT(0)
+#define SSC_I2C_STRTG BIT(1)
+#define SSC_I2C_STOPG BIT(2)
+#define SSC_I2C_ACKG BIT(3)
+#define SSC_I2C_AD10 BIT(4)
+#define SSC_I2C_TXENB BIT(5)
+#define SSC_I2C_REPSTRTG BIT(11)
+#define SSC_I2C_SLAVE_DISABLE BIT(12)
+
+/* SSC Tx FIFO Status */
+#define SSC_TX_FSTAT_STATUS 0x07
+
+/* SSC Rx FIFO Status */
+#define SSC_RX_FSTAT_STATUS 0x07
+
+/* SSC Clear bit operation */
+#define SSC_CLR_SSCAAS BIT(6)
+#define SSC_CLR_SSCSTOP BIT(7)
+#define SSC_CLR_SSCARBL BIT(8)
+#define SSC_CLR_NACK BIT(10)
+#define SSC_CLR_REPSTRT BIT(11)
+
+/* SSC Clock Prescaler */
+#define SSC_PRSC_VALUE 0x0f
+
+
+#define SSC_TXFIFO_SIZE 0x8
+#define SSC_RXFIFO_SIZE 0x8
+
+enum st_i2c_mode {
+ I2C_MODE_STANDARD,
+ I2C_MODE_FAST,
+ I2C_MODE_END,
+};
+
+/**
+ * struct st_i2c_timings - per-Mode tuning parameters
+ * @rate: I2C bus rate
+ * @rep_start_hold: I2C repeated start hold time requirement
+ * @rep_start_setup: I2C repeated start set up time requirement
+ * @start_hold: I2C start hold time requirement
+ * @data_setup_time: I2C data set up time requirement
+ * @stop_setup_time: I2C stop set up time requirement
+ * @bus_free_time: I2C bus free time requirement
+ * @glitch_dat_max: I2C data glitch max time
+ */
+struct st_i2c_timings {
+ u32 rate;
+ u32 rep_start_hold;
+ u32 rep_start_setup;
+ u32 start_hold;
+ u32 data_setup_time;
+ u32 stop_setup_time;
+ u32 bus_free_time;
+ u32 glitch_dat_max;
+};
+
+/**
+ * struct st_i2c_glitches - per-SoC tuning parameters
+ * @glitches: Glitches are defined for this SoC
+ * @glitch_clk: Clk line glitch tuning value
+ * @glitch_dat: Data line glitch tuning value
+ * @hw_glitches: HW glitches are defined for this SoC
+ * @hw_glitch_clk: Clk line hw glitch value
+ * @hw_glitch_dat: Data line hw glitch value
+ */
+struct st_i2c_glitches {
+ bool glitches;
+ u32 glitch_clk;
+ u32 glitch_dat;
+ bool hw_glitches;
+ u32 hw_glitch_clk;
+ u32 hw_glitch_dat;
+};
+
+/**
+ * struct st_i2c_client - client specific data
+ * @addr: 8-bit slave addr, including r/w bit
+ * @count: number of bytes to be transfered
+ * @xfered: number of bytes already transferred
+ * @buf: data buffer
+ * @result: result of the transfer
+ * @stop: last I2C msg to be sent, i.e. STOP to be generated
+ */
+struct st_i2c_client {
+ u8 addr;
+ u32 count;
+ u32 xfered;
+ u8 *buf;
+ int result;
+ bool stop;
+};
+
+/**
+ * struct st_i2c_dev - private data of the controller
+ * @adap: I2C adapter for this controller
+ * @dev: device for this controller
+ * @base: virtual memory area
+ * @complete: completion of I2C message
+ * @irq: interrupt line for th controller
+ * @clk: hw ssc block clock
+ * @mode: I2C mode of the controller. Standard or Fast only supported
+ * @glitches: Glitch filters tuning parameters
+ * @client: I2C transfert information
+ * @busy: I2C transfer on-going
+ */
+struct st_i2c_dev {
+ struct i2c_adapter adap;
+ struct device *dev;
+ void __iomem *base;
+ struct completion complete;
+ int irq;
+ struct clk *clk;
+ int mode;
+ struct st_i2c_glitches glitches;
+ struct st_i2c_client client;
+ bool busy;
+};
+
+static inline void st_i2c_set_bits(void __iomem *reg, u32 mask)
+{
+ writel(readl(reg) | mask, reg);
+}
+
+static inline void st_i2c_clr_bits(void __iomem *reg, u32 mask)
+{
+ writel(readl(reg) & ~mask, reg);
+}
+
+#endif /* __I2C_ST_H_ */
--
1.7.9.5
^ permalink raw reply related [flat|nested] 17+ messages in thread
* Re: [PATCH 1/4] i2c: busses: i2c-st: Add ST I2C controller
2013-09-18 10:01 ` [PATCH 1/4] i2c: busses: i2c-st: Add ST I2C controller Maxime COQUELIN
@ 2013-09-18 12:47 ` Gabriel FERNANDEZ
[not found] ` <5239A0ED.6010606-qxv4g6HH51o@public.gmane.org>
[not found] ` <1379498483-4236-2-git-send-email-maxime.coquelin-qxv4g6HH51o@public.gmane.org>
1 sibling, 1 reply; 17+ messages in thread
From: Gabriel FERNANDEZ @ 2013-09-18 12:47 UTC (permalink / raw)
To: Maxime COQUELIN
Cc: Mark Rutland, devicetree@vger.kernel.org, Ian Campbell,
Russell King, Pawel Moll, Srinivas KANDAGATLA, Wolfram Sang,
Stephen Warren, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org, Rob Herring, Stephen GALLIMORE,
Stuart MENEFY, linux-i2c@vger.kernel.org, Rob Landley,
Grant Likely, Olivier CLERGEAUD, Lee Jones,
linux-arm-kernel@lists.infradead.org
On 18/09/2013 12:01, Maxime COQUELIN wrote:
> This patch adds support to SSC (Synchronous Serial Controller)
> I2C driver. This IP also supports SPI protocol, but this is not
> the aim of this driver.
>
> This IP is embedded in all ST SoCs for Set-top box platorms, and
> supports I2C Standard and Fast modes.
>
> Cc: Srinivas Kandagatla <srinivas.kandagatla@st.com>
> Signed-off-by: Maxime Coquelin <maxime.coquelin@st.com>
> ---
> Documentation/devicetree/bindings/i2c/i2c-st.txt | 35 ++
> drivers/i2c/busses/Kconfig | 10 +
> drivers/i2c/busses/Makefile | 1 +
> drivers/i2c/busses/i2c-st.c | 713 ++++++++++++++++++++++
> drivers/i2c/busses/i2c-st.h | 216 +++++++
> 5 files changed, 975 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/i2c/i2c-st.txt
> create mode 100644 drivers/i2c/busses/i2c-st.c
> create mode 100644 drivers/i2c/busses/i2c-st.h
>
> diff --git a/Documentation/devicetree/bindings/i2c/i2c-st.txt b/Documentation/devicetree/bindings/i2c/i2c-st.txt
> new file mode 100644
> index 0000000..a7d6381
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/i2c/i2c-st.txt
> @@ -0,0 +1,35 @@
> +I2C for ST platforms
> +
> +Required properties :
> +- compatible : Must be "st,comms-i2c"
> +- reg : Offset and length of the register set for the device
> +- interrupts : the interrupt number
> +- clocks : phandle to the I2C clock source
> +
> +Recommended (non-standard) properties :
> +- clock-frequency : Desired I2C bus clock frequency in Hz. Otherwise
> + the default 100 kHz frequency will be used. As only Normal and Fast modes
> + are supported, possible values are 100000 and 400000.
> +
> +Optional (non-standard) properties:
> +- st,glitches : Enable timing glitch suppression support.
> +- st,glitch-clk : SCL line timinig glitch suppression value in ns.
> +- st,glitch-dat : SDA line timinig glitch suppression value in ns.
> +- st,hw-glitches : Enable filter glitch suppression support.
> +- st,hw-glitch-clk : SCL line filter glitch suppression value in us.
> +- st,hw-glitch-dat : SDA line filter glitch suppression value in us.
> +
> +Examples :
> +
> +i2c0: i2c@fed40000{
Space before the '{'
> + compatible = "st,comms-i2c";
> + reg = <0xfed40000 0x110>;
> + interrupts = <GIC_SPI 187 IRQ_TYPE_EDGE_RISING>;
> + clocks = <&CLK_S_ICN_REG_0>;
> + clock-frequency = <400000>;
> + pinctrl-names = "default";
> + pinctrl-0 = <&pinctrl_i2c0_default>;
> + st,glitches;
> + st,glitch-clk = 500;
> + st,glitch-dat = 500;
> +};
> diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
> index cdcbd83..18ff129 100644
> --- a/drivers/i2c/busses/Kconfig
> +++ b/drivers/i2c/busses/Kconfig
> @@ -776,6 +776,16 @@ config I2C_RCAR
> This driver can also be built as a module. If so, the module
> will be called i2c-rcar.
>
> +config I2C_ST
> + tristate "STMicroelectronics SSC I2C support"
> + depends on ARCH_STI
> + help
> + Enable this option to add support for STMicroelectronics SoCs
> + hardware SSC (Synchronous Serial Controller) as an I2C controller.
> +
> + This driver can also be built as module. If so, the module
> + will be called i2c-st.
> +
> comment "External I2C/SMBus adapter drivers"
>
> config I2C_DIOLAN_U2C
> diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
> index d00997f..9ea5d422 100644
> --- a/drivers/i2c/busses/Makefile
> +++ b/drivers/i2c/busses/Makefile
> @@ -92,5 +92,6 @@ obj-$(CONFIG_I2C_PCA_ISA) += i2c-pca-isa.o
> obj-$(CONFIG_I2C_SIBYTE) += i2c-sibyte.o
> obj-$(CONFIG_SCx200_ACB) += scx200_acb.o
> obj-$(CONFIG_SCx200_I2C) += scx200_i2c.o
> +obj-$(CONFIG_I2C_ST) += i2c-st.o
>
> ccflags-$(CONFIG_I2C_DEBUG_BUS) := -DDEBUG
> diff --git a/drivers/i2c/busses/i2c-st.c b/drivers/i2c/busses/i2c-st.c
> new file mode 100644
> index 0000000..fa4451f
> --- /dev/null
> +++ b/drivers/i2c/busses/i2c-st.c
> @@ -0,0 +1,713 @@
> +/*
> + * Copyright (C) 2013 STMicroelectronics
> + *
> + * I2C master mode controller driver, used in STMicroelectronics devices.
> + *
> + * Author: Maxime Coquelin <maxime.coquelin@st.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2, as
> + * published by the Free Software Foundation.
> + */
> +
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/i2c.h>
> +#include <linux/clk.h>
> +#include <linux/io.h>
> +#include <linux/delay.h>
> +#include <linux/interrupt.h>
> +#include <linux/err.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/of_irq.h>
> +#include "i2c-st.h"
> +
> +#define DRIVER_NAME "st-i2c"
> +
> +static struct st_i2c_timings i2c_timings[] = {
> + [I2C_MODE_STANDARD] = {
> + .rate = 100000,
> + .rep_start_hold = 4000,
> + .rep_start_setup = 4700,
> + .start_hold = 4000,
> + .data_setup_time = 250,
> + .stop_setup_time = 4000,
> + .bus_free_time = 4700,
> + .glitch_dat_max = 1200,
> + },
> + [I2C_MODE_FAST] = {
> + .rate = 400000,
> + .rep_start_hold = 600,
> + .rep_start_setup = 600,
> + .start_hold = 1000,
> + .data_setup_time = 500,
> + .stop_setup_time = 900,
> + .bus_free_time = 1300,
> + .glitch_dat_max = 200,
> + },
> +};
> +
> +static void st_i2c_flush_rx_fifo(struct st_i2c_dev *i2c_dev)
> +{
> + int count, i;
> +
> + /*
> + * Counter only counts up to 7 but fifo size is 8...
> + * When fifo is full, counter is 0 and RIR bit of status register is
> + * set
> + */
> + if (readl(i2c_dev->base + SSC_STA) & SSC_STA_RIR)
> + count = SSC_RXFIFO_SIZE;
> + else
> + count = readl(i2c_dev->base + SSC_RX_FSTAT) &
> + SSC_RX_FSTAT_STATUS;
> +
> + for (i = 0; i < count; i++)
> + readl(i2c_dev->base + SSC_RBUF);
> +}
> +
> +static void st_i2c_soft_reset(struct st_i2c_dev *i2c_dev)
> +{
> + /*
> + * FIFO needs to be emptied before reseting the IP,
> + * else the controller raises a BUSY error.
> + */
> + st_i2c_flush_rx_fifo(i2c_dev);
> +
> + st_i2c_set_bits(i2c_dev->base + SSC_CTL, SSC_CTL_SR);
> + st_i2c_clr_bits(i2c_dev->base + SSC_CTL, SSC_CTL_SR);
> +}
> +
> +/**
> + * st_i2c_hw_config() - Prepare SSC block, calculate and apply tuning timings
> + * @i2c_dev: Controller's private data
> + */
> +static void st_i2c_hw_config(struct st_i2c_dev *i2c_dev)
> +{
> + unsigned long rate;
> + u32 val, ns_per_clk;
> + struct st_i2c_timings *t = &i2c_timings[i2c_dev->mode];
> + struct st_i2c_glitches *g = &i2c_dev->glitches;
> +
> + st_i2c_soft_reset(i2c_dev);
> +
> + val = SSC_CLR_REPSTRT | SSC_CLR_NACK | SSC_CLR_SSCARBL |
> + SSC_CLR_SSCAAS | SSC_CLR_SSCSTOP;
> + writel(val, i2c_dev->base + SSC_CLR);
> +
> + /* SSC Control register setup */
> + val = SSC_CTL_PO | SSC_CTL_PH | SSC_CTL_HB | SSC_CTL_DATA_WIDTH_9;
> + writel(val, i2c_dev->base + SSC_CTL);
> +
> + rate = clk_get_rate(i2c_dev->clk);
> + ns_per_clk = 1000000000 / rate;
> +
> + /* Baudrate */
> + val = rate / (2 * t->rate);
> + writel(val, i2c_dev->base + SSC_BRG);
> +
> + /* Pre-scaler baudrate */
> + writel(1, i2c_dev->base + SSC_PRE_SCALER_BRG);
> +
> + /* Enable I2C mode */
> + writel(SSC_I2C_I2CM, i2c_dev->base + SSC_I2C);
> +
> + /* Repeated start hold time */
> + val = (t->rep_start_hold + g->glitch_dat) / ns_per_clk;
> + writel(val, i2c_dev->base + SSC_REP_START_HOLD);
> +
> + /* Repeated start set up time */
> + val = (t->rep_start_setup + g->glitch_clk) / ns_per_clk;
> + writel(val, i2c_dev->base + SSC_REP_START_SETUP);
> +
> + /* Start hold time */
> + if (g->glitch_dat < t->glitch_dat_max)
> + val = (t->start_hold + g->glitch_dat) / ns_per_clk;
> + else
> + val = (t->start_hold + t->glitch_dat_max) / ns_per_clk;
> + writel(val, i2c_dev->base + SSC_START_HOLD);
> +
> + /* Data set up time */
> + val = (t->data_setup_time + g->glitch_dat) / ns_per_clk;
> + writel(val, i2c_dev->base + SSC_DATA_SETUP);
> +
> + /* Stop set up time */
> + val = (t->stop_setup_time + g->glitch_clk) / ns_per_clk;
> + writel(val, i2c_dev->base + SSC_STOP_SETUP);
> +
> + /* Bus free time */
> + val = (t->bus_free_time + g->glitch_dat) / ns_per_clk;
> + writel(val, i2c_dev->base + SSC_BUS_FREE);
> +
> + if (!g->hw_glitches) {
> + writel(0, i2c_dev->base + SSC_NOISE_SUPP_WIDTH);
> + return;
> + }
> +
> + /* Prescalers set up */
> + val = rate / 10000000;
> + writel(val, i2c_dev->base + SSC_PRSCALER);
> + writel(val, i2c_dev->base + SSC_PRSCALER_DATAOUT);
> +
> + /* Noise suppression witdh */
> + val = g->hw_glitch_clk * rate / 100000000;
> + writel(val, i2c_dev->base + SSC_NOISE_SUPP_WIDTH);
> +
> + /* Noise suppression max output data delay width */
> + val = g->hw_glitch_dat * rate / 100000000;
> + writel(val, i2c_dev->base + SSC_NOISE_SUPP_WIDTH_DATAOUT);
> +
> + return;
> +}
> +
> +static int st_i2c_wait_free_bus(struct st_i2c_dev *i2c_dev)
> +{
> + u32 sta;
> + int i;
> +
> + for (i = 0; i < 10; i++) {
> + sta = readl(i2c_dev->base + SSC_STA);
> + if (!(sta & SSC_STA_BUSY))
> + return 0;
> +
> + usleep_range(2000, 4000);
> + }
> +
> + dev_err(i2c_dev->dev, "bus not free (status = 0x%08x)\n", sta);
> +
> + return -EBUSY;
> +}
> +
> +/**
> + * st_i2c_write_tx_fifo() - Write a byte in the Tx FIFO
> + * @i2c_dev: Controller's private data
> + * @byte: Data to write in the Tx FIFO
> + */
> +static inline void st_i2c_write_tx_fifo(struct st_i2c_dev *i2c_dev, u8 byte)
> +{
> + u16 tbuf = byte << 1;
> +
> + writel(tbuf | 1, i2c_dev->base + SSC_TBUF);
> +}
> +
> +/**
> + * st_i2c_wr_fill_tx_fifo() - Fill the Tx FIFO in write mode
> + * @i2c_dev: Controller's private data
> + *
> + * This functions fills the Tx FIFO with I2C transfert buffer when
> + * in write mode.
> + */
> +static void st_i2c_wr_fill_tx_fifo(struct st_i2c_dev *i2c_dev)
> +{
> + struct st_i2c_client *c = &i2c_dev->client;
> + u32 tx_fstat, sta;
> + int i;
> +
> + sta = readl(i2c_dev->base + SSC_STA);
> + if (sta & SSC_STA_TX_FIFO_FULL)
> + return;
> +
> + tx_fstat = readl(i2c_dev->base + SSC_TX_FSTAT) & SSC_TX_FSTAT_STATUS;
> +
> + if (c->count < (SSC_TXFIFO_SIZE - tx_fstat))
> + i = c->count;
> + else
> + i = SSC_TXFIFO_SIZE - tx_fstat;
> +
> + for (; i > 0; i--, c->count--, c->buf++)
> + st_i2c_write_tx_fifo(i2c_dev, *c->buf);
> +}
> +
> +/**
> + * st_i2c_rd_fill_tx_fifo() - Fill the Tx FIFO in read mode
> + * @i2c_dev: Controller's private data
> + *
> + * This functions fills the Tx FIFO with fixed pattern when
> + * in read mode to trigger clock.
> + */
> +static void st_i2c_rd_fill_tx_fifo(struct st_i2c_dev *i2c_dev, int max)
> +{
> + struct st_i2c_client *c = &i2c_dev->client;
> + u32 tx_fstat, sta;
> + int i;
> +
> + sta = readl(i2c_dev->base + SSC_STA);
> + if (sta & SSC_STA_TX_FIFO_FULL)
> + return;
> +
> + tx_fstat = readl(i2c_dev->base + SSC_TX_FSTAT) & SSC_TX_FSTAT_STATUS;
> +
> + if (max < (SSC_TXFIFO_SIZE - tx_fstat))
> + i = max;
> + else
> + i = SSC_TXFIFO_SIZE - tx_fstat;
> +
> + for (; i > 0; i--, c->xfered++)
> + st_i2c_write_tx_fifo(i2c_dev, 0xff);
> +}
> +
> +static void st_i2c_read_rx_fifo(struct st_i2c_dev *i2c_dev)
> +{
> + struct st_i2c_client *c = &i2c_dev->client;
> + u32 i, sta;
> + u16 rbuf;
> +
> + sta = readl(i2c_dev->base + SSC_STA);
> + if (sta & SSC_STA_RIR) {
> + i = SSC_RXFIFO_SIZE;
> + } else {
> + i = readl(i2c_dev->base + SSC_RX_FSTAT);
> + i &= SSC_RX_FSTAT_STATUS;
> + }
> +
> + for (; (i > 0) && (c->count > 0); i--, c->count--) {
> + rbuf = readl(i2c_dev->base + SSC_RBUF) >> 1;
> + *c->buf++ = (u8)rbuf & 0xff;
> + }
> +
> + if (i) {
> + dev_err(i2c_dev->dev, "Unexpected %d bytes in rx fifo\n", i);
> + st_i2c_flush_rx_fifo(i2c_dev);
> + }
> +}
> +
> +/**
> + * st_i2c_terminate_xfer() - Send either STOP or REPSTART condition
> + * @i2c_dev: Controller's private data
> + */
> +static void st_i2c_terminate_xfer(struct st_i2c_dev *i2c_dev)
> +{
> + struct st_i2c_client *c = &i2c_dev->client;
> +
> + st_i2c_clr_bits(i2c_dev->base + SSC_IEN, SSC_IEN_TEEN);
> + st_i2c_clr_bits(i2c_dev->base + SSC_I2C, SSC_I2C_STRTG);
> +
> + if (c->stop) {
> + st_i2c_set_bits(i2c_dev->base + SSC_IEN, SSC_IEN_STOPEN);
> + st_i2c_set_bits(i2c_dev->base + SSC_I2C, SSC_I2C_STOPG);
> + } else {
> + st_i2c_set_bits(i2c_dev->base + SSC_IEN, SSC_IEN_REPSTRTEN);
> + st_i2c_set_bits(i2c_dev->base + SSC_I2C, SSC_I2C_REPSTRTG);
> + }
> +}
> +
> +/**
> + * st_i2c_handle_write() - Handle FIFO empty interrupt in case of write
> + * @i2c_dev: Controller's private data
> + */
> +static void st_i2c_handle_write(struct st_i2c_dev *i2c_dev)
> +{
> + struct st_i2c_client *c = &i2c_dev->client;
> +
> + st_i2c_flush_rx_fifo(i2c_dev);
> +
> + if (!c->count)
> + /* End of xfer, send stop or repstart */
> + st_i2c_terminate_xfer(i2c_dev);
> + else
> + st_i2c_wr_fill_tx_fifo(i2c_dev);
> +}
> +
> +/**
> + * st_i2c_handle_write() - Handle FIFO enmpty interrupt in case of read
> + * @i2c_dev: Controller's private data
> + */
> +static void st_i2c_handle_read(struct st_i2c_dev *i2c_dev)
> +{
> + struct st_i2c_client *c = &i2c_dev->client;
> + u32 ien;
> +
> + /* Trash the address read back */
> + if (!c->xfered) {
> + readl(i2c_dev->base + SSC_RBUF);
> + st_i2c_clr_bits(i2c_dev->base + SSC_I2C, SSC_I2C_TXENB);
> + } else
> + st_i2c_read_rx_fifo(i2c_dev);
> +
> + if (!c->count) {
> + /* End of xfer, send stop or repstart */
> + st_i2c_terminate_xfer(i2c_dev);
> + } else if (c->count == 1) {
> + /* Penultimate byte to xfer, disable ACK gen. */
> + st_i2c_clr_bits(i2c_dev->base + SSC_I2C, SSC_I2C_ACKG);
> +
> + /* Last received byte is to be handled by NACK interrupt */
> + ien = SSC_IEN_NACKEN | SSC_IEN_ARBLEN;
> + writel(ien, i2c_dev->base + SSC_IEN);
> +
> + st_i2c_rd_fill_tx_fifo(i2c_dev, c->count);
> + } else
> + st_i2c_rd_fill_tx_fifo(i2c_dev, c->count - 1);
> +}
> +
> +/**
> + * st_i2c_isr() - Interrupt routine
> + * @irq: interrupt number
> + * @data: Controller's private data
> + */
> +static irqreturn_t st_i2c_isr(int irq, void *data)
> +{
> + struct st_i2c_dev *i2c_dev = data;
> + struct st_i2c_client *c = &i2c_dev->client;
> + u32 sta, ien, it;
> +
> + ien = readl(i2c_dev->base + SSC_IEN);
> + sta = readl(i2c_dev->base + SSC_STA);
> +
> + /* Use __fls() to check error bits first */
> + it = __fls(sta & ien);
> +
> + switch (1 << it) {
> + case SSC_STA_TE:
> + if (c->addr & I2C_M_RD)
> + st_i2c_handle_read(i2c_dev);
> + else
> + st_i2c_handle_write(i2c_dev);
> + break;
> +
> + case SSC_STA_STOP:
> + case SSC_STA_REPSTRT:
> + writel(0, i2c_dev->base + SSC_IEN);
> + complete(&i2c_dev->complete);
> + break;
> +
> + case SSC_STA_NACK:
> + writel(SSC_CLR_NACK, i2c_dev->base + SSC_CLR);
> +
> + /* Last received byte handled by NACK interrupt */
> + if ((c->addr & I2C_M_RD) && (c->count == 1) && (c->xfered)) {
> + st_i2c_handle_read(i2c_dev);
> + break;
> + }
> +
> + it = SSC_IEN_STOPEN | SSC_IEN_ARBLEN;
> + writel(it, i2c_dev->base + SSC_IEN);
> +
> + st_i2c_set_bits(i2c_dev->base + SSC_I2C, SSC_I2C_STOPG);
> + c->result = -EIO;
> + break;
> +
> + case SSC_STA_ARBL:
> + writel(SSC_CLR_SSCARBL, i2c_dev->base + SSC_CLR);
> +
> + it = SSC_IEN_STOPEN | SSC_IEN_ARBLEN;
> + writel(it, i2c_dev->base + SSC_IEN);
> +
> + st_i2c_set_bits(i2c_dev->base + SSC_I2C, SSC_I2C_STOPG);
> + c->result = -EIO;
> + break;
> +
> + default:
> + dev_err(i2c_dev->dev, "%s: it %d unhandled (status=0x%08x)\n",
> + __func__, it, readl(i2c_dev->base + SSC_STA));
> + }
> +
> + return IRQ_HANDLED;
> +}
> +
> +/**
> + * st_i2c_xfer_msg() - Transfer a single I2C message
> + * @i2c_dev: Controller's private data
> + * @msg: I2C message to transfer
> + * @is_first: first message of the sequence
> + * @is_last: last message of the sequence
> + */
> +static int st_i2c_xfer_msg(struct st_i2c_dev *i2c_dev, struct i2c_msg *msg,
> + bool is_first, bool is_last)
> +{
> + struct st_i2c_client *c = &i2c_dev->client;
> + u32 ctl, i2c, it;
> + unsigned long timeout;
> + int ret;
> +
> + c->addr = (u8)(msg->addr << 1);
> + c->addr |= (msg->flags & I2C_M_RD);
> + c->buf = msg->buf;
> + c->count = msg->len;
> + c->xfered = 0;
> + c->result = 0;
> + c->stop = is_last;
> +
> + init_completion(&i2c_dev->complete);
> +
> + ctl = SSC_CTL_EN | SSC_CTL_MS | SSC_CTL_EN_RX_FIFO | SSC_CTL_EN_TX_FIFO;
> + st_i2c_set_bits(i2c_dev->base + SSC_CTL, ctl);
> +
> + i2c = SSC_I2C_TXENB;
> + if (c->addr & I2C_M_RD)
> + i2c |= SSC_I2C_ACKG;
> + st_i2c_set_bits(i2c_dev->base + SSC_I2C, i2c);
> +
> + /* Write slave address */
> + st_i2c_write_tx_fifo(i2c_dev, c->addr);
> +
> + /* Pre-fill Tx fifo with data in case of write */
> + if (!(c->addr & I2C_M_RD))
> + st_i2c_wr_fill_tx_fifo(i2c_dev);
> +
> + it = SSC_IEN_NACKEN | SSC_IEN_TEEN | SSC_IEN_ARBLEN;
> + writel(it, i2c_dev->base + SSC_IEN);
> +
> + if (is_first) {
> + ret = st_i2c_wait_free_bus(i2c_dev);
> + if (ret)
> + return ret;
> +
> + st_i2c_set_bits(i2c_dev->base + SSC_I2C, SSC_I2C_STRTG);
> + }
> +
> + timeout = wait_for_completion_timeout(&i2c_dev->complete,
> + i2c_dev->adap.timeout);
> + ret = c->result;
> +
> + if (!timeout) {
> + dev_err(i2c_dev->dev, "Write to slave 0x%x timed out\n",
> + c->addr);
> + ret = -ETIMEDOUT;
> + }
> +
> + i2c = SSC_I2C_STOPG | SSC_I2C_REPSTRTG;
> + st_i2c_clr_bits(i2c_dev->base + SSC_I2C, i2c);
> +
> + writel(SSC_CLR_SSCSTOP | SSC_CLR_REPSTRT, i2c_dev->base + SSC_CLR);
> +
> + return ret;
> +}
> +
> +/**
> + * st_i2c_xfer() - Transfer a single I2C message
> + * @i2c_adap: Adapter pointer to the controller
> + * @msgs: Pointer to data to be written.
> + * @num: Number of messages to be executed
> + */
> +static int st_i2c_xfer(struct i2c_adapter *i2c_adap,
> + struct i2c_msg msgs[], int num)
> +{
> + struct st_i2c_dev *i2c_dev = i2c_get_adapdata(i2c_adap);
> + bool last, first;
> + int ret, i;
> +
> + i2c_dev->busy = true;
> +
> + ret = clk_prepare_enable(i2c_dev->clk);
> + if (ret) {
> + dev_err(i2c_dev->dev, "Failed to prepare_enable clock\n");
> + return ret;
> + }
> +
> + pinctrl_pm_select_default_state(i2c_dev->dev);
> +
> + st_i2c_hw_config(i2c_dev);
> +
> + first = true;
> +
> + for (i = 0; i < num; i++) {
> + last = (i < num - 1) ? false : true;
> +
> + ret = st_i2c_xfer_msg(i2c_dev, &msgs[i], first, last);
> + if (ret)
> + break;
> +
> + first = false;
> + }
> +
> + pinctrl_pm_select_idle_state(i2c_dev->dev);
> +
> + clk_disable_unprepare(i2c_dev->clk);
> +
> + i2c_dev->busy = false;
> +
> + return (ret < 0) ? ret : i;
> +}
> +
> +#ifdef CONFIG_PM
> +static int st_i2c_suspend(struct device *dev)
> +{
> + struct platform_device *pdev =
> + container_of(dev, struct platform_device, dev);
> + struct st_i2c_dev *i2c_dev = platform_get_drvdata(pdev);
> +
> + if (i2c_dev->busy)
> + return -EBUSY;
> +
> + pinctrl_pm_select_sleep_state(dev);
> +
> + return 0;
> +}
> +
> +static int st_i2c_resume(struct device *dev)
> +{
> + pinctrl_pm_select_default_state(dev);
> + /* Go in idle state if available */
> + pinctrl_pm_select_idle_state(dev);
> +
> + return 0;
> +}
> +
> +static SIMPLE_DEV_PM_OPS(st_i2c_pm, st_i2c_suspend, st_i2c_resume);
> +#define ST_I2C_PM (&st_i2c_pm)
> +#else
> +#define ST_I2C_PM NULL
> +#endif
> +
> +static u32 st_i2c_func(struct i2c_adapter *adap)
> +{
> + return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
> +}
> +
> +static struct i2c_algorithm st_i2c_algo = {
> + .master_xfer = st_i2c_xfer,
> + .functionality = st_i2c_func,
> +};
> +
> +static int st_i2c_of_get_glitches(struct device_node *np,
> + struct st_i2c_dev *i2c_dev)
> +{
> + struct st_i2c_glitches *g = &i2c_dev->glitches;
> + int ret;
> +
> + g->glitches = of_property_read_bool(np, "st,glitches");
> + if (g->glitches) {
> + ret = of_property_read_u32(np, "st,glitch-clk",
> + &g->glitch_clk);
> + if (ret) {
> + dev_err(i2c_dev->dev, "st,glitch-clk not found\n");
> + return ret;
> + }
> +
> + ret = of_property_read_u32(np, "st,glitch-dat",
> + &g->glitch_dat);
> + if (ret) {
> + dev_err(i2c_dev->dev, "st,glitch-dat not found\n");
> + return ret;
> + }
> + }
> +
> + g->hw_glitches = of_property_read_bool(np, "st,hw-glitches");
> + if (g->hw_glitches) {
> + ret = of_property_read_u32(np, "st,hw-glitch-clk",
> + &g->hw_glitch_clk);
> + if (ret) {
> + dev_err(i2c_dev->dev, "st,hw-glitch-clk not found\n");
> + return ret;
> + }
> +
> + ret = of_property_read_u32(np, "st,hw-glitch-dat",
> + &g->hw_glitch_dat);
> + if (ret) {
> + dev_err(i2c_dev->dev, "st,hw-glitch-dat not found\n");
> + return ret;
> + }
> + }
> +
> + return 0;
> +}
> +
> +static int st_i2c_probe(struct platform_device *pdev)
> +{
> + struct device_node *np = pdev->dev.of_node;
> + struct st_i2c_dev *i2c_dev;
> + struct resource *res;
> + u32 clk_rate;
> + struct i2c_adapter *adap;
> + int ret;
> +
> + i2c_dev = devm_kzalloc(&pdev->dev, sizeof(*i2c_dev), GFP_KERNEL);
> + if (!i2c_dev)
> + return -ENOMEM;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + i2c_dev->base = devm_ioremap_resource(&pdev->dev, res);
> + if (IS_ERR(i2c_dev->base))
> + return PTR_ERR(i2c_dev->base);
> +
> + i2c_dev->irq = irq_of_parse_and_map(np, 0);
> + if (!i2c_dev->irq) {
> + dev_err(&pdev->dev, "IRQ missing or invalid\n");
> + return -EINVAL;
> + }
> +
> + i2c_dev->clk = of_clk_get(np, 0);
> + if (IS_ERR(i2c_dev->clk)) {
> + dev_err(&pdev->dev, "Unable to request clock\n");
> + return PTR_ERR(i2c_dev->clk);
> + }
> +
> + i2c_dev->mode = I2C_MODE_STANDARD;
> + ret = of_property_read_u32(np, "clock-frequency", &clk_rate);
> + if ((!ret) && (clk_rate == 400000))
> + i2c_dev->mode = I2C_MODE_FAST;
> +
> + i2c_dev->dev = &pdev->dev;
> +
> + ret = devm_request_irq(&pdev->dev, i2c_dev->irq, st_i2c_isr, 0,
> + pdev->name, i2c_dev);
> + if (ret) {
> + dev_err(&pdev->dev, "Failed to request irq %i\n", i2c_dev->irq);
> + return ret;
> + }
> +
> + pinctrl_pm_select_default_state(i2c_dev->dev);
> + /* In case idle state available, select it */
> + pinctrl_pm_select_idle_state(i2c_dev->dev);
> +
> + ret = st_i2c_of_get_glitches(np, i2c_dev);
> + if (ret)
> + return ret;
> +
> + adap = &i2c_dev->adap;
> + i2c_set_adapdata(adap, i2c_dev);
> + snprintf(adap->name, sizeof(adap->name), "ST I2C(0x%08x)", res->start);
> + adap->owner = THIS_MODULE;
> + adap->timeout = 2 * HZ;
> + adap->retries = 0;
> + adap->class = I2C_CLASS_HWMON | I2C_CLASS_DDC | I2C_CLASS_SPD;
> + adap->algo = &st_i2c_algo;
> + adap->dev.parent = &pdev->dev;
> + adap->dev.of_node = pdev->dev.of_node;
> +
> + ret = i2c_add_adapter(adap);
> + if (ret) {
> + dev_err(&pdev->dev, "Failed to add adapter\n");
> + return ret;
> + }
> +
> + platform_set_drvdata(pdev, i2c_dev);
> +
> + dev_info(i2c_dev->dev, "%s initialized\n", adap->name);
> +
> + return 0;
> +}
> +
> +static int st_i2c_remove(struct platform_device *pdev)
> +{
> + struct st_i2c_dev *i2c_dev = platform_get_drvdata(pdev);
> +
> + i2c_del_adapter(&i2c_dev->adap);
> +
> + return 0;
> +}
> +
> +static struct of_device_id st_i2c_match[] = {
> + { .compatible = "st,comms-i2c", },
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, st_i2c_match);
> +
> +static struct platform_driver st_i2c_driver = {
> + .driver = {
> + .name = DRIVER_NAME,
> + .owner = THIS_MODULE,
> + .of_match_table = st_i2c_match,
> + .pm = &st_i2c_pm,
> + },
> + .probe = st_i2c_probe,
> + .remove = st_i2c_remove,
> +};
> +
> +module_platform_driver(st_i2c_driver);
> +
> +MODULE_AUTHOR("STMicroelectronics");
> +MODULE_DESCRIPTION("STMicroelectronics I2C driver");
> +MODULE_LICENSE("GPL");
> diff --git a/drivers/i2c/busses/i2c-st.h b/drivers/i2c/busses/i2c-st.h
> new file mode 100644
> index 0000000..7bce6c0
> --- /dev/null
> +++ b/drivers/i2c/busses/i2c-st.h
> @@ -0,0 +1,216 @@
> +/*
> + * Copyright (C) 2013 STMicroelectronics
> + *
> + * I2C master mode controller driver, used in STMicroelectronics devices.
> + *
> + * Author: Maxime Coquelin <maxime.coquelin@st.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2, as
> + * published by the Free Software Foundation.
> + */
> +
> +#ifndef __I2C_ST_H_
> +#define __I2C_ST_H_
> +
> +/* SSC registers */
> +#define SSC_BRG 0x000
> +#define SSC_TBUF 0x004
> +#define SSC_RBUF 0x008
> +#define SSC_CTL 0x00C
> +#define SSC_IEN 0x010
> +#define SSC_STA 0x014
> +#define SSC_I2C 0x018
> +#define SSC_SLAD 0x01C
> +#define SSC_REP_START_HOLD 0x020
> +#define SSC_START_HOLD 0x024
> +#define SSC_REP_START_SETUP 0x028
> +#define SSC_DATA_SETUP 0x02C
> +#define SSC_STOP_SETUP 0x030
> +#define SSC_BUS_FREE 0x034
> +#define SSC_TX_FSTAT 0x038
> +#define SSC_RX_FSTAT 0x03C
> +#define SSC_PRE_SCALER_BRG 0x040
> +#define SSC_CLR 0x080
> +#define SSC_NOISE_SUPP_WIDTH 0x100
> +#define SSC_PRSCALER 0x104
> +#define SSC_NOISE_SUPP_WIDTH_DATAOUT 0x108
> +#define SSC_PRSCALER_DATAOUT 0x10c
> +
> +/* SSC Control */
> +#define SSC_CTL_DATA_WIDTH_9 0x8
> +#define SSC_CTL_DATA_WIDTH_MSK 0xf
> +#define SSC_CTL_BM 0xf
> +#define SSC_CTL_HB BIT(4)
> +#define SSC_CTL_PH BIT(5)
> +#define SSC_CTL_PO BIT(6)
> +#define SSC_CTL_SR BIT(7)
> +#define SSC_CTL_MS BIT(8)
> +#define SSC_CTL_EN BIT(9)
> +#define SSC_CTL_LPB BIT(10)
> +#define SSC_CTL_EN_TX_FIFO BIT(11)
> +#define SSC_CTL_EN_RX_FIFO BIT(12)
> +#define SSC_CTL_EN_CLST_RX BIT(13)
> +
> +/* SSC Interrupt Enable */
> +#define SSC_IEN_RIEN BIT(0)
> +#define SSC_IEN_TIEN BIT(1)
> +#define SSC_IEN_TEEN BIT(2)
> +#define SSC_IEN_REEN BIT(3)
> +#define SSC_IEN_PEEN BIT(4)
> +#define SSC_IEN_AASEN BIT(6)
> +#define SSC_IEN_STOPEN BIT(7)
> +#define SSC_IEN_ARBLEN BIT(8)
> +#define SSC_IEN_NACKEN BIT(10)
> +#define SSC_IEN_REPSTRTEN BIT(11)
> +#define SSC_IEN_TX_FIFO_HALF BIT(12)
> +#define SSC_IEN_RX_FIFO_HALF_FULL BIT(14)
> +
> +/* SSC Status */
> +#define SSC_STA_RIR BIT(0)
> +#define SSC_STA_TIR BIT(1)
> +#define SSC_STA_TE BIT(2)
> +#define SSC_STA_RE BIT(3)
> +#define SSC_STA_PE BIT(4)
> +#define SSC_STA_CLST BIT(5)
> +#define SSC_STA_AAS BIT(6)
> +#define SSC_STA_STOP BIT(7)
> +#define SSC_STA_ARBL BIT(8)
> +#define SSC_STA_BUSY BIT(9)
> +#define SSC_STA_NACK BIT(10)
> +#define SSC_STA_REPSTRT BIT(11)
> +#define SSC_STA_TX_FIFO_HALF BIT(12)
> +#define SSC_STA_TX_FIFO_FULL BIT(13)
> +#define SSC_STA_RX_FIFO_HALF BIT(14)
> +
> +/* SSC I2C Control */
> +#define SSC_I2C_I2CM BIT(0)
> +#define SSC_I2C_STRTG BIT(1)
> +#define SSC_I2C_STOPG BIT(2)
> +#define SSC_I2C_ACKG BIT(3)
> +#define SSC_I2C_AD10 BIT(4)
> +#define SSC_I2C_TXENB BIT(5)
> +#define SSC_I2C_REPSTRTG BIT(11)
> +#define SSC_I2C_SLAVE_DISABLE BIT(12)
> +
> +/* SSC Tx FIFO Status */
> +#define SSC_TX_FSTAT_STATUS 0x07
> +
> +/* SSC Rx FIFO Status */
> +#define SSC_RX_FSTAT_STATUS 0x07
> +
> +/* SSC Clear bit operation */
> +#define SSC_CLR_SSCAAS BIT(6)
> +#define SSC_CLR_SSCSTOP BIT(7)
> +#define SSC_CLR_SSCARBL BIT(8)
> +#define SSC_CLR_NACK BIT(10)
> +#define SSC_CLR_REPSTRT BIT(11)
> +
> +/* SSC Clock Prescaler */
> +#define SSC_PRSC_VALUE 0x0f
> +
> +
> +#define SSC_TXFIFO_SIZE 0x8
> +#define SSC_RXFIFO_SIZE 0x8
> +
> +enum st_i2c_mode {
> + I2C_MODE_STANDARD,
> + I2C_MODE_FAST,
> + I2C_MODE_END,
> +};
> +
> +/**
> + * struct st_i2c_timings - per-Mode tuning parameters
> + * @rate: I2C bus rate
> + * @rep_start_hold: I2C repeated start hold time requirement
> + * @rep_start_setup: I2C repeated start set up time requirement
> + * @start_hold: I2C start hold time requirement
> + * @data_setup_time: I2C data set up time requirement
> + * @stop_setup_time: I2C stop set up time requirement
> + * @bus_free_time: I2C bus free time requirement
> + * @glitch_dat_max: I2C data glitch max time
> + */
> +struct st_i2c_timings {
> + u32 rate;
> + u32 rep_start_hold;
> + u32 rep_start_setup;
> + u32 start_hold;
> + u32 data_setup_time;
> + u32 stop_setup_time;
> + u32 bus_free_time;
> + u32 glitch_dat_max;
> +};
> +
> +/**
> + * struct st_i2c_glitches - per-SoC tuning parameters
> + * @glitches: Glitches are defined for this SoC
> + * @glitch_clk: Clk line glitch tuning value
> + * @glitch_dat: Data line glitch tuning value
> + * @hw_glitches: HW glitches are defined for this SoC
> + * @hw_glitch_clk: Clk line hw glitch value
> + * @hw_glitch_dat: Data line hw glitch value
> + */
> +struct st_i2c_glitches {
> + bool glitches;
> + u32 glitch_clk;
> + u32 glitch_dat;
> + bool hw_glitches;
> + u32 hw_glitch_clk;
> + u32 hw_glitch_dat;
> +};
> +
> +/**
> + * struct st_i2c_client - client specific data
> + * @addr: 8-bit slave addr, including r/w bit
> + * @count: number of bytes to be transfered
> + * @xfered: number of bytes already transferred
> + * @buf: data buffer
> + * @result: result of the transfer
> + * @stop: last I2C msg to be sent, i.e. STOP to be generated
> + */
> +struct st_i2c_client {
> + u8 addr;
> + u32 count;
> + u32 xfered;
> + u8 *buf;
> + int result;
> + bool stop;
> +};
> +
> +/**
> + * struct st_i2c_dev - private data of the controller
> + * @adap: I2C adapter for this controller
> + * @dev: device for this controller
> + * @base: virtual memory area
> + * @complete: completion of I2C message
> + * @irq: interrupt line for th controller
> + * @clk: hw ssc block clock
> + * @mode: I2C mode of the controller. Standard or Fast only supported
> + * @glitches: Glitch filters tuning parameters
> + * @client: I2C transfert information
> + * @busy: I2C transfer on-going
> + */
> +struct st_i2c_dev {
> + struct i2c_adapter adap;
> + struct device *dev;
> + void __iomem *base;
> + struct completion complete;
> + int irq;
> + struct clk *clk;
> + int mode;
> + struct st_i2c_glitches glitches;
> + struct st_i2c_client client;
> + bool busy;
> +};
> +
> +static inline void st_i2c_set_bits(void __iomem *reg, u32 mask)
> +{
> + writel(readl(reg) | mask, reg);
> +}
> +
> +static inline void st_i2c_clr_bits(void __iomem *reg, u32 mask)
> +{
> + writel(readl(reg) & ~mask, reg);
> +}
> +
> +#endif /* __I2C_ST_H_ */
> --
> 1.7.9.5
>
^ permalink raw reply [flat|nested] 17+ messages in thread
* Re: [PATCH 1/4] i2c: busses: i2c-st: Add ST I2C controller
[not found] ` <5239A0ED.6010606-qxv4g6HH51o@public.gmane.org>
@ 2013-09-23 20:55 ` Stephen Warren
0 siblings, 0 replies; 17+ messages in thread
From: Stephen Warren @ 2013-09-23 20:55 UTC (permalink / raw)
To: Gabriel FERNANDEZ
Cc: Maxime COQUELIN, Wolfram Sang, Srinivas KANDAGATLA, Rob Herring,
Pawel Moll, Mark Rutland, Ian Campbell, Rob Landley, Russell King,
Grant Likely, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Stephen GALLIMORE, Stuart MENEFY, Lee Jones, Olivier CLERGEAUD
On 09/18/2013 06:47 AM, Gabriel FERNANDEZ wrote:
> On 18/09/2013 12:01, Maxime COQUELIN wrote:
>> This patch adds support to SSC (Synchronous Serial Controller)
>> I2C driver. This IP also supports SPI protocol, but this is not
>> the aim of this driver.
>>
>> This IP is embedded in all ST SoCs for Set-top box platorms, and
>> supports I2C Standard and Fast modes.
> ... [entire patch quoted for a one-line comment] ...
Please trim down the patch so you only quote relevant lines. Quoting the
entire patch for a 1-line comment makes people wast time searching for
your reply.
^ permalink raw reply [flat|nested] 17+ messages in thread
* Re: [PATCH 1/4] i2c: busses: i2c-st: Add ST I2C controller
[not found] ` <1379498483-4236-2-git-send-email-maxime.coquelin-qxv4g6HH51o@public.gmane.org>
@ 2013-09-23 21:06 ` Stephen Warren
[not found] ` <5240AD6E.4090905-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
0 siblings, 1 reply; 17+ messages in thread
From: Stephen Warren @ 2013-09-23 21:06 UTC (permalink / raw)
To: Maxime COQUELIN
Cc: Wolfram Sang, srinivas.kandagatla-qxv4g6HH51o, Rob Herring,
Pawel Moll, Mark Rutland, Ian Campbell, Rob Landley, Russell King,
Grant Likely, devicetree-u79uwXL29TY76Z2rM5mHXA,
linux-doc-u79uwXL29TY76Z2rM5mHXA,
linux-kernel-u79uwXL29TY76Z2rM5mHXA,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r,
linux-i2c-u79uwXL29TY76Z2rM5mHXA, stephen.gallimore-qxv4g6HH51o,
stuart.menefy-qxv4g6HH51o, Lee Jones,
gabriel.fernandez-qxv4g6HH51o, olivier.clergeaud-qxv4g6HH51o
On 09/18/2013 04:01 AM, Maxime COQUELIN wrote:
> This patch adds support to SSC (Synchronous Serial Controller)
> I2C driver. This IP also supports SPI protocol, but this is not
> the aim of this driver.
>
> This IP is embedded in all ST SoCs for Set-top box platorms, and
> supports I2C Standard and Fast modes.
> diff --git a/Documentation/devicetree/bindings/i2c/i2c-st.txt b/Documentation/devicetree/bindings/i2c/i2c-st.txt
> +I2C for ST platforms
If the HW block supports both I2C and SPI, the DT binding ought to
support that too. It's be best to create a single DT binding that
represents the IP block, and include a property that indicates whether
the device should operate in I2C or SPI mode.
I suppose you could reasonably define different compatible values for
those two cases. However, the binding should be titled something more
like "ST SSC binding, for I2C mode operation" and "ST SSC binding, for
SPI mode operation", rather than "I2C for ST platforms", since the HW
includes an SSC block, not an I2C block.
> +Required properties :
> +- compatible : Must be "st,comms-i2c"
> +- reg : Offset and length of the register set for the device
> +- interrupts : the interrupt number
It's an interrupt specifier, not an interrupt number. The format is
defined by the interrupt controller, not this binding.
> +- clocks : phandle to the I2C clock source
What about clock-names?
> +Recommended (non-standard) properties :
Usually you'd just say "Optional properties:", or perhaps "Recommended
properties:". I don't think adding "(non-standard)" serves any purpose.
> +- clock-frequency : Desired I2C bus clock frequency in Hz. Otherwise
> + the default 100 kHz frequency will be used. As only Normal and Fast modes
> + are supported, possible values are 100000 and 400000.
> +
> +Optional (non-standard) properties:
Same here.
> +- st,glitches : Enable timing glitch suppression support.
That property name doesn't really convey the "enables" that appears in
the property description to me...
> +- st,glitch-clk : SCL line timinig glitch suppression value in ns.
> +- st,glitch-dat : SDA line timinig glitch suppression value in ns.
s/timinig/timing/
> +- st,hw-glitches : Enable filter glitch suppression support.
> +- st,hw-glitch-clk : SCL line filter glitch suppression value in us.
> +- st,hw-glitch-dat : SDA line filter glitch suppression value in us.
Those sound more like runtime configuration rather than HW description.
Can you rephrase the descriptions (and property names) more along the
lines of HW properties? Perhaps e.g.:
st,needs-glitch-suppression: The board design needs timing glitch
suppression enabled to operate reliably.
st,min-scl-pulse-width: The minimum valid SCL pulse width that is
allowed through the deglitch circuit. In units of ns.
(I just made up those descriptions to give a feel for the flavor of
description that I expect. They likely need some adjustment to reflect
whatever they're actually intended to represent in HW).
What is the difference between "glitch" and "hw-glitch"?
^ permalink raw reply [flat|nested] 17+ messages in thread
* Re: [PATCH 1/4] i2c: busses: i2c-st: Add ST I2C controller
[not found] ` <5240AD6E.4090905-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
@ 2013-09-24 15:38 ` Maxime COQUELIN
[not found] ` <5241B1FA.6020500-qxv4g6HH51o@public.gmane.org>
0 siblings, 1 reply; 17+ messages in thread
From: Maxime COQUELIN @ 2013-09-24 15:38 UTC (permalink / raw)
To: Stephen Warren
Cc: Wolfram Sang, Srinivas KANDAGATLA, Rob Herring, Pawel Moll,
Mark Rutland, Ian Campbell, Rob Landley, Russell King,
Grant Likely, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Stephen GALLIMORE, Stuart MENEFY, Lee Jones, Gabriel FERNANDEZ,
Olivier CLERGEAUD
On 09/23/2013 11:06 PM, Stephen Warren wrote:
> On 09/18/2013 04:01 AM, Maxime COQUELIN wrote:
>> This patch adds support to SSC (Synchronous Serial Controller)
>> I2C driver. This IP also supports SPI protocol, but this is not
>> the aim of this driver.
>>
>> This IP is embedded in all ST SoCs for Set-top box platorms, and
>> supports I2C Standard and Fast modes.
>> diff --git a/Documentation/devicetree/bindings/i2c/i2c-st.txt b/Documentation/devicetree/bindings/i2c/i2c-st.txt
>> +I2C for ST platforms
> If the HW block supports both I2C and SPI, the DT binding ought to
> support that too. It's be best to create a single DT binding that
> represents the IP block, and include a property that indicates whether
> the device should operate in I2C or SPI mode.
>
> I suppose you could reasonably define different compatible values for
> those two cases. However, the binding should be titled something more
> like "ST SSC binding, for I2C mode operation" and "ST SSC binding, for
> SPI mode operation", rather than "I2C for ST platforms", since the HW
> includes an SSC block, not an I2C block.
You are right Stephen.
I will rename the title and change the compatible value as per your
recommendation.
>> +Required properties :
>> +- compatible : Must be "st,comms-i2c"
>> +- reg : Offset and length of the register set for the device
>> +- interrupts : the interrupt number
> It's an interrupt specifier, not an interrupt number. The format is
> defined by the interrupt controller, not this binding.
Ok. I will change to "the interrupt specifier".
>> +- clocks : phandle to the I2C clock source
> What about clock-names?
It will be added in next revision. It will be named "ssc"
>> +Recommended (non-standard) properties :
> Usually you'd just say "Optional properties:", or perhaps "Recommended
> properties:". I don't think adding "(non-standard)" serves any purpose.
Ok. then I will remove all the "non-standard" occurences.
>> +- clock-frequency : Desired I2C bus clock frequency in Hz. Otherwise
>> + the default 100 kHz frequency will be used. As only Normal and Fast modes
>> + are supported, possible values are 100000 and 400000.
>> +
>> +Optional (non-standard) properties:
> Same here.
>
>> +- st,glitches : Enable timing glitch suppression support.
> That property name doesn't really convey the "enables" that appears in
> the property description to me...
>
>> +- st,glitch-clk : SCL line timinig glitch suppression value in ns.
>> +- st,glitch-dat : SDA line timinig glitch suppression value in ns.
> s/timinig/timing/
>
>> +- st,hw-glitches : Enable filter glitch suppression support.
>> +- st,hw-glitch-clk : SCL line filter glitch suppression value in us.
>> +- st,hw-glitch-dat : SDA line filter glitch suppression value in us.
> Those sound more like runtime configuration rather than HW description.
> Can you rephrase the descriptions (and property names) more along the
> lines of HW properties? Perhaps e.g.:
>
> st,needs-glitch-suppression: The board design needs timing glitch
> suppression enabled to operate reliably.
>
> st,min-scl-pulse-width: The minimum valid SCL pulse width that is
> allowed through the deglitch circuit. In units of ns.
>
> (I just made up those descriptions to give a feel for the flavor of
> description that I expect. They likely need some adjustment to reflect
> whatever they're actually intended to represent in HW).
>
> What is the difference between "glitch" and "hw-glitch"?
"hw-glitch" is used to configure the anti-glitch filters.
It suppresses the pulses with a width lower than x microseconds.
"glitch" is is used to tune the I2C timing requirements, and has a
nanosecond granularity.
These values are added to default timing values.
I'm not 100% sure, but it looks like the "samsung,i2c-sda-delay" in the
i2c-s3c2410 driver.
I agree the names and descriptions are not clear, and even misleading.
I will come with a clearer implementation, as soon as I get
clarification from HW team.
Thanks for the review,
Maxime
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^ permalink raw reply [flat|nested] 17+ messages in thread
* Re: [PATCH 1/4] i2c: busses: i2c-st: Add ST I2C controller
[not found] ` <5241B1FA.6020500-qxv4g6HH51o@public.gmane.org>
@ 2013-09-24 15:59 ` Wolfram Sang
2013-09-26 9:30 ` Maxime COQUELIN
0 siblings, 1 reply; 17+ messages in thread
From: Wolfram Sang @ 2013-09-24 15:59 UTC (permalink / raw)
To: Maxime COQUELIN
Cc: Stephen Warren, Srinivas KANDAGATLA, Rob Herring, Pawel Moll,
Mark Rutland, Ian Campbell, Rob Landley, Russell King,
Grant Likely, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Stephen GALLIMORE, Stuart MENEFY, Lee Jones, Gabriel FERNANDEZ,
Olivier CLERGEAUD
[-- Attachment #1: Type: text/plain, Size: 375 bytes --]
> "glitch" is is used to tune the I2C timing requirements, and has a
> nanosecond granularity.
> These values are added to default timing values.
> I'm not 100% sure, but it looks like the "samsung,i2c-sda-delay" in the
> i2c-s3c2410 driver.
For that, we have the generic "i2c-sda-hold-time-ns" property. The s3c
driver hasn't been converted to use it, sadly.
[-- Attachment #2: Digital signature --]
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^ permalink raw reply [flat|nested] 17+ messages in thread
* Re: [PATCH 1/4] i2c: busses: i2c-st: Add ST I2C controller
2013-09-24 15:59 ` Wolfram Sang
@ 2013-09-26 9:30 ` Maxime COQUELIN
0 siblings, 0 replies; 17+ messages in thread
From: Maxime COQUELIN @ 2013-09-26 9:30 UTC (permalink / raw)
To: Wolfram Sang
Cc: Stephen Warren, Srinivas KANDAGATLA, Rob Herring, Pawel Moll,
Mark Rutland, Ian Campbell, Rob Landley, Russell King,
Grant Likely, devicetree@vger.kernel.org,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, linux-i2c@vger.kernel.org,
Stephen GALLIMORE, Stuart MENEFY, Lee Jones, Gabriel FERNANDEZ,
Olivier CLERGEAUD
On 09/24/2013 05:59 PM, Wolfram Sang wrote:
>> "glitch" is is used to tune the I2C timing requirements, and has a
>> nanosecond granularity.
>> These values are added to default timing values.
>> I'm not 100% sure, but it looks like the "samsung,i2c-sda-delay" in the
>> i2c-s3c2410 driver.
> For that, we have the generic "i2c-sda-hold-time-ns" property. The s3c
> driver hasn't been converted to use it, sadly.
>
Ok, thank you for pointing this out.
After some checks, this property doesn't match with what is done in this
driver.
In the v2 series I am sending, I removed the I2C timing tuning as it
works on all
the boards I have tested with.
I will only keep the anti-glitch filtering, using private properties as
I didn't find any generic
ones that could fit.
Regards,
Maxime
^ permalink raw reply [flat|nested] 17+ messages in thread
* [PATCH v3 0/4] Add I2C support to ST SoCs
@ 2013-10-01 10:39 Maxime COQUELIN
[not found] ` <1380623952-4252-1-git-send-email-maxime.coquelin-qxv4g6HH51o@public.gmane.org>
` (2 more replies)
0 siblings, 3 replies; 17+ messages in thread
From: Maxime COQUELIN @ 2013-10-01 10:39 UTC (permalink / raw)
To: Wolfram Sang, srinivas.kandagatla, Rob Herring, Pawel Moll,
Mark Rutland, Stephen Warren, Ian Campbell, Rob Landley,
Russell King, Grant Likely, devicetree, linux-doc, linux-kernel,
linux-arm-kernel, linux-i2c
Cc: stephen.gallimore, stuart.menefy, Lee Jones, gabriel.fernandez,
kernel, Maxime Coquelin
The goal of this series is to add I2C support to ST SoCs.
The DT definition is added for STiH415 and STiH416 SoCs on
B2000 and B2020 boards.
The series has been tested working on STiH416-B2020 board.
It applies on top of v3.12-rc3.
Changes since v2:
- Create generic DT property for Anti-glitch filtering configuration
- Sort i2c-st entries in Makefile and Kconfig
- Various cosmetics changes
- Return IRQ_NONE in case of spurious interrupt
- Use INIT_COMPLETION instead of init_completion in st_i2c_xfer_msg
- Simplify st_i2c_xfer as proposed by Wolfram
- Fix PM ops issues
- Change author name to myself and fix license to GPL v2
- Include .h file content into the .c file
Changes since v1:
- Anti-glitch filtering simplified (Only HW Anti-glitch is kept)
- Update I2C timings to comply with I2C specification
- Handle spurious interrupts properly
- DT binding updates taking into account Stephen's comments
- Use "clock-names" property to comply with GCF
- DT cosmetic changes reported by Lee and Gabriel
Signed-off-by: Maxime Coquelin <maxime.coquelin@st.com>
Maxime Coquelin (4):
i2c: busses: i2c-st: Add ST I2C controller
ARM: STi: Supply I2C configuration to STiH416 SoC
ARM: STi: Supply I2C configuration to STiH415 SoC
ARM: STi: Add I2C config to B2000 and B2020 boards
Documentation/devicetree/bindings/i2c/i2c-st.txt | 34 +
arch/arm/boot/dts/stih415-pinctrl.dtsi | 36 +
arch/arm/boot/dts/stih415.dtsi | 53 ++
arch/arm/boot/dts/stih416-pinctrl.dtsi | 35 +
arch/arm/boot/dts/stih416.dtsi | 53 ++
arch/arm/boot/dts/stih41x-b2000.dtsi | 9 +
arch/arm/boot/dts/stih41x-b2020.dtsi | 22 +
drivers/i2c/busses/Kconfig | 10 +
drivers/i2c/busses/Makefile | 1 +
drivers/i2c/busses/i2c-st.c | 867 ++++++++++++++++++++++
10 files changed, 1120 insertions(+)
create mode 100644 Documentation/devicetree/bindings/i2c/i2c-st.txt
create mode 100644 drivers/i2c/busses/i2c-st.c
--
1.7.9.5
^ permalink raw reply [flat|nested] 17+ messages in thread
* [PATCH 1/4] i2c: busses: i2c-st: Add ST I2C controller
[not found] ` <1380623952-4252-1-git-send-email-maxime.coquelin-qxv4g6HH51o@public.gmane.org>
@ 2013-10-01 10:39 ` Maxime COQUELIN
[not found] ` <1380623952-4252-2-git-send-email-maxime.coquelin-qxv4g6HH51o@public.gmane.org>
2013-10-01 10:39 ` [PATCH 3/4] ARM: STi: Supply I2C configuration to STiH415 SoC Maxime COQUELIN
1 sibling, 1 reply; 17+ messages in thread
From: Maxime COQUELIN @ 2013-10-01 10:39 UTC (permalink / raw)
To: Wolfram Sang, srinivas.kandagatla-qxv4g6HH51o, Rob Herring,
Pawel Moll, Mark Rutland, Stephen Warren, Ian Campbell,
Rob Landley, Russell King, Grant Likely,
devicetree-u79uwXL29TY76Z2rM5mHXA,
linux-doc-u79uwXL29TY76Z2rM5mHXA,
linux-kernel-u79uwXL29TY76Z2rM5mHXA,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r,
linux-i2c-u79uwXL29TY76Z2rM5mHXA
Cc: stephen.gallimore-qxv4g6HH51o, stuart.menefy-qxv4g6HH51o,
Lee Jones, gabriel.fernandez-qxv4g6HH51o,
kernel-F5mvAk5X5gdBDgjK7y7TUQ, Maxime Coquelin
This patch adds support to SSC (Synchronous Serial Controller)
I2C driver. This IP also supports SPI protocol, but this is not
the aim of this driver.
This IP is embedded in all ST SoCs for Set-top box platorms, and
supports I2C Standard and Fast modes.
Signed-off-by: Maxime Coquelin <maxime.coquelin-qxv4g6HH51o@public.gmane.org>
Cc: Srinivas Kandagatla <srinivas.kandagatla-qxv4g6HH51o@public.gmane.org>
---
Documentation/devicetree/bindings/i2c/i2c-st.txt | 34 +
drivers/i2c/busses/Kconfig | 10 +
drivers/i2c/busses/Makefile | 1 +
drivers/i2c/busses/i2c-st.c | 867 ++++++++++++++++++++++
4 files changed, 912 insertions(+)
create mode 100644 Documentation/devicetree/bindings/i2c/i2c-st.txt
create mode 100644 drivers/i2c/busses/i2c-st.c
diff --git a/Documentation/devicetree/bindings/i2c/i2c-st.txt b/Documentation/devicetree/bindings/i2c/i2c-st.txt
new file mode 100644
index 0000000..ea0572e
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/i2c-st.txt
@@ -0,0 +1,34 @@
+ST SSC binding, for I2C mode operation
+
+Required properties :
+- compatible : Must be "st,comms-i2c"
+- reg : Offset and length of the register set for the device
+- interrupts : the interrupt specifier
+- clocks : phandle to the I2C clock source
+- clock-names : from common clock binding: Shall be "ssc"
+
+Recommended properties :
+- clock-frequency : Desired I2C bus clock frequency in Hz. Otherwise
+ the default 100 kHz frequency will be used. As only Normal and Fast modes
+ are supported, possible values are 100000 and 400000.
+
+Optional properties :
+- i2c-min-scl-pulse-width-us : The minimum valid SCL pulse width that is allowed
+ through the deglitch circuit. In units of us.
+- i2c-min-sda-pulse-width-us : The minimum valid SDA pulse width that is allowed
+ through the deglitch circuit. In units of us.
+
+Examples :
+
+i2c0: i2c@fed40000 {
+ compatible = "st,comms-ssc-i2c";
+ reg = <0xfed40000 0x110>;
+ interrupts = <GIC_SPI 187 IRQ_TYPE_EDGE_RISING>;
+ clocks = <&CLK_S_ICN_REG_0>;
+ clock-names = "ssc";
+ clock-frequency = <400000>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&pinctrl_i2c0_default>;
+ i2c-min-scl-pulse-width-us = <0>;
+ i2c-min-sda-pulse-width-us = <5>;
+};
diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index cdcbd83..67f85f9 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -695,6 +695,16 @@ config I2C_SIRF
This driver can also be built as a module. If so, the module
will be called i2c-sirf.
+config I2C_ST
+ tristate "STMicroelectronics SSC I2C support"
+ depends on ARCH_STI
+ help
+ Enable this option to add support for STMicroelectronics SoCs
+ hardware SSC (Synchronous Serial Controller) as an I2C controller.
+
+ This driver can also be built as module. If so, the module
+ will be called i2c-st.
+
config I2C_STU300
tristate "ST Microelectronics DDC I2C interface"
depends on MACH_U300
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index d00997f..a0f52e4 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -68,6 +68,7 @@ obj-$(CONFIG_I2C_SH7760) += i2c-sh7760.o
obj-$(CONFIG_I2C_SH_MOBILE) += i2c-sh_mobile.o
obj-$(CONFIG_I2C_SIMTEC) += i2c-simtec.o
obj-$(CONFIG_I2C_SIRF) += i2c-sirf.o
+obj-$(CONFIG_I2C_ST) += i2c-st.o
obj-$(CONFIG_I2C_STU300) += i2c-stu300.o
obj-$(CONFIG_I2C_TEGRA) += i2c-tegra.o
obj-$(CONFIG_I2C_VERSATILE) += i2c-versatile.o
diff --git a/drivers/i2c/busses/i2c-st.c b/drivers/i2c/busses/i2c-st.c
new file mode 100644
index 0000000..a22e0b2
--- /dev/null
+++ b/drivers/i2c/busses/i2c-st.c
@@ -0,0 +1,867 @@
+/*
+ * Copyright (C) 2013 STMicroelectronics
+ *
+ * I2C master mode controller driver, used in STMicroelectronics devices.
+ *
+ * Author: Maxime Coquelin <maxime.coquelin-qxv4g6HH51o@public.gmane.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2, as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/i2c.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+
+/* SSC registers */
+#define SSC_BRG 0x000
+#define SSC_TBUF 0x004
+#define SSC_RBUF 0x008
+#define SSC_CTL 0x00C
+#define SSC_IEN 0x010
+#define SSC_STA 0x014
+#define SSC_I2C 0x018
+#define SSC_SLAD 0x01C
+#define SSC_REP_START_HOLD 0x020
+#define SSC_START_HOLD 0x024
+#define SSC_REP_START_SETUP 0x028
+#define SSC_DATA_SETUP 0x02C
+#define SSC_STOP_SETUP 0x030
+#define SSC_BUS_FREE 0x034
+#define SSC_TX_FSTAT 0x038
+#define SSC_RX_FSTAT 0x03C
+#define SSC_PRE_SCALER_BRG 0x040
+#define SSC_CLR 0x080
+#define SSC_NOISE_SUPP_WIDTH 0x100
+#define SSC_PRSCALER 0x104
+#define SSC_NOISE_SUPP_WIDTH_DATAOUT 0x108
+#define SSC_PRSCALER_DATAOUT 0x10c
+
+/* SSC Control */
+#define SSC_CTL_DATA_WIDTH_9 0x8
+#define SSC_CTL_DATA_WIDTH_MSK 0xf
+#define SSC_CTL_BM 0xf
+#define SSC_CTL_HB BIT(4)
+#define SSC_CTL_PH BIT(5)
+#define SSC_CTL_PO BIT(6)
+#define SSC_CTL_SR BIT(7)
+#define SSC_CTL_MS BIT(8)
+#define SSC_CTL_EN BIT(9)
+#define SSC_CTL_LPB BIT(10)
+#define SSC_CTL_EN_TX_FIFO BIT(11)
+#define SSC_CTL_EN_RX_FIFO BIT(12)
+#define SSC_CTL_EN_CLST_RX BIT(13)
+
+/* SSC Interrupt Enable */
+#define SSC_IEN_RIEN BIT(0)
+#define SSC_IEN_TIEN BIT(1)
+#define SSC_IEN_TEEN BIT(2)
+#define SSC_IEN_REEN BIT(3)
+#define SSC_IEN_PEEN BIT(4)
+#define SSC_IEN_AASEN BIT(6)
+#define SSC_IEN_STOPEN BIT(7)
+#define SSC_IEN_ARBLEN BIT(8)
+#define SSC_IEN_NACKEN BIT(10)
+#define SSC_IEN_REPSTRTEN BIT(11)
+#define SSC_IEN_TX_FIFO_HALF BIT(12)
+#define SSC_IEN_RX_FIFO_HALF_FULL BIT(14)
+
+/* SSC Status */
+#define SSC_STA_RIR BIT(0)
+#define SSC_STA_TIR BIT(1)
+#define SSC_STA_TE BIT(2)
+#define SSC_STA_RE BIT(3)
+#define SSC_STA_PE BIT(4)
+#define SSC_STA_CLST BIT(5)
+#define SSC_STA_AAS BIT(6)
+#define SSC_STA_STOP BIT(7)
+#define SSC_STA_ARBL BIT(8)
+#define SSC_STA_BUSY BIT(9)
+#define SSC_STA_NACK BIT(10)
+#define SSC_STA_REPSTRT BIT(11)
+#define SSC_STA_TX_FIFO_HALF BIT(12)
+#define SSC_STA_TX_FIFO_FULL BIT(13)
+#define SSC_STA_RX_FIFO_HALF BIT(14)
+
+/* SSC I2C Control */
+#define SSC_I2C_I2CM BIT(0)
+#define SSC_I2C_STRTG BIT(1)
+#define SSC_I2C_STOPG BIT(2)
+#define SSC_I2C_ACKG BIT(3)
+#define SSC_I2C_AD10 BIT(4)
+#define SSC_I2C_TXENB BIT(5)
+#define SSC_I2C_REPSTRTG BIT(11)
+#define SSC_I2C_SLAVE_DISABLE BIT(12)
+
+/* SSC Tx FIFO Status */
+#define SSC_TX_FSTAT_STATUS 0x07
+
+/* SSC Rx FIFO Status */
+#define SSC_RX_FSTAT_STATUS 0x07
+
+/* SSC Clear bit operation */
+#define SSC_CLR_SSCAAS BIT(6)
+#define SSC_CLR_SSCSTOP BIT(7)
+#define SSC_CLR_SSCARBL BIT(8)
+#define SSC_CLR_NACK BIT(10)
+#define SSC_CLR_REPSTRT BIT(11)
+
+/* SSC Clock Prescaler */
+#define SSC_PRSC_VALUE 0x0f
+
+
+#define SSC_TXFIFO_SIZE 0x8
+#define SSC_RXFIFO_SIZE 0x8
+
+enum st_i2c_mode {
+ I2C_MODE_STANDARD,
+ I2C_MODE_FAST,
+ I2C_MODE_END,
+};
+
+/**
+ * struct st_i2c_timings - per-Mode tuning parameters
+ * @rate: I2C bus rate
+ * @rep_start_hold: I2C repeated start hold time requirement
+ * @rep_start_setup: I2C repeated start set up time requirement
+ * @start_hold: I2C start hold time requirement
+ * @data_setup_time: I2C data set up time requirement
+ * @stop_setup_time: I2C stop set up time requirement
+ * @bus_free_time: I2C bus free time requirement
+ * @sda_pulse_min_limit: I2C SDA pulse mini width limit
+ */
+struct st_i2c_timings {
+ u32 rate;
+ u32 rep_start_hold;
+ u32 rep_start_setup;
+ u32 start_hold;
+ u32 data_setup_time;
+ u32 stop_setup_time;
+ u32 bus_free_time;
+ u32 sda_pulse_min_limit;
+};
+
+/**
+ * struct st_i2c_deglitch - Anti-glitch filter configuration
+ * @scl_min_width_us: SCL line minimum pulse width in ns
+ * @sda_min_width_us: SDA line minimum pulse width in ns
+ */
+struct st_i2c_deglitch {
+ u32 scl_min_width_us;
+ u32 sda_min_width_us;
+};
+
+/**
+ * struct st_i2c_client - client specific data
+ * @addr: 8-bit slave addr, including r/w bit
+ * @count: number of bytes to be transfered
+ * @xfered: number of bytes already transferred
+ * @buf: data buffer
+ * @result: result of the transfer
+ * @stop: last I2C msg to be sent, i.e. STOP to be generated
+ */
+struct st_i2c_client {
+ u8 addr;
+ u32 count;
+ u32 xfered;
+ u8 *buf;
+ int result;
+ bool stop;
+};
+
+/**
+ * struct st_i2c_dev - private data of the controller
+ * @adap: I2C adapter for this controller
+ * @dev: device for this controller
+ * @base: virtual memory area
+ * @complete: completion of I2C message
+ * @irq: interrupt line for th controller
+ * @clk: hw ssc block clock
+ * @mode: I2C mode of the controller. Standard or Fast only supported
+ * @deglitch: Anti-glitch filters parameters
+ * @client: I2C transfert information
+ * @busy: I2C transfer on-going
+ */
+struct st_i2c_dev {
+ struct i2c_adapter adap;
+ struct device *dev;
+ void __iomem *base;
+ struct completion complete;
+ int irq;
+ struct clk *clk;
+ int mode;
+ struct st_i2c_deglitch deglitch;
+ struct st_i2c_client client;
+ bool busy;
+};
+
+static inline void st_i2c_set_bits(void __iomem *reg, u32 mask)
+{
+ writel(readl(reg) | mask, reg);
+}
+
+static inline void st_i2c_clr_bits(void __iomem *reg, u32 mask)
+{
+ writel(readl(reg) & ~mask, reg);
+}
+
+/* From I2C Specifications v0.5 */
+static struct st_i2c_timings i2c_timings[] = {
+ [I2C_MODE_STANDARD] = {
+ .rate = 100000,
+ .rep_start_hold = 4000,
+ .rep_start_setup = 4700,
+ .start_hold = 4000,
+ .data_setup_time = 250,
+ .stop_setup_time = 4000,
+ .bus_free_time = 4700,
+ },
+ [I2C_MODE_FAST] = {
+ .rate = 400000,
+ .rep_start_hold = 600,
+ .rep_start_setup = 600,
+ .start_hold = 600,
+ .data_setup_time = 100,
+ .stop_setup_time = 600,
+ .bus_free_time = 1300,
+ },
+};
+
+static void st_i2c_flush_rx_fifo(struct st_i2c_dev *i2c_dev)
+{
+ int count, i;
+
+ /*
+ * Counter only counts up to 7 but fifo size is 8...
+ * When fifo is full, counter is 0 and RIR bit of status register is
+ * set
+ */
+ if (readl(i2c_dev->base + SSC_STA) & SSC_STA_RIR)
+ count = SSC_RXFIFO_SIZE;
+ else
+ count = readl(i2c_dev->base + SSC_RX_FSTAT) &
+ SSC_RX_FSTAT_STATUS;
+
+ for (i = 0; i < count; i++)
+ readl(i2c_dev->base + SSC_RBUF);
+}
+
+static void st_i2c_soft_reset(struct st_i2c_dev *i2c_dev)
+{
+ /*
+ * FIFO needs to be emptied before reseting the IP,
+ * else the controller raises a BUSY error.
+ */
+ st_i2c_flush_rx_fifo(i2c_dev);
+
+ st_i2c_set_bits(i2c_dev->base + SSC_CTL, SSC_CTL_SR);
+ st_i2c_clr_bits(i2c_dev->base + SSC_CTL, SSC_CTL_SR);
+}
+
+/**
+ * st_i2c_hw_config() - Prepare SSC block, calculate and apply tuning timings
+ * @i2c_dev: Controller's private data
+ */
+static void st_i2c_hw_config(struct st_i2c_dev *i2c_dev)
+{
+ unsigned long rate;
+ u32 val, ns_per_clk;
+ struct st_i2c_timings *t = &i2c_timings[i2c_dev->mode];
+
+ st_i2c_soft_reset(i2c_dev);
+
+ val = SSC_CLR_REPSTRT | SSC_CLR_NACK | SSC_CLR_SSCARBL |
+ SSC_CLR_SSCAAS | SSC_CLR_SSCSTOP;
+ writel(val, i2c_dev->base + SSC_CLR);
+
+ /* SSC Control register setup */
+ val = SSC_CTL_PO | SSC_CTL_PH | SSC_CTL_HB | SSC_CTL_DATA_WIDTH_9;
+ writel(val, i2c_dev->base + SSC_CTL);
+
+ rate = clk_get_rate(i2c_dev->clk);
+ ns_per_clk = 1000000000 / rate;
+
+ /* Baudrate */
+ val = rate / (2 * t->rate);
+ writel(val, i2c_dev->base + SSC_BRG);
+
+ /* Pre-scaler baudrate */
+ writel(1, i2c_dev->base + SSC_PRE_SCALER_BRG);
+
+ /* Enable I2C mode */
+ writel(SSC_I2C_I2CM, i2c_dev->base + SSC_I2C);
+
+ /* Repeated start hold time */
+ val = t->rep_start_hold / ns_per_clk;
+ writel(val, i2c_dev->base + SSC_REP_START_HOLD);
+
+ /* Repeated start set up time */
+ val = t->rep_start_setup / ns_per_clk;
+ writel(val, i2c_dev->base + SSC_REP_START_SETUP);
+
+ /* Start hold time */
+ val = t->start_hold / ns_per_clk;
+ writel(val, i2c_dev->base + SSC_START_HOLD);
+
+ /* Data set up time */
+ val = t->data_setup_time / ns_per_clk;
+ writel(val, i2c_dev->base + SSC_DATA_SETUP);
+
+ /* Stop set up time */
+ val = t->stop_setup_time / ns_per_clk;
+ writel(val, i2c_dev->base + SSC_STOP_SETUP);
+
+ /* Bus free time */
+ val = t->bus_free_time / ns_per_clk;
+ writel(val, i2c_dev->base + SSC_BUS_FREE);
+
+ /* Prescalers set up */
+ val = rate / 10000000;
+ writel(val, i2c_dev->base + SSC_PRSCALER);
+ writel(val, i2c_dev->base + SSC_PRSCALER_DATAOUT);
+
+ /* Noise suppression witdh */
+ val = i2c_dev->deglitch.scl_min_width_us * rate / 100000000;
+ writel(val, i2c_dev->base + SSC_NOISE_SUPP_WIDTH);
+
+ /* Noise suppression max output data delay width */
+ val = i2c_dev->deglitch.sda_min_width_us * rate / 100000000;
+ writel(val, i2c_dev->base + SSC_NOISE_SUPP_WIDTH_DATAOUT);
+}
+
+static int st_i2c_wait_free_bus(struct st_i2c_dev *i2c_dev)
+{
+ u32 sta;
+ int i;
+
+ for (i = 0; i < 10; i++) {
+ sta = readl(i2c_dev->base + SSC_STA);
+ if (!(sta & SSC_STA_BUSY))
+ return 0;
+
+ usleep_range(2000, 4000);
+ }
+
+ dev_err(i2c_dev->dev, "bus not free (status = 0x%08x)\n", sta);
+
+ return -EBUSY;
+}
+
+/**
+ * st_i2c_write_tx_fifo() - Write a byte in the Tx FIFO
+ * @i2c_dev: Controller's private data
+ * @byte: Data to write in the Tx FIFO
+ */
+static inline void st_i2c_write_tx_fifo(struct st_i2c_dev *i2c_dev, u8 byte)
+{
+ u16 tbuf = byte << 1;
+
+ writel(tbuf | 1, i2c_dev->base + SSC_TBUF);
+}
+
+/**
+ * st_i2c_wr_fill_tx_fifo() - Fill the Tx FIFO in write mode
+ * @i2c_dev: Controller's private data
+ *
+ * This functions fills the Tx FIFO with I2C transfert buffer when
+ * in write mode.
+ */
+static void st_i2c_wr_fill_tx_fifo(struct st_i2c_dev *i2c_dev)
+{
+ struct st_i2c_client *c = &i2c_dev->client;
+ u32 tx_fstat, sta;
+ int i;
+
+ sta = readl(i2c_dev->base + SSC_STA);
+ if (sta & SSC_STA_TX_FIFO_FULL)
+ return;
+
+ tx_fstat = readl(i2c_dev->base + SSC_TX_FSTAT) & SSC_TX_FSTAT_STATUS;
+
+ if (c->count < (SSC_TXFIFO_SIZE - tx_fstat))
+ i = c->count;
+ else
+ i = SSC_TXFIFO_SIZE - tx_fstat;
+
+ for (; i > 0; i--, c->count--, c->buf++)
+ st_i2c_write_tx_fifo(i2c_dev, *c->buf);
+}
+
+/**
+ * st_i2c_rd_fill_tx_fifo() - Fill the Tx FIFO in read mode
+ * @i2c_dev: Controller's private data
+ *
+ * This functions fills the Tx FIFO with fixed pattern when
+ * in read mode to trigger clock.
+ */
+static void st_i2c_rd_fill_tx_fifo(struct st_i2c_dev *i2c_dev, int max)
+{
+ struct st_i2c_client *c = &i2c_dev->client;
+ u32 tx_fstat, sta;
+ int i;
+
+ sta = readl(i2c_dev->base + SSC_STA);
+ if (sta & SSC_STA_TX_FIFO_FULL)
+ return;
+
+ tx_fstat = readl(i2c_dev->base + SSC_TX_FSTAT) & SSC_TX_FSTAT_STATUS;
+
+ if (max < (SSC_TXFIFO_SIZE - tx_fstat))
+ i = max;
+ else
+ i = SSC_TXFIFO_SIZE - tx_fstat;
+
+ for (; i > 0; i--, c->xfered++)
+ st_i2c_write_tx_fifo(i2c_dev, 0xff);
+}
+
+static void st_i2c_read_rx_fifo(struct st_i2c_dev *i2c_dev)
+{
+ struct st_i2c_client *c = &i2c_dev->client;
+ u32 i, sta;
+ u16 rbuf;
+
+ sta = readl(i2c_dev->base + SSC_STA);
+ if (sta & SSC_STA_RIR) {
+ i = SSC_RXFIFO_SIZE;
+ } else {
+ i = readl(i2c_dev->base + SSC_RX_FSTAT);
+ i &= SSC_RX_FSTAT_STATUS;
+ }
+
+ for (; (i > 0) && (c->count > 0); i--, c->count--) {
+ rbuf = readl(i2c_dev->base + SSC_RBUF) >> 1;
+ *c->buf++ = (u8)rbuf & 0xff;
+ }
+
+ if (i) {
+ dev_err(i2c_dev->dev, "Unexpected %d bytes in rx fifo\n", i);
+ st_i2c_flush_rx_fifo(i2c_dev);
+ }
+}
+
+/**
+ * st_i2c_terminate_xfer() - Send either STOP or REPSTART condition
+ * @i2c_dev: Controller's private data
+ */
+static void st_i2c_terminate_xfer(struct st_i2c_dev *i2c_dev)
+{
+ struct st_i2c_client *c = &i2c_dev->client;
+
+ st_i2c_clr_bits(i2c_dev->base + SSC_IEN, SSC_IEN_TEEN);
+ st_i2c_clr_bits(i2c_dev->base + SSC_I2C, SSC_I2C_STRTG);
+
+ if (c->stop) {
+ st_i2c_set_bits(i2c_dev->base + SSC_IEN, SSC_IEN_STOPEN);
+ st_i2c_set_bits(i2c_dev->base + SSC_I2C, SSC_I2C_STOPG);
+ } else {
+ st_i2c_set_bits(i2c_dev->base + SSC_IEN, SSC_IEN_REPSTRTEN);
+ st_i2c_set_bits(i2c_dev->base + SSC_I2C, SSC_I2C_REPSTRTG);
+ }
+}
+
+/**
+ * st_i2c_handle_write() - Handle FIFO empty interrupt in case of write
+ * @i2c_dev: Controller's private data
+ */
+static void st_i2c_handle_write(struct st_i2c_dev *i2c_dev)
+{
+ struct st_i2c_client *c = &i2c_dev->client;
+
+ st_i2c_flush_rx_fifo(i2c_dev);
+
+ if (!c->count)
+ /* End of xfer, send stop or repstart */
+ st_i2c_terminate_xfer(i2c_dev);
+ else
+ st_i2c_wr_fill_tx_fifo(i2c_dev);
+}
+
+/**
+ * st_i2c_handle_write() - Handle FIFO enmpty interrupt in case of read
+ * @i2c_dev: Controller's private data
+ */
+static void st_i2c_handle_read(struct st_i2c_dev *i2c_dev)
+{
+ struct st_i2c_client *c = &i2c_dev->client;
+ u32 ien;
+
+ /* Trash the address read back */
+ if (!c->xfered) {
+ readl(i2c_dev->base + SSC_RBUF);
+ st_i2c_clr_bits(i2c_dev->base + SSC_I2C, SSC_I2C_TXENB);
+ } else
+ st_i2c_read_rx_fifo(i2c_dev);
+
+ if (!c->count) {
+ /* End of xfer, send stop or repstart */
+ st_i2c_terminate_xfer(i2c_dev);
+ } else if (c->count == 1) {
+ /* Penultimate byte to xfer, disable ACK gen. */
+ st_i2c_clr_bits(i2c_dev->base + SSC_I2C, SSC_I2C_ACKG);
+
+ /* Last received byte is to be handled by NACK interrupt */
+ ien = SSC_IEN_NACKEN | SSC_IEN_ARBLEN;
+ writel(ien, i2c_dev->base + SSC_IEN);
+
+ st_i2c_rd_fill_tx_fifo(i2c_dev, c->count);
+ } else
+ st_i2c_rd_fill_tx_fifo(i2c_dev, c->count - 1);
+}
+
+/**
+ * st_i2c_isr() - Interrupt routine
+ * @irq: interrupt number
+ * @data: Controller's private data
+ */
+static irqreturn_t st_i2c_isr(int irq, void *data)
+{
+ struct st_i2c_dev *i2c_dev = data;
+ struct st_i2c_client *c = &i2c_dev->client;
+ u32 sta, ien;
+ int it;
+
+ ien = readl(i2c_dev->base + SSC_IEN);
+ sta = readl(i2c_dev->base + SSC_STA);
+
+ /* Use __fls() to check error bits first */
+ it = __fls(sta & ien);
+ if (it < 0) {
+ dev_dbg(i2c_dev->dev, "spurious it (sta=0x%04x, ien=0x%04x)\n",
+ sta, ien);
+ return IRQ_NONE;
+ }
+
+ switch (1 << it) {
+ case SSC_STA_TE:
+ if (c->addr & I2C_M_RD)
+ st_i2c_handle_read(i2c_dev);
+ else
+ st_i2c_handle_write(i2c_dev);
+ break;
+
+ case SSC_STA_STOP:
+ case SSC_STA_REPSTRT:
+ writel(0, i2c_dev->base + SSC_IEN);
+ complete(&i2c_dev->complete);
+ break;
+
+ case SSC_STA_NACK:
+ writel(SSC_CLR_NACK, i2c_dev->base + SSC_CLR);
+
+ /* Last received byte handled by NACK interrupt */
+ if ((c->addr & I2C_M_RD) && (c->count == 1) && (c->xfered)) {
+ st_i2c_handle_read(i2c_dev);
+ break;
+ }
+
+ it = SSC_IEN_STOPEN | SSC_IEN_ARBLEN;
+ writel(it, i2c_dev->base + SSC_IEN);
+
+ st_i2c_set_bits(i2c_dev->base + SSC_I2C, SSC_I2C_STOPG);
+ c->result = -EIO;
+ break;
+
+ case SSC_STA_ARBL:
+ writel(SSC_CLR_SSCARBL, i2c_dev->base + SSC_CLR);
+
+ it = SSC_IEN_STOPEN | SSC_IEN_ARBLEN;
+ writel(it, i2c_dev->base + SSC_IEN);
+
+ st_i2c_set_bits(i2c_dev->base + SSC_I2C, SSC_I2C_STOPG);
+ c->result = -EIO;
+ break;
+
+ default:
+ dev_err(i2c_dev->dev,
+ "it %d unhandled (sta=0x%04x)\n", it, sta);
+ }
+
+ return IRQ_HANDLED;
+}
+
+/**
+ * st_i2c_xfer_msg() - Transfer a single I2C message
+ * @i2c_dev: Controller's private data
+ * @msg: I2C message to transfer
+ * @is_first: first message of the sequence
+ * @is_last: last message of the sequence
+ */
+static int st_i2c_xfer_msg(struct st_i2c_dev *i2c_dev, struct i2c_msg *msg,
+ bool is_first, bool is_last)
+{
+ struct st_i2c_client *c = &i2c_dev->client;
+ u32 ctl, i2c, it;
+ unsigned long timeout;
+ int ret;
+
+ c->addr = (u8)(msg->addr << 1);
+ c->addr |= (msg->flags & I2C_M_RD);
+ c->buf = msg->buf;
+ c->count = msg->len;
+ c->xfered = 0;
+ c->result = 0;
+ c->stop = is_last;
+
+ INIT_COMPLETION(i2c_dev->complete);
+
+ ctl = SSC_CTL_EN | SSC_CTL_MS | SSC_CTL_EN_RX_FIFO | SSC_CTL_EN_TX_FIFO;
+ st_i2c_set_bits(i2c_dev->base + SSC_CTL, ctl);
+
+ i2c = SSC_I2C_TXENB;
+ if (c->addr & I2C_M_RD)
+ i2c |= SSC_I2C_ACKG;
+ st_i2c_set_bits(i2c_dev->base + SSC_I2C, i2c);
+
+ /* Write slave address */
+ st_i2c_write_tx_fifo(i2c_dev, c->addr);
+
+ /* Pre-fill Tx fifo with data in case of write */
+ if (!(c->addr & I2C_M_RD))
+ st_i2c_wr_fill_tx_fifo(i2c_dev);
+
+ it = SSC_IEN_NACKEN | SSC_IEN_TEEN | SSC_IEN_ARBLEN;
+ writel(it, i2c_dev->base + SSC_IEN);
+
+ if (is_first) {
+ ret = st_i2c_wait_free_bus(i2c_dev);
+ if (ret)
+ return ret;
+
+ st_i2c_set_bits(i2c_dev->base + SSC_I2C, SSC_I2C_STRTG);
+ }
+
+ timeout = wait_for_completion_timeout(&i2c_dev->complete,
+ i2c_dev->adap.timeout);
+ ret = c->result;
+
+ if (!timeout) {
+ dev_err(i2c_dev->dev, "Write to slave 0x%x timed out\n",
+ c->addr);
+ ret = -ETIMEDOUT;
+ }
+
+ i2c = SSC_I2C_STOPG | SSC_I2C_REPSTRTG;
+ st_i2c_clr_bits(i2c_dev->base + SSC_I2C, i2c);
+
+ writel(SSC_CLR_SSCSTOP | SSC_CLR_REPSTRT, i2c_dev->base + SSC_CLR);
+
+ return ret;
+}
+
+/**
+ * st_i2c_xfer() - Transfer a single I2C message
+ * @i2c_adap: Adapter pointer to the controller
+ * @msgs: Pointer to data to be written.
+ * @num: Number of messages to be executed
+ */
+static int st_i2c_xfer(struct i2c_adapter *i2c_adap,
+ struct i2c_msg msgs[], int num)
+{
+ struct st_i2c_dev *i2c_dev = i2c_get_adapdata(i2c_adap);
+ int ret, i;
+
+ i2c_dev->busy = true;
+
+ ret = clk_prepare_enable(i2c_dev->clk);
+ if (ret) {
+ dev_err(i2c_dev->dev, "Failed to prepare_enable clock\n");
+ return ret;
+ }
+
+ pinctrl_pm_select_default_state(i2c_dev->dev);
+
+ st_i2c_hw_config(i2c_dev);
+
+ for (i = 0; (i < num) && !ret; i++)
+ ret = st_i2c_xfer_msg(i2c_dev, &msgs[i], i == 0, i == num - 1);
+
+ pinctrl_pm_select_idle_state(i2c_dev->dev);
+
+ clk_disable_unprepare(i2c_dev->clk);
+
+ i2c_dev->busy = false;
+
+ return (ret < 0) ? ret : i;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int st_i2c_suspend(struct device *dev)
+{
+ struct platform_device *pdev =
+ container_of(dev, struct platform_device, dev);
+ struct st_i2c_dev *i2c_dev = platform_get_drvdata(pdev);
+
+ if (i2c_dev->busy)
+ return -EBUSY;
+
+ pinctrl_pm_select_sleep_state(dev);
+
+ return 0;
+}
+
+static int st_i2c_resume(struct device *dev)
+{
+ pinctrl_pm_select_default_state(dev);
+ /* Go in idle state if available */
+ pinctrl_pm_select_idle_state(dev);
+
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(st_i2c_pm, st_i2c_suspend, st_i2c_resume);
+#define ST_I2C_PM (&st_i2c_pm)
+#else
+#define ST_I2C_PM NULL
+#endif
+
+static u32 st_i2c_func(struct i2c_adapter *adap)
+{
+ return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static struct i2c_algorithm st_i2c_algo = {
+ .master_xfer = st_i2c_xfer,
+ .functionality = st_i2c_func,
+};
+
+static int st_i2c_of_get_deglitch(struct device_node *np,
+ struct st_i2c_dev *i2c_dev)
+{
+ int ret;
+
+ ret = of_property_read_u32(np, "i2c-min-scl-pulse-width-us",
+ &i2c_dev->deglitch.scl_min_width_us);
+ if ((ret == -ENODATA) || (ret == -EOVERFLOW)) {
+ dev_err(i2c_dev->dev, "i2c-min-scl-pulse-width-us invalid\n");
+ return ret;
+ }
+
+ ret = of_property_read_u32(np, "i2c-min-sda-pulse-width-us",
+ &i2c_dev->deglitch.sda_min_width_us);
+ if ((ret == -ENODATA) || (ret == -EOVERFLOW)) {
+ dev_err(i2c_dev->dev, "i2c-min-sda-pulse-width-us invalid\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int st_i2c_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct st_i2c_dev *i2c_dev;
+ struct resource *res;
+ u32 clk_rate;
+ struct i2c_adapter *adap;
+ int ret;
+
+ i2c_dev = devm_kzalloc(&pdev->dev, sizeof(*i2c_dev), GFP_KERNEL);
+ if (!i2c_dev)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ i2c_dev->base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(i2c_dev->base))
+ return PTR_ERR(i2c_dev->base);
+
+ i2c_dev->irq = irq_of_parse_and_map(np, 0);
+ if (!i2c_dev->irq) {
+ dev_err(&pdev->dev, "IRQ missing or invalid\n");
+ return -EINVAL;
+ }
+
+ i2c_dev->clk = of_clk_get_by_name(np, "ssc");
+ if (IS_ERR(i2c_dev->clk)) {
+ dev_err(&pdev->dev, "Unable to request clock\n");
+ return PTR_ERR(i2c_dev->clk);
+ }
+
+ i2c_dev->mode = I2C_MODE_STANDARD;
+ ret = of_property_read_u32(np, "clock-frequency", &clk_rate);
+ if ((!ret) && (clk_rate == 400000))
+ i2c_dev->mode = I2C_MODE_FAST;
+
+ i2c_dev->dev = &pdev->dev;
+
+ ret = devm_request_irq(&pdev->dev, i2c_dev->irq, st_i2c_isr, 0,
+ pdev->name, i2c_dev);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to request irq %i\n", i2c_dev->irq);
+ return ret;
+ }
+
+ pinctrl_pm_select_default_state(i2c_dev->dev);
+ /* In case idle state available, select it */
+ pinctrl_pm_select_idle_state(i2c_dev->dev);
+
+ ret = st_i2c_of_get_deglitch(np, i2c_dev);
+ if (ret)
+ return ret;
+
+ adap = &i2c_dev->adap;
+ i2c_set_adapdata(adap, i2c_dev);
+ snprintf(adap->name, sizeof(adap->name), "ST I2C(0x%08x)", res->start);
+ adap->owner = THIS_MODULE;
+ adap->timeout = 2 * HZ;
+ adap->retries = 0;
+ adap->class = I2C_CLASS_HWMON | I2C_CLASS_DDC | I2C_CLASS_SPD;
+ adap->algo = &st_i2c_algo;
+ adap->dev.parent = &pdev->dev;
+ adap->dev.of_node = pdev->dev.of_node;
+
+ init_completion(&i2c_dev->complete);
+
+ ret = i2c_add_adapter(adap);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to add adapter\n");
+ return ret;
+ }
+
+ platform_set_drvdata(pdev, i2c_dev);
+
+ dev_info(i2c_dev->dev, "%s initialized\n", adap->name);
+
+ return 0;
+}
+
+static int st_i2c_remove(struct platform_device *pdev)
+{
+ struct st_i2c_dev *i2c_dev = platform_get_drvdata(pdev);
+
+ i2c_del_adapter(&i2c_dev->adap);
+
+ return 0;
+}
+
+static struct of_device_id st_i2c_match[] = {
+ { .compatible = "st,comms-ssc-i2c", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, st_i2c_match);
+
+static struct platform_driver st_i2c_driver = {
+ .driver = {
+ .name = "st-i2c",
+ .owner = THIS_MODULE,
+ .of_match_table = st_i2c_match,
+ .pm = ST_I2C_PM,
+ },
+ .probe = st_i2c_probe,
+ .remove = st_i2c_remove,
+};
+
+module_platform_driver(st_i2c_driver);
+
+MODULE_AUTHOR("Maxime Coquelin <maxime.coquelin-qxv4g6HH51o@public.gmane.org>");
+MODULE_DESCRIPTION("STMicroelectronics I2C driver");
+MODULE_LICENSE("GPL v2");
--
1.7.9.5
^ permalink raw reply related [flat|nested] 17+ messages in thread
* [PATCH 2/4] ARM: STi: Supply I2C configuration to STiH416 SoC
2013-10-01 10:39 [PATCH v3 0/4] Add I2C support to ST SoCs Maxime COQUELIN
[not found] ` <1380623952-4252-1-git-send-email-maxime.coquelin-qxv4g6HH51o@public.gmane.org>
@ 2013-10-01 10:39 ` Maxime COQUELIN
2013-10-01 10:39 ` [PATCH 4/4] ARM: STi: Add I2C config to B2000 and B2020 boards Maxime COQUELIN
2 siblings, 0 replies; 17+ messages in thread
From: Maxime COQUELIN @ 2013-10-01 10:39 UTC (permalink / raw)
To: Wolfram Sang, srinivas.kandagatla, Rob Herring, Pawel Moll,
Mark Rutland, Stephen Warren, Ian Campbell, Rob Landley,
Russell King, Grant Likely, devicetree, linux-doc, linux-kernel,
linux-arm-kernel, linux-i2c
Cc: stephen.gallimore, stuart.menefy, Lee Jones, gabriel.fernandez,
kernel, Maxime Coquelin
This patch supplies I2C configuration to STiH416 SoC.
Cc: Srinivas Kandagatla <srinivas.kandagatla@st.com>
Signed-off-by: Maxime Coquelin <maxime.coquelin@st.com>
---
arch/arm/boot/dts/stih416-pinctrl.dtsi | 35 +++++++++++++++++++++
arch/arm/boot/dts/stih416.dtsi | 53 ++++++++++++++++++++++++++++++++
2 files changed, 88 insertions(+)
diff --git a/arch/arm/boot/dts/stih416-pinctrl.dtsi b/arch/arm/boot/dts/stih416-pinctrl.dtsi
index 0f246c9..b29ff4b 100644
--- a/arch/arm/boot/dts/stih416-pinctrl.dtsi
+++ b/arch/arm/boot/dts/stih416-pinctrl.dtsi
@@ -97,6 +97,24 @@
};
};
};
+
+ sbc_i2c0 {
+ pinctrl_sbc_i2c0_default: sbc_i2c0-default {
+ st,pins {
+ sda = <&PIO4 6 ALT1 BIDIR>;
+ scl = <&PIO4 5 ALT1 BIDIR>;
+ };
+ };
+ };
+
+ sbc_i2c1 {
+ pinctrl_sbc_i2c1_default: sbc_i2c1-default {
+ st,pins {
+ sda = <&PIO3 2 ALT2 BIDIR>;
+ scl = <&PIO3 1 ALT2 BIDIR>;
+ };
+ };
+ };
};
pin-controller-front {
@@ -175,6 +193,23 @@
};
};
+ i2c0 {
+ pinctrl_i2c0_default: i2c0-default {
+ st,pins {
+ sda = <&PIO9 3 ALT1 BIDIR>;
+ scl = <&PIO9 2 ALT1 BIDIR>;
+ };
+ };
+ };
+
+ i2c1 {
+ pinctrl_i2c1_default: i2c1-default {
+ st,pins {
+ sda = <&PIO12 1 ALT1 BIDIR>;
+ scl = <&PIO12 0 ALT1 BIDIR>;
+ };
+ };
+ };
};
pin-controller-rear {
diff --git a/arch/arm/boot/dts/stih416.dtsi b/arch/arm/boot/dts/stih416.dtsi
index 1a0326e..e8eb251 100644
--- a/arch/arm/boot/dts/stih416.dtsi
+++ b/arch/arm/boot/dts/stih416.dtsi
@@ -9,6 +9,7 @@
#include "stih41x.dtsi"
#include "stih416-clock.dtsi"
#include "stih416-pinctrl.dtsi"
+#include <dt-bindings/interrupt-controller/arm-gic.h>
/ {
L2: cache-controller {
compatible = "arm,pl310-cache";
@@ -92,5 +93,57 @@
pinctrl-0 = <&pinctrl_sbc_serial1>;
clocks = <&CLK_SYSIN>;
};
+
+ i2c@fed40000 {
+ compatible = "st,comms-ssc-i2c";
+ reg = <0xfed40000 0x110>;
+ interrupts = <GIC_SPI 187 IRQ_TYPE_EDGE_RISING>;
+ clocks = <&CLK_S_ICN_REG_0>;
+ clock-names = "ssc";
+ clock-frequency = <400000>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&pinctrl_i2c0_default>;
+
+ status = "disabled";
+ };
+
+ i2c@fed41000 {
+ compatible = "st,comms-ssc-i2c";
+ reg = <0xfed41000 0x110>;
+ interrupts = <GIC_SPI 188 IRQ_TYPE_EDGE_RISING>;
+ clocks = <&CLK_S_ICN_REG_0>;
+ clock-names = "ssc";
+ clock-frequency = <400000>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&pinctrl_i2c1_default>;
+
+ status = "disabled";
+ };
+
+ i2c@fe540000 {
+ compatible = "st,comms-ssc-i2c";
+ reg = <0xfe540000 0x110>;
+ interrupts = <GIC_SPI 206 IRQ_TYPE_EDGE_RISING>;
+ clocks = <&CLK_SYSIN>;
+ clock-names = "ssc";
+ clock-frequency = <400000>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&pinctrl_sbc_i2c0_default>;
+
+ status = "disabled";
+ };
+
+ i2c@fe541000 {
+ compatible = "st,comms-ssc-i2c";
+ reg = <0xfe541000 0x110>;
+ interrupts = <GIC_SPI 207 IRQ_TYPE_EDGE_RISING>;
+ clocks = <&CLK_SYSIN>;
+ clock-names = "ssc";
+ clock-frequency = <400000>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&pinctrl_sbc_i2c1_default>;
+
+ status = "disabled";
+ };
};
};
--
1.7.9.5
^ permalink raw reply related [flat|nested] 17+ messages in thread
* [PATCH 3/4] ARM: STi: Supply I2C configuration to STiH415 SoC
[not found] ` <1380623952-4252-1-git-send-email-maxime.coquelin-qxv4g6HH51o@public.gmane.org>
2013-10-01 10:39 ` [PATCH 1/4] i2c: busses: i2c-st: Add ST I2C controller Maxime COQUELIN
@ 2013-10-01 10:39 ` Maxime COQUELIN
1 sibling, 0 replies; 17+ messages in thread
From: Maxime COQUELIN @ 2013-10-01 10:39 UTC (permalink / raw)
To: Wolfram Sang, srinivas.kandagatla-qxv4g6HH51o, Rob Herring,
Pawel Moll, Mark Rutland, Stephen Warren, Ian Campbell,
Rob Landley, Russell King, Grant Likely,
devicetree-u79uwXL29TY76Z2rM5mHXA,
linux-doc-u79uwXL29TY76Z2rM5mHXA,
linux-kernel-u79uwXL29TY76Z2rM5mHXA,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r,
linux-i2c-u79uwXL29TY76Z2rM5mHXA
Cc: stephen.gallimore-qxv4g6HH51o, stuart.menefy-qxv4g6HH51o,
Lee Jones, gabriel.fernandez-qxv4g6HH51o,
kernel-F5mvAk5X5gdBDgjK7y7TUQ, Maxime Coquelin
This patch supplies I2C configuration to STiH415 SoC.
Cc: Srinivas Kandagatla <srinivas.kandagatla-qxv4g6HH51o@public.gmane.org>
Signed-off-by: Maxime Coquelin <maxime.coquelin-qxv4g6HH51o@public.gmane.org>
---
arch/arm/boot/dts/stih415-pinctrl.dtsi | 36 ++++++++++++++++++++++
arch/arm/boot/dts/stih415.dtsi | 53 ++++++++++++++++++++++++++++++++
2 files changed, 89 insertions(+)
diff --git a/arch/arm/boot/dts/stih415-pinctrl.dtsi b/arch/arm/boot/dts/stih415-pinctrl.dtsi
index 1d322b2..e56449d 100644
--- a/arch/arm/boot/dts/stih415-pinctrl.dtsi
+++ b/arch/arm/boot/dts/stih415-pinctrl.dtsi
@@ -86,6 +86,24 @@
};
};
};
+
+ sbc_i2c0 {
+ pinctrl_sbc_i2c0_default: sbc_i2c0-default {
+ st,pins {
+ sda = <&PIO4 6 ALT1 BIDIR>;
+ scl = <&PIO4 5 ALT1 BIDIR>;
+ };
+ };
+ };
+
+ sbc_i2c1 {
+ pinctrl_sbc_i2c1_default: sbc_i2c1-default {
+ st,pins {
+ sda = <&PIO3 2 ALT2 BIDIR>;
+ scl = <&PIO3 1 ALT2 BIDIR>;
+ };
+ };
+ };
};
pin-controller-front {
@@ -143,6 +161,24 @@
reg = <0x7000 0x100>;
st,bank-name = "PIO12";
};
+
+ i2c0 {
+ pinctrl_i2c0_default: i2c0-default {
+ st,pins {
+ sda = <&PIO9 3 ALT1 BIDIR>;
+ scl = <&PIO9 2 ALT1 BIDIR>;
+ };
+ };
+ };
+
+ i2c1 {
+ pinctrl_i2c1_default: i2c1-default {
+ st,pins {
+ sda = <&PIO12 1 ALT1 BIDIR>;
+ scl = <&PIO12 0 ALT1 BIDIR>;
+ };
+ };
+ };
};
pin-controller-rear {
diff --git a/arch/arm/boot/dts/stih415.dtsi b/arch/arm/boot/dts/stih415.dtsi
index 74ab8de..eb4fccb 100644
--- a/arch/arm/boot/dts/stih415.dtsi
+++ b/arch/arm/boot/dts/stih415.dtsi
@@ -9,6 +9,7 @@
#include "stih41x.dtsi"
#include "stih415-clock.dtsi"
#include "stih415-pinctrl.dtsi"
+#include <dt-bindings/interrupt-controller/arm-gic.h>
/ {
L2: cache-controller {
@@ -83,5 +84,57 @@
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_sbc_serial1>;
};
+
+ i2c@fed40000 {
+ compatible = "st,comms-ssc-i2c";
+ reg = <0xfed40000 0x110>;
+ interrupts = <GIC_SPI 187 IRQ_TYPE_EDGE_RISING>;
+ clocks = <&CLKS_ICN_REG_0>;
+ clock-names = "ssc";
+ clock-frequency = <400000>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&pinctrl_i2c0_default>;
+
+ status = "disabled";
+ };
+
+ i2c@fed41000 {
+ compatible = "st,comms-ssc-i2c";
+ reg = <0xfed41000 0x110>;
+ interrupts = <GIC_SPI 188 IRQ_TYPE_EDGE_RISING>;
+ clocks = <&CLKS_ICN_REG_0>;
+ clock-names = "ssc";
+ clock-frequency = <400000>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&pinctrl_i2c1_default>;
+
+ status = "disabled";
+ };
+
+ i2c@fe540000 {
+ compatible = "st,comms-ssc-i2c";
+ reg = <0xfe540000 0x110>;
+ interrupts = <GIC_SPI 206 IRQ_TYPE_EDGE_RISING>;
+ clocks = <&CLK_SYSIN>;
+ clock-names = "ssc";
+ clock-frequency = <400000>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&pinctrl_sbc_i2c0_default>;
+
+ status = "disabled";
+ };
+
+ i2c@fe541000 {
+ compatible = "st,comms-ssc-i2c";
+ reg = <0xfe541000 0x110>;
+ interrupts = <GIC_SPI 207 IRQ_TYPE_EDGE_RISING>;
+ clocks = <&CLK_SYSIN>;
+ clock-names = "ssc";
+ clock-frequency = <400000>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&pinctrl_sbc_i2c1_default>;
+
+ status = "disabled";
+ };
};
};
--
1.7.9.5
^ permalink raw reply related [flat|nested] 17+ messages in thread
* [PATCH 4/4] ARM: STi: Add I2C config to B2000 and B2020 boards
2013-10-01 10:39 [PATCH v3 0/4] Add I2C support to ST SoCs Maxime COQUELIN
[not found] ` <1380623952-4252-1-git-send-email-maxime.coquelin-qxv4g6HH51o@public.gmane.org>
2013-10-01 10:39 ` [PATCH 2/4] ARM: STi: Supply I2C configuration to STiH416 SoC Maxime COQUELIN
@ 2013-10-01 10:39 ` Maxime COQUELIN
2 siblings, 0 replies; 17+ messages in thread
From: Maxime COQUELIN @ 2013-10-01 10:39 UTC (permalink / raw)
To: Wolfram Sang, srinivas.kandagatla, Rob Herring, Pawel Moll,
Mark Rutland, Stephen Warren, Ian Campbell, Rob Landley,
Russell King, Grant Likely, devicetree, linux-doc, linux-kernel,
linux-arm-kernel, linux-i2c
Cc: stephen.gallimore, stuart.menefy, Lee Jones, gabriel.fernandez,
kernel, Maxime Coquelin
This patch supplies I2C configuration to B2000 and B2020
based on either STiH415 or STiH416 SoCs.
Cc: Srinivas Kandagatla <srinivas.kandagatla@st.com>
Signed-off-by: Maxime Coquelin <maxime.coquelin@st.com>
---
arch/arm/boot/dts/stih41x-b2000.dtsi | 9 +++++++++
arch/arm/boot/dts/stih41x-b2020.dtsi | 22 ++++++++++++++++++++++
2 files changed, 31 insertions(+)
diff --git a/arch/arm/boot/dts/stih41x-b2000.dtsi b/arch/arm/boot/dts/stih41x-b2000.dtsi
index 8e694d2..1e6aa92 100644
--- a/arch/arm/boot/dts/stih41x-b2000.dtsi
+++ b/arch/arm/boot/dts/stih41x-b2000.dtsi
@@ -37,5 +37,14 @@
};
};
+ /* HDMI Tx I2C */
+ i2c@fed41000 {
+ /* HDMI V1.3a supports Standard mode only */
+ clock-frequency = <100000>;
+ i2c-min-scl-pulse-width-us = <0>;
+ i2c-min-sda-pulse-width-us = <5>;
+
+ status = "okay";
+ };
};
};
diff --git a/arch/arm/boot/dts/stih41x-b2020.dtsi b/arch/arm/boot/dts/stih41x-b2020.dtsi
index 133e181..0ef0a69 100644
--- a/arch/arm/boot/dts/stih41x-b2020.dtsi
+++ b/arch/arm/boot/dts/stih41x-b2020.dtsi
@@ -38,5 +38,27 @@
default-state = "off";
};
};
+
+ i2c@fed40000 {
+ status = "okay";
+ };
+
+ /* HDMI Tx I2C */
+ i2c@fed41000 {
+ /* HDMI V1.3a supports Standard mode only */
+ clock-frequency = <100000>;
+ i2c-min-scl-pulse-width-us = <0>;
+ i2c-min-sda-pulse-width-us = <5>;
+
+ status = "okay";
+ };
+
+ i2c@fe540000 {
+ status = "okay";
+ };
+
+ i2c@fe541000 {
+ status = "okay";
+ };
};
};
--
1.7.9.5
^ permalink raw reply related [flat|nested] 17+ messages in thread
* Re: [PATCH 1/4] i2c: busses: i2c-st: Add ST I2C controller
[not found] ` <1380623952-4252-2-git-send-email-maxime.coquelin-qxv4g6HH51o@public.gmane.org>
@ 2013-10-01 20:45 ` Stephen Warren
2013-10-02 8:36 ` Maxime COQUELIN
0 siblings, 1 reply; 17+ messages in thread
From: Stephen Warren @ 2013-10-01 20:45 UTC (permalink / raw)
To: Maxime COQUELIN
Cc: Wolfram Sang, srinivas.kandagatla-qxv4g6HH51o, Rob Herring,
Pawel Moll, Mark Rutland, Ian Campbell, Rob Landley, Russell King,
Grant Likely, devicetree-u79uwXL29TY76Z2rM5mHXA,
linux-doc-u79uwXL29TY76Z2rM5mHXA,
linux-kernel-u79uwXL29TY76Z2rM5mHXA,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r,
linux-i2c-u79uwXL29TY76Z2rM5mHXA, stephen.gallimore-qxv4g6HH51o,
stuart.menefy-qxv4g6HH51o, Lee Jones,
gabriel.fernandez-qxv4g6HH51o, kernel-F5mvAk5X5gdBDgjK7y7TUQ
On 10/01/2013 04:39 AM, Maxime COQUELIN wrote:
> This patch adds support to SSC (Synchronous Serial Controller)
> I2C driver. This IP also supports SPI protocol, but this is not
> the aim of this driver.
>
> This IP is embedded in all ST SoCs for Set-top box platorms, and
> supports I2C Standard and Fast modes.
> diff --git a/Documentation/devicetree/bindings/i2c/i2c-st.txt b/Documentation/devicetree/bindings/i2c/i2c-st.txt
> +Required properties :
> +- clocks : phandle to the I2C clock source
> +- clock-names : from common clock binding: Shall be "ssc"
I'd prefer to define that as:
clock-names: Must contain "ssc".
clocks: Must contain an entry for each name in clock-names. See the
common clock bindings.
That way, it makes it clear that clock-names is the primary lookup
mechanism, rather than some auxiliary documentation.
> +Recommended properties :
> +- clock-frequency : Desired I2C bus clock frequency in Hz. Otherwise
s/Otherwise/If not specified,/
> + the default 100 kHz frequency will be used. As only Normal and Fast modes
> + are supported, possible values are 100000 and 400000.
I think that's just optional. Since there's a well-defined sensible
default, there's no need to recommend it.
> +Optional properties :
> +- i2c-min-scl-pulse-width-us : The minimum valid SCL pulse width that is allowed
> + through the deglitch circuit. In units of us.
> +- i2c-min-sda-pulse-width-us : The minimum valid SDA pulse width that is allowed
> + through the deglitch circuit. In units of us.
Are those properties specific to this binding, or intended to be
generic? If specific to this binding, a vendor prefix should be present
in the property name. If not, you probably want to document the
properties in some common file.
> +Examples :
s/Examples/Example/ since there's just one.
> +i2c0: i2c@fed40000 {
> + compatible = "st,comms-ssc-i2c";
> + reg = <0xfed40000 0x110>;
> + interrupts = <GIC_SPI 187 IRQ_TYPE_EDGE_RISING>;
> + clocks = <&CLK_S_ICN_REG_0>;
> + clock-names = "ssc";
> + clock-frequency = <400000>;
> + pinctrl-names = "default";
> + pinctrl-0 = <&pinctrl_i2c0_default>;
That wasn't mentioned in the binding definition. You'd probably want to
document the requirement for those two properties by saying something like:
A pinctrl state named "default" must be defined, using the bindings in
../pinctrl/pinctrl-binding.txt.
^ permalink raw reply [flat|nested] 17+ messages in thread
* Re: [PATCH 1/4] i2c: busses: i2c-st: Add ST I2C controller
2013-10-01 20:45 ` Stephen Warren
@ 2013-10-02 8:36 ` Maxime COQUELIN
2013-10-02 9:02 ` Wolfram Sang
0 siblings, 1 reply; 17+ messages in thread
From: Maxime COQUELIN @ 2013-10-02 8:36 UTC (permalink / raw)
To: Stephen Warren
Cc: Mark Rutland, devicetree@vger.kernel.org, Russell King,
kernel@stlinux.com, Pawel Moll, Ian Campbell, Wolfram Sang,
Srinivas KANDAGATLA, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org, Rob Herring, Stephen GALLIMORE,
Stuart MENEFY, linux-i2c@vger.kernel.org, Rob Landley,
Grant Likely, Lee Jones, Gabriel FERNANDEZ,
linux-arm-kernel@lists.infradead.org
On 10/01/2013 10:45 PM, Stephen Warren wrote:
> On 10/01/2013 04:39 AM, Maxime COQUELIN wrote:
>> This patch adds support to SSC (Synchronous Serial Controller)
>> I2C driver. This IP also supports SPI protocol, but this is not
>> the aim of this driver.
>>
>> This IP is embedded in all ST SoCs for Set-top box platorms, and
>> supports I2C Standard and Fast modes.
>> diff --git a/Documentation/devicetree/bindings/i2c/i2c-st.txt b/Documentation/devicetree/bindings/i2c/i2c-st.txt
>> +Required properties :
>> +- clocks : phandle to the I2C clock source
>> +- clock-names : from common clock binding: Shall be "ssc"
> I'd prefer to define that as:
>
> clock-names: Must contain "ssc".
> clocks: Must contain an entry for each name in clock-names. See the
> common clock bindings.
>
> That way, it makes it clear that clock-names is the primary lookup
> mechanism, rather than some auxiliary documentation.
OK. This will be done in next series.
>
>> +Recommended properties :
>> +- clock-frequency : Desired I2C bus clock frequency in Hz. Otherwise
> s/Otherwise/If not specified,/
Done.
>
>> + the default 100 kHz frequency will be used. As only Normal and Fast modes
>> + are supported, possible values are 100000 and 400000.
> I think that's just optional. Since there's a well-defined sensible
> default, there's no need to recommend it.
OK, I move it to optional.
>> +Optional properties :
>> +- i2c-min-scl-pulse-width-us : The minimum valid SCL pulse width that is allowed
>> + through the deglitch circuit. In units of us.
>> +- i2c-min-sda-pulse-width-us : The minimum valid SDA pulse width that is allowed
>> + through the deglitch circuit. In units of us.
> Are those properties specific to this binding, or intended to be
> generic? If specific to this binding, a vendor prefix should be present
> in the property name. If not, you probably want to document the
> properties in some common file.
Ok.
In last revision, I put this properties as specific to this binding.
Wolfram proposed to make this generic, but it looks like this IP is the
only one
needing such properties.
Wolfram, what would you advise?
If you still prefer to make this properties generics, in which file should I
document it? I don't see any common i2c binding document for now.
>
>> +Examples :
> s/Examples/Example/ since there's just one.
Ok.
>
>> +i2c0: i2c@fed40000 {
>> + compatible = "st,comms-ssc-i2c";
>> + reg = <0xfed40000 0x110>;
>> + interrupts = <GIC_SPI 187 IRQ_TYPE_EDGE_RISING>;
>> + clocks = <&CLK_S_ICN_REG_0>;
>> + clock-names = "ssc";
>> + clock-frequency = <400000>;
>> + pinctrl-names = "default";
>> + pinctrl-0 = <&pinctrl_i2c0_default>;
> That wasn't mentioned in the binding definition. You'd probably want to
> document the requirement for those two properties by saying something like:
>
> A pinctrl state named "default" must be defined, using the bindings in
> ../pinctrl/pinctrl-binding.txt.
Ok. I will also add the "sleep" state in the optional definitions.
Thanks for the review Stephen.
Regards,
Maxime
^ permalink raw reply [flat|nested] 17+ messages in thread
* Re: [PATCH 1/4] i2c: busses: i2c-st: Add ST I2C controller
2013-10-02 8:36 ` Maxime COQUELIN
@ 2013-10-02 9:02 ` Wolfram Sang
2013-10-02 9:35 ` Maxime COQUELIN
0 siblings, 1 reply; 17+ messages in thread
From: Wolfram Sang @ 2013-10-02 9:02 UTC (permalink / raw)
To: Maxime COQUELIN
Cc: Stephen Warren, Srinivas KANDAGATLA, Rob Herring, Pawel Moll,
Mark Rutland, Ian Campbell, Rob Landley, Russell King,
Grant Likely, devicetree@vger.kernel.org,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, linux-i2c@vger.kernel.org,
Stephen GALLIMORE, Stuart MENEFY, Lee Jones, Gabriel FERNANDEZ,
kernel@stlinux.com
[-- Attachment #1: Type: text/plain, Size: 1456 bytes --]
> >> +Optional properties :
> >> +- i2c-min-scl-pulse-width-us : The minimum valid SCL pulse width that is allowed
> >> + through the deglitch circuit. In units of us.
> >> +- i2c-min-sda-pulse-width-us : The minimum valid SDA pulse width that is allowed
> >> + through the deglitch circuit. In units of us.
> > Are those properties specific to this binding, or intended to be
> > generic? If specific to this binding, a vendor prefix should be present
> > in the property name. If not, you probably want to document the
> > properties in some common file.
> Ok.
> In last revision, I put this properties as specific to this binding.
> Wolfram proposed to make this generic, but it looks like this IP is the
> only one
> needing such properties.
>
> Wolfram, what would you advise?
It might be the only SoC now, but I could imagine that other will have
something similar in the future. I am not perfectly sure, though. So, I
asked for opinions from DT experts when I suggested those bindings. We
could start with vendor specific bindings and generalize them later if
similar ones appear. Yet my experience is that old drivers rarely get
converted to the new bindings.
> If you still prefer to make this properties generics, in which file should I
> document it? I don't see any common i2c binding document for now.
Yeah, it is missing sadly. That's on my todo-list, like many other
things...
Regards,
Wolfram
[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 836 bytes --]
^ permalink raw reply [flat|nested] 17+ messages in thread
* Re: [PATCH 1/4] i2c: busses: i2c-st: Add ST I2C controller
2013-10-02 9:02 ` Wolfram Sang
@ 2013-10-02 9:35 ` Maxime COQUELIN
[not found] ` <524BE8FB.40000-qxv4g6HH51o@public.gmane.org>
0 siblings, 1 reply; 17+ messages in thread
From: Maxime COQUELIN @ 2013-10-02 9:35 UTC (permalink / raw)
To: Wolfram Sang
Cc: Stephen Warren, Srinivas KANDAGATLA, Rob Herring, Pawel Moll,
Mark Rutland, Ian Campbell, Rob Landley, Russell King,
Grant Likely, devicetree@vger.kernel.org,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, linux-i2c@vger.kernel.org,
Stephen GALLIMORE, Stuart MENEFY, Lee Jones, Gabriel FERNANDEZ,
kernel@stlinux.com
On 10/02/2013 11:02 AM, Wolfram Sang wrote:
>>>> +Optional properties :
>>>> +- i2c-min-scl-pulse-width-us : The minimum valid SCL pulse width that is allowed
>>>> + through the deglitch circuit. In units of us.
>>>> +- i2c-min-sda-pulse-width-us : The minimum valid SDA pulse width that is allowed
>>>> + through the deglitch circuit. In units of us.
>>> Are those properties specific to this binding, or intended to be
>>> generic? If specific to this binding, a vendor prefix should be present
>>> in the property name. If not, you probably want to document the
>>> properties in some common file.
>> Ok.
>> In last revision, I put this properties as specific to this binding.
>> Wolfram proposed to make this generic, but it looks like this IP is the
>> only one
>> needing such properties.
>>
>> Wolfram, what would you advise?
> It might be the only SoC now, but I could imagine that other will have
> something similar in the future. I am not perfectly sure, though. So, I
> asked for opinions from DT experts when I suggested those bindings. We
> could start with vendor specific bindings and generalize them later if
> similar ones appear. Yet my experience is that old drivers rarely get
> converted to the new bindings.
Ok.
But if I start with vendor specific bindings, we will have to support it
forever, right?
>
>> If you still prefer to make this properties generics, in which file should I
>> document it? I don't see any common i2c binding document for now.
> Yeah, it is missing sadly. That's on my todo-list, like many other
> things...
OK :-)
Thanks,
Maxime
^ permalink raw reply [flat|nested] 17+ messages in thread
* Re: [PATCH 1/4] i2c: busses: i2c-st: Add ST I2C controller
[not found] ` <524BE8FB.40000-qxv4g6HH51o@public.gmane.org>
@ 2013-10-02 13:56 ` Maxime COQUELIN
0 siblings, 0 replies; 17+ messages in thread
From: Maxime COQUELIN @ 2013-10-02 13:56 UTC (permalink / raw)
To: Pawel Moll
Cc: Wolfram Sang, Stephen Warren, Srinivas KANDAGATLA, Rob Herring,
Mark Rutland, Ian Campbell, Rob Landley, Russell King,
Grant Likely, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Stephen GALLIMORE, Stuart MENEFY, Lee Jones, Gabriel FERNANDEZ,
kernel-F5mvAk5X5gdBDgjK7y7TUQ@public.gmane.org
Hi Pawel,
On 10/02/2013 11:35 AM, Maxime Coquelin wrote:
>
> On 10/02/2013 11:02 AM, Wolfram Sang wrote:
>>>>> +Optional properties :
>>>>> +- i2c-min-scl-pulse-width-us : The minimum valid SCL pulse width
>>>>> that is allowed
>>>>> + through the deglitch circuit. In units of us.
>>>>> +- i2c-min-sda-pulse-width-us : The minimum valid SDA pulse width
>>>>> that is allowed
>>>>> + through the deglitch circuit. In units of us.
>>>> Are those properties specific to this binding, or intended to be
>>>> generic? If specific to this binding, a vendor prefix should be
>>>> present
>>>> in the property name. If not, you probably want to document the
>>>> properties in some common file.
>>> Ok.
>>> In last revision, I put this properties as specific to this binding.
>>> Wolfram proposed to make this generic, but it looks like this IP is the
>>> only one
>>> needing such properties.
>>>
>>> Wolfram, what would you advise?
>> It might be the only SoC now, but I could imagine that other will have
>> something similar in the future. I am not perfectly sure, though. So, I
>> asked for opinions from DT experts when I suggested those bindings. We
>> could start with vendor specific bindings and generalize them later if
>> similar ones appear. Yet my experience is that old drivers rarely get
>> converted to the new bindings.
> Ok.
> But if I start with vendor specific bindings, we will have to support it
> forever, right?
I would be glad to have your opinion on this.
Since there are no other vendors currently having this feature,
should we put these properties vendor specific?
Or put them generic in case of someone has the same feature in the future?
Thanks,
Maxime
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^ permalink raw reply [flat|nested] 17+ messages in thread
end of thread, other threads:[~2013-10-02 13:56 UTC | newest]
Thread overview: 17+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2013-10-01 10:39 [PATCH v3 0/4] Add I2C support to ST SoCs Maxime COQUELIN
[not found] ` <1380623952-4252-1-git-send-email-maxime.coquelin-qxv4g6HH51o@public.gmane.org>
2013-10-01 10:39 ` [PATCH 1/4] i2c: busses: i2c-st: Add ST I2C controller Maxime COQUELIN
[not found] ` <1380623952-4252-2-git-send-email-maxime.coquelin-qxv4g6HH51o@public.gmane.org>
2013-10-01 20:45 ` Stephen Warren
2013-10-02 8:36 ` Maxime COQUELIN
2013-10-02 9:02 ` Wolfram Sang
2013-10-02 9:35 ` Maxime COQUELIN
[not found] ` <524BE8FB.40000-qxv4g6HH51o@public.gmane.org>
2013-10-02 13:56 ` Maxime COQUELIN
2013-10-01 10:39 ` [PATCH 3/4] ARM: STi: Supply I2C configuration to STiH415 SoC Maxime COQUELIN
2013-10-01 10:39 ` [PATCH 2/4] ARM: STi: Supply I2C configuration to STiH416 SoC Maxime COQUELIN
2013-10-01 10:39 ` [PATCH 4/4] ARM: STi: Add I2C config to B2000 and B2020 boards Maxime COQUELIN
-- strict thread matches above, loose matches on Subject: below --
2013-09-18 10:01 [PATCH 0/4] Add I2C support to ST SoCs Maxime COQUELIN
2013-09-18 10:01 ` [PATCH 1/4] i2c: busses: i2c-st: Add ST I2C controller Maxime COQUELIN
2013-09-18 12:47 ` Gabriel FERNANDEZ
[not found] ` <5239A0ED.6010606-qxv4g6HH51o@public.gmane.org>
2013-09-23 20:55 ` Stephen Warren
[not found] ` <1379498483-4236-2-git-send-email-maxime.coquelin-qxv4g6HH51o@public.gmane.org>
2013-09-23 21:06 ` Stephen Warren
[not found] ` <5240AD6E.4090905-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2013-09-24 15:38 ` Maxime COQUELIN
[not found] ` <5241B1FA.6020500-qxv4g6HH51o@public.gmane.org>
2013-09-24 15:59 ` Wolfram Sang
2013-09-26 9:30 ` Maxime COQUELIN
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