[U-Boot] [PATCH 1/9] i2c driver support for SPEAr SoCs

[Vipin KUMAR <vipin.kumar@st.com>]

Signed-off-by: Vipin <vipin.kumar@st.com>
---
 drivers/i2c/Makefile                 |    1 +
 drivers/i2c/spr_i2c.c                |  321 ++++++++++++++++++++++++++++++++++
 include/asm-arm/arch-spear/spr_i2c.h |  143 +++++++++++++++
 3 files changed, 465 insertions(+), 0 deletions(-)
 mode change 100644 => 100755 drivers/i2c/Makefile
 create mode 100755 drivers/i2c/spr_i2c.c
 create mode 100755 include/asm-arm/arch-spear/spr_i2c.h

diff --git a/drivers/i2c/Makefile b/drivers/i2c/Makefile
old mode 100644
new mode 100755
index b860e89..a65543f
--- a/drivers/i2c/Makefile
+++ b/drivers/i2c/Makefile
@@ -38,6 +38,7 @@ COBJS-$(CONFIG_DRIVER_S3C24X0_I2C) += s3c24x0_i2c.o
 COBJS-$(CONFIG_S3C44B0_I2C) += s3c44b0_i2c.o
 COBJS-$(CONFIG_SOFT_I2C) += soft_i2c.o
 COBJS-$(CONFIG_TSI108_I2C) += tsi108_i2c.o
+COBJS-$(CONFIG_SPEARI2C) += spr_i2c.o
 
 COBJS	:= $(COBJS-y)
 SRCS	:= $(COBJS:.o=.c)
diff --git a/drivers/i2c/spr_i2c.c b/drivers/i2c/spr_i2c.c
new file mode 100755
index 0000000..43a9f35
--- /dev/null
+++ b/drivers/i2c/spr_i2c.c
@@ -0,0 +1,321 @@
+/*
+ * (C) Copyright 2009
+ * Vipin Kumar, ST Micoelectronics, vipin.kumar at st.com.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch/spr_i2c.h>
+
+static struct i2c_regs *const i2c_regs_p =
+		(struct i2c_regs *)CONFIG_SYS_I2C_BASE;
+
+/**
+ * i2c_setfreq - Set i2c working mode frequency
+ *
+ * Set i2c working mode frequency
+ */
+static void i2c_setfreq(unsigned int high, unsigned int low)
+{
+	unsigned int hcnt, lcnt;
+
+	hcnt = (IC_CLK * high) / NANO_TO_MICRO;
+	writel(hcnt, &i2c_regs_p->ic_fs_scl_hcnt);
+
+	lcnt = (IC_CLK * low) / NANO_TO_MICRO;
+	writel(lcnt, &i2c_regs_p->ic_fs_scl_lcnt);
+}
+
+/**
+ * set_speed - Set the i2c speed mode (standard, high, fast)
+ * @i2c_spd:	required i2c speed mode
+ *
+ * Set the i2c speed mode (standard, high, fast)
+ */
+static void set_speed(int i2c_spd)
+{
+	unsigned int cntl;
+
+	if (i2c_spd == IC_SPEED_MODE_MAX) {
+		cntl = readl(&i2c_regs_p->ic_con);
+		cntl |= IC_CON_SPH | IC_CON_SPL;
+		writel(cntl, &i2c_regs_p->ic_con);
+		i2c_setfreq(MIN_HS_SCL_HIGHTIME, MIN_HS_SCL_LOWTIME);
+	} else if (i2c_spd == IC_SPEED_MODE_FAST) {
+		cntl = readl(&i2c_regs_p->ic_con);
+		cntl |= IC_CON_SPH;
+		cntl &= ~IC_CON_SPL;
+		writel(cntl, &i2c_regs_p->ic_con);
+		i2c_setfreq(MIN_FS_SCL_HIGHTIME, MIN_FS_SCL_LOWTIME);
+	} else if (i2c_spd == IC_SPEED_MODE_STANDARD) {
+		cntl = readl(&i2c_regs_p->ic_con);
+		cntl |= IC_CON_SPF;
+		cntl &= ~IC_CON_SPL;
+		writel(cntl, &i2c_regs_p->ic_con);
+		i2c_setfreq(MIN_SS_SCL_HIGHTIME, MIN_SS_SCL_LOWTIME);
+	}
+}
+
+/**
+ * i2c_set_bus_speed - Set the i2c speed
+ * @speed:	required i2c speed
+ *
+ * Set the i2c speed.
+ */
+void i2c_set_bus_speed(int speed)
+{
+	if (speed >= I2C_MAX_SPEED)
+		set_speed(IC_SPEED_MODE_MAX);
+	else
+	if (speed >= I2C_FAST_SPEED)
+		set_speed(IC_SPEED_MODE_FAST);
+	else
+		set_speed(IC_SPEED_MODE_STANDARD);
+}
+
+/**
+ * i2c_get_bus_speed - Gets the i2c speed
+ *
+ * Gets the i2c speed.
+ */
+int i2c_get_bus_speed(void)
+{
+	if (((readl(&i2c_regs_p->ic_con) & IC_CON_SPH) == IC_CON_SPH) &&
+	   ((readl(&i2c_regs_p->ic_con) & IC_CON_SPL) == IC_CON_SPL)) {
+		return I2C_MAX_SPEED;
+
+	} else if (((readl(&i2c_regs_p->ic_con) & IC_CON_SPH) == IC_CON_SPH) &&
+	   ((readl(&i2c_regs_p->ic_con) & IC_CON_SPL) == 0)) {
+		return I2C_FAST_SPEED;
+
+	} else if (((readl(&i2c_regs_p->ic_con) & IC_CON_SPF) == IC_CON_SPF) &&
+	   ((readl(&i2c_regs_p->ic_con) & IC_CON_SPL) == 0)) {
+		return I2C_STANDARD_SPEED;
+	}
+
+	return 0;
+}
+
+/**
+ * i2c_init - Init function
+ * @speed:	required i2c speed
+ * @slaveadd:	slave address for the spear device
+ *
+ * Initialization function.
+ */
+void i2c_init(int speed, int slaveadd)
+{
+	unsigned int enbl;
+
+	/* Disable i2c */
+	enbl = readl(&i2c_regs_p->ic_enable);
+	enbl &= ~IC_ENABLE_0B;
+	writel(enbl, &i2c_regs_p->ic_enable);
+
+	writel((IC_CON_SD | IC_CON_SPF | IC_CON_MM), &i2c_regs_p->ic_con);
+	writel(IC_TL0, &i2c_regs_p->ic_rx_tl);
+	writel(IC_TL0, &i2c_regs_p->ic_tx_tl);
+	i2c_set_bus_speed(speed);
+	writel(IC_STOP_DET, &i2c_regs_p->ic_intr_mask);
+	writel(slaveadd, &i2c_regs_p->ic_sar);
+
+	/* Enable i2c */
+	enbl = readl(&i2c_regs_p->ic_enable);
+	enbl |= IC_ENABLE_0B;
+	writel(enbl, &i2c_regs_p->ic_enable);
+}
+
+/**
+ * i2c_setaddress - Sets the target slave address
+ * @i2c_addr:	target i2c address
+ *
+ * Sets the target slave address.
+ */
+static void i2c_setaddress(unsigned int i2c_addr)
+{
+	writel(i2c_addr, &i2c_regs_p->ic_tar);
+}
+
+/**
+ * i2c_probe - Probe the i2c chip
+ *
+ * TBD
+ */
+int i2c_probe(uchar chip)
+{
+	return 0;
+}
+
+/**
+ * i2c_flush_rxfifo - Flushes the i2c RX FIFO
+ *
+ * Flushes the i2c RX FIFO
+ */
+void i2c_flush_rxfifo(void)
+{
+	while (readl(&i2c_regs_p->ic_status) & IC_STATUS_RFNE)
+		readl(&i2c_regs_p->ic_cmd_data);
+}
+
+/**
+ * i2c_wait_for_bb - Waits for bus busy
+ *
+ * Waits for bus busy
+ */
+static int i2c_wait_for_bb(void)
+{
+	unsigned long start_time_bb = get_timer_masked();
+
+	while ((readl(&i2c_regs_p->ic_status) & IC_STATUS_MA) ||
+		!(readl(&i2c_regs_p->ic_status) & IC_STATUS_TFE)) {
+
+		/* Evaluate timeout */
+		if (get_timer(start_time_bb) > (unsigned long)(I2C_BYTE_TO_BB))
+			return 1;
+	}
+
+	return 0;
+}
+
+/**
+ * i2c_read - Read from i2c memory
+ * @chip:	target i2c address
+ * @addr:	address to read from
+ * @alen:
+ * @buffer:	buffer for read data
+ * @len:	no of bytes to be read
+ *
+ * Read from i2c memory.
+ */
+int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len)
+{
+	unsigned long start_time_rx;
+
+	if (buffer == NULL) {
+		printf("I2C read: buffer is invalid\n");
+		return 1;
+	}
+
+	if (alen > 1) {
+		printf("I2C read: addr len %d not supported\n", alen);
+		return 1;
+	}
+
+	if (addr + len > 256) {
+		printf("I2C read: address out of range\n");
+		return 1;
+	}
+
+	if (i2c_wait_for_bb())
+		return 1;
+
+	i2c_setaddress(chip);
+	writel(addr, &i2c_regs_p->ic_cmd_data);
+
+	start_time_rx = get_timer_masked();
+	while (len) {
+		writel(IC_CMD, &i2c_regs_p->ic_cmd_data);
+		if ((readl(&i2c_regs_p->ic_status) & IC_STATUS_RFNE) ==
+				IC_STATUS_RFNE) {
+			*buffer++ = (uchar)readl(&i2c_regs_p->ic_cmd_data);
+			len--;
+			start_time_rx = get_timer_masked();
+		} else {
+			if (get_timer(start_time_rx) > I2C_BYTE_TO)
+				return 1;
+		}
+	}
+
+	udelay(4000);
+	if ((readl(&i2c_regs_p->ic_raw_intr_stat) & IC_STOP_DET))
+		readl(&i2c_regs_p->ic_clr_stop_det);
+
+	if (i2c_wait_for_bb())
+		return 1;
+
+	i2c_flush_rxfifo();
+
+	return 0;
+}
+
+/**
+ * i2c_write - Write to i2c memory
+ * @chip:	target i2c address
+ * @addr:	address to read from
+ * @alen:
+ * @buffer:	buffer for read data
+ * @len:	no of bytes to be read
+ *
+ * Write to i2c memory.
+ */
+int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len)
+{
+	int nb = len;
+	unsigned long start_time_tx;
+
+	if (buffer == NULL) {
+		printf("I2C write: buffer is invalid\n");
+		return 1;
+	}
+
+	if (alen > 1) {
+		printf("I2C write: addr len %d not supported\n", alen);
+		return 1;
+	}
+
+	if (addr + len > 256) {
+		printf("I2C write: address out of range\n");
+		return 1;
+	}
+
+	if (i2c_wait_for_bb())
+		return 1;
+
+	i2c_setaddress(chip);
+
+	writel(addr, &i2c_regs_p->ic_cmd_data);
+
+	start_time_tx = get_timer_masked();
+	while (len) {
+		if ((readl(&i2c_regs_p->ic_status) & IC_STATUS_TFNF)
+			== IC_STATUS_TFNF) {
+			writel(*buffer, &i2c_regs_p->ic_cmd_data);
+			buffer++;
+			len--;
+			start_time_tx = get_timer_masked();
+		} else {
+			if (get_timer(start_time_tx) > (nb * I2C_BYTE_TO))
+				return 1;
+		}
+	}
+
+	udelay(4000);
+	if ((readl(&i2c_regs_p->ic_raw_intr_stat) & IC_STOP_DET))
+		readl(&i2c_regs_p->ic_clr_stop_det);
+
+	if (i2c_wait_for_bb())
+		return 1;
+
+	i2c_flush_rxfifo();
+
+	return 0;
+}
+
diff --git a/include/asm-arm/arch-spear/spr_i2c.h b/include/asm-arm/arch-spear/spr_i2c.h
new file mode 100755
index 0000000..6fe80e9
--- /dev/null
+++ b/include/asm-arm/arch-spear/spr_i2c.h
@@ -0,0 +1,143 @@
+/*
+ * (C) Copyright 2009
+ * Vipin Kumar, ST Micoelectronics, vipin.kumar at st.com.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#ifndef __SPR_I2C_H_
+#define __SPR_I2C_H_
+
+struct i2c_regs {
+	u32 ic_con;
+	u32 ic_tar;
+	u32 ic_sar;
+	u32 ic_hs_maddr;
+	u32 ic_cmd_data;
+	u32 ic_ss_scl_hcnt;
+	u32 ic_ss_scl_lcnt;
+	u32 ic_fs_scl_hcnt;
+	u32 ic_fs_scl_lcnt;
+	u32 ic_hs_scl_hcnt;
+	u32 ic_hs_scl_lcnt;
+	u32 ic_intr_stat;
+	u32 ic_intr_mask;
+	u32 ic_raw_intr_stat;
+	u32 ic_rx_tl;
+	u32 ic_tx_tl;
+	u32 ic_clr_intr;
+	u32 ic_clr_rx_under;
+	u32 ic_clr_rx_over;
+	u32 ic_clr_tx_over;
+	u32 ic_clr_rd_req;
+	u32 ic_clr_tx_abrt;
+	u32 ic_clr_rx_done;
+	u32 ic_clr_activity;
+	u32 ic_clr_stop_det;
+	u32 ic_clr_start_det;
+	u32 ic_clr_gen_call;
+	u32 ic_enable;
+	u32 ic_status;
+	u32 ic_txflr;
+	u32 ix_rxflr;
+	u32 reserved_1;
+	u32 ic_tx_abrt_source;
+};
+
+#define IC_CLK			166
+#define NANO_TO_MICRO		1000
+
+/* High and low times in different speed modes (in ns) */
+#define MIN_SS_SCL_HIGHTIME	4000
+#define MIN_SS_SCL_LOWTIME	5000
+#define MIN_FS_SCL_HIGHTIME	800
+#define MIN_FS_SCL_LOWTIME	1700
+#define MIN_HS_SCL_HIGHTIME	60
+#define MIN_HS_SCL_LOWTIME	160
+
+/* Worst case timeout for 1 byte is kept as 1ms */
+#define I2C_BYTE_TO		(CONFIG_SYS_HZ/1000)
+#define I2C_BYTE_TO_BB		(I2C_BYTE_TO * 16)
+
+
+/* i2c control register definitions */
+#define IC_CON_SD		0x0040
+#define IC_CON_RE		0x0020
+#define IC_CON_10BITADDRMASTER	0x0010
+#define IC_CON_10BITADDR_SLAVE	0x0008
+#define IC_CON_SPH		0x0006
+#define IC_CON_SPF		0x0004
+#define IC_CON_SPL		0x0002
+#define IC_CON_MM		0x0001
+
+/* i2c target address register definitions */
+#define TAR_ADDR		0x0050
+
+/* i2c slave address register definitions */
+#define IC_SLAVE_ADDR		0x0002
+
+/* i2c data buffer and command register definitions */
+#define IC_CMD			0x0100
+
+/* i2c interrupt status register definitions */
+#define IC_GEN_CALL		0x0800
+#define IC_START_DET		0x0400
+#define IC_STOP_DET		0x0200
+#define IC_ACTIVITY		0x0100
+#define IC_RX_DONE		0x0080
+#define IC_TX_ABRT		0x0040
+#define IC_RD_REQ		0x0020
+#define IC_TX_EMPTY		0x0010
+#define IC_TX_OVER		0x0008
+#define IC_RX_FULL		0x0004
+#define IC_RX_OVER 		0x0002
+#define IC_RX_UNDER		0x0001
+
+/* fifo threshold register definitions */
+#define IC_TL0			0x00
+#define IC_TL1			0x01
+#define IC_TL2			0x02
+#define IC_TL3			0x03
+#define IC_TL4			0x04
+#define IC_TL5			0x05
+#define IC_TL6			0x06
+#define IC_TL7			0x07
+
+/* i2c enable register definitions */
+#define IC_ENABLE_0B		0x0001
+
+/* i2c status register  definitions */
+#define IC_STATUS_SA		0x0040
+#define IC_STATUS_MA		0x0020
+#define IC_STATUS_RFF		0x0010
+#define IC_STATUS_RFNE		0x0008
+#define IC_STATUS_TFE		0x0004
+#define IC_STATUS_TFNF		0x0002
+#define IC_STATUS_ACT		0x0001
+
+/* Speed Selection */
+#define IC_SPEED_MODE_STANDARD	1
+#define IC_SPEED_MODE_FAST	2
+#define IC_SPEED_MODE_MAX	3
+
+#define I2C_MAX_SPEED		3400000
+#define I2C_FAST_SPEED		400000
+#define I2C_STANDARD_SPEED	100000
+
+#endif /* __SPR_I2C_H_ */
-- 
1.6.0.2