[PATCH v2 1/2] i2c: wmt: split out i2c-viai2c-common.{c,h}

Hans Hu
2023-08-14T08:41:19Z

1. export common marcos and use prefix VIAI2C rename them.
2. export common functions and use prefix via_i2c rename them.
3. rename data structure wmt_i2c_dev to via_i2c and export it.
4. adjust some redundant code.

Signed-off-by: Hans Hu <hanshu-oc@zhaoxin.com>
---
drivers/i2c/busses/Kconfig | 4 +
drivers/i2c/busses/Makefile | 1 +
drivers/i2c/busses/i2c-viai2c-common.c | 233 ++++++++++++++
drivers/i2c/busses/i2c-viai2c-common.h | 65 ++++
drivers/i2c/busses/i2c-wmt.c | 402 ++-----------------------
5 files changed, 333 insertions(+), 372 deletions(-)
create mode 100644 drivers/i2c/busses/i2c-viai2c-common.c
create mode 100644 drivers/i2c/busses/i2c-viai2c-common.h

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 9cfe8fc509d7..b810030b21cd 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -1178,9 +1178,13 @@ config I2C_VERSATILE
This driver can also be built as a module. If so, the module
will be called i2c-versatile.

+config I2C_VIAI2C_COMMON
+ tristate
+
config I2C_WMT
tristate "Wondermedia WM8xxx SoC I2C bus support"
depends on ARCH_VT8500 || COMPILE_TEST
+ select I2C_VIAI2C_COMMON
help
Say yes if you want to support the I2C bus on Wondermedia 8xxx-series
SoCs.
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index af56fe2c75c0..b7e20c3531b5 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -120,6 +120,7 @@ obj-$(CONFIG_I2C_TEGRA_BPMP) += i2c-tegra-bpmp.o
obj-$(CONFIG_I2C_UNIPHIER) += i2c-uniphier.o
obj-$(CONFIG_I2C_UNIPHIER_F) += i2c-uniphier-f.o
obj-$(CONFIG_I2C_VERSATILE) += i2c-versatile.o
+obj-$(CONFIG_I2C_VIAI2C_COMMON) += i2c-viai2c-common.o
obj-$(CONFIG_I2C_WMT) += i2c-wmt.o
i2c-octeon-objs := i2c-octeon-core.o i2c-octeon-platdrv.o
obj-$(CONFIG_I2C_OCTEON) += i2c-octeon.o
diff --git a/drivers/i2c/busses/i2c-viai2c-common.c b/drivers/i2c/busses/i2c-viai2c-common.c
new file mode 100644
index 000000000000..ffba29ce17c5
--- /dev/null
+++ b/drivers/i2c/busses/i2c-viai2c-common.c
@@ -0,0 +1,233 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Common driver for VIA i2c drivers
+ */
+#include <linux/of_irq.h>
+#include "i2c-viai2c-common.h"
+
+int via_i2c_wait_bus_ready(struct via_i2c *i2c)
+{
+ unsigned long timeout;
+
+ timeout = jiffies + VIAI2C_TIMEOUT;
+ while (!(readw(i2c->base + VIAI2C_CSR) & VIAI2C_CSR_READY_MASK)) {
+ if (time_after(jiffies, timeout)) {
+ dev_warn(i2c->dev, "timeout waiting for bus ready\n");
+ return -EBUSY;
+ }
+ msleep(20);
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(via_i2c_wait_bus_ready);
+
+int via_i2c_wait_event(struct via_i2c *i2c, u16 event)
+{
+ if (!wait_for_completion_timeout(&i2c->complete, VIAI2C_TIMEOUT)) {
+ dev_err(i2c->dev, "wait timeout(SW)\n");
+ return -ETIMEDOUT;
+ }
+
+ if (i2c->event & event)
+ return 0;
+
+ return -EIO;
+}
+EXPORT_SYMBOL(via_i2c_wait_event);
+
+static int via_i2c_write(struct via_i2c *i2c, struct i2c_msg *pmsg, int last)
+{
+ int xfer_len = 0;
+ u16 val, tcr_val = i2c->tcr;
+ void __iomem *base = i2c->base;
+
+ if (pmsg->len == 0) {
+ /*
+ * We still need to run through the while (..) once, so
+ * start at -1 and break out early from the loop
+ */
+ xfer_len = -1;
+ writew(0, base + VIAI2C_CDR);
+ } else {
+ writew(pmsg->buf[0], base + VIAI2C_CDR);
+ }
+
+ if (!(pmsg->flags & I2C_M_NOSTART)) {
+ val = readb(base + VIAI2C_CR);
+ val &= ~VIAI2C_CR_TX_END;
+ val |= VIAI2C_CR_CPU_RDY;
+ writeb(val, base + VIAI2C_CR);
+ }
+
+ reinit_completion(&i2c->complete);
+
+ tcr_val |= (pmsg->addr & VIAI2C_TCR_ADDR_MASK);
+
+ writew(tcr_val, base + VIAI2C_TCR);
+
+ if (pmsg->flags & I2C_M_NOSTART) {
+ val = readb(base + VIAI2C_CR);
+ val |= VIAI2C_CR_CPU_RDY;
+ writeb(val, base + VIAI2C_CR);
+ }
+
+ while (xfer_len < pmsg->len) {
+ int err;
+
+ err = via_i2c_wait_event(i2c, VIAI2C_ISR_BYTE_END);
+ if (err)
+ return err;
+
+ xfer_len++;
+
+ val = readw(base + VIAI2C_CSR);
+ if (val & VIAI2C_CSR_RCV_NACK) {
+ dev_dbg(i2c->dev, "write RCV NACK error\n");
+ return -EIO;
+ }
+
+ if (pmsg->len == 0) {
+ val = VIAI2C_CR_TX_END | VIAI2C_CR_CONTINUE_MASK;
+ writeb(val, base + VIAI2C_CR);
+ break;
+ }
+
+ if (xfer_len == pmsg->len) {
+ if (last != 1)
+ writeb(VIAI2C_CR_ENABLE, base + VIAI2C_CR);
+ } else {
+ writeb(pmsg->buf[xfer_len] & 0xFF, base + VIAI2C_CDR);
+ writeb(VIAI2C_CR_CONTINUE_MASK, base + VIAI2C_CR);
+ }
+ }
+
+ return 0;
+}
+
+static int via_i2c_read(struct via_i2c *i2c, struct i2c_msg *pmsg)
+{
+ u32 xfer_len = 0;
+ u16 val, tcr_val = i2c->tcr;
+ void __iomem *base = i2c->base;
+
+ val = readb(base + VIAI2C_CR);
+ val &= ~VIAI2C_CR_END_MASK;
+ if (!(pmsg->flags & I2C_M_NOSTART))
+ val |= VIAI2C_CR_CPU_RDY;
+ if (pmsg->len == 1)
+ val |= VIAI2C_CR_TX_NEXT_NO_ACK;
+ writeb(val, base + VIAI2C_CR);
+
+ reinit_completion(&i2c->complete);
+
+ tcr_val |= VIAI2C_TCR_READ | (pmsg->addr & VIAI2C_TCR_ADDR_MASK);
+
+ writew(tcr_val, base + VIAI2C_TCR);
+
+ if (pmsg->flags & I2C_M_NOSTART) {
+ val = readb(base + VIAI2C_CR);
+ val |= VIAI2C_CR_CPU_RDY;
+ writeb(val, base + VIAI2C_CR);
+ }
+
+ while (xfer_len < pmsg->len) {
+ int err;
+
+ err = via_i2c_wait_event(i2c, VIAI2C_ISR_BYTE_END);
+ if (err)
+ return err;
+
+ pmsg->buf[xfer_len] = readw(base + VIAI2C_CDR) >> 8;
+ xfer_len++;
+
+ val = readb(base + VIAI2C_CR) | VIAI2C_CR_CPU_RDY;
+ if (xfer_len == pmsg->len - 1)
+ val |= VIAI2C_CR_TX_NEXT_NO_ACK;
+ writeb(val, base + VIAI2C_CR);
+ }
+
+ return 0;
+}
+
+int via_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
+{
+ int i;
+ int ret = 0;
+ struct via_i2c *i2c = i2c_get_adapdata(adap);
+
+ for (i = 0; ret >= 0 && i < num; i++) {
+ struct i2c_msg * pmsg = &msgs[i];
+
+ if (!(pmsg->flags & I2C_M_NOSTART)) {
+ ret = via_i2c_wait_bus_ready(i2c);
+ if (ret < 0)
+ return ret;
+ }
+
+ if (pmsg->flags & I2C_M_RD)
+ ret = via_i2c_read(i2c, pmsg);
+ else
+ ret = via_i2c_write(i2c, pmsg, (i + 1) == num);
+ }
+
+ return (ret < 0) ? ret : i;
+}
+EXPORT_SYMBOL(via_i2c_xfer);
+
+static irqreturn_t via_i2c_isr(int irq, void *data)
+{
+ struct via_i2c *i2c = data;
+
+ /* save the status and write-clear it */
+ i2c->event = readw(i2c->base + VIAI2C_ISR);
+ writew(i2c->event, i2c->base + VIAI2C_ISR);
+
+ complete(&i2c->complete);
+
+ return IRQ_HANDLED;
+}
+
+int via_i2c_init(struct platform_device *pdev, struct via_i2c **pi2c)
+{
+ int err;
+ int irq_flags;
+ struct via_i2c *i2c;
+ struct device_node *np = pdev->dev.of_node;
+
+ i2c = devm_kzalloc(&pdev->dev, sizeof(*i2c), GFP_KERNEL);
+ if (!i2c)
+ return -ENOMEM;
+
+ i2c->base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(i2c->base))
+ return PTR_ERR(i2c->base);
+
+ if (np) {
+ irq_flags = 0;
+ i2c->irq = irq_of_parse_and_map(np, 0);
+ } else {
+ irq_flags = IRQF_SHARED;
+ i2c->irq = platform_get_irq(pdev, 0);
+ }
+ if (i2c->irq < 0)
+ return i2c->irq;
+
+ err = devm_request_irq(&pdev->dev, i2c->irq, via_i2c_isr,
+ irq_flags, pdev->name, i2c);
+ if (err)
+ return dev_err_probe(&pdev->dev, err,
+ "failure requesting irq %d\n", i2c->irq);
+
+ i2c->dev = &pdev->dev;
+ platform_set_drvdata(pdev, i2c);
+ init_completion(&i2c->complete);
+
+ *pi2c = i2c;
+
+ return 0;
+}
+EXPORT_SYMBOL(via_i2c_init);
+
+MODULE_DESCRIPTION("Common driver for VIA i2c drivers");
+MODULE_LICENSE("GPL");
diff --git a/drivers/i2c/busses/i2c-viai2c-common.h b/drivers/i2c/busses/i2c-viai2c-common.h
new file mode 100644
index 000000000000..f3a86f005eb9
--- /dev/null
+++ b/drivers/i2c/busses/i2c-viai2c-common.h
@@ -0,0 +1,65 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#ifndef I2C_VIAI2C_COMMON_H
+#define I2C_VIAI2C_COMMON_H
+
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#define VIAI2C_CR 0x00
+#define VIAI2C_CR_ENABLE BIT(0)
+#define VIAI2C_CR_TX_NEXT_NO_ACK BIT(1)
+#define VIAI2C_CR_TX_END BIT(2)
+#define VIAI2C_CR_CPU_RDY BIT(3)
+#define VIAI2C_CR_END_MASK GENMASK(2, 1)
+#define VIAI2C_CR_CONTINUE_MASK (BIT(3) | BIT(0))
+
+#define VIAI2C_TCR 0x02
+#define VIAI2C_TCR_HS_MODE BIT(13)
+#define VIAI2C_TCR_READ BIT(14)
+#define VIAI2C_TCR_FAST BIT(15)
+#define VIAI2C_TCR_ADDR_MASK GENMASK(6, 0)
+
+#define VIAI2C_CSR 0x04
+#define VIAI2C_CSR_RCV_NACK BIT(0)
+#define VIAI2C_CSR_READY_MASK BIT(1)
+
+#define VIAI2C_ISR 0x06
+#define VIAI2C_ISR_NACK_ADDR BIT(0)
+#define VIAI2C_ISR_BYTE_END BIT(1)
+#define VIAI2C_ISR_SCL_TIMEOUT BIT(2)
+#define VIAI2C_ISR_WRITE_ALL GENMASK(2, 0)
+
+#define VIAI2C_IMR 0x08
+#define VIAI2C_IMR_ADDRNACK BIT(0)
+#define VIAI2C_IMR_BYTE BIT(1)
+#define VIAI2C_IMR_SCL_TIMEOUT BIT(2)
+#define VIAI2C_IMR_EN_ALL GENMASK(2, 0)
+
+#define VIAI2C_CDR 0x0A
+#define VIAI2C_TR 0x0C
+#define VIAI2C_MCR 0x0E
+
+#define VIAI2C_TIMEOUT (msecs_to_jiffies(1000))
+
+struct via_i2c {
+ struct i2c_adapter adapter;
+ struct completion complete;
+ struct device *dev;
+ void __iomem *base;
+ struct clk *clk;
+ int irq;
+ u16 event;
+ u16 tcr;
+};
+
+int via_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num);
+int via_i2c_wait_bus_ready(struct via_i2c *i2c);
+int via_i2c_wait_event(struct via_i2c *i2c, u16 event);
+int via_i2c_init(struct platform_device *pdev, struct via_i2c **pi2c);
+
+#endif
diff --git a/drivers/i2c/busses/i2c-wmt.c b/drivers/i2c/busses/i2c-wmt.c
index 76118abc6e10..d282f2146fb3 100644
--- a/drivers/i2c/busses/i2c-wmt.c
+++ b/drivers/i2c/busses/i2c-wmt.c
@@ -7,309 +7,21 @@
* Derived from GPLv2+ licensed source:
* - Copyright (C) 2008 WonderMedia Technologies, Inc.
*/
-
#include <linux/clk.h>
-#include <linux/delay.h>
-#include <linux/err.h>
-#include <linux/i2c.h>
-#include <linux/interrupt.h>
-#include <linux/io.h>
-#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
-#include <linux/of_irq.h>
-#include <linux/platform_device.h>
-
-#define REG_CR 0x00
-#define REG_TCR 0x02
-#define REG_CSR 0x04
-#define REG_ISR 0x06
-#define REG_IMR 0x08
-#define REG_CDR 0x0A
-#define REG_TR 0x0C
-#define REG_MCR 0x0E
-#define REG_SLAVE_CR 0x10
-#define REG_SLAVE_SR 0x12
-#define REG_SLAVE_ISR 0x14
-#define REG_SLAVE_IMR 0x16
-#define REG_SLAVE_DR 0x18
-#define REG_SLAVE_TR 0x1A
-
-/* REG_CR Bit fields */
-#define CR_TX_NEXT_ACK 0x0000
-#define CR_ENABLE 0x0001
-#define CR_TX_NEXT_NO_ACK 0x0002
-#define CR_TX_END 0x0004
-#define CR_CPU_RDY 0x0008
-#define SLAV_MODE_SEL 0x8000
-
-/* REG_TCR Bit fields */
-#define TCR_STANDARD_MODE 0x0000
-#define TCR_MASTER_WRITE 0x0000
-#define TCR_HS_MODE 0x2000
-#define TCR_MASTER_READ 0x4000
-#define TCR_FAST_MODE 0x8000
-#define TCR_SLAVE_ADDR_MASK 0x007F
-
-/* REG_ISR Bit fields */
-#define ISR_NACK_ADDR 0x0001
-#define ISR_BYTE_END 0x0002
-#define ISR_SCL_TIMEOUT 0x0004
-#define ISR_WRITE_ALL 0x0007
-
-/* REG_IMR Bit fields */
-#define IMR_ENABLE_ALL 0x0007
-
-/* REG_CSR Bit fields */
-#define CSR_RCV_NOT_ACK 0x0001
-#define CSR_RCV_ACK_MASK 0x0001
-#define CSR_READY_MASK 0x0002
-
-/* REG_TR */
-#define SCL_TIMEOUT(x) (((x) & 0xFF) << 8)
-#define TR_STD 0x0064
-#define TR_HS 0x0019
-
-/* REG_MCR */
-#define MCR_APB_96M 7
-#define MCR_APB_166M 12
-
-#define I2C_MODE_STANDARD 0
-#define I2C_MODE_FAST 1
-
-#define WMT_I2C_TIMEOUT (msecs_to_jiffies(1000))
-
-struct wmt_i2c_dev {
- struct i2c_adapter adapter;
- struct completion complete;
- struct device *dev;
- void __iomem *base;
- struct clk *clk;
- int mode;
- int irq;
- u16 cmd_status;
-};
-
-static int wmt_i2c_wait_bus_not_busy(struct wmt_i2c_dev *i2c_dev)
-{
- unsigned long timeout;
-
- timeout = jiffies + WMT_I2C_TIMEOUT;
- while (!(readw(i2c_dev->base + REG_CSR) & CSR_READY_MASK)) {
- if (time_after(jiffies, timeout)) {
- dev_warn(i2c_dev->dev, "timeout waiting for bus ready\n");
- return -EBUSY;
- }
- msleep(20);
- }
-
- return 0;
-}
-
-static int wmt_check_status(struct wmt_i2c_dev *i2c_dev)
-{
- int ret = 0;
-
- if (i2c_dev->cmd_status & ISR_NACK_ADDR)
- ret = -EIO;
-
- if (i2c_dev->cmd_status & ISR_SCL_TIMEOUT)
- ret = -ETIMEDOUT;
-
- return ret;
-}
-
-static int wmt_i2c_write(struct i2c_adapter *adap, struct i2c_msg *pmsg,
- int last)
-{
- struct wmt_i2c_dev *i2c_dev = i2c_get_adapdata(adap);
- u16 val, tcr_val;
- int ret;
- unsigned long wait_result;
- int xfer_len = 0;
-
- if (!(pmsg->flags & I2C_M_NOSTART)) {
- ret = wmt_i2c_wait_bus_not_busy(i2c_dev);
- if (ret < 0)
- return ret;
- }
-
- if (pmsg->len == 0) {
- /*
- * We still need to run through the while (..) once, so
- * start at -1 and break out early from the loop
- */
- xfer_len = -1;
- writew(0, i2c_dev->base + REG_CDR);
- } else {
- writew(pmsg->buf[0] & 0xFF, i2c_dev->base + REG_CDR);
- }
-
- if (!(pmsg->flags & I2C_M_NOSTART)) {
- val = readw(i2c_dev->base + REG_CR);
- val &= ~CR_TX_END;
- writew(val, i2c_dev->base + REG_CR);
-
- val = readw(i2c_dev->base + REG_CR);
- val |= CR_CPU_RDY;
- writew(val, i2c_dev->base + REG_CR);
- }
-
- reinit_completion(&i2c_dev->complete);
-
- if (i2c_dev->mode == I2C_MODE_STANDARD)
- tcr_val = TCR_STANDARD_MODE;
- else
- tcr_val = TCR_FAST_MODE;
-
- tcr_val |= (TCR_MASTER_WRITE | (pmsg->addr & TCR_SLAVE_ADDR_MASK));
-
- writew(tcr_val, i2c_dev->base + REG_TCR);
-
- if (pmsg->flags & I2C_M_NOSTART) {
- val = readw(i2c_dev->base + REG_CR);
- val |= CR_CPU_RDY;
- writew(val, i2c_dev->base + REG_CR);
- }
-
- while (xfer_len < pmsg->len) {
- wait_result = wait_for_completion_timeout(&i2c_dev->complete,
- msecs_to_jiffies(500));
-
- if (wait_result == 0)
- return -ETIMEDOUT;
-
- ret = wmt_check_status(i2c_dev);
- if (ret)
- return ret;
-
- xfer_len++;
-
- val = readw(i2c_dev->base + REG_CSR);
- if ((val & CSR_RCV_ACK_MASK) == CSR_RCV_NOT_ACK) {
- dev_dbg(i2c_dev->dev, "write RCV NACK error\n");
- return -EIO;
- }
-
- if (pmsg->len == 0) {
- val = CR_TX_END | CR_CPU_RDY | CR_ENABLE;
- writew(val, i2c_dev->base + REG_CR);
- break;
- }
-
- if (xfer_len == pmsg->len) {
- if (last != 1)
- writew(CR_ENABLE, i2c_dev->base + REG_CR);
- } else {
- writew(pmsg->buf[xfer_len] & 0xFF, i2c_dev->base +
- REG_CDR);
- writew(CR_CPU_RDY | CR_ENABLE, i2c_dev->base + REG_CR);
- }
- }
-
- return 0;
-}
-
-static int wmt_i2c_read(struct i2c_adapter *adap, struct i2c_msg *pmsg,
- int last)
-{
- struct wmt_i2c_dev *i2c_dev = i2c_get_adapdata(adap);
- u16 val, tcr_val;
- int ret;
- unsigned long wait_result;
- u32 xfer_len = 0;
-
- if (!(pmsg->flags & I2C_M_NOSTART)) {
- ret = wmt_i2c_wait_bus_not_busy(i2c_dev);
- if (ret < 0)
- return ret;
- }
-
- val = readw(i2c_dev->base + REG_CR);
- val &= ~CR_TX_END;
- writew(val, i2c_dev->base + REG_CR);
-
- val = readw(i2c_dev->base + REG_CR);
- val &= ~CR_TX_NEXT_NO_ACK;
- writew(val, i2c_dev->base + REG_CR);
-
- if (!(pmsg->flags & I2C_M_NOSTART)) {
- val = readw(i2c_dev->base + REG_CR);
- val |= CR_CPU_RDY;
- writew(val, i2c_dev->base + REG_CR);
- }
-
- if (pmsg->len == 1) {
- val = readw(i2c_dev->base + REG_CR);
- val |= CR_TX_NEXT_NO_ACK;
- writew(val, i2c_dev->base + REG_CR);
- }
-
- reinit_completion(&i2c_dev->complete);
-
- if (i2c_dev->mode == I2C_MODE_STANDARD)
- tcr_val = TCR_STANDARD_MODE;
- else
- tcr_val = TCR_FAST_MODE;
-
- tcr_val |= TCR_MASTER_READ | (pmsg->addr & TCR_SLAVE_ADDR_MASK);
-
- writew(tcr_val, i2c_dev->base + REG_TCR);
-
- if (pmsg->flags & I2C_M_NOSTART) {
- val = readw(i2c_dev->base + REG_CR);
- val |= CR_CPU_RDY;
- writew(val, i2c_dev->base + REG_CR);
- }
+#include "i2c-viai2c-common.h"

- while (xfer_len < pmsg->len) {
- wait_result = wait_for_completion_timeout(&i2c_dev->complete,
- msecs_to_jiffies(500));
+#define wmt_i2c_dev via_i2c

- if (!wait_result)
- return -ETIMEDOUT;
+/* VIAI2C_TR */
+#define WMT_SCL_TOUT (((128) & 0xFF) << 8)
+#define WMT_TR_STD 0x0064
+#define WMT_TR_HS 0x0019

- ret = wmt_check_status(i2c_dev);
- if (ret)
- return ret;
-
- pmsg->buf[xfer_len] = readw(i2c_dev->base + REG_CDR) >> 8;
- xfer_len++;
-
- if (xfer_len == pmsg->len - 1) {
- val = readw(i2c_dev->base + REG_CR);
- val |= (CR_TX_NEXT_NO_ACK | CR_CPU_RDY);
- writew(val, i2c_dev->base + REG_CR);
- } else {
- val = readw(i2c_dev->base + REG_CR);
- val |= CR_CPU_RDY;
- writew(val, i2c_dev->base + REG_CR);
- }
- }
-
- return 0;
-}
-
-static int wmt_i2c_xfer(struct i2c_adapter *adap,
- struct i2c_msg msgs[],
- int num)
-{
- struct i2c_msg *pmsg;
- int i, is_last;
- int ret = 0;
-
- for (i = 0; ret >= 0 && i < num; i++) {
- is_last = ((i + 1) == num);
-
- pmsg = &msgs[i];
- if (pmsg->flags & I2C_M_RD)
- ret = wmt_i2c_read(adap, pmsg, is_last);
- else
- ret = wmt_i2c_write(adap, pmsg, is_last);
- }
-
- return (ret < 0) ? ret : i;
-}
+/* VIAI2C_MCR */
+#define WMT_MCR_APB_96M 7
+#define WMT_MCR_APB_166M 12

static u32 wmt_i2c_func(struct i2c_adapter *adap)
{
@@ -317,23 +29,10 @@ static u32 wmt_i2c_func(struct i2c_adapter *adap)
}

static const struct i2c_algorithm wmt_i2c_algo = {
- .master_xfer = wmt_i2c_xfer,
+ .master_xfer = via_i2c_xfer,
.functionality = wmt_i2c_func,
};

-static irqreturn_t wmt_i2c_isr(int irq, void *data)
-{
- struct wmt_i2c_dev *i2c_dev = data;
-
- /* save the status and write-clear it */
- i2c_dev->cmd_status = readw(i2c_dev->base + REG_ISR);
- writew(i2c_dev->cmd_status, i2c_dev->base + REG_ISR);
-
- complete(&i2c_dev->complete);
-
- return IRQ_HANDLED;
-}
-
static int wmt_i2c_reset_hardware(struct wmt_i2c_dev *i2c_dev)
{
int err;
@@ -351,18 +50,18 @@ static int wmt_i2c_reset_hardware(struct wmt_i2c_dev *i2c_dev)
return err;
}

- writew(0, i2c_dev->base + REG_CR);
- writew(MCR_APB_166M, i2c_dev->base + REG_MCR);
- writew(ISR_WRITE_ALL, i2c_dev->base + REG_ISR);
- writew(IMR_ENABLE_ALL, i2c_dev->base + REG_IMR);
- writew(CR_ENABLE, i2c_dev->base + REG_CR);
- readw(i2c_dev->base + REG_CSR); /* read clear */
- writew(ISR_WRITE_ALL, i2c_dev->base + REG_ISR);
+ writew(0, i2c_dev->base + VIAI2C_CR);
+ writew(WMT_MCR_APB_166M, i2c_dev->base + VIAI2C_MCR);
+ writew(VIAI2C_ISR_WRITE_ALL, i2c_dev->base + VIAI2C_ISR);
+ writew(VIAI2C_IMR_EN_ALL, i2c_dev->base + VIAI2C_IMR);
+ writew(VIAI2C_CR_ENABLE, i2c_dev->base + VIAI2C_CR);
+ readw(i2c_dev->base + VIAI2C_CSR); /* read clear */
+ writew(VIAI2C_ISR_WRITE_ALL, i2c_dev->base + VIAI2C_ISR);

- if (i2c_dev->mode == I2C_MODE_STANDARD)
- writew(SCL_TIMEOUT(128) | TR_STD, i2c_dev->base + REG_TR);
+ if (i2c_dev->tcr == VIAI2C_TCR_FAST)
+ writew(WMT_SCL_TOUT | WMT_TR_HS, i2c_dev->base + VIAI2C_TR);
else
- writew(SCL_TIMEOUT(128) | TR_HS, i2c_dev->base + REG_TR);
+ writew(WMT_SCL_TOUT | WMT_TR_STD, i2c_dev->base + VIAI2C_TR);

return 0;
}
@@ -375,39 +74,18 @@ static int wmt_i2c_probe(struct platform_device *pdev)
int err;
u32 clk_rate;

- i2c_dev = devm_kzalloc(&pdev->dev, sizeof(*i2c_dev), GFP_KERNEL);
- if (!i2c_dev)
- return -ENOMEM;
-
- i2c_dev->base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
- 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;
- }
+ err = via_i2c_init(pdev, &i2c_dev);
+ if (err)
+ return err;

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);
- }
+ if (IS_ERR(i2c_dev->clk))
+ return dev_err_probe(&pdev->dev, PTR_ERR(i2c_dev->clk),
+ "unable to request clock\n");

- i2c_dev->mode = I2C_MODE_STANDARD;
err = of_property_read_u32(np, "clock-frequency", &clk_rate);
if (!err && (clk_rate == I2C_MAX_FAST_MODE_FREQ))
- i2c_dev->mode = I2C_MODE_FAST;
-
- i2c_dev->dev = &pdev->dev;
-
- err = devm_request_irq(&pdev->dev, i2c_dev->irq, wmt_i2c_isr, 0,
- "i2c", i2c_dev);
- if (err) {
- dev_err(&pdev->dev, "failed to request irq %i\n", i2c_dev->irq);
- return err;
- }
+ i2c_dev->tcr = VIAI2C_TCR_FAST;

adap = &i2c_dev->adapter;
i2c_set_adapdata(adap, i2c_dev);
@@ -417,31 +95,12 @@ static int wmt_i2c_probe(struct platform_device *pdev)
adap->dev.parent = &pdev->dev;
adap->dev.of_node = pdev->dev.of_node;

- init_completion(&i2c_dev->complete);
-
err = wmt_i2c_reset_hardware(i2c_dev);
- if (err) {
- dev_err(&pdev->dev, "error initializing hardware\n");
- return err;
- }
-
- err = i2c_add_adapter(adap);
if (err)
- return err;
-
- platform_set_drvdata(pdev, i2c_dev);
-
- return 0;
-}
-
-static void wmt_i2c_remove(struct platform_device *pdev)
-{
- struct wmt_i2c_dev *i2c_dev = platform_get_drvdata(pdev);
+ return dev_err_probe(&pdev->dev, err,
+ "error initializing hardware\n");

- /* Disable interrupts, clock and delete adapter */
- writew(0, i2c_dev->base + REG_IMR);
- clk_disable_unprepare(i2c_dev->clk);
- i2c_del_adapter(&i2c_dev->adapter);
+ return devm_i2c_add_adapter(&pdev->dev, &i2c_dev->adapter);
}

static const struct of_device_id wmt_i2c_dt_ids[] = {
@@ -451,7 +110,6 @@ static const struct of_device_id wmt_i2c_dt_ids[] = {

static struct platform_driver wmt_i2c_driver = {
.probe = wmt_i2c_probe,
- .remove_new = wmt_i2c_remove,
.driver = {
.name = "wmt-i2c",
.of_match_table = wmt_i2c_dt_ids,
--
2.34.1