Since the I2C IP of both wmt and zhaoxin originates from VIA,
it is better to separate the common code first.
The common driver is named as i2c-viai2c-common.c.
Old i2c-wmt.c renamed to i2c-viai2c-wmt.c.
The MAINTAINERS file will be updated accordingly in upcoming commits.
Reviewed-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andi Shyti <andi.shyti@xxxxxxxxxx>
Signed-off-by: Hans Hu <hanshu-oc@xxxxxxxxxxx>
---
MAINTAINERS | 2 +-
drivers/i2c/busses/Makefile | 1 +
drivers/i2c/busses/i2c-viai2c-common.c | 221 +++++++++++++
drivers/i2c/busses/i2c-viai2c-common.h | 71 ++++
drivers/i2c/busses/i2c-viai2c-wmt.c | 148 +++++++++
drivers/i2c/busses/i2c-wmt.c | 430 -------------------------
6 files changed, 442 insertions(+), 431 deletions(-)
create mode 100644 drivers/i2c/busses/i2c-viai2c-common.c
create mode 100644 drivers/i2c/busses/i2c-viai2c-common.h
create mode 100644 drivers/i2c/busses/i2c-viai2c-wmt.c
delete mode 100644 drivers/i2c/busses/i2c-wmt.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 7c121493f43d..97fcb8d38210 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -3018,7 +3018,7 @@ S: Orphan
F: Documentation/devicetree/bindings/i2c/i2c-wmt.txt
F: arch/arm/mach-vt8500/
F: drivers/clocksource/timer-vt8500.c
-F: drivers/i2c/busses/i2c-wmt.c
+F: drivers/i2c/busses/i2c-viai2c-wmt.c
F: drivers/mmc/host/wmt-sdmmc.c
F: drivers/pwm/pwm-vt8500.c
F: drivers/rtc/rtc-vt8500.c
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index aa0ee8ecd6f2..63c7bbad8134 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -118,6 +118,7 @@ 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
+i2c-wmt-objs := i2c-viai2c-wmt.o 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..b36a5d902990
--- /dev/null
+++ b/drivers/i2c/busses/i2c-viai2c-common.c
@@ -0,0 +1,221 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#include <linux/of_irq.h>
+#include "i2c-viai2c-common.h"
+
+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;
+}
+
+int wmt_check_status(struct wmt_i2c_dev *i2c_dev)
+{
+ int ret = 0;
+ unsigned long wait_result;
+
+ wait_result = wait_for_completion_timeout(&i2c_dev->complete,
+ msecs_to_jiffies(500));
+ if (!wait_result)
+ return -ETIMEDOUT;
+
+ 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 wmt_i2c_dev *i2c_dev, struct i2c_msg *pmsg, int last)
+{
+ u16 val, tcr_val = i2c_dev->tcr;
+ int ret;
+ int xfer_len = 0;
+
+ 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;
+ val |= CR_CPU_RDY;
+ writew(val, i2c_dev->base + REG_CR);
+ }
+
+ reinit_completion(&i2c_dev->complete);
+
+ 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) {
+ 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 wmt_i2c_dev *i2c_dev, struct i2c_msg *pmsg)
+{
+ u16 val, tcr_val = i2c_dev->tcr;
+ int ret;
+ u32 xfer_len = 0;
+
+ val = readw(i2c_dev->base + REG_CR);
+ val &= ~(CR_TX_END | CR_TX_NEXT_NO_ACK);
+
+ if (!(pmsg->flags & I2C_M_NOSTART))
+ val |= CR_CPU_RDY;
+
+ if (pmsg->len == 1)
+ val |= CR_TX_NEXT_NO_ACK;
+
+ writew(val, i2c_dev->base + REG_CR);
+
+ reinit_completion(&i2c_dev->complete);
+
+ 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);
+ }
+
+ while (xfer_len < pmsg->len) {
+ ret = wmt_check_status(i2c_dev);
+ if (ret)
+ return ret;
+
+ pmsg->buf[xfer_len] = readw(i2c_dev->base + REG_CDR) >> 8;
+ xfer_len++;
+
+ val = readw(i2c_dev->base + REG_CR) | CR_CPU_RDY;
+ if (xfer_len == pmsg->len - 1)
+ val |= CR_TX_NEXT_NO_ACK;
+ writew(val, i2c_dev->base + REG_CR);
+ }
+
+ return 0;
+}
+
+int wmt_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
+{
+ struct i2c_msg *pmsg;
+ int i;
+ int ret = 0;
+ struct wmt_i2c_dev *i2c_dev = i2c_get_adapdata(adap);
+
+ for (i = 0; ret >= 0 && i < num; i++) {
+ pmsg = &msgs[i];
+ if (!(pmsg->flags & I2C_M_NOSTART)) {
+ ret = wmt_i2c_wait_bus_not_busy(i2c_dev);
+ if (ret < 0)
+ return ret;
+ }
+
+ if (pmsg->flags & I2C_M_RD)
+ ret = wmt_i2c_read(i2c_dev, pmsg);
+ else
+ ret = wmt_i2c_write(i2c_dev, pmsg, (i + 1) == num);
+ }
+
+ return (ret < 0) ? ret : i;
+}
+
+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;
+}
+
+int wmt_i2c_init(struct platform_device *pdev, struct wmt_i2c_dev **pi2c_dev)
+{
+ int err;
+ struct wmt_i2c_dev *i2c_dev;
+ struct device_node *np = pdev->dev.of_node;
+
+ 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)
+ return -EINVAL;
+
+ err = devm_request_irq(&pdev->dev, i2c_dev->irq, wmt_i2c_isr,
+ 0, pdev->name, i2c_dev);
+ if (err)
+ return dev_err_probe(&pdev->dev, err,
+ "failed to request irq %i\n", i2c_dev->irq);
+
+ i2c_dev->dev = &pdev->dev;
+ init_completion(&i2c_dev->complete);
+ platform_set_drvdata(pdev, i2c_dev);
+
+ *pi2c_dev = i2c_dev;
+ return 0;
+}
diff --git a/drivers/i2c/busses/i2c-viai2c-common.h b/drivers/i2c/busses/i2c-viai2c-common.h
new file mode 100644
index 000000000000..fcff8e4456eb
--- /dev/null
+++ b/drivers/i2c/busses/i2c-viai2c-common.h
@@ -0,0 +1,71 @@
+/* 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/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
+
+/* 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
+
+#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;
+ u16 tcr;
+ int irq;
+ u16 cmd_status;
+};
+
+int wmt_i2c_wait_bus_not_busy(struct wmt_i2c_dev *i2c_dev);
+int wmt_check_status(struct wmt_i2c_dev *i2c_dev);
+int wmt_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num);
+int wmt_i2c_init(struct platform_device *pdev, struct wmt_i2c_dev **pi2c_dev);
+
+#endif
diff --git a/drivers/i2c/busses/i2c-viai2c-wmt.c b/drivers/i2c/busses/i2c-viai2c-wmt.c
new file mode 100644
index 000000000000..3125374cc2c0
--- /dev/null
+++ b/drivers/i2c/busses/i2c-viai2c-wmt.c
@@ -0,0 +1,148 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Wondermedia I2C Master Mode Driver
+ *
+ * Copyright (C) 2012 Tony Prisk <linux@xxxxxxxxxxxxxxx>
+ *
+ * Derived from GPLv2+ licensed source:
+ * - Copyright (C) 2008 WonderMedia Technologies, Inc.
+ */
+
+#include <linux/clk.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include "i2c-viai2c-common.h"
+
+#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_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
+
+static u32 wmt_i2c_func(struct i2c_adapter *adap)
+{
+ return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | I2C_FUNC_NOSTART;
+}
+
+static const struct i2c_algorithm wmt_i2c_algo = {
+ .master_xfer = wmt_i2c_xfer,
+ .functionality = wmt_i2c_func,
+};
+
+static int wmt_i2c_reset_hardware(struct wmt_i2c_dev *i2c_dev)
+{
+ int err;
+
+ err = clk_prepare_enable(i2c_dev->clk);
+ if (err) {
+ dev_err(i2c_dev->dev, "failed to enable clock\n");
+ return err;
+ }
+
+ err = clk_set_rate(i2c_dev->clk, 20000000);
+ if (err) {
+ dev_err(i2c_dev->dev, "failed to set clock = 20Mhz\n");
+ clk_disable_unprepare(i2c_dev->clk);
+ 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);
+
+ if (i2c_dev->tcr == TCR_FAST_MODE)
+ writew(SCL_TIMEOUT(128) | TR_HS, i2c_dev->base + REG_TR);
+ else
+ writew(SCL_TIMEOUT(128) | TR_STD, i2c_dev->base + REG_TR);
+
+ return 0;
+}
+
+static int wmt_i2c_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct wmt_i2c_dev *i2c_dev;
+ struct i2c_adapter *adap;
+ int err;
+ u32 clk_rate;
+
+ err = wmt_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);
+ }
+
+ err = of_property_read_u32(np, "clock-frequency", &clk_rate);
+ if (!err && clk_rate == I2C_MAX_FAST_MODE_FREQ)
+ i2c_dev->tcr = TCR_FAST_MODE;
+
+ adap = &i2c_dev->adapter;
+ i2c_set_adapdata(adap, i2c_dev);
+ strscpy(adap->name, "WMT I2C adapter", sizeof(adap->name));
+ adap->owner = THIS_MODULE;
+ adap->algo = &wmt_i2c_algo;
+ adap->dev.parent = &pdev->dev;
+ adap->dev.of_node = pdev->dev.of_node;
+
+ 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)
+ /* wmt_i2c_reset_hardware() enables i2c_dev->clk */
+ clk_disable_unprepare(i2c_dev->clk);
+
+ return err;
+}
+
+static void wmt_i2c_remove(struct platform_device *pdev)
+{
+ struct wmt_i2c_dev *i2c_dev = platform_get_drvdata(pdev);
+
+ /* 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);
+}
+
+static const struct of_device_id wmt_i2c_dt_ids[] = {
+ { .compatible = "wm,wm8505-i2c" },
+ { /* Sentinel */ },
+};
+
+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,
+ },
+};
+
+module_platform_driver(wmt_i2c_driver);
+
+MODULE_DESCRIPTION("Wondermedia I2C master-mode bus adapter");
+MODULE_AUTHOR("Tony Prisk <linux@xxxxxxxxxxxxxxx>");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(of, wmt_i2c_dt_ids);
diff --git a/drivers/i2c/busses/i2c-wmt.c b/drivers/i2c/busses/i2c-wmt.c
deleted file mode 100644
index 76ede433f65c..000000000000
--- a/drivers/i2c/busses/i2c-wmt.c
+++ /dev/null
@@ -1,430 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Wondermedia I2C Master Mode Driver
- *
- * Copyright (C) 2012 Tony Prisk <linux@xxxxxxxxxxxxxxx>
- *
- * 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 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;
- u16 tcr;
- 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;
- unsigned long wait_result;
-
- wait_result = wait_for_completion_timeout(&i2c_dev->complete,
- msecs_to_jiffies(500));
- if (!wait_result)
- return -ETIMEDOUT;
-
- 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 wmt_i2c_dev *i2c_dev, struct i2c_msg *pmsg,
- int last)
-{
- u16 val, tcr_val = i2c_dev->tcr;
- int ret;
- int xfer_len = 0;
-
- 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;
- val |= CR_CPU_RDY;
- writew(val, i2c_dev->base + REG_CR);
- }
-
- reinit_completion(&i2c_dev->complete);
-
- 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) {
- 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 wmt_i2c_dev *i2c_dev, struct i2c_msg *pmsg)
-{
- u16 val, tcr_val = i2c_dev->tcr;
- int ret;
- u32 xfer_len = 0;
-
- val = readw(i2c_dev->base + REG_CR);
- val &= ~(CR_TX_END | CR_TX_NEXT_NO_ACK);
-
- if (!(pmsg->flags & I2C_M_NOSTART))
- val |= CR_CPU_RDY;
-
- if (pmsg->len == 1)
- val |= CR_TX_NEXT_NO_ACK;
-
- writew(val, i2c_dev->base + REG_CR);
-
- reinit_completion(&i2c_dev->complete);
-
- 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);
- }
-
- while (xfer_len < pmsg->len) {
- ret = wmt_check_status(i2c_dev);
- if (ret)
- return ret;
-
- pmsg->buf[xfer_len] = readw(i2c_dev->base + REG_CDR) >> 8;
- xfer_len++;
-
- val = readw(i2c_dev->base + REG_CR) | CR_CPU_RDY;
- if (xfer_len == pmsg->len - 1)
- val |= CR_TX_NEXT_NO_ACK;
- 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;
- int ret = 0;
- struct wmt_i2c_dev *i2c_dev = i2c_get_adapdata(adap);
-
- for (i = 0; ret >= 0 && i < num; i++) {
- pmsg = &msgs[i];
- if (!(pmsg->flags & I2C_M_NOSTART)) {
- ret = wmt_i2c_wait_bus_not_busy(i2c_dev);
- if (ret < 0)
- return ret;
- }
-
- if (pmsg->flags & I2C_M_RD)
- ret = wmt_i2c_read(i2c_dev, pmsg);
- else
- ret = wmt_i2c_write(i2c_dev, pmsg, (i + 1) == num);
- }
-
- return (ret < 0) ? ret : i;
-}
-
-static u32 wmt_i2c_func(struct i2c_adapter *adap)
-{
- return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | I2C_FUNC_NOSTART;
-}
-
-static const struct i2c_algorithm wmt_i2c_algo = {
- .master_xfer = wmt_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_init(struct platform_device *pdev, struct wmt_i2c_dev **pi2c_dev)
-{
- int err;
- struct wmt_i2c_dev *i2c_dev;
- struct device_node *np = pdev->dev.of_node;
-
- 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)
- return -EINVAL;
-
- err = devm_request_irq(&pdev->dev, i2c_dev->irq, wmt_i2c_isr,
- 0, pdev->name, i2c_dev);
- if (err)
- return dev_err_probe(&pdev->dev, err,
- "failed to request irq %i\n", i2c_dev->irq);
-
- i2c_dev->dev = &pdev->dev;
- init_completion(&i2c_dev->complete);
- platform_set_drvdata(pdev, i2c_dev);
-
- *pi2c_dev = i2c_dev;
- return 0;
-}
-
-static int wmt_i2c_reset_hardware(struct wmt_i2c_dev *i2c_dev)
-{
- int err;
-
- err = clk_prepare_enable(i2c_dev->clk);
- if (err) {
- dev_err(i2c_dev->dev, "failed to enable clock\n");
- return err;
- }
-
- err = clk_set_rate(i2c_dev->clk, 20000000);
- if (err) {
- dev_err(i2c_dev->dev, "failed to set clock = 20Mhz\n");
- clk_disable_unprepare(i2c_dev->clk);
- 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);
-
- if (i2c_dev->tcr == TCR_FAST_MODE)
- writew(SCL_TIMEOUT(128) | TR_HS, i2c_dev->base + REG_TR);
- else
- writew(SCL_TIMEOUT(128) | TR_STD, i2c_dev->base + REG_TR);
-
- return 0;
-}
-
-static int wmt_i2c_probe(struct platform_device *pdev)
-{
- struct device_node *np = pdev->dev.of_node;
- struct wmt_i2c_dev *i2c_dev;
- struct i2c_adapter *adap;
- int err;
- u32 clk_rate;
-
- err = wmt_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);
- }
-
- err = of_property_read_u32(np, "clock-frequency", &clk_rate);
- if (!err && clk_rate == I2C_MAX_FAST_MODE_FREQ)
- i2c_dev->tcr = TCR_FAST_MODE;
-
- adap = &i2c_dev->adapter;
- i2c_set_adapdata(adap, i2c_dev);
- strscpy(adap->name, "WMT I2C adapter", sizeof(adap->name));
- adap->owner = THIS_MODULE;
- adap->algo = &wmt_i2c_algo;
- adap->dev.parent = &pdev->dev;
- adap->dev.of_node = pdev->dev.of_node;
-
- 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)
- goto err_disable_clk;
-
- return 0;
-
-err_disable_clk:
- clk_disable_unprepare(i2c_dev->clk);
- return err;
-}
-
-static void wmt_i2c_remove(struct platform_device *pdev)
-{
- struct wmt_i2c_dev *i2c_dev = platform_get_drvdata(pdev);
-
- /* 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);
-}
-
-static const struct of_device_id wmt_i2c_dt_ids[] = {
- { .compatible = "wm,wm8505-i2c" },
- { /* Sentinel */ },
-};
-
-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,
- },
-};
-
-module_platform_driver(wmt_i2c_driver);
-
-MODULE_DESCRIPTION("Wondermedia I2C master-mode bus adapter");
-MODULE_AUTHOR("Tony Prisk <linux@xxxxxxxxxxxxxxx>");
-MODULE_LICENSE("GPL");
-MODULE_DEVICE_TABLE(of, wmt_i2c_dt_ids);
--
2.34.1
