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path: root/drivers/i2c/busses/i2c-imx.c
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Diffstat (limited to 'drivers/i2c/busses/i2c-imx.c')
-rw-r--r--drivers/i2c/busses/i2c-imx.c109
1 files changed, 81 insertions, 28 deletions
diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c
index d4d853680..a2b132cef 100644
--- a/drivers/i2c/busses/i2c-imx.c
+++ b/drivers/i2c/busses/i2c-imx.c
@@ -29,9 +29,6 @@
*
*/
-/** Includes *******************************************************************
-*******************************************************************************/
-
#include <linux/clk.h>
#include <linux/completion.h>
#include <linux/delay.h>
@@ -53,12 +50,10 @@
#include <linux/pinctrl/consumer.h>
#include <linux/platform_data/i2c-imx.h>
#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
#include <linux/sched.h>
#include <linux/slab.h>
-/** Defines ********************************************************************
-*******************************************************************************/
-
/* This will be the driver name the kernel reports */
#define DRIVER_NAME "imx-i2c"
@@ -120,8 +115,7 @@
#define I2CR_IEN_OPCODE_0 0x0
#define I2CR_IEN_OPCODE_1 I2CR_IEN
-/** Variables ******************************************************************
-*******************************************************************************/
+#define I2C_PM_TIMEOUT 10 /* ms */
/*
* sorted list of clock divider, register value pairs
@@ -346,7 +340,7 @@ fail_tx:
dma_release_channel(dma->chan_tx);
fail_al:
devm_kfree(dev, dma);
- dev_info(dev, "can't use DMA\n");
+ dev_info(dev, "can't use DMA, using PIO instead.\n");
}
static void i2c_imx_dma_callback(void *arg)
@@ -393,6 +387,7 @@ static int i2c_imx_dma_xfer(struct imx_i2c_struct *i2c_imx,
return 0;
err_submit:
+ dmaengine_terminate_all(dma->chan_using);
err_desc:
dma_unmap_single(chan_dev, dma->dma_buf,
dma->dma_len, dma->dma_data_dir);
@@ -416,9 +411,6 @@ static void i2c_imx_dma_free(struct imx_i2c_struct *i2c_imx)
dma->chan_using = NULL;
}
-/** Functions for IMX I2C adapter driver ***************************************
-*******************************************************************************/
-
static int i2c_imx_bus_busy(struct imx_i2c_struct *i2c_imx, int for_busy)
{
unsigned long orig_jiffies = jiffies;
@@ -527,9 +519,6 @@ static int i2c_imx_start(struct imx_i2c_struct *i2c_imx)
i2c_imx_set_clk(i2c_imx);
- result = clk_prepare_enable(i2c_imx->clk);
- if (result)
- return result;
imx_i2c_write_reg(i2c_imx->ifdr, i2c_imx, IMX_I2C_IFDR);
/* Enable I2C controller */
imx_i2c_write_reg(i2c_imx->hwdata->i2sr_clr_opcode, i2c_imx, IMX_I2C_I2SR);
@@ -582,7 +571,6 @@ static void i2c_imx_stop(struct imx_i2c_struct *i2c_imx)
/* Disable I2C controller */
temp = i2c_imx->hwdata->i2cr_ien_opcode ^ I2CR_IEN,
imx_i2c_write_reg(temp, i2c_imx, IMX_I2C_I2CR);
- clk_disable_unprepare(i2c_imx->clk);
}
static irqreturn_t i2c_imx_isr(int irq, void *dev_id)
@@ -901,6 +889,10 @@ static int i2c_imx_xfer(struct i2c_adapter *adapter,
dev_dbg(&i2c_imx->adapter.dev, "<%s>\n", __func__);
+ result = pm_runtime_get_sync(i2c_imx->adapter.dev.parent);
+ if (result < 0)
+ goto out;
+
/* Start I2C transfer */
result = i2c_imx_start(i2c_imx);
if (result) {
@@ -964,6 +956,10 @@ fail0:
/* Stop I2C transfer */
i2c_imx_stop(i2c_imx);
+ pm_runtime_mark_last_busy(i2c_imx->adapter.dev.parent);
+ pm_runtime_put_autosuspend(i2c_imx->adapter.dev.parent);
+
+out:
dev_dbg(&i2c_imx->adapter.dev, "<%s> exit with: %s: %d\n", __func__,
(result < 0) ? "error" : "success msg",
(result < 0) ? result : num);
@@ -997,10 +993,8 @@ static void i2c_imx_init_recovery_info(struct imx_i2c_struct *i2c_imx,
PINCTRL_STATE_DEFAULT);
i2c_imx->pinctrl_pins_gpio = pinctrl_lookup_state(i2c_imx->pinctrl,
"gpio");
- rinfo->sda_gpio = of_get_named_gpio_flags(pdev->dev.of_node,
- "sda-gpios", 0, NULL);
- rinfo->scl_gpio = of_get_named_gpio_flags(pdev->dev.of_node,
- "scl-gpios", 0, NULL);
+ rinfo->sda_gpio = of_get_named_gpio(pdev->dev.of_node, "sda-gpios", 0);
+ rinfo->scl_gpio = of_get_named_gpio(pdev->dev.of_node, "scl-gpios", 0);
if (!gpio_is_valid(rinfo->sda_gpio) ||
!gpio_is_valid(rinfo->scl_gpio) ||
@@ -1083,7 +1077,7 @@ static int i2c_imx_probe(struct platform_device *pdev)
ret = clk_prepare_enable(i2c_imx->clk);
if (ret) {
- dev_err(&pdev->dev, "can't enable I2C clock\n");
+ dev_err(&pdev->dev, "can't enable I2C clock, ret=%d\n", ret);
return ret;
}
@@ -1107,6 +1101,18 @@ static int i2c_imx_probe(struct platform_device *pdev)
/* Set up adapter data */
i2c_set_adapdata(&i2c_imx->adapter, i2c_imx);
+ /* Set up platform driver data */
+ platform_set_drvdata(pdev, i2c_imx);
+
+ pm_runtime_set_autosuspend_delay(&pdev->dev, I2C_PM_TIMEOUT);
+ pm_runtime_use_autosuspend(&pdev->dev);
+ pm_runtime_set_active(&pdev->dev);
+ pm_runtime_enable(&pdev->dev);
+
+ ret = pm_runtime_get_sync(&pdev->dev);
+ if (ret < 0)
+ goto rpm_disable;
+
/* Set up clock divider */
i2c_imx->bitrate = IMX_I2C_BIT_RATE;
ret = of_property_read_u32(pdev->dev.of_node,
@@ -1125,12 +1131,11 @@ static int i2c_imx_probe(struct platform_device *pdev)
ret = i2c_add_numbered_adapter(&i2c_imx->adapter);
if (ret < 0) {
dev_err(&pdev->dev, "registration failed\n");
- goto clk_disable;
+ goto rpm_disable;
}
- /* Set up platform driver data */
- platform_set_drvdata(pdev, i2c_imx);
- clk_disable_unprepare(i2c_imx->clk);
+ pm_runtime_mark_last_busy(&pdev->dev);
+ pm_runtime_put_autosuspend(&pdev->dev);
dev_dbg(&i2c_imx->adapter.dev, "claimed irq %d\n", irq);
dev_dbg(&i2c_imx->adapter.dev, "device resources: %pR\n", res);
@@ -1143,6 +1148,12 @@ static int i2c_imx_probe(struct platform_device *pdev)
return 0; /* Return OK */
+rpm_disable:
+ pm_runtime_put_noidle(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
+ pm_runtime_set_suspended(&pdev->dev);
+ pm_runtime_dont_use_autosuspend(&pdev->dev);
+
clk_disable:
clk_disable_unprepare(i2c_imx->clk);
return ret;
@@ -1151,6 +1162,11 @@ clk_disable:
static int i2c_imx_remove(struct platform_device *pdev)
{
struct imx_i2c_struct *i2c_imx = platform_get_drvdata(pdev);
+ int ret;
+
+ ret = pm_runtime_get_sync(&pdev->dev);
+ if (ret < 0)
+ return ret;
/* remove adapter */
dev_dbg(&i2c_imx->adapter.dev, "adapter removed\n");
@@ -1165,17 +1181,54 @@ static int i2c_imx_remove(struct platform_device *pdev)
imx_i2c_write_reg(0, i2c_imx, IMX_I2C_I2CR);
imx_i2c_write_reg(0, i2c_imx, IMX_I2C_I2SR);
+ clk_disable_unprepare(i2c_imx->clk);
+
+ pm_runtime_put_noidle(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int i2c_imx_runtime_suspend(struct device *dev)
+{
+ struct imx_i2c_struct *i2c_imx = dev_get_drvdata(dev);
+
+ clk_disable_unprepare(i2c_imx->clk);
+
return 0;
}
+static int i2c_imx_runtime_resume(struct device *dev)
+{
+ struct imx_i2c_struct *i2c_imx = dev_get_drvdata(dev);
+ int ret;
+
+ ret = clk_prepare_enable(i2c_imx->clk);
+ if (ret)
+ dev_err(dev, "can't enable I2C clock, ret=%d\n", ret);
+
+ return ret;
+}
+
+static const struct dev_pm_ops i2c_imx_pm_ops = {
+ SET_RUNTIME_PM_OPS(i2c_imx_runtime_suspend,
+ i2c_imx_runtime_resume, NULL)
+};
+#define I2C_IMX_PM_OPS (&i2c_imx_pm_ops)
+#else
+#define I2C_IMX_PM_OPS NULL
+#endif /* CONFIG_PM */
+
static struct platform_driver i2c_imx_driver = {
.probe = i2c_imx_probe,
.remove = i2c_imx_remove,
- .driver = {
- .name = DRIVER_NAME,
+ .driver = {
+ .name = DRIVER_NAME,
+ .pm = I2C_IMX_PM_OPS,
.of_match_table = i2c_imx_dt_ids,
},
- .id_table = imx_i2c_devtype,
+ .id_table = imx_i2c_devtype,
};
static int __init i2c_adap_imx_init(void)