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i2c: stm32f7: allow controller to be wakeup-source 

Allow the i2c-stm32f7 controller to become a wakeup-source
of the system. In such case, when a slave is registered to the
I2C controller, receiving a I2C message targeting that registered
slave address wakes up the suspended system.

In order to be able to wake-up, the I2C controller DT node
must have the property wakeup-source defined and a slave
must be registered.

Signed-off-by: Alain Volmat <alain.volmat@st.com>
Reviewed-by: Pierre-Yves MORDRET <pierre-yves.mordret@st.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Alain Volmat 2020-02-03 18:52:08 +01:00 committed by Wolfram Sang
parent 3a5ee18d2a
commit 419be8e1df
1 changed files with 86 additions and 21 deletions
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107
drivers/i2c/busses/i2c-stm32f7.c
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@ -29,6 +29,7 @@
#include <linux/platform_device.h>
#include <linux/pinctrl/consumer.h>
#include <linux/pm_runtime.h>
#include <linux/pm_wakeirq.h>
#include <linux/regmap.h>
#include <linux/reset.h>
#include <linux/slab.h>
@ -49,6 +50,7 @@
/* STM32F7 I2C control 1 */
#define STM32F7_I2C_CR1_PECEN BIT(23)
#define STM32F7_I2C_CR1_WUPEN BIT(18)
#define STM32F7_I2C_CR1_SBC BIT(16)
#define STM32F7_I2C_CR1_RXDMAEN BIT(15)
#define STM32F7_I2C_CR1_TXDMAEN BIT(14)
@ -301,6 +303,7 @@ struct stm32f7_i2c_msg {
* @dma: dma data
* @use_dma: boolean to know if dma is used in the current transfer
* @regmap: holds SYSCFG phandle for Fast Mode Plus bits
* @wakeup_src: boolean to know if the device is a wakeup source
*/
struct stm32f7_i2c_dev {
struct i2c_adapter adap;
@ -323,6 +326,7 @@ struct stm32f7_i2c_dev {
struct stm32_i2c_dma *dma;
bool use_dma;
struct regmap *regmap;
bool wakeup_src;
};
/*
@ -1691,6 +1695,24 @@ pm_free:
return ret;
}
static void stm32f7_i2c_enable_wakeup(struct stm32f7_i2c_dev *i2c_dev,
bool enable)
{
void __iomem *base = i2c_dev->base;
u32 mask = STM32F7_I2C_CR1_WUPEN;
if (!i2c_dev->wakeup_src)
return;
if (enable) {
device_set_wakeup_enable(i2c_dev->dev, true);
stm32f7_i2c_set_bits(base + STM32F7_I2C_CR1, mask);
} else {
device_set_wakeup_enable(i2c_dev->dev, false);
stm32f7_i2c_clr_bits(base + STM32F7_I2C_CR1, mask);
}
}
static int stm32f7_i2c_reg_slave(struct i2c_client *slave)
{
struct stm32f7_i2c_dev *i2c_dev = i2c_get_adapdata(slave->adapter);
@ -1717,6 +1739,9 @@ static int stm32f7_i2c_reg_slave(struct i2c_client *slave)
if (ret < 0)
return ret;
if (!stm32f7_i2c_is_slave_registered(i2c_dev))
stm32f7_i2c_enable_wakeup(i2c_dev, true);
if (id == 0) {
/* Configure Own Address 1 */
oar1 = readl_relaxed(i2c_dev->base + STM32F7_I2C_OAR1);
@ -1758,6 +1783,9 @@ static int stm32f7_i2c_reg_slave(struct i2c_client *slave)
ret = 0;
pm_free:
if (!stm32f7_i2c_is_slave_registered(i2c_dev))
stm32f7_i2c_enable_wakeup(i2c_dev, false);
pm_runtime_mark_last_busy(dev);
pm_runtime_put_autosuspend(dev);
@ -1791,8 +1819,10 @@ static int stm32f7_i2c_unreg_slave(struct i2c_client *slave)
i2c_dev->slave[id] = NULL;
if (!(stm32f7_i2c_is_slave_registered(i2c_dev)))
if (!stm32f7_i2c_is_slave_registered(i2c_dev)) {
stm32f7_i2c_disable_irq(i2c_dev, STM32F7_I2C_ALL_IRQ_MASK);
stm32f7_i2c_enable_wakeup(i2c_dev, false);
}
pm_runtime_mark_last_busy(i2c_dev->dev);
pm_runtime_put_autosuspend(i2c_dev->dev);
@ -1879,6 +1909,9 @@ static int stm32f7_i2c_probe(struct platform_device *pdev)
return irq_error ? : -ENOENT;
}
i2c_dev->wakeup_src = of_property_read_bool(pdev->dev.of_node,
"wakeup-source");
i2c_dev->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(i2c_dev->clk)) {
dev_err(&pdev->dev, "Error: Missing controller clock\n");
@ -1985,6 +2018,16 @@ static int stm32f7_i2c_probe(struct platform_device *pdev)
goto clk_free;
}
if (i2c_dev->wakeup_src) {
device_set_wakeup_capable(i2c_dev->dev, true);
ret = dev_pm_set_wake_irq(i2c_dev->dev, irq_event);
if (ret) {
dev_err(i2c_dev->dev, "Failed to set wake up irq\n");
goto clr_wakeup_capable;
}
}
platform_set_drvdata(pdev, i2c_dev);
pm_runtime_set_autosuspend_delay(i2c_dev->dev,
@ -2014,6 +2057,13 @@ pm_disable:
pm_runtime_set_suspended(i2c_dev->dev);
pm_runtime_dont_use_autosuspend(i2c_dev->dev);
if (i2c_dev->wakeup_src)
dev_pm_clear_wake_irq(i2c_dev->dev);
clr_wakeup_capable:
if (i2c_dev->wakeup_src)
device_set_wakeup_capable(i2c_dev->dev, false);
if (i2c_dev->dma) {
stm32_i2c_dma_free(i2c_dev->dma);
i2c_dev->dma = NULL;
@ -2032,6 +2082,15 @@ static int stm32f7_i2c_remove(struct platform_device *pdev)
i2c_del_adapter(&i2c_dev->adap);
pm_runtime_get_sync(i2c_dev->dev);
if (i2c_dev->wakeup_src) {
dev_pm_clear_wake_irq(i2c_dev->dev);
/*
* enforce that wakeup is disabled and that the device
* is marked as non wakeup capable
*/
device_init_wakeup(i2c_dev->dev, false);
}
pm_runtime_put_noidle(i2c_dev->dev);
pm_runtime_disable(i2c_dev->dev);
pm_runtime_set_suspended(i2c_dev->dev);
@ -2073,8 +2132,8 @@ static int __maybe_unused stm32f7_i2c_runtime_resume(struct device *dev)
return 0;
}
static int __maybe_unused
stm32f7_i2c_regs_backup(struct stm32f7_i2c_dev *i2c_dev)
#ifdef CONFIG_PM_SLEEP
static int stm32f7_i2c_regs_backup(struct stm32f7_i2c_dev *i2c_dev)
{
int ret;
struct stm32f7_i2c_regs *backup_regs = &i2c_dev->backup_regs;
@ -2095,8 +2154,7 @@ stm32f7_i2c_regs_backup(struct stm32f7_i2c_dev *i2c_dev)
return ret;
}
static int __maybe_unused
stm32f7_i2c_regs_restore(struct stm32f7_i2c_dev *i2c_dev)
static int stm32f7_i2c_regs_restore(struct stm32f7_i2c_dev *i2c_dev)
{
u32 cr1;
int ret;
@ -2127,41 +2185,48 @@ stm32f7_i2c_regs_restore(struct stm32f7_i2c_dev *i2c_dev)
return ret;
}
static int __maybe_unused stm32f7_i2c_suspend(struct device *dev)
static int stm32f7_i2c_suspend(struct device *dev)
{
struct stm32f7_i2c_dev *i2c_dev = dev_get_drvdata(dev);
int ret;
i2c_mark_adapter_suspended(&i2c_dev->adap);
ret = stm32f7_i2c_regs_backup(i2c_dev);
if (ret < 0) {
i2c_mark_adapter_resumed(&i2c_dev->adap);
return ret;
}
pinctrl_pm_select_sleep_state(dev);
pm_runtime_force_suspend(dev);
if (!device_may_wakeup(dev) && !dev->power.wakeup_path) {
ret = stm32f7_i2c_regs_backup(i2c_dev);
if (ret < 0) {
i2c_mark_adapter_resumed(&i2c_dev->adap);
return ret;
}
pinctrl_pm_select_sleep_state(dev);
pm_runtime_force_suspend(dev);
}
return 0;
}
static int __maybe_unused stm32f7_i2c_resume(struct device *dev)
static int stm32f7_i2c_resume(struct device *dev)
{
struct stm32f7_i2c_dev *i2c_dev = dev_get_drvdata(dev);
int ret;
ret = pm_runtime_force_resume(dev);
if (ret < 0)
return ret;
pinctrl_pm_select_default_state(dev);
if (!device_may_wakeup(dev) && !dev->power.wakeup_path) {
ret = pm_runtime_force_resume(dev);
if (ret < 0)
return ret;
pinctrl_pm_select_default_state(dev);
ret = stm32f7_i2c_regs_restore(i2c_dev);
if (ret < 0)
return ret;
}
ret = stm32f7_i2c_regs_restore(i2c_dev);
if (ret < 0)
return ret;
i2c_mark_adapter_resumed(&i2c_dev->adap);
return 0;
}
#endif
static const struct dev_pm_ops stm32f7_i2c_pm_ops = {
SET_RUNTIME_PM_OPS(stm32f7_i2c_runtime_suspend,