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i2c: iproc: Add suspend/resume support

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Add suspend/resume support to the Broadcom iProc I2C driver

Signed-off-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Ray Jui 2015-05-14 15:36:04 -07:00 committed by Wolfram Sang
parent 8503ff1665
commit 0ee04e91ea
1 changed files with 57 additions and 0 deletions
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57
drivers/i2c/busses/i2c-bcm-iproc.c
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@ -91,6 +91,7 @@ struct bcm_iproc_i2c_dev {
void __iomem *base;
struct i2c_adapter adapter;
unsigned int bus_speed;
struct completion done;
int xfer_is_done;
@ -309,6 +310,7 @@ static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *iproc_i2c)
bus_speed = 400000;
}
iproc_i2c->bus_speed = bus_speed;
val = readl(iproc_i2c->base + TIM_CFG_OFFSET);
val &= ~(1 << TIM_CFG_MODE_400_SHIFT);
val |= (bus_speed == 400000) << TIM_CFG_MODE_400_SHIFT;
@ -439,6 +441,60 @@ static int bcm_iproc_i2c_remove(struct platform_device *pdev)
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int bcm_iproc_i2c_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
/* make sure there's no pending interrupt when we go into suspend */
writel(0, iproc_i2c->base + IE_OFFSET);
readl(iproc_i2c->base + IE_OFFSET);
synchronize_irq(iproc_i2c->irq);
/* now disable the controller */
bcm_iproc_i2c_enable_disable(iproc_i2c, false);
return 0;
}
static int bcm_iproc_i2c_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct bcm_iproc_i2c_dev *iproc_i2c = platform_get_drvdata(pdev);
int ret;
u32 val;
/*
* Power domain could have been shut off completely in system deep
* sleep, so re-initialize the block here
*/
ret = bcm_iproc_i2c_init(iproc_i2c);
if (ret)
return ret;
/* configure to the desired bus speed */
val = readl(iproc_i2c->base + TIM_CFG_OFFSET);
val &= ~(1 << TIM_CFG_MODE_400_SHIFT);
val |= (iproc_i2c->bus_speed == 400000) << TIM_CFG_MODE_400_SHIFT;
writel(val, iproc_i2c->base + TIM_CFG_OFFSET);
bcm_iproc_i2c_enable_disable(iproc_i2c, true);
return 0;
}
static const struct dev_pm_ops bcm_iproc_i2c_pm_ops = {
.suspend_late = &bcm_iproc_i2c_suspend,
.resume_early = &bcm_iproc_i2c_resume
};
#define BCM_IPROC_I2C_PM_OPS (&bcm_iproc_i2c_pm_ops)
#else
#define BCM_IPROC_I2C_PM_OPS NULL
#endif /* CONFIG_PM_SLEEP */
static const struct of_device_id bcm_iproc_i2c_of_match[] = {
{ .compatible = "brcm,iproc-i2c" },
{ /* sentinel */ }
@ -449,6 +505,7 @@ static struct platform_driver bcm_iproc_i2c_driver = {
.driver = {
.name = "bcm-iproc-i2c",
.of_match_table = bcm_iproc_i2c_of_match,
.pm = BCM_IPROC_I2C_PM_OPS,
},
.probe = bcm_iproc_i2c_probe,
.remove = bcm_iproc_i2c_remove,