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authorAlexandre Belloni <alexandre.belloni@free-electrons.com>2017-04-06 15:36:23 +0200
committerLinus Walleij <linus.walleij@linaro.org>2017-04-07 14:32:51 +0200
commitba9e7f2794d8158c93aacd279830a6f1f98b19b0 (patch)
tree68d98fa179f3d28fa50406f9aa163e7ff048ee0a /drivers/pinctrl
parent8d5e7c5df0a6c442373628be5221321172b1badf (diff)
pinctrl: at91-pio4: handle suspend to ram
When suspending to RAM, the power to the core is cut and the register values are lost. Save and restore more registers than just IMR. Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/pinctrl')
-rw-r--r--drivers/pinctrl/pinctrl-at91-pio4.c34
1 files changed, 28 insertions, 6 deletions
diff --git a/drivers/pinctrl/pinctrl-at91-pio4.c b/drivers/pinctrl/pinctrl-at91-pio4.c
index 28bbc1bb9e6c..dc8591543dee 100644
--- a/drivers/pinctrl/pinctrl-at91-pio4.c
+++ b/drivers/pinctrl/pinctrl-at91-pio4.c
@@ -126,7 +126,11 @@ struct atmel_pioctrl {
struct irq_domain *irq_domain;
int *irqs;
unsigned *pm_wakeup_sources;
- unsigned *pm_suspend_backup;
+ struct {
+ u32 imr;
+ u32 odsr;
+ u32 cfgr[ATMEL_PIO_NPINS_PER_BANK];
+ } *pm_suspend_backup;
struct device *dev;
struct device_node *node;
};
@@ -830,17 +834,26 @@ static int __maybe_unused atmel_pctrl_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct atmel_pioctrl *atmel_pioctrl = platform_get_drvdata(pdev);
- int i;
+ int i, j;
/*
* For each bank, save IMR to restore it later and disable all GPIO
* interrupts excepting the ones marked as wakeup sources.
*/
for (i = 0; i < atmel_pioctrl->nbanks; i++) {
- atmel_pioctrl->pm_suspend_backup[i] =
+ atmel_pioctrl->pm_suspend_backup[i].imr =
atmel_gpio_read(atmel_pioctrl, i, ATMEL_PIO_IMR);
atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_IDR,
~atmel_pioctrl->pm_wakeup_sources[i]);
+ atmel_pioctrl->pm_suspend_backup[i].odsr =
+ atmel_gpio_read(atmel_pioctrl, i, ATMEL_PIO_ODSR);
+ for (j = 0; j < ATMEL_PIO_NPINS_PER_BANK; j++) {
+ atmel_gpio_write(atmel_pioctrl, i,
+ ATMEL_PIO_MSKR, BIT(j));
+ atmel_pioctrl->pm_suspend_backup[i].cfgr[j] =
+ atmel_gpio_read(atmel_pioctrl, i,
+ ATMEL_PIO_CFGR);
+ }
}
return 0;
@@ -850,11 +863,20 @@ static int __maybe_unused atmel_pctrl_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct atmel_pioctrl *atmel_pioctrl = platform_get_drvdata(pdev);
- int i;
+ int i, j;
- for (i = 0; i < atmel_pioctrl->nbanks; i++)
+ for (i = 0; i < atmel_pioctrl->nbanks; i++) {
atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_IER,
- atmel_pioctrl->pm_suspend_backup[i]);
+ atmel_pioctrl->pm_suspend_backup[i].imr);
+ atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_SODR,
+ atmel_pioctrl->pm_suspend_backup[i].odsr);
+ for (j = 0; j < ATMEL_PIO_NPINS_PER_BANK; j++) {
+ atmel_gpio_write(atmel_pioctrl, i,
+ ATMEL_PIO_MSKR, BIT(j));
+ atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_CFGR,
+ atmel_pioctrl->pm_suspend_backup[i].cfgr[j]);
+ }
+ }
return 0;
}