summaryrefslogtreecommitdiff
path: root/arch/arm/plat-s3c24xx/pm.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/plat-s3c24xx/pm.c')
-rw-r--r--arch/arm/plat-s3c24xx/pm.c222
1 files changed, 5 insertions, 217 deletions
diff --git a/arch/arm/plat-s3c24xx/pm.c b/arch/arm/plat-s3c24xx/pm.c
index 062a29339a9..56e5253ca02 100644
--- a/arch/arm/plat-s3c24xx/pm.c
+++ b/arch/arm/plat-s3c24xx/pm.c
@@ -30,6 +30,7 @@
#include <linux/suspend.h>
#include <linux/errno.h>
#include <linux/time.h>
+#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/serial_core.h>
#include <linux/io.h>
@@ -75,43 +76,10 @@ static struct sleep_save core_save[] = {
SAVE_ITEM(S3C2410_CLKSLOW),
};
-static struct gpio_sleep {
- void __iomem *base;
- unsigned int gpcon;
- unsigned int gpdat;
- unsigned int gpup;
-} gpio_save[] = {
- [0] = {
- .base = S3C2410_GPACON,
- },
- [1] = {
- .base = S3C2410_GPBCON,
- },
- [2] = {
- .base = S3C2410_GPCCON,
- },
- [3] = {
- .base = S3C2410_GPDCON,
- },
- [4] = {
- .base = S3C2410_GPECON,
- },
- [5] = {
- .base = S3C2410_GPFCON,
- },
- [6] = {
- .base = S3C2410_GPGCON,
- },
- [7] = {
- .base = S3C2410_GPHCON,
- },
-};
-
static struct sleep_save misc_save[] = {
SAVE_ITEM(S3C2410_DCLKCON),
};
-
/* s3c_pm_check_resume_pin
*
* check to see if the pin is configured correctly for sleep mode, and
@@ -156,195 +124,15 @@ void s3c_pm_configure_extint(void)
* and then configure it as an input if it is not
*/
- for (pin = S3C2410_GPF0; pin <= S3C2410_GPF7; pin++) {
- s3c_pm_check_resume_pin(pin, pin - S3C2410_GPF0);
- }
-
- for (pin = S3C2410_GPG0; pin <= S3C2410_GPG7; pin++) {
- s3c_pm_check_resume_pin(pin, (pin - S3C2410_GPG0)+8);
+ for (pin = S3C2410_GPF(0); pin <= S3C2410_GPF(7); pin++) {
+ s3c_pm_check_resume_pin(pin, pin - S3C2410_GPF(0));
}
-}
-
-/* offsets for CON/DAT/UP registers */
-
-#define OFFS_CON (S3C2410_GPACON - S3C2410_GPACON)
-#define OFFS_DAT (S3C2410_GPADAT - S3C2410_GPACON)
-#define OFFS_UP (S3C2410_GPBUP - S3C2410_GPBCON)
-
-/* s3c_pm_save_gpios()
- *
- * Save the state of the GPIOs
- */
-
-void s3c_pm_save_gpios(void)
-{
- struct gpio_sleep *gps = gpio_save;
- unsigned int gpio;
-
- for (gpio = 0; gpio < ARRAY_SIZE(gpio_save); gpio++, gps++) {
- void __iomem *base = gps->base;
-
- gps->gpcon = __raw_readl(base + OFFS_CON);
- gps->gpdat = __raw_readl(base + OFFS_DAT);
-
- if (gpio > 0)
- gps->gpup = __raw_readl(base + OFFS_UP);
+ for (pin = S3C2410_GPG(0); pin <= S3C2410_GPG(7); pin++) {
+ s3c_pm_check_resume_pin(pin, (pin - S3C2410_GPG(0))+8);
}
}
-/* Test whether the given masked+shifted bits of an GPIO configuration
- * are one of the SFN (special function) modes. */
-
-static inline int is_sfn(unsigned long con)
-{
- return (con == 2 || con == 3);
-}
-
-/* Test if the given masked+shifted GPIO configuration is an input */
-
-static inline int is_in(unsigned long con)
-{
- return con == 0;
-}
-
-/* Test if the given masked+shifted GPIO configuration is an output */
-
-static inline int is_out(unsigned long con)
-{
- return con == 1;
-}
-
-/**
- * s3c2410_pm_restore_gpio() - restore the given GPIO bank
- * @index: The number of the GPIO bank being resumed.
- * @gps: The sleep confgiuration for the bank.
- *
- * Restore one of the GPIO banks that was saved during suspend. This is
- * not as simple as once thought, due to the possibility of glitches
- * from the order that the CON and DAT registers are set in.
- *
- * The three states the pin can be are {IN,OUT,SFN} which gives us 9
- * combinations of changes to check. Three of these, if the pin stays
- * in the same configuration can be discounted. This leaves us with
- * the following:
- *
- * { IN => OUT } Change DAT first
- * { IN => SFN } Change CON first
- * { OUT => SFN } Change CON first, so new data will not glitch
- * { OUT => IN } Change CON first, so new data will not glitch
- * { SFN => IN } Change CON first
- * { SFN => OUT } Change DAT first, so new data will not glitch [1]
- *
- * We do not currently deal with the UP registers as these control
- * weak resistors, so a small delay in change should not need to bring
- * these into the calculations.
- *
- * [1] this assumes that writing to a pin DAT whilst in SFN will set the
- * state for when it is next output.
- */
-
-static void s3c2410_pm_restore_gpio(int index, struct gpio_sleep *gps)
-{
- void __iomem *base = gps->base;
- unsigned long gps_gpcon = gps->gpcon;
- unsigned long gps_gpdat = gps->gpdat;
- unsigned long old_gpcon;
- unsigned long old_gpdat;
- unsigned long old_gpup = 0x0;
- unsigned long gpcon;
- int nr;
-
- old_gpcon = __raw_readl(base + OFFS_CON);
- old_gpdat = __raw_readl(base + OFFS_DAT);
-
- if (base == S3C2410_GPACON) {
- /* GPACON only has one bit per control / data and no PULLUPs.
- * GPACON[x] = 0 => Output, 1 => SFN */
-
- /* first set all SFN bits to SFN */
-
- gpcon = old_gpcon | gps->gpcon;
- __raw_writel(gpcon, base + OFFS_CON);
-
- /* now set all the other bits */
-
- __raw_writel(gps_gpdat, base + OFFS_DAT);
- __raw_writel(gps_gpcon, base + OFFS_CON);
- } else {
- unsigned long old, new, mask;
- unsigned long change_mask = 0x0;
-
- old_gpup = __raw_readl(base + OFFS_UP);
-
- /* Create a change_mask of all the items that need to have
- * their CON value changed before their DAT value, so that
- * we minimise the work between the two settings.
- */
-
- for (nr = 0, mask = 0x03; nr < 32; nr += 2, mask <<= 2) {
- old = (old_gpcon & mask) >> nr;
- new = (gps_gpcon & mask) >> nr;
-
- /* If there is no change, then skip */
-
- if (old == new)
- continue;
-
- /* If both are special function, then skip */
-
- if (is_sfn(old) && is_sfn(new))
- continue;
-
- /* Change is IN => OUT, do not change now */
-
- if (is_in(old) && is_out(new))
- continue;
-
- /* Change is SFN => OUT, do not change now */
-
- if (is_sfn(old) && is_out(new))
- continue;
-
- /* We should now be at the case of IN=>SFN,
- * OUT=>SFN, OUT=>IN, SFN=>IN. */
-
- change_mask |= mask;
- }
-
- /* Write the new CON settings */
-
- gpcon = old_gpcon & ~change_mask;
- gpcon |= gps_gpcon & change_mask;
-
- __raw_writel(gpcon, base + OFFS_CON);
-
- /* Now change any items that require DAT,CON */
-
- __raw_writel(gps_gpdat, base + OFFS_DAT);
- __raw_writel(gps_gpcon, base + OFFS_CON);
- __raw_writel(gps->gpup, base + OFFS_UP);
- }
-
- S3C_PMDBG("GPIO[%d] CON %08lx => %08lx, DAT %08lx => %08lx\n",
- index, old_gpcon, gps_gpcon, old_gpdat, gps_gpdat);
-}
-
-
-/** s3c2410_pm_restore_gpios()
- *
- * Restore the state of the GPIOs
- */
-
-void s3c_pm_restore_gpios(void)
-{
- struct gpio_sleep *gps = gpio_save;
- int gpio;
-
- for (gpio = 0; gpio < ARRAY_SIZE(gpio_save); gpio++, gps++) {
- s3c2410_pm_restore_gpio(gpio, gps);
- }
-}
void s3c_pm_restore_core(void)
{
generated by cgit v1.2.3-70-g09d2 (git 2.51.2) at 2025-11-04 14:39:44 +0000