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gpio/omap: handle save/restore context in GPIO driver

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Modify omap_gpio_prepare_for_idle() & omap_gpio_resume_after_idle() functions
to handle save context & restore context respectively in the OMAP GPIO driver
itself instead of calling these functions from pm specific files.
For this, in gpio_prepare_for_idle(), call *_get_context_loss_count() and in
gpio_resume_after_idle() call it again. If the count is different, do restore
context.

Signed-off-by: Charulatha V <charu@ti.com>
Signed-off-by: Tarun Kanti DebBarma <tarun.kanti@ti.com>
Reviewed-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Reviewed-by: Kevin Hilman <khilman@ti.com>
Signed-off-by: Kevin Hilman <khilman@ti.com>
This commit is contained in:
Tarun Kanti DebBarma 2011-09-29 04:47:25 +05:30
parent 6d62e216b2
commit 60a3437dc9
4 changed files with 63 additions and 90 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/arm/mach-omap2/gpio.c
View File

@ -23,6 +23,7 @@
#include <plat/omap_hwmod.h>
#include <plat/omap_device.h>
#include <plat/omap-pm.h>
#include "powerdomain.h"
@ -55,7 +56,7 @@ static int omap2_gpio_dev_init(struct omap_hwmod *oh, void *unused)
pdata->bank_width = dev_attr->bank_width;
pdata->dbck_flag = dev_attr->dbck_flag;
pdata->virtual_irq_start = IH_GPIO_BASE + 32 * (id - 1);
pdata->get_context_loss_count = omap_pm_get_dev_context_loss_count;
pdata->regs = kzalloc(sizeof(struct omap_gpio_reg_offs), GFP_KERNEL);
if (!pdata) {
pr_err("gpio%d: Memory allocation failed\n", id);

14
arch/arm/mach-omap2/pm34xx.c
View File

@ -75,16 +75,6 @@ static struct powerdomain *mpu_pwrdm, *neon_pwrdm;
static struct powerdomain *core_pwrdm, *per_pwrdm;
static struct powerdomain *cam_pwrdm;
static inline void omap3_per_save_context(void)
{
omap_gpio_save_context();
}
static inline void omap3_per_restore_context(void)
{
omap_gpio_restore_context();
}
static void omap3_enable_io_chain(void)
{
int timeout = 0;
@ -332,8 +322,6 @@ void omap_sram_idle(void)
if (per_next_state < PWRDM_POWER_ON) {
per_going_off = (per_next_state == PWRDM_POWER_OFF) ? 1 : 0;
omap2_gpio_prepare_for_idle(per_going_off);
if (per_next_state == PWRDM_POWER_OFF)
omap3_per_save_context();
}
/* CORE */
@ -399,8 +387,6 @@ void omap_sram_idle(void)
if (per_next_state < PWRDM_POWER_ON) {
per_prev_state = pwrdm_read_prev_pwrst(per_pwrdm);
omap2_gpio_resume_after_idle();
if (per_prev_state == PWRDM_POWER_OFF)
omap3_per_restore_context();
}
/* Disable IO-PAD and IO-CHAIN wakeup */

5
arch/arm/plat-omap/include/plat/gpio.h
View File

@ -201,14 +201,15 @@ struct omap_gpio_platform_data {
bool loses_context; /* whether the bank would ever lose context */
struct omap_gpio_reg_offs *regs;
/* Return context loss count due to PM states changing */
int (*get_context_loss_count)(struct device *dev);
};
extern void omap2_gpio_prepare_for_idle(int off_mode);
extern void omap2_gpio_resume_after_idle(void);
extern void omap_set_gpio_debounce(int gpio, int enable);
extern void omap_set_gpio_debounce_time(int gpio, int enable);
extern void omap_gpio_save_context(void);
extern void omap_gpio_restore_context(void);
/*-------------------------------------------------------------------------*/
/* Wrappers for "new style" GPIO calls, using the new infrastructure

67
drivers/gpio/gpio-omap.c
View File

@ -72,9 +72,11 @@ struct gpio_bank {
bool loses_context;
int stride;
u32 width;
int context_loss_count;
u16 id;
void (*set_dataout)(struct gpio_bank *bank, int gpio, int enable);
int (*get_context_loss_count)(struct device *dev);
struct omap_gpio_reg_offs *regs;
};
@ -1179,6 +1181,7 @@ static int __devinit omap_gpio_probe(struct platform_device *pdev)
bank->stride = pdata->bank_stride;
bank->width = pdata->bank_width;
bank->loses_context = pdata->loses_context;
bank->get_context_loss_count = pdata->get_context_loss_count;
bank->regs = pdata->regs;
if (bank->regs->set_dataout && bank->regs->clr_dataout)
@ -1323,11 +1326,11 @@ static struct syscore_ops omap_gpio_syscore_ops = {
#ifdef CONFIG_ARCH_OMAP2PLUS
static int workaround_enabled;
static void omap_gpio_save_context(struct gpio_bank *bank);
static void omap_gpio_restore_context(struct gpio_bank *bank);
void omap2_gpio_prepare_for_idle(int off_mode)
{
int c = 0;
struct gpio_bank *bank;
list_for_each_entry(bank, &omap_gpio_list, node) {
@ -1347,7 +1350,7 @@ void omap2_gpio_prepare_for_idle(int off_mode)
* non-wakeup GPIOs. Otherwise spurious IRQs will be
* generated. See OMAP2420 Errata item 1.101. */
if (!(bank->enabled_non_wakeup_gpios))
continue;
goto save_gpio_context;
if (cpu_is_omap24xx() || cpu_is_omap34xx()) {
bank->saved_datain = __raw_readl(bank->base +
@ -1384,13 +1387,13 @@ void omap2_gpio_prepare_for_idle(int off_mode)
__raw_writel(l2, bank->base + OMAP4_GPIO_RISINGDETECT);
}
c++;
save_gpio_context:
if (bank->get_context_loss_count)
bank->context_loss_count =
bank->get_context_loss_count(bank->dev);
omap_gpio_save_context(bank);
}
if (!c) {
workaround_enabled = 0;
return;
}
workaround_enabled = 1;
}
void omap2_gpio_resume_after_idle(void)
@ -1398,6 +1401,7 @@ void omap2_gpio_resume_after_idle(void)
struct gpio_bank *bank;
list_for_each_entry(bank, &omap_gpio_list, node) {
int context_lost_cnt_after;
u32 l = 0, gen, gen0, gen1;
int j;
@ -1407,8 +1411,13 @@ void omap2_gpio_resume_after_idle(void)
for (j = 0; j < hweight_long(bank->dbck_enable_mask); j++)
clk_enable(bank->dbck);
if (!workaround_enabled)
continue;
if (bank->get_context_loss_count) {
context_lost_cnt_after =
bank->get_context_loss_count(bank->dev);
if (context_lost_cnt_after != bank->context_loss_count
|| !context_lost_cnt_after)
omap_gpio_restore_context(bank);
}
if (!(bank->enabled_non_wakeup_gpios))
continue;
@ -1486,31 +1495,18 @@ void omap2_gpio_resume_after_idle(void)
}
}
}
}
#endif
#ifdef CONFIG_ARCH_OMAP3
void omap_gpio_save_context(void)
static void omap_gpio_save_context(struct gpio_bank *bank)
{
struct gpio_bank *bank;
list_for_each_entry(bank, &omap_gpio_list, node) {
if (!bank->loses_context)
continue;
bank->context.irqenable1 =
__raw_readl(bank->base + OMAP24XX_GPIO_IRQENABLE1);
bank->context.irqenable2 =
__raw_readl(bank->base + OMAP24XX_GPIO_IRQENABLE2);
bank->context.wake_en =
__raw_readl(bank->base + OMAP24XX_GPIO_WAKE_EN);
bank->context.ctrl =
__raw_readl(bank->base + OMAP24XX_GPIO_CTRL);
bank->context.oe =
__raw_readl(bank->base + OMAP24XX_GPIO_OE);
bank->context.ctrl = __raw_readl(bank->base + OMAP24XX_GPIO_CTRL);
bank->context.oe = __raw_readl(bank->base + OMAP24XX_GPIO_OE);
bank->context.leveldetect0 =
__raw_readl(bank->base + OMAP24XX_GPIO_LEVELDETECT0);
bank->context.leveldetect1 =
@ -1521,28 +1517,18 @@ void omap_gpio_save_context(void)
__raw_readl(bank->base + OMAP24XX_GPIO_FALLINGDETECT);
bank->context.dataout =
__raw_readl(bank->base + OMAP24XX_GPIO_DATAOUT);
}
}
void omap_gpio_restore_context(void)
static void omap_gpio_restore_context(struct gpio_bank *bank)
{
struct gpio_bank *bank;
list_for_each_entry(bank, &omap_gpio_list, node) {
if (!bank->loses_context)
continue;
__raw_writel(bank->context.irqenable1,
bank->base + OMAP24XX_GPIO_IRQENABLE1);
__raw_writel(bank->context.irqenable2,
bank->base + OMAP24XX_GPIO_IRQENABLE2);
__raw_writel(bank->context.wake_en,
bank->base + OMAP24XX_GPIO_WAKE_EN);
__raw_writel(bank->context.ctrl,
bank->base + OMAP24XX_GPIO_CTRL);
__raw_writel(bank->context.oe,
bank->base + OMAP24XX_GPIO_OE);
__raw_writel(bank->context.ctrl, bank->base + OMAP24XX_GPIO_CTRL);
__raw_writel(bank->context.oe, bank->base + OMAP24XX_GPIO_OE);
__raw_writel(bank->context.leveldetect0,
bank->base + OMAP24XX_GPIO_LEVELDETECT0);
__raw_writel(bank->context.leveldetect1,
@ -1553,7 +1539,6 @@ void omap_gpio_restore_context(void)
bank->base + OMAP24XX_GPIO_FALLINGDETECT);
__raw_writel(bank->context.dataout,
bank->base + OMAP24XX_GPIO_DATAOUT);
}
}
#endif