[PATCH v5 02/22] gpio/omap: use flag to identify wakeup domain

Tarun Kanti DebBarma
2011-08-04T11:05:28Z

From: Charulatha V <charu@ti.com>

In omap3, save/restore context is implemented for GPIO banks 2-6 as GPIO bank1
is in wakeup domain. Instead of identifying bank's power domain by bank id,
use 'loses_context' flag which is filled by pwrdm_can_ever_lose_context()
during dev_init.

For getting the powerdomain pointer, omap_hwmod_get_pwrdm() is used.
omap_device_get_pwrdm() could not be used as the pwrdm information needs to be
filled in pdata, whereas omap_device_get_pwrdm() could be used only after
omap_device_build() call.

Signed-off-by: Charulatha V <charu@ti.com>
---
arch/arm/mach-omap2/gpio.c | 6 ++++++
arch/arm/plat-omap/include/plat/gpio.h | 1 +
drivers/gpio/gpio-omap.c | 13 ++++++-------
3 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/arch/arm/mach-omap2/gpio.c b/arch/arm/mach-omap2/gpio.c
index f805cda..95195a8 100644
--- a/arch/arm/mach-omap2/gpio.c
+++ b/arch/arm/mach-omap2/gpio.c
@@ -24,6 +24,8 @@
#include <plat/omap_hwmod.h>
#include <plat/omap_device.h>

+#include "powerdomain.h"
+
static struct omap_device_pm_latency omap_gpio_latency[] = {
[0] = {
.deactivate_func = omap_device_idle_hwmods,
@@ -39,6 +41,7 @@ static int omap2_gpio_dev_init(struct omap_hwmod *oh, void *unused)
struct omap_gpio_dev_attr *dev_attr;
char *name = "omap_gpio";
int id;
+ struct powerdomain *pwrdm;

/*
* extract the device id from name field available in the
@@ -107,6 +110,9 @@ static int omap2_gpio_dev_init(struct omap_hwmod *oh, void *unused)
return -EINVAL;
}

+ pwrdm = omap_hwmod_get_pwrdm(oh);
+ pdata->loses_context = pwrdm_can_ever_lose_context(pwrdm);
+
od = omap_device_build(name, id - 1, oh, pdata,
sizeof(*pdata), omap_gpio_latency,
ARRAY_SIZE(omap_gpio_latency),
diff --git a/arch/arm/plat-omap/include/plat/gpio.h b/arch/arm/plat-omap/include/plat/gpio.h
index dd330ed..58d0bf2 100644
--- a/arch/arm/plat-omap/include/plat/gpio.h
+++ b/arch/arm/plat-omap/include/plat/gpio.h
@@ -198,6 +198,7 @@ struct omap_gpio_platform_data {
int bank_width; /* GPIO bank width */
int bank_stride; /* Only needed for omap1 MPUIO */
bool dbck_flag; /* dbck required or not - True for OMAP3&4 */
+ bool loses_context; /* whether the bank would ever lose context */

struct omap_gpio_reg_offs *regs;
};
diff --git a/drivers/gpio/gpio-omap.c b/drivers/gpio/gpio-omap.c
index 13d5ca4..aaf07b8 100644
--- a/drivers/gpio/gpio-omap.c
+++ b/drivers/gpio/gpio-omap.c
@@ -56,6 +56,7 @@ struct gpio_bank {
u32 dbck_enable_mask;
struct device *dev;
bool dbck_flag;
+ bool loses_context;
int stride;
u32 width;
u16 id;
@@ -1176,7 +1177,7 @@ static int __devinit omap_gpio_probe(struct platform_device *pdev)
bank->dbck_flag = pdata->dbck_flag;
bank->stride = pdata->bank_stride;
bank->width = pdata->bank_width;
-
+ bank->loses_context = pdata->loses_context;
bank->regs = pdata->regs;

if (bank->regs->set_dataout && bank->regs->clr_dataout)
@@ -1332,8 +1333,7 @@ void omap2_gpio_prepare_for_idle(int off_mode)
u32 l1 = 0, l2 = 0;
int j;

- /* TODO: Do not use cpu_is_omap34xx */
- if ((cpu_is_omap34xx()) && (bank->id == 0))
+ if (!bank->loses_context)
continue;

for (j = 0; j < hweight_long(bank->dbck_enable_mask); j++)
@@ -1400,8 +1400,7 @@ void omap2_gpio_resume_after_idle(void)
u32 l = 0, gen, gen0, gen1;
int j;

- /* TODO: Do not use cpu_is_omap34xx */
- if ((cpu_is_omap34xx()) && (bank->id == 0))
+ if (!bank->loses_context)
continue;

for (j = 0; j < hweight_long(bank->dbck_enable_mask); j++)
@@ -1500,7 +1499,7 @@ void omap_gpio_save_context(void)
list_for_each_entry(bank, &omap_gpio_list, node) {
i++;

- if (bank->id == 0)
+ if (!bank->loses_context)
continue;

gpio_context[i].irqenable1 =
@@ -1534,7 +1533,7 @@ void omap_gpio_restore_context(void)
list_for_each_entry(bank, &omap_gpio_list, node) {
i++;

- if (bank->id == 0)
+ if (!bank->loses_context)
continue;

__raw_writel(gpio_context[i].irqenable1,
--
1.7.0.4