diff options
| author | avinash philip <avinashphilip@ti.com> | 2013-06-18 00:16:38 +0530 |
|---|---|---|
| committer | Tony Lindgren <tony@atomide.com> | 2013-06-18 03:46:39 -0700 |
| commit | b536dd412b4364df2f9495c6550ee38f6ad3b0fe (patch) | |
| tree | 04cc5bc10a7107e10cf513bded00daca9fac8624 /arch/arm/mach-omap2/gpmc.c | |
| parent | b3f5525c55ce5cb67af06f04dbbf28358da23a2c (diff) | |
| download | lwn-b536dd412b4364df2f9495c6550ee38f6ad3b0fe.tar.gz lwn-b536dd412b4364df2f9495c6550ee38f6ad3b0fe.zip | |
ARM: OMAP2+: gpmc: Low power transition support
GPMC is hardware controller for external memory interfaces.
This patch adds suspend/resume support for GPMC driver.
It also preserves GPMC register configurations across device low-power states
in which GPMC hardware can be powered-off.
gpmc_suspend()/gpmc_resume() are called by default by core PM framework as part
of driver's runtime PM callbacks.
Signed-off-by: Philip Avinash <avinashphilip@ti.com>
Signed-off-by: Pekon Gupta <pekon@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Diffstat (limited to 'arch/arm/mach-omap2/gpmc.c')
| -rw-r--r-- | arch/arm/mach-omap2/gpmc.c | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/arch/arm/mach-omap2/gpmc.c b/arch/arm/mach-omap2/gpmc.c index bac18b3ebbfb..1c7969e965d7 100644 --- a/arch/arm/mach-omap2/gpmc.c +++ b/arch/arm/mach-omap2/gpmc.c @@ -1669,6 +1669,24 @@ static int gpmc_remove(struct platform_device *pdev) return 0; } +#ifdef CONFIG_PM_SLEEP +static int gpmc_suspend(struct device *dev) +{ + omap3_gpmc_save_context(); + pm_runtime_put_sync(dev); + return 0; +} + +static int gpmc_resume(struct device *dev) +{ + pm_runtime_get_sync(dev); + omap3_gpmc_restore_context(); + return 0; +} +#endif + +static SIMPLE_DEV_PM_OPS(gpmc_pm_ops, gpmc_suspend, gpmc_resume); + static struct platform_driver gpmc_driver = { .probe = gpmc_probe, .remove = gpmc_remove, @@ -1676,6 +1694,7 @@ static struct platform_driver gpmc_driver = { .name = DEVICE_NAME, .owner = THIS_MODULE, .of_match_table = of_match_ptr(gpmc_dt_ids), + .pm = &gpmc_pm_ops, }, }; @@ -1738,7 +1757,6 @@ static irqreturn_t gpmc_handle_irq(int irq, void *dev) return IRQ_HANDLED; } -#ifdef CONFIG_ARCH_OMAP3 static struct omap3_gpmc_regs gpmc_context; void omap3_gpmc_save_context(void) @@ -1803,4 +1821,3 @@ void omap3_gpmc_restore_context(void) } } } -#endif /* CONFIG_ARCH_OMAP3 */ |