diff options
author | Shawn Guo <shawn.guo@linaro.org> | 2011-09-06 09:08:40 +0200 |
---|---|---|
committer | Arnd Bergmann <arnd@arndb.de> | 2011-10-31 14:26:27 +0100 |
commit | a1f1c7efb0c1c78b5e84455bb5a6c8b2bee3059c (patch) | |
tree | 732ecae274d63faa98d4e3fa9091592bfb7ed9a4 /arch/arm/mach-imx/pm-imx6q.c | |
parent | arm/imx6q: add device tree machine support (diff) | |
download | linux-a1f1c7efb0c1c78b5e84455bb5a6c8b2bee3059c.tar.xz linux-a1f1c7efb0c1c78b5e84455bb5a6c8b2bee3059c.zip |
arm/imx6q: add suspend/resume support
It adds suspend/resume support for imx6q.
Signed-off-by: Anson Huang <b20788@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Diffstat (limited to 'arch/arm/mach-imx/pm-imx6q.c')
-rw-r--r-- | arch/arm/mach-imx/pm-imx6q.c | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/arch/arm/mach-imx/pm-imx6q.c b/arch/arm/mach-imx/pm-imx6q.c new file mode 100644 index 000000000000..f20f191d7cca --- /dev/null +++ b/arch/arm/mach-imx/pm-imx6q.c @@ -0,0 +1,70 @@ +/* + * Copyright 2011 Freescale Semiconductor, Inc. + * Copyright 2011 Linaro Ltd. + * + * The code contained herein is licensed under the GNU General Public + * License. You may obtain a copy of the GNU General Public License + * Version 2 or later at the following locations: + * + * http://www.opensource.org/licenses/gpl-license.html + * http://www.gnu.org/copyleft/gpl.html + */ + +#include <linux/init.h> +#include <linux/io.h> +#include <linux/of.h> +#include <linux/suspend.h> +#include <asm/cacheflush.h> +#include <asm/proc-fns.h> +#include <asm/suspend.h> +#include <asm/hardware/cache-l2x0.h> +#include <mach/common.h> +#include <mach/hardware.h> + +extern unsigned long phys_l2x0_saved_regs; + +static int imx6q_suspend_finish(unsigned long val) +{ + cpu_do_idle(); + return 0; +} + +static int imx6q_pm_enter(suspend_state_t state) +{ + switch (state) { + case PM_SUSPEND_MEM: + imx6q_set_lpm(STOP_POWER_OFF); + imx_gpc_pre_suspend(); + imx_set_cpu_jump(0, v7_cpu_resume); + /* Zzz ... */ + cpu_suspend(0, imx6q_suspend_finish); + imx_smp_prepare(); + imx_gpc_post_resume(); + break; + default: + return -EINVAL; + } + + return 0; +} + +static const struct platform_suspend_ops imx6q_pm_ops = { + .enter = imx6q_pm_enter, + .valid = suspend_valid_only_mem, +}; + +void __init imx6q_pm_init(void) +{ + /* + * The l2x0 core code provides an infrastucture to save and restore + * l2x0 registers across suspend/resume cycle. But because imx6q + * retains L2 content during suspend and needs to resume L2 before + * MMU is enabled, it can only utilize register saving support and + * have to take care of restoring on its own. So we save physical + * address of the data structure used by l2x0 core to save registers, + * and later restore the necessary ones in imx6q resume entry. + */ + phys_l2x0_saved_regs = __pa(&l2x0_saved_regs); + + suspend_set_ops(&imx6q_pm_ops); +} |