From mboxrd@z Thu Jan 1 00:00:00 1970 From: eric@eukrea.com (=?utf-8?q?Eric=20B=C3=A9nard?=) Date: Tue, 1 Jun 2010 21:57:44 +0200 Subject: [PATCH v5] i.MX27: add suspend to RAM support In-Reply-To: <20100527214642.GG25921@n2100.arm.linux.org.uk> References: <20100527214642.GG25921@n2100.arm.linux.org.uk> Message-ID: <1275422264-4040-1-git-send-email-eric@eukrea.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Signed-off-by: Eric B?nard --- v5: remove const struct v4: fixed include + const struct v3: return -EINVAL instead of -1 arch/arm/mach-mx2/Makefile | 2 +- arch/arm/mach-mx2/pm-imx27.c | 46 ++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 47 insertions(+), 1 deletions(-) create mode 100644 arch/arm/mach-mx2/pm-imx27.c diff --git a/arch/arm/mach-mx2/Makefile b/arch/arm/mach-mx2/Makefile index e3254fa..27d496c 100644 --- a/arch/arm/mach-mx2/Makefile +++ b/arch/arm/mach-mx2/Makefile @@ -8,7 +8,7 @@ obj-y := devices.o serial.o obj-$(CONFIG_MACH_MX21) += clock_imx21.o mm-imx21.o -obj-$(CONFIG_MACH_MX27) += cpu_imx27.o +obj-$(CONFIG_MACH_MX27) += cpu_imx27.o pm-imx27.o obj-$(CONFIG_MACH_MX27) += clock_imx27.o mm-imx27.o obj-$(CONFIG_MACH_MX21ADS) += mach-mx21ads.o diff --git a/arch/arm/mach-mx2/pm-imx27.c b/arch/arm/mach-mx2/pm-imx27.c new file mode 100644 index 0000000..afc17ce --- /dev/null +++ b/arch/arm/mach-mx2/pm-imx27.c @@ -0,0 +1,46 @@ +/* + * i.MX27 Power Management Routines + * + * Based on Freescale's BSP + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License. + */ + +#include +#include +#include +#include +#include + +static int mx27_suspend_enter(suspend_state_t state) +{ + u32 cscr; + switch (state) { + case PM_SUSPEND_MEM: + /* Clear MPEN and SPEN to disable MPLL/SPLL */ + cscr = __raw_readl(MX27_IO_ADDRESS(MX27_CCM_BASE_ADDR)); + cscr &= 0xFFFFFFFC; + __raw_writel(cscr, MX27_IO_ADDRESS(MX27_CCM_BASE_ADDR)); + /* Executes WFI */ + arch_idle(); + break; + + default: + return -EINVAL; + } + return 0; +} + +static struct platform_suspend_ops mx27_suspend_ops = { + .enter = mx27_suspend_enter, + .valid = suspend_valid_only_mem, +}; + +static int __init mx27_pm_init(void) +{ + suspend_set_ops(&mx27_suspend_ops); + return 0; +} + +device_initcall(mx27_pm_init); -- 1.6.3.3