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    Subject[PATCHv3 3/3] ARM: mx51: Add support for low power suspend on MX51
    Date
    From: Dinh Nguyen <Dinh.Nguyen@freescale.com>

    Adds initial low power suspend functionality to MX51.
    Supports "mem" and "standby" modes.

    Tested on mx51-babbage.

    Signed-off-by: Dinh Nguyen <Dinh.Nguyen@freescale.com>
    ---
    arch/arm/mach-mx5/Makefile | 1 +
    arch/arm/mach-mx5/pm-imx51.c | 69 ++++++++++++++++++++++++++++++++++++++++++
    2 files changed, 70 insertions(+), 0 deletions(-)
    create mode 100644 arch/arm/mach-mx5/pm-imx51.c

    diff --git a/arch/arm/mach-mx5/Makefile b/arch/arm/mach-mx5/Makefile
    index 0b9338c..787cb80 100644
    --- a/arch/arm/mach-mx5/Makefile
    +++ b/arch/arm/mach-mx5/Makefile
    @@ -6,6 +6,7 @@
    obj-y := cpu.o mm.o clock-mx51-mx53.o devices.o ehci.o system.o
    obj-$(CONFIG_SOC_IMX50) += mm-mx50.o

    +obj-$(CONFIG_PM) += pm-imx51.o
    obj-$(CONFIG_CPU_FREQ_IMX) += cpu_op-mx51.o
    obj-$(CONFIG_MACH_MX51_BABBAGE) += board-mx51_babbage.o
    obj-$(CONFIG_MACH_MX51_3DS) += board-mx51_3ds.o
    diff --git a/arch/arm/mach-mx5/pm-imx51.c b/arch/arm/mach-mx5/pm-imx51.c
    new file mode 100644
    index 0000000..4a1d915
    --- /dev/null
    +++ b/arch/arm/mach-mx5/pm-imx51.c
    @@ -0,0 +1,69 @@
    +/*
    + * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
    + *
    + * 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/suspend.h>
    +#include <linux/clk.h>
    +#include <asm/mach/map.h>
    +#include <asm/cacheflush.h>
    +#include <asm/tlb.h>
    +#include <mach/system.h>
    +#include "crm_regs.h"
    +
    +struct clk *gpc_dvfs_clk;
    +
    +static int mx5_suspend_enter(suspend_state_t state)
    +{
    + if (gpc_dvfs_clk == NULL)
    + gpc_dvfs_clk = clk_get(NULL, "gpc_dvfs_clk");
    +
    + clk_enable(gpc_dvfs_clk);
    + switch (state) {
    + case PM_SUSPEND_MEM:
    + mx5_cpu_lp_set(STOP_POWER_OFF);
    + break;
    + case PM_SUSPEND_STANDBY:
    + mx5_cpu_lp_set(WAIT_UNCLOCKED_POWER_OFF);
    + break;
    + default:
    + return -EINVAL;
    + }
    +
    + if (state == PM_SUSPEND_MEM) {
    + local_flush_tlb_all();
    + flush_cache_all();
    +
    + /*clear the EMPGC0/1 bits */
    + __raw_writel(0, MXC_SRPG_EMPGC0_SRPGCR);
    + __raw_writel(0, MXC_SRPG_EMPGC1_SRPGCR);
    + }
    + cpu_do_idle();
    + clk_disable(gpc_dvfs_clk);
    +
    + return 0;
    +}
    +
    +static int mx5_pm_valid(suspend_state_t state)
    +{
    + return (state > PM_SUSPEND_ON && state <= PM_SUSPEND_MAX);
    +}
    +
    +static const struct platform_suspend_ops mx5_suspend_ops = {
    + .valid = mx5_pm_valid,
    + .enter = mx5_suspend_enter,
    +};
    +
    +static int __init mx5_pm_init(void)
    +{
    + if (cpu_is_mx51())
    + suspend_set_ops(&mx5_suspend_ops);
    +
    + return 0;
    +}
    +device_initcall(mx5_pm_init);
    --
    1.6.0.4



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