ARM: OMAP2+: pm33xx: Add support for rtc+ddr in self refresh mode

Add support for rtc+ddr in self refresh mode. Add addtional
pm hooks for save/restore and rtc suspend/resume.

Signed-off-by: Keerthy <j-keerthy@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

diff --git a/arch/arm/mach-omap2/pm33xx-core.c b/arch/arm/mach-omap2/pm33xx-core.c
index 724cf57..f81cc45 100644 (file)
--- a/arch/arm/mach-omap2/pm33xx-core.c
+++ b/arch/arm/mach-omap2/pm33xx-core.c
@@ -10,6 +10,12 @@
 #include <asm/suspend.h>
 #include <linux/errno.h>
 #include <linux/platform_data/pm33xx.h>
+#include <linux/clk.h>
+#include <linux/platform_data/gpio-omap.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/wkup_m3_ipc.h>
+#include <linux/of.h>
+#include <linux/rtc.h>
 
 #include "cm33xx.h"
 #include "common.h"
@@ -38,6 +44,29 @@ static int am43xx_map_scu(void)
        return 0;
 }
 
+static int am33xx_check_off_mode_enable(void)
+{
+       if (enable_off_mode)
+               pr_warn("WARNING: This platform does not support off-mode, entering DeepSleep suspend.\n");
+
+       /* off mode not supported on am335x so return 0 always */
+       return 0;
+}
+
+static int am43xx_check_off_mode_enable(void)
+{
+       /*
+        * Check for am437x-gp-evm which has the right Hardware design to
+        * support this mode reliably.
+        */
+       if (of_machine_is_compatible("ti,am437x-gp-evm") && enable_off_mode)
+               return enable_off_mode;
+       else if (enable_off_mode)
+               pr_warn("WARNING: This platform does not support off-mode, entering DeepSleep suspend.\n");
+
+       return 0;
+}
+
 static int amx3_common_init(void)
 {
        gfx_pwrdm = pwrdm_lookup("gfx_pwrdm");
@@ -139,7 +168,9 @@ static int am43xx_suspend(unsigned int state, int (*fn)(unsigned long),
        scu_power_mode(scu_base, SCU_PM_POWEROFF);
        ret = cpu_suspend(args, fn);
        scu_power_mode(scu_base, SCU_PM_NORMAL);
-       amx3_post_suspend_common();
+
+       if (!am43xx_check_off_mode_enable())
+               amx3_post_suspend_common();
 
        return ret;
 }
@@ -161,10 +192,48 @@ void __iomem *am43xx_get_rtc_base_addr(void)
        return omap_hwmod_get_mpu_rt_va(rtc_oh);
 }
 
+static void am43xx_save_context(void)
+{
+}
+
+static void am33xx_save_context(void)
+{
+       omap_intc_save_context();
+}
+
+static void am33xx_restore_context(void)
+{
+       omap_intc_restore_context();
+}
+
+static void am43xx_restore_context(void)
+{
+       /*
+        * HACK: restore dpll_per_clkdcoldo register contents, to avoid
+        * breaking suspend-resume
+        */
+       writel_relaxed(0x0, AM33XX_L4_WK_IO_ADDRESS(0x44df2e14));
+}
+
+static void am43xx_prepare_rtc_suspend(void)
+{
+       omap_hwmod_enable(rtc_oh);
+}
+
+static void am43xx_prepare_rtc_resume(void)
+{
+       omap_hwmod_idle(rtc_oh);
+}
+
 static struct am33xx_pm_platform_data am33xx_ops = {
        .init = am33xx_suspend_init,
        .soc_suspend = am33xx_suspend,
        .get_sram_addrs = amx3_get_sram_addrs,
+       .save_context = am33xx_save_context,
+       .restore_context = am33xx_restore_context,
+       .prepare_rtc_suspend = am43xx_prepare_rtc_suspend,
+       .prepare_rtc_resume = am43xx_prepare_rtc_resume,
+       .check_off_mode_enable = am33xx_check_off_mode_enable,
        .get_rtc_base_addr = am43xx_get_rtc_base_addr,
 };
 
@@ -172,6 +241,11 @@ static struct am33xx_pm_platform_data am43xx_ops = {
        .init = am43xx_suspend_init,
        .soc_suspend = am43xx_suspend,
        .get_sram_addrs = amx3_get_sram_addrs,
+       .save_context = am43xx_save_context,
+       .restore_context = am43xx_restore_context,
+       .prepare_rtc_suspend = am43xx_prepare_rtc_suspend,
+       .prepare_rtc_resume = am43xx_prepare_rtc_resume,
+       .check_off_mode_enable = am43xx_check_off_mode_enable,
        .get_rtc_base_addr = am43xx_get_rtc_base_addr,
 };
 

diff --git a/include/linux/platform_data/pm33xx.h b/include/linux/platform_data/pm33xx.h
index fbf5ed7..dd59719 100644 (file)
--- a/include/linux/platform_data/pm33xx.h
+++ b/include/linux/platform_data/pm33xx.h
@@ -51,6 +51,11 @@ struct am33xx_pm_platform_data {
                               unsigned long args);
        struct  am33xx_pm_sram_addr *(*get_sram_addrs)(void);
        void __iomem *(*get_rtc_base_addr)(void);
+       void (*save_context)(void);
+       void (*restore_context)(void);
+       void (*prepare_rtc_suspend)(void);
+       void (*prepare_rtc_resume)(void);
+       int (*check_off_mode_enable)(void);
 };
 
 struct am33xx_pm_sram_data {