OMAP3: PM debug: allow runtime toggle of PM features

Allow enable/disable of low-power states during idle.  To
enable low-power idle:

   echo 1 > /debug/pm_debug/sleep_while_idle

 to disable:

   echo 0 > /debug/pm_debug/sleep_while_idle

Also allow enable/disable of OFF-mode.  To enable:

   echo 1 > /debug/pm_debug/enable_off_mode

 to disable:

   echo 0 > /debug/pm_debug/enable_off_mode

Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

4 files changed, 53 insertions, 2 deletions

diff --git a/arch/arm/mach-omap2/pm-debug.c b/arch/arm/mach-omap2/pm-debug.c
index 7eb2c12c8b7c..1725da3f4e18 100644
--- a/arch/arm/mach-omap2/pm-debug.c
+++ b/arch/arm/mach-omap2/pm-debug.c
@@ -527,6 +527,29 @@ static int __init pwrdms_setup(struct powerdomain *pwrdm, void *dir)
         return 0;
 }
 
+static int option_get(void *data, u64 *val)
+{
+        u32 *option = data;
+
+        *val = *option;
+
+        return 0;
+}
+
+static int option_set(void *data, u64 val)
+{
+        u32 *option = data;
+
+        *option = val;
+
+        if (option == &enable_off_mode)
+                omap3_pm_off_mode_enable(val);
+
+        return 0;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(pm_dbg_option_fops, option_get, option_set, "%llu\n");
+
 static int __init pm_dbg_init(void)
 {
         int i;
@@ -569,6 +592,10 @@ static int __init pm_dbg_init(void)
 
                 }
 
+        (void) debugfs_create_file("enable_off_mode", S_IRUGO | S_IWUGO, d,
+                                   &enable_off_mode, &pm_dbg_option_fops);
+        (void) debugfs_create_file("sleep_while_idle", S_IRUGO | S_IWUGO, d,
+                                   &sleep_while_idle, &pm_dbg_option_fops);
         pm_dbg_init_done = 1;
 
         return 0;
diff --git a/arch/arm/mach-omap2/pm.h b/arch/arm/mach-omap2/pm.h
index 45cafac716d1..9582793ce82d 100644
--- a/arch/arm/mach-omap2/pm.h
+++ b/arch/arm/mach-omap2/pm.h
@@ -13,7 +13,11 @@
 
 #include <plat/powerdomain.h>
 
+extern u32 enable_off_mode;
+extern u32 sleep_while_idle;
+
 extern void *omap3_secure_ram_storage;
+extern void omap3_pm_off_mode_enable(int);
 
 extern int omap3_pm_get_suspend_state(struct powerdomain *pwrdm);
 extern int omap3_pm_set_suspend_state(struct powerdomain *pwrdm, int state);
diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c
index 90d1dc5884ef..ade2e4a6bb7d 100644
--- a/arch/arm/mach-omap2/pm34xx.c
+++ b/arch/arm/mach-omap2/pm34xx.c
@@ -25,6 +25,7 @@
 #include <linux/list.h>
 #include <linux/err.h>
 #include <linux/gpio.h>
+#include <linux/clk.h>
 
 #include <plat/sram.h>
 #include <plat/clockdomain.h>
@@ -57,6 +58,9 @@
 #define OMAP343X_TABLE_VALUE_OFFSET        0x30
 #define OMAP343X_CONTROL_REG_VALUE_OFFSET  0x32
 
+u32 enable_off_mode;
+u32 sleep_while_idle;
+
 struct power_state {
         struct powerdomain *pwrdm;
         u32 next_state;
@@ -456,6 +460,8 @@ static int omap3_fclks_active(void)
 
 static int omap3_can_sleep(void)
 {
+        if (!sleep_while_idle)
+                return 0;
         if (!omap_uart_can_sleep())
                 return 0;
         if (omap3_fclks_active())
@@ -900,6 +906,22 @@ static void __init prcm_setup_regs(void)
         omap3_d2d_idle();
 }
 
+void omap3_pm_off_mode_enable(int enable)
+{
+        struct power_state *pwrst;
+        u32 state;
+
+        if (enable)
+                state = PWRDM_POWER_OFF;
+        else
+                state = PWRDM_POWER_RET;
+
+        list_for_each_entry(pwrst, &pwrst_list, node) {
+                pwrst->next_state = state;
+                set_pwrdm_state(pwrst->pwrdm, state);
+        }
+}
+
 int omap3_pm_get_suspend_state(struct powerdomain *pwrdm)
 {
         struct power_state *pwrst;
diff --git a/arch/arm/mach-omap2/serial.c b/arch/arm/mach-omap2/serial.c
index a5aecffe03ff..72df1b188135 100644
--- a/arch/arm/mach-omap2/serial.c
+++ b/arch/arm/mach-omap2/serial.c
@@ -155,8 +155,6 @@ static inline void __init omap_uart_reset(struct omap_uart_state *uart)
 
 #if defined(CONFIG_PM) && defined(CONFIG_ARCH_OMAP3)
 
-static int enable_off_mode; /* to be removed by full off-mode patches */
-
 static void omap_uart_save_context(struct omap_uart_state *uart)
 {
         u16 lcr = 0;