Merge branch 'pm-upstream/debug' of git://git.kernel.org/pub/scm/linux/kernel/git/khilman/linux-omap-pm into for-next

9 files changed, 607 insertions, 15 deletions

diff --git a/arch/arm/mach-omap2/clock.c b/arch/arm/mach-omap2/clock.c
index 456e2ad5f621..f2a92d614f0f 100644
--- a/arch/arm/mach-omap2/clock.c
+++ b/arch/arm/mach-omap2/clock.c
@@ -1043,5 +1043,7 @@ void omap2_clk_disable_unused(struct clk *clk)
                 omap2_clk_disable(clk);
         } else
                 _omap2_clk_disable(clk);
+        if (clk->clkdm != NULL)
+                pwrdm_clkdm_state_switch(clk->clkdm);
 }
 #endif
diff --git a/arch/arm/mach-omap2/clockdomain.c b/arch/arm/mach-omap2/clockdomain.c
index 0e7d501865b6..4ef7b4f5474e 100644
--- a/arch/arm/mach-omap2/clockdomain.c
+++ b/arch/arm/mach-omap2/clockdomain.c
@@ -299,7 +299,8 @@ struct clockdomain *clkdm_lookup(const char *name)
  * anything else to indicate failure; or -EINVAL if the function pointer
  * is null.
  */
-int clkdm_for_each(int (*fn)(struct clockdomain *clkdm))
+int clkdm_for_each(int (*fn)(struct clockdomain *clkdm, void *user),
+                        void *user)
 {
         struct clockdomain *clkdm;
         int ret = 0;
@@ -309,7 +310,7 @@ int clkdm_for_each(int (*fn)(struct clockdomain *clkdm))
 
         mutex_lock(&clkdm_mutex);
         list_for_each_entry(clkdm, &clkdm_list, node) {
-                ret = (*fn)(clkdm);
+                ret = (*fn)(clkdm, user);
                 if (ret)
                         break;
         }
@@ -484,6 +485,8 @@ void omap2_clkdm_allow_idle(struct clockdomain *clkdm)
                             v << __ffs(clkdm->clktrctrl_mask),
                             clkdm->pwrdm.ptr->prcm_offs,
                             CM_CLKSTCTRL);
+
+        pwrdm_clkdm_state_switch(clkdm);
 }
 
 /**
@@ -572,6 +575,7 @@ int omap2_clkdm_clk_enable(struct clockdomain *clkdm, struct clk *clk)
                 omap2_clkdm_wakeup(clkdm);
 
         pwrdm_wait_transition(clkdm->pwrdm.ptr);
+        pwrdm_clkdm_state_switch(clkdm);
 
         return 0;
 }
@@ -624,6 +628,8 @@ int omap2_clkdm_clk_disable(struct clockdomain *clkdm, struct clk *clk)
         else
                 omap2_clkdm_sleep(clkdm);
 
+        pwrdm_clkdm_state_switch(clkdm);
+
         return 0;
 }
 
diff --git a/arch/arm/mach-omap2/pm-debug.c b/arch/arm/mach-omap2/pm-debug.c
index da3a53f8ccc8..1b4c1600f8d8 100644
--- a/arch/arm/mach-omap2/pm-debug.c
+++ b/arch/arm/mach-omap2/pm-debug.c
@@ -20,13 +20,16 @@
  */
 
 #include <linux/kernel.h>
-#include <linux/timer.h>
+#include <linux/sched.h>
 #include <linux/clk.h>
 #include <linux/err.h>
 #include <linux/io.h>
+#include <linux/module.h>
 
 #include <mach/clock.h>
 #include <mach/board.h>
+#include <mach/powerdomain.h>
+#include <mach/clockdomain.h>
 
 #include "prm.h"
 #include "cm.h"
@@ -50,6 +53,8 @@ int omap2_pm_debug;
         regs[reg_count].name = #reg; \
         regs[reg_count++].val = __raw_readl(OMAP2_IO_ADDRESS(0x480fe000 + (off)))
 
+static int __init pm_dbg_init(void);
+
 void omap2_pm_dump(int mode, int resume, unsigned int us)
 {
         struct reg {
@@ -150,3 +155,425 @@ void omap2_pm_dump(int mode, int resume, unsigned int us)
         for (i = 0; i < reg_count; i++)
                 printk(KERN_INFO "%-20s: 0x%08x\n", regs[i].name, regs[i].val);
 }
+
+#ifdef CONFIG_DEBUG_FS
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+
+static void pm_dbg_regset_store(u32 *ptr);
+
+struct dentry *pm_dbg_dir;
+
+static int pm_dbg_init_done;
+
+enum {
+        DEBUG_FILE_COUNTERS = 0,
+        DEBUG_FILE_TIMERS,
+};
+
+struct pm_module_def {
+        char name[8]; /* Name of the module */
+        short type; /* CM or PRM */
+        unsigned short offset;
+        int low; /* First register address on this module */
+        int high; /* Last register address on this module */
+};
+
+#define MOD_CM 0
+#define MOD_PRM 1
+
+static const struct pm_module_def *pm_dbg_reg_modules;
+static const struct pm_module_def omap3_pm_reg_modules[] = {
+        { "IVA2", MOD_CM, OMAP3430_IVA2_MOD, 0, 0x4c },
+        { "OCP", MOD_CM, OCP_MOD, 0, 0x10 },
+        { "MPU", MOD_CM, MPU_MOD, 4, 0x4c },
+        { "CORE", MOD_CM, CORE_MOD, 0, 0x4c },
+        { "SGX", MOD_CM, OMAP3430ES2_SGX_MOD, 0, 0x4c },
+        { "WKUP", MOD_CM, WKUP_MOD, 0, 0x40 },
+        { "CCR", MOD_CM, PLL_MOD, 0, 0x70 },
+        { "DSS", MOD_CM, OMAP3430_DSS_MOD, 0, 0x4c },
+        { "CAM", MOD_CM, OMAP3430_CAM_MOD, 0, 0x4c },
+        { "PER", MOD_CM, OMAP3430_PER_MOD, 0, 0x4c },
+        { "EMU", MOD_CM, OMAP3430_EMU_MOD, 0x40, 0x54 },
+        { "NEON", MOD_CM, OMAP3430_NEON_MOD, 0x20, 0x48 },
+        { "USB", MOD_CM, OMAP3430ES2_USBHOST_MOD, 0, 0x4c },
+
+        { "IVA2", MOD_PRM, OMAP3430_IVA2_MOD, 0x50, 0xfc },
+        { "OCP", MOD_PRM, OCP_MOD, 4, 0x1c },
+        { "MPU", MOD_PRM, MPU_MOD, 0x58, 0xe8 },
+        { "CORE", MOD_PRM, CORE_MOD, 0x58, 0xf8 },
+        { "SGX", MOD_PRM, OMAP3430ES2_SGX_MOD, 0x58, 0xe8 },
+        { "WKUP", MOD_PRM, WKUP_MOD, 0xa0, 0xb0 },
+        { "CCR", MOD_PRM, PLL_MOD, 0x40, 0x70 },
+        { "DSS", MOD_PRM, OMAP3430_DSS_MOD, 0x58, 0xe8 },
+        { "CAM", MOD_PRM, OMAP3430_CAM_MOD, 0x58, 0xe8 },
+        { "PER", MOD_PRM, OMAP3430_PER_MOD, 0x58, 0xe8 },
+        { "EMU", MOD_PRM, OMAP3430_EMU_MOD, 0x58, 0xe4 },
+        { "GLBL", MOD_PRM, OMAP3430_GR_MOD, 0x20, 0xe4 },
+        { "NEON", MOD_PRM, OMAP3430_NEON_MOD, 0x58, 0xe8 },
+        { "USB", MOD_PRM, OMAP3430ES2_USBHOST_MOD, 0x58, 0xe8 },
+        { "", 0, 0, 0, 0 },
+};
+
+#define PM_DBG_MAX_REG_SETS 4
+
+static void *pm_dbg_reg_set[PM_DBG_MAX_REG_SETS];
+
+static int pm_dbg_get_regset_size(void)
+{
+        static int regset_size;
+
+        if (regset_size == 0) {
+                int i = 0;
+
+                while (pm_dbg_reg_modules[i].name[0] != 0) {
+                        regset_size += pm_dbg_reg_modules[i].high +
+                                4 - pm_dbg_reg_modules[i].low;
+                        i++;
+                }
+        }
+        return regset_size;
+}
+
+static int pm_dbg_show_regs(struct seq_file *s, void *unused)
+{
+        int i, j;
+        unsigned long val;
+        int reg_set = (int)s->private;
+        u32 *ptr;
+        void *store = NULL;
+        int regs;
+        int linefeed;
+
+        if (reg_set == 0) {
+                store = kmalloc(pm_dbg_get_regset_size(), GFP_KERNEL);
+                ptr = store;
+                pm_dbg_regset_store(ptr);
+        } else {
+                ptr = pm_dbg_reg_set[reg_set - 1];
+        }
+
+        i = 0;
+
+        while (pm_dbg_reg_modules[i].name[0] != 0) {
+                regs = 0;
+                linefeed = 0;
+                if (pm_dbg_reg_modules[i].type == MOD_CM)
+                        seq_printf(s, "MOD: CM_%s (%08x)\n",
+                                pm_dbg_reg_modules[i].name,
+                                (u32)(OMAP3430_CM_BASE +
+                                pm_dbg_reg_modules[i].offset));
+                else
+                        seq_printf(s, "MOD: PRM_%s (%08x)\n",
+                                pm_dbg_reg_modules[i].name,
+                                (u32)(OMAP3430_PRM_BASE +
+                                pm_dbg_reg_modules[i].offset));
+
+                for (j = pm_dbg_reg_modules[i].low;
+                        j <= pm_dbg_reg_modules[i].high; j += 4) {
+                        val = *(ptr++);
+                        if (val != 0) {
+                                regs++;
+                                if (linefeed) {
+                                        seq_printf(s, "\n");
+                                        linefeed = 0;
+                                }
+                                seq_printf(s, "  %02x => %08lx", j, val);
+                                if (regs % 4 == 0)
+                                        linefeed = 1;
+                        }
+                }
+                seq_printf(s, "\n");
+                i++;
+        }
+
+        if (store != NULL)
+                kfree(store);
+
+        return 0;
+}
+
+static void pm_dbg_regset_store(u32 *ptr)
+{
+        int i, j;
+        u32 val;
+
+        i = 0;
+
+        while (pm_dbg_reg_modules[i].name[0] != 0) {
+                for (j = pm_dbg_reg_modules[i].low;
+                        j <= pm_dbg_reg_modules[i].high; j += 4) {
+                        if (pm_dbg_reg_modules[i].type == MOD_CM)
+                                val = cm_read_mod_reg(
+                                        pm_dbg_reg_modules[i].offset, j);
+                        else
+                                val = prm_read_mod_reg(
+                                        pm_dbg_reg_modules[i].offset, j);
+                        *(ptr++) = val;
+                }
+                i++;
+        }
+}
+
+int pm_dbg_regset_save(int reg_set)
+{
+        if (pm_dbg_reg_set[reg_set-1] == NULL)
+                return -EINVAL;
+
+        pm_dbg_regset_store(pm_dbg_reg_set[reg_set-1]);
+
+        return 0;
+}
+
+static const char pwrdm_state_names[][4] = {
+        "OFF",
+        "RET",
+        "INA",
+        "ON"
+};
+
+void pm_dbg_update_time(struct powerdomain *pwrdm, int prev)
+{
+        s64 t;
+
+        if (!pm_dbg_init_done)
+                return ;
+
+        /* Update timer for previous state */
+        t = sched_clock();
+
+        pwrdm->state_timer[prev] += t - pwrdm->timer;
+
+        pwrdm->timer = t;
+}
+
+static int clkdm_dbg_show_counter(struct clockdomain *clkdm, void *user)
+{
+        struct seq_file *s = (struct seq_file *)user;
+
+        if (strcmp(clkdm->name, "emu_clkdm") == 0 ||
+                strcmp(clkdm->name, "wkup_clkdm") == 0 ||
+                strncmp(clkdm->name, "dpll", 4) == 0)
+                return 0;
+
+        seq_printf(s, "%s->%s (%d)", clkdm->name,
+                        clkdm->pwrdm.ptr->name,
+                        atomic_read(&clkdm->usecount));
+        seq_printf(s, "\n");
+
+        return 0;
+}
+
+static int pwrdm_dbg_show_counter(struct powerdomain *pwrdm, void *user)
+{
+        struct seq_file *s = (struct seq_file *)user;
+        int i;
+
+        if (strcmp(pwrdm->name, "emu_pwrdm") == 0 ||
+                strcmp(pwrdm->name, "wkup_pwrdm") == 0 ||
+                strncmp(pwrdm->name, "dpll", 4) == 0)
+                return 0;
+
+        if (pwrdm->state != pwrdm_read_pwrst(pwrdm))
+                printk(KERN_ERR "pwrdm state mismatch(%s) %d != %d\n",
+                        pwrdm->name, pwrdm->state, pwrdm_read_pwrst(pwrdm));
+
+        seq_printf(s, "%s (%s)", pwrdm->name,
+                        pwrdm_state_names[pwrdm->state]);
+        for (i = 0; i < 4; i++)
+                seq_printf(s, ",%s:%d", pwrdm_state_names[i],
+                        pwrdm->state_counter[i]);
+
+        seq_printf(s, "\n");
+
+        return 0;
+}
+
+static int pwrdm_dbg_show_timer(struct powerdomain *pwrdm, void *user)
+{
+        struct seq_file *s = (struct seq_file *)user;
+        int i;
+
+        if (strcmp(pwrdm->name, "emu_pwrdm") == 0 ||
+                strcmp(pwrdm->name, "wkup_pwrdm") == 0 ||
+                strncmp(pwrdm->name, "dpll", 4) == 0)
+                return 0;
+
+        pwrdm_state_switch(pwrdm);
+
+        seq_printf(s, "%s (%s)", pwrdm->name,
+                pwrdm_state_names[pwrdm->state]);
+
+        for (i = 0; i < 4; i++)
+                seq_printf(s, ",%s:%lld", pwrdm_state_names[i],
+                        pwrdm->state_timer[i]);
+
+        seq_printf(s, "\n");
+        return 0;
+}
+
+static int pm_dbg_show_counters(struct seq_file *s, void *unused)
+{
+        pwrdm_for_each(pwrdm_dbg_show_counter, s);
+        clkdm_for_each(clkdm_dbg_show_counter, s);
+
+        return 0;
+}
+
+static int pm_dbg_show_timers(struct seq_file *s, void *unused)
+{
+        pwrdm_for_each(pwrdm_dbg_show_timer, s);
+        return 0;
+}
+
+static int pm_dbg_open(struct inode *inode, struct file *file)
+{
+        switch ((int)inode->i_private) {
+        case DEBUG_FILE_COUNTERS:
+                return single_open(file, pm_dbg_show_counters,
+                        &inode->i_private);
+        case DEBUG_FILE_TIMERS:
+        default:
+                return single_open(file, pm_dbg_show_timers,
+                        &inode->i_private);
+        };
+}
+
+static int pm_dbg_reg_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, pm_dbg_show_regs, inode->i_private);
+}
+
+static const struct file_operations debug_fops = {
+        .open           = pm_dbg_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+static const struct file_operations debug_reg_fops = {
+        .open           = pm_dbg_reg_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+int pm_dbg_regset_init(int reg_set)
+{
+        char name[2];
+
+        if (!pm_dbg_init_done)
+                pm_dbg_init();
+
+        if (reg_set < 1 || reg_set > PM_DBG_MAX_REG_SETS ||
+                pm_dbg_reg_set[reg_set-1] != NULL)
+                return -EINVAL;
+
+        pm_dbg_reg_set[reg_set-1] =
+                kmalloc(pm_dbg_get_regset_size(), GFP_KERNEL);
+
+        if (pm_dbg_reg_set[reg_set-1] == NULL)
+                return -ENOMEM;
+
+        if (pm_dbg_dir != NULL) {
+                sprintf(name, "%d", reg_set);
+
+                (void) debugfs_create_file(name, S_IRUGO,
+                        pm_dbg_dir, (void *)reg_set, &debug_reg_fops);
+        }
+
+        return 0;
+}
+
+static int pwrdm_suspend_get(void *data, u64 *val)
+{
+        *val = omap3_pm_get_suspend_state((struct powerdomain *)data);
+
+        if (*val >= 0)
+                return 0;
+        return *val;
+}
+
+static int pwrdm_suspend_set(void *data, u64 val)
+{
+        return omap3_pm_set_suspend_state((struct powerdomain *)data, (int)val);
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(pwrdm_suspend_fops, pwrdm_suspend_get,
+                        pwrdm_suspend_set, "%llu\n");
+
+static int __init pwrdms_setup(struct powerdomain *pwrdm, void *dir)
+{
+        int i;
+        s64 t;
+        struct dentry *d;
+
+        t = sched_clock();
+
+        for (i = 0; i < 4; i++)
+                pwrdm->state_timer[i] = 0;
+
+        pwrdm->timer = t;
+
+        if (strncmp(pwrdm->name, "dpll", 4) == 0)
+                return 0;
+
+        d = debugfs_create_dir(pwrdm->name, (struct dentry *)dir);
+
+        (void) debugfs_create_file("suspend", S_IRUGO|S_IWUSR, d,
+                        (void *)pwrdm, &pwrdm_suspend_fops);
+
+        return 0;
+}
+
+static int __init pm_dbg_init(void)
+{
+        int i;
+        struct dentry *d;
+        char name[2];
+
+        if (pm_dbg_init_done)
+                return 0;
+
+        if (cpu_is_omap34xx())
+                pm_dbg_reg_modules = omap3_pm_reg_modules;
+        else {
+                printk(KERN_ERR "%s: only OMAP3 supported\n", __func__);
+                return -ENODEV;
+        }
+                
+        d = debugfs_create_dir("pm_debug", NULL);
+        if (IS_ERR(d))
+                return PTR_ERR(d);
+
+        (void) debugfs_create_file("count", S_IRUGO,
+                d, (void *)DEBUG_FILE_COUNTERS, &debug_fops);
+        (void) debugfs_create_file("time", S_IRUGO,
+                d, (void *)DEBUG_FILE_TIMERS, &debug_fops);
+
+        pwrdm_for_each(pwrdms_setup, (void *)d);
+
+        pm_dbg_dir = debugfs_create_dir("registers", d);
+        if (IS_ERR(pm_dbg_dir))
+                return PTR_ERR(pm_dbg_dir);
+
+        (void) debugfs_create_file("current", S_IRUGO,
+                pm_dbg_dir, (void *)0, &debug_reg_fops);
+
+        for (i = 0; i < PM_DBG_MAX_REG_SETS; i++)
+                if (pm_dbg_reg_set[i] != NULL) {
+                        sprintf(name, "%d", i+1);
+                        (void) debugfs_create_file(name, S_IRUGO,
+                                pm_dbg_dir, (void *)(i+1), &debug_reg_fops);
+
+                }
+
+        pm_dbg_init_done = 1;
+
+        return 0;
+}
+arch_initcall(pm_dbg_init);
+
+#else
+void pm_dbg_update_time(struct powerdomain *pwrdm, int prev) {}
+#endif
diff --git a/arch/arm/mach-omap2/pm.h b/arch/arm/mach-omap2/pm.h
index 21201cd4117b..8400f5768923 100644
--- a/arch/arm/mach-omap2/pm.h
+++ b/arch/arm/mach-omap2/pm.h
@@ -11,12 +11,23 @@
 #ifndef __ARCH_ARM_MACH_OMAP2_PM_H
 #define __ARCH_ARM_MACH_OMAP2_PM_H
 
+#include <mach/powerdomain.h>
+
+extern int omap3_pm_get_suspend_state(struct powerdomain *pwrdm);
+extern int omap3_pm_set_suspend_state(struct powerdomain *pwrdm, int state);
+
 #ifdef CONFIG_PM_DEBUG
 extern void omap2_pm_dump(int mode, int resume, unsigned int us);
 extern int omap2_pm_debug;
+extern void pm_dbg_update_time(struct powerdomain *pwrdm, int prev);
+extern int pm_dbg_regset_save(int reg_set);
+extern int pm_dbg_regset_init(int reg_set);
 #else
 #define omap2_pm_dump(mode, resume, us)         do {} while (0);
 #define omap2_pm_debug                          0
+#define pm_dbg_update_time(pwrdm, prev) do {} while (0);
+#define pm_dbg_regset_save(reg_set) do {} while (0);
+#define pm_dbg_regset_init(reg_set) do {} while (0);
 #endif /* CONFIG_PM_DEBUG */
 
 extern void omap24xx_idle_loop_suspend(void);
diff --git a/arch/arm/mach-omap2/pm24xx.c b/arch/arm/mach-omap2/pm24xx.c
index 528dbdc26e23..bff5c4e89742 100644
--- a/arch/arm/mach-omap2/pm24xx.c
+++ b/arch/arm/mach-omap2/pm24xx.c
@@ -333,7 +333,7 @@ static struct platform_suspend_ops omap_pm_ops = {
         .valid          = suspend_valid_only_mem,
 };
 
-static int _pm_clkdm_enable_hwsup(struct clockdomain *clkdm)
+static int _pm_clkdm_enable_hwsup(struct clockdomain *clkdm, void *unused)
 {
         omap2_clkdm_allow_idle(clkdm);
         return 0;
@@ -385,7 +385,7 @@ static void __init prcm_setup_regs(void)
         omap2_clkdm_sleep(gfx_clkdm);
 
         /* Enable clockdomain hardware-supervised control for all clkdms */
-        clkdm_for_each(_pm_clkdm_enable_hwsup);
+        clkdm_for_each(_pm_clkdm_enable_hwsup, NULL);
 
         /* Enable clock autoidle for all domains */
         cm_write_mod_reg(OMAP24XX_AUTO_CAM |
diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c
index d67b781045b7..0ff5a6c53aa0 100644
--- a/arch/arm/mach-omap2/pm34xx.c
+++ b/arch/arm/mach-omap2/pm34xx.c
@@ -170,6 +170,8 @@ static void omap_sram_idle(void)
                 printk(KERN_ERR "Invalid mpu state in sram_idle\n");
                 return;
         }
+        pwrdm_pre_transition();
+
         omap2_gpio_prepare_for_retention();
         omap_uart_prepare_idle(0);
         omap_uart_prepare_idle(1);
@@ -182,6 +184,9 @@ static void omap_sram_idle(void)
         omap_uart_resume_idle(1);
         omap_uart_resume_idle(0);
         omap2_gpio_resume_after_retention();
+
+        pwrdm_post_transition();
+
 }
 
 /*
@@ -271,6 +276,7 @@ static int set_pwrdm_state(struct powerdomain *pwrdm, u32 state)
         if (sleep_switch) {
                 omap2_clkdm_allow_idle(pwrdm->pwrdm_clkdms[0]);
                 pwrdm_wait_transition(pwrdm);
+                pwrdm_state_switch(pwrdm);
         }
 
 err:
@@ -658,7 +664,31 @@ static void __init prcm_setup_regs(void)
         omap3_d2d_idle();
 }
 
-static int __init pwrdms_setup(struct powerdomain *pwrdm)
+int omap3_pm_get_suspend_state(struct powerdomain *pwrdm)
+{
+        struct power_state *pwrst;
+
+        list_for_each_entry(pwrst, &pwrst_list, node) {
+                if (pwrst->pwrdm == pwrdm)
+                        return pwrst->next_state;
+        }
+        return -EINVAL;
+}
+
+int omap3_pm_set_suspend_state(struct powerdomain *pwrdm, int state)
+{
+        struct power_state *pwrst;
+
+        list_for_each_entry(pwrst, &pwrst_list, node) {
+                if (pwrst->pwrdm == pwrdm) {
+                        pwrst->next_state = state;
+                        return 0;
+                }
+        }
+        return -EINVAL;
+}
+
+static int __init pwrdms_setup(struct powerdomain *pwrdm, void *unused)
 {
         struct power_state *pwrst;
 
@@ -683,7 +713,7 @@ static int __init pwrdms_setup(struct powerdomain *pwrdm)
  * supported. Initiate sleep transition for other clockdomains, if
  * they are not used
  */
-static int __init clkdms_setup(struct clockdomain *clkdm)
+static int __init clkdms_setup(struct clockdomain *clkdm, void *unused)
 {
         if (clkdm->flags & CLKDM_CAN_ENABLE_AUTO)
                 omap2_clkdm_allow_idle(clkdm);
@@ -716,13 +746,13 @@ static int __init omap3_pm_init(void)
                 goto err1;
         }
 
-        ret = pwrdm_for_each(pwrdms_setup);
+        ret = pwrdm_for_each(pwrdms_setup, NULL);
         if (ret) {
                 printk(KERN_ERR "Failed to setup powerdomains\n");
                 goto err2;
         }
 
-        (void) clkdm_for_each(clkdms_setup);
+        (void) clkdm_for_each(clkdms_setup, NULL);
 
         mpu_pwrdm = pwrdm_lookup("mpu_pwrdm");
         if (mpu_pwrdm == NULL) {
diff --git a/arch/arm/mach-omap2/powerdomain.c b/arch/arm/mach-omap2/powerdomain.c
index 983f1cb676be..5a6cef3e42bf 100644
--- a/arch/arm/mach-omap2/powerdomain.c
+++ b/arch/arm/mach-omap2/powerdomain.c
@@ -35,6 +35,13 @@
 #include <mach/powerdomain.h>
 #include <mach/clockdomain.h>
 
+#include "pm.h"
+
+enum {
+        PWRDM_STATE_NOW = 0,
+        PWRDM_STATE_PREV,
+};
+
 /* pwrdm_list contains all registered struct powerdomains */
 static LIST_HEAD(pwrdm_list);
 
@@ -102,6 +109,65 @@ static struct powerdomain *_pwrdm_deps_lookup(struct powerdomain *pwrdm,
         return pd->pwrdm;
 }
 
+static int _pwrdm_state_switch(struct powerdomain *pwrdm, int flag)
+{
+
+        int prev;
+        int state;
+
+        if (pwrdm == NULL)
+                return -EINVAL;
+
+        state = pwrdm_read_pwrst(pwrdm);
+
+        switch (flag) {
+        case PWRDM_STATE_NOW:
+                prev = pwrdm->state;
+                break;
+        case PWRDM_STATE_PREV:
+                prev = pwrdm_read_prev_pwrst(pwrdm);
+                if (pwrdm->state != prev)
+                        pwrdm->state_counter[prev]++;
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        if (state != prev)
+                pwrdm->state_counter[state]++;
+
+        pm_dbg_update_time(pwrdm, prev);
+
+        pwrdm->state = state;
+
+        return 0;
+}
+
+static int _pwrdm_pre_transition_cb(struct powerdomain *pwrdm, void *unused)
+{
+        pwrdm_clear_all_prev_pwrst(pwrdm);
+        _pwrdm_state_switch(pwrdm, PWRDM_STATE_NOW);
+        return 0;
+}
+
+static int _pwrdm_post_transition_cb(struct powerdomain *pwrdm, void *unused)
+{
+        _pwrdm_state_switch(pwrdm, PWRDM_STATE_PREV);
+        return 0;
+}
+
+static __init void _pwrdm_setup(struct powerdomain *pwrdm)
+{
+        int i;
+
+        for (i = 0; i < 4; i++)
+                pwrdm->state_counter[i] = 0;
+
+        pwrdm_wait_transition(pwrdm);
+        pwrdm->state = pwrdm_read_pwrst(pwrdm);
+        pwrdm->state_counter[pwrdm->state] = 1;
+
+}
 
 /* Public functions */
 
@@ -117,9 +183,12 @@ void pwrdm_init(struct powerdomain **pwrdm_list)
 {
         struct powerdomain **p = NULL;
 
-        if (pwrdm_list)
-                for (p = pwrdm_list; *p; p++)
+        if (pwrdm_list) {
+                for (p = pwrdm_list; *p; p++) {
                         pwrdm_register(*p);
+                        _pwrdm_setup(*p);
+                }
+        }
 }
 
 /**
@@ -217,7 +286,8 @@ struct powerdomain *pwrdm_lookup(const char *name)
  * anything else to indicate failure; or -EINVAL if the function
  * pointer is null.
  */
-int pwrdm_for_each(int (*fn)(struct powerdomain *pwrdm))
+int pwrdm_for_each(int (*fn)(struct powerdomain *pwrdm, void *user),
+                        void *user)
 {
         struct powerdomain *temp_pwrdm;
         unsigned long flags;
@@ -228,7 +298,7 @@ int pwrdm_for_each(int (*fn)(struct powerdomain *pwrdm))
 
         read_lock_irqsave(&pwrdm_rwlock, flags);
         list_for_each_entry(temp_pwrdm, &pwrdm_list, node) {
-                ret = (*fn)(temp_pwrdm);
+                ret = (*fn)(temp_pwrdm, user);
                 if (ret)
                         break;
         }
@@ -1110,4 +1180,36 @@ int pwrdm_wait_transition(struct powerdomain *pwrdm)
         return 0;
 }
 
+int pwrdm_state_switch(struct powerdomain *pwrdm)
+{
+        return _pwrdm_state_switch(pwrdm, PWRDM_STATE_NOW);
+}
+
+int pwrdm_clkdm_state_switch(struct clockdomain *clkdm)
+{
+        if (clkdm != NULL && clkdm->pwrdm.ptr != NULL) {
+                pwrdm_wait_transition(clkdm->pwrdm.ptr);
+                return pwrdm_state_switch(clkdm->pwrdm.ptr);
+        }
+
+        return -EINVAL;
+}
+int pwrdm_clk_state_switch(struct clk *clk)
+{
+        if (clk != NULL && clk->clkdm != NULL)
+                return pwrdm_clkdm_state_switch(clk->clkdm);
+        return -EINVAL;
+}
+
+int pwrdm_pre_transition(void)
+{
+        pwrdm_for_each(_pwrdm_pre_transition_cb, NULL);
+        return 0;
+}
+
+int pwrdm_post_transition(void)
+{
+        pwrdm_for_each(_pwrdm_post_transition_cb, NULL);
+        return 0;
+}
 
diff --git a/arch/arm/plat-omap/include/mach/clockdomain.h b/arch/arm/plat-omap/include/mach/clockdomain.h
index b9d0dd2da89b..99ebd886f134 100644
--- a/arch/arm/plat-omap/include/mach/clockdomain.h
+++ b/arch/arm/plat-omap/include/mach/clockdomain.h
@@ -95,7 +95,8 @@ int clkdm_register(struct clockdomain *clkdm);
 int clkdm_unregister(struct clockdomain *clkdm);
 struct clockdomain *clkdm_lookup(const char *name);
 
-int clkdm_for_each(int (*fn)(struct clockdomain *clkdm));
+int clkdm_for_each(int (*fn)(struct clockdomain *clkdm, void *user),
+                        void *user);
 struct powerdomain *clkdm_get_pwrdm(struct clockdomain *clkdm);
 
 void omap2_clkdm_allow_idle(struct clockdomain *clkdm);
diff --git a/arch/arm/plat-omap/include/mach/powerdomain.h b/arch/arm/plat-omap/include/mach/powerdomain.h
index 69c9e675d8ee..6271d8556a40 100644
--- a/arch/arm/plat-omap/include/mach/powerdomain.h
+++ b/arch/arm/plat-omap/include/mach/powerdomain.h
@@ -117,6 +117,13 @@ struct powerdomain {
 
         struct list_head node;
 
+        int state;
+        unsigned state_counter[4];
+
+#ifdef CONFIG_PM_DEBUG
+        s64 timer;
+        s64 state_timer[4];
+#endif
 };
 
 
@@ -126,7 +133,8 @@ int pwrdm_register(struct powerdomain *pwrdm);
 int pwrdm_unregister(struct powerdomain *pwrdm);
 struct powerdomain *pwrdm_lookup(const char *name);
 
-int pwrdm_for_each(int (*fn)(struct powerdomain *pwrdm));
+int pwrdm_for_each(int (*fn)(struct powerdomain *pwrdm, void *user),
+                        void *user);
 
 int pwrdm_add_clkdm(struct powerdomain *pwrdm, struct clockdomain *clkdm);
 int pwrdm_del_clkdm(struct powerdomain *pwrdm, struct clockdomain *clkdm);
@@ -164,4 +172,9 @@ bool pwrdm_has_hdwr_sar(struct powerdomain *pwrdm);
 
 int pwrdm_wait_transition(struct powerdomain *pwrdm);
 
+int pwrdm_state_switch(struct powerdomain *pwrdm);
+int pwrdm_clkdm_state_switch(struct clockdomain *clkdm);
+int pwrdm_pre_transition(void);
+int pwrdm_post_transition(void);
+
 #endif