8 files changed, 428 insertions, 10 deletions

diff --git a/arch/sh/kernel/cpu/sh4a/clock-sh7722.c b/arch/sh/kernel/cpu/sh4a/clock-sh7722.c
index 5b1bbbe63b1b..ea38b554dc05 100644
--- a/arch/sh/kernel/cpu/sh4a/clock-sh7722.c
+++ b/arch/sh/kernel/cpu/sh4a/clock-sh7722.c
@@ -164,11 +164,11 @@ static struct clk mstp_clks[] = {
         SH_HWBLK_CLK("2dg0", -1, B_CLK, HWBLK_2DG, 0),
         SH_HWBLK_CLK("siu0", -1, B_CLK, HWBLK_SIU, 0),
         SH_HWBLK_CLK("vou0", -1, B_CLK, HWBLK_VOU, 0),
-        SH_HWBLK_CLK("jpu0", -1, B_CLK, HWBLK_JPU, CLK_ENABLE_ON_INIT),
+        SH_HWBLK_CLK("jpu0", -1, B_CLK, HWBLK_JPU, 0),
         SH_HWBLK_CLK("beu0", -1, B_CLK, HWBLK_BEU, 0),
         SH_HWBLK_CLK("ceu0", -1, B_CLK, HWBLK_CEU, 0),
-        SH_HWBLK_CLK("veu0", -1, B_CLK, HWBLK_VEU, CLK_ENABLE_ON_INIT),
-        SH_HWBLK_CLK("vpu0", -1, B_CLK, HWBLK_VPU, CLK_ENABLE_ON_INIT),
+        SH_HWBLK_CLK("veu0", -1, B_CLK, HWBLK_VEU, 0),
+        SH_HWBLK_CLK("vpu0", -1, B_CLK, HWBLK_VPU, 0),
         SH_HWBLK_CLK("lcdc0", -1, P_CLK, HWBLK_LCDC, 0),
 };
 
diff --git a/arch/sh/kernel/cpu/sh4a/clock-sh7723.c b/arch/sh/kernel/cpu/sh4a/clock-sh7723.c
index e5c63911403c..20a31c2255a8 100644
--- a/arch/sh/kernel/cpu/sh4a/clock-sh7723.c
+++ b/arch/sh/kernel/cpu/sh4a/clock-sh7723.c
@@ -190,12 +190,12 @@ static struct clk mstp_clks[] = {
         SH_HWBLK_CLK("usb0", -1, B_CLK, HWBLK_USB, 0),
         SH_HWBLK_CLK("2dg0", -1, B_CLK, HWBLK_2DG, 0),
         SH_HWBLK_CLK("siu0", -1, B_CLK, HWBLK_SIU, 0),
-        SH_HWBLK_CLK("veu1", -1, B_CLK, HWBLK_VEU2H1, CLK_ENABLE_ON_INIT),
+        SH_HWBLK_CLK("veu1", -1, B_CLK, HWBLK_VEU2H1, 0),
         SH_HWBLK_CLK("vou0", -1, B_CLK, HWBLK_VOU, 0),
         SH_HWBLK_CLK("beu0", -1, B_CLK, HWBLK_BEU, 0),
         SH_HWBLK_CLK("ceu0", -1, B_CLK, HWBLK_CEU, 0),
-        SH_HWBLK_CLK("veu0", -1, B_CLK, HWBLK_VEU2H0, CLK_ENABLE_ON_INIT),
-        SH_HWBLK_CLK("vpu0", -1, B_CLK, HWBLK_VPU, CLK_ENABLE_ON_INIT),
+        SH_HWBLK_CLK("veu0", -1, B_CLK, HWBLK_VEU2H0, 0),
+        SH_HWBLK_CLK("vpu0", -1, B_CLK, HWBLK_VPU, 0),
         SH_HWBLK_CLK("lcdc0", -1, B_CLK, HWBLK_LCDC, 0),
 };
 
diff --git a/arch/sh/kernel/cpu/sh4a/clock-sh7724.c b/arch/sh/kernel/cpu/sh4a/clock-sh7724.c
index 627588dfddf0..dfe9192be63e 100644
--- a/arch/sh/kernel/cpu/sh4a/clock-sh7724.c
+++ b/arch/sh/kernel/cpu/sh4a/clock-sh7724.c
@@ -204,17 +204,17 @@ static struct clk mstp_clks[] = {
         SH_HWBLK_CLK("2dg0", -1, B_CLK, HWBLK_2DG, 0),
         SH_HWBLK_CLK("sdhi0", -1, B_CLK, HWBLK_SDHI0, 0),
         SH_HWBLK_CLK("sdhi1", -1, B_CLK, HWBLK_SDHI1, 0),
-        SH_HWBLK_CLK("veu1", -1, B_CLK, HWBLK_VEU1, CLK_ENABLE_ON_INIT),
+        SH_HWBLK_CLK("veu1", -1, B_CLK, HWBLK_VEU1, 0),
         SH_HWBLK_CLK("ceu1", -1, B_CLK, HWBLK_CEU1, 0),
         SH_HWBLK_CLK("beu1", -1, B_CLK, HWBLK_BEU1, 0),
         SH_HWBLK_CLK("2ddmac0", -1, SH_CLK, HWBLK_2DDMAC, 0),
         SH_HWBLK_CLK("spu0", -1, B_CLK, HWBLK_SPU, 0),
-        SH_HWBLK_CLK("jpu0", -1, B_CLK, HWBLK_JPU, CLK_ENABLE_ON_INIT),
+        SH_HWBLK_CLK("jpu0", -1, B_CLK, HWBLK_JPU, 0),
         SH_HWBLK_CLK("vou0", -1, B_CLK, HWBLK_VOU, 0),
         SH_HWBLK_CLK("beu0", -1, B_CLK, HWBLK_BEU0, 0),
         SH_HWBLK_CLK("ceu0", -1, B_CLK, HWBLK_CEU0, 0),
-        SH_HWBLK_CLK("veu0", -1, B_CLK, HWBLK_VEU0, CLK_ENABLE_ON_INIT),
-        SH_HWBLK_CLK("vpu0", -1, B_CLK, HWBLK_VPU, CLK_ENABLE_ON_INIT),
+        SH_HWBLK_CLK("veu0", -1, B_CLK, HWBLK_VEU0, 0),
+        SH_HWBLK_CLK("vpu0", -1, B_CLK, HWBLK_VPU, 0),
         SH_HWBLK_CLK("lcdc0", -1, B_CLK, HWBLK_LCDC, 0),
 };
 
diff --git a/arch/sh/kernel/cpu/sh4a/setup-sh7722.c b/arch/sh/kernel/cpu/sh4a/setup-sh7722.c
index 67b0d87fcb27..35097753456c 100644
--- a/arch/sh/kernel/cpu/sh4a/setup-sh7722.c
+++ b/arch/sh/kernel/cpu/sh4a/setup-sh7722.c
@@ -17,6 +17,7 @@
 #include <linux/sh_timer.h>
 #include <asm/clock.h>
 #include <asm/mmzone.h>
+#include <cpu/sh7722.h>
 
 static struct resource rtc_resources[] = {
         [0] = {
@@ -46,6 +47,9 @@ static struct platform_device rtc_device = {
         .id             = -1,
         .num_resources  = ARRAY_SIZE(rtc_resources),
         .resource       = rtc_resources,
+        .archdata = {
+                .hwblk_id = HWBLK_RTC,
+        },
 };
 
 static struct m66592_platdata usbf_platdata = {
@@ -76,6 +80,9 @@ static struct platform_device usbf_device = {
         },
         .num_resources  = ARRAY_SIZE(usbf_resources),
         .resource       = usbf_resources,
+        .archdata = {
+                .hwblk_id = HWBLK_USBF,
+        },
 };
 
 static struct resource iic_resources[] = {
@@ -97,6 +104,9 @@ static struct platform_device iic_device = {
         .id             = 0, /* "i2c0" clock */
         .num_resources  = ARRAY_SIZE(iic_resources),
         .resource       = iic_resources,
+        .archdata = {
+                .hwblk_id = HWBLK_IIC,
+        },
 };
 
 static struct uio_info vpu_platform_data = {
@@ -125,6 +135,9 @@ static struct platform_device vpu_device = {
         },
         .resource       = vpu_resources,
         .num_resources  = ARRAY_SIZE(vpu_resources),
+        .archdata = {
+                .hwblk_id = HWBLK_VPU,
+        },
 };
 
 static struct uio_info veu_platform_data = {
@@ -153,6 +166,9 @@ static struct platform_device veu_device = {
         },
         .resource       = veu_resources,
         .num_resources  = ARRAY_SIZE(veu_resources),
+        .archdata = {
+                .hwblk_id = HWBLK_VEU,
+        },
 };
 
 static struct uio_info jpu_platform_data = {
@@ -181,6 +197,9 @@ static struct platform_device jpu_device = {
         },
         .resource       = jpu_resources,
         .num_resources  = ARRAY_SIZE(jpu_resources),
+        .archdata = {
+                .hwblk_id = HWBLK_JPU,
+        },
 };
 
 static struct sh_timer_config cmt_platform_data = {
@@ -213,6 +232,9 @@ static struct platform_device cmt_device = {
         },
         .resource       = cmt_resources,
         .num_resources  = ARRAY_SIZE(cmt_resources),
+        .archdata = {
+                .hwblk_id = HWBLK_CMT,
+        },
 };
 
 static struct sh_timer_config tmu0_platform_data = {
@@ -244,6 +266,9 @@ static struct platform_device tmu0_device = {
         },
         .resource       = tmu0_resources,
         .num_resources  = ARRAY_SIZE(tmu0_resources),
+        .archdata = {
+                .hwblk_id = HWBLK_TMU,
+        },
 };
 
 static struct sh_timer_config tmu1_platform_data = {
@@ -275,6 +300,9 @@ static struct platform_device tmu1_device = {
         },
         .resource       = tmu1_resources,
         .num_resources  = ARRAY_SIZE(tmu1_resources),
+        .archdata = {
+                .hwblk_id = HWBLK_TMU,
+        },
 };
 
 static struct sh_timer_config tmu2_platform_data = {
@@ -305,6 +333,9 @@ static struct platform_device tmu2_device = {
         },
         .resource       = tmu2_resources,
         .num_resources  = ARRAY_SIZE(tmu2_resources),
+        .archdata = {
+                .hwblk_id = HWBLK_TMU,
+        },
 };
 
 static struct plat_sci_port sci_platform_data[] = {
diff --git a/arch/sh/kernel/cpu/sh4a/setup-sh7723.c b/arch/sh/kernel/cpu/sh4a/setup-sh7723.c
index 26dc4d323252..4caa5a7ca86e 100644
--- a/arch/sh/kernel/cpu/sh4a/setup-sh7723.c
+++ b/arch/sh/kernel/cpu/sh4a/setup-sh7723.c
@@ -18,6 +18,7 @@
 #include <linux/io.h>
 #include <asm/clock.h>
 #include <asm/mmzone.h>
+#include <cpu/sh7723.h>
 
 static struct uio_info vpu_platform_data = {
         .name = "VPU5",
@@ -45,6 +46,9 @@ static struct platform_device vpu_device = {
         },
         .resource       = vpu_resources,
         .num_resources  = ARRAY_SIZE(vpu_resources),
+        .archdata = {
+                .hwblk_id = HWBLK_VPU,
+        },
 };
 
 static struct uio_info veu0_platform_data = {
@@ -73,6 +77,9 @@ static struct platform_device veu0_device = {
         },
         .resource       = veu0_resources,
         .num_resources  = ARRAY_SIZE(veu0_resources),
+        .archdata = {
+                .hwblk_id = HWBLK_VEU2H0,
+        },
 };
 
 static struct uio_info veu1_platform_data = {
@@ -101,6 +108,9 @@ static struct platform_device veu1_device = {
         },
         .resource       = veu1_resources,
         .num_resources  = ARRAY_SIZE(veu1_resources),
+        .archdata = {
+                .hwblk_id = HWBLK_VEU2H1,
+        },
 };
 
 static struct sh_timer_config cmt_platform_data = {
@@ -133,6 +143,9 @@ static struct platform_device cmt_device = {
         },
         .resource       = cmt_resources,
         .num_resources  = ARRAY_SIZE(cmt_resources),
+        .archdata = {
+                .hwblk_id = HWBLK_CMT,
+        },
 };
 
 static struct sh_timer_config tmu0_platform_data = {
@@ -164,6 +177,9 @@ static struct platform_device tmu0_device = {
         },
         .resource       = tmu0_resources,
         .num_resources  = ARRAY_SIZE(tmu0_resources),
+        .archdata = {
+                .hwblk_id = HWBLK_TMU0,
+        },
 };
 
 static struct sh_timer_config tmu1_platform_data = {
@@ -195,6 +211,9 @@ static struct platform_device tmu1_device = {
         },
         .resource       = tmu1_resources,
         .num_resources  = ARRAY_SIZE(tmu1_resources),
+        .archdata = {
+                .hwblk_id = HWBLK_TMU0,
+        },
 };
 
 static struct sh_timer_config tmu2_platform_data = {
@@ -225,6 +244,9 @@ static struct platform_device tmu2_device = {
         },
         .resource       = tmu2_resources,
         .num_resources  = ARRAY_SIZE(tmu2_resources),
+        .archdata = {
+                .hwblk_id = HWBLK_TMU0,
+        },
 };
 
 static struct sh_timer_config tmu3_platform_data = {
@@ -255,6 +277,9 @@ static struct platform_device tmu3_device = {
         },
         .resource       = tmu3_resources,
         .num_resources  = ARRAY_SIZE(tmu3_resources),
+        .archdata = {
+                .hwblk_id = HWBLK_TMU1,
+        },
 };
 
 static struct sh_timer_config tmu4_platform_data = {
@@ -285,6 +310,9 @@ static struct platform_device tmu4_device = {
         },
         .resource       = tmu4_resources,
         .num_resources  = ARRAY_SIZE(tmu4_resources),
+        .archdata = {
+                .hwblk_id = HWBLK_TMU1,
+        },
 };
 
 static struct sh_timer_config tmu5_platform_data = {
@@ -315,6 +343,9 @@ static struct platform_device tmu5_device = {
         },
         .resource       = tmu5_resources,
         .num_resources  = ARRAY_SIZE(tmu5_resources),
+        .archdata = {
+                .hwblk_id = HWBLK_TMU1,
+        },
 };
 
 static struct plat_sci_port sci_platform_data[] = {
@@ -395,6 +426,9 @@ static struct platform_device rtc_device = {
         .id             = -1,
         .num_resources  = ARRAY_SIZE(rtc_resources),
         .resource       = rtc_resources,
+        .archdata = {
+                .hwblk_id = HWBLK_RTC,
+        },
 };
 
 static struct r8a66597_platdata r8a66597_data = {
@@ -424,6 +458,9 @@ static struct platform_device sh7723_usb_host_device = {
         },
         .num_resources  = ARRAY_SIZE(sh7723_usb_host_resources),
         .resource       = sh7723_usb_host_resources,
+        .archdata = {
+                .hwblk_id = HWBLK_USB,
+        },
 };
 
 static struct resource iic_resources[] = {
@@ -445,6 +482,9 @@ static struct platform_device iic_device = {
         .id             = 0, /* "i2c0" clock */
         .num_resources  = ARRAY_SIZE(iic_resources),
         .resource       = iic_resources,
+        .archdata = {
+                .hwblk_id = HWBLK_IIC,
+        },
 };
 
 static struct platform_device *sh7723_devices[] __initdata = {
diff --git a/arch/sh/kernel/cpu/sh4a/setup-sh7724.c b/arch/sh/kernel/cpu/sh4a/setup-sh7724.c
index a04edaab9a29..f3851fd757ec 100644
--- a/arch/sh/kernel/cpu/sh4a/setup-sh7724.c
+++ b/arch/sh/kernel/cpu/sh4a/setup-sh7724.c
@@ -22,6 +22,7 @@
 #include <linux/io.h>
 #include <asm/clock.h>
 #include <asm/mmzone.h>
+#include <cpu/sh7724.h>
 
 /* Serial */
 static struct plat_sci_port sci_platform_data[] = {
@@ -103,6 +104,9 @@ static struct platform_device rtc_device = {
         .id             = -1,
         .num_resources  = ARRAY_SIZE(rtc_resources),
         .resource       = rtc_resources,
+        .archdata = {
+                .hwblk_id = HWBLK_RTC,
+        },
 };
 
 /* I2C0 */
@@ -125,6 +129,9 @@ static struct platform_device iic0_device = {
         .id             = 0, /* "i2c0" clock */
         .num_resources  = ARRAY_SIZE(iic0_resources),
         .resource       = iic0_resources,
+        .archdata = {
+                .hwblk_id = HWBLK_IIC0,
+        },
 };
 
 /* I2C1 */
@@ -147,6 +154,9 @@ static struct platform_device iic1_device = {
         .id             = 1, /* "i2c1" clock */
         .num_resources  = ARRAY_SIZE(iic1_resources),
         .resource       = iic1_resources,
+        .archdata = {
+                .hwblk_id = HWBLK_IIC1,
+        },
 };
 
 /* VPU */
@@ -176,6 +186,9 @@ static struct platform_device vpu_device = {
         },
         .resource       = vpu_resources,
         .num_resources  = ARRAY_SIZE(vpu_resources),
+        .archdata = {
+                .hwblk_id = HWBLK_VPU,
+        },
 };
 
 /* VEU0 */
@@ -205,6 +218,9 @@ static struct platform_device veu0_device = {
         },
         .resource       = veu0_resources,
         .num_resources  = ARRAY_SIZE(veu0_resources),
+        .archdata = {
+                .hwblk_id = HWBLK_VEU0,
+        },
 };
 
 /* VEU1 */
@@ -234,6 +250,9 @@ static struct platform_device veu1_device = {
         },
         .resource       = veu1_resources,
         .num_resources  = ARRAY_SIZE(veu1_resources),
+        .archdata = {
+                .hwblk_id = HWBLK_VEU1,
+        },
 };
 
 static struct sh_timer_config cmt_platform_data = {
@@ -266,6 +285,9 @@ static struct platform_device cmt_device = {
         },
         .resource       = cmt_resources,
         .num_resources  = ARRAY_SIZE(cmt_resources),
+        .archdata = {
+                .hwblk_id = HWBLK_CMT,
+        },
 };
 
 static struct sh_timer_config tmu0_platform_data = {
@@ -297,6 +319,9 @@ static struct platform_device tmu0_device = {
         },
         .resource       = tmu0_resources,
         .num_resources  = ARRAY_SIZE(tmu0_resources),
+        .archdata = {
+                .hwblk_id = HWBLK_TMU0,
+        },
 };
 
 static struct sh_timer_config tmu1_platform_data = {
@@ -328,6 +353,9 @@ static struct platform_device tmu1_device = {
         },
         .resource       = tmu1_resources,
         .num_resources  = ARRAY_SIZE(tmu1_resources),
+        .archdata = {
+                .hwblk_id = HWBLK_TMU0,
+        },
 };
 
 static struct sh_timer_config tmu2_platform_data = {
@@ -358,6 +386,9 @@ static struct platform_device tmu2_device = {
         },
         .resource       = tmu2_resources,
         .num_resources  = ARRAY_SIZE(tmu2_resources),
+        .archdata = {
+                .hwblk_id = HWBLK_TMU0,
+        },
 };
 
 
@@ -389,6 +420,9 @@ static struct platform_device tmu3_device = {
         },
         .resource       = tmu3_resources,
         .num_resources  = ARRAY_SIZE(tmu3_resources),
+        .archdata = {
+                .hwblk_id = HWBLK_TMU1,
+        },
 };
 
 static struct sh_timer_config tmu4_platform_data = {
@@ -419,6 +453,9 @@ static struct platform_device tmu4_device = {
         },
         .resource       = tmu4_resources,
         .num_resources  = ARRAY_SIZE(tmu4_resources),
+        .archdata = {
+                .hwblk_id = HWBLK_TMU1,
+        },
 };
 
 static struct sh_timer_config tmu5_platform_data = {
@@ -449,6 +486,9 @@ static struct platform_device tmu5_device = {
         },
         .resource       = tmu5_resources,
         .num_resources  = ARRAY_SIZE(tmu5_resources),
+        .archdata = {
+                .hwblk_id = HWBLK_TMU1,
+        },
 };
 
 /* JPU */
@@ -478,6 +518,9 @@ static struct platform_device jpu_device = {
         },
         .resource       = jpu_resources,
         .num_resources  = ARRAY_SIZE(jpu_resources),
+        .archdata = {
+                .hwblk_id = HWBLK_JPU,
+        },
 };
 
 static struct platform_device *sh7724_devices[] __initdata = {
diff --git a/arch/sh/kernel/cpu/shmobile/Makefile b/arch/sh/kernel/cpu/shmobile/Makefile
index e8a5111e848a..a39f88ea1a85 100644
--- a/arch/sh/kernel/cpu/shmobile/Makefile
+++ b/arch/sh/kernel/cpu/shmobile/Makefile
@@ -5,3 +5,4 @@
 # Power Management & Sleep mode
 obj-$(CONFIG_PM)        += pm.o sleep.o
 obj-$(CONFIG_CPU_IDLE)  += cpuidle.o
+obj-$(CONFIG_PM_RUNTIME)        += pm_runtime.o
diff --git a/arch/sh/kernel/cpu/shmobile/pm_runtime.c b/arch/sh/kernel/cpu/shmobile/pm_runtime.c
new file mode 100644
index 000000000000..7c615b17e209
--- /dev/null
+++ b/arch/sh/kernel/cpu/shmobile/pm_runtime.c
@@ -0,0 +1,303 @@
+/*
+ * arch/sh/kernel/cpu/shmobile/pm_runtime.c
+ *
+ * Runtime PM support code for SuperH Mobile
+ *
+ *  Copyright (C) 2009 Magnus Damm
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/io.h>
+#include <linux/pm_runtime.h>
+#include <linux/platform_device.h>
+#include <linux/mutex.h>
+#include <asm/hwblk.h>
+
+static DEFINE_SPINLOCK(hwblk_lock);
+static LIST_HEAD(hwblk_idle_list);
+static struct work_struct hwblk_work;
+
+extern struct hwblk_info *hwblk_info;
+
+static void platform_pm_runtime_not_idle(struct platform_device *pdev)
+{
+        unsigned long flags;
+
+        /* remove device from idle list */
+        spin_lock_irqsave(&hwblk_lock, flags);
+        if (test_bit(PDEV_ARCHDATA_FLAG_IDLE, &pdev->archdata.flags)) {
+                list_del(&pdev->archdata.entry);
+                __clear_bit(PDEV_ARCHDATA_FLAG_IDLE, &pdev->archdata.flags);
+        }
+        spin_unlock_irqrestore(&hwblk_lock, flags);
+}
+
+static int __platform_pm_runtime_resume(struct platform_device *pdev)
+{
+        struct device *d = &pdev->dev;
+        struct pdev_archdata *ad = &pdev->archdata;
+        int hwblk = ad->hwblk_id;
+        int ret = -ENOSYS;
+
+        dev_dbg(d, "__platform_pm_runtime_resume() [%d]\n", hwblk);
+
+        if (d->driver && d->driver->pm && d->driver->pm->runtime_resume) {
+                hwblk_enable(hwblk_info, hwblk);
+                ret = 0;
+
+                if (test_bit(PDEV_ARCHDATA_FLAG_SUSP, &ad->flags)) {
+                        ret = d->driver->pm->runtime_resume(d);
+                        if (!ret)
+                                clear_bit(PDEV_ARCHDATA_FLAG_SUSP, &ad->flags);
+                        else
+                                hwblk_disable(hwblk_info, hwblk);
+                }
+        }
+
+        dev_dbg(d, "__platform_pm_runtime_resume() [%d] - returns %d\n",
+                hwblk, ret);
+
+        return ret;
+}
+
+static int __platform_pm_runtime_suspend(struct platform_device *pdev)
+{
+        struct device *d = &pdev->dev;
+        struct pdev_archdata *ad = &pdev->archdata;
+        int hwblk = ad->hwblk_id;
+        int ret = -ENOSYS;
+
+        dev_dbg(d, "__platform_pm_runtime_suspend() [%d]\n", hwblk);
+
+        if (d->driver && d->driver->pm && d->driver->pm->runtime_suspend) {
+                BUG_ON(!test_bit(PDEV_ARCHDATA_FLAG_IDLE, &ad->flags));
+
+                hwblk_enable(hwblk_info, hwblk);
+                ret = d->driver->pm->runtime_suspend(d);
+                hwblk_disable(hwblk_info, hwblk);
+
+                if (!ret) {
+                        set_bit(PDEV_ARCHDATA_FLAG_SUSP, &ad->flags);
+                        platform_pm_runtime_not_idle(pdev);
+                        hwblk_cnt_dec(hwblk_info, hwblk, HWBLK_CNT_IDLE);
+                }
+        }
+
+        dev_dbg(d, "__platform_pm_runtime_suspend() [%d] - returns %d\n",
+                hwblk, ret);
+
+        return ret;
+}
+
+static void platform_pm_runtime_work(struct work_struct *work)
+{
+        struct platform_device *pdev;
+        unsigned long flags;
+        int ret;
+
+        /* go through the idle list and suspend one device at a time */
+        do {
+                spin_lock_irqsave(&hwblk_lock, flags);
+                if (list_empty(&hwblk_idle_list))
+                        pdev = NULL;
+                else
+                        pdev = list_first_entry(&hwblk_idle_list,
+                                                struct platform_device,
+                                                archdata.entry);
+                spin_unlock_irqrestore(&hwblk_lock, flags);
+
+                if (pdev) {
+                        mutex_lock(&pdev->archdata.mutex);
+                        ret = __platform_pm_runtime_suspend(pdev);
+
+                        /* at this point the platform device may be:
+                         * suspended: ret = 0, FLAG_SUSP set, clock stopped
+                         * failed: ret < 0, FLAG_IDLE set, clock stopped
+                         */
+                        mutex_unlock(&pdev->archdata.mutex);
+                } else {
+                        ret = -ENODEV;
+                }
+        } while (!ret);
+}
+
+/* this function gets called from cpuidle context when all devices in the
+ * main power domain are unused but some are counted as idle, ie the hwblk
+ * counter values are (HWBLK_CNT_USAGE == 0) && (HWBLK_CNT_IDLE != 0)
+ */
+void platform_pm_runtime_suspend_idle(void)
+{
+        queue_work(pm_wq, &hwblk_work);
+}
+
+int platform_pm_runtime_suspend(struct device *dev)
+{
+        struct platform_device *pdev = to_platform_device(dev);
+        struct pdev_archdata *ad = &pdev->archdata;
+        unsigned long flags;
+        int hwblk = ad->hwblk_id;
+        int ret = 0;
+
+        dev_dbg(dev, "platform_pm_runtime_suspend() [%d]\n", hwblk);
+
+        /* ignore off-chip platform devices */
+        if (!hwblk)
+                goto out;
+
+        /* interrupt context not allowed */
+        might_sleep();
+
+        /* catch misconfigured drivers not starting with resume */
+        if (test_bit(PDEV_ARCHDATA_FLAG_INIT, &pdev->archdata.flags)) {
+                ret = -EINVAL;
+                goto out;
+        }
+
+        /* serialize */
+        mutex_lock(&ad->mutex);
+
+        /* disable clock */
+        hwblk_disable(hwblk_info, hwblk);
+
+        /* put device on idle list */
+        spin_lock_irqsave(&hwblk_lock, flags);
+        list_add_tail(&pdev->archdata.entry, &hwblk_idle_list);
+        __set_bit(PDEV_ARCHDATA_FLAG_IDLE, &pdev->archdata.flags);
+        spin_unlock_irqrestore(&hwblk_lock, flags);
+
+        /* increase idle count */
+        hwblk_cnt_inc(hwblk_info, hwblk, HWBLK_CNT_IDLE);
+
+        /* at this point the platform device is:
+         * idle: ret = 0, FLAG_IDLE set, clock stopped
+         */
+        mutex_unlock(&ad->mutex);
+
+out:
+        dev_dbg(dev, "platform_pm_runtime_suspend() [%d] returns %d\n",
+                hwblk, ret);
+
+        return ret;
+}
+
+int platform_pm_runtime_resume(struct device *dev)
+{
+        struct platform_device *pdev = to_platform_device(dev);
+        struct pdev_archdata *ad = &pdev->archdata;
+        int hwblk = ad->hwblk_id;
+        int ret = 0;
+
+        dev_dbg(dev, "platform_pm_runtime_resume() [%d]\n", hwblk);
+
+        /* ignore off-chip platform devices */
+        if (!hwblk)
+                goto out;
+
+        /* interrupt context not allowed */
+        might_sleep();
+
+        /* serialize */
+        mutex_lock(&ad->mutex);
+
+        /* make sure device is removed from idle list */
+        platform_pm_runtime_not_idle(pdev);
+
+        /* decrease idle count */
+        if (!test_bit(PDEV_ARCHDATA_FLAG_INIT, &pdev->archdata.flags) &&
+            !test_bit(PDEV_ARCHDATA_FLAG_SUSP, &pdev->archdata.flags))
+                hwblk_cnt_dec(hwblk_info, hwblk, HWBLK_CNT_IDLE);
+
+        /* resume the device if needed */
+        ret = __platform_pm_runtime_resume(pdev);
+
+        /* the driver has been initialized now, so clear the init flag */
+        clear_bit(PDEV_ARCHDATA_FLAG_INIT, &pdev->archdata.flags);
+
+        /* at this point the platform device may be:
+         * resumed: ret = 0, flags = 0, clock started
+         * failed: ret < 0, FLAG_SUSP set, clock stopped
+         */
+        mutex_unlock(&ad->mutex);
+out:
+        dev_dbg(dev, "platform_pm_runtime_resume() [%d] returns %d\n",
+                hwblk, ret);
+
+        return ret;
+}
+
+int platform_pm_runtime_idle(struct device *dev)
+{
+        struct platform_device *pdev = to_platform_device(dev);
+        int hwblk = pdev->archdata.hwblk_id;
+        int ret = 0;
+
+        dev_dbg(dev, "platform_pm_runtime_idle() [%d]\n", hwblk);
+
+        /* ignore off-chip platform devices */
+        if (!hwblk)
+                goto out;
+
+        /* interrupt context not allowed, use pm_runtime_put()! */
+        might_sleep();
+
+        /* suspend synchronously to disable clocks immediately */
+        ret = pm_runtime_suspend(dev);
+out:
+        dev_dbg(dev, "platform_pm_runtime_idle() [%d] done!\n", hwblk);
+        return ret;
+}
+
+static int platform_bus_notify(struct notifier_block *nb,
+                               unsigned long action, void *data)
+{
+        struct device *dev = data;
+        struct platform_device *pdev = to_platform_device(dev);
+        int hwblk = pdev->archdata.hwblk_id;
+
+        /* ignore off-chip platform devices */
+        if (!hwblk)
+                return 0;
+
+        switch (action) {
+        case BUS_NOTIFY_ADD_DEVICE:
+                INIT_LIST_HEAD(&pdev->archdata.entry);
+                mutex_init(&pdev->archdata.mutex);
+                /* platform devices without drivers should be disabled */
+                hwblk_enable(hwblk_info, hwblk);
+                hwblk_disable(hwblk_info, hwblk);
+                /* make sure driver re-inits itself once */
+                __set_bit(PDEV_ARCHDATA_FLAG_INIT, &pdev->archdata.flags);
+                break;
+        /* TODO: add BUS_NOTIFY_BIND_DRIVER and increase idle count */
+        case BUS_NOTIFY_BOUND_DRIVER:
+                /* keep track of number of devices in use per hwblk */
+                hwblk_cnt_inc(hwblk_info, hwblk, HWBLK_CNT_DEVICES);
+                break;
+        case BUS_NOTIFY_UNBOUND_DRIVER:
+                /* keep track of number of devices in use per hwblk */
+                hwblk_cnt_dec(hwblk_info, hwblk, HWBLK_CNT_DEVICES);
+                /* make sure driver re-inits itself once */
+                __set_bit(PDEV_ARCHDATA_FLAG_INIT, &pdev->archdata.flags);
+                break;
+        case BUS_NOTIFY_DEL_DEVICE:
+                break;
+        }
+        return 0;
+}
+
+static struct notifier_block platform_bus_notifier = {
+        .notifier_call = platform_bus_notify
+};
+
+static int __init sh_pm_runtime_init(void)
+{
+        INIT_WORK(&hwblk_work, platform_pm_runtime_work);
+
+        bus_register_notifier(&platform_bus_type, &platform_bus_notifier);
+        return 0;
+}
+core_initcall(sh_pm_runtime_init);