[Blackfin] arch: Functional power management support: Add CPU and platform voltage scaling support

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

15 files changed, 468 insertions, 28 deletions

diff --git a/arch/blackfin/Kconfig b/arch/blackfin/Kconfig
index 7f1ab802537f..c8def1cf1758 100644
--- a/arch/blackfin/Kconfig
+++ b/arch/blackfin/Kconfig
@@ -967,6 +967,17 @@ menu "CPU Frequency scaling"
 
 source "drivers/cpufreq/Kconfig"
 
+config CPU_VOLTAGE
+        bool "CPU Voltage scaling"
+        depends on EXPERIMENTAL 
+        depends on CPU_FREQ
+        default n
+        help
+          Say Y here if you want CPU voltage scaling according to the CPU frequency.
+          This option violates the PLL BYPASS recommendation in the Blackfin Processor
+          manuals. There is a theoretical risk that during VDDINT transitions 
+          the PLL may unlock.
+
 endmenu
 
 source "net/Kconfig"
diff --git a/arch/blackfin/mach-bf527/boards/ezkit.c b/arch/blackfin/mach-bf527/boards/ezkit.c
index 583d53811f03..90dd0869edc9 100644
--- a/arch/blackfin/mach-bf527/boards/ezkit.c
+++ b/arch/blackfin/mach-bf527/boards/ezkit.c
@@ -50,6 +50,7 @@
 #include <asm/reboot.h>
 #include <asm/nand.h>
 #include <asm/portmux.h>
+#include <asm/dpmc.h>
 #include <linux/spi/ad7877.h>
 
 /*
@@ -839,7 +840,32 @@ static struct platform_device bfin_gpios_device = {
         .resource = &bfin_gpios_resources,
 };
 
+static const unsigned int cclk_vlev_datasheet[] =
+{
+        VRPAIR(VLEV_100, 400000000),
+        VRPAIR(VLEV_105, 426000000),
+        VRPAIR(VLEV_110, 500000000),
+        VRPAIR(VLEV_115, 533000000),
+        VRPAIR(VLEV_120, 600000000),
+};
+
+static struct bfin_dpmc_platform_data bfin_dmpc_vreg_data = {
+        .tuple_tab = cclk_vlev_datasheet,
+        .tabsize = ARRAY_SIZE(cclk_vlev_datasheet),
+        .vr_settling_time = 25 /* us */,
+};
+
+static struct platform_device bfin_dpmc = {
+        .name = "bfin dpmc",
+        .dev = {
+                .platform_data = &bfin_dmpc_vreg_data,
+        },
+};
+
 static struct platform_device *stamp_devices[] __initdata = {
+
+        &bfin_dpmc,
+
 #if defined(CONFIG_MTD_NAND_BF5XX) || defined(CONFIG_MTD_NAND_BF5XX_MODULE)
         &bf5xx_nand_device,
 #endif
diff --git a/arch/blackfin/mach-bf533/boards/cm_bf533.c b/arch/blackfin/mach-bf533/boards/cm_bf533.c
index a03149c72681..170ab57ef6e7 100644
--- a/arch/blackfin/mach-bf533/boards/cm_bf533.c
+++ b/arch/blackfin/mach-bf533/boards/cm_bf533.c
@@ -39,6 +39,7 @@
 #include <asm/dma.h>
 #include <asm/bfin5xx_spi.h>
 #include <asm/portmux.h>
+#include <asm/dpmc.h>
 
 /*
  * Name the Board for the /proc/cpuinfo
@@ -341,7 +342,37 @@ static struct platform_device bfin_pata_device = {
 };
 #endif
 
+static const unsigned int cclk_vlev_datasheet[] =
+{
+        VRPAIR(VLEV_085, 250000000),
+        VRPAIR(VLEV_090, 376000000),
+        VRPAIR(VLEV_095, 426000000),
+        VRPAIR(VLEV_100, 426000000),
+        VRPAIR(VLEV_105, 476000000),
+        VRPAIR(VLEV_110, 476000000),
+        VRPAIR(VLEV_115, 476000000),
+        VRPAIR(VLEV_120, 600000000),
+        VRPAIR(VLEV_125, 600000000),
+        VRPAIR(VLEV_130, 600000000),
+};
+
+static struct bfin_dpmc_platform_data bfin_dmpc_vreg_data = {
+        .tuple_tab = cclk_vlev_datasheet,
+        .tabsize = ARRAY_SIZE(cclk_vlev_datasheet),
+        .vr_settling_time = 25 /* us */,
+};
+
+static struct platform_device bfin_dpmc = {
+        .name = "bfin dpmc",
+        .dev = {
+                .platform_data = &bfin_dmpc_vreg_data,
+        },
+};
+
 static struct platform_device *cm_bf533_devices[] __initdata = {
+
+        &bfin_dpmc,
+
 #if defined(CONFIG_SERIAL_BFIN) || defined(CONFIG_SERIAL_BFIN_MODULE)
         &bfin_uart_device,
 #endif
diff --git a/arch/blackfin/mach-bf533/boards/ezkit.c b/arch/blackfin/mach-bf533/boards/ezkit.c
index 08a7943949ae..9d28415163ea 100644
--- a/arch/blackfin/mach-bf533/boards/ezkit.c
+++ b/arch/blackfin/mach-bf533/boards/ezkit.c
@@ -42,6 +42,7 @@
 #include <asm/dma.h>
 #include <asm/bfin5xx_spi.h>
 #include <asm/portmux.h>
+#include <asm/dpmc.h>
 
 /*
  * Name the Board for the /proc/cpuinfo
@@ -350,7 +351,37 @@ static struct platform_device i2c_gpio_device = {
 };
 #endif
 
+static const unsigned int cclk_vlev_datasheet[] =
+{
+        VRPAIR(VLEV_085, 250000000),
+        VRPAIR(VLEV_090, 376000000),
+        VRPAIR(VLEV_095, 426000000),
+        VRPAIR(VLEV_100, 426000000),
+        VRPAIR(VLEV_105, 476000000),
+        VRPAIR(VLEV_110, 476000000),
+        VRPAIR(VLEV_115, 476000000),
+        VRPAIR(VLEV_120, 600000000),
+        VRPAIR(VLEV_125, 600000000),
+        VRPAIR(VLEV_130, 600000000),
+};
+
+static struct bfin_dpmc_platform_data bfin_dmpc_vreg_data = {
+        .tuple_tab = cclk_vlev_datasheet,
+        .tabsize = ARRAY_SIZE(cclk_vlev_datasheet),
+        .vr_settling_time = 25 /* us */,
+};
+
+static struct platform_device bfin_dpmc = {
+        .name = "bfin dpmc",
+        .dev = {
+                .platform_data = &bfin_dmpc_vreg_data,
+        },
+};
+
 static struct platform_device *ezkit_devices[] __initdata = {
+
+        &bfin_dpmc,
+
 #if defined(CONFIG_SMC91X) || defined(CONFIG_SMC91X_MODULE)
         &smc91x_device,
 #endif
diff --git a/arch/blackfin/mach-bf533/boards/stamp.c b/arch/blackfin/mach-bf533/boards/stamp.c
index 024f418ae543..7fd35fb32fd5 100644
--- a/arch/blackfin/mach-bf533/boards/stamp.c
+++ b/arch/blackfin/mach-bf533/boards/stamp.c
@@ -45,6 +45,7 @@
 #include <asm/bfin5xx_spi.h>
 #include <asm/reboot.h>
 #include <asm/portmux.h>
+#include <asm/dpmc.h>
 
 /*
  * Name the Board for the /proc/cpuinfo
@@ -516,7 +517,37 @@ static struct i2c_board_info __initdata bfin_i2c_board_info[] = {
 };
 #endif
 
+static const unsigned int cclk_vlev_datasheet[] =
+{
+        VRPAIR(VLEV_085, 250000000),
+        VRPAIR(VLEV_090, 376000000),
+        VRPAIR(VLEV_095, 426000000),
+        VRPAIR(VLEV_100, 426000000),
+        VRPAIR(VLEV_105, 476000000),
+        VRPAIR(VLEV_110, 476000000),
+        VRPAIR(VLEV_115, 476000000),
+        VRPAIR(VLEV_120, 600000000),
+        VRPAIR(VLEV_125, 600000000),
+        VRPAIR(VLEV_130, 600000000),
+};
+
+static struct bfin_dpmc_platform_data bfin_dmpc_vreg_data = {
+        .tuple_tab = cclk_vlev_datasheet,
+        .tabsize = ARRAY_SIZE(cclk_vlev_datasheet),
+        .vr_settling_time = 25 /* us */,
+};
+
+static struct platform_device bfin_dpmc = {
+        .name = "bfin dpmc",
+        .dev = {
+                .platform_data = &bfin_dmpc_vreg_data,
+        },
+};
+
 static struct platform_device *stamp_devices[] __initdata = {
+
+        &bfin_dpmc,
+
 #if defined(CONFIG_RTC_DRV_BFIN) || defined(CONFIG_RTC_DRV_BFIN_MODULE)
         &rtc_device,
 #endif
diff --git a/arch/blackfin/mach-bf537/boards/cm_bf537.c b/arch/blackfin/mach-bf537/boards/cm_bf537.c
index d8a23cd9b9ed..706e1a574f09 100644
--- a/arch/blackfin/mach-bf537/boards/cm_bf537.c
+++ b/arch/blackfin/mach-bf537/boards/cm_bf537.c
@@ -41,6 +41,7 @@
 #include <asm/dma.h>
 #include <asm/bfin5xx_spi.h>
 #include <asm/portmux.h>
+#include <asm/dpmc.h>
 
 /*
  * Name the Board for the /proc/cpuinfo
@@ -428,7 +429,37 @@ static struct platform_device bfin_pata_device = {
 };
 #endif
 
+static const unsigned int cclk_vlev_datasheet[] =
+{
+        VRPAIR(VLEV_085, 250000000),
+        VRPAIR(VLEV_090, 376000000),
+        VRPAIR(VLEV_095, 426000000),
+        VRPAIR(VLEV_100, 426000000),
+        VRPAIR(VLEV_105, 476000000),
+        VRPAIR(VLEV_110, 476000000),
+        VRPAIR(VLEV_115, 476000000),
+        VRPAIR(VLEV_120, 500000000),
+        VRPAIR(VLEV_125, 533000000),
+        VRPAIR(VLEV_130, 600000000),
+};
+
+static struct bfin_dpmc_platform_data bfin_dmpc_vreg_data = {
+        .tuple_tab = cclk_vlev_datasheet,
+        .tabsize = ARRAY_SIZE(cclk_vlev_datasheet),
+        .vr_settling_time = 25 /* us */,
+};
+
+static struct platform_device bfin_dpmc = {
+        .name = "bfin dpmc",
+        .dev = {
+                .platform_data = &bfin_dmpc_vreg_data,
+        },
+};
+
 static struct platform_device *cm_bf537_devices[] __initdata = {
+
+        &bfin_dpmc,
+
 #if defined(CONFIG_FB_HITACHI_TX09) || defined(CONFIG_FB_HITACHI_TX09_MODULE)
         &hitachi_fb_device,
 #endif
diff --git a/arch/blackfin/mach-bf537/boards/stamp.c b/arch/blackfin/mach-bf537/boards/stamp.c
index d3727b7c2d7d..9a756d1f3d73 100644
--- a/arch/blackfin/mach-bf537/boards/stamp.c
+++ b/arch/blackfin/mach-bf537/boards/stamp.c
@@ -47,6 +47,7 @@
 #include <asm/bfin5xx_spi.h>
 #include <asm/reboot.h>
 #include <asm/portmux.h>
+#include <asm/dpmc.h>
 #include <linux/spi/ad7877.h>
 
 /*
@@ -817,7 +818,37 @@ static struct platform_device bfin_pata_device = {
 };
 #endif
 
+static const unsigned int cclk_vlev_datasheet[] =
+{
+        VRPAIR(VLEV_085, 250000000),
+        VRPAIR(VLEV_090, 376000000),
+        VRPAIR(VLEV_095, 426000000),
+        VRPAIR(VLEV_100, 426000000),
+        VRPAIR(VLEV_105, 476000000),
+        VRPAIR(VLEV_110, 476000000),
+        VRPAIR(VLEV_115, 476000000),
+        VRPAIR(VLEV_120, 500000000),
+        VRPAIR(VLEV_125, 533000000),
+        VRPAIR(VLEV_130, 600000000),
+};
+
+static struct bfin_dpmc_platform_data bfin_dmpc_vreg_data = {
+        .tuple_tab = cclk_vlev_datasheet,
+        .tabsize = ARRAY_SIZE(cclk_vlev_datasheet),
+        .vr_settling_time = 25 /* us */,
+};
+
+static struct platform_device bfin_dpmc = {
+        .name = "bfin dpmc",
+        .dev = {
+                .platform_data = &bfin_dmpc_vreg_data,
+        },
+};
+
 static struct platform_device *stamp_devices[] __initdata = {
+
+        &bfin_dpmc,
+
 #if defined(CONFIG_BFIN_CFPCMCIA) || defined(CONFIG_BFIN_CFPCMCIA_MODULE)
         &bfin_pcmcia_cf_device,
 #endif
diff --git a/arch/blackfin/mach-bf548/boards/cm_bf548.c b/arch/blackfin/mach-bf548/boards/cm_bf548.c
index e3e8479fffb5..40504eeadec9 100644
--- a/arch/blackfin/mach-bf548/boards/cm_bf548.c
+++ b/arch/blackfin/mach-bf548/boards/cm_bf548.c
@@ -44,6 +44,7 @@
 #include <asm/nand.h>
 #include <asm/portmux.h>
 #include <asm/mach/bf54x_keys.h>
+#include <asm/dpmc.h>
 #include <linux/input.h>
 #include <linux/spi/ad7877.h>
 
@@ -590,7 +591,38 @@ static struct platform_device bfin_device_gpiokeys = {
 };
 #endif
 
+static const unsigned int cclk_vlev_datasheet[] =
+{
+/*
+ * Internal VLEV BF54XSBBC1533
+ ****temporarily using these values until data sheet is updated
+ */
+        VRPAIR(VLEV_085, 150000000),
+        VRPAIR(VLEV_090, 250000000),
+        VRPAIR(VLEV_110, 276000000),
+        VRPAIR(VLEV_115, 301000000),
+        VRPAIR(VLEV_120, 525000000),
+        VRPAIR(VLEV_125, 550000000),
+        VRPAIR(VLEV_130, 600000000),
+};
+
+static struct bfin_dpmc_platform_data bfin_dmpc_vreg_data = {
+        .tuple_tab = cclk_vlev_datasheet,
+        .tabsize = ARRAY_SIZE(cclk_vlev_datasheet),
+        .vr_settling_time = 25 /* us */,
+};
+
+static struct platform_device bfin_dpmc = {
+        .name = "bfin dpmc",
+        .dev = {
+                .platform_data = &bfin_dmpc_vreg_data,
+        },
+};
+
 static struct platform_device *cm_bf548_devices[] __initdata = {
+
+        &bfin_dpmc,
+
 #if defined(CONFIG_RTC_DRV_BFIN) || defined(CONFIG_RTC_DRV_BFIN_MODULE)
         &rtc_device,
 #endif
diff --git a/arch/blackfin/mach-bf548/boards/ezkit.c b/arch/blackfin/mach-bf548/boards/ezkit.c
index b00f68ac6bc9..d1682bb37509 100644
--- a/arch/blackfin/mach-bf548/boards/ezkit.c
+++ b/arch/blackfin/mach-bf548/boards/ezkit.c
@@ -46,6 +46,7 @@
 #include <asm/dma.h>
 #include <asm/gpio.h>
 #include <asm/nand.h>
+#include <asm/dpmc.h>
 #include <asm/portmux.h>
 #include <asm/mach/bf54x_keys.h>
 #include <linux/input.h>
@@ -689,7 +690,38 @@ static struct platform_device bfin_gpios_device = {
         .resource = &bfin_gpios_resources,
 };
 
+static const unsigned int cclk_vlev_datasheet[] =
+{
+/*
+ * Internal VLEV BF54XSBBC1533
+ ****temporarily using these values until data sheet is updated
+ */
+        VRPAIR(VLEV_085, 150000000),
+        VRPAIR(VLEV_090, 250000000),
+        VRPAIR(VLEV_110, 276000000),
+        VRPAIR(VLEV_115, 301000000),
+        VRPAIR(VLEV_120, 525000000),
+        VRPAIR(VLEV_125, 550000000),
+        VRPAIR(VLEV_130, 600000000),
+};
+
+static struct bfin_dpmc_platform_data bfin_dmpc_vreg_data = {
+        .tuple_tab = cclk_vlev_datasheet,
+        .tabsize = ARRAY_SIZE(cclk_vlev_datasheet),
+        .vr_settling_time = 25 /* us */,
+};
+
+static struct platform_device bfin_dpmc = {
+        .name = "bfin dpmc",
+        .dev = {
+                .platform_data = &bfin_dmpc_vreg_data,
+        },
+};
+
 static struct platform_device *ezkit_devices[] __initdata = {
+
+        &bfin_dpmc,
+
 #if defined(CONFIG_RTC_DRV_BFIN) || defined(CONFIG_RTC_DRV_BFIN_MODULE)
         &rtc_device,
 #endif
diff --git a/arch/blackfin/mach-bf561/boards/cm_bf561.c b/arch/blackfin/mach-bf561/boards/cm_bf561.c
index 9fd580952fd8..4075dafcbc80 100644
--- a/arch/blackfin/mach-bf561/boards/cm_bf561.c
+++ b/arch/blackfin/mach-bf561/boards/cm_bf561.c
@@ -39,6 +39,7 @@
 #include <asm/dma.h>
 #include <asm/bfin5xx_spi.h>
 #include <asm/portmux.h>
+#include <asm/dpmc.h>
 
 /*
  * Name the Board for the /proc/cpuinfo
@@ -339,8 +340,37 @@ static struct platform_device bfin_pata_device = {
 };
 #endif
 
+static const unsigned int cclk_vlev_datasheet[] =
+{
+        VRPAIR(VLEV_085, 250000000),
+        VRPAIR(VLEV_090, 300000000),
+        VRPAIR(VLEV_095, 313000000),
+        VRPAIR(VLEV_100, 350000000),
+        VRPAIR(VLEV_105, 400000000),
+        VRPAIR(VLEV_110, 444000000),
+        VRPAIR(VLEV_115, 450000000),
+        VRPAIR(VLEV_120, 475000000),
+        VRPAIR(VLEV_125, 500000000),
+        VRPAIR(VLEV_130, 600000000),
+};
+
+static struct bfin_dpmc_platform_data bfin_dmpc_vreg_data = {
+        .tuple_tab = cclk_vlev_datasheet,
+        .tabsize = ARRAY_SIZE(cclk_vlev_datasheet),
+        .vr_settling_time = 25 /* us */,
+};
+
+static struct platform_device bfin_dpmc = {
+        .name = "bfin dpmc",
+        .dev = {
+                .platform_data = &bfin_dmpc_vreg_data,
+        },
+};
+
 static struct platform_device *cm_bf561_devices[] __initdata = {
 
+        &bfin_dpmc,
+
 #if defined(CONFIG_FB_HITACHI_TX09) || defined(CONFIG_FB_HITACHI_TX09_MODULE)
         &hitachi_fb_device,
 #endif
diff --git a/arch/blackfin/mach-bf561/boards/ezkit.c b/arch/blackfin/mach-bf561/boards/ezkit.c
index 0d74b7d99209..61d8f7648b24 100644
--- a/arch/blackfin/mach-bf561/boards/ezkit.c
+++ b/arch/blackfin/mach-bf561/boards/ezkit.c
@@ -39,6 +39,7 @@
 #include <asm/dma.h>
 #include <asm/bfin5xx_spi.h>
 #include <asm/portmux.h>
+#include <asm/dpmc.h>
 
 /*
  * Name the Board for the /proc/cpuinfo
@@ -443,7 +444,37 @@ static struct platform_device i2c_gpio_device = {
 };
 #endif
 
+static const unsigned int cclk_vlev_datasheet[] =
+{
+        VRPAIR(VLEV_085, 250000000),
+        VRPAIR(VLEV_090, 300000000),
+        VRPAIR(VLEV_095, 313000000),
+        VRPAIR(VLEV_100, 350000000),
+        VRPAIR(VLEV_105, 400000000),
+        VRPAIR(VLEV_110, 444000000),
+        VRPAIR(VLEV_115, 450000000),
+        VRPAIR(VLEV_120, 475000000),
+        VRPAIR(VLEV_125, 500000000),
+        VRPAIR(VLEV_130, 600000000),
+};
+
+static struct bfin_dpmc_platform_data bfin_dmpc_vreg_data = {
+        .tuple_tab = cclk_vlev_datasheet,
+        .tabsize = ARRAY_SIZE(cclk_vlev_datasheet),
+        .vr_settling_time = 25 /* us */,
+};
+
+static struct platform_device bfin_dpmc = {
+        .name = "bfin dpmc",
+        .dev = {
+                .platform_data = &bfin_dmpc_vreg_data,
+        },
+};
+
 static struct platform_device *ezkit_devices[] __initdata = {
+
+        &bfin_dpmc,
+
 #if defined(CONFIG_SMC91X) || defined(CONFIG_SMC91X_MODULE)
         &smc91x_device,
 #endif
diff --git a/arch/blackfin/mach-common/Makefile b/arch/blackfin/mach-common/Makefile
index 393081e9b680..422bfee34adc 100644
--- a/arch/blackfin/mach-common/Makefile
+++ b/arch/blackfin/mach-common/Makefile
@@ -6,5 +6,6 @@ obj-y := \
         cache.o cacheinit.o entry.o \
         interrupt.o lock.o irqpanic.o arch_checks.o ints-priority.o
 
-obj-$(CONFIG_PM)         += pm.o dpmc.o
-obj-$(CONFIG_CPU_FREQ)   += cpufreq.o
+obj-$(CONFIG_PM)          += pm.o dpmc_modes.o
+obj-$(CONFIG_CPU_FREQ)    += cpufreq.o
+obj-$(CONFIG_CPU_VOLTAGE) += dpmc.o
diff --git a/arch/blackfin/mach-common/dpmc.c b/arch/blackfin/mach-common/dpmc.c
new file mode 100644
index 000000000000..02c7efd1bcf4
--- /dev/null
+++ b/arch/blackfin/mach-common/dpmc.c
@@ -0,0 +1,137 @@
+/*
+ * Copyright 2008 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/cdev.h>
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/types.h>
+#include <linux/cpufreq.h>
+
+#include <asm/delay.h>
+#include <asm/dpmc.h>
+
+#define DRIVER_NAME "bfin dpmc"
+
+#define dprintk(msg...) \
+        cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, DRIVER_NAME, msg)
+
+struct bfin_dpmc_platform_data *pdata;
+
+/**
+ *      bfin_set_vlev - Update VLEV field in VR_CTL Reg.
+ *                      Avoid BYPASS sequence
+ */
+static void bfin_set_vlev(unsigned int vlev)
+{
+        unsigned pll_lcnt;
+
+        pll_lcnt = bfin_read_PLL_LOCKCNT();
+
+        bfin_write_PLL_LOCKCNT(1);
+        bfin_write_VR_CTL((bfin_read_VR_CTL() & ~VLEV) | vlev);
+        bfin_write_PLL_LOCKCNT(pll_lcnt);
+}
+
+/**
+ *      bfin_get_vlev - Get CPU specific VLEV from platform device data
+ */
+static unsigned int bfin_get_vlev(unsigned int freq)
+{
+        int i;
+
+        if (!pdata)
+                goto err_out;
+
+        freq >>= 16;
+
+        for (i = 0; i < pdata->tabsize; i++)
+                if (freq <= (pdata->tuple_tab[i] & 0xFFFF))
+                        return pdata->tuple_tab[i] >> 16;
+
+err_out:
+        printk(KERN_WARNING "DPMC: No suitable CCLK VDDINT voltage pair found\n");
+        return VLEV_120;
+}
+
+#ifdef CONFIG_CPU_FREQ
+static int
+vreg_cpufreq_notifier(struct notifier_block *nb, unsigned long val, void *data)
+{
+        struct cpufreq_freqs *freq = data;
+
+        if (val == CPUFREQ_PRECHANGE && freq->old < freq->new) {
+                bfin_set_vlev(bfin_get_vlev(freq->new));
+                udelay(pdata->vr_settling_time); /* Wait until Volatge settled */
+
+        } else if (val == CPUFREQ_POSTCHANGE && freq->old > freq->new)
+                bfin_set_vlev(bfin_get_vlev(freq->new));
+
+        return 0;
+}
+
+static struct notifier_block vreg_cpufreq_notifier_block = {
+        .notifier_call  = vreg_cpufreq_notifier
+};
+#endif /* CONFIG_CPU_FREQ */
+
+/**
+ *      bfin_dpmc_probe -
+ *
+ */
+static int __devinit bfin_dpmc_probe(struct platform_device *pdev)
+{
+        if (pdev->dev.platform_data)
+                pdata = pdev->dev.platform_data;
+        else
+                return -EINVAL;
+
+        return cpufreq_register_notifier(&vreg_cpufreq_notifier_block,
+                                         CPUFREQ_TRANSITION_NOTIFIER);
+}
+
+/**
+ *      bfin_dpmc_remove -
+ */
+static int __devexit bfin_dpmc_remove(struct platform_device *pdev)
+{
+        pdata = NULL;
+        return cpufreq_unregister_notifier(&vreg_cpufreq_notifier_block,
+                                         CPUFREQ_TRANSITION_NOTIFIER);
+}
+
+struct platform_driver bfin_dpmc_device_driver = {
+        .probe   = bfin_dpmc_probe,
+        .remove  = __devexit_p(bfin_dpmc_remove),
+        .driver  = {
+                .name = DRIVER_NAME,
+        }
+};
+
+/**
+ *      bfin_dpmc_init - Init driver
+ */
+static int __init bfin_dpmc_init(void)
+{
+        return platform_driver_register(&bfin_dpmc_device_driver);
+}
+module_init(bfin_dpmc_init);
+
+/**
+ *      bfin_dpmc_exit - break down driver
+ */
+static void __exit bfin_dpmc_exit(void)
+{
+        platform_driver_unregister(&bfin_dpmc_device_driver);
+}
+module_exit(bfin_dpmc_exit);
+
+MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
+MODULE_DESCRIPTION("cpu power management driver for Blackfin");
+MODULE_LICENSE("GPL");
diff --git a/arch/blackfin/mach-common/dpmc.S b/arch/blackfin/mach-common/dpmc_modes.S
index 9d45aa3265b1..b7981d31c392 100644
--- a/arch/blackfin/mach-common/dpmc.S
+++ b/arch/blackfin/mach-common/dpmc_modes.S
@@ -1,30 +1,7 @@
 /*
- * File:         arch/blackfin/mach-common/dpmc.S
- * Based on:
- * Author:       LG Soft India
+ * Copyright 2004-2008 Analog Devices Inc.
  *
- * Created:      ?
- * Description:  Watchdog Timer APIs
- *
- * Modified:
- *               Copyright 2004-2006 Analog Devices Inc.
- *
- * Bugs:         Enter bugs at http://blackfin.uclinux.org/
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, see the file COPYING, or write
- * to the Free Software Foundation, Inc.,
- * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ * Licensed under the GPL-2 or later.
  */
 
 #include <linux/linkage.h>
diff --git a/include/asm-blackfin/dpmc.h b/include/asm-blackfin/dpmc.h
index 686cf83a5269..7f34cd384f12 100644
--- a/include/asm-blackfin/dpmc.h
+++ b/include/asm-blackfin/dpmc.h
@@ -1,7 +1,7 @@
 /*
  * include/asm-blackfin/dpmc.h -  Miscellaneous IOCTL commands for Dynamic Power
  *                              Management Controller Driver.
- * Copyright (C) 2004 Analog Device Inc.
+ * Copyright (C) 2004-2008 Analog Device Inc.
  *
  */
 #ifndef _BLACKFIN_DPMC_H_
@@ -65,6 +65,14 @@ void disable_wdog_timer(void);
 extern unsigned long get_cclk(void);
 extern unsigned long get_sclk(void);
 
+struct bfin_dpmc_platform_data {
+        const unsigned int *tuple_tab;
+        unsigned short tabsize;
+        unsigned short vr_settling_time; /* in us */
+};
+
+#define VRPAIR(vlev, freq) (((vlev) << 16) | ((freq) >> 16))
+
 #endif  /* __KERNEL__ */
 
 #endif  /*_BLACKFIN_DPMC_H_*/