Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm

* 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm: (257 commits)
  [ARM] Update mach-types
  ARM: 5636/1: Move vendor enum to AMBA include
  ARM: Fix pfn_valid() for sparse memory
  [ARM] orion5x: Add LaCie NAS 2Big Network support
  [ARM] pxa/sharpsl_pm: zaurus c3000 aka spitz: fix resume
  ARM: 5686/1: at91: Correct AC97 reset line in at91sam9263ek board
  ARM: 5640/1: This patch modifies the support of AC97 on the at91sam9263 ek board
  ARM: 5689/1: Update default config of HP Jornada 700-series machines
  ARM: 5691/1: fix cache aliasing issues between kmap() and kmap_atomic() with highmem
  ARM: 5688/1: ks8695_serial: disable_irq() lockup
  ARM: 5687/1: fix an oops with highmem
  ARM: 5684/1: Add nuc960 platform to w90x900
  ARM: 5683/1: Add nuc950 platform to w90x900
  ARM: 5682/1: Add cpu.c and dev.c and modify some files of w90p910 platform
  ARM: 5626/1: add suspend/resume functions to amba-pl011 serial driver
  ARM: 5625/1: fix hard coded 4K resource size in amba bus detection
  MMC: MMCI: convert realview MMC to use gpiolib
  ARM: 5685/1: Make MMCI driver compile without gpiolib
  ARM: implement highpte
  ARM: Show FIQ in /proc/interrupts on CONFIG_FIQ
  ...

Fix up trivial conflict in arch/arm/kernel/signal.c.

It was due to the TIF_NOTIFY_RESUME addition in commit d0420c83f ("KEYS:
Extend TIF_NOTIFY_RESUME to (almost) all architectures") and follow-ups.

11 files changed, 577 insertions, 90 deletions

diff --git a/arch/arm/plat-s3c/Kconfig b/arch/arm/plat-s3c/Kconfig
index 935c7558469b..8931c5f0e46b 100644
--- a/arch/arm/plat-s3c/Kconfig
+++ b/arch/arm/plat-s3c/Kconfig
@@ -198,4 +198,9 @@ config S3C_DEV_USB_HSOTG
         help
           Compile in platform device definition for USB high-speed OtG
 
+config S3C_DEV_NAND
+        bool
+        help
+          Compile in platform device definition for NAND controller
+
 endif
diff --git a/arch/arm/plat-s3c/Makefile b/arch/arm/plat-s3c/Makefile
index 0761766b1833..3c09109e9e84 100644
--- a/arch/arm/plat-s3c/Makefile
+++ b/arch/arm/plat-s3c/Makefile
@@ -28,13 +28,17 @@ obj-$(CONFIG_PM)		+= pm.o
 obj-$(CONFIG_PM)                += pm-gpio.o
 obj-$(CONFIG_S3C2410_PM_CHECK)  += pm-check.o
 
+# PWM support
+
+obj-$(CONFIG_HAVE_PWM)          += pwm.o
+
 # devices
 
 obj-$(CONFIG_S3C_DEV_HSMMC)     += dev-hsmmc.o
 obj-$(CONFIG_S3C_DEV_HSMMC1)    += dev-hsmmc1.o
 obj-y                           += dev-i2c0.o
 obj-$(CONFIG_S3C_DEV_I2C1)      += dev-i2c1.o
-obj-$(CONFIG_SND_S3C64XX_SOC_I2S)       += dev-audio.o
 obj-$(CONFIG_S3C_DEV_FB)        += dev-fb.o
 obj-$(CONFIG_S3C_DEV_USB_HOST)  += dev-usb.o
 obj-$(CONFIG_S3C_DEV_USB_HSOTG) += dev-usb-hsotg.o
+obj-$(CONFIG_S3C_DEV_NAND)      += dev-nand.o
diff --git a/arch/arm/plat-s3c/dev-audio.c b/arch/arm/plat-s3c/dev-audio.c
deleted file mode 100644
index 1322beb40dd7..000000000000
--- a/arch/arm/plat-s3c/dev-audio.c
+++ /dev/null
@@ -1,68 +0,0 @@
-/* linux/arch/arm/plat-s3c/dev-audio.c
- *
- * Copyright 2009 Wolfson Microelectronics
- *      Mark Brown <broonie@opensource.wolfsonmicro.com>
- *
-
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include <linux/kernel.h>
-#include <linux/string.h>
-#include <linux/platform_device.h>
-
-#include <mach/irqs.h>
-#include <mach/map.h>
-
-#include <plat/devs.h>
-
-
-static struct resource s3c64xx_iis0_resource[] = {
-        [0] = {
-                .start = S3C64XX_PA_IIS0,
-                .end   = S3C64XX_PA_IIS0 + 0x100 - 1,
-                .flags = IORESOURCE_MEM,
-        },
-};
-
-struct platform_device s3c64xx_device_iis0 = {
-        .name             = "s3c64xx-iis",
-        .id               = 0,
-        .num_resources    = ARRAY_SIZE(s3c64xx_iis0_resource),
-        .resource         = s3c64xx_iis0_resource,
-};
-EXPORT_SYMBOL(s3c64xx_device_iis0);
-
-static struct resource s3c64xx_iis1_resource[] = {
-        [0] = {
-                .start = S3C64XX_PA_IIS1,
-                .end   = S3C64XX_PA_IIS1 + 0x100 - 1,
-                .flags = IORESOURCE_MEM,
-        },
-};
-
-struct platform_device s3c64xx_device_iis1 = {
-        .name             = "s3c64xx-iis",
-        .id               = 1,
-        .num_resources    = ARRAY_SIZE(s3c64xx_iis1_resource),
-        .resource         = s3c64xx_iis1_resource,
-};
-EXPORT_SYMBOL(s3c64xx_device_iis1);
-
-static struct resource s3c64xx_iisv4_resource[] = {
-        [0] = {
-                .start = S3C64XX_PA_IISV4,
-                .end   = S3C64XX_PA_IISV4 + 0x100 - 1,
-                .flags = IORESOURCE_MEM,
-        },
-};
-
-struct platform_device s3c64xx_device_iisv4 = {
-        .name             = "s3c64xx-iis-v4",
-        .id               = -1,
-        .num_resources    = ARRAY_SIZE(s3c64xx_iisv4_resource),
-        .resource         = s3c64xx_iisv4_resource,
-};
-EXPORT_SYMBOL(s3c64xx_device_iisv4);
diff --git a/arch/arm/plat-s3c/dev-nand.c b/arch/arm/plat-s3c/dev-nand.c
new file mode 100644
index 000000000000..4e5323732434
--- /dev/null
+++ b/arch/arm/plat-s3c/dev-nand.c
@@ -0,0 +1,30 @@
+/*
+ * S3C series device definition for nand device
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+
+#include <mach/map.h>
+#include <plat/devs.h>
+
+static struct resource s3c_nand_resource[] = {
+        [0] = {
+                .start = S3C_PA_NAND,
+                .end   = S3C_PA_NAND + SZ_1M,
+                .flags = IORESOURCE_MEM,
+        }
+};
+
+struct platform_device s3c_device_nand = {
+        .name             = "s3c2410-nand",
+        .id               = -1,
+        .num_resources    = ARRAY_SIZE(s3c_nand_resource),
+        .resource         = s3c_nand_resource,
+};
+
+EXPORT_SYMBOL(s3c_device_nand);
diff --git a/arch/arm/plat-s3c/include/plat/adc.h b/arch/arm/plat-s3c/include/plat/adc.h
index d847bd476b6c..5f3b1cd53b90 100644
--- a/arch/arm/plat-s3c/include/plat/adc.h
+++ b/arch/arm/plat-s3c/include/plat/adc.h
@@ -19,10 +19,14 @@ struct s3c_adc_client;
 extern int s3c_adc_start(struct s3c_adc_client *client,
                          unsigned int channel, unsigned int nr_samples);
 
+extern int s3c_adc_read(struct s3c_adc_client *client, unsigned int ch);
+
 extern struct s3c_adc_client *
         s3c_adc_register(struct platform_device *pdev,
-                         void (*select)(unsigned selected),
-                         void (*conv)(unsigned d0, unsigned d1,
+                         void (*select)(struct s3c_adc_client *client,
+                                        unsigned selected),
+                         void (*conv)(struct s3c_adc_client *client,
+                                      unsigned d0, unsigned d1,
                                       unsigned *samples_left),
                          unsigned int is_ts);
 
diff --git a/arch/arm/plat-s3c/include/plat/cpu-freq.h b/arch/arm/plat-s3c/include/plat/cpu-freq.h
index c86a13307e90..7b982b7f28cd 100644
--- a/arch/arm/plat-s3c/include/plat/cpu-freq.h
+++ b/arch/arm/plat-s3c/include/plat/cpu-freq.h
@@ -17,6 +17,21 @@ struct s3c_cpufreq_info;
 struct s3c_cpufreq_board;
 struct s3c_iotimings;
 
+/**
+ * struct s3c_freq - frequency information (mainly for core drivers)
+ * @fclk: The FCLK frequency in Hz.
+ * @armclk: The ARMCLK frequency in Hz.
+ * @hclk_tns: HCLK cycle time in 10ths of nano-seconds.
+ * @hclk: The HCLK frequency in Hz.
+ * @pclk: The PCLK frequency in Hz.
+ *
+ * This contains the frequency information about the current configuration
+ * mainly for the core drivers to ensure we do not end up passing about
+ * a large number of parameters.
+ *
+ * The @hclk_tns field is a useful cache for the parts of the drivers that
+ * need to calculate IO timings and suchlike.
+ */
 struct s3c_freq {
         unsigned long   fclk;
         unsigned long   armclk;
@@ -25,48 +40,84 @@ struct s3c_freq {
         unsigned long   pclk;
 };
 
-/* wrapper 'struct cpufreq_freqs' so that any drivers receiving the
+/**
+ * struct s3c_cpufreq_freqs - s3c cpufreq notification information.
+ * @freqs: The cpufreq setting information.
+ * @old: The old clock settings.
+ * @new: The new clock settings.
+ * @pll_changing: Set if the PLL is changing.
+ *
+ * Wrapper 'struct cpufreq_freqs' so that any drivers receiving the
  * notification can use this information that is not provided by just
  * having the core frequency alone.
+ *
+ * The pll_changing flag is used to indicate if the PLL itself is
+ * being set during this change. This is important as the clocks
+ * will temporarily be set to the XTAL clock during this time, so
+ * drivers may want to close down their output during this time.
+ *
+ * Note, this is not being used by any current drivers and therefore
+ * may be removed in the future.
  */
-
 struct s3c_cpufreq_freqs {
         struct cpufreq_freqs    freqs;
         struct s3c_freq         old;
         struct s3c_freq         new;
+
+        unsigned int            pll_changing:1;
 };
 
 #define to_s3c_cpufreq(_cf) container_of(_cf, struct s3c_cpufreq_freqs, freqs)
 
+/**
+ * struct s3c_clkdivs - clock divisor information
+ * @p_divisor: Divisor from FCLK to PCLK.
+ * @h_divisor: Divisor from FCLK to HCLK.
+ * @arm_divisor: Divisor from FCLK to ARMCLK (not all CPUs).
+ * @dvs: Non-zero if using DVS mode for ARMCLK.
+ *
+ * Divisor settings for the core clocks.
+ */
 struct s3c_clkdivs {
-        int             p_divisor;      /* fclk / pclk */
-        int             h_divisor;      /* fclk / hclk */
-        int             arm_divisor;    /* not all cpus have this. */
-        unsigned char   dvs;            /* using dvs mode to arm. */
+        int             p_divisor;
+        int             h_divisor;
+        int             arm_divisor;
+        unsigned char   dvs;
 };
 
 #define PLLVAL(_m, _p, _s) (((_m) << 12) | ((_p) << 4) | (_s))
 
+/**
+ * struct s3c_pllval - PLL value entry.
+ * @freq: The frequency for this entry in Hz.
+ * @pll_reg: The PLL register setting for this PLL value.
+ */
 struct s3c_pllval {
         unsigned long           freq;
         unsigned long           pll_reg;
 };
 
-struct s3c_cpufreq_config {
-        struct s3c_freq         freq;
-        struct s3c_pllval       pll;
-        struct s3c_clkdivs      divs;
-        struct s3c_cpufreq_info *info;  /* for core, not drivers */
-        struct s3c_cpufreq_board *board;
-};
-
-/* s3c_cpufreq_board
+/**
+ * struct s3c_cpufreq_board - per-board cpu frequency informatin
+ * @refresh: The SDRAM refresh period in nanoseconds.
+ * @auto_io: Set if the IO timing settings should be generated from the
+ *      initialisation time hardware registers.
+ * @need_io: Set if the board has external IO on any of the chipselect
+ *      lines that will require the hardware timing registers to be
+ *      updated on a clock change.
+ * @max: The maxium frequency limits for the system. Any field that
+ *      is left at zero will use the CPU's settings.
+ *
+ * This contains the board specific settings that affect how the CPU
+ * drivers chose settings. These include the memory refresh and IO
+ * timing information.
  *
- * per-board configuraton information, such as memory refresh and
- * how to initialise IO timings.
+ * Registration depends on the driver being used, the ARMCLK only
+ * implementation does not currently need this but the older style
+ * driver requires this to be available.
  */
 struct s3c_cpufreq_board {
-        unsigned int    refresh;        /* refresh period in ns */
+        unsigned int    refresh;
         unsigned int    auto_io:1;      /* automatically init io timings. */
         unsigned int    need_io:1;      /* set if needs io timing support. */
 
diff --git a/arch/arm/plat-s3c/include/plat/cpu.h b/arch/arm/plat-s3c/include/plat/cpu.h
index be541cbba070..fbc3d498e02e 100644
--- a/arch/arm/plat-s3c/include/plat/cpu.h
+++ b/arch/arm/plat-s3c/include/plat/cpu.h
@@ -65,6 +65,7 @@ extern struct sys_timer s3c24xx_timer;
 /* system device classes */
 
 extern struct sysdev_class s3c2410_sysclass;
+extern struct sysdev_class s3c2410a_sysclass;
 extern struct sysdev_class s3c2412_sysclass;
 extern struct sysdev_class s3c2440_sysclass;
 extern struct sysdev_class s3c2442_sysclass;
diff --git a/arch/arm/plat-s3c/include/plat/devs.h b/arch/arm/plat-s3c/include/plat/devs.h
index 2e170827e0b0..0f540ea1e999 100644
--- a/arch/arm/plat-s3c/include/plat/devs.h
+++ b/arch/arm/plat-s3c/include/plat/devs.h
@@ -46,6 +46,8 @@ extern struct platform_device s3c_device_hsmmc2;
 extern struct platform_device s3c_device_spi0;
 extern struct platform_device s3c_device_spi1;
 
+extern struct platform_device s3c_device_hwmon;
+
 extern struct platform_device s3c_device_nand;
 
 extern struct platform_device s3c_device_usbgadget;
@@ -56,5 +58,6 @@ extern struct platform_device s3c_device_usb_hsotg;
 #ifdef CONFIG_CPU_S3C2440
 
 extern struct platform_device s3c_device_camif;
+extern struct platform_device s3c_device_ac97;
 
 #endif
diff --git a/arch/arm/plat-s3c/include/plat/hwmon.h b/arch/arm/plat-s3c/include/plat/hwmon.h
new file mode 100644
index 000000000000..1ba88ea0aa31
--- /dev/null
+++ b/arch/arm/plat-s3c/include/plat/hwmon.h
@@ -0,0 +1,41 @@
+/* linux/arch/arm/plat-s3c/include/plat/hwmon.h
+ *
+ * Copyright 2005 Simtec Electronics
+ *      Ben Dooks <ben@simtec.co.uk>
+ *      http://armlinux.simtec.co.uk/
+ *
+ * S3C - HWMon interface for ADC
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#ifndef __ASM_ARCH_ADC_HWMON_H
+#define __ASM_ARCH_ADC_HWMON_H __FILE__
+
+/**
+ * s3c_hwmon_chcfg - channel configuration
+ * @name: The name to give this channel.
+ * @mult: Multiply the ADC value read by this.
+ * @div: Divide the value from the ADC by this.
+ *
+ * The value read from the ADC is converted to a value that
+ * hwmon expects (mV) by result = (value_read * @mult) / @div.
+ */
+struct s3c_hwmon_chcfg {
+        const char      *name;
+        unsigned int    mult;
+        unsigned int    div;
+};
+
+/**
+ * s3c_hwmon_pdata - HWMON platform data
+ * @in: One configuration for each possible channel used.
+ */
+struct s3c_hwmon_pdata {
+        struct s3c_hwmon_chcfg  *in[8];
+};
+
+#endif /* __ASM_ARCH_ADC_HWMON_H */
+
diff --git a/arch/arm/plat-s3c/include/plat/map-base.h b/arch/arm/plat-s3c/include/plat/map-base.h
index b84289d32a54..250be311c85b 100644
--- a/arch/arm/plat-s3c/include/plat/map-base.h
+++ b/arch/arm/plat-s3c/include/plat/map-base.h
@@ -32,9 +32,15 @@
 
 #define S3C_VA_IRQ      S3C_ADDR(0x00000000)    /* irq controller(s) */
 #define S3C_VA_SYS      S3C_ADDR(0x00100000)    /* system control */
-#define S3C_VA_MEM      S3C_ADDR(0x00200000)    /* system control */
+#define S3C_VA_MEM      S3C_ADDR(0x00200000)    /* memory control */
 #define S3C_VA_TIMER    S3C_ADDR(0x00300000)    /* timer block */
 #define S3C_VA_WATCHDOG S3C_ADDR(0x00400000)    /* watchdog */
 #define S3C_VA_UART     S3C_ADDR(0x01000000)    /* UART */
 
+/* This is used for the CPU specific mappings that may be needed, so that
+ * they do not need to directly used S3C_ADDR() and thus make it easier to
+ * modify the space for mapping.
+ */
+#define S3C_ADDR_CPU(x) S3C_ADDR(0x00500000 + (x))
+
 #endif /* __ASM_PLAT_MAP_H */
diff --git a/arch/arm/plat-s3c/pwm.c b/arch/arm/plat-s3c/pwm.c
new file mode 100644
index 000000000000..4fdc5b307fd2
--- /dev/null
+++ b/arch/arm/plat-s3c/pwm.c
@@ -0,0 +1,410 @@
+/* arch/arm/plat-s3c/pwm.c
+ *
+ * Copyright (c) 2007 Ben Dooks
+ * Copyright (c) 2008 Simtec Electronics
+ *      Ben Dooks <ben@simtec.co.uk>, <ben-linux@fluff.org>
+ *
+ * S3C series PWM device core
+ *
+ * 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.
+*/
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/err.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/pwm.h>
+
+#include <mach/irqs.h>
+#include <mach/map.h>
+
+#include <plat/devs.h>
+#include <plat/regs-timer.h>
+
+struct pwm_device {
+        struct list_head         list;
+        struct platform_device  *pdev;
+
+        struct clk              *clk_div;
+        struct clk              *clk;
+        const char              *label;
+
+        unsigned int             period_ns;
+        unsigned int             duty_ns;
+
+        unsigned char            tcon_base;
+        unsigned char            running;
+        unsigned char            use_count;
+        unsigned char            pwm_id;
+};
+
+#define pwm_dbg(_pwm, msg...) dev_dbg(&(_pwm)->pdev->dev, msg)
+
+static struct clk *clk_scaler[2];
+
+/* Standard setup for a timer block. */
+
+#define TIMER_RESOURCE_SIZE (1)
+
+#define TIMER_RESOURCE(_tmr, _irq)                      \
+        (struct resource [TIMER_RESOURCE_SIZE]) {       \
+                [0] = {                                 \
+                        .start  = _irq,                 \
+                        .end    = _irq,                 \
+                        .flags  = IORESOURCE_IRQ        \
+                }                                       \
+        }
+
+#define DEFINE_S3C_TIMER(_tmr_no, _irq)                 \
+        .name           = "s3c24xx-pwm",                \
+        .id             = _tmr_no,                      \
+        .num_resources  = TIMER_RESOURCE_SIZE,          \
+        .resource       = TIMER_RESOURCE(_tmr_no, _irq),        \
+
+/* since we already have an static mapping for the timer, we do not
+ * bother setting any IO resource for the base.
+ */
+
+struct platform_device s3c_device_timer[] = {
+        [0] = { DEFINE_S3C_TIMER(0, IRQ_TIMER0) },
+        [1] = { DEFINE_S3C_TIMER(1, IRQ_TIMER1) },
+        [2] = { DEFINE_S3C_TIMER(2, IRQ_TIMER2) },
+        [3] = { DEFINE_S3C_TIMER(3, IRQ_TIMER3) },
+        [4] = { DEFINE_S3C_TIMER(4, IRQ_TIMER4) },
+};
+
+static inline int pwm_is_tdiv(struct pwm_device *pwm)
+{
+        return clk_get_parent(pwm->clk) == pwm->clk_div;
+}
+
+static DEFINE_MUTEX(pwm_lock);
+static LIST_HEAD(pwm_list);
+
+struct pwm_device *pwm_request(int pwm_id, const char *label)
+{
+        struct pwm_device *pwm;
+        int found = 0;
+
+        mutex_lock(&pwm_lock);
+
+        list_for_each_entry(pwm, &pwm_list, list) {
+                if (pwm->pwm_id == pwm_id) {
+                        found = 1;
+                        break;
+                }
+        }
+
+        if (found) {
+                if (pwm->use_count == 0) {
+                        pwm->use_count = 1;
+                        pwm->label = label;
+                } else
+                        pwm = ERR_PTR(-EBUSY);
+        } else
+                pwm = ERR_PTR(-ENOENT);
+
+        mutex_unlock(&pwm_lock);
+        return pwm;
+}
+
+EXPORT_SYMBOL(pwm_request);
+
+
+void pwm_free(struct pwm_device *pwm)
+{
+        mutex_lock(&pwm_lock);
+
+        if (pwm->use_count) {
+                pwm->use_count--;
+                pwm->label = NULL;
+        } else
+                printk(KERN_ERR "PWM%d device already freed\n", pwm->pwm_id);
+
+        mutex_unlock(&pwm_lock);
+}
+
+EXPORT_SYMBOL(pwm_free);
+
+#define pwm_tcon_start(pwm) (1 << (pwm->tcon_base + 0))
+#define pwm_tcon_invert(pwm) (1 << (pwm->tcon_base + 2))
+#define pwm_tcon_autoreload(pwm) (1 << (pwm->tcon_base + 3))
+#define pwm_tcon_manulupdate(pwm) (1 << (pwm->tcon_base + 1))
+
+int pwm_enable(struct pwm_device *pwm)
+{
+        unsigned long flags;
+        unsigned long tcon;
+
+        local_irq_save(flags);
+
+        tcon = __raw_readl(S3C2410_TCON);
+        tcon |= pwm_tcon_start(pwm);
+        __raw_writel(tcon, S3C2410_TCON);
+
+        local_irq_restore(flags);
+
+        pwm->running = 1;
+        return 0;
+}
+
+EXPORT_SYMBOL(pwm_enable);
+
+void pwm_disable(struct pwm_device *pwm)
+{
+        unsigned long flags;
+        unsigned long tcon;
+
+        local_irq_save(flags);
+
+        tcon = __raw_readl(S3C2410_TCON);
+        tcon &= ~pwm_tcon_start(pwm);
+        __raw_writel(tcon, S3C2410_TCON);
+
+        local_irq_restore(flags);
+
+        pwm->running = 0;
+}
+
+EXPORT_SYMBOL(pwm_disable);
+
+static unsigned long pwm_calc_tin(struct pwm_device *pwm, unsigned long freq)
+{
+        unsigned long tin_parent_rate;
+        unsigned int div;
+
+        tin_parent_rate = clk_get_rate(clk_get_parent(pwm->clk_div));
+        pwm_dbg(pwm, "tin parent at %lu\n", tin_parent_rate);
+
+        for (div = 2; div <= 16; div *= 2) {
+                if ((tin_parent_rate / (div << 16)) < freq)
+                        return tin_parent_rate / div;
+        }
+
+        return tin_parent_rate / 16;
+}
+
+#define NS_IN_HZ (1000000000UL)
+
+int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
+{
+        unsigned long tin_rate;
+        unsigned long tin_ns;
+        unsigned long period;
+        unsigned long flags;
+        unsigned long tcon;
+        unsigned long tcnt;
+        long tcmp;
+
+        /* We currently avoid using 64bit arithmetic by using the
+         * fact that anything faster than 1Hz is easily representable
+         * by 32bits. */
+
+        if (period_ns > NS_IN_HZ || duty_ns > NS_IN_HZ)
+                return -ERANGE;
+
+        if (duty_ns > period_ns)
+                return -EINVAL;
+
+        if (period_ns == pwm->period_ns &&
+            duty_ns == pwm->duty_ns)
+                return 0;
+
+        /* The TCMP and TCNT can be read without a lock, they're not
+         * shared between the timers. */
+
+        tcmp = __raw_readl(S3C2410_TCMPB(pwm->pwm_id));
+        tcnt = __raw_readl(S3C2410_TCNTB(pwm->pwm_id));
+
+        period = NS_IN_HZ / period_ns;
+
+        pwm_dbg(pwm, "duty_ns=%d, period_ns=%d (%lu)\n",
+                duty_ns, period_ns, period);
+
+        /* Check to see if we are changing the clock rate of the PWM */
+
+        if (pwm->period_ns != period_ns) {
+                if (pwm_is_tdiv(pwm)) {
+                        tin_rate = pwm_calc_tin(pwm, period);
+                        clk_set_rate(pwm->clk_div, tin_rate);
+                } else
+                        tin_rate = clk_get_rate(pwm->clk);
+
+                pwm->period_ns = period_ns;
+
+                pwm_dbg(pwm, "tin_rate=%lu\n", tin_rate);
+
+                tin_ns = NS_IN_HZ / tin_rate;
+                tcnt = period_ns / tin_ns;
+        } else
+                tin_ns = NS_IN_HZ / clk_get_rate(pwm->clk);
+
+        /* Note, counters count down */
+
+        tcmp = duty_ns / tin_ns;
+        tcmp = tcnt - tcmp;
+        /* the pwm hw only checks the compare register after a decrement,
+           so the pin never toggles if tcmp = tcnt */
+        if (tcmp == tcnt)
+                tcmp--;
+
+        pwm_dbg(pwm, "tin_ns=%lu, tcmp=%ld/%lu\n", tin_ns, tcmp, tcnt);
+
+        if (tcmp < 0)
+                tcmp = 0;
+
+        /* Update the PWM register block. */
+
+        local_irq_save(flags);
+
+        __raw_writel(tcmp, S3C2410_TCMPB(pwm->pwm_id));
+        __raw_writel(tcnt, S3C2410_TCNTB(pwm->pwm_id));
+
+        tcon = __raw_readl(S3C2410_TCON);
+        tcon |= pwm_tcon_manulupdate(pwm);
+        tcon |= pwm_tcon_autoreload(pwm);
+        __raw_writel(tcon, S3C2410_TCON);
+
+        tcon &= ~pwm_tcon_manulupdate(pwm);
+        __raw_writel(tcon, S3C2410_TCON);
+
+        local_irq_restore(flags);
+
+        return 0;
+}
+
+EXPORT_SYMBOL(pwm_config);
+
+static int pwm_register(struct pwm_device *pwm)
+{
+        pwm->duty_ns = -1;
+        pwm->period_ns = -1;
+
+        mutex_lock(&pwm_lock);
+        list_add_tail(&pwm->list, &pwm_list);
+        mutex_unlock(&pwm_lock);
+
+        return 0;
+}
+
+static int s3c_pwm_probe(struct platform_device *pdev)
+{
+        struct device *dev = &pdev->dev;
+        struct pwm_device *pwm;
+        unsigned long flags;
+        unsigned long tcon;
+        unsigned int id = pdev->id;
+        int ret;
+
+        if (id == 4) {
+                dev_err(dev, "TIMER4 is currently not supported\n");
+                return -ENXIO;
+        }
+
+        pwm = kzalloc(sizeof(struct pwm_device), GFP_KERNEL);
+        if (pwm == NULL) {
+                dev_err(dev, "failed to allocate pwm_device\n");
+                return -ENOMEM;
+        }
+
+        pwm->pdev = pdev;
+        pwm->pwm_id = id;
+
+        /* calculate base of control bits in TCON */
+        pwm->tcon_base = id == 0 ? 0 : (id * 4) + 4;
+
+        pwm->clk = clk_get(dev, "pwm-tin");
+        if (IS_ERR(pwm->clk)) {
+                dev_err(dev, "failed to get pwm tin clk\n");
+                ret = PTR_ERR(pwm->clk);
+                goto err_alloc;
+        }
+
+        pwm->clk_div = clk_get(dev, "pwm-tdiv");
+        if (IS_ERR(pwm->clk_div)) {
+                dev_err(dev, "failed to get pwm tdiv clk\n");
+                ret = PTR_ERR(pwm->clk_div);
+                goto err_clk_tin;
+        }
+
+        local_irq_save(flags);
+
+        tcon = __raw_readl(S3C2410_TCON);
+        tcon |= pwm_tcon_invert(pwm);
+        __raw_writel(tcon, S3C2410_TCON);
+
+        local_irq_restore(flags);
+
+
+        ret = pwm_register(pwm);
+        if (ret) {
+                dev_err(dev, "failed to register pwm\n");
+                goto err_clk_tdiv;
+        }
+
+        pwm_dbg(pwm, "config bits %02x\n",
+                (__raw_readl(S3C2410_TCON) >> pwm->tcon_base) & 0x0f);
+
+        dev_info(dev, "tin at %lu, tdiv at %lu, tin=%sclk, base %d\n",
+                 clk_get_rate(pwm->clk),
+                 clk_get_rate(pwm->clk_div),
+                 pwm_is_tdiv(pwm) ? "div" : "ext", pwm->tcon_base);
+
+        platform_set_drvdata(pdev, pwm);
+        return 0;
+
+ err_clk_tdiv:
+        clk_put(pwm->clk_div);
+
+ err_clk_tin:
+        clk_put(pwm->clk);
+
+ err_alloc:
+        kfree(pwm);
+        return ret;
+}
+
+static int s3c_pwm_remove(struct platform_device *pdev)
+{
+        struct pwm_device *pwm = platform_get_drvdata(pdev);
+
+        clk_put(pwm->clk_div);
+        clk_put(pwm->clk);
+        kfree(pwm);
+
+        return 0;
+}
+
+static struct platform_driver s3c_pwm_driver = {
+        .driver         = {
+                .name   = "s3c24xx-pwm",
+                .owner  = THIS_MODULE,
+        },
+        .probe          = s3c_pwm_probe,
+        .remove         = __devexit_p(s3c_pwm_remove),
+};
+
+static int __init pwm_init(void)
+{
+        int ret;
+
+        clk_scaler[0] = clk_get(NULL, "pwm-scaler0");
+        clk_scaler[1] = clk_get(NULL, "pwm-scaler1");
+
+        if (IS_ERR(clk_scaler[0]) || IS_ERR(clk_scaler[1])) {
+                printk(KERN_ERR "%s: failed to get scaler clocks\n", __func__);
+                return -EINVAL;
+        }
+
+        ret = platform_driver_register(&s3c_pwm_driver);
+        if (ret)
+                printk(KERN_ERR "%s: failed to add pwm driver\n", __func__);
+
+        return ret;
+}
+
+arch_initcall(pwm_init);