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authorRussell King <rmk@dyn-67.arm.linux.org.uk>2009-09-12 15:02:26 +0400
committerRussell King <rmk+kernel@arm.linux.org.uk>2009-09-12 15:02:26 +0400
commitddd559b13f6d2fe3ad68c4b3f5235fd3c2eae4e3 (patch)
treed827bca3fc825a0ac33efbcd493713be40fcc812 /arch/arm/plat-s3c
parentcf7a2b4fb6a9b86779930a0a123b0df41aa9208f (diff)
parentf17a1f06d2fa93f4825be572622eb02c4894db4e (diff)
downloadlinux-ddd559b13f6d2fe3ad68c4b3f5235fd3c2eae4e3.tar.xz
Merge branch 'devel-stable' into devel
Conflicts: MAINTAINERS arch/arm/mm/fault.c
Diffstat (limited to 'arch/arm/plat-s3c')
-rw-r--r--arch/arm/plat-s3c/Kconfig5
-rw-r--r--arch/arm/plat-s3c/Makefile6
-rw-r--r--arch/arm/plat-s3c/dev-audio.c68
-rw-r--r--arch/arm/plat-s3c/dev-nand.c30
-rw-r--r--arch/arm/plat-s3c/include/plat/adc.h8
-rw-r--r--arch/arm/plat-s3c/include/plat/cpu-freq.h87
-rw-r--r--arch/arm/plat-s3c/include/plat/cpu.h1
-rw-r--r--arch/arm/plat-s3c/include/plat/devs.h3
-rw-r--r--arch/arm/plat-s3c/include/plat/hwmon.h41
-rw-r--r--arch/arm/plat-s3c/include/plat/map-base.h8
-rw-r--r--arch/arm/plat-s3c/pwm.c406
11 files changed, 573 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..f3d37ac5595b
--- /dev/null
+++ b/arch/arm/plat-s3c/pwm.c
@@ -0,0 +1,406 @@
+/* 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;
+
+ 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);