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-rw-r--r--Documentation/devicetree/bindings/pwm/pwm-samsung.txt43
-rw-r--r--arch/arm/boot/dts/Makefile1
-rw-r--r--arch/arm/boot/dts/exynos4.dtsi8
-rw-r--r--arch/arm/boot/dts/exynos4210-universal_c210.dts352
-rw-r--r--arch/arm/mach-exynos/common.c15
-rw-r--r--arch/arm/plat-samsung/Kconfig4
-rw-r--r--drivers/clocksource/Kconfig9
-rw-r--r--drivers/clocksource/Makefile1
-rw-r--r--drivers/clocksource/samsung_pwm_timer.c494
-rw-r--r--include/clocksource/samsung_pwm.h36
10 files changed, 946 insertions, 17 deletions
diff --git a/Documentation/devicetree/bindings/pwm/pwm-samsung.txt b/Documentation/devicetree/bindings/pwm/pwm-samsung.txt
new file mode 100644
index 000000000000..ac67c687a327
--- /dev/null
+++ b/Documentation/devicetree/bindings/pwm/pwm-samsung.txt
@@ -0,0 +1,43 @@
+* Samsung PWM timers
+
+Samsung SoCs contain PWM timer blocks which can be used for system clock source
+and clock event timers, as well as to drive SoC outputs with PWM signal. Each
+PWM timer block provides 5 PWM channels (not all of them can drive physical
+outputs - see SoC and board manual).
+
+Be aware that the clocksource driver supports only uniprocessor systems.
+
+Required properties:
+- compatible : should be one of following:
+ samsung,s3c2410-pwm - for 16-bit timers present on S3C24xx SoCs
+ samsung,s3c6400-pwm - for 32-bit timers present on S3C64xx SoCs
+ samsung,s5p6440-pwm - for 32-bit timers present on S5P64x0 SoCs
+ samsung,s5pc100-pwm - for 32-bit timers present on S5PC100, S5PV210,
+ Exynos4210 rev0 SoCs
+ samsung,exynos4210-pwm - for 32-bit timers present on Exynos4210,
+ Exynos4x12 and Exynos5250 SoCs
+- reg: base address and size of register area
+- interrupts: list of timer interrupts (one interrupt per timer, starting at
+ timer 0)
+- #pwm-cells: number of cells used for PWM specifier - must be 3
+ the specifier format is as follows:
+ - phandle to PWM controller node
+ - index of PWM channel (from 0 to 4)
+ - PWM signal period in nanoseconds
+ - bitmask of optional PWM flags:
+ 0x1 - invert PWM signal
+
+Optional properties:
+- samsung,pwm-outputs: list of PWM channels used as PWM outputs on particular
+ platform - an array of up to 5 elements being indices of PWM channels
+ (from 0 to 4), the order does not matter.
+
+Example:
+ pwm@7f006000 {
+ compatible = "samsung,s3c6400-pwm";
+ reg = <0x7f006000 0x1000>;
+ interrupt-parent = <&vic0>;
+ interrupts = <23>, <24>, <25>, <27>, <28>;
+ samsung,pwm-outputs = <0>, <1>;
+ #pwm-cells = <3>;
+ }
diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
index d3cd880d70b3..2d870f4e4e2b 100644
--- a/arch/arm/boot/dts/Makefile
+++ b/arch/arm/boot/dts/Makefile
@@ -42,6 +42,7 @@ dtb-$(CONFIG_ARCH_DOVE) += dove-cm-a510.dtb \
dtb-$(CONFIG_ARCH_EXYNOS) += exynos4210-origen.dtb \
exynos4210-smdkv310.dtb \
exynos4210-trats.dtb \
+ exynos4210-universal_c210.dtb \
exynos4412-odroidx.dtb \
exynos4412-smdk4412.dtb \
exynos4412-origen.dtb \
diff --git a/arch/arm/boot/dts/exynos4.dtsi b/arch/arm/boot/dts/exynos4.dtsi
index 9ac47d51c407..b620e34fbd92 100644
--- a/arch/arm/boot/dts/exynos4.dtsi
+++ b/arch/arm/boot/dts/exynos4.dtsi
@@ -316,6 +316,14 @@
status = "disabled";
};
+ pwm@139D0000 {
+ compatible = "samsung,exynos4210-pwm";
+ reg = <0x139D0000 0x1000>;
+ interrupts = <0 37 0>, <0 38 0>, <0 39 0>, <0 40 0>, <0 41 0>;
+ #pwm-cells = <2>;
+ status = "disabled";
+ };
+
amba {
#address-cells = <1>;
#size-cells = <1>;
diff --git a/arch/arm/boot/dts/exynos4210-universal_c210.dts b/arch/arm/boot/dts/exynos4210-universal_c210.dts
new file mode 100644
index 000000000000..345cdb51dcb7
--- /dev/null
+++ b/arch/arm/boot/dts/exynos4210-universal_c210.dts
@@ -0,0 +1,352 @@
+/*
+ * Samsung's Exynos4210 based Universal C210 board device tree source
+ *
+ * Copyright (c) 2012-2013 Samsung Electronics Co., Ltd.
+ * http://www.samsung.com
+ *
+ * Device tree source file for Samsung's Universal C210 board which is based on
+ * Samsung's Exynos4210 rev0 SoC.
+ *
+ * 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.
+*/
+
+/dts-v1/;
+/include/ "exynos4210.dtsi"
+
+/ {
+ model = "Samsung Universal C210 based on Exynos4210 rev0";
+ compatible = "samsung,universal_c210", "samsung,exynos4210";
+
+ memory {
+ reg = <0x40000000 0x10000000
+ 0x50000000 0x10000000>;
+ };
+
+ chosen {
+ bootargs = "console=ttySAC2,115200N8 root=/dev/mmcblk0p5 rw rootwait earlyprintk panic=5 maxcpus=1";
+ };
+
+ mct@10050000 {
+ compatible = "none";
+ };
+
+ fixed-rate-clocks {
+ xxti {
+ compatible = "samsung,clock-xxti";
+ clock-frequency = <0>;
+ };
+
+ xusbxti {
+ compatible = "samsung,clock-xusbxti";
+ clock-frequency = <24000000>;
+ };
+ };
+
+ vemmc_reg: voltage-regulator {
+ compatible = "regulator-fixed";
+ regulator-name = "VMEM_VDD_2_8V";
+ regulator-min-microvolt = <2800000>;
+ regulator-max-microvolt = <2800000>;
+ gpio = <&gpe1 3 0>;
+ enable-active-high;
+ };
+
+ sdhci_emmc: sdhci@12510000 {
+ bus-width = <8>;
+ non-removable;
+ pinctrl-0 = <&sd0_clk &sd0_cmd &sd0_bus8>;
+ pinctrl-names = "default";
+ vmmc-supply = <&vemmc_reg>;
+ status = "okay";
+ };
+
+ serial@13800000 {
+ status = "okay";
+ };
+
+ serial@13810000 {
+ status = "okay";
+ };
+
+ serial@13820000 {
+ status = "okay";
+ };
+
+ serial@13830000 {
+ status = "okay";
+ };
+
+ gpio-keys {
+ compatible = "gpio-keys";
+
+ vol-up-key {
+ gpios = <&gpx2 0 1>;
+ linux,code = <115>;
+ label = "volume up";
+ debounce-interval = <1>;
+ };
+
+ vol-down-key {
+ gpios = <&gpx2 1 1>;
+ linux,code = <114>;
+ label = "volume down";
+ debounce-interval = <1>;
+ };
+
+ config-key {
+ gpios = <&gpx2 2 1>;
+ linux,code = <171>;
+ label = "config";
+ debounce-interval = <1>;
+ gpio-key,wakeup;
+ };
+
+ camera-key {
+ gpios = <&gpx2 3 1>;
+ linux,code = <212>;
+ label = "camera";
+ debounce-interval = <1>;
+ };
+
+ power-key {
+ gpios = <&gpx2 7 1>;
+ linux,code = <116>;
+ label = "power";
+ debounce-interval = <1>;
+ gpio-key,wakeup;
+ };
+
+ ok-key {
+ gpios = <&gpx3 5 1>;
+ linux,code = <352>;
+ label = "ok";
+ debounce-interval = <1>;
+ };
+ };
+
+ tsp_reg: voltage-regulator {
+ compatible = "regulator-fixed";
+ regulator-name = "TSP_2_8V";
+ regulator-min-microvolt = <2800000>;
+ regulator-max-microvolt = <2800000>;
+ gpio = <&gpe2 3 0>;
+ enable-active-high;
+ };
+
+ i2c@13890000 {
+ samsung,i2c-sda-delay = <100>;
+ samsung,i2c-slave-addr = <0x10>;
+ samsung,i2c-max-bus-freq = <100000>;
+ pinctrl-0 = <&i2c3_bus>;
+ pinctrl-names = "default";
+ status = "okay";
+
+ tsp@4a {
+ /* TBD: Atmel maXtouch touchscreen */
+ reg = <0x4a>;
+ };
+ };
+
+ i2c@138B0000 {
+ samsung,i2c-sda-delay = <100>;
+ samsung,i2c-slave-addr = <0x10>;
+ samsung,i2c-max-bus-freq = <100000>;
+ pinctrl-0 = <&i2c5_bus>;
+ pinctrl-names = "default";
+ status = "okay";
+
+ vdd_arm_reg: pmic@60 {
+ compatible = "maxim,max8952";
+ reg = <0x60>;
+
+ max8952,vid-gpios = <&gpx0 3 0>, <&gpx0 4 0>;
+ max8952,default-mode = <0>;
+ max8952,dvs-mode-microvolt = <1250000>, <1200000>,
+ <1050000>, <950000>;
+ max8952,sync-freq = <0>;
+ max8952,ramp-speed = <0>;
+
+ regulator-name = "vdd_arm";
+ regulator-min-microvolt = <770000>;
+ regulator-max-microvolt = <1400000>;
+ regulator-always-on;
+ regulator-boot-on;
+ };
+
+ pmic@66 {
+ compatible = "national,lp3974";
+ reg = <0x66>;
+
+ max8998,pmic-buck1-default-dvs-idx = <0>;
+ max8998,pmic-buck1-dvs-gpios = <&gpx0 5 0>,
+ <&gpx0 6 0>;
+ max8998,pmic-buck1-dvs-voltage = <1100000>, <1000000>,
+ <1100000>, <1000000>;
+
+ max8998,pmic-buck2-default-dvs-idx = <0>;
+ max8998,pmic-buck2-dvs-gpio = <&gpe2 0 0>;
+ max8998,pmic-buck2-dvs-voltage = <1200000>, <1100000>;
+
+ regulators {
+ ldo2_reg: LDO2 {
+ regulator-name = "VALIVE_1.2V";
+ regulator-min-microvolt = <1200000>;
+ regulator-max-microvolt = <1200000>;
+ regulator-always-on;
+ };
+
+ ldo3_reg: LDO3 {
+ regulator-name = "VUSB+MIPI_1.1V";
+ regulator-min-microvolt = <1100000>;
+ regulator-max-microvolt = <1100000>;
+ };
+
+ ldo4_reg: LDO4 {
+ regulator-name = "VADC_3.3V";
+ regulator-min-microvolt = <3300000>;
+ regulator-max-microvolt = <3300000>;
+ };
+
+ ldo5_reg: LDO5 {
+ regulator-name = "VTF_2.8V";
+ regulator-min-microvolt = <2800000>;
+ regulator-max-microvolt = <2800000>;
+ };
+
+ ldo6_reg: LDO6 {
+ regulator-name = "LDO6";
+ regulator-min-microvolt = <2000000>;
+ regulator-max-microvolt = <2000000>;
+ };
+
+ ldo7_reg: LDO7 {
+ regulator-name = "VLCD+VMIPI_1.8V";
+ regulator-min-microvolt = <1800000>;
+ regulator-max-microvolt = <1800000>;
+ };
+
+ ldo8_reg: LDO8 {
+ regulator-name = "VUSB+VDAC_3.3V";
+ regulator-min-microvolt = <3300000>;
+ regulator-max-microvolt = <3300000>;
+ };
+
+ ldo9_reg: LDO9 {
+ regulator-name = "VCC_2.8V";
+ regulator-min-microvolt = <2800000>;
+ regulator-max-microvolt = <2800000>;
+ regulator-always-on;
+ };
+
+ ldo10_reg: LDO10 {
+ regulator-name = "VPLL_1.1V";
+ regulator-min-microvolt = <1100000>;
+ regulator-max-microvolt = <1100000>;
+ regulator-boot-on;
+ regulator-always-on;
+ };
+
+ ldo11_reg: LDO11 {
+ regulator-name = "CAM_AF_3.3V";
+ regulator-min-microvolt = <3300000>;
+ regulator-max-microvolt = <3300000>;
+ };
+
+ ldo12_reg: LDO12 {
+ regulator-name = "PS_2.8V";
+ regulator-min-microvolt = <2800000>;
+ regulator-max-microvolt = <2800000>;
+ };
+
+ ldo13_reg: LDO13 {
+ regulator-name = "VHIC_1.2V";
+ regulator-min-microvolt = <1200000>;
+ regulator-max-microvolt = <1200000>;
+ };
+
+ ldo14_reg: LDO14 {
+ regulator-name = "CAM_I_HOST_1.8V";
+ regulator-min-microvolt = <1800000>;
+ regulator-max-microvolt = <1800000>;
+ };
+
+ ldo15_reg: LDO15 {
+ regulator-name = "CAM_S_DIG+FM33_CORE_1.2V";
+ regulator-min-microvolt = <1200000>;
+ regulator-max-microvolt = <1200000>;
+ };
+
+ ldo16_reg: LDO16 {
+ regulator-name = "CAM_S_ANA_2.8V";
+ regulator-min-microvolt = <2800000>;
+ regulator-max-microvolt = <2800000>;
+ };
+
+ ldo17_reg: LDO17 {
+ regulator-name = "VCC_3.0V_LCD";
+ regulator-min-microvolt = <3000000>;
+ regulator-max-microvolt = <3000000>;
+ };
+
+ buck1_reg: BUCK1 {
+ regulator-name = "VINT_1.1V";
+ regulator-min-microvolt = <750000>;
+ regulator-max-microvolt = <1500000>;
+ regulator-boot-on;
+ regulator-always-on;
+ };
+
+ buck2_reg: BUCK2 {
+ regulator-name = "VG3D_1.1V";
+ regulator-min-microvolt = <750000>;
+ regulator-max-microvolt = <1500000>;
+ regulator-boot-on;
+ };
+
+ buck3_reg: BUCK3 {
+ regulator-name = "VCC_1.8V";
+ regulator-min-microvolt = <1800000>;
+ regulator-max-microvolt = <1800000>;
+ regulator-always-on;
+ };
+
+ buck4_reg: BUCK4 {
+ regulator-name = "VMEM_1.2V";
+ regulator-min-microvolt = <1200000>;
+ regulator-max-microvolt = <1200000>;
+ regulator-always-on;
+ };
+
+ ap32khz_reg: EN32KHz-AP {
+ regulator-name = "32KHz AP";
+ regulator-always-on;
+ };
+
+ cp32khz_reg: EN32KHz-CP {
+ regulator-name = "32KHz CP";
+ };
+
+ vichg_reg: ENVICHG {
+ regulator-name = "VICHG";
+ };
+
+ safeout1_reg: ESAFEOUT1 {
+ regulator-name = "SAFEOUT1";
+ regulator-always-on;
+ };
+
+ safeout2_reg: ESAFEOUT2 {
+ regulator-name = "SAFEOUT2";
+ regulator-boot-on;
+ };
+ };
+ };
+ };
+
+ pwm@139D0000 {
+ compatible = "samsung,s5p6440-pwm";
+ status = "okay";
+ };
+};
diff --git a/arch/arm/mach-exynos/common.c b/arch/arm/mach-exynos/common.c
index 9208079d5d52..4bc1c49c69f1 100644
--- a/arch/arm/mach-exynos/common.c
+++ b/arch/arm/mach-exynos/common.c
@@ -449,13 +449,6 @@ void __init exynos4_init_irq(void)
if (!of_have_populated_dt())
combiner_init(S5P_VA_COMBINER_BASE, NULL,
max_combiner_nr(), COMBINER_IRQ(0, 0));
-
- /*
- * The parameters of s5p_init_irq() are for VIC init.
- * Theses parameters should be NULL and 0 because EXYNOS4
- * uses GIC instead of VIC.
- */
- s5p_init_irq(NULL, 0);
}
void __init exynos5_init_irq(void)
@@ -463,14 +456,6 @@ void __init exynos5_init_irq(void)
#ifdef CONFIG_OF
irqchip_init();
#endif
- /*
- * The parameters of s5p_init_irq() are for VIC init.
- * Theses parameters should be NULL and 0 because EXYNOS4
- * uses GIC instead of VIC.
- */
- if (!of_machine_is_compatible("samsung,exynos5440"))
- s5p_init_irq(NULL, 0);
-
gic_arch_extn.irq_set_wake = s3c_irq_wake;
}
diff --git a/arch/arm/plat-samsung/Kconfig b/arch/arm/plat-samsung/Kconfig
index 77dd30af32f5..53b2d59ca252 100644
--- a/arch/arm/plat-samsung/Kconfig
+++ b/arch/arm/plat-samsung/Kconfig
@@ -105,9 +105,9 @@ config SAMSUNG_IRQ_VIC_TIMER
Internal configuration to build the VIC timer interrupt code.
config S5P_IRQ
- def_bool (ARCH_S5P64X0 || ARCH_S5PC100 || ARCH_S5PV210 || ARCH_EXYNOS)
+ def_bool (ARCH_S5P64X0 || ARCH_S5PC100 || ARCH_S5PV210)
help
- Support common interrup part for ARCH_S5P and ARCH_EXYNOS SoCs
+ Support common interrupt part for ARCH_S5P SoCs
config S5P_EXT_INT
bool
diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index 73fcddb8314d..5d9bab2b5012 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -75,3 +75,12 @@ config CLKSRC_EXYNOS_MCT
def_bool y if ARCH_EXYNOS
help
Support for Multi Core Timer controller on Exynos SoCs.
+
+config CLKSRC_SAMSUNG_PWM
+ bool
+ select CLKSRC_MMIO
+ help
+ This is a new clocksource driver for the PWM timer found in
+ Samsung S3C, S5P and Exynos SoCs, replacing an earlier driver
+ for all devicetree enabled platforms. This driver will be
+ needed only on systems that do not have the Exynos MCT available.
diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
index cd1f09cbd61a..2289f0cb4c4c 100644
--- a/drivers/clocksource/Makefile
+++ b/drivers/clocksource/Makefile
@@ -21,6 +21,7 @@ obj-$(CONFIG_ARCH_TEGRA) += tegra20_timer.o
obj-$(CONFIG_VT8500_TIMER) += vt8500_timer.o
obj-$(CONFIG_CADENCE_TTC_TIMER) += cadence_ttc_timer.o
obj-$(CONFIG_CLKSRC_EXYNOS_MCT) += exynos_mct.o
+obj-$(CONFIG_CLKSRC_SAMSUNG_PWM) += samsung_pwm_timer.o
obj-$(CONFIG_ARM_ARCH_TIMER) += arm_arch_timer.o
obj-$(CONFIG_CLKSRC_METAG_GENERIC) += metag_generic.o
diff --git a/drivers/clocksource/samsung_pwm_timer.c b/drivers/clocksource/samsung_pwm_timer.c
new file mode 100644
index 000000000000..0234c8d2c8f2
--- /dev/null
+++ b/drivers/clocksource/samsung_pwm_timer.c
@@ -0,0 +1,494 @@
+/*
+ * Copyright (c) 2011 Samsung Electronics Co., Ltd.
+ * http://www.samsung.com/
+ *
+ * samsung - Common hr-timer support (s3c and s5p)
+ *
+ * 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/interrupt.h>
+#include <linux/irq.h>
+#include <linux/err.h>
+#include <linux/clk.h>
+#include <linux/clockchips.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include <clocksource/samsung_pwm.h>
+
+#include <asm/sched_clock.h>
+
+/*
+ * Clocksource driver
+ */
+
+#define REG_TCFG0 0x00
+#define REG_TCFG1 0x04
+#define REG_TCON 0x08
+#define REG_TINT_CSTAT 0x44
+
+#define REG_TCNTB(chan) (0x0c + 12 * (chan))
+#define REG_TCMPB(chan) (0x10 + 12 * (chan))
+
+#define TCFG0_PRESCALER_MASK 0xff
+#define TCFG0_PRESCALER1_SHIFT 8
+
+#define TCFG1_SHIFT(x) ((x) * 4)
+#define TCFG1_MUX_MASK 0xf
+
+#define TCON_START(chan) (1 << (4 * (chan) + 0))
+#define TCON_MANUALUPDATE(chan) (1 << (4 * (chan) + 1))
+#define TCON_INVERT(chan) (1 << (4 * (chan) + 2))
+#define TCON_AUTORELOAD(chan) (1 << (4 * (chan) + 3))
+
+DEFINE_SPINLOCK(samsung_pwm_lock);
+EXPORT_SYMBOL(samsung_pwm_lock);
+
+struct samsung_pwm_clocksource {
+ void __iomem *base;
+ unsigned int irq[SAMSUNG_PWM_NUM];
+ struct samsung_pwm_variant variant;
+
+ struct clk *timerclk;
+
+ unsigned int event_id;
+ unsigned int source_id;
+ unsigned int tcnt_max;
+ unsigned int tscaler_div;
+ unsigned int tdiv;
+
+ unsigned long clock_count_per_tick;
+};
+
+static struct samsung_pwm_clocksource pwm;
+
+static void samsung_timer_set_prescale(unsigned int channel, u16 prescale)
+{
+ unsigned long flags;
+ u8 shift = 0;
+ u32 reg;
+
+ if (channel >= 2)
+ shift = TCFG0_PRESCALER1_SHIFT;
+
+ spin_lock_irqsave(&samsung_pwm_lock, flags);
+
+ reg = readl(pwm.base + REG_TCFG0);
+ reg &= ~(TCFG0_PRESCALER_MASK << shift);
+ reg |= (prescale - 1) << shift;
+ writel(reg, pwm.base + REG_TCFG0);
+
+ spin_unlock_irqrestore(&samsung_pwm_lock, flags);
+}
+
+static void samsung_timer_set_divisor(unsigned int channel, u8 divisor)
+{
+ u8 shift = TCFG1_SHIFT(channel);
+ unsigned long flags;
+ u32 reg;
+ u8 bits;
+
+ bits = (fls(divisor) - 1) - pwm.variant.div_base;
+
+ spin_lock_irqsave(&samsung_pwm_lock, flags);
+
+ reg = readl(pwm.base + REG_TCFG1);
+ reg &= ~(TCFG1_MUX_MASK << shift);
+ reg |= bits << shift;
+ writel(reg, pwm.base + REG_TCFG1);
+
+ spin_unlock_irqrestore(&samsung_pwm_lock, flags);
+}
+
+static void samsung_time_stop(unsigned int channel)
+{
+ unsigned long tcon;
+ unsigned long flags;
+
+ if (channel > 0)
+ ++channel;
+
+ spin_lock_irqsave(&samsung_pwm_lock, flags);
+
+ tcon = __raw_readl(pwm.base + REG_TCON);
+ tcon &= ~TCON_START(channel);
+ __raw_writel(tcon, pwm.base + REG_TCON);
+
+ spin_unlock_irqrestore(&samsung_pwm_lock, flags);
+}
+
+static void samsung_time_setup(unsigned int channel, unsigned long tcnt)
+{
+ unsigned long tcon;
+ unsigned long flags;
+ unsigned int tcon_chan = channel;
+
+ if (tcon_chan > 0)
+ ++tcon_chan;
+
+ spin_lock_irqsave(&samsung_pwm_lock, flags);
+
+ tcon = __raw_readl(pwm.base + REG_TCON);
+
+ tcon &= ~(TCON_START(tcon_chan) | TCON_AUTORELOAD(tcon_chan));
+ tcon |= TCON_MANUALUPDATE(tcon_chan);
+
+ __raw_writel(tcnt, pwm.base + REG_TCNTB(channel));
+ __raw_writel(tcnt, pwm.base + REG_TCMPB(channel));
+ __raw_writel(tcon, pwm.base + REG_TCON);
+
+ spin_unlock_irqrestore(&samsung_pwm_lock, flags);
+}
+
+static void samsung_time_start(unsigned int channel, bool periodic)
+{
+ unsigned long tcon;
+ unsigned long flags;
+
+ if (channel > 0)
+ ++channel;
+
+ spin_lock_irqsave(&samsung_pwm_lock, flags);
+
+ tcon = __raw_readl(pwm.base + REG_TCON);
+
+ tcon &= ~TCON_MANUALUPDATE(channel);
+ tcon |= TCON_START(channel);
+
+ if (periodic)
+ tcon |= TCON_AUTORELOAD(channel);
+ else
+ tcon &= ~TCON_AUTORELOAD(channel);
+
+ __raw_writel(tcon, pwm.base + REG_TCON);
+
+ spin_unlock_irqrestore(&samsung_pwm_lock, flags);
+}
+
+static int samsung_set_next_event(unsigned long cycles,
+ struct clock_event_device *evt)
+{
+ /*
+ * This check is needed to account for internal rounding
+ * errors inside clockevents core, which might result in
+ * passing cycles = 0, which in turn would not generate any
+ * timer interrupt and hang the system.
+ *
+ * Another solution would be to set up the clockevent device
+ * with min_delta = 2, but this would unnecessarily increase
+ * the minimum sleep period.
+ */
+ if (!cycles)
+ cycles = 1;
+
+ samsung_time_setup(pwm.event_id, cycles);
+ samsung_time_start(pwm.event_id, false);
+
+ return 0;
+}
+
+static void samsung_timer_resume(void)
+{
+ /* event timer restart */
+ samsung_time_setup(pwm.event_id, pwm.clock_count_per_tick - 1);
+ samsung_time_start(pwm.event_id, true);
+
+ /* source timer restart */
+ samsung_time_setup(pwm.source_id, pwm.tcnt_max);
+ samsung_time_start(pwm.source_id, true);
+}
+
+static void samsung_set_mode(enum clock_event_mode mode,
+ struct clock_event_device *evt)
+{
+ samsung_time_stop(pwm.event_id);
+
+ switch (mode) {
+ case CLOCK_EVT_MODE_PERIODIC:
+ samsung_time_setup(pwm.event_id, pwm.clock_count_per_tick - 1);
+ samsung_time_start(pwm.event_id, true);
+ break;
+
+ case CLOCK_EVT_MODE_ONESHOT:
+ break;
+
+ case CLOCK_EVT_MODE_UNUSED:
+ case CLOCK_EVT_MODE_SHUTDOWN:
+ break;
+
+ case CLOCK_EVT_MODE_RESUME:
+ samsung_timer_resume();
+ break;
+ }
+}
+
+static struct clock_event_device time_event_device = {
+ .name = "samsung_event_timer",
+ .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
+ .rating = 200,
+ .set_next_event = samsung_set_next_event,
+ .set_mode = samsung_set_mode,
+};
+
+static irqreturn_t samsung_clock_event_isr(int irq, void *dev_id)
+{
+ struct clock_event_device *evt = dev_id;
+
+ if (pwm.variant.has_tint_cstat) {
+ u32 mask = (1 << pwm.event_id);
+ writel(mask | (mask << 5), pwm.base + REG_TINT_CSTAT);
+ }
+
+ evt->event_handler(evt);
+
+ return IRQ_HANDLED;
+}
+
+static struct irqaction samsung_clock_event_irq = {
+ .name = "samsung_time_irq",
+ .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
+ .handler = samsung_clock_event_isr,
+ .dev_id = &time_event_device,
+};
+
+static void __init samsung_clockevent_init(void)
+{
+ unsigned long pclk;
+ unsigned long clock_rate;
+ unsigned int irq_number;
+
+ pclk = clk_get_rate(pwm.timerclk);
+
+ samsung_timer_set_prescale(pwm.event_id, pwm.tscaler_div);
+ samsung_timer_set_divisor(pwm.event_id, pwm.tdiv);
+
+ clock_rate = pclk / (pwm.tscaler_div * pwm.tdiv);
+ pwm.clock_count_per_tick = clock_rate / HZ;
+
+ time_event_device.cpumask = cpumask_of(0);
+ clockevents_config_and_register(&time_event_device,
+ clock_rate, 1, pwm.tcnt_max);
+
+ irq_number = pwm.irq[pwm.event_id];
+ setup_irq(irq_number, &samsung_clock_event_irq);
+
+ if (pwm.variant.has_tint_cstat) {
+ u32 mask = (1 << pwm.event_id);
+ writel(mask | (mask << 5), pwm.base + REG_TINT_CSTAT);
+ }
+}
+
+static void __iomem *samsung_timer_reg(void)
+{
+ switch (pwm.source_id) {
+ case 0:
+ case 1:
+ case 2:
+ case 3:
+ return pwm.base + pwm.source_id * 0x0c + 0x14;
+
+ case 4:
+ return pwm.base + 0x40;
+
+ default:
+ BUG();
+ }
+}
+
+/*
+ * Override the global weak sched_clock symbol with this
+ * local implementation which uses the clocksource to get some
+ * better resolution when scheduling the kernel. We accept that
+ * this wraps around for now, since it is just a relative time
+ * stamp. (Inspired by U300 implementation.)
+ */
+static u32 notrace samsung_read_sched_clock(void)
+{
+ void __iomem *reg = samsung_timer_reg();
+
+ if (!reg)
+ return 0;
+
+ return ~__raw_readl(reg);
+}
+
+static void __init samsung_clocksource_init(void)
+{
+ void __iomem *reg = samsung_timer_reg();
+ unsigned long pclk;
+ unsigned long clock_rate;
+ int ret;
+
+ pclk = clk_get_rate(pwm.timerclk);
+
+ samsung_timer_set_prescale(pwm.source_id, pwm.tscaler_div);
+ samsung_timer_set_divisor(pwm.source_id, pwm.tdiv);
+
+ clock_rate = pclk / (pwm.tscaler_div * pwm.tdiv);
+
+ samsung_time_setup(pwm.source_id, pwm.tcnt_max);
+ samsung_time_start(pwm.source_id, true);
+
+ setup_sched_clock(samsung_read_sched_clock,
+ pwm.variant.bits, clock_rate);
+
+ ret = clocksource_mmio_init(reg, "samsung_clocksource_timer",
+ clock_rate, 250, pwm.variant.bits,
+ clocksource_mmio_readl_down);
+ if (ret)
+ panic("samsung_clocksource_timer: can't register clocksource\n");
+}
+
+static void __init samsung_timer_resources(void)
+{
+ pwm.timerclk = clk_get(NULL, "timers");
+ if (IS_ERR(pwm.timerclk))
+ panic("failed to get timers clock for timer");
+
+ clk_prepare_enable(pwm.timerclk);
+
+ pwm.tcnt_max = (1UL << pwm.variant.bits) - 1;
+ if (pwm.variant.bits == 16) {
+ pwm.tscaler_div = 25;
+ pwm.tdiv = 2;
+ } else {
+ pwm.tscaler_div = 2;
+ pwm.tdiv = 1;
+ }
+}
+
+/*
+ * PWM master driver
+ */
+static void __init _samsung_pwm_clocksource_init(void)
+{
+ u8 mask;
+ int channel;
+
+ mask = ~pwm.variant.output_mask & ((1 << SAMSUNG_PWM_NUM) - 1);
+ channel = fls(mask) - 1;
+ if (channel < 0)
+ panic("failed to find PWM channel for clocksource");
+ pwm.source_id = channel;
+
+ mask &= ~(1 << channel);
+ channel = fls(mask) - 1;
+ if (channel < 0)
+ panic("failed to find PWM channel for clock event");
+ pwm.event_id = channel;
+
+ samsung_timer_resources();
+ samsung_clockevent_init();
+ samsung_clocksource_init();
+}
+
+void __init samsung_pwm_clocksource_init(void __iomem *base,
+ unsigned int *irqs, struct samsung_pwm_variant *variant)
+{
+ pwm.base = base;
+ memcpy(&pwm.variant, variant, sizeof(pwm.variant));
+ memcpy(pwm.irq, irqs, SAMSUNG_PWM_NUM * sizeof(*irqs));
+
+ _samsung_pwm_clocksource_init();
+}
+
+#ifdef CONFIG_CLKSRC_OF
+static void __init samsung_pwm_alloc(struct device_node *np,
+ const struct samsung_pwm_variant *variant)
+{
+ struct resource res;
+ struct property *prop;
+ const __be32 *cur;
+ u32 val;
+ int i;
+
+ memcpy(&pwm.variant, variant, sizeof(pwm.variant));
+ for (i = 0; i < SAMSUNG_PWM_NUM; ++i)
+ pwm.irq[i] = irq_of_parse_and_map(np, i);
+
+ of_property_for_each_u32(np, "samsung,pwm-outputs", prop, cur, val) {
+ if (val >= SAMSUNG_PWM_NUM) {
+ pr_warning("%s: invalid channel index in samsung,pwm-outputs property\n",
+ __func__);
+ continue;
+ }
+ pwm.variant.output_mask |= 1 << val;
+ }
+
+ of_address_to_resource(np, 0, &res);
+ if (!request_mem_region(res.start,
+ resource_size(&res), "samsung-pwm")) {
+ pr_err("%s: failed to request IO mem region\n", __func__);
+ return;
+ }
+
+ pwm.base = ioremap(res.start, resource_size(&res));
+ if (!pwm.base) {
+ pr_err("%s: failed to map PWM registers\n", __func__);
+ release_mem_region(res.start, resource_size(&res));
+ return;
+ }
+
+ _samsung_pwm_clocksource_init();
+}
+
+static const struct samsung_pwm_variant s3c24xx_variant = {
+ .bits = 16,
+ .div_base = 1,
+ .has_tint_cstat = false,
+ .tclk_mask = (1 << 4),
+};
+
+static void __init s3c2410_pwm_clocksource_init(struct device_node *np)
+{
+ samsung_pwm_alloc(np, &s3c24xx_variant);
+}
+CLOCKSOURCE_OF_DECLARE(s3c2410_pwm, "samsung,s3c2410-pwm", s3c2410_pwm_clocksource_init);
+
+static const struct samsung_pwm_variant s3c64xx_variant = {
+ .bits = 32,
+ .div_base = 0,
+ .has_tint_cstat = true,
+ .tclk_mask = (1 << 7) | (1 << 6) | (1 << 5),
+};
+
+static void __init s3c64xx_pwm_clocksource_init(struct device_node *np)
+{
+ samsung_pwm_alloc(np, &s3c64xx_variant);
+}
+CLOCKSOURCE_OF_DECLARE(s3c6400_pwm, "samsung,s3c6400-pwm", s3c64xx_pwm_clocksource_init);
+
+static const struct samsung_pwm_variant s5p64x0_variant = {
+ .bits = 32,
+ .div_base = 0,
+ .has_tint_cstat = true,
+ .tclk_mask = 0,
+};
+
+static void __init s5p64x0_pwm_clocksource_init(struct device_node *np)
+{
+ samsung_pwm_alloc(np, &s5p64x0_variant);
+}
+CLOCKSOURCE_OF_DECLARE(s5p6440_pwm, "samsung,s5p6440-pwm", s5p64x0_pwm_clocksource_init);
+
+static const struct samsung_pwm_variant s5p_variant = {
+ .bits = 32,
+ .div_base = 0,
+ .has_tint_cstat = true,
+ .tclk_mask = (1 << 5),
+};
+
+static void __init s5p_pwm_clocksource_init(struct device_node *np)
+{
+ samsung_pwm_alloc(np, &s5p_variant);
+}
+CLOCKSOURCE_OF_DECLARE(s5pc100_pwm, "samsung,s5pc100-pwm", s5p_pwm_clocksource_init);
+#endif
diff --git a/include/clocksource/samsung_pwm.h b/include/clocksource/samsung_pwm.h
new file mode 100644
index 000000000000..5c449c8199e9
--- /dev/null
+++ b/include/clocksource/samsung_pwm.h
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2013 Samsung Electronics Co., Ltd.
+ *
+ * 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.
+ *
+ * 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 <http://www.gnu.org/licenses/>.
+ */
+#ifndef __CLOCKSOURCE_SAMSUNG_PWM_H
+#define __CLOCKSOURCE_SAMSUNG_PWM_H
+
+#include <linux/spinlock.h>
+
+#define SAMSUNG_PWM_NUM 5
+
+extern spinlock_t samsung_pwm_lock;
+
+struct samsung_pwm_variant {
+ u8 bits;
+ u8 div_base;
+ u8 tclk_mask;
+ u8 output_mask;
+ bool has_tint_cstat;
+};
+
+void samsung_pwm_clocksource_init(void __iomem *base,
+ unsigned int *irqs, struct samsung_pwm_variant *variant);
+
+#endif /* __CLOCKSOURCE_SAMSUNG_PWM_H */

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