On Tue, Jul 27, 2010 at 1:12 PM, Sangbeom Kim <sbkim73@xxxxxxxxxxx> wrote: > Hi! Kyungmin, > > After booting, clock event is generated by 2 arm private timers. > What do you mean by 'change the pwm2 pin to i2c functions' ? > What do you use for I2C emulation? (TOUT2 or gpio) > Could you explain it in detail? In the spec, PWM2 is muxed with I2C_7. I muxed it I2C pin to use i2c chip. Thank you, Kyungmin Park > > Thanks and regards, > Sangbeom Kim > > Kyungmin Park <kmpark@xxxxxxxxxxxxx> wrote: > >>Can you confirm that during boot time, change the pwm2 pin to i2c >>functions and still it's working correctly? >> >>1. pwm2 is used for clock event at first boot. >>2. during i2c init, pwm2 pin is changed to i2c functionality. >> >>then where can get the clockevent? >> >>Another possible scenarios is that. >>pwm2 pin is changed to i2c function at bootloader to access the i2c chips. >>Then below code is working? >> >>Thank you, >>Kyungmin Park >> >>On Mon, Jul 26, 2010 at 9:42 PM, Kukjin Kim <kgene.kim@xxxxxxxxxxx> wrote: >>> From: Changhwan Youn <chaos.youn@xxxxxxxxxxx> >>> >>> This patch adds timer support for S5PV310. Until now, all S5P SoCs >>> use CONFIG_ARCH_USES_GETTIMEOFFSET macro as a default configuration. >>> Instead,S5PV310 implements clocksource and clock_event_device to >>> support the high resolution timer and tickless system. >>> >>> Signed-off-by: Changhwan Youn <chaos.youn@xxxxxxxxxxx> >>> Signed-off-by: Hyuk Lee <hyuk1.lee@xxxxxxxxxxx> >>> Signed-off-by: Kukjin Kim <kgene.kim@xxxxxxxxxxx> >>> --- >>> Changes since v3: >>> >>> - Changes clock source from PWM2 to PWM4 because PWM4 cannot be used for >>> other purpose such as external output function through GPIO. >>> >>> arch/arm/mach-s5pv310/include/mach/pwm-clock.h | 70 ++++++ >>> arch/arm/mach-s5pv310/localtimer.c | 25 ++ >>> arch/arm/mach-s5pv310/time.c | 287 >>++++++++++++++++++++++++ >>> arch/arm/plat-s5p/include/plat/s5pv310.h | 1 + >>> arch/arm/plat-samsung/Makefile | 2 +- >>> 5 files changed, 384 insertions(+), 1 deletions(-) >>> create mode 100644 arch/arm/mach-s5pv310/include/mach/pwm-clock.h >>> create mode 100644 arch/arm/mach-s5pv310/localtimer.c >>> create mode 100644 arch/arm/mach-s5pv310/time.c >>> >>> diff --git a/arch/arm/mach-s5pv310/include/mach/pwm-clock.h >>b/arch/arm/mach-s5pv310/include/mach/pwm-clock.h >>> new file mode 100644 >>> index 0000000..7e6da27 >>> --- /dev/null >>> +++ b/arch/arm/mach-s5pv310/include/mach/pwm-clock.h >>> @@ -0,0 +1,70 @@ >>> +/* linux/arch/arm/mach-s5pv310/include/mach/pwm-clock.h >>> + * >>> + * Copyright (c) 2010 Samsung Electronics Co., Ltd. >>> + * http://www.samsung.com/ >>> + * >>> + * Copyright 2008 Openmoko, Inc. >>> + * Copyright 2008 Simtec Electronics >>> + * Ben Dooks <ben@xxxxxxxxxxxx> >>> + * http://armlinux.simtec.co.uk/ >>> + * >>> + * Based on arch/arm/mach-s3c64xx/include/mach/pwm-clock.h >>> + * >>> + * S5PV310 - pwm clock and timer support >>> + * >>> + * 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_PWMCLK_H >>> +#define __ASM_ARCH_PWMCLK_H __FILE__ >>> + >>> +/** >>> + * pwm_cfg_src_is_tclk() - return whether the given mux config is a tclk >>> + * @tcfg: The timer TCFG1 register bits shifted down to 0. >>> + * >>> + * Return true if the given configuration from TCFG1 is a TCLK instead >>> + * any of the TDIV clocks. >>> + */ >>> +static inline int pwm_cfg_src_is_tclk(unsigned long tcfg) >>> +{ >>> + return tcfg == S3C64XX_TCFG1_MUX_TCLK; >>> +} >>> + >>> +/** >>> + * tcfg_to_divisor() - convert tcfg1 setting to a divisor >>> + * @tcfg1: The tcfg1 setting, shifted down. >>> + * >>> + * Get the divisor value for the given tcfg1 setting. We assume the >>> + * caller has already checked to see if this is not a TCLK source. >>> + */ >>> +static inline unsigned long tcfg_to_divisor(unsigned long tcfg1) >>> +{ >>> + return 1 << tcfg1; >>> +} >>> + >>> +/** >>> + * pwm_tdiv_has_div1() - does the tdiv setting have a /1 >>> + * >>> + * Return true if we have a /1 in the tdiv setting. >>> + */ >>> +static inline unsigned int pwm_tdiv_has_div1(void) >>> +{ >>> + return 1; >>> +} >>> + >>> +/** >>> + * pwm_tdiv_div_bits() - calculate TCFG1 divisor value. >>> + * @div: The divisor to calculate the bit information for. >>> + * >>> + * Turn a divisor into the necessary bit field for TCFG1. >>> + */ >>> +static inline unsigned long pwm_tdiv_div_bits(unsigned int div) >>> +{ >>> + return ilog2(div); >>> +} >>> + >>> +#define S3C_TCFG1_MUX_TCLK S3C64XX_TCFG1_MUX_TCLK >>> + >>> +#endif /* __ASM_ARCH_PWMCLK_H */ >>> diff --git a/arch/arm/mach-s5pv310/localtimer.c b/arch/arm/mach- >>s5pv310/localtimer.c >>> new file mode 100644 >>> index 0000000..2784036 >>> --- /dev/null >>> +++ b/arch/arm/mach-s5pv310/localtimer.c >>> @@ -0,0 +1,25 @@ >>> +/* linux/arch/arm/mach-s5pv310/localtimer.c >>> + * >>> + * Cloned from linux/arch/arm/mach-realview/localtimer.c >>> + * >>> + * Copyright (C) 2002 ARM Ltd. >>> + * All Rights Reserved >>> + * >>> + * 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/clockchips.h> >>> + >>> +#include <asm/irq.h> >>> +#include <asm/localtimer.h> >>> + >>> +/* >>> + * Setup the local clock events for a CPU. >>> + */ >>> +void __cpuinit local_timer_setup(struct clock_event_device *evt) >>> +{ >>> + evt->irq = IRQ_LOCALTIMER; >>> + twd_timer_setup(evt); >>> +} >>> diff --git a/arch/arm/mach-s5pv310/time.c b/arch/arm/mach-s5pv310/time.c >>> new file mode 100644 >>> index 0000000..01b012a >>> --- /dev/null >>> +++ b/arch/arm/mach-s5pv310/time.c >>> @@ -0,0 +1,287 @@ >>> +/* linux/arch/arm/mach-s5pv310/time.c >>> + * >>> + * Copyright (c) 2010 Samsung Electronics Co., Ltd. >>> + * http://www.samsung.com >>> + * >>> + * S5PV310 (and compatible) HRT support >>> + * PWM 2/4 is used for this feature >>> + * >>> + * 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/sched.h> >>> +#include <linux/interrupt.h> >>> +#include <linux/irq.h> >>> +#include <linux/err.h> >>> +#include <linux/clk.h> >>> +#include <linux/clockchips.h> >>> +#include <linux/platform_device.h> >>> + >>> +#include <asm/smp_twd.h> >>> + >>> +#include <mach/map.h> >>> +#include <plat/regs-timer.h> >>> +#include <asm/mach/time.h> >>> + >>> +static unsigned long clock_count_per_tick; >>> + >>> +static struct clk *tin2; >>> +static struct clk *tin4; >>> +static struct clk *tdiv2; >>> +static struct clk *tdiv4; >>> +static struct clk *timerclk; >>> + >>> +static void s5pv310_pwm_stop(unsigned int pwm_id) >>> +{ >>> + unsigned long tcon; >>> + >>> + tcon = __raw_readl(S3C2410_TCON); >>> + >>> + switch (pwm_id) { >>> + case 2: >>> + tcon &= ~S3C2410_TCON_T2START; >>> + break; >>> + case 4: >>> + tcon &= ~S3C2410_TCON_T4START; >>> + break; >>> + default: >>> + break; >>> + } >>> + __raw_writel(tcon, S3C2410_TCON); >>> +} >>> + >>> +static void s5pv310_pwm_init(unsigned int pwm_id, unsigned long tcnt) >>> +{ >>> + unsigned long tcon; >>> + >>> + tcon = __raw_readl(S3C2410_TCON); >>> + >>> + /* timers reload after counting zero, so reduce the count by 1 */ >>> + tcnt--; >>> + >>> + /* ensure timer is stopped... */ >>> + switch (pwm_id) { >>> + case 2: >>> + tcon &= ~(0xf<<12); >>> + tcon |= S3C2410_TCON_T2MANUALUPD; >>> + >>> + __raw_writel(tcnt, S3C2410_TCNTB(2)); >>> + __raw_writel(tcnt, S3C2410_TCMPB(2)); >>> + __raw_writel(tcon, S3C2410_TCON); >>> + >>> + break; >>> + case 4: >>> + tcon &= ~(7<<20); >>> + tcon |= S3C2410_TCON_T4MANUALUPD; >>> + >>> + __raw_writel(tcnt, S3C2410_TCNTB(4)); >>> + __raw_writel(tcnt, S3C2410_TCMPB(4)); >>> + __raw_writel(tcon, S3C2410_TCON); >>> + >>> + break; >>> + default: >>> + break; >>> + } >>> +} >>> + >>> +static inline void s5pv310_pwm_start(unsigned int pwm_id, bool periodic) >>> +{ >>> + unsigned long tcon; >>> + >>> + tcon = __raw_readl(S3C2410_TCON); >>> + >>> + switch (pwm_id) { >>> + case 2: >>> + tcon |= S3C2410_TCON_T2START; >>> + tcon &= ~S3C2410_TCON_T2MANUALUPD; >>> + >>> + if (periodic) >>> + tcon |= S3C2410_TCON_T2RELOAD; >>> + else >>> + tcon &= ~S3C2410_TCON_T2RELOAD; >>> + break; >>> + case 4: >>> + tcon |= S3C2410_TCON_T4START; >>> + tcon &= ~S3C2410_TCON_T4MANUALUPD; >>> + >>> + if (periodic) >>> + tcon |= S3C2410_TCON_T4RELOAD; >>> + else >>> + tcon &= ~S3C2410_TCON_T4RELOAD; >>> + break; >>> + default: >>> + break; >>> + } >>> + __raw_writel(tcon, S3C2410_TCON); >>> +} >>> + >>> +static int s5pv310_pwm_set_next_event(unsigned long cycles, >>> + struct clock_event_device *evt) >>> +{ >>> + s5pv310_pwm_init(2, cycles); >>> + s5pv310_pwm_start(2, 0); >>> + return 0; >>> +} >>> + >>> +static void s5pv310_pwm_set_mode(enum clock_event_mode mode, >>> + struct clock_event_device *evt) >>> +{ >>> + s5pv310_pwm_stop(2); >>> + >>> + switch (mode) { >>> + case CLOCK_EVT_MODE_PERIODIC: >>> + s5pv310_pwm_init(2, clock_count_per_tick); >>> + s5pv310_pwm_start(2, 1); >>> + break; >>> + case CLOCK_EVT_MODE_ONESHOT: >>> + break; >>> + case CLOCK_EVT_MODE_UNUSED: >>> + case CLOCK_EVT_MODE_SHUTDOWN: >>> + case CLOCK_EVT_MODE_RESUME: >>> + break; >>> + } >>> +} >>> + >>> +static struct clock_event_device pwm_event_device = { >>> + .name = "pwm_timer2", >>> + .features = CLOCK_EVT_FEAT_PERIODIC | > CLOCK_EVT_FEAT_ONESHOT, >>> + .rating = 200, >>> + .shift = 32, >>> + .set_next_event = s5pv310_pwm_set_next_event, >>> + .set_mode = s5pv310_pwm_set_mode, >>> +}; >>> + >>> +irqreturn_t s5pv310_clock_event_isr(int irq, void *dev_id) >>> +{ >>> + struct clock_event_device *evt = &pwm_event_device; >>> + >>> + evt->event_handler(evt); >>> + >>> + return IRQ_HANDLED; >>> +} >>> + >>> +static struct irqaction s5pv310_clock_event_irq = { >>> + .name = "pwm_timer2_irq", >>> + .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL, >>> + .handler = s5pv310_clock_event_isr, >>> +}; >>> + >>> +static void __init s5pv310_clockevent_init(void) >>> +{ >>> + unsigned long pclk; >>> + unsigned long clock_rate; >>> + struct clk *tscaler; >>> + >>> + pclk = clk_get_rate(timerclk); >>> + >>> + /* configure clock tick */ >>> + >>> + tscaler = clk_get_parent(tdiv2); >>> + >>> + clk_set_rate(tscaler, pclk / 2); >>> + clk_set_rate(tdiv2, pclk / 2); >>> + clk_set_parent(tin2, tdiv2); >>> + >>> + clock_rate = clk_get_rate(tin2); >>> + >>> + clock_count_per_tick = clock_rate / HZ; >>> + >>> + pwm_event_device.mult = >>> + div_sc(clock_rate, NSEC_PER_SEC, pwm_event_device.shift); >>> + pwm_event_device.max_delta_ns = >>> + clockevent_delta2ns(-1, &pwm_event_device); >>> + pwm_event_device.min_delta_ns = >>> + clockevent_delta2ns(1, &pwm_event_device); >>> + >>> + pwm_event_device.cpumask = cpumask_of(0); >>> + clockevents_register_device(&pwm_event_device); >>> + >>> + setup_irq(IRQ_TIMER2, &s5pv310_clock_event_irq); >>> +} >>> + >>> +static cycle_t s5pv310_pwm4_read(struct clocksource *cs) >>> +{ >>> + return (cycle_t) ~__raw_readl(S3C_TIMERREG(0x40)); >>> +} >>> + >>> +struct clocksource pwm_clocksource = { >>> + .name = "pwm_timer4", >>> + .rating = 250, >>> + .read = s5pv310_pwm4_read, >>> + .mask = CLOCKSOURCE_MASK(32), >>> + .shift = 20, >>> + .flags = CLOCK_SOURCE_IS_CONTINUOUS , >>> +}; >>> + >>> +static void __init s5pv310_clocksource_init(void) >>> +{ >>> + unsigned long pclk; >>> + unsigned long clock_rate; >>> + >>> + pclk = clk_get_rate(timerclk); >>> + >>> + clk_set_rate(tdiv4, pclk / 2); >>> + clk_set_parent(tin4, tdiv4); >>> + >>> + clock_rate = clk_get_rate(tin4); >>> + >>> + s5pv310_pwm_init(4, ~0); >>> + s5pv310_pwm_start(4, 1); >>> + >>> + pwm_clocksource.mult = >>> + clocksource_khz2mult(clock_rate/1000, >>pwm_clocksource.shift); >>> + >>> + if (clocksource_register(&pwm_clocksource)) >>> + panic("%s: can't register clocksource\n", >>pwm_clocksource.name); >>> +} >>> + >>> +static void __init s5pv310_timer_resources(void) >>> +{ >>> + struct platform_device tmpdev; >>> + >>> + tmpdev.dev.bus = &platform_bus_type; >>> + >>> + timerclk = clk_get(NULL, "timers"); >>> + if (IS_ERR(timerclk)) >>> + panic("failed to get timers clock for system timer"); >>> + >>> + clk_enable(timerclk); >>> + >>> + tmpdev.id = 2; >>> + tin2 = clk_get(&tmpdev.dev, "pwm-tin"); >>> + if (IS_ERR(tin2)) >>> + panic("failed to get pwm-tin2 clock for system timer"); >>> + >>> + tdiv2 = clk_get(&tmpdev.dev, "pwm-tdiv"); >>> + if (IS_ERR(tdiv2)) >>> + panic("failed to get pwm-tdiv2 clock for system timer"); >>> + clk_enable(tin2); >>> + >>> + tmpdev.id = 4; >>> + tin4 = clk_get(&tmpdev.dev, "pwm-tin"); >>> + if (IS_ERR(tin4)) >>> + panic("failed to get pwm-tin4 clock for system timer"); >>> + >>> + tdiv4 = clk_get(&tmpdev.dev, "pwm-tdiv"); >>> + if (IS_ERR(tdiv4)) >>> + panic("failed to get pwm-tdiv4 clock for system timer"); >>> + >>> + clk_enable(tin4); >>> +} >>> + >>> +static void __init s5pv310_timer_init(void) >>> +{ >>> +#ifdef CONFIG_LOCAL_TIMERS >>> + twd_base = S5P_VA_TWD; >>> +#endif >>> + >>> + s5pv310_timer_resources(); >>> + s5pv310_clockevent_init(); >>> + s5pv310_clocksource_init(); >>> +} >>> + >>> +struct sys_timer s5pv310_timer = { >>> + .init = s5pv310_timer_init, >>> +}; >>> diff --git a/arch/arm/plat-s5p/include/plat/s5pv310.h b/arch/arm/plat- >>s5p/include/plat/s5pv310.h >>> index d2f05e1..769c991 100644 >>> --- a/arch/arm/plat-s5p/include/plat/s5pv310.h >>> +++ b/arch/arm/plat-s5p/include/plat/s5pv310.h >>> @@ -22,6 +22,7 @@ extern int s5pv310_init(void); >>> extern void s5pv310_init_irq(void); >>> extern void s5pv310_map_io(void); >>> extern void s5pv310_init_clocks(int xtal); >>> +extern struct sys_timer s5pv310_timer; >>> >>> #define s5pv310_init_uarts s5pv310_common_init_uarts >>> >>> diff --git a/arch/arm/plat-samsung/Makefile b/arch/arm/plat- >>samsung/Makefile >>> index b1d82cc..0d5bf8a 100644 >>> --- a/arch/arm/plat-samsung/Makefile >>> +++ b/arch/arm/plat-samsung/Makefile >>> @@ -12,7 +12,7 @@ obj- := >>> # Objects we always build independent of SoC choice >>> >>> obj-y += init.o >>> -obj-y += time.o >>> +obj-$(CONFIG_ARCH_USES_GETTIMEOFFSET) += time.o >>> obj-y += clock.o >>> obj-y += pwm-clock.o >>> obj-y += gpio.o >>> -- >>> 1.6.2.5 >>> >>> -- >>> To unsubscribe from this list: send the line "unsubscribe linux-samsung- >>soc" in >>> the body of a message to majordomo@xxxxxxxxxxxxxxx >>> More majordomo info at http://vger.kernel.org/majordomo-info.html >>> >> >>_______________________________________________ >>linux-arm-kernel mailing list >>linux-arm-kernel@xxxxxxxxxxxxxxxxxxx >>http://lists.infradead.org/mailman/listinfo/linux-arm-kernel > > -- > To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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