Thanks for your answer, If you want use to GPD0[2] as I2C_7, you can use it as I2C port. Because We don't use PWM2 Tout. We only use pwm timer2 for internal operation. Thanks, Kyungmin Park <kmpark@xxxxxxxxxxxxx> wrote: >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 -- 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
 |