From 5a3a388fbefac3705dfcde16c93fc81e6fd9378f Mon Sep 17 00:00:00 2001 From: Kevin Hilman Date: Mon, 12 Nov 2007 23:24:02 -0800 Subject: ARM: OMAP: Timer32K: Re-organize duplicated 32k-timer code On OMAP2/3, the gp-timer code can be used for a 32kHz timer simply by setting the source to be the 32k clock instead of sys_clk. This patch uses the mach-omap2/timer-gp.c code for 32kHz timer on OMAP2, moving the logic into mach-omap2/timer-gp.c, and not using plat-omap/timer32k.c which, for OMAP2, is redundant with the timer-gp code. Also, if CONFIG_OMAP_32K_TIMER is enabled, the gptimer-based clocksource is not used. Instead the default 32k sync counter is used as the clocksource (see the clocksource in plat-omap/common.c.) This is important for sleep/suspend so there is a valid counter during sleep. Note that the suspend/sleep code needs fixing to check for overflows of this counter. In addition, the OMAP2/3 details are removed from timer32k.c leaving that with only OMAP1 specifics. A follow-up patch will move it from plat-omap common code to mach-omap1. Signed-off-by: Kevin Hilman Signed-off-by: Tony Lindgren --- arch/arm/mach-omap2/Makefile | 4 +- arch/arm/mach-omap2/timer-gp.c | 152 +++++++++++++++++++++++++++++++++++++---- arch/arm/plat-omap/Makefile | 2 + arch/arm/plat-omap/timer32k.c | 44 +----------- 4 files changed, 141 insertions(+), 61 deletions(-) (limited to 'arch') diff --git a/arch/arm/mach-omap2/Makefile b/arch/arm/mach-omap2/Makefile index b05b738d31e..ac343ec578c 100644 --- a/arch/arm/mach-omap2/Makefile +++ b/arch/arm/mach-omap2/Makefile @@ -4,9 +4,7 @@ # Common support obj-y := irq.o id.o io.o sram-fn.o memory.o prcm.o clock.o mux.o devices.o \ - serial.o gpmc.o - -obj-$(CONFIG_OMAP_MPU_TIMER) += timer-gp.o + serial.o gpmc.o timer-gp.o # Power Management obj-$(CONFIG_PM) += pm.o pm-domain.o sleep.o diff --git a/arch/arm/mach-omap2/timer-gp.c b/arch/arm/mach-omap2/timer-gp.c index 3234deedb94..78d05f203ff 100644 --- a/arch/arm/mach-omap2/timer-gp.c +++ b/arch/arm/mach-omap2/timer-gp.c @@ -3,6 +3,11 @@ * * OMAP2 GP timer support. * + * Update to use new clocksource/clockevent layers + * Author: Kevin Hilman, MontaVista Software, Inc. + * Copyright (C) 2007 MontaVista Software, Inc. + * + * Original driver: * Copyright (C) 2005 Nokia Corporation * Author: Paul Mundt * Juha Yrjölä @@ -25,24 +30,23 @@ #include #include #include +#include +#include #include #include static struct omap_dm_timer *gptimer; - -static inline void omap2_gp_timer_start(unsigned long load_val) -{ - omap_dm_timer_set_load(gptimer, 1, 0xffffffff - load_val); - omap_dm_timer_set_int_enable(gptimer, OMAP_TIMER_INT_OVERFLOW); - omap_dm_timer_start(gptimer); -} +static struct clock_event_device clockevent_gpt; static irqreturn_t omap2_gp_timer_interrupt(int irq, void *dev_id) { - omap_dm_timer_write_status(gptimer, OMAP_TIMER_INT_OVERFLOW); - timer_tick(); + struct omap_dm_timer *gpt = (struct omap_dm_timer *)dev_id; + struct clock_event_device *evt = &clockevent_gpt; + + omap_dm_timer_write_status(gpt, OMAP_TIMER_INT_OVERFLOW); + evt->event_handler(evt); return IRQ_HANDLED; } @@ -52,20 +56,138 @@ static struct irqaction omap2_gp_timer_irq = { .handler = omap2_gp_timer_interrupt, }; -static void __init omap2_gp_timer_init(void) +static int omap2_gp_timer_set_next_event(unsigned long cycles, + struct clock_event_device *evt) { - u32 tick_period; + omap_dm_timer_set_load(gptimer, 0, 0xffffffff - cycles); + omap_dm_timer_start(gptimer); + + return 0; +} + +static void omap2_gp_timer_set_mode(enum clock_event_mode mode, + struct clock_event_device *evt) +{ + u32 period; + + omap_dm_timer_stop(gptimer); + + switch (mode) { + case CLOCK_EVT_MODE_PERIODIC: + period = clk_get_rate(omap_dm_timer_get_fclk(gptimer)) / HZ; + period -= 1; + + omap_dm_timer_set_load(gptimer, 1, 0xffffffff - period); + omap_dm_timer_start(gptimer); + 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 clockevent_gpt = { + .name = "gp timer", + .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT, + .shift = 32, + .set_next_event = omap2_gp_timer_set_next_event, + .set_mode = omap2_gp_timer_set_mode, +}; + +static void __init omap2_gp_clockevent_init(void) +{ + u32 tick_rate; - omap_dm_timer_init(); gptimer = omap_dm_timer_request_specific(1); BUG_ON(gptimer == NULL); +#if defined(CONFIG_OMAP_32K_TIMER) + omap_dm_timer_set_source(gptimer, OMAP_TIMER_SRC_32_KHZ); +#else omap_dm_timer_set_source(gptimer, OMAP_TIMER_SRC_SYS_CLK); - tick_period = clk_get_rate(omap_dm_timer_get_fclk(gptimer)) / HZ; - tick_period -= 1; +#endif + tick_rate = clk_get_rate(omap_dm_timer_get_fclk(gptimer)); + omap2_gp_timer_irq.dev_id = (void *)gptimer; setup_irq(omap_dm_timer_get_irq(gptimer), &omap2_gp_timer_irq); - omap2_gp_timer_start(tick_period); + omap_dm_timer_set_int_enable(gptimer, OMAP_TIMER_INT_OVERFLOW); + + clockevent_gpt.mult = div_sc(tick_rate, NSEC_PER_SEC, + clockevent_gpt.shift); + clockevent_gpt.max_delta_ns = + clockevent_delta2ns(0xffffffff, &clockevent_gpt); + clockevent_gpt.min_delta_ns = + clockevent_delta2ns(1, &clockevent_gpt); + + clockevent_gpt.cpumask = cpumask_of_cpu(0); + clockevents_register_device(&clockevent_gpt); +} + +#ifdef CONFIG_OMAP_32K_TIMER +/* + * When 32k-timer is enabled, don't use GPTimer for clocksource + * instead, just leave default clocksource which uses the 32k + * sync counter. See clocksource setup in see plat-omap/common.c. + */ + +static inline void __init omap2_gp_clocksource_init(void) {} +#else +/* + * clocksource + */ +static struct omap_dm_timer *gpt_clocksource; +static cycle_t clocksource_read_cycles(void) +{ + return (cycle_t)omap_dm_timer_read_counter(gpt_clocksource); +} + +static struct clocksource clocksource_gpt = { + .name = "gp timer", + .rating = 300, + .read = clocksource_read_cycles, + .mask = CLOCKSOURCE_MASK(32), + .shift = 24, + .flags = CLOCK_SOURCE_IS_CONTINUOUS, +}; + +/* Setup free-running counter for clocksource */ +static void __init omap2_gp_clocksource_init(void) +{ + static struct omap_dm_timer *gpt; + u32 tick_rate, tick_period; + static char err1[] __initdata = KERN_ERR + "%s: failed to request dm-timer\n"; + static char err2[] __initdata = KERN_ERR + "%s: can't register clocksource!\n"; + + gpt = omap_dm_timer_request(); + if (!gpt) + printk(err1, clocksource_gpt.name); + gpt_clocksource = gpt; + + omap_dm_timer_set_source(gpt, OMAP_TIMER_SRC_SYS_CLK); + tick_rate = clk_get_rate(omap_dm_timer_get_fclk(gpt)); + tick_period = (tick_rate / HZ) - 1; + + omap_dm_timer_set_load(gpt, 1, 0); + omap_dm_timer_start(gpt); + + clocksource_gpt.mult = + clocksource_khz2mult(tick_rate/1000, clocksource_gpt.shift); + if (clocksource_register(&clocksource_gpt)) + printk(err2, clocksource_gpt.name); +} +#endif + +static void __init omap2_gp_timer_init(void) +{ + omap_dm_timer_init(); + + omap2_gp_clockevent_init(); + omap2_gp_clocksource_init(); } struct sys_timer omap_timer = { diff --git a/arch/arm/plat-omap/Makefile b/arch/arm/plat-omap/Makefile index 8f56c255d1e..d91424edf57 100644 --- a/arch/arm/plat-omap/Makefile +++ b/arch/arm/plat-omap/Makefile @@ -9,7 +9,9 @@ obj-m := obj-n := obj- := +ifeq ($(CONFIG_ARCH_OMAP1),y) obj-$(CONFIG_OMAP_32K_TIMER) += timer32k.o +endif # OCPI interconnect support for 1710, 1610 and 5912 obj-$(CONFIG_ARCH_OMAP16XX) += ocpi.o diff --git a/arch/arm/plat-omap/timer32k.c b/arch/arm/plat-omap/timer32k.c index ea76f1979a3..ce034dc59d4 100644 --- a/arch/arm/plat-omap/timer32k.c +++ b/arch/arm/plat-omap/timer32k.c @@ -40,6 +40,7 @@ #include #include #include + #include #include #include @@ -93,8 +94,6 @@ struct sys_timer omap_timer; #define JIFFIES_TO_HW_TICKS(nr_jiffies, clock_rate) \ (((nr_jiffies) * (clock_rate)) / HZ) -#if defined(CONFIG_ARCH_OMAP1) - static inline void omap_32k_timer_write(int val, int reg) { omap_writew(val, OMAP1_32K_TIMER_BASE + reg); @@ -120,30 +119,6 @@ static inline void omap_32k_timer_stop(void) #define omap_32k_timer_ack_irq() -#elif defined(CONFIG_ARCH_OMAP2) - -static struct omap_dm_timer *gptimer; - -static inline void omap_32k_timer_start(unsigned long load_val) -{ - omap_dm_timer_set_load(gptimer, 1, 0xffffffff - load_val); - omap_dm_timer_set_int_enable(gptimer, OMAP_TIMER_INT_OVERFLOW); - omap_dm_timer_start(gptimer); -} - -static inline void omap_32k_timer_stop(void) -{ - omap_dm_timer_stop(gptimer); -} - -static inline void omap_32k_timer_ack_irq(void) -{ - u32 status = omap_dm_timer_read_status(gptimer); - omap_dm_timer_write_status(gptimer, status); -} - -#endif - static void omap_32k_timer_set_mode(enum clock_event_mode mode, struct clock_event_device *evt) { @@ -222,23 +197,6 @@ static struct irqaction omap_32k_timer_irq = { static __init void omap_init_32k_timer(void) { - if (cpu_class_is_omap1()) - setup_irq(INT_OS_TIMER, &omap_32k_timer_irq); - -#ifdef CONFIG_ARCH_OMAP2 - /* REVISIT: Check 24xx TIOCP_CFG settings after idle works */ - if (cpu_is_omap24xx()) { - gptimer = omap_dm_timer_request_specific(1); - BUG_ON(gptimer == NULL); - - omap_dm_timer_set_source(gptimer, OMAP_TIMER_SRC_32_KHZ); - setup_irq(omap_dm_timer_get_irq(gptimer), &omap_32k_timer_irq); - omap_dm_timer_set_int_enable(gptimer, - OMAP_TIMER_INT_CAPTURE | OMAP_TIMER_INT_OVERFLOW | - OMAP_TIMER_INT_MATCH); - } -#endif - clockevent_32k_timer.mult = div_sc(OMAP_32K_TICKS_PER_SEC, NSEC_PER_SEC, clockevent_32k_timer.shift); -- cgit v1.2.3