diff options
Diffstat (limited to 'arch/arm/mach-omap2/timer-gp.c')
| -rw-r--r-- | arch/arm/mach-omap2/timer-gp.c | 266 |
1 files changed, 0 insertions, 266 deletions
diff --git a/arch/arm/mach-omap2/timer-gp.c b/arch/arm/mach-omap2/timer-gp.c deleted file mode 100644 index 3b9cf85..0000000 --- a/arch/arm/mach-omap2/timer-gp.c +++ /dev/null @@ -1,266 +0,0 @@ -/* - * linux/arch/arm/mach-omap2/timer-gp.c - * - * OMAP2 GP timer support. - * - * Copyright (C) 2009 Nokia Corporation - * - * Update to use new clocksource/clockevent layers - * Author: Kevin Hilman, MontaVista Software, Inc. <source@mvista.com> - * Copyright (C) 2007 MontaVista Software, Inc. - * - * Original driver: - * Copyright (C) 2005 Nokia Corporation - * Author: Paul Mundt <paul.mundt@nokia.com> - * Juha Yrjölä <juha.yrjola@nokia.com> - * OMAP Dual-mode timer framework support by Timo Teras - * - * Some parts based off of TI's 24xx code: - * - * Copyright (C) 2004-2009 Texas Instruments, Inc. - * - * Roughly modelled after the OMAP1 MPU timer code. - * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com> - * - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file "COPYING" in the main directory of this archive - * for more details. - */ -#include <linux/init.h> -#include <linux/time.h> -#include <linux/interrupt.h> -#include <linux/err.h> -#include <linux/clk.h> -#include <linux/delay.h> -#include <linux/irq.h> -#include <linux/clocksource.h> -#include <linux/clockchips.h> - -#include <asm/mach/time.h> -#include <plat/dmtimer.h> -#include <asm/localtimer.h> -#include <asm/sched_clock.h> -#include <plat/common.h> -#include <plat/omap_hwmod.h> - -#include "timer-gp.h" - - -/* MAX_GPTIMER_ID: number of GPTIMERs on the chip */ -#define MAX_GPTIMER_ID 12 - -static struct omap_dm_timer *gptimer; -static struct clock_event_device clockevent_gpt; -static u8 __initdata gptimer_id = 1; -static u8 __initdata inited; -struct omap_dm_timer *gptimer_wakeup; - -static irqreturn_t omap2_gp_timer_interrupt(int irq, void *dev_id) -{ - 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; -} - -static struct irqaction omap2_gp_timer_irq = { - .name = "gp timer", - .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL, - .handler = omap2_gp_timer_interrupt, -}; - -static int omap2_gp_timer_set_next_event(unsigned long cycles, - struct clock_event_device *evt) -{ - omap_dm_timer_set_load_start(gptimer, 0, 0xffffffff - cycles); - - 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_start(gptimer, 1, 0xffffffff - period); - 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, -}; - -/** - * omap2_gp_clockevent_set_gptimer - set which GPTIMER is used for clockevents - * @id: GPTIMER to use (1..MAX_GPTIMER_ID) - * - * Define the GPTIMER that the system should use for the tick timer. - * Meant to be called from board-*.c files in the event that GPTIMER1, the - * default, is unsuitable. Returns -EINVAL on error or 0 on success. - */ -int __init omap2_gp_clockevent_set_gptimer(u8 id) -{ - if (id < 1 || id > MAX_GPTIMER_ID) - return -EINVAL; - - BUG_ON(inited); - - gptimer_id = id; - - return 0; -} - -static void __init omap2_gp_clockevent_init(void) -{ - u32 tick_rate; - int src; - char clockevent_hwmod_name[8]; /* 8 = sizeof("timerXX0") */ - - inited = 1; - - sprintf(clockevent_hwmod_name, "timer%d", gptimer_id); - omap_hwmod_setup_one(clockevent_hwmod_name); - - gptimer = omap_dm_timer_request_specific(gptimer_id); - BUG_ON(gptimer == NULL); - gptimer_wakeup = gptimer; - -#if defined(CONFIG_OMAP_32K_TIMER) - src = OMAP_TIMER_SRC_32_KHZ; -#else - src = OMAP_TIMER_SRC_SYS_CLK; - WARN(gptimer_id == 12, "WARNING: GPTIMER12 can only use the " - "secure 32KiHz clock source\n"); -#endif - - if (gptimer_id != 12) - WARN(IS_ERR_VALUE(omap_dm_timer_set_source(gptimer, src)), - "timer-gp: omap_dm_timer_set_source() failed\n"); - - tick_rate = clk_get_rate(omap_dm_timer_get_fclk(gptimer)); - - pr_info("OMAP clockevent source: GPTIMER%d at %u Hz\n", - gptimer_id, tick_rate); - - omap2_gp_timer_irq.dev_id = (void *)gptimer; - setup_irq(omap_dm_timer_get_irq(gptimer), &omap2_gp_timer_irq); - 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(3, &clockevent_gpt); - /* Timer internal resynch latency. */ - - clockevent_gpt.cpumask = cpumask_of(0); - clockevents_register_device(&clockevent_gpt); -} - -/* Clocksource code */ - -#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 plat-omap/counter_32k.c - */ - -static void __init omap2_gp_clocksource_init(void) -{ - omap_init_clocksource_32k(); -} - -#else -/* - * clocksource - */ -static DEFINE_CLOCK_DATA(cd); -static struct omap_dm_timer *gpt_clocksource; -static cycle_t clocksource_read_cycles(struct clocksource *cs) -{ - 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), - .flags = CLOCK_SOURCE_IS_CONTINUOUS, -}; - -static void notrace dmtimer_update_sched_clock(void) -{ - u32 cyc; - - cyc = omap_dm_timer_read_counter(gpt_clocksource); - - update_sched_clock(&cd, cyc, (u32)~0); -} - -/* Setup free-running counter for clocksource */ -static void __init omap2_gp_clocksource_init(void) -{ - static struct omap_dm_timer *gpt; - u32 tick_rate; - 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)); - - omap_dm_timer_set_load_start(gpt, 1, 0); - - init_sched_clock(&cd, dmtimer_update_sched_clock, 32, tick_rate); - - if (clocksource_register_hz(&clocksource_gpt, tick_rate)) - printk(err2, clocksource_gpt.name); -} -#endif - -static void __init omap2_gp_timer_init(void) -{ -#ifdef CONFIG_LOCAL_TIMERS - if (cpu_is_omap44xx()) { - twd_base = ioremap(OMAP44XX_LOCAL_TWD_BASE, SZ_256); - BUG_ON(!twd_base); - } -#endif - omap_dm_timer_init(); - - omap2_gp_clockevent_init(); - omap2_gp_clocksource_init(); -} - -struct sys_timer omap_timer = { - .init = omap2_gp_timer_init, -}; |