77900a2fc3
Port dmtimer framework to OMAP2. Modify the dmtimers API to support setting of PWM configuration and prescaler. Convert 32 kHz timer and GP timer to use the dmtimer framework. Signed-off-by: Timo Teras <timo.teras@solidboot.com> Signed-off-by: Juha Yrjola <juha.yrjola@solidboot.com> Signed-off-by: Tony Lindgren <tony@atomide.com>
78 lines
1.9 KiB
C
78 lines
1.9 KiB
C
/*
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* linux/arch/arm/mach-omap2/timer-gp.c
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*
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* OMAP2 GP timer support.
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*
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* Copyright (C) 2005 Nokia Corporation
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* Author: Paul Mundt <paul.mundt@nokia.com>
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* Juha Yrjölä <juha.yrjola@nokia.com>
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* OMAP Dual-mode timer framework support by Timo Teras
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*
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* Some parts based off of TI's 24xx code:
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*
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* Copyright (C) 2004 Texas Instruments, Inc.
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*
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* Roughly modelled after the OMAP1 MPU timer code.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/init.h>
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#include <linux/time.h>
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#include <linux/interrupt.h>
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#include <linux/err.h>
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <asm/mach/time.h>
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#include <asm/arch/dmtimer.h>
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static struct omap_dm_timer *gptimer;
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static inline void omap2_gp_timer_start(unsigned long load_val)
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{
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omap_dm_timer_set_load(gptimer, 1, 0xffffffff - load_val);
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omap_dm_timer_set_int_enable(gptimer, OMAP_TIMER_INT_OVERFLOW);
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omap_dm_timer_start(gptimer);
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}
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static irqreturn_t omap2_gp_timer_interrupt(int irq, void *dev_id,
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struct pt_regs *regs)
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{
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write_seqlock(&xtime_lock);
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omap_dm_timer_write_status(gptimer, OMAP_TIMER_INT_OVERFLOW);
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timer_tick(regs);
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write_sequnlock(&xtime_lock);
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return IRQ_HANDLED;
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}
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static struct irqaction omap2_gp_timer_irq = {
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.name = "gp timer",
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.flags = SA_INTERRUPT | SA_TIMER,
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.handler = omap2_gp_timer_interrupt,
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};
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static void __init omap2_gp_timer_init(void)
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{
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u32 tick_period;
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omap_dm_timer_init();
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gptimer = omap_dm_timer_request_specific(2);
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BUG_ON(gptimer == NULL);
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omap_dm_timer_set_source(gptimer, OMAP_TIMER_SRC_SYS_CLK);
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tick_period = clk_get_rate(omap_dm_timer_get_fclk(gptimer)) / 100;
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tick_period -= 1;
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setup_irq(omap_dm_timer_get_irq(gptimer), &omap2_gp_timer_irq);
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omap2_gp_timer_start(tick_period);
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}
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struct sys_timer omap_timer = {
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.init = omap2_gp_timer_init,
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};
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