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authorJuergen Beisert <j.beisert@pengutronix.de>2008-07-05 10:02:50 +0200
committerRobert Schwebel <r.schwebel@pengutronix.de>2008-07-05 10:02:50 +0200
commitd0f349fbce2905607e0473d2358f97f48866e52c (patch)
tree7b6892554648c4ab2eae4b29a054787399a49094 /arch/arm/mach-mx3/time.c
parent90292ea60f1c730efb9fea02b2e12676da89ebef (diff)
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i.MXC family: Adding timer support
This patch adds timer support for the i.MX machine family. This code can be used on the following machs: - i.MX1 (tested) - i.MX2 (i.MX21 (to be tested), i.MX27 (tested)) - i.MX3 (i.MX31 (tested)) TODO: It seems impossible to build a kernel for more than one CPU because the timer do not follow the platform device rules. So it does only work if timer 1 can be accessed on all CPUs at the same address. Signed-off-by: Juergen Beisert <j.beisert@pengutronix.de> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'arch/arm/mach-mx3/time.c')
-rw-r--r--arch/arm/mach-mx3/time.c148
1 files changed, 0 insertions, 148 deletions
diff --git a/arch/arm/mach-mx3/time.c b/arch/arm/mach-mx3/time.c
deleted file mode 100644
index fb565c9..0000000
--- a/arch/arm/mach-mx3/time.c
+++ /dev/null
@@ -1,148 +0,0 @@
-/*
- * System Timer Interrupt reconfigured to run in free-run mode.
- * Author: Vitaly Wool
- * Copyright 2004 MontaVista Software Inc.
- * Copyright 2004-2007 Freescale Semiconductor, Inc. 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.
- */
-
-/*!
- * @file time.c
- * @brief This file contains OS tick and wdog timer implementations.
- *
- * This file contains OS tick and wdog timer implementations.
- *
- * @ingroup Timers
- */
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/interrupt.h>
-#include <linux/irq.h>
-#include <asm/hardware.h>
-#include <asm/mach/time.h>
-#include <asm/io.h>
-#include <asm/arch/common.h>
-
-/*!
- * This is the timer interrupt service routine to do required tasks.
- * It also services the WDOG timer at the frequency of twice per WDOG
- * timeout value. For example, if the WDOG's timeout value is 4 (2
- * seconds since the WDOG runs at 0.5Hz), it will be serviced once
- * every 2/2=1 second.
- *
- * @param irq GPT interrupt source number (not used)
- * @param dev_id this parameter is not used
- * @return always returns \b IRQ_HANDLED as defined in
- * include/linux/interrupt.h.
- */
-static irqreturn_t mxc_timer_interrupt(int irq, void *dev_id)
-{
- unsigned int next_match;
-
- if (__raw_readl(MXC_GPT_GPTSR) & GPTSR_OF1) {
- do {
- timer_tick();
- next_match = __raw_readl(MXC_GPT_GPTOCR1) + LATCH;
- __raw_writel(GPTSR_OF1, MXC_GPT_GPTSR);
- __raw_writel(next_match, MXC_GPT_GPTOCR1);
- } while ((signed long)(next_match -
- __raw_readl(MXC_GPT_GPTCNT)) <= 0);
- }
-
- return IRQ_HANDLED;
-}
-
-/*!
- * This function is used to obtain the number of microseconds since the last
- * timer interrupt. Note that interrupts is disabled by do_gettimeofday().
- *
- * @return the number of microseconds since the last timer interrupt.
- */
-static unsigned long mxc_gettimeoffset(void)
-{
- unsigned long ticks_to_match, elapsed, usec, tick_usec, i;
-
- /* Get ticks before next timer match */
- ticks_to_match =
- __raw_readl(MXC_GPT_GPTOCR1) - __raw_readl(MXC_GPT_GPTCNT);
-
- /* We need elapsed ticks since last match */
- elapsed = LATCH - ticks_to_match;
-
- /* Now convert them to usec */
- /* Insure no overflow when calculating the usec below */
- for (i = 1, tick_usec = tick_nsec / 1000;; i *= 2) {
- tick_usec /= i;
- if ((0xFFFFFFFF / tick_usec) > elapsed)
- break;
- }
- usec = (unsigned long)(elapsed * tick_usec) / (LATCH / i);
-
- return usec;
-}
-
-/*!
- * The OS tick timer interrupt structure.
- */
-static struct irqaction timer_irq = {
- .name = "MXC Timer Tick",
- .flags = IRQF_DISABLED | IRQF_TIMER,
- .handler = mxc_timer_interrupt
-};
-
-/*!
- * This function is used to initialize the GPT to produce an interrupt
- * based on HZ. It is called by start_kernel() during system startup.
- */
-void __init mxc_init_time(void)
-{
- u32 reg, v;
- reg = __raw_readl(MXC_GPT_GPTCR);
- reg &= ~GPTCR_ENABLE;
- __raw_writel(reg, MXC_GPT_GPTCR);
- reg |= GPTCR_SWR;
- __raw_writel(reg, MXC_GPT_GPTCR);
-
- while ((__raw_readl(MXC_GPT_GPTCR) & GPTCR_SWR) != 0)
- cpu_relax();
-
- reg = GPTCR_FRR | GPTCR_CLKSRC_HIGHFREQ;
- __raw_writel(reg, MXC_GPT_GPTCR);
-
- /* TODO: get timer rate from clk driver */
- v = 66500000;
-
- __raw_writel((v / CLOCK_TICK_RATE) - 1, MXC_GPT_GPTPR);
-
- if ((v % CLOCK_TICK_RATE) != 0) {
- pr_info("\nWARNING: Can't generate CLOCK_TICK_RATE at %d Hz\n",
- CLOCK_TICK_RATE);
- }
- pr_info("Actual CLOCK_TICK_RATE is %d Hz\n",
- v / ((__raw_readl(MXC_GPT_GPTPR) & 0xFFF) + 1));
-
- reg = __raw_readl(MXC_GPT_GPTCNT);
- reg += LATCH;
- __raw_writel(reg, MXC_GPT_GPTOCR1);
-
- setup_irq(MXC_INT_GPT, &timer_irq);
-
- reg = __raw_readl(MXC_GPT_GPTCR);
- reg =
- GPTCR_FRR | GPTCR_CLKSRC_HIGHFREQ | GPTCR_STOPEN | GPTCR_DOZEN |
- GPTCR_WAITEN | GPTCR_ENMOD | GPTCR_ENABLE;
- __raw_writel(reg, MXC_GPT_GPTCR);
-
- __raw_writel(GPTIR_OF1IE, MXC_GPT_GPTIR);
-}
-
-struct sys_timer mxc_timer = {
- .init = mxc_init_time,
- .offset = mxc_gettimeoffset,
-};