diff options
Diffstat (limited to 'arch/arm/mach-mx3/time.c')
| -rw-r--r-- | arch/arm/mach-mx3/time.c | 148 |
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 fb565c98dbfb..000000000000 --- a/arch/arm/mach-mx3/time.c +++ /dev/null | |||
| @@ -1,148 +0,0 @@ | |||
| 1 | /* | ||
| 2 | * System Timer Interrupt reconfigured to run in free-run mode. | ||
| 3 | * Author: Vitaly Wool | ||
| 4 | * Copyright 2004 MontaVista Software Inc. | ||
| 5 | * Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved. | ||
| 6 | */ | ||
| 7 | |||
| 8 | /* | ||
| 9 | * This program is free software; you can redistribute it and/or modify | ||
| 10 | * it under the terms of the GNU General Public License version 2 as | ||
| 11 | * published by the Free Software Foundation. | ||
| 12 | */ | ||
| 13 | |||
| 14 | /*! | ||
| 15 | * @file time.c | ||
| 16 | * @brief This file contains OS tick and wdog timer implementations. | ||
| 17 | * | ||
| 18 | * This file contains OS tick and wdog timer implementations. | ||
| 19 | * | ||
| 20 | * @ingroup Timers | ||
| 21 | */ | ||
| 22 | |||
| 23 | #include <linux/module.h> | ||
| 24 | #include <linux/init.h> | ||
| 25 | #include <linux/interrupt.h> | ||
| 26 | #include <linux/irq.h> | ||
| 27 | #include <asm/hardware.h> | ||
| 28 | #include <asm/mach/time.h> | ||
| 29 | #include <asm/io.h> | ||
| 30 | #include <asm/arch/common.h> | ||
| 31 | |||
| 32 | /*! | ||
| 33 | * This is the timer interrupt service routine to do required tasks. | ||
| 34 | * It also services the WDOG timer at the frequency of twice per WDOG | ||
| 35 | * timeout value. For example, if the WDOG's timeout value is 4 (2 | ||
| 36 | * seconds since the WDOG runs at 0.5Hz), it will be serviced once | ||
| 37 | * every 2/2=1 second. | ||
| 38 | * | ||
| 39 | * @param irq GPT interrupt source number (not used) | ||
| 40 | * @param dev_id this parameter is not used | ||
| 41 | * @return always returns \b IRQ_HANDLED as defined in | ||
| 42 | * include/linux/interrupt.h. | ||
| 43 | */ | ||
| 44 | static irqreturn_t mxc_timer_interrupt(int irq, void *dev_id) | ||
| 45 | { | ||
| 46 | unsigned int next_match; | ||
| 47 | |||
| 48 | if (__raw_readl(MXC_GPT_GPTSR) & GPTSR_OF1) { | ||
| 49 | do { | ||
| 50 | timer_tick(); | ||
| 51 | next_match = __raw_readl(MXC_GPT_GPTOCR1) + LATCH; | ||
| 52 | __raw_writel(GPTSR_OF1, MXC_GPT_GPTSR); | ||
| 53 | __raw_writel(next_match, MXC_GPT_GPTOCR1); | ||
| 54 | } while ((signed long)(next_match - | ||
| 55 | __raw_readl(MXC_GPT_GPTCNT)) <= 0); | ||
| 56 | } | ||
| 57 | |||
| 58 | return IRQ_HANDLED; | ||
| 59 | } | ||
| 60 | |||
| 61 | /*! | ||
| 62 | * This function is used to obtain the number of microseconds since the last | ||
| 63 | * timer interrupt. Note that interrupts is disabled by do_gettimeofday(). | ||
| 64 | * | ||
| 65 | * @return the number of microseconds since the last timer interrupt. | ||
| 66 | */ | ||
| 67 | static unsigned long mxc_gettimeoffset(void) | ||
| 68 | { | ||
| 69 | unsigned long ticks_to_match, elapsed, usec, tick_usec, i; | ||
| 70 | |||
| 71 | /* Get ticks before next timer match */ | ||
| 72 | ticks_to_match = | ||
| 73 | __raw_readl(MXC_GPT_GPTOCR1) - __raw_readl(MXC_GPT_GPTCNT); | ||
| 74 | |||
| 75 | /* We need elapsed ticks since last match */ | ||
| 76 | elapsed = LATCH - ticks_to_match; | ||
| 77 | |||
| 78 | /* Now convert them to usec */ | ||
| 79 | /* Insure no overflow when calculating the usec below */ | ||
| 80 | for (i = 1, tick_usec = tick_nsec / 1000;; i *= 2) { | ||
| 81 | tick_usec /= i; | ||
| 82 | if ((0xFFFFFFFF / tick_usec) > elapsed) | ||
| 83 | break; | ||
| 84 | } | ||
| 85 | usec = (unsigned long)(elapsed * tick_usec) / (LATCH / i); | ||
| 86 | |||
| 87 | return usec; | ||
| 88 | } | ||
| 89 | |||
| 90 | /*! | ||
| 91 | * The OS tick timer interrupt structure. | ||
| 92 | */ | ||
| 93 | static struct irqaction timer_irq = { | ||
| 94 | .name = "MXC Timer Tick", | ||
| 95 | .flags = IRQF_DISABLED | IRQF_TIMER, | ||
| 96 | .handler = mxc_timer_interrupt | ||
| 97 | }; | ||
| 98 | |||
| 99 | /*! | ||
| 100 | * This function is used to initialize the GPT to produce an interrupt | ||
| 101 | * based on HZ. It is called by start_kernel() during system startup. | ||
| 102 | */ | ||
| 103 | void __init mxc_init_time(void) | ||
| 104 | { | ||
| 105 | u32 reg, v; | ||
| 106 | reg = __raw_readl(MXC_GPT_GPTCR); | ||
| 107 | reg &= ~GPTCR_ENABLE; | ||
| 108 | __raw_writel(reg, MXC_GPT_GPTCR); | ||
| 109 | reg |= GPTCR_SWR; | ||
| 110 | __raw_writel(reg, MXC_GPT_GPTCR); | ||
| 111 | |||
| 112 | while ((__raw_readl(MXC_GPT_GPTCR) & GPTCR_SWR) != 0) | ||
| 113 | cpu_relax(); | ||
| 114 | |||
| 115 | reg = GPTCR_FRR | GPTCR_CLKSRC_HIGHFREQ; | ||
| 116 | __raw_writel(reg, MXC_GPT_GPTCR); | ||
| 117 | |||
| 118 | /* TODO: get timer rate from clk driver */ | ||
| 119 | v = 66500000; | ||
| 120 | |||
| 121 | __raw_writel((v / CLOCK_TICK_RATE) - 1, MXC_GPT_GPTPR); | ||
| 122 | |||
| 123 | if ((v % CLOCK_TICK_RATE) != 0) { | ||
| 124 | pr_info("\nWARNING: Can't generate CLOCK_TICK_RATE at %d Hz\n", | ||
| 125 | CLOCK_TICK_RATE); | ||
| 126 | } | ||
| 127 | pr_info("Actual CLOCK_TICK_RATE is %d Hz\n", | ||
| 128 | v / ((__raw_readl(MXC_GPT_GPTPR) & 0xFFF) + 1)); | ||
| 129 | |||
| 130 | reg = __raw_readl(MXC_GPT_GPTCNT); | ||
| 131 | reg += LATCH; | ||
| 132 | __raw_writel(reg, MXC_GPT_GPTOCR1); | ||
| 133 | |||
| 134 | setup_irq(MXC_INT_GPT, &timer_irq); | ||
| 135 | |||
| 136 | reg = __raw_readl(MXC_GPT_GPTCR); | ||
| 137 | reg = | ||
| 138 | GPTCR_FRR | GPTCR_CLKSRC_HIGHFREQ | GPTCR_STOPEN | GPTCR_DOZEN | | ||
| 139 | GPTCR_WAITEN | GPTCR_ENMOD | GPTCR_ENABLE; | ||
| 140 | __raw_writel(reg, MXC_GPT_GPTCR); | ||
| 141 | |||
| 142 | __raw_writel(GPTIR_OF1IE, MXC_GPT_GPTIR); | ||
| 143 | } | ||
| 144 | |||
| 145 | struct sys_timer mxc_timer = { | ||
| 146 | .init = mxc_init_time, | ||
| 147 | .offset = mxc_gettimeoffset, | ||
| 148 | }; | ||