Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /***************************************************************************/ |
| 2 | |
| 3 | /* |
| 4 | * timers.c -- generic ColdFire hardware timer support. |
| 5 | * |
Greg Ungerer | deb77c8 | 2006-12-06 11:36:59 +1000 | [diff] [blame] | 6 | * Copyright (C) 1999-2006, Greg Ungerer (gerg@snapgear.com) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | */ |
| 8 | |
| 9 | /***************************************************************************/ |
| 10 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #include <linux/kernel.h> |
| 12 | #include <linux/sched.h> |
| 13 | #include <linux/param.h> |
| 14 | #include <linux/interrupt.h> |
| 15 | #include <linux/init.h> |
Greg Ungerer | 0b7ac8e | 2006-06-26 10:33:10 +1000 | [diff] [blame] | 16 | #include <asm/io.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <asm/irq.h> |
| 18 | #include <asm/traps.h> |
| 19 | #include <asm/machdep.h> |
| 20 | #include <asm/coldfire.h> |
| 21 | #include <asm/mcftimer.h> |
| 22 | #include <asm/mcfsim.h> |
| 23 | |
| 24 | /***************************************************************************/ |
| 25 | |
| 26 | /* |
Greg Ungerer | 0b7ac8e | 2006-06-26 10:33:10 +1000 | [diff] [blame] | 27 | * By default use timer1 as the system clock timer. |
| 28 | */ |
| 29 | #define TA(a) (MCF_MBAR + MCFTIMER_BASE1 + (a)) |
| 30 | |
| 31 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | * Default the timer and vector to use for ColdFire. Some ColdFire |
| 33 | * CPU's and some boards may want different. Their sub-architecture |
| 34 | * startup code (in config.c) can change these if they want. |
| 35 | */ |
| 36 | unsigned int mcf_timervector = 29; |
| 37 | unsigned int mcf_profilevector = 31; |
| 38 | unsigned int mcf_timerlevel = 5; |
| 39 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | /* |
| 41 | * These provide the underlying interrupt vector support. |
| 42 | * Unfortunately it is a little different on each ColdFire. |
| 43 | */ |
| 44 | extern void mcf_settimericr(int timer, int level); |
| 45 | extern int mcf_timerirqpending(int timer); |
| 46 | |
Greg Ungerer | deb77c8 | 2006-12-06 11:36:59 +1000 | [diff] [blame] | 47 | #if defined(CONFIG_M532x) |
| 48 | #define __raw_readtrr __raw_readl |
| 49 | #define __raw_writetrr __raw_writel |
| 50 | #else |
| 51 | #define __raw_readtrr __raw_readw |
| 52 | #define __raw_writetrr __raw_writew |
| 53 | #endif |
| 54 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | /***************************************************************************/ |
| 56 | |
| 57 | void coldfire_tick(void) |
| 58 | { |
| 59 | /* Reset the ColdFire timer */ |
Greg Ungerer | 0b7ac8e | 2006-06-26 10:33:10 +1000 | [diff] [blame] | 60 | __raw_writeb(MCFTIMER_TER_CAP | MCFTIMER_TER_REF, TA(MCFTIMER_TER)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | } |
| 62 | |
| 63 | /***************************************************************************/ |
| 64 | |
Greg Ungerer | 4342f4a | 2007-06-08 13:46:39 -0700 | [diff] [blame^] | 65 | static int ticks_per_intr; |
| 66 | |
Greg Ungerer | c051b01 | 2007-02-07 12:03:01 +1000 | [diff] [blame] | 67 | void coldfire_timer_init(irq_handler_t handler) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | { |
Greg Ungerer | 0b7ac8e | 2006-06-26 10:33:10 +1000 | [diff] [blame] | 69 | __raw_writew(MCFTIMER_TMR_DISABLE, TA(MCFTIMER_TMR)); |
Greg Ungerer | 4342f4a | 2007-06-08 13:46:39 -0700 | [diff] [blame^] | 70 | ticks_per_intr = (MCF_BUSCLK / 16) / HZ; |
| 71 | __raw_writetrr(ticks_per_intr - 1, TA(MCFTIMER_TRR)); |
Greg Ungerer | 0b7ac8e | 2006-06-26 10:33:10 +1000 | [diff] [blame] | 72 | __raw_writew(MCFTIMER_TMR_ENORI | MCFTIMER_TMR_CLK16 | |
| 73 | MCFTIMER_TMR_RESTART | MCFTIMER_TMR_ENABLE, TA(MCFTIMER_TMR)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | |
Thomas Gleixner | f6f2388 | 2006-07-01 19:29:18 -0700 | [diff] [blame] | 75 | request_irq(mcf_timervector, handler, IRQF_DISABLED, "timer", NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | mcf_settimericr(1, mcf_timerlevel); |
| 77 | |
| 78 | #ifdef CONFIG_HIGHPROFILE |
| 79 | coldfire_profile_init(); |
| 80 | #endif |
| 81 | } |
| 82 | |
| 83 | /***************************************************************************/ |
| 84 | |
| 85 | unsigned long coldfire_timer_offset(void) |
| 86 | { |
Greg Ungerer | 4342f4a | 2007-06-08 13:46:39 -0700 | [diff] [blame^] | 87 | unsigned long tcn, offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | |
Greg Ungerer | 0b7ac8e | 2006-06-26 10:33:10 +1000 | [diff] [blame] | 89 | tcn = __raw_readw(TA(MCFTIMER_TCN)); |
Greg Ungerer | 4342f4a | 2007-06-08 13:46:39 -0700 | [diff] [blame^] | 90 | offset = ((tcn + 1) * (1000000 / HZ)) / ticks_per_intr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | |
| 92 | /* Check if we just wrapped the counters and maybe missed a tick */ |
| 93 | if ((offset < (1000000 / HZ / 2)) && mcf_timerirqpending(1)) |
| 94 | offset += 1000000 / HZ; |
| 95 | return offset; |
| 96 | } |
| 97 | |
| 98 | /***************************************************************************/ |
| 99 | #ifdef CONFIG_HIGHPROFILE |
| 100 | /***************************************************************************/ |
| 101 | |
| 102 | /* |
Greg Ungerer | 0b7ac8e | 2006-06-26 10:33:10 +1000 | [diff] [blame] | 103 | * By default use timer2 as the profiler clock timer. |
| 104 | */ |
| 105 | #define PA(a) (MCF_MBAR + MCFTIMER_BASE2 + (a)) |
| 106 | |
| 107 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | * Choose a reasonably fast profile timer. Make it an odd value to |
Robert P. J. Day | d08df60 | 2007-02-17 19:07:33 +0100 | [diff] [blame] | 109 | * try and get good coverage of kernel operations. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | */ |
| 111 | #define PROFILEHZ 1013 |
| 112 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | /* |
| 114 | * Use the other timer to provide high accuracy profiling info. |
| 115 | */ |
Greg Ungerer | c051b01 | 2007-02-07 12:03:01 +1000 | [diff] [blame] | 116 | irqreturn_t coldfire_profile_tick(int irq, void *dummy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | { |
| 118 | /* Reset ColdFire timer2 */ |
Greg Ungerer | 0b7ac8e | 2006-06-26 10:33:10 +1000 | [diff] [blame] | 119 | __raw_writeb(MCFTIMER_TER_CAP | MCFTIMER_TER_REF, PA(MCFTIMER_TER)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | if (current->pid) |
| 121 | profile_tick(CPU_PROFILING, regs); |
Greg Ungerer | c051b01 | 2007-02-07 12:03:01 +1000 | [diff] [blame] | 122 | return IRQ_HANDLED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | } |
| 124 | |
| 125 | /***************************************************************************/ |
| 126 | |
| 127 | void coldfire_profile_init(void) |
| 128 | { |
| 129 | printk(KERN_INFO "PROFILE: lodging TIMER2 @ %dHz as profile timer\n", PROFILEHZ); |
| 130 | |
| 131 | /* Set up TIMER 2 as high speed profile clock */ |
Greg Ungerer | 0b7ac8e | 2006-06-26 10:33:10 +1000 | [diff] [blame] | 132 | __raw_writew(MCFTIMER_TMR_DISABLE, PA(MCFTIMER_TMR)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | |
Greg Ungerer | deb77c8 | 2006-12-06 11:36:59 +1000 | [diff] [blame] | 134 | __raw_writetrr(((MCF_CLK / 16) / PROFILEHZ), PA(MCFTIMER_TRR)); |
Greg Ungerer | 0b7ac8e | 2006-06-26 10:33:10 +1000 | [diff] [blame] | 135 | __raw_writew(MCFTIMER_TMR_ENORI | MCFTIMER_TMR_CLK16 | |
| 136 | MCFTIMER_TMR_RESTART | MCFTIMER_TMR_ENABLE, PA(MCFTIMER_TMR)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | |
| 138 | request_irq(mcf_profilevector, coldfire_profile_tick, |
Thomas Gleixner | f6f2388 | 2006-07-01 19:29:18 -0700 | [diff] [blame] | 139 | (IRQF_DISABLED | IRQ_FLG_FAST), "profile timer", NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | mcf_settimericr(2, 7); |
| 141 | } |
| 142 | |
| 143 | /***************************************************************************/ |
| 144 | #endif /* CONFIG_HIGHPROFILE */ |
| 145 | /***************************************************************************/ |