Aubrey Li | 51185db | 2007-03-20 18:16:24 +0800 | [diff] [blame] | 1 | /* |
| 2 | * U-boot - interrupts.c Interrupt related routines |
| 3 | * |
Mike Frysinger | 94bae5c | 2008-03-30 15:46:13 -0400 | [diff] [blame] | 4 | * Copyright (c) 2005-2008 Analog Devices Inc. |
Aubrey Li | 51185db | 2007-03-20 18:16:24 +0800 | [diff] [blame] | 5 | * |
| 6 | * This file is based on interrupts.c |
| 7 | * Copyright 1996 Roman Zippel |
| 8 | * Copyright 1999 D. Jeff Dionne <jeff@uclinux.org> |
| 9 | * Copyright 2000-2001 Lineo, Inc. D. Jefff Dionne <jeff@lineo.ca> |
| 10 | * Copyright 2002 Arcturus Networks Inc. MaTed <mated@sympatico.ca> |
| 11 | * Copyright 2003 Metrowerks/Motorola |
| 12 | * Copyright 2003 Bas Vermeulen <bas@buyways.nl>, |
| 13 | * BuyWays B.V. (www.buyways.nl) |
| 14 | * |
| 15 | * (C) Copyright 2000-2004 |
| 16 | * Wolfgang Denk, DENX Software Engineering, wd@denx.de. |
Aubrey Li | 51185db | 2007-03-20 18:16:24 +0800 | [diff] [blame] | 17 | * |
Mike Frysinger | 94bae5c | 2008-03-30 15:46:13 -0400 | [diff] [blame] | 18 | * Licensed under the GPL-2 or later. |
Aubrey Li | 51185db | 2007-03-20 18:16:24 +0800 | [diff] [blame] | 19 | */ |
| 20 | |
| 21 | #include <common.h> |
Aubrey Li | 51185db | 2007-03-20 18:16:24 +0800 | [diff] [blame] | 22 | #include <config.h> |
| 23 | #include <asm/blackfin.h> |
| 24 | #include "cpu.h" |
| 25 | |
| 26 | static ulong timestamp; |
| 27 | static ulong last_time; |
| 28 | static int int_flag; |
| 29 | |
| 30 | int irq_flags; /* needed by asm-blackfin/system.h */ |
| 31 | |
| 32 | /* Functions just to satisfy the linker */ |
| 33 | |
| 34 | /* |
| 35 | * This function is derived from PowerPC code (read timebase as long long). |
Mike Frysinger | 94bae5c | 2008-03-30 15:46:13 -0400 | [diff] [blame] | 36 | * On Blackfin it just returns the timer value. |
Aubrey Li | 51185db | 2007-03-20 18:16:24 +0800 | [diff] [blame] | 37 | */ |
| 38 | unsigned long long get_ticks(void) |
| 39 | { |
| 40 | return get_timer(0); |
| 41 | } |
| 42 | |
| 43 | /* |
| 44 | * This function is derived from PowerPC code (timebase clock frequency). |
Mike Frysinger | 94bae5c | 2008-03-30 15:46:13 -0400 | [diff] [blame] | 45 | * On Blackfin it returns the number of timer ticks per second. |
Aubrey Li | 51185db | 2007-03-20 18:16:24 +0800 | [diff] [blame] | 46 | */ |
| 47 | ulong get_tbclk(void) |
| 48 | { |
| 49 | ulong tbclk; |
| 50 | |
| 51 | tbclk = CFG_HZ; |
| 52 | return tbclk; |
| 53 | } |
| 54 | |
| 55 | void enable_interrupts(void) |
| 56 | { |
Mike Frysinger | 94bae5c | 2008-03-30 15:46:13 -0400 | [diff] [blame] | 57 | local_irq_restore(int_flag); |
Aubrey Li | 51185db | 2007-03-20 18:16:24 +0800 | [diff] [blame] | 58 | } |
| 59 | |
| 60 | int disable_interrupts(void) |
| 61 | { |
Mike Frysinger | 94bae5c | 2008-03-30 15:46:13 -0400 | [diff] [blame] | 62 | local_irq_save(int_flag); |
Aubrey Li | 51185db | 2007-03-20 18:16:24 +0800 | [diff] [blame] | 63 | return 1; |
| 64 | } |
| 65 | |
Aubrey Li | 51185db | 2007-03-20 18:16:24 +0800 | [diff] [blame] | 66 | void udelay(unsigned long usec) |
| 67 | { |
| 68 | unsigned long delay, start, stop; |
| 69 | unsigned long cclk; |
| 70 | cclk = (CONFIG_CCLK_HZ); |
| 71 | |
| 72 | while (usec > 1) { |
| 73 | /* |
| 74 | * how many clock ticks to delay? |
| 75 | * - request(in useconds) * clock_ticks(Hz) / useconds/second |
| 76 | */ |
| 77 | if (usec < 1000) { |
| 78 | delay = (usec * (cclk / 244)) >> 12; |
| 79 | usec = 0; |
| 80 | } else { |
| 81 | delay = (1000 * (cclk / 244)) >> 12; |
| 82 | usec -= 1000; |
| 83 | } |
| 84 | |
Mike Frysinger | 94bae5c | 2008-03-30 15:46:13 -0400 | [diff] [blame] | 85 | asm volatile (" %0 = CYCLES;" : "=r" (start)); |
Aubrey Li | 51185db | 2007-03-20 18:16:24 +0800 | [diff] [blame] | 86 | do { |
Mike Frysinger | 94bae5c | 2008-03-30 15:46:13 -0400 | [diff] [blame] | 87 | asm volatile (" %0 = CYCLES; " : "=r" (stop)); |
Aubrey Li | 51185db | 2007-03-20 18:16:24 +0800 | [diff] [blame] | 88 | } while (stop - start < delay); |
| 89 | } |
| 90 | |
| 91 | return; |
| 92 | } |
| 93 | |
Mike Frysinger | 94bae5c | 2008-03-30 15:46:13 -0400 | [diff] [blame] | 94 | #define MAX_TIM_LOAD 0xFFFFFFFF |
| 95 | int timer_init(void) |
Aubrey Li | 51185db | 2007-03-20 18:16:24 +0800 | [diff] [blame] | 96 | { |
| 97 | *pTCNTL = 0x1; |
| 98 | *pTSCALE = 0x0; |
| 99 | *pTCOUNT = MAX_TIM_LOAD; |
| 100 | *pTPERIOD = MAX_TIM_LOAD; |
| 101 | *pTCNTL = 0x7; |
| 102 | asm("CSYNC;"); |
| 103 | |
| 104 | timestamp = 0; |
| 105 | last_time = 0; |
Mike Frysinger | 94bae5c | 2008-03-30 15:46:13 -0400 | [diff] [blame] | 106 | |
| 107 | return 0; |
Aubrey Li | 51185db | 2007-03-20 18:16:24 +0800 | [diff] [blame] | 108 | } |
| 109 | |
| 110 | /* |
| 111 | * Any network command or flash |
| 112 | * command is started get_timer shall |
| 113 | * be called before TCOUNT gets reset, |
| 114 | * to implement the accurate timeouts. |
| 115 | * |
| 116 | * How ever milliconds doesn't return |
| 117 | * the number that has been elapsed from |
| 118 | * the last reset. |
| 119 | * |
| 120 | * As get_timer is used in the u-boot |
| 121 | * only for timeouts this should be |
| 122 | * sufficient |
| 123 | */ |
| 124 | ulong get_timer(ulong base) |
| 125 | { |
| 126 | ulong milisec; |
| 127 | |
| 128 | /* Number of clocks elapsed */ |
| 129 | ulong clocks = (MAX_TIM_LOAD - (*pTCOUNT)); |
| 130 | |
| 131 | /* |
| 132 | * Find if the TCOUNT is reset |
| 133 | * timestamp gives the number of times |
| 134 | * TCOUNT got reset |
| 135 | */ |
| 136 | if (clocks < last_time) |
| 137 | timestamp++; |
| 138 | last_time = clocks; |
| 139 | |
| 140 | /* Get the number of milliseconds */ |
| 141 | milisec = clocks / (CONFIG_CCLK_HZ / 1000); |
| 142 | |
| 143 | /* |
Mike Frysinger | 94bae5c | 2008-03-30 15:46:13 -0400 | [diff] [blame] | 144 | * Find the number of millisonds that |
| 145 | * got elapsed before this TCOUNT cycle |
Aubrey Li | 51185db | 2007-03-20 18:16:24 +0800 | [diff] [blame] | 146 | */ |
| 147 | milisec += timestamp * (MAX_TIM_LOAD / (CONFIG_CCLK_HZ / 1000)); |
| 148 | |
| 149 | return (milisec - base); |
| 150 | } |
Mike Frysinger | 94bae5c | 2008-03-30 15:46:13 -0400 | [diff] [blame] | 151 | |
| 152 | void reset_timer(void) |
| 153 | { |
| 154 | timestamp = 0; |
| 155 | } |