Jens Scharsig | 9bbaae3 | 2010-02-03 22:47:35 +0100 | [diff] [blame] | 1 | /* |
| 2 | * (C) Copyright 2002 |
| 3 | * Lineo, Inc. <www.lineo.com> |
| 4 | * Bernhard Kuhn <bkuhn@lineo.com> |
| 5 | * |
| 6 | * (C) Copyright 2002 |
| 7 | * Sysgo Real-Time Solutions, GmbH <www.elinos.com> |
| 8 | * Marius Groeger <mgroeger@sysgo.de> |
| 9 | * |
| 10 | * (C) Copyright 2002 |
| 11 | * Sysgo Real-Time Solutions, GmbH <www.elinos.com> |
| 12 | * Alex Zuepke <azu@sysgo.de> |
| 13 | * |
| 14 | * See file CREDITS for list of people who contributed to this |
| 15 | * project. |
| 16 | * |
| 17 | * This program is free software; you can redistribute it and/or |
| 18 | * modify it under the terms of the GNU General Public License as |
| 19 | * published by the Free Software Foundation; either version 2 of |
| 20 | * the License, or (at your option) any later version. |
| 21 | * |
| 22 | * This program is distributed in the hope that it will be useful, |
| 23 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 24 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 25 | * GNU General Public License for more details. |
| 26 | * |
| 27 | * You should have received a copy of the GNU General Public License |
| 28 | * along with this program; if not, write to the Free Software |
| 29 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| 30 | * MA 02111-1307 USA |
| 31 | */ |
| 32 | |
| 33 | #include <common.h> |
| 34 | |
Jens Scharsig | 58aa563 | 2011-02-19 06:17:02 +0000 | [diff] [blame] | 35 | #include <asm/io.h> |
Andreas Bießmann | 20e3029 | 2010-11-30 09:45:06 +0000 | [diff] [blame] | 36 | #include <asm/arch/hardware.h> |
Jens Scharsig | 9bbaae3 | 2010-02-03 22:47:35 +0100 | [diff] [blame] | 37 | #include <asm/arch/at91_tc.h> |
| 38 | #include <asm/arch/at91_pmc.h> |
| 39 | |
Andreas Bießmann | 20e3029 | 2010-11-30 09:45:06 +0000 | [diff] [blame] | 40 | DECLARE_GLOBAL_DATA_PTR; |
| 41 | |
Jens Scharsig | 9bbaae3 | 2010-02-03 22:47:35 +0100 | [diff] [blame] | 42 | /* the number of clocks per CONFIG_SYS_HZ */ |
| 43 | #define TIMER_LOAD_VAL (CONFIG_SYS_HZ_CLOCK/CONFIG_SYS_HZ) |
| 44 | |
Jens Scharsig | 9bbaae3 | 2010-02-03 22:47:35 +0100 | [diff] [blame] | 45 | int timer_init(void) |
| 46 | { |
Jens Scharsig | 58aa563 | 2011-02-19 06:17:02 +0000 | [diff] [blame] | 47 | at91_tc_t *tc = (at91_tc_t *) ATMEL_BASE_TC; |
| 48 | at91_pmc_t *pmc = (at91_pmc_t *) ATMEL_BASE_PMC; |
Jens Scharsig | 9bbaae3 | 2010-02-03 22:47:35 +0100 | [diff] [blame] | 49 | |
| 50 | /* enables TC1.0 clock */ |
Jens Scharsig | 58aa563 | 2011-02-19 06:17:02 +0000 | [diff] [blame] | 51 | writel(1 << ATMEL_ID_TC0, &pmc->pcer); /* enable clock */ |
Jens Scharsig | 9bbaae3 | 2010-02-03 22:47:35 +0100 | [diff] [blame] | 52 | |
| 53 | writel(0, &tc->bcr); |
| 54 | writel(AT91_TC_BMR_TC0XC0S_NONE | AT91_TC_BMR_TC1XC1S_NONE | |
| 55 | AT91_TC_BMR_TC2XC2S_NONE , &tc->bmr); |
| 56 | |
| 57 | writel(AT91_TC_CCR_CLKDIS, &tc->tc[0].ccr); |
| 58 | /* set to MCLK/2 and restart the timer |
| 59 | when the value in TC_RC is reached */ |
| 60 | writel(AT91_TC_CMR_TCCLKS_CLOCK1 | AT91_TC_CMR_CPCTRG, &tc->tc[0].cmr); |
| 61 | |
Mike Williams | bf895ad | 2011-07-22 04:01:30 +0000 | [diff] [blame] | 62 | writel(0xFFFFFFFF, &tc->tc[0].idr); /* disable interrupts */ |
Jens Scharsig | 9bbaae3 | 2010-02-03 22:47:35 +0100 | [diff] [blame] | 63 | writel(TIMER_LOAD_VAL, &tc->tc[0].rc); |
| 64 | |
| 65 | writel(AT91_TC_CCR_SWTRG | AT91_TC_CCR_CLKEN, &tc->tc[0].ccr); |
Andreas Bießmann | 20e3029 | 2010-11-30 09:45:06 +0000 | [diff] [blame] | 66 | gd->lastinc = 0; |
| 67 | gd->tbl = 0; |
Jens Scharsig | 9bbaae3 | 2010-02-03 22:47:35 +0100 | [diff] [blame] | 68 | |
| 69 | return 0; |
| 70 | } |
| 71 | |
| 72 | /* |
| 73 | * timer without interrupts |
| 74 | */ |
Jens Scharsig | 9bbaae3 | 2010-02-03 22:47:35 +0100 | [diff] [blame] | 75 | ulong get_timer(ulong base) |
| 76 | { |
| 77 | return get_timer_masked() - base; |
| 78 | } |
| 79 | |
Jens Scharsig | 9bbaae3 | 2010-02-03 22:47:35 +0100 | [diff] [blame] | 80 | void __udelay(unsigned long usec) |
| 81 | { |
| 82 | udelay_masked(usec); |
| 83 | } |
| 84 | |
Jens Scharsig | 9bbaae3 | 2010-02-03 22:47:35 +0100 | [diff] [blame] | 85 | ulong get_timer_raw(void) |
| 86 | { |
Jens Scharsig | 58aa563 | 2011-02-19 06:17:02 +0000 | [diff] [blame] | 87 | at91_tc_t *tc = (at91_tc_t *) ATMEL_BASE_TC; |
Jens Scharsig | 9bbaae3 | 2010-02-03 22:47:35 +0100 | [diff] [blame] | 88 | u32 now; |
| 89 | |
| 90 | now = readl(&tc->tc[0].cv) & 0x0000ffff; |
| 91 | |
Andreas Bießmann | 20e3029 | 2010-11-30 09:45:06 +0000 | [diff] [blame] | 92 | if (now >= gd->lastinc) { |
Jens Scharsig | 9bbaae3 | 2010-02-03 22:47:35 +0100 | [diff] [blame] | 93 | /* normal mode */ |
Andreas Bießmann | 20e3029 | 2010-11-30 09:45:06 +0000 | [diff] [blame] | 94 | gd->tbl += now - gd->lastinc; |
Jens Scharsig | 9bbaae3 | 2010-02-03 22:47:35 +0100 | [diff] [blame] | 95 | } else { |
| 96 | /* we have an overflow ... */ |
Andreas Bießmann | 20e3029 | 2010-11-30 09:45:06 +0000 | [diff] [blame] | 97 | gd->tbl += now + TIMER_LOAD_VAL - gd->lastinc; |
Jens Scharsig | 9bbaae3 | 2010-02-03 22:47:35 +0100 | [diff] [blame] | 98 | } |
Andreas Bießmann | 20e3029 | 2010-11-30 09:45:06 +0000 | [diff] [blame] | 99 | gd->lastinc = now; |
Jens Scharsig | 9bbaae3 | 2010-02-03 22:47:35 +0100 | [diff] [blame] | 100 | |
Andreas Bießmann | 20e3029 | 2010-11-30 09:45:06 +0000 | [diff] [blame] | 101 | return gd->tbl; |
Jens Scharsig | 9bbaae3 | 2010-02-03 22:47:35 +0100 | [diff] [blame] | 102 | } |
| 103 | |
| 104 | ulong get_timer_masked(void) |
| 105 | { |
| 106 | return get_timer_raw()/TIMER_LOAD_VAL; |
| 107 | } |
| 108 | |
| 109 | void udelay_masked(unsigned long usec) |
| 110 | { |
| 111 | u32 tmo; |
| 112 | u32 endtime; |
| 113 | signed long diff; |
| 114 | |
| 115 | tmo = CONFIG_SYS_HZ_CLOCK / 1000; |
| 116 | tmo *= usec; |
| 117 | tmo /= 1000; |
| 118 | |
| 119 | endtime = get_timer_raw() + tmo; |
| 120 | |
| 121 | do { |
| 122 | u32 now = get_timer_raw(); |
| 123 | diff = endtime - now; |
| 124 | } while (diff >= 0); |
| 125 | } |
| 126 | |
| 127 | /* |
| 128 | * This function is derived from PowerPC code (read timebase as long long). |
| 129 | * On ARM it just returns the timer value. |
| 130 | */ |
| 131 | unsigned long long get_ticks(void) |
| 132 | { |
| 133 | return get_timer(0); |
| 134 | } |
| 135 | |
| 136 | /* |
| 137 | * This function is derived from PowerPC code (timebase clock frequency). |
| 138 | * On ARM it returns the number of timer ticks per second. |
| 139 | */ |
| 140 | ulong get_tbclk(void) |
| 141 | { |
| 142 | return CONFIG_SYS_HZ; |
| 143 | } |