Ilya Yanok | 416a41f | 2009-06-08 04:12:45 +0400 | [diff] [blame] | 1 | /* |
| 2 | * (C) Copyright 2002 |
| 3 | * Sysgo Real-Time Solutions, GmbH <www.elinos.com> |
| 4 | * Marius Groeger <mgroeger@sysgo.de> |
| 5 | * |
| 6 | * (C) Copyright 2002 |
| 7 | * Sysgo Real-Time Solutions, GmbH <www.elinos.com> |
| 8 | * Alex Zuepke <azu@sysgo.de> |
| 9 | * |
| 10 | * (C) Copyright 2002 |
| 11 | * Gary Jennejohn, DENX Software Engineering, <gj@denx.de> |
| 12 | * |
| 13 | * (C) Copyright 2009 |
| 14 | * Ilya Yanok, Emcraft Systems Ltd, <yanok@emcraft.com> |
| 15 | * |
Wolfgang Denk | d79de1d | 2013-07-08 09:37:19 +0200 | [diff] [blame] | 16 | * SPDX-License-Identifier: GPL-2.0+ |
Ilya Yanok | 416a41f | 2009-06-08 04:12:45 +0400 | [diff] [blame] | 17 | */ |
| 18 | |
| 19 | #include <common.h> |
| 20 | #include <div64.h> |
| 21 | #include <asm/io.h> |
| 22 | #include <asm/arch/imx-regs.h> |
| 23 | |
| 24 | /* General purpose timers bitfields */ |
| 25 | #define GPTCR_SWR (1 << 15) /* Software reset */ |
| 26 | #define GPTCR_FRR (1 << 8) /* Freerun / restart */ |
| 27 | #define GPTCR_CLKSOURCE_32 (4 << 1) /* Clock source */ |
| 28 | #define GPTCR_TEN 1 /* Timer enable */ |
| 29 | |
Heiko Schocher | 5504dab | 2011-01-20 22:56:39 +0000 | [diff] [blame] | 30 | DECLARE_GLOBAL_DATA_PTR; |
| 31 | |
Simon Glass | 2655ee1 | 2012-12-13 20:48:34 +0000 | [diff] [blame] | 32 | #define timestamp (gd->arch.tbl) |
Simon Glass | a848da5 | 2012-12-13 20:48:35 +0000 | [diff] [blame] | 33 | #define lastinc (gd->arch.lastinc) |
Ilya Yanok | 416a41f | 2009-06-08 04:12:45 +0400 | [diff] [blame] | 34 | |
| 35 | /* |
| 36 | * "time" is measured in 1 / CONFIG_SYS_HZ seconds, |
| 37 | * "tick" is internal timer period |
| 38 | */ |
| 39 | #ifdef CONFIG_MX27_TIMER_HIGH_PRECISION |
| 40 | /* ~0.4% error - measured with stop-watch on 100s boot-delay */ |
| 41 | static inline unsigned long long tick_to_time(unsigned long long tick) |
| 42 | { |
| 43 | tick *= CONFIG_SYS_HZ; |
| 44 | do_div(tick, CONFIG_MX27_CLK32); |
| 45 | return tick; |
| 46 | } |
| 47 | |
| 48 | static inline unsigned long long time_to_tick(unsigned long long time) |
| 49 | { |
| 50 | time *= CONFIG_MX27_CLK32; |
| 51 | do_div(time, CONFIG_SYS_HZ); |
| 52 | return time; |
| 53 | } |
| 54 | |
| 55 | static inline unsigned long long us_to_tick(unsigned long long us) |
| 56 | { |
| 57 | us = us * CONFIG_MX27_CLK32 + 999999; |
| 58 | do_div(us, 1000000); |
| 59 | return us; |
| 60 | } |
| 61 | #else |
| 62 | /* ~2% error */ |
| 63 | #define TICK_PER_TIME ((CONFIG_MX27_CLK32 + CONFIG_SYS_HZ / 2) / \ |
| 64 | CONFIG_SYS_HZ) |
| 65 | #define US_PER_TICK (1000000 / CONFIG_MX27_CLK32) |
| 66 | |
| 67 | static inline unsigned long long tick_to_time(unsigned long long tick) |
| 68 | { |
| 69 | do_div(tick, TICK_PER_TIME); |
| 70 | return tick; |
| 71 | } |
| 72 | |
| 73 | static inline unsigned long long time_to_tick(unsigned long long time) |
| 74 | { |
| 75 | return time * TICK_PER_TIME; |
| 76 | } |
| 77 | |
| 78 | static inline unsigned long long us_to_tick(unsigned long long us) |
| 79 | { |
| 80 | us += US_PER_TICK - 1; |
| 81 | do_div(us, US_PER_TICK); |
| 82 | return us; |
| 83 | } |
| 84 | #endif |
| 85 | |
| 86 | /* nothing really to do with interrupts, just starts up a counter. */ |
| 87 | /* The 32768Hz 32-bit timer overruns in 131072 seconds */ |
| 88 | int timer_init(void) |
| 89 | { |
| 90 | int i; |
| 91 | struct gpt_regs *regs = (struct gpt_regs *)IMX_TIM1_BASE; |
| 92 | struct pll_regs *pll = (struct pll_regs *)IMX_PLL_BASE; |
| 93 | |
| 94 | /* setup GP Timer 1 */ |
| 95 | writel(GPTCR_SWR, ®s->gpt_tctl); |
| 96 | |
| 97 | writel(readl(&pll->pccr0) | PCCR0_GPT1_EN, &pll->pccr0); |
| 98 | writel(readl(&pll->pccr1) | PCCR1_PERCLK1_EN, &pll->pccr1); |
| 99 | |
| 100 | for (i = 0; i < 100; i++) |
| 101 | writel(0, ®s->gpt_tctl); /* We have no udelay by now */ |
| 102 | writel(0, ®s->gpt_tprer); /* 32Khz */ |
| 103 | /* Freerun Mode, PERCLK1 input */ |
| 104 | writel(readl(®s->gpt_tctl) | GPTCR_CLKSOURCE_32 | GPTCR_FRR, |
| 105 | ®s->gpt_tctl); |
| 106 | writel(readl(®s->gpt_tctl) | GPTCR_TEN, ®s->gpt_tctl); |
| 107 | |
| 108 | return 0; |
| 109 | } |
| 110 | |
Fabio Estevam | f231efb | 2011-10-13 05:34:59 +0000 | [diff] [blame] | 111 | unsigned long long get_ticks(void) |
Ilya Yanok | 416a41f | 2009-06-08 04:12:45 +0400 | [diff] [blame] | 112 | { |
| 113 | struct gpt_regs *regs = (struct gpt_regs *)IMX_TIM1_BASE; |
| 114 | ulong now = readl(®s->gpt_tcn); /* current tick value */ |
| 115 | |
| 116 | if (now >= lastinc) { |
| 117 | /* |
| 118 | * normal mode (non roll) |
| 119 | * move stamp forward with absolut diff ticks |
| 120 | */ |
| 121 | timestamp += (now - lastinc); |
| 122 | } else { |
| 123 | /* we have rollover of incrementer */ |
| 124 | timestamp += (0xFFFFFFFF - lastinc) + now; |
| 125 | } |
| 126 | lastinc = now; |
| 127 | return timestamp; |
| 128 | } |
| 129 | |
Fabio Estevam | f231efb | 2011-10-13 05:34:59 +0000 | [diff] [blame] | 130 | ulong get_timer_masked(void) |
Ilya Yanok | 416a41f | 2009-06-08 04:12:45 +0400 | [diff] [blame] | 131 | { |
| 132 | /* |
| 133 | * get_ticks() returns a long long (64 bit), it wraps in |
| 134 | * 2^64 / CONFIG_MX27_CLK32 = 2^64 / 2^15 = 2^49 ~ 5 * 10^14 (s) ~ |
| 135 | * 5 * 10^9 days... and get_ticks() * CONFIG_SYS_HZ wraps in |
| 136 | * 5 * 10^6 days - long enough. |
| 137 | */ |
| 138 | return tick_to_time(get_ticks()); |
| 139 | } |
| 140 | |
Fabio Estevam | f231efb | 2011-10-13 05:34:59 +0000 | [diff] [blame] | 141 | ulong get_timer(ulong base) |
Ilya Yanok | 416a41f | 2009-06-08 04:12:45 +0400 | [diff] [blame] | 142 | { |
Fabio Estevam | f231efb | 2011-10-13 05:34:59 +0000 | [diff] [blame] | 143 | return get_timer_masked() - base; |
Ilya Yanok | 416a41f | 2009-06-08 04:12:45 +0400 | [diff] [blame] | 144 | } |
| 145 | |
Wolfgang Denk | 1d695be | 2009-07-07 22:35:02 +0200 | [diff] [blame] | 146 | /* delay x useconds AND preserve advance timstamp value */ |
Fabio Estevam | f231efb | 2011-10-13 05:34:59 +0000 | [diff] [blame] | 147 | void __udelay(unsigned long usec) |
Ilya Yanok | 416a41f | 2009-06-08 04:12:45 +0400 | [diff] [blame] | 148 | { |
| 149 | unsigned long long tmp; |
| 150 | ulong tmo; |
| 151 | |
| 152 | tmo = us_to_tick(usec); |
| 153 | tmp = get_ticks() + tmo; /* get current timestamp */ |
| 154 | |
| 155 | while (get_ticks() < tmp) /* loop till event */ |
| 156 | /*NOP*/; |
| 157 | } |
Stefano Babic | 51db356 | 2012-02-07 18:32:56 +0100 | [diff] [blame] | 158 | |
| 159 | ulong get_tbclk(void) |
| 160 | { |
| 161 | return CONFIG_MX27_CLK32; |
| 162 | } |