Tom Rini | 10e4779 | 2018-05-06 17:58:06 -0400 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0+ |
Ilya Yanok | 416a41f | 2009-06-08 04:12:45 +0400 | [diff] [blame] | 2 | /* |
| 3 | * (C) Copyright 2002 |
| 4 | * Sysgo Real-Time Solutions, GmbH <www.elinos.com> |
| 5 | * Marius Groeger <mgroeger@sysgo.de> |
| 6 | * |
| 7 | * (C) Copyright 2002 |
| 8 | * Sysgo Real-Time Solutions, GmbH <www.elinos.com> |
| 9 | * Alex Zuepke <azu@sysgo.de> |
| 10 | * |
| 11 | * (C) Copyright 2002 |
| 12 | * Gary Jennejohn, DENX Software Engineering, <gj@denx.de> |
| 13 | * |
| 14 | * (C) Copyright 2009 |
| 15 | * Ilya Yanok, Emcraft Systems Ltd, <yanok@emcraft.com> |
Ilya Yanok | 416a41f | 2009-06-08 04:12:45 +0400 | [diff] [blame] | 16 | */ |
| 17 | |
| 18 | #include <common.h> |
| 19 | #include <div64.h> |
| 20 | #include <asm/io.h> |
| 21 | #include <asm/arch/imx-regs.h> |
| 22 | |
| 23 | /* General purpose timers bitfields */ |
| 24 | #define GPTCR_SWR (1 << 15) /* Software reset */ |
| 25 | #define GPTCR_FRR (1 << 8) /* Freerun / restart */ |
| 26 | #define GPTCR_CLKSOURCE_32 (4 << 1) /* Clock source */ |
| 27 | #define GPTCR_TEN 1 /* Timer enable */ |
| 28 | |
Heiko Schocher | 5504dab | 2011-01-20 22:56:39 +0000 | [diff] [blame] | 29 | DECLARE_GLOBAL_DATA_PTR; |
| 30 | |
Simon Glass | 2655ee1 | 2012-12-13 20:48:34 +0000 | [diff] [blame] | 31 | #define timestamp (gd->arch.tbl) |
Simon Glass | a848da5 | 2012-12-13 20:48:35 +0000 | [diff] [blame] | 32 | #define lastinc (gd->arch.lastinc) |
Ilya Yanok | 416a41f | 2009-06-08 04:12:45 +0400 | [diff] [blame] | 33 | |
| 34 | /* |
| 35 | * "time" is measured in 1 / CONFIG_SYS_HZ seconds, |
| 36 | * "tick" is internal timer period |
| 37 | */ |
| 38 | #ifdef CONFIG_MX27_TIMER_HIGH_PRECISION |
| 39 | /* ~0.4% error - measured with stop-watch on 100s boot-delay */ |
| 40 | static inline unsigned long long tick_to_time(unsigned long long tick) |
| 41 | { |
| 42 | tick *= CONFIG_SYS_HZ; |
| 43 | do_div(tick, CONFIG_MX27_CLK32); |
| 44 | return tick; |
| 45 | } |
| 46 | |
| 47 | static inline unsigned long long time_to_tick(unsigned long long time) |
| 48 | { |
| 49 | time *= CONFIG_MX27_CLK32; |
| 50 | do_div(time, CONFIG_SYS_HZ); |
| 51 | return time; |
| 52 | } |
| 53 | |
| 54 | static inline unsigned long long us_to_tick(unsigned long long us) |
| 55 | { |
| 56 | us = us * CONFIG_MX27_CLK32 + 999999; |
| 57 | do_div(us, 1000000); |
| 58 | return us; |
| 59 | } |
| 60 | #else |
| 61 | /* ~2% error */ |
| 62 | #define TICK_PER_TIME ((CONFIG_MX27_CLK32 + CONFIG_SYS_HZ / 2) / \ |
| 63 | CONFIG_SYS_HZ) |
| 64 | #define US_PER_TICK (1000000 / CONFIG_MX27_CLK32) |
| 65 | |
| 66 | static inline unsigned long long tick_to_time(unsigned long long tick) |
| 67 | { |
| 68 | do_div(tick, TICK_PER_TIME); |
| 69 | return tick; |
| 70 | } |
| 71 | |
| 72 | static inline unsigned long long time_to_tick(unsigned long long time) |
| 73 | { |
| 74 | return time * TICK_PER_TIME; |
| 75 | } |
| 76 | |
| 77 | static inline unsigned long long us_to_tick(unsigned long long us) |
| 78 | { |
| 79 | us += US_PER_TICK - 1; |
| 80 | do_div(us, US_PER_TICK); |
| 81 | return us; |
| 82 | } |
| 83 | #endif |
| 84 | |
| 85 | /* nothing really to do with interrupts, just starts up a counter. */ |
| 86 | /* The 32768Hz 32-bit timer overruns in 131072 seconds */ |
| 87 | int timer_init(void) |
| 88 | { |
| 89 | int i; |
| 90 | struct gpt_regs *regs = (struct gpt_regs *)IMX_TIM1_BASE; |
| 91 | struct pll_regs *pll = (struct pll_regs *)IMX_PLL_BASE; |
| 92 | |
| 93 | /* setup GP Timer 1 */ |
| 94 | writel(GPTCR_SWR, ®s->gpt_tctl); |
| 95 | |
| 96 | writel(readl(&pll->pccr0) | PCCR0_GPT1_EN, &pll->pccr0); |
| 97 | writel(readl(&pll->pccr1) | PCCR1_PERCLK1_EN, &pll->pccr1); |
| 98 | |
| 99 | for (i = 0; i < 100; i++) |
| 100 | writel(0, ®s->gpt_tctl); /* We have no udelay by now */ |
| 101 | writel(0, ®s->gpt_tprer); /* 32Khz */ |
| 102 | /* Freerun Mode, PERCLK1 input */ |
| 103 | writel(readl(®s->gpt_tctl) | GPTCR_CLKSOURCE_32 | GPTCR_FRR, |
| 104 | ®s->gpt_tctl); |
| 105 | writel(readl(®s->gpt_tctl) | GPTCR_TEN, ®s->gpt_tctl); |
| 106 | |
| 107 | return 0; |
| 108 | } |
| 109 | |
Fabio Estevam | f231efb | 2011-10-13 05:34:59 +0000 | [diff] [blame] | 110 | unsigned long long get_ticks(void) |
Ilya Yanok | 416a41f | 2009-06-08 04:12:45 +0400 | [diff] [blame] | 111 | { |
| 112 | struct gpt_regs *regs = (struct gpt_regs *)IMX_TIM1_BASE; |
| 113 | ulong now = readl(®s->gpt_tcn); /* current tick value */ |
| 114 | |
| 115 | if (now >= lastinc) { |
| 116 | /* |
| 117 | * normal mode (non roll) |
| 118 | * move stamp forward with absolut diff ticks |
| 119 | */ |
| 120 | timestamp += (now - lastinc); |
| 121 | } else { |
| 122 | /* we have rollover of incrementer */ |
| 123 | timestamp += (0xFFFFFFFF - lastinc) + now; |
| 124 | } |
| 125 | lastinc = now; |
| 126 | return timestamp; |
| 127 | } |
| 128 | |
Patrick Delaunay | 9858a60 | 2018-10-05 11:33:52 +0200 | [diff] [blame] | 129 | static ulong get_timer_masked(void) |
Ilya Yanok | 416a41f | 2009-06-08 04:12:45 +0400 | [diff] [blame] | 130 | { |
| 131 | /* |
| 132 | * get_ticks() returns a long long (64 bit), it wraps in |
| 133 | * 2^64 / CONFIG_MX27_CLK32 = 2^64 / 2^15 = 2^49 ~ 5 * 10^14 (s) ~ |
| 134 | * 5 * 10^9 days... and get_ticks() * CONFIG_SYS_HZ wraps in |
| 135 | * 5 * 10^6 days - long enough. |
| 136 | */ |
| 137 | return tick_to_time(get_ticks()); |
| 138 | } |
| 139 | |
Fabio Estevam | f231efb | 2011-10-13 05:34:59 +0000 | [diff] [blame] | 140 | ulong get_timer(ulong base) |
Ilya Yanok | 416a41f | 2009-06-08 04:12:45 +0400 | [diff] [blame] | 141 | { |
Fabio Estevam | f231efb | 2011-10-13 05:34:59 +0000 | [diff] [blame] | 142 | return get_timer_masked() - base; |
Ilya Yanok | 416a41f | 2009-06-08 04:12:45 +0400 | [diff] [blame] | 143 | } |
| 144 | |
Wolfgang Denk | 1d695be | 2009-07-07 22:35:02 +0200 | [diff] [blame] | 145 | /* delay x useconds AND preserve advance timstamp value */ |
Fabio Estevam | f231efb | 2011-10-13 05:34:59 +0000 | [diff] [blame] | 146 | void __udelay(unsigned long usec) |
Ilya Yanok | 416a41f | 2009-06-08 04:12:45 +0400 | [diff] [blame] | 147 | { |
| 148 | unsigned long long tmp; |
| 149 | ulong tmo; |
| 150 | |
| 151 | tmo = us_to_tick(usec); |
| 152 | tmp = get_ticks() + tmo; /* get current timestamp */ |
| 153 | |
| 154 | while (get_ticks() < tmp) /* loop till event */ |
| 155 | /*NOP*/; |
| 156 | } |
Stefano Babic | 51db356 | 2012-02-07 18:32:56 +0100 | [diff] [blame] | 157 | |
| 158 | ulong get_tbclk(void) |
| 159 | { |
| 160 | return CONFIG_MX27_CLK32; |
| 161 | } |