3 * Sascha Hauer, Pengutronix
5 * See file CREDITS for list of people who contributed to this
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
25 #include <asm/arch/imx-regs.h>
30 #define TIMER_BASE 0x53f90000 /* General purpose timer 1 */
32 /* General purpose timers registers */
33 #define GPTCR __REG(TIMER_BASE) /* Control register */
34 #define GPTPR __REG(TIMER_BASE + 0x4) /* Prescaler register */
35 #define GPTSR __REG(TIMER_BASE + 0x8) /* Status register */
36 #define GPTCNT __REG(TIMER_BASE + 0x24) /* Counter register */
38 /* General purpose timers bitfields */
39 #define GPTCR_SWR (1 << 15) /* Software reset */
40 #define GPTCR_FRR (1 << 9) /* Freerun / restart */
41 #define GPTCR_CLKSOURCE_32 (4 << 6) /* Clock source */
42 #define GPTCR_TEN 1 /* Timer enable */
44 DECLARE_GLOBAL_DATA_PTR;
46 /* "time" is measured in 1 / CONFIG_SYS_HZ seconds, "tick" is internal timer period */
47 #ifdef CONFIG_MX31_TIMER_HIGH_PRECISION
48 /* ~0.4% error - measured with stop-watch on 100s boot-delay */
49 static inline unsigned long long tick_to_time(unsigned long long tick)
51 tick *= CONFIG_SYS_HZ;
52 do_div(tick, CONFIG_MX31_CLK32);
56 static inline unsigned long long time_to_tick(unsigned long long time)
58 time *= CONFIG_MX31_CLK32;
59 do_div(time, CONFIG_SYS_HZ);
63 static inline unsigned long long us_to_tick(unsigned long long us)
65 us = us * CONFIG_MX31_CLK32 + 999999;
71 #define TICK_PER_TIME ((CONFIG_MX31_CLK32 + CONFIG_SYS_HZ / 2) / CONFIG_SYS_HZ)
72 #define US_PER_TICK (1000000 / CONFIG_MX31_CLK32)
74 static inline unsigned long long tick_to_time(unsigned long long tick)
76 do_div(tick, TICK_PER_TIME);
80 static inline unsigned long long time_to_tick(unsigned long long time)
82 return time * TICK_PER_TIME;
85 static inline unsigned long long us_to_tick(unsigned long long us)
87 us += US_PER_TICK - 1;
88 do_div(us, US_PER_TICK);
93 /* The 32768Hz 32-bit timer overruns in 131072 seconds */
98 /* setup GP Timer 1 */
100 for (i = 0; i < 100; i++)
101 GPTCR = 0; /* We have no udelay by now */
102 GPTPR = 0; /* 32Khz */
103 /* Freerun Mode, PERCLK1 input */
104 GPTCR |= GPTCR_CLKSOURCE_32 | GPTCR_TEN;
109 void reset_timer_masked (void)
112 gd->lastinc = GPTCNT; /* capture current incrementer value time */
113 gd->tbl = 0; /* start "advancing" time stamp from 0 */
116 unsigned long long get_ticks (void)
118 ulong now = GPTCNT; /* current tick value */
120 if (now >= gd->lastinc) /* normal mode (non roll) */
121 /* move stamp forward with absolut diff ticks */
122 gd->tbl += (now - gd->lastinc);
123 else /* we have rollover of incrementer */
124 gd->tbl += (0xFFFFFFFF - gd->lastinc) + now;
129 ulong get_timer_masked (void)
132 * get_ticks() returns a long long (64 bit), it wraps in
133 * 2^64 / CONFIG_MX31_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.
137 return tick_to_time(get_ticks());
140 ulong get_timer (ulong base)
142 return get_timer_masked () - base;
145 /* delay x useconds AND preserve advance timestamp value */
146 void __udelay (unsigned long usec)
148 unsigned long long tmp;
151 tmo = us_to_tick(usec);
152 tmp = get_ticks() + tmo; /* get current timestamp */
154 while (get_ticks() < tmp) /* loop till event */
158 void reset_cpu (ulong addr)
160 struct wdog_regs *wdog = (struct wdog_regs *)WDOG_BASE;
161 wdog->wcr = WDOG_ENABLE;
166 #ifdef CONFIG_HW_WATCHDOG
167 void mxc_hw_watchdog_enable(void)
169 struct wdog_regs *wdog = (struct wdog_regs *)WDOG_BASE;
173 * The timer watchdog can be set between
174 * 0.5 and 128 Seconds. If not defined
175 * in configuration file, sets 64 Seconds
177 #ifdef CONFIG_SYS_WD_TIMER_SECS
178 secs = (CONFIG_SYS_WD_TIMER_SECS << 1) & 0xFF;
183 writew(readw(&wdog->wcr) | (secs << WDOG_WT_SHIFT) | WDOG_ENABLE,
188 void mxc_hw_watchdog_reset(void)
190 struct wdog_regs *wdog = (struct wdog_regs *)WDOG_BASE;
192 writew(0x5555, &wdog->wsr);
193 writew(0xAAAA, &wdog->wsr);