1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * (C) Copyright 2003 Josef Baumgartner <josef.baumgartner (at) telex.de> 4 * 5 * (C) Copyright 2000 6 * Wolfgang Denk, DENX Software Engineering, wd (at) denx.de. 7 */ 8 9 #include <common.h> 10 11 #include <asm/timer.h> 12 #include <asm/immap.h> 13 #include <watchdog.h> 14 15 DECLARE_GLOBAL_DATA_PTR; 16 17 static volatile ulong timestamp = 0; 18 19 #ifndef CONFIG_SYS_WATCHDOG_FREQ 20 #define CONFIG_SYS_WATCHDOG_FREQ (CONFIG_SYS_HZ / 2) 21 #endif 22 23 #if defined(CONFIG_MCFTMR) 24 #ifndef CONFIG_SYS_UDELAY_BASE 25 # error "uDelay base not defined!" 26 #endif 27 28 #if !defined(CONFIG_SYS_TMR_BASE) || !defined(CONFIG_SYS_INTR_BASE) || !defined(CONFIG_SYS_TMRINTR_NO) || !defined(CONFIG_SYS_TMRINTR_MASK) 29 # error "TMR_BASE, INTR_BASE, TMRINTR_NO or TMRINTR_MASk not defined!" 30 #endif 31 extern void dtimer_intr_setup(void); 32 33 void __udelay(unsigned long usec) 34 { 35 volatile dtmr_t *timerp = (dtmr_t *) (CONFIG_SYS_UDELAY_BASE); 36 uint start, now, tmp; 37 38 while (usec > 0) { 39 if (usec > 65000) 40 tmp = 65000; 41 else 42 tmp = usec; 43 usec = usec - tmp; 44 45 /* Set up TIMER 3 as timebase clock */ 46 timerp->tmr = DTIM_DTMR_RST_RST; 47 timerp->tcn = 0; 48 /* set period to 1 us */ 49 timerp->tmr = 50 CONFIG_SYS_TIMER_PRESCALER | DTIM_DTMR_CLK_DIV1 | DTIM_DTMR_FRR | 51 DTIM_DTMR_RST_EN; 52 53 start = now = timerp->tcn; 54 while (now < start + tmp) 55 now = timerp->tcn; 56 } 57 } 58 59 void dtimer_interrupt(void *not_used) 60 { 61 volatile dtmr_t *timerp = (dtmr_t *) (CONFIG_SYS_TMR_BASE); 62 63 /* check for timer interrupt asserted */ 64 if ((CONFIG_SYS_TMRPND_REG & CONFIG_SYS_TMRINTR_MASK) == CONFIG_SYS_TMRINTR_PEND) { 65 timerp->ter = (DTIM_DTER_CAP | DTIM_DTER_REF); 66 timestamp++; 67 68 #if defined(CONFIG_WATCHDOG) || defined (CONFIG_HW_WATCHDOG) 69 if ((timestamp % (CONFIG_SYS_WATCHDOG_FREQ)) == 0) { 70 WATCHDOG_RESET (); 71 } 72 #endif /* CONFIG_WATCHDOG || CONFIG_HW_WATCHDOG */ 73 return; 74 } 75 } 76 77 int timer_init(void) 78 { 79 volatile dtmr_t *timerp = (dtmr_t *) (CONFIG_SYS_TMR_BASE); 80 81 timestamp = 0; 82 83 timerp->tcn = 0; 84 timerp->trr = 0; 85 86 /* Set up TIMER 4 as clock */ 87 timerp->tmr = DTIM_DTMR_RST_RST; 88 89 /* initialize and enable timer interrupt */ 90 irq_install_handler(CONFIG_SYS_TMRINTR_NO, dtimer_interrupt, 0); 91 92 timerp->tcn = 0; 93 timerp->trr = 1000; /* Interrupt every ms */ 94 95 dtimer_intr_setup(); 96 97 /* set a period of 1us, set timer mode to restart and enable timer and interrupt */ 98 timerp->tmr = CONFIG_SYS_TIMER_PRESCALER | DTIM_DTMR_CLK_DIV1 | 99 DTIM_DTMR_FRR | DTIM_DTMR_ORRI | DTIM_DTMR_RST_EN; 100 101 return 0; 102 } 103 104 ulong get_timer(ulong base) 105 { 106 return (timestamp - base); 107 } 108 109 #endif /* CONFIG_MCFTMR */ 110 111 #if defined(CONFIG_MCFPIT) 112 #if !defined(CONFIG_SYS_PIT_BASE) 113 # error "CONFIG_SYS_PIT_BASE not defined!" 114 #endif 115 116 static unsigned short lastinc; 117 118 void __udelay(unsigned long usec) 119 { 120 volatile pit_t *timerp = (pit_t *) (CONFIG_SYS_UDELAY_BASE); 121 uint tmp; 122 123 while (usec > 0) { 124 if (usec > 65000) 125 tmp = 65000; 126 else 127 tmp = usec; 128 usec = usec - tmp; 129 130 /* Set up TIMER 3 as timebase clock */ 131 timerp->pcsr = PIT_PCSR_OVW; 132 timerp->pmr = 0; 133 /* set period to 1 us */ 134 timerp->pcsr |= PIT_PCSR_PRE(CONFIG_SYS_PIT_PRESCALE) | PIT_PCSR_EN; 135 136 timerp->pmr = tmp; 137 while (timerp->pcntr > 0) ; 138 } 139 } 140 141 void timer_init(void) 142 { 143 volatile pit_t *timerp = (pit_t *) (CONFIG_SYS_PIT_BASE); 144 timestamp = 0; 145 146 /* Set up TIMER 4 as poll clock */ 147 timerp->pcsr = PIT_PCSR_OVW; 148 timerp->pmr = lastinc = 0; 149 timerp->pcsr |= PIT_PCSR_PRE(CONFIG_SYS_PIT_PRESCALE) | PIT_PCSR_EN; 150 151 return 0; 152 } 153 154 ulong get_timer(ulong base) 155 { 156 unsigned short now, diff; 157 volatile pit_t *timerp = (pit_t *) (CONFIG_SYS_PIT_BASE); 158 159 now = timerp->pcntr; 160 diff = -(now - lastinc); 161 162 timestamp += diff; 163 lastinc = now; 164 return timestamp - base; 165 } 166 167 void wait_ticks(unsigned long ticks) 168 { 169 u32 start = get_timer(0); 170 while (get_timer(start) < ticks) ; 171 } 172 #endif /* CONFIG_MCFPIT */ 173 174 /* 175 * This function is derived from PowerPC code (read timebase as long long). 176 * On M68K it just returns the timer value. 177 */ 178 unsigned long long get_ticks(void) 179 { 180 return get_timer(0); 181 } 182 183 unsigned long usec2ticks(unsigned long usec) 184 { 185 return get_timer(usec); 186 } 187 188 /* 189 * This function is derived from PowerPC code (timebase clock frequency). 190 * On M68K it returns the number of timer ticks per second. 191 */ 192 ulong get_tbclk(void) 193 { 194 return CONFIG_SYS_HZ; 195 } 196
