1 /* 2 * Marvell PXA2xx/3xx timer driver 3 * 4 * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com> 5 * 6 * SPDX-License-Identifier: GPL-2.0+ 7 */ 8 9 #include <asm/arch/pxa-regs.h> 10 #include <asm/io.h> 11 #include <common.h> 12 #include <div64.h> 13 14 DECLARE_GLOBAL_DATA_PTR; 15 16 #define TIMER_LOAD_VAL 0xffffffff 17 18 #define timestamp (gd->arch.tbl) 19 #define lastinc (gd->arch.lastinc) 20 21 #if defined(CONFIG_CPU_PXA27X) || defined(CONFIG_CPU_MONAHANS) 22 #define TIMER_FREQ_HZ 3250000 23 #elif defined(CONFIG_CPU_PXA25X) 24 #define TIMER_FREQ_HZ 3686400 25 #else 26 #error "Timer frequency unknown - please config PXA CPU type" 27 #endif 28 29 static unsigned long long tick_to_time(unsigned long long tick) 30 { 31 return lldiv(tick * CONFIG_SYS_HZ, TIMER_FREQ_HZ); 32 } 33 34 static unsigned long long us_to_tick(unsigned long long us) 35 { 36 return lldiv(us * TIMER_FREQ_HZ, 1000000); 37 } 38 39 int timer_init(void) 40 { 41 writel(0, OSCR); 42 return 0; 43 } 44 45 unsigned long long get_ticks(void) 46 { 47 /* Current tick value */ 48 uint32_t now = readl(OSCR); 49 50 if (now >= lastinc) { 51 /* 52 * Normal mode (non roll) 53 * Move stamp forward with absolute diff ticks 54 */ 55 timestamp += (now - lastinc); 56 } else { 57 /* We have rollover of incrementer */ 58 timestamp += (TIMER_LOAD_VAL - lastinc) + now; 59 } 60 61 lastinc = now; 62 return timestamp; 63 } 64 65 ulong get_timer(ulong base) 66 { 67 return tick_to_time(get_ticks()) - base; 68 } 69 70 void __udelay(unsigned long usec) 71 { 72 unsigned long long tmp; 73 ulong tmo; 74 75 tmo = us_to_tick(usec); 76 tmp = get_ticks() + tmo; /* get current timestamp */ 77 78 while (get_ticks() < tmp) /* loop till event */ 79 /*NOP*/; 80 } 81 82 ulong get_tbclk(void) 83 { 84 return TIMER_FREQ_HZ; 85 } 86