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 * See file CREDITS for list of people who contributed to this 11 * project. 12 * 13 * This program is free software; you can redistribute it and/or 14 * modify it under the terms of the GNU General Public License as 15 * published by the Free Software Foundation; either version 2 of 16 * the License, or (at your option) any later version. 17 * 18 * This program is distributed in the hope that it will be useful, 19 * but WITHOUT ANY WARRANTY; without even the implied warranty of 20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 21 * GNU General Public License for more details. 22 * 23 * You should have received a copy of the GNU General Public License 24 * along with this program; if not, write to the Free Software 25 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 26 * MA 02111-1307 USA 27 */ 28 29 #include <common.h> 30 #include <asm/arch/pxa-regs.h> 31 #include <div64.h> 32 33 #ifdef CONFIG_USE_IRQ 34 #error: interrupts not implemented yet 35 #endif 36 37 #if defined(CONFIG_PXA27X) || defined(CONFIG_CPU_MONAHANS) 38 #define TIMER_FREQ_HZ 3250000 39 #elif defined(CONFIG_PXA250) 40 #define TIMER_FREQ_HZ 3686400 41 #else 42 #error "Timer frequency unknown - please config PXA CPU type" 43 #endif 44 45 static inline unsigned long long tick_to_time(unsigned long long tick) 46 { 47 tick *= CONFIG_SYS_HZ; 48 do_div(tick, TIMER_FREQ_HZ); 49 return tick; 50 } 51 52 static inline unsigned long long us_to_tick(unsigned long long us) 53 { 54 us = us * TIMER_FREQ_HZ + 999999; 55 do_div(us, 1000000); 56 return us; 57 } 58 59 int timer_init (void) 60 { 61 reset_timer(); 62 63 return 0; 64 } 65 66 void reset_timer (void) 67 { 68 reset_timer_masked (); 69 } 70 71 ulong get_timer (ulong base) 72 { 73 return get_timer_masked () - base; 74 } 75 76 void set_timer (ulong t) 77 { 78 /* nop */ 79 } 80 81 void __udelay (unsigned long usec) 82 { 83 udelay_masked (usec); 84 } 85 86 87 void reset_timer_masked (void) 88 { 89 OSCR = 0; 90 } 91 92 ulong get_timer_masked (void) 93 { 94 return tick_to_time(get_ticks()); 95 } 96 97 void udelay_masked (unsigned long usec) 98 { 99 unsigned long long tmp; 100 ulong tmo; 101 102 tmo = us_to_tick(usec); 103 tmp = get_ticks() + tmo; /* get current timestamp */ 104 105 while (get_ticks() < tmp) /* loop till event */ 106 /*NOP*/; 107 108 } 109 110 /* 111 * This function is derived from PowerPC code (read timebase as long long). 112 * On ARM it just returns the timer value. 113 */ 114 unsigned long long get_ticks(void) 115 { 116 return OSCR; 117 } 118 119 /* 120 * This function is derived from PowerPC code (timebase clock frequency). 121 * On ARM it returns the number of timer ticks per second. 122 */ 123 ulong get_tbclk (void) 124 { 125 ulong tbclk; 126 tbclk = TIMER_FREQ_HZ; 127 return tbclk; 128 } 129