1 /* 2 * SH-Mobile Timer 3 * 4 * Copyright (C) 2010 Magnus Damm 5 * Copyright (C) 2002 - 2009 Paul Mundt 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; version 2 of the License. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 19 * 20 */ 21 #include <linux/platform_device.h> 22 #include <linux/delay.h> 23 #include <asm/mach/time.h> 24 #include <asm/smp_twd.h> 25 26 void __init shmobile_setup_delay(unsigned int max_cpu_core_mhz, 27 unsigned int mult, unsigned int div) 28 { 29 /* calculate a worst-case loops-per-jiffy value 30 * based on maximum cpu core mhz setting and the 31 * __delay() implementation in arch/arm/lib/delay.S 32 * 33 * this will result in a longer delay than expected 34 * when the cpu core runs on lower frequencies. 35 */ 36 37 unsigned int value = (1000000 * mult) / (HZ * div); 38 39 if (!preset_lpj) 40 preset_lpj = max_cpu_core_mhz * value; 41 } 42 43 static void __init shmobile_late_time_init(void) 44 { 45 /* 46 * Make sure all compiled-in early timers register themselves. 47 * 48 * Run probe() for two "earlytimer" devices, these will be the 49 * clockevents and clocksource devices respectively. In the event 50 * that only a clockevents device is available, we -ENODEV on the 51 * clocksource and the jiffies clocksource is used transparently 52 * instead. No error handling is necessary here. 53 */ 54 early_platform_driver_register_all("earlytimer"); 55 early_platform_driver_probe("earlytimer", 2, 0); 56 } 57 58 void __init shmobile_earlytimer_init(void) 59 { 60 late_time_init = shmobile_late_time_init; 61 } 62 63 static void __init shmobile_timer_init(void) 64 { 65 } 66 67 struct sys_timer shmobile_timer = { 68 .init = shmobile_timer_init, 69 }; 70