Nobuhiro Iwamatsu | 4fb44e2 | 2012-06-13 16:29:47 +0900 | [diff] [blame^] | 1 | /* |
| 2 | * (C) Copyright 2012 Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com> |
| 3 | * (C) Copyright 2012 Renesas Solutions Corp. |
| 4 | * |
| 5 | * See file CREDITS for list of people who contributed to this |
| 6 | * project. |
| 7 | * |
| 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. |
| 12 | * |
| 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. |
| 17 | * |
| 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, |
| 21 | * MA 02111-1307 USA |
| 22 | */ |
| 23 | |
| 24 | #include <common.h> |
| 25 | #include <asm/io.h> |
| 26 | #include <asm/arch-armv7/globaltimer.h> |
| 27 | #include <asm/arch/rmobile.h> |
| 28 | |
| 29 | static struct globaltimer *global_timer = \ |
| 30 | (struct globaltimer *)GLOBAL_TIMER_BASE_ADDR; |
| 31 | |
| 32 | #define CLK2MHZ(clk) (clk / 1000 / 1000) |
| 33 | static u64 get_cpu_global_timer(void) |
| 34 | { |
| 35 | u32 low, high; |
| 36 | u64 timer; |
| 37 | |
| 38 | u32 old = readl(&global_timer->cnt_h); |
| 39 | while (1) { |
| 40 | low = readl(&global_timer->cnt_l); |
| 41 | high = readl(&global_timer->cnt_h); |
| 42 | if (old == high) |
| 43 | break; |
| 44 | else |
| 45 | old = high; |
| 46 | } |
| 47 | |
| 48 | timer = high; |
| 49 | return (u64)((timer << 32) | low); |
| 50 | } |
| 51 | |
| 52 | static u64 get_time_us(void) |
| 53 | { |
| 54 | u64 timer = get_cpu_global_timer(); |
| 55 | |
| 56 | timer = ((timer << 2) + (CLK2MHZ(CONFIG_SYS_CPU_CLK) >> 1)); |
| 57 | timer /= (u64)CLK2MHZ(CONFIG_SYS_CPU_CLK); |
| 58 | return timer; |
| 59 | } |
| 60 | |
| 61 | static ulong get_time_ms(void) |
| 62 | { |
| 63 | return (ulong)(get_time_us() / 1000); |
| 64 | } |
| 65 | |
| 66 | int timer_init(void) |
| 67 | { |
| 68 | writel(0x01, &global_timer->ctl); |
| 69 | return 0; |
| 70 | } |
| 71 | |
| 72 | void __udelay(unsigned long usec) |
| 73 | { |
| 74 | u64 start, current; |
| 75 | u64 wait; |
| 76 | |
| 77 | start = get_cpu_global_timer(); |
| 78 | wait = (u64)((usec * CLK2MHZ(CONFIG_SYS_CPU_CLK)) >> 2); |
| 79 | do { |
| 80 | current = get_cpu_global_timer(); |
| 81 | } while ((current - start) < wait); |
| 82 | } |
| 83 | |
| 84 | ulong get_timer(ulong base) |
| 85 | { |
| 86 | return get_time_ms() - base; |
| 87 | } |
| 88 | |
| 89 | unsigned long long get_ticks(void) |
| 90 | { |
| 91 | return get_cpu_global_timer(); |
| 92 | } |
| 93 | |
| 94 | ulong get_tbclk(void) |
| 95 | { |
| 96 | return (ulong)(CONFIG_SYS_CPU_CLK >> 2); |
| 97 | } |