| Po-Yu Chuang | 39ba774 | 2009-11-11 17:26:00 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Faraday FTRTC010 Real Time Clock |
| 3 | * |
| 4 | * (C) Copyright 2009 Faraday Technology |
| 5 | * Po-Yu Chuang <ratbert@faraday-tech.com> |
| 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; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, write to the Free Software |
| 19 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 20 | */ |
| 21 | |
| 22 | #include <config.h> |
| 23 | #include <common.h> |
| 24 | #include <rtc.h> |
| 25 | #include <asm/io.h> |
| 26 | |
| 27 | struct ftrtc010 { |
| 28 | unsigned int sec; /* 0x00 */ |
| 29 | unsigned int min; /* 0x04 */ |
| 30 | unsigned int hour; /* 0x08 */ |
| 31 | unsigned int day; /* 0x0c */ |
| 32 | unsigned int alarm_sec; /* 0x10 */ |
| 33 | unsigned int alarm_min; /* 0x14 */ |
| 34 | unsigned int alarm_hour; /* 0x18 */ |
| 35 | unsigned int record; /* 0x1c */ |
| 36 | unsigned int cr; /* 0x20 */ |
| 37 | }; |
| 38 | |
| 39 | /* |
| 40 | * RTC Control Register |
| 41 | */ |
| 42 | #define FTRTC010_CR_ENABLE (1 << 0) |
| 43 | #define FTRTC010_CR_INTERRUPT_SEC (1 << 1) /* per second irq */ |
| 44 | #define FTRTC010_CR_INTERRUPT_MIN (1 << 2) /* per minute irq */ |
| 45 | #define FTRTC010_CR_INTERRUPT_HR (1 << 3) /* per hour irq */ |
| 46 | #define FTRTC010_CR_INTERRUPT_DAY (1 << 4) /* per day irq */ |
| 47 | |
| 48 | static struct ftrtc010 *rtc = (struct ftrtc010 *)CONFIG_FTRTC010_BASE; |
| 49 | |
| 50 | static void ftrtc010_enable(void) |
| 51 | { |
| 52 | writel(FTRTC010_CR_ENABLE, &rtc->cr); |
| 53 | } |
| 54 | |
| 55 | /* |
| 56 | * return current time in seconds |
| 57 | */ |
| 58 | static unsigned long ftrtc010_time(void) |
| 59 | { |
| 60 | unsigned long day; |
| 61 | unsigned long hour; |
| 62 | unsigned long minute; |
| 63 | unsigned long second; |
| 64 | unsigned long second2; |
| 65 | |
| 66 | do { |
| 67 | second = readl(&rtc->sec); |
| 68 | day = readl(&rtc->day); |
| 69 | hour = readl(&rtc->hour); |
| 70 | minute = readl(&rtc->min); |
| 71 | second2 = readl(&rtc->sec); |
| 72 | } while (second != second2); |
| 73 | |
| 74 | return day * 24 * 60 * 60 + hour * 60 * 60 + minute * 60 + second; |
| 75 | } |
| 76 | |
| 77 | /* |
| 78 | * Get the current time from the RTC |
| 79 | */ |
| 80 | |
| 81 | int rtc_get(struct rtc_time *tmp) |
| 82 | { |
| 83 | unsigned long now; |
| 84 | |
| 85 | debug("%s(): record register: %x\n", |
| 86 | __func__, readl(&rtc->record)); |
| 87 | |
| 88 | now = ftrtc010_time() + readl(&rtc->record); |
| 89 | |
| 90 | to_tm(now, tmp); |
| 91 | |
| 92 | return 0; |
| 93 | } |
| 94 | |
| 95 | /* |
| 96 | * Set the RTC |
| 97 | */ |
| 98 | int rtc_set(struct rtc_time *tmp) |
| 99 | { |
| 100 | unsigned long new; |
| 101 | unsigned long now; |
| 102 | |
| 103 | debug("%s(): DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", |
| 104 | __func__, |
| 105 | tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, |
| 106 | tmp->tm_hour, tmp->tm_min, tmp->tm_sec); |
| 107 | |
| 108 | new = mktime(tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_hour, |
| 109 | tmp->tm_min, tmp->tm_sec); |
| 110 | |
| 111 | now = ftrtc010_time(); |
| 112 | |
| 113 | debug("%s(): write %lx to record register\n", __func__, new - now); |
| 114 | |
| 115 | writel(new - now, &rtc->record); |
| 116 | |
| 117 | return 0; |
| 118 | } |
| 119 | |
| 120 | void rtc_reset(void) |
| 121 | { |
| 122 | debug("%s()\n", __func__); |
| 123 | ftrtc010_enable(); |
| 124 | } |