projects / people / ms / u-boot.git / blame
| Commit | Line | Data |
|---|---|---|
| aa711b11 MV |
1 | /* |
| 2 | * Freescale i.MX28 RTC Driver | |
| 3 | * | |
| 4 | * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com> | |
| 5 | * on behalf of DENX Software Engineering GmbH | |
| 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 20 | * | |
| 21 | */ | |
| 22 | ||
| 23 | #include <common.h> | |
| 24 | #include <rtc.h> | |
| 25 | #include <asm/io.h> | |
| 26 | #include <asm/arch/imx-regs.h> | |
| 27 | #include <asm/arch/sys_proto.h> | |
| 28 | ||
| 29 | #define MXS_RTC_MAX_TIMEOUT 1000000 | |
| 30 | ||
| 31 | /* Set time in seconds since 1970-01-01 */ | |
| 32 | int mxs_rtc_set_time(uint32_t secs) | |
| 33 | { | |
| 9c471142 | 34 | struct mxs_rtc_regs *rtc_regs = (struct mxs_rtc_regs *)MXS_RTC_BASE; |
| aa711b11 MV |
35 | int ret; |
| 36 | ||
| 37 | writel(secs, &rtc_regs->hw_rtc_seconds); | |
| 38 | ||
| 39 | /* | |
| 40 | * The 0x80 here means seconds were copied to analog. This information | |
| 41 | * is taken from the linux kernel driver for the STMP37xx RTC since | |
| 42 | * documentation doesn't mention it. | |
| 43 | */ | |
| 44 | ret = mx28_wait_mask_clr(&rtc_regs->hw_rtc_stat_reg, | |
| 45 | 0x80 << RTC_STAT_STALE_REGS_OFFSET, MXS_RTC_MAX_TIMEOUT); | |
| 46 | ||
| 47 | if (ret) | |
| 48 | printf("MXS RTC: Timeout waiting for update\n"); | |
| 49 | ||
| 50 | return ret; | |
| 51 | } | |
| 52 | ||
| 53 | int rtc_get(struct rtc_time *time) | |
| 54 | { | |
| 9c471142 | 55 | struct mxs_rtc_regs *rtc_regs = (struct mxs_rtc_regs *)MXS_RTC_BASE; |
| aa711b11 MV |
56 | uint32_t secs; |
| 57 | ||
| 58 | secs = readl(&rtc_regs->hw_rtc_seconds); | |
| 59 | to_tm(secs, time); | |
| 60 | ||
| 61 | return 0; | |
| 62 | } | |
| 63 | ||
| 64 | int rtc_set(struct rtc_time *time) | |
| 65 | { | |
| 66 | uint32_t secs; | |
| 67 | ||
| 68 | secs = mktime(time->tm_year, time->tm_mon, time->tm_mday, | |
| 69 | time->tm_hour, time->tm_min, time->tm_sec); | |
| 70 | ||
| 71 | return mxs_rtc_set_time(secs); | |
| 72 | } | |
| 73 | ||
| 74 | void rtc_reset(void) | |
| 75 | { | |
| 9c471142 | 76 | struct mxs_rtc_regs *rtc_regs = (struct mxs_rtc_regs *)MXS_RTC_BASE; |
| aa711b11 MV |
77 | int ret; |
| 78 | ||
| 79 | /* Set time to 1970-01-01 */ | |
| 80 | mxs_rtc_set_time(0); | |
| 81 | ||
| 82 | /* Reset the RTC block */ | |
| 83 | ret = mx28_reset_block(&rtc_regs->hw_rtc_ctrl_reg); | |
| 84 | if (ret) | |
| 85 | printf("MXS RTC: Block reset timeout\n"); | |
| 86 | } |