| Marek Vasut | 8648726 | 2011-11-08 23:18:17 +0000 | [diff] [blame] | 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 | { |
| 34 | struct mx28_rtc_regs *rtc_regs = (struct mx28_rtc_regs *)MXS_RTC_BASE; |
| 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 | { |
| 55 | struct mx28_rtc_regs *rtc_regs = (struct mx28_rtc_regs *)MXS_RTC_BASE; |
| 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 | { |
| 76 | struct mx28_rtc_regs *rtc_regs = (struct mx28_rtc_regs *)MXS_RTC_BASE; |
| 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 | } |