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83d290c5 | 1 | // SPDX-License-Identifier: GPL-2.0+ |
aa711b11 MV |
2 | /* |
3 | * Freescale i.MX28 RTC Driver | |
4 | * | |
5 | * Copyright (C) 2011 Marek Vasut <[email protected]> | |
6 | * on behalf of DENX Software Engineering GmbH | |
aa711b11 MV |
7 | */ |
8 | ||
9 | #include <common.h> | |
10 | #include <rtc.h> | |
11 | #include <asm/io.h> | |
12 | #include <asm/arch/imx-regs.h> | |
13 | #include <asm/arch/sys_proto.h> | |
14 | ||
15 | #define MXS_RTC_MAX_TIMEOUT 1000000 | |
16 | ||
17 | /* Set time in seconds since 1970-01-01 */ | |
18 | int mxs_rtc_set_time(uint32_t secs) | |
19 | { | |
9c471142 | 20 | struct mxs_rtc_regs *rtc_regs = (struct mxs_rtc_regs *)MXS_RTC_BASE; |
aa711b11 MV |
21 | int ret; |
22 | ||
23 | writel(secs, &rtc_regs->hw_rtc_seconds); | |
24 | ||
25 | /* | |
26 | * The 0x80 here means seconds were copied to analog. This information | |
27 | * is taken from the linux kernel driver for the STMP37xx RTC since | |
28 | * documentation doesn't mention it. | |
29 | */ | |
fa7a51cb | 30 | ret = mxs_wait_mask_clr(&rtc_regs->hw_rtc_stat_reg, |
aa711b11 MV |
31 | 0x80 << RTC_STAT_STALE_REGS_OFFSET, MXS_RTC_MAX_TIMEOUT); |
32 | ||
33 | if (ret) | |
34 | printf("MXS RTC: Timeout waiting for update\n"); | |
35 | ||
36 | return ret; | |
37 | } | |
38 | ||
39 | int rtc_get(struct rtc_time *time) | |
40 | { | |
9c471142 | 41 | struct mxs_rtc_regs *rtc_regs = (struct mxs_rtc_regs *)MXS_RTC_BASE; |
aa711b11 MV |
42 | uint32_t secs; |
43 | ||
44 | secs = readl(&rtc_regs->hw_rtc_seconds); | |
9f9276c3 | 45 | rtc_to_tm(secs, time); |
aa711b11 MV |
46 | |
47 | return 0; | |
48 | } | |
49 | ||
50 | int rtc_set(struct rtc_time *time) | |
51 | { | |
52 | uint32_t secs; | |
53 | ||
71420983 | 54 | secs = rtc_mktime(time); |
aa711b11 MV |
55 | |
56 | return mxs_rtc_set_time(secs); | |
57 | } | |
58 | ||
59 | void rtc_reset(void) | |
60 | { | |
9c471142 | 61 | struct mxs_rtc_regs *rtc_regs = (struct mxs_rtc_regs *)MXS_RTC_BASE; |
aa711b11 MV |
62 | int ret; |
63 | ||
64 | /* Set time to 1970-01-01 */ | |
65 | mxs_rtc_set_time(0); | |
66 | ||
67 | /* Reset the RTC block */ | |
fa7a51cb | 68 | ret = mxs_reset_block(&rtc_regs->hw_rtc_ctrl_reg); |
aa711b11 MV |
69 | if (ret) |
70 | printf("MXS RTC: Block reset timeout\n"); | |
71 | } |