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b4f0b880 | 1 | /* |
2 | * Copyright (c) 2011 Zhao Zhang <zhzhl555@gmail.com> | |
3 | * | |
4 | * Derived from driver/rtc/rtc-au1xxx.c | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the | |
8 | * Free Software Foundation; either version 2 of the License, or (at your | |
9 | * option) any later version. | |
10 | */ | |
11 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/rtc.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/platform_device.h> | |
17 | #include <linux/delay.h> | |
18 | #include <linux/types.h> | |
19 | #include <linux/io.h> | |
30ad29bb | 20 | #include <loongson1.h> |
b4f0b880 | 21 | |
22 | #define LS1X_RTC_REG_OFFSET (LS1X_RTC_BASE + 0x20) | |
23 | #define LS1X_RTC_REGS(x) \ | |
24 | ((void __iomem *)KSEG1ADDR(LS1X_RTC_REG_OFFSET + (x))) | |
25 | ||
26 | /*RTC programmable counters 0 and 1*/ | |
27 | #define SYS_COUNTER_CNTRL (LS1X_RTC_REGS(0x20)) | |
28 | #define SYS_CNTRL_ERS (1 << 23) | |
29 | #define SYS_CNTRL_RTS (1 << 20) | |
30 | #define SYS_CNTRL_RM2 (1 << 19) | |
31 | #define SYS_CNTRL_RM1 (1 << 18) | |
32 | #define SYS_CNTRL_RM0 (1 << 17) | |
33 | #define SYS_CNTRL_RS (1 << 16) | |
34 | #define SYS_CNTRL_BP (1 << 14) | |
35 | #define SYS_CNTRL_REN (1 << 13) | |
36 | #define SYS_CNTRL_BRT (1 << 12) | |
37 | #define SYS_CNTRL_TEN (1 << 11) | |
38 | #define SYS_CNTRL_BTT (1 << 10) | |
39 | #define SYS_CNTRL_E0 (1 << 8) | |
40 | #define SYS_CNTRL_ETS (1 << 7) | |
41 | #define SYS_CNTRL_32S (1 << 5) | |
42 | #define SYS_CNTRL_TTS (1 << 4) | |
43 | #define SYS_CNTRL_TM2 (1 << 3) | |
44 | #define SYS_CNTRL_TM1 (1 << 2) | |
45 | #define SYS_CNTRL_TM0 (1 << 1) | |
46 | #define SYS_CNTRL_TS (1 << 0) | |
47 | ||
48 | /* Programmable Counter 0 Registers */ | |
49 | #define SYS_TOYTRIM (LS1X_RTC_REGS(0)) | |
50 | #define SYS_TOYWRITE0 (LS1X_RTC_REGS(4)) | |
51 | #define SYS_TOYWRITE1 (LS1X_RTC_REGS(8)) | |
52 | #define SYS_TOYREAD0 (LS1X_RTC_REGS(0xC)) | |
53 | #define SYS_TOYREAD1 (LS1X_RTC_REGS(0x10)) | |
54 | #define SYS_TOYMATCH0 (LS1X_RTC_REGS(0x14)) | |
55 | #define SYS_TOYMATCH1 (LS1X_RTC_REGS(0x18)) | |
56 | #define SYS_TOYMATCH2 (LS1X_RTC_REGS(0x1C)) | |
57 | ||
58 | /* Programmable Counter 1 Registers */ | |
59 | #define SYS_RTCTRIM (LS1X_RTC_REGS(0x40)) | |
60 | #define SYS_RTCWRITE0 (LS1X_RTC_REGS(0x44)) | |
61 | #define SYS_RTCREAD0 (LS1X_RTC_REGS(0x48)) | |
62 | #define SYS_RTCMATCH0 (LS1X_RTC_REGS(0x4C)) | |
63 | #define SYS_RTCMATCH1 (LS1X_RTC_REGS(0x50)) | |
64 | #define SYS_RTCMATCH2 (LS1X_RTC_REGS(0x54)) | |
65 | ||
66 | #define LS1X_SEC_OFFSET (4) | |
67 | #define LS1X_MIN_OFFSET (10) | |
68 | #define LS1X_HOUR_OFFSET (16) | |
69 | #define LS1X_DAY_OFFSET (21) | |
70 | #define LS1X_MONTH_OFFSET (26) | |
71 | ||
72 | ||
73 | #define LS1X_SEC_MASK (0x3f) | |
74 | #define LS1X_MIN_MASK (0x3f) | |
75 | #define LS1X_HOUR_MASK (0x1f) | |
76 | #define LS1X_DAY_MASK (0x1f) | |
77 | #define LS1X_MONTH_MASK (0x3f) | |
78 | #define LS1X_YEAR_MASK (0xffffffff) | |
79 | ||
80 | #define ls1x_get_sec(t) (((t) >> LS1X_SEC_OFFSET) & LS1X_SEC_MASK) | |
81 | #define ls1x_get_min(t) (((t) >> LS1X_MIN_OFFSET) & LS1X_MIN_MASK) | |
82 | #define ls1x_get_hour(t) (((t) >> LS1X_HOUR_OFFSET) & LS1X_HOUR_MASK) | |
83 | #define ls1x_get_day(t) (((t) >> LS1X_DAY_OFFSET) & LS1X_DAY_MASK) | |
84 | #define ls1x_get_month(t) (((t) >> LS1X_MONTH_OFFSET) & LS1X_MONTH_MASK) | |
85 | ||
86 | #define RTC_CNTR_OK (SYS_CNTRL_E0 | SYS_CNTRL_32S) | |
87 | ||
88 | static int ls1x_rtc_read_time(struct device *dev, struct rtc_time *rtm) | |
89 | { | |
90 | unsigned long v, t; | |
91 | ||
92 | v = readl(SYS_TOYREAD0); | |
93 | t = readl(SYS_TOYREAD1); | |
94 | ||
95 | memset(rtm, 0, sizeof(struct rtc_time)); | |
96 | t = mktime((t & LS1X_YEAR_MASK), ls1x_get_month(v), | |
97 | ls1x_get_day(v), ls1x_get_hour(v), | |
98 | ls1x_get_min(v), ls1x_get_sec(v)); | |
99 | rtc_time_to_tm(t, rtm); | |
100 | ||
101 | return rtc_valid_tm(rtm); | |
102 | } | |
103 | ||
104 | static int ls1x_rtc_set_time(struct device *dev, struct rtc_time *rtm) | |
105 | { | |
106 | unsigned long v, t, c; | |
107 | int ret = -ETIMEDOUT; | |
108 | ||
109 | v = ((rtm->tm_mon + 1) << LS1X_MONTH_OFFSET) | |
110 | | (rtm->tm_mday << LS1X_DAY_OFFSET) | |
111 | | (rtm->tm_hour << LS1X_HOUR_OFFSET) | |
112 | | (rtm->tm_min << LS1X_MIN_OFFSET) | |
113 | | (rtm->tm_sec << LS1X_SEC_OFFSET); | |
114 | ||
115 | writel(v, SYS_TOYWRITE0); | |
116 | c = 0x10000; | |
117 | /* add timeout check counter, for more safe */ | |
118 | while ((readl(SYS_COUNTER_CNTRL) & SYS_CNTRL_TS) && --c) | |
119 | usleep_range(1000, 3000); | |
120 | ||
121 | if (!c) { | |
122 | dev_err(dev, "set time timeout!\n"); | |
123 | goto err; | |
124 | } | |
125 | ||
126 | t = rtm->tm_year + 1900; | |
127 | writel(t, SYS_TOYWRITE1); | |
128 | c = 0x10000; | |
129 | while ((readl(SYS_COUNTER_CNTRL) & SYS_CNTRL_TS) && --c) | |
130 | usleep_range(1000, 3000); | |
131 | ||
132 | if (!c) { | |
133 | dev_err(dev, "set time timeout!\n"); | |
134 | goto err; | |
135 | } | |
136 | return 0; | |
137 | err: | |
138 | return ret; | |
139 | } | |
140 | ||
8bc57e7f | 141 | static const struct rtc_class_ops ls1x_rtc_ops = { |
b4f0b880 | 142 | .read_time = ls1x_rtc_read_time, |
143 | .set_time = ls1x_rtc_set_time, | |
144 | }; | |
145 | ||
5a167f45 | 146 | static int ls1x_rtc_probe(struct platform_device *pdev) |
b4f0b880 | 147 | { |
148 | struct rtc_device *rtcdev; | |
149 | unsigned long v; | |
150 | int ret; | |
151 | ||
152 | v = readl(SYS_COUNTER_CNTRL); | |
153 | if (!(v & RTC_CNTR_OK)) { | |
154 | dev_err(&pdev->dev, "rtc counters not working\n"); | |
155 | ret = -ENODEV; | |
156 | goto err; | |
157 | } | |
158 | ret = -ETIMEDOUT; | |
159 | /* set to 1 HZ if needed */ | |
160 | if (readl(SYS_TOYTRIM) != 32767) { | |
161 | v = 0x100000; | |
162 | while ((readl(SYS_COUNTER_CNTRL) & SYS_CNTRL_TTS) && --v) | |
163 | usleep_range(1000, 3000); | |
164 | ||
165 | if (!v) { | |
166 | dev_err(&pdev->dev, "time out\n"); | |
167 | goto err; | |
168 | } | |
169 | writel(32767, SYS_TOYTRIM); | |
170 | } | |
171 | /* this loop coundn't be endless */ | |
172 | while (readl(SYS_COUNTER_CNTRL) & SYS_CNTRL_TTS) | |
173 | usleep_range(1000, 3000); | |
174 | ||
418ca60c | 175 | rtcdev = devm_rtc_device_register(&pdev->dev, "ls1x-rtc", |
b4f0b880 | 176 | &ls1x_rtc_ops , THIS_MODULE); |
177 | if (IS_ERR(rtcdev)) { | |
178 | ret = PTR_ERR(rtcdev); | |
179 | goto err; | |
180 | } | |
181 | ||
182 | platform_set_drvdata(pdev, rtcdev); | |
183 | return 0; | |
184 | err: | |
185 | return ret; | |
186 | } | |
187 | ||
b4f0b880 | 188 | static struct platform_driver ls1x_rtc_driver = { |
189 | .driver = { | |
190 | .name = "ls1x-rtc", | |
b4f0b880 | 191 | }, |
b4f0b880 | 192 | .probe = ls1x_rtc_probe, |
193 | }; | |
194 | ||
195 | module_platform_driver(ls1x_rtc_driver); | |
196 | ||
197 | MODULE_AUTHOR("zhao zhang <zhzhl555@gmail.com>"); | |
198 | MODULE_LICENSE("GPL"); |