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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> |
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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 | |
141 | static struct rtc_class_ops ls1x_rtc_ops = { |
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) |
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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 | |
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175 | rtcdev = devm_rtc_device_register(&pdev->dev, "ls1x-rtc", |
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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 | |
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188 | static struct platform_driver ls1x_rtc_driver = { |
189 | .driver = { |
190 | .name = "ls1x-rtc", |
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191 | }, |
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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"); |