Geert Uytterhoeven | 4f9b9bb | 2009-03-18 23:29:27 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Oki MSM6242 RTC Driver |
| 3 | * |
| 4 | * Copyright 2009 Geert Uytterhoeven |
| 5 | * |
| 6 | * Based on the A2000 TOD code in arch/m68k/amiga/config.c |
| 7 | * Copyright (C) 1993 Hamish Macdonald |
| 8 | */ |
| 9 | |
| 10 | #include <linux/delay.h> |
| 11 | #include <linux/io.h> |
| 12 | #include <linux/kernel.h> |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/platform_device.h> |
| 15 | #include <linux/rtc.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 16 | #include <linux/slab.h> |
Geert Uytterhoeven | 4f9b9bb | 2009-03-18 23:29:27 +0100 | [diff] [blame] | 17 | |
| 18 | |
| 19 | enum { |
| 20 | MSM6242_SECOND1 = 0x0, /* 1-second digit register */ |
| 21 | MSM6242_SECOND10 = 0x1, /* 10-second digit register */ |
| 22 | MSM6242_MINUTE1 = 0x2, /* 1-minute digit register */ |
| 23 | MSM6242_MINUTE10 = 0x3, /* 10-minute digit register */ |
| 24 | MSM6242_HOUR1 = 0x4, /* 1-hour digit register */ |
| 25 | MSM6242_HOUR10 = 0x5, /* PM/AM, 10-hour digit register */ |
| 26 | MSM6242_DAY1 = 0x6, /* 1-day digit register */ |
| 27 | MSM6242_DAY10 = 0x7, /* 10-day digit register */ |
| 28 | MSM6242_MONTH1 = 0x8, /* 1-month digit register */ |
| 29 | MSM6242_MONTH10 = 0x9, /* 10-month digit register */ |
| 30 | MSM6242_YEAR1 = 0xa, /* 1-year digit register */ |
| 31 | MSM6242_YEAR10 = 0xb, /* 10-year digit register */ |
| 32 | MSM6242_WEEK = 0xc, /* Week register */ |
| 33 | MSM6242_CD = 0xd, /* Control Register D */ |
| 34 | MSM6242_CE = 0xe, /* Control Register E */ |
| 35 | MSM6242_CF = 0xf, /* Control Register F */ |
| 36 | }; |
| 37 | |
| 38 | #define MSM6242_HOUR10_AM (0 << 2) |
| 39 | #define MSM6242_HOUR10_PM (1 << 2) |
| 40 | #define MSM6242_HOUR10_HR_MASK (3 << 0) |
| 41 | |
| 42 | #define MSM6242_WEEK_SUNDAY 0 |
| 43 | #define MSM6242_WEEK_MONDAY 1 |
| 44 | #define MSM6242_WEEK_TUESDAY 2 |
| 45 | #define MSM6242_WEEK_WEDNESDAY 3 |
| 46 | #define MSM6242_WEEK_THURSDAY 4 |
| 47 | #define MSM6242_WEEK_FRIDAY 5 |
| 48 | #define MSM6242_WEEK_SATURDAY 6 |
| 49 | |
| 50 | #define MSM6242_CD_30_S_ADJ (1 << 3) /* 30-second adjustment */ |
| 51 | #define MSM6242_CD_IRQ_FLAG (1 << 2) |
| 52 | #define MSM6242_CD_BUSY (1 << 1) |
| 53 | #define MSM6242_CD_HOLD (1 << 0) |
| 54 | |
| 55 | #define MSM6242_CE_T_MASK (3 << 2) |
| 56 | #define MSM6242_CE_T_64HZ (0 << 2) /* period 1/64 second */ |
| 57 | #define MSM6242_CE_T_1HZ (1 << 2) /* period 1 second */ |
| 58 | #define MSM6242_CE_T_1MINUTE (2 << 2) /* period 1 minute */ |
| 59 | #define MSM6242_CE_T_1HOUR (3 << 2) /* period 1 hour */ |
| 60 | |
| 61 | #define MSM6242_CE_ITRPT_STND (1 << 1) |
| 62 | #define MSM6242_CE_MASK (1 << 0) /* STD.P output control */ |
| 63 | |
| 64 | #define MSM6242_CF_TEST (1 << 3) |
| 65 | #define MSM6242_CF_12H (0 << 2) |
| 66 | #define MSM6242_CF_24H (1 << 2) |
| 67 | #define MSM6242_CF_STOP (1 << 1) |
| 68 | #define MSM6242_CF_REST (1 << 0) /* reset */ |
| 69 | |
| 70 | |
| 71 | struct msm6242_priv { |
| 72 | u32 __iomem *regs; |
| 73 | struct rtc_device *rtc; |
| 74 | }; |
| 75 | |
| 76 | static inline unsigned int msm6242_read(struct msm6242_priv *priv, |
| 77 | unsigned int reg) |
| 78 | { |
| 79 | return __raw_readl(&priv->regs[reg]) & 0xf; |
| 80 | } |
| 81 | |
| 82 | static inline void msm6242_write(struct msm6242_priv *priv, unsigned int val, |
| 83 | unsigned int reg) |
| 84 | { |
John Stultz | d8ce148 | 2011-02-02 17:53:42 -0800 | [diff] [blame] | 85 | __raw_writel(val, &priv->regs[reg]); |
Geert Uytterhoeven | 4f9b9bb | 2009-03-18 23:29:27 +0100 | [diff] [blame] | 86 | } |
| 87 | |
| 88 | static inline void msm6242_set(struct msm6242_priv *priv, unsigned int val, |
| 89 | unsigned int reg) |
| 90 | { |
| 91 | msm6242_write(priv, msm6242_read(priv, reg) | val, reg); |
| 92 | } |
| 93 | |
| 94 | static inline void msm6242_clear(struct msm6242_priv *priv, unsigned int val, |
| 95 | unsigned int reg) |
| 96 | { |
| 97 | msm6242_write(priv, msm6242_read(priv, reg) & ~val, reg); |
| 98 | } |
| 99 | |
| 100 | static void msm6242_lock(struct msm6242_priv *priv) |
| 101 | { |
| 102 | int cnt = 5; |
| 103 | |
| 104 | msm6242_set(priv, MSM6242_CD_HOLD, MSM6242_CD); |
| 105 | |
| 106 | while ((msm6242_read(priv, MSM6242_CD) & MSM6242_CD_BUSY) && cnt) { |
| 107 | msm6242_clear(priv, MSM6242_CD_HOLD, MSM6242_CD); |
| 108 | udelay(70); |
| 109 | msm6242_set(priv, MSM6242_CD_HOLD, MSM6242_CD); |
| 110 | cnt--; |
| 111 | } |
| 112 | |
| 113 | if (!cnt) |
| 114 | pr_warning("msm6242: timed out waiting for RTC (0x%x)\n", |
| 115 | msm6242_read(priv, MSM6242_CD)); |
| 116 | } |
| 117 | |
| 118 | static void msm6242_unlock(struct msm6242_priv *priv) |
| 119 | { |
| 120 | msm6242_clear(priv, MSM6242_CD_HOLD, MSM6242_CD); |
| 121 | } |
| 122 | |
| 123 | static int msm6242_read_time(struct device *dev, struct rtc_time *tm) |
| 124 | { |
| 125 | struct msm6242_priv *priv = dev_get_drvdata(dev); |
| 126 | |
| 127 | msm6242_lock(priv); |
| 128 | |
| 129 | tm->tm_sec = msm6242_read(priv, MSM6242_SECOND10) * 10 + |
| 130 | msm6242_read(priv, MSM6242_SECOND1); |
| 131 | tm->tm_min = msm6242_read(priv, MSM6242_MINUTE10) * 10 + |
| 132 | msm6242_read(priv, MSM6242_MINUTE1); |
| 133 | tm->tm_hour = (msm6242_read(priv, MSM6242_HOUR10 & 3)) * 10 + |
| 134 | msm6242_read(priv, MSM6242_HOUR1); |
| 135 | tm->tm_mday = msm6242_read(priv, MSM6242_DAY10) * 10 + |
| 136 | msm6242_read(priv, MSM6242_DAY1); |
| 137 | tm->tm_wday = msm6242_read(priv, MSM6242_WEEK); |
| 138 | tm->tm_mon = msm6242_read(priv, MSM6242_MONTH10) * 10 + |
| 139 | msm6242_read(priv, MSM6242_MONTH1) - 1; |
| 140 | tm->tm_year = msm6242_read(priv, MSM6242_YEAR10) * 10 + |
| 141 | msm6242_read(priv, MSM6242_YEAR1); |
| 142 | if (tm->tm_year <= 69) |
| 143 | tm->tm_year += 100; |
| 144 | |
| 145 | if (!(msm6242_read(priv, MSM6242_CF) & MSM6242_CF_24H)) { |
| 146 | unsigned int pm = msm6242_read(priv, MSM6242_HOUR10) & |
| 147 | MSM6242_HOUR10_PM; |
| 148 | if (!pm && tm->tm_hour == 12) |
| 149 | tm->tm_hour = 0; |
| 150 | else if (pm && tm->tm_hour != 12) |
| 151 | tm->tm_hour += 12; |
| 152 | } |
| 153 | |
| 154 | msm6242_unlock(priv); |
| 155 | |
| 156 | return rtc_valid_tm(tm); |
| 157 | } |
| 158 | |
| 159 | static int msm6242_set_time(struct device *dev, struct rtc_time *tm) |
| 160 | { |
| 161 | struct msm6242_priv *priv = dev_get_drvdata(dev); |
| 162 | |
| 163 | msm6242_lock(priv); |
| 164 | |
| 165 | msm6242_write(priv, tm->tm_sec / 10, MSM6242_SECOND10); |
| 166 | msm6242_write(priv, tm->tm_sec % 10, MSM6242_SECOND1); |
| 167 | msm6242_write(priv, tm->tm_min / 10, MSM6242_MINUTE10); |
| 168 | msm6242_write(priv, tm->tm_min % 10, MSM6242_MINUTE1); |
| 169 | if (msm6242_read(priv, MSM6242_CF) & MSM6242_CF_24H) |
| 170 | msm6242_write(priv, tm->tm_hour / 10, MSM6242_HOUR10); |
| 171 | else if (tm->tm_hour >= 12) |
| 172 | msm6242_write(priv, MSM6242_HOUR10_PM + (tm->tm_hour - 12) / 10, |
| 173 | MSM6242_HOUR10); |
| 174 | else |
| 175 | msm6242_write(priv, tm->tm_hour / 10, MSM6242_HOUR10); |
| 176 | msm6242_write(priv, tm->tm_hour % 10, MSM6242_HOUR1); |
| 177 | msm6242_write(priv, tm->tm_mday / 10, MSM6242_DAY10); |
| 178 | msm6242_write(priv, tm->tm_mday % 10, MSM6242_DAY1); |
| 179 | if (tm->tm_wday != -1) |
| 180 | msm6242_write(priv, tm->tm_wday, MSM6242_WEEK); |
| 181 | msm6242_write(priv, (tm->tm_mon + 1) / 10, MSM6242_MONTH10); |
| 182 | msm6242_write(priv, (tm->tm_mon + 1) % 10, MSM6242_MONTH1); |
| 183 | if (tm->tm_year >= 100) |
| 184 | tm->tm_year -= 100; |
| 185 | msm6242_write(priv, tm->tm_year / 10, MSM6242_YEAR10); |
| 186 | msm6242_write(priv, tm->tm_year % 10, MSM6242_YEAR1); |
| 187 | |
| 188 | msm6242_unlock(priv); |
| 189 | return 0; |
| 190 | } |
| 191 | |
| 192 | static const struct rtc_class_ops msm6242_rtc_ops = { |
| 193 | .read_time = msm6242_read_time, |
| 194 | .set_time = msm6242_set_time, |
| 195 | }; |
| 196 | |
| 197 | static int __init msm6242_rtc_probe(struct platform_device *dev) |
| 198 | { |
| 199 | struct resource *res; |
| 200 | struct msm6242_priv *priv; |
| 201 | struct rtc_device *rtc; |
| 202 | int error; |
| 203 | |
| 204 | res = platform_get_resource(dev, IORESOURCE_MEM, 0); |
| 205 | if (!res) |
| 206 | return -ENODEV; |
| 207 | |
| 208 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
| 209 | if (!priv) |
| 210 | return -ENOMEM; |
| 211 | |
| 212 | priv->regs = ioremap(res->start, resource_size(res)); |
| 213 | if (!priv->regs) { |
| 214 | error = -ENOMEM; |
| 215 | goto out_free_priv; |
| 216 | } |
John Stultz | 9301523 | 2011-05-06 17:28:36 -0700 | [diff] [blame^] | 217 | platform_set_drvdata(dev, priv); |
Geert Uytterhoeven | 4f9b9bb | 2009-03-18 23:29:27 +0100 | [diff] [blame] | 218 | |
| 219 | rtc = rtc_device_register("rtc-msm6242", &dev->dev, &msm6242_rtc_ops, |
| 220 | THIS_MODULE); |
| 221 | if (IS_ERR(rtc)) { |
| 222 | error = PTR_ERR(rtc); |
| 223 | goto out_unmap; |
| 224 | } |
| 225 | |
| 226 | priv->rtc = rtc; |
Geert Uytterhoeven | 4f9b9bb | 2009-03-18 23:29:27 +0100 | [diff] [blame] | 227 | return 0; |
| 228 | |
| 229 | out_unmap: |
John Stultz | 9301523 | 2011-05-06 17:28:36 -0700 | [diff] [blame^] | 230 | platform_set_drvdata(dev, NULL); |
Geert Uytterhoeven | 4f9b9bb | 2009-03-18 23:29:27 +0100 | [diff] [blame] | 231 | iounmap(priv->regs); |
| 232 | out_free_priv: |
| 233 | kfree(priv); |
| 234 | return error; |
| 235 | } |
| 236 | |
| 237 | static int __exit msm6242_rtc_remove(struct platform_device *dev) |
| 238 | { |
| 239 | struct msm6242_priv *priv = platform_get_drvdata(dev); |
| 240 | |
| 241 | rtc_device_unregister(priv->rtc); |
| 242 | iounmap(priv->regs); |
| 243 | kfree(priv); |
| 244 | return 0; |
| 245 | } |
| 246 | |
| 247 | static struct platform_driver msm6242_rtc_driver = { |
| 248 | .driver = { |
| 249 | .name = "rtc-msm6242", |
| 250 | .owner = THIS_MODULE, |
| 251 | }, |
| 252 | .remove = __exit_p(msm6242_rtc_remove), |
| 253 | }; |
| 254 | |
| 255 | static int __init msm6242_rtc_init(void) |
| 256 | { |
| 257 | return platform_driver_probe(&msm6242_rtc_driver, msm6242_rtc_probe); |
| 258 | } |
| 259 | |
| 260 | static void __exit msm6242_rtc_fini(void) |
| 261 | { |
| 262 | platform_driver_unregister(&msm6242_rtc_driver); |
| 263 | } |
| 264 | |
| 265 | module_init(msm6242_rtc_init); |
| 266 | module_exit(msm6242_rtc_fini); |
| 267 | |
| 268 | MODULE_AUTHOR("Geert Uytterhoeven <geert@linux-m68k.org>"); |
| 269 | MODULE_LICENSE("GPL"); |
| 270 | MODULE_DESCRIPTION("Oki MSM6242 RTC driver"); |
| 271 | MODULE_ALIAS("platform:rtc-msm6242"); |