1 /* 2 * Ricoh RP5C01 RTC Driver 3 * 4 * Copyright 2009 Geert Uytterhoeven 5 * 6 * Based on the A3000 TOD code in arch/m68k/amiga/config.c 7 * Copyright (C) 1993 Hamish Macdonald 8 */ 9 10 #include <linux/io.h> 11 #include <linux/kernel.h> 12 #include <linux/module.h> 13 #include <linux/platform_device.h> 14 #include <linux/rtc.h> 15 16 17 enum { 18 RP5C01_1_SECOND = 0x0, /* MODE 00 */ 19 RP5C01_10_SECOND = 0x1, /* MODE 00 */ 20 RP5C01_1_MINUTE = 0x2, /* MODE 00 and MODE 01 */ 21 RP5C01_10_MINUTE = 0x3, /* MODE 00 and MODE 01 */ 22 RP5C01_1_HOUR = 0x4, /* MODE 00 and MODE 01 */ 23 RP5C01_10_HOUR = 0x5, /* MODE 00 and MODE 01 */ 24 RP5C01_DAY_OF_WEEK = 0x6, /* MODE 00 and MODE 01 */ 25 RP5C01_1_DAY = 0x7, /* MODE 00 and MODE 01 */ 26 RP5C01_10_DAY = 0x8, /* MODE 00 and MODE 01 */ 27 RP5C01_1_MONTH = 0x9, /* MODE 00 */ 28 RP5C01_10_MONTH = 0xa, /* MODE 00 */ 29 RP5C01_1_YEAR = 0xb, /* MODE 00 */ 30 RP5C01_10_YEAR = 0xc, /* MODE 00 */ 31 32 RP5C01_12_24_SELECT = 0xa, /* MODE 01 */ 33 RP5C01_LEAP_YEAR = 0xb, /* MODE 01 */ 34 35 RP5C01_MODE = 0xd, /* all modes */ 36 RP5C01_TEST = 0xe, /* all modes */ 37 RP5C01_RESET = 0xf, /* all modes */ 38 }; 39 40 #define RP5C01_12_24_SELECT_12 (0 << 0) 41 #define RP5C01_12_24_SELECT_24 (1 << 0) 42 43 #define RP5C01_10_HOUR_AM (0 << 1) 44 #define RP5C01_10_HOUR_PM (1 << 1) 45 46 #define RP5C01_MODE_TIMER_EN (1 << 3) /* timer enable */ 47 #define RP5C01_MODE_ALARM_EN (1 << 2) /* alarm enable */ 48 49 #define RP5C01_MODE_MODE_MASK (3 << 0) 50 #define RP5C01_MODE_MODE00 (0 << 0) /* time */ 51 #define RP5C01_MODE_MODE01 (1 << 0) /* alarm, 12h/24h, leap year */ 52 #define RP5C01_MODE_RAM_BLOCK10 (2 << 0) /* RAM 4 bits x 13 */ 53 #define RP5C01_MODE_RAM_BLOCK11 (3 << 0) /* RAM 4 bits x 13 */ 54 55 #define RP5C01_RESET_1HZ_PULSE (1 << 3) 56 #define RP5C01_RESET_16HZ_PULSE (1 << 2) 57 #define RP5C01_RESET_SECOND (1 << 1) /* reset divider stages for */ 58 /* seconds or smaller units */ 59 #define RP5C01_RESET_ALARM (1 << 0) /* reset all alarm registers */ 60 61 62 struct rp5c01_priv { 63 u32 __iomem *regs; 64 struct rtc_device *rtc; 65 }; 66 67 static inline unsigned int rp5c01_read(struct rp5c01_priv *priv, 68 unsigned int reg) 69 { 70 return __raw_readl(&priv->regs[reg]) & 0xf; 71 } 72 73 static inline void rp5c01_write(struct rp5c01_priv *priv, unsigned int val, 74 unsigned int reg) 75 { 76 return __raw_writel(val, &priv->regs[reg]); 77 } 78 79 static void rp5c01_lock(struct rp5c01_priv *priv) 80 { 81 rp5c01_write(priv, RP5C01_MODE_MODE00, RP5C01_MODE); 82 } 83 84 static void rp5c01_unlock(struct rp5c01_priv *priv) 85 { 86 rp5c01_write(priv, RP5C01_MODE_TIMER_EN | RP5C01_MODE_MODE01, 87 RP5C01_MODE); 88 } 89 90 static int rp5c01_read_time(struct device *dev, struct rtc_time *tm) 91 { 92 struct rp5c01_priv *priv = dev_get_drvdata(dev); 93 94 rp5c01_lock(priv); 95 96 tm->tm_sec = rp5c01_read(priv, RP5C01_10_SECOND) * 10 + 97 rp5c01_read(priv, RP5C01_1_SECOND); 98 tm->tm_min = rp5c01_read(priv, RP5C01_10_MINUTE) * 10 + 99 rp5c01_read(priv, RP5C01_1_MINUTE); 100 tm->tm_hour = rp5c01_read(priv, RP5C01_10_HOUR) * 10 + 101 rp5c01_read(priv, RP5C01_1_HOUR); 102 tm->tm_mday = rp5c01_read(priv, RP5C01_10_DAY) * 10 + 103 rp5c01_read(priv, RP5C01_1_DAY); 104 tm->tm_wday = rp5c01_read(priv, RP5C01_DAY_OF_WEEK); 105 tm->tm_mon = rp5c01_read(priv, RP5C01_10_MONTH) * 10 + 106 rp5c01_read(priv, RP5C01_1_MONTH) - 1; 107 tm->tm_year = rp5c01_read(priv, RP5C01_10_YEAR) * 10 + 108 rp5c01_read(priv, RP5C01_1_YEAR); 109 if (tm->tm_year <= 69) 110 tm->tm_year += 100; 111 112 rp5c01_unlock(priv); 113 114 return rtc_valid_tm(tm); 115 } 116 117 static int rp5c01_set_time(struct device *dev, struct rtc_time *tm) 118 { 119 struct rp5c01_priv *priv = dev_get_drvdata(dev); 120 121 rp5c01_lock(priv); 122 123 rp5c01_write(priv, tm->tm_sec / 10, RP5C01_10_SECOND); 124 rp5c01_write(priv, tm->tm_sec % 10, RP5C01_1_SECOND); 125 rp5c01_write(priv, tm->tm_min / 10, RP5C01_10_MINUTE); 126 rp5c01_write(priv, tm->tm_min % 10, RP5C01_1_MINUTE); 127 rp5c01_write(priv, tm->tm_hour / 10, RP5C01_10_HOUR); 128 rp5c01_write(priv, tm->tm_hour % 10, RP5C01_1_HOUR); 129 rp5c01_write(priv, tm->tm_mday / 10, RP5C01_10_DAY); 130 rp5c01_write(priv, tm->tm_mday % 10, RP5C01_1_DAY); 131 if (tm->tm_wday != -1) 132 rp5c01_write(priv, tm->tm_wday, RP5C01_DAY_OF_WEEK); 133 rp5c01_write(priv, (tm->tm_mon + 1) / 10, RP5C01_10_MONTH); 134 rp5c01_write(priv, (tm->tm_mon + 1) % 10, RP5C01_1_MONTH); 135 if (tm->tm_year >= 100) 136 tm->tm_year -= 100; 137 rp5c01_write(priv, tm->tm_year / 10, RP5C01_10_YEAR); 138 rp5c01_write(priv, tm->tm_year % 10, RP5C01_1_YEAR); 139 140 rp5c01_unlock(priv); 141 return 0; 142 } 143 144 static const struct rtc_class_ops rp5c01_rtc_ops = { 145 .read_time = rp5c01_read_time, 146 .set_time = rp5c01_set_time, 147 }; 148 149 static int __init rp5c01_rtc_probe(struct platform_device *dev) 150 { 151 struct resource *res; 152 struct rp5c01_priv *priv; 153 struct rtc_device *rtc; 154 int error; 155 156 res = platform_get_resource(dev, IORESOURCE_MEM, 0); 157 if (!res) 158 return -ENODEV; 159 160 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 161 if (!priv) 162 return -ENOMEM; 163 164 priv->regs = ioremap(res->start, resource_size(res)); 165 if (!priv->regs) { 166 error = -ENOMEM; 167 goto out_free_priv; 168 } 169 170 rtc = rtc_device_register("rtc-rp5c01", &dev->dev, &rp5c01_rtc_ops, 171 THIS_MODULE); 172 if (IS_ERR(rtc)) { 173 error = PTR_ERR(rtc); 174 goto out_unmap; 175 } 176 177 priv->rtc = rtc; 178 platform_set_drvdata(dev, priv); 179 return 0; 180 181 out_unmap: 182 iounmap(priv->regs); 183 out_free_priv: 184 kfree(priv); 185 return error; 186 } 187 188 static int __exit rp5c01_rtc_remove(struct platform_device *dev) 189 { 190 struct rp5c01_priv *priv = platform_get_drvdata(dev); 191 192 rtc_device_unregister(priv->rtc); 193 iounmap(priv->regs); 194 kfree(priv); 195 return 0; 196 } 197 198 static struct platform_driver rp5c01_rtc_driver = { 199 .driver = { 200 .name = "rtc-rp5c01", 201 .owner = THIS_MODULE, 202 }, 203 .remove = __exit_p(rp5c01_rtc_remove), 204 }; 205 206 static int __init rp5c01_rtc_init(void) 207 { 208 return platform_driver_probe(&rp5c01_rtc_driver, rp5c01_rtc_probe); 209 } 210 211 static void __exit rp5c01_rtc_fini(void) 212 { 213 platform_driver_unregister(&rp5c01_rtc_driver); 214 } 215 216 module_init(rp5c01_rtc_init); 217 module_exit(rp5c01_rtc_fini); 218 219 MODULE_AUTHOR("Geert Uytterhoeven <geert@linux-m68k.org>"); 220 MODULE_LICENSE("GPL"); 221 MODULE_DESCRIPTION("Ricoh RP5C01 RTC driver"); 222 MODULE_ALIAS("platform:rtc-rp5c01"); 223