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 #include <linux/slab.h> 16 17 18 enum { 19 RP5C01_1_SECOND = 0x0, /* MODE 00 */ 20 RP5C01_10_SECOND = 0x1, /* MODE 00 */ 21 RP5C01_1_MINUTE = 0x2, /* MODE 00 and MODE 01 */ 22 RP5C01_10_MINUTE = 0x3, /* MODE 00 and MODE 01 */ 23 RP5C01_1_HOUR = 0x4, /* MODE 00 and MODE 01 */ 24 RP5C01_10_HOUR = 0x5, /* MODE 00 and MODE 01 */ 25 RP5C01_DAY_OF_WEEK = 0x6, /* MODE 00 and MODE 01 */ 26 RP5C01_1_DAY = 0x7, /* MODE 00 and MODE 01 */ 27 RP5C01_10_DAY = 0x8, /* MODE 00 and MODE 01 */ 28 RP5C01_1_MONTH = 0x9, /* MODE 00 */ 29 RP5C01_10_MONTH = 0xa, /* MODE 00 */ 30 RP5C01_1_YEAR = 0xb, /* MODE 00 */ 31 RP5C01_10_YEAR = 0xc, /* MODE 00 */ 32 33 RP5C01_12_24_SELECT = 0xa, /* MODE 01 */ 34 RP5C01_LEAP_YEAR = 0xb, /* MODE 01 */ 35 36 RP5C01_MODE = 0xd, /* all modes */ 37 RP5C01_TEST = 0xe, /* all modes */ 38 RP5C01_RESET = 0xf, /* all modes */ 39 }; 40 41 #define RP5C01_12_24_SELECT_12 (0 << 0) 42 #define RP5C01_12_24_SELECT_24 (1 << 0) 43 44 #define RP5C01_10_HOUR_AM (0 << 1) 45 #define RP5C01_10_HOUR_PM (1 << 1) 46 47 #define RP5C01_MODE_TIMER_EN (1 << 3) /* timer enable */ 48 #define RP5C01_MODE_ALARM_EN (1 << 2) /* alarm enable */ 49 50 #define RP5C01_MODE_MODE_MASK (3 << 0) 51 #define RP5C01_MODE_MODE00 (0 << 0) /* time */ 52 #define RP5C01_MODE_MODE01 (1 << 0) /* alarm, 12h/24h, leap year */ 53 #define RP5C01_MODE_RAM_BLOCK10 (2 << 0) /* RAM 4 bits x 13 */ 54 #define RP5C01_MODE_RAM_BLOCK11 (3 << 0) /* RAM 4 bits x 13 */ 55 56 #define RP5C01_RESET_1HZ_PULSE (1 << 3) 57 #define RP5C01_RESET_16HZ_PULSE (1 << 2) 58 #define RP5C01_RESET_SECOND (1 << 1) /* reset divider stages for */ 59 /* seconds or smaller units */ 60 #define RP5C01_RESET_ALARM (1 << 0) /* reset all alarm registers */ 61 62 63 struct rp5c01_priv { 64 u32 __iomem *regs; 65 struct rtc_device *rtc; 66 }; 67 68 static inline unsigned int rp5c01_read(struct rp5c01_priv *priv, 69 unsigned int reg) 70 { 71 return __raw_readl(&priv->regs[reg]) & 0xf; 72 } 73 74 static inline void rp5c01_write(struct rp5c01_priv *priv, unsigned int val, 75 unsigned int reg) 76 { 77 return __raw_writel(val, &priv->regs[reg]); 78 } 79 80 static void rp5c01_lock(struct rp5c01_priv *priv) 81 { 82 rp5c01_write(priv, RP5C01_MODE_MODE00, RP5C01_MODE); 83 } 84 85 static void rp5c01_unlock(struct rp5c01_priv *priv) 86 { 87 rp5c01_write(priv, RP5C01_MODE_TIMER_EN | RP5C01_MODE_MODE01, 88 RP5C01_MODE); 89 } 90 91 static int rp5c01_read_time(struct device *dev, struct rtc_time *tm) 92 { 93 struct rp5c01_priv *priv = dev_get_drvdata(dev); 94 95 rp5c01_lock(priv); 96 97 tm->tm_sec = rp5c01_read(priv, RP5C01_10_SECOND) * 10 + 98 rp5c01_read(priv, RP5C01_1_SECOND); 99 tm->tm_min = rp5c01_read(priv, RP5C01_10_MINUTE) * 10 + 100 rp5c01_read(priv, RP5C01_1_MINUTE); 101 tm->tm_hour = rp5c01_read(priv, RP5C01_10_HOUR) * 10 + 102 rp5c01_read(priv, RP5C01_1_HOUR); 103 tm->tm_mday = rp5c01_read(priv, RP5C01_10_DAY) * 10 + 104 rp5c01_read(priv, RP5C01_1_DAY); 105 tm->tm_wday = rp5c01_read(priv, RP5C01_DAY_OF_WEEK); 106 tm->tm_mon = rp5c01_read(priv, RP5C01_10_MONTH) * 10 + 107 rp5c01_read(priv, RP5C01_1_MONTH) - 1; 108 tm->tm_year = rp5c01_read(priv, RP5C01_10_YEAR) * 10 + 109 rp5c01_read(priv, RP5C01_1_YEAR); 110 if (tm->tm_year <= 69) 111 tm->tm_year += 100; 112 113 rp5c01_unlock(priv); 114 115 return rtc_valid_tm(tm); 116 } 117 118 static int rp5c01_set_time(struct device *dev, struct rtc_time *tm) 119 { 120 struct rp5c01_priv *priv = dev_get_drvdata(dev); 121 122 rp5c01_lock(priv); 123 124 rp5c01_write(priv, tm->tm_sec / 10, RP5C01_10_SECOND); 125 rp5c01_write(priv, tm->tm_sec % 10, RP5C01_1_SECOND); 126 rp5c01_write(priv, tm->tm_min / 10, RP5C01_10_MINUTE); 127 rp5c01_write(priv, tm->tm_min % 10, RP5C01_1_MINUTE); 128 rp5c01_write(priv, tm->tm_hour / 10, RP5C01_10_HOUR); 129 rp5c01_write(priv, tm->tm_hour % 10, RP5C01_1_HOUR); 130 rp5c01_write(priv, tm->tm_mday / 10, RP5C01_10_DAY); 131 rp5c01_write(priv, tm->tm_mday % 10, RP5C01_1_DAY); 132 if (tm->tm_wday != -1) 133 rp5c01_write(priv, tm->tm_wday, RP5C01_DAY_OF_WEEK); 134 rp5c01_write(priv, (tm->tm_mon + 1) / 10, RP5C01_10_MONTH); 135 rp5c01_write(priv, (tm->tm_mon + 1) % 10, RP5C01_1_MONTH); 136 if (tm->tm_year >= 100) 137 tm->tm_year -= 100; 138 rp5c01_write(priv, tm->tm_year / 10, RP5C01_10_YEAR); 139 rp5c01_write(priv, tm->tm_year % 10, RP5C01_1_YEAR); 140 141 rp5c01_unlock(priv); 142 return 0; 143 } 144 145 static const struct rtc_class_ops rp5c01_rtc_ops = { 146 .read_time = rp5c01_read_time, 147 .set_time = rp5c01_set_time, 148 }; 149 150 static int __init rp5c01_rtc_probe(struct platform_device *dev) 151 { 152 struct resource *res; 153 struct rp5c01_priv *priv; 154 struct rtc_device *rtc; 155 int error; 156 157 res = platform_get_resource(dev, IORESOURCE_MEM, 0); 158 if (!res) 159 return -ENODEV; 160 161 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 162 if (!priv) 163 return -ENOMEM; 164 165 priv->regs = ioremap(res->start, resource_size(res)); 166 if (!priv->regs) { 167 error = -ENOMEM; 168 goto out_free_priv; 169 } 170 171 rtc = rtc_device_register("rtc-rp5c01", &dev->dev, &rp5c01_rtc_ops, 172 THIS_MODULE); 173 if (IS_ERR(rtc)) { 174 error = PTR_ERR(rtc); 175 goto out_unmap; 176 } 177 178 priv->rtc = rtc; 179 platform_set_drvdata(dev, priv); 180 return 0; 181 182 out_unmap: 183 iounmap(priv->regs); 184 out_free_priv: 185 kfree(priv); 186 return error; 187 } 188 189 static int __exit rp5c01_rtc_remove(struct platform_device *dev) 190 { 191 struct rp5c01_priv *priv = platform_get_drvdata(dev); 192 193 rtc_device_unregister(priv->rtc); 194 iounmap(priv->regs); 195 kfree(priv); 196 return 0; 197 } 198 199 static struct platform_driver rp5c01_rtc_driver = { 200 .driver = { 201 .name = "rtc-rp5c01", 202 .owner = THIS_MODULE, 203 }, 204 .remove = __exit_p(rp5c01_rtc_remove), 205 }; 206 207 static int __init rp5c01_rtc_init(void) 208 { 209 return platform_driver_probe(&rp5c01_rtc_driver, rp5c01_rtc_probe); 210 } 211 212 static void __exit rp5c01_rtc_fini(void) 213 { 214 platform_driver_unregister(&rp5c01_rtc_driver); 215 } 216 217 module_init(rp5c01_rtc_init); 218 module_exit(rp5c01_rtc_fini); 219 220 MODULE_AUTHOR("Geert Uytterhoeven <geert@linux-m68k.org>"); 221 MODULE_LICENSE("GPL"); 222 MODULE_DESCRIPTION("Ricoh RP5C01 RTC driver"); 223 MODULE_ALIAS("platform:rtc-rp5c01"); 224