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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 | // SPDX-License-Identifier: GPL-2.0-only /* * Oki MSM6242 RTC Driver * * Copyright 2009 Geert Uytterhoeven * * Based on the A2000 TOD code in arch/m68k/amiga/config.c * Copyright (C) 1993 Hamish Macdonald */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/delay.h> #include <linux/io.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/rtc.h> #include <linux/slab.h> enum { MSM6242_SECOND1 = 0x0, /* 1-second digit register */ MSM6242_SECOND10 = 0x1, /* 10-second digit register */ MSM6242_MINUTE1 = 0x2, /* 1-minute digit register */ MSM6242_MINUTE10 = 0x3, /* 10-minute digit register */ MSM6242_HOUR1 = 0x4, /* 1-hour digit register */ MSM6242_HOUR10 = 0x5, /* PM/AM, 10-hour digit register */ MSM6242_DAY1 = 0x6, /* 1-day digit register */ MSM6242_DAY10 = 0x7, /* 10-day digit register */ MSM6242_MONTH1 = 0x8, /* 1-month digit register */ MSM6242_MONTH10 = 0x9, /* 10-month digit register */ MSM6242_YEAR1 = 0xa, /* 1-year digit register */ MSM6242_YEAR10 = 0xb, /* 10-year digit register */ MSM6242_WEEK = 0xc, /* Week register */ MSM6242_CD = 0xd, /* Control Register D */ MSM6242_CE = 0xe, /* Control Register E */ MSM6242_CF = 0xf, /* Control Register F */ }; #define MSM6242_HOUR10_AM (0 << 2) #define MSM6242_HOUR10_PM (1 << 2) #define MSM6242_HOUR10_HR_MASK (3 << 0) #define MSM6242_WEEK_SUNDAY 0 #define MSM6242_WEEK_MONDAY 1 #define MSM6242_WEEK_TUESDAY 2 #define MSM6242_WEEK_WEDNESDAY 3 #define MSM6242_WEEK_THURSDAY 4 #define MSM6242_WEEK_FRIDAY 5 #define MSM6242_WEEK_SATURDAY 6 #define MSM6242_CD_30_S_ADJ (1 << 3) /* 30-second adjustment */ #define MSM6242_CD_IRQ_FLAG (1 << 2) #define MSM6242_CD_BUSY (1 << 1) #define MSM6242_CD_HOLD (1 << 0) #define MSM6242_CE_T_MASK (3 << 2) #define MSM6242_CE_T_64HZ (0 << 2) /* period 1/64 second */ #define MSM6242_CE_T_1HZ (1 << 2) /* period 1 second */ #define MSM6242_CE_T_1MINUTE (2 << 2) /* period 1 minute */ #define MSM6242_CE_T_1HOUR (3 << 2) /* period 1 hour */ #define MSM6242_CE_ITRPT_STND (1 << 1) #define MSM6242_CE_MASK (1 << 0) /* STD.P output control */ #define MSM6242_CF_TEST (1 << 3) #define MSM6242_CF_12H (0 << 2) #define MSM6242_CF_24H (1 << 2) #define MSM6242_CF_STOP (1 << 1) #define MSM6242_CF_REST (1 << 0) /* reset */ struct msm6242_priv { u32 __iomem *regs; struct rtc_device *rtc; }; static inline unsigned int msm6242_read(struct msm6242_priv *priv, unsigned int reg) { return __raw_readl(&priv->regs[reg]) & 0xf; } static inline void msm6242_write(struct msm6242_priv *priv, unsigned int val, unsigned int reg) { __raw_writel(val, &priv->regs[reg]); } static inline void msm6242_set(struct msm6242_priv *priv, unsigned int val, unsigned int reg) { msm6242_write(priv, msm6242_read(priv, reg) | val, reg); } static inline void msm6242_clear(struct msm6242_priv *priv, unsigned int val, unsigned int reg) { msm6242_write(priv, msm6242_read(priv, reg) & ~val, reg); } static void msm6242_lock(struct msm6242_priv *priv) { int cnt = 5; msm6242_set(priv, MSM6242_CD_HOLD, MSM6242_CD); while ((msm6242_read(priv, MSM6242_CD) & MSM6242_CD_BUSY) && cnt) { msm6242_clear(priv, MSM6242_CD_HOLD, MSM6242_CD); udelay(70); msm6242_set(priv, MSM6242_CD_HOLD, MSM6242_CD); cnt--; } if (!cnt) pr_warn("timed out waiting for RTC (0x%x)\n", msm6242_read(priv, MSM6242_CD)); } static void msm6242_unlock(struct msm6242_priv *priv) { msm6242_clear(priv, MSM6242_CD_HOLD, MSM6242_CD); } static int msm6242_read_time(struct device *dev, struct rtc_time *tm) { struct msm6242_priv *priv = dev_get_drvdata(dev); msm6242_lock(priv); tm->tm_sec = msm6242_read(priv, MSM6242_SECOND10) * 10 + msm6242_read(priv, MSM6242_SECOND1); tm->tm_min = msm6242_read(priv, MSM6242_MINUTE10) * 10 + msm6242_read(priv, MSM6242_MINUTE1); tm->tm_hour = (msm6242_read(priv, MSM6242_HOUR10 & 3)) * 10 + msm6242_read(priv, MSM6242_HOUR1); tm->tm_mday = msm6242_read(priv, MSM6242_DAY10) * 10 + msm6242_read(priv, MSM6242_DAY1); tm->tm_wday = msm6242_read(priv, MSM6242_WEEK); tm->tm_mon = msm6242_read(priv, MSM6242_MONTH10) * 10 + msm6242_read(priv, MSM6242_MONTH1) - 1; tm->tm_year = msm6242_read(priv, MSM6242_YEAR10) * 10 + msm6242_read(priv, MSM6242_YEAR1); if (tm->tm_year <= 69) tm->tm_year += 100; if (!(msm6242_read(priv, MSM6242_CF) & MSM6242_CF_24H)) { unsigned int pm = msm6242_read(priv, MSM6242_HOUR10) & MSM6242_HOUR10_PM; if (!pm && tm->tm_hour == 12) tm->tm_hour = 0; else if (pm && tm->tm_hour != 12) tm->tm_hour += 12; } msm6242_unlock(priv); return 0; } static int msm6242_set_time(struct device *dev, struct rtc_time *tm) { struct msm6242_priv *priv = dev_get_drvdata(dev); msm6242_lock(priv); msm6242_write(priv, tm->tm_sec / 10, MSM6242_SECOND10); msm6242_write(priv, tm->tm_sec % 10, MSM6242_SECOND1); msm6242_write(priv, tm->tm_min / 10, MSM6242_MINUTE10); msm6242_write(priv, tm->tm_min % 10, MSM6242_MINUTE1); if (msm6242_read(priv, MSM6242_CF) & MSM6242_CF_24H) msm6242_write(priv, tm->tm_hour / 10, MSM6242_HOUR10); else if (tm->tm_hour >= 12) msm6242_write(priv, MSM6242_HOUR10_PM + (tm->tm_hour - 12) / 10, MSM6242_HOUR10); else msm6242_write(priv, tm->tm_hour / 10, MSM6242_HOUR10); msm6242_write(priv, tm->tm_hour % 10, MSM6242_HOUR1); msm6242_write(priv, tm->tm_mday / 10, MSM6242_DAY10); msm6242_write(priv, tm->tm_mday % 10, MSM6242_DAY1); if (tm->tm_wday != -1) msm6242_write(priv, tm->tm_wday, MSM6242_WEEK); msm6242_write(priv, (tm->tm_mon + 1) / 10, MSM6242_MONTH10); msm6242_write(priv, (tm->tm_mon + 1) % 10, MSM6242_MONTH1); if (tm->tm_year >= 100) tm->tm_year -= 100; msm6242_write(priv, tm->tm_year / 10, MSM6242_YEAR10); msm6242_write(priv, tm->tm_year % 10, MSM6242_YEAR1); msm6242_unlock(priv); return 0; } static const struct rtc_class_ops msm6242_rtc_ops = { .read_time = msm6242_read_time, .set_time = msm6242_set_time, }; static int __init msm6242_rtc_probe(struct platform_device *pdev) { struct resource *res; struct msm6242_priv *priv; struct rtc_device *rtc; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) return -ENODEV; priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); if (!priv) return -ENOMEM; priv->regs = devm_ioremap(&pdev->dev, res->start, resource_size(res)); if (!priv->regs) return -ENOMEM; platform_set_drvdata(pdev, priv); rtc = devm_rtc_device_register(&pdev->dev, "rtc-msm6242", &msm6242_rtc_ops, THIS_MODULE); if (IS_ERR(rtc)) return PTR_ERR(rtc); priv->rtc = rtc; return 0; } static struct platform_driver msm6242_rtc_driver = { .driver = { .name = "rtc-msm6242", }, }; module_platform_driver_probe(msm6242_rtc_driver, msm6242_rtc_probe); MODULE_AUTHOR("Geert Uytterhoeven <geert@linux-m68k.org>"); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Oki MSM6242 RTC driver"); MODULE_ALIAS("platform:rtc-msm6242"); |