/* * 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 */ #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> 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) { return __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_warning("msm6242: 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 rtc_valid_tm(tm); } 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 *dev) { struct resource *res; struct msm6242_priv *priv; struct rtc_device *rtc; int error; res = platform_get_resource(dev, IORESOURCE_MEM, 0); if (!res) return -ENODEV; priv = kzalloc(sizeof(*priv), GFP_KERNEL); if (!priv) return -ENOMEM; priv->regs = ioremap(res->start, resource_size(res)); if (!priv->regs) { error = -ENOMEM; goto out_free_priv; } rtc = rtc_device_register("rtc-msm6242", &dev->dev, &msm6242_rtc_ops, THIS_MODULE); if (IS_ERR(rtc)) { error = PTR_ERR(rtc); goto out_unmap; } priv->rtc = rtc; platform_set_drvdata(dev, priv); return 0; out_unmap: iounmap(priv->regs); out_free_priv: kfree(priv); return error; } static int __exit msm6242_rtc_remove(struct platform_device *dev) { struct msm6242_priv *priv = platform_get_drvdata(dev); rtc_device_unregister(priv->rtc); iounmap(priv->regs); kfree(priv); return 0; } static struct platform_driver msm6242_rtc_driver = { .driver = { .name = "rtc-msm6242", .owner = THIS_MODULE, }, .remove = __exit_p(msm6242_rtc_remove), }; static int __init msm6242_rtc_init(void) { return platform_driver_probe(&msm6242_rtc_driver, msm6242_rtc_probe); } static void __exit msm6242_rtc_fini(void) { platform_driver_unregister(&msm6242_rtc_driver); } module_init(msm6242_rtc_init); module_exit(msm6242_rtc_fini); MODULE_AUTHOR("Geert Uytterhoeven <geert@linux-m68k.org>"); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Oki MSM6242 RTC driver"); MODULE_ALIAS("platform:rtc-msm6242");