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    Subject[PATCH/RFC 14/16] rtc: Add an RTC driver for the Oki MSM6242
    Date
    Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
    Cc: rtc-linux@googlegroups.com
    ---
    drivers/rtc/Kconfig | 9 ++
    drivers/rtc/Makefile | 1 +
    drivers/rtc/rtc-msm6242.c | 285 +++++++++++++++++++++++++++++++++++++++++++++
    3 files changed, 295 insertions(+), 0 deletions(-)
    create mode 100644 drivers/rtc/rtc-msm6242.c

    diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
    index ffe34a1..a0f6297 100644
    --- a/drivers/rtc/Kconfig
    +++ b/drivers/rtc/Kconfig
    @@ -526,6 +526,15 @@ config RTC_DRV_PCF50633
    If you say yes here you get support for the RTC subsystem of the
    NXP PCF50633 used in embedded systems.

    +config RTC_DRV_MSM6242
    + tristate "Oki MSM6242"
    + help
    + If you say yes here you get support for the Oki MSM6242
    + timekeeping chip. It is used in some Amiga models (e.g. A2000).
    +
    + This driver can also be built as a module. If so, the module
    + will be called rtc-msm6242.
    +
    comment "on-CPU RTC drivers"

    config RTC_DRV_OMAP
    diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
    index 6c0639a..c70418b 100644
    --- a/drivers/rtc/Makefile
    +++ b/drivers/rtc/Makefile
    @@ -76,4 +76,5 @@ obj-$(CONFIG_RTC_DRV_VR41XX) += rtc-vr41xx.o
    obj-$(CONFIG_RTC_DRV_WM8350) += rtc-wm8350.o
    obj-$(CONFIG_RTC_DRV_X1205) += rtc-x1205.o
    obj-$(CONFIG_RTC_DRV_PCF50633) += rtc-pcf50633.o
    +obj-$(CONFIG_RTC_DRV_MSM6242) += rtc-msm6242.o
    obj-$(CONFIG_RTC_DRV_PS3) += rtc-ps3.o
    diff --git a/drivers/rtc/rtc-msm6242.c b/drivers/rtc/rtc-msm6242.c
    new file mode 100644
    index 0000000..c3af4f8
    --- /dev/null
    +++ b/drivers/rtc/rtc-msm6242.c
    @@ -0,0 +1,285 @@
    +/*
    + * 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);
    + }
    +
    + 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 int msm6242_set_mmss(struct device *dev, unsigned long secs)
    +{
    + struct msm6242_priv *priv = dev_get_drvdata(dev);
    + unsigned int real_seconds = secs % 60, real_minutes = (secs / 60) % 60;
    +
    + msm6242_lock(priv);
    +
    + msm6242_write(priv, real_seconds / 10, MSM6242_SECOND10);
    + msm6242_write(priv, real_seconds % 10, MSM6242_SECOND1);
    + msm6242_write(priv, real_minutes / 10, MSM6242_MINUTE10);
    + msm6242_write(priv, real_minutes % 10, MSM6242_MINUTE1);
    +
    + msm6242_unlock(priv);
    + return 0;
    +}
    +
    +static const struct rtc_class_ops msm6242_rtc_ops = {
    + .read_time = msm6242_read_time,
    + .set_time = msm6242_set_time,
    + .set_mmss = msm6242_set_mmss,
    +};
    +
    +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");
    +MODULE_LICENSE("GPL");
    +MODULE_DESCRIPTION("Oki MSM6242 RTC driver");
    +MODULE_ALIAS("platform:rtc-msm6242");
    --
    1.6.2.3


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