target/linux/generic/patches-2.6.37/840-rtc7301.patch

   1 --- a/drivers/rtc/Kconfig
   2 +++ b/drivers/rtc/Kconfig
   3 @@ -665,6 +665,15 @@ config RTC_DRV_NUC900
   4           If you say yes here you get support for the RTC subsystem of the
   5           NUC910/NUC920 used in embedded systems.
   6
   7 +config RTC_DRV_RTC7301
   8 +       tristate "Epson RTC-7301 SF/DG"
   9 +       help
  10 +         If you say Y here you will get support for the
  11 +         Epson RTC-7301 SF/DG RTC chips.
  12 +
  13 +         This driver can also be built as a module. If so, the module
  14 +         will be called rtc-7301.
  15 +
  16  comment "on-CPU RTC drivers"
  17
  18  config RTC_DRV_DAVINCI
  19 --- a/drivers/rtc/Makefile
  20 +++ b/drivers/rtc/Makefile
  21 @@ -82,6 +82,7 @@ obj-$(CONFIG_RTC_DRV_RP5C01)  += rtc-rp5c
  22  obj-$(CONFIG_RTC_DRV_RS5C313)  += rtc-rs5c313.o
  23  obj-$(CONFIG_RTC_DRV_RS5C348)  += rtc-rs5c348.o
  24  obj-$(CONFIG_RTC_DRV_RS5C372)  += rtc-rs5c372.o
  25 +obj-$(CONFIG_RTC_DRV_RTC7301)  += rtc-rtc7301.o
  26  obj-$(CONFIG_RTC_DRV_RX8025)   += rtc-rx8025.o
  27  obj-$(CONFIG_RTC_DRV_RX8581)   += rtc-rx8581.o
  28  obj-$(CONFIG_RTC_DRV_S35390A)  += rtc-s35390a.o
  29 --- /dev/null
  30 +++ b/drivers/rtc/rtc-rtc7301.c
  31 @@ -0,0 +1,219 @@
  32 +/*
  33 + * Driver for Epson RTC-7301SF/DG
  34 + *
  35 + * Copyright (C) 2009 Jose Vasconcellos
  36 + *
  37 + * This program is free software; you can redistribute it and/or modify
  38 + * it under the terms of the GNU General Public License version 2 as
  39 + * published by the Free Software Foundation.
  40 + */
  41 +
  42 +#include <linux/module.h>
  43 +#include <linux/rtc.h>
  44 +#include <linux/platform_device.h>
  45 +#include <linux/io.h>
  46 +#include <linux/delay.h>
  47 +#include <linux/bcd.h>
  48 +
  49 +#define RTC_NAME "rtc7301"
  50 +#define RTC_VERSION "0.1"
  51 +
  52 +/* Epson RTC-7301 register addresses */
  53 +#define RTC7301_SEC            0x00
  54 +#define RTC7301_SEC10          0x01
  55 +#define RTC7301_MIN            0x02
  56 +#define RTC7301_MIN10          0x03
  57 +#define RTC7301_HOUR           0x04
  58 +#define RTC7301_HOUR10         0x05
  59 +#define RTC7301_WEEKDAY                0x06
  60 +#define RTC7301_DAY            0x07
  61 +#define RTC7301_DAY10          0x08
  62 +#define RTC7301_MON            0x09
  63 +#define RTC7301_MON10          0x0A
  64 +#define RTC7301_YEAR           0x0B
  65 +#define RTC7301_YEAR10         0x0C
  66 +#define RTC7301_YEAR100                0x0D
  67 +#define RTC7301_YEAR1000       0x0E
  68 +#define RTC7301_CTRLREG                0x0F
  69 +
  70 +static uint8_t __iomem *rtc7301_base;
  71 +
  72 +#define read_reg(offset) (readb(rtc7301_base + offset) & 0xf)
  73 +#define write_reg(offset, data) writeb(data, rtc7301_base + (offset))
  74 +
  75 +#define rtc7301_isbusy() (read_reg(RTC7301_CTRLREG) & 1)
  76 +
  77 +static void rtc7301_init_settings(void)
  78 +{
  79 +       int i;
  80 +
  81 +       write_reg(RTC7301_CTRLREG, 2);
  82 +       write_reg(RTC7301_YEAR1000, 2);
  83 +       udelay(122);
  84 +
  85 +       /* bank 1 */
  86 +       write_reg(RTC7301_CTRLREG, 6);
  87 +       for (i=0; i<15; i++)
  88 +               write_reg(i, 0);
  89 +
  90 +       /* bank 2 */
  91 +       write_reg(RTC7301_CTRLREG, 14);
  92 +       for (i=0; i<15; i++)
  93 +               write_reg(i, 0);
  94 +       write_reg(RTC7301_CTRLREG, 0);
  95 +}
  96 +
  97 +static int rtc7301_get_datetime(struct device *dev, struct rtc_time *dt)
  98 +{
  99 +       int cnt;
 100 +       uint8_t buf[16];
 101 +
 102 +       cnt = 0;
 103 +       while (rtc7301_isbusy()) {
 104 +               udelay(244);
 105 +               if (cnt++ > 100) {
 106 +                       dev_err(dev, "%s: timeout error %x\n", __func__, rtc7301_base[RTC7301_CTRLREG]);
 107 +                       return -EIO;
 108 +               }
 109 +       }
 110 +
 111 +       for (cnt=0; cnt<16; cnt++)
 112 +               buf[cnt] = read_reg(cnt);
 113 +
 114 +       if (buf[RTC7301_SEC10] & 8) {
 115 +               dev_err(dev, "%s: RTC not set\n", __func__);
 116 +               return -EINVAL;
 117 +       }
 118 +
 119 +       memset(dt, 0, sizeof(*dt));
 120 +
 121 +       dt->tm_sec =  buf[RTC7301_SEC] + buf[RTC7301_SEC10]*10;
 122 +       dt->tm_min =  buf[RTC7301_MIN] + buf[RTC7301_MIN10]*10;
 123 +       dt->tm_hour = buf[RTC7301_HOUR] + buf[RTC7301_HOUR10]*10;
 124 +
 125 +       dt->tm_mday = buf[RTC7301_DAY] + buf[RTC7301_DAY10]*10;
 126 +       dt->tm_mon =  buf[RTC7301_MON] + buf[RTC7301_MON10]*10 - 1;
 127 +       dt->tm_year = buf[RTC7301_YEAR] + buf[RTC7301_YEAR10]*10 +
 128 +                     buf[RTC7301_YEAR100]*100 +
 129 +                     ((buf[RTC7301_YEAR1000] & 3)*1000) - 1900;
 130 +
 131 +       /* the rtc device may contain illegal values on power up
 132 +        * according to the data sheet. make sure they are valid.
 133 +        */
 134 +
 135 +       return rtc_valid_tm(dt);
 136 +}
 137 +
 138 +static int rtc7301_set_datetime(struct device *dev, struct rtc_time *dt)
 139 +{
 140 +       int data;
 141 +
 142 +       data = dt->tm_year + 1900;
 143 +       if (data >= 2100 || data < 1900)
 144 +               return -EINVAL;
 145 +
 146 +       write_reg(RTC7301_CTRLREG, 2);
 147 +               udelay(122);
 148 +
 149 +       data = bin2bcd(dt->tm_sec);
 150 +       write_reg(RTC7301_SEC, data);
 151 +       write_reg(RTC7301_SEC10, (data >> 4));
 152 +
 153 +       data = bin2bcd(dt->tm_min);
 154 +       write_reg(RTC7301_MIN, data );
 155 +       write_reg(RTC7301_MIN10, (data >> 4));
 156 +
 157 +       data = bin2bcd(dt->tm_hour);
 158 +       write_reg(RTC7301_HOUR, data);
 159 +       write_reg(RTC7301_HOUR10, (data >> 4));
 160 +
 161 +       data = bin2bcd(dt->tm_mday);
 162 +       write_reg(RTC7301_DAY, data);
 163 +       write_reg(RTC7301_DAY10, (data>> 4));
 164 +
 165 +       data = bin2bcd(dt->tm_mon + 1);
 166 +       write_reg(RTC7301_MON, data);
 167 +       write_reg(RTC7301_MON10, (data >> 4));
 168 +
 169 +       data = bin2bcd(dt->tm_year % 100);
 170 +       write_reg(RTC7301_YEAR, data);
 171 +       write_reg(RTC7301_YEAR10, (data >> 4));
 172 +       data = bin2bcd((1900 + dt->tm_year) / 100);
 173 +       write_reg(RTC7301_YEAR100, data);
 174 +
 175 +       data = bin2bcd(dt->tm_wday);
 176 +       write_reg(RTC7301_WEEKDAY, data);
 177 +
 178 +       write_reg(RTC7301_CTRLREG, 0);
 179 +
 180 +       return 0;
 181 +}
 182 +
 183 +static const struct rtc_class_ops rtc7301_rtc_ops = {
 184 +       .read_time      = rtc7301_get_datetime,
 185 +       .set_time       = rtc7301_set_datetime,
 186 +};
 187 +
 188 +static int __devinit rtc7301_probe(struct platform_device *pdev)
 189 +{
 190 +       struct rtc_device *rtc;
 191 +       struct resource *res;
 192 +
 193 +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 194 +       if (!res)
 195 +               return -ENOENT;
 196 +
 197 +       rtc7301_base = ioremap_nocache(res->start, 0x1000 /*res->end - res->start + 1*/);
 198 +       if (!rtc7301_base)
 199 +               return -EINVAL;
 200 +
 201 +       rtc = rtc_device_register(RTC_NAME, &pdev->dev,
 202 +                               &rtc7301_rtc_ops, THIS_MODULE);
 203 +       if (IS_ERR(rtc)) {
 204 +               iounmap(rtc7301_base);
 205 +               return PTR_ERR(rtc);
 206 +       }
 207 +
 208 +       platform_set_drvdata(pdev, rtc);
 209 +
 210 +       rtc7301_init_settings();
 211 +       return 0;
 212 +}
 213 +
 214 +static int __devexit rtc7301_remove(struct platform_device *pdev)
 215 +{
 216 +       struct rtc_device *rtc = platform_get_drvdata(pdev);
 217 +
 218 +       if (rtc)
 219 +               rtc_device_unregister(rtc);
 220 +       if (rtc7301_base)
 221 +               iounmap(rtc7301_base);
 222 +       return 0;
 223 +}
 224 +
 225 +static struct platform_driver rtc7301_driver = {
 226 +       .driver = {
 227 +               .name   = RTC_NAME,
 228 +               .owner  = THIS_MODULE,
 229 +       },
 230 +       .probe  = rtc7301_probe,
 231 +       .remove = __devexit_p(rtc7301_remove),
 232 +};
 233 +
 234 +static __init int rtc7301_init(void)
 235 +{
 236 +       return platform_driver_register(&rtc7301_driver);
 237 +}
 238 +module_init(rtc7301_init);
 239 +
 240 +static __exit void rtc7301_exit(void)
 241 +{
 242 +       platform_driver_unregister(&rtc7301_driver);
 243 +}
 244 +module_exit(rtc7301_exit);
 245 +
 246 +MODULE_DESCRIPTION("Epson 7301 RTC driver");
 247 +MODULE_AUTHOR("Jose Vasconcellos <jvasco@verizon.net>");
 248 +MODULE_LICENSE("GPL");
 249 +MODULE_ALIAS("platform:" RTC_NAME);
 250 +MODULE_VERSION(RTC_VERSION);