drivers/rtc/sandbox_rtc.c

   1 /*
   2  * (C) Copyright 2015 Google, Inc
   3  * Written by Simon Glass <sjg@chromium.org>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <dm.h>
  10 #include <i2c.h>
  11 #include <rtc.h>
  12 #include <asm/rtc.h>
  13
  14 #define REG_COUNT 0x80
  15
  16 static int sandbox_rtc_get(struct udevice *dev, struct rtc_time *time)
  17 {
  18         time->tm_sec = dm_i2c_reg_read(dev, REG_SEC);
  19         if (time->tm_sec < 0)
  20                 return time->tm_sec;
  21         time->tm_min = dm_i2c_reg_read(dev, REG_MIN);
  22         if (time->tm_min < 0)
  23                 return time->tm_min;
  24         time->tm_hour = dm_i2c_reg_read(dev, REG_HOUR);
  25         if (time->tm_hour < 0)
  26                 return time->tm_hour;
  27         time->tm_mday = dm_i2c_reg_read(dev, REG_MDAY);
  28         if (time->tm_mday < 0)
  29                 return time->tm_mday;
  30         time->tm_mon = dm_i2c_reg_read(dev, REG_MON);
  31         if (time->tm_mon < 0)
  32                 return time->tm_mon;
  33         time->tm_year = dm_i2c_reg_read(dev, REG_YEAR);
  34         if (time->tm_year < 0)
  35                 return time->tm_year;
  36         time->tm_year += 1900;
  37         time->tm_wday = dm_i2c_reg_read(dev, REG_WDAY);
  38         if (time->tm_wday < 0)
  39                 return time->tm_wday;
  40
  41         return 0;
  42 }
  43
  44 static int sandbox_rtc_set(struct udevice *dev, const struct rtc_time *time)
  45 {
  46         int ret;
  47
  48         ret = dm_i2c_reg_write(dev, REG_SEC, time->tm_sec);
  49         if (ret < 0)
  50                 return ret;
  51         ret = dm_i2c_reg_write(dev, REG_MIN, time->tm_min);
  52         if (ret < 0)
  53                 return ret;
  54         ret = dm_i2c_reg_write(dev, REG_HOUR, time->tm_hour);
  55         if (ret < 0)
  56                 return ret;
  57         ret = dm_i2c_reg_write(dev, REG_MDAY, time->tm_mday);
  58         if (ret < 0)
  59                 return ret;
  60         ret = dm_i2c_reg_write(dev, REG_MON, time->tm_mon);
  61         if (ret < 0)
  62                 return ret;
  63         ret = dm_i2c_reg_write(dev, REG_YEAR, time->tm_year - 1900);
  64         if (ret < 0)
  65                 return ret;
  66         ret = dm_i2c_reg_write(dev, REG_WDAY, time->tm_wday);
  67         if (ret < 0)
  68                 return ret;
  69
  70         return 0;
  71 }
  72
  73 static int sandbox_rtc_reset(struct udevice *dev)
  74 {
  75         return dm_i2c_reg_write(dev, REG_RESET, 0);
  76 }
  77
  78 static int sandbox_rtc_read8(struct udevice *dev, unsigned int reg)
  79 {
  80         return dm_i2c_reg_read(dev, reg);
  81 }
  82
  83 static int sandbox_rtc_write8(struct udevice *dev, unsigned int reg, int val)
  84 {
  85         return dm_i2c_reg_write(dev, reg, val);
  86 }
  87
  88 static const struct rtc_ops sandbox_rtc_ops = {
  89         .get = sandbox_rtc_get,
  90         .set = sandbox_rtc_set,
  91         .reset = sandbox_rtc_reset,
  92         .read8 = sandbox_rtc_read8,
  93         .write8 = sandbox_rtc_write8,
  94 };
  95
  96 static const struct udevice_id sandbox_rtc_ids[] = {
  97         { .compatible = "sandbox-rtc" },
  98         { }
  99 };
 100
 101 U_BOOT_DRIVER(rtc_sandbox) = {
 102         .name   = "rtc-sandbox",
 103         .id     = UCLASS_RTC,
 104         .of_match = sandbox_rtc_ids,
 105         .ops    = &sandbox_rtc_ops,
 106 };