drivers/rtc/sandbox_rtc.c

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