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         u8 buf[7];
  18         int ret;
  19
  20         ret = dm_i2c_read(dev, REG_SEC, buf, sizeof(buf));
  21         if (ret < 0)
  22                 return ret;
  23
  24         time->tm_sec  = buf[REG_SEC - REG_SEC];
  25         time->tm_min  = buf[REG_MIN - REG_SEC];
  26         time->tm_hour = buf[REG_HOUR - REG_SEC];
  27         time->tm_mday = buf[REG_MDAY - REG_SEC];
  28         time->tm_mon  = buf[REG_MON - REG_SEC];
  29         time->tm_year = buf[REG_YEAR - REG_SEC] + 1900;
  30         time->tm_wday = buf[REG_WDAY - REG_SEC];
  31
  32         return 0;
  33 }
  34
  35 static int sandbox_rtc_set(struct udevice *dev, const struct rtc_time *time)
  36 {
  37         u8 buf[7];
  38         int ret;
  39
  40         buf[REG_SEC - REG_SEC]  = time->tm_sec;
  41         buf[REG_MIN - REG_SEC]  = time->tm_min;
  42         buf[REG_HOUR - REG_SEC] = time->tm_hour;
  43         buf[REG_MDAY - REG_SEC] = time->tm_mday;
  44         buf[REG_MON  - REG_SEC] = time->tm_mon;
  45         buf[REG_YEAR - REG_SEC] = time->tm_year - 1900;
  46         buf[REG_WDAY - REG_SEC] = time->tm_wday;
  47
  48         ret = dm_i2c_write(dev, REG_SEC, buf, sizeof(buf));
  49         if (ret < 0)
  50                 return ret;
  51
  52         return 0;
  53 }
  54
  55 static int sandbox_rtc_reset(struct udevice *dev)
  56 {
  57         return dm_i2c_reg_write(dev, REG_RESET, 0);
  58 }
  59
  60 static int sandbox_rtc_read8(struct udevice *dev, unsigned int reg)
  61 {
  62         return dm_i2c_reg_read(dev, reg);
  63 }
  64
  65 static int sandbox_rtc_write8(struct udevice *dev, unsigned int reg, int val)
  66 {
  67         return dm_i2c_reg_write(dev, reg, val);
  68 }
  69
  70 static const struct rtc_ops sandbox_rtc_ops = {
  71         .get = sandbox_rtc_get,
  72         .set = sandbox_rtc_set,
  73         .reset = sandbox_rtc_reset,
  74         .read8 = sandbox_rtc_read8,
  75         .write8 = sandbox_rtc_write8,
  76 };
  77
  78 static const struct udevice_id sandbox_rtc_ids[] = {
  79         { .compatible = "sandbox-rtc" },
  80         { }
  81 };
  82
  83 U_BOOT_DRIVER(rtc_sandbox) = {
  84         .name   = "rtc-sandbox",
  85         .id     = UCLASS_RTC,
  86         .of_match = sandbox_rtc_ids,
  87         .ops    = &sandbox_rtc_ops,
  88 };