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 #include <dm/acpi.h>
  13
  14 #define REG_COUNT 0x80
  15
  16 static int sandbox_rtc_get(struct udevice *dev, struct rtc_time *time)
  17 {
  18         u8 buf[7];
  19         int ret;
  20
  21         ret = dm_i2c_read(dev, REG_SEC, buf, sizeof(buf));
  22         if (ret < 0)
  23                 return ret;
  24
  25         time->tm_sec  = buf[REG_SEC - REG_SEC];
  26         time->tm_min  = buf[REG_MIN - REG_SEC];
  27         time->tm_hour = buf[REG_HOUR - REG_SEC];
  28         time->tm_mday = buf[REG_MDAY - REG_SEC];
  29         time->tm_mon  = buf[REG_MON - REG_SEC];
  30         time->tm_year = buf[REG_YEAR - REG_SEC] + 1900;
  31         time->tm_wday = buf[REG_WDAY - REG_SEC];
  32
  33         return 0;
  34 }
  35
  36 static int sandbox_rtc_set(struct udevice *dev, const struct rtc_time *time)
  37 {
  38         u8 buf[7];
  39         int ret;
  40
  41         buf[REG_SEC - REG_SEC]  = time->tm_sec;
  42         buf[REG_MIN - REG_SEC]  = time->tm_min;
  43         buf[REG_HOUR - REG_SEC] = time->tm_hour;
  44         buf[REG_MDAY - REG_SEC] = time->tm_mday;
  45         buf[REG_MON  - REG_SEC] = time->tm_mon;
  46         buf[REG_YEAR - REG_SEC] = time->tm_year - 1900;
  47         buf[REG_WDAY - REG_SEC] = time->tm_wday;
  48
  49         ret = dm_i2c_write(dev, REG_SEC, buf, sizeof(buf));
  50         if (ret < 0)
  51                 return ret;
  52
  53         return 0;
  54 }
  55
  56 static int sandbox_rtc_reset(struct udevice *dev)
  57 {
  58         return dm_i2c_reg_write(dev, REG_RESET, 0);
  59 }
  60
  61 static int sandbox_rtc_read8(struct udevice *dev, unsigned int reg)
  62 {
  63         return dm_i2c_reg_read(dev, reg);
  64 }
  65
  66 static int sandbox_rtc_write8(struct udevice *dev, unsigned int reg, int val)
  67 {
  68         return dm_i2c_reg_write(dev, reg, val);
  69 }
  70
  71 #if CONFIG_IS_ENABLED(ACPIGEN)
  72 static int sandbox_rtc_get_name(const struct udevice *dev, char *out_name)
  73 {
  74         return acpi_copy_name(out_name, "RTCC");
  75 }
  76
  77 struct acpi_ops sandbox_rtc_acpi_ops = {
  78         .get_name       = sandbox_rtc_get_name,
  79 };
  80 #endif
  81
  82 static const struct rtc_ops sandbox_rtc_ops = {
  83         .get = sandbox_rtc_get,
  84         .set = sandbox_rtc_set,
  85         .reset = sandbox_rtc_reset,
  86         .read8 = sandbox_rtc_read8,
  87         .write8 = sandbox_rtc_write8,
  88 };
  89
  90 static const struct udevice_id sandbox_rtc_ids[] = {
  91         { .compatible = "sandbox-rtc" },
  92         { }
  93 };
  94
  95 U_BOOT_DRIVER(sandbox_rtc) = {
  96         .name   = "sandbox_rtc",
  97         .id     = UCLASS_RTC,
  98         .of_match = sandbox_rtc_ids,
  99         .ops    = &sandbox_rtc_ops,
 100         ACPI_OPS_PTR(&sandbox_rtc_acpi_ops)
 101 };