drivers/sysreset/sysreset_ast.c

   1 /*
   2  * (C) Copyright 2016 Google, Inc
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0
   5  */
   6
   7 #include <common.h>
   8 #include <dm.h>
   9 #include <errno.h>
  10 #include <sysreset.h>
  11 #include <wdt.h>
  12 #include <asm/io.h>
  13 #include <asm/arch/wdt.h>
  14 #include <linux/err.h>
  15
  16 static int ast_sysreset_request(struct udevice *dev, enum sysreset_t type)
  17 {
  18         struct udevice *wdt;
  19         u32 reset_mode;
  20         int ret = uclass_first_device(UCLASS_WDT, &wdt);
  21
  22         if (ret)
  23                 return ret;
  24
  25         switch (type) {
  26         case SYSRESET_WARM:
  27                 reset_mode = WDT_CTRL_RESET_CPU;
  28                 break;
  29         case SYSRESET_COLD:
  30                 reset_mode = WDT_CTRL_RESET_CHIP;
  31                 break;
  32         default:
  33                 return -EPROTONOSUPPORT;
  34         }
  35
  36         ret = wdt_expire_now(wdt, reset_mode);
  37         if (ret) {
  38                 debug("Sysreset failed: %d", ret);
  39                 return ret;
  40         }
  41
  42         return -EINPROGRESS;
  43 }
  44
  45 static struct sysreset_ops ast_sysreset = {
  46         .request        = ast_sysreset_request,
  47 };
  48
  49 U_BOOT_DRIVER(sysreset_ast) = {
  50         .name   = "ast_sysreset",
  51         .id     = UCLASS_SYSRESET,
  52         .ops    = &ast_sysreset,
  53 };