drivers/sysreset/sysreset_rk3188.c

   1 /*
   2  * (C) Copyright 2015 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 <syscon.h>
  11 #include <sysreset.h>
  12 #include <asm/io.h>
  13 #include <asm/arch/clock.h>
  14 #include <asm/arch/cru_rk3188.h>
  15 #include <asm/arch/grf_rk3188.h>
  16 #include <asm/arch/hardware.h>
  17 #include <linux/err.h>
  18
  19 int rk3188_sysreset_request(struct udevice *dev, enum sysreset_t type)
  20 {
  21         struct rk3188_cru *cru = rockchip_get_cru();
  22         struct rk3188_grf *grf;
  23
  24         if (IS_ERR(cru))
  25                 return PTR_ERR(cru);
  26         switch (type) {
  27         case SYSRESET_WARM:
  28                 grf = syscon_get_first_range(ROCKCHIP_SYSCON_GRF);
  29                 if (IS_ERR(grf))
  30                         return -EPROTONOSUPPORT;
  31
  32                 /*
  33                  * warm-reset keeps the remap value,
  34                  * so make sure it's disabled.
  35                  */
  36                 rk_clrsetreg(&grf->soc_con0,
  37                         NOC_REMAP_MASK << NOC_REMAP_SHIFT,
  38                         0 << NOC_REMAP_SHIFT);
  39
  40                 rk_clrreg(&cru->cru_mode_con, 0xffff);
  41                 writel(0xeca8, &cru->cru_glb_srst_snd_value);
  42                 break;
  43         case SYSRESET_COLD:
  44                 rk_clrreg(&cru->cru_mode_con, 0xffff);
  45                 writel(0xfdb9, &cru->cru_glb_srst_fst_value);
  46                 break;
  47         default:
  48                 return -EPROTONOSUPPORT;
  49         }
  50
  51         return -EINPROGRESS;
  52 }
  53
  54 static struct sysreset_ops rk3188_sysreset = {
  55         .request        = rk3188_sysreset_request,
  56 };
  57
  58 U_BOOT_DRIVER(sysreset_rk3188) = {
  59         .name   = "rk3188_sysreset",
  60         .id     = UCLASS_SYSRESET,
  61         .ops    = &rk3188_sysreset,
  62 };