drivers/sysreset/sysreset_rk3368.c

   1 /*
   2  * (C) Copyright Rockchip Electronics Co., Ltd
   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 <asm/io.h>
  12 #include <asm/arch/clock.h>
  13 #include <asm/arch/cru_rk3368.h>
  14 #include <asm/arch/hardware.h>
  15 #include <linux/err.h>
  16
  17 static void rk3368_pll_enter_slow_mode(struct rk3368_cru *cru)
  18 {
  19         struct rk3368_pll *pll;
  20         int i;
  21
  22         for (i = 0; i < 6; i++) {
  23                 pll = &cru->pll[i];
  24                 rk_clrreg(&pll->con3, PLL_MODE_MASK);
  25         }
  26 }
  27
  28 static int rk3368_sysreset_request(struct udevice *dev, enum sysreset_t type)
  29 {
  30         struct rk3368_cru *cru = rockchip_get_cru();
  31
  32         if (IS_ERR(cru))
  33                 return PTR_ERR(cru);
  34         switch (type) {
  35         case SYSRESET_WARM:
  36                 rk3368_pll_enter_slow_mode(cru);
  37                 rk_clrsetreg(&cru->glb_rst_con, PMU_GLB_SRST_CTRL_MASK,
  38                              PMU_RST_BY_SND_GLB_SRST << PMU_GLB_SRST_CTRL_SHIFT);
  39                 writel(0xeca8, &cru->glb_srst_snd_val);
  40                 break;
  41         case SYSRESET_COLD:
  42                 rk3368_pll_enter_slow_mode(cru);
  43                 rk_clrsetreg(&cru->glb_rst_con, PMU_GLB_SRST_CTRL_MASK,
  44                              PMU_RST_BY_FST_GLB_SRST << PMU_GLB_SRST_CTRL_SHIFT);
  45                 writel(0xfdb9, &cru->glb_srst_fst_val);
  46                 break;
  47         default:
  48                 return -EPROTONOSUPPORT;
  49         }
  50
  51         return -EINPROGRESS;
  52 }
  53
  54 static struct sysreset_ops rk3368_sysreset = {
  55         .request        = rk3368_sysreset_request,
  56 };
  57
  58 U_BOOT_DRIVER(sysreset_rk3368) = {
  59         .name   = "rk3368_sysreset",
  60         .id     = UCLASS_SYSRESET,
  61         .ops    = &rk3368_sysreset,
  62 };