drivers/reset/reset-rockchip.c

   1 /*
   2  * (C) Copyright 2017 Rockchip Electronics Co., Ltd
   3  *
   4  * SPDX-License-Identifier: GPL-2.0
   5  */
   6
   7 #include <common.h>
   8 #include <dm.h>
   9 #include <reset-uclass.h>
  10 #include <linux/io.h>
  11 #include <asm/arch/hardware.h>
  12 #include <dm/lists.h>
  13 /*
  14  * Each reg has 16 bits reset signal for devices
  15  * Note: Not including rk2818 and older SoCs
  16  */
  17 #define ROCKCHIP_RESET_NUM_IN_REG       16
  18
  19 struct rockchip_reset_priv {
  20         void __iomem *base;
  21         /* Rockchip reset reg locate at cru controller */
  22         u32 reset_reg_offset;
  23         /* Rockchip reset reg number */
  24         u32 reset_reg_num;
  25 };
  26
  27 static int rockchip_reset_request(struct reset_ctl *reset_ctl)
  28 {
  29         struct rockchip_reset_priv *priv = dev_get_priv(reset_ctl->dev);
  30
  31         debug("%s(reset_ctl=%p) (dev=%p, id=%lu) (reg_num=%d)\n", __func__,
  32               reset_ctl, reset_ctl->dev, reset_ctl->id, priv->reset_reg_num);
  33
  34         if (reset_ctl->id / ROCKCHIP_RESET_NUM_IN_REG >= priv->reset_reg_num)
  35                 return -EINVAL;
  36
  37         return 0;
  38 }
  39
  40 static int rockchip_reset_free(struct reset_ctl *reset_ctl)
  41 {
  42         debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, reset_ctl,
  43               reset_ctl->dev, reset_ctl->id);
  44
  45         return 0;
  46 }
  47
  48 static int rockchip_reset_assert(struct reset_ctl *reset_ctl)
  49 {
  50         struct rockchip_reset_priv *priv = dev_get_priv(reset_ctl->dev);
  51         int bank =  reset_ctl->id / ROCKCHIP_RESET_NUM_IN_REG;
  52         int offset =  reset_ctl->id % ROCKCHIP_RESET_NUM_IN_REG;
  53
  54         debug("%s(reset_ctl=%p) (dev=%p, id=%lu) (reg_addr=%p)\n", __func__,
  55               reset_ctl, reset_ctl->dev, reset_ctl->id,
  56               priv->base + (bank * 4));
  57
  58         rk_setreg(priv->base + (bank * 4), BIT(offset));
  59
  60         return 0;
  61 }
  62
  63 static int rockchip_reset_deassert(struct reset_ctl *reset_ctl)
  64 {
  65         struct rockchip_reset_priv *priv = dev_get_priv(reset_ctl->dev);
  66         int bank =  reset_ctl->id / ROCKCHIP_RESET_NUM_IN_REG;
  67         int offset =  reset_ctl->id % ROCKCHIP_RESET_NUM_IN_REG;
  68
  69         debug("%s(reset_ctl=%p) (dev=%p, id=%lu) (reg_addr=%p)\n", __func__,
  70               reset_ctl, reset_ctl->dev, reset_ctl->id,
  71               priv->base + (bank * 4));
  72
  73         rk_clrreg(priv->base + (bank * 4), BIT(offset));
  74
  75         return 0;
  76 }
  77
  78 struct reset_ops rockchip_reset_ops = {
  79         .request = rockchip_reset_request,
  80         .free = rockchip_reset_free,
  81         .rst_assert = rockchip_reset_assert,
  82         .rst_deassert = rockchip_reset_deassert,
  83 };
  84
  85 static int rockchip_reset_probe(struct udevice *dev)
  86 {
  87         struct rockchip_reset_priv *priv = dev_get_priv(dev);
  88         fdt_addr_t addr;
  89         fdt_size_t size;
  90
  91         addr = dev_read_addr_size(dev, "reg", &size);
  92         if (addr == FDT_ADDR_T_NONE)
  93                 return -EINVAL;
  94
  95         if ((priv->reset_reg_offset == 0) && (priv->reset_reg_num == 0))
  96                 return -EINVAL;
  97
  98         addr += priv->reset_reg_offset;
  99         priv->base = ioremap(addr, size);
 100
 101         debug("%s(base=%p) (reg_offset=%x, reg_num=%d)\n", __func__,
 102               priv->base, priv->reset_reg_offset, priv->reset_reg_num);
 103
 104         return 0;
 105 }
 106
 107 int rockchip_reset_bind(struct udevice *pdev, u32 reg_offset, u32 reg_number)
 108 {
 109         struct udevice *rst_dev;
 110         struct rockchip_reset_priv *priv;
 111         int ret;
 112
 113          ret = device_bind_driver_to_node(pdev, "rockchip_reset", "reset",
 114                                           dev_ofnode(pdev), &rst_dev);
 115         if (ret) {
 116                 debug("Warning: No rockchip reset driver: ret=%d\n", ret);
 117                 return ret;
 118         }
 119         priv = malloc(sizeof(struct rockchip_reset_priv));
 120         priv->reset_reg_offset = reg_offset;
 121         priv->reset_reg_num = reg_number;
 122         rst_dev->priv = priv;
 123
 124         return 0;
 125 }
 126
 127 U_BOOT_DRIVER(rockchip_reset) = {
 128         .name = "rockchip_reset",
 129         .id = UCLASS_RESET,
 130         .probe = rockchip_reset_probe,
 131         .ops = &rockchip_reset_ops,
 132         .priv_auto_alloc_size = sizeof(struct rockchip_reset_priv),
 133 };