LXR uboot/drivers/reset/reset-rockchip.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * (C) Copyright 2017 Rockchip Electronics Co., Ltd
   4 */
   5
   6#include <common.h>
   7#include <dm.h>
   8#include <log.h>
   9#include <malloc.h>
  10#include <reset-uclass.h>
  11#include <linux/bitops.h>
  12#include <linux/io.h>
  13#include <asm/arch-rockchip/hardware.h>
  14#include <dm/device-internal.h>
  15#include <dm/lists.h>
  16/*
  17 * Each reg has 16 bits reset signal for devices
  18 * Note: Not including rk2818 and older SoCs
  19 */
  20#define ROCKCHIP_RESET_NUM_IN_REG       16
  21
  22struct rockchip_reset_priv {
  23        void __iomem *base;
  24        /* Rockchip reset reg locate at cru controller */
  25        u32 reset_reg_offset;
  26        /* Rockchip reset reg number */
  27        u32 reset_reg_num;
  28};
  29
  30static int rockchip_reset_request(struct reset_ctl *reset_ctl)
  31{
  32        struct rockchip_reset_priv *priv = dev_get_priv(reset_ctl->dev);
  33
  34        debug("%s(reset_ctl=%p) (dev=%p, id=%lu) (reg_num=%d)\n", __func__,
  35              reset_ctl, reset_ctl->dev, reset_ctl->id, priv->reset_reg_num);
  36
  37        if (reset_ctl->id / ROCKCHIP_RESET_NUM_IN_REG >= priv->reset_reg_num)
  38                return -EINVAL;
  39
  40        return 0;
  41}
  42
  43static int rockchip_reset_free(struct reset_ctl *reset_ctl)
  44{
  45        debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, reset_ctl,
  46              reset_ctl->dev, reset_ctl->id);
  47
  48        return 0;
  49}
  50
  51static int rockchip_reset_assert(struct reset_ctl *reset_ctl)
  52{
  53        struct rockchip_reset_priv *priv = dev_get_priv(reset_ctl->dev);
  54        int bank =  reset_ctl->id / ROCKCHIP_RESET_NUM_IN_REG;
  55        int offset =  reset_ctl->id % ROCKCHIP_RESET_NUM_IN_REG;
  56
  57        debug("%s(reset_ctl=%p) (dev=%p, id=%lu) (reg_addr=%p)\n", __func__,
  58              reset_ctl, reset_ctl->dev, reset_ctl->id,
  59              priv->base + (bank * 4));
  60
  61        rk_setreg(priv->base + (bank * 4), BIT(offset));
  62
  63        return 0;
  64}
  65
  66static int rockchip_reset_deassert(struct reset_ctl *reset_ctl)
  67{
  68        struct rockchip_reset_priv *priv = dev_get_priv(reset_ctl->dev);
  69        int bank =  reset_ctl->id / ROCKCHIP_RESET_NUM_IN_REG;
  70        int offset =  reset_ctl->id % ROCKCHIP_RESET_NUM_IN_REG;
  71
  72        debug("%s(reset_ctl=%p) (dev=%p, id=%lu) (reg_addr=%p)\n", __func__,
  73              reset_ctl, reset_ctl->dev, reset_ctl->id,
  74              priv->base + (bank * 4));
  75
  76        rk_clrreg(priv->base + (bank * 4), BIT(offset));
  77
  78        return 0;
  79}
  80
  81struct reset_ops rockchip_reset_ops = {
  82        .request = rockchip_reset_request,
  83        .rfree = rockchip_reset_free,
  84        .rst_assert = rockchip_reset_assert,
  85        .rst_deassert = rockchip_reset_deassert,
  86};
  87
  88static int rockchip_reset_probe(struct udevice *dev)
  89{
  90        struct rockchip_reset_priv *priv = dev_get_priv(dev);
  91        fdt_addr_t addr;
  92        fdt_size_t size;
  93
  94        addr = dev_read_addr_size(dev, "reg", &size);
  95        if (addr == FDT_ADDR_T_NONE)
  96                return -EINVAL;
  97
  98        if ((priv->reset_reg_offset == 0) && (priv->reset_reg_num == 0))
  99                return -EINVAL;
 100
 101        addr += priv->reset_reg_offset;
 102        priv->base = ioremap(addr, size);
 103
 104        debug("%s(base=%p) (reg_offset=%x, reg_num=%d)\n", __func__,
 105              priv->base, priv->reset_reg_offset, priv->reset_reg_num);
 106
 107        return 0;
 108}
 109
 110int rockchip_reset_bind(struct udevice *pdev, u32 reg_offset, u32 reg_number)
 111{
 112        struct udevice *rst_dev;
 113        struct rockchip_reset_priv *priv;
 114        int ret;
 115
 116         ret = device_bind_driver_to_node(pdev, "rockchip_reset", "reset",
 117                                          dev_ofnode(pdev), &rst_dev);
 118        if (ret) {
 119                debug("Warning: No rockchip reset driver: ret=%d\n", ret);
 120                return ret;
 121        }
 122        priv = malloc(sizeof(struct rockchip_reset_priv));
 123        priv->reset_reg_offset = reg_offset;
 124        priv->reset_reg_num = reg_number;
 125        dev_set_priv(rst_dev, priv);
 126
 127        return 0;
 128}
 129
 130U_BOOT_DRIVER(rockchip_reset) = {
 131        .name = "rockchip_reset",
 132        .id = UCLASS_RESET,
 133        .probe = rockchip_reset_probe,
 134        .ops = &rockchip_reset_ops,
 135        .priv_auto      = sizeof(struct rockchip_reset_priv),
 136};
 137