1 // SPDX-License-Identifier: GPL-2.0
3 * (C) Copyright 2017 Rockchip Electronics Co., Ltd
10 #include <reset-uclass.h>
11 #include <linux/bitops.h>
13 #include <asm/arch-rockchip/hardware.h>
16 * Each reg has 16 bits reset signal for devices
17 * Note: Not including rk2818 and older SoCs
19 #define ROCKCHIP_RESET_NUM_IN_REG 16
21 struct rockchip_reset_priv {
23 /* Rockchip reset reg locate at cru controller */
25 /* Rockchip reset reg number */
29 static int rockchip_reset_request(struct reset_ctl *reset_ctl)
31 struct rockchip_reset_priv *priv = dev_get_priv(reset_ctl->dev);
33 debug("%s(reset_ctl=%p) (dev=%p, id=%lu) (reg_num=%d)\n", __func__,
34 reset_ctl, reset_ctl->dev, reset_ctl->id, priv->reset_reg_num);
36 if (reset_ctl->id / ROCKCHIP_RESET_NUM_IN_REG >= priv->reset_reg_num)
42 static int rockchip_reset_free(struct reset_ctl *reset_ctl)
44 debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, reset_ctl,
45 reset_ctl->dev, reset_ctl->id);
50 static int rockchip_reset_assert(struct reset_ctl *reset_ctl)
52 struct rockchip_reset_priv *priv = dev_get_priv(reset_ctl->dev);
53 int bank = reset_ctl->id / ROCKCHIP_RESET_NUM_IN_REG;
54 int offset = reset_ctl->id % ROCKCHIP_RESET_NUM_IN_REG;
56 debug("%s(reset_ctl=%p) (dev=%p, id=%lu) (reg_addr=%p)\n", __func__,
57 reset_ctl, reset_ctl->dev, reset_ctl->id,
58 priv->base + (bank * 4));
60 rk_setreg(priv->base + (bank * 4), BIT(offset));
65 static int rockchip_reset_deassert(struct reset_ctl *reset_ctl)
67 struct rockchip_reset_priv *priv = dev_get_priv(reset_ctl->dev);
68 int bank = reset_ctl->id / ROCKCHIP_RESET_NUM_IN_REG;
69 int offset = reset_ctl->id % ROCKCHIP_RESET_NUM_IN_REG;
71 debug("%s(reset_ctl=%p) (dev=%p, id=%lu) (reg_addr=%p)\n", __func__,
72 reset_ctl, reset_ctl->dev, reset_ctl->id,
73 priv->base + (bank * 4));
75 rk_clrreg(priv->base + (bank * 4), BIT(offset));
80 struct reset_ops rockchip_reset_ops = {
81 .request = rockchip_reset_request,
82 .rfree = rockchip_reset_free,
83 .rst_assert = rockchip_reset_assert,
84 .rst_deassert = rockchip_reset_deassert,
87 static int rockchip_reset_probe(struct udevice *dev)
89 struct rockchip_reset_priv *priv = dev_get_priv(dev);
93 addr = dev_read_addr_size(dev, "reg", &size);
94 if (addr == FDT_ADDR_T_NONE)
97 if ((priv->reset_reg_offset == 0) && (priv->reset_reg_num == 0))
100 addr += priv->reset_reg_offset;
101 priv->base = ioremap(addr, size);
103 debug("%s(base=%p) (reg_offset=%x, reg_num=%d)\n", __func__,
104 priv->base, priv->reset_reg_offset, priv->reset_reg_num);
109 int rockchip_reset_bind(struct udevice *pdev, u32 reg_offset, u32 reg_number)
111 struct udevice *rst_dev;
112 struct rockchip_reset_priv *priv;
115 ret = device_bind_driver_to_node(pdev, "rockchip_reset", "reset",
116 dev_ofnode(pdev), &rst_dev);
118 debug("Warning: No rockchip reset driver: ret=%d\n", ret);
121 priv = malloc(sizeof(struct rockchip_reset_priv));
122 priv->reset_reg_offset = reg_offset;
123 priv->reset_reg_num = reg_number;
124 rst_dev->priv = priv;
129 U_BOOT_DRIVER(rockchip_reset) = {
130 .name = "rockchip_reset",
132 .probe = rockchip_reset_probe,
133 .ops = &rockchip_reset_ops,
134 .priv_auto_alloc_size = sizeof(struct rockchip_reset_priv),