1 // SPDX-License-Identifier: GPL-2.0
3 * (C) Copyright 2017 Rockchip Electronics Co., Ltd
9 #include <reset-uclass.h>
11 #include <asm/arch-rockchip/hardware.h>
14 * Each reg has 16 bits reset signal for devices
15 * Note: Not including rk2818 and older SoCs
17 #define ROCKCHIP_RESET_NUM_IN_REG 16
19 struct rockchip_reset_priv {
21 /* Rockchip reset reg locate at cru controller */
23 /* Rockchip reset reg number */
27 static int rockchip_reset_request(struct reset_ctl *reset_ctl)
29 struct rockchip_reset_priv *priv = dev_get_priv(reset_ctl->dev);
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);
34 if (reset_ctl->id / ROCKCHIP_RESET_NUM_IN_REG >= priv->reset_reg_num)
40 static int rockchip_reset_free(struct reset_ctl *reset_ctl)
42 debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, reset_ctl,
43 reset_ctl->dev, reset_ctl->id);
48 static int rockchip_reset_assert(struct reset_ctl *reset_ctl)
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;
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));
58 rk_setreg(priv->base + (bank * 4), BIT(offset));
63 static int rockchip_reset_deassert(struct reset_ctl *reset_ctl)
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;
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));
73 rk_clrreg(priv->base + (bank * 4), BIT(offset));
78 struct reset_ops rockchip_reset_ops = {
79 .request = rockchip_reset_request,
80 .rfree = rockchip_reset_free,
81 .rst_assert = rockchip_reset_assert,
82 .rst_deassert = rockchip_reset_deassert,
85 static int rockchip_reset_probe(struct udevice *dev)
87 struct rockchip_reset_priv *priv = dev_get_priv(dev);
91 addr = dev_read_addr_size(dev, "reg", &size);
92 if (addr == FDT_ADDR_T_NONE)
95 if ((priv->reset_reg_offset == 0) && (priv->reset_reg_num == 0))
98 addr += priv->reset_reg_offset;
99 priv->base = ioremap(addr, size);
101 debug("%s(base=%p) (reg_offset=%x, reg_num=%d)\n", __func__,
102 priv->base, priv->reset_reg_offset, priv->reset_reg_num);
107 int rockchip_reset_bind(struct udevice *pdev, u32 reg_offset, u32 reg_number)
109 struct udevice *rst_dev;
110 struct rockchip_reset_priv *priv;
113 ret = device_bind_driver_to_node(pdev, "rockchip_reset", "reset",
114 dev_ofnode(pdev), &rst_dev);
116 debug("Warning: No rockchip reset driver: ret=%d\n", ret);
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;
127 U_BOOT_DRIVER(rockchip_reset) = {
128 .name = "rockchip_reset",
130 .probe = rockchip_reset_probe,
131 .ops = &rockchip_reset_ops,
132 .priv_auto_alloc_size = sizeof(struct rockchip_reset_priv),