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
22 struct 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
rockchip_reset_request(struct reset_ctl * reset_ctl)30 static 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
rockchip_reset_free(struct reset_ctl * reset_ctl)43 static 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
rockchip_reset_assert(struct reset_ctl * reset_ctl)51 static 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
rockchip_reset_deassert(struct reset_ctl * reset_ctl)66 static 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
81 struct 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
rockchip_reset_probe(struct udevice * dev)88 static 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
rockchip_reset_bind(struct udevice * pdev,u32 reg_offset,u32 reg_number)110 int 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
130 U_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