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 const int *lut;
25 /* Rockchip reset reg locate at cru controller */
26 u32 reset_reg_offset;
27 /* Rockchip reset reg number */
28 u32 reset_reg_num;
29 };
30
rockchip_reset_request(struct reset_ctl * reset_ctl)31 static int rockchip_reset_request(struct reset_ctl *reset_ctl)
32 {
33 struct rockchip_reset_priv *priv = dev_get_priv(reset_ctl->dev);
34 unsigned long id = reset_ctl->id;
35
36 if (priv->lut)
37 id = priv->lut[id];
38
39 debug("%s(reset_ctl=%p) (dev=%p, id=%lu) (reg_num=%d)\n", __func__,
40 reset_ctl, reset_ctl->dev, id, priv->reset_reg_num);
41
42 if (id / ROCKCHIP_RESET_NUM_IN_REG >= priv->reset_reg_num)
43 return -EINVAL;
44
45 return 0;
46 }
47
rockchip_reset_assert(struct reset_ctl * reset_ctl)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 unsigned long id = reset_ctl->id;
52 int bank, offset;
53
54 if (priv->lut)
55 id = priv->lut[id];
56
57 bank = id / ROCKCHIP_RESET_NUM_IN_REG;
58 offset = id % ROCKCHIP_RESET_NUM_IN_REG;
59
60 debug("%s(reset_ctl=%p) (dev=%p, id=%lu) (reg_addr=%p)\n", __func__,
61 reset_ctl, reset_ctl->dev, id, priv->base + (bank * 4));
62
63 rk_setreg(priv->base + (bank * 4), BIT(offset));
64
65 return 0;
66 }
67
rockchip_reset_deassert(struct reset_ctl * reset_ctl)68 static int rockchip_reset_deassert(struct reset_ctl *reset_ctl)
69 {
70 struct rockchip_reset_priv *priv = dev_get_priv(reset_ctl->dev);
71 unsigned long id = reset_ctl->id;
72 int bank, offset;
73
74 if (priv->lut)
75 id = priv->lut[id];
76
77 bank = id / ROCKCHIP_RESET_NUM_IN_REG;
78 offset = id % ROCKCHIP_RESET_NUM_IN_REG;
79
80 debug("%s(reset_ctl=%p) (dev=%p, id=%lu) (reg_addr=%p)\n", __func__,
81 reset_ctl, reset_ctl->dev, id, priv->base + (bank * 4));
82
83 rk_clrreg(priv->base + (bank * 4), BIT(offset));
84
85 return 0;
86 }
87
88 struct reset_ops rockchip_reset_ops = {
89 .request = rockchip_reset_request,
90 .rst_assert = rockchip_reset_assert,
91 .rst_deassert = rockchip_reset_deassert,
92 };
93
rockchip_reset_probe(struct udevice * dev)94 static int rockchip_reset_probe(struct udevice *dev)
95 {
96 struct rockchip_reset_priv *priv = dev_get_priv(dev);
97 fdt_addr_t addr;
98 fdt_size_t size;
99
100 addr = dev_read_addr_size(dev, "reg", &size);
101 if (addr == FDT_ADDR_T_NONE)
102 return -EINVAL;
103
104 if ((priv->reset_reg_offset == 0) && (priv->reset_reg_num == 0))
105 return -EINVAL;
106
107 addr += priv->reset_reg_offset;
108 priv->base = ioremap(addr, size);
109
110 debug("%s(base=%p) (reg_offset=%x, reg_num=%d)\n", __func__,
111 priv->base, priv->reset_reg_offset, priv->reset_reg_num);
112
113 return 0;
114 }
115
rockchip_reset_bind_lut(struct udevice * pdev,const int * lookup_table,u32 reg_offset,u32 reg_number)116 int rockchip_reset_bind_lut(struct udevice *pdev,
117 const int *lookup_table,
118 u32 reg_offset,
119 u32 reg_number)
120 {
121 struct udevice *rst_dev;
122 struct rockchip_reset_priv *priv;
123 int ret;
124
125 ret = device_bind_driver_to_node(pdev, "rockchip_reset", "reset",
126 dev_ofnode(pdev), &rst_dev);
127 if (ret) {
128 debug("Warning: No rockchip reset driver: ret=%d\n", ret);
129 return ret;
130 }
131 priv = malloc(sizeof(struct rockchip_reset_priv));
132 priv->reset_reg_offset = reg_offset;
133 priv->reset_reg_num = reg_number;
134 priv->lut = lookup_table;
135 dev_set_priv(rst_dev, priv);
136
137 return 0;
138 }
139
rockchip_reset_bind(struct udevice * pdev,u32 reg_offset,u32 reg_number)140 int rockchip_reset_bind(struct udevice *pdev, u32 reg_offset, u32 reg_number)
141 {
142 return rockchip_reset_bind_lut(pdev, NULL, reg_offset, reg_number);
143 }
144
145 U_BOOT_DRIVER(rockchip_reset) = {
146 .name = "rockchip_reset",
147 .id = UCLASS_RESET,
148 .probe = rockchip_reset_probe,
149 .ops = &rockchip_reset_ops,
150 .priv_auto = sizeof(struct rockchip_reset_priv),
151 };
152