1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * (C) Copyright 2017 Rockchip Electronics Co., Ltd
4 */
5
6 #include <dm.h>
7 #include <log.h>
8 #include <malloc.h>
9 #include <reset-uclass.h>
10 #include <linux/bitops.h>
11 #include <linux/io.h>
12 #include <asm/arch-rockchip/hardware.h>
13 #include <dm/device-internal.h>
14 #include <dm/lists.h>
15 /*
16 * Each reg has 16 bits reset signal for devices
17 * Note: Not including rk2818 and older SoCs
18 */
19 #define ROCKCHIP_RESET_NUM_IN_REG 16
20
21 struct rockchip_reset_priv {
22 void __iomem *base;
23 const int *lut;
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 unsigned long id = reset_ctl->id;
34
35 if (priv->lut)
36 id = priv->lut[id];
37
38 debug("%s(reset_ctl=%p) (dev=%p, id=%lu) (reg_num=%d)\n", __func__,
39 reset_ctl, reset_ctl->dev, id, priv->reset_reg_num);
40
41 if (id / ROCKCHIP_RESET_NUM_IN_REG >= priv->reset_reg_num)
42 return -EINVAL;
43
44 return 0;
45 }
46
rockchip_reset_assert(struct reset_ctl * reset_ctl)47 static int rockchip_reset_assert(struct reset_ctl *reset_ctl)
48 {
49 struct rockchip_reset_priv *priv = dev_get_priv(reset_ctl->dev);
50 unsigned long id = reset_ctl->id;
51 int bank, offset;
52
53 if (priv->lut)
54 id = priv->lut[id];
55
56 bank = id / ROCKCHIP_RESET_NUM_IN_REG;
57 offset = id % ROCKCHIP_RESET_NUM_IN_REG;
58
59 debug("%s(reset_ctl=%p) (dev=%p, id=%lu) (reg_addr=%p)\n", __func__,
60 reset_ctl, reset_ctl->dev, id, priv->base + (bank * 4));
61
62 rk_setreg(priv->base + (bank * 4), BIT(offset));
63
64 return 0;
65 }
66
rockchip_reset_deassert(struct reset_ctl * reset_ctl)67 static int rockchip_reset_deassert(struct reset_ctl *reset_ctl)
68 {
69 struct rockchip_reset_priv *priv = dev_get_priv(reset_ctl->dev);
70 unsigned long id = reset_ctl->id;
71 int bank, offset;
72
73 if (priv->lut)
74 id = priv->lut[id];
75
76 bank = id / ROCKCHIP_RESET_NUM_IN_REG;
77 offset = id % ROCKCHIP_RESET_NUM_IN_REG;
78
79 debug("%s(reset_ctl=%p) (dev=%p, id=%lu) (reg_addr=%p)\n", __func__,
80 reset_ctl, reset_ctl->dev, id, priv->base + (bank * 4));
81
82 rk_clrreg(priv->base + (bank * 4), BIT(offset));
83
84 return 0;
85 }
86
87 struct reset_ops rockchip_reset_ops = {
88 .request = rockchip_reset_request,
89 .rst_assert = rockchip_reset_assert,
90 .rst_deassert = rockchip_reset_deassert,
91 };
92
rockchip_reset_probe(struct udevice * dev)93 static int rockchip_reset_probe(struct udevice *dev)
94 {
95 struct rockchip_reset_priv *priv = dev_get_priv(dev);
96 fdt_addr_t addr;
97 fdt_size_t size;
98
99 addr = dev_read_addr_size(dev, &size);
100 if (addr == FDT_ADDR_T_NONE)
101 return -EINVAL;
102
103 if ((priv->reset_reg_offset == 0) && (priv->reset_reg_num == 0))
104 return -EINVAL;
105
106 addr += priv->reset_reg_offset;
107 priv->base = ioremap(addr, size);
108
109 debug("%s(base=%p) (reg_offset=%x, reg_num=%d)\n", __func__,
110 priv->base, priv->reset_reg_offset, priv->reset_reg_num);
111
112 return 0;
113 }
114
rockchip_reset_bind_lut(struct udevice * pdev,const int * lookup_table,u32 reg_offset,u32 reg_number)115 int rockchip_reset_bind_lut(struct udevice *pdev,
116 const int *lookup_table,
117 u32 reg_offset,
118 u32 reg_number)
119 {
120 struct udevice *rst_dev;
121 struct rockchip_reset_priv *priv;
122 int ret;
123
124 ret = device_bind_driver_to_node(pdev, "rockchip_reset", "reset",
125 dev_ofnode(pdev), &rst_dev);
126 if (ret) {
127 debug("Warning: No rockchip reset driver: ret=%d\n", ret);
128 return ret;
129 }
130 priv = malloc(sizeof(struct rockchip_reset_priv));
131 priv->reset_reg_offset = reg_offset;
132 priv->reset_reg_num = reg_number;
133 priv->lut = lookup_table;
134 dev_set_priv(rst_dev, priv);
135
136 return 0;
137 }
138
rockchip_reset_bind(struct udevice * pdev,u32 reg_offset,u32 reg_number)139 int rockchip_reset_bind(struct udevice *pdev, u32 reg_offset, u32 reg_number)
140 {
141 return rockchip_reset_bind_lut(pdev, NULL, reg_offset, reg_number);
142 }
143
144 U_BOOT_DRIVER(rockchip_reset) = {
145 .name = "rockchip_reset",
146 .id = UCLASS_RESET,
147 .probe = rockchip_reset_probe,
148 .ops = &rockchip_reset_ops,
149 .priv_auto = sizeof(struct rockchip_reset_priv),
150 };
151