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 <reset-uclass.h>
9 #include <linux/io.h>
10 #include <asm/arch/hardware.h>
11 #include <dm/lists.h>
12 /*
13  * Each reg has 16 bits reset signal for devices
14  * Note: Not including rk2818 and older SoCs
15  */
16 #define ROCKCHIP_RESET_NUM_IN_REG	16
17 
18 struct rockchip_reset_priv {
19 	void __iomem *base;
20 	/* Rockchip reset reg locate at cru controller */
21 	u32 reset_reg_offset;
22 	/* Rockchip reset reg number */
23 	u32 reset_reg_num;
24 };
25 
rockchip_reset_request(struct reset_ctl * reset_ctl)26 static int rockchip_reset_request(struct reset_ctl *reset_ctl)
27 {
28 	struct rockchip_reset_priv *priv = dev_get_priv(reset_ctl->dev);
29 
30 	debug("%s(reset_ctl=%p) (dev=%p, id=%lu) (reg_num=%d)\n", __func__,
31 	      reset_ctl, reset_ctl->dev, reset_ctl->id, priv->reset_reg_num);
32 
33 	if (reset_ctl->id / ROCKCHIP_RESET_NUM_IN_REG >= priv->reset_reg_num)
34 		return -EINVAL;
35 
36 	return 0;
37 }
38 
rockchip_reset_free(struct reset_ctl * reset_ctl)39 static int rockchip_reset_free(struct reset_ctl *reset_ctl)
40 {
41 	debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, reset_ctl,
42 	      reset_ctl->dev, reset_ctl->id);
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 	int bank =  reset_ctl->id / ROCKCHIP_RESET_NUM_IN_REG;
51 	int offset =  reset_ctl->id % ROCKCHIP_RESET_NUM_IN_REG;
52 
53 	debug("%s(reset_ctl=%p) (dev=%p, id=%lu) (reg_addr=%p)\n", __func__,
54 	      reset_ctl, reset_ctl->dev, reset_ctl->id,
55 	      priv->base + (bank * 4));
56 
57 	rk_setreg(priv->base + (bank * 4), BIT(offset));
58 
59 	return 0;
60 }
61 
rockchip_reset_deassert(struct reset_ctl * reset_ctl)62 static int rockchip_reset_deassert(struct reset_ctl *reset_ctl)
63 {
64 	struct rockchip_reset_priv *priv = dev_get_priv(reset_ctl->dev);
65 	int bank =  reset_ctl->id / ROCKCHIP_RESET_NUM_IN_REG;
66 	int offset =  reset_ctl->id % ROCKCHIP_RESET_NUM_IN_REG;
67 
68 	debug("%s(reset_ctl=%p) (dev=%p, id=%lu) (reg_addr=%p)\n", __func__,
69 	      reset_ctl, reset_ctl->dev, reset_ctl->id,
70 	      priv->base + (bank * 4));
71 
72 	rk_clrreg(priv->base + (bank * 4), BIT(offset));
73 
74 	return 0;
75 }
76 
77 struct reset_ops rockchip_reset_ops = {
78 	.request = rockchip_reset_request,
79 	.free = rockchip_reset_free,
80 	.rst_assert = rockchip_reset_assert,
81 	.rst_deassert = rockchip_reset_deassert,
82 };
83 
rockchip_reset_probe(struct udevice * dev)84 static int rockchip_reset_probe(struct udevice *dev)
85 {
86 	struct rockchip_reset_priv *priv = dev_get_priv(dev);
87 	fdt_addr_t addr;
88 	fdt_size_t size;
89 
90 	addr = dev_read_addr_size(dev, "reg", &size);
91 	if (addr == FDT_ADDR_T_NONE)
92 		return -EINVAL;
93 
94 	if ((priv->reset_reg_offset == 0) && (priv->reset_reg_num == 0))
95 		return -EINVAL;
96 
97 	addr += priv->reset_reg_offset;
98 	priv->base = ioremap(addr, size);
99 
100 	debug("%s(base=%p) (reg_offset=%x, reg_num=%d)\n", __func__,
101 	      priv->base, priv->reset_reg_offset, priv->reset_reg_num);
102 
103 	return 0;
104 }
105 
rockchip_reset_bind(struct udevice * pdev,u32 reg_offset,u32 reg_number)106 int rockchip_reset_bind(struct udevice *pdev, u32 reg_offset, u32 reg_number)
107 {
108 	struct udevice *rst_dev;
109 	struct rockchip_reset_priv *priv;
110 	int ret;
111 
112 	 ret = device_bind_driver_to_node(pdev, "rockchip_reset", "reset",
113 					  dev_ofnode(pdev), &rst_dev);
114 	if (ret) {
115 		debug("Warning: No rockchip reset driver: ret=%d\n", ret);
116 		return ret;
117 	}
118 	priv = malloc(sizeof(struct rockchip_reset_priv));
119 	priv->reset_reg_offset = reg_offset;
120 	priv->reset_reg_num = reg_number;
121 	rst_dev->priv = priv;
122 
123 	return 0;
124 }
125 
126 U_BOOT_DRIVER(rockchip_reset) = {
127 	.name = "rockchip_reset",
128 	.id = UCLASS_RESET,
129 	.probe = rockchip_reset_probe,
130 	.ops = &rockchip_reset_ops,
131 	.priv_auto_alloc_size = sizeof(struct rockchip_reset_priv),
132 };
133