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gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / 7906ed4fdd70bb88ea8e6f47c404949a957f0890 / . / drivers / reset / reset-rockchip.c
blob: 01047a2f7134c2ba2269b609a4718990abbe5153 [file] [log] [blame]
Elaine Zhang760188c2017-12-19 18:22:37 +0800[diff] [blame]1/*
2 * (C) Copyright 2017 Rockchip Electronics Co., Ltd
3 *
4 * SPDX-License-Identifier: GPL-2.0
5 */
6
7#include <common.h>
8#include <dm.h>
9#include <reset-uclass.h>
10#include <linux/io.h>
11#include <asm/arch/hardware.h>
12#include <dm/lists.h>
13/*
14 * Each reg has 16 bits reset signal for devices
15 * Note: Not including rk2818 and older SoCs
16 */
17#define ROCKCHIP_RESET_NUM_IN_REG 16
18
19struct rockchip_reset_priv {
20 void __iomem *base;
21 /* Rockchip reset reg locate at cru controller */
22 u32 reset_reg_offset;
23 /* Rockchip reset reg number */
24 u32 reset_reg_num;
25};
26
27static int rockchip_reset_request(struct reset_ctl *reset_ctl)
28{
29 struct rockchip_reset_priv *priv = dev_get_priv(reset_ctl->dev);
30
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);
33
34 if (reset_ctl->id / ROCKCHIP_RESET_NUM_IN_REG >= priv->reset_reg_num)
35 return -EINVAL;
36
37 return 0;
38}
39
40static int rockchip_reset_free(struct reset_ctl *reset_ctl)
41{
42 debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, reset_ctl,
43 reset_ctl->dev, reset_ctl->id);
44
45 return 0;
46}
47
48static int rockchip_reset_assert(struct reset_ctl *reset_ctl)
49{
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;
53
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));
57
58 rk_setreg(priv->base + (bank * 4), BIT(offset));
59
60 return 0;
61}
62
63static int rockchip_reset_deassert(struct reset_ctl *reset_ctl)
64{
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;
68
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));
72
73 rk_clrreg(priv->base + (bank * 4), BIT(offset));
74
75 return 0;
76}
77
78struct reset_ops rockchip_reset_ops = {
79 .request = rockchip_reset_request,
80 .free = rockchip_reset_free,
81 .rst_assert = rockchip_reset_assert,
82 .rst_deassert = rockchip_reset_deassert,
83};
84
85static int rockchip_reset_probe(struct udevice *dev)
86{
87 struct rockchip_reset_priv *priv = dev_get_priv(dev);
88 fdt_addr_t addr;
89 fdt_size_t size;
90
91 addr = dev_read_addr_size(dev, "reg", &size);
92 if (addr == FDT_ADDR_T_NONE)
93 return -EINVAL;
94
95 if ((priv->reset_reg_offset == 0) && (priv->reset_reg_num == 0))
96 return -EINVAL;
97
98 addr += priv->reset_reg_offset;
99 priv->base = ioremap(addr, size);
100
101 debug("%s(base=%p) (reg_offset=%x, reg_num=%d)\n", __func__,
102 priv->base, priv->reset_reg_offset, priv->reset_reg_num);
103
104 return 0;
105}
106
107int rockchip_reset_bind(struct udevice *pdev, u32 reg_offset, u32 reg_number)
108{
109 struct udevice *rst_dev;
110 struct rockchip_reset_priv *priv;
111 int ret;
112
113 ret = device_bind_driver_to_node(pdev, "rockchip_reset", "reset",
114 dev_ofnode(pdev), &rst_dev);
115 if (ret) {
116 debug("Warning: No rockchip reset driver: ret=%d\n", ret);
117 return ret;
118 }
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;
123
124 return 0;
125}
126
127U_BOOT_DRIVER(rockchip_reset) = {
128 .name = "rockchip_reset",
129 .id = UCLASS_RESET,
130 .probe = rockchip_reset_probe,
131 .ops = &rockchip_reset_ops,
132 .priv_auto_alloc_size = sizeof(struct rockchip_reset_priv),
133};