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
12 struct rockchip_reset_priv {
13 void __iomem *base;
14 unsigned int sf_reset_offset;
15 unsigned int sf_reset_num;
16 };
17
rockchip_reset_request(struct reset_ctl * reset_ctl)18 static int rockchip_reset_request(struct reset_ctl *reset_ctl)
19 {
20 struct rockchip_reset_priv *priv = dev_get_priv(reset_ctl->dev);
21
22 debug("%s(reset_ctl=%p) (dev=%p, id=%lu) (sf_reset_num=%d)\n", __func__,
23 reset_ctl, reset_ctl->dev, reset_ctl->id, priv->sf_reset_num);
24
25 if (reset_ctl->id / 16 >= priv->sf_reset_num)
26 return -EINVAL;
27
28 return 0;
29 }
30
rockchip_reset_free(struct reset_ctl * reset_ctl)31 static int rockchip_reset_free(struct reset_ctl *reset_ctl)
32 {
33 debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, reset_ctl,
34 reset_ctl->dev, reset_ctl->id);
35
36 return 0;
37 }
38
rockchip_reset_assert(struct reset_ctl * reset_ctl)39 static int rockchip_reset_assert(struct reset_ctl *reset_ctl)
40 {
41 struct rockchip_reset_priv *priv = dev_get_priv(reset_ctl->dev);
42 int bank = reset_ctl->id / 16;
43 int offset = reset_ctl->id % 16;
44
45 debug("%s(reset_ctl=%p) (dev=%p, id=%lu) (reg_addr=%p)\n", __func__,
46 reset_ctl, reset_ctl->dev, reset_ctl->id,
47 priv->base + (bank * 4));
48
49 writel(BIT(offset) | (BIT(offset) << 16), priv->base + (bank * 4));
50
51 return 0;
52 }
53
rockchip_reset_deassert(struct reset_ctl * reset_ctl)54 static int rockchip_reset_deassert(struct reset_ctl *reset_ctl)
55 {
56 struct rockchip_reset_priv *priv = dev_get_priv(reset_ctl->dev);
57 int bank = reset_ctl->id / 16;
58 int offset = reset_ctl->id % 16;
59
60 debug("%s(reset_ctl=%p) (dev=%p, id=%lu) (reg_addr=%p)\n", __func__,
61 reset_ctl, reset_ctl->dev, reset_ctl->id,
62 priv->base + (bank * 4));
63
64 writel((BIT(offset) << 16), priv->base + (bank * 4));
65
66 return 0;
67 }
68
69 struct reset_ops rockchip_reset_ops = {
70 .request = rockchip_reset_request,
71 .free = rockchip_reset_free,
72 .rst_assert = rockchip_reset_assert,
73 .rst_deassert = rockchip_reset_deassert,
74 };
75
rockchip_reset_probe(struct udevice * dev)76 static int rockchip_reset_probe(struct udevice *dev)
77 {
78 struct rockchip_reset_priv *priv = dev_get_priv(dev);
79 fdt_addr_t addr;
80 fdt_size_t size;
81
82 addr = dev_read_addr_size(dev, "reg", &size);
83 if (addr == FDT_ADDR_T_NONE)
84 return -EINVAL;
85
86 if ((priv->sf_reset_offset == 0) && (priv->sf_reset_num == 0))
87 return -EINVAL;
88
89 addr += priv->sf_reset_offset;
90 priv->base = ioremap(addr, size);
91
92 debug("%s(base=%p) (sf_reset_offset=%x, sf_reset_num=%d)\n", __func__,
93 priv->base, priv->sf_reset_offset, priv->sf_reset_num);
94
95 return 0;
96 }
97
98 U_BOOT_DRIVER(rockchip_reset) = {
99 .name = "rockchip_reset",
100 .id = UCLASS_RESET,
101 .probe = rockchip_reset_probe,
102 .ops = &rockchip_reset_ops,
103 .priv_auto_alloc_size = sizeof(struct rockchip_reset_priv),
104 };
105