blob: 774c2a7538d47da58cd7171b2ccd0f0291fad80d [file] [log] [blame]
Álvaro Fernández Rojas18393f72017-05-03 15:10:21 +02001/*
2 * Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
3 *
4 * Derived from linux/arch/mips/bcm63xx/reset.c:
5 * Copyright (C) 2012 Jonas Gorski <jonas.gorski@gmail.com>
6 *
7 * SPDX-License-Identifier: GPL-2.0+
8 */
9
10#include <common.h>
11#include <dm.h>
12#include <errno.h>
13#include <reset-uclass.h>
14#include <asm/io.h>
15
16#define MAX_RESETS 32
17
18struct bcm6345_reset_priv {
19 void __iomem *regs;
20};
21
22static int bcm6345_reset_assert(struct reset_ctl *rst)
23{
24 struct bcm6345_reset_priv *priv = dev_get_priv(rst->dev);
25
26 clrbits_be32(priv->regs, BIT(rst->id));
27 mdelay(20);
28
29 return 0;
30}
31
32static int bcm6345_reset_deassert(struct reset_ctl *rst)
33{
34 struct bcm6345_reset_priv *priv = dev_get_priv(rst->dev);
35
36 setbits_be32(priv->regs, BIT(rst->id));
37 mdelay(20);
38
39 return 0;
40}
41
42static int bcm6345_reset_free(struct reset_ctl *rst)
43{
44 return 0;
45}
46
47static int bcm6345_reset_request(struct reset_ctl *rst)
48{
49 if (rst->id >= MAX_RESETS)
50 return -EINVAL;
51
52 return bcm6345_reset_assert(rst);
53}
54
55struct reset_ops bcm6345_reset_reset_ops = {
56 .free = bcm6345_reset_free,
57 .request = bcm6345_reset_request,
58 .rst_assert = bcm6345_reset_assert,
59 .rst_deassert = bcm6345_reset_deassert,
60};
61
62static const struct udevice_id bcm6345_reset_ids[] = {
63 { .compatible = "brcm,bcm6345-reset" },
64 { /* sentinel */ }
65};
66
67static int bcm6345_reset_probe(struct udevice *dev)
68{
69 struct bcm6345_reset_priv *priv = dev_get_priv(dev);
70 fdt_addr_t addr;
71 fdt_size_t size;
72
73 addr = dev_get_addr_size_index(dev, 0, &size);
74 if (addr == FDT_ADDR_T_NONE)
75 return -EINVAL;
76
77 priv->regs = ioremap(addr, size);
78
79 return 0;
80}
81
82U_BOOT_DRIVER(bcm6345_reset) = {
83 .name = "bcm6345-reset",
84 .id = UCLASS_RESET,
85 .of_match = bcm6345_reset_ids,
86 .ops = &bcm6345_reset_reset_ops,
87 .probe = bcm6345_reset_probe,
88 .priv_auto_alloc_size = sizeof(struct bcm6345_reset_priv),
89};