1/*
2 * Copyright (C) 2014 Free Electrons
3 *
4 * License Terms: GNU General Public License v2
5 * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
6 *
7 * Allwinner PRCM (Power/Reset/Clock Management) driver
8 *
9 */
10
11#include <linux/mfd/core.h>
12#include <linux/module.h>
13#include <linux/of.h>
14
15struct prcm_data {
16	int nsubdevs;
17	const struct mfd_cell *subdevs;
18};
19
20static const struct resource sun6i_a31_ar100_clk_res[] = {
21	{
22		.start = 0x0,
23		.end = 0x3,
24		.flags = IORESOURCE_MEM,
25	},
26};
27
28static const struct resource sun6i_a31_apb0_clk_res[] = {
29	{
30		.start = 0xc,
31		.end = 0xf,
32		.flags = IORESOURCE_MEM,
33	},
34};
35
36static const struct resource sun6i_a31_apb0_gates_clk_res[] = {
37	{
38		.start = 0x28,
39		.end = 0x2b,
40		.flags = IORESOURCE_MEM,
41	},
42};
43
44static const struct resource sun6i_a31_ir_clk_res[] = {
45	{
46		.start = 0x54,
47		.end = 0x57,
48		.flags = IORESOURCE_MEM,
49	},
50};
51
52static const struct resource sun6i_a31_apb0_rstc_res[] = {
53	{
54		.start = 0xb0,
55		.end = 0xb3,
56		.flags = IORESOURCE_MEM,
57	},
58};
59
60static const struct mfd_cell sun6i_a31_prcm_subdevs[] = {
61	{
62		.name = "sun6i-a31-ar100-clk",
63		.of_compatible = "allwinner,sun6i-a31-ar100-clk",
64		.num_resources = ARRAY_SIZE(sun6i_a31_ar100_clk_res),
65		.resources = sun6i_a31_ar100_clk_res,
66	},
67	{
68		.name = "sun6i-a31-apb0-clk",
69		.of_compatible = "allwinner,sun6i-a31-apb0-clk",
70		.num_resources = ARRAY_SIZE(sun6i_a31_apb0_clk_res),
71		.resources = sun6i_a31_apb0_clk_res,
72	},
73	{
74		.name = "sun6i-a31-apb0-gates-clk",
75		.of_compatible = "allwinner,sun6i-a31-apb0-gates-clk",
76		.num_resources = ARRAY_SIZE(sun6i_a31_apb0_gates_clk_res),
77		.resources = sun6i_a31_apb0_gates_clk_res,
78	},
79	{
80		.name = "sun6i-a31-ir-clk",
81		.of_compatible = "allwinner,sun4i-a10-mod0-clk",
82		.num_resources = ARRAY_SIZE(sun6i_a31_ir_clk_res),
83		.resources = sun6i_a31_ir_clk_res,
84	},
85	{
86		.name = "sun6i-a31-apb0-clock-reset",
87		.of_compatible = "allwinner,sun6i-a31-clock-reset",
88		.num_resources = ARRAY_SIZE(sun6i_a31_apb0_rstc_res),
89		.resources = sun6i_a31_apb0_rstc_res,
90	},
91};
92
93static const struct mfd_cell sun8i_a23_prcm_subdevs[] = {
94	{
95		.name = "sun8i-a23-apb0-clk",
96		.of_compatible = "allwinner,sun8i-a23-apb0-clk",
97		.num_resources = ARRAY_SIZE(sun6i_a31_apb0_clk_res),
98		.resources = sun6i_a31_apb0_clk_res,
99	},
100	{
101		.name = "sun6i-a31-apb0-gates-clk",
102		.of_compatible = "allwinner,sun8i-a23-apb0-gates-clk",
103		.num_resources = ARRAY_SIZE(sun6i_a31_apb0_gates_clk_res),
104		.resources = sun6i_a31_apb0_gates_clk_res,
105	},
106	{
107		.name = "sun6i-a31-apb0-clock-reset",
108		.of_compatible = "allwinner,sun6i-a31-clock-reset",
109		.num_resources = ARRAY_SIZE(sun6i_a31_apb0_rstc_res),
110		.resources = sun6i_a31_apb0_rstc_res,
111	},
112};
113
114static const struct prcm_data sun6i_a31_prcm_data = {
115	.nsubdevs = ARRAY_SIZE(sun6i_a31_prcm_subdevs),
116	.subdevs = sun6i_a31_prcm_subdevs,
117};
118
119static const struct prcm_data sun8i_a23_prcm_data = {
120	.nsubdevs = ARRAY_SIZE(sun8i_a23_prcm_subdevs),
121	.subdevs = sun8i_a23_prcm_subdevs,
122};
123
124static const struct of_device_id sun6i_prcm_dt_ids[] = {
125	{
126		.compatible = "allwinner,sun6i-a31-prcm",
127		.data = &sun6i_a31_prcm_data,
128	},
129	{
130		.compatible = "allwinner,sun8i-a23-prcm",
131		.data = &sun8i_a23_prcm_data,
132	},
133	{ /* sentinel */ },
134};
135
136static int sun6i_prcm_probe(struct platform_device *pdev)
137{
138	struct device_node *np = pdev->dev.of_node;
139	const struct of_device_id *match;
140	const struct prcm_data *data;
141	struct resource *res;
142	int ret;
143
144	match = of_match_node(sun6i_prcm_dt_ids, np);
145	if (!match)
146		return -EINVAL;
147
148	data = match->data;
149
150	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
151	if (!res) {
152		dev_err(&pdev->dev, "no prcm memory region provided\n");
153		return -ENOENT;
154	}
155
156	ret = mfd_add_devices(&pdev->dev, 0, data->subdevs, data->nsubdevs,
157			      res, -1, NULL);
158	if (ret) {
159		dev_err(&pdev->dev, "failed to add subdevices\n");
160		return ret;
161	}
162
163	return 0;
164}
165
166static struct platform_driver sun6i_prcm_driver = {
167	.driver = {
168		.name = "sun6i-prcm",
169		.of_match_table = sun6i_prcm_dt_ids,
170	},
171	.probe = sun6i_prcm_probe,
172};
173module_platform_driver(sun6i_prcm_driver);
174
175MODULE_AUTHOR("Boris BREZILLON <boris.brezillon@free-electrons.com>");
176MODULE_DESCRIPTION("Allwinner sun6i PRCM driver");
177MODULE_LICENSE("GPL v2");
178