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Boris BREZILLONd58603c2014-05-09 13:11:47 +02001/*
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_apb0_rstc_res[] = {
45 {
46 .start = 0xb0,
47 .end = 0xb3,
48 .flags = IORESOURCE_MEM,
49 },
50};
51
52static const struct mfd_cell sun6i_a31_prcm_subdevs[] = {
53 {
54 .name = "sun6i-a31-ar100-clk",
55 .of_compatible = "allwinner,sun6i-a31-ar100-clk",
56 .num_resources = ARRAY_SIZE(sun6i_a31_ar100_clk_res),
57 .resources = sun6i_a31_ar100_clk_res,
58 },
59 {
60 .name = "sun6i-a31-apb0-clk",
61 .of_compatible = "allwinner,sun6i-a31-apb0-clk",
62 .num_resources = ARRAY_SIZE(sun6i_a31_apb0_clk_res),
63 .resources = sun6i_a31_apb0_clk_res,
64 },
65 {
66 .name = "sun6i-a31-apb0-gates-clk",
67 .of_compatible = "allwinner,sun6i-a31-apb0-gates-clk",
68 .num_resources = ARRAY_SIZE(sun6i_a31_apb0_gates_clk_res),
69 .resources = sun6i_a31_apb0_gates_clk_res,
70 },
71 {
72 .name = "sun6i-a31-apb0-clock-reset",
73 .of_compatible = "allwinner,sun6i-a31-clock-reset",
74 .num_resources = ARRAY_SIZE(sun6i_a31_apb0_rstc_res),
75 .resources = sun6i_a31_apb0_rstc_res,
76 },
77};
78
Chen-Yu Tsai4eb95602014-07-09 15:54:36 +080079static const struct mfd_cell sun8i_a23_prcm_subdevs[] = {
80 {
81 .name = "sun8i-a23-apb0-clk",
82 .of_compatible = "allwinner,sun8i-a23-apb0-clk",
83 .num_resources = ARRAY_SIZE(sun6i_a31_apb0_clk_res),
84 .resources = sun6i_a31_apb0_clk_res,
85 },
86 {
87 .name = "sun6i-a31-apb0-gates-clk",
88 .of_compatible = "allwinner,sun8i-a23-apb0-gates-clk",
89 .num_resources = ARRAY_SIZE(sun6i_a31_apb0_gates_clk_res),
90 .resources = sun6i_a31_apb0_gates_clk_res,
91 },
92 {
93 .name = "sun6i-a31-apb0-clock-reset",
94 .of_compatible = "allwinner,sun6i-a31-clock-reset",
95 .num_resources = ARRAY_SIZE(sun6i_a31_apb0_rstc_res),
96 .resources = sun6i_a31_apb0_rstc_res,
97 },
98};
99
Boris BREZILLONd58603c2014-05-09 13:11:47 +0200100static const struct prcm_data sun6i_a31_prcm_data = {
101 .nsubdevs = ARRAY_SIZE(sun6i_a31_prcm_subdevs),
102 .subdevs = sun6i_a31_prcm_subdevs,
103};
104
Chen-Yu Tsai4eb95602014-07-09 15:54:36 +0800105static const struct prcm_data sun8i_a23_prcm_data = {
106 .nsubdevs = ARRAY_SIZE(sun8i_a23_prcm_subdevs),
107 .subdevs = sun8i_a23_prcm_subdevs,
108};
109
Boris BREZILLONd58603c2014-05-09 13:11:47 +0200110static const struct of_device_id sun6i_prcm_dt_ids[] = {
111 {
112 .compatible = "allwinner,sun6i-a31-prcm",
113 .data = &sun6i_a31_prcm_data,
114 },
Chen-Yu Tsai4eb95602014-07-09 15:54:36 +0800115 {
116 .compatible = "allwinner,sun8i-a23-prcm",
117 .data = &sun8i_a23_prcm_data,
118 },
Boris BREZILLONd58603c2014-05-09 13:11:47 +0200119 { /* sentinel */ },
120};
121
122static int sun6i_prcm_probe(struct platform_device *pdev)
123{
124 struct device_node *np = pdev->dev.of_node;
125 const struct of_device_id *match;
126 const struct prcm_data *data;
127 struct resource *res;
128 int ret;
129
130 match = of_match_node(sun6i_prcm_dt_ids, np);
131 if (!match)
132 return -EINVAL;
133
134 data = match->data;
135
136 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
137 if (!res) {
138 dev_err(&pdev->dev, "no prcm memory region provided\n");
139 return -ENOENT;
140 }
141
142 ret = mfd_add_devices(&pdev->dev, 0, data->subdevs, data->nsubdevs,
143 res, -1, NULL);
144 if (ret) {
145 dev_err(&pdev->dev, "failed to add subdevices\n");
146 return ret;
147 }
148
149 return 0;
150}
151
152static struct platform_driver sun6i_prcm_driver = {
153 .driver = {
154 .name = "sun6i-prcm",
155 .owner = THIS_MODULE,
156 .of_match_table = sun6i_prcm_dt_ids,
157 },
158 .probe = sun6i_prcm_probe,
159};
160module_platform_driver(sun6i_prcm_driver);
161
162MODULE_AUTHOR("Boris BREZILLON <boris.brezillon@free-electrons.com>");
163MODULE_DESCRIPTION("Allwinner sun6i PRCM driver");
164MODULE_LICENSE("GPL v2");