tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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/init.h>
13#include <linux/of.h>
14
15#define SUN8I_CODEC_ANALOG_BASE 0x1c0
16#define SUN8I_CODEC_ANALOG_SIZE 0x4
17
18struct prcm_data {
19 int nsubdevs;
20 const struct mfd_cell *subdevs;
21};
22
23static const struct resource sun6i_a31_ar100_clk_res[] = {
24 {
25 .start = 0x0,
26 .end = 0x3,
27 .flags = IORESOURCE_MEM,
28 },
29};
30
31static const struct resource sun6i_a31_apb0_clk_res[] = {
32 {
33 .start = 0xc,
34 .end = 0xf,
35 .flags = IORESOURCE_MEM,
36 },
37};
38
39static const struct resource sun6i_a31_apb0_gates_clk_res[] = {
40 {
41 .start = 0x28,
42 .end = 0x2b,
43 .flags = IORESOURCE_MEM,
44 },
45};
46
47static const struct resource sun6i_a31_ir_clk_res[] = {
48 {
49 .start = 0x54,
50 .end = 0x57,
51 .flags = IORESOURCE_MEM,
52 },
53};
54
55static const struct resource sun6i_a31_apb0_rstc_res[] = {
56 {
57 .start = 0xb0,
58 .end = 0xb3,
59 .flags = IORESOURCE_MEM,
60 },
61};
62
63static const struct resource sun8i_codec_analog_res[] = {
64 DEFINE_RES_MEM(SUN8I_CODEC_ANALOG_BASE, SUN8I_CODEC_ANALOG_SIZE),
65};
66
67static const struct mfd_cell sun6i_a31_prcm_subdevs[] = {
68 {
69 .name = "sun6i-a31-ar100-clk",
70 .of_compatible = "allwinner,sun6i-a31-ar100-clk",
71 .num_resources = ARRAY_SIZE(sun6i_a31_ar100_clk_res),
72 .resources = sun6i_a31_ar100_clk_res,
73 },
74 {
75 .name = "sun6i-a31-apb0-clk",
76 .of_compatible = "allwinner,sun6i-a31-apb0-clk",
77 .num_resources = ARRAY_SIZE(sun6i_a31_apb0_clk_res),
78 .resources = sun6i_a31_apb0_clk_res,
79 },
80 {
81 .name = "sun6i-a31-apb0-gates-clk",
82 .of_compatible = "allwinner,sun6i-a31-apb0-gates-clk",
83 .num_resources = ARRAY_SIZE(sun6i_a31_apb0_gates_clk_res),
84 .resources = sun6i_a31_apb0_gates_clk_res,
85 },
86 {
87 .name = "sun6i-a31-ir-clk",
88 .of_compatible = "allwinner,sun4i-a10-mod0-clk",
89 .num_resources = ARRAY_SIZE(sun6i_a31_ir_clk_res),
90 .resources = sun6i_a31_ir_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
100static const struct mfd_cell sun8i_a23_prcm_subdevs[] = {
101 {
102 .name = "sun8i-a23-apb0-clk",
103 .of_compatible = "allwinner,sun8i-a23-apb0-clk",
104 .num_resources = ARRAY_SIZE(sun6i_a31_apb0_clk_res),
105 .resources = sun6i_a31_apb0_clk_res,
106 },
107 {
108 .name = "sun6i-a31-apb0-gates-clk",
109 .of_compatible = "allwinner,sun8i-a23-apb0-gates-clk",
110 .num_resources = ARRAY_SIZE(sun6i_a31_apb0_gates_clk_res),
111 .resources = sun6i_a31_apb0_gates_clk_res,
112 },
113 {
114 .name = "sun6i-a31-apb0-clock-reset",
115 .of_compatible = "allwinner,sun6i-a31-clock-reset",
116 .num_resources = ARRAY_SIZE(sun6i_a31_apb0_rstc_res),
117 .resources = sun6i_a31_apb0_rstc_res,
118 },
119 {
120 .name = "sun8i-codec-analog",
121 .of_compatible = "allwinner,sun8i-a23-codec-analog",
122 .num_resources = ARRAY_SIZE(sun8i_codec_analog_res),
123 .resources = sun8i_codec_analog_res,
124 },
125};
126
127static const struct prcm_data sun6i_a31_prcm_data = {
128 .nsubdevs = ARRAY_SIZE(sun6i_a31_prcm_subdevs),
129 .subdevs = sun6i_a31_prcm_subdevs,
130};
131
132static const struct prcm_data sun8i_a23_prcm_data = {
133 .nsubdevs = ARRAY_SIZE(sun8i_a23_prcm_subdevs),
134 .subdevs = sun8i_a23_prcm_subdevs,
135};
136
137static const struct of_device_id sun6i_prcm_dt_ids[] = {
138 {
139 .compatible = "allwinner,sun6i-a31-prcm",
140 .data = &sun6i_a31_prcm_data,
141 },
142 {
143 .compatible = "allwinner,sun8i-a23-prcm",
144 .data = &sun8i_a23_prcm_data,
145 },
146 { /* sentinel */ },
147};
148
149static int sun6i_prcm_probe(struct platform_device *pdev)
150{
151 struct device_node *np = pdev->dev.of_node;
152 const struct of_device_id *match;
153 const struct prcm_data *data;
154 struct resource *res;
155 int ret;
156
157 match = of_match_node(sun6i_prcm_dt_ids, np);
158 if (!match)
159 return -EINVAL;
160
161 data = match->data;
162
163 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
164 if (!res) {
165 dev_err(&pdev->dev, "no prcm memory region provided\n");
166 return -ENOENT;
167 }
168
169 ret = mfd_add_devices(&pdev->dev, 0, data->subdevs, data->nsubdevs,
170 res, -1, NULL);
171 if (ret) {
172 dev_err(&pdev->dev, "failed to add subdevices\n");
173 return ret;
174 }
175
176 return 0;
177}
178
179static struct platform_driver sun6i_prcm_driver = {
180 .driver = {
181 .name = "sun6i-prcm",
182 .of_match_table = sun6i_prcm_dt_ids,
183 },
184 .probe = sun6i_prcm_probe,
185};
186builtin_platform_driver(sun6i_prcm_driver);