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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 | ||
15 | struct prcm_data { | |
16 | int nsubdevs; | |
17 | const struct mfd_cell *subdevs; | |
18 | }; | |
19 | ||
20 | static const struct resource sun6i_a31_ar100_clk_res[] = { | |
21 | { | |
22 | .start = 0x0, | |
23 | .end = 0x3, | |
24 | .flags = IORESOURCE_MEM, | |
25 | }, | |
26 | }; | |
27 | ||
28 | static const struct resource sun6i_a31_apb0_clk_res[] = { | |
29 | { | |
30 | .start = 0xc, | |
31 | .end = 0xf, | |
32 | .flags = IORESOURCE_MEM, | |
33 | }, | |
34 | }; | |
35 | ||
36 | static const struct resource sun6i_a31_apb0_gates_clk_res[] = { | |
37 | { | |
38 | .start = 0x28, | |
39 | .end = 0x2b, | |
40 | .flags = IORESOURCE_MEM, | |
41 | }, | |
42 | }; | |
43 | ||
44 | static const struct resource sun6i_a31_apb0_rstc_res[] = { | |
45 | { | |
46 | .start = 0xb0, | |
47 | .end = 0xb3, | |
48 | .flags = IORESOURCE_MEM, | |
49 | }, | |
50 | }; | |
51 | ||
52 | static 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 | ||
79 | static const struct prcm_data sun6i_a31_prcm_data = { | |
80 | .nsubdevs = ARRAY_SIZE(sun6i_a31_prcm_subdevs), | |
81 | .subdevs = sun6i_a31_prcm_subdevs, | |
82 | }; | |
83 | ||
84 | static const struct of_device_id sun6i_prcm_dt_ids[] = { | |
85 | { | |
86 | .compatible = "allwinner,sun6i-a31-prcm", | |
87 | .data = &sun6i_a31_prcm_data, | |
88 | }, | |
89 | { /* sentinel */ }, | |
90 | }; | |
91 | ||
92 | static int sun6i_prcm_probe(struct platform_device *pdev) | |
93 | { | |
94 | struct device_node *np = pdev->dev.of_node; | |
95 | const struct of_device_id *match; | |
96 | const struct prcm_data *data; | |
97 | struct resource *res; | |
98 | int ret; | |
99 | ||
100 | match = of_match_node(sun6i_prcm_dt_ids, np); | |
101 | if (!match) | |
102 | return -EINVAL; | |
103 | ||
104 | data = match->data; | |
105 | ||
106 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
107 | if (!res) { | |
108 | dev_err(&pdev->dev, "no prcm memory region provided\n"); | |
109 | return -ENOENT; | |
110 | } | |
111 | ||
112 | ret = mfd_add_devices(&pdev->dev, 0, data->subdevs, data->nsubdevs, | |
113 | res, -1, NULL); | |
114 | if (ret) { | |
115 | dev_err(&pdev->dev, "failed to add subdevices\n"); | |
116 | return ret; | |
117 | } | |
118 | ||
119 | return 0; | |
120 | } | |
121 | ||
122 | static struct platform_driver sun6i_prcm_driver = { | |
123 | .driver = { | |
124 | .name = "sun6i-prcm", | |
125 | .owner = THIS_MODULE, | |
126 | .of_match_table = sun6i_prcm_dt_ids, | |
127 | }, | |
128 | .probe = sun6i_prcm_probe, | |
129 | }; | |
130 | module_platform_driver(sun6i_prcm_driver); | |
131 | ||
132 | MODULE_AUTHOR("Boris BREZILLON <boris.brezillon@free-electrons.com>"); | |
133 | MODULE_DESCRIPTION("Allwinner sun6i PRCM driver"); | |
134 | MODULE_LICENSE("GPL v2"); |