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3aa8793f UH |
1 | /* |
2 | * Copyright (C) 2014 Linaro Ltd | |
3 | * | |
4 | * Author: Ulf Hansson <ulf.hansson@linaro.org> | |
5 | * | |
6 | * License terms: GNU General Public License (GPL) version 2 | |
7 | * | |
8 | * MMC power sequence management | |
9 | */ | |
8c96f89c UH |
10 | #include <linux/kernel.h> |
11 | #include <linux/platform_device.h> | |
12 | #include <linux/err.h> | |
13 | #include <linux/of.h> | |
14 | #include <linux/of_platform.h> | |
15 | ||
3aa8793f UH |
16 | #include <linux/mmc/host.h> |
17 | ||
18 | #include "pwrseq.h" | |
19 | ||
8c96f89c UH |
20 | struct mmc_pwrseq_match { |
21 | const char *compatible; | |
0f12a0ce | 22 | struct mmc_pwrseq *(*alloc)(struct mmc_host *host, struct device *dev); |
8c96f89c UH |
23 | }; |
24 | ||
25 | static struct mmc_pwrseq_match pwrseq_match[] = { | |
26 | { | |
27 | .compatible = "mmc-pwrseq-simple", | |
28 | .alloc = mmc_pwrseq_simple_alloc, | |
726b6324 MS |
29 | }, { |
30 | .compatible = "mmc-pwrseq-emmc", | |
31 | .alloc = mmc_pwrseq_emmc_alloc, | |
8c96f89c UH |
32 | }, |
33 | }; | |
34 | ||
35 | static struct mmc_pwrseq_match *mmc_pwrseq_find(struct device_node *np) | |
36 | { | |
37 | struct mmc_pwrseq_match *match = ERR_PTR(-ENODEV); | |
38 | int i; | |
39 | ||
40 | for (i = 0; i < ARRAY_SIZE(pwrseq_match); i++) { | |
41 | if (of_device_is_compatible(np, pwrseq_match[i].compatible)) { | |
42 | match = &pwrseq_match[i]; | |
43 | break; | |
44 | } | |
45 | } | |
46 | ||
47 | return match; | |
48 | } | |
3aa8793f UH |
49 | |
50 | int mmc_pwrseq_alloc(struct mmc_host *host) | |
51 | { | |
8c96f89c UH |
52 | struct platform_device *pdev; |
53 | struct device_node *np; | |
54 | struct mmc_pwrseq_match *match; | |
0f12a0ce | 55 | struct mmc_pwrseq *pwrseq; |
8c96f89c UH |
56 | int ret = 0; |
57 | ||
58 | np = of_parse_phandle(host->parent->of_node, "mmc-pwrseq", 0); | |
59 | if (!np) | |
60 | return 0; | |
61 | ||
62 | pdev = of_find_device_by_node(np); | |
63 | if (!pdev) { | |
64 | ret = -ENODEV; | |
65 | goto err; | |
66 | } | |
67 | ||
68 | match = mmc_pwrseq_find(np); | |
69 | if (IS_ERR(match)) { | |
70 | ret = PTR_ERR(match); | |
71 | goto err; | |
72 | } | |
73 | ||
0f12a0ce AC |
74 | pwrseq = match->alloc(host, &pdev->dev); |
75 | if (IS_ERR(pwrseq)) { | |
76 | ret = PTR_ERR(host->pwrseq); | |
77 | goto err; | |
78 | } | |
79 | ||
80 | host->pwrseq = pwrseq; | |
81 | dev_info(host->parent, "allocated mmc-pwrseq\n"); | |
8c96f89c UH |
82 | |
83 | err: | |
84 | of_node_put(np); | |
85 | return ret; | |
3aa8793f UH |
86 | } |
87 | ||
88 | void mmc_pwrseq_pre_power_on(struct mmc_host *host) | |
89 | { | |
90 | struct mmc_pwrseq *pwrseq = host->pwrseq; | |
91 | ||
92 | if (pwrseq && pwrseq->ops && pwrseq->ops->pre_power_on) | |
93 | pwrseq->ops->pre_power_on(host); | |
94 | } | |
95 | ||
96 | void mmc_pwrseq_post_power_on(struct mmc_host *host) | |
97 | { | |
98 | struct mmc_pwrseq *pwrseq = host->pwrseq; | |
99 | ||
100 | if (pwrseq && pwrseq->ops && pwrseq->ops->post_power_on) | |
101 | pwrseq->ops->post_power_on(host); | |
102 | } | |
103 | ||
104 | void mmc_pwrseq_power_off(struct mmc_host *host) | |
105 | { | |
106 | struct mmc_pwrseq *pwrseq = host->pwrseq; | |
107 | ||
108 | if (pwrseq && pwrseq->ops && pwrseq->ops->power_off) | |
109 | pwrseq->ops->power_off(host); | |
110 | } | |
111 | ||
112 | void mmc_pwrseq_free(struct mmc_host *host) | |
113 | { | |
114 | struct mmc_pwrseq *pwrseq = host->pwrseq; | |
115 | ||
116 | if (pwrseq && pwrseq->ops && pwrseq->ops->free) | |
117 | pwrseq->ops->free(host); | |
0f12a0ce AC |
118 | |
119 | host->pwrseq = NULL; | |
3aa8793f | 120 | } |