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 */
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
16#include <linux/mmc/host.h>
17
18#include "pwrseq.h"
19
20struct mmc_pwrseq_match {
21	const char *compatible;
22	struct mmc_pwrseq *(*alloc)(struct mmc_host *host, struct device *dev);
23};
24
25static struct mmc_pwrseq_match pwrseq_match[] = {
26	{
27		.compatible = "mmc-pwrseq-simple",
28		.alloc = mmc_pwrseq_simple_alloc,
29	}, {
30		.compatible = "mmc-pwrseq-emmc",
31		.alloc = mmc_pwrseq_emmc_alloc,
32	},
33};
34
35static 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}
49
50int mmc_pwrseq_alloc(struct mmc_host *host)
51{
52	struct platform_device *pdev;
53	struct device_node *np;
54	struct mmc_pwrseq_match *match;
55	struct mmc_pwrseq *pwrseq;
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
74	pwrseq = match->alloc(host, &pdev->dev);
75	if (IS_ERR(pwrseq)) {
76		ret = PTR_ERR(pwrseq);
77		goto err;
78	}
79
80	host->pwrseq = pwrseq;
81	dev_info(host->parent, "allocated mmc-pwrseq\n");
82
83err:
84	of_node_put(np);
85	return ret;
86}
87
88void 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
96void 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
104void 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
112void 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);
118
119	host->pwrseq = NULL;
120}
121