1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * pwrseq_sd8787.c - power sequence support for Marvell SD8787 BT + Wifi chip
4 *
5 * Copyright (C) 2016 Matt Ranostay <matt@ranostay.consulting>
6 *
7 * Based on the original work pwrseq_simple.c
8 * Copyright (C) 2014 Linaro Ltd
9 * Author: Ulf Hansson <ulf.hansson@linaro.org>
10 */
11
12 #include <linux/delay.h>
13 #include <linux/init.h>
14 #include <linux/kernel.h>
15 #include <linux/platform_device.h>
16 #include <linux/module.h>
17 #include <linux/of.h>
18 #include <linux/slab.h>
19 #include <linux/device.h>
20 #include <linux/err.h>
21 #include <linux/gpio/consumer.h>
22
23 #include <linux/mmc/host.h>
24
25 #include "pwrseq.h"
26
27 struct mmc_pwrseq_sd8787 {
28 struct mmc_pwrseq pwrseq;
29 struct gpio_desc *reset_gpio;
30 struct gpio_desc *pwrdn_gpio;
31 };
32
33 #define to_pwrseq_sd8787(p) container_of(p, struct mmc_pwrseq_sd8787, pwrseq)
34
mmc_pwrseq_sd8787_pre_power_on(struct mmc_host * host)35 static void mmc_pwrseq_sd8787_pre_power_on(struct mmc_host *host)
36 {
37 struct mmc_pwrseq_sd8787 *pwrseq = to_pwrseq_sd8787(host->pwrseq);
38
39 gpiod_set_value_cansleep(pwrseq->reset_gpio, 1);
40
41 msleep(300);
42 gpiod_set_value_cansleep(pwrseq->pwrdn_gpio, 1);
43 }
44
mmc_pwrseq_sd8787_power_off(struct mmc_host * host)45 static void mmc_pwrseq_sd8787_power_off(struct mmc_host *host)
46 {
47 struct mmc_pwrseq_sd8787 *pwrseq = to_pwrseq_sd8787(host->pwrseq);
48
49 gpiod_set_value_cansleep(pwrseq->pwrdn_gpio, 0);
50 gpiod_set_value_cansleep(pwrseq->reset_gpio, 0);
51 }
52
mmc_pwrseq_wilc1000_pre_power_on(struct mmc_host * host)53 static void mmc_pwrseq_wilc1000_pre_power_on(struct mmc_host *host)
54 {
55 struct mmc_pwrseq_sd8787 *pwrseq = to_pwrseq_sd8787(host->pwrseq);
56
57 /* The pwrdn_gpio is really CHIP_EN, reset_gpio is RESETN */
58 gpiod_set_value_cansleep(pwrseq->pwrdn_gpio, 1);
59 msleep(5);
60 gpiod_set_value_cansleep(pwrseq->reset_gpio, 1);
61 }
62
mmc_pwrseq_wilc1000_power_off(struct mmc_host * host)63 static void mmc_pwrseq_wilc1000_power_off(struct mmc_host *host)
64 {
65 struct mmc_pwrseq_sd8787 *pwrseq = to_pwrseq_sd8787(host->pwrseq);
66
67 gpiod_set_value_cansleep(pwrseq->reset_gpio, 0);
68 gpiod_set_value_cansleep(pwrseq->pwrdn_gpio, 0);
69 }
70
71 static const struct mmc_pwrseq_ops mmc_pwrseq_sd8787_ops = {
72 .pre_power_on = mmc_pwrseq_sd8787_pre_power_on,
73 .power_off = mmc_pwrseq_sd8787_power_off,
74 };
75
76 static const struct mmc_pwrseq_ops mmc_pwrseq_wilc1000_ops = {
77 .pre_power_on = mmc_pwrseq_wilc1000_pre_power_on,
78 .power_off = mmc_pwrseq_wilc1000_power_off,
79 };
80
81 static const struct of_device_id mmc_pwrseq_sd8787_of_match[] = {
82 { .compatible = "mmc-pwrseq-sd8787", .data = &mmc_pwrseq_sd8787_ops },
83 { .compatible = "mmc-pwrseq-wilc1000", .data = &mmc_pwrseq_wilc1000_ops },
84 {/* sentinel */},
85 };
86 MODULE_DEVICE_TABLE(of, mmc_pwrseq_sd8787_of_match);
87
mmc_pwrseq_sd8787_probe(struct platform_device * pdev)88 static int mmc_pwrseq_sd8787_probe(struct platform_device *pdev)
89 {
90 struct mmc_pwrseq_sd8787 *pwrseq;
91 struct device *dev = &pdev->dev;
92 const struct of_device_id *match;
93
94 pwrseq = devm_kzalloc(dev, sizeof(*pwrseq), GFP_KERNEL);
95 if (!pwrseq)
96 return -ENOMEM;
97
98 match = of_match_node(mmc_pwrseq_sd8787_of_match, pdev->dev.of_node);
99
100 pwrseq->pwrdn_gpio = devm_gpiod_get(dev, "powerdown", GPIOD_OUT_LOW);
101 if (IS_ERR(pwrseq->pwrdn_gpio))
102 return PTR_ERR(pwrseq->pwrdn_gpio);
103
104 pwrseq->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
105 if (IS_ERR(pwrseq->reset_gpio))
106 return PTR_ERR(pwrseq->reset_gpio);
107
108 pwrseq->pwrseq.dev = dev;
109 pwrseq->pwrseq.ops = match->data;
110 pwrseq->pwrseq.owner = THIS_MODULE;
111 platform_set_drvdata(pdev, pwrseq);
112
113 return mmc_pwrseq_register(&pwrseq->pwrseq);
114 }
115
mmc_pwrseq_sd8787_remove(struct platform_device * pdev)116 static void mmc_pwrseq_sd8787_remove(struct platform_device *pdev)
117 {
118 struct mmc_pwrseq_sd8787 *pwrseq = platform_get_drvdata(pdev);
119
120 mmc_pwrseq_unregister(&pwrseq->pwrseq);
121 }
122
123 static struct platform_driver mmc_pwrseq_sd8787_driver = {
124 .probe = mmc_pwrseq_sd8787_probe,
125 .remove_new = mmc_pwrseq_sd8787_remove,
126 .driver = {
127 .name = "pwrseq_sd8787",
128 .of_match_table = mmc_pwrseq_sd8787_of_match,
129 },
130 };
131
132 module_platform_driver(mmc_pwrseq_sd8787_driver);
133 MODULE_LICENSE("GPL v2");
134