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 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 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 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 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 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 } 115 116 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