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 u32 reset_pwrdwn_delay_ms; 32 }; 33 34 #define to_pwrseq_sd8787(p) container_of(p, struct mmc_pwrseq_sd8787, pwrseq) 35 36 static void mmc_pwrseq_sd8787_pre_power_on(struct mmc_host *host) 37 { 38 struct mmc_pwrseq_sd8787 *pwrseq = to_pwrseq_sd8787(host->pwrseq); 39 40 gpiod_set_value_cansleep(pwrseq->reset_gpio, 1); 41 42 msleep(pwrseq->reset_pwrdwn_delay_ms); 43 gpiod_set_value_cansleep(pwrseq->pwrdn_gpio, 1); 44 } 45 46 static void mmc_pwrseq_sd8787_power_off(struct mmc_host *host) 47 { 48 struct mmc_pwrseq_sd8787 *pwrseq = to_pwrseq_sd8787(host->pwrseq); 49 50 gpiod_set_value_cansleep(pwrseq->pwrdn_gpio, 0); 51 gpiod_set_value_cansleep(pwrseq->reset_gpio, 0); 52 } 53 54 static const struct mmc_pwrseq_ops mmc_pwrseq_sd8787_ops = { 55 .pre_power_on = mmc_pwrseq_sd8787_pre_power_on, 56 .power_off = mmc_pwrseq_sd8787_power_off, 57 }; 58 59 static const u32 sd8787_delay_ms = 300; 60 static const u32 wilc1000_delay_ms = 5; 61 62 static const struct of_device_id mmc_pwrseq_sd8787_of_match[] = { 63 { .compatible = "mmc-pwrseq-sd8787", .data = &sd8787_delay_ms }, 64 { .compatible = "mmc-pwrseq-wilc1000", .data = &wilc1000_delay_ms }, 65 {/* sentinel */}, 66 }; 67 MODULE_DEVICE_TABLE(of, mmc_pwrseq_sd8787_of_match); 68 69 static int mmc_pwrseq_sd8787_probe(struct platform_device *pdev) 70 { 71 struct mmc_pwrseq_sd8787 *pwrseq; 72 struct device *dev = &pdev->dev; 73 const struct of_device_id *match; 74 75 pwrseq = devm_kzalloc(dev, sizeof(*pwrseq), GFP_KERNEL); 76 if (!pwrseq) 77 return -ENOMEM; 78 79 match = of_match_node(mmc_pwrseq_sd8787_of_match, pdev->dev.of_node); 80 pwrseq->reset_pwrdwn_delay_ms = *(u32 *)match->data; 81 82 pwrseq->pwrdn_gpio = devm_gpiod_get(dev, "powerdown", GPIOD_OUT_LOW); 83 if (IS_ERR(pwrseq->pwrdn_gpio)) 84 return PTR_ERR(pwrseq->pwrdn_gpio); 85 86 pwrseq->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW); 87 if (IS_ERR(pwrseq->reset_gpio)) 88 return PTR_ERR(pwrseq->reset_gpio); 89 90 pwrseq->pwrseq.dev = dev; 91 pwrseq->pwrseq.ops = &mmc_pwrseq_sd8787_ops; 92 pwrseq->pwrseq.owner = THIS_MODULE; 93 platform_set_drvdata(pdev, pwrseq); 94 95 return mmc_pwrseq_register(&pwrseq->pwrseq); 96 } 97 98 static int mmc_pwrseq_sd8787_remove(struct platform_device *pdev) 99 { 100 struct mmc_pwrseq_sd8787 *pwrseq = platform_get_drvdata(pdev); 101 102 mmc_pwrseq_unregister(&pwrseq->pwrseq); 103 104 return 0; 105 } 106 107 static struct platform_driver mmc_pwrseq_sd8787_driver = { 108 .probe = mmc_pwrseq_sd8787_probe, 109 .remove = mmc_pwrseq_sd8787_remove, 110 .driver = { 111 .name = "pwrseq_sd8787", 112 .of_match_table = mmc_pwrseq_sd8787_of_match, 113 }, 114 }; 115 116 module_platform_driver(mmc_pwrseq_sd8787_driver); 117 MODULE_LICENSE("GPL v2"); 118