From de19b4c928ce4f2ab88fc49888627313fd2c49e4 Mon Sep 17 00:00:00 2001 From: Matt Ranostay Date: Mon, 23 Jan 2017 19:08:30 -0800 Subject: [PATCH] mmc: pwrseq: add support for Marvell SD8787 chip Allow power sequencing for the Marvell SD8787 Wifi/BT chip. This can be abstracted to other chipsets if needed in the future. Cc: Tony Lindgren Cc: Ulf Hansson Signed-off-by: Matt Ranostay Signed-off-by: Ulf Hansson --- drivers/mmc/core/Kconfig | 10 +++ drivers/mmc/core/Makefile | 1 + drivers/mmc/core/pwrseq_sd8787.c | 117 +++++++++++++++++++++++++++++++ 3 files changed, 128 insertions(+) create mode 100644 drivers/mmc/core/pwrseq_sd8787.c diff --git a/drivers/mmc/core/Kconfig b/drivers/mmc/core/Kconfig index cdfa8520a4b1..fc1ecdaaa9ca 100644 --- a/drivers/mmc/core/Kconfig +++ b/drivers/mmc/core/Kconfig @@ -12,6 +12,16 @@ config PWRSEQ_EMMC This driver can also be built as a module. If so, the module will be called pwrseq_emmc. +config PWRSEQ_SD8787 + tristate "HW reset support for SD8787 BT + Wifi module" + depends on OF && (MWIFIEX || BT_MRVL_SDIO) + help + This selects hardware reset support for the SD8787 BT + Wifi + module. By default this option is set to n. + + This driver can also be built as a module. If so, the module + will be called pwrseq_sd8787. + config PWRSEQ_SIMPLE tristate "Simple HW reset support for MMC" default y diff --git a/drivers/mmc/core/Makefile b/drivers/mmc/core/Makefile index b2a257dc644f..0f81464fa824 100644 --- a/drivers/mmc/core/Makefile +++ b/drivers/mmc/core/Makefile @@ -10,6 +10,7 @@ mmc_core-y := core.o bus.o host.o \ quirks.o slot-gpio.o mmc_core-$(CONFIG_OF) += pwrseq.o obj-$(CONFIG_PWRSEQ_SIMPLE) += pwrseq_simple.o +obj-$(CONFIG_PWRSEQ_SD8787) += pwrseq_sd8787.o obj-$(CONFIG_PWRSEQ_EMMC) += pwrseq_emmc.o mmc_core-$(CONFIG_DEBUG_FS) += debugfs.o obj-$(CONFIG_MMC_BLOCK) += mmc_block.o diff --git a/drivers/mmc/core/pwrseq_sd8787.c b/drivers/mmc/core/pwrseq_sd8787.c new file mode 100644 index 000000000000..1a21e14458d3 --- /dev/null +++ b/drivers/mmc/core/pwrseq_sd8787.c @@ -0,0 +1,117 @@ +/* + * pwrseq_sd8787.c - power sequence support for Marvell SD8787 BT + Wifi chip + * + * Copyright (C) 2016 Matt Ranostay + * + * Based on the original work pwrseq_simple.c + * Copyright (C) 2014 Linaro Ltd + * Author: Ulf Hansson + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#include "pwrseq.h" + +struct mmc_pwrseq_sd8787 { + struct mmc_pwrseq pwrseq; + struct gpio_desc *reset_gpio; + struct gpio_desc *pwrdn_gpio; +}; + +#define to_pwrseq_sd8787(p) container_of(p, struct mmc_pwrseq_sd8787, pwrseq) + +static void mmc_pwrseq_sd8787_pre_power_on(struct mmc_host *host) +{ + struct mmc_pwrseq_sd8787 *pwrseq = to_pwrseq_sd8787(host->pwrseq); + + gpiod_set_value_cansleep(pwrseq->reset_gpio, 1); + + msleep(300); + gpiod_set_value_cansleep(pwrseq->pwrdn_gpio, 1); +} + +static void mmc_pwrseq_sd8787_power_off(struct mmc_host *host) +{ + struct mmc_pwrseq_sd8787 *pwrseq = to_pwrseq_sd8787(host->pwrseq); + + gpiod_set_value_cansleep(pwrseq->pwrdn_gpio, 0); + gpiod_set_value_cansleep(pwrseq->reset_gpio, 0); +} + +static const struct mmc_pwrseq_ops mmc_pwrseq_sd8787_ops = { + .pre_power_on = mmc_pwrseq_sd8787_pre_power_on, + .power_off = mmc_pwrseq_sd8787_power_off, +}; + +static const struct of_device_id mmc_pwrseq_sd8787_of_match[] = { + { .compatible = "mmc-pwrseq-sd8787",}, + {/* sentinel */}, +}; +MODULE_DEVICE_TABLE(of, mmc_pwrseq_sd8787_of_match); + +static int mmc_pwrseq_sd8787_probe(struct platform_device *pdev) +{ + struct mmc_pwrseq_sd8787 *pwrseq; + struct device *dev = &pdev->dev; + + pwrseq = devm_kzalloc(dev, sizeof(*pwrseq), GFP_KERNEL); + if (!pwrseq) + return -ENOMEM; + + pwrseq->pwrdn_gpio = devm_gpiod_get(dev, "powerdown", GPIOD_OUT_LOW); + if (IS_ERR(pwrseq->pwrdn_gpio)) + return PTR_ERR(pwrseq->pwrdn_gpio); + + pwrseq->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW); + if (IS_ERR(pwrseq->reset_gpio)) + return PTR_ERR(pwrseq->reset_gpio); + + pwrseq->pwrseq.dev = dev; + pwrseq->pwrseq.ops = &mmc_pwrseq_sd8787_ops; + pwrseq->pwrseq.owner = THIS_MODULE; + platform_set_drvdata(pdev, pwrseq); + + return mmc_pwrseq_register(&pwrseq->pwrseq); +} + +static int mmc_pwrseq_sd8787_remove(struct platform_device *pdev) +{ + struct mmc_pwrseq_sd8787 *pwrseq = platform_get_drvdata(pdev); + + mmc_pwrseq_unregister(&pwrseq->pwrseq); + + return 0; +} + +static struct platform_driver mmc_pwrseq_sd8787_driver = { + .probe = mmc_pwrseq_sd8787_probe, + .remove = mmc_pwrseq_sd8787_remove, + .driver = { + .name = "pwrseq_sd8787", + .of_match_table = mmc_pwrseq_sd8787_of_match, + }, +}; + +module_platform_driver(mmc_pwrseq_sd8787_driver); +MODULE_LICENSE("GPL v2");