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 <tony@xxxxxxxxxxx> Cc: Ulf Hansson <ulf.hansson@xxxxxxxxxx> Cc: Mark Rutland <mark.rutland@xxxxxxx> Cc: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx> Signed-off-by: Matt Ranostay <matt@ranostay.consulting> --- .../devicetree/bindings/mmc/mmc-pwrseq-sd8787.txt | 14 +++ .../bindings/net/wireless/marvell-sd8xxx.txt | 4 + drivers/mmc/core/Kconfig | 10 ++ drivers/mmc/core/Makefile | 1 + drivers/mmc/core/pwrseq_sd8787.c | 117 +++++++++++++++++++++ 5 files changed, 146 insertions(+) create mode 100644 Documentation/devicetree/bindings/mmc/mmc-pwrseq-sd8787.txt create mode 100644 drivers/mmc/core/pwrseq_sd8787.c diff --git a/Documentation/devicetree/bindings/mmc/mmc-pwrseq-sd8787.txt b/Documentation/devicetree/bindings/mmc/mmc-pwrseq-sd8787.txt new file mode 100644 index 000000000000..1b658351629b --- /dev/null +++ b/Documentation/devicetree/bindings/mmc/mmc-pwrseq-sd8787.txt @@ -0,0 +1,14 @@ +* Marvell SD8787 power sequence provider + +Required properties: +- compatible: must be "mmc-pwrseq-sd8787". +- pwndn-gpio: contains a power down GPIO specifier. +- reset-gpio: contains a reset GPIO specifier. + +Example: + + wifi_pwrseq: wifi_pwrseq { + compatible = "mmc-pwrseq-sd8787"; + pwrdn-gpio = <&twl_gpio 0 GPIO_ACTIVE_LOW>; + reset-gpio = <&twl_gpio 1 GPIO_ACTIVE_LOW>; + } diff --git a/Documentation/devicetree/bindings/net/wireless/marvell-sd8xxx.txt b/Documentation/devicetree/bindings/net/wireless/marvell-sd8xxx.txt index c421aba0a5bc..08fd65d35725 100644 --- a/Documentation/devicetree/bindings/net/wireless/marvell-sd8xxx.txt +++ b/Documentation/devicetree/bindings/net/wireless/marvell-sd8xxx.txt @@ -32,6 +32,9 @@ Optional properties: so that the wifi chip can wakeup host platform under certain condition. during system resume, the irq will be disabled to make sure unnecessary interrupt is not received. + - vmmc-supply: a phandle of a regulator, supplying VCC to the card + - mmc-pwrseq: phandle to the MMC power sequence node. See "mmc-pwrseq-*" + for documentation of MMC power sequence bindings. Example: @@ -44,6 +47,7 @@ so that firmware can wakeup host using this device side pin. &mmc3 { status = "okay"; vmmc-supply = <&wlan_en_reg>; + mmc-pwrseq = <&wifi_pwrseq>; bus-width = <4>; cap-power-off-card; keep-power-in-suspend; diff --git a/drivers/mmc/core/Kconfig b/drivers/mmc/core/Kconfig index 250f223aaa80..cf61d676ac06 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 f007151dfdc6..f1c060e56d4e 100644 --- a/drivers/mmc/core/Makefile +++ b/drivers/mmc/core/Makefile @@ -10,5 +10,6 @@ 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 diff --git a/drivers/mmc/core/pwrseq_sd8787.c b/drivers/mmc/core/pwrseq_sd8787.c new file mode 100644 index 000000000000..f4080fe6439e --- /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 <matt@ranostay.consulting> + * + * Based on the original work pwrseq_simple.c + * Copyright (C) 2014 Linaro Ltd + * Author: Ulf Hansson <ulf.hansson@xxxxxxxxxx> + * + * 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 <linux/delay.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/platform_device.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/device.h> +#include <linux/err.h> +#include <linux/gpio/consumer.h> + +#include <linux/mmc/host.h> + +#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, "pwrdn", 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"); -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html