From patchwork Sun Aug 29 13:12:54 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Baryshkov X-Patchwork-Id: 504114 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 71BD1C43214 for ; Sun, 29 Aug 2021 13:14:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5EB1B60F38 for ; Sun, 29 Aug 2021 13:14:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235767AbhH2NPe (ORCPT ); Sun, 29 Aug 2021 09:15:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46988 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235409AbhH2NOF (ORCPT ); Sun, 29 Aug 2021 09:14:05 -0400 Received: from mail-lf1-x12d.google.com (mail-lf1-x12d.google.com [IPv6:2a00:1450:4864:20::12d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 665DAC0617AF for ; Sun, 29 Aug 2021 06:13:13 -0700 (PDT) Received: by mail-lf1-x12d.google.com with SMTP id c8so12699656lfi.3 for ; Sun, 29 Aug 2021 06:13:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=77LQWfyVKMoi73qcXWTeFPSwjbiChQAfjnB164skbi4=; b=F7nJu+GO+HQuwgLZrS62N16GEljKer+Oo3YGlCAQjsSE/Njj5LzzFwhPbEzCxP94JK rOzm+jfZ3hLXWiuqetSAH6DRo4SvVTYna5jJWTOe2hZ+pK97+6UXfiWQWKJtOMMKa8sH oYIRj91RsdGMPzqg/7mDoJTOd08wNwidKyQ4LJekn8RgxrIk4w964ropQCCa+H8rscWa ex2ZlZQTyDxMh1l2Ke2b/DT5CLwEAbySyK8E1TNL/skfx07zCT62fxsScRQGFCcgU/z4 sARKhGpeGRBH6hnmWThr+wbnFMpPbz11vNgfV0NcVucpt3QUB4Y34CICIF1IYLr/AnQh rvwQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=77LQWfyVKMoi73qcXWTeFPSwjbiChQAfjnB164skbi4=; b=phXxixu07eqL9CJPqpLRuNCZ6TUsLjOUZT9Rx1VJio7D/tdQ0odr1DpcFJacS0i9ut OJs3UhB/gqO7kXOhrakimDq/R2PqmdTEecUzOpjDHTxTkVhL9/AYRB2mCCIsO5/1CK+k 4P1Ym/a7mS1Irz87HyUSqXvvoYziKPgykZI1peCFBnZzdlvt41cLC6l6EAquGAzpIKGO GY7wDjfNTCAaPNwrhpB3xrQNtcZrM4omiYbjEs1x9VvaSC1uiw2FFcWZT/R4IlOu6jib SeBJ5dVvSTC9UHZYxrimGc3WoVotiVzSrHNJyDUBD5dZ5cEgRa2GBwo6kAtpBRmPzQCs 3Pew== X-Gm-Message-State: AOAM533lm/BQ+VS5V2bmPUw5nNqFg9BJNu6lNO0igHI3hONGVUSvMJkq VO449Q1MvR4hOweooOyOC4ISSA== X-Google-Smtp-Source: ABdhPJybr5Jaw2i5q9no+zvN/s79iVW44buANCnoNX4NFJsLVg6o1dmQ13pW9bFnNi3dN4y2amXkEA== X-Received: by 2002:a05:6512:11e9:: with SMTP id p9mr14218015lfs.372.1630242791547; Sun, 29 Aug 2021 06:13:11 -0700 (PDT) Received: from eriador.lan ([37.153.55.125]) by smtp.gmail.com with ESMTPSA id x13sm712503lfq.262.2021.08.29.06.13.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 29 Aug 2021 06:13:11 -0700 (PDT) From: Dmitry Baryshkov To: Andy Gross , Bjorn Andersson , Ulf Hansson , Marcel Holtmann , Johan Hedberg , Luiz Augusto von Dentz , Kalle Valo , "David S. Miller" , Jakub Kicinski , Stanimir Varbanov Cc: linux-arm-msm@vger.kernel.org, linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-bluetooth@vger.kernel.org, ath10k@lists.infradead.org, linux-wireless@vger.kernel.org, netdev@vger.kernel.org Subject: [RFC v2 02/13] pwrseq: port MMC's pwrseq drivers to new pwrseq subsystem Date: Sun, 29 Aug 2021 16:12:54 +0300 Message-Id: <20210829131305.534417-3-dmitry.baryshkov@linaro.org> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210829131305.534417-1-dmitry.baryshkov@linaro.org> References: <20210829131305.534417-1-dmitry.baryshkov@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org Port MMC's all pwrseq drivers to new pwrseq subsystem. Signed-off-by: Dmitry Baryshkov --- .../pwrseq}/mmc-pwrseq-emmc.yaml | 0 .../pwrseq}/mmc-pwrseq-sd8787.yaml | 0 .../pwrseq}/mmc-pwrseq-simple.yaml | 0 drivers/mmc/core/Kconfig | 32 ---- drivers/mmc/core/Makefile | 3 - drivers/mmc/core/pwrseq_emmc.c | 120 ------------- drivers/mmc/core/pwrseq_sd8787.c | 107 ------------ drivers/mmc/core/pwrseq_simple.c | 164 ------------------ drivers/power/pwrseq/Kconfig | 32 ++++ drivers/power/pwrseq/Makefile | 4 + drivers/power/pwrseq/pwrseq_emmc.c | 119 +++++++++++++ drivers/power/pwrseq/pwrseq_sd8787.c | 98 +++++++++++ drivers/power/pwrseq/pwrseq_simple.c | 160 +++++++++++++++++ 13 files changed, 413 insertions(+), 426 deletions(-) rename Documentation/devicetree/bindings/{mmc => power/pwrseq}/mmc-pwrseq-emmc.yaml (100%) rename Documentation/devicetree/bindings/{mmc => power/pwrseq}/mmc-pwrseq-sd8787.yaml (100%) rename Documentation/devicetree/bindings/{mmc => power/pwrseq}/mmc-pwrseq-simple.yaml (100%) delete mode 100644 drivers/mmc/core/pwrseq_emmc.c delete mode 100644 drivers/mmc/core/pwrseq_sd8787.c delete mode 100644 drivers/mmc/core/pwrseq_simple.c create mode 100644 drivers/power/pwrseq/pwrseq_emmc.c create mode 100644 drivers/power/pwrseq/pwrseq_sd8787.c create mode 100644 drivers/power/pwrseq/pwrseq_simple.c diff --git a/Documentation/devicetree/bindings/mmc/mmc-pwrseq-emmc.yaml b/Documentation/devicetree/bindings/power/pwrseq/mmc-pwrseq-emmc.yaml similarity index 100% rename from Documentation/devicetree/bindings/mmc/mmc-pwrseq-emmc.yaml rename to Documentation/devicetree/bindings/power/pwrseq/mmc-pwrseq-emmc.yaml diff --git a/Documentation/devicetree/bindings/mmc/mmc-pwrseq-sd8787.yaml b/Documentation/devicetree/bindings/power/pwrseq/mmc-pwrseq-sd8787.yaml similarity index 100% rename from Documentation/devicetree/bindings/mmc/mmc-pwrseq-sd8787.yaml rename to Documentation/devicetree/bindings/power/pwrseq/mmc-pwrseq-sd8787.yaml diff --git a/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.yaml b/Documentation/devicetree/bindings/power/pwrseq/mmc-pwrseq-simple.yaml similarity index 100% rename from Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.yaml rename to Documentation/devicetree/bindings/power/pwrseq/mmc-pwrseq-simple.yaml diff --git a/drivers/mmc/core/Kconfig b/drivers/mmc/core/Kconfig index ae8b69aee619..cf7df64ce009 100644 --- a/drivers/mmc/core/Kconfig +++ b/drivers/mmc/core/Kconfig @@ -2,38 +2,6 @@ # # MMC core configuration # -config PWRSEQ_EMMC - tristate "HW reset support for eMMC" - default y - depends on OF - help - This selects Hardware reset support aka pwrseq-emmc for eMMC - devices. By default this option is set to y. - - 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 || LIBERTAS_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 - depends on OF - help - This selects simple hardware reset support aka pwrseq-simple for MMC - devices. By default this option is set to y. - - This driver can also be built as a module. If so, the module - will be called pwrseq_simple. - config MMC_BLOCK tristate "MMC block device driver" depends on BLOCK diff --git a/drivers/mmc/core/Makefile b/drivers/mmc/core/Makefile index 6a907736cd7a..322eb69bd00e 100644 --- a/drivers/mmc/core/Makefile +++ b/drivers/mmc/core/Makefile @@ -10,9 +10,6 @@ mmc_core-y := core.o bus.o host.o \ sdio_cis.o sdio_io.o sdio_irq.o \ slot-gpio.o regulator.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 mmc_block-objs := block.o queue.o diff --git a/drivers/mmc/core/pwrseq_emmc.c b/drivers/mmc/core/pwrseq_emmc.c deleted file mode 100644 index f6dde9edd7a3..000000000000 --- a/drivers/mmc/core/pwrseq_emmc.c +++ /dev/null @@ -1,120 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * Copyright (C) 2015, Samsung Electronics Co., Ltd. - * - * Author: Marek Szyprowski - * - * Simple eMMC hardware reset provider - */ -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include - -#include "pwrseq.h" - -struct mmc_pwrseq_emmc { - struct mmc_pwrseq pwrseq; - struct notifier_block reset_nb; - struct gpio_desc *reset_gpio; -}; - -#define to_pwrseq_emmc(p) container_of(p, struct mmc_pwrseq_emmc, pwrseq) - -static void mmc_pwrseq_emmc_reset(struct mmc_host *host) -{ - struct mmc_pwrseq_emmc *pwrseq = to_pwrseq_emmc(host->pwrseq); - - gpiod_set_value_cansleep(pwrseq->reset_gpio, 1); - udelay(1); - gpiod_set_value_cansleep(pwrseq->reset_gpio, 0); - udelay(200); -} - -static int mmc_pwrseq_emmc_reset_nb(struct notifier_block *this, - unsigned long mode, void *cmd) -{ - struct mmc_pwrseq_emmc *pwrseq = container_of(this, - struct mmc_pwrseq_emmc, reset_nb); - gpiod_set_value(pwrseq->reset_gpio, 1); - udelay(1); - gpiod_set_value(pwrseq->reset_gpio, 0); - udelay(200); - - return NOTIFY_DONE; -} - -static const struct mmc_pwrseq_ops mmc_pwrseq_emmc_ops = { - .reset = mmc_pwrseq_emmc_reset, -}; - -static int mmc_pwrseq_emmc_probe(struct platform_device *pdev) -{ - struct mmc_pwrseq_emmc *pwrseq; - struct device *dev = &pdev->dev; - - pwrseq = devm_kzalloc(dev, sizeof(*pwrseq), GFP_KERNEL); - if (!pwrseq) - return -ENOMEM; - - pwrseq->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW); - if (IS_ERR(pwrseq->reset_gpio)) - return PTR_ERR(pwrseq->reset_gpio); - - if (!gpiod_cansleep(pwrseq->reset_gpio)) { - /* - * register reset handler to ensure emmc reset also from - * emergency_reboot(), priority 255 is the highest priority - * so it will be executed before any system reboot handler. - */ - pwrseq->reset_nb.notifier_call = mmc_pwrseq_emmc_reset_nb; - pwrseq->reset_nb.priority = 255; - register_restart_handler(&pwrseq->reset_nb); - } else { - dev_notice(dev, "EMMC reset pin tied to a sleepy GPIO driver; reset on emergency-reboot disabled\n"); - } - - pwrseq->pwrseq.ops = &mmc_pwrseq_emmc_ops; - pwrseq->pwrseq.dev = dev; - pwrseq->pwrseq.owner = THIS_MODULE; - platform_set_drvdata(pdev, pwrseq); - - return mmc_pwrseq_register(&pwrseq->pwrseq); -} - -static int mmc_pwrseq_emmc_remove(struct platform_device *pdev) -{ - struct mmc_pwrseq_emmc *pwrseq = platform_get_drvdata(pdev); - - unregister_restart_handler(&pwrseq->reset_nb); - mmc_pwrseq_unregister(&pwrseq->pwrseq); - - return 0; -} - -static const struct of_device_id mmc_pwrseq_emmc_of_match[] = { - { .compatible = "mmc-pwrseq-emmc",}, - {/* sentinel */}, -}; - -MODULE_DEVICE_TABLE(of, mmc_pwrseq_emmc_of_match); - -static struct platform_driver mmc_pwrseq_emmc_driver = { - .probe = mmc_pwrseq_emmc_probe, - .remove = mmc_pwrseq_emmc_remove, - .driver = { - .name = "pwrseq_emmc", - .of_match_table = mmc_pwrseq_emmc_of_match, - }, -}; - -module_platform_driver(mmc_pwrseq_emmc_driver); -MODULE_LICENSE("GPL v2"); diff --git a/drivers/mmc/core/pwrseq_sd8787.c b/drivers/mmc/core/pwrseq_sd8787.c deleted file mode 100644 index 68a826f1c0a1..000000000000 --- a/drivers/mmc/core/pwrseq_sd8787.c +++ /dev/null @@ -1,107 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* - * 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 - */ - -#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"); diff --git a/drivers/mmc/core/pwrseq_simple.c b/drivers/mmc/core/pwrseq_simple.c deleted file mode 100644 index ea4d3670560e..000000000000 --- a/drivers/mmc/core/pwrseq_simple.c +++ /dev/null @@ -1,164 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * Copyright (C) 2014 Linaro Ltd - * - * Author: Ulf Hansson - * - * Simple MMC power sequence management - */ -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include - -#include "pwrseq.h" - -struct mmc_pwrseq_simple { - struct mmc_pwrseq pwrseq; - bool clk_enabled; - u32 post_power_on_delay_ms; - u32 power_off_delay_us; - struct clk *ext_clk; - struct gpio_descs *reset_gpios; -}; - -#define to_pwrseq_simple(p) container_of(p, struct mmc_pwrseq_simple, pwrseq) - -static void mmc_pwrseq_simple_set_gpios_value(struct mmc_pwrseq_simple *pwrseq, - int value) -{ - struct gpio_descs *reset_gpios = pwrseq->reset_gpios; - - if (!IS_ERR(reset_gpios)) { - unsigned long *values; - int nvalues = reset_gpios->ndescs; - - values = bitmap_alloc(nvalues, GFP_KERNEL); - if (!values) - return; - - if (value) - bitmap_fill(values, nvalues); - else - bitmap_zero(values, nvalues); - - gpiod_set_array_value_cansleep(nvalues, reset_gpios->desc, - reset_gpios->info, values); - - kfree(values); - } -} - -static void mmc_pwrseq_simple_pre_power_on(struct mmc_host *host) -{ - struct mmc_pwrseq_simple *pwrseq = to_pwrseq_simple(host->pwrseq); - - if (!IS_ERR(pwrseq->ext_clk) && !pwrseq->clk_enabled) { - clk_prepare_enable(pwrseq->ext_clk); - pwrseq->clk_enabled = true; - } - - mmc_pwrseq_simple_set_gpios_value(pwrseq, 1); -} - -static void mmc_pwrseq_simple_post_power_on(struct mmc_host *host) -{ - struct mmc_pwrseq_simple *pwrseq = to_pwrseq_simple(host->pwrseq); - - mmc_pwrseq_simple_set_gpios_value(pwrseq, 0); - - if (pwrseq->post_power_on_delay_ms) - msleep(pwrseq->post_power_on_delay_ms); -} - -static void mmc_pwrseq_simple_power_off(struct mmc_host *host) -{ - struct mmc_pwrseq_simple *pwrseq = to_pwrseq_simple(host->pwrseq); - - mmc_pwrseq_simple_set_gpios_value(pwrseq, 1); - - if (pwrseq->power_off_delay_us) - usleep_range(pwrseq->power_off_delay_us, - 2 * pwrseq->power_off_delay_us); - - if (!IS_ERR(pwrseq->ext_clk) && pwrseq->clk_enabled) { - clk_disable_unprepare(pwrseq->ext_clk); - pwrseq->clk_enabled = false; - } -} - -static const struct mmc_pwrseq_ops mmc_pwrseq_simple_ops = { - .pre_power_on = mmc_pwrseq_simple_pre_power_on, - .post_power_on = mmc_pwrseq_simple_post_power_on, - .power_off = mmc_pwrseq_simple_power_off, -}; - -static const struct of_device_id mmc_pwrseq_simple_of_match[] = { - { .compatible = "mmc-pwrseq-simple",}, - {/* sentinel */}, -}; -MODULE_DEVICE_TABLE(of, mmc_pwrseq_simple_of_match); - -static int mmc_pwrseq_simple_probe(struct platform_device *pdev) -{ - struct mmc_pwrseq_simple *pwrseq; - struct device *dev = &pdev->dev; - - pwrseq = devm_kzalloc(dev, sizeof(*pwrseq), GFP_KERNEL); - if (!pwrseq) - return -ENOMEM; - - pwrseq->ext_clk = devm_clk_get(dev, "ext_clock"); - if (IS_ERR(pwrseq->ext_clk) && PTR_ERR(pwrseq->ext_clk) != -ENOENT) - return PTR_ERR(pwrseq->ext_clk); - - pwrseq->reset_gpios = devm_gpiod_get_array(dev, "reset", - GPIOD_OUT_HIGH); - if (IS_ERR(pwrseq->reset_gpios) && - PTR_ERR(pwrseq->reset_gpios) != -ENOENT && - PTR_ERR(pwrseq->reset_gpios) != -ENOSYS) { - return PTR_ERR(pwrseq->reset_gpios); - } - - device_property_read_u32(dev, "post-power-on-delay-ms", - &pwrseq->post_power_on_delay_ms); - device_property_read_u32(dev, "power-off-delay-us", - &pwrseq->power_off_delay_us); - - pwrseq->pwrseq.dev = dev; - pwrseq->pwrseq.ops = &mmc_pwrseq_simple_ops; - pwrseq->pwrseq.owner = THIS_MODULE; - platform_set_drvdata(pdev, pwrseq); - - return mmc_pwrseq_register(&pwrseq->pwrseq); -} - -static int mmc_pwrseq_simple_remove(struct platform_device *pdev) -{ - struct mmc_pwrseq_simple *pwrseq = platform_get_drvdata(pdev); - - mmc_pwrseq_unregister(&pwrseq->pwrseq); - - return 0; -} - -static struct platform_driver mmc_pwrseq_simple_driver = { - .probe = mmc_pwrseq_simple_probe, - .remove = mmc_pwrseq_simple_remove, - .driver = { - .name = "pwrseq_simple", - .of_match_table = mmc_pwrseq_simple_of_match, - }, -}; - -module_platform_driver(mmc_pwrseq_simple_driver); -MODULE_LICENSE("GPL v2"); diff --git a/drivers/power/pwrseq/Kconfig b/drivers/power/pwrseq/Kconfig index 8904ec9ed541..36339a456b03 100644 --- a/drivers/power/pwrseq/Kconfig +++ b/drivers/power/pwrseq/Kconfig @@ -8,4 +8,36 @@ menuconfig PWRSEQ if PWRSEQ +config PWRSEQ_EMMC + tristate "HW reset support for eMMC" + default y + depends on OF + help + This selects Hardware reset support aka pwrseq-emmc for eMMC + devices. By default this option is set to y. + + 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 + 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" + default y + depends on OF + help + This selects simple hardware reset support aka pwrseq-simple. + By default this option is set to y. + + This driver can also be built as a module. If so, the module + will be called pwrseq_simple. + endif diff --git a/drivers/power/pwrseq/Makefile b/drivers/power/pwrseq/Makefile index 108429ff6445..6f359d228843 100644 --- a/drivers/power/pwrseq/Makefile +++ b/drivers/power/pwrseq/Makefile @@ -4,3 +4,7 @@ # obj-$(CONFIG_PWRSEQ) += core.o + +obj-$(CONFIG_PWRSEQ_EMMC) += pwrseq_emmc.o +obj-$(CONFIG_PWRSEQ_SD8787) += pwrseq_sd8787.o +obj-$(CONFIG_PWRSEQ_SIMPLE) += pwrseq_simple.o diff --git a/drivers/power/pwrseq/pwrseq_emmc.c b/drivers/power/pwrseq/pwrseq_emmc.c new file mode 100644 index 000000000000..4a2da837efd0 --- /dev/null +++ b/drivers/power/pwrseq/pwrseq_emmc.c @@ -0,0 +1,119 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2015, Samsung Electronics Co., Ltd. + * + * Author: Marek Szyprowski + * + * Simple eMMC hardware reset provider + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct pwrseq_emmc { + struct notifier_block reset_nb; + struct gpio_desc *reset_gpio; +}; + +static void pwrseq_ereset(struct pwrseq *pwrseq) +{ + struct pwrseq_emmc *pwrseq_emmc = pwrseq_get_data(pwrseq); + + gpiod_set_value_cansleep(pwrseq_emmc->reset_gpio, 1); + udelay(1); + gpiod_set_value_cansleep(pwrseq_emmc->reset_gpio, 0); + udelay(200); +} + +static int pwrseq_ereset_nb(struct notifier_block *this, + unsigned long mode, void *cmd) +{ + struct pwrseq_emmc *pwrseq_emmc = container_of(this, + struct pwrseq_emmc, reset_nb); + gpiod_set_value(pwrseq_emmc->reset_gpio, 1); + udelay(1); + gpiod_set_value(pwrseq_emmc->reset_gpio, 0); + udelay(200); + + return NOTIFY_DONE; +} + +static const struct pwrseq_ops pwrseq_eops = { + .reset = pwrseq_ereset, +}; + +static int pwrseq_eprobe(struct platform_device *pdev) +{ + struct pwrseq_emmc *pwrseq_emmc; + struct pwrseq *pwrseq; + struct pwrseq_provider *provider; + struct device *dev = &pdev->dev; + + pwrseq_emmc = devm_kzalloc(dev, sizeof(*pwrseq_emmc), GFP_KERNEL); + if (!pwrseq_emmc) + return -ENOMEM; + + pwrseq_emmc->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW); + if (IS_ERR(pwrseq_emmc->reset_gpio)) + return PTR_ERR(pwrseq_emmc->reset_gpio); + + if (!gpiod_cansleep(pwrseq_emmc->reset_gpio)) { + /* + * register reset handler to ensure emmc reset also from + * emergency_reboot(), priority 255 is the highest priority + * so it will be executed before any system reboot handler. + */ + pwrseq_emmc->reset_nb.notifier_call = pwrseq_ereset_nb; + pwrseq_emmc->reset_nb.priority = 255; + register_restart_handler(&pwrseq_emmc->reset_nb); + } else { + dev_notice(dev, "EMMC reset pin tied to a sleepy GPIO driver; reset on emergency-reboot disabled\n"); + } + + platform_set_drvdata(pdev, pwrseq_emmc); + + pwrseq = devm_pwrseq_create(dev, &pwrseq_eops, pwrseq_emmc); + if (IS_ERR(pwrseq)) + return PTR_ERR(pwrseq); + + provider = devm_of_pwrseq_provider_register(dev, of_pwrseq_xlate_single, pwrseq); + + return PTR_ERR_OR_ZERO(provider); +} + +static int pwrseq_eremove(struct platform_device *pdev) +{ + struct pwrseq_emmc *pwrseq_emmc = platform_get_drvdata(pdev); + + unregister_restart_handler(&pwrseq_emmc->reset_nb); + + return 0; +} + +static const struct of_device_id pwrseq_eof_match[] = { + { .compatible = "mmc-pwrseq-emmc",}, + {/* sentinel */}, +}; + +MODULE_DEVICE_TABLE(of, pwrseq_eof_match); + +static struct platform_driver pwrseq_edriver = { + .probe = pwrseq_eprobe, + .remove = pwrseq_eremove, + .driver = { + .name = "pwrseq_emmc", + .of_match_table = pwrseq_eof_match, + }, +}; + +module_platform_driver(pwrseq_edriver); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/power/pwrseq/pwrseq_sd8787.c b/drivers/power/pwrseq/pwrseq_sd8787.c new file mode 100644 index 000000000000..c5d6c639380f --- /dev/null +++ b/drivers/power/pwrseq/pwrseq_sd8787.c @@ -0,0 +1,98 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * pwrseq_sd8787.c - power sequence support for Marvell SD8787 BT + Wifi chip + * + * Copyright (C) 2016 Matt Ranostay + * + * Based on the original work pwrseq_sd8787.c + * Copyright (C) 2014 Linaro Ltd + * Author: Ulf Hansson + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +struct pwrseq_sd8787 { + struct gpio_desc *reset_gpio; + struct gpio_desc *pwrdn_gpio; +}; + +static int pwrseq_sd8787_pre_power_on(struct pwrseq *pwrseq) +{ + struct pwrseq_sd8787 *pwrseq_sd8787 = pwrseq_get_data(pwrseq); + + gpiod_set_value_cansleep(pwrseq_sd8787->reset_gpio, 1); + + msleep(300); + gpiod_set_value_cansleep(pwrseq_sd8787->pwrdn_gpio, 1); + + return 0; +} + +static void pwrseq_sd8787_power_off(struct pwrseq *pwrseq) +{ + struct pwrseq_sd8787 *pwrseq_sd8787 = pwrseq_get_data(pwrseq); + + gpiod_set_value_cansleep(pwrseq_sd8787->pwrdn_gpio, 0); + gpiod_set_value_cansleep(pwrseq_sd8787->reset_gpio, 0); +} + +static const struct pwrseq_ops pwrseq_sd8787_ops = { + .pre_power_on = pwrseq_sd8787_pre_power_on, + .power_off = pwrseq_sd8787_power_off, +}; + +static const struct of_device_id pwrseq_sd8787_of_match[] = { + { .compatible = "mmc-pwrseq-sd8787",}, + {/* sentinel */}, +}; +MODULE_DEVICE_TABLE(of, pwrseq_sd8787_of_match); + +static int pwrseq_sd8787_probe(struct platform_device *pdev) +{ + struct pwrseq_sd8787 *pwrseq_sd8787; + struct pwrseq *pwrseq; + struct pwrseq_provider *provider; + struct device *dev = &pdev->dev; + + pwrseq_sd8787 = devm_kzalloc(dev, sizeof(*pwrseq_sd8787), GFP_KERNEL); + if (!pwrseq_sd8787) + return -ENOMEM; + + pwrseq_sd8787->pwrdn_gpio = devm_gpiod_get(dev, "powerdown", GPIOD_OUT_LOW); + if (IS_ERR(pwrseq_sd8787->pwrdn_gpio)) + return PTR_ERR(pwrseq_sd8787->pwrdn_gpio); + + pwrseq_sd8787->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW); + if (IS_ERR(pwrseq_sd8787->reset_gpio)) + return PTR_ERR(pwrseq_sd8787->reset_gpio); + + pwrseq = devm_pwrseq_create(dev, &pwrseq_sd8787_ops, pwrseq_sd8787); + if (IS_ERR(pwrseq)) + return PTR_ERR(pwrseq); + + provider = devm_of_pwrseq_provider_register(dev, of_pwrseq_xlate_single, pwrseq); + + return PTR_ERR_OR_ZERO(provider); +} + +static struct platform_driver pwrseq_sd8787_driver = { + .probe = pwrseq_sd8787_probe, + .driver = { + .name = "pwrseq_sd8787", + .of_match_table = pwrseq_sd8787_of_match, + }, +}; + +module_platform_driver(pwrseq_sd8787_driver); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/power/pwrseq/pwrseq_simple.c b/drivers/power/pwrseq/pwrseq_simple.c new file mode 100644 index 000000000000..f8d6e6e077df --- /dev/null +++ b/drivers/power/pwrseq/pwrseq_simple.c @@ -0,0 +1,160 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2014 Linaro Ltd + * + * Author: Ulf Hansson + * + * Simple MMC power sequence management + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct pwrseq_simple { + bool clk_enabled; + u32 post_power_on_delay_ms; + u32 power_off_delay_us; + struct clk *ext_clk; + struct gpio_descs *reset_gpios; +}; + +static int pwrseq_simple_set_gpios_value(struct pwrseq_simple *pwrseq_simple, + int value) +{ + struct gpio_descs *reset_gpios = pwrseq_simple->reset_gpios; + unsigned long *values; + int nvalues; + int ret; + + if (IS_ERR(reset_gpios)) + return PTR_ERR(reset_gpios); + + nvalues = reset_gpios->ndescs; + + values = bitmap_alloc(nvalues, GFP_KERNEL); + if (!values) + return -ENOMEM; + + if (value) + bitmap_fill(values, nvalues); + else + bitmap_zero(values, nvalues); + + ret = gpiod_set_array_value_cansleep(nvalues, reset_gpios->desc, + reset_gpios->info, values); + kfree(values); + + return ret; +} + +static int pwrseq_simple_pre_power_on(struct pwrseq *pwrseq) +{ + struct pwrseq_simple *pwrseq_simple = pwrseq_get_data(pwrseq); + + if (!IS_ERR(pwrseq_simple->ext_clk) && !pwrseq_simple->clk_enabled) { + clk_prepare_enable(pwrseq_simple->ext_clk); + pwrseq_simple->clk_enabled = true; + } + + return pwrseq_simple_set_gpios_value(pwrseq_simple, 1); +} + +static int pwrseq_simple_power_on(struct pwrseq *pwrseq) +{ + struct pwrseq_simple *pwrseq_simple = pwrseq_get_data(pwrseq); + int ret; + + ret = pwrseq_simple_set_gpios_value(pwrseq_simple, 0); + if (ret) + return ret; + + if (pwrseq_simple->post_power_on_delay_ms) + msleep(pwrseq_simple->post_power_on_delay_ms); + + return 0; +} + +static void pwrseq_simple_power_off(struct pwrseq *pwrseq) +{ + struct pwrseq_simple *pwrseq_simple = pwrseq_get_data(pwrseq); + + pwrseq_simple_set_gpios_value(pwrseq_simple, 1); + + if (pwrseq_simple->power_off_delay_us) + usleep_range(pwrseq_simple->power_off_delay_us, + 2 * pwrseq_simple->power_off_delay_us); + + if (!IS_ERR(pwrseq_simple->ext_clk) && pwrseq_simple->clk_enabled) { + clk_disable_unprepare(pwrseq_simple->ext_clk); + pwrseq_simple->clk_enabled = false; + } +} + +static const struct pwrseq_ops pwrseq_simple_ops = { + .pre_power_on = pwrseq_simple_pre_power_on, + .power_on = pwrseq_simple_power_on, + .power_off = pwrseq_simple_power_off, +}; + +static const struct of_device_id pwrseq_simple_of_match[] = { + { .compatible = "mmc-pwrseq-simple",}, /* MMC-specific compatible */ + {/* sentinel */}, +}; +MODULE_DEVICE_TABLE(of, pwrseq_simple_of_match); + +static int pwrseq_simple_probe(struct platform_device *pdev) +{ + struct pwrseq_simple *pwrseq_simple; + struct pwrseq *pwrseq; + struct pwrseq_provider *provider; + struct device *dev = &pdev->dev; + + pwrseq_simple = devm_kzalloc(dev, sizeof(*pwrseq_simple), GFP_KERNEL); + if (!pwrseq_simple) + return -ENOMEM; + + pwrseq_simple->ext_clk = devm_clk_get(dev, "ext_clock"); + if (IS_ERR(pwrseq_simple->ext_clk) && PTR_ERR(pwrseq_simple->ext_clk) != -ENOENT) + return PTR_ERR(pwrseq_simple->ext_clk); + + pwrseq_simple->reset_gpios = devm_gpiod_get_array(dev, "reset", + GPIOD_OUT_HIGH); + if (IS_ERR(pwrseq_simple->reset_gpios) && + PTR_ERR(pwrseq_simple->reset_gpios) != -ENOENT && + PTR_ERR(pwrseq_simple->reset_gpios) != -ENOSYS) { + return PTR_ERR(pwrseq_simple->reset_gpios); + } + + device_property_read_u32(dev, "post-power-on-delay-ms", + &pwrseq_simple->post_power_on_delay_ms); + device_property_read_u32(dev, "power-off-delay-us", + &pwrseq_simple->power_off_delay_us); + + pwrseq = devm_pwrseq_create(dev, &pwrseq_simple_ops, pwrseq_simple); + if (IS_ERR(pwrseq)) + return PTR_ERR(pwrseq); + + provider = devm_of_pwrseq_provider_register(dev, of_pwrseq_xlate_single, pwrseq); + + return PTR_ERR_OR_ZERO(provider); +} + +static struct platform_driver pwrseq_simple_driver = { + .probe = pwrseq_simple_probe, + .driver = { + .name = "pwrseq_simple", + .of_match_table = pwrseq_simple_of_match, + }, +}; + +module_platform_driver(pwrseq_simple_driver); +MODULE_LICENSE("GPL v2");