From patchwork Thu Feb 11 11:50:01 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Benjamin Gaignard X-Patchwork-Id: 12082961 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=-17.3 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, 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 D70E4C433DB for ; Thu, 11 Feb 2021 11:52:21 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 8161364E87 for ; Thu, 11 Feb 2021 11:52:21 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8161364E87 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=collabora.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-Id:Date: Subject:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=CRlrEaZd7ce8qtZEpF/j9ikP38nVyBonIL5pItb2wwM=; b=nlY1uhRUlxoKDIH4KnsLNJBCV b/RcRxKHPHO4f8z44pBjtoxFN92QPeGS6o3VqJO+eap017kDJM57EldVR2ichTvrO6dBKTo2//CPa TBI0sVLaN5/dwU7I30EFf5cYDgzMRxV3bxbz3dOODfRpZl2c738EY9Mp4WDUVq9mUFxh5QmtU19Zo HPybBkh06M8s7rzGsL2YMuF0uAPe5MdgTN+DhXLz05kQl/KgDlilH4h8HeQXzeRr8e6OAo8Ud8/IO LPv/MVsi04zhd5cRoEDREXb9nWjuBK9D7Q81/oJog1UX5ZprZJS9+4ysCnwpAdzeCcOj6j0jm6y2o Fvom2rl2A==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1lAAUN-0001Vy-Ju; Thu, 11 Feb 2021 11:50:27 +0000 Received: from bhuna.collabora.co.uk ([2a00:1098:0:82:1000:25:2eeb:e3e3]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1lAAUE-0001RJ-0q; Thu, 11 Feb 2021 11:50:19 +0000 Received: from localhost.localdomain (unknown [IPv6:2a01:e0a:4cb:a870:94f7:2542:9eb3:b5ba]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: benjamin.gaignard) by bhuna.collabora.co.uk (Postfix) with ESMTPSA id 591CD1F45971; Thu, 11 Feb 2021 11:50:16 +0000 (GMT) From: Benjamin Gaignard To: p.zabel@pengutronix.de, robh+dt@kernel.org, shawnguo@kernel.org, s.hauer@pengutronix.de, festevam@gmail.com, ezequiel@collabora.com, mchehab@kernel.org, gregkh@linuxfoundation.org Subject: [PATCH 2/4] reset: Add reset driver for IMX8MQ VPU block Date: Thu, 11 Feb 2021 12:50:01 +0100 Message-Id: <20210211115003.249367-3-benjamin.gaignard@collabora.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210211115003.249367-1-benjamin.gaignard@collabora.com> References: <20210211115003.249367-1-benjamin.gaignard@collabora.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210211_065018_320130_D43FF3DA X-CRM114-Status: GOOD ( 21.33 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devel@driverdev.osuosl.org, devicetree@vger.kernel.org, benjamin.gaignard@collabora.com, linux-kernel@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-imx@nxp.com, kernel@pengutronix.de, kernel@collabora.com, linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org IMX8MQ SoC got a dedicated hardware block to reset the video processor units (G1 and G2). Signed-off-by: Benjamin Gaignard --- drivers/reset/Kconfig | 8 ++ drivers/reset/Makefile | 1 + drivers/reset/reset-imx8mq-vpu.c | 169 +++++++++++++++++++++++++++++++ 3 files changed, 178 insertions(+) create mode 100644 drivers/reset/reset-imx8mq-vpu.c diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig index 71ab75a46491..fa95380b271a 100644 --- a/drivers/reset/Kconfig +++ b/drivers/reset/Kconfig @@ -80,6 +80,14 @@ config RESET_IMX7 help This enables the reset controller driver for i.MX7 SoCs. +config RESET_VPU_IMX8MQ + tristate "i.MX8MQ VPU Reset Driver" + depends on HAS_IOMEM + depends on (ARM64 && ARCH_MXC) || COMPILE_TEST + select MFD_SYSCON + help + This enables the VPU reset controller driver for i.MX8MQ SoCs. + config RESET_INTEL_GW bool "Intel Reset Controller Driver" depends on OF && HAS_IOMEM diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile index 1054123fd187..6007e0cdfc05 100644 --- a/drivers/reset/Makefile +++ b/drivers/reset/Makefile @@ -12,6 +12,7 @@ obj-$(CONFIG_RESET_BRCMSTB) += reset-brcmstb.o obj-$(CONFIG_RESET_BRCMSTB_RESCAL) += reset-brcmstb-rescal.o obj-$(CONFIG_RESET_HSDK) += reset-hsdk.o obj-$(CONFIG_RESET_IMX7) += reset-imx7.o +obj-$(CONFIG_RESET_VPU_IMX8MQ) += reset-imx8mq-vpu.o obj-$(CONFIG_RESET_INTEL_GW) += reset-intel-gw.o obj-$(CONFIG_RESET_LANTIQ) += reset-lantiq.o obj-$(CONFIG_RESET_LPC18XX) += reset-lpc18xx.o diff --git a/drivers/reset/reset-imx8mq-vpu.c b/drivers/reset/reset-imx8mq-vpu.c new file mode 100644 index 000000000000..14c589f19266 --- /dev/null +++ b/drivers/reset/reset-imx8mq-vpu.c @@ -0,0 +1,169 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2021, Collabora + * + * i.MX8MQ VPU Reset Controller driver + * + * Author: Benjamin Gaignard + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define CTRL_SOFT_RESET 0x00 +#define RESET_G1 ((u32)BIT(1)) +#define RESET_G2 ((u32)BIT(0)) + +#define CTRL_ENABLE 0x04 +#define ENABLE_G1 BIT(1) +#define ENABLE_G2 BIT(0) + +#define CTRL_G1_DEC_FUSE 0x08 +#define CTRL_G1_PP_FUSE 0x0c +#define CTRL_G2_DEC_FUSE 0x10 + +struct imx8mq_vpu_reset { + struct reset_controller_dev rcdev; + struct regmap *regmap; + struct clk_bulk_data *clocks; + int num_clocks; + struct device *dev; +}; + +static inline struct imx8mq_vpu_reset *to_imx8mq_vpu_reset(struct reset_controller_dev *rcdev) +{ + return container_of(rcdev, struct imx8mq_vpu_reset, rcdev); +} + +static int imx8mq_vpu_reset_assert(struct reset_controller_dev *rcdev, + unsigned long id) +{ + struct imx8mq_vpu_reset *reset = to_imx8mq_vpu_reset(rcdev); + int ret = -EINVAL; + + ret = clk_bulk_prepare_enable(reset->num_clocks, reset->clocks); + if (ret) { + dev_err(reset->dev, "Failed to prepare clocks\n"); + return ret; + } + + switch (id) { + case IMX8MQ_RESET_VPU_RESET_G1: + ret = regmap_update_bits(reset->regmap, CTRL_SOFT_RESET, RESET_G1, ~RESET_G1); + ret |= regmap_update_bits(reset->regmap, CTRL_ENABLE, ENABLE_G1, ENABLE_G1); + break; + case IMX8MQ_RESET_VPU_RESET_G2: + ret = regmap_update_bits(reset->regmap, CTRL_SOFT_RESET, RESET_G2, ~RESET_G2); + ret |= regmap_update_bits(reset->regmap, CTRL_ENABLE, ENABLE_G2, ENABLE_G2); + break; + } + + /* Set values of the fuse registers */ + ret |= regmap_write(reset->regmap, CTRL_G1_DEC_FUSE, 0xffffffff); + ret |= regmap_write(reset->regmap, CTRL_G1_PP_FUSE, 0xffffffff); + ret |= regmap_write(reset->regmap, CTRL_G2_DEC_FUSE, 0xffffffff); + + clk_bulk_disable_unprepare(reset->num_clocks, reset->clocks); + + return ret; +} + +static int imx8mq_vpu_reset_deassert(struct reset_controller_dev *rcdev, + unsigned long id) +{ + struct imx8mq_vpu_reset *reset = to_imx8mq_vpu_reset(rcdev); + int ret; + + ret = clk_bulk_prepare_enable(reset->num_clocks, reset->clocks); + if (ret) { + dev_err(reset->dev, "Failed to prepare clocks\n"); + return ret; + } + + switch (id) { + case IMX8MQ_RESET_VPU_RESET_G1: + return regmap_update_bits(reset->regmap, CTRL_SOFT_RESET, RESET_G1, RESET_G1); + case IMX8MQ_RESET_VPU_RESET_G2: + return regmap_update_bits(reset->regmap, CTRL_SOFT_RESET, RESET_G2, RESET_G2); + } + + clk_bulk_disable_unprepare(reset->num_clocks, reset->clocks); + + return -EINVAL; +} + +static int imx8mq_vpu_reset_dev(struct reset_controller_dev *rcdev, + unsigned long id) +{ + int ret; + + ret = imx8mq_vpu_reset_assert(rcdev, id); + if (ret) + return ret; + + udelay(2); + + return imx8mq_vpu_reset_deassert(rcdev, id); +} + +static const struct reset_control_ops imx8mq_vpu_reset_ops = { + .reset = imx8mq_vpu_reset_dev, + .assert = imx8mq_vpu_reset_assert, + .deassert = imx8mq_vpu_reset_deassert, +}; + +static int imx8mq_vpu_reset_probe(struct platform_device *pdev) +{ + struct imx8mq_vpu_reset *reset; + struct device *dev = &pdev->dev; + struct regmap_config config = { .name = "vpu-reset" }; + + reset = devm_kzalloc(dev, sizeof(*reset), GFP_KERNEL); + if (!reset) + return -ENOMEM; + + reset->regmap = device_node_to_regmap(dev->of_node); + if (IS_ERR(reset->regmap)) { + dev_err(dev, "Unable to get imx8mq-vpu-reset regmap"); + return PTR_ERR(reset->regmap); + } + regmap_attach_dev(dev, reset->regmap, &config); + + reset->num_clocks = devm_clk_bulk_get_all(dev, &reset->clocks); + if (!reset->num_clocks) + return -EINVAL; + + reset->rcdev.owner = THIS_MODULE; + reset->rcdev.nr_resets = 2; + reset->rcdev.ops = &imx8mq_vpu_reset_ops; + reset->rcdev.of_node = dev->of_node; + reset->dev = dev; + + return devm_reset_controller_register(dev, &reset->rcdev); +} + +static const struct of_device_id imx8mq_vpu_reset_dt_ids[] = { + { .compatible = "fsl,imx8mq-vpu-reset",}, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, imx8mq_vpu_reset_dt_ids); + +static struct platform_driver imx8mq_vpu_reset_driver = { + .probe = imx8mq_vpu_reset_probe, + .driver = { + .name = KBUILD_MODNAME, + .of_match_table = imx8mq_vpu_reset_dt_ids, + }, +}; +module_platform_driver(imx8mq_vpu_reset_driver); + +MODULE_AUTHOR("Benjamin Gaignard "); +MODULE_DESCRIPTION("NXP i.MX8MQ VPU reset driver"); +MODULE_LICENSE("GPL v2");