From patchwork Wed Nov 20 06:32:56 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Friday Yang X-Patchwork-Id: 13880741 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C7D31D6E2CA for ; Wed, 20 Nov 2024 06:36:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Type: Content-Transfer-Encoding:MIME-Version:References:In-Reply-To:Message-ID:Date :Subject:CC:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=qXs8kYOZriK1GsWYowwWBlQ8tNmmdH5RpvvE2Nxubxw=; b=KUk3UZS+IZ/gMBVJoLqDt7yTDz 1BoGhRV/M1TI0+9lDWgl4uCobgiA8v0eu0lQyPK4dg2arW6fClbnejJmtmvbM+3nlk9LaAi6D9doG whjYQDUPFUoIgqzVyZHuQ5RdxXQfJlSLrnlXhB1lsY3E9LmX3x4gusNx2B7dDwVcvvcLR6OuDRiUt 4uVoC8JYKs+2XiH/laPF+Z43eoykJtolevfcMRpdNYptFHb29/YYhCeSZHX6jzW+PCwd6oTWFe+r5 9WkPMxOwJ2E+fGw9stRr99+QAjKQ/7NJvTVkUSNIqfkuqbiB7MoTyR2GIoBKbVBjFRw2GjIVxGt5p XKejaZhA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tDeJt-0000000EViO-290K; Wed, 20 Nov 2024 06:36:09 +0000 Received: from mailgw01.mediatek.com ([216.200.240.184]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tDeHJ-0000000EVCl-0dgM; Wed, 20 Nov 2024 06:33:30 +0000 X-UUID: 5818af16a70911ef82ff63e91e7eb18c-20241119 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Type:Content-Transfer-Encoding:MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:CC:To:From; bh=qXs8kYOZriK1GsWYowwWBlQ8tNmmdH5RpvvE2Nxubxw=; b=dkuMiVFy4SWRHKJUiOPvJ5GPIetAhbCeGjvO2MWQyb2P8fkKSR3tg0P2sHDSdMN1WJwcZhlL1fWYW9WbXFvr4FvOf5oKDkQ7jRV/N5WAISEbcS46MPtssAwNHo/4QVRlvx/aFrWw82i1hH3azqDWFXv6+5Uuy2Jritum52/vM5A=; X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.44,REQID:7479fd2d-fc49-4744-9693-3c7c160a6603,IP:0,U RL:0,TC:0,Content:-20,EDM:0,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTIO N:release,TS:-20 X-CID-META: VersionHash:464815b,CLOUDID:dce580a0-f395-4dfc-8188-ce2682df7fd8,B ulkID:nil,BulkQuantity:0,Recheck:0,SF:81|82|102,TC:nil,Content:1,EDM:-3,IP :nil,URL:11|1,File:nil,RT:nil,Bulk:nil,QS:nil,BEC:nil,COL:0,OSI:0,OSA:0,AV :0,LES:1,SPR:NO,DKR:0,DKP:0,BRR:0,BRE:0,ARC:0 X-CID-BVR: 0,NGT X-CID-BAS: 0,NGT,0,_ X-CID-FACTOR: TF_CID_SPAM_SNR,TF_CID_SPAM_ULN X-UUID: 5818af16a70911ef82ff63e91e7eb18c-20241119 Received: from mtkmbs09n2.mediatek.inc [(172.21.101.94)] by mailgw01.mediatek.com (envelope-from ) (musrelay.mediatek.com ESMTP with TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384 256/256) with ESMTP id 999039225; Tue, 19 Nov 2024 23:33:24 -0700 Received: from mtkmbs11n1.mediatek.inc (172.21.101.185) by MTKMBS09N1.mediatek.inc (172.21.101.35) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.26; Wed, 20 Nov 2024 14:33:21 +0800 Received: from mhfsdcap04.gcn.mediatek.inc (10.17.3.154) by mtkmbs11n1.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.1118.26 via Frontend Transport; Wed, 20 Nov 2024 14:33:21 +0800 From: Friday Yang To: Philipp Zabel , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Matthias Brugger , AngeloGioacchino Del Regno , Friday Yang CC: , , , , Subject: [PATCH v2 2/2] reset: mediatek: Add reset controller driver for SMI Date: Wed, 20 Nov 2024 14:32:56 +0800 Message-ID: <20241120063305.8135-3-friday.yang@mediatek.com> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20241120063305.8135-1-friday.yang@mediatek.com> References: <20241120063305.8135-1-friday.yang@mediatek.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241119_223329_195879_689F7CC3 X-CRM114-Status: GOOD ( 22.69 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: "Friday Yang" In order to avoid the bus glitch issue, add a reset-controller driver for performing reset management of SMI LARBs on MediaTek platform. Signed-off-by: Friday Yang --- drivers/reset/Kconfig | 9 ++ drivers/reset/Makefile | 1 + drivers/reset/reset-mediatek-smi.c | 156 +++++++++++++++++++++++++++++ 3 files changed, 166 insertions(+) create mode 100644 drivers/reset/reset-mediatek-smi.c -- 2.46.0 diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig index 5b3abb6db248..07e606e530fc 100644 --- a/drivers/reset/Kconfig +++ b/drivers/reset/Kconfig @@ -153,6 +153,15 @@ config RESET_MCHP_SPARX5 help This driver supports switch core reset for the Microchip Sparx5 SoC. +config RESET_MTK_SMI + bool "MediaTek SMI Reset Driver" + depends on MTK_SMI || COMPILE_TEST + help + This option enables the reset controller driver for MediaTek SMI. + This reset driver is responsible for managing the reset signals + for SMI larbs. Say Y if you want to control reset signals for + MediaTek SMI larbs. Otherwise, say N. + config RESET_NPCM bool "NPCM BMC Reset Driver" if COMPILE_TEST default ARCH_NPCM diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile index 677c4d1e2632..1f5ba5696872 100644 --- a/drivers/reset/Makefile +++ b/drivers/reset/Makefile @@ -22,6 +22,7 @@ obj-$(CONFIG_RESET_K210) += reset-k210.o obj-$(CONFIG_RESET_LANTIQ) += reset-lantiq.o obj-$(CONFIG_RESET_LPC18XX) += reset-lpc18xx.o obj-$(CONFIG_RESET_MCHP_SPARX5) += reset-microchip-sparx5.o +obj-$(CONFIG_RESET_MTK_SMI) += reset-mediatek-smi.o obj-$(CONFIG_RESET_NPCM) += reset-npcm.o obj-$(CONFIG_RESET_NUVOTON_MA35D1) += reset-ma35d1.o obj-$(CONFIG_RESET_PISTACHIO) += reset-pistachio.o diff --git a/drivers/reset/reset-mediatek-smi.c b/drivers/reset/reset-mediatek-smi.c new file mode 100644 index 000000000000..0a2ffd9db670 --- /dev/null +++ b/drivers/reset/reset-mediatek-smi.c @@ -0,0 +1,156 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Reset driver for MediaTek SMI module + * + * Copyright (C) 2024 MediaTek Inc. + */ + +#include +#include +#include +#include +#include +#include +#include + +#include + +#define to_mtk_smi_reset_data(_rcdev) \ + container_of(_rcdev, struct mtk_smi_reset_data, rcdev) + +struct mtk_smi_larb_reset { + unsigned int offset; + unsigned int value; +}; + +static const struct mtk_smi_larb_reset rst_signal_mt8188[] = { + [MT8188_SMI_RST_LARB10] = { 0xC, BIT(0) }, + [MT8188_SMI_RST_LARB11A] = { 0xC, BIT(0) }, + [MT8188_SMI_RST_LARB11C] = { 0xC, BIT(0) }, + [MT8188_SMI_RST_LARB12] = { 0xC, BIT(8) }, + [MT8188_SMI_RST_LARB11B] = { 0xC, BIT(0) }, + [MT8188_SMI_RST_LARB15] = { 0xC, BIT(0) }, + [MT8188_SMI_RST_LARB16B] = { 0xA0, BIT(4) }, + [MT8188_SMI_RST_LARB17B] = { 0xA0, BIT(4) }, + [MT8188_SMI_RST_LARB16A] = { 0xA0, BIT(4) }, + [MT8188_SMI_RST_LARB17A] = { 0xA0, BIT(4) }, +}; + +struct mtk_smi_larb_plat { + const struct mtk_smi_larb_reset *reset_signal; + const unsigned int larb_reset_nr; +}; + +struct mtk_smi_reset_data { + const struct mtk_smi_larb_plat *larb_plat; + struct reset_controller_dev rcdev; + void __iomem *base; +}; + +static const struct mtk_smi_larb_plat mtk_smi_larb_mt8188 = { + .reset_signal = rst_signal_mt8188, + .larb_reset_nr = ARRAY_SIZE(rst_signal_mt8188), +}; + +static int mtk_smi_larb_reset_assert(struct reset_controller_dev *rcdev, unsigned long id) +{ + struct mtk_smi_reset_data *data = to_mtk_smi_reset_data(rcdev); + const struct mtk_smi_larb_plat *larb_plat = data->larb_plat; + const struct mtk_smi_larb_reset *larb_rst = larb_plat->reset_signal + id; + unsigned int val, offset = larb_rst->offset; + void __iomem *base = data->base; + + val = readl(base + offset); + val |= larb_rst->value; + writel(val, base + offset); + + return 0; +} + +static int mtk_smi_larb_reset_deassert(struct reset_controller_dev *rcdev, unsigned long id) +{ + struct mtk_smi_reset_data *data = to_mtk_smi_reset_data(rcdev); + const struct mtk_smi_larb_plat *larb_plat = data->larb_plat; + const struct mtk_smi_larb_reset *larb_rst = larb_plat->reset_signal + id; + unsigned int val, offset = larb_rst->offset; + void __iomem *base = data->base; + + val = readl(base + offset); + val &= ~larb_rst->value; + writel(val, base + offset); + + return 0; +} + +static int mtk_smi_larb_reset(struct reset_controller_dev *rcdev, unsigned long id) +{ + mtk_smi_larb_reset_assert(rcdev, id); + + return mtk_smi_larb_reset_deassert(rcdev, id); +} + +static const struct reset_control_ops mtk_smi_reset_ops = { + .reset = mtk_smi_larb_reset, + .assert = mtk_smi_larb_reset_assert, + .deassert = mtk_smi_larb_reset_deassert, +}; + +static int mtk_smi_reset_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + const struct mtk_smi_larb_plat *larb_plat = of_device_get_match_data(dev); + struct device_node *np = dev->of_node, *reset_node; + struct mtk_smi_reset_data *data; + struct resource res; + void __iomem *base; + + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + reset_node = of_parse_phandle(np, "mediatek,larb-rst", 0); + if (!reset_node) + return -EINVAL; + + if (of_address_to_resource(reset_node, 0, &res)) { + of_node_put(reset_node); + return -EINVAL; + } + + base = devm_ioremap_resource(dev, &res); + if (IS_ERR(base)) { + of_node_put(reset_node); + return PTR_ERR(base); + } + + of_node_put(reset_node); + data->larb_plat = larb_plat; + data->base = base; + data->rcdev.owner = THIS_MODULE; + data->rcdev.ops = &mtk_smi_reset_ops; + data->rcdev.of_node = np; + data->rcdev.nr_resets = larb_plat->larb_reset_nr; + data->rcdev.dev = dev; + platform_set_drvdata(pdev, data); + + return devm_reset_controller_register(dev, &data->rcdev); +} + +static const struct of_device_id mtk_smi_larb_reset_of_match[] = { + { .compatible = "mediatek,mt8188-smi-reset", .data = &mtk_smi_larb_mt8188 }, + { }, +}; +MODULE_DEVICE_TABLE(of, mtk_smi_larb_reset_of_match); + +static struct platform_driver mtk_smi_reset_driver = { + .probe = mtk_smi_reset_probe, + .driver = { + .name = "mediatek-smi-reset", + .of_match_table = mtk_smi_larb_reset_of_match, + }, +}; +module_platform_driver(mtk_smi_reset_driver); + +MODULE_AUTHOR("Friday.Yang@mediatek.com"); +MODULE_DESCRIPTION("MediaTek SMI Reset Driver"); +MODULE_LICENSE("GPL");