From patchwork Tue Nov 28 07:28:18 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Weiyi Lu X-Patchwork-Id: 10078877 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id D860060353 for ; Tue, 28 Nov 2017 07:43:10 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B2DB328E78 for ; Tue, 28 Nov 2017 07:43:10 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id A629A291B8; Tue, 28 Nov 2017 07:43:10 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, RCVD_IN_DNSWL_MED, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id E2AB628E78 for ; Tue, 28 Nov 2017 07:43:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.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=DT2UDzcI8QSVcnhIpF9GTLYusSFL81+6tG3vwHtOFDA=; b=G2dIrU1VDzoEGd kn5k8ryXx7agmAh6vBo7Kf8euNEfUpeTB/l1CHsNJvaPCoJHM1bESGT9eW3C1VKcz8GJsiubpYSJV 1ZLHAVNw3uzlAjg0YM9ImwNAnLWbWD6vEIbG6a+lufrCyXb0bRtN1Jn/z5v5kMP72x6AubtWqHXTP 42W/EYNfTod2m9HeCvlqmZjCryLmCnHbPb3nCrAb1OlCFcxhaj4e1vQDoEyMw2Ykm68ZgiPo8Oxyg Xbq01fDQ924xs3sPlluuwTA8SNSoqYhgn9+jGp8/54Qq+BVMlXqKWyueTnqkaxIfQefjuirza4aMe wEpaHz5kKYrH6TMRdb3A==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1eJaXs-0002Au-Kg; Tue, 28 Nov 2017 07:43:08 +0000 Received: from [210.61.82.184] (helo=mailgw02.mediatek.com) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1eJaKl-0000Wp-IG; Tue, 28 Nov 2017 07:29:38 +0000 X-UUID: 128f9dbbb93b459eb2f0beab7641f648-20171128 Received: from mtkexhb02.mediatek.inc [(172.21.101.103)] by mailgw02.mediatek.com (envelope-from ) (mhqrelay.mediatek.com ESMTP with TLS) with ESMTP id 130628046; Tue, 28 Nov 2017 15:29:03 +0800 Received: from mtkcas07.mediatek.inc (172.21.101.84) by mtkmbs01n2.mediatek.inc (172.21.101.79) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Tue, 28 Nov 2017 15:29:02 +0800 Received: from mtkslt210.mediatek.inc (10.21.14.14) by mtkcas07.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1210.3 via Frontend Transport; Tue, 28 Nov 2017 15:29:02 +0800 From: Weiyi Lu To: Matthias Brugger , Stephen Boyd , Mike Turquette , Rob Herring Subject: [PATCH v7 2/6] soc: mediatek: extend bus protection API Date: Tue, 28 Nov 2017 15:28:18 +0800 Message-ID: <1511854102-23195-4-git-send-email-weiyi.lu@mediatek.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1511854102-23195-1-git-send-email-weiyi.lu@mediatek.com> References: <1511854102-23195-1-git-send-email-weiyi.lu@mediatek.com> MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20171127_232935_992822_A31B2BC4 X-CRM114-Status: GOOD ( 16.28 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: James Liao , Weiyi Lu , srv_heupstream@mediatek.com, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Fan Chen , linux-mediatek@lists.infradead.org, linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP MT2712 add "set/clear" bus control register to each control register set instead of providing only one "enable" control register, we could avoid the read-modify-write racing by declaring "bus_prot_reg_update" as "false" in scp_soc_data or declaring as "true" to use the legacy update method. By improving the mtk-infracfg bus protection implementation to support set/clear bus protection control method by IC configuration. Signed-off-by: Weiyi Lu --- drivers/soc/mediatek/mtk-infracfg.c | 26 ++++++++++++++++++++++---- drivers/soc/mediatek/mtk-scpsys.c | 28 ++++++++++++++++++++-------- include/linux/soc/mediatek/infracfg.h | 7 ++++--- 3 files changed, 46 insertions(+), 15 deletions(-) diff --git a/drivers/soc/mediatek/mtk-infracfg.c b/drivers/soc/mediatek/mtk-infracfg.c index dba3055..8c310de 100644 --- a/drivers/soc/mediatek/mtk-infracfg.c +++ b/drivers/soc/mediatek/mtk-infracfg.c @@ -19,23 +19,33 @@ #define INFRA_TOPAXI_PROTECTEN 0x0220 #define INFRA_TOPAXI_PROTECTSTA1 0x0228 +#define INFRA_TOPAXI_PROTECTEN_SET 0x0260 +#define INFRA_TOPAXI_PROTECTEN_CLR 0x0264 /** * mtk_infracfg_set_bus_protection - enable bus protection * @regmap: The infracfg regmap * @mask: The mask containing the protection bits to be enabled. + * @reg_update: The boolean flag determines to set the protection bits + * by regmap_update_bits with enable register(PROTECTEN) or + * by regmap_write with set register(PROTECTEN_SET). * * This function enables the bus protection bits for disabled power * domains so that the system does not hang when some unit accesses the * bus while in power down. */ -int mtk_infracfg_set_bus_protection(struct regmap *infracfg, u32 mask) +int mtk_infracfg_set_bus_protection(struct regmap *infracfg, u32 mask, + bool reg_update) { unsigned long expired; u32 val; int ret; - regmap_update_bits(infracfg, INFRA_TOPAXI_PROTECTEN, mask, mask); + if (reg_update) + regmap_update_bits(infracfg, INFRA_TOPAXI_PROTECTEN, mask, + mask); + else + regmap_write(infracfg, INFRA_TOPAXI_PROTECTEN_SET, mask); expired = jiffies + HZ; @@ -59,16 +69,24 @@ int mtk_infracfg_set_bus_protection(struct regmap *infracfg, u32 mask) * mtk_infracfg_clear_bus_protection - disable bus protection * @regmap: The infracfg regmap * @mask: The mask containing the protection bits to be disabled. + * @reg_update: The boolean flag determines to clear the protection bits + * by regmap_update_bits with enable register(PROTECTEN) or + * by regmap_write with clear register(PROTECTEN_CLR). * * This function disables the bus protection bits previously enabled with * mtk_infracfg_set_bus_protection. */ -int mtk_infracfg_clear_bus_protection(struct regmap *infracfg, u32 mask) + +int mtk_infracfg_clear_bus_protection(struct regmap *infracfg, u32 mask, + bool reg_update) { unsigned long expired; int ret; - regmap_update_bits(infracfg, INFRA_TOPAXI_PROTECTEN, mask, 0); + if (reg_update) + regmap_update_bits(infracfg, INFRA_TOPAXI_PROTECTEN, mask, 0); + else + regmap_write(infracfg, INFRA_TOPAXI_PROTECTEN_CLR, mask); expired = jiffies + HZ; diff --git a/drivers/soc/mediatek/mtk-scpsys.c b/drivers/soc/mediatek/mtk-scpsys.c index e570b6a..4c484b1 100644 --- a/drivers/soc/mediatek/mtk-scpsys.c +++ b/drivers/soc/mediatek/mtk-scpsys.c @@ -134,6 +134,7 @@ struct scp { void __iomem *base; struct regmap *infracfg; struct scp_ctrl_reg ctrl_reg; + bool bus_prot_reg_update; }; struct scp_subdomain { @@ -147,6 +148,7 @@ struct scp_soc_data { const struct scp_subdomain *subdomains; int num_subdomains; const struct scp_ctrl_reg regs; + bool bus_prot_reg_update; }; static int scpsys_domain_is_on(struct scp_domain *scpd) @@ -254,7 +256,8 @@ static int scpsys_power_on(struct generic_pm_domain *genpd) if (scpd->data->bus_prot_mask) { ret = mtk_infracfg_clear_bus_protection(scp->infracfg, - scpd->data->bus_prot_mask); + scpd->data->bus_prot_mask, + scp->bus_prot_reg_update); if (ret) goto err_pwr_ack; } @@ -289,7 +292,8 @@ static int scpsys_power_off(struct generic_pm_domain *genpd) if (scpd->data->bus_prot_mask) { ret = mtk_infracfg_set_bus_protection(scp->infracfg, - scpd->data->bus_prot_mask); + scpd->data->bus_prot_mask, + scp->bus_prot_reg_update); if (ret) goto out; } @@ -371,7 +375,8 @@ static void init_clks(struct platform_device *pdev, struct clk **clk) static struct scp *init_scp(struct platform_device *pdev, const struct scp_domain_data *scp_domain_data, int num, - const struct scp_ctrl_reg *scp_ctrl_reg) + const struct scp_ctrl_reg *scp_ctrl_reg, + bool bus_prot_reg_update) { struct genpd_onecell_data *pd_data; struct resource *res; @@ -386,6 +391,8 @@ static struct scp *init_scp(struct platform_device *pdev, scp->ctrl_reg.pwr_sta_offs = scp_ctrl_reg->pwr_sta_offs; scp->ctrl_reg.pwr_sta2nd_offs = scp_ctrl_reg->pwr_sta2nd_offs; + scp->bus_prot_reg_update = bus_prot_reg_update; + scp->dev = &pdev->dev; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); @@ -806,7 +813,8 @@ static void mtk_register_power_domains(struct platform_device *pdev, .regs = { .pwr_sta_offs = SPM_PWR_STATUS, .pwr_sta2nd_offs = SPM_PWR_STATUS_2ND - } + }, + .bus_prot_reg_update = true, }; static const struct scp_soc_data mt6797_data = { @@ -817,7 +825,8 @@ static void mtk_register_power_domains(struct platform_device *pdev, .regs = { .pwr_sta_offs = SPM_PWR_STATUS_MT6797, .pwr_sta2nd_offs = SPM_PWR_STATUS_2ND_MT6797 - } + }, + .bus_prot_reg_update = true, }; static const struct scp_soc_data mt7622_data = { @@ -826,7 +835,8 @@ static void mtk_register_power_domains(struct platform_device *pdev, .regs = { .pwr_sta_offs = SPM_PWR_STATUS, .pwr_sta2nd_offs = SPM_PWR_STATUS_2ND - } + }, + .bus_prot_reg_update = true, }; static const struct scp_soc_data mt8173_data = { @@ -837,7 +847,8 @@ static void mtk_register_power_domains(struct platform_device *pdev, .regs = { .pwr_sta_offs = SPM_PWR_STATUS, .pwr_sta2nd_offs = SPM_PWR_STATUS_2ND - } + }, + .bus_prot_reg_update = true, }; /* @@ -874,7 +885,8 @@ static int scpsys_probe(struct platform_device *pdev) match = of_match_device(of_scpsys_match_tbl, &pdev->dev); soc = (const struct scp_soc_data *)match->data; - scp = init_scp(pdev, soc->domains, soc->num_domains, &soc->regs); + scp = init_scp(pdev, soc->domains, soc->num_domains, &soc->regs, + soc->bus_prot_reg_update); if (IS_ERR(scp)) return PTR_ERR(scp); diff --git a/include/linux/soc/mediatek/infracfg.h b/include/linux/soc/mediatek/infracfg.h index e8d9f0d..b0a507d 100644 --- a/include/linux/soc/mediatek/infracfg.h +++ b/include/linux/soc/mediatek/infracfg.h @@ -28,7 +28,8 @@ #define MT7622_TOP_AXI_PROT_EN_WB (BIT(2) | BIT(6) | \ BIT(7) | BIT(8)) -int mtk_infracfg_set_bus_protection(struct regmap *infracfg, u32 mask); -int mtk_infracfg_clear_bus_protection(struct regmap *infracfg, u32 mask); - +int mtk_infracfg_set_bus_protection(struct regmap *infracfg, u32 mask, + bool reg_update); +int mtk_infracfg_clear_bus_protection(struct regmap *infracfg, u32 mask, + bool reg_update); #endif /* __SOC_MEDIATEK_INFRACFG_H */