Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932645AbbELLwO (ORCPT ); Tue, 12 May 2015 07:52:14 -0400 Received: from mail-lb0-f174.google.com ([209.85.217.174]:34874 "EHLO mail-lb0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932396AbbELLwJ (ORCPT ); Tue, 12 May 2015 07:52:09 -0400 MIME-Version: 1.0 In-Reply-To: <1431372206-1237-4-git-send-email-s.hauer@pengutronix.de> References: <1431372206-1237-1-git-send-email-s.hauer@pengutronix.de> <1431372206-1237-4-git-send-email-s.hauer@pengutronix.de> Date: Tue, 12 May 2015 13:52:06 +0200 Message-ID: Subject: Re: [PATCH 3/5] soc: Mediatek: Add SCPSYS power domain driver From: Matthias Brugger To: Sascha Hauer Cc: "linux-arm-kernel@lists.infradead.org" , "devicetree@vger.kernel.org" , Kevin Hilman , "linux-kernel@vger.kernel.org" , linux-mediatek@lists.infradead.org, "=Sascha Hauer" Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 18014 Lines: 485 2015-05-11 21:23 GMT+02:00 Sascha Hauer : > This adds a power domain driver for the Mediatek SCPSYS unit. > > The System Control Processor System (SCPSYS) has several power > management related tasks in the system. The tasks include thermal > measurement, dynamic voltage frequency scaling (DVFS), interrupt > filter and lowlevel sleep control. The System Power Manager (SPM) > inside the SCPSYS is for the MTCMOS power domain control. > > For now this driver only adds power domain support, the more > advanced features are not yet supported. The driver implements > the generic PM domain device tree bindings, the first user will > most likely be the Mediatek AFE audio driver. > > Signed-off-by: Sascha Hauer > --- > .../devicetree/bindings/soc/mediatek/scpsys.txt | 2 + > drivers/soc/mediatek/Kconfig | 8 + > drivers/soc/mediatek/Makefile | 1 + > drivers/soc/mediatek/mtk-scpsys.c | 416 +++++++++++++++++++++ > include/dt-bindings/power/mt8173-power.h | 15 + > 5 files changed, 442 insertions(+) > create mode 100644 drivers/soc/mediatek/mtk-scpsys.c > create mode 100644 include/dt-bindings/power/mt8173-power.h > > diff --git a/Documentation/devicetree/bindings/soc/mediatek/scpsys.txt b/Documentation/devicetree/bindings/soc/mediatek/scpsys.txt > index 4764a03..87f2091 100644 > --- a/Documentation/devicetree/bindings/soc/mediatek/scpsys.txt > +++ b/Documentation/devicetree/bindings/soc/mediatek/scpsys.txt > @@ -15,6 +15,7 @@ Required properties: > - compatible: Must be "mediatek,mt8173-scpsys" > - #power-domain-cells: Must be 1 > - reg: Address range of the SCPSYS unit > +- infracfg: must contain a phandle to the infracfg controller > > Example: > > @@ -22,6 +23,7 @@ Example: > #power-domain-cells = <1>; > compatible = "mediatek,mt8173-scpsys"; > reg = <0 0x10006000 0 0x1000>; > + infracfg = <&infracfg>; > }; > > Example consumer: > diff --git a/drivers/soc/mediatek/Kconfig b/drivers/soc/mediatek/Kconfig > index 6fae66f..1386c79 100644 > --- a/drivers/soc/mediatek/Kconfig > +++ b/drivers/soc/mediatek/Kconfig > @@ -18,3 +18,11 @@ config MTK_INFRACFG > Say yes here to add support for the MediaTek INFRACFG controller. The > INFRACFG controller contains various infrastructure registers not > directly associated to any device. > + > +config MTK_SCPSYS > + tristate "MediaTek SCPSYS Support" > + depends on MTK_INFRACFG > + select REGMAP > + help > + Say yes here to add support for the MediaTek SCPSYS power domain > + driver. > diff --git a/drivers/soc/mediatek/Makefile b/drivers/soc/mediatek/Makefile > index ce39119..f8eebab 100644 > --- a/drivers/soc/mediatek/Makefile > +++ b/drivers/soc/mediatek/Makefile > @@ -1,2 +1,3 @@ > obj-$(CONFIG_MTK_PMIC_WRAP) += mtk-pmic-wrap.o > obj-$(CONFIG_MTK_INFRACFG) += mtk-infracfg.o > +obj-$(CONFIG_MTK_SCPSYS) += mtk-scpsys.o > diff --git a/drivers/soc/mediatek/mtk-scpsys.c b/drivers/soc/mediatek/mtk-scpsys.c > new file mode 100644 > index 0000000..c42c7f1 > --- /dev/null > +++ b/drivers/soc/mediatek/mtk-scpsys.c > @@ -0,0 +1,416 @@ > +/* > + * Copyright (c) 2015 Pengutronix, Sascha Hauer > + * > + * This program is free software; you can redistribute it and/or modify > + * it under the terms of the GNU General Public License version 2 as > + * published by the Free Software Foundation. > + * > + * 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 > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > + > +#define SPM_VDE_PWR_CON 0x0210 > +#define SPM_MFG_PWR_CON 0x0214 > +#define SPM_VEN_PWR_CON 0x0230 > +#define SPM_ISP_PWR_CON 0x0238 > +#define SPM_DIS_PWR_CON 0x023c > +#define SPM_VEN2_PWR_CON 0x0298 > +#define SPM_AUDIO_PWR_CON 0x029c > +#define SPM_MFG_2D_PWR_CON 0x02c0 > +#define SPM_MFG_ASYNC_PWR_CON 0x02c4 > +#define SPM_USB_PWR_CON 0x02cc > +#define SPM_PWR_STATUS 0x060c > +#define SPM_PWR_STATUS_2ND 0x0610 > + > +#define PWR_RST_B_BIT BIT(0) > +#define PWR_ISO_BIT BIT(1) > +#define PWR_ON_BIT BIT(2) > +#define PWR_ON_2ND_BIT BIT(3) > +#define PWR_CLK_DIS_BIT BIT(4) > + > +#define DIS_PWR_STA_MASK BIT(3) > +#define MFG_PWR_STA_MASK BIT(4) > +#define ISP_PWR_STA_MASK BIT(5) > +#define VDE_PWR_STA_MASK BIT(7) > +#define VEN2_PWR_STA_MASK BIT(20) > +#define VEN_PWR_STA_MASK BIT(21) > +#define MFG_2D_PWR_STA_MASK BIT(22) > +#define MFG_ASYNC_PWR_STA_MASK BIT(23) > +#define AUDIO_PWR_STA_MASK BIT(24) > +#define USB_PWR_STA_MASK BIT(25) > + > +struct scp_domain_data { > + const char *name; > + u32 sta_mask; > + int ctl_offs; > + u32 sram_pdn_bits; > + u32 sram_pdn_ack_bits; > + u32 bus_prot_mask; > + int id; > + const char *clk_name; > +}; > + > +static const struct scp_domain_data scp_domain_data[] = { > + { > + .id = MT8173_POWER_DOMAIN_VDE, > + .name = "vde", > + .sta_mask = VDE_PWR_STA_MASK, > + .ctl_offs = SPM_VDE_PWR_CON, > + .sram_pdn_bits = GENMASK(11, 8), > + .sram_pdn_ack_bits = GENMASK(12, 12), > + .clk_name = "vdec", > + }, { > + .id = MT8173_POWER_DOMAIN_VEN, > + .name = "ven", > + .sta_mask = VEN_PWR_STA_MASK, > + .ctl_offs = SPM_VEN_PWR_CON, > + .sram_pdn_bits = GENMASK(11, 8), > + .sram_pdn_ack_bits = GENMASK(15, 12), > + .clk_name = "venc", > + }, { > + .id = MT8173_POWER_DOMAIN_ISP, > + .name = "isp", > + .sta_mask = ISP_PWR_STA_MASK, > + .ctl_offs = SPM_ISP_PWR_CON, > + .sram_pdn_bits = GENMASK(11, 8), > + .sram_pdn_ack_bits = GENMASK(13, 12), > + }, { > + .id = MT8173_POWER_DOMAIN_DIS, > + .name = "disp", > + .sta_mask = DIS_PWR_STA_MASK, > + .ctl_offs = SPM_DIS_PWR_CON, > + .sram_pdn_bits = GENMASK(11, 8), > + .sram_pdn_ack_bits = GENMASK(12, 12), > + .clk_name = "disp", > + .bus_prot_mask = MT8173_TOP_AXI_PROT_EN_MM_M0 | > + MT8173_TOP_AXI_PROT_EN_MM_M1, > + }, { > + .id = MT8173_POWER_DOMAIN_VEN2, > + .name = "ven2", > + .sta_mask = VEN2_PWR_STA_MASK, > + .ctl_offs = SPM_VEN2_PWR_CON, > + .sram_pdn_bits = GENMASK(11, 8), > + .sram_pdn_ack_bits = GENMASK(15, 12), > + .clk_name = "ven2", > + }, { > + .id = MT8173_POWER_DOMAIN_AUDIO, > + .name = "audio", > + .sta_mask = AUDIO_PWR_STA_MASK, > + .ctl_offs = SPM_AUDIO_PWR_CON, > + .sram_pdn_bits = GENMASK(11, 8), > + .sram_pdn_ack_bits = GENMASK(15, 12), > + }, { > + .id = MT8173_POWER_DOMAIN_MFG_ASYNC, > + .name = "mfg_async", > + .sta_mask = MFG_ASYNC_PWR_STA_MASK, > + .ctl_offs = SPM_MFG_ASYNC_PWR_CON, > + .sram_pdn_bits = GENMASK(11, 8), > + .sram_pdn_ack_bits = 0, > + .clk_name = "mfg", > + }, { > + .id = MT8173_POWER_DOMAIN_MFG_2D, > + .name = "mfg_2d", > + .sta_mask = MFG_2D_PWR_STA_MASK, > + .ctl_offs = SPM_MFG_2D_PWR_CON, > + .sram_pdn_bits = GENMASK(11, 8), > + .sram_pdn_ack_bits = GENMASK(13, 12), > + .clk_name = "mfg", > + }, { > + .id = MT8173_POWER_DOMAIN_MFG, > + .name = "mfg", > + .sta_mask = MFG_PWR_STA_MASK, > + .ctl_offs = SPM_MFG_PWR_CON, > + .sram_pdn_bits = GENMASK(13, 8), > + .sram_pdn_ack_bits = GENMASK(21, 16), > + .clk_name = "mfg", > + .bus_prot_mask = MT8173_TOP_AXI_PROT_EN_MFG_S | > + MT8173_TOP_AXI_PROT_EN_MFG_M0 | > + MT8173_TOP_AXI_PROT_EN_MFG_M1 | > + MT8173_TOP_AXI_PROT_EN_MFG_SNOOP_OUT, > + }, { > + .id = MT8173_POWER_DOMAIN_USB, > + .name = "usb", > + .sta_mask = USB_PWR_STA_MASK, > + .ctl_offs = SPM_USB_PWR_CON, > + .sram_pdn_bits = GENMASK(11, 8), > + .sram_pdn_ack_bits = GENMASK(15, 12), > + }, > +}; > + > +#define NUM_DOMAINS ARRAY_SIZE(scp_domain_data) > + > +struct scp; > + > +struct scp_domain { > + struct generic_pm_domain pmd; > + const struct scp_domain_data *data; > + struct scp *scp; > + struct clk *clk; > +}; > + > +struct scp { > + struct scp_domain domains[NUM_DOMAINS]; > + struct genpd_onecell_data pd_data; > + struct device *dev; > + void __iomem *base; > + struct regmap *infracfg; > +}; > + > +static int scpsys_power_on(struct generic_pm_domain *genpd) > +{ > + struct scp_domain *scpd = container_of(genpd, struct scp_domain, pmd); > + struct scp *scp = scpd->scp; > + const struct scp_domain_data *data = scpd->data; > + unsigned long expired; > + void __iomem *ctl_addr = scpd->scp->base + data->ctl_offs; > + u32 sram_pdn_ack = data->sram_pdn_ack_bits; > + u32 val; > + int ret; > + > + if (scpd->clk) { > + ret = clk_prepare_enable(scpd->clk); > + if (ret) > + return ret; > + } > + > + val = readl(ctl_addr); > + val |= PWR_ON_BIT; > + writel(val, ctl_addr); > + val |= PWR_ON_2ND_BIT; > + writel(val, ctl_addr); > + > + /* wait until PWR_ACK = 1 */ > + expired = jiffies + HZ; > + while (!(readl(scp->base + SPM_PWR_STATUS) & data->sta_mask) || > + !(readl(scp->base + SPM_PWR_STATUS_2ND) & data->sta_mask)) { Nit pick, line over 80 characters. > + cpu_relax(); > + if (time_after(jiffies, expired)) { > + ret = -EIO; > + goto out; > + } > + } > + > + val &= ~PWR_CLK_DIS_BIT; > + writel(val, ctl_addr); > + > + val &= ~PWR_ISO_BIT; > + writel(val, ctl_addr); > + > + val |= PWR_RST_B_BIT; > + writel(val, ctl_addr); > + > + val &= ~data->sram_pdn_bits; > + writel(val, ctl_addr); > + > + /* wait until SRAM_PDN_ACK all 0 */ > + expired = jiffies + HZ; > + while (sram_pdn_ack && (readl(ctl_addr) & sram_pdn_ack)) { > + cpu_relax(); > + if (time_after(jiffies, expired)) { > + ret = -EIO; > + goto out; > + } > + } > + > + if (data->bus_prot_mask) { > + ret = mtk_infracfg_clear_bus_protection(scp->infracfg, > + data->bus_prot_mask); > + if (ret) > + return ret; > + } > + > + return 0; > +out: > + dev_err(scp->dev, "Failed to power on domain %s\n", scpd->data->name); > + > + return ret; > +} > + > +static int scpsys_power_off(struct generic_pm_domain *genpd) > +{ > + struct scp_domain *scpd = container_of(genpd, struct scp_domain, pmd); > + struct scp *scp = scpd->scp; > + const struct scp_domain_data *data = scpd->data; > + unsigned long expired; > + void __iomem *ctl_addr = scpd->scp->base + data->ctl_offs; > + u32 sram_pdn_ack = data->sram_pdn_ack_bits; > + u32 val; > + int ret; > + > + if (data->bus_prot_mask) { > + ret = mtk_infracfg_set_bus_protection(scp->infracfg, > + data->bus_prot_mask); > + if (ret) > + return ret; > + } > + > + val = readl(ctl_addr); > + val |= data->sram_pdn_bits; > + writel(val, ctl_addr); > + > + /* wait until SRAM_PDN_ACK all 1 */ > + expired = jiffies + HZ; > + while ((readl(ctl_addr) & sram_pdn_ack) != sram_pdn_ack) { > + cpu_relax(); > + if (time_after(jiffies, expired)) { > + ret = -EIO; > + goto out; > + } > + } > + > + val |= PWR_ISO_BIT; > + writel(val, ctl_addr); > + > + val &= ~PWR_RST_B_BIT; > + writel(val, ctl_addr); > + > + val |= PWR_CLK_DIS_BIT; > + writel(val, ctl_addr); > + > + val &= ~PWR_ON_BIT; > + writel(val, ctl_addr); > + > + val &= ~PWR_ON_2ND_BIT; > + writel(val, ctl_addr); > + > + /* wait until PWR_ACK = 0 */ > + expired = jiffies + HZ; > + while ((readl(scp->base + SPM_PWR_STATUS) & data->sta_mask) || > + (readl(scp->base + SPM_PWR_STATUS_2ND) & data->sta_mask)) { Same here. > + cpu_relax(); > + if (time_after(jiffies, expired)) { > + ret = -EIO; > + goto out; > + } > + } > + > + if (scpd->clk) > + clk_disable_unprepare(scpd->clk); > + > + return 0; > + > +out: > + dev_err(scp->dev, "Failed to power off domain %s\n", scpd->data->name); > + > + return ret; > +} > + > +static int scpsys_probe(struct platform_device *pdev) > +{ > + struct genpd_onecell_data *pd_data; > + struct resource *res; > + int i; > + struct scp *scp; > + > + scp = devm_kzalloc(&pdev->dev, sizeof(*scp), GFP_KERNEL); > + if (!scp) > + return -ENOMEM; > + > + scp->dev = &pdev->dev; > + > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + scp->base = devm_ioremap_resource(&pdev->dev, res); > + if (IS_ERR(scp->base)) > + return PTR_ERR(scp->base); > + > + pd_data = &scp->pd_data; > + > + pd_data->domains = devm_kzalloc(&pdev->dev, > + sizeof(*pd_data->domains) * NUM_DOMAINS, GFP_KERNEL); > + if (!pd_data->domains) > + return -ENOMEM; > + > + scp->infracfg = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, > + "infracfg"); > + if (IS_ERR(scp->infracfg)) { > + dev_err(&pdev->dev, "Cannot find infracfg controller: %ld\n", > + PTR_ERR(scp->infracfg)); > + return PTR_ERR(scp->infracfg); > + } > + > + pd_data->num_domains = NUM_DOMAINS; > + > + for (i = 0; i < NUM_DOMAINS; i++) { > + struct scp_domain *scpd = &scp->domains[i]; > + > + if (scp_domain_data[i].clk_name) { > + const char *name = scp_domain_data[i].clk_name; > + > + scpd->clk = devm_clk_get(&pdev->dev, name); > + if (IS_ERR(scpd->clk)) { > + dev_err(&pdev->dev, "Failed to get %s clk: %ld\n", > + name, PTR_ERR(scpd->clk)); > + return PTR_ERR(scpd->clk); > + } > + } > + } > + > + for (i = 0; i < NUM_DOMAINS; i++) { Why two for loops? > + struct scp_domain *scpd = &scp->domains[i]; > + struct generic_pm_domain *pmd = &scpd->pmd; > + > + pd_data->domains[scp_domain_data[i].id] = pmd; > + scpd->data = &scp_domain_data[i]; > + scpd->scp = scp; > + > + pmd->name = scp_domain_data[i].name; > + pmd->power_off = scpsys_power_off; > + pmd->power_on = scpsys_power_on; > + pmd->power_off_latency_ns = 20000; > + pmd->power_on_latency_ns = 20000; > + > + pm_genpd_init(pmd, NULL, true); > + > + /* > + * If PM is disabled turn on all domains by default so that > + * consumers can work. > + */ > + if (!IS_ENABLED(CONFIG_PM)) > + pmd->power_on(pmd); > + } > + > + pm_genpd_add_subdomain(&scp->domains[MT8173_POWER_DOMAIN_MFG_ASYNC].pmd, > + &scp->domains[MT8173_POWER_DOMAIN_MFG_2D].pmd); > + pm_genpd_add_subdomain(&scp->domains[MT8173_POWER_DOMAIN_MFG_2D].pmd, > + &scp->domains[MT8173_POWER_DOMAIN_MFG].pmd); > + > + return of_genpd_add_provider_onecell(pdev->dev.of_node, pd_data); > +} > + > +static struct of_device_id of_scpsys_match_tbl[] = { static const? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/