From patchwork Thu Aug 28 19:36:05 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Doug Anderson X-Patchwork-Id: 4807851 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 2F9C39F37E for ; Thu, 28 Aug 2014 19:40:11 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id BFC4B200FE for ; Thu, 28 Aug 2014 19:40:09 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 767F420109 for ; Thu, 28 Aug 2014 19:40:08 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1XN5VM-0007re-M5; Thu, 28 Aug 2014 19:37:08 +0000 Received: from mail-pa0-x22d.google.com ([2607:f8b0:400e:c03::22d]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1XN5VA-0007kx-2X for linux-arm-kernel@lists.infradead.org; Thu, 28 Aug 2014 19:36:57 +0000 Received: by mail-pa0-f45.google.com with SMTP id bj1so3791568pad.32 for ; Thu, 28 Aug 2014 12:36:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-type:content-transfer-encoding; bh=77BguYciXX+EEMx/3Op8Y5CFDq0PafhWs1K3evYuIQs=; b=e8nvc6T0VPoOTxiT7JthUh3O1IQdJscsCq54935qbmYGXC1wjlzm6MqD+UbZB/KBUk JKiNoIdEftZMeAXGTBxOCiTtO30jfKbeBcSHkMxFpg/LbdCgWXML/NZAgn2xjnMv2qca sYbBN42JZv3p2v+dk/YfjGCPHDdpd6TMsB+sY= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-type:content-transfer-encoding; bh=77BguYciXX+EEMx/3Op8Y5CFDq0PafhWs1K3evYuIQs=; b=Dx1e2bgD0G6fyHUY1gr25Yo6s8t7x6UGt4ZvLBd4T2odvhdVb6XmDx4We7mxdhBeGF bqJA+McaX2S8nLjYHmxrMuwsR+/qQPvfDzsHcxjQv37i/R1Adg4povhbtKIT1BamBuzl FyPOkCIeQ+Nc1h9Gg13tCxyIWCqXRsBYDh9ZpQcxDMn7oTC9siIs0K2LmbZc70ya6UVe ITN6uw0a6VuIxW2QmLhfdGUvVZPHugB6gu/NcFLITTzIdUGUCJwBmvTrIUn55wYIX1wy Eely1y1ishzK2fEmoOyloowv5hv7TiCLUwZohhV7PUhsAZZ97mIDO5o8AEicQiSIGg87 mFnA== X-Gm-Message-State: ALoCoQnxWaDkHpCKkOHWdKs0oACFK6BtqcZVX67C92vt6Tc3YC1U4bcMwjU816qW1xb1CiSeqx9c X-Received: by 10.68.139.232 with SMTP id rb8mr9115708pbb.20.1409254593240; Thu, 28 Aug 2014 12:36:33 -0700 (PDT) Received: from tictac.mtv.corp.google.com (tictac.mtv.corp.google.com [172.22.162.15]) by mx.google.com with ESMTPSA id gf5sm4313884pbc.89.2014.08.28.12.36.31 for (version=TLSv1.1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Thu, 28 Aug 2014 12:36:32 -0700 (PDT) From: Doug Anderson To: Mark Brown , Heiko Stuebner , olof@lixom.net, Arnd Bergmann Subject: [PATCH 2/2] soc/rockchip: io-domain: add driver handling io domains Date: Thu, 28 Aug 2014 12:36:05 -0700 Message-Id: <1409254565-10677-3-git-send-email-dianders@chromium.org> X-Mailer: git-send-email 2.1.0.rc2.206.gedb03e5 In-Reply-To: <1409254565-10677-1-git-send-email-dianders@chromium.org> References: <1409254565-10677-1-git-send-email-dianders@chromium.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140828_123656_218137_1256E3DB X-CRM114-Status: GOOD ( 26.35 ) X-Spam-Score: -0.1 (/) Cc: mark.rutland@arm.com, devicetree@vger.kernel.org, Addy Ke , swarren@nvidia.com, pawel.moll@arm.com, ijc+devicetree@hellion.org.uk, linux-kernel@vger.kernel.org, pdeschrijver@nvidia.com, agross@codeaurora.org, Doug Anderson , sandeep_n@ti.com, robh+dt@kernel.org, santosh.shilimkar@ti.com, galak@codeaurora.org, grant.likely@linaro.org, treding@nvidia.com, Sonny Rao , linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-1.8 required=5.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_NONE,RP_MATCHES_RCVD,T_DKIM_INVALID,UNPARSEABLE_RELAY autolearn=no version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Heiko Stübner IO domain voltages on some Rockchip SoCs are variable but need to be kept in sync between the regulators and a special register. Signed-off-by: Heiko Stübner Signed-off-by: Doug Anderson --- .../devicetree/bindings/arm/rockchip/io-domain.txt | 60 ++++ drivers/soc/Kconfig | 1 + drivers/soc/Makefile | 1 + drivers/soc/rockchip/Kconfig | 10 + drivers/soc/rockchip/Makefile | 1 + drivers/soc/rockchip/io-domain.c | 333 +++++++++++++++++++++ 6 files changed, 406 insertions(+) create mode 100644 Documentation/devicetree/bindings/arm/rockchip/io-domain.txt create mode 100644 drivers/soc/rockchip/Kconfig create mode 100644 drivers/soc/rockchip/Makefile create mode 100644 drivers/soc/rockchip/io-domain.c diff --git a/Documentation/devicetree/bindings/arm/rockchip/io-domain.txt b/Documentation/devicetree/bindings/arm/rockchip/io-domain.txt new file mode 100644 index 0000000..20b4965 --- /dev/null +++ b/Documentation/devicetree/bindings/arm/rockchip/io-domain.txt @@ -0,0 +1,60 @@ +Rockchip SRAM for IO Voltage Domains: +------------------------------------- + +IO domain voltages on some Rockchip SoCs are variable but need to be +kept in sync between the regulators and a special register. + +We can specify which regulator is associated with which IO Voltage +Domain and then we can automatically adjust the register to match +what's actually being provided on the rails. + +Required properties: +- compatible: should be one of: + - "rockchip,rk3188-iodomain" for rk3188 + - "rockchip,rk3288-iodomain" for rk3288 + +You specify supplies using the standard regulator bindings by including +a phandle the the relevant regulator. All specified supplies must be able +to report their voltage. The IO Voltage Domain for any non-specified +supplies will be not be touched. + +Possible supplies for rk3188: +- ap0-supply: The supply connected to AP0_VCC. +- ap1-supply: The supply connected to AP1_VCC. +- cif-supply: The supply connected to CIF_VCC. +- flash-supply: The supply connected to FLASH_VCC. +- lcdc0-supply: The supply connected to LCD0_VCC. +- lcdc1-supply: The supply connected to LCD1_VCC. +- vccio0-supply: The supply connected to VCCIO0. +- vccio1-supply: The supply connected to VCCIO1. + Sometimes also labeled VCCIO1 and VCCIO2. + +Possible supplies for rk3288: +- audio-supply: The supply connected to APIO4_VDD. +- bb-supply: The supply connected to APIO5_VDD. +- dvp-supply: The supply connected to DVPIO_VDD. +- flash0-supply: The supply connected to FLASH0_VDD. Typically for eMMC +- flash1-supply: The supply connected to FLASH1_VDD. Also known as SDIO1. +- gpio30-supply: The supply connected to APIO1_VDD. +- gpio1830 The supply connected to APIO2_VDD. +- lcdc-supply: The supply connected to LCDC_VDD. +- sdcard-supply: The supply connected to SDMMC0_VDD. +- wifi-supply: The supply connected to APIO3_VDD. Also known as SDIO0. + + +Example: + + io-domains { + compatible = "rockchip,rk3288-iodomain"; + rockchip,grf = <&grf>; + + audio-supply = <&vcc18_codec>; + bb-supply = <&vcc33_io>; + dvp-supply = <&vcc_18>; + flash0-supply = <&vcc18_flashio>; + gpio1830-supply = <&vcc33_io>; + gpio30-supply = <&vcc33_pmuio>; + lcdc-supply = <&vcc33_lcd>; + sdcard-supply = <&vccio_sd>; + wifi-supply = <&vcc18_wl>; + }; diff --git a/drivers/soc/Kconfig b/drivers/soc/Kconfig index c854385..443d946 100644 --- a/drivers/soc/Kconfig +++ b/drivers/soc/Kconfig @@ -1,5 +1,6 @@ menu "SOC (System On Chip) specific Drivers" source "drivers/soc/qcom/Kconfig" +source "drivers/soc/rockchip/Kconfig" endmenu diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile index 3b1b95d..52808bf 100644 --- a/drivers/soc/Makefile +++ b/drivers/soc/Makefile @@ -3,4 +3,5 @@ # obj-$(CONFIG_ARCH_QCOM) += qcom/ +obj-$(CONFIG_ARCH_ROCKCHIP) += rockchip/ obj-$(CONFIG_ARCH_TEGRA) += tegra/ diff --git a/drivers/soc/rockchip/Kconfig b/drivers/soc/rockchip/Kconfig new file mode 100644 index 0000000..d25cb53 --- /dev/null +++ b/drivers/soc/rockchip/Kconfig @@ -0,0 +1,10 @@ +# +# Rockchip Soc drivers +# +config ROCKCHIP_IODOMAIN + tristate "Rockchip IO domain support" + depends on ARCH_ROCKCHIP && OF + help + Say y here to enable support io domains on Rockchip SoCs. It is + necessary for the io domain setting of the SoC to match the + voltage supplied by the regulators. diff --git a/drivers/soc/rockchip/Makefile b/drivers/soc/rockchip/Makefile new file mode 100644 index 0000000..dbf6da9 --- /dev/null +++ b/drivers/soc/rockchip/Makefile @@ -0,0 +1 @@ +obj-$(CONFIG_ROCKCHIP_IODOMAIN) += io-domain.o diff --git a/drivers/soc/rockchip/io-domain.c b/drivers/soc/rockchip/io-domain.c new file mode 100644 index 0000000..f4e0ebc --- /dev/null +++ b/drivers/soc/rockchip/io-domain.c @@ -0,0 +1,333 @@ +/* + * Rockchip IO Voltage Domain driver + * + * Copyright 2014 MundoReader S.L. + * Copyright 2014 Google, Inc. + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * 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 + +#define MAX_SUPPLIES 16 + +#define MAX_VOLTAGE_1_8 1980000 +#define MAX_VOLTAGE_3_3 3600000 + +struct rockchip_iodomain; + +/** + * @supplies: voltage settings matching the register bits. + */ +struct rockchip_iodomain_soc_data { + int grf_offset; + const char *supply_names[MAX_SUPPLIES]; + void (*init)(struct rockchip_iodomain *iod); +}; + +struct rockchip_iodomain_supply { + struct rockchip_iodomain *iod; + struct regulator *reg; + struct notifier_block nb; + int idx; +}; + +struct rockchip_iodomain { + struct device *dev; + struct regmap *grf; + struct rockchip_iodomain_soc_data *soc_data; + struct rockchip_iodomain_supply supplies[MAX_SUPPLIES]; +}; + +static int rockchip_iodomain_write(struct rockchip_iodomain_supply *supply, + int uV) +{ + struct rockchip_iodomain *iod = supply->iod; + u32 val; + int ret; + + /* set value bit */ + val = (uV > MAX_VOLTAGE_1_8) ? 0 : 1; + val <<= supply->idx; + + /* apply hiword-mask */ + val |= (BIT(supply->idx) << 16); + + ret = regmap_write(iod->grf, iod->soc_data->grf_offset, val); + if (ret) + dev_err(iod->dev, "Couldn't write to GRF\n"); + + return ret; +} + +static int rockchip_iodomain_notify(struct notifier_block *nb, + unsigned long event, + void *data) +{ + struct rockchip_iodomain_supply *supply = + container_of(nb, struct rockchip_iodomain_supply, nb); + int uV; + int ret; + + /* + * According to Rockchip it's important to keep the SoC IO domain + * higher than (or equal to) the external voltage. That means we need + * to change it before external voltage changes happen in the case + * of an increase. + */ + if (event & REGULATOR_EVENT_PRE_VOLTAGE_CHANGE) { + struct pre_voltage_change_data *pvc_data = data; + + uV = max_t(unsigned long, pvc_data->old_uV, pvc_data->max_uV); + } else if (event & (REGULATOR_EVENT_VOLTAGE_CHANGE | + REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE)) { + uV = (unsigned long)data; + } else { + return NOTIFY_OK; + } + + dev_dbg(supply->iod->dev, "Setting to %d\n", uV); + + if (uV > MAX_VOLTAGE_3_3) { + dev_err(supply->iod->dev, "Voltage too high: %d\n", uV); + + if (event == REGULATOR_EVENT_PRE_VOLTAGE_CHANGE) + return NOTIFY_BAD; + } + + ret = rockchip_iodomain_write(supply, uV); + if (ret && event == REGULATOR_EVENT_PRE_VOLTAGE_CHANGE) + return NOTIFY_BAD; + + dev_info(supply->iod->dev, "Setting to %d done\n", uV); + return NOTIFY_OK; +} + +#define RK3288_SOC_CON2 0x24c +#define RK3288_SOC_CON2_FLASH0 BIT(7) +#define RK3288_SOC_FLASH_SUPPLY_NUM 2 + +static void rk3288_iodomain_init(struct rockchip_iodomain *iod) +{ + int ret; + u32 val; + + /* if no flash supply we should leave things alone */ + if (!iod->supplies[RK3288_SOC_FLASH_SUPPLY_NUM].reg) + return; + + /* + * set flash0 iodomain to also use this framework + * instead of a special gpio. + */ + val = RK3288_SOC_CON2_FLASH0 | (RK3288_SOC_CON2_FLASH0 << 16); + ret = regmap_write(iod->grf, RK3288_SOC_CON2, val); + if (ret < 0) + dev_warn(iod->dev, "couldn't update flash0 ctrl\n"); +} + +/* + * On the rk3188 the io-domains are handled by a shared register with the + * lower 8 bits being still being continuing drive-strength settings. + */ +static const struct rockchip_iodomain_soc_data soc_data_rk3188 = { + .grf_offset = 0x104, + .supply_names = { + NULL, + NULL, + NULL, + NULL, + NULL, + NULL, + NULL, + NULL, + "ap0", + "ap1", + "cif", + "flash", + "vccio0", + "vccio1", + "lcdc0", + "lcdc1", + }, +}; + +static const struct rockchip_iodomain_soc_data soc_data_rk3288 = { + .grf_offset = 0x380, + .supply_names = { + "lcdc", /* LCDC_VDD */ + "dvp", /* DVPIO_VDD */ + "flash0", /* FLASH0_VDD (emmc) */ + "flash1", /* FLASH1_VDD (sdio1) */ + "wifi", /* APIO3_VDD (sdio0) */ + "bb", /* APIO5_VDD */ + "audio", /* APIO4_VDD */ + "sdcard", /* SDMMC0_VDD (sdmmc) */ + "gpio30", /* APIO1_VDD */ + "gpio1830", /* APIO2_VDD */ + }, + .init = rk3288_iodomain_init, +}; + +static const struct of_device_id rockchip_iodomain_match[] = { + { + .compatible = "rockchip,rk3188-iodomain", + .data = (void *)&soc_data_rk3188 + }, + { + .compatible = "rockchip,rk3288-iodomain", + .data = (void *)&soc_data_rk3288 + }, + { /* sentinel */ }, +}; + +static int rockchip_iodomain_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + const struct of_device_id *match; + struct rockchip_iodomain *iod; + int i, ret; + + if (!np) + return -ENODEV; + + iod = devm_kzalloc(&pdev->dev, sizeof(*iod), GFP_KERNEL); + if (!iod) + return -ENOMEM; + + iod->dev = &pdev->dev; + platform_set_drvdata(pdev, iod); + + match = of_match_node(rockchip_iodomain_match, np); + iod->soc_data = (struct rockchip_iodomain_soc_data *)match->data; + + iod->grf = syscon_regmap_lookup_by_phandle(np, "rockchip,grf"); + if (IS_ERR(iod->grf)) { + dev_err(&pdev->dev, "couldn't find grf regmap\n"); + return PTR_ERR(iod->grf); + } + + for (i = 0; i < MAX_SUPPLIES; i++) { + const char *supply_name = iod->soc_data->supply_names[i]; + struct rockchip_iodomain_supply *supply = &iod->supplies[i]; + struct regulator *reg; + int uV; + + if (!supply_name) + continue; + + reg = devm_regulator_get_optional(iod->dev, supply_name); + if (IS_ERR(reg)) { + ret = PTR_ERR(reg); + + /* If a supply wasn't specified, that's OK */ + if (ret == -ENODEV) + continue; + else if (ret != -EPROBE_DEFER) + dev_err(iod->dev, "couldn't get regulator %s\n", + supply_name); + goto unreg_notify; + } + + /* set initial correct value */ + uV = regulator_get_voltage(reg); + + /* must be a regulator we can get the voltage of */ + if (uV < 0) { + dev_err(iod->dev, "Can't determine voltage: %s\n", + supply_name); + goto unreg_notify; + } + + if (uV > MAX_VOLTAGE_3_3) { + dev_crit(iod->dev, + "%d uV is too high. May damage SoC!\n", + uV); + ret = -EINVAL; + goto unreg_notify; + } + + /* setup our supply */ + supply->idx = i; + supply->iod = iod; + supply->reg = reg; + supply->nb.notifier_call = rockchip_iodomain_notify; + + ret = rockchip_iodomain_write(supply, uV); + if (ret) { + supply->reg = NULL; + goto unreg_notify; + } + + /* register regulator notifier */ + ret = regulator_register_notifier(reg, &supply->nb); + if (ret) { + dev_err(&pdev->dev, + "regulator notifier request failed\n"); + supply->reg = NULL; + goto unreg_notify; + } + } + + if (iod->soc_data->init) + iod->soc_data->init(iod); + + return 0; + +unreg_notify: + for (i = MAX_SUPPLIES - 1; i >= 0; i--) { + struct rockchip_iodomain_supply *io_supply = &iod->supplies[i]; + + if (io_supply->reg) + regulator_unregister_notifier(io_supply->reg, + &io_supply->nb); + } + + return ret; +} + +static int rockchip_iodomain_remove(struct platform_device *pdev) +{ + struct rockchip_iodomain *iod = platform_get_drvdata(pdev); + int i; + + for (i = MAX_SUPPLIES - 1; i >= 0; i--) { + struct rockchip_iodomain_supply *io_supply = &iod->supplies[i]; + + if (io_supply->reg) + regulator_unregister_notifier(io_supply->reg, + &io_supply->nb); + } + + return 0; +} + +static struct platform_driver rockchip_iodomain_driver = { + .probe = rockchip_iodomain_probe, + .remove = rockchip_iodomain_remove, + .driver = { + .name = "rockchip-iodomain", + .of_match_table = rockchip_iodomain_match, + }, +}; + +module_platform_driver(rockchip_iodomain_driver); + +MODULE_DESCRIPTION("Rockchip IO-domain driver"); +MODULE_AUTHOR("Heiko Stuebner "); +MODULE_AUTHOR("Doug Anderson "); +MODULE_LICENSE("GPL v2");