Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752205AbaB1LZ1 (ORCPT ); Fri, 28 Feb 2014 06:25:27 -0500 Received: from ns.mm-sol.com ([37.157.136.199]:49019 "EHLO extserv.mm-sol.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751628AbaB1LZV (ORCPT ); Fri, 28 Feb 2014 06:25:21 -0500 From: Georgi Djakov To: linux-mmc@vger.kernel.org, cjb@laptop.org, ulf.hansson@linaro.org, devicetree@vger.kernel.org, grant.likely@linaro.org, robh+dt@kernel.org, pawel.moll@arm.com, mark.rutland@arm.com, swarren@wwwdotorg.org, ijc+devicetree@hellion.org.uk, galak@codeaurora.org, rob@landley.net Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, Georgi Djakov Subject: [PATCH v9 2/3] mmc: sdhci-msm: Initial support for Qualcomm chipsets Date: Fri, 28 Feb 2014 13:24:34 +0200 Message-Id: <1393586675-14628-3-git-send-email-gdjakov@mm-sol.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1393586675-14628-1-git-send-email-gdjakov@mm-sol.com> References: <1393586675-14628-1-git-send-email-gdjakov@mm-sol.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This platform driver adds the initial support of Secure Digital Host Controller Interface compliant controller found in Qualcomm chipsets. Signed-off-by: Asutosh Das Signed-off-by: Venkat Gopalakrishnan Tested-by: Ivan T. Ivanov Signed-off-by: Georgi Djakov --- drivers/mmc/host/Kconfig | 13 ++ drivers/mmc/host/Makefile | 1 + drivers/mmc/host/sdhci-msm.c | 528 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 542 insertions(+) create mode 100644 drivers/mmc/host/sdhci-msm.c diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig index 82cc34d..66ef8b9 100644 --- a/drivers/mmc/host/Kconfig +++ b/drivers/mmc/host/Kconfig @@ -334,6 +334,19 @@ config MMC_ATMELMCI If unsure, say N. +config MMC_SDHCI_MSM + tristate "Qualcomm SDHCI Controller Support" + depends on ARCH_QCOM + depends on MMC_SDHCI_PLTFM + help + This selects the Secure Digital Host Controller Interface (SDHCI) + support present in Qualcomm SOCs. The controller supports + SD/MMC/SDIO devices. + + If you have a controller with this interface, say Y or M here. + + If unsure, say N. + config MMC_MSM tristate "Qualcomm SDCC Controller Support" depends on MMC && (ARCH_MSM7X00A || ARCH_MSM7X30 || ARCH_QSD8X50) diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile index f162f87a0..0c8aa5e 100644 --- a/drivers/mmc/host/Makefile +++ b/drivers/mmc/host/Makefile @@ -63,6 +63,7 @@ obj-$(CONFIG_MMC_SDHCI_OF_ESDHC) += sdhci-of-esdhc.o obj-$(CONFIG_MMC_SDHCI_OF_HLWD) += sdhci-of-hlwd.o obj-$(CONFIG_MMC_SDHCI_BCM_KONA) += sdhci-bcm-kona.o obj-$(CONFIG_MMC_SDHCI_BCM2835) += sdhci-bcm2835.o +obj-$(CONFIG_MMC_SDHCI_MSM) += sdhci-msm.o ifeq ($(CONFIG_CB710_DEBUG),y) CFLAGS-cb710-mmc += -DDEBUG diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c new file mode 100644 index 0000000..b4490a2 --- /dev/null +++ b/drivers/mmc/host/sdhci-msm.c @@ -0,0 +1,528 @@ +/* + * drivers/mmc/host/sdhci-msm.c - Qualcomm SDHCI Platform driver + * + * Copyright (c) 2013-2014, The Linux Foundation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only 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 "sdhci-pltfm.h" + +#define CORE_HC_MODE 0x78 +#define HC_MODE_EN 0x1 + +#define CORE_POWER 0x0 +#define CORE_SW_RST BIT(7) + +#define CORE_PWRCTL_STATUS 0xdc +#define CORE_PWRCTL_MASK 0xe0 +#define CORE_PWRCTL_CLEAR 0xe4 +#define CORE_PWRCTL_CTL 0xe8 + +#define CORE_PWRCTL_BUS_OFF BIT(0) +#define CORE_PWRCTL_BUS_ON BIT(1) +#define CORE_PWRCTL_IO_LOW BIT(2) +#define CORE_PWRCTL_IO_HIGH BIT(3) + +#define CORE_PWRCTL_BUS_SUCCESS BIT(0) +#define CORE_PWRCTL_BUS_FAIL BIT(1) +#define CORE_PWRCTL_IO_SUCCESS BIT(2) +#define CORE_PWRCTL_IO_FAIL BIT(3) + +#define INT_MASK 0xf + + +/* This structure keeps information per regulator */ +struct sdhci_msm_reg_data { + struct regulator *reg; + const char *name; + /* Voltage level values */ + u32 low_vol_level; + u32 high_vol_level; +}; + +struct sdhci_msm_pltfm_data { + u32 caps; /* Supported UHS-I Modes */ + u32 caps2; /* More capabilities */ + struct sdhci_msm_reg_data vdd; /* VDD/VCC regulator info */ + struct sdhci_msm_reg_data vdd_io; /* VDD IO regulator info */ +}; + +struct sdhci_msm_host { + struct platform_device *pdev; + void __iomem *core_mem; /* MSM SDCC mapped address */ + int pwr_irq; /* power irq */ + struct clk *clk; /* main SD/MMC bus clock */ + struct clk *pclk; /* SDHC peripheral bus clock */ + struct clk *bus_clk; /* SDHC bus voter clock */ + struct sdhci_msm_pltfm_data pdata; + struct mmc_host *mmc; + struct sdhci_pltfm_data sdhci_msm_pdata; +}; + +/* MSM platform specific tuning */ +int sdhci_msm_execute_tuning(struct sdhci_host *host, u32 opcode) +{ + /* + * Tuning is required for SDR104, HS200 and HS400 cards and if the clock + * frequency greater than 100MHz in those modes. The standard tuning + * procedure should not be executed, but a custom implementation will be + * added here instead. + */ + return 0; +} + +#define MAX_PROP_SIZE 32 +static int sdhci_msm_dt_parse_vreg_info(struct device *dev, + struct sdhci_msm_reg_data *vreg, const char *vreg_name) +{ + char prop_name[MAX_PROP_SIZE]; + struct device_node *np = dev->of_node; + + vreg->name = vreg_name; + + snprintf(prop_name, MAX_PROP_SIZE, "qcom,%s-voltage-min", vreg_name); + of_property_read_u32(np, prop_name, &vreg->low_vol_level); + snprintf(prop_name, MAX_PROP_SIZE, "qcom,%s-voltage-max", vreg_name); + of_property_read_u32(np, prop_name, &vreg->high_vol_level); + + /* Sanity check */ + if (vreg->low_vol_level > vreg->high_vol_level) { + dev_err(dev, "%s Invalid constraints specified\n", vreg->name); + return -EINVAL; + } + + return 0; +} + +/* Parse devicetree data */ +static int sdhci_msm_populate_pdata(struct device *dev, + struct sdhci_msm_pltfm_data *pdata) +{ + if (sdhci_msm_dt_parse_vreg_info(dev, &pdata->vdd, "vdd")) { + dev_err(dev, "Failed parsing vdd data\n"); + return -EINVAL; + } + + if (sdhci_msm_dt_parse_vreg_info(dev, &pdata->vdd_io, "vdd-io")) { + dev_err(dev, "Failed parsing vdd-io data\n"); + return -EINVAL; + } + + return 0; +} + +static int sdhci_msm_vreg_enable(struct device *dev, + struct sdhci_msm_reg_data *vreg) +{ + int ret = 0; + + if (!regulator_is_enabled(vreg->reg)) { + /* Set voltage level */ + ret = regulator_set_voltage(vreg->reg, vreg->high_vol_level, + vreg->high_vol_level); + if (ret) + return ret; + } + + ret = regulator_enable(vreg->reg); + if (ret) { + dev_err(dev, "Failed to enable regulator %s (%d)\n", + vreg->name, ret); + } + + return ret; +} + +static int sdhci_msm_vreg_disable(struct device *dev, + struct sdhci_msm_reg_data *vreg) +{ + int ret = 0; + + if (!regulator_is_enabled(vreg->reg)) + return ret; + + /* Set min. voltage to 0 */ + ret = regulator_set_voltage(vreg->reg, 0, vreg->high_vol_level); + if (ret) + return ret; + + ret = regulator_disable(vreg->reg); + if (ret) { + dev_err(dev, "Failed to disable regulator %s (%d)\n", + vreg->name, ret); + } + + return ret; +} + +static int sdhci_msm_setup_vreg(struct sdhci_msm_host *msm_host, bool enable) +{ + int ret, i; + struct sdhci_msm_reg_data *vreg_table[2]; + + vreg_table[0] = &msm_host->pdata.vdd; + vreg_table[1] = &msm_host->pdata.vdd_io; + + for (i = 0; i < ARRAY_SIZE(vreg_table); i++) { + if (enable) + ret = sdhci_msm_vreg_enable(&msm_host->pdev->dev, + vreg_table[i]); + else + ret = sdhci_msm_vreg_disable(&msm_host->pdev->dev, + vreg_table[i]); + if (ret) + return ret; + } + + return 0; +} + +static int sdhci_msm_vreg_init(struct device *dev, + struct sdhci_msm_pltfm_data *pdata) +{ + struct sdhci_msm_reg_data *vdd_reg = &pdata->vdd; + struct sdhci_msm_reg_data *vdd_io_reg = &pdata->vdd_io; + + vdd_reg->reg = devm_regulator_get(dev, vdd_reg->name); + if (IS_ERR(vdd_reg->reg)) + return PTR_ERR(vdd_reg->reg); + + vdd_io_reg->reg = devm_regulator_get(dev, vdd_io_reg->name); + if (IS_ERR(vdd_io_reg->reg)) + return PTR_ERR(vdd_io_reg->reg); + + return 0; +} + +static irqreturn_t sdhci_msm_pwr_irq(int irq, void *data) +{ + struct sdhci_host *host = (struct sdhci_host *)data; + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct sdhci_msm_host *msm_host = pltfm_host->priv; + u8 irq_status; + u8 irq_ack = 0; + int ret = 0; + + irq_status = readb_relaxed(msm_host->core_mem + CORE_PWRCTL_STATUS); + dev_dbg(mmc_dev(msm_host->mmc), "%s: Received IRQ(%d), status=0x%x\n", + mmc_hostname(msm_host->mmc), irq, irq_status); + + /* Clear the interrupt */ + writeb_relaxed(irq_status, (msm_host->core_mem + CORE_PWRCTL_CLEAR)); + /* + * SDHC has core_mem and hc_mem device memory and these memory + * addresses do not fall within 1KB region. Hence, any update to + * core_mem address space would require an mb() to ensure this gets + * completed before its next update to registers within hc_mem. + */ + mb(); + + /* Handle BUS ON/OFF */ + if (irq_status & CORE_PWRCTL_BUS_ON) { + ret = sdhci_msm_setup_vreg(msm_host, true); + if (!ret) + ret = regulator_set_voltage(msm_host->pdata.vdd_io.reg, + msm_host->pdata. + vdd_io.high_vol_level, + msm_host->pdata. + vdd_io.high_vol_level); + if (ret) + irq_ack |= CORE_PWRCTL_BUS_FAIL; + else + irq_ack |= CORE_PWRCTL_BUS_SUCCESS; + } + + if (irq_status & CORE_PWRCTL_BUS_OFF) { + ret = sdhci_msm_setup_vreg(msm_host, false); + if (!ret) + ret = regulator_set_voltage(msm_host->pdata.vdd_io.reg, + msm_host->pdata. + vdd_io.low_vol_level, + msm_host->pdata. + vdd_io.low_vol_level); + if (ret) + irq_ack |= CORE_PWRCTL_BUS_FAIL; + else + irq_ack |= CORE_PWRCTL_BUS_SUCCESS; + } + + /* Handle IO LOW/HIGH */ + if (irq_status & CORE_PWRCTL_IO_LOW) { + ret = regulator_set_voltage(msm_host->pdata.vdd_io.reg, + msm_host->pdata. + vdd_io.low_vol_level, + msm_host->pdata. + vdd_io.low_vol_level); + if (ret) + irq_ack |= CORE_PWRCTL_IO_FAIL; + else + irq_ack |= CORE_PWRCTL_IO_SUCCESS; + } + + if (irq_status & CORE_PWRCTL_IO_HIGH) { + ret = regulator_set_voltage(msm_host->pdata.vdd_io.reg, + msm_host->pdata. + vdd_io.high_vol_level, + msm_host->pdata. + vdd_io.high_vol_level); + if (ret) + irq_ack |= CORE_PWRCTL_IO_FAIL; + else + irq_ack |= CORE_PWRCTL_IO_SUCCESS; + } + + /* ACK status to the core */ + writeb_relaxed(irq_ack, (msm_host->core_mem + CORE_PWRCTL_CTL)); + /* + * SDHC has core_mem and hc_mem device memory and these memory + * addresses do not fall within 1KB region. Hence, any update to + * core_mem address space would require an mb() to ensure this gets + * completed before its next update to registers within hc_mem. + */ + mb(); + + dev_dbg(mmc_dev(msm_host->mmc), "%s: Handled IRQ(%d), ret=%d, ack=0x%x\n", + mmc_hostname(msm_host->mmc), irq, ret, irq_ack); + return IRQ_HANDLED; +} + +static const struct of_device_id sdhci_msm_dt_match[] = { + { .compatible = "qcom,sdhci-msm-v4" }, + {}, +}; + +MODULE_DEVICE_TABLE(of, sdhci_msm_dt_match); + +static struct sdhci_ops sdhci_msm_ops = { + .platform_execute_tuning = sdhci_msm_execute_tuning, +}; + +static int sdhci_msm_probe(struct platform_device *pdev) +{ + struct sdhci_host *host; + struct sdhci_pltfm_host *pltfm_host; + struct sdhci_msm_host *msm_host; + struct resource *core_memres = NULL; + int ret, dead; + u16 host_version; + + if (!pdev->dev.of_node) { + dev_err(&pdev->dev, "No device tree data\n"); + return -ENOENT; + } + + msm_host = devm_kzalloc(&pdev->dev, sizeof(*msm_host), GFP_KERNEL); + if (!msm_host) + return -ENOMEM; + + msm_host->sdhci_msm_pdata.ops = &sdhci_msm_ops; + host = sdhci_pltfm_init(pdev, &msm_host->sdhci_msm_pdata, 0); + if (IS_ERR(host)) + return PTR_ERR(host); + + pltfm_host = sdhci_priv(host); + pltfm_host->priv = msm_host; + msm_host->mmc = host->mmc; + msm_host->pdev = pdev; + + ret = mmc_of_parse(host->mmc); + if (ret) { + dev_err(&pdev->dev, "Failed parsing mmc device tree\n"); + goto pltfm_free; + } + + sdhci_get_of_property(pdev); + + ret = sdhci_msm_populate_pdata(&pdev->dev, &msm_host->pdata); + if (ret) { + dev_err(&pdev->dev, "DT parsing error\n"); + goto pltfm_free; + } + + /* Setup SDCC bus voter clock. */ + msm_host->bus_clk = devm_clk_get(&pdev->dev, "bus"); + if (!IS_ERR(msm_host->bus_clk)) { + /* Vote for max. clk rate for max. performance */ + ret = clk_set_rate(msm_host->bus_clk, INT_MAX); + if (ret) + goto pltfm_free; + ret = clk_prepare_enable(msm_host->bus_clk); + if (ret) + goto pltfm_free; + } + + /* Setup main peripheral bus clock */ + msm_host->pclk = devm_clk_get(&pdev->dev, "iface"); + if (!IS_ERR(msm_host->pclk)) { + ret = clk_prepare_enable(msm_host->pclk); + if (ret) { + dev_err(&pdev->dev, + "Peripheral clock setup failed (%d)\n", ret); + goto bus_clk_disable; + } + } + + /* Setup SDC MMC clock */ + msm_host->clk = devm_clk_get(&pdev->dev, "core"); + if (IS_ERR(msm_host->clk)) { + ret = PTR_ERR(msm_host->clk); + dev_err(&pdev->dev, "SDC MMC clock setup failed (%d)\n", ret); + goto pclk_disable; + } + + ret = clk_prepare_enable(msm_host->clk); + if (ret) + goto pclk_disable; + + /* Setup regulators */ + ret = sdhci_msm_vreg_init(&pdev->dev, &msm_host->pdata); + if (ret) { + if (ret != -EPROBE_DEFER) + dev_err(&pdev->dev, + "Regulator setup failed (%d)\n", ret); + goto clk_disable; + } + + core_memres = platform_get_resource_byname(pdev, + IORESOURCE_MEM, "core_mem"); + msm_host->core_mem = devm_ioremap_resource(&pdev->dev, core_memres); + + if (IS_ERR(msm_host->core_mem)) { + dev_err(&pdev->dev, "Failed to remap registers\n"); + ret = PTR_ERR(msm_host->core_mem); + goto vreg_disable; + } + + /* Reset the core and Enable SDHC mode */ + writel_relaxed(readl_relaxed(msm_host->core_mem + CORE_POWER) | + CORE_SW_RST, msm_host->core_mem + CORE_POWER); + + /* SW reset can take upto 10HCLK + 15MCLK cycles. (min 40us) */ + usleep_range(1000, 5000); + if (readl(msm_host->core_mem + CORE_POWER) & CORE_SW_RST) { + dev_err(&pdev->dev, "Stuck in reset\n"); + ret = -ETIMEDOUT; + goto vreg_disable; + } + + /* Set HC_MODE_EN bit in HC_MODE register */ + writel_relaxed(HC_MODE_EN, (msm_host->core_mem + CORE_HC_MODE)); + + /* + * Following are the deviations from SDHC spec v3.0 - + * 1. Card detection is handled using separate GPIO. + * 2. Bus power control is handled by interacting with PMIC. + */ + host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION; + host->quirks |= SDHCI_QUIRK_SINGLE_POWER_WRITE; + + host_version = readw_relaxed((host->ioaddr + SDHCI_HOST_VERSION)); + dev_dbg(&pdev->dev, "Host Version: 0x%x Vendor Version 0x%x\n", + host_version, ((host_version & SDHCI_VENDOR_VER_MASK) >> + SDHCI_VENDOR_VER_SHIFT)); + + /* Setup PWRCTL irq */ + msm_host->pwr_irq = platform_get_irq_byname(pdev, "pwr_irq"); + if (msm_host->pwr_irq < 0) { + dev_err(&pdev->dev, "Failed to get pwr_irq by name (%d)\n", + msm_host->pwr_irq); + goto vreg_disable; + } + ret = devm_request_threaded_irq(&pdev->dev, msm_host->pwr_irq, NULL, + sdhci_msm_pwr_irq, IRQF_ONESHOT, + dev_name(&pdev->dev), host); + if (ret) { + dev_err(&pdev->dev, "Request threaded irq(%d) failed (%d)\n", + msm_host->pwr_irq, ret); + goto vreg_disable; + } + + /* Enable pwr irq interrupts */ + writel_relaxed(INT_MASK, (msm_host->core_mem + CORE_PWRCTL_MASK)); + + msm_host->mmc->caps |= msm_host->pdata.caps; + msm_host->mmc->caps2 |= msm_host->pdata.caps2; + + ret = sdhci_add_host(host); + if (ret) { + dev_err(&pdev->dev, "Add host failed (%d)\n", ret); + goto vreg_disable; + } + + ret = clk_set_rate(msm_host->clk, host->max_clk); + if (ret) { + dev_err(&pdev->dev, "MClk rate set failed (%d)\n", ret); + goto remove_host; + } + + return 0; + +remove_host: + dead = (readl_relaxed(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff); + sdhci_remove_host(host, dead); +vreg_disable: + if (!IS_ERR(msm_host->pdata.vdd.reg)) + sdhci_msm_vreg_disable(&pdev->dev, &msm_host->pdata.vdd); + if (!IS_ERR(msm_host->pdata.vdd_io.reg)) + sdhci_msm_vreg_disable(&pdev->dev, &msm_host->pdata.vdd_io); +clk_disable: + if (!IS_ERR(msm_host->clk)) + clk_disable_unprepare(msm_host->clk); +pclk_disable: + if (!IS_ERR(msm_host->pclk)) + clk_disable_unprepare(msm_host->pclk); +bus_clk_disable: + if (!IS_ERR(msm_host->bus_clk)) + clk_disable_unprepare(msm_host->bus_clk); +pltfm_free: + sdhci_pltfm_free(pdev); + return ret; +} + +static int sdhci_msm_remove(struct platform_device *pdev) +{ + struct sdhci_host *host = platform_get_drvdata(pdev); + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct sdhci_msm_host *msm_host = pltfm_host->priv; + int dead = (readl_relaxed(host->ioaddr + SDHCI_INT_STATUS) == + 0xffffffff); + + sdhci_remove_host(host, dead); + sdhci_pltfm_free(pdev); + sdhci_msm_vreg_disable(&pdev->dev, &msm_host->pdata.vdd); + sdhci_msm_vreg_disable(&pdev->dev, &msm_host->pdata.vdd_io); + clk_disable_unprepare(msm_host->clk); + clk_disable_unprepare(msm_host->pclk); + if (!IS_ERR(msm_host->bus_clk)) + clk_disable_unprepare(msm_host->bus_clk); + return 0; +} + +static struct platform_driver sdhci_msm_driver = { + .probe = sdhci_msm_probe, + .remove = sdhci_msm_remove, + .driver = { + .name = "sdhci_msm", + .owner = THIS_MODULE, + .of_match_table = sdhci_msm_dt_match, + }, +}; + +module_platform_driver(sdhci_msm_driver); + +MODULE_DESCRIPTION("Qualcomm Secure Digital Host Controller Interface driver"); +MODULE_LICENSE("GPL v2"); -- 1.7.9.5 -- 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/