From patchwork Thu May 22 15:18:15 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Griffin X-Patchwork-Id: 4223791 Return-Path: X-Original-To: patchwork-linux-mmc@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 8876F9F23C for ; Thu, 22 May 2014 15:20:59 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id D9C2B20379 for ; Thu, 22 May 2014 15:20:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DE78D2037D for ; Thu, 22 May 2014 15:20:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751946AbaEVPSo (ORCPT ); Thu, 22 May 2014 11:18:44 -0400 Received: from mail-we0-f178.google.com ([74.125.82.178]:43882 "EHLO mail-we0-f178.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751583AbaEVPSl (ORCPT ); Thu, 22 May 2014 11:18:41 -0400 Received: by mail-we0-f178.google.com with SMTP id u56so3607990wes.9 for ; Thu, 22 May 2014 08:18:40 -0700 (PDT) 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; bh=p1qMHYDfS/HW6dTPZBSnlDJSspUk9S5ybbKVjVHC/9Q=; b=fnxmv/jZgt+0MqPy3bPgHXg9TvlLTttlMmAAAJTZT3QS9Vc8MGgny+1aF9O5E10tBX YNFnPY4DC3Knw30KCidNkBRRPD3d6I9GWITx6VXQDUGg3APYh9JB+DoucNz/6M0Coow5 sv0J8um2SKjLmdg2UFZhHM7xigtm2jf5dQyN9I03cK4mbn7HeHIKYkAZRGXGuBlqkSY8 bBQTwLi4dKecC3LB8F5I+8vicilgAuu9NywKXv5M/jH6Bun9XqEPKlUclgOylqfO6qaW BAhs0+7URB6WVGsNfyc+gz+Jh1EBURZhrFO6HSKKp+UHLTrAnI2NBx1wQ4ID/FUs1PlV SCqw== X-Gm-Message-State: ALoCoQkm9VgDXWvtqSqQA2ngw9DohxcdmavF9fVwNK+bmsGf6CvreExUMlaGPyb6rppBVvyPdpn2 X-Received: by 10.180.82.133 with SMTP id i5mr17194000wiy.50.1400771920274; Thu, 22 May 2014 08:18:40 -0700 (PDT) Received: from localhost.localdomain (cpc14-aztw22-2-0-cust189.18-1.cable.virginm.net. [82.45.1.190]) by mx.google.com with ESMTPSA id dk4sm848205wib.14.2014.05.22.08.18.39 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Thu, 22 May 2014 08:18:39 -0700 (PDT) From: Peter Griffin To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, maxime.coquelin@st.com, patrice.chotard@st.com, srinivas.kandagatla@gmail.com, chris@printf.net, ulf.hansson@linaro.org Cc: peter.griffin@linaro.org, kernel@stlinux.com, lee.jones@linaro.org, linux-mmc@vger.kernel.org, devicetree@vger.kernel.org, Giuseppe Cavallaro Subject: [PATCH 1/8] mmc: sdhci-st: Intial support for ST SDHCI controller Date: Thu, 22 May 2014 16:18:15 +0100 Message-Id: <1400771902-26553-2-git-send-email-peter.griffin@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1400771902-26553-1-git-send-email-peter.griffin@linaro.org> References: <1400771902-26553-1-git-send-email-peter.griffin@linaro.org> Sender: linux-mmc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org X-Spam-Status: No, score=-7.5 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable 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 This platform driver adds initial support for the SDHCI host controller found on STMicroelectronics SoCs. It has been tested on STiH41x b2020 platforms currently. Signed-off-by: Peter Griffin Signed-off-by: Giuseppe Cavallaro --- drivers/mmc/host/Kconfig | 12 +++ drivers/mmc/host/Makefile | 1 + drivers/mmc/host/sdhci-st.c | 244 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 257 insertions(+) create mode 100644 drivers/mmc/host/sdhci-st.c diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig index 8aaf8c1..b62c40d 100644 --- a/drivers/mmc/host/Kconfig +++ b/drivers/mmc/host/Kconfig @@ -283,6 +283,18 @@ config MMC_SDHCI_BCM2835 If unsure, say N. +config MMC_SDHCI_ST + tristate "SDHCI support on STMicroelectronics SoC" + depends on ARCH_STI + depends on MMC_SDHCI_PLTFM + select MMC_SDHCI_IO_ACCESSORS + help + This selects the Secure Digital Host Controller Interface in + STMicroelectronics SoCs. + + If you have a controller with this interface, say Y or M here. + If unsure, say N. + config MMC_OMAP tristate "TI OMAP Multimedia Card Interface support" depends on ARCH_OMAP diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile index 0c8aa5e..6e0acf7 100644 --- a/drivers/mmc/host/Makefile +++ b/drivers/mmc/host/Makefile @@ -64,6 +64,7 @@ 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 +obj-$(CONFIG_MMC_SDHCI_ST) += sdhci-st.o ifeq ($(CONFIG_CB710_DEBUG),y) CFLAGS-cb710-mmc += -DDEBUG diff --git a/drivers/mmc/host/sdhci-st.c b/drivers/mmc/host/sdhci-st.c new file mode 100644 index 0000000..1790fa7 --- /dev/null +++ b/drivers/mmc/host/sdhci-st.c @@ -0,0 +1,244 @@ +/* + * Support for SDHCI on STMicroelectronics SoCs + * + * Copyright (C) 2014 STMicroelectronics Ltd + * Author: Giuseppe Cavallaro + * + * Based on sdhci-cns3xxx.c + * + * 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 "sdhci-pltfm.h" + +struct st_mmc_platform_data { + struct reset_control *rstc; +}; + +static int sdhci_st_8bit_width(struct sdhci_host *host, int width) +{ + u8 ctrl; + + ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL); + + switch (width) { + case MMC_BUS_WIDTH_8: + ctrl |= SDHCI_CTRL_8BITBUS; + ctrl &= ~SDHCI_CTRL_4BITBUS; + break; + case MMC_BUS_WIDTH_4: + ctrl |= SDHCI_CTRL_4BITBUS; + ctrl &= ~SDHCI_CTRL_8BITBUS; + break; + default: + ctrl &= ~(SDHCI_CTRL_8BITBUS | SDHCI_CTRL_4BITBUS); + break; + } + + sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); + + return 0; +} + +static unsigned int sdhci_st_get_max_clk(struct sdhci_host *host) +{ + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + + return clk_get_rate(pltfm_host->clk); +} + +static u32 sdhci_st_readl(struct sdhci_host *host, int reg) +{ + u32 ret; + + switch (reg) { + case SDHCI_CAPABILITIES: + ret = readl(host->ioaddr + reg); + /* Support 3.3V and 1.8V */ + ret &= ~SDHCI_CAN_VDD_300; + break; + default: + ret = readl(host->ioaddr + reg); + } + return ret; +} + +static const struct sdhci_ops sdhci_st_ops = { + .get_max_clock = sdhci_st_get_max_clk, + .platform_bus_width = sdhci_st_8bit_width, + .read_l = sdhci_st_readl, +}; + +static const struct sdhci_pltfm_data sdhci_st_pdata = { + .ops = &sdhci_st_ops, + .quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC | + SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN, +}; + + +static int sdhci_st_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + struct sdhci_host *host; + struct st_mmc_platform_data *pdata; + struct sdhci_pltfm_host *pltfm_host; + struct clk *clk; + int ret = 0; + u16 host_version; + + dev_dbg(&pdev->dev, "SDHCI ST platform driver\n"); + + pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) + return -ENOMEM; + + pdata->rstc = devm_reset_control_get(&pdev->dev, NULL); + if (IS_ERR(pdata->rstc)) + pdata->rstc = NULL; + else + reset_control_deassert(pdata->rstc); + + clk = devm_clk_get(&pdev->dev, "mmc"); + if (IS_ERR(clk)) { + dev_err(&pdev->dev, "Perpheral clk not found\n"); + return PTR_ERR(clk); + } + + host = sdhci_pltfm_init(pdev, &sdhci_st_pdata, 0); + if (IS_ERR(host)) { + dev_err(&pdev->dev, "Failed sdhci_pltfm_init\n"); + return PTR_ERR(host); + } + + clk_prepare_enable(clk); + + host->mmc->caps |= MMC_CAP_8_BIT_DATA | MMC_CAP_BUS_WIDTH_TEST + | MMC_CAP_1_8V_DDR; + + if (of_property_read_bool(np, "non-removable")) + host->mmc->caps |= MMC_CAP_NONREMOVABLE; + + pltfm_host = sdhci_priv(host); + pltfm_host->clk = clk; + + ret = sdhci_add_host(host); + if (ret) { + dev_err(&pdev->dev, "Failed sdhci_add_host\n"); + goto err_out; + } + + pltfm_host->priv = pdata; + + platform_set_drvdata(pdev, host); + + host_version = readw_relaxed((host->ioaddr + SDHCI_HOST_VERSION)); + + dev_dbg(&pdev->dev, "SDHCI ST Initialised: Host Version: 0x%x Vendor Version 0x%x\n", + host_version, ((host_version & SDHCI_VENDOR_VER_MASK) >> + SDHCI_VENDOR_VER_SHIFT)); + + return 0; + +err_out: + clk_disable_unprepare(clk); + sdhci_pltfm_free(pdev); + + return ret; +} + +static int sdhci_st_remove(struct platform_device *pdev) +{ + struct sdhci_host *host = platform_get_drvdata(pdev); + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct st_mmc_platform_data *pdata = pltfm_host->priv; + int ret; + + clk_disable_unprepare(pltfm_host->clk); + + ret = sdhci_pltfm_unregister(pdev); + + if (pdata->rstc) + reset_control_assert(pdata->rstc); + + return ret; +} + +#ifdef CONFIG_PM_SLEEP +static int sdhci_st_suspend(struct device *dev) +{ + struct sdhci_host *host = dev_get_drvdata(dev); + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct st_mmc_platform_data *pdata = pltfm_host->priv; + int ret = sdhci_suspend_host(host); + + if (ret) + goto out; + + if (pdata->rstc) + reset_control_assert(pdata->rstc); + + clk_disable_unprepare(pltfm_host->clk); +out: + return ret; +} + +static int sdhci_st_resume(struct device *dev) +{ + struct sdhci_host *host = dev_get_drvdata(dev); + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct st_mmc_platform_data *pdata = pltfm_host->priv; + + clk_prepare_enable(pltfm_host->clk); + + if (pdata->rstc) + reset_control_deassert(pdata->rstc); + + return sdhci_resume_host(host); +} + +static SIMPLE_DEV_PM_OPS(sdhci_st_pmops, sdhci_st_suspend, sdhci_st_resume); +#define SDHCI_ST_PMOPS (&sdhci_st_pmops) +#else +#define SDHCI_ST_PMOPS NULL +#endif + +static const struct of_device_id st_sdhci_match[] = { + { .compatible = "st,sdhci" }, + {}, +}; + +MODULE_DEVICE_TABLE(of, st_sdhci_match); + +static struct platform_driver sdhci_st_driver = { + .probe = sdhci_st_probe, + .remove = sdhci_st_remove, + .driver = { + .name = "sdhci-st", + .owner = THIS_MODULE, + .pm = SDHCI_ST_PMOPS, + .of_match_table = of_match_ptr(st_sdhci_match), + }, +}; + +module_platform_driver(sdhci_st_driver); + +MODULE_DESCRIPTION("SDHCI driver for STMicroelectronics SoCs"); +MODULE_AUTHOR("Giuseppe Cavallaro "); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:st-sdhci");