177 lines
4.1 KiB
C
177 lines
4.1 KiB
C
/*
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* Support for SDHCI on STMicroelectronics SoCs
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*
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* Copyright (C) 2014 STMicroelectronics Ltd
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* Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
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* Contributors: Peter Griffin <peter.griffin@linaro.org>
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*
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* Based on sdhci-cns3xxx.c
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/module.h>
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#include <linux/err.h>
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#include <linux/mmc/host.h>
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#include "sdhci-pltfm.h"
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static u32 sdhci_st_readl(struct sdhci_host *host, int reg)
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{
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u32 ret;
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switch (reg) {
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case SDHCI_CAPABILITIES:
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ret = readl_relaxed(host->ioaddr + reg);
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/* Support 3.3V and 1.8V */
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ret &= ~SDHCI_CAN_VDD_300;
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break;
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default:
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ret = readl_relaxed(host->ioaddr + reg);
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}
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return ret;
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}
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static const struct sdhci_ops sdhci_st_ops = {
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.get_max_clock = sdhci_pltfm_clk_get_max_clock,
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.set_clock = sdhci_set_clock,
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.set_bus_width = sdhci_set_bus_width,
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.read_l = sdhci_st_readl,
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.reset = sdhci_reset,
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};
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static const struct sdhci_pltfm_data sdhci_st_pdata = {
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.ops = &sdhci_st_ops,
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.quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC |
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SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
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};
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static int sdhci_st_probe(struct platform_device *pdev)
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{
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struct sdhci_host *host;
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struct sdhci_pltfm_host *pltfm_host;
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struct clk *clk;
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int ret = 0;
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u16 host_version;
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clk = devm_clk_get(&pdev->dev, "mmc");
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if (IS_ERR(clk)) {
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dev_err(&pdev->dev, "Peripheral clk not found\n");
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return PTR_ERR(clk);
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}
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host = sdhci_pltfm_init(pdev, &sdhci_st_pdata, 0);
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if (IS_ERR(host)) {
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dev_err(&pdev->dev, "Failed sdhci_pltfm_init\n");
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return PTR_ERR(host);
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}
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ret = mmc_of_parse(host->mmc);
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if (ret) {
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dev_err(&pdev->dev, "Failed mmc_of_parse\n");
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return ret;
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}
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clk_prepare_enable(clk);
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pltfm_host = sdhci_priv(host);
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pltfm_host->clk = clk;
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ret = sdhci_add_host(host);
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if (ret) {
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dev_err(&pdev->dev, "Failed sdhci_add_host\n");
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goto err_out;
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}
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platform_set_drvdata(pdev, host);
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host_version = readw_relaxed((host->ioaddr + SDHCI_HOST_VERSION));
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dev_info(&pdev->dev, "SDHCI ST Initialised: Host Version: 0x%x Vendor Version 0x%x\n",
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((host_version & SDHCI_SPEC_VER_MASK) >> SDHCI_SPEC_VER_SHIFT),
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((host_version & SDHCI_VENDOR_VER_MASK) >>
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SDHCI_VENDOR_VER_SHIFT));
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return 0;
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err_out:
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clk_disable_unprepare(clk);
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sdhci_pltfm_free(pdev);
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return ret;
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}
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static int sdhci_st_remove(struct platform_device *pdev)
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{
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struct sdhci_host *host = platform_get_drvdata(pdev);
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struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
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clk_disable_unprepare(pltfm_host->clk);
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return sdhci_pltfm_unregister(pdev);
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}
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#ifdef CONFIG_PM_SLEEP
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static int sdhci_st_suspend(struct device *dev)
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{
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struct sdhci_host *host = dev_get_drvdata(dev);
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struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
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int ret = sdhci_suspend_host(host);
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if (ret)
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goto out;
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clk_disable_unprepare(pltfm_host->clk);
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out:
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return ret;
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}
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static int sdhci_st_resume(struct device *dev)
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{
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struct sdhci_host *host = dev_get_drvdata(dev);
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struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
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clk_prepare_enable(pltfm_host->clk);
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return sdhci_resume_host(host);
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}
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#endif
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static SIMPLE_DEV_PM_OPS(sdhci_st_pmops, sdhci_st_suspend, sdhci_st_resume);
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static const struct of_device_id st_sdhci_match[] = {
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{ .compatible = "st,sdhci" },
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{},
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};
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MODULE_DEVICE_TABLE(of, st_sdhci_match);
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static struct platform_driver sdhci_st_driver = {
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.probe = sdhci_st_probe,
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.remove = sdhci_st_remove,
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.driver = {
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.name = "sdhci-st",
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.pm = &sdhci_st_pmops,
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.of_match_table = of_match_ptr(st_sdhci_match),
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},
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};
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module_platform_driver(sdhci_st_driver);
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MODULE_DESCRIPTION("SDHCI driver for STMicroelectronics SoCs");
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MODULE_AUTHOR("Giuseppe Cavallaro <peppe.cavallaro@st.com>");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:st-sdhci");
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