forked from Minki/linux
b007c4cec8
This driver is complicating things for no reason: the "cd" GPIO can easily be retrieved from the device tree if present using just mmc_gpiod_request_cd(), which will fetch the descriptor from the device tree using the standard binding just fine. Cc: Viresh Kumar <vireshk@kernel.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
198 lines
4.4 KiB
C
198 lines
4.4 KiB
C
/*
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* drivers/mmc/host/sdhci-spear.c
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*
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* Support of SDHCI platform devices for spear soc family
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*
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* Copyright (C) 2010 ST Microelectronics
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* Viresh Kumar <vireshk@kernel.org>
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*
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* Inspired by sdhci-pltfm.c
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/highmem.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/pm.h>
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#include <linux/slab.h>
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#include <linux/mmc/host.h>
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#include <linux/mmc/slot-gpio.h>
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#include <linux/io.h>
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#include "sdhci.h"
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struct spear_sdhci {
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struct clk *clk;
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};
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/* sdhci ops */
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static const struct sdhci_ops sdhci_pltfm_ops = {
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.set_clock = sdhci_set_clock,
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.set_bus_width = sdhci_set_bus_width,
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.reset = sdhci_reset,
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.set_uhs_signaling = sdhci_set_uhs_signaling,
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};
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static int sdhci_probe(struct platform_device *pdev)
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{
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struct sdhci_host *host;
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struct resource *iomem;
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struct spear_sdhci *sdhci;
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struct device *dev;
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int ret;
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dev = pdev->dev.parent ? pdev->dev.parent : &pdev->dev;
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host = sdhci_alloc_host(dev, sizeof(*sdhci));
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if (IS_ERR(host)) {
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ret = PTR_ERR(host);
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dev_dbg(&pdev->dev, "cannot allocate memory for sdhci\n");
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goto err;
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}
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iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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host->ioaddr = devm_ioremap_resource(&pdev->dev, iomem);
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if (IS_ERR(host->ioaddr)) {
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ret = PTR_ERR(host->ioaddr);
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dev_dbg(&pdev->dev, "unable to map iomem: %d\n", ret);
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goto err_host;
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}
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host->hw_name = "sdhci";
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host->ops = &sdhci_pltfm_ops;
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host->irq = platform_get_irq(pdev, 0);
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if (host->irq <= 0) {
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ret = -EINVAL;
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goto err_host;
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}
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host->quirks = SDHCI_QUIRK_BROKEN_ADMA;
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sdhci = sdhci_priv(host);
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/* clk enable */
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sdhci->clk = devm_clk_get(&pdev->dev, NULL);
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if (IS_ERR(sdhci->clk)) {
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ret = PTR_ERR(sdhci->clk);
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dev_dbg(&pdev->dev, "Error getting clock\n");
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goto err_host;
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}
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ret = clk_prepare_enable(sdhci->clk);
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if (ret) {
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dev_dbg(&pdev->dev, "Error enabling clock\n");
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goto err_host;
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}
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ret = clk_set_rate(sdhci->clk, 50000000);
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if (ret)
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dev_dbg(&pdev->dev, "Error setting desired clk, clk=%lu\n",
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clk_get_rate(sdhci->clk));
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/*
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* It is optional to use GPIOs for sdhci card detection. If we
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* find a descriptor using slot GPIO, we use it.
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*/
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ret = mmc_gpiod_request_cd(host->mmc, "cd", 0, false, 0, NULL);
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if (ret == -EPROBE_DEFER)
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goto disable_clk;
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ret = sdhci_add_host(host);
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if (ret)
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goto disable_clk;
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platform_set_drvdata(pdev, host);
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return 0;
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disable_clk:
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clk_disable_unprepare(sdhci->clk);
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err_host:
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sdhci_free_host(host);
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err:
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dev_err(&pdev->dev, "spear-sdhci probe failed: %d\n", ret);
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return ret;
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}
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static int sdhci_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 spear_sdhci *sdhci = sdhci_priv(host);
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int dead = 0;
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u32 scratch;
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scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
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if (scratch == (u32)-1)
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dead = 1;
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sdhci_remove_host(host, dead);
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clk_disable_unprepare(sdhci->clk);
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sdhci_free_host(host);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int sdhci_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 spear_sdhci *sdhci = sdhci_priv(host);
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int ret;
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if (host->tuning_mode != SDHCI_TUNING_MODE_3)
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mmc_retune_needed(host->mmc);
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ret = sdhci_suspend_host(host);
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if (!ret)
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clk_disable(sdhci->clk);
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return ret;
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}
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static int sdhci_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 spear_sdhci *sdhci = sdhci_priv(host);
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int ret;
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ret = clk_enable(sdhci->clk);
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if (ret) {
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dev_dbg(dev, "Resume: Error enabling clock\n");
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return ret;
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}
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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_pm_ops, sdhci_suspend, sdhci_resume);
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#ifdef CONFIG_OF
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static const struct of_device_id sdhci_spear_id_table[] = {
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{ .compatible = "st,spear300-sdhci" },
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{}
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};
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MODULE_DEVICE_TABLE(of, sdhci_spear_id_table);
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#endif
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static struct platform_driver sdhci_driver = {
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.driver = {
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.name = "sdhci",
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.pm = &sdhci_pm_ops,
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.of_match_table = of_match_ptr(sdhci_spear_id_table),
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},
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.probe = sdhci_probe,
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.remove = sdhci_remove,
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};
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module_platform_driver(sdhci_driver);
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MODULE_DESCRIPTION("SPEAr Secure Digital Host Controller Interface driver");
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MODULE_AUTHOR("Viresh Kumar <vireshk@kernel.org>");
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MODULE_LICENSE("GPL v2");
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