271 lines
6.5 KiB
C
271 lines
6.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* sdhci-pltfm.c Support for SDHCI platform devices
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* Copyright (c) 2009 Intel Corporation
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*
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* Copyright (c) 2007, 2011 Freescale Semiconductor, Inc.
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* Copyright (c) 2009 MontaVista Software, Inc.
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*
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* Authors: Xiaobo Xie <X.Xie@freescale.com>
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* Anton Vorontsov <avorontsov@ru.mvista.com>
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*/
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/* Supports:
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* SDHCI platform devices
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*
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* Inspired by sdhci-pci.c, by Pierre Ossman
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*/
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/property.h>
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#include <linux/of.h>
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#ifdef CONFIG_PPC
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#include <asm/machdep.h>
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#endif
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#include "sdhci-pltfm.h"
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unsigned int sdhci_pltfm_clk_get_max_clock(struct sdhci_host *host)
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{
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struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
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return clk_get_rate(pltfm_host->clk);
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}
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EXPORT_SYMBOL_GPL(sdhci_pltfm_clk_get_max_clock);
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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 bool sdhci_wp_inverted(struct device *dev)
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{
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if (device_property_present(dev, "sdhci,wp-inverted") ||
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device_property_present(dev, "wp-inverted"))
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return true;
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/* Old device trees don't have the wp-inverted property. */
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#ifdef CONFIG_PPC
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return machine_is(mpc837x_rdb) || machine_is(mpc837x_mds);
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#else
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return false;
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#endif /* CONFIG_PPC */
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}
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#ifdef CONFIG_OF
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static void sdhci_get_compatibility(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 device_node *np = pdev->dev.of_node;
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if (!np)
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return;
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if (of_device_is_compatible(np, "fsl,p2020-rev1-esdhc"))
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host->quirks |= SDHCI_QUIRK_BROKEN_DMA;
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if (of_device_is_compatible(np, "fsl,p2020-esdhc") ||
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of_device_is_compatible(np, "fsl,p1010-esdhc") ||
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of_device_is_compatible(np, "fsl,t4240-esdhc") ||
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of_device_is_compatible(np, "fsl,mpc8536-esdhc"))
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host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;
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}
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#else
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void sdhci_get_compatibility(struct platform_device *pdev) {}
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#endif /* CONFIG_OF */
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void sdhci_get_property(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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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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u32 bus_width;
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if (device_property_present(dev, "sdhci,auto-cmd12"))
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host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12;
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if (device_property_present(dev, "sdhci,1-bit-only") ||
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(device_property_read_u32(dev, "bus-width", &bus_width) == 0 &&
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bus_width == 1))
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host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA;
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if (sdhci_wp_inverted(dev))
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host->quirks |= SDHCI_QUIRK_INVERTED_WRITE_PROTECT;
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if (device_property_present(dev, "broken-cd"))
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host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION;
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if (device_property_present(dev, "no-1-8-v"))
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host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V;
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sdhci_get_compatibility(pdev);
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device_property_read_u32(dev, "clock-frequency", &pltfm_host->clock);
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if (device_property_present(dev, "keep-power-in-suspend"))
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host->mmc->pm_caps |= MMC_PM_KEEP_POWER;
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if (device_property_read_bool(dev, "wakeup-source") ||
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device_property_read_bool(dev, "enable-sdio-wakeup")) /* legacy */
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host->mmc->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
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}
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EXPORT_SYMBOL_GPL(sdhci_get_property);
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struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev,
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const struct sdhci_pltfm_data *pdata,
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size_t priv_size)
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{
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struct sdhci_host *host;
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struct resource *iomem;
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void __iomem *ioaddr;
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int irq, ret;
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iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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ioaddr = devm_ioremap_resource(&pdev->dev, iomem);
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if (IS_ERR(ioaddr)) {
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ret = PTR_ERR(ioaddr);
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goto err;
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}
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irq = platform_get_irq(pdev, 0);
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if (irq < 0) {
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dev_err(&pdev->dev, "failed to get IRQ number\n");
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ret = irq;
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goto err;
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}
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host = sdhci_alloc_host(&pdev->dev,
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sizeof(struct sdhci_pltfm_host) + priv_size);
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if (IS_ERR(host)) {
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ret = PTR_ERR(host);
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goto err;
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}
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host->ioaddr = ioaddr;
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host->irq = irq;
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host->hw_name = dev_name(&pdev->dev);
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if (pdata && pdata->ops)
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host->ops = pdata->ops;
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else
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host->ops = &sdhci_pltfm_ops;
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if (pdata) {
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host->quirks = pdata->quirks;
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host->quirks2 = pdata->quirks2;
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}
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platform_set_drvdata(pdev, host);
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return host;
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err:
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dev_err(&pdev->dev, "%s failed %d\n", __func__, ret);
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return ERR_PTR(ret);
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}
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EXPORT_SYMBOL_GPL(sdhci_pltfm_init);
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void sdhci_pltfm_free(struct platform_device *pdev)
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{
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struct sdhci_host *host = platform_get_drvdata(pdev);
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sdhci_free_host(host);
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}
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EXPORT_SYMBOL_GPL(sdhci_pltfm_free);
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int sdhci_pltfm_register(struct platform_device *pdev,
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const struct sdhci_pltfm_data *pdata,
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size_t priv_size)
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{
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struct sdhci_host *host;
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int ret = 0;
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host = sdhci_pltfm_init(pdev, pdata, priv_size);
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if (IS_ERR(host))
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return PTR_ERR(host);
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sdhci_get_property(pdev);
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ret = sdhci_add_host(host);
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if (ret)
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sdhci_pltfm_free(pdev);
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return ret;
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}
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EXPORT_SYMBOL_GPL(sdhci_pltfm_register);
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int sdhci_pltfm_unregister(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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int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
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sdhci_remove_host(host, dead);
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clk_disable_unprepare(pltfm_host->clk);
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sdhci_pltfm_free(pdev);
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return 0;
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}
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EXPORT_SYMBOL_GPL(sdhci_pltfm_unregister);
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#ifdef CONFIG_PM_SLEEP
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int sdhci_pltfm_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;
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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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return ret;
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clk_disable_unprepare(pltfm_host->clk);
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return 0;
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}
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EXPORT_SYMBOL_GPL(sdhci_pltfm_suspend);
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int sdhci_pltfm_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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int ret;
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ret = clk_prepare_enable(pltfm_host->clk);
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if (ret)
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return ret;
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ret = sdhci_resume_host(host);
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if (ret)
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clk_disable_unprepare(pltfm_host->clk);
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return ret;
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}
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EXPORT_SYMBOL_GPL(sdhci_pltfm_resume);
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#endif
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const struct dev_pm_ops sdhci_pltfm_pmops = {
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SET_SYSTEM_SLEEP_PM_OPS(sdhci_pltfm_suspend, sdhci_pltfm_resume)
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};
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EXPORT_SYMBOL_GPL(sdhci_pltfm_pmops);
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static int __init sdhci_pltfm_drv_init(void)
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{
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pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n");
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return 0;
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}
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module_init(sdhci_pltfm_drv_init);
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static void __exit sdhci_pltfm_drv_exit(void)
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{
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}
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module_exit(sdhci_pltfm_drv_exit);
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MODULE_DESCRIPTION("SDHCI platform and OF driver helper");
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MODULE_AUTHOR("Intel Corporation");
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MODULE_LICENSE("GPL v2");
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