274 lines
7.1 KiB
C
274 lines
7.1 KiB
C
/*
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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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* 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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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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/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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};
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#ifdef CONFIG_OF
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static bool sdhci_of_wp_inverted(struct device_node *np)
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{
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if (of_get_property(np, "sdhci,wp-inverted", NULL) ||
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of_get_property(np, "wp-inverted", NULL))
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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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void sdhci_get_of_property(struct platform_device *pdev)
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{
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struct device_node *np = pdev->dev.of_node;
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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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const __be32 *clk;
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u32 bus_width;
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int size;
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if (of_device_is_available(np)) {
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if (of_get_property(np, "sdhci,auto-cmd12", NULL))
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host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12;
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if (of_get_property(np, "sdhci,1-bit-only", NULL) ||
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(of_property_read_u32(np, "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_of_wp_inverted(np))
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host->quirks |= SDHCI_QUIRK_INVERTED_WRITE_PROTECT;
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if (of_get_property(np, "broken-cd", NULL))
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host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION;
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if (of_get_property(np, "no-1-8-v", NULL))
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host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V;
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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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clk = of_get_property(np, "clock-frequency", &size);
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if (clk && size == sizeof(*clk) && *clk)
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pltfm_host->clock = be32_to_cpup(clk);
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if (of_find_property(np, "keep-power-in-suspend", NULL))
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host->mmc->pm_caps |= MMC_PM_KEEP_POWER;
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if (of_find_property(np, "enable-sdio-wakeup", NULL))
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host->mmc->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
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}
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}
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#else
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void sdhci_get_of_property(struct platform_device *pdev) {}
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#endif /* CONFIG_OF */
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EXPORT_SYMBOL_GPL(sdhci_get_of_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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{
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struct sdhci_host *host;
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struct sdhci_pltfm_host *pltfm_host;
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struct device_node *np = pdev->dev.of_node;
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struct resource *iomem;
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int ret;
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iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!iomem) {
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ret = -ENOMEM;
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goto err;
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}
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if (resource_size(iomem) < 0x100)
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dev_err(&pdev->dev, "Invalid iomem size!\n");
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/* Some PCI-based MFD need the parent here */
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if (pdev->dev.parent != &platform_bus && !np)
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host = sdhci_alloc_host(pdev->dev.parent, sizeof(*pltfm_host));
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else
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host = sdhci_alloc_host(&pdev->dev, sizeof(*pltfm_host));
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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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pltfm_host = sdhci_priv(host);
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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->irq = platform_get_irq(pdev, 0);
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if (!request_mem_region(iomem->start, resource_size(iomem),
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mmc_hostname(host->mmc))) {
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dev_err(&pdev->dev, "cannot request region\n");
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ret = -EBUSY;
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goto err_request;
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}
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host->ioaddr = ioremap(iomem->start, resource_size(iomem));
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if (!host->ioaddr) {
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dev_err(&pdev->dev, "failed to remap registers\n");
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ret = -ENOMEM;
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goto err_remap;
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}
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/*
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* Some platforms need to probe the controller to be able to
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* determine which caps should be used.
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*/
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if (host->ops && host->ops->platform_init)
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host->ops->platform_init(host);
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platform_set_drvdata(pdev, host);
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return host;
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err_remap:
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release_mem_region(iomem->start, resource_size(iomem));
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err_request:
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sdhci_free_host(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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struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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iounmap(host->ioaddr);
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release_mem_region(iomem->start, resource_size(iomem));
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sdhci_free_host(host);
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platform_set_drvdata(pdev, NULL);
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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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{
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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);
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if (IS_ERR(host))
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return PTR_ERR(host);
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sdhci_get_of_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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int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
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sdhci_remove_host(host, dead);
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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
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static 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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return sdhci_suspend_host(host);
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}
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static 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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return sdhci_resume_host(host);
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}
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const struct dev_pm_ops sdhci_pltfm_pmops = {
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.suspend = sdhci_pltfm_suspend,
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.resume = sdhci_pltfm_resume,
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};
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EXPORT_SYMBOL_GPL(sdhci_pltfm_pmops);
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#endif /* CONFIG_PM */
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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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