LXR linux/drivers/mmc/host/sdhci-pltfm.c

   1/*
   2 * sdhci-pltfm.c Support for SDHCI platform devices
   3 * Copyright (c) 2009 Intel Corporation
   4 *
   5 * Copyright (c) 2007, 2011 Freescale Semiconductor, Inc.
   6 * Copyright (c) 2009 MontaVista Software, Inc.
   7 *
   8 * Authors: Xiaobo Xie <X.Xie@freescale.com>
   9 *          Anton Vorontsov <avorontsov@ru.mvista.com>
  10 *
  11 * This program is free software; you can redistribute it and/or modify
  12 * it under the terms of the GNU General Public License version 2 as
  13 * published by the Free Software Foundation.
  14 *
  15 * This program is distributed in the hope that it will be useful,
  16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 * GNU General Public License for more details.
  19 *
  20 * You should have received a copy of the GNU General Public License
  21 * along with this program; if not, write to the Free Software
  22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23 */
  24
  25/* Supports:
  26 * SDHCI platform devices
  27 *
  28 * Inspired by sdhci-pci.c, by Pierre Ossman
  29 */
  30
  31#include <linux/err.h>
  32#include <linux/module.h>
  33#include <linux/of.h>
  34#ifdef CONFIG_PPC
  35#include <asm/machdep.h>
  36#endif
  37#include "sdhci-pltfm.h"
  38
  39unsigned int sdhci_pltfm_clk_get_max_clock(struct sdhci_host *host)
  40{
  41        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
  42
  43        return clk_get_rate(pltfm_host->clk);
  44}
  45EXPORT_SYMBOL_GPL(sdhci_pltfm_clk_get_max_clock);
  46
  47static struct sdhci_ops sdhci_pltfm_ops = {
  48};
  49
  50#ifdef CONFIG_OF
  51static bool sdhci_of_wp_inverted(struct device_node *np)
  52{
  53        if (of_get_property(np, "sdhci,wp-inverted", NULL) ||
  54            of_get_property(np, "wp-inverted", NULL))
  55                return true;
  56
  57        /* Old device trees don't have the wp-inverted property. */
  58#ifdef CONFIG_PPC
  59        return machine_is(mpc837x_rdb) || machine_is(mpc837x_mds);
  60#else
  61        return false;
  62#endif /* CONFIG_PPC */
  63}
  64
  65void sdhci_get_of_property(struct platform_device *pdev)
  66{
  67        struct device_node *np = pdev->dev.of_node;
  68        struct sdhci_host *host = platform_get_drvdata(pdev);
  69        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
  70        const __be32 *clk;
  71        u32 bus_width;
  72        int size;
  73
  74        if (of_device_is_available(np)) {
  75                if (of_get_property(np, "sdhci,auto-cmd12", NULL))
  76                        host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12;
  77
  78                if (of_get_property(np, "sdhci,1-bit-only", NULL) ||
  79                    (of_property_read_u32(np, "bus-width", &bus_width) == 0 &&
  80                    bus_width == 1))
  81                        host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA;
  82
  83                if (sdhci_of_wp_inverted(np))
  84                        host->quirks |= SDHCI_QUIRK_INVERTED_WRITE_PROTECT;
  85
  86                if (of_get_property(np, "broken-cd", NULL))
  87                        host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION;
  88
  89                if (of_get_property(np, "no-1-8-v", NULL))
  90                        host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V;
  91
  92                if (of_device_is_compatible(np, "fsl,p2020-rev1-esdhc"))
  93                        host->quirks |= SDHCI_QUIRK_BROKEN_DMA;
  94
  95                if (of_device_is_compatible(np, "fsl,p2020-esdhc") ||
  96                    of_device_is_compatible(np, "fsl,p1010-esdhc") ||
  97                    of_device_is_compatible(np, "fsl,mpc8536-esdhc"))
  98                        host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;
  99
 100                clk = of_get_property(np, "clock-frequency", &size);
 101                if (clk && size == sizeof(*clk) && *clk)
 102                        pltfm_host->clock = be32_to_cpup(clk);
 103
 104                if (of_find_property(np, "keep-power-in-suspend", NULL))
 105                        host->mmc->pm_caps |= MMC_PM_KEEP_POWER;
 106
 107                if (of_find_property(np, "enable-sdio-wakeup", NULL))
 108                        host->mmc->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
 109        }
 110}
 111#else
 112void sdhci_get_of_property(struct platform_device *pdev) {}
 113#endif /* CONFIG_OF */
 114EXPORT_SYMBOL_GPL(sdhci_get_of_property);
 115
 116struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev,
 117                                    struct sdhci_pltfm_data *pdata)
 118{
 119        struct sdhci_host *host;
 120        struct sdhci_pltfm_host *pltfm_host;
 121        struct device_node *np = pdev->dev.of_node;
 122        struct resource *iomem;
 123        int ret;
 124
 125        iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 126        if (!iomem) {
 127                ret = -ENOMEM;
 128                goto err;
 129        }
 130
 131        if (resource_size(iomem) < 0x100)
 132                dev_err(&pdev->dev, "Invalid iomem size!\n");
 133
 134        /* Some PCI-based MFD need the parent here */
 135        if (pdev->dev.parent != &platform_bus && !np)
 136                host = sdhci_alloc_host(pdev->dev.parent, sizeof(*pltfm_host));
 137        else
 138                host = sdhci_alloc_host(&pdev->dev, sizeof(*pltfm_host));
 139
 140        if (IS_ERR(host)) {
 141                ret = PTR_ERR(host);
 142                goto err;
 143        }
 144
 145        pltfm_host = sdhci_priv(host);
 146
 147        host->hw_name = dev_name(&pdev->dev);
 148        if (pdata && pdata->ops)
 149                host->ops = pdata->ops;
 150        else
 151                host->ops = &sdhci_pltfm_ops;
 152        if (pdata)
 153                host->quirks = pdata->quirks;
 154        host->irq = platform_get_irq(pdev, 0);
 155
 156        if (!request_mem_region(iomem->start, resource_size(iomem),
 157                mmc_hostname(host->mmc))) {
 158                dev_err(&pdev->dev, "cannot request region\n");
 159                ret = -EBUSY;
 160                goto err_request;
 161        }
 162
 163        host->ioaddr = ioremap(iomem->start, resource_size(iomem));
 164        if (!host->ioaddr) {
 165                dev_err(&pdev->dev, "failed to remap registers\n");
 166                ret = -ENOMEM;
 167                goto err_remap;
 168        }
 169
 170        /*
 171         * Some platforms need to probe the controller to be able to
 172         * determine which caps should be used.
 173         */
 174        if (host->ops && host->ops->platform_init)
 175                host->ops->platform_init(host);
 176
 177        platform_set_drvdata(pdev, host);
 178
 179        return host;
 180
 181err_remap:
 182        release_mem_region(iomem->start, resource_size(iomem));
 183err_request:
 184        sdhci_free_host(host);
 185err:
 186        dev_err(&pdev->dev, "%s failed %d\n", __func__, ret);
 187        return ERR_PTR(ret);
 188}
 189EXPORT_SYMBOL_GPL(sdhci_pltfm_init);
 190
 191void sdhci_pltfm_free(struct platform_device *pdev)
 192{
 193        struct sdhci_host *host = platform_get_drvdata(pdev);
 194        struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 195
 196        iounmap(host->ioaddr);
 197        release_mem_region(iomem->start, resource_size(iomem));
 198        sdhci_free_host(host);
 199        platform_set_drvdata(pdev, NULL);
 200}
 201EXPORT_SYMBOL_GPL(sdhci_pltfm_free);
 202
 203int sdhci_pltfm_register(struct platform_device *pdev,
 204                         struct sdhci_pltfm_data *pdata)
 205{
 206        struct sdhci_host *host;
 207        int ret = 0;
 208
 209        host = sdhci_pltfm_init(pdev, pdata);
 210        if (IS_ERR(host))
 211                return PTR_ERR(host);
 212
 213        sdhci_get_of_property(pdev);
 214
 215        ret = sdhci_add_host(host);
 216        if (ret)
 217                sdhci_pltfm_free(pdev);
 218
 219        return ret;
 220}
 221EXPORT_SYMBOL_GPL(sdhci_pltfm_register);
 222
 223int sdhci_pltfm_unregister(struct platform_device *pdev)
 224{
 225        struct sdhci_host *host = platform_get_drvdata(pdev);
 226        int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
 227
 228        sdhci_remove_host(host, dead);
 229        sdhci_pltfm_free(pdev);
 230
 231        return 0;
 232}
 233EXPORT_SYMBOL_GPL(sdhci_pltfm_unregister);
 234
 235#ifdef CONFIG_PM
 236static int sdhci_pltfm_suspend(struct device *dev)
 237{
 238        struct sdhci_host *host = dev_get_drvdata(dev);
 239
 240        return sdhci_suspend_host(host);
 241}
 242
 243static int sdhci_pltfm_resume(struct device *dev)
 244{
 245        struct sdhci_host *host = dev_get_drvdata(dev);
 246
 247        return sdhci_resume_host(host);
 248}
 249
 250const struct dev_pm_ops sdhci_pltfm_pmops = {
 251        .suspend        = sdhci_pltfm_suspend,
 252        .resume         = sdhci_pltfm_resume,
 253};
 254EXPORT_SYMBOL_GPL(sdhci_pltfm_pmops);
 255#endif  /* CONFIG_PM */
 256
 257static int __init sdhci_pltfm_drv_init(void)
 258{
 259        pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n");
 260
 261        return 0;
 262}
 263module_init(sdhci_pltfm_drv_init);
 264
 265static void __exit sdhci_pltfm_drv_exit(void)
 266{
 267}
 268module_exit(sdhci_pltfm_drv_exit);
 269
 270MODULE_DESCRIPTION("SDHCI platform and OF driver helper");
 271MODULE_AUTHOR("Intel Corporation");
 272MODULE_LICENSE("GPL v2");
 273