drivers/mmc/host/sdhci-pltfm.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * sdhci-pltfm.c Support for SDHCI platform devices
   4  * Copyright (c) 2009 Intel Corporation
   5  *
   6  * Copyright (c) 2007, 2011 Freescale Semiconductor, Inc.
   7  * Copyright (c) 2009 MontaVista Software, Inc.
   8  *
   9  * Authors: Xiaobo Xie <X.Xie@freescale.com>
  10  *          Anton Vorontsov <avorontsov@ru.mvista.com>
  11  */
  12
  13 /* Supports:
  14  * SDHCI platform devices
  15  *
  16  * Inspired by sdhci-pci.c, by Pierre Ossman
  17  */
  18
  19 #include <linux/err.h>
  20 #include <linux/module.h>
  21 #include <linux/property.h>
  22 #include <linux/of.h>
  23 #ifdef CONFIG_PPC
  24 #include <asm/machdep.h>
  25 #endif
  26 #include "sdhci-pltfm.h"
  27
  28 unsigned int sdhci_pltfm_clk_get_max_clock(struct sdhci_host *host)
  29 {
  30         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
  31
  32         return clk_get_rate(pltfm_host->clk);
  33 }
  34 EXPORT_SYMBOL_GPL(sdhci_pltfm_clk_get_max_clock);
  35
  36 static const struct sdhci_ops sdhci_pltfm_ops = {
  37         .set_clock = sdhci_set_clock,
  38         .set_bus_width = sdhci_set_bus_width,
  39         .reset = sdhci_reset,
  40         .set_uhs_signaling = sdhci_set_uhs_signaling,
  41 };
  42
  43 static bool sdhci_wp_inverted(struct device *dev)
  44 {
  45         if (device_property_present(dev, "sdhci,wp-inverted") ||
  46             device_property_present(dev, "wp-inverted"))
  47                 return true;
  48
  49         /* Old device trees don't have the wp-inverted property. */
  50 #ifdef CONFIG_PPC
  51         return machine_is(mpc837x_rdb) || machine_is(mpc837x_mds);
  52 #else
  53         return false;
  54 #endif /* CONFIG_PPC */
  55 }
  56
  57 #ifdef CONFIG_OF
  58 static void sdhci_get_compatibility(struct platform_device *pdev)
  59 {
  60         struct sdhci_host *host = platform_get_drvdata(pdev);
  61         struct device_node *np = pdev->dev.of_node;
  62
  63         if (!np)
  64                 return;
  65
  66         if (of_device_is_compatible(np, "fsl,p2020-rev1-esdhc"))
  67                 host->quirks |= SDHCI_QUIRK_BROKEN_DMA;
  68
  69         if (of_device_is_compatible(np, "fsl,p2020-esdhc") ||
  70             of_device_is_compatible(np, "fsl,p1010-esdhc") ||
  71             of_device_is_compatible(np, "fsl,t4240-esdhc") ||
  72             of_device_is_compatible(np, "fsl,mpc8536-esdhc"))
  73                 host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;
  74 }
  75 #else
  76 void sdhci_get_compatibility(struct platform_device *pdev) {}
  77 #endif /* CONFIG_OF */
  78
  79 void sdhci_get_property(struct platform_device *pdev)
  80 {
  81         struct device *dev = &pdev->dev;
  82         struct sdhci_host *host = platform_get_drvdata(pdev);
  83         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
  84         u32 bus_width;
  85
  86         if (device_property_present(dev, "sdhci,auto-cmd12"))
  87                 host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12;
  88
  89         if (device_property_present(dev, "sdhci,1-bit-only") ||
  90             (device_property_read_u32(dev, "bus-width", &bus_width) == 0 &&
  91             bus_width == 1))
  92                 host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA;
  93
  94         if (sdhci_wp_inverted(dev))
  95                 host->quirks |= SDHCI_QUIRK_INVERTED_WRITE_PROTECT;
  96
  97         if (device_property_present(dev, "broken-cd"))
  98                 host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION;
  99
 100         if (device_property_present(dev, "no-1-8-v"))
 101                 host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V;
 102
 103         sdhci_get_compatibility(pdev);
 104
 105         device_property_read_u32(dev, "clock-frequency", &pltfm_host->clock);
 106
 107         if (device_property_present(dev, "keep-power-in-suspend"))
 108                 host->mmc->pm_caps |= MMC_PM_KEEP_POWER;
 109
 110         if (device_property_read_bool(dev, "wakeup-source") ||
 111             device_property_read_bool(dev, "enable-sdio-wakeup")) /* legacy */
 112                 host->mmc->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
 113 }
 114 EXPORT_SYMBOL_GPL(sdhci_get_property);
 115
 116 struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev,
 117                                     const struct sdhci_pltfm_data *pdata,
 118                                     size_t priv_size)
 119 {
 120         struct sdhci_host *host;
 121         void __iomem *ioaddr;
 122         int irq, ret;
 123
 124         ioaddr = devm_platform_ioremap_resource(pdev, 0);
 125         if (IS_ERR(ioaddr)) {
 126                 ret = PTR_ERR(ioaddr);
 127                 goto err;
 128         }
 129
 130         irq = platform_get_irq(pdev, 0);
 131         if (irq < 0) {
 132                 ret = irq;
 133                 goto err;
 134         }
 135
 136         host = sdhci_alloc_host(&pdev->dev,
 137                 sizeof(struct sdhci_pltfm_host) + priv_size);
 138
 139         if (IS_ERR(host)) {
 140                 ret = PTR_ERR(host);
 141                 goto err;
 142         }
 143
 144         host->ioaddr = ioaddr;
 145         host->irq = irq;
 146         host->hw_name = dev_name(&pdev->dev);
 147         if (pdata && pdata->ops)
 148                 host->ops = pdata->ops;
 149         else
 150                 host->ops = &sdhci_pltfm_ops;
 151         if (pdata) {
 152                 host->quirks = pdata->quirks;
 153                 host->quirks2 = pdata->quirks2;
 154         }
 155
 156         platform_set_drvdata(pdev, host);
 157
 158         return host;
 159 err:
 160         dev_err(&pdev->dev, "%s failed %d\n", __func__, ret);
 161         return ERR_PTR(ret);
 162 }
 163 EXPORT_SYMBOL_GPL(sdhci_pltfm_init);
 164
 165 void sdhci_pltfm_free(struct platform_device *pdev)
 166 {
 167         struct sdhci_host *host = platform_get_drvdata(pdev);
 168
 169         sdhci_free_host(host);
 170 }
 171 EXPORT_SYMBOL_GPL(sdhci_pltfm_free);
 172
 173 int sdhci_pltfm_register(struct platform_device *pdev,
 174                         const struct sdhci_pltfm_data *pdata,
 175                         size_t priv_size)
 176 {
 177         struct sdhci_host *host;
 178         int ret = 0;
 179
 180         host = sdhci_pltfm_init(pdev, pdata, priv_size);
 181         if (IS_ERR(host))
 182                 return PTR_ERR(host);
 183
 184         sdhci_get_property(pdev);
 185
 186         ret = sdhci_add_host(host);
 187         if (ret)
 188                 sdhci_pltfm_free(pdev);
 189
 190         return ret;
 191 }
 192 EXPORT_SYMBOL_GPL(sdhci_pltfm_register);
 193
 194 int sdhci_pltfm_unregister(struct platform_device *pdev)
 195 {
 196         struct sdhci_host *host = platform_get_drvdata(pdev);
 197         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 198         int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
 199
 200         sdhci_remove_host(host, dead);
 201         clk_disable_unprepare(pltfm_host->clk);
 202         sdhci_pltfm_free(pdev);
 203
 204         return 0;
 205 }
 206 EXPORT_SYMBOL_GPL(sdhci_pltfm_unregister);
 207
 208 #ifdef CONFIG_PM_SLEEP
 209 int sdhci_pltfm_suspend(struct device *dev)
 210 {
 211         struct sdhci_host *host = dev_get_drvdata(dev);
 212         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 213         int ret;
 214
 215         if (host->tuning_mode != SDHCI_TUNING_MODE_3)
 216                 mmc_retune_needed(host->mmc);
 217
 218         ret = sdhci_suspend_host(host);
 219         if (ret)
 220                 return ret;
 221
 222         clk_disable_unprepare(pltfm_host->clk);
 223
 224         return 0;
 225 }
 226 EXPORT_SYMBOL_GPL(sdhci_pltfm_suspend);
 227
 228 int sdhci_pltfm_resume(struct device *dev)
 229 {
 230         struct sdhci_host *host = dev_get_drvdata(dev);
 231         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 232         int ret;
 233
 234         ret = clk_prepare_enable(pltfm_host->clk);
 235         if (ret)
 236                 return ret;
 237
 238         ret = sdhci_resume_host(host);
 239         if (ret)
 240                 clk_disable_unprepare(pltfm_host->clk);
 241
 242         return ret;
 243 }
 244 EXPORT_SYMBOL_GPL(sdhci_pltfm_resume);
 245 #endif
 246
 247 const struct dev_pm_ops sdhci_pltfm_pmops = {
 248         SET_SYSTEM_SLEEP_PM_OPS(sdhci_pltfm_suspend, sdhci_pltfm_resume)
 249 };
 250 EXPORT_SYMBOL_GPL(sdhci_pltfm_pmops);
 251
 252 static int __init sdhci_pltfm_drv_init(void)
 253 {
 254         pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n");
 255
 256         return 0;
 257 }
 258 module_init(sdhci_pltfm_drv_init);
 259
 260 static void __exit sdhci_pltfm_drv_exit(void)
 261 {
 262 }
 263 module_exit(sdhci_pltfm_drv_exit);
 264
 265 MODULE_DESCRIPTION("SDHCI platform and OF driver helper");
 266 MODULE_AUTHOR("Intel Corporation");
 267 MODULE_LICENSE("GPL v2");