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