drivers/mmc/host/sdhci-npcm.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * NPCM SDHC MMC host controller driver.
   4  *
   5  * Copyright (c) 2023 Nuvoton Technology corporation.
   6  */
   7
   8 #include <linux/clk.h>
   9 #include <linux/err.h>
  10 #include <linux/io.h>
  11 #include <linux/mmc/host.h>
  12 #include <linux/mmc/mmc.h>
  13 #include <linux/mod_devicetable.h>
  14 #include <linux/module.h>
  15 #include <linux/of.h>
  16
  17 #include "sdhci-pltfm.h"
  18
  19 static const struct sdhci_pltfm_data npcm7xx_sdhci_pdata = {
  20         .quirks  = SDHCI_QUIRK_DELAY_AFTER_POWER,
  21         .quirks2 = SDHCI_QUIRK2_STOP_WITH_TC |
  22                    SDHCI_QUIRK2_NO_1_8_V,
  23 };
  24
  25 static const struct sdhci_pltfm_data npcm8xx_sdhci_pdata = {
  26         .quirks  = SDHCI_QUIRK_DELAY_AFTER_POWER,
  27         .quirks2 = SDHCI_QUIRK2_STOP_WITH_TC,
  28 };
  29
  30 static int npcm_sdhci_probe(struct platform_device *pdev)
  31 {
  32         const struct sdhci_pltfm_data *data;
  33         struct sdhci_pltfm_host *pltfm_host;
  34         struct device *dev = &pdev->dev;
  35         struct sdhci_host *host;
  36         u32 caps;
  37         int ret;
  38
  39         data = of_device_get_match_data(dev);
  40         if (!data)
  41                 return -EINVAL;
  42
  43         host = sdhci_pltfm_init(pdev, data, 0);
  44         if (IS_ERR(host))
  45                 return PTR_ERR(host);
  46
  47         pltfm_host = sdhci_priv(host);
  48
  49         pltfm_host->clk = devm_clk_get_optional_enabled(dev, NULL);
  50         if (IS_ERR(pltfm_host->clk)) {
  51                 ret = PTR_ERR(pltfm_host->clk);
  52                 goto err_sdhci;
  53         }
  54
  55         caps = sdhci_readl(host, SDHCI_CAPABILITIES);
  56         if (caps & SDHCI_CAN_DO_8BIT)
  57                 host->mmc->caps |= MMC_CAP_8_BIT_DATA;
  58
  59         ret = mmc_of_parse(host->mmc);
  60         if (ret)
  61                 goto err_sdhci;
  62
  63         ret = sdhci_add_host(host);
  64         if (ret)
  65                 goto err_sdhci;
  66
  67         return 0;
  68
  69 err_sdhci:
  70         sdhci_pltfm_free(pdev);
  71         return ret;
  72 }
  73
  74 static const struct of_device_id npcm_sdhci_of_match[] = {
  75         { .compatible = "nuvoton,npcm750-sdhci", .data = &npcm7xx_sdhci_pdata },
  76         { .compatible = "nuvoton,npcm845-sdhci", .data = &npcm8xx_sdhci_pdata },
  77         { }
  78 };
  79 MODULE_DEVICE_TABLE(of, npcm_sdhci_of_match);
  80
  81 static struct platform_driver npcm_sdhci_driver = {
  82         .driver = {
  83                 .name   = "npcm-sdhci",
  84                 .of_match_table = npcm_sdhci_of_match,
  85                 .pm     = &sdhci_pltfm_pmops,
  86         },
  87         .probe          = npcm_sdhci_probe,
  88         .remove         = sdhci_pltfm_remove,
  89 };
  90 module_platform_driver(npcm_sdhci_driver);
  91
  92 MODULE_DESCRIPTION("NPCM Secure Digital Host Controller Interface driver");
  93 MODULE_AUTHOR("Tomer Maimon <tomer.maimon@nuvoton.com>");
  94 MODULE_LICENSE("GPL");