drivers/mmc/host/sdhci-dove.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * sdhci-dove.c Support for SDHCI on Marvell's Dove SoC
   4  *
   5  * Author: Saeed Bishara <saeed@marvell.com>
   6  *         Mike Rapoport <mike@compulab.co.il>
   7  * Based on sdhci-cns3xxx.c
   8  */
   9
  10 #include <linux/clk.h>
  11 #include <linux/err.h>
  12 #include <linux/io.h>
  13 #include <linux/mmc/host.h>
  14 #include <linux/module.h>
  15 #include <linux/of.h>
  16
  17 #include "sdhci-pltfm.h"
  18
  19 static u16 sdhci_dove_readw(struct sdhci_host *host, int reg)
  20 {
  21         u16 ret;
  22
  23         switch (reg) {
  24         case SDHCI_HOST_VERSION:
  25         case SDHCI_SLOT_INT_STATUS:
  26                 /* those registers don't exist */
  27                 return 0;
  28         default:
  29                 ret = readw(host->ioaddr + reg);
  30         }
  31         return ret;
  32 }
  33
  34 static u32 sdhci_dove_readl(struct sdhci_host *host, int reg)
  35 {
  36         u32 ret;
  37
  38         ret = readl(host->ioaddr + reg);
  39
  40         switch (reg) {
  41         case SDHCI_CAPABILITIES:
  42                 /* Mask the support for 3.0V */
  43                 ret &= ~SDHCI_CAN_VDD_300;
  44                 break;
  45         }
  46         return ret;
  47 }
  48
  49 static const struct sdhci_ops sdhci_dove_ops = {
  50         .read_w = sdhci_dove_readw,
  51         .read_l = sdhci_dove_readl,
  52         .set_clock = sdhci_set_clock,
  53         .set_bus_width = sdhci_set_bus_width,
  54         .reset = sdhci_reset,
  55         .set_uhs_signaling = sdhci_set_uhs_signaling,
  56 };
  57
  58 static const struct sdhci_pltfm_data sdhci_dove_pdata = {
  59         .ops    = &sdhci_dove_ops,
  60         .quirks = SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER |
  61                   SDHCI_QUIRK_NO_BUSY_IRQ |
  62                   SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
  63                   SDHCI_QUIRK_FORCE_DMA |
  64                   SDHCI_QUIRK_NO_HISPD_BIT,
  65 };
  66
  67 static int sdhci_dove_probe(struct platform_device *pdev)
  68 {
  69         struct sdhci_host *host;
  70         struct sdhci_pltfm_host *pltfm_host;
  71         int ret;
  72
  73         host = sdhci_pltfm_init(pdev, &sdhci_dove_pdata, 0);
  74         if (IS_ERR(host))
  75                 return PTR_ERR(host);
  76
  77         pltfm_host = sdhci_priv(host);
  78         pltfm_host->clk = devm_clk_get(&pdev->dev, NULL);
  79
  80         if (!IS_ERR(pltfm_host->clk))
  81                 clk_prepare_enable(pltfm_host->clk);
  82
  83         ret = mmc_of_parse(host->mmc);
  84         if (ret)
  85                 goto err_sdhci_add;
  86
  87         ret = sdhci_add_host(host);
  88         if (ret)
  89                 goto err_sdhci_add;
  90
  91         return 0;
  92
  93 err_sdhci_add:
  94         clk_disable_unprepare(pltfm_host->clk);
  95         sdhci_pltfm_free(pdev);
  96         return ret;
  97 }
  98
  99 static const struct of_device_id sdhci_dove_of_match_table[] = {
 100         { .compatible = "marvell,dove-sdhci", },
 101         {}
 102 };
 103 MODULE_DEVICE_TABLE(of, sdhci_dove_of_match_table);
 104
 105 static struct platform_driver sdhci_dove_driver = {
 106         .driver         = {
 107                 .name   = "sdhci-dove",
 108                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
 109                 .pm     = &sdhci_pltfm_pmops,
 110                 .of_match_table = sdhci_dove_of_match_table,
 111         },
 112         .probe          = sdhci_dove_probe,
 113         .remove         = sdhci_pltfm_unregister,
 114 };
 115
 116 module_platform_driver(sdhci_dove_driver);
 117
 118 MODULE_DESCRIPTION("SDHCI driver for Dove");
 119 MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>, "
 120               "Mike Rapoport <mike@compulab.co.il>");
 121 MODULE_LICENSE("GPL v2");