drivers/mmc/host/dw_mmc-bluefield.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2018 Mellanox Technologies.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  */
  10
  11 #include <linux/bitfield.h>
  12 #include <linux/bitops.h>
  13 #include <linux/mmc/host.h>
  14 #include <linux/mmc/mmc.h>
  15 #include <linux/module.h>
  16 #include <linux/of.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/pm_runtime.h>
  19
  20 #include "dw_mmc.h"
  21 #include "dw_mmc-pltfm.h"
  22
  23 #define UHS_REG_EXT_SAMPLE_MASK         GENMASK(22, 16)
  24 #define UHS_REG_EXT_DRIVE_MASK          GENMASK(29, 23)
  25 #define BLUEFIELD_UHS_REG_EXT_SAMPLE    2
  26 #define BLUEFIELD_UHS_REG_EXT_DRIVE     4
  27
  28 static void dw_mci_bluefield_set_ios(struct dw_mci *host, struct mmc_ios *ios)
  29 {
  30         u32 reg;
  31
  32         /* Update the Drive and Sample fields in register UHS_REG_EXT. */
  33         reg = mci_readl(host, UHS_REG_EXT);
  34         reg &= ~UHS_REG_EXT_SAMPLE_MASK;
  35         reg |= FIELD_PREP(UHS_REG_EXT_SAMPLE_MASK,
  36                           BLUEFIELD_UHS_REG_EXT_SAMPLE);
  37         reg &= ~UHS_REG_EXT_DRIVE_MASK;
  38         reg |= FIELD_PREP(UHS_REG_EXT_DRIVE_MASK, BLUEFIELD_UHS_REG_EXT_DRIVE);
  39         mci_writel(host, UHS_REG_EXT, reg);
  40 }
  41
  42 static const struct dw_mci_drv_data bluefield_drv_data = {
  43         .set_ios                = dw_mci_bluefield_set_ios
  44 };
  45
  46 static const struct of_device_id dw_mci_bluefield_match[] = {
  47         { .compatible = "mellanox,bluefield-dw-mshc",
  48           .data = &bluefield_drv_data },
  49         {},
  50 };
  51 MODULE_DEVICE_TABLE(of, dw_mci_bluefield_match);
  52
  53 static int dw_mci_bluefield_probe(struct platform_device *pdev)
  54 {
  55         const struct dw_mci_drv_data *drv_data = NULL;
  56         const struct of_device_id *match;
  57
  58         if (pdev->dev.of_node) {
  59                 match = of_match_node(dw_mci_bluefield_match,
  60                                       pdev->dev.of_node);
  61                 drv_data = match->data;
  62         }
  63
  64         return dw_mci_pltfm_register(pdev, drv_data);
  65 }
  66
  67 static struct platform_driver dw_mci_bluefield_pltfm_driver = {
  68         .probe          = dw_mci_bluefield_probe,
  69         .remove         = dw_mci_pltfm_remove,
  70         .driver         = {
  71                 .name           = "dwmmc_bluefield",
  72                 .of_match_table = dw_mci_bluefield_match,
  73                 .pm             = &dw_mci_pltfm_pmops,
  74         },
  75 };
  76
  77 module_platform_driver(dw_mci_bluefield_pltfm_driver);
  78
  79 MODULE_DESCRIPTION("BlueField DW Multimedia Card driver");
  80 MODULE_AUTHOR("Mellanox Technologies");
  81 MODULE_LICENSE("GPL v2");