LXR linux/drivers/mmc/host/dw

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Copyright (C) 2018 Mellanox Technologies.
   4 */
   5
   6#include <linux/bitfield.h>
   7#include <linux/bitops.h>
   8#include <linux/mmc/host.h>
   9#include <linux/mmc/mmc.h>
  10#include <linux/module.h>
  11#include <linux/of.h>
  12#include <linux/platform_device.h>
  13#include <linux/pm_runtime.h>
  14
  15#include "dw_mmc.h"
  16#include "dw_mmc-pltfm.h"
  17
  18#define UHS_REG_EXT_SAMPLE_MASK         GENMASK(22, 16)
  19#define UHS_REG_EXT_DRIVE_MASK          GENMASK(29, 23)
  20#define BLUEFIELD_UHS_REG_EXT_SAMPLE    2
  21#define BLUEFIELD_UHS_REG_EXT_DRIVE     4
  22
  23static void dw_mci_bluefield_set_ios(struct dw_mci *host, struct mmc_ios *ios)
  24{
  25        u32 reg;
  26
  27        /* Update the Drive and Sample fields in register UHS_REG_EXT. */
  28        reg = mci_readl(host, UHS_REG_EXT);
  29        reg &= ~UHS_REG_EXT_SAMPLE_MASK;
  30        reg |= FIELD_PREP(UHS_REG_EXT_SAMPLE_MASK,
  31                          BLUEFIELD_UHS_REG_EXT_SAMPLE);
  32        reg &= ~UHS_REG_EXT_DRIVE_MASK;
  33        reg |= FIELD_PREP(UHS_REG_EXT_DRIVE_MASK, BLUEFIELD_UHS_REG_EXT_DRIVE);
  34        mci_writel(host, UHS_REG_EXT, reg);
  35}
  36
  37static const struct dw_mci_drv_data bluefield_drv_data = {
  38        .set_ios                = dw_mci_bluefield_set_ios
  39};
  40
  41static const struct of_device_id dw_mci_bluefield_match[] = {
  42        { .compatible = "mellanox,bluefield-dw-mshc",
  43          .data = &bluefield_drv_data },
  44        {},
  45};
  46MODULE_DEVICE_TABLE(of, dw_mci_bluefield_match);
  47
  48static int dw_mci_bluefield_probe(struct platform_device *pdev)
  49{
  50        return dw_mci_pltfm_register(pdev, &bluefield_drv_data);
  51}
  52
  53static struct platform_driver dw_mci_bluefield_pltfm_driver = {
  54        .probe          = dw_mci_bluefield_probe,
  55        .remove         = dw_mci_pltfm_remove,
  56        .driver         = {
  57                .name           = "dwmmc_bluefield",
  58                .of_match_table = dw_mci_bluefield_match,
  59                .pm             = &dw_mci_pltfm_pmops,
  60        },
  61};
  62
  63module_platform_driver(dw_mci_bluefield_pltfm_driver);
  64
  65MODULE_DESCRIPTION("BlueField DW Multimedia Card driver");
  66MODULE_AUTHOR("Mellanox Technologies");
  67MODULE_LICENSE("GPL v2");
  68