drivers/mmc/host/dw_mmc-bluefield.c

   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
  23 static 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
  37 static const struct dw_mci_drv_data bluefield_drv_data = {
  38         .set_ios                = dw_mci_bluefield_set_ios
  39 };
  40
  41 static const struct of_device_id dw_mci_bluefield_match[] = {
  42         { .compatible = "mellanox,bluefield-dw-mshc",
  43           .data = &bluefield_drv_data },
  44         {},
  45 };
  46 MODULE_DEVICE_TABLE(of, dw_mci_bluefield_match);
  47
  48 static int dw_mci_bluefield_probe(struct platform_device *pdev)
  49 {
  50         const struct dw_mci_drv_data *drv_data = NULL;
  51         const struct of_device_id *match;
  52
  53         if (pdev->dev.of_node) {
  54                 match = of_match_node(dw_mci_bluefield_match,
  55                                       pdev->dev.of_node);
  56                 drv_data = match->data;
  57         }
  58
  59         return dw_mci_pltfm_register(pdev, drv_data);
  60 }
  61
  62 static struct platform_driver dw_mci_bluefield_pltfm_driver = {
  63         .probe          = dw_mci_bluefield_probe,
  64         .remove         = dw_mci_pltfm_remove,
  65         .driver         = {
  66                 .name           = "dwmmc_bluefield",
  67                 .of_match_table = dw_mci_bluefield_match,
  68                 .pm             = &dw_mci_pltfm_pmops,
  69         },
  70 };
  71
  72 module_platform_driver(dw_mci_bluefield_pltfm_driver);
  73
  74 MODULE_DESCRIPTION("BlueField DW Multimedia Card driver");
  75 MODULE_AUTHOR("Mellanox Technologies");
  76 MODULE_LICENSE("GPL v2");