mmc/host/dw_mmc-bluefield.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * Copyright (C) 2018 Mellanox Technologies.
0004  */
0005
0006 #include <linux/bitfield.h>
0007 #include <linux/bitops.h>
0008 #include <linux/mmc/host.h>
0009 #include <linux/mmc/mmc.h>
0010 #include <linux/module.h>
0011 #include <linux/of.h>
0012 #include <linux/platform_device.h>
0013 #include <linux/pm_runtime.h>
0014
0015 #include "dw_mmc.h"
0016 #include "dw_mmc-pltfm.h"
0017
0018 #define UHS_REG_EXT_SAMPLE_MASK     GENMASK(22, 16)
0019 #define UHS_REG_EXT_DRIVE_MASK      GENMASK(29, 23)
0020 #define BLUEFIELD_UHS_REG_EXT_SAMPLE    2
0021 #define BLUEFIELD_UHS_REG_EXT_DRIVE 4
0022
0023 static void dw_mci_bluefield_set_ios(struct dw_mci *host, struct mmc_ios *ios)
0024 {
0025     u32 reg;
0026
0027     /* Update the Drive and Sample fields in register UHS_REG_EXT. */
0028     reg = mci_readl(host, UHS_REG_EXT);
0029     reg &= ~UHS_REG_EXT_SAMPLE_MASK;
0030     reg |= FIELD_PREP(UHS_REG_EXT_SAMPLE_MASK,
0031               BLUEFIELD_UHS_REG_EXT_SAMPLE);
0032     reg &= ~UHS_REG_EXT_DRIVE_MASK;
0033     reg |= FIELD_PREP(UHS_REG_EXT_DRIVE_MASK, BLUEFIELD_UHS_REG_EXT_DRIVE);
0034     mci_writel(host, UHS_REG_EXT, reg);
0035 }
0036
0037 static const struct dw_mci_drv_data bluefield_drv_data = {
0038     .set_ios        = dw_mci_bluefield_set_ios
0039 };
0040
0041 static const struct of_device_id dw_mci_bluefield_match[] = {
0042     { .compatible = "mellanox,bluefield-dw-mshc",
0043       .data = &bluefield_drv_data },
0044     {},
0045 };
0046 MODULE_DEVICE_TABLE(of, dw_mci_bluefield_match);
0047
0048 static int dw_mci_bluefield_probe(struct platform_device *pdev)
0049 {
0050     return dw_mci_pltfm_register(pdev, &bluefield_drv_data);
0051 }
0052
0053 static struct platform_driver dw_mci_bluefield_pltfm_driver = {
0054     .probe      = dw_mci_bluefield_probe,
0055     .remove     = dw_mci_pltfm_remove,
0056     .driver     = {
0057         .name       = "dwmmc_bluefield",
0058         .probe_type = PROBE_PREFER_ASYNCHRONOUS,
0059         .of_match_table = dw_mci_bluefield_match,
0060         .pm     = &dw_mci_pltfm_pmops,
0061     },
0062 };
0063
0064 module_platform_driver(dw_mci_bluefield_pltfm_driver);
0065
0066 MODULE_DESCRIPTION("BlueField DW Multimedia Card driver");
0067 MODULE_AUTHOR("Mellanox Technologies");
0068 MODULE_LICENSE("GPL v2");