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    Subject[PATCH v5 1/3] mmc: dw_mmc-bluefield: Add driver extension
    Date
    This commit adds extension to the dw_mmc driver for Mellanox BlueField
    SoC. It updates the UHS_REG_EXT register to bring up the eMMC card on
    this SoC.

    Cc: stable@kernel.org
    Signed-off-by: Liming Sun <lsun@mellanox.com>
    Reviewed-by: David Woods <dwoods@mellanox.com>
    ---
    drivers/mmc/host/Kconfig | 9 +++++
    drivers/mmc/host/Makefile | 1 +
    drivers/mmc/host/dw_mmc-bluefield.c | 72 +++++++++++++++++++++++++++++++++++++
    3 files changed, 82 insertions(+)
    create mode 100644 drivers/mmc/host/dw_mmc-bluefield.c

    diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
    index 9589f9c..26ac6b5 100644
    --- a/drivers/mmc/host/Kconfig
    +++ b/drivers/mmc/host/Kconfig
    @@ -717,6 +717,15 @@ config MMC_DW_K3
    Synopsys DesignWare Memory Card Interface driver. Select this option
    for platforms based on Hisilicon K3 SoC's.

    +config MMC_DW_BLUEFIELD
    + tristate "BlueField specific extensions for Synopsys DW Memory Card Interface"
    + depends on MMC_DW
    + select MMC_DW_PLTFM
    + help
    + This selects support for Mellanox BlueField SoC specific extensions to
    + the Synopsys DesignWare Memory Card Interface driver. Select this
    + option for platforms based on Mellanox BlueField SoC's.
    +
    config MMC_DW_PCI
    tristate "Synopsys Designware MCI support on PCI bus"
    depends on MMC_DW && PCI
    diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
    index 6aead24..267b3f1 100644
    --- a/drivers/mmc/host/Makefile
    +++ b/drivers/mmc/host/Makefile
    @@ -55,6 +55,7 @@ obj-$(CONFIG_MMC_DW_K3) += dw_mmc-k3.o
    obj-$(CONFIG_MMC_DW_PCI) += dw_mmc-pci.o
    obj-$(CONFIG_MMC_DW_ROCKCHIP) += dw_mmc-rockchip.o
    obj-$(CONFIG_MMC_DW_ZX) += dw_mmc-zx.o
    +obj-$(CONFIG_MMC_DW_BLUEFIELD) += dw_mmc-bluefield.o
    obj-$(CONFIG_MMC_SH_MMCIF) += sh_mmcif.o
    obj-$(CONFIG_MMC_JZ4740) += jz4740_mmc.o
    obj-$(CONFIG_MMC_VUB300) += vub300.o
    diff --git a/drivers/mmc/host/dw_mmc-bluefield.c b/drivers/mmc/host/dw_mmc-bluefield.c
    new file mode 100644
    index 0000000..12067b1
    --- /dev/null
    +++ b/drivers/mmc/host/dw_mmc-bluefield.c
    @@ -0,0 +1,72 @@
    +// SPDX-License-Identifier: GPL-2.0
    +/*
    + * Copyright (C) 2018 Mellanox Technologies.
    + *
    + * This program is free software; you can redistribute it and/or modify
    + * it under the terms of the GNU General Public License as published by
    + * the Free Software Foundation; either version 2 of the License, or
    + * (at your option) any later version.
    + */
    +
    +#include <linux/module.h>
    +#include <linux/io.h>
    +#include <linux/irq.h>
    +#include <linux/platform_device.h>
    +#include <linux/pm_runtime.h>
    +#include <linux/mmc/host.h>
    +#include <linux/mmc/mmc.h>
    +#include <linux/of.h>
    +
    +#include "dw_mmc.h"
    +#include "dw_mmc-pltfm.h"
    +
    +static void dw_mci_bluefield_set_ios(struct dw_mci *host, struct mmc_ios *ios)
    +{
    + u32 regs;
    +
    + /* Set drive=4 (bit 29:23) and sample=2 (bit 22:16) in UHS_REG_EXT. */
    + regs = mci_readl(host, UHS_REG_EXT);
    + regs = (regs & ~0x3F100000 & ~0x7F0000) | (4 << 23) | (2 << 16);
    + mci_writel(host, UHS_REG_EXT, regs);
    +}
    +
    +static const struct dw_mci_drv_data bluefield_drv_data = {
    + .set_ios = dw_mci_bluefield_set_ios
    +};
    +
    +static const struct of_device_id dw_mci_bluefield_match[] = {
    + { .compatible = "mellanox,bluefield-dw-mshc",
    + .data = &bluefield_drv_data },
    + {},
    +};
    +MODULE_DEVICE_TABLE(of, dw_mci_bluefield_match);
    +
    +static int dw_mci_bluefield_probe(struct platform_device *pdev)
    +{
    + const struct dw_mci_drv_data *drv_data = NULL;
    + const struct of_device_id *match;
    +
    + if (pdev->dev.of_node) {
    + match = of_match_node(dw_mci_bluefield_match,
    + pdev->dev.of_node);
    + drv_data = match->data;
    + }
    +
    + return dw_mci_pltfm_register(pdev, drv_data);
    +}
    +
    +static struct platform_driver dw_mci_bluefield_pltfm_driver = {
    + .probe = dw_mci_bluefield_probe,
    + .remove = dw_mci_pltfm_remove,
    + .driver = {
    + .name = "dwmmc_bluefield",
    + .of_match_table = dw_mci_bluefield_match,
    + .pm = &dw_mci_pltfm_pmops,
    + },
    +};
    +
    +module_platform_driver(dw_mci_bluefield_pltfm_driver);
    +
    +MODULE_DESCRIPTION("BlueField DW Multimedia Card driver");
    +MODULE_AUTHOR("Mellanox Technologies");
    +MODULE_LICENSE("GPL v2");
    --
    1.8.3.1
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