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.
Signed-off-by: Liming Sun <[email protected]> Reviewed-by: David Woods <[email protected]> --- drivers/mmc/host/Kconfig | 9 ++++ drivers/mmc/host/Makefile | 1 + drivers/mmc/host/dw_mmc-bluefield.c | 87 +++++++++++++++++++++++++++++++++++++ 3 files changed, 97 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..21db031 --- /dev/null +++ b/drivers/mmc/host/dw_mmc-bluefield.c @@ -0,0 +1,87 @@ +// 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" + +#define UHS_REG_EXT_SAMPLE_WIDTH 7 +#define UHS_REG_EXT_SAMPLE_SHIFT 16 +#define UHS_REG_EXT_DRIVE_WIDTH 7 +#define UHS_REG_EXT_DRIVE_SHIFT 23 + +#define BLUEFIELD_UHS_REG_EXT_SAMPLE 2 +#define BLUEFIELD_UHS_REG_EXT_DRIVE 4 + +#define SET_REG_FIELD(reg, value, width, shift) \ + ((reg) = (((reg) & ~(((1 << (width)) - 1) << (shift))) | \ + ((value) << (shift)))) + +static void dw_mci_bluefield_set_ios(struct dw_mci *host, struct mmc_ios *ios) +{ + u32 reg; + + /* Update the Drive and Sample fields in register UHS_REG_EXT. */ + reg = mci_readl(host, UHS_REG_EXT); + SET_REG_FIELD(reg, BLUEFIELD_UHS_REG_EXT_SAMPLE, + UHS_REG_EXT_SAMPLE_WIDTH, UHS_REG_EXT_SAMPLE_SHIFT); + SET_REG_FIELD(reg, BLUEFIELD_UHS_REG_EXT_DRIVE, + UHS_REG_EXT_DRIVE_WIDTH, UHS_REG_EXT_DRIVE_SHIFT); + mci_writel(host, UHS_REG_EXT, reg); +} + +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
