mmc: dw_mmc-bluefield: Add driver extension

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 <lsun@mellanox.com>
Reviewed-by: David Woods <dwoods@mellanox.com>
Reviewed-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index d70d11d0abab272587ad39f77b672a27bac34489..0581c199c996546d9f02b8fe5db0f5cfbc9963fc 100644 (file)
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -686,6 +686,15 @@ config MMC_DW_PLTFM
 
          If unsure, say Y.
 
+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_EXYNOS
        tristate "Exynos specific extensions for Synopsys DW Memory Card Interface"
        depends on MMC_DW

diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
index 6aead24879b4225d60c8ae1432ee047882becfd7..85dc1322c3de1bc50c8456ea3ec5d664215f07d6 100644 (file)
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -49,6 +49,7 @@ thunderx-mmc-objs := cavium.o cavium-thunderx.o
 obj-$(CONFIG_MMC_CAVIUM_THUNDERX) += thunderx-mmc.o
 obj-$(CONFIG_MMC_DW)           += dw_mmc.o
 obj-$(CONFIG_MMC_DW_PLTFM)     += dw_mmc-pltfm.o
+obj-$(CONFIG_MMC_DW_BLUEFIELD) += dw_mmc-bluefield.o
 obj-$(CONFIG_MMC_DW_EXYNOS)    += dw_mmc-exynos.o
 obj-$(CONFIG_MMC_DW_HI3798CV200) += dw_mmc-hi3798cv200.o
 obj-$(CONFIG_MMC_DW_K3)                += dw_mmc-k3.o

diff --git a/drivers/mmc/host/dw_mmc-bluefield.c b/drivers/mmc/host/dw_mmc-bluefield.c
new file mode 100644 (file)
index 0000000..54c3fbb
--- /dev/null
+++ b/drivers/mmc/host/dw_mmc-bluefield.c
@@ -0,0 +1,81 @@
+// 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/bitfield.h>
+#include <linux/bitops.h>
+#include <linux/mmc/host.h>
+#include <linux/mmc/mmc.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+
+#include "dw_mmc.h"
+#include "dw_mmc-pltfm.h"
+
+#define UHS_REG_EXT_SAMPLE_MASK                GENMASK(22, 16)
+#define UHS_REG_EXT_DRIVE_MASK         GENMASK(29, 23)
+#define BLUEFIELD_UHS_REG_EXT_SAMPLE   2
+#define BLUEFIELD_UHS_REG_EXT_DRIVE    4
+
+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);
+       reg &= ~UHS_REG_EXT_SAMPLE_MASK;
+       reg |= FIELD_PREP(UHS_REG_EXT_SAMPLE_MASK,
+                         BLUEFIELD_UHS_REG_EXT_SAMPLE);
+       reg &= ~UHS_REG_EXT_DRIVE_MASK;
+       reg |= FIELD_PREP(UHS_REG_EXT_DRIVE_MASK, BLUEFIELD_UHS_REG_EXT_DRIVE);
+       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");