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path: root/drivers/mmc/host/dw_mmc-bluefield.c
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Diffstat (limited to 'drivers/mmc/host/dw_mmc-bluefield.c')
-rw-r--r--drivers/mmc/host/dw_mmc-bluefield.c68
1 files changed, 68 insertions, 0 deletions
diff --git a/drivers/mmc/host/dw_mmc-bluefield.c b/drivers/mmc/host/dw_mmc-bluefield.c
new file mode 100644
index 000000000..10baf122b
--- /dev/null
+++ b/drivers/mmc/host/dw_mmc-bluefield.c
@@ -0,0 +1,68 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2018 Mellanox Technologies.
+ */
+
+#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)
+{
+ return dw_mci_pltfm_register(pdev, &bluefield_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",
+ .probe_type = PROBE_PREFER_ASYNCHRONOUS,
+ .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");