ufs: Add glue layer driver for TI J721E devices

Add glue layer driver for the controller present on TI's J721E devices.

Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>

diff --git a/drivers/ufs/Kconfig b/drivers/ufs/Kconfig
index c27207408252c4016a9715861e135c4e8a689c27..c2aafd3020c977211b0916d2619c8f508f7680f7 100644 (file)
--- a/drivers/ufs/Kconfig
+++ b/drivers/ufs/Kconfig
@@ -14,4 +14,10 @@ config CADENCE_UFS
          This selects the platform driver for the Cadence UFS host
          controller present on present TI's J721e devices.
 
+config TI_J721E_UFS
+       bool "Glue Layer driver for UFS on TI J721E devices"
+       help
+         This selects the glue layer driver for Cadence controller
+         present on TI's J721E devices.
+
 endmenu

diff --git a/drivers/ufs/Makefile b/drivers/ufs/Makefile
index 9262bd6cd095fbf1d7e6c2949fbf31ed6cb5c6c5..62ed01660846528324c27c9958a93f16647cee4f 100644 (file)
--- a/drivers/ufs/Makefile
+++ b/drivers/ufs/Makefile
@@ -5,3 +5,4 @@
 
 obj-$(CONFIG_UFS) += ufs.o ufs-uclass.o
 obj-$(CONFIG_CADENCE_UFS) += cdns-platform.o
+obj-$(CONFIG_TI_J721E_UFS) += ti-j721e-ufs.o

diff --git a/drivers/ufs/ti-j721e-ufs.c b/drivers/ufs/ti-j721e-ufs.c
new file mode 100644 (file)
index 0000000..24ec3eb
--- /dev/null
+++ b/drivers/ufs/ti-j721e-ufs.c
@@ -0,0 +1,71 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/
+ */
+
+#include <asm/io.h>
+#include <clk.h>
+#include <common.h>
+#include <dm.h>
+
+#define UFS_SS_CTRL             0x4
+#define UFS_SS_RST_N_PCS        BIT(0)
+#define UFS_SS_CLK_26MHZ        BIT(4)
+
+static int ti_j721e_ufs_probe(struct udevice *dev)
+{
+       void __iomem *base;
+       unsigned int clock;
+       struct clk clk;
+       u32 reg = 0;
+       int ret;
+
+       ret = clk_get_by_index(dev, 0, &clk);
+       if (ret) {
+               dev_err(dev, "failed to get M-PHY clock\n");
+               return ret;
+       }
+
+       clock = clk_get_rate(&clk);
+       if (IS_ERR_VALUE(clock)) {
+               dev_err(dev, "failed to get rate\n");
+               return ret;
+       }
+
+       base = dev_remap_addr_index(dev, 0);
+
+       if (clock == 26000000)
+               reg |= UFS_SS_CLK_26MHZ;
+       /* Take UFS slave device out of reset */
+       reg |= UFS_SS_RST_N_PCS;
+       writel(reg, base + UFS_SS_CTRL);
+
+       return 0;
+}
+
+static int ti_j721e_ufs_remove(struct udevice *dev)
+{
+       void __iomem *base = dev_remap_addr_index(dev, 0);
+       u32 reg = readl(base + UFS_SS_CTRL);
+
+       reg &= ~UFS_SS_RST_N_PCS;
+       writel(reg, base + UFS_SS_CTRL);
+
+       return 0;
+}
+
+static const struct udevice_id ti_j721e_ufs_ids[] = {
+       {
+               .compatible = "ti,j721e-ufs",
+       },
+       {},
+};
+
+U_BOOT_DRIVER(ti_j721e_ufs) = {
+       .name                   = "ti-j721e-ufs",
+       .id                     = UCLASS_MISC,
+       .of_match               = ti_j721e_ufs_ids,
+       .probe                  = ti_j721e_ufs_probe,
+       .remove                 = ti_j721e_ufs_remove,
+       .flags                  = DM_FLAG_OS_PREPARE,
+};