From 4390eaf67630ed0cff1ed069d73a243c145c2aa5 Mon Sep 17 00:00:00 2001 From: Faiz Abbas Date: Tue, 15 Oct 2019 18:24:38 +0530 Subject: [PATCH] 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 --- drivers/ufs/Kconfig | 6 ++++ drivers/ufs/Makefile | 1 + drivers/ufs/ti-j721e-ufs.c | 71 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 78 insertions(+) create mode 100644 drivers/ufs/ti-j721e-ufs.c diff --git a/drivers/ufs/Kconfig b/drivers/ufs/Kconfig index c272074082..c2aafd3020 100644 --- 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 9262bd6cd0..62ed016608 100644 --- 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 index 0000000000..24ec3ebea1 --- /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 +#include +#include +#include + +#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, +}; -- 2.25.1