Add Support for the platform driver for the Cadence device present on TI's J721e device.
Signed-off-by: Faiz Abbas faiz_abbas@ti.com --- drivers/ufs/Kconfig | 8 +++ drivers/ufs/Makefile | 1 + drivers/ufs/cdns-platform.c | 122 ++++++++++++++++++++++++++++++++++++ 3 files changed, 131 insertions(+) create mode 100644 drivers/ufs/cdns-platform.c
diff --git a/drivers/ufs/Kconfig b/drivers/ufs/Kconfig index b0981062d8..c272074082 100644 --- a/drivers/ufs/Kconfig +++ b/drivers/ufs/Kconfig @@ -6,4 +6,12 @@ config UFS help This selects support for Universal Flash Subsystem (UFS). Say Y here if you want UFS Support. + +config CADENCE_UFS + bool "Cadence platform driver for UFS" + depends on UFS + help + This selects the platform driver for the Cadence UFS host + controller present on present TI's J721e devices. + endmenu diff --git a/drivers/ufs/Makefile b/drivers/ufs/Makefile index b8df759f66..9262bd6cd0 100644 --- a/drivers/ufs/Makefile +++ b/drivers/ufs/Makefile @@ -4,3 +4,4 @@ #
obj-$(CONFIG_UFS) += ufs.o ufs-uclass.o +obj-$(CONFIG_CADENCE_UFS) += cdns-platform.o diff --git a/drivers/ufs/cdns-platform.c b/drivers/ufs/cdns-platform.c new file mode 100644 index 0000000000..c80f4253e4 --- /dev/null +++ b/drivers/ufs/cdns-platform.c @@ -0,0 +1,122 @@ +// SPDX-License-Identifier: GPL-2.0+ +/** + * cdns-platform.c - Platform driver for Cadence UFSHCI device + * + * Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com + */ + +#include <clk.h> +#include <common.h> +#include <dm.h> +#include <ufs.h> + +#include "ufs.h" + +#define USEC_PER_SEC 1000000L + +#define CDNS_UFS_REG_HCLKDIV 0xFC +#define CDNS_UFS_REG_PHY_XCFGD1 0x113C + +static int cdns_ufs_link_startup_notify(struct ufs_hba *hba, + enum ufs_notify_change_status status) +{ + hba->quirks |= UFSHCD_QUIRK_BROKEN_LCC; + switch (status) { + case PRE_CHANGE: + return ufshcd_dme_set(hba, + UIC_ARG_MIB(PA_LOCAL_TX_LCC_ENABLE), + 0); + case POST_CHANGE: + ; + } + + return 0; +} + +static int cdns_ufs_set_hclkdiv(struct ufs_hba *hba) +{ + struct clk clk; + unsigned long core_clk_rate = 0; + u32 core_clk_div = 0; + int ret; + + ret = clk_get_by_name(hba->dev, "core_clk", &clk); + if (ret) { + dev_err(hba->dev, "failed to get core_clk clock\n"); + return ret; + } + + core_clk_rate = clk_get_rate(&clk); + if (IS_ERR_VALUE(core_clk_rate)) { + dev_err(hba->dev, "%s: unable to find core_clk rate\n", + __func__); + return core_clk_rate; + } + + core_clk_div = core_clk_rate / USEC_PER_SEC; + ufshcd_writel(hba, core_clk_div, CDNS_UFS_REG_HCLKDIV); + + return 0; +} + +static int cdns_ufs_hce_enable_notify(struct ufs_hba *hba, + enum ufs_notify_change_status status) +{ + switch (status) { + case PRE_CHANGE: + return cdns_ufs_set_hclkdiv(hba); + case POST_CHANGE: + ; + } + + return 0; +} + +static int cdns_ufs_init(struct ufs_hba *hba) +{ + u32 data; + + /* Increase RX_Advanced_Min_ActivateTime_Capability */ + data = ufshcd_readl(hba, CDNS_UFS_REG_PHY_XCFGD1); + data |= BIT(24); + ufshcd_writel(hba, data, CDNS_UFS_REG_PHY_XCFGD1); + + return 0; +} + +static struct ufs_hba_ops cdns_pltfm_hba_ops = { + .init = cdns_ufs_init, + .hce_enable_notify = cdns_ufs_hce_enable_notify, + .link_startup_notify = cdns_ufs_link_startup_notify, +}; + +static int cdns_ufs_pltfm_probe(struct udevice *dev) +{ + int err = ufshcd_probe(dev, &cdns_pltfm_hba_ops); + if (err) + dev_err(dev, "ufshcd_probe() failed %d\n", err); + + return err; +} + +static int cdns_ufs_pltfm_bind(struct udevice *dev) +{ + struct udevice *scsi_dev; + + return ufs_scsi_bind(dev, &scsi_dev); +} + +static const struct udevice_id cdns_ufs_pltfm_ids[] = { + { + .compatible = "cdns,ufshc-m31-16nm", + }, + {}, +}; + +U_BOOT_DRIVER(cdns_ufs_pltfm) = { + .name = "cdns-ufs-pltfm", + .id = UCLASS_UFS, + .of_match = cdns_ufs_pltfm_ids, + .probe = cdns_ufs_pltfm_probe, + .bind = cdns_ufs_pltfm_bind, +};