> -Original Message-
> From: Liming Sun
> Sent: Monday, January 28, 2019 7:28 PM
> To: Rob Herring ; Mark Rutland
> ; Arnd Bergmann ; David Woods
> ; Andy Shevchenko ; Darren
> Hart ; Vadim Pasternak
> Cc: Liming Sun ; devicet...@vger.kernel.org; linux-
> ker...@vger.kernel.org; platform-driver-...@vger.kernel.org
> Subject: [PATCH v8 1/2] platform/mellanox: Add TmFifo driver for Mellanox
> BlueField Soc
>
> This commit adds the TmFifo platform driver for Mellanox BlueField Soc. TmFifo
> is a shared FIFO which enables external host machine to exchange data with the
> SoC via USB or PCIe. The driver is based on virtio framework and has console
> and network access enabled.
>
> Reviewed-by: David Woods
> Signed-off-by: Liming Sun
> ---
> drivers/platform/mellanox/Kconfig | 13 +-
> drivers/platform/mellanox/Makefile|1 +
> drivers/platform/mellanox/mlxbf-tmfifo-regs.h | 67 ++
> drivers/platform/mellanox/mlxbf-tmfifo.c | 1289
> +
> 4 files changed, 1369 insertions(+), 1 deletion(-) create mode 100644
> drivers/platform/mellanox/mlxbf-tmfifo-regs.h
> create mode 100644 drivers/platform/mellanox/mlxbf-tmfifo.c
>
> diff --git a/drivers/platform/mellanox/Kconfig
> b/drivers/platform/mellanox/Kconfig
> index cd8a908..a565070 100644
> --- a/drivers/platform/mellanox/Kconfig
> +++ b/drivers/platform/mellanox/Kconfig
> @@ -5,7 +5,7 @@
>
> menuconfig MELLANOX_PLATFORM
> bool "Platform support for Mellanox hardware"
> - depends on X86 || ARM || COMPILE_TEST
> + depends on X86 || ARM || ARM64 || COMPILE_TEST
> ---help---
> Say Y here to get to see options for platform support for
> Mellanox systems. This option alone does not add any kernel code.
> @@ -34,4 +34,15 @@ config MLXREG_IO
> to system resets operation, system reset causes monitoring and some
> kinds of mux selection.
>
> +config MLXBF_TMFIFO
> + tristate "Mellanox BlueField SoC TmFifo platform driver"
> + depends on ARM64
Why you make it dependent on ARM64?
Should not it work on any host, x86?
> + default m
User who needs it should select this option.
No need default 'm'.
> + select VIRTIO_CONSOLE
> + select VIRTIO_NET
> + help
> + Say y here to enable TmFifo support. The TmFifo driver provides
> + platform driver support for the TmFifo which supports console
> + and networking based on the virtio framework.
> +
> endif # MELLANOX_PLATFORM
> diff --git a/drivers/platform/mellanox/Makefile
> b/drivers/platform/mellanox/Makefile
> index 57074d9c..f0c061d 100644
> --- a/drivers/platform/mellanox/Makefile
> +++ b/drivers/platform/mellanox/Makefile
> @@ -5,3 +5,4 @@
> #
> obj-$(CONFIG_MLXREG_HOTPLUG) += mlxreg-hotplug.o
> obj-$(CONFIG_MLXREG_IO) += mlxreg-io.o
> +obj-$(CONFIG_MLXBF_TMFIFO) += mlxbf-tmfifo.o
> diff --git a/drivers/platform/mellanox/mlxbf-tmfifo-regs.h
> b/drivers/platform/mellanox/mlxbf-tmfifo-regs.h
> new file mode 100644
> index 000..90c9c2cf
> --- /dev/null
> +++ b/drivers/platform/mellanox/mlxbf-tmfifo-regs.h
> @@ -0,0 +1,67 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (c) 2019, Mellanox Technologies. All rights reserved.
> + */
> +
> +#ifndef __MLXBF_TMFIFO_REGS_H__
> +#define __MLXBF_TMFIFO_REGS_H__
> +
> +#include
> +
> +#define MLXBF_TMFIFO_TX_DATA 0x0
> +
> +#define MLXBF_TMFIFO_TX_STS 0x8
> +#define MLXBF_TMFIFO_TX_STS__LENGTH 0x0001 #define
> +MLXBF_TMFIFO_TX_STS__COUNT_SHIFT 0 #define
> +MLXBF_TMFIFO_TX_STS__COUNT_WIDTH 9 #define
> +MLXBF_TMFIFO_TX_STS__COUNT_RESET_VAL 0 #define
> +MLXBF_TMFIFO_TX_STS__COUNT_RMASK 0x1ff #define
> +MLXBF_TMFIFO_TX_STS__COUNT_MASK 0x1ff
> +
> +#define MLXBF_TMFIFO_TX_CTL 0x10
> +#define MLXBF_TMFIFO_TX_CTL__LENGTH 0x0001 #define
> +MLXBF_TMFIFO_TX_CTL__LWM_SHIFT 0 #define
> MLXBF_TMFIFO_TX_CTL__LWM_WIDTH
> +8 #define MLXBF_TMFIFO_TX_CTL__LWM_RESET_VAL 128 #define
> +MLXBF_TMFIFO_TX_CTL__LWM_RMASK 0xff #define
> +MLXBF_TMFIFO_TX_CTL__LWM_MASK 0xff #define
> +MLXBF_TMFIFO_TX_CTL__HWM_SHIFT 8 #define
> MLXBF_TMFIFO_TX_CTL__HWM_WIDTH
> +8 #define MLXBF_TMFIFO_TX_CTL__HWM_RESET_VAL 128 #define
> +MLXBF_TMFIFO_TX_CTL__HWM_RMASK 0xff #define
> +MLXBF_TMFIFO_TX_CTL__HWM_MASK 0xff00 #define
> +MLXBF_TMFIFO_TX_CTL__MAX_ENTRIES_SHIFT 32 #define
> +MLXBF_TMFIFO_TX_CTL__MAX_ENTRIES_WIDTH 9 #define
> +MLXBF_TMFIFO_TX_CTL__MAX_ENTRIES_RESET_VAL 256 #define
> +MLXBF_TMFIFO_TX_CTL__MAX_ENTRIES_RMASK 0x1ff #define
> +MLXBF_TMFIFO_TX_CTL__MAX_ENTRIES_MASK 0x1ffULL
> +
> +#define MLXBF_TMFIFO_RX_DATA 0x0
> +
> +#define MLXBF_TMFIFO_RX_STS 0x8
> +#define MLXBF_TMFIFO_RX_STS__LENGTH 0x0001 #define
> +MLXBF_TMFIFO_RX_STS__COUNT_SHIFT 0 #define
> +MLXBF_TMFIFO_RX_STS__COUNT_WIDTH 9 #define
> +MLXBF_TMFIFO_RX_STS__COUNT_RESET_VAL 0 #define
> +MLXBF_TMFIFO_RX_STS__COUNT_RMASK 0x1ff #define
> +MLXBF_TMFIFO_RX_STS__COUNT_MASK 0x1ff
> +
> +#define MLXBF_TMFIFO_RX_CTL 0x10
> +#define
