Re: [PATCH] linux: arch: define aspeed SOC IO mapping

[Christian Svensson <blue@cmd.nu>]

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Ping.


On Mon, Nov 12, 2018 at 3:26 PM Christian Svensson <bluecmd@google.com>
wrote:

> Without this IO mapping early printk will simply not work after the
> paging and MMU has been setup.
>
> This patch maps all the whole 0x1e600000 IO space to 0xfe600000.
>
> Signed-off-by: Christian Svensson <bluecmd@google.com>
> ---
>  arch/arm/Makefile                 |  1 +
>  arch/arm/mach-aspeed/Makefile     |  1 +
>  arch/arm/mach-aspeed/aspeed_soc.c | 47 +++++++++++++++++++++++++++++++
>  arch/arm/mach-aspeed/iomap.h      | 17 +++++++++++
>  4 files changed, 66 insertions(+)
>  create mode 100644 arch/arm/mach-aspeed/Makefile
>  create mode 100644 arch/arm/mach-aspeed/aspeed_soc.c
>  create mode 100644 arch/arm/mach-aspeed/iomap.h
>
> diff --git a/arch/arm/Makefile b/arch/arm/Makefile
> index fc26c3d7b9b6..f0e3ca392f8c 100644
> --- a/arch/arm/Makefile
> +++ b/arch/arm/Makefile
> @@ -159,6 +159,7 @@ textofs-$(CONFIG_ARCH_AXXIA) := 0x00308000
>  machine-$(CONFIG_ARCH_ACTIONS)         += actions
>  machine-$(CONFIG_ARCH_ALPINE)          += alpine
>  machine-$(CONFIG_ARCH_ARTPEC)          += artpec
> +machine-$(CONFIG_ARCH_ASPEED)          += aspeed
>  machine-$(CONFIG_ARCH_AT91)            += at91
>  machine-$(CONFIG_ARCH_AXXIA)           += axxia
>  machine-$(CONFIG_ARCH_BCM)             += bcm
> diff --git a/arch/arm/mach-aspeed/Makefile b/arch/arm/mach-aspeed/Makefile
> new file mode 100644
> index 000000000000..426952d47cc3
> --- /dev/null
> +++ b/arch/arm/mach-aspeed/Makefile
> @@ -0,0 +1 @@
> +obj-y := aspeed_soc.o
> diff --git a/arch/arm/mach-aspeed/aspeed_soc.c
> b/arch/arm/mach-aspeed/aspeed_soc.c
> new file mode 100644
> index 000000000000..187276c2813d
> --- /dev/null
> +++ b/arch/arm/mach-aspeed/aspeed_soc.c
> @@ -0,0 +1,47 @@
> +/*
> + * Copyright (C) 2018 Google, Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/init.h>
> +#include <linux/of_platform.h>
> +
> +#include <asm/mach/arch.h>
> +#include <asm/mach/map.h>
> +
> +#include "iomap.h"
> +
> +// This is needed for e.g. earlyprintk
> +static struct map_desc io_desc[] __initdata = {
> +       {
> +               .virtual = AST_IO_VIRT,
> +               .pfn = __phys_to_pfn(AST_IO_PHYS),
> +               .length = AST_IO_SIZE,
> +               .type = MT_DEVICE
> +       }
> +};
> +
> +static void __init aspeed_map_io(void)
> +{
> +       iotable_init(io_desc, ARRAY_SIZE(io_desc));
> +}
> +
> +static const char * const aspeed_compat[] = {
> +       "aspeed,ast2400",
> +       "aspeed,ast2500",
> +       NULL
> +};
> +
> +DT_MACHINE_START(ASPEED_DT, "Aspeed SoC")
> +       .map_io = aspeed_map_io,
> +       .dt_compat = aspeed_compat,
> +MACHINE_END
> diff --git a/arch/arm/mach-aspeed/iomap.h b/arch/arm/mach-aspeed/iomap.h
> new file mode 100644
> index 000000000000..7ea5276f3892
> --- /dev/null
> +++ b/arch/arm/mach-aspeed/iomap.h
> @@ -0,0 +1,17 @@
> +/*
> + * Copyright (C) 2018 Google, Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#define AST_IO_PHYS 0x1e600000
> +#define AST_IO_VIRT 0xfe600000
> +#define AST_IO_SIZE 0x00200000
> --
> 2.19.1.930.g4563a0d9d0-goog
>
>

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