[RFC PATCH v2 2/6] powerpc: wii: bootwrapper bits
Benjamin Herrenschmidt
benh at kernel.crashing.org
Sat Dec 12 08:59:27 EST 2009
On Thu, 2009-12-03 at 23:47 +0100, Albert Herranz wrote:
> Add support for the Nintendo Wii video game console to the powerpc
> bootwrapper.
>
> dtbImage.wii is a wrapped image that contains a flat device tree,
> an entry point compatible with the Homebrew Channel and BootMii,
> and an optional initrd.
>
> Signed-off-by: Albert Herranz <albert_herranz at yahoo.es>
Acked-by: Benjamin Herrenschmidt <benh at kernel.crashing.org>
> ---
> v1 -> v2
> - Save one asm instruction in a non-critical path.
> Suggestion by Segher Boessenkool.
> - Use easier to read mtsrr0 and mtsrr1 mnemonics.
> Suggestion by Segher Boessenkool.
> - Get rid of sync before rfi.
> Suggestion by Segher Boessenkool.
> - Zero a BAT by simply zeroing the upper BAT instead of both lower
> and upper BATs. Suggestion by Segher Boessenkool.
> - Get rid of unneeded isync. Suggestion by Segher Boessenkool.
> - Write first the lower BAT then the upper BAT.
> Suggestion by Segher Boessenkool.
> - Get rid of unneeded "sync; isync". Suggestion by Segher Boessenkool.
> - Use read/modify/write to update HID4 instead of setting it to a known
> value. Suggestion by Segher Boessenkool.
> - Add an isync after modifying HID4. Suggestion by Segher Boessenkool.
> - Invalidate caches before enabling them. Suggestion by Segher Boessenkool.
> - Enable caches only if not enabled already.
> - Make sure EXI is enabled before probing for a USB Gecko.
>
> arch/powerpc/boot/Makefile | 3 +-
> arch/powerpc/boot/wii-head.S | 142 ++++++++++++++++++++++++++++++++++++++++++
> arch/powerpc/boot/wii.c | 46 ++++++++++++++
> arch/powerpc/boot/wrapper | 2 +-
> 4 files changed, 191 insertions(+), 2 deletions(-)
> create mode 100644 arch/powerpc/boot/wii-head.S
> create mode 100644 arch/powerpc/boot/wii.c
>
> diff --git a/arch/powerpc/boot/Makefile b/arch/powerpc/boot/Makefile
> index 3e70aab..bb2465b 100644
> --- a/arch/powerpc/boot/Makefile
> +++ b/arch/powerpc/boot/Makefile
> @@ -77,7 +77,7 @@ src-plat := of.c cuboot-52xx.c cuboot-824x.c cuboot-83xx.c cuboot-85xx.c holly.c
> cuboot-warp.c cuboot-85xx-cpm2.c cuboot-yosemite.c simpleboot.c \
> virtex405-head.S virtex.c redboot-83xx.c cuboot-sam440ep.c \
> cuboot-acadia.c cuboot-amigaone.c cuboot-kilauea.c \
> - gamecube-head.S gamecube.c
> + gamecube-head.S gamecube.c wii-head.S wii.c
> src-boot := $(src-wlib) $(src-plat) empty.c
>
> src-boot := $(addprefix $(obj)/, $(src-boot))
> @@ -256,6 +256,7 @@ image-$(CONFIG_STORCENTER) += cuImage.storcenter
> image-$(CONFIG_MPC7448HPC2) += cuImage.mpc7448hpc2
> image-$(CONFIG_PPC_C2K) += cuImage.c2k
> image-$(CONFIG_GAMECUBE) += dtbImage.gamecube
> +image-$(CONFIG_WII) += dtbImage.wii
>
> # Board port in arch/powerpc/platform/amigaone/Kconfig
> image-$(CONFIG_AMIGAONE) += cuImage.amigaone
> diff --git a/arch/powerpc/boot/wii-head.S b/arch/powerpc/boot/wii-head.S
> new file mode 100644
> index 0000000..edd79b8
> --- /dev/null
> +++ b/arch/powerpc/boot/wii-head.S
> @@ -0,0 +1,142 @@
> +/*
> + * arch/powerpc/boot/wii-head.S
> + *
> + * Nintendo Wii bootwrapper entry.
> + * Copyright (C) 2008-2009 The GameCube Linux Team
> + * Copyright (C) 2008,2009 Albert Herranz
> + *
> + * 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.
> + *
> + */
> +
> +#include "ppc_asm.h"
> +
> +/*
> + * The entry code does no assumptions regarding:
> + * - if the data and instruction caches are enabled or not
> + * - if the MMU is enabled or not
> + * - if the high BATs are enabled or not
> + *
> + * We enable the high BATs, enable the caches if not already enabled,
> + * enable the MMU with an identity mapping scheme and jump to the start code.
> + */
> +
> + .text
> +
> + .globl _zimage_start
> +_zimage_start:
> +
> + /* turn the MMU off */
> + mfmsr 9
> + rlwinm 9, 9, 0, ~((1<<4)|(1<<5)) /* MSR_DR|MSR_IR */
> + bcl 20, 31, 1f
> +1:
> + mflr 8
> + clrlwi 8, 8, 3 /* convert to a real address */
> + addi 8, 8, _mmu_off - 1b
> + mtsrr0 8
> + mtsrr1 9
> + rfi
> +_mmu_off:
> + /* MMU disabled */
> +
> + /* setup BATs */
> + isync
> + li 8, 0
> + mtspr 0x210, 8 /* IBAT0U */
> + mtspr 0x212, 8 /* IBAT1U */
> + mtspr 0x214, 8 /* IBAT2U */
> + mtspr 0x216, 8 /* IBAT3U */
> + mtspr 0x218, 8 /* DBAT0U */
> + mtspr 0x21a, 8 /* DBAT1U */
> + mtspr 0x21c, 8 /* DBAT2U */
> + mtspr 0x21e, 8 /* DBAT3U */
> +
> + mtspr 0x230, 8 /* IBAT4U */
> + mtspr 0x232, 8 /* IBAT5U */
> + mtspr 0x234, 8 /* IBAT6U */
> + mtspr 0x236, 8 /* IBAT7U */
> + mtspr 0x238, 8 /* DBAT4U */
> + mtspr 0x23a, 8 /* DBAT5U */
> + mtspr 0x23c, 8 /* DBAT6U */
> + mtspr 0x23e, 8 /* DBAT7U */
> +
> + li 8, 0x01ff /* first 16MiB */
> + li 9, 0x0002 /* rw */
> + mtspr 0x211, 9 /* IBAT0L */
> + mtspr 0x210, 8 /* IBAT0U */
> + mtspr 0x219, 9 /* DBAT0L */
> + mtspr 0x218, 8 /* DBAT0U */
> +
> + lis 8, 0x0c00 /* I/O mem */
> + ori 8, 8, 0x3ff /* 32MiB */
> + lis 9, 0x0c00
> + ori 9, 9, 0x002a /* uncached, guarded, rw */
> + mtspr 0x21b, 9 /* DBAT1L */
> + mtspr 0x21a, 8 /* DBAT1U */
> +
> + lis 8, 0x0100 /* next 8MiB */
> + ori 8, 8, 0x00ff /* 8MiB */
> + lis 9, 0x0100
> + ori 9, 9, 0x0002 /* rw */
> + mtspr 0x215, 9 /* IBAT2L */
> + mtspr 0x214, 8 /* IBAT2U */
> + mtspr 0x21d, 9 /* DBAT2L */
> + mtspr 0x21c, 8 /* DBAT2U */
> +
> + lis 8, 0x1000 /* MEM2 */
> + ori 8, 8, 0x07ff /* 64MiB */
> + lis 9, 0x1000
> + ori 9, 9, 0x0002 /* rw */
> + mtspr 0x216, 8 /* IBAT3U */
> + mtspr 0x217, 9 /* IBAT3L */
> + mtspr 0x21e, 8 /* DBAT3U */
> + mtspr 0x21f, 9 /* DBAT3L */
> +
> + /* enable the high BATs */
> + mfspr 8, 0x3f3 /* HID4 */
> + oris 8, 8, 0x0200
> + mtspr 0x3f3, 8 /* HID4 */
> +
> + /* enable and invalidate the caches if not already enabled */
> + mfspr 8, 0x3f0 /* HID0 */
> + andi. 0, 8, (1<<15) /* HID0_ICE */
> + bne 1f
> + ori 8, 8, (1<<15)|(1<<11) /* HID0_ICE|HID0_ICFI*/
> +1:
> + andi. 0, 8, (1<<14) /* HID0_DCE */
> + bne 1f
> + ori 8, 8, (1<<14)|(1<<10) /* HID0_DCE|HID0_DCFI*/
> +1:
> + mtspr 0x3f0, 8 /* HID0 */
> + isync
> +
> + /* initialize arguments */
> + li 3, 0
> + li 4, 0
> + li 5, 0
> +
> + /* turn the MMU on */
> + bcl 20, 31, 1f
> +1:
> + mflr 8
> + addi 8, 8, _mmu_on - 1b
> + mfmsr 9
> + ori 9, 9, (1<<4)|(1<<5) /* MSR_DR|MSR_IR */
> + mtsrr0 8
> + mtsrr1 9
> + sync
> + rfi
> +_mmu_on:
> + /* turn on the front blue led (aka: yay! we got here!) */
> + lis 8, 0x0d00
> + ori 8, 8, 0x00c0
> + lwz 9, 0(8)
> + ori 9, 9, 0x20
> + stw 9, 0(8)
> +
> + b _zimage_start_lib
> +
> diff --git a/arch/powerpc/boot/wii.c b/arch/powerpc/boot/wii.c
> new file mode 100644
> index 0000000..d0e2625
> --- /dev/null
> +++ b/arch/powerpc/boot/wii.c
> @@ -0,0 +1,46 @@
> +/*
> + * arch/powerpc/boot/wii.c
> + *
> + * Nintendo Wii bootwrapper support
> + * Copyright (C) 2008-2009 The GameCube Linux Team
> + * Copyright (C) 2008,2009 Albert Herranz
> + *
> + * 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.
> + *
> + */
> +
> +#include <stddef.h>
> +#include "stdio.h"
> +#include "types.h"
> +#include "io.h"
> +#include "ops.h"
> +
> +#include "ugecon.h"
> +
> +BSS_STACK(8192);
> +
> +#define HW_REG(x) ((void *)(x))
> +
> +#define EXI_CTRL HW_REG(0x0d800070)
> +#define EXI_CTRL_ENABLE (1<<0)
> +
> +void platform_init(unsigned long r3, unsigned long r4, unsigned long r5)
> +{
> + u32 heapsize = 24*1024*1024 - (u32)_end;
> +
> + simple_alloc_init(_end, heapsize, 32, 64);
> + fdt_init(_dtb_start);
> +
> + /*
> + * 'mini' boots the Broadway processor with EXI disabled.
> + * We need it enabled before probing for the USB Gecko.
> + */
> + out_be32(EXI_CTRL, in_be32(EXI_CTRL) | EXI_CTRL_ENABLE);
> +
> + if (ug_probe())
> + console_ops.write = ug_console_write;
> +}
> +
> diff --git a/arch/powerpc/boot/wrapper b/arch/powerpc/boot/wrapper
> index 5b9206f..390512a 100755
> --- a/arch/powerpc/boot/wrapper
> +++ b/arch/powerpc/boot/wrapper
> @@ -230,7 +230,7 @@ xpedite52*)
> link_address='0x1400000'
> platformo=$object/cuboot-85xx.o
> ;;
> -gamecube)
> +gamecube|wii)
> link_address='0x600000'
> platformo="$object/$platform-head.o $object/$platform.o"
> ;;
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