powerpc: wii: bootwrapper bits

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@yahoo.es>
Acked-by: Segher Boessenkool <segher@kernel.crashing.org>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

4 files changed, 191 insertions, 2 deletions

diff --git a/arch/powerpc/boot/Makefile b/arch/powerpc/boot/Makefile
index 3e70aabf6778..bb2465bcb327 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 000000000000..edd79b836fcf
--- /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 000000000000..d0e2625a9539
--- /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 5b9206f45552..390512ae7f86 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"
     ;;