powerpc: gamecube: bootwrapper bits

Add support for the Nintendo GameCube video game console to the powerpc
bootwrapper.

dtbImage.gamecube is a wrapped image that contains a flat device tree,
an entry point compatible with SDload, and an optional initrd.

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

4 files changed, 153 insertions, 1 deletions

diff --git a/arch/powerpc/boot/Makefile b/arch/powerpc/boot/Makefile
index 44bce21d3ae2..3e70aabf6778 100644
--- a/arch/powerpc/boot/Makefile
+++ b/arch/powerpc/boot/Makefile
@@ -76,7 +76,8 @@ src-plat := of.c cuboot-52xx.c cuboot-824x.c cuboot-83xx.c cuboot-85xx.c holly.c
                 cuboot-katmai.c cuboot-rainier.c redboot-8xx.c ep8248e.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
+                cuboot-acadia.c cuboot-amigaone.c cuboot-kilauea.c \
+                gamecube-head.S gamecube.c
 src-boot := $(src-wlib) $(src-plat) empty.c
 
 src-boot := $(addprefix $(obj)/, $(src-boot))
@@ -254,6 +255,7 @@ image-$(CONFIG_KSI8560)			+= cuImage.ksi8560
 image-$(CONFIG_STORCENTER)              += cuImage.storcenter
 image-$(CONFIG_MPC7448HPC2)             += cuImage.mpc7448hpc2
 image-$(CONFIG_PPC_C2K)                 += cuImage.c2k
+image-$(CONFIG_GAMECUBE)                += dtbImage.gamecube
 
 # Board port in arch/powerpc/platform/amigaone/Kconfig
 image-$(CONFIG_AMIGAONE)                += cuImage.amigaone
diff --git a/arch/powerpc/boot/gamecube-head.S b/arch/powerpc/boot/gamecube-head.S
new file mode 100644
index 000000000000..65a9b2a3bf33
--- /dev/null
+++ b/arch/powerpc/boot/gamecube-head.S
@@ -0,0 +1,111 @@
+/*
+ * arch/powerpc/boot/gamecube-head.S
+ *
+ * Nintendo GameCube bootwrapper entry.
+ * Copyright (C) 2004-2009 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
+ *
+ * We 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 */
+
+        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 */
+
+        /* 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:
+        b _zimage_start_lib
+
diff --git a/arch/powerpc/boot/gamecube.c b/arch/powerpc/boot/gamecube.c
new file mode 100644
index 000000000000..28ae7057be5e
--- /dev/null
+++ b/arch/powerpc/boot/gamecube.c
@@ -0,0 +1,35 @@
+/*
+ * arch/powerpc/boot/gamecube.c
+ *
+ * Nintendo GameCube bootwrapper support
+ * Copyright (C) 2004-2009 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);
+
+void platform_init(unsigned long r3, unsigned long r4, unsigned long r5)
+{
+        u32 heapsize = 16*1024*1024 - (u32)_end;
+
+        simple_alloc_init(_end, heapsize, 32, 64);
+        fdt_init(_dtb_start);
+
+        if (ug_probe())
+                console_ops.write = ug_console_write;
+}
+
diff --git a/arch/powerpc/boot/wrapper b/arch/powerpc/boot/wrapper
index ac9e9a58b2b0..5b9206f45552 100755
--- a/arch/powerpc/boot/wrapper
+++ b/arch/powerpc/boot/wrapper
@@ -230,6 +230,10 @@ xpedite52*)
     link_address='0x1400000'
     platformo=$object/cuboot-85xx.o
     ;;
+gamecube)
+    link_address='0x600000'
+    platformo="$object/$platform-head.o $object/$platform.o"
+    ;;
 esac
 
 vmz="$tmpdir/`basename \"$kernel\"`.$ext"