1 files changed, 115 insertions, 3 deletions

diff --git a/arch/powerpc/boot/wii.c b/arch/powerpc/boot/wii.c
index d0e2625a953..2ebaec0344d 100644
--- a/arch/powerpc/boot/wii.c
+++ b/arch/powerpc/boot/wii.c
@@ -22,10 +22,120 @@
 
 BSS_STACK(8192);
 
-#define HW_REG(x)	((void *)(x))
+#define HW_REG(x)		((void *)(x))
 
-#define EXI_CTRL	HW_REG(0x0d800070)
-#define EXI_CTRL_ENABLE	(1<<0)
+#define EXI_CTRL		HW_REG(0x0d800070)
+#define EXI_CTRL_ENABLE		(1<<0)
+
+#define MEM2_TOP		(0x10000000 + 64*1024*1024)
+#define FIRMWARE_DEFAULT_SIZE	(12*1024*1024)
+
+
+struct mipc_infohdr {
+	char magic[3];
+	u8 version;
+	u32 mem2_boundary;
+	u32 ipc_in;
+	size_t ipc_in_size;
+	u32 ipc_out;
+	size_t ipc_out_size;
+};
+
+static int mipc_check_address(u32 pa)
+{
+	/* only MEM2 addresses */
+	if (pa < 0x10000000 || pa > 0x14000000)
+		return -EINVAL;
+	return 0;
+}
+
+static struct mipc_infohdr *mipc_get_infohdr(void)
+{
+	struct mipc_infohdr **hdrp, *hdr;
+
+	/* 'mini' header pointer is the last word of MEM2 memory */
+	hdrp = (struct mipc_infohdr **)0x13fffffc;
+	if (mipc_check_address((u32)hdrp)) {
+		printf("mini: invalid hdrp %08X\n", (u32)hdrp);
+		hdr = NULL;
+		goto out;
+	}
+
+	hdr = *hdrp;
+	if (mipc_check_address((u32)hdr)) {
+		printf("mini: invalid hdr %08X\n", (u32)hdr);
+		hdr = NULL;
+		goto out;
+	}
+	if (memcmp(hdr->magic, "IPC", 3)) {
+		printf("mini: invalid magic\n");
+		hdr = NULL;
+		goto out;
+	}
+
+out:
+	return hdr;
+}
+
+static int mipc_get_mem2_boundary(u32 *mem2_boundary)
+{
+	struct mipc_infohdr *hdr;
+	int error;
+
+	hdr = mipc_get_infohdr();
+	if (!hdr) {
+		error = -1;
+		goto out;
+	}
+
+	if (mipc_check_address(hdr->mem2_boundary)) {
+		printf("mini: invalid mem2_boundary %08X\n",
+		       hdr->mem2_boundary);
+		error = -EINVAL;
+		goto out;
+	}
+	*mem2_boundary = hdr->mem2_boundary;
+	error = 0;
+out:
+	return error;
+
+}
+
+static void platform_fixups(void)
+{
+	void *mem;
+	u32 reg[4];
+	u32 mem2_boundary;
+	int len;
+	int error;
+
+	mem = finddevice("/memory");
+	if (!mem)
+		fatal("Can't find memory node\n");
+
+	/* two ranges of (address, size) words */
+	len = getprop(mem, "reg", reg, sizeof(reg));
+	if (len != sizeof(reg)) {
+		/* nothing to do */
+		goto out;
+	}
+
+	/* retrieve MEM2 boundary from 'mini' */
+	error = mipc_get_mem2_boundary(&mem2_boundary);
+	if (error) {
+		/* if that fails use a sane value */
+		mem2_boundary = MEM2_TOP - FIRMWARE_DEFAULT_SIZE;
+	}
+
+	if (mem2_boundary > reg[2] && mem2_boundary < reg[2] + reg[3]) {
+		reg[3] = mem2_boundary - reg[2];
+		printf("top of MEM2 @ %08X\n", reg[2] + reg[3]);
+		setprop(mem, "reg", reg, sizeof(reg));
+	}
+
+out:
+	return;
+}
 
 void platform_init(unsigned long r3, unsigned long r4, unsigned long r5)
 {
@@ -42,5 +152,7 @@ void platform_init(unsigned long r3, unsigned long r4, unsigned long r5)
 
 	if (ug_probe())
 		console_ops.write = ug_console_write;
+
+	platform_ops.fixups = platform_fixups;
 }