1 files changed, 69 insertions, 0 deletions
diff --git a/board/qemu-malta/lowlevel_init.S b/board/qemu-malta/lowlevel_init.S
new file mode 100644
index 0000000..fa0b6a7
--- /dev/null
+++ b/board/qemu-malta/lowlevel_init.S
@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2013 Gabor Juhos <juhosg@openwrt.org>
+ *
+ * SPDX-License-Identifier:	GPL-2.0
+ */
+
+#include <config.h>
+#include <gt64120.h>
+
+#include <asm/addrspace.h>
+#include <asm/regdef.h>
+#include <asm/malta.h>
+
+#ifdef CONFIG_SYS_BIG_ENDIAN
+#define CPU_TO_GT32(_x)		((_x))
+#else
+#define CPU_TO_GT32(_x) (					\
+	(((_x) & 0xff) << 24) | (((_x) & 0xff00) << 8) |	\
+	(((_x) & 0xff0000) >> 8) | (((_x) & 0xff000000) >> 24))
+#endif
+
+	.text
+	.set noreorder
+	.set mips32
+
+	.globl	lowlevel_init
+lowlevel_init:
+
+	/*
+	 * Load BAR registers of GT64120 as done by YAMON
+	 *
+	 * based on a patch sent by Antony Pavlov <antonynpavlov@gmail.com>
+	 * to the barebox mailing list.
+	 * The subject of the original patch:
+	 *   'MIPS: qemu-malta: add YAMON-style GT64120 memory map'
+	 * URL:
+	 * http://www.mail-archive.com/barebox@lists.infradead.org/msg06128.html
+	 *
+	 * based on write_bootloader() in qemu.git/hw/mips_malta.c
+	 * see GT64120 manual and qemu.git/hw/gt64xxx.c for details
+	 */
+
+	/* move GT64120 registers from 0x14000000 to 0x1be00000 */
+	li	t1, KSEG1ADDR(GT_DEF_BASE)
+	li	t0, CPU_TO_GT32(0xdf000000)
+	sw	t0, GT_ISD_OFS(t1)
+
+	/* setup MEM-to-PCI0 mapping */
+	li	t1, KSEG1ADDR(MALTA_GT_BASE)
+
+	/* setup PCI0 io window to 0x18000000-0x181fffff */
+	li	t0, CPU_TO_GT32(0xc0000000)
+	sw	t0, GT_PCI0IOLD_OFS(t1)
+	li	t0, CPU_TO_GT32(0x40000000)
+	sw	t0, GT_PCI0IOHD_OFS(t1)
+
+	/* setup PCI0 mem windows */
+	li	t0, CPU_TO_GT32(0x80000000)
+	sw	t0, GT_PCI0M0LD_OFS(t1)
+	li	t0, CPU_TO_GT32(0x3f000000)
+	sw	t0, GT_PCI0M0HD_OFS(t1)
+
+	li	t0, CPU_TO_GT32(0xc1000000)
+	sw	t0, GT_PCI0M1LD_OFS(t1)
+	li	t0, CPU_TO_GT32(0x5e000000)
+	sw	t0, GT_PCI0M1HD_OFS(t1)
+
+	jr	ra
+	 nop