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-rw-r--r--board/qemu-malta/lowlevel_init.S69
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