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From: Antony Pavlov <antonynpavlov@gmail.com>
To: barebox@lists.infradead.org
Subject: [RFC 4/7] MIPS: malta: add YAMON-style GT64120 memory map
Date: Fri, 20 Jul 2012 12:47:36 +0400	[thread overview]
Message-ID: <1342774059-2169-5-git-send-email-antonynpavlov@gmail.com> (raw)
In-Reply-To: <1342774059-2169-1-git-send-email-antonynpavlov@gmail.com>

YAMON-style GT64120 memory map make move UART to the new position.

We need YAMON-style GT64120 memory for running Linux kernel from
barebox.

WARNING! WIP! We need add some more effor for compartability
with qemu embedded YAMON.

E.g. we need put special Board ID at the start of bootrom:

--- a/arch/mips/boot/start.S
+++ b/arch/mips/boot/start.S
@@ -59,6 +59,10 @@ EXPORT(_start)
         nop

        .org    0x10
+#if 1
+       /* Board ID = 0x420 (Malta Board with CoreLV) */
+       .word   0x00000420
+#endif

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
---
 arch/mips/mach-malta/include/mach/hardware.h |    2 +-
 arch/mips/mach-malta/lowlevel_init.S         |   33 +++++++++++++++++++++++++-
 2 files changed, 33 insertions(+), 2 deletions(-)

diff --git a/arch/mips/mach-malta/include/mach/hardware.h b/arch/mips/mach-malta/include/mach/hardware.h
index ddeb1b7..fde8f22 100644
--- a/arch/mips/mach-malta/include/mach/hardware.h
+++ b/arch/mips/mach-malta/include/mach/hardware.h
@@ -21,7 +21,7 @@
 #ifndef __INCLUDE_ARCH_HARDWARE_H__
 #define   __INCLUDE_ARCH_HARDWARE_H__
 
-#define DEBUG_LL_UART_ADDR	0xb00003f8
+#define DEBUG_LL_UART_ADDR	0xb80003f8
 #define DEBUG_LL_UART_SHIFT	0
 
 /*
diff --git a/arch/mips/mach-malta/lowlevel_init.S b/arch/mips/mach-malta/lowlevel_init.S
index a34de74..a0134f8 100644
--- a/arch/mips/mach-malta/lowlevel_init.S
+++ b/arch/mips/mach-malta/lowlevel_init.S
@@ -29,7 +29,38 @@
 
 LEAF(mach_init_lowlevel)
 
-	/* nothing special yet */
+	/*
+	 * Load BAR registers of GT64120 as done by YAMON
+	 *
+	 * based on write_bootloader() in qemu.git/hw/mips_malta.c
+	 * see GT64120 manual and qemu.git/hw/gt64xxx.c for details
+	 *
+	 * This is big-endian version of code!
+	 */
+
+	/* move GT64120 registers to 0x1be00000 */
+	lui	t1, 0xb400
+	lui	t0, 0xdf00
+	sw	t0, 104(t1)
+
+	/* setup MEM-to-PCI0 mapping */
+	lui	t1, 0xbbe0
+
+	/* setup PCI0 io window to 18000000-181fffff */
+	lui	t0, 0xc000
+	sw	t0, 72(t1) /* GT_PCI0IOLD */
+	lui	t0, 0x4000
+	sw	t0, 80(t1) /* GT_PCI0IOHD */
+
+	/* setup PCI0 mem windows */
+	lui	t0, 0x8000
+	sw	t0, 88(t1) /* GT_PCI0M0LD */
+	lui	t0, 0x3f00
+	sw	t0, 96(t1) /* GT_PCI0M0HD */
+	lui	t0, 0xc100
+	sw	t0, 128(t1) /* GT_PCI0M1LD */
+	lui	t0, 0x5e00
+	sw	t0, 136(t1) /* GT_PCI0M1HD */
 
 	/* return */
 	b	mach_init_lowlevel_return
-- 
1.7.10


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  parent reply	other threads:[~2012-07-20  8:48 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-07-20  8:47 [WIP] add very basic ELF support on MIPS Antony Pavlov
2012-07-20  8:47 ` [RFC 1/7] MIPS: move start.S code to .text_entry section Antony Pavlov
2012-07-20  8:47 ` [RFC 2/7] MIPS: add the initial support for lowlevel init Antony Pavlov
2012-07-20  8:47 ` [RFC 3/7] MIPS: malta: add bogus " Antony Pavlov
2012-07-20  8:47 ` Antony Pavlov [this message]
2012-07-20 10:01   ` [RFC 4/7] MIPS: malta: add YAMON-style GT64120 memory map Antony Pavlov
2012-07-20  8:47 ` [RFC 5/7] MIPS: malta: make KSEG0 uncached Antony Pavlov
2012-07-20  8:47 ` [RFC 6/7] MIPS: qemu-malta: add KSEG0 memory region Antony Pavlov
2012-07-20  8:47 ` [RFC 7/7] bootm: add very basic ELF support on MIPS (stealed from kexec) Antony Pavlov

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