linux/arch/powerpc/boot/cuboot-taishan.c
Benjamin Herrenschmidt 190de00538 [POWERPC] 4xx: Rework clock probing in boot wrapper
This reworks the boot wrapper library function that probes
the chip clocks. Better separate the base function that is
used on 440GX,SPe,EP,... from the uart fixups as those need
different device-tree path on different processors.

Also, rework the function itself based on the arch/ppc code
from Eugene Surovegin which I find more readable, and which
handles one more bypass case. Also handle the subtle difference
between 440EP/EPx and 440SPe/GX, on the former, PerClk is derived
from the PLB clock while on the later, it's derived from the OPB.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
2007-12-23 13:14:48 -06:00

55 lines
1.2 KiB
C

/*
* Old U-boot compatibility for Taishan
*
* Author: Hugh Blemings <hugh@au.ibm.com>
*
* Copyright 2007 Hugh Blemings, IBM Corporation.
* Based on cuboot-ebony.c which is:
* Copyright 2007 David Gibson, IBM Corporation.
* Based on cuboot-83xx.c, which is:
* Copyright (c) 2007 Freescale Semiconductor, Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*/
#include "ops.h"
#include "stdio.h"
#include "cuboot.h"
#include "reg.h"
#include "dcr.h"
#include "4xx.h"
#define TARGET_44x
#include "ppcboot.h"
static bd_t bd;
BSS_STACK(4096);
static void taishan_fixups(void)
{
/* FIXME: sysclk should be derived by reading the FPGA
registers */
unsigned long sysclk = 33000000;
ibm440gx_fixup_clocks(sysclk, 6 * 1843200, 25000000);
ibm4xx_sdram_fixup_memsize();
dt_fixup_mac_addresses(bd.bi_enetaddr, bd.bi_enet1addr);
ibm4xx_fixup_ebc_ranges("/plb/opb/ebc");
}
void platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
unsigned long r6, unsigned long r7)
{
CUBOOT_INIT();
platform_ops.fixups = taishan_fixups;
fdt_init(_dtb_start);
serial_console_init();
}