linux/arch/powerpc/boot/44x.c
David Gibson b2ba34f370 [POWERPC] Derive ebc ranges property from EBC registers
In the device tree for Ebony, the 'ranges' property in the node for
the EBC bridge shows the mappings from the chip select / address lines
actually used for the EBC peripherals into the address space of the
OPB.  At present, these mappings are hardcoded in ebony.dts for the
mappings set up by the OpenBIOS firmware when it configures the EBC
bridge.

This replaces the hardcoded mappings with code in the zImage to
read the EBC configuration registers and create an appropriate ranges
property based on them.  This should make the zImage and kernel more
robust to changes in firmware configuration.  In particular, some of
the Ebony's DIP switches can change the effective address of the Flash
and other peripherals in OPB space.  With this patch, the kernel will
be able to cope with at least some of the possible variations.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
2007-06-14 22:30:16 +10:00

86 lines
2.0 KiB
C

/*
* Copyright 2007 David Gibson, IBM Corporation.
*
* Based on earlier code:
* Matt Porter <mporter@kernel.crashing.org>
* Copyright 2002-2005 MontaVista Software Inc.
*
* Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
* Copyright (c) 2003, 2004 Zultys Technologies
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <stddef.h>
#include "types.h"
#include "string.h"
#include "stdio.h"
#include "ops.h"
#include "reg.h"
#include "dcr.h"
/* Read the 44x memory controller to get size of system memory. */
void ibm44x_fixup_memsize(void)
{
int i;
unsigned long memsize, bank_config;
memsize = 0;
for (i = 0; i < ARRAY_SIZE(sdram_bxcr); i++) {
mtdcr(DCRN_SDRAM0_CFGADDR, sdram_bxcr[i]);
bank_config = mfdcr(DCRN_SDRAM0_CFGDATA);
if (bank_config & SDRAM_CONFIG_BANK_ENABLE)
memsize += SDRAM_CONFIG_BANK_SIZE(bank_config);
}
dt_fixup_memory(0, memsize);
}
#define SPRN_DBCR0 0x134
#define DBCR0_RST_SYSTEM 0x30000000
void ibm44x_dbcr_reset(void)
{
unsigned long tmp;
asm volatile (
"mfspr %0,%1\n"
"oris %0,%0,%2@h\n"
"mtspr %1,%0"
: "=&r"(tmp) : "i"(SPRN_DBCR0), "i"(DBCR0_RST_SYSTEM)
);
}
/* Read 4xx EBC bus bridge registers to get mappings of the peripheral
* banks into the OPB address space */
void ibm4xx_fixup_ebc_ranges(const char *ebc)
{
void *devp;
u32 bxcr;
u32 ranges[EBC_NUM_BANKS*4];
u32 *p = ranges;
int i;
for (i = 0; i < EBC_NUM_BANKS; i++) {
mtdcr(DCRN_EBC0_CFGADDR, EBC_BXCR(i));
bxcr = mfdcr(DCRN_EBC0_CFGDATA);
if ((bxcr & EBC_BXCR_BU) != EBC_BXCR_BU_OFF) {
*p++ = i;
*p++ = 0;
*p++ = bxcr & EBC_BXCR_BAS;
*p++ = EBC_BXCR_BANK_SIZE(bxcr);
}
}
devp = finddevice(ebc);
if (! devp)
fatal("Couldn't locate EBC node %s\n\r", ebc);
setprop(devp, "ranges", ranges, (p - ranges) * sizeof(u32));
}