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kernel add
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/*
* Copyright © 2013 Tony Breeds IBM Corporation
* Copyright © 2013 Alistair Popple IBM Corporation
*
* Based on earlier code:
* Copyright (C) Paul Mackerras 1997.
*
* 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
*
* Copyright 2007 David Gibson, IBM Corporation.
* Copyright 2010 Ben. Herrenschmidt, IBM Corporation.
* Copyright © 2011 David Kleikamp IBM Corporation
*
* 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 <stdarg.h>
#include <stddef.h>
#include "types.h"
#include "elf.h"
#include "string.h"
#include "stdlib.h"
#include "stdio.h"
#include "page.h"
#include "ops.h"
#include "reg.h"
#include "io.h"
#include "dcr.h"
#include "4xx.h"
#include "44x.h"
#include "libfdt.h"
BSS_STACK(4096);
#define SPRN_PIR 0x11E /* Processor Indentification Register */
#define USERDATA_LEN 256 /* Length of userdata passed in by PIBS */
#define MAX_RANKS 0x4
#define DDR3_MR0CF 0x80010011U
#define CCTL0_MCO2 0x8000080FU
#define CCTL0_MCO3 0x80000810U
#define CCTL0_MCO4 0x80000811U
#define CCTL0_MCO5 0x80000812U
#define CCTL0_MCO6 0x80000813U
static unsigned long long ibm_akebono_memsize;
static long long unsigned mac_addr;
static unsigned long long ibm_akebono_detect_memsize(void)
{
u32 reg;
unsigned i;
unsigned long long memsize = 0;
for (i = 0; i < MAX_RANKS; i++) {
reg = mfdcrx(DDR3_MR0CF + i);
if (!(reg & 1))
continue;
reg &= 0x0000f000;
reg >>= 12;
memsize += (0x800000ULL << reg);
}
return memsize;
}
static void ibm_akebono_fixups(void)
{
void *emac;
u32 reg;
dt_fixup_memory(0x0ULL, ibm_akebono_memsize);
/* Fixup the SD timeout frequency */
mtdcrx(CCTL0_MCO4, 0x1);
/* Disable SD high-speed mode (which seems to be broken) */
reg = mfdcrx(CCTL0_MCO2) & ~0x2;
mtdcrx(CCTL0_MCO2, reg);
/* Set the MAC address */
emac = finddevice("/plb/opb/ethernet");
if (emac > 0) {
if (mac_addr)
setprop(emac, "local-mac-address",
((u8 *) &mac_addr) + 2 , 6);
}
}
void platform_init(char *userdata)
{
unsigned long end_of_ram, avail_ram;
u32 pir_reg;
int node, size;
const u32 *timebase;
int len, i, userdata_len;
char *end;
userdata[USERDATA_LEN - 1] = '\0';
userdata_len = strlen(userdata);
for (i = 0; i < userdata_len - 15; i++) {
if (strncmp(&userdata[i], "local-mac-addr=", 15) == 0) {
if (i > 0 && userdata[i - 1] != ' ') {
/* We've only found a substring ending
* with local-mac-addr so this isn't
* our mac address. */
continue;
}
mac_addr = strtoull(&userdata[i + 15], &end, 16);
/* Remove the "local-mac-addr=<...>" from the kernel
* command line, including the tailing space if
* present. */
if (*end == ' ')
end++;
len = ((int) end) - ((int) &userdata[i]);
memmove(&userdata[i], end,
userdata_len - (len + i) + 1);
break;
}
}
loader_info.cmdline = userdata;
loader_info.cmdline_len = 256;
ibm_akebono_memsize = ibm_akebono_detect_memsize();
if (ibm_akebono_memsize >> 32)
end_of_ram = ~0UL;
else
end_of_ram = ibm_akebono_memsize;
avail_ram = end_of_ram - (unsigned long)_end;
simple_alloc_init(_end, avail_ram, 128, 64);
platform_ops.fixups = ibm_akebono_fixups;
platform_ops.exit = ibm44x_dbcr_reset;
pir_reg = mfspr(SPRN_PIR);
/* Make sure FDT blob is sane */
if (fdt_check_header(_dtb_start) != 0)
fatal("Invalid device tree blob
");
node = fdt_node_offset_by_prop_value(_dtb_start, -1, "device_type",
"cpu", sizeof("cpu"));
if (!node)
fatal("Cannot find cpu node
");
timebase = fdt_getprop(_dtb_start, node, "timebase-frequency", &size);
if (timebase && (size == 4))
timebase_period_ns = 1000000000 / *timebase;
fdt_set_boot_cpuid_phys(_dtb_start, pir_reg);
fdt_init(_dtb_start);
serial_console_init();
}
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