Linux-2.6.33.2/arch/mn10300/kernel/setup.c
/* MN10300 Arch-specific initialisation
*
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public Licence
* as published by the Free Software Foundation; either version
* 2 of the Licence, or (at your option) any later version.
*/
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/user.h>
#include <linux/tty.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/seq_file.h>
#include <asm/processor.h>
#include <linux/console.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <asm/setup.h>
#include <asm/io.h>
#include <asm/smp.h>
#include <proc/proc.h>
#include <asm/busctl-regs.h>
#include <asm/fpu.h>
#include <asm/sections.h>
struct mn10300_cpuinfo boot_cpu_data;
/* For PCI or other memory-mapped resources */
unsigned long pci_mem_start = 0x18000000;
char redboot_command_line[COMMAND_LINE_SIZE] =
"console=ttyS0,115200 root=/dev/mtdblock3 rw";
char __initdata redboot_platform_name[COMMAND_LINE_SIZE];
static struct resource code_resource = {
.start = 0x100000,
.end = 0,
.name = "Kernel code",
};
static struct resource data_resource = {
.start = 0,
.end = 0,
.name = "Kernel data",
};
static unsigned long __initdata phys_memory_base;
static unsigned long __initdata phys_memory_end;
static unsigned long __initdata memory_end;
unsigned long memory_size;
struct thread_info *__current_ti = &init_thread_union.thread_info;
struct task_struct *__current = &init_task;
#define mn10300_known_cpus 3
static const char *const mn10300_cputypes[] = {
"am33v1",
"am33v2",
"am34v1",
"unknown"
};
/*
*
*/
static void __init parse_mem_cmdline(char **cmdline_p)
{
char *from, *to, c;
/* save unparsed command line copy for /proc/cmdline */
strcpy(boot_command_line, redboot_command_line);
/* see if there's an explicit memory size option */
from = redboot_command_line;
to = redboot_command_line;
c = ' ';
for (;;) {
if (c == ' ' && !memcmp(from, "mem=", 4)) {
if (to != redboot_command_line)
to--;
memory_size = memparse(from + 4, &from);
}
c = *(from++);
if (!c)
break;
*(to++) = c;
}
*to = '\0';
*cmdline_p = redboot_command_line;
if (memory_size == 0)
panic("Memory size not known\n");
memory_end = (unsigned long) CONFIG_KERNEL_RAM_BASE_ADDRESS +
memory_size;
if (memory_end > phys_memory_end)
memory_end = phys_memory_end;
}
/*
* architecture specific setup
*/
void __init setup_arch(char **cmdline_p)
{
unsigned long bootmap_size;
unsigned long kstart_pfn, start_pfn, free_pfn, end_pfn;
cpu_init();
unit_setup();
parse_mem_cmdline(cmdline_p);
init_mm.start_code = (unsigned long)&_text;
init_mm.end_code = (unsigned long) &_etext;
init_mm.end_data = (unsigned long) &_edata;
init_mm.brk = (unsigned long) &_end;
code_resource.start = virt_to_bus(&_text);
code_resource.end = virt_to_bus(&_etext)-1;
data_resource.start = virt_to_bus(&_etext);
data_resource.end = virt_to_bus(&_edata)-1;
start_pfn = (CONFIG_KERNEL_RAM_BASE_ADDRESS >> PAGE_SHIFT);
kstart_pfn = PFN_UP(__pa(&_text));
free_pfn = PFN_UP(__pa(&_end));
end_pfn = PFN_DOWN(__pa(memory_end));
bootmap_size = init_bootmem_node(&contig_page_data,
free_pfn,
start_pfn,
end_pfn);
if (kstart_pfn > start_pfn)
free_bootmem(PFN_PHYS(start_pfn),
PFN_PHYS(kstart_pfn - start_pfn));
free_bootmem(PFN_PHYS(free_pfn),
PFN_PHYS(end_pfn - free_pfn));
/* If interrupt vector table is in main ram, then we need to
reserve the page it is occupying. */
if (CONFIG_INTERRUPT_VECTOR_BASE >= CONFIG_KERNEL_RAM_BASE_ADDRESS &&
CONFIG_INTERRUPT_VECTOR_BASE < memory_end)
reserve_bootmem(CONFIG_INTERRUPT_VECTOR_BASE, PAGE_SIZE,
BOOTMEM_DEFAULT);
reserve_bootmem(PAGE_ALIGN(PFN_PHYS(free_pfn)), bootmap_size,
BOOTMEM_DEFAULT);
#ifdef CONFIG_VT
#if defined(CONFIG_VGA_CONSOLE)
conswitchp = &vga_con;
#elif defined(CONFIG_DUMMY_CONSOLE)
conswitchp = &dummy_con;
#endif
#endif
paging_init();
}
/*
* perform CPU initialisation
*/
void __init cpu_init(void)
{
unsigned long cpurev = CPUREV, type;
unsigned long base, size;
type = (CPUREV & CPUREV_TYPE) >> CPUREV_TYPE_S;
if (type > mn10300_known_cpus)
type = mn10300_known_cpus;
printk(KERN_INFO "Matsushita %s, rev %ld\n",
mn10300_cputypes[type],
(cpurev & CPUREV_REVISION) >> CPUREV_REVISION_S);
/* determine the memory size and base from the memory controller regs */
memory_size = 0;
base = SDBASE(0);
if (base & SDBASE_CE) {
size = (base & SDBASE_CBAM) << SDBASE_CBAM_SHIFT;
size = ~size + 1;
base &= SDBASE_CBA;
printk(KERN_INFO "SDRAM[0]: %luMb @%08lx\n", size >> 20, base);
memory_size += size;
phys_memory_base = base;
}
base = SDBASE(1);
if (base & SDBASE_CE) {
size = (base & SDBASE_CBAM) << SDBASE_CBAM_SHIFT;
size = ~size + 1;
base &= SDBASE_CBA;
printk(KERN_INFO "SDRAM[1]: %luMb @%08lx\n", size >> 20, base);
memory_size += size;
if (phys_memory_base == 0)
phys_memory_base = base;
}
phys_memory_end = phys_memory_base + memory_size;
#ifdef CONFIG_FPU
fpu_init_state();
#endif
}
/*
* Get CPU information for use by the procfs.
*/
static int show_cpuinfo(struct seq_file *m, void *v)
{
unsigned long cpurev = CPUREV, type, icachesz, dcachesz;
type = (CPUREV & CPUREV_TYPE) >> CPUREV_TYPE_S;
if (type > mn10300_known_cpus)
type = mn10300_known_cpus;
icachesz =
((cpurev & CPUREV_ICWAY ) >> CPUREV_ICWAY_S) *
((cpurev & CPUREV_ICSIZE) >> CPUREV_ICSIZE_S) *
1024;
dcachesz =
((cpurev & CPUREV_DCWAY ) >> CPUREV_DCWAY_S) *
((cpurev & CPUREV_DCSIZE) >> CPUREV_DCSIZE_S) *
1024;
seq_printf(m,
"processor : 0\n"
"vendor_id : Matsushita\n"
"cpu core : %s\n"
"cpu rev : %lu\n"
"model name : " PROCESSOR_MODEL_NAME "\n"
"icache size: %lu\n"
"dcache size: %lu\n",
mn10300_cputypes[type],
(cpurev & CPUREV_REVISION) >> CPUREV_REVISION_S,
icachesz,
dcachesz
);
seq_printf(m,
"ioclk speed: %lu.%02luMHz\n"
"bogomips : %lu.%02lu\n\n",
MN10300_IOCLK / 1000000,
(MN10300_IOCLK / 10000) % 100,
loops_per_jiffy / (500000 / HZ),
(loops_per_jiffy / (5000 / HZ)) % 100
);
return 0;
}
static void *c_start(struct seq_file *m, loff_t *pos)
{
return *pos < NR_CPUS ? cpu_data + *pos : NULL;
}
static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
++*pos;
return c_start(m, pos);
}
static void c_stop(struct seq_file *m, void *v)
{
}
const struct seq_operations cpuinfo_op = {
.start = c_start,
.next = c_next,
.stop = c_stop,
.show = show_cpuinfo,
};