/*
* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
*
* 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 <linux/seq_file.h>
#include <linux/fs.h>
#include <linux/delay.h>
#include <linux/root_dev.h>
#include <linux/console.h>
#include <linux/module.h>
#include <linux/cpu.h>
#include <linux/of_fdt.h>
#include <asm/sections.h>
#include <asm/arcregs.h>
#include <asm/tlb.h>
#include <asm/cache.h>
#include <asm/setup.h>
#include <asm/page.h>
#include <asm/irq.h>
#include <asm/arcregs.h>
#include <asm/prom.h>
#define FIX_PTR(x) __asm__ __volatile__(";" : "+r"(x))
int running_on_hw = 1; /* vs. on ISS */
char __initdata command_line[COMMAND_LINE_SIZE];
struct task_struct *_current_task[NR_CPUS]; /* For stack switching */
struct cpuinfo_arc cpuinfo_arc700[NR_CPUS];
void __init read_arc_build_cfg_regs(void)
{
read_decode_mmu_bcr();
read_decode_cache_bcr();
}
/*
* Initialize and setup the processor core
* This is called by all the CPUs thus should not do special case stuff
* such as only for boot CPU etc
*/
void __init setup_processor(void)
{
read_arc_build_cfg_regs();
arc_init_IRQ();
arc_mmu_init();
arc_cache_init();
}
void __init __attribute__((weak)) arc_platform_early_init(void)
{
}
void __init setup_arch(char **cmdline_p)
{
int rc;
#ifdef CONFIG_CMDLINE_UBOOT
/* Make sure that a whitespace is inserted before */
strlcat(command_line, " ", sizeof(command_line));
#endif
/*
* Append .config cmdline to base command line, which might already
* contain u-boot "bootargs" (handled by head.S, if so configured)
*/
strlcat(command_line, CONFIG_CMDLINE, sizeof(command_line));
/* Save unparsed command line copy for /proc/cmdline */
strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
*cmdline_p = command_line;
rc = setup_machine_fdt(__dtb_start);
/* To force early parsing of things like mem=xxx */
parse_early_param();
/* Platform/board specific: e.g. early console registration */
arc_platform_early_init();
setup_processor();
setup_arch_memory();
unflatten_device_tree();
/* Can be issue if someone passes cmd line arg "ro"
* But that is unlikely so keeping it as it is
*/
root_mountflags &= ~MS_RDONLY;
console_verbose();
#if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE)
conswitchp = &dummy_con;
#endif
}
/*
* Get CPU information for use by the procfs.
*/
#define cpu_to_ptr(c) ((void *)(0xFFFF0000 | (unsigned int)(c)))
#define ptr_to_cpu(p) (~0xFFFF0000UL & (unsigned int)(p))
static int show_cpuinfo(struct seq_file *m, void *v)
{
char *str;
int cpu_id = ptr_to_cpu(v);
str = (char *)__get_free_page(GFP_TEMPORARY);
if (!str)
goto done;
seq_printf(m, "ARC700 #%d\n", cpu_id);
seq_printf(m, "Bogo MIPS : \t%lu.%02lu\n",
loops_per_jiffy / (500000 / HZ),
(loops_per_jiffy / (5000 / HZ)) % 100);
free_page((unsigned long)str);
done:
seq_printf(m, "\n\n");
return 0;
}
static void *c_start(struct seq_file *m, loff_t *pos)
{
/*
* Callback returns cpu-id to iterator for show routine, NULL to stop.
* However since NULL is also a valid cpu-id (0), we use a round-about
* way to pass it w/o having to kmalloc/free a 2 byte string.
* Encode cpu-id as 0xFFcccc, which is decoded by show routine.
*/
return *pos < num_possible_cpus() ? cpu_to_ptr(*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
};
static DEFINE_PER_CPU(struct cpu, cpu_topology);
static int __init topology_init(void)
{
int cpu;
for_each_present_cpu(cpu)
register_cpu(&per_cpu(cpu_topology, cpu), cpu);
return 0;
}
subsys_initcall(topology_init);
