/*
* Copyright (C) 2004-2006 Atmel Corporation
*
* 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/clk.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/console.h>
#include <linux/ioport.h>
#include <linux/bootmem.h>
#include <linux/fs.h>
#include <linux/module.h>
#include <linux/root_dev.h>
#include <linux/cpu.h>
#include <linux/kernel.h>
#include <asm/sections.h>
#include <asm/processor.h>
#include <asm/pgtable.h>
#include <asm/setup.h>
#include <asm/sysreg.h>
#include <asm/arch/board.h>
#include <asm/arch/init.h>
extern int root_mountflags;
/*
* Bootloader-provided information about physical memory
*/
struct tag_mem_range *mem_phys;
struct tag_mem_range *mem_reserved;
struct tag_mem_range *mem_ramdisk;
/*
* Initialize loops_per_jiffy as 5000000 (500MIPS).
* Better make it too large than too small...
*/
struct avr32_cpuinfo boot_cpu_data = {
.loops_per_jiffy = 5000000
};
EXPORT_SYMBOL(boot_cpu_data);
static char __initdata command_line[COMMAND_LINE_SIZE];
/*
* Should be more than enough, but if you have a _really_ complex
* setup, you might need to increase the size of this...
*/
static struct tag_mem_range __initdata mem_range_cache[32];
static unsigned mem_range_next_free;
/*
* Standard memory resources
*/
static struct resource mem_res[] = {
{
.name = "Kernel code",
.start = 0,
.end = 0,
.flags = IORESOURCE_MEM
},
{
.name = "Kernel data",
.start = 0,
.end = 0,
.flags = IORESOURCE_MEM,
},
};
#define kernel_code mem_res[0]
#define kernel_data mem_res[1]
/*
* Early framebuffer allocation. Works as follows:
* - If fbmem_size is zero, nothing will be allocated or reserved.
* - If fbmem_start is zero when setup_bootmem() is called,
* fbmem_size bytes will be allocated from the bootmem allocator.
* - If fbmem_start is nonzero, an area of size fbmem_size will be
* reserved at the physical address fbmem_start if necessary. If
* the area isn't in a memory region known to the kernel, it will
* be left alone.
*
* Board-specific code may use these variables to set up platform data
* for the framebuffer driver if fbmem_size is nonzero.
*/
static unsigned long __initdata fbmem_start;
static unsigned long __initdata fbmem_size;
/*
* "fbmem=xxx[kKmM]" allocates the specified amount of boot memory for
* use as framebuffer.
*
* "fbmem=xxx[kKmM]@yyy[kKmM]" defines a memory region of size xxx and
* starting at yyy to be reserved for use as framebuffer.
*
* The kernel won't verify that the memory region starting at yyy
* actually contains usable RAM.
*/
static int __init early_parse_fbmem(char *p)
{
fbmem_size = memparse(p, &p);
if (*p == '@')
fbmem_start = memparse(p, &p);
return 0;
}
early_param("fbmem", early_parse_fbmem);
static inline void __init resource_init(void)
{
struct tag_mem_range *region;
kernel_code.start = __pa(init_mm.start_code);
kernel_code.end = __pa(init_mm.end_code - 1);
kernel_data.start = __pa(init_mm.end_code);
kernel_data.end = __pa(init_mm.brk - 1);
for (region = mem_phys; region; region = region->next) {
struct resource *res;
unsigned long phys_start, phys_end;
if (region->size == 0)
continue;
phys_start = region->addr;
phys_end = phys_start + region->size - 1;
res = alloc_bootmem_low(sizeof(*res));
res->name = "System RAM";
res->start = phys_start;
res->end = phys_end;
res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
request_resource (&iomem_resource, res);
if (kernel_code.start >= res->start &&
kernel_code.end <= res->end)
request_resource (res, &kernel_code);
if (kernel_data.start >= res->start &&
kernel_data.end <= res->end)
request_resource (res, &kernel_data);
}
}
static int __init parse_tag_core(struct tag *tag)
{
if (tag->hdr.size > 2) {
if ((tag->u.core.flags & 1) == 0)
root_mountflags &= ~MS_RDONLY;
ROOT_DEV = new_decode_dev(tag->u.core.rootdev);
}
return 0;
}
__tagtable(ATAG_CORE, parse_tag_core);
static int __init parse_tag_mem_range(struct tag *tag,
struct tag_mem_range **root)
{
struct tag_mem_range *cur, **pprev;
struct tag_mem_range *new;
/*
* Ignore zero-sized entries. If we're running standalone, the
* SDRAM code may emit such entries if something goes
* wrong...
*/
if (tag->u.mem_range.size == 0)
return 0;
/*
* Copy the data so the bootmem init code doesn't need to care
* about it.
*/
if (mem_range_next_free >= ARRAY_SIZE(mem_range_cache))
panic("Physical memory map too complex!\n");
new = &mem_range_cache[mem_range_next_free++];
*new = tag->u.mem_range;
pprev = root;
cur = *root;
while (cur) {
pprev = &cur->next;
cur = cur->next;
}
*pprev = new;
new->next = NULL;
return 0;
}
static int __init parse_tag_mem(struct tag *tag)
{
return parse_tag_mem_range(tag, &mem_phys);
}
__tagtable(ATAG_MEM, parse_tag_mem);
static int __init parse_tag_cmdline(struct tag *tag)
{
strlcpy(boot_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
return 0;
}
__tagtable(ATAG_CMDLINE, parse_tag_cmdline);
static int __init parse_tag_rdimg(struct tag *tag)
{
return parse_tag_mem_range(tag, &mem_ramdisk);
}
__tagtable(ATAG_RDIMG, parse_tag_rdimg);
static int __init parse_tag_clock(struct tag *tag)
{
/*
* We'll figure out the clocks by peeking at the system
* manager regs directly.
*/
return 0;
}
__tagtable(ATAG_CLOCK, parse_tag_clock);
static int __init parse_tag_rsvd_mem(struct tag *tag)
{
return parse_tag_mem_range(tag, &mem_reserved);
}
__tagtable(ATAG_RSVD_MEM, parse_tag_rsvd_mem);
/*
* Scan the tag table for this tag, and call its parse function. The
* tag table is built by the linker from all the __tagtable
* declarations.
*/
static int __init parse_tag(struct tag *tag)
{
extern struct tagtable __tagtable_begin, __tagtable_end;
struct tagtable *t;
for (t = &__tagtable_begin; t < &__tagtable_end; t++)
if (tag->hdr.tag == t->tag) {
t->parse(tag);
break;
}
return t < &__tagtable_end;
}
/*
* Parse all tags in the list we got from the boot loader
*/
static void __init parse_tags(struct tag *t)
{
for (; t->hdr.tag != ATAG_NONE; t = tag_next(t))
if (!parse_tag(t))
printk(KERN_WARNING
"Ignoring unrecognised tag 0x%08x\n",
t->hdr.tag);
}
void __init setup_arch (char **cmdline_p)
{
struct clk *cpu_clk;
parse_tags(bootloader_tags);
setup_processor();
setup_platform();
setup_board();
cpu_clk = clk_get(NULL, "cpu");
if (IS_ERR(cpu_clk)) {
printk(KERN_WARNING "Warning: Unable to get CPU clock\n");
} else {
unsigned long cpu_hz = clk_get_rate(cpu_clk);
/*
* Well, duh, but it's probably a good idea to
* increment the use count.
*/
clk_enable(cpu_clk);
boot_cpu_data.clk = cpu_clk;
boot_cpu_data.loops_per_jiffy = cpu_hz * 4;
printk("CPU: Running at %lu.%03lu MHz\n",
((cpu_hz + 500) / 1000) / 1000,
((cpu_hz + 500) / 1000) % 1000);
}
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;
strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
*cmdline_p = command_line;
parse_early_param();
setup_bootmem();
board_setup_fbmem(fbmem_start, fbmem_size);
#ifdef CONFIG_VT
conswitchp = &dummy_con;
#endif
paging_init();
resource_init();
}
