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/*
* Copyright (C) 2004-2006 Atmel Corporation
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <command.h>
#include <image.h>
#include <u-boot/zlib.h>
#include <asm/byteorder.h>
#include <asm/arch/addrspace.h>
#include <asm/io.h>
#include <asm/setup.h>
#include <asm/arch/clk.h>
DECLARE_GLOBAL_DATA_PTR;
/* CPU-specific hook to allow flushing of caches, etc. */
extern void prepare_to_boot(void);
static struct tag *setup_start_tag(struct tag *params)
{
params->hdr.tag = ATAG_CORE;
params->hdr.size = tag_size(tag_core);
params->u.core.flags = 0;
params->u.core.pagesize = 4096;
params->u.core.rootdev = 0;
return tag_next(params);
}
static struct tag *setup_memory_tags(struct tag *params)
{
bd_t *bd = gd->bd;
int i;
for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
params->hdr.tag = ATAG_MEM;
params->hdr.size = tag_size(tag_mem_range);
params->u.mem_range.addr = bd->bi_dram[i].start;
params->u.mem_range.size = bd->bi_dram[i].size;
params = tag_next(params);
}
return params;
}
static struct tag *setup_commandline_tag(struct tag *params, char *cmdline)
{
if (!cmdline)
return params;
/* eat leading white space */
while (*cmdline == ' ') cmdline++;
/*
* Don't include tags for empty command lines; let the kernel
* use its default command line.
*/
if (*cmdline == '\0')
return params;
params->hdr.tag = ATAG_CMDLINE;
params->hdr.size =
(sizeof (struct tag_header) + strlen(cmdline) + 1 + 3) >> 2;
strcpy(params->u.cmdline.cmdline, cmdline);
return tag_next(params);
}
static struct tag *setup_ramdisk_tag(struct tag *params,
unsigned long rd_start,
unsigned long rd_end)
{
if (rd_start == rd_end)
return params;
params->hdr.tag = ATAG_RDIMG;
params->hdr.size = tag_size(tag_mem_range);
params->u.mem_range.addr = rd_start;
params->u.mem_range.size = rd_end - rd_start;
return tag_next(params);
}
static struct tag *setup_clock_tags(struct tag *params)
{
params->hdr.tag = ATAG_CLOCK;
params->hdr.size = tag_size(tag_clock);
params->u.clock.clock_id = ACLOCK_BOOTCPU;
params->u.clock.clock_flags = 0;
params->u.clock.clock_hz = gd->arch.cpu_hz;
#ifdef CONFIG_AT32AP7000
/*
* New kernels don't need this, but we should be backwards
* compatible for a while...
*/
params = tag_next(params);
params->hdr.tag = ATAG_CLOCK;
params->hdr.size = tag_size(tag_clock);
params->u.clock.clock_id = ACLOCK_HSB;
params->u.clock.clock_flags = 0;
params->u.clock.clock_hz = get_hsb_clk_rate();
#endif
return tag_next(params);
}
static struct tag *setup_ethernet_tag(struct tag *params,
char *addr, int index)
{
char *s, *e;
int i;
params->hdr.tag = ATAG_ETHERNET;
params->hdr.size = tag_size(tag_ethernet);
params->u.ethernet.mac_index = index;
params->u.ethernet.mii_phy_addr = gd->bd->bi_phy_id[index];
s = addr;
for (i = 0; i < 6; i++) {
params->u.ethernet.hw_address[i] = simple_strtoul(s, &e, 16);
s = e + 1;
}
return tag_next(params);
}
static struct tag *setup_ethernet_tags(struct tag *params)
{
char name[16] = "ethaddr";
char *addr;
int i = 0;
do {
addr = getenv(name);
if (addr)
params = setup_ethernet_tag(params, addr, i);
sprintf(name, "eth%daddr", ++i);
} while (i < 4);
return params;
}
static struct tag *setup_boardinfo_tag(struct tag *params)
{
params->hdr.tag = ATAG_BOARDINFO;
params->hdr.size = tag_size(tag_boardinfo);
params->u.boardinfo.board_number = gd->bd->bi_board_number;
return tag_next(params);
}
static void setup_end_tag(struct tag *params)
{
params->hdr.tag = ATAG_NONE;
params->hdr.size = 0;
}
int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *images)
{
void (*theKernel)(int magic, void *tagtable);
struct tag *params, *params_start;
char *commandline = getenv("bootargs");
/*
* allow the PREP bootm subcommand, it is required for bootm to work
*
* TODO: Andreas Bießmann <andreas.devel@googlemail.com> refactor the
* do_bootm_linux() for avr32
*/
if (flag & BOOTM_STATE_OS_PREP)
return 0;
if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
return 1;
theKernel = (void *)images->ep;
bootstage_mark(BOOTSTAGE_ID_RUN_OS);
params = params_start = (struct tag *)gd->bd->bi_boot_params;
params = setup_start_tag(params);
params = setup_memory_tags(params);
if (images->rd_start) {
params = setup_ramdisk_tag(params,
PHYSADDR(images->rd_start),
PHYSADDR(images->rd_end));
}
params = setup_commandline_tag(params, commandline);
params = setup_clock_tags(params);
params = setup_ethernet_tags(params);
params = setup_boardinfo_tag(params);
setup_end_tag(params);
printf("\nStarting kernel at %p (params at %p)...\n\n",
theKernel, params_start);
prepare_to_boot();
theKernel(ATAG_MAGIC, params_start);
/* does not return */
return 1;
}
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