u-boot/lib_avr32/avr32_linux.c

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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 <zlib.h>
#include <asm/byteorder.h>
#include <asm/addrspace.h>
#include <asm/io.h>
#include <asm/setup.h>
#include <asm/arch/platform.h>
DECLARE_GLOBAL_DATA_PTR;
extern int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
/* CPU-specific hook to allow flushing of caches, etc. */
extern void prepare_to_boot(void);
#ifdef CONFIG_SHOW_BOOT_PROGRESS
# include <status_led.h>
# define SHOW_BOOT_PROGRESS(arg) show_boot_progress(arg)
#else
# define SHOW_BOOT_PROGRESS(arg)
#endif
extern image_header_t header; /* from cmd_bootm.c */
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->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 = pm_get_clock_freq(CLOCK_HSB);
#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 void setup_end_tag(struct tag *params)
{
params->hdr.tag = ATAG_NONE;
params->hdr.size = 0;
}
void do_bootm_linux(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[],
unsigned long addr, unsigned long *len_ptr, int verify)
{
unsigned long data, len = 0;
unsigned long initrd_start, initrd_end;
unsigned long image_start, image_end;
unsigned long checksum;
void (*theKernel)(int magic, void *tagtable);
image_header_t *hdr;
struct tag *params, *params_start;
char *commandline = getenv("bootargs");
hdr = (image_header_t *)addr;
image_start = addr;
image_end = addr + hdr->ih_size;
theKernel = (void *)ntohl(hdr->ih_ep);
/*
* Check if there is an initrd image
*/
if (argc >= 3) {
SHOW_BOOT_PROGRESS(9);
addr = simple_strtoul(argv[2], NULL, 16);
printf("## Loading RAMDISK image at %08lx ...\n", addr);
memcpy(&header, (char *)addr, sizeof(header));
hdr = &header;
if (ntohl(hdr->ih_magic) != IH_MAGIC) {
puts("Bad Magic Number\n");
SHOW_BOOT_PROGRESS(-10);
do_reset(cmdtp, flag, argc, argv);
}
data = (unsigned long)hdr;
len = sizeof(*hdr);
checksum = ntohl(hdr->ih_hcrc);
hdr->ih_hcrc = 0;
if (crc32(0, (unsigned char *)data, len) != checksum) {
puts("Bad Header Checksum\n");
SHOW_BOOT_PROGRESS(-11);
do_reset(cmdtp, flag, argc, argv);
}
SHOW_BOOT_PROGRESS(10);
print_image_hdr(hdr);
data = addr + sizeof(header);
len = ntohl(hdr->ih_size);
if (verify) {
unsigned long csum = 0;
puts(" Verifying Checksum ... ");
csum = crc32(0, (unsigned char *)data, len);
if (csum != ntohl(hdr->ih_dcrc)) {
puts("Bad Data CRC\n");
SHOW_BOOT_PROGRESS(-12);
do_reset(cmdtp, flag, argc, argv);
}
puts("OK\n");
}
SHOW_BOOT_PROGRESS(11);
if ((hdr->ih_os != IH_OS_LINUX) ||
(hdr->ih_arch != IH_CPU_AVR32) ||
(hdr->ih_type != IH_TYPE_RAMDISK)) {
puts("Not a Linux/AVR32 RAMDISK image\n");
SHOW_BOOT_PROGRESS(-13);
do_reset(cmdtp, flag, argc, argv);
}
} else if ((hdr->ih_type == IH_TYPE_MULTI) && (len_ptr[1])) {
ulong tail = ntohl (len_ptr[0]) % 4;
int i;
SHOW_BOOT_PROGRESS (13);
/* skip kernel length and terminator */
data = (ulong) (&len_ptr[2]);
/* skip any additional image length fields */
for (i = 1; len_ptr[i]; ++i)
data += 4;
/* add kernel length, and align */
data += ntohl (len_ptr[0]);
if (tail) {
data += 4 - tail;
}
len = ntohl (len_ptr[1]);
} else {
/* no initrd image */
SHOW_BOOT_PROGRESS(14);
len = data = 0;
}
if (data) {
initrd_start = data;
initrd_end = initrd_start + len;
} else {
initrd_start = 0;
initrd_end = 0;
}
SHOW_BOOT_PROGRESS(15);
params = params_start = (struct tag *)gd->bd->bi_boot_params;
params = setup_start_tag(params);
params = setup_memory_tags(params);
if (initrd_start) {
params = setup_ramdisk_tag(params,
PHYSADDR(initrd_start),
PHYSADDR(initrd_end));
}
params = setup_commandline_tag(params, commandline);
params = setup_clock_tags(params);
params = setup_ethernet_tags(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);
}