125 lines
2.7 KiB
C
125 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* RouterBoard 500 specific prom routines
|
|
*
|
|
* Copyright (C) 2003, Peter Sadik <peter.sadik@idt.com>
|
|
* Copyright (C) 2005-2006, P.Christeas <p_christ@hol.gr>
|
|
* Copyright (C) 2007, Gabor Juhos <juhosg@openwrt.org>
|
|
* Felix Fietkau <nbd@openwrt.org>
|
|
* Florian Fainelli <florian@openwrt.org>
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/export.h>
|
|
#include <linux/string.h>
|
|
#include <linux/console.h>
|
|
#include <linux/memblock.h>
|
|
#include <linux/ioport.h>
|
|
|
|
#include <asm/bootinfo.h>
|
|
#include <asm/mach-rc32434/ddr.h>
|
|
#include <asm/mach-rc32434/prom.h>
|
|
|
|
unsigned int idt_cpu_freq = 132000000;
|
|
EXPORT_SYMBOL(idt_cpu_freq);
|
|
|
|
static struct resource ddr_reg[] = {
|
|
{
|
|
.name = "ddr-reg",
|
|
.start = DDR0_PHYS_ADDR,
|
|
.end = DDR0_PHYS_ADDR + sizeof(struct ddr_ram),
|
|
.flags = IORESOURCE_MEM,
|
|
}
|
|
};
|
|
|
|
static inline int match_tag(char *arg, const char *tag)
|
|
{
|
|
return strncmp(arg, tag, strlen(tag)) == 0;
|
|
}
|
|
|
|
static inline unsigned long tag2ul(char *arg, const char *tag)
|
|
{
|
|
char *num;
|
|
|
|
num = arg + strlen(tag);
|
|
return simple_strtoul(num, 0, 10);
|
|
}
|
|
|
|
void __init prom_setup_cmdline(void)
|
|
{
|
|
static char cmd_line[COMMAND_LINE_SIZE] __initdata;
|
|
char *cp, *board;
|
|
int prom_argc;
|
|
char **prom_argv;
|
|
int i;
|
|
|
|
prom_argc = fw_arg0;
|
|
prom_argv = (char **) fw_arg1;
|
|
|
|
cp = cmd_line;
|
|
/* Note: it is common that parameters start
|
|
* at argv[1] and not argv[0],
|
|
* however, our elf loader starts at [0] */
|
|
for (i = 0; i < prom_argc; i++) {
|
|
if (match_tag(prom_argv[i], FREQ_TAG)) {
|
|
idt_cpu_freq = tag2ul(prom_argv[i], FREQ_TAG);
|
|
continue;
|
|
}
|
|
#ifdef IGNORE_CMDLINE_MEM
|
|
/* parses out the "mem=xx" arg */
|
|
if (match_tag(prom_argv[i], MEM_TAG))
|
|
continue;
|
|
#endif
|
|
if (i > 0)
|
|
*(cp++) = ' ';
|
|
if (match_tag(prom_argv[i], BOARD_TAG)) {
|
|
board = prom_argv[i] + strlen(BOARD_TAG);
|
|
|
|
if (match_tag(board, BOARD_RB532A))
|
|
mips_machtype = MACH_MIKROTIK_RB532A;
|
|
else
|
|
mips_machtype = MACH_MIKROTIK_RB532;
|
|
}
|
|
|
|
strcpy(cp, prom_argv[i]);
|
|
cp += strlen(prom_argv[i]);
|
|
}
|
|
*(cp++) = ' ';
|
|
|
|
i = strlen(arcs_cmdline);
|
|
if (i > 0) {
|
|
*(cp++) = ' ';
|
|
strcpy(cp, arcs_cmdline);
|
|
cp += strlen(arcs_cmdline);
|
|
}
|
|
cmd_line[COMMAND_LINE_SIZE - 1] = '\0';
|
|
|
|
strcpy(arcs_cmdline, cmd_line);
|
|
}
|
|
|
|
void __init prom_init(void)
|
|
{
|
|
struct ddr_ram __iomem *ddr;
|
|
phys_addr_t memsize;
|
|
phys_addr_t ddrbase;
|
|
|
|
ddr = ioremap(ddr_reg[0].start,
|
|
ddr_reg[0].end - ddr_reg[0].start);
|
|
|
|
if (!ddr) {
|
|
printk(KERN_ERR "Unable to remap DDR register\n");
|
|
return;
|
|
}
|
|
|
|
ddrbase = (phys_addr_t)&ddr->ddrbase;
|
|
memsize = (phys_addr_t)&ddr->ddrmask;
|
|
memsize = 0 - memsize;
|
|
|
|
prom_setup_cmdline();
|
|
|
|
/* give all RAM to boot allocator,
|
|
* except for the first 0x400 and the last 0x200 bytes */
|
|
memblock_add(ddrbase + 0x400, memsize - 0x600);
|
|
}
|