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// 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);
}
static 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);
}
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