diff options
Diffstat (limited to 'kernel/arch/mips/rb532/prom.c')
| -rw-r--r-- | kernel/arch/mips/rb532/prom.c | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/kernel/arch/mips/rb532/prom.c b/kernel/arch/mips/rb532/prom.c new file mode 100644 index 000000000..657210e76 --- /dev/null +++ b/kernel/arch/mips/rb532/prom.c @@ -0,0 +1,145 @@ +/* + * 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> + * + * 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., 51 Franklin Street, Fifth Floor, + * Boston, MA 02110-1301, USA. + * + */ + +#include <linux/init.h> +#include <linux/mm.h> +#include <linux/module.h> +#include <linux/string.h> +#include <linux/console.h> +#include <linux/bootmem.h> +#include <linux/ioport.h> +#include <linux/blkdev.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, + } +}; + +void __init prom_free_prom_memory(void) +{ + /* No prom memory to free */ +} + +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_nocache(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 */ + add_memory_region(ddrbase + 0x400, memsize - 0x600, BOOT_MEM_RAM); +} |