1 /* 2 * RouterBoard 500 specific prom routines 3 * 4 * Copyright (C) 2003, Peter Sadik <peter.sadik@idt.com> 5 * Copyright (C) 2005-2006, P.Christeas <p_christ@hol.gr> 6 * Copyright (C) 2007, Gabor Juhos <juhosg@openwrt.org> 7 * Felix Fietkau <nbd@openwrt.org> 8 * Florian Fainelli <florian@openwrt.org> 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License 12 * as published by the Free Software Foundation; either version 2 13 * of the License, or (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, write to the 22 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 23 * Boston, MA 02110-1301, USA. 24 * 25 */ 26 27 #include <linux/init.h> 28 #include <linux/mm.h> 29 #include <linux/export.h> 30 #include <linux/string.h> 31 #include <linux/console.h> 32 #include <linux/bootmem.h> 33 #include <linux/ioport.h> 34 #include <linux/blkdev.h> 35 36 #include <asm/bootinfo.h> 37 #include <asm/mach-rc32434/ddr.h> 38 #include <asm/mach-rc32434/prom.h> 39 40 unsigned int idt_cpu_freq = 132000000; 41 EXPORT_SYMBOL(idt_cpu_freq); 42 43 static struct resource ddr_reg[] = { 44 { 45 .name = "ddr-reg", 46 .start = DDR0_PHYS_ADDR, 47 .end = DDR0_PHYS_ADDR + sizeof(struct ddr_ram), 48 .flags = IORESOURCE_MEM, 49 } 50 }; 51 52 void __init prom_free_prom_memory(void) 53 { 54 /* No prom memory to free */ 55 } 56 57 static inline int match_tag(char *arg, const char *tag) 58 { 59 return strncmp(arg, tag, strlen(tag)) == 0; 60 } 61 62 static inline unsigned long tag2ul(char *arg, const char *tag) 63 { 64 char *num; 65 66 num = arg + strlen(tag); 67 return simple_strtoul(num, 0, 10); 68 } 69 70 void __init prom_setup_cmdline(void) 71 { 72 static char cmd_line[COMMAND_LINE_SIZE] __initdata; 73 char *cp, *board; 74 int prom_argc; 75 char **prom_argv; 76 int i; 77 78 prom_argc = fw_arg0; 79 prom_argv = (char **) fw_arg1; 80 81 cp = cmd_line; 82 /* Note: it is common that parameters start 83 * at argv[1] and not argv[0], 84 * however, our elf loader starts at [0] */ 85 for (i = 0; i < prom_argc; i++) { 86 if (match_tag(prom_argv[i], FREQ_TAG)) { 87 idt_cpu_freq = tag2ul(prom_argv[i], FREQ_TAG); 88 continue; 89 } 90 #ifdef IGNORE_CMDLINE_MEM 91 /* parses out the "mem=xx" arg */ 92 if (match_tag(prom_argv[i], MEM_TAG)) 93 continue; 94 #endif 95 if (i > 0) 96 *(cp++) = ' '; 97 if (match_tag(prom_argv[i], BOARD_TAG)) { 98 board = prom_argv[i] + strlen(BOARD_TAG); 99 100 if (match_tag(board, BOARD_RB532A)) 101 mips_machtype = MACH_MIKROTIK_RB532A; 102 else 103 mips_machtype = MACH_MIKROTIK_RB532; 104 } 105 106 strcpy(cp, prom_argv[i]); 107 cp += strlen(prom_argv[i]); 108 } 109 *(cp++) = ' '; 110 111 i = strlen(arcs_cmdline); 112 if (i > 0) { 113 *(cp++) = ' '; 114 strcpy(cp, arcs_cmdline); 115 cp += strlen(arcs_cmdline); 116 } 117 cmd_line[COMMAND_LINE_SIZE - 1] = '\0'; 118 119 strcpy(arcs_cmdline, cmd_line); 120 } 121 122 void __init prom_init(void) 123 { 124 struct ddr_ram __iomem *ddr; 125 phys_addr_t memsize; 126 phys_addr_t ddrbase; 127 128 ddr = ioremap_nocache(ddr_reg[0].start, 129 ddr_reg[0].end - ddr_reg[0].start); 130 131 if (!ddr) { 132 printk(KERN_ERR "Unable to remap DDR register\n"); 133 return; 134 } 135 136 ddrbase = (phys_addr_t)&ddr->ddrbase; 137 memsize = (phys_addr_t)&ddr->ddrmask; 138 memsize = 0 - memsize; 139 140 prom_setup_cmdline(); 141 142 /* give all RAM to boot allocator, 143 * except for the first 0x400 and the last 0x200 bytes */ 144 add_memory_region(ddrbase + 0x400, memsize - 0x600, BOOT_MEM_RAM); 145 } 146