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/module.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 extern void __init setup_serial_port(void); 41 42 unsigned int idt_cpu_freq = 132000000; 43 EXPORT_SYMBOL(idt_cpu_freq); 44 unsigned int gpio_bootup_state; 45 EXPORT_SYMBOL(gpio_bootup_state); 46 47 static struct resource ddr_reg[] = { 48 { 49 .name = "ddr-reg", 50 .start = DDR0_PHYS_ADDR, 51 .end = DDR0_PHYS_ADDR + sizeof(struct ddr_ram), 52 .flags = IORESOURCE_MEM, 53 } 54 }; 55 56 void __init prom_free_prom_memory(void) 57 { 58 /* No prom memory to free */ 59 } 60 61 static inline int match_tag(char *arg, const char *tag) 62 { 63 return strncmp(arg, tag, strlen(tag)) == 0; 64 } 65 66 static inline unsigned long tag2ul(char *arg, const char *tag) 67 { 68 char *num; 69 70 num = arg + strlen(tag); 71 return simple_strtoul(num, 0, 10); 72 } 73 74 void __init prom_setup_cmdline(void) 75 { 76 char cmd_line[CL_SIZE]; 77 char *cp, *board; 78 int prom_argc; 79 char **prom_argv, **prom_envp; 80 int i; 81 82 prom_argc = fw_arg0; 83 prom_argv = (char **) fw_arg1; 84 prom_envp = (char **) fw_arg2; 85 86 cp = cmd_line; 87 /* Note: it is common that parameters start 88 * at argv[1] and not argv[0], 89 * however, our elf loader starts at [0] */ 90 for (i = 0; i < prom_argc; i++) { 91 if (match_tag(prom_argv[i], FREQ_TAG)) { 92 idt_cpu_freq = tag2ul(prom_argv[i], FREQ_TAG); 93 continue; 94 } 95 #ifdef IGNORE_CMDLINE_MEM 96 /* parses out the "mem=xx" arg */ 97 if (match_tag(prom_argv[i], MEM_TAG)) 98 continue; 99 #endif 100 if (i > 0) 101 *(cp++) = ' '; 102 if (match_tag(prom_argv[i], BOARD_TAG)) { 103 board = prom_argv[i] + strlen(BOARD_TAG); 104 105 if (match_tag(board, BOARD_RB532A)) 106 mips_machtype = MACH_MIKROTIK_RB532A; 107 else 108 mips_machtype = MACH_MIKROTIK_RB532; 109 } 110 111 if (match_tag(prom_argv[i], GPIO_TAG)) 112 gpio_bootup_state = tag2ul(prom_argv[i], GPIO_TAG); 113 114 strcpy(cp, prom_argv[i]); 115 cp += strlen(prom_argv[i]); 116 } 117 *(cp++) = ' '; 118 119 i = strlen(arcs_cmdline); 120 if (i > 0) { 121 *(cp++) = ' '; 122 strcpy(cp, arcs_cmdline); 123 cp += strlen(arcs_cmdline); 124 } 125 if (gpio_bootup_state & 0x02) 126 strcpy(cp, GPIO_INIT_NOBUTTON); 127 else 128 strcpy(cp, GPIO_INIT_BUTTON); 129 130 cmd_line[CL_SIZE-1] = '\0'; 131 132 strcpy(arcs_cmdline, cmd_line); 133 } 134 135 void __init prom_init(void) 136 { 137 struct ddr_ram __iomem *ddr; 138 phys_t memsize; 139 phys_t ddrbase; 140 141 ddr = ioremap_nocache(ddr_reg[0].start, 142 ddr_reg[0].end - ddr_reg[0].start); 143 144 if (!ddr) { 145 printk(KERN_ERR "Unable to remap DDR register\n"); 146 return; 147 } 148 149 ddrbase = (phys_t)&ddr->ddrbase; 150 memsize = (phys_t)&ddr->ddrmask; 151 memsize = 0 - memsize; 152 153 prom_setup_cmdline(); 154 155 /* give all RAM to boot allocator, 156 * except for the first 0x400 and the last 0x200 bytes */ 157 add_memory_region(ddrbase + 0x400, memsize - 0x600, BOOT_MEM_RAM); 158 } 159