| 1 | /* |
| 2 | * arch/ubicom32/kernel/setup.c |
| 3 | * Ubicom32 architecture-dependent parts of system setup. |
| 4 | * |
| 5 | * (C) Copyright 2009, Ubicom, Inc. |
| 6 | * Copyright (C) 1999-2007 Greg Ungerer (gerg@snapgear.com) |
| 7 | * Copyright (C) 1998,1999 D. Jeff Dionne <jeff@uClinux.org> |
| 8 | * Copyleft ()) 2000 James D. Schettine {james@telos-systems.com} |
| 9 | * Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com> |
| 10 | * Copyright (C) 1995 Hamish Macdonald |
| 11 | * Copyright (C) 2000 Lineo Inc. (www.lineo.com) |
| 12 | * Copyright (C) 2001 Lineo, Inc. <www.lineo.com> |
| 13 | * 68VZ328 Fixes/support Evan Stawnyczy <e@lineo.ca> |
| 14 | * |
| 15 | * This file is part of the Ubicom32 Linux Kernel Port. |
| 16 | * |
| 17 | * The Ubicom32 Linux Kernel Port is free software: you can redistribute |
| 18 | * it and/or modify it under the terms of the GNU General Public License |
| 19 | * as published by the Free Software Foundation, either version 2 of the |
| 20 | * License, or (at your option) any later version. |
| 21 | * |
| 22 | * The Ubicom32 Linux Kernel Port is distributed in the hope that it |
| 23 | * will be useful, but WITHOUT ANY WARRANTY; without even the implied |
| 24 | * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| 25 | * the GNU General Public License for more details. |
| 26 | * |
| 27 | * You should have received a copy of the GNU General Public License |
| 28 | * along with the Ubicom32 Linux Kernel Port. If not, |
| 29 | * see <http://www.gnu.org/licenses/>. |
| 30 | * |
| 31 | * Ubicom32 implementation derived from (with many thanks): |
| 32 | * arch/m68knommu |
| 33 | * arch/blackfin |
| 34 | * arch/parisc |
| 35 | */ |
| 36 | |
| 37 | #include <linux/kernel.h> |
| 38 | #include <linux/sched.h> |
| 39 | #include <linux/delay.h> |
| 40 | #include <linux/interrupt.h> |
| 41 | #include <linux/fb.h> |
| 42 | #include <linux/module.h> |
| 43 | #include <linux/console.h> |
| 44 | #include <linux/errno.h> |
| 45 | #include <linux/string.h> |
| 46 | #include <linux/bootmem.h> |
| 47 | #include <linux/seq_file.h> |
| 48 | #include <linux/init.h> |
| 49 | |
| 50 | #include <asm/devtree.h> |
| 51 | #include <asm/setup.h> |
| 52 | #include <asm/irq.h> |
| 53 | #include <asm/machdep.h> |
| 54 | #include <asm/pgtable.h> |
| 55 | #include <asm/pgalloc.h> |
| 56 | #include <asm/ubicom32-common.h> |
| 57 | #include <asm/processor.h> |
| 58 | #include <asm/bootargs.h> |
| 59 | #include <asm/thread.h> |
| 60 | |
| 61 | unsigned long memory_start; |
| 62 | EXPORT_SYMBOL(memory_start); |
| 63 | |
| 64 | unsigned long memory_end; |
| 65 | EXPORT_SYMBOL(memory_end); |
| 66 | |
| 67 | static char __initdata command_line[COMMAND_LINE_SIZE]; |
| 68 | #ifdef CONFIG_CMDLINE_BOOL |
| 69 | static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE; |
| 70 | #endif |
| 71 | |
| 72 | extern int _stext, _etext, _sdata, _edata, _sbss, _ebss, _end; |
| 73 | |
| 74 | /* |
| 75 | * setup_arch() |
| 76 | * Setup the architecture dependent portions of the system. |
| 77 | */ |
| 78 | void __init setup_arch(char **cmdline_p) |
| 79 | { |
| 80 | int bootmap_size; |
| 81 | unsigned long ram_start; |
| 82 | |
| 83 | processor_init(); |
| 84 | bootargs_init(); |
| 85 | |
| 86 | /* |
| 87 | * Use the link for memory_start from the link and the processor |
| 88 | * node for memory_end. |
| 89 | */ |
| 90 | memory_start = PAGE_ALIGN(((unsigned long)&_end)); |
| 91 | processor_dram(&ram_start, &memory_end); |
| 92 | |
| 93 | init_mm.start_code = (unsigned long) &_stext; |
| 94 | init_mm.end_code = (unsigned long) &_etext; |
| 95 | init_mm.end_data = (unsigned long) &_edata; |
| 96 | init_mm.brk = (unsigned long) 0; |
| 97 | |
| 98 | /* |
| 99 | * bootexec copies the original default command line to end of memory. |
| 100 | * u-boot can modify it there (i.e. to enable network boot) and the |
| 101 | * kernel picks up the modified version. |
| 102 | * |
| 103 | * mainexec creates a `new default' command_line which is in the |
| 104 | * bootargs devnode. It is updated on every firmware update but |
| 105 | * not used at the moment. |
| 106 | */ |
| 107 | strlcpy(boot_command_line, (char *)(memory_end - COMMAND_LINE_SIZE), COMMAND_LINE_SIZE); |
| 108 | |
| 109 | #ifdef CONFIG_CMDLINE_BOOL |
| 110 | #ifdef CONFIG_CMDLINE_OVERRIDE |
| 111 | strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); |
| 112 | #else |
| 113 | if (builtin_cmdline[0]) { |
| 114 | /* append boot loader cmdline to builtin */ |
| 115 | strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE); |
| 116 | strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE); |
| 117 | strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); |
| 118 | } |
| 119 | #endif |
| 120 | #endif |
| 121 | |
| 122 | strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE); |
| 123 | *cmdline_p = command_line; |
| 124 | |
| 125 | parse_early_param(); |
| 126 | |
| 127 | printk(KERN_INFO "%s Processor, Ubicom, Inc. <www.ubicom.com>\n", CPU); |
| 128 | |
| 129 | #if defined(DEBUG) |
| 130 | printk(KERN_DEBUG "KERNEL -> TEXT=0x%06x-0x%06x DATA=0x%06x-0x%06x " |
| 131 | "BSS=0x%06x-0x%06x\n", (int) &_stext, (int) &_etext, |
| 132 | (int) &_sdata, (int) &_edata, |
| 133 | (int) &_sbss, (int) &_ebss); |
| 134 | printk(KERN_DEBUG "MEMORY -> ROMFS=0x%06x-0x%06x MEM=0x%06x-0x%06x\n ", |
| 135 | (int) &_ebss, (int) memory_start, |
| 136 | (int) memory_start, (int) memory_end); |
| 137 | #endif |
| 138 | |
| 139 | #ifdef DEBUG |
| 140 | if (strlen(*cmdline_p)) |
| 141 | printk(KERN_DEBUG "Command line: '%s'\n", *cmdline_p); |
| 142 | #endif |
| 143 | |
| 144 | #if defined(CONFIG_FRAMEBUFFER_CONSOLE) && defined(CONFIG_DUMMY_CONSOLE) |
| 145 | conswitchp = &dummy_con; |
| 146 | #endif |
| 147 | |
| 148 | /* |
| 149 | * If we have a device tree, see if we have the nodes we need. |
| 150 | */ |
| 151 | if (devtree) { |
| 152 | devtree_print(); |
| 153 | } |
| 154 | |
| 155 | /* |
| 156 | * From the arm initialization comment: |
| 157 | * |
| 158 | * This doesn't seem to be used by the Linux memory manager any |
| 159 | * more, but is used by ll_rw_block. If we can get rid of it, we |
| 160 | * also get rid of some of the stuff above as well. |
| 161 | * |
| 162 | * Note: max_low_pfn and max_pfn reflect the number of _pages_ in |
| 163 | * the system, not the maximum PFN. |
| 164 | */ |
| 165 | max_pfn = max_low_pfn = (memory_end - PAGE_OFFSET) >> PAGE_SHIFT; |
| 166 | |
| 167 | /* |
| 168 | * Give all the memory to the bootmap allocator, tell it to put the |
| 169 | * boot mem_map at the start of memory. |
| 170 | */ |
| 171 | bootmap_size = init_bootmem_node( |
| 172 | NODE_DATA(0), |
| 173 | memory_start >> PAGE_SHIFT, /* map goes here */ |
| 174 | PAGE_OFFSET >> PAGE_SHIFT, /* 0 on coldfire */ |
| 175 | memory_end >> PAGE_SHIFT); |
| 176 | /* |
| 177 | * Free the usable memory, we have to make sure we do not free |
| 178 | * the bootmem bitmap so we then reserve it after freeing it :-) |
| 179 | */ |
| 180 | free_bootmem(memory_start, memory_end - memory_start); |
| 181 | reserve_bootmem(memory_start, bootmap_size, BOOTMEM_DEFAULT); |
| 182 | |
| 183 | /* |
| 184 | * Get kmalloc into gear. |
| 185 | */ |
| 186 | paging_init(); |
| 187 | |
| 188 | /* |
| 189 | * Fix up the thread_info structure, indicate this is a mainline Linux |
| 190 | * thread and setup the sw_ksp(). |
| 191 | */ |
| 192 | sw_ksp[thread_get_self()] = (unsigned int) current_thread_info(); |
| 193 | thread_set_mainline(thread_get_self()); |
| 194 | } |
| 195 | |
