GuanXuetao | 141c943 | 2011-01-15 18:15:45 +0800 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/unicore32/kernel/setup.c |
| 3 | * |
| 4 | * Code specific to PKUnity SoC and UniCore ISA |
| 5 | * |
| 6 | * Copyright (C) 2001-2010 GUAN Xue-tao |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License version 2 as |
| 10 | * published by the Free Software Foundation. |
| 11 | */ |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/stddef.h> |
| 15 | #include <linux/ioport.h> |
| 16 | #include <linux/delay.h> |
| 17 | #include <linux/utsname.h> |
| 18 | #include <linux/initrd.h> |
| 19 | #include <linux/console.h> |
| 20 | #include <linux/bootmem.h> |
| 21 | #include <linux/seq_file.h> |
| 22 | #include <linux/screen_info.h> |
| 23 | #include <linux/init.h> |
| 24 | #include <linux/root_dev.h> |
| 25 | #include <linux/cpu.h> |
| 26 | #include <linux/interrupt.h> |
| 27 | #include <linux/smp.h> |
| 28 | #include <linux/fs.h> |
| 29 | #include <linux/proc_fs.h> |
| 30 | #include <linux/memblock.h> |
| 31 | #include <linux/elf.h> |
| 32 | #include <linux/io.h> |
| 33 | |
| 34 | #include <asm/cputype.h> |
| 35 | #include <asm/sections.h> |
| 36 | #include <asm/setup.h> |
| 37 | #include <asm/cacheflush.h> |
| 38 | #include <asm/tlbflush.h> |
| 39 | #include <asm/traps.h> |
| 40 | |
| 41 | #include "setup.h" |
| 42 | |
| 43 | #ifndef MEM_SIZE |
| 44 | #define MEM_SIZE (16*1024*1024) |
| 45 | #endif |
| 46 | |
| 47 | struct stack { |
| 48 | u32 irq[3]; |
| 49 | u32 abt[3]; |
| 50 | u32 und[3]; |
| 51 | } ____cacheline_aligned; |
| 52 | |
| 53 | static struct stack stacks[NR_CPUS]; |
| 54 | |
| 55 | char elf_platform[ELF_PLATFORM_SIZE]; |
| 56 | EXPORT_SYMBOL(elf_platform); |
| 57 | |
| 58 | static char __initdata cmd_line[COMMAND_LINE_SIZE]; |
| 59 | |
| 60 | static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE; |
| 61 | |
| 62 | /* |
| 63 | * Standard memory resources |
| 64 | */ |
| 65 | static struct resource mem_res[] = { |
| 66 | { |
GuanXuetao | 141c943 | 2011-01-15 18:15:45 +0800 | [diff] [blame] | 67 | .name = "Kernel text", |
| 68 | .start = 0, |
| 69 | .end = 0, |
| 70 | .flags = IORESOURCE_MEM |
| 71 | }, |
| 72 | { |
| 73 | .name = "Kernel data", |
| 74 | .start = 0, |
| 75 | .end = 0, |
| 76 | .flags = IORESOURCE_MEM |
| 77 | } |
| 78 | }; |
| 79 | |
Guan Xuetao | 6b79474 | 2011-04-01 16:38:59 +0800 | [diff] [blame] | 80 | #define kernel_code mem_res[0] |
| 81 | #define kernel_data mem_res[1] |
GuanXuetao | 141c943 | 2011-01-15 18:15:45 +0800 | [diff] [blame] | 82 | |
| 83 | /* |
| 84 | * These functions re-use the assembly code in head.S, which |
| 85 | * already provide the required functionality. |
| 86 | */ |
| 87 | static void __init setup_processor(void) |
| 88 | { |
| 89 | printk(KERN_DEFAULT "CPU: UniCore-II [%08x] revision %d, cr=%08lx\n", |
| 90 | uc32_cpuid, (int)(uc32_cpuid >> 16) & 15, cr_alignment); |
| 91 | |
| 92 | sprintf(init_utsname()->machine, "puv3"); |
| 93 | sprintf(elf_platform, "ucv2"); |
| 94 | } |
| 95 | |
| 96 | /* |
| 97 | * cpu_init - initialise one CPU. |
| 98 | * |
| 99 | * cpu_init sets up the per-CPU stacks. |
| 100 | */ |
| 101 | void cpu_init(void) |
| 102 | { |
| 103 | unsigned int cpu = smp_processor_id(); |
| 104 | struct stack *stk = &stacks[cpu]; |
| 105 | |
| 106 | /* |
| 107 | * setup stacks for re-entrant exception handlers |
| 108 | */ |
| 109 | __asm__ ( |
| 110 | "mov.a asr, %1\n\t" |
| 111 | "add sp, %0, %2\n\t" |
| 112 | "mov.a asr, %3\n\t" |
| 113 | "add sp, %0, %4\n\t" |
| 114 | "mov.a asr, %5\n\t" |
| 115 | "add sp, %0, %6\n\t" |
| 116 | "mov.a asr, %7" |
| 117 | : |
| 118 | : "r" (stk), |
| 119 | "r" (PSR_R_BIT | PSR_I_BIT | INTR_MODE), |
| 120 | "I" (offsetof(struct stack, irq[0])), |
| 121 | "r" (PSR_R_BIT | PSR_I_BIT | ABRT_MODE), |
| 122 | "I" (offsetof(struct stack, abt[0])), |
| 123 | "r" (PSR_R_BIT | PSR_I_BIT | EXTN_MODE), |
| 124 | "I" (offsetof(struct stack, und[0])), |
| 125 | "r" (PSR_R_BIT | PSR_I_BIT | PRIV_MODE) |
| 126 | : "r30", "cc"); |
| 127 | } |
| 128 | |
| 129 | static int __init uc32_add_memory(unsigned long start, unsigned long size) |
| 130 | { |
| 131 | struct membank *bank = &meminfo.bank[meminfo.nr_banks]; |
| 132 | |
| 133 | if (meminfo.nr_banks >= NR_BANKS) { |
| 134 | printk(KERN_CRIT "NR_BANKS too low, " |
| 135 | "ignoring memory at %#lx\n", start); |
| 136 | return -EINVAL; |
| 137 | } |
| 138 | |
| 139 | /* |
| 140 | * Ensure that start/size are aligned to a page boundary. |
| 141 | * Size is appropriately rounded down, start is rounded up. |
| 142 | */ |
| 143 | size -= start & ~PAGE_MASK; |
| 144 | |
| 145 | bank->start = PAGE_ALIGN(start); |
| 146 | bank->size = size & PAGE_MASK; |
| 147 | |
| 148 | /* |
| 149 | * Check whether this memory region has non-zero size or |
| 150 | * invalid node number. |
| 151 | */ |
| 152 | if (bank->size == 0) |
| 153 | return -EINVAL; |
| 154 | |
| 155 | meminfo.nr_banks++; |
| 156 | return 0; |
| 157 | } |
| 158 | |
| 159 | /* |
| 160 | * Pick out the memory size. We look for mem=size@start, |
| 161 | * where start and size are "size[KkMm]" |
| 162 | */ |
| 163 | static int __init early_mem(char *p) |
| 164 | { |
| 165 | static int usermem __initdata = 1; |
| 166 | unsigned long size, start; |
| 167 | char *endp; |
| 168 | |
| 169 | /* |
| 170 | * If the user specifies memory size, we |
| 171 | * blow away any automatically generated |
| 172 | * size. |
| 173 | */ |
| 174 | if (usermem) { |
| 175 | usermem = 0; |
| 176 | meminfo.nr_banks = 0; |
| 177 | } |
| 178 | |
| 179 | start = PHYS_OFFSET; |
| 180 | size = memparse(p, &endp); |
| 181 | if (*endp == '@') |
| 182 | start = memparse(endp + 1, NULL); |
| 183 | |
| 184 | uc32_add_memory(start, size); |
| 185 | |
| 186 | return 0; |
| 187 | } |
| 188 | early_param("mem", early_mem); |
| 189 | |
| 190 | static void __init |
| 191 | request_standard_resources(struct meminfo *mi) |
| 192 | { |
| 193 | struct resource *res; |
| 194 | int i; |
| 195 | |
| 196 | kernel_code.start = virt_to_phys(_stext); |
| 197 | kernel_code.end = virt_to_phys(_etext - 1); |
| 198 | kernel_data.start = virt_to_phys(_sdata); |
| 199 | kernel_data.end = virt_to_phys(_end - 1); |
| 200 | |
| 201 | for (i = 0; i < mi->nr_banks; i++) { |
| 202 | if (mi->bank[i].size == 0) |
| 203 | continue; |
| 204 | |
| 205 | res = alloc_bootmem_low(sizeof(*res)); |
| 206 | res->name = "System RAM"; |
| 207 | res->start = mi->bank[i].start; |
| 208 | res->end = mi->bank[i].start + mi->bank[i].size - 1; |
| 209 | res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; |
| 210 | |
| 211 | request_resource(&iomem_resource, res); |
| 212 | |
| 213 | if (kernel_code.start >= res->start && |
| 214 | kernel_code.end <= res->end) |
| 215 | request_resource(res, &kernel_code); |
| 216 | if (kernel_data.start >= res->start && |
| 217 | kernel_data.end <= res->end) |
| 218 | request_resource(res, &kernel_data); |
| 219 | } |
GuanXuetao | 141c943 | 2011-01-15 18:15:45 +0800 | [diff] [blame] | 220 | } |
| 221 | |
| 222 | static void (*init_machine)(void) __initdata; |
| 223 | |
| 224 | static int __init customize_machine(void) |
| 225 | { |
| 226 | /* customizes platform devices, or adds new ones */ |
| 227 | if (init_machine) |
| 228 | init_machine(); |
| 229 | return 0; |
| 230 | } |
| 231 | arch_initcall(customize_machine); |
| 232 | |
| 233 | void __init setup_arch(char **cmdline_p) |
| 234 | { |
| 235 | char *from = default_command_line; |
| 236 | |
| 237 | setup_processor(); |
| 238 | |
| 239 | init_mm.start_code = (unsigned long) _stext; |
| 240 | init_mm.end_code = (unsigned long) _etext; |
| 241 | init_mm.end_data = (unsigned long) _edata; |
| 242 | init_mm.brk = (unsigned long) _end; |
| 243 | |
| 244 | /* parse_early_param needs a boot_command_line */ |
| 245 | strlcpy(boot_command_line, from, COMMAND_LINE_SIZE); |
| 246 | |
| 247 | /* populate cmd_line too for later use, preserving boot_command_line */ |
| 248 | strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE); |
| 249 | *cmdline_p = cmd_line; |
| 250 | |
| 251 | parse_early_param(); |
| 252 | |
| 253 | uc32_memblock_init(&meminfo); |
| 254 | |
| 255 | paging_init(); |
| 256 | request_standard_resources(&meminfo); |
| 257 | |
| 258 | cpu_init(); |
| 259 | |
| 260 | /* |
| 261 | * Set up various architecture-specific pointers |
| 262 | */ |
| 263 | init_machine = puv3_core_init; |
| 264 | |
| 265 | #ifdef CONFIG_VT |
| 266 | #if defined(CONFIG_VGA_CONSOLE) |
| 267 | conswitchp = &vga_con; |
| 268 | #elif defined(CONFIG_DUMMY_CONSOLE) |
| 269 | conswitchp = &dummy_con; |
| 270 | #endif |
| 271 | #endif |
| 272 | early_trap_init(); |
| 273 | } |
| 274 | |
| 275 | static struct cpu cpuinfo_unicore; |
| 276 | |
| 277 | static int __init topology_init(void) |
| 278 | { |
| 279 | int i; |
| 280 | |
| 281 | for_each_possible_cpu(i) |
| 282 | register_cpu(&cpuinfo_unicore, i); |
| 283 | |
| 284 | return 0; |
| 285 | } |
| 286 | subsys_initcall(topology_init); |
| 287 | |
| 288 | #ifdef CONFIG_HAVE_PROC_CPU |
| 289 | static int __init proc_cpu_init(void) |
| 290 | { |
| 291 | struct proc_dir_entry *res; |
| 292 | |
| 293 | res = proc_mkdir("cpu", NULL); |
| 294 | if (!res) |
| 295 | return -ENOMEM; |
| 296 | return 0; |
| 297 | } |
| 298 | fs_initcall(proc_cpu_init); |
| 299 | #endif |
| 300 | |
| 301 | static int c_show(struct seq_file *m, void *v) |
| 302 | { |
| 303 | seq_printf(m, "Processor\t: UniCore-II rev %d (%s)\n", |
| 304 | (int)(uc32_cpuid >> 16) & 15, elf_platform); |
| 305 | |
| 306 | seq_printf(m, "BogoMIPS\t: %lu.%02lu\n", |
| 307 | loops_per_jiffy / (500000/HZ), |
| 308 | (loops_per_jiffy / (5000/HZ)) % 100); |
| 309 | |
| 310 | /* dump out the processor features */ |
| 311 | seq_puts(m, "Features\t: CMOV UC-F64"); |
| 312 | |
| 313 | seq_printf(m, "\nCPU implementer\t: 0x%02x\n", uc32_cpuid >> 24); |
| 314 | seq_printf(m, "CPU architecture: 2\n"); |
| 315 | seq_printf(m, "CPU revision\t: %d\n", (uc32_cpuid >> 16) & 15); |
| 316 | |
| 317 | seq_printf(m, "Cache type\t: write-back\n" |
| 318 | "Cache clean\t: cp0 c5 ops\n" |
| 319 | "Cache lockdown\t: not support\n" |
| 320 | "Cache format\t: Harvard\n"); |
| 321 | |
| 322 | seq_puts(m, "\n"); |
| 323 | |
| 324 | seq_printf(m, "Hardware\t: PKUnity v3\n"); |
| 325 | |
| 326 | return 0; |
| 327 | } |
| 328 | |
| 329 | static void *c_start(struct seq_file *m, loff_t *pos) |
| 330 | { |
| 331 | return *pos < 1 ? (void *)1 : NULL; |
| 332 | } |
| 333 | |
| 334 | static void *c_next(struct seq_file *m, void *v, loff_t *pos) |
| 335 | { |
| 336 | ++*pos; |
| 337 | return NULL; |
| 338 | } |
| 339 | |
| 340 | static void c_stop(struct seq_file *m, void *v) |
| 341 | { |
| 342 | } |
| 343 | |
| 344 | const struct seq_operations cpuinfo_op = { |
| 345 | .start = c_start, |
| 346 | .next = c_next, |
| 347 | .stop = c_stop, |
| 348 | .show = c_show |
| 349 | }; |