arch/unicore32/kernel/setup.c

   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 #include <asm/memblock.h>
  41
  42 #include "setup.h"
  43
  44 #ifndef MEM_SIZE
  45 #define MEM_SIZE        (16*1024*1024)
  46 #endif
  47
  48 struct stack {
  49         u32 irq[3];
  50         u32 abt[3];
  51         u32 und[3];
  52 } ____cacheline_aligned;
  53
  54 static struct stack stacks[NR_CPUS];
  55
  56 #ifdef CONFIG_VGA_CONSOLE
  57 struct screen_info screen_info;
  58 #endif
  59
  60 char elf_platform[ELF_PLATFORM_SIZE];
  61 EXPORT_SYMBOL(elf_platform);
  62
  63 static char __initdata cmd_line[COMMAND_LINE_SIZE];
  64
  65 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
  66
  67 /*
  68  * Standard memory resources
  69  */
  70 static struct resource mem_res[] = {
  71         {
  72                 .name = "Kernel code",
  73                 .start = 0,
  74                 .end = 0,
  75                 .flags = IORESOURCE_SYSTEM_RAM
  76         },
  77         {
  78                 .name = "Kernel data",
  79                 .start = 0,
  80                 .end = 0,
  81                 .flags = IORESOURCE_SYSTEM_RAM
  82         }
  83 };
  84
  85 #define kernel_code mem_res[0]
  86 #define kernel_data mem_res[1]
  87
  88 /*
  89  * These functions re-use the assembly code in head.S, which
  90  * already provide the required functionality.
  91  */
  92 static void __init setup_processor(void)
  93 {
  94         printk(KERN_DEFAULT "CPU: UniCore-II [%08x] revision %d, cr=%08lx\n",
  95                uc32_cpuid, (int)(uc32_cpuid >> 16) & 15, cr_alignment);
  96
  97         sprintf(init_utsname()->machine, "puv3");
  98         sprintf(elf_platform, "ucv2");
  99 }
 100
 101 /*
 102  * cpu_init - initialise one CPU.
 103  *
 104  * cpu_init sets up the per-CPU stacks.
 105  */
 106 void cpu_init(void)
 107 {
 108         unsigned int cpu = smp_processor_id();
 109         struct stack *stk = &stacks[cpu];
 110
 111         /*
 112          * setup stacks for re-entrant exception handlers
 113          */
 114         __asm__ (
 115         "mov.a  asr, %1\n\t"
 116         "add    sp, %0, %2\n\t"
 117         "mov.a  asr, %3\n\t"
 118         "add    sp, %0, %4\n\t"
 119         "mov.a  asr, %5\n\t"
 120         "add    sp, %0, %6\n\t"
 121         "mov.a  asr, %7"
 122             :
 123             : "r" (stk),
 124               "r" (PSR_R_BIT | PSR_I_BIT | INTR_MODE),
 125               "I" (offsetof(struct stack, irq[0])),
 126               "r" (PSR_R_BIT | PSR_I_BIT | ABRT_MODE),
 127               "I" (offsetof(struct stack, abt[0])),
 128               "r" (PSR_R_BIT | PSR_I_BIT | EXTN_MODE),
 129               "I" (offsetof(struct stack, und[0])),
 130               "r" (PSR_R_BIT | PSR_I_BIT | PRIV_MODE)
 131         : "r30", "cc");
 132 }
 133
 134 static int __init uc32_add_memory(unsigned long start, unsigned long size)
 135 {
 136         struct membank *bank = &meminfo.bank[meminfo.nr_banks];
 137
 138         if (meminfo.nr_banks >= NR_BANKS) {
 139                 printk(KERN_CRIT "NR_BANKS too low, "
 140                         "ignoring memory at %#lx\n", start);
 141                 return -EINVAL;
 142         }
 143
 144         /*
 145          * Ensure that start/size are aligned to a page boundary.
 146          * Size is appropriately rounded down, start is rounded up.
 147          */
 148         size -= start & ~PAGE_MASK;
 149
 150         bank->start = PAGE_ALIGN(start);
 151         bank->size  = size & PAGE_MASK;
 152
 153         /*
 154          * Check whether this memory region has non-zero size or
 155          * invalid node number.
 156          */
 157         if (bank->size == 0)
 158                 return -EINVAL;
 159
 160         meminfo.nr_banks++;
 161         return 0;
 162 }
 163
 164 /*
 165  * Pick out the memory size.  We look for mem=size@start,
 166  * where start and size are "size[KkMm]"
 167  */
 168 static int __init early_mem(char *p)
 169 {
 170         static int usermem __initdata = 1;
 171         unsigned long size, start;
 172         char *endp;
 173
 174         /*
 175          * If the user specifies memory size, we
 176          * blow away any automatically generated
 177          * size.
 178          */
 179         if (usermem) {
 180                 usermem = 0;
 181                 meminfo.nr_banks = 0;
 182         }
 183
 184         start = PHYS_OFFSET;
 185         size  = memparse(p, &endp);
 186         if (*endp == '@')
 187                 start = memparse(endp + 1, NULL);
 188
 189         uc32_add_memory(start, size);
 190
 191         return 0;
 192 }
 193 early_param("mem", early_mem);
 194
 195 static void __init
 196 request_standard_resources(struct meminfo *mi)
 197 {
 198         struct resource *res;
 199         int i;
 200
 201         kernel_code.start   = virt_to_phys(_stext);
 202         kernel_code.end     = virt_to_phys(_etext - 1);
 203         kernel_data.start   = virt_to_phys(_sdata);
 204         kernel_data.end     = virt_to_phys(_end - 1);
 205
 206         for (i = 0; i < mi->nr_banks; i++) {
 207                 if (mi->bank[i].size == 0)
 208                         continue;
 209
 210                 res = alloc_bootmem_low(sizeof(*res));
 211                 res->name  = "System RAM";
 212                 res->start = mi->bank[i].start;
 213                 res->end   = mi->bank[i].start + mi->bank[i].size - 1;
 214                 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
 215
 216                 request_resource(&iomem_resource, res);
 217
 218                 if (kernel_code.start >= res->start &&
 219                     kernel_code.end <= res->end)
 220                         request_resource(res, &kernel_code);
 221                 if (kernel_data.start >= res->start &&
 222                     kernel_data.end <= res->end)
 223                         request_resource(res, &kernel_data);
 224         }
 225 }
 226
 227 static void (*init_machine)(void) __initdata;
 228
 229 static int __init customize_machine(void)
 230 {
 231         /* customizes platform devices, or adds new ones */
 232         if (init_machine)
 233                 init_machine();
 234         return 0;
 235 }
 236 arch_initcall(customize_machine);
 237
 238 void __init setup_arch(char **cmdline_p)
 239 {
 240         char *from = default_command_line;
 241
 242         setup_processor();
 243
 244         init_mm.start_code = (unsigned long) _stext;
 245         init_mm.end_code   = (unsigned long) _etext;
 246         init_mm.end_data   = (unsigned long) _edata;
 247         init_mm.brk        = (unsigned long) _end;
 248
 249         /* parse_early_param needs a boot_command_line */
 250         strlcpy(boot_command_line, from, COMMAND_LINE_SIZE);
 251
 252         /* populate cmd_line too for later use, preserving boot_command_line */
 253         strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
 254         *cmdline_p = cmd_line;
 255
 256         parse_early_param();
 257
 258         uc32_memblock_init(&meminfo);
 259
 260         paging_init();
 261         request_standard_resources(&meminfo);
 262
 263         cpu_init();
 264
 265         /*
 266          * Set up various architecture-specific pointers
 267          */
 268         init_machine = puv3_core_init;
 269
 270 #ifdef CONFIG_VT
 271 #if defined(CONFIG_VGA_CONSOLE)
 272         conswitchp = &vga_con;
 273 #elif defined(CONFIG_DUMMY_CONSOLE)
 274         conswitchp = &dummy_con;
 275 #endif
 276 #endif
 277         early_trap_init();
 278 }
 279
 280 static struct cpu cpuinfo_unicore;
 281
 282 static int __init topology_init(void)
 283 {
 284         int i;
 285
 286         for_each_possible_cpu(i)
 287                 register_cpu(&cpuinfo_unicore, i);
 288
 289         return 0;
 290 }
 291 subsys_initcall(topology_init);
 292
 293 #ifdef CONFIG_HAVE_PROC_CPU
 294 static int __init proc_cpu_init(void)
 295 {
 296         struct proc_dir_entry *res;
 297
 298         res = proc_mkdir("cpu", NULL);
 299         if (!res)
 300                 return -ENOMEM;
 301         return 0;
 302 }
 303 fs_initcall(proc_cpu_init);
 304 #endif
 305
 306 static int c_show(struct seq_file *m, void *v)
 307 {
 308         seq_printf(m, "Processor\t: UniCore-II rev %d (%s)\n",
 309                    (int)(uc32_cpuid >> 16) & 15, elf_platform);
 310
 311         seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
 312                    loops_per_jiffy / (500000/HZ),
 313                    (loops_per_jiffy / (5000/HZ)) % 100);
 314
 315         /* dump out the processor features */
 316         seq_puts(m, "Features\t: CMOV UC-F64");
 317
 318         seq_printf(m, "\nCPU implementer\t: 0x%02x\n", uc32_cpuid >> 24);
 319         seq_printf(m, "CPU architecture: 2\n");
 320         seq_printf(m, "CPU revision\t: %d\n", (uc32_cpuid >> 16) & 15);
 321
 322         seq_printf(m, "Cache type\t: write-back\n"
 323                         "Cache clean\t: cp0 c5 ops\n"
 324                         "Cache lockdown\t: not support\n"
 325                         "Cache format\t: Harvard\n");
 326
 327         seq_puts(m, "\n");
 328
 329         seq_printf(m, "Hardware\t: PKUnity v3\n");
 330
 331         return 0;
 332 }
 333
 334 static void *c_start(struct seq_file *m, loff_t *pos)
 335 {
 336         return *pos < 1 ? (void *)1 : NULL;
 337 }
 338
 339 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 340 {
 341         ++*pos;
 342         return NULL;
 343 }
 344
 345 static void c_stop(struct seq_file *m, void *v)
 346 {
 347 }
 348
 349 const struct seq_operations cpuinfo_op = {
 350         .start  = c_start,
 351         .next   = c_next,
 352         .stop   = c_stop,
 353         .show   = c_show
 354 };