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
  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         {
  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
  80 #define kernel_code mem_res[0]
  81 #define kernel_data mem_res[1]
  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         }
 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 };