arch/mn10300/kernel/setup.c

   1 /* MN10300 Arch-specific initialisation
   2  *
   3  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public Licence
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the Licence, or (at your option) any later version.
  10  */
  11 #include <linux/errno.h>
  12 #include <linux/sched.h>
  13 #include <linux/kernel.h>
  14 #include <linux/mm.h>
  15 #include <linux/stddef.h>
  16 #include <linux/unistd.h>
  17 #include <linux/ptrace.h>
  18 #include <linux/user.h>
  19 #include <linux/tty.h>
  20 #include <linux/ioport.h>
  21 #include <linux/delay.h>
  22 #include <linux/init.h>
  23 #include <linux/bootmem.h>
  24 #include <linux/seq_file.h>
  25 #include <linux/cpu.h>
  26 #include <asm/processor.h>
  27 #include <linux/console.h>
  28 #include <asm/uaccess.h>
  29 #include <asm/setup.h>
  30 #include <asm/io.h>
  31 #include <asm/smp.h>
  32 #include <proc/proc.h>
  33 #include <asm/fpu.h>
  34 #include <asm/sections.h>
  35
  36 struct mn10300_cpuinfo boot_cpu_data;
  37
  38 /* For PCI or other memory-mapped resources */
  39 unsigned long pci_mem_start = 0x18000000;
  40
  41 char redboot_command_line[COMMAND_LINE_SIZE] =
  42         "console=ttyS0,115200 root=/dev/mtdblock3 rw";
  43
  44 char __initdata redboot_platform_name[COMMAND_LINE_SIZE];
  45
  46 static struct resource code_resource = {
  47         .start  = 0x100000,
  48         .end    = 0,
  49         .name   = "Kernel code",
  50 };
  51
  52 static struct resource data_resource = {
  53         .start  = 0,
  54         .end    = 0,
  55         .name   = "Kernel data",
  56 };
  57
  58 static unsigned long __initdata phys_memory_base;
  59 static unsigned long __initdata phys_memory_end;
  60 static unsigned long __initdata memory_end;
  61 unsigned long memory_size;
  62
  63 struct thread_info *__current_ti = &init_thread_union.thread_info;
  64 struct task_struct *__current = &init_task;
  65
  66 #define mn10300_known_cpus 5
  67 static const char *const mn10300_cputypes[] = {
  68         "am33-1",
  69         "am33-2",
  70         "am34-1",
  71         "am33-3",
  72         "am34-2",
  73         "unknown"
  74 };
  75
  76 /*
  77  *
  78  */
  79 static void __init parse_mem_cmdline(char **cmdline_p)
  80 {
  81         char *from, *to, c;
  82
  83         /* save unparsed command line copy for /proc/cmdline */
  84         strcpy(boot_command_line, redboot_command_line);
  85
  86         /* see if there's an explicit memory size option */
  87         from = redboot_command_line;
  88         to = redboot_command_line;
  89         c = ' ';
  90
  91         for (;;) {
  92                 if (c == ' ' && !memcmp(from, "mem=", 4)) {
  93                         if (to != redboot_command_line)
  94                                 to--;
  95                         memory_size = memparse(from + 4, &from);
  96                 }
  97
  98                 c = *(from++);
  99                 if (!c)
 100                         break;
 101
 102                 *(to++) = c;
 103         }
 104
 105         *to = '\0';
 106         *cmdline_p = redboot_command_line;
 107
 108         if (memory_size == 0)
 109                 panic("Memory size not known\n");
 110
 111         memory_end = (unsigned long) CONFIG_KERNEL_RAM_BASE_ADDRESS +
 112                 memory_size;
 113         if (memory_end > phys_memory_end)
 114                 memory_end = phys_memory_end;
 115 }
 116
 117 /*
 118  * architecture specific setup
 119  */
 120 void __init setup_arch(char **cmdline_p)
 121 {
 122         unsigned long bootmap_size;
 123         unsigned long kstart_pfn, start_pfn, free_pfn, end_pfn;
 124
 125         cpu_init();
 126         unit_setup();
 127         smp_init_cpus();
 128         parse_mem_cmdline(cmdline_p);
 129
 130         init_mm.start_code = (unsigned long)&_text;
 131         init_mm.end_code = (unsigned long) &_etext;
 132         init_mm.end_data = (unsigned long) &_edata;
 133         init_mm.brk = (unsigned long) &_end;
 134
 135         code_resource.start = virt_to_bus(&_text);
 136         code_resource.end = virt_to_bus(&_etext)-1;
 137         data_resource.start = virt_to_bus(&_etext);
 138         data_resource.end = virt_to_bus(&_edata)-1;
 139
 140         start_pfn = (CONFIG_KERNEL_RAM_BASE_ADDRESS >> PAGE_SHIFT);
 141         kstart_pfn = PFN_UP(__pa(&_text));
 142         free_pfn = PFN_UP(__pa(&_end));
 143         end_pfn = PFN_DOWN(__pa(memory_end));
 144
 145         bootmap_size = init_bootmem_node(&contig_page_data,
 146                                          free_pfn,
 147                                          start_pfn,
 148                                          end_pfn);
 149
 150         if (kstart_pfn > start_pfn)
 151                 free_bootmem(PFN_PHYS(start_pfn),
 152                              PFN_PHYS(kstart_pfn - start_pfn));
 153
 154         free_bootmem(PFN_PHYS(free_pfn),
 155                      PFN_PHYS(end_pfn - free_pfn));
 156
 157         /* If interrupt vector table is in main ram, then we need to
 158            reserve the page it is occupying. */
 159         if (CONFIG_INTERRUPT_VECTOR_BASE >= CONFIG_KERNEL_RAM_BASE_ADDRESS &&
 160             CONFIG_INTERRUPT_VECTOR_BASE < memory_end)
 161                 reserve_bootmem(CONFIG_INTERRUPT_VECTOR_BASE, PAGE_SIZE,
 162                                 BOOTMEM_DEFAULT);
 163
 164         reserve_bootmem(PAGE_ALIGN(PFN_PHYS(free_pfn)), bootmap_size,
 165                         BOOTMEM_DEFAULT);
 166
 167 #ifdef CONFIG_VT
 168 #if defined(CONFIG_VGA_CONSOLE)
 169         conswitchp = &vga_con;
 170 #elif defined(CONFIG_DUMMY_CONSOLE)
 171         conswitchp = &dummy_con;
 172 #endif
 173 #endif
 174
 175         paging_init();
 176 }
 177
 178 /*
 179  * perform CPU initialisation
 180  */
 181 void __init cpu_init(void)
 182 {
 183         unsigned long cpurev = CPUREV, type;
 184
 185         type = (CPUREV & CPUREV_TYPE) >> CPUREV_TYPE_S;
 186         if (type > mn10300_known_cpus)
 187                 type = mn10300_known_cpus;
 188
 189         printk(KERN_INFO "Panasonic %s, rev %ld\n",
 190                mn10300_cputypes[type],
 191                (cpurev & CPUREV_REVISION) >> CPUREV_REVISION_S);
 192
 193         get_mem_info(&phys_memory_base, &memory_size);
 194         phys_memory_end = phys_memory_base + memory_size;
 195
 196         fpu_init_state();
 197 }
 198
 199 static struct cpu cpu_devices[NR_CPUS];
 200
 201 static int __init topology_init(void)
 202 {
 203         int i;
 204
 205         for_each_present_cpu(i)
 206                 register_cpu(&cpu_devices[i], i);
 207
 208         return 0;
 209 }
 210
 211 subsys_initcall(topology_init);
 212
 213 /*
 214  * Get CPU information for use by the procfs.
 215  */
 216 static int show_cpuinfo(struct seq_file *m, void *v)
 217 {
 218 #ifdef CONFIG_SMP
 219         struct mn10300_cpuinfo *c = v;
 220         unsigned long cpu_id = c - cpu_data;
 221         unsigned long cpurev = c->type, type, icachesz, dcachesz;
 222 #else  /* CONFIG_SMP */
 223         unsigned long cpu_id = 0;
 224         unsigned long cpurev = CPUREV, type, icachesz, dcachesz;
 225 #endif /* CONFIG_SMP */
 226
 227 #ifdef CONFIG_SMP
 228         if (!cpu_online(cpu_id))
 229                 return 0;
 230 #endif
 231
 232         type = (cpurev & CPUREV_TYPE) >> CPUREV_TYPE_S;
 233         if (type > mn10300_known_cpus)
 234                 type = mn10300_known_cpus;
 235
 236         icachesz =
 237                 ((cpurev & CPUREV_ICWAY ) >> CPUREV_ICWAY_S)  *
 238                 ((cpurev & CPUREV_ICSIZE) >> CPUREV_ICSIZE_S) *
 239                 1024;
 240
 241         dcachesz =
 242                 ((cpurev & CPUREV_DCWAY ) >> CPUREV_DCWAY_S)  *
 243                 ((cpurev & CPUREV_DCSIZE) >> CPUREV_DCSIZE_S) *
 244                 1024;
 245
 246         seq_printf(m,
 247                    "processor  : %ld\n"
 248                    "vendor_id  : " PROCESSOR_VENDOR_NAME "\n"
 249                    "cpu core   : %s\n"
 250                    "cpu rev    : %lu\n"
 251                    "model name : " PROCESSOR_MODEL_NAME         "\n"
 252                    "icache size: %lu\n"
 253                    "dcache size: %lu\n",
 254                    cpu_id,
 255                    mn10300_cputypes[type],
 256                    (cpurev & CPUREV_REVISION) >> CPUREV_REVISION_S,
 257                    icachesz,
 258                    dcachesz
 259                    );
 260
 261         seq_printf(m,
 262                    "ioclk speed: %lu.%02luMHz\n"
 263                    "bogomips   : %lu.%02lu\n\n",
 264                    MN10300_IOCLK / 1000000,
 265                    (MN10300_IOCLK / 10000) % 100,
 266 #ifdef CONFIG_SMP
 267                    c->loops_per_jiffy / (500000 / HZ),
 268                    (c->loops_per_jiffy / (5000 / HZ)) % 100
 269 #else  /* CONFIG_SMP */
 270                    loops_per_jiffy / (500000 / HZ),
 271                    (loops_per_jiffy / (5000 / HZ)) % 100
 272 #endif /* CONFIG_SMP */
 273                    );
 274
 275         return 0;
 276 }
 277
 278 static void *c_start(struct seq_file *m, loff_t *pos)
 279 {
 280         return *pos < NR_CPUS ? cpu_data + *pos : NULL;
 281 }
 282
 283 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 284 {
 285         ++*pos;
 286         return c_start(m, pos);
 287 }
 288
 289 static void c_stop(struct seq_file *m, void *v)
 290 {
 291 }
 292
 293 const struct seq_operations cpuinfo_op = {
 294         .start  = c_start,
 295         .next   = c_next,
 296         .stop   = c_stop,
 297         .show   = show_cpuinfo,
 298 };