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 static char __initdata cmd_line[COMMAND_LINE_SIZE];
  42 char redboot_command_line[COMMAND_LINE_SIZE] =
  43         "console=ttyS0,115200 root=/dev/mtdblock3 rw";
  44
  45 char __initdata redboot_platform_name[COMMAND_LINE_SIZE];
  46
  47 static struct resource code_resource = {
  48         .start  = 0x100000,
  49         .end    = 0,
  50         .name   = "Kernel code",
  51 };
  52
  53 static struct resource data_resource = {
  54         .start  = 0,
  55         .end    = 0,
  56         .name   = "Kernel data",
  57 };
  58
  59 static unsigned long __initdata phys_memory_base;
  60 static unsigned long __initdata phys_memory_end;
  61 static unsigned long __initdata memory_end;
  62 unsigned long memory_size;
  63
  64 struct thread_info *__current_ti = &init_thread_union.thread_info;
  65 struct task_struct *__current = &init_task;
  66
  67 #define mn10300_known_cpus 5
  68 static const char *const mn10300_cputypes[] = {
  69         "am33-1",
  70         "am33-2",
  71         "am34-1",
  72         "am33-3",
  73         "am34-2",
  74         "unknown"
  75 };
  76
  77 /*
  78  * Pick out the memory size.  We look for mem=size,
  79  * where size is "size[KkMm]"
  80  */
  81 static int __init early_mem(char *p)
  82 {
  83         memory_size = memparse(p, &p);
  84
  85         if (memory_size == 0)
  86                 panic("Memory size not known\n");
  87
  88         return 0;
  89 }
  90 early_param("mem", early_mem);
  91
  92 /*
  93  * architecture specific setup
  94  */
  95 void __init setup_arch(char **cmdline_p)
  96 {
  97         unsigned long bootmap_size;
  98         unsigned long kstart_pfn, start_pfn, free_pfn, end_pfn;
  99
 100         cpu_init();
 101         unit_setup();
 102         smp_init_cpus();
 103
 104         /* save unparsed command line copy for /proc/cmdline */
 105         strlcpy(boot_command_line, redboot_command_line, COMMAND_LINE_SIZE);
 106
 107         /* populate cmd_line too for later use, preserving boot_command_line */
 108         strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
 109         *cmdline_p = cmd_line;
 110
 111         parse_early_param();
 112
 113         memory_end = (unsigned long) CONFIG_KERNEL_RAM_BASE_ADDRESS +
 114                 memory_size;
 115         if (memory_end > phys_memory_end)
 116                 memory_end = phys_memory_end;
 117
 118         init_mm.start_code = (unsigned long)&_text;
 119         init_mm.end_code = (unsigned long) &_etext;
 120         init_mm.end_data = (unsigned long) &_edata;
 121         init_mm.brk = (unsigned long) &_end;
 122
 123         code_resource.start = virt_to_bus(&_text);
 124         code_resource.end = virt_to_bus(&_etext)-1;
 125         data_resource.start = virt_to_bus(&_etext);
 126         data_resource.end = virt_to_bus(&_edata)-1;
 127
 128         start_pfn = (CONFIG_KERNEL_RAM_BASE_ADDRESS >> PAGE_SHIFT);
 129         kstart_pfn = PFN_UP(__pa(&_text));
 130         free_pfn = PFN_UP(__pa(&_end));
 131         end_pfn = PFN_DOWN(__pa(memory_end));
 132
 133         bootmap_size = init_bootmem_node(&contig_page_data,
 134                                          free_pfn,
 135                                          start_pfn,
 136                                          end_pfn);
 137
 138         if (kstart_pfn > start_pfn)
 139                 free_bootmem(PFN_PHYS(start_pfn),
 140                              PFN_PHYS(kstart_pfn - start_pfn));
 141
 142         free_bootmem(PFN_PHYS(free_pfn),
 143                      PFN_PHYS(end_pfn - free_pfn));
 144
 145         /* If interrupt vector table is in main ram, then we need to
 146            reserve the page it is occupying. */
 147         if (CONFIG_INTERRUPT_VECTOR_BASE >= CONFIG_KERNEL_RAM_BASE_ADDRESS &&
 148             CONFIG_INTERRUPT_VECTOR_BASE < memory_end)
 149                 reserve_bootmem(CONFIG_INTERRUPT_VECTOR_BASE, PAGE_SIZE,
 150                                 BOOTMEM_DEFAULT);
 151
 152         reserve_bootmem(PAGE_ALIGN(PFN_PHYS(free_pfn)), bootmap_size,
 153                         BOOTMEM_DEFAULT);
 154
 155 #ifdef CONFIG_VT
 156 #if defined(CONFIG_VGA_CONSOLE)
 157         conswitchp = &vga_con;
 158 #elif defined(CONFIG_DUMMY_CONSOLE)
 159         conswitchp = &dummy_con;
 160 #endif
 161 #endif
 162
 163         paging_init();
 164 }
 165
 166 /*
 167  * perform CPU initialisation
 168  */
 169 void __init cpu_init(void)
 170 {
 171         unsigned long cpurev = CPUREV, type;
 172
 173         type = (CPUREV & CPUREV_TYPE) >> CPUREV_TYPE_S;
 174         if (type > mn10300_known_cpus)
 175                 type = mn10300_known_cpus;
 176
 177         printk(KERN_INFO "Panasonic %s, rev %ld\n",
 178                mn10300_cputypes[type],
 179                (cpurev & CPUREV_REVISION) >> CPUREV_REVISION_S);
 180
 181         get_mem_info(&phys_memory_base, &memory_size);
 182         phys_memory_end = phys_memory_base + memory_size;
 183
 184         fpu_init_state();
 185 }
 186
 187 static struct cpu cpu_devices[NR_CPUS];
 188
 189 static int __init topology_init(void)
 190 {
 191         int i;
 192
 193         for_each_present_cpu(i)
 194                 register_cpu(&cpu_devices[i], i);
 195
 196         return 0;
 197 }
 198
 199 subsys_initcall(topology_init);
 200
 201 /*
 202  * Get CPU information for use by the procfs.
 203  */
 204 static int show_cpuinfo(struct seq_file *m, void *v)
 205 {
 206 #ifdef CONFIG_SMP
 207         struct mn10300_cpuinfo *c = v;
 208         unsigned long cpu_id = c - cpu_data;
 209         unsigned long cpurev = c->type, type, icachesz, dcachesz;
 210 #else  /* CONFIG_SMP */
 211         unsigned long cpu_id = 0;
 212         unsigned long cpurev = CPUREV, type, icachesz, dcachesz;
 213 #endif /* CONFIG_SMP */
 214
 215 #ifdef CONFIG_SMP
 216         if (!cpu_online(cpu_id))
 217                 return 0;
 218 #endif
 219
 220         type = (cpurev & CPUREV_TYPE) >> CPUREV_TYPE_S;
 221         if (type > mn10300_known_cpus)
 222                 type = mn10300_known_cpus;
 223
 224         icachesz =
 225                 ((cpurev & CPUREV_ICWAY ) >> CPUREV_ICWAY_S)  *
 226                 ((cpurev & CPUREV_ICSIZE) >> CPUREV_ICSIZE_S) *
 227                 1024;
 228
 229         dcachesz =
 230                 ((cpurev & CPUREV_DCWAY ) >> CPUREV_DCWAY_S)  *
 231                 ((cpurev & CPUREV_DCSIZE) >> CPUREV_DCSIZE_S) *
 232                 1024;
 233
 234         seq_printf(m,
 235                    "processor  : %ld\n"
 236                    "vendor_id  : " PROCESSOR_VENDOR_NAME "\n"
 237                    "cpu core   : %s\n"
 238                    "cpu rev    : %lu\n"
 239                    "model name : " PROCESSOR_MODEL_NAME         "\n"
 240                    "icache size: %lu\n"
 241                    "dcache size: %lu\n",
 242                    cpu_id,
 243                    mn10300_cputypes[type],
 244                    (cpurev & CPUREV_REVISION) >> CPUREV_REVISION_S,
 245                    icachesz,
 246                    dcachesz
 247                    );
 248
 249         seq_printf(m,
 250                    "ioclk speed: %lu.%02luMHz\n"
 251                    "bogomips   : %lu.%02lu\n\n",
 252                    MN10300_IOCLK / 1000000,
 253                    (MN10300_IOCLK / 10000) % 100,
 254 #ifdef CONFIG_SMP
 255                    c->loops_per_jiffy / (500000 / HZ),
 256                    (c->loops_per_jiffy / (5000 / HZ)) % 100
 257 #else  /* CONFIG_SMP */
 258                    loops_per_jiffy / (500000 / HZ),
 259                    (loops_per_jiffy / (5000 / HZ)) % 100
 260 #endif /* CONFIG_SMP */
 261                    );
 262
 263         return 0;
 264 }
 265
 266 static void *c_start(struct seq_file *m, loff_t *pos)
 267 {
 268         return *pos < NR_CPUS ? cpu_data + *pos : NULL;
 269 }
 270
 271 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 272 {
 273         ++*pos;
 274         return c_start(m, pos);
 275 }
 276
 277 static void c_stop(struct seq_file *m, void *v)
 278 {
 279 }
 280
 281 const struct seq_operations cpuinfo_op = {
 282         .start  = c_start,
 283         .next   = c_next,
 284         .stop   = c_stop,
 285         .show   = show_cpuinfo,
 286 };