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/slab.h>
  19 #include <linux/user.h>
  20 #include <linux/tty.h>
  21 #include <linux/ioport.h>
  22 #include <linux/delay.h>
  23 #include <linux/init.h>
  24 #include <linux/bootmem.h>
  25 #include <linux/seq_file.h>
  26 #include <asm/processor.h>
  27 #include <linux/console.h>
  28 #include <asm/uaccess.h>
  29 #include <asm/system.h>
  30 #include <asm/setup.h>
  31 #include <asm/io.h>
  32 #include <asm/smp.h>
  33 #include <asm/proc/proc.h>
  34 #include <asm/busctl-regs.h>
  35 #include <asm/fpu.h>
  36 #include <asm/sections.h>
  37
  38 struct mn10300_cpuinfo boot_cpu_data;
  39
  40 /* For PCI or other memory-mapped resources */
  41 unsigned long pci_mem_start = 0x18000000;
  42
  43 char redboot_command_line[COMMAND_LINE_SIZE] =
  44         "console=ttyS0,115200 root=/dev/mtdblock3 rw";
  45
  46 char __initdata redboot_platform_name[COMMAND_LINE_SIZE];
  47
  48 static struct resource code_resource = {
  49         .start  = 0x100000,
  50         .end    = 0,
  51         .name   = "Kernel code",
  52 };
  53
  54 static struct resource data_resource = {
  55         .start  = 0,
  56         .end    = 0,
  57         .name   = "Kernel data",
  58 };
  59
  60 static unsigned long __initdata phys_memory_base;
  61 static unsigned long __initdata phys_memory_end;
  62 static unsigned long __initdata memory_end;
  63 unsigned long memory_size;
  64
  65 struct thread_info *__current_ti = &init_thread_union.thread_info;
  66 struct task_struct *__current = &init_task;
  67
  68 #define mn10300_known_cpus 3
  69 static const char *const mn10300_cputypes[] = {
  70         "am33v1",
  71         "am33v2",
  72         "am34v1",
  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         parse_mem_cmdline(cmdline_p);
 128
 129         init_mm.start_code = (unsigned long)&_text;
 130         init_mm.end_code = (unsigned long) &_etext;
 131         init_mm.end_data = (unsigned long) &_edata;
 132         init_mm.brk = (unsigned long) &_end;
 133
 134         code_resource.start = virt_to_bus(&_text);
 135         code_resource.end = virt_to_bus(&_etext)-1;
 136         data_resource.start = virt_to_bus(&_etext);
 137         data_resource.end = virt_to_bus(&_edata)-1;
 138
 139 #define PFN_UP(x)       (((x) + PAGE_SIZE-1) >> PAGE_SHIFT)
 140 #define PFN_DOWN(x)     ((x) >> PAGE_SHIFT)
 141 #define PFN_PHYS(x)     ((x) << PAGE_SHIFT)
 142
 143         start_pfn = (CONFIG_KERNEL_RAM_BASE_ADDRESS >> PAGE_SHIFT);
 144         kstart_pfn = PFN_UP(__pa(&_text));
 145         free_pfn = PFN_UP(__pa(&_end));
 146         end_pfn = PFN_DOWN(__pa(memory_end));
 147
 148         bootmap_size = init_bootmem_node(&contig_page_data,
 149                                          free_pfn,
 150                                          start_pfn,
 151                                          end_pfn);
 152
 153         if (kstart_pfn > start_pfn)
 154                 free_bootmem(PFN_PHYS(start_pfn),
 155                              PFN_PHYS(kstart_pfn - start_pfn));
 156
 157         free_bootmem(PFN_PHYS(free_pfn),
 158                      PFN_PHYS(end_pfn - free_pfn));
 159
 160         /* If interrupt vector table is in main ram, then we need to
 161            reserve the page it is occupying. */
 162         if (CONFIG_INTERRUPT_VECTOR_BASE >= CONFIG_KERNEL_RAM_BASE_ADDRESS &&
 163             CONFIG_INTERRUPT_VECTOR_BASE < memory_end)
 164                 reserve_bootmem(CONFIG_INTERRUPT_VECTOR_BASE, PAGE_SIZE,
 165                                 BOOTMEM_DEFAULT);
 166
 167         reserve_bootmem(PAGE_ALIGN(PFN_PHYS(free_pfn)), bootmap_size,
 168                         BOOTMEM_DEFAULT);
 169
 170 #ifdef CONFIG_VT
 171 #if defined(CONFIG_VGA_CONSOLE)
 172         conswitchp = &vga_con;
 173 #elif defined(CONFIG_DUMMY_CONSOLE)
 174         conswitchp = &dummy_con;
 175 #endif
 176 #endif
 177
 178         paging_init();
 179 }
 180
 181 /*
 182  * perform CPU initialisation
 183  */
 184 void __init cpu_init(void)
 185 {
 186         unsigned long cpurev = CPUREV, type;
 187         unsigned long base, size;
 188
 189         type = (CPUREV & CPUREV_TYPE) >> CPUREV_TYPE_S;
 190         if (type > mn10300_known_cpus)
 191                 type = mn10300_known_cpus;
 192
 193         printk(KERN_INFO "Matsushita %s, rev %ld\n",
 194                mn10300_cputypes[type],
 195                (cpurev & CPUREV_REVISION) >> CPUREV_REVISION_S);
 196
 197         /* determine the memory size and base from the memory controller regs */
 198         memory_size = 0;
 199
 200         base = SDBASE(0);
 201         if (base & SDBASE_CE) {
 202                 size = (base & SDBASE_CBAM) << SDBASE_CBAM_SHIFT;
 203                 size = ~size + 1;
 204                 base &= SDBASE_CBA;
 205
 206                 printk(KERN_INFO "SDRAM[0]: %luMb @%08lx\n", size >> 20, base);
 207                 memory_size += size;
 208                 phys_memory_base = base;
 209         }
 210
 211         base = SDBASE(1);
 212         if (base & SDBASE_CE) {
 213                 size = (base & SDBASE_CBAM) << SDBASE_CBAM_SHIFT;
 214                 size = ~size + 1;
 215                 base &= SDBASE_CBA;
 216
 217                 printk(KERN_INFO "SDRAM[1]: %luMb @%08lx\n", size >> 20, base);
 218                 memory_size += size;
 219                 if (phys_memory_base == 0)
 220                         phys_memory_base = base;
 221         }
 222
 223         phys_memory_end = phys_memory_base + memory_size;
 224
 225 #ifdef CONFIG_FPU
 226         fpu_init_state();
 227 #endif
 228 }
 229
 230 /*
 231  * Get CPU information for use by the procfs.
 232  */
 233 static int show_cpuinfo(struct seq_file *m, void *v)
 234 {
 235         unsigned long cpurev = CPUREV, type, icachesz, dcachesz;
 236
 237         type = (CPUREV & CPUREV_TYPE) >> CPUREV_TYPE_S;
 238         if (type > mn10300_known_cpus)
 239                 type = mn10300_known_cpus;
 240
 241         icachesz =
 242                 ((cpurev & CPUREV_ICWAY ) >> CPUREV_ICWAY_S)  *
 243                 ((cpurev & CPUREV_ICSIZE) >> CPUREV_ICSIZE_S) *
 244                 1024;
 245
 246         dcachesz =
 247                 ((cpurev & CPUREV_DCWAY ) >> CPUREV_DCWAY_S)  *
 248                 ((cpurev & CPUREV_DCSIZE) >> CPUREV_DCSIZE_S) *
 249                 1024;
 250
 251         seq_printf(m,
 252                    "processor  : 0\n"
 253                    "vendor_id  : Matsushita\n"
 254                    "cpu core   : %s\n"
 255                    "cpu rev    : %lu\n"
 256                    "model name : " PROCESSOR_MODEL_NAME         "\n"
 257                    "icache size: %lu\n"
 258                    "dcache size: %lu\n",
 259                    mn10300_cputypes[type],
 260                    (cpurev & CPUREV_REVISION) >> CPUREV_REVISION_S,
 261                    icachesz,
 262                    dcachesz
 263                    );
 264
 265         seq_printf(m,
 266                    "ioclk speed: %lu.%02luMHz\n"
 267                    "bogomips   : %lu.%02lu\n\n",
 268                    MN10300_IOCLK / 1000000,
 269                    (MN10300_IOCLK / 10000) % 100,
 270                    loops_per_jiffy / (500000 / HZ),
 271                    (loops_per_jiffy / (5000 / HZ)) % 100
 272                    );
 273
 274         return 0;
 275 }
 276
 277 static void *c_start(struct seq_file *m, loff_t *pos)
 278 {
 279         return *pos < NR_CPUS ? cpu_data + *pos : NULL;
 280 }
 281
 282 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 283 {
 284         ++*pos;
 285         return c_start(m, pos);
 286 }
 287
 288 static void c_stop(struct seq_file *m, void *v)
 289 {
 290 }
 291
 292 struct seq_operations cpuinfo_op = {
 293         .start  = c_start,
 294         .next   = c_next,
 295         .stop   = c_stop,
 296         .show   = show_cpuinfo,
 297 };