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 <asm/processor.h>
  26 #include <linux/console.h>
  27 #include <asm/uaccess.h>
  28 #include <asm/system.h>
  29 #include <asm/setup.h>
  30 #include <asm/io.h>
  31 #include <asm/smp.h>
  32 #include <proc/proc.h>
  33 #include <asm/busctl-regs.h>
  34 #include <asm/fpu.h>
  35 #include <asm/sections.h>
  36
  37 struct mn10300_cpuinfo boot_cpu_data;
  38
  39 /* For PCI or other memory-mapped resources */
  40 unsigned long pci_mem_start = 0x18000000;
  41
  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 3
  68 static const char *const mn10300_cputypes[] = {
  69         "am33v1",
  70         "am33v2",
  71         "am34v1",
  72         "unknown"
  73 };
  74
  75 /*
  76  *
  77  */
  78 static void __init parse_mem_cmdline(char **cmdline_p)
  79 {
  80         char *from, *to, c;
  81
  82         /* save unparsed command line copy for /proc/cmdline */
  83         strcpy(boot_command_line, redboot_command_line);
  84
  85         /* see if there's an explicit memory size option */
  86         from = redboot_command_line;
  87         to = redboot_command_line;
  88         c = ' ';
  89
  90         for (;;) {
  91                 if (c == ' ' && !memcmp(from, "mem=", 4)) {
  92                         if (to != redboot_command_line)
  93                                 to--;
  94                         memory_size = memparse(from + 4, &from);
  95                 }
  96
  97                 c = *(from++);
  98                 if (!c)
  99                         break;
 100
 101                 *(to++) = c;
 102         }
 103
 104         *to = '\0';
 105         *cmdline_p = redboot_command_line;
 106
 107         if (memory_size == 0)
 108                 panic("Memory size not known\n");
 109
 110         memory_end = (unsigned long) CONFIG_KERNEL_RAM_BASE_ADDRESS +
 111                 memory_size;
 112         if (memory_end > phys_memory_end)
 113                 memory_end = phys_memory_end;
 114 }
 115
 116 /*
 117  * architecture specific setup
 118  */
 119 void __init setup_arch(char **cmdline_p)
 120 {
 121         unsigned long bootmap_size;
 122         unsigned long kstart_pfn, start_pfn, free_pfn, end_pfn;
 123
 124         cpu_init();
 125         unit_setup();
 126         parse_mem_cmdline(cmdline_p);
 127
 128         init_mm.start_code = (unsigned long)&_text;
 129         init_mm.end_code = (unsigned long) &_etext;
 130         init_mm.end_data = (unsigned long) &_edata;
 131         init_mm.brk = (unsigned long) &_end;
 132
 133         code_resource.start = virt_to_bus(&_text);
 134         code_resource.end = virt_to_bus(&_etext)-1;
 135         data_resource.start = virt_to_bus(&_etext);
 136         data_resource.end = virt_to_bus(&_edata)-1;
 137
 138         start_pfn = (CONFIG_KERNEL_RAM_BASE_ADDRESS >> PAGE_SHIFT);
 139         kstart_pfn = PFN_UP(__pa(&_text));
 140         free_pfn = PFN_UP(__pa(&_end));
 141         end_pfn = PFN_DOWN(__pa(memory_end));
 142
 143         bootmap_size = init_bootmem_node(&contig_page_data,
 144                                          free_pfn,
 145                                          start_pfn,
 146                                          end_pfn);
 147
 148         if (kstart_pfn > start_pfn)
 149                 free_bootmem(PFN_PHYS(start_pfn),
 150                              PFN_PHYS(kstart_pfn - start_pfn));
 151
 152         free_bootmem(PFN_PHYS(free_pfn),
 153                      PFN_PHYS(end_pfn - free_pfn));
 154
 155         /* If interrupt vector table is in main ram, then we need to
 156            reserve the page it is occupying. */
 157         if (CONFIG_INTERRUPT_VECTOR_BASE >= CONFIG_KERNEL_RAM_BASE_ADDRESS &&
 158             CONFIG_INTERRUPT_VECTOR_BASE < memory_end)
 159                 reserve_bootmem(CONFIG_INTERRUPT_VECTOR_BASE, PAGE_SIZE,
 160                                 BOOTMEM_DEFAULT);
 161
 162         reserve_bootmem(PAGE_ALIGN(PFN_PHYS(free_pfn)), bootmap_size,
 163                         BOOTMEM_DEFAULT);
 164
 165 #ifdef CONFIG_VT
 166 #if defined(CONFIG_VGA_CONSOLE)
 167         conswitchp = &vga_con;
 168 #elif defined(CONFIG_DUMMY_CONSOLE)
 169         conswitchp = &dummy_con;
 170 #endif
 171 #endif
 172
 173         paging_init();
 174 }
 175
 176 /*
 177  * perform CPU initialisation
 178  */
 179 void __init cpu_init(void)
 180 {
 181         unsigned long cpurev = CPUREV, type;
 182         unsigned long base, size;
 183
 184         type = (CPUREV & CPUREV_TYPE) >> CPUREV_TYPE_S;
 185         if (type > mn10300_known_cpus)
 186                 type = mn10300_known_cpus;
 187
 188         printk(KERN_INFO "Matsushita %s, rev %ld\n",
 189                mn10300_cputypes[type],
 190                (cpurev & CPUREV_REVISION) >> CPUREV_REVISION_S);
 191
 192         /* determine the memory size and base from the memory controller regs */
 193         memory_size = 0;
 194
 195         base = SDBASE(0);
 196         if (base & SDBASE_CE) {
 197                 size = (base & SDBASE_CBAM) << SDBASE_CBAM_SHIFT;
 198                 size = ~size + 1;
 199                 base &= SDBASE_CBA;
 200
 201                 printk(KERN_INFO "SDRAM[0]: %luMb @%08lx\n", size >> 20, base);
 202                 memory_size += size;
 203                 phys_memory_base = base;
 204         }
 205
 206         base = SDBASE(1);
 207         if (base & SDBASE_CE) {
 208                 size = (base & SDBASE_CBAM) << SDBASE_CBAM_SHIFT;
 209                 size = ~size + 1;
 210                 base &= SDBASE_CBA;
 211
 212                 printk(KERN_INFO "SDRAM[1]: %luMb @%08lx\n", size >> 20, base);
 213                 memory_size += size;
 214                 if (phys_memory_base == 0)
 215                         phys_memory_base = base;
 216         }
 217
 218         phys_memory_end = phys_memory_base + memory_size;
 219
 220 #ifdef CONFIG_FPU
 221         fpu_init_state();
 222 #endif
 223 }
 224
 225 /*
 226  * Get CPU information for use by the procfs.
 227  */
 228 static int show_cpuinfo(struct seq_file *m, void *v)
 229 {
 230         unsigned long cpurev = CPUREV, type, icachesz, dcachesz;
 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  : 0\n"
 248                    "vendor_id  : Matsushita\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                    mn10300_cputypes[type],
 255                    (cpurev & CPUREV_REVISION) >> CPUREV_REVISION_S,
 256                    icachesz,
 257                    dcachesz
 258                    );
 259
 260         seq_printf(m,
 261                    "ioclk speed: %lu.%02luMHz\n"
 262                    "bogomips   : %lu.%02lu\n\n",
 263                    MN10300_IOCLK / 1000000,
 264                    (MN10300_IOCLK / 10000) % 100,
 265                    loops_per_jiffy / (500000 / HZ),
 266                    (loops_per_jiffy / (5000 / HZ)) % 100
 267                    );
 268
 269         return 0;
 270 }
 271
 272 static void *c_start(struct seq_file *m, loff_t *pos)
 273 {
 274         return *pos < NR_CPUS ? cpu_data + *pos : NULL;
 275 }
 276
 277 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 278 {
 279         ++*pos;
 280         return c_start(m, pos);
 281 }
 282
 283 static void c_stop(struct seq_file *m, void *v)
 284 {
 285 }
 286
 287 const struct seq_operations cpuinfo_op = {
 288         .start  = c_start,
 289         .next   = c_next,
 290         .stop   = c_stop,
 291         .show   = show_cpuinfo,
 292 };