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   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/a.out.h>
  21 #include <linux/tty.h>
  22 #include <linux/ioport.h>
  23 #include <linux/delay.h>
  24 #include <linux/init.h>
  25 #include <linux/bootmem.h>
  26 #include <linux/seq_file.h>
  27 #include <asm/processor.h>
  28 #include <linux/console.h>
  29 #include <asm/uaccess.h>
  30 #include <asm/system.h>
  31 #include <asm/setup.h>
  32 #include <asm/io.h>
  33 #include <asm/smp.h>
  34 #include <asm/proc/proc.h>
  35 #include <asm/busctl-regs.h>
  36 #include <asm/fpu.h>
  37 #include <asm/sections.h>
  38
  39 struct mn10300_cpuinfo boot_cpu_data;
  40
  41 /* For PCI or other memory-mapped resources */
  42 unsigned long pci_mem_start = 0x18000000;
  43
  44 char redboot_command_line[COMMAND_LINE_SIZE] =
  45         "console=ttyS0,115200 root=/dev/mtdblock3 rw";
  46
  47 char __initdata redboot_platform_name[COMMAND_LINE_SIZE];
  48
  49 static struct resource code_resource = {
  50         .start  = 0x100000,
  51         .end    = 0,
  52         .name   = "Kernel code",
  53 };
  54
  55 static struct resource data_resource = {
  56         .start  = 0,
  57         .end    = 0,
  58         .name   = "Kernel data",
  59 };
  60
  61 static unsigned long __initdata phys_memory_base;
  62 static unsigned long __initdata phys_memory_end;
  63 static unsigned long __initdata memory_end;
  64 unsigned long memory_size;
  65
  66 struct thread_info *__current_ti = &init_thread_union.thread_info;
  67 struct task_struct *__current = &init_task;
  68
  69 #define mn10300_known_cpus 3
  70 static const char *const mn10300_cputypes[] = {
  71         "am33v1",
  72         "am33v2",
  73         "am34v1",
  74         "unknown"
  75 };
  76
  77 /*
  78  *
  79  */
  80 static void __init parse_mem_cmdline(char **cmdline_p)
  81 {
  82         char *from, *to, c;
  83
  84         /* save unparsed command line copy for /proc/cmdline */
  85         strcpy(boot_command_line, redboot_command_line);
  86
  87         /* see if there's an explicit memory size option */
  88         from = redboot_command_line;
  89         to = redboot_command_line;
  90         c = ' ';
  91
  92         for (;;) {
  93                 if (c == ' ' && !memcmp(from, "mem=", 4)) {
  94                         if (to != redboot_command_line)
  95                                 to--;
  96                         memory_size = memparse(from + 4, &from);
  97                 }
  98
  99                 c = *(from++);
 100                 if (!c)
 101                         break;
 102
 103                 *(to++) = c;
 104         }
 105
 106         *to = '\0';
 107         *cmdline_p = redboot_command_line;
 108
 109         if (memory_size == 0)
 110                 panic("Memory size not known\n");
 111
 112         memory_end = (unsigned long) CONFIG_KERNEL_RAM_BASE_ADDRESS +
 113                 memory_size;
 114         if (memory_end > phys_memory_end)
 115                 memory_end = phys_memory_end;
 116 }
 117
 118 /*
 119  * architecture specific setup
 120  */
 121 void __init setup_arch(char **cmdline_p)
 122 {
 123         unsigned long bootmap_size;
 124         unsigned long kstart_pfn, start_pfn, free_pfn, end_pfn;
 125
 126         cpu_init();
 127         unit_setup();
 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 #define PFN_UP(x)       (((x) + PAGE_SIZE-1) >> PAGE_SHIFT)
 141 #define PFN_DOWN(x)     ((x) >> PAGE_SHIFT)
 142 #define PFN_PHYS(x)     ((x) << PAGE_SHIFT)
 143
 144         start_pfn = (CONFIG_KERNEL_RAM_BASE_ADDRESS >> PAGE_SHIFT);
 145         kstart_pfn = PFN_UP(__pa(&_text));
 146         free_pfn = PFN_UP(__pa(&_end));
 147         end_pfn = PFN_DOWN(__pa(memory_end));
 148
 149         bootmap_size = init_bootmem_node(&contig_page_data,
 150                                          free_pfn,
 151                                          start_pfn,
 152                                          end_pfn);
 153
 154         if (kstart_pfn > start_pfn)
 155                 free_bootmem(PFN_PHYS(start_pfn),
 156                              PFN_PHYS(kstart_pfn - start_pfn));
 157
 158         free_bootmem(PFN_PHYS(free_pfn),
 159                      PFN_PHYS(end_pfn - free_pfn));
 160
 161         /* If interrupt vector table is in main ram, then we need to
 162            reserve the page it is occupying. */
 163         if (CONFIG_INTERRUPT_VECTOR_BASE >= CONFIG_KERNEL_RAM_BASE_ADDRESS &&
 164             CONFIG_INTERRUPT_VECTOR_BASE < memory_end)
 165                 reserve_bootmem(CONFIG_INTERRUPT_VECTOR_BASE, 1,
 166                                 BOOTMEM_DEFAULT);
 167
 168         reserve_bootmem(PAGE_ALIGN(PFN_PHYS(free_pfn)), bootmap_size,
 169                         BOOTMEM_DEFAULT);
 170
 171 #ifdef CONFIG_VT
 172 #if defined(CONFIG_VGA_CONSOLE)
 173         conswitchp = &vga_con;
 174 #elif defined(CONFIG_DUMMY_CONSOLE)
 175         conswitchp = &dummy_con;
 176 #endif
 177 #endif
 178
 179         paging_init();
 180 }
 181
 182 /*
 183  * perform CPU initialisation
 184  */
 185 void __init cpu_init(void)
 186 {
 187         unsigned long cpurev = CPUREV, type;
 188         unsigned long base, size;
 189
 190         type = (CPUREV & CPUREV_TYPE) >> CPUREV_TYPE_S;
 191         if (type > mn10300_known_cpus)
 192                 type = mn10300_known_cpus;
 193
 194         printk(KERN_INFO "Matsushita %s, rev %ld\n",
 195                mn10300_cputypes[type],
 196                (cpurev & CPUREV_REVISION) >> CPUREV_REVISION_S);
 197
 198         /* determine the memory size and base from the memory controller regs */
 199         memory_size = 0;
 200
 201         base = SDBASE(0);
 202         if (base & SDBASE_CE) {
 203                 size = (base & SDBASE_CBAM) << SDBASE_CBAM_SHIFT;
 204                 size = ~size + 1;
 205                 base &= SDBASE_CBA;
 206
 207                 printk(KERN_INFO "SDRAM[0]: %luMb @%08lx\n", size >> 20, base);
 208                 memory_size += size;
 209                 phys_memory_base = base;
 210         }
 211
 212         base = SDBASE(1);
 213         if (base & SDBASE_CE) {
 214                 size = (base & SDBASE_CBAM) << SDBASE_CBAM_SHIFT;
 215                 size = ~size + 1;
 216                 base &= SDBASE_CBA;
 217
 218                 printk(KERN_INFO "SDRAM[1]: %luMb @%08lx\n", size >> 20, base);
 219                 memory_size += size;
 220                 if (phys_memory_base == 0)
 221                         phys_memory_base = base;
 222         }
 223
 224         phys_memory_end = phys_memory_base + memory_size;
 225
 226 #ifdef CONFIG_FPU
 227         fpu_init_state();
 228 #endif
 229 }
 230
 231 /*
 232  * Get CPU information for use by the procfs.
 233  */
 234 static int show_cpuinfo(struct seq_file *m, void *v)
 235 {
 236         unsigned long cpurev = CPUREV, type, icachesz, dcachesz;
 237
 238         type = (CPUREV & CPUREV_TYPE) >> CPUREV_TYPE_S;
 239         if (type > mn10300_known_cpus)
 240                 type = mn10300_known_cpus;
 241
 242         icachesz =
 243                 ((cpurev & CPUREV_ICWAY ) >> CPUREV_ICWAY_S)  *
 244                 ((cpurev & CPUREV_ICSIZE) >> CPUREV_ICSIZE_S) *
 245                 1024;
 246
 247         dcachesz =
 248                 ((cpurev & CPUREV_DCWAY ) >> CPUREV_DCWAY_S)  *
 249                 ((cpurev & CPUREV_DCSIZE) >> CPUREV_DCSIZE_S) *
 250                 1024;
 251
 252         seq_printf(m,
 253                    "processor  : 0\n"
 254                    "vendor_id  : Matsushita\n"
 255                    "cpu core   : %s\n"
 256                    "cpu rev    : %lu\n"
 257                    "model name : " PROCESSOR_MODEL_NAME         "\n"
 258                    "icache size: %lu\n"
 259                    "dcache size: %lu\n",
 260                    mn10300_cputypes[type],
 261                    (cpurev & CPUREV_REVISION) >> CPUREV_REVISION_S,
 262                    icachesz,
 263                    dcachesz
 264                    );
 265
 266         seq_printf(m,
 267                    "ioclk speed: %lu.%02luMHz\n"
 268                    "bogomips   : %lu.%02lu\n\n",
 269                    MN10300_IOCLK / 1000000,
 270                    (MN10300_IOCLK / 10000) % 100,
 271                    loops_per_jiffy / (500000 / HZ),
 272                    (loops_per_jiffy / (5000 / HZ)) % 100
 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 struct seq_operations cpuinfo_op = {
 294         .start  = c_start,
 295         .next   = c_next,
 296         .stop   = c_stop,
 297         .show   = show_cpuinfo,
 298 };