arch/sparc64/kernel/cpu.c

   1 /* cpu.c: Dinky routines to look for the kind of Sparc cpu
   2  *        we are on.
   3  *
   4  * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
   5  */
   6
   7 #include <linux/config.h>
   8 #include <linux/kernel.h>
   9 #include <linux/init.h>
  10 #include <linux/sched.h>
  11 #include <linux/smp.h>
  12 #include <asm/asi.h>
  13 #include <asm/system.h>
  14 #include <asm/fpumacro.h>
  15 #include <asm/cpudata.h>
  16
  17 DEFINE_PER_CPU(cpuinfo_sparc, __cpu_data) = { 0 };
  18
  19 struct cpu_iu_info {
  20   short manuf;
  21   short impl;
  22   char* cpu_name;   /* should be enough I hope... */
  23 };
  24
  25 struct cpu_fp_info {
  26   short manuf;
  27   short impl;
  28   char fpu_vers;
  29   char* fp_name;
  30 };
  31
  32 struct cpu_fp_info linux_sparc_fpu[] = {
  33   { 0x17, 0x10, 0, "UltraSparc I integrated FPU"},
  34   { 0x22, 0x10, 0, "UltraSparc I integrated FPU"},
  35   { 0x17, 0x11, 0, "UltraSparc II integrated FPU"},
  36   { 0x17, 0x12, 0, "UltraSparc IIi integrated FPU"},
  37   { 0x17, 0x13, 0, "UltraSparc IIe integrated FPU"},
  38   { 0x3e, 0x14, 0, "UltraSparc III integrated FPU"},
  39   { 0x3e, 0x15, 0, "UltraSparc III+ integrated FPU"},
  40   { 0x3e, 0x16, 0, "UltraSparc IIIi integrated FPU"},
  41 };
  42
  43 #define NSPARCFPU  (sizeof(linux_sparc_fpu)/sizeof(struct cpu_fp_info))
  44
  45 struct cpu_iu_info linux_sparc_chips[] = {
  46   { 0x17, 0x10, "TI UltraSparc I   (SpitFire)"},
  47   { 0x22, 0x10, "TI UltraSparc I   (SpitFire)"},
  48   { 0x17, 0x11, "TI UltraSparc II  (BlackBird)"},
  49   { 0x17, 0x12, "TI UltraSparc IIi (Sabre)"},
  50   { 0x17, 0x13, "TI UltraSparc IIe (Hummingbird)"},
  51   { 0x3e, 0x14, "TI UltraSparc III (Cheetah)"},
  52   { 0x3e, 0x15, "TI UltraSparc III+ (Cheetah+)"},
  53   { 0x3e, 0x16, "TI UltraSparc IIIi (Jalapeno)"},
  54 };
  55
  56 #define NSPARCCHIPS  (sizeof(linux_sparc_chips)/sizeof(struct cpu_iu_info))
  57
  58 char *sparc_cpu_type = "cpu-oops";
  59 char *sparc_fpu_type = "fpu-oops";
  60
  61 unsigned int fsr_storage;
  62
  63 void __init cpu_probe(void)
  64 {
  65         unsigned long ver, fpu_vers, manuf, impl, fprs;
  66         int i;
  67
  68         fprs = fprs_read();
  69         fprs_write(FPRS_FEF);
  70         __asm__ __volatile__ ("rdpr %%ver, %0; stx %%fsr, [%1]"
  71                               : "=&r" (ver)
  72                               : "r" (&fpu_vers));
  73         fprs_write(fprs);
  74
  75         manuf = ((ver >> 48) & 0xffff);
  76         impl = ((ver >> 32) & 0xffff);
  77
  78         fpu_vers = ((fpu_vers >> 17) & 0x7);
  79
  80 retry:
  81         for (i = 0; i < NSPARCCHIPS; i++) {
  82                 if (linux_sparc_chips[i].manuf == manuf) {
  83                         if (linux_sparc_chips[i].impl == impl) {
  84                                 sparc_cpu_type =
  85                                         linux_sparc_chips[i].cpu_name;
  86                                 break;
  87                         }
  88                 }
  89         }
  90
  91         if (i == NSPARCCHIPS) {
  92                 /* Maybe it is a cheetah+ derivative, report it as cheetah+
  93                  * in that case until we learn the real names.
  94                  */
  95                 if (manuf == 0x3e &&
  96                     impl > 0x15) {
  97                         impl = 0x15;
  98                         goto retry;
  99                 } else {
 100                         printk("DEBUG: manuf[%lx] impl[%lx]\n",
 101                                manuf, impl);
 102                 }
 103                 sparc_cpu_type = "Unknown CPU";
 104         }
 105
 106         for (i = 0; i < NSPARCFPU; i++) {
 107                 if (linux_sparc_fpu[i].manuf == manuf &&
 108                     linux_sparc_fpu[i].impl == impl) {
 109                         if (linux_sparc_fpu[i].fpu_vers == fpu_vers) {
 110                                 sparc_fpu_type =
 111                                         linux_sparc_fpu[i].fp_name;
 112                                 break;
 113                         }
 114                 }
 115         }
 116
 117         if (i == NSPARCFPU) {
 118                 printk("DEBUG: manuf[%lx] impl[%lx] fsr.vers[%lx]\n",
 119                        manuf, impl, fpu_vers);
 120                 sparc_fpu_type = "Unknown FPU";
 121         }
 122 }