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/* cpu.c: Dinky routines to look for the kind of Sparc cpu
* we are on.
*
* Copyright (C) 1996, 2007 David S. Miller (davem@davemloft.net)
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/smp.h>
#include <asm/asi.h>
#include <asm/system.h>
#include <asm/fpumacro.h>
#include <asm/cpudata.h>
#include <asm/spitfire.h>
#include <asm/oplib.h>
#include "entry.h"
DEFINE_PER_CPU(cpuinfo_sparc, __cpu_data) = { 0 };
struct cpu_iu_info {
short manuf;
short impl;
char* cpu_name; /* should be enough I hope... */
};
struct cpu_fp_info {
short manuf;
short impl;
char fpu_vers;
char* fp_name;
};
static struct cpu_fp_info linux_sparc_fpu[] = {
{ 0x17, 0x10, 0, "UltraSparc I integrated FPU"},
{ 0x22, 0x10, 0, "UltraSparc I integrated FPU"},
{ 0x17, 0x11, 0, "UltraSparc II integrated FPU"},
{ 0x17, 0x12, 0, "UltraSparc IIi integrated FPU"},
{ 0x17, 0x13, 0, "UltraSparc IIe integrated FPU"},
{ 0x3e, 0x14, 0, "UltraSparc III integrated FPU"},
{ 0x3e, 0x15, 0, "UltraSparc III+ integrated FPU"},
{ 0x3e, 0x16, 0, "UltraSparc IIIi integrated FPU"},
{ 0x3e, 0x18, 0, "UltraSparc IV integrated FPU"},
{ 0x3e, 0x19, 0, "UltraSparc IV+ integrated FPU"},
{ 0x3e, 0x22, 0, "UltraSparc IIIi+ integrated FPU"},
};
#define NSPARCFPU ARRAY_SIZE(linux_sparc_fpu)
static struct cpu_iu_info linux_sparc_chips[] = {
{ 0x17, 0x10, "TI UltraSparc I (SpitFire)"},
{ 0x22, 0x10, "TI UltraSparc I (SpitFire)"},
{ 0x17, 0x11, "TI UltraSparc II (BlackBird)"},
{ 0x17, 0x12, "TI UltraSparc IIi (Sabre)"},
{ 0x17, 0x13, "TI UltraSparc IIe (Hummingbird)"},
{ 0x3e, 0x14, "TI UltraSparc III (Cheetah)"},
{ 0x3e, 0x15, "TI UltraSparc III+ (Cheetah+)"},
{ 0x3e, 0x16, "TI UltraSparc IIIi (Jalapeno)"},
{ 0x3e, 0x18, "TI UltraSparc IV (Jaguar)"},
{ 0x3e, 0x19, "TI UltraSparc IV+ (Panther)"},
{ 0x3e, 0x22, "TI UltraSparc IIIi+ (Serrano)"},
};
#define NSPARCCHIPS ARRAY_SIZE(linux_sparc_chips)
char *sparc_cpu_type;
char *sparc_fpu_type;
static void __init sun4v_cpu_probe(void)
{
switch (sun4v_chip_type) {
case SUN4V_CHIP_NIAGARA1:
sparc_cpu_type = "UltraSparc T1 (Niagara)";
sparc_fpu_type = "UltraSparc T1 integrated FPU";
break;
case SUN4V_CHIP_NIAGARA2:
sparc_cpu_type = "UltraSparc T2 (Niagara2)";
sparc_fpu_type = "UltraSparc T2 integrated FPU";
break;
default:
printk(KERN_WARNING "CPU: Unknown sun4v cpu type [%s]\n",
prom_cpu_compatible);
sparc_cpu_type = "Unknown SUN4V CPU";
sparc_fpu_type = "Unknown SUN4V FPU";
break;
}
}
void __init cpu_probe(void)
{
unsigned long ver, fpu_vers, manuf, impl, fprs;
int i;
if (tlb_type == hypervisor) {
sun4v_cpu_probe();
return;
}
fprs = fprs_read();
fprs_write(FPRS_FEF);
__asm__ __volatile__ ("rdpr %%ver, %0; stx %%fsr, [%1]"
: "=&r" (ver)
: "r" (&fpu_vers));
fprs_write(fprs);
manuf = ((ver >> 48) & 0xffff);
impl = ((ver >> 32) & 0xffff);
fpu_vers = ((fpu_vers >> 17) & 0x7);
retry:
for (i = 0; i < NSPARCCHIPS; i++) {
if (linux_sparc_chips[i].manuf == manuf) {
if (linux_sparc_chips[i].impl == impl) {
sparc_cpu_type =
linux_sparc_chips[i].cpu_name;
break;
}
}
}
if (i == NSPARCCHIPS) {
/* Maybe it is a cheetah+ derivative, report it as cheetah+
* in that case until we learn the real names.
*/
if (manuf == 0x3e &&
impl > 0x15) {
impl = 0x15;
goto retry;
} else {
printk("DEBUG: manuf[%lx] impl[%lx]\n",
manuf, impl);
}
sparc_cpu_type = "Unknown CPU";
}
for (i = 0; i < NSPARCFPU; i++) {
if (linux_sparc_fpu[i].manuf == manuf &&
linux_sparc_fpu[i].impl == impl) {
if (linux_sparc_fpu[i].fpu_vers == fpu_vers) {
sparc_fpu_type =
linux_sparc_fpu[i].fp_name;
break;
}
}
}
if (i == NSPARCFPU) {
printk("DEBUG: manuf[%lx] impl[%lx] fsr.vers[%lx]\n",
manuf, impl, fpu_vers);
sparc_fpu_type = "Unknown FPU";
}
}
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