- 根目录:
- arch
- sh
- kernel
- cpu
- sh4
- probe.c
/*
* arch/sh/kernel/cpu/sh4/probe.c
*
* CPU Subtype Probing for SH-4.
*
* Copyright (C) 2001 - 2007 Paul Mundt
* Copyright (C) 2003 Richard Curnow
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/init.h>
#include <linux/io.h>
#include <asm/processor.h>
#include <asm/cache.h>
void __cpuinit cpu_probe(void)
{
unsigned long pvr, prr, cvr;
unsigned long size;
static unsigned long sizes[16] = {
[1] = (1 << 12),
[2] = (1 << 13),
[4] = (1 << 14),
[8] = (1 << 15),
[9] = (1 << 16)
};
pvr = (__raw_readl(CCN_PVR) >> 8) & 0xffffff;
prr = (__raw_readl(CCN_PRR) >> 4) & 0xff;
cvr = (__raw_readl(CCN_CVR));
/*
* Setup some sane SH-4 defaults for the icache
*/
boot_cpu_data.icache.way_incr = (1 << 13);
boot_cpu_data.icache.entry_shift = 5;
boot_cpu_data.icache.sets = 256;
boot_cpu_data.icache.ways = 1;
boot_cpu_data.icache.linesz = L1_CACHE_BYTES;
/*
* And again for the dcache ..
*/
boot_cpu_data.dcache.way_incr = (1 << 14);
boot_cpu_data.dcache.entry_shift = 5;
boot_cpu_data.dcache.sets = 512;
boot_cpu_data.dcache.ways = 1;
boot_cpu_data.dcache.linesz = L1_CACHE_BYTES;
/* We don't know the chip cut */
boot_cpu_data.cut_major = boot_cpu_data.cut_minor = -1;
/*
* Setup some generic flags we can probe on SH-4A parts
*/
if (((pvr >> 16) & 0xff) == 0x10) {
boot_cpu_data.family = CPU_FAMILY_SH4A;
if ((cvr & 0x10000000) == 0) {
boot_cpu_data.flags |= CPU_HAS_DSP;
boot_cpu_data.family = CPU_FAMILY_SH4AL_DSP;
}
boot_cpu_data.flags |= CPU_HAS_LLSC | CPU_HAS_PERF_COUNTER;
boot_cpu_data.cut_major = pvr & 0x7f;
boot_cpu_data.icache.ways = 4;
boot_cpu_data.dcache.ways = 4;
} else {
/* And some SH-4 defaults.. */
boot_cpu_data.flags |= CPU_HAS_PTEA | CPU_HAS_FPU;
boot_cpu_data.family = CPU_FAMILY_SH4;
}
/* FPU detection works for almost everyone */
if ((cvr & 0x20000000))
boot_cpu_data.flags |= CPU_HAS_FPU;
/* Mask off the upper chip ID */
pvr &= 0xffff;
/*
* Probe the underlying processor version/revision and
* adjust cpu_data setup accordingly.
*/
switch (pvr) {
case 0x205:
boot_cpu_data.type = CPU_SH7750;
boot_cpu_data.flags |= CPU_HAS_P2_FLUSH_BUG |
CPU_HAS_PERF_COUNTER;
break;
case 0x206:
boot_cpu_data.type = CPU_SH7750S;
boot_cpu_data.flags |= CPU_HAS_P2_FLUSH_BUG |
CPU_HAS_PERF_COUNTER;
break;
case 0x1100:
boot_cpu_data.type = CPU_SH7751;
break;
case 0x2001:
case 0x2004:
boot_cpu_data.type = CPU_SH7770;
break;
case 0x2006:
case 0x200A:
if (prr == 0x61)
boot_cpu_data.type = CPU_SH7781;
else if (prr == 0xa1)
boot_cpu_data.type = CPU_SH7763;
else
boot_cpu_data.type = CPU_SH7780;
break;
case 0x3000:
case 0x3003:
case 0x3009:
boot_cpu_data.type = CPU_SH7343;
break;
case 0x3004:
case 0x3007:
boot_cpu_data.type = CPU_SH7785;
break;
case 0x4004:
case 0x4005:
boot_cpu_data.type = CPU_SH7786;
boot_cpu_data.flags |= CPU_HAS_PTEAEX | CPU_HAS_L2_CACHE;
break;
case 0x3008:
switch (prr) {
case 0x50:
case 0x51:
boot_cpu_data.type = CPU_SH7723;
boot_cpu_data.flags |= CPU_HAS_L2_CACHE;
break;
case 0x70:
boot_cpu_data.type = CPU_SH7366;
break;
case 0xa0:
case 0xa1:
boot_cpu_data.type = CPU_SH7722;
break;
}
break;
case 0x300b:
switch (prr) {
case 0x20:
boot_cpu_data.type = CPU_SH7724;
boot_cpu_data.flags |= CPU_HAS_L2_CACHE;
break;
case 0x10:
case 0x11:
boot_cpu_data.type = CPU_SH7757;
break;
case 0xd0:
case 0x40: /* yon-ten-go */
boot_cpu_data.type = CPU_SH7372;
break;
}
break;
case 0x4000: /* 1st cut */
case 0x4001: /* 2nd cut */
boot_cpu_data.type = CPU_SHX3;
break;
case 0x700:
boot_cpu_data.type = CPU_SH4_501;
boot_cpu_data.flags &= ~CPU_HAS_FPU;
boot_cpu_data.icache.ways = 2;
boot_cpu_data.dcache.ways = 2;
break;
case 0x600:
boot_cpu_data.type = CPU_SH4_202;
boot_cpu_data.icache.ways = 2;
boot_cpu_data.dcache.ways = 2;
break;
case 0x500 ... 0x501:
switch (prr) {
case 0x10:
boot_cpu_data.type = CPU_SH7750R;
break;
case 0x11:
boot_cpu_data.type = CPU_SH7751R;
break;
case 0x50 ... 0x5f:
boot_cpu_data.type = CPU_SH7760;
break;
}
boot_cpu_data.icache.ways = 2;
boot_cpu_data.dcache.ways = 2;
break;
}
/*
* On anything that's not a direct-mapped cache, look to the CVR
* for I/D-cache specifics.
*/
if (boot_cpu_data.icache.ways > 1) {
size = sizes[(cvr >> 20) & 0xf];
boot_cpu_data.icache.way_incr = (size >> 1);
boot_cpu_data.icache.sets = (size >> 6);
}
/* And the rest of the D-cache */
if (boot_cpu_data.dcache.ways > 1) {
size = sizes[(cvr >> 16) & 0xf];
boot_cpu_data.dcache.way_incr = (size >> 1);
boot_cpu_data.dcache.sets = (size >> 6);
}
/*
* SH-4A's have an optional PIPT L2.
*/
if (boot_cpu_data.flags & CPU_HAS_L2_CACHE) {
/*
* Verify that it really has something hooked up, this
* is the safety net for CPUs that have optional L2
* support yet do not implement it.
*/
if ((cvr & 0xf) == 0)
boot_cpu_data.flags &= ~CPU_HAS_L2_CACHE;
else {
/*
* Silicon and specifications have clearly never
* met..
*/
cvr ^= 0xf;
/*
* Size calculation is much more sensible
* than it is for the L1.
*
* Sizes are 128KB, 256KB, 512KB, and 1MB.
*/
size = (cvr & 0xf) << 17;
boot_cpu_data.scache.way_incr = (1 << 16);
boot_cpu_data.scache.entry_shift = 5;
boot_cpu_data.scache.ways = 4;
boot_cpu_data.scache.linesz = L1_CACHE_BYTES;
boot_cpu_data.scache.entry_mask =
(boot_cpu_data.scache.way_incr -
boot_cpu_data.scache.linesz);
boot_cpu_data.scache.sets = size /
(boot_cpu_data.scache.linesz *
boot_cpu_data.scache.ways);
boot_cpu_data.scache.way_size =
(boot_cpu_data.scache.sets *
boot_cpu_data.scache.linesz);
}
}
}