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/*
* arch/sh/kernel/cpu/sh4/probe.c
*
* CPU Subtype Probing for SH-4.
*
* Copyright (C) 2001 - 2006 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 <asm/processor.h>
#include <asm/cache.h>
#include <asm/io.h>
int __init detect_cpu_and_cache_system(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 = (ctrl_inl(CCN_PVR) >> 8) & 0xffffff;
prr = (ctrl_inl(CCN_PRR) >> 4) & 0xff;
cvr = (ctrl_inl(CCN_CVR));
/*
* Setup some sane SH-4 defaults for the icache
*/
cpu_data->icache.way_incr = (1 << 13);
cpu_data->icache.entry_shift = 5;
cpu_data->icache.sets = 256;
cpu_data->icache.ways = 1;
cpu_data->icache.linesz = L1_CACHE_BYTES;
/*
* And again for the dcache ..
*/
cpu_data->dcache.way_incr = (1 << 14);
cpu_data->dcache.entry_shift = 5;
cpu_data->dcache.sets = 512;
cpu_data->dcache.ways = 1;
cpu_data->dcache.linesz = L1_CACHE_BYTES;
/*
* Setup some generic flags we can probe
* (L2 and DSP detection only work on SH-4A)
*/
if (((pvr >> 16) & 0xff) == 0x10) {
if ((cvr & 0x02000000) == 0)
cpu_data->flags |= CPU_HAS_L2_CACHE;
if ((cvr & 0x10000000) == 0)
cpu_data->flags |= CPU_HAS_DSP;
cpu_data->flags |= CPU_HAS_LLSC;
}
/* FPU detection works for everyone */
if ((cvr & 0x20000000) == 1)
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:
cpu_data->type = CPU_SH7750;
cpu_data->flags |= CPU_HAS_P2_FLUSH_BUG | CPU_HAS_FPU |
CPU_HAS_PERF_COUNTER;
break;
case 0x206:
cpu_data->type = CPU_SH7750S;
cpu_data->flags |= CPU_HAS_P2_FLUSH_BUG | CPU_HAS_FPU |
CPU_HAS_PERF_COUNTER;
break;
case 0x1100:
cpu_data->type = CPU_SH7751;
cpu_data->flags |= CPU_HAS_FPU;
break;
case 0x2000:
cpu_data->type = CPU_SH73180;
cpu_data->icache.ways = 4;
cpu_data->dcache.ways = 4;
cpu_data->flags |= CPU_HAS_LLSC;
break;
case 0x2001:
case 0x2004:
cpu_data->type = CPU_SH7770;
cpu_data->icache.ways = 4;
cpu_data->dcache.ways = 4;
cpu_data->flags |= CPU_HAS_FPU | CPU_HAS_LLSC;
break;
case 0x2006:
case 0x200A:
if (prr == 0x61)
cpu_data->type = CPU_SH7781;
else
cpu_data->type = CPU_SH7780;
cpu_data->icache.ways = 4;
cpu_data->dcache.ways = 4;
cpu_data->flags |= CPU_HAS_FPU | CPU_HAS_PERF_COUNTER |
CPU_HAS_LLSC;
break;
case 0x3000:
case 0x3003:
case 0x3009:
cpu_data->type = CPU_SH7343;
cpu_data->icache.ways = 4;
cpu_data->dcache.ways = 4;
cpu_data->flags |= CPU_HAS_LLSC;
break;
case 0x3008:
if (prr == 0xa0) {
cpu_data->type = CPU_SH7722;
cpu_data->icache.ways = 4;
cpu_data->dcache.ways = 4;
cpu_data->flags |= CPU_HAS_LLSC;
}
break;
case 0x8000:
cpu_data->type = CPU_ST40RA;
cpu_data->flags |= CPU_HAS_FPU;
break;
case 0x8100:
cpu_data->type = CPU_ST40GX1;
cpu_data->flags |= CPU_HAS_FPU;
break;
case 0x700:
cpu_data->type = CPU_SH4_501;
cpu_data->icache.ways = 2;
cpu_data->dcache.ways = 2;
break;
case 0x600:
cpu_data->type = CPU_SH4_202;
cpu_data->icache.ways = 2;
cpu_data->dcache.ways = 2;
cpu_data->flags |= CPU_HAS_FPU;
break;
case 0x500 ... 0x501:
switch (prr) {
case 0x10:
cpu_data->type = CPU_SH7750R;
break;
case 0x11:
cpu_data->type = CPU_SH7751R;
break;
case 0x50 ... 0x5f:
cpu_data->type = CPU_SH7760;
break;
}
cpu_data->icache.ways = 2;
cpu_data->dcache.ways = 2;
cpu_data->flags |= CPU_HAS_FPU;
break;
default:
cpu_data->type = CPU_SH_NONE;
break;
}
#ifdef CONFIG_SH_DIRECT_MAPPED
cpu_data->icache.ways = 1;
cpu_data->dcache.ways = 1;
#endif
/*
* On anything that's not a direct-mapped cache, look to the CVR
* for I/D-cache specifics.
*/
if (cpu_data->icache.ways > 1) {
size = sizes[(cvr >> 20) & 0xf];
cpu_data->icache.way_incr = (size >> 1);
cpu_data->icache.sets = (size >> 6);
}
/* Setup the rest of the I-cache info */
cpu_data->icache.entry_mask = cpu_data->icache.way_incr -
cpu_data->icache.linesz;
cpu_data->icache.way_size = cpu_data->icache.sets *
cpu_data->icache.linesz;
/* And the rest of the D-cache */
if (cpu_data->dcache.ways > 1) {
size = sizes[(cvr >> 16) & 0xf];
cpu_data->dcache.way_incr = (size >> 1);
cpu_data->dcache.sets = (size >> 6);
}
cpu_data->dcache.entry_mask = cpu_data->dcache.way_incr -
cpu_data->dcache.linesz;
cpu_data->dcache.way_size = cpu_data->dcache.sets *
cpu_data->dcache.linesz;
/*
* Setup the L2 cache desc
*
* SH-4A's have an optional PIPT L2.
*/
if (cpu_data->flags & CPU_HAS_L2_CACHE) {
/*
* Size calculation is much more sensible
* than it is for the L1.
*
* Sizes are 128KB, 258KB, 512KB, and 1MB.
*/
size = (cvr & 0xf) << 17;
BUG_ON(!size);
cpu_data->scache.way_incr = (1 << 16);
cpu_data->scache.entry_shift = 5;
cpu_data->scache.ways = 4;
cpu_data->scache.linesz = L1_CACHE_BYTES;
cpu_data->scache.entry_mask =
(cpu_data->scache.way_incr - cpu_data->scache.linesz);
cpu_data->scache.sets = size /
(cpu_data->scache.linesz * cpu_data->scache.ways);
cpu_data->scache.way_size =
(cpu_data->scache.sets * cpu_data->scache.linesz);
}
return 0;
}
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