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/*
* arch/sh/kernel/cpu/sh4/probe.c
*
* CPU Subtype Probing for SH-4.
*
* Copyright (C) 2001, 2002, 2003, 2004 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) & 0xffff;
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.entry_mask = 0x1fe0;
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.entry_mask = 0x3fe0;
cpu_data->dcache.sets = 512;
cpu_data->dcache.ways = 1;
cpu_data->dcache.linesz = L1_CACHE_BYTES;
/* Set the FPU flag, virtually all SH-4's have one */
cpu_data->flags |= CPU_HAS_FPU;
/*
* 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_PERF_COUNTER;
break;
case 0x206:
cpu_data->type = CPU_SH7750S;
cpu_data->flags |= CPU_HAS_P2_FLUSH_BUG | CPU_HAS_PERF_COUNTER;
break;
case 0x1100:
cpu_data->type = CPU_SH7751;
break;
case 0x2000:
cpu_data->type = CPU_SH73180;
cpu_data->icache.ways = 4;
cpu_data->dcache.ways = 4;
cpu_data->flags &= ~CPU_HAS_FPU;
break;
case 0x8000:
cpu_data->type = CPU_ST40RA;
break;
case 0x8100:
cpu_data->type = CPU_ST40GX1;
break;
case 0x700:
cpu_data->type = CPU_SH4_501;
cpu_data->icache.ways = 2;
cpu_data->dcache.ways = 2;
/* No FPU on the SH4-500 series.. */
cpu_data->flags &= ~CPU_HAS_FPU;
break;
case 0x600:
cpu_data->type = CPU_SH4_202;
cpu_data->icache.ways = 2;
cpu_data->dcache.ways = 2;
break;
case 0x500 ... 0x501:
switch (prr) {
case 0x10: cpu_data->type = CPU_SH7750R; break;
case 0x11: cpu_data->type = CPU_SH7751R; break;
case 0x50: cpu_data->type = CPU_SH7760; break;
}
cpu_data->icache.ways = 2;
cpu_data->dcache.ways = 2;
break;
default:
cpu_data->type = CPU_SH_NONE;
break;
}
/*
* 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);
cpu_data->icache.entry_mask =
(cpu_data->icache.way_incr - (1 << 5));
}
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 - (1 << 5));
}
return 0;
}
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