xref: /src/sys/arch/powerpc/ibm4xx/cpu.c

/*	$NetBSD: cpu.c,v 1.2.8.2 2002/08/31 13:45:42 gehenna Exp $	*/

/*
 * Copyright 2001 Wasabi Systems, Inc.
 * All rights reserved.
 *
 * Written by Eduardo Horvath and Simon Burge for Wasabi Systems, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed for the NetBSD Project by
 *      Wasabi Systems, Inc.
 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
 *    or promote products derived from this software without specific prior
 *    written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/properties.h>

#include <machine/cpu.h>
#include <powerpc/ibm4xx/dev/plbvar.h>

struct cputab {
	int version;
	char *name;
};
static struct cputab models[] = {
	{ PVR_401A1 >> 16, "401A1" },
	{ PVR_401B2 >> 16, "401B21" },
	{ PVR_401C2 >> 16, "401C2" },
	{ PVR_401D2 >> 16, "401D2" },
	{ PVR_401E2 >> 16, "401E2" },
	{ PVR_401F2 >> 16, "401F2" },
	{ PVR_401G2 >> 16, "401G2" },
	{ PVR_403 >> 16, "403" },
	{ PVR_405GP >> 16, "405GP" },
	{ 0,		    NULL }
};

static int	cpumatch(struct device *, struct cfdata *, void *);
static void	cpuattach(struct device *, struct device *, void *);

struct cfattach cpu_ca = {
	sizeof(struct device), cpumatch, cpuattach
};

int ncpus;

struct cpu_info cpu_info_store;

int cpufound = 0;

static int
cpumatch(struct device *parent, struct cfdata *cf, void *aux)
{
	struct plb_attach_args *paa = aux;

	/* make sure that we're looking for a CPU */
	if (strcmp(paa->plb_name, cf->cf_driver->cd_name) != 0)
		return (0);

	return !cpufound;
}

static void
cpuattach(struct device *parent, struct device *self, void *aux)
{
	int pvr, cpu;
	int own, pcf, cas, pcl, aid;
	struct cputab *cp = models;
	unsigned int processor_freq;

	if (board_info_get("processor-frequency",
		&processor_freq, sizeof(processor_freq)) == -1)
		panic("no processor-frequency");

	cpufound++;
	ncpus++;

	asm ("mfpvr %0" : "=r"(pvr));
	cpu = pvr >> 16;

	/* Break PVR up into separate fields and print them out. */
	own = (pvr >> 20) & 0xfff;
	pcf = (pvr >> 16) & 0xf;
	cas = (pvr >> 10) & 0x3f;
	pcl = (pvr >> 6) & 0xf;
	aid = pvr & 0x3f;

	while (cp->name) {
		if (cp->version == cpu)
			break;
		cp++;
	}
	if (cp->name)
		strcpy(cpu_model, cp->name);
	else
		sprintf(cpu_model, "Version 0x%x", cpu);
	sprintf(cpu_model + strlen(cpu_model), " (Revision %d.%d)",
		(pvr >> 8) & 0xff, pvr & 0xff);

#if 1
	printf(": %dMHz %s\n", processor_freq / 1000 / 1000,
	    cpu_model);
#endif

	cpu_probe_cache();

	printf("Instruction cache size %d line size %d\n",
		curcpu()->ci_ci.icache_size, curcpu()->ci_ci.icache_line_size);
	printf("Data cache size %d line size %d\n",
		curcpu()->ci_ci.dcache_size, curcpu()->ci_ci.dcache_line_size);

#ifdef DEBUG
	/* It sux that the cache info here is useless. */
	printf("PVR: owner %x core family %x cache %x version %x asic %x\n",
		own, pcf, cas, pcl, aid);
#endif
}

/*
 * This routine must be explicitly called to initialize the
 * CPU cache information so cache flushe and memcpy operation
 * work.
 */
void
cpu_probe_cache()
{
	int version;

	/*
	 * First we need to identify the cpu and determine the
	 * cache line size, or things like memset/memcpy may lose
	 * badly.
	 */
	__asm __volatile("mfpvr %0" : "=r" (version));
	switch (version & 0xffff0000) {
	case PVR_401A1:
		curcpu()->ci_ci.dcache_size = 1024;
		curcpu()->ci_ci.dcache_line_size = 16;
		curcpu()->ci_ci.icache_size = 2848;
		curcpu()->ci_ci.icache_line_size = 16;
		break;
	case PVR_401B2:
		curcpu()->ci_ci.dcache_size = 8192;
		curcpu()->ci_ci.dcache_line_size = 16;
		curcpu()->ci_ci.icache_size = 16384;
		curcpu()->ci_ci.icache_line_size = 16;
		break;
	case PVR_401C2:
		curcpu()->ci_ci.dcache_size = 8192;
		curcpu()->ci_ci.dcache_line_size = 16;
		curcpu()->ci_ci.icache_size = 0;
		curcpu()->ci_ci.icache_line_size = 16;
		break;
	case PVR_401D2:
		curcpu()->ci_ci.dcache_size = 2848;
		curcpu()->ci_ci.dcache_line_size = 16;
		curcpu()->ci_ci.icache_size = 4096;
		curcpu()->ci_ci.icache_line_size = 16;
		break;
	case PVR_401E2:
		curcpu()->ci_ci.dcache_size = 0;
		curcpu()->ci_ci.dcache_line_size = 16;
		curcpu()->ci_ci.icache_size = 0;
		curcpu()->ci_ci.icache_line_size = 16;
		break;
	case PVR_401F2:
		curcpu()->ci_ci.dcache_size = 2048;
		curcpu()->ci_ci.dcache_line_size = 16;
		curcpu()->ci_ci.icache_size = 2848;
		curcpu()->ci_ci.icache_line_size = 16;
		break;
	case PVR_401G2:
		curcpu()->ci_ci.dcache_size = 2848;
		curcpu()->ci_ci.dcache_line_size = 16;
		curcpu()->ci_ci.icache_size = 8192;
		curcpu()->ci_ci.icache_line_size = 16;
		break;
	case PVR_403:
		curcpu()->ci_ci.dcache_line_size = 16;
		curcpu()->ci_ci.icache_line_size = 16;
		break;
	case PVR_405GP:
		curcpu()->ci_ci.dcache_size = 8192;
		curcpu()->ci_ci.dcache_line_size = 32;
		curcpu()->ci_ci.icache_size = 8192;
		curcpu()->ci_ci.icache_line_size = 32;
		break;
	default:
		/*
		 * Unknown CPU type.  For safety we'll specify a
		 * cache with a 4-byte line size.  That way cache
		 * flush routines won't miss any lines.
		 */
		curcpu()->ci_ci.dcache_line_size = 4;
		curcpu()->ci_ci.icache_line_size = 4;
		break;
	}

}

/*
 * These small routines may have to be replaced,
 * if/when we support processors other that the 604.
 */

void
dcache_flush_page(vaddr_t va)
{
	int i;

	if (curcpu()->ci_ci.dcache_line_size)
		for (i = 0; i < NBPG; i += curcpu()->ci_ci.dcache_line_size)
			asm volatile("dcbf %0,%1" : : "r" (va), "r" (i));
	asm volatile("sync;isync" : : );
}

void
icache_flush_page(vaddr_t va)
{
	int i;

	if (curcpu()->ci_ci.icache_line_size)
		for (i = 0; i < NBPG; i += curcpu()->ci_ci.icache_line_size)
			asm volatile("icbi %0,%1" : : "r" (va), "r" (i));
	asm volatile("sync;isync" : : );
}

void
dcache_flush(vaddr_t va, vsize_t len)
{
	int i;

	if (len == 0)
		return;

	/* Make sure we flush all cache lines */
	len += va & (curcpu()->ci_ci.dcache_line_size-1);
	if (curcpu()->ci_ci.dcache_line_size)
		for (i = 0; i < len; i += curcpu()->ci_ci.dcache_line_size)
			asm volatile("dcbf %0,%1" : : "r" (va), "r" (i));
	asm volatile("sync;isync" : : );
}

void
icache_flush(vaddr_t va, vsize_t len)
{
	int i;

	if (len == 0)
		return;

	/* Make sure we flush all cache lines */
	len += va & (curcpu()->ci_ci.icache_line_size-1);
	if (curcpu()->ci_ci.icache_line_size)
		for (i = 0; i < len; i += curcpu()->ci_ci.icache_line_size)
			asm volatile("icbi %0,%1" : : "r" (va), "r" (i));
	asm volatile("sync;isync" : : );
}