/*	$NetBSD: isa_machdep.c,v 1.14 2001/05/06 14:25:16 takemura Exp $	*/

/*
 * Copyright (c) 1999, by UCHIYAMA Yasushi
 * All rights reserved.
 *
 * 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. The name of the developer may NOT be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 THE AUTHOR OR CONTRIBUTORS 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/reboot.h>

#include <machine/bus.h>

#include <dev/isa/isavar.h>
#include <dev/isa/isareg.h>

#include <machine/platid.h>
#include <machine/platid_mask.h>

#include <dev/hpc/hpciovar.h>

#include <hpcmips/hpcmips/machdep.h>
#include "opt_vr41xx.h"
#include <hpcmips/vr/vrcpudef.h>
#include <hpcmips/vr/vripreg.h>
#include <hpcmips/vr/vripvar.h>

#include "locators.h"

#define VRISADEBUG

#ifdef VRISADEBUG
#ifndef VRISADEBUG_CONF
#define VRISADEBUG_CONF 0
#endif /* VRISADEBUG_CONF */
int vrisa_debug = VRISADEBUG_CONF;
#define DPRINTF(arg) if (vrisa_debug) printf arg;
#define DBITDISP32(mask) if (vrisa_debug) bitdisp32(mask);
#define VPRINTF(arg) if (bootverbose || vrisa_debug) printf arg;
#else /* VRISADEBUG */
#define DPRINTF(arg)
#define DBITDISP32(mask)
#define VPRINTF(arg) if (bootverbose) printf arg;
#endif /* VRISADEBUG */

/*
 * intrrupt no. encoding:
 *
 * 0x0000000f ISA IRQ#
 * 0x00ff0000 GPIO port#
 * 0x01000000 interrupt signal hold/through	(1:hold/0:though)
 * 0x02000000 interrupt detection level		(1:low /0:high	)
 * 0x04000000 interrupt detection trigger	(1:edge/0:level	)
 */
#define INTR_IRQ(i)	(((i)>> 0) & 0x0f)
#define INTR_PORT(i)	(((i)>>16) & 0xff)
#define INTR_MODE(i)	(((i)>>24) & 0x07)
#define INTR_NIRQS	16

int	vrisabprint __P((void*, const char*));
int	vrisabmatch __P((struct device*, struct cfdata*, void*));
void	vrisabattach __P((struct device*, struct device*, void*));

struct vrisab_softc {
	struct device sc_dev;
	hpcio_chip_t sc_hc;
	int sc_intr_map[INTR_NIRQS]; /* ISA <-> GIU inerrupt line mapping */
	struct hpcmips_isa_chipset sc_isa_ic;
};

struct cfattach vrisab_ca = {
	sizeof(struct vrisab_softc), vrisabmatch, vrisabattach
};

#ifdef DEBUG_FIND_PCIC
#include <mips/cpuregs.h>
#warning DEBUG_FIND_PCIC
static void __find_pcic __P((void));
#endif

#ifdef DEBUG_FIND_COMPORT
#include <mips/cpuregs.h>
#include <dev/ic/ns16550reg.h>
#include <dev/ic/comreg.h>
#warning DEBUG_FIND_COMPORT
static void __find_comport __P((void));
#endif


int
vrisabmatch(parent, match, aux)
	struct device *parent;
	struct cfdata *match;
	void *aux;
{
	struct hpcio_attach_args *haa = aux;
	platid_mask_t mask;
    
	if (strcmp(haa->haa_busname, match->cf_driver->cd_name))
		return 0;
	if (match->cf_loc[HPCIOIFCF_PLATFORM] == HPCIOIFCF_PLATFORM_DEFAULT) 
		return 1;
	mask = PLATID_DEREF(match->cf_loc[HPCIOIFCF_PLATFORM]);
	if (platid_match(&platid, &mask))
		return 2;
	return 0;
}

void
vrisabattach(parent, self, aux)
	struct device *parent;
	struct device *self;
	void *aux;
{
	struct hpcio_attach_args *haa = aux;
	struct vrisab_softc *sc = (void*)self;
	struct isabus_attach_args iba;
	bus_addr_t offset;
	int i;
    
	sc->sc_hc = (*haa->haa_getchip)(haa->haa_sc, VRIP_IOCHIP_VRGIU);
	sc->sc_isa_ic.ic_sc = sc;

	iba.iba_busname = "isa";
	iba.iba_ic	= &sc->sc_isa_ic;
	iba.iba_dmat    = 0; /* XXX not yet */

	/* Allocate ISA memory space */
	iba.iba_memt    = hpcmips_alloc_bus_space_tag();
	strcpy(iba.iba_memt->t_name, "ISA mem");
	offset = sc->sc_dev.dv_cfdata->cf_loc[VRISABIFCF_ISAMEMOFFSET];
	iba.iba_memt->t_base = VR_ISA_MEM_BASE + offset;
	iba.iba_memt->t_size = VR_ISA_MEM_SIZE - offset;
	hpcmips_init_bus_space_extent(iba.iba_memt);

	/* Allocate ISA port space */
	iba.iba_iot     = hpcmips_alloc_bus_space_tag();
	strcpy(iba.iba_iot->t_name, "ISA port");
	/* Platform dependent setting. */
	offset = sc->sc_dev.dv_cfdata->cf_loc[VRISABIFCF_ISAPORTOFFSET];
	iba.iba_iot->t_base = VR_ISA_PORT_BASE + offset;
	iba.iba_iot->t_size = VR_ISA_PORT_SIZE - offset;

	hpcmips_init_bus_space_extent(iba.iba_iot);

#ifdef DEBUG_FIND_PCIC
#warning DEBUG_FIND_PCIC
	__find_pcic();
#else
	/* Initialize ISA IRQ <-> GPIO mapping */
	for (i = 0; i < INTR_NIRQS; i++)
		sc->sc_intr_map[i] = -1;
	printf (":ISA port %#x-%#x mem %#x-%#x\n",
		iba.iba_iot->t_base, iba.iba_iot->t_base + iba.iba_iot->t_size,
		iba.iba_memt->t_base, iba.iba_memt->t_base + iba.iba_memt->t_size);
	config_found(self, &iba, vrisabprint);
#endif

#ifdef DEBUG_FIND_COMPORT
#warning DEBUG_FIND_COMPORT
	__find_comport();
#endif
}

int
vrisabprint(aux, pnp)
	void *aux;
	const char *pnp;
{
	if (pnp)
		return (QUIET);
	return (UNCONF);
}

void
isa_attach_hook(parent, self, iba)
	struct device *parent, *self;
	struct isabus_attach_args *iba;
{
}

const struct evcnt *
isa_intr_evcnt(isa_chipset_tag_t ic, int irq)
{

	/* XXX for now, no evcnt parent reported */
	return NULL;
}

void *
isa_intr_establish(ic, intr, type, level, ih_fun, ih_arg)
	isa_chipset_tag_t ic;
	int intr;
	int type;  /* XXX not yet */
	int level;  /* XXX not yet */
	int (*ih_fun) __P((void*));
	void *ih_arg;
{
	struct vrisab_softc *sc = ic->ic_sc;
	int port, irq, mode;

	static int intr_modes[8] = {
		HPCIO_INTR_LEVEL_HIGH_THROUGH,
		HPCIO_INTR_LEVEL_HIGH_HOLD,
		HPCIO_INTR_LEVEL_LOW_THROUGH,
		HPCIO_INTR_LEVEL_LOW_HOLD,
		HPCIO_INTR_EDGE_THROUGH,
		HPCIO_INTR_EDGE_HOLD,
		HPCIO_INTR_EDGE_THROUGH,
		HPCIO_INTR_EDGE_HOLD,
	};
#ifdef VRISADEBUG
	static char* intr_mode_names[8] = {
		"level high through",
		"level high hold",
		"level low through",
		"level low hold",
		"edge through",
		"edge hold",
		"edge through",
		"edge hold",
	};
#endif /* VRISADEBUG */
	/* 
	 * ISA IRQ <-> GPIO port mapping
	 */
	irq = INTR_IRQ(intr);
	if (sc->sc_intr_map[irq] != -1) {
		/* already mapped */
		intr = sc->sc_intr_map[irq];
	} else {
		/* not mapped yet */
		sc->sc_intr_map[irq] = intr; /* Register it */
	}
	mode = INTR_MODE(intr);
	port = INTR_PORT(intr);

	VPRINTF(("ISA IRQ %d -> %s port %d, %s\n",
	       irq, sc->sc_hc->hc_name, port, intr_mode_names[mode]));

	/* Call Vr routine */
	return hpcio_intr_establish(sc->sc_hc, port, intr_modes[mode],
				    ih_fun, ih_arg);
}

void
isa_intr_disestablish(ic, arg)
	isa_chipset_tag_t ic;
	void *arg;
{
	struct vrisab_softc *sc = ic->ic_sc;
	/* Call Vr routine */
	hpcio_intr_disestablish(sc->sc_hc, arg);
}

int
isa_intr_alloc(ic, mask, type, irq)
	isa_chipset_tag_t ic;
	int mask;
	int type;
	int *irq;
{
	/* XXX not coded yet. this is temporary XXX */
	DPRINTF(("isa_intr_alloc:"));
	DBITDISP32(mask);
	*irq = (ffs(mask) -1); /* XXX */
	return 0;
}


#ifdef DEBUG_FIND_PCIC
#warning DEBUG_FIND_PCIC
static void
__find_pcic(void)
{
	int i, j, step, found;
	u_int32_t addr;
	u_int8_t reg;
	int __read_revid (u_int32_t port) 
		{
			addr = MIPS_PHYS_TO_KSEG1(i + port);
			printf("%#x\r", i);
			for (found = 0, j = 0; j < 0x100; j += 0x40) {
				*((volatile u_int8_t*)addr) = j;
				reg = *((volatile u_int8_t*)(addr + 1));
#ifdef DEBUG_FIND_PCIC_I82365SL_ONLY
				if (reg == 0x82 || reg == 0x83) {
#else
				if ((reg & 0xc0) == 0x80) {
#endif
					found++;
				}
			}
			if (found)
				printf("\nfound %d socket at %#x (base from %#x)\n", found, addr,
				       i + port - VR_ISA_PORT_BASE);
		};
	step = 0x1000000;
	printf("\nFinding PCIC. Trying ISA port %#x-%#x step %#x\n", 
	       VR_ISA_PORT_BASE, VR_ISA_PORT_BASE + VR_ISA_PORT_SIZE, step);
	for (i = VR_ISA_PORT_BASE; i < VR_ISA_PORT_BASE+VR_ISA_PORT_SIZE; i+= step) {
		__read_revid (0x3e0);
		__read_revid (0x3e2);
	}
}
#endif


#ifdef DEBUG_FIND_COMPORT
#warning DEBUG_FIND_COMPORT

static int probe_com __P((u_int32_t));

static int  probe_com( port_addr )
	u_int32_t	port_addr;
{
	u_int32_t	addr;
	u_int8_t	ubtmp1;
	u_int8_t	ubtmp2;

	addr = MIPS_PHYS_TO_KSEG1( port_addr );

	*((volatile u_int8_t*)(addr + com_cfcr)) = LCR_8BITS;
	*((volatile u_int8_t*)(addr + com_iir)) = 0;

	ubtmp1 = *((volatile u_int8_t*)(addr + com_cfcr));
	ubtmp2 = *((volatile u_int8_t*)(addr + com_iir));

	if( (ubtmp1 != LCR_8BITS) || ((ubtmp2 & 0x38) != 0) ){
		return( 0 );
	}

	return( 1 );
}

static void
__find_comport(void)
{
	int	found;
	u_int32_t	port;
	u_int32_t	step;

	found = 0;
	step = 0x08;

	printf("Searching COM port. Trying ISA port %#x-%#x step %#x\n",
		   VR_ISA_PORT_BASE, VR_ISA_PORT_BASE + VR_ISA_PORT_SIZE - 1, step );

	for( port = VR_ISA_PORT_BASE ; port < (VR_ISA_PORT_BASE + VR_ISA_PORT_SIZE) ; port += step ){
		if( probe_com( port ) ){
			found++;
			printf("found %d at %#x\n",found,port);
		}
	}
}
#endif