/* $NetBSD: gapspci_pci.c,v 1.17 2015/10/23 08:40:08 knakahara Exp $ */
/*-
* Copyright (c) 2001 Marcus Comstedt.
* Copyright (c) 2001 Jason R. Thorpe.
* 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. 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 by Marcus Comstedt.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
/*
* PCI configuraiton space implementation for the SEGA GAPS PCI bridge.
*/
#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
__KERNEL_RCSID(0, "$NetBSD: gapspci_pci.c,v 1.17 2015/10/23 08:40:08 knakahara Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/bus.h>
#include <machine/cpu.h>
#include <machine/sysasicvar.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
#include <dreamcast/dev/g2/gapspcivar.h>
void gaps_attach_hook(device_t, device_t,
struct pcibus_attach_args *);
int gaps_bus_maxdevs(void *, int);
pcitag_t gaps_make_tag(void *, int, int, int);
void gaps_decompose_tag(void *, pcitag_t, int *, int *, int *);
pcireg_t gaps_conf_read(void *, pcitag_t, int);
void gaps_conf_write(void *, pcitag_t, int, pcireg_t);
int gaps_intr_map(const struct pci_attach_args *, pci_intr_handle_t *);
const char *gaps_intr_string(void *, pci_intr_handle_t,
char *buf, size_t len);
void *gaps_intr_establish(void *, pci_intr_handle_t,
int, int (*)(void *), void *);
void gaps_intr_disestablish(void *, void *);
void
gaps_pci_init(struct gaps_softc *sc)
{
pci_chipset_tag_t pc = &sc->sc_pc;
memset(pc, 0, sizeof(*pc));
pc->pc_attach_hook = gaps_attach_hook;
pc->pc_bus_maxdevs = gaps_bus_maxdevs;
pc->pc_make_tag = gaps_make_tag;
pc->pc_decompose_tag = gaps_decompose_tag;
pc->pc_conf_read = gaps_conf_read;
pc->pc_conf_write = gaps_conf_write;
pc->pc_conf_v = sc;
pc->pc_intr_map = gaps_intr_map;
pc->pc_intr_string = gaps_intr_string;
pc->pc_intr_establish = gaps_intr_establish;
pc->pc_intr_disestablish = gaps_intr_disestablish;
if (bus_space_map(sc->sc_memt, 0x01001600, 0x100,
0, &sc->sc_pci_memh) != 0)
panic("gaps_pci_init: can't map PCI configuration space");
}
#define GAPS_PCITAG_MAGIC 0x022473
void
gaps_attach_hook(device_t parent, device_t pci, struct pcibus_attach_args *pba)
{
struct gaps_softc *sc = device_private(parent);
/*
* Now that we know there's a bus configured, go ahead and
* program the BAR on the device.
*/
pci_conf_write(&sc->sc_pc, GAPS_PCITAG_MAGIC,
PCI_MAPREG_START + 4, 0x01000000);
pci_conf_write(&sc->sc_pc, GAPS_PCITAG_MAGIC, PCI_COMMAND_STATUS_REG,
pci_conf_read(&sc->sc_pc, 0, PCI_COMMAND_STATUS_REG) |
PCI_COMMAND_MEM_ENABLE | PCI_COMMAND_MASTER_ENABLE);
}
int
gaps_bus_maxdevs(void *v, int bus)
{
return 1;
}
pcitag_t
gaps_make_tag(void *v, int bus, int dev, int func)
{
if (bus == 0 && dev == 0 && func == 0)
return GAPS_PCITAG_MAGIC;
return 0;
}
void
gaps_decompose_tag(void *v, pcitag_t tag, int *bp, int *dp, int *fp)
{
int b, d, f;
if (tag == GAPS_PCITAG_MAGIC)
b = d = f = 0;
else {
/*
* Invalid for GAPS. These values ensure that a valid
* tag cannot be built.
*/
b = 0xff;
d = 0x1f;
f = 0x7;
}
if (bp != NULL)
*bp = b;
if (dp != NULL)
*dp = d;
if (fp != NULL)
*fp = f;
}
pcireg_t
gaps_conf_read(void *v, pcitag_t tag, int reg)
{
struct gaps_softc *sc = v;
if (tag != GAPS_PCITAG_MAGIC)
return -1;
if ((unsigned int)reg >= PCI_CONF_SIZE)
return -1;
if (reg == (PCI_MAPREG_START + 4)) {
/*
* We fake the BAR -- just return the physical address
* to which the device is mapped.
*/
return 0x01001700;
}
return bus_space_read_4(sc->sc_memt, sc->sc_pci_memh, reg);
}
void
gaps_conf_write(void *v, pcitag_t tag, int reg, pcireg_t val)
{
struct gaps_softc *sc = v;
if (tag != GAPS_PCITAG_MAGIC)
return;
if ((unsigned int)reg >= PCI_CONF_SIZE)
return;
/* Disallow writing to the "BAR" ... it doesn't actually exist. */
if (reg == (PCI_MAPREG_START + 4) && val != 0x01000000)
return;
bus_space_write_4(sc->sc_memt, sc->sc_pci_memh, reg, val);
}
int
gaps_intr_map(const struct pci_attach_args *pa, pci_intr_handle_t *ihp)
{
*ihp = SYSASIC_EVENT_EXT;
return 0;
}
const char *
gaps_intr_string(void *v, pci_intr_handle_t ih,
char *buf, size_t len)
{
strlcpy(buf, sysasic_intr_string(SYSASIC_IRL11), len);
return buf;
}
void *
gaps_intr_establish(void *v, pci_intr_handle_t ih, int level,
int (*func)(void *), void *arg)
{
return sysasic_intr_establish(ih, level, SYSASIC_IRL11, func, arg);
}
void
gaps_intr_disestablish(void *v, void *ih)
{
return sysasic_intr_disestablish(ih);
}