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/* $OpenBSD: piix.c,v 1.9 2008/06/26 05:42:11 ray Exp $ */
/* $NetBSD: piix.c,v 1.1 1999/11/17 01:21:20 thorpej Exp $ */
/*-
* Copyright (c) 1999 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
* NASA Ames Research Center.
*
* 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.
*
* 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.
*/
/*
* 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.
*/
/*
* Support for the Intel PIIX PCI-ISA bridge interrupt controller.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <machine/intr.h>
#include <machine/bus.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcidevs.h>
#include <i386/pci/pcibiosvar.h>
#include <i386/pci/piixreg.h>
#include <i386/pci/piixvar.h>
#ifdef PIIX_DEBUG
#define DPRINTF(arg) printf arg
#else
#define DPRINTF(arg)
#endif
int piix_getclink(pciintr_icu_handle_t, int, int *);
int piix_get_intr(pciintr_icu_handle_t, int, int *);
int piix_set_intr(pciintr_icu_handle_t, int, int);
#ifdef PIIX_DEBUG
void piix_pir_dump(struct piix_handle *);
#endif
const struct pciintr_icu piix_pci_icu = {
piix_getclink,
piix_get_intr,
piix_set_intr,
piix_get_trigger,
piix_set_trigger,
};
int
piix_init(pci_chipset_tag_t pc, bus_space_tag_t iot, pcitag_t tag,
pciintr_icu_tag_t *ptagp, pciintr_icu_handle_t *phandp)
{
struct piix_handle *ph;
ph = malloc(sizeof(*ph), M_DEVBUF, M_NOWAIT);
if (ph == NULL)
return (1);
ph->ph_iot = iot;
ph->ph_pc = pc;
ph->ph_tag = tag;
if (bus_space_map(iot, PIIX_REG_ELCR, PIIX_REG_ELCR_SIZE, 0,
&ph->ph_elcr_ioh) != 0) {
free(ph, M_DEVBUF);
return (1);
}
#ifdef PIIX_DEBUG
piix_pir_dump(ph);
#endif
*ptagp = &piix_pci_icu;
*phandp = ph;
return (0);
}
int
piix_getclink(pciintr_icu_handle_t v, int link, int *clinkp)
{
DPRINTF(("PIIX link value 0x%x: ", link));
/* Pattern 1: simple. */
if (PIIX_LEGAL_LINK(link - 1)) {
*clinkp = link - 1;
DPRINTF(("PIRQ %d (simple)\n", *clinkp));
return (0);
}
/* Pattern 2: configuration register offset */
if (link >= 0x60 && link <= 0x63) {
*clinkp = link - 0x60;
DPRINTF(("PIRQ %d (register offset)\n", *clinkp));
return (0);
}
/* Pattern 3: configuration register offset, PIRQE# - PIRQH# */
if (link >= 0x68 && link <= 0x6b) {
*clinkp = link - 0x64;
DPRINTF(("PIRQ %d (high register offset)\n", *clinkp));
return (0);
}
DPRINTF(("bogus IRQ selection source\n"));
return (1);
}
int
piix_get_intr(pciintr_icu_handle_t v, int clink, int *irqp)
{
struct piix_handle *ph = v;
int shift, off;
pcireg_t reg;
if (PIIX_LEGAL_LINK(clink) == 0)
return (1);
off = PIIX_CFG_PIRQ;
if (clink > 3) {
off += 8;
clink -= 4;
}
reg = pci_conf_read(ph->ph_pc, ph->ph_tag, off);
shift = clink << 3;
if ((reg >> shift) & PIIX_CFG_PIRQ_NONE)
*irqp = I386_PCI_INTERRUPT_LINE_NO_CONNECTION;
else
*irqp = PIIX_PIRQ(reg, clink);
return (0);
}
int
piix_set_intr(pciintr_icu_handle_t v, int clink, int irq)
{
struct piix_handle *ph = v;
int shift, off;
pcireg_t reg;
if (PIIX_LEGAL_LINK(clink) == 0 || PIIX_LEGAL_IRQ(irq) == 0)
return (1);
off = PIIX_CFG_PIRQ;
if (clink > 3) {
off += 8;
clink -= 4;
}
reg = pci_conf_read(ph->ph_pc, ph->ph_tag, off);
shift = clink << 3;
reg &= ~((PIIX_CFG_PIRQ_NONE | PIIX_CFG_PIRQ_MASK) << shift);
reg |= irq << shift;
pci_conf_write(ph->ph_pc, ph->ph_tag, off, reg);
return (0);
}
int
piix_get_trigger(pciintr_icu_handle_t v, int irq, int *triggerp)
{
struct piix_handle *ph = v;
int off, bit;
u_int8_t elcr;
if (PIIX_LEGAL_IRQ(irq) == 0)
return (1);
off = (irq > 7) ? 1 : 0;
bit = irq & 7;
elcr = bus_space_read_1(ph->ph_iot, ph->ph_elcr_ioh, off);
if (elcr & (1 << bit))
*triggerp = IST_LEVEL;
else
*triggerp = IST_EDGE;
return (0);
}
int
piix_set_trigger(pciintr_icu_handle_t v, int irq, int trigger)
{
struct piix_handle *ph = v;
int off, bit;
u_int8_t elcr;
if (PIIX_LEGAL_IRQ(irq) == 0)
return (1);
off = (irq > 7) ? 1 : 0;
bit = irq & 7;
elcr = bus_space_read_1(ph->ph_iot, ph->ph_elcr_ioh, off);
if (trigger == IST_LEVEL)
elcr |= (1 << bit);
else
elcr &= ~(1 << bit);
bus_space_write_1(ph->ph_iot, ph->ph_elcr_ioh, off, elcr);
return (0);
}
#ifdef PIIX_DEBUG
void
piix_pir_dump(struct piix_handle *ph)
{
int i, irq;
pcireg_t irqs = pci_conf_read(ph->ph_pc, ph->ph_tag, PIIX_CFG_PIRQ);
u_int8_t elcr[2];
elcr[0] = bus_space_read_1(ph->ph_iot, ph->ph_elcr_ioh, 0);
elcr[1] = bus_space_read_1(ph->ph_iot, ph->ph_elcr_ioh, 1);
for (i = 0; i < 8; i++) {
if (i == 4)
irqs = pci_conf_read(ph->ph_pc, ph->ph_tag,
PIIX_CFG_PIRQH);
irq = PIIX_PIRQ(irqs, i);
if (irq & PIIX_CFG_PIRQ_NONE)
printf("PIIX PIRQ %d: irq none (0x%x)\n", i, irq);
else
printf("PIIX PIRQ %d: irq %d\n", i, irq);
}
printf("PIIX irq:");
for (i = 0; i < 16; i++)
printf(" %2d", i);
printf("\n");
printf(" trigger:");
for (i = 0; i < 16; i++)
printf(" %c", (elcr[(i & 8) ? 1 : 0] & (1 << (i & 7))) ?
'L' : 'E');
printf("\n");
}
#endif /* PIIX_DEBUG */
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