NetBSD/sys/arch/i386/pci/pci_machdep.c

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/* $NetBSD: pci_machdep.c,v 1.26 1996/10/24 12:32:29 fvdl Exp $ */
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/*
* Copyright (c) 1996 Christopher G. Demetriou. All rights reserved.
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* Copyright (c) 1994 Charles Hannum. 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 Charles Hannum.
* 4. The name of the author 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 ``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 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.
*/
/*
* Machine-specific functions for PCI autoconfiguration.
*
* On PCs, there are two methods of generating PCI configuration cycles.
* We try to detect the appropriate mechanism for this machine and set
* up a few function pointers to access the correct method directly.
*
* The configuration method can be hard-coded in the config file by
* using `options PCI_CONF_MODE=N', where `N' is the configuration mode
* as defined section 3.6.4.1, `Generating Configuration Cycles'.
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/time.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/device.h>
#include <vm/vm.h>
#include <vm/vm_kern.h>
#include <machine/pio.h>
#include <i386/isa/icu.h>
#include <dev/isa/isavar.h>
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#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
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int pci_mode = -1;
#define PCI_MODE1_ENABLE 0x80000000UL
#define PCI_MODE1_ADDRESS_REG 0x0cf8
#define PCI_MODE1_DATA_REG 0x0cfc
#define PCI_MODE2_ENABLE_REG 0x0cf8
#define PCI_MODE2_FORWARD_REG 0x0cfa
void
pci_attach_hook(parent, self, pba)
struct device *parent, *self;
struct pcibus_attach_args *pba;
{
if (pba->pba_bus == 0)
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printf(": configuration mode %d", pci_mode);
}
int
pci_bus_maxdevs(pc, busno)
pci_chipset_tag_t pc;
int busno;
{
/*
* Bus number is irrelevant. If Configuration Mechanism 2 is in
* use, can only have devices 0-15 on any bus. If Configuration
* Mechanism 1 is in use, can have devices 0-32 (i.e. the `normal'
* range).
*/
if (pci_mode == 2)
return (16);
else
return (32);
}
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pcitag_t
pci_make_tag(pc, bus, device, function)
pci_chipset_tag_t pc;
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int bus, device, function;
{
pcitag_t tag;
#ifndef PCI_CONF_MODE
switch (pci_mode) {
case 1:
goto mode1;
case 2:
goto mode2;
default:
panic("pci_make_tag: mode not configured");
}
#endif
#if !defined(PCI_CONF_MODE) || (PCI_CONF_MODE == 1)
#ifndef PCI_CONF_MODE
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mode1:
#endif
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if (bus >= 256 || device >= 32 || function >= 8)
panic("pci_make_tag: bad request");
tag.mode1 = PCI_MODE1_ENABLE |
(bus << 16) | (device << 11) | (function << 8);
return tag;
#endif
#if !defined(PCI_CONF_MODE) || (PCI_CONF_MODE == 2)
#ifndef PCI_CONF_MODE
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mode2:
#endif
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if (bus >= 256 || device >= 16 || function >= 8)
panic("pci_make_tag: bad request");
tag.mode2.port = 0xc000 | (device << 8);
tag.mode2.enable = 0xf0 | (function << 1);
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tag.mode2.forward = bus;
return tag;
#endif
}
pcireg_t
pci_conf_read(pc, tag, reg)
pci_chipset_tag_t pc;
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pcitag_t tag;
int reg;
{
pcireg_t data;
#ifndef PCI_CONF_MODE
switch (pci_mode) {
case 1:
goto mode1;
case 2:
goto mode2;
default:
panic("pci_conf_read: mode not configured");
}
#endif
#if !defined(PCI_CONF_MODE) || (PCI_CONF_MODE == 1)
#ifndef PCI_CONF_MODE
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mode1:
#endif
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outl(PCI_MODE1_ADDRESS_REG, tag.mode1 | reg);
data = inl(PCI_MODE1_DATA_REG);
outl(PCI_MODE1_ADDRESS_REG, 0);
return data;
#endif
#if !defined(PCI_CONF_MODE) || (PCI_CONF_MODE == 2)
#ifndef PCI_CONF_MODE
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mode2:
#endif
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outb(PCI_MODE2_ENABLE_REG, tag.mode2.enable);
outb(PCI_MODE2_FORWARD_REG, tag.mode2.forward);
data = inl(tag.mode2.port | reg);
outb(PCI_MODE2_ENABLE_REG, 0);
return data;
#endif
}
void
pci_conf_write(pc, tag, reg, data)
pci_chipset_tag_t pc;
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pcitag_t tag;
int reg;
pcireg_t data;
{
#ifndef PCI_CONF_MODE
switch (pci_mode) {
case 1:
goto mode1;
case 2:
goto mode2;
default:
panic("pci_conf_write: mode not configured");
}
#endif
#if !defined(PCI_CONF_MODE) || (PCI_CONF_MODE == 1)
#ifndef PCI_CONF_MODE
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mode1:
#endif
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outl(PCI_MODE1_ADDRESS_REG, tag.mode1 | reg);
outl(PCI_MODE1_DATA_REG, data);
outl(PCI_MODE1_ADDRESS_REG, 0);
#endif
#if !defined(PCI_CONF_MODE) || (PCI_CONF_MODE == 2)
#ifndef PCI_CONF_MODE
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mode2:
#endif
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outb(PCI_MODE2_ENABLE_REG, tag.mode2.enable);
outb(PCI_MODE2_FORWARD_REG, tag.mode2.forward);
outl(tag.mode2.port | reg, data);
outb(PCI_MODE2_ENABLE_REG, 0);
#endif
}
int
pci_mode_detect()
{
#ifdef PCI_CONF_MODE
#if (PCI_CONF_MODE == 1) || (PCI_CONF_MODE == 2)
return (pci_mode = PCI_CONF_MODE);
#else
#error Invalid PCI configuration mode.
#endif
#else
if (pci_mode != -1)
return pci_mode;
/*
* We try to divine which configuration mode the host bridge wants. We
* try mode 2 first, because our probe for mode 1 is likely to succeed
* for mode 2 also.
*
* XXX
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* This should really be done using the PCI BIOS.
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*/
outb(PCI_MODE2_ENABLE_REG, 0);
outb(PCI_MODE2_FORWARD_REG, 0);
if (inb(PCI_MODE2_ENABLE_REG) != 0 ||
inb(PCI_MODE2_FORWARD_REG) != 0)
goto not2;
return (pci_mode = 2);
not2:
outl(PCI_MODE1_ADDRESS_REG, PCI_MODE1_ENABLE);
if (inl(PCI_MODE1_ADDRESS_REG) != PCI_MODE1_ENABLE)
goto not1;
outl(PCI_MODE1_ADDRESS_REG, 0);
if (inl(PCI_MODE1_ADDRESS_REG) != 0)
goto not1;
return (pci_mode = 1);
not1:
return (pci_mode = 0);
#endif
}
int
pci_intr_map(pc, intrtag, pin, line, ihp)
pci_chipset_tag_t pc;
pcitag_t intrtag;
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int pin, line;
pci_intr_handle_t *ihp;
{
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if (pin == 0) {
/* No IRQ used. */
goto bad;
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}
if (pin > 4) {
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printf("pci_intr_map: bad interrupt pin %d\n", pin);
goto bad;
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}
/*
* Section 6.2.4, `Miscellaneous Functions', says that 255 means
* `unknown' or `no connection' on a PC. We assume that a device with
* `no connection' either doesn't have an interrupt (in which case the
* pin number should be 0, and would have been noticed above), or
* wasn't configured by the BIOS (in which case we punt, since there's
* no real way we can know how the interrupt lines are mapped in the
* hardware).
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*
* XXX
* Since IRQ 0 is only used by the clock, and we can't actually be sure
* that the BIOS did its job, we also recognize that as meaning that
* the BIOS has not configured the device.
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*/
if (line == 0 || line == 255) {
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printf("pci_intr_map: no mapping for pin %c\n", '@' + pin);
goto bad;
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} else {
if (line >= ICU_LEN) {
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printf("pci_intr_map: bad interrupt line %d\n", line);
goto bad;
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}
if (line == 2) {
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printf("pci_intr_map: changed line 2 to line 9\n");
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line = 9;
}
}
*ihp = line;
return 0;
bad:
*ihp = -1;
return 1;
}
const char *
pci_intr_string(pc, ih)
pci_chipset_tag_t pc;
pci_intr_handle_t ih;
{
static char irqstr[8]; /* 4 + 2 + NULL + sanity */
if (ih == 0 || ih >= ICU_LEN || ih == 2)
panic("pci_intr_string: bogus handle 0x%x\n", ih);
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sprintf(irqstr, "irq %d", ih);
return (irqstr);
}
void *
pci_intr_establish(pc, ih, level, func, arg)
pci_chipset_tag_t pc;
pci_intr_handle_t ih;
int level, (*func) __P((void *));
void *arg;
{
if (ih == 0 || ih >= ICU_LEN || ih == 2)
panic("pci_intr_establish: bogus handle 0x%x\n", ih);
return isa_intr_establish(NULL, ih, IST_LEVEL, level, func, arg);
}
void
pci_intr_disestablish(pc, cookie)
pci_chipset_tag_t pc;
void *cookie;
{
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return isa_intr_disestablish(NULL, cookie);
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}