path: root/sys/arch/amd64/pci/pci_machdep.c

/*	$OpenBSD: pci_machdep.c,v 1.31 2009/08/22 02:54:50 mk Exp $	*/
/*	$NetBSD: pci_machdep.c,v 1.3 2003/05/07 21:33:58 fvdl Exp $	*/

/*-
 * Copyright (c) 1997, 1998 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) 1996 Christopher G. Demetriou.  All rights reserved.
 * Copyright (c) 1994 Charles M. 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 M. 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.
 */

#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 <sys/extent.h>
#include <sys/malloc.h>

#include <uvm/uvm_extern.h>

#include <machine/bus.h>

#include <machine/pio.h>
#include <machine/intr.h>
#include <machine/biosvar.h>

#include <dev/isa/isareg.h>
#include <dev/isa/isavar.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcidevs.h>
#include <dev/pci/ppbreg.h>

#include "ioapic.h"

#if NIOAPIC > 0
#include <machine/i82093var.h>
#include <machine/mpbiosvar.h>
#endif

struct mutex pci_conf_lock = MUTEX_INITIALIZER(IPL_HIGH);

#define	PCI_CONF_LOCK()						\
do {									\
	mtx_enter(&pci_conf_lock);					\
} while (0)

#define	PCI_CONF_UNLOCK()						\
do {									\
	mtx_leave(&pci_conf_lock);					\
} while (0)

#define	PCI_MODE1_ENABLE	0x80000000UL
#define	PCI_MODE1_ADDRESS_REG	0x0cf8
#define	PCI_MODE1_DATA_REG	0x0cfc

/*
 * PCI doesn't have any special needs; just use the generic versions
 * of these functions.
 */
struct bus_dma_tag pci_bus_dma_tag = {
	NULL,			/* _may_bounce */
	_bus_dmamap_create,
	_bus_dmamap_destroy,
	_bus_dmamap_load,
	_bus_dmamap_load_mbuf,
	_bus_dmamap_load_uio,
	_bus_dmamap_load_raw,
	_bus_dmamap_unload,
	NULL,
	_bus_dmamem_alloc,
	_bus_dmamem_free,
	_bus_dmamem_map,
	_bus_dmamem_unmap,
	_bus_dmamem_mmap,
};

extern void amdgart_probe(struct pcibus_attach_args *);

void
pci_attach_hook(struct device *parent, struct device *self,
    struct pcibus_attach_args *pba)
{
#ifndef SMALL_KERNEL
	if (pba->pba_bus == 0)
		amdgart_probe(pba);
#endif /* !SMALL_KERNEL */
}

int
pci_bus_maxdevs(pci_chipset_tag_t pc, int busno)
{
	return (32);
}

pcitag_t
pci_make_tag(pci_chipset_tag_t pc, int bus, int device, int function)
{
	if (bus >= 256 || device >= 32 || function >= 8)
		panic("pci_make_tag: bad request");

	return (PCI_MODE1_ENABLE |
	    (bus << 16) | (device << 11) | (function << 8));
}

void
pci_decompose_tag(pci_chipset_tag_t pc, pcitag_t tag, int *bp, int *dp, int *fp)
{
	if (bp != NULL)
		*bp = (tag >> 16) & 0xff;
	if (dp != NULL)
		*dp = (tag >> 11) & 0x1f;
	if (fp != NULL)
		*fp = (tag >> 8) & 0x7;
}

pcireg_t
pci_conf_read(pci_chipset_tag_t pc, pcitag_t tag, int reg)
{
	pcireg_t data;

	PCI_CONF_LOCK();
	outl(PCI_MODE1_ADDRESS_REG, tag | reg);
	data = inl(PCI_MODE1_DATA_REG);
	outl(PCI_MODE1_ADDRESS_REG, 0);
	PCI_CONF_UNLOCK();

	return data;
}

void
pci_conf_write(pci_chipset_tag_t pc, pcitag_t tag, int reg, pcireg_t data)
{
	PCI_CONF_LOCK();
	outl(PCI_MODE1_ADDRESS_REG, tag | reg);
	outl(PCI_MODE1_DATA_REG, data);
	outl(PCI_MODE1_ADDRESS_REG, 0);
	PCI_CONF_UNLOCK();
}

int
pci_intr_map(struct pci_attach_args *pa, pci_intr_handle_t *ihp)
{
	int pin = pa->pa_rawintrpin;
	int line = pa->pa_intrline;
#if NIOAPIC > 0
	int bus, dev, func;
	int mppin;
#endif

	if (pin == 0) {
		/* No IRQ used. */
		goto bad;
	}

	if (pin > PCI_INTERRUPT_PIN_MAX) {
		printf("pci_intr_map: bad interrupt pin %d\n", pin);
		goto bad;
	}

	ihp->tag = pa->pa_tag;
	ihp->line = line;
	ihp->pin = pin;

#if NIOAPIC > 0
	pci_decompose_tag(pa->pa_pc, pa->pa_tag, &bus, &dev, &func);
	if (mp_busses != NULL) {
		mppin = (dev << 2)|(pin - 1);
		if (intr_find_mpmapping(bus, mppin, &ihp->line) == 0) {
			ihp->line |= line;
			return 0;
		}
		if (pa->pa_bridgetag) {
			int swizpin = PPB_INTERRUPT_SWIZZLE(pin, dev);
			if (pa->pa_bridgeih[swizpin - 1].line != -1) {
				ihp->line = pa->pa_bridgeih[swizpin - 1].line;
				ihp->line |= line;
				return 0;
			}
		}
		/*
		 * No explicit PCI mapping found. This is not fatal,
		 * we'll try the ISA (or possibly EISA) mappings next.
		 */
	}
#endif

	/*
	 * 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).
	 *
	 * 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.
	 */
	if (line == 0 || line == X86_PCI_INTERRUPT_LINE_NO_CONNECTION)
		goto bad;

	if (line >= NUM_LEGACY_IRQS) {
		printf("pci_intr_map: bad interrupt line %d\n", line);
		goto bad;
	}
	if (line == 2) {
		printf("pci_intr_map: changed line 2 to line 9\n");
		line = 9;
	}

#if NIOAPIC > 0
	if (mp_busses != NULL) {
		if (mp_isa_bus != NULL &&
		    intr_find_mpmapping(mp_isa_bus->mb_idx, line, &ihp->line) == 0) {
			ihp->line |= line;
			return 0;
		}
#if NEISA > 0
		if (mp_eisa_bus != NULL &&
		    intr_find_mpmapping(mp_eisa_bus->mb_idx, line, &ihp->line) == 0) {
			ihp->line |= line;
			return 0;
		}
#endif
		printf("pci_intr_map: bus %d dev %d func %d pin %d; line %d\n",
		    bus, dev, func, pin, line);
		printf("pci_intr_map: no MP mapping found\n");
	}
#endif

	return 0;

bad:
	ihp->line = -1;
	return 1;
}

const char *
pci_intr_string(pci_chipset_tag_t pc, pci_intr_handle_t ih)
{
	static char irqstr[64];

	if (ih.line == 0)
		panic("pci_intr_string: bogus handle 0x%x", ih.line);

#if NIOAPIC > 0
	if (ih.line & APIC_INT_VIA_APIC)
		snprintf(irqstr, sizeof(irqstr), "apic %d int %d (irq %d)",
		    APIC_IRQ_APIC(ih.line),
		    APIC_IRQ_PIN(ih.line),
		    pci_intr_line(pc, ih));
	else
		snprintf(irqstr, sizeof(irqstr), "irq %d",
		    pci_intr_line(pc, ih));
#else
	snprintf(irqstr, sizeof(irqstr), "irq %d", pci_intr_line(pc, ih));
#endif
	return (irqstr);
}

#include "acpiprt.h"
#if NACPIPRT > 0
void	acpiprt_route_interrupt(int bus, int dev, int pin);
#endif

void *
pci_intr_establish(pci_chipset_tag_t pc, pci_intr_handle_t ih, int level,
    int (*func)(void *), void *arg, const char *what)
{
	int pin, irq;
	int bus, dev;
	struct pic *pic;

	pci_decompose_tag(pc, ih.tag, &bus, &dev, NULL);
#if NACPIPRT > 0
	acpiprt_route_interrupt(bus, dev, ih.pin);
#endif

	pic = &i8259_pic;
	pin = irq = ih.line;

#if NIOAPIC > 0
	if (ih.line & APIC_INT_VIA_APIC) {
		pic = (struct pic *)ioapic_find(APIC_IRQ_APIC(ih.line));
		if (pic == NULL) {
			printf("pci_intr_establish: bad ioapic %d\n",
			    APIC_IRQ_APIC(ih.line));
			return NULL;
		}
		pin = APIC_IRQ_PIN(ih.line);
		irq = APIC_IRQ_LEGACY_IRQ(ih.line);
		if (irq < 0 || irq >= NUM_LEGACY_IRQS)
			irq = -1;
	}
#endif

	return intr_establish(irq, pic, pin, IST_LEVEL, level, func, arg, what);
}

void
pci_intr_disestablish(pci_chipset_tag_t pc, void *cookie)
{
	intr_disestablish(cookie);
}

struct extent *pciio_ex;
struct extent *pcimem_ex;

void
pci_init_extents(void)
{
	bios_memmap_t *bmp;
	u_int64_t size;

	if (pciio_ex == NULL) {
		/*
		 * We only have 64K of addressable I/O space.
		 * However, since BARs may contain garbage, we cover
		 * the full 32-bit address space defined by PCI of
		 * which we only make the first 64K available.
		 */
		pciio_ex = extent_create("pciio", 0, 0xffffffff, M_DEVBUF,
		    NULL, 0, EX_NOWAIT | EX_FILLED);
		if (pciio_ex == NULL)
			return;
		extent_free(pciio_ex, 0, 0x10000, M_NOWAIT);
	}

	if (pcimem_ex == NULL) {
		pcimem_ex = extent_create("pcimem", 0, 0xffffffff, M_DEVBUF,
		    NULL, 0, EX_NOWAIT);
		if (pcimem_ex == NULL)
			return;

		for (bmp = bios_memmap; bmp->type != BIOS_MAP_END; bmp++) {
			/*
			 * Ignore address space beyond 4G.
			 */
			if (bmp->addr >= 0x100000000ULL)
				continue;
			size = bmp->size;
			if (bmp->addr + size >= 0x100000000ULL)
				size = 0x100000000ULL - bmp->addr;

			/* Ignore zero-sized regions. */
			if (size == 0)
				continue;

			if (extent_alloc_region(pcimem_ex, bmp->addr, size,
			    EX_NOWAIT))
				printf("memory map conflict 0x%llx/0x%llx\n",
				    bmp->addr, bmp->size);
		}
	}
}