xref: /src/sys/arch/prep/pci/pci_machdep.c

/*	$NetBSD: pci_machdep.c,v 1.3 2000/06/04 19:15:00 cgd Exp $	*/

/*
 * 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.
 *
 * 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.
 */

#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>

#define _PREP_BUS_DMA_PRIVATE
#include <machine/bus.h>
#include <machine/pio.h>
#include <machine/intr.h>

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

#define	PCI_MODE1_ENABLE	0x80000000UL
#define	PCI_MODE1_ADDRESS_REG	(PREP_BUS_SPACE_IO + 0xcf8)
#define	PCI_MODE1_DATA_REG	(PREP_BUS_SPACE_IO + 0xcfc)

/*
 * PCI constants.
 * XXX These should be in a common file!
 */
#define	PCI_CBIO	0x10

/*
 * PCI doesn't have any special needs; just use the generic versions
 * of these functions.
 */
struct prep_bus_dma_tag pci_bus_dma_tag = {
	0,			/* _bounce_thresh */
	_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,			/* _dmamap_sync */
	_bus_dmamem_alloc,
	_bus_dmamem_free,
	_bus_dmamem_map,
	_bus_dmamem_unmap,
	_bus_dmamem_mmap,
};

void
pci_attach_hook(parent, self, pba)
	struct device *parent, *self;
	struct pcibus_attach_args *pba;
{
	pci_chipset_tag_t pc;
	int bus, device, maxndevs, function, nfunctions;

	pc = pba->pba_pc;
	bus = pba->pba_bus;

	maxndevs = pci_bus_maxdevs(pba->pba_pc, pba->pba_bus);

	for (device = 0; device < maxndevs; device++) {
		pcitag_t tag;
		pcireg_t id, intr, bhlcr, csr, address;
		int line;

		tag = pci_make_tag(pc, bus, device, 0);
		id = pci_conf_read(pc, tag, PCI_ID_REG);

		/* Invalid vendor ID value? */
		if (PCI_VENDOR(id) == PCI_VENDOR_INVALID)
			continue;
		/* XXX Not invalid, but we've done this ~forever. */
		if (PCI_VENDOR(id) == 0)
			continue;

		bhlcr = pci_conf_read(pc, tag, PCI_BHLC_REG);
		if (PCI_HDRTYPE_MULTIFN(bhlcr))
			nfunctions = 8;
		else
			nfunctions = 1;

		for (function = 0; function < nfunctions; function++) {
			int i;

			tag = pci_make_tag(pc, bus, device, function);
			id = pci_conf_read(pc, tag, PCI_ID_REG);

			/* Invalid vendor ID value? */
			if (PCI_VENDOR(id) == PCI_VENDOR_INVALID)
                                continue;
			/* XXX Not invalid, but we've done this ~forever. */
			if (PCI_VENDOR(id) == 0)
				continue;

			/* Enable io/mem */
			/* XXX: ibm_machdep : ppc830 depend */
			switch (device) {
			case 12:
			case 18:
			case 22:
				csr = pci_conf_read(pc, tag, PCI_COMMAND_STATUS_REG);
				csr |= (PCI_COMMAND_IO_ENABLE|PCI_COMMAND_MEM_ENABLE);
				pci_conf_write(pc, tag, PCI_COMMAND_STATUS_REG, csr);
				break;
			}

			/* Fixup insane address */
			for (i = 0; i < 6; i ++) {
			address = pci_conf_read(pc, tag, PCI_CBIO + i * 4);
				if (address > 0x10000000) {
					address &= 0x00ffffff;
					address |= 0x01000000;
					pci_conf_write(pc, tag, PCI_CBIO + i * 4, address);
				}
			}

			/* Fixup intr */
			/* XXX: ibm_machdep : ppc830 depend */
			switch (device) {
			case 12:
			case 18:
			case 22:
				line = 15;
				break;
			default:
				line = 0;
				break;
			}

			if (line) {
				intr = pci_conf_read(pc, tag, PCI_INTERRUPT_REG);
				pci_conf_write(pc, tag, PCI_INTERRUPT_REG,
				    (intr & ~0xff) | line);
			}
		}
	}
}

int
pci_bus_maxdevs(pc, busno)
	pci_chipset_tag_t pc;
	int busno;
{

	/*
	 * Bus number is irrelevant.  Configuration Mechanism 1 is in
	 * use, can have devices 0-32 (i.e. the `normal' range).
	 */
	return (32);
}

pcitag_t
pci_make_tag(pc, bus, device, function)
	pci_chipset_tag_t pc;
	int bus, device, function;
{
	pcitag_t tag;

	if (bus >= 256 || device >= 32 || function >= 8)
		panic("pci_make_tag: bad request");

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

void
pci_decompose_tag(pc, tag, bp, dp, fp)
	pci_chipset_tag_t pc;
	pcitag_t tag;
	int *bp, *dp, *fp;
{

	if (bp != NULL)
		*bp = (tag >> 16) & 0xff;
	if (dp != NULL)
		*dp = (tag >> 11) & 0x1f;
	if (fp != NULL)
		*fp = (tag >> 8) & 0x7;
	return;
}

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

	out32rb(PCI_MODE1_ADDRESS_REG, tag | reg);
	data = in32rb(PCI_MODE1_DATA_REG);
	out32rb(PCI_MODE1_ADDRESS_REG, 0);
	return data;
}

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

	out32rb(PCI_MODE1_ADDRESS_REG, tag | reg);
	out32rb(PCI_MODE1_DATA_REG, data);
	out32rb(PCI_MODE1_ADDRESS_REG, 0);
}

int
pci_intr_map(pc, intrtag, pin, line, ihp)
	pci_chipset_tag_t pc;
	pcitag_t intrtag;
	int pin, line;
	pci_intr_handle_t *ihp;
{

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

	if (pin > 4) {
		printf("pci_intr_map: bad interrupt pin %d\n", pin);
		goto bad;
	}

	/*
	* 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 == 255) {
		printf("pci_intr_map: no mapping for pin %c\n", '@' + pin);
		goto bad;
	} else {
		if (line >= ICU_LEN) {
			printf("pci_intr_map: bad interrupt line %d\n", line);
			goto bad;
		}
		if (line == IRQ_SLAVE) {
			printf("pci_intr_map: changed line 2 to line 9\n");
			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 == IRQ_SLAVE)
		panic("pci_intr_string: bogus handle 0x%x\n", ih);

	sprintf(irqstr, "irq %d", ih);
	return (irqstr);

}

const struct evcnt *
pci_intr_evcnt(pc, ih)
	pci_chipset_tag_t pc;
	pci_intr_handle_t ih;
{

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

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 == IRQ_SLAVE)
		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;
{

	return isa_intr_disestablish(NULL, cookie);
}