pci_common.c

来自「LINUX 2.6.17.4的源码」· C语言 代码 · 共 1,088 行 · 第 1/2 页

					   struct pci_dev *toplevel_pdev,
					   struct pci_dev *pdev,
					   unsigned int interrupt)
{
	unsigned int ret;

	if (unlikely(interrupt < 1 || interrupt > 4)) {
		printk("%s: Device %s interrupt value of %u is strange.\n",
		       pbm->name, pci_name(pdev), interrupt);
		return interrupt;
	}

	ret = ((interrupt - 1 + (PCI_SLOT(pdev->devfn) & 3)) & 3) + 1;

	printk("%s: %s IRQ Swivel %s [%x:%x] -> [%x]\n",
	       pbm->name, pci_name(toplevel_pdev), pci_name(pdev),
	       interrupt, PCI_SLOT(pdev->devfn), ret);

	return ret;
}

static inline unsigned int pci_apply_intmap(struct pci_pbm_info *pbm,
					    struct pci_dev *toplevel_pdev,
					    struct pci_dev *pbus,
					    struct pci_dev *pdev,
					    unsigned int interrupt,
					    unsigned int *cnode)
{
	struct linux_prom_pci_intmap imap[PROM_PCIIMAP_MAX];
	struct linux_prom_pci_intmask imask;
	struct pcidev_cookie *pbus_pcp = pbus->sysdata;
	struct pcidev_cookie *pdev_pcp = pdev->sysdata;
	struct linux_prom_pci_registers *pregs = pdev_pcp->prom_regs;
	int plen, num_imap, i;
	unsigned int hi, mid, lo, irq, orig_interrupt;

	*cnode = pbus_pcp->prom_node;

	plen = prom_getproperty(pbus_pcp->prom_node, "interrupt-map",
				(char *) &imap[0], sizeof(imap));
	if (plen <= 0 ||
	    (plen % sizeof(struct linux_prom_pci_intmap)) != 0) {
		printk("%s: Device %s interrupt-map has bad len %d\n",
		       pbm->name, pci_name(pbus), plen);
		goto no_intmap;
	}
	num_imap = plen / sizeof(struct linux_prom_pci_intmap);

	plen = prom_getproperty(pbus_pcp->prom_node, "interrupt-map-mask",
				(char *) &imask, sizeof(imask));
	if (plen <= 0 ||
	    (plen % sizeof(struct linux_prom_pci_intmask)) != 0) {
		printk("%s: Device %s interrupt-map-mask has bad len %d\n",
		       pbm->name, pci_name(pbus), plen);
		goto no_intmap;
	}

	orig_interrupt = interrupt;

	hi   = pregs->phys_hi & imask.phys_hi;
	mid  = pregs->phys_mid & imask.phys_mid;
	lo   = pregs->phys_lo & imask.phys_lo;
	irq  = interrupt & imask.interrupt;

	for (i = 0; i < num_imap; i++) {
		if (imap[i].phys_hi  == hi   &&
		    imap[i].phys_mid == mid  &&
		    imap[i].phys_lo  == lo   &&
		    imap[i].interrupt == irq) {
			*cnode = imap[i].cnode;
			interrupt = imap[i].cinterrupt;
		}
	}

	printk("%s: %s MAP BUS %s DEV %s [%x] -> [%x]\n",
	       pbm->name, pci_name(toplevel_pdev),
	       pci_name(pbus), pci_name(pdev),
	       orig_interrupt, interrupt);

no_intmap:
	return interrupt;
}

/* For each PCI bus on the way to the root:
 * 1) If it has an interrupt-map property, apply it.
 * 2) Else, swivel the interrupt number based upon the PCI device number.
 *
 * Return the "IRQ controller" node.  If this is the PBM's device node,
 * all interrupt translations are complete, else we should use that node's
 * "reg" property to apply the PBM's "interrupt-{map,mask}" to the interrupt.
 */
static unsigned int __init pci_intmap_match_to_root(struct pci_pbm_info *pbm,
						    struct pci_dev *pdev,
						    unsigned int *interrupt)
{
	struct pci_dev *toplevel_pdev = pdev;
	struct pcidev_cookie *toplevel_pcp = toplevel_pdev->sysdata;
	unsigned int cnode = toplevel_pcp->prom_node;

	while (pdev->bus->number != pbm->pci_first_busno) {
		struct pci_dev *pbus = pdev->bus->self;
		struct pcidev_cookie *pcp = pbus->sysdata;
		int plen;

		plen = prom_getproplen(pcp->prom_node, "interrupt-map");
		if (plen <= 0) {
			*interrupt = pci_slot_swivel(pbm, toplevel_pdev,
						     pdev, *interrupt);
			cnode = pcp->prom_node;
		} else {
			*interrupt = pci_apply_intmap(pbm, toplevel_pdev,
						      pbus, pdev,
						      *interrupt, &cnode);

			while (pcp->prom_node != cnode &&
			       pbus->bus->number != pbm->pci_first_busno) {
				pbus = pbus->bus->self;
				pcp = pbus->sysdata;
			}
		}
		pdev = pbus;

		if (cnode == pbm->prom_node)
			break;
	}

	return cnode;
}

static int __init pci_intmap_match(struct pci_dev *pdev, unsigned int *interrupt)
{
	struct pcidev_cookie *dev_pcp = pdev->sysdata;
	struct pci_pbm_info *pbm = dev_pcp->pbm;
	struct linux_prom_pci_registers reg[PROMREG_MAX];
	unsigned int hi, mid, lo, irq;
	int i, cnode, plen;

	cnode = pci_intmap_match_to_root(pbm, pdev, interrupt);
	if (cnode == pbm->prom_node)
		goto success;

	plen = prom_getproperty(cnode, "reg", (char *) reg, sizeof(reg));
	if (plen <= 0 ||
	    (plen % sizeof(struct linux_prom_pci_registers)) != 0) {
		printk("%s: OBP node %x reg property has bad len %d\n",
		       pbm->name, cnode, plen);
		goto fail;
	}

	hi   = reg[0].phys_hi & pbm->pbm_intmask.phys_hi;
	mid  = reg[0].phys_mid & pbm->pbm_intmask.phys_mid;
	lo   = reg[0].phys_lo & pbm->pbm_intmask.phys_lo;
	irq  = *interrupt & pbm->pbm_intmask.interrupt;

	for (i = 0; i < pbm->num_pbm_intmap; i++) {
		struct linux_prom_pci_intmap *intmap;

		intmap = &pbm->pbm_intmap[i];

		if (intmap->phys_hi  == hi  &&
		    intmap->phys_mid == mid &&
		    intmap->phys_lo  == lo  &&
		    intmap->interrupt == irq) {
			*interrupt = intmap->cinterrupt;
			goto success;
		}
	}

fail:
	return 0;

success:
	printk("PCI-IRQ: Routing bus[%2x] slot[%2x] to INO[%02x]\n",
	       pdev->bus->number, PCI_SLOT(pdev->devfn),
	       *interrupt);
	return 1;
}

static void __init pdev_fixup_irq(struct pci_dev *pdev)
{
	struct pcidev_cookie *pcp = pdev->sysdata;
	struct pci_pbm_info *pbm = pcp->pbm;
	struct pci_controller_info *p = pbm->parent;
	unsigned int portid = pbm->portid;
	unsigned int prom_irq;
	int prom_node = pcp->prom_node;
	int err;

	/* If this is an empty EBUS device, sometimes OBP fails to
	 * give it a valid fully specified interrupts property.
	 * The EBUS hooked up to SunHME on PCI I/O boards of
	 * Ex000 systems is one such case.
	 *
	 * The interrupt is not important so just ignore it.
	 */
	if (pdev->vendor == PCI_VENDOR_ID_SUN &&
	    pdev->device == PCI_DEVICE_ID_SUN_EBUS &&
	    !prom_getchild(prom_node)) {
		pdev->irq = 0;
		return;
	}

	err = prom_getproperty(prom_node, "interrupts",
			       (char *)&prom_irq, sizeof(prom_irq));
	if (err == 0 || err == -1) {
		pdev->irq = 0;
		return;
	}

	if (tlb_type != hypervisor) {
		/* Fully specified already? */
		if (((prom_irq & PCI_IRQ_IGN) >> 6) == portid) {
			pdev->irq = p->irq_build(pbm, pdev, prom_irq);
			goto have_irq;
		}

		/* An onboard device? (bit 5 set) */
		if ((prom_irq & PCI_IRQ_INO) & 0x20) {
			pdev->irq = p->irq_build(pbm, pdev, (portid << 6 | prom_irq));
			goto have_irq;
		}
	}

	/* Can we find a matching entry in the interrupt-map? */
	if (pci_intmap_match(pdev, &prom_irq)) {
		pdev->irq = p->irq_build(pbm, pdev, (portid << 6) | prom_irq);
		goto have_irq;
	}

	/* Ok, we have to do it the hard way. */
	{
		unsigned int bus, slot, line;

		bus = (pbm == &pbm->parent->pbm_B) ? (1 << 4) : 0;

		/* If we have a legal interrupt property, use it as
		 * the IRQ line.
		 */
		if (prom_irq > 0 && prom_irq < 5) {
			line = ((prom_irq - 1) & 3);
		} else {
			u8 pci_irq_line;

			/* Else just directly consult PCI config space. */
			pci_read_config_byte(pdev, PCI_INTERRUPT_PIN, &pci_irq_line);
			line = ((pci_irq_line - 1) & 3);
		}

		/* Now figure out the slot.
		 *
		 * Basically, device number zero on the top-level bus is
		 * always the PCI host controller.  Slot 0 is then device 1.
		 * PBM A supports two external slots (0 and 1), and PBM B
		 * supports 4 external slots (0, 1, 2, and 3).  On-board PCI
		 * devices are wired to device numbers outside of these
		 * ranges. -DaveM
 		 */
		if (pdev->bus->number == pbm->pci_first_busno) {
			slot = PCI_SLOT(pdev->devfn) - pbm->pci_first_slot;
		} else {
			struct pci_dev *bus_dev;

			/* Underneath a bridge, use slot number of parent
			 * bridge which is closest to the PBM.
			 */
			bus_dev = pdev->bus->self;
			while (bus_dev->bus &&
			       bus_dev->bus->number != pbm->pci_first_busno)
				bus_dev = bus_dev->bus->self;

			slot = PCI_SLOT(bus_dev->devfn) - pbm->pci_first_slot;
		}
		slot = slot << 2;

		pdev->irq = p->irq_build(pbm, pdev,
					 ((portid << 6) & PCI_IRQ_IGN) |
					 (bus | slot | line));
	}

have_irq:
	pci_write_config_byte(pdev, PCI_INTERRUPT_LINE,
			      pdev->irq & PCI_IRQ_INO);
}

void __init pci_fixup_irq(struct pci_pbm_info *pbm,
			  struct pci_bus *pbus)
{
	struct pci_dev *dev;
	struct pci_bus *bus;

	list_for_each_entry(dev, &pbus->devices, bus_list)
		pdev_fixup_irq(dev);

	list_for_each_entry(bus, &pbus->children, node)
		pci_fixup_irq(pbm, bus);
}

static void pdev_setup_busmastering(struct pci_dev *pdev, int is_66mhz)
{
	u16 cmd;
	u8 hdr_type, min_gnt, ltimer;

	pci_read_config_word(pdev, PCI_COMMAND, &cmd);
	cmd |= PCI_COMMAND_MASTER;
	pci_write_config_word(pdev, PCI_COMMAND, cmd);

	/* Read it back, if the mastering bit did not
	 * get set, the device does not support bus
	 * mastering so we have nothing to do here.
	 */
	pci_read_config_word(pdev, PCI_COMMAND, &cmd);
	if ((cmd & PCI_COMMAND_MASTER) == 0)
		return;

	/* Set correct cache line size, 64-byte on all
	 * Sparc64 PCI systems.  Note that the value is
	 * measured in 32-bit words.
	 */
	pci_write_config_byte(pdev, PCI_CACHE_LINE_SIZE,
			      64 / sizeof(u32));

	pci_read_config_byte(pdev, PCI_HEADER_TYPE, &hdr_type);
	hdr_type &= ~0x80;
	if (hdr_type != PCI_HEADER_TYPE_NORMAL)
		return;

	/* If the latency timer is already programmed with a non-zero
	 * value, assume whoever set it (OBP or whoever) knows what
	 * they are doing.
	 */
	pci_read_config_byte(pdev, PCI_LATENCY_TIMER, &ltimer);
	if (ltimer != 0)
		return;

	/* XXX Since I'm tipping off the min grant value to
	 * XXX choose a suitable latency timer value, I also
	 * XXX considered making use of the max latency value
	 * XXX as well.  Unfortunately I've seen too many bogusly
	 * XXX low settings for it to the point where it lacks
	 * XXX any usefulness.  In one case, an ethernet card
	 * XXX claimed a min grant of 10 and a max latency of 5.
	 * XXX Now, if I had two such cards on the same bus I
	 * XXX could not set the desired burst period (calculated
	 * XXX from min grant) without violating the max latency
	 * XXX bound.  Duh...
	 * XXX
	 * XXX I blame dumb PC bios implementors for stuff like
	 * XXX this, most of them don't even try to do something
	 * XXX sensible with latency timer values and just set some
	 * XXX default value (usually 32) into every device.
	 */

	pci_read_config_byte(pdev, PCI_MIN_GNT, &min_gnt);

	if (min_gnt == 0) {
		/* If no min_gnt setting then use a default
		 * value.
		 */
		if (is_66mhz)
			ltimer = 16;
		else
			ltimer = 32;
	} else {
		int shift_factor;

		if (is_66mhz)
			shift_factor = 2;
		else
			shift_factor = 3;

		/* Use a default value when the min_gnt value
		 * is erroneously high.
		 */
		if (((unsigned int) min_gnt << shift_factor) > 512 ||
		    ((min_gnt << shift_factor) & 0xff) == 0) {
			ltimer = 8 << shift_factor;
		} else {
			ltimer = min_gnt << shift_factor;
		}
	}

	pci_write_config_byte(pdev, PCI_LATENCY_TIMER, ltimer);
}

void pci_determine_66mhz_disposition(struct pci_pbm_info *pbm,
				     struct pci_bus *pbus)
{
	struct pci_dev *pdev;
	int all_are_66mhz;
	u16 status;

	if (pbm->is_66mhz_capable == 0) {
		all_are_66mhz = 0;
		goto out;
	}

	all_are_66mhz = 1;
	list_for_each_entry(pdev, &pbus->devices, bus_list) {
		pci_read_config_word(pdev, PCI_STATUS, &status);
		if (!(status & PCI_STATUS_66MHZ)) {
			all_are_66mhz = 0;
			break;
		}
	}
out:
	pbm->all_devs_66mhz = all_are_66mhz;

	printk("PCI%d(PBM%c): Bus running at %dMHz\n",
	       pbm->parent->index,
	       (pbm == &pbm->parent->pbm_A) ? 'A' : 'B',
	       (all_are_66mhz ? 66 : 33));
}

void pci_setup_busmastering(struct pci_pbm_info *pbm,
			    struct pci_bus *pbus)
{
	struct pci_dev *dev;
	struct pci_bus *bus;
	int is_66mhz;

	is_66mhz = pbm->is_66mhz_capable && pbm->all_devs_66mhz;

	list_for_each_entry(dev, &pbus->devices, bus_list)
		pdev_setup_busmastering(dev, is_66mhz);

	list_for_each_entry(bus, &pbus->children, node)
		pci_setup_busmastering(pbm, bus);
}

void pci_register_legacy_regions(struct resource *io_res,
				 struct resource *mem_res)
{
	struct resource *p;

	/* VGA Video RAM. */
	p = kzalloc(sizeof(*p), GFP_KERNEL);
	if (!p)
		return;

	p->name = "Video RAM area";
	p->start = mem_res->start + 0xa0000UL;
	p->end = p->start + 0x1ffffUL;
	p->flags = IORESOURCE_BUSY;
	request_resource(mem_res, p);

	p = kzalloc(sizeof(*p), GFP_KERNEL);
	if (!p)
		return;

	p->name = "System ROM";
	p->start = mem_res->start + 0xf0000UL;
	p->end = p->start + 0xffffUL;
	p->flags = IORESOURCE_BUSY;
	request_resource(mem_res, p);

	p = kzalloc(sizeof(*p), GFP_KERNEL);
	if (!p)
		return;

	p->name = "Video ROM";
	p->start = mem_res->start + 0xc0000UL;
	p->end = p->start + 0x7fffUL;
	p->flags = IORESOURCE_BUSY;
	request_resource(mem_res, p);
}

/* Generic helper routines for PCI error reporting. */
void pci_scan_for_target_abort(struct pci_controller_info *p,
			       struct pci_pbm_info *pbm,
			       struct pci_bus *pbus)
{
	struct pci_dev *pdev;
	struct pci_bus *bus;

	list_for_each_entry(pdev, &pbus->devices, bus_list) {
		u16 status, error_bits;

		pci_read_config_word(pdev, PCI_STATUS, &status);
		error_bits =
			(status & (PCI_STATUS_SIG_TARGET_ABORT |
				   PCI_STATUS_REC_TARGET_ABORT));
		if (error_bits) {
			pci_write_config_word(pdev, PCI_STATUS, error_bits);
			printk("PCI%d(PBM%c): Device [%s] saw Target Abort [%016x]\n",
			       p->index, ((pbm == &p->pbm_A) ? 'A' : 'B'),
			       pci_name(pdev), status);
		}
	}

	list_for_each_entry(bus, &pbus->children, node)
		pci_scan_for_target_abort(p, pbm, bus);
}

void pci_scan_for_master_abort(struct pci_controller_info *p,
			       struct pci_pbm_info *pbm,
			       struct pci_bus *pbus)
{
	struct pci_dev *pdev;
	struct pci_bus *bus;

	list_for_each_entry(pdev, &pbus->devices, bus_list) {
		u16 status, error_bits;

		pci_read_config_word(pdev, PCI_STATUS, &status);
		error_bits =
			(status & (PCI_STATUS_REC_MASTER_ABORT));
		if (error_bits) {
			pci_write_config_word(pdev, PCI_STATUS, error_bits);
			printk("PCI%d(PBM%c): Device [%s] received Master Abort [%016x]\n",
			       p->index, ((pbm == &p->pbm_A) ? 'A' : 'B'),
			       pci_name(pdev), status);
		}
	}

	list_for_each_entry(bus, &pbus->children, node)
		pci_scan_for_master_abort(p, pbm, bus);
}

void pci_scan_for_parity_error(struct pci_controller_info *p,
			       struct pci_pbm_info *pbm,
			       struct pci_bus *pbus)
{
	struct pci_dev *pdev;
	struct pci_bus *bus;

	list_for_each_entry(pdev, &pbus->devices, bus_list) {
		u16 status, error_bits;

		pci_read_config_word(pdev, PCI_STATUS, &status);
		error_bits =
			(status & (PCI_STATUS_PARITY |
				   PCI_STATUS_DETECTED_PARITY));
		if (error_bits) {
			pci_write_config_word(pdev, PCI_STATUS, error_bits);
			printk("PCI%d(PBM%c): Device [%s] saw Parity Error [%016x]\n",
			       p->index, ((pbm == &p->pbm_A) ? 'A' : 'B'),
			       pci_name(pdev), status);
		}
	}

	list_for_each_entry(bus, &pbus->children, node)
		pci_scan_for_parity_error(p, pbm, bus);
}