patch-2.3.16 linux/arch/sparc64/kernel/pci_common.c

• Lines: 639
• Date: Tue Aug 31 11:23:30 1999
• Orig file: v2.3.15/linux/arch/sparc64/kernel/pci_common.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.15/linux/arch/sparc64/kernel/pci_common.c linux/arch/sparc64/kernel/pci_common.c
@@ -0,0 +1,638 @@
+/* $Id: pci_common.c,v 1.2 1999/08/31 09:12:33 davem Exp $
+ * pci_common.c: PCI controller common support.
+ *
+ * Copyright (C) 1999 David S. Miller (davem@redhat.com)
+ */
+
+#include <linux/string.h>
+#include <linux/malloc.h>
+#include <linux/init.h>
+
+#include <asm/pbm.h>
+
+/* Find the OBP PROM device tree node for a PCI device.
+ * Return zero if not found.
+ */
+static int __init find_device_prom_node(struct pci_pbm_info *pbm,
+					struct pci_dev *pdev,
+					int bus_prom_node,
+					struct linux_prom_pci_registers *pregs,
+					int *nregs)
+{
+	int node;
+
+	node = prom_getchild(bus_prom_node);
+	while (node != 0) {
+		int err = prom_getproperty(node, "reg",
+					   (char *)pregs,
+					   sizeof(*pregs) * PROMREG_MAX);
+		if (err == 0 || err == -1)
+			goto do_next_sibling;
+		if (((pregs[0].phys_hi >> 8) & 0xff) == pdev->devfn) {
+			*nregs = err / sizeof(*pregs);
+			return node;
+		}
+
+	do_next_sibling:
+		node = prom_getsibling(node);
+	}
+	return 0;
+}
+
+/* Remove a PCI device from the device trees, then
+ * free it up.  Note that this must run before
+ * the device's resources are registered because we
+ * do not handle unregistering them here.
+ */
+static void pci_device_delete(struct pci_dev *pdev)
+{
+	struct pci_dev **dpp;
+
+	/* First, unlink from list of all devices. */
+	dpp = &pci_devices;
+	while (*dpp != NULL) {
+		if (*dpp == pdev) {
+			*dpp = pdev->next;
+			pdev->next = NULL;
+			break;
+		}
+		dpp = &(*dpp)->next;
+	}
+
+	/* Next, unlink from bus sibling chain. */
+	dpp = &pdev->bus->devices;
+	while (*dpp != NULL) {
+		if (*dpp == pdev) {
+			*dpp = pdev->sibling;
+			pdev->sibling = NULL;
+			break;
+		}
+		dpp = &(*dpp)->sibling;
+	}
+
+	/* Ok, all references are gone, free it up. */
+	kfree(pdev);
+}
+
+/* Fill in the PCI device cookie sysdata for the given
+ * PCI device.  This cookie is the means by which one
+ * can get to OBP and PCI controller specific information
+ * for a PCI device.
+ */
+static void __init pdev_cookie_fillin(struct pci_pbm_info *pbm,
+				      struct pci_dev *pdev,
+				      int bus_prom_node)
+{
+	struct linux_prom_pci_registers pregs[PROMREG_MAX];
+	struct pcidev_cookie *pcp;
+	int device_prom_node, nregs, err;
+
+	device_prom_node = find_device_prom_node(pbm, pdev, bus_prom_node,
+						 pregs, &nregs);
+	if (device_prom_node == 0) {
+		/* If it is not in the OBP device tree then
+		 * there must be a damn good reason for it.
+		 *
+		 * So what we do is delete the device from the
+		 * PCI device tree completely.  This scenerio
+		 * is seen, for example, on CP1500 for the
+		 * second EBUS/HappyMeal pair if the external
+		 * connector for it is not present.
+		 */
+		pci_device_delete(pdev);
+		return;
+	}
+
+	pcp = kmalloc(sizeof(*pcp), GFP_ATOMIC);
+	if (pcp == NULL) {
+		prom_printf("PCI_COOKIE: Fatal malloc error, aborting...\n");
+		prom_halt();
+	}
+	pcp->pbm = pbm;
+	pcp->prom_node = device_prom_node;
+	memcpy(pcp->prom_regs, pregs, sizeof(pcp->prom_regs));
+	pcp->num_prom_regs = nregs;
+	err = prom_getproperty(device_prom_node, "name",
+			       pcp->prom_name, sizeof(pcp->prom_name));
+	if (err > 0)
+		pcp->prom_name[err] = 0;
+	else
+		pcp->prom_name[0] = 0;
+	if (strcmp(pcp->prom_name, "ebus") == 0) {
+		struct linux_prom_ebus_ranges erng[PROM_PCIRNG_MAX];
+		int iter;
+
+		/* EBUS is special... */
+		err = prom_getproperty(device_prom_node, "ranges",
+				       (char *)&erng[0], sizeof(erng));
+		if (err == 0 || err == -1) {
+			prom_printf("EBUS: Fatal error, no range property\n");
+			prom_halt();
+		}
+		err = (err / sizeof(erng[0]));
+		for(iter = 0; iter < err; iter++) {
+			struct linux_prom_ebus_ranges *ep = &erng[iter];
+			struct linux_prom_pci_registers *ap;
+
+			ap = &pcp->prom_assignments[iter];
+
+			ap->phys_hi = ep->parent_phys_hi;
+			ap->phys_mid = ep->parent_phys_mid;
+			ap->phys_lo = ep->parent_phys_lo;
+			ap->size_hi = 0;
+			ap->size_lo = ep->size;
+		}
+		pcp->num_prom_assignments = err;
+	} else {
+		err = prom_getproperty(device_prom_node,
+				       "assigned-addresses",
+				       (char *)pcp->prom_assignments,
+				       sizeof(pcp->prom_assignments));
+		if (err == 0 || err == -1)
+			pcp->num_prom_assignments = 0;
+		else
+			pcp->num_prom_assignments =
+				(err / sizeof(pcp->prom_assignments[0]));
+	}
+
+	pdev->sysdata = pcp;
+}
+
+void __init pci_fill_in_pbm_cookies(struct pci_bus *pbus,
+				    struct pci_pbm_info *pbm,
+				    int prom_node)
+{
+	struct pci_dev *pdev;
+
+	/* This loop is coded like this because the cookie
+	 * fillin routine can delete devices from the tree.
+	 */
+	pdev = pbus->devices;
+	while (pdev != NULL) {
+		struct pci_dev *next = pdev->sibling;
+
+		pdev_cookie_fillin(pbm, pdev, prom_node);
+
+		pdev = next;
+	}
+
+	for (pbus = pbus->children; pbus; pbus = pbus->next) {
+		struct pcidev_cookie *pcp = pbus->self->sysdata;
+		pci_fill_in_pbm_cookies(pbus, pbm, pcp->prom_node);
+	}
+}
+
+static void __init bad_assignment(struct linux_prom_pci_registers *ap,
+				  struct resource *res,
+				  int do_prom_halt)
+{
+	prom_printf("PCI: Bogus PROM assignment.\n");
+	if (ap)
+		prom_printf("PCI: phys[%08x:%08x:%08x] size[%08x:%08x]\n",
+			    ap->phys_hi, ap->phys_mid, ap->phys_lo,
+			    ap->size_hi, ap->size_lo);
+	if (res)
+		prom_printf("PCI: RES[%016lx-->%016lx:(%lx)]\n",
+			    res->start, res->end, res->flags);
+	prom_printf("Please email this information to davem@redhat.com\n");
+	if (do_prom_halt)
+		prom_halt();
+}
+
+static struct resource *
+__init get_root_resource(struct linux_prom_pci_registers *ap,
+			 struct pci_pbm_info *pbm)
+{
+	int space = (ap->phys_hi >> 24) & 3;
+
+	switch (space) {
+	case 0:
+		/* Configuration space, silently ignore it. */
+		return NULL;
+
+	case 1:
+		/* 16-bit IO space */
+		return &pbm->io_space;
+
+	case 2:
+		/* 32-bit MEM space */
+		return &pbm->mem_space;
+
+	case 3:
+	default:
+		/* 64-bit MEM space, unsupported. */
+		printk("PCI: 64-bit MEM assignment??? "
+		       "Tell davem@redhat.com about it!\n");
+		return NULL;
+	};
+}
+
+static struct resource *
+__init get_device_resource(struct linux_prom_pci_registers *ap,
+			   struct pci_dev *pdev)
+{
+	int breg = (ap->phys_hi & 0xff);
+	int space = (ap->phys_hi >> 24) & 3;
+
+	switch (breg) {
+	case  PCI_ROM_ADDRESS:
+		/* It had better be MEM space. */
+		if (space != 2)
+			bad_assignment(ap, NULL, 0);
+
+		return &pdev->resource[PCI_ROM_RESOURCE];
+
+	case PCI_BASE_ADDRESS_0:
+	case PCI_BASE_ADDRESS_1:
+	case PCI_BASE_ADDRESS_2:
+	case PCI_BASE_ADDRESS_3:
+	case PCI_BASE_ADDRESS_4:
+	case PCI_BASE_ADDRESS_5:
+		return &pdev->resource[(breg - PCI_BASE_ADDRESS_0) / 4];
+
+	default:
+		bad_assignment(ap, NULL, 0);
+		return NULL;
+	};
+}
+
+static void __init pdev_record_assignments(struct pci_pbm_info *pbm,
+					   struct pci_dev *pdev)
+{
+	struct pcidev_cookie *pcp = pdev->sysdata;
+	int i;
+
+	for (i = 0; i < pcp->num_prom_assignments; i++) {
+		struct linux_prom_pci_registers *ap;
+		struct resource *root, *res;
+
+		/* The format of this property is specified in
+		 * the PCI Bus Binding to IEEE1275-1994.
+		 */
+		ap = &pcp->prom_assignments[i];
+		root = get_root_resource(ap, pbm);
+		res = get_device_resource(ap, pdev);
+		if (root == NULL || res == NULL)
+			continue;
+
+		/* Ok we know which resource this PROM assignment is
+		 * for, sanity check it.
+		 */
+		if ((res->start & 0xffffffffUL) != ap->phys_lo)
+			bad_assignment(ap, res, 1);
+
+		/* Adjust the resource into the physical address space
+		 * of this PBM.
+		 */
+		pbm->parent->resource_adjust(pdev, res, root);
+
+		if (request_resource(root, res) < 0) {
+			/* OK, there is some conflict.  But this is fine
+			 * since we'll reassign it in the fixup pass.
+			 * Nevertheless notify the user that OBP made
+			 * an error.
+			 */
+			printk(KERN_ERR "PCI: Address space collision on region %ld "
+			       "of device %s\n",
+			       (res - &pdev->resource[0]), pdev->name);
+		}
+	}
+}
+
+void __init pci_record_assignments(struct pci_pbm_info *pbm,
+				   struct pci_bus *pbus)
+{
+	struct pci_dev *pdev;
+
+	for (pdev = pbus->devices; pdev; pdev = pdev->sibling)
+		pdev_record_assignments(pbm, pdev);
+
+	for (pbus = pbus->children; pbus; pbus = pbus->next)
+		pci_record_assignments(pbm, pbus);
+}
+
+static void __init pdev_assign_unassigned(struct pci_pbm_info *pbm,
+					  struct pci_dev *pdev)
+{
+	u32 reg;
+	u16 cmd;
+	int i, io_seen, mem_seen;
+
+	io_seen = mem_seen = 0;
+	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
+		struct resource *root, *res;
+		unsigned long size, min, max, align;
+
+		res = &pdev->resource[i];
+
+		if (res->flags & IORESOURCE_IO)
+			io_seen++;
+		else if (res->flags & IORESOURCE_MEM)
+			mem_seen++;
+
+		/* If it is already assigned or the resource does
+		 * not exist, there is nothing to do.
+		 */
+		if (res->parent != NULL || res->flags == 0UL)
+			continue;
+
+		/* Determine the root we allocate from. */
+		if (res->flags & IORESOURCE_IO) {
+			root = &pbm->io_space;
+			min = root->start + 0x400UL;
+			max = root->end;
+		} else {
+			root = &pbm->mem_space;
+			min = root->start;
+			max = min + 0x80000000UL;
+		}
+
+		size = res->end - res->start;
+		align = size + 1;
+		if (allocate_resource(root, res, size + 1, min, max, align) < 0) {
+			/* uh oh */
+			prom_printf("PCI: Failed to allocate resource %d for %s\n",
+				    i, pdev->name);
+			prom_halt();
+		}
+
+		/* Update PCI config space. */
+		pbm->parent->base_address_update(pdev, i);
+	}
+
+	/* Special case, disable the ROM.  Several devices
+	 * act funny (ie. do not respond to memory space writes)
+	 * when it is left enabled.  A good example are Qlogic,ISP
+	 * adapters.
+	 */
+	pci_read_config_dword(pdev, PCI_ROM_ADDRESS, &reg);
+	reg &= ~PCI_ROM_ADDRESS_ENABLE;
+	pci_write_config_dword(pdev, PCI_ROM_ADDRESS, reg);
+
+	/* If we saw I/O or MEM resources, enable appropriate
+	 * bits in PCI command register.
+	 */
+	if (io_seen || mem_seen) {
+		pci_read_config_word(pdev, PCI_COMMAND, &cmd);
+		if (io_seen)
+			cmd |= PCI_COMMAND_IO;
+		if (mem_seen)
+			cmd |= PCI_COMMAND_MEMORY;
+		pci_write_config_word(pdev, PCI_COMMAND, cmd);
+	}
+
+	/* If this is a PCI bridge or an IDE controller,
+	 * enable bus mastering.  In the former case also
+	 * set the cache line size correctly.
+	 */
+	if (((pdev->class >> 8) == PCI_CLASS_BRIDGE_PCI) ||
+	    (((pdev->class >> 8) == PCI_CLASS_STORAGE_IDE) &&
+	     ((pdev->class & 0x80) != 0))) {
+		pci_read_config_word(pdev, PCI_COMMAND, &cmd);
+		cmd |= PCI_COMMAND_MASTER;
+		pci_write_config_word(pdev, PCI_COMMAND, cmd);
+
+		if ((pdev->class >> 8) == PCI_CLASS_BRIDGE_PCI)
+			pci_write_config_byte(pdev,
+					      PCI_CACHE_LINE_SIZE,
+					      (64 / sizeof(u32)));
+	}
+}
+
+void __init pci_assign_unassigned(struct pci_pbm_info *pbm,
+				  struct pci_bus *pbus)
+{
+	struct pci_dev *pdev;
+
+	for (pdev = pbus->devices; pdev; pdev = pdev->sibling)
+		pdev_assign_unassigned(pbm, pdev);
+
+	for (pbus = pbus->children; pbus; pbus = pbus->next)
+		pci_assign_unassigned(pbm, pbus);
+}
+
+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 *pregs = dev_pcp->prom_regs;
+	unsigned int hi, mid, lo, irq;
+	int i;
+
+	if (pbm->num_pbm_intmap == 0)
+		return 0;
+
+	/* If we are underneath a PCI bridge, use PROM register
+	 * property of parent bridge.
+	 */
+	if (pdev->bus->number != pbm->pci_first_busno) {
+		struct pcidev_cookie *bus_pcp;
+		int offset;
+
+		bus_pcp = pdev->bus->self->sysdata;
+		pregs = bus_pcp->prom_regs;
+		offset = prom_getint(bus_pcp->prom_node,
+				     "fcode-rom-offset");
+
+		/* Did PROM know better and assign an interrupt other
+		 * than #INTA to the device? - We test here for presence of
+		 * FCODE on the card, in this case we assume PROM has set
+		 * correct 'interrupts' property, unless it is quadhme.
+		 */
+		if (offset == -1 ||
+		    !strcmp(bus_pcp->prom_name, "SUNW,qfe") ||
+		    !strcmp(bus_pcp->prom_name, "qfe")) {
+			/*
+			 * No, use low slot number bits of child as IRQ line.
+			 */
+			*interrupt = ((*interrupt - 1 + PCI_SLOT(pdev->devfn)) & 3) + 1;
+		}
+	}
+
+	hi   = pregs->phys_hi & pbm->pbm_intmask.phys_hi;
+	mid  = pregs->phys_mid & pbm->pbm_intmask.phys_mid;
+	lo   = pregs->phys_lo & pbm->pbm_intmask.phys_lo;
+	irq  = *interrupt & pbm->pbm_intmask.interrupt;
+
+	for (i = 0; i < pbm->num_pbm_intmap; i++) {
+		if (pbm->pbm_intmap[i].phys_hi  == hi	&&
+		    pbm->pbm_intmap[i].phys_mid == mid	&&
+		    pbm->pbm_intmap[i].phys_lo  == lo	&&
+		    pbm->pbm_intmap[i].interrupt == irq) {
+			*interrupt = pbm->pbm_intmap[i].cinterrupt;
+			return 1;
+		}
+	}
+
+	prom_printf("pbm_intmap_match: bus %02x, devfn %02x: ",
+		    pdev->bus->number, pdev->devfn);
+	prom_printf("IRQ [%08x.%08x.%08x.%08x] not found in interrupt-map\n",
+		    pregs->phys_hi, pregs->phys_mid, pregs->phys_lo, *interrupt);
+	prom_printf("Please email this information to davem@redhat.com\n");
+	prom_halt();
+}
+
+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 = p->portid;
+	unsigned int prom_irq;
+	int prom_node = pcp->prom_node;
+	int err;
+
+	err = prom_getproperty(prom_node, "interrupts",
+			       (char *)&prom_irq, sizeof(prom_irq));
+	if (err == 0 || err == -1) {
+		pdev->irq = 0;
+		return;
+	}
+
+	/* Fully specified already? */
+	if (((prom_irq & PCI_IRQ_IGN) >> 6) == portid) {
+		pdev->irq = p->irq_build(p, pdev, prom_irq);
+		goto have_irq;
+	}
+
+	/* An onboard device? (bit 5 set) */
+	if ((prom_irq & PCI_IRQ_INO) & 0x20) {
+		pdev->irq = p->irq_build(p, 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(p, 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. */
+		if (pdev->bus->number == pbm->pci_first_busno) {
+			if (pbm == &pbm->parent->pbm_A)
+				slot = (pdev->devfn >> 3) - 1;
+			else
+				slot = (pdev->devfn >> 3) - 2;
+		} else {
+			if (pbm == &pbm->parent->pbm_A)
+				slot = (pdev->bus->self->devfn >> 3) - 1;
+			else
+				slot = (pdev->bus->self->devfn >> 3) - 2;
+		}
+		slot = slot << 2;
+
+		pdev->irq = p->irq_build(p, 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 *pdev;
+
+	for (pdev = pbus->devices; pdev; pdev = pdev->sibling)
+		pdev_fixup_irq(pdev);
+
+	for (pbus = pbus->children; pbus; pbus = pbus->next)
+		pci_fixup_irq(pbm, pbus);
+}
+
+/* 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;
+
+	for (pdev = pbus->devices; pdev; pdev = pdev->sibling) {
+		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'),
+			       pdev->name, status);
+		}
+	}
+
+	for (pbus = pbus->children; pbus; pbus = pbus->next)
+		pci_scan_for_target_abort(p, pbm, pbus);
+}
+
+void pci_scan_for_master_abort(struct pci_controller_info *p,
+			       struct pci_pbm_info *pbm,
+			       struct pci_bus *pbus)
+{
+	struct pci_dev *pdev;
+
+	for (pdev = pbus->devices; pdev; pdev = pdev->sibling) {
+		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'),
+			       pdev->name, status);
+		}
+	}
+
+	for (pbus = pbus->children; pbus; pbus = pbus->next)
+		pci_scan_for_master_abort(p, pbm, pbus);
+}
+
+void pci_scan_for_parity_error(struct pci_controller_info *p,
+			       struct pci_pbm_info *pbm,
+			       struct pci_bus *pbus)
+{
+	struct pci_dev *pdev;
+
+	for (pdev = pbus->devices; pdev; pdev = pdev->sibling) {
+		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'),
+			       pdev->name, status);
+		}
+	}
+
+	for (pbus = pbus->children; pbus; pbus = pbus->next)
+		pci_scan_for_parity_error(p, pbm, pbus);
+}