[SPARC64]: of_device layer IRQ resolution

Do IRQ determination generically by parsing the PROM properties,
and using IRQ controller drivers for final resolution.

One immediate positive effect is that all of the IRQ frobbing
in the EBUS, ISA, and PCI controller layers has been eliminated.
We just look up the of_device and use the properly computed
value.

The PCI controller irq_build() routines are gone and no longer
used.  Unfortunately sbus_build_irq() has to remain as there is
a direct reference to this in the sunzilog driver.  That can be
killed off once the sparc32 side of this is written and the
sunzilog driver is transformed into an "of" bus driver.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 285 deletions

diff --git a/arch/sparc64/kernel/pci_common.c b/arch/sparc64/kernel/pci_common.c
index b06a2955bf5..7a59cc72c84 100644
--- a/arch/sparc64/kernel/pci_common.c
+++ b/arch/sparc64/kernel/pci_common.c
@@ -10,12 +10,10 @@
 
 #include <asm/pbm.h>
 #include <asm/prom.h>
+#include <asm/of_device.h>
 
 #include "pci_impl.h"
 
-/* Pass "pci=irq_verbose" on the kernel command line to enable this.  */
-int pci_irq_verbose;
-
 /* Fix self device of BUS and hook it into BUS->self.
  * The pci_scan_bus does not do this for the host bridge.
  */
@@ -169,6 +167,7 @@ static void __init pdev_cookie_fillin(struct pci_pbm_info *pbm,
 	}
 	pcp->pbm = pbm;
 	pcp->prom_node = dp;
+	pcp->op = of_find_device_by_node(dp);
 	memcpy(pcp->prom_regs, pregs,
 	       nregs * sizeof(struct linux_prom_pci_registers));
 	pcp->num_prom_regs = nregs;
@@ -549,296 +548,18 @@ void __init pci_assign_unassigned(struct pci_pbm_info *pbm,
 		pci_assign_unassigned(pbm, bus);
 }
 
-static inline unsigned int pci_slot_swivel(struct pci_pbm_info *pbm,
-					   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;
-
-	if (pci_irq_verbose)
-		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,
-					    struct device_node **cnode)
-{
-	struct linux_prom_pci_intmap *imap;
-	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;
-	struct property *prop;
-	int plen, num_imap, i;
-	unsigned int hi, mid, lo, irq, orig_interrupt;
-
-	*cnode = pbus_pcp->prom_node;
-
-	prop = of_find_property(pbus_pcp->prom_node, "interrupt-map", &plen);
-	if (!prop ||
-	    (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;
-	}
-	imap = prop->value;
-	num_imap = plen / sizeof(struct linux_prom_pci_intmap);
-
-	prop = of_find_property(pbus_pcp->prom_node, "interrupt-map-mask", &plen);
-	if (!prop ||
-	    (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;
-	}
-	imask = prop->value;
-
-	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 = of_find_node_by_phandle(imap[i].cnode);
-			interrupt = imap[i].cinterrupt;
-		}
-	}
-
-	if (pci_irq_verbose)
-		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 struct device_node * __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;
-	struct device_node *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;
-		struct property *prop;
-
-		prop = of_find_property(pcp->prom_node, "interrupt-map", NULL);
-		if (!prop) {
-			*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;
-	struct device_node *cnode;
-	struct property *prop;
-	unsigned int hi, mid, lo, irq;
-	int i, plen;
-
-	cnode = pci_intmap_match_to_root(pbm, pdev, interrupt);
-	if (cnode == pbm->prom_node)
-		goto success;
-
-	prop = of_find_property(cnode, "reg", &plen);
-	if (!prop ||
-	    (plen % sizeof(struct linux_prom_pci_registers)) != 0) {
-		printk("%s: OBP node %s reg property has bad len %d\n",
-		       pbm->name, cnode->full_name, plen);
-		goto fail;
-	}
-	reg = prop->value;
-
-	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:
-	if (pci_irq_verbose)
-		printk("%s: Routing bus[%2x] slot[%2x] to INO[%02x]\n",
-		       pbm->name,
-		       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;
-	struct device_node *dp = pcp->prom_node;
-	struct property *prop;
-
-	/* 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 &&
-	    !dp->child) {
-		pdev->irq = 0;
-		return;
-	}
+	struct of_device *op = pcp->op;
 
-	prop = of_find_property(dp, "interrupts", NULL);
-	if (!prop) {
-		pdev->irq = 0;
+	if (op->irqs[0] == 0xffffffff) {
+		pdev->irq = PCI_IRQ_NONE;
 		return;
 	}
-	prom_irq = *(unsigned int *) prop->value;
-
-	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));
-	}
+	pdev->irq = op->irqs[0];
 
-have_irq:
 	pci_write_config_byte(pdev, PCI_INTERRUPT_LINE,
 			      pdev->irq & PCI_IRQ_INO);
 }