PCI: Place interrupt related code into irq.c

Interrupt related code is spread into irq.c, pci.c, and setup-irq.c.
Group them into pre-existing irq.c.

Link: https://lore.kernel.org/r/20240129113655.3368-1-ilpo.jarvinen@linux.intel.com
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

1 files changed, 0 insertions, 64 deletions

diff --git a/drivers/pci/setup-irq.c b/drivers/pci/setup-irq.c
deleted file mode 100644
index cc7d26b015f3..000000000000
--- a/drivers/pci/setup-irq.c
+++ /dev/null
@@ -1,64 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Support routines for initializing a PCI subsystem
- *
- * Extruded from code written by
- *      Dave Rusling (david.rusling@reo.mts.dec.com)
- *      David Mosberger (davidm@cs.arizona.edu)
- *	David Miller (davem@redhat.com)
- */
-
-#include <linux/kernel.h>
-#include <linux/pci.h>
-#include <linux/errno.h>
-#include <linux/ioport.h>
-#include <linux/cache.h>
-#include "pci.h"
-
-void pci_assign_irq(struct pci_dev *dev)
-{
-	u8 pin;
-	u8 slot = -1;
-	int irq = 0;
-	struct pci_host_bridge *hbrg = pci_find_host_bridge(dev->bus);
-
-	if (!(hbrg->map_irq)) {
-		pci_dbg(dev, "runtime IRQ mapping not provided by arch\n");
-		return;
-	}
-
-	/*
-	 * If this device is not on the primary bus, we need to figure out
-	 * which interrupt pin it will come in on. We know which slot it
-	 * will come in on because that slot is where the bridge is. Each
-	 * time the interrupt line passes through a PCI-PCI bridge we must
-	 * apply the swizzle function.
-	 */
-	pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
-	/* Cope with illegal. */
-	if (pin > 4)
-		pin = 1;
-
-	if (pin) {
-		/* Follow the chain of bridges, swizzling as we go. */
-		if (hbrg->swizzle_irq)
-			slot = (*(hbrg->swizzle_irq))(dev, &pin);
-
-		/*
-		 * If a swizzling function is not used, map_irq() must
-		 * ignore slot.
-		 */
-		irq = (*(hbrg->map_irq))(dev, slot, pin);
-		if (irq == -1)
-			irq = 0;
-	}
-	dev->irq = irq;
-
-	pci_dbg(dev, "assign IRQ: got %d\n", dev->irq);
-
-	/*
-	 * Always tell the device, so the driver knows what is the real IRQ
-	 * to use; the device does not use it.
-	 */
-	pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
-}