From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001
From: Linus Torvalds <torvalds@ppc970.osdl.org>
Date: Sat, 16 Apr 2005 15:20:36 -0700
Subject: Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
---
arch/arm/mach-integrator/pci.c | 132 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 132 insertions(+)
create mode 100644 arch/arm/mach-integrator/pci.c
(limited to 'arch/arm/mach-integrator/pci.c')
diff --git a/arch/arm/mach-integrator/pci.c b/arch/arm/mach-integrator/pci.c
new file mode 100644
index 000000000000..394ec9261c4e
--- /dev/null
+++ b/arch/arm/mach-integrator/pci.c
@@ -0,0 +1,132 @@
+/*
+ * linux/arch/arm/mach-integrator/pci-integrator.c
+ *
+ * Copyright (C) 1999 ARM Limited
+ * Copyright (C) 2000 Deep Blue Solutions Ltd
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ *
+ * PCI functions for Integrator
+ */
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/ptrace.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+
+#include <asm/irq.h>
+#include <asm/system.h>
+#include <asm/mach/pci.h>
+#include <asm/mach-types.h>
+
+/*
+ * A small note about bridges and interrupts. The DECchip 21050 (and
+ * later) adheres to the PCI-PCI bridge specification. This says that
+ * the interrupts on the other side of a bridge are swizzled in the
+ * following manner:
+ *
+ * Dev Interrupt Interrupt
+ * Pin on Pin on
+ * Device Connector
+ *
+ * 4 A A
+ * B B
+ * C C
+ * D D
+ *
+ * 5 A B
+ * B C
+ * C D
+ * D A
+ *
+ * 6 A C
+ * B D
+ * C A
+ * D B
+ *
+ * 7 A D
+ * B A
+ * C B
+ * D C
+ *
+ * Where A = pin 1, B = pin 2 and so on and pin=0 = default = A.
+ * Thus, each swizzle is ((pin-1) + (device#-4)) % 4
+ *
+ * The following code swizzles for exactly one bridge.
+ */
+static inline int bridge_swizzle(int pin, unsigned int slot)
+{
+ return (pin + slot) & 3;
+}
+
+/*
+ * This routine handles multiple bridges.
+ */
+static u8 __init integrator_swizzle(struct pci_dev *dev, u8 *pinp)
+{
+ int pin = *pinp;
+
+ if (pin == 0)
+ pin = 1;
+
+ pin -= 1;
+ while (dev->bus->self) {
+ pin = bridge_swizzle(pin, PCI_SLOT(dev->devfn));
+ /*
+ * move up the chain of bridges, swizzling as we go.
+ */
+ dev = dev->bus->self;
+ }
+ *pinp = pin + 1;
+
+ return PCI_SLOT(dev->devfn);
+}
+
+static int irq_tab[4] __initdata = {
+ IRQ_AP_PCIINT0, IRQ_AP_PCIINT1, IRQ_AP_PCIINT2, IRQ_AP_PCIINT3
+};
+
+/*
+ * map the specified device/slot/pin to an IRQ. This works out such
+ * that slot 9 pin 1 is INT0, pin 2 is INT1, and slot 10 pin 1 is INT1.
+ */
+static int __init integrator_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
+{
+ int intnr = ((slot - 9) + (pin - 1)) & 3;
+
+ return irq_tab[intnr];
+}
+
+extern void pci_v3_init(void *);
+
+static struct hw_pci integrator_pci __initdata = {
+ .swizzle = integrator_swizzle,
+ .map_irq = integrator_map_irq,
+ .setup = pci_v3_setup,
+ .nr_controllers = 1,
+ .scan = pci_v3_scan_bus,
+ .preinit = pci_v3_preinit,
+ .postinit = pci_v3_postinit,
+};
+
+static int __init integrator_pci_init(void)
+{
+ if (machine_is_integrator())
+ pci_common_init(&integrator_pci);
+ return 0;
+}
+
+subsys_initcall(integrator_pci_init);
--
cgit v1.2.3