From 849369d6c66d3054688672f97d31fceb8e8230fb Mon Sep 17 00:00:00 2001
From: root <root@artemis.panaceas.org>
Date: Fri, 25 Dec 2015 04:40:36 +0000
Subject: initial_commit

---
 arch/arm/mach-integrator/pci.c | 124 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 124 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 00000000..2fdb9543
--- /dev/null
+++ b/arch/arm/mach-integrator/pci.c
@@ -0,0 +1,124 @@
+/*
+ *  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/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
+ */
+
+/*
+ * This routine handles multiple bridges.
+ */
+static u8 __init integrator_swizzle(struct pci_dev *dev, u8 *pinp)
+{
+	int pin = *pinp;
+
+	if (pin == 0)
+		pin = 1;
+
+	while (dev->bus->self) {
+		pin = pci_swizzle_interrupt_pin(dev, pin);
+		/*
+		 * move up the chain of bridges, swizzling as we go.
+		 */
+		dev = dev->bus->self;
+	}
+	*pinp = pin;
+
+	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);
-- 
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