1 files changed, 69 insertions, 0 deletions
diff --git a/arch/arm/mach-ixp4xx/nslu2-pci.c b/arch/arm/mach-ixp4xx/nslu2-pci.c
new file mode 100644
index 000000000..c07936a1d
--- /dev/null
+++ b/arch/arm/mach-ixp4xx/nslu2-pci.c
@@ -0,0 +1,69 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * arch/arm/mach-ixp4xx/nslu2-pci.c
+ *
+ * NSLU2 board-level PCI initialization
+ *
+ * based on ixdp425-pci.c:
+ *	Copyright (C) 2002 Intel Corporation.
+ *	Copyright (C) 2003-2004 MontaVista Software, Inc.
+ *
+ * Maintainer: http://www.nslu2-linux.org/
+ */
+
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <asm/mach/pci.h>
+#include <asm/mach-types.h>
+
+#include "irqs.h"
+
+#define MAX_DEV		3
+#define IRQ_LINES	3
+
+/* PCI controller GPIO to IRQ pin mappings */
+#define INTA		11
+#define INTB		10
+#define INTC		9
+#define INTD		8
+
+void __init nslu2_pci_preinit(void)
+{
+	irq_set_irq_type(IXP4XX_GPIO_IRQ(INTA), IRQ_TYPE_LEVEL_LOW);
+	irq_set_irq_type(IXP4XX_GPIO_IRQ(INTB), IRQ_TYPE_LEVEL_LOW);
+	irq_set_irq_type(IXP4XX_GPIO_IRQ(INTC), IRQ_TYPE_LEVEL_LOW);
+	ixp4xx_pci_preinit();
+}
+
+static int __init nslu2_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
+{
+	static int pci_irq_table[IRQ_LINES] = {
+		IXP4XX_GPIO_IRQ(INTA),
+		IXP4XX_GPIO_IRQ(INTB),
+		IXP4XX_GPIO_IRQ(INTC),
+	};
+
+	if (slot >= 1 && slot <= MAX_DEV && pin >= 1 && pin <= IRQ_LINES)
+		return pci_irq_table[(slot + pin - 2) % IRQ_LINES];
+
+	return -1;
+}
+
+struct hw_pci __initdata nslu2_pci = {
+	.nr_controllers = 1,
+	.ops		= &ixp4xx_ops,
+	.preinit	= nslu2_pci_preinit,
+	.setup		= ixp4xx_setup,
+	.map_irq	= nslu2_map_irq,
+};
+
+int __init nslu2_pci_init(void) /* monkey see, monkey do */
+{
+	if (machine_is_nslu2())
+		pci_common_init(&nslu2_pci);
+
+	return 0;
+}
+
+subsys_initcall(nslu2_pci_init);