From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Wed, 5 Aug 2015 17:04:01 -0300
Subject: Initial import

---
 arch/arm/mach-ixp4xx/fsg-pci.c | 75 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 arch/arm/mach-ixp4xx/fsg-pci.c

(limited to 'arch/arm/mach-ixp4xx/fsg-pci.c')

diff --git a/arch/arm/mach-ixp4xx/fsg-pci.c b/arch/arm/mach-ixp4xx/fsg-pci.c
new file mode 100644
index 000000000..fd4a8625b
--- /dev/null
+++ b/arch/arm/mach-ixp4xx/fsg-pci.c
@@ -0,0 +1,75 @@
+/*
+ * arch/arch/mach-ixp4xx/fsg-pci.c
+ *
+ * FSG board-level PCI initialization
+ *
+ * Author: Rod Whitby <rod@whitby.id.au>
+ * Maintainer: http://www.nslu2-linux.org/
+ *
+ * based on ixdp425-pci.c:
+ *	Copyright (C) 2002 Intel Corporation.
+ *	Copyright (C) 2003-2004 MontaVista Software, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <asm/mach/pci.h>
+#include <asm/mach-types.h>
+
+#define MAX_DEV		3
+#define IRQ_LINES	3
+
+/* PCI controller GPIO to IRQ pin mappings */
+#define INTA	6
+#define INTB	7
+#define INTC	5
+
+void __init fsg_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 fsg_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
+{
+	static int pci_irq_table[IRQ_LINES] = {
+		IXP4XX_GPIO_IRQ(INTC),
+		IXP4XX_GPIO_IRQ(INTB),
+		IXP4XX_GPIO_IRQ(INTA),
+	};
+
+	int irq = -1;
+	slot -= 11;
+
+	if (slot >= 1 && slot <= MAX_DEV && pin >= 1 && pin <= IRQ_LINES)
+		irq = pci_irq_table[slot - 1];
+	printk(KERN_INFO "%s: Mapped slot %d pin %d to IRQ %d\n",
+	       __func__, slot, pin, irq);
+
+	return irq;
+}
+
+struct hw_pci fsg_pci __initdata = {
+	.nr_controllers = 1,
+	.ops		= &ixp4xx_ops,
+	.preinit =	  fsg_pci_preinit,
+	.setup =	  ixp4xx_setup,
+	.map_irq =	  fsg_map_irq,
+};
+
+int __init fsg_pci_init(void)
+{
+	if (machine_is_fsg())
+		pci_common_init(&fsg_pci);
+	return 0;
+}
+
+subsys_initcall(fsg_pci_init);
-- 
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