ixp4xx/vulcan: add PCI support

Add PCI support for the Vulcan board, supporting USB and CF ports.
The PC/104 bus (actually a hack on the second CarBus slot) is not
currently supported.

Signed-off-by: Marc Zyngier <maz@misterjones.org>
Cc: Imre Kaloz <kaloz@openwrt.org>
Cc: Krzysztof Halasa <khc@pm.waw.pl>
Signed-off-by: Krzysztof Hałasa <khc@pm.waw.pl>

2 files changed, 74 insertions, 0 deletions

diff --git a/arch/arm/mach-ixp4xx/Makefile b/arch/arm/mach-ixp4xx/Makefile
index ab39693cb716..d807fc367dd3 100644
--- a/arch/arm/mach-ixp4xx/Makefile
+++ b/arch/arm/mach-ixp4xx/Makefile
@@ -16,6 +16,7 @@ obj-pci-$(CONFIG_MACH_DSMG600)		+= dsmg600-pci.o
 obj-pci-$(CONFIG_MACH_GATEWAY7001)      += gateway7001-pci.o
 obj-pci-$(CONFIG_MACH_WG302V2)          += wg302v2-pci.o
 obj-pci-$(CONFIG_MACH_FSG)              += fsg-pci.o
+obj-pci-$(CONFIG_MACH_ARCOM_VULCAN)     += vulcan-pci.o
 
 obj-y   += common.o
 
diff --git a/arch/arm/mach-ixp4xx/vulcan-pci.c b/arch/arm/mach-ixp4xx/vulcan-pci.c
new file mode 100644
index 000000000000..f3111c6840ef
--- /dev/null
+++ b/arch/arm/mach-ixp4xx/vulcan-pci.c
@@ -0,0 +1,73 @@
+/*
+ * arch/arch/mach-ixp4xx/vulcan-pci.c
+ *
+ * Vulcan board-level PCI initialization
+ *
+ * Copyright (C) 2010 Marc Zyngier <maz@misterjones.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>
+
+/* PCI controller GPIO to IRQ pin mappings */
+#define INTA    2
+#define INTB    3
+
+void __init vulcan_pci_preinit(void)
+{
+#ifndef CONFIG_IXP4XX_INDIRECT_PCI
+        /*
+         * Cardbus bridge wants way more than the SoC can actually offer,
+         * and leaves the whole PCI bus in a mess. Artificially limit it
+         * to 8MB per region. Of course indirect mode doesn't have this
+         * limitation...
+         */
+        pci_cardbus_mem_size = SZ_8M;
+        pr_info("Vulcan PCI: limiting CardBus memory size to %dMB\n",
+                (int)(pci_cardbus_mem_size >> 20));
+#endif
+        set_irq_type(IXP4XX_GPIO_IRQ(INTA), IRQ_TYPE_LEVEL_LOW);
+        set_irq_type(IXP4XX_GPIO_IRQ(INTB), IRQ_TYPE_LEVEL_LOW);
+        ixp4xx_pci_preinit();
+}
+
+static int __init vulcan_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
+{
+        if (slot == 1)
+                return IXP4XX_GPIO_IRQ(INTA);
+
+        if (slot == 2)
+                return IXP4XX_GPIO_IRQ(INTB);
+
+        return -1;
+}
+
+struct hw_pci vulcan_pci __initdata = {
+        .nr_controllers = 1,
+        .preinit        = vulcan_pci_preinit,
+        .swizzle        = pci_std_swizzle,
+        .setup          = ixp4xx_setup,
+        .scan           = ixp4xx_scan_bus,
+        .map_irq        = vulcan_map_irq,
+};
+
+int __init vulcan_pci_init(void)
+{
+        if (machine_is_arcom_vulcan())
+                pci_common_init(&vulcan_pci);
+        return 0;
+}
+
+subsys_initcall(vulcan_pci_init);