usb: add host support for the tilegx architecture

This change adds OHCI and EHCI support for the tilegx's on-chip
USB hardware.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>

2 files changed, 70 insertions, 0 deletions

diff --git a/arch/tile/kernel/Makefile b/arch/tile/kernel/Makefile
index 49d4ce3cd7f4..5334be8e2538 100644
--- a/arch/tile/kernel/Makefile
+++ b/arch/tile/kernel/Makefile
@@ -19,3 +19,4 @@ obj-$(CONFIG_PCI)		+= pci_gx.o
 else
 obj-$(CONFIG_PCI)               += pci.o
 endif
+obj-$(CONFIG_TILE_USB)          += usb.o
diff --git a/arch/tile/kernel/usb.c b/arch/tile/kernel/usb.c
new file mode 100644
index 000000000000..5af8debc6a71
--- /dev/null
+++ b/arch/tile/kernel/usb.c
@@ -0,0 +1,69 @@
+/*
+ * Copyright 2012 Tilera Corporation. All Rights Reserved.
+ *
+ *   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, version 2.
+ *
+ *   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, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ *
+ * Register the Tile-Gx USB interfaces as platform devices.
+ *
+ * The actual USB driver is just some glue (in
+ * drivers/usb/host/[eo]hci-tilegx.c) which makes the registers available
+ * to the standard kernel EHCI and OHCI drivers.
+ */
+
+#include <linux/dma-mapping.h>
+#include <linux/platform_device.h>
+#include <linux/usb/tilegx.h>
+#include <linux/types.h>
+
+static u64 ehci_dmamask = DMA_BIT_MASK(32);
+
+#define USB_HOST_DEF(unit, type, dmamask) \
+        static struct \
+            tilegx_usb_platform_data tilegx_usb_platform_data_ ## type ## \
+                hci ## unit = { \
+                .dev_index = unit, \
+        }; \
+        \
+        static struct platform_device tilegx_usb_ ## type ## hci ## unit = { \
+                .name           = "tilegx-" #type "hci", \
+                .id             = unit, \
+                .dev = { \
+                        .dma_mask               = dmamask, \
+                        .coherent_dma_mask      = DMA_BIT_MASK(32), \
+                        .platform_data = \
+                                &tilegx_usb_platform_data_ ## type ## hci ## \
+                                unit, \
+                }, \
+        };
+
+USB_HOST_DEF(0, e, &ehci_dmamask)
+USB_HOST_DEF(0, o, NULL)
+USB_HOST_DEF(1, e, &ehci_dmamask)
+USB_HOST_DEF(1, o, NULL)
+
+#undef USB_HOST_DEF
+
+static struct platform_device *tilegx_usb_devices[] __initdata = {
+        &tilegx_usb_ehci0,
+        &tilegx_usb_ehci1,
+        &tilegx_usb_ohci0,
+        &tilegx_usb_ohci1,
+};
+
+/** Add our set of possible USB devices. */
+static int __init tilegx_usb_init(void)
+{
+        platform_add_devices(tilegx_usb_devices,
+                             ARRAY_SIZE(tilegx_usb_devices));
+
+        return 0;
+}
+arch_initcall(tilegx_usb_init);