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authorChris Metcalf <cmetcalf@tilera.com>2012-05-09 13:58:14 -0400
committerChris Metcalf <cmetcalf@tilera.com>2012-07-18 16:40:29 -0400
commit47fc28bff82a4dd5f6b41c97e335d10fc78a8e9a (patch)
tree829b845956f9f5f6b2997424fa1d6d72244b0d1b /arch/tile
parentd1cc1732cc62034542b042a4506d7c5043bc5e5e (diff)
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>
Diffstat (limited to 'arch/tile')
-rw-r--r--arch/tile/Kconfig10
-rw-r--r--arch/tile/kernel/Makefile1
-rw-r--r--arch/tile/kernel/usb.c69
3 files changed, 80 insertions, 0 deletions
diff --git a/arch/tile/Kconfig b/arch/tile/Kconfig
index 557e3a381ca..cf4bb69ea8e 100644
--- a/arch/tile/Kconfig
+++ b/arch/tile/Kconfig
@@ -396,6 +396,16 @@ config NO_IOPORT
source "drivers/pci/Kconfig"
+config TILE_USB
+ tristate "Tilera USB host adapter support"
+ default y
+ depends on USB
+ depends on TILEGX
+ select TILE_GXIO_USB_HOST
+ ---help---
+ Provides USB host adapter support for the built-in EHCI and OHCI
+ interfaces on TILE-Gx chips.
+
config HOTPLUG
bool "Support for hot-pluggable devices"
---help---
diff --git a/arch/tile/kernel/Makefile b/arch/tile/kernel/Makefile
index 49d4ce3cd7f..5334be8e253 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 00000000000..5af8debc6a7
--- /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);