USB Gadget driver for Samsung s3c2410 ARM SoC

This patch adds the support for the Usb Device Controller on Samsung
S3C24xx SoCs.  This driver passes all tests from testusb (including #13)
and has been tested on S3C2410, S3C24212, and S3C2440 SoCs.

Whitespace updates, minor cleanups by David

Signed-off-by: Arnaud Patard <arnaud.patard@rtp-net.org>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Cc: Herbert Pötzl <herbert@13thfloor.at>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/gadget/Kconfig

@@ -208,6 +208,27 @@ config USB_OTG
 
 	   Select this only if your OMAP board has a Mini-AB connector.
 
+config USB_GADGET_S3C2410
+	boolean "S3C2410 USB Device Controller"
+	depends on ARCH_S3C2410
+	help
+	  Samsung's S3C2410 is an ARM-4 processor with an integrated
+	  full speed USB 1.1 device controller.  It has 4 configurable
+	  endpoints, as well as endpoint zero (for control transfers).
+
+	  This driver has been tested on the S3C2410, S3C2412, and
+	  S3C2440 processors.
+
+config USB_S3C2410
+	tristate
+	depends on USB_GADGET_S3C2410
+	default USB_GADGET
+	select USB_GADGET_SELECTED
+
+config USB_S3C2410_DEBUG
+	boolean "S3C2410 udc debug messages"
+	depends on USB_GADGET_S3C2410
+
 config USB_GADGET_AT91
 	boolean "AT91 USB Device Port"
 	depends on ARCH_AT91 && !ARCH_AT91SAM9RL

drivers/usb/gadget/Makefile

@@ -7,6 +7,7 @@ obj-$(CONFIG_USB_PXA2XX)	+= pxa2xx_udc.o
 obj-$(CONFIG_USB_GOKU)		+= goku_udc.o
 obj-$(CONFIG_USB_OMAP)		+= omap_udc.o
 obj-$(CONFIG_USB_LH7A40X)	+= lh7a40x_udc.o
+obj-$(CONFIG_USB_S3C2410)	+= s3c2410_udc.o
 obj-$(CONFIG_USB_AT91)		+= at91_udc.o
 obj-$(CONFIG_USB_FSL_USB2)	+= fsl_usb2_udc.o
 obj-$(CONFIG_USB_M66592)	+= m66592-udc.o

drivers/usb/gadget/s3c2410_udc.h

@@ -0,0 +1,110 @@
+/*
+ * linux/drivers/usb/gadget/s3c2410_udc.h
+ * Samsung on-chip full speed USB device controllers
+ *
+ * Copyright (C) 2004-2007 Herbert Pötzl - Arnaud Patard
+ *	Additional cleanups by Ben Dooks <ben-linux@fluff.org>
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#ifndef _S3C2410_UDC_H
+#define _S3C2410_UDC_H
+
+struct s3c2410_ep {
+	struct list_head		queue;
+	unsigned long			last_io;	/* jiffies timestamp */
+	struct usb_gadget		*gadget;
+	struct s3c2410_udc		*dev;
+	const struct usb_endpoint_descriptor *desc;
+	struct usb_ep			ep;
+	u8				num;
+
+	unsigned short			fifo_size;
+	u8				bEndpointAddress;
+	u8				bmAttributes;
+
+	unsigned			halted : 1;
+	unsigned			already_seen : 1;
+	unsigned			setup_stage : 1;
+};
+
+
+/* Warning : ep0 has a fifo of 16 bytes */
+/* Don't try to set 32 or 64            */
+/* also testusb 14 fails  wit 16 but is */
+/* fine with 8                          */
+#define EP0_FIFO_SIZE		 8
+#define EP_FIFO_SIZE		64
+#define DEFAULT_POWER_STATE	0x00
+
+#define S3C2440_EP_FIFO_SIZE	128
+
+static const char ep0name [] = "ep0";
+
+static const char *const ep_name[] = {
+	ep0name,                                /* everyone has ep0 */
+	/* s3c2410 four bidirectional bulk endpoints */
+	"ep1-bulk", "ep2-bulk", "ep3-bulk", "ep4-bulk",
+};
+
+#define S3C2410_ENDPOINTS       ARRAY_SIZE(ep_name)
+
+struct s3c2410_request {
+	struct list_head		queue;		/* ep's requests */
+	struct usb_request		req;
+};
+
+enum ep0_state {
+        EP0_IDLE,
+        EP0_IN_DATA_PHASE,
+        EP0_OUT_DATA_PHASE,
+        EP0_END_XFER,
+        EP0_STALL,
+};
+
+static const char *ep0states[]= {
+        "EP0_IDLE",
+        "EP0_IN_DATA_PHASE",
+        "EP0_OUT_DATA_PHASE",
+        "EP0_END_XFER",
+        "EP0_STALL",
+};
+
+struct s3c2410_udc {
+	spinlock_t			lock;
+
+	struct s3c2410_ep		ep[S3C2410_ENDPOINTS];
+	int				address;
+	struct usb_gadget		gadget;
+	struct usb_gadget_driver	*driver;
+	struct s3c2410_request		fifo_req;
+	u8				fifo_buf[EP_FIFO_SIZE];
+	u16				devstatus;
+
+	u32				port_status;
+	int				ep0state;
+
+	unsigned			got_irq : 1;
+
+	unsigned			req_std : 1;
+	unsigned			req_config : 1;
+	unsigned			req_pending : 1;
+	u8				vbus;
+	struct dentry			*regs_info;
+};
+
+#endif