[PATCH] USB: add omap_udc driver

This patch adds a UDC driver for OMAP, which should work on most
OMAP processors.  It's been tested most on OMAP 1611/5912.  The
driver supports all USB transfer types (including ISO), has limited
DMA support, and seems to work with all gadget drivers, both to
Linux hosts and to MS-Windows ones.

One reason this UDC is particularly interesting is that recent OMAP
processors all support "USB On-The-Go" (OTG) ... and this driver
supports it on at least "H2-like" boards.

Another reason is that the UDC is very flexible and fully featured;
gadget drivers can allocate fifo space to endpoints in the way that's
most convenient for the application.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

drivers/usb/gadget/Kconfig

@@ -175,6 +175,41 @@ config USB_DUMMY_HCD
 	depends on USB_GADGET_DUMMY_HCD
 	default USB_GADGET
 
+config USB_GADGET_OMAP
+	boolean "OMAP USB Device Controller"
+	depends on ARCH_OMAP
+	select ISP1301_OMAP if MACH_OMAP_H2
+	help
+	   Many Texas Instruments OMAP processors have flexible full
+	   speed USB device controllers, with support for up to 30
+	   endpoints (plus endpoint zero).  This driver supports the
+	   controller in the OMAP 1611, and should work with controllers
+	   in other OMAP processors too, given minor tweaks.
+
+	   Say "y" to link the driver statically, or "m" to build a
+	   dynamically linked module called "omap_udc" and force all
+	   gadget drivers to also be dynamically linked.
+
+config USB_OMAP
+	tristate
+	depends on USB_GADGET_OMAP
+	default USB_GADGET
+
+config USB_OTG
+	boolean "OTG Support"
+	depends on USB_GADGET_OMAP && ARCH_OMAP_OTG && USB_OHCI_HCD
+	help
+	   The most notable feature of USB OTG is support for a
+	   "Dual-Role" device, which can act as either a device
+	   or a host.  The initial role choice can be changed
+	   later, when two dual-role devices talk to each other.
+
+	   Select this only if your OMAP board has a Mini-AB connector.
+
+config USB_OMAP_PROC
+	boolean "/proc/driver/udc file"
+	depends on USB_GADGET_OMAP
+
 endchoice
 
 config USB_GADGET_DUALSPEED

drivers/usb/gadget/Makefile

@@ -5,6 +5,8 @@ obj-$(CONFIG_USB_DUMMY_HCD)	+= dummy_hcd.o
 obj-$(CONFIG_USB_NET2280)	+= net2280.o
 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
 
 #
 # USB gadget drivers

drivers/usb/gadget/omap_udc.h

+/*
+ * omap_udc.h -- for omap 3.2 udc, with OTG support
+ *
+ * 2004 (C) Texas Instruments, Inc.
+ * 2004 (C) David Brownell
+ */
+
+/*
+ * USB device/endpoint management registers
+ */
+#define UDC_REG(offset)              __REG16(UDC_BASE + (offset))
+
+#define	UDC_REV_REG			UDC_REG(0x0)	/* Revision */
+#define	UDC_EP_NUM_REG			UDC_REG(0x4)	/* Which endpoint */
+#	define	UDC_SETUP_SEL		(1 << 6)
+#	define	UDC_EP_SEL		(1 << 5)
+#	define	UDC_EP_DIR		(1 << 4)
+	/* low 4 bits for endpoint number */
+#define	UDC_DATA_REG			UDC_REG(0x08)	/* Endpoint FIFO */
+#define	UDC_CTRL_REG			UDC_REG(0x0C)	/* Endpoint control */
+#	define	UDC_CLR_HALT		(1 << 7)
+#	define	UDC_SET_HALT		(1 << 6)
+#	define	UDC_SET_FIFO_EN		(1 << 2)
+#	define	UDC_CLR_EP		(1 << 1)
+#	define	UDC_RESET_EP		(1 << 0)
+#define	UDC_STAT_FLG_REG		UDC_REG(0x10)	/* Endpoint status */
+#	define	UDC_NO_RXPACKET		(1 << 15)
+#	define	UDC_MISS_IN		(1 << 14)
+#	define	UDC_DATA_FLUSH		(1 << 13)
+#	define	UDC_ISO_ERR		(1 << 12)
+#	define	UDC_ISO_FIFO_EMPTY	(1 << 9)
+#	define	UDC_ISO_FIFO_FULL	(1 << 8)
+#	define	UDC_EP_HALTED		(1 << 6)
+#	define	UDC_STALL		(1 << 5)
+#	define	UDC_NAK			(1 << 4)
+#	define	UDC_ACK			(1 << 3)
+#	define	UDC_FIFO_EN		(1 << 2)
+#	define	UDC_NON_ISO_FIFO_EMPTY	(1 << 1)
+#	define	UDC_NON_ISO_FIFO_FULL	(1 << 0)
+#define	UDC_RXFSTAT_REG			UDC_REG(0x14)	/* OUT bytecount */
+#define	UDC_SYSCON1_REG			UDC_REG(0x18)	/* System config 1 */
+#	define	UDC_CFG_LOCK		(1 << 8)
+#	define	UDC_DATA_ENDIAN		(1 << 7)
+#	define	UDC_DMA_ENDIAN		(1 << 6)
+#	define	UDC_NAK_EN		(1 << 4)
+#	define	UDC_AUTODECODE_DIS	(1 << 3)
+#	define	UDC_SELF_PWR		(1 << 2)
+#	define	UDC_SOFF_DIS		(1 << 1)
+#	define	UDC_PULLUP_EN		(1 << 0)
+#define	UDC_SYSCON2_REG			UDC_REG(0x1C)	/* System config 2 */
+#	define	UDC_RMT_WKP		(1 << 6)
+#	define	UDC_STALL_CMD		(1 << 5)
+#	define	UDC_DEV_CFG		(1 << 3)
+#	define	UDC_CLR_CFG		(1 << 2)
+#define	UDC_DEVSTAT_REG			UDC_REG(0x20)	/* Device status */
+#	define	UDC_B_HNP_ENABLE	(1 << 9)
+#	define	UDC_A_HNP_SUPPORT	(1 << 8)
+#	define	UDC_A_ALT_HNP_SUPPORT	(1 << 7)
+#	define	UDC_R_WK_OK		(1 << 6)
+#	define	UDC_USB_RESET		(1 << 5)
+#	define	UDC_SUS			(1 << 4)
+#	define	UDC_CFG			(1 << 3)
+#	define	UDC_ADD			(1 << 2)
+#	define	UDC_DEF			(1 << 1)
+#	define	UDC_ATT			(1 << 0)
+#define	UDC_SOF_REG			UDC_REG(0x24)	/* Start of frame */
+#	define	UDC_FT_LOCK		(1 << 12)
+#	define	UDC_TS_OK		(1 << 11)
+#	define	UDC_TS			0x03ff
+#define	UDC_IRQ_EN_REG			UDC_REG(0x28)	/* Interrupt enable */
+#	define	UDC_SOF_IE		(1 << 7)
+#	define	UDC_EPN_RX_IE		(1 << 5)
+#	define	UDC_EPN_TX_IE		(1 << 4)
+#	define	UDC_DS_CHG_IE		(1 << 3)
+#	define	UDC_EP0_IE		(1 << 0)
+#define	UDC_DMA_IRQ_EN_REG		UDC_REG(0x2C)	/* DMA irq enable */
+	/* rx/tx dma channels numbered 1-3 not 0-2 */
+#	define	UDC_TX_DONE_IE(n)	(1 << (4 * (n) - 2))
+#	define	UDC_RX_CNT_IE(n)	(1 << (4 * (n) - 3))
+#	define	UDC_RX_EOT_IE(n)	(1 << (4 * (n) - 4))
+#define	UDC_IRQ_SRC_REG			UDC_REG(0x30)	/* Interrupt source */
+#	define	UDC_TXN_DONE		(1 << 10)
+#	define	UDC_RXN_CNT		(1 << 9)
+#	define	UDC_RXN_EOT		(1 << 8)
+#	define	UDC_SOF			(1 << 7)
+#	define	UDC_EPN_RX		(1 << 5)
+#	define	UDC_EPN_TX		(1 << 4)
+#	define	UDC_DS_CHG		(1 << 3)
+#	define	UDC_SETUP		(1 << 2)
+#	define	UDC_EP0_RX		(1 << 1)
+#	define	UDC_EP0_TX		(1 << 0)
+#	define	UDC_IRQ_SRC_MASK	0x7bf
+#define	UDC_EPN_STAT_REG		UDC_REG(0x34)	/* EP irq status */
+#define	UDC_DMAN_STAT_REG		UDC_REG(0x38)	/* DMA irq status */
+#	define	UDC_DMA_RX_SB		(1 << 12)
+#	define	UDC_DMA_RX_SRC(x)	(((x)>>8) & 0xf)
+#	define	UDC_DMA_TX_SRC(x)	(((x)>>0) & 0xf)
+
+
+/* DMA configuration registers:  up to three channels in each direction.  */
+#define	UDC_RXDMA_CFG_REG		UDC_REG(0x40)	/* 3 eps for RX DMA */
+#define	UDC_TXDMA_CFG_REG		UDC_REG(0x44)	/* 3 eps for TX DMA */
+#define	UDC_DATA_DMA_REG		UDC_REG(0x48)	/* rx/tx fifo addr */
+
+/* rx/tx dma control, numbering channels 1-3 not 0-2 */
+#define	UDC_TXDMA_REG(chan)		UDC_REG(0x50 - 4 + 4 * (chan))
+#	define UDC_TXN_EOT		(1 << 15)	/* bytes vs packets */
+#	define UDC_TXN_START		(1 << 14)	/* start transfer */
+#	define UDC_TXN_TSC		0x03ff		/* units in xfer */
+#define	UDC_RXDMA_REG(chan)		UDC_REG(0x60 - 4 + 4 * (chan))
+#	define UDC_RXN_STOP		(1 << 15)	/* enable EOT irq */
+#	define UDC_RXN_TC		0x00ff		/* packets in xfer */
+
+
+/*
+ * Endpoint configuration registers (used before CFG_LOCK is set)
+ * UDC_EP_TX_REG(0) is unused
+ */
+#define	UDC_EP_RX_REG(endpoint)		UDC_REG(0x80 + (endpoint)*4)
+#	define	UDC_EPN_RX_VALID	(1 << 15)
+#	define	UDC_EPN_RX_DB		(1 << 14)
+	/* buffer size in bits 13, 12 */
+#	define	UDC_EPN_RX_ISO		(1 << 11)
+	/* buffer pointer in low 11 bits */
+#define	UDC_EP_TX_REG(endpoint)		UDC_REG(0xc0 + (endpoint)*4)
+	/* same bitfields as in RX_REG */
+
+/*-------------------------------------------------------------------------*/
+
+struct omap_req {
+	struct usb_request		req;
+	struct list_head		queue;
+	unsigned			dma_bytes;
+	unsigned			mapped:1;
+};
+
+struct omap_ep {
+	struct usb_ep			ep;
+	struct list_head		queue;
+	unsigned long			irqs;
+	struct list_head		iso;
+	const struct usb_endpoint_descriptor	*desc;
+	char				name[14];
+	u16				maxpacket;
+	u8				bEndpointAddress;
+	u8				bmAttributes;
+	unsigned			double_buf:1;
+	unsigned			stopped:1;
+	unsigned			ackwait:1;
+	unsigned			has_dma:1;
+	u8				dma_channel;
+	int				lch;
+	struct omap_udc			*udc;
+};
+
+struct omap_udc {
+	struct usb_gadget		gadget;
+	struct usb_gadget_driver	*driver;
+	spinlock_t			lock;
+	struct omap_ep			ep[32];
+	u16				devstat;
+	struct otg_transceiver		*transceiver;
+	struct list_head		iso;
+	unsigned			softconnect:1;
+	unsigned			vbus_active:1;
+	unsigned			ep0_pending:1;
+	unsigned			ep0_in:1;
+	unsigned			ep0_set_config:1;
+	unsigned			ep0_reset_config:1;
+	unsigned			ep0_setup:1;
+	unsigned			hmc:6;
+
+	struct completion		*done;
+};
+
+/*-------------------------------------------------------------------------*/
+
+#ifdef DEBUG
+#define DBG(stuff...)		printk(KERN_DEBUG "udc: " stuff)
+#else
+#define DBG(stuff...)		do{}while(0)
+#endif
+
+#ifdef VERBOSE
+#    define VDBG		DBG
+#else
+#    define VDBG(stuff...)	do{}while(0)
+#endif
+
+#define ERR(stuff...)		printk(KERN_ERR "udc: " stuff)
+#define WARN(stuff...)		printk(KERN_WARNING "udc: " stuff)
+#define INFO(stuff...)		printk(KERN_INFO "udc: " stuff)
+
+/*-------------------------------------------------------------------------*/
+
+// #define	HMC_1510	((MOD_CONF_CTRL_0_REG >> 1) & 0x3f)
+#define	HMC_1610	(OTG_SYSCON_2_REG & 0x3f)
+#define	HMC		 HMC_1610
+