Commit bae4bd84 authored by David Brownell's avatar David Brownell Committed by Greg Kroah-Hartman
Browse files

[PATCH] USB: add support for AT91 gadget 



This adds support for the USB peripheral controller on AT91
(rm9200, eventually also sam9261 or uClinux) platforms.

More SOC support for Linux-USB ... an uncomplicated pure PIO driver.
It'd be worth using this as a model, if you're starting a driver
for some other peripheral controller.

Signed-off-by: default avatarDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 39a269c0

drivers/usb/gadget/Kconfig

+17 −0
Original line number Diff line number Diff line
@@ -187,6 +187,23 @@ config USB_OTG 


	   Select this only if your OMAP board has a Mini-AB connector.



config USB_GADGET_AT91

	boolean "AT91 USB Device Port"

	depends on ARCH_AT91RM9200

	select USB_GADGET_SELECTED

	help

	   Many Atmel AT91 processors (such as the AT91RM2000) have a

	   full speed USB Device Port with support for five configurable

	   endpoints (plus endpoint zero).



	   Say "y" to link the driver statically, or "m" to build a

	   dynamically linked module called "at91_udc" and force all

	   gadget drivers to also be dynamically linked.



config USB_AT91

	tristate

	depends on USB_GADGET_AT91

	default USB_GADGET



config USB_GADGET_DUMMY_HCD

	boolean "Dummy HCD (DEVELOPMENT)"

drivers/usb/gadget/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -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_AT91)		+= at91_udc.o



#

# USB gadget drivers

drivers/usb/gadget/at91_udc.c

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+1773 −0

File added.

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drivers/usb/gadget/at91_udc.h

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Original line number Diff line number Diff line 
/*

 * Copyright (C) 2004 by Thomas Rathbone, HP Labs

 * Copyright (C) 2005 by Ivan Kokshaysky

 * Copyright (C) 2006 by SAN People

 *

 * 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 AT91_UDC_H

#define AT91_UDC_H



/*

 * USB Device Port (UDP) registers.

 * Based on AT91RM9200 datasheet revision E.

 */



#define AT91_UDP_FRM_NUM	0x00		/* Frame Number Register */

#define     AT91_UDP_NUM	(0x7ff <<  0)	/* Frame Number */

#define     AT91_UDP_FRM_ERR	(1     << 16)	/* Frame Error */

#define     AT91_UDP_FRM_OK	(1     << 17)	/* Frame OK */



#define AT91_UDP_GLB_STAT	0x04		/* Global State Register */

#define     AT91_UDP_FADDEN	(1 <<  0)	/* Function Address Enable */

#define     AT91_UDP_CONFG	(1 <<  1)	/* Configured */

#define     AT91_UDP_ESR	(1 <<  2)	/* Enable Send Resume */

#define     AT91_UDP_RSMINPR	(1 <<  3)	/* Resume has been sent */

#define     AT91_UDP_RMWUPE	(1 <<  4)	/* Remote Wake Up Enable */



#define AT91_UDP_FADDR		0x08		/* Function Address Register */

#define     AT91_UDP_FADD	(0x7f << 0)	/* Function Address Value */

#define     AT91_UDP_FEN	(1    << 8)	/* Function Enable */



#define AT91_UDP_IER		0x10		/* Interrupt Enable Register */

#define AT91_UDP_IDR		0x14		/* Interrupt Disable Register */

#define AT91_UDP_IMR		0x18		/* Interrupt Mask Register */



#define AT91_UDP_ISR		0x1c		/* Interrupt Status Register */

#define     AT91_UDP_EP(n)	(1 << (n))	/* Endpoint Interrupt Status */

#define     AT91_UDP_RXSUSP	(1 <<  8) 	/* USB Suspend Interrupt Status */

#define     AT91_UDP_RXRSM	(1 <<  9)	/* USB Resume Interrupt Status */

#define     AT91_UDP_EXTRSM	(1 << 10)	/* External Resume Interrupt Status */

#define     AT91_UDP_SOFINT	(1 << 11)	/* Start of Frame Interrupt Status */

#define     AT91_UDP_ENDBUSRES	(1 << 12)	/* End of Bus Reset Interrpt Status */

#define     AT91_UDP_WAKEUP	(1 << 13)	/* USB Wakeup Interrupt Status */



#define AT91_UDP_ICR		0x20		/* Interrupt Clear Register */

#define AT91_UDP_RST_EP		0x28		/* Reset Endpoint Register */



#define AT91_UDP_CSR(n)		(0x30+((n)*4))	/* Endpoint Control/Status Registers 0-7 */

#define     AT91_UDP_TXCOMP	(1 <<  0)	/* Generates IN packet with data previously written in DPR */

#define     AT91_UDP_RX_DATA_BK0 (1 <<  1)	/* Receive Data Bank 0 */

#define     AT91_UDP_RXSETUP	(1 <<  2)	/* Send STALL to the host */

#define     AT91_UDP_STALLSENT	(1 <<  3)	/* Stall Sent / Isochronous error (Isochronous endpoints) */

#define     AT91_UDP_TXPKTRDY	(1 <<  4)	/* Transmit Packet Ready */

#define     AT91_UDP_FORCESTALL	(1 <<  5)	/* Force Stall */

#define     AT91_UDP_RX_DATA_BK1 (1 <<  6)	/* Receive Data Bank 1 */

#define     AT91_UDP_DIR	(1 <<  7)	/* Transfer Direction */

#define     AT91_UDP_EPTYPE	(7 <<  8)	/* Endpoint Type */

#define		AT91_UDP_EPTYPE_CTRL		(0 <<  8)

#define		AT91_UDP_EPTYPE_ISO_OUT		(1 <<  8)

#define		AT91_UDP_EPTYPE_BULK_OUT	(2 <<  8)

#define		AT91_UDP_EPTYPE_INT_OUT		(3 <<  8)

#define		AT91_UDP_EPTYPE_ISO_IN		(5 <<  8)

#define		AT91_UDP_EPTYPE_BULK_IN		(6 <<  8)

#define		AT91_UDP_EPTYPE_INT_IN		(7 <<  8)

#define     AT91_UDP_DTGLE	(1 << 11)	/* Data Toggle */

#define     AT91_UDP_EPEDS	(1 << 15)	/* Endpoint Enable/Disable */

#define     AT91_UDP_RXBYTECNT	(0x7ff << 16)	/* Number of bytes in FIFO */



#define AT91_UDP_FDR(n)		(0x50+((n)*4))	/* Endpoint FIFO Data Registers 0-7 */



#define AT91_UDP_TXVC		0x74		/* Transceiver Control Register */

#define     AT91_UDP_TXVC_TXVDIS (1 << 8)	/* Transceiver Disable */





/*-------------------------------------------------------------------------*/



/*

 * controller driver data structures

 */



#define	NUM_ENDPOINTS	6



/*

 * hardware won't disable bus reset, or resume while the controller

 * is suspended ... watching suspend helps keep the logic symmetric.

 */

#define	MINIMUS_INTERRUPTUS \

	(AT91_UDP_ENDBUSRES | AT91_UDP_RXRSM | AT91_UDP_RXSUSP)



struct at91_ep {

	struct usb_ep			ep;

	struct list_head		queue;

	struct at91_udc			*udc;

	void __iomem			*creg;



	unsigned			maxpacket:16;

	u8				int_mask;

	unsigned			is_pingpong:1;



	unsigned			stopped:1;

	unsigned			is_in:1;

	unsigned			is_iso:1;

	unsigned			fifo_bank:1;



	const struct usb_endpoint_descriptor

					*desc;

};



/*

 * driver is non-SMP, and just blocks IRQs whenever it needs

 * access protection for chip registers or driver state

 */

struct at91_udc {

	struct usb_gadget		gadget;

	struct at91_ep			ep[NUM_ENDPOINTS];

	struct usb_gadget_driver	*driver;

	unsigned			vbus:1;

	unsigned			enabled:1;

	unsigned			clocked:1;

	unsigned			suspended:1;

	unsigned			req_pending:1;

	unsigned			wait_for_addr_ack:1;

	unsigned			wait_for_config_ack:1;

	unsigned			selfpowered:1;

	u8				addr;

	struct at91_udc_data		board;

	struct clk			*iclk, *fclk;

	struct platform_device		*pdev;

	struct proc_dir_entry		*pde;

};



static inline struct at91_udc *to_udc(struct usb_gadget *g)

{

	return container_of(g, struct at91_udc, gadget);

}



struct at91_request {

	struct usb_request		req;

	struct list_head		queue;

};



/*-------------------------------------------------------------------------*/



#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



#ifdef PACKET_TRACE

#    define PACKET		VDBG

#else

#    define PACKET(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)



#endif

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