usb_storage.c

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/*
 * (C) Copyright 2001
 * Denis Peter, MPL AG Switzerland
 *
 * For BBB support (C) Copyright 2003
 * Gary Jennejohn, DENX Software Engineering <[e-mail]>
 *
 * Most of this source has been derived from the Linux USB
 * project. BBB support based on /sys/dev/usb/umass.c from
 * FreeBSD.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * 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
 *
 */

/* Note:
 * Currently only the CBI transport protocoll has been implemented, and it
 * is only tested with a TEAC USB Floppy. Other Massstorages with CBI or CB
 * transport protocoll may work as well.
 */
/*
 * New Note:
 * Support for USB Mass Storage Devices (BBB) has been added. It has
 * only been tested with USB memory sticks.
 * Nota bene: if you are using the BBB support with a little-endian
 * CPU then you MUST define LITTLEENDIAN in the configuration file!
 */


#include <common.h>
#include <command.h>
#include <asm/processor.h>


#if (CONFIG_COMMANDS & CFG_CMD_USB)
#include <usb.h>

#ifdef CONFIG_USB_STORAGE

#undef USB_STOR_DEBUG
#undef BBB_COMDAT_TRACE
#undef BBB_XPORT_TRACE

#ifdef	USB_STOR_DEBUG
#define USB_STOR_PRINTF(fmt,args...)	printf (fmt ,##args)
#else
#define USB_STOR_PRINTF(fmt,args...)
#endif

#include <scsi.h>
/* direction table -- this indicates the direction of the data
 * transfer for each command code -- a 1 indicates input
 */
unsigned char us_direction[256/8] = {
	0x28, 0x81, 0x14, 0x14, 0x20, 0x01, 0x90, 0x77,
	0x0C, 0x20, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x01,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
#define US_DIRECTION(x) ((us_direction[x>>3] >> (x & 7)) & 1)

static unsigned char usb_stor_buf[512];
static ccb usb_ccb;

/*
 * CBI style
 */

#define US_CBI_ADSC		0

/*
 * BULK only
 */
#define US_BBB_RESET		0xff
#define US_BBB_GET_MAX_LUN	0xfe

/* Command Block Wrapper */
typedef struct {
	__u32		dCBWSignature;
#	define CBWSIGNATURE	0x43425355
	__u32		dCBWTag;
	__u32		dCBWDataTransferLength;
	__u8		bCBWFlags;
#	define CBWFLAGS_OUT	0x00
#	define CBWFLAGS_IN	0x80
	__u8		bCBWLUN;
	__u8		bCDBLength;
#	define CBWCDBLENGTH	16
	__u8		CBWCDB[CBWCDBLENGTH];
} umass_bbb_cbw_t;
#define UMASS_BBB_CBW_SIZE	31
static __u32 CBWTag = 0;

/* Command Status Wrapper */
typedef struct {
	__u32		dCSWSignature;
#	define CSWSIGNATURE	0x53425355
	__u32		dCSWTag;
	__u32		dCSWDataResidue;
	__u8		bCSWStatus;
#	define CSWSTATUS_GOOD	0x0
#	define CSWSTATUS_FAILED 0x1
#	define CSWSTATUS_PHASE	0x2
} umass_bbb_csw_t;
#define UMASS_BBB_CSW_SIZE	13

#define USB_MAX_STOR_DEV 5
static int usb_max_devs; /* number of highest available usb device */

static block_dev_desc_t usb_dev_desc[USB_MAX_STOR_DEV];

struct us_data;
typedef int (*trans_cmnd)(ccb*, struct us_data*);
typedef int (*trans_reset)(struct us_data*);

struct us_data {
	struct usb_device	*pusb_dev;	 /* this usb_device */
	unsigned int		flags;		 /* from filter initially */
	unsigned char		ifnum;		 /* interface number */
	unsigned char		ep_in;		 /* in endpoint */
	unsigned char		ep_out;		 /* out ....... */
	unsigned char		ep_int;		 /* interrupt . */
	unsigned char		subclass;	 /* as in overview */
	unsigned char		protocol;	 /* .............. */
	unsigned char		attention_done;	 /* force attn on first cmd */
	unsigned short	ip_data;	 /* interrupt data */
	int							action;		 /* what to do */
	int							ip_wanted; /* needed */
	int							*irq_handle;	 /* for USB int requests */
	unsigned int		irqpipe;	 /* pipe for release_irq */
	unsigned char		irqmaxp;	/* max packed for irq Pipe */
	unsigned char	irqinterval; /* Intervall for IRQ Pipe */
	ccb							*srb;		 /* current srb */
	trans_reset			transport_reset; /* reset routine */
	trans_cmnd			transport; /* transport routine */
};

static struct us_data usb_stor[USB_MAX_STOR_DEV];


#define USB_STOR_TRANSPORT_GOOD	   0
#define USB_STOR_TRANSPORT_FAILED -1
#define USB_STOR_TRANSPORT_ERROR  -2


int usb_stor_get_info(struct usb_device *dev, struct us_data *us, block_dev_desc_t *dev_desc);
int usb_storage_probe(struct usb_device *dev, unsigned int ifnum,struct us_data *ss);
unsigned long usb_stor_read(int device, unsigned long blknr, unsigned long blkcnt, unsigned long *buffer);
struct usb_device * usb_get_dev_index(int index);
void uhci_show_temp_int_td(void);

block_dev_desc_t *usb_stor_get_dev(int index)
{
	return &usb_dev_desc[index];
}


void usb_show_progress(void)
{
	printf(".");
}

/*********************************************************************************
 * (re)-scan the usb and reports device info
 * to the user if mode = 1
 * returns current device or -1 if no
 */
int usb_stor_scan(int mode)
{
	unsigned char i;
	struct usb_device *dev;

	/* GJ */
	memset(usb_stor_buf, 0, sizeof(usb_stor_buf));

	if(mode==1) {
		printf("       scanning bus for storage devices...\n");
	}
	usb_disable_asynch(1); /* asynch transfer not allowed */

	for(i=0;i<USB_MAX_STOR_DEV;i++) {
		memset(&usb_dev_desc[i],0,sizeof(block_dev_desc_t));
		usb_dev_desc[i].target=0xff;
		usb_dev_desc[i].if_type=IF_TYPE_USB;
		usb_dev_desc[i].dev=i;
		usb_dev_desc[i].part_type=PART_TYPE_UNKNOWN;
		usb_dev_desc[i].block_read=usb_stor_read;
	}
	usb_max_devs=0;
	for(i=0;i<USB_MAX_DEVICE;i++) {
		dev=usb_get_dev_index(i); /* get device */
		USB_STOR_PRINTF("i=%d\n",i);
		if(dev==NULL) {
			break; /* no more devices avaiable */
		}
		if(usb_storage_probe(dev,0,&usb_stor[usb_max_devs])) { /* ok, it is a storage devices */
			/* get info and fill it in */

			if(usb_stor_get_info(dev, &usb_stor[usb_max_devs], &usb_dev_desc[usb_max_devs])) {
				if(mode==1) {
					printf ("  Device %d: ", usb_max_devs);
					dev_print(&usb_dev_desc[usb_max_devs]);
				} /* if mode */
				usb_max_devs++;
			} /* if get info ok */
		} /* if storage device */
		if(usb_max_devs==USB_MAX_STOR_DEV) {
			printf("max USB Storage Device reached: %d stopping\n",usb_max_devs);
			break;
		}
	} /* for */
	usb_disable_asynch(0); /* asynch transfer allowed */
	if(usb_max_devs>0)
		return 0;
	else
		return-1;
}

static int usb_stor_irq(struct usb_device *dev)
{
	struct us_data *us;
	us=(struct us_data *)dev->privptr;

	if(us->ip_wanted) {
		us->ip_wanted=0;
	}
	return 0;
}


#ifdef	USB_STOR_DEBUG

static void usb_show_srb(ccb * pccb)
{
	int i;
	printf("SRB: len %d datalen 0x%lX\n ",pccb->cmdlen,pccb->datalen);
	for(i=0;i<12;i++) {
		printf("%02X ",pccb->cmd[i]);
	}
	printf("\n");
}

static void display_int_status(unsigned long tmp)
{
	printf("Status: %s %s %s %s %s %s %s\n",
		(tmp & USB_ST_ACTIVE) ? "Active" : "",
		(tmp & USB_ST_STALLED) ? "Stalled" : "",
		(tmp & USB_ST_BUF_ERR) ? "Buffer Error" : "",
		(tmp & USB_ST_BABBLE_DET) ? "Babble Det" : "",
		(tmp & USB_ST_NAK_REC) ? "NAKed" : "",
		(tmp & USB_ST_CRC_ERR) ? "CRC Error" : "",
		(tmp & USB_ST_BIT_ERR) ? "Bitstuff Error" : "");
}
#endif
/***********************************************************************
 * Data transfer routines
 ***********************************************************************/

static int us_one_transfer(struct us_data *us, int pipe, char *buf, int length)
{
	int max_size;
	int this_xfer;
	int result;
	int partial;
	int maxtry;
	int stat;

	/* determine the maximum packet size for these transfers */
	max_size = usb_maxpacket(us->pusb_dev, pipe) * 16;

	/* while we have data left to transfer */
	while (length) {

		/* calculate how long this will be -- maximum or a remainder */
		this_xfer = length > max_size ? max_size : length;
		length -= this_xfer;

		/* setup the retry counter */
		maxtry = 10;

		/* set up the transfer loop */
		do {
			/* transfer the data */
			USB_STOR_PRINTF("Bulk xfer 0x%x(%d) try #%d\n",
				  (unsigned int)buf, this_xfer, 11 - maxtry);
			result = usb_bulk_msg(us->pusb_dev, pipe, buf,
					      this_xfer, &partial, USB_CNTL_TIMEOUT*5);
			USB_STOR_PRINTF("bulk_msg returned %d xferred %d/%d\n",
				  result, partial, this_xfer);
			if(us->pusb_dev->status!=0) {
				/* if we stall, we need to clear it before we go on */
#ifdef USB_STOR_DEBUG
				display_int_status(us->pusb_dev->status);
#endif
				if (us->pusb_dev->status & USB_ST_STALLED) {
					USB_STOR_PRINTF("stalled ->clearing endpoint halt for pipe 0x%x\n", pipe);
					stat = us->pusb_dev->status;
					usb_clear_halt(us->pusb_dev, pipe);
					us->pusb_dev->status=stat;
					if(this_xfer == partial) {
						USB_STOR_PRINTF("bulk transferred with error %X, but data ok\n",us->pusb_dev->status);
						return 0;
					}
					else
						return result;
				}
				if (us->pusb_dev->status & USB_ST_NAK_REC) {
					USB_STOR_PRINTF("Device NAKed bulk_msg\n");
					return result;
				}
				if(this_xfer == partial) {
					USB_STOR_PRINTF("bulk transferred with error %d, but data ok\n",us->pusb_dev->status);
					return 0;
				}
				/* if our try counter reaches 0, bail out */
				USB_STOR_PRINTF("bulk transferred with error %d, data %d\n",us->pusb_dev->status,partial);
				if (!maxtry--)
						return result;
			}
			/* update to show what data was transferred */
			this_xfer -= partial;
			buf += partial;
			/* continue until this transfer is done */
		} while ( this_xfer );
	}

	/* if we get here, we're done and successful */
	return 0;
}

static int usb_stor_BBB_reset(struct us_data *us)
{
	int result;
	unsigned int pipe;

	/*
	 * Reset recovery (5.3.4 in Universal Serial Bus Mass Storage Class)
	 *
	 * For Reset Recovery the host shall issue in the following order:
	 * a) a Bulk-Only Mass Storage Reset
	 * b) a Clear Feature HALT to the Bulk-In endpoint
	 * c) a Clear Feature HALT to the Bulk-Out endpoint
	 *
	 * This is done in 3 steps.
	 *
	 * If the reset doesn't succeed, the device should be port reset.
	 *
	 * This comment stolen from FreeBSD's /sys/dev/usb/umass.c.
	 */
	USB_STOR_PRINTF("BBB_reset\n");
	result = usb_control_msg(us->pusb_dev, usb_sndctrlpipe(us->pusb_dev,0),
				 US_BBB_RESET, USB_TYPE_CLASS | USB_RECIP_INTERFACE,
				 0, us->ifnum, 0, 0, USB_CNTL_TIMEOUT*5);
	if((result < 0) && (us->pusb_dev->status & USB_ST_STALLED))
	{
		USB_STOR_PRINTF("RESET:stall\n");
		return -1;
	}
	/* long wait for reset */
	wait_ms(150);
	USB_STOR_PRINTF("BBB_reset result %d: status %X reset\n",result,us->pusb_dev->status);
	pipe = usb_rcvbulkpipe(us->pusb_dev, us->ep_in);
	result = usb_clear_halt(us->pusb_dev, pipe);
	/* long wait for reset */
	wait_ms(150);
	USB_STOR_PRINTF("BBB_reset result %d: status %X clearing IN endpoint\n",result,us->pusb_dev->status);
	/* long wait for reset */
	pipe = usb_sndbulkpipe(us->pusb_dev, us->ep_out);
	result = usb_clear_halt(us->pusb_dev, pipe);
	wait_ms(150);
	USB_STOR_PRINTF("BBB_reset result %d: status %X clearing OUT endpoint\n",result,us->pusb_dev->status);
	USB_STOR_PRINTF("BBB_reset done\n");
	return 0;
}

/* FIXME: this reset function doesn't really reset the port, and it
 * should. Actually it should probably do what it's doing here, and
 * reset the port physically
 */
static int usb_stor_CB_reset(struct us_data *us)