* each LUN would be settable independently as a disk drive or a CD-ROM
* drive, but currently all LUNs have to be the same type. The CD-ROM
* emulation includes a single data track and no audio tracks; hence there
- * need be only one backing file per LUN. Note also that the CD-ROM block
- * length is set to 512 rather than the more common value 2048.
+ * need be only one backing file per LUN.
*
* Requirements are modest; only a bulk-in and a bulk-out endpoint are
* needed (an interrupt-out endpoint is also needed for CBI). The memory
struct fsg_buffhd *next_buffhd_to_fill;
struct fsg_buffhd *next_buffhd_to_drain;
- struct fsg_buffhd buffhds[FSG_NUM_BUFFERS];
int thread_wakeup_needed;
struct completion thread_notifier;
unsigned int nluns;
struct fsg_lun *luns;
struct fsg_lun *curlun;
+ /* Must be the last entry */
+ struct fsg_buffhd buffhds[];
};
typedef void (*fsg_routine_t)(struct fsg_dev *);
u32 amount_left;
loff_t file_offset, file_offset_tmp;
unsigned int amount;
- unsigned int partial_page;
ssize_t nread;
/* Get the starting Logical Block Address and check that it's
curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
return -EINVAL;
}
- file_offset = ((loff_t) lba) << 9;
+ file_offset = ((loff_t) lba) << curlun->blkbits;
/* Carry out the file reads */
amount_left = fsg->data_size_from_cmnd;
* Try to read the remaining amount.
* But don't read more than the buffer size.
* And don't try to read past the end of the file.
- * Finally, if we're not at a page boundary, don't read past
- * the next page.
- * If this means reading 0 then we were asked to read past
- * the end of file. */
+ */
amount = min((unsigned int) amount_left, mod_data.buflen);
amount = min((loff_t) amount,
curlun->file_length - file_offset);
- partial_page = file_offset & (PAGE_CACHE_SIZE - 1);
- if (partial_page > 0)
- amount = min(amount, (unsigned int) PAGE_CACHE_SIZE -
- partial_page);
/* Wait for the next buffer to become available */
bh = fsg->next_buffhd_to_fill;
if (amount == 0) {
curlun->sense_data =
SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
- curlun->sense_data_info = file_offset >> 9;
+ curlun->sense_data_info = file_offset >> curlun->blkbits;
curlun->info_valid = 1;
bh->inreq->length = 0;
bh->state = BUF_STATE_FULL;
} else if (nread < amount) {
LDBG(curlun, "partial file read: %d/%u\n",
(int) nread, amount);
- nread -= (nread & 511); // Round down to a block
+ nread = round_down(nread, curlun->blksize);
}
file_offset += nread;
amount_left -= nread;
fsg->residue -= nread;
+
+ /* Except at the end of the transfer, nread will be
+ * equal to the buffer size, which is divisible by the
+ * bulk-in maxpacket size.
+ */
bh->inreq->length = nread;
bh->state = BUF_STATE_FULL;
/* If an error occurred, report it and its position */
if (nread < amount) {
curlun->sense_data = SS_UNRECOVERED_READ_ERROR;
- curlun->sense_data_info = file_offset >> 9;
+ curlun->sense_data_info = file_offset >> curlun->blkbits;
curlun->info_valid = 1;
break;
}
u32 amount_left_to_req, amount_left_to_write;
loff_t usb_offset, file_offset, file_offset_tmp;
unsigned int amount;
- unsigned int partial_page;
ssize_t nwritten;
int rc;
/* Carry out the file writes */
get_some_more = 1;
- file_offset = usb_offset = ((loff_t) lba) << 9;
+ file_offset = usb_offset = ((loff_t) lba) << curlun->blkbits;
amount_left_to_req = amount_left_to_write = fsg->data_size_from_cmnd;
while (amount_left_to_write > 0) {
if (bh->state == BUF_STATE_EMPTY && get_some_more) {
/* Figure out how much we want to get:
- * Try to get the remaining amount.
- * But don't get more than the buffer size.
- * And don't try to go past the end of the file.
- * If we're not at a page boundary,
- * don't go past the next page.
- * If this means getting 0, then we were asked
- * to write past the end of file.
- * Finally, round down to a block boundary. */
+ * Try to get the remaining amount,
+ * but not more than the buffer size.
+ */
amount = min(amount_left_to_req, mod_data.buflen);
- amount = min((loff_t) amount, curlun->file_length -
- usb_offset);
- partial_page = usb_offset & (PAGE_CACHE_SIZE - 1);
- if (partial_page > 0)
- amount = min(amount,
- (unsigned int) PAGE_CACHE_SIZE - partial_page);
-
- if (amount == 0) {
+
+ /* Beyond the end of the backing file? */
+ if (usb_offset >= curlun->file_length) {
get_some_more = 0;
curlun->sense_data =
SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
- curlun->sense_data_info = usb_offset >> 9;
+ curlun->sense_data_info = usb_offset >> curlun->blkbits;
curlun->info_valid = 1;
continue;
}
- amount -= (amount & 511);
- if (amount == 0) {
-
- /* Why were we were asked to transfer a
- * partial block? */
- get_some_more = 0;
- continue;
- }
/* Get the next buffer */
usb_offset += amount;
if (amount_left_to_req == 0)
get_some_more = 0;
- /* amount is always divisible by 512, hence by
- * the bulk-out maxpacket size */
+ /* Except at the end of the transfer, amount will be
+ * equal to the buffer size, which is divisible by
+ * the bulk-out maxpacket size.
+ */
bh->outreq->length = bh->bulk_out_intended_length =
amount;
bh->outreq->short_not_ok = 1;
/* Did something go wrong with the transfer? */
if (bh->outreq->status != 0) {
curlun->sense_data = SS_COMMUNICATION_FAILURE;
- curlun->sense_data_info = file_offset >> 9;
+ curlun->sense_data_info = file_offset >> curlun->blkbits;
curlun->info_valid = 1;
break;
}
amount = curlun->file_length - file_offset;
}
+ /* Don't write a partial block */
+ amount = round_down(amount, curlun->blksize);
+ if (amount == 0)
+ goto empty_write;
+
/* Perform the write */
file_offset_tmp = file_offset;
nwritten = vfs_write(curlun->filp,
} else if (nwritten < amount) {
LDBG(curlun, "partial file write: %d/%u\n",
(int) nwritten, amount);
- nwritten -= (nwritten & 511);
- // Round down to a block
+ nwritten = round_down(nwritten, curlun->blksize);
}
file_offset += nwritten;
amount_left_to_write -= nwritten;
/* If an error occurred, report it and its position */
if (nwritten < amount) {
curlun->sense_data = SS_WRITE_ERROR;
- curlun->sense_data_info = file_offset >> 9;
+ curlun->sense_data_info = file_offset >> curlun->blkbits;
curlun->info_valid = 1;
break;
}
+ empty_write:
/* Did the host decide to stop early? */
if (bh->outreq->actual != bh->outreq->length) {
fsg->short_packet_received = 1;
return -EIO; // No default reply
/* Prepare to carry out the file verify */
- amount_left = verification_length << 9;
- file_offset = ((loff_t) lba) << 9;
+ amount_left = verification_length << curlun->blkbits;
+ file_offset = ((loff_t) lba) << curlun->blkbits;
/* Write out all the dirty buffers before invalidating them */
fsg_lun_fsync_sub(curlun);
* Try to read the remaining amount, but not more than
* the buffer size.
* And don't try to read past the end of the file.
- * If this means reading 0 then we were asked to read
- * past the end of file. */
+ */
amount = min((unsigned int) amount_left, mod_data.buflen);
amount = min((loff_t) amount,
curlun->file_length - file_offset);
if (amount == 0) {
curlun->sense_data =
SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
- curlun->sense_data_info = file_offset >> 9;
+ curlun->sense_data_info = file_offset >> curlun->blkbits;
curlun->info_valid = 1;
break;
}
} else if (nread < amount) {
LDBG(curlun, "partial file verify: %d/%u\n",
(int) nread, amount);
- nread -= (nread & 511); // Round down to a sector
+ nread = round_down(nread, curlun->blksize);
}
if (nread == 0) {
curlun->sense_data = SS_UNRECOVERED_READ_ERROR;
- curlun->sense_data_info = file_offset >> 9;
+ curlun->sense_data_info = file_offset >> curlun->blkbits;
curlun->info_valid = 1;
break;
}
put_unaligned_be32(curlun->num_sectors - 1, &buf[0]);
/* Max logical block */
- put_unaligned_be32(512, &buf[4]); /* Block length */
+ put_unaligned_be32(curlun->blksize, &buf[4]); /* Block length */
return 8;
}
put_unaligned_be32(curlun->num_sectors, &buf[0]);
/* Number of blocks */
- put_unaligned_be32(512, &buf[4]); /* Block length */
+ put_unaligned_be32(curlun->blksize, &buf[4]); /* Block length */
buf[4] = 0x02; /* Current capacity */
return 12;
}
amount = min(fsg->usb_amount_left,
(u32) mod_data.buflen);
- /* amount is always divisible by 512, hence by
- * the bulk-out maxpacket size */
+ /* Except at the end of the transfer, amount will be
+ * equal to the buffer size, which is divisible by
+ * the bulk-out maxpacket size.
+ */
bh->outreq->length = bh->bulk_out_intended_length =
amount;
bh->outreq->short_not_ok = 1;
case READ_6:
i = fsg->cmnd[4];
- fsg->data_size_from_cmnd = (i == 0 ? 256 : i) << 9;
+ fsg->data_size_from_cmnd = (i == 0 ? 256 : i) << fsg->curlun->blkbits;
if ((reply = check_command(fsg, 6, DATA_DIR_TO_HOST,
(7<<1) | (1<<4), 1,
"READ(6)")) == 0)
case READ_10:
fsg->data_size_from_cmnd =
- get_unaligned_be16(&fsg->cmnd[7]) << 9;
+ get_unaligned_be16(&fsg->cmnd[7]) << fsg->curlun->blkbits;
if ((reply = check_command(fsg, 10, DATA_DIR_TO_HOST,
(1<<1) | (0xf<<2) | (3<<7), 1,
"READ(10)")) == 0)
case READ_12:
fsg->data_size_from_cmnd =
- get_unaligned_be32(&fsg->cmnd[6]) << 9;
+ get_unaligned_be32(&fsg->cmnd[6]) << fsg->curlun->blkbits;
if ((reply = check_command(fsg, 12, DATA_DIR_TO_HOST,
(1<<1) | (0xf<<2) | (0xf<<6), 1,
"READ(12)")) == 0)
case WRITE_6:
i = fsg->cmnd[4];
- fsg->data_size_from_cmnd = (i == 0 ? 256 : i) << 9;
+ fsg->data_size_from_cmnd = (i == 0 ? 256 : i) << fsg->curlun->blkbits;
if ((reply = check_command(fsg, 6, DATA_DIR_FROM_HOST,
(7<<1) | (1<<4), 1,
"WRITE(6)")) == 0)
case WRITE_10:
fsg->data_size_from_cmnd =
- get_unaligned_be16(&fsg->cmnd[7]) << 9;
+ get_unaligned_be16(&fsg->cmnd[7]) << fsg->curlun->blkbits;
if ((reply = check_command(fsg, 10, DATA_DIR_FROM_HOST,
(1<<1) | (0xf<<2) | (3<<7), 1,
"WRITE(10)")) == 0)
case WRITE_12:
fsg->data_size_from_cmnd =
- get_unaligned_be32(&fsg->cmnd[6]) << 9;
+ get_unaligned_be32(&fsg->cmnd[6]) << fsg->curlun->blkbits;
if ((reply = check_command(fsg, 12, DATA_DIR_FROM_HOST,
(1<<1) | (0xf<<2) | (0xf<<6), 1,
"WRITE(12)")) == 0)
reset:
/* Deallocate the requests */
- for (i = 0; i < FSG_NUM_BUFFERS; ++i) {
+ for (i = 0; i < fsg_num_buffers; ++i) {
struct fsg_buffhd *bh = &fsg->buffhds[i];
if (bh->inreq) {
}
/* Allocate the requests */
- for (i = 0; i < FSG_NUM_BUFFERS; ++i) {
+ for (i = 0; i < fsg_num_buffers; ++i) {
struct fsg_buffhd *bh = &fsg->buffhds[i];
if ((rc = alloc_request(fsg, fsg->bulk_in, &bh->inreq)) != 0)
fsg->config = new_config;
if ((rc = do_set_interface(fsg, 0)) != 0)
fsg->config = 0; // Reset on errors
- else {
- char *speed;
-
- switch (fsg->gadget->speed) {
- case USB_SPEED_LOW: speed = "low"; break;
- case USB_SPEED_FULL: speed = "full"; break;
- case USB_SPEED_HIGH: speed = "high"; break;
- default: speed = "?"; break;
- }
- INFO(fsg, "%s speed config #%d\n", speed, fsg->config);
- }
+ else
+ INFO(fsg, "%s config #%d\n",
+ usb_speed_string(fsg->gadget->speed),
+ fsg->config);
}
return rc;
}
/* Cancel all the pending transfers */
if (fsg->intreq_busy)
usb_ep_dequeue(fsg->intr_in, fsg->intreq);
- for (i = 0; i < FSG_NUM_BUFFERS; ++i) {
+ for (i = 0; i < fsg_num_buffers; ++i) {
bh = &fsg->buffhds[i];
if (bh->inreq_busy)
usb_ep_dequeue(fsg->bulk_in, bh->inreq);
/* Wait until everything is idle */
for (;;) {
num_active = fsg->intreq_busy;
- for (i = 0; i < FSG_NUM_BUFFERS; ++i) {
+ for (i = 0; i < fsg_num_buffers; ++i) {
bh = &fsg->buffhds[i];
num_active += bh->inreq_busy + bh->outreq_busy;
}
* state, and the exception. Then invoke the handler. */
spin_lock_irq(&fsg->lock);
- for (i = 0; i < FSG_NUM_BUFFERS; ++i) {
+ for (i = 0; i < fsg_num_buffers; ++i) {
bh = &fsg->buffhds[i];
bh->state = BUF_STATE_EMPTY;
}
}
/* Free the data buffers */
- for (i = 0; i < FSG_NUM_BUFFERS; ++i)
+ for (i = 0; i < fsg_num_buffers; ++i)
kfree(fsg->buffhds[i].buf);
/* Free the request and buffer for endpoint 0 */
req->complete = ep0_complete;
/* Allocate the data buffers */
- for (i = 0; i < FSG_NUM_BUFFERS; ++i) {
+ for (i = 0; i < fsg_num_buffers; ++i) {
struct fsg_buffhd *bh = &fsg->buffhds[i];
/* Allocate for the bulk-in endpoint. We assume that
goto out;
bh->next = bh + 1;
}
- fsg->buffhds[FSG_NUM_BUFFERS - 1].next = &fsg->buffhds[0];
+ fsg->buffhds[fsg_num_buffers - 1].next = &fsg->buffhds[0];
/* This should reflect the actual gadget power source */
usb_gadget_set_selfpowered(gadget);
{
struct fsg_dev *fsg;
- fsg = kzalloc(sizeof *fsg, GFP_KERNEL);
+ fsg = kzalloc(sizeof *fsg +
+ fsg_num_buffers * sizeof *(fsg->buffhds), GFP_KERNEL);
+
if (!fsg)
return -ENOMEM;
spin_lock_init(&fsg->lock);
int rc;
struct fsg_dev *fsg;
+ rc = fsg_num_buffers_validate();
+ if (rc != 0)
+ return rc;
+
if ((rc = fsg_alloc()) != 0)
return rc;
fsg = the_fsg;
* 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
*/
* characters rather then a pointer to void.
*/
+ /*
+ * When USB_GADGET_DEBUG_FILES is defined the module param num_buffers
+ * sets the number of pipeline buffers (length of the fsg_buffhd array).
+ * The valid range of num_buffers is: num >= 2 && num <= 4.
+ */
+
#include <linux/usb/storage.h>
#include <scsi/scsi.h>
u32 sense_data_info;
u32 unit_attention_data;
+ unsigned int blkbits; /* Bits of logical block size of bound block device */
+ unsigned int blksize; /* logical block size of bound block device */
struct device dev;
};
#define EP0_BUFSIZE 256
#define DELAYED_STATUS (EP0_BUFSIZE + 999) /* An impossibly large value */
- /* Number of buffers we will use. 2 is enough for double-buffering */
- #define FSG_NUM_BUFFERS 2
+ #ifdef CONFIG_USB_GADGET_DEBUG_FILES
+
+ static unsigned int fsg_num_buffers = CONFIG_USB_GADGET_STORAGE_NUM_BUFFERS;
+ module_param_named(num_buffers, fsg_num_buffers, uint, S_IRUGO);
+ MODULE_PARM_DESC(num_buffers, "Number of pipeline buffers");
+
+ #else
+
+ /*
+ * Number of buffers we will use.
+ * 2 is usually enough for good buffering pipeline
+ */
+ #define fsg_num_buffers CONFIG_USB_GADGET_STORAGE_NUM_BUFFERS
+
+ #endif /* CONFIG_USB_DEBUG */
+
+ /* check if fsg_num_buffers is within a valid range */
+ static inline int fsg_num_buffers_validate(void)
+ {
+ if (fsg_num_buffers >= 2 && fsg_num_buffers <= 4)
+ return 0;
+ pr_err("fsg_num_buffers %u is out of range (%d to %d)\n",
+ fsg_num_buffers, 2 ,4);
+ return -EINVAL;
+ }
/* Default size of buffer length. */
#define FSG_BUFLEN ((u32)16384)
rc = (int) size;
goto out;
}
- num_sectors = size >> 9; /* File size in 512-byte blocks */
+
+ if (curlun->cdrom) {
+ curlun->blksize = 2048;
+ curlun->blkbits = 11;
+ } else if (inode->i_bdev) {
+ curlun->blksize = bdev_logical_block_size(inode->i_bdev);
+ curlun->blkbits = blksize_bits(curlun->blksize);
+ } else {
+ curlun->blksize = 512;
+ curlun->blkbits = 9;
+ }
+
+ num_sectors = size >> curlun->blkbits; /* File size in logic-block-size blocks */
min_sectors = 1;
if (curlun->cdrom) {
- num_sectors &= ~3; /* Reduce to a multiple of 2048 */
- min_sectors = 300*4; /* Smallest track is 300 frames */
- if (num_sectors >= 256*60*75*4) {
- num_sectors = (256*60*75 - 1) * 4;
+ min_sectors = 300; /* Smallest track is 300 frames */
+ if (num_sectors >= 256*60*75) {
+ num_sectors = 256*60*75 - 1;
LINFO(curlun, "file too big: %s\n", filename);
LINFO(curlun, "using only first %d blocks\n",
(int) num_sectors);
u16 len;
u16 csr = musb_readw(epio, MUSB_RXCSR);
struct musb_hw_ep *hw_ep = &musb->endpoints[epnum];
+ u8 use_mode_1;
if (hw_ep->is_shared_fifo)
musb_ep = &hw_ep->ep_in;
if (csr & MUSB_RXCSR_RXPKTRDY) {
len = musb_readw(epio, MUSB_RXCOUNT);
+
+ /*
+ * Enable Mode 1 on RX transfers only when short_not_ok flag
+ * is set. Currently short_not_ok flag is set only from
+ * file_storage and f_mass_storage drivers
+ */
+
+ if (request->short_not_ok && len == musb_ep->packet_sz)
+ use_mode_1 = 1;
+ else
+ use_mode_1 = 0;
+
if (request->actual < request->length) {
#ifdef CONFIG_USB_INVENTRA_DMA
if (is_buffer_mapped(req)) {
* then becomes usable as a runtime "use mode 1" hint...
*/
- csr |= MUSB_RXCSR_DMAENAB;
- #ifdef USE_MODE1
- csr |= MUSB_RXCSR_AUTOCLEAR;
- /* csr |= MUSB_RXCSR_DMAMODE; */
-
- /* this special sequence (enabling and then
- * disabling MUSB_RXCSR_DMAMODE) is required
- * to get DMAReq to activate
- */
- musb_writew(epio, MUSB_RXCSR,
- csr | MUSB_RXCSR_DMAMODE);
- #else
- if (!musb_ep->hb_mult &&
- musb_ep->hw_ep->rx_double_buffered)
+ /* Experimental: Mode1 works with mass storage use cases */
+ if (use_mode_1) {
csr |= MUSB_RXCSR_AUTOCLEAR;
- #endif
- musb_writew(epio, MUSB_RXCSR, csr);
+ musb_writew(epio, MUSB_RXCSR, csr);
+ csr |= MUSB_RXCSR_DMAENAB;
+ musb_writew(epio, MUSB_RXCSR, csr);
+
+ /*
+ * this special sequence (enabling and then
+ * disabling MUSB_RXCSR_DMAMODE) is required
+ * to get DMAReq to activate
+ */
+ musb_writew(epio, MUSB_RXCSR,
+ csr | MUSB_RXCSR_DMAMODE);
+ musb_writew(epio, MUSB_RXCSR, csr);
+
+ } else {
+ if (!musb_ep->hb_mult &&
+ musb_ep->hw_ep->rx_double_buffered)
+ csr |= MUSB_RXCSR_AUTOCLEAR;
+ csr |= MUSB_RXCSR_DMAENAB;
+ musb_writew(epio, MUSB_RXCSR, csr);
+ }
if (request->actual < request->length) {
int transfer_size = 0;
- #ifdef USE_MODE1
- transfer_size = min(request->length - request->actual,
- channel->max_len);
- #else
- transfer_size = min(request->length - request->actual,
- (unsigned)len);
- #endif
- if (transfer_size <= musb_ep->packet_sz)
- musb_ep->dma->desired_mode = 0;
- else
+ if (use_mode_1) {
+ transfer_size = min(request->length - request->actual,
+ channel->max_len);
musb_ep->dma->desired_mode = 1;
+ } else {
+ transfer_size = min(request->length - request->actual,
+ (unsigned)len);
+ musb_ep->dma->desired_mode = 0;
+ }
use_dma = c->channel_program(
channel,
return 0;
err:
+ musb->g.dev.parent = NULL;
device_unregister(&musb->g.dev);
return status;
}
void musb_gadget_cleanup(struct musb *musb)
{
usb_del_gadget_udc(&musb->g);
- device_unregister(&musb->g.dev);
+ if (musb->g.dev.parent)
+ device_unregister(&musb->g.dev);
}
/*
projects / karo-tx-linux.git / commitdiff