/* Driver for Freecom USB/IDE adaptor * * $Id: freecom.c,v 1.22 2002/04/22 03:39:43 mdharm Exp $ * * Freecom v0.1: * * First release * * Current development and maintenance by: * (C) 2000 David Brown <usb-storage@davidb.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, 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., * 675 Mass Ave, Cambridge, MA 02139, USA. * * This driver was developed with information provided in FREECOM's USB * Programmers Reference Guide. For further information contact Freecom * (http://www.freecom.de/) */ #include <linux/hdreg.h> #include <scsi/scsi.h> #include <scsi/scsi_cmnd.h> #include "usb.h" #include "transport.h" #include "protocol.h" #include "debug.h" #include "freecom.h" #ifdef CONFIG_USB_STORAGE_DEBUG static void pdump (void *, int); #endif /* Bits of HD_STATUS */ #define ERR_STAT 0x01 #define DRQ_STAT 0x08 /* All of the outgoing packets are 64 bytes long. */ struct freecom_cb_wrap { u8 Type; /* Command type. */ u8 Timeout; /* Timeout in seconds. */ u8 Atapi[12]; /* An ATAPI packet. */ u8 Filler[50]; /* Padding Data. */ }; struct freecom_xfer_wrap { u8 Type; /* Command type. */ u8 Timeout; /* Timeout in seconds. */ __le32 Count; /* Number of bytes to transfer. */ u8 Pad[58]; } __attribute__ ((packed)); struct freecom_ide_out { u8 Type; /* Type + IDE register. */ u8 Pad; __le16 Value; /* Value to write. */ u8 Pad2[60]; }; struct freecom_ide_in { u8 Type; /* Type | IDE register. */ u8 Pad[63]; }; struct freecom_status { u8 Status; u8 Reason; __le16 Count; u8 Pad[60]; }; /* Freecom stuffs the interrupt status in the INDEX_STAT bit of the ide * register. */ #define FCM_INT_STATUS 0x02 /* INDEX_STAT */ #define FCM_STATUS_BUSY 0x80 /* These are the packet types. The low bit indicates that this command * should wait for an interrupt. */ #define FCM_PACKET_ATAPI 0x21 #define FCM_PACKET_STATUS 0x20 /* Receive data from the IDE interface. The ATAPI packet has already * waited, so the data should be immediately available. */ #define FCM_PACKET_INPUT 0x81 /* Send data to the IDE interface. */ #define FCM_PACKET_OUTPUT 0x01 /* Write a value to an ide register. Or the ide register to write after * munging the address a bit. */ #define FCM_PACKET_IDE_WRITE 0x40 #define FCM_PACKET_IDE_READ 0xC0 /* All packets (except for status) are 64 bytes long. */ #define FCM_PACKET_LENGTH 64 #define FCM_STATUS_PACKET_LENGTH 4 static int freecom_readdata (struct scsi_cmnd *srb, struct us_data *us, unsigned int ipipe, unsigned int opipe, int count) { struct freecom_xfer_wrap *fxfr = (struct freecom_xfer_wrap *) us->iobuf; int result; fxfr->Type = FCM_PACKET_INPUT | 0x00; fxfr->Timeout = 0; /* Short timeout for debugging. */ fxfr->Count = cpu_to_le32 (count); memset (fxfr->Pad, 0, sizeof (fxfr->Pad)); US_DEBUGP("Read data Freecom! (c=%d)\n", count); /* Issue the transfer command. */ result = usb_stor_bulk_transfer_buf (us, opipe, fxfr, FCM_PACKET_LENGTH, NULL); if (result != USB_STOR_XFER_GOOD) { US_DEBUGP ("Freecom readdata transport error\n"); return USB_STOR_TRANSPORT_ERROR; } /* Now transfer all of our blocks. */ US_DEBUGP("Start of read\n"); result = usb_stor_bulk_transfer_sg(us, ipipe, srb->request_buffer, count, srb->use_sg, &srb->resid); US_DEBUGP("freecom_readdata done!\n"); if (result > USB_STOR_XFER_SHORT) return USB_STOR_TRANSPORT_ERROR; return USB_STOR_TRANSPORT_GOOD; } static int freecom_writedata (struct scsi_cmnd *srb, struct us_data *us, int unsigned ipipe, unsigned int opipe, int count) { struct freecom_xfer_wrap *fxfr = (struct freecom_xfer_wrap *) us->iobuf; int result; fxfr->Type = FCM_PACKET_OUTPUT | 0x00; fxfr->Timeout = 0; /* Short timeout for debugging. */ fxfr->Count = cpu_to_le32 (count); memset (fxfr->Pad, 0, sizeof (fxfr->Pad)); US_DEBUGP("Write data Freecom! (c=%d)\n", count); /* Issue the transfer command. */ result = usb_stor_bulk_transfer_buf (us, opipe, fxfr, FCM_PACKET_LENGTH, NULL); if (result != USB_STOR_XFER_GOOD) { US_DEBUGP ("Freecom writedata transport error\n"); return USB_STOR_TRANSPORT_ERROR; } /* Now transfer all of our blocks. */ US_DEBUGP("Start of write\n"); result = usb_stor_bulk_transfer_sg(us, opipe, srb->request_buffer, count, srb->use_sg, &srb->resid); US_DEBUGP("freecom_writedata done!\n"); if (result > USB_STOR_XFER_SHORT) return USB_STOR_TRANSPORT_ERROR; return USB_STOR_TRANSPORT_GOOD; } /* * Transport for the Freecom USB/IDE adaptor. * */ int freecom_transport(struct scsi_cmnd *srb, struct us_data *us) { struct freecom_cb_wrap *fcb; struct freecom_status *fst; unsigned int ipipe, opipe; /* We need both pipes. */ int result; unsigned int partial; int length; fcb = (struct freecom_cb_wrap *) us->iobuf; fst = (struct freecom_status *) us->iobuf; US_DEBUGP("Freecom TRANSPORT STARTED\n"); /* Get handles for both transports. */ opipe = us->send_bulk_pipe; ipipe = us->recv_bulk_pipe; /* The ATAPI Command always goes out first. */ fcb->Type = FCM_PACKET_ATAPI | 0x00; fcb->Timeout = 0; memcpy (fcb->Atapi, srb->cmnd, 12); memset (fcb->Filler, 0, sizeof (fcb->Filler)); US_DEBUG(pdump (srb->cmnd, 12)); /* Send it out. */ result = usb_stor_bulk_transfer_buf (us, opipe, fcb, FCM_PACKET_LENGTH, NULL); /* The Freecom device will only fail if there is something wrong in * USB land. It returns the status in its own registers, which * come back in the bulk pipe. */ if (result != USB_STOR_XFER_GOOD) { US_DEBUGP ("freecom transport error\n"); return USB_STOR_TRANSPORT_ERROR; } /* There are times we can optimize out this status read, but it * doesn't hurt us to always do it now. */ result = usb_stor_bulk_transfer_buf (us, ipipe, fst, FCM_STATUS_PACKET_LENGTH, &partial); US_DEBUGP("foo Status result %d %u\n", result, partial); if (result != USB_STOR_XFER_GOOD) return USB_STOR_TRANSPORT_ERROR; US_DEBUG(pdump ((void *) fst, partial)); /* The firmware will time-out commands after 20 seconds. Some commands * can legitimately take longer than this, so we use a different * command that only waits for the interrupt and then sends status, * without having to send a new ATAPI command to the device. * * NOTE: There is some indication that a data transfer after a timeout * may not work, but that is a condition that should never happen. */ while (fst->Status & FCM_STATUS_BUSY) { US_DEBUGP("20 second USB/ATAPI bridge TIMEOUT occurred!\n"); US_DEBUGP("fst->Status is %x\n", fst->Status); /* Get the status again */ fcb->Type = FCM_PACKET_STATUS; fcb->Timeout = 0; memset (fcb->Atapi, 0, sizeof(fcb->Atapi)); memset (fcb->Filler, 0, sizeof (fcb->Filler)); /* Send it out. */ result = usb_stor_bulk_transfer_buf (us, opipe, fcb, FCM_PACKET_LENGTH, NULL); /* The Freecom device will only fail if there is something * wrong in USB land. It returns the status in its own * registers, which come back in the bulk pipe. */ if (result != USB_STOR_XFER_GOOD) { US_DEBUGP ("freecom transport error\n"); return USB_STOR_TRANSPORT_ERROR; } /* get the data */ result = usb_stor_bulk_transfer_buf (us, ipipe, fst, FCM_STATUS_PACKET_LENGTH, &partial); US_DEBUGP("bar Status result %d %u\n", result, partial); if (result != USB_STOR_XFER_GOOD) return USB_STOR_TRANSPORT_ERROR; US_DEBUG(pdump ((void *) fst, partial)); } if (partial != 4) return USB_STOR_TRANSPORT_ERROR; if ((fst->Status & 1) != 0) { US_DEBUGP("operation failed\n"); return USB_STOR_TRANSPORT_FAILED; } /* The device might not have as much data available as we * requested. If you ask for more than the device has, this reads * and such will hang. */ US_DEBUGP("Device indicates that it has %d bytes available\n", le16_to_cpu (fst->Count)); US_DEBUGP("SCSI requested %d\n", srb->request_bufflen); /* Find the length we desire to read. */ switch (srb->cmnd[0]) { case INQUIRY: case REQUEST_SENSE: /* 16 or 18 bytes? spec says 18, lots of devices only have 16 */ case MODE_SENSE: case MODE_SENSE_10: length = le16_to_cpu(fst->Count); break; default: length = srb->request_bufflen; } /* verify that this amount is legal */ if (length > srb->request_bufflen) { length = srb->request_bufflen; US_DEBUGP("Truncating request to match buffer length: %d\n", length); } /* What we do now depends on what direction the data is supposed to * move in. */ switch (us->srb->sc_data_direction) { case DMA_FROM_DEVICE: /* catch bogus "read 0 length" case */ if (!length) break; /* Make sure that the status indicates that the device * wants data as well. */ if ((fst->Status & DRQ_STAT) == 0 || (fst->Reason & 3) != 2) { US_DEBUGP("SCSI wants data, drive doesn't have any\n"); return USB_STOR_TRANSPORT_FAILED; } result = freecom_readdata (srb, us, ipipe, opipe, length); if (result != USB_STOR_TRANSPORT_GOOD) return result; US_DEBUGP("FCM: Waiting for status\n"); result = usb_stor_bulk_transfer_buf (us, ipipe, fst, FCM_PACKET_LENGTH, &partial); US_DEBUG(pdump ((void *) fst, partial)); if (partial != 4 || result > USB_STOR_XFER_SHORT) return USB_STOR_TRANSPORT_ERROR; if ((fst->Status & ERR_STAT) != 0) { US_DEBUGP("operation failed\n"); return USB_STOR_TRANSPORT_FAILED; } if ((fst->Reason & 3) != 3) { US_DEBUGP("Drive seems still hungry\n"); return USB_STOR_TRANSPORT_FAILED; } US_DEBUGP("Transfer happy\n"); break; case DMA_TO_DEVICE: /* catch bogus "write 0 length" case */ if (!length) break; /* Make sure the status indicates that the device wants to * send us data. */ /* !!IMPLEMENT!! */ result = freecom_writedata (srb, us, ipipe, opipe, length); if (result != USB_STOR_TRANSPORT_GOOD) return result; US_DEBUGP("FCM: Waiting for status\n"); result = usb_stor_bulk_transfer_buf (us, ipipe, fst, FCM_PACKET_LENGTH, &partial); if (partial != 4 || result > USB_STOR_XFER_SHORT) return USB_STOR_TRANSPORT_ERROR; if ((fst->Status & ERR_STAT) != 0) { US_DEBUGP("operation failed\n"); return USB_STOR_TRANSPORT_FAILED; } if ((fst->Reason & 3) != 3) { US_DEBUGP("Drive seems still hungry\n"); return USB_STOR_TRANSPORT_FAILED; } US_DEBUGP("Transfer happy\n"); break; case DMA_NONE: /* Easy, do nothing. */ break; default: /* should never hit here -- filtered in usb.c */ US_DEBUGP ("freecom unimplemented direction: %d\n", us->srb->sc_data_direction); // Return fail, SCSI seems to handle this better. return USB_STOR_TRANSPORT_FAILED; break; } return USB_STOR_TRANSPORT_GOOD; } int freecom_init (struct us_data *us) { int result; char *buffer = us->iobuf; /* The DMA-mapped I/O buffer is 64 bytes long, just right for * all our packets. No need to allocate any extra buffer space. */ result = usb_stor_control_msg(us, us->recv_ctrl_pipe, 0x4c, 0xc0, 0x4346, 0x0, buffer, 0x20, 3*HZ); buffer[32] = '\0'; US_DEBUGP("String returned from FC init is: %s\n", buffer); /* Special thanks to the people at Freecom for providing me with * this "magic sequence", which they use in their Windows and MacOS * drivers to make sure that all the attached perhiperals are * properly reset. */ /* send reset */ result = usb_stor_control_msg(us, us->send_ctrl_pipe, 0x4d, 0x40, 0x24d8, 0x0, NULL, 0x0, 3*HZ); US_DEBUGP("result from activate reset is %d\n", result); /* wait 250ms */ mdelay(250); /* clear reset */ result = usb_stor_control_msg(us, us->send_ctrl_pipe, 0x4d, 0x40, 0x24f8, 0x0, NULL, 0x0, 3*HZ); US_DEBUGP("result from clear reset is %d\n", result); /* wait 3 seconds */ mdelay(3 * 1000); return USB_STOR_TRANSPORT_GOOD; } int usb_stor_freecom_reset(struct us_data *us) { printk (KERN_CRIT "freecom reset called\n"); /* We don't really have this feature. */ return FAILED; } #ifdef CONFIG_USB_STORAGE_DEBUG static void pdump (void *ibuffer, int length) { static char line[80]; int offset = 0; unsigned char *buffer = (unsigned char *) ibuffer; int i, j; int from, base; offset = 0; for (i = 0; i < length; i++) { if ((i & 15) == 0) { if (i > 0) { offset += sprintf (line+offset, " - "); for (j = i - 16; j < i; j++) { if (buffer[j] >= 32 && buffer[j] <= 126) line[offset++] = buffer[j]; else line[offset++] = '.'; } line[offset] = 0; US_DEBUGP("%s\n", line); offset = 0; } offset += sprintf (line+offset, "%08x:", i); } else if ((i & 7) == 0) { offset += sprintf (line+offset, " -"); } offset += sprintf (line+offset, " %02x", buffer[i] & 0xff); } /* Add the last "chunk" of data. */ from = (length - 1) % 16; base = ((length - 1) / 16) * 16; for (i = from + 1; i < 16; i++) offset += sprintf (line+offset, " "); if (from < 8) offset += sprintf (line+offset, " "); offset += sprintf (line+offset, " - "); for (i = 0; i <= from; i++) { if (buffer[base+i] >= 32 && buffer[base+i] <= 126) line[offset++] = buffer[base+i]; else line[offset++] = '.'; } line[offset] = 0; US_DEBUGP("%s\n", line); offset = 0; } #endif