/* * linux/drivers/block/ide-cd.c * * 1.00 Oct 31, 1994 -- Initial version. * 1.01 Nov 2, 1994 -- Fixed problem with starting request in * cdrom_check_status. * 1.03 Nov 25, 1994 -- leaving unmask_intr[] as a user-setting (as for disks) * (from mlord) -- minor changes to cdrom_setup() * -- renamed ide_dev_s to ide_dev_t, enable irq on command * 2.00 Nov 27, 1994 -- Generalize packet command interface; * add audio ioctls. * 2.01 Dec 3, 1994 -- Rework packet command interface to handle devices * which send an interrupt when ready for a command. * 2.02 Dec 11, 1994 -- Cache the TOC in the driver. * Don't use SCMD_PLAYAUDIO_TI; it's not included * in the current version of ATAPI. * Try to use LBA instead of track or MSF addressing * when possible. * Don't wait for READY_STAT. * 2.03 Jan 10, 1995 -- Rewrite block read routines to handle block sizes * other than 2k and to move multiple sectors in a * single transaction. * 2.04 Apr 21, 1995 -- Add work-around for Creative Labs CD220E drives. * Thanks to Nick Saw for * help in figuring this out. Ditto for Acer and * Aztech drives, which seem to have the same problem. * 2.04b May 30, 1995 -- Fix to match changes in ide.c version 3.16 -ml * * ATAPI cd-rom driver. To be used with ide.c. * * Copyright (C) 1994, 1995 scott snyder * May be copied or modified under the terms of the GNU General Public License * (../../COPYING). */ #include #define SECTOR_SIZE 512 #define SECTOR_BITS 9 #define SECTORS_PER_FRAME (CD_FRAMESIZE / SECTOR_SIZE) #define MIN(a,b) ((a) < (b) ? (a) : (b)) #if 1 /* "old" method */ #define OUT_WORDS(b,n) outsw (IDE_PORT (HD_DATA, dev->hwif), (b), (n)) #define IN_WORDS(b,n) insw (IDE_PORT (HD_DATA, dev->hwif), (b), (n)) #else /* "new" method -- should really fix each instance instead of this */ #define OUT_WORDS(b,n) output_ide_data(dev,b,(n)/2) #define IN_WORDS(b,n) input_ide_data(dev,b,(n)/2) #endif /* special command codes for strategy routine. */ #define PACKET_COMMAND 4315 #define WIN_PACKETCMD 0xa0 /* Send a packet command. */ /* Some ATAPI command opcodes (just like SCSI). (Some other cdrom-specific codes are in cdrom.h.) */ #define TEST_UNIT_READY 0x00 #define REQUEST_SENSE 0x03 #define START_STOP 0x1b #define ALLOW_MEDIUM_REMOVAL 0x1e #define READ_10 0x28 #define MODE_SENSE_10 0x5a #define MODE_SELECT_10 0x55 struct packet_command { char *buffer; int buflen; int stat; unsigned char c[12]; }; struct atapi_request_sense { unsigned char error_code : 7; unsigned char valid : 1; byte reserved1; unsigned char sense_key : 4; unsigned char reserved2 : 1; unsigned char ili : 1; unsigned char reserved3 : 2; byte info[4]; byte sense_len; byte command_info[4]; byte asc; byte ascq; byte fru; byte sense_key_specific[3]; }; /* We want some additional flags for cd-rom drives. To save space in the ide_dev_t struct, use one of the fields which doesn't make sense for cd-roms -- `bios_sect'. */ struct ide_cd_flags { unsigned drq_interrupt : 1; /* Device sends an interrupt when ready for a packet command. */ unsigned no_playaudio12: 1; /* The PLAYAUDIO12 command is not supported. */ unsigned media_changed : 1; /* Driver has noticed a media change. */ unsigned toc_valid : 1; /* Saved TOC information is current. */ unsigned no_lba_toc : 1; /* Drive cannot return TOC info in LBA format */ unsigned reserved : 3; }; #define CDROM_FLAGS(dev) ((struct ide_cd_flags *)&((dev)->bios_sect)) /* Space to hold the disk TOC. */ #define MAX_TRACKS 99 struct atapi_toc_header { unsigned short toc_length; byte first_track; byte last_track; }; struct atapi_toc_entry { byte reserved1; unsigned control : 4; unsigned adr : 4; byte track; byte reserved2; unsigned lba; }; struct atapi_toc { struct atapi_toc_header hdr; struct atapi_toc_entry ent[MAX_TRACKS+1]; /* One extra for the leadout. */ }; #define SECTOR_BUFFER_SIZE CD_FRAMESIZE /* Extra per-device info for cdrom drives. */ struct cdrom_info { /* Buffer for table of contents. NULL if we haven't allocated a TOC buffer for this device yet. */ struct atapi_toc *toc; /* Sector buffer. If a read request wants only the first part of a cdrom block, we cache the rest of the block here, in the expectation that that data is going to be wanted soon. SECTOR_BUFFERED is the number of the first buffered sector, and NSECTORS_BUFFERED is the number of sectors in the buffer. Before the buffer is allocated, we should have SECTOR_BUFFER == NULL and NSECTORS_BUFFERED == 0. */ unsigned long sector_buffered; unsigned long nsectors_buffered; char *sector_buffer; }; static struct cdrom_info cdrom_info[2][MAX_DRIVES]; /**************************************************************************** * Generic packet command support routines. */ static void cdrom_end_request (int uptodate, ide_dev_t *dev) { struct request *rq = ide_cur_rq[dev->hwif]; /* The code in blk.h can screw us up on error recovery if the block size is larger than 1k. Fix that up here. */ if (!uptodate && rq->bh != 0) { int adj = rq->current_nr_sectors - 1; rq->current_nr_sectors -= adj; rq->sector += adj; } end_request (uptodate, dev->hwif); } /* Mark that we've seen a media change, and invalidate our internal buffers. */ static void cdrom_saw_media_change (ide_dev_t *dev) { CDROM_FLAGS (dev)->media_changed = 1; CDROM_FLAGS (dev)->toc_valid = 0; cdrom_info[dev->hwif][dev->select.b.drive].nsectors_buffered = 0; } /* Returns 0 if the request should be continued. Returns 1 if the request was ended. */ static int cdrom_decode_status (ide_dev_t *dev, int good_stat, int *stat_ret) { struct request *rq = ide_cur_rq[dev->hwif]; int stat, err; /* Check for errors. */ stat = GET_STAT (dev->hwif); *stat_ret = stat; if (OK_STAT (stat, good_stat, BAD_R_STAT)) return 0; /* Got an error. */ err = IN_BYTE (HD_ERROR, dev->hwif); /* Check for tray open */ if ((err & 0xf0) == 0x20) { struct packet_command *pc; cdrom_saw_media_change (dev); /* Fail the request if this is a read command. */ if (rq->cmd == READ) { printk ("%s : tray open\n", dev->name); cdrom_end_request (0, dev); } else { /* Otherwise, it's some other packet command. Print an error message to the syslog. Exception: don't print anything if this is a read subchannel command. This is because workman constantly polls the drive with this command, and we don't want to uselessly fill up the syslog. */ pc = (struct packet_command *)rq->buffer; if (pc->c[0] != SCMD_READ_SUBCHANNEL) printk ("%s : tray open\n", dev->name); /* Set the error flag and complete the request. */ pc->stat = 1; cdrom_end_request (1, dev); } } /* Check for media change. */ else if ((err & 0xf0) == 0x60) { cdrom_saw_media_change (dev); printk ("%s: media changed\n", dev->name); /* We're going to retry this command. But be sure to give up if we've retried too many times. */ if ((++rq->errors > ERROR_MAX)) { cdrom_end_request (0, dev); } } /* Don't attempt to retry if this was a packet command. */ else if (rq->cmd == PACKET_COMMAND) { struct packet_command *pc = (struct packet_command *)rq->buffer; dump_status (dev->hwif, "packet command error", stat); pc->stat = 1; /* signal error */ cdrom_end_request (1, dev); } /* If there were other errors, go to the default handler. */ else if ((err & ~ABRT_ERR) != 0) { ide_error (dev, "cdrom_decode_status", stat); } /* Else, abort if we've racked up too many retries. */ else if ((++rq->errors > ERROR_MAX)) { cdrom_end_request (0, dev); } /* Retry, or handle the next request. */ DO_REQUEST; return 1; } /* Set up the device registers for transferring a packet command on DEV, expecting to later transfer XFERLEN bytes. This should be followed by a call to cdrom_transfer_packet_command; however, if this is a drq_interrupt device, one must wait for an interrupt first. */ static int cdrom_start_packet_command (ide_dev_t *dev, int xferlen) { /* Wait for the controller to be idle. */ if (wait_stat (dev, 0, BUSY_STAT, WAIT_READY)) return 1; /* Set up the controller registers. */ OUT_BYTE (0, HD_FEATURE); OUT_BYTE (0, HD_NSECTOR); OUT_BYTE (0, HD_SECTOR); OUT_BYTE (xferlen & 0xff, HD_LCYL); OUT_BYTE (xferlen >> 8 , HD_HCYL); OUT_BYTE (dev->ctl, HD_CMD); OUT_BYTE (WIN_PACKETCMD, HD_COMMAND); /* packet command */ return 0; } /* Send a packet command to DEV described by CMD_BUF and CMD_LEN. The device registers must have already been prepared by cdrom_start_packet_command. */ static int cdrom_transfer_packet_command (ide_dev_t *dev, char *cmd_buf, int cmd_len) { if (CDROM_FLAGS (dev)->drq_interrupt) { /* Here we should have been called after receiving an interrupt from the device. DRQ should how be set. */ int stat_dum; /* Check for errors. */ if (cdrom_decode_status (dev, DRQ_STAT, &stat_dum)) return 1; } else { /* Otherwise, we must wait for DRQ to get set. */ if (wait_stat (dev, DRQ_STAT, BAD_STAT, WAIT_READY)) return 1; } /* Send the command to the device. */ OUT_WORDS (cmd_buf, cmd_len/2); return 0; } /**************************************************************************** * Block read functions. */ /* * Buffer up to SECTORS_TO_TRANSFER sectors from the drive in our sector * buffer. SECTOR is the number of the first sector to be buffered. */ static void cdrom_buffer_sectors (ide_dev_t *dev, unsigned long sector, int sectors_to_transfer) { struct cdrom_info *info = &cdrom_info[dev->hwif][dev->select.b.drive]; /* Number of sectors to read into the buffer. */ int sectors_to_buffer = MIN (sectors_to_transfer, (SECTOR_BUFFER_SIZE >> SECTOR_BITS)); char *dest; /* If we don't yet have a sector buffer, try to allocate one. If we can't get one atomically, it's not fatal -- we'll just throw the data away rather than caching it. */ if (info->sector_buffer == NULL) { info->sector_buffer = (char *) kmalloc (SECTOR_BUFFER_SIZE, GFP_ATOMIC); /* If we couldn't get a buffer, don't try to buffer anything... */ if (info->sector_buffer == NULL) sectors_to_buffer = 0; } /* Remember the sector number and the number of sectors we're storing. */ info->sector_buffered = sector; info->nsectors_buffered = sectors_to_buffer; /* Read the data into the buffer. */ dest = info->sector_buffer; while (sectors_to_buffer > 0) { IN_WORDS (dest, SECTOR_SIZE / 2); --sectors_to_buffer; --sectors_to_transfer; dest += SECTOR_SIZE; } /* Throw away any remaining data. */ while (sectors_to_transfer > 0) { char dum[SECTOR_SIZE]; IN_WORDS (dest, sizeof (dum) / 2); --sectors_to_transfer; } } /* * Check the contents of the interrupt reason register from the cdrom * and attempt to recover if there are problems. Returns 0 if everything's * ok; nonzero if the request has been terminated. */ static inline int cdrom_read_check_ireason (ide_dev_t *dev, int len, int ireason) { ireason &= 3; if (ireason == 2) return 0; if (ireason == 0) { /* Whoops... The drive is expecting to receive data from us! */ printk ("%s: cdrom_read_intr: " "Drive wants to transfer data the wrong way!\n", dev->name); /* Throw some data at the drive so it doesn't hang and quit this request. */ while (len > 0) { short dum = 0; OUT_WORDS (&dum, 1); len -= 2; } } else { /* Drive wants a command packet, or invalid ireason... */ printk ("%s: cdrom_read_intr: bad interrupt reason %d\n", dev->name, ireason); } cdrom_end_request (0, dev); DO_REQUEST; return -1; } /* * Interrupt routine. Called when a read request has completed. */ static void cdrom_read_intr (ide_dev_t *dev) { int stat; int ireason, len, sectors_to_transfer, nskip; struct request *rq = ide_cur_rq[dev->hwif]; /* Check for errors. */ if (cdrom_decode_status (dev, 0, &stat)) return; /* Read the interrupt reason and the transfer length. */ ireason = IN_BYTE (HD_NSECTOR, dev->hwif); len = IN_BYTE (HD_LCYL, dev->hwif) + 256 * IN_BYTE (HD_HCYL, dev->hwif); /* If DRQ is clear, the command has completed. */ if ((stat & DRQ_STAT) == 0) { /* If we're not done filling the current buffer, complain. Otherwise, complete the command normally. */ if (rq->current_nr_sectors > 0) { printk ("%s: cdrom_read_intr: data underrun (%ld blocks)\n", dev->name, rq->current_nr_sectors); cdrom_end_request (0, dev); } else cdrom_end_request (1, dev); DO_REQUEST; return; } /* Check that the drive is expecting to do the same thing that we are. */ if (cdrom_read_check_ireason (dev, len, ireason)) return; /* Assume that the drive will always provide data in multiples of at least SECTOR_SIZE, as it gets hairy to keep track of the transfers otherwise. */ if ((len % SECTOR_SIZE) != 0) { printk ("%s: cdrom_read_intr: Bad transfer size %d\n", dev->name, len); printk (" This drive is not supported by this version of the driver\n"); cdrom_end_request (0, dev); DO_REQUEST; return; } /* The number of sectors we need to read from the drive. */ sectors_to_transfer = len / SECTOR_SIZE; /* First, figure out if we need to bit-bucket any of the leading sectors. */ nskip = MIN ((int)(rq->current_nr_sectors - (rq->bh->b_size >> SECTOR_BITS)), sectors_to_transfer); while (nskip > 0) { /* We need to throw away a sector. */ char dum[SECTOR_SIZE]; IN_WORDS (dum, sizeof (dum) / 2); --rq->current_nr_sectors; --nskip; --sectors_to_transfer; } /* Now loop while we still have data to read from the drive. */ while (sectors_to_transfer > 0) { int this_transfer; /* If we've filled the present buffer but there's another chained buffer after it, move on. */ if (rq->current_nr_sectors == 0 && rq->nr_sectors > 0) cdrom_end_request (1, dev); /* If the buffers are full, cache the rest of the data in our internal buffer. */ if (rq->current_nr_sectors == 0) { cdrom_buffer_sectors (dev, rq->sector, sectors_to_transfer); sectors_to_transfer = 0; } else { /* Transfer data to the buffers. Figure out how many sectors we can transfer to the current buffer. */ this_transfer = MIN (sectors_to_transfer, rq->current_nr_sectors); /* Read this_transfer sectors into the current buffer. */ while (this_transfer > 0) { IN_WORDS (rq->buffer, SECTOR_SIZE / 2); rq->buffer += SECTOR_SIZE; --rq->nr_sectors; --rq->current_nr_sectors; ++rq->sector; --this_transfer; --sectors_to_transfer; } } } /* Done moving data! Wait for another interrupt. */ ide_handler[dev->hwif] = cdrom_read_intr; } /* * Try to satisfy some of the current read request from our cached data. * Returns nonzero if the request has been completed, zero otherwise. */ static int cdrom_read_from_buffer (ide_dev_t *dev) { struct cdrom_info *info = &cdrom_info[dev->hwif][dev->select.b.drive]; struct request *rq = ide_cur_rq[dev->hwif]; /* Can't do anything if there's no buffer. */ if (info->sector_buffer == NULL) return 0; /* Loop while this request needs data and the next block is present in our cache. */ while (rq->nr_sectors > 0 && rq->sector >= info->sector_buffered && rq->sector < info->sector_buffered + info->nsectors_buffered) { if (rq->current_nr_sectors == 0) cdrom_end_request (1, dev); memcpy (rq->buffer, info->sector_buffer + (rq->sector - info->sector_buffered) * SECTOR_SIZE, SECTOR_SIZE); rq->buffer += SECTOR_SIZE; --rq->current_nr_sectors; --rq->nr_sectors; ++rq->sector; } /* If we've satisfied the current request, terminate it successfully. */ if (rq->nr_sectors == 0) { cdrom_end_request (1, dev); return -1; } /* Move on to the next buffer if needed. */ if (rq->current_nr_sectors == 0) cdrom_end_request (1, dev); /* If this condition does not hold, then the kluge i use to represent the number of sectors to skip at the start of a transfer will fail. I think that this will never happen, but let's be paranoid and check. */ if (rq->current_nr_sectors < (rq->bh->b_size >> SECTOR_BITS) && (rq->sector % SECTORS_PER_FRAME) != 0) { printk ("%s: cdrom_read_from_buffer: buffer botch (%ld)\n", dev->name, rq->sector); cdrom_end_request (0, dev); return -1; } return 0; } /* * Routine to send a read packet command to the drive. * This is usually called directly from cdrom_start_read. * However, for drq_interrupt devices, it is called from an interrupt * when the drive is ready to accept the command. */ static int cdrom_start_read_continuation (ide_dev_t *dev) { struct packet_command pc; struct request *rq = ide_cur_rq[dev->hwif]; int nsect, sector, nframes, frame, nskip; /* Number of sectors to transfer. */ nsect = rq->nr_sectors; /* Starting sector. */ sector = rq->sector; /* If the requested sector doesn't start on a cdrom block boundary, we must adjust the start of the transfer so that it does, and remember to skip the first few sectors. If the CURRENT_NR_SECTORS field is larger than the size of the buffer, it will mean that we're to skip a number of sectors equal to the amount by which CURRENT_NR_SECTORS is larger than the buffer size. */ nskip = (sector % SECTORS_PER_FRAME); if (nskip > 0) { /* Sanity check... */ if (rq->current_nr_sectors != (rq->bh->b_size >> SECTOR_BITS)) { printk ("%s: cdrom_start_read_continuation: buffer botch (%ld)\n", dev->name, rq->current_nr_sectors); cdrom_end_request (0, dev); DO_REQUEST; return 1; } sector -= nskip; nsect += nskip; rq->current_nr_sectors += nskip; } /* Convert from sectors to cdrom blocks, rounding up the transfer length if needed. */ nframes = (nsect + SECTORS_PER_FRAME-1) / SECTORS_PER_FRAME; frame = sector / SECTORS_PER_FRAME; /* Largest number of frames was can transfer at once is 64k-1. */ nframes = MIN (nframes, 65535); /* Set up the command */ memset (&pc.c, 0, sizeof (pc.c)); pc.c[0] = READ_10; pc.c[7] = (nframes >> 8); pc.c[8] = (nframes & 0xff); /* Write the sector address into the command image. */ { union { struct {unsigned char b0, b1, b2, b3;} b; struct {unsigned long l0;} l; } conv; conv.l.l0 = frame; pc.c[2] = conv.b.b3; pc.c[3] = conv.b.b2; pc.c[4] = conv.b.b1; pc.c[5] = conv.b.b0; } if (cdrom_transfer_packet_command (dev, pc.c, sizeof (pc.c))) return 1; /* Set up our interrupt handler and return. */ ide_handler[dev->hwif] = cdrom_read_intr; return 0; } /* * Start a read request from the CD-ROM. * Returns 0 if the request was started successfully, * 1 if there was an error and we should either retry or move on to the * next request. */ static int cdrom_start_read (ide_dev_t *dev, unsigned int block) { struct request *rq = ide_cur_rq[dev->hwif]; /* We may be retrying this request after an error. Fix up any weirdness which might be present in the request packet. */ if (rq->buffer != rq->bh->b_data) { int n = (rq->buffer - rq->bh->b_data) / SECTOR_SIZE; rq->buffer = rq->bh->b_data; rq->nr_sectors += n; rq->current_nr_sectors += n; rq->sector -= n; } if (rq->current_nr_sectors > (rq->bh->b_size >> SECTOR_BITS)) rq->current_nr_sectors = rq->bh->b_size; /* Satisfy whatever we can of this request from our cached sector. */ if (cdrom_read_from_buffer (dev)) return 1; if (cdrom_start_packet_command (dev, 32768)) return 1; if (CDROM_FLAGS (dev)->drq_interrupt) ide_handler[dev->hwif] = (void (*)(ide_dev_t *))cdrom_start_read_continuation; else { if (cdrom_start_read_continuation (dev)) return 1; } return 0; } /**************************************************************************** * Execute all other packet commands. */ static void cdrom_pc_intr (ide_dev_t *dev) { int ireason, len, stat, thislen; struct request *rq = ide_cur_rq[dev->hwif]; struct packet_command *pc = (struct packet_command *)rq->buffer; /* Check for errors. */ if (cdrom_decode_status (dev, 0, &stat)) return; /* Read the interrupt reason and the transfer length. */ ireason = IN_BYTE (HD_NSECTOR, dev->hwif); len = IN_BYTE (HD_LCYL, dev->hwif) + 256 * IN_BYTE (HD_HCYL, dev->hwif); /* If DRQ is clear, the command has completed. Complain if we still have data left to transfer. */ if ((stat & DRQ_STAT) == 0) { if (pc->buflen == 0) cdrom_end_request (1, dev); else { printk ("%s: cdrom_pc_intr: data underrun %d\n", dev->name, pc->buflen); pc->stat = 1; cdrom_end_request (1, dev); } DO_REQUEST; return; } /* Figure out how much data to transfer. */ thislen = pc->buflen; if (thislen < 0) thislen = -thislen; if (thislen > len) thislen = len; /* The drive wants to be written to. */ if ((ireason & 3) == 0) { /* Check that we want to write. */ if (pc->buflen > 0) { printk ("%s: cdrom_pc_intr: Drive wants to transfer data the wrong way!\n", dev->name); pc->stat = 1; thislen = 0; } /* Transfer the data. */ OUT_WORDS (pc->buffer, thislen / 2); /* If we haven't moved enough data to satisfy the drive, add some padding. */ while (len > thislen) { short dum = 0; OUT_WORDS (&dum, 1); len -= 2; } /* Keep count of how much data we've moved. */ pc->buffer += thislen; pc->buflen += thislen; } /* Same drill for reading. */ else if ((ireason & 3) == 2) { /* Check that we want to read. */ if (pc->buflen < 0) { printk ("%s: cdrom_pc_intr: Drive wants to transfer data the wrong way!\n", dev->name); pc->stat = 1; thislen = 0; } /* Transfer the data. */ IN_WORDS (pc->buffer, thislen / 2); /* If we haven't moved enough data to satisfy the drive, add some padding. */ while (len > thislen) { short dum = 0; IN_WORDS (&dum, 1); len -= 2; } /* Keep count of how much data we've moved. */ pc->buffer += thislen; pc->buflen -= thislen; } else { printk ("%s: cdrom_pc_intr: The drive appears confused (ireason = 0x%2x)\n", dev->name, ireason); pc->stat = 1; } /* Now we wait for another interrupt. */ ide_handler[dev->hwif] = cdrom_pc_intr; } static int cdrom_do_pc_continuation (ide_dev_t *dev) { struct request *rq = ide_cur_rq[dev->hwif]; struct packet_command *pc = (struct packet_command *)rq->buffer; if (cdrom_transfer_packet_command (dev, pc->c, sizeof (pc->c))) return 1; /* Set up our interrupt handler and return. */ ide_handler[dev->hwif] = cdrom_pc_intr; return 0; } static int cdrom_do_packet_command (ide_dev_t *dev) { int len; struct request *rq = ide_cur_rq[dev->hwif]; struct packet_command *pc = (struct packet_command *)rq->buffer; len = pc->buflen; if (len < 0) len = -len; pc->stat = 0; if (cdrom_start_packet_command (dev, len)) return 1; if (CDROM_FLAGS (dev)->drq_interrupt) ide_handler[dev->hwif] = (void (*)(ide_dev_t *))cdrom_do_pc_continuation; else { if (cdrom_do_pc_continuation (dev)) return 1; } return 0; } static int cdrom_queue_packet_command (ide_dev_t *dev, struct packet_command *pc) { unsigned long flags; struct request req, **p, **pfirst; struct semaphore sem = MUTEX_LOCKED; int major = ide_major[dev->hwif]; req.dev = MKDEV (major, (dev->select.b.drive) << PARTN_BITS); req.cmd = PACKET_COMMAND; req.errors = 0; req.sector = 0; req.nr_sectors = 0; req.current_nr_sectors = 0; req.buffer = (char *)pc; req.sem = &sem; req.bh = NULL; req.bhtail = NULL; req.next = NULL; save_flags (flags); cli (); p = &blk_dev[major].current_request; pfirst = p; while ((*p) != NULL) { p = &((*p)->next); } *p = &req; if (p == pfirst) blk_dev[major].request_fn (); restore_flags (flags); down (&sem); if (pc->stat != 0) return -EIO; else return 0; } /**************************************************************************** * cdrom driver request routine. */ static int do_rw_cdrom (ide_dev_t *dev, unsigned long block) { struct request *rq = ide_cur_rq[dev->hwif]; if (rq -> cmd == PACKET_COMMAND) return cdrom_do_packet_command (dev); if (rq -> cmd != READ) { printk ("ide-cd: bad cmd %d\n", rq -> cmd); cdrom_end_request (0, dev); return 1; } return cdrom_start_read (dev, block); } /**************************************************************************** * ioctl handling. */ static inline void byte_swap_word (unsigned short *x) { char *c = (char *)x; char d = c[0]; c[0] = c[1]; c[1] = d; } static inline void byte_swap_long (unsigned *x) { char *c = (char *)x; char d = c[0]; c[0] = c[3]; c[3] = d; d = c[1]; c[1] = c[2]; c[2] = d; } static int bin2bcd (int x) { return (x%10) | ((x/10) << 4); } static inline void lba_to_msf (int lba, byte *m, byte *s, byte *f) { lba += CD_BLOCK_OFFSET; lba &= 0xffffff; /* negative lbas use only 24 bits */ *m = lba / (CD_SECS * CD_FRAMES); lba %= (CD_SECS * CD_FRAMES); *s = lba / CD_FRAMES; *f = lba % CD_FRAMES; } static inline int msf_to_lba (byte m, byte s, byte f) { return (((m * CD_SECS) + s) * CD_FRAMES + f) - CD_BLOCK_OFFSET; } static void cdrom_check_status (ide_dev_t *dev) { struct packet_command pc; memset (&pc, 0, sizeof (pc)); pc.c[0] = TEST_UNIT_READY; (void) cdrom_queue_packet_command (dev, &pc); } static int cdrom_request_sense (ide_dev_t *dev, struct atapi_request_sense *reqbuf) { struct packet_command pc; memset (&pc, 0, sizeof (pc)); pc.c[0] = REQUEST_SENSE; pc.c[4] = sizeof (*reqbuf); pc.buffer = (char *)reqbuf; pc.buflen = sizeof (*reqbuf); return cdrom_queue_packet_command (dev, &pc); } #if 0 /* Lock the door if LOCKFLAG is nonzero; unlock it otherwise. */ static int cdrom_lockdoor (ide_dev_t *dev, int lockflag) { struct packet_command pc; memset (&pc, 0, sizeof (pc)); pc.c[0] = ALLOW_MEDIUM_REMOVAL; pc.c[4] = (lockflag != 0); return cdrom_queue_packet_command (dev, &pc); } #endif /* Eject the disk if EJECTFLAG is 0. If EJECTFLAG is 1, try to reload the disk. */ static int cdrom_eject (ide_dev_t *dev, int ejectflag) { struct packet_command pc; memset (&pc, 0, sizeof (pc)); pc.c[0] = START_STOP; pc.c[4] = 2 + (ejectflag != 0); return cdrom_queue_packet_command (dev, &pc); } static int cdrom_pause (ide_dev_t *dev, int pauseflag) { struct packet_command pc; memset (&pc, 0, sizeof (pc)); pc.c[0] = SCMD_PAUSE_RESUME; pc.c[8] = !pauseflag; return cdrom_queue_packet_command (dev, &pc); } static int cdrom_startstop (ide_dev_t *dev, int startflag) { struct packet_command pc; memset (&pc, 0, sizeof (pc)); pc.c[0] = START_STOP; pc.c[1] = 1; pc.c[4] = startflag; return cdrom_queue_packet_command (dev, &pc); } static int cdrom_read_tocentry (ide_dev_t *dev, int trackno, int msf_flag, char *buf, int buflen) { struct packet_command pc; memset (&pc, 0, sizeof (pc)); pc.buffer = buf; pc.buflen = buflen; pc.c[0] = SCMD_READ_TOC; pc.c[6] = trackno; pc.c[7] = (buflen >> 8); pc.c[8] = (buflen & 0xff); if (msf_flag) pc.c[1] = 2; return cdrom_queue_packet_command (dev, &pc); } /* Try to read the entire TOC for the disk into our internal buffer. */ static int cdrom_read_toc (ide_dev_t *dev) { int msf_flag; int stat, ntracks, i; struct atapi_toc *toc = cdrom_info[dev->hwif][dev->select.b.drive].toc; if (toc == NULL) { /* Try to allocate space. */ toc = (struct atapi_toc *) kmalloc (sizeof (struct atapi_toc), GFP_KERNEL); cdrom_info[dev->hwif][dev->select.b.drive].toc = toc; } if (toc == NULL) { printk ("%s: No cdrom TOC buffer!\n", dev->name); return -EIO; } /* Check to see if the existing data is still valid. If it is, just return. */ if (CDROM_FLAGS (dev)->toc_valid) cdrom_check_status (dev); if (CDROM_FLAGS (dev)->toc_valid) return 0; /* Some drives can't return TOC data in LBA format. */ msf_flag = (CDROM_FLAGS (dev)->no_lba_toc); /* First read just the header, so we know how long the TOC is. */ stat = cdrom_read_tocentry (dev, 0, msf_flag, (char *)toc, sizeof (struct atapi_toc_header) + sizeof (struct atapi_toc_entry)); if (stat) return stat; ntracks = toc->hdr.last_track - toc->hdr.first_track + 1; if (ntracks <= 0) return -EIO; if (ntracks > MAX_TRACKS) ntracks = MAX_TRACKS; /* Now read the whole schmeer. */ stat = cdrom_read_tocentry (dev, 0, msf_flag, (char *)toc, sizeof (struct atapi_toc_header) + (ntracks+1) * sizeof (struct atapi_toc_entry)); if (stat) return stat; byte_swap_word (&toc->hdr.toc_length); for (i=0; i<=ntracks; i++) { if (msf_flag) { byte *adr = (byte *)&(toc->ent[i].lba); toc->ent[i].lba = msf_to_lba (adr[1], adr[2], adr[3]); } else byte_swap_long (&toc->ent[i].lba); } /* Remember that we've read this stuff. */ CDROM_FLAGS (dev)->toc_valid = 1; return 0; } static int cdrom_read_subchannel (ide_dev_t *dev, char *buf, int buflen) { struct packet_command pc; memset (&pc, 0, sizeof (pc)); pc.buffer = buf; pc.buflen = buflen; pc.c[0] = SCMD_READ_SUBCHANNEL; pc.c[2] = 0x40; /* request subQ data */ pc.c[3] = 0x01; /* Format 1: current position */ pc.c[7] = (buflen >> 8); pc.c[8] = (buflen & 0xff); return cdrom_queue_packet_command (dev, &pc); } /* modeflag: 0 = current, 1 = changeable mask, 2 = default, 3 = saved */ static int cdrom_mode_sense (ide_dev_t *dev, int pageno, int modeflag, char *buf, int buflen) { struct packet_command pc; memset (&pc, 0, sizeof (pc)); pc.buffer = buf; pc.buflen = buflen; pc.c[0] = MODE_SENSE_10; pc.c[2] = pageno | (modeflag << 6); pc.c[7] = (buflen >> 8); pc.c[8] = (buflen & 0xff); return cdrom_queue_packet_command (dev, &pc); } static int cdrom_mode_select (ide_dev_t *dev, char *buf, int buflen) { struct packet_command pc; memset (&pc, 0, sizeof (pc)); pc.buffer = buf; pc.buflen = - buflen; pc.c[0] = MODE_SELECT_10; pc.c[1] = 0x10; pc.c[7] = (buflen >> 8); pc.c[8] = (buflen & 0xff); return cdrom_queue_packet_command (dev, &pc); } static int cdrom_play_lba_range_play12 (ide_dev_t *dev, int lba_start, int lba_end) { struct packet_command pc; memset (&pc, 0, sizeof (pc)); pc.c[0] = SCMD_PLAYAUDIO12; *(int *)(&pc.c[2]) = lba_start; *(int *)(&pc.c[6]) = lba_end - lba_start; byte_swap_long ((int *)(&pc.c[2])); byte_swap_long ((int *)(&pc.c[6])); return cdrom_queue_packet_command (dev, &pc); } static int cdrom_play_lba_range_msf (ide_dev_t *dev, int lba_start, int lba_end) { struct packet_command pc; memset (&pc, 0, sizeof (pc)); pc.c[0] = SCMD_PLAYAUDIO_MSF; lba_to_msf (lba_start, &pc.c[3], &pc.c[4], &pc.c[5]); lba_to_msf (lba_end-1, &pc.c[6], &pc.c[7], &pc.c[8]); pc.c[3] = bin2bcd (pc.c[3]); pc.c[4] = bin2bcd (pc.c[4]); pc.c[5] = bin2bcd (pc.c[5]); pc.c[6] = bin2bcd (pc.c[6]); pc.c[7] = bin2bcd (pc.c[7]); pc.c[8] = bin2bcd (pc.c[8]); return cdrom_queue_packet_command (dev, &pc); } /* Play audio starting at LBA LBA_START and finishing with the LBA before LBA_END. */ static int cdrom_play_lba_range (ide_dev_t *dev, int lba_start, int lba_end) { /* This is rather annoying. My NEC-260 won't recognize group 5 commands such as PLAYAUDIO12; the only way to get it to play more than 64k of blocks at once seems to be the PLAYAUDIO_MSF command. However, the parameters the NEC 260 wants for the PLAYMSF command are incompatible with the new version of the spec. So what i'll try is this. First try for PLAYAUDIO12. If it works, great. Otherwise, if the drive reports an illegal command code, try PLAYAUDIO_MSF using the NEC 260-style bcd parameters. */ if (CDROM_FLAGS (dev)->no_playaudio12) return cdrom_play_lba_range_msf (dev, lba_start, lba_end); else { int stat, stat2; struct atapi_request_sense reqbuf; stat = cdrom_play_lba_range_play12 (dev, lba_start, lba_end); if (stat == 0) return 0; /* It failed. Try to find out why. */ stat2 = cdrom_request_sense (dev, &reqbuf); if (stat2) return stat; if (reqbuf.sense_key == 0x05 && reqbuf.asc == 0x20) { /* The drive didn't recognize the command. Retry with the MSF variant. */ printk ("%s: Drive does not support PLAYAUDIO12; " "trying PLAYAUDIO_MSF\n", dev->name); CDROM_FLAGS (dev)->no_playaudio12 = 1; return cdrom_play_lba_range_msf (dev, lba_start, lba_end); } /* Failed for some other reason. Give up. */ return stat; } } static int cdrom_get_toc_entry (ide_dev_t *dev, int track, struct atapi_toc_entry **ent) { int stat, ntracks; struct atapi_toc *toc; /* Make sure our saved TOC is valid. */ stat = cdrom_read_toc (dev); if (stat) return stat; toc = cdrom_info[dev->hwif][dev->select.b.drive].toc; /* Check validity of requested track number. */ ntracks = toc->hdr.last_track - toc->hdr.first_track + 1; if (track == CDROM_LEADOUT) *ent = &toc->ent[ntracks]; else if (track < toc->hdr.first_track || track > toc->hdr.last_track) return -EINVAL; else *ent = &toc->ent[track - toc->hdr.first_track]; return 0; } static int ide_cdrom_ioctl (ide_dev_t *dev, struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) { switch (cmd) { case CDROMEJECT: return cdrom_eject (dev, 0); case CDROMPAUSE: return cdrom_pause (dev, 1); case CDROMRESUME: return cdrom_pause (dev, 0); case CDROMSTART: return cdrom_startstop (dev, 1); case CDROMSTOP: return cdrom_startstop (dev, 0); case CDROMPLAYMSF: { struct cdrom_msf msf; int stat, lba_start, lba_end; stat = verify_area (VERIFY_READ, (void *)arg, sizeof (msf)); if (stat) return stat; memcpy_fromfs (&msf, (void *) arg, sizeof(msf)); lba_start = msf_to_lba (msf.cdmsf_min0, msf.cdmsf_sec0, msf.cdmsf_frame0); lba_end = msf_to_lba (msf.cdmsf_min1, msf.cdmsf_sec1, msf.cdmsf_frame1) + 1; if (lba_end <= lba_start) return -EINVAL; return cdrom_play_lba_range (dev, lba_start, lba_end); } /* Like just about every other Linux cdrom driver, we ignore the index part of the request here. */ case CDROMPLAYTRKIND: { int stat, lba_start, lba_end; struct cdrom_ti ti; struct atapi_toc_entry *first_toc, *last_toc; stat = verify_area (VERIFY_READ, (void *)arg, sizeof (ti)); if (stat) return stat; memcpy_fromfs (&ti, (void *) arg, sizeof(ti)); stat = cdrom_get_toc_entry (dev, ti.cdti_trk0, &first_toc); if (stat) return stat; stat = cdrom_get_toc_entry (dev, ti.cdti_trk1, &last_toc); if (stat) return stat; if (ti.cdti_trk1 != CDROM_LEADOUT) ++last_toc; lba_start = first_toc->lba; lba_end = last_toc->lba; if (lba_end <= lba_start) return -EINVAL; return cdrom_play_lba_range (dev, lba_start, lba_end); } case CDROMREADTOCHDR: { int stat; struct cdrom_tochdr tochdr; struct atapi_toc *toc; stat = verify_area (VERIFY_WRITE, (void *) arg, sizeof (tochdr)); if (stat) return stat; /* Make sure our saved TOC is valid. */ stat = cdrom_read_toc (dev); if (stat) return stat; toc = cdrom_info[dev->hwif][dev->select.b.drive].toc; tochdr.cdth_trk0 = toc->hdr.first_track; tochdr.cdth_trk1 = toc->hdr.last_track; memcpy_tofs ((void *) arg, &tochdr, sizeof (tochdr)); return stat; } case CDROMREADTOCENTRY: { int stat; struct cdrom_tocentry tocentry; struct atapi_toc_entry *toce; stat = verify_area (VERIFY_READ, (void *) arg, sizeof (tocentry)); if (stat) return stat; stat = verify_area (VERIFY_WRITE, (void *) arg, sizeof (tocentry)); if (stat) return stat; memcpy_fromfs (&tocentry, (void *) arg, sizeof (tocentry)); stat = cdrom_get_toc_entry (dev, tocentry.cdte_track, &toce); if (stat) return stat; tocentry.cdte_ctrl = toce->control; tocentry.cdte_adr = toce->adr; if (tocentry.cdte_format == CDROM_MSF) { /* convert to MSF */ lba_to_msf (toce->lba, &tocentry.cdte_addr.msf.minute, &tocentry.cdte_addr.msf.second, &tocentry.cdte_addr.msf.frame); } else tocentry.cdte_addr.lba = toce->lba; memcpy_tofs ((void *) arg, &tocentry, sizeof (tocentry)); return stat; } case CDROMSUBCHNL: { char buffer[16]; int stat, abs_lba, rel_lba; struct cdrom_subchnl subchnl; stat = verify_area (VERIFY_WRITE, (void *) arg, sizeof (subchnl)); if (stat) return stat; stat = verify_area (VERIFY_READ, (void *) arg, sizeof (subchnl)); if (stat) return stat; memcpy_fromfs (&subchnl, (void *) arg, sizeof (subchnl)); stat = cdrom_read_subchannel (dev, buffer, sizeof (buffer)); if (stat) return stat; abs_lba = *(int *)&buffer[8]; rel_lba = *(int *)&buffer[12]; byte_swap_long (&abs_lba); byte_swap_long (&rel_lba); if (subchnl.cdsc_format == CDROM_MSF) { lba_to_msf (abs_lba, &subchnl.cdsc_absaddr.msf.minute, &subchnl.cdsc_absaddr.msf.second, &subchnl.cdsc_absaddr.msf.frame); lba_to_msf (rel_lba, &subchnl.cdsc_reladdr.msf.minute, &subchnl.cdsc_reladdr.msf.second, &subchnl.cdsc_reladdr.msf.frame); } else { subchnl.cdsc_absaddr.lba = abs_lba; subchnl.cdsc_reladdr.lba = rel_lba; } subchnl.cdsc_audiostatus = buffer[1]; subchnl.cdsc_ctrl = buffer[5] & 0xf; subchnl.cdsc_trk = buffer[6]; subchnl.cdsc_ind = buffer[7]; memcpy_tofs ((void *) arg, &subchnl, sizeof (subchnl)); return stat; } case CDROMVOLCTRL: { struct cdrom_volctrl volctrl; char buffer[24], mask[24]; int stat; stat = verify_area (VERIFY_READ, (void *) arg, sizeof (volctrl)); if (stat) return stat; memcpy_fromfs (&volctrl, (void *) arg, sizeof (volctrl)); stat = cdrom_mode_sense (dev, 0x0e, 0, buffer, sizeof (buffer)); if (stat) return stat; stat = cdrom_mode_sense (dev, 0x0e, 1, mask , sizeof (buffer)); if (stat) return stat; buffer[1] = buffer[2] = 0; buffer[17] = volctrl.channel0 & mask[17]; buffer[19] = volctrl.channel1 & mask[19]; buffer[21] = volctrl.channel2 & mask[21]; buffer[23] = volctrl.channel3 & mask[23]; return cdrom_mode_select (dev, buffer, sizeof (buffer)); } #ifdef TEST case 0x1234: { int stat; struct packet_command pc; memset (&pc, 0, sizeof (pc)); stat = verify_area (VERIFY_READ, (void *) arg, sizeof (pc.c)); if (stat) return stat; memcpy_fromfs (&pc.c, (void *) arg, sizeof (pc.c)); return cdrom_queue_packet_command (dev, &pc); } case 0x1235: { int stat; struct atapi_request_sense reqbuf; stat = verify_area (VERIFY_WRITE, (void *) arg, sizeof (reqbuf)); if (stat) return stat; stat = cdrom_request_sense (dev, &reqbuf); memcpy_tofs ((void *) arg, &reqbuf, sizeof (reqbuf)); return stat; } #endif default: return -EPERM; } } /**************************************************************************** * Other driver requests (open, close, check media change). */ static int cdrom_check_media_change (ide_dev_t *dev) { int retval; cdrom_check_status (dev); retval = CDROM_FLAGS (dev)->media_changed; CDROM_FLAGS (dev)->media_changed = 0; return retval; } static int cdrom_open (struct inode *ip, struct file *fp, ide_dev_t *dev) { /* no write access */ if (fp->f_mode & 2) return -EROFS; #if 0 /* With this, one cannot eject a disk with workman */ /* If this is the first open, lock the door. */ if (dev->usage == 1) (void) cdrom_lockdoor (dev, 1); #endif /* Should check that there's a disk in the drive? */ return 0; } /* * Close down the device. Invalidate all cached blocks. */ static void cdrom_release (struct inode *inode, struct file *file, ide_dev_t *dev) { if (dev->usage == 0) { invalidate_buffers (inode->i_rdev); #if 0 /* Unlock the door. */ (void) cdrom_lockdoor (dev, 0); #endif } } /**************************************************************************** * Device initialization. */ static void cdrom_setup (ide_dev_t *dev) { /* Just guess at capacity for now. */ ide_capacity[dev->hwif][dev->select.b.drive] = 0x1fffff; ide_blksizes[dev->hwif][dev->select.b.drive << PARTN_BITS] = CD_FRAMESIZE; dev->special.all = 0; CDROM_FLAGS (dev)->media_changed = 0; CDROM_FLAGS (dev)->toc_valid = 0; CDROM_FLAGS (dev)->no_playaudio12 = 0; CDROM_FLAGS (dev)->no_lba_toc = 0; CDROM_FLAGS (dev)->drq_interrupt = ((dev->id->config & 0x0060) == 0x20); /* Accommodate some broken drives... */ if (strcmp (dev->id->model, "CD220E") == 0) /* Creative Labs */ CDROM_FLAGS (dev)->no_lba_toc = 1; else if (strcmp (dev->id->model, "TO-ICSLYAL") == 0 || /* Acer CD525E */ strcmp (dev->id->model, "OTI-SCYLLA") == 0) CDROM_FLAGS (dev)->no_lba_toc = 1; else if (strcmp (dev->id->model, "CDA26803I SE") == 0) /* Aztech */ CDROM_FLAGS (dev)->no_lba_toc = 1; cdrom_info[dev->hwif][dev->select.b.drive].toc = NULL; cdrom_info[dev->hwif][dev->select.b.drive].sector_buffer = NULL; cdrom_info[dev->hwif][dev->select.b.drive].sector_buffered = 0; cdrom_info[dev->hwif][dev->select.b.drive].nsectors_buffered = 0; } #undef MIN #undef SECTOR_SIZE #undef SECTOR_BITS /* * TODO: * Retrieve and interpret extended ATAPI error codes. * Read actual disk capacity. * Multisession support. * Direct reading of audio data. * Eject-on-dismount. * Lock door while there's a mounted volume. */