pd.c
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- /*
- pd.c (c) 1997-8 Grant R. Guenther <grant@torque.net>
- Under the terms of the GNU General Public License.
- This is the high-level driver for parallel port IDE hard
- drives based on chips supported by the paride module.
- By default, the driver will autoprobe for a single parallel
- port IDE drive, but if their individual parameters are
- specified, the driver can handle up to 4 drives.
- The behaviour of the pd driver can be altered by setting
- some parameters from the insmod command line. The following
- parameters are adjustable:
-
- drive0 These four arguments can be arrays of
- drive1 1-8 integers as follows:
- drive2
- drive3 <prt>,<pro>,<uni>,<mod>,<geo>,<sby>,<dly>,<slv>
- Where,
- <prt> is the base of the parallel port address for
- the corresponding drive. (required)
- <pro> is the protocol number for the adapter that
- supports this drive. These numbers are
- logged by 'paride' when the protocol modules
- are initialised. (0 if not given)
- <uni> for those adapters that support chained
- devices, this is the unit selector for the
- chain of devices on the given port. It should
- be zero for devices that don't support chaining.
- (0 if not given)
- <mod> this can be -1 to choose the best mode, or one
- of the mode numbers supported by the adapter.
- (-1 if not given)
- <geo> this defaults to 0 to indicate that the driver
- should use the CHS geometry provided by the drive
- itself. If set to 1, the driver will provide
- a logical geometry with 64 heads and 32 sectors
- per track, to be consistent with most SCSI
- drivers. (0 if not given)
- <sby> set this to zero to disable the power saving
- standby mode, if needed. (1 if not given)
- <dly> some parallel ports require the driver to
- go more slowly. -1 sets a default value that
- should work with the chosen protocol. Otherwise,
- set this to a small integer, the larger it is
- the slower the port i/o. In some cases, setting
- this to zero will speed up the device. (default -1)
- <slv> IDE disks can be jumpered to master or slave.
- Set this to 0 to choose the master drive, 1 to
- choose the slave, -1 (the default) to choose the
- first drive found.
-
- major You may use this parameter to overide the
- default major number (45) that this driver
- will use. Be sure to change the device
- name as well.
- name This parameter is a character string that
- contains the name the kernel will use for this
- device (in /proc output, for instance).
- (default "pd")
- cluster The driver will attempt to aggregate requests
- for adjacent blocks into larger multi-block
- clusters. The maximum cluster size (in 512
- byte sectors) is set with this parameter.
- (default 64)
- verbose This parameter controls the amount of logging
- that the driver will do. Set it to 0 for
- normal operation, 1 to see autoprobe progress
- messages, or 2 to see additional debugging
- output. (default 0)
- nice This parameter controls the driver's use of
- idle CPU time, at the expense of some speed.
- If this driver is built into the kernel, you can use kernel
- the following command line parameters, with the same values
- as the corresponding module parameters listed above:
- pd.drive0
- pd.drive1
- pd.drive2
- pd.drive3
- pd.cluster
- pd.nice
- In addition, you can use the parameter pd.disable to disable
- the driver entirely.
-
- */
- /* Changes:
- 1.01 GRG 1997.01.24 Restored pd_reset()
- Added eject ioctl
- 1.02 GRG 1998.05.06 SMP spinlock changes,
- Added slave support
- 1.03 GRG 1998.06.16 Eliminate an Ugh.
- 1.04 GRG 1998.08.15 Extra debugging, use HZ in loop timing
- 1.05 GRG 1998.09.24 Added jumbo support
- */
- #define PD_VERSION "1.05"
- #define PD_MAJOR 45
- #define PD_NAME "pd"
- #define PD_UNITS 4
- /* Here are things one can override from the insmod command.
- Most are autoprobed by paride unless set here. Verbose is off
- by default.
- */
- static int verbose = 0;
- static int major = PD_MAJOR;
- static char *name = PD_NAME;
- static int cluster = 64;
- static int nice = 0;
- static int disable = 0;
- static int drive0[8] = {0,0,0,-1,0,1,-1,-1};
- static int drive1[8] = {0,0,0,-1,0,1,-1,-1};
- static int drive2[8] = {0,0,0,-1,0,1,-1,-1};
- static int drive3[8] = {0,0,0,-1,0,1,-1,-1};
- static int (*drives[4])[8] = {&drive0,&drive1,&drive2,&drive3};
- static int pd_drive_count;
- #define D_PRT 0
- #define D_PRO 1
- #define D_UNI 2
- #define D_MOD 3
- #define D_GEO 4
- #define D_SBY 5
- #define D_DLY 6
- #define D_SLV 7
- #define DU (*drives[unit])
- /* end of parameters */
- #include <linux/module.h>
- #include <linux/errno.h>
- #include <linux/fs.h>
- #include <linux/devfs_fs_kernel.h>
- #include <linux/kernel.h>
- #include <linux/delay.h>
- #include <linux/genhd.h>
- #include <linux/hdreg.h>
- #include <linux/cdrom.h> /* for the eject ioctl */
- #include <linux/spinlock.h>
- #include <asm/uaccess.h>
- #ifndef MODULE
- #include "setup.h"
- static STT pd_stt[7] = {{"drive0",8,drive0},
- {"drive1",8,drive1},
- {"drive2",8,drive2},
- {"drive3",8,drive3},
- {"disable",1,&disable},
- {"cluster",1,&cluster},
- {"nice",1,&nice}};
- void pd_setup( char *str, int *ints)
- { generic_setup(pd_stt,7,str);
- }
- #endif
- MODULE_PARM(verbose,"i");
- MODULE_PARM(major,"i");
- MODULE_PARM(name,"s");
- MODULE_PARM(cluster,"i");
- MODULE_PARM(nice,"i");
- MODULE_PARM(drive0,"1-8i");
- MODULE_PARM(drive1,"1-8i");
- MODULE_PARM(drive2,"1-8i");
- MODULE_PARM(drive3,"1-8i");
- #include "paride.h"
- #define PD_BITS 4
- /* set up defines for blk.h, why don't all drivers do it this way ? */
- #define MAJOR_NR major
- #define DEVICE_NAME "PD"
- #define DEVICE_REQUEST do_pd_request
- #define DEVICE_NR(device) (MINOR(device)>>PD_BITS)
- #define DEVICE_ON(device)
- #define DEVICE_OFF(device)
- #include <linux/blk.h>
- #include <linux/blkpg.h>
- #include "pseudo.h"
- #define PD_PARTNS (1<<PD_BITS)
- #define PD_DEVS PD_PARTNS*PD_UNITS
- /* numbers for "SCSI" geometry */
- #define PD_LOG_HEADS 64
- #define PD_LOG_SECTS 32
- #define PD_ID_OFF 54
- #define PD_ID_LEN 14
- #define PD_MAX_RETRIES 5
- #define PD_TMO 800 /* interrupt timeout in jiffies */
- #define PD_SPIN_DEL 50 /* spin delay in micro-seconds */
- #define PD_SPIN (1000000*PD_TMO)/(HZ*PD_SPIN_DEL)
- #define STAT_ERR 0x00001
- #define STAT_INDEX 0x00002
- #define STAT_ECC 0x00004
- #define STAT_DRQ 0x00008
- #define STAT_SEEK 0x00010
- #define STAT_WRERR 0x00020
- #define STAT_READY 0x00040
- #define STAT_BUSY 0x00080
- #define ERR_AMNF 0x00100
- #define ERR_TK0NF 0x00200
- #define ERR_ABRT 0x00400
- #define ERR_MCR 0x00800
- #define ERR_IDNF 0x01000
- #define ERR_MC 0x02000
- #define ERR_UNC 0x04000
- #define ERR_TMO 0x10000
- #define IDE_READ 0x20
- #define IDE_WRITE 0x30
- #define IDE_READ_VRFY 0x40
- #define IDE_INIT_DEV_PARMS 0x91
- #define IDE_STANDBY 0x96
- #define IDE_ACKCHANGE 0xdb
- #define IDE_DOORLOCK 0xde
- #define IDE_DOORUNLOCK 0xdf
- #define IDE_IDENTIFY 0xec
- #define IDE_EJECT 0xed
- int pd_init(void);
- void pd_setup(char * str, int * ints);
- #ifdef MODULE
- void cleanup_module( void );
- #endif
- static int pd_open(struct inode *inode, struct file *file);
- static void do_pd_request(request_queue_t * q);
- static int pd_ioctl(struct inode *inode,struct file *file,
- unsigned int cmd, unsigned long arg);
- static int pd_release (struct inode *inode, struct file *file);
- static int pd_revalidate(kdev_t dev);
- static int pd_detect(void);
- static void do_pd_read(void);
- static void do_pd_read_start(void);
- static void do_pd_write(void);
- static void do_pd_write_start(void);
- static void do_pd_read_drq( void );
- static void do_pd_write_done( void );
- static int pd_identify (int unit);
- static void pd_media_check(int unit);
- static void pd_doorlock(int unit, int func);
- static int pd_check_media(kdev_t dev);
- static void pd_eject( int unit);
- static struct hd_struct pd_hd[PD_DEVS];
- static int pd_sizes[PD_DEVS];
- static int pd_blocksizes[PD_DEVS];
- static int pd_maxsectors[PD_DEVS];
- #define PD_NAMELEN 8
- struct pd_unit {
- struct pi_adapter pia; /* interface to paride layer */
- struct pi_adapter *pi;
- int access; /* count of active opens ... */
- int capacity; /* Size of this volume in sectors */
- int heads; /* physical geometry */
- int sectors;
- int cylinders;
- int drive; /* master=0 slave=1 */
- int changed; /* Have we seen a disk change ? */
- int removable; /* removable media device ? */
- int standby;
- int alt_geom;
- int present;
- char name[PD_NAMELEN]; /* pda, pdb, etc ... */
- };
- struct pd_unit pd[PD_UNITS];
- /* 'unit' must be defined in all functions - either as a local or a param */
- #define PD pd[unit]
- #define PI PD.pi
- static int pd_valid = 1; /* serialise partition checks */
- static char pd_scratch[512]; /* scratch block buffer */
- /* the variables below are used mainly in the I/O request engine, which
- processes only one request at a time.
- */
- static int pd_retries = 0; /* i/o error retry count */
- static int pd_busy = 0; /* request being processed ? */
- static int pd_block; /* address of next requested block */
- static int pd_count; /* number of blocks still to do */
- static int pd_run; /* sectors in current cluster */
- static int pd_cmd; /* current command READ/WRITE */
- static int pd_unit; /* unit of current request */
- static int pd_dev; /* minor of current request */
- static int pd_poffs; /* partition offset of current minor */
- static char * pd_buf; /* buffer for request in progress */
- static DECLARE_WAIT_QUEUE_HEAD(pd_wait_open);
- static char *pd_errs[17] = { "ERR","INDEX","ECC","DRQ","SEEK","WRERR",
- "READY","BUSY","AMNF","TK0NF","ABRT","MCR",
- "IDNF","MC","UNC","???","TMO"};
- /* kernel glue structures */
- extern struct block_device_operations pd_fops;
- static struct gendisk pd_gendisk = {
- major: PD_MAJOR,
- major_name: PD_NAME,
- minor_shift: PD_BITS,
- max_p: PD_PARTNS,
- part: pd_hd,
- sizes: pd_sizes,
- fops: &pd_fops,
- };
- static struct block_device_operations pd_fops = {
- owner: THIS_MODULE,
- open: pd_open,
- release: pd_release,
- ioctl: pd_ioctl,
- check_media_change: pd_check_media,
- revalidate: pd_revalidate
- };
- void pd_init_units( void )
- { int unit, j;
- pd_drive_count = 0;
- for (unit=0;unit<PD_UNITS;unit++) {
- PD.pi = & PD.pia;
- PD.access = 0;
- PD.changed = 1;
- PD.capacity = 0;
- PD.drive = DU[D_SLV];
- PD.present = 0;
- j = 0;
- while ((j < PD_NAMELEN-2) && (PD.name[j]=name[j])) j++;
- PD.name[j++] = 'a' + unit;
- PD.name[j] = 0;
- PD.alt_geom = DU[D_GEO];
- PD.standby = DU[D_SBY];
- if (DU[D_PRT]) pd_drive_count++;
- }
- }
- int pd_init (void)
- { int i;
- request_queue_t * q;
- if (disable) return -1;
- if (devfs_register_blkdev(MAJOR_NR,name,&pd_fops)) {
- printk("%s: unable to get major number %dn",
- name,major);
- return -1;
- }
- q = BLK_DEFAULT_QUEUE(MAJOR_NR);
- blk_init_queue(q, DEVICE_REQUEST);
- read_ahead[MAJOR_NR] = 8; /* 8 sector (4kB) read ahead */
-
- pd_gendisk.major = major;
- pd_gendisk.major_name = name;
- add_gendisk(&pd_gendisk);
- for(i=0;i<PD_DEVS;i++) pd_blocksizes[i] = 1024;
- blksize_size[MAJOR_NR] = pd_blocksizes;
- for(i=0;i<PD_DEVS;i++) pd_maxsectors[i] = cluster;
- max_sectors[MAJOR_NR] = pd_maxsectors;
- printk("%s: %s version %s, major %d, cluster %d, nice %dn",
- name,name,PD_VERSION,major,cluster,nice);
- pd_init_units();
- pd_valid = 0;
- pd_gendisk.nr_real = pd_detect();
- pd_valid = 1;
- #ifdef MODULE
- if (!pd_gendisk.nr_real) {
- cleanup_module();
- return -1;
- }
- #endif
- return 0;
- }
- static int pd_open (struct inode *inode, struct file *file)
- { int unit = DEVICE_NR(inode->i_rdev);
- if ((unit >= PD_UNITS) || (!PD.present)) return -ENODEV;
- wait_event (pd_wait_open, pd_valid);
- PD.access++;
- if (PD.removable) {
- pd_media_check(unit);
- pd_doorlock(unit,IDE_DOORLOCK);
- }
- return 0;
- }
- static int pd_ioctl(struct inode *inode,struct file *file,
- unsigned int cmd, unsigned long arg)
- { struct hd_geometry *geo = (struct hd_geometry *) arg;
- int dev, err, unit;
- if ((!inode) || (!inode->i_rdev)) return -EINVAL;
- dev = MINOR(inode->i_rdev);
- unit = DEVICE_NR(inode->i_rdev);
- if (dev >= PD_DEVS) return -EINVAL;
- if (!PD.present) return -ENODEV;
- switch (cmd) {
- case CDROMEJECT:
- if (PD.access == 1) pd_eject(unit);
- return 0;
- case HDIO_GETGEO:
- if (!geo) return -EINVAL;
- err = verify_area(VERIFY_WRITE,geo,sizeof(*geo));
- if (err) return err;
- if (PD.alt_geom) {
- put_user(PD.capacity/(PD_LOG_HEADS*PD_LOG_SECTS),
- (short *) &geo->cylinders);
- put_user(PD_LOG_HEADS, (char *) &geo->heads);
- put_user(PD_LOG_SECTS, (char *) &geo->sectors);
- } else {
- put_user(PD.cylinders, (short *) &geo->cylinders);
- put_user(PD.heads, (char *) &geo->heads);
- put_user(PD.sectors, (char *) &geo->sectors);
- }
- put_user(pd_hd[dev].start_sect,(long *)&geo->start);
- return 0;
- case BLKRRPART:
- if (!capable(CAP_SYS_ADMIN))
- return -EACCES;
- return pd_revalidate(inode->i_rdev);
- case BLKGETSIZE:
- case BLKGETSIZE64:
- case BLKROSET:
- case BLKROGET:
- case BLKRASET:
- case BLKRAGET:
- case BLKFLSBUF:
- case BLKPG:
- return blk_ioctl(inode->i_rdev, cmd, arg);
- default:
- return -EINVAL;
- }
- }
- static int pd_release (struct inode *inode, struct file *file)
- { kdev_t devp;
- int unit;
- devp = inode->i_rdev;
- unit = DEVICE_NR(devp);
- if ((unit >= PD_UNITS) || (PD.access <= 0))
- return -EINVAL;
- PD.access--;
- if (!PD.access && PD.removable)
- pd_doorlock(unit,IDE_DOORUNLOCK);
- return 0;
- }
- static int pd_check_media( kdev_t dev)
- { int r, unit;
- unit = DEVICE_NR(dev);
- if ((unit >= PD_UNITS) || (!PD.present)) return -ENODEV;
- if (!PD.removable) return 0;
- pd_media_check(unit);
- r = PD.changed;
- PD.changed = 0;
- return r;
- }
- static int pd_revalidate(kdev_t dev)
- { int p, unit, minor;
- long flags;
- unit = DEVICE_NR(dev);
- if ((unit >= PD_UNITS) || (!PD.present)) return -ENODEV;
- save_flags(flags);
- cli();
- if (PD.access > 1) {
- restore_flags(flags);
- return -EBUSY;
- }
- pd_valid = 0;
- restore_flags(flags);
- for (p=(PD_PARTNS-1);p>=0;p--) {
- minor = p + unit*PD_PARTNS;
- invalidate_device(MKDEV(MAJOR_NR, minor), 1);
- pd_hd[minor].start_sect = 0;
- pd_hd[minor].nr_sects = 0;
- }
- if (pd_identify(unit))
- grok_partitions(&pd_gendisk,unit,1<<PD_BITS,PD.capacity);
- pd_valid = 1;
- wake_up(&pd_wait_open);
- return 0;
- }
- #ifdef MODULE
- /* Glue for modules ... */
- void cleanup_module(void);
- int init_module(void)
- {
- #ifdef PARIDE_JUMBO
- { extern paride_init();
- paride_init();
- }
- #endif
- return pd_init();
- }
- void cleanup_module(void)
- {
- int unit;
- devfs_unregister_blkdev(MAJOR_NR,name);
- del_gendisk(&pd_gendisk);
- for (unit=0;unit<PD_UNITS;unit++)
- if (PD.present) pi_release(PI);
- max_sectors[MAJOR_NR] = NULL;
- }
- #endif
- #define WR(c,r,v) pi_write_regr(PI,c,r,v)
- #define RR(c,r) (pi_read_regr(PI,c,r))
- #define DRIVE (0xa0+0x10*PD.drive)
- /* ide command interface */
- static void pd_print_error( int unit, char * msg, int status )
- { int i;
- printk("%s: %s: status = 0x%x =",PD.name,msg,status);
- for(i=0;i<18;i++) if (status & (1<<i)) printk(" %s",pd_errs[i]);
- printk("n");
- }
- static void pd_reset( int unit ) /* called only for MASTER drive */
- { pi_connect(PI);
- WR(1,6,4);
- udelay(50);
- WR(1,6,0);
- pi_disconnect(PI);
- udelay(250);
- }
- #define DBMSG(msg) ((verbose>1)?(msg):NULL)
- static int pd_wait_for( int unit, int w, char * msg ) /* polled wait */
- { int k, r, e;
- k=0;
- while(k < PD_SPIN) {
- r = RR(1,6);
- k++;
- if (((r & w) == w) && !(r & STAT_BUSY)) break;
- udelay(PD_SPIN_DEL);
- }
- e = (RR(0,1)<<8) + RR(0,7);
- if (k >= PD_SPIN) e |= ERR_TMO;
- if ((e & (STAT_ERR|ERR_TMO)) && (msg != NULL))
- pd_print_error(unit,msg,e);
- return e;
- }
- static void pd_send_command( int unit, int n, int s, int h,
- int c0, int c1, int func )
- {
- WR(0,6,DRIVE+h);
- WR(0,1,0); /* the IDE task file */
- WR(0,2,n);
- WR(0,3,s);
- WR(0,4,c0);
- WR(0,5,c1);
- WR(0,7,func);
- udelay(1);
- }
- static void pd_ide_command( int unit, int func, int block, int count )
- /* Don't use this call if the capacity is zero. */
- { int c1, c0, h, s;
- s = ( block % PD.sectors) + 1;
- h = ( block / PD.sectors) % PD.heads;
- c0 = ( block / (PD.sectors*PD.heads)) % 256;
- c1 = ( block / (PD.sectors*PD.heads*256));
- pd_send_command(unit,count,s,h,c0,c1,func);
- }
- /* According to the ATA standard, the default CHS geometry should be
- available following a reset. Some Western Digital drives come up
- in a mode where only LBA addresses are accepted until the device
- parameters are initialised.
- */
- static void pd_init_dev_parms( int unit )
-
- { pi_connect(PI);
- pd_wait_for(unit,0,DBMSG("before init_dev_parms"));
- pd_send_command(unit,PD.sectors,0,PD.heads-1,0,0,IDE_INIT_DEV_PARMS);
- udelay(300);
- pd_wait_for(unit,0,"Initialise device parameters");
- pi_disconnect(PI);
- }
- static void pd_doorlock( int unit, int func )
- { pi_connect(PI);
- if (pd_wait_for(unit,STAT_READY,"Lock") & STAT_ERR) {
- pi_disconnect(PI);
- return;
- }
- pd_send_command(unit,1,0,0,0,0,func);
- pd_wait_for(unit,STAT_READY,"Lock done");
- pi_disconnect(PI);
- }
- static void pd_eject( int unit )
- { pi_connect(PI);
- pd_wait_for(unit,0,DBMSG("before unlock on eject"));
- pd_send_command(unit,1,0,0,0,0,IDE_DOORUNLOCK);
- pd_wait_for(unit,0,DBMSG("after unlock on eject"));
- pd_wait_for(unit,0,DBMSG("before eject"));
- pd_send_command(unit,0,0,0,0,0,IDE_EJECT);
- pd_wait_for(unit,0,DBMSG("after eject"));
- pi_disconnect(PI);
- }
- static void pd_media_check( int unit )
- { int r;
- pi_connect(PI);
- r = pd_wait_for(unit,STAT_READY,DBMSG("before media_check"));
- if (!(r & STAT_ERR)) {
- pd_send_command(unit,1,1,0,0,0,IDE_READ_VRFY);
- r = pd_wait_for(unit,STAT_READY,DBMSG("RDY after READ_VRFY"));
- } else PD.changed = 1; /* say changed if other error */
- if (r & ERR_MC) {
- PD.changed = 1;
- pd_send_command(unit,1,0,0,0,0,IDE_ACKCHANGE);
- pd_wait_for(unit,STAT_READY,DBMSG("RDY after ACKCHANGE"));
- pd_send_command(unit,1,1,0,0,0,IDE_READ_VRFY);
- r = pd_wait_for(unit,STAT_READY,DBMSG("RDY after VRFY"));
- }
- pi_disconnect(PI);
- }
- static void pd_standby_off( int unit )
- { pi_connect(PI);
- pd_wait_for(unit,0,DBMSG("before STANDBY"));
- pd_send_command(unit,0,0,0,0,0,IDE_STANDBY);
- pd_wait_for(unit,0,DBMSG("after STANDBY"));
- pi_disconnect(PI);
- }
- #define word_val(n) ((pd_scratch[2*n]&0xff)+256*(pd_scratch[2*n+1]&0xff))
- static int pd_identify( int unit )
- { int j;
- char id[PD_ID_LEN+1];
- /* WARNING: here there may be dragons. reset() applies to both drives,
- but we call it only on probing the MASTER. This should allow most
- common configurations to work, but be warned that a reset can clear
- settings on the SLAVE drive.
- */
- if (PD.drive == 0) pd_reset(unit);
- pi_connect(PI);
- WR(0,6,DRIVE);
- pd_wait_for(unit,0,DBMSG("before IDENT"));
- pd_send_command(unit,1,0,0,0,0,IDE_IDENTIFY);
- if (pd_wait_for(unit,STAT_DRQ,DBMSG("IDENT DRQ")) & STAT_ERR) {
- pi_disconnect(PI);
- return 0;
- }
- pi_read_block(PI,pd_scratch,512);
- pi_disconnect(PI);
- PD.sectors = word_val(6);
- PD.heads = word_val(3);
- PD.cylinders = word_val(1);
- PD.capacity = PD.sectors*PD.heads*PD.cylinders;
- for(j=0;j<PD_ID_LEN;j++) id[j^1] = pd_scratch[j+PD_ID_OFF];
- j = PD_ID_LEN-1;
- while ((j >= 0) && (id[j] <= 0x20)) j--;
- j++; id[j] = 0;
- PD.removable = (word_val(0) & 0x80);
-
- printk("%s: %s, %s, %d blocks [%dM], (%d/%d/%d), %s median",
- PD.name,id,
- PD.drive?"slave":"master",
- PD.capacity,PD.capacity/2048,
- PD.cylinders,PD.heads,PD.sectors,
- PD.removable?"removable":"fixed");
- if (PD.capacity) pd_init_dev_parms(unit);
- if (!PD.standby) pd_standby_off(unit);
-
- return 1;
- }
- static int pd_probe_drive( int unit )
- {
- if (PD.drive == -1) {
- for (PD.drive=0;PD.drive<=1;PD.drive++)
- if (pd_identify(unit))
- return 1;
- return 0;
- }
- return pd_identify(unit);
- }
- static int pd_detect( void )
- { int k, unit;
- k = 0;
- if (pd_drive_count == 0) { /* nothing spec'd - so autoprobe for 1 */
- unit = 0;
- if (pi_init(PI,1,-1,-1,-1,-1,-1,pd_scratch,
- PI_PD,verbose,PD.name)) {
- if (pd_probe_drive(unit)) {
- PD.present = 1;
- k = 1;
- } else pi_release(PI);
- }
- } else for (unit=0;unit<PD_UNITS;unit++) if (DU[D_PRT])
- if (pi_init(PI,0,DU[D_PRT],DU[D_MOD],DU[D_UNI],
- DU[D_PRO],DU[D_DLY],pd_scratch,
- PI_PD,verbose,PD.name)) {
- if (pd_probe_drive(unit)) {
- PD.present = 1;
- k = unit+1;
- } else pi_release(PI);
- }
- for (unit=0;unit<PD_UNITS;unit++)
- register_disk(&pd_gendisk,MKDEV(MAJOR_NR,unit<<PD_BITS),
- PD_PARTNS,&pd_fops,
- PD.present?PD.capacity:0);
- /* We lie about the number of drives found, as the generic partition
- scanner assumes that the drives are numbered sequentially from 0.
- This can result in some bogus error messages if non-sequential
- drive numbers are used.
- */
- if (k)
- return k;
- printk("%s: no valid drive foundn",name);
- return 0;
- }
- /* The i/o request engine */
- static int pd_ready( void )
- { int unit = pd_unit;
- return (!(RR(1,6) & STAT_BUSY)) ;
- }
- static void do_pd_request (request_queue_t * q)
- { struct buffer_head * bh;
- int unit;
- if (pd_busy) return;
- repeat:
- if (QUEUE_EMPTY || (CURRENT->rq_status == RQ_INACTIVE)) return;
- INIT_REQUEST;
- pd_dev = MINOR(CURRENT->rq_dev);
- pd_unit = unit = DEVICE_NR(CURRENT->rq_dev);
- pd_block = CURRENT->sector;
- pd_run = CURRENT->nr_sectors;
- pd_count = CURRENT->current_nr_sectors;
- bh = CURRENT->bh;
- if ((pd_dev >= PD_DEVS) ||
- ((pd_block+pd_count) > pd_hd[pd_dev].nr_sects)) {
- end_request(0);
- goto repeat;
- }
- pd_cmd = CURRENT->cmd;
- pd_poffs = pd_hd[pd_dev].start_sect;
- pd_block += pd_poffs;
- pd_buf = CURRENT->buffer;
- pd_retries = 0;
- pd_busy = 1;
- if (pd_cmd == READ) pi_do_claimed(PI,do_pd_read);
- else if (pd_cmd == WRITE) pi_do_claimed(PI,do_pd_write);
- else { pd_busy = 0;
- end_request(0);
- goto repeat;
- }
- }
- static void pd_next_buf( int unit )
- { long saved_flags;
- spin_lock_irqsave(&io_request_lock,saved_flags);
- end_request(1);
- if (!pd_run) { spin_unlock_irqrestore(&io_request_lock,saved_flags);
- return;
- }
-
- /* paranoia */
- if (QUEUE_EMPTY ||
- (CURRENT->cmd != pd_cmd) ||
- (MINOR(CURRENT->rq_dev) != pd_dev) ||
- (CURRENT->rq_status == RQ_INACTIVE) ||
- (CURRENT->sector+pd_poffs != pd_block))
- printk("%s: OUCH: request list changed unexpectedlyn",
- PD.name);
- pd_count = CURRENT->current_nr_sectors;
- pd_buf = CURRENT->buffer;
- spin_unlock_irqrestore(&io_request_lock,saved_flags);
- }
- static void do_pd_read( void )
- { ps_set_intr(do_pd_read_start,0,0,nice);
- }
- static void do_pd_read_start( void )
-
- { int unit = pd_unit;
- long saved_flags;
- pd_busy = 1;
- pi_connect(PI);
- if (pd_wait_for(unit,STAT_READY,"do_pd_read") & STAT_ERR) {
- pi_disconnect(PI);
- if (pd_retries < PD_MAX_RETRIES) {
- pd_retries++;
- pi_do_claimed(PI,do_pd_read_start);
- return;
- }
- spin_lock_irqsave(&io_request_lock,saved_flags);
- end_request(0);
- pd_busy = 0;
- do_pd_request(NULL);
- spin_unlock_irqrestore(&io_request_lock,saved_flags);
- return;
- }
- pd_ide_command(unit,IDE_READ,pd_block,pd_run);
- ps_set_intr(do_pd_read_drq,pd_ready,PD_TMO,nice);
- }
- static void do_pd_read_drq( void )
- { int unit = pd_unit;
- long saved_flags;
- while (1) {
- if (pd_wait_for(unit,STAT_DRQ,"do_pd_read_drq") & STAT_ERR) {
- pi_disconnect(PI);
- if (pd_retries < PD_MAX_RETRIES) {
- pd_retries++;
- pi_do_claimed(PI,do_pd_read_start);
- return;
- }
- spin_lock_irqsave(&io_request_lock,saved_flags);
- end_request(0);
- pd_busy = 0;
- do_pd_request(NULL);
- spin_unlock_irqrestore(&io_request_lock,saved_flags);
- return;
- }
- pi_read_block(PI,pd_buf,512);
- pd_count--; pd_run--;
- pd_buf += 512;
- pd_block++;
- if (!pd_run) break;
- if (!pd_count) pd_next_buf(unit);
- }
- pi_disconnect(PI);
- spin_lock_irqsave(&io_request_lock,saved_flags);
- end_request(1);
- pd_busy = 0;
- do_pd_request(NULL);
- spin_unlock_irqrestore(&io_request_lock,saved_flags);
- }
- static void do_pd_write( void )
- { ps_set_intr(do_pd_write_start,0,0,nice);
- }
- static void do_pd_write_start( void )
- { int unit = pd_unit;
- long saved_flags;
- pd_busy = 1;
- pi_connect(PI);
- if (pd_wait_for(unit,STAT_READY,"do_pd_write") & STAT_ERR) {
- pi_disconnect(PI);
- if (pd_retries < PD_MAX_RETRIES) {
- pd_retries++;
- pi_do_claimed(PI,do_pd_write_start);
- return;
- }
- spin_lock_irqsave(&io_request_lock,saved_flags);
- end_request(0);
- pd_busy = 0;
- do_pd_request(NULL);
- spin_unlock_irqrestore(&io_request_lock,saved_flags);
- return;
- }
- pd_ide_command(unit,IDE_WRITE,pd_block,pd_run);
- while (1) {
- if (pd_wait_for(unit,STAT_DRQ,"do_pd_write_drq") & STAT_ERR) {
- pi_disconnect(PI);
- if (pd_retries < PD_MAX_RETRIES) {
- pd_retries++;
- pi_do_claimed(PI,do_pd_write_start);
- return;
- }
- spin_lock_irqsave(&io_request_lock,saved_flags);
- end_request(0);
- pd_busy = 0;
- do_pd_request(NULL);
- spin_unlock_irqrestore(&io_request_lock,saved_flags);
- return;
- }
- pi_write_block(PI,pd_buf,512);
- pd_count--; pd_run--;
- pd_buf += 512;
- pd_block++;
- if (!pd_run) break;
- if (!pd_count) pd_next_buf(unit);
- }
- ps_set_intr(do_pd_write_done,pd_ready,PD_TMO,nice);
- }
- static void do_pd_write_done( void )
- { int unit = pd_unit;
- long saved_flags;
- if (pd_wait_for(unit,STAT_READY,"do_pd_write_done") & STAT_ERR) {
- pi_disconnect(PI);
- if (pd_retries < PD_MAX_RETRIES) {
- pd_retries++;
- pi_do_claimed(PI,do_pd_write_start);
- return;
- }
- spin_lock_irqsave(&io_request_lock,saved_flags);
- end_request(0);
- pd_busy = 0;
- do_pd_request(NULL);
- spin_unlock_irqrestore(&io_request_lock,saved_flags);
- return;
- }
- pi_disconnect(PI);
- spin_lock_irqsave(&io_request_lock,saved_flags);
- end_request(1);
- pd_busy = 0;
- do_pd_request(NULL);
- spin_unlock_irqrestore(&io_request_lock,saved_flags);
- }
- /* end of pd.c */
- MODULE_LICENSE("GPL");