pf.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:29k
- /*
- pf.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 ATAPI disk
- drives based on chips supported by the paride module.
- By default, the driver will autoprobe for a single parallel
- port ATAPI disk drive, but if their individual parameters are
- specified, the driver can handle up to 4 drives.
- The behaviour of the pf 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 1-7 integers as follows:
- drive2
- drive3 <prt>,<pro>,<uni>,<mod>,<slv>,<lun>,<dly>
- 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)
- <slv> ATAPI CDroms 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.
- <lun> Some ATAPI devices support multiple LUNs.
- One example is the ATAPI PD/CD drive from
- Matshita/Panasonic. This device has a
- CD drive on LUN 0 and a PD drive on LUN 1.
- By default, the driver will search for the
- first LUN with a supported device. Set
- this parameter to force it to use a specific
- LUN. (default -1)
- <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)
- major You may use this parameter to overide the
- default major number (47) 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 "pf").
- 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 the
- following command line parameters, with the same values
- as the corresponding module parameters listed above:
- pf.drive0
- pf.drive1
- pf.drive2
- pf.drive3
- pf.cluster
- pf.nice
- In addition, you can use the parameter pf.disable to disable
- the driver entirely.
- */
- /* Changes:
- 1.01 GRG 1998.05.03 Changes for SMP. Eliminate sti().
- Fix for drives that don't clear STAT_ERR
- until after next CDB delivered.
- Small change in pf_completion to round
- up transfer size.
- 1.02 GRG 1998.06.16 Eliminated an Ugh
- 1.03 GRG 1998.08.16 Use HZ in loop timings, extra debugging
- 1.04 GRG 1998.09.24 Added jumbo support
- */
- #define PF_VERSION "1.04"
- #define PF_MAJOR 47
- #define PF_NAME "pf"
- #define PF_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 = PF_MAJOR;
- static char *name = PF_NAME;
- static int cluster = 64;
- static int nice = 0;
- static int disable = 0;
- static int drive0[7] = {0,0,0,-1,-1,-1,-1};
- static int drive1[7] = {0,0,0,-1,-1,-1,-1};
- static int drive2[7] = {0,0,0,-1,-1,-1,-1};
- static int drive3[7] = {0,0,0,-1,-1,-1,-1};
- static int (*drives[4])[7] = {&drive0,&drive1,&drive2,&drive3};
- static int pf_drive_count;
- #define D_PRT 0
- #define D_PRO 1
- #define D_UNI 2
- #define D_MOD 3
- #define D_SLV 4
- #define D_LUN 5
- #define D_DLY 6
- #define DU (*drives[unit])
- /* end of parameters */
- #include <linux/module.h>
- #include <linux/errno.h>
- #include <linux/fs.h>
- #include <linux/kernel.h>
- #include <linux/delay.h>
- #include <linux/genhd.h>
- #include <linux/hdreg.h>
- #include <linux/cdrom.h>
- #include <linux/spinlock.h>
- #include <asm/uaccess.h>
- #ifndef MODULE
- #include "setup.h"
- static STT pf_stt[7] = {{"drive0",7,drive0},
- {"drive1",7,drive1},
- {"drive2",7,drive2},
- {"drive3",7,drive3},
- {"disable",1,&disable},
- {"cluster",1,&cluster},
- {"nice",1,&nice}};
- void pf_setup( char *str, int *ints)
- { generic_setup(pf_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,"1-7i");
- MODULE_PARM(drive1,"1-7i");
- MODULE_PARM(drive2,"1-7i");
- MODULE_PARM(drive3,"1-7i");
- #include "paride.h"
- /* set up defines for blk.h, why don't all drivers do it this way ? */
- #define MAJOR_NR major
- #define DEVICE_NAME "PF"
- #define DEVICE_REQUEST do_pf_request
- #define DEVICE_NR(device) MINOR(device)
- #define DEVICE_ON(device)
- #define DEVICE_OFF(device)
- #include <linux/blk.h>
- #include <linux/blkpg.h>
- #include "pseudo.h"
- /* constants for faking geometry numbers */
- #define PF_FD_MAX 8192 /* use FD geometry under this size */
- #define PF_FD_HDS 2
- #define PF_FD_SPT 18
- #define PF_HD_HDS 64
- #define PF_HD_SPT 32
- #define PF_MAX_RETRIES 5
- #define PF_TMO 800 /* interrupt timeout in jiffies */
- #define PF_SPIN_DEL 50 /* spin delay in micro-seconds */
- #define PF_SPIN (1000000*PF_TMO)/(HZ*PF_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 ATAPI_REQ_SENSE 0x03
- #define ATAPI_LOCK 0x1e
- #define ATAPI_DOOR 0x1b
- #define ATAPI_MODE_SENSE 0x5a
- #define ATAPI_CAPACITY 0x25
- #define ATAPI_IDENTIFY 0x12
- #define ATAPI_READ_10 0x28
- #define ATAPI_WRITE_10 0x2a
- int pf_init(void);
- #ifdef MODULE
- void cleanup_module( void );
- #endif
- static int pf_open(struct inode *inode, struct file *file);
- static void do_pf_request(request_queue_t * q);
- static int pf_ioctl(struct inode *inode,struct file *file,
- unsigned int cmd, unsigned long arg);
- static int pf_release (struct inode *inode, struct file *file);
- static int pf_detect(void);
- static void do_pf_read(void);
- static void do_pf_read_start(void);
- static void do_pf_write(void);
- static void do_pf_write_start(void);
- static void do_pf_read_drq( void );
- static void do_pf_write_done( void );
- static int pf_identify (int unit);
- static void pf_lock(int unit, int func);
- static void pf_eject(int unit);
- static int pf_check_media(kdev_t dev);
- static int pf_blocksizes[PF_UNITS];
- #define PF_NM 0
- #define PF_RO 1
- #define PF_RW 2
- #define PF_NAMELEN 8
- struct pf_unit {
- struct pi_adapter pia; /* interface to paride layer */
- struct pi_adapter *pi;
- int removable; /* removable media device ? */
- int media_status; /* media present ? WP ? */
- int drive; /* drive */
- int lun;
- int access; /* count of active opens ... */
- int capacity; /* Size of this volume in sectors */
- int present; /* device present ? */
- char name[PF_NAMELEN]; /* pf0, pf1, ... */
- };
- struct pf_unit pf[PF_UNITS];
- /* 'unit' must be defined in all functions - either as a local or a param */
- #define PF pf[unit]
- #define PI PF.pi
- static char pf_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 pf_retries = 0; /* i/o error retry count */
- static int pf_busy = 0; /* request being processed ? */
- static int pf_block; /* address of next requested block */
- static int pf_count; /* number of blocks still to do */
- static int pf_run; /* sectors in current cluster */
- static int pf_cmd; /* current command READ/WRITE */
- static int pf_unit; /* unit of current request */
- static int pf_mask; /* stopper for pseudo-int */
- static char * pf_buf; /* buffer for request in progress */
- /* kernel glue structures */
- static struct block_device_operations pf_fops = {
- owner: THIS_MODULE,
- open: pf_open,
- release: pf_release,
- ioctl: pf_ioctl,
- check_media_change: pf_check_media,
- };
- void pf_init_units( void )
- { int unit, j;
- pf_drive_count = 0;
- for (unit=0;unit<PF_UNITS;unit++) {
- PF.pi = & PF.pia;
- PF.access = 0;
- PF.media_status = PF_NM;
- PF.capacity = 0;
- PF.present = 0;
- PF.drive = DU[D_SLV];
- PF.lun = DU[D_LUN];
- j = 0;
- while ((j < PF_NAMELEN-2) && (PF.name[j]=name[j])) j++;
- PF.name[j++] = '0' + unit;
- PF.name[j] = 0;
- if (DU[D_PRT]) pf_drive_count++;
- }
- }
- static inline int pf_new_segment(request_queue_t *q, struct request *req, int max_segments)
- {
- if (max_segments > cluster)
- max_segments = cluster;
- if (req->nr_segments < max_segments) {
- req->nr_segments++;
- return 1;
- }
- return 0;
- }
- static int pf_back_merge_fn(request_queue_t *q, struct request *req,
- struct buffer_head *bh, int max_segments)
- {
- if (req->bhtail->b_data + req->bhtail->b_size == bh->b_data)
- return 1;
- return pf_new_segment(q, req, max_segments);
- }
- static int pf_front_merge_fn(request_queue_t *q, struct request *req,
- struct buffer_head *bh, int max_segments)
- {
- if (bh->b_data + bh->b_size == req->bh->b_data)
- return 1;
- return pf_new_segment(q, req, max_segments);
- }
- static int pf_merge_requests_fn(request_queue_t *q, struct request *req,
- struct request *next, int max_segments)
- {
- int total_segments = req->nr_segments + next->nr_segments;
- int same_segment;
- if (max_segments > cluster)
- max_segments = cluster;
- same_segment = 0;
- if (req->bhtail->b_data + req->bhtail->b_size == next->bh->b_data) {
- total_segments--;
- same_segment = 1;
- }
-
- if (total_segments > max_segments)
- return 0;
- req->nr_segments = total_segments;
- return 1;
- }
- int pf_init (void) /* preliminary initialisation */
- { int i;
- request_queue_t * q;
- if (disable) return -1;
- pf_init_units();
- if (pf_detect()) return -1;
- pf_busy = 0;
- if (register_blkdev(MAJOR_NR,name,&pf_fops)) {
- printk("pf_init: unable to get major number %dn",
- major);
- return -1;
- }
- q = BLK_DEFAULT_QUEUE(MAJOR_NR);
- blk_init_queue(q, DEVICE_REQUEST);
- q->back_merge_fn = pf_back_merge_fn;
- q->front_merge_fn = pf_front_merge_fn;
- q->merge_requests_fn = pf_merge_requests_fn;
- read_ahead[MAJOR_NR] = 8; /* 8 sector (4kB) read ahead */
-
- for (i=0;i<PF_UNITS;i++) pf_blocksizes[i] = 1024;
- blksize_size[MAJOR_NR] = pf_blocksizes;
- for (i=0;i<PF_UNITS;i++)
- register_disk(NULL, MKDEV(MAJOR_NR, i), 1, &pf_fops, 0);
- return 0;
- }
- static int pf_open (struct inode *inode, struct file *file)
- { int unit = DEVICE_NR(inode->i_rdev);
- if ((unit >= PF_UNITS) || (!PF.present)) return -ENODEV;
- pf_identify(unit);
- if (PF.media_status == PF_NM)
- return -ENODEV;
- if ((PF.media_status == PF_RO) && (file ->f_mode & 2))
- return -EROFS;
- PF.access++;
- if (PF.removable) pf_lock(unit,1);
- return 0;
- }
- static int pf_ioctl(struct inode *inode,struct file *file,
- unsigned int cmd, unsigned long arg)
- { int err, unit;
- struct hd_geometry *geo = (struct hd_geometry *) arg;
- if ((!inode) || (!inode->i_rdev)) return -EINVAL;
- unit = DEVICE_NR(inode->i_rdev);
- if (unit >= PF_UNITS) return -EINVAL;
- if (!PF.present) return -ENODEV;
- switch (cmd) {
- case CDROMEJECT:
- if (PF.access == 1) {
- pf_eject(unit);
- return 0;
- }
- case HDIO_GETGEO:
- if (!geo) return -EINVAL;
- err = verify_area(VERIFY_WRITE,geo,sizeof(*geo));
- if (err) return err;
- if (PF.capacity < PF_FD_MAX) {
- put_user(PF.capacity/(PF_FD_HDS*PF_FD_SPT),
- (short *) &geo->cylinders);
- put_user(PF_FD_HDS, (char *) &geo->heads);
- put_user(PF_FD_SPT, (char *) &geo->sectors);
- } else {
- put_user(PF.capacity/(PF_HD_HDS*PF_HD_SPT),
- (short *) &geo->cylinders);
- put_user(PF_HD_HDS, (char *) &geo->heads);
- put_user(PF_HD_SPT, (char *) &geo->sectors);
- }
- put_user(0,(long *)&geo->start);
- return 0;
- case BLKGETSIZE:
- return put_user(PF.capacity,(long *) arg);
- case BLKGETSIZE64:
- return put_user((u64)PF.capacity << 9,(u64 *)arg);
- case BLKROSET:
- case BLKROGET:
- case BLKRASET:
- case BLKRAGET:
- case BLKFLSBUF:
- return blk_ioctl(inode->i_rdev, cmd, arg);
- default:
- return -EINVAL;
- }
- }
- static int pf_release (struct inode *inode, struct file *file)
- { kdev_t devp;
- int unit;
- devp = inode->i_rdev;
- unit = DEVICE_NR(devp);
- if ((unit >= PF_UNITS) || (PF.access <= 0))
- return -EINVAL;
- PF.access--;
- if (!PF.access && PF.removable)
- pf_lock(unit,0);
- return 0;
- }
- static int pf_check_media( kdev_t dev)
- { return 1;
- }
- #ifdef MODULE
- /* Glue for modules ... */
- void cleanup_module(void);
- int init_module(void)
- { int err;
- #ifdef PARIDE_JUMBO
- { extern paride_init();
- paride_init();
- }
- #endif
- err = pf_init();
- return err;
- }
- void cleanup_module(void)
- { int unit;
- unregister_blkdev(MAJOR_NR,name);
- for (unit=0;unit<PF_UNITS;unit++)
- if (PF.present) pi_release(PI);
- }
- #endif
- #define WR(c,r,v) pi_write_regr(PI,c,r,v)
- #define RR(c,r) (pi_read_regr(PI,c,r))
- #define LUN (0x20*PF.lun)
- #define DRIVE (0xa0+0x10*PF.drive)
- static int pf_wait( int unit, int go, int stop, char * fun, char * msg )
- { int j, r, e, s, p;
- j = 0;
- while ((((r=RR(1,6))&go)||(stop&&(!(r&stop))))&&(j++<PF_SPIN))
- udelay(PF_SPIN_DEL);
- if ((r&(STAT_ERR&stop))||(j>=PF_SPIN)) {
- s = RR(0,7);
- e = RR(0,1);
- p = RR(0,2);
- if (j >= PF_SPIN) e |= 0x100;
- if (fun) printk("%s: %s %s: alt=0x%x stat=0x%x err=0x%x"
- " loop=%d phase=%dn",
- PF.name,fun,msg,r,s,e,j,p);
- return (e<<8)+s;
- }
- return 0;
- }
- static int pf_command( int unit, char * cmd, int dlen, char * fun )
- { pi_connect(PI);
- WR(0,6,DRIVE);
- if (pf_wait(unit,STAT_BUSY|STAT_DRQ,0,fun,"before command")) {
- pi_disconnect(PI);
- return -1;
- }
- WR(0,4,dlen % 256);
- WR(0,5,dlen / 256);
- WR(0,7,0xa0); /* ATAPI packet command */
- if (pf_wait(unit,STAT_BUSY,STAT_DRQ,fun,"command DRQ")) {
- pi_disconnect(PI);
- return -1;
- }
- if (RR(0,2) != 1) {
- printk("%s: %s: command phase errorn",PF.name,fun);
- pi_disconnect(PI);
- return -1;
- }
- pi_write_block(PI,cmd,12);
- return 0;
- }
- static int pf_completion( int unit, char * buf, char * fun )
- { int r, s, n;
- r = pf_wait(unit,STAT_BUSY,STAT_DRQ|STAT_READY|STAT_ERR,
- fun,"completion");
- if ((RR(0,2)&2) && (RR(0,7)&STAT_DRQ)) {
- n = (((RR(0,4)+256*RR(0,5))+3)&0xfffc);
- pi_read_block(PI,buf,n);
- }
- s = pf_wait(unit,STAT_BUSY,STAT_READY|STAT_ERR,fun,"data done");
- pi_disconnect(PI);
- return (r?r:s);
- }
- static void pf_req_sense( int unit, int quiet )
- { char rs_cmd[12] = { ATAPI_REQ_SENSE,LUN,0,0,16,0,0,0,0,0,0,0 };
- char buf[16];
- int r;
- r = pf_command(unit,rs_cmd,16,"Request sense");
- mdelay(1);
- if (!r) pf_completion(unit,buf,"Request sense");
- if ((!r)&&(!quiet))
- printk("%s: Sense key: %x, ASC: %x, ASQ: %xn",
- PF.name,buf[2]&0xf,buf[12],buf[13]);
- }
- static int pf_atapi( int unit, char * cmd, int dlen, char * buf, char * fun )
- { int r;
- r = pf_command(unit,cmd,dlen,fun);
- mdelay(1);
- if (!r) r = pf_completion(unit,buf,fun);
- if (r) pf_req_sense(unit,!fun);
-
- return r;
- }
- #define DBMSG(msg) ((verbose>1)?(msg):NULL)
- static void pf_lock(int unit, int func)
- { char lo_cmd[12] = { ATAPI_LOCK,LUN,0,0,func,0,0,0,0,0,0,0 };
- pf_atapi(unit,lo_cmd,0,pf_scratch,func?"unlock":"lock");
- }
- static void pf_eject( int unit )
- { char ej_cmd[12] = { ATAPI_DOOR,LUN,0,0,2,0,0,0,0,0,0,0 };
- pf_lock(unit,0);
- pf_atapi(unit,ej_cmd,0,pf_scratch,"eject");
- }
- #define PF_RESET_TMO 30 /* in tenths of a second */
- static void pf_sleep( int cs )
- { current->state = TASK_INTERRUPTIBLE;
- schedule_timeout(cs);
- }
- static int pf_reset( int unit )
- /* the ATAPI standard actually specifies the contents of all 7 registers
- after a reset, but the specification is ambiguous concerning the last
- two bytes, and different drives interpret the standard differently.
- */
- { int i, k, flg;
- int expect[5] = {1,1,1,0x14,0xeb};
- pi_connect(PI);
- WR(0,6,DRIVE);
- WR(0,7,8);
- pf_sleep(20*HZ/1000);
- k = 0;
- while ((k++ < PF_RESET_TMO) && (RR(1,6)&STAT_BUSY))
- pf_sleep(HZ/10);
- flg = 1;
- for(i=0;i<5;i++) flg &= (RR(0,i+1) == expect[i]);
- if (verbose) {
- printk("%s: Reset (%d) signature = ",PF.name,k);
- for (i=0;i<5;i++) printk("%3x",RR(0,i+1));
- if (!flg) printk(" (incorrect)");
- printk("n");
- }
-
- pi_disconnect(PI);
- return flg-1;
- }
- static void pf_mode_sense( int unit )
- { char ms_cmd[12] = { ATAPI_MODE_SENSE,LUN,0,0,0,0,0,0,8,0,0,0};
- char buf[8];
- pf_atapi(unit,ms_cmd,8,buf,DBMSG("mode sense"));
- PF.media_status = PF_RW;
- if (buf[3] & 0x80) PF.media_status = PF_RO;
- }
- static void xs( char *buf, char *targ, int offs, int len )
- { int j,k,l;
- j=0; l=0;
- for (k=0;k<len;k++)
- if((buf[k+offs]!=0x20)||(buf[k+offs]!=l))
- l=targ[j++]=buf[k+offs];
- if (l==0x20) j--;
- targ[j]=0;
- }
- static int xl( char *buf, int offs )
- { int v,k;
- v=0;
- for(k=0;k<4;k++) v=v*256+(buf[k+offs]&0xff);
- return v;
- }
- static void pf_get_capacity( int unit )
- { char rc_cmd[12] = { ATAPI_CAPACITY,LUN,0,0,0,0,0,0,0,0,0,0};
- char buf[8];
- int bs;
- if (pf_atapi(unit,rc_cmd,8,buf,DBMSG("get capacity"))) {
- PF.media_status = PF_NM;
- return;
- }
- PF.capacity = xl(buf,0) + 1;
- bs = xl(buf,4);
- if (bs != 512) {
- PF.capacity = 0;
- if (verbose) printk("%s: Drive %d, LUN %d,"
- " unsupported block size %dn",
- PF.name,PF.drive,PF.lun,bs);
- }
- }
- static int pf_identify( int unit )
- { int dt, s;
- char *ms[2] = {"master","slave"};
- char mf[10], id[18];
- char id_cmd[12] = { ATAPI_IDENTIFY,LUN,0,0,36,0,0,0,0,0,0,0};
- char buf[36];
- s = pf_atapi(unit,id_cmd,36,buf,"identify");
- if (s) return -1;
- dt = buf[0] & 0x1f;
- if ((dt != 0) && (dt != 7)) {
- if (verbose)
- printk("%s: Drive %d, LUN %d, unsupported type %dn",
- PF.name,PF.drive,PF.lun,dt);
- return -1;
- }
- xs(buf,mf,8,8);
- xs(buf,id,16,16);
- PF.removable = (buf[1] & 0x80);
- pf_mode_sense(unit);
- pf_mode_sense(unit);
- pf_mode_sense(unit);
- pf_get_capacity(unit);
- printk("%s: %s %s, %s LUN %d, type %d",
- PF.name,mf,id,ms[PF.drive],PF.lun,dt);
- if (PF.removable) printk(", removable");
- if (PF.media_status == PF_NM)
- printk(", no median");
- else { if (PF.media_status == PF_RO) printk(", RO");
- printk(", %d blocksn",PF.capacity);
- }
- return 0;
- }
- static int pf_probe( int unit )
- /* returns 0, with id set if drive is detected
- -1, if drive detection failed
- */
- { if (PF.drive == -1) {
- for (PF.drive=0;PF.drive<=1;PF.drive++)
- if (!pf_reset(unit)) {
- if (PF.lun != -1) return pf_identify(unit);
- else for (PF.lun=0;PF.lun<8;PF.lun++)
- if (!pf_identify(unit)) return 0;
- }
- } else {
- if (pf_reset(unit)) return -1;
- if (PF.lun != -1) return pf_identify(unit);
- for (PF.lun=0;PF.lun<8;PF.lun++)
- if (!pf_identify(unit)) return 0;
- }
- return -1;
- }
- static int pf_detect( void )
- { int k, unit;
- printk("%s: %s version %s, major %d, cluster %d, nice %dn",
- name,name,PF_VERSION,major,cluster,nice);
- k = 0;
- if (pf_drive_count == 0) {
- unit = 0;
- if (pi_init(PI,1,-1,-1,-1,-1,-1,pf_scratch,
- PI_PF,verbose,PF.name)) {
- if (!pf_probe(unit)) {
- PF.present = 1;
- k++;
- } else pi_release(PI);
- }
- } else for (unit=0;unit<PF_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],pf_scratch,PI_PF,verbose,
- PF.name)) {
- if (!pf_probe(unit)) {
- PF.present = 1;
- k++;
- } else pi_release(PI);
- }
- if (k) return 0;
- printk("%s: No ATAPI disk detectedn",name);
- return -1;
- }
- /* The i/o request engine */
- static int pf_start( int unit, int cmd, int b, int c )
- { int i;
- char io_cmd[12] = {cmd,LUN,0,0,0,0,0,0,0,0,0,0};
- for(i=0;i<4;i++) {
- io_cmd[5-i] = b & 0xff;
- b = b >> 8;
- }
-
- io_cmd[8] = c & 0xff;
- io_cmd[7] = (c >> 8) & 0xff;
- i = pf_command(unit,io_cmd,c*512,"start i/o");
- mdelay(1);
- return i;
- }
- static int pf_ready( void )
- { int unit = pf_unit;
- return (((RR(1,6)&(STAT_BUSY|pf_mask)) == pf_mask));
- }
- static void do_pf_request (request_queue_t * q)
- { struct buffer_head * bh;
- int unit;
- if (pf_busy) return;
- repeat:
- if (QUEUE_EMPTY || (CURRENT->rq_status == RQ_INACTIVE)) return;
- INIT_REQUEST;
- pf_unit = unit = DEVICE_NR(CURRENT->rq_dev);
- pf_block = CURRENT->sector;
- pf_run = CURRENT->nr_sectors;
- pf_count = CURRENT->current_nr_sectors;
- bh = CURRENT->bh;
- if ((pf_unit >= PF_UNITS) || (pf_block+pf_count > PF.capacity)) {
- end_request(0);
- goto repeat;
- }
- pf_cmd = CURRENT->cmd;
- pf_buf = CURRENT->buffer;
- pf_retries = 0;
- pf_busy = 1;
- if (pf_cmd == READ) pi_do_claimed(PI,do_pf_read);
- else if (pf_cmd == WRITE) pi_do_claimed(PI,do_pf_write);
- else { pf_busy = 0;
- end_request(0);
- goto repeat;
- }
- }
- static void pf_next_buf( int unit )
- { unsigned long saved_flags;
- spin_lock_irqsave(&io_request_lock,saved_flags);
- end_request(1);
- if (!pf_run) { spin_unlock_irqrestore(&io_request_lock,saved_flags);
- return;
- }
-
- /* paranoia */
- if (QUEUE_EMPTY ||
- (CURRENT->cmd != pf_cmd) ||
- (DEVICE_NR(CURRENT->rq_dev) != pf_unit) ||
- (CURRENT->rq_status == RQ_INACTIVE) ||
- (CURRENT->sector != pf_block))
- printk("%s: OUCH: request list changed unexpectedlyn",
- PF.name);
- pf_count = CURRENT->current_nr_sectors;
- pf_buf = CURRENT->buffer;
- spin_unlock_irqrestore(&io_request_lock,saved_flags);
- }
- static void do_pf_read( void )
- /* detach from the calling context - in case the spinlock is held */
- { ps_set_intr(do_pf_read_start,0,0,nice);
- }
- static void do_pf_read_start( void )
- { int unit = pf_unit;
- unsigned long saved_flags;
- pf_busy = 1;
- if (pf_start(unit,ATAPI_READ_10,pf_block,pf_run)) {
- pi_disconnect(PI);
- if (pf_retries < PF_MAX_RETRIES) {
- pf_retries++;
- pi_do_claimed(PI,do_pf_read_start);
- return;
- }
- spin_lock_irqsave(&io_request_lock,saved_flags);
- end_request(0);
- pf_busy = 0;
- do_pf_request(NULL);
- spin_unlock_irqrestore(&io_request_lock,saved_flags);
- return;
- }
- pf_mask = STAT_DRQ;
- ps_set_intr(do_pf_read_drq,pf_ready,PF_TMO,nice);
- }
- static void do_pf_read_drq( void )
- { int unit = pf_unit;
- unsigned long saved_flags;
-
- while (1) {
- if (pf_wait(unit,STAT_BUSY,STAT_DRQ|STAT_ERR,
- "read block","completion") & STAT_ERR) {
- pi_disconnect(PI);
- if (pf_retries < PF_MAX_RETRIES) {
- pf_req_sense(unit,0);
- pf_retries++;
- pi_do_claimed(PI,do_pf_read_start);
- return;
- }
- spin_lock_irqsave(&io_request_lock,saved_flags);
- end_request(0);
- pf_busy = 0;
- do_pf_request(NULL);
- spin_unlock_irqrestore(&io_request_lock,saved_flags);
- return;
- }
- pi_read_block(PI,pf_buf,512);
- pf_count--; pf_run--;
- pf_buf += 512;
- pf_block++;
- if (!pf_run) break;
- if (!pf_count) pf_next_buf(unit);
- }
- pi_disconnect(PI);
- spin_lock_irqsave(&io_request_lock,saved_flags);
- end_request(1);
- pf_busy = 0;
- do_pf_request(NULL);
- spin_unlock_irqrestore(&io_request_lock,saved_flags);
- }
- static void do_pf_write( void )
- { ps_set_intr(do_pf_write_start,0,0,nice);
- }
- static void do_pf_write_start( void )
- { int unit = pf_unit;
- unsigned long saved_flags;
- pf_busy = 1;
- if (pf_start(unit,ATAPI_WRITE_10,pf_block,pf_run)) {
- pi_disconnect(PI);
- if (pf_retries < PF_MAX_RETRIES) {
- pf_retries++;
- pi_do_claimed(PI,do_pf_write_start);
- return;
- }
- spin_lock_irqsave(&io_request_lock,saved_flags);
- end_request(0);
- pf_busy = 0;
- do_pf_request(NULL);
- spin_unlock_irqrestore(&io_request_lock,saved_flags);
- return;
- }
- while (1) {
- if (pf_wait(unit,STAT_BUSY,STAT_DRQ|STAT_ERR,
- "write block","data wait") & STAT_ERR) {
- pi_disconnect(PI);
- if (pf_retries < PF_MAX_RETRIES) {
- pf_retries++;
- pi_do_claimed(PI,do_pf_write_start);
- return;
- }
- spin_lock_irqsave(&io_request_lock,saved_flags);
- end_request(0);
- pf_busy = 0;
- do_pf_request(NULL);
- spin_unlock_irqrestore(&io_request_lock,saved_flags);
- return;
- }
- pi_write_block(PI,pf_buf,512);
- pf_count--; pf_run--;
- pf_buf += 512;
- pf_block++;
- if (!pf_run) break;
- if (!pf_count) pf_next_buf(unit);
- }
- pf_mask = 0;
- ps_set_intr(do_pf_write_done,pf_ready,PF_TMO,nice);
- }
- static void do_pf_write_done( void )
- { int unit = pf_unit;
- unsigned long saved_flags;
- if (pf_wait(unit,STAT_BUSY,0,"write block","done") & STAT_ERR) {
- pi_disconnect(PI);
- if (pf_retries < PF_MAX_RETRIES) {
- pf_retries++;
- pi_do_claimed(PI,do_pf_write_start);
- return;
- }
- spin_lock_irqsave(&io_request_lock,saved_flags);
- end_request(0);
- pf_busy = 0;
- do_pf_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);
- pf_busy = 0;
- do_pf_request(NULL);
- spin_unlock_irqrestore(&io_request_lock,saved_flags);
- }
- /* end of pf.c */
- MODULE_LICENSE("GPL");