cregit-Linux how code gets into the kernel

Release 4.11 drivers/block/paride/pd.c

Directory: drivers/block/paride
/* 
        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 override 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.

*/
#include <linux/types.h>


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};









enum {D_PRT, D_PRO, D_UNI, D_MOD, D_GEO, D_SBY, D_DLY, D_SLV};

/* end of parameters */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/gfp.h>
#include <linux/fs.h>
#include <linux/delay.h>
#include <linux/hdreg.h>
#include <linux/cdrom.h>	/* for the eject ioctl */
#include <linux/blkdev.h>
#include <linux/blkpg.h>
#include <linux/kernel.h>
#include <linux/mutex.h>
#include <linux/uaccess.h>
#include <linux/workqueue.h>

static DEFINE_MUTEX(pd_mutex);
static DEFINE_SPINLOCK(pd_lock);

module_param(verbose, int, 0);
module_param(major, int, 0);
module_param(name, charp, 0);
module_param(cluster, int, 0);
module_param(nice, int, 0);
module_param_array(drive0, int, NULL, 0);
module_param_array(drive1, int, NULL, 0);
module_param_array(drive2, int, NULL, 0);
module_param_array(drive3, int, NULL, 0);

#include "paride.h"


#define PD_BITS    4

/* 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


#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 can_lba;
	
int drive;		/* master=0 slave=1 */
	
int changed;		/* Have we seen a disk change ? */
	
int removable;		/* removable media device  ?  */
	
int standby;
	
int alt_geom;
	
char name[PD_NAMELEN];	/* pda, pdb, etc ... */
	
struct gendisk *gd;
};


static struct pd_unit pd[PD_UNITS];


static char pd_scratch[512];	
/* scratch block buffer */


static char *pd_errs[17] = { "ERR", "INDEX", "ECC", "DRQ", "SEEK", "WRERR",
	"READY", "BUSY", "AMNF", "TK0NF", "ABRT", "MCR",
	"IDNF", "MC", "UNC", "???", "TMO"
};


static void *par_drv;		
/* reference of parport driver */




static inline int status_reg(struct pd_unit *disk)
{
	return pi_read_regr(disk->pi, 1, 6);
}


Contributors
PersonTokensPropCommitsCommitProp
Al Viro1458.33%250.00%


Linus Torvalds (pre-git)1041.67%250.00%


Total24100.00%4100.00%






static inline int read_reg(struct pd_unit *disk, int reg)
{
	return pi_read_regr(disk->pi, 0, reg);
}


Contributors
PersonTokensPropCommitsCommitProp
Al Viro1866.67%133.33%


Linus Torvalds (pre-git)933.33%266.67%


Total27100.00%3100.00%






static inline void write_status(struct pd_unit *disk, int val)
{
	pi_write_regr(disk->pi, 1, 6, val);
}


Contributors
PersonTokensPropCommitsCommitProp
Al Viro2278.57%450.00%


Linus Torvalds (pre-git)517.86%337.50%


Linus Torvalds13.57%112.50%


Total28100.00%8100.00%






static inline void write_reg(struct pd_unit *disk, int reg, int val)
{
	pi_write_regr(disk->pi, 0, reg, val);
}


Contributors
PersonTokensPropCommitsCommitProp
Al Viro1961.29%250.00%


Linus Torvalds (pre-git)1238.71%250.00%


Total31100.00%4100.00%






static inline u8 DRIVE(struct pd_unit *disk)
{
	return 0xa0+0x10*disk->drive;
}


Contributors
PersonTokensPropCommitsCommitProp
Al Viro1780.95%266.67%


Linus Torvalds (pre-git)419.05%133.33%


Total21100.00%3100.00%



/*  ide command interface */




static void pd_print_error(struct pd_unit *disk, char *msg, int status)
{
	int i;

	printk("%s: %s: status = 0x%x =", disk->name, msg, status);
	for (i = 0; i < ARRAY_SIZE(pd_errs); i++)
		if (status & (1 << i))
			printk(" %s", pd_errs[i]);
	printk("\n");
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)5674.67%240.00%


Al Viro1520.00%240.00%


Adrian Bunk45.33%120.00%


Total75100.00%5100.00%






static void pd_reset(struct pd_unit *disk)
{				/* called only for MASTER drive */
	write_status(disk, 4);
	udelay(50);
	write_status(disk, 0);
	udelay(250);
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)2775.00%133.33%


Al Viro925.00%266.67%


Total36100.00%3100.00%




#define DBMSG(msg)	((verbose>1)?(msg):NULL)




static int pd_wait_for(struct pd_unit *disk, int w, char *msg)
{				/* polled wait */
	int k, r, e;

	k = 0;
	while (k < PD_SPIN) {
		r = status_reg(disk);
		k++;
		if (((r & w) == w) && !(r & STAT_BUSY))
			break;
		udelay(PD_SPIN_DEL);
	}
	e = (read_reg(disk, 1) << 8) + read_reg(disk, 7);
	if (k >= PD_SPIN)
		e |= ERR_TMO;
	if ((e & (STAT_ERR | ERR_TMO)) && (msg != NULL))
		pd_print_error(disk, msg, e);
	return e;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)12190.98%250.00%


Al Viro129.02%250.00%


Total133100.00%4100.00%






static void pd_send_command(struct pd_unit *disk, int n, int s, int h, int c0, int c1, int func)
{
	write_reg(disk, 6, DRIVE(disk) + h);
	write_reg(disk, 1, 0);		/* the IDE task file */
	write_reg(disk, 2, n);
	write_reg(disk, 3, s);
	write_reg(disk, 4, c0);
	write_reg(disk, 5, c1);
	write_reg(disk, 7, func);

	udelay(1);
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)8279.61%375.00%


Al Viro2120.39%125.00%


Total103100.00%4100.00%






static void pd_ide_command(struct pd_unit *disk, int func, int block, int count)
{
	int c1, c0, h, s;

	if (disk->can_lba) {
		s = block & 255;
		c0 = (block >>= 8) & 255;
		c1 = (block >>= 8) & 255;
		h = ((block >>= 8) & 15) + 0x40;
	} else {
		s = (block % disk->sectors) + 1;
		h = (block /= disk->sectors) % disk->heads;
		c0 = (block /= disk->heads) % 256;
		c1 = (block >>= 8);
	}
	pd_send_command(disk, count, s, h, c0, c1, func);
}


Contributors
PersonTokensPropCommitsCommitProp
Al Viro7451.75%360.00%


Linus Torvalds (pre-git)6948.25%240.00%


Total143100.00%5100.00%



/* The i/o request engine */






enum action {Fail = 0, Ok = 1, Hold, Wait};


static struct request *pd_req;	
/* current request */

static enum action (*phase)(void);

static void run_fsm(void);

static void ps_tq_int(struct work_struct *work);

static DECLARE_DELAYED_WORK(fsm_tq, ps_tq_int);




static void schedule_fsm(void)
{
	if (!nice)
		schedule_delayed_work(&fsm_tq, 0);
	else
		schedule_delayed_work(&fsm_tq, nice-1);
}


Contributors
PersonTokensPropCommitsCommitProp
Al Viro2990.62%150.00%


David Howells39.38%150.00%


Total32100.00%2100.00%






static void ps_tq_int(struct work_struct *work)
{
	run_fsm();
}


Contributors
PersonTokensPropCommitsCommitProp
Al Viro1178.57%150.00%


David Howells321.43%150.00%


Total14100.00%2100.00%



static enum action do_pd_io_start(void);
static enum action pd_special(void);
static enum action do_pd_read_start(void);
static enum action do_pd_write_start(void);
static enum action do_pd_read_drq(void);
static enum action do_pd_write_done(void);


static struct request_queue *pd_queue;

static int pd_claimed;


static struct pd_unit *pd_current; 
/* current request's drive */

static PIA *pi_current; 
/* current request's PIA */




static void run_fsm(void)
{
	while (1) {
		enum action res;
		unsigned long saved_flags;
		int stop = 0;

		if (!phase) {
			pd_current = pd_req->rq_disk->private_data;
			pi_current = pd_current->pi;
			phase = do_pd_io_start;
		}

		switch (pd_claimed) {
			case 0:
				pd_claimed = 1;
				if (!pi_schedule_claimed(pi_current, run_fsm))
					return;
			case 1:
				pd_claimed = 2;
				pi_current->proto->connect(pi_current);
		}

		switch(res = phase()) {
			case Ok: case Fail:
				pi_disconnect(pi_current);
				pd_claimed = 0;
				phase = NULL;
				spin_lock_irqsave(&pd_lock, saved_flags);
				if (!__blk_end_request_cur(pd_req,
						res == Ok ? 0 : -EIO)) {
					pd_req = blk_fetch_request(pd_queue);
					if (!pd_req)
						stop = 1;
				}
				spin_unlock_irqrestore(&pd_lock, saved_flags);
				if (stop)
					return;
			case Hold:
				schedule_fsm();
				return;
			case Wait:
				pi_disconnect(pi_current);
				pd_claimed = 0;
		}
	}
}


Contributors
PersonTokensPropCommitsCommitProp
Al Viro18092.31%125.00%


Tejun Heo157.69%375.00%


Total195100.00%4100.00%




static int pd_retries = 0;	
/* i/o error retry count */

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 char *pd_buf;		
/* buffer for request in progress */




static enum action do_pd_io_start(void)
{
	switch (req_op(pd_req)) {
	case REQ_OP_DRV_IN:
		phase = pd_special;
		return pd_special();
	case REQ_OP_READ:
	case REQ_OP_WRITE:
		pd_block = blk_rq_pos(pd_req);
		pd_count = blk_rq_cur_sectors(pd_req);
		if (pd_block + pd_count > get_capacity(pd_req->rq_disk))
			return Fail;
		pd_run = blk_rq_sectors(pd_req);
		pd_buf = bio_data(pd_req->bio);
		pd_retries = 0;
		if (req_op(pd_req) == REQ_OP_READ)
			return do_pd_read_start();
		else
			return do_pd_write_start();
	}
	return Fail;
}


Contributors
PersonTokensPropCommitsCommitProp
Al Viro7570.75%240.00%


Christoph Hellwig1816.98%120.00%


Tejun Heo98.49%120.00%


Jens Axboe43.77%120.00%


Total106100.00%5100.00%






static enum action pd_special(void)
{
	enum action (*func)(struct pd_unit *) = pd_req->special;
	return func(pd_current);
}


Contributors
PersonTokensPropCommitsCommitProp
Al Viro31100.00%1100.00%


Total31100.00%1100.00%






static int pd_next_buf(void)
{
	unsigned long saved_flags;

	pd_count--;
	pd_run--;
	pd_buf += 512;
	pd_block++;
	if (!pd_run)
		return 1;
	if (pd_count)
		return 0;
	spin_lock_irqsave(&pd_lock, saved_flags);
	__blk_end_request_cur(pd_req, 0);
	pd_count = blk_rq_cur_sectors(pd_req);
	pd_buf = bio_data(pd_req->bio);
	spin_unlock_irqrestore(&pd_lock, saved_flags);
	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Al Viro7389.02%125.00%


Tejun Heo56.10%250.00%


Jens Axboe44.88%125.00%


Total82100.00%4100.00%




static unsigned long pd_timeout;




static enum action do_pd_read_start(void)
{
	if (pd_wait_for(pd_current, STAT_READY, "do_pd_read") & STAT_ERR) {
		if (pd_retries < PD_MAX_RETRIES) {
			pd_retries++;
			return Wait;
		}
		return Fail;
	}
	pd_ide_command(pd_current, IDE_READ, pd_block, pd_run);
	phase = do_pd_read_drq;
	pd_timeout = jiffies + PD_TMO;
	return Hold;
}


Contributors
PersonTokensPropCommitsCommitProp
Al Viro65100.00%1100.00%


Total65100.00%1100.00%






static enum action do_pd_write_start(void)
{
	if (pd_wait_for(pd_current, STAT_READY, "do_pd_write") & STAT_ERR) {
		if (pd_retries < PD_MAX_RETRIES) {
			pd_retries++;
			return Wait;
		}
		return Fail;
	}
	pd_ide_command(pd_current, IDE_WRITE, pd_block, pd_run);
	while (1) {
		if (pd_wait_for(pd_current, STAT_DRQ, "do_pd_write_drq") & STAT_ERR) {
			if (pd_retries < PD_MAX_RETRIES) {
				pd_retries++;
				return Wait;
			}
			return Fail;
		}
		pi_write_block(pd_current->pi, pd_buf, 512);
		if (pd_next_buf())
			break;
	}
	phase = do_pd_write_done;
	pd_timeout = jiffies + PD_TMO;
	return Hold;
}


Contributors
PersonTokensPropCommitsCommitProp
Al Viro11696.67%150.00%


Linus Torvalds (pre-git)43.33%150.00%


Total120100.00%2100.00%






static inline int pd_ready(void)
{
	return !(status_reg(pd_current) & STAT_BUSY);
}


Contributors
PersonTokensPropCommitsCommitProp
Al Viro1470.00%133.33%


Linus Torvalds (pre-git)630.00%266.67%


Total20100.00%3100.00%






static enum action do_pd_read_drq(void)
{
	if (!pd_ready() && !time_after_eq(jiffies, pd_timeout))
		return Hold;

	while (1) {
		if (pd_wait_for(pd_current, STAT_DRQ, "do_pd_read_drq") & STAT_ERR) {
			if (pd_retries < PD_MAX_RETRIES) {
				pd_retries++;
				phase = do_pd_read_start;
				return Wait;
			}
			return Fail;
		}
		pi_read_block(pd_current->pi, pd_buf, 512);
		if (pd_next_buf())
			break;
	}
	return Ok;
}


Contributors
PersonTokensPropCommitsCommitProp
Al Viro7484.09%250.00%


Linus Torvalds (pre-git)1415.91%250.00%


Total88100.00%4100.00%






static enum action do_pd_write_done(void)
{
	if (!pd_ready() && !time_after_eq(jiffies, pd_timeout))
		return Hold;

	if (pd_wait_for(pd_current, STAT_READY, "do_pd_write_done") & STAT_ERR) {
		if (pd_retries < PD_MAX_RETRIES) {
			pd_retries++;
			phase = do_pd_write_start;
			return Wait;
		}
		return Fail;
	}
	return Ok;
}


Contributors
PersonTokensPropCommitsCommitProp
Al Viro4467.69%133.33%


Linus Torvalds (pre-git)2132.31%266.67%


Total65100.00%3100.00%



/* special io requests */

/* 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(struct pd_unit *disk)
{
	pd_wait_for(disk, 0, DBMSG("before init_dev_parms"));
	pd_send_command(disk, disk->sectors, 0, disk->heads - 1, 0, 0,
			IDE_INIT_DEV_PARMS);
	udelay(300);
	pd_wait_for(disk, 0, "Initialise device parameters");
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)3965.00%133.33%


Al Viro2135.00%266.67%


Total60100.00%3100.00%






static enum action pd_door_lock(struct pd_unit *disk)
{
	if (!(pd_wait_for(disk, STAT_READY, "Lock") & STAT_ERR)) {
		pd_send_command(disk, 1, 0, 0, 0, 0, IDE_DOORLOCK);
		pd_wait_for(disk, STAT_READY, "Lock done");
	}
	return Ok;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)3762.71%240.00%


Al Viro2237.29%360.00%


Total59100.00%5100.00%






static enum action pd_door_unlock(struct pd_unit *disk)
{
	if (!(pd_wait_for(disk, STAT_READY, "Lock") & STAT_ERR)) {
		pd_send_command(disk, 1, 0, 0, 0, 0, IDE_DOORUNLOCK);
		pd_wait_for(disk, STAT_READY, "Lock done");
	}
	return Ok;
}


Contributors
PersonTokensPropCommitsCommitProp
Al Viro5898.31%375.00%


Linus Torvalds (pre-git)11.69%125.00%


Total59100.00%4100.00%






static enum action pd_eject(struct pd_unit *disk)
{
	pd_wait_for(disk, 0, DBMSG("before unlock on eject"));
	pd_send_command(disk, 1, 0, 0, 0, 0, IDE_DOORUNLOCK);
	pd_wait_for(disk, 0, DBMSG("after unlock on eject"));
	pd_wait_for(disk, 0, DBMSG("before eject"));
	pd_send_command(disk, 0, 0, 0, 0, 0, IDE_EJECT);
	pd_wait_for(disk, 0, DBMSG("after eject"));
	return Ok;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)6870.10%350.00%


Al Viro2929.90%350.00%


Total97100.00%6100.00%






static enum action pd_media_check(struct pd_unit *disk)
{
	int r = pd_wait_for(disk, STAT_READY, DBMSG("before media_check"));
	if (!(r & STAT_ERR)) {
		pd_send_command(disk, 1, 1, 0, 0, 0, IDE_READ_VRFY);
		r = pd_wait_for(disk, STAT_READY, DBMSG("RDY after READ_VRFY"));
	} else
		disk->changed = 1;	/* say changed if other error */
	if (r & ERR_MC) {
		disk->changed = 1;
		pd_send_command(disk, 1, 0, 0, 0, 0, IDE_ACKCHANGE);
		pd_wait_for(disk, STAT_READY, DBMSG("RDY after ACKCHANGE"));
		pd_send_command(disk, 1, 1, 0, 0, 0, IDE_READ_VRFY);
		r = pd_wait_for(disk, STAT_READY, DBMSG("RDY after VRFY"));
	}
	return Ok;
}


Contributors
PersonTokensPropCommitsCommitProp
Al Viro9964.29%457.14%


Linus Torvalds (pre-git)5535.71%342.86%


Total154100.00%7100.00%






static void pd_standby_off(struct pd_unit *disk)
{
	pd_wait_for(disk, 0, DBMSG("before STANDBY"));
	pd_send_command(disk, 0, 0, 0, 0, 0, IDE_STANDBY);
	pd_wait_for(disk, 0, DBMSG("after STANDBY"));
}


Contributors
PersonTokensPropCommitsCommitProp
Al Viro3873.08%250.00%


Linus Torvalds (pre-git)1426.92%250.00%


Total52100.00%4100.00%






static enum action pd_identify(struct pd_unit *disk)
{
	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 (disk->drive == 0)
		pd_reset(disk);

	write_reg(disk, 6, DRIVE(disk));
	pd_wait_for(disk, 0, DBMSG("before IDENT"));
	pd_send_command(disk, 1, 0, 0, 0, 0, IDE_IDENTIFY);

	if (pd_wait_for(disk, STAT_DRQ, DBMSG("IDENT DRQ")) & STAT_ERR)
		return Fail;
	pi_read_block(disk->pi, pd_scratch, 512);
	disk->can_lba = pd_scratch[99] & 2;
	disk->sectors = le16_to_cpu(*(__le16 *) (pd_scratch + 12));
	disk->heads = le16_to_cpu(*(__le16 *) (pd_scratch + 6));
	disk->cylinders = le16_to_cpu(*(__le16 *) (pd_scratch + 2));
	if (disk->can_lba)
		disk->capacity = le32_to_cpu(*(__le32 *) (pd_scratch + 120));
	else
		disk->capacity = disk->sectors * disk->heads * disk->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;

	disk->removable = pd_scratch[0] & 0x80;

	printk("%s: %s, %s, %d blocks [%dM], (%d/%d/%d), %s media\n",
	       disk->name, id,
	       disk->drive ? "slave" : "master",
	       disk->capacity, disk->capacity / 2048,
	       disk->cylinders, disk->heads, disk->sectors,
	       disk->removable ? "removable" : "fixed");

	if (disk->capacity)
		pd_init_dev_parms(disk);
	if (!disk->standby)
		pd_standby_off(disk);

	return Ok;
}


Contributors
PersonTokensPropCommitsCommitProp
Al Viro29781.82%457.14%


Linus Torvalds (pre-git)6618.18%342.86%


Total363100.00%7100.00%



/* end of io request engine */




static void do_pd_request(struct request_queue * q)
{
	if (pd_req)
		return;
	pd_req = blk_fetch_request(q);
	if (!pd_req)
		return;

	schedule_fsm();
}


Contributors
PersonTokensPropCommitsCommitProp
Al Viro2990.62%250.00%


Jens Axboe26.25%125.00%


Tejun Heo13.12%125.00%


Total32100.00%4100.00%




static int pd_special_command(struct pd_unit *disk,
		      enum action (*func)(struct pd_unit *disk))
{
	struct request *rq;
	int err = 0;

	rq = blk_get_request(disk->gd->queue, REQ_OP_DRV_IN, __GFP_RECLAIM);
	if (IS_ERR(rq))
		return PTR_ERR(rq);

	rq->special = func;

	err = blk_execute_rq(disk->gd->queue, disk->gd, rq, 0);

	blk_put_request(rq);
	return err;
}

/* kernel glue structures */




static int pd_open(struct block_device *bdev, fmode_t mode)
{
	struct pd_unit *disk = bdev->bd_disk->private_data;

	mutex_lock(&pd_mutex);
	disk->access++;

	if (disk->removable) {
		pd_special_command(disk, pd_media_check);
		pd_special_command(disk, pd_door_lock);
	}
	mutex_unlock(&pd_mutex);
	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Al Viro5582.09%571.43%


Arnd Bergmann1217.91%228.57%


Total67100.00%7100.00%






static int pd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
{
	struct pd_unit *disk = bdev->bd_disk->private_data;

	if (disk->alt_geom) {
		geo->heads = PD_LOG_HEADS;
		geo->sectors = PD_LOG_SECTS;
		geo->cylinders = disk->capacity / (geo->heads * geo->sectors);
	} else {
		geo->heads = disk->heads;
		geo->sectors = disk->sectors;
		geo->cylinders = disk->cylinders;
	}

	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Al Viro6972.63%787.50%


Christoph Hellwig2627.37%112.50%


Total95100.00%8100.00%






static int pd_ioctl(struct block_device *bdev, fmode_t mode,
	 unsigned int cmd, unsigned long arg)
{
	struct pd_unit *disk = bdev->bd_disk->private_data;

	switch (cmd) {
	case CDROMEJECT:
		mutex_lock(&pd_mutex);
		if (disk->access == 1)
			pd_special_command(disk, pd_eject);
		mutex_unlock(&pd_mutex);
		return 0;
	default:
		return -EINVAL;
	}
}


Contributors
PersonTokensPropCommitsCommitProp
Christoph Hellwig4558.44%114.29%


Arnd Bergmann1215.58%228.57%


Al Viro1012.99%228.57%


Linus Torvalds (pre-git)1012.99%228.57%


Total77100.00%7100.00%






static void pd_release(struct gendisk *p, fmode_t mode)
{
	struct pd_unit *disk = p->private_data;

	mutex_lock(&pd_mutex);
	if (!--disk->access && disk->removable)
		pd_special_command(disk, pd_door_unlock);
	mutex_unlock(&pd_mutex);
}


Contributors
PersonTokensPropCommitsCommitProp
Al Viro3361.11%444.44%


Arnd Bergmann1222.22%222.22%


Linus Torvalds (pre-git)916.67%333.33%


Total54100.00%9100.00%






static unsigned int pd_check_events(struct gendisk *p, unsigned int clearing)
{
	struct pd_unit *disk = p->private_data;
	int r;
	if (!disk->removable)
		return 0;
	pd_special_command(disk, pd_media_check);
	r = disk->changed;
	disk->changed = 0;
	return r ? DISK_EVENT_MEDIA_CHANGE : 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Al Viro5484.38%583.33%


Tejun Heo1015.62%116.67%


Total64100.00%6100.00%






static int pd_revalidate(struct gendisk *p)
{
	struct pd_unit *disk = p->private_data;
	if (pd_special_command(disk, pd_identify) == 0)
		set_capacity(p, disk->capacity);
	else
		set_capacity(p, 0);
	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Al Viro51100.00%4100.00%


Total51100.00%4100.00%




static const struct block_device_operations pd_fops = {
	.owner		= THIS_MODULE,
	.open		= pd_open,
	.release	= pd_release,
	.ioctl		= pd_ioctl,
	.getgeo		= pd_getgeo,
	.check_events	= pd_check_events,
	.revalidate_disk= pd_revalidate
};

/* probing */




static void pd_probe_drive(struct pd_unit *disk)
{
	struct gendisk *p = alloc_disk(1 << PD_BITS);
	if (!p)
		return;
	strcpy(p->disk_name, disk->name);
	p->fops = &pd_fops;
	p->major = major;
	p->first_minor = (disk - pd) << PD_BITS;
	disk->gd = p;
	p->private_data = disk;
	p->queue = pd_queue;

	if (disk->drive == -1) {
		for (disk->drive = 0; disk->drive <= 1; disk->drive++)
			if (pd_special_command(disk, pd_identify) == 0)
				return;
	} else if (pd_special_command(disk, pd_identify) == 0)
		return;
	disk->gd = NULL;
	put_disk(p);
}


Contributors
PersonTokensPropCommitsCommitProp
Al Viro13489.93%457.14%


Linus Torvalds (pre-git)1510.07%342.86%


Total149100.00%7100.00%






static int pd_detect(void)
{
	int found = 0, unit, pd_drive_count = 0;
	struct pd_unit *disk;

	for (unit = 0; unit < PD_UNITS; unit++) {
		int *parm = *drives[unit];
		struct pd_unit *disk = pd + unit;
		disk->pi = &disk->pia;
		disk->access = 0;
		disk->changed = 1;
		disk->capacity = 0;
		disk->drive = parm[D_SLV];
		snprintf(disk->name, PD_NAMELEN, "%s%c", name, 'a'+unit);
		disk->alt_geom = parm[D_GEO];
		disk->standby = parm[D_SBY];
		if (parm[D_PRT])
			pd_drive_count++;
	}

	par_drv = pi_register_driver(name);
	if (!par_drv) {
		pr_err("failed to register %s driver\n", name);
		return -1;
	}

	if (pd_drive_count == 0) { /* nothing spec'd - so autoprobe for 1 */
		disk = pd;
		if (pi_init(disk->pi, 1, -1, -1, -1, -1, -1, pd_scratch,
			    PI_PD, verbose, disk->name)) {
			pd_probe_drive(disk);
			if (!disk->gd)
				pi_release(disk->pi);
		}

	} else {
		for (unit = 0, disk = pd; unit < PD_UNITS; unit++, disk++) {
			int *parm = *drives[unit];
			if (!parm[D_PRT])
				continue;
			if (pi_init(disk->pi, 0, parm[D_PRT], parm[D_MOD],
				     parm[D_UNI], parm[D_PRO], parm[D_DLY],
				     pd_scratch, PI_PD, verbose, disk->name)) {
				pd_probe_drive(disk);
				if (!disk->gd)
					pi_release(disk->pi);
			}
		}
	}
	for (unit = 0, disk = pd; unit < PD_UNITS; unit++, disk++) {
		if (disk->gd) {
			set_capacity(disk->gd, disk->capacity);
			add_disk(disk->gd);
			found = 1;
		}
	}
	if (!found) {
		printk("%s: no valid drive found\n", name);
		pi_unregister_driver(par_drv);
	}
	return found;
}


Contributors
PersonTokensPropCommitsCommitProp
Al Viro33980.91%969.23%


Linus Torvalds (pre-git)4811.46%323.08%


Sudip Mukherjee327.64%17.69%


Total419100.00%13100.00%






static int __init pd_init(void)
{
	if (disable)
		goto out1;

	pd_queue = blk_init_queue(do_pd_request, &pd_lock);
	if (!pd_queue)
		goto out1;

	blk_queue_max_hw_sectors(pd_queue, cluster);

	if (register_blkdev(major, name))
		goto out2;

	printk("%s: %s version %s, major %d, cluster %d, nice %d\n",
	       name, name, PD_VERSION, major, cluster, nice);
	if (!pd_detect())
		goto out3;

	return 0;

out3:
	unregister_blkdev(major, name);
out2:
	blk_cleanup_queue(pd_queue);
out1:
	return -ENODEV;
}


Contributors
PersonTokensPropCommitsCommitProp
Al Viro9793.27%450.00%


Randy Dunlap43.85%112.50%


Greg Kroah-Hartman10.96%112.50%


Christoph Hellwig10.96%112.50%


Martin K. Petersen10.96%112.50%


Total104100.00%8100.00%






static void __exit pd_exit(void)
{
	struct pd_unit *disk;
	int unit;
	unregister_blkdev(major, name);
	for (unit = 0, disk = pd; unit < PD_UNITS; unit++, disk++) {
		struct gendisk *p = disk->gd;
		if (p) {
			disk->gd = NULL;
			del_gendisk(p);
			put_disk(p);
			pi_release(disk->pi);
		}
	}
	blk_cleanup_queue(pd_queue);
}


Contributors
PersonTokensPropCommitsCommitProp
Al Viro8797.75%675.00%


Christoph Hellwig11.12%112.50%


Greg Kroah-Hartman11.12%112.50%


Total89100.00%8100.00%



MODULE_LICENSE("GPL");
module_init(pd_init)
module_exit(pd_exit)

Overall Contributors
PersonTokensPropCommitsCommitProp
Al Viro282363.40%2536.23%


Linus Torvalds (pre-git)126628.43%710.14%


Christoph Hellwig1022.29%34.35%


Arnd Bergmann481.08%45.80%


Tejun Heo451.01%68.70%


Andrew Morton430.97%11.45%


Sudip Mukherjee380.85%11.45%


FUJITA Tomonori180.40%11.45%


Joe Lawrence130.29%22.90%


Jens Axboe120.27%34.35%


David Howells100.22%11.45%


Linus Torvalds90.20%45.80%


Adrian Bunk90.20%34.35%


Thomas Gleixner40.09%11.45%


Randy Dunlap40.09%11.45%


Rusty Russell30.07%11.45%


Greg Kroah-Hartman20.04%11.45%


Martin K. Petersen10.02%11.45%


Mel Gorman10.02%11.45%


Alexey Dobriyan10.02%11.45%


Masahiro Yamada10.02%11.45%


Total4453100.00%69100.00%


Directory: drivers/block/paride



Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.