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/* 
        paride.c  (c) 1997-8  Grant R. Guenther <grant@torque.net>
                              Under the terms of the GNU public license.
 
	This is the base module for the family of device drivers
        that support parallel port IDE devices.  
 
*/
 
/* Changes:
 
	1.01	GRG 1998.05.03	Use spinlocks
	1.02	GRG 1998.05.05  init_proto, release_proto, ktti
	1.03    GRG 1998.08.15  eliminate compiler warning
	1.04    GRG 1998.11.28  added support for FRIQ
 
*/
 
#define PI_VERSION      "1.04"
 
#include <linux/module.h>
#include <linux/config.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/string.h>
#include "spinlock.h"
 
#ifdef CONFIG_PARPORT_MODULE
#define CONFIG_PARPORT
#endif
 
#ifdef CONFIG_PARPORT
#include <linux/parport.h>
#endif
 
#include "paride.h"
 
#define MAX_PROTOS	32
 
static struct pi_protocol	*protocols[MAX_PROTOS];
 
/* spinlock_t	pi_spinlock = SPIN_LOCK_UNLOCKED; */
 
void pi_write_regr( PIA *pi, int cont, int regr, int val)
 
{	pi->proto->write_regr(pi,cont,regr,val);
}
 
int pi_read_regr( PIA *pi, int cont, int regr)
 
{	return pi->proto->read_regr(pi,cont,regr);
}
 
void pi_write_block( PIA *pi, char * buf, int count)
 
{	pi->proto->write_block(pi,buf,count);
}
 
void pi_read_block( PIA *pi, char * buf, int count)
 
{       pi->proto->read_block(pi,buf,count);
}
 
#ifdef CONFIG_PARPORT
 
static void pi_wake_up( void *p)
 
{       PIA  *pi = (PIA *) p;
	long flags;
	void (*cont)(void) = NULL;
 
	spin_lock_irqsave(&pi_spinlock,flags);
 
	if (pi->claim_cont && !parport_claim(pi->pardev)) {
		cont = pi->claim_cont;
		pi->claim_cont = NULL;
		pi->claimed = 1;
	}
 
	spin_unlock_irqrestore(&pi_spinlock,flags);	
 
	wake_up(&(pi->parq));
 
	if (cont) cont();
}
 
#endif
 
void pi_do_claimed( PIA *pi, void(*cont)(void))
 
#ifdef CONFIG_PARPORT
 
{	long flags;
 
	spin_lock_irqsave(&pi_spinlock,flags); 
 
	if (!pi->pardev || !parport_claim(pi->pardev)) {
		pi->claimed = 1;
		spin_unlock_irqrestore(&pi_spinlock,flags);
		cont();
	} else {
		pi->claim_cont = cont;
		spin_unlock_irqrestore(&pi_spinlock,flags);	
	}
}
 
#else
 
{	cont();
}
 
#endif
 
static void pi_claim( PIA *pi)
 
{	if (pi->claimed) return;
	pi->claimed = 1;
#ifdef CONFIG_PARPORT
        if (pi->pardev)
          while (parport_claim((struct pardevice *)(pi->pardev)))
            sleep_on(&(pi->parq));
#endif
}
 
static void pi_unclaim( PIA *pi)
 
{	pi->claimed = 0;
#ifdef CONFIG_PARPORT
        if (pi->pardev) parport_release((struct pardevice *)(pi->pardev));
#endif 
}
 
void pi_connect( PIA *pi)
 
{	pi_claim(pi);
	pi->proto->connect(pi);
}
 
void pi_disconnect( PIA *pi)
 
{	pi->proto->disconnect(pi);
	pi_unclaim(pi);
}
 
static void pi_unregister_parport( PIA *pi)
 
{
#ifdef CONFIG_PARPORT
        if (pi->pardev) {
           parport_unregister_device((struct pardevice *)(pi->pardev));
	   pi->pardev = NULL;
	}
#endif
}
 
void pi_release( PIA *pi)
 
{	pi_unregister_parport(pi);
	if ((!pi->pardev)&&(pi->reserved)) 
		release_region(pi->port,pi->reserved);
	pi->proto->release_proto(pi);
}
 
#define WR(r,v)         pi_write_regr(pi,0,r,v)
#define RR(r)           (pi_read_regr(pi,0,r))
 
static int pi_test_proto( PIA *pi, char * scratch, int verbose )
 
{       int     j, k;
        int     e[2] = {0,0};
 
	if (pi->proto->test_proto) {
		pi_claim(pi);
		j = pi->proto->test_proto(pi,scratch,verbose);
		pi_unclaim(pi);
		return j;
	}
 
        pi_connect(pi);
 
        for (j=0;j<2;j++) {
                WR(6,0xa0+j*0x10);
                for (k=0;k<256;k++) {
                        WR(2,k^0xaa);
                        WR(3,k^0x55);
                        if (RR(2) != (k^0xaa)) e[j]++;
                        }
                }
 
        pi_disconnect(pi);
 
        if (verbose)
                printk("%s: %s: port 0x%x, mode  %d, test=(%d,%d)\n",
                        pi->device,pi->proto->name,pi->port,
			pi->mode,e[0],e[1]);
 
        return (e[0] && e[1]);  /* not here if both > 0 */
}
 
int  pi_register( PIP *pr)
 
{	int k;
 
	for (k=0;k<MAX_PROTOS;k++) 
	   if (protocols[k] && !strcmp(pr->name,protocols[k]->name)) {
		printk("paride: %s protocol already registered\n",pr->name);
		return 0;
	   }
	k = 0;
	while((k<MAX_PROTOS) && (protocols[k])) k++;
	if (k == MAX_PROTOS) {
		printk("paride: protocol table full\n");
		return 0;
	}
	MOD_INC_USE_COUNT;
	protocols[k] = pr;
	pr->index = k;
	printk("paride: %s registered as protocol %d\n",pr->name,k);
	return 1;
}	
 
void pi_unregister( PIP *pr)
 
{	if (!pr) return;
	if (protocols[pr->index] != pr) {
		printk("paride: %s not registered\n",pr->name);
		return;
	} 
	protocols[pr->index] = 0;
	MOD_DEC_USE_COUNT;
}
 
static void pi_register_parport( PIA *pi, int verbose)
 
{
#ifdef CONFIG_PARPORT
 
	struct parport	*pp;
 
	pp = parport_enumerate();
 
	while((pp)&&(pp->base != pi->port)) pp = pp->next;
 
	if (!pp) return;
 
	pi->pardev = (void *) parport_register_device(
	      pp,pi->device,NULL,pi_wake_up,NULL,0,(void *)pi);
 
	pi->parq = NULL;
 
	if (verbose) printk("%s: 0x%x is %s\n",pi->device,pi->port,pp->name);
 
	pi->parname = pp->name;
 
#endif
}
 
static int pi_probe_mode( PIA *pi, int max, char * scratch, int verbose)
 
{	int	best, range;
 
	if (pi->mode != -1) {
		if (pi->mode >= max) return 0;
		range = 3;
		if (pi->mode >= pi->proto->epp_first) range = 8;
		if ((range == 8) && (pi->port % 8)) return 0;
		if ((!pi->pardev) && check_region(pi->port,range)) return 0;
		pi->reserved = range;
		return (!pi_test_proto(pi,scratch,verbose));
	}
	best = -1;
	for(pi->mode=0;pi->mode<max;pi->mode++) {
		range = 3;
		if (pi->mode >= pi->proto->epp_first) range = 8;
		if ((range == 8) && (pi->port % 8)) break;
		if ((!pi->pardev) && check_region(pi->port,range)) break;
		pi->reserved = range;
		if (!pi_test_proto(pi,scratch,verbose)) best = pi->mode;
	}
	pi->mode = best;
	return (best > -1);
}
 
static int pi_probe_unit( PIA *pi, int unit, char * scratch, int verbose)
 
{	int max,s,e;
 
	s = unit; e = s+1;
 
	if (s == -1) { 
		s = 0; 
		e = pi->proto->max_units; 
	}
 
	pi_register_parport(pi,verbose);
 
	if ((!pi->pardev) && check_region(pi->port,3)) return 0;
 
	if (pi->proto->test_port) {
		pi_claim(pi);
		max = pi->proto->test_port(pi);
		pi_unclaim(pi);
	}
	else max = pi->proto->max_mode;
 
	if (pi->proto->probe_unit) {
	   pi_claim(pi);
	   for (pi->unit=s;pi->unit<e;pi->unit++)
	      if (pi->proto->probe_unit(pi)) {
		 pi_unclaim(pi);
		 if (pi_probe_mode(pi,max,scratch,verbose)) return 1;
	         pi_unregister_parport(pi); 
		 return 0;
	         }
	   pi_unclaim(pi);
	   pi_unregister_parport(pi); 
	   return 0;
	   }
 
	if (!pi_probe_mode(pi,max,scratch,verbose)) {
	   pi_unregister_parport(pi); 
	   return 0;
	}
	return 1;
 
}
 
int pi_init(PIA *pi, int autoprobe, int port, int mode, 
	    int unit, int protocol, int delay, char * scratch, 
	    int devtype, int verbose, char *device )
 
{	int p,k,s,e;
	int lpts[7] = {0x3bc,0x378,0x278,0x268,0x27c,0x26c,0};
 
	s = protocol; e = s+1;
 
	if (autoprobe) {
		s = 0; 
		e = MAX_PROTOS;
	} else if ((s < 0) || (s >= MAX_PROTOS) || (port <= 0) ||
		    (!protocols[s]) || (unit < 0) || 
		    (unit >= protocols[s]->max_units)) {
			printk("%s: Invalid parameters\n",device);
			return 0;
		        }
 
	for (p=s;p<e;p++) {
	  if (protocols[p]) {
		pi->proto = protocols[p];
		pi->private = 0;
		pi->proto->init_proto(pi);
		if (delay == -1) pi->delay = pi->proto->default_delay;
		  else pi->delay = delay;
		pi->devtype = devtype;
		pi->device = device;
 
		pi->parname = NULL;
		pi->pardev = NULL;
		pi->parq = NULL;
		pi->claimed = 0;
		pi->claim_cont = NULL;
 
		pi->mode = mode;
		if (port != -1) {
			pi->port = port;
			if (pi_probe_unit(pi,unit,scratch,verbose)) break;
			pi->port = 0;
		} else { 
			k = 0;
			while ((pi->port = lpts[k++]))
			   if (pi_probe_unit(pi,unit,scratch,verbose)) break;
      			if (pi->port) break;
		}
		pi->proto->release_proto(pi);
	  }
	}
 
	if (!pi->port) {
		if (autoprobe) printk("%s: Autoprobe failed\n",device);
		else printk("%s: Adapter not found\n",device);
		return 0;
	}
 
	if (!pi->pardev)
	   request_region(pi->port,pi->reserved,pi->device);
 
	if (pi->parname)
	   printk("%s: Sharing %s at 0x%x\n",pi->device,
			pi->parname,pi->port);
 
	pi->proto->log_adapter(pi,scratch,verbose);
 
	return 1;
}
 
#ifdef MODULE
 
int	init_module(void)
 
{	int k;
 
	for (k=0;k<MAX_PROTOS;k++) protocols[k] = 0;
	printk("paride: version %s installed\n",PI_VERSION);
	return 0;
}
 
void	cleanup_module(void)
 
{
}
 
#else
 
void	paride_init( void )
 
{
 
#ifdef CONFIG_PARIDE_ATEN
	{ extern struct pi_protocol aten;
	  pi_register(&aten);
	};
#endif
#ifdef CONFIG_PARIDE_BPCK
        { extern struct pi_protocol bpck;
          pi_register(&bpck);
        };
#endif
#ifdef CONFIG_PARIDE_COMM
        { extern struct pi_protocol comm;
          pi_register(&comm);
        };
#endif
#ifdef CONFIG_PARIDE_DSTR
        { extern struct pi_protocol dstr;
          pi_register(&dstr);
        };
#endif
#ifdef CONFIG_PARIDE_EPAT
        { extern struct pi_protocol epat;
          pi_register(&epat);
        };
#endif
#ifdef CONFIG_PARIDE_EPIA
        { extern struct pi_protocol epia;
          pi_register(&epia);
        };
#endif
#ifdef CONFIG_PARIDE_FRPW
        { extern struct pi_protocol frpw;
          pi_register(&frpw);
        };
#endif
#ifdef CONFIG_PARIDE_FRIQ
        { extern struct pi_protocol friq;
          pi_register(&friq);
        };
#endif 
#ifdef CONFIG_PARIDE_FIT2
        { extern struct pi_protocol fit2;
          pi_register(&fit2);
        };
#endif
#ifdef CONFIG_PARIDE_FIT3
        { extern struct pi_protocol fit3;
          pi_register(&fit3);
        };
#endif
#ifdef CONFIG_PARIDE_KBIC
        { extern struct pi_protocol k951;
          extern struct pi_protocol k971;
          pi_register(&k951);
          pi_register(&k971);
        };
#endif
#ifdef CONFIG_PARIDE_KTTI
        { extern struct pi_protocol ktti;
          pi_register(&ktti);
        };
#endif
#ifdef CONFIG_PARIDE_ON20
        { extern struct pi_protocol on20;
          pi_register(&on20);
        };
#endif
#ifdef CONFIG_PARIDE_ON26
        { extern struct pi_protocol on26;
          pi_register(&on26);
        };
#endif
 
#ifdef CONFIG_PARIDE_PD
	{ extern int pd_init(void);
	  pd_init();
	};
#endif
#ifdef CONFIG_PARIDE_PCD
        { extern int pcd_init(void);
          pcd_init();
        };
#endif
#ifdef CONFIG_PARIDE_PF
        { extern int pf_init(void);
          pf_init();
        };
#endif
#ifdef CONFIG_PARIDE_PT
        { extern int pt_init(void);
          pt_init();
        };
#endif
#ifdef CONFIG_PARIDE_PG
        { extern int pg_init(void);
          pg_init();
        };
#endif
}
 
#endif
 
/* end of paride.c */