Import of Linus's Linux 1.1.68

1 files changed, 329 insertions, 0 deletions

diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c
new file mode 100644
index 000000000..9488c1f19
--- /dev/null
+++ b/drivers/scsi/hosts.c
@@ -0,0 +1,329 @@
+/*
+ *	hosts.c Copyright (C) 1992 Drew Eckhardt 
+ *	mid to lowlevel SCSI driver interface by
+ *		Drew Eckhardt 
+ *
+ *	<drew@colorado.edu>
+ */
+
+
+/*
+ *	This file contains the medium level SCSI
+ *	host interface initialization, as well as the scsi_hosts array of SCSI
+ *	hosts currently present in the system. 
+ */
+
+#include <linux/config.h>
+#include "../block/blk.h"
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include "scsi.h"
+
+#ifndef NULL 
+#define NULL 0L
+#endif
+
+#define HOSTS_C
+
+#include "hosts.h"
+
+#ifdef CONFIG_SCSI_AHA152X
+#include "aha152x.h"
+#endif
+
+#ifdef CONFIG_SCSI_AHA1542
+#include "aha1542.h"
+#endif
+
+#ifdef CONFIG_SCSI_AHA1740
+#include "aha1740.h"
+#endif
+
+#ifdef CONFIG_SCSI_AHA274X
+#include "aha274x.h"
+#endif
+
+#ifdef CONFIG_SCSI_BUSLOGIC
+#include "buslogic.h"
+#endif
+
+#ifdef CONFIG_SCSI_U14_34F
+#include "u14-34f.h"
+#endif
+ 
+#ifdef CONFIG_SCSI_FUTURE_DOMAIN
+#include "fdomain.h"
+#endif
+
+#ifdef CONFIG_SCSI_GENERIC_NCR5380
+#include "g_NCR5380.h"
+#endif
+
+#ifdef CONFIG_SCSI_IN2000
+#include "in2000.h"
+#endif
+
+#ifdef CONFIG_SCSI_PAS16
+#include "pas16.h"
+#endif
+
+#ifdef CONFIG_SCSI_QLOGIC
+#include "qlogic.h"
+#endif
+
+#ifdef CONFIG_SCSI_SEAGATE
+#include "seagate.h"
+#endif
+
+#ifdef CONFIG_SCSI_T128
+#include "t128.h"
+#endif
+
+#ifdef CONFIG_SCSI_NCR53C7xx
+#include "53c7,8xx.h"
+#endif
+
+#ifdef CONFIG_SCSI_ULTRASTOR
+#include "ultrastor.h"
+#endif
+
+#ifdef CONFIG_SCSI_7000FASST
+#include "wd7000.h"
+#endif
+
+#ifdef CONFIG_SCSI_EATA
+#include "eata.h"
+#endif
+ 
+#ifdef CONFIG_SCSI_DEBUG
+#include "scsi_debug.h"
+#endif
+
+/*
+static const char RCSid[] = "$Header: /usr/src/linux/kernel/blk_drv/scsi/RCS/hosts.c,v 1.3 1993/09/24 12:21:00 drew Exp drew $";
+*/
+
+/*
+ *	The scsi host entries should be in the order you wish the 
+ *	cards to be detected.  A driver may appear more than once IFF
+ *	it can deal with being detected (and therefore initialized) 
+ *	with more than one simultaneous host number, can handle being
+ *	reentrant, etc.
+ *
+ *	They may appear in any order, as each SCSI host  is told which host number it is
+ *	during detection.
+ */
+
+/* This is a placeholder for controllers that are not configured into
+   the system - we do this to ensure that the controller numbering is
+   always consistent, no matter how the kernel is configured. */
+
+#define NO_CONTROLLER {NULL, NULL, NULL, NULL, NULL, NULL, NULL, \
+	        NULL, NULL, 0, 0, 0, 0, 0, 0}
+
+/*
+ *	When figure is run, we don't want to link to any object code.  Since 
+ *	the macro for each host will contain function pointers, we cannot 
+ *	use it and instead must use a "blank" that does no such 
+ *	idiocy.
+ */
+
+Scsi_Host_Template * scsi_hosts = NULL;
+
+static Scsi_Host_Template builtin_scsi_hosts[] =
+	{
+#ifdef CONFIG_SCSI_U14_34F
+	ULTRASTOR_14_34F,
+#endif
+#ifdef CONFIG_SCSI_ULTRASTOR
+	ULTRASTOR_14F,
+#endif
+#ifdef CONFIG_SCSI_AHA152X
+	AHA152X,
+#endif
+/* Buslogic must come before aha1542.c */
+#ifdef CONFIG_SCSI_BUSLOGIC
+	BUSLOGIC,
+#endif
+#ifdef CONFIG_SCSI_AHA1542
+	AHA1542,
+#endif
+#ifdef CONFIG_SCSI_AHA1740
+	AHA1740,
+#endif
+#ifdef CONFIG_SCSI_AHA274X
+	AHA274X,
+#endif
+#ifdef CONFIG_SCSI_FUTURE_DOMAIN
+	FDOMAIN_16X0,
+#endif
+#ifdef CONFIG_SCSI_IN2000
+	IN2000,
+#endif
+#ifdef CONFIG_SCSI_GENERIC_NCR5380
+        GENERIC_NCR5380,
+#endif
+#ifdef CONFIG_SCSI_QLOGIC
+	QLOGIC,
+#endif
+#ifdef CONFIG_SCSI_PAS16
+	MV_PAS16,
+#endif
+#ifdef CONFIG_SCSI_SEAGATE
+	SEAGATE_ST0X,
+#endif
+#ifdef CONFIG_SCSI_T128
+        TRANTOR_T128,
+#endif
+#ifdef CONFIG_SCSI_NCR53C7xx
+	NCR53c7xx,
+#endif
+#ifdef CONFIG_SCSI_7000FASST
+	WD7000,
+#endif
+#ifdef CONFIG_SCSI_EATA
+	EATA,
+#endif
+#ifdef CONFIG_SCSI_DEBUG
+	SCSI_DEBUG,
+#endif
+	};
+
+#define MAX_SCSI_HOSTS (sizeof(builtin_scsi_hosts) / sizeof(Scsi_Host_Template))
+
+/*
+ *	Our semaphores and timeout counters, where size depends on MAX_SCSI_HOSTS here. 
+ */
+
+struct Scsi_Host * scsi_hostlist = NULL;
+struct Scsi_Device_Template * scsi_devicelist;
+
+int max_scsi_hosts = 0;
+static int next_host = 0;
+
+void
+scsi_unregister(struct Scsi_Host * sh){
+	struct Scsi_Host * shpnt;
+	int j;
+
+	j = sh->extra_bytes;
+
+	if(scsi_hostlist == sh)
+		scsi_hostlist = NULL;
+	else {
+		shpnt = scsi_hostlist;
+		while(shpnt->next != sh) shpnt = shpnt->next;
+		shpnt->next = shpnt->next->next;
+	};
+	next_host--;
+	scsi_init_free((char *) sh, sizeof(struct Scsi_Host) + j);
+}
+
+/* We call this when we come across a new host adapter. We only do this
+   once we are 100% sure that we want to use this host adapter -  it is a
+   pain to reverse this, so we try and avoid it */
+
+struct Scsi_Host * scsi_register(Scsi_Host_Template * tpnt, int j){
+	struct Scsi_Host * retval, *shpnt;
+	retval = (struct Scsi_Host *)scsi_init_malloc(sizeof(struct Scsi_Host) + j);
+	retval->host_busy = 0;
+	retval->block = NULL;
+	if(j > 0xffff) panic("Too many extra bytes requested\n");
+	retval->extra_bytes = j;
+	retval->loaded_as_module = scsi_loadable_module_flag;
+	retval->host_no = next_host++;
+	retval->host_queue = NULL;	
+	retval->host_wait = NULL;	
+	retval->last_reset = 0;	
+	retval->irq = 0;
+	retval->hostt = tpnt;	
+	retval->next = NULL;
+#ifdef DEBUG
+	printk("Register %x %x: %d\n", retval, retval->hostt, j);
+#endif
+
+	/* The next four are the default values which can be overridden
+	   if need be */
+	retval->this_id = tpnt->this_id;
+	retval->can_queue = tpnt->can_queue;
+	retval->sg_tablesize = tpnt->sg_tablesize;
+	retval->unchecked_isa_dma = tpnt->unchecked_isa_dma;
+
+	if(!scsi_hostlist)
+		scsi_hostlist = retval;
+	else
+	{
+		shpnt = scsi_hostlist;
+		while(shpnt->next) shpnt = shpnt->next;
+		shpnt->next = retval;
+	}
+
+	return retval;
+}
+
+int
+scsi_register_device(struct Scsi_Device_Template * sdpnt)
+{
+  if(sdpnt->next) panic("Device already registered");
+  sdpnt->next = scsi_devicelist;
+  scsi_devicelist = sdpnt;
+  return 0;
+}
+
+unsigned int scsi_init()
+{
+	static int called = 0;
+	int i, j, count, pcount;
+	Scsi_Host_Template * tpnt;
+	count = 0;
+
+	if(called) return 0;
+
+	called = 1;	
+	for (tpnt = &builtin_scsi_hosts[0], i = 0; i < MAX_SCSI_HOSTS; ++i, tpnt++)
+	{
+		/*
+		 * Initialize our semaphores.  -1 is interpreted to mean 
+		 * "inactive" - where as 0 will indicate a time out condition.
+		 */ 
+		
+		pcount = next_host;
+		if ((tpnt->detect) && 
+		    (tpnt->present = 
+		     tpnt->detect(tpnt)))
+		{		
+			/* The only time this should come up is when people use
+			   some kind of patched driver of some kind or another. */
+			if(pcount == next_host) {
+				if(tpnt->present > 1)
+					panic("Failure to register low-level scsi driver");
+				/* The low-level driver failed to register a driver.  We
+				   can do this now. */
+				scsi_register(tpnt,0);
+			};
+			tpnt->next = scsi_hosts;
+			scsi_hosts = tpnt;
+			for(j = 0; j < tpnt->present; j++)
+				printk ("scsi%d : %s\n",
+					count++, tpnt->name);
+		}
+	}
+	printk ("scsi : %d hosts.\n", count);
+	
+	/* Now attach the high level drivers */
+#ifdef CONFIG_BLK_DEV_SD
+	scsi_register_device(&sd_template);
+#endif
+#ifdef CONFIG_BLK_DEV_SR
+	scsi_register_device(&sr_template);
+#endif
+#ifdef CONFIG_CHR_DEV_ST
+	scsi_register_device(&st_template);
+#endif
+#ifdef CONFIG_CHR_DEV_SG
+	scsi_register_device(&sg_template);
+#endif
+
+	max_scsi_hosts = count;
+	return 0;
+}