[Linux1394-cvslog] rev 715 - trunk

[SVN U. <ano...@li...>]

Author: anonymous
Date: 2002-12-20 02:58:27 -0500 (Fri, 20 Dec 2002)
New Revision: 715

Modified:
   trunk/ohci1394.c
   trunk/ohci1394.h
Log:
first little bit of multichannel ISO receive infrastructure

Modified: trunk/ohci1394.c
==============================================================================
--- trunk/ohci1394.c	(original)
+++ trunk/ohci1394.c	2002-12-22 09:50:36.000000000 -0500
@@ -1780,7 +1780,7 @@
 
 		if (t->type == OHCI_ISO_TRANSMIT && tx_event & mask)
 			tasklet_schedule(&t->tasklet);
-		if (t->type == OHCI_ISO_RECEIVE && rx_event & mask)
+		else if (rx_event & mask)
 			tasklet_schedule(&t->tasklet);
 	}
 
@@ -3025,7 +3025,7 @@
 /* essentially the only purpose of this code is to allow another
    module to hook into ohci's interrupt handler */
 
-void ohci1394_stop_context(struct ti_ohci *ohci, int reg, char *msg)
+int ohci1394_stop_context(struct ti_ohci *ohci, int reg, char *msg)
 {
 	int i=0;
 
@@ -3037,11 +3037,15 @@
 		i++;
 		if (i>5000) {
 			PRINT(KERN_ERR, ohci->id, 
-			      "Runaway loop while stopping context...");
-			break;
+			      "Runaway loop while stopping context: %s...", msg ? msg : "");
+			return 1;
 		}
+
+		mb();
+		udelay(10);
 	}
 	if (msg) PRINT(KERN_ERR, ohci->id, "%s: dma prg stopped", msg);
+	return 0;
 }
 
 void ohci1394_init_iso_tasklet(struct ohci1394_iso_tasklet *tasklet, int type,
@@ -3067,6 +3071,13 @@
 	else {
 		n = ohci->nb_iso_rcv_ctx;
 		usage = &ohci->ir_ctx_usage;
+
+		/* only one receive context can be multichannel (OHCI sec 10.4.1) */
+		if(tasklet->type == OHCI_ISO_MULTICHANNEL_RECEIVE) {
+			if(test_and_set_bit(0, &ohci->ir_multichannel_used)) {
+				return r;
+			}
+		}
 	}
 
 	spin_lock_irqsave(&ohci->iso_tasklet_list_lock, flags);
@@ -3095,9 +3106,14 @@
 
 	if (tasklet->type == OHCI_ISO_TRANSMIT)
 		clear_bit(tasklet->context, &ohci->it_ctx_usage);
-	else
+	else {
 		clear_bit(tasklet->context, &ohci->ir_ctx_usage);
 
+		if(tasklet->type == OHCI_ISO_MULTICHANNEL_RECEIVE) {
+			clear_bit(0, &ohci->ir_multichannel_used);
+		}
+	}
+
 	list_del(&tasklet->link);
 
 	spin_unlock_irqrestore(&ohci->iso_tasklet_list_lock, flags);

Modified: trunk/ohci1394.h
==============================================================================
--- trunk/ohci1394.h	(original)
+++ trunk/ohci1394.h	2002-12-22 09:50:36.000000000 -0500
@@ -145,7 +145,8 @@
 	struct tasklet_struct tasklet;
 	struct list_head link;
 	int context;
-	enum { OHCI_ISO_TRANSMIT, OHCI_ISO_RECEIVE } type;
+	enum { OHCI_ISO_TRANSMIT, OHCI_ISO_RECEIVE,
+	       OHCI_ISO_MULTICHANNEL_RECEIVE } type;
 };
 
 struct ti_ohci {
@@ -192,6 +193,7 @@
         spinlock_t IR_channel_lock;
 	int nb_iso_rcv_ctx;
 	unsigned long ir_ctx_usage; /* use test_and_set_bit() for atomicity */
+	unsigned int ir_multichannel_used; /* ditto */
 	
         /* iso transmit */
 	struct dma_trm_ctx it_context;
@@ -416,8 +418,8 @@
 void ohci1394_unregister_iso_tasklet(struct ti_ohci *ohci,
 				     struct ohci1394_iso_tasklet *tasklet);
 
-void ohci1394_stop_context      (struct ti_ohci *ohci, int reg, char *msg);
+/* returns zero if successful, one if DMA context is locked up */
+int ohci1394_stop_context      (struct ti_ohci *ohci, int reg, char *msg);
 struct ti_ohci *ohci1394_get_struct(int card_num);
 
 #endif
-