ieee1394: extend lowlevel API for address range properties

Host adapter hardware imposes certain restrictions and features on
address ranges.  Instead of hard-wire such ranges into the ieee1394
core or even into protocol drivers, let lowlevel drivers specify
these ranges via struct hpsb_host.

Patch "ohci1394: set address range properties" must be applied too,
else hpsb_allocate_and_register_addrspace() won't work properly.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Ben Collins <bcollins@ubuntu.com>

drivers/ieee1394/highlevel.c

@@ -312,8 +312,10 @@ u64 hpsb_allocate_and_register_addrspace(struct hpsb_highlevel *hl,
 		return retval;
 	}
 
+	/* default range,
+	 * avoids controller's posted write area (see OHCI 1.1 clause 1.5) */
 	if (start == ~0ULL && end == ~0ULL) {
-		start = CSR1212_ALL_SPACE_BASE + 0xffff00000000ULL;  /* ohci1394.c limit */
+		start = host->middle_addr_space;
 		end = CSR1212_ALL_SPACE_END;
 	}
 

drivers/ieee1394/hosts.h

@@ -73,6 +73,8 @@ struct hpsb_host {
 	unsigned int config_roms;
 
 	struct list_head addr_space;
+	u64 low_addr_space;	/* upper bound of physical DMA area */
+	u64 middle_addr_space;	/* upper bound of posted write area */
 };