sbp2: variable status FIFO address (fix login timeout)

Let the ieee1394 core select a suitable 1394 address range for sbp2's
status FIFO instead of using a fixed range. Since the core only selects
addresses which are guaranteed to be out of the "physical range" as per
OHCI 1.1, this patch also fixes an old bug:

OHCI controllers which implement a writeable PhysicalUpperBound register
included sbp2's status FIFO in the physical range. That way sbp2 was
never notified of a succesful login and always failed after timeout.
Affected OHCI host adapters include ALi and Fujitsu controllers.

As another side effect of this patch, the status FIFO is no longer
located in a range for which OHCI chips perform "posted writes". Each
status write now requires a response subaction. But since large data
transfers involve only few status writes, there is no measurable
decrease of I/O throughput. What's more, the status FIFO is now safe
from potential host bus errors. Nevertheless, posted writes could be
re-enabled by extensions to the ARM features of the 1394 stack.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Jody McIntyre <scjody@modernduck.com>
(cherry picked from b2d38cccad4ef80d6b672b8f89aae5fe2907b113 commit)

1 files changed, 23 insertions, 41 deletions

diff --git a/drivers/ieee1394/sbp2.h b/drivers/ieee1394/sbp2.h
index 900ea1d25e71..e2d357a9ea3a 100644
--- a/drivers/ieee1394/sbp2.h
+++ b/drivers/ieee1394/sbp2.h
@@ -33,15 +33,17 @@
 #define ORB_DIRECTION_NO_DATA_TRANSFER  0x2
 
 #define ORB_SET_NULL_PTR(value)			((value & 0x1) << 31)
-#define ORB_SET_NOTIFY(value)                   ((value & 0x1) << 31)
-#define ORB_SET_RQ_FMT(value)                   ((value & 0x3) << 29)	/* unused ? */
+#define ORB_SET_NOTIFY(value)			((value & 0x1) << 31)
+#define ORB_SET_RQ_FMT(value)			((value & 0x3) << 29)	/* unused ? */
 #define ORB_SET_NODE_ID(value)			((value & 0xffff) << 16)
-#define ORB_SET_DATA_SIZE(value)                (value & 0xffff)
-#define ORB_SET_PAGE_SIZE(value)                ((value & 0x7) << 16)
-#define ORB_SET_PAGE_TABLE_PRESENT(value)       ((value & 0x1) << 19)
-#define ORB_SET_MAX_PAYLOAD(value)              ((value & 0xf) << 20)
-#define ORB_SET_SPEED(value)                    ((value & 0x7) << 24)
-#define ORB_SET_DIRECTION(value)                ((value & 0x1) << 27)
+#define ORB_SET_STATUS_FIFO_HI(value, id)	(value >> 32 | ORB_SET_NODE_ID(id))
+#define ORB_SET_STATUS_FIFO_LO(value)		(value & 0xffffffff)
+#define ORB_SET_DATA_SIZE(value)		(value & 0xffff)
+#define ORB_SET_PAGE_SIZE(value)		((value & 0x7) << 16)
+#define ORB_SET_PAGE_TABLE_PRESENT(value)	((value & 0x1) << 19)
+#define ORB_SET_MAX_PAYLOAD(value)		((value & 0xf) << 20)
+#define ORB_SET_SPEED(value)			((value & 0x7) << 24)
+#define ORB_SET_DIRECTION(value)		((value & 0x1) << 27)
 
 struct sbp2_command_orb {
 	volatile u32 next_ORB_hi;
@@ -76,8 +78,8 @@ struct sbp2_login_orb {
 	u32 login_response_lo;
 	u32 lun_misc;
 	u32 passwd_resp_lengths;
-	u32 status_FIFO_hi;
-	u32 status_FIFO_lo;
+	u32 status_fifo_hi;
+	u32 status_fifo_lo;
 };
 
 #define RESPONSE_GET_LOGIN_ID(value)            (value & 0xffff)
@@ -102,8 +104,8 @@ struct sbp2_query_logins_orb {
 	u32 query_response_lo;
 	u32 lun_misc;
 	u32 reserved_resp_length;
-	u32 status_FIFO_hi;
-	u32 status_FIFO_lo;
+	u32 status_fifo_hi;
+	u32 status_fifo_lo;
 };
 
 #define RESPONSE_GET_MAX_LOGINS(value)          (value & 0xffff)
@@ -123,8 +125,8 @@ struct sbp2_reconnect_orb {
 	u32 reserved4;
 	u32 login_ID_misc;
 	u32 reserved5;
-	u32 status_FIFO_hi;
-	u32 status_FIFO_lo;
+	u32 status_fifo_hi;
+	u32 status_fifo_lo;
 };
 
 struct sbp2_logout_orb {
@@ -134,8 +136,8 @@ struct sbp2_logout_orb {
 	u32 reserved4;
 	u32 login_ID_misc;
 	u32 reserved5;
-	u32 status_FIFO_hi;
-	u32 status_FIFO_lo;
+	u32 status_fifo_hi;
+	u32 status_fifo_lo;
 };
 
 #define PAGE_TABLE_SET_SEGMENT_BASE_HI(value)   (value & 0xffff)
@@ -195,30 +197,6 @@ struct sbp2_status_block {
  * Miscellaneous SBP2 related config rom defines
  */
 
-/* The status fifo address definition below is used as a base for each
- * node, which a chunk seperately assigned to each unit directory in the
- * node.  For example, 0xfffe00000000ULL is used for the first sbp2 device
- * detected on node 0, 0xfffe00000020ULL for the next sbp2 device on node
- * 0, and so on.
- *
- * Note: We could use a single status fifo address for all sbp2 devices,
- * and figure out which sbp2 device the status belongs to by looking at
- * the source node id of the status write... but, using separate addresses
- * for each sbp2 unit directory allows for better code and the ability to
- * support multiple luns within a single 1394 node.
- *
- * Also note that we choose the address range below as it is a region
- * specified for write posting, where the ohci controller will
- * automatically send an ack_complete when the status is written by the
- * sbp2 device... saving a split transaction.   =)
- */
-#define SBP2_STATUS_FIFO_ADDRESS				0xfffe00000000ULL
-#define SBP2_STATUS_FIFO_ADDRESS_HI                             0xfffe
-#define SBP2_STATUS_FIFO_ADDRESS_LO                             0x0
-
-#define SBP2_STATUS_FIFO_ENTRY_TO_OFFSET(entry)			((entry) << 5)
-#define SBP2_STATUS_FIFO_OFFSET_TO_ENTRY(offset)		((offset) >> 5)
-
 #define SBP2_UNIT_DIRECTORY_OFFSET_KEY				0xd1
 #define SBP2_CSR_OFFSET_KEY					0x54
 #define SBP2_UNIT_SPEC_ID_KEY					0x12
@@ -258,7 +236,6 @@ struct sbp2_status_block {
  */
 
 #define SBP2_MAX_SG_ELEMENT_LENGTH	0xf000
-#define SBP2_MAX_UDS_PER_NODE		16	/* Maximum scsi devices per node */
 #define SBP2_MAX_SECTORS		255	/* Max sectors supported */
 #define SBP2_MAX_CMDS			8	/* This should be safe */
 
@@ -338,6 +315,11 @@ struct scsi_id_instance_data {
 	u32 sbp2_firmware_revision;
 
 	/*
+	 * Address for the device to write status blocks to
+	 */
+	u64 status_fifo_addr;
+
+	/*
 	 * Variable used for logins, reconnects, logouts, query logins
 	 */
 	atomic_t sbp2_login_complete;