commit 1548bf316f18090576f611c7318447c512ddbdd2
author Alexandre Bounine <alexandre.bounine@idt.com> Wed Oct 27 15:34:36 2010 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> Wed Oct 27 18:03:16 2010 -0700
tree 0a33f527a5fc5c2b3c7cacba7b352f7b9e1d0d37
parent 2d4da0fc0940625d59f014c3f85370f9b60ba7f4

rapidio: fix destructive port EM initialization for Tsi568

Replace possibly damaging broadcast writes into the per-port SP_MODE
registers with individual writes for each port.  This will preserve
individual port configurations in case if ports are configured
differently.

Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com>
Cc: Kumar Gala <galak@kernel.crashing.org>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Li Yang <leoli@freescale.com>
Cc: Thomas Moll <thomas.moll@sysgo.com>
Cc: Micha Nelissen <micha@neli.hopto.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/rapidio/switches/tsi568.c

diff --git a/drivers/rapidio/switches/tsi568.c b/drivers/rapidio/switches/tsi568.c
index f7fd789..b9a389b 100644
--- a/drivers/rapidio/switches/tsi568.c
+++ b/drivers/rapidio/switches/tsi568.c
@@ -29,7 +29,7 @@
 #define SPP_ROUTE_CFG_DESTID(n)	(0x11070 + 0x100*n)
 #define SPP_ROUTE_CFG_PORT(n)	(0x11074 + 0x100*n)
 
-#define TSI568_SP_MODE_BC	0x10004
+#define TSI568_SP_MODE(n)	(0x11004 + 0x100*n)
 #define  TSI568_SP_MODE_PW_DIS	0x08000000
 
 static int
@@ -117,14 +117,19 @@
 	u16 destid = rdev->rswitch->destid;
 	u8 hopcount = rdev->rswitch->hopcount;
 	u32 regval;
+	int portnum;
 
 	pr_debug("TSI568 %s [%d:%d]\n", __func__, destid, hopcount);
 
 	/* Make sure that Port-Writes are disabled (for all ports) */
-	rio_mport_read_config_32(mport, destid, hopcount,
-			TSI568_SP_MODE_BC, &regval);
-	rio_mport_write_config_32(mport, destid, hopcount,
-			TSI568_SP_MODE_BC, regval | TSI568_SP_MODE_PW_DIS);
+	for (portnum = 0;
+	     portnum < RIO_GET_TOTAL_PORTS(rdev->swpinfo); portnum++) {
+		rio_mport_read_config_32(mport, destid, hopcount,
+				TSI568_SP_MODE(portnum), &regval);
+		rio_mport_write_config_32(mport, destid, hopcount,
+				TSI568_SP_MODE(portnum),
+				regval | TSI568_SP_MODE_PW_DIS);
+	}
 
 	return 0;
 }