[PATCH] tulip: make tulip_stop_rxtx() wait for DMA to fully stop

From: "John W. Linville" <linville@tuxdriver.com>

tulip_stop_rxtx() doesn't wait for DMA to fully stop like the function
call name implies.

This was submitted through my employer -- I am not the original author of this
patch.  However, I passed it by Jeff Garizk and he expressed interest in
having it upstream.
Signed-off-by: Grant Grundler <iod00d@hp.com>
Acked-by: Charlie Brett <charlie.brett@hp.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

drivers/net/tulip/21142.c

@@ -14,9 +14,9 @@
 
 */
 
-#include "tulip.h"
 #include <linux/pci.h>
 #include <linux/delay.h>
+#include "tulip.h"
 
 
 static u16 t21142_csr13[] = { 0x0001, 0x0009, 0x0009, 0x0000, 0x0001, };

drivers/net/tulip/eeprom.c

@@ -14,6 +14,7 @@
 
 */
 
+#include <linux/pci.h>
 #include "tulip.h"
 #include <linux/init.h>
 #include <asm/unaligned.h>

drivers/net/tulip/interrupt.c

@@ -14,10 +14,10 @@
 
 */
 
+#include <linux/pci.h>
 #include "tulip.h"
 #include <linux/config.h>
 #include <linux/etherdevice.h>
-#include <linux/pci.h>
 
 int tulip_rx_copybreak;
 unsigned int tulip_max_interrupt_work;

drivers/net/tulip/media.c

@@ -18,6 +18,7 @@
 #include <linux/mii.h>
 #include <linux/init.h>
 #include <linux/delay.h>
+#include <linux/pci.h>
 #include "tulip.h"
 
 

drivers/net/tulip/pnic.c

@@ -15,6 +15,7 @@
 */
 
 #include <linux/kernel.h>
+#include <linux/pci.h>
 #include "tulip.h"
 
 

drivers/net/tulip/pnic2.c

@@ -76,8 +76,8 @@
 
 
 
-#include "tulip.h"
 #include <linux/pci.h>
+#include "tulip.h"
 #include <linux/delay.h>
 
 

drivers/net/tulip/timer.c

@@ -14,6 +14,7 @@
 
 */
 
+#include <linux/pci.h>
 #include "tulip.h"
 
 

drivers/net/tulip/tulip.h

@@ -149,6 +149,9 @@ enum status_bits {
 	TxIntr = 0x01,
 };
 
+/* bit mask for CSR5 TX/RX process state */
+#define CSR5_TS	0x00700000
+#define CSR5_RS	0x000e0000
 
 enum tulip_mode_bits {
 	TxThreshold		= (1 << 22),
@@ -460,9 +463,19 @@ static inline void tulip_stop_rxtx(struct tulip_private *tp)
 	u32 csr6 = ioread32(ioaddr + CSR6);
 
 	if (csr6 & RxTx) {
+		unsigned i=1300/10;
 		iowrite32(csr6 & ~RxTx, ioaddr + CSR6);
 		barrier();
-		(void) ioread32(ioaddr + CSR6); /* mmio sync */
+		/* wait until in-flight frame completes.
+		 * Max time @ 10BT: 1500*8b/10Mbps == 1200us (+ 100us margin)
+		 * Typically expect this loop to end in < 50 us on 100BT.
+		 */
+		while (--i && (ioread32(ioaddr + CSR5) & (CSR5_TS|CSR5_RS)))
+			udelay(10);
+
+		if (!i)
+			printk(KERN_DEBUG "%s: tulip_stop_rxtx() failed\n",
+					tp->pdev->slot_name);
 	}
 }
 

drivers/net/tulip/tulip_core.c

@@ -26,8 +26,8 @@
 
 
 #include <linux/module.h>
-#include "tulip.h"
 #include <linux/pci.h>
+#include "tulip.h"
 #include <linux/init.h>
 #include <linux/etherdevice.h>
 #include <linux/delay.h>