tg3: Refactor the 2nd type of cpu pause

For completeness and consistency, add common function
tg3_pause_cpu_and_set_pc(). This is only for existing fw and not used for the
57766.
Reviewed-by: Benjamin Li <benli@broadcom.com>
Signed-off-by: Nithin Nayak Sujir <nsujir@broadcom.com>
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/tg3.c

@@ -3588,12 +3588,33 @@ static int tg3_load_firmware_cpu(struct tg3 *tp, u32 cpu_base,
 	return err;
 }
 
+/* tp->lock is held. */
+static int tg3_pause_cpu_and_set_pc(struct tg3 *tp, u32 cpu_base, u32 pc)
+{
+	int i;
+	const int iters = 5;
+
+	tw32(cpu_base + CPU_STATE, 0xffffffff);
+	tw32_f(cpu_base + CPU_PC, pc);
+
+	for (i = 0; i < iters; i++) {
+		if (tr32(cpu_base + CPU_PC) == pc)
+			break;
+		tw32(cpu_base + CPU_STATE, 0xffffffff);
+		tw32(cpu_base + CPU_MODE,  CPU_MODE_HALT);
+		tw32_f(cpu_base + CPU_PC, pc);
+		udelay(1000);
+	}
+
+	return (i == iters) ? -EBUSY : 0;
+}
+
 /* tp->lock is held. */
 static int tg3_load_5701_a0_firmware_fix(struct tg3 *tp)
 {
 	struct fw_info info;
 	const __be32 *fw_data;
-	int err, i;
+	int err;
 
 	fw_data = (void *)tp->fw->data;
 
@@ -3620,18 +3641,8 @@ static int tg3_load_5701_a0_firmware_fix(struct tg3 *tp)
 		return err;
 
 	/* Now startup only the RX cpu. */
-	tw32(RX_CPU_BASE + CPU_STATE, 0xffffffff);
-	tw32_f(RX_CPU_BASE + CPU_PC, info.fw_base);
-
-	for (i = 0; i < 5; i++) {
-		if (tr32(RX_CPU_BASE + CPU_PC) == info.fw_base)
-			break;
-		tw32(RX_CPU_BASE + CPU_STATE, 0xffffffff);
-		tw32(RX_CPU_BASE + CPU_MODE,  CPU_MODE_HALT);
-		tw32_f(RX_CPU_BASE + CPU_PC, info.fw_base);
-		udelay(1000);
-	}
-	if (i >= 5) {
+	err = tg3_pause_cpu_and_set_pc(tp, RX_CPU_BASE, info.fw_base);
+	if (err) {
 		netdev_err(tp->dev, "%s fails to set RX CPU PC, is %08x "
 			   "should be %08x\n", __func__,
 			   tr32(RX_CPU_BASE + CPU_PC), info.fw_base);
@@ -3649,7 +3660,7 @@ static int tg3_load_tso_firmware(struct tg3 *tp)
 	struct fw_info info;
 	const __be32 *fw_data;
 	unsigned long cpu_base, cpu_scratch_base, cpu_scratch_size;
-	int err, i;
+	int err;
 
 	if (!tg3_flag(tp, FW_TSO))
 		return 0;
@@ -3683,18 +3694,8 @@ static int tg3_load_tso_firmware(struct tg3 *tp)
 		return err;
 
 	/* Now startup the cpu. */
-	tw32(cpu_base + CPU_STATE, 0xffffffff);
-	tw32_f(cpu_base + CPU_PC, info.fw_base);
-
-	for (i = 0; i < 5; i++) {
-		if (tr32(cpu_base + CPU_PC) == info.fw_base)
-			break;
-		tw32(cpu_base + CPU_STATE, 0xffffffff);
-		tw32(cpu_base + CPU_MODE,  CPU_MODE_HALT);
-		tw32_f(cpu_base + CPU_PC, info.fw_base);
-		udelay(1000);
-	}
-	if (i >= 5) {
+	err = tg3_pause_cpu_and_set_pc(tp, cpu_base, info.fw_base);
+	if (err) {
 		netdev_err(tp->dev,
 			   "%s fails to set CPU PC, is %08x should be %08x\n",
 			   __func__, tr32(cpu_base + CPU_PC), info.fw_base);