mpc83xx: add support configure bus parking

Add support to configure bus parking mode and master in bus arbitration
configuration (ACR). Add this for the kmeter1 port:

Configure bus arbiter with recommended values from Freescale
to improve bus latency/throughput for application with
intensive QuiccEngine activity.

Signed-off-by: Heiko Schocher <hs@denx.de>
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>

cpu/mpc83xx/cpu_init.c

@@ -69,6 +69,12 @@ void cpu_init_f (volatile immap_t * im)
 #endif
 #ifdef CONFIG_SYS_ACR_RPTCNT /* Arbiter repeat count */
 		(ACR_RPTCNT << ACR_RPTCNT_SHIFT) |
+#endif
+#ifdef CONFIG_SYS_ACR_APARK	/* Arbiter address parking mode */
+		(ACR_APARK << ACR_APARK_SHIFT) |
+#endif
+#ifdef CONFIG_SYS_ACR_PARKM	/* Arbiter parking master */
+		(ACR_PARKM << ACR_PARKM_SHIFT) |
 #endif
 		0;
 	__be32 acr_val =
@@ -77,6 +83,12 @@ void cpu_init_f (volatile immap_t * im)
 #endif
 #ifdef CONFIG_SYS_ACR_RPTCNT /* Arbiter repeat count */
 		(CONFIG_SYS_ACR_RPTCNT << ACR_RPTCNT_SHIFT) |
+#endif
+#ifdef CONFIG_SYS_ACR_APARK	/* Arbiter address parking mode */
+		(CONFIG_SYS_ACR_APARK << ACR_APARK_SHIFT) |
+#endif
+#ifdef CONFIG_SYS_ACR_PARKM	/* Arbiter parking master */
+		(CONFIG_SYS_ACR_PARKM << ACR_PARKM_SHIFT) |
 #endif
 		0;
 	__be32 spcr_mask =

include/configs/kmeter1.h

@@ -71,6 +71,14 @@
  */
 #define CONFIG_SYS_IMMR		0xE0000000
 
+/*
+ * Bus Arbitration Configuration Register (ACR)
+ */
+#define CONFIG_SYS_ACR_PIPE_DEP 3       /* pipeline depth 4 transactions */
+#define CONFIG_SYS_ACR_RPTCNT   3       /* 4 consecutive transactions */
+#define CONFIG_SYS_ACR_APARK    0       /* park bus to master (below) */
+#define CONFIG_SYS_ACR_PARKM    3       /* parking master = QuiccEngine */
+
 /*
  * DDR Setup
  */