arm/mach-mvebu/coherency.c

2  * Coherency fabric (Aurora) support for Armada 370, 375, 38x and XP
15  * The Armada 370, 375, 38x and XP SOCs have a coherency fabric which is
16  * responsible for ensuring hardware coherency between all CPUs and between
17  * CPUs and I/O masters. This file initializes the coherency fabric and
18  * supplies basic routines for configuring and controlling hardware coherency
21 #define pr_fmt(fmt) "mvebu-coherency: " fmt
37 #include "coherency.h"
45 /* Coherency fabric registers */
56 	{.compatible = "marvell,coherency-fabric",
58 	{.compatible = "marvell,armada-375-coherency-fabric",
60 	{.compatible = "marvell,armada-380-coherency-fabric",
79  * coherency is used, this bit causes unnecessary flushes of the L2
129 	 * which they read before they join the coherency  in armada_370_coherency_init()
151 				  "arm/mvebu/coherency:starting",  in armada_370_coherency_init()
160  * needed for the HW I/O coherency mechanism to work properly without
180 	 * We should switch the PL310 to I/O coherency mode only if  in armada_375_380_coherency_init()
181 	 * I/O coherency is actually enabled.  in armada_375_380_coherency_init()
209 	 * The coherency fabric is needed:  in coherency_type()
210 	 * - For coherency between processors on Armada XP, so only  in coherency_type()
212 	 * - For coherency between the processor and I/O devices, but  in coherency_type()
213 	 *   this coherency requires many pre-requisites (write  in coherency_type()
218 	 * no way to use hardware I/O coherency, because even when  in coherency_type()
250 			pr_warn("Coherency fabric is not initialized\n");  in set_cpu_coherent()