arm/mach-mvebu/coherency.c

3  * Coherency fabric (Aurora) support for Armada 370, 375, 38x and XP
12  * The Armada 370, 375, 38x and XP SOCs have a coherency fabric which is
13  * responsible for ensuring hardware coherency between all CPUs and between
14  * CPUs and I/O masters. This file initializes the coherency fabric and
15  * supplies basic routines for configuring and controlling hardware coherency
18 #define pr_fmt(fmt) "mvebu-coherency: " fmt
34 #include "coherency.h"
42 /* Coherency fabric registers */
53 	{.compatible = "marvell,coherency-fabric",
55 	{.compatible = "marvell,armada-375-coherency-fabric",
57 	{.compatible = "marvell,armada-380-coherency-fabric",
76  * coherency is used, this bit causes unnecessary flushes of the L2
126 	 * which they read before they join the coherency  in armada_370_coherency_init()
148 				  "arm/mvebu/coherency:starting",  in armada_370_coherency_init()
157  * needed for the HW I/O coherency mechanism to work properly without
177 	 * We should switch the PL310 to I/O coherency mode only if  in armada_375_380_coherency_init()
178 	 * I/O coherency is actually enabled.  in armada_375_380_coherency_init()
206 	 * The coherency fabric is needed:  in coherency_type()
207 	 * - For coherency between processors on Armada XP, so only  in coherency_type()
209 	 * - For coherency between the processor and I/O devices, but  in coherency_type()
210 	 *   this coherency requires many pre-requisites (write  in coherency_type()
215 	 * no way to use hardware I/O coherency, because even when  in coherency_type()
247 			pr_warn("Coherency fabric is not initialized\n");  in set_cpu_coherent()