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ARM: mvebu: add Armada 375 support to the coherency code
The Armada 375, like the Armada 370 and Armada XP, has a coherency unit. However, unlike the coherency unit of 370/XP which does both CPU and I/O coherency, the one on Armada 735 only does I/O coherency. Therefore, instead of having two sets of registers (the first one being used mainly to register each CPU in the coherency fabric, the second one being used for the I/O coherency barrier), it has only one set of register (for the I/O coherency barrier). This commit adds a new "marvell,armada-375-coherency-fabric" compatible string for this variant of the coherency fabric. The custom DMA operations, and the way of triggering an I/O barrier is the same as Armada 370/XP, so the code changes are minimal. However, the set_cpu_coherent() function is not needed on Armada 375 and will not work. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Link: https://lkml.kernel.org/r/1397483228-25625-7-git-send-email-thomas.petazzoni@free-electrons.com Signed-off-by: Jason Cooper <jason@lakedaemon.net>
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@ -1,6 +1,6 @@
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Coherency fabric
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----------------
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Available on Marvell SOCs: Armada 370 and Armada XP
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Available on Marvell SOCs: Armada 370, Armada 375 and Armada XP
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Required properties:
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@ -9,11 +9,20 @@ Required properties:
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* "marvell,coherency-fabric", to be used for the coherency fabric of
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the Armada 370 and Armada XP.
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- reg: Should contain coherency fabric registers location and
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length. First pair for the coherency fabric registers, second pair
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for the per-CPU fabric registers registers.
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* "marvell,armada-375-coherency-fabric", for the Armada 375 coherency
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fabric.
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Example:
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- reg: Should contain coherency fabric registers location and
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length.
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* For "marvell,coherency-fabric", the first pair for the coherency
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fabric registers, second pair for the per-CPU fabric registers.
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* For "marvell,armada-375-coherency-fabric", only one pair is needed
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for the per-CPU fabric registers.
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Examples:
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coherency-fabric@d0020200 {
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compatible = "marvell,coherency-fabric";
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@ -22,3 +31,8 @@ coherency-fabric@d0020200 {
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};
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coherency-fabric@21810 {
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compatible = "marvell,armada-375-coherency-fabric";
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reg = <0x21810 0x1c>;
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};
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@ -41,11 +41,14 @@ static void __iomem *coherency_cpu_base;
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enum {
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COHERENCY_FABRIC_TYPE_NONE,
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COHERENCY_FABRIC_TYPE_ARMADA_370_XP,
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COHERENCY_FABRIC_TYPE_ARMADA_375,
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};
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static struct of_device_id of_coherency_table[] = {
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{.compatible = "marvell,coherency-fabric",
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.data = (void *) COHERENCY_FABRIC_TYPE_ARMADA_370_XP },
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{.compatible = "marvell,armada-375-coherency-fabric",
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.data = (void *) COHERENCY_FABRIC_TYPE_ARMADA_375 },
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{ /* end of list */ },
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};
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@ -145,6 +148,11 @@ static void __init armada_370_coherency_init(struct device_node *np)
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set_cpu_coherent(cpu_logical_map(smp_processor_id()), 0);
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}
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static void __init armada_375_coherency_init(struct device_node *np)
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{
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coherency_cpu_base = of_iomap(np, 0);
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}
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static int coherency_type(void)
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{
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struct device_node *np;
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@ -158,6 +166,10 @@ static int coherency_type(void)
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if (type == COHERENCY_FABRIC_TYPE_ARMADA_370_XP)
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return type;
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/* Armada 375 coherency works only on SMP */
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else if (type == COHERENCY_FABRIC_TYPE_ARMADA_375 && is_smp())
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return type;
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of_node_put(np);
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}
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@ -178,6 +190,8 @@ int __init coherency_init(void)
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if (type == COHERENCY_FABRIC_TYPE_ARMADA_370_XP)
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armada_370_coherency_init(np);
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else if (type == COHERENCY_FABRIC_TYPE_ARMADA_375)
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armada_375_coherency_init(np);
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return 0;
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}
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