[tip:irq/core] irqchip/gicv3-its: Add HW revision detection and configuration

[tip-bot for Robert Richter <tipbot@zytor.com>]

Commit-ID:  67510ccafb9d69e79079b5cd6c9959025bc02061
Gitweb:     http://git.kernel.org/tip/67510ccafb9d69e79079b5cd6c9959025bc02061
Author:     Robert Richter <rrichter@cavium.com>
AuthorDate: Mon, 21 Sep 2015 22:58:37 +0200
Committer:  Thomas Gleixner <tglx@linutronix.de>
CommitDate: Tue, 29 Sep 2015 10:10:53 +0200

irqchip/gicv3-its: Add HW revision detection and configuration

Some GIC revisions require an individual configuration to esp. add
workarounds for HW bugs. This patch implements generic code to parse
the hw revision provided by an IIDR register value and runs specific
code if hw matches. A function is added that reads the IIDR registers
for ITS (GITS_IIDR) and then goes through a list of init functions to
be called for specific versions. Same could be done for GICV3
(GICD_IIDR), but there are no users yet for it.

The patch is needed to implement workarounds for HW errata in Cavium's
ThunderX GICV3 ITS.

Signed-off-by: Robert Richter <rrichter@cavium.com>
Reviewed-by: Marc Zygnier <marc.zyngier@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Tirumalesh Chalamarla <tchalamarla@cavium.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: Jason Cooper <jason@lakedaemon.net>
Link: http://lkml.kernel.org/r/1442869119-1814-5-git-send-email-rric@kernel.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 drivers/irqchip/irq-gic-common.c | 11 +++++++++++
 drivers/irqchip/irq-gic-common.h |  9 +++++++++
 drivers/irqchip/irq-gic-v3-its.c | 16 ++++++++++++++++
 3 files changed, 36 insertions(+)

diff --git a/drivers/irqchip/irq-gic-common.c b/drivers/irqchip/irq-gic-common.c
index 9448e39..44a077f 100644
--- a/drivers/irqchip/irq-gic-common.c
+++ b/drivers/irqchip/irq-gic-common.c
@@ -21,6 +21,17 @@
 
 #include "irq-gic-common.h"
 
+void gic_enable_quirks(u32 iidr, const struct gic_quirk *quirks,
+		void *data)
+{
+	for (; quirks->desc; quirks++) {
+		if (quirks->iidr != (quirks->mask & iidr))
+			continue;
+		quirks->init(data);
+		pr_info("GIC: enabling workaround for %s\n", quirks->desc);
+	}
+}
+
 int gic_configure_irq(unsigned int irq, unsigned int type,
 		       void __iomem *base, void (*sync_access)(void))
 {
diff --git a/drivers/irqchip/irq-gic-common.h b/drivers/irqchip/irq-gic-common.h
index 35a9884..fff697d 100644
--- a/drivers/irqchip/irq-gic-common.h
+++ b/drivers/irqchip/irq-gic-common.h
@@ -20,10 +20,19 @@
 #include <linux/of.h>
 #include <linux/irqdomain.h>
 
+struct gic_quirk {
+	const char *desc;
+	void (*init)(void *data);
+	u32 iidr;
+	u32 mask;
+};
+
 int gic_configure_irq(unsigned int irq, unsigned int type,
                        void __iomem *base, void (*sync_access)(void));
 void gic_dist_config(void __iomem *base, int gic_irqs,
 		     void (*sync_access)(void));
 void gic_cpu_config(void __iomem *base, void (*sync_access)(void));
+void gic_enable_quirks(u32 iidr, const struct gic_quirk *quirks,
+		void *data);
 
 #endif /* _IRQ_GIC_COMMON_H */
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 549e716..82622af 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -37,6 +37,8 @@
 #include <asm/cputype.h>
 #include <asm/exception.h>
 
+#include "irq-gic-common.h"
+
 #define ITS_FLAGS_CMDQ_NEEDS_FLUSHING		(1 << 0)
 
 #define RDIST_FLAGS_PROPBASE_NEEDS_FLUSHING	(1 << 0)
@@ -1375,6 +1377,18 @@ static int its_force_quiescent(void __iomem *base)
 	}
 }
 
+static const struct gic_quirk its_quirks[] = {
+	{
+	}
+};
+
+static void its_enable_quirks(struct its_node *its)
+{
+	u32 iidr = readl_relaxed(its->base + GITS_IIDR);
+
+	gic_enable_quirks(iidr, its_quirks, its);
+}
+
 static int its_probe(struct device_node *node, struct irq_domain *parent)
 {
 	struct resource res;
@@ -1433,6 +1447,8 @@ static int its_probe(struct device_node *node, struct irq_domain *parent)
 	}
 	its->cmd_write = its->cmd_base;
 
+	its_enable_quirks(its);
+
 	err = its_alloc_tables(node->full_name, its);
 	if (err)
 		goto out_free_cmd;