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authorNicolas Pitre <nicolas.pitre@linaro.org>2012-11-28 18:17:25 -0500
committerNicolas Pitre <nicolas.pitre@linaro.org>2013-06-19 16:54:27 -0400
commitdf321c43e3c3ed44d2434fd12d378736a82152d5 (patch)
tree4033cfc149e677c4276b27e32ec30e78ec175f84 /drivers/irqchip
parent8e9c2d29bf6fee7a99db920c8a08aa691c2973d3 (diff)
downloadvexpress-lsk-df321c43e3c3ed44d2434fd12d378736a82152d5.tar.gz
ARM: GIC: function to retrieve the physical address of the SGIR
In order to have early assembly code signal other CPUs in the system, we need to get the physical address for the SGIR register used to send IPIs. Because the register will be used with a precomputed CPU interface ID number, there is no need for any locking in the assembly code where this register is written to. Signed-off-by: Nicolas Pitre <nico@linaro.org>
Diffstat (limited to 'drivers/irqchip')
-rw-r--r--drivers/irqchip/irq-gic.c29
1 files changed, 29 insertions, 0 deletions
diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
index 29b876b98d4..8389e381f7c 100644
--- a/drivers/irqchip/irq-gic.c
+++ b/drivers/irqchip/irq-gic.c
@@ -757,6 +757,33 @@ void gic_migrate_target(unsigned int new_cpu_id)
}
}
}
+
+/*
+ * gic_get_sgir_physaddr - get the physical address for the SGI register
+ *
+ * REturn the physical address of the SGI register to be used
+ * by some early assembly code when the kernel is not yet available.
+ */
+static unsigned long gic_dist_physaddr;
+
+unsigned long gic_get_sgir_physaddr(void)
+{
+ if (!gic_dist_physaddr)
+ return 0;
+ return gic_dist_physaddr + GIC_DIST_SOFTINT;
+}
+
+void __init gic_init_physaddr(struct device_node *node)
+{
+ struct resource res;
+ if (of_address_to_resource(node, 0, &res) == 0) {
+ gic_dist_physaddr = res.start;
+ pr_info("GIC physical location is %#lx\n", gic_dist_physaddr);
+ }
+}
+
+#else
+#define gic_init_physaddr(node) do { } while(0)
#endif
static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq,
@@ -940,6 +967,8 @@ int __init gic_of_init(struct device_node *node, struct device_node *parent)
percpu_offset = 0;
gic_init_bases(gic_cnt, -1, dist_base, cpu_base, percpu_offset, node);
+ if (!gic_cnt)
+ gic_init_physaddr(node);
if (parent) {
irq = irq_of_parse_and_map(node, 0);