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authorNishanth Menon <nm@ti.com>2014-06-26 11:10:22 +0400
committerJason Cooper <jason@lakedaemon.net>2014-06-30 23:11:20 +0400
commita35057d1dcb11ae67c9347ef7987cf65ac743c36 (patch)
treeb338c3dcaf1ffae0d5e59c0f29040150c38a8865 /drivers/irqchip
parent64e0f8ba5cae74471f72e0cb218c67915e365f47 (diff)
downloadlinux-a35057d1dcb11ae67c9347ef7987cf65ac743c36.tar.xz
irqchip: crossbar: Initialise the crossbar with a safe value
Since crossbar is s/w configurable, the initial settings of the crossbar cannot be assumed to be sane. This implies that: a) On initialization all un-reserved crossbars must be initialized to a known 'safe' value. b) When unmapping the interrupt, the safe value must be written to ensure that the crossbar mapping matches with interrupt controller usage. So provide a safe value in the dt data to map if '0' is not safe for the platform and use it during init and unmap While at this, fix the below checkpatch warning. Fixes checkpatch warning: WARNING: Unnecessary space before function pointer arguments #37: FILE: drivers/irqchip/irq-crossbar.c:37: + void (*write) (int, int); Signed-off-by: Nishanth Menon <nm@ti.com> Signed-off-by: Sricharan R <r.sricharan@ti.com> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Link: https://lkml.kernel.org/r/1403766634-18543-5-git-send-email-r.sricharan@ti.com Signed-off-by: Jason Cooper <jason@lakedaemon.net>
Diffstat (limited to 'drivers/irqchip')
-rw-r--r--drivers/irqchip/irq-crossbar.c19
1 files changed, 17 insertions, 2 deletions
diff --git a/drivers/irqchip/irq-crossbar.c b/drivers/irqchip/irq-crossbar.c
index 0533a71fa86f..4be30c00f041 100644
--- a/drivers/irqchip/irq-crossbar.c
+++ b/drivers/irqchip/irq-crossbar.c
@@ -23,16 +23,18 @@
/*
* @int_max: maximum number of supported interrupts
+ * @safe_map: safe default value to initialize the crossbar
* @irq_map: array of interrupts to crossbar number mapping
* @crossbar_base: crossbar base address
* @register_offsets: offsets for each irq number
*/
struct crossbar_device {
uint int_max;
+ uint safe_map;
uint *irq_map;
void __iomem *crossbar_base;
int *register_offsets;
- void (*write) (int, int);
+ void (*write)(int, int);
};
static struct crossbar_device *cb;
@@ -88,8 +90,10 @@ static void crossbar_domain_unmap(struct irq_domain *d, unsigned int irq)
{
irq_hw_number_t hw = irq_get_irq_data(irq)->hwirq;
- if (hw > GIC_IRQ_START)
+ if (hw > GIC_IRQ_START) {
cb->irq_map[hw - GIC_IRQ_START] = IRQ_FREE;
+ cb->write(hw - GIC_IRQ_START, cb->safe_map);
+ }
}
static int crossbar_domain_xlate(struct irq_domain *d,
@@ -214,6 +218,17 @@ static int __init crossbar_of_init(struct device_node *node)
reserved += size;
}
+ of_property_read_u32(node, "ti,irqs-safe-map", &cb->safe_map);
+
+ /* Initialize the crossbar with safe map to start with */
+ for (i = 0; i < max; i++) {
+ if (cb->irq_map[i] == IRQ_RESERVED ||
+ cb->irq_map[i] == IRQ_SKIP)
+ continue;
+
+ cb->write(i, cb->safe_map);
+ }
+
register_routable_domain_ops(&routable_irq_domain_ops);
return 0;