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authorNishanth Menon <nm@ti.com>2014-06-26 12:40:31 +0530
committerJason Cooper <jason@lakedaemon.net>2014-06-30 19:20:49 +0000
commit2f7d2fb71dd0c14f9c0fe66f2ed7b4685fa745e2 (patch)
tree41e0a9ae3da65a99c8913fb321c0e20faa063a22 /drivers/irqchip
parent8b09a45dc12f83f2312a47f0f0087ec4004ebacc (diff)
irqchip: crossbar: Introduce ti, max-crossbar-sources to identify valid crossbar mapping
Currently we attempt to map any crossbar value to an IRQ, however, this is not correct from hardware perspective. There is a max crossbar event number upto which hardware supports. So describe the same in device tree using 'ti,max-crossbar-sources' property and use it to validate requests. [ jac - remove MAX_SOURCES from binding doc, use integer because we shouldn't put implementation details in the binding docs ] 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/1403766634-18543-14-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.c21
1 files changed, 19 insertions, 2 deletions
diff --git a/drivers/irqchip/irq-crossbar.c b/drivers/irqchip/irq-crossbar.c
index 518d712c475a..c9f068ca7bc9 100644
--- a/drivers/irqchip/irq-crossbar.c
+++ b/drivers/irqchip/irq-crossbar.c
@@ -26,6 +26,7 @@
* struct crossbar_device - crossbar device description
* @int_max: maximum number of supported interrupts
* @safe_map: safe default value to initialize the crossbar
+ * @max_crossbar_sources: Maximum number of crossbar sources
* @irq_map: array of interrupts to crossbar number mapping
* @crossbar_base: crossbar base address
* @register_offsets: offsets for each irq number
@@ -34,6 +35,7 @@
struct crossbar_device {
uint int_max;
uint safe_map;
+ uint max_crossbar_sources;
uint *irq_map;
void __iomem *crossbar_base;
int *register_offsets;
@@ -117,12 +119,19 @@ static int crossbar_domain_xlate(struct irq_domain *d,
unsigned int *out_type)
{
int ret;
+ int req_num = intspec[1];
- ret = get_prev_map_irq(intspec[1]);
+ if (req_num >= cb->max_crossbar_sources) {
+ pr_err("%s: requested crossbar number %d > max %d\n",
+ __func__, req_num, cb->max_crossbar_sources);
+ return -EINVAL;
+ }
+
+ ret = get_prev_map_irq(req_num);
if (ret >= 0)
goto found;
- ret = allocate_free_irq(intspec[1]);
+ ret = allocate_free_irq(req_num);
if (ret < 0)
return ret;
@@ -153,6 +162,14 @@ static int __init crossbar_of_init(struct device_node *node)
if (!cb->crossbar_base)
goto err_cb;
+ of_property_read_u32(node, "ti,max-crossbar-sources",
+ &cb->max_crossbar_sources);
+ if (!cb->max_crossbar_sources) {
+ pr_err("missing 'ti,max-crossbar-sources' property\n");
+ ret = -EINVAL;
+ goto err_base;
+ }
+
of_property_read_u32(node, "ti,max-irqs", &max);
if (!max) {
pr_err("missing 'ti,max-irqs' property\n");