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Subject[PATCH V2 16/19] irqchip: crossbar: introduce ti,max-crossbar-sources to identify valid crossbar mapping
Date
From: Nishanth Menon <nm@ti.com>

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.

Signed-off-by: Nishanth Menon <nm@ti.com>
---
.../devicetree/bindings/arm/omap/crossbar.txt | 2 ++
drivers/irqchip/irq-crossbar.c | 21 ++++++++++++++++++--
2 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/arm/omap/crossbar.txt b/Documentation/devicetree/bindings/arm/omap/crossbar.txt
index fb88585..6d2e2f5 100644
--- a/Documentation/devicetree/bindings/arm/omap/crossbar.txt
+++ b/Documentation/devicetree/bindings/arm/omap/crossbar.txt
@@ -10,6 +10,7 @@ Required properties:
- compatible : Should be "ti,irq-crossbar"
- reg: Base address and the size of the crossbar registers.
- ti,max-irqs: Total number of irqs available at the interrupt controller.
+- ti,max-crossbar-sources: Maximum number of crossbar sources that can be routed.
- ti,reg-size: Size of a individual register in bytes. Every individual
register is assumed to be of same size. Valid sizes are 1, 2, 4.
- ti,irqs-reserved: List of the reserved irq lines that are not muxed using
@@ -22,6 +23,7 @@ Examples:
compatible = "ti,irq-crossbar";
reg = <0x4a002a48 0x130>;
ti,max-irqs = <160>;
+ ti,max-crossbar-sources = <400>;
ti,reg-size = <2>;
ti,irqs-reserved = <0 1 2 3 5 6 131 132 139 140>;
};
diff --git a/drivers/irqchip/irq-crossbar.c b/drivers/irqchip/irq-crossbar.c
index 2a73a66..cf69c4d 100644
--- a/drivers/irqchip/irq-crossbar.c
+++ b/drivers/irqchip/irq-crossbar.c
@@ -26,6 +26,7 @@
/**
* struct crossbar_device - crossbar device descriptio
* @int_max: maximum number of supported interrupts
+ * @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
@@ -33,6 +34,7 @@
*/
struct crossbar_device {
uint int_max;
+ uint max_crossbar_sources;
uint *irq_map;
void __iomem *crossbar_base;
int *register_offsets;
@@ -126,12 +128,19 @@ 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;
@@ -164,6 +173,14 @@ 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");
--
1.7.9.5


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