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of/irq: Split of_msi_map_rid to reuse msi-map lookup 

The msi-map property is also used to identify the MSI controller
as a form of grown-up msi-parent property.

Looking it up is complicated enough, and since of_msi_map_rid
already implements this, let's turn it into an internal utility
function. We'll put that to good use later on.

Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Marc Zyngier 2015-10-01 17:05:45 +01:00
parent deac7fc1c8
commit a251b26334
1 changed files with 28 additions and 15 deletions
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43
drivers/of/irq.c
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@ -579,21 +579,12 @@ err:
}
}
/**
* of_msi_map_rid - Map a MSI requester ID for a device.
* @dev: device for which the mapping is to be done.
* @msi_np: device node of the expected msi controller.
* @rid_in: unmapped MSI requester ID for the device.
*
* Walk up the device hierarchy looking for devices with a "msi-map"
* property. If found, apply the mapping to @rid_in.
*
* Returns the mapped MSI requester ID.
*/
u32 of_msi_map_rid(struct device *dev, struct device_node *msi_np, u32 rid_in)
static u32 __of_msi_map_rid(struct device *dev, struct device_node **np,
u32 rid_in)
{
struct device *parent_dev;
struct device_node *msi_controller_node;
struct device_node *msi_np = *np;
u32 map_mask, masked_rid, rid_base, msi_base, rid_len, phandle;
int msi_map_len;
bool matched;
@ -643,9 +634,15 @@ u32 of_msi_map_rid(struct device *dev, struct device_node *msi_np, u32 rid_in)
msi_controller_node = of_find_node_by_phandle(phandle);
matched = masked_rid >= rid_base &&
masked_rid < rid_base + rid_len &&
msi_np == msi_controller_node;
matched = (masked_rid >= rid_base &&
masked_rid < rid_base + rid_len);
if (msi_np)
matched &= msi_np == msi_controller_node;
if (matched && !msi_np) {
*np = msi_np = msi_controller_node;
break;
}
of_node_put(msi_controller_node);
msi_map_len -= 4 * sizeof(__be32);
@ -663,6 +660,22 @@ u32 of_msi_map_rid(struct device *dev, struct device_node *msi_np, u32 rid_in)
return rid_out;
}
/**
* of_msi_map_rid - Map a MSI requester ID for a device.
* @dev: device for which the mapping is to be done.
* @msi_np: device node of the expected msi controller.
* @rid_in: unmapped MSI requester ID for the device.
*
* Walk up the device hierarchy looking for devices with a "msi-map"
* property. If found, apply the mapping to @rid_in.
*
* Returns the mapped MSI requester ID.
*/
u32 of_msi_map_rid(struct device *dev, struct device_node *msi_np, u32 rid_in)
{
return __of_msi_map_rid(dev, &msi_np, rid_in);
}
static struct irq_domain *__of_get_msi_domain(struct device_node *np,
enum irq_domain_bus_token token)
{