diff options
| author | Marc Zyngier <marc.zyngier@arm.com> | 2015-10-01 19:05:45 +0300 |
|---|---|---|
| committer | Marc Zyngier <marc.zyngier@arm.com> | 2015-10-16 15:07:15 +0300 |
| commit | a251b263346e38b9fafebeb49ada9ce894882616 (patch) | |
| tree | f9b28b1a854cd1e64ef4289503b3363fef9d85fd /drivers/of | |
| parent | deac7fc1c87f24099d7e15d8b662446497f57465 (diff) | |
| download | linux-a251b263346e38b9fafebeb49ada9ce894882616.tar.xz | |
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>
Diffstat (limited to 'drivers/of')
| -rw-r--r-- | drivers/of/irq.c | 43 |
1 files changed, 28 insertions, 15 deletions
diff --git a/drivers/of/irq.c b/drivers/of/irq.c index 89ebc612293d..ed64d98807f9 100644 --- a/drivers/of/irq.c +++ b/drivers/of/irq.c @@ -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) { |