The transmit(Tx) channels are specified as the first entry and the
receive(Rx) channels are the second entry as per the device tree
bindings. Since we currently just support Tx, index 0 is hardcoded at
all required callsites.
In order to prepare for adding Rx support, let's remove those hardcoded
index and add boolean parameter to identify Tx/Rx channels when setting
them up.
Signed-off-by: Sudeep Holla <sudeep.ho...@arm.com>
---
drivers/firmware/arm_scmi/driver.c | 33 ++++++++++++++++--------------
1 file changed, 18 insertions(+), 15 deletions(-)
diff --git a/drivers/firmware/arm_scmi/driver.c
b/drivers/firmware/arm_scmi/driver.c
index 0bd2af0a008f..f7fb6d5bfc64 100644
--- a/drivers/firmware/arm_scmi/driver.c
+++ b/drivers/firmware/arm_scmi/driver.c
@@ -112,7 +112,7 @@ struct scmi_chan_info {
* @version: SCMI revision information containing protocol version,
* implementation version and (sub-)vendor identification.
* @minfo: Message info
- * @tx_idr: IDR object to map protocol id to channel info pointer
+ * @tx_idr: IDR object to map protocol id to Tx channel info pointer
* @protocols_imp: List of protocols implemented, currently maximum of
* MAX_PROTOCOLS_IMP elements allocated by the base protocol
* @node: List head
@@ -640,22 +640,26 @@ static int scmi_xfer_info_init(struct scmi_info *sinfo)
return 0;
}
-static int scmi_mailbox_check(struct device_node *np)
+static int scmi_mailbox_check(struct device_node *np, int idx)
{
- return of_parse_phandle_with_args(np, "mboxes", "#mbox-cells", 0, NULL);
+ return of_parse_phandle_with_args(np, "mboxes", "#mbox-cells",
+ idx, NULL);
}
-static inline int
-scmi_mbox_chan_setup(struct scmi_info *info, struct device *dev, int prot_id)
+static int scmi_mbox_chan_setup(struct scmi_info *info, struct device *dev,
+ int prot_id, bool tx)
{
- int ret;
+ int ret, idx;
struct resource res;
resource_size_t size;
struct device_node *shmem, *np = dev->of_node;
struct scmi_chan_info *cinfo;
struct mbox_client *cl;
- if (scmi_mailbox_check(np)) {
+ /* Transmit channel is first entry i.e. index 0 */
+ idx = tx ? 0 : 1;
+
+ if (scmi_mailbox_check(np, idx)) {
cinfo = idr_find(&info->tx_idr, SCMI_PROTOCOL_BASE);
goto idr_alloc;
}
@@ -669,11 +673,11 @@ scmi_mbox_chan_setup(struct scmi_info *info, struct
device *dev, int prot_id)
cl = &cinfo->cl;
cl->dev = dev;
cl->rx_callback = scmi_rx_callback;
- cl->tx_prepare = scmi_tx_prepare;
+ cl->tx_prepare = tx ? scmi_tx_prepare : NULL;
cl->tx_block = false;
- cl->knows_txdone = true;
+ cl->knows_txdone = tx;
- shmem = of_parse_phandle(np, "shmem", 0);
+ shmem = of_parse_phandle(np, "shmem", idx);
ret = of_address_to_resource(shmem, 0, &res);
of_node_put(shmem);
if (ret) {
@@ -688,8 +692,7 @@ scmi_mbox_chan_setup(struct scmi_info *info, struct device
*dev, int prot_id)
return -EADDRNOTAVAIL;
}
- /* Transmit channel is first entry i.e. index 0 */
- cinfo->chan = mbox_request_channel(cl, 0);
+ cinfo->chan = mbox_request_channel(cl, idx);
if (IS_ERR(cinfo->chan)) {
ret = PTR_ERR(cinfo->chan);
if (ret != -EPROBE_DEFER)
@@ -721,7 +724,7 @@ scmi_create_protocol_device(struct device_node *np, struct
scmi_info *info,
return;
}
- if (scmi_mbox_chan_setup(info, &sdev->dev, prot_id)) {
+ if (scmi_mbox_chan_setup(info, &sdev->dev, prot_id, true)) {
dev_err(&sdev->dev, "failed to setup transport\n");
scmi_device_destroy(sdev);
return;
@@ -741,7 +744,7 @@ static int scmi_probe(struct platform_device *pdev)
struct device_node *child, *np = dev->of_node;
/* Only mailbox method supported, check for the presence of one */
- if (scmi_mailbox_check(np)) {
+ if (scmi_mailbox_check(np, 0)) {
dev_err(dev, "no mailbox found in %pOF\n", np);
return -EINVAL;
}
@@ -769,7 +772,7 @@ static int scmi_probe(struct platform_device *pdev)
handle->dev = info->dev;
handle->version = &info->version;
- ret = scmi_mbox_chan_setup(info, dev, SCMI_PROTOCOL_BASE);
+ ret = scmi_mbox_chan_setup(info, dev, SCMI_PROTOCOL_BASE, true);
if (ret)
return ret;
--
2.17.1
