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Subject[PATCH V3 4/4] firmware: imx-scu: Support one TX and one RX
Date
From: Peng Fan <peng.fan@nxp.com>

Current imx-scu requires four TX and four RX to communicate with
SCU. This is low efficient and causes lots of mailbox interrupts.

With imx-mailbox driver could support one TX to use all four transmit
registers and one RX to use all four receive registers, imx-scu
could use one TX and one RX.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
---

V3:
Check mbox fsl,imx8-mu-scu for fast_ipc

drivers/firmware/imx/imx-scu.c | 54 +++++++++++++++++++++++++++++++++---------
1 file changed, 43 insertions(+), 11 deletions(-)

diff --git a/drivers/firmware/imx/imx-scu.c b/drivers/firmware/imx/imx-scu.c
index f71eaa5bf52d..e94a5585b698 100644
--- a/drivers/firmware/imx/imx-scu.c
+++ b/drivers/firmware/imx/imx-scu.c
@@ -38,6 +38,7 @@ struct imx_sc_ipc {
struct device *dev;
struct mutex lock;
struct completion done;
+ bool fast_ipc;

/* temporarily store the SCU msg */
u32 *msg;
@@ -115,6 +116,7 @@ static void imx_scu_rx_callback(struct mbox_client *c, void *msg)
struct imx_sc_ipc *sc_ipc = sc_chan->sc_ipc;
struct imx_sc_rpc_msg *hdr;
u32 *data = msg;
+ int i;

if (!sc_ipc->msg) {
dev_warn(sc_ipc->dev, "unexpected rx idx %d 0x%08x, ignore!\n",
@@ -122,6 +124,19 @@ static void imx_scu_rx_callback(struct mbox_client *c, void *msg)
return;
}

+ if (sc_ipc->fast_ipc) {
+ hdr = msg;
+ sc_ipc->rx_size = hdr->size;
+ sc_ipc->msg[0] = *data++;
+
+ for (i = 1; i < sc_ipc->rx_size; i++)
+ sc_ipc->msg[i] = *data++;
+
+ complete(&sc_ipc->done);
+
+ return;
+ }
+
if (sc_chan->idx == 0) {
hdr = msg;
sc_ipc->rx_size = hdr->size;
@@ -147,6 +162,7 @@ static int imx_scu_ipc_write(struct imx_sc_ipc *sc_ipc, void *msg)
struct imx_sc_chan *sc_chan;
u32 *data = msg;
int ret;
+ int size;
int i;

/* Check size */
@@ -156,7 +172,8 @@ static int imx_scu_ipc_write(struct imx_sc_ipc *sc_ipc, void *msg)
dev_dbg(sc_ipc->dev, "RPC SVC %u FUNC %u SIZE %u\n", hdr->svc,
hdr->func, hdr->size);

- for (i = 0; i < hdr->size; i++) {
+ size = sc_ipc->fast_ipc ? 1 : hdr->size;
+ for (i = 0; i < size; i++) {
sc_chan = &sc_ipc->chans[i % 4];

/*
@@ -168,8 +185,10 @@ static int imx_scu_ipc_write(struct imx_sc_ipc *sc_ipc, void *msg)
* Wait for tx_done before every send to ensure that no
* queueing happens at the mailbox channel level.
*/
- wait_for_completion(&sc_chan->tx_done);
- reinit_completion(&sc_chan->tx_done);
+ if (!sc_ipc->fast_ipc) {
+ wait_for_completion(&sc_chan->tx_done);
+ reinit_completion(&sc_chan->tx_done);
+ }

ret = mbox_send_message(sc_chan->ch, &data[i]);
if (ret < 0)
@@ -246,6 +265,8 @@ static int imx_scu_probe(struct platform_device *pdev)
struct imx_sc_chan *sc_chan;
struct mbox_client *cl;
char *chan_name;
+ struct of_phandle_args args;
+ int num_channel;
int ret;
int i;

@@ -253,11 +274,20 @@ static int imx_scu_probe(struct platform_device *pdev)
if (!sc_ipc)
return -ENOMEM;

- for (i = 0; i < SCU_MU_CHAN_NUM; i++) {
- if (i < 4)
+ ret = of_parse_phandle_with_args(pdev->dev.of_node, "mboxes",
+ "#mbox-cells", 0, &args);
+ if (ret)
+ return ret;
+
+ sc_ipc->fast_ipc = of_device_is_compatible(args.np, "fsl,imx8-mu-scu");
+
+ num_channel = sc_ipc->fast_ipc ? 2 : SCU_MU_CHAN_NUM;
+ for (i = 0; i < num_channel; i++) {
+ if (i < num_channel / 2)
chan_name = kasprintf(GFP_KERNEL, "tx%d", i);
else
- chan_name = kasprintf(GFP_KERNEL, "rx%d", i - 4);
+ chan_name = kasprintf(GFP_KERNEL, "rx%d",
+ i - num_channel / 2);

if (!chan_name)
return -ENOMEM;
@@ -269,13 +299,15 @@ static int imx_scu_probe(struct platform_device *pdev)
cl->knows_txdone = true;
cl->rx_callback = imx_scu_rx_callback;

- /* Initial tx_done completion as "done" */
- cl->tx_done = imx_scu_tx_done;
- init_completion(&sc_chan->tx_done);
- complete(&sc_chan->tx_done);
+ if (!sc_ipc->fast_ipc) {
+ /* Initial tx_done completion as "done" */
+ cl->tx_done = imx_scu_tx_done;
+ init_completion(&sc_chan->tx_done);
+ complete(&sc_chan->tx_done);
+ }

sc_chan->sc_ipc = sc_ipc;
- sc_chan->idx = i % 4;
+ sc_chan->idx = i % (num_channel / 2);
sc_chan->ch = mbox_request_channel_byname(cl, chan_name);
if (IS_ERR(sc_chan->ch)) {
ret = PTR_ERR(sc_chan->ch);
--
2.16.4
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