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Subject[PATCH V5 2/3] rpmsg: glink: Add support to handle signals command
Date
Remote peripherals send signal notifications over glink with commandID 15.

Add support to send and receive the signal command and based signals
enable or disable flow control with remote host.

Signed-off-by: Chris Lew <quic_clew@quicinc.com>
Signed-off-by: Deepak Kumar Singh <quic_deesin@quicinc.com>
Signed-off-by: Sarannya S <quic_sarannya@quicinc.com>
---
drivers/rpmsg/qcom_glink_native.c | 63 +++++++++++++++++++++++++++++++++++++++
1 file changed, 63 insertions(+)

diff --git a/drivers/rpmsg/qcom_glink_native.c b/drivers/rpmsg/qcom_glink_native.c
index 115c0a1..01d0a49 100644
--- a/drivers/rpmsg/qcom_glink_native.c
+++ b/drivers/rpmsg/qcom_glink_native.c
@@ -17,6 +17,7 @@
#include <linux/rpmsg.h>
#include <linux/sizes.h>
#include <linux/slab.h>
+#include <linux/termios.h>
#include <linux/workqueue.h>
#include <linux/mailbox_client.h>

@@ -203,9 +204,15 @@ static const struct rpmsg_endpoint_ops glink_endpoint_ops;
#define RPM_CMD_TX_DATA_CONT 12
#define RPM_CMD_READ_NOTIF 13
#define RPM_CMD_RX_DONE_W_REUSE 14
+#define RPM_CMD_SIGNALS 15

#define GLINK_FEATURE_INTENTLESS BIT(1)

+#define NATIVE_DTR_SIG NATIVE_DSR_SIG
+#define NATIVE_DSR_SIG BIT(31)
+#define NATIVE_RTS_SIG NATIVE_CTS_SIG
+#define NATIVE_CTS_SIG BIT(30)
+
static void qcom_glink_rx_done_work(struct work_struct *work);

static struct glink_channel *qcom_glink_alloc_channel(struct qcom_glink *glink,
@@ -1001,6 +1008,57 @@ static int qcom_glink_rx_open_ack(struct qcom_glink *glink, unsigned int lcid)
return 0;
}

+/**
+ * qcom_glink_set_flow_control() - convert a signal cmd to wire format and
+ * transmit
+ * @ept: Rpmsg endpoint for channel.
+ * @enable: True/False - enable or disable flow control
+ *
+ * Return: 0 on success or standard Linux error code.
+ */
+static int qcom_glink_set_flow_control(struct rpmsg_endpoint *ept, bool enable)
+{
+ struct glink_channel *channel = to_glink_channel(ept);
+ struct qcom_glink *glink = channel->glink;
+ struct glink_msg msg;
+ u32 sigs = 0;
+
+ if (enable)
+ sigs |= NATIVE_DTR_SIG | NATIVE_RTS_SIG;
+
+ msg.cmd = cpu_to_le16(RPM_CMD_SIGNALS);
+ msg.param1 = cpu_to_le16(channel->lcid);
+ msg.param2 = cpu_to_le32(sigs);
+
+ return qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true);
+}
+
+static int qcom_glink_handle_signals(struct qcom_glink *glink,
+ unsigned int rcid, unsigned int sigs)
+{
+ struct glink_channel *channel;
+ unsigned long flags;
+ bool enable = false;
+
+ spin_lock_irqsave(&glink->idr_lock, flags);
+ channel = idr_find(&glink->rcids, rcid);
+ spin_unlock_irqrestore(&glink->idr_lock, flags);
+ if (!channel) {
+ dev_err(glink->dev, "signal for non-existing channel\n");
+ return -EINVAL;
+ }
+
+ if (!channel->ept.flow_cb)
+ return 0;
+
+ if (sigs & (NATIVE_DSR_SIG | NATIVE_CTS_SIG))
+ enable = true;
+
+ channel->ept.flow_cb(channel->ept.rpdev, channel->ept.priv, enable);
+
+ return 0;
+}
+
static irqreturn_t qcom_glink_native_intr(int irq, void *data)
{
struct qcom_glink *glink = data;
@@ -1065,6 +1123,10 @@ static irqreturn_t qcom_glink_native_intr(int irq, void *data)
qcom_glink_handle_intent_req_ack(glink, param1, param2);
qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
break;
+ case RPM_CMD_SIGNALS:
+ qcom_glink_handle_signals(glink, param1, param2);
+ qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
+ break;
default:
dev_err(glink->dev, "unhandled rx cmd: %d\n", cmd);
ret = -EINVAL;
@@ -1440,6 +1502,7 @@ static const struct rpmsg_endpoint_ops glink_endpoint_ops = {
.sendto = qcom_glink_sendto,
.trysend = qcom_glink_trysend,
.trysendto = qcom_glink_trysendto,
+ .set_flow_control = qcom_glink_set_flow_control,
};

static void qcom_glink_rpdev_release(struct device *dev)
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
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