| Message ID | 1633015924-881-4-git-send-email-deesin@codeaurora.org (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | rpmsg and glink signaling api support | expand |
Quoting Deepak Kumar Singh (2021-09-30 08:32:03) > diff --git a/drivers/rpmsg/qcom_glink_native.c b/drivers/rpmsg/qcom_glink_native.c > index 05533c7..384fcd2 100644 > --- a/drivers/rpmsg/qcom_glink_native.c > +++ b/drivers/rpmsg/qcom_glink_native.c > @@ -976,6 +984,68 @@ 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; Drop assignment. > + > + /** > + * convert signals from TIOCM to NATIVE > + * sigs = TIOCM_DTR|TIOCM_RTS > + */ > + if (enable) > + sigs |= (NATIVE_DTR_SIG | NATIVE_CTS_SIG); sigs = NATIVE_DTR_SIG | NATIVE_CTS_SIG; > + else > + sigs |= (~(NATIVE_DTR_SIG | NATIVE_CTS_SIG)); sigs = ~(NATIVE_DTR_SIG | NATIVE_CTS_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; > + > + spin_lock_irqsave(&glink->idr_lock, flags); irqsave can be skipped because this is only called from an irq handler. > + 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; > + } > + > + /* convert signals from NATIVE to TIOCM */ > + if (sigs & NATIVE_DTR_SIG) > + sigs |= TIOCM_DSR; > + if (sigs & NATIVE_CTS_SIG) > + sigs |= TIOCM_CTS; > + if (sigs & NATIVE_CD_SIG) > + sigs |= TIOCM_CD; > + if (sigs & NATIVE_RI_SIG) > + sigs |= TIOCM_RI; > + sigs &= 0x0fff; Is this to only keep TIOCM_* bits? Maybe make this an ORed together mask of those bits so we know what 0xfff means. > + > + if (channel->ept.sig_cb) > + channel->ept.sig_cb(channel->ept.rpdev, channel->ept.priv, sigs); > + > + return 0; > +} > + > static irqreturn_t qcom_glink_native_intr(int irq, void *data) > { > struct qcom_glink *glink = data; > @@ -1037,6 +1107,10 @@ 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); Should the return value be handled and if there isn't a channel then treat it as a spurious irq? > + qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); > + break; > default: > dev_err(glink->dev, "unhandled rx cmd: %d\n", cmd); > ret = -EINVAL;
On Thu, Sep 30, 2021 at 09:02:03PM +0530, Deepak Kumar Singh wrote: > Remote peripherals send signal notifications over glink with commandID 15. > > Add support to send and receive the signal command and convert the signals > from NATIVE to TIOCM while receiving and vice versa while sending. > > Signed-off-by: Chris Lew <clew@codeaurora.org> > Signed-off-by: Deepak Kumar Singh <deesin@codeaurora.org> > --- > drivers/rpmsg/qcom_glink_native.c | 75 +++++++++++++++++++++++++++++++++++++++ > 1 file changed, 75 insertions(+) > > diff --git a/drivers/rpmsg/qcom_glink_native.c b/drivers/rpmsg/qcom_glink_native.c > index 05533c7..384fcd2 100644 > --- a/drivers/rpmsg/qcom_glink_native.c > +++ b/drivers/rpmsg/qcom_glink_native.c > > ... > > +static int qcom_glink_handle_signals(struct qcom_glink *glink, > + unsigned int rcid, unsigned int sigs) > +{ > + struct glink_channel *channel; > + unsigned long flags; > + > + 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; > + } > + > + /* convert signals from NATIVE to TIOCM */ > + if (sigs & NATIVE_DTR_SIG) > + sigs |= TIOCM_DSR; > + if (sigs & NATIVE_CTS_SIG) > + sigs |= TIOCM_CTS; > + if (sigs & NATIVE_CD_SIG) > + sigs |= TIOCM_CD; > + if (sigs & NATIVE_RI_SIG) > + sigs |= TIOCM_RI; > + sigs &= 0x0fff; 'sigs' is only used when the channel has a signal handler, hence you could return before the above block if there is no signal handler and remove the condition below. > + > + if (channel->ept.sig_cb) > + channel->ept.sig_cb(channel->ept.rpdev, channel->ept.priv, sigs); > + > + return 0; > +}
diff --git a/drivers/rpmsg/qcom_glink_native.c b/drivers/rpmsg/qcom_glink_native.c index 05533c7..384fcd2 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> @@ -201,9 +202,16 @@ 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 BIT(31) +#define NATIVE_CTS_SIG BIT(30) +#define NATIVE_CD_SIG BIT(29) +#define NATIVE_RI_SIG BIT(28) + + static void qcom_glink_rx_done_work(struct work_struct *work); static struct glink_channel *qcom_glink_alloc_channel(struct qcom_glink *glink, @@ -976,6 +984,68 @@ 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; + + /** + * convert signals from TIOCM to NATIVE + * sigs = TIOCM_DTR|TIOCM_RTS + */ + if (enable) + sigs |= (NATIVE_DTR_SIG | NATIVE_CTS_SIG); + else + sigs |= (~(NATIVE_DTR_SIG | NATIVE_CTS_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; + + 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; + } + + /* convert signals from NATIVE to TIOCM */ + if (sigs & NATIVE_DTR_SIG) + sigs |= TIOCM_DSR; + if (sigs & NATIVE_CTS_SIG) + sigs |= TIOCM_CTS; + if (sigs & NATIVE_CD_SIG) + sigs |= TIOCM_CD; + if (sigs & NATIVE_RI_SIG) + sigs |= TIOCM_RI; + sigs &= 0x0fff; + + if (channel->ept.sig_cb) + channel->ept.sig_cb(channel->ept.rpdev, channel->ept.priv, sigs); + + return 0; +} + static irqreturn_t qcom_glink_native_intr(int irq, void *data) { struct qcom_glink *glink = data; @@ -1037,6 +1107,10 @@ 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; @@ -1382,6 +1456,7 @@ 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)