soc: fsl: cpm1: qmc: Introduce functions to change timeslots at runtime

Introduce qmc_chan_{get,set}_ts_info() function to allow timeslots
modification at runtime.

The modification is provided using qmc_chan_set_ts_info() and will be
applied on next qmc_chan_start().
qmc_chan_set_ts_info() must be called with the channel rx and/or tx
stopped.

Signed-off-by: Herve Codina <[e-mail]>
Reviewed-by: Christophe Leroy <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/soc/fsl/qe/qmc.c

···
 }
 EXPORT_SYMBOL(qmc_chan_get_info);
 
+int qmc_chan_get_ts_info(struct qmc_chan *chan, struct qmc_chan_ts_info *ts_info)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&chan->ts_lock, flags);
+
+	ts_info->rx_ts_mask_avail = chan->rx_ts_mask_avail;
+	ts_info->tx_ts_mask_avail = chan->tx_ts_mask_avail;
+	ts_info->rx_ts_mask = chan->rx_ts_mask;
+	ts_info->tx_ts_mask = chan->tx_ts_mask;
+
+	spin_unlock_irqrestore(&chan->ts_lock, flags);
+
+	return 0;
+}
+EXPORT_SYMBOL(qmc_chan_get_ts_info);
+
+int qmc_chan_set_ts_info(struct qmc_chan *chan, const struct qmc_chan_ts_info *ts_info)
+{
+	unsigned long flags;
+	int ret;
+
+	/* Only a subset of available timeslots is allowed */
+	if ((ts_info->rx_ts_mask & chan->rx_ts_mask_avail) != ts_info->rx_ts_mask)
+		return -EINVAL;
+	if ((ts_info->tx_ts_mask & chan->tx_ts_mask_avail) != ts_info->tx_ts_mask)
+		return -EINVAL;
+
+	/* In case of common rx/tx table, rx/tx masks must be identical */
+	if (chan->qmc->is_tsa_64rxtx) {
+		if (ts_info->rx_ts_mask != ts_info->tx_ts_mask)
+			return -EINVAL;
+	}
+
+	spin_lock_irqsave(&chan->ts_lock, flags);
+
+	if ((chan->tx_ts_mask != ts_info->tx_ts_mask && !chan->is_tx_stopped) ||
+	    (chan->rx_ts_mask != ts_info->rx_ts_mask && !chan->is_rx_stopped)) {
+		dev_err(chan->qmc->dev, "Channel rx and/or tx not stopped\n");
+		ret = -EBUSY;
+	} else {
+		chan->tx_ts_mask = ts_info->tx_ts_mask;
+		chan->rx_ts_mask = ts_info->rx_ts_mask;
+		ret = 0;
+	}
+	spin_unlock_irqrestore(&chan->ts_lock, flags);
+
+	return ret;
+}
+EXPORT_SYMBOL(qmc_chan_set_ts_info);
+
 int qmc_chan_set_param(struct qmc_chan *chan, const struct qmc_chan_param *param)
 {
 	if (param->mode != chan->mode)

include/soc/fsl/qe/qmc.h

···
 
 int qmc_chan_get_info(struct qmc_chan *chan, struct qmc_chan_info *info);
 
+struct qmc_chan_ts_info {
+	u64 rx_ts_mask_avail;
+	u64 tx_ts_mask_avail;
+	u64 rx_ts_mask;
+	u64 tx_ts_mask;
+};
+
+int qmc_chan_get_ts_info(struct qmc_chan *chan, struct qmc_chan_ts_info *ts_info);
+int qmc_chan_set_ts_info(struct qmc_chan *chan, const struct qmc_chan_ts_info *ts_info);
+
 struct qmc_chan_param {
 	enum qmc_mode mode;
 	union {