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 <herve.codina@bootlin.com>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Link: https://lore.kernel.org/r/20231205152116.122512-18-herve.codina@bootlin.com

diff --git a/drivers/soc/fsl/qe/qmc.c b/drivers/soc/fsl/qe/qmc.c
index 45d9cb4..f498db9 100644 (file)
--- a/drivers/soc/fsl/qe/qmc.c
+++ b/drivers/soc/fsl/qe/qmc.c
@@ -290,6 +290,57 @@ int qmc_chan_get_info(struct qmc_chan *chan, struct qmc_chan_info *info)
 }
 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)

diff --git a/include/soc/fsl/qe/qmc.h b/include/soc/fsl/qe/qmc.h
index 166484b..2a333fc 100644 (file)
--- a/include/soc/fsl/qe/qmc.h
+++ b/include/soc/fsl/qe/qmc.h
@@ -40,6 +40,16 @@ struct qmc_chan_info {
 
 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 {