Subject: [PATCH v7 14/30] soc: fsl: cpm1: qmc: Introduce qmc_chan_setup_tsa*

From: Herve Codina <[email-masked]>
Date: Thu, 28 Sep 2023 09:06:32 +0200

Introduce the qmc_chan_setup_tsa* functions to setup entries related
to the given channel.
Use them during QMC channels setup.

Signed-off-by: Herve Codina <[email-masked]>
Reviewed-by: Christophe Leroy <[email-masked]>
---
 drivers/soc/fsl/qe/qmc.c | 161 ++++++++++++++++++++++++++++++---------
 1 file changed, 125 insertions(+), 36 deletions(-)

diff --git a/drivers/soc/fsl/qe/qmc.c b/drivers/soc/fsl/qe/qmc.c
index 28acf4c8a141..8e8bd1942c08 100644
--- a/drivers/soc/fsl/qe/qmc.c
+++ b/drivers/soc/fsl/qe/qmc.c
@@ -240,6 +240,11 @@ static void qmc_clrbits16(void __iomem *addr, u16 clr)
 	qmc_write16(addr, qmc_read16(addr) & ~clr);
 }
 
+static void qmc_clrsetbits16(void __iomem *addr, u16 clr, u16 set)
+{
+	qmc_write16(addr, (qmc_read16(addr) & ~clr) | set);
+}
+
 static void qmc_write32(void __iomem *addr, u32 val)
 {
 	iowrite32be(val, addr);
@@ -562,6 +567,122 @@ static void qmc_chan_read_done(struct qmc_chan *chan)
 	spin_unlock_irqrestore(&chan->rx_lock, flags);
 }
 
+static int qmc_chan_setup_tsa_64rxtx(struct qmc_chan *chan, const struct tsa_serial_info *info)
+{
+	unsigned int i;
+	u16 curr;
+	u16 val;
+
+	/*
+	 * Use a common Tx/Rx 64 entries table.
+	 * Tx and Rx related stuffs must be identical
+	 */
+	if (chan->tx_ts_mask != chan->rx_ts_mask) {
+		dev_err(chan->qmc->dev, "chan %u uses different Rx and Tx TS\n", chan->id);
+		return -EINVAL;
+	}
+
+	val = QMC_TSA_VALID | QMC_TSA_MASK | QMC_TSA_CHANNEL(chan->id);
+
+	/* Check entries based on Rx stuff*/
+	for (i = 0; i < info->nb_rx_ts; i++) {
+		if (!(chan->rx_ts_mask & (((u64)1) << i)))
+			continue;
+
+		curr = qmc_read16(chan->qmc->scc_pram + QMC_GBL_TSATRX + (i * 2));
+		if (curr & QMC_TSA_VALID && (curr & ~QMC_TSA_WRAP) != val) {
+			dev_err(chan->qmc->dev, "chan %u TxRx entry %d already used\n",
+				chan->id, i);
+			return -EBUSY;
+		}
+	}
+
+	/* Set entries based on Rx stuff*/
+	for (i = 0; i < info->nb_rx_ts; i++) {
+		if (!(chan->rx_ts_mask & (((u64)1) << i)))
+			continue;
+
+		qmc_clrsetbits16(chan->qmc->scc_pram + QMC_GBL_TSATRX + (i * 2),
+				 ~QMC_TSA_WRAP, val);
+	}
+
+	return 0;
+}
+
+static int qmc_chan_setup_tsa_32rx_32tx(struct qmc_chan *chan, const struct tsa_serial_info *info)
+{
+	unsigned int i;
+	u16 curr;
+	u16 val;
+
+	/* Use a Tx 32 entries table and a Rx 32 entries table */
+
+	val = QMC_TSA_VALID | QMC_TSA_MASK | QMC_TSA_CHANNEL(chan->id);
+
+	/* Check entries based on Rx stuff */
+	for (i = 0; i < info->nb_rx_ts; i++) {
+		if (!(chan->rx_ts_mask & (((u64)1) << i)))
+			continue;
+
+		curr = qmc_read16(chan->qmc->scc_pram + QMC_GBL_TSATRX + (i * 2));
+		if (curr & QMC_TSA_VALID && (curr & ~QMC_TSA_WRAP) != val) {
+			dev_err(chan->qmc->dev, "chan %u Rx entry %d already used\n",
+				chan->id, i);
+			return -EBUSY;
+		}
+	}
+	/* Check entries based on Tx stuff */
+	for (i = 0; i < info->nb_tx_ts; i++) {
+		if (!(chan->tx_ts_mask & (((u64)1) << i)))
+			continue;
+
+		curr = qmc_read16(chan->qmc->scc_pram + QMC_GBL_TSATTX + (i * 2));
+		if (curr & QMC_TSA_VALID && (curr & ~QMC_TSA_WRAP) != val) {
+			dev_err(chan->qmc->dev, "chan %u Tx entry %d already used\n",
+				chan->id, i);
+			return -EBUSY;
+		}
+	}
+
+	/* Set entries based on Rx stuff */
+	for (i = 0; i < info->nb_rx_ts; i++) {
+		if (!(chan->rx_ts_mask & (((u64)1) << i)))
+			continue;
+
+		qmc_clrsetbits16(chan->qmc->scc_pram + QMC_GBL_TSATRX + (i * 2),
+				 ~QMC_TSA_WRAP, val);
+	}
+	/* Set entries based on Tx stuff */
+	for (i = 0; i < info->nb_tx_ts; i++) {
+		if (!(chan->tx_ts_mask & (((u64)1) << i)))
+			continue;
+
+		qmc_clrsetbits16(chan->qmc->scc_pram + QMC_GBL_TSATTX + (i * 2),
+				 ~QMC_TSA_WRAP, val);
+	}
+
+	return 0;
+}
+
+static int qmc_chan_setup_tsa(struct qmc_chan *chan)
+{
+	struct tsa_serial_info info;
+	int ret;
+
+	/* Retrieve info from the TSA related serial */
+	ret = tsa_serial_get_info(chan->qmc->tsa_serial, &info);
+	if (ret)
+		return ret;
+
+	/*
+	 * Setup one common 64 entries table or two 32 entries (one for Tx
+	 * and one for Tx) according to assigned TS numbers.
+	 */
+	return ((info.nb_tx_ts > 32) || (info.nb_rx_ts > 32)) ?
+		qmc_chan_setup_tsa_64rxtx(chan, &info) :
+		qmc_chan_setup_tsa_32rx_32tx(chan, &info);
+}
+
 static int qmc_chan_command(struct qmc_chan *chan, u8 qmc_opcode)
 {
 	return cpm_command(chan->id << 2, (qmc_opcode << 4) | 0x0E);
@@ -921,7 +1042,6 @@ static int qmc_of_parse_chans(struct qmc *qmc, struct device_node *np)
 
 static int qmc_init_tsa_64rxtx(struct qmc *qmc, const struct tsa_serial_info *info)
 {
-	struct qmc_chan *chan;
 	unsigned int i;
 	u16 val;
 
@@ -935,18 +1055,6 @@ static int qmc_init_tsa_64rxtx(struct qmc *qmc, const struct tsa_serial_info *in
 	for (i = 0; i < 64; i++)
 		qmc_write16(qmc->scc_pram + QMC_GBL_TSATRX + (i * 2), 0x0000);
 
-	/* Set entries based on Rx stuff*/
-	list_for_each_entry(chan, &qmc->chan_head, list) {
-		for (i = 0; i < info->nb_rx_ts; i++) {
-			if (!(chan->rx_ts_mask & (((u64)1) << i)))
-				continue;
-
-			val = QMC_TSA_VALID | QMC_TSA_MASK |
-			      QMC_TSA_CHANNEL(chan->id);
-			qmc_write16(qmc->scc_pram + QMC_GBL_TSATRX + (i * 2), val);
-		}
-	}
-
 	/* Set Wrap bit on last entry */
 	qmc_setbits16(qmc->scc_pram + QMC_GBL_TSATRX + ((info->nb_rx_ts - 1) * 2),
 		      QMC_TSA_WRAP);
@@ -963,7 +1071,6 @@ static int qmc_init_tsa_64rxtx(struct qmc *qmc, const struct tsa_serial_info *in
 
 static int qmc_init_tsa_32rx_32tx(struct qmc *qmc, const struct tsa_serial_info *info)
 {
-	struct qmc_chan *chan;
 	unsigned int i;
 	u16 val;
 
@@ -978,28 +1085,6 @@ static int qmc_init_tsa_32rx_32tx(struct qmc *qmc, const struct tsa_serial_info
 		qmc_write16(qmc->scc_pram + QMC_GBL_TSATTX + (i * 2), 0x0000);
 	}
 
-	/* Set entries based on Rx and Tx stuff*/
-	list_for_each_entry(chan, &qmc->chan_head, list) {
-		/* Rx part */
-		for (i = 0; i < info->nb_rx_ts; i++) {
-			if (!(chan->rx_ts_mask & (((u64)1) << i)))
-				continue;
-
-			val = QMC_TSA_VALID | QMC_TSA_MASK |
-			      QMC_TSA_CHANNEL(chan->id);
-			qmc_write16(qmc->scc_pram + QMC_GBL_TSATRX + (i * 2), val);
-		}
-		/* Tx part */
-		for (i = 0; i < info->nb_tx_ts; i++) {
-			if (!(chan->tx_ts_mask & (((u64)1) << i)))
-				continue;
-
-			val = QMC_TSA_VALID | QMC_TSA_MASK |
-			      QMC_TSA_CHANNEL(chan->id);
-			qmc_write16(qmc->scc_pram + QMC_GBL_TSATTX + (i * 2), val);
-		}
-	}
-
 	/* Set Wrap bit on last entries */
 	qmc_setbits16(qmc->scc_pram + QMC_GBL_TSATRX + ((info->nb_rx_ts - 1) * 2),
 		      QMC_TSA_WRAP);
@@ -1081,6 +1166,10 @@ static int qmc_setup_chan(struct qmc *qmc, struct qmc_chan *chan)
 
 	chan->qmc = qmc;
 
+	ret = qmc_chan_setup_tsa(chan);
+	if (ret)
+		return ret;
+
 	/* Set channel specific parameter base address */
 	chan->s_param = qmc->dpram + (chan->id * 64);
 	/* 16 bd per channel (8 rx and 8 tx) */
-- 
2.41.0