[PATCH v4 1/3] dmaengine: ti: edma: Clean up the 2x32bit array register accesses

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Introduce defines for getting the array index and the bit number within the
64bit array register pairs.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@xxxxxx>
---
 drivers/dma/ti/edma.c | 106 ++++++++++++++++++++++++------------------
 1 file changed, 61 insertions(+), 45 deletions(-)

diff --git a/drivers/dma/ti/edma.c b/drivers/dma/ti/edma.c
index 22ecbf55ac02..3fd7831d1279 100644
--- a/drivers/dma/ti/edma.c
+++ b/drivers/dma/ti/edma.c
@@ -124,6 +124,17 @@
 #define EDMA_CONT_PARAMS_FIXED_EXACT	 1002
 #define EDMA_CONT_PARAMS_FIXED_NOT_EXACT 1003
 
+/*
+ * 64bit array registers are split into two 32bit registers:
+ * reg0: channel/event 0-31
+ * reg1: channel/event 32-63
+ *
+ * bit 5 in the channel number tells the array index (0/1)
+ * bit 0-4 (0x1f) is the bit offset within the register
+ */
+#define EDMA_REG_ARRAY_INDEX(channel)	((channel) >> 5)
+#define EDMA_CHANNEL_BIT(channel)	(BIT((channel) & 0x1f))
+
 /* PaRAM slots are laid out like this */
 struct edmacc_param {
 	u32 opt;
@@ -432,15 +443,14 @@ static void edma_setup_interrupt(struct edma_chan *echan, bool enable)
 {
 	struct edma_cc *ecc = echan->ecc;
 	int channel = EDMA_CHAN_SLOT(echan->ch_num);
+	int idx = EDMA_REG_ARRAY_INDEX(channel);
+	int ch_bit = EDMA_CHANNEL_BIT(channel);
 
 	if (enable) {
-		edma_shadow0_write_array(ecc, SH_ICR, channel >> 5,
-					 BIT(channel & 0x1f));
-		edma_shadow0_write_array(ecc, SH_IESR, channel >> 5,
-					 BIT(channel & 0x1f));
+		edma_shadow0_write_array(ecc, SH_ICR, idx, ch_bit);
+		edma_shadow0_write_array(ecc, SH_IESR, idx, ch_bit);
 	} else {
-		edma_shadow0_write_array(ecc, SH_IECR, channel >> 5,
-					 BIT(channel & 0x1f));
+		edma_shadow0_write_array(ecc, SH_IECR, idx, ch_bit);
 	}
 }
 
@@ -578,26 +588,26 @@ static void edma_start(struct edma_chan *echan)
 {
 	struct edma_cc *ecc = echan->ecc;
 	int channel = EDMA_CHAN_SLOT(echan->ch_num);
-	int j = (channel >> 5);
-	unsigned int mask = BIT(channel & 0x1f);
+	int idx = EDMA_REG_ARRAY_INDEX(channel);
+	int ch_bit = EDMA_CHANNEL_BIT(channel);
 
 	if (!echan->hw_triggered) {
 		/* EDMA channels without event association */
-		dev_dbg(ecc->dev, "ESR%d %08x\n", j,
-			edma_shadow0_read_array(ecc, SH_ESR, j));
-		edma_shadow0_write_array(ecc, SH_ESR, j, mask);
+		dev_dbg(ecc->dev, "ESR%d %08x\n", idx,
+			edma_shadow0_read_array(ecc, SH_ESR, idx));
+		edma_shadow0_write_array(ecc, SH_ESR, idx, ch_bit);
 	} else {
 		/* EDMA channel with event association */
-		dev_dbg(ecc->dev, "ER%d %08x\n", j,
-			edma_shadow0_read_array(ecc, SH_ER, j));
+		dev_dbg(ecc->dev, "ER%d %08x\n", idx,
+			edma_shadow0_read_array(ecc, SH_ER, idx));
 		/* Clear any pending event or error */
-		edma_write_array(ecc, EDMA_ECR, j, mask);
-		edma_write_array(ecc, EDMA_EMCR, j, mask);
+		edma_write_array(ecc, EDMA_ECR, idx, ch_bit);
+		edma_write_array(ecc, EDMA_EMCR, idx, ch_bit);
 		/* Clear any SER */
-		edma_shadow0_write_array(ecc, SH_SECR, j, mask);
-		edma_shadow0_write_array(ecc, SH_EESR, j, mask);
-		dev_dbg(ecc->dev, "EER%d %08x\n", j,
-			edma_shadow0_read_array(ecc, SH_EER, j));
+		edma_shadow0_write_array(ecc, SH_SECR, idx, ch_bit);
+		edma_shadow0_write_array(ecc, SH_EESR, idx, ch_bit);
+		dev_dbg(ecc->dev, "EER%d %08x\n", idx,
+			edma_shadow0_read_array(ecc, SH_EER, idx));
 	}
 }
 
@@ -605,19 +615,19 @@ static void edma_stop(struct edma_chan *echan)
 {
 	struct edma_cc *ecc = echan->ecc;
 	int channel = EDMA_CHAN_SLOT(echan->ch_num);
-	int j = (channel >> 5);
-	unsigned int mask = BIT(channel & 0x1f);
+	int idx = EDMA_REG_ARRAY_INDEX(channel);
+	int ch_bit = EDMA_CHANNEL_BIT(channel);
 
-	edma_shadow0_write_array(ecc, SH_EECR, j, mask);
-	edma_shadow0_write_array(ecc, SH_ECR, j, mask);
-	edma_shadow0_write_array(ecc, SH_SECR, j, mask);
-	edma_write_array(ecc, EDMA_EMCR, j, mask);
+	edma_shadow0_write_array(ecc, SH_EECR, idx, ch_bit);
+	edma_shadow0_write_array(ecc, SH_ECR, idx, ch_bit);
+	edma_shadow0_write_array(ecc, SH_SECR, idx, ch_bit);
+	edma_write_array(ecc, EDMA_EMCR, idx, ch_bit);
 
 	/* clear possibly pending completion interrupt */
-	edma_shadow0_write_array(ecc, SH_ICR, j, mask);
+	edma_shadow0_write_array(ecc, SH_ICR, idx, ch_bit);
 
-	dev_dbg(ecc->dev, "EER%d %08x\n", j,
-		edma_shadow0_read_array(ecc, SH_EER, j));
+	dev_dbg(ecc->dev, "EER%d %08x\n", idx,
+		edma_shadow0_read_array(ecc, SH_EER, idx));
 
 	/* REVISIT:  consider guarding against inappropriate event
 	 * chaining by overwriting with dummy_paramset.
@@ -631,45 +641,49 @@ static void edma_stop(struct edma_chan *echan)
 static void edma_pause(struct edma_chan *echan)
 {
 	int channel = EDMA_CHAN_SLOT(echan->ch_num);
-	unsigned int mask = BIT(channel & 0x1f);
 
-	edma_shadow0_write_array(echan->ecc, SH_EECR, channel >> 5, mask);
+	edma_shadow0_write_array(echan->ecc, SH_EECR,
+				 EDMA_REG_ARRAY_INDEX(channel),
+				 EDMA_CHANNEL_BIT(channel));
 }
 
 /* Re-enable EDMA hardware events on the specified channel.  */
 static void edma_resume(struct edma_chan *echan)
 {
 	int channel = EDMA_CHAN_SLOT(echan->ch_num);
-	unsigned int mask = BIT(channel & 0x1f);
 
-	edma_shadow0_write_array(echan->ecc, SH_EESR, channel >> 5, mask);
+	edma_shadow0_write_array(echan->ecc, SH_EESR,
+				 EDMA_REG_ARRAY_INDEX(channel),
+				 EDMA_CHANNEL_BIT(channel));
 }
 
 static void edma_trigger_channel(struct edma_chan *echan)
 {
 	struct edma_cc *ecc = echan->ecc;
 	int channel = EDMA_CHAN_SLOT(echan->ch_num);
-	unsigned int mask = BIT(channel & 0x1f);
+	int idx = EDMA_REG_ARRAY_INDEX(channel);
+	int ch_bit = EDMA_CHANNEL_BIT(channel);
 
-	edma_shadow0_write_array(ecc, SH_ESR, (channel >> 5), mask);
+	edma_shadow0_write_array(ecc, SH_ESR, idx, ch_bit);
 
-	dev_dbg(ecc->dev, "ESR%d %08x\n", (channel >> 5),
-		edma_shadow0_read_array(ecc, SH_ESR, (channel >> 5)));
+	dev_dbg(ecc->dev, "ESR%d %08x\n", idx,
+		edma_shadow0_read_array(ecc, SH_ESR, idx));
 }
 
 static void edma_clean_channel(struct edma_chan *echan)
 {
 	struct edma_cc *ecc = echan->ecc;
 	int channel = EDMA_CHAN_SLOT(echan->ch_num);
-	int j = (channel >> 5);
-	unsigned int mask = BIT(channel & 0x1f);
+	int idx = EDMA_REG_ARRAY_INDEX(channel);
+	int ch_bit = EDMA_CHANNEL_BIT(channel);
 
-	dev_dbg(ecc->dev, "EMR%d %08x\n", j, edma_read_array(ecc, EDMA_EMR, j));
-	edma_shadow0_write_array(ecc, SH_ECR, j, mask);
+	dev_dbg(ecc->dev, "EMR%d %08x\n", idx,
+		edma_read_array(ecc, EDMA_EMR, idx));
+	edma_shadow0_write_array(ecc, SH_ECR, idx, ch_bit);
 	/* Clear the corresponding EMR bits */
-	edma_write_array(ecc, EDMA_EMCR, j, mask);
+	edma_write_array(ecc, EDMA_EMCR, idx, ch_bit);
 	/* Clear any SER */
-	edma_shadow0_write_array(ecc, SH_SECR, j, mask);
+	edma_shadow0_write_array(ecc, SH_SECR, idx, ch_bit);
 	edma_write(ecc, EDMA_CCERRCLR, BIT(16) | BIT(1) | BIT(0));
 }
 
@@ -699,7 +713,8 @@ static int edma_alloc_channel(struct edma_chan *echan,
 	int channel = EDMA_CHAN_SLOT(echan->ch_num);
 
 	/* ensure access through shadow region 0 */
-	edma_or_array2(ecc, EDMA_DRAE, 0, channel >> 5, BIT(channel & 0x1f));
+	edma_or_array2(ecc, EDMA_DRAE, 0, EDMA_REG_ARRAY_INDEX(channel),
+		       EDMA_CHANNEL_BIT(channel));
 
 	/* ensure no events are pending */
 	edma_stop(echan);
@@ -2496,8 +2511,9 @@ static int edma_pm_resume(struct device *dev)
 	for (i = 0; i < ecc->num_channels; i++) {
 		if (echan[i].alloced) {
 			/* ensure access through shadow region 0 */
-			edma_or_array2(ecc, EDMA_DRAE, 0, i >> 5,
-				       BIT(i & 0x1f));
+			edma_or_array2(ecc, EDMA_DRAE, 0,
+				       EDMA_REG_ARRAY_INDEX(i),
+				       EDMA_CHANNEL_BIT(i));
 
 			edma_setup_interrupt(&echan[i], true);
 
-- 
Peter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
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