[U-Boot] [PATCH v2 2/2] spi: cadence_qspi_apb: Use 32 bit indirect read transaction when possible

[Vignesh R]

According to Section 11.15.4.9.1 Indirect Read Controller of K2G SoC
TRM SPRUHY8D[1], the external master is only permitted to issue 32-bit
data interface reads until the last word of an indirect transfer
So, make sure that QSPI indirect reads are 32 bit sized except for the
final read. If the rxbuf is unaligned then use bounce buffer, so that
readsl() can be used instead of readsb() to avoid non 32-bit accesses.

[1]www.ti.com/lit/ug/spruhy8d/spruhy8d.pdf

Signed-off-by: Vignesh R <vigneshr at ti.com>
Reviewed-by: Marek Vasut <marex at denx.de>
---

v2: rebase on top of latest rc
Link to v1: https://patchwork.ozlabs.org/patch/700990/

 drivers/spi/cadence_qspi_apb.c | 22 ++++++++++++++++------
 1 file changed, 16 insertions(+), 6 deletions(-)

diff --git a/drivers/spi/cadence_qspi_apb.c b/drivers/spi/cadence_qspi_apb.c
index 5d5b6f0d350b..e02f2217f45f 100644
--- a/drivers/spi/cadence_qspi_apb.c
+++ b/drivers/spi/cadence_qspi_apb.c
@@ -634,6 +634,8 @@ int cadence_qspi_apb_indirect_read_execute(struct cadence_spi_platdata *plat,
 {
 	unsigned int remaining = n_rx;
 	unsigned int bytes_to_read = 0;
+	struct bounce_buffer bb;
+	u8 *bb_rxbuf;
 	int ret;
 
 	writel(n_rx, plat->regbase + CQSPI_REG_INDIRECTRDBYTES);
@@ -642,6 +644,11 @@ int cadence_qspi_apb_indirect_read_execute(struct cadence_spi_platdata *plat,
 	writel(CQSPI_REG_INDIRECTRD_START,
 	       plat->regbase + CQSPI_REG_INDIRECTRD);
 
+	ret = bounce_buffer_start(&bb, (void *)rxbuf, n_rx, GEN_BB_WRITE);
+	if (ret)
+		return ret;
+	bb_rxbuf = bb.bounce_buffer;
+
 	while (remaining > 0) {
 		ret = cadence_qspi_wait_for_data(plat);
 		if (ret < 0) {
@@ -655,12 +662,13 @@ int cadence_qspi_apb_indirect_read_execute(struct cadence_spi_platdata *plat,
 			bytes_to_read *= CQSPI_FIFO_WIDTH;
 			bytes_to_read = bytes_to_read > remaining ?
 					remaining : bytes_to_read;
-			/* Handle non-4-byte aligned access to avoid data abort. */
-			if (((uintptr_t)rxbuf % 4) || (bytes_to_read % 4))
-				readsb(plat->ahbbase, rxbuf, bytes_to_read);
-			else
-				readsl(plat->ahbbase, rxbuf, bytes_to_read >> 2);
-			rxbuf += bytes_to_read;
+			readsl(plat->ahbbase, bb_rxbuf, bytes_to_read >> 2);
+			if (bytes_to_read % 4)
+				readsb(plat->ahbbase,
+				       bb_rxbuf + rounddown(bytes_to_read, 4),
+				       bytes_to_read % 4);
+
+			bb_rxbuf += bytes_to_read;
 			remaining -= bytes_to_read;
 			bytes_to_read = cadence_qspi_get_rd_sram_level(plat);
 		}
@@ -677,6 +685,7 @@ int cadence_qspi_apb_indirect_read_execute(struct cadence_spi_platdata *plat,
 	/* Clear indirect completion status */
 	writel(CQSPI_REG_INDIRECTRD_DONE,
 	       plat->regbase + CQSPI_REG_INDIRECTRD);
+	bounce_buffer_stop(&bb);
 
 	return 0;
 
@@ -684,6 +693,7 @@ failrd:
 	/* Cancel the indirect read */
 	writel(CQSPI_REG_INDIRECTRD_CANCEL,
 	       plat->regbase + CQSPI_REG_INDIRECTRD);
+	bounce_buffer_stop(&bb);
 	return ret;
 }
 
-- 
2.11.0