[PATCH 1/3] spi: mpc52xx: Avoid using get_tbl()

* [PATCH 1/3] spi: mpc52xx: Avoid using get_tbl()
@ 2021-02-09 10:26 Christophe Leroy
  2021-02-09 10:26 ` [PATCH 2/3] powerpc/time: " Christophe Leroy
                   ` (3 more replies)
  0 siblings, 4 replies; 5+ messages in thread
From: Christophe Leroy @ 2021-02-09 10:26 UTC (permalink / raw)
  To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman, broonie
  Cc: linux-kernel, linuxppc-dev, linux-spi

get_tbl() is confusing as it returns the content TBL register
on PPC32 but the concatenation of TBL and TBU on PPC64.

Use mftb() instead.

This will allow the removal of get_tbl() in a following patch.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
 drivers/spi/spi-mpc52xx.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/spi/spi-mpc52xx.c b/drivers/spi/spi-mpc52xx.c
index ef2f24420460..e6a30f232370 100644
--- a/drivers/spi/spi-mpc52xx.c
+++ b/drivers/spi/spi-mpc52xx.c
@@ -120,7 +120,7 @@ static void mpc52xx_spi_start_transfer(struct mpc52xx_spi *ms)
 	ms->cs_change = ms->transfer->cs_change;
 
 	/* Write out the first byte */
-	ms->wcol_tx_timestamp = get_tbl();
+	ms->wcol_tx_timestamp = mftb();
 	if (ms->tx_buf)
 		out_8(ms->regs + SPI_DATA, *ms->tx_buf++);
 	else
@@ -221,8 +221,8 @@ static int mpc52xx_spi_fsmstate_transfer(int irq, struct mpc52xx_spi *ms,
 		 * but it can also be worked around simply by retrying the
 		 * transfer which is what we do here. */
 		ms->wcol_count++;
-		ms->wcol_ticks += get_tbl() - ms->wcol_tx_timestamp;
-		ms->wcol_tx_timestamp = get_tbl();
+		ms->wcol_ticks += mftb() - ms->wcol_tx_timestamp;
+		ms->wcol_tx_timestamp = mftb();
 		data = 0;
 		if (ms->tx_buf)
 			data = *(ms->tx_buf - 1);
@@ -247,14 +247,14 @@ static int mpc52xx_spi_fsmstate_transfer(int irq, struct mpc52xx_spi *ms,
 	/* Is the transfer complete? */
 	ms->len--;
 	if (ms->len == 0) {
-		ms->timestamp = get_tbl();
+		ms->timestamp = mftb();
 		ms->timestamp += ms->transfer->delay_usecs * tb_ticks_per_usec;
 		ms->state = mpc52xx_spi_fsmstate_wait;
 		return FSM_CONTINUE;
 	}
 
 	/* Write out the next byte */
-	ms->wcol_tx_timestamp = get_tbl();
+	ms->wcol_tx_timestamp = mftb();
 	if (ms->tx_buf)
 		out_8(ms->regs + SPI_DATA, *ms->tx_buf++);
 	else
@@ -276,7 +276,7 @@ mpc52xx_spi_fsmstate_wait(int irq, struct mpc52xx_spi *ms, u8 status, u8 data)
 		dev_err(&ms->master->dev, "spurious irq, status=0x%.2x\n",
 			status);
 
-	if (((int)get_tbl()) - ms->timestamp < 0)
+	if (((int)mftb()) - ms->timestamp < 0)
 		return FSM_POLL;
 
 	ms->message->actual_length += ms->transfer->len;
-- 
2.25.0


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