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[5/6] spi/s3c64xx: Factor transfer start out of enable/disable_cs()

Message ID 1380311049-973-5-git-send-email-broonie@kernel.org (mailing list archive)
State New, archived
Headers show

Commit Message

Mark Brown Sept. 27, 2013, 7:44 p.m. UTC 
From: Mark Brown <broonie@linaro.org>

The hardware level /CS handling is tied to the start of the data path so
is rolled into the same function as we use to manipulate GPIO /CS. In
order to support factoring out the /CS handling into the core separate the
two and explicitly start transfers separately to the /CS handling.

Signed-off-by: Mark Brown <broonie@linaro.org>
---
 drivers/spi/spi-s3c64xx.c | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)
diff mbox

Patch

diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
index 43caeee..2ab96fb 100644
--- a/drivers/spi/spi-s3c64xx.c
+++ b/drivers/spi/spi-s3c64xx.c
@@ -570,9 +570,6 @@  static inline void enable_cs(struct s3c64xx_spi_driver_data *sdd,
 
 	if (spi->cs_gpio >= 0)
 		gpio_set_value(spi->cs_gpio, spi->mode & SPI_CS_HIGH ? 1 : 0);
-
-	/* Start the signals */
-	writel(0, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
 }
 
 static u32 s3c64xx_spi_wait_for_timeout(struct s3c64xx_spi_driver_data *sdd,
@@ -702,9 +699,6 @@  static inline void disable_cs(struct s3c64xx_spi_driver_data *sdd,
 
 	if (spi->cs_gpio >= 0)
 		gpio_set_value(spi->cs_gpio, spi->mode & SPI_CS_HIGH ? 0 : 1);
-
-	/* Quiese the signals */
-	writel(S3C64XX_SPI_SLAVE_SIG_INACT, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
 }
 
 static void s3c64xx_spi_config(struct s3c64xx_spi_driver_data *sdd)
@@ -930,6 +924,9 @@  static int s3c64xx_spi_transfer_one_message(struct spi_master *master,
 		/* Slave Select */
 		enable_cs(sdd, spi);
 
+		/* Start the signals */
+		writel(0, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
+
 		spin_unlock_irqrestore(&sdd->lock, flags);
 
 		status = wait_for_xfer(sdd, xfer, use_dma);
@@ -970,10 +967,14 @@  static int s3c64xx_spi_transfer_one_message(struct spi_master *master,
 	}
 
 out:
-	if (!cs_toggle || status)
+	if (!cs_toggle || status) {
+		/* Quiese the signals */
+		writel(S3C64XX_SPI_SLAVE_SIG_INACT,
+		       sdd->regs + S3C64XX_SPI_SLAVE_SEL);
 		disable_cs(sdd, spi);
-	else
+	} else {
 		sdd->tgl_spi = spi;
+	}
 
 	s3c64xx_spi_unmap_mssg(sdd, msg);
 
@@ -1112,11 +1113,13 @@  static int s3c64xx_spi_setup(struct spi_device *spi)
 	}
 
 	pm_runtime_put(&sdd->pdev->dev);
+	writel(S3C64XX_SPI_SLAVE_SIG_INACT, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
 	disable_cs(sdd, spi);
 	return 0;
 
 setup_exit:
 	/* setup() returns with device de-selected */
+	writel(S3C64XX_SPI_SLAVE_SIG_INACT, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
 	disable_cs(sdd, spi);
 
 	gpio_free(cs->line);