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authorH Hartley Sweeten <hsweeten@visionengravers.com>2017-08-08 23:51:27 +0300
committerMark Brown <broonie@kernel.org>2017-08-09 19:52:57 +0300
commit16779622be1c8959d6a665e2b6886bb33885fcb1 (patch)
tree7be1f51f47534c97d3d9f15daa2a3c918bdcc836 /drivers/spi
parent8447e4781f033f56cb18c2ec0301ea5d207877fc (diff)
downloadlinux-16779622be1c8959d6a665e2b6886bb33885fcb1.tar.xz
spi: spi-ep93xx: add spi master prepare_transfer_hardware()
This driver currently enables the hardware at the start of every message and disabled it when the message is complete. Make it a bit smarter by adding the prepare_transfer_hardware() and unprepare_transfer_hardware() callbacks so that the core can enable/disable the hardware based on spi message queue. Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com> [chris: use u32 instead of unsigned int] Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/spi-ep93xx.c72
1 files changed, 33 insertions, 39 deletions
diff --git a/drivers/spi/spi-ep93xx.c b/drivers/spi/spi-ep93xx.c
index 0bd792020471..ce6ec164f2f2 100644
--- a/drivers/spi/spi-ep93xx.c
+++ b/drivers/spi/spi-ep93xx.c
@@ -111,33 +111,6 @@ struct ep93xx_spi {
/* converts bits per word to CR0.DSS value */
#define bits_per_word_to_dss(bpw) ((bpw) - 1)
-static int ep93xx_spi_enable(const struct ep93xx_spi *espi)
-{
- u32 val;
- int err;
-
- err = clk_enable(espi->clk);
- if (err)
- return err;
-
- val = readl(espi->mmio + SSPCR1);
- val |= SSPCR1_SSE;
- writel(val, espi->mmio + SSPCR1);
-
- return 0;
-}
-
-static void ep93xx_spi_disable(const struct ep93xx_spi *espi)
-{
- u32 val;
-
- val = readl(espi->mmio + SSPCR1);
- val &= ~SSPCR1_SSE;
- writel(val, espi->mmio + SSPCR1);
-
- clk_disable(espi->clk);
-}
-
static void ep93xx_spi_enable_interrupts(const struct ep93xx_spi *espi)
{
u32 val;
@@ -571,17 +544,6 @@ static void ep93xx_spi_process_message(struct ep93xx_spi *espi,
{
unsigned long timeout;
struct spi_transfer *t;
- int err;
-
- /*
- * Enable the SPI controller and its clock.
- */
- err = ep93xx_spi_enable(espi);
- if (err) {
- dev_err(&espi->pdev->dev, "failed to enable SPI controller\n");
- msg->status = err;
- return;
- }
/*
* Just to be sure: flush any data from RX FIFO.
@@ -619,7 +581,6 @@ static void ep93xx_spi_process_message(struct ep93xx_spi *espi,
* deselect the device and disable the SPI controller.
*/
ep93xx_spi_cs_control(msg->spi, false);
- ep93xx_spi_disable(espi);
}
static int ep93xx_spi_transfer_one_message(struct spi_master *master,
@@ -679,6 +640,37 @@ static irqreturn_t ep93xx_spi_interrupt(int irq, void *dev_id)
return IRQ_HANDLED;
}
+static int ep93xx_spi_prepare_hardware(struct spi_master *master)
+{
+ struct ep93xx_spi *espi = spi_master_get_devdata(master);
+ u32 val;
+ int ret;
+
+ ret = clk_enable(espi->clk);
+ if (ret)
+ return ret;
+
+ val = readl(espi->mmio + SSPCR1);
+ val |= SSPCR1_SSE;
+ writel(val, espi->mmio + SSPCR1);
+
+ return 0;
+}
+
+static int ep93xx_spi_unprepare_hardware(struct spi_master *master)
+{
+ struct ep93xx_spi *espi = spi_master_get_devdata(master);
+ u32 val;
+
+ val = readl(espi->mmio + SSPCR1);
+ val &= ~SSPCR1_SSE;
+ writel(val, espi->mmio + SSPCR1);
+
+ clk_disable(espi->clk);
+
+ return 0;
+}
+
static bool ep93xx_spi_dma_filter(struct dma_chan *chan, void *filter_param)
{
if (ep93xx_dma_chan_is_m2p(chan))
@@ -780,6 +772,8 @@ static int ep93xx_spi_probe(struct platform_device *pdev)
if (!master)
return -ENOMEM;
+ master->prepare_transfer_hardware = ep93xx_spi_prepare_hardware;
+ master->unprepare_transfer_hardware = ep93xx_spi_unprepare_hardware;
master->transfer_one_message = ep93xx_spi_transfer_one_message;
master->bus_num = pdev->id;
master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;