[2/3] spi: mediatek: support adjust register define

Commit Message

Leilk Liu June 2, 2017, 7:18 a.m. UTC

this patch adds support for adjust register design.

Signed-off-by: Leilk Liu <[e-mail]>
---
 drivers/spi/spi-mt65xx.c                 |   45 ++++++++++++++++++++++++++----
 include/linux/platform_data/spi-mt65xx.h |    2 ++
 2 files changed, 42 insertions(+), 5 deletions(-)

Comments

Mark Brown June 6, 2017, 6:57 p.m. UTC | #1

On Fri, Jun 02, 2017 at 03:18:42PM +0800, Leilk Liu wrote:

> +	/* some IC design adjust register define */
> +	bool adjust_reg;

Can we have a name that's more specific to the particular quirk please?
The current name will get confusing if some future chip also needs
slightly different register settings.

Otherwise this looks good.

Leilk Liu June 8, 2017, 1:41 a.m. UTC | #2

On Tue, 2017-06-06 at 19:57 +0100, Mark Brown wrote:
> On Fri, Jun 02, 2017 at 03:18:42PM +0800, Leilk Liu wrote:
> 
> > +	/* some IC design adjust register define */
> > +	bool adjust_reg;
> 
> Can we have a name that's more specific to the particular quirk please?
> The current name will get confusing if some future chip also needs
> slightly different register settings.
> 
thanks for your suggestion, I'll fix it.

> Otherwise this looks good.

Patch

diff --git a/drivers/spi/spi-mt65xx.c b/drivers/spi/spi-mt65xx.c
index 278867a..3d7cd2d 100644
--- a/drivers/spi/spi-mt65xx.c
+++ b/drivers/spi/spi-mt65xx.c
@@ -35,11 +35,15 @@ 
 #define SPI_CMD_REG                       0x0018
 #define SPI_STATUS0_REG                   0x001c
 #define SPI_PAD_SEL_REG                   0x0024
+#define SPI_CFG2_REG                      0x0028
 
 #define SPI_CFG0_SCK_HIGH_OFFSET          0
 #define SPI_CFG0_SCK_LOW_OFFSET           8
 #define SPI_CFG0_CS_HOLD_OFFSET           16
 #define SPI_CFG0_CS_SETUP_OFFSET          24
+#define SPI_ADJUST_CFG0_SCK_LOW_OFFSET    16
+#define SPI_ADJUST_CFG0_CS_HOLD_OFFSET    0
+#define SPI_ADJUST_CFG0_CS_SETUP_OFFSET   16
 
 #define SPI_CFG1_CS_IDLE_OFFSET           0
 #define SPI_CFG1_PACKET_LOOP_OFFSET       8
@@ -55,6 +59,8 @@ 
 #define SPI_CMD_RST                  BIT(2)
 #define SPI_CMD_PAUSE_EN             BIT(4)
 #define SPI_CMD_DEASSERT             BIT(5)
+#define SPI_CMD_SAMPLE_SEL           BIT(6)
+#define SPI_CMD_CS_POL               BIT(7)
 #define SPI_CMD_CPHA                 BIT(8)
 #define SPI_CMD_CPOL                 BIT(9)
 #define SPI_CMD_RX_DMA               BIT(10)
@@ -80,6 +86,8 @@  struct mtk_spi_compatible {
 	bool need_pad_sel;
 	/* Must explicitly send dummy Tx bytes to do Rx only transfer */
 	bool must_tx;
+	/* some IC design adjust register define */
+	bool adjust_reg;
 };
 
 struct mtk_spi {
@@ -108,6 +116,8 @@  struct mtk_spi {
 static const struct mtk_chip_config mtk_default_chip_info = {
 	.rx_mlsb = 1,
 	.tx_mlsb = 1,
+	.cs_pol = 0,
+	.sample_sel = 0,
 };
 
 static const struct of_device_id mtk_spi_of_match[] = {
@@ -182,6 +192,17 @@  static int mtk_spi_prepare_message(struct spi_master *master,
 	reg_val |= SPI_CMD_RX_ENDIAN;
 #endif
 
+	if (mdata->dev_comp->adjust_reg) {
+		if (chip_config->cs_pol)
+			reg_val |= SPI_CMD_CS_POL;
+		else
+			reg_val &= ~SPI_CMD_CS_POL;
+		if (chip_config->sample_sel)
+			reg_val |= SPI_CMD_SAMPLE_SEL;
+		else
+			reg_val &= ~SPI_CMD_SAMPLE_SEL;
+	}
+
 	/* set finish and pause interrupt always enable */
 	reg_val |= SPI_CMD_FINISH_IE | SPI_CMD_PAUSE_IE;
 
@@ -233,11 +254,25 @@  static void mtk_spi_prepare_transfer(struct spi_master *master,
 	sck_time = (div + 1) / 2;
 	cs_time = sck_time * 2;
 
-	reg_val |= (((sck_time - 1) & 0xff) << SPI_CFG0_SCK_HIGH_OFFSET);
-	reg_val |= (((sck_time - 1) & 0xff) << SPI_CFG0_SCK_LOW_OFFSET);
-	reg_val |= (((cs_time - 1) & 0xff) << SPI_CFG0_CS_HOLD_OFFSET);
-	reg_val |= (((cs_time - 1) & 0xff) << SPI_CFG0_CS_SETUP_OFFSET);
-	writel(reg_val, mdata->base + SPI_CFG0_REG);
+	if (mdata->dev_comp->adjust_reg) {
+		reg_val |= (((sck_time - 1) & 0xffff)
+			   << SPI_CFG0_SCK_HIGH_OFFSET);
+		reg_val |= (((sck_time - 1) & 0xffff)
+			   << SPI_ADJUST_CFG0_SCK_LOW_OFFSET);
+		writel(reg_val, mdata->base + SPI_CFG2_REG);
+		reg_val |= (((cs_time - 1) & 0xffff)
+			   << SPI_ADJUST_CFG0_CS_HOLD_OFFSET);
+		reg_val |= (((cs_time - 1) & 0xffff)
+			   << SPI_ADJUST_CFG0_CS_SETUP_OFFSET);
+		writel(reg_val, mdata->base + SPI_CFG0_REG);
+	} else {
+		reg_val |= (((sck_time - 1) & 0xff)
+			   << SPI_CFG0_SCK_HIGH_OFFSET);
+		reg_val |= (((sck_time - 1) & 0xff) << SPI_CFG0_SCK_LOW_OFFSET);
+		reg_val |= (((cs_time - 1) & 0xff) << SPI_CFG0_CS_HOLD_OFFSET);
+		reg_val |= (((cs_time - 1) & 0xff) << SPI_CFG0_CS_SETUP_OFFSET);
+		writel(reg_val, mdata->base + SPI_CFG0_REG);
+	}
 
 	reg_val = readl(mdata->base + SPI_CFG1_REG);
 	reg_val &= ~SPI_CFG1_CS_IDLE_MASK;
diff --git a/include/linux/platform_data/spi-mt65xx.h b/include/linux/platform_data/spi-mt65xx.h
index 54b0448..ba4e4bb 100644
--- a/include/linux/platform_data/spi-mt65xx.h
+++ b/include/linux/platform_data/spi-mt65xx.h
@@ -16,5 +16,7 @@ 
 struct mtk_chip_config {
 	u32 tx_mlsb;
 	u32 rx_mlsb;
+	u32 cs_pol;
+	u32 sample_sel;
 };
 #endif