[RFC PATCH v1 2/3] spi: sunxi: Add support for R329/D1/R528/T113 SPI controller

[Maxim Kiselev]

These SoCs have two SPI controllers that are quite similar to the SPI
on previous Allwinner SoCs. The main difference is that new SoCs
don't have a clock divider (SPI_CCR register) inside SPI IP.

Instead SPI sample mode should be configured depending on the input clock.

For now SPI input clock source selection is not supported by this driver,
and only HOSC at 24MHz can be used as input clock. Therefore, according to
the, manual we could change the SPI sample mode from delay half
cycle(default) to normal.

This patch adds a quirk for this kind of SPI controllers

Signed-off-by: Maxim Kiselev <bigunclemax at gmail.com>
---
 drivers/spi/spi-sunxi.c | 34 +++++++++++++++++++++++++++++++++-
 1 file changed, 33 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-sunxi.c b/drivers/spi/spi-sunxi.c
index c56d82d998..9ec6b359e2 100644
--- a/drivers/spi/spi-sunxi.c
+++ b/drivers/spi/spi-sunxi.c
@@ -117,6 +117,8 @@ enum sun4i_spi_bits {
 	SPI_TCR_XCH,
 	SPI_TCR_CS_MANUAL,
 	SPI_TCR_CS_LEVEL,
+	SPI_TCR_SDC,
+	SPI_TCR_SDM,
 	SPI_FCR_TF_RST,
 	SPI_FCR_RF_RST,
 	SPI_FSR_RF_CNT_MASK,
@@ -128,6 +130,7 @@ struct sun4i_spi_variant {
 	u32 fifo_depth;
 	bool has_soft_reset;
 	bool has_burst_ctl;
+	bool has_clk_ctl;
 };
 
 struct sun4i_spi_plat {
@@ -302,7 +305,19 @@ static int sun4i_spi_claim_bus(struct udevice *dev)
 	setbits_le32(SPI_REG(priv, SPI_TCR), SPI_BIT(priv, SPI_TCR_CS_MANUAL) |
 		     SPI_BIT(priv, SPI_TCR_CS_ACTIVE_LOW));
 
-	sun4i_spi_set_speed_mode(dev->parent);
+	if (priv->variant->has_clk_ctl) {
+		sun4i_spi_set_speed_mode(dev->parent);
+	} else {
+		/*
+		 * At this moment there is no ability to change input clock.
+		 * Therefore, we can only use default HOSC at 24MHz clock and
+		 * set SPI sampling mode to normal
+		 */
+		clrsetbits_le32(SPI_REG(priv, SPI_TCR),
+				SPI_BIT(priv, SPI_TCR_SDC) |
+				SPI_BIT(priv, SPI_TCR_SDM),
+				SPI_BIT(priv, SPI_TCR_SDM));
+	}
 
 	return 0;
 }
@@ -516,6 +531,8 @@ static const u32 sun6i_spi_bits[] = {
 	[SPI_TCR_CS_MASK]	= 0x30,
 	[SPI_TCR_CS_MANUAL]	= BIT(6),
 	[SPI_TCR_CS_LEVEL]	= BIT(7),
+	[SPI_TCR_SDC]		= BIT(11),
+	[SPI_TCR_SDM]		= BIT(13),
 	[SPI_TCR_XCH]		= BIT(31),
 	[SPI_FCR_RF_RST]	= BIT(15),
 	[SPI_FCR_TF_RST]	= BIT(31),
@@ -526,6 +543,7 @@ static const struct sun4i_spi_variant sun4i_a10_spi_variant = {
 	.regs			= sun4i_spi_regs,
 	.bits			= sun4i_spi_bits,
 	.fifo_depth		= 64,
+	.has_clk_ctl		= true,
 };
 
 static const struct sun4i_spi_variant sun6i_a31_spi_variant = {
@@ -534,6 +552,7 @@ static const struct sun4i_spi_variant sun6i_a31_spi_variant = {
 	.fifo_depth		= 128,
 	.has_soft_reset		= true,
 	.has_burst_ctl		= true,
+	.has_clk_ctl		= true,
 };
 
 static const struct sun4i_spi_variant sun8i_h3_spi_variant = {
@@ -542,6 +561,15 @@ static const struct sun4i_spi_variant sun8i_h3_spi_variant = {
 	.fifo_depth		= 64,
 	.has_soft_reset		= true,
 	.has_burst_ctl		= true,
+	.has_clk_ctl		= true,
+};
+
+static const struct sun4i_spi_variant sun50i_r329_spi_variant = {
+	.regs			= sun6i_spi_regs,
+	.bits			= sun6i_spi_bits,
+	.fifo_depth		= 64,
+	.has_soft_reset		= true,
+	.has_burst_ctl		= true,
 };
 
 static const struct udevice_id sun4i_spi_ids[] = {
@@ -557,6 +585,10 @@ static const struct udevice_id sun4i_spi_ids[] = {
 	  .compatible = "allwinner,sun8i-h3-spi",
 	  .data = (ulong)&sun8i_h3_spi_variant,
 	},
+	{
+	  .compatible = "allwinner,sun50i-r329-spi",
+	  .data = (ulong)&sun50i_r329_spi_variant,
+	},
 	{ /* sentinel */ }
 };
 
-- 
2.39.2