[PATCH v3 3/8] spi: dw: Add Microchip Sparx5 support

[Lars Povlsen <lars.povlsen@microchip.com>]

This adds SPI support for the Sparx5 SoC, which is using the MMIO
Designware SPI controller.

The Sparx5 differs from the Ocelot version in these areas:

 * The Sparx5 SPI controller has 2 different SPI bus interfaces on the
   same controller (don't ask...). The "mux-controls" property must be
   set, and the mux should be configured with the bus/device mapping
   information.

 * The CS override is controlled by a new set of registers for
   this purpose.

 * The Sparx5 SPI controller has the RX sample delay register, and it
   must be configured for the (SPI NAND) device on SPI2.

As Sparx5 requires CONFIG_MULTIPLEXER, this will automatically be
enabled when this driver is selected.

Signed-off-by: Lars Povlsen <lars.povlsen@microchip.com>
---
 drivers/spi/Kconfig       |  1 +
 drivers/spi/spi-dw-mmio.c | 79 ++++++++++++++++++++++++++++++++++++++-
 2 files changed, 79 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index 8f1f8fca79e37..2bc2d42b25120 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -237,6 +237,7 @@ config SPI_DW_PCI
 
 config SPI_DW_MMIO
 	tristate "Memory-mapped io interface driver for DW SPI core"
+	select MULTIPLEXER
 	depends on HAS_IOMEM
 
 endif
diff --git a/drivers/spi/spi-dw-mmio.c b/drivers/spi/spi-dw-mmio.c
index 403403deae664..05bc09be4a8bd 100644
--- a/drivers/spi/spi-dw-mmio.c
+++ b/drivers/spi/spi-dw-mmio.c
@@ -20,6 +20,7 @@
 #include <linux/property.h>
 #include <linux/regmap.h>
 #include <linux/reset.h>
+#include <linux/mux/consumer.h>
 
 #include "spi-dw.h"
 
@@ -45,6 +46,9 @@ struct dw_spi_mmio {
 #define MSCC_SPI_MST_SW_MODE_SW_PIN_CTRL_MODE	BIT(13)
 #define MSCC_SPI_MST_SW_MODE_SW_SPI_CS(x)	(x << 5)
 
+#define SPARX5_FORCE_ENA			0xa4
+#define SPARX5_FORCE_VAL			0xa8
+
 /*
  * For Keem Bay, CTRLR0[31] is used to select controller mode.
  * 0: SSI is slave
@@ -54,7 +58,8 @@ struct dw_spi_mmio {
 
 struct dw_spi_mscc {
 	struct regmap       *syscon;
-	void __iomem        *spi_mst;
+	void __iomem        *spi_mst; /* Not sparx5 */
+	struct mux_control  *spi_mux; /* Sparx5 bus interface */
 };
 
 /*
@@ -134,6 +139,77 @@ static int dw_spi_mscc_jaguar2_init(struct platform_device *pdev,
 				JAGUAR2_IF_SI_OWNER_OFFSET);
 }
 
+/*
+ * The Designware SPI controller (referred to as master in the
+ * documentation) automatically deasserts chip select when the tx fifo
+ * is empty. The chip selects then needs to be driven by a CS override
+ * register. enable is an active low signal.
+ */
+static void dw_spi_sparx5_set_cs(struct spi_device *spi, bool enable)
+{
+	struct dw_spi *dws = spi_master_get_devdata(spi->master);
+	struct dw_spi_mmio *dwsmmio = container_of(dws, struct dw_spi_mmio, dws);
+	struct dw_spi_mscc *dwsmscc = dwsmmio->priv;
+	u8 cs = spi->chip_select;
+
+	if (!enable) {
+		/* Drive mux */
+		if (mux_control_select(dwsmscc->spi_mux, cs))
+			dev_err(&spi->dev, "Unable to drive SPI mux\n");
+		/* CS override drive enable */
+		regmap_write(dwsmscc->syscon, SPARX5_FORCE_ENA, 1);
+		/* Now set CSx enabled */
+		regmap_write(dwsmscc->syscon, SPARX5_FORCE_VAL, ~BIT(cs));
+		/* Allow settle */
+		usleep_range(1, 5);
+	} else {
+		/* CS value */
+		regmap_write(dwsmscc->syscon, SPARX5_FORCE_VAL, ~0);
+		/* Allow settle */
+		usleep_range(1, 5);
+		/* CS override drive disable */
+		regmap_write(dwsmscc->syscon, SPARX5_FORCE_ENA, 0);
+		/* Deselect mux */
+		mux_control_deselect(dwsmscc->spi_mux);
+	}
+
+	dw_spi_set_cs(spi, enable);
+}
+
+static int dw_spi_mscc_sparx5_init(struct platform_device *pdev,
+				   struct dw_spi_mmio *dwsmmio)
+{
+	const char *syscon_name = "microchip,sparx5-cpu-syscon";
+	struct device *dev = &pdev->dev;
+	struct dw_spi_mscc *dwsmscc;
+
+	dwsmscc = devm_kzalloc(dev, sizeof(*dwsmscc), GFP_KERNEL);
+	if (!dwsmscc)
+		return -ENOMEM;
+
+	dwsmscc->syscon =
+		syscon_regmap_lookup_by_compatible(syscon_name);
+	if (IS_ERR(dwsmscc->syscon)) {
+		dev_err(dev, "No syscon map %s\n", syscon_name);
+		return PTR_ERR(dwsmscc->syscon);
+	}
+
+	/* Get SPI mux */
+	dwsmscc->spi_mux = devm_mux_control_get(dev, NULL);
+	if (IS_ERR(dwsmscc->spi_mux)) {
+		dev_err(dev, "SPI mux is required\n");
+		return PTR_ERR(dwsmscc->spi_mux);
+	}
+
+	dwsmmio->dws.set_cs = dw_spi_sparx5_set_cs;
+	dwsmmio->priv = dwsmscc;
+
+	/* Register hook to configure CTRLR0 */
+	dwsmmio->dws.update_cr0 = dw_spi_update_cr0;
+
+	return 0;
+}
+
 static int dw_spi_alpine_init(struct platform_device *pdev,
 			      struct dw_spi_mmio *dwsmmio)
 {
@@ -297,6 +373,7 @@ static const struct of_device_id dw_spi_mmio_of_match[] = {
 	{ .compatible = "renesas,rzn1-spi", .data = dw_spi_dw_apb_init},
 	{ .compatible = "snps,dwc-ssi-1.01a", .data = dw_spi_dwc_ssi_init},
 	{ .compatible = "intel,keembay-ssi", .data = dw_spi_keembay_init},
+	{ .compatible = "microchip,sparx5-spi", dw_spi_mscc_sparx5_init},
 	{ /* end of table */}
 };
 MODULE_DEVICE_TABLE(of, dw_spi_mmio_of_match);
-- 
2.27.0