net: dsa: microchip: Initial SPI regmap support

Add basic SPI regmap support into the driver.

Previous patches unconver that ksz_spi_write() is always ever called
with len = 1, 2 or 4. We can thus drop the if (len > SPI_TX_BUF_LEN)
check and we can also drop the allocation of the txbuf which is part
of the driver data and wastes 256 bytes for no reason. Regmap covers
the whole thing now.
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Tristram Ha <Tristram.Ha@microchip.com>
Cc: Woojung Huh <Woojung.Huh@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/microchip/Kconfig

@@ -13,5 +13,6 @@ menuconfig NET_DSA_MICROCHIP_KSZ9477
 config NET_DSA_MICROCHIP_KSZ9477_SPI
 	tristate "KSZ9477 series SPI connected switch driver"
 	depends on NET_DSA_MICROCHIP_KSZ9477 && SPI
+	select REGMAP_SPI
 	help
 	  Select to enable support for registering switches configured through SPI.

drivers/net/dsa/microchip/ksz9477_spi.c

@@ -10,78 +10,54 @@
 #include <linux/delay.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/regmap.h>
 #include <linux/spi/spi.h>
 
 #include "ksz_priv.h"
 
-/* SPI frame opcodes */
-#define KS_SPIOP_RD			3
-#define KS_SPIOP_WR			2
-
 #define SPI_ADDR_SHIFT			24
-#define SPI_ADDR_MASK			(BIT(SPI_ADDR_SHIFT) - 1)
+#define SPI_ADDR_ALIGN			3
 #define SPI_TURNAROUND_SHIFT		5
 
-/* Enough to read all switch port registers. */
-#define SPI_TX_BUF_LEN			0x100
-
-static u32 ksz9477_spi_cmd(u32 reg, bool read)
-{
-	u32 txbuf;
-
-	txbuf = reg & SPI_ADDR_MASK;
-	txbuf |= (read ? KS_SPIOP_RD : KS_SPIOP_WR) << SPI_ADDR_SHIFT;
-	txbuf <<= SPI_TURNAROUND_SHIFT;
-	txbuf = cpu_to_be32(txbuf);
-
-	return txbuf;
-}
-
-static int ksz9477_spi_read_reg(struct spi_device *spi, u32 reg, u8 *val,
-				unsigned int len)
-{
-	u32 txbuf = ksz9477_spi_cmd(reg, true);
-
-	return spi_write_then_read(spi, &txbuf, 4, val, len);
-}
-
-static int ksz9477_spi_write_reg(struct spi_device *spi, u32 reg, u8 *val,
-				 unsigned int len)
-{
-	u32 *txbuf = (u32 *)val;
-
-	*txbuf = ksz9477_spi_cmd(reg, false);
-
-	return spi_write(spi, txbuf, 4 + len);
-}
-
-static int ksz_spi_read(struct ksz_device *dev, u32 reg, u8 *data,
-			unsigned int len)
-{
-	struct spi_device *spi = dev->priv;
-
-	return ksz9477_spi_read_reg(spi, reg, data, len);
-}
-
-static int ksz_spi_write(struct ksz_device *dev, u32 reg, void *data,
-			 unsigned int len)
-{
-	struct spi_device *spi = dev->priv;
+/* SPI frame opcodes */
+#define KS_SPIOP_RD			3
+#define KS_SPIOP_WR			2
 
-	if (len > SPI_TX_BUF_LEN)
-		len = SPI_TX_BUF_LEN;
-	memcpy(&dev->txbuf[4], data, len);
-	return ksz9477_spi_write_reg(spi, reg, dev->txbuf, len);
-}
+#define KS_SPIOP_FLAG_MASK(opcode)		\
+	swab32((opcode) << (SPI_ADDR_SHIFT + SPI_TURNAROUND_SHIFT))
+
+#define KSZ_REGMAP_COMMON(width)					\
+	{								\
+		.val_bits = (width),					\
+		.reg_stride = (width) / 8,				\
+		.reg_bits = SPI_ADDR_SHIFT + SPI_ADDR_ALIGN,		\
+		.pad_bits = SPI_TURNAROUND_SHIFT,			\
+		.max_register = BIT(SPI_ADDR_SHIFT) - 1,		\
+		.cache_type = REGCACHE_NONE,				\
+		.read_flag_mask = KS_SPIOP_FLAG_MASK(KS_SPIOP_RD),	\
+		.write_flag_mask = KS_SPIOP_FLAG_MASK(KS_SPIOP_WR),	\
+		.reg_format_endian = REGMAP_ENDIAN_BIG,			\
+		.val_format_endian = REGMAP_ENDIAN_BIG			\
+	}
+
+static const struct regmap_config ksz9477_regmap_config[] = {
+	KSZ_REGMAP_COMMON(8),
+	KSZ_REGMAP_COMMON(16),
+	KSZ_REGMAP_COMMON(32),
+};
 
 static int ksz_spi_read8(struct ksz_device *dev, u32 reg, u8 *val)
 {
-	return ksz_spi_read(dev, reg, val, 1);
+	unsigned int value;
+	int ret = regmap_read(dev->regmap, reg, &value);
+
+	*val = value;
+	return ret;
 }
 
 static int ksz_spi_read16(struct ksz_device *dev, u32 reg, u16 *val)
 {
-	int ret = ksz_spi_read(dev, reg, (u8 *)val, 2);
+	int ret = regmap_bulk_read(dev->regmap, reg, val, 2);
 
 	if (!ret)
 		*val = be16_to_cpu(*val);
@@ -91,7 +67,7 @@ static int ksz_spi_read16(struct ksz_device *dev, u32 reg, u16 *val)
 
 static int ksz_spi_read32(struct ksz_device *dev, u32 reg, u32 *val)
 {
-	int ret = ksz_spi_read(dev, reg, (u8 *)val, 4);
+	int ret = regmap_bulk_read(dev->regmap, reg, val, 4);
 
 	if (!ret)
 		*val = be32_to_cpu(*val);
@@ -101,19 +77,19 @@ static int ksz_spi_read32(struct ksz_device *dev, u32 reg, u32 *val)
 
 static int ksz_spi_write8(struct ksz_device *dev, u32 reg, u8 value)
 {
-	return ksz_spi_write(dev, reg, &value, 1);
+	return regmap_write(dev->regmap, reg, value);
 }
 
 static int ksz_spi_write16(struct ksz_device *dev, u32 reg, u16 value)
 {
 	value = cpu_to_be16(value);
-	return ksz_spi_write(dev, reg, &value, 2);
+	return regmap_bulk_write(dev->regmap, reg, &value, 2);
 }
 
 static int ksz_spi_write32(struct ksz_device *dev, u32 reg, u32 value)
 {
 	value = cpu_to_be32(value);
-	return ksz_spi_write(dev, reg, &value, 4);
+	return regmap_bulk_write(dev->regmap, reg, &value, 4);
 }
 
 static const struct ksz_io_ops ksz9477_spi_ops = {
@@ -128,17 +104,27 @@ static const struct ksz_io_ops ksz9477_spi_ops = {
 static int ksz9477_spi_probe(struct spi_device *spi)
 {
 	struct ksz_device *dev;
-	int ret;
+	int i, ret;
 
 	dev = ksz_switch_alloc(&spi->dev, &ksz9477_spi_ops, spi);
 	if (!dev)
 		return -ENOMEM;
 
+	for (i = 0; i < ARRAY_SIZE(ksz9477_regmap_config); i++) {
+		dev->regmap[i] = devm_regmap_init_spi(spi,
+					&ksz9477_regmap_config[i]);
+		if (IS_ERR(dev->regmap[i])) {
+			ret = PTR_ERR(dev->regmap[i]);
+			dev_err(&spi->dev,
+				"Failed to initialize regmap%i: %d\n",
+				ksz9477_regmap_config[i].val_bits, ret);
+			return ret;
+		}
+	}
+
 	if (spi->dev.platform_data)
 		dev->pdata = spi->dev.platform_data;
 
-	dev->txbuf = devm_kzalloc(dev->dev, 4 + SPI_TX_BUF_LEN, GFP_KERNEL);
-
 	ret = ksz9477_switch_register(dev);
 
 	/* Main DSA driver may not be started yet. */

drivers/net/dsa/microchip/ksz_priv.h

@@ -57,6 +57,7 @@ struct ksz_device {
 	const struct ksz_dev_ops *dev_ops;
 
 	struct device *dev;
+	struct regmap *regmap[3];
 
 	void *priv;
 
@@ -82,8 +83,6 @@ struct ksz_device {
 
 	struct vlan_table *vlan_cache;
 
-	u8 *txbuf;
-
 	struct ksz_port *ports;
 	struct timer_list mib_read_timer;
 	struct work_struct mib_read;