at86rf230: add regmap support

This patch adds regmap support for the at86rf230 driver and drop the
lowlevel spi access functions and use the regmap access functions.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ieee802154/Kconfig

@@ -34,6 +34,7 @@ config IEEE802154_AT86RF230
 	depends on IEEE802154_DRIVERS && MAC802154
 	tristate "AT86RF230/231/233/212 transceiver driver"
 	depends on SPI
+	select REGMAP_SPI
 	---help---
 	  Say Y here to enable the at86rf230/231/233/212 SPI 802.15.4 wireless
 	  controller.

drivers/net/ieee802154/at86rf230.c

@@ -31,6 +31,7 @@
 #include <linux/spinlock.h>
 #include <linux/spi/spi.h>
 #include <linux/spi/at86rf230.h>
+#include <linux/regmap.h>
 #include <linux/skbuff.h>
 #include <linux/of_gpio.h>
 
@@ -50,6 +51,7 @@ struct at86rf230_local {
 	struct completion tx_complete;
 
 	struct ieee802154_dev *dev;
+	struct regmap *regmap;
 
 	spinlock_t lock;
 	bool irq_busy;
@@ -256,6 +258,157 @@ static bool is_rf212(struct at86rf230_local *local)
 #define STATE_BUSY_RX_AACK_NOCLK 0x1E
 #define STATE_TRANSITION_IN_PROGRESS 0x1F
 
+#define AT86RF2XX_NUMREGS 0x3F
+
+static inline int
+__at86rf230_write(struct at86rf230_local *lp,
+		  unsigned int addr, unsigned int data)
+{
+	return regmap_write(lp->regmap, addr, data);
+}
+
+static inline int
+__at86rf230_read(struct at86rf230_local *lp,
+		 unsigned int addr, unsigned int *data)
+{
+	return regmap_read(lp->regmap, addr, data);
+}
+
+static inline int
+at86rf230_read_subreg(struct at86rf230_local *lp,
+		      unsigned int addr, unsigned int mask,
+		      unsigned int shift, unsigned int *data)
+{
+	int rc;
+
+	rc = __at86rf230_read(lp, addr, data);
+	if (rc > 0)
+		*data = (*data & mask) >> shift;
+
+	return rc;
+}
+
+static inline int
+at86rf230_write_subreg(struct at86rf230_local *lp,
+		       unsigned int addr, unsigned int mask,
+		       unsigned int shift, unsigned int data)
+{
+	return regmap_update_bits(lp->regmap, addr, mask, data << shift);
+}
+
+static bool
+at86rf230_reg_writeable(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case RG_TRX_STATE:
+	case RG_TRX_CTRL_0:
+	case RG_TRX_CTRL_1:
+	case RG_PHY_TX_PWR:
+	case RG_PHY_ED_LEVEL:
+	case RG_PHY_CC_CCA:
+	case RG_CCA_THRES:
+	case RG_RX_CTRL:
+	case RG_SFD_VALUE:
+	case RG_TRX_CTRL_2:
+	case RG_ANT_DIV:
+	case RG_IRQ_MASK:
+	case RG_VREG_CTRL:
+	case RG_BATMON:
+	case RG_XOSC_CTRL:
+	case RG_RX_SYN:
+	case RG_XAH_CTRL_1:
+	case RG_FTN_CTRL:
+	case RG_PLL_CF:
+	case RG_PLL_DCU:
+	case RG_SHORT_ADDR_0:
+	case RG_SHORT_ADDR_1:
+	case RG_PAN_ID_0:
+	case RG_PAN_ID_1:
+	case RG_IEEE_ADDR_0:
+	case RG_IEEE_ADDR_1:
+	case RG_IEEE_ADDR_2:
+	case RG_IEEE_ADDR_3:
+	case RG_IEEE_ADDR_4:
+	case RG_IEEE_ADDR_5:
+	case RG_IEEE_ADDR_6:
+	case RG_IEEE_ADDR_7:
+	case RG_XAH_CTRL_0:
+	case RG_CSMA_SEED_0:
+	case RG_CSMA_SEED_1:
+	case RG_CSMA_BE:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static bool
+at86rf230_reg_readable(struct device *dev, unsigned int reg)
+{
+	bool rc;
+
+	/* all writeable are also readable */
+	rc = at86rf230_reg_writeable(dev, reg);
+	if (rc)
+		return rc;
+
+	/* readonly regs */
+	switch (reg) {
+	case RG_TRX_STATUS:
+	case RG_PHY_RSSI:
+	case RG_IRQ_STATUS:
+	case RG_PART_NUM:
+	case RG_VERSION_NUM:
+	case RG_MAN_ID_1:
+	case RG_MAN_ID_0:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static bool
+at86rf230_reg_volatile(struct device *dev, unsigned int reg)
+{
+	/* can be changed during runtime */
+	switch (reg) {
+	case RG_TRX_STATUS:
+	case RG_TRX_STATE:
+	case RG_PHY_RSSI:
+	case RG_PHY_ED_LEVEL:
+	case RG_IRQ_STATUS:
+	case RG_VREG_CTRL:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static bool
+at86rf230_reg_precious(struct device *dev, unsigned int reg)
+{
+	/* don't clear irq line on read */
+	switch (reg) {
+	case RG_IRQ_STATUS:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static struct regmap_config at86rf230_regmap_spi_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.write_flag_mask = CMD_REG | CMD_WRITE,
+	.read_flag_mask = CMD_REG,
+	.cache_type = REGCACHE_RBTREE,
+	.max_register = AT86RF2XX_NUMREGS,
+	.writeable_reg = at86rf230_reg_writeable,
+	.readable_reg = at86rf230_reg_readable,
+	.volatile_reg = at86rf230_reg_volatile,
+	.precious_reg = at86rf230_reg_precious,
+};
+
 static int
 __at86rf230_detect_device(struct spi_device *spi, u16 *man_id, u8 *part,
 		u8 *version)
@@ -307,105 +460,6 @@ __at86rf230_detect_device(struct spi_device *spi, u16 *man_id, u8 *part,
 	return status;
 }
 
-static int
-__at86rf230_write(struct at86rf230_local *lp, u8 addr, u8 data)
-{
-	u8 *buf = lp->buf;
-	int status;
-	struct spi_message msg;
-	struct spi_transfer xfer = {
-		.len	= 2,
-		.tx_buf	= buf,
-	};
-
-	buf[0] = (addr & CMD_REG_MASK) | CMD_REG | CMD_WRITE;
-	buf[1] = data;
-	dev_vdbg(&lp->spi->dev, "buf[0] = %02x\n", buf[0]);
-	dev_vdbg(&lp->spi->dev, "buf[1] = %02x\n", buf[1]);
-	spi_message_init(&msg);
-	spi_message_add_tail(&xfer, &msg);
-
-	status = spi_sync(lp->spi, &msg);
-	dev_vdbg(&lp->spi->dev, "status = %d\n", status);
-	if (msg.status)
-		status = msg.status;
-
-	dev_vdbg(&lp->spi->dev, "status = %d\n", status);
-	dev_vdbg(&lp->spi->dev, "buf[0] = %02x\n", buf[0]);
-	dev_vdbg(&lp->spi->dev, "buf[1] = %02x\n", buf[1]);
-
-	return status;
-}
-
-static int
-__at86rf230_read_subreg(struct at86rf230_local *lp,
-			u8 addr, u8 mask, int shift, u8 *data)
-{
-	u8 *buf = lp->buf;
-	int status;
-	struct spi_message msg;
-	struct spi_transfer xfer = {
-		.len	= 2,
-		.tx_buf	= buf,
-		.rx_buf	= buf,
-	};
-
-	buf[0] = (addr & CMD_REG_MASK) | CMD_REG;
-	buf[1] = 0xff;
-	dev_vdbg(&lp->spi->dev, "buf[0] = %02x\n", buf[0]);
-	spi_message_init(&msg);
-	spi_message_add_tail(&xfer, &msg);
-
-	status = spi_sync(lp->spi, &msg);
-	dev_vdbg(&lp->spi->dev, "status = %d\n", status);
-	if (msg.status)
-		status = msg.status;
-
-	dev_vdbg(&lp->spi->dev, "status = %d\n", status);
-	dev_vdbg(&lp->spi->dev, "buf[0] = %02x\n", buf[0]);
-	dev_vdbg(&lp->spi->dev, "buf[1] = %02x\n", buf[1]);
-
-	if (status == 0)
-		*data = (buf[1] & mask) >> shift;
-
-	return status;
-}
-
-static int
-at86rf230_read_subreg(struct at86rf230_local *lp,
-		      u8 addr, u8 mask, int shift, u8 *data)
-{
-	int status;
-
-	mutex_lock(&lp->bmux);
-	status = __at86rf230_read_subreg(lp, addr, mask, shift, data);
-	mutex_unlock(&lp->bmux);
-
-	return status;
-}
-
-static int
-at86rf230_write_subreg(struct at86rf230_local *lp,
-		       u8 addr, u8 mask, int shift, u8 data)
-{
-	int status;
-	u8 val;
-
-	mutex_lock(&lp->bmux);
-	status = __at86rf230_read_subreg(lp, addr, 0xff, 0, &val);
-	if (status)
-		goto out;
-
-	val &= ~mask;
-	val |= (data << shift) & mask;
-
-	status = __at86rf230_write(lp, addr, val);
-out:
-	mutex_unlock(&lp->bmux);
-
-	return status;
-}
-
 static int
 at86rf230_write_fbuf(struct at86rf230_local *lp, u8 *data, u8 len)
 {
@@ -520,7 +574,7 @@ at86rf230_state(struct ieee802154_dev *dev, int state)
 {
 	struct at86rf230_local *lp = dev->priv;
 	int rc;
-	u8 val;
+	unsigned int val;
 	u8 desired_status;
 
 	might_sleep();
@@ -890,12 +944,11 @@ static void at86rf230_irqwork(struct work_struct *work)
 {
 	struct at86rf230_local *lp =
 		container_of(work, struct at86rf230_local, irqwork);
-	u8 status = 0, val;
+	unsigned int status;
 	int rc;
 	unsigned long flags;
 
-	rc = at86rf230_read_subreg(lp, RG_IRQ_STATUS, 0xff, 0, &val);
-	status |= val;
+	rc = at86rf230_read_subreg(lp, RG_IRQ_STATUS, 0xff, 0, &status);
 
 	status &= ~IRQ_PLL_LOCK; /* ignore */
 	status &= ~IRQ_RX_START; /* ignore */
@@ -954,7 +1007,7 @@ static irqreturn_t at86rf230_isr_level(int irq, void *data)
 static int at86rf230_hw_init(struct at86rf230_local *lp)
 {
 	int rc, irq_pol, irq_type;
-	u8 dvdd;
+	unsigned int dvdd;
 	u8 csma_seed[2];
 
 	rc = at86rf230_write_subreg(lp, SR_TRX_CMD, STATE_FORCE_TRX_OFF);
@@ -1033,7 +1086,8 @@ static int at86rf230_probe(struct spi_device *spi)
 	struct ieee802154_dev *dev;
 	struct at86rf230_local *lp;
 	u16 man_id = 0;
-	u8 part = 0, version = 0, status;
+	u8 part = 0, version = 0;
+	unsigned int status;
 	irq_handler_t irq_handler;
 	work_func_t irq_worker;
 	int rc, irq_type;
@@ -1128,6 +1182,14 @@ static int at86rf230_probe(struct spi_device *spi)
 	if (rc < 0)
 		goto free_dev;
 
+	lp->regmap = devm_regmap_init_spi(spi, &at86rf230_regmap_spi_config);
+	if (IS_ERR(lp->regmap)) {
+		rc = PTR_ERR(lp->regmap);
+		dev_err(&spi->dev, "Failed to allocate register map: %d\n",
+			rc);
+		goto free_dev;
+	}
+
 	irq_type = irq_get_trigger_type(spi->irq);
 	if (!irq_type)
 		irq_type = IRQF_TRIGGER_RISING;