drivers/net/ethernet/microchip/encx24j600-regmap.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Register map access API - ENCX24J600 support
  *
  * Copyright 2015 Gridpoint
  *
  * Author: Jon Ringle <jringle@gridpoint.com>
  */

 #include <linux/delay.h>
 #include <linux/errno.h>
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/netdevice.h>
 #include <linux/regmap.h>
 #include <linux/spi/spi.h>

 #include "encx24j600_hw.h"

 static int encx24j600_switch_bank(struct encx24j600_context *ctx,
 				  int bank)
 {
 	int ret = 0;
 	int bank_opcode = BANK_SELECT(bank);

 	ret = spi_write(ctx->spi, &bank_opcode, 1);
 	if (ret == 0)
 		ctx->bank = bank;

 	return ret;
 }

 static int encx24j600_cmdn(struct encx24j600_context *ctx, u8 opcode,
 			   const void *buf, size_t len)
 {
 	struct spi_message m;
 	struct spi_transfer t[2] = { { .tx_buf = &opcode, .len = 1, },
 				     { .tx_buf = buf, .len = len }, };
 	spi_message_init(&m);
 	spi_message_add_tail(&t[0], &m);
 	spi_message_add_tail(&t[1], &m);

 	return spi_sync(ctx->spi, &m);
 }

 static void regmap_lock_mutex(void *context)
 {
 	struct encx24j600_context *ctx = context;

 	mutex_lock(&ctx->mutex);
 }

 static void regmap_unlock_mutex(void *context)
 {
 	struct encx24j600_context *ctx = context;

 	mutex_unlock(&ctx->mutex);
 }

 static int regmap_encx24j600_sfr_read(void *context, u8 reg, u8 *val,
 				      size_t len)
 {
 	struct encx24j600_context *ctx = context;
 	u8 banked_reg = reg & ADDR_MASK;
 	u8 bank = ((reg & BANK_MASK) >> BANK_SHIFT);
 	u8 cmd = RCRU;
 	int ret = 0;
 	int i = 0;
 	u8 tx_buf[2];

 	if (reg < 0x80) {
 		cmd = RCRCODE | banked_reg;
 		if ((banked_reg < 0x16) && (ctx->bank != bank))
 			ret = encx24j600_switch_bank(ctx, bank);
 		if (unlikely(ret))
 			return ret;
 	} else {
 		/* Translate registers that are more effecient using
 		 * 3-byte SPI commands
 		 */
 		switch (reg) {
 		case EGPRDPT:
 			cmd = RGPRDPT; break;
 		case EGPWRPT:
 			cmd = RGPWRPT; break;
 		case ERXRDPT:
 			cmd = RRXRDPT; break;
 		case ERXWRPT:
 			cmd = RRXWRPT; break;
 		case EUDARDPT:
 			cmd = RUDARDPT; break;
 		case EUDAWRPT:
 			cmd = RUDAWRPT; break;
 		case EGPDATA:
 		case ERXDATA:
 		case EUDADATA:
 		default:
 			return -EINVAL;
 		}
 	}

 	tx_buf[i++] = cmd;
 	if (cmd == RCRU)
 		tx_buf[i++] = reg;

 	ret = spi_write_then_read(ctx->spi, tx_buf, i, val, len);

 	return ret;
 }

 static int regmap_encx24j600_sfr_update(struct encx24j600_context *ctx,
 					u8 reg, u8 *val, size_t len,
 					u8 unbanked_cmd, u8 banked_code)
 {
 	u8 banked_reg = reg & ADDR_MASK;
 	u8 bank = ((reg & BANK_MASK) >> BANK_SHIFT);
 	u8 cmd = unbanked_cmd;
 	struct spi_message m;
 	struct spi_transfer t[3] = { { .tx_buf = &cmd, .len = sizeof(cmd), },
 				     { .tx_buf = &reg, .len = sizeof(reg), },
 				     { .tx_buf = val, .len = len }, };

 	if (reg < 0x80) {
 		int ret = 0;

 		cmd = banked_code | banked_reg;
 		if ((banked_reg < 0x16) && (ctx->bank != bank))
 			ret = encx24j600_switch_bank(ctx, bank);
 		if (unlikely(ret))
 			return ret;
 	} else {
 		/* Translate registers that are more effecient using
 		 * 3-byte SPI commands
 		 */
 		switch (reg) {
 		case EGPRDPT:
 			cmd = WGPRDPT; break;
 		case EGPWRPT:
 			cmd = WGPWRPT; break;
 		case ERXRDPT:
 			cmd = WRXRDPT; break;
 		case ERXWRPT:
 			cmd = WRXWRPT; break;
 		case EUDARDPT:
 			cmd = WUDARDPT; break;
 		case EUDAWRPT:
 			cmd = WUDAWRPT; break;
 		case EGPDATA:
 		case ERXDATA:
 		case EUDADATA:
 		default:
 			return -EINVAL;
 		}
 	}

 	spi_message_init(&m);
 	spi_message_add_tail(&t[0], &m);

 	if (cmd == unbanked_cmd) {
 		t[1].tx_buf = &reg;
 		spi_message_add_tail(&t[1], &m);
 	}

 	spi_message_add_tail(&t[2], &m);
 	return spi_sync(ctx->spi, &m);
 }

 static int regmap_encx24j600_sfr_write(void *context, u8 reg, u8 *val,
 				       size_t len)
 {
 	struct encx24j600_context *ctx = context;

 	return regmap_encx24j600_sfr_update(ctx, reg, val, len, WCRU, WCRCODE);
 }

 static int regmap_encx24j600_sfr_set_bits(struct encx24j600_context *ctx,
 					  u8 reg, u8 val)
 {
 	return regmap_encx24j600_sfr_update(ctx, reg, &val, 1, BFSU, BFSCODE);
 }

 static int regmap_encx24j600_sfr_clr_bits(struct encx24j600_context *ctx,
 					  u8 reg, u8 val)
 {
 	return regmap_encx24j600_sfr_update(ctx, reg, &val, 1, BFCU, BFCCODE);
 }

 static int regmap_encx24j600_reg_update_bits(void *context, unsigned int reg,
 					     unsigned int mask,
 					     unsigned int val)
 {
 	struct encx24j600_context *ctx = context;

 	int ret = 0;
 	unsigned int set_mask = mask & val;
 	unsigned int clr_mask = mask & ~val;

 	if ((reg >= 0x40 && reg < 0x6c) || reg >= 0x80)
 		return -EINVAL;

 	if (set_mask & 0xff)
 		ret = regmap_encx24j600_sfr_set_bits(ctx, reg, set_mask);

 	set_mask = (set_mask & 0xff00) >> 8;

 	if ((set_mask & 0xff) && (ret == 0))
 		ret = regmap_encx24j600_sfr_set_bits(ctx, reg + 1, set_mask);

 	if ((clr_mask & 0xff) && (ret == 0))
 		ret = regmap_encx24j600_sfr_clr_bits(ctx, reg, clr_mask);

 	clr_mask = (clr_mask & 0xff00) >> 8;

 	if ((clr_mask & 0xff) && (ret == 0))
 		ret = regmap_encx24j600_sfr_clr_bits(ctx, reg + 1, clr_mask);

 	return ret;
 }

 int regmap_encx24j600_spi_write(void *context, u8 reg, const u8 *data,
 				size_t count)
 {
 	struct encx24j600_context *ctx = context;

 	if (reg < 0xc0)
 		return encx24j600_cmdn(ctx, reg, data, count);

 	/* SPI 1-byte command. Ignore data */
 	return spi_write(ctx->spi, &reg, 1);
 }
 EXPORT_SYMBOL_GPL(regmap_encx24j600_spi_write);

 int regmap_encx24j600_spi_read(void *context, u8 reg, u8 *data, size_t count)
 {
 	struct encx24j600_context *ctx = context;

 	if (reg == RBSEL && count > 1)
 		count = 1;

 	return spi_write_then_read(ctx->spi, &reg, sizeof(reg), data, count);
 }
 EXPORT_SYMBOL_GPL(regmap_encx24j600_spi_read);

 static int regmap_encx24j600_write(void *context, const void *data,
 				   size_t len)
 {
 	u8 *dout = (u8 *)data;
 	u8 reg = dout[0];
 	++dout;
 	--len;

 	if (reg > 0xa0)
 		return regmap_encx24j600_spi_write(context, reg, dout, len);

 	if (len > 2)
 		return -EINVAL;

 	return regmap_encx24j600_sfr_write(context, reg, dout, len);
 }

 static int regmap_encx24j600_read(void *context,
 				  const void *reg_buf, size_t reg_size,
 				  void *val, size_t val_size)
 {
 	u8 reg = *(const u8 *)reg_buf;

 	if (reg_size != 1) {
 		pr_err("%s: reg=%02x reg_size=%zu\n", __func__, reg, reg_size);
 		return -EINVAL;
 	}

 	if (reg > 0xa0)
 		return regmap_encx24j600_spi_read(context, reg, val, val_size);

 	if (val_size > 2) {
 		pr_err("%s: reg=%02x val_size=%zu\n", __func__, reg, val_size);
 		return -EINVAL;
 	}

 	return regmap_encx24j600_sfr_read(context, reg, val, val_size);
 }

 static bool encx24j600_regmap_readable(struct device *dev, unsigned int reg)
 {
 	if ((reg < 0x36) ||
 	    ((reg >= 0x40) && (reg < 0x4c)) ||
 	    ((reg >= 0x52) && (reg < 0x56)) ||
 	    ((reg >= 0x60) && (reg < 0x66)) ||
 	    ((reg >= 0x68) && (reg < 0x80)) ||
 	    ((reg >= 0x86) && (reg < 0x92)) ||
 	    (reg == 0xc8))
 		return true;
 	else
 		return false;
 }

 static bool encx24j600_regmap_writeable(struct device *dev, unsigned int reg)
 {
 	if ((reg < 0x12) ||
 	    ((reg >= 0x14) && (reg < 0x1a)) ||
 	    ((reg >= 0x1c) && (reg < 0x36)) ||
 	    ((reg >= 0x40) && (reg < 0x4c)) ||
 	    ((reg >= 0x52) && (reg < 0x56)) ||
 	    ((reg >= 0x60) && (reg < 0x68)) ||
 	    ((reg >= 0x6c) && (reg < 0x80)) ||
 	    ((reg >= 0x86) && (reg < 0x92)) ||
 	    ((reg >= 0xc0) && (reg < 0xc8)) ||
 	    ((reg >= 0xca) && (reg < 0xf0)))
 		return true;
 	else
 		return false;
 }

 static bool encx24j600_regmap_volatile(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case ERXHEAD:
 	case EDMACS:
 	case ETXSTAT:
 	case ETXWIRE:
 	case ECON1:	/* Can be modified via single byte cmds */
 	case ECON2:	/* Can be modified via single byte cmds */
 	case ESTAT:
 	case EIR:	/* Can be modified via single byte cmds */
 	case MIRD:
 	case MISTAT:
 		return true;
 	default:
 		break;
 	}

 	return false;
 }

 static bool encx24j600_regmap_precious(struct device *dev, unsigned int reg)
 {
 	/* single byte cmds are precious */
 	if (((reg >= 0xc0) && (reg < 0xc8)) ||
 	    ((reg >= 0xca) && (reg < 0xf0)))
 		return true;
 	else
 		return false;
 }

 static int regmap_encx24j600_phy_reg_read(void *context, unsigned int reg,
 					  unsigned int *val)
 {
 	struct encx24j600_context *ctx = context;
 	int ret;
 	unsigned int mistat;

 	reg = MIREGADR_VAL | (reg & PHREG_MASK);
 	ret = regmap_write(ctx->regmap, MIREGADR, reg);
 	if (unlikely(ret))
 		goto err_out;

 	ret = regmap_write(ctx->regmap, MICMD, MIIRD);
 	if (unlikely(ret))
 		goto err_out;

 	usleep_range(26, 100);
 	while (((ret = regmap_read(ctx->regmap, MISTAT, &mistat)) == 0) &&
 	       (mistat & BUSY))
 		cpu_relax();

 	if (unlikely(ret))
 		goto err_out;

 	ret = regmap_write(ctx->regmap, MICMD, 0);
 	if (unlikely(ret))
 		goto err_out;

 	ret = regmap_read(ctx->regmap, MIRD, val);

 err_out:
 	if (ret)
 		pr_err("%s: error %d reading reg %02x\n", __func__, ret,
 		       reg & PHREG_MASK);

 	return ret;
 }

 static int regmap_encx24j600_phy_reg_write(void *context, unsigned int reg,
 					   unsigned int val)
 {
 	struct encx24j600_context *ctx = context;
 	int ret;
 	unsigned int mistat;

 	reg = MIREGADR_VAL | (reg & PHREG_MASK);
 	ret = regmap_write(ctx->regmap, MIREGADR, reg);
 	if (unlikely(ret))
 		goto err_out;

 	ret = regmap_write(ctx->regmap, MIWR, val);
 	if (unlikely(ret))
 		goto err_out;

 	usleep_range(26, 100);
 	while (((ret = regmap_read(ctx->regmap, MISTAT, &mistat)) == 0) &&
 	       (mistat & BUSY))
 		cpu_relax();

 err_out:
 	if (ret)
 		pr_err("%s: error %d writing reg %02x=%04x\n", __func__, ret,
 		       reg & PHREG_MASK, val);

 	return ret;
 }

 static bool encx24j600_phymap_readable(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case PHCON1:
 	case PHSTAT1:
 	case PHANA:
 	case PHANLPA:
 	case PHANE:
 	case PHCON2:
 	case PHSTAT2:
 	case PHSTAT3:
 		return true;
 	default:
 		return false;
 	}
 }

 static bool encx24j600_phymap_writeable(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case PHCON1:
 	case PHCON2:
 	case PHANA:
 		return true;
 	case PHSTAT1:
 	case PHSTAT2:
 	case PHSTAT3:
 	case PHANLPA:
 	case PHANE:
 	default:
 		return false;
 	}
 }

 static bool encx24j600_phymap_volatile(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case PHSTAT1:
 	case PHSTAT2:
 	case PHSTAT3:
 	case PHANLPA:
 	case PHANE:
 	case PHCON2:
 		return true;
 	default:
 		return false;
 	}
 }

 static struct regmap_config regcfg = {
 	.name = "reg",
 	.reg_bits = 8,
 	.val_bits = 16,
 	.max_register = 0xee,
 	.reg_stride = 2,
 	.cache_type = REGCACHE_MAPLE,
 	.val_format_endian = REGMAP_ENDIAN_LITTLE,
 	.readable_reg = encx24j600_regmap_readable,
 	.writeable_reg = encx24j600_regmap_writeable,
 	.volatile_reg = encx24j600_regmap_volatile,
 	.precious_reg = encx24j600_regmap_precious,
 	.lock = regmap_lock_mutex,
 	.unlock = regmap_unlock_mutex,
 };

 static struct regmap_bus regmap_encx24j600 = {
 	.write = regmap_encx24j600_write,
 	.read = regmap_encx24j600_read,
 	.reg_update_bits = regmap_encx24j600_reg_update_bits,
 };

 static struct regmap_config phycfg = {
 	.name = "phy",
 	.reg_bits = 8,
 	.val_bits = 16,
 	.max_register = 0x1f,
 	.cache_type = REGCACHE_MAPLE,
 	.val_format_endian = REGMAP_ENDIAN_LITTLE,
 	.readable_reg = encx24j600_phymap_readable,
 	.writeable_reg = encx24j600_phymap_writeable,
 	.volatile_reg = encx24j600_phymap_volatile,
 };

 static struct regmap_bus phymap_encx24j600 = {
 	.reg_write = regmap_encx24j600_phy_reg_write,
 	.reg_read = regmap_encx24j600_phy_reg_read,
 };

 int devm_regmap_init_encx24j600(struct device *dev,
 				struct encx24j600_context *ctx)
 {
 	mutex_init(&ctx->mutex);
 	regcfg.lock_arg = ctx;
 	ctx->regmap = devm_regmap_init(dev, &regmap_encx24j600, ctx, &regcfg);
 	if (IS_ERR(ctx->regmap))
 		return PTR_ERR(ctx->regmap);
 	ctx->phymap = devm_regmap_init(dev, &phymap_encx24j600, ctx, &phycfg);
 	if (IS_ERR(ctx->phymap))
 		return PTR_ERR(ctx->phymap);

 	return 0;
 }
 EXPORT_SYMBOL_GPL(devm_regmap_init_encx24j600);

 MODULE_DESCRIPTION("Microchip ENCX24J600 helpers");
 MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* Register map access API - ENCX24J600 support
	*
	* Copyright 2015 Gridpoint
	*
	* Author: Jon Ringle <jringle@gridpoint.com>
	*/

	#include <linux/delay.h>
	#include <linux/errno.h>
	#include <linux/init.h>
	#include <linux/module.h>
	#include <linux/netdevice.h>
	#include <linux/regmap.h>
	#include <linux/spi/spi.h>

	#include "encx24j600_hw.h"

	static int encx24j600_switch_bank(struct encx24j600_context *ctx,
	int bank)
	{
	int ret = 0;
	int bank_opcode = BANK_SELECT(bank);

	ret = spi_write(ctx->spi, &bank_opcode, 1);
	if (ret == 0)
	ctx->bank = bank;

	return ret;
	}

	static int encx24j600_cmdn(struct encx24j600_context *ctx, u8 opcode,
	const void *buf, size_t len)
	{
	struct spi_message m;
	struct spi_transfer t[2] = { { .tx_buf = &opcode, .len = 1, },
	{ .tx_buf = buf, .len = len }, };
	spi_message_init(&m);
	spi_message_add_tail(&t[0], &m);
	spi_message_add_tail(&t[1], &m);

	return spi_sync(ctx->spi, &m);
	}

	static void regmap_lock_mutex(void *context)
	{
	struct encx24j600_context *ctx = context;

	mutex_lock(&ctx->mutex);
	}

	static void regmap_unlock_mutex(void *context)
	{
	struct encx24j600_context *ctx = context;

	mutex_unlock(&ctx->mutex);
	}

	static int regmap_encx24j600_sfr_read(void context, u8 reg, u8 val,
	size_t len)
	{
	struct encx24j600_context *ctx = context;
	u8 banked_reg = reg & ADDR_MASK;
	u8 bank = ((reg & BANK_MASK) >> BANK_SHIFT);
	u8 cmd = RCRU;
	int ret = 0;
	int i = 0;
	u8 tx_buf[2];

	if (reg < 0x80) {
	cmd = RCRCODE \| banked_reg;
	if ((banked_reg < 0x16) && (ctx->bank != bank))
	ret = encx24j600_switch_bank(ctx, bank);
	if (unlikely(ret))
	return ret;
	} else {
	/* Translate registers that are more effecient using
	* 3-byte SPI commands
	*/
	switch (reg) {
	case EGPRDPT:
	cmd = RGPRDPT; break;
	case EGPWRPT:
	cmd = RGPWRPT; break;
	case ERXRDPT:
	cmd = RRXRDPT; break;
	case ERXWRPT:
	cmd = RRXWRPT; break;
	case EUDARDPT:
	cmd = RUDARDPT; break;
	case EUDAWRPT:
	cmd = RUDAWRPT; break;
	case EGPDATA:
	case ERXDATA:
	case EUDADATA:
	default:
	return -EINVAL;
	}
	}

	tx_buf[i++] = cmd;
	if (cmd == RCRU)
	tx_buf[i++] = reg;

	ret = spi_write_then_read(ctx->spi, tx_buf, i, val, len);

	return ret;
	}

	static int regmap_encx24j600_sfr_update(struct encx24j600_context *ctx,
	u8 reg, u8 *val, size_t len,
	u8 unbanked_cmd, u8 banked_code)
	{
	u8 banked_reg = reg & ADDR_MASK;
	u8 bank = ((reg & BANK_MASK) >> BANK_SHIFT);
	u8 cmd = unbanked_cmd;
	struct spi_message m;
	struct spi_transfer t[3] = { { .tx_buf = &cmd, .len = sizeof(cmd), },
	{ .tx_buf = &reg, .len = sizeof(reg), },
	{ .tx_buf = val, .len = len }, };

	if (reg < 0x80) {
	int ret = 0;

	cmd = banked_code \| banked_reg;
	if ((banked_reg < 0x16) && (ctx->bank != bank))
	ret = encx24j600_switch_bank(ctx, bank);
	if (unlikely(ret))
	return ret;
	} else {
	/* Translate registers that are more effecient using
	* 3-byte SPI commands
	*/
	switch (reg) {
	case EGPRDPT:
	cmd = WGPRDPT; break;
	case EGPWRPT:
	cmd = WGPWRPT; break;
	case ERXRDPT:
	cmd = WRXRDPT; break;
	case ERXWRPT:
	cmd = WRXWRPT; break;
	case EUDARDPT:
	cmd = WUDARDPT; break;
	case EUDAWRPT:
	cmd = WUDAWRPT; break;
	case EGPDATA:
	case ERXDATA:
	case EUDADATA:
	default:
	return -EINVAL;
	}
	}

	spi_message_init(&m);
	spi_message_add_tail(&t[0], &m);

	if (cmd == unbanked_cmd) {
	t[1].tx_buf = ®
	spi_message_add_tail(&t[1], &m);
	}

	spi_message_add_tail(&t[2], &m);
	return spi_sync(ctx->spi, &m);
	}

	static int regmap_encx24j600_sfr_write(void context, u8 reg, u8 val,
	size_t len)
	{
	struct encx24j600_context *ctx = context;

	return regmap_encx24j600_sfr_update(ctx, reg, val, len, WCRU, WCRCODE);
	}

	static int regmap_encx24j600_sfr_set_bits(struct encx24j600_context *ctx,
	u8 reg, u8 val)
	{
	return regmap_encx24j600_sfr_update(ctx, reg, &val, 1, BFSU, BFSCODE);
	}

	static int regmap_encx24j600_sfr_clr_bits(struct encx24j600_context *ctx,
	u8 reg, u8 val)
	{
	return regmap_encx24j600_sfr_update(ctx, reg, &val, 1, BFCU, BFCCODE);
	}

	static int regmap_encx24j600_reg_update_bits(void *context, unsigned int reg,
	unsigned int mask,
	unsigned int val)
	{
	struct encx24j600_context *ctx = context;

	int ret = 0;
	unsigned int set_mask = mask & val;
	unsigned int clr_mask = mask & ~val;

	if ((reg >= 0x40 && reg < 0x6c) \|\| reg >= 0x80)
	return -EINVAL;

	if (set_mask & 0xff)
	ret = regmap_encx24j600_sfr_set_bits(ctx, reg, set_mask);

	set_mask = (set_mask & 0xff00) >> 8;

	if ((set_mask & 0xff) && (ret == 0))
	ret = regmap_encx24j600_sfr_set_bits(ctx, reg + 1, set_mask);

	if ((clr_mask & 0xff) && (ret == 0))
	ret = regmap_encx24j600_sfr_clr_bits(ctx, reg, clr_mask);

	clr_mask = (clr_mask & 0xff00) >> 8;

	if ((clr_mask & 0xff) && (ret == 0))
	ret = regmap_encx24j600_sfr_clr_bits(ctx, reg + 1, clr_mask);

	return ret;
	}

	int regmap_encx24j600_spi_write(void context, u8 reg, const u8 data,
	size_t count)
	{
	struct encx24j600_context *ctx = context;

	if (reg < 0xc0)
	return encx24j600_cmdn(ctx, reg, data, count);

	/* SPI 1-byte command. Ignore data */
	return spi_write(ctx->spi, &reg, 1);
	}
	EXPORT_SYMBOL_GPL(regmap_encx24j600_spi_write);

	int regmap_encx24j600_spi_read(void context, u8 reg, u8 data, size_t count)
	{
	struct encx24j600_context *ctx = context;

	if (reg == RBSEL && count > 1)
	count = 1;

	return spi_write_then_read(ctx->spi, &reg, sizeof(reg), data, count);
	}
	EXPORT_SYMBOL_GPL(regmap_encx24j600_spi_read);

	static int regmap_encx24j600_write(void context, const void data,
	size_t len)
	{
	u8 dout = (u8 )data;
	u8 reg = dout[0];
	++dout;
	--len;

	if (reg > 0xa0)
	return regmap_encx24j600_spi_write(context, reg, dout, len);

	if (len > 2)
	return -EINVAL;

	return regmap_encx24j600_sfr_write(context, reg, dout, len);
	}

	static int regmap_encx24j600_read(void *context,
	const void *reg_buf, size_t reg_size,
	void *val, size_t val_size)
	{
	u8 reg = (const u8 )reg_buf;

	if (reg_size != 1) {
	pr_err("%s: reg=%02x reg_size=%zu\n", __func__, reg, reg_size);
	return -EINVAL;
	}

	if (reg > 0xa0)
	return regmap_encx24j600_spi_read(context, reg, val, val_size);

	if (val_size > 2) {
	pr_err("%s: reg=%02x val_size=%zu\n", __func__, reg, val_size);
	return -EINVAL;
	}

	return regmap_encx24j600_sfr_read(context, reg, val, val_size);
	}

	static bool encx24j600_regmap_readable(struct device *dev, unsigned int reg)
	{
	if ((reg < 0x36) \|\|
	((reg >= 0x40) && (reg < 0x4c)) \|\|
	((reg >= 0x52) && (reg < 0x56)) \|\|
	((reg >= 0x60) && (reg < 0x66)) \|\|
	((reg >= 0x68) && (reg < 0x80)) \|\|
	((reg >= 0x86) && (reg < 0x92)) \|\|
	(reg == 0xc8))
	return true;
	else
	return false;
	}

	static bool encx24j600_regmap_writeable(struct device *dev, unsigned int reg)
	{
	if ((reg < 0x12) \|\|
	((reg >= 0x14) && (reg < 0x1a)) \|\|
	((reg >= 0x1c) && (reg < 0x36)) \|\|
	((reg >= 0x40) && (reg < 0x4c)) \|\|
	((reg >= 0x52) && (reg < 0x56)) \|\|
	((reg >= 0x60) && (reg < 0x68)) \|\|
	((reg >= 0x6c) && (reg < 0x80)) \|\|
	((reg >= 0x86) && (reg < 0x92)) \|\|
	((reg >= 0xc0) && (reg < 0xc8)) \|\|
	((reg >= 0xca) && (reg < 0xf0)))
	return true;
	else
	return false;
	}

	static bool encx24j600_regmap_volatile(struct device *dev, unsigned int reg)
	{
	switch (reg) {
	case ERXHEAD:
	case EDMACS:
	case ETXSTAT:
	case ETXWIRE:
	case ECON1: /* Can be modified via single byte cmds */
	case ECON2: /* Can be modified via single byte cmds */
	case ESTAT:
	case EIR: /* Can be modified via single byte cmds */
	case MIRD:
	case MISTAT:
	return true;
	default:
	break;
	}

	return false;
	}

	static bool encx24j600_regmap_precious(struct device *dev, unsigned int reg)
	{
	/* single byte cmds are precious */
	if (((reg >= 0xc0) && (reg < 0xc8)) \|\|
	((reg >= 0xca) && (reg < 0xf0)))
	return true;
	else
	return false;
	}

	static int regmap_encx24j600_phy_reg_read(void *context, unsigned int reg,
	unsigned int *val)
	{
	struct encx24j600_context *ctx = context;
	int ret;
	unsigned int mistat;

	reg = MIREGADR_VAL \| (reg & PHREG_MASK);
	ret = regmap_write(ctx->regmap, MIREGADR, reg);
	if (unlikely(ret))
	goto err_out;

	ret = regmap_write(ctx->regmap, MICMD, MIIRD);
	if (unlikely(ret))
	goto err_out;

	usleep_range(26, 100);
	while (((ret = regmap_read(ctx->regmap, MISTAT, &mistat)) == 0) &&
	(mistat & BUSY))
	cpu_relax();

	if (unlikely(ret))
	goto err_out;

	ret = regmap_write(ctx->regmap, MICMD, 0);
	if (unlikely(ret))
	goto err_out;

	ret = regmap_read(ctx->regmap, MIRD, val);

	err_out:
	if (ret)
	pr_err("%s: error %d reading reg %02x\n", __func__, ret,
	reg & PHREG_MASK);

	return ret;
	}

	static int regmap_encx24j600_phy_reg_write(void *context, unsigned int reg,
	unsigned int val)
	{
	struct encx24j600_context *ctx = context;
	int ret;
	unsigned int mistat;

	reg = MIREGADR_VAL \| (reg & PHREG_MASK);
	ret = regmap_write(ctx->regmap, MIREGADR, reg);
	if (unlikely(ret))
	goto err_out;

	ret = regmap_write(ctx->regmap, MIWR, val);
	if (unlikely(ret))
	goto err_out;

	usleep_range(26, 100);
	while (((ret = regmap_read(ctx->regmap, MISTAT, &mistat)) == 0) &&
	(mistat & BUSY))
	cpu_relax();

	err_out:
	if (ret)
	pr_err("%s: error %d writing reg %02x=%04x\n", __func__, ret,
	reg & PHREG_MASK, val);

	return ret;
	}

	static bool encx24j600_phymap_readable(struct device *dev, unsigned int reg)
	{
	switch (reg) {
	case PHCON1:
	case PHSTAT1:
	case PHANA:
	case PHANLPA:
	case PHANE:
	case PHCON2:
	case PHSTAT2:
	case PHSTAT3:
	return true;
	default:
	return false;
	}
	}

	static bool encx24j600_phymap_writeable(struct device *dev, unsigned int reg)
	{
	switch (reg) {
	case PHCON1:
	case PHCON2:
	case PHANA:
	return true;
	case PHSTAT1:
	case PHSTAT2:
	case PHSTAT3:
	case PHANLPA:
	case PHANE:
	default:
	return false;
	}
	}

	static bool encx24j600_phymap_volatile(struct device *dev, unsigned int reg)
	{
	switch (reg) {
	case PHSTAT1:
	case PHSTAT2:
	case PHSTAT3:
	case PHANLPA:
	case PHANE:
	case PHCON2:
	return true;
	default:
	return false;
	}
	}

	static struct regmap_config regcfg = {
	.name = "reg",
	.reg_bits = 8,
	.val_bits = 16,
	.max_register = 0xee,
	.reg_stride = 2,
	.cache_type = REGCACHE_MAPLE,
	.val_format_endian = REGMAP_ENDIAN_LITTLE,
	.readable_reg = encx24j600_regmap_readable,
	.writeable_reg = encx24j600_regmap_writeable,
	.volatile_reg = encx24j600_regmap_volatile,
	.precious_reg = encx24j600_regmap_precious,
	.lock = regmap_lock_mutex,
	.unlock = regmap_unlock_mutex,
	};

	static struct regmap_bus regmap_encx24j600 = {
	.write = regmap_encx24j600_write,
	.read = regmap_encx24j600_read,
	.reg_update_bits = regmap_encx24j600_reg_update_bits,
	};

	static struct regmap_config phycfg = {
	.name = "phy",
	.reg_bits = 8,
	.val_bits = 16,
	.max_register = 0x1f,
	.cache_type = REGCACHE_MAPLE,
	.val_format_endian = REGMAP_ENDIAN_LITTLE,
	.readable_reg = encx24j600_phymap_readable,
	.writeable_reg = encx24j600_phymap_writeable,
	.volatile_reg = encx24j600_phymap_volatile,
	};

	static struct regmap_bus phymap_encx24j600 = {
	.reg_write = regmap_encx24j600_phy_reg_write,
	.reg_read = regmap_encx24j600_phy_reg_read,
	};

	int devm_regmap_init_encx24j600(struct device *dev,
	struct encx24j600_context *ctx)
	{
	mutex_init(&ctx->mutex);
	regcfg.lock_arg = ctx;
	ctx->regmap = devm_regmap_init(dev, &regmap_encx24j600, ctx, &regcfg);
	if (IS_ERR(ctx->regmap))
	return PTR_ERR(ctx->regmap);
	ctx->phymap = devm_regmap_init(dev, &phymap_encx24j600, ctx, &phycfg);
	if (IS_ERR(ctx->phymap))
	return PTR_ERR(ctx->phymap);

	return 0;
	}
	EXPORT_SYMBOL_GPL(devm_regmap_init_encx24j600);

	MODULE_DESCRIPTION("Microchip ENCX24J600 helpers");
	MODULE_LICENSE("GPL");