net: Microchip encx24j600 driver

This ethernet driver supports the Micorchip enc424j600/626j600 Ethernet
controller over a SPI bus interface. This driver makes use of the regmap API to
optimize access to registers by caching registers where possible.

Datasheet:
http://ww1.microchip.com/downloads/en/DeviceDoc/39935b.pdfSigned-off-by: NJon Ringle <jringle@gridpoint.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/microchip/Kconfig

@@ -33,4 +33,13 @@ config ENC28J60_WRITEVERIFY
 	  Enable the verify after the buffer write useful for debugging purpose.
 	  If unsure, say N.
 
+config ENCX24J600
+    tristate "ENCX24J600 support"
+    depends on SPI
+    ---help---
+      Support for the Microchip ENC424J600 ethernet chip.
+
+      To compile this driver as a module, choose M here. The module will be
+      called enc424j600.
+
 endif # NET_VENDOR_MICROCHIP

drivers/net/ethernet/microchip/Makefile

@@ -3,3 +3,4 @@
 #
 
 obj-$(CONFIG_ENC28J60) += enc28j60.o
+obj-$(CONFIG_ENCX24J600) += encx24j600.o encx24j600-regmap.o

drivers/net/ethernet/microchip/encx24j600-regmap.c

+/**
+ * Register map access API - ENCX24J600 support
+ *
+ * Copyright 2015 Gridpoint
+ *
+ * Author: Jon Ringle <jringle@gridpoint.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#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 inline bool is_bits_set(int value, int mask)
+{
+	return (value & mask) == mask;
+}
+
+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);
+	else
+		/* 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_RBTREE,
+	.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_RBTREE,
+	.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,
+};
+
+void 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);
+	ctx->phymap = devm_regmap_init(dev, &phymap_encx24j600, ctx, &phycfg);
+}
+EXPORT_SYMBOL_GPL(devm_regmap_init_encx24j600);
+
+MODULE_LICENSE("GPL");

drivers/net/ethernet/microchip/encx24j600_hw.h

+/**
+ * encx24j600_hw.h: Register definitions
+ *
+ */
+
+#ifndef _ENCX24J600_HW_H
+#define _ENCX24J600_HW_H
+
+struct encx24j600_context {
+	struct spi_device *spi;
+	struct regmap *regmap;
+	struct regmap *phymap;
+	struct mutex mutex; /* mutex to protect access to regmap */
+	int bank;
+};
+
+void devm_regmap_init_encx24j600(struct device *dev,
+				 struct encx24j600_context *ctx);
+
+/* Single-byte instructions */
+#define BANK_SELECT(bank) (0xC0 | ((bank & (BANK_MASK >> BANK_SHIFT)) << 1))
+#define B0SEL 0xC0		/* Bank 0 Select */
+#define B1SEL 0xC2		/* Bank 1 Select */
+#define B2SEL 0xC4		/* Bank 2 Select */
+#define B3SEL 0xC6		/* Bank 3 Select */
+#define SETETHRST 0xCA		/* System Reset */
+#define FCDISABLE 0xE0		/* Flow Control Disable */
+#define FCSINGLE 0xE2		/* Flow Control Single */
+#define FCMULTIPLE 0xE4		/* Flow Control Multiple */
+#define FCCLEAR 0xE6		/* Flow Control Clear */
+#define SETPKTDEC 0xCC		/* Decrement Packet Counter */
+#define DMASTOP 0xD2		/* DMA Stop */
+#define DMACKSUM 0xD8		/* DMA Start Checksum */
+#define DMACKSUMS 0xDA		/* DMA Start Checksum with Seed */
+#define DMACOPY 0xDC		/* DMA Start Copy */
+#define DMACOPYS 0xDE		/* DMA Start Copy and Checksum with Seed */
+#define SETTXRTS 0xD4		/* Request Packet Transmission */
+#define ENABLERX 0xE8		/* Enable RX */
+#define DISABLERX 0xEA		/* Disable RX */
+#define SETEIE 0xEC		/* Enable Interrupts */
+#define CLREIE 0xEE		/* Disable Interrupts */
+
+/* Two byte instructions */
+#define RBSEL 0xC8		/* Read Bank Select */
+
+/* Three byte instructions */
+#define WGPRDPT 0x60		/* Write EGPRDPT */
+#define RGPRDPT 0x62		/* Read EGPRDPT */
+#define WRXRDPT 0x64		/* Write ERXRDPT */
+#define RRXRDPT 0x66		/* Read ERXRDPT */
+#define WUDARDPT 0x68		/* Write EUDARDPT */
+#define RUDARDPT 0x6A		/* Read EUDARDPT */
+#define WGPWRPT 0x6C		/* Write EGPWRPT */
+#define RGPWRPT 0x6E		/* Read EGPWRPT */
+#define WRXWRPT 0x70		/* Write ERXWRPT */
+#define RRXWRPT 0x72		/* Read ERXWRPT */
+#define WUDAWRPT 0x74		/* Write EUDAWRPT */
+#define RUDAWRPT 0x76		/* Read EUDAWRPT */
+
+/* n byte instructions */
+#define RCRCODE 0x00
+#define WCRCODE 0x40
+#define BFSCODE 0x80
+#define BFCCODE 0xA0
+#define RCR(addr) (RCRCODE | (addr & ADDR_MASK)) /* Read Control Register */
+#define WCR(addr) (WCRCODE | (addr & ADDR_MASK)) /* Write Control Register */
+#define RCRU 0x20		/* Read Control Register Unbanked */
+#define WCRU 0x22		/* Write Control Register Unbanked */
+#define BFS(addr) (BFSCODE | (addr & ADDR_MASK)) /* Bit Field Set */
+#define BFC(addr) (BFCCODE | (addr & ADDR_MASK)) /* Bit Field Clear */
+#define BFSU 0x24		/* Bit Field Set Unbanked */
+#define BFCU 0x26		/* Bit Field Clear Unbanked */
+#define RGPDATA 0x28		/* Read EGPDATA */
+#define WGPDATA 0x2A		/* Write EGPDATA */
+#define RRXDATA 0x2C		/* Read ERXDATA */
+#define WRXDATA 0x2E		/* Write ERXDATA */
+#define RUDADATA 0x30		/* Read EUDADATA */
+#define WUDADATA 0x32		/* Write EUDADATA */
+
+#define SFR_REG_COUNT	0xA0
+
+/* ENC424J600 Control Registers
+ * Control register definitions are a combination of address
+ * and bank number
+ * - Register address (bits 0-4)
+ * - Bank number (bits 5-6)
+ */
+#define ADDR_MASK 0x1F
+#define BANK_MASK 0x60
+#define BANK_SHIFT 5
+
+/* All-bank registers */
+#define EUDAST 0x16
+#define EUDAND 0x18
+#define ESTAT 0x1A
+#define EIR 0x1C
+#define ECON1 0x1E
+
+/* Bank 0 registers */
+#define ETXST (0x00 | 0x00)
+#define ETXLEN (0x02 | 0x00)
+#define ERXST (0x04 | 0x00)
+#define ERXTAIL (0x06 | 0x00)
+#define ERXHEAD (0x08 | 0x00)
+#define EDMAST (0x0A | 0x00)
+#define EDMALEN (0x0C | 0x00)
+#define EDMADST (0x0E | 0x00)
+#define EDMACS (0x10 | 0x00)
+#define ETXSTAT (0x12 | 0x00)
+#define ETXWIRE (0x14 | 0x00)
+
+/* Bank 1 registers */
+#define EHT1 (0x00 | 0x20)
+#define EHT2 (0x02 | 0x20)
+#define EHT3 (0x04 | 0x20)
+#define EHT4 (0x06 | 0x20)
+#define EPMM1 (0x08 | 0x20)
+#define EPMM2 (0x0A | 0x20)
+#define EPMM3 (0x0C | 0x20)
+#define EPMM4 (0x0E | 0x20)
+#define EPMCS (0x10 | 0x20)
+#define EPMO (0x12 | 0x20)
+#define ERXFCON (0x14 | 0x20)
+
+/* Bank 2 registers */
+#define MACON1 (0x00 | 0x40)
+#define MACON2 (0x02 | 0x40)
+#define MABBIPG (0x04 | 0x40)
+#define MAIPG (0x06 | 0x40)
+#define MACLCON (0x08 | 0x40)
+#define MAMXFL (0x0A | 0x40)
+#define MICMD (0x12 | 0x40)
+#define MIREGADR (0x14 | 0x40)
+
+/* Bank 3 registers */
+#define MAADR3 (0x00 | 0x60)
+#define MAADR2 (0x02 | 0x60)
+#define MAADR1 (0x04 | 0x60)
+#define MIWR (0x06 | 0x60)
+#define MIRD (0x08 | 0x60)
+#define MISTAT (0x0A | 0x60)
+#define EPAUS (0x0C | 0x60)
+#define ECON2 (0x0E | 0x60)
+#define ERXWM (0x10 | 0x60)
+#define EIE (0x12 | 0x60)
+#define EIDLED (0x14 | 0x60)
+
+/* Unbanked registers */
+#define EGPDATA (0x00 | 0x80)
+#define ERXDATA (0x02 | 0x80)
+#define EUDADATA (0x04 | 0x80)
+#define EGPRDPT (0x06 | 0x80)
+#define EGPWRPT (0x08 | 0x80)
+#define ERXRDPT (0x0A | 0x80)
+#define ERXWRPT (0x0C | 0x80)
+#define EUDARDPT (0x0E | 0x80)
+#define EUDAWRPT (0x10 | 0x80)
+
+
+/* Register bit definitions */
+/* ESTAT */
+#define INT (1 << 15)
+#define FCIDLE (1 << 14)
+#define RXBUSY (1 << 13)
+#define CLKRDY (1 << 12)
+#define PHYDPX (1 << 10)
+#define PHYLNK (1 << 8)
+
+/* EIR */
+#define CRYPTEN (1 << 15)
+#define MODEXIF (1 << 14)
+#define HASHIF (1 << 13)
+#define AESIF (1 << 12)
+#define LINKIF (1 << 11)
+#define PKTIF (1 << 6)
+#define DMAIF (1 << 5)
+#define TXIF (1 << 3)
+#define TXABTIF (1 << 2)
+#define RXABTIF (1 << 1)
+#define PCFULIF (1 << 0)
+
+/* ECON1 */
+#define MODEXST (1 << 15)
+#define HASHEN (1 << 14)
+#define HASHOP (1 << 13)
+#define HASHLST (1 << 12)
+#define AESST (1 << 11)
+#define AESOP1 (1 << 10)
+#define AESOP0 (1 << 9)
+#define PKTDEC (1 << 8)
+#define FCOP1 (1 << 7)
+#define FCOP0 (1 << 6)
+#define DMAST (1 << 5)
+#define DMACPY (1 << 4)
+#define DMACSSD (1 << 3)
+#define DMANOCS (1 << 2)
+#define TXRTS (1 << 1)
+#define RXEN (1 << 0)
+
+/* ETXSTAT */
+#define LATECOL (1 << 10)
+#define MAXCOL (1 << 9)
+#define EXDEFER (1 << 8)
+#define ETXSTATL_DEFER (1 << 7)
+#define CRCBAD (1 << 4)
+#define COLCNT_MASK 0xF
+
+/* ERXFCON */
+#define HTEN (1 << 15)
+#define MPEN (1 << 14)
+#define NOTPM (1 << 12)
+#define PMEN3 (1 << 11)
+#define PMEN2 (1 << 10)
+#define PMEN1 (1 << 9)
+#define PMEN0 (1 << 8)
+#define CRCEEN (1 << 7)
+#define CRCEN (1 << 6)
+#define RUNTEEN (1 << 5)
+#define RUNTEN (1 << 4)
+#define UCEN (1 << 3)
+#define NOTMEEN (1 << 2)
+#define MCEN (1 << 1)
+#define BCEN (1 << 0)
+
+/* MACON1 */
+#define LOOPBK (1 << 4)
+#define RXPAUS (1 << 2)
+#define PASSALL (1 << 1)
+
+/* MACON2 */
+#define MACON2_DEFER (1 << 14)
+#define BPEN (1 << 13)
+#define NOBKOFF (1 << 12)
+#define PADCFG2 (1 << 7)
+#define PADCFG1 (1 << 6)
+#define PADCFG0 (1 << 5)
+#define TXCRCEN (1 << 4)
+#define PHDREN (1 << 3)
+#define HFRMEN (1 << 2)
+#define MACON2_RSV1 (1 << 1)
+#define FULDPX (1 << 0)
+
+/* MAIPG */
+/* value of the high byte is given by the reserved bits,
+ * value of the low byte is recomended setting of the
+ * IPG parameter.
+ */
+#define MAIPGH_VAL 0x0C
+#define MAIPGL_VAL 0x12
+
+/* MIREGADRH */
+#define MIREGADR_VAL (1 << 8)
+
+/* MIREGADRL */
+#define PHREG_MASK 0x1F
+
+/* MICMD */
+#define MIISCAN (1 << 1)
+#define MIIRD (1 << 0)
+
+/* MISTAT */
+#define NVALID (1 << 2)
+#define SCAN (1 << 1)
+#define BUSY (1 << 0)
+
+/* ECON2 */
+#define ETHEN (1 << 15)
+#define STRCH (1 << 14)
+#define TXMAC (1 << 13)
+#define SHA1MD5 (1 << 12)
+#define COCON3 (1 << 11)
+#define COCON2 (1 << 10)
+#define COCON1 (1 << 9)
+#define COCON0 (1 << 8)
+#define AUTOFC (1 << 7)
+#define TXRST (1 << 6)
+#define RXRST (1 << 5)
+#define ETHRST (1 << 4)
+#define MODLEN1 (1 << 3)
+#define MODLEN0 (1 << 2)
+#define AESLEN1 (1 << 1)
+#define AESLEN0 (1 << 0)
+
+/* EIE */
+#define INTIE (1 << 15)
+#define MODEXIE (1 << 14)
+#define HASHIE (1 << 13)
+#define AESIE (1 << 12)
+#define LINKIE (1 << 11)
+#define PKTIE (1 << 6)
+#define DMAIE (1 << 5)
+#define TXIE (1 << 3)
+#define TXABTIE (1 << 2)
+#define RXABTIE (1 << 1)
+#define PCFULIE (1 << 0)
+
+/* EIDLED */
+#define LACFG3 (1 << 15)
+#define LACFG2 (1 << 14)
+#define LACFG1 (1 << 13)
+#define LACFG0 (1 << 12)
+#define LBCFG3 (1 << 11)
+#define LBCFG2 (1 << 10)
+#define LBCFG1 (1 << 9)
+#define LBCFG0 (1 << 8)
+#define DEVID_SHIFT 5
+#define DEVID_MASK (0x7 << DEVID_SHIFT)
+#define REVID_SHIFT 0
+#define REVID_MASK (0x1F << REVID_SHIFT)
+
+/* PHY registers */
+#define PHCON1 0x00
+#define PHSTAT1 0x01
+#define PHANA 0x04
+#define PHANLPA 0x05
+#define PHANE 0x06
+#define PHCON2 0x11
+#define PHSTAT2 0x1B
+#define PHSTAT3 0x1F
+
+/* PHCON1 */
+#define PRST (1 << 15)
+#define PLOOPBK (1 << 14)
+#define SPD100 (1 << 13)
+#define ANEN (1 << 12)
+#define PSLEEP (1 << 11)
+#define RENEG (1 << 9)
+#define PFULDPX (1 << 8)
+
+/* PHSTAT1 */
+#define FULL100 (1 << 14)
+#define HALF100 (1 << 13)
+#define FULL10 (1 << 12)
+#define HALF10 (1 << 11)
+#define ANDONE (1 << 5)
+#define LRFAULT (1 << 4)
+#define ANABLE (1 << 3)
+#define LLSTAT (1 << 2)
+#define EXTREGS (1 << 0)
+
+/* PHSTAT2 */
+#define PLRITY (1 << 4)
+
+/* PHSTAT3 */
+#define PHY3SPD100 (1 << 3)
+#define PHY3DPX (1 << 4)
+#define SPDDPX_SHIFT 2
+#define SPDDPX_MASK (0x7 << SPDDPX_SHIFT)
+
+/* PHANA */
+/* Default value for PHY initialization*/
+#define PHANA_DEFAULT 0x05E1
+
+/* PHANE */
+#define PDFLT (1 << 4)
+#define LPARCD (1 << 1)
+#define LPANABL (1 << 0)
+
+#define EUDAST_TEST_VAL 0x1234
+
+#define TSV_SIZE 7
+
+#define ENCX24J600_DEV_ID 0x1
+
+/* Configuration */
+
+/* Led is on when the link is present and driven low
+ * temporarily when packet is TX'd or RX'd
+ */
+#define LED_A_SETTINGS 0xC
+
+/* Led is on if the link is in 100 Mbps mode */
+#define LED_B_SETTINGS 0x8
+
+/* maximum ethernet frame length
+ * Currently not used as a limit anywhere
+ * (we're using the "huge frame enable" feature of
+ * enc424j600).
+ */
+#define MAX_FRAMELEN 1518
+
+/* Size in bytes of the receive buffer in enc424j600.
+ * Must be word aligned (even).
+ */
+#define RX_BUFFER_SIZE (15 * MAX_FRAMELEN)
+
+/* Start of the general purpose area in sram */
+#define SRAM_GP_START 0x0
+
+/* SRAM size */
+#define SRAM_SIZE 0x6000
+
+/* Start of the receive buffer */
+#define ERXST_VAL (SRAM_SIZE - RX_BUFFER_SIZE)
+
+#define RSV_RXLONGEVDROPEV	16
+#define RSV_CARRIEREV		18
+#define RSV_CRCERROR		20
+#define RSV_LENCHECKERR		21
+#define RSV_LENOUTOFRANGE	22
+#define RSV_RXOK		23
+#define RSV_RXMULTICAST		24
+#define RSV_RXBROADCAST		25
+#define RSV_DRIBBLENIBBLE	26
+#define RSV_RXCONTROLFRAME	27
+#define RSV_RXPAUSEFRAME	28
+#define RSV_RXUNKNOWNOPCODE	29
+#define RSV_RXTYPEVLAN		30
+
+#define RSV_RUNTFILTERMATCH	31
+#define RSV_NOTMEFILTERMATCH	32
+#define RSV_HASHFILTERMATCH	33
+#define RSV_MAGICPKTFILTERMATCH	34
+#define RSV_PTRNMTCHFILTERMATCH	35
+#define RSV_UNICASTFILTERMATCH	36
+
+#define RSV_SIZE		8
+#define RSV_BITMASK(x)		(1 << ((x) - 16))
+#define RSV_GETBIT(x, y)	(((x) & RSV_BITMASK(y)) ? 1 : 0)
+
+struct rsv {
+	u16 next_packet;
+	u16 len;
+	u32 rxstat;
+};
+
+/* Put RX buffer at 0 as suggested by the Errata datasheet */
+
+#define RXSTART_INIT		ERXST_VAL
+#define RXEND_INIT		0x5FFF
+
+int regmap_encx24j600_spi_write(void *context, u8 reg, const u8 *data,
+				size_t count);
+int regmap_encx24j600_spi_read(void *context, u8 reg, u8 *data, size_t count);
+
+
+#endif