Release 4.11 drivers/net/ethernet/microchip/encx24j600-regmap.c

Directory: drivers/net/ethernet/microchip
/**
 * 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;
}

Contributors
Person Tokens Prop Commits CommitProp
Jon Ringle 22 100.00% 1 100.00%
Total 22 100.00% 1 100.00%



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;
}

Contributors
Person Tokens Prop Commits CommitProp
Jon Ringle 56 100.00% 1 100.00%
Total 56 100.00% 1 100.00%



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);
}

Contributors
Person Tokens Prop Commits CommitProp
Jon Ringle 101 100.00% 1 100.00%
Total 101 100.00% 1 100.00%



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

	mutex_lock(&ctx->mutex);
}

Contributors
Person Tokens Prop Commits CommitProp
Jon Ringle 25 100.00% 1 100.00%
Total 25 100.00% 1 100.00%



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

	mutex_unlock(&ctx->mutex);
}

Contributors
Person Tokens Prop Commits CommitProp
Jon Ringle 25 100.00% 1 100.00%
Total 25 100.00% 1 100.00%



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;
}

Contributors
Person Tokens Prop Commits CommitProp
Jon Ringle 231 100.00% 1 100.00%
Total 231 100.00% 1 100.00%



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);
}

Contributors
Person Tokens Prop Commits CommitProp
Jon Ringle 306 100.00% 1 100.00%
Total 306 100.00% 1 100.00%



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);
}

Contributors
Person Tokens Prop Commits CommitProp
Jon Ringle 43 100.00% 1 100.00%
Total 43 100.00% 1 100.00%



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);
}

Contributors
Person Tokens Prop Commits CommitProp
Jon Ringle 34 100.00% 1 100.00%
Total 34 100.00% 1 100.00%



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);
}

Contributors
Person Tokens Prop Commits CommitProp
Jon Ringle 34 100.00% 1 100.00%
Total 34 100.00% 1 100.00%



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;
}

Contributors
Person Tokens Prop Commits CommitProp
Jon Ringle 190 100.00% 1 100.00%
Total 190 100.00% 1 100.00%



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);
}
Contributors
Person Tokens Prop Commits CommitProp
Jon Ringle 59 100.00% 1 100.00%
Total 59 100.00% 1 100.00%


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);
}
Contributors
Person Tokens Prop Commits CommitProp
Jon Ringle 60 100.00% 1 100.00%
Total 60 100.00% 1 100.00%


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);
}

Contributors
Person Tokens Prop Commits CommitProp
Jon Ringle 82 100.00% 1 100.00%
Total 82 100.00% 1 100.00%



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);
}

Contributors
Person Tokens Prop Commits CommitProp
Jon Ringle 112 100.00% 1 100.00%
Total 112 100.00% 1 100.00%



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;
}

Contributors
Person Tokens Prop Commits CommitProp
Jon Ringle 106 100.00% 1 100.00%
Total 106 100.00% 1 100.00%



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;
}

Contributors
Person Tokens Prop Commits CommitProp
Jon Ringle 156 100.00% 1 100.00%
Total 156 100.00% 1 100.00%



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;
}

Contributors
Person Tokens Prop Commits CommitProp
Jon Ringle 62 100.00% 1 100.00%
Total 62 100.00% 1 100.00%



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;
}

Contributors
Person Tokens Prop Commits CommitProp
Jon Ringle 53 100.00% 1 100.00%
Total 53 100.00% 1 100.00%



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;
}

Contributors
Person Tokens Prop Commits CommitProp
Jon Ringle 193 100.00% 1 100.00%
Total 193 100.00% 1 100.00%



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;
}

Contributors
Person Tokens Prop Commits CommitProp
Jon Ringle 148 100.00% 1 100.00%
Total 148 100.00% 1 100.00%



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;
	}
}

Contributors
Person Tokens Prop Commits CommitProp
Jon Ringle 52 100.00% 1 100.00%
Total 52 100.00% 1 100.00%



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;
	}
}

Contributors
Person Tokens Prop Commits CommitProp
Jon Ringle 52 100.00% 1 100.00%
Total 52 100.00% 1 100.00%



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;
	}
}

Contributors
Person Tokens Prop Commits CommitProp
Jon Ringle 46 100.00% 1 100.00%
Total 46 100.00% 1 100.00%


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);
}
Contributors
Person Tokens Prop Commits CommitProp
Jon Ringle 63 100.00% 1 100.00%
Total 63 100.00% 1 100.00%


EXPORT_SYMBOL_GPL(devm_regmap_init_encx24j600);

MODULE_LICENSE("GPL");
Overall Contributors
Person Tokens Prop Commits CommitProp
Jon Ringle 2519 100.00% 1 100.00%
Total 2519 100.00% 1 100.00%
Directory: drivers/net/ethernet/microchip

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.
Person	Tokens	Prop	Commits	CommitProp
Jon Ringle	22	100.00%	1	100.00%
Total	22	100.00%	1	100.00%
cregit-Linux how code gets into the kernel

Release 4.11 drivers/net/ethernet/microchip/encx24j600-regmap.c

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Overall Contributors
