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linux-sg2042/drivers/net/ethernet/microchip/encx24j600-regmap.c

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/**
* 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);
/* 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");
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