From 855b193290e6a07b343ee3c059ea6b4bd6cdc2bf Mon Sep 17 00:00:00 2001 From: Vivien Didelot Date: Wed, 20 Jul 2016 18:18:35 -0400 Subject: [PATCH] net: dsa: mv88e6xxx: rework EEPROM access The 6352 family of switches and compatibles provide a 8-bit address and 16-bit data access to an optional EEPROM. Newer chip such as the 6390 family slightly changed the access to 16-bit address and 8-bit data. This commit cleans up the EEPROM access code for 16-bit access and makes it easy to eventually introduce future support for 8-bit access. Here's a list of notable changes brought by this patch: - provide Global2 unlocked helpers for EEPROM commands - remove eeprom_mutex, only reg_lock is necessary for driver functions - eeprom_len is 0 for chip without EEPROM, so return it directly - the Running bit must be 0 before r/w, so wait for Busy *and* Running - remove now unused mv88e6xxx_wait and mv88e6xxx_reg_write - other than that, the logic (in _{get,set}_eeprom16) didn't change Chips with an 8-bit EEPROM access will require to implement the 8-suffixed variant of G2 helpers and the related flag: #define MV88E6XXX_FLAGS_EEPROM8 \ (MV88E6XXX_FLAG_G2_EEPROM_CMD | \ MV88E6XXX_FLAG_G2_EEPROM_ADDR) Signed-off-by: Vivien Didelot Reviewed-by: Andrew Lunn Signed-off-by: David S. Miller --- drivers/net/dsa/mv88e6xxx/chip.c | 483 ++++++++++++-------------- drivers/net/dsa/mv88e6xxx/mv88e6xxx.h | 39 +-- 2 files changed, 239 insertions(+), 283 deletions(-) diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c index 9ba21738569a..f95f1d49fdba 100644 --- a/drivers/net/dsa/mv88e6xxx/chip.c +++ b/drivers/net/dsa/mv88e6xxx/chip.c @@ -271,18 +271,6 @@ static int _mv88e6xxx_reg_write(struct mv88e6xxx_chip *chip, int addr, return mv88e6xxx_write(chip, addr, reg, val); } -static int mv88e6xxx_reg_write(struct mv88e6xxx_chip *chip, int addr, - int reg, u16 val) -{ - int ret; - - mutex_lock(&chip->reg_lock); - ret = _mv88e6xxx_reg_write(chip, addr, reg, val); - mutex_unlock(&chip->reg_lock); - - return ret; -} - static int mv88e6xxx_mdio_read_direct(struct mv88e6xxx_chip *chip, int addr, int regnum) { @@ -861,259 +849,12 @@ static int _mv88e6xxx_wait(struct mv88e6xxx_chip *chip, int reg, int offset, return -ETIMEDOUT; } -static int mv88e6xxx_wait(struct mv88e6xxx_chip *chip, int reg, - int offset, u16 mask) -{ - int ret; - - mutex_lock(&chip->reg_lock); - ret = _mv88e6xxx_wait(chip, reg, offset, mask); - mutex_unlock(&chip->reg_lock); - - return ret; -} - static int mv88e6xxx_mdio_wait(struct mv88e6xxx_chip *chip) { return _mv88e6xxx_wait(chip, REG_GLOBAL2, GLOBAL2_SMI_OP, GLOBAL2_SMI_OP_BUSY); } -static int mv88e6xxx_eeprom_load_wait(struct dsa_switch *ds) -{ - struct mv88e6xxx_chip *chip = ds_to_priv(ds); - - return mv88e6xxx_wait(chip, REG_GLOBAL2, GLOBAL2_EEPROM_OP, - GLOBAL2_EEPROM_OP_LOAD); -} - -static int mv88e6xxx_eeprom_busy_wait(struct dsa_switch *ds) -{ - struct mv88e6xxx_chip *chip = ds_to_priv(ds); - - return mv88e6xxx_wait(chip, REG_GLOBAL2, GLOBAL2_EEPROM_OP, - GLOBAL2_EEPROM_OP_BUSY); -} - -static int mv88e6xxx_read_eeprom_word(struct dsa_switch *ds, int addr) -{ - struct mv88e6xxx_chip *chip = ds_to_priv(ds); - int ret; - - mutex_lock(&chip->eeprom_mutex); - - ret = mv88e6xxx_reg_write(chip, REG_GLOBAL2, GLOBAL2_EEPROM_OP, - GLOBAL2_EEPROM_OP_READ | - (addr & GLOBAL2_EEPROM_OP_ADDR_MASK)); - if (ret < 0) - goto error; - - ret = mv88e6xxx_eeprom_busy_wait(ds); - if (ret < 0) - goto error; - - ret = mv88e6xxx_reg_read(chip, REG_GLOBAL2, GLOBAL2_EEPROM_DATA); -error: - mutex_unlock(&chip->eeprom_mutex); - return ret; -} - -static int mv88e6xxx_get_eeprom_len(struct dsa_switch *ds) -{ - struct mv88e6xxx_chip *chip = ds_to_priv(ds); - - if (mv88e6xxx_has(chip, MV88E6XXX_FLAG_EEPROM)) - return chip->eeprom_len; - - return 0; -} - -static int mv88e6xxx_get_eeprom(struct dsa_switch *ds, - struct ethtool_eeprom *eeprom, u8 *data) -{ - struct mv88e6xxx_chip *chip = ds_to_priv(ds); - int offset; - int len; - int ret; - - if (!mv88e6xxx_has(chip, MV88E6XXX_FLAG_EEPROM)) - return -EOPNOTSUPP; - - offset = eeprom->offset; - len = eeprom->len; - eeprom->len = 0; - - eeprom->magic = 0xc3ec4951; - - ret = mv88e6xxx_eeprom_load_wait(ds); - if (ret < 0) - return ret; - - if (offset & 1) { - int word; - - word = mv88e6xxx_read_eeprom_word(ds, offset >> 1); - if (word < 0) - return word; - - *data++ = (word >> 8) & 0xff; - - offset++; - len--; - eeprom->len++; - } - - while (len >= 2) { - int word; - - word = mv88e6xxx_read_eeprom_word(ds, offset >> 1); - if (word < 0) - return word; - - *data++ = word & 0xff; - *data++ = (word >> 8) & 0xff; - - offset += 2; - len -= 2; - eeprom->len += 2; - } - - if (len) { - int word; - - word = mv88e6xxx_read_eeprom_word(ds, offset >> 1); - if (word < 0) - return word; - - *data++ = word & 0xff; - - offset++; - len--; - eeprom->len++; - } - - return 0; -} - -static int mv88e6xxx_eeprom_is_readonly(struct dsa_switch *ds) -{ - struct mv88e6xxx_chip *chip = ds_to_priv(ds); - int ret; - - ret = mv88e6xxx_reg_read(chip, REG_GLOBAL2, GLOBAL2_EEPROM_OP); - if (ret < 0) - return ret; - - if (!(ret & GLOBAL2_EEPROM_OP_WRITE_EN)) - return -EROFS; - - return 0; -} - -static int mv88e6xxx_write_eeprom_word(struct dsa_switch *ds, int addr, - u16 data) -{ - struct mv88e6xxx_chip *chip = ds_to_priv(ds); - int ret; - - mutex_lock(&chip->eeprom_mutex); - - ret = mv88e6xxx_reg_write(chip, REG_GLOBAL2, GLOBAL2_EEPROM_DATA, data); - if (ret < 0) - goto error; - - ret = mv88e6xxx_reg_write(chip, REG_GLOBAL2, GLOBAL2_EEPROM_OP, - GLOBAL2_EEPROM_OP_WRITE | - (addr & GLOBAL2_EEPROM_OP_ADDR_MASK)); - if (ret < 0) - goto error; - - ret = mv88e6xxx_eeprom_busy_wait(ds); -error: - mutex_unlock(&chip->eeprom_mutex); - return ret; -} - -static int mv88e6xxx_set_eeprom(struct dsa_switch *ds, - struct ethtool_eeprom *eeprom, u8 *data) -{ - struct mv88e6xxx_chip *chip = ds_to_priv(ds); - int offset; - int ret; - int len; - - if (!mv88e6xxx_has(chip, MV88E6XXX_FLAG_EEPROM)) - return -EOPNOTSUPP; - - if (eeprom->magic != 0xc3ec4951) - return -EINVAL; - - ret = mv88e6xxx_eeprom_is_readonly(ds); - if (ret) - return ret; - - offset = eeprom->offset; - len = eeprom->len; - eeprom->len = 0; - - ret = mv88e6xxx_eeprom_load_wait(ds); - if (ret < 0) - return ret; - - if (offset & 1) { - int word; - - word = mv88e6xxx_read_eeprom_word(ds, offset >> 1); - if (word < 0) - return word; - - word = (*data++ << 8) | (word & 0xff); - - ret = mv88e6xxx_write_eeprom_word(ds, offset >> 1, word); - if (ret < 0) - return ret; - - offset++; - len--; - eeprom->len++; - } - - while (len >= 2) { - int word; - - word = *data++; - word |= *data++ << 8; - - ret = mv88e6xxx_write_eeprom_word(ds, offset >> 1, word); - if (ret < 0) - return ret; - - offset += 2; - len -= 2; - eeprom->len += 2; - } - - if (len) { - int word; - - word = mv88e6xxx_read_eeprom_word(ds, offset >> 1); - if (word < 0) - return word; - - word = (word & 0xff00) | *data++; - - ret = mv88e6xxx_write_eeprom_word(ds, offset >> 1, word); - if (ret < 0) - return ret; - - offset++; - len--; - eeprom->len++; - } - - return 0; -} - static int _mv88e6xxx_atu_wait(struct mv88e6xxx_chip *chip) { return _mv88e6xxx_wait(chip, REG_GLOBAL, GLOBAL_ATU_OP, @@ -3261,6 +3002,58 @@ static int mv88e6xxx_g2_clear_pot(struct mv88e6xxx_chip *chip) return err; } +static int mv88e6xxx_g2_eeprom_wait(struct mv88e6xxx_chip *chip) +{ + return _mv88e6xxx_wait(chip, REG_GLOBAL2, GLOBAL2_EEPROM_CMD, + GLOBAL2_EEPROM_CMD_BUSY | + GLOBAL2_EEPROM_CMD_RUNNING); +} + +static int mv88e6xxx_g2_eeprom_cmd(struct mv88e6xxx_chip *chip, u16 cmd) +{ + int err; + + err = mv88e6xxx_write(chip, REG_GLOBAL2, GLOBAL2_EEPROM_CMD, cmd); + if (err) + return err; + + return mv88e6xxx_g2_eeprom_wait(chip); +} + +static int mv88e6xxx_g2_eeprom_read16(struct mv88e6xxx_chip *chip, + u8 addr, u16 *data) +{ + u16 cmd = GLOBAL2_EEPROM_CMD_OP_READ | addr; + int err; + + err = mv88e6xxx_g2_eeprom_wait(chip); + if (err) + return err; + + err = mv88e6xxx_g2_eeprom_cmd(chip, cmd); + if (err) + return err; + + return mv88e6xxx_read(chip, REG_GLOBAL2, GLOBAL2_EEPROM_DATA, data); +} + +static int mv88e6xxx_g2_eeprom_write16(struct mv88e6xxx_chip *chip, + u8 addr, u16 data) +{ + u16 cmd = GLOBAL2_EEPROM_CMD_OP_WRITE | addr; + int err; + + err = mv88e6xxx_g2_eeprom_wait(chip); + if (err) + return err; + + err = mv88e6xxx_write(chip, REG_GLOBAL2, GLOBAL2_EEPROM_DATA, data); + if (err) + return err; + + return mv88e6xxx_g2_eeprom_cmd(chip, cmd); +} + static int mv88e6xxx_g2_setup(struct mv88e6xxx_chip *chip) { u16 reg; @@ -3345,9 +3138,6 @@ static int mv88e6xxx_setup(struct dsa_switch *ds) chip->ds = ds; ds->slave_mii_bus = chip->mdio_bus; - if (mv88e6xxx_has(chip, MV88E6XXX_FLAG_EEPROM)) - mutex_init(&chip->eeprom_mutex); - mutex_lock(&chip->reg_lock); err = mv88e6xxx_switch_reset(chip); @@ -3670,6 +3460,173 @@ static int mv88e6xxx_get_temp_alarm(struct dsa_switch *ds, bool *alarm) } #endif /* CONFIG_NET_DSA_HWMON */ +static int mv88e6xxx_get_eeprom_len(struct dsa_switch *ds) +{ + struct mv88e6xxx_chip *chip = ds_to_priv(ds); + + return chip->eeprom_len; +} + +static int mv88e6xxx_get_eeprom16(struct mv88e6xxx_chip *chip, + struct ethtool_eeprom *eeprom, u8 *data) +{ + unsigned int offset = eeprom->offset; + unsigned int len = eeprom->len; + u16 val; + int err; + + eeprom->len = 0; + + if (offset & 1) { + err = mv88e6xxx_g2_eeprom_read16(chip, offset >> 1, &val); + if (err) + return err; + + *data++ = (val >> 8) & 0xff; + + offset++; + len--; + eeprom->len++; + } + + while (len >= 2) { + err = mv88e6xxx_g2_eeprom_read16(chip, offset >> 1, &val); + if (err) + return err; + + *data++ = val & 0xff; + *data++ = (val >> 8) & 0xff; + + offset += 2; + len -= 2; + eeprom->len += 2; + } + + if (len) { + err = mv88e6xxx_g2_eeprom_read16(chip, offset >> 1, &val); + if (err) + return err; + + *data++ = val & 0xff; + + offset++; + len--; + eeprom->len++; + } + + return 0; +} + +static int mv88e6xxx_get_eeprom(struct dsa_switch *ds, + struct ethtool_eeprom *eeprom, u8 *data) +{ + struct mv88e6xxx_chip *chip = ds_to_priv(ds); + int err; + + mutex_lock(&chip->reg_lock); + + if (mv88e6xxx_has(chip, MV88E6XXX_FLAGS_EEPROM16)) + err = mv88e6xxx_get_eeprom16(chip, eeprom, data); + else + err = -EOPNOTSUPP; + + mutex_unlock(&chip->reg_lock); + + if (err) + return err; + + eeprom->magic = 0xc3ec4951; + + return 0; +} + +static int mv88e6xxx_set_eeprom16(struct mv88e6xxx_chip *chip, + struct ethtool_eeprom *eeprom, u8 *data) +{ + unsigned int offset = eeprom->offset; + unsigned int len = eeprom->len; + u16 val; + int err; + + /* Ensure the RO WriteEn bit is set */ + err = mv88e6xxx_read(chip, REG_GLOBAL2, GLOBAL2_EEPROM_CMD, &val); + if (err) + return err; + + if (!(val & GLOBAL2_EEPROM_CMD_WRITE_EN)) + return -EROFS; + + eeprom->len = 0; + + if (offset & 1) { + err = mv88e6xxx_g2_eeprom_read16(chip, offset >> 1, &val); + if (err) + return err; + + val = (*data++ << 8) | (val & 0xff); + + err = mv88e6xxx_g2_eeprom_write16(chip, offset >> 1, val); + if (err) + return err; + + offset++; + len--; + eeprom->len++; + } + + while (len >= 2) { + val = *data++; + val |= *data++ << 8; + + err = mv88e6xxx_g2_eeprom_write16(chip, offset >> 1, val); + if (err) + return err; + + offset += 2; + len -= 2; + eeprom->len += 2; + } + + if (len) { + err = mv88e6xxx_g2_eeprom_read16(chip, offset >> 1, &val); + if (err) + return err; + + val = (val & 0xff00) | *data++; + + err = mv88e6xxx_g2_eeprom_write16(chip, offset >> 1, val); + if (err) + return err; + + offset++; + len--; + eeprom->len++; + } + + return 0; +} + +static int mv88e6xxx_set_eeprom(struct dsa_switch *ds, + struct ethtool_eeprom *eeprom, u8 *data) +{ + struct mv88e6xxx_chip *chip = ds_to_priv(ds); + int err; + + if (eeprom->magic != 0xc3ec4951) + return -EINVAL; + + mutex_lock(&chip->reg_lock); + + if (mv88e6xxx_has(chip, MV88E6XXX_FLAGS_EEPROM16)) + err = mv88e6xxx_set_eeprom16(chip, eeprom, data); + else + err = -EOPNOTSUPP; + + mutex_unlock(&chip->reg_lock); + + return err; +} + static const struct mv88e6xxx_info mv88e6xxx_table[] = { [MV88E6085] = { .prod_num = PORT_SWITCH_ID_PROD_NUM_6085, @@ -4063,7 +4020,7 @@ static int mv88e6xxx_probe(struct mdio_device *mdiodev) if (IS_ERR(chip->reset)) return PTR_ERR(chip->reset); - if (mv88e6xxx_has(chip, MV88E6XXX_FLAG_EEPROM) && + if (mv88e6xxx_has(chip, MV88E6XXX_FLAGS_EEPROM16) && !of_property_read_u32(np, "eeprom-length", &eeprom_len)) chip->eeprom_len = eeprom_len; diff --git a/drivers/net/dsa/mv88e6xxx/mv88e6xxx.h b/drivers/net/dsa/mv88e6xxx/mv88e6xxx.h index 99de41fc90a6..48d6ea77f9bd 100644 --- a/drivers/net/dsa/mv88e6xxx/mv88e6xxx.h +++ b/drivers/net/dsa/mv88e6xxx/mv88e6xxx.h @@ -318,13 +318,14 @@ #define GLOBAL2_PRIO_OVERRIDE_SNOOP_SHIFT 4 #define GLOBAL2_PRIO_OVERRIDE_FORCE_ARP BIT(3) #define GLOBAL2_PRIO_OVERRIDE_ARP_SHIFT 0 -#define GLOBAL2_EEPROM_OP 0x14 -#define GLOBAL2_EEPROM_OP_BUSY BIT(15) -#define GLOBAL2_EEPROM_OP_WRITE ((3 << 12) | GLOBAL2_EEPROM_OP_BUSY) -#define GLOBAL2_EEPROM_OP_READ ((4 << 12) | GLOBAL2_EEPROM_OP_BUSY) -#define GLOBAL2_EEPROM_OP_LOAD BIT(11) -#define GLOBAL2_EEPROM_OP_WRITE_EN BIT(10) -#define GLOBAL2_EEPROM_OP_ADDR_MASK 0xff +#define GLOBAL2_EEPROM_CMD 0x14 +#define GLOBAL2_EEPROM_CMD_BUSY BIT(15) +#define GLOBAL2_EEPROM_CMD_OP_WRITE ((0x3 << 12) | GLOBAL2_EEPROM_CMD_BUSY) +#define GLOBAL2_EEPROM_CMD_OP_READ ((0x4 << 12) | GLOBAL2_EEPROM_CMD_BUSY) +#define GLOBAL2_EEPROM_CMD_OP_LOAD ((0x6 << 12) | GLOBAL2_EEPROM_CMD_BUSY) +#define GLOBAL2_EEPROM_CMD_RUNNING BIT(11) +#define GLOBAL2_EEPROM_CMD_WRITE_EN BIT(10) +#define GLOBAL2_EEPROM_CMD_ADDR_MASK 0xff #define GLOBAL2_EEPROM_DATA 0x15 #define GLOBAL2_PTP_AVB_OP 0x16 #define GLOBAL2_PTP_AVB_DATA 0x17 @@ -387,11 +388,6 @@ enum mv88e6xxx_cap { */ MV88E6XXX_CAP_EEE, - /* EEPROM Command and Data registers. - * See GLOBAL2_EEPROM_OP and GLOBAL2_EEPROM_DATA. - */ - MV88E6XXX_CAP_EEPROM, - /* Switch Global 2 Registers. * The device contains a second set of global 16-bit registers. */ @@ -404,6 +400,8 @@ enum mv88e6xxx_cap { MV88E6XXX_CAP_G2_PVT_DATA, /* (0x0c) Cross Chip Port VLAN Data */ MV88E6XXX_CAP_G2_SWITCH_MAC, /* (0x0d) Switch MAC/WoL/WoF */ MV88E6XXX_CAP_G2_POT, /* (0x0f) Priority Override Table */ + MV88E6XXX_CAP_G2_EEPROM_CMD, /* (0x14) EEPROM Command */ + MV88E6XXX_CAP_G2_EEPROM_DATA, /* (0x15) EEPROM Data */ /* Multi-chip Addressing Mode. * Some chips require an indirect SMI access when their SMI device @@ -443,7 +441,6 @@ enum mv88e6xxx_cap { /* Bitmask of capabilities */ #define MV88E6XXX_FLAG_EEE BIT(MV88E6XXX_CAP_EEE) -#define MV88E6XXX_FLAG_EEPROM BIT(MV88E6XXX_CAP_EEPROM) #define MV88E6XXX_FLAG_GLOBAL2 BIT(MV88E6XXX_CAP_GLOBAL2) #define MV88E6XXX_FLAG_G2_MGMT_EN_2X BIT(MV88E6XXX_CAP_G2_MGMT_EN_2X) #define MV88E6XXX_FLAG_G2_MGMT_EN_0X BIT(MV88E6XXX_CAP_G2_MGMT_EN_0X) @@ -453,6 +450,8 @@ enum mv88e6xxx_cap { #define MV88E6XXX_FLAG_G2_PVT_DATA BIT(MV88E6XXX_CAP_G2_PVT_DATA) #define MV88E6XXX_FLAG_G2_SWITCH_MAC BIT(MV88E6XXX_CAP_G2_SWITCH_MAC) #define MV88E6XXX_FLAG_G2_POT BIT(MV88E6XXX_CAP_G2_POT) +#define MV88E6XXX_FLAG_G2_EEPROM_CMD BIT(MV88E6XXX_CAP_G2_EEPROM_CMD) +#define MV88E6XXX_FLAG_G2_EEPROM_DATA BIT(MV88E6XXX_CAP_G2_EEPROM_DATA) #define MV88E6XXX_FLAG_MULTI_CHIP BIT(MV88E6XXX_CAP_MULTI_CHIP) #define MV88E6XXX_FLAG_PPU BIT(MV88E6XXX_CAP_PPU) #define MV88E6XXX_FLAG_PPU_ACTIVE BIT(MV88E6XXX_CAP_PPU_ACTIVE) @@ -462,6 +461,11 @@ enum mv88e6xxx_cap { #define MV88E6XXX_FLAG_TEMP_LIMIT BIT(MV88E6XXX_CAP_TEMP_LIMIT) #define MV88E6XXX_FLAG_VTU BIT(MV88E6XXX_CAP_VTU) +/* EEPROM Programming via Global2 with 16-bit data */ +#define MV88E6XXX_FLAGS_EEPROM16 \ + (MV88E6XXX_FLAG_G2_EEPROM_CMD | \ + MV88E6XXX_FLAG_G2_EEPROM_DATA) + /* Ingress Rate Limit unit */ #define MV88E6XXX_FLAGS_IRL \ (MV88E6XXX_FLAG_G2_IRL_CMD | \ @@ -513,7 +517,6 @@ enum mv88e6xxx_cap { #define MV88E6XXX_FLAGS_FAMILY_6320 \ (MV88E6XXX_FLAG_EEE | \ - MV88E6XXX_FLAG_EEPROM | \ MV88E6XXX_FLAG_GLOBAL2 | \ MV88E6XXX_FLAG_G2_MGMT_EN_2X | \ MV88E6XXX_FLAG_G2_MGMT_EN_0X | \ @@ -525,6 +528,7 @@ enum mv88e6xxx_cap { MV88E6XXX_FLAG_TEMP | \ MV88E6XXX_FLAG_TEMP_LIMIT | \ MV88E6XXX_FLAG_VTU | \ + MV88E6XXX_FLAGS_EEPROM16 | \ MV88E6XXX_FLAGS_IRL | \ MV88E6XXX_FLAGS_PVT) @@ -545,7 +549,6 @@ enum mv88e6xxx_cap { #define MV88E6XXX_FLAGS_FAMILY_6352 \ (MV88E6XXX_FLAG_EEE | \ - MV88E6XXX_FLAG_EEPROM | \ MV88E6XXX_FLAG_GLOBAL2 | \ MV88E6XXX_FLAG_G2_MGMT_EN_2X | \ MV88E6XXX_FLAG_G2_MGMT_EN_0X | \ @@ -558,6 +561,7 @@ enum mv88e6xxx_cap { MV88E6XXX_FLAG_TEMP | \ MV88E6XXX_FLAG_TEMP_LIMIT | \ MV88E6XXX_FLAG_VTU | \ + MV88E6XXX_FLAGS_EEPROM16 | \ MV88E6XXX_FLAGS_IRL | \ MV88E6XXX_FLAGS_PVT) @@ -629,11 +633,6 @@ struct mv88e6xxx_chip { */ struct mutex stats_mutex; - /* This mutex serializes eeprom access for chips with - * eeprom support. - */ - struct mutex eeprom_mutex; - struct mv88e6xxx_priv_port ports[DSA_MAX_PORTS]; /* A switch may have a GPIO line tied to its reset pin. Parse