diff options
| -rw-r--r-- | drivers/net/phy/sfp.c | 82 |
1 files changed, 74 insertions, 8 deletions
diff --git a/drivers/net/phy/sfp.c b/drivers/net/phy/sfp.c index c88217af44a1..347c1e0e94d9 100644 --- a/drivers/net/phy/sfp.c +++ b/drivers/net/phy/sfp.c @@ -234,6 +234,7 @@ struct sfp { enum mdio_i2c_proto mdio_protocol; struct phy_device *mod_phy; const struct sff_data *type; + size_t i2c_max_block_size; size_t i2c_block_size; u32 max_power_mW; @@ -691,14 +692,71 @@ static int sfp_i2c_write(struct sfp *sfp, bool a2, u8 dev_addr, void *buf, return ret == ARRAY_SIZE(msgs) ? len : 0; } -static int sfp_i2c_configure(struct sfp *sfp, struct i2c_adapter *i2c) +static int sfp_smbus_byte_read(struct sfp *sfp, bool a2, u8 dev_addr, + void *buf, size_t len) { - if (!i2c_check_functionality(i2c, I2C_FUNC_I2C)) - return -EINVAL; + union i2c_smbus_data smbus_data; + u8 bus_addr = a2 ? 0x51 : 0x50; + u8 *data = buf; + int ret; + + while (len) { + ret = i2c_smbus_xfer(sfp->i2c, bus_addr, 0, + I2C_SMBUS_READ, dev_addr, + I2C_SMBUS_BYTE_DATA, &smbus_data); + if (ret < 0) + return ret; + + *data = smbus_data.byte; + + len--; + data++; + dev_addr++; + } + + return data - (u8 *)buf; +} + +static int sfp_smbus_byte_write(struct sfp *sfp, bool a2, u8 dev_addr, + void *buf, size_t len) +{ + union i2c_smbus_data smbus_data; + u8 bus_addr = a2 ? 0x51 : 0x50; + u8 *data = buf; + int ret; + while (len) { + smbus_data.byte = *data; + ret = i2c_smbus_xfer(sfp->i2c, bus_addr, 0, + I2C_SMBUS_WRITE, dev_addr, + I2C_SMBUS_BYTE_DATA, &smbus_data); + if (ret) + return ret; + + len--; + data++; + dev_addr++; + } + + return 0; +} + +static int sfp_i2c_configure(struct sfp *sfp, struct i2c_adapter *i2c) +{ sfp->i2c = i2c; - sfp->read = sfp_i2c_read; - sfp->write = sfp_i2c_write; + + if (i2c_check_functionality(i2c, I2C_FUNC_I2C)) { + sfp->read = sfp_i2c_read; + sfp->write = sfp_i2c_write; + sfp->i2c_max_block_size = SFP_EEPROM_BLOCK_SIZE; + } else if (i2c_check_functionality(i2c, I2C_FUNC_SMBUS_BYTE_DATA)) { + sfp->read = sfp_smbus_byte_read; + sfp->write = sfp_smbus_byte_write; + sfp->i2c_max_block_size = 1; + } else { + sfp->i2c = NULL; + return -EINVAL; + } return 0; } @@ -1594,7 +1652,7 @@ static void sfp_hwmon_probe(struct work_struct *work) */ if (sfp->i2c_block_size < 2) { dev_info(sfp->dev, - "skipping hwmon device registration due to broken EEPROM\n"); + "skipping hwmon device registration\n"); dev_info(sfp->dev, "diagnostic EEPROM area cannot be read atomically to guarantee data coherency\n"); return; @@ -2201,7 +2259,7 @@ static int sfp_sm_mod_probe(struct sfp *sfp, bool report) u8 check; int ret; - sfp->i2c_block_size = SFP_EEPROM_BLOCK_SIZE; + sfp->i2c_block_size = sfp->i2c_max_block_size; ret = sfp_read(sfp, false, 0, &id.base, sizeof(id.base)); if (ret < 0) { @@ -2941,7 +2999,6 @@ static struct sfp *sfp_alloc(struct device *dev) return ERR_PTR(-ENOMEM); sfp->dev = dev; - sfp->i2c_block_size = SFP_EEPROM_BLOCK_SIZE; mutex_init(&sfp->sm_mutex); mutex_init(&sfp->st_mutex); @@ -3115,6 +3172,15 @@ static int sfp_probe(struct platform_device *pdev) if (!sfp->sfp_bus) return -ENOMEM; + if (sfp->i2c_max_block_size < 2) + dev_warn(sfp->dev, + "Please note:\n" + "This SFP cage is accessed via an SMBus only capable of single byte\n" + "transactions. Some features are disabled, other may be unreliable or\n" + "sporadically fail. Use with caution. There is nothing that the kernel\n" + "or community can do to fix it, the kernel will try best efforts. Please\n" + "verify any problems on hardware that supports multi-byte I2C transactions.\n"); + sfp_debugfs_init(sfp); return 0; |