diff options
Diffstat (limited to 'drivers/thunderbolt/eeprom.c')
| -rw-r--r-- | drivers/thunderbolt/eeprom.c | 51 |
1 files changed, 50 insertions, 1 deletions
diff --git a/drivers/thunderbolt/eeprom.c b/drivers/thunderbolt/eeprom.c index d40a5f07fc4c..996c6e29c8ad 100644 --- a/drivers/thunderbolt/eeprom.c +++ b/drivers/thunderbolt/eeprom.c @@ -429,6 +429,50 @@ err: return -EINVAL; } +static int tb_drom_copy_nvm(struct tb_switch *sw, u16 *size) +{ + u32 drom_offset; + int ret; + + if (!sw->dma_port) + return -ENODEV; + + ret = tb_sw_read(sw, &drom_offset, TB_CFG_SWITCH, + sw->cap_plug_events + 12, 1); + if (ret) + return ret; + + if (!drom_offset) + return -ENODEV; + + ret = dma_port_flash_read(sw->dma_port, drom_offset + 14, size, + sizeof(*size)); + if (ret) + return ret; + + /* Size includes CRC8 + UID + CRC32 */ + *size += 1 + 8 + 4; + sw->drom = kzalloc(*size, GFP_KERNEL); + if (!sw->drom) + return -ENOMEM; + + ret = dma_port_flash_read(sw->dma_port, drom_offset, sw->drom, *size); + if (ret) + goto err_free; + + /* + * Read UID from the minimal DROM because the one in NVM is just + * a placeholder. + */ + tb_drom_read_uid_only(sw, &sw->uid); + return 0; + +err_free: + kfree(sw->drom); + sw->drom = NULL; + return ret; +} + /** * tb_drom_read - copy drom to sw->drom and parse it */ @@ -450,6 +494,10 @@ int tb_drom_read(struct tb_switch *sw) if (tb_drom_copy_efi(sw, &size) == 0) goto parse; + /* Non-Apple hardware has the DROM as part of NVM */ + if (tb_drom_copy_nvm(sw, &size) == 0) + goto parse; + /* * The root switch contains only a dummy drom (header only, * no entries). Hardcode the configuration here. @@ -510,7 +558,8 @@ parse: header->uid_crc8, crc); goto err; } - sw->uid = header->uid; + if (!sw->uid) + sw->uid = header->uid; sw->vendor = header->vendor_id; sw->device = header->model_id; |