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thunderbolt: Read port configuration from eeprom.

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All Thunderbolt switches (except the root switch) contain a drom which
contains information about the device. Right now we only read the UID.

Add code to read and parse this drom. For now we are only interested in
which ports are disabled and which ports are "dual link ports" (a
physical thunderbolt port/socket contains two such ports).

Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andreas Noever
2014-06-12 23:11:46 +02:00
committed by Greg Kroah-Hartman
parent 23dd5bb49d
commit cd22e73bdf
3 changed files with 271 additions and 8 deletions
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4
drivers/thunderbolt/switch.c
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@@ -400,7 +400,7 @@ struct tb_switch *tb_switch_alloc(struct tb *tb, u64 route)
}
sw->cap_plug_events = cap;
if (tb_eeprom_read_uid(sw, &sw->uid))
if (tb_drom_read_uid_only(sw, &sw->uid))
tb_sw_warn(sw, "could not read uid from eeprom\n");
else
tb_sw_info(sw, "uid: %#llx\n", sw->uid);
@@ -442,7 +442,7 @@ int tb_switch_resume(struct tb_switch *sw)
u64 uid;
tb_sw_info(sw, "resuming switch\n");
err = tb_eeprom_read_uid(sw, &uid);
err = tb_drom_read_uid_only(sw, &uid);
if (err) {
tb_sw_warn(sw, "uid read failed\n");
return err;