/**
* tb_init_port() - initialize a port
*
* This is a helper method for tb_switch_alloc. Does not check or initialize
* any downstream switches.
*
* Return: Returns 0 on success or an error code on failure.
*/
static int tb_init_port(struct tb_port *port)
{
int res;
int cap;
res = tb_port_read(port, &port->config, TB_CFG_PORT, 0, 8);
if (res)
return res;
/* Port 0 is the switch itself and has no PHY. */
if (port->config.type == TB_TYPE_PORT && port->port != 0) {
cap = tb_find_cap(port, TB_CFG_PORT, TB_CAP_PHY);
if (cap > 0)
port->cap_phy = cap;
else
tb_port_WARN(port, "non switch port without a PHY\n");
}
tb_dump_port(port->sw->tb, &port->config);
/* TODO: Read dual link port, DP port and more from EEPROM. */
return 0;
}
static int tb_drom_parse_entry(struct tb_switch *sw,
struct tb_drom_entry_header *header)
{
struct tb_port *port;
int res;
enum tb_port_type type;
if (header->type != TB_DROM_ENTRY_PORT)
return 0;
port = &sw->ports[header->index];
port->disabled = header->port_disabled;
if (port->disabled)
return 0;
res = tb_port_read(port, &type, TB_CFG_PORT, 2, 1);
if (res)
return res;
type &= 0xffffff;
if (type == TB_TYPE_PORT) {
struct tb_drom_entry_port *entry = (void *) header;
if (header->len != sizeof(*entry)) {
tb_sw_warn(sw,
"port entry has size %#x (expected %#zx)\n",
header->len, sizeof(struct tb_drom_entry_port));
return -EIO;
}
tb_drom_parse_port_entry(port, entry);
}
return 0;
}
/**
* tb_port_state() - get connectedness state of a port
*
* The port must have a TB_CAP_PHY (i.e. it should be a real port).
*
* Return: Returns an enum tb_port_state on success or an error code on failure.
*/
static int tb_port_state(struct tb_port *port)
{
struct tb_cap_phy phy;
int res;
if (port->cap_phy == 0) {
tb_port_WARN(port, "does not have a PHY\n");
return -EINVAL;
}
res = tb_port_read(port, &phy, TB_CFG_PORT, port->cap_phy, 2);
if (res)
return res;
return phy.state;
}
