/**
* tb_pci_port_active() - activate/deactivate PCI capability
*
* Return: Returns 0 on success or an error code on failure.
*/
static int tb_pci_port_active(struct tb_port *port, bool active)
{
u32 word = active ? 0x80000000 : 0x0;
int cap = tb_port_find_cap(port, TB_PORT_CAP_ADAP);
if (cap < 0) {
tb_port_warn(port, "TB_PORT_CAP_ADAP not found: %d\n", cap);
return cap;
}
return tb_port_write(port, &word, TB_CFG_PORT, cap, 1);
}
/**
* tb_port_add_nfc_credits() - add/remove non flow controlled credits to port
*
* Change the number of NFC credits allocated to @port by @credits. To remove
* NFC credits pass a negative amount of credits.
*
* Return: Returns 0 on success or an error code on failure.
*/
int tb_port_add_nfc_credits(struct tb_port *port, int credits)
{
if (credits == 0)
return 0;
tb_port_info(port,
"adding %#x NFC credits (%#x -> %#x)",
credits,
port->config.nfc_credits,
port->config.nfc_credits + credits);
port->config.nfc_credits += credits;
return tb_port_write(port, &port->config.nfc_credits,
TB_CFG_PORT, 4, 1);
}
/**
* tb_port_clear_counter() - clear a counter in TB_CFG_COUNTER
*
* Return: Returns 0 on success or an error code on failure.
*/
int tb_port_clear_counter(struct tb_port *port, int counter)
{
u32 zero[3] = { 0, 0, 0 };
tb_port_info(port, "clearing counter %d\n", counter);
return tb_port_write(port, zero, TB_CFG_COUNTERS, 3 * counter, 3);
}
