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/*
* Thunderbolt Cactus Ridge driver - switch/port utility functions
*
* Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
*/
#include <linux/delay.h>
#include "tb.h"
/* port utility functions */
static const char *tb_port_type(struct tb_regs_port_header *port)
{
switch (port->type >> 16) {
case 0:
switch ((u8) port->type) {
case 0:
return "Inactive";
case 1:
return "Port";
case 2:
return "NHI";
default:
return "unknown";
}
case 0x2:
return "Ethernet";
case 0x8:
return "SATA";
case 0xe:
return "DP/HDMI";
case 0x10:
return "PCIe";
case 0x20:
return "USB";
default:
return "unknown";
}
}
static void tb_dump_port(struct tb *tb, struct tb_regs_port_header *port)
{
tb_info(tb,
" Port %d: %x:%x (Revision: %d, TB Version: %d, Type: %s (%#x))\n",
port->port_number, port->vendor_id, port->device_id,
port->revision, port->thunderbolt_version, tb_port_type(port),
port->type);
tb_info(tb, " Max hop id (in/out): %d/%d\n",
port->max_in_hop_id, port->max_out_hop_id);
tb_info(tb, " Max counters: %d\n", port->max_counters);
tb_info(tb, " NFC Credits: %#x\n", port->nfc_credits);
}
/**
* 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_switch *sw, u8 port_nr)
{
int res;
struct tb_port *port = &sw->ports[port_nr];
port->sw = sw;
port->port = port_nr;
port->remote = NULL;
res = tb_port_read(port, &port->config, TB_CFG_PORT, 0, 8);
if (res)
return res;
tb_dump_port(sw->tb, &port->config);
/* TODO: Read dual link port, DP port and more from EEPROM. */
return 0;
}
/* switch utility functions */
static void tb_dump_switch(struct tb *tb, struct tb_regs_switch_header *sw)
{
tb_info(tb,
" Switch: %x:%x (Revision: %d, TB Version: %d)\n",
sw->vendor_id, sw->device_id, sw->revision,
sw->thunderbolt_version);
tb_info(tb, " Max Port Number: %d\n", sw->max_port_number);
tb_info(tb, " Config:\n");
tb_info(tb,
" Upstream Port Number: %d Depth: %d Route String: %#llx Enabled: %d, PlugEventsDelay: %dms\n",
sw->upstream_port_number, sw->depth,
(((u64) sw->route_hi) << 32) | sw->route_lo,
sw->enabled, sw->plug_events_delay);
tb_info(tb,
" unknown1: %#x unknown4: %#x\n",
sw->__unknown1, sw->__unknown4);
}
/**
* tb_plug_events_active() - enable/disable plug events on a switch
*
* Also configures a sane plug_events_delay of 255ms.
*
* Return: Returns 0 on success or an error code on failure.
*/
static int tb_plug_events_active(struct tb_switch *sw, bool active)
{
u32 data;
int res;
sw->config.plug_events_delay = 0xff;
res = tb_sw_write(sw, ((u32 *) &sw->config) + 4, TB_CFG_SWITCH, 4, 1);
if (res)
return res;
res = tb_sw_read(sw, &data, TB_CFG_SWITCH, sw->cap_plug_events + 1, 1);
if (res)
return res;
if (active) {
data = data & 0xFFFFFF83;
switch (sw->config.device_id) {
case 0x1513:
case 0x151a:
case 0x1549:
break;
default:
data |= 4;
}
} else {
data = data | 0x7c;
}
return tb_sw_write(sw, &data, TB_CFG_SWITCH,
sw->cap_plug_events + 1, 1);
}
/**
* tb_switch_free() - free a tb_switch and all downstream switches
*/
void tb_switch_free(struct tb_switch *sw)
{
int i;
/* port 0 is the switch itself and never has a remote */
for (i = 1; i <= sw->config.max_port_number; i++) {
if (tb_is_upstream_port(&sw->ports[i]))
continue;
if (sw->ports[i].remote)
tb_switch_free(sw->ports[i].remote->sw);
sw->ports[i].remote = NULL;
}
tb_plug_events_active(sw, false);
kfree(sw->ports);
kfree(sw);
}
/**
* tb_switch_alloc() - allocate and initialize a switch
*
* Return: Returns a NULL on failure.
*/
struct tb_switch *tb_switch_alloc(struct tb *tb, u64 route)
{
int i;
int cap;
struct tb_switch *sw;
int upstream_port = tb_cfg_get_upstream_port(tb->ctl, route);
if (upstream_port < 0)
return NULL;
sw = kzalloc(sizeof(*sw), GFP_KERNEL);
if (!sw)
return NULL;
sw->tb = tb;
if (tb_cfg_read(tb->ctl, &sw->config, route, 0, 2, 0, 5))
goto err;
tb_info(tb,
"initializing Switch at %#llx (depth: %d, up port: %d)\n",
route, tb_route_length(route), upstream_port);
tb_info(tb, "old switch config:\n");
tb_dump_switch(tb, &sw->config);
/* configure switch */
sw->config.upstream_port_number = upstream_port;
sw->config.depth = tb_route_length(route);
sw->config.route_lo = route;
sw->config.route_hi = route >> 32;
sw->config.enabled = 1;
/* from here on we may use the tb_sw_* functions & macros */
if (sw->config.vendor_id != 0x8086)
tb_sw_warn(sw, "unknown switch vendor id %#x\n",
sw->config.vendor_id);
if (sw->config.device_id != 0x1547 && sw->config.device_id != 0x1549)
tb_sw_warn(sw, "unsupported switch device id %#x\n",
sw->config.device_id);
/* upload configuration */
if (tb_sw_write(sw, 1 + (u32 *) &sw->config, TB_CFG_SWITCH, 1, 3))
goto err;
/* initialize ports */
sw->ports = kcalloc(sw->config.max_port_number + 1, sizeof(*sw->ports),
GFP_KERNEL);
if (!sw->ports)
goto err;
for (i = 0; i <= sw->config.max_port_number; i++) {
if (tb_init_port(sw, i))
goto err;
/* TODO: check if port is disabled (EEPROM) */
}
/* TODO: I2C, IECS, EEPROM, link controller */
cap = tb_find_cap(&sw->ports[0], TB_CFG_SWITCH, TB_CAP_PLUG_EVENTS);
if (cap < 0) {
tb_sw_warn(sw, "cannot find TB_CAP_PLUG_EVENTS aborting\n");
goto err;
}
sw->cap_plug_events = cap;
if (tb_plug_events_active(sw, true))
goto err;
return sw;
err:
kfree(sw->ports);
kfree(sw);
return NULL;
}
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