508 lines
12 KiB
C
Executable File
508 lines
12 KiB
C
Executable File
/*
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* Thunderbolt Cactus Ridge driver - switch/port utility functions
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*
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* Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
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*/
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#include <linux/delay.h>
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#include <linux/slab.h>
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#include "tb.h"
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/* port utility functions */
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static const char *tb_port_type(struct tb_regs_port_header *port)
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{
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switch (port->type >> 16) {
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case 0:
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switch ((u8) port->type) {
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case 0:
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return "Inactive";
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case 1:
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return "Port";
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case 2:
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return "NHI";
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default:
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return "unknown";
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}
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case 0x2:
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return "Ethernet";
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case 0x8:
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return "SATA";
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case 0xe:
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return "DP/HDMI";
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case 0x10:
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return "PCIe";
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case 0x20:
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return "USB";
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default:
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return "unknown";
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}
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}
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static void tb_dump_port(struct tb *tb, struct tb_regs_port_header *port)
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{
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tb_info(tb,
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" Port %d: %x:%x (Revision: %d, TB Version: %d, Type: %s (%#x))\n",
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port->port_number, port->vendor_id, port->device_id,
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port->revision, port->thunderbolt_version, tb_port_type(port),
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port->type);
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tb_info(tb, " Max hop id (in/out): %d/%d\n",
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port->max_in_hop_id, port->max_out_hop_id);
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tb_info(tb, " Max counters: %d\n", port->max_counters);
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tb_info(tb, " NFC Credits: %#x\n", port->nfc_credits);
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}
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/**
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* tb_port_state() - get connectedness state of a port
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*
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* The port must have a TB_CAP_PHY (i.e. it should be a real port).
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*
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* Return: Returns an enum tb_port_state on success or an error code on failure.
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*/
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static int tb_port_state(struct tb_port *port)
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{
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struct tb_cap_phy phy;
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int res;
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if (port->cap_phy == 0) {
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tb_port_WARN(port, "does not have a PHY\n");
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return -EINVAL;
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}
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res = tb_port_read(port, &phy, TB_CFG_PORT, port->cap_phy, 2);
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if (res)
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return res;
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return phy.state;
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}
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/**
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* tb_wait_for_port() - wait for a port to become ready
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*
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* Wait up to 1 second for a port to reach state TB_PORT_UP. If
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* wait_if_unplugged is set then we also wait if the port is in state
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* TB_PORT_UNPLUGGED (it takes a while for the device to be registered after
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* switch resume). Otherwise we only wait if a device is registered but the link
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* has not yet been established.
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*
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* Return: Returns an error code on failure. Returns 0 if the port is not
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* connected or failed to reach state TB_PORT_UP within one second. Returns 1
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* if the port is connected and in state TB_PORT_UP.
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*/
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int tb_wait_for_port(struct tb_port *port, bool wait_if_unplugged)
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{
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int retries = 10;
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int state;
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if (!port->cap_phy) {
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tb_port_WARN(port, "does not have PHY\n");
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return -EINVAL;
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}
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if (tb_is_upstream_port(port)) {
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tb_port_WARN(port, "is the upstream port\n");
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return -EINVAL;
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}
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while (retries--) {
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state = tb_port_state(port);
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if (state < 0)
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return state;
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if (state == TB_PORT_DISABLED) {
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tb_port_info(port, "is disabled (state: 0)\n");
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return 0;
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}
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if (state == TB_PORT_UNPLUGGED) {
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if (wait_if_unplugged) {
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/* used during resume */
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tb_port_info(port,
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"is unplugged (state: 7), retrying...\n");
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msleep(100);
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continue;
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}
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tb_port_info(port, "is unplugged (state: 7)\n");
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return 0;
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}
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if (state == TB_PORT_UP) {
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tb_port_info(port,
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"is connected, link is up (state: 2)\n");
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return 1;
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}
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/*
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* After plug-in the state is TB_PORT_CONNECTING. Give it some
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* time.
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*/
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tb_port_info(port,
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"is connected, link is not up (state: %d), retrying...\n",
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state);
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msleep(100);
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}
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tb_port_warn(port,
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"failed to reach state TB_PORT_UP. Ignoring port...\n");
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return 0;
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}
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/**
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* tb_port_add_nfc_credits() - add/remove non flow controlled credits to port
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*
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* Change the number of NFC credits allocated to @port by @credits. To remove
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* NFC credits pass a negative amount of credits.
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*
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* Return: Returns 0 on success or an error code on failure.
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*/
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int tb_port_add_nfc_credits(struct tb_port *port, int credits)
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{
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if (credits == 0)
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return 0;
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tb_port_info(port,
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"adding %#x NFC credits (%#x -> %#x)",
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credits,
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port->config.nfc_credits,
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port->config.nfc_credits + credits);
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port->config.nfc_credits += credits;
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return tb_port_write(port, &port->config.nfc_credits,
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TB_CFG_PORT, 4, 1);
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}
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/**
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* tb_port_clear_counter() - clear a counter in TB_CFG_COUNTER
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*
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* Return: Returns 0 on success or an error code on failure.
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*/
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int tb_port_clear_counter(struct tb_port *port, int counter)
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{
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u32 zero[3] = { 0, 0, 0 };
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tb_port_info(port, "clearing counter %d\n", counter);
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return tb_port_write(port, zero, TB_CFG_COUNTERS, 3 * counter, 3);
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}
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/**
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* tb_init_port() - initialize a port
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*
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* This is a helper method for tb_switch_alloc. Does not check or initialize
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* any downstream switches.
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*
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* Return: Returns 0 on success or an error code on failure.
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*/
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static int tb_init_port(struct tb_port *port)
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{
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int res;
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int cap;
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res = tb_port_read(port, &port->config, TB_CFG_PORT, 0, 8);
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if (res)
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return res;
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/* Port 0 is the switch itself and has no PHY. */
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if (port->config.type == TB_TYPE_PORT && port->port != 0) {
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cap = tb_find_cap(port, TB_CFG_PORT, TB_CAP_PHY);
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if (cap > 0)
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port->cap_phy = cap;
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else
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tb_port_WARN(port, "non switch port without a PHY\n");
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}
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tb_dump_port(port->sw->tb, &port->config);
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/* TODO: Read dual link port, DP port and more from EEPROM. */
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return 0;
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}
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/* switch utility functions */
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static void tb_dump_switch(struct tb *tb, struct tb_regs_switch_header *sw)
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{
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tb_info(tb,
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" Switch: %x:%x (Revision: %d, TB Version: %d)\n",
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sw->vendor_id, sw->device_id, sw->revision,
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sw->thunderbolt_version);
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tb_info(tb, " Max Port Number: %d\n", sw->max_port_number);
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tb_info(tb, " Config:\n");
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tb_info(tb,
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" Upstream Port Number: %d Depth: %d Route String: %#llx Enabled: %d, PlugEventsDelay: %dms\n",
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sw->upstream_port_number, sw->depth,
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(((u64) sw->route_hi) << 32) | sw->route_lo,
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sw->enabled, sw->plug_events_delay);
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tb_info(tb,
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" unknown1: %#x unknown4: %#x\n",
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sw->__unknown1, sw->__unknown4);
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}
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/**
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* reset_switch() - reconfigure route, enable and send TB_CFG_PKG_RESET
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*
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* Return: Returns 0 on success or an error code on failure.
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*/
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int tb_switch_reset(struct tb *tb, u64 route)
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{
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struct tb_cfg_result res;
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struct tb_regs_switch_header header = {
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header.route_hi = route >> 32,
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header.route_lo = route,
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header.enabled = true,
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};
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tb_info(tb, "resetting switch at %llx\n", route);
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res.err = tb_cfg_write(tb->ctl, ((u32 *) &header) + 2, route,
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0, 2, 2, 2);
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if (res.err)
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return res.err;
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res = tb_cfg_reset(tb->ctl, route, TB_CFG_DEFAULT_TIMEOUT);
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if (res.err > 0)
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return -EIO;
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return res.err;
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}
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struct tb_switch *get_switch_at_route(struct tb_switch *sw, u64 route)
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{
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u8 next_port = route; /*
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* Routes use a stride of 8 bits,
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* eventhough a port index has 6 bits at most.
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* */
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if (route == 0)
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return sw;
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if (next_port > sw->config.max_port_number)
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return NULL;
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if (tb_is_upstream_port(&sw->ports[next_port]))
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return NULL;
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if (!sw->ports[next_port].remote)
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return NULL;
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return get_switch_at_route(sw->ports[next_port].remote->sw,
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route >> TB_ROUTE_SHIFT);
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}
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/**
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* tb_plug_events_active() - enable/disable plug events on a switch
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*
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* Also configures a sane plug_events_delay of 255ms.
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*
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* Return: Returns 0 on success or an error code on failure.
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*/
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static int tb_plug_events_active(struct tb_switch *sw, bool active)
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{
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u32 data;
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int res;
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sw->config.plug_events_delay = 0xff;
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res = tb_sw_write(sw, ((u32 *) &sw->config) + 4, TB_CFG_SWITCH, 4, 1);
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if (res)
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return res;
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res = tb_sw_read(sw, &data, TB_CFG_SWITCH, sw->cap_plug_events + 1, 1);
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if (res)
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return res;
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if (active) {
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data = data & 0xFFFFFF83;
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switch (sw->config.device_id) {
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case 0x1513:
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case 0x151a:
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case 0x1549:
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break;
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default:
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data |= 4;
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}
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} else {
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data = data | 0x7c;
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}
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return tb_sw_write(sw, &data, TB_CFG_SWITCH,
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sw->cap_plug_events + 1, 1);
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}
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/**
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* tb_switch_free() - free a tb_switch and all downstream switches
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*/
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void tb_switch_free(struct tb_switch *sw)
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{
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int i;
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/* port 0 is the switch itself and never has a remote */
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for (i = 1; i <= sw->config.max_port_number; i++) {
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if (tb_is_upstream_port(&sw->ports[i]))
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continue;
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if (sw->ports[i].remote)
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tb_switch_free(sw->ports[i].remote->sw);
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sw->ports[i].remote = NULL;
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}
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if (!sw->is_unplugged)
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tb_plug_events_active(sw, false);
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kfree(sw->ports);
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kfree(sw->drom);
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kfree(sw);
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}
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/**
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* tb_switch_alloc() - allocate and initialize a switch
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*
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* Return: Returns a NULL on failure.
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*/
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struct tb_switch *tb_switch_alloc(struct tb *tb, u64 route)
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{
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int i;
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int cap;
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struct tb_switch *sw;
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int upstream_port = tb_cfg_get_upstream_port(tb->ctl, route);
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if (upstream_port < 0)
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return NULL;
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sw = kzalloc(sizeof(*sw), GFP_KERNEL);
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if (!sw)
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return NULL;
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sw->tb = tb;
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if (tb_cfg_read(tb->ctl, &sw->config, route, 0, 2, 0, 5))
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goto err;
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tb_info(tb,
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"initializing Switch at %#llx (depth: %d, up port: %d)\n",
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route, tb_route_length(route), upstream_port);
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tb_info(tb, "old switch config:\n");
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tb_dump_switch(tb, &sw->config);
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/* configure switch */
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sw->config.upstream_port_number = upstream_port;
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sw->config.depth = tb_route_length(route);
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sw->config.route_lo = route;
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sw->config.route_hi = route >> 32;
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sw->config.enabled = 1;
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/* from here on we may use the tb_sw_* functions & macros */
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if (sw->config.vendor_id != 0x8086)
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tb_sw_warn(sw, "unknown switch vendor id %#x\n",
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sw->config.vendor_id);
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if (sw->config.device_id != 0x1547 && sw->config.device_id != 0x1549)
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tb_sw_warn(sw, "unsupported switch device id %#x\n",
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sw->config.device_id);
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/* upload configuration */
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if (tb_sw_write(sw, 1 + (u32 *) &sw->config, TB_CFG_SWITCH, 1, 3))
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goto err;
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/* initialize ports */
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sw->ports = kcalloc(sw->config.max_port_number + 1, sizeof(*sw->ports),
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GFP_KERNEL);
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if (!sw->ports)
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goto err;
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for (i = 0; i <= sw->config.max_port_number; i++) {
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/* minimum setup for tb_find_cap and tb_drom_read to work */
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sw->ports[i].sw = sw;
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sw->ports[i].port = i;
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}
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cap = tb_find_cap(&sw->ports[0], TB_CFG_SWITCH, TB_CAP_PLUG_EVENTS);
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if (cap < 0) {
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tb_sw_warn(sw, "cannot find TB_CAP_PLUG_EVENTS aborting\n");
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goto err;
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}
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sw->cap_plug_events = cap;
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/* read drom */
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if (tb_drom_read(sw))
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tb_sw_warn(sw, "tb_eeprom_read_rom failed, continuing\n");
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tb_sw_info(sw, "uid: %#llx\n", sw->uid);
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for (i = 0; i <= sw->config.max_port_number; i++) {
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if (sw->ports[i].disabled) {
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tb_port_info(&sw->ports[i], "disabled by eeprom\n");
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continue;
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}
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if (tb_init_port(&sw->ports[i]))
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goto err;
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}
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/* TODO: I2C, IECS, link controller */
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if (tb_plug_events_active(sw, true))
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goto err;
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return sw;
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err:
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kfree(sw->ports);
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kfree(sw->drom);
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kfree(sw);
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return NULL;
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}
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/**
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* tb_sw_set_unpplugged() - set is_unplugged on switch and downstream switches
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*/
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void tb_sw_set_unpplugged(struct tb_switch *sw)
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{
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int i;
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if (sw == sw->tb->root_switch) {
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tb_sw_WARN(sw, "cannot unplug root switch\n");
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return;
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}
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if (sw->is_unplugged) {
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tb_sw_WARN(sw, "is_unplugged already set\n");
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return;
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}
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sw->is_unplugged = true;
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for (i = 0; i <= sw->config.max_port_number; i++) {
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if (!tb_is_upstream_port(&sw->ports[i]) && sw->ports[i].remote)
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tb_sw_set_unpplugged(sw->ports[i].remote->sw);
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}
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}
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int tb_switch_resume(struct tb_switch *sw)
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{
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int i, err;
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u64 uid;
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tb_sw_info(sw, "resuming switch\n");
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err = tb_drom_read_uid_only(sw, &uid);
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if (err) {
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tb_sw_warn(sw, "uid read failed\n");
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return err;
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}
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if (sw->uid != uid) {
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tb_sw_info(sw,
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"changed while suspended (uid %#llx -> %#llx)\n",
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sw->uid, uid);
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return -ENODEV;
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}
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/* upload configuration */
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err = tb_sw_write(sw, 1 + (u32 *) &sw->config, TB_CFG_SWITCH, 1, 3);
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if (err)
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return err;
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err = tb_plug_events_active(sw, true);
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if (err)
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return err;
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/* check for surviving downstream switches */
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for (i = 1; i <= sw->config.max_port_number; i++) {
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struct tb_port *port = &sw->ports[i];
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if (tb_is_upstream_port(port))
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continue;
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if (!port->remote)
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continue;
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if (tb_wait_for_port(port, true) <= 0
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|| tb_switch_resume(port->remote->sw)) {
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tb_port_warn(port,
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"lost during suspend, disconnecting\n");
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tb_sw_set_unpplugged(port->remote->sw);
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}
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}
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return 0;
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}
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void tb_switch_suspend(struct tb_switch *sw)
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{
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int i, err;
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err = tb_plug_events_active(sw, false);
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if (err)
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return;
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for (i = 1; i <= sw->config.max_port_number; i++) {
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if (!tb_is_upstream_port(&sw->ports[i]) && sw->ports[i].remote)
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tb_switch_suspend(sw->ports[i].remote->sw);
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}
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/*
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* TODO: invoke tb_cfg_prepare_to_sleep here? does not seem to have any
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* effect?
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*/
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}
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