thunderbolt: Initialize root switch and ports
This patch adds the structures tb_switch and tb_port as well as code to initialize the root switch. 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
Greg Kroah-Hartman
parent
7adf60972c
commit
a25c8b2fc9
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@ -1,3 +1,3 @@
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obj-${CONFIG_THUNDERBOLT} := thunderbolt.o
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thunderbolt-objs := nhi.o ctl.o tb.o
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thunderbolt-objs := nhi.o ctl.o tb.o switch.o
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@ -0,0 +1,186 @@
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/*
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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 "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_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_switch *sw, u8 port_nr)
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{
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int res;
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struct tb_port *port = &sw->ports[port_nr];
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port->sw = sw;
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port->port = port_nr;
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port->remote = NULL;
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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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tb_dump_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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* 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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kfree(sw->ports);
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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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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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if (tb_init_port(sw, i))
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goto err;
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/* TODO: check if port is disabled (EEPROM) */
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}
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/* TODO: I2C, IECS, EEPROM, link controller */
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return sw;
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err:
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kfree(sw->ports);
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kfree(sw);
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return NULL;
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}
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@ -71,6 +71,10 @@ void thunderbolt_shutdown_and_free(struct tb *tb)
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{
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mutex_lock(&tb->lock);
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if (tb->root_switch)
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tb_switch_free(tb->root_switch);
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tb->root_switch = NULL;
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if (tb->ctl) {
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tb_ctl_stop(tb->ctl);
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tb_ctl_free(tb->ctl);
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@ -126,6 +130,10 @@ struct tb *thunderbolt_alloc_and_start(struct tb_nhi *nhi)
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*/
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tb_ctl_start(tb->ctl);
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tb->root_switch = tb_switch_alloc(tb, 0);
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if (!tb->root_switch)
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goto err_locked;
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/* Allow tb_handle_hotplug to progress events */
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tb->hotplug_active = true;
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mutex_unlock(&tb->lock);
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@ -7,8 +7,30 @@
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#ifndef TB_H_
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#define TB_H_
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#include <linux/pci.h>
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#include "tb_regs.h"
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#include "ctl.h"
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/**
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* struct tb_switch - a thunderbolt switch
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*/
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struct tb_switch {
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struct tb_regs_switch_header config;
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struct tb_port *ports;
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struct tb *tb;
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};
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/**
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* struct tb_port - a thunderbolt port, part of a tb_switch
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*/
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struct tb_port {
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struct tb_regs_port_header config;
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struct tb_switch *sw;
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struct tb_port *remote; /* remote port, NULL if not connected */
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u8 port; /* port number on switch */
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};
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/**
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* struct tb - main thunderbolt bus structure
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*/
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@ -20,6 +42,7 @@ struct tb {
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struct tb_nhi *nhi;
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struct tb_ctl *ctl;
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struct workqueue_struct *wq; /* ordered workqueue for plug events */
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struct tb_switch *root_switch;
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bool hotplug_active; /*
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* tb_handle_hotplug will stop progressing plug
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* events and exit if this is not set (it needs to
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@ -29,7 +52,122 @@ struct tb {
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};
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/* helper functions & macros */
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/**
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* tb_upstream_port() - return the upstream port of a switch
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*
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* Every switch has an upstream port (for the root switch it is the NHI).
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*
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* During switch alloc/init tb_upstream_port()->remote may be NULL, even for
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* non root switches (on the NHI port remote is always NULL).
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*
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* Return: Returns the upstream port of the switch.
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*/
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static inline struct tb_port *tb_upstream_port(struct tb_switch *sw)
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{
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return &sw->ports[sw->config.upstream_port_number];
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}
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static inline u64 tb_route(struct tb_switch *sw)
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{
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return ((u64) sw->config.route_hi) << 32 | sw->config.route_lo;
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}
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static inline int tb_sw_read(struct tb_switch *sw, void *buffer,
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enum tb_cfg_space space, u32 offset, u32 length)
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{
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return tb_cfg_read(sw->tb->ctl,
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buffer,
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tb_route(sw),
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0,
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space,
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offset,
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length);
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}
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static inline int tb_sw_write(struct tb_switch *sw, void *buffer,
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enum tb_cfg_space space, u32 offset, u32 length)
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{
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return tb_cfg_write(sw->tb->ctl,
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buffer,
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tb_route(sw),
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0,
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space,
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offset,
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length);
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}
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static inline int tb_port_read(struct tb_port *port, void *buffer,
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enum tb_cfg_space space, u32 offset, u32 length)
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{
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return tb_cfg_read(port->sw->tb->ctl,
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buffer,
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tb_route(port->sw),
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port->port,
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space,
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offset,
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length);
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}
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static inline int tb_port_write(struct tb_port *port, void *buffer,
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enum tb_cfg_space space, u32 offset, u32 length)
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{
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return tb_cfg_write(port->sw->tb->ctl,
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buffer,
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tb_route(port->sw),
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port->port,
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space,
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offset,
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length);
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}
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#define tb_err(tb, fmt, arg...) dev_err(&(tb)->nhi->pdev->dev, fmt, ## arg)
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#define tb_WARN(tb, fmt, arg...) dev_WARN(&(tb)->nhi->pdev->dev, fmt, ## arg)
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#define tb_warn(tb, fmt, arg...) dev_warn(&(tb)->nhi->pdev->dev, fmt, ## arg)
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#define tb_info(tb, fmt, arg...) dev_info(&(tb)->nhi->pdev->dev, fmt, ## arg)
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#define __TB_SW_PRINT(level, sw, fmt, arg...) \
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do { \
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struct tb_switch *__sw = (sw); \
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level(__sw->tb, "%llx: " fmt, \
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tb_route(__sw), ## arg); \
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} while (0)
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#define tb_sw_WARN(sw, fmt, arg...) __TB_SW_PRINT(tb_WARN, sw, fmt, ##arg)
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#define tb_sw_warn(sw, fmt, arg...) __TB_SW_PRINT(tb_warn, sw, fmt, ##arg)
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#define tb_sw_info(sw, fmt, arg...) __TB_SW_PRINT(tb_info, sw, fmt, ##arg)
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#define __TB_PORT_PRINT(level, _port, fmt, arg...) \
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do { \
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struct tb_port *__port = (_port); \
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level(__port->sw->tb, "%llx:%x: " fmt, \
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tb_route(__port->sw), __port->port, ## arg); \
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} while (0)
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#define tb_port_WARN(port, fmt, arg...) \
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__TB_PORT_PRINT(tb_WARN, port, fmt, ##arg)
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#define tb_port_warn(port, fmt, arg...) \
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__TB_PORT_PRINT(tb_warn, port, fmt, ##arg)
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#define tb_port_info(port, fmt, arg...) \
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__TB_PORT_PRINT(tb_info, port, fmt, ##arg)
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struct tb *thunderbolt_alloc_and_start(struct tb_nhi *nhi);
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void thunderbolt_shutdown_and_free(struct tb *tb);
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struct tb_switch *tb_switch_alloc(struct tb *tb, u64 route);
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void tb_switch_free(struct tb_switch *sw);
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static inline int tb_route_length(u64 route)
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{
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return (fls64(route) + TB_ROUTE_SHIFT - 1) / TB_ROUTE_SHIFT;
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}
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static inline bool tb_is_upstream_port(struct tb_port *port)
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{
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return port == tb_upstream_port(port->sw);
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}
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#endif
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