diff options
Diffstat (limited to 'drivers/thunderbolt/switch.c')
| -rw-r--r-- | drivers/thunderbolt/switch.c | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c new file mode 100644 index 000000000000..e89121ffe44e --- /dev/null +++ b/drivers/thunderbolt/switch.c @@ -0,0 +1,186 @@ +/* + * 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_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; + } + + 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; + 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 */ + + return sw; +err: + kfree(sw->ports); + kfree(sw); + return NULL; +} + |