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a25c8b2f AN |
1 | /* |
2 | * Thunderbolt Cactus Ridge driver - switch/port utility functions | |
3 | * | |
4 | * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com> | |
5 | */ | |
6 | ||
7 | #include <linux/delay.h> | |
8 | ||
9 | #include "tb.h" | |
10 | ||
11 | /* port utility functions */ | |
12 | ||
13 | static const char *tb_port_type(struct tb_regs_port_header *port) | |
14 | { | |
15 | switch (port->type >> 16) { | |
16 | case 0: | |
17 | switch ((u8) port->type) { | |
18 | case 0: | |
19 | return "Inactive"; | |
20 | case 1: | |
21 | return "Port"; | |
22 | case 2: | |
23 | return "NHI"; | |
24 | default: | |
25 | return "unknown"; | |
26 | } | |
27 | case 0x2: | |
28 | return "Ethernet"; | |
29 | case 0x8: | |
30 | return "SATA"; | |
31 | case 0xe: | |
32 | return "DP/HDMI"; | |
33 | case 0x10: | |
34 | return "PCIe"; | |
35 | case 0x20: | |
36 | return "USB"; | |
37 | default: | |
38 | return "unknown"; | |
39 | } | |
40 | } | |
41 | ||
42 | static void tb_dump_port(struct tb *tb, struct tb_regs_port_header *port) | |
43 | { | |
44 | tb_info(tb, | |
45 | " Port %d: %x:%x (Revision: %d, TB Version: %d, Type: %s (%#x))\n", | |
46 | port->port_number, port->vendor_id, port->device_id, | |
47 | port->revision, port->thunderbolt_version, tb_port_type(port), | |
48 | port->type); | |
49 | tb_info(tb, " Max hop id (in/out): %d/%d\n", | |
50 | port->max_in_hop_id, port->max_out_hop_id); | |
51 | tb_info(tb, " Max counters: %d\n", port->max_counters); | |
52 | tb_info(tb, " NFC Credits: %#x\n", port->nfc_credits); | |
53 | } | |
54 | ||
55 | /** | |
56 | * tb_init_port() - initialize a port | |
57 | * | |
58 | * This is a helper method for tb_switch_alloc. Does not check or initialize | |
59 | * any downstream switches. | |
60 | * | |
61 | * Return: Returns 0 on success or an error code on failure. | |
62 | */ | |
63 | static int tb_init_port(struct tb_switch *sw, u8 port_nr) | |
64 | { | |
65 | int res; | |
66 | struct tb_port *port = &sw->ports[port_nr]; | |
67 | port->sw = sw; | |
68 | port->port = port_nr; | |
69 | port->remote = NULL; | |
70 | res = tb_port_read(port, &port->config, TB_CFG_PORT, 0, 8); | |
71 | if (res) | |
72 | return res; | |
73 | ||
74 | tb_dump_port(sw->tb, &port->config); | |
75 | ||
76 | /* TODO: Read dual link port, DP port and more from EEPROM. */ | |
77 | return 0; | |
78 | ||
79 | } | |
80 | ||
81 | /* switch utility functions */ | |
82 | ||
83 | static void tb_dump_switch(struct tb *tb, struct tb_regs_switch_header *sw) | |
84 | { | |
85 | tb_info(tb, | |
86 | " Switch: %x:%x (Revision: %d, TB Version: %d)\n", | |
87 | sw->vendor_id, sw->device_id, sw->revision, | |
88 | sw->thunderbolt_version); | |
89 | tb_info(tb, " Max Port Number: %d\n", sw->max_port_number); | |
90 | tb_info(tb, " Config:\n"); | |
91 | tb_info(tb, | |
92 | " Upstream Port Number: %d Depth: %d Route String: %#llx Enabled: %d, PlugEventsDelay: %dms\n", | |
93 | sw->upstream_port_number, sw->depth, | |
94 | (((u64) sw->route_hi) << 32) | sw->route_lo, | |
95 | sw->enabled, sw->plug_events_delay); | |
96 | tb_info(tb, | |
97 | " unknown1: %#x unknown4: %#x\n", | |
98 | sw->__unknown1, sw->__unknown4); | |
99 | } | |
100 | ||
ca389f71 AN |
101 | /** |
102 | * tb_plug_events_active() - enable/disable plug events on a switch | |
103 | * | |
104 | * Also configures a sane plug_events_delay of 255ms. | |
105 | * | |
106 | * Return: Returns 0 on success or an error code on failure. | |
107 | */ | |
108 | static int tb_plug_events_active(struct tb_switch *sw, bool active) | |
109 | { | |
110 | u32 data; | |
111 | int res; | |
112 | ||
113 | sw->config.plug_events_delay = 0xff; | |
114 | res = tb_sw_write(sw, ((u32 *) &sw->config) + 4, TB_CFG_SWITCH, 4, 1); | |
115 | if (res) | |
116 | return res; | |
117 | ||
118 | res = tb_sw_read(sw, &data, TB_CFG_SWITCH, sw->cap_plug_events + 1, 1); | |
119 | if (res) | |
120 | return res; | |
121 | ||
122 | if (active) { | |
123 | data = data & 0xFFFFFF83; | |
124 | switch (sw->config.device_id) { | |
125 | case 0x1513: | |
126 | case 0x151a: | |
127 | case 0x1549: | |
128 | break; | |
129 | default: | |
130 | data |= 4; | |
131 | } | |
132 | } else { | |
133 | data = data | 0x7c; | |
134 | } | |
135 | return tb_sw_write(sw, &data, TB_CFG_SWITCH, | |
136 | sw->cap_plug_events + 1, 1); | |
137 | } | |
138 | ||
139 | ||
a25c8b2f AN |
140 | /** |
141 | * tb_switch_free() - free a tb_switch and all downstream switches | |
142 | */ | |
143 | void tb_switch_free(struct tb_switch *sw) | |
144 | { | |
145 | int i; | |
146 | /* port 0 is the switch itself and never has a remote */ | |
147 | for (i = 1; i <= sw->config.max_port_number; i++) { | |
148 | if (tb_is_upstream_port(&sw->ports[i])) | |
149 | continue; | |
150 | if (sw->ports[i].remote) | |
151 | tb_switch_free(sw->ports[i].remote->sw); | |
152 | sw->ports[i].remote = NULL; | |
153 | } | |
154 | ||
ca389f71 AN |
155 | tb_plug_events_active(sw, false); |
156 | ||
a25c8b2f AN |
157 | kfree(sw->ports); |
158 | kfree(sw); | |
159 | } | |
160 | ||
161 | /** | |
162 | * tb_switch_alloc() - allocate and initialize a switch | |
163 | * | |
164 | * Return: Returns a NULL on failure. | |
165 | */ | |
166 | struct tb_switch *tb_switch_alloc(struct tb *tb, u64 route) | |
167 | { | |
168 | int i; | |
ca389f71 | 169 | int cap; |
a25c8b2f AN |
170 | struct tb_switch *sw; |
171 | int upstream_port = tb_cfg_get_upstream_port(tb->ctl, route); | |
172 | if (upstream_port < 0) | |
173 | return NULL; | |
174 | ||
175 | sw = kzalloc(sizeof(*sw), GFP_KERNEL); | |
176 | if (!sw) | |
177 | return NULL; | |
178 | ||
179 | sw->tb = tb; | |
180 | if (tb_cfg_read(tb->ctl, &sw->config, route, 0, 2, 0, 5)) | |
181 | goto err; | |
182 | tb_info(tb, | |
183 | "initializing Switch at %#llx (depth: %d, up port: %d)\n", | |
184 | route, tb_route_length(route), upstream_port); | |
185 | tb_info(tb, "old switch config:\n"); | |
186 | tb_dump_switch(tb, &sw->config); | |
187 | ||
188 | /* configure switch */ | |
189 | sw->config.upstream_port_number = upstream_port; | |
190 | sw->config.depth = tb_route_length(route); | |
191 | sw->config.route_lo = route; | |
192 | sw->config.route_hi = route >> 32; | |
193 | sw->config.enabled = 1; | |
194 | /* from here on we may use the tb_sw_* functions & macros */ | |
195 | ||
196 | if (sw->config.vendor_id != 0x8086) | |
197 | tb_sw_warn(sw, "unknown switch vendor id %#x\n", | |
198 | sw->config.vendor_id); | |
199 | ||
200 | if (sw->config.device_id != 0x1547 && sw->config.device_id != 0x1549) | |
201 | tb_sw_warn(sw, "unsupported switch device id %#x\n", | |
202 | sw->config.device_id); | |
203 | ||
204 | /* upload configuration */ | |
205 | if (tb_sw_write(sw, 1 + (u32 *) &sw->config, TB_CFG_SWITCH, 1, 3)) | |
206 | goto err; | |
207 | ||
208 | /* initialize ports */ | |
209 | sw->ports = kcalloc(sw->config.max_port_number + 1, sizeof(*sw->ports), | |
210 | GFP_KERNEL); | |
211 | if (!sw->ports) | |
212 | goto err; | |
213 | ||
214 | for (i = 0; i <= sw->config.max_port_number; i++) { | |
215 | if (tb_init_port(sw, i)) | |
216 | goto err; | |
217 | /* TODO: check if port is disabled (EEPROM) */ | |
218 | } | |
219 | ||
220 | /* TODO: I2C, IECS, EEPROM, link controller */ | |
221 | ||
ca389f71 AN |
222 | cap = tb_find_cap(&sw->ports[0], TB_CFG_SWITCH, TB_CAP_PLUG_EVENTS); |
223 | if (cap < 0) { | |
224 | tb_sw_warn(sw, "cannot find TB_CAP_PLUG_EVENTS aborting\n"); | |
225 | goto err; | |
226 | } | |
227 | sw->cap_plug_events = cap; | |
228 | ||
229 | if (tb_plug_events_active(sw, true)) | |
230 | goto err; | |
231 | ||
a25c8b2f AN |
232 | return sw; |
233 | err: | |
234 | kfree(sw->ports); | |
235 | kfree(sw); | |
236 | return NULL; | |
237 | } | |
238 |