1 /*
2  * Copyright 2019 Advanced Micro Devices, Inc.
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a
5  * copy of this software and associated documentation files (the "Software"),
6  * to deal in the Software without restriction, including without limitation
7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8  * and/or sell copies of the Software, and to permit persons to whom the
9  * Software is furnished to do so, subject to the following conditions:
10  *
11  * The above copyright notice and this permission notice shall be included in
12  * all copies or substantial portions of the Software.
13  *
14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20  * OTHER DEALINGS IN THE SOFTWARE.
21  *
22  * Authors: AMD
23  *
24  */
25 
26 #include <linux/slab.h>
27 
28 #include "dm_services.h"
29 #include "dm_helpers.h"
30 #include "include/hdcp_msg_types.h"
31 #include "include/signal_types.h"
32 #include "core_types.h"
33 #include "link.h"
34 #include "link_hwss.h"
35 #include "link/protocols/link_dpcd.h"
36 
37 #define DC_LOGGER \
38 	link->ctx->logger
39 #define HDCP14_KSV_SIZE 5
40 #define HDCP14_MAX_KSV_FIFO_SIZE 127*HDCP14_KSV_SIZE
41 
42 static const bool hdcp_cmd_is_read[HDCP_MESSAGE_ID_MAX] = {
43 	[HDCP_MESSAGE_ID_READ_BKSV] = true,
44 	[HDCP_MESSAGE_ID_READ_RI_R0] = true,
45 	[HDCP_MESSAGE_ID_READ_PJ] = true,
46 	[HDCP_MESSAGE_ID_WRITE_AKSV] = false,
47 	[HDCP_MESSAGE_ID_WRITE_AINFO] = false,
48 	[HDCP_MESSAGE_ID_WRITE_AN] = false,
49 	[HDCP_MESSAGE_ID_READ_VH_X] = true,
50 	[HDCP_MESSAGE_ID_READ_VH_0] = true,
51 	[HDCP_MESSAGE_ID_READ_VH_1] = true,
52 	[HDCP_MESSAGE_ID_READ_VH_2] = true,
53 	[HDCP_MESSAGE_ID_READ_VH_3] = true,
54 	[HDCP_MESSAGE_ID_READ_VH_4] = true,
55 	[HDCP_MESSAGE_ID_READ_BCAPS] = true,
56 	[HDCP_MESSAGE_ID_READ_BSTATUS] = true,
57 	[HDCP_MESSAGE_ID_READ_KSV_FIFO] = true,
58 	[HDCP_MESSAGE_ID_READ_BINFO] = true,
59 	[HDCP_MESSAGE_ID_HDCP2VERSION] = true,
60 	[HDCP_MESSAGE_ID_RX_CAPS] = true,
61 	[HDCP_MESSAGE_ID_WRITE_AKE_INIT] = false,
62 	[HDCP_MESSAGE_ID_READ_AKE_SEND_CERT] = true,
63 	[HDCP_MESSAGE_ID_WRITE_AKE_NO_STORED_KM] = false,
64 	[HDCP_MESSAGE_ID_WRITE_AKE_STORED_KM] = false,
65 	[HDCP_MESSAGE_ID_READ_AKE_SEND_H_PRIME] = true,
66 	[HDCP_MESSAGE_ID_READ_AKE_SEND_PAIRING_INFO] = true,
67 	[HDCP_MESSAGE_ID_WRITE_LC_INIT] = false,
68 	[HDCP_MESSAGE_ID_READ_LC_SEND_L_PRIME] = true,
69 	[HDCP_MESSAGE_ID_WRITE_SKE_SEND_EKS] = false,
70 	[HDCP_MESSAGE_ID_READ_REPEATER_AUTH_SEND_RECEIVERID_LIST] = true,
71 	[HDCP_MESSAGE_ID_WRITE_REPEATER_AUTH_SEND_ACK] = false,
72 	[HDCP_MESSAGE_ID_WRITE_REPEATER_AUTH_STREAM_MANAGE] = false,
73 	[HDCP_MESSAGE_ID_READ_REPEATER_AUTH_STREAM_READY] = true,
74 	[HDCP_MESSAGE_ID_READ_RXSTATUS] = true,
75 	[HDCP_MESSAGE_ID_WRITE_CONTENT_STREAM_TYPE] = false
76 };
77 
78 static const uint8_t hdcp_i2c_offsets[HDCP_MESSAGE_ID_MAX] = {
79 	[HDCP_MESSAGE_ID_READ_BKSV] = 0x0,
80 	[HDCP_MESSAGE_ID_READ_RI_R0] = 0x8,
81 	[HDCP_MESSAGE_ID_READ_PJ] = 0xA,
82 	[HDCP_MESSAGE_ID_WRITE_AKSV] = 0x10,
83 	[HDCP_MESSAGE_ID_WRITE_AINFO] = 0x15,
84 	[HDCP_MESSAGE_ID_WRITE_AN] = 0x18,
85 	[HDCP_MESSAGE_ID_READ_VH_X] = 0x20,
86 	[HDCP_MESSAGE_ID_READ_VH_0] = 0x20,
87 	[HDCP_MESSAGE_ID_READ_VH_1] = 0x24,
88 	[HDCP_MESSAGE_ID_READ_VH_2] = 0x28,
89 	[HDCP_MESSAGE_ID_READ_VH_3] = 0x2C,
90 	[HDCP_MESSAGE_ID_READ_VH_4] = 0x30,
91 	[HDCP_MESSAGE_ID_READ_BCAPS] = 0x40,
92 	[HDCP_MESSAGE_ID_READ_BSTATUS] = 0x41,
93 	[HDCP_MESSAGE_ID_READ_KSV_FIFO] = 0x43,
94 	[HDCP_MESSAGE_ID_READ_BINFO] = 0xFF,
95 	[HDCP_MESSAGE_ID_HDCP2VERSION] = 0x50,
96 	[HDCP_MESSAGE_ID_WRITE_AKE_INIT] = 0x60,
97 	[HDCP_MESSAGE_ID_READ_AKE_SEND_CERT] = 0x80,
98 	[HDCP_MESSAGE_ID_WRITE_AKE_NO_STORED_KM] = 0x60,
99 	[HDCP_MESSAGE_ID_WRITE_AKE_STORED_KM] = 0x60,
100 	[HDCP_MESSAGE_ID_READ_AKE_SEND_H_PRIME] = 0x80,
101 	[HDCP_MESSAGE_ID_READ_AKE_SEND_PAIRING_INFO] = 0x80,
102 	[HDCP_MESSAGE_ID_WRITE_LC_INIT] = 0x60,
103 	[HDCP_MESSAGE_ID_READ_LC_SEND_L_PRIME] = 0x80,
104 	[HDCP_MESSAGE_ID_WRITE_SKE_SEND_EKS] = 0x60,
105 	[HDCP_MESSAGE_ID_READ_REPEATER_AUTH_SEND_RECEIVERID_LIST] = 0x80,
106 	[HDCP_MESSAGE_ID_WRITE_REPEATER_AUTH_SEND_ACK] = 0x60,
107 	[HDCP_MESSAGE_ID_WRITE_REPEATER_AUTH_STREAM_MANAGE] = 0x60,
108 	[HDCP_MESSAGE_ID_READ_REPEATER_AUTH_STREAM_READY] = 0x80,
109 	[HDCP_MESSAGE_ID_READ_RXSTATUS] = 0x70,
110 	[HDCP_MESSAGE_ID_WRITE_CONTENT_STREAM_TYPE] = 0x0,
111 };
112 
113 struct protection_properties {
114 	bool supported;
115 	bool (*process_transaction)(
116 		struct dc_link *link,
117 		struct hdcp_protection_message *message_info);
118 };
119 
120 static const struct protection_properties non_supported_protection = {
121 	.supported = false
122 };
123 
124 static bool hdmi_14_process_transaction(
125 	struct dc_link *link,
126 	struct hdcp_protection_message *message_info)
127 {
128 	uint8_t *buff = NULL;
129 	bool result;
130 	const uint8_t hdcp_i2c_addr_link_primary = 0x3a; /* 0x74 >> 1*/
131 	const uint8_t hdcp_i2c_addr_link_secondary = 0x3b; /* 0x76 >> 1*/
132 	struct i2c_command i2c_command;
133 	uint8_t offset = hdcp_i2c_offsets[message_info->msg_id];
134 	struct i2c_payload i2c_payloads[] = {
135 		{ true, 0, 1, &offset },
136 		/* actual hdcp payload, will be filled later, zeroed for now*/
137 		{ 0 }
138 	};
139 
140 	switch (message_info->link) {
141 	case HDCP_LINK_SECONDARY:
142 		i2c_payloads[0].address = hdcp_i2c_addr_link_secondary;
143 		i2c_payloads[1].address = hdcp_i2c_addr_link_secondary;
144 		break;
145 	case HDCP_LINK_PRIMARY:
146 	default:
147 		i2c_payloads[0].address = hdcp_i2c_addr_link_primary;
148 		i2c_payloads[1].address = hdcp_i2c_addr_link_primary;
149 		break;
150 	}
151 
152 	if (hdcp_cmd_is_read[message_info->msg_id]) {
153 		i2c_payloads[1].write = false;
154 		i2c_command.number_of_payloads = ARRAY_SIZE(i2c_payloads);
155 		i2c_payloads[1].length = message_info->length;
156 		i2c_payloads[1].data = message_info->data;
157 	} else {
158 		i2c_command.number_of_payloads = 1;
159 		buff = kzalloc(message_info->length + 1, GFP_KERNEL);
160 
161 		if (!buff)
162 			return false;
163 
164 		buff[0] = offset;
165 		memmove(&buff[1], message_info->data, message_info->length);
166 		i2c_payloads[0].length = message_info->length + 1;
167 		i2c_payloads[0].data = buff;
168 	}
169 
170 	i2c_command.payloads = i2c_payloads;
171 	i2c_command.engine = I2C_COMMAND_ENGINE_HW;//only HW
172 	i2c_command.speed = link->ddc->ctx->dc->caps.i2c_speed_in_khz;
173 
174 	result = dm_helpers_submit_i2c(
175 			link->ctx,
176 			link,
177 			&i2c_command);
178 	kfree(buff);
179 
180 	return result;
181 }
182 
183 static const struct protection_properties hdmi_14_protection = {
184 	.supported = true,
185 	.process_transaction = hdmi_14_process_transaction
186 };
187 
188 static const uint32_t hdcp_dpcd_addrs[HDCP_MESSAGE_ID_MAX] = {
189 	[HDCP_MESSAGE_ID_READ_BKSV] = 0x68000,
190 	[HDCP_MESSAGE_ID_READ_RI_R0] = 0x68005,
191 	[HDCP_MESSAGE_ID_READ_PJ] = 0xFFFFFFFF,
192 	[HDCP_MESSAGE_ID_WRITE_AKSV] = 0x68007,
193 	[HDCP_MESSAGE_ID_WRITE_AINFO] = 0x6803B,
194 	[HDCP_MESSAGE_ID_WRITE_AN] = 0x6800c,
195 	[HDCP_MESSAGE_ID_READ_VH_X] = 0x68014,
196 	[HDCP_MESSAGE_ID_READ_VH_0] = 0x68014,
197 	[HDCP_MESSAGE_ID_READ_VH_1] = 0x68018,
198 	[HDCP_MESSAGE_ID_READ_VH_2] = 0x6801c,
199 	[HDCP_MESSAGE_ID_READ_VH_3] = 0x68020,
200 	[HDCP_MESSAGE_ID_READ_VH_4] = 0x68024,
201 	[HDCP_MESSAGE_ID_READ_BCAPS] = 0x68028,
202 	[HDCP_MESSAGE_ID_READ_BSTATUS] = 0x68029,
203 	[HDCP_MESSAGE_ID_READ_KSV_FIFO] = 0x6802c,
204 	[HDCP_MESSAGE_ID_READ_BINFO] = 0x6802a,
205 	[HDCP_MESSAGE_ID_RX_CAPS] = 0x6921d,
206 	[HDCP_MESSAGE_ID_WRITE_AKE_INIT] = 0x69000,
207 	[HDCP_MESSAGE_ID_READ_AKE_SEND_CERT] = 0x6900b,
208 	[HDCP_MESSAGE_ID_WRITE_AKE_NO_STORED_KM] = 0x69220,
209 	[HDCP_MESSAGE_ID_WRITE_AKE_STORED_KM] = 0x692a0,
210 	[HDCP_MESSAGE_ID_READ_AKE_SEND_H_PRIME] = 0x692c0,
211 	[HDCP_MESSAGE_ID_READ_AKE_SEND_PAIRING_INFO] = 0x692e0,
212 	[HDCP_MESSAGE_ID_WRITE_LC_INIT] = 0x692f0,
213 	[HDCP_MESSAGE_ID_READ_LC_SEND_L_PRIME] = 0x692f8,
214 	[HDCP_MESSAGE_ID_WRITE_SKE_SEND_EKS] = 0x69318,
215 	[HDCP_MESSAGE_ID_READ_REPEATER_AUTH_SEND_RECEIVERID_LIST] = 0x69330,
216 	[HDCP_MESSAGE_ID_WRITE_REPEATER_AUTH_SEND_ACK] = 0x693e0,
217 	[HDCP_MESSAGE_ID_WRITE_REPEATER_AUTH_STREAM_MANAGE] = 0x693f0,
218 	[HDCP_MESSAGE_ID_READ_REPEATER_AUTH_STREAM_READY] = 0x69473,
219 	[HDCP_MESSAGE_ID_READ_RXSTATUS] = 0x69493,
220 	[HDCP_MESSAGE_ID_WRITE_CONTENT_STREAM_TYPE] = 0x69494
221 };
222 
223 static bool dpcd_access_helper(
224 	struct dc_link *link,
225 	uint32_t length,
226 	uint8_t *data,
227 	uint32_t dpcd_addr,
228 	bool is_read)
229 {
230 	enum dc_status status;
231 	uint32_t cur_length = 0;
232 	uint32_t offset = 0;
233 	uint32_t ksv_read_size = 0x6803b - 0x6802c;
234 
235 	/* Read KSV, need repeatedly handle */
236 	if (dpcd_addr == 0x6802c) {
237 		if (length % HDCP14_KSV_SIZE) {
238 			DC_LOG_ERROR("%s: KsvFifo Size(%d) is not a multiple of HDCP14_KSV_SIZE(%d)\n",
239 				__func__,
240 				length,
241 				HDCP14_KSV_SIZE);
242 		}
243 		if (length > HDCP14_MAX_KSV_FIFO_SIZE) {
244 			DC_LOG_ERROR("%s: KsvFifo Size(%d) is greater than HDCP14_MAX_KSV_FIFO_SIZE(%d)\n",
245 				__func__,
246 				length,
247 				HDCP14_MAX_KSV_FIFO_SIZE);
248 		}
249 
250 		DC_LOG_ERROR("%s: Reading %d Ksv(s) from KsvFifo\n",
251 			__func__,
252 			length / HDCP14_KSV_SIZE);
253 
254 		while (length > 0) {
255 			if (length > ksv_read_size) {
256 				status = core_link_read_dpcd(
257 					link,
258 					dpcd_addr + offset,
259 					data + offset,
260 					ksv_read_size);
261 
262 				data += ksv_read_size;
263 				length -= ksv_read_size;
264 			} else {
265 				status = core_link_read_dpcd(
266 					link,
267 					dpcd_addr + offset,
268 					data + offset,
269 					length);
270 
271 				data += length;
272 				length = 0;
273 			}
274 
275 			if (status != DC_OK)
276 				return false;
277 		}
278 	} else {
279 		while (length > 0) {
280 			if (length > DEFAULT_AUX_MAX_DATA_SIZE)
281 				cur_length = DEFAULT_AUX_MAX_DATA_SIZE;
282 			else
283 				cur_length = length;
284 
285 			if (is_read) {
286 				status = core_link_read_dpcd(
287 					link,
288 					dpcd_addr + offset,
289 					data + offset,
290 					cur_length);
291 			} else {
292 				status = core_link_write_dpcd(
293 					link,
294 					dpcd_addr + offset,
295 					data + offset,
296 					cur_length);
297 			}
298 
299 			if (status != DC_OK)
300 				return false;
301 
302 			length -= cur_length;
303 			offset += cur_length;
304 		}
305 	}
306 	return true;
307 }
308 
309 static bool dp_11_process_transaction(
310 	struct dc_link *link,
311 	struct hdcp_protection_message *message_info)
312 {
313 	return dpcd_access_helper(
314 		link,
315 		message_info->length,
316 		message_info->data,
317 		hdcp_dpcd_addrs[message_info->msg_id],
318 		hdcp_cmd_is_read[message_info->msg_id]);
319 }
320 
321 static const struct protection_properties dp_11_protection = {
322 	.supported = true,
323 	.process_transaction = dp_11_process_transaction
324 };
325 
326 static const struct protection_properties *get_protection_properties_by_signal(
327 	struct dc_link *link,
328 	enum signal_type st,
329 	enum hdcp_version version)
330 {
331 	switch (version) {
332 	case HDCP_VERSION_14:
333 		switch (st) {
334 		case SIGNAL_TYPE_DVI_SINGLE_LINK:
335 		case SIGNAL_TYPE_DVI_DUAL_LINK:
336 		case SIGNAL_TYPE_HDMI_TYPE_A:
337 			return &hdmi_14_protection;
338 		case SIGNAL_TYPE_DISPLAY_PORT:
339 			if (link &&
340 				(link->dpcd_caps.dongle_type == DISPLAY_DONGLE_DP_VGA_CONVERTER ||
341 				link->dpcd_caps.dongle_caps.dongle_type == DISPLAY_DONGLE_DP_VGA_CONVERTER)) {
342 				return &non_supported_protection;
343 			}
344 			return &dp_11_protection;
345 		case SIGNAL_TYPE_DISPLAY_PORT_MST:
346 		case SIGNAL_TYPE_EDP:
347 			return &dp_11_protection;
348 		default:
349 			return &non_supported_protection;
350 		}
351 		break;
352 	case HDCP_VERSION_22:
353 		switch (st) {
354 		case SIGNAL_TYPE_DVI_SINGLE_LINK:
355 		case SIGNAL_TYPE_DVI_DUAL_LINK:
356 		case SIGNAL_TYPE_HDMI_TYPE_A:
357 			return &hdmi_14_protection; //todo version2.2
358 		case SIGNAL_TYPE_DISPLAY_PORT:
359 		case SIGNAL_TYPE_DISPLAY_PORT_MST:
360 		case SIGNAL_TYPE_EDP:
361 			return &dp_11_protection;  //todo version2.2
362 		default:
363 			return &non_supported_protection;
364 		}
365 		break;
366 	default:
367 		return &non_supported_protection;
368 	}
369 }
370 
371 enum hdcp_message_status dc_process_hdcp_msg(
372 	enum signal_type signal,
373 	struct dc_link *link,
374 	struct hdcp_protection_message *message_info)
375 {
376 	enum hdcp_message_status status = HDCP_MESSAGE_FAILURE;
377 	uint32_t i = 0;
378 
379 	const struct protection_properties *protection_props;
380 
381 	if (!message_info)
382 		return HDCP_MESSAGE_UNSUPPORTED;
383 
384 	if (message_info->msg_id < HDCP_MESSAGE_ID_READ_BKSV ||
385 		message_info->msg_id >= HDCP_MESSAGE_ID_MAX)
386 		return HDCP_MESSAGE_UNSUPPORTED;
387 
388 	protection_props =
389 		get_protection_properties_by_signal(
390 			link,
391 			signal,
392 			message_info->version);
393 
394 	if (!protection_props->supported)
395 		return HDCP_MESSAGE_UNSUPPORTED;
396 
397 	if (protection_props->process_transaction(
398 		link,
399 		message_info)) {
400 		status = HDCP_MESSAGE_SUCCESS;
401 	} else {
402 		for (i = 0; i < message_info->max_retries; i++) {
403 			if (protection_props->process_transaction(
404 						link,
405 						message_info)) {
406 				status = HDCP_MESSAGE_SUCCESS;
407 				break;
408 			}
409 		}
410 	}
411 
412 	return status;
413 }
414 
415