Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 1 | /* |
| 2 | * SVC Greybus driver. |
| 3 | * |
| 4 | * Copyright 2015 Google Inc. |
| 5 | * Copyright 2015 Linaro Ltd. |
| 6 | * |
| 7 | * Released under the GPLv2 only. |
| 8 | */ |
| 9 | |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 10 | #include "greybus.h" |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 11 | |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 12 | static struct ida greybus_svc_device_id_map; |
| 13 | |
Viresh Kumar | d3d4484 | 2015-07-21 17:44:18 +0530 | [diff] [blame] | 14 | /* |
| 15 | * AP's SVC cport is required early to get messages from the SVC. This happens |
| 16 | * even before the Endo is created and hence any modules or interfaces. |
| 17 | * |
| 18 | * This is a temporary connection, used only at initial bootup. |
| 19 | */ |
| 20 | struct gb_connection * |
| 21 | gb_ap_svc_connection_create(struct greybus_host_device *hd) |
| 22 | { |
| 23 | struct gb_connection *connection; |
| 24 | |
| 25 | connection = gb_connection_create_range(hd, NULL, hd->parent, |
| 26 | GB_SVC_CPORT_ID, |
| 27 | GREYBUS_PROTOCOL_SVC, |
| 28 | GB_SVC_CPORT_ID, |
| 29 | GB_SVC_CPORT_ID + 1); |
| 30 | |
| 31 | return connection; |
| 32 | } |
| 33 | EXPORT_SYMBOL_GPL(gb_ap_svc_connection_create); |
| 34 | |
| 35 | /* |
| 36 | * We know endo-type and AP's interface id now, lets create a proper svc |
| 37 | * connection (and its interface/bundle) now and get rid of the initial |
| 38 | * 'partially' initialized one svc connection. |
| 39 | */ |
| 40 | static struct gb_interface * |
| 41 | gb_ap_interface_create(struct greybus_host_device *hd, |
| 42 | struct gb_connection *connection, u8 interface_id) |
| 43 | { |
| 44 | struct gb_interface *intf; |
| 45 | struct device *dev = &hd->endo->dev; |
| 46 | int ret; |
| 47 | |
| 48 | intf = gb_interface_create(hd, interface_id); |
| 49 | if (!intf) { |
| 50 | dev_err(dev, "%s: Failed to create interface with id %hhu\n", |
| 51 | __func__, interface_id); |
| 52 | return NULL; |
| 53 | } |
| 54 | |
| 55 | intf->device_id = GB_DEVICE_ID_AP; |
| 56 | |
| 57 | /* |
| 58 | * XXX: Disable the initial svc connection here, but don't destroy it |
| 59 | * yet. We do need to send a response of 'svc-hello message' on that. |
| 60 | */ |
| 61 | |
| 62 | /* Establish new control CPort connection */ |
| 63 | ret = gb_create_bundle_connection(intf, GREYBUS_CLASS_SVC); |
| 64 | if (ret) { |
| 65 | dev_err(&intf->dev, "%s: Failed to create svc connection (%d %d)\n", |
| 66 | __func__, interface_id, ret); |
| 67 | gb_interface_destroy(intf); |
| 68 | intf = NULL; |
| 69 | } |
| 70 | |
| 71 | return intf; |
| 72 | } |
| 73 | |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 74 | static int intf_device_id_operation(struct gb_svc *svc, |
| 75 | u8 intf_id, u8 device_id) |
| 76 | { |
| 77 | struct gb_svc_intf_device_id_request request; |
| 78 | |
| 79 | request.intf_id = intf_id; |
| 80 | request.device_id = device_id; |
| 81 | |
| 82 | return gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_DEVICE_ID, |
| 83 | &request, sizeof(request), NULL, 0); |
| 84 | } |
| 85 | |
| 86 | static int intf_reset_operation(struct gb_svc *svc, u8 intf_id) |
| 87 | { |
| 88 | struct gb_svc_intf_reset_request request; |
| 89 | |
| 90 | request.intf_id = intf_id; |
| 91 | |
| 92 | return gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_RESET, |
| 93 | &request, sizeof(request), NULL, 0); |
| 94 | } |
| 95 | |
| 96 | static int connection_create_operation(struct gb_svc *svc, |
| 97 | u8 intf1_id, u16 cport1_id, |
| 98 | u8 intf2_id, u16 cport2_id) |
| 99 | { |
| 100 | struct gb_svc_conn_create_request request; |
| 101 | |
| 102 | request.intf1_id = intf1_id; |
| 103 | request.cport1_id = cport1_id; |
| 104 | request.intf2_id = intf2_id; |
| 105 | request.cport2_id = cport2_id; |
| 106 | |
| 107 | return gb_operation_sync(svc->connection, GB_SVC_TYPE_CONN_CREATE, |
| 108 | &request, sizeof(request), NULL, 0); |
| 109 | } |
| 110 | |
| 111 | static int connection_destroy_operation(struct gb_svc *svc, |
| 112 | u8 intf1_id, u16 cport1_id, |
| 113 | u8 intf2_id, u16 cport2_id) |
| 114 | { |
| 115 | struct gb_svc_conn_destroy_request request; |
| 116 | |
| 117 | request.intf1_id = intf1_id; |
| 118 | request.cport1_id = cport1_id; |
| 119 | request.intf2_id = intf2_id; |
| 120 | request.cport2_id = cport2_id; |
| 121 | |
| 122 | return gb_operation_sync(svc->connection, GB_SVC_TYPE_CONN_DESTROY, |
| 123 | &request, sizeof(request), NULL, 0); |
| 124 | } |
| 125 | |
| 126 | int gb_svc_intf_device_id(struct gb_svc *svc, u8 intf_id, u8 device_id) |
| 127 | { |
| 128 | return intf_device_id_operation(svc, intf_id, device_id); |
| 129 | } |
| 130 | EXPORT_SYMBOL_GPL(gb_svc_intf_device_id); |
| 131 | |
| 132 | int gb_svc_intf_reset(struct gb_svc *svc, u8 intf_id) |
| 133 | { |
| 134 | return intf_reset_operation(svc, intf_id); |
| 135 | } |
| 136 | EXPORT_SYMBOL_GPL(gb_svc_intf_reset); |
| 137 | |
| 138 | int gb_svc_connection_create(struct gb_svc *svc, |
| 139 | u8 intf1_id, u16 cport1_id, |
| 140 | u8 intf2_id, u16 cport2_id) |
| 141 | { |
| 142 | return connection_create_operation(svc, intf1_id, cport1_id, |
| 143 | intf2_id, cport2_id); |
| 144 | } |
| 145 | EXPORT_SYMBOL_GPL(gb_svc_connection_create); |
| 146 | |
| 147 | int gb_svc_connection_destroy(struct gb_svc *svc, |
| 148 | u8 intf1_id, u16 cport1_id, |
| 149 | u8 intf2_id, u16 cport2_id) |
| 150 | { |
| 151 | return connection_destroy_operation(svc, intf1_id, cport1_id, |
| 152 | intf2_id, cport2_id); |
| 153 | } |
| 154 | EXPORT_SYMBOL_GPL(gb_svc_connection_destroy); |
| 155 | |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 156 | static int gb_svc_version_request(struct gb_operation *op) |
| 157 | { |
| 158 | struct gb_connection *connection = op->connection; |
| 159 | struct gb_protocol_version_response *version; |
| 160 | struct device *dev = &connection->dev; |
| 161 | |
| 162 | version = op->request->payload; |
| 163 | |
| 164 | if (version->major > GB_SVC_VERSION_MAJOR) { |
| 165 | dev_err(&connection->dev, |
| 166 | "unsupported major version (%hhu > %hhu)\n", |
| 167 | version->major, GB_SVC_VERSION_MAJOR); |
| 168 | return -ENOTSUPP; |
| 169 | } |
| 170 | |
| 171 | if (!gb_operation_response_alloc(op, sizeof(*version), GFP_KERNEL)) { |
| 172 | dev_err(dev, "%s: error allocating response\n", |
| 173 | __func__); |
| 174 | return -ENOMEM; |
| 175 | } |
| 176 | |
| 177 | version = op->response->payload; |
| 178 | version->major = GB_SVC_VERSION_MAJOR; |
| 179 | version->minor = GB_SVC_VERSION_MINOR; |
| 180 | return 0; |
| 181 | } |
| 182 | |
| 183 | static int gb_svc_hello(struct gb_operation *op) |
| 184 | { |
| 185 | struct gb_connection *connection = op->connection; |
| 186 | struct greybus_host_device *hd = connection->hd; |
| 187 | struct gb_svc_hello_request *hello_request; |
| 188 | struct device *dev = &connection->dev; |
| 189 | struct gb_interface *intf; |
| 190 | u16 endo_id; |
| 191 | u8 interface_id; |
| 192 | int ret; |
| 193 | |
| 194 | /* Hello message should be received only during early bootup */ |
| 195 | WARN_ON(hd->initial_svc_connection != connection); |
| 196 | |
| 197 | /* |
| 198 | * SVC sends information about the endo and interface-id on the hello |
| 199 | * request, use that to create an endo. |
| 200 | */ |
| 201 | if (op->request->payload_size != sizeof(*hello_request)) { |
| 202 | dev_err(dev, "%s: Illegal size of hello request (%d %d)\n", |
| 203 | __func__, op->request->payload_size, |
| 204 | sizeof(*hello_request)); |
| 205 | return -EINVAL; |
| 206 | } |
| 207 | |
| 208 | hello_request = op->request->payload; |
| 209 | endo_id = le16_to_cpu(hello_request->endo_id); |
| 210 | interface_id = hello_request->interface_id; |
| 211 | |
| 212 | /* Setup Endo */ |
| 213 | ret = greybus_endo_setup(hd, endo_id, interface_id); |
| 214 | if (ret) |
| 215 | return ret; |
| 216 | |
| 217 | /* |
| 218 | * Endo and its modules are ready now, fix AP's partially initialized |
| 219 | * svc protocol and its connection. |
| 220 | */ |
| 221 | intf = gb_ap_interface_create(hd, connection, interface_id); |
| 222 | if (!intf) { |
| 223 | gb_endo_remove(hd->endo); |
| 224 | return ret; |
| 225 | } |
| 226 | |
| 227 | return 0; |
| 228 | } |
| 229 | |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 230 | static int gb_svc_intf_hotplug_recv(struct gb_operation *op) |
| 231 | { |
| 232 | struct gb_message *request = op->request; |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 233 | struct gb_svc_intf_hotplug_request *hotplug = request->payload; |
| 234 | struct gb_svc *svc = op->connection->private; |
| 235 | struct greybus_host_device *hd = op->connection->bundle->intf->hd; |
| 236 | struct device *dev = &op->connection->dev; |
| 237 | struct gb_interface *intf; |
| 238 | u8 intf_id, device_id; |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 239 | u32 unipro_mfg_id; |
| 240 | u32 unipro_prod_id; |
| 241 | u32 ara_vend_id; |
| 242 | u32 ara_prod_id; |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 243 | int ret; |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 244 | |
| 245 | if (request->payload_size < sizeof(*hotplug)) { |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 246 | dev_err(dev, "%s: short hotplug request received\n", __func__); |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 247 | return -EINVAL; |
| 248 | } |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 249 | |
| 250 | /* |
| 251 | * Grab the information we need. |
| 252 | * |
| 253 | * XXX I'd really like to acknowledge receipt, and then |
| 254 | * XXX continue processing the request. There's no need |
| 255 | * XXX for the SVC to wait. In fact, it might be best to |
| 256 | * XXX have the SVC get acknowledgement before we proceed. |
Viresh Kumar | 7eb8919 | 2015-07-01 12:13:50 +0530 | [diff] [blame] | 257 | */ |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 258 | intf_id = hotplug->intf_id; |
Phong Tran | ea15a40 | 2015-05-27 21:31:02 +0700 | [diff] [blame] | 259 | unipro_mfg_id = le32_to_cpu(hotplug->data.unipro_mfg_id); |
| 260 | unipro_prod_id = le32_to_cpu(hotplug->data.unipro_prod_id); |
| 261 | ara_vend_id = le32_to_cpu(hotplug->data.ara_vend_id); |
| 262 | ara_prod_id = le32_to_cpu(hotplug->data.ara_prod_id); |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 263 | |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 264 | // FIXME May require firmware download |
| 265 | intf = gb_interface_create(hd, intf_id); |
| 266 | if (!intf) { |
| 267 | dev_err(dev, "%s: Failed to create interface with id %hhu\n", |
| 268 | __func__, intf_id); |
| 269 | return -EINVAL; |
| 270 | } |
| 271 | |
| 272 | /* |
| 273 | * Create a device id for the interface: |
| 274 | * - device id 0 (GB_DEVICE_ID_SVC) belongs to the SVC |
| 275 | * - device id 1 (GB_DEVICE_ID_AP) belongs to the AP |
| 276 | * |
| 277 | * XXX Do we need to allocate device ID for SVC or the AP here? And what |
| 278 | * XXX about an AP with multiple interface blocks? |
| 279 | */ |
| 280 | device_id = ida_simple_get(&greybus_svc_device_id_map, |
| 281 | GB_DEVICE_ID_MODULES_START, 0, GFP_ATOMIC); |
| 282 | if (device_id < 0) { |
| 283 | ret = device_id; |
| 284 | dev_err(dev, "%s: Failed to allocate device id for interface with id %hhu (%d)\n", |
| 285 | __func__, intf_id, ret); |
| 286 | goto destroy_interface; |
| 287 | } |
| 288 | |
| 289 | ret = intf_device_id_operation(svc, intf_id, device_id); |
| 290 | if (ret) { |
| 291 | dev_err(dev, "%s: Device id operation failed, interface %hhu device_id %hhu (%d)\n", |
| 292 | __func__, intf_id, device_id, ret); |
| 293 | goto ida_put; |
| 294 | } |
| 295 | |
| 296 | ret = gb_interface_init(intf, device_id); |
| 297 | if (ret) { |
| 298 | dev_err(dev, "%s: Failed to initialize interface, interface %hhu device_id %hhu (%d)\n", |
| 299 | __func__, intf_id, device_id, ret); |
| 300 | goto svc_id_free; |
| 301 | } |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 302 | |
| 303 | return 0; |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 304 | |
| 305 | svc_id_free: |
| 306 | /* |
| 307 | * XXX Should we tell SVC that this id doesn't belong to interface |
| 308 | * XXX anymore. |
| 309 | */ |
| 310 | ida_put: |
| 311 | ida_simple_remove(&greybus_svc_device_id_map, device_id); |
| 312 | destroy_interface: |
| 313 | gb_interface_remove(hd, intf_id); |
| 314 | |
| 315 | return ret; |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 316 | } |
| 317 | |
| 318 | static int gb_svc_intf_hot_unplug_recv(struct gb_operation *op) |
| 319 | { |
| 320 | struct gb_message *request = op->request; |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 321 | struct gb_svc_intf_hot_unplug_request *hot_unplug = request->payload; |
| 322 | struct greybus_host_device *hd = op->connection->bundle->intf->hd; |
| 323 | struct device *dev = &op->connection->dev; |
| 324 | u8 device_id; |
| 325 | struct gb_interface *intf; |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 326 | u8 intf_id; |
| 327 | |
| 328 | if (request->payload_size < sizeof(*hot_unplug)) { |
| 329 | dev_err(&op->connection->dev, |
| 330 | "short hot unplug request received\n"); |
| 331 | return -EINVAL; |
| 332 | } |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 333 | |
| 334 | intf_id = hot_unplug->intf_id; |
| 335 | |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 336 | intf = gb_interface_find(hd, intf_id); |
| 337 | if (!intf) { |
| 338 | dev_err(dev, "%s: Couldn't find interface for id %hhu\n", |
| 339 | __func__, intf_id); |
| 340 | return -EINVAL; |
| 341 | } |
| 342 | |
| 343 | device_id = intf->device_id; |
| 344 | gb_interface_remove(hd, intf_id); |
| 345 | ida_simple_remove(&greybus_svc_device_id_map, device_id); |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 346 | |
| 347 | return 0; |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 348 | } |
| 349 | |
| 350 | static int gb_svc_intf_reset_recv(struct gb_operation *op) |
| 351 | { |
| 352 | struct gb_message *request = op->request; |
| 353 | struct gb_svc_intf_reset_request *reset; |
| 354 | u8 intf_id; |
| 355 | |
| 356 | if (request->payload_size < sizeof(*reset)) { |
| 357 | dev_err(&op->connection->dev, |
| 358 | "short reset request received\n"); |
| 359 | return -EINVAL; |
| 360 | } |
| 361 | reset = request->payload; |
| 362 | |
| 363 | intf_id = reset->intf_id; |
| 364 | |
| 365 | /* FIXME Reset the interface here */ |
| 366 | |
| 367 | return 0; |
| 368 | } |
| 369 | |
| 370 | static int gb_svc_request_recv(u8 type, struct gb_operation *op) |
| 371 | { |
| 372 | switch (type) { |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 373 | case GB_SVC_TYPE_PROTOCOL_VERSION: |
| 374 | return gb_svc_version_request(op); |
| 375 | case GB_SVC_TYPE_SVC_HELLO: |
| 376 | return gb_svc_hello(op); |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 377 | case GB_SVC_TYPE_INTF_HOTPLUG: |
| 378 | return gb_svc_intf_hotplug_recv(op); |
| 379 | case GB_SVC_TYPE_INTF_HOT_UNPLUG: |
| 380 | return gb_svc_intf_hot_unplug_recv(op); |
| 381 | case GB_SVC_TYPE_INTF_RESET: |
| 382 | return gb_svc_intf_reset_recv(op); |
| 383 | default: |
| 384 | dev_err(&op->connection->dev, |
| 385 | "unsupported request: %hhu\n", type); |
| 386 | return -EINVAL; |
| 387 | } |
| 388 | } |
| 389 | |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 390 | static int gb_svc_connection_init(struct gb_connection *connection) |
| 391 | { |
| 392 | struct gb_svc *svc; |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 393 | |
| 394 | svc = kzalloc(sizeof(*svc), GFP_KERNEL); |
| 395 | if (!svc) |
| 396 | return -ENOMEM; |
| 397 | |
| 398 | svc->connection = connection; |
| 399 | connection->private = svc; |
Viresh Kumar | d3d4484 | 2015-07-21 17:44:18 +0530 | [diff] [blame] | 400 | |
| 401 | /* |
| 402 | * SVC connection is created twice: |
| 403 | * - before the interface-id of the AP and the endo type is known. |
| 404 | * - after receiving endo type and interface-id of the AP from the SVC. |
| 405 | * |
| 406 | * We should do light-weight initialization for the first case. |
| 407 | */ |
| 408 | if (!connection->bundle) { |
| 409 | WARN_ON(connection->hd->initial_svc_connection); |
| 410 | connection->hd->initial_svc_connection = connection; |
| 411 | return 0; |
| 412 | } |
| 413 | |
| 414 | ida_init(&greybus_svc_device_id_map); |
| 415 | |
Viresh Kumar | 6ceb8fd | 2015-07-03 17:00:30 +0530 | [diff] [blame] | 416 | /* Set interface's svc connection */ |
| 417 | connection->bundle->intf->svc = svc; |
| 418 | |
Viresh Kumar | 18d777c | 2015-07-21 17:44:20 +0530 | [diff] [blame^] | 419 | return 0; |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 420 | } |
| 421 | |
| 422 | static void gb_svc_connection_exit(struct gb_connection *connection) |
| 423 | { |
| 424 | struct gb_svc *svc = connection->private; |
| 425 | |
Viresh Kumar | d3d4484 | 2015-07-21 17:44:18 +0530 | [diff] [blame] | 426 | if (connection->hd->initial_svc_connection == connection) { |
| 427 | connection->hd->initial_svc_connection = NULL; |
| 428 | } else { |
| 429 | if (WARN_ON(connection->bundle->intf->svc != svc)) |
| 430 | return; |
| 431 | connection->bundle->intf->svc = NULL; |
| 432 | } |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 433 | |
Viresh Kumar | d3d4484 | 2015-07-21 17:44:18 +0530 | [diff] [blame] | 434 | connection->private = NULL; |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 435 | kfree(svc); |
| 436 | } |
| 437 | |
| 438 | static struct gb_protocol svc_protocol = { |
| 439 | .name = "svc", |
| 440 | .id = GREYBUS_PROTOCOL_SVC, |
Viresh Kumar | 06e305f | 2015-07-01 12:13:51 +0530 | [diff] [blame] | 441 | .major = GB_SVC_VERSION_MAJOR, |
| 442 | .minor = GB_SVC_VERSION_MINOR, |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 443 | .connection_init = gb_svc_connection_init, |
| 444 | .connection_exit = gb_svc_connection_exit, |
| 445 | .request_recv = gb_svc_request_recv, |
| 446 | }; |
Viresh Kumar | ab69c4c | 2015-07-03 17:00:29 +0530 | [diff] [blame] | 447 | gb_builtin_protocol_driver(svc_protocol); |