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 | |
Viresh Kumar | 067906f | 2015-08-06 12:44:55 +0530 | [diff] [blame] | 10 | #include <linux/workqueue.h> |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 11 | |
Viresh Kumar | f66427a | 2015-09-02 21:27:13 +0530 | [diff] [blame] | 12 | #include "greybus.h" |
| 13 | |
Perry Hung | 0b22649 | 2015-07-24 19:02:34 -0400 | [diff] [blame] | 14 | #define CPORT_FLAGS_E2EFC (1) |
| 15 | #define CPORT_FLAGS_CSD_N (2) |
| 16 | #define CPORT_FLAGS_CSV_N (4) |
| 17 | |
Viresh Kumar | 3ccb160 | 2015-09-03 15:42:22 +0530 | [diff] [blame] | 18 | enum gb_svc_state { |
| 19 | GB_SVC_STATE_RESET, |
| 20 | GB_SVC_STATE_PROTOCOL_VERSION, |
| 21 | GB_SVC_STATE_SVC_HELLO, |
| 22 | }; |
| 23 | |
Viresh Kumar | b45864d | 2015-07-24 15:32:21 +0530 | [diff] [blame] | 24 | struct gb_svc { |
| 25 | struct gb_connection *connection; |
Viresh Kumar | 3ccb160 | 2015-09-03 15:42:22 +0530 | [diff] [blame] | 26 | enum gb_svc_state state; |
Johan Hovold | c09db18 | 2015-09-15 09:18:08 +0200 | [diff] [blame] | 27 | struct ida device_id_map; |
Viresh Kumar | b45864d | 2015-07-24 15:32:21 +0530 | [diff] [blame] | 28 | }; |
| 29 | |
Viresh Kumar | 067906f | 2015-08-06 12:44:55 +0530 | [diff] [blame] | 30 | struct svc_hotplug { |
| 31 | struct work_struct work; |
| 32 | struct gb_connection *connection; |
| 33 | struct gb_svc_intf_hotplug_request data; |
| 34 | }; |
| 35 | |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 36 | |
Viresh Kumar | d3d4484 | 2015-07-21 17:44:18 +0530 | [diff] [blame] | 37 | /* |
| 38 | * AP's SVC cport is required early to get messages from the SVC. This happens |
| 39 | * even before the Endo is created and hence any modules or interfaces. |
| 40 | * |
| 41 | * This is a temporary connection, used only at initial bootup. |
| 42 | */ |
| 43 | struct gb_connection * |
| 44 | gb_ap_svc_connection_create(struct greybus_host_device *hd) |
| 45 | { |
| 46 | struct gb_connection *connection; |
| 47 | |
| 48 | connection = gb_connection_create_range(hd, NULL, hd->parent, |
| 49 | GB_SVC_CPORT_ID, |
| 50 | GREYBUS_PROTOCOL_SVC, |
| 51 | GB_SVC_CPORT_ID, |
| 52 | GB_SVC_CPORT_ID + 1); |
| 53 | |
| 54 | return connection; |
| 55 | } |
Viresh Kumar | d3d4484 | 2015-07-21 17:44:18 +0530 | [diff] [blame] | 56 | |
| 57 | /* |
| 58 | * We know endo-type and AP's interface id now, lets create a proper svc |
| 59 | * connection (and its interface/bundle) now and get rid of the initial |
| 60 | * 'partially' initialized one svc connection. |
| 61 | */ |
| 62 | static struct gb_interface * |
| 63 | gb_ap_interface_create(struct greybus_host_device *hd, |
| 64 | struct gb_connection *connection, u8 interface_id) |
| 65 | { |
| 66 | struct gb_interface *intf; |
| 67 | struct device *dev = &hd->endo->dev; |
Viresh Kumar | d3d4484 | 2015-07-21 17:44:18 +0530 | [diff] [blame] | 68 | |
| 69 | intf = gb_interface_create(hd, interface_id); |
| 70 | if (!intf) { |
| 71 | dev_err(dev, "%s: Failed to create interface with id %hhu\n", |
| 72 | __func__, interface_id); |
| 73 | return NULL; |
| 74 | } |
| 75 | |
| 76 | intf->device_id = GB_DEVICE_ID_AP; |
Viresh Kumar | 67c93ae | 2015-07-24 15:32:19 +0530 | [diff] [blame] | 77 | svc_update_connection(intf, connection); |
Viresh Kumar | d3d4484 | 2015-07-21 17:44:18 +0530 | [diff] [blame] | 78 | |
Viresh Kumar | dcd0500 | 2015-07-24 15:32:20 +0530 | [diff] [blame] | 79 | /* Its no longer a partially initialized connection */ |
| 80 | hd->initial_svc_connection = NULL; |
| 81 | |
Viresh Kumar | d3d4484 | 2015-07-21 17:44:18 +0530 | [diff] [blame] | 82 | return intf; |
| 83 | } |
| 84 | |
Viresh Kumar | 505f16c | 2015-08-31 17:21:07 +0530 | [diff] [blame] | 85 | static int gb_svc_intf_device_id(struct gb_svc *svc, u8 intf_id, u8 device_id) |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 86 | { |
| 87 | struct gb_svc_intf_device_id_request request; |
| 88 | |
| 89 | request.intf_id = intf_id; |
| 90 | request.device_id = device_id; |
| 91 | |
| 92 | return gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_DEVICE_ID, |
| 93 | &request, sizeof(request), NULL, 0); |
| 94 | } |
| 95 | |
Viresh Kumar | 3f0e918 | 2015-08-31 17:21:06 +0530 | [diff] [blame] | 96 | int gb_svc_intf_reset(struct gb_svc *svc, u8 intf_id) |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 97 | { |
| 98 | struct gb_svc_intf_reset_request request; |
| 99 | |
| 100 | request.intf_id = intf_id; |
| 101 | |
| 102 | return gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_RESET, |
| 103 | &request, sizeof(request), NULL, 0); |
| 104 | } |
Viresh Kumar | 3f0e918 | 2015-08-31 17:21:06 +0530 | [diff] [blame] | 105 | EXPORT_SYMBOL_GPL(gb_svc_intf_reset); |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 106 | |
Viresh Kumar | 19151c3 | 2015-09-09 21:08:29 +0530 | [diff] [blame] | 107 | int gb_svc_dme_peer_get(struct gb_svc *svc, u8 intf_id, u16 attr, u16 selector, |
| 108 | u32 *value) |
| 109 | { |
| 110 | struct gb_svc_dme_peer_get_request request; |
| 111 | struct gb_svc_dme_peer_get_response response; |
| 112 | u16 result; |
| 113 | int ret; |
| 114 | |
| 115 | request.intf_id = intf_id; |
| 116 | request.attr = cpu_to_le16(attr); |
| 117 | request.selector = cpu_to_le16(selector); |
| 118 | |
| 119 | ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_DME_PEER_GET, |
| 120 | &request, sizeof(request), |
| 121 | &response, sizeof(response)); |
| 122 | if (ret) { |
| 123 | dev_err(&svc->connection->dev, |
| 124 | "failed to get DME attribute (%hhu %hx %hu) %d\n", |
| 125 | intf_id, attr, selector, ret); |
| 126 | return ret; |
| 127 | } |
| 128 | |
| 129 | result = le16_to_cpu(response.result_code); |
| 130 | if (result) { |
| 131 | dev_err(&svc->connection->dev, |
| 132 | "Unipro error %hu while getting DME attribute (%hhu %hx %hu)\n", |
| 133 | result, intf_id, attr, selector); |
| 134 | return -EINVAL; |
| 135 | } |
| 136 | |
| 137 | if (value) |
| 138 | *value = le32_to_cpu(response.attr_value); |
| 139 | |
| 140 | return 0; |
| 141 | } |
| 142 | EXPORT_SYMBOL_GPL(gb_svc_dme_peer_get); |
| 143 | |
| 144 | int gb_svc_dme_peer_set(struct gb_svc *svc, u8 intf_id, u16 attr, u16 selector, |
| 145 | u32 value) |
| 146 | { |
| 147 | struct gb_svc_dme_peer_set_request request; |
| 148 | struct gb_svc_dme_peer_set_response response; |
| 149 | u16 result; |
| 150 | int ret; |
| 151 | |
| 152 | request.intf_id = intf_id; |
| 153 | request.attr = cpu_to_le16(attr); |
| 154 | request.selector = cpu_to_le16(selector); |
| 155 | request.value = cpu_to_le32(value); |
| 156 | |
| 157 | ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_DME_PEER_SET, |
| 158 | &request, sizeof(request), |
| 159 | &response, sizeof(response)); |
| 160 | if (ret) { |
| 161 | dev_err(&svc->connection->dev, |
| 162 | "failed to set DME attribute (%hhu %hx %hu %u) %d\n", |
| 163 | intf_id, attr, selector, value, ret); |
| 164 | return ret; |
| 165 | } |
| 166 | |
| 167 | result = le16_to_cpu(response.result_code); |
| 168 | if (result) { |
| 169 | dev_err(&svc->connection->dev, |
| 170 | "Unipro error %hu while setting DME attribute (%hhu %hx %hu %u)\n", |
| 171 | result, intf_id, attr, selector, value); |
| 172 | return -EINVAL; |
| 173 | } |
| 174 | |
| 175 | return 0; |
| 176 | } |
| 177 | EXPORT_SYMBOL_GPL(gb_svc_dme_peer_set); |
| 178 | |
Viresh Kumar | 3f0e918 | 2015-08-31 17:21:06 +0530 | [diff] [blame] | 179 | int gb_svc_connection_create(struct gb_svc *svc, |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 180 | u8 intf1_id, u16 cport1_id, |
| 181 | u8 intf2_id, u16 cport2_id) |
| 182 | { |
| 183 | struct gb_svc_conn_create_request request; |
| 184 | |
| 185 | request.intf1_id = intf1_id; |
| 186 | request.cport1_id = cport1_id; |
| 187 | request.intf2_id = intf2_id; |
| 188 | request.cport2_id = cport2_id; |
Perry Hung | 0b22649 | 2015-07-24 19:02:34 -0400 | [diff] [blame] | 189 | /* |
| 190 | * XXX: fix connections paramaters to TC0 and all CPort flags |
| 191 | * for now. |
| 192 | */ |
| 193 | request.tc = 0; |
| 194 | request.flags = CPORT_FLAGS_CSV_N | CPORT_FLAGS_E2EFC; |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 195 | |
| 196 | return gb_operation_sync(svc->connection, GB_SVC_TYPE_CONN_CREATE, |
| 197 | &request, sizeof(request), NULL, 0); |
| 198 | } |
Viresh Kumar | 3f0e918 | 2015-08-31 17:21:06 +0530 | [diff] [blame] | 199 | EXPORT_SYMBOL_GPL(gb_svc_connection_create); |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 200 | |
Viresh Kumar | 3f0e918 | 2015-08-31 17:21:06 +0530 | [diff] [blame] | 201 | void gb_svc_connection_destroy(struct gb_svc *svc, u8 intf1_id, u16 cport1_id, |
| 202 | u8 intf2_id, u16 cport2_id) |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 203 | { |
| 204 | struct gb_svc_conn_destroy_request request; |
Viresh Kumar | d9fcfff | 2015-08-31 17:21:05 +0530 | [diff] [blame] | 205 | struct gb_connection *connection = svc->connection; |
| 206 | int ret; |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 207 | |
| 208 | request.intf1_id = intf1_id; |
| 209 | request.cport1_id = cport1_id; |
| 210 | request.intf2_id = intf2_id; |
| 211 | request.cport2_id = cport2_id; |
| 212 | |
Viresh Kumar | d9fcfff | 2015-08-31 17:21:05 +0530 | [diff] [blame] | 213 | ret = gb_operation_sync(connection, GB_SVC_TYPE_CONN_DESTROY, |
| 214 | &request, sizeof(request), NULL, 0); |
| 215 | if (ret) { |
| 216 | dev_err(&connection->dev, |
| 217 | "failed to destroy connection (%hhx:%hx %hhx:%hx) %d\n", |
| 218 | intf1_id, cport1_id, intf2_id, cport2_id, ret); |
| 219 | } |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 220 | } |
Viresh Kumar | 3f0e918 | 2015-08-31 17:21:06 +0530 | [diff] [blame] | 221 | EXPORT_SYMBOL_GPL(gb_svc_connection_destroy); |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 222 | |
Viresh Kumar | bb10685 | 2015-09-07 16:01:25 +0530 | [diff] [blame] | 223 | /* Creates bi-directional routes between the devices */ |
Viresh Kumar | 505f16c | 2015-08-31 17:21:07 +0530 | [diff] [blame] | 224 | static int gb_svc_route_create(struct gb_svc *svc, u8 intf1_id, u8 dev1_id, |
| 225 | u8 intf2_id, u8 dev2_id) |
Perry Hung | e08aaa4 | 2015-07-24 19:02:31 -0400 | [diff] [blame] | 226 | { |
| 227 | struct gb_svc_route_create_request request; |
| 228 | |
| 229 | request.intf1_id = intf1_id; |
| 230 | request.dev1_id = dev1_id; |
| 231 | request.intf2_id = intf2_id; |
| 232 | request.dev2_id = dev2_id; |
| 233 | |
| 234 | return gb_operation_sync(svc->connection, GB_SVC_TYPE_ROUTE_CREATE, |
| 235 | &request, sizeof(request), NULL, 0); |
| 236 | } |
Perry Hung | e08aaa4 | 2015-07-24 19:02:31 -0400 | [diff] [blame] | 237 | |
Viresh Kumar | 0a02057 | 2015-09-07 18:05:26 +0530 | [diff] [blame] | 238 | /* Destroys bi-directional routes between the devices */ |
| 239 | static void gb_svc_route_destroy(struct gb_svc *svc, u8 intf1_id, u8 intf2_id) |
| 240 | { |
| 241 | struct gb_svc_route_destroy_request request; |
| 242 | int ret; |
| 243 | |
| 244 | request.intf1_id = intf1_id; |
| 245 | request.intf2_id = intf2_id; |
| 246 | |
| 247 | ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_ROUTE_DESTROY, |
| 248 | &request, sizeof(request), NULL, 0); |
| 249 | if (ret) { |
| 250 | dev_err(&svc->connection->dev, |
| 251 | "failed to destroy route (%hhx %hhx) %d\n", |
| 252 | intf1_id, intf2_id, ret); |
| 253 | } |
| 254 | } |
| 255 | |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 256 | static int gb_svc_version_request(struct gb_operation *op) |
| 257 | { |
| 258 | struct gb_connection *connection = op->connection; |
| 259 | struct gb_protocol_version_response *version; |
| 260 | struct device *dev = &connection->dev; |
| 261 | |
| 262 | version = op->request->payload; |
| 263 | |
| 264 | if (version->major > GB_SVC_VERSION_MAJOR) { |
| 265 | dev_err(&connection->dev, |
| 266 | "unsupported major version (%hhu > %hhu)\n", |
| 267 | version->major, GB_SVC_VERSION_MAJOR); |
| 268 | return -ENOTSUPP; |
| 269 | } |
| 270 | |
Viresh Kumar | 3ea959e3 | 2015-08-11 07:36:14 +0530 | [diff] [blame] | 271 | connection->module_major = version->major; |
| 272 | connection->module_minor = version->minor; |
| 273 | |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 274 | if (!gb_operation_response_alloc(op, sizeof(*version), GFP_KERNEL)) { |
| 275 | dev_err(dev, "%s: error allocating response\n", |
| 276 | __func__); |
| 277 | return -ENOMEM; |
| 278 | } |
| 279 | |
| 280 | version = op->response->payload; |
Johan Hovold | 5983293 | 2015-09-15 10:48:00 +0200 | [diff] [blame^] | 281 | version->major = connection->module_major; |
| 282 | version->minor = connection->module_minor; |
| 283 | |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 284 | return 0; |
| 285 | } |
| 286 | |
| 287 | static int gb_svc_hello(struct gb_operation *op) |
| 288 | { |
| 289 | struct gb_connection *connection = op->connection; |
| 290 | struct greybus_host_device *hd = connection->hd; |
| 291 | struct gb_svc_hello_request *hello_request; |
| 292 | struct device *dev = &connection->dev; |
| 293 | struct gb_interface *intf; |
| 294 | u16 endo_id; |
| 295 | u8 interface_id; |
| 296 | int ret; |
| 297 | |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 298 | /* |
| 299 | * SVC sends information about the endo and interface-id on the hello |
| 300 | * request, use that to create an endo. |
| 301 | */ |
Viresh Kumar | 0c32d2a | 2015-08-11 07:29:19 +0530 | [diff] [blame] | 302 | if (op->request->payload_size < sizeof(*hello_request)) { |
| 303 | dev_err(dev, "%s: Illegal size of hello request (%zu < %zu)\n", |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 304 | __func__, op->request->payload_size, |
| 305 | sizeof(*hello_request)); |
| 306 | return -EINVAL; |
| 307 | } |
| 308 | |
| 309 | hello_request = op->request->payload; |
| 310 | endo_id = le16_to_cpu(hello_request->endo_id); |
| 311 | interface_id = hello_request->interface_id; |
| 312 | |
| 313 | /* Setup Endo */ |
| 314 | ret = greybus_endo_setup(hd, endo_id, interface_id); |
| 315 | if (ret) |
| 316 | return ret; |
| 317 | |
| 318 | /* |
| 319 | * Endo and its modules are ready now, fix AP's partially initialized |
| 320 | * svc protocol and its connection. |
| 321 | */ |
| 322 | intf = gb_ap_interface_create(hd, connection, interface_id); |
| 323 | if (!intf) { |
| 324 | gb_endo_remove(hd->endo); |
| 325 | return ret; |
| 326 | } |
| 327 | |
| 328 | return 0; |
| 329 | } |
| 330 | |
Viresh Kumar | 067906f | 2015-08-06 12:44:55 +0530 | [diff] [blame] | 331 | /* |
| 332 | * 'struct svc_hotplug' should be freed by svc_process_hotplug() before it |
| 333 | * returns, irrespective of success or Failure in bringing up the module. |
| 334 | */ |
| 335 | static void svc_process_hotplug(struct work_struct *work) |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 336 | { |
Viresh Kumar | 067906f | 2015-08-06 12:44:55 +0530 | [diff] [blame] | 337 | struct svc_hotplug *svc_hotplug = container_of(work, struct svc_hotplug, |
| 338 | work); |
| 339 | struct gb_svc_intf_hotplug_request *hotplug = &svc_hotplug->data; |
| 340 | struct gb_connection *connection = svc_hotplug->connection; |
| 341 | struct gb_svc *svc = connection->private; |
Viresh Kumar | b9fb704 | 2015-09-01 17:16:16 +0530 | [diff] [blame] | 342 | struct greybus_host_device *hd = connection->hd; |
Viresh Kumar | 067906f | 2015-08-06 12:44:55 +0530 | [diff] [blame] | 343 | struct device *dev = &connection->dev; |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 344 | struct gb_interface *intf; |
| 345 | u8 intf_id, device_id; |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 346 | int ret; |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 347 | |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 348 | /* |
| 349 | * Grab the information we need. |
Viresh Kumar | 7eb8919 | 2015-07-01 12:13:50 +0530 | [diff] [blame] | 350 | */ |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 351 | intf_id = hotplug->intf_id; |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 352 | |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 353 | intf = gb_interface_create(hd, intf_id); |
| 354 | if (!intf) { |
| 355 | dev_err(dev, "%s: Failed to create interface with id %hhu\n", |
| 356 | __func__, intf_id); |
Viresh Kumar | 067906f | 2015-08-06 12:44:55 +0530 | [diff] [blame] | 357 | goto free_svc_hotplug; |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 358 | } |
| 359 | |
Viresh Kumar | 3944a45 | 2015-08-12 09:19:31 +0530 | [diff] [blame] | 360 | intf->unipro_mfg_id = le32_to_cpu(hotplug->data.unipro_mfg_id); |
| 361 | intf->unipro_prod_id = le32_to_cpu(hotplug->data.unipro_prod_id); |
| 362 | intf->ara_vend_id = le32_to_cpu(hotplug->data.ara_vend_id); |
| 363 | intf->ara_prod_id = le32_to_cpu(hotplug->data.ara_prod_id); |
| 364 | |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 365 | /* |
| 366 | * Create a device id for the interface: |
| 367 | * - device id 0 (GB_DEVICE_ID_SVC) belongs to the SVC |
| 368 | * - device id 1 (GB_DEVICE_ID_AP) belongs to the AP |
| 369 | * |
| 370 | * XXX Do we need to allocate device ID for SVC or the AP here? And what |
| 371 | * XXX about an AP with multiple interface blocks? |
| 372 | */ |
Johan Hovold | c09db18 | 2015-09-15 09:18:08 +0200 | [diff] [blame] | 373 | device_id = ida_simple_get(&svc->device_id_map, |
Johan Hovold | 89f637f | 2015-09-01 12:25:25 +0200 | [diff] [blame] | 374 | GB_DEVICE_ID_MODULES_START, 0, GFP_KERNEL); |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 375 | if (device_id < 0) { |
| 376 | ret = device_id; |
| 377 | dev_err(dev, "%s: Failed to allocate device id for interface with id %hhu (%d)\n", |
| 378 | __func__, intf_id, ret); |
| 379 | goto destroy_interface; |
| 380 | } |
| 381 | |
Viresh Kumar | 3f0e918 | 2015-08-31 17:21:06 +0530 | [diff] [blame] | 382 | ret = gb_svc_intf_device_id(svc, intf_id, device_id); |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 383 | if (ret) { |
| 384 | dev_err(dev, "%s: Device id operation failed, interface %hhu device_id %hhu (%d)\n", |
| 385 | __func__, intf_id, device_id, ret); |
| 386 | goto ida_put; |
| 387 | } |
| 388 | |
Perry Hung | 7e27546 | 2015-07-24 19:02:32 -0400 | [diff] [blame] | 389 | /* |
| 390 | * Create a two-way route between the AP and the new interface |
| 391 | */ |
Viresh Kumar | 3f0e918 | 2015-08-31 17:21:06 +0530 | [diff] [blame] | 392 | ret = gb_svc_route_create(svc, hd->endo->ap_intf_id, GB_DEVICE_ID_AP, |
| 393 | intf_id, device_id); |
Perry Hung | 7e27546 | 2015-07-24 19:02:32 -0400 | [diff] [blame] | 394 | if (ret) { |
| 395 | dev_err(dev, "%s: Route create operation failed, interface %hhu device_id %hhu (%d)\n", |
| 396 | __func__, intf_id, device_id, ret); |
Viresh Kumar | 0a02057 | 2015-09-07 18:05:26 +0530 | [diff] [blame] | 397 | goto svc_id_free; |
Perry Hung | 7e27546 | 2015-07-24 19:02:32 -0400 | [diff] [blame] | 398 | } |
| 399 | |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 400 | ret = gb_interface_init(intf, device_id); |
| 401 | if (ret) { |
| 402 | dev_err(dev, "%s: Failed to initialize interface, interface %hhu device_id %hhu (%d)\n", |
| 403 | __func__, intf_id, device_id, ret); |
Viresh Kumar | 0a02057 | 2015-09-07 18:05:26 +0530 | [diff] [blame] | 404 | goto destroy_route; |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 405 | } |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 406 | |
Viresh Kumar | 067906f | 2015-08-06 12:44:55 +0530 | [diff] [blame] | 407 | goto free_svc_hotplug; |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 408 | |
Viresh Kumar | 0a02057 | 2015-09-07 18:05:26 +0530 | [diff] [blame] | 409 | destroy_route: |
| 410 | gb_svc_route_destroy(svc, hd->endo->ap_intf_id, intf_id); |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 411 | svc_id_free: |
| 412 | /* |
| 413 | * XXX Should we tell SVC that this id doesn't belong to interface |
| 414 | * XXX anymore. |
| 415 | */ |
| 416 | ida_put: |
Johan Hovold | c09db18 | 2015-09-15 09:18:08 +0200 | [diff] [blame] | 417 | ida_simple_remove(&svc->device_id_map, device_id); |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 418 | destroy_interface: |
| 419 | gb_interface_remove(hd, intf_id); |
Viresh Kumar | 067906f | 2015-08-06 12:44:55 +0530 | [diff] [blame] | 420 | free_svc_hotplug: |
| 421 | kfree(svc_hotplug); |
| 422 | } |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 423 | |
Viresh Kumar | 067906f | 2015-08-06 12:44:55 +0530 | [diff] [blame] | 424 | /* |
| 425 | * Bringing up a module can be time consuming, as that may require lots of |
| 426 | * initialization on the module side. Over that, we may also need to download |
| 427 | * the firmware first and flash that on the module. |
| 428 | * |
| 429 | * In order to make other hotplug events to not wait for all this to finish, |
| 430 | * handle most of module hotplug stuff outside of the hotplug callback, with |
| 431 | * help of a workqueue. |
| 432 | */ |
| 433 | static int gb_svc_intf_hotplug_recv(struct gb_operation *op) |
| 434 | { |
| 435 | struct gb_message *request = op->request; |
| 436 | struct svc_hotplug *svc_hotplug; |
| 437 | |
| 438 | if (request->payload_size < sizeof(svc_hotplug->data)) { |
| 439 | dev_err(&op->connection->dev, |
| 440 | "%s: short hotplug request received (%zu < %zu)\n", |
| 441 | __func__, request->payload_size, |
| 442 | sizeof(svc_hotplug->data)); |
| 443 | return -EINVAL; |
| 444 | } |
| 445 | |
Johan Hovold | 287bba8 | 2015-09-01 12:25:26 +0200 | [diff] [blame] | 446 | svc_hotplug = kmalloc(sizeof(*svc_hotplug), GFP_KERNEL); |
Viresh Kumar | 067906f | 2015-08-06 12:44:55 +0530 | [diff] [blame] | 447 | if (!svc_hotplug) |
| 448 | return -ENOMEM; |
| 449 | |
| 450 | svc_hotplug->connection = op->connection; |
| 451 | memcpy(&svc_hotplug->data, op->request->payload, sizeof(svc_hotplug->data)); |
| 452 | |
| 453 | INIT_WORK(&svc_hotplug->work, svc_process_hotplug); |
| 454 | queue_work(system_unbound_wq, &svc_hotplug->work); |
| 455 | |
| 456 | return 0; |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 457 | } |
| 458 | |
| 459 | static int gb_svc_intf_hot_unplug_recv(struct gb_operation *op) |
| 460 | { |
| 461 | struct gb_message *request = op->request; |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 462 | struct gb_svc_intf_hot_unplug_request *hot_unplug = request->payload; |
Viresh Kumar | b9fb704 | 2015-09-01 17:16:16 +0530 | [diff] [blame] | 463 | struct greybus_host_device *hd = op->connection->hd; |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 464 | struct device *dev = &op->connection->dev; |
Viresh Kumar | 0a02057 | 2015-09-07 18:05:26 +0530 | [diff] [blame] | 465 | struct gb_svc *svc = op->connection->private; |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 466 | u8 device_id; |
| 467 | struct gb_interface *intf; |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 468 | u8 intf_id; |
| 469 | |
| 470 | if (request->payload_size < sizeof(*hot_unplug)) { |
| 471 | dev_err(&op->connection->dev, |
Viresh Kumar | 6d05ad3 | 2015-08-06 12:44:54 +0530 | [diff] [blame] | 472 | "short hot unplug request received (%zu < %zu)\n", |
| 473 | request->payload_size, sizeof(*hot_unplug)); |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 474 | return -EINVAL; |
| 475 | } |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 476 | |
| 477 | intf_id = hot_unplug->intf_id; |
| 478 | |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 479 | intf = gb_interface_find(hd, intf_id); |
| 480 | if (!intf) { |
| 481 | dev_err(dev, "%s: Couldn't find interface for id %hhu\n", |
| 482 | __func__, intf_id); |
| 483 | return -EINVAL; |
| 484 | } |
| 485 | |
| 486 | device_id = intf->device_id; |
| 487 | gb_interface_remove(hd, intf_id); |
Viresh Kumar | 0a02057 | 2015-09-07 18:05:26 +0530 | [diff] [blame] | 488 | |
| 489 | /* |
| 490 | * Destroy the two-way route between the AP and the interface. |
| 491 | */ |
| 492 | gb_svc_route_destroy(svc, hd->endo->ap_intf_id, intf_id); |
| 493 | |
Johan Hovold | c09db18 | 2015-09-15 09:18:08 +0200 | [diff] [blame] | 494 | ida_simple_remove(&svc->device_id_map, device_id); |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 495 | |
| 496 | return 0; |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 497 | } |
| 498 | |
| 499 | static int gb_svc_intf_reset_recv(struct gb_operation *op) |
| 500 | { |
| 501 | struct gb_message *request = op->request; |
| 502 | struct gb_svc_intf_reset_request *reset; |
| 503 | u8 intf_id; |
| 504 | |
| 505 | if (request->payload_size < sizeof(*reset)) { |
| 506 | dev_err(&op->connection->dev, |
Viresh Kumar | 6d05ad3 | 2015-08-06 12:44:54 +0530 | [diff] [blame] | 507 | "short reset request received (%zu < %zu)\n", |
| 508 | request->payload_size, sizeof(*reset)); |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 509 | return -EINVAL; |
| 510 | } |
| 511 | reset = request->payload; |
| 512 | |
| 513 | intf_id = reset->intf_id; |
| 514 | |
| 515 | /* FIXME Reset the interface here */ |
| 516 | |
| 517 | return 0; |
| 518 | } |
| 519 | |
| 520 | static int gb_svc_request_recv(u8 type, struct gb_operation *op) |
| 521 | { |
Viresh Kumar | 3ccb160 | 2015-09-03 15:42:22 +0530 | [diff] [blame] | 522 | struct gb_connection *connection = op->connection; |
| 523 | struct gb_svc *svc = connection->private; |
| 524 | int ret = 0; |
| 525 | |
| 526 | /* |
| 527 | * SVC requests need to follow a specific order (at least initially) and |
| 528 | * below code takes care of enforcing that. The expected order is: |
| 529 | * - PROTOCOL_VERSION |
| 530 | * - SVC_HELLO |
| 531 | * - Any other request, but the earlier two. |
| 532 | * |
| 533 | * Incoming requests are guaranteed to be serialized and so we don't |
| 534 | * need to protect 'state' for any races. |
| 535 | */ |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 536 | switch (type) { |
Viresh Kumar | 0e2462d | 2015-08-14 07:57:38 +0530 | [diff] [blame] | 537 | case GB_REQUEST_TYPE_PROTOCOL_VERSION: |
Viresh Kumar | 3ccb160 | 2015-09-03 15:42:22 +0530 | [diff] [blame] | 538 | if (svc->state != GB_SVC_STATE_RESET) |
| 539 | ret = -EINVAL; |
| 540 | break; |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 541 | case GB_SVC_TYPE_SVC_HELLO: |
Viresh Kumar | 3ccb160 | 2015-09-03 15:42:22 +0530 | [diff] [blame] | 542 | if (svc->state != GB_SVC_STATE_PROTOCOL_VERSION) |
| 543 | ret = -EINVAL; |
| 544 | break; |
| 545 | default: |
| 546 | if (svc->state != GB_SVC_STATE_SVC_HELLO) |
| 547 | ret = -EINVAL; |
| 548 | break; |
| 549 | } |
| 550 | |
| 551 | if (ret) { |
| 552 | dev_warn(&connection->dev, |
| 553 | "unexpected SVC request 0x%02x received (state %u)\n", |
| 554 | type, svc->state); |
| 555 | return ret; |
| 556 | } |
| 557 | |
| 558 | switch (type) { |
| 559 | case GB_REQUEST_TYPE_PROTOCOL_VERSION: |
| 560 | ret = gb_svc_version_request(op); |
| 561 | if (!ret) |
| 562 | svc->state = GB_SVC_STATE_PROTOCOL_VERSION; |
| 563 | return ret; |
| 564 | case GB_SVC_TYPE_SVC_HELLO: |
| 565 | ret = gb_svc_hello(op); |
| 566 | if (!ret) |
| 567 | svc->state = GB_SVC_STATE_SVC_HELLO; |
| 568 | return ret; |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 569 | case GB_SVC_TYPE_INTF_HOTPLUG: |
| 570 | return gb_svc_intf_hotplug_recv(op); |
| 571 | case GB_SVC_TYPE_INTF_HOT_UNPLUG: |
| 572 | return gb_svc_intf_hot_unplug_recv(op); |
| 573 | case GB_SVC_TYPE_INTF_RESET: |
| 574 | return gb_svc_intf_reset_recv(op); |
| 575 | default: |
| 576 | dev_err(&op->connection->dev, |
| 577 | "unsupported request: %hhu\n", type); |
| 578 | return -EINVAL; |
| 579 | } |
| 580 | } |
| 581 | |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 582 | static int gb_svc_connection_init(struct gb_connection *connection) |
| 583 | { |
| 584 | struct gb_svc *svc; |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 585 | |
| 586 | svc = kzalloc(sizeof(*svc), GFP_KERNEL); |
| 587 | if (!svc) |
| 588 | return -ENOMEM; |
| 589 | |
Perry Hung | 75a60ed | 2015-07-24 19:02:33 -0400 | [diff] [blame] | 590 | connection->hd->svc = svc; |
Viresh Kumar | 3ccb160 | 2015-09-03 15:42:22 +0530 | [diff] [blame] | 591 | svc->state = GB_SVC_STATE_RESET; |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 592 | svc->connection = connection; |
| 593 | connection->private = svc; |
Viresh Kumar | d3d4484 | 2015-07-21 17:44:18 +0530 | [diff] [blame] | 594 | |
Viresh Kumar | dcd0500 | 2015-07-24 15:32:20 +0530 | [diff] [blame] | 595 | WARN_ON(connection->hd->initial_svc_connection); |
| 596 | connection->hd->initial_svc_connection = connection; |
Viresh Kumar | d3d4484 | 2015-07-21 17:44:18 +0530 | [diff] [blame] | 597 | |
Johan Hovold | c09db18 | 2015-09-15 09:18:08 +0200 | [diff] [blame] | 598 | ida_init(&svc->device_id_map); |
Viresh Kumar | d3d4484 | 2015-07-21 17:44:18 +0530 | [diff] [blame] | 599 | |
Viresh Kumar | 18d777c | 2015-07-21 17:44:20 +0530 | [diff] [blame] | 600 | return 0; |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 601 | } |
| 602 | |
| 603 | static void gb_svc_connection_exit(struct gb_connection *connection) |
| 604 | { |
| 605 | struct gb_svc *svc = connection->private; |
| 606 | |
Johan Hovold | c09db18 | 2015-09-15 09:18:08 +0200 | [diff] [blame] | 607 | ida_destroy(&svc->device_id_map); |
Perry Hung | 75a60ed | 2015-07-24 19:02:33 -0400 | [diff] [blame] | 608 | connection->hd->svc = NULL; |
Viresh Kumar | d3d4484 | 2015-07-21 17:44:18 +0530 | [diff] [blame] | 609 | connection->private = NULL; |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 610 | kfree(svc); |
| 611 | } |
| 612 | |
| 613 | static struct gb_protocol svc_protocol = { |
| 614 | .name = "svc", |
| 615 | .id = GREYBUS_PROTOCOL_SVC, |
Viresh Kumar | 06e305f | 2015-07-01 12:13:51 +0530 | [diff] [blame] | 616 | .major = GB_SVC_VERSION_MAJOR, |
| 617 | .minor = GB_SVC_VERSION_MINOR, |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 618 | .connection_init = gb_svc_connection_init, |
| 619 | .connection_exit = gb_svc_connection_exit, |
| 620 | .request_recv = gb_svc_request_recv, |
Viresh Kumar | 5a5296b | 2015-09-07 16:01:24 +0530 | [diff] [blame] | 621 | .flags = GB_PROTOCOL_SKIP_CONTROL_CONNECTED | |
| 622 | GB_PROTOCOL_SKIP_CONTROL_DISCONNECTED | |
| 623 | GB_PROTOCOL_NO_BUNDLE | |
| 624 | GB_PROTOCOL_SKIP_VERSION | |
| 625 | GB_PROTOCOL_SKIP_SVC_CONNECTION, |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 626 | }; |
Viresh Kumar | ab69c4c | 2015-07-03 17:00:29 +0530 | [diff] [blame] | 627 | gb_builtin_protocol_driver(svc_protocol); |