drivers/ps3/ps3-sys-manager.c

   1 /*
   2  *  PS3 System Manager.
   3  *
   4  *  Copyright (C) 2007 Sony Computer Entertainment Inc.
   5  *  Copyright 2007 Sony Corp.
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; version 2 of the License.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include <linux/kernel.h>
  22 #include <linux/module.h>
  23 #include <linux/workqueue.h>
  24 #include <linux/reboot.h>
  25
  26 #include <asm/firmware.h>
  27 #include <asm/ps3.h>
  28
  29 #include "vuart.h"
  30
  31 /**
  32  * ps3_sys_manager - PS3 system manager driver.
  33  *
  34  * The system manager provides an asynchronous system event notification
  35  * mechanism for reporting events like thermal alert and button presses to
  36  * guests.  It also provides support to control system shutdown and startup.
  37  *
  38  * The actual system manager is implemented as an application running in the
  39  * system policy module in lpar_1.  Guests communicate with the system manager
  40  * through port 2 of the vuart using a simple packet message protocol.
  41  * Messages are comprised of a fixed field header followed by a message
  42  * specific payload.
  43  */
  44
  45 /**
  46  * struct ps3_sys_manager_header - System manager message header.
  47  * @version: Header version, currently 1.
  48  * @size: Header size in bytes, curently 16.
  49  * @payload_size: Message payload size in bytes.
  50  * @service_id: Message type, one of enum ps3_sys_manager_service_id.
  51  * @request_tag: Unique number to identify reply.
  52  */
  53
  54 struct ps3_sys_manager_header {
  55         /* version 1 */
  56         u8 version;
  57         u8 size;
  58         u16 reserved_1;
  59         u32 payload_size;
  60         u16 service_id;
  61         u16 reserved_2;
  62         u32 request_tag;
  63 };
  64
  65 #define dump_sm_header(_h) _dump_sm_header(_h, __func__, __LINE__)
  66 static void __maybe_unused _dump_sm_header(
  67         const struct ps3_sys_manager_header *h, const char *func, int line)
  68 {
  69         pr_debug("%s:%d: version:      %xh\n", func, line, h->version);
  70         pr_debug("%s:%d: size:         %xh\n", func, line, h->size);
  71         pr_debug("%s:%d: payload_size: %xh\n", func, line, h->payload_size);
  72         pr_debug("%s:%d: service_id:   %xh\n", func, line, h->service_id);
  73         pr_debug("%s:%d: request_tag:  %xh\n", func, line, h->request_tag);
  74 }
  75
  76 /**
  77  * @PS3_SM_RX_MSG_LEN_MIN - Shortest received message length.
  78  * @PS3_SM_RX_MSG_LEN_MAX - Longest received message length.
  79  *
  80  * Currently all messages received from the system manager are either
  81  * (16 bytes header + 8 bytes payload = 24 bytes) or (16 bytes header
  82  * + 16 bytes payload = 32 bytes).  This knowlege is used to simplify
  83  * the logic.
  84  */
  85
  86 enum {
  87         PS3_SM_RX_MSG_LEN_MIN = 24,
  88         PS3_SM_RX_MSG_LEN_MAX = 32,
  89 };
  90
  91 /**
  92  * enum ps3_sys_manager_service_id - Message header service_id.
  93  * @PS3_SM_SERVICE_ID_REQUEST:       guest --> sys_manager.
  94  * @PS3_SM_SERVICE_ID_REQUEST_ERROR: guest <-- sys_manager.
  95  * @PS3_SM_SERVICE_ID_COMMAND:       guest <-- sys_manager.
  96  * @PS3_SM_SERVICE_ID_RESPONSE:      guest --> sys_manager.
  97  * @PS3_SM_SERVICE_ID_SET_ATTR:      guest --> sys_manager.
  98  * @PS3_SM_SERVICE_ID_EXTERN_EVENT:  guest <-- sys_manager.
  99  * @PS3_SM_SERVICE_ID_SET_NEXT_OP:   guest --> sys_manager.
 100  *
 101  * PS3_SM_SERVICE_ID_REQUEST_ERROR is returned for invalid data values in a
 102  * a PS3_SM_SERVICE_ID_REQUEST message.  It also seems to be returned when
 103  * a REQUEST message is sent at the wrong time.
 104  */
 105
 106 enum ps3_sys_manager_service_id {
 107         /* version 1 */
 108         PS3_SM_SERVICE_ID_REQUEST = 1,
 109         PS3_SM_SERVICE_ID_RESPONSE = 2,
 110         PS3_SM_SERVICE_ID_COMMAND = 3,
 111         PS3_SM_SERVICE_ID_EXTERN_EVENT = 4,
 112         PS3_SM_SERVICE_ID_SET_NEXT_OP = 5,
 113         PS3_SM_SERVICE_ID_REQUEST_ERROR = 6,
 114         PS3_SM_SERVICE_ID_SET_ATTR = 8,
 115 };
 116
 117 /**
 118  * enum ps3_sys_manager_attr - Notification attribute (bit position mask).
 119  * @PS3_SM_ATTR_POWER: Power button.
 120  * @PS3_SM_ATTR_RESET: Reset button, not available on retail console.
 121  * @PS3_SM_ATTR_THERMAL: Sytem thermal alert.
 122  * @PS3_SM_ATTR_CONTROLLER: Remote controller event.
 123  * @PS3_SM_ATTR_ALL: Logical OR of all.
 124  *
 125  * The guest tells the system manager which events it is interested in receiving
 126  * notice of by sending the system manager a logical OR of notification
 127  * attributes via the ps3_sys_manager_send_attr() routine.
 128  */
 129
 130 enum ps3_sys_manager_attr {
 131         /* version 1 */
 132         PS3_SM_ATTR_POWER = 1,
 133         PS3_SM_ATTR_RESET = 2,
 134         PS3_SM_ATTR_THERMAL = 4,
 135         PS3_SM_ATTR_CONTROLLER = 8, /* bogus? */
 136         PS3_SM_ATTR_ALL = 0x0f,
 137 };
 138
 139 /**
 140  * enum ps3_sys_manager_event - External event type, reported by system manager.
 141  * @PS3_SM_EVENT_POWER_PRESSED: payload.value =
 142  *  enum ps3_sys_manager_button_event.
 143  * @PS3_SM_EVENT_POWER_RELEASED: payload.value = time pressed in millisec.
 144  * @PS3_SM_EVENT_RESET_PRESSED: payload.value =
 145  *  enum ps3_sys_manager_button_event.
 146  * @PS3_SM_EVENT_RESET_RELEASED: payload.value = time pressed in millisec.
 147  * @PS3_SM_EVENT_THERMAL_ALERT: payload.value = thermal zone id.
 148  * @PS3_SM_EVENT_THERMAL_CLEARED: payload.value = thermal zone id.
 149  */
 150
 151 enum ps3_sys_manager_event {
 152         /* version 1 */
 153         PS3_SM_EVENT_POWER_PRESSED = 3,
 154         PS3_SM_EVENT_POWER_RELEASED = 4,
 155         PS3_SM_EVENT_RESET_PRESSED = 5,
 156         PS3_SM_EVENT_RESET_RELEASED = 6,
 157         PS3_SM_EVENT_THERMAL_ALERT = 7,
 158         PS3_SM_EVENT_THERMAL_CLEARED = 8,
 159         /* no info on controller events */
 160 };
 161
 162 /**
 163  * enum ps3_sys_manager_button_event - Button event payload values.
 164  * @PS3_SM_BUTTON_EVENT_HARD: Hardware generated event.
 165  * @PS3_SM_BUTTON_EVENT_SOFT: Software generated event.
 166  */
 167
 168 enum ps3_sys_manager_button_event {
 169         PS3_SM_BUTTON_EVENT_HARD = 0,
 170         PS3_SM_BUTTON_EVENT_SOFT = 1,
 171 };
 172
 173 /**
 174  * enum ps3_sys_manager_next_op - Operation to perform after lpar is destroyed.
 175  */
 176
 177 enum ps3_sys_manager_next_op {
 178         /* version 3 */
 179         PS3_SM_NEXT_OP_SYS_SHUTDOWN = 1,
 180         PS3_SM_NEXT_OP_SYS_REBOOT = 2,
 181         PS3_SM_NEXT_OP_LPAR_REBOOT = 0x82,
 182 };
 183
 184 /**
 185  * enum ps3_sys_manager_wake_source - Next-op wakeup source (bit position mask).
 186  * @PS3_SM_WAKE_DEFAULT: Disk insert, power button, eject button, IR
 187  * controller, and bluetooth controller.
 188  * @PS3_SM_WAKE_RTC:
 189  * @PS3_SM_WAKE_RTC_ERROR:
 190  * @PS3_SM_WAKE_P_O_R: Power on reset.
 191  *
 192  * Additional wakeup sources when specifying PS3_SM_NEXT_OP_SYS_SHUTDOWN.
 193  * The system will always wake from the PS3_SM_WAKE_DEFAULT sources.
 194  * Sources listed here are the only ones available to guests in the
 195  * other-os lpar.
 196  */
 197
 198 enum ps3_sys_manager_wake_source {
 199         /* version 3 */
 200         PS3_SM_WAKE_DEFAULT   = 0,
 201         PS3_SM_WAKE_RTC       = 0x00000040,
 202         PS3_SM_WAKE_RTC_ERROR = 0x00000080,
 203         PS3_SM_WAKE_P_O_R     = 0x80000000,
 204 };
 205
 206 /**
 207  * enum ps3_sys_manager_cmd - Command from system manager to guest.
 208  *
 209  * The guest completes the actions needed, then acks or naks the command via
 210  * ps3_sys_manager_send_response().  In the case of @PS3_SM_CMD_SHUTDOWN,
 211  * the guest must be fully prepared for a system poweroff prior to acking the
 212  * command.
 213  */
 214
 215 enum ps3_sys_manager_cmd {
 216         /* version 1 */
 217         PS3_SM_CMD_SHUTDOWN = 1, /* shutdown guest OS */
 218 };
 219
 220 /**
 221  * ps3_sm_force_power_off - Poweroff helper.
 222  *
 223  * A global variable used to force a poweroff when the power button has
 224  * been pressed irrespective of how init handles the ctrl_alt_del signal.
 225  *
 226  */
 227
 228 static unsigned int ps3_sm_force_power_off;
 229
 230 /**
 231  * ps3_sys_manager_write - Helper to write a two part message to the vuart.
 232  *
 233  */
 234
 235 static int ps3_sys_manager_write(struct ps3_system_bus_device *dev,
 236         const struct ps3_sys_manager_header *header, const void *payload)
 237 {
 238         int result;
 239
 240         BUG_ON(header->version != 1);
 241         BUG_ON(header->size != 16);
 242         BUG_ON(header->payload_size != 8 && header->payload_size != 16);
 243         BUG_ON(header->service_id > 8);
 244
 245         result = ps3_vuart_write(dev, header,
 246                 sizeof(struct ps3_sys_manager_header));
 247
 248         if (!result)
 249                 result = ps3_vuart_write(dev, payload, header->payload_size);
 250
 251         return result;
 252 }
 253
 254 /**
 255  * ps3_sys_manager_send_attr - Send a 'set attribute' to the system manager.
 256  *
 257  */
 258
 259 static int ps3_sys_manager_send_attr(struct ps3_system_bus_device *dev,
 260         enum ps3_sys_manager_attr attr)
 261 {
 262         struct ps3_sys_manager_header header;
 263         struct {
 264                 u8 version;
 265                 u8 reserved_1[3];
 266                 u32 attribute;
 267         } payload;
 268
 269         BUILD_BUG_ON(sizeof(payload) != 8);
 270
 271         dev_dbg(&dev->core, "%s:%d: %xh\n", __func__, __LINE__, attr);
 272
 273         memset(&header, 0, sizeof(header));
 274         header.version = 1;
 275         header.size = 16;
 276         header.payload_size = 16;
 277         header.service_id = PS3_SM_SERVICE_ID_SET_ATTR;
 278
 279         memset(&payload, 0, sizeof(payload));
 280         payload.version = 1;
 281         payload.attribute = attr;
 282
 283         return ps3_sys_manager_write(dev, &header, &payload);
 284 }
 285
 286 /**
 287  * ps3_sys_manager_send_next_op - Send a 'set next op' to the system manager.
 288  *
 289  * Tell the system manager what to do after this lpar is destroyed.
 290  */
 291
 292 static int ps3_sys_manager_send_next_op(struct ps3_system_bus_device *dev,
 293         enum ps3_sys_manager_next_op op,
 294         enum ps3_sys_manager_wake_source wake_source)
 295 {
 296         struct ps3_sys_manager_header header;
 297         struct {
 298                 u8 version;
 299                 u8 type;
 300                 u8 gos_id;
 301                 u8 reserved_1;
 302                 u32 wake_source;
 303                 u8 reserved_2[8];
 304         } payload;
 305
 306         BUILD_BUG_ON(sizeof(payload) != 16);
 307
 308         dev_dbg(&dev->core, "%s:%d: (%xh)\n", __func__, __LINE__, op);
 309
 310         memset(&header, 0, sizeof(header));
 311         header.version = 1;
 312         header.size = 16;
 313         header.payload_size = 16;
 314         header.service_id = PS3_SM_SERVICE_ID_SET_NEXT_OP;
 315
 316         memset(&payload, 0, sizeof(payload));
 317         payload.version = 3;
 318         payload.type = op;
 319         payload.gos_id = 3; /* other os */
 320         payload.wake_source = wake_source;
 321
 322         return ps3_sys_manager_write(dev, &header, &payload);
 323 }
 324
 325 /**
 326  * ps3_sys_manager_send_request_shutdown - Send 'request' to the system manager.
 327  *
 328  * The guest sends this message to request an operation or action of the system
 329  * manager.  The reply is a command message from the system manager.  In the
 330  * command handler the guest performs the requested operation.  The result of
 331  * the command is then communicated back to the system manager with a response
 332  * message.
 333  *
 334  * Currently, the only supported request is the 'shutdown self' request.
 335  */
 336
 337 static int ps3_sys_manager_send_request_shutdown(
 338         struct ps3_system_bus_device *dev)
 339 {
 340         struct ps3_sys_manager_header header;
 341         struct {
 342                 u8 version;
 343                 u8 type;
 344                 u8 gos_id;
 345                 u8 reserved_1[13];
 346         } payload;
 347
 348         BUILD_BUG_ON(sizeof(payload) != 16);
 349
 350         dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
 351
 352         memset(&header, 0, sizeof(header));
 353         header.version = 1;
 354         header.size = 16;
 355         header.payload_size = 16;
 356         header.service_id = PS3_SM_SERVICE_ID_REQUEST;
 357
 358         memset(&payload, 0, sizeof(payload));
 359         payload.version = 1;
 360         payload.type = 1; /* shutdown */
 361         payload.gos_id = 0; /* self */
 362
 363         return ps3_sys_manager_write(dev, &header, &payload);
 364 }
 365
 366 /**
 367  * ps3_sys_manager_send_response - Send a 'response' to the system manager.
 368  * @status: zero = success, others fail.
 369  *
 370  * The guest sends this message to the system manager to acnowledge success or
 371  * failure of a command sent by the system manager.
 372  */
 373
 374 static int ps3_sys_manager_send_response(struct ps3_system_bus_device *dev,
 375         u64 status)
 376 {
 377         struct ps3_sys_manager_header header;
 378         struct {
 379                 u8 version;
 380                 u8 reserved_1[3];
 381                 u8 status;
 382                 u8 reserved_2[11];
 383         } payload;
 384
 385         BUILD_BUG_ON(sizeof(payload) != 16);
 386
 387         dev_dbg(&dev->core, "%s:%d: (%s)\n", __func__, __LINE__,
 388                 (status ? "nak" : "ack"));
 389
 390         memset(&header, 0, sizeof(header));
 391         header.version = 1;
 392         header.size = 16;
 393         header.payload_size = 16;
 394         header.service_id = PS3_SM_SERVICE_ID_RESPONSE;
 395
 396         memset(&payload, 0, sizeof(payload));
 397         payload.version = 1;
 398         payload.status = status;
 399
 400         return ps3_sys_manager_write(dev, &header, &payload);
 401 }
 402
 403 /**
 404  * ps3_sys_manager_handle_event - Second stage event msg handler.
 405  *
 406  */
 407
 408 static int ps3_sys_manager_handle_event(struct ps3_system_bus_device *dev)
 409 {
 410         int result;
 411         struct {
 412                 u8 version;
 413                 u8 type;
 414                 u8 reserved_1[2];
 415                 u32 value;
 416                 u8 reserved_2[8];
 417         } event;
 418
 419         BUILD_BUG_ON(sizeof(event) != 16);
 420
 421         result = ps3_vuart_read(dev, &event, sizeof(event));
 422         BUG_ON(result && "need to retry here");
 423
 424         if (event.version != 1) {
 425                 dev_dbg(&dev->core, "%s:%d: unsupported event version (%u)\n",
 426                         __func__, __LINE__, event.version);
 427                 return -EIO;
 428         }
 429
 430         switch (event.type) {
 431         case PS3_SM_EVENT_POWER_PRESSED:
 432                 dev_dbg(&dev->core, "%s:%d: POWER_PRESSED (%s)\n",
 433                         __func__, __LINE__,
 434                         (event.value == PS3_SM_BUTTON_EVENT_SOFT ? "soft"
 435                         : "hard"));
 436                 ps3_sm_force_power_off = 1;
 437                 /*
 438                  * A memory barrier is use here to sync memory since
 439                  * ps3_sys_manager_final_restart() could be called on
 440                  * another cpu.
 441                  */
 442                 wmb();
 443                 kill_cad_pid(SIGINT, 1); /* ctrl_alt_del */
 444                 break;
 445         case PS3_SM_EVENT_POWER_RELEASED:
 446                 dev_dbg(&dev->core, "%s:%d: POWER_RELEASED (%u ms)\n",
 447                         __func__, __LINE__, event.value);
 448                 break;
 449         case PS3_SM_EVENT_RESET_PRESSED:
 450                 dev_dbg(&dev->core, "%s:%d: RESET_PRESSED (%s)\n",
 451                         __func__, __LINE__,
 452                         (event.value == PS3_SM_BUTTON_EVENT_SOFT ? "soft"
 453                         : "hard"));
 454                 ps3_sm_force_power_off = 0;
 455                 /*
 456                  * A memory barrier is use here to sync memory since
 457                  * ps3_sys_manager_final_restart() could be called on
 458                  * another cpu.
 459                  */
 460                 wmb();
 461                 kill_cad_pid(SIGINT, 1); /* ctrl_alt_del */
 462                 break;
 463         case PS3_SM_EVENT_RESET_RELEASED:
 464                 dev_dbg(&dev->core, "%s:%d: RESET_RELEASED (%u ms)\n",
 465                         __func__, __LINE__, event.value);
 466                 break;
 467         case PS3_SM_EVENT_THERMAL_ALERT:
 468                 dev_dbg(&dev->core, "%s:%d: THERMAL_ALERT (zone %u)\n",
 469                         __func__, __LINE__, event.value);
 470                 pr_info("PS3 Thermal Alert Zone %u\n", event.value);
 471                 break;
 472         case PS3_SM_EVENT_THERMAL_CLEARED:
 473                 dev_dbg(&dev->core, "%s:%d: THERMAL_CLEARED (zone %u)\n",
 474                         __func__, __LINE__, event.value);
 475                 break;
 476         default:
 477                 dev_dbg(&dev->core, "%s:%d: unknown event (%u)\n",
 478                         __func__, __LINE__, event.type);
 479                 return -EIO;
 480         }
 481
 482         return 0;
 483 }
 484 /**
 485  * ps3_sys_manager_handle_cmd - Second stage command msg handler.
 486  *
 487  * The system manager sends this in reply to a 'request' message from the guest.
 488  */
 489
 490 static int ps3_sys_manager_handle_cmd(struct ps3_system_bus_device *dev)
 491 {
 492         int result;
 493         struct {
 494                 u8 version;
 495                 u8 type;
 496                 u8 reserved_1[14];
 497         } cmd;
 498
 499         BUILD_BUG_ON(sizeof(cmd) != 16);
 500
 501         dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
 502
 503         result = ps3_vuart_read(dev, &cmd, sizeof(cmd));
 504         BUG_ON(result && "need to retry here");
 505
 506         if (result)
 507                 return result;
 508
 509         if (cmd.version != 1) {
 510                 dev_dbg(&dev->core, "%s:%d: unsupported cmd version (%u)\n",
 511                         __func__, __LINE__, cmd.version);
 512                 return -EIO;
 513         }
 514
 515         if (cmd.type != PS3_SM_CMD_SHUTDOWN) {
 516                 dev_dbg(&dev->core, "%s:%d: unknown cmd (%u)\n",
 517                         __func__, __LINE__, cmd.type);
 518                 return -EIO;
 519         }
 520
 521         ps3_sys_manager_send_response(dev, 0);
 522         return 0;
 523 }
 524
 525 /**
 526  * ps3_sys_manager_handle_msg - First stage msg handler.
 527  *
 528  * Can be called directly to manually poll vuart and pump message handler.
 529  */
 530
 531 static int ps3_sys_manager_handle_msg(struct ps3_system_bus_device *dev)
 532 {
 533         int result;
 534         struct ps3_sys_manager_header header;
 535
 536         result = ps3_vuart_read(dev, &header,
 537                 sizeof(struct ps3_sys_manager_header));
 538
 539         if (result)
 540                 return result;
 541
 542         if (header.version != 1) {
 543                 dev_dbg(&dev->core, "%s:%d: unsupported header version (%u)\n",
 544                         __func__, __LINE__, header.version);
 545                 dump_sm_header(&header);
 546                 goto fail_header;
 547         }
 548
 549         BUILD_BUG_ON(sizeof(header) != 16);
 550
 551         if (header.size != 16 || (header.payload_size != 8
 552                 && header.payload_size != 16)) {
 553                 dump_sm_header(&header);
 554                 BUG();
 555         }
 556
 557         switch (header.service_id) {
 558         case PS3_SM_SERVICE_ID_EXTERN_EVENT:
 559                 dev_dbg(&dev->core, "%s:%d: EVENT\n", __func__, __LINE__);
 560                 return ps3_sys_manager_handle_event(dev);
 561         case PS3_SM_SERVICE_ID_COMMAND:
 562                 dev_dbg(&dev->core, "%s:%d: COMMAND\n", __func__, __LINE__);
 563                 return ps3_sys_manager_handle_cmd(dev);
 564         case PS3_SM_SERVICE_ID_REQUEST_ERROR:
 565                 dev_dbg(&dev->core, "%s:%d: REQUEST_ERROR\n", __func__,
 566                         __LINE__);
 567                 dump_sm_header(&header);
 568                 break;
 569         default:
 570                 dev_dbg(&dev->core, "%s:%d: unknown service_id (%u)\n",
 571                         __func__, __LINE__, header.service_id);
 572                 break;
 573         }
 574         goto fail_id;
 575
 576 fail_header:
 577         ps3_vuart_clear_rx_bytes(dev, 0);
 578         return -EIO;
 579 fail_id:
 580         ps3_vuart_clear_rx_bytes(dev, header.payload_size);
 581         return -EIO;
 582 }
 583
 584 /**
 585  * ps3_sys_manager_final_power_off - The final platform machine_power_off routine.
 586  *
 587  * This routine never returns.  The routine disables asynchronous vuart reads
 588  * then spins calling ps3_sys_manager_handle_msg() to receive and acknowledge
 589  * the shutdown command sent from the system manager.  Soon after the
 590  * acknowledgement is sent the lpar is destroyed by the HV.  This routine
 591  * should only be called from ps3_power_off() through
 592  * ps3_sys_manager_ops.power_off.
 593  */
 594
 595 static void ps3_sys_manager_final_power_off(struct ps3_system_bus_device *dev)
 596 {
 597         BUG_ON(!dev);
 598
 599         dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
 600
 601         ps3_vuart_cancel_async(dev);
 602
 603         ps3_sys_manager_send_next_op(dev, PS3_SM_NEXT_OP_SYS_SHUTDOWN,
 604                 PS3_SM_WAKE_DEFAULT);
 605         ps3_sys_manager_send_request_shutdown(dev);
 606
 607         pr_emerg("System Halted, OK to turn off power\n");
 608
 609         while (1)
 610                 ps3_sys_manager_handle_msg(dev);
 611 }
 612
 613 /**
 614  * ps3_sys_manager_final_restart - The final platform machine_restart routine.
 615  *
 616  * This routine never returns.  The routine disables asynchronous vuart reads
 617  * then spins calling ps3_sys_manager_handle_msg() to receive and acknowledge
 618  * the shutdown command sent from the system manager.  Soon after the
 619  * acknowledgement is sent the lpar is destroyed by the HV.  This routine
 620  * should only be called from ps3_restart() through ps3_sys_manager_ops.restart.
 621  */
 622
 623 static void ps3_sys_manager_final_restart(struct ps3_system_bus_device *dev)
 624 {
 625         BUG_ON(!dev);
 626
 627         dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
 628
 629         /* Check if we got here via a power button event. */
 630
 631         if (ps3_sm_force_power_off) {
 632                 dev_dbg(&dev->core, "%s:%d: forcing poweroff\n",
 633                         __func__, __LINE__);
 634                 ps3_sys_manager_final_power_off(dev);
 635         }
 636
 637         ps3_vuart_cancel_async(dev);
 638
 639         ps3_sys_manager_send_attr(dev, 0);
 640         ps3_sys_manager_send_next_op(dev, PS3_SM_NEXT_OP_SYS_REBOOT,
 641                 PS3_SM_WAKE_DEFAULT);
 642         ps3_sys_manager_send_request_shutdown(dev);
 643
 644         pr_emerg("System Halted, OK to turn off power\n");
 645
 646         while (1)
 647                 ps3_sys_manager_handle_msg(dev);
 648 }
 649
 650 /**
 651  * ps3_sys_manager_work - Asynchronous read handler.
 652  *
 653  * Signaled when PS3_SM_RX_MSG_LEN_MIN bytes arrive at the vuart port.
 654  */
 655
 656 static void ps3_sys_manager_work(struct ps3_system_bus_device *dev)
 657 {
 658         ps3_sys_manager_handle_msg(dev);
 659         ps3_vuart_read_async(dev, PS3_SM_RX_MSG_LEN_MIN);
 660 }
 661
 662 static int ps3_sys_manager_probe(struct ps3_system_bus_device *dev)
 663 {
 664         int result;
 665         struct ps3_sys_manager_ops ops;
 666
 667         dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
 668
 669         ops.power_off = ps3_sys_manager_final_power_off;
 670         ops.restart = ps3_sys_manager_final_restart;
 671         ops.dev = dev;
 672
 673         /* ps3_sys_manager_register_ops copies ops. */
 674
 675         ps3_sys_manager_register_ops(&ops);
 676
 677         result = ps3_sys_manager_send_attr(dev, PS3_SM_ATTR_ALL);
 678         BUG_ON(result);
 679
 680         result = ps3_vuart_read_async(dev, PS3_SM_RX_MSG_LEN_MIN);
 681         BUG_ON(result);
 682
 683         return result;
 684 }
 685
 686 static int ps3_sys_manager_remove(struct ps3_system_bus_device *dev)
 687 {
 688         dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
 689         return 0;
 690 }
 691
 692 static void ps3_sys_manager_shutdown(struct ps3_system_bus_device *dev)
 693 {
 694         dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
 695 }
 696
 697 static struct ps3_vuart_port_driver ps3_sys_manager = {
 698         .core.match_id = PS3_MATCH_ID_SYSTEM_MANAGER,
 699         .core.core.name = "ps3_sys_manager",
 700         .probe = ps3_sys_manager_probe,
 701         .remove = ps3_sys_manager_remove,
 702         .shutdown = ps3_sys_manager_shutdown,
 703         .work = ps3_sys_manager_work,
 704 };
 705
 706 static int __init ps3_sys_manager_init(void)
 707 {
 708         if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
 709                 return -ENODEV;
 710
 711         return ps3_vuart_port_driver_register(&ps3_sys_manager);
 712 }
 713
 714 module_init(ps3_sys_manager_init);
 715 /* Module remove not supported. */
 716
 717 MODULE_AUTHOR("Sony Corporation");
 718 MODULE_LICENSE("GPL v2");
 719 MODULE_DESCRIPTION("PS3 System Manager");
 720 MODULE_ALIAS(PS3_MODULE_ALIAS_SYSTEM_MANAGER);