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   1 /*
   2  *  PS3 virtual uart
   3  *
   4  *  Copyright (C) 2006 Sony Computer Entertainment Inc.
   5  *  Copyright 2006 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/interrupt.h>
  24 #include <linux/workqueue.h>
  25 #include <asm/ps3.h>
  26
  27 #include <asm/firmware.h>
  28 #include <asm/lv1call.h>
  29 #include <asm/bitops.h>
  30
  31 #include "vuart.h"
  32
  33 MODULE_AUTHOR("Sony Corporation");
  34 MODULE_LICENSE("GPL v2");
  35 MODULE_DESCRIPTION("PS3 vuart");
  36
  37 /**
  38  * vuart - An inter-partition data link service.
  39  *  port 0: PS3 AV Settings.
  40  *  port 2: PS3 System Manager.
  41  *
  42  * The vuart provides a bi-directional byte stream data link between logical
  43  * partitions.  Its primary role is as a communications link between the guest
  44  * OS and the system policy module.  The current HV does not support any
  45  * connections other than those listed.
  46  */
  47
  48 enum {PORT_COUNT = 3,};
  49
  50 enum vuart_param {
  51         PARAM_TX_TRIGGER = 0,
  52         PARAM_RX_TRIGGER = 1,
  53         PARAM_INTERRUPT_MASK = 2,
  54         PARAM_RX_BUF_SIZE = 3, /* read only */
  55         PARAM_RX_BYTES = 4, /* read only */
  56         PARAM_TX_BUF_SIZE = 5, /* read only */
  57         PARAM_TX_BYTES = 6, /* read only */
  58         PARAM_INTERRUPT_STATUS = 7, /* read only */
  59 };
  60
  61 enum vuart_interrupt_bit {
  62         INTERRUPT_BIT_TX = 0,
  63         INTERRUPT_BIT_RX = 1,
  64         INTERRUPT_BIT_DISCONNECT = 2,
  65 };
  66
  67 enum vuart_interrupt_mask {
  68         INTERRUPT_MASK_TX = 1,
  69         INTERRUPT_MASK_RX = 2,
  70         INTERRUPT_MASK_DISCONNECT = 4,
  71 };
  72
  73 /**
  74  * struct ports_bmp - bitmap indicating ports needing service.
  75  *
  76  * A 256 bit read only bitmap indicating ports needing service.  Do not write
  77  * to these bits.  Must not cross a page boundary.
  78  */
  79
  80 struct ports_bmp {
  81         u64 status;
  82         u64 unused[3];
  83 } __attribute__ ((aligned (32)));
  84
  85 #define dump_ports_bmp(_b) _dump_ports_bmp(_b, __func__, __LINE__)
  86 static void __attribute__ ((unused)) _dump_ports_bmp(
  87         const struct ports_bmp* bmp, const char* func, int line)
  88 {
  89         pr_debug("%s:%d: ports_bmp: %016lxh\n", func, line, bmp->status);
  90 }
  91
  92 static int ps3_vuart_match_id_to_port(enum ps3_match_id match_id,
  93         unsigned int *port_number)
  94 {
  95         switch(match_id) {
  96         case PS3_MATCH_ID_AV_SETTINGS:
  97                 *port_number = 0;
  98                 return 0;
  99         case PS3_MATCH_ID_SYSTEM_MANAGER:
 100                 *port_number = 2;
 101                 return 0;
 102         default:
 103                 WARN_ON(1);
 104                 *port_number = UINT_MAX;
 105                 return -EINVAL;
 106         };
 107 }
 108
 109 #define dump_port_params(_b) _dump_port_params(_b, __func__, __LINE__)
 110 static void __attribute__ ((unused)) _dump_port_params(unsigned int port_number,
 111         const char* func, int line)
 112 {
 113 #if defined(DEBUG)
 114         static const char *strings[] = {
 115                 "tx_trigger      ",
 116                 "rx_trigger      ",
 117                 "interrupt_mask  ",
 118                 "rx_buf_size     ",
 119                 "rx_bytes        ",
 120                 "tx_buf_size     ",
 121                 "tx_bytes        ",
 122                 "interrupt_status",
 123         };
 124         int result;
 125         unsigned int i;
 126         u64 value;
 127
 128         for (i = 0; i < ARRAY_SIZE(strings); i++) {
 129                 result = lv1_get_virtual_uart_param(port_number, i, &value);
 130
 131                 if (result) {
 132                         pr_debug("%s:%d: port_%u: %s failed: %s\n", func, line,
 133                                 port_number, strings[i], ps3_result(result));
 134                         continue;
 135                 }
 136                 pr_debug("%s:%d: port_%u: %s = %lxh\n",
 137                         func, line, port_number, strings[i], value);
 138         }
 139 #endif
 140 }
 141
 142 struct vuart_triggers {
 143         unsigned long rx;
 144         unsigned long tx;
 145 };
 146
 147 int ps3_vuart_get_triggers(struct ps3_vuart_port_device *dev,
 148         struct vuart_triggers *trig)
 149 {
 150         int result;
 151         unsigned long size;
 152         unsigned long val;
 153
 154         result = lv1_get_virtual_uart_param(dev->priv->port_number,
 155                 PARAM_TX_TRIGGER, &trig->tx);
 156
 157         if (result) {
 158                 dev_dbg(&dev->core, "%s:%d: tx_trigger failed: %s\n",
 159                         __func__, __LINE__, ps3_result(result));
 160                 return result;
 161         }
 162
 163         result = lv1_get_virtual_uart_param(dev->priv->port_number,
 164                 PARAM_RX_BUF_SIZE, &size);
 165
 166         if (result) {
 167                 dev_dbg(&dev->core, "%s:%d: tx_buf_size failed: %s\n",
 168                         __func__, __LINE__, ps3_result(result));
 169                 return result;
 170         }
 171
 172         result = lv1_get_virtual_uart_param(dev->priv->port_number,
 173                 PARAM_RX_TRIGGER, &val);
 174
 175         if (result) {
 176                 dev_dbg(&dev->core, "%s:%d: rx_trigger failed: %s\n",
 177                         __func__, __LINE__, ps3_result(result));
 178                 return result;
 179         }
 180
 181         trig->rx = size - val;
 182
 183         dev_dbg(&dev->core, "%s:%d: tx %lxh, rx %lxh\n", __func__, __LINE__,
 184                 trig->tx, trig->rx);
 185
 186         return result;
 187 }
 188
 189 int ps3_vuart_set_triggers(struct ps3_vuart_port_device *dev, unsigned int tx,
 190         unsigned int rx)
 191 {
 192         int result;
 193         unsigned long size;
 194
 195         result = lv1_set_virtual_uart_param(dev->priv->port_number,
 196                 PARAM_TX_TRIGGER, tx);
 197
 198         if (result) {
 199                 dev_dbg(&dev->core, "%s:%d: tx_trigger failed: %s\n",
 200                         __func__, __LINE__, ps3_result(result));
 201                 return result;
 202         }
 203
 204         result = lv1_get_virtual_uart_param(dev->priv->port_number,
 205                 PARAM_RX_BUF_SIZE, &size);
 206
 207         if (result) {
 208                 dev_dbg(&dev->core, "%s:%d: tx_buf_size failed: %s\n",
 209                         __func__, __LINE__, ps3_result(result));
 210                 return result;
 211         }
 212
 213         result = lv1_set_virtual_uart_param(dev->priv->port_number,
 214                 PARAM_RX_TRIGGER, size - rx);
 215
 216         if (result) {
 217                 dev_dbg(&dev->core, "%s:%d: rx_trigger failed: %s\n",
 218                         __func__, __LINE__, ps3_result(result));
 219                 return result;
 220         }
 221
 222         dev_dbg(&dev->core, "%s:%d: tx %xh, rx %xh\n", __func__, __LINE__,
 223                 tx, rx);
 224
 225         return result;
 226 }
 227
 228 static int ps3_vuart_get_rx_bytes_waiting(struct ps3_vuart_port_device *dev,
 229         u64 *bytes_waiting)
 230 {
 231         int result = lv1_get_virtual_uart_param(dev->priv->port_number,
 232                 PARAM_RX_BYTES, bytes_waiting);
 233
 234         if (result)
 235                 dev_dbg(&dev->core, "%s:%d: rx_bytes failed: %s\n",
 236                         __func__, __LINE__, ps3_result(result));
 237
 238         dev_dbg(&dev->core, "%s:%d: %lxh\n", __func__, __LINE__,
 239                 *bytes_waiting);
 240         return result;
 241 }
 242
 243 static int ps3_vuart_set_interrupt_mask(struct ps3_vuart_port_device *dev,
 244         unsigned long mask)
 245 {
 246         int result;
 247
 248         dev_dbg(&dev->core, "%s:%d: %lxh\n", __func__, __LINE__, mask);
 249
 250         dev->priv->interrupt_mask = mask;
 251
 252         result = lv1_set_virtual_uart_param(dev->priv->port_number,
 253                 PARAM_INTERRUPT_MASK, dev->priv->interrupt_mask);
 254
 255         if (result)
 256                 dev_dbg(&dev->core, "%s:%d: interrupt_mask failed: %s\n",
 257                         __func__, __LINE__, ps3_result(result));
 258
 259         return result;
 260 }
 261
 262 static int ps3_vuart_get_interrupt_status(struct ps3_vuart_port_device *dev,
 263         unsigned long *status)
 264 {
 265         u64 tmp;
 266         int result = lv1_get_virtual_uart_param(dev->priv->port_number,
 267                 PARAM_INTERRUPT_STATUS, &tmp);
 268
 269         if (result)
 270                 dev_dbg(&dev->core, "%s:%d: interrupt_status failed: %s\n",
 271                         __func__, __LINE__, ps3_result(result));
 272
 273         *status = tmp & dev->priv->interrupt_mask;
 274
 275         dev_dbg(&dev->core, "%s:%d: m %lxh, s %lxh, m&s %lxh\n",
 276                 __func__, __LINE__, dev->priv->interrupt_mask, tmp, *status);
 277
 278         return result;
 279 }
 280
 281 int ps3_vuart_enable_interrupt_tx(struct ps3_vuart_port_device *dev)
 282 {
 283         return (dev->priv->interrupt_mask & INTERRUPT_MASK_TX) ? 0
 284                 : ps3_vuart_set_interrupt_mask(dev, dev->priv->interrupt_mask
 285                 | INTERRUPT_MASK_TX);
 286 }
 287
 288 int ps3_vuart_enable_interrupt_rx(struct ps3_vuart_port_device *dev)
 289 {
 290         return (dev->priv->interrupt_mask & INTERRUPT_MASK_RX) ? 0
 291                 : ps3_vuart_set_interrupt_mask(dev, dev->priv->interrupt_mask
 292                 | INTERRUPT_MASK_RX);
 293 }
 294
 295 int ps3_vuart_enable_interrupt_disconnect(struct ps3_vuart_port_device *dev)
 296 {
 297         return (dev->priv->interrupt_mask & INTERRUPT_MASK_DISCONNECT) ? 0
 298                 : ps3_vuart_set_interrupt_mask(dev, dev->priv->interrupt_mask
 299                 | INTERRUPT_MASK_DISCONNECT);
 300 }
 301
 302 int ps3_vuart_disable_interrupt_tx(struct ps3_vuart_port_device *dev)
 303 {
 304         return (dev->priv->interrupt_mask & INTERRUPT_MASK_TX)
 305                 ? ps3_vuart_set_interrupt_mask(dev, dev->priv->interrupt_mask
 306                 & ~INTERRUPT_MASK_TX) : 0;
 307 }
 308
 309 int ps3_vuart_disable_interrupt_rx(struct ps3_vuart_port_device *dev)
 310 {
 311         return (dev->priv->interrupt_mask & INTERRUPT_MASK_RX)
 312                 ? ps3_vuart_set_interrupt_mask(dev, dev->priv->interrupt_mask
 313                 & ~INTERRUPT_MASK_RX) : 0;
 314 }
 315
 316 int ps3_vuart_disable_interrupt_disconnect(struct ps3_vuart_port_device *dev)
 317 {
 318         return (dev->priv->interrupt_mask & INTERRUPT_MASK_DISCONNECT)
 319                 ? ps3_vuart_set_interrupt_mask(dev, dev->priv->interrupt_mask
 320                 & ~INTERRUPT_MASK_DISCONNECT) : 0;
 321 }
 322
 323 /**
 324  * ps3_vuart_raw_write - Low level write helper.
 325  *
 326  * Do not call ps3_vuart_raw_write directly, use ps3_vuart_write.
 327  */
 328
 329 static int ps3_vuart_raw_write(struct ps3_vuart_port_device *dev,
 330         const void* buf, unsigned int bytes, unsigned long *bytes_written)
 331 {
 332         int result;
 333
 334         result = lv1_write_virtual_uart(dev->priv->port_number,
 335                 ps3_mm_phys_to_lpar(__pa(buf)), bytes, bytes_written);
 336
 337         if (result) {
 338                 dev_dbg(&dev->core, "%s:%d: lv1_write_virtual_uart failed: "
 339                         "%s\n", __func__, __LINE__, ps3_result(result));
 340                 return result;
 341         }
 342
 343         dev->priv->stats.bytes_written += *bytes_written;
 344
 345         dev_dbg(&dev->core, "%s:%d: wrote %lxh/%xh=>%lxh\n", __func__, __LINE__,
 346                 *bytes_written, bytes, dev->priv->stats.bytes_written);
 347
 348         return result;
 349 }
 350
 351 /**
 352  * ps3_vuart_raw_read - Low level read helper.
 353  *
 354  * Do not call ps3_vuart_raw_read directly, use ps3_vuart_read.
 355  */
 356
 357 static int ps3_vuart_raw_read(struct ps3_vuart_port_device *dev, void* buf,
 358         unsigned int bytes, unsigned long *bytes_read)
 359 {
 360         int result;
 361
 362         dev_dbg(&dev->core, "%s:%d: %xh\n", __func__, __LINE__, bytes);
 363
 364         result = lv1_read_virtual_uart(dev->priv->port_number,
 365                 ps3_mm_phys_to_lpar(__pa(buf)), bytes, bytes_read);
 366
 367         if (result) {
 368                 dev_dbg(&dev->core, "%s:%d: lv1_read_virtual_uart failed: %s\n",
 369                         __func__, __LINE__, ps3_result(result));
 370                 return result;
 371         }
 372
 373         dev->priv->stats.bytes_read += *bytes_read;
 374
 375         dev_dbg(&dev->core, "%s:%d: read %lxh/%xh=>%lxh\n", __func__, __LINE__,
 376                 *bytes_read, bytes, dev->priv->stats.bytes_read);
 377
 378         return result;
 379 }
 380
 381 /**
 382  * ps3_vuart_clear_rx_bytes - Discard bytes received.
 383  * @bytes: Max byte count to discard, zero = all pending.
 384  *
 385  * Used to clear pending rx interrupt source.  Will not block.
 386  */
 387
 388 void ps3_vuart_clear_rx_bytes(struct ps3_vuart_port_device *dev,
 389         unsigned int bytes)
 390 {
 391         int result;
 392         u64 bytes_waiting;
 393         void* tmp;
 394
 395         result = ps3_vuart_get_rx_bytes_waiting(dev, &bytes_waiting);
 396
 397         BUG_ON(result);
 398
 399         bytes = bytes ? min(bytes, (unsigned int)bytes_waiting) : bytes_waiting;
 400
 401         dev_dbg(&dev->core, "%s:%d: %u\n", __func__, __LINE__, bytes);
 402
 403         if (!bytes)
 404                 return;
 405
 406         /* Add some extra space for recently arrived data. */
 407
 408         bytes += 128;
 409
 410         tmp = kmalloc(bytes, GFP_KERNEL);
 411
 412         if (!tmp)
 413                 return;
 414
 415         ps3_vuart_raw_read(dev, tmp, bytes, &bytes_waiting);
 416
 417         kfree(tmp);
 418
 419         /* Don't include these bytes in the stats. */
 420
 421         dev->priv->stats.bytes_read -= bytes_waiting;
 422 }
 423
 424 /**
 425  * struct list_buffer - An element for a port device fifo buffer list.
 426  */
 427
 428 struct list_buffer {
 429         struct list_head link;
 430         const unsigned char *head;
 431         const unsigned char *tail;
 432         unsigned long dbg_number;
 433         unsigned char data[];
 434 };
 435
 436 /**
 437  * ps3_vuart_write - the entry point for writing data to a port
 438  *
 439  * If the port is idle on entry as much of the incoming data is written to
 440  * the port as the port will accept.  Otherwise a list buffer is created
 441  * and any remaning incoming data is copied to that buffer.  The buffer is
 442  * then enqueued for transmision via the transmit interrupt.
 443  */
 444
 445 int ps3_vuart_write(struct ps3_vuart_port_device *dev, const void* buf,
 446         unsigned int bytes)
 447 {
 448         static unsigned long dbg_number;
 449         int result;
 450         unsigned long flags;
 451         struct list_buffer *lb;
 452
 453         dev_dbg(&dev->core, "%s:%d: %u(%xh) bytes\n", __func__, __LINE__,
 454                 bytes, bytes);
 455
 456         spin_lock_irqsave(&dev->priv->tx_list.lock, flags);
 457
 458         if (list_empty(&dev->priv->tx_list.head)) {
 459                 unsigned long bytes_written;
 460
 461                 result = ps3_vuart_raw_write(dev, buf, bytes, &bytes_written);
 462
 463                 spin_unlock_irqrestore(&dev->priv->tx_list.lock, flags);
 464
 465                 if (result) {
 466                         dev_dbg(&dev->core,
 467                                 "%s:%d: ps3_vuart_raw_write failed\n",
 468                                 __func__, __LINE__);
 469                         return result;
 470                 }
 471
 472                 if (bytes_written == bytes) {
 473                         dev_dbg(&dev->core, "%s:%d: wrote %xh bytes\n",
 474                                 __func__, __LINE__, bytes);
 475                         return 0;
 476                 }
 477
 478                 bytes -= bytes_written;
 479                 buf += bytes_written;
 480         } else
 481                 spin_unlock_irqrestore(&dev->priv->tx_list.lock, flags);
 482
 483         lb = kmalloc(sizeof(struct list_buffer) + bytes, GFP_KERNEL);
 484
 485         if (!lb) {
 486                 return -ENOMEM;
 487         }
 488
 489         memcpy(lb->data, buf, bytes);
 490         lb->head = lb->data;
 491         lb->tail = lb->data + bytes;
 492         lb->dbg_number = ++dbg_number;
 493
 494         spin_lock_irqsave(&dev->priv->tx_list.lock, flags);
 495         list_add_tail(&lb->link, &dev->priv->tx_list.head);
 496         ps3_vuart_enable_interrupt_tx(dev);
 497         spin_unlock_irqrestore(&dev->priv->tx_list.lock, flags);
 498
 499         dev_dbg(&dev->core, "%s:%d: queued buf_%lu, %xh bytes\n",
 500                 __func__, __LINE__, lb->dbg_number, bytes);
 501
 502         return 0;
 503 }
 504
 505 /**
 506  * ps3_vuart_read - the entry point for reading data from a port
 507  *
 508  * If enough bytes to satisfy the request are held in the buffer list those
 509  * bytes are dequeued and copied to the caller's buffer.  Emptied list buffers
 510  * are retiered.  If the request cannot be statified by bytes held in the list
 511  * buffers -EAGAIN is returned.
 512  */
 513
 514 int ps3_vuart_read(struct ps3_vuart_port_device *dev, void* buf,
 515         unsigned int bytes)
 516 {
 517         unsigned long flags;
 518         struct list_buffer *lb, *n;
 519         unsigned long bytes_read;
 520
 521         dev_dbg(&dev->core, "%s:%d: %u(%xh) bytes\n", __func__, __LINE__,
 522                 bytes, bytes);
 523
 524         spin_lock_irqsave(&dev->priv->rx_list.lock, flags);
 525
 526         if (dev->priv->rx_list.bytes_held < bytes) {
 527                 spin_unlock_irqrestore(&dev->priv->rx_list.lock, flags);
 528                 dev_dbg(&dev->core, "%s:%d: starved for %lxh bytes\n",
 529                         __func__, __LINE__,
 530                         bytes - dev->priv->rx_list.bytes_held);
 531                 return -EAGAIN;
 532         }
 533
 534         list_for_each_entry_safe(lb, n, &dev->priv->rx_list.head, link) {
 535                 bytes_read = min((unsigned int)(lb->tail - lb->head), bytes);
 536
 537                 memcpy(buf, lb->head, bytes_read);
 538                 buf += bytes_read;
 539                 bytes -= bytes_read;
 540                 dev->priv->rx_list.bytes_held -= bytes_read;
 541
 542                 if (bytes_read < lb->tail - lb->head) {
 543                         lb->head += bytes_read;
 544                         dev_dbg(&dev->core, "%s:%d: buf_%lu: dequeued %lxh "
 545                                 "bytes\n", __func__, __LINE__, lb->dbg_number,
 546                                 bytes_read);
 547                         spin_unlock_irqrestore(&dev->priv->rx_list.lock, flags);
 548                         return 0;
 549                 }
 550
 551                 dev_dbg(&dev->core, "%s:%d: buf_%lu: free, dequeued %lxh "
 552                         "bytes\n", __func__, __LINE__, lb->dbg_number,
 553                         bytes_read);
 554
 555                 list_del(&lb->link);
 556                 kfree(lb);
 557         }
 558
 559         spin_unlock_irqrestore(&dev->priv->rx_list.lock, flags);
 560         return 0;
 561 }
 562
 563 int ps3_vuart_read_async(struct ps3_vuart_port_device *dev, work_func_t func,
 564         unsigned int bytes)
 565 {
 566         unsigned long flags;
 567
 568         if(dev->priv->work.trigger) {
 569                 dev_dbg(&dev->core, "%s:%d: warning, multiple calls\n",
 570                         __func__, __LINE__);
 571                 return -EAGAIN;
 572         }
 573
 574         BUG_ON(!bytes);
 575
 576         PREPARE_WORK(&dev->priv->work.work, func);
 577
 578         spin_lock_irqsave(&dev->priv->work.lock, flags);
 579         if(dev->priv->rx_list.bytes_held >= bytes) {
 580                 dev_dbg(&dev->core, "%s:%d: schedule_work %xh bytes\n",
 581                         __func__, __LINE__, bytes);
 582                 schedule_work(&dev->priv->work.work);
 583                 spin_unlock_irqrestore(&dev->priv->work.lock, flags);
 584                 return 0;
 585         }
 586
 587         dev->priv->work.trigger = bytes;
 588         spin_unlock_irqrestore(&dev->priv->work.lock, flags);
 589
 590         dev_dbg(&dev->core, "%s:%d: waiting for %u(%xh) bytes\n", __func__,
 591                 __LINE__, bytes, bytes);
 592
 593         return 0;
 594 }
 595
 596 void ps3_vuart_cancel_async(struct ps3_vuart_port_device *dev)
 597 {
 598         dev->priv->work.trigger = 0;
 599 }
 600
 601 /**
 602  * ps3_vuart_handle_interrupt_tx - third stage transmit interrupt handler
 603  *
 604  * Services the transmit interrupt for the port.  Writes as much data from the
 605  * buffer list as the port will accept.  Retires any emptied list buffers and
 606  * adjusts the final list buffer state for a partial write.
 607  */
 608
 609 static int ps3_vuart_handle_interrupt_tx(struct ps3_vuart_port_device *dev)
 610 {
 611         int result = 0;
 612         unsigned long flags;
 613         struct list_buffer *lb, *n;
 614         unsigned long bytes_total = 0;
 615
 616         dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
 617
 618         spin_lock_irqsave(&dev->priv->tx_list.lock, flags);
 619
 620         list_for_each_entry_safe(lb, n, &dev->priv->tx_list.head, link) {
 621
 622                 unsigned long bytes_written;
 623
 624                 result = ps3_vuart_raw_write(dev, lb->head, lb->tail - lb->head,
 625                         &bytes_written);
 626
 627                 if (result) {
 628                         dev_dbg(&dev->core,
 629                                 "%s:%d: ps3_vuart_raw_write failed\n",
 630                                 __func__, __LINE__);
 631                         break;
 632                 }
 633
 634                 bytes_total += bytes_written;
 635
 636                 if (bytes_written < lb->tail - lb->head) {
 637                         lb->head += bytes_written;
 638                         dev_dbg(&dev->core,
 639                                 "%s:%d cleared buf_%lu, %lxh bytes\n",
 640                                 __func__, __LINE__, lb->dbg_number,
 641                                 bytes_written);
 642                         goto port_full;
 643                 }
 644
 645                 dev_dbg(&dev->core, "%s:%d free buf_%lu\n", __func__, __LINE__,
 646                         lb->dbg_number);
 647
 648                 list_del(&lb->link);
 649                 kfree(lb);
 650         }
 651
 652         ps3_vuart_disable_interrupt_tx(dev);
 653 port_full:
 654         spin_unlock_irqrestore(&dev->priv->tx_list.lock, flags);
 655         dev_dbg(&dev->core, "%s:%d wrote %lxh bytes total\n",
 656                 __func__, __LINE__, bytes_total);
 657         return result;
 658 }
 659
 660 /**
 661  * ps3_vuart_handle_interrupt_rx - third stage receive interrupt handler
 662  *
 663  * Services the receive interrupt for the port.  Creates a list buffer and
 664  * copies all waiting port data to that buffer and enqueues the buffer in the
 665  * buffer list.  Buffer list data is dequeued via ps3_vuart_read.
 666  */
 667
 668 static int ps3_vuart_handle_interrupt_rx(struct ps3_vuart_port_device *dev)
 669 {
 670         static unsigned long dbg_number;
 671         int result = 0;
 672         unsigned long flags;
 673         struct list_buffer *lb;
 674         unsigned long bytes;
 675
 676         dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
 677
 678         result = ps3_vuart_get_rx_bytes_waiting(dev, &bytes);
 679
 680         if (result)
 681                 return -EIO;
 682
 683         BUG_ON(!bytes);
 684
 685         /* Add some extra space for recently arrived data. */
 686
 687         bytes += 128;
 688
 689         lb = kmalloc(sizeof(struct list_buffer) + bytes, GFP_ATOMIC);
 690
 691         if (!lb)
 692                 return -ENOMEM;
 693
 694         ps3_vuart_raw_read(dev, lb->data, bytes, &bytes);
 695
 696         lb->head = lb->data;
 697         lb->tail = lb->data + bytes;
 698         lb->dbg_number = ++dbg_number;
 699
 700         spin_lock_irqsave(&dev->priv->rx_list.lock, flags);
 701         list_add_tail(&lb->link, &dev->priv->rx_list.head);
 702         dev->priv->rx_list.bytes_held += bytes;
 703         spin_unlock_irqrestore(&dev->priv->rx_list.lock, flags);
 704
 705         dev_dbg(&dev->core, "%s:%d: buf_%lu: queued %lxh bytes\n",
 706                 __func__, __LINE__, lb->dbg_number, bytes);
 707
 708         spin_lock_irqsave(&dev->priv->work.lock, flags);
 709         if(dev->priv->work.trigger
 710                 && dev->priv->rx_list.bytes_held >= dev->priv->work.trigger) {
 711                 dev_dbg(&dev->core, "%s:%d: schedule_work %lxh bytes\n",
 712                         __func__, __LINE__, dev->priv->work.trigger);
 713                 dev->priv->work.trigger = 0;
 714                 schedule_work(&dev->priv->work.work);
 715         }
 716         spin_unlock_irqrestore(&dev->priv->work.lock, flags);
 717         return 0;
 718 }
 719
 720 static int ps3_vuart_handle_interrupt_disconnect(
 721         struct ps3_vuart_port_device *dev)
 722 {
 723         dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
 724         BUG_ON("no support");
 725         return -1;
 726 }
 727
 728 /**
 729  * ps3_vuart_handle_port_interrupt - second stage interrupt handler
 730  *
 731  * Services any pending interrupt types for the port.  Passes control to the
 732  * third stage type specific interrupt handler.  Returns control to the first
 733  * stage handler after one iteration.
 734  */
 735
 736 static int ps3_vuart_handle_port_interrupt(struct ps3_vuart_port_device *dev)
 737 {
 738         int result;
 739         unsigned long status;
 740
 741         result = ps3_vuart_get_interrupt_status(dev, &status);
 742
 743         if (result)
 744                 return result;
 745
 746         dev_dbg(&dev->core, "%s:%d: status: %lxh\n", __func__, __LINE__,
 747                 status);
 748
 749         if (status & INTERRUPT_MASK_DISCONNECT) {
 750                 dev->priv->stats.disconnect_interrupts++;
 751                 result = ps3_vuart_handle_interrupt_disconnect(dev);
 752                 if (result)
 753                         ps3_vuart_disable_interrupt_disconnect(dev);
 754         }
 755
 756         if (status & INTERRUPT_MASK_TX) {
 757                 dev->priv->stats.tx_interrupts++;
 758                 result = ps3_vuart_handle_interrupt_tx(dev);
 759                 if (result)
 760                         ps3_vuart_disable_interrupt_tx(dev);
 761         }
 762
 763         if (status & INTERRUPT_MASK_RX) {
 764                 dev->priv->stats.rx_interrupts++;
 765                 result = ps3_vuart_handle_interrupt_rx(dev);
 766                 if (result)
 767                         ps3_vuart_disable_interrupt_rx(dev);
 768         }
 769
 770         return 0;
 771 }
 772
 773 struct vuart_bus_priv {
 774         const struct ports_bmp bmp;
 775         unsigned int virq;
 776         struct semaphore probe_mutex;
 777         int use_count;
 778         struct ps3_vuart_port_device *devices[PORT_COUNT];
 779 } static vuart_bus_priv;
 780
 781 /**
 782  * ps3_vuart_irq_handler - first stage interrupt handler
 783  *
 784  * Loops finding any interrupting port and its associated instance data.
 785  * Passes control to the second stage port specific interrupt handler.  Loops
 786  * until all outstanding interrupts are serviced.
 787  */
 788
 789 static irqreturn_t ps3_vuart_irq_handler(int irq, void *_private)
 790 {
 791         struct vuart_bus_priv *bus_priv;
 792
 793         BUG_ON(!_private);
 794         bus_priv = (struct vuart_bus_priv *)_private;
 795
 796         while (1) {
 797                 unsigned int port;
 798
 799                 dump_ports_bmp(&bus_priv->bmp);
 800
 801                 port = (BITS_PER_LONG - 1) - __ilog2(bus_priv->bmp.status);
 802
 803                 if (port == BITS_PER_LONG)
 804                         break;
 805
 806                 BUG_ON(port >= PORT_COUNT);
 807                 BUG_ON(!bus_priv->devices[port]);
 808
 809                 ps3_vuart_handle_port_interrupt(bus_priv->devices[port]);
 810         }
 811
 812         return IRQ_HANDLED;
 813 }
 814
 815 static int ps3_vuart_match(struct device *_dev, struct device_driver *_drv)
 816 {
 817         int result;
 818         struct ps3_vuart_port_driver *drv = to_ps3_vuart_port_driver(_drv);
 819         struct ps3_vuart_port_device *dev = to_ps3_vuart_port_device(_dev);
 820
 821         result = dev->match_id == drv->match_id;
 822
 823         dev_info(&dev->core, "%s:%d: dev=%u(%s), drv=%u(%s): %s\n", __func__,
 824                 __LINE__, dev->match_id, dev->core.bus_id, drv->match_id,
 825                 drv->core.name, (result ? "match" : "miss"));
 826
 827         return result;
 828 }
 829
 830 static int ps3_vuart_probe(struct device *_dev)
 831 {
 832         int result;
 833         unsigned int port_number;
 834         struct ps3_vuart_port_device *dev = to_ps3_vuart_port_device(_dev);
 835         struct ps3_vuart_port_driver *drv =
 836                 to_ps3_vuart_port_driver(_dev->driver);
 837
 838         dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
 839
 840         BUG_ON(!drv);
 841
 842         down(&vuart_bus_priv.probe_mutex);
 843
 844         /* Setup vuart_bus_priv.devices[]. */
 845
 846         result = ps3_vuart_match_id_to_port(dev->match_id,
 847                 &port_number);
 848
 849         if (result) {
 850                 dev_dbg(&dev->core, "%s:%d: unknown match_id (%d)\n",
 851                         __func__, __LINE__, dev->match_id);
 852                 result = -EINVAL;
 853                 goto fail_match;
 854         }
 855
 856         if (vuart_bus_priv.devices[port_number]) {
 857                 dev_dbg(&dev->core, "%s:%d: port busy (%d)\n", __func__,
 858                         __LINE__, port_number);
 859                 result = -EBUSY;
 860                 goto fail_match;
 861         }
 862
 863         vuart_bus_priv.devices[port_number] = dev;
 864
 865         /* Setup dev->priv. */
 866
 867         dev->priv = kzalloc(sizeof(struct ps3_vuart_port_priv), GFP_KERNEL);
 868
 869         if (!dev->priv) {
 870                 result = -ENOMEM;
 871                 goto fail_alloc;
 872         }
 873
 874         dev->priv->port_number = port_number;
 875
 876         INIT_LIST_HEAD(&dev->priv->tx_list.head);
 877         spin_lock_init(&dev->priv->tx_list.lock);
 878
 879         INIT_LIST_HEAD(&dev->priv->rx_list.head);
 880         spin_lock_init(&dev->priv->rx_list.lock);
 881
 882         INIT_WORK(&dev->priv->work.work, NULL);
 883         spin_lock_init(&dev->priv->work.lock);
 884         dev->priv->work.trigger = 0;
 885         dev->priv->work.dev = dev;
 886
 887         if (++vuart_bus_priv.use_count == 1) {
 888
 889                 result = ps3_vuart_irq_setup(PS3_BINDING_CPU_ANY,
 890                         (void*)&vuart_bus_priv.bmp.status, &vuart_bus_priv.virq);
 891
 892                 if (result) {
 893                         dev_dbg(&dev->core,
 894                                 "%s:%d: ps3_vuart_irq_setup failed (%d)\n",
 895                                 __func__, __LINE__, result);
 896                         result = -EPERM;
 897                         goto fail_alloc_irq;
 898                 }
 899
 900                 result = request_irq(vuart_bus_priv.virq, ps3_vuart_irq_handler,
 901                         IRQF_DISABLED, "vuart", &vuart_bus_priv);
 902
 903                 if (result) {
 904                         dev_info(&dev->core, "%s:%d: request_irq failed (%d)\n",
 905                                 __func__, __LINE__, result);
 906                         goto fail_request_irq;
 907                 }
 908         }
 909
 910         /* clear stale pending interrupts */
 911
 912         ps3_vuart_clear_rx_bytes(dev, 0);
 913
 914         ps3_vuart_set_interrupt_mask(dev, INTERRUPT_MASK_RX);
 915
 916         ps3_vuart_set_triggers(dev, 1, 1);
 917
 918         if (drv->probe)
 919                 result = drv->probe(dev);
 920         else {
 921                 result = 0;
 922                 dev_info(&dev->core, "%s:%d: no probe method\n", __func__,
 923                         __LINE__);
 924         }
 925
 926         if (result) {
 927                 dev_dbg(&dev->core, "%s:%d: drv->probe failed\n",
 928                         __func__, __LINE__);
 929                 down(&vuart_bus_priv.probe_mutex);
 930                 goto fail_probe;
 931         }
 932
 933         up(&vuart_bus_priv.probe_mutex);
 934
 935         return result;
 936
 937 fail_probe:
 938         ps3_vuart_set_interrupt_mask(dev, 0);
 939 fail_request_irq:
 940         ps3_vuart_irq_destroy(vuart_bus_priv.virq);
 941         vuart_bus_priv.virq = NO_IRQ;
 942 fail_alloc_irq:
 943         --vuart_bus_priv.use_count;
 944         kfree(dev->priv);
 945         dev->priv = NULL;
 946 fail_alloc:
 947         vuart_bus_priv.devices[port_number] = NULL;
 948 fail_match:
 949         up(&vuart_bus_priv.probe_mutex);
 950         dev_dbg(&dev->core, "%s:%d failed\n", __func__, __LINE__);
 951         return result;
 952 }
 953
 954 static int ps3_vuart_remove(struct device *_dev)
 955 {
 956         struct ps3_vuart_port_device *dev = to_ps3_vuart_port_device(_dev);
 957         struct ps3_vuart_port_driver *drv =
 958                 to_ps3_vuart_port_driver(_dev->driver);
 959
 960         down(&vuart_bus_priv.probe_mutex);
 961
 962         dev_dbg(&dev->core, "%s:%d: %s\n", __func__, __LINE__,
 963                 dev->core.bus_id);
 964
 965         BUG_ON(vuart_bus_priv.use_count < 1);
 966
 967         if (drv->remove)
 968                 drv->remove(dev);
 969         else
 970                 dev_dbg(&dev->core, "%s:%d: %s no remove method\n", __func__,
 971                         __LINE__, dev->core.bus_id);
 972
 973         vuart_bus_priv.devices[dev->priv->port_number] = NULL;
 974
 975         if (--vuart_bus_priv.use_count == 0) {
 976                 BUG();
 977                 free_irq(vuart_bus_priv.virq, &vuart_bus_priv);
 978                 ps3_vuart_irq_destroy(vuart_bus_priv.virq);
 979                 vuart_bus_priv.virq = NO_IRQ;
 980         }
 981
 982         kfree(dev->priv);
 983         dev->priv = NULL;
 984
 985         up(&vuart_bus_priv.probe_mutex);
 986         return 0;
 987 }
 988
 989 static void ps3_vuart_shutdown(struct device *_dev)
 990 {
 991         struct ps3_vuart_port_device *dev = to_ps3_vuart_port_device(_dev);
 992         struct ps3_vuart_port_driver *drv =
 993                 to_ps3_vuart_port_driver(_dev->driver);
 994
 995         dev_dbg(&dev->core, "%s:%d: %s\n", __func__, __LINE__,
 996                 dev->core.bus_id);
 997
 998         if (drv->shutdown)
 999                 drv->shutdown(dev);
1000         else
1001                 dev_dbg(&dev->core, "%s:%d: %s no shutdown method\n", __func__,
1002                         __LINE__, dev->core.bus_id);
1003 }
1004
1005 /**
1006  * ps3_vuart_bus - The vuart bus instance.
1007  *
1008  * The vuart is managed as a bus that port devices connect to.
1009  */
1010
1011 struct bus_type ps3_vuart_bus = {
1012         .name = "ps3_vuart",
1013         .match = ps3_vuart_match,
1014         .probe = ps3_vuart_probe,
1015         .remove = ps3_vuart_remove,
1016         .shutdown = ps3_vuart_shutdown,
1017 };
1018
1019 int __init ps3_vuart_bus_init(void)
1020 {
1021         int result;
1022
1023         pr_debug("%s:%d:\n", __func__, __LINE__);
1024
1025         if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
1026                 return -ENODEV;
1027
1028         init_MUTEX(&vuart_bus_priv.probe_mutex);
1029         result = bus_register(&ps3_vuart_bus);
1030         BUG_ON(result);
1031
1032         return result;
1033 }
1034
1035 void __exit ps3_vuart_bus_exit(void)
1036 {
1037         pr_debug("%s:%d:\n", __func__, __LINE__);
1038         bus_unregister(&ps3_vuart_bus);
1039 }
1040
1041 core_initcall(ps3_vuart_bus_init);
1042 module_exit(ps3_vuart_bus_exit);
1043
1044 /**
1045  * ps3_vuart_port_release_device - Remove a vuart port device.
1046  */
1047
1048 static void ps3_vuart_port_release_device(struct device *_dev)
1049 {
1050 #if defined(DEBUG)
1051         struct ps3_vuart_port_device *dev = to_ps3_vuart_port_device(_dev);
1052
1053         dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
1054
1055         BUG_ON(dev->priv && "forgot to free");
1056         memset(&dev->core, 0, sizeof(dev->core));
1057 #endif
1058 }
1059
1060 /**
1061  * ps3_vuart_port_device_register - Add a vuart port device.
1062  */
1063
1064 int ps3_vuart_port_device_register(struct ps3_vuart_port_device *dev)
1065 {
1066         static unsigned int dev_count = 1;
1067
1068         BUG_ON(dev->priv && "forgot to free");
1069
1070         dev->core.parent = NULL;
1071         dev->core.bus = &ps3_vuart_bus;
1072         dev->core.release = ps3_vuart_port_release_device;
1073
1074         snprintf(dev->core.bus_id, sizeof(dev->core.bus_id), "vuart_%02x",
1075                 dev_count++);
1076
1077         dev_dbg(&dev->core, "%s:%d register\n", __func__, __LINE__);
1078
1079         return device_register(&dev->core);
1080 }
1081
1082 EXPORT_SYMBOL_GPL(ps3_vuart_port_device_register);
1083
1084 /**
1085  * ps3_vuart_port_driver_register - Add a vuart port device driver.
1086  */
1087
1088 int ps3_vuart_port_driver_register(struct ps3_vuart_port_driver *drv)
1089 {
1090         int result;
1091
1092         pr_debug("%s:%d: (%s)\n", __func__, __LINE__, drv->core.name);
1093         drv->core.bus = &ps3_vuart_bus;
1094         result = driver_register(&drv->core);
1095         return result;
1096 }
1097
1098 EXPORT_SYMBOL_GPL(ps3_vuart_port_driver_register);
1099
1100 /**
1101  * ps3_vuart_port_driver_unregister - Remove a vuart port device driver.
1102  */
1103
1104 void ps3_vuart_port_driver_unregister(struct ps3_vuart_port_driver *drv)
1105 {
1106         pr_debug("%s:%d: (%s)\n", __func__, __LINE__, drv->core.name);
1107         driver_unregister(&drv->core);
1108 }
1109
1110 EXPORT_SYMBOL_GPL(ps3_vuart_port_driver_unregister);