git.oblomov.eu Git - linux-2.6/blob - drivers/ps3/vuart.c

   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 /* redefine dev_dbg to do a syntax check */
  86
  87 #if !defined(DEBUG)
  88 #undef dev_dbg
  89 static inline int __attribute__ ((format (printf, 2, 3))) dev_dbg(
  90         const struct device *_dev, const char *fmt, ...) {return 0;}
  91 #endif
  92
  93 #define dump_ports_bmp(_b) _dump_ports_bmp(_b, __func__, __LINE__)
  94 static void __attribute__ ((unused)) _dump_ports_bmp(
  95         const struct ports_bmp* bmp, const char* func, int line)
  96 {
  97         pr_debug("%s:%d: ports_bmp: %016lxh\n", func, line, bmp->status);
  98 }
  99
 100 static int ps3_vuart_match_id_to_port(enum ps3_match_id match_id,
 101         unsigned int *port_number)
 102 {
 103         switch(match_id) {
 104         case PS3_MATCH_ID_AV_SETTINGS:
 105                 *port_number = 0;
 106                 return 0;
 107         case PS3_MATCH_ID_SYSTEM_MANAGER:
 108                 *port_number = 2;
 109                 return 0;
 110         default:
 111                 WARN_ON(1);
 112                 *port_number = UINT_MAX;
 113                 return -EINVAL;
 114         };
 115 }
 116
 117 #define dump_port_params(_b) _dump_port_params(_b, __func__, __LINE__)
 118 static void __attribute__ ((unused)) _dump_port_params(unsigned int port_number,
 119         const char* func, int line)
 120 {
 121 #if defined(DEBUG)
 122         static const char *strings[] = {
 123                 "tx_trigger      ",
 124                 "rx_trigger      ",
 125                 "interrupt_mask  ",
 126                 "rx_buf_size     ",
 127                 "rx_bytes        ",
 128                 "tx_buf_size     ",
 129                 "tx_bytes        ",
 130                 "interrupt_status",
 131         };
 132         int result;
 133         unsigned int i;
 134         u64 value;
 135
 136         for (i = 0; i < ARRAY_SIZE(strings); i++) {
 137                 result = lv1_get_virtual_uart_param(port_number, i, &value);
 138
 139                 if (result) {
 140                         pr_debug("%s:%d: port_%u: %s failed: %s\n", func, line,
 141                                 port_number, strings[i], ps3_result(result));
 142                         continue;
 143                 }
 144                 pr_debug("%s:%d: port_%u: %s = %lxh\n",
 145                         func, line, port_number, strings[i], value);
 146         }
 147 #endif
 148 }
 149
 150 struct vuart_triggers {
 151         unsigned long rx;
 152         unsigned long tx;
 153 };
 154
 155 int ps3_vuart_get_triggers(struct ps3_vuart_port_device *dev,
 156         struct vuart_triggers *trig)
 157 {
 158         int result;
 159         unsigned long size;
 160         unsigned long val;
 161
 162         result = lv1_get_virtual_uart_param(dev->priv->port_number,
 163                 PARAM_TX_TRIGGER, &trig->tx);
 164
 165         if (result) {
 166                 dev_dbg(&dev->core, "%s:%d: tx_trigger failed: %s\n",
 167                         __func__, __LINE__, ps3_result(result));
 168                 return result;
 169         }
 170
 171         result = lv1_get_virtual_uart_param(dev->priv->port_number,
 172                 PARAM_RX_BUF_SIZE, &size);
 173
 174         if (result) {
 175                 dev_dbg(&dev->core, "%s:%d: tx_buf_size failed: %s\n",
 176                         __func__, __LINE__, ps3_result(result));
 177                 return result;
 178         }
 179
 180         result = lv1_get_virtual_uart_param(dev->priv->port_number,
 181                 PARAM_RX_TRIGGER, &val);
 182
 183         if (result) {
 184                 dev_dbg(&dev->core, "%s:%d: rx_trigger failed: %s\n",
 185                         __func__, __LINE__, ps3_result(result));
 186                 return result;
 187         }
 188
 189         trig->rx = size - val;
 190
 191         dev_dbg(&dev->core, "%s:%d: tx %lxh, rx %lxh\n", __func__, __LINE__,
 192                 trig->tx, trig->rx);
 193
 194         return result;
 195 }
 196
 197 int ps3_vuart_set_triggers(struct ps3_vuart_port_device *dev, unsigned int tx,
 198         unsigned int rx)
 199 {
 200         int result;
 201         unsigned long size;
 202
 203         result = lv1_set_virtual_uart_param(dev->priv->port_number,
 204                 PARAM_TX_TRIGGER, tx);
 205
 206         if (result) {
 207                 dev_dbg(&dev->core, "%s:%d: tx_trigger failed: %s\n",
 208                         __func__, __LINE__, ps3_result(result));
 209                 return result;
 210         }
 211
 212         result = lv1_get_virtual_uart_param(dev->priv->port_number,
 213                 PARAM_RX_BUF_SIZE, &size);
 214
 215         if (result) {
 216                 dev_dbg(&dev->core, "%s:%d: tx_buf_size failed: %s\n",
 217                         __func__, __LINE__, ps3_result(result));
 218                 return result;
 219         }
 220
 221         result = lv1_set_virtual_uart_param(dev->priv->port_number,
 222                 PARAM_RX_TRIGGER, size - rx);
 223
 224         if (result) {
 225                 dev_dbg(&dev->core, "%s:%d: rx_trigger failed: %s\n",
 226                         __func__, __LINE__, ps3_result(result));
 227                 return result;
 228         }
 229
 230         dev_dbg(&dev->core, "%s:%d: tx %xh, rx %xh\n", __func__, __LINE__,
 231                 tx, rx);
 232
 233         return result;
 234 }
 235
 236 static int ps3_vuart_get_rx_bytes_waiting(struct ps3_vuart_port_device *dev,
 237         u64 *bytes_waiting)
 238 {
 239         int result = lv1_get_virtual_uart_param(dev->priv->port_number,
 240                 PARAM_RX_BYTES, bytes_waiting);
 241
 242         if (result)
 243                 dev_dbg(&dev->core, "%s:%d: rx_bytes failed: %s\n",
 244                         __func__, __LINE__, ps3_result(result));
 245
 246         dev_dbg(&dev->core, "%s:%d: %lxh\n", __func__, __LINE__,
 247                 *bytes_waiting);
 248         return result;
 249 }
 250
 251 static int ps3_vuart_set_interrupt_mask(struct ps3_vuart_port_device *dev,
 252         unsigned long mask)
 253 {
 254         int result;
 255
 256         dev_dbg(&dev->core, "%s:%d: %lxh\n", __func__, __LINE__, mask);
 257
 258         dev->priv->interrupt_mask = mask;
 259
 260         result = lv1_set_virtual_uart_param(dev->priv->port_number,
 261                 PARAM_INTERRUPT_MASK, dev->priv->interrupt_mask);
 262
 263         if (result)
 264                 dev_dbg(&dev->core, "%s:%d: interrupt_mask failed: %s\n",
 265                         __func__, __LINE__, ps3_result(result));
 266
 267         return result;
 268 }
 269
 270 static int ps3_vuart_get_interrupt_status(struct ps3_vuart_port_device *dev,
 271         unsigned long *status)
 272 {
 273         u64 tmp;
 274         int result = lv1_get_virtual_uart_param(dev->priv->port_number,
 275                 PARAM_INTERRUPT_STATUS, &tmp);
 276
 277         if (result)
 278                 dev_dbg(&dev->core, "%s:%d: interrupt_status failed: %s\n",
 279                         __func__, __LINE__, ps3_result(result));
 280
 281         *status = tmp & dev->priv->interrupt_mask;
 282
 283         dev_dbg(&dev->core, "%s:%d: m %lxh, s %lxh, m&s %lxh\n",
 284                 __func__, __LINE__, dev->priv->interrupt_mask, tmp, *status);
 285
 286         return result;
 287 }
 288
 289 int ps3_vuart_enable_interrupt_tx(struct ps3_vuart_port_device *dev)
 290 {
 291         return (dev->priv->interrupt_mask & INTERRUPT_MASK_TX) ? 0
 292                 : ps3_vuart_set_interrupt_mask(dev, dev->priv->interrupt_mask
 293                 | INTERRUPT_MASK_TX);
 294 }
 295
 296 int ps3_vuart_enable_interrupt_rx(struct ps3_vuart_port_device *dev)
 297 {
 298         return (dev->priv->interrupt_mask & INTERRUPT_MASK_RX) ? 0
 299                 : ps3_vuart_set_interrupt_mask(dev, dev->priv->interrupt_mask
 300                 | INTERRUPT_MASK_RX);
 301 }
 302
 303 int ps3_vuart_enable_interrupt_disconnect(struct ps3_vuart_port_device *dev)
 304 {
 305         return (dev->priv->interrupt_mask & INTERRUPT_MASK_DISCONNECT) ? 0
 306                 : ps3_vuart_set_interrupt_mask(dev, dev->priv->interrupt_mask
 307                 | INTERRUPT_MASK_DISCONNECT);
 308 }
 309
 310 int ps3_vuart_disable_interrupt_tx(struct ps3_vuart_port_device *dev)
 311 {
 312         return (dev->priv->interrupt_mask & INTERRUPT_MASK_TX)
 313                 ? ps3_vuart_set_interrupt_mask(dev, dev->priv->interrupt_mask
 314                 & ~INTERRUPT_MASK_TX) : 0;
 315 }
 316
 317 int ps3_vuart_disable_interrupt_rx(struct ps3_vuart_port_device *dev)
 318 {
 319         return (dev->priv->interrupt_mask & INTERRUPT_MASK_RX)
 320                 ? ps3_vuart_set_interrupt_mask(dev, dev->priv->interrupt_mask
 321                 & ~INTERRUPT_MASK_RX) : 0;
 322 }
 323
 324 int ps3_vuart_disable_interrupt_disconnect(struct ps3_vuart_port_device *dev)
 325 {
 326         return (dev->priv->interrupt_mask & INTERRUPT_MASK_DISCONNECT)
 327                 ? ps3_vuart_set_interrupt_mask(dev, dev->priv->interrupt_mask
 328                 & ~INTERRUPT_MASK_DISCONNECT) : 0;
 329 }
 330
 331 /**
 332  * ps3_vuart_raw_write - Low level write helper.
 333  *
 334  * Do not call ps3_vuart_raw_write directly, use ps3_vuart_write.
 335  */
 336
 337 static int ps3_vuart_raw_write(struct ps3_vuart_port_device *dev,
 338         const void* buf, unsigned int bytes, unsigned long *bytes_written)
 339 {
 340         int result;
 341
 342         result = lv1_write_virtual_uart(dev->priv->port_number,
 343                 ps3_mm_phys_to_lpar(__pa(buf)), bytes, bytes_written);
 344
 345         if (result) {
 346                 dev_dbg(&dev->core, "%s:%d: lv1_write_virtual_uart failed: "
 347                         "%s\n", __func__, __LINE__, ps3_result(result));
 348                 return result;
 349         }
 350
 351         dev->priv->stats.bytes_written += *bytes_written;
 352
 353         dev_dbg(&dev->core, "%s:%d: wrote %lxh/%xh=>%lxh\n", __func__, __LINE__,
 354                 *bytes_written, bytes, dev->priv->stats.bytes_written);
 355
 356         return result;
 357 }
 358
 359 /**
 360  * ps3_vuart_raw_read - Low level read helper.
 361  *
 362  * Do not call ps3_vuart_raw_read directly, use ps3_vuart_read.
 363  */
 364
 365 static int ps3_vuart_raw_read(struct ps3_vuart_port_device *dev, void* buf,
 366         unsigned int bytes, unsigned long *bytes_read)
 367 {
 368         int result;
 369
 370         dev_dbg(&dev->core, "%s:%d: %xh\n", __func__, __LINE__, bytes);
 371
 372         result = lv1_read_virtual_uart(dev->priv->port_number,
 373                 ps3_mm_phys_to_lpar(__pa(buf)), bytes, bytes_read);
 374
 375         if (result) {
 376                 dev_dbg(&dev->core, "%s:%d: lv1_read_virtual_uart failed: %s\n",
 377                         __func__, __LINE__, ps3_result(result));
 378                 return result;
 379         }
 380
 381         dev->priv->stats.bytes_read += *bytes_read;
 382
 383         dev_dbg(&dev->core, "%s:%d: read %lxh/%xh=>%lxh\n", __func__, __LINE__,
 384                 *bytes_read, bytes, dev->priv->stats.bytes_read);
 385
 386         return result;
 387 }
 388
 389 /**
 390  * ps3_vuart_clear_rx_bytes - Discard bytes received.
 391  * @bytes: Max byte count to discard, zero = all pending.
 392  *
 393  * Used to clear pending rx interrupt source.  Will not block.
 394  */
 395
 396 void ps3_vuart_clear_rx_bytes(struct ps3_vuart_port_device *dev,
 397         unsigned int bytes)
 398 {
 399         int result;
 400         u64 bytes_waiting;
 401         void* tmp;
 402
 403         result = ps3_vuart_get_rx_bytes_waiting(dev, &bytes_waiting);
 404
 405         BUG_ON(result);
 406
 407         bytes = bytes ? min(bytes, (unsigned int)bytes_waiting) : bytes_waiting;
 408
 409         dev_dbg(&dev->core, "%s:%d: %u\n", __func__, __LINE__, bytes);
 410
 411         if (!bytes)
 412                 return;
 413
 414         /* Add some extra space for recently arrived data. */
 415
 416         bytes += 128;
 417
 418         tmp = kmalloc(bytes, GFP_KERNEL);
 419
 420         if (!tmp)
 421                 return;
 422
 423         ps3_vuart_raw_read(dev, tmp, bytes, &bytes_waiting);
 424
 425         kfree(tmp);
 426
 427         /* Don't include these bytes in the stats. */
 428
 429         dev->priv->stats.bytes_read -= bytes_waiting;
 430 }
 431
 432 /**
 433  * struct list_buffer - An element for a port device fifo buffer list.
 434  */
 435
 436 struct list_buffer {
 437         struct list_head link;
 438         const unsigned char *head;
 439         const unsigned char *tail;
 440         unsigned long dbg_number;
 441         unsigned char data[];
 442 };
 443
 444 /**
 445  * ps3_vuart_write - the entry point for writing data to a port
 446  *
 447  * If the port is idle on entry as much of the incoming data is written to
 448  * the port as the port will accept.  Otherwise a list buffer is created
 449  * and any remaning incoming data is copied to that buffer.  The buffer is
 450  * then enqueued for transmision via the transmit interrupt.
 451  */
 452
 453 int ps3_vuart_write(struct ps3_vuart_port_device *dev, const void* buf,
 454         unsigned int bytes)
 455 {
 456         static unsigned long dbg_number;
 457         int result;
 458         unsigned long flags;
 459         struct list_buffer *lb;
 460
 461         dev_dbg(&dev->core, "%s:%d: %u(%xh) bytes\n", __func__, __LINE__,
 462                 bytes, bytes);
 463
 464         spin_lock_irqsave(&dev->priv->tx_list.lock, flags);
 465
 466         if (list_empty(&dev->priv->tx_list.head)) {
 467                 unsigned long bytes_written;
 468
 469                 result = ps3_vuart_raw_write(dev, buf, bytes, &bytes_written);
 470
 471                 spin_unlock_irqrestore(&dev->priv->tx_list.lock, flags);
 472
 473                 if (result) {
 474                         dev_dbg(&dev->core,
 475                                 "%s:%d: ps3_vuart_raw_write failed\n",
 476                                 __func__, __LINE__);
 477                         return result;
 478                 }
 479
 480                 if (bytes_written == bytes) {
 481                         dev_dbg(&dev->core, "%s:%d: wrote %xh bytes\n",
 482                                 __func__, __LINE__, bytes);
 483                         return 0;
 484                 }
 485
 486                 bytes -= bytes_written;
 487                 buf += bytes_written;
 488         } else
 489                 spin_unlock_irqrestore(&dev->priv->tx_list.lock, flags);
 490
 491         lb = kmalloc(sizeof(struct list_buffer) + bytes, GFP_KERNEL);
 492
 493         if (!lb) {
 494                 return -ENOMEM;
 495         }
 496
 497         memcpy(lb->data, buf, bytes);
 498         lb->head = lb->data;
 499         lb->tail = lb->data + bytes;
 500         lb->dbg_number = ++dbg_number;
 501
 502         spin_lock_irqsave(&dev->priv->tx_list.lock, flags);
 503         list_add_tail(&lb->link, &dev->priv->tx_list.head);
 504         ps3_vuart_enable_interrupt_tx(dev);
 505         spin_unlock_irqrestore(&dev->priv->tx_list.lock, flags);
 506
 507         dev_dbg(&dev->core, "%s:%d: queued buf_%lu, %xh bytes\n",
 508                 __func__, __LINE__, lb->dbg_number, bytes);
 509
 510         return 0;
 511 }
 512
 513 /**
 514  * ps3_vuart_read - the entry point for reading data from a port
 515  *
 516  * If enough bytes to satisfy the request are held in the buffer list those
 517  * bytes are dequeued and copied to the caller's buffer.  Emptied list buffers
 518  * are retiered.  If the request cannot be statified by bytes held in the list
 519  * buffers -EAGAIN is returned.
 520  */
 521
 522 int ps3_vuart_read(struct ps3_vuart_port_device *dev, void* buf,
 523         unsigned int bytes)
 524 {
 525         unsigned long flags;
 526         struct list_buffer *lb, *n;
 527         unsigned long bytes_read;
 528
 529         dev_dbg(&dev->core, "%s:%d: %u(%xh) bytes\n", __func__, __LINE__,
 530                 bytes, bytes);
 531
 532         spin_lock_irqsave(&dev->priv->rx_list.lock, flags);
 533
 534         if (dev->priv->rx_list.bytes_held < bytes) {
 535                 spin_unlock_irqrestore(&dev->priv->rx_list.lock, flags);
 536                 dev_dbg(&dev->core, "%s:%d: starved for %lxh bytes\n",
 537                         __func__, __LINE__,
 538                         bytes - dev->priv->rx_list.bytes_held);
 539                 return -EAGAIN;
 540         }
 541
 542         list_for_each_entry_safe(lb, n, &dev->priv->rx_list.head, link) {
 543                 bytes_read = min((unsigned int)(lb->tail - lb->head), bytes);
 544
 545                 memcpy(buf, lb->head, bytes_read);
 546                 buf += bytes_read;
 547                 bytes -= bytes_read;
 548                 dev->priv->rx_list.bytes_held -= bytes_read;
 549
 550                 if (bytes_read < lb->tail - lb->head) {
 551                         lb->head += bytes_read;
 552                         dev_dbg(&dev->core, "%s:%d: buf_%lu: dequeued %lxh "
 553                                 "bytes\n", __func__, __LINE__, lb->dbg_number,
 554                                 bytes_read);
 555                         spin_unlock_irqrestore(&dev->priv->rx_list.lock, flags);
 556                         return 0;
 557                 }
 558
 559                 dev_dbg(&dev->core, "%s:%d: buf_%lu: free, dequeued %lxh "
 560                         "bytes\n", __func__, __LINE__, lb->dbg_number,
 561                         bytes_read);
 562
 563                 list_del(&lb->link);
 564                 kfree(lb);
 565         }
 566
 567         spin_unlock_irqrestore(&dev->priv->rx_list.lock, flags);
 568         return 0;
 569 }
 570
 571 int ps3_vuart_read_async(struct ps3_vuart_port_device *dev, work_func_t func,
 572         unsigned int bytes)
 573 {
 574         unsigned long flags;
 575
 576         if(dev->priv->work.trigger) {
 577                 dev_dbg(&dev->core, "%s:%d: warning, multiple calls\n",
 578                         __func__, __LINE__);
 579                 return -EAGAIN;
 580         }
 581
 582         BUG_ON(!bytes);
 583
 584         PREPARE_WORK(&dev->priv->work.work, func);
 585
 586         spin_lock_irqsave(&dev->priv->work.lock, flags);
 587         if(dev->priv->rx_list.bytes_held >= bytes) {
 588                 dev_dbg(&dev->core, "%s:%d: schedule_work %xh bytes\n",
 589                         __func__, __LINE__, bytes);
 590                 schedule_work(&dev->priv->work.work);
 591                 spin_unlock_irqrestore(&dev->priv->work.lock, flags);
 592                 return 0;
 593         }
 594
 595         dev->priv->work.trigger = bytes;
 596         spin_unlock_irqrestore(&dev->priv->work.lock, flags);
 597
 598         dev_dbg(&dev->core, "%s:%d: waiting for %u(%xh) bytes\n", __func__,
 599                 __LINE__, bytes, bytes);
 600
 601         return 0;
 602 }
 603
 604 void ps3_vuart_cancel_async(struct ps3_vuart_port_device *dev)
 605 {
 606         dev->priv->work.trigger = 0;
 607 }
 608
 609 /**
 610  * ps3_vuart_handle_interrupt_tx - third stage transmit interrupt handler
 611  *
 612  * Services the transmit interrupt for the port.  Writes as much data from the
 613  * buffer list as the port will accept.  Retires any emptied list buffers and
 614  * adjusts the final list buffer state for a partial write.
 615  */
 616
 617 static int ps3_vuart_handle_interrupt_tx(struct ps3_vuart_port_device *dev)
 618 {
 619         int result = 0;
 620         unsigned long flags;
 621         struct list_buffer *lb, *n;
 622         unsigned long bytes_total = 0;
 623
 624         dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
 625
 626         spin_lock_irqsave(&dev->priv->tx_list.lock, flags);
 627
 628         list_for_each_entry_safe(lb, n, &dev->priv->tx_list.head, link) {
 629
 630                 unsigned long bytes_written;
 631
 632                 result = ps3_vuart_raw_write(dev, lb->head, lb->tail - lb->head,
 633                         &bytes_written);
 634
 635                 if (result) {
 636                         dev_dbg(&dev->core,
 637                                 "%s:%d: ps3_vuart_raw_write failed\n",
 638                                 __func__, __LINE__);
 639                         break;
 640                 }
 641
 642                 bytes_total += bytes_written;
 643
 644                 if (bytes_written < lb->tail - lb->head) {
 645                         lb->head += bytes_written;
 646                         dev_dbg(&dev->core,
 647                                 "%s:%d cleared buf_%lu, %lxh bytes\n",
 648                                 __func__, __LINE__, lb->dbg_number,
 649                                 bytes_written);
 650                         goto port_full;
 651                 }
 652
 653                 dev_dbg(&dev->core, "%s:%d free buf_%lu\n", __func__, __LINE__,
 654                         lb->dbg_number);
 655
 656                 list_del(&lb->link);
 657                 kfree(lb);
 658         }
 659
 660         ps3_vuart_disable_interrupt_tx(dev);
 661 port_full:
 662         spin_unlock_irqrestore(&dev->priv->tx_list.lock, flags);
 663         dev_dbg(&dev->core, "%s:%d wrote %lxh bytes total\n",
 664                 __func__, __LINE__, bytes_total);
 665         return result;
 666 }
 667
 668 /**
 669  * ps3_vuart_handle_interrupt_rx - third stage receive interrupt handler
 670  *
 671  * Services the receive interrupt for the port.  Creates a list buffer and
 672  * copies all waiting port data to that buffer and enqueues the buffer in the
 673  * buffer list.  Buffer list data is dequeued via ps3_vuart_read.
 674  */
 675
 676 static int ps3_vuart_handle_interrupt_rx(struct ps3_vuart_port_device *dev)
 677 {
 678         static unsigned long dbg_number;
 679         int result = 0;
 680         unsigned long flags;
 681         struct list_buffer *lb;
 682         unsigned long bytes;
 683
 684         dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
 685
 686         result = ps3_vuart_get_rx_bytes_waiting(dev, &bytes);
 687
 688         if (result)
 689                 return -EIO;
 690
 691         BUG_ON(!bytes);
 692
 693         /* Add some extra space for recently arrived data. */
 694
 695         bytes += 128;
 696
 697         lb = kmalloc(sizeof(struct list_buffer) + bytes, GFP_ATOMIC);
 698
 699         if (!lb)
 700                 return -ENOMEM;
 701
 702         ps3_vuart_raw_read(dev, lb->data, bytes, &bytes);
 703
 704         lb->head = lb->data;
 705         lb->tail = lb->data + bytes;
 706         lb->dbg_number = ++dbg_number;
 707
 708         spin_lock_irqsave(&dev->priv->rx_list.lock, flags);
 709         list_add_tail(&lb->link, &dev->priv->rx_list.head);
 710         dev->priv->rx_list.bytes_held += bytes;
 711         spin_unlock_irqrestore(&dev->priv->rx_list.lock, flags);
 712
 713         dev_dbg(&dev->core, "%s:%d: buf_%lu: queued %lxh bytes\n",
 714                 __func__, __LINE__, lb->dbg_number, bytes);
 715
 716         spin_lock_irqsave(&dev->priv->work.lock, flags);
 717         if(dev->priv->work.trigger
 718                 && dev->priv->rx_list.bytes_held >= dev->priv->work.trigger) {
 719                 dev_dbg(&dev->core, "%s:%d: schedule_work %lxh bytes\n",
 720                         __func__, __LINE__, dev->priv->work.trigger);
 721                 dev->priv->work.trigger = 0;
 722                 schedule_work(&dev->priv->work.work);
 723         }
 724         spin_unlock_irqrestore(&dev->priv->work.lock, flags);
 725         return 0;
 726 }
 727
 728 static int ps3_vuart_handle_interrupt_disconnect(
 729         struct ps3_vuart_port_device *dev)
 730 {
 731         dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
 732         BUG_ON("no support");
 733         return -1;
 734 }
 735
 736 /**
 737  * ps3_vuart_handle_port_interrupt - second stage interrupt handler
 738  *
 739  * Services any pending interrupt types for the port.  Passes control to the
 740  * third stage type specific interrupt handler.  Returns control to the first
 741  * stage handler after one iteration.
 742  */
 743
 744 static int ps3_vuart_handle_port_interrupt(struct ps3_vuart_port_device *dev)
 745 {
 746         int result;
 747         unsigned long status;
 748
 749         result = ps3_vuart_get_interrupt_status(dev, &status);
 750
 751         if (result)
 752                 return result;
 753
 754         dev_dbg(&dev->core, "%s:%d: status: %lxh\n", __func__, __LINE__,
 755                 status);
 756
 757         if (status & INTERRUPT_MASK_DISCONNECT) {
 758                 dev->priv->stats.disconnect_interrupts++;
 759                 result = ps3_vuart_handle_interrupt_disconnect(dev);
 760                 if (result)
 761                         ps3_vuart_disable_interrupt_disconnect(dev);
 762         }
 763
 764         if (status & INTERRUPT_MASK_TX) {
 765                 dev->priv->stats.tx_interrupts++;
 766                 result = ps3_vuart_handle_interrupt_tx(dev);
 767                 if (result)
 768                         ps3_vuart_disable_interrupt_tx(dev);
 769         }
 770
 771         if (status & INTERRUPT_MASK_RX) {
 772                 dev->priv->stats.rx_interrupts++;
 773                 result = ps3_vuart_handle_interrupt_rx(dev);
 774                 if (result)
 775                         ps3_vuart_disable_interrupt_rx(dev);
 776         }
 777
 778         return 0;
 779 }
 780
 781 struct vuart_bus_priv {
 782         const struct ports_bmp bmp;
 783         unsigned int virq;
 784         struct semaphore probe_mutex;
 785         int use_count;
 786         struct ps3_vuart_port_device *devices[PORT_COUNT];
 787 } static vuart_bus_priv;
 788
 789 /**
 790  * ps3_vuart_irq_handler - first stage interrupt handler
 791  *
 792  * Loops finding any interrupting port and its associated instance data.
 793  * Passes control to the second stage port specific interrupt handler.  Loops
 794  * until all outstanding interrupts are serviced.
 795  */
 796
 797 static irqreturn_t ps3_vuart_irq_handler(int irq, void *_private)
 798 {
 799         struct vuart_bus_priv *bus_priv;
 800
 801         BUG_ON(!_private);
 802         bus_priv = (struct vuart_bus_priv *)_private;
 803
 804         while (1) {
 805                 unsigned int port;
 806
 807                 dump_ports_bmp(&bus_priv->bmp);
 808
 809                 port = (BITS_PER_LONG - 1) - __ilog2(bus_priv->bmp.status);
 810
 811                 if (port == BITS_PER_LONG)
 812                         break;
 813
 814                 BUG_ON(port >= PORT_COUNT);
 815                 BUG_ON(!bus_priv->devices[port]);
 816
 817                 ps3_vuart_handle_port_interrupt(bus_priv->devices[port]);
 818         }
 819
 820         return IRQ_HANDLED;
 821 }
 822
 823 static int ps3_vuart_match(struct device *_dev, struct device_driver *_drv)
 824 {
 825         int result;
 826         struct ps3_vuart_port_driver *drv = to_ps3_vuart_port_driver(_drv);
 827         struct ps3_vuart_port_device *dev = to_ps3_vuart_port_device(_dev);
 828
 829         result = dev->match_id == drv->match_id;
 830
 831         dev_info(&dev->core, "%s:%d: dev=%u(%s), drv=%u(%s): %s\n", __func__,
 832                 __LINE__, dev->match_id, dev->core.bus_id, drv->match_id,
 833                 drv->core.name, (result ? "match" : "miss"));
 834
 835         return result;
 836 }
 837
 838 static int ps3_vuart_probe(struct device *_dev)
 839 {
 840         int result;
 841         unsigned int port_number;
 842         struct ps3_vuart_port_device *dev = to_ps3_vuart_port_device(_dev);
 843         struct ps3_vuart_port_driver *drv =
 844                 to_ps3_vuart_port_driver(_dev->driver);
 845
 846         dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
 847
 848         BUG_ON(!drv);
 849
 850         down(&vuart_bus_priv.probe_mutex);
 851
 852         /* Setup vuart_bus_priv.devices[]. */
 853
 854         result = ps3_vuart_match_id_to_port(dev->match_id,
 855                 &port_number);
 856
 857         if (result) {
 858                 dev_dbg(&dev->core, "%s:%d: unknown match_id (%d)\n",
 859                         __func__, __LINE__, dev->match_id);
 860                 result = -EINVAL;
 861                 goto fail_match;
 862         }
 863
 864         if (vuart_bus_priv.devices[port_number]) {
 865                 dev_dbg(&dev->core, "%s:%d: port busy (%d)\n", __func__,
 866                         __LINE__, port_number);
 867                 result = -EBUSY;
 868                 goto fail_match;
 869         }
 870
 871         vuart_bus_priv.devices[port_number] = dev;
 872
 873         /* Setup dev->priv. */
 874
 875         dev->priv = kzalloc(sizeof(struct ps3_vuart_port_priv), GFP_KERNEL);
 876
 877         if (!dev->priv) {
 878                 result = -ENOMEM;
 879                 goto fail_alloc;
 880         }
 881
 882         dev->priv->port_number = port_number;
 883
 884         INIT_LIST_HEAD(&dev->priv->tx_list.head);
 885         spin_lock_init(&dev->priv->tx_list.lock);
 886
 887         INIT_LIST_HEAD(&dev->priv->rx_list.head);
 888         spin_lock_init(&dev->priv->rx_list.lock);
 889
 890         INIT_WORK(&dev->priv->work.work, NULL);
 891         spin_lock_init(&dev->priv->work.lock);
 892         dev->priv->work.trigger = 0;
 893         dev->priv->work.dev = dev;
 894
 895         if (++vuart_bus_priv.use_count == 1) {
 896
 897                 result = ps3_alloc_vuart_irq(PS3_BINDING_CPU_ANY,
 898                         (void*)&vuart_bus_priv.bmp.status, &vuart_bus_priv.virq);
 899
 900                 if (result) {
 901                         dev_dbg(&dev->core,
 902                                 "%s:%d: ps3_alloc_vuart_irq failed (%d)\n",
 903                                 __func__, __LINE__, result);
 904                         result = -EPERM;
 905                         goto fail_alloc_irq;
 906                 }
 907
 908                 result = request_irq(vuart_bus_priv.virq, ps3_vuart_irq_handler,
 909                         IRQF_DISABLED, "vuart", &vuart_bus_priv);
 910
 911                 if (result) {
 912                         dev_info(&dev->core, "%s:%d: request_irq failed (%d)\n",
 913                                 __func__, __LINE__, result);
 914                         goto fail_request_irq;
 915                 }
 916         }
 917
 918         /* clear stale pending interrupts */
 919
 920         ps3_vuart_clear_rx_bytes(dev, 0);
 921
 922         ps3_vuart_set_interrupt_mask(dev, INTERRUPT_MASK_RX);
 923
 924         ps3_vuart_set_triggers(dev, 1, 1);
 925
 926         if (drv->probe)
 927                 result = drv->probe(dev);
 928         else {
 929                 result = 0;
 930                 dev_info(&dev->core, "%s:%d: no probe method\n", __func__,
 931                         __LINE__);
 932         }
 933
 934         if (result) {
 935                 dev_dbg(&dev->core, "%s:%d: drv->probe failed\n",
 936                         __func__, __LINE__);
 937                 down(&vuart_bus_priv.probe_mutex);
 938                 goto fail_probe;
 939         }
 940
 941         up(&vuart_bus_priv.probe_mutex);
 942
 943         return result;
 944
 945 fail_probe:
 946         ps3_vuart_set_interrupt_mask(dev, 0);
 947 fail_request_irq:
 948         ps3_free_vuart_irq(vuart_bus_priv.virq);
 949         vuart_bus_priv.virq = NO_IRQ;
 950 fail_alloc_irq:
 951         --vuart_bus_priv.use_count;
 952         kfree(dev->priv);
 953         dev->priv = NULL;
 954 fail_alloc:
 955         vuart_bus_priv.devices[port_number] = NULL;
 956 fail_match:
 957         up(&vuart_bus_priv.probe_mutex);
 958         dev_dbg(&dev->core, "%s:%d failed\n", __func__, __LINE__);
 959         return result;
 960 }
 961
 962 static int ps3_vuart_remove(struct device *_dev)
 963 {
 964         struct ps3_vuart_port_device *dev = to_ps3_vuart_port_device(_dev);
 965         struct ps3_vuart_port_driver *drv =
 966                 to_ps3_vuart_port_driver(_dev->driver);
 967
 968         down(&vuart_bus_priv.probe_mutex);
 969
 970         dev_dbg(&dev->core, "%s:%d: %s\n", __func__, __LINE__,
 971                 dev->core.bus_id);
 972
 973         BUG_ON(vuart_bus_priv.use_count < 1);
 974
 975         if (drv->remove)
 976                 drv->remove(dev);
 977         else
 978                 dev_dbg(&dev->core, "%s:%d: %s no remove method\n", __func__,
 979                         __LINE__, dev->core.bus_id);
 980
 981         vuart_bus_priv.devices[dev->priv->port_number] = NULL;
 982
 983         if (--vuart_bus_priv.use_count == 0) {
 984                 BUG();
 985                 free_irq(vuart_bus_priv.virq, &vuart_bus_priv);
 986                 ps3_free_vuart_irq(vuart_bus_priv.virq);
 987                 vuart_bus_priv.virq = NO_IRQ;
 988         }
 989
 990         kfree(dev->priv);
 991         dev->priv = NULL;
 992
 993         up(&vuart_bus_priv.probe_mutex);
 994         return 0;
 995 }
 996
 997 static void ps3_vuart_shutdown(struct device *_dev)
 998 {
 999         struct ps3_vuart_port_device *dev = to_ps3_vuart_port_device(_dev);
1000         struct ps3_vuart_port_driver *drv =
1001                 to_ps3_vuart_port_driver(_dev->driver);
1002
1003         dev_dbg(&dev->core, "%s:%d: %s\n", __func__, __LINE__,
1004                 dev->core.bus_id);
1005
1006         if (drv->shutdown)
1007                 drv->shutdown(dev);
1008         else
1009                 dev_dbg(&dev->core, "%s:%d: %s no shutdown method\n", __func__,
1010                         __LINE__, dev->core.bus_id);
1011 }
1012
1013 /**
1014  * ps3_vuart_bus - The vuart bus instance.
1015  *
1016  * The vuart is managed as a bus that port devices connect to.
1017  */
1018
1019 struct bus_type ps3_vuart_bus = {
1020         .name = "ps3_vuart",
1021         .match = ps3_vuart_match,
1022         .probe = ps3_vuart_probe,
1023         .remove = ps3_vuart_remove,
1024         .shutdown = ps3_vuart_shutdown,
1025 };
1026
1027 int __init ps3_vuart_bus_init(void)
1028 {
1029         int result;
1030
1031         pr_debug("%s:%d:\n", __func__, __LINE__);
1032
1033         if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
1034                 return -ENODEV;
1035
1036         init_MUTEX(&vuart_bus_priv.probe_mutex);
1037         result = bus_register(&ps3_vuart_bus);
1038         BUG_ON(result);
1039
1040         return result;
1041 }
1042
1043 void __exit ps3_vuart_bus_exit(void)
1044 {
1045         pr_debug("%s:%d:\n", __func__, __LINE__);
1046         bus_unregister(&ps3_vuart_bus);
1047 }
1048
1049 core_initcall(ps3_vuart_bus_init);
1050 module_exit(ps3_vuart_bus_exit);
1051
1052 /**
1053  * ps3_vuart_port_release_device - Remove a vuart port device.
1054  */
1055
1056 static void ps3_vuart_port_release_device(struct device *_dev)
1057 {
1058 #if defined(DEBUG)
1059         struct ps3_vuart_port_device *dev = to_ps3_vuart_port_device(_dev);
1060
1061         dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
1062
1063         BUG_ON(dev->priv && "forgot to free");
1064         memset(&dev->core, 0, sizeof(dev->core));
1065 #endif
1066 }
1067
1068 /**
1069  * ps3_vuart_port_device_register - Add a vuart port device.
1070  */
1071
1072 int ps3_vuart_port_device_register(struct ps3_vuart_port_device *dev)
1073 {
1074         static unsigned int dev_count = 1;
1075
1076         BUG_ON(dev->priv && "forgot to free");
1077
1078         dev->core.parent = NULL;
1079         dev->core.bus = &ps3_vuart_bus;
1080         dev->core.release = ps3_vuart_port_release_device;
1081
1082         snprintf(dev->core.bus_id, sizeof(dev->core.bus_id), "vuart_%02x",
1083                 dev_count++);
1084
1085         dev_dbg(&dev->core, "%s:%d register\n", __func__, __LINE__);
1086
1087         return device_register(&dev->core);
1088 }
1089
1090 EXPORT_SYMBOL_GPL(ps3_vuart_port_device_register);
1091
1092 /**
1093  * ps3_vuart_port_driver_register - Add a vuart port device driver.
1094  */
1095
1096 int ps3_vuart_port_driver_register(struct ps3_vuart_port_driver *drv)
1097 {
1098         int result;
1099
1100         pr_debug("%s:%d: (%s)\n", __func__, __LINE__, drv->core.name);
1101         drv->core.bus = &ps3_vuart_bus;
1102         result = driver_register(&drv->core);
1103         return result;
1104 }
1105
1106 EXPORT_SYMBOL_GPL(ps3_vuart_port_driver_register);
1107
1108 /**
1109  * ps3_vuart_port_driver_unregister - Remove a vuart port device driver.
1110  */
1111
1112 void ps3_vuart_port_driver_unregister(struct ps3_vuart_port_driver *drv)
1113 {
1114         pr_debug("%s:%d: (%s)\n", __func__, __LINE__, drv->core.name);
1115         driver_unregister(&drv->core);
1116 }
1117
1118 EXPORT_SYMBOL_GPL(ps3_vuart_port_driver_unregister);