drivers/pci/switch/switchtec.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Microsemi Switchtec(tm) PCIe Management Driver
   4  * Copyright (c) 2017, Microsemi Corporation
   5  */
   6
   7 #include <linux/switchtec.h>
   8 #include <linux/switchtec_ioctl.h>
   9
  10 #include <linux/interrupt.h>
  11 #include <linux/module.h>
  12 #include <linux/fs.h>
  13 #include <linux/uaccess.h>
  14 #include <linux/poll.h>
  15 #include <linux/wait.h>
  16 #include <linux/io-64-nonatomic-lo-hi.h>
  17 #include <linux/nospec.h>
  18
  19 MODULE_DESCRIPTION("Microsemi Switchtec(tm) PCIe Management Driver");
  20 MODULE_VERSION("0.1");
  21 MODULE_LICENSE("GPL");
  22 MODULE_AUTHOR("Microsemi Corporation");
  23
  24 static int max_devices = 16;
  25 module_param(max_devices, int, 0644);
  26 MODULE_PARM_DESC(max_devices, "max number of switchtec device instances");
  27
  28 static bool use_dma_mrpc = 1;
  29 module_param(use_dma_mrpc, bool, 0644);
  30 MODULE_PARM_DESC(use_dma_mrpc,
  31                  "Enable the use of the DMA MRPC feature");
  32
  33 static dev_t switchtec_devt;
  34 static DEFINE_IDA(switchtec_minor_ida);
  35
  36 struct class *switchtec_class;
  37 EXPORT_SYMBOL_GPL(switchtec_class);
  38
  39 enum mrpc_state {
  40         MRPC_IDLE = 0,
  41         MRPC_QUEUED,
  42         MRPC_RUNNING,
  43         MRPC_DONE,
  44 };
  45
  46 struct switchtec_user {
  47         struct switchtec_dev *stdev;
  48
  49         enum mrpc_state state;
  50
  51         struct completion comp;
  52         struct kref kref;
  53         struct list_head list;
  54
  55         u32 cmd;
  56         u32 status;
  57         u32 return_code;
  58         size_t data_len;
  59         size_t read_len;
  60         unsigned char data[SWITCHTEC_MRPC_PAYLOAD_SIZE];
  61         int event_cnt;
  62 };
  63
  64 static struct switchtec_user *stuser_create(struct switchtec_dev *stdev)
  65 {
  66         struct switchtec_user *stuser;
  67
  68         stuser = kzalloc(sizeof(*stuser), GFP_KERNEL);
  69         if (!stuser)
  70                 return ERR_PTR(-ENOMEM);
  71
  72         get_device(&stdev->dev);
  73         stuser->stdev = stdev;
  74         kref_init(&stuser->kref);
  75         INIT_LIST_HEAD(&stuser->list);
  76         init_completion(&stuser->comp);
  77         stuser->event_cnt = atomic_read(&stdev->event_cnt);
  78
  79         dev_dbg(&stdev->dev, "%s: %p\n", __func__, stuser);
  80
  81         return stuser;
  82 }
  83
  84 static void stuser_free(struct kref *kref)
  85 {
  86         struct switchtec_user *stuser;
  87
  88         stuser = container_of(kref, struct switchtec_user, kref);
  89
  90         dev_dbg(&stuser->stdev->dev, "%s: %p\n", __func__, stuser);
  91
  92         put_device(&stuser->stdev->dev);
  93         kfree(stuser);
  94 }
  95
  96 static void stuser_put(struct switchtec_user *stuser)
  97 {
  98         kref_put(&stuser->kref, stuser_free);
  99 }
 100
 101 static void stuser_set_state(struct switchtec_user *stuser,
 102                              enum mrpc_state state)
 103 {
 104         /* requires the mrpc_mutex to already be held when called */
 105
 106         const char * const state_names[] = {
 107                 [MRPC_IDLE] = "IDLE",
 108                 [MRPC_QUEUED] = "QUEUED",
 109                 [MRPC_RUNNING] = "RUNNING",
 110                 [MRPC_DONE] = "DONE",
 111         };
 112
 113         stuser->state = state;
 114
 115         dev_dbg(&stuser->stdev->dev, "stuser state %p -> %s",
 116                 stuser, state_names[state]);
 117 }
 118
 119 static void mrpc_complete_cmd(struct switchtec_dev *stdev);
 120
 121 static void flush_wc_buf(struct switchtec_dev *stdev)
 122 {
 123         struct ntb_dbmsg_regs __iomem *mmio_dbmsg;
 124
 125         /*
 126          * odb (outbound doorbell) register is processed by low latency
 127          * hardware and w/o side effect
 128          */
 129         mmio_dbmsg = (void __iomem *)stdev->mmio_ntb +
 130                 SWITCHTEC_NTB_REG_DBMSG_OFFSET;
 131         ioread32(&mmio_dbmsg->odb);
 132 }
 133
 134 static void mrpc_cmd_submit(struct switchtec_dev *stdev)
 135 {
 136         /* requires the mrpc_mutex to already be held when called */
 137
 138         struct switchtec_user *stuser;
 139
 140         if (stdev->mrpc_busy)
 141                 return;
 142
 143         if (list_empty(&stdev->mrpc_queue))
 144                 return;
 145
 146         stuser = list_entry(stdev->mrpc_queue.next, struct switchtec_user,
 147                             list);
 148
 149         if (stdev->dma_mrpc) {
 150                 stdev->dma_mrpc->status = SWITCHTEC_MRPC_STATUS_INPROGRESS;
 151                 memset(stdev->dma_mrpc->data, 0xFF, SWITCHTEC_MRPC_PAYLOAD_SIZE);
 152         }
 153
 154         stuser_set_state(stuser, MRPC_RUNNING);
 155         stdev->mrpc_busy = 1;
 156         memcpy_toio(&stdev->mmio_mrpc->input_data,
 157                     stuser->data, stuser->data_len);
 158         flush_wc_buf(stdev);
 159         iowrite32(stuser->cmd, &stdev->mmio_mrpc->cmd);
 160
 161         schedule_delayed_work(&stdev->mrpc_timeout,
 162                               msecs_to_jiffies(500));
 163 }
 164
 165 static int mrpc_queue_cmd(struct switchtec_user *stuser)
 166 {
 167         /* requires the mrpc_mutex to already be held when called */
 168
 169         struct switchtec_dev *stdev = stuser->stdev;
 170
 171         kref_get(&stuser->kref);
 172         stuser->read_len = sizeof(stuser->data);
 173         stuser_set_state(stuser, MRPC_QUEUED);
 174         init_completion(&stuser->comp);
 175         list_add_tail(&stuser->list, &stdev->mrpc_queue);
 176
 177         mrpc_cmd_submit(stdev);
 178
 179         return 0;
 180 }
 181
 182 static void mrpc_complete_cmd(struct switchtec_dev *stdev)
 183 {
 184         /* requires the mrpc_mutex to already be held when called */
 185         struct switchtec_user *stuser;
 186
 187         if (list_empty(&stdev->mrpc_queue))
 188                 return;
 189
 190         stuser = list_entry(stdev->mrpc_queue.next, struct switchtec_user,
 191                             list);
 192
 193         if (stdev->dma_mrpc)
 194                 stuser->status = stdev->dma_mrpc->status;
 195         else
 196                 stuser->status = ioread32(&stdev->mmio_mrpc->status);
 197
 198         if (stuser->status == SWITCHTEC_MRPC_STATUS_INPROGRESS)
 199                 return;
 200
 201         stuser_set_state(stuser, MRPC_DONE);
 202         stuser->return_code = 0;
 203
 204         if (stuser->status != SWITCHTEC_MRPC_STATUS_DONE)
 205                 goto out;
 206
 207         if (stdev->dma_mrpc)
 208                 stuser->return_code = stdev->dma_mrpc->rtn_code;
 209         else
 210                 stuser->return_code = ioread32(&stdev->mmio_mrpc->ret_value);
 211         if (stuser->return_code != 0)
 212                 goto out;
 213
 214         if (stdev->dma_mrpc)
 215                 memcpy(stuser->data, &stdev->dma_mrpc->data,
 216                               stuser->read_len);
 217         else
 218                 memcpy_fromio(stuser->data, &stdev->mmio_mrpc->output_data,
 219                               stuser->read_len);
 220 out:
 221         complete_all(&stuser->comp);
 222         list_del_init(&stuser->list);
 223         stuser_put(stuser);
 224         stdev->mrpc_busy = 0;
 225
 226         mrpc_cmd_submit(stdev);
 227 }
 228
 229 static void mrpc_event_work(struct work_struct *work)
 230 {
 231         struct switchtec_dev *stdev;
 232
 233         stdev = container_of(work, struct switchtec_dev, mrpc_work);
 234
 235         dev_dbg(&stdev->dev, "%s\n", __func__);
 236
 237         mutex_lock(&stdev->mrpc_mutex);
 238         cancel_delayed_work(&stdev->mrpc_timeout);
 239         mrpc_complete_cmd(stdev);
 240         mutex_unlock(&stdev->mrpc_mutex);
 241 }
 242
 243 static void mrpc_timeout_work(struct work_struct *work)
 244 {
 245         struct switchtec_dev *stdev;
 246         u32 status;
 247
 248         stdev = container_of(work, struct switchtec_dev, mrpc_timeout.work);
 249
 250         dev_dbg(&stdev->dev, "%s\n", __func__);
 251
 252         mutex_lock(&stdev->mrpc_mutex);
 253
 254         if (stdev->dma_mrpc)
 255                 status = stdev->dma_mrpc->status;
 256         else
 257                 status = ioread32(&stdev->mmio_mrpc->status);
 258         if (status == SWITCHTEC_MRPC_STATUS_INPROGRESS) {
 259                 schedule_delayed_work(&stdev->mrpc_timeout,
 260                                       msecs_to_jiffies(500));
 261                 goto out;
 262         }
 263
 264         mrpc_complete_cmd(stdev);
 265 out:
 266         mutex_unlock(&stdev->mrpc_mutex);
 267 }
 268
 269 static ssize_t device_version_show(struct device *dev,
 270         struct device_attribute *attr, char *buf)
 271 {
 272         struct switchtec_dev *stdev = to_stdev(dev);
 273         u32 ver;
 274
 275         ver = ioread32(&stdev->mmio_sys_info->device_version);
 276
 277         return sprintf(buf, "%x\n", ver);
 278 }
 279 static DEVICE_ATTR_RO(device_version);
 280
 281 static ssize_t fw_version_show(struct device *dev,
 282         struct device_attribute *attr, char *buf)
 283 {
 284         struct switchtec_dev *stdev = to_stdev(dev);
 285         u32 ver;
 286
 287         ver = ioread32(&stdev->mmio_sys_info->firmware_version);
 288
 289         return sprintf(buf, "%08x\n", ver);
 290 }
 291 static DEVICE_ATTR_RO(fw_version);
 292
 293 static ssize_t io_string_show(char *buf, void __iomem *attr, size_t len)
 294 {
 295         int i;
 296
 297         memcpy_fromio(buf, attr, len);
 298         buf[len] = '\n';
 299         buf[len + 1] = 0;
 300
 301         for (i = len - 1; i > 0; i--) {
 302                 if (buf[i] != ' ')
 303                         break;
 304                 buf[i] = '\n';
 305                 buf[i + 1] = 0;
 306         }
 307
 308         return strlen(buf);
 309 }
 310
 311 #define DEVICE_ATTR_SYS_INFO_STR(field) \
 312 static ssize_t field ## _show(struct device *dev, \
 313         struct device_attribute *attr, char *buf) \
 314 { \
 315         struct switchtec_dev *stdev = to_stdev(dev); \
 316         return io_string_show(buf, &stdev->mmio_sys_info->field, \
 317                             sizeof(stdev->mmio_sys_info->field)); \
 318 } \
 319 \
 320 static DEVICE_ATTR_RO(field)
 321
 322 DEVICE_ATTR_SYS_INFO_STR(vendor_id);
 323 DEVICE_ATTR_SYS_INFO_STR(product_id);
 324 DEVICE_ATTR_SYS_INFO_STR(product_revision);
 325 DEVICE_ATTR_SYS_INFO_STR(component_vendor);
 326
 327 static ssize_t component_id_show(struct device *dev,
 328         struct device_attribute *attr, char *buf)
 329 {
 330         struct switchtec_dev *stdev = to_stdev(dev);
 331         int id = ioread16(&stdev->mmio_sys_info->component_id);
 332
 333         return sprintf(buf, "PM%04X\n", id);
 334 }
 335 static DEVICE_ATTR_RO(component_id);
 336
 337 static ssize_t component_revision_show(struct device *dev,
 338         struct device_attribute *attr, char *buf)
 339 {
 340         struct switchtec_dev *stdev = to_stdev(dev);
 341         int rev = ioread8(&stdev->mmio_sys_info->component_revision);
 342
 343         return sprintf(buf, "%d\n", rev);
 344 }
 345 static DEVICE_ATTR_RO(component_revision);
 346
 347 static ssize_t partition_show(struct device *dev,
 348         struct device_attribute *attr, char *buf)
 349 {
 350         struct switchtec_dev *stdev = to_stdev(dev);
 351
 352         return sprintf(buf, "%d\n", stdev->partition);
 353 }
 354 static DEVICE_ATTR_RO(partition);
 355
 356 static ssize_t partition_count_show(struct device *dev,
 357         struct device_attribute *attr, char *buf)
 358 {
 359         struct switchtec_dev *stdev = to_stdev(dev);
 360
 361         return sprintf(buf, "%d\n", stdev->partition_count);
 362 }
 363 static DEVICE_ATTR_RO(partition_count);
 364
 365 static struct attribute *switchtec_device_attrs[] = {
 366         &dev_attr_device_version.attr,
 367         &dev_attr_fw_version.attr,
 368         &dev_attr_vendor_id.attr,
 369         &dev_attr_product_id.attr,
 370         &dev_attr_product_revision.attr,
 371         &dev_attr_component_vendor.attr,
 372         &dev_attr_component_id.attr,
 373         &dev_attr_component_revision.attr,
 374         &dev_attr_partition.attr,
 375         &dev_attr_partition_count.attr,
 376         NULL,
 377 };
 378
 379 ATTRIBUTE_GROUPS(switchtec_device);
 380
 381 static int switchtec_dev_open(struct inode *inode, struct file *filp)
 382 {
 383         struct switchtec_dev *stdev;
 384         struct switchtec_user *stuser;
 385
 386         stdev = container_of(inode->i_cdev, struct switchtec_dev, cdev);
 387
 388         stuser = stuser_create(stdev);
 389         if (IS_ERR(stuser))
 390                 return PTR_ERR(stuser);
 391
 392         filp->private_data = stuser;
 393         stream_open(inode, filp);
 394
 395         dev_dbg(&stdev->dev, "%s: %p\n", __func__, stuser);
 396
 397         return 0;
 398 }
 399
 400 static int switchtec_dev_release(struct inode *inode, struct file *filp)
 401 {
 402         struct switchtec_user *stuser = filp->private_data;
 403
 404         stuser_put(stuser);
 405
 406         return 0;
 407 }
 408
 409 static int lock_mutex_and_test_alive(struct switchtec_dev *stdev)
 410 {
 411         if (mutex_lock_interruptible(&stdev->mrpc_mutex))
 412                 return -EINTR;
 413
 414         if (!stdev->alive) {
 415                 mutex_unlock(&stdev->mrpc_mutex);
 416                 return -ENODEV;
 417         }
 418
 419         return 0;
 420 }
 421
 422 static ssize_t switchtec_dev_write(struct file *filp, const char __user *data,
 423                                    size_t size, loff_t *off)
 424 {
 425         struct switchtec_user *stuser = filp->private_data;
 426         struct switchtec_dev *stdev = stuser->stdev;
 427         int rc;
 428
 429         if (size < sizeof(stuser->cmd) ||
 430             size > sizeof(stuser->cmd) + sizeof(stuser->data))
 431                 return -EINVAL;
 432
 433         stuser->data_len = size - sizeof(stuser->cmd);
 434
 435         rc = lock_mutex_and_test_alive(stdev);
 436         if (rc)
 437                 return rc;
 438
 439         if (stuser->state != MRPC_IDLE) {
 440                 rc = -EBADE;
 441                 goto out;
 442         }
 443
 444         rc = copy_from_user(&stuser->cmd, data, sizeof(stuser->cmd));
 445         if (rc) {
 446                 rc = -EFAULT;
 447                 goto out;
 448         }
 449
 450         data += sizeof(stuser->cmd);
 451         rc = copy_from_user(&stuser->data, data, size - sizeof(stuser->cmd));
 452         if (rc) {
 453                 rc = -EFAULT;
 454                 goto out;
 455         }
 456
 457         rc = mrpc_queue_cmd(stuser);
 458
 459 out:
 460         mutex_unlock(&stdev->mrpc_mutex);
 461
 462         if (rc)
 463                 return rc;
 464
 465         return size;
 466 }
 467
 468 static ssize_t switchtec_dev_read(struct file *filp, char __user *data,
 469                                   size_t size, loff_t *off)
 470 {
 471         struct switchtec_user *stuser = filp->private_data;
 472         struct switchtec_dev *stdev = stuser->stdev;
 473         int rc;
 474
 475         if (size < sizeof(stuser->cmd) ||
 476             size > sizeof(stuser->cmd) + sizeof(stuser->data))
 477                 return -EINVAL;
 478
 479         rc = lock_mutex_and_test_alive(stdev);
 480         if (rc)
 481                 return rc;
 482
 483         if (stuser->state == MRPC_IDLE) {
 484                 mutex_unlock(&stdev->mrpc_mutex);
 485                 return -EBADE;
 486         }
 487
 488         stuser->read_len = size - sizeof(stuser->return_code);
 489
 490         mutex_unlock(&stdev->mrpc_mutex);
 491
 492         if (filp->f_flags & O_NONBLOCK) {
 493                 if (!try_wait_for_completion(&stuser->comp))
 494                         return -EAGAIN;
 495         } else {
 496                 rc = wait_for_completion_interruptible(&stuser->comp);
 497                 if (rc < 0)
 498                         return rc;
 499         }
 500
 501         rc = lock_mutex_and_test_alive(stdev);
 502         if (rc)
 503                 return rc;
 504
 505         if (stuser->state != MRPC_DONE) {
 506                 mutex_unlock(&stdev->mrpc_mutex);
 507                 return -EBADE;
 508         }
 509
 510         rc = copy_to_user(data, &stuser->return_code,
 511                           sizeof(stuser->return_code));
 512         if (rc) {
 513                 rc = -EFAULT;
 514                 goto out;
 515         }
 516
 517         data += sizeof(stuser->return_code);
 518         rc = copy_to_user(data, &stuser->data,
 519                           size - sizeof(stuser->return_code));
 520         if (rc) {
 521                 rc = -EFAULT;
 522                 goto out;
 523         }
 524
 525         stuser_set_state(stuser, MRPC_IDLE);
 526
 527 out:
 528         mutex_unlock(&stdev->mrpc_mutex);
 529
 530         if (stuser->status == SWITCHTEC_MRPC_STATUS_DONE)
 531                 return size;
 532         else if (stuser->status == SWITCHTEC_MRPC_STATUS_INTERRUPTED)
 533                 return -ENXIO;
 534         else
 535                 return -EBADMSG;
 536 }
 537
 538 static __poll_t switchtec_dev_poll(struct file *filp, poll_table *wait)
 539 {
 540         struct switchtec_user *stuser = filp->private_data;
 541         struct switchtec_dev *stdev = stuser->stdev;
 542         __poll_t ret = 0;
 543
 544         poll_wait(filp, &stuser->comp.wait, wait);
 545         poll_wait(filp, &stdev->event_wq, wait);
 546
 547         if (lock_mutex_and_test_alive(stdev))
 548                 return EPOLLIN | EPOLLRDHUP | EPOLLOUT | EPOLLERR | EPOLLHUP;
 549
 550         mutex_unlock(&stdev->mrpc_mutex);
 551
 552         if (try_wait_for_completion(&stuser->comp))
 553                 ret |= EPOLLIN | EPOLLRDNORM;
 554
 555         if (stuser->event_cnt != atomic_read(&stdev->event_cnt))
 556                 ret |= EPOLLPRI | EPOLLRDBAND;
 557
 558         return ret;
 559 }
 560
 561 static int ioctl_flash_info(struct switchtec_dev *stdev,
 562                             struct switchtec_ioctl_flash_info __user *uinfo)
 563 {
 564         struct switchtec_ioctl_flash_info info = {0};
 565         struct flash_info_regs __iomem *fi = stdev->mmio_flash_info;
 566
 567         info.flash_length = ioread32(&fi->flash_length);
 568         info.num_partitions = SWITCHTEC_IOCTL_NUM_PARTITIONS;
 569
 570         if (copy_to_user(uinfo, &info, sizeof(info)))
 571                 return -EFAULT;
 572
 573         return 0;
 574 }
 575
 576 static void set_fw_info_part(struct switchtec_ioctl_flash_part_info *info,
 577                              struct partition_info __iomem *pi)
 578 {
 579         info->address = ioread32(&pi->address);
 580         info->length = ioread32(&pi->length);
 581 }
 582
 583 static int ioctl_flash_part_info(struct switchtec_dev *stdev,
 584         struct switchtec_ioctl_flash_part_info __user *uinfo)
 585 {
 586         struct switchtec_ioctl_flash_part_info info = {0};
 587         struct flash_info_regs __iomem *fi = stdev->mmio_flash_info;
 588         struct sys_info_regs __iomem *si = stdev->mmio_sys_info;
 589         u32 active_addr = -1;
 590
 591         if (copy_from_user(&info, uinfo, sizeof(info)))
 592                 return -EFAULT;
 593
 594         switch (info.flash_partition) {
 595         case SWITCHTEC_IOCTL_PART_CFG0:
 596                 active_addr = ioread32(&fi->active_cfg);
 597                 set_fw_info_part(&info, &fi->cfg0);
 598                 if (ioread16(&si->cfg_running) == SWITCHTEC_CFG0_RUNNING)
 599                         info.active |= SWITCHTEC_IOCTL_PART_RUNNING;
 600                 break;
 601         case SWITCHTEC_IOCTL_PART_CFG1:
 602                 active_addr = ioread32(&fi->active_cfg);
 603                 set_fw_info_part(&info, &fi->cfg1);
 604                 if (ioread16(&si->cfg_running) == SWITCHTEC_CFG1_RUNNING)
 605                         info.active |= SWITCHTEC_IOCTL_PART_RUNNING;
 606                 break;
 607         case SWITCHTEC_IOCTL_PART_IMG0:
 608                 active_addr = ioread32(&fi->active_img);
 609                 set_fw_info_part(&info, &fi->img0);
 610                 if (ioread16(&si->img_running) == SWITCHTEC_IMG0_RUNNING)
 611                         info.active |= SWITCHTEC_IOCTL_PART_RUNNING;
 612                 break;
 613         case SWITCHTEC_IOCTL_PART_IMG1:
 614                 active_addr = ioread32(&fi->active_img);
 615                 set_fw_info_part(&info, &fi->img1);
 616                 if (ioread16(&si->img_running) == SWITCHTEC_IMG1_RUNNING)
 617                         info.active |= SWITCHTEC_IOCTL_PART_RUNNING;
 618                 break;
 619         case SWITCHTEC_IOCTL_PART_NVLOG:
 620                 set_fw_info_part(&info, &fi->nvlog);
 621                 break;
 622         case SWITCHTEC_IOCTL_PART_VENDOR0:
 623                 set_fw_info_part(&info, &fi->vendor[0]);
 624                 break;
 625         case SWITCHTEC_IOCTL_PART_VENDOR1:
 626                 set_fw_info_part(&info, &fi->vendor[1]);
 627                 break;
 628         case SWITCHTEC_IOCTL_PART_VENDOR2:
 629                 set_fw_info_part(&info, &fi->vendor[2]);
 630                 break;
 631         case SWITCHTEC_IOCTL_PART_VENDOR3:
 632                 set_fw_info_part(&info, &fi->vendor[3]);
 633                 break;
 634         case SWITCHTEC_IOCTL_PART_VENDOR4:
 635                 set_fw_info_part(&info, &fi->vendor[4]);
 636                 break;
 637         case SWITCHTEC_IOCTL_PART_VENDOR5:
 638                 set_fw_info_part(&info, &fi->vendor[5]);
 639                 break;
 640         case SWITCHTEC_IOCTL_PART_VENDOR6:
 641                 set_fw_info_part(&info, &fi->vendor[6]);
 642                 break;
 643         case SWITCHTEC_IOCTL_PART_VENDOR7:
 644                 set_fw_info_part(&info, &fi->vendor[7]);
 645                 break;
 646         default:
 647                 return -EINVAL;
 648         }
 649
 650         if (info.address == active_addr)
 651                 info.active |= SWITCHTEC_IOCTL_PART_ACTIVE;
 652
 653         if (copy_to_user(uinfo, &info, sizeof(info)))
 654                 return -EFAULT;
 655
 656         return 0;
 657 }
 658
 659 static int ioctl_event_summary(struct switchtec_dev *stdev,
 660         struct switchtec_user *stuser,
 661         struct switchtec_ioctl_event_summary __user *usum,
 662         size_t size)
 663 {
 664         struct switchtec_ioctl_event_summary *s;
 665         int i;
 666         u32 reg;
 667         int ret = 0;
 668
 669         s = kzalloc(sizeof(*s), GFP_KERNEL);
 670         if (!s)
 671                 return -ENOMEM;
 672
 673         s->global = ioread32(&stdev->mmio_sw_event->global_summary);
 674         s->part_bitmap = ioread32(&stdev->mmio_sw_event->part_event_bitmap);
 675         s->local_part = ioread32(&stdev->mmio_part_cfg->part_event_summary);
 676
 677         for (i = 0; i < stdev->partition_count; i++) {
 678                 reg = ioread32(&stdev->mmio_part_cfg_all[i].part_event_summary);
 679                 s->part[i] = reg;
 680         }
 681
 682         for (i = 0; i < SWITCHTEC_MAX_PFF_CSR; i++) {
 683                 reg = ioread16(&stdev->mmio_pff_csr[i].vendor_id);
 684                 if (reg != PCI_VENDOR_ID_MICROSEMI)
 685                         break;
 686
 687                 reg = ioread32(&stdev->mmio_pff_csr[i].pff_event_summary);
 688                 s->pff[i] = reg;
 689         }
 690
 691         if (copy_to_user(usum, s, size)) {
 692                 ret = -EFAULT;
 693                 goto error_case;
 694         }
 695
 696         stuser->event_cnt = atomic_read(&stdev->event_cnt);
 697
 698 error_case:
 699         kfree(s);
 700         return ret;
 701 }
 702
 703 static u32 __iomem *global_ev_reg(struct switchtec_dev *stdev,
 704                                   size_t offset, int index)
 705 {
 706         return (void __iomem *)stdev->mmio_sw_event + offset;
 707 }
 708
 709 static u32 __iomem *part_ev_reg(struct switchtec_dev *stdev,
 710                                 size_t offset, int index)
 711 {
 712         return (void __iomem *)&stdev->mmio_part_cfg_all[index] + offset;
 713 }
 714
 715 static u32 __iomem *pff_ev_reg(struct switchtec_dev *stdev,
 716                                size_t offset, int index)
 717 {
 718         return (void __iomem *)&stdev->mmio_pff_csr[index] + offset;
 719 }
 720
 721 #define EV_GLB(i, r)[i] = {offsetof(struct sw_event_regs, r), global_ev_reg}
 722 #define EV_PAR(i, r)[i] = {offsetof(struct part_cfg_regs, r), part_ev_reg}
 723 #define EV_PFF(i, r)[i] = {offsetof(struct pff_csr_regs, r), pff_ev_reg}
 724
 725 static const struct event_reg {
 726         size_t offset;
 727         u32 __iomem *(*map_reg)(struct switchtec_dev *stdev,
 728                                 size_t offset, int index);
 729 } event_regs[] = {
 730         EV_GLB(SWITCHTEC_IOCTL_EVENT_STACK_ERROR, stack_error_event_hdr),
 731         EV_GLB(SWITCHTEC_IOCTL_EVENT_PPU_ERROR, ppu_error_event_hdr),
 732         EV_GLB(SWITCHTEC_IOCTL_EVENT_ISP_ERROR, isp_error_event_hdr),
 733         EV_GLB(SWITCHTEC_IOCTL_EVENT_SYS_RESET, sys_reset_event_hdr),
 734         EV_GLB(SWITCHTEC_IOCTL_EVENT_FW_EXC, fw_exception_hdr),
 735         EV_GLB(SWITCHTEC_IOCTL_EVENT_FW_NMI, fw_nmi_hdr),
 736         EV_GLB(SWITCHTEC_IOCTL_EVENT_FW_NON_FATAL, fw_non_fatal_hdr),
 737         EV_GLB(SWITCHTEC_IOCTL_EVENT_FW_FATAL, fw_fatal_hdr),
 738         EV_GLB(SWITCHTEC_IOCTL_EVENT_TWI_MRPC_COMP, twi_mrpc_comp_hdr),
 739         EV_GLB(SWITCHTEC_IOCTL_EVENT_TWI_MRPC_COMP_ASYNC,
 740                twi_mrpc_comp_async_hdr),
 741         EV_GLB(SWITCHTEC_IOCTL_EVENT_CLI_MRPC_COMP, cli_mrpc_comp_hdr),
 742         EV_GLB(SWITCHTEC_IOCTL_EVENT_CLI_MRPC_COMP_ASYNC,
 743                cli_mrpc_comp_async_hdr),
 744         EV_GLB(SWITCHTEC_IOCTL_EVENT_GPIO_INT, gpio_interrupt_hdr),
 745         EV_GLB(SWITCHTEC_IOCTL_EVENT_GFMS, gfms_event_hdr),
 746         EV_PAR(SWITCHTEC_IOCTL_EVENT_PART_RESET, part_reset_hdr),
 747         EV_PAR(SWITCHTEC_IOCTL_EVENT_MRPC_COMP, mrpc_comp_hdr),
 748         EV_PAR(SWITCHTEC_IOCTL_EVENT_MRPC_COMP_ASYNC, mrpc_comp_async_hdr),
 749         EV_PAR(SWITCHTEC_IOCTL_EVENT_DYN_PART_BIND_COMP, dyn_binding_hdr),
 750         EV_PFF(SWITCHTEC_IOCTL_EVENT_AER_IN_P2P, aer_in_p2p_hdr),
 751         EV_PFF(SWITCHTEC_IOCTL_EVENT_AER_IN_VEP, aer_in_vep_hdr),
 752         EV_PFF(SWITCHTEC_IOCTL_EVENT_DPC, dpc_hdr),
 753         EV_PFF(SWITCHTEC_IOCTL_EVENT_CTS, cts_hdr),
 754         EV_PFF(SWITCHTEC_IOCTL_EVENT_HOTPLUG, hotplug_hdr),
 755         EV_PFF(SWITCHTEC_IOCTL_EVENT_IER, ier_hdr),
 756         EV_PFF(SWITCHTEC_IOCTL_EVENT_THRESH, threshold_hdr),
 757         EV_PFF(SWITCHTEC_IOCTL_EVENT_POWER_MGMT, power_mgmt_hdr),
 758         EV_PFF(SWITCHTEC_IOCTL_EVENT_TLP_THROTTLING, tlp_throttling_hdr),
 759         EV_PFF(SWITCHTEC_IOCTL_EVENT_FORCE_SPEED, force_speed_hdr),
 760         EV_PFF(SWITCHTEC_IOCTL_EVENT_CREDIT_TIMEOUT, credit_timeout_hdr),
 761         EV_PFF(SWITCHTEC_IOCTL_EVENT_LINK_STATE, link_state_hdr),
 762 };
 763
 764 static u32 __iomem *event_hdr_addr(struct switchtec_dev *stdev,
 765                                    int event_id, int index)
 766 {
 767         size_t off;
 768
 769         if (event_id < 0 || event_id >= SWITCHTEC_IOCTL_MAX_EVENTS)
 770                 return ERR_PTR(-EINVAL);
 771
 772         off = event_regs[event_id].offset;
 773
 774         if (event_regs[event_id].map_reg == part_ev_reg) {
 775                 if (index == SWITCHTEC_IOCTL_EVENT_LOCAL_PART_IDX)
 776                         index = stdev->partition;
 777                 else if (index < 0 || index >= stdev->partition_count)
 778                         return ERR_PTR(-EINVAL);
 779         } else if (event_regs[event_id].map_reg == pff_ev_reg) {
 780                 if (index < 0 || index >= stdev->pff_csr_count)
 781                         return ERR_PTR(-EINVAL);
 782         }
 783
 784         return event_regs[event_id].map_reg(stdev, off, index);
 785 }
 786
 787 static int event_ctl(struct switchtec_dev *stdev,
 788                      struct switchtec_ioctl_event_ctl *ctl)
 789 {
 790         int i;
 791         u32 __iomem *reg;
 792         u32 hdr;
 793
 794         reg = event_hdr_addr(stdev, ctl->event_id, ctl->index);
 795         if (IS_ERR(reg))
 796                 return PTR_ERR(reg);
 797
 798         hdr = ioread32(reg);
 799         for (i = 0; i < ARRAY_SIZE(ctl->data); i++)
 800                 ctl->data[i] = ioread32(&reg[i + 1]);
 801
 802         ctl->occurred = hdr & SWITCHTEC_EVENT_OCCURRED;
 803         ctl->count = (hdr >> 5) & 0xFF;
 804
 805         if (!(ctl->flags & SWITCHTEC_IOCTL_EVENT_FLAG_CLEAR))
 806                 hdr &= ~SWITCHTEC_EVENT_CLEAR;
 807         if (ctl->flags & SWITCHTEC_IOCTL_EVENT_FLAG_EN_POLL)
 808                 hdr |= SWITCHTEC_EVENT_EN_IRQ;
 809         if (ctl->flags & SWITCHTEC_IOCTL_EVENT_FLAG_DIS_POLL)
 810                 hdr &= ~SWITCHTEC_EVENT_EN_IRQ;
 811         if (ctl->flags & SWITCHTEC_IOCTL_EVENT_FLAG_EN_LOG)
 812                 hdr |= SWITCHTEC_EVENT_EN_LOG;
 813         if (ctl->flags & SWITCHTEC_IOCTL_EVENT_FLAG_DIS_LOG)
 814                 hdr &= ~SWITCHTEC_EVENT_EN_LOG;
 815         if (ctl->flags & SWITCHTEC_IOCTL_EVENT_FLAG_EN_CLI)
 816                 hdr |= SWITCHTEC_EVENT_EN_CLI;
 817         if (ctl->flags & SWITCHTEC_IOCTL_EVENT_FLAG_DIS_CLI)
 818                 hdr &= ~SWITCHTEC_EVENT_EN_CLI;
 819         if (ctl->flags & SWITCHTEC_IOCTL_EVENT_FLAG_EN_FATAL)
 820                 hdr |= SWITCHTEC_EVENT_FATAL;
 821         if (ctl->flags & SWITCHTEC_IOCTL_EVENT_FLAG_DIS_FATAL)
 822                 hdr &= ~SWITCHTEC_EVENT_FATAL;
 823
 824         if (ctl->flags)
 825                 iowrite32(hdr, reg);
 826
 827         ctl->flags = 0;
 828         if (hdr & SWITCHTEC_EVENT_EN_IRQ)
 829                 ctl->flags |= SWITCHTEC_IOCTL_EVENT_FLAG_EN_POLL;
 830         if (hdr & SWITCHTEC_EVENT_EN_LOG)
 831                 ctl->flags |= SWITCHTEC_IOCTL_EVENT_FLAG_EN_LOG;
 832         if (hdr & SWITCHTEC_EVENT_EN_CLI)
 833                 ctl->flags |= SWITCHTEC_IOCTL_EVENT_FLAG_EN_CLI;
 834         if (hdr & SWITCHTEC_EVENT_FATAL)
 835                 ctl->flags |= SWITCHTEC_IOCTL_EVENT_FLAG_EN_FATAL;
 836
 837         return 0;
 838 }
 839
 840 static int ioctl_event_ctl(struct switchtec_dev *stdev,
 841         struct switchtec_ioctl_event_ctl __user *uctl)
 842 {
 843         int ret;
 844         int nr_idxs;
 845         unsigned int event_flags;
 846         struct switchtec_ioctl_event_ctl ctl;
 847
 848         if (copy_from_user(&ctl, uctl, sizeof(ctl)))
 849                 return -EFAULT;
 850
 851         if (ctl.event_id >= SWITCHTEC_IOCTL_MAX_EVENTS)
 852                 return -EINVAL;
 853
 854         if (ctl.flags & SWITCHTEC_IOCTL_EVENT_FLAG_UNUSED)
 855                 return -EINVAL;
 856
 857         if (ctl.index == SWITCHTEC_IOCTL_EVENT_IDX_ALL) {
 858                 if (event_regs[ctl.event_id].map_reg == global_ev_reg)
 859                         nr_idxs = 1;
 860                 else if (event_regs[ctl.event_id].map_reg == part_ev_reg)
 861                         nr_idxs = stdev->partition_count;
 862                 else if (event_regs[ctl.event_id].map_reg == pff_ev_reg)
 863                         nr_idxs = stdev->pff_csr_count;
 864                 else
 865                         return -EINVAL;
 866
 867                 event_flags = ctl.flags;
 868                 for (ctl.index = 0; ctl.index < nr_idxs; ctl.index++) {
 869                         ctl.flags = event_flags;
 870                         ret = event_ctl(stdev, &ctl);
 871                         if (ret < 0)
 872                                 return ret;
 873                 }
 874         } else {
 875                 ret = event_ctl(stdev, &ctl);
 876                 if (ret < 0)
 877                         return ret;
 878         }
 879
 880         if (copy_to_user(uctl, &ctl, sizeof(ctl)))
 881                 return -EFAULT;
 882
 883         return 0;
 884 }
 885
 886 static int ioctl_pff_to_port(struct switchtec_dev *stdev,
 887                              struct switchtec_ioctl_pff_port *up)
 888 {
 889         int i, part;
 890         u32 reg;
 891         struct part_cfg_regs *pcfg;
 892         struct switchtec_ioctl_pff_port p;
 893
 894         if (copy_from_user(&p, up, sizeof(p)))
 895                 return -EFAULT;
 896
 897         p.port = -1;
 898         for (part = 0; part < stdev->partition_count; part++) {
 899                 pcfg = &stdev->mmio_part_cfg_all[part];
 900                 p.partition = part;
 901
 902                 reg = ioread32(&pcfg->usp_pff_inst_id);
 903                 if (reg == p.pff) {
 904                         p.port = 0;
 905                         break;
 906                 }
 907
 908                 reg = ioread32(&pcfg->vep_pff_inst_id);
 909                 if (reg == p.pff) {
 910                         p.port = SWITCHTEC_IOCTL_PFF_VEP;
 911                         break;
 912                 }
 913
 914                 for (i = 0; i < ARRAY_SIZE(pcfg->dsp_pff_inst_id); i++) {
 915                         reg = ioread32(&pcfg->dsp_pff_inst_id[i]);
 916                         if (reg != p.pff)
 917                                 continue;
 918
 919                         p.port = i + 1;
 920                         break;
 921                 }
 922
 923                 if (p.port != -1)
 924                         break;
 925         }
 926
 927         if (copy_to_user(up, &p, sizeof(p)))
 928                 return -EFAULT;
 929
 930         return 0;
 931 }
 932
 933 static int ioctl_port_to_pff(struct switchtec_dev *stdev,
 934                              struct switchtec_ioctl_pff_port *up)
 935 {
 936         struct switchtec_ioctl_pff_port p;
 937         struct part_cfg_regs *pcfg;
 938
 939         if (copy_from_user(&p, up, sizeof(p)))
 940                 return -EFAULT;
 941
 942         if (p.partition == SWITCHTEC_IOCTL_EVENT_LOCAL_PART_IDX)
 943                 pcfg = stdev->mmio_part_cfg;
 944         else if (p.partition < stdev->partition_count)
 945                 pcfg = &stdev->mmio_part_cfg_all[p.partition];
 946         else
 947                 return -EINVAL;
 948
 949         switch (p.port) {
 950         case 0:
 951                 p.pff = ioread32(&pcfg->usp_pff_inst_id);
 952                 break;
 953         case SWITCHTEC_IOCTL_PFF_VEP:
 954                 p.pff = ioread32(&pcfg->vep_pff_inst_id);
 955                 break;
 956         default:
 957                 if (p.port > ARRAY_SIZE(pcfg->dsp_pff_inst_id))
 958                         return -EINVAL;
 959                 p.port = array_index_nospec(p.port,
 960                                         ARRAY_SIZE(pcfg->dsp_pff_inst_id) + 1);
 961                 p.pff = ioread32(&pcfg->dsp_pff_inst_id[p.port - 1]);
 962                 break;
 963         }
 964
 965         if (copy_to_user(up, &p, sizeof(p)))
 966                 return -EFAULT;
 967
 968         return 0;
 969 }
 970
 971 static long switchtec_dev_ioctl(struct file *filp, unsigned int cmd,
 972                                 unsigned long arg)
 973 {
 974         struct switchtec_user *stuser = filp->private_data;
 975         struct switchtec_dev *stdev = stuser->stdev;
 976         int rc;
 977         void __user *argp = (void __user *)arg;
 978
 979         rc = lock_mutex_and_test_alive(stdev);
 980         if (rc)
 981                 return rc;
 982
 983         switch (cmd) {
 984         case SWITCHTEC_IOCTL_FLASH_INFO:
 985                 rc = ioctl_flash_info(stdev, argp);
 986                 break;
 987         case SWITCHTEC_IOCTL_FLASH_PART_INFO:
 988                 rc = ioctl_flash_part_info(stdev, argp);
 989                 break;
 990         case SWITCHTEC_IOCTL_EVENT_SUMMARY_LEGACY:
 991                 rc = ioctl_event_summary(stdev, stuser, argp,
 992                                          sizeof(struct switchtec_ioctl_event_summary_legacy));
 993                 break;
 994         case SWITCHTEC_IOCTL_EVENT_CTL:
 995                 rc = ioctl_event_ctl(stdev, argp);
 996                 break;
 997         case SWITCHTEC_IOCTL_PFF_TO_PORT:
 998                 rc = ioctl_pff_to_port(stdev, argp);
 999                 break;
1000         case SWITCHTEC_IOCTL_PORT_TO_PFF:
1001                 rc = ioctl_port_to_pff(stdev, argp);
1002                 break;
1003         case SWITCHTEC_IOCTL_EVENT_SUMMARY:
1004                 rc = ioctl_event_summary(stdev, stuser, argp,
1005                                          sizeof(struct switchtec_ioctl_event_summary));
1006                 break;
1007         default:
1008                 rc = -ENOTTY;
1009                 break;
1010         }
1011
1012         mutex_unlock(&stdev->mrpc_mutex);
1013         return rc;
1014 }
1015
1016 static const struct file_operations switchtec_fops = {
1017         .owner = THIS_MODULE,
1018         .open = switchtec_dev_open,
1019         .release = switchtec_dev_release,
1020         .write = switchtec_dev_write,
1021         .read = switchtec_dev_read,
1022         .poll = switchtec_dev_poll,
1023         .unlocked_ioctl = switchtec_dev_ioctl,
1024         .compat_ioctl = switchtec_dev_ioctl,
1025 };
1026
1027 static void link_event_work(struct work_struct *work)
1028 {
1029         struct switchtec_dev *stdev;
1030
1031         stdev = container_of(work, struct switchtec_dev, link_event_work);
1032
1033         if (stdev->link_notifier)
1034                 stdev->link_notifier(stdev);
1035 }
1036
1037 static void check_link_state_events(struct switchtec_dev *stdev)
1038 {
1039         int idx;
1040         u32 reg;
1041         int count;
1042         int occurred = 0;
1043
1044         for (idx = 0; idx < stdev->pff_csr_count; idx++) {
1045                 reg = ioread32(&stdev->mmio_pff_csr[idx].link_state_hdr);
1046                 dev_dbg(&stdev->dev, "link_state: %d->%08x\n", idx, reg);
1047                 count = (reg >> 5) & 0xFF;
1048
1049                 if (count != stdev->link_event_count[idx]) {
1050                         occurred = 1;
1051                         stdev->link_event_count[idx] = count;
1052                 }
1053         }
1054
1055         if (occurred)
1056                 schedule_work(&stdev->link_event_work);
1057 }
1058
1059 static void enable_link_state_events(struct switchtec_dev *stdev)
1060 {
1061         int idx;
1062
1063         for (idx = 0; idx < stdev->pff_csr_count; idx++) {
1064                 iowrite32(SWITCHTEC_EVENT_CLEAR |
1065                           SWITCHTEC_EVENT_EN_IRQ,
1066                           &stdev->mmio_pff_csr[idx].link_state_hdr);
1067         }
1068 }
1069
1070 static void enable_dma_mrpc(struct switchtec_dev *stdev)
1071 {
1072         writeq(stdev->dma_mrpc_dma_addr, &stdev->mmio_mrpc->dma_addr);
1073         flush_wc_buf(stdev);
1074         iowrite32(SWITCHTEC_DMA_MRPC_EN, &stdev->mmio_mrpc->dma_en);
1075 }
1076
1077 static void stdev_release(struct device *dev)
1078 {
1079         struct switchtec_dev *stdev = to_stdev(dev);
1080
1081         if (stdev->dma_mrpc) {
1082                 iowrite32(0, &stdev->mmio_mrpc->dma_en);
1083                 flush_wc_buf(stdev);
1084                 writeq(0, &stdev->mmio_mrpc->dma_addr);
1085                 dma_free_coherent(&stdev->pdev->dev, sizeof(*stdev->dma_mrpc),
1086                                 stdev->dma_mrpc, stdev->dma_mrpc_dma_addr);
1087         }
1088         kfree(stdev);
1089 }
1090
1091 static void stdev_kill(struct switchtec_dev *stdev)
1092 {
1093         struct switchtec_user *stuser, *tmpuser;
1094
1095         pci_clear_master(stdev->pdev);
1096
1097         cancel_delayed_work_sync(&stdev->mrpc_timeout);
1098
1099         /* Mark the hardware as unavailable and complete all completions */
1100         mutex_lock(&stdev->mrpc_mutex);
1101         stdev->alive = false;
1102
1103         /* Wake up and kill any users waiting on an MRPC request */
1104         list_for_each_entry_safe(stuser, tmpuser, &stdev->mrpc_queue, list) {
1105                 complete_all(&stuser->comp);
1106                 list_del_init(&stuser->list);
1107                 stuser_put(stuser);
1108         }
1109
1110         mutex_unlock(&stdev->mrpc_mutex);
1111
1112         /* Wake up any users waiting on event_wq */
1113         wake_up_interruptible(&stdev->event_wq);
1114 }
1115
1116 static struct switchtec_dev *stdev_create(struct pci_dev *pdev)
1117 {
1118         struct switchtec_dev *stdev;
1119         int minor;
1120         struct device *dev;
1121         struct cdev *cdev;
1122         int rc;
1123
1124         stdev = kzalloc_node(sizeof(*stdev), GFP_KERNEL,
1125                              dev_to_node(&pdev->dev));
1126         if (!stdev)
1127                 return ERR_PTR(-ENOMEM);
1128
1129         stdev->alive = true;
1130         stdev->pdev = pdev;
1131         INIT_LIST_HEAD(&stdev->mrpc_queue);
1132         mutex_init(&stdev->mrpc_mutex);
1133         stdev->mrpc_busy = 0;
1134         INIT_WORK(&stdev->mrpc_work, mrpc_event_work);
1135         INIT_DELAYED_WORK(&stdev->mrpc_timeout, mrpc_timeout_work);
1136         INIT_WORK(&stdev->link_event_work, link_event_work);
1137         init_waitqueue_head(&stdev->event_wq);
1138         atomic_set(&stdev->event_cnt, 0);
1139
1140         dev = &stdev->dev;
1141         device_initialize(dev);
1142         dev->class = switchtec_class;
1143         dev->parent = &pdev->dev;
1144         dev->groups = switchtec_device_groups;
1145         dev->release = stdev_release;
1146
1147         minor = ida_simple_get(&switchtec_minor_ida, 0, 0,
1148                                GFP_KERNEL);
1149         if (minor < 0) {
1150                 rc = minor;
1151                 goto err_put;
1152         }
1153
1154         dev->devt = MKDEV(MAJOR(switchtec_devt), minor);
1155         dev_set_name(dev, "switchtec%d", minor);
1156
1157         cdev = &stdev->cdev;
1158         cdev_init(cdev, &switchtec_fops);
1159         cdev->owner = THIS_MODULE;
1160
1161         return stdev;
1162
1163 err_put:
1164         put_device(&stdev->dev);
1165         return ERR_PTR(rc);
1166 }
1167
1168 static int mask_event(struct switchtec_dev *stdev, int eid, int idx)
1169 {
1170         size_t off = event_regs[eid].offset;
1171         u32 __iomem *hdr_reg;
1172         u32 hdr;
1173
1174         hdr_reg = event_regs[eid].map_reg(stdev, off, idx);
1175         hdr = ioread32(hdr_reg);
1176
1177         if (!(hdr & SWITCHTEC_EVENT_OCCURRED && hdr & SWITCHTEC_EVENT_EN_IRQ))
1178                 return 0;
1179
1180         if (eid == SWITCHTEC_IOCTL_EVENT_LINK_STATE ||
1181             eid == SWITCHTEC_IOCTL_EVENT_MRPC_COMP)
1182                 return 0;
1183
1184         dev_dbg(&stdev->dev, "%s: %d %d %x\n", __func__, eid, idx, hdr);
1185         hdr &= ~(SWITCHTEC_EVENT_EN_IRQ | SWITCHTEC_EVENT_OCCURRED);
1186         iowrite32(hdr, hdr_reg);
1187
1188         return 1;
1189 }
1190
1191 static int mask_all_events(struct switchtec_dev *stdev, int eid)
1192 {
1193         int idx;
1194         int count = 0;
1195
1196         if (event_regs[eid].map_reg == part_ev_reg) {
1197                 for (idx = 0; idx < stdev->partition_count; idx++)
1198                         count += mask_event(stdev, eid, idx);
1199         } else if (event_regs[eid].map_reg == pff_ev_reg) {
1200                 for (idx = 0; idx < stdev->pff_csr_count; idx++) {
1201                         if (!stdev->pff_local[idx])
1202                                 continue;
1203
1204                         count += mask_event(stdev, eid, idx);
1205                 }
1206         } else {
1207                 count += mask_event(stdev, eid, 0);
1208         }
1209
1210         return count;
1211 }
1212
1213 static irqreturn_t switchtec_event_isr(int irq, void *dev)
1214 {
1215         struct switchtec_dev *stdev = dev;
1216         u32 reg;
1217         irqreturn_t ret = IRQ_NONE;
1218         int eid, event_count = 0;
1219
1220         reg = ioread32(&stdev->mmio_part_cfg->mrpc_comp_hdr);
1221         if (reg & SWITCHTEC_EVENT_OCCURRED) {
1222                 dev_dbg(&stdev->dev, "%s: mrpc comp\n", __func__);
1223                 ret = IRQ_HANDLED;
1224                 schedule_work(&stdev->mrpc_work);
1225                 iowrite32(reg, &stdev->mmio_part_cfg->mrpc_comp_hdr);
1226         }
1227
1228         check_link_state_events(stdev);
1229
1230         for (eid = 0; eid < SWITCHTEC_IOCTL_MAX_EVENTS; eid++)
1231                 event_count += mask_all_events(stdev, eid);
1232
1233         if (event_count) {
1234                 atomic_inc(&stdev->event_cnt);
1235                 wake_up_interruptible(&stdev->event_wq);
1236                 dev_dbg(&stdev->dev, "%s: %d events\n", __func__,
1237                         event_count);
1238                 return IRQ_HANDLED;
1239         }
1240
1241         return ret;
1242 }
1243
1244
1245 static irqreturn_t switchtec_dma_mrpc_isr(int irq, void *dev)
1246 {
1247         struct switchtec_dev *stdev = dev;
1248         irqreturn_t ret = IRQ_NONE;
1249
1250         iowrite32(SWITCHTEC_EVENT_CLEAR |
1251                   SWITCHTEC_EVENT_EN_IRQ,
1252                   &stdev->mmio_part_cfg->mrpc_comp_hdr);
1253         schedule_work(&stdev->mrpc_work);
1254
1255         ret = IRQ_HANDLED;
1256         return ret;
1257 }
1258
1259 static int switchtec_init_isr(struct switchtec_dev *stdev)
1260 {
1261         int nvecs;
1262         int event_irq;
1263         int dma_mrpc_irq;
1264         int rc;
1265
1266         nvecs = pci_alloc_irq_vectors(stdev->pdev, 1, 4,
1267                                       PCI_IRQ_MSIX | PCI_IRQ_MSI);
1268         if (nvecs < 0)
1269                 return nvecs;
1270
1271         event_irq = ioread32(&stdev->mmio_part_cfg->vep_vector_number);
1272         if (event_irq < 0 || event_irq >= nvecs)
1273                 return -EFAULT;
1274
1275         event_irq = pci_irq_vector(stdev->pdev, event_irq);
1276         if (event_irq < 0)
1277                 return event_irq;
1278
1279         rc = devm_request_irq(&stdev->pdev->dev, event_irq,
1280                                 switchtec_event_isr, 0,
1281                                 KBUILD_MODNAME, stdev);
1282
1283         if (rc)
1284                 return rc;
1285
1286         if (!stdev->dma_mrpc)
1287                 return rc;
1288
1289         dma_mrpc_irq = ioread32(&stdev->mmio_mrpc->dma_vector);
1290         if (dma_mrpc_irq < 0 || dma_mrpc_irq >= nvecs)
1291                 return -EFAULT;
1292
1293         dma_mrpc_irq  = pci_irq_vector(stdev->pdev, dma_mrpc_irq);
1294         if (dma_mrpc_irq < 0)
1295                 return dma_mrpc_irq;
1296
1297         rc = devm_request_irq(&stdev->pdev->dev, dma_mrpc_irq,
1298                                 switchtec_dma_mrpc_isr, 0,
1299                                 KBUILD_MODNAME, stdev);
1300
1301         return rc;
1302 }
1303
1304 static void init_pff(struct switchtec_dev *stdev)
1305 {
1306         int i;
1307         u32 reg;
1308         struct part_cfg_regs *pcfg = stdev->mmio_part_cfg;
1309
1310         for (i = 0; i < SWITCHTEC_MAX_PFF_CSR; i++) {
1311                 reg = ioread16(&stdev->mmio_pff_csr[i].vendor_id);
1312                 if (reg != PCI_VENDOR_ID_MICROSEMI)
1313                         break;
1314         }
1315
1316         stdev->pff_csr_count = i;
1317
1318         reg = ioread32(&pcfg->usp_pff_inst_id);
1319         if (reg < SWITCHTEC_MAX_PFF_CSR)
1320                 stdev->pff_local[reg] = 1;
1321
1322         reg = ioread32(&pcfg->vep_pff_inst_id);
1323         if (reg < SWITCHTEC_MAX_PFF_CSR)
1324                 stdev->pff_local[reg] = 1;
1325
1326         for (i = 0; i < ARRAY_SIZE(pcfg->dsp_pff_inst_id); i++) {
1327                 reg = ioread32(&pcfg->dsp_pff_inst_id[i]);
1328                 if (reg < SWITCHTEC_MAX_PFF_CSR)
1329                         stdev->pff_local[reg] = 1;
1330         }
1331 }
1332
1333 static int switchtec_init_pci(struct switchtec_dev *stdev,
1334                               struct pci_dev *pdev)
1335 {
1336         int rc;
1337         void __iomem *map;
1338         unsigned long res_start, res_len;
1339
1340         rc = pcim_enable_device(pdev);
1341         if (rc)
1342                 return rc;
1343
1344         rc = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
1345         if (rc)
1346                 return rc;
1347
1348         pci_set_master(pdev);
1349
1350         res_start = pci_resource_start(pdev, 0);
1351         res_len = pci_resource_len(pdev, 0);
1352
1353         if (!devm_request_mem_region(&pdev->dev, res_start,
1354                                      res_len, KBUILD_MODNAME))
1355                 return -EBUSY;
1356
1357         stdev->mmio_mrpc = devm_ioremap_wc(&pdev->dev, res_start,
1358                                            SWITCHTEC_GAS_TOP_CFG_OFFSET);
1359         if (!stdev->mmio_mrpc)
1360                 return -ENOMEM;
1361
1362         map = devm_ioremap(&pdev->dev,
1363                            res_start + SWITCHTEC_GAS_TOP_CFG_OFFSET,
1364                            res_len - SWITCHTEC_GAS_TOP_CFG_OFFSET);
1365         if (!map)
1366                 return -ENOMEM;
1367
1368         stdev->mmio = map - SWITCHTEC_GAS_TOP_CFG_OFFSET;
1369         stdev->mmio_sw_event = stdev->mmio + SWITCHTEC_GAS_SW_EVENT_OFFSET;
1370         stdev->mmio_sys_info = stdev->mmio + SWITCHTEC_GAS_SYS_INFO_OFFSET;
1371         stdev->mmio_flash_info = stdev->mmio + SWITCHTEC_GAS_FLASH_INFO_OFFSET;
1372         stdev->mmio_ntb = stdev->mmio + SWITCHTEC_GAS_NTB_OFFSET;
1373         stdev->partition = ioread8(&stdev->mmio_sys_info->partition_id);
1374         stdev->partition_count = ioread8(&stdev->mmio_ntb->partition_count);
1375         stdev->mmio_part_cfg_all = stdev->mmio + SWITCHTEC_GAS_PART_CFG_OFFSET;
1376         stdev->mmio_part_cfg = &stdev->mmio_part_cfg_all[stdev->partition];
1377         stdev->mmio_pff_csr = stdev->mmio + SWITCHTEC_GAS_PFF_CSR_OFFSET;
1378
1379         if (stdev->partition_count < 1)
1380                 stdev->partition_count = 1;
1381
1382         init_pff(stdev);
1383
1384         pci_set_drvdata(pdev, stdev);
1385
1386         if (!use_dma_mrpc)
1387                 return 0;
1388
1389         if (ioread32(&stdev->mmio_mrpc->dma_ver) == 0)
1390                 return 0;
1391
1392         stdev->dma_mrpc = dma_alloc_coherent(&stdev->pdev->dev,
1393                                              sizeof(*stdev->dma_mrpc),
1394                                              &stdev->dma_mrpc_dma_addr,
1395                                              GFP_KERNEL);
1396         if (stdev->dma_mrpc == NULL)
1397                 return -ENOMEM;
1398
1399         return 0;
1400 }
1401
1402 static int switchtec_pci_probe(struct pci_dev *pdev,
1403                                const struct pci_device_id *id)
1404 {
1405         struct switchtec_dev *stdev;
1406         int rc;
1407
1408         if (pdev->class == (PCI_CLASS_BRIDGE_OTHER << 8))
1409                 request_module_nowait("ntb_hw_switchtec");
1410
1411         stdev = stdev_create(pdev);
1412         if (IS_ERR(stdev))
1413                 return PTR_ERR(stdev);
1414
1415         rc = switchtec_init_pci(stdev, pdev);
1416         if (rc)
1417                 goto err_put;
1418
1419         rc = switchtec_init_isr(stdev);
1420         if (rc) {
1421                 dev_err(&stdev->dev, "failed to init isr.\n");
1422                 goto err_put;
1423         }
1424
1425         iowrite32(SWITCHTEC_EVENT_CLEAR |
1426                   SWITCHTEC_EVENT_EN_IRQ,
1427                   &stdev->mmio_part_cfg->mrpc_comp_hdr);
1428         enable_link_state_events(stdev);
1429
1430         if (stdev->dma_mrpc)
1431                 enable_dma_mrpc(stdev);
1432
1433         rc = cdev_device_add(&stdev->cdev, &stdev->dev);
1434         if (rc)
1435                 goto err_devadd;
1436
1437         dev_info(&stdev->dev, "Management device registered.\n");
1438
1439         return 0;
1440
1441 err_devadd:
1442         stdev_kill(stdev);
1443 err_put:
1444         ida_simple_remove(&switchtec_minor_ida, MINOR(stdev->dev.devt));
1445         put_device(&stdev->dev);
1446         return rc;
1447 }
1448
1449 static void switchtec_pci_remove(struct pci_dev *pdev)
1450 {
1451         struct switchtec_dev *stdev = pci_get_drvdata(pdev);
1452
1453         pci_set_drvdata(pdev, NULL);
1454
1455         cdev_device_del(&stdev->cdev, &stdev->dev);
1456         ida_simple_remove(&switchtec_minor_ida, MINOR(stdev->dev.devt));
1457         dev_info(&stdev->dev, "unregistered.\n");
1458         stdev_kill(stdev);
1459         put_device(&stdev->dev);
1460 }
1461
1462 #define SWITCHTEC_PCI_DEVICE(device_id) \
1463         { \
1464                 .vendor     = PCI_VENDOR_ID_MICROSEMI, \
1465                 .device     = device_id, \
1466                 .subvendor  = PCI_ANY_ID, \
1467                 .subdevice  = PCI_ANY_ID, \
1468                 .class      = (PCI_CLASS_MEMORY_OTHER << 8), \
1469                 .class_mask = 0xFFFFFFFF, \
1470         }, \
1471         { \
1472                 .vendor     = PCI_VENDOR_ID_MICROSEMI, \
1473                 .device     = device_id, \
1474                 .subvendor  = PCI_ANY_ID, \
1475                 .subdevice  = PCI_ANY_ID, \
1476                 .class      = (PCI_CLASS_BRIDGE_OTHER << 8), \
1477                 .class_mask = 0xFFFFFFFF, \
1478         }
1479
1480 static const struct pci_device_id switchtec_pci_tbl[] = {
1481         SWITCHTEC_PCI_DEVICE(0x8531),  //PFX 24xG3
1482         SWITCHTEC_PCI_DEVICE(0x8532),  //PFX 32xG3
1483         SWITCHTEC_PCI_DEVICE(0x8533),  //PFX 48xG3
1484         SWITCHTEC_PCI_DEVICE(0x8534),  //PFX 64xG3
1485         SWITCHTEC_PCI_DEVICE(0x8535),  //PFX 80xG3
1486         SWITCHTEC_PCI_DEVICE(0x8536),  //PFX 96xG3
1487         SWITCHTEC_PCI_DEVICE(0x8541),  //PSX 24xG3
1488         SWITCHTEC_PCI_DEVICE(0x8542),  //PSX 32xG3
1489         SWITCHTEC_PCI_DEVICE(0x8543),  //PSX 48xG3
1490         SWITCHTEC_PCI_DEVICE(0x8544),  //PSX 64xG3
1491         SWITCHTEC_PCI_DEVICE(0x8545),  //PSX 80xG3
1492         SWITCHTEC_PCI_DEVICE(0x8546),  //PSX 96xG3
1493         SWITCHTEC_PCI_DEVICE(0x8551),  //PAX 24XG3
1494         SWITCHTEC_PCI_DEVICE(0x8552),  //PAX 32XG3
1495         SWITCHTEC_PCI_DEVICE(0x8553),  //PAX 48XG3
1496         SWITCHTEC_PCI_DEVICE(0x8554),  //PAX 64XG3
1497         SWITCHTEC_PCI_DEVICE(0x8555),  //PAX 80XG3
1498         SWITCHTEC_PCI_DEVICE(0x8556),  //PAX 96XG3
1499         SWITCHTEC_PCI_DEVICE(0x8561),  //PFXL 24XG3
1500         SWITCHTEC_PCI_DEVICE(0x8562),  //PFXL 32XG3
1501         SWITCHTEC_PCI_DEVICE(0x8563),  //PFXL 48XG3
1502         SWITCHTEC_PCI_DEVICE(0x8564),  //PFXL 64XG3
1503         SWITCHTEC_PCI_DEVICE(0x8565),  //PFXL 80XG3
1504         SWITCHTEC_PCI_DEVICE(0x8566),  //PFXL 96XG3
1505         SWITCHTEC_PCI_DEVICE(0x8571),  //PFXI 24XG3
1506         SWITCHTEC_PCI_DEVICE(0x8572),  //PFXI 32XG3
1507         SWITCHTEC_PCI_DEVICE(0x8573),  //PFXI 48XG3
1508         SWITCHTEC_PCI_DEVICE(0x8574),  //PFXI 64XG3
1509         SWITCHTEC_PCI_DEVICE(0x8575),  //PFXI 80XG3
1510         SWITCHTEC_PCI_DEVICE(0x8576),  //PFXI 96XG3
1511         {0}
1512 };
1513 MODULE_DEVICE_TABLE(pci, switchtec_pci_tbl);
1514
1515 static struct pci_driver switchtec_pci_driver = {
1516         .name           = KBUILD_MODNAME,
1517         .id_table       = switchtec_pci_tbl,
1518         .probe          = switchtec_pci_probe,
1519         .remove         = switchtec_pci_remove,
1520 };
1521
1522 static int __init switchtec_init(void)
1523 {
1524         int rc;
1525
1526         rc = alloc_chrdev_region(&switchtec_devt, 0, max_devices,
1527                                  "switchtec");
1528         if (rc)
1529                 return rc;
1530
1531         switchtec_class = class_create(THIS_MODULE, "switchtec");
1532         if (IS_ERR(switchtec_class)) {
1533                 rc = PTR_ERR(switchtec_class);
1534                 goto err_create_class;
1535         }
1536
1537         rc = pci_register_driver(&switchtec_pci_driver);
1538         if (rc)
1539                 goto err_pci_register;
1540
1541         pr_info(KBUILD_MODNAME ": loaded.\n");
1542
1543         return 0;
1544
1545 err_pci_register:
1546         class_destroy(switchtec_class);
1547
1548 err_create_class:
1549         unregister_chrdev_region(switchtec_devt, max_devices);
1550
1551         return rc;
1552 }
1553 module_init(switchtec_init);
1554
1555 static void __exit switchtec_exit(void)
1556 {
1557         pci_unregister_driver(&switchtec_pci_driver);
1558         class_destroy(switchtec_class);
1559         unregister_chrdev_region(switchtec_devt, max_devices);
1560         ida_destroy(&switchtec_minor_ida);
1561
1562         pr_info(KBUILD_MODNAME ": unloaded.\n");
1563 }
1564 module_exit(switchtec_exit);