drivers/pci/hotplug/pciehp_hpc.c

   1 /*
   2  * PCI Express PCI Hot Plug Driver
   3  *
   4  * Copyright (C) 1995,2001 Compaq Computer Corporation
   5  * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
   6  * Copyright (C) 2001 IBM Corp.
   7  * Copyright (C) 2003-2004 Intel Corporation
   8  *
   9  * All rights reserved.
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or (at
  14  * your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful, but
  17  * WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  19  * NON INFRINGEMENT.  See the GNU General Public License for more
  20  * details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  25  *
  26  * Send feedback to <greg@kroah.com>,<kristen.c.accardi@intel.com>
  27  *
  28  */
  29
  30 #include <linux/kernel.h>
  31 #include <linux/module.h>
  32 #include <linux/types.h>
  33 #include <linux/signal.h>
  34 #include <linux/jiffies.h>
  35 #include <linux/timer.h>
  36 #include <linux/pci.h>
  37 #include <linux/interrupt.h>
  38 #include <linux/time.h>
  39 #include <linux/slab.h>
  40
  41 #include "../pci.h"
  42 #include "pciehp.h"
  43
  44 static inline int pciehp_readw(struct controller *ctrl, int reg, u16 *value)
  45 {
  46         struct pci_dev *dev = ctrl->pcie->port;
  47         return pci_read_config_word(dev, pci_pcie_cap(dev) + reg, value);
  48 }
  49
  50 static inline int pciehp_readl(struct controller *ctrl, int reg, u32 *value)
  51 {
  52         struct pci_dev *dev = ctrl->pcie->port;
  53         return pci_read_config_dword(dev, pci_pcie_cap(dev) + reg, value);
  54 }
  55
  56 static inline int pciehp_writew(struct controller *ctrl, int reg, u16 value)
  57 {
  58         struct pci_dev *dev = ctrl->pcie->port;
  59         return pci_write_config_word(dev, pci_pcie_cap(dev) + reg, value);
  60 }
  61
  62 static inline int pciehp_writel(struct controller *ctrl, int reg, u32 value)
  63 {
  64         struct pci_dev *dev = ctrl->pcie->port;
  65         return pci_write_config_dword(dev, pci_pcie_cap(dev) + reg, value);
  66 }
  67
  68 /* Power Control Command */
  69 #define POWER_ON        0
  70 #define POWER_OFF       PCI_EXP_SLTCTL_PCC
  71
  72 static irqreturn_t pcie_isr(int irq, void *dev_id);
  73 static void start_int_poll_timer(struct controller *ctrl, int sec);
  74
  75 /* This is the interrupt polling timeout function. */
  76 static void int_poll_timeout(unsigned long data)
  77 {
  78         struct controller *ctrl = (struct controller *)data;
  79
  80         /* Poll for interrupt events.  regs == NULL => polling */
  81         pcie_isr(0, ctrl);
  82
  83         init_timer(&ctrl->poll_timer);
  84         if (!pciehp_poll_time)
  85                 pciehp_poll_time = 2; /* default polling interval is 2 sec */
  86
  87         start_int_poll_timer(ctrl, pciehp_poll_time);
  88 }
  89
  90 /* This function starts the interrupt polling timer. */
  91 static void start_int_poll_timer(struct controller *ctrl, int sec)
  92 {
  93         /* Clamp to sane value */
  94         if ((sec <= 0) || (sec > 60))
  95                 sec = 2;
  96
  97         ctrl->poll_timer.function = &int_poll_timeout;
  98         ctrl->poll_timer.data = (unsigned long)ctrl;
  99         ctrl->poll_timer.expires = jiffies + sec * HZ;
 100         add_timer(&ctrl->poll_timer);
 101 }
 102
 103 static inline int pciehp_request_irq(struct controller *ctrl)
 104 {
 105         int retval, irq = ctrl->pcie->irq;
 106
 107         /* Install interrupt polling timer. Start with 10 sec delay */
 108         if (pciehp_poll_mode) {
 109                 init_timer(&ctrl->poll_timer);
 110                 start_int_poll_timer(ctrl, 10);
 111                 return 0;
 112         }
 113
 114         /* Installs the interrupt handler */
 115         retval = request_irq(irq, pcie_isr, IRQF_SHARED, MY_NAME, ctrl);
 116         if (retval)
 117                 ctrl_err(ctrl, "Cannot get irq %d for the hotplug controller\n",
 118                          irq);
 119         return retval;
 120 }
 121
 122 static inline void pciehp_free_irq(struct controller *ctrl)
 123 {
 124         if (pciehp_poll_mode)
 125                 del_timer_sync(&ctrl->poll_timer);
 126         else
 127                 free_irq(ctrl->pcie->irq, ctrl);
 128 }
 129
 130 static int pcie_poll_cmd(struct controller *ctrl)
 131 {
 132         u16 slot_status;
 133         int err, timeout = 1000;
 134
 135         err = pciehp_readw(ctrl, PCI_EXP_SLTSTA, &slot_status);
 136         if (!err && (slot_status & PCI_EXP_SLTSTA_CC)) {
 137                 pciehp_writew(ctrl, PCI_EXP_SLTSTA, PCI_EXP_SLTSTA_CC);
 138                 return 1;
 139         }
 140         while (timeout > 0) {
 141                 msleep(10);
 142                 timeout -= 10;
 143                 err = pciehp_readw(ctrl, PCI_EXP_SLTSTA, &slot_status);
 144                 if (!err && (slot_status & PCI_EXP_SLTSTA_CC)) {
 145                         pciehp_writew(ctrl, PCI_EXP_SLTSTA, PCI_EXP_SLTSTA_CC);
 146                         return 1;
 147                 }
 148         }
 149         return 0;       /* timeout */
 150 }
 151
 152 static void pcie_wait_cmd(struct controller *ctrl, int poll)
 153 {
 154         unsigned int msecs = pciehp_poll_mode ? 2500 : 1000;
 155         unsigned long timeout = msecs_to_jiffies(msecs);
 156         int rc;
 157
 158         if (poll)
 159                 rc = pcie_poll_cmd(ctrl);
 160         else
 161                 rc = wait_event_timeout(ctrl->queue, !ctrl->cmd_busy, timeout);
 162         if (!rc)
 163                 ctrl_dbg(ctrl, "Command not completed in 1000 msec\n");
 164 }
 165
 166 /**
 167  * pcie_write_cmd - Issue controller command
 168  * @ctrl: controller to which the command is issued
 169  * @cmd:  command value written to slot control register
 170  * @mask: bitmask of slot control register to be modified
 171  */
 172 static int pcie_write_cmd(struct controller *ctrl, u16 cmd, u16 mask)
 173 {
 174         int retval = 0;
 175         u16 slot_status;
 176         u16 slot_ctrl;
 177
 178         mutex_lock(&ctrl->ctrl_lock);
 179
 180         retval = pciehp_readw(ctrl, PCI_EXP_SLTSTA, &slot_status);
 181         if (retval) {
 182                 ctrl_err(ctrl, "%s: Cannot read SLOTSTATUS register\n",
 183                          __func__);
 184                 goto out;
 185         }
 186
 187         if (slot_status & PCI_EXP_SLTSTA_CC) {
 188                 if (!ctrl->no_cmd_complete) {
 189                         /*
 190                          * After 1 sec and CMD_COMPLETED still not set, just
 191                          * proceed forward to issue the next command according
 192                          * to spec. Just print out the error message.
 193                          */
 194                         ctrl_dbg(ctrl, "CMD_COMPLETED not clear after 1 sec\n");
 195                 } else if (!NO_CMD_CMPL(ctrl)) {
 196                         /*
 197                          * This controller semms to notify of command completed
 198                          * event even though it supports none of power
 199                          * controller, attention led, power led and EMI.
 200                          */
 201                         ctrl_dbg(ctrl, "Unexpected CMD_COMPLETED. Need to "
 202                                  "wait for command completed event.\n");
 203                         ctrl->no_cmd_complete = 0;
 204                 } else {
 205                         ctrl_dbg(ctrl, "Unexpected CMD_COMPLETED. Maybe "
 206                                  "the controller is broken.\n");
 207                 }
 208         }
 209
 210         retval = pciehp_readw(ctrl, PCI_EXP_SLTCTL, &slot_ctrl);
 211         if (retval) {
 212                 ctrl_err(ctrl, "%s: Cannot read SLOTCTRL register\n", __func__);
 213                 goto out;
 214         }
 215
 216         slot_ctrl &= ~mask;
 217         slot_ctrl |= (cmd & mask);
 218         ctrl->cmd_busy = 1;
 219         smp_mb();
 220         retval = pciehp_writew(ctrl, PCI_EXP_SLTCTL, slot_ctrl);
 221         if (retval)
 222                 ctrl_err(ctrl, "Cannot write to SLOTCTRL register\n");
 223
 224         /*
 225          * Wait for command completion.
 226          */
 227         if (!retval && !ctrl->no_cmd_complete) {
 228                 int poll = 0;
 229                 /*
 230                  * if hotplug interrupt is not enabled or command
 231                  * completed interrupt is not enabled, we need to poll
 232                  * command completed event.
 233                  */
 234                 if (!(slot_ctrl & PCI_EXP_SLTCTL_HPIE) ||
 235                     !(slot_ctrl & PCI_EXP_SLTCTL_CCIE))
 236                         poll = 1;
 237                 pcie_wait_cmd(ctrl, poll);
 238         }
 239  out:
 240         mutex_unlock(&ctrl->ctrl_lock);
 241         return retval;
 242 }
 243
 244 static inline int check_link_active(struct controller *ctrl)
 245 {
 246         u16 link_status;
 247
 248         if (pciehp_readw(ctrl, PCI_EXP_LNKSTA, &link_status))
 249                 return 0;
 250         return !!(link_status & PCI_EXP_LNKSTA_DLLLA);
 251 }
 252
 253 static void pcie_wait_link_active(struct controller *ctrl)
 254 {
 255         int timeout = 1000;
 256
 257         if (check_link_active(ctrl))
 258                 return;
 259         while (timeout > 0) {
 260                 msleep(10);
 261                 timeout -= 10;
 262                 if (check_link_active(ctrl))
 263                         return;
 264         }
 265         ctrl_dbg(ctrl, "Data Link Layer Link Active not set in 1000 msec\n");
 266 }
 267
 268 int pciehp_check_link_status(struct controller *ctrl)
 269 {
 270         u16 lnk_status;
 271         int retval = 0;
 272
 273         /*
 274          * Data Link Layer Link Active Reporting must be capable for
 275          * hot-plug capable downstream port. But old controller might
 276          * not implement it. In this case, we wait for 1000 ms.
 277          */
 278         if (ctrl->link_active_reporting)
 279                 pcie_wait_link_active(ctrl);
 280         else
 281                 msleep(1000);
 282
 283         /*
 284          * Need to wait for 1000 ms after Data Link Layer Link Active
 285          * (DLLLA) bit reads 1b before sending configuration request.
 286          * We need it before checking Link Training (LT) bit becuase
 287          * LT is still set even after DLLLA bit is set on some platform.
 288          */
 289         msleep(1000);
 290
 291         retval = pciehp_readw(ctrl, PCI_EXP_LNKSTA, &lnk_status);
 292         if (retval) {
 293                 ctrl_err(ctrl, "Cannot read LNKSTATUS register\n");
 294                 return retval;
 295         }
 296
 297         ctrl_dbg(ctrl, "%s: lnk_status = %x\n", __func__, lnk_status);
 298         if ((lnk_status & PCI_EXP_LNKSTA_LT) ||
 299             !(lnk_status & PCI_EXP_LNKSTA_NLW)) {
 300                 ctrl_err(ctrl, "Link Training Error occurs \n");
 301                 retval = -1;
 302                 return retval;
 303         }
 304
 305         /*
 306          * If the port supports Link speeds greater than 5.0 GT/s, we
 307          * must wait for 100 ms after Link training completes before
 308          * sending configuration request.
 309          */
 310         if (ctrl->pcie->port->subordinate->max_bus_speed > PCIE_SPEED_5_0GT)
 311                 msleep(100);
 312
 313         pcie_update_link_speed(ctrl->pcie->port->subordinate, lnk_status);
 314
 315         return retval;
 316 }
 317
 318 int pciehp_get_attention_status(struct slot *slot, u8 *status)
 319 {
 320         struct controller *ctrl = slot->ctrl;
 321         u16 slot_ctrl;
 322         u8 atten_led_state;
 323         int retval = 0;
 324
 325         retval = pciehp_readw(ctrl, PCI_EXP_SLTCTL, &slot_ctrl);
 326         if (retval) {
 327                 ctrl_err(ctrl, "%s: Cannot read SLOTCTRL register\n", __func__);
 328                 return retval;
 329         }
 330
 331         ctrl_dbg(ctrl, "%s: SLOTCTRL %x, value read %x\n", __func__,
 332                  pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, slot_ctrl);
 333
 334         atten_led_state = (slot_ctrl & PCI_EXP_SLTCTL_AIC) >> 6;
 335
 336         switch (atten_led_state) {
 337         case 0:
 338                 *status = 0xFF; /* Reserved */
 339                 break;
 340         case 1:
 341                 *status = 1;    /* On */
 342                 break;
 343         case 2:
 344                 *status = 2;    /* Blink */
 345                 break;
 346         case 3:
 347                 *status = 0;    /* Off */
 348                 break;
 349         default:
 350                 *status = 0xFF;
 351                 break;
 352         }
 353
 354         return 0;
 355 }
 356
 357 int pciehp_get_power_status(struct slot *slot, u8 *status)
 358 {
 359         struct controller *ctrl = slot->ctrl;
 360         u16 slot_ctrl;
 361         u8 pwr_state;
 362         int     retval = 0;
 363
 364         retval = pciehp_readw(ctrl, PCI_EXP_SLTCTL, &slot_ctrl);
 365         if (retval) {
 366                 ctrl_err(ctrl, "%s: Cannot read SLOTCTRL register\n", __func__);
 367                 return retval;
 368         }
 369         ctrl_dbg(ctrl, "%s: SLOTCTRL %x value read %x\n", __func__,
 370                  pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, slot_ctrl);
 371
 372         pwr_state = (slot_ctrl & PCI_EXP_SLTCTL_PCC) >> 10;
 373
 374         switch (pwr_state) {
 375         case 0:
 376                 *status = 1;
 377                 break;
 378         case 1:
 379                 *status = 0;
 380                 break;
 381         default:
 382                 *status = 0xFF;
 383                 break;
 384         }
 385
 386         return retval;
 387 }
 388
 389 int pciehp_get_latch_status(struct slot *slot, u8 *status)
 390 {
 391         struct controller *ctrl = slot->ctrl;
 392         u16 slot_status;
 393         int retval;
 394
 395         retval = pciehp_readw(ctrl, PCI_EXP_SLTSTA, &slot_status);
 396         if (retval) {
 397                 ctrl_err(ctrl, "%s: Cannot read SLOTSTATUS register\n",
 398                          __func__);
 399                 return retval;
 400         }
 401         *status = !!(slot_status & PCI_EXP_SLTSTA_MRLSS);
 402         return 0;
 403 }
 404
 405 int pciehp_get_adapter_status(struct slot *slot, u8 *status)
 406 {
 407         struct controller *ctrl = slot->ctrl;
 408         u16 slot_status;
 409         int retval;
 410
 411         retval = pciehp_readw(ctrl, PCI_EXP_SLTSTA, &slot_status);
 412         if (retval) {
 413                 ctrl_err(ctrl, "%s: Cannot read SLOTSTATUS register\n",
 414                          __func__);
 415                 return retval;
 416         }
 417         *status = !!(slot_status & PCI_EXP_SLTSTA_PDS);
 418         return 0;
 419 }
 420
 421 int pciehp_query_power_fault(struct slot *slot)
 422 {
 423         struct controller *ctrl = slot->ctrl;
 424         u16 slot_status;
 425         int retval;
 426
 427         retval = pciehp_readw(ctrl, PCI_EXP_SLTSTA, &slot_status);
 428         if (retval) {
 429                 ctrl_err(ctrl, "Cannot check for power fault\n");
 430                 return retval;
 431         }
 432         return !!(slot_status & PCI_EXP_SLTSTA_PFD);
 433 }
 434
 435 int pciehp_set_attention_status(struct slot *slot, u8 value)
 436 {
 437         struct controller *ctrl = slot->ctrl;
 438         u16 slot_cmd;
 439         u16 cmd_mask;
 440
 441         cmd_mask = PCI_EXP_SLTCTL_AIC;
 442         switch (value) {
 443         case 0 :        /* turn off */
 444                 slot_cmd = 0x00C0;
 445                 break;
 446         case 1:         /* turn on */
 447                 slot_cmd = 0x0040;
 448                 break;
 449         case 2:         /* turn blink */
 450                 slot_cmd = 0x0080;
 451                 break;
 452         default:
 453                 return -EINVAL;
 454         }
 455         ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__,
 456                  pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, slot_cmd);
 457         return pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
 458 }
 459
 460 void pciehp_green_led_on(struct slot *slot)
 461 {
 462         struct controller *ctrl = slot->ctrl;
 463         u16 slot_cmd;
 464         u16 cmd_mask;
 465
 466         slot_cmd = 0x0100;
 467         cmd_mask = PCI_EXP_SLTCTL_PIC;
 468         pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
 469         ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__,
 470                  pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, slot_cmd);
 471 }
 472
 473 void pciehp_green_led_off(struct slot *slot)
 474 {
 475         struct controller *ctrl = slot->ctrl;
 476         u16 slot_cmd;
 477         u16 cmd_mask;
 478
 479         slot_cmd = 0x0300;
 480         cmd_mask = PCI_EXP_SLTCTL_PIC;
 481         pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
 482         ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__,
 483                  pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, slot_cmd);
 484 }
 485
 486 void pciehp_green_led_blink(struct slot *slot)
 487 {
 488         struct controller *ctrl = slot->ctrl;
 489         u16 slot_cmd;
 490         u16 cmd_mask;
 491
 492         slot_cmd = 0x0200;
 493         cmd_mask = PCI_EXP_SLTCTL_PIC;
 494         pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
 495         ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__,
 496                  pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, slot_cmd);
 497 }
 498
 499 int pciehp_power_on_slot(struct slot * slot)
 500 {
 501         struct controller *ctrl = slot->ctrl;
 502         u16 slot_cmd;
 503         u16 cmd_mask;
 504         u16 slot_status;
 505         int retval = 0;
 506
 507         /* Clear sticky power-fault bit from previous power failures */
 508         retval = pciehp_readw(ctrl, PCI_EXP_SLTSTA, &slot_status);
 509         if (retval) {
 510                 ctrl_err(ctrl, "%s: Cannot read SLOTSTATUS register\n",
 511                          __func__);
 512                 return retval;
 513         }
 514         slot_status &= PCI_EXP_SLTSTA_PFD;
 515         if (slot_status) {
 516                 retval = pciehp_writew(ctrl, PCI_EXP_SLTSTA, slot_status);
 517                 if (retval) {
 518                         ctrl_err(ctrl,
 519                                  "%s: Cannot write to SLOTSTATUS register\n",
 520                                  __func__);
 521                         return retval;
 522                 }
 523         }
 524         ctrl->power_fault_detected = 0;
 525
 526         slot_cmd = POWER_ON;
 527         cmd_mask = PCI_EXP_SLTCTL_PCC;
 528         retval = pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
 529         if (retval) {
 530                 ctrl_err(ctrl, "Write %x command failed!\n", slot_cmd);
 531                 return retval;
 532         }
 533         ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__,
 534                  pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, slot_cmd);
 535
 536         return retval;
 537 }
 538
 539 int pciehp_power_off_slot(struct slot * slot)
 540 {
 541         struct controller *ctrl = slot->ctrl;
 542         u16 slot_cmd;
 543         u16 cmd_mask;
 544         int retval;
 545
 546         slot_cmd = POWER_OFF;
 547         cmd_mask = PCI_EXP_SLTCTL_PCC;
 548         retval = pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
 549         if (retval) {
 550                 ctrl_err(ctrl, "Write command failed!\n");
 551                 return retval;
 552         }
 553         ctrl_dbg(ctrl, "%s: SLOTCTRL %x write cmd %x\n", __func__,
 554                  pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, slot_cmd);
 555         return 0;
 556 }
 557
 558 static irqreturn_t pcie_isr(int irq, void *dev_id)
 559 {
 560         struct controller *ctrl = (struct controller *)dev_id;
 561         struct slot *slot = ctrl->slot;
 562         u16 detected, intr_loc;
 563
 564         /*
 565          * In order to guarantee that all interrupt events are
 566          * serviced, we need to re-inspect Slot Status register after
 567          * clearing what is presumed to be the last pending interrupt.
 568          */
 569         intr_loc = 0;
 570         do {
 571                 if (pciehp_readw(ctrl, PCI_EXP_SLTSTA, &detected)) {
 572                         ctrl_err(ctrl, "%s: Cannot read SLOTSTATUS\n",
 573                                  __func__);
 574                         return IRQ_NONE;
 575                 }
 576
 577                 detected &= (PCI_EXP_SLTSTA_ABP | PCI_EXP_SLTSTA_PFD |
 578                              PCI_EXP_SLTSTA_MRLSC | PCI_EXP_SLTSTA_PDC |
 579                              PCI_EXP_SLTSTA_CC);
 580                 detected &= ~intr_loc;
 581                 intr_loc |= detected;
 582                 if (!intr_loc)
 583                         return IRQ_NONE;
 584                 if (detected && pciehp_writew(ctrl, PCI_EXP_SLTSTA, intr_loc)) {
 585                         ctrl_err(ctrl, "%s: Cannot write to SLOTSTATUS\n",
 586                                  __func__);
 587                         return IRQ_NONE;
 588                 }
 589         } while (detected);
 590
 591         ctrl_dbg(ctrl, "%s: intr_loc %x\n", __func__, intr_loc);
 592
 593         /* Check Command Complete Interrupt Pending */
 594         if (intr_loc & PCI_EXP_SLTSTA_CC) {
 595                 ctrl->cmd_busy = 0;
 596                 smp_mb();
 597                 wake_up(&ctrl->queue);
 598         }
 599
 600         if (!(intr_loc & ~PCI_EXP_SLTSTA_CC))
 601                 return IRQ_HANDLED;
 602
 603         /* Check MRL Sensor Changed */
 604         if (intr_loc & PCI_EXP_SLTSTA_MRLSC)
 605                 pciehp_handle_switch_change(slot);
 606
 607         /* Check Attention Button Pressed */
 608         if (intr_loc & PCI_EXP_SLTSTA_ABP)
 609                 pciehp_handle_attention_button(slot);
 610
 611         /* Check Presence Detect Changed */
 612         if (intr_loc & PCI_EXP_SLTSTA_PDC)
 613                 pciehp_handle_presence_change(slot);
 614
 615         /* Check Power Fault Detected */
 616         if ((intr_loc & PCI_EXP_SLTSTA_PFD) && !ctrl->power_fault_detected) {
 617                 ctrl->power_fault_detected = 1;
 618                 pciehp_handle_power_fault(slot);
 619         }
 620         return IRQ_HANDLED;
 621 }
 622
 623 int pciehp_get_max_lnk_width(struct slot *slot,
 624                                  enum pcie_link_width *value)
 625 {
 626         struct controller *ctrl = slot->ctrl;
 627         enum pcie_link_width lnk_wdth;
 628         u32     lnk_cap;
 629         int retval = 0;
 630
 631         retval = pciehp_readl(ctrl, PCI_EXP_LNKCAP, &lnk_cap);
 632         if (retval) {
 633                 ctrl_err(ctrl, "%s: Cannot read LNKCAP register\n", __func__);
 634                 return retval;
 635         }
 636
 637         switch ((lnk_cap & PCI_EXP_LNKSTA_NLW) >> 4){
 638         case 0:
 639                 lnk_wdth = PCIE_LNK_WIDTH_RESRV;
 640                 break;
 641         case 1:
 642                 lnk_wdth = PCIE_LNK_X1;
 643                 break;
 644         case 2:
 645                 lnk_wdth = PCIE_LNK_X2;
 646                 break;
 647         case 4:
 648                 lnk_wdth = PCIE_LNK_X4;
 649                 break;
 650         case 8:
 651                 lnk_wdth = PCIE_LNK_X8;
 652                 break;
 653         case 12:
 654                 lnk_wdth = PCIE_LNK_X12;
 655                 break;
 656         case 16:
 657                 lnk_wdth = PCIE_LNK_X16;
 658                 break;
 659         case 32:
 660                 lnk_wdth = PCIE_LNK_X32;
 661                 break;
 662         default:
 663                 lnk_wdth = PCIE_LNK_WIDTH_UNKNOWN;
 664                 break;
 665         }
 666
 667         *value = lnk_wdth;
 668         ctrl_dbg(ctrl, "Max link width = %d\n", lnk_wdth);
 669
 670         return retval;
 671 }
 672
 673 int pciehp_get_cur_lnk_width(struct slot *slot,
 674                                  enum pcie_link_width *value)
 675 {
 676         struct controller *ctrl = slot->ctrl;
 677         enum pcie_link_width lnk_wdth = PCIE_LNK_WIDTH_UNKNOWN;
 678         int retval = 0;
 679         u16 lnk_status;
 680
 681         retval = pciehp_readw(ctrl, PCI_EXP_LNKSTA, &lnk_status);
 682         if (retval) {
 683                 ctrl_err(ctrl, "%s: Cannot read LNKSTATUS register\n",
 684                          __func__);
 685                 return retval;
 686         }
 687
 688         switch ((lnk_status & PCI_EXP_LNKSTA_NLW) >> 4){
 689         case 0:
 690                 lnk_wdth = PCIE_LNK_WIDTH_RESRV;
 691                 break;
 692         case 1:
 693                 lnk_wdth = PCIE_LNK_X1;
 694                 break;
 695         case 2:
 696                 lnk_wdth = PCIE_LNK_X2;
 697                 break;
 698         case 4:
 699                 lnk_wdth = PCIE_LNK_X4;
 700                 break;
 701         case 8:
 702                 lnk_wdth = PCIE_LNK_X8;
 703                 break;
 704         case 12:
 705                 lnk_wdth = PCIE_LNK_X12;
 706                 break;
 707         case 16:
 708                 lnk_wdth = PCIE_LNK_X16;
 709                 break;
 710         case 32:
 711                 lnk_wdth = PCIE_LNK_X32;
 712                 break;
 713         default:
 714                 lnk_wdth = PCIE_LNK_WIDTH_UNKNOWN;
 715                 break;
 716         }
 717
 718         *value = lnk_wdth;
 719         ctrl_dbg(ctrl, "Current link width = %d\n", lnk_wdth);
 720
 721         return retval;
 722 }
 723
 724 int pcie_enable_notification(struct controller *ctrl)
 725 {
 726         u16 cmd, mask;
 727
 728         /*
 729          * TBD: Power fault detected software notification support.
 730          *
 731          * Power fault detected software notification is not enabled
 732          * now, because it caused power fault detected interrupt storm
 733          * on some machines. On those machines, power fault detected
 734          * bit in the slot status register was set again immediately
 735          * when it is cleared in the interrupt service routine, and
 736          * next power fault detected interrupt was notified again.
 737          */
 738         cmd = PCI_EXP_SLTCTL_PDCE;
 739         if (ATTN_BUTTN(ctrl))
 740                 cmd |= PCI_EXP_SLTCTL_ABPE;
 741         if (MRL_SENS(ctrl))
 742                 cmd |= PCI_EXP_SLTCTL_MRLSCE;
 743         if (!pciehp_poll_mode)
 744                 cmd |= PCI_EXP_SLTCTL_HPIE | PCI_EXP_SLTCTL_CCIE;
 745
 746         mask = (PCI_EXP_SLTCTL_PDCE | PCI_EXP_SLTCTL_ABPE |
 747                 PCI_EXP_SLTCTL_MRLSCE | PCI_EXP_SLTCTL_PFDE |
 748                 PCI_EXP_SLTCTL_HPIE | PCI_EXP_SLTCTL_CCIE);
 749
 750         if (pcie_write_cmd(ctrl, cmd, mask)) {
 751                 ctrl_err(ctrl, "Cannot enable software notification\n");
 752                 return -1;
 753         }
 754         return 0;
 755 }
 756
 757 static void pcie_disable_notification(struct controller *ctrl)
 758 {
 759         u16 mask;
 760         mask = (PCI_EXP_SLTCTL_PDCE | PCI_EXP_SLTCTL_ABPE |
 761                 PCI_EXP_SLTCTL_MRLSCE | PCI_EXP_SLTCTL_PFDE |
 762                 PCI_EXP_SLTCTL_HPIE | PCI_EXP_SLTCTL_CCIE |
 763                 PCI_EXP_SLTCTL_DLLSCE);
 764         if (pcie_write_cmd(ctrl, 0, mask))
 765                 ctrl_warn(ctrl, "Cannot disable software notification\n");
 766 }
 767
 768 int pcie_init_notification(struct controller *ctrl)
 769 {
 770         if (pciehp_request_irq(ctrl))
 771                 return -1;
 772         if (pcie_enable_notification(ctrl)) {
 773                 pciehp_free_irq(ctrl);
 774                 return -1;
 775         }
 776         ctrl->notification_enabled = 1;
 777         return 0;
 778 }
 779
 780 static void pcie_shutdown_notification(struct controller *ctrl)
 781 {
 782         if (ctrl->notification_enabled) {
 783                 pcie_disable_notification(ctrl);
 784                 pciehp_free_irq(ctrl);
 785                 ctrl->notification_enabled = 0;
 786         }
 787 }
 788
 789 static int pcie_init_slot(struct controller *ctrl)
 790 {
 791         struct slot *slot;
 792
 793         slot = kzalloc(sizeof(*slot), GFP_KERNEL);
 794         if (!slot)
 795                 return -ENOMEM;
 796
 797         slot->ctrl = ctrl;
 798         mutex_init(&slot->lock);
 799         INIT_DELAYED_WORK(&slot->work, pciehp_queue_pushbutton_work);
 800         ctrl->slot = slot;
 801         return 0;
 802 }
 803
 804 static void pcie_cleanup_slot(struct controller *ctrl)
 805 {
 806         struct slot *slot = ctrl->slot;
 807         cancel_delayed_work(&slot->work);
 808         flush_workqueue(pciehp_wq);
 809         kfree(slot);
 810 }
 811
 812 static inline void dbg_ctrl(struct controller *ctrl)
 813 {
 814         int i;
 815         u16 reg16;
 816         struct pci_dev *pdev = ctrl->pcie->port;
 817
 818         if (!pciehp_debug)
 819                 return;
 820
 821         ctrl_info(ctrl, "Hotplug Controller:\n");
 822         ctrl_info(ctrl, "  Seg/Bus/Dev/Func/IRQ : %s IRQ %d\n",
 823                   pci_name(pdev), pdev->irq);
 824         ctrl_info(ctrl, "  Vendor ID            : 0x%04x\n", pdev->vendor);
 825         ctrl_info(ctrl, "  Device ID            : 0x%04x\n", pdev->device);
 826         ctrl_info(ctrl, "  Subsystem ID         : 0x%04x\n",
 827                   pdev->subsystem_device);
 828         ctrl_info(ctrl, "  Subsystem Vendor ID  : 0x%04x\n",
 829                   pdev->subsystem_vendor);
 830         ctrl_info(ctrl, "  PCIe Cap offset      : 0x%02x\n",
 831                   pci_pcie_cap(pdev));
 832         for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
 833                 if (!pci_resource_len(pdev, i))
 834                         continue;
 835                 ctrl_info(ctrl, "  PCI resource [%d]     : %pR\n",
 836                           i, &pdev->resource[i]);
 837         }
 838         ctrl_info(ctrl, "Slot Capabilities      : 0x%08x\n", ctrl->slot_cap);
 839         ctrl_info(ctrl, "  Physical Slot Number : %d\n", PSN(ctrl));
 840         ctrl_info(ctrl, "  Attention Button     : %3s\n",
 841                   ATTN_BUTTN(ctrl) ? "yes" : "no");
 842         ctrl_info(ctrl, "  Power Controller     : %3s\n",
 843                   POWER_CTRL(ctrl) ? "yes" : "no");
 844         ctrl_info(ctrl, "  MRL Sensor           : %3s\n",
 845                   MRL_SENS(ctrl)   ? "yes" : "no");
 846         ctrl_info(ctrl, "  Attention Indicator  : %3s\n",
 847                   ATTN_LED(ctrl)   ? "yes" : "no");
 848         ctrl_info(ctrl, "  Power Indicator      : %3s\n",
 849                   PWR_LED(ctrl)    ? "yes" : "no");
 850         ctrl_info(ctrl, "  Hot-Plug Surprise    : %3s\n",
 851                   HP_SUPR_RM(ctrl) ? "yes" : "no");
 852         ctrl_info(ctrl, "  EMI Present          : %3s\n",
 853                   EMI(ctrl)        ? "yes" : "no");
 854         ctrl_info(ctrl, "  Command Completed    : %3s\n",
 855                   NO_CMD_CMPL(ctrl) ? "no" : "yes");
 856         pciehp_readw(ctrl, PCI_EXP_SLTSTA, &reg16);
 857         ctrl_info(ctrl, "Slot Status            : 0x%04x\n", reg16);
 858         pciehp_readw(ctrl, PCI_EXP_SLTCTL, &reg16);
 859         ctrl_info(ctrl, "Slot Control           : 0x%04x\n", reg16);
 860 }
 861
 862 struct controller *pcie_init(struct pcie_device *dev)
 863 {
 864         struct controller *ctrl;
 865         u32 slot_cap, link_cap;
 866         struct pci_dev *pdev = dev->port;
 867
 868         ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
 869         if (!ctrl) {
 870                 dev_err(&dev->device, "%s: Out of memory\n", __func__);
 871                 goto abort;
 872         }
 873         ctrl->pcie = dev;
 874         if (!pci_pcie_cap(pdev)) {
 875                 ctrl_err(ctrl, "Cannot find PCI Express capability\n");
 876                 goto abort_ctrl;
 877         }
 878         if (pciehp_readl(ctrl, PCI_EXP_SLTCAP, &slot_cap)) {
 879                 ctrl_err(ctrl, "Cannot read SLOTCAP register\n");
 880                 goto abort_ctrl;
 881         }
 882
 883         ctrl->slot_cap = slot_cap;
 884         mutex_init(&ctrl->ctrl_lock);
 885         init_waitqueue_head(&ctrl->queue);
 886         dbg_ctrl(ctrl);
 887         /*
 888          * Controller doesn't notify of command completion if the "No
 889          * Command Completed Support" bit is set in Slot Capability
 890          * register or the controller supports none of power
 891          * controller, attention led, power led and EMI.
 892          */
 893         if (NO_CMD_CMPL(ctrl) ||
 894             !(POWER_CTRL(ctrl) | ATTN_LED(ctrl) | PWR_LED(ctrl) | EMI(ctrl)))
 895             ctrl->no_cmd_complete = 1;
 896
 897         /* Check if Data Link Layer Link Active Reporting is implemented */
 898         if (pciehp_readl(ctrl, PCI_EXP_LNKCAP, &link_cap)) {
 899                 ctrl_err(ctrl, "%s: Cannot read LNKCAP register\n", __func__);
 900                 goto abort_ctrl;
 901         }
 902         if (link_cap & PCI_EXP_LNKCAP_DLLLARC) {
 903                 ctrl_dbg(ctrl, "Link Active Reporting supported\n");
 904                 ctrl->link_active_reporting = 1;
 905         }
 906
 907         /* Clear all remaining event bits in Slot Status register */
 908         if (pciehp_writew(ctrl, PCI_EXP_SLTSTA, 0x1f))
 909                 goto abort_ctrl;
 910
 911         /* Disable sotfware notification */
 912         pcie_disable_notification(ctrl);
 913
 914         ctrl_info(ctrl, "HPC vendor_id %x device_id %x ss_vid %x ss_did %x\n",
 915                   pdev->vendor, pdev->device, pdev->subsystem_vendor,
 916                   pdev->subsystem_device);
 917
 918         if (pcie_init_slot(ctrl))
 919                 goto abort_ctrl;
 920
 921         return ctrl;
 922
 923 abort_ctrl:
 924         kfree(ctrl);
 925 abort:
 926         return NULL;
 927 }
 928
 929 void pciehp_release_ctrl(struct controller *ctrl)
 930 {
 931         pcie_shutdown_notification(ctrl);
 932         pcie_cleanup_slot(ctrl);
 933         kfree(ctrl);
 934 }