drivers/pci/hotplug/ibmphp_hpc.c

   1 /*
   2  * IBM Hot Plug Controller Driver
   3  *
   4  * Written By: Jyoti Shah, IBM Corporation
   5  *
   6  * Copyright (C) 2001-2003 IBM Corp.
   7  *
   8  * All rights reserved.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or (at
  13  * your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful, but
  16  * WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  18  * NON INFRINGEMENT.  See the GNU General Public License for more
  19  * details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24  *
  25  * Send feedback to <gregkh@us.ibm.com>
  26  *                  <jshah@us.ibm.com>
  27  *
  28  */
  29
  30 #include <linux/wait.h>
  31 #include <linux/time.h>
  32 #include <linux/delay.h>
  33 #include <linux/module.h>
  34 #include <linux/pci.h>
  35 #include <linux/init.h>
  36 #include <linux/mutex.h>
  37 #include <linux/sched.h>
  38 #include <linux/semaphore.h>
  39 #include <linux/kthread.h>
  40 #include "ibmphp.h"
  41
  42 static int to_debug = 0;
  43 #define debug_polling(fmt, arg...)      do { if (to_debug) debug (fmt, arg); } while (0)
  44
  45 //----------------------------------------------------------------------------
  46 // timeout values
  47 //----------------------------------------------------------------------------
  48 #define CMD_COMPLETE_TOUT_SEC   60      // give HPC 60 sec to finish cmd
  49 #define HPC_CTLR_WORKING_TOUT   60      // give HPC 60 sec to finish cmd
  50 #define HPC_GETACCESS_TIMEOUT   60      // seconds
  51 #define POLL_INTERVAL_SEC       2       // poll HPC every 2 seconds
  52 #define POLL_LATCH_CNT          5       // poll latch 5 times, then poll slots
  53
  54 //----------------------------------------------------------------------------
  55 // Winnipeg Architected Register Offsets
  56 //----------------------------------------------------------------------------
  57 #define WPG_I2CMBUFL_OFFSET     0x08    // I2C Message Buffer Low
  58 #define WPG_I2CMOSUP_OFFSET     0x10    // I2C Master Operation Setup Reg
  59 #define WPG_I2CMCNTL_OFFSET     0x20    // I2C Master Control Register
  60 #define WPG_I2CPARM_OFFSET      0x40    // I2C Parameter Register
  61 #define WPG_I2CSTAT_OFFSET      0x70    // I2C Status Register
  62
  63 //----------------------------------------------------------------------------
  64 // Winnipeg Store Type commands (Add this commands to the register offset)
  65 //----------------------------------------------------------------------------
  66 #define WPG_I2C_AND             0x1000  // I2C AND operation
  67 #define WPG_I2C_OR              0x2000  // I2C OR operation
  68
  69 //----------------------------------------------------------------------------
  70 // Command set for I2C Master Operation Setup Register
  71 //----------------------------------------------------------------------------
  72 #define WPG_READATADDR_MASK     0x00010000      // read,bytes,I2C shifted,index
  73 #define WPG_WRITEATADDR_MASK    0x40010000      // write,bytes,I2C shifted,index
  74 #define WPG_READDIRECT_MASK     0x10010000
  75 #define WPG_WRITEDIRECT_MASK    0x60010000
  76
  77
  78 //----------------------------------------------------------------------------
  79 // bit masks for I2C Master Control Register
  80 //----------------------------------------------------------------------------
  81 #define WPG_I2CMCNTL_STARTOP_MASK       0x00000002      // Start the Operation
  82
  83 //----------------------------------------------------------------------------
  84 //
  85 //----------------------------------------------------------------------------
  86 #define WPG_I2C_IOREMAP_SIZE    0x2044  // size of linear address interval
  87
  88 //----------------------------------------------------------------------------
  89 // command index
  90 //----------------------------------------------------------------------------
  91 #define WPG_1ST_SLOT_INDEX      0x01    // index - 1st slot for ctlr
  92 #define WPG_CTLR_INDEX          0x0F    // index - ctlr
  93 #define WPG_1ST_EXTSLOT_INDEX   0x10    // index - 1st ext slot for ctlr
  94 #define WPG_1ST_BUS_INDEX       0x1F    // index - 1st bus for ctlr
  95
  96 //----------------------------------------------------------------------------
  97 // macro utilities
  98 //----------------------------------------------------------------------------
  99 // if bits 20,22,25,26,27,29,30 are OFF return 1
 100 #define HPC_I2CSTATUS_CHECK(s)  ((u8)((s & 0x00000A76) ? 0 : 1))
 101
 102 //----------------------------------------------------------------------------
 103 // global variables
 104 //----------------------------------------------------------------------------
 105 static struct mutex sem_hpcaccess;      // lock access to HPC
 106 static struct semaphore semOperations;  // lock all operations and
 107                                         // access to data structures
 108 static struct semaphore sem_exit;       // make sure polling thread goes away
 109 static struct task_struct *ibmphp_poll_thread;
 110 //----------------------------------------------------------------------------
 111 // local function prototypes
 112 //----------------------------------------------------------------------------
 113 static u8 i2c_ctrl_read (struct controller *, void __iomem *, u8);
 114 static u8 i2c_ctrl_write (struct controller *, void __iomem *, u8, u8);
 115 static u8 hpc_writecmdtoindex (u8, u8);
 116 static u8 hpc_readcmdtoindex (u8, u8);
 117 static void get_hpc_access (void);
 118 static void free_hpc_access (void);
 119 static int poll_hpc(void *data);
 120 static int process_changeinstatus (struct slot *, struct slot *);
 121 static int process_changeinlatch (u8, u8, struct controller *);
 122 static int hpc_wait_ctlr_notworking (int, struct controller *, void __iomem *, u8 *);
 123 //----------------------------------------------------------------------------
 124
 125
 126 /*----------------------------------------------------------------------
 127 * Name:    ibmphp_hpc_initvars
 128 *
 129 * Action:  initialize semaphores and variables
 130 *---------------------------------------------------------------------*/
 131 void __init ibmphp_hpc_initvars (void)
 132 {
 133         debug ("%s - Entry\n", __func__);
 134
 135         mutex_init(&sem_hpcaccess);
 136         init_MUTEX (&semOperations);
 137         init_MUTEX_LOCKED (&sem_exit);
 138         to_debug = 0;
 139
 140         debug ("%s - Exit\n", __func__);
 141 }
 142
 143 /*----------------------------------------------------------------------
 144 * Name:    i2c_ctrl_read
 145 *
 146 * Action:  read from HPC over I2C
 147 *
 148 *---------------------------------------------------------------------*/
 149 static u8 i2c_ctrl_read (struct controller *ctlr_ptr, void __iomem *WPGBbar, u8 index)
 150 {
 151         u8 status;
 152         int i;
 153         void __iomem *wpg_addr; // base addr + offset
 154         unsigned long wpg_data; // data to/from WPG LOHI format
 155         unsigned long ultemp;
 156         unsigned long data;     // actual data HILO format
 157
 158         debug_polling ("%s - Entry WPGBbar[%p] index[%x] \n", __func__, WPGBbar, index);
 159
 160         //--------------------------------------------------------------------
 161         // READ - step 1
 162         // read at address, byte length, I2C address (shifted), index
 163         // or read direct, byte length, index
 164         if (ctlr_ptr->ctlr_type == 0x02) {
 165                 data = WPG_READATADDR_MASK;
 166                 // fill in I2C address
 167                 ultemp = (unsigned long)ctlr_ptr->u.wpeg_ctlr.i2c_addr;
 168                 ultemp = ultemp >> 1;
 169                 data |= (ultemp << 8);
 170
 171                 // fill in index
 172                 data |= (unsigned long)index;
 173         } else if (ctlr_ptr->ctlr_type == 0x04) {
 174                 data = WPG_READDIRECT_MASK;
 175
 176                 // fill in index
 177                 ultemp = (unsigned long)index;
 178                 ultemp = ultemp << 8;
 179                 data |= ultemp;
 180         } else {
 181                 err ("this controller type is not supported \n");
 182                 return HPC_ERROR;
 183         }
 184
 185         wpg_data = swab32 (data);       // swap data before writing
 186         wpg_addr = WPGBbar + WPG_I2CMOSUP_OFFSET;
 187         writel (wpg_data, wpg_addr);
 188
 189         //--------------------------------------------------------------------
 190         // READ - step 2 : clear the message buffer
 191         data = 0x00000000;
 192         wpg_data = swab32 (data);
 193         wpg_addr = WPGBbar + WPG_I2CMBUFL_OFFSET;
 194         writel (wpg_data, wpg_addr);
 195
 196         //--------------------------------------------------------------------
 197         // READ - step 3 : issue start operation, I2C master control bit 30:ON
 198         //                 2020 : [20] OR operation at [20] offset 0x20
 199         data = WPG_I2CMCNTL_STARTOP_MASK;
 200         wpg_data = swab32 (data);
 201         wpg_addr = WPGBbar + WPG_I2CMCNTL_OFFSET + WPG_I2C_OR;
 202         writel (wpg_data, wpg_addr);
 203
 204         //--------------------------------------------------------------------
 205         // READ - step 4 : wait until start operation bit clears
 206         i = CMD_COMPLETE_TOUT_SEC;
 207         while (i) {
 208                 msleep(10);
 209                 wpg_addr = WPGBbar + WPG_I2CMCNTL_OFFSET;
 210                 wpg_data = readl (wpg_addr);
 211                 data = swab32 (wpg_data);
 212                 if (!(data & WPG_I2CMCNTL_STARTOP_MASK))
 213                         break;
 214                 i--;
 215         }
 216         if (i == 0) {
 217                 debug ("%s - Error : WPG timeout\n", __func__);
 218                 return HPC_ERROR;
 219         }
 220         //--------------------------------------------------------------------
 221         // READ - step 5 : read I2C status register
 222         i = CMD_COMPLETE_TOUT_SEC;
 223         while (i) {
 224                 msleep(10);
 225                 wpg_addr = WPGBbar + WPG_I2CSTAT_OFFSET;
 226                 wpg_data = readl (wpg_addr);
 227                 data = swab32 (wpg_data);
 228                 if (HPC_I2CSTATUS_CHECK (data))
 229                         break;
 230                 i--;
 231         }
 232         if (i == 0) {
 233                 debug ("ctrl_read - Exit Error:I2C timeout\n");
 234                 return HPC_ERROR;
 235         }
 236
 237         //--------------------------------------------------------------------
 238         // READ - step 6 : get DATA
 239         wpg_addr = WPGBbar + WPG_I2CMBUFL_OFFSET;
 240         wpg_data = readl (wpg_addr);
 241         data = swab32 (wpg_data);
 242
 243         status = (u8) data;
 244
 245         debug_polling ("%s - Exit index[%x] status[%x]\n", __func__, index, status);
 246
 247         return (status);
 248 }
 249
 250 /*----------------------------------------------------------------------
 251 * Name:    i2c_ctrl_write
 252 *
 253 * Action:  write to HPC over I2C
 254 *
 255 * Return   0 or error codes
 256 *---------------------------------------------------------------------*/
 257 static u8 i2c_ctrl_write (struct controller *ctlr_ptr, void __iomem *WPGBbar, u8 index, u8 cmd)
 258 {
 259         u8 rc;
 260         void __iomem *wpg_addr; // base addr + offset
 261         unsigned long wpg_data; // data to/from WPG LOHI format
 262         unsigned long ultemp;
 263         unsigned long data;     // actual data HILO format
 264         int i;
 265
 266         debug_polling ("%s - Entry WPGBbar[%p] index[%x] cmd[%x]\n", __func__, WPGBbar, index, cmd);
 267
 268         rc = 0;
 269         //--------------------------------------------------------------------
 270         // WRITE - step 1
 271         // write at address, byte length, I2C address (shifted), index
 272         // or write direct, byte length, index
 273         data = 0x00000000;
 274
 275         if (ctlr_ptr->ctlr_type == 0x02) {
 276                 data = WPG_WRITEATADDR_MASK;
 277                 // fill in I2C address
 278                 ultemp = (unsigned long)ctlr_ptr->u.wpeg_ctlr.i2c_addr;
 279                 ultemp = ultemp >> 1;
 280                 data |= (ultemp << 8);
 281
 282                 // fill in index
 283                 data |= (unsigned long)index;
 284         } else if (ctlr_ptr->ctlr_type == 0x04) {
 285                 data = WPG_WRITEDIRECT_MASK;
 286
 287                 // fill in index
 288                 ultemp = (unsigned long)index;
 289                 ultemp = ultemp << 8;
 290                 data |= ultemp;
 291         } else {
 292                 err ("this controller type is not supported \n");
 293                 return HPC_ERROR;
 294         }
 295
 296         wpg_data = swab32 (data);       // swap data before writing
 297         wpg_addr = WPGBbar + WPG_I2CMOSUP_OFFSET;
 298         writel (wpg_data, wpg_addr);
 299
 300         //--------------------------------------------------------------------
 301         // WRITE - step 2 : clear the message buffer
 302         data = 0x00000000 | (unsigned long)cmd;
 303         wpg_data = swab32 (data);
 304         wpg_addr = WPGBbar + WPG_I2CMBUFL_OFFSET;
 305         writel (wpg_data, wpg_addr);
 306
 307         //--------------------------------------------------------------------
 308         // WRITE - step 3 : issue start operation,I2C master control bit 30:ON
 309         //                 2020 : [20] OR operation at [20] offset 0x20
 310         data = WPG_I2CMCNTL_STARTOP_MASK;
 311         wpg_data = swab32 (data);
 312         wpg_addr = WPGBbar + WPG_I2CMCNTL_OFFSET + WPG_I2C_OR;
 313         writel (wpg_data, wpg_addr);
 314
 315         //--------------------------------------------------------------------
 316         // WRITE - step 4 : wait until start operation bit clears
 317         i = CMD_COMPLETE_TOUT_SEC;
 318         while (i) {
 319                 msleep(10);
 320                 wpg_addr = WPGBbar + WPG_I2CMCNTL_OFFSET;
 321                 wpg_data = readl (wpg_addr);
 322                 data = swab32 (wpg_data);
 323                 if (!(data & WPG_I2CMCNTL_STARTOP_MASK))
 324                         break;
 325                 i--;
 326         }
 327         if (i == 0) {
 328                 debug ("%s - Exit Error:WPG timeout\n", __func__);
 329                 rc = HPC_ERROR;
 330         }
 331
 332         //--------------------------------------------------------------------
 333         // WRITE - step 5 : read I2C status register
 334         i = CMD_COMPLETE_TOUT_SEC;
 335         while (i) {
 336                 msleep(10);
 337                 wpg_addr = WPGBbar + WPG_I2CSTAT_OFFSET;
 338                 wpg_data = readl (wpg_addr);
 339                 data = swab32 (wpg_data);
 340                 if (HPC_I2CSTATUS_CHECK (data))
 341                         break;
 342                 i--;
 343         }
 344         if (i == 0) {
 345                 debug ("ctrl_read - Error : I2C timeout\n");
 346                 rc = HPC_ERROR;
 347         }
 348
 349         debug_polling ("%s Exit rc[%x]\n", __func__, rc);
 350         return (rc);
 351 }
 352
 353 //------------------------------------------------------------
 354 //  Read from ISA type HPC
 355 //------------------------------------------------------------
 356 static u8 isa_ctrl_read (struct controller *ctlr_ptr, u8 offset)
 357 {
 358         u16 start_address;
 359         u16 end_address;
 360         u8 data;
 361
 362         start_address = ctlr_ptr->u.isa_ctlr.io_start;
 363         end_address = ctlr_ptr->u.isa_ctlr.io_end;
 364         data = inb (start_address + offset);
 365         return data;
 366 }
 367
 368 //--------------------------------------------------------------
 369 // Write to ISA type HPC
 370 //--------------------------------------------------------------
 371 static void isa_ctrl_write (struct controller *ctlr_ptr, u8 offset, u8 data)
 372 {
 373         u16 start_address;
 374         u16 port_address;
 375
 376         start_address = ctlr_ptr->u.isa_ctlr.io_start;
 377         port_address = start_address + (u16) offset;
 378         outb (data, port_address);
 379 }
 380
 381 static u8 pci_ctrl_read (struct controller *ctrl, u8 offset)
 382 {
 383         u8 data = 0x00;
 384         debug ("inside pci_ctrl_read\n");
 385         if (ctrl->ctrl_dev)
 386                 pci_read_config_byte (ctrl->ctrl_dev, HPC_PCI_OFFSET + offset, &data);
 387         return data;
 388 }
 389
 390 static u8 pci_ctrl_write (struct controller *ctrl, u8 offset, u8 data)
 391 {
 392         u8 rc = -ENODEV;
 393         debug ("inside pci_ctrl_write\n");
 394         if (ctrl->ctrl_dev) {
 395                 pci_write_config_byte (ctrl->ctrl_dev, HPC_PCI_OFFSET + offset, data);
 396                 rc = 0;
 397         }
 398         return rc;
 399 }
 400
 401 static u8 ctrl_read (struct controller *ctlr, void __iomem *base, u8 offset)
 402 {
 403         u8 rc;
 404         switch (ctlr->ctlr_type) {
 405         case 0:
 406                 rc = isa_ctrl_read (ctlr, offset);
 407                 break;
 408         case 1:
 409                 rc = pci_ctrl_read (ctlr, offset);
 410                 break;
 411         case 2:
 412         case 4:
 413                 rc = i2c_ctrl_read (ctlr, base, offset);
 414                 break;
 415         default:
 416                 return -ENODEV;
 417         }
 418         return rc;
 419 }
 420
 421 static u8 ctrl_write (struct controller *ctlr, void __iomem *base, u8 offset, u8 data)
 422 {
 423         u8 rc = 0;
 424         switch (ctlr->ctlr_type) {
 425         case 0:
 426                 isa_ctrl_write(ctlr, offset, data);
 427                 break;
 428         case 1:
 429                 rc = pci_ctrl_write (ctlr, offset, data);
 430                 break;
 431         case 2:
 432         case 4:
 433                 rc = i2c_ctrl_write(ctlr, base, offset, data);
 434                 break;
 435         default:
 436                 return -ENODEV;
 437         }
 438         return rc;
 439 }
 440 /*----------------------------------------------------------------------
 441 * Name:    hpc_writecmdtoindex()
 442 *
 443 * Action:  convert a write command to proper index within a controller
 444 *
 445 * Return   index, HPC_ERROR
 446 *---------------------------------------------------------------------*/
 447 static u8 hpc_writecmdtoindex (u8 cmd, u8 index)
 448 {
 449         u8 rc;
 450
 451         switch (cmd) {
 452         case HPC_CTLR_ENABLEIRQ:        // 0x00.N.15
 453         case HPC_CTLR_CLEARIRQ: // 0x06.N.15
 454         case HPC_CTLR_RESET:    // 0x07.N.15
 455         case HPC_CTLR_IRQSTEER: // 0x08.N.15
 456         case HPC_CTLR_DISABLEIRQ:       // 0x01.N.15
 457         case HPC_ALLSLOT_ON:    // 0x11.N.15
 458         case HPC_ALLSLOT_OFF:   // 0x12.N.15
 459                 rc = 0x0F;
 460                 break;
 461
 462         case HPC_SLOT_OFF:      // 0x02.Y.0-14
 463         case HPC_SLOT_ON:       // 0x03.Y.0-14
 464         case HPC_SLOT_ATTNOFF:  // 0x04.N.0-14
 465         case HPC_SLOT_ATTNON:   // 0x05.N.0-14
 466         case HPC_SLOT_BLINKLED: // 0x13.N.0-14
 467                 rc = index;
 468                 break;
 469
 470         case HPC_BUS_33CONVMODE:
 471         case HPC_BUS_66CONVMODE:
 472         case HPC_BUS_66PCIXMODE:
 473         case HPC_BUS_100PCIXMODE:
 474         case HPC_BUS_133PCIXMODE:
 475                 rc = index + WPG_1ST_BUS_INDEX - 1;
 476                 break;
 477
 478         default:
 479                 err ("hpc_writecmdtoindex - Error invalid cmd[%x]\n", cmd);
 480                 rc = HPC_ERROR;
 481         }
 482
 483         return rc;
 484 }
 485
 486 /*----------------------------------------------------------------------
 487 * Name:    hpc_readcmdtoindex()
 488 *
 489 * Action:  convert a read command to proper index within a controller
 490 *
 491 * Return   index, HPC_ERROR
 492 *---------------------------------------------------------------------*/
 493 static u8 hpc_readcmdtoindex (u8 cmd, u8 index)
 494 {
 495         u8 rc;
 496
 497         switch (cmd) {
 498         case READ_CTLRSTATUS:
 499                 rc = 0x0F;
 500                 break;
 501         case READ_SLOTSTATUS:
 502         case READ_ALLSTAT:
 503                 rc = index;
 504                 break;
 505         case READ_EXTSLOTSTATUS:
 506                 rc = index + WPG_1ST_EXTSLOT_INDEX;
 507                 break;
 508         case READ_BUSSTATUS:
 509                 rc = index + WPG_1ST_BUS_INDEX - 1;
 510                 break;
 511         case READ_SLOTLATCHLOWREG:
 512                 rc = 0x28;
 513                 break;
 514         case READ_REVLEVEL:
 515                 rc = 0x25;
 516                 break;
 517         case READ_HPCOPTIONS:
 518                 rc = 0x27;
 519                 break;
 520         default:
 521                 rc = HPC_ERROR;
 522         }
 523         return rc;
 524 }
 525
 526 /*----------------------------------------------------------------------
 527 * Name:    HPCreadslot()
 528 *
 529 * Action:  issue a READ command to HPC
 530 *
 531 * Input:   pslot   - cannot be NULL for READ_ALLSTAT
 532 *          pstatus - can be NULL for READ_ALLSTAT
 533 *
 534 * Return   0 or error codes
 535 *---------------------------------------------------------------------*/
 536 int ibmphp_hpc_readslot (struct slot * pslot, u8 cmd, u8 * pstatus)
 537 {
 538         void __iomem *wpg_bbar = NULL;
 539         struct controller *ctlr_ptr;
 540         struct list_head *pslotlist;
 541         u8 index, status;
 542         int rc = 0;
 543         int busindex;
 544
 545         debug_polling ("%s - Entry pslot[%p] cmd[%x] pstatus[%p]\n", __func__, pslot, cmd, pstatus);
 546
 547         if ((pslot == NULL)
 548             || ((pstatus == NULL) && (cmd != READ_ALLSTAT) && (cmd != READ_BUSSTATUS))) {
 549                 rc = -EINVAL;
 550                 err ("%s - Error invalid pointer, rc[%d]\n", __func__, rc);
 551                 return rc;
 552         }
 553
 554         if (cmd == READ_BUSSTATUS) {
 555                 busindex = ibmphp_get_bus_index (pslot->bus);
 556                 if (busindex < 0) {
 557                         rc = -EINVAL;
 558                         err ("%s - Exit Error:invalid bus, rc[%d]\n", __func__, rc);
 559                         return rc;
 560                 } else
 561                         index = (u8) busindex;
 562         } else
 563                 index = pslot->ctlr_index;
 564
 565         index = hpc_readcmdtoindex (cmd, index);
 566
 567         if (index == HPC_ERROR) {
 568                 rc = -EINVAL;
 569                 err ("%s - Exit Error:invalid index, rc[%d]\n", __func__, rc);
 570                 return rc;
 571         }
 572
 573         ctlr_ptr = pslot->ctrl;
 574
 575         get_hpc_access ();
 576
 577         //--------------------------------------------------------------------
 578         // map physical address to logical address
 579         //--------------------------------------------------------------------
 580         if ((ctlr_ptr->ctlr_type == 2) || (ctlr_ptr->ctlr_type == 4))
 581                 wpg_bbar = ioremap (ctlr_ptr->u.wpeg_ctlr.wpegbbar, WPG_I2C_IOREMAP_SIZE);
 582
 583         //--------------------------------------------------------------------
 584         // check controller status before reading
 585         //--------------------------------------------------------------------
 586         rc = hpc_wait_ctlr_notworking (HPC_CTLR_WORKING_TOUT, ctlr_ptr, wpg_bbar, &status);
 587         if (!rc) {
 588                 switch (cmd) {
 589                 case READ_ALLSTAT:
 590                         // update the slot structure
 591                         pslot->ctrl->status = status;
 592                         pslot->status = ctrl_read (ctlr_ptr, wpg_bbar, index);
 593                         rc = hpc_wait_ctlr_notworking (HPC_CTLR_WORKING_TOUT, ctlr_ptr, wpg_bbar,
 594                                                        &status);
 595                         if (!rc)
 596                                 pslot->ext_status = ctrl_read (ctlr_ptr, wpg_bbar, index + WPG_1ST_EXTSLOT_INDEX);
 597
 598                         break;
 599
 600                 case READ_SLOTSTATUS:
 601                         // DO NOT update the slot structure
 602                         *pstatus = ctrl_read (ctlr_ptr, wpg_bbar, index);
 603                         break;
 604
 605                 case READ_EXTSLOTSTATUS:
 606                         // DO NOT update the slot structure
 607                         *pstatus = ctrl_read (ctlr_ptr, wpg_bbar, index);
 608                         break;
 609
 610                 case READ_CTLRSTATUS:
 611                         // DO NOT update the slot structure
 612                         *pstatus = status;
 613                         break;
 614
 615                 case READ_BUSSTATUS:
 616                         pslot->busstatus = ctrl_read (ctlr_ptr, wpg_bbar, index);
 617                         break;
 618                 case READ_REVLEVEL:
 619                         *pstatus = ctrl_read (ctlr_ptr, wpg_bbar, index);
 620                         break;
 621                 case READ_HPCOPTIONS:
 622                         *pstatus = ctrl_read (ctlr_ptr, wpg_bbar, index);
 623                         break;
 624                 case READ_SLOTLATCHLOWREG:
 625                         // DO NOT update the slot structure
 626                         *pstatus = ctrl_read (ctlr_ptr, wpg_bbar, index);
 627                         break;
 628
 629                         // Not used
 630                 case READ_ALLSLOT:
 631                         list_for_each (pslotlist, &ibmphp_slot_head) {
 632                                 pslot = list_entry (pslotlist, struct slot, ibm_slot_list);
 633                                 index = pslot->ctlr_index;
 634                                 rc = hpc_wait_ctlr_notworking (HPC_CTLR_WORKING_TOUT, ctlr_ptr,
 635                                                                 wpg_bbar, &status);
 636                                 if (!rc) {
 637                                         pslot->status = ctrl_read (ctlr_ptr, wpg_bbar, index);
 638                                         rc = hpc_wait_ctlr_notworking (HPC_CTLR_WORKING_TOUT,
 639                                                                         ctlr_ptr, wpg_bbar, &status);
 640                                         if (!rc)
 641                                                 pslot->ext_status =
 642                                                     ctrl_read (ctlr_ptr, wpg_bbar,
 643                                                                 index + WPG_1ST_EXTSLOT_INDEX);
 644                                 } else {
 645                                         err ("%s - Error ctrl_read failed\n", __func__);
 646                                         rc = -EINVAL;
 647                                         break;
 648                                 }
 649                         }
 650                         break;
 651                 default:
 652                         rc = -EINVAL;
 653                         break;
 654                 }
 655         }
 656         //--------------------------------------------------------------------
 657         // cleanup
 658         //--------------------------------------------------------------------
 659
 660         // remove physical to logical address mapping
 661         if ((ctlr_ptr->ctlr_type == 2) || (ctlr_ptr->ctlr_type == 4))
 662                 iounmap (wpg_bbar);
 663
 664         free_hpc_access ();
 665
 666         debug_polling ("%s - Exit rc[%d]\n", __func__, rc);
 667         return rc;
 668 }
 669
 670 /*----------------------------------------------------------------------
 671 * Name:    ibmphp_hpc_writeslot()
 672 *
 673 * Action: issue a WRITE command to HPC
 674 *---------------------------------------------------------------------*/
 675 int ibmphp_hpc_writeslot (struct slot * pslot, u8 cmd)
 676 {
 677         void __iomem *wpg_bbar = NULL;
 678         struct controller *ctlr_ptr;
 679         u8 index, status;
 680         int busindex;
 681         u8 done;
 682         int rc = 0;
 683         int timeout;
 684
 685         debug_polling ("%s - Entry pslot[%p] cmd[%x]\n", __func__, pslot, cmd);
 686         if (pslot == NULL) {
 687                 rc = -EINVAL;
 688                 err ("%s - Error Exit rc[%d]\n", __func__, rc);
 689                 return rc;
 690         }
 691
 692         if ((cmd == HPC_BUS_33CONVMODE) || (cmd == HPC_BUS_66CONVMODE) ||
 693                 (cmd == HPC_BUS_66PCIXMODE) || (cmd == HPC_BUS_100PCIXMODE) ||
 694                 (cmd == HPC_BUS_133PCIXMODE)) {
 695                 busindex = ibmphp_get_bus_index (pslot->bus);
 696                 if (busindex < 0) {
 697                         rc = -EINVAL;
 698                         err ("%s - Exit Error:invalid bus, rc[%d]\n", __func__, rc);
 699                         return rc;
 700                 } else
 701                         index = (u8) busindex;
 702         } else
 703                 index = pslot->ctlr_index;
 704
 705         index = hpc_writecmdtoindex (cmd, index);
 706
 707         if (index == HPC_ERROR) {
 708                 rc = -EINVAL;
 709                 err ("%s - Error Exit rc[%d]\n", __func__, rc);
 710                 return rc;
 711         }
 712
 713         ctlr_ptr = pslot->ctrl;
 714
 715         get_hpc_access ();
 716
 717         //--------------------------------------------------------------------
 718         // map physical address to logical address
 719         //--------------------------------------------------------------------
 720         if ((ctlr_ptr->ctlr_type == 2) || (ctlr_ptr->ctlr_type == 4)) {
 721                 wpg_bbar = ioremap (ctlr_ptr->u.wpeg_ctlr.wpegbbar, WPG_I2C_IOREMAP_SIZE);
 722
 723                 debug ("%s - ctlr id[%x] physical[%lx] logical[%lx] i2c[%x]\n", __func__,
 724                 ctlr_ptr->ctlr_id, (ulong) (ctlr_ptr->u.wpeg_ctlr.wpegbbar), (ulong) wpg_bbar,
 725                 ctlr_ptr->u.wpeg_ctlr.i2c_addr);
 726         }
 727         //--------------------------------------------------------------------
 728         // check controller status before writing
 729         //--------------------------------------------------------------------
 730         rc = hpc_wait_ctlr_notworking (HPC_CTLR_WORKING_TOUT, ctlr_ptr, wpg_bbar, &status);
 731         if (!rc) {
 732
 733                 ctrl_write (ctlr_ptr, wpg_bbar, index, cmd);
 734
 735                 //--------------------------------------------------------------------
 736                 // check controller is still not working on the command
 737                 //--------------------------------------------------------------------
 738                 timeout = CMD_COMPLETE_TOUT_SEC;
 739                 done = 0;
 740                 while (!done) {
 741                         rc = hpc_wait_ctlr_notworking (HPC_CTLR_WORKING_TOUT, ctlr_ptr, wpg_bbar,
 742                                                         &status);
 743                         if (!rc) {
 744                                 if (NEEDTOCHECK_CMDSTATUS (cmd)) {
 745                                         if (CTLR_FINISHED (status) == HPC_CTLR_FINISHED_YES)
 746                                                 done = 1;
 747                                 } else
 748                                         done = 1;
 749                         }
 750                         if (!done) {
 751                                 msleep(1000);
 752                                 if (timeout < 1) {
 753                                         done = 1;
 754                                         err ("%s - Error command complete timeout\n", __func__);
 755                                         rc = -EFAULT;
 756                                 } else
 757                                         timeout--;
 758                         }
 759                 }
 760                 ctlr_ptr->status = status;
 761         }
 762         // cleanup
 763
 764         // remove physical to logical address mapping
 765         if ((ctlr_ptr->ctlr_type == 2) || (ctlr_ptr->ctlr_type == 4))
 766                 iounmap (wpg_bbar);
 767         free_hpc_access ();
 768
 769         debug_polling ("%s - Exit rc[%d]\n", __func__, rc);
 770         return rc;
 771 }
 772
 773 /*----------------------------------------------------------------------
 774 * Name:    get_hpc_access()
 775 *
 776 * Action: make sure only one process can access HPC at one time
 777 *---------------------------------------------------------------------*/
 778 static void get_hpc_access (void)
 779 {
 780         mutex_lock(&sem_hpcaccess);
 781 }
 782
 783 /*----------------------------------------------------------------------
 784 * Name:    free_hpc_access()
 785 *---------------------------------------------------------------------*/
 786 void free_hpc_access (void)
 787 {
 788         mutex_unlock(&sem_hpcaccess);
 789 }
 790
 791 /*----------------------------------------------------------------------
 792 * Name:    ibmphp_lock_operations()
 793 *
 794 * Action: make sure only one process can change the data structure
 795 *---------------------------------------------------------------------*/
 796 void ibmphp_lock_operations (void)
 797 {
 798         down (&semOperations);
 799         to_debug = 1;
 800 }
 801
 802 /*----------------------------------------------------------------------
 803 * Name:    ibmphp_unlock_operations()
 804 *---------------------------------------------------------------------*/
 805 void ibmphp_unlock_operations (void)
 806 {
 807         debug ("%s - Entry\n", __func__);
 808         up (&semOperations);
 809         to_debug = 0;
 810         debug ("%s - Exit\n", __func__);
 811 }
 812
 813 /*----------------------------------------------------------------------
 814 * Name:    poll_hpc()
 815 *---------------------------------------------------------------------*/
 816 #define POLL_LATCH_REGISTER     0
 817 #define POLL_SLOTS              1
 818 #define POLL_SLEEP              2
 819 static int poll_hpc(void *data)
 820 {
 821         struct slot myslot;
 822         struct slot *pslot = NULL;
 823         struct list_head *pslotlist;
 824         int rc;
 825         int poll_state = POLL_LATCH_REGISTER;
 826         u8 oldlatchlow = 0x00;
 827         u8 curlatchlow = 0x00;
 828         int poll_count = 0;
 829         u8 ctrl_count = 0x00;
 830
 831         debug ("%s - Entry\n", __func__);
 832
 833         while (!kthread_should_stop()) {
 834                 /* try to get the lock to do some kind of hardware access */
 835                 down (&semOperations);
 836
 837                 switch (poll_state) {
 838                 case POLL_LATCH_REGISTER:
 839                         oldlatchlow = curlatchlow;
 840                         ctrl_count = 0x00;
 841                         list_for_each (pslotlist, &ibmphp_slot_head) {
 842                                 if (ctrl_count >= ibmphp_get_total_controllers())
 843                                         break;
 844                                 pslot = list_entry (pslotlist, struct slot, ibm_slot_list);
 845                                 if (pslot->ctrl->ctlr_relative_id == ctrl_count) {
 846                                         ctrl_count++;
 847                                         if (READ_SLOT_LATCH (pslot->ctrl)) {
 848                                                 rc = ibmphp_hpc_readslot (pslot,
 849                                                                           READ_SLOTLATCHLOWREG,
 850                                                                           &curlatchlow);
 851                                                 if (oldlatchlow != curlatchlow)
 852                                                         process_changeinlatch (oldlatchlow,
 853                                                                                curlatchlow,
 854                                                                                pslot->ctrl);
 855                                         }
 856                                 }
 857                         }
 858                         ++poll_count;
 859                         poll_state = POLL_SLEEP;
 860                         break;
 861                 case POLL_SLOTS:
 862                         list_for_each (pslotlist, &ibmphp_slot_head) {
 863                                 pslot = list_entry (pslotlist, struct slot, ibm_slot_list);
 864                                 // make a copy of the old status
 865                                 memcpy ((void *) &myslot, (void *) pslot,
 866                                         sizeof (struct slot));
 867                                 rc = ibmphp_hpc_readslot (pslot, READ_ALLSTAT, NULL);
 868                                 if ((myslot.status != pslot->status)
 869                                     || (myslot.ext_status != pslot->ext_status))
 870                                         process_changeinstatus (pslot, &myslot);
 871                         }
 872                         ctrl_count = 0x00;
 873                         list_for_each (pslotlist, &ibmphp_slot_head) {
 874                                 if (ctrl_count >= ibmphp_get_total_controllers())
 875                                         break;
 876                                 pslot = list_entry (pslotlist, struct slot, ibm_slot_list);
 877                                 if (pslot->ctrl->ctlr_relative_id == ctrl_count) {
 878                                         ctrl_count++;
 879                                         if (READ_SLOT_LATCH (pslot->ctrl))
 880                                                 rc = ibmphp_hpc_readslot (pslot,
 881                                                                           READ_SLOTLATCHLOWREG,
 882                                                                           &curlatchlow);
 883                                 }
 884                         }
 885                         ++poll_count;
 886                         poll_state = POLL_SLEEP;
 887                         break;
 888                 case POLL_SLEEP:
 889                         /* don't sleep with a lock on the hardware */
 890                         up (&semOperations);
 891                         msleep(POLL_INTERVAL_SEC * 1000);
 892
 893                         if (kthread_should_stop())
 894                                 goto out_sleep;
 895
 896                         down (&semOperations);
 897
 898                         if (poll_count >= POLL_LATCH_CNT) {
 899                                 poll_count = 0;
 900                                 poll_state = POLL_SLOTS;
 901                         } else
 902                                 poll_state = POLL_LATCH_REGISTER;
 903                         break;
 904                 }
 905                 /* give up the hardware semaphore */
 906                 up (&semOperations);
 907                 /* sleep for a short time just for good measure */
 908 out_sleep:
 909                 msleep(100);
 910         }
 911         up (&sem_exit);
 912         debug ("%s - Exit\n", __func__);
 913         return 0;
 914 }
 915
 916
 917 /*----------------------------------------------------------------------
 918 * Name:    process_changeinstatus
 919 *
 920 * Action:  compare old and new slot status, process the change in status
 921 *
 922 * Input:   pointer to slot struct, old slot struct
 923 *
 924 * Return   0 or error codes
 925 * Value:
 926 *
 927 * Side
 928 * Effects: None.
 929 *
 930 * Notes:
 931 *---------------------------------------------------------------------*/
 932 static int process_changeinstatus (struct slot *pslot, struct slot *poldslot)
 933 {
 934         u8 status;
 935         int rc = 0;
 936         u8 disable = 0;
 937         u8 update = 0;
 938
 939         debug ("process_changeinstatus - Entry pslot[%p], poldslot[%p]\n", pslot, poldslot);
 940
 941         // bit 0 - HPC_SLOT_POWER
 942         if ((pslot->status & 0x01) != (poldslot->status & 0x01))
 943                 update = 1;
 944
 945         // bit 1 - HPC_SLOT_CONNECT
 946         // ignore
 947
 948         // bit 2 - HPC_SLOT_ATTN
 949         if ((pslot->status & 0x04) != (poldslot->status & 0x04))
 950                 update = 1;
 951
 952         // bit 3 - HPC_SLOT_PRSNT2
 953         // bit 4 - HPC_SLOT_PRSNT1
 954         if (((pslot->status & 0x08) != (poldslot->status & 0x08))
 955                 || ((pslot->status & 0x10) != (poldslot->status & 0x10)))
 956                 update = 1;
 957
 958         // bit 5 - HPC_SLOT_PWRGD
 959         if ((pslot->status & 0x20) != (poldslot->status & 0x20))
 960                 // OFF -> ON: ignore, ON -> OFF: disable slot
 961                 if ((poldslot->status & 0x20) && (SLOT_CONNECT (poldslot->status) == HPC_SLOT_CONNECTED) && (SLOT_PRESENT (poldslot->status)))
 962                         disable = 1;
 963
 964         // bit 6 - HPC_SLOT_BUS_SPEED
 965         // ignore
 966
 967         // bit 7 - HPC_SLOT_LATCH
 968         if ((pslot->status & 0x80) != (poldslot->status & 0x80)) {
 969                 update = 1;
 970                 // OPEN -> CLOSE
 971                 if (pslot->status & 0x80) {
 972                         if (SLOT_PWRGD (pslot->status)) {
 973                                 // power goes on and off after closing latch
 974                                 // check again to make sure power is still ON
 975                                 msleep(1000);
 976                                 rc = ibmphp_hpc_readslot (pslot, READ_SLOTSTATUS, &status);
 977                                 if (SLOT_PWRGD (status))
 978                                         update = 1;
 979                                 else    // overwrite power in pslot to OFF
 980                                         pslot->status &= ~HPC_SLOT_POWER;
 981                         }
 982                 }
 983                 // CLOSE -> OPEN
 984                 else if ((SLOT_PWRGD (poldslot->status) == HPC_SLOT_PWRGD_GOOD)
 985                         && (SLOT_CONNECT (poldslot->status) == HPC_SLOT_CONNECTED) && (SLOT_PRESENT (poldslot->status))) {
 986                         disable = 1;
 987                 }
 988                 // else - ignore
 989         }
 990         // bit 4 - HPC_SLOT_BLINK_ATTN
 991         if ((pslot->ext_status & 0x08) != (poldslot->ext_status & 0x08))
 992                 update = 1;
 993
 994         if (disable) {
 995                 debug ("process_changeinstatus - disable slot\n");
 996                 pslot->flag = 0;
 997                 rc = ibmphp_do_disable_slot (pslot);
 998         }
 999
1000         if (update || disable) {
1001                 ibmphp_update_slot_info (pslot);
1002         }
1003
1004         debug ("%s - Exit rc[%d] disable[%x] update[%x]\n", __func__, rc, disable, update);
1005
1006         return rc;
1007 }
1008
1009 /*----------------------------------------------------------------------
1010 * Name:    process_changeinlatch
1011 *
1012 * Action:  compare old and new latch reg status, process the change
1013 *
1014 * Input:   old and current latch register status
1015 *
1016 * Return   0 or error codes
1017 * Value:
1018 *---------------------------------------------------------------------*/
1019 static int process_changeinlatch (u8 old, u8 new, struct controller *ctrl)
1020 {
1021         struct slot myslot, *pslot;
1022         u8 i;
1023         u8 mask;
1024         int rc = 0;
1025
1026         debug ("%s - Entry old[%x], new[%x]\n", __func__, old, new);
1027         // bit 0 reserved, 0 is LSB, check bit 1-6 for 6 slots
1028
1029         for (i = ctrl->starting_slot_num; i <= ctrl->ending_slot_num; i++) {
1030                 mask = 0x01 << i;
1031                 if ((mask & old) != (mask & new)) {
1032                         pslot = ibmphp_get_slot_from_physical_num (i);
1033                         if (pslot) {
1034                                 memcpy ((void *) &myslot, (void *) pslot, sizeof (struct slot));
1035                                 rc = ibmphp_hpc_readslot (pslot, READ_ALLSTAT, NULL);
1036                                 debug ("%s - call process_changeinstatus for slot[%d]\n", __func__, i);
1037                                 process_changeinstatus (pslot, &myslot);
1038                         } else {
1039                                 rc = -EINVAL;
1040                                 err ("%s - Error bad pointer for slot[%d]\n", __func__, i);
1041                         }
1042                 }
1043         }
1044         debug ("%s - Exit rc[%d]\n", __func__, rc);
1045         return rc;
1046 }
1047
1048 /*----------------------------------------------------------------------
1049 * Name:    ibmphp_hpc_start_poll_thread
1050 *
1051 * Action:  start polling thread
1052 *---------------------------------------------------------------------*/
1053 int __init ibmphp_hpc_start_poll_thread (void)
1054 {
1055         debug ("%s - Entry\n", __func__);
1056
1057         ibmphp_poll_thread = kthread_run(poll_hpc, NULL, "hpc_poll");
1058         if (IS_ERR(ibmphp_poll_thread)) {
1059                 err ("%s - Error, thread not started\n", __func__);
1060                 return PTR_ERR(ibmphp_poll_thread);
1061         }
1062         return 0;
1063 }
1064
1065 /*----------------------------------------------------------------------
1066 * Name:    ibmphp_hpc_stop_poll_thread
1067 *
1068 * Action:  stop polling thread and cleanup
1069 *---------------------------------------------------------------------*/
1070 void __exit ibmphp_hpc_stop_poll_thread (void)
1071 {
1072         debug ("%s - Entry\n", __func__);
1073
1074         kthread_stop(ibmphp_poll_thread);
1075         debug ("before locking operations \n");
1076         ibmphp_lock_operations ();
1077         debug ("after locking operations \n");
1078
1079         // wait for poll thread to exit
1080         debug ("before sem_exit down \n");
1081         down (&sem_exit);
1082         debug ("after sem_exit down \n");
1083
1084         // cleanup
1085         debug ("before free_hpc_access \n");
1086         free_hpc_access ();
1087         debug ("after free_hpc_access \n");
1088         ibmphp_unlock_operations ();
1089         debug ("after unlock operations \n");
1090         up (&sem_exit);
1091         debug ("after sem exit up\n");
1092
1093         debug ("%s - Exit\n", __func__);
1094 }
1095
1096 /*----------------------------------------------------------------------
1097 * Name:    hpc_wait_ctlr_notworking
1098 *
1099 * Action:  wait until the controller is in a not working state
1100 *
1101 * Return   0, HPC_ERROR
1102 * Value:
1103 *---------------------------------------------------------------------*/
1104 static int hpc_wait_ctlr_notworking (int timeout, struct controller *ctlr_ptr, void __iomem *wpg_bbar,
1105                                     u8 * pstatus)
1106 {
1107         int rc = 0;
1108         u8 done = 0;
1109
1110         debug_polling ("hpc_wait_ctlr_notworking - Entry timeout[%d]\n", timeout);
1111
1112         while (!done) {
1113                 *pstatus = ctrl_read (ctlr_ptr, wpg_bbar, WPG_CTLR_INDEX);
1114                 if (*pstatus == HPC_ERROR) {
1115                         rc = HPC_ERROR;
1116                         done = 1;
1117                 }
1118                 if (CTLR_WORKING (*pstatus) == HPC_CTLR_WORKING_NO)
1119                         done = 1;
1120                 if (!done) {
1121                         msleep(1000);
1122                         if (timeout < 1) {
1123                                 done = 1;
1124                                 err ("HPCreadslot - Error ctlr timeout\n");
1125                                 rc = HPC_ERROR;
1126                         } else
1127                                 timeout--;
1128                 }
1129         }
1130         debug_polling ("hpc_wait_ctlr_notworking - Exit rc[%x] status[%x]\n", rc, *pstatus);
1131         return rc;
1132 }