drivers/i2c/busses/i2c-i801.c

   1 /*
   2     Copyright (c) 1998 - 2002  Frodo Looijaard <frodol@dds.nl>,
   3     Philip Edelbrock <phil@netroedge.com>, and Mark D. Studebaker
   4     <mdsxyz123@yahoo.com>
   5     Copyright (C) 2007 - 2014  Jean Delvare <jdelvare@suse.de>
   6     Copyright (C) 2010         Intel Corporation,
   7                                David Woodhouse <dwmw2@infradead.org>
   8
   9     This program is free software; you can redistribute it and/or modify
  10     it under the terms of the GNU General Public License as published by
  11     the Free Software Foundation; either version 2 of the License, or
  12     (at your option) any later version.
  13
  14     This program is distributed in the hope that it will be useful,
  15     but WITHOUT ANY WARRANTY; without even the implied warranty of
  16     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17     GNU General Public License for more details.
  18 */
  19
  20 /*
  21  * Supports the following Intel I/O Controller Hubs (ICH):
  22  *
  23  *                                      I/O                     Block   I2C
  24  *                                      region  SMBus   Block   proc.   block
  25  * Chip name                    PCI ID  size    PEC     buffer  call    read
  26  * ---------------------------------------------------------------------------
  27  * 82801AA (ICH)                0x2413  16      no      no      no      no
  28  * 82801AB (ICH0)               0x2423  16      no      no      no      no
  29  * 82801BA (ICH2)               0x2443  16      no      no      no      no
  30  * 82801CA (ICH3)               0x2483  32      soft    no      no      no
  31  * 82801DB (ICH4)               0x24c3  32      hard    yes     no      no
  32  * 82801E (ICH5)                0x24d3  32      hard    yes     yes     yes
  33  * 6300ESB                      0x25a4  32      hard    yes     yes     yes
  34  * 82801F (ICH6)                0x266a  32      hard    yes     yes     yes
  35  * 6310ESB/6320ESB              0x269b  32      hard    yes     yes     yes
  36  * 82801G (ICH7)                0x27da  32      hard    yes     yes     yes
  37  * 82801H (ICH8)                0x283e  32      hard    yes     yes     yes
  38  * 82801I (ICH9)                0x2930  32      hard    yes     yes     yes
  39  * EP80579 (Tolapai)            0x5032  32      hard    yes     yes     yes
  40  * ICH10                        0x3a30  32      hard    yes     yes     yes
  41  * ICH10                        0x3a60  32      hard    yes     yes     yes
  42  * 5/3400 Series (PCH)          0x3b30  32      hard    yes     yes     yes
  43  * 6 Series (PCH)               0x1c22  32      hard    yes     yes     yes
  44  * Patsburg (PCH)               0x1d22  32      hard    yes     yes     yes
  45  * Patsburg (PCH) IDF           0x1d70  32      hard    yes     yes     yes
  46  * Patsburg (PCH) IDF           0x1d71  32      hard    yes     yes     yes
  47  * Patsburg (PCH) IDF           0x1d72  32      hard    yes     yes     yes
  48  * DH89xxCC (PCH)               0x2330  32      hard    yes     yes     yes
  49  * Panther Point (PCH)          0x1e22  32      hard    yes     yes     yes
  50  * Lynx Point (PCH)             0x8c22  32      hard    yes     yes     yes
  51  * Lynx Point-LP (PCH)          0x9c22  32      hard    yes     yes     yes
  52  * Avoton (SOC)                 0x1f3c  32      hard    yes     yes     yes
  53  * Wellsburg (PCH)              0x8d22  32      hard    yes     yes     yes
  54  * Wellsburg (PCH) MS           0x8d7d  32      hard    yes     yes     yes
  55  * Wellsburg (PCH) MS           0x8d7e  32      hard    yes     yes     yes
  56  * Wellsburg (PCH) MS           0x8d7f  32      hard    yes     yes     yes
  57  * Coleto Creek (PCH)           0x23b0  32      hard    yes     yes     yes
  58  * Wildcat Point (PCH)          0x8ca2  32      hard    yes     yes     yes
  59  * Wildcat Point-LP (PCH)       0x9ca2  32      hard    yes     yes     yes
  60  * BayTrail (SOC)               0x0f12  32      hard    yes     yes     yes
  61  * Sunrise Point-H (PCH)        0xa123  32      hard    yes     yes     yes
  62  * Sunrise Point-LP (PCH)       0x9d23  32      hard    yes     yes     yes
  63  * DNV (SOC)                    0x19df  32      hard    yes     yes     yes
  64  * Broxton (SOC)                0x5ad4  32      hard    yes     yes     yes
  65  * Lewisburg (PCH)              0xa1a3  32      hard    yes     yes     yes
  66  * Lewisburg Supersku (PCH)     0xa223  32      hard    yes     yes     yes
  67  *
  68  * Features supported by this driver:
  69  * Software PEC                         no
  70  * Hardware PEC                         yes
  71  * Block buffer                         yes
  72  * Block process call transaction       no
  73  * I2C block read transaction           yes (doesn't use the block buffer)
  74  * Slave mode                           no
  75  * SMBus Host Notify                    yes
  76  * Interrupt processing                 yes
  77  *
  78  * See the file Documentation/i2c/busses/i2c-i801 for details.
  79  */
  80
  81 #include <linux/interrupt.h>
  82 #include <linux/module.h>
  83 #include <linux/pci.h>
  84 #include <linux/kernel.h>
  85 #include <linux/stddef.h>
  86 #include <linux/delay.h>
  87 #include <linux/ioport.h>
  88 #include <linux/init.h>
  89 #include <linux/i2c.h>
  90 #include <linux/i2c-smbus.h>
  91 #include <linux/acpi.h>
  92 #include <linux/io.h>
  93 #include <linux/dmi.h>
  94 #include <linux/slab.h>
  95 #include <linux/wait.h>
  96 #include <linux/err.h>
  97 #include <linux/platform_device.h>
  98 #include <linux/platform_data/itco_wdt.h>
  99 #include <linux/pm_runtime.h>
 100
 101 #if IS_ENABLED(CONFIG_I2C_MUX_GPIO) && defined CONFIG_DMI
 102 #include <linux/gpio.h>
 103 #include <linux/i2c-mux-gpio.h>
 104 #endif
 105
 106 /* I801 SMBus address offsets */
 107 #define SMBHSTSTS(p)    (0 + (p)->smba)
 108 #define SMBHSTCNT(p)    (2 + (p)->smba)
 109 #define SMBHSTCMD(p)    (3 + (p)->smba)
 110 #define SMBHSTADD(p)    (4 + (p)->smba)
 111 #define SMBHSTDAT0(p)   (5 + (p)->smba)
 112 #define SMBHSTDAT1(p)   (6 + (p)->smba)
 113 #define SMBBLKDAT(p)    (7 + (p)->smba)
 114 #define SMBPEC(p)       (8 + (p)->smba)         /* ICH3 and later */
 115 #define SMBAUXSTS(p)    (12 + (p)->smba)        /* ICH4 and later */
 116 #define SMBAUXCTL(p)    (13 + (p)->smba)        /* ICH4 and later */
 117 #define SMBSLVSTS(p)    (16 + (p)->smba)        /* ICH3 and later */
 118 #define SMBSLVCMD(p)    (17 + (p)->smba)        /* ICH3 and later */
 119 #define SMBNTFDADD(p)   (20 + (p)->smba)        /* ICH3 and later */
 120 #define SMBNTFDDAT(p)   (22 + (p)->smba)        /* ICH3 and later */
 121
 122 /* PCI Address Constants */
 123 #define SMBBAR          4
 124 #define SMBPCICTL       0x004
 125 #define SMBPCISTS       0x006
 126 #define SMBHSTCFG       0x040
 127 #define TCOBASE         0x050
 128 #define TCOCTL          0x054
 129
 130 #define ACPIBASE                0x040
 131 #define ACPIBASE_SMI_OFF        0x030
 132 #define ACPICTRL                0x044
 133 #define ACPICTRL_EN             0x080
 134
 135 #define SBREG_BAR               0x10
 136 #define SBREG_SMBCTRL           0xc6000c
 137
 138 /* Host status bits for SMBPCISTS */
 139 #define SMBPCISTS_INTS          0x08
 140
 141 /* Control bits for SMBPCICTL */
 142 #define SMBPCICTL_INTDIS        0x0400
 143
 144 /* Host configuration bits for SMBHSTCFG */
 145 #define SMBHSTCFG_HST_EN        1
 146 #define SMBHSTCFG_SMB_SMI_EN    2
 147 #define SMBHSTCFG_I2C_EN        4
 148
 149 /* TCO configuration bits for TCOCTL */
 150 #define TCOCTL_EN               0x0100
 151
 152 /* Auxiliary status register bits, ICH4+ only */
 153 #define SMBAUXSTS_CRCE          1
 154 #define SMBAUXSTS_STCO          2
 155
 156 /* Auxiliary control register bits, ICH4+ only */
 157 #define SMBAUXCTL_CRC           1
 158 #define SMBAUXCTL_E32B          2
 159
 160 /* Other settings */
 161 #define MAX_RETRIES             400
 162
 163 /* I801 command constants */
 164 #define I801_QUICK              0x00
 165 #define I801_BYTE               0x04
 166 #define I801_BYTE_DATA          0x08
 167 #define I801_WORD_DATA          0x0C
 168 #define I801_PROC_CALL          0x10    /* unimplemented */
 169 #define I801_BLOCK_DATA         0x14
 170 #define I801_I2C_BLOCK_DATA     0x18    /* ICH5 and later */
 171
 172 /* I801 Host Control register bits */
 173 #define SMBHSTCNT_INTREN        0x01
 174 #define SMBHSTCNT_KILL          0x02
 175 #define SMBHSTCNT_LAST_BYTE     0x20
 176 #define SMBHSTCNT_START         0x40
 177 #define SMBHSTCNT_PEC_EN        0x80    /* ICH3 and later */
 178
 179 /* I801 Hosts Status register bits */
 180 #define SMBHSTSTS_BYTE_DONE     0x80
 181 #define SMBHSTSTS_INUSE_STS     0x40
 182 #define SMBHSTSTS_SMBALERT_STS  0x20
 183 #define SMBHSTSTS_FAILED        0x10
 184 #define SMBHSTSTS_BUS_ERR       0x08
 185 #define SMBHSTSTS_DEV_ERR       0x04
 186 #define SMBHSTSTS_INTR          0x02
 187 #define SMBHSTSTS_HOST_BUSY     0x01
 188
 189 /* Host Notify Status registers bits */
 190 #define SMBSLVSTS_HST_NTFY_STS  1
 191
 192 /* Host Notify Command registers bits */
 193 #define SMBSLVCMD_HST_NTFY_INTREN       0x01
 194
 195 #define STATUS_ERROR_FLAGS      (SMBHSTSTS_FAILED | SMBHSTSTS_BUS_ERR | \
 196                                  SMBHSTSTS_DEV_ERR)
 197
 198 #define STATUS_FLAGS            (SMBHSTSTS_BYTE_DONE | SMBHSTSTS_INTR | \
 199                                  STATUS_ERROR_FLAGS)
 200
 201 /* Older devices have their ID defined in <linux/pci_ids.h> */
 202 #define PCI_DEVICE_ID_INTEL_BAYTRAIL_SMBUS              0x0f12
 203 #define PCI_DEVICE_ID_INTEL_DNV_SMBUS                   0x19df
 204 #define PCI_DEVICE_ID_INTEL_COUGARPOINT_SMBUS           0x1c22
 205 #define PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS              0x1d22
 206 /* Patsburg also has three 'Integrated Device Function' SMBus controllers */
 207 #define PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF0         0x1d70
 208 #define PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF1         0x1d71
 209 #define PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF2         0x1d72
 210 #define PCI_DEVICE_ID_INTEL_PANTHERPOINT_SMBUS          0x1e22
 211 #define PCI_DEVICE_ID_INTEL_AVOTON_SMBUS                0x1f3c
 212 #define PCI_DEVICE_ID_INTEL_BRASWELL_SMBUS              0x2292
 213 #define PCI_DEVICE_ID_INTEL_DH89XXCC_SMBUS              0x2330
 214 #define PCI_DEVICE_ID_INTEL_COLETOCREEK_SMBUS           0x23b0
 215 #define PCI_DEVICE_ID_INTEL_5_3400_SERIES_SMBUS         0x3b30
 216 #define PCI_DEVICE_ID_INTEL_BROXTON_SMBUS               0x5ad4
 217 #define PCI_DEVICE_ID_INTEL_LYNXPOINT_SMBUS             0x8c22
 218 #define PCI_DEVICE_ID_INTEL_WILDCATPOINT_SMBUS          0x8ca2
 219 #define PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS             0x8d22
 220 #define PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS0         0x8d7d
 221 #define PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS1         0x8d7e
 222 #define PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS2         0x8d7f
 223 #define PCI_DEVICE_ID_INTEL_LYNXPOINT_LP_SMBUS          0x9c22
 224 #define PCI_DEVICE_ID_INTEL_WILDCATPOINT_LP_SMBUS       0x9ca2
 225 #define PCI_DEVICE_ID_INTEL_SUNRISEPOINT_LP_SMBUS       0x9d23
 226 #define PCI_DEVICE_ID_INTEL_SUNRISEPOINT_H_SMBUS        0xa123
 227 #define PCI_DEVICE_ID_INTEL_LEWISBURG_SMBUS             0xa1a3
 228 #define PCI_DEVICE_ID_INTEL_LEWISBURG_SSKU_SMBUS        0xa223
 229
 230 struct i801_mux_config {
 231         char *gpio_chip;
 232         unsigned values[3];
 233         int n_values;
 234         unsigned classes[3];
 235         unsigned gpios[2];              /* Relative to gpio_chip->base */
 236         int n_gpios;
 237 };
 238
 239 struct i801_priv {
 240         struct i2c_adapter adapter;
 241         unsigned long smba;
 242         unsigned char original_hstcfg;
 243         struct pci_dev *pci_dev;
 244         unsigned int features;
 245
 246         /* isr processing */
 247         wait_queue_head_t waitq;
 248         u8 status;
 249
 250         /* Command state used by isr for byte-by-byte block transactions */
 251         u8 cmd;
 252         bool is_read;
 253         int count;
 254         int len;
 255         u8 *data;
 256
 257 #if IS_ENABLED(CONFIG_I2C_MUX_GPIO) && defined CONFIG_DMI
 258         const struct i801_mux_config *mux_drvdata;
 259         struct platform_device *mux_pdev;
 260 #endif
 261         struct platform_device *tco_pdev;
 262
 263         /*
 264          * If set to true the host controller registers are reserved for
 265          * ACPI AML use. Protected by acpi_lock.
 266          */
 267         bool acpi_reserved;
 268         struct mutex acpi_lock;
 269         struct smbus_host_notify *host_notify;
 270 };
 271
 272 #define SMBHSTNTFY_SIZE         8
 273
 274 #define FEATURE_SMBUS_PEC       (1 << 0)
 275 #define FEATURE_BLOCK_BUFFER    (1 << 1)
 276 #define FEATURE_BLOCK_PROC      (1 << 2)
 277 #define FEATURE_I2C_BLOCK_READ  (1 << 3)
 278 #define FEATURE_IRQ             (1 << 4)
 279 #define FEATURE_HOST_NOTIFY     (1 << 5)
 280 /* Not really a feature, but it's convenient to handle it as such */
 281 #define FEATURE_IDF             (1 << 15)
 282 #define FEATURE_TCO             (1 << 16)
 283
 284 static const char *i801_feature_names[] = {
 285         "SMBus PEC",
 286         "Block buffer",
 287         "Block process call",
 288         "I2C block read",
 289         "Interrupt",
 290         "SMBus Host Notify",
 291 };
 292
 293 static unsigned int disable_features;
 294 module_param(disable_features, uint, S_IRUGO | S_IWUSR);
 295 MODULE_PARM_DESC(disable_features, "Disable selected driver features:\n"
 296         "\t\t  0x01  disable SMBus PEC\n"
 297         "\t\t  0x02  disable the block buffer\n"
 298         "\t\t  0x08  disable the I2C block read functionality\n"
 299         "\t\t  0x10  don't use interrupts\n"
 300         "\t\t  0x20  disable SMBus Host Notify ");
 301
 302 /* Make sure the SMBus host is ready to start transmitting.
 303    Return 0 if it is, -EBUSY if it is not. */
 304 static int i801_check_pre(struct i801_priv *priv)
 305 {
 306         int status;
 307
 308         status = inb_p(SMBHSTSTS(priv));
 309         if (status & SMBHSTSTS_HOST_BUSY) {
 310                 dev_err(&priv->pci_dev->dev, "SMBus is busy, can't use it!\n");
 311                 return -EBUSY;
 312         }
 313
 314         status &= STATUS_FLAGS;
 315         if (status) {
 316                 dev_dbg(&priv->pci_dev->dev, "Clearing status flags (%02x)\n",
 317                         status);
 318                 outb_p(status, SMBHSTSTS(priv));
 319                 status = inb_p(SMBHSTSTS(priv)) & STATUS_FLAGS;
 320                 if (status) {
 321                         dev_err(&priv->pci_dev->dev,
 322                                 "Failed clearing status flags (%02x)\n",
 323                                 status);
 324                         return -EBUSY;
 325                 }
 326         }
 327
 328         /*
 329          * Clear CRC status if needed.
 330          * During normal operation, i801_check_post() takes care
 331          * of it after every operation.  We do it here only in case
 332          * the hardware was already in this state when the driver
 333          * started.
 334          */
 335         if (priv->features & FEATURE_SMBUS_PEC) {
 336                 status = inb_p(SMBAUXSTS(priv)) & SMBAUXSTS_CRCE;
 337                 if (status) {
 338                         dev_dbg(&priv->pci_dev->dev,
 339                                 "Clearing aux status flags (%02x)\n", status);
 340                         outb_p(status, SMBAUXSTS(priv));
 341                         status = inb_p(SMBAUXSTS(priv)) & SMBAUXSTS_CRCE;
 342                         if (status) {
 343                                 dev_err(&priv->pci_dev->dev,
 344                                         "Failed clearing aux status flags (%02x)\n",
 345                                         status);
 346                                 return -EBUSY;
 347                         }
 348                 }
 349         }
 350
 351         return 0;
 352 }
 353
 354 /*
 355  * Convert the status register to an error code, and clear it.
 356  * Note that status only contains the bits we want to clear, not the
 357  * actual register value.
 358  */
 359 static int i801_check_post(struct i801_priv *priv, int status)
 360 {
 361         int result = 0;
 362
 363         /*
 364          * If the SMBus is still busy, we give up
 365          * Note: This timeout condition only happens when using polling
 366          * transactions.  For interrupt operation, NAK/timeout is indicated by
 367          * DEV_ERR.
 368          */
 369         if (unlikely(status < 0)) {
 370                 dev_err(&priv->pci_dev->dev, "Transaction timeout\n");
 371                 /* try to stop the current command */
 372                 dev_dbg(&priv->pci_dev->dev, "Terminating the current operation\n");
 373                 outb_p(inb_p(SMBHSTCNT(priv)) | SMBHSTCNT_KILL,
 374                        SMBHSTCNT(priv));
 375                 usleep_range(1000, 2000);
 376                 outb_p(inb_p(SMBHSTCNT(priv)) & (~SMBHSTCNT_KILL),
 377                        SMBHSTCNT(priv));
 378
 379                 /* Check if it worked */
 380                 status = inb_p(SMBHSTSTS(priv));
 381                 if ((status & SMBHSTSTS_HOST_BUSY) ||
 382                     !(status & SMBHSTSTS_FAILED))
 383                         dev_err(&priv->pci_dev->dev,
 384                                 "Failed terminating the transaction\n");
 385                 outb_p(STATUS_FLAGS, SMBHSTSTS(priv));
 386                 return -ETIMEDOUT;
 387         }
 388
 389         if (status & SMBHSTSTS_FAILED) {
 390                 result = -EIO;
 391                 dev_err(&priv->pci_dev->dev, "Transaction failed\n");
 392         }
 393         if (status & SMBHSTSTS_DEV_ERR) {
 394                 /*
 395                  * This may be a PEC error, check and clear it.
 396                  *
 397                  * AUXSTS is handled differently from HSTSTS.
 398                  * For HSTSTS, i801_isr() or i801_wait_intr()
 399                  * has already cleared the error bits in hardware,
 400                  * and we are passed a copy of the original value
 401                  * in "status".
 402                  * For AUXSTS, the hardware register is left
 403                  * for us to handle here.
 404                  * This is asymmetric, slightly iffy, but safe,
 405                  * since all this code is serialized and the CRCE
 406                  * bit is harmless as long as it's cleared before
 407                  * the next operation.
 408                  */
 409                 if ((priv->features & FEATURE_SMBUS_PEC) &&
 410                     (inb_p(SMBAUXSTS(priv)) & SMBAUXSTS_CRCE)) {
 411                         outb_p(SMBAUXSTS_CRCE, SMBAUXSTS(priv));
 412                         result = -EBADMSG;
 413                         dev_dbg(&priv->pci_dev->dev, "PEC error\n");
 414                 } else {
 415                         result = -ENXIO;
 416                         dev_dbg(&priv->pci_dev->dev, "No response\n");
 417                 }
 418         }
 419         if (status & SMBHSTSTS_BUS_ERR) {
 420                 result = -EAGAIN;
 421                 dev_dbg(&priv->pci_dev->dev, "Lost arbitration\n");
 422         }
 423
 424         /* Clear status flags except BYTE_DONE, to be cleared by caller */
 425         outb_p(status, SMBHSTSTS(priv));
 426
 427         return result;
 428 }
 429
 430 /* Wait for BUSY being cleared and either INTR or an error flag being set */
 431 static int i801_wait_intr(struct i801_priv *priv)
 432 {
 433         int timeout = 0;
 434         int status;
 435
 436         /* We will always wait for a fraction of a second! */
 437         do {
 438                 usleep_range(250, 500);
 439                 status = inb_p(SMBHSTSTS(priv));
 440         } while (((status & SMBHSTSTS_HOST_BUSY) ||
 441                   !(status & (STATUS_ERROR_FLAGS | SMBHSTSTS_INTR))) &&
 442                  (timeout++ < MAX_RETRIES));
 443
 444         if (timeout > MAX_RETRIES) {
 445                 dev_dbg(&priv->pci_dev->dev, "INTR Timeout!\n");
 446                 return -ETIMEDOUT;
 447         }
 448         return status & (STATUS_ERROR_FLAGS | SMBHSTSTS_INTR);
 449 }
 450
 451 /* Wait for either BYTE_DONE or an error flag being set */
 452 static int i801_wait_byte_done(struct i801_priv *priv)
 453 {
 454         int timeout = 0;
 455         int status;
 456
 457         /* We will always wait for a fraction of a second! */
 458         do {
 459                 usleep_range(250, 500);
 460                 status = inb_p(SMBHSTSTS(priv));
 461         } while (!(status & (STATUS_ERROR_FLAGS | SMBHSTSTS_BYTE_DONE)) &&
 462                  (timeout++ < MAX_RETRIES));
 463
 464         if (timeout > MAX_RETRIES) {
 465                 dev_dbg(&priv->pci_dev->dev, "BYTE_DONE Timeout!\n");
 466                 return -ETIMEDOUT;
 467         }
 468         return status & STATUS_ERROR_FLAGS;
 469 }
 470
 471 static int i801_transaction(struct i801_priv *priv, int xact)
 472 {
 473         int status;
 474         int result;
 475         const struct i2c_adapter *adap = &priv->adapter;
 476
 477         result = i801_check_pre(priv);
 478         if (result < 0)
 479                 return result;
 480
 481         if (priv->features & FEATURE_IRQ) {
 482                 outb_p(xact | SMBHSTCNT_INTREN | SMBHSTCNT_START,
 483                        SMBHSTCNT(priv));
 484                 result = wait_event_timeout(priv->waitq,
 485                                             (status = priv->status),
 486                                             adap->timeout);
 487                 if (!result) {
 488                         status = -ETIMEDOUT;
 489                         dev_warn(&priv->pci_dev->dev,
 490                                  "Timeout waiting for interrupt!\n");
 491                 }
 492                 priv->status = 0;
 493                 return i801_check_post(priv, status);
 494         }
 495
 496         /* the current contents of SMBHSTCNT can be overwritten, since PEC,
 497          * SMBSCMD are passed in xact */
 498         outb_p(xact | SMBHSTCNT_START, SMBHSTCNT(priv));
 499
 500         status = i801_wait_intr(priv);
 501         return i801_check_post(priv, status);
 502 }
 503
 504 static int i801_block_transaction_by_block(struct i801_priv *priv,
 505                                            union i2c_smbus_data *data,
 506                                            char read_write, int hwpec)
 507 {
 508         int i, len;
 509         int status;
 510
 511         inb_p(SMBHSTCNT(priv)); /* reset the data buffer index */
 512
 513         /* Use 32-byte buffer to process this transaction */
 514         if (read_write == I2C_SMBUS_WRITE) {
 515                 len = data->block[0];
 516                 outb_p(len, SMBHSTDAT0(priv));
 517                 for (i = 0; i < len; i++)
 518                         outb_p(data->block[i+1], SMBBLKDAT(priv));
 519         }
 520
 521         status = i801_transaction(priv, I801_BLOCK_DATA |
 522                                   (hwpec ? SMBHSTCNT_PEC_EN : 0));
 523         if (status)
 524                 return status;
 525
 526         if (read_write == I2C_SMBUS_READ) {
 527                 len = inb_p(SMBHSTDAT0(priv));
 528                 if (len < 1 || len > I2C_SMBUS_BLOCK_MAX)
 529                         return -EPROTO;
 530
 531                 data->block[0] = len;
 532                 for (i = 0; i < len; i++)
 533                         data->block[i + 1] = inb_p(SMBBLKDAT(priv));
 534         }
 535         return 0;
 536 }
 537
 538 static void i801_isr_byte_done(struct i801_priv *priv)
 539 {
 540         if (priv->is_read) {
 541                 /* For SMBus block reads, length is received with first byte */
 542                 if (((priv->cmd & 0x1c) == I801_BLOCK_DATA) &&
 543                     (priv->count == 0)) {
 544                         priv->len = inb_p(SMBHSTDAT0(priv));
 545                         if (priv->len < 1 || priv->len > I2C_SMBUS_BLOCK_MAX) {
 546                                 dev_err(&priv->pci_dev->dev,
 547                                         "Illegal SMBus block read size %d\n",
 548                                         priv->len);
 549                                 /* FIXME: Recover */
 550                                 priv->len = I2C_SMBUS_BLOCK_MAX;
 551                         } else {
 552                                 dev_dbg(&priv->pci_dev->dev,
 553                                         "SMBus block read size is %d\n",
 554                                         priv->len);
 555                         }
 556                         priv->data[-1] = priv->len;
 557                 }
 558
 559                 /* Read next byte */
 560                 if (priv->count < priv->len)
 561                         priv->data[priv->count++] = inb(SMBBLKDAT(priv));
 562                 else
 563                         dev_dbg(&priv->pci_dev->dev,
 564                                 "Discarding extra byte on block read\n");
 565
 566                 /* Set LAST_BYTE for last byte of read transaction */
 567                 if (priv->count == priv->len - 1)
 568                         outb_p(priv->cmd | SMBHSTCNT_LAST_BYTE,
 569                                SMBHSTCNT(priv));
 570         } else if (priv->count < priv->len - 1) {
 571                 /* Write next byte, except for IRQ after last byte */
 572                 outb_p(priv->data[++priv->count], SMBBLKDAT(priv));
 573         }
 574
 575         /* Clear BYTE_DONE to continue with next byte */
 576         outb_p(SMBHSTSTS_BYTE_DONE, SMBHSTSTS(priv));
 577 }
 578
 579 static irqreturn_t i801_host_notify_isr(struct i801_priv *priv)
 580 {
 581         unsigned short addr;
 582         unsigned int data;
 583
 584         addr = inb_p(SMBNTFDADD(priv)) >> 1;
 585         data = inw_p(SMBNTFDDAT(priv));
 586
 587         i2c_handle_smbus_host_notify(priv->host_notify, addr, data);
 588
 589         /* clear Host Notify bit and return */
 590         outb_p(SMBSLVSTS_HST_NTFY_STS, SMBSLVSTS(priv));
 591         return IRQ_HANDLED;
 592 }
 593
 594 /*
 595  * There are three kinds of interrupts:
 596  *
 597  * 1) i801 signals transaction completion with one of these interrupts:
 598  *      INTR - Success
 599  *      DEV_ERR - Invalid command, NAK or communication timeout
 600  *      BUS_ERR - SMI# transaction collision
 601  *      FAILED - transaction was canceled due to a KILL request
 602  *    When any of these occur, update ->status and wake up the waitq.
 603  *    ->status must be cleared before kicking off the next transaction.
 604  *
 605  * 2) For byte-by-byte (I2C read/write) transactions, one BYTE_DONE interrupt
 606  *    occurs for each byte of a byte-by-byte to prepare the next byte.
 607  *
 608  * 3) Host Notify interrupts
 609  */
 610 static irqreturn_t i801_isr(int irq, void *dev_id)
 611 {
 612         struct i801_priv *priv = dev_id;
 613         u16 pcists;
 614         u8 status;
 615
 616         /* Confirm this is our interrupt */
 617         pci_read_config_word(priv->pci_dev, SMBPCISTS, &pcists);
 618         if (!(pcists & SMBPCISTS_INTS))
 619                 return IRQ_NONE;
 620
 621         if (priv->features & FEATURE_HOST_NOTIFY) {
 622                 status = inb_p(SMBSLVSTS(priv));
 623                 if (status & SMBSLVSTS_HST_NTFY_STS)
 624                         return i801_host_notify_isr(priv);
 625         }
 626
 627         status = inb_p(SMBHSTSTS(priv));
 628         if (status & SMBHSTSTS_BYTE_DONE)
 629                 i801_isr_byte_done(priv);
 630
 631         /*
 632          * Clear irq sources and report transaction result.
 633          * ->status must be cleared before the next transaction is started.
 634          */
 635         status &= SMBHSTSTS_INTR | STATUS_ERROR_FLAGS;
 636         if (status) {
 637                 outb_p(status, SMBHSTSTS(priv));
 638                 priv->status = status;
 639                 wake_up(&priv->waitq);
 640         }
 641
 642         return IRQ_HANDLED;
 643 }
 644
 645 /*
 646  * For "byte-by-byte" block transactions:
 647  *   I2C write uses cmd=I801_BLOCK_DATA, I2C_EN=1
 648  *   I2C read uses cmd=I801_I2C_BLOCK_DATA
 649  */
 650 static int i801_block_transaction_byte_by_byte(struct i801_priv *priv,
 651                                                union i2c_smbus_data *data,
 652                                                char read_write, int command,
 653                                                int hwpec)
 654 {
 655         int i, len;
 656         int smbcmd;
 657         int status;
 658         int result;
 659         const struct i2c_adapter *adap = &priv->adapter;
 660
 661         result = i801_check_pre(priv);
 662         if (result < 0)
 663                 return result;
 664
 665         len = data->block[0];
 666
 667         if (read_write == I2C_SMBUS_WRITE) {
 668                 outb_p(len, SMBHSTDAT0(priv));
 669                 outb_p(data->block[1], SMBBLKDAT(priv));
 670         }
 671
 672         if (command == I2C_SMBUS_I2C_BLOCK_DATA &&
 673             read_write == I2C_SMBUS_READ)
 674                 smbcmd = I801_I2C_BLOCK_DATA;
 675         else
 676                 smbcmd = I801_BLOCK_DATA;
 677
 678         if (priv->features & FEATURE_IRQ) {
 679                 priv->is_read = (read_write == I2C_SMBUS_READ);
 680                 if (len == 1 && priv->is_read)
 681                         smbcmd |= SMBHSTCNT_LAST_BYTE;
 682                 priv->cmd = smbcmd | SMBHSTCNT_INTREN;
 683                 priv->len = len;
 684                 priv->count = 0;
 685                 priv->data = &data->block[1];
 686
 687                 outb_p(priv->cmd | SMBHSTCNT_START, SMBHSTCNT(priv));
 688                 result = wait_event_timeout(priv->waitq,
 689                                             (status = priv->status),
 690                                             adap->timeout);
 691                 if (!result) {
 692                         status = -ETIMEDOUT;
 693                         dev_warn(&priv->pci_dev->dev,
 694                                  "Timeout waiting for interrupt!\n");
 695                 }
 696                 priv->status = 0;
 697                 return i801_check_post(priv, status);
 698         }
 699
 700         for (i = 1; i <= len; i++) {
 701                 if (i == len && read_write == I2C_SMBUS_READ)
 702                         smbcmd |= SMBHSTCNT_LAST_BYTE;
 703                 outb_p(smbcmd, SMBHSTCNT(priv));
 704
 705                 if (i == 1)
 706                         outb_p(inb(SMBHSTCNT(priv)) | SMBHSTCNT_START,
 707                                SMBHSTCNT(priv));
 708
 709                 status = i801_wait_byte_done(priv);
 710                 if (status)
 711                         goto exit;
 712
 713                 if (i == 1 && read_write == I2C_SMBUS_READ
 714                  && command != I2C_SMBUS_I2C_BLOCK_DATA) {
 715                         len = inb_p(SMBHSTDAT0(priv));
 716                         if (len < 1 || len > I2C_SMBUS_BLOCK_MAX) {
 717                                 dev_err(&priv->pci_dev->dev,
 718                                         "Illegal SMBus block read size %d\n",
 719                                         len);
 720                                 /* Recover */
 721                                 while (inb_p(SMBHSTSTS(priv)) &
 722                                        SMBHSTSTS_HOST_BUSY)
 723                                         outb_p(SMBHSTSTS_BYTE_DONE,
 724                                                SMBHSTSTS(priv));
 725                                 outb_p(SMBHSTSTS_INTR, SMBHSTSTS(priv));
 726                                 return -EPROTO;
 727                         }
 728                         data->block[0] = len;
 729                 }
 730
 731                 /* Retrieve/store value in SMBBLKDAT */
 732                 if (read_write == I2C_SMBUS_READ)
 733                         data->block[i] = inb_p(SMBBLKDAT(priv));
 734                 if (read_write == I2C_SMBUS_WRITE && i+1 <= len)
 735                         outb_p(data->block[i+1], SMBBLKDAT(priv));
 736
 737                 /* signals SMBBLKDAT ready */
 738                 outb_p(SMBHSTSTS_BYTE_DONE, SMBHSTSTS(priv));
 739         }
 740
 741         status = i801_wait_intr(priv);
 742 exit:
 743         return i801_check_post(priv, status);
 744 }
 745
 746 static int i801_set_block_buffer_mode(struct i801_priv *priv)
 747 {
 748         outb_p(inb_p(SMBAUXCTL(priv)) | SMBAUXCTL_E32B, SMBAUXCTL(priv));
 749         if ((inb_p(SMBAUXCTL(priv)) & SMBAUXCTL_E32B) == 0)
 750                 return -EIO;
 751         return 0;
 752 }
 753
 754 /* Block transaction function */
 755 static int i801_block_transaction(struct i801_priv *priv,
 756                                   union i2c_smbus_data *data, char read_write,
 757                                   int command, int hwpec)
 758 {
 759         int result = 0;
 760         unsigned char hostc;
 761
 762         if (command == I2C_SMBUS_I2C_BLOCK_DATA) {
 763                 if (read_write == I2C_SMBUS_WRITE) {
 764                         /* set I2C_EN bit in configuration register */
 765                         pci_read_config_byte(priv->pci_dev, SMBHSTCFG, &hostc);
 766                         pci_write_config_byte(priv->pci_dev, SMBHSTCFG,
 767                                               hostc | SMBHSTCFG_I2C_EN);
 768                 } else if (!(priv->features & FEATURE_I2C_BLOCK_READ)) {
 769                         dev_err(&priv->pci_dev->dev,
 770                                 "I2C block read is unsupported!\n");
 771                         return -EOPNOTSUPP;
 772                 }
 773         }
 774
 775         if (read_write == I2C_SMBUS_WRITE
 776          || command == I2C_SMBUS_I2C_BLOCK_DATA) {
 777                 if (data->block[0] < 1)
 778                         data->block[0] = 1;
 779                 if (data->block[0] > I2C_SMBUS_BLOCK_MAX)
 780                         data->block[0] = I2C_SMBUS_BLOCK_MAX;
 781         } else {
 782                 data->block[0] = 32;    /* max for SMBus block reads */
 783         }
 784
 785         /* Experience has shown that the block buffer can only be used for
 786            SMBus (not I2C) block transactions, even though the datasheet
 787            doesn't mention this limitation. */
 788         if ((priv->features & FEATURE_BLOCK_BUFFER)
 789          && command != I2C_SMBUS_I2C_BLOCK_DATA
 790          && i801_set_block_buffer_mode(priv) == 0)
 791                 result = i801_block_transaction_by_block(priv, data,
 792                                                          read_write, hwpec);
 793         else
 794                 result = i801_block_transaction_byte_by_byte(priv, data,
 795                                                              read_write,
 796                                                              command, hwpec);
 797
 798         if (command == I2C_SMBUS_I2C_BLOCK_DATA
 799          && read_write == I2C_SMBUS_WRITE) {
 800                 /* restore saved configuration register value */
 801                 pci_write_config_byte(priv->pci_dev, SMBHSTCFG, hostc);
 802         }
 803         return result;
 804 }
 805
 806 /* Return negative errno on error. */
 807 static s32 i801_access(struct i2c_adapter *adap, u16 addr,
 808                        unsigned short flags, char read_write, u8 command,
 809                        int size, union i2c_smbus_data *data)
 810 {
 811         int hwpec;
 812         int block = 0;
 813         int ret = 0, xact = 0;
 814         struct i801_priv *priv = i2c_get_adapdata(adap);
 815
 816         mutex_lock(&priv->acpi_lock);
 817         if (priv->acpi_reserved) {
 818                 mutex_unlock(&priv->acpi_lock);
 819                 return -EBUSY;
 820         }
 821
 822         pm_runtime_get_sync(&priv->pci_dev->dev);
 823
 824         hwpec = (priv->features & FEATURE_SMBUS_PEC) && (flags & I2C_CLIENT_PEC)
 825                 && size != I2C_SMBUS_QUICK
 826                 && size != I2C_SMBUS_I2C_BLOCK_DATA;
 827
 828         switch (size) {
 829         case I2C_SMBUS_QUICK:
 830                 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
 831                        SMBHSTADD(priv));
 832                 xact = I801_QUICK;
 833                 break;
 834         case I2C_SMBUS_BYTE:
 835                 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
 836                        SMBHSTADD(priv));
 837                 if (read_write == I2C_SMBUS_WRITE)
 838                         outb_p(command, SMBHSTCMD(priv));
 839                 xact = I801_BYTE;
 840                 break;
 841         case I2C_SMBUS_BYTE_DATA:
 842                 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
 843                        SMBHSTADD(priv));
 844                 outb_p(command, SMBHSTCMD(priv));
 845                 if (read_write == I2C_SMBUS_WRITE)
 846                         outb_p(data->byte, SMBHSTDAT0(priv));
 847                 xact = I801_BYTE_DATA;
 848                 break;
 849         case I2C_SMBUS_WORD_DATA:
 850                 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
 851                        SMBHSTADD(priv));
 852                 outb_p(command, SMBHSTCMD(priv));
 853                 if (read_write == I2C_SMBUS_WRITE) {
 854                         outb_p(data->word & 0xff, SMBHSTDAT0(priv));
 855                         outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1(priv));
 856                 }
 857                 xact = I801_WORD_DATA;
 858                 break;
 859         case I2C_SMBUS_BLOCK_DATA:
 860                 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
 861                        SMBHSTADD(priv));
 862                 outb_p(command, SMBHSTCMD(priv));
 863                 block = 1;
 864                 break;
 865         case I2C_SMBUS_I2C_BLOCK_DATA:
 866                 /* NB: page 240 of ICH5 datasheet shows that the R/#W
 867                  * bit should be cleared here, even when reading */
 868                 outb_p((addr & 0x7f) << 1, SMBHSTADD(priv));
 869                 if (read_write == I2C_SMBUS_READ) {
 870                         /* NB: page 240 of ICH5 datasheet also shows
 871                          * that DATA1 is the cmd field when reading */
 872                         outb_p(command, SMBHSTDAT1(priv));
 873                 } else
 874                         outb_p(command, SMBHSTCMD(priv));
 875                 block = 1;
 876                 break;
 877         default:
 878                 dev_err(&priv->pci_dev->dev, "Unsupported transaction %d\n",
 879                         size);
 880                 ret = -EOPNOTSUPP;
 881                 goto out;
 882         }
 883
 884         if (hwpec)      /* enable/disable hardware PEC */
 885                 outb_p(inb_p(SMBAUXCTL(priv)) | SMBAUXCTL_CRC, SMBAUXCTL(priv));
 886         else
 887                 outb_p(inb_p(SMBAUXCTL(priv)) & (~SMBAUXCTL_CRC),
 888                        SMBAUXCTL(priv));
 889
 890         if (block)
 891                 ret = i801_block_transaction(priv, data, read_write, size,
 892                                              hwpec);
 893         else
 894                 ret = i801_transaction(priv, xact);
 895
 896         /* Some BIOSes don't like it when PEC is enabled at reboot or resume
 897            time, so we forcibly disable it after every transaction. Turn off
 898            E32B for the same reason. */
 899         if (hwpec || block)
 900                 outb_p(inb_p(SMBAUXCTL(priv)) &
 901                        ~(SMBAUXCTL_CRC | SMBAUXCTL_E32B), SMBAUXCTL(priv));
 902
 903         if (block)
 904                 goto out;
 905         if (ret)
 906                 goto out;
 907         if ((read_write == I2C_SMBUS_WRITE) || (xact == I801_QUICK))
 908                 goto out;
 909
 910         switch (xact & 0x7f) {
 911         case I801_BYTE: /* Result put in SMBHSTDAT0 */
 912         case I801_BYTE_DATA:
 913                 data->byte = inb_p(SMBHSTDAT0(priv));
 914                 break;
 915         case I801_WORD_DATA:
 916                 data->word = inb_p(SMBHSTDAT0(priv)) +
 917                              (inb_p(SMBHSTDAT1(priv)) << 8);
 918                 break;
 919         }
 920
 921 out:
 922         pm_runtime_mark_last_busy(&priv->pci_dev->dev);
 923         pm_runtime_put_autosuspend(&priv->pci_dev->dev);
 924         mutex_unlock(&priv->acpi_lock);
 925         return ret;
 926 }
 927
 928
 929 static u32 i801_func(struct i2c_adapter *adapter)
 930 {
 931         struct i801_priv *priv = i2c_get_adapdata(adapter);
 932
 933         return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
 934                I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
 935                I2C_FUNC_SMBUS_BLOCK_DATA | I2C_FUNC_SMBUS_WRITE_I2C_BLOCK |
 936                ((priv->features & FEATURE_SMBUS_PEC) ? I2C_FUNC_SMBUS_PEC : 0) |
 937                ((priv->features & FEATURE_I2C_BLOCK_READ) ?
 938                 I2C_FUNC_SMBUS_READ_I2C_BLOCK : 0) |
 939                ((priv->features & FEATURE_HOST_NOTIFY) ?
 940                 I2C_FUNC_SMBUS_HOST_NOTIFY : 0);
 941 }
 942
 943 static int i801_enable_host_notify(struct i2c_adapter *adapter)
 944 {
 945         struct i801_priv *priv = i2c_get_adapdata(adapter);
 946
 947         if (!(priv->features & FEATURE_HOST_NOTIFY))
 948                 return -ENOTSUPP;
 949
 950         if (!priv->host_notify)
 951                 priv->host_notify = i2c_setup_smbus_host_notify(adapter);
 952         if (!priv->host_notify)
 953                 return -ENOMEM;
 954
 955         outb_p(SMBSLVCMD_HST_NTFY_INTREN, SMBSLVCMD(priv));
 956         /* clear Host Notify bit to allow a new notification */
 957         outb_p(SMBSLVSTS_HST_NTFY_STS, SMBSLVSTS(priv));
 958
 959         return 0;
 960 }
 961
 962 static const struct i2c_algorithm smbus_algorithm = {
 963         .smbus_xfer     = i801_access,
 964         .functionality  = i801_func,
 965 };
 966
 967 static const struct pci_device_id i801_ids[] = {
 968         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801AA_3) },
 969         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801AB_3) },
 970         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_2) },
 971         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_3) },
 972         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_3) },
 973         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_3) },
 974         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB_4) },
 975         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_16) },
 976         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_17) },
 977         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB2_17) },
 978         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH8_5) },
 979         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH9_6) },
 980         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_EP80579_1) },
 981         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH10_4) },
 982         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH10_5) },
 983         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5_3400_SERIES_SMBUS) },
 984         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_COUGARPOINT_SMBUS) },
 985         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS) },
 986         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF0) },
 987         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF1) },
 988         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF2) },
 989         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_DH89XXCC_SMBUS) },
 990         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_PANTHERPOINT_SMBUS) },
 991         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_LYNXPOINT_SMBUS) },
 992         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_LYNXPOINT_LP_SMBUS) },
 993         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_AVOTON_SMBUS) },
 994         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS) },
 995         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS0) },
 996         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS1) },
 997         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS2) },
 998         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_COLETOCREEK_SMBUS) },
 999         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_WILDCATPOINT_SMBUS) },
1000         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_WILDCATPOINT_LP_SMBUS) },
1001         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_BAYTRAIL_SMBUS) },
1002         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_BRASWELL_SMBUS) },
1003         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_SUNRISEPOINT_H_SMBUS) },
1004         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_SUNRISEPOINT_LP_SMBUS) },
1005         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_DNV_SMBUS) },
1006         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_BROXTON_SMBUS) },
1007         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_LEWISBURG_SMBUS) },
1008         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_LEWISBURG_SSKU_SMBUS) },
1009         { 0, }
1010 };
1011
1012 MODULE_DEVICE_TABLE(pci, i801_ids);
1013
1014 #if defined CONFIG_X86 && defined CONFIG_DMI
1015 static unsigned char apanel_addr;
1016
1017 /* Scan the system ROM for the signature "FJKEYINF" */
1018 static __init const void __iomem *bios_signature(const void __iomem *bios)
1019 {
1020         ssize_t offset;
1021         const unsigned char signature[] = "FJKEYINF";
1022
1023         for (offset = 0; offset < 0x10000; offset += 0x10) {
1024                 if (check_signature(bios + offset, signature,
1025                                     sizeof(signature)-1))
1026                         return bios + offset;
1027         }
1028         return NULL;
1029 }
1030
1031 static void __init input_apanel_init(void)
1032 {
1033         void __iomem *bios;
1034         const void __iomem *p;
1035
1036         bios = ioremap(0xF0000, 0x10000); /* Can't fail */
1037         p = bios_signature(bios);
1038         if (p) {
1039                 /* just use the first address */
1040                 apanel_addr = readb(p + 8 + 3) >> 1;
1041         }
1042         iounmap(bios);
1043 }
1044
1045 struct dmi_onboard_device_info {
1046         const char *name;
1047         u8 type;
1048         unsigned short i2c_addr;
1049         const char *i2c_type;
1050 };
1051
1052 static const struct dmi_onboard_device_info dmi_devices[] = {
1053         { "Syleus", DMI_DEV_TYPE_OTHER, 0x73, "fscsyl" },
1054         { "Hermes", DMI_DEV_TYPE_OTHER, 0x73, "fscher" },
1055         { "Hades",  DMI_DEV_TYPE_OTHER, 0x73, "fschds" },
1056 };
1057
1058 static void dmi_check_onboard_device(u8 type, const char *name,
1059                                      struct i2c_adapter *adap)
1060 {
1061         int i;
1062         struct i2c_board_info info;
1063
1064         for (i = 0; i < ARRAY_SIZE(dmi_devices); i++) {
1065                 /* & ~0x80, ignore enabled/disabled bit */
1066                 if ((type & ~0x80) != dmi_devices[i].type)
1067                         continue;
1068                 if (strcasecmp(name, dmi_devices[i].name))
1069                         continue;
1070
1071                 memset(&info, 0, sizeof(struct i2c_board_info));
1072                 info.addr = dmi_devices[i].i2c_addr;
1073                 strlcpy(info.type, dmi_devices[i].i2c_type, I2C_NAME_SIZE);
1074                 i2c_new_device(adap, &info);
1075                 break;
1076         }
1077 }
1078
1079 /* We use our own function to check for onboard devices instead of
1080    dmi_find_device() as some buggy BIOS's have the devices we are interested
1081    in marked as disabled */
1082 static void dmi_check_onboard_devices(const struct dmi_header *dm, void *adap)
1083 {
1084         int i, count;
1085
1086         if (dm->type != 10)
1087                 return;
1088
1089         count = (dm->length - sizeof(struct dmi_header)) / 2;
1090         for (i = 0; i < count; i++) {
1091                 const u8 *d = (char *)(dm + 1) + (i * 2);
1092                 const char *name = ((char *) dm) + dm->length;
1093                 u8 type = d[0];
1094                 u8 s = d[1];
1095
1096                 if (!s)
1097                         continue;
1098                 s--;
1099                 while (s > 0 && name[0]) {
1100                         name += strlen(name) + 1;
1101                         s--;
1102                 }
1103                 if (name[0] == 0) /* Bogus string reference */
1104                         continue;
1105
1106                 dmi_check_onboard_device(type, name, adap);
1107         }
1108 }
1109
1110 /* Register optional slaves */
1111 static void i801_probe_optional_slaves(struct i801_priv *priv)
1112 {
1113         /* Only register slaves on main SMBus channel */
1114         if (priv->features & FEATURE_IDF)
1115                 return;
1116
1117         if (apanel_addr) {
1118                 struct i2c_board_info info;
1119
1120                 memset(&info, 0, sizeof(struct i2c_board_info));
1121                 info.addr = apanel_addr;
1122                 strlcpy(info.type, "fujitsu_apanel", I2C_NAME_SIZE);
1123                 i2c_new_device(&priv->adapter, &info);
1124         }
1125
1126         if (dmi_name_in_vendors("FUJITSU"))
1127                 dmi_walk(dmi_check_onboard_devices, &priv->adapter);
1128 }
1129 #else
1130 static void __init input_apanel_init(void) {}
1131 static void i801_probe_optional_slaves(struct i801_priv *priv) {}
1132 #endif  /* CONFIG_X86 && CONFIG_DMI */
1133
1134 #if IS_ENABLED(CONFIG_I2C_MUX_GPIO) && defined CONFIG_DMI
1135 static struct i801_mux_config i801_mux_config_asus_z8_d12 = {
1136         .gpio_chip = "gpio_ich",
1137         .values = { 0x02, 0x03 },
1138         .n_values = 2,
1139         .classes = { I2C_CLASS_SPD, I2C_CLASS_SPD },
1140         .gpios = { 52, 53 },
1141         .n_gpios = 2,
1142 };
1143
1144 static struct i801_mux_config i801_mux_config_asus_z8_d18 = {
1145         .gpio_chip = "gpio_ich",
1146         .values = { 0x02, 0x03, 0x01 },
1147         .n_values = 3,
1148         .classes = { I2C_CLASS_SPD, I2C_CLASS_SPD, I2C_CLASS_SPD },
1149         .gpios = { 52, 53 },
1150         .n_gpios = 2,
1151 };
1152
1153 static const struct dmi_system_id mux_dmi_table[] = {
1154         {
1155                 .matches = {
1156                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1157                         DMI_MATCH(DMI_BOARD_NAME, "Z8NA-D6(C)"),
1158                 },
1159                 .driver_data = &i801_mux_config_asus_z8_d12,
1160         },
1161         {
1162                 .matches = {
1163                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1164                         DMI_MATCH(DMI_BOARD_NAME, "Z8P(N)E-D12(X)"),
1165                 },
1166                 .driver_data = &i801_mux_config_asus_z8_d12,
1167         },
1168         {
1169                 .matches = {
1170                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1171                         DMI_MATCH(DMI_BOARD_NAME, "Z8NH-D12"),
1172                 },
1173                 .driver_data = &i801_mux_config_asus_z8_d12,
1174         },
1175         {
1176                 .matches = {
1177                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1178                         DMI_MATCH(DMI_BOARD_NAME, "Z8PH-D12/IFB"),
1179                 },
1180                 .driver_data = &i801_mux_config_asus_z8_d12,
1181         },
1182         {
1183                 .matches = {
1184                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1185                         DMI_MATCH(DMI_BOARD_NAME, "Z8NR-D12"),
1186                 },
1187                 .driver_data = &i801_mux_config_asus_z8_d12,
1188         },
1189         {
1190                 .matches = {
1191                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1192                         DMI_MATCH(DMI_BOARD_NAME, "Z8P(N)H-D12"),
1193                 },
1194                 .driver_data = &i801_mux_config_asus_z8_d12,
1195         },
1196         {
1197                 .matches = {
1198                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1199                         DMI_MATCH(DMI_BOARD_NAME, "Z8PG-D18"),
1200                 },
1201                 .driver_data = &i801_mux_config_asus_z8_d18,
1202         },
1203         {
1204                 .matches = {
1205                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1206                         DMI_MATCH(DMI_BOARD_NAME, "Z8PE-D18"),
1207                 },
1208                 .driver_data = &i801_mux_config_asus_z8_d18,
1209         },
1210         {
1211                 .matches = {
1212                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1213                         DMI_MATCH(DMI_BOARD_NAME, "Z8PS-D12"),
1214                 },
1215                 .driver_data = &i801_mux_config_asus_z8_d12,
1216         },
1217         { }
1218 };
1219
1220 /* Setup multiplexing if needed */
1221 static int i801_add_mux(struct i801_priv *priv)
1222 {
1223         struct device *dev = &priv->adapter.dev;
1224         const struct i801_mux_config *mux_config;
1225         struct i2c_mux_gpio_platform_data gpio_data;
1226         int err;
1227
1228         if (!priv->mux_drvdata)
1229                 return 0;
1230         mux_config = priv->mux_drvdata;
1231
1232         /* Prepare the platform data */
1233         memset(&gpio_data, 0, sizeof(struct i2c_mux_gpio_platform_data));
1234         gpio_data.parent = priv->adapter.nr;
1235         gpio_data.values = mux_config->values;
1236         gpio_data.n_values = mux_config->n_values;
1237         gpio_data.classes = mux_config->classes;
1238         gpio_data.gpio_chip = mux_config->gpio_chip;
1239         gpio_data.gpios = mux_config->gpios;
1240         gpio_data.n_gpios = mux_config->n_gpios;
1241         gpio_data.idle = I2C_MUX_GPIO_NO_IDLE;
1242
1243         /* Register the mux device */
1244         priv->mux_pdev = platform_device_register_data(dev, "i2c-mux-gpio",
1245                                 PLATFORM_DEVID_AUTO, &gpio_data,
1246                                 sizeof(struct i2c_mux_gpio_platform_data));
1247         if (IS_ERR(priv->mux_pdev)) {
1248                 err = PTR_ERR(priv->mux_pdev);
1249                 priv->mux_pdev = NULL;
1250                 dev_err(dev, "Failed to register i2c-mux-gpio device\n");
1251                 return err;
1252         }
1253
1254         return 0;
1255 }
1256
1257 static void i801_del_mux(struct i801_priv *priv)
1258 {
1259         if (priv->mux_pdev)
1260                 platform_device_unregister(priv->mux_pdev);
1261 }
1262
1263 static unsigned int i801_get_adapter_class(struct i801_priv *priv)
1264 {
1265         const struct dmi_system_id *id;
1266         const struct i801_mux_config *mux_config;
1267         unsigned int class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
1268         int i;
1269
1270         id = dmi_first_match(mux_dmi_table);
1271         if (id) {
1272                 /* Remove branch classes from trunk */
1273                 mux_config = id->driver_data;
1274                 for (i = 0; i < mux_config->n_values; i++)
1275                         class &= ~mux_config->classes[i];
1276
1277                 /* Remember for later */
1278                 priv->mux_drvdata = mux_config;
1279         }
1280
1281         return class;
1282 }
1283 #else
1284 static inline int i801_add_mux(struct i801_priv *priv) { return 0; }
1285 static inline void i801_del_mux(struct i801_priv *priv) { }
1286
1287 static inline unsigned int i801_get_adapter_class(struct i801_priv *priv)
1288 {
1289         return I2C_CLASS_HWMON | I2C_CLASS_SPD;
1290 }
1291 #endif
1292
1293 static const struct itco_wdt_platform_data tco_platform_data = {
1294         .name = "Intel PCH",
1295         .version = 4,
1296 };
1297
1298 static DEFINE_SPINLOCK(p2sb_spinlock);
1299
1300 static void i801_add_tco(struct i801_priv *priv)
1301 {
1302         struct pci_dev *pci_dev = priv->pci_dev;
1303         struct resource tco_res[3], *res;
1304         struct platform_device *pdev;
1305         unsigned int devfn;
1306         u32 tco_base, tco_ctl;
1307         u32 base_addr, ctrl_val;
1308         u64 base64_addr;
1309
1310         if (!(priv->features & FEATURE_TCO))
1311                 return;
1312
1313         pci_read_config_dword(pci_dev, TCOBASE, &tco_base);
1314         pci_read_config_dword(pci_dev, TCOCTL, &tco_ctl);
1315         if (!(tco_ctl & TCOCTL_EN))
1316                 return;
1317
1318         memset(tco_res, 0, sizeof(tco_res));
1319
1320         res = &tco_res[ICH_RES_IO_TCO];
1321         res->start = tco_base & ~1;
1322         res->end = res->start + 32 - 1;
1323         res->flags = IORESOURCE_IO;
1324
1325         /*
1326          * Power Management registers.
1327          */
1328         devfn = PCI_DEVFN(PCI_SLOT(pci_dev->devfn), 2);
1329         pci_bus_read_config_dword(pci_dev->bus, devfn, ACPIBASE, &base_addr);
1330
1331         res = &tco_res[ICH_RES_IO_SMI];
1332         res->start = (base_addr & ~1) + ACPIBASE_SMI_OFF;
1333         res->end = res->start + 3;
1334         res->flags = IORESOURCE_IO;
1335
1336         /*
1337          * Enable the ACPI I/O space.
1338          */
1339         pci_bus_read_config_dword(pci_dev->bus, devfn, ACPICTRL, &ctrl_val);
1340         ctrl_val |= ACPICTRL_EN;
1341         pci_bus_write_config_dword(pci_dev->bus, devfn, ACPICTRL, ctrl_val);
1342
1343         /*
1344          * We must access the NO_REBOOT bit over the Primary to Sideband
1345          * bridge (P2SB). The BIOS prevents the P2SB device from being
1346          * enumerated by the PCI subsystem, so we need to unhide/hide it
1347          * to lookup the P2SB BAR.
1348          */
1349         spin_lock(&p2sb_spinlock);
1350
1351         devfn = PCI_DEVFN(PCI_SLOT(pci_dev->devfn), 1);
1352
1353         /* Unhide the P2SB device */
1354         pci_bus_write_config_byte(pci_dev->bus, devfn, 0xe1, 0x0);
1355
1356         pci_bus_read_config_dword(pci_dev->bus, devfn, SBREG_BAR, &base_addr);
1357         base64_addr = base_addr & 0xfffffff0;
1358
1359         pci_bus_read_config_dword(pci_dev->bus, devfn, SBREG_BAR + 0x4, &base_addr);
1360         base64_addr |= (u64)base_addr << 32;
1361
1362         /* Hide the P2SB device */
1363         pci_bus_write_config_byte(pci_dev->bus, devfn, 0xe1, 0x1);
1364         spin_unlock(&p2sb_spinlock);
1365
1366         res = &tco_res[ICH_RES_MEM_OFF];
1367         res->start = (resource_size_t)base64_addr + SBREG_SMBCTRL;
1368         res->end = res->start + 3;
1369         res->flags = IORESOURCE_MEM;
1370
1371         pdev = platform_device_register_resndata(&pci_dev->dev, "iTCO_wdt", -1,
1372                                                  tco_res, 3, &tco_platform_data,
1373                                                  sizeof(tco_platform_data));
1374         if (IS_ERR(pdev)) {
1375                 dev_warn(&pci_dev->dev, "failed to create iTCO device\n");
1376                 return;
1377         }
1378
1379         priv->tco_pdev = pdev;
1380 }
1381
1382 #ifdef CONFIG_ACPI
1383 static acpi_status
1384 i801_acpi_io_handler(u32 function, acpi_physical_address address, u32 bits,
1385                      u64 *value, void *handler_context, void *region_context)
1386 {
1387         struct i801_priv *priv = handler_context;
1388         struct pci_dev *pdev = priv->pci_dev;
1389         acpi_status status;
1390
1391         /*
1392          * Once BIOS AML code touches the OpRegion we warn and inhibit any
1393          * further access from the driver itself. This device is now owned
1394          * by the system firmware.
1395          */
1396         mutex_lock(&priv->acpi_lock);
1397
1398         if (!priv->acpi_reserved) {
1399                 priv->acpi_reserved = true;
1400
1401                 dev_warn(&pdev->dev, "BIOS is accessing SMBus registers\n");
1402                 dev_warn(&pdev->dev, "Driver SMBus register access inhibited\n");
1403
1404                 /*
1405                  * BIOS is accessing the host controller so prevent it from
1406                  * suspending automatically from now on.
1407                  */
1408                 pm_runtime_get_sync(&pdev->dev);
1409         }
1410
1411         if ((function & ACPI_IO_MASK) == ACPI_READ)
1412                 status = acpi_os_read_port(address, (u32 *)value, bits);
1413         else
1414                 status = acpi_os_write_port(address, (u32)*value, bits);
1415
1416         mutex_unlock(&priv->acpi_lock);
1417
1418         return status;
1419 }
1420
1421 static int i801_acpi_probe(struct i801_priv *priv)
1422 {
1423         struct acpi_device *adev;
1424         acpi_status status;
1425
1426         adev = ACPI_COMPANION(&priv->pci_dev->dev);
1427         if (adev) {
1428                 status = acpi_install_address_space_handler(adev->handle,
1429                                 ACPI_ADR_SPACE_SYSTEM_IO, i801_acpi_io_handler,
1430                                 NULL, priv);
1431                 if (ACPI_SUCCESS(status))
1432                         return 0;
1433         }
1434
1435         return acpi_check_resource_conflict(&priv->pci_dev->resource[SMBBAR]);
1436 }
1437
1438 static void i801_acpi_remove(struct i801_priv *priv)
1439 {
1440         struct acpi_device *adev;
1441
1442         adev = ACPI_COMPANION(&priv->pci_dev->dev);
1443         if (!adev)
1444                 return;
1445
1446         acpi_remove_address_space_handler(adev->handle,
1447                 ACPI_ADR_SPACE_SYSTEM_IO, i801_acpi_io_handler);
1448
1449         mutex_lock(&priv->acpi_lock);
1450         if (priv->acpi_reserved)
1451                 pm_runtime_put(&priv->pci_dev->dev);
1452         mutex_unlock(&priv->acpi_lock);
1453 }
1454 #else
1455 static inline int i801_acpi_probe(struct i801_priv *priv) { return 0; }
1456 static inline void i801_acpi_remove(struct i801_priv *priv) { }
1457 #endif
1458
1459 static int i801_probe(struct pci_dev *dev, const struct pci_device_id *id)
1460 {
1461         unsigned char temp;
1462         int err, i;
1463         struct i801_priv *priv;
1464
1465         priv = devm_kzalloc(&dev->dev, sizeof(*priv), GFP_KERNEL);
1466         if (!priv)
1467                 return -ENOMEM;
1468
1469         i2c_set_adapdata(&priv->adapter, priv);
1470         priv->adapter.owner = THIS_MODULE;
1471         priv->adapter.class = i801_get_adapter_class(priv);
1472         priv->adapter.algo = &smbus_algorithm;
1473         priv->adapter.dev.parent = &dev->dev;
1474         ACPI_COMPANION_SET(&priv->adapter.dev, ACPI_COMPANION(&dev->dev));
1475         priv->adapter.retries = 3;
1476         mutex_init(&priv->acpi_lock);
1477
1478         priv->pci_dev = dev;
1479         switch (dev->device) {
1480         case PCI_DEVICE_ID_INTEL_SUNRISEPOINT_H_SMBUS:
1481         case PCI_DEVICE_ID_INTEL_SUNRISEPOINT_LP_SMBUS:
1482         case PCI_DEVICE_ID_INTEL_LEWISBURG_SMBUS:
1483         case PCI_DEVICE_ID_INTEL_LEWISBURG_SSKU_SMBUS:
1484         case PCI_DEVICE_ID_INTEL_DNV_SMBUS:
1485                 priv->features |= FEATURE_I2C_BLOCK_READ;
1486                 priv->features |= FEATURE_IRQ;
1487                 priv->features |= FEATURE_SMBUS_PEC;
1488                 priv->features |= FEATURE_BLOCK_BUFFER;
1489                 priv->features |= FEATURE_TCO;
1490                 priv->features |= FEATURE_HOST_NOTIFY;
1491                 break;
1492
1493         case PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF0:
1494         case PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF1:
1495         case PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF2:
1496         case PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS0:
1497         case PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS1:
1498         case PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS2:
1499                 priv->features |= FEATURE_IDF;
1500                 /* fall through */
1501         default:
1502                 priv->features |= FEATURE_I2C_BLOCK_READ;
1503                 priv->features |= FEATURE_IRQ;
1504                 /* fall through */
1505         case PCI_DEVICE_ID_INTEL_82801DB_3:
1506                 priv->features |= FEATURE_SMBUS_PEC;
1507                 priv->features |= FEATURE_BLOCK_BUFFER;
1508                 /* fall through */
1509         case PCI_DEVICE_ID_INTEL_82801CA_3:
1510                 priv->features |= FEATURE_HOST_NOTIFY;
1511                 /* fall through */
1512         case PCI_DEVICE_ID_INTEL_82801BA_2:
1513         case PCI_DEVICE_ID_INTEL_82801AB_3:
1514         case PCI_DEVICE_ID_INTEL_82801AA_3:
1515                 break;
1516         }
1517
1518         /* Disable features on user request */
1519         for (i = 0; i < ARRAY_SIZE(i801_feature_names); i++) {
1520                 if (priv->features & disable_features & (1 << i))
1521                         dev_notice(&dev->dev, "%s disabled by user\n",
1522                                    i801_feature_names[i]);
1523         }
1524         priv->features &= ~disable_features;
1525
1526         err = pcim_enable_device(dev);
1527         if (err) {
1528                 dev_err(&dev->dev, "Failed to enable SMBus PCI device (%d)\n",
1529                         err);
1530                 return err;
1531         }
1532         pcim_pin_device(dev);
1533
1534         /* Determine the address of the SMBus area */
1535         priv->smba = pci_resource_start(dev, SMBBAR);
1536         if (!priv->smba) {
1537                 dev_err(&dev->dev,
1538                         "SMBus base address uninitialized, upgrade BIOS\n");
1539                 return -ENODEV;
1540         }
1541
1542         if (i801_acpi_probe(priv))
1543                 return -ENODEV;
1544
1545         err = pcim_iomap_regions(dev, 1 << SMBBAR,
1546                                  dev_driver_string(&dev->dev));
1547         if (err) {
1548                 dev_err(&dev->dev,
1549                         "Failed to request SMBus region 0x%lx-0x%Lx\n",
1550                         priv->smba,
1551                         (unsigned long long)pci_resource_end(dev, SMBBAR));
1552                 i801_acpi_remove(priv);
1553                 return err;
1554         }
1555
1556         pci_read_config_byte(priv->pci_dev, SMBHSTCFG, &temp);
1557         priv->original_hstcfg = temp;
1558         temp &= ~SMBHSTCFG_I2C_EN;      /* SMBus timing */
1559         if (!(temp & SMBHSTCFG_HST_EN)) {
1560                 dev_info(&dev->dev, "Enabling SMBus device\n");
1561                 temp |= SMBHSTCFG_HST_EN;
1562         }
1563         pci_write_config_byte(priv->pci_dev, SMBHSTCFG, temp);
1564
1565         if (temp & SMBHSTCFG_SMB_SMI_EN) {
1566                 dev_dbg(&dev->dev, "SMBus using interrupt SMI#\n");
1567                 /* Disable SMBus interrupt feature if SMBus using SMI# */
1568                 priv->features &= ~FEATURE_IRQ;
1569         }
1570
1571         /* Clear special mode bits */
1572         if (priv->features & (FEATURE_SMBUS_PEC | FEATURE_BLOCK_BUFFER))
1573                 outb_p(inb_p(SMBAUXCTL(priv)) &
1574                        ~(SMBAUXCTL_CRC | SMBAUXCTL_E32B), SMBAUXCTL(priv));
1575
1576         /* Default timeout in interrupt mode: 200 ms */
1577         priv->adapter.timeout = HZ / 5;
1578
1579         if (priv->features & FEATURE_IRQ) {
1580                 u16 pcictl, pcists;
1581
1582                 /* Complain if an interrupt is already pending */
1583                 pci_read_config_word(priv->pci_dev, SMBPCISTS, &pcists);
1584                 if (pcists & SMBPCISTS_INTS)
1585                         dev_warn(&dev->dev, "An interrupt is pending!\n");
1586
1587                 /* Check if interrupts have been disabled */
1588                 pci_read_config_word(priv->pci_dev, SMBPCICTL, &pcictl);
1589                 if (pcictl & SMBPCICTL_INTDIS) {
1590                         dev_info(&dev->dev, "Interrupts are disabled\n");
1591                         priv->features &= ~FEATURE_IRQ;
1592                 }
1593         }
1594
1595         if (priv->features & FEATURE_IRQ) {
1596                 init_waitqueue_head(&priv->waitq);
1597
1598                 err = devm_request_irq(&dev->dev, dev->irq, i801_isr,
1599                                        IRQF_SHARED,
1600                                        dev_driver_string(&dev->dev), priv);
1601                 if (err) {
1602                         dev_err(&dev->dev, "Failed to allocate irq %d: %d\n",
1603                                 dev->irq, err);
1604                         priv->features &= ~FEATURE_IRQ;
1605                 }
1606         }
1607         dev_info(&dev->dev, "SMBus using %s\n",
1608                  priv->features & FEATURE_IRQ ? "PCI interrupt" : "polling");
1609
1610         i801_add_tco(priv);
1611
1612         snprintf(priv->adapter.name, sizeof(priv->adapter.name),
1613                 "SMBus I801 adapter at %04lx", priv->smba);
1614         err = i2c_add_adapter(&priv->adapter);
1615         if (err) {
1616                 dev_err(&dev->dev, "Failed to add SMBus adapter\n");
1617                 i801_acpi_remove(priv);
1618                 return err;
1619         }
1620
1621         /*
1622          * Enable Host Notify for chips that supports it.
1623          * It is done after i2c_add_adapter() so that we are sure the work queue
1624          * is not used if i2c_add_adapter() fails.
1625          */
1626         err = i801_enable_host_notify(&priv->adapter);
1627         if (err && err != -ENOTSUPP)
1628                 dev_warn(&dev->dev, "Unable to enable SMBus Host Notify\n");
1629
1630         i801_probe_optional_slaves(priv);
1631         /* We ignore errors - multiplexing is optional */
1632         i801_add_mux(priv);
1633
1634         pci_set_drvdata(dev, priv);
1635
1636         pm_runtime_set_autosuspend_delay(&dev->dev, 1000);
1637         pm_runtime_use_autosuspend(&dev->dev);
1638         pm_runtime_put_autosuspend(&dev->dev);
1639         pm_runtime_allow(&dev->dev);
1640
1641         return 0;
1642 }
1643
1644 static void i801_remove(struct pci_dev *dev)
1645 {
1646         struct i801_priv *priv = pci_get_drvdata(dev);
1647
1648         pm_runtime_forbid(&dev->dev);
1649         pm_runtime_get_noresume(&dev->dev);
1650
1651         i801_del_mux(priv);
1652         i2c_del_adapter(&priv->adapter);
1653         i801_acpi_remove(priv);
1654         pci_write_config_byte(dev, SMBHSTCFG, priv->original_hstcfg);
1655
1656         platform_device_unregister(priv->tco_pdev);
1657
1658         /*
1659          * do not call pci_disable_device(dev) since it can cause hard hangs on
1660          * some systems during power-off (eg. Fujitsu-Siemens Lifebook E8010)
1661          */
1662 }
1663
1664 #ifdef CONFIG_PM
1665 static int i801_suspend(struct device *dev)
1666 {
1667         struct pci_dev *pci_dev = to_pci_dev(dev);
1668         struct i801_priv *priv = pci_get_drvdata(pci_dev);
1669
1670         pci_write_config_byte(pci_dev, SMBHSTCFG, priv->original_hstcfg);
1671         return 0;
1672 }
1673
1674 static int i801_resume(struct device *dev)
1675 {
1676         struct pci_dev *pci_dev = to_pci_dev(dev);
1677         struct i801_priv *priv = pci_get_drvdata(pci_dev);
1678         int err;
1679
1680         err = i801_enable_host_notify(&priv->adapter);
1681         if (err && err != -ENOTSUPP)
1682                 dev_warn(dev, "Unable to enable SMBus Host Notify\n");
1683
1684         return 0;
1685 }
1686 #endif
1687
1688 static UNIVERSAL_DEV_PM_OPS(i801_pm_ops, i801_suspend,
1689                             i801_resume, NULL);
1690
1691 static struct pci_driver i801_driver = {
1692         .name           = "i801_smbus",
1693         .id_table       = i801_ids,
1694         .probe          = i801_probe,
1695         .remove         = i801_remove,
1696         .driver         = {
1697                 .pm     = &i801_pm_ops,
1698         },
1699 };
1700
1701 static int __init i2c_i801_init(void)
1702 {
1703         if (dmi_name_in_vendors("FUJITSU"))
1704                 input_apanel_init();
1705         return pci_register_driver(&i801_driver);
1706 }
1707
1708 static void __exit i2c_i801_exit(void)
1709 {
1710         pci_unregister_driver(&i801_driver);
1711 }
1712
1713 MODULE_AUTHOR("Mark D. Studebaker <mdsxyz123@yahoo.com>, Jean Delvare <jdelvare@suse.de>");
1714 MODULE_DESCRIPTION("I801 SMBus driver");
1715 MODULE_LICENSE("GPL");
1716
1717 module_init(i2c_i801_init);
1718 module_exit(i2c_i801_exit);