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  * Braswell (SOC)               0x2292  32      hard    yes     yes     yes
  62  * Sunrise Point-H (PCH)        0xa123  32      hard    yes     yes     yes
  63  * Sunrise Point-LP (PCH)       0x9d23  32      hard    yes     yes     yes
  64  * DNV (SOC)                    0x19df  32      hard    yes     yes     yes
  65  * Broxton (SOC)                0x5ad4  32      hard    yes     yes     yes
  66  * Lewisburg (PCH)              0xa1a3  32      hard    yes     yes     yes
  67  * Lewisburg Supersku (PCH)     0xa223  32      hard    yes     yes     yes
  68  * Kaby Lake PCH-H (PCH)        0xa2a3  32      hard    yes     yes     yes
  69  * Gemini Lake (SOC)            0x31d4  32      hard    yes     yes     yes
  70  * Cannon Lake-H (PCH)          0xa323  32      hard    yes     yes     yes
  71  * Cannon Lake-LP (PCH)         0x9da3  32      hard    yes     yes     yes
  72  * Cedar Fork (PCH)             0x18df  32      hard    yes     yes     yes
  73  * Ice Lake-LP (PCH)            0x34a3  32      hard    yes     yes     yes
  74  * Comet Lake (PCH)             0x02a3  32      hard    yes     yes     yes
  75  *
  76  * Features supported by this driver:
  77  * Software PEC                         no
  78  * Hardware PEC                         yes
  79  * Block buffer                         yes
  80  * Block process call transaction       no
  81  * I2C block read transaction           yes (doesn't use the block buffer)
  82  * Slave mode                           no
  83  * SMBus Host Notify                    yes
  84  * Interrupt processing                 yes
  85  *
  86  * See the file Documentation/i2c/busses/i2c-i801 for details.
  87  */
  88
  89 #include <linux/interrupt.h>
  90 #include <linux/module.h>
  91 #include <linux/pci.h>
  92 #include <linux/kernel.h>
  93 #include <linux/stddef.h>
  94 #include <linux/delay.h>
  95 #include <linux/ioport.h>
  96 #include <linux/init.h>
  97 #include <linux/i2c.h>
  98 #include <linux/i2c-smbus.h>
  99 #include <linux/acpi.h>
 100 #include <linux/io.h>
 101 #include <linux/dmi.h>
 102 #include <linux/slab.h>
 103 #include <linux/wait.h>
 104 #include <linux/err.h>
 105 #include <linux/platform_device.h>
 106 #include <linux/platform_data/itco_wdt.h>
 107 #include <linux/pm_runtime.h>
 108
 109 #if IS_ENABLED(CONFIG_I2C_MUX_GPIO) && defined CONFIG_DMI
 110 #include <linux/gpio.h>
 111 #include <linux/platform_data/i2c-mux-gpio.h>
 112 #endif
 113
 114 /* I801 SMBus address offsets */
 115 #define SMBHSTSTS(p)    (0 + (p)->smba)
 116 #define SMBHSTCNT(p)    (2 + (p)->smba)
 117 #define SMBHSTCMD(p)    (3 + (p)->smba)
 118 #define SMBHSTADD(p)    (4 + (p)->smba)
 119 #define SMBHSTDAT0(p)   (5 + (p)->smba)
 120 #define SMBHSTDAT1(p)   (6 + (p)->smba)
 121 #define SMBBLKDAT(p)    (7 + (p)->smba)
 122 #define SMBPEC(p)       (8 + (p)->smba)         /* ICH3 and later */
 123 #define SMBAUXSTS(p)    (12 + (p)->smba)        /* ICH4 and later */
 124 #define SMBAUXCTL(p)    (13 + (p)->smba)        /* ICH4 and later */
 125 #define SMBSLVSTS(p)    (16 + (p)->smba)        /* ICH3 and later */
 126 #define SMBSLVCMD(p)    (17 + (p)->smba)        /* ICH3 and later */
 127 #define SMBNTFDADD(p)   (20 + (p)->smba)        /* ICH3 and later */
 128
 129 /* PCI Address Constants */
 130 #define SMBBAR          4
 131 #define SMBPCICTL       0x004
 132 #define SMBPCISTS       0x006
 133 #define SMBHSTCFG       0x040
 134 #define TCOBASE         0x050
 135 #define TCOCTL          0x054
 136
 137 #define ACPIBASE                0x040
 138 #define ACPIBASE_SMI_OFF        0x030
 139 #define ACPICTRL                0x044
 140 #define ACPICTRL_EN             0x080
 141
 142 #define SBREG_BAR               0x10
 143 #define SBREG_SMBCTRL           0xc6000c
 144 #define SBREG_SMBCTRL_DNV       0xcf000c
 145
 146 /* Host status bits for SMBPCISTS */
 147 #define SMBPCISTS_INTS          BIT(3)
 148
 149 /* Control bits for SMBPCICTL */
 150 #define SMBPCICTL_INTDIS        BIT(10)
 151
 152 /* Host configuration bits for SMBHSTCFG */
 153 #define SMBHSTCFG_HST_EN        BIT(0)
 154 #define SMBHSTCFG_SMB_SMI_EN    BIT(1)
 155 #define SMBHSTCFG_I2C_EN        BIT(2)
 156 #define SMBHSTCFG_SPD_WD        BIT(4)
 157
 158 /* TCO configuration bits for TCOCTL */
 159 #define TCOCTL_EN               BIT(8)
 160
 161 /* Auxiliary status register bits, ICH4+ only */
 162 #define SMBAUXSTS_CRCE          BIT(0)
 163 #define SMBAUXSTS_STCO          BIT(1)
 164
 165 /* Auxiliary control register bits, ICH4+ only */
 166 #define SMBAUXCTL_CRC           BIT(0)
 167 #define SMBAUXCTL_E32B          BIT(1)
 168
 169 /* Other settings */
 170 #define MAX_RETRIES             400
 171
 172 /* I801 command constants */
 173 #define I801_QUICK              0x00
 174 #define I801_BYTE               0x04
 175 #define I801_BYTE_DATA          0x08
 176 #define I801_WORD_DATA          0x0C
 177 #define I801_PROC_CALL          0x10    /* unimplemented */
 178 #define I801_BLOCK_DATA         0x14
 179 #define I801_I2C_BLOCK_DATA     0x18    /* ICH5 and later */
 180
 181 /* I801 Host Control register bits */
 182 #define SMBHSTCNT_INTREN        BIT(0)
 183 #define SMBHSTCNT_KILL          BIT(1)
 184 #define SMBHSTCNT_LAST_BYTE     BIT(5)
 185 #define SMBHSTCNT_START         BIT(6)
 186 #define SMBHSTCNT_PEC_EN        BIT(7)  /* ICH3 and later */
 187
 188 /* I801 Hosts Status register bits */
 189 #define SMBHSTSTS_BYTE_DONE     BIT(7)
 190 #define SMBHSTSTS_INUSE_STS     BIT(6)
 191 #define SMBHSTSTS_SMBALERT_STS  BIT(5)
 192 #define SMBHSTSTS_FAILED        BIT(4)
 193 #define SMBHSTSTS_BUS_ERR       BIT(3)
 194 #define SMBHSTSTS_DEV_ERR       BIT(2)
 195 #define SMBHSTSTS_INTR          BIT(1)
 196 #define SMBHSTSTS_HOST_BUSY     BIT(0)
 197
 198 /* Host Notify Status register bits */
 199 #define SMBSLVSTS_HST_NTFY_STS  BIT(0)
 200
 201 /* Host Notify Command register bits */
 202 #define SMBSLVCMD_HST_NTFY_INTREN       BIT(0)
 203
 204 #define STATUS_ERROR_FLAGS      (SMBHSTSTS_FAILED | SMBHSTSTS_BUS_ERR | \
 205                                  SMBHSTSTS_DEV_ERR)
 206
 207 #define STATUS_FLAGS            (SMBHSTSTS_BYTE_DONE | SMBHSTSTS_INTR | \
 208                                  STATUS_ERROR_FLAGS)
 209
 210 /* Older devices have their ID defined in <linux/pci_ids.h> */
 211 #define PCI_DEVICE_ID_INTEL_BAYTRAIL_SMBUS              0x0f12
 212 #define PCI_DEVICE_ID_INTEL_CDF_SMBUS                   0x18df
 213 #define PCI_DEVICE_ID_INTEL_DNV_SMBUS                   0x19df
 214 #define PCI_DEVICE_ID_INTEL_COUGARPOINT_SMBUS           0x1c22
 215 #define PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS              0x1d22
 216 /* Patsburg also has three 'Integrated Device Function' SMBus controllers */
 217 #define PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF0         0x1d70
 218 #define PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF1         0x1d71
 219 #define PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF2         0x1d72
 220 #define PCI_DEVICE_ID_INTEL_PANTHERPOINT_SMBUS          0x1e22
 221 #define PCI_DEVICE_ID_INTEL_AVOTON_SMBUS                0x1f3c
 222 #define PCI_DEVICE_ID_INTEL_BRASWELL_SMBUS              0x2292
 223 #define PCI_DEVICE_ID_INTEL_DH89XXCC_SMBUS              0x2330
 224 #define PCI_DEVICE_ID_INTEL_COLETOCREEK_SMBUS           0x23b0
 225 #define PCI_DEVICE_ID_INTEL_GEMINILAKE_SMBUS            0x31d4
 226 #define PCI_DEVICE_ID_INTEL_ICELAKE_LP_SMBUS            0x34a3
 227 #define PCI_DEVICE_ID_INTEL_5_3400_SERIES_SMBUS         0x3b30
 228 #define PCI_DEVICE_ID_INTEL_BROXTON_SMBUS               0x5ad4
 229 #define PCI_DEVICE_ID_INTEL_LYNXPOINT_SMBUS             0x8c22
 230 #define PCI_DEVICE_ID_INTEL_WILDCATPOINT_SMBUS          0x8ca2
 231 #define PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS             0x8d22
 232 #define PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS0         0x8d7d
 233 #define PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS1         0x8d7e
 234 #define PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS2         0x8d7f
 235 #define PCI_DEVICE_ID_INTEL_LYNXPOINT_LP_SMBUS          0x9c22
 236 #define PCI_DEVICE_ID_INTEL_WILDCATPOINT_LP_SMBUS       0x9ca2
 237 #define PCI_DEVICE_ID_INTEL_SUNRISEPOINT_LP_SMBUS       0x9d23
 238 #define PCI_DEVICE_ID_INTEL_CANNONLAKE_LP_SMBUS         0x9da3
 239 #define PCI_DEVICE_ID_INTEL_SUNRISEPOINT_H_SMBUS        0xa123
 240 #define PCI_DEVICE_ID_INTEL_LEWISBURG_SMBUS             0xa1a3
 241 #define PCI_DEVICE_ID_INTEL_LEWISBURG_SSKU_SMBUS        0xa223
 242 #define PCI_DEVICE_ID_INTEL_KABYLAKE_PCH_H_SMBUS        0xa2a3
 243 #define PCI_DEVICE_ID_INTEL_CANNONLAKE_H_SMBUS          0xa323
 244 #define PCI_DEVICE_ID_INTEL_COMETLAKE_SMBUS             0x02a3
 245
 246 struct i801_mux_config {
 247         char *gpio_chip;
 248         unsigned values[3];
 249         int n_values;
 250         unsigned classes[3];
 251         unsigned gpios[2];              /* Relative to gpio_chip->base */
 252         int n_gpios;
 253 };
 254
 255 struct i801_priv {
 256         struct i2c_adapter adapter;
 257         unsigned long smba;
 258         unsigned char original_hstcfg;
 259         unsigned char original_slvcmd;
 260         struct pci_dev *pci_dev;
 261         unsigned int features;
 262
 263         /* isr processing */
 264         wait_queue_head_t waitq;
 265         u8 status;
 266
 267         /* Command state used by isr for byte-by-byte block transactions */
 268         u8 cmd;
 269         bool is_read;
 270         int count;
 271         int len;
 272         u8 *data;
 273
 274 #if IS_ENABLED(CONFIG_I2C_MUX_GPIO) && defined CONFIG_DMI
 275         const struct i801_mux_config *mux_drvdata;
 276         struct platform_device *mux_pdev;
 277 #endif
 278         struct platform_device *tco_pdev;
 279
 280         /*
 281          * If set to true the host controller registers are reserved for
 282          * ACPI AML use. Protected by acpi_lock.
 283          */
 284         bool acpi_reserved;
 285         struct mutex acpi_lock;
 286 };
 287
 288 #define FEATURE_SMBUS_PEC       BIT(0)
 289 #define FEATURE_BLOCK_BUFFER    BIT(1)
 290 #define FEATURE_BLOCK_PROC      BIT(2)
 291 #define FEATURE_I2C_BLOCK_READ  BIT(3)
 292 #define FEATURE_IRQ             BIT(4)
 293 #define FEATURE_HOST_NOTIFY     BIT(5)
 294 /* Not really a feature, but it's convenient to handle it as such */
 295 #define FEATURE_IDF             BIT(15)
 296 #define FEATURE_TCO             BIT(16)
 297
 298 static const char *i801_feature_names[] = {
 299         "SMBus PEC",
 300         "Block buffer",
 301         "Block process call",
 302         "I2C block read",
 303         "Interrupt",
 304         "SMBus Host Notify",
 305 };
 306
 307 static unsigned int disable_features;
 308 module_param(disable_features, uint, S_IRUGO | S_IWUSR);
 309 MODULE_PARM_DESC(disable_features, "Disable selected driver features:\n"
 310         "\t\t  0x01  disable SMBus PEC\n"
 311         "\t\t  0x02  disable the block buffer\n"
 312         "\t\t  0x08  disable the I2C block read functionality\n"
 313         "\t\t  0x10  don't use interrupts\n"
 314         "\t\t  0x20  disable SMBus Host Notify ");
 315
 316 /* Make sure the SMBus host is ready to start transmitting.
 317    Return 0 if it is, -EBUSY if it is not. */
 318 static int i801_check_pre(struct i801_priv *priv)
 319 {
 320         int status;
 321
 322         status = inb_p(SMBHSTSTS(priv));
 323         if (status & SMBHSTSTS_HOST_BUSY) {
 324                 dev_err(&priv->pci_dev->dev, "SMBus is busy, can't use it!\n");
 325                 return -EBUSY;
 326         }
 327
 328         status &= STATUS_FLAGS;
 329         if (status) {
 330                 dev_dbg(&priv->pci_dev->dev, "Clearing status flags (%02x)\n",
 331                         status);
 332                 outb_p(status, SMBHSTSTS(priv));
 333                 status = inb_p(SMBHSTSTS(priv)) & STATUS_FLAGS;
 334                 if (status) {
 335                         dev_err(&priv->pci_dev->dev,
 336                                 "Failed clearing status flags (%02x)\n",
 337                                 status);
 338                         return -EBUSY;
 339                 }
 340         }
 341
 342         /*
 343          * Clear CRC status if needed.
 344          * During normal operation, i801_check_post() takes care
 345          * of it after every operation.  We do it here only in case
 346          * the hardware was already in this state when the driver
 347          * started.
 348          */
 349         if (priv->features & FEATURE_SMBUS_PEC) {
 350                 status = inb_p(SMBAUXSTS(priv)) & SMBAUXSTS_CRCE;
 351                 if (status) {
 352                         dev_dbg(&priv->pci_dev->dev,
 353                                 "Clearing aux status flags (%02x)\n", status);
 354                         outb_p(status, SMBAUXSTS(priv));
 355                         status = inb_p(SMBAUXSTS(priv)) & SMBAUXSTS_CRCE;
 356                         if (status) {
 357                                 dev_err(&priv->pci_dev->dev,
 358                                         "Failed clearing aux status flags (%02x)\n",
 359                                         status);
 360                                 return -EBUSY;
 361                         }
 362                 }
 363         }
 364
 365         return 0;
 366 }
 367
 368 /*
 369  * Convert the status register to an error code, and clear it.
 370  * Note that status only contains the bits we want to clear, not the
 371  * actual register value.
 372  */
 373 static int i801_check_post(struct i801_priv *priv, int status)
 374 {
 375         int result = 0;
 376
 377         /*
 378          * If the SMBus is still busy, we give up
 379          * Note: This timeout condition only happens when using polling
 380          * transactions.  For interrupt operation, NAK/timeout is indicated by
 381          * DEV_ERR.
 382          */
 383         if (unlikely(status < 0)) {
 384                 dev_err(&priv->pci_dev->dev, "Transaction timeout\n");
 385                 /* try to stop the current command */
 386                 dev_dbg(&priv->pci_dev->dev, "Terminating the current operation\n");
 387                 outb_p(inb_p(SMBHSTCNT(priv)) | SMBHSTCNT_KILL,
 388                        SMBHSTCNT(priv));
 389                 usleep_range(1000, 2000);
 390                 outb_p(inb_p(SMBHSTCNT(priv)) & (~SMBHSTCNT_KILL),
 391                        SMBHSTCNT(priv));
 392
 393                 /* Check if it worked */
 394                 status = inb_p(SMBHSTSTS(priv));
 395                 if ((status & SMBHSTSTS_HOST_BUSY) ||
 396                     !(status & SMBHSTSTS_FAILED))
 397                         dev_err(&priv->pci_dev->dev,
 398                                 "Failed terminating the transaction\n");
 399                 outb_p(STATUS_FLAGS, SMBHSTSTS(priv));
 400                 return -ETIMEDOUT;
 401         }
 402
 403         if (status & SMBHSTSTS_FAILED) {
 404                 result = -EIO;
 405                 dev_err(&priv->pci_dev->dev, "Transaction failed\n");
 406         }
 407         if (status & SMBHSTSTS_DEV_ERR) {
 408                 /*
 409                  * This may be a PEC error, check and clear it.
 410                  *
 411                  * AUXSTS is handled differently from HSTSTS.
 412                  * For HSTSTS, i801_isr() or i801_wait_intr()
 413                  * has already cleared the error bits in hardware,
 414                  * and we are passed a copy of the original value
 415                  * in "status".
 416                  * For AUXSTS, the hardware register is left
 417                  * for us to handle here.
 418                  * This is asymmetric, slightly iffy, but safe,
 419                  * since all this code is serialized and the CRCE
 420                  * bit is harmless as long as it's cleared before
 421                  * the next operation.
 422                  */
 423                 if ((priv->features & FEATURE_SMBUS_PEC) &&
 424                     (inb_p(SMBAUXSTS(priv)) & SMBAUXSTS_CRCE)) {
 425                         outb_p(SMBAUXSTS_CRCE, SMBAUXSTS(priv));
 426                         result = -EBADMSG;
 427                         dev_dbg(&priv->pci_dev->dev, "PEC error\n");
 428                 } else {
 429                         result = -ENXIO;
 430                         dev_dbg(&priv->pci_dev->dev, "No response\n");
 431                 }
 432         }
 433         if (status & SMBHSTSTS_BUS_ERR) {
 434                 result = -EAGAIN;
 435                 dev_dbg(&priv->pci_dev->dev, "Lost arbitration\n");
 436         }
 437
 438         /* Clear status flags except BYTE_DONE, to be cleared by caller */
 439         outb_p(status, SMBHSTSTS(priv));
 440
 441         return result;
 442 }
 443
 444 /* Wait for BUSY being cleared and either INTR or an error flag being set */
 445 static int i801_wait_intr(struct i801_priv *priv)
 446 {
 447         int timeout = 0;
 448         int status;
 449
 450         /* We will always wait for a fraction of a second! */
 451         do {
 452                 usleep_range(250, 500);
 453                 status = inb_p(SMBHSTSTS(priv));
 454         } while (((status & SMBHSTSTS_HOST_BUSY) ||
 455                   !(status & (STATUS_ERROR_FLAGS | SMBHSTSTS_INTR))) &&
 456                  (timeout++ < MAX_RETRIES));
 457
 458         if (timeout > MAX_RETRIES) {
 459                 dev_dbg(&priv->pci_dev->dev, "INTR Timeout!\n");
 460                 return -ETIMEDOUT;
 461         }
 462         return status & (STATUS_ERROR_FLAGS | SMBHSTSTS_INTR);
 463 }
 464
 465 /* Wait for either BYTE_DONE or an error flag being set */
 466 static int i801_wait_byte_done(struct i801_priv *priv)
 467 {
 468         int timeout = 0;
 469         int status;
 470
 471         /* We will always wait for a fraction of a second! */
 472         do {
 473                 usleep_range(250, 500);
 474                 status = inb_p(SMBHSTSTS(priv));
 475         } while (!(status & (STATUS_ERROR_FLAGS | SMBHSTSTS_BYTE_DONE)) &&
 476                  (timeout++ < MAX_RETRIES));
 477
 478         if (timeout > MAX_RETRIES) {
 479                 dev_dbg(&priv->pci_dev->dev, "BYTE_DONE Timeout!\n");
 480                 return -ETIMEDOUT;
 481         }
 482         return status & STATUS_ERROR_FLAGS;
 483 }
 484
 485 static int i801_transaction(struct i801_priv *priv, int xact)
 486 {
 487         int status;
 488         int result;
 489         const struct i2c_adapter *adap = &priv->adapter;
 490
 491         result = i801_check_pre(priv);
 492         if (result < 0)
 493                 return result;
 494
 495         if (priv->features & FEATURE_IRQ) {
 496                 outb_p(xact | SMBHSTCNT_INTREN | SMBHSTCNT_START,
 497                        SMBHSTCNT(priv));
 498                 result = wait_event_timeout(priv->waitq,
 499                                             (status = priv->status),
 500                                             adap->timeout);
 501                 if (!result) {
 502                         status = -ETIMEDOUT;
 503                         dev_warn(&priv->pci_dev->dev,
 504                                  "Timeout waiting for interrupt!\n");
 505                 }
 506                 priv->status = 0;
 507                 return i801_check_post(priv, status);
 508         }
 509
 510         /* the current contents of SMBHSTCNT can be overwritten, since PEC,
 511          * SMBSCMD are passed in xact */
 512         outb_p(xact | SMBHSTCNT_START, SMBHSTCNT(priv));
 513
 514         status = i801_wait_intr(priv);
 515         return i801_check_post(priv, status);
 516 }
 517
 518 static int i801_block_transaction_by_block(struct i801_priv *priv,
 519                                            union i2c_smbus_data *data,
 520                                            char read_write, int hwpec)
 521 {
 522         int i, len;
 523         int status;
 524
 525         inb_p(SMBHSTCNT(priv)); /* reset the data buffer index */
 526
 527         /* Use 32-byte buffer to process this transaction */
 528         if (read_write == I2C_SMBUS_WRITE) {
 529                 len = data->block[0];
 530                 outb_p(len, SMBHSTDAT0(priv));
 531                 for (i = 0; i < len; i++)
 532                         outb_p(data->block[i+1], SMBBLKDAT(priv));
 533         }
 534
 535         status = i801_transaction(priv, I801_BLOCK_DATA |
 536                                   (hwpec ? SMBHSTCNT_PEC_EN : 0));
 537         if (status)
 538                 return status;
 539
 540         if (read_write == I2C_SMBUS_READ) {
 541                 len = inb_p(SMBHSTDAT0(priv));
 542                 if (len < 1 || len > I2C_SMBUS_BLOCK_MAX)
 543                         return -EPROTO;
 544
 545                 data->block[0] = len;
 546                 for (i = 0; i < len; i++)
 547                         data->block[i + 1] = inb_p(SMBBLKDAT(priv));
 548         }
 549         return 0;
 550 }
 551
 552 static void i801_isr_byte_done(struct i801_priv *priv)
 553 {
 554         if (priv->is_read) {
 555                 /* For SMBus block reads, length is received with first byte */
 556                 if (((priv->cmd & 0x1c) == I801_BLOCK_DATA) &&
 557                     (priv->count == 0)) {
 558                         priv->len = inb_p(SMBHSTDAT0(priv));
 559                         if (priv->len < 1 || priv->len > I2C_SMBUS_BLOCK_MAX) {
 560                                 dev_err(&priv->pci_dev->dev,
 561                                         "Illegal SMBus block read size %d\n",
 562                                         priv->len);
 563                                 /* FIXME: Recover */
 564                                 priv->len = I2C_SMBUS_BLOCK_MAX;
 565                         } else {
 566                                 dev_dbg(&priv->pci_dev->dev,
 567                                         "SMBus block read size is %d\n",
 568                                         priv->len);
 569                         }
 570                         priv->data[-1] = priv->len;
 571                 }
 572
 573                 /* Read next byte */
 574                 if (priv->count < priv->len)
 575                         priv->data[priv->count++] = inb(SMBBLKDAT(priv));
 576                 else
 577                         dev_dbg(&priv->pci_dev->dev,
 578                                 "Discarding extra byte on block read\n");
 579
 580                 /* Set LAST_BYTE for last byte of read transaction */
 581                 if (priv->count == priv->len - 1)
 582                         outb_p(priv->cmd | SMBHSTCNT_LAST_BYTE,
 583                                SMBHSTCNT(priv));
 584         } else if (priv->count < priv->len - 1) {
 585                 /* Write next byte, except for IRQ after last byte */
 586                 outb_p(priv->data[++priv->count], SMBBLKDAT(priv));
 587         }
 588
 589         /* Clear BYTE_DONE to continue with next byte */
 590         outb_p(SMBHSTSTS_BYTE_DONE, SMBHSTSTS(priv));
 591 }
 592
 593 static irqreturn_t i801_host_notify_isr(struct i801_priv *priv)
 594 {
 595         unsigned short addr;
 596
 597         addr = inb_p(SMBNTFDADD(priv)) >> 1;
 598
 599         /*
 600          * With the tested platforms, reading SMBNTFDDAT (22 + (p)->smba)
 601          * always returns 0. Our current implementation doesn't provide
 602          * data, so we just ignore it.
 603          */
 604         i2c_handle_smbus_host_notify(&priv->adapter, addr);
 605
 606         /* clear Host Notify bit and return */
 607         outb_p(SMBSLVSTS_HST_NTFY_STS, SMBSLVSTS(priv));
 608         return IRQ_HANDLED;
 609 }
 610
 611 /*
 612  * There are three kinds of interrupts:
 613  *
 614  * 1) i801 signals transaction completion with one of these interrupts:
 615  *      INTR - Success
 616  *      DEV_ERR - Invalid command, NAK or communication timeout
 617  *      BUS_ERR - SMI# transaction collision
 618  *      FAILED - transaction was canceled due to a KILL request
 619  *    When any of these occur, update ->status and wake up the waitq.
 620  *    ->status must be cleared before kicking off the next transaction.
 621  *
 622  * 2) For byte-by-byte (I2C read/write) transactions, one BYTE_DONE interrupt
 623  *    occurs for each byte of a byte-by-byte to prepare the next byte.
 624  *
 625  * 3) Host Notify interrupts
 626  */
 627 static irqreturn_t i801_isr(int irq, void *dev_id)
 628 {
 629         struct i801_priv *priv = dev_id;
 630         u16 pcists;
 631         u8 status;
 632
 633         /* Confirm this is our interrupt */
 634         pci_read_config_word(priv->pci_dev, SMBPCISTS, &pcists);
 635         if (!(pcists & SMBPCISTS_INTS))
 636                 return IRQ_NONE;
 637
 638         if (priv->features & FEATURE_HOST_NOTIFY) {
 639                 status = inb_p(SMBSLVSTS(priv));
 640                 if (status & SMBSLVSTS_HST_NTFY_STS)
 641                         return i801_host_notify_isr(priv);
 642         }
 643
 644         status = inb_p(SMBHSTSTS(priv));
 645         if (status & SMBHSTSTS_BYTE_DONE)
 646                 i801_isr_byte_done(priv);
 647
 648         /*
 649          * Clear irq sources and report transaction result.
 650          * ->status must be cleared before the next transaction is started.
 651          */
 652         status &= SMBHSTSTS_INTR | STATUS_ERROR_FLAGS;
 653         if (status) {
 654                 outb_p(status, SMBHSTSTS(priv));
 655                 priv->status = status;
 656                 wake_up(&priv->waitq);
 657         }
 658
 659         return IRQ_HANDLED;
 660 }
 661
 662 /*
 663  * For "byte-by-byte" block transactions:
 664  *   I2C write uses cmd=I801_BLOCK_DATA, I2C_EN=1
 665  *   I2C read uses cmd=I801_I2C_BLOCK_DATA
 666  */
 667 static int i801_block_transaction_byte_by_byte(struct i801_priv *priv,
 668                                                union i2c_smbus_data *data,
 669                                                char read_write, int command,
 670                                                int hwpec)
 671 {
 672         int i, len;
 673         int smbcmd;
 674         int status;
 675         int result;
 676         const struct i2c_adapter *adap = &priv->adapter;
 677
 678         result = i801_check_pre(priv);
 679         if (result < 0)
 680                 return result;
 681
 682         len = data->block[0];
 683
 684         if (read_write == I2C_SMBUS_WRITE) {
 685                 outb_p(len, SMBHSTDAT0(priv));
 686                 outb_p(data->block[1], SMBBLKDAT(priv));
 687         }
 688
 689         if (command == I2C_SMBUS_I2C_BLOCK_DATA &&
 690             read_write == I2C_SMBUS_READ)
 691                 smbcmd = I801_I2C_BLOCK_DATA;
 692         else
 693                 smbcmd = I801_BLOCK_DATA;
 694
 695         if (priv->features & FEATURE_IRQ) {
 696                 priv->is_read = (read_write == I2C_SMBUS_READ);
 697                 if (len == 1 && priv->is_read)
 698                         smbcmd |= SMBHSTCNT_LAST_BYTE;
 699                 priv->cmd = smbcmd | SMBHSTCNT_INTREN;
 700                 priv->len = len;
 701                 priv->count = 0;
 702                 priv->data = &data->block[1];
 703
 704                 outb_p(priv->cmd | SMBHSTCNT_START, SMBHSTCNT(priv));
 705                 result = wait_event_timeout(priv->waitq,
 706                                             (status = priv->status),
 707                                             adap->timeout);
 708                 if (!result) {
 709                         status = -ETIMEDOUT;
 710                         dev_warn(&priv->pci_dev->dev,
 711                                  "Timeout waiting for interrupt!\n");
 712                 }
 713                 priv->status = 0;
 714                 return i801_check_post(priv, status);
 715         }
 716
 717         for (i = 1; i <= len; i++) {
 718                 if (i == len && read_write == I2C_SMBUS_READ)
 719                         smbcmd |= SMBHSTCNT_LAST_BYTE;
 720                 outb_p(smbcmd, SMBHSTCNT(priv));
 721
 722                 if (i == 1)
 723                         outb_p(inb(SMBHSTCNT(priv)) | SMBHSTCNT_START,
 724                                SMBHSTCNT(priv));
 725
 726                 status = i801_wait_byte_done(priv);
 727                 if (status)
 728                         goto exit;
 729
 730                 if (i == 1 && read_write == I2C_SMBUS_READ
 731                  && command != I2C_SMBUS_I2C_BLOCK_DATA) {
 732                         len = inb_p(SMBHSTDAT0(priv));
 733                         if (len < 1 || len > I2C_SMBUS_BLOCK_MAX) {
 734                                 dev_err(&priv->pci_dev->dev,
 735                                         "Illegal SMBus block read size %d\n",
 736                                         len);
 737                                 /* Recover */
 738                                 while (inb_p(SMBHSTSTS(priv)) &
 739                                        SMBHSTSTS_HOST_BUSY)
 740                                         outb_p(SMBHSTSTS_BYTE_DONE,
 741                                                SMBHSTSTS(priv));
 742                                 outb_p(SMBHSTSTS_INTR, SMBHSTSTS(priv));
 743                                 return -EPROTO;
 744                         }
 745                         data->block[0] = len;
 746                 }
 747
 748                 /* Retrieve/store value in SMBBLKDAT */
 749                 if (read_write == I2C_SMBUS_READ)
 750                         data->block[i] = inb_p(SMBBLKDAT(priv));
 751                 if (read_write == I2C_SMBUS_WRITE && i+1 <= len)
 752                         outb_p(data->block[i+1], SMBBLKDAT(priv));
 753
 754                 /* signals SMBBLKDAT ready */
 755                 outb_p(SMBHSTSTS_BYTE_DONE, SMBHSTSTS(priv));
 756         }
 757
 758         status = i801_wait_intr(priv);
 759 exit:
 760         return i801_check_post(priv, status);
 761 }
 762
 763 static int i801_set_block_buffer_mode(struct i801_priv *priv)
 764 {
 765         outb_p(inb_p(SMBAUXCTL(priv)) | SMBAUXCTL_E32B, SMBAUXCTL(priv));
 766         if ((inb_p(SMBAUXCTL(priv)) & SMBAUXCTL_E32B) == 0)
 767                 return -EIO;
 768         return 0;
 769 }
 770
 771 /* Block transaction function */
 772 static int i801_block_transaction(struct i801_priv *priv,
 773                                   union i2c_smbus_data *data, char read_write,
 774                                   int command, int hwpec)
 775 {
 776         int result = 0;
 777         unsigned char hostc;
 778
 779         if (command == I2C_SMBUS_I2C_BLOCK_DATA) {
 780                 if (read_write == I2C_SMBUS_WRITE) {
 781                         /* set I2C_EN bit in configuration register */
 782                         pci_read_config_byte(priv->pci_dev, SMBHSTCFG, &hostc);
 783                         pci_write_config_byte(priv->pci_dev, SMBHSTCFG,
 784                                               hostc | SMBHSTCFG_I2C_EN);
 785                 } else if (!(priv->features & FEATURE_I2C_BLOCK_READ)) {
 786                         dev_err(&priv->pci_dev->dev,
 787                                 "I2C block read is unsupported!\n");
 788                         return -EOPNOTSUPP;
 789                 }
 790         }
 791
 792         if (read_write == I2C_SMBUS_WRITE
 793          || command == I2C_SMBUS_I2C_BLOCK_DATA) {
 794                 if (data->block[0] < 1)
 795                         data->block[0] = 1;
 796                 if (data->block[0] > I2C_SMBUS_BLOCK_MAX)
 797                         data->block[0] = I2C_SMBUS_BLOCK_MAX;
 798         } else {
 799                 data->block[0] = 32;    /* max for SMBus block reads */
 800         }
 801
 802         /* Experience has shown that the block buffer can only be used for
 803            SMBus (not I2C) block transactions, even though the datasheet
 804            doesn't mention this limitation. */
 805         if ((priv->features & FEATURE_BLOCK_BUFFER)
 806          && command != I2C_SMBUS_I2C_BLOCK_DATA
 807          && i801_set_block_buffer_mode(priv) == 0)
 808                 result = i801_block_transaction_by_block(priv, data,
 809                                                          read_write, hwpec);
 810         else
 811                 result = i801_block_transaction_byte_by_byte(priv, data,
 812                                                              read_write,
 813                                                              command, hwpec);
 814
 815         if (command == I2C_SMBUS_I2C_BLOCK_DATA
 816          && read_write == I2C_SMBUS_WRITE) {
 817                 /* restore saved configuration register value */
 818                 pci_write_config_byte(priv->pci_dev, SMBHSTCFG, hostc);
 819         }
 820         return result;
 821 }
 822
 823 /* Return negative errno on error. */
 824 static s32 i801_access(struct i2c_adapter *adap, u16 addr,
 825                        unsigned short flags, char read_write, u8 command,
 826                        int size, union i2c_smbus_data *data)
 827 {
 828         int hwpec;
 829         int block = 0;
 830         int ret = 0, xact = 0;
 831         struct i801_priv *priv = i2c_get_adapdata(adap);
 832
 833         mutex_lock(&priv->acpi_lock);
 834         if (priv->acpi_reserved) {
 835                 mutex_unlock(&priv->acpi_lock);
 836                 return -EBUSY;
 837         }
 838
 839         pm_runtime_get_sync(&priv->pci_dev->dev);
 840
 841         hwpec = (priv->features & FEATURE_SMBUS_PEC) && (flags & I2C_CLIENT_PEC)
 842                 && size != I2C_SMBUS_QUICK
 843                 && size != I2C_SMBUS_I2C_BLOCK_DATA;
 844
 845         switch (size) {
 846         case I2C_SMBUS_QUICK:
 847                 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
 848                        SMBHSTADD(priv));
 849                 xact = I801_QUICK;
 850                 break;
 851         case I2C_SMBUS_BYTE:
 852                 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
 853                        SMBHSTADD(priv));
 854                 if (read_write == I2C_SMBUS_WRITE)
 855                         outb_p(command, SMBHSTCMD(priv));
 856                 xact = I801_BYTE;
 857                 break;
 858         case I2C_SMBUS_BYTE_DATA:
 859                 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
 860                        SMBHSTADD(priv));
 861                 outb_p(command, SMBHSTCMD(priv));
 862                 if (read_write == I2C_SMBUS_WRITE)
 863                         outb_p(data->byte, SMBHSTDAT0(priv));
 864                 xact = I801_BYTE_DATA;
 865                 break;
 866         case I2C_SMBUS_WORD_DATA:
 867                 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
 868                        SMBHSTADD(priv));
 869                 outb_p(command, SMBHSTCMD(priv));
 870                 if (read_write == I2C_SMBUS_WRITE) {
 871                         outb_p(data->word & 0xff, SMBHSTDAT0(priv));
 872                         outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1(priv));
 873                 }
 874                 xact = I801_WORD_DATA;
 875                 break;
 876         case I2C_SMBUS_BLOCK_DATA:
 877                 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
 878                        SMBHSTADD(priv));
 879                 outb_p(command, SMBHSTCMD(priv));
 880                 block = 1;
 881                 break;
 882         case I2C_SMBUS_I2C_BLOCK_DATA:
 883                 /*
 884                  * NB: page 240 of ICH5 datasheet shows that the R/#W
 885                  * bit should be cleared here, even when reading.
 886                  * However if SPD Write Disable is set (Lynx Point and later),
 887                  * the read will fail if we don't set the R/#W bit.
 888                  */
 889                 outb_p(((addr & 0x7f) << 1) |
 890                        ((priv->original_hstcfg & SMBHSTCFG_SPD_WD) ?
 891                         (read_write & 0x01) : 0),
 892                        SMBHSTADD(priv));
 893                 if (read_write == I2C_SMBUS_READ) {
 894                         /* NB: page 240 of ICH5 datasheet also shows
 895                          * that DATA1 is the cmd field when reading */
 896                         outb_p(command, SMBHSTDAT1(priv));
 897                 } else
 898                         outb_p(command, SMBHSTCMD(priv));
 899                 block = 1;
 900                 break;
 901         default:
 902                 dev_err(&priv->pci_dev->dev, "Unsupported transaction %d\n",
 903                         size);
 904                 ret = -EOPNOTSUPP;
 905                 goto out;
 906         }
 907
 908         if (hwpec)      /* enable/disable hardware PEC */
 909                 outb_p(inb_p(SMBAUXCTL(priv)) | SMBAUXCTL_CRC, SMBAUXCTL(priv));
 910         else
 911                 outb_p(inb_p(SMBAUXCTL(priv)) & (~SMBAUXCTL_CRC),
 912                        SMBAUXCTL(priv));
 913
 914         if (block)
 915                 ret = i801_block_transaction(priv, data, read_write, size,
 916                                              hwpec);
 917         else
 918                 ret = i801_transaction(priv, xact);
 919
 920         /* Some BIOSes don't like it when PEC is enabled at reboot or resume
 921            time, so we forcibly disable it after every transaction. Turn off
 922            E32B for the same reason. */
 923         if (hwpec || block)
 924                 outb_p(inb_p(SMBAUXCTL(priv)) &
 925                        ~(SMBAUXCTL_CRC | SMBAUXCTL_E32B), SMBAUXCTL(priv));
 926
 927         if (block)
 928                 goto out;
 929         if (ret)
 930                 goto out;
 931         if ((read_write == I2C_SMBUS_WRITE) || (xact == I801_QUICK))
 932                 goto out;
 933
 934         switch (xact & 0x7f) {
 935         case I801_BYTE: /* Result put in SMBHSTDAT0 */
 936         case I801_BYTE_DATA:
 937                 data->byte = inb_p(SMBHSTDAT0(priv));
 938                 break;
 939         case I801_WORD_DATA:
 940                 data->word = inb_p(SMBHSTDAT0(priv)) +
 941                              (inb_p(SMBHSTDAT1(priv)) << 8);
 942                 break;
 943         }
 944
 945 out:
 946         pm_runtime_mark_last_busy(&priv->pci_dev->dev);
 947         pm_runtime_put_autosuspend(&priv->pci_dev->dev);
 948         mutex_unlock(&priv->acpi_lock);
 949         return ret;
 950 }
 951
 952
 953 static u32 i801_func(struct i2c_adapter *adapter)
 954 {
 955         struct i801_priv *priv = i2c_get_adapdata(adapter);
 956
 957         return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
 958                I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
 959                I2C_FUNC_SMBUS_BLOCK_DATA | I2C_FUNC_SMBUS_WRITE_I2C_BLOCK |
 960                ((priv->features & FEATURE_SMBUS_PEC) ? I2C_FUNC_SMBUS_PEC : 0) |
 961                ((priv->features & FEATURE_I2C_BLOCK_READ) ?
 962                 I2C_FUNC_SMBUS_READ_I2C_BLOCK : 0) |
 963                ((priv->features & FEATURE_HOST_NOTIFY) ?
 964                 I2C_FUNC_SMBUS_HOST_NOTIFY : 0);
 965 }
 966
 967 static void i801_enable_host_notify(struct i2c_adapter *adapter)
 968 {
 969         struct i801_priv *priv = i2c_get_adapdata(adapter);
 970
 971         if (!(priv->features & FEATURE_HOST_NOTIFY))
 972                 return;
 973
 974         if (!(SMBSLVCMD_HST_NTFY_INTREN & priv->original_slvcmd))
 975                 outb_p(SMBSLVCMD_HST_NTFY_INTREN | priv->original_slvcmd,
 976                        SMBSLVCMD(priv));
 977
 978         /* clear Host Notify bit to allow a new notification */
 979         outb_p(SMBSLVSTS_HST_NTFY_STS, SMBSLVSTS(priv));
 980 }
 981
 982 static void i801_disable_host_notify(struct i801_priv *priv)
 983 {
 984         if (!(priv->features & FEATURE_HOST_NOTIFY))
 985                 return;
 986
 987         outb_p(priv->original_slvcmd, SMBSLVCMD(priv));
 988 }
 989
 990 static const struct i2c_algorithm smbus_algorithm = {
 991         .smbus_xfer     = i801_access,
 992         .functionality  = i801_func,
 993 };
 994
 995 static const struct pci_device_id i801_ids[] = {
 996         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801AA_3) },
 997         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801AB_3) },
 998         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_2) },
 999         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_3) },
1000         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_3) },
1001         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_3) },
1002         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB_4) },
1003         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_16) },
1004         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_17) },
1005         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB2_17) },
1006         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH8_5) },
1007         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH9_6) },
1008         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_EP80579_1) },
1009         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH10_4) },
1010         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH10_5) },
1011         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5_3400_SERIES_SMBUS) },
1012         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_COUGARPOINT_SMBUS) },
1013         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS) },
1014         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF0) },
1015         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF1) },
1016         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF2) },
1017         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_DH89XXCC_SMBUS) },
1018         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_PANTHERPOINT_SMBUS) },
1019         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_LYNXPOINT_SMBUS) },
1020         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_LYNXPOINT_LP_SMBUS) },
1021         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_AVOTON_SMBUS) },
1022         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS) },
1023         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS0) },
1024         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS1) },
1025         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS2) },
1026         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_COLETOCREEK_SMBUS) },
1027         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_GEMINILAKE_SMBUS) },
1028         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_WILDCATPOINT_SMBUS) },
1029         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_WILDCATPOINT_LP_SMBUS) },
1030         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_BAYTRAIL_SMBUS) },
1031         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_BRASWELL_SMBUS) },
1032         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_SUNRISEPOINT_H_SMBUS) },
1033         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_SUNRISEPOINT_LP_SMBUS) },
1034         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_CDF_SMBUS) },
1035         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_DNV_SMBUS) },
1036         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_BROXTON_SMBUS) },
1037         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_LEWISBURG_SMBUS) },
1038         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_LEWISBURG_SSKU_SMBUS) },
1039         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_KABYLAKE_PCH_H_SMBUS) },
1040         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_CANNONLAKE_H_SMBUS) },
1041         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_CANNONLAKE_LP_SMBUS) },
1042         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICELAKE_LP_SMBUS) },
1043         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_COMETLAKE_SMBUS) },
1044         { 0, }
1045 };
1046
1047 MODULE_DEVICE_TABLE(pci, i801_ids);
1048
1049 #if defined CONFIG_X86 && defined CONFIG_DMI
1050 static unsigned char apanel_addr;
1051
1052 /* Scan the system ROM for the signature "FJKEYINF" */
1053 static __init const void __iomem *bios_signature(const void __iomem *bios)
1054 {
1055         ssize_t offset;
1056         const unsigned char signature[] = "FJKEYINF";
1057
1058         for (offset = 0; offset < 0x10000; offset += 0x10) {
1059                 if (check_signature(bios + offset, signature,
1060                                     sizeof(signature)-1))
1061                         return bios + offset;
1062         }
1063         return NULL;
1064 }
1065
1066 static void __init input_apanel_init(void)
1067 {
1068         void __iomem *bios;
1069         const void __iomem *p;
1070
1071         bios = ioremap(0xF0000, 0x10000); /* Can't fail */
1072         p = bios_signature(bios);
1073         if (p) {
1074                 /* just use the first address */
1075                 apanel_addr = readb(p + 8 + 3) >> 1;
1076         }
1077         iounmap(bios);
1078 }
1079
1080 struct dmi_onboard_device_info {
1081         const char *name;
1082         u8 type;
1083         unsigned short i2c_addr;
1084         const char *i2c_type;
1085 };
1086
1087 static const struct dmi_onboard_device_info dmi_devices[] = {
1088         { "Syleus", DMI_DEV_TYPE_OTHER, 0x73, "fscsyl" },
1089         { "Hermes", DMI_DEV_TYPE_OTHER, 0x73, "fscher" },
1090         { "Hades",  DMI_DEV_TYPE_OTHER, 0x73, "fschds" },
1091 };
1092
1093 static void dmi_check_onboard_device(u8 type, const char *name,
1094                                      struct i2c_adapter *adap)
1095 {
1096         int i;
1097         struct i2c_board_info info;
1098
1099         for (i = 0; i < ARRAY_SIZE(dmi_devices); i++) {
1100                 /* & ~0x80, ignore enabled/disabled bit */
1101                 if ((type & ~0x80) != dmi_devices[i].type)
1102                         continue;
1103                 if (strcasecmp(name, dmi_devices[i].name))
1104                         continue;
1105
1106                 memset(&info, 0, sizeof(struct i2c_board_info));
1107                 info.addr = dmi_devices[i].i2c_addr;
1108                 strlcpy(info.type, dmi_devices[i].i2c_type, I2C_NAME_SIZE);
1109                 i2c_new_device(adap, &info);
1110                 break;
1111         }
1112 }
1113
1114 /* We use our own function to check for onboard devices instead of
1115    dmi_find_device() as some buggy BIOS's have the devices we are interested
1116    in marked as disabled */
1117 static void dmi_check_onboard_devices(const struct dmi_header *dm, void *adap)
1118 {
1119         int i, count;
1120
1121         if (dm->type != 10)
1122                 return;
1123
1124         count = (dm->length - sizeof(struct dmi_header)) / 2;
1125         for (i = 0; i < count; i++) {
1126                 const u8 *d = (char *)(dm + 1) + (i * 2);
1127                 const char *name = ((char *) dm) + dm->length;
1128                 u8 type = d[0];
1129                 u8 s = d[1];
1130
1131                 if (!s)
1132                         continue;
1133                 s--;
1134                 while (s > 0 && name[0]) {
1135                         name += strlen(name) + 1;
1136                         s--;
1137                 }
1138                 if (name[0] == 0) /* Bogus string reference */
1139                         continue;
1140
1141                 dmi_check_onboard_device(type, name, adap);
1142         }
1143 }
1144
1145 /* NOTE: Keep this list in sync with drivers/platform/x86/dell-smo8800.c */
1146 static const char *const acpi_smo8800_ids[] = {
1147         "SMO8800",
1148         "SMO8801",
1149         "SMO8810",
1150         "SMO8811",
1151         "SMO8820",
1152         "SMO8821",
1153         "SMO8830",
1154         "SMO8831",
1155 };
1156
1157 static acpi_status check_acpi_smo88xx_device(acpi_handle obj_handle,
1158                                              u32 nesting_level,
1159                                              void *context,
1160                                              void **return_value)
1161 {
1162         struct acpi_device_info *info;
1163         acpi_status status;
1164         char *hid;
1165         int i;
1166
1167         status = acpi_get_object_info(obj_handle, &info);
1168         if (!ACPI_SUCCESS(status) || !(info->valid & ACPI_VALID_HID))
1169                 return AE_OK;
1170
1171         hid = info->hardware_id.string;
1172         if (!hid)
1173                 return AE_OK;
1174
1175         for (i = 0; i < ARRAY_SIZE(acpi_smo8800_ids); ++i) {
1176                 if (strcmp(hid, acpi_smo8800_ids[i]) == 0) {
1177                         *((bool *)return_value) = true;
1178                         return AE_CTRL_TERMINATE;
1179                 }
1180         }
1181
1182         return AE_OK;
1183 }
1184
1185 static bool is_dell_system_with_lis3lv02d(void)
1186 {
1187         bool found;
1188         const char *vendor;
1189
1190         vendor = dmi_get_system_info(DMI_SYS_VENDOR);
1191         if (strcmp(vendor, "Dell Inc.") != 0)
1192                 return false;
1193
1194         /*
1195          * Check that ACPI device SMO88xx is present and is functioning.
1196          * Function acpi_get_devices() already filters all ACPI devices
1197          * which are not present or are not functioning.
1198          * ACPI device SMO88xx represents our ST microelectronics lis3lv02d
1199          * accelerometer but unfortunately ACPI does not provide any other
1200          * information (like I2C address).
1201          */
1202         found = false;
1203         acpi_get_devices(NULL, check_acpi_smo88xx_device, NULL,
1204                          (void **)&found);
1205
1206         return found;
1207 }
1208
1209 /*
1210  * Accelerometer's I2C address is not specified in DMI nor ACPI,
1211  * so it is needed to define mapping table based on DMI product names.
1212  */
1213 static const struct {
1214         const char *dmi_product_name;
1215         unsigned short i2c_addr;
1216 } dell_lis3lv02d_devices[] = {
1217         /*
1218          * Dell platform team told us that these Latitude devices have
1219          * ST microelectronics accelerometer at I2C address 0x29.
1220          */
1221         { "Latitude E5250",     0x29 },
1222         { "Latitude E5450",     0x29 },
1223         { "Latitude E5550",     0x29 },
1224         { "Latitude E6440",     0x29 },
1225         { "Latitude E6440 ATG", 0x29 },
1226         { "Latitude E6540",     0x29 },
1227         /*
1228          * Additional individual entries were added after verification.
1229          */
1230         { "Vostro V131",        0x1d },
1231 };
1232
1233 static void register_dell_lis3lv02d_i2c_device(struct i801_priv *priv)
1234 {
1235         struct i2c_board_info info;
1236         const char *dmi_product_name;
1237         int i;
1238
1239         dmi_product_name = dmi_get_system_info(DMI_PRODUCT_NAME);
1240         for (i = 0; i < ARRAY_SIZE(dell_lis3lv02d_devices); ++i) {
1241                 if (strcmp(dmi_product_name,
1242                            dell_lis3lv02d_devices[i].dmi_product_name) == 0)
1243                         break;
1244         }
1245
1246         if (i == ARRAY_SIZE(dell_lis3lv02d_devices)) {
1247                 dev_warn(&priv->pci_dev->dev,
1248                          "Accelerometer lis3lv02d is present on SMBus but its"
1249                          " address is unknown, skipping registration\n");
1250                 return;
1251         }
1252
1253         memset(&info, 0, sizeof(struct i2c_board_info));
1254         info.addr = dell_lis3lv02d_devices[i].i2c_addr;
1255         strlcpy(info.type, "lis3lv02d", I2C_NAME_SIZE);
1256         i2c_new_device(&priv->adapter, &info);
1257 }
1258
1259 /* Register optional slaves */
1260 static void i801_probe_optional_slaves(struct i801_priv *priv)
1261 {
1262         /* Only register slaves on main SMBus channel */
1263         if (priv->features & FEATURE_IDF)
1264                 return;
1265
1266         if (apanel_addr) {
1267                 struct i2c_board_info info;
1268
1269                 memset(&info, 0, sizeof(struct i2c_board_info));
1270                 info.addr = apanel_addr;
1271                 strlcpy(info.type, "fujitsu_apanel", I2C_NAME_SIZE);
1272                 i2c_new_device(&priv->adapter, &info);
1273         }
1274
1275         if (dmi_name_in_vendors("FUJITSU"))
1276                 dmi_walk(dmi_check_onboard_devices, &priv->adapter);
1277
1278         if (is_dell_system_with_lis3lv02d())
1279                 register_dell_lis3lv02d_i2c_device(priv);
1280 }
1281 #else
1282 static void __init input_apanel_init(void) {}
1283 static void i801_probe_optional_slaves(struct i801_priv *priv) {}
1284 #endif  /* CONFIG_X86 && CONFIG_DMI */
1285
1286 #if IS_ENABLED(CONFIG_I2C_MUX_GPIO) && defined CONFIG_DMI
1287 static struct i801_mux_config i801_mux_config_asus_z8_d12 = {
1288         .gpio_chip = "gpio_ich",
1289         .values = { 0x02, 0x03 },
1290         .n_values = 2,
1291         .classes = { I2C_CLASS_SPD, I2C_CLASS_SPD },
1292         .gpios = { 52, 53 },
1293         .n_gpios = 2,
1294 };
1295
1296 static struct i801_mux_config i801_mux_config_asus_z8_d18 = {
1297         .gpio_chip = "gpio_ich",
1298         .values = { 0x02, 0x03, 0x01 },
1299         .n_values = 3,
1300         .classes = { I2C_CLASS_SPD, I2C_CLASS_SPD, I2C_CLASS_SPD },
1301         .gpios = { 52, 53 },
1302         .n_gpios = 2,
1303 };
1304
1305 static const struct dmi_system_id mux_dmi_table[] = {
1306         {
1307                 .matches = {
1308                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1309                         DMI_MATCH(DMI_BOARD_NAME, "Z8NA-D6(C)"),
1310                 },
1311                 .driver_data = &i801_mux_config_asus_z8_d12,
1312         },
1313         {
1314                 .matches = {
1315                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1316                         DMI_MATCH(DMI_BOARD_NAME, "Z8P(N)E-D12(X)"),
1317                 },
1318                 .driver_data = &i801_mux_config_asus_z8_d12,
1319         },
1320         {
1321                 .matches = {
1322                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1323                         DMI_MATCH(DMI_BOARD_NAME, "Z8NH-D12"),
1324                 },
1325                 .driver_data = &i801_mux_config_asus_z8_d12,
1326         },
1327         {
1328                 .matches = {
1329                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1330                         DMI_MATCH(DMI_BOARD_NAME, "Z8PH-D12/IFB"),
1331                 },
1332                 .driver_data = &i801_mux_config_asus_z8_d12,
1333         },
1334         {
1335                 .matches = {
1336                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1337                         DMI_MATCH(DMI_BOARD_NAME, "Z8NR-D12"),
1338                 },
1339                 .driver_data = &i801_mux_config_asus_z8_d12,
1340         },
1341         {
1342                 .matches = {
1343                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1344                         DMI_MATCH(DMI_BOARD_NAME, "Z8P(N)H-D12"),
1345                 },
1346                 .driver_data = &i801_mux_config_asus_z8_d12,
1347         },
1348         {
1349                 .matches = {
1350                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1351                         DMI_MATCH(DMI_BOARD_NAME, "Z8PG-D18"),
1352                 },
1353                 .driver_data = &i801_mux_config_asus_z8_d18,
1354         },
1355         {
1356                 .matches = {
1357                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1358                         DMI_MATCH(DMI_BOARD_NAME, "Z8PE-D18"),
1359                 },
1360                 .driver_data = &i801_mux_config_asus_z8_d18,
1361         },
1362         {
1363                 .matches = {
1364                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
1365                         DMI_MATCH(DMI_BOARD_NAME, "Z8PS-D12"),
1366                 },
1367                 .driver_data = &i801_mux_config_asus_z8_d12,
1368         },
1369         { }
1370 };
1371
1372 /* Setup multiplexing if needed */
1373 static int i801_add_mux(struct i801_priv *priv)
1374 {
1375         struct device *dev = &priv->adapter.dev;
1376         const struct i801_mux_config *mux_config;
1377         struct i2c_mux_gpio_platform_data gpio_data;
1378         int err;
1379
1380         if (!priv->mux_drvdata)
1381                 return 0;
1382         mux_config = priv->mux_drvdata;
1383
1384         /* Prepare the platform data */
1385         memset(&gpio_data, 0, sizeof(struct i2c_mux_gpio_platform_data));
1386         gpio_data.parent = priv->adapter.nr;
1387         gpio_data.values = mux_config->values;
1388         gpio_data.n_values = mux_config->n_values;
1389         gpio_data.classes = mux_config->classes;
1390         gpio_data.gpio_chip = mux_config->gpio_chip;
1391         gpio_data.gpios = mux_config->gpios;
1392         gpio_data.n_gpios = mux_config->n_gpios;
1393         gpio_data.idle = I2C_MUX_GPIO_NO_IDLE;
1394
1395         /* Register the mux device */
1396         priv->mux_pdev = platform_device_register_data(dev, "i2c-mux-gpio",
1397                                 PLATFORM_DEVID_AUTO, &gpio_data,
1398                                 sizeof(struct i2c_mux_gpio_platform_data));
1399         if (IS_ERR(priv->mux_pdev)) {
1400                 err = PTR_ERR(priv->mux_pdev);
1401                 priv->mux_pdev = NULL;
1402                 dev_err(dev, "Failed to register i2c-mux-gpio device\n");
1403                 return err;
1404         }
1405
1406         return 0;
1407 }
1408
1409 static void i801_del_mux(struct i801_priv *priv)
1410 {
1411         if (priv->mux_pdev)
1412                 platform_device_unregister(priv->mux_pdev);
1413 }
1414
1415 static unsigned int i801_get_adapter_class(struct i801_priv *priv)
1416 {
1417         const struct dmi_system_id *id;
1418         const struct i801_mux_config *mux_config;
1419         unsigned int class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
1420         int i;
1421
1422         id = dmi_first_match(mux_dmi_table);
1423         if (id) {
1424                 /* Remove branch classes from trunk */
1425                 mux_config = id->driver_data;
1426                 for (i = 0; i < mux_config->n_values; i++)
1427                         class &= ~mux_config->classes[i];
1428
1429                 /* Remember for later */
1430                 priv->mux_drvdata = mux_config;
1431         }
1432
1433         return class;
1434 }
1435 #else
1436 static inline int i801_add_mux(struct i801_priv *priv) { return 0; }
1437 static inline void i801_del_mux(struct i801_priv *priv) { }
1438
1439 static inline unsigned int i801_get_adapter_class(struct i801_priv *priv)
1440 {
1441         return I2C_CLASS_HWMON | I2C_CLASS_SPD;
1442 }
1443 #endif
1444
1445 static const struct itco_wdt_platform_data tco_platform_data = {
1446         .name = "Intel PCH",
1447         .version = 4,
1448 };
1449
1450 static DEFINE_SPINLOCK(p2sb_spinlock);
1451
1452 static void i801_add_tco(struct i801_priv *priv)
1453 {
1454         struct pci_dev *pci_dev = priv->pci_dev;
1455         struct resource tco_res[3], *res;
1456         struct platform_device *pdev;
1457         unsigned int devfn;
1458         u32 tco_base, tco_ctl;
1459         u32 base_addr, ctrl_val;
1460         u64 base64_addr;
1461         u8 hidden;
1462
1463         if (!(priv->features & FEATURE_TCO))
1464                 return;
1465
1466         pci_read_config_dword(pci_dev, TCOBASE, &tco_base);
1467         pci_read_config_dword(pci_dev, TCOCTL, &tco_ctl);
1468         if (!(tco_ctl & TCOCTL_EN))
1469                 return;
1470
1471         memset(tco_res, 0, sizeof(tco_res));
1472
1473         res = &tco_res[ICH_RES_IO_TCO];
1474         res->start = tco_base & ~1;
1475         res->end = res->start + 32 - 1;
1476         res->flags = IORESOURCE_IO;
1477
1478         /*
1479          * Power Management registers.
1480          */
1481         devfn = PCI_DEVFN(PCI_SLOT(pci_dev->devfn), 2);
1482         pci_bus_read_config_dword(pci_dev->bus, devfn, ACPIBASE, &base_addr);
1483
1484         res = &tco_res[ICH_RES_IO_SMI];
1485         res->start = (base_addr & ~1) + ACPIBASE_SMI_OFF;
1486         res->end = res->start + 3;
1487         res->flags = IORESOURCE_IO;
1488
1489         /*
1490          * Enable the ACPI I/O space.
1491          */
1492         pci_bus_read_config_dword(pci_dev->bus, devfn, ACPICTRL, &ctrl_val);
1493         ctrl_val |= ACPICTRL_EN;
1494         pci_bus_write_config_dword(pci_dev->bus, devfn, ACPICTRL, ctrl_val);
1495
1496         /*
1497          * We must access the NO_REBOOT bit over the Primary to Sideband
1498          * bridge (P2SB). The BIOS prevents the P2SB device from being
1499          * enumerated by the PCI subsystem, so we need to unhide/hide it
1500          * to lookup the P2SB BAR.
1501          */
1502         spin_lock(&p2sb_spinlock);
1503
1504         devfn = PCI_DEVFN(PCI_SLOT(pci_dev->devfn), 1);
1505
1506         /* Unhide the P2SB device, if it is hidden */
1507         pci_bus_read_config_byte(pci_dev->bus, devfn, 0xe1, &hidden);
1508         if (hidden)
1509                 pci_bus_write_config_byte(pci_dev->bus, devfn, 0xe1, 0x0);
1510
1511         pci_bus_read_config_dword(pci_dev->bus, devfn, SBREG_BAR, &base_addr);
1512         base64_addr = base_addr & 0xfffffff0;
1513
1514         pci_bus_read_config_dword(pci_dev->bus, devfn, SBREG_BAR + 0x4, &base_addr);
1515         base64_addr |= (u64)base_addr << 32;
1516
1517         /* Hide the P2SB device, if it was hidden before */
1518         if (hidden)
1519                 pci_bus_write_config_byte(pci_dev->bus, devfn, 0xe1, hidden);
1520         spin_unlock(&p2sb_spinlock);
1521
1522         res = &tco_res[ICH_RES_MEM_OFF];
1523         if (pci_dev->device == PCI_DEVICE_ID_INTEL_DNV_SMBUS)
1524                 res->start = (resource_size_t)base64_addr + SBREG_SMBCTRL_DNV;
1525         else
1526                 res->start = (resource_size_t)base64_addr + SBREG_SMBCTRL;
1527
1528         res->end = res->start + 3;
1529         res->flags = IORESOURCE_MEM;
1530
1531         pdev = platform_device_register_resndata(&pci_dev->dev, "iTCO_wdt", -1,
1532                                                  tco_res, 3, &tco_platform_data,
1533                                                  sizeof(tco_platform_data));
1534         if (IS_ERR(pdev)) {
1535                 dev_warn(&pci_dev->dev, "failed to create iTCO device\n");
1536                 return;
1537         }
1538
1539         priv->tco_pdev = pdev;
1540 }
1541
1542 #ifdef CONFIG_ACPI
1543 static bool i801_acpi_is_smbus_ioport(const struct i801_priv *priv,
1544                                       acpi_physical_address address)
1545 {
1546         return address >= priv->smba &&
1547                address <= pci_resource_end(priv->pci_dev, SMBBAR);
1548 }
1549
1550 static acpi_status
1551 i801_acpi_io_handler(u32 function, acpi_physical_address address, u32 bits,
1552                      u64 *value, void *handler_context, void *region_context)
1553 {
1554         struct i801_priv *priv = handler_context;
1555         struct pci_dev *pdev = priv->pci_dev;
1556         acpi_status status;
1557
1558         /*
1559          * Once BIOS AML code touches the OpRegion we warn and inhibit any
1560          * further access from the driver itself. This device is now owned
1561          * by the system firmware.
1562          */
1563         mutex_lock(&priv->acpi_lock);
1564
1565         if (!priv->acpi_reserved && i801_acpi_is_smbus_ioport(priv, address)) {
1566                 priv->acpi_reserved = true;
1567
1568                 dev_warn(&pdev->dev, "BIOS is accessing SMBus registers\n");
1569                 dev_warn(&pdev->dev, "Driver SMBus register access inhibited\n");
1570
1571                 /*
1572                  * BIOS is accessing the host controller so prevent it from
1573                  * suspending automatically from now on.
1574                  */
1575                 pm_runtime_get_sync(&pdev->dev);
1576         }
1577
1578         if ((function & ACPI_IO_MASK) == ACPI_READ)
1579                 status = acpi_os_read_port(address, (u32 *)value, bits);
1580         else
1581                 status = acpi_os_write_port(address, (u32)*value, bits);
1582
1583         mutex_unlock(&priv->acpi_lock);
1584
1585         return status;
1586 }
1587
1588 static int i801_acpi_probe(struct i801_priv *priv)
1589 {
1590         struct acpi_device *adev;
1591         acpi_status status;
1592
1593         adev = ACPI_COMPANION(&priv->pci_dev->dev);
1594         if (adev) {
1595                 status = acpi_install_address_space_handler(adev->handle,
1596                                 ACPI_ADR_SPACE_SYSTEM_IO, i801_acpi_io_handler,
1597                                 NULL, priv);
1598                 if (ACPI_SUCCESS(status))
1599                         return 0;
1600         }
1601
1602         return acpi_check_resource_conflict(&priv->pci_dev->resource[SMBBAR]);
1603 }
1604
1605 static void i801_acpi_remove(struct i801_priv *priv)
1606 {
1607         struct acpi_device *adev;
1608
1609         adev = ACPI_COMPANION(&priv->pci_dev->dev);
1610         if (!adev)
1611                 return;
1612
1613         acpi_remove_address_space_handler(adev->handle,
1614                 ACPI_ADR_SPACE_SYSTEM_IO, i801_acpi_io_handler);
1615
1616         mutex_lock(&priv->acpi_lock);
1617         if (priv->acpi_reserved)
1618                 pm_runtime_put(&priv->pci_dev->dev);
1619         mutex_unlock(&priv->acpi_lock);
1620 }
1621 #else
1622 static inline int i801_acpi_probe(struct i801_priv *priv) { return 0; }
1623 static inline void i801_acpi_remove(struct i801_priv *priv) { }
1624 #endif
1625
1626 static int i801_probe(struct pci_dev *dev, const struct pci_device_id *id)
1627 {
1628         unsigned char temp;
1629         int err, i;
1630         struct i801_priv *priv;
1631
1632         priv = devm_kzalloc(&dev->dev, sizeof(*priv), GFP_KERNEL);
1633         if (!priv)
1634                 return -ENOMEM;
1635
1636         i2c_set_adapdata(&priv->adapter, priv);
1637         priv->adapter.owner = THIS_MODULE;
1638         priv->adapter.class = i801_get_adapter_class(priv);
1639         priv->adapter.algo = &smbus_algorithm;
1640         priv->adapter.dev.parent = &dev->dev;
1641         ACPI_COMPANION_SET(&priv->adapter.dev, ACPI_COMPANION(&dev->dev));
1642         priv->adapter.retries = 3;
1643         mutex_init(&priv->acpi_lock);
1644
1645         priv->pci_dev = dev;
1646         switch (dev->device) {
1647         case PCI_DEVICE_ID_INTEL_SUNRISEPOINT_H_SMBUS:
1648         case PCI_DEVICE_ID_INTEL_SUNRISEPOINT_LP_SMBUS:
1649         case PCI_DEVICE_ID_INTEL_CANNONLAKE_H_SMBUS:
1650         case PCI_DEVICE_ID_INTEL_CANNONLAKE_LP_SMBUS:
1651         case PCI_DEVICE_ID_INTEL_LEWISBURG_SMBUS:
1652         case PCI_DEVICE_ID_INTEL_LEWISBURG_SSKU_SMBUS:
1653         case PCI_DEVICE_ID_INTEL_CDF_SMBUS:
1654         case PCI_DEVICE_ID_INTEL_DNV_SMBUS:
1655         case PCI_DEVICE_ID_INTEL_KABYLAKE_PCH_H_SMBUS:
1656         case PCI_DEVICE_ID_INTEL_ICELAKE_LP_SMBUS:
1657         case PCI_DEVICE_ID_INTEL_COMETLAKE_SMBUS:
1658                 priv->features |= FEATURE_I2C_BLOCK_READ;
1659                 priv->features |= FEATURE_IRQ;
1660                 priv->features |= FEATURE_SMBUS_PEC;
1661                 priv->features |= FEATURE_BLOCK_BUFFER;
1662                 /* If we have ACPI based watchdog use that instead */
1663                 if (!acpi_has_watchdog())
1664                         priv->features |= FEATURE_TCO;
1665                 priv->features |= FEATURE_HOST_NOTIFY;
1666                 break;
1667
1668         case PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF0:
1669         case PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF1:
1670         case PCI_DEVICE_ID_INTEL_PATSBURG_SMBUS_IDF2:
1671         case PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS0:
1672         case PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS1:
1673         case PCI_DEVICE_ID_INTEL_WELLSBURG_SMBUS_MS2:
1674                 priv->features |= FEATURE_IDF;
1675                 /* fall through */
1676         default:
1677                 priv->features |= FEATURE_I2C_BLOCK_READ;
1678                 priv->features |= FEATURE_IRQ;
1679                 /* fall through */
1680         case PCI_DEVICE_ID_INTEL_82801DB_3:
1681                 priv->features |= FEATURE_SMBUS_PEC;
1682                 priv->features |= FEATURE_BLOCK_BUFFER;
1683                 /* fall through */
1684         case PCI_DEVICE_ID_INTEL_82801CA_3:
1685                 priv->features |= FEATURE_HOST_NOTIFY;
1686                 /* fall through */
1687         case PCI_DEVICE_ID_INTEL_82801BA_2:
1688         case PCI_DEVICE_ID_INTEL_82801AB_3:
1689         case PCI_DEVICE_ID_INTEL_82801AA_3:
1690                 break;
1691         }
1692
1693         /* Disable features on user request */
1694         for (i = 0; i < ARRAY_SIZE(i801_feature_names); i++) {
1695                 if (priv->features & disable_features & (1 << i))
1696                         dev_notice(&dev->dev, "%s disabled by user\n",
1697                                    i801_feature_names[i]);
1698         }
1699         priv->features &= ~disable_features;
1700
1701         err = pcim_enable_device(dev);
1702         if (err) {
1703                 dev_err(&dev->dev, "Failed to enable SMBus PCI device (%d)\n",
1704                         err);
1705                 return err;
1706         }
1707         pcim_pin_device(dev);
1708
1709         /* Determine the address of the SMBus area */
1710         priv->smba = pci_resource_start(dev, SMBBAR);
1711         if (!priv->smba) {
1712                 dev_err(&dev->dev,
1713                         "SMBus base address uninitialized, upgrade BIOS\n");
1714                 return -ENODEV;
1715         }
1716
1717         if (i801_acpi_probe(priv))
1718                 return -ENODEV;
1719
1720         err = pcim_iomap_regions(dev, 1 << SMBBAR,
1721                                  dev_driver_string(&dev->dev));
1722         if (err) {
1723                 dev_err(&dev->dev,
1724                         "Failed to request SMBus region 0x%lx-0x%Lx\n",
1725                         priv->smba,
1726                         (unsigned long long)pci_resource_end(dev, SMBBAR));
1727                 i801_acpi_remove(priv);
1728                 return err;
1729         }
1730
1731         pci_read_config_byte(priv->pci_dev, SMBHSTCFG, &temp);
1732         priv->original_hstcfg = temp;
1733         temp &= ~SMBHSTCFG_I2C_EN;      /* SMBus timing */
1734         if (!(temp & SMBHSTCFG_HST_EN)) {
1735                 dev_info(&dev->dev, "Enabling SMBus device\n");
1736                 temp |= SMBHSTCFG_HST_EN;
1737         }
1738         pci_write_config_byte(priv->pci_dev, SMBHSTCFG, temp);
1739
1740         if (temp & SMBHSTCFG_SMB_SMI_EN) {
1741                 dev_dbg(&dev->dev, "SMBus using interrupt SMI#\n");
1742                 /* Disable SMBus interrupt feature if SMBus using SMI# */
1743                 priv->features &= ~FEATURE_IRQ;
1744         }
1745         if (temp & SMBHSTCFG_SPD_WD)
1746                 dev_info(&dev->dev, "SPD Write Disable is set\n");
1747
1748         /* Clear special mode bits */
1749         if (priv->features & (FEATURE_SMBUS_PEC | FEATURE_BLOCK_BUFFER))
1750                 outb_p(inb_p(SMBAUXCTL(priv)) &
1751                        ~(SMBAUXCTL_CRC | SMBAUXCTL_E32B), SMBAUXCTL(priv));
1752
1753         /* Remember original Host Notify setting */
1754         if (priv->features & FEATURE_HOST_NOTIFY)
1755                 priv->original_slvcmd = inb_p(SMBSLVCMD(priv));
1756
1757         /* Default timeout in interrupt mode: 200 ms */
1758         priv->adapter.timeout = HZ / 5;
1759
1760         if (dev->irq == IRQ_NOTCONNECTED)
1761                 priv->features &= ~FEATURE_IRQ;
1762
1763         if (priv->features & FEATURE_IRQ) {
1764                 u16 pcictl, pcists;
1765
1766                 /* Complain if an interrupt is already pending */
1767                 pci_read_config_word(priv->pci_dev, SMBPCISTS, &pcists);
1768                 if (pcists & SMBPCISTS_INTS)
1769                         dev_warn(&dev->dev, "An interrupt is pending!\n");
1770
1771                 /* Check if interrupts have been disabled */
1772                 pci_read_config_word(priv->pci_dev, SMBPCICTL, &pcictl);
1773                 if (pcictl & SMBPCICTL_INTDIS) {
1774                         dev_info(&dev->dev, "Interrupts are disabled\n");
1775                         priv->features &= ~FEATURE_IRQ;
1776                 }
1777         }
1778
1779         if (priv->features & FEATURE_IRQ) {
1780                 init_waitqueue_head(&priv->waitq);
1781
1782                 err = devm_request_irq(&dev->dev, dev->irq, i801_isr,
1783                                        IRQF_SHARED,
1784                                        dev_driver_string(&dev->dev), priv);
1785                 if (err) {
1786                         dev_err(&dev->dev, "Failed to allocate irq %d: %d\n",
1787                                 dev->irq, err);
1788                         priv->features &= ~FEATURE_IRQ;
1789                 }
1790         }
1791         dev_info(&dev->dev, "SMBus using %s\n",
1792                  priv->features & FEATURE_IRQ ? "PCI interrupt" : "polling");
1793
1794         i801_add_tco(priv);
1795
1796         snprintf(priv->adapter.name, sizeof(priv->adapter.name),
1797                 "SMBus I801 adapter at %04lx", priv->smba);
1798         err = i2c_add_adapter(&priv->adapter);
1799         if (err) {
1800                 i801_acpi_remove(priv);
1801                 return err;
1802         }
1803
1804         i801_enable_host_notify(&priv->adapter);
1805
1806         i801_probe_optional_slaves(priv);
1807         /* We ignore errors - multiplexing is optional */
1808         i801_add_mux(priv);
1809
1810         pci_set_drvdata(dev, priv);
1811
1812         pm_runtime_set_autosuspend_delay(&dev->dev, 1000);
1813         pm_runtime_use_autosuspend(&dev->dev);
1814         pm_runtime_put_autosuspend(&dev->dev);
1815         pm_runtime_allow(&dev->dev);
1816
1817         return 0;
1818 }
1819
1820 static void i801_remove(struct pci_dev *dev)
1821 {
1822         struct i801_priv *priv = pci_get_drvdata(dev);
1823
1824         pm_runtime_forbid(&dev->dev);
1825         pm_runtime_get_noresume(&dev->dev);
1826
1827         i801_disable_host_notify(priv);
1828         i801_del_mux(priv);
1829         i2c_del_adapter(&priv->adapter);
1830         i801_acpi_remove(priv);
1831         pci_write_config_byte(dev, SMBHSTCFG, priv->original_hstcfg);
1832
1833         platform_device_unregister(priv->tco_pdev);
1834
1835         /*
1836          * do not call pci_disable_device(dev) since it can cause hard hangs on
1837          * some systems during power-off (eg. Fujitsu-Siemens Lifebook E8010)
1838          */
1839 }
1840
1841 static void i801_shutdown(struct pci_dev *dev)
1842 {
1843         struct i801_priv *priv = pci_get_drvdata(dev);
1844
1845         /* Restore config registers to avoid hard hang on some systems */
1846         i801_disable_host_notify(priv);
1847         pci_write_config_byte(dev, SMBHSTCFG, priv->original_hstcfg);
1848 }
1849
1850 #ifdef CONFIG_PM_SLEEP
1851 static int i801_suspend(struct device *dev)
1852 {
1853         struct pci_dev *pci_dev = to_pci_dev(dev);
1854         struct i801_priv *priv = pci_get_drvdata(pci_dev);
1855
1856         pci_write_config_byte(pci_dev, SMBHSTCFG, priv->original_hstcfg);
1857         return 0;
1858 }
1859
1860 static int i801_resume(struct device *dev)
1861 {
1862         struct pci_dev *pci_dev = to_pci_dev(dev);
1863         struct i801_priv *priv = pci_get_drvdata(pci_dev);
1864
1865         i801_enable_host_notify(&priv->adapter);
1866
1867         return 0;
1868 }
1869 #endif
1870
1871 static SIMPLE_DEV_PM_OPS(i801_pm_ops, i801_suspend, i801_resume);
1872
1873 static struct pci_driver i801_driver = {
1874         .name           = "i801_smbus",
1875         .id_table       = i801_ids,
1876         .probe          = i801_probe,
1877         .remove         = i801_remove,
1878         .shutdown       = i801_shutdown,
1879         .driver         = {
1880                 .pm     = &i801_pm_ops,
1881         },
1882 };
1883
1884 static int __init i2c_i801_init(void)
1885 {
1886         if (dmi_name_in_vendors("FUJITSU"))
1887                 input_apanel_init();
1888         return pci_register_driver(&i801_driver);
1889 }
1890
1891 static void __exit i2c_i801_exit(void)
1892 {
1893         pci_unregister_driver(&i801_driver);
1894 }
1895
1896 MODULE_AUTHOR("Mark D. Studebaker <mdsxyz123@yahoo.com>, Jean Delvare <jdelvare@suse.de>");
1897 MODULE_DESCRIPTION("I801 SMBus driver");
1898 MODULE_LICENSE("GPL");
1899
1900 module_init(i2c_i801_init);
1901 module_exit(i2c_i801_exit);