drivers/i2c/busses/i2c-ali1563.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /**
   3  *      i2c-ali1563.c - i2c driver for the ALi 1563 Southbridge
   4  *
   5  *      Copyright (C) 2004 Patrick Mochel
   6  *                    2005 Rudolf Marek <r.marek@assembler.cz>
   7  *
   8  *      The 1563 southbridge is deceptively similar to the 1533, with a
   9  *      few notable exceptions. One of those happens to be the fact they
  10  *      upgraded the i2c core to be 2.0 compliant, and happens to be almost
  11  *      identical to the i2c controller found in the Intel 801 south
  12  *      bridges.
  13  *
  14  *      This driver is based on a mix of the 15x3, 1535, and i801 drivers,
  15  *      with a little help from the ALi 1563 spec.
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/delay.h>
  20 #include <linux/i2c.h>
  21 #include <linux/pci.h>
  22 #include <linux/acpi.h>
  23
  24 #define ALI1563_MAX_TIMEOUT     500
  25 #define ALI1563_SMBBA           0x80
  26 #define ALI1563_SMB_IOEN        1
  27 #define ALI1563_SMB_HOSTEN      2
  28 #define ALI1563_SMB_IOSIZE      16
  29
  30 #define SMB_HST_STS     (ali1563_smba + 0)
  31 #define SMB_HST_CNTL1   (ali1563_smba + 1)
  32 #define SMB_HST_CNTL2   (ali1563_smba + 2)
  33 #define SMB_HST_CMD     (ali1563_smba + 3)
  34 #define SMB_HST_ADD     (ali1563_smba + 4)
  35 #define SMB_HST_DAT0    (ali1563_smba + 5)
  36 #define SMB_HST_DAT1    (ali1563_smba + 6)
  37 #define SMB_BLK_DAT     (ali1563_smba + 7)
  38
  39 #define HST_STS_BUSY    0x01
  40 #define HST_STS_INTR    0x02
  41 #define HST_STS_DEVERR  0x04
  42 #define HST_STS_BUSERR  0x08
  43 #define HST_STS_FAIL    0x10
  44 #define HST_STS_DONE    0x80
  45 #define HST_STS_BAD     0x1c
  46
  47
  48 #define HST_CNTL1_TIMEOUT       0x80
  49 #define HST_CNTL1_LAST          0x40
  50
  51 #define HST_CNTL2_KILL          0x04
  52 #define HST_CNTL2_START         0x40
  53 #define HST_CNTL2_QUICK         0x00
  54 #define HST_CNTL2_BYTE          0x01
  55 #define HST_CNTL2_BYTE_DATA     0x02
  56 #define HST_CNTL2_WORD_DATA     0x03
  57 #define HST_CNTL2_BLOCK         0x05
  58
  59
  60 #define HST_CNTL2_SIZEMASK      0x38
  61
  62 static struct pci_driver ali1563_pci_driver;
  63 static unsigned short ali1563_smba;
  64
  65 static int ali1563_transaction(struct i2c_adapter *a, int size)
  66 {
  67         u32 data;
  68         int timeout;
  69         int status = -EIO;
  70
  71         dev_dbg(&a->dev, "Transaction (pre): STS=%02x, CNTL1=%02x, "
  72                 "CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
  73                 inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
  74                 inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
  75                 inb_p(SMB_HST_DAT1));
  76
  77         data = inb_p(SMB_HST_STS);
  78         if (data & HST_STS_BAD) {
  79                 dev_err(&a->dev, "ali1563: Trying to reset busy device\n");
  80                 outb_p(data | HST_STS_BAD, SMB_HST_STS);
  81                 data = inb_p(SMB_HST_STS);
  82                 if (data & HST_STS_BAD)
  83                         return -EBUSY;
  84         }
  85         outb_p(inb_p(SMB_HST_CNTL2) | HST_CNTL2_START, SMB_HST_CNTL2);
  86
  87         timeout = ALI1563_MAX_TIMEOUT;
  88         do {
  89                 msleep(1);
  90         } while (((data = inb_p(SMB_HST_STS)) & HST_STS_BUSY) && --timeout);
  91
  92         dev_dbg(&a->dev, "Transaction (post): STS=%02x, CNTL1=%02x, "
  93                 "CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
  94                 inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
  95                 inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
  96                 inb_p(SMB_HST_DAT1));
  97
  98         if (timeout && !(data & HST_STS_BAD))
  99                 return 0;
 100
 101         if (!timeout) {
 102                 dev_err(&a->dev, "Timeout - Trying to KILL transaction!\n");
 103                 /* Issue 'kill' to host controller */
 104                 outb_p(HST_CNTL2_KILL, SMB_HST_CNTL2);
 105                 data = inb_p(SMB_HST_STS);
 106                 status = -ETIMEDOUT;
 107         }
 108
 109         /* device error - no response, ignore the autodetection case */
 110         if (data & HST_STS_DEVERR) {
 111                 if (size != HST_CNTL2_QUICK)
 112                         dev_err(&a->dev, "Device error!\n");
 113                 status = -ENXIO;
 114         }
 115         /* bus collision */
 116         if (data & HST_STS_BUSERR) {
 117                 dev_err(&a->dev, "Bus collision!\n");
 118                 /* Issue timeout, hoping it helps */
 119                 outb_p(HST_CNTL1_TIMEOUT, SMB_HST_CNTL1);
 120         }
 121
 122         if (data & HST_STS_FAIL) {
 123                 dev_err(&a->dev, "Cleaning fail after KILL!\n");
 124                 outb_p(0x0, SMB_HST_CNTL2);
 125         }
 126
 127         return status;
 128 }
 129
 130 static int ali1563_block_start(struct i2c_adapter *a)
 131 {
 132         u32 data;
 133         int timeout;
 134         int status = -EIO;
 135
 136         dev_dbg(&a->dev, "Block (pre): STS=%02x, CNTL1=%02x, "
 137                 "CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
 138                 inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
 139                 inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
 140                 inb_p(SMB_HST_DAT1));
 141
 142         data = inb_p(SMB_HST_STS);
 143         if (data & HST_STS_BAD) {
 144                 dev_warn(&a->dev, "ali1563: Trying to reset busy device\n");
 145                 outb_p(data | HST_STS_BAD, SMB_HST_STS);
 146                 data = inb_p(SMB_HST_STS);
 147                 if (data & HST_STS_BAD)
 148                         return -EBUSY;
 149         }
 150
 151         /* Clear byte-ready bit */
 152         outb_p(data | HST_STS_DONE, SMB_HST_STS);
 153
 154         /* Start transaction and wait for byte-ready bit to be set */
 155         outb_p(inb_p(SMB_HST_CNTL2) | HST_CNTL2_START, SMB_HST_CNTL2);
 156
 157         timeout = ALI1563_MAX_TIMEOUT;
 158         do {
 159                 msleep(1);
 160         } while (!((data = inb_p(SMB_HST_STS)) & HST_STS_DONE) && --timeout);
 161
 162         dev_dbg(&a->dev, "Block (post): STS=%02x, CNTL1=%02x, "
 163                 "CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
 164                 inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
 165                 inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
 166                 inb_p(SMB_HST_DAT1));
 167
 168         if (timeout && !(data & HST_STS_BAD))
 169                 return 0;
 170
 171         if (timeout == 0)
 172                 status = -ETIMEDOUT;
 173
 174         if (data & HST_STS_DEVERR)
 175                 status = -ENXIO;
 176
 177         dev_err(&a->dev, "SMBus Error: %s%s%s%s%s\n",
 178                 timeout ? "" : "Timeout ",
 179                 data & HST_STS_FAIL ? "Transaction Failed " : "",
 180                 data & HST_STS_BUSERR ? "No response or Bus Collision " : "",
 181                 data & HST_STS_DEVERR ? "Device Error " : "",
 182                 !(data & HST_STS_DONE) ? "Transaction Never Finished " : "");
 183         return status;
 184 }
 185
 186 static int ali1563_block(struct i2c_adapter *a,
 187                          union i2c_smbus_data *data, u8 rw)
 188 {
 189         int i, len;
 190         int error = 0;
 191
 192         /* Do we need this? */
 193         outb_p(HST_CNTL1_LAST, SMB_HST_CNTL1);
 194
 195         if (rw == I2C_SMBUS_WRITE) {
 196                 len = data->block[0];
 197                 if (len < 1)
 198                         len = 1;
 199                 else if (len > 32)
 200                         len = 32;
 201                 outb_p(len, SMB_HST_DAT0);
 202                 outb_p(data->block[1], SMB_BLK_DAT);
 203         } else
 204                 len = 32;
 205
 206         outb_p(inb_p(SMB_HST_CNTL2) | HST_CNTL2_BLOCK, SMB_HST_CNTL2);
 207
 208         for (i = 0; i < len; i++) {
 209                 if (rw == I2C_SMBUS_WRITE) {
 210                         outb_p(data->block[i + 1], SMB_BLK_DAT);
 211                         error = ali1563_block_start(a);
 212                         if (error)
 213                                 break;
 214                 } else {
 215                         error = ali1563_block_start(a);
 216                         if (error)
 217                                 break;
 218                         if (i == 0) {
 219                                 len = inb_p(SMB_HST_DAT0);
 220                                 if (len < 1)
 221                                         len = 1;
 222                                 else if (len > 32)
 223                                         len = 32;
 224                         }
 225                         data->block[i+1] = inb_p(SMB_BLK_DAT);
 226                 }
 227         }
 228         /* Do we need this? */
 229         outb_p(HST_CNTL1_LAST, SMB_HST_CNTL1);
 230         return error;
 231 }
 232
 233 static s32 ali1563_access(struct i2c_adapter *a, u16 addr,
 234                           unsigned short flags, char rw, u8 cmd,
 235                           int size, union i2c_smbus_data *data)
 236 {
 237         int error = 0;
 238         int timeout;
 239         u32 reg;
 240
 241         for (timeout = ALI1563_MAX_TIMEOUT; timeout; timeout--) {
 242                 reg = inb_p(SMB_HST_STS);
 243                 if (!(reg & HST_STS_BUSY))
 244                         break;
 245         }
 246         if (!timeout)
 247                 dev_warn(&a->dev, "SMBus not idle. HST_STS = %02x\n", reg);
 248         outb_p(0xff, SMB_HST_STS);
 249
 250         /* Map the size to what the chip understands */
 251         switch (size) {
 252         case I2C_SMBUS_QUICK:
 253                 size = HST_CNTL2_QUICK;
 254                 break;
 255         case I2C_SMBUS_BYTE:
 256                 size = HST_CNTL2_BYTE;
 257                 break;
 258         case I2C_SMBUS_BYTE_DATA:
 259                 size = HST_CNTL2_BYTE_DATA;
 260                 break;
 261         case I2C_SMBUS_WORD_DATA:
 262                 size = HST_CNTL2_WORD_DATA;
 263                 break;
 264         case I2C_SMBUS_BLOCK_DATA:
 265                 size = HST_CNTL2_BLOCK;
 266                 break;
 267         default:
 268                 dev_warn(&a->dev, "Unsupported transaction %d\n", size);
 269                 error = -EOPNOTSUPP;
 270                 goto Done;
 271         }
 272
 273         outb_p(((addr & 0x7f) << 1) | (rw & 0x01), SMB_HST_ADD);
 274         outb_p((inb_p(SMB_HST_CNTL2) & ~HST_CNTL2_SIZEMASK) |
 275                (size << 3), SMB_HST_CNTL2);
 276
 277         /* Write the command register */
 278
 279         switch (size) {
 280         case HST_CNTL2_BYTE:
 281                 if (rw == I2C_SMBUS_WRITE)
 282                         /* Beware it uses DAT0 register and not CMD! */
 283                         outb_p(cmd, SMB_HST_DAT0);
 284                 break;
 285         case HST_CNTL2_BYTE_DATA:
 286                 outb_p(cmd, SMB_HST_CMD);
 287                 if (rw == I2C_SMBUS_WRITE)
 288                         outb_p(data->byte, SMB_HST_DAT0);
 289                 break;
 290         case HST_CNTL2_WORD_DATA:
 291                 outb_p(cmd, SMB_HST_CMD);
 292                 if (rw == I2C_SMBUS_WRITE) {
 293                         outb_p(data->word & 0xff, SMB_HST_DAT0);
 294                         outb_p((data->word & 0xff00) >> 8, SMB_HST_DAT1);
 295                 }
 296                 break;
 297         case HST_CNTL2_BLOCK:
 298                 outb_p(cmd, SMB_HST_CMD);
 299                 error = ali1563_block(a, data, rw);
 300                 goto Done;
 301         }
 302
 303         error = ali1563_transaction(a, size);
 304         if (error)
 305                 goto Done;
 306
 307         if ((rw == I2C_SMBUS_WRITE) || (size == HST_CNTL2_QUICK))
 308                 goto Done;
 309
 310         switch (size) {
 311         case HST_CNTL2_BYTE:    /* Result put in SMBHSTDAT0 */
 312                 data->byte = inb_p(SMB_HST_DAT0);
 313                 break;
 314         case HST_CNTL2_BYTE_DATA:
 315                 data->byte = inb_p(SMB_HST_DAT0);
 316                 break;
 317         case HST_CNTL2_WORD_DATA:
 318                 data->word = inb_p(SMB_HST_DAT0) + (inb_p(SMB_HST_DAT1) << 8);
 319                 break;
 320         }
 321 Done:
 322         return error;
 323 }
 324
 325 static u32 ali1563_func(struct i2c_adapter *a)
 326 {
 327         return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
 328             I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
 329             I2C_FUNC_SMBUS_BLOCK_DATA;
 330 }
 331
 332
 333 static int ali1563_setup(struct pci_dev *dev)
 334 {
 335         u16 ctrl;
 336
 337         pci_read_config_word(dev, ALI1563_SMBBA, &ctrl);
 338
 339         /* SMB I/O Base in high 12 bits and must be aligned with the
 340          * size of the I/O space. */
 341         ali1563_smba = ctrl & ~(ALI1563_SMB_IOSIZE - 1);
 342         if (!ali1563_smba) {
 343                 dev_warn(&dev->dev, "ali1563_smba Uninitialized\n");
 344                 goto Err;
 345         }
 346
 347         /* Check if device is enabled */
 348         if (!(ctrl & ALI1563_SMB_HOSTEN)) {
 349                 dev_warn(&dev->dev, "Host Controller not enabled\n");
 350                 goto Err;
 351         }
 352         if (!(ctrl & ALI1563_SMB_IOEN)) {
 353                 dev_warn(&dev->dev, "I/O space not enabled, trying manually\n");
 354                 pci_write_config_word(dev, ALI1563_SMBBA,
 355                                       ctrl | ALI1563_SMB_IOEN);
 356                 pci_read_config_word(dev, ALI1563_SMBBA, &ctrl);
 357                 if (!(ctrl & ALI1563_SMB_IOEN)) {
 358                         dev_err(&dev->dev,
 359                                 "I/O space still not enabled, giving up\n");
 360                         goto Err;
 361                 }
 362         }
 363
 364         if (acpi_check_region(ali1563_smba, ALI1563_SMB_IOSIZE,
 365                               ali1563_pci_driver.name))
 366                 goto Err;
 367
 368         if (!request_region(ali1563_smba, ALI1563_SMB_IOSIZE,
 369                             ali1563_pci_driver.name)) {
 370                 dev_err(&dev->dev, "Could not allocate I/O space at 0x%04x\n",
 371                         ali1563_smba);
 372                 goto Err;
 373         }
 374         dev_info(&dev->dev, "Found ALi1563 SMBus at 0x%04x\n", ali1563_smba);
 375
 376         return 0;
 377 Err:
 378         return -ENODEV;
 379 }
 380
 381 static void ali1563_shutdown(struct pci_dev *dev)
 382 {
 383         release_region(ali1563_smba, ALI1563_SMB_IOSIZE);
 384 }
 385
 386 static const struct i2c_algorithm ali1563_algorithm = {
 387         .smbus_xfer     = ali1563_access,
 388         .functionality  = ali1563_func,
 389 };
 390
 391 static struct i2c_adapter ali1563_adapter = {
 392         .owner  = THIS_MODULE,
 393         .class  = I2C_CLASS_HWMON | I2C_CLASS_SPD,
 394         .algo   = &ali1563_algorithm,
 395 };
 396
 397 static int ali1563_probe(struct pci_dev *dev,
 398                          const struct pci_device_id *id_table)
 399 {
 400         int error;
 401
 402         error = ali1563_setup(dev);
 403         if (error)
 404                 goto exit;
 405         ali1563_adapter.dev.parent = &dev->dev;
 406         snprintf(ali1563_adapter.name, sizeof(ali1563_adapter.name),
 407                  "SMBus ALi 1563 Adapter @ %04x", ali1563_smba);
 408         error = i2c_add_adapter(&ali1563_adapter);
 409         if (error)
 410                 goto exit_shutdown;
 411         return 0;
 412
 413 exit_shutdown:
 414         ali1563_shutdown(dev);
 415 exit:
 416         dev_warn(&dev->dev, "ALi1563 SMBus probe failed (%d)\n", error);
 417         return error;
 418 }
 419
 420 static void ali1563_remove(struct pci_dev *dev)
 421 {
 422         i2c_del_adapter(&ali1563_adapter);
 423         ali1563_shutdown(dev);
 424 }
 425
 426 static const struct pci_device_id ali1563_id_table[] = {
 427         { PCI_DEVICE(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1563) },
 428         {},
 429 };
 430
 431 MODULE_DEVICE_TABLE(pci, ali1563_id_table);
 432
 433 static struct pci_driver ali1563_pci_driver = {
 434         .name           = "ali1563_smbus",
 435         .id_table       = ali1563_id_table,
 436         .probe          = ali1563_probe,
 437         .remove         = ali1563_remove,
 438 };
 439
 440 module_pci_driver(ali1563_pci_driver);
 441
 442 MODULE_LICENSE("GPL");