drivers/i2c/busses/i2c-xgene-slimpro.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * X-Gene SLIMpro I2C Driver
   4  *
   5  * Copyright (c) 2014, Applied Micro Circuits Corporation
   6  * Author: Feng Kan <fkan@apm.com>
   7  * Author: Hieu Le <hnle@apm.com>
   8  *
   9  * This driver provides support for X-Gene SLIMpro I2C device access
  10  * using the APM X-Gene SLIMpro mailbox driver.
  11  */
  12 #include <acpi/pcc.h>
  13 #include <linux/acpi.h>
  14 #include <linux/dma-mapping.h>
  15 #include <linux/i2c.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/io.h>
  18 #include <linux/mailbox_client.h>
  19 #include <linux/module.h>
  20 #include <linux/of.h>
  21 #include <linux/platform_device.h>
  22
  23 #define MAILBOX_OP_TIMEOUT              1000    /* Operation time out in ms */
  24 #define MAILBOX_I2C_INDEX               0
  25 #define SLIMPRO_IIC_BUS                 1       /* Use I2C bus 1 only */
  26
  27 #define SMBUS_CMD_LEN                   1
  28 #define BYTE_DATA                       1
  29 #define WORD_DATA                       2
  30 #define BLOCK_DATA                      3
  31
  32 #define SLIMPRO_IIC_I2C_PROTOCOL        0
  33 #define SLIMPRO_IIC_SMB_PROTOCOL        1
  34
  35 #define SLIMPRO_IIC_READ                0
  36 #define SLIMPRO_IIC_WRITE               1
  37
  38 #define IIC_SMB_WITHOUT_DATA_LEN        0
  39 #define IIC_SMB_WITH_DATA_LEN           1
  40
  41 #define SLIMPRO_DEBUG_MSG               0
  42 #define SLIMPRO_MSG_TYPE_SHIFT          28
  43 #define SLIMPRO_DBG_SUBTYPE_I2C1READ    4
  44 #define SLIMPRO_DBGMSG_TYPE_SHIFT       24
  45 #define SLIMPRO_DBGMSG_TYPE_MASK        0x0F000000U
  46 #define SLIMPRO_IIC_DEV_SHIFT           23
  47 #define SLIMPRO_IIC_DEV_MASK            0x00800000U
  48 #define SLIMPRO_IIC_DEVID_SHIFT         13
  49 #define SLIMPRO_IIC_DEVID_MASK          0x007FE000U
  50 #define SLIMPRO_IIC_RW_SHIFT            12
  51 #define SLIMPRO_IIC_RW_MASK             0x00001000U
  52 #define SLIMPRO_IIC_PROTO_SHIFT         11
  53 #define SLIMPRO_IIC_PROTO_MASK          0x00000800U
  54 #define SLIMPRO_IIC_ADDRLEN_SHIFT       8
  55 #define SLIMPRO_IIC_ADDRLEN_MASK        0x00000700U
  56 #define SLIMPRO_IIC_DATALEN_SHIFT       0
  57 #define SLIMPRO_IIC_DATALEN_MASK        0x000000FFU
  58
  59 /*
  60  * SLIMpro I2C message encode
  61  *
  62  * dev          - Controller number (0-based)
  63  * chip         - I2C chip address
  64  * op           - SLIMPRO_IIC_READ or SLIMPRO_IIC_WRITE
  65  * proto        - SLIMPRO_IIC_SMB_PROTOCOL or SLIMPRO_IIC_I2C_PROTOCOL
  66  * addrlen      - Length of the address field
  67  * datalen      - Length of the data field
  68  */
  69 #define SLIMPRO_IIC_ENCODE_MSG(dev, chip, op, proto, addrlen, datalen) \
  70         ((SLIMPRO_DEBUG_MSG << SLIMPRO_MSG_TYPE_SHIFT) | \
  71         ((SLIMPRO_DBG_SUBTYPE_I2C1READ << SLIMPRO_DBGMSG_TYPE_SHIFT) & \
  72         SLIMPRO_DBGMSG_TYPE_MASK) | \
  73         ((dev << SLIMPRO_IIC_DEV_SHIFT) & SLIMPRO_IIC_DEV_MASK) | \
  74         ((chip << SLIMPRO_IIC_DEVID_SHIFT) & SLIMPRO_IIC_DEVID_MASK) | \
  75         ((op << SLIMPRO_IIC_RW_SHIFT) & SLIMPRO_IIC_RW_MASK) | \
  76         ((proto << SLIMPRO_IIC_PROTO_SHIFT) & SLIMPRO_IIC_PROTO_MASK) | \
  77         ((addrlen << SLIMPRO_IIC_ADDRLEN_SHIFT) & SLIMPRO_IIC_ADDRLEN_MASK) | \
  78         ((datalen << SLIMPRO_IIC_DATALEN_SHIFT) & SLIMPRO_IIC_DATALEN_MASK))
  79
  80 #define SLIMPRO_MSG_TYPE(v)             (((v) & 0xF0000000) >> 28)
  81
  82 /*
  83  * Encode for upper address for block data
  84  */
  85 #define SLIMPRO_IIC_ENCODE_FLAG_BUFADDR                 0x80000000
  86 #define SLIMPRO_IIC_ENCODE_FLAG_WITH_DATA_LEN(a)        ((u32) (((a) << 30) \
  87                                                                 & 0x40000000))
  88 #define SLIMPRO_IIC_ENCODE_UPPER_BUFADDR(a)             ((u32) (((a) >> 12) \
  89                                                                 & 0x3FF00000))
  90 #define SLIMPRO_IIC_ENCODE_ADDR(a)                      ((a) & 0x000FFFFF)
  91
  92 #define SLIMPRO_IIC_MSG_DWORD_COUNT                     3
  93
  94 struct slimpro_i2c_dev {
  95         struct i2c_adapter adapter;
  96         struct device *dev;
  97         struct mbox_chan *mbox_chan;
  98         struct pcc_mbox_chan *pcc_chan;
  99         struct mbox_client mbox_client;
 100         int mbox_idx;
 101         struct completion rd_complete;
 102         u8 dma_buffer[I2C_SMBUS_BLOCK_MAX + 1]; /* dma_buffer[0] is used for length */
 103         u32 *resp_msg;
 104         phys_addr_t comm_base_addr;
 105         void *pcc_comm_addr;
 106 };
 107
 108 #define to_slimpro_i2c_dev(cl)  \
 109                 container_of(cl, struct slimpro_i2c_dev, mbox_client)
 110
 111 enum slimpro_i2c_version {
 112         XGENE_SLIMPRO_I2C_V1 = 0,
 113         XGENE_SLIMPRO_I2C_V2 = 1,
 114 };
 115
 116 /*
 117  * This function tests and clears a bitmask then returns its old value
 118  */
 119 static u16 xgene_word_tst_and_clr(u16 *addr, u16 mask)
 120 {
 121         u16 ret, val;
 122
 123         val = le16_to_cpu(READ_ONCE(*addr));
 124         ret = val & mask;
 125         val &= ~mask;
 126         WRITE_ONCE(*addr, cpu_to_le16(val));
 127
 128         return ret;
 129 }
 130
 131 static void slimpro_i2c_rx_cb(struct mbox_client *cl, void *mssg)
 132 {
 133         struct slimpro_i2c_dev *ctx = to_slimpro_i2c_dev(cl);
 134
 135         /*
 136          * Response message format:
 137          * mssg[0] is the return code of the operation
 138          * mssg[1] is the first data word
 139          * mssg[2] is NOT used
 140          */
 141         if (ctx->resp_msg)
 142                 *ctx->resp_msg = ((u32 *)mssg)[1];
 143
 144         if (ctx->mbox_client.tx_block)
 145                 complete(&ctx->rd_complete);
 146 }
 147
 148 static void slimpro_i2c_pcc_rx_cb(struct mbox_client *cl, void *msg)
 149 {
 150         struct slimpro_i2c_dev *ctx = to_slimpro_i2c_dev(cl);
 151         struct acpi_pcct_shared_memory *generic_comm_base = ctx->pcc_comm_addr;
 152
 153         /* Check if platform sends interrupt */
 154         if (!xgene_word_tst_and_clr(&generic_comm_base->status,
 155                                     PCC_STATUS_SCI_DOORBELL))
 156                 return;
 157
 158         if (xgene_word_tst_and_clr(&generic_comm_base->status,
 159                                    PCC_STATUS_CMD_COMPLETE)) {
 160                 msg = generic_comm_base + 1;
 161
 162                 /* Response message msg[1] contains the return value. */
 163                 if (ctx->resp_msg)
 164                         *ctx->resp_msg = ((u32 *)msg)[1];
 165
 166                 complete(&ctx->rd_complete);
 167         }
 168 }
 169
 170 static void slimpro_i2c_pcc_tx_prepare(struct slimpro_i2c_dev *ctx, u32 *msg)
 171 {
 172         struct acpi_pcct_shared_memory *generic_comm_base = ctx->pcc_comm_addr;
 173         u32 *ptr = (void *)(generic_comm_base + 1);
 174         u16 status;
 175         int i;
 176
 177         WRITE_ONCE(generic_comm_base->signature,
 178                    cpu_to_le32(PCC_SIGNATURE | ctx->mbox_idx));
 179
 180         WRITE_ONCE(generic_comm_base->command,
 181                    cpu_to_le16(SLIMPRO_MSG_TYPE(msg[0]) | PCC_CMD_GENERATE_DB_INTR));
 182
 183         status = le16_to_cpu(READ_ONCE(generic_comm_base->status));
 184         status &= ~PCC_STATUS_CMD_COMPLETE;
 185         WRITE_ONCE(generic_comm_base->status, cpu_to_le16(status));
 186
 187         /* Copy the message to the PCC comm space */
 188         for (i = 0; i < SLIMPRO_IIC_MSG_DWORD_COUNT; i++)
 189                 WRITE_ONCE(ptr[i], cpu_to_le32(msg[i]));
 190 }
 191
 192 static int start_i2c_msg_xfer(struct slimpro_i2c_dev *ctx)
 193 {
 194         if (ctx->mbox_client.tx_block || !acpi_disabled) {
 195                 if (!wait_for_completion_timeout(&ctx->rd_complete,
 196                                                  msecs_to_jiffies(MAILBOX_OP_TIMEOUT)))
 197                         return -ETIMEDOUT;
 198         }
 199
 200         /* Check of invalid data or no device */
 201         if (*ctx->resp_msg == 0xffffffff)
 202                 return -ENODEV;
 203
 204         return 0;
 205 }
 206
 207 static int slimpro_i2c_send_msg(struct slimpro_i2c_dev *ctx,
 208                                 u32 *msg,
 209                                 u32 *data)
 210 {
 211         int rc;
 212
 213         ctx->resp_msg = data;
 214
 215         if (!acpi_disabled) {
 216                 reinit_completion(&ctx->rd_complete);
 217                 slimpro_i2c_pcc_tx_prepare(ctx, msg);
 218         }
 219
 220         rc = mbox_send_message(ctx->mbox_chan, msg);
 221         if (rc < 0)
 222                 goto err;
 223
 224         rc = start_i2c_msg_xfer(ctx);
 225
 226 err:
 227         if (!acpi_disabled)
 228                 mbox_chan_txdone(ctx->mbox_chan, 0);
 229
 230         ctx->resp_msg = NULL;
 231
 232         return rc;
 233 }
 234
 235 static int slimpro_i2c_rd(struct slimpro_i2c_dev *ctx, u32 chip,
 236                           u32 addr, u32 addrlen, u32 protocol,
 237                           u32 readlen, u32 *data)
 238 {
 239         u32 msg[3];
 240
 241         msg[0] = SLIMPRO_IIC_ENCODE_MSG(SLIMPRO_IIC_BUS, chip,
 242                                         SLIMPRO_IIC_READ, protocol, addrlen, readlen);
 243         msg[1] = SLIMPRO_IIC_ENCODE_ADDR(addr);
 244         msg[2] = 0;
 245
 246         return slimpro_i2c_send_msg(ctx, msg, data);
 247 }
 248
 249 static int slimpro_i2c_wr(struct slimpro_i2c_dev *ctx, u32 chip,
 250                           u32 addr, u32 addrlen, u32 protocol, u32 writelen,
 251                           u32 data)
 252 {
 253         u32 msg[3];
 254
 255         msg[0] = SLIMPRO_IIC_ENCODE_MSG(SLIMPRO_IIC_BUS, chip,
 256                                         SLIMPRO_IIC_WRITE, protocol, addrlen, writelen);
 257         msg[1] = SLIMPRO_IIC_ENCODE_ADDR(addr);
 258         msg[2] = data;
 259
 260         return slimpro_i2c_send_msg(ctx, msg, msg);
 261 }
 262
 263 static int slimpro_i2c_blkrd(struct slimpro_i2c_dev *ctx, u32 chip, u32 addr,
 264                              u32 addrlen, u32 protocol, u32 readlen,
 265                              u32 with_data_len, void *data)
 266 {
 267         dma_addr_t paddr;
 268         u32 msg[3];
 269         int rc;
 270
 271         paddr = dma_map_single(ctx->dev, ctx->dma_buffer, readlen, DMA_FROM_DEVICE);
 272         if (dma_mapping_error(ctx->dev, paddr)) {
 273                 dev_err(&ctx->adapter.dev, "Error in mapping dma buffer %p\n",
 274                         ctx->dma_buffer);
 275                 return -ENOMEM;
 276         }
 277
 278         msg[0] = SLIMPRO_IIC_ENCODE_MSG(SLIMPRO_IIC_BUS, chip, SLIMPRO_IIC_READ,
 279                                         protocol, addrlen, readlen);
 280         msg[1] = SLIMPRO_IIC_ENCODE_FLAG_BUFADDR |
 281                  SLIMPRO_IIC_ENCODE_FLAG_WITH_DATA_LEN(with_data_len) |
 282                  SLIMPRO_IIC_ENCODE_UPPER_BUFADDR(paddr) |
 283                  SLIMPRO_IIC_ENCODE_ADDR(addr);
 284         msg[2] = (u32)paddr;
 285
 286         rc = slimpro_i2c_send_msg(ctx, msg, msg);
 287
 288         /* Copy to destination */
 289         memcpy(data, ctx->dma_buffer, readlen);
 290
 291         dma_unmap_single(ctx->dev, paddr, readlen, DMA_FROM_DEVICE);
 292         return rc;
 293 }
 294
 295 static int slimpro_i2c_blkwr(struct slimpro_i2c_dev *ctx, u32 chip,
 296                              u32 addr, u32 addrlen, u32 protocol, u32 writelen,
 297                              void *data)
 298 {
 299         dma_addr_t paddr;
 300         u32 msg[3];
 301         int rc;
 302
 303         if (writelen > I2C_SMBUS_BLOCK_MAX)
 304                 return -EINVAL;
 305
 306         memcpy(ctx->dma_buffer, data, writelen);
 307         paddr = dma_map_single(ctx->dev, ctx->dma_buffer, writelen,
 308                                DMA_TO_DEVICE);
 309         if (dma_mapping_error(ctx->dev, paddr)) {
 310                 dev_err(&ctx->adapter.dev, "Error in mapping dma buffer %p\n",
 311                         ctx->dma_buffer);
 312                 return -ENOMEM;
 313         }
 314
 315         msg[0] = SLIMPRO_IIC_ENCODE_MSG(SLIMPRO_IIC_BUS, chip, SLIMPRO_IIC_WRITE,
 316                                         protocol, addrlen, writelen);
 317         msg[1] = SLIMPRO_IIC_ENCODE_FLAG_BUFADDR |
 318                  SLIMPRO_IIC_ENCODE_UPPER_BUFADDR(paddr) |
 319                  SLIMPRO_IIC_ENCODE_ADDR(addr);
 320         msg[2] = (u32)paddr;
 321
 322         if (ctx->mbox_client.tx_block)
 323                 reinit_completion(&ctx->rd_complete);
 324
 325         rc = slimpro_i2c_send_msg(ctx, msg, msg);
 326
 327         dma_unmap_single(ctx->dev, paddr, writelen, DMA_TO_DEVICE);
 328         return rc;
 329 }
 330
 331 static int xgene_slimpro_i2c_xfer(struct i2c_adapter *adap, u16 addr,
 332                                   unsigned short flags, char read_write,
 333                                   u8 command, int size,
 334                                   union i2c_smbus_data *data)
 335 {
 336         struct slimpro_i2c_dev *ctx = i2c_get_adapdata(adap);
 337         int ret = -EOPNOTSUPP;
 338         u32 val;
 339
 340         switch (size) {
 341         case I2C_SMBUS_BYTE:
 342                 if (read_write == I2C_SMBUS_READ) {
 343                         ret = slimpro_i2c_rd(ctx, addr, 0, 0,
 344                                              SLIMPRO_IIC_SMB_PROTOCOL,
 345                                              BYTE_DATA, &val);
 346                         data->byte = val;
 347                 } else {
 348                         ret = slimpro_i2c_wr(ctx, addr, command, SMBUS_CMD_LEN,
 349                                              SLIMPRO_IIC_SMB_PROTOCOL,
 350                                              0, 0);
 351                 }
 352                 break;
 353         case I2C_SMBUS_BYTE_DATA:
 354                 if (read_write == I2C_SMBUS_READ) {
 355                         ret = slimpro_i2c_rd(ctx, addr, command, SMBUS_CMD_LEN,
 356                                              SLIMPRO_IIC_SMB_PROTOCOL,
 357                                              BYTE_DATA, &val);
 358                         data->byte = val;
 359                 } else {
 360                         val = data->byte;
 361                         ret = slimpro_i2c_wr(ctx, addr, command, SMBUS_CMD_LEN,
 362                                              SLIMPRO_IIC_SMB_PROTOCOL,
 363                                              BYTE_DATA, val);
 364                 }
 365                 break;
 366         case I2C_SMBUS_WORD_DATA:
 367                 if (read_write == I2C_SMBUS_READ) {
 368                         ret = slimpro_i2c_rd(ctx, addr, command, SMBUS_CMD_LEN,
 369                                              SLIMPRO_IIC_SMB_PROTOCOL,
 370                                              WORD_DATA, &val);
 371                         data->word = val;
 372                 } else {
 373                         val = data->word;
 374                         ret = slimpro_i2c_wr(ctx, addr, command, SMBUS_CMD_LEN,
 375                                              SLIMPRO_IIC_SMB_PROTOCOL,
 376                                              WORD_DATA, val);
 377                 }
 378                 break;
 379         case I2C_SMBUS_BLOCK_DATA:
 380                 if (read_write == I2C_SMBUS_READ) {
 381                         ret = slimpro_i2c_blkrd(ctx, addr, command,
 382                                                 SMBUS_CMD_LEN,
 383                                                 SLIMPRO_IIC_SMB_PROTOCOL,
 384                                                 I2C_SMBUS_BLOCK_MAX + 1,
 385                                                 IIC_SMB_WITH_DATA_LEN,
 386                                                 &data->block[0]);
 387
 388                 } else {
 389                         ret = slimpro_i2c_blkwr(ctx, addr, command,
 390                                                 SMBUS_CMD_LEN,
 391                                                 SLIMPRO_IIC_SMB_PROTOCOL,
 392                                                 data->block[0] + 1,
 393                                                 &data->block[0]);
 394                 }
 395                 break;
 396         case I2C_SMBUS_I2C_BLOCK_DATA:
 397                 if (read_write == I2C_SMBUS_READ) {
 398                         ret = slimpro_i2c_blkrd(ctx, addr,
 399                                                 command,
 400                                                 SMBUS_CMD_LEN,
 401                                                 SLIMPRO_IIC_I2C_PROTOCOL,
 402                                                 I2C_SMBUS_BLOCK_MAX,
 403                                                 IIC_SMB_WITHOUT_DATA_LEN,
 404                                                 &data->block[1]);
 405                 } else {
 406                         ret = slimpro_i2c_blkwr(ctx, addr, command,
 407                                                 SMBUS_CMD_LEN,
 408                                                 SLIMPRO_IIC_I2C_PROTOCOL,
 409                                                 data->block[0],
 410                                                 &data->block[1]);
 411                 }
 412                 break;
 413         default:
 414                 break;
 415         }
 416         return ret;
 417 }
 418
 419 /*
 420 * Return list of supported functionality.
 421 */
 422 static u32 xgene_slimpro_i2c_func(struct i2c_adapter *adapter)
 423 {
 424         return I2C_FUNC_SMBUS_BYTE |
 425                 I2C_FUNC_SMBUS_BYTE_DATA |
 426                 I2C_FUNC_SMBUS_WORD_DATA |
 427                 I2C_FUNC_SMBUS_BLOCK_DATA |
 428                 I2C_FUNC_SMBUS_I2C_BLOCK;
 429 }
 430
 431 static const struct i2c_algorithm xgene_slimpro_i2c_algorithm = {
 432         .smbus_xfer = xgene_slimpro_i2c_xfer,
 433         .functionality = xgene_slimpro_i2c_func,
 434 };
 435
 436 static int xgene_slimpro_i2c_probe(struct platform_device *pdev)
 437 {
 438         struct slimpro_i2c_dev *ctx;
 439         struct i2c_adapter *adapter;
 440         struct mbox_client *cl;
 441         int rc;
 442
 443         ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
 444         if (!ctx)
 445                 return -ENOMEM;
 446
 447         ctx->dev = &pdev->dev;
 448         platform_set_drvdata(pdev, ctx);
 449         cl = &ctx->mbox_client;
 450
 451         /* Request mailbox channel */
 452         cl->dev = &pdev->dev;
 453         init_completion(&ctx->rd_complete);
 454         cl->tx_tout = MAILBOX_OP_TIMEOUT;
 455         cl->knows_txdone = false;
 456         if (acpi_disabled) {
 457                 cl->tx_block = true;
 458                 cl->rx_callback = slimpro_i2c_rx_cb;
 459                 ctx->mbox_chan = mbox_request_channel(cl, MAILBOX_I2C_INDEX);
 460                 if (IS_ERR(ctx->mbox_chan)) {
 461                         dev_err(&pdev->dev, "i2c mailbox channel request failed\n");
 462                         return PTR_ERR(ctx->mbox_chan);
 463                 }
 464         } else {
 465                 struct pcc_mbox_chan *pcc_chan;
 466                 const struct acpi_device_id *acpi_id;
 467                 int version = XGENE_SLIMPRO_I2C_V1;
 468
 469                 acpi_id = acpi_match_device(pdev->dev.driver->acpi_match_table,
 470                                             &pdev->dev);
 471                 if (!acpi_id)
 472                         return -EINVAL;
 473
 474                 version = (int)acpi_id->driver_data;
 475
 476                 if (device_property_read_u32(&pdev->dev, "pcc-channel",
 477                                              &ctx->mbox_idx))
 478                         ctx->mbox_idx = MAILBOX_I2C_INDEX;
 479
 480                 cl->tx_block = false;
 481                 cl->rx_callback = slimpro_i2c_pcc_rx_cb;
 482                 pcc_chan = pcc_mbox_request_channel(cl, ctx->mbox_idx);
 483                 if (IS_ERR(pcc_chan)) {
 484                         dev_err(&pdev->dev, "PCC mailbox channel request failed\n");
 485                         return PTR_ERR(pcc_chan);
 486                 }
 487
 488                 ctx->pcc_chan = pcc_chan;
 489                 ctx->mbox_chan = pcc_chan->mchan;
 490
 491                 if (!ctx->mbox_chan->mbox->txdone_irq) {
 492                         dev_err(&pdev->dev, "PCC IRQ not supported\n");
 493                         rc = -ENOENT;
 494                         goto mbox_err;
 495                 }
 496
 497                 /*
 498                  * This is the shared communication region
 499                  * for the OS and Platform to communicate over.
 500                  */
 501                 ctx->comm_base_addr = pcc_chan->shmem_base_addr;
 502                 if (ctx->comm_base_addr) {
 503                         if (version == XGENE_SLIMPRO_I2C_V2)
 504                                 ctx->pcc_comm_addr = memremap(
 505                                                         ctx->comm_base_addr,
 506                                                         pcc_chan->shmem_size,
 507                                                         MEMREMAP_WT);
 508                         else
 509                                 ctx->pcc_comm_addr = memremap(
 510                                                         ctx->comm_base_addr,
 511                                                         pcc_chan->shmem_size,
 512                                                         MEMREMAP_WB);
 513                 } else {
 514                         dev_err(&pdev->dev, "Failed to get PCC comm region\n");
 515                         rc = -ENOENT;
 516                         goto mbox_err;
 517                 }
 518
 519                 if (!ctx->pcc_comm_addr) {
 520                         dev_err(&pdev->dev,
 521                                 "Failed to ioremap PCC comm region\n");
 522                         rc = -ENOMEM;
 523                         goto mbox_err;
 524                 }
 525         }
 526         rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
 527         if (rc)
 528                 dev_warn(&pdev->dev, "Unable to set dma mask\n");
 529
 530         /* Setup I2C adapter */
 531         adapter = &ctx->adapter;
 532         snprintf(adapter->name, sizeof(adapter->name), "MAILBOX I2C");
 533         adapter->algo = &xgene_slimpro_i2c_algorithm;
 534         adapter->class = I2C_CLASS_HWMON;
 535         adapter->dev.parent = &pdev->dev;
 536         adapter->dev.of_node = pdev->dev.of_node;
 537         ACPI_COMPANION_SET(&adapter->dev, ACPI_COMPANION(&pdev->dev));
 538         i2c_set_adapdata(adapter, ctx);
 539         rc = i2c_add_adapter(adapter);
 540         if (rc)
 541                 goto mbox_err;
 542
 543         dev_info(&pdev->dev, "Mailbox I2C Adapter registered\n");
 544         return 0;
 545
 546 mbox_err:
 547         if (acpi_disabled)
 548                 mbox_free_channel(ctx->mbox_chan);
 549         else
 550                 pcc_mbox_free_channel(ctx->pcc_chan);
 551
 552         return rc;
 553 }
 554
 555 static void xgene_slimpro_i2c_remove(struct platform_device *pdev)
 556 {
 557         struct slimpro_i2c_dev *ctx = platform_get_drvdata(pdev);
 558
 559         i2c_del_adapter(&ctx->adapter);
 560
 561         if (acpi_disabled)
 562                 mbox_free_channel(ctx->mbox_chan);
 563         else
 564                 pcc_mbox_free_channel(ctx->pcc_chan);
 565 }
 566
 567 static const struct of_device_id xgene_slimpro_i2c_dt_ids[] = {
 568         {.compatible = "apm,xgene-slimpro-i2c" },
 569         {},
 570 };
 571 MODULE_DEVICE_TABLE(of, xgene_slimpro_i2c_dt_ids);
 572
 573 #ifdef CONFIG_ACPI
 574 static const struct acpi_device_id xgene_slimpro_i2c_acpi_ids[] = {
 575         {"APMC0D40", XGENE_SLIMPRO_I2C_V1},
 576         {"APMC0D8B", XGENE_SLIMPRO_I2C_V2},
 577         {}
 578 };
 579 MODULE_DEVICE_TABLE(acpi, xgene_slimpro_i2c_acpi_ids);
 580 #endif
 581
 582 static struct platform_driver xgene_slimpro_i2c_driver = {
 583         .probe  = xgene_slimpro_i2c_probe,
 584         .remove = xgene_slimpro_i2c_remove,
 585         .driver = {
 586                 .name   = "xgene-slimpro-i2c",
 587                 .of_match_table = of_match_ptr(xgene_slimpro_i2c_dt_ids),
 588                 .acpi_match_table = ACPI_PTR(xgene_slimpro_i2c_acpi_ids)
 589         },
 590 };
 591
 592 module_platform_driver(xgene_slimpro_i2c_driver);
 593
 594 MODULE_DESCRIPTION("APM X-Gene SLIMpro I2C driver");
 595 MODULE_AUTHOR("Feng Kan <fkan@apm.com>");
 596 MODULE_AUTHOR("Hieu Le <hnle@apm.com>");
 597 MODULE_LICENSE("GPL");