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

   1 /*
   2  * X-Gene SLIMpro I2C Driver
   3  *
   4  * Copyright (c) 2014, Applied Micro Circuits Corporation
   5  * Author: Feng Kan <fkan@apm.com>
   6  * Author: Hieu Le <hnle@apm.com>
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  20  *
  21  * This driver provides support for X-Gene SLIMpro I2C device access
  22  * using the APM X-Gene SLIMpro mailbox driver.
  23  *
  24  */
  25 #include <acpi/pcc.h>
  26 #include <linux/acpi.h>
  27 #include <linux/dma-mapping.h>
  28 #include <linux/i2c.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/io.h>
  31 #include <linux/mailbox_client.h>
  32 #include <linux/module.h>
  33 #include <linux/of.h>
  34 #include <linux/platform_device.h>
  35 #include <linux/version.h>
  36
  37 #define MAILBOX_OP_TIMEOUT              1000    /* Operation time out in ms */
  38 #define MAILBOX_I2C_INDEX               0
  39 #define SLIMPRO_IIC_BUS                 1       /* Use I2C bus 1 only */
  40
  41 #define SMBUS_CMD_LEN                   1
  42 #define BYTE_DATA                       1
  43 #define WORD_DATA                       2
  44 #define BLOCK_DATA                      3
  45
  46 #define SLIMPRO_IIC_I2C_PROTOCOL        0
  47 #define SLIMPRO_IIC_SMB_PROTOCOL        1
  48
  49 #define SLIMPRO_IIC_READ                0
  50 #define SLIMPRO_IIC_WRITE               1
  51
  52 #define IIC_SMB_WITHOUT_DATA_LEN        0
  53 #define IIC_SMB_WITH_DATA_LEN           1
  54
  55 #define SLIMPRO_DEBUG_MSG               0
  56 #define SLIMPRO_MSG_TYPE_SHIFT          28
  57 #define SLIMPRO_DBG_SUBTYPE_I2C1READ    4
  58 #define SLIMPRO_DBGMSG_TYPE_SHIFT       24
  59 #define SLIMPRO_DBGMSG_TYPE_MASK        0x0F000000U
  60 #define SLIMPRO_IIC_DEV_SHIFT           23
  61 #define SLIMPRO_IIC_DEV_MASK            0x00800000U
  62 #define SLIMPRO_IIC_DEVID_SHIFT         13
  63 #define SLIMPRO_IIC_DEVID_MASK          0x007FE000U
  64 #define SLIMPRO_IIC_RW_SHIFT            12
  65 #define SLIMPRO_IIC_RW_MASK             0x00001000U
  66 #define SLIMPRO_IIC_PROTO_SHIFT         11
  67 #define SLIMPRO_IIC_PROTO_MASK          0x00000800U
  68 #define SLIMPRO_IIC_ADDRLEN_SHIFT       8
  69 #define SLIMPRO_IIC_ADDRLEN_MASK        0x00000700U
  70 #define SLIMPRO_IIC_DATALEN_SHIFT       0
  71 #define SLIMPRO_IIC_DATALEN_MASK        0x000000FFU
  72
  73 /*
  74  * SLIMpro I2C message encode
  75  *
  76  * dev          - Controller number (0-based)
  77  * chip         - I2C chip address
  78  * op           - SLIMPRO_IIC_READ or SLIMPRO_IIC_WRITE
  79  * proto        - SLIMPRO_IIC_SMB_PROTOCOL or SLIMPRO_IIC_I2C_PROTOCOL
  80  * addrlen      - Length of the address field
  81  * datalen      - Length of the data field
  82  */
  83 #define SLIMPRO_IIC_ENCODE_MSG(dev, chip, op, proto, addrlen, datalen) \
  84         ((SLIMPRO_DEBUG_MSG << SLIMPRO_MSG_TYPE_SHIFT) | \
  85         ((SLIMPRO_DBG_SUBTYPE_I2C1READ << SLIMPRO_DBGMSG_TYPE_SHIFT) & \
  86         SLIMPRO_DBGMSG_TYPE_MASK) | \
  87         ((dev << SLIMPRO_IIC_DEV_SHIFT) & SLIMPRO_IIC_DEV_MASK) | \
  88         ((chip << SLIMPRO_IIC_DEVID_SHIFT) & SLIMPRO_IIC_DEVID_MASK) | \
  89         ((op << SLIMPRO_IIC_RW_SHIFT) & SLIMPRO_IIC_RW_MASK) | \
  90         ((proto << SLIMPRO_IIC_PROTO_SHIFT) & SLIMPRO_IIC_PROTO_MASK) | \
  91         ((addrlen << SLIMPRO_IIC_ADDRLEN_SHIFT) & SLIMPRO_IIC_ADDRLEN_MASK) | \
  92         ((datalen << SLIMPRO_IIC_DATALEN_SHIFT) & SLIMPRO_IIC_DATALEN_MASK))
  93
  94 #define SLIMPRO_MSG_TYPE(v)             (((v) & 0xF0000000) >> 28)
  95
  96 /*
  97  * Encode for upper address for block data
  98  */
  99 #define SLIMPRO_IIC_ENCODE_FLAG_BUFADDR                 0x80000000
 100 #define SLIMPRO_IIC_ENCODE_FLAG_WITH_DATA_LEN(a)        ((u32) (((a) << 30) \
 101                                                                 & 0x40000000))
 102 #define SLIMPRO_IIC_ENCODE_UPPER_BUFADDR(a)             ((u32) (((a) >> 12) \
 103                                                                 & 0x3FF00000))
 104 #define SLIMPRO_IIC_ENCODE_ADDR(a)                      ((a) & 0x000FFFFF)
 105
 106 #define SLIMPRO_IIC_MSG_DWORD_COUNT                     3
 107
 108 /* PCC related defines */
 109 #define PCC_SIGNATURE                   0x50424300
 110 #define PCC_STS_CMD_COMPLETE            BIT(0)
 111 #define PCC_STS_SCI_DOORBELL            BIT(1)
 112 #define PCC_STS_ERR                     BIT(2)
 113 #define PCC_STS_PLAT_NOTIFY             BIT(3)
 114 #define PCC_CMD_GENERATE_DB_INT         BIT(15)
 115
 116 struct slimpro_i2c_dev {
 117         struct i2c_adapter adapter;
 118         struct device *dev;
 119         struct mbox_chan *mbox_chan;
 120         struct mbox_client mbox_client;
 121         int mbox_idx;
 122         struct completion rd_complete;
 123         u8 dma_buffer[I2C_SMBUS_BLOCK_MAX + 1]; /* dma_buffer[0] is used for length */
 124         u32 *resp_msg;
 125         phys_addr_t comm_base_addr;
 126         void *pcc_comm_addr;
 127 };
 128
 129 #define to_slimpro_i2c_dev(cl)  \
 130                 container_of(cl, struct slimpro_i2c_dev, mbox_client)
 131
 132 enum slimpro_i2c_version {
 133         XGENE_SLIMPRO_I2C_V1 = 0,
 134         XGENE_SLIMPRO_I2C_V2 = 1,
 135 };
 136
 137 /*
 138  * This function tests and clears a bitmask then returns its old value
 139  */
 140 static u16 xgene_word_tst_and_clr(u16 *addr, u16 mask)
 141 {
 142         u16 ret, val;
 143
 144         val = le16_to_cpu(READ_ONCE(*addr));
 145         ret = val & mask;
 146         val &= ~mask;
 147         WRITE_ONCE(*addr, cpu_to_le16(val));
 148
 149         return ret;
 150 }
 151
 152 static void slimpro_i2c_rx_cb(struct mbox_client *cl, void *mssg)
 153 {
 154         struct slimpro_i2c_dev *ctx = to_slimpro_i2c_dev(cl);
 155
 156         /*
 157          * Response message format:
 158          * mssg[0] is the return code of the operation
 159          * mssg[1] is the first data word
 160          * mssg[2] is NOT used
 161          */
 162         if (ctx->resp_msg)
 163                 *ctx->resp_msg = ((u32 *)mssg)[1];
 164
 165         if (ctx->mbox_client.tx_block)
 166                 complete(&ctx->rd_complete);
 167 }
 168
 169 static void slimpro_i2c_pcc_rx_cb(struct mbox_client *cl, void *msg)
 170 {
 171         struct slimpro_i2c_dev *ctx = to_slimpro_i2c_dev(cl);
 172         struct acpi_pcct_shared_memory *generic_comm_base = ctx->pcc_comm_addr;
 173
 174         /* Check if platform sends interrupt */
 175         if (!xgene_word_tst_and_clr(&generic_comm_base->status,
 176                                     PCC_STS_SCI_DOORBELL))
 177                 return;
 178
 179         if (xgene_word_tst_and_clr(&generic_comm_base->status,
 180                                    PCC_STS_CMD_COMPLETE)) {
 181                 msg = generic_comm_base + 1;
 182
 183                 /* Response message msg[1] contains the return value. */
 184                 if (ctx->resp_msg)
 185                         *ctx->resp_msg = ((u32 *)msg)[1];
 186
 187                 complete(&ctx->rd_complete);
 188         }
 189 }
 190
 191 static void slimpro_i2c_pcc_tx_prepare(struct slimpro_i2c_dev *ctx, u32 *msg)
 192 {
 193         struct acpi_pcct_shared_memory *generic_comm_base = ctx->pcc_comm_addr;
 194         u32 *ptr = (void *)(generic_comm_base + 1);
 195         u16 status;
 196         int i;
 197
 198         WRITE_ONCE(generic_comm_base->signature,
 199                    cpu_to_le32(PCC_SIGNATURE | ctx->mbox_idx));
 200
 201         WRITE_ONCE(generic_comm_base->command,
 202                    cpu_to_le16(SLIMPRO_MSG_TYPE(msg[0]) | PCC_CMD_GENERATE_DB_INT));
 203
 204         status = le16_to_cpu(READ_ONCE(generic_comm_base->status));
 205         status &= ~PCC_STS_CMD_COMPLETE;
 206         WRITE_ONCE(generic_comm_base->status, cpu_to_le16(status));
 207
 208         /* Copy the message to the PCC comm space */
 209         for (i = 0; i < SLIMPRO_IIC_MSG_DWORD_COUNT; i++)
 210                 WRITE_ONCE(ptr[i], cpu_to_le32(msg[i]));
 211 }
 212
 213 static int start_i2c_msg_xfer(struct slimpro_i2c_dev *ctx)
 214 {
 215         if (ctx->mbox_client.tx_block || !acpi_disabled) {
 216                 if (!wait_for_completion_timeout(&ctx->rd_complete,
 217                                                  msecs_to_jiffies(MAILBOX_OP_TIMEOUT)))
 218                         return -ETIMEDOUT;
 219         }
 220
 221         /* Check of invalid data or no device */
 222         if (*ctx->resp_msg == 0xffffffff)
 223                 return -ENODEV;
 224
 225         return 0;
 226 }
 227
 228 static int slimpro_i2c_send_msg(struct slimpro_i2c_dev *ctx,
 229                                 u32 *msg,
 230                                 u32 *data)
 231 {
 232         int rc;
 233
 234         ctx->resp_msg = data;
 235
 236         if (!acpi_disabled) {
 237                 reinit_completion(&ctx->rd_complete);
 238                 slimpro_i2c_pcc_tx_prepare(ctx, msg);
 239         }
 240
 241         rc = mbox_send_message(ctx->mbox_chan, msg);
 242         if (rc < 0)
 243                 goto err;
 244
 245         rc = start_i2c_msg_xfer(ctx);
 246
 247 err:
 248         if (!acpi_disabled)
 249                 mbox_chan_txdone(ctx->mbox_chan, 0);
 250
 251         ctx->resp_msg = NULL;
 252
 253         return rc;
 254 }
 255
 256 static int slimpro_i2c_rd(struct slimpro_i2c_dev *ctx, u32 chip,
 257                           u32 addr, u32 addrlen, u32 protocol,
 258                           u32 readlen, u32 *data)
 259 {
 260         u32 msg[3];
 261
 262         msg[0] = SLIMPRO_IIC_ENCODE_MSG(SLIMPRO_IIC_BUS, chip,
 263                                         SLIMPRO_IIC_READ, protocol, addrlen, readlen);
 264         msg[1] = SLIMPRO_IIC_ENCODE_ADDR(addr);
 265         msg[2] = 0;
 266
 267         return slimpro_i2c_send_msg(ctx, msg, data);
 268 }
 269
 270 static int slimpro_i2c_wr(struct slimpro_i2c_dev *ctx, u32 chip,
 271                           u32 addr, u32 addrlen, u32 protocol, u32 writelen,
 272                           u32 data)
 273 {
 274         u32 msg[3];
 275
 276         msg[0] = SLIMPRO_IIC_ENCODE_MSG(SLIMPRO_IIC_BUS, chip,
 277                                         SLIMPRO_IIC_WRITE, protocol, addrlen, writelen);
 278         msg[1] = SLIMPRO_IIC_ENCODE_ADDR(addr);
 279         msg[2] = data;
 280
 281         return slimpro_i2c_send_msg(ctx, msg, msg);
 282 }
 283
 284 static int slimpro_i2c_blkrd(struct slimpro_i2c_dev *ctx, u32 chip, u32 addr,
 285                              u32 addrlen, u32 protocol, u32 readlen,
 286                              u32 with_data_len, void *data)
 287 {
 288         dma_addr_t paddr;
 289         u32 msg[3];
 290         int rc;
 291
 292         paddr = dma_map_single(ctx->dev, ctx->dma_buffer, readlen, DMA_FROM_DEVICE);
 293         if (dma_mapping_error(ctx->dev, paddr)) {
 294                 dev_err(&ctx->adapter.dev, "Error in mapping dma buffer %p\n",
 295                         ctx->dma_buffer);
 296                 return -ENOMEM;
 297         }
 298
 299         msg[0] = SLIMPRO_IIC_ENCODE_MSG(SLIMPRO_IIC_BUS, chip, SLIMPRO_IIC_READ,
 300                                         protocol, addrlen, readlen);
 301         msg[1] = SLIMPRO_IIC_ENCODE_FLAG_BUFADDR |
 302                  SLIMPRO_IIC_ENCODE_FLAG_WITH_DATA_LEN(with_data_len) |
 303                  SLIMPRO_IIC_ENCODE_UPPER_BUFADDR(paddr) |
 304                  SLIMPRO_IIC_ENCODE_ADDR(addr);
 305         msg[2] = (u32)paddr;
 306
 307         rc = slimpro_i2c_send_msg(ctx, msg, msg);
 308
 309         /* Copy to destination */
 310         memcpy(data, ctx->dma_buffer, readlen);
 311
 312         dma_unmap_single(ctx->dev, paddr, readlen, DMA_FROM_DEVICE);
 313         return rc;
 314 }
 315
 316 static int slimpro_i2c_blkwr(struct slimpro_i2c_dev *ctx, u32 chip,
 317                              u32 addr, u32 addrlen, u32 protocol, u32 writelen,
 318                              void *data)
 319 {
 320         dma_addr_t paddr;
 321         u32 msg[3];
 322         int rc;
 323
 324         if (writelen > I2C_SMBUS_BLOCK_MAX)
 325                 return -EINVAL;
 326
 327         memcpy(ctx->dma_buffer, data, writelen);
 328         paddr = dma_map_single(ctx->dev, ctx->dma_buffer, writelen,
 329                                DMA_TO_DEVICE);
 330         if (dma_mapping_error(ctx->dev, paddr)) {
 331                 dev_err(&ctx->adapter.dev, "Error in mapping dma buffer %p\n",
 332                         ctx->dma_buffer);
 333                 return -ENOMEM;
 334         }
 335
 336         msg[0] = SLIMPRO_IIC_ENCODE_MSG(SLIMPRO_IIC_BUS, chip, SLIMPRO_IIC_WRITE,
 337                                         protocol, addrlen, writelen);
 338         msg[1] = SLIMPRO_IIC_ENCODE_FLAG_BUFADDR |
 339                  SLIMPRO_IIC_ENCODE_UPPER_BUFADDR(paddr) |
 340                  SLIMPRO_IIC_ENCODE_ADDR(addr);
 341         msg[2] = (u32)paddr;
 342
 343         if (ctx->mbox_client.tx_block)
 344                 reinit_completion(&ctx->rd_complete);
 345
 346         rc = slimpro_i2c_send_msg(ctx, msg, msg);
 347
 348         dma_unmap_single(ctx->dev, paddr, writelen, DMA_TO_DEVICE);
 349         return rc;
 350 }
 351
 352 static int xgene_slimpro_i2c_xfer(struct i2c_adapter *adap, u16 addr,
 353                                   unsigned short flags, char read_write,
 354                                   u8 command, int size,
 355                                   union i2c_smbus_data *data)
 356 {
 357         struct slimpro_i2c_dev *ctx = i2c_get_adapdata(adap);
 358         int ret = -EOPNOTSUPP;
 359         u32 val;
 360
 361         switch (size) {
 362         case I2C_SMBUS_BYTE:
 363                 if (read_write == I2C_SMBUS_READ) {
 364                         ret = slimpro_i2c_rd(ctx, addr, 0, 0,
 365                                              SLIMPRO_IIC_SMB_PROTOCOL,
 366                                              BYTE_DATA, &val);
 367                         data->byte = val;
 368                 } else {
 369                         ret = slimpro_i2c_wr(ctx, addr, command, SMBUS_CMD_LEN,
 370                                              SLIMPRO_IIC_SMB_PROTOCOL,
 371                                              0, 0);
 372                 }
 373                 break;
 374         case I2C_SMBUS_BYTE_DATA:
 375                 if (read_write == I2C_SMBUS_READ) {
 376                         ret = slimpro_i2c_rd(ctx, addr, command, SMBUS_CMD_LEN,
 377                                              SLIMPRO_IIC_SMB_PROTOCOL,
 378                                              BYTE_DATA, &val);
 379                         data->byte = val;
 380                 } else {
 381                         val = data->byte;
 382                         ret = slimpro_i2c_wr(ctx, addr, command, SMBUS_CMD_LEN,
 383                                              SLIMPRO_IIC_SMB_PROTOCOL,
 384                                              BYTE_DATA, val);
 385                 }
 386                 break;
 387         case I2C_SMBUS_WORD_DATA:
 388                 if (read_write == I2C_SMBUS_READ) {
 389                         ret = slimpro_i2c_rd(ctx, addr, command, SMBUS_CMD_LEN,
 390                                              SLIMPRO_IIC_SMB_PROTOCOL,
 391                                              WORD_DATA, &val);
 392                         data->word = val;
 393                 } else {
 394                         val = data->word;
 395                         ret = slimpro_i2c_wr(ctx, addr, command, SMBUS_CMD_LEN,
 396                                              SLIMPRO_IIC_SMB_PROTOCOL,
 397                                              WORD_DATA, val);
 398                 }
 399                 break;
 400         case I2C_SMBUS_BLOCK_DATA:
 401                 if (read_write == I2C_SMBUS_READ) {
 402                         ret = slimpro_i2c_blkrd(ctx, addr, command,
 403                                                 SMBUS_CMD_LEN,
 404                                                 SLIMPRO_IIC_SMB_PROTOCOL,
 405                                                 I2C_SMBUS_BLOCK_MAX + 1,
 406                                                 IIC_SMB_WITH_DATA_LEN,
 407                                                 &data->block[0]);
 408
 409                 } else {
 410                         ret = slimpro_i2c_blkwr(ctx, addr, command,
 411                                                 SMBUS_CMD_LEN,
 412                                                 SLIMPRO_IIC_SMB_PROTOCOL,
 413                                                 data->block[0] + 1,
 414                                                 &data->block[0]);
 415                 }
 416                 break;
 417         case I2C_SMBUS_I2C_BLOCK_DATA:
 418                 if (read_write == I2C_SMBUS_READ) {
 419                         ret = slimpro_i2c_blkrd(ctx, addr,
 420                                                 command,
 421                                                 SMBUS_CMD_LEN,
 422                                                 SLIMPRO_IIC_I2C_PROTOCOL,
 423                                                 I2C_SMBUS_BLOCK_MAX,
 424                                                 IIC_SMB_WITHOUT_DATA_LEN,
 425                                                 &data->block[1]);
 426                 } else {
 427                         ret = slimpro_i2c_blkwr(ctx, addr, command,
 428                                                 SMBUS_CMD_LEN,
 429                                                 SLIMPRO_IIC_I2C_PROTOCOL,
 430                                                 data->block[0],
 431                                                 &data->block[1]);
 432                 }
 433                 break;
 434         default:
 435                 break;
 436         }
 437         return ret;
 438 }
 439
 440 /*
 441 * Return list of supported functionality.
 442 */
 443 static u32 xgene_slimpro_i2c_func(struct i2c_adapter *adapter)
 444 {
 445         return I2C_FUNC_SMBUS_BYTE |
 446                 I2C_FUNC_SMBUS_BYTE_DATA |
 447                 I2C_FUNC_SMBUS_WORD_DATA |
 448                 I2C_FUNC_SMBUS_BLOCK_DATA |
 449                 I2C_FUNC_SMBUS_I2C_BLOCK;
 450 }
 451
 452 static const struct i2c_algorithm xgene_slimpro_i2c_algorithm = {
 453         .smbus_xfer = xgene_slimpro_i2c_xfer,
 454         .functionality = xgene_slimpro_i2c_func,
 455 };
 456
 457 static int xgene_slimpro_i2c_probe(struct platform_device *pdev)
 458 {
 459         struct slimpro_i2c_dev *ctx;
 460         struct i2c_adapter *adapter;
 461         struct mbox_client *cl;
 462         int rc;
 463
 464         ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
 465         if (!ctx)
 466                 return -ENOMEM;
 467
 468         ctx->dev = &pdev->dev;
 469         platform_set_drvdata(pdev, ctx);
 470         cl = &ctx->mbox_client;
 471
 472         /* Request mailbox channel */
 473         cl->dev = &pdev->dev;
 474         init_completion(&ctx->rd_complete);
 475         cl->tx_tout = MAILBOX_OP_TIMEOUT;
 476         cl->knows_txdone = false;
 477         if (acpi_disabled) {
 478                 cl->tx_block = true;
 479                 cl->rx_callback = slimpro_i2c_rx_cb;
 480                 ctx->mbox_chan = mbox_request_channel(cl, MAILBOX_I2C_INDEX);
 481                 if (IS_ERR(ctx->mbox_chan)) {
 482                         dev_err(&pdev->dev, "i2c mailbox channel request failed\n");
 483                         return PTR_ERR(ctx->mbox_chan);
 484                 }
 485         } else {
 486                 struct acpi_pcct_hw_reduced *cppc_ss;
 487                 const struct acpi_device_id *acpi_id;
 488                 int version = XGENE_SLIMPRO_I2C_V1;
 489
 490                 acpi_id = acpi_match_device(pdev->dev.driver->acpi_match_table,
 491                                             &pdev->dev);
 492                 if (!acpi_id)
 493                         return -EINVAL;
 494
 495                 version = (int)acpi_id->driver_data;
 496
 497                 if (device_property_read_u32(&pdev->dev, "pcc-channel",
 498                                              &ctx->mbox_idx))
 499                         ctx->mbox_idx = MAILBOX_I2C_INDEX;
 500
 501                 cl->tx_block = false;
 502                 cl->rx_callback = slimpro_i2c_pcc_rx_cb;
 503                 ctx->mbox_chan = pcc_mbox_request_channel(cl, ctx->mbox_idx);
 504                 if (IS_ERR(ctx->mbox_chan)) {
 505                         dev_err(&pdev->dev, "PCC mailbox channel request failed\n");
 506                         return PTR_ERR(ctx->mbox_chan);
 507                 }
 508
 509                 /*
 510                  * The PCC mailbox controller driver should
 511                  * have parsed the PCCT (global table of all
 512                  * PCC channels) and stored pointers to the
 513                  * subspace communication region in con_priv.
 514                  */
 515                 cppc_ss = ctx->mbox_chan->con_priv;
 516                 if (!cppc_ss) {
 517                         dev_err(&pdev->dev, "PPC subspace not found\n");
 518                         rc = -ENOENT;
 519                         goto mbox_err;
 520                 }
 521
 522                 if (!ctx->mbox_chan->mbox->txdone_irq) {
 523                         dev_err(&pdev->dev, "PCC IRQ not supported\n");
 524                         rc = -ENOENT;
 525                         goto mbox_err;
 526                 }
 527
 528                 /*
 529                  * This is the shared communication region
 530                  * for the OS and Platform to communicate over.
 531                  */
 532                 ctx->comm_base_addr = cppc_ss->base_address;
 533                 if (ctx->comm_base_addr) {
 534                         if (version == XGENE_SLIMPRO_I2C_V2)
 535                                 ctx->pcc_comm_addr = memremap(
 536                                                         ctx->comm_base_addr,
 537                                                         cppc_ss->length,
 538                                                         MEMREMAP_WT);
 539                         else
 540                                 ctx->pcc_comm_addr = memremap(
 541                                                         ctx->comm_base_addr,
 542                                                         cppc_ss->length,
 543                                                         MEMREMAP_WB);
 544                 } else {
 545                         dev_err(&pdev->dev, "Failed to get PCC comm region\n");
 546                         rc = -ENOENT;
 547                         goto mbox_err;
 548                 }
 549
 550                 if (!ctx->pcc_comm_addr) {
 551                         dev_err(&pdev->dev,
 552                                 "Failed to ioremap PCC comm region\n");
 553                         rc = -ENOMEM;
 554                         goto mbox_err;
 555                 }
 556         }
 557         rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
 558         if (rc)
 559                 dev_warn(&pdev->dev, "Unable to set dma mask\n");
 560
 561         /* Setup I2C adapter */
 562         adapter = &ctx->adapter;
 563         snprintf(adapter->name, sizeof(adapter->name), "MAILBOX I2C");
 564         adapter->algo = &xgene_slimpro_i2c_algorithm;
 565         adapter->class = I2C_CLASS_HWMON;
 566         adapter->dev.parent = &pdev->dev;
 567         adapter->dev.of_node = pdev->dev.of_node;
 568         ACPI_COMPANION_SET(&adapter->dev, ACPI_COMPANION(&pdev->dev));
 569         i2c_set_adapdata(adapter, ctx);
 570         rc = i2c_add_adapter(adapter);
 571         if (rc)
 572                 goto mbox_err;
 573
 574         dev_info(&pdev->dev, "Mailbox I2C Adapter registered\n");
 575         return 0;
 576
 577 mbox_err:
 578         if (acpi_disabled)
 579                 mbox_free_channel(ctx->mbox_chan);
 580         else
 581                 pcc_mbox_free_channel(ctx->mbox_chan);
 582
 583         return rc;
 584 }
 585
 586 static int xgene_slimpro_i2c_remove(struct platform_device *pdev)
 587 {
 588         struct slimpro_i2c_dev *ctx = platform_get_drvdata(pdev);
 589
 590         i2c_del_adapter(&ctx->adapter);
 591
 592         if (acpi_disabled)
 593                 mbox_free_channel(ctx->mbox_chan);
 594         else
 595                 pcc_mbox_free_channel(ctx->mbox_chan);
 596
 597         return 0;
 598 }
 599
 600 static const struct of_device_id xgene_slimpro_i2c_dt_ids[] = {
 601         {.compatible = "apm,xgene-slimpro-i2c" },
 602         {},
 603 };
 604 MODULE_DEVICE_TABLE(of, xgene_slimpro_i2c_dt_ids);
 605
 606 #ifdef CONFIG_ACPI
 607 static const struct acpi_device_id xgene_slimpro_i2c_acpi_ids[] = {
 608         {"APMC0D40", XGENE_SLIMPRO_I2C_V1},
 609         {"APMC0D8B", XGENE_SLIMPRO_I2C_V2},
 610         {}
 611 };
 612 MODULE_DEVICE_TABLE(acpi, xgene_slimpro_i2c_acpi_ids);
 613 #endif
 614
 615 static struct platform_driver xgene_slimpro_i2c_driver = {
 616         .probe  = xgene_slimpro_i2c_probe,
 617         .remove = xgene_slimpro_i2c_remove,
 618         .driver = {
 619                 .name   = "xgene-slimpro-i2c",
 620                 .of_match_table = of_match_ptr(xgene_slimpro_i2c_dt_ids),
 621                 .acpi_match_table = ACPI_PTR(xgene_slimpro_i2c_acpi_ids)
 622         },
 623 };
 624
 625 module_platform_driver(xgene_slimpro_i2c_driver);
 626
 627 MODULE_DESCRIPTION("APM X-Gene SLIMpro I2C driver");
 628 MODULE_AUTHOR("Feng Kan <fkan@apm.com>");
 629 MODULE_AUTHOR("Hieu Le <hnle@apm.com>");
 630 MODULE_LICENSE("GPL");