Pileus Git - ~andy/linux/blob - drivers/spi/spi-topcliff-pch.c

   1 /*
   2  * SPI bus driver for the Topcliff PCH used by Intel SoCs
   3  *
   4  * Copyright (C) 2011 LAPIS Semiconductor Co., Ltd.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; version 2 of the License.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307, USA.
  18  */
  19
  20 #include <linux/delay.h>
  21 #include <linux/pci.h>
  22 #include <linux/wait.h>
  23 #include <linux/spi/spi.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/sched.h>
  26 #include <linux/spi/spidev.h>
  27 #include <linux/module.h>
  28 #include <linux/device.h>
  29 #include <linux/platform_device.h>
  30
  31 #include <linux/dmaengine.h>
  32 #include <linux/pch_dma.h>
  33
  34 /* Register offsets */
  35 #define PCH_SPCR                0x00    /* SPI control register */
  36 #define PCH_SPBRR               0x04    /* SPI baud rate register */
  37 #define PCH_SPSR                0x08    /* SPI status register */
  38 #define PCH_SPDWR               0x0C    /* SPI write data register */
  39 #define PCH_SPDRR               0x10    /* SPI read data register */
  40 #define PCH_SSNXCR              0x18    /* SSN Expand Control Register */
  41 #define PCH_SRST                0x1C    /* SPI reset register */
  42 #define PCH_ADDRESS_SIZE        0x20
  43
  44 #define PCH_SPSR_TFD            0x000007C0
  45 #define PCH_SPSR_RFD            0x0000F800
  46
  47 #define PCH_READABLE(x)         (((x) & PCH_SPSR_RFD)>>11)
  48 #define PCH_WRITABLE(x)         (((x) & PCH_SPSR_TFD)>>6)
  49
  50 #define PCH_RX_THOLD            7
  51 #define PCH_RX_THOLD_MAX        15
  52
  53 #define PCH_TX_THOLD            2
  54
  55 #define PCH_MAX_BAUDRATE        5000000
  56 #define PCH_MAX_FIFO_DEPTH      16
  57
  58 #define STATUS_RUNNING          1
  59 #define STATUS_EXITING          2
  60 #define PCH_SLEEP_TIME          10
  61
  62 #define SSN_LOW                 0x02U
  63 #define SSN_HIGH                0x03U
  64 #define SSN_NO_CONTROL          0x00U
  65 #define PCH_MAX_CS              0xFF
  66 #define PCI_DEVICE_ID_GE_SPI    0x8816
  67
  68 #define SPCR_SPE_BIT            (1 << 0)
  69 #define SPCR_MSTR_BIT           (1 << 1)
  70 #define SPCR_LSBF_BIT           (1 << 4)
  71 #define SPCR_CPHA_BIT           (1 << 5)
  72 #define SPCR_CPOL_BIT           (1 << 6)
  73 #define SPCR_TFIE_BIT           (1 << 8)
  74 #define SPCR_RFIE_BIT           (1 << 9)
  75 #define SPCR_FIE_BIT            (1 << 10)
  76 #define SPCR_ORIE_BIT           (1 << 11)
  77 #define SPCR_MDFIE_BIT          (1 << 12)
  78 #define SPCR_FICLR_BIT          (1 << 24)
  79 #define SPSR_TFI_BIT            (1 << 0)
  80 #define SPSR_RFI_BIT            (1 << 1)
  81 #define SPSR_FI_BIT             (1 << 2)
  82 #define SPSR_ORF_BIT            (1 << 3)
  83 #define SPBRR_SIZE_BIT          (1 << 10)
  84
  85 #define PCH_ALL                 (SPCR_TFIE_BIT|SPCR_RFIE_BIT|SPCR_FIE_BIT|\
  86                                 SPCR_ORIE_BIT|SPCR_MDFIE_BIT)
  87
  88 #define SPCR_RFIC_FIELD         20
  89 #define SPCR_TFIC_FIELD         16
  90
  91 #define MASK_SPBRR_SPBR_BITS    ((1 << 10) - 1)
  92 #define MASK_RFIC_SPCR_BITS     (0xf << SPCR_RFIC_FIELD)
  93 #define MASK_TFIC_SPCR_BITS     (0xf << SPCR_TFIC_FIELD)
  94
  95 #define PCH_CLOCK_HZ            50000000
  96 #define PCH_MAX_SPBR            1023
  97
  98 /* Definition for ML7213/ML7223/ML7831 by LAPIS Semiconductor */
  99 #define PCI_VENDOR_ID_ROHM              0x10DB
 100 #define PCI_DEVICE_ID_ML7213_SPI        0x802c
 101 #define PCI_DEVICE_ID_ML7223_SPI        0x800F
 102 #define PCI_DEVICE_ID_ML7831_SPI        0x8816
 103
 104 /*
 105  * Set the number of SPI instance max
 106  * Intel EG20T PCH :            1ch
 107  * LAPIS Semiconductor ML7213 IOH :     2ch
 108  * LAPIS Semiconductor ML7223 IOH :     1ch
 109  * LAPIS Semiconductor ML7831 IOH :     1ch
 110 */
 111 #define PCH_SPI_MAX_DEV                 2
 112
 113 #define PCH_BUF_SIZE            4096
 114 #define PCH_DMA_TRANS_SIZE      12
 115
 116 static int use_dma = 1;
 117
 118 struct pch_spi_dma_ctrl {
 119         struct dma_async_tx_descriptor  *desc_tx;
 120         struct dma_async_tx_descriptor  *desc_rx;
 121         struct pch_dma_slave            param_tx;
 122         struct pch_dma_slave            param_rx;
 123         struct dma_chan         *chan_tx;
 124         struct dma_chan         *chan_rx;
 125         struct scatterlist              *sg_tx_p;
 126         struct scatterlist              *sg_rx_p;
 127         struct scatterlist              sg_tx;
 128         struct scatterlist              sg_rx;
 129         int                             nent;
 130         void                            *tx_buf_virt;
 131         void                            *rx_buf_virt;
 132         dma_addr_t                      tx_buf_dma;
 133         dma_addr_t                      rx_buf_dma;
 134 };
 135 /**
 136  * struct pch_spi_data - Holds the SPI channel specific details
 137  * @io_remap_addr:              The remapped PCI base address
 138  * @master:                     Pointer to the SPI master structure
 139  * @work:                       Reference to work queue handler
 140  * @wk:                         Workqueue for carrying out execution of the
 141  *                              requests
 142  * @wait:                       Wait queue for waking up upon receiving an
 143  *                              interrupt.
 144  * @transfer_complete:          Status of SPI Transfer
 145  * @bcurrent_msg_processing:    Status flag for message processing
 146  * @lock:                       Lock for protecting this structure
 147  * @queue:                      SPI Message queue
 148  * @status:                     Status of the SPI driver
 149  * @bpw_len:                    Length of data to be transferred in bits per
 150  *                              word
 151  * @transfer_active:            Flag showing active transfer
 152  * @tx_index:                   Transmit data count; for bookkeeping during
 153  *                              transfer
 154  * @rx_index:                   Receive data count; for bookkeeping during
 155  *                              transfer
 156  * @tx_buff:                    Buffer for data to be transmitted
 157  * @rx_index:                   Buffer for Received data
 158  * @n_curnt_chip:               The chip number that this SPI driver currently
 159  *                              operates on
 160  * @current_chip:               Reference to the current chip that this SPI
 161  *                              driver currently operates on
 162  * @current_msg:                The current message that this SPI driver is
 163  *                              handling
 164  * @cur_trans:                  The current transfer that this SPI driver is
 165  *                              handling
 166  * @board_dat:                  Reference to the SPI device data structure
 167  * @plat_dev:                   platform_device structure
 168  * @ch:                         SPI channel number
 169  * @irq_reg_sts:                Status of IRQ registration
 170  */
 171 struct pch_spi_data {
 172         void __iomem *io_remap_addr;
 173         unsigned long io_base_addr;
 174         struct spi_master *master;
 175         struct work_struct work;
 176         struct workqueue_struct *wk;
 177         wait_queue_head_t wait;
 178         u8 transfer_complete;
 179         u8 bcurrent_msg_processing;
 180         spinlock_t lock;
 181         struct list_head queue;
 182         u8 status;
 183         u32 bpw_len;
 184         u8 transfer_active;
 185         u32 tx_index;
 186         u32 rx_index;
 187         u16 *pkt_tx_buff;
 188         u16 *pkt_rx_buff;
 189         u8 n_curnt_chip;
 190         struct spi_device *current_chip;
 191         struct spi_message *current_msg;
 192         struct spi_transfer *cur_trans;
 193         struct pch_spi_board_data *board_dat;
 194         struct platform_device  *plat_dev;
 195         int ch;
 196         struct pch_spi_dma_ctrl dma;
 197         int use_dma;
 198         u8 irq_reg_sts;
 199         int save_total_len;
 200 };
 201
 202 /**
 203  * struct pch_spi_board_data - Holds the SPI device specific details
 204  * @pdev:               Pointer to the PCI device
 205  * @suspend_sts:        Status of suspend
 206  * @num:                The number of SPI device instance
 207  */
 208 struct pch_spi_board_data {
 209         struct pci_dev *pdev;
 210         u8 suspend_sts;
 211         int num;
 212 };
 213
 214 struct pch_pd_dev_save {
 215         int num;
 216         struct platform_device *pd_save[PCH_SPI_MAX_DEV];
 217         struct pch_spi_board_data *board_dat;
 218 };
 219
 220 static const struct pci_device_id pch_spi_pcidev_id[] = {
 221         { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_GE_SPI),    1, },
 222         { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7213_SPI), 2, },
 223         { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7223_SPI), 1, },
 224         { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7831_SPI), 1, },
 225         { }
 226 };
 227
 228 /**
 229  * pch_spi_writereg() - Performs  register writes
 230  * @master:     Pointer to struct spi_master.
 231  * @idx:        Register offset.
 232  * @val:        Value to be written to register.
 233  */
 234 static inline void pch_spi_writereg(struct spi_master *master, int idx, u32 val)
 235 {
 236         struct pch_spi_data *data = spi_master_get_devdata(master);
 237         iowrite32(val, (data->io_remap_addr + idx));
 238 }
 239
 240 /**
 241  * pch_spi_readreg() - Performs register reads
 242  * @master:     Pointer to struct spi_master.
 243  * @idx:        Register offset.
 244  */
 245 static inline u32 pch_spi_readreg(struct spi_master *master, int idx)
 246 {
 247         struct pch_spi_data *data = spi_master_get_devdata(master);
 248         return ioread32(data->io_remap_addr + idx);
 249 }
 250
 251 static inline void pch_spi_setclr_reg(struct spi_master *master, int idx,
 252                                       u32 set, u32 clr)
 253 {
 254         u32 tmp = pch_spi_readreg(master, idx);
 255         tmp = (tmp & ~clr) | set;
 256         pch_spi_writereg(master, idx, tmp);
 257 }
 258
 259 static void pch_spi_set_master_mode(struct spi_master *master)
 260 {
 261         pch_spi_setclr_reg(master, PCH_SPCR, SPCR_MSTR_BIT, 0);
 262 }
 263
 264 /**
 265  * pch_spi_clear_fifo() - Clears the Transmit and Receive FIFOs
 266  * @master:     Pointer to struct spi_master.
 267  */
 268 static void pch_spi_clear_fifo(struct spi_master *master)
 269 {
 270         pch_spi_setclr_reg(master, PCH_SPCR, SPCR_FICLR_BIT, 0);
 271         pch_spi_setclr_reg(master, PCH_SPCR, 0, SPCR_FICLR_BIT);
 272 }
 273
 274 static void pch_spi_handler_sub(struct pch_spi_data *data, u32 reg_spsr_val,
 275                                 void __iomem *io_remap_addr)
 276 {
 277         u32 n_read, tx_index, rx_index, bpw_len;
 278         u16 *pkt_rx_buffer, *pkt_tx_buff;
 279         int read_cnt;
 280         u32 reg_spcr_val;
 281         void __iomem *spsr;
 282         void __iomem *spdrr;
 283         void __iomem *spdwr;
 284
 285         spsr = io_remap_addr + PCH_SPSR;
 286         iowrite32(reg_spsr_val, spsr);
 287
 288         if (data->transfer_active) {
 289                 rx_index = data->rx_index;
 290                 tx_index = data->tx_index;
 291                 bpw_len = data->bpw_len;
 292                 pkt_rx_buffer = data->pkt_rx_buff;
 293                 pkt_tx_buff = data->pkt_tx_buff;
 294
 295                 spdrr = io_remap_addr + PCH_SPDRR;
 296                 spdwr = io_remap_addr + PCH_SPDWR;
 297
 298                 n_read = PCH_READABLE(reg_spsr_val);
 299
 300                 for (read_cnt = 0; (read_cnt < n_read); read_cnt++) {
 301                         pkt_rx_buffer[rx_index++] = ioread32(spdrr);
 302                         if (tx_index < bpw_len)
 303                                 iowrite32(pkt_tx_buff[tx_index++], spdwr);
 304                 }
 305
 306                 /* disable RFI if not needed */
 307                 if ((bpw_len - rx_index) <= PCH_MAX_FIFO_DEPTH) {
 308                         reg_spcr_val = ioread32(io_remap_addr + PCH_SPCR);
 309                         reg_spcr_val &= ~SPCR_RFIE_BIT; /* disable RFI */
 310
 311                         /* reset rx threshold */
 312                         reg_spcr_val &= ~MASK_RFIC_SPCR_BITS;
 313                         reg_spcr_val |= (PCH_RX_THOLD_MAX << SPCR_RFIC_FIELD);
 314
 315                         iowrite32(reg_spcr_val, (io_remap_addr + PCH_SPCR));
 316                 }
 317
 318                 /* update counts */
 319                 data->tx_index = tx_index;
 320                 data->rx_index = rx_index;
 321
 322                 /* if transfer complete interrupt */
 323                 if (reg_spsr_val & SPSR_FI_BIT) {
 324                         if ((tx_index == bpw_len) && (rx_index == tx_index)) {
 325                                 /* disable interrupts */
 326                                 pch_spi_setclr_reg(data->master, PCH_SPCR, 0,
 327                                                    PCH_ALL);
 328
 329                                 /* transfer is completed;
 330                                    inform pch_spi_process_messages */
 331                                 data->transfer_complete = true;
 332                                 data->transfer_active = false;
 333                                 wake_up(&data->wait);
 334                         } else {
 335                                 dev_err(&data->master->dev,
 336                                         "%s : Transfer is not completed",
 337                                         __func__);
 338                         }
 339                 }
 340         }
 341 }
 342
 343 /**
 344  * pch_spi_handler() - Interrupt handler
 345  * @irq:        The interrupt number.
 346  * @dev_id:     Pointer to struct pch_spi_board_data.
 347  */
 348 static irqreturn_t pch_spi_handler(int irq, void *dev_id)
 349 {
 350         u32 reg_spsr_val;
 351         void __iomem *spsr;
 352         void __iomem *io_remap_addr;
 353         irqreturn_t ret = IRQ_NONE;
 354         struct pch_spi_data *data = dev_id;
 355         struct pch_spi_board_data *board_dat = data->board_dat;
 356
 357         if (board_dat->suspend_sts) {
 358                 dev_dbg(&board_dat->pdev->dev,
 359                         "%s returning due to suspend\n", __func__);
 360                 return IRQ_NONE;
 361         }
 362
 363         io_remap_addr = data->io_remap_addr;
 364         spsr = io_remap_addr + PCH_SPSR;
 365
 366         reg_spsr_val = ioread32(spsr);
 367
 368         if (reg_spsr_val & SPSR_ORF_BIT) {
 369                 dev_err(&board_dat->pdev->dev, "%s Over run error\n", __func__);
 370                 if (data->current_msg->complete) {
 371                         data->transfer_complete = true;
 372                         data->current_msg->status = -EIO;
 373                         data->current_msg->complete(data->current_msg->context);
 374                         data->bcurrent_msg_processing = false;
 375                         data->current_msg = NULL;
 376                         data->cur_trans = NULL;
 377                 }
 378         }
 379
 380         if (data->use_dma)
 381                 return IRQ_NONE;
 382
 383         /* Check if the interrupt is for SPI device */
 384         if (reg_spsr_val & (SPSR_FI_BIT | SPSR_RFI_BIT)) {
 385                 pch_spi_handler_sub(data, reg_spsr_val, io_remap_addr);
 386                 ret = IRQ_HANDLED;
 387         }
 388
 389         dev_dbg(&board_dat->pdev->dev, "%s EXIT return value=%d\n",
 390                 __func__, ret);
 391
 392         return ret;
 393 }
 394
 395 /**
 396  * pch_spi_set_baud_rate() - Sets SPBR field in SPBRR
 397  * @master:     Pointer to struct spi_master.
 398  * @speed_hz:   Baud rate.
 399  */
 400 static void pch_spi_set_baud_rate(struct spi_master *master, u32 speed_hz)
 401 {
 402         u32 n_spbr = PCH_CLOCK_HZ / (speed_hz * 2);
 403
 404         /* if baud rate is less than we can support limit it */
 405         if (n_spbr > PCH_MAX_SPBR)
 406                 n_spbr = PCH_MAX_SPBR;
 407
 408         pch_spi_setclr_reg(master, PCH_SPBRR, n_spbr, MASK_SPBRR_SPBR_BITS);
 409 }
 410
 411 /**
 412  * pch_spi_set_bits_per_word() - Sets SIZE field in SPBRR
 413  * @master:             Pointer to struct spi_master.
 414  * @bits_per_word:      Bits per word for SPI transfer.
 415  */
 416 static void pch_spi_set_bits_per_word(struct spi_master *master,
 417                                       u8 bits_per_word)
 418 {
 419         if (bits_per_word == 8)
 420                 pch_spi_setclr_reg(master, PCH_SPBRR, 0, SPBRR_SIZE_BIT);
 421         else
 422                 pch_spi_setclr_reg(master, PCH_SPBRR, SPBRR_SIZE_BIT, 0);
 423 }
 424
 425 /**
 426  * pch_spi_setup_transfer() - Configures the PCH SPI hardware for transfer
 427  * @spi:        Pointer to struct spi_device.
 428  */
 429 static void pch_spi_setup_transfer(struct spi_device *spi)
 430 {
 431         u32 flags = 0;
 432
 433         dev_dbg(&spi->dev, "%s SPBRR content =%x setting baud rate=%d\n",
 434                 __func__, pch_spi_readreg(spi->master, PCH_SPBRR),
 435                 spi->max_speed_hz);
 436         pch_spi_set_baud_rate(spi->master, spi->max_speed_hz);
 437
 438         /* set bits per word */
 439         pch_spi_set_bits_per_word(spi->master, spi->bits_per_word);
 440
 441         if (!(spi->mode & SPI_LSB_FIRST))
 442                 flags |= SPCR_LSBF_BIT;
 443         if (spi->mode & SPI_CPOL)
 444                 flags |= SPCR_CPOL_BIT;
 445         if (spi->mode & SPI_CPHA)
 446                 flags |= SPCR_CPHA_BIT;
 447         pch_spi_setclr_reg(spi->master, PCH_SPCR, flags,
 448                            (SPCR_LSBF_BIT | SPCR_CPOL_BIT | SPCR_CPHA_BIT));
 449
 450         /* Clear the FIFO by toggling  FICLR to 1 and back to 0 */
 451         pch_spi_clear_fifo(spi->master);
 452 }
 453
 454 /**
 455  * pch_spi_reset() - Clears SPI registers
 456  * @master:     Pointer to struct spi_master.
 457  */
 458 static void pch_spi_reset(struct spi_master *master)
 459 {
 460         /* write 1 to reset SPI */
 461         pch_spi_writereg(master, PCH_SRST, 0x1);
 462
 463         /* clear reset */
 464         pch_spi_writereg(master, PCH_SRST, 0x0);
 465 }
 466
 467 static int pch_spi_setup(struct spi_device *pspi)
 468 {
 469         /* Check baud rate setting */
 470         /* if baud rate of chip is greater than
 471            max we can support,return error */
 472         if ((pspi->max_speed_hz) > PCH_MAX_BAUDRATE)
 473                 pspi->max_speed_hz = PCH_MAX_BAUDRATE;
 474
 475         dev_dbg(&pspi->dev, "%s MODE = %x\n", __func__,
 476                 (pspi->mode) & (SPI_CPOL | SPI_CPHA));
 477
 478         return 0;
 479 }
 480
 481 static int pch_spi_transfer(struct spi_device *pspi, struct spi_message *pmsg)
 482 {
 483
 484         struct spi_transfer *transfer;
 485         struct pch_spi_data *data = spi_master_get_devdata(pspi->master);
 486         int retval;
 487         unsigned long flags;
 488
 489         /* validate spi message and baud rate */
 490         if (unlikely(list_empty(&pmsg->transfers) == 1)) {
 491                 dev_err(&pspi->dev, "%s list empty\n", __func__);
 492                 retval = -EINVAL;
 493                 goto err_out;
 494         }
 495
 496         if (unlikely(pspi->max_speed_hz == 0)) {
 497                 dev_err(&pspi->dev, "%s pch_spi_transfer maxspeed=%d\n",
 498                         __func__, pspi->max_speed_hz);
 499                 retval = -EINVAL;
 500                 goto err_out;
 501         }
 502
 503         dev_dbg(&pspi->dev,
 504                 "%s Transfer List not empty. Transfer Speed is set.\n", __func__);
 505
 506         spin_lock_irqsave(&data->lock, flags);
 507         /* validate Tx/Rx buffers and Transfer length */
 508         list_for_each_entry(transfer, &pmsg->transfers, transfer_list) {
 509                 if (!transfer->tx_buf && !transfer->rx_buf) {
 510                         dev_err(&pspi->dev,
 511                                 "%s Tx and Rx buffer NULL\n", __func__);
 512                         retval = -EINVAL;
 513                         goto err_return_spinlock;
 514                 }
 515
 516                 if (!transfer->len) {
 517                         dev_err(&pspi->dev, "%s Transfer length invalid\n",
 518                                 __func__);
 519                         retval = -EINVAL;
 520                         goto err_return_spinlock;
 521                 }
 522
 523                 dev_dbg(&pspi->dev,
 524                         "%s Tx/Rx buffer valid. Transfer length valid\n",
 525                         __func__);
 526
 527                 /* if baud rate has been specified validate the same */
 528                 if (transfer->speed_hz > PCH_MAX_BAUDRATE)
 529                         transfer->speed_hz = PCH_MAX_BAUDRATE;
 530         }
 531         spin_unlock_irqrestore(&data->lock, flags);
 532
 533         /* We won't process any messages if we have been asked to terminate */
 534         if (data->status == STATUS_EXITING) {
 535                 dev_err(&pspi->dev, "%s status = STATUS_EXITING.\n", __func__);
 536                 retval = -ESHUTDOWN;
 537                 goto err_out;
 538         }
 539
 540         /* If suspended ,return -EINVAL */
 541         if (data->board_dat->suspend_sts) {
 542                 dev_err(&pspi->dev, "%s suspend; returning EINVAL\n", __func__);
 543                 retval = -EINVAL;
 544                 goto err_out;
 545         }
 546
 547         /* set status of message */
 548         pmsg->actual_length = 0;
 549         dev_dbg(&pspi->dev, "%s - pmsg->status =%d\n", __func__, pmsg->status);
 550
 551         pmsg->status = -EINPROGRESS;
 552         spin_lock_irqsave(&data->lock, flags);
 553         /* add message to queue */
 554         list_add_tail(&pmsg->queue, &data->queue);
 555         spin_unlock_irqrestore(&data->lock, flags);
 556
 557         dev_dbg(&pspi->dev, "%s - Invoked list_add_tail\n", __func__);
 558
 559         /* schedule work queue to run */
 560         queue_work(data->wk, &data->work);
 561         dev_dbg(&pspi->dev, "%s - Invoked queue work\n", __func__);
 562
 563         retval = 0;
 564
 565 err_out:
 566         dev_dbg(&pspi->dev, "%s RETURN=%d\n", __func__, retval);
 567         return retval;
 568 err_return_spinlock:
 569         dev_dbg(&pspi->dev, "%s RETURN=%d\n", __func__, retval);
 570         spin_unlock_irqrestore(&data->lock, flags);
 571         return retval;
 572 }
 573
 574 static inline void pch_spi_select_chip(struct pch_spi_data *data,
 575                                        struct spi_device *pspi)
 576 {
 577         if (data->current_chip != NULL) {
 578                 if (pspi->chip_select != data->n_curnt_chip) {
 579                         dev_dbg(&pspi->dev, "%s : different slave\n", __func__);
 580                         data->current_chip = NULL;
 581                 }
 582         }
 583
 584         data->current_chip = pspi;
 585
 586         data->n_curnt_chip = data->current_chip->chip_select;
 587
 588         dev_dbg(&pspi->dev, "%s :Invoking pch_spi_setup_transfer\n", __func__);
 589         pch_spi_setup_transfer(pspi);
 590 }
 591
 592 static void pch_spi_set_tx(struct pch_spi_data *data, int *bpw)
 593 {
 594         int size;
 595         u32 n_writes;
 596         int j;
 597         struct spi_message *pmsg, *tmp;
 598         const u8 *tx_buf;
 599         const u16 *tx_sbuf;
 600
 601         /* set baud rate if needed */
 602         if (data->cur_trans->speed_hz) {
 603                 dev_dbg(&data->master->dev, "%s:setting baud rate\n", __func__);
 604                 pch_spi_set_baud_rate(data->master, data->cur_trans->speed_hz);
 605         }
 606
 607         /* set bits per word if needed */
 608         if (data->cur_trans->bits_per_word &&
 609             (data->current_msg->spi->bits_per_word != data->cur_trans->bits_per_word)) {
 610                 dev_dbg(&data->master->dev, "%s:set bits per word\n", __func__);
 611                 pch_spi_set_bits_per_word(data->master,
 612                                           data->cur_trans->bits_per_word);
 613                 *bpw = data->cur_trans->bits_per_word;
 614         } else {
 615                 *bpw = data->current_msg->spi->bits_per_word;
 616         }
 617
 618         /* reset Tx/Rx index */
 619         data->tx_index = 0;
 620         data->rx_index = 0;
 621
 622         data->bpw_len = data->cur_trans->len / (*bpw / 8);
 623
 624         /* find alloc size */
 625         size = data->cur_trans->len * sizeof(*data->pkt_tx_buff);
 626
 627         /* allocate memory for pkt_tx_buff & pkt_rx_buffer */
 628         data->pkt_tx_buff = kzalloc(size, GFP_KERNEL);
 629         if (data->pkt_tx_buff != NULL) {
 630                 data->pkt_rx_buff = kzalloc(size, GFP_KERNEL);
 631                 if (!data->pkt_rx_buff)
 632                         kfree(data->pkt_tx_buff);
 633         }
 634
 635         if (!data->pkt_rx_buff) {
 636                 /* flush queue and set status of all transfers to -ENOMEM */
 637                 dev_err(&data->master->dev, "%s :kzalloc failed\n", __func__);
 638                 list_for_each_entry_safe(pmsg, tmp, data->queue.next, queue) {
 639                         pmsg->status = -ENOMEM;
 640
 641                         if (pmsg->complete)
 642                                 pmsg->complete(pmsg->context);
 643
 644                         /* delete from queue */
 645                         list_del_init(&pmsg->queue);
 646                 }
 647                 return;
 648         }
 649
 650         /* copy Tx Data */
 651         if (data->cur_trans->tx_buf != NULL) {
 652                 if (*bpw == 8) {
 653                         tx_buf = data->cur_trans->tx_buf;
 654                         for (j = 0; j < data->bpw_len; j++)
 655                                 data->pkt_tx_buff[j] = *tx_buf++;
 656                 } else {
 657                         tx_sbuf = data->cur_trans->tx_buf;
 658                         for (j = 0; j < data->bpw_len; j++)
 659                                 data->pkt_tx_buff[j] = *tx_sbuf++;
 660                 }
 661         }
 662
 663         /* if len greater than PCH_MAX_FIFO_DEPTH, write 16,else len bytes */
 664         n_writes = data->bpw_len;
 665         if (n_writes > PCH_MAX_FIFO_DEPTH)
 666                 n_writes = PCH_MAX_FIFO_DEPTH;
 667
 668         dev_dbg(&data->master->dev, "\n%s:Pulling down SSN low - writing "
 669                 "0x2 to SSNXCR\n", __func__);
 670         pch_spi_writereg(data->master, PCH_SSNXCR, SSN_LOW);
 671
 672         for (j = 0; j < n_writes; j++)
 673                 pch_spi_writereg(data->master, PCH_SPDWR, data->pkt_tx_buff[j]);
 674
 675         /* update tx_index */
 676         data->tx_index = j;
 677
 678         /* reset transfer complete flag */
 679         data->transfer_complete = false;
 680         data->transfer_active = true;
 681 }
 682
 683 static void pch_spi_nomore_transfer(struct pch_spi_data *data)
 684 {
 685         struct spi_message *pmsg, *tmp;
 686         dev_dbg(&data->master->dev, "%s called\n", __func__);
 687         /* Invoke complete callback
 688          * [To the spi core..indicating end of transfer] */
 689         data->current_msg->status = 0;
 690
 691         if (data->current_msg->complete) {
 692                 dev_dbg(&data->master->dev,
 693                         "%s:Invoking callback of SPI core\n", __func__);
 694                 data->current_msg->complete(data->current_msg->context);
 695         }
 696
 697         /* update status in global variable */
 698         data->bcurrent_msg_processing = false;
 699
 700         dev_dbg(&data->master->dev,
 701                 "%s:data->bcurrent_msg_processing = false\n", __func__);
 702
 703         data->current_msg = NULL;
 704         data->cur_trans = NULL;
 705
 706         /* check if we have items in list and not suspending
 707          * return 1 if list empty */
 708         if ((list_empty(&data->queue) == 0) &&
 709             (!data->board_dat->suspend_sts) &&
 710             (data->status != STATUS_EXITING)) {
 711                 /* We have some more work to do (either there is more tranint
 712                  * bpw;sfer requests in the current message or there are
 713                  *more messages)
 714                  */
 715                 dev_dbg(&data->master->dev, "%s:Invoke queue_work\n", __func__);
 716                 queue_work(data->wk, &data->work);
 717         } else if (data->board_dat->suspend_sts ||
 718                    data->status == STATUS_EXITING) {
 719                 dev_dbg(&data->master->dev,
 720                         "%s suspend/remove initiated, flushing queue\n",
 721                         __func__);
 722                 list_for_each_entry_safe(pmsg, tmp, data->queue.next, queue) {
 723                         pmsg->status = -EIO;
 724
 725                         if (pmsg->complete)
 726                                 pmsg->complete(pmsg->context);
 727
 728                         /* delete from queue */
 729                         list_del_init(&pmsg->queue);
 730                 }
 731         }
 732 }
 733
 734 static void pch_spi_set_ir(struct pch_spi_data *data)
 735 {
 736         /* enable interrupts, set threshold, enable SPI */
 737         if ((data->bpw_len) > PCH_MAX_FIFO_DEPTH)
 738                 /* set receive threshold to PCH_RX_THOLD */
 739                 pch_spi_setclr_reg(data->master, PCH_SPCR,
 740                                    PCH_RX_THOLD << SPCR_RFIC_FIELD |
 741                                    SPCR_FIE_BIT | SPCR_RFIE_BIT |
 742                                    SPCR_ORIE_BIT | SPCR_SPE_BIT,
 743                                    MASK_RFIC_SPCR_BITS | PCH_ALL);
 744         else
 745                 /* set receive threshold to maximum */
 746                 pch_spi_setclr_reg(data->master, PCH_SPCR,
 747                                    PCH_RX_THOLD_MAX << SPCR_RFIC_FIELD |
 748                                    SPCR_FIE_BIT | SPCR_ORIE_BIT |
 749                                    SPCR_SPE_BIT,
 750                                    MASK_RFIC_SPCR_BITS | PCH_ALL);
 751
 752         /* Wait until the transfer completes; go to sleep after
 753                                  initiating the transfer. */
 754         dev_dbg(&data->master->dev,
 755                 "%s:waiting for transfer to get over\n", __func__);
 756
 757         wait_event_interruptible(data->wait, data->transfer_complete);
 758
 759         /* clear all interrupts */
 760         pch_spi_writereg(data->master, PCH_SPSR,
 761                          pch_spi_readreg(data->master, PCH_SPSR));
 762         /* Disable interrupts and SPI transfer */
 763         pch_spi_setclr_reg(data->master, PCH_SPCR, 0, PCH_ALL | SPCR_SPE_BIT);
 764         /* clear FIFO */
 765         pch_spi_clear_fifo(data->master);
 766 }
 767
 768 static void pch_spi_copy_rx_data(struct pch_spi_data *data, int bpw)
 769 {
 770         int j;
 771         u8 *rx_buf;
 772         u16 *rx_sbuf;
 773
 774         /* copy Rx Data */
 775         if (!data->cur_trans->rx_buf)
 776                 return;
 777
 778         if (bpw == 8) {
 779                 rx_buf = data->cur_trans->rx_buf;
 780                 for (j = 0; j < data->bpw_len; j++)
 781                         *rx_buf++ = data->pkt_rx_buff[j] & 0xFF;
 782         } else {
 783                 rx_sbuf = data->cur_trans->rx_buf;
 784                 for (j = 0; j < data->bpw_len; j++)
 785                         *rx_sbuf++ = data->pkt_rx_buff[j];
 786         }
 787 }
 788
 789 static void pch_spi_copy_rx_data_for_dma(struct pch_spi_data *data, int bpw)
 790 {
 791         int j;
 792         u8 *rx_buf;
 793         u16 *rx_sbuf;
 794         const u8 *rx_dma_buf;
 795         const u16 *rx_dma_sbuf;
 796
 797         /* copy Rx Data */
 798         if (!data->cur_trans->rx_buf)
 799                 return;
 800
 801         if (bpw == 8) {
 802                 rx_buf = data->cur_trans->rx_buf;
 803                 rx_dma_buf = data->dma.rx_buf_virt;
 804                 for (j = 0; j < data->bpw_len; j++)
 805                         *rx_buf++ = *rx_dma_buf++ & 0xFF;
 806                 data->cur_trans->rx_buf = rx_buf;
 807         } else {
 808                 rx_sbuf = data->cur_trans->rx_buf;
 809                 rx_dma_sbuf = data->dma.rx_buf_virt;
 810                 for (j = 0; j < data->bpw_len; j++)
 811                         *rx_sbuf++ = *rx_dma_sbuf++;
 812                 data->cur_trans->rx_buf = rx_sbuf;
 813         }
 814 }
 815
 816 static int pch_spi_start_transfer(struct pch_spi_data *data)
 817 {
 818         struct pch_spi_dma_ctrl *dma;
 819         unsigned long flags;
 820         int rtn;
 821
 822         dma = &data->dma;
 823
 824         spin_lock_irqsave(&data->lock, flags);
 825
 826         /* disable interrupts, SPI set enable */
 827         pch_spi_setclr_reg(data->master, PCH_SPCR, SPCR_SPE_BIT, PCH_ALL);
 828
 829         spin_unlock_irqrestore(&data->lock, flags);
 830
 831         /* Wait until the transfer completes; go to sleep after
 832                                  initiating the transfer. */
 833         dev_dbg(&data->master->dev,
 834                 "%s:waiting for transfer to get over\n", __func__);
 835         rtn = wait_event_interruptible_timeout(data->wait,
 836                                                data->transfer_complete,
 837                                                msecs_to_jiffies(2 * HZ));
 838         if (!rtn)
 839                 dev_err(&data->master->dev,
 840                         "%s wait-event timeout\n", __func__);
 841
 842         dma_sync_sg_for_cpu(&data->master->dev, dma->sg_rx_p, dma->nent,
 843                             DMA_FROM_DEVICE);
 844
 845         dma_sync_sg_for_cpu(&data->master->dev, dma->sg_tx_p, dma->nent,
 846                             DMA_FROM_DEVICE);
 847         memset(data->dma.tx_buf_virt, 0, PAGE_SIZE);
 848
 849         async_tx_ack(dma->desc_rx);
 850         async_tx_ack(dma->desc_tx);
 851         kfree(dma->sg_tx_p);
 852         kfree(dma->sg_rx_p);
 853
 854         spin_lock_irqsave(&data->lock, flags);
 855
 856         /* clear fifo threshold, disable interrupts, disable SPI transfer */
 857         pch_spi_setclr_reg(data->master, PCH_SPCR, 0,
 858                            MASK_RFIC_SPCR_BITS | MASK_TFIC_SPCR_BITS | PCH_ALL |
 859                            SPCR_SPE_BIT);
 860         /* clear all interrupts */
 861         pch_spi_writereg(data->master, PCH_SPSR,
 862                          pch_spi_readreg(data->master, PCH_SPSR));
 863         /* clear FIFO */
 864         pch_spi_clear_fifo(data->master);
 865
 866         spin_unlock_irqrestore(&data->lock, flags);
 867
 868         return rtn;
 869 }
 870
 871 static void pch_dma_rx_complete(void *arg)
 872 {
 873         struct pch_spi_data *data = arg;
 874
 875         /* transfer is completed;inform pch_spi_process_messages_dma */
 876         data->transfer_complete = true;
 877         wake_up_interruptible(&data->wait);
 878 }
 879
 880 static bool pch_spi_filter(struct dma_chan *chan, void *slave)
 881 {
 882         struct pch_dma_slave *param = slave;
 883
 884         if ((chan->chan_id == param->chan_id) &&
 885             (param->dma_dev == chan->device->dev)) {
 886                 chan->private = param;
 887                 return true;
 888         } else {
 889                 return false;
 890         }
 891 }
 892
 893 static void pch_spi_request_dma(struct pch_spi_data *data, int bpw)
 894 {
 895         dma_cap_mask_t mask;
 896         struct dma_chan *chan;
 897         struct pci_dev *dma_dev;
 898         struct pch_dma_slave *param;
 899         struct pch_spi_dma_ctrl *dma;
 900         unsigned int width;
 901
 902         if (bpw == 8)
 903                 width = PCH_DMA_WIDTH_1_BYTE;
 904         else
 905                 width = PCH_DMA_WIDTH_2_BYTES;
 906
 907         dma = &data->dma;
 908         dma_cap_zero(mask);
 909         dma_cap_set(DMA_SLAVE, mask);
 910
 911         /* Get DMA's dev information */
 912         dma_dev = pci_get_bus_and_slot(data->board_dat->pdev->bus->number,
 913                                        PCI_DEVFN(12, 0));
 914
 915         /* Set Tx DMA */
 916         param = &dma->param_tx;
 917         param->dma_dev = &dma_dev->dev;
 918         param->chan_id = data->ch * 2; /* Tx = 0, 2 */;
 919         param->tx_reg = data->io_base_addr + PCH_SPDWR;
 920         param->width = width;
 921         chan = dma_request_channel(mask, pch_spi_filter, param);
 922         if (!chan) {
 923                 dev_err(&data->master->dev,
 924                         "ERROR: dma_request_channel FAILS(Tx)\n");
 925                 data->use_dma = 0;
 926                 return;
 927         }
 928         dma->chan_tx = chan;
 929
 930         /* Set Rx DMA */
 931         param = &dma->param_rx;
 932         param->dma_dev = &dma_dev->dev;
 933         param->chan_id = data->ch * 2 + 1; /* Rx = Tx + 1 */;
 934         param->rx_reg = data->io_base_addr + PCH_SPDRR;
 935         param->width = width;
 936         chan = dma_request_channel(mask, pch_spi_filter, param);
 937         if (!chan) {
 938                 dev_err(&data->master->dev,
 939                         "ERROR: dma_request_channel FAILS(Rx)\n");
 940                 dma_release_channel(dma->chan_tx);
 941                 dma->chan_tx = NULL;
 942                 data->use_dma = 0;
 943                 return;
 944         }
 945         dma->chan_rx = chan;
 946 }
 947
 948 static void pch_spi_release_dma(struct pch_spi_data *data)
 949 {
 950         struct pch_spi_dma_ctrl *dma;
 951
 952         dma = &data->dma;
 953         if (dma->chan_tx) {
 954                 dma_release_channel(dma->chan_tx);
 955                 dma->chan_tx = NULL;
 956         }
 957         if (dma->chan_rx) {
 958                 dma_release_channel(dma->chan_rx);
 959                 dma->chan_rx = NULL;
 960         }
 961         return;
 962 }
 963
 964 static void pch_spi_handle_dma(struct pch_spi_data *data, int *bpw)
 965 {
 966         const u8 *tx_buf;
 967         const u16 *tx_sbuf;
 968         u8 *tx_dma_buf;
 969         u16 *tx_dma_sbuf;
 970         struct scatterlist *sg;
 971         struct dma_async_tx_descriptor *desc_tx;
 972         struct dma_async_tx_descriptor *desc_rx;
 973         int num;
 974         int i;
 975         int size;
 976         int rem;
 977         int head;
 978         unsigned long flags;
 979         struct pch_spi_dma_ctrl *dma;
 980
 981         dma = &data->dma;
 982
 983         /* set baud rate if needed */
 984         if (data->cur_trans->speed_hz) {
 985                 dev_dbg(&data->master->dev, "%s:setting baud rate\n", __func__);
 986                 spin_lock_irqsave(&data->lock, flags);
 987                 pch_spi_set_baud_rate(data->master, data->cur_trans->speed_hz);
 988                 spin_unlock_irqrestore(&data->lock, flags);
 989         }
 990
 991         /* set bits per word if needed */
 992         if (data->cur_trans->bits_per_word &&
 993             (data->current_msg->spi->bits_per_word !=
 994              data->cur_trans->bits_per_word)) {
 995                 dev_dbg(&data->master->dev, "%s:set bits per word\n", __func__);
 996                 spin_lock_irqsave(&data->lock, flags);
 997                 pch_spi_set_bits_per_word(data->master,
 998                                           data->cur_trans->bits_per_word);
 999                 spin_unlock_irqrestore(&data->lock, flags);
1000                 *bpw = data->cur_trans->bits_per_word;
1001         } else {
1002                 *bpw = data->current_msg->spi->bits_per_word;
1003         }
1004         data->bpw_len = data->cur_trans->len / (*bpw / 8);
1005
1006         if (data->bpw_len > PCH_BUF_SIZE) {
1007                 data->bpw_len = PCH_BUF_SIZE;
1008                 data->cur_trans->len -= PCH_BUF_SIZE;
1009         }
1010
1011         /* copy Tx Data */
1012         if (data->cur_trans->tx_buf != NULL) {
1013                 if (*bpw == 8) {
1014                         tx_buf = data->cur_trans->tx_buf;
1015                         tx_dma_buf = dma->tx_buf_virt;
1016                         for (i = 0; i < data->bpw_len; i++)
1017                                 *tx_dma_buf++ = *tx_buf++;
1018                 } else {
1019                         tx_sbuf = data->cur_trans->tx_buf;
1020                         tx_dma_sbuf = dma->tx_buf_virt;
1021                         for (i = 0; i < data->bpw_len; i++)
1022                                 *tx_dma_sbuf++ = *tx_sbuf++;
1023                 }
1024         }
1025
1026         /* Calculate Rx parameter for DMA transmitting */
1027         if (data->bpw_len > PCH_DMA_TRANS_SIZE) {
1028                 if (data->bpw_len % PCH_DMA_TRANS_SIZE) {
1029                         num = data->bpw_len / PCH_DMA_TRANS_SIZE + 1;
1030                         rem = data->bpw_len % PCH_DMA_TRANS_SIZE;
1031                 } else {
1032                         num = data->bpw_len / PCH_DMA_TRANS_SIZE;
1033                         rem = PCH_DMA_TRANS_SIZE;
1034                 }
1035                 size = PCH_DMA_TRANS_SIZE;
1036         } else {
1037                 num = 1;
1038                 size = data->bpw_len;
1039                 rem = data->bpw_len;
1040         }
1041         dev_dbg(&data->master->dev, "%s num=%d size=%d rem=%d\n",
1042                 __func__, num, size, rem);
1043         spin_lock_irqsave(&data->lock, flags);
1044
1045         /* set receive fifo threshold and transmit fifo threshold */
1046         pch_spi_setclr_reg(data->master, PCH_SPCR,
1047                            ((size - 1) << SPCR_RFIC_FIELD) |
1048                            (PCH_TX_THOLD << SPCR_TFIC_FIELD),
1049                            MASK_RFIC_SPCR_BITS | MASK_TFIC_SPCR_BITS);
1050
1051         spin_unlock_irqrestore(&data->lock, flags);
1052
1053         /* RX */
1054         dma->sg_rx_p = kzalloc(sizeof(struct scatterlist)*num, GFP_ATOMIC);
1055         sg_init_table(dma->sg_rx_p, num); /* Initialize SG table */
1056         /* offset, length setting */
1057         sg = dma->sg_rx_p;
1058         for (i = 0; i < num; i++, sg++) {
1059                 if (i == (num - 2)) {
1060                         sg->offset = size * i;
1061                         sg->offset = sg->offset * (*bpw / 8);
1062                         sg_set_page(sg, virt_to_page(dma->rx_buf_virt), rem,
1063                                     sg->offset);
1064                         sg_dma_len(sg) = rem;
1065                 } else if (i == (num - 1)) {
1066                         sg->offset = size * (i - 1) + rem;
1067                         sg->offset = sg->offset * (*bpw / 8);
1068                         sg_set_page(sg, virt_to_page(dma->rx_buf_virt), size,
1069                                     sg->offset);
1070                         sg_dma_len(sg) = size;
1071                 } else {
1072                         sg->offset = size * i;
1073                         sg->offset = sg->offset * (*bpw / 8);
1074                         sg_set_page(sg, virt_to_page(dma->rx_buf_virt), size,
1075                                     sg->offset);
1076                         sg_dma_len(sg) = size;
1077                 }
1078                 sg_dma_address(sg) = dma->rx_buf_dma + sg->offset;
1079         }
1080         sg = dma->sg_rx_p;
1081         desc_rx = dmaengine_prep_slave_sg(dma->chan_rx, sg,
1082                                         num, DMA_DEV_TO_MEM,
1083                                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1084         if (!desc_rx) {
1085                 dev_err(&data->master->dev, "%s:device_prep_slave_sg Failed\n",
1086                         __func__);
1087                 return;
1088         }
1089         dma_sync_sg_for_device(&data->master->dev, sg, num, DMA_FROM_DEVICE);
1090         desc_rx->callback = pch_dma_rx_complete;
1091         desc_rx->callback_param = data;
1092         dma->nent = num;
1093         dma->desc_rx = desc_rx;
1094
1095         /* Calculate Tx parameter for DMA transmitting */
1096         if (data->bpw_len > PCH_MAX_FIFO_DEPTH) {
1097                 head = PCH_MAX_FIFO_DEPTH - PCH_DMA_TRANS_SIZE;
1098                 if (data->bpw_len % PCH_DMA_TRANS_SIZE > 4) {
1099                         num = data->bpw_len / PCH_DMA_TRANS_SIZE + 1;
1100                         rem = data->bpw_len % PCH_DMA_TRANS_SIZE - head;
1101                 } else {
1102                         num = data->bpw_len / PCH_DMA_TRANS_SIZE;
1103                         rem = data->bpw_len % PCH_DMA_TRANS_SIZE +
1104                               PCH_DMA_TRANS_SIZE - head;
1105                 }
1106                 size = PCH_DMA_TRANS_SIZE;
1107         } else {
1108                 num = 1;
1109                 size = data->bpw_len;
1110                 rem = data->bpw_len;
1111                 head = 0;
1112         }
1113
1114         dma->sg_tx_p = kzalloc(sizeof(struct scatterlist)*num, GFP_ATOMIC);
1115         sg_init_table(dma->sg_tx_p, num); /* Initialize SG table */
1116         /* offset, length setting */
1117         sg = dma->sg_tx_p;
1118         for (i = 0; i < num; i++, sg++) {
1119                 if (i == 0) {
1120                         sg->offset = 0;
1121                         sg_set_page(sg, virt_to_page(dma->tx_buf_virt), size + head,
1122                                     sg->offset);
1123                         sg_dma_len(sg) = size + head;
1124                 } else if (i == (num - 1)) {
1125                         sg->offset = head + size * i;
1126                         sg->offset = sg->offset * (*bpw / 8);
1127                         sg_set_page(sg, virt_to_page(dma->tx_buf_virt), rem,
1128                                     sg->offset);
1129                         sg_dma_len(sg) = rem;
1130                 } else {
1131                         sg->offset = head + size * i;
1132                         sg->offset = sg->offset * (*bpw / 8);
1133                         sg_set_page(sg, virt_to_page(dma->tx_buf_virt), size,
1134                                     sg->offset);
1135                         sg_dma_len(sg) = size;
1136                 }
1137                 sg_dma_address(sg) = dma->tx_buf_dma + sg->offset;
1138         }
1139         sg = dma->sg_tx_p;
1140         desc_tx = dmaengine_prep_slave_sg(dma->chan_tx,
1141                                         sg, num, DMA_MEM_TO_DEV,
1142                                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1143         if (!desc_tx) {
1144                 dev_err(&data->master->dev, "%s:device_prep_slave_sg Failed\n",
1145                         __func__);
1146                 return;
1147         }
1148         dma_sync_sg_for_device(&data->master->dev, sg, num, DMA_TO_DEVICE);
1149         desc_tx->callback = NULL;
1150         desc_tx->callback_param = data;
1151         dma->nent = num;
1152         dma->desc_tx = desc_tx;
1153
1154         dev_dbg(&data->master->dev, "\n%s:Pulling down SSN low - writing "
1155                 "0x2 to SSNXCR\n", __func__);
1156
1157         spin_lock_irqsave(&data->lock, flags);
1158         pch_spi_writereg(data->master, PCH_SSNXCR, SSN_LOW);
1159         desc_rx->tx_submit(desc_rx);
1160         desc_tx->tx_submit(desc_tx);
1161         spin_unlock_irqrestore(&data->lock, flags);
1162
1163         /* reset transfer complete flag */
1164         data->transfer_complete = false;
1165 }
1166
1167 static void pch_spi_process_messages(struct work_struct *pwork)
1168 {
1169         struct spi_message *pmsg, *tmp;
1170         struct pch_spi_data *data;
1171         int bpw;
1172
1173         data = container_of(pwork, struct pch_spi_data, work);
1174         dev_dbg(&data->master->dev, "%s data initialized\n", __func__);
1175
1176         spin_lock(&data->lock);
1177         /* check if suspend has been initiated;if yes flush queue */
1178         if (data->board_dat->suspend_sts || (data->status == STATUS_EXITING)) {
1179                 dev_dbg(&data->master->dev,
1180                         "%s suspend/remove initiated, flushing queue\n", __func__);
1181                 list_for_each_entry_safe(pmsg, tmp, data->queue.next, queue) {
1182                         pmsg->status = -EIO;
1183
1184                         if (pmsg->complete) {
1185                                 spin_unlock(&data->lock);
1186                                 pmsg->complete(pmsg->context);
1187                                 spin_lock(&data->lock);
1188                         }
1189
1190                         /* delete from queue */
1191                         list_del_init(&pmsg->queue);
1192                 }
1193
1194                 spin_unlock(&data->lock);
1195                 return;
1196         }
1197
1198         data->bcurrent_msg_processing = true;
1199         dev_dbg(&data->master->dev,
1200                 "%s Set data->bcurrent_msg_processing= true\n", __func__);
1201
1202         /* Get the message from the queue and delete it from there. */
1203         data->current_msg = list_entry(data->queue.next, struct spi_message,
1204                                         queue);
1205
1206         list_del_init(&data->current_msg->queue);
1207
1208         data->current_msg->status = 0;
1209
1210         pch_spi_select_chip(data, data->current_msg->spi);
1211
1212         spin_unlock(&data->lock);
1213
1214         if (data->use_dma)
1215                 pch_spi_request_dma(data,
1216                                     data->current_msg->spi->bits_per_word);
1217         pch_spi_writereg(data->master, PCH_SSNXCR, SSN_NO_CONTROL);
1218         do {
1219                 int cnt;
1220                 /* If we are already processing a message get the next
1221                 transfer structure from the message otherwise retrieve
1222                 the 1st transfer request from the message. */
1223                 spin_lock(&data->lock);
1224                 if (data->cur_trans == NULL) {
1225                         data->cur_trans =
1226                                 list_entry(data->current_msg->transfers.next,
1227                                            struct spi_transfer, transfer_list);
1228                         dev_dbg(&data->master->dev, "%s "
1229                                 ":Getting 1st transfer message\n", __func__);
1230                 } else {
1231                         data->cur_trans =
1232                                 list_entry(data->cur_trans->transfer_list.next,
1233                                            struct spi_transfer, transfer_list);
1234                         dev_dbg(&data->master->dev, "%s "
1235                                 ":Getting next transfer message\n", __func__);
1236                 }
1237                 spin_unlock(&data->lock);
1238
1239                 if (!data->cur_trans->len)
1240                         goto out;
1241                 cnt = (data->cur_trans->len - 1) / PCH_BUF_SIZE + 1;
1242                 data->save_total_len = data->cur_trans->len;
1243                 if (data->use_dma) {
1244                         int i;
1245                         char *save_rx_buf = data->cur_trans->rx_buf;
1246                         for (i = 0; i < cnt; i ++) {
1247                                 pch_spi_handle_dma(data, &bpw);
1248                                 if (!pch_spi_start_transfer(data)) {
1249                                         data->transfer_complete = true;
1250                                         data->current_msg->status = -EIO;
1251                                         data->current_msg->complete
1252                                                    (data->current_msg->context);
1253                                         data->bcurrent_msg_processing = false;
1254                                         data->current_msg = NULL;
1255                                         data->cur_trans = NULL;
1256                                         goto out;
1257                                 }
1258                                 pch_spi_copy_rx_data_for_dma(data, bpw);
1259                         }
1260                         data->cur_trans->rx_buf = save_rx_buf;
1261                 } else {
1262                         pch_spi_set_tx(data, &bpw);
1263                         pch_spi_set_ir(data);
1264                         pch_spi_copy_rx_data(data, bpw);
1265                         kfree(data->pkt_rx_buff);
1266                         data->pkt_rx_buff = NULL;
1267                         kfree(data->pkt_tx_buff);
1268                         data->pkt_tx_buff = NULL;
1269                 }
1270                 /* increment message count */
1271                 data->cur_trans->len = data->save_total_len;
1272                 data->current_msg->actual_length += data->cur_trans->len;
1273
1274                 dev_dbg(&data->master->dev,
1275                         "%s:data->current_msg->actual_length=%d\n",
1276                         __func__, data->current_msg->actual_length);
1277
1278                 /* check for delay */
1279                 if (data->cur_trans->delay_usecs) {
1280                         dev_dbg(&data->master->dev, "%s:"
1281                                 "delay in usec=%d\n", __func__,
1282                                 data->cur_trans->delay_usecs);
1283                         udelay(data->cur_trans->delay_usecs);
1284                 }
1285
1286                 spin_lock(&data->lock);
1287
1288                 /* No more transfer in this message. */
1289                 if ((data->cur_trans->transfer_list.next) ==
1290                     &(data->current_msg->transfers)) {
1291                         pch_spi_nomore_transfer(data);
1292                 }
1293
1294                 spin_unlock(&data->lock);
1295
1296         } while (data->cur_trans != NULL);
1297
1298 out:
1299         pch_spi_writereg(data->master, PCH_SSNXCR, SSN_HIGH);
1300         if (data->use_dma)
1301                 pch_spi_release_dma(data);
1302 }
1303
1304 static void pch_spi_free_resources(struct pch_spi_board_data *board_dat,
1305                                    struct pch_spi_data *data)
1306 {
1307         dev_dbg(&board_dat->pdev->dev, "%s ENTRY\n", __func__);
1308
1309         /* free workqueue */
1310         if (data->wk != NULL) {
1311                 destroy_workqueue(data->wk);
1312                 data->wk = NULL;
1313                 dev_dbg(&board_dat->pdev->dev,
1314                         "%s destroy_workqueue invoked successfully\n",
1315                         __func__);
1316         }
1317 }
1318
1319 static int pch_spi_get_resources(struct pch_spi_board_data *board_dat,
1320                                  struct pch_spi_data *data)
1321 {
1322         int retval = 0;
1323
1324         dev_dbg(&board_dat->pdev->dev, "%s ENTRY\n", __func__);
1325
1326         /* create workqueue */
1327         data->wk = create_singlethread_workqueue(KBUILD_MODNAME);
1328         if (!data->wk) {
1329                 dev_err(&board_dat->pdev->dev,
1330                         "%s create_singlet hread_workqueue failed\n", __func__);
1331                 retval = -EBUSY;
1332                 goto err_return;
1333         }
1334
1335         /* reset PCH SPI h/w */
1336         pch_spi_reset(data->master);
1337         dev_dbg(&board_dat->pdev->dev,
1338                 "%s pch_spi_reset invoked successfully\n", __func__);
1339
1340         dev_dbg(&board_dat->pdev->dev, "%s data->irq_reg_sts=true\n", __func__);
1341
1342 err_return:
1343         if (retval != 0) {
1344                 dev_err(&board_dat->pdev->dev,
1345                         "%s FAIL:invoking pch_spi_free_resources\n", __func__);
1346                 pch_spi_free_resources(board_dat, data);
1347         }
1348
1349         dev_dbg(&board_dat->pdev->dev, "%s Return=%d\n", __func__, retval);
1350
1351         return retval;
1352 }
1353
1354 static void pch_free_dma_buf(struct pch_spi_board_data *board_dat,
1355                              struct pch_spi_data *data)
1356 {
1357         struct pch_spi_dma_ctrl *dma;
1358
1359         dma = &data->dma;
1360         if (dma->tx_buf_dma)
1361                 dma_free_coherent(&board_dat->pdev->dev, PCH_BUF_SIZE,
1362                                   dma->tx_buf_virt, dma->tx_buf_dma);
1363         if (dma->rx_buf_dma)
1364                 dma_free_coherent(&board_dat->pdev->dev, PCH_BUF_SIZE,
1365                                   dma->rx_buf_virt, dma->rx_buf_dma);
1366         return;
1367 }
1368
1369 static void pch_alloc_dma_buf(struct pch_spi_board_data *board_dat,
1370                               struct pch_spi_data *data)
1371 {
1372         struct pch_spi_dma_ctrl *dma;
1373
1374         dma = &data->dma;
1375         /* Get Consistent memory for Tx DMA */
1376         dma->tx_buf_virt = dma_alloc_coherent(&board_dat->pdev->dev,
1377                                 PCH_BUF_SIZE, &dma->tx_buf_dma, GFP_KERNEL);
1378         /* Get Consistent memory for Rx DMA */
1379         dma->rx_buf_virt = dma_alloc_coherent(&board_dat->pdev->dev,
1380                                 PCH_BUF_SIZE, &dma->rx_buf_dma, GFP_KERNEL);
1381 }
1382
1383 static int pch_spi_pd_probe(struct platform_device *plat_dev)
1384 {
1385         int ret;
1386         struct spi_master *master;
1387         struct pch_spi_board_data *board_dat = dev_get_platdata(&plat_dev->dev);
1388         struct pch_spi_data *data;
1389
1390         dev_dbg(&plat_dev->dev, "%s:debug\n", __func__);
1391
1392         master = spi_alloc_master(&board_dat->pdev->dev,
1393                                   sizeof(struct pch_spi_data));
1394         if (!master) {
1395                 dev_err(&plat_dev->dev, "spi_alloc_master[%d] failed.\n",
1396                         plat_dev->id);
1397                 return -ENOMEM;
1398         }
1399
1400         data = spi_master_get_devdata(master);
1401         data->master = master;
1402
1403         platform_set_drvdata(plat_dev, data);
1404
1405         /* baseaddress + address offset) */
1406         data->io_base_addr = pci_resource_start(board_dat->pdev, 1) +
1407                                          PCH_ADDRESS_SIZE * plat_dev->id;
1408         data->io_remap_addr = pci_iomap(board_dat->pdev, 1, 0);
1409         if (!data->io_remap_addr) {
1410                 dev_err(&plat_dev->dev, "%s pci_iomap failed\n", __func__);
1411                 ret = -ENOMEM;
1412                 goto err_pci_iomap;
1413         }
1414         data->io_remap_addr += PCH_ADDRESS_SIZE * plat_dev->id;
1415
1416         dev_dbg(&plat_dev->dev, "[ch%d] remap_addr=%p\n",
1417                 plat_dev->id, data->io_remap_addr);
1418
1419         /* initialize members of SPI master */
1420         master->num_chipselect = PCH_MAX_CS;
1421         master->setup = pch_spi_setup;
1422         master->transfer = pch_spi_transfer;
1423         master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST;
1424         master->bits_per_word_mask = SPI_BPW_MASK(8) | SPI_BPW_MASK(16);
1425
1426         data->board_dat = board_dat;
1427         data->plat_dev = plat_dev;
1428         data->n_curnt_chip = 255;
1429         data->status = STATUS_RUNNING;
1430         data->ch = plat_dev->id;
1431         data->use_dma = use_dma;
1432
1433         INIT_LIST_HEAD(&data->queue);
1434         spin_lock_init(&data->lock);
1435         INIT_WORK(&data->work, pch_spi_process_messages);
1436         init_waitqueue_head(&data->wait);
1437
1438         ret = pch_spi_get_resources(board_dat, data);
1439         if (ret) {
1440                 dev_err(&plat_dev->dev, "%s fail(retval=%d)\n", __func__, ret);
1441                 goto err_spi_get_resources;
1442         }
1443
1444         ret = request_irq(board_dat->pdev->irq, pch_spi_handler,
1445                           IRQF_SHARED, KBUILD_MODNAME, data);
1446         if (ret) {
1447                 dev_err(&plat_dev->dev,
1448                         "%s request_irq failed\n", __func__);
1449                 goto err_request_irq;
1450         }
1451         data->irq_reg_sts = true;
1452
1453         pch_spi_set_master_mode(master);
1454
1455         if (use_dma) {
1456                 dev_info(&plat_dev->dev, "Use DMA for data transfers\n");
1457                 pch_alloc_dma_buf(board_dat, data);
1458         }
1459
1460         ret = spi_register_master(master);
1461         if (ret != 0) {
1462                 dev_err(&plat_dev->dev,
1463                         "%s spi_register_master FAILED\n", __func__);
1464                 goto err_spi_register_master;
1465         }
1466
1467         return 0;
1468
1469 err_spi_register_master:
1470         pch_free_dma_buf(board_dat, data);
1471         free_irq(board_dat->pdev->irq, data);
1472 err_request_irq:
1473         pch_spi_free_resources(board_dat, data);
1474 err_spi_get_resources:
1475         pci_iounmap(board_dat->pdev, data->io_remap_addr);
1476 err_pci_iomap:
1477         spi_master_put(master);
1478
1479         return ret;
1480 }
1481
1482 static int pch_spi_pd_remove(struct platform_device *plat_dev)
1483 {
1484         struct pch_spi_board_data *board_dat = dev_get_platdata(&plat_dev->dev);
1485         struct pch_spi_data *data = platform_get_drvdata(plat_dev);
1486         int count;
1487         unsigned long flags;
1488
1489         dev_dbg(&plat_dev->dev, "%s:[ch%d] irq=%d\n",
1490                 __func__, plat_dev->id, board_dat->pdev->irq);
1491
1492         if (use_dma)
1493                 pch_free_dma_buf(board_dat, data);
1494
1495         /* check for any pending messages; no action is taken if the queue
1496          * is still full; but at least we tried.  Unload anyway */
1497         count = 500;
1498         spin_lock_irqsave(&data->lock, flags);
1499         data->status = STATUS_EXITING;
1500         while ((list_empty(&data->queue) == 0) && --count) {
1501                 dev_dbg(&board_dat->pdev->dev, "%s :queue not empty\n",
1502                         __func__);
1503                 spin_unlock_irqrestore(&data->lock, flags);
1504                 msleep(PCH_SLEEP_TIME);
1505                 spin_lock_irqsave(&data->lock, flags);
1506         }
1507         spin_unlock_irqrestore(&data->lock, flags);
1508
1509         pch_spi_free_resources(board_dat, data);
1510         /* disable interrupts & free IRQ */
1511         if (data->irq_reg_sts) {
1512                 /* disable interrupts */
1513                 pch_spi_setclr_reg(data->master, PCH_SPCR, 0, PCH_ALL);
1514                 data->irq_reg_sts = false;
1515                 free_irq(board_dat->pdev->irq, data);
1516         }
1517
1518         pci_iounmap(board_dat->pdev, data->io_remap_addr);
1519         spi_unregister_master(data->master);
1520
1521         return 0;
1522 }
1523 #ifdef CONFIG_PM
1524 static int pch_spi_pd_suspend(struct platform_device *pd_dev,
1525                               pm_message_t state)
1526 {
1527         u8 count;
1528         struct pch_spi_board_data *board_dat = dev_get_platdata(&pd_dev->dev);
1529         struct pch_spi_data *data = platform_get_drvdata(pd_dev);
1530
1531         dev_dbg(&pd_dev->dev, "%s ENTRY\n", __func__);
1532
1533         if (!board_dat) {
1534                 dev_err(&pd_dev->dev,
1535                         "%s pci_get_drvdata returned NULL\n", __func__);
1536                 return -EFAULT;
1537         }
1538
1539         /* check if the current message is processed:
1540            Only after thats done the transfer will be suspended */
1541         count = 255;
1542         while ((--count) > 0) {
1543                 if (!(data->bcurrent_msg_processing))
1544                         break;
1545                 msleep(PCH_SLEEP_TIME);
1546         }
1547
1548         /* Free IRQ */
1549         if (data->irq_reg_sts) {
1550                 /* disable all interrupts */
1551                 pch_spi_setclr_reg(data->master, PCH_SPCR, 0, PCH_ALL);
1552                 pch_spi_reset(data->master);
1553                 free_irq(board_dat->pdev->irq, data);
1554
1555                 data->irq_reg_sts = false;
1556                 dev_dbg(&pd_dev->dev,
1557                         "%s free_irq invoked successfully.\n", __func__);
1558         }
1559
1560         return 0;
1561 }
1562
1563 static int pch_spi_pd_resume(struct platform_device *pd_dev)
1564 {
1565         struct pch_spi_board_data *board_dat = dev_get_platdata(&pd_dev->dev);
1566         struct pch_spi_data *data = platform_get_drvdata(pd_dev);
1567         int retval;
1568
1569         if (!board_dat) {
1570                 dev_err(&pd_dev->dev,
1571                         "%s pci_get_drvdata returned NULL\n", __func__);
1572                 return -EFAULT;
1573         }
1574
1575         if (!data->irq_reg_sts) {
1576                 /* register IRQ */
1577                 retval = request_irq(board_dat->pdev->irq, pch_spi_handler,
1578                                      IRQF_SHARED, KBUILD_MODNAME, data);
1579                 if (retval < 0) {
1580                         dev_err(&pd_dev->dev,
1581                                 "%s request_irq failed\n", __func__);
1582                         return retval;
1583                 }
1584
1585                 /* reset PCH SPI h/w */
1586                 pch_spi_reset(data->master);
1587                 pch_spi_set_master_mode(data->master);
1588                 data->irq_reg_sts = true;
1589         }
1590         return 0;
1591 }
1592 #else
1593 #define pch_spi_pd_suspend NULL
1594 #define pch_spi_pd_resume NULL
1595 #endif
1596
1597 static struct platform_driver pch_spi_pd_driver = {
1598         .driver = {
1599                 .name = "pch-spi",
1600                 .owner = THIS_MODULE,
1601         },
1602         .probe = pch_spi_pd_probe,
1603         .remove = pch_spi_pd_remove,
1604         .suspend = pch_spi_pd_suspend,
1605         .resume = pch_spi_pd_resume
1606 };
1607
1608 static int pch_spi_probe(struct pci_dev *pdev,
1609                                    const struct pci_device_id *id)
1610 {
1611         struct pch_spi_board_data *board_dat;
1612         struct platform_device *pd_dev = NULL;
1613         int retval;
1614         int i;
1615         struct pch_pd_dev_save *pd_dev_save;
1616
1617         pd_dev_save = kzalloc(sizeof(struct pch_pd_dev_save), GFP_KERNEL);
1618         if (!pd_dev_save) {
1619                 dev_err(&pdev->dev, "%s Can't allocate pd_dev_sav\n", __func__);
1620                 return -ENOMEM;
1621         }
1622
1623         board_dat = kzalloc(sizeof(struct pch_spi_board_data), GFP_KERNEL);
1624         if (!board_dat) {
1625                 dev_err(&pdev->dev, "%s Can't allocate board_dat\n", __func__);
1626                 retval = -ENOMEM;
1627                 goto err_no_mem;
1628         }
1629
1630         retval = pci_request_regions(pdev, KBUILD_MODNAME);
1631         if (retval) {
1632                 dev_err(&pdev->dev, "%s request_region failed\n", __func__);
1633                 goto pci_request_regions;
1634         }
1635
1636         board_dat->pdev = pdev;
1637         board_dat->num = id->driver_data;
1638         pd_dev_save->num = id->driver_data;
1639         pd_dev_save->board_dat = board_dat;
1640
1641         retval = pci_enable_device(pdev);
1642         if (retval) {
1643                 dev_err(&pdev->dev, "%s pci_enable_device failed\n", __func__);
1644                 goto pci_enable_device;
1645         }
1646
1647         for (i = 0; i < board_dat->num; i++) {
1648                 pd_dev = platform_device_alloc("pch-spi", i);
1649                 if (!pd_dev) {
1650                         dev_err(&pdev->dev, "platform_device_alloc failed\n");
1651                         retval = -ENOMEM;
1652                         goto err_platform_device;
1653                 }
1654                 pd_dev_save->pd_save[i] = pd_dev;
1655                 pd_dev->dev.parent = &pdev->dev;
1656
1657                 retval = platform_device_add_data(pd_dev, board_dat,
1658                                                   sizeof(*board_dat));
1659                 if (retval) {
1660                         dev_err(&pdev->dev,
1661                                 "platform_device_add_data failed\n");
1662                         platform_device_put(pd_dev);
1663                         goto err_platform_device;
1664                 }
1665
1666                 retval = platform_device_add(pd_dev);
1667                 if (retval) {
1668                         dev_err(&pdev->dev, "platform_device_add failed\n");
1669                         platform_device_put(pd_dev);
1670                         goto err_platform_device;
1671                 }
1672         }
1673
1674         pci_set_drvdata(pdev, pd_dev_save);
1675
1676         return 0;
1677
1678 err_platform_device:
1679         pci_disable_device(pdev);
1680 pci_enable_device:
1681         pci_release_regions(pdev);
1682 pci_request_regions:
1683         kfree(board_dat);
1684 err_no_mem:
1685         kfree(pd_dev_save);
1686
1687         return retval;
1688 }
1689
1690 static void pch_spi_remove(struct pci_dev *pdev)
1691 {
1692         int i;
1693         struct pch_pd_dev_save *pd_dev_save = pci_get_drvdata(pdev);
1694
1695         dev_dbg(&pdev->dev, "%s ENTRY:pdev=%p\n", __func__, pdev);
1696
1697         for (i = 0; i < pd_dev_save->num; i++)
1698                 platform_device_unregister(pd_dev_save->pd_save[i]);
1699
1700         pci_disable_device(pdev);
1701         pci_release_regions(pdev);
1702         kfree(pd_dev_save->board_dat);
1703         kfree(pd_dev_save);
1704 }
1705
1706 #ifdef CONFIG_PM
1707 static int pch_spi_suspend(struct pci_dev *pdev, pm_message_t state)
1708 {
1709         int retval;
1710         struct pch_pd_dev_save *pd_dev_save = pci_get_drvdata(pdev);
1711
1712         dev_dbg(&pdev->dev, "%s ENTRY\n", __func__);
1713
1714         pd_dev_save->board_dat->suspend_sts = true;
1715
1716         /* save config space */
1717         retval = pci_save_state(pdev);
1718         if (retval == 0) {
1719                 pci_enable_wake(pdev, PCI_D3hot, 0);
1720                 pci_disable_device(pdev);
1721                 pci_set_power_state(pdev, PCI_D3hot);
1722         } else {
1723                 dev_err(&pdev->dev, "%s pci_save_state failed\n", __func__);
1724         }
1725
1726         return retval;
1727 }
1728
1729 static int pch_spi_resume(struct pci_dev *pdev)
1730 {
1731         int retval;
1732         struct pch_pd_dev_save *pd_dev_save = pci_get_drvdata(pdev);
1733         dev_dbg(&pdev->dev, "%s ENTRY\n", __func__);
1734
1735         pci_set_power_state(pdev, PCI_D0);
1736         pci_restore_state(pdev);
1737
1738         retval = pci_enable_device(pdev);
1739         if (retval < 0) {
1740                 dev_err(&pdev->dev,
1741                         "%s pci_enable_device failed\n", __func__);
1742         } else {
1743                 pci_enable_wake(pdev, PCI_D3hot, 0);
1744
1745                 /* set suspend status to false */
1746                 pd_dev_save->board_dat->suspend_sts = false;
1747         }
1748
1749         return retval;
1750 }
1751 #else
1752 #define pch_spi_suspend NULL
1753 #define pch_spi_resume NULL
1754
1755 #endif
1756
1757 static struct pci_driver pch_spi_pcidev_driver = {
1758         .name = "pch_spi",
1759         .id_table = pch_spi_pcidev_id,
1760         .probe = pch_spi_probe,
1761         .remove = pch_spi_remove,
1762         .suspend = pch_spi_suspend,
1763         .resume = pch_spi_resume,
1764 };
1765
1766 static int __init pch_spi_init(void)
1767 {
1768         int ret;
1769         ret = platform_driver_register(&pch_spi_pd_driver);
1770         if (ret)
1771                 return ret;
1772
1773         ret = pci_register_driver(&pch_spi_pcidev_driver);
1774         if (ret) {
1775                 platform_driver_unregister(&pch_spi_pd_driver);
1776                 return ret;
1777         }
1778
1779         return 0;
1780 }
1781 module_init(pch_spi_init);
1782
1783 static void __exit pch_spi_exit(void)
1784 {
1785         pci_unregister_driver(&pch_spi_pcidev_driver);
1786         platform_driver_unregister(&pch_spi_pd_driver);
1787 }
1788 module_exit(pch_spi_exit);
1789
1790 module_param(use_dma, int, 0644);
1791 MODULE_PARM_DESC(use_dma,
1792                  "to use DMA for data transfers pass 1 else 0; default 1");
1793
1794 MODULE_LICENSE("GPL");
1795 MODULE_DESCRIPTION("Intel EG20T PCH/LAPIS Semiconductor ML7xxx IOH SPI Driver");
1796 MODULE_DEVICE_TABLE(pci, pch_spi_pcidev_id);
1797