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 DEFINE_PCI_DEVICE_TABLE(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 != 0) {
 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 bits per word */
 470         if (pspi->bits_per_word == 0) {
 471                 pspi->bits_per_word = 8;
 472                 dev_dbg(&pspi->dev, "%s 8 bits per word\n", __func__);
 473         }
 474
 475         if ((pspi->bits_per_word != 8) && (pspi->bits_per_word != 16)) {
 476                 dev_err(&pspi->dev, "%s Invalid bits per word\n", __func__);
 477                 return -EINVAL;
 478         }
 479
 480         /* Check baud rate setting */
 481         /* if baud rate of chip is greater than
 482            max we can support,return error */
 483         if ((pspi->max_speed_hz) > PCH_MAX_BAUDRATE)
 484                 pspi->max_speed_hz = PCH_MAX_BAUDRATE;
 485
 486         dev_dbg(&pspi->dev, "%s MODE = %x\n", __func__,
 487                 (pspi->mode) & (SPI_CPOL | SPI_CPHA));
 488
 489         return 0;
 490 }
 491
 492 static int pch_spi_transfer(struct spi_device *pspi, struct spi_message *pmsg)
 493 {
 494
 495         struct spi_transfer *transfer;
 496         struct pch_spi_data *data = spi_master_get_devdata(pspi->master);
 497         int retval;
 498         unsigned long flags;
 499
 500         /* validate spi message and baud rate */
 501         if (unlikely(list_empty(&pmsg->transfers) == 1)) {
 502                 dev_err(&pspi->dev, "%s list empty\n", __func__);
 503                 retval = -EINVAL;
 504                 goto err_out;
 505         }
 506
 507         if (unlikely(pspi->max_speed_hz == 0)) {
 508                 dev_err(&pspi->dev, "%s pch_spi_tranfer maxspeed=%d\n",
 509                         __func__, pspi->max_speed_hz);
 510                 retval = -EINVAL;
 511                 goto err_out;
 512         }
 513
 514         dev_dbg(&pspi->dev, "%s Transfer List not empty. "
 515                 "Transfer Speed is set.\n", __func__);
 516
 517         spin_lock_irqsave(&data->lock, flags);
 518         /* validate Tx/Rx buffers and Transfer length */
 519         list_for_each_entry(transfer, &pmsg->transfers, transfer_list) {
 520                 if (!transfer->tx_buf && !transfer->rx_buf) {
 521                         dev_err(&pspi->dev,
 522                                 "%s Tx and Rx buffer NULL\n", __func__);
 523                         retval = -EINVAL;
 524                         goto err_return_spinlock;
 525                 }
 526
 527                 if (!transfer->len) {
 528                         dev_err(&pspi->dev, "%s Transfer length invalid\n",
 529                                 __func__);
 530                         retval = -EINVAL;
 531                         goto err_return_spinlock;
 532                 }
 533
 534                 dev_dbg(&pspi->dev, "%s Tx/Rx buffer valid. Transfer length"
 535                         " valid\n", __func__);
 536
 537                 /* if baud rate has been specified validate the same */
 538                 if (transfer->speed_hz > PCH_MAX_BAUDRATE)
 539                         transfer->speed_hz = PCH_MAX_BAUDRATE;
 540
 541                 /* if bits per word has been specified validate the same */
 542                 if (transfer->bits_per_word) {
 543                         if ((transfer->bits_per_word != 8)
 544                             && (transfer->bits_per_word != 16)) {
 545                                 retval = -EINVAL;
 546                                 dev_err(&pspi->dev,
 547                                         "%s Invalid bits per word\n", __func__);
 548                                 goto err_return_spinlock;
 549                         }
 550                 }
 551         }
 552         spin_unlock_irqrestore(&data->lock, flags);
 553
 554         /* We won't process any messages if we have been asked to terminate */
 555         if (data->status == STATUS_EXITING) {
 556                 dev_err(&pspi->dev, "%s status = STATUS_EXITING.\n", __func__);
 557                 retval = -ESHUTDOWN;
 558                 goto err_out;
 559         }
 560
 561         /* If suspended ,return -EINVAL */
 562         if (data->board_dat->suspend_sts) {
 563                 dev_err(&pspi->dev, "%s suspend; returning EINVAL\n", __func__);
 564                 retval = -EINVAL;
 565                 goto err_out;
 566         }
 567
 568         /* set status of message */
 569         pmsg->actual_length = 0;
 570         dev_dbg(&pspi->dev, "%s - pmsg->status =%d\n", __func__, pmsg->status);
 571
 572         pmsg->status = -EINPROGRESS;
 573         spin_lock_irqsave(&data->lock, flags);
 574         /* add message to queue */
 575         list_add_tail(&pmsg->queue, &data->queue);
 576         spin_unlock_irqrestore(&data->lock, flags);
 577
 578         dev_dbg(&pspi->dev, "%s - Invoked list_add_tail\n", __func__);
 579
 580         /* schedule work queue to run */
 581         queue_work(data->wk, &data->work);
 582         dev_dbg(&pspi->dev, "%s - Invoked queue work\n", __func__);
 583
 584         retval = 0;
 585
 586 err_out:
 587         dev_dbg(&pspi->dev, "%s RETURN=%d\n", __func__, retval);
 588         return retval;
 589 err_return_spinlock:
 590         dev_dbg(&pspi->dev, "%s RETURN=%d\n", __func__, retval);
 591         spin_unlock_irqrestore(&data->lock, flags);
 592         return retval;
 593 }
 594
 595 static inline void pch_spi_select_chip(struct pch_spi_data *data,
 596                                        struct spi_device *pspi)
 597 {
 598         if (data->current_chip != NULL) {
 599                 if (pspi->chip_select != data->n_curnt_chip) {
 600                         dev_dbg(&pspi->dev, "%s : different slave\n", __func__);
 601                         data->current_chip = NULL;
 602                 }
 603         }
 604
 605         data->current_chip = pspi;
 606
 607         data->n_curnt_chip = data->current_chip->chip_select;
 608
 609         dev_dbg(&pspi->dev, "%s :Invoking pch_spi_setup_transfer\n", __func__);
 610         pch_spi_setup_transfer(pspi);
 611 }
 612
 613 static void pch_spi_set_tx(struct pch_spi_data *data, int *bpw)
 614 {
 615         int size;
 616         u32 n_writes;
 617         int j;
 618         struct spi_message *pmsg;
 619         const u8 *tx_buf;
 620         const u16 *tx_sbuf;
 621
 622         /* set baud rate if needed */
 623         if (data->cur_trans->speed_hz) {
 624                 dev_dbg(&data->master->dev, "%s:setting baud rate\n", __func__);
 625                 pch_spi_set_baud_rate(data->master, data->cur_trans->speed_hz);
 626         }
 627
 628         /* set bits per word if needed */
 629         if (data->cur_trans->bits_per_word &&
 630             (data->current_msg->spi->bits_per_word != data->cur_trans->bits_per_word)) {
 631                 dev_dbg(&data->master->dev, "%s:set bits per word\n", __func__);
 632                 pch_spi_set_bits_per_word(data->master,
 633                                           data->cur_trans->bits_per_word);
 634                 *bpw = data->cur_trans->bits_per_word;
 635         } else {
 636                 *bpw = data->current_msg->spi->bits_per_word;
 637         }
 638
 639         /* reset Tx/Rx index */
 640         data->tx_index = 0;
 641         data->rx_index = 0;
 642
 643         data->bpw_len = data->cur_trans->len / (*bpw / 8);
 644
 645         /* find alloc size */
 646         size = data->cur_trans->len * sizeof(*data->pkt_tx_buff);
 647
 648         /* allocate memory for pkt_tx_buff & pkt_rx_buffer */
 649         data->pkt_tx_buff = kzalloc(size, GFP_KERNEL);
 650         if (data->pkt_tx_buff != NULL) {
 651                 data->pkt_rx_buff = kzalloc(size, GFP_KERNEL);
 652                 if (!data->pkt_rx_buff)
 653                         kfree(data->pkt_tx_buff);
 654         }
 655
 656         if (!data->pkt_rx_buff) {
 657                 /* flush queue and set status of all transfers to -ENOMEM */
 658                 dev_err(&data->master->dev, "%s :kzalloc failed\n", __func__);
 659                 list_for_each_entry(pmsg, data->queue.next, queue) {
 660                         pmsg->status = -ENOMEM;
 661
 662                         if (pmsg->complete != 0)
 663                                 pmsg->complete(pmsg->context);
 664
 665                         /* delete from queue */
 666                         list_del_init(&pmsg->queue);
 667                 }
 668                 return;
 669         }
 670
 671         /* copy Tx Data */
 672         if (data->cur_trans->tx_buf != NULL) {
 673                 if (*bpw == 8) {
 674                         tx_buf = data->cur_trans->tx_buf;
 675                         for (j = 0; j < data->bpw_len; j++)
 676                                 data->pkt_tx_buff[j] = *tx_buf++;
 677                 } else {
 678                         tx_sbuf = data->cur_trans->tx_buf;
 679                         for (j = 0; j < data->bpw_len; j++)
 680                                 data->pkt_tx_buff[j] = *tx_sbuf++;
 681                 }
 682         }
 683
 684         /* if len greater than PCH_MAX_FIFO_DEPTH, write 16,else len bytes */
 685         n_writes = data->bpw_len;
 686         if (n_writes > PCH_MAX_FIFO_DEPTH)
 687                 n_writes = PCH_MAX_FIFO_DEPTH;
 688
 689         dev_dbg(&data->master->dev, "\n%s:Pulling down SSN low - writing "
 690                 "0x2 to SSNXCR\n", __func__);
 691         pch_spi_writereg(data->master, PCH_SSNXCR, SSN_LOW);
 692
 693         for (j = 0; j < n_writes; j++)
 694                 pch_spi_writereg(data->master, PCH_SPDWR, data->pkt_tx_buff[j]);
 695
 696         /* update tx_index */
 697         data->tx_index = j;
 698
 699         /* reset transfer complete flag */
 700         data->transfer_complete = false;
 701         data->transfer_active = true;
 702 }
 703
 704 static void pch_spi_nomore_transfer(struct pch_spi_data *data)
 705 {
 706         struct spi_message *pmsg;
 707         dev_dbg(&data->master->dev, "%s called\n", __func__);
 708         /* Invoke complete callback
 709          * [To the spi core..indicating end of transfer] */
 710         data->current_msg->status = 0;
 711
 712         if (data->current_msg->complete != 0) {
 713                 dev_dbg(&data->master->dev,
 714                         "%s:Invoking callback of SPI core\n", __func__);
 715                 data->current_msg->complete(data->current_msg->context);
 716         }
 717
 718         /* update status in global variable */
 719         data->bcurrent_msg_processing = false;
 720
 721         dev_dbg(&data->master->dev,
 722                 "%s:data->bcurrent_msg_processing = false\n", __func__);
 723
 724         data->current_msg = NULL;
 725         data->cur_trans = NULL;
 726
 727         /* check if we have items in list and not suspending
 728          * return 1 if list empty */
 729         if ((list_empty(&data->queue) == 0) &&
 730             (!data->board_dat->suspend_sts) &&
 731             (data->status != STATUS_EXITING)) {
 732                 /* We have some more work to do (either there is more tranint
 733                  * bpw;sfer requests in the current message or there are
 734                  *more messages)
 735                  */
 736                 dev_dbg(&data->master->dev, "%s:Invoke queue_work\n", __func__);
 737                 queue_work(data->wk, &data->work);
 738         } else if (data->board_dat->suspend_sts ||
 739                    data->status == STATUS_EXITING) {
 740                 dev_dbg(&data->master->dev,
 741                         "%s suspend/remove initiated, flushing queue\n",
 742                         __func__);
 743                 list_for_each_entry(pmsg, data->queue.next, queue) {
 744                         pmsg->status = -EIO;
 745
 746                         if (pmsg->complete)
 747                                 pmsg->complete(pmsg->context);
 748
 749                         /* delete from queue */
 750                         list_del_init(&pmsg->queue);
 751                 }
 752         }
 753 }
 754
 755 static void pch_spi_set_ir(struct pch_spi_data *data)
 756 {
 757         /* enable interrupts, set threshold, enable SPI */
 758         if ((data->bpw_len) > PCH_MAX_FIFO_DEPTH)
 759                 /* set receive threshold to PCH_RX_THOLD */
 760                 pch_spi_setclr_reg(data->master, PCH_SPCR,
 761                                    PCH_RX_THOLD << SPCR_RFIC_FIELD |
 762                                    SPCR_FIE_BIT | SPCR_RFIE_BIT |
 763                                    SPCR_ORIE_BIT | SPCR_SPE_BIT,
 764                                    MASK_RFIC_SPCR_BITS | PCH_ALL);
 765         else
 766                 /* set receive threshold to maximum */
 767                 pch_spi_setclr_reg(data->master, PCH_SPCR,
 768                                    PCH_RX_THOLD_MAX << SPCR_RFIC_FIELD |
 769                                    SPCR_FIE_BIT | SPCR_ORIE_BIT |
 770                                    SPCR_SPE_BIT,
 771                                    MASK_RFIC_SPCR_BITS | PCH_ALL);
 772
 773         /* Wait until the transfer completes; go to sleep after
 774                                  initiating the transfer. */
 775         dev_dbg(&data->master->dev,
 776                 "%s:waiting for transfer to get over\n", __func__);
 777
 778         wait_event_interruptible(data->wait, data->transfer_complete);
 779
 780         /* clear all interrupts */
 781         pch_spi_writereg(data->master, PCH_SPSR,
 782                          pch_spi_readreg(data->master, PCH_SPSR));
 783         /* Disable interrupts and SPI transfer */
 784         pch_spi_setclr_reg(data->master, PCH_SPCR, 0, PCH_ALL | SPCR_SPE_BIT);
 785         /* clear FIFO */
 786         pch_spi_clear_fifo(data->master);
 787 }
 788
 789 static void pch_spi_copy_rx_data(struct pch_spi_data *data, int bpw)
 790 {
 791         int j;
 792         u8 *rx_buf;
 793         u16 *rx_sbuf;
 794
 795         /* copy Rx Data */
 796         if (!data->cur_trans->rx_buf)
 797                 return;
 798
 799         if (bpw == 8) {
 800                 rx_buf = data->cur_trans->rx_buf;
 801                 for (j = 0; j < data->bpw_len; j++)
 802                         *rx_buf++ = data->pkt_rx_buff[j] & 0xFF;
 803         } else {
 804                 rx_sbuf = data->cur_trans->rx_buf;
 805                 for (j = 0; j < data->bpw_len; j++)
 806                         *rx_sbuf++ = data->pkt_rx_buff[j];
 807         }
 808 }
 809
 810 static void pch_spi_copy_rx_data_for_dma(struct pch_spi_data *data, int bpw)
 811 {
 812         int j;
 813         u8 *rx_buf;
 814         u16 *rx_sbuf;
 815         const u8 *rx_dma_buf;
 816         const u16 *rx_dma_sbuf;
 817
 818         /* copy Rx Data */
 819         if (!data->cur_trans->rx_buf)
 820                 return;
 821
 822         if (bpw == 8) {
 823                 rx_buf = data->cur_trans->rx_buf;
 824                 rx_dma_buf = data->dma.rx_buf_virt;
 825                 for (j = 0; j < data->bpw_len; j++)
 826                         *rx_buf++ = *rx_dma_buf++ & 0xFF;
 827                 data->cur_trans->rx_buf = rx_buf;
 828         } else {
 829                 rx_sbuf = data->cur_trans->rx_buf;
 830                 rx_dma_sbuf = data->dma.rx_buf_virt;
 831                 for (j = 0; j < data->bpw_len; j++)
 832                         *rx_sbuf++ = *rx_dma_sbuf++;
 833                 data->cur_trans->rx_buf = rx_sbuf;
 834         }
 835 }
 836
 837 static int pch_spi_start_transfer(struct pch_spi_data *data)
 838 {
 839         struct pch_spi_dma_ctrl *dma;
 840         unsigned long flags;
 841         int rtn;
 842
 843         dma = &data->dma;
 844
 845         spin_lock_irqsave(&data->lock, flags);
 846
 847         /* disable interrupts, SPI set enable */
 848         pch_spi_setclr_reg(data->master, PCH_SPCR, SPCR_SPE_BIT, PCH_ALL);
 849
 850         spin_unlock_irqrestore(&data->lock, flags);
 851
 852         /* Wait until the transfer completes; go to sleep after
 853                                  initiating the transfer. */
 854         dev_dbg(&data->master->dev,
 855                 "%s:waiting for transfer to get over\n", __func__);
 856         rtn = wait_event_interruptible_timeout(data->wait,
 857                                                data->transfer_complete,
 858                                                msecs_to_jiffies(2 * HZ));
 859         if (!rtn)
 860                 dev_err(&data->master->dev,
 861                         "%s wait-event timeout\n", __func__);
 862
 863         dma_sync_sg_for_cpu(&data->master->dev, dma->sg_rx_p, dma->nent,
 864                             DMA_FROM_DEVICE);
 865
 866         dma_sync_sg_for_cpu(&data->master->dev, dma->sg_tx_p, dma->nent,
 867                             DMA_FROM_DEVICE);
 868         memset(data->dma.tx_buf_virt, 0, PAGE_SIZE);
 869
 870         async_tx_ack(dma->desc_rx);
 871         async_tx_ack(dma->desc_tx);
 872         kfree(dma->sg_tx_p);
 873         kfree(dma->sg_rx_p);
 874
 875         spin_lock_irqsave(&data->lock, flags);
 876
 877         /* clear fifo threshold, disable interrupts, disable SPI transfer */
 878         pch_spi_setclr_reg(data->master, PCH_SPCR, 0,
 879                            MASK_RFIC_SPCR_BITS | MASK_TFIC_SPCR_BITS | PCH_ALL |
 880                            SPCR_SPE_BIT);
 881         /* clear all interrupts */
 882         pch_spi_writereg(data->master, PCH_SPSR,
 883                          pch_spi_readreg(data->master, PCH_SPSR));
 884         /* clear FIFO */
 885         pch_spi_clear_fifo(data->master);
 886
 887         spin_unlock_irqrestore(&data->lock, flags);
 888
 889         return rtn;
 890 }
 891
 892 static void pch_dma_rx_complete(void *arg)
 893 {
 894         struct pch_spi_data *data = arg;
 895
 896         /* transfer is completed;inform pch_spi_process_messages_dma */
 897         data->transfer_complete = true;
 898         wake_up_interruptible(&data->wait);
 899 }
 900
 901 static bool pch_spi_filter(struct dma_chan *chan, void *slave)
 902 {
 903         struct pch_dma_slave *param = slave;
 904
 905         if ((chan->chan_id == param->chan_id) &&
 906             (param->dma_dev == chan->device->dev)) {
 907                 chan->private = param;
 908                 return true;
 909         } else {
 910                 return false;
 911         }
 912 }
 913
 914 static void pch_spi_request_dma(struct pch_spi_data *data, int bpw)
 915 {
 916         dma_cap_mask_t mask;
 917         struct dma_chan *chan;
 918         struct pci_dev *dma_dev;
 919         struct pch_dma_slave *param;
 920         struct pch_spi_dma_ctrl *dma;
 921         unsigned int width;
 922
 923         if (bpw == 8)
 924                 width = PCH_DMA_WIDTH_1_BYTE;
 925         else
 926                 width = PCH_DMA_WIDTH_2_BYTES;
 927
 928         dma = &data->dma;
 929         dma_cap_zero(mask);
 930         dma_cap_set(DMA_SLAVE, mask);
 931
 932         /* Get DMA's dev information */
 933         dma_dev = pci_get_bus_and_slot(data->board_dat->pdev->bus->number,
 934                                        PCI_DEVFN(12, 0));
 935
 936         /* Set Tx DMA */
 937         param = &dma->param_tx;
 938         param->dma_dev = &dma_dev->dev;
 939         param->chan_id = data->master->bus_num * 2; /* Tx = 0, 2 */
 940         param->tx_reg = data->io_base_addr + PCH_SPDWR;
 941         param->width = width;
 942         chan = dma_request_channel(mask, pch_spi_filter, param);
 943         if (!chan) {
 944                 dev_err(&data->master->dev,
 945                         "ERROR: dma_request_channel FAILS(Tx)\n");
 946                 data->use_dma = 0;
 947                 return;
 948         }
 949         dma->chan_tx = chan;
 950
 951         /* Set Rx DMA */
 952         param = &dma->param_rx;
 953         param->dma_dev = &dma_dev->dev;
 954         param->chan_id = data->master->bus_num * 2 + 1; /* Rx = Tx + 1 */
 955         param->rx_reg = data->io_base_addr + PCH_SPDRR;
 956         param->width = width;
 957         chan = dma_request_channel(mask, pch_spi_filter, param);
 958         if (!chan) {
 959                 dev_err(&data->master->dev,
 960                         "ERROR: dma_request_channel FAILS(Rx)\n");
 961                 dma_release_channel(dma->chan_tx);
 962                 dma->chan_tx = NULL;
 963                 data->use_dma = 0;
 964                 return;
 965         }
 966         dma->chan_rx = chan;
 967 }
 968
 969 static void pch_spi_release_dma(struct pch_spi_data *data)
 970 {
 971         struct pch_spi_dma_ctrl *dma;
 972
 973         dma = &data->dma;
 974         if (dma->chan_tx) {
 975                 dma_release_channel(dma->chan_tx);
 976                 dma->chan_tx = NULL;
 977         }
 978         if (dma->chan_rx) {
 979                 dma_release_channel(dma->chan_rx);
 980                 dma->chan_rx = NULL;
 981         }
 982         return;
 983 }
 984
 985 static void pch_spi_handle_dma(struct pch_spi_data *data, int *bpw)
 986 {
 987         const u8 *tx_buf;
 988         const u16 *tx_sbuf;
 989         u8 *tx_dma_buf;
 990         u16 *tx_dma_sbuf;
 991         struct scatterlist *sg;
 992         struct dma_async_tx_descriptor *desc_tx;
 993         struct dma_async_tx_descriptor *desc_rx;
 994         int num;
 995         int i;
 996         int size;
 997         int rem;
 998         int head;
 999         unsigned long flags;
1000         struct pch_spi_dma_ctrl *dma;
1001
1002         dma = &data->dma;
1003
1004         /* set baud rate if needed */
1005         if (data->cur_trans->speed_hz) {
1006                 dev_dbg(&data->master->dev, "%s:setting baud rate\n", __func__);
1007                 spin_lock_irqsave(&data->lock, flags);
1008                 pch_spi_set_baud_rate(data->master, data->cur_trans->speed_hz);
1009                 spin_unlock_irqrestore(&data->lock, flags);
1010         }
1011
1012         /* set bits per word if needed */
1013         if (data->cur_trans->bits_per_word &&
1014             (data->current_msg->spi->bits_per_word !=
1015              data->cur_trans->bits_per_word)) {
1016                 dev_dbg(&data->master->dev, "%s:set bits per word\n", __func__);
1017                 spin_lock_irqsave(&data->lock, flags);
1018                 pch_spi_set_bits_per_word(data->master,
1019                                           data->cur_trans->bits_per_word);
1020                 spin_unlock_irqrestore(&data->lock, flags);
1021                 *bpw = data->cur_trans->bits_per_word;
1022         } else {
1023                 *bpw = data->current_msg->spi->bits_per_word;
1024         }
1025         data->bpw_len = data->cur_trans->len / (*bpw / 8);
1026
1027         if (data->bpw_len > PCH_BUF_SIZE) {
1028                 data->bpw_len = PCH_BUF_SIZE;
1029                 data->cur_trans->len -= PCH_BUF_SIZE;
1030         }
1031
1032         /* copy Tx Data */
1033         if (data->cur_trans->tx_buf != NULL) {
1034                 if (*bpw == 8) {
1035                         tx_buf = data->cur_trans->tx_buf;
1036                         tx_dma_buf = dma->tx_buf_virt;
1037                         for (i = 0; i < data->bpw_len; i++)
1038                                 *tx_dma_buf++ = *tx_buf++;
1039                 } else {
1040                         tx_sbuf = data->cur_trans->tx_buf;
1041                         tx_dma_sbuf = dma->tx_buf_virt;
1042                         for (i = 0; i < data->bpw_len; i++)
1043                                 *tx_dma_sbuf++ = *tx_sbuf++;
1044                 }
1045         }
1046
1047         /* Calculate Rx parameter for DMA transmitting */
1048         if (data->bpw_len > PCH_DMA_TRANS_SIZE) {
1049                 if (data->bpw_len % PCH_DMA_TRANS_SIZE) {
1050                         num = data->bpw_len / PCH_DMA_TRANS_SIZE + 1;
1051                         rem = data->bpw_len % PCH_DMA_TRANS_SIZE;
1052                 } else {
1053                         num = data->bpw_len / PCH_DMA_TRANS_SIZE;
1054                         rem = PCH_DMA_TRANS_SIZE;
1055                 }
1056                 size = PCH_DMA_TRANS_SIZE;
1057         } else {
1058                 num = 1;
1059                 size = data->bpw_len;
1060                 rem = data->bpw_len;
1061         }
1062         dev_dbg(&data->master->dev, "%s num=%d size=%d rem=%d\n",
1063                 __func__, num, size, rem);
1064         spin_lock_irqsave(&data->lock, flags);
1065
1066         /* set receive fifo threshold and transmit fifo threshold */
1067         pch_spi_setclr_reg(data->master, PCH_SPCR,
1068                            ((size - 1) << SPCR_RFIC_FIELD) |
1069                            (PCH_TX_THOLD << SPCR_TFIC_FIELD),
1070                            MASK_RFIC_SPCR_BITS | MASK_TFIC_SPCR_BITS);
1071
1072         spin_unlock_irqrestore(&data->lock, flags);
1073
1074         /* RX */
1075         dma->sg_rx_p = kzalloc(sizeof(struct scatterlist)*num, GFP_ATOMIC);
1076         sg_init_table(dma->sg_rx_p, num); /* Initialize SG table */
1077         /* offset, length setting */
1078         sg = dma->sg_rx_p;
1079         for (i = 0; i < num; i++, sg++) {
1080                 if (i == (num - 2)) {
1081                         sg->offset = size * i;
1082                         sg->offset = sg->offset * (*bpw / 8);
1083                         sg_set_page(sg, virt_to_page(dma->rx_buf_virt), rem,
1084                                     sg->offset);
1085                         sg_dma_len(sg) = rem;
1086                 } else if (i == (num - 1)) {
1087                         sg->offset = size * (i - 1) + rem;
1088                         sg->offset = sg->offset * (*bpw / 8);
1089                         sg_set_page(sg, virt_to_page(dma->rx_buf_virt), size,
1090                                     sg->offset);
1091                         sg_dma_len(sg) = size;
1092                 } else {
1093                         sg->offset = size * i;
1094                         sg->offset = sg->offset * (*bpw / 8);
1095                         sg_set_page(sg, virt_to_page(dma->rx_buf_virt), size,
1096                                     sg->offset);
1097                         sg_dma_len(sg) = size;
1098                 }
1099                 sg_dma_address(sg) = dma->rx_buf_dma + sg->offset;
1100         }
1101         sg = dma->sg_rx_p;
1102         desc_rx = dma->chan_rx->device->device_prep_slave_sg(dma->chan_rx, sg,
1103                                         num, DMA_DEV_TO_MEM,
1104                                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1105         if (!desc_rx) {
1106                 dev_err(&data->master->dev, "%s:device_prep_slave_sg Failed\n",
1107                         __func__);
1108                 return;
1109         }
1110         dma_sync_sg_for_device(&data->master->dev, sg, num, DMA_FROM_DEVICE);
1111         desc_rx->callback = pch_dma_rx_complete;
1112         desc_rx->callback_param = data;
1113         dma->nent = num;
1114         dma->desc_rx = desc_rx;
1115
1116         /* Calculate Tx parameter for DMA transmitting */
1117         if (data->bpw_len > PCH_MAX_FIFO_DEPTH) {
1118                 head = PCH_MAX_FIFO_DEPTH - PCH_DMA_TRANS_SIZE;
1119                 if (data->bpw_len % PCH_DMA_TRANS_SIZE > 4) {
1120                         num = data->bpw_len / PCH_DMA_TRANS_SIZE + 1;
1121                         rem = data->bpw_len % PCH_DMA_TRANS_SIZE - head;
1122                 } else {
1123                         num = data->bpw_len / PCH_DMA_TRANS_SIZE;
1124                         rem = data->bpw_len % PCH_DMA_TRANS_SIZE +
1125                               PCH_DMA_TRANS_SIZE - head;
1126                 }
1127                 size = PCH_DMA_TRANS_SIZE;
1128         } else {
1129                 num = 1;
1130                 size = data->bpw_len;
1131                 rem = data->bpw_len;
1132                 head = 0;
1133         }
1134
1135         dma->sg_tx_p = kzalloc(sizeof(struct scatterlist)*num, GFP_ATOMIC);
1136         sg_init_table(dma->sg_tx_p, num); /* Initialize SG table */
1137         /* offset, length setting */
1138         sg = dma->sg_tx_p;
1139         for (i = 0; i < num; i++, sg++) {
1140                 if (i == 0) {
1141                         sg->offset = 0;
1142                         sg_set_page(sg, virt_to_page(dma->tx_buf_virt), size + head,
1143                                     sg->offset);
1144                         sg_dma_len(sg) = size + head;
1145                 } else if (i == (num - 1)) {
1146                         sg->offset = head + size * i;
1147                         sg->offset = sg->offset * (*bpw / 8);
1148                         sg_set_page(sg, virt_to_page(dma->tx_buf_virt), rem,
1149                                     sg->offset);
1150                         sg_dma_len(sg) = rem;
1151                 } else {
1152                         sg->offset = head + size * i;
1153                         sg->offset = sg->offset * (*bpw / 8);
1154                         sg_set_page(sg, virt_to_page(dma->tx_buf_virt), size,
1155                                     sg->offset);
1156                         sg_dma_len(sg) = size;
1157                 }
1158                 sg_dma_address(sg) = dma->tx_buf_dma + sg->offset;
1159         }
1160         sg = dma->sg_tx_p;
1161         desc_tx = dma->chan_tx->device->device_prep_slave_sg(dma->chan_tx,
1162                                         sg, num, DMA_MEM_TO_DEV,
1163                                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1164         if (!desc_tx) {
1165                 dev_err(&data->master->dev, "%s:device_prep_slave_sg Failed\n",
1166                         __func__);
1167                 return;
1168         }
1169         dma_sync_sg_for_device(&data->master->dev, sg, num, DMA_TO_DEVICE);
1170         desc_tx->callback = NULL;
1171         desc_tx->callback_param = data;
1172         dma->nent = num;
1173         dma->desc_tx = desc_tx;
1174
1175         dev_dbg(&data->master->dev, "\n%s:Pulling down SSN low - writing "
1176                 "0x2 to SSNXCR\n", __func__);
1177
1178         spin_lock_irqsave(&data->lock, flags);
1179         pch_spi_writereg(data->master, PCH_SSNXCR, SSN_LOW);
1180         desc_rx->tx_submit(desc_rx);
1181         desc_tx->tx_submit(desc_tx);
1182         spin_unlock_irqrestore(&data->lock, flags);
1183
1184         /* reset transfer complete flag */
1185         data->transfer_complete = false;
1186 }
1187
1188 static void pch_spi_process_messages(struct work_struct *pwork)
1189 {
1190         struct spi_message *pmsg;
1191         struct pch_spi_data *data;
1192         int bpw;
1193
1194         data = container_of(pwork, struct pch_spi_data, work);
1195         dev_dbg(&data->master->dev, "%s data initialized\n", __func__);
1196
1197         spin_lock(&data->lock);
1198         /* check if suspend has been initiated;if yes flush queue */
1199         if (data->board_dat->suspend_sts || (data->status == STATUS_EXITING)) {
1200                 dev_dbg(&data->master->dev, "%s suspend/remove initiated,"
1201                         "flushing queue\n", __func__);
1202                 list_for_each_entry(pmsg, data->queue.next, queue) {
1203                         pmsg->status = -EIO;
1204
1205                         if (pmsg->complete != 0) {
1206                                 spin_unlock(&data->lock);
1207                                 pmsg->complete(pmsg->context);
1208                                 spin_lock(&data->lock);
1209                         }
1210
1211                         /* delete from queue */
1212                         list_del_init(&pmsg->queue);
1213                 }
1214
1215                 spin_unlock(&data->lock);
1216                 return;
1217         }
1218
1219         data->bcurrent_msg_processing = true;
1220         dev_dbg(&data->master->dev,
1221                 "%s Set data->bcurrent_msg_processing= true\n", __func__);
1222
1223         /* Get the message from the queue and delete it from there. */
1224         data->current_msg = list_entry(data->queue.next, struct spi_message,
1225                                         queue);
1226
1227         list_del_init(&data->current_msg->queue);
1228
1229         data->current_msg->status = 0;
1230
1231         pch_spi_select_chip(data, data->current_msg->spi);
1232
1233         spin_unlock(&data->lock);
1234
1235         if (data->use_dma)
1236                 pch_spi_request_dma(data,
1237                                     data->current_msg->spi->bits_per_word);
1238         pch_spi_writereg(data->master, PCH_SSNXCR, SSN_NO_CONTROL);
1239         do {
1240                 int cnt;
1241                 /* If we are already processing a message get the next
1242                 transfer structure from the message otherwise retrieve
1243                 the 1st transfer request from the message. */
1244                 spin_lock(&data->lock);
1245                 if (data->cur_trans == NULL) {
1246                         data->cur_trans =
1247                                 list_entry(data->current_msg->transfers.next,
1248                                            struct spi_transfer, transfer_list);
1249                         dev_dbg(&data->master->dev, "%s "
1250                                 ":Getting 1st transfer message\n", __func__);
1251                 } else {
1252                         data->cur_trans =
1253                                 list_entry(data->cur_trans->transfer_list.next,
1254                                            struct spi_transfer, transfer_list);
1255                         dev_dbg(&data->master->dev, "%s "
1256                                 ":Getting next transfer message\n", __func__);
1257                 }
1258                 spin_unlock(&data->lock);
1259
1260                 if (!data->cur_trans->len)
1261                         goto out;
1262                 cnt = (data->cur_trans->len - 1) / PCH_BUF_SIZE + 1;
1263                 data->save_total_len = data->cur_trans->len;
1264                 if (data->use_dma) {
1265                         int i;
1266                         char *save_rx_buf = data->cur_trans->rx_buf;
1267                         for (i = 0; i < cnt; i ++) {
1268                                 pch_spi_handle_dma(data, &bpw);
1269                                 if (!pch_spi_start_transfer(data)) {
1270                                         data->transfer_complete = true;
1271                                         data->current_msg->status = -EIO;
1272                                         data->current_msg->complete
1273                                                    (data->current_msg->context);
1274                                         data->bcurrent_msg_processing = false;
1275                                         data->current_msg = NULL;
1276                                         data->cur_trans = NULL;
1277                                         goto out;
1278                                 }
1279                                 pch_spi_copy_rx_data_for_dma(data, bpw);
1280                         }
1281                         data->cur_trans->rx_buf = save_rx_buf;
1282                 } else {
1283                         pch_spi_set_tx(data, &bpw);
1284                         pch_spi_set_ir(data);
1285                         pch_spi_copy_rx_data(data, bpw);
1286                         kfree(data->pkt_rx_buff);
1287                         data->pkt_rx_buff = NULL;
1288                         kfree(data->pkt_tx_buff);
1289                         data->pkt_tx_buff = NULL;
1290                 }
1291                 /* increment message count */
1292                 data->cur_trans->len = data->save_total_len;
1293                 data->current_msg->actual_length += data->cur_trans->len;
1294
1295                 dev_dbg(&data->master->dev,
1296                         "%s:data->current_msg->actual_length=%d\n",
1297                         __func__, data->current_msg->actual_length);
1298
1299                 /* check for delay */
1300                 if (data->cur_trans->delay_usecs) {
1301                         dev_dbg(&data->master->dev, "%s:"
1302                                 "delay in usec=%d\n", __func__,
1303                                 data->cur_trans->delay_usecs);
1304                         udelay(data->cur_trans->delay_usecs);
1305                 }
1306
1307                 spin_lock(&data->lock);
1308
1309                 /* No more transfer in this message. */
1310                 if ((data->cur_trans->transfer_list.next) ==
1311                     &(data->current_msg->transfers)) {
1312                         pch_spi_nomore_transfer(data);
1313                 }
1314
1315                 spin_unlock(&data->lock);
1316
1317         } while (data->cur_trans != NULL);
1318
1319 out:
1320         pch_spi_writereg(data->master, PCH_SSNXCR, SSN_HIGH);
1321         if (data->use_dma)
1322                 pch_spi_release_dma(data);
1323 }
1324
1325 static void pch_spi_free_resources(struct pch_spi_board_data *board_dat,
1326                                    struct pch_spi_data *data)
1327 {
1328         dev_dbg(&board_dat->pdev->dev, "%s ENTRY\n", __func__);
1329
1330         /* free workqueue */
1331         if (data->wk != NULL) {
1332                 destroy_workqueue(data->wk);
1333                 data->wk = NULL;
1334                 dev_dbg(&board_dat->pdev->dev,
1335                         "%s destroy_workqueue invoked successfully\n",
1336                         __func__);
1337         }
1338 }
1339
1340 static int pch_spi_get_resources(struct pch_spi_board_data *board_dat,
1341                                  struct pch_spi_data *data)
1342 {
1343         int retval = 0;
1344
1345         dev_dbg(&board_dat->pdev->dev, "%s ENTRY\n", __func__);
1346
1347         /* create workqueue */
1348         data->wk = create_singlethread_workqueue(KBUILD_MODNAME);
1349         if (!data->wk) {
1350                 dev_err(&board_dat->pdev->dev,
1351                         "%s create_singlet hread_workqueue failed\n", __func__);
1352                 retval = -EBUSY;
1353                 goto err_return;
1354         }
1355
1356         /* reset PCH SPI h/w */
1357         pch_spi_reset(data->master);
1358         dev_dbg(&board_dat->pdev->dev,
1359                 "%s pch_spi_reset invoked successfully\n", __func__);
1360
1361         dev_dbg(&board_dat->pdev->dev, "%s data->irq_reg_sts=true\n", __func__);
1362
1363 err_return:
1364         if (retval != 0) {
1365                 dev_err(&board_dat->pdev->dev,
1366                         "%s FAIL:invoking pch_spi_free_resources\n", __func__);
1367                 pch_spi_free_resources(board_dat, data);
1368         }
1369
1370         dev_dbg(&board_dat->pdev->dev, "%s Return=%d\n", __func__, retval);
1371
1372         return retval;
1373 }
1374
1375 static void pch_free_dma_buf(struct pch_spi_board_data *board_dat,
1376                              struct pch_spi_data *data)
1377 {
1378         struct pch_spi_dma_ctrl *dma;
1379
1380         dma = &data->dma;
1381         if (dma->tx_buf_dma)
1382                 dma_free_coherent(&board_dat->pdev->dev, PCH_BUF_SIZE,
1383                                   dma->tx_buf_virt, dma->tx_buf_dma);
1384         if (dma->rx_buf_dma)
1385                 dma_free_coherent(&board_dat->pdev->dev, PCH_BUF_SIZE,
1386                                   dma->rx_buf_virt, dma->rx_buf_dma);
1387         return;
1388 }
1389
1390 static void pch_alloc_dma_buf(struct pch_spi_board_data *board_dat,
1391                               struct pch_spi_data *data)
1392 {
1393         struct pch_spi_dma_ctrl *dma;
1394
1395         dma = &data->dma;
1396         /* Get Consistent memory for Tx DMA */
1397         dma->tx_buf_virt = dma_alloc_coherent(&board_dat->pdev->dev,
1398                                 PCH_BUF_SIZE, &dma->tx_buf_dma, GFP_KERNEL);
1399         /* Get Consistent memory for Rx DMA */
1400         dma->rx_buf_virt = dma_alloc_coherent(&board_dat->pdev->dev,
1401                                 PCH_BUF_SIZE, &dma->rx_buf_dma, GFP_KERNEL);
1402 }
1403
1404 static int __devinit pch_spi_pd_probe(struct platform_device *plat_dev)
1405 {
1406         int ret;
1407         struct spi_master *master;
1408         struct pch_spi_board_data *board_dat = dev_get_platdata(&plat_dev->dev);
1409         struct pch_spi_data *data;
1410
1411         dev_dbg(&plat_dev->dev, "%s:debug\n", __func__);
1412
1413         master = spi_alloc_master(&board_dat->pdev->dev,
1414                                   sizeof(struct pch_spi_data));
1415         if (!master) {
1416                 dev_err(&plat_dev->dev, "spi_alloc_master[%d] failed.\n",
1417                         plat_dev->id);
1418                 return -ENOMEM;
1419         }
1420
1421         data = spi_master_get_devdata(master);
1422         data->master = master;
1423
1424         platform_set_drvdata(plat_dev, data);
1425
1426         /* baseaddress + address offset) */
1427         data->io_base_addr = pci_resource_start(board_dat->pdev, 1) +
1428                                          PCH_ADDRESS_SIZE * plat_dev->id;
1429         data->io_remap_addr = pci_iomap(board_dat->pdev, 1, 0) +
1430                                          PCH_ADDRESS_SIZE * plat_dev->id;
1431         if (!data->io_remap_addr) {
1432                 dev_err(&plat_dev->dev, "%s pci_iomap failed\n", __func__);
1433                 ret = -ENOMEM;
1434                 goto err_pci_iomap;
1435         }
1436
1437         dev_dbg(&plat_dev->dev, "[ch%d] remap_addr=%p\n",
1438                 plat_dev->id, data->io_remap_addr);
1439
1440         /* initialize members of SPI master */
1441         master->bus_num = -1;
1442         master->num_chipselect = PCH_MAX_CS;
1443         master->setup = pch_spi_setup;
1444         master->transfer = pch_spi_transfer;
1445         master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST;
1446
1447         data->board_dat = board_dat;
1448         data->plat_dev = plat_dev;
1449         data->n_curnt_chip = 255;
1450         data->status = STATUS_RUNNING;
1451         data->ch = plat_dev->id;
1452         data->use_dma = use_dma;
1453
1454         INIT_LIST_HEAD(&data->queue);
1455         spin_lock_init(&data->lock);
1456         INIT_WORK(&data->work, pch_spi_process_messages);
1457         init_waitqueue_head(&data->wait);
1458
1459         ret = pch_spi_get_resources(board_dat, data);
1460         if (ret) {
1461                 dev_err(&plat_dev->dev, "%s fail(retval=%d)\n", __func__, ret);
1462                 goto err_spi_get_resources;
1463         }
1464
1465         ret = request_irq(board_dat->pdev->irq, pch_spi_handler,
1466                           IRQF_SHARED, KBUILD_MODNAME, data);
1467         if (ret) {
1468                 dev_err(&plat_dev->dev,
1469                         "%s request_irq failed\n", __func__);
1470                 goto err_request_irq;
1471         }
1472         data->irq_reg_sts = true;
1473
1474         pch_spi_set_master_mode(master);
1475
1476         ret = spi_register_master(master);
1477         if (ret != 0) {
1478                 dev_err(&plat_dev->dev,
1479                         "%s spi_register_master FAILED\n", __func__);
1480                 goto err_spi_register_master;
1481         }
1482
1483         if (use_dma) {
1484                 dev_info(&plat_dev->dev, "Use DMA for data transfers\n");
1485                 pch_alloc_dma_buf(board_dat, data);
1486         }
1487
1488         return 0;
1489
1490 err_spi_register_master:
1491         free_irq(board_dat->pdev->irq, board_dat);
1492 err_request_irq:
1493         pch_spi_free_resources(board_dat, data);
1494 err_spi_get_resources:
1495         pci_iounmap(board_dat->pdev, data->io_remap_addr);
1496 err_pci_iomap:
1497         spi_master_put(master);
1498
1499         return ret;
1500 }
1501
1502 static int __devexit pch_spi_pd_remove(struct platform_device *plat_dev)
1503 {
1504         struct pch_spi_board_data *board_dat = dev_get_platdata(&plat_dev->dev);
1505         struct pch_spi_data *data = platform_get_drvdata(plat_dev);
1506         int count;
1507         unsigned long flags;
1508
1509         dev_dbg(&plat_dev->dev, "%s:[ch%d] irq=%d\n",
1510                 __func__, plat_dev->id, board_dat->pdev->irq);
1511
1512         if (use_dma)
1513                 pch_free_dma_buf(board_dat, data);
1514
1515         /* check for any pending messages; no action is taken if the queue
1516          * is still full; but at least we tried.  Unload anyway */
1517         count = 500;
1518         spin_lock_irqsave(&data->lock, flags);
1519         data->status = STATUS_EXITING;
1520         while ((list_empty(&data->queue) == 0) && --count) {
1521                 dev_dbg(&board_dat->pdev->dev, "%s :queue not empty\n",
1522                         __func__);
1523                 spin_unlock_irqrestore(&data->lock, flags);
1524                 msleep(PCH_SLEEP_TIME);
1525                 spin_lock_irqsave(&data->lock, flags);
1526         }
1527         spin_unlock_irqrestore(&data->lock, flags);
1528
1529         pch_spi_free_resources(board_dat, data);
1530         /* disable interrupts & free IRQ */
1531         if (data->irq_reg_sts) {
1532                 /* disable interrupts */
1533                 pch_spi_setclr_reg(data->master, PCH_SPCR, 0, PCH_ALL);
1534                 data->irq_reg_sts = false;
1535                 free_irq(board_dat->pdev->irq, data);
1536         }
1537
1538         pci_iounmap(board_dat->pdev, data->io_remap_addr);
1539         spi_unregister_master(data->master);
1540         spi_master_put(data->master);
1541         platform_set_drvdata(plat_dev, NULL);
1542
1543         return 0;
1544 }
1545 #ifdef CONFIG_PM
1546 static int pch_spi_pd_suspend(struct platform_device *pd_dev,
1547                               pm_message_t state)
1548 {
1549         u8 count;
1550         struct pch_spi_board_data *board_dat = dev_get_platdata(&pd_dev->dev);
1551         struct pch_spi_data *data = platform_get_drvdata(pd_dev);
1552
1553         dev_dbg(&pd_dev->dev, "%s ENTRY\n", __func__);
1554
1555         if (!board_dat) {
1556                 dev_err(&pd_dev->dev,
1557                         "%s pci_get_drvdata returned NULL\n", __func__);
1558                 return -EFAULT;
1559         }
1560
1561         /* check if the current message is processed:
1562            Only after thats done the transfer will be suspended */
1563         count = 255;
1564         while ((--count) > 0) {
1565                 if (!(data->bcurrent_msg_processing))
1566                         break;
1567                 msleep(PCH_SLEEP_TIME);
1568         }
1569
1570         /* Free IRQ */
1571         if (data->irq_reg_sts) {
1572                 /* disable all interrupts */
1573                 pch_spi_setclr_reg(data->master, PCH_SPCR, 0, PCH_ALL);
1574                 pch_spi_reset(data->master);
1575                 free_irq(board_dat->pdev->irq, data);
1576
1577                 data->irq_reg_sts = false;
1578                 dev_dbg(&pd_dev->dev,
1579                         "%s free_irq invoked successfully.\n", __func__);
1580         }
1581
1582         return 0;
1583 }
1584
1585 static int pch_spi_pd_resume(struct platform_device *pd_dev)
1586 {
1587         struct pch_spi_board_data *board_dat = dev_get_platdata(&pd_dev->dev);
1588         struct pch_spi_data *data = platform_get_drvdata(pd_dev);
1589         int retval;
1590
1591         if (!board_dat) {
1592                 dev_err(&pd_dev->dev,
1593                         "%s pci_get_drvdata returned NULL\n", __func__);
1594                 return -EFAULT;
1595         }
1596
1597         if (!data->irq_reg_sts) {
1598                 /* register IRQ */
1599                 retval = request_irq(board_dat->pdev->irq, pch_spi_handler,
1600                                      IRQF_SHARED, KBUILD_MODNAME, data);
1601                 if (retval < 0) {
1602                         dev_err(&pd_dev->dev,
1603                                 "%s request_irq failed\n", __func__);
1604                         return retval;
1605                 }
1606
1607                 /* reset PCH SPI h/w */
1608                 pch_spi_reset(data->master);
1609                 pch_spi_set_master_mode(data->master);
1610                 data->irq_reg_sts = true;
1611         }
1612         return 0;
1613 }
1614 #else
1615 #define pch_spi_pd_suspend NULL
1616 #define pch_spi_pd_resume NULL
1617 #endif
1618
1619 static struct platform_driver pch_spi_pd_driver = {
1620         .driver = {
1621                 .name = "pch-spi",
1622                 .owner = THIS_MODULE,
1623         },
1624         .probe = pch_spi_pd_probe,
1625         .remove = __devexit_p(pch_spi_pd_remove),
1626         .suspend = pch_spi_pd_suspend,
1627         .resume = pch_spi_pd_resume
1628 };
1629
1630 static int __devinit pch_spi_probe(struct pci_dev *pdev,
1631                                    const struct pci_device_id *id)
1632 {
1633         struct pch_spi_board_data *board_dat;
1634         struct platform_device *pd_dev = NULL;
1635         int retval;
1636         int i;
1637         struct pch_pd_dev_save *pd_dev_save;
1638
1639         pd_dev_save = kzalloc(sizeof(struct pch_pd_dev_save), GFP_KERNEL);
1640         if (!pd_dev_save) {
1641                 dev_err(&pdev->dev, "%s Can't allocate pd_dev_sav\n", __func__);
1642                 return -ENOMEM;
1643         }
1644
1645         board_dat = kzalloc(sizeof(struct pch_spi_board_data), GFP_KERNEL);
1646         if (!board_dat) {
1647                 dev_err(&pdev->dev, "%s Can't allocate board_dat\n", __func__);
1648                 retval = -ENOMEM;
1649                 goto err_no_mem;
1650         }
1651
1652         retval = pci_request_regions(pdev, KBUILD_MODNAME);
1653         if (retval) {
1654                 dev_err(&pdev->dev, "%s request_region failed\n", __func__);
1655                 goto pci_request_regions;
1656         }
1657
1658         board_dat->pdev = pdev;
1659         board_dat->num = id->driver_data;
1660         pd_dev_save->num = id->driver_data;
1661         pd_dev_save->board_dat = board_dat;
1662
1663         retval = pci_enable_device(pdev);
1664         if (retval) {
1665                 dev_err(&pdev->dev, "%s pci_enable_device failed\n", __func__);
1666                 goto pci_enable_device;
1667         }
1668
1669         for (i = 0; i < board_dat->num; i++) {
1670                 pd_dev = platform_device_alloc("pch-spi", i);
1671                 if (!pd_dev) {
1672                         dev_err(&pdev->dev, "platform_device_alloc failed\n");
1673                         goto err_platform_device;
1674                 }
1675                 pd_dev_save->pd_save[i] = pd_dev;
1676                 pd_dev->dev.parent = &pdev->dev;
1677
1678                 retval = platform_device_add_data(pd_dev, board_dat,
1679                                                   sizeof(*board_dat));
1680                 if (retval) {
1681                         dev_err(&pdev->dev,
1682                                 "platform_device_add_data failed\n");
1683                         platform_device_put(pd_dev);
1684                         goto err_platform_device;
1685                 }
1686
1687                 retval = platform_device_add(pd_dev);
1688                 if (retval) {
1689                         dev_err(&pdev->dev, "platform_device_add failed\n");
1690                         platform_device_put(pd_dev);
1691                         goto err_platform_device;
1692                 }
1693         }
1694
1695         pci_set_drvdata(pdev, pd_dev_save);
1696
1697         return 0;
1698
1699 err_platform_device:
1700         pci_disable_device(pdev);
1701 pci_enable_device:
1702         pci_release_regions(pdev);
1703 pci_request_regions:
1704         kfree(board_dat);
1705 err_no_mem:
1706         kfree(pd_dev_save);
1707
1708         return retval;
1709 }
1710
1711 static void __devexit pch_spi_remove(struct pci_dev *pdev)
1712 {
1713         int i;
1714         struct pch_pd_dev_save *pd_dev_save = pci_get_drvdata(pdev);
1715
1716         dev_dbg(&pdev->dev, "%s ENTRY:pdev=%p\n", __func__, pdev);
1717
1718         for (i = 0; i < pd_dev_save->num; i++)
1719                 platform_device_unregister(pd_dev_save->pd_save[i]);
1720
1721         pci_disable_device(pdev);
1722         pci_release_regions(pdev);
1723         kfree(pd_dev_save->board_dat);
1724         kfree(pd_dev_save);
1725 }
1726
1727 #ifdef CONFIG_PM
1728 static int pch_spi_suspend(struct pci_dev *pdev, pm_message_t state)
1729 {
1730         int retval;
1731         struct pch_pd_dev_save *pd_dev_save = pci_get_drvdata(pdev);
1732
1733         dev_dbg(&pdev->dev, "%s ENTRY\n", __func__);
1734
1735         pd_dev_save->board_dat->suspend_sts = true;
1736
1737         /* save config space */
1738         retval = pci_save_state(pdev);
1739         if (retval == 0) {
1740                 pci_enable_wake(pdev, PCI_D3hot, 0);
1741                 pci_disable_device(pdev);
1742                 pci_set_power_state(pdev, PCI_D3hot);
1743         } else {
1744                 dev_err(&pdev->dev, "%s pci_save_state failed\n", __func__);
1745         }
1746
1747         return retval;
1748 }
1749
1750 static int pch_spi_resume(struct pci_dev *pdev)
1751 {
1752         int retval;
1753         struct pch_pd_dev_save *pd_dev_save = pci_get_drvdata(pdev);
1754         dev_dbg(&pdev->dev, "%s ENTRY\n", __func__);
1755
1756         pci_set_power_state(pdev, PCI_D0);
1757         pci_restore_state(pdev);
1758
1759         retval = pci_enable_device(pdev);
1760         if (retval < 0) {
1761                 dev_err(&pdev->dev,
1762                         "%s pci_enable_device failed\n", __func__);
1763         } else {
1764                 pci_enable_wake(pdev, PCI_D3hot, 0);
1765
1766                 /* set suspend status to false */
1767                 pd_dev_save->board_dat->suspend_sts = false;
1768         }
1769
1770         return retval;
1771 }
1772 #else
1773 #define pch_spi_suspend NULL
1774 #define pch_spi_resume NULL
1775
1776 #endif
1777
1778 static struct pci_driver pch_spi_pcidev_driver = {
1779         .name = "pch_spi",
1780         .id_table = pch_spi_pcidev_id,
1781         .probe = pch_spi_probe,
1782         .remove = pch_spi_remove,
1783         .suspend = pch_spi_suspend,
1784         .resume = pch_spi_resume,
1785 };
1786
1787 static int __init pch_spi_init(void)
1788 {
1789         int ret;
1790         ret = platform_driver_register(&pch_spi_pd_driver);
1791         if (ret)
1792                 return ret;
1793
1794         ret = pci_register_driver(&pch_spi_pcidev_driver);
1795         if (ret)
1796                 return ret;
1797
1798         return 0;
1799 }
1800 module_init(pch_spi_init);
1801
1802 static void __exit pch_spi_exit(void)
1803 {
1804         pci_unregister_driver(&pch_spi_pcidev_driver);
1805         platform_driver_unregister(&pch_spi_pd_driver);
1806 }
1807 module_exit(pch_spi_exit);
1808
1809 module_param(use_dma, int, 0644);
1810 MODULE_PARM_DESC(use_dma,
1811                  "to use DMA for data transfers pass 1 else 0; default 1");
1812
1813 MODULE_LICENSE("GPL");
1814 MODULE_DESCRIPTION("Intel EG20T PCH/LAPIS Semiconductor ML7xxx IOH SPI Driver");