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