Lines Matching +full:spi +full:- +full:rx +full:- +full:bus +full:- +full:width
2 * SPI bus driver for the Topcliff PCH used by Intel SoCs
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
23 #include <linux/spi/spi.h>
26 #include <linux/spi/spidev.h>
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 */
41 #define PCH_SRST 0x1C /* SPI reset register */
91 #define MASK_SPBRR_SPBR_BITS ((1 << 10) - 1)
105 * Set the number of SPI instance max
136 * struct pch_spi_data - Holds the SPI channel specific details
138 * @master: Pointer to the SPI master structure
144 * @transfer_complete: Status of SPI Transfer
147 * @queue: SPI Message queue
148 * @status: Status of the SPI driver
158 * @n_curnt_chip: The chip number that this SPI driver currently
160 * @current_chip: Reference to the current chip that this SPI
162 * @current_msg: The current message that this SPI driver is
164 * @cur_trans: The current transfer that this SPI driver is
166 * @board_dat: Reference to the SPI device data structure
168 * @ch: SPI channel number
202 * struct pch_spi_board_data - Holds the SPI device specific details
205 * @num: The number of SPI device instance
228 * pch_spi_writereg() - Performs register writes
236 iowrite32(val, (data->io_remap_addr + idx)); in pch_spi_writereg()
240 * pch_spi_readreg() - Performs register reads
247 return ioread32(data->io_remap_addr + idx); in pch_spi_readreg()
264 * pch_spi_clear_fifo() - Clears the Transmit and Receive FIFOs
287 if (data->transfer_active) { in pch_spi_handler_sub()
288 rx_index = data->rx_index; in pch_spi_handler_sub()
289 tx_index = data->tx_index; in pch_spi_handler_sub()
290 bpw_len = data->bpw_len; in pch_spi_handler_sub()
291 pkt_rx_buffer = data->pkt_rx_buff; in pch_spi_handler_sub()
292 pkt_tx_buff = data->pkt_tx_buff; in pch_spi_handler_sub()
306 if ((bpw_len - rx_index) <= PCH_MAX_FIFO_DEPTH) { in pch_spi_handler_sub()
310 /* reset rx threshold */ in pch_spi_handler_sub()
318 data->tx_index = tx_index; in pch_spi_handler_sub()
319 data->rx_index = rx_index; in pch_spi_handler_sub()
327 pch_spi_setclr_reg(data->master, PCH_SPCR, 0, PCH_ALL); in pch_spi_handler_sub()
331 data->transfer_complete = true; in pch_spi_handler_sub()
332 data->transfer_active = false; in pch_spi_handler_sub()
333 wake_up(&data->wait); in pch_spi_handler_sub()
335 dev_err(&data->master->dev, in pch_spi_handler_sub()
342 * pch_spi_handler() - Interrupt handler
353 struct pch_spi_board_data *board_dat = data->board_dat; in pch_spi_handler()
355 if (board_dat->suspend_sts) { in pch_spi_handler()
356 dev_dbg(&board_dat->pdev->dev, in pch_spi_handler()
361 io_remap_addr = data->io_remap_addr; in pch_spi_handler()
367 dev_err(&board_dat->pdev->dev, "%s Over run error\n", __func__); in pch_spi_handler()
368 if (data->current_msg->complete != 0) { in pch_spi_handler()
369 data->transfer_complete = true; in pch_spi_handler()
370 data->current_msg->status = -EIO; in pch_spi_handler()
371 data->current_msg->complete(data->current_msg->context); in pch_spi_handler()
372 data->bcurrent_msg_processing = false; in pch_spi_handler()
373 data->current_msg = NULL; in pch_spi_handler()
374 data->cur_trans = NULL; in pch_spi_handler()
378 if (data->use_dma) in pch_spi_handler()
381 /* Check if the interrupt is for SPI device */ in pch_spi_handler()
387 dev_dbg(&board_dat->pdev->dev, "%s EXIT return value=%d\n", in pch_spi_handler()
394 * pch_spi_set_baud_rate() - Sets SPBR field in SPBRR
410 * pch_spi_set_bits_per_word() - Sets SIZE field in SPBRR
412 * @bits_per_word: Bits per word for SPI transfer.
424 * pch_spi_setup_transfer() - Configures the PCH SPI hardware for transfer
425 * @spi: Pointer to struct spi_device.
427 static void pch_spi_setup_transfer(struct spi_device *spi) in pch_spi_setup_transfer() argument
431 dev_dbg(&spi->dev, "%s SPBRR content =%x setting baud rate=%d\n", in pch_spi_setup_transfer()
432 __func__, pch_spi_readreg(spi->master, PCH_SPBRR), in pch_spi_setup_transfer()
433 spi->max_speed_hz); in pch_spi_setup_transfer()
434 pch_spi_set_baud_rate(spi->master, spi->max_speed_hz); in pch_spi_setup_transfer()
437 pch_spi_set_bits_per_word(spi->master, spi->bits_per_word); in pch_spi_setup_transfer()
439 if (!(spi->mode & SPI_LSB_FIRST)) in pch_spi_setup_transfer()
441 if (spi->mode & SPI_CPOL) in pch_spi_setup_transfer()
443 if (spi->mode & SPI_CPHA) in pch_spi_setup_transfer()
445 pch_spi_setclr_reg(spi->master, PCH_SPCR, flags, in pch_spi_setup_transfer()
449 pch_spi_clear_fifo(spi->master); in pch_spi_setup_transfer()
453 * pch_spi_reset() - Clears SPI registers
458 /* write 1 to reset SPI */ in pch_spi_reset()
468 if (pspi->bits_per_word == 0) { in pch_spi_setup()
469 pspi->bits_per_word = 8; in pch_spi_setup()
470 dev_dbg(&pspi->dev, "%s 8 bits per word\n", __func__); in pch_spi_setup()
473 if ((pspi->bits_per_word != 8) && (pspi->bits_per_word != 16)) { in pch_spi_setup()
474 dev_err(&pspi->dev, "%s Invalid bits per word\n", __func__); in pch_spi_setup()
475 return -EINVAL; in pch_spi_setup()
481 if ((pspi->max_speed_hz) > PCH_MAX_BAUDRATE) in pch_spi_setup()
482 pspi->max_speed_hz = PCH_MAX_BAUDRATE; in pch_spi_setup()
484 dev_dbg(&pspi->dev, "%s MODE = %x\n", __func__, in pch_spi_setup()
485 (pspi->mode) & (SPI_CPOL | SPI_CPHA)); in pch_spi_setup()
494 struct pch_spi_data *data = spi_master_get_devdata(pspi->master); in pch_spi_transfer()
498 /* validate spi message and baud rate */ in pch_spi_transfer()
499 if (unlikely(list_empty(&pmsg->transfers) == 1)) { in pch_spi_transfer()
500 dev_err(&pspi->dev, "%s list empty\n", __func__); in pch_spi_transfer()
501 retval = -EINVAL; in pch_spi_transfer()
505 if (unlikely(pspi->max_speed_hz == 0)) { in pch_spi_transfer()
506 dev_err(&pspi->dev, "%s pch_spi_tranfer maxspeed=%d\n", in pch_spi_transfer()
507 __func__, pspi->max_speed_hz); in pch_spi_transfer()
508 retval = -EINVAL; in pch_spi_transfer()
512 dev_dbg(&pspi->dev, "%s Transfer List not empty. " in pch_spi_transfer()
515 spin_lock_irqsave(&data->lock, flags); in pch_spi_transfer()
516 /* validate Tx/Rx buffers and Transfer length */ in pch_spi_transfer()
517 list_for_each_entry(transfer, &pmsg->transfers, transfer_list) { in pch_spi_transfer()
518 if (!transfer->tx_buf && !transfer->rx_buf) { in pch_spi_transfer()
519 dev_err(&pspi->dev, in pch_spi_transfer()
520 "%s Tx and Rx buffer NULL\n", __func__); in pch_spi_transfer()
521 retval = -EINVAL; in pch_spi_transfer()
525 if (!transfer->len) { in pch_spi_transfer()
526 dev_err(&pspi->dev, "%s Transfer length invalid\n", in pch_spi_transfer()
528 retval = -EINVAL; in pch_spi_transfer()
532 dev_dbg(&pspi->dev, "%s Tx/Rx buffer valid. Transfer length" in pch_spi_transfer()
536 if (transfer->speed_hz > PCH_MAX_BAUDRATE) in pch_spi_transfer()
537 transfer->speed_hz = PCH_MAX_BAUDRATE; in pch_spi_transfer()
540 if (transfer->bits_per_word) { in pch_spi_transfer()
541 if ((transfer->bits_per_word != 8) in pch_spi_transfer()
542 && (transfer->bits_per_word != 16)) { in pch_spi_transfer()
543 retval = -EINVAL; in pch_spi_transfer()
544 dev_err(&pspi->dev, in pch_spi_transfer()
550 spin_unlock_irqrestore(&data->lock, flags); in pch_spi_transfer()
553 if (data->status == STATUS_EXITING) { in pch_spi_transfer()
554 dev_err(&pspi->dev, "%s status = STATUS_EXITING.\n", __func__); in pch_spi_transfer()
555 retval = -ESHUTDOWN; in pch_spi_transfer()
559 /* If suspended ,return -EINVAL */ in pch_spi_transfer()
560 if (data->board_dat->suspend_sts) { in pch_spi_transfer()
561 dev_err(&pspi->dev, "%s suspend; returning EINVAL\n", __func__); in pch_spi_transfer()
562 retval = -EINVAL; in pch_spi_transfer()
567 pmsg->actual_length = 0; in pch_spi_transfer()
568 dev_dbg(&pspi->dev, "%s - pmsg->status =%d\n", __func__, pmsg->status); in pch_spi_transfer()
570 pmsg->status = -EINPROGRESS; in pch_spi_transfer()
571 spin_lock_irqsave(&data->lock, flags); in pch_spi_transfer()
573 list_add_tail(&pmsg->queue, &data->queue); in pch_spi_transfer()
574 spin_unlock_irqrestore(&data->lock, flags); in pch_spi_transfer()
576 dev_dbg(&pspi->dev, "%s - Invoked list_add_tail\n", __func__); in pch_spi_transfer()
579 queue_work(data->wk, &data->work); in pch_spi_transfer()
580 dev_dbg(&pspi->dev, "%s - Invoked queue work\n", __func__); in pch_spi_transfer()
585 dev_dbg(&pspi->dev, "%s RETURN=%d\n", __func__, retval); in pch_spi_transfer()
588 dev_dbg(&pspi->dev, "%s RETURN=%d\n", __func__, retval); in pch_spi_transfer()
589 spin_unlock_irqrestore(&data->lock, flags); in pch_spi_transfer()
596 if (data->current_chip != NULL) { in pch_spi_select_chip()
597 if (pspi->chip_select != data->n_curnt_chip) { in pch_spi_select_chip()
598 dev_dbg(&pspi->dev, "%s : different slave\n", __func__); in pch_spi_select_chip()
599 data->current_chip = NULL; in pch_spi_select_chip()
603 data->current_chip = pspi; in pch_spi_select_chip()
605 data->n_curnt_chip = data->current_chip->chip_select; in pch_spi_select_chip()
607 dev_dbg(&pspi->dev, "%s :Invoking pch_spi_setup_transfer\n", __func__); in pch_spi_select_chip()
621 if (data->cur_trans->speed_hz) { in pch_spi_set_tx()
622 dev_dbg(&data->master->dev, "%s:setting baud rate\n", __func__); in pch_spi_set_tx()
623 pch_spi_set_baud_rate(data->master, data->cur_trans->speed_hz); in pch_spi_set_tx()
627 if (data->cur_trans->bits_per_word && in pch_spi_set_tx()
628 (data->current_msg->spi->bits_per_word != data->cur_trans->bits_per_word)) { in pch_spi_set_tx()
629 dev_dbg(&data->master->dev, "%s:set bits per word\n", __func__); in pch_spi_set_tx()
630 pch_spi_set_bits_per_word(data->master, in pch_spi_set_tx()
631 data->cur_trans->bits_per_word); in pch_spi_set_tx()
632 *bpw = data->cur_trans->bits_per_word; in pch_spi_set_tx()
634 *bpw = data->current_msg->spi->bits_per_word; in pch_spi_set_tx()
637 /* reset Tx/Rx index */ in pch_spi_set_tx()
638 data->tx_index = 0; in pch_spi_set_tx()
639 data->rx_index = 0; in pch_spi_set_tx()
641 data->bpw_len = data->cur_trans->len / (*bpw / 8); in pch_spi_set_tx()
644 size = data->cur_trans->len * sizeof(*data->pkt_tx_buff); in pch_spi_set_tx()
647 data->pkt_tx_buff = kzalloc(size, GFP_KERNEL); in pch_spi_set_tx()
648 if (data->pkt_tx_buff != NULL) { in pch_spi_set_tx()
649 data->pkt_rx_buff = kzalloc(size, GFP_KERNEL); in pch_spi_set_tx()
650 if (!data->pkt_rx_buff) in pch_spi_set_tx()
651 kfree(data->pkt_tx_buff); in pch_spi_set_tx()
654 if (!data->pkt_rx_buff) { in pch_spi_set_tx()
655 /* flush queue and set status of all transfers to -ENOMEM */ in pch_spi_set_tx()
656 dev_err(&data->master->dev, "%s :kzalloc failed\n", __func__); in pch_spi_set_tx()
657 list_for_each_entry(pmsg, data->queue.next, queue) { in pch_spi_set_tx()
658 pmsg->status = -ENOMEM; in pch_spi_set_tx()
660 if (pmsg->complete != 0) in pch_spi_set_tx()
661 pmsg->complete(pmsg->context); in pch_spi_set_tx()
664 list_del_init(&pmsg->queue); in pch_spi_set_tx()
670 if (data->cur_trans->tx_buf != NULL) { in pch_spi_set_tx()
672 tx_buf = data->cur_trans->tx_buf; in pch_spi_set_tx()
673 for (j = 0; j < data->bpw_len; j++) in pch_spi_set_tx()
674 data->pkt_tx_buff[j] = *tx_buf++; in pch_spi_set_tx()
676 tx_sbuf = data->cur_trans->tx_buf; in pch_spi_set_tx()
677 for (j = 0; j < data->bpw_len; j++) in pch_spi_set_tx()
678 data->pkt_tx_buff[j] = *tx_sbuf++; in pch_spi_set_tx()
683 n_writes = data->bpw_len; in pch_spi_set_tx()
687 dev_dbg(&data->master->dev, "\n%s:Pulling down SSN low - writing " in pch_spi_set_tx()
689 pch_spi_writereg(data->master, PCH_SSNXCR, SSN_LOW); in pch_spi_set_tx()
692 pch_spi_writereg(data->master, PCH_SPDWR, data->pkt_tx_buff[j]); in pch_spi_set_tx()
695 data->tx_index = j; in pch_spi_set_tx()
698 data->transfer_complete = false; in pch_spi_set_tx()
699 data->transfer_active = true; in pch_spi_set_tx()
705 dev_dbg(&data->master->dev, "%s called\n", __func__); in pch_spi_nomore_transfer()
707 * [To the spi core..indicating end of transfer] */ in pch_spi_nomore_transfer()
708 data->current_msg->status = 0; in pch_spi_nomore_transfer()
710 if (data->current_msg->complete != 0) { in pch_spi_nomore_transfer()
711 dev_dbg(&data->master->dev, in pch_spi_nomore_transfer()
712 "%s:Invoking callback of SPI core\n", __func__); in pch_spi_nomore_transfer()
713 data->current_msg->complete(data->current_msg->context); in pch_spi_nomore_transfer()
717 data->bcurrent_msg_processing = false; in pch_spi_nomore_transfer()
719 dev_dbg(&data->master->dev, in pch_spi_nomore_transfer()
720 "%s:data->bcurrent_msg_processing = false\n", __func__); in pch_spi_nomore_transfer()
722 data->current_msg = NULL; in pch_spi_nomore_transfer()
723 data->cur_trans = NULL; in pch_spi_nomore_transfer()
727 if ((list_empty(&data->queue) == 0) && in pch_spi_nomore_transfer()
728 (!data->board_dat->suspend_sts) && in pch_spi_nomore_transfer()
729 (data->status != STATUS_EXITING)) { in pch_spi_nomore_transfer()
734 dev_dbg(&data->master->dev, "%s:Invoke queue_work\n", __func__); in pch_spi_nomore_transfer()
735 queue_work(data->wk, &data->work); in pch_spi_nomore_transfer()
736 } else if (data->board_dat->suspend_sts || in pch_spi_nomore_transfer()
737 data->status == STATUS_EXITING) { in pch_spi_nomore_transfer()
738 dev_dbg(&data->master->dev, in pch_spi_nomore_transfer()
741 list_for_each_entry(pmsg, data->queue.next, queue) { in pch_spi_nomore_transfer()
742 pmsg->status = -EIO; in pch_spi_nomore_transfer()
744 if (pmsg->complete) in pch_spi_nomore_transfer()
745 pmsg->complete(pmsg->context); in pch_spi_nomore_transfer()
748 list_del_init(&pmsg->queue); in pch_spi_nomore_transfer()
755 /* enable interrupts, set threshold, enable SPI */ in pch_spi_set_ir()
756 if ((data->bpw_len) > PCH_MAX_FIFO_DEPTH) in pch_spi_set_ir()
758 pch_spi_setclr_reg(data->master, PCH_SPCR, in pch_spi_set_ir()
765 pch_spi_setclr_reg(data->master, PCH_SPCR, in pch_spi_set_ir()
773 dev_dbg(&data->master->dev, in pch_spi_set_ir()
776 wait_event_interruptible(data->wait, data->transfer_complete); in pch_spi_set_ir()
779 pch_spi_writereg(data->master, PCH_SPSR, in pch_spi_set_ir()
780 pch_spi_readreg(data->master, PCH_SPSR)); in pch_spi_set_ir()
781 /* Disable interrupts and SPI transfer */ in pch_spi_set_ir()
782 pch_spi_setclr_reg(data->master, PCH_SPCR, 0, PCH_ALL | SPCR_SPE_BIT); in pch_spi_set_ir()
784 pch_spi_clear_fifo(data->master); in pch_spi_set_ir()
793 /* copy Rx Data */ in pch_spi_copy_rx_data()
794 if (!data->cur_trans->rx_buf) in pch_spi_copy_rx_data()
798 rx_buf = data->cur_trans->rx_buf; in pch_spi_copy_rx_data()
799 for (j = 0; j < data->bpw_len; j++) in pch_spi_copy_rx_data()
800 *rx_buf++ = data->pkt_rx_buff[j] & 0xFF; in pch_spi_copy_rx_data()
802 rx_sbuf = data->cur_trans->rx_buf; in pch_spi_copy_rx_data()
803 for (j = 0; j < data->bpw_len; j++) in pch_spi_copy_rx_data()
804 *rx_sbuf++ = data->pkt_rx_buff[j]; in pch_spi_copy_rx_data()
816 /* copy Rx Data */ in pch_spi_copy_rx_data_for_dma()
817 if (!data->cur_trans->rx_buf) in pch_spi_copy_rx_data_for_dma()
821 rx_buf = data->cur_trans->rx_buf; in pch_spi_copy_rx_data_for_dma()
822 rx_dma_buf = data->dma.rx_buf_virt; in pch_spi_copy_rx_data_for_dma()
823 for (j = 0; j < data->bpw_len; j++) in pch_spi_copy_rx_data_for_dma()
826 rx_sbuf = data->cur_trans->rx_buf; in pch_spi_copy_rx_data_for_dma()
827 rx_dma_sbuf = data->dma.rx_buf_virt; in pch_spi_copy_rx_data_for_dma()
828 for (j = 0; j < data->bpw_len; j++) in pch_spi_copy_rx_data_for_dma()
839 dma = &data->dma; in pch_spi_start_transfer()
841 spin_lock_irqsave(&data->lock, flags); in pch_spi_start_transfer()
843 /* disable interrupts, SPI set enable */ in pch_spi_start_transfer()
844 pch_spi_setclr_reg(data->master, PCH_SPCR, SPCR_SPE_BIT, PCH_ALL); in pch_spi_start_transfer()
846 spin_unlock_irqrestore(&data->lock, flags); in pch_spi_start_transfer()
850 dev_dbg(&data->master->dev, in pch_spi_start_transfer()
852 rtn = wait_event_interruptible_timeout(data->wait, in pch_spi_start_transfer()
853 data->transfer_complete, in pch_spi_start_transfer()
856 dma_sync_sg_for_cpu(&data->master->dev, dma->sg_rx_p, dma->nent, in pch_spi_start_transfer()
859 dma_sync_sg_for_cpu(&data->master->dev, dma->sg_tx_p, dma->nent, in pch_spi_start_transfer()
861 memset(data->dma.tx_buf_virt, 0, PAGE_SIZE); in pch_spi_start_transfer()
863 async_tx_ack(dma->desc_rx); in pch_spi_start_transfer()
864 async_tx_ack(dma->desc_tx); in pch_spi_start_transfer()
865 kfree(dma->sg_tx_p); in pch_spi_start_transfer()
866 kfree(dma->sg_rx_p); in pch_spi_start_transfer()
868 spin_lock_irqsave(&data->lock, flags); in pch_spi_start_transfer()
870 /* clear fifo threshold, disable interrupts, disable SPI transfer */ in pch_spi_start_transfer()
871 pch_spi_setclr_reg(data->master, PCH_SPCR, 0, in pch_spi_start_transfer()
875 pch_spi_writereg(data->master, PCH_SPSR, in pch_spi_start_transfer()
876 pch_spi_readreg(data->master, PCH_SPSR)); in pch_spi_start_transfer()
878 pch_spi_clear_fifo(data->master); in pch_spi_start_transfer()
880 spin_unlock_irqrestore(&data->lock, flags); in pch_spi_start_transfer()
890 data->transfer_complete = true; in pch_dma_rx_complete()
891 wake_up_interruptible(&data->wait); in pch_dma_rx_complete()
898 if ((chan->chan_id == param->chan_id) && in pch_spi_filter()
899 (param->dma_dev == chan->device->dev)) { in pch_spi_filter()
900 chan->private = param; in pch_spi_filter()
914 unsigned int width; in pch_spi_request_dma() local
917 width = PCH_DMA_WIDTH_1_BYTE; in pch_spi_request_dma()
919 width = PCH_DMA_WIDTH_2_BYTES; in pch_spi_request_dma()
921 dma = &data->dma; in pch_spi_request_dma()
929 param = &dma->param_tx; in pch_spi_request_dma()
930 param->dma_dev = &dma_dev->dev; in pch_spi_request_dma()
931 param->chan_id = data->master->bus_num * 2; /* Tx = 0, 2 */ in pch_spi_request_dma()
932 param->tx_reg = data->io_base_addr + PCH_SPDWR; in pch_spi_request_dma()
933 param->width = width; in pch_spi_request_dma()
936 dev_err(&data->master->dev, in pch_spi_request_dma()
938 data->use_dma = 0; in pch_spi_request_dma()
941 dma->chan_tx = chan; in pch_spi_request_dma()
943 /* Set Rx DMA */ in pch_spi_request_dma()
944 param = &dma->param_rx; in pch_spi_request_dma()
945 param->dma_dev = &dma_dev->dev; in pch_spi_request_dma()
946 param->chan_id = data->master->bus_num * 2 + 1; /* Rx = Tx + 1 */ in pch_spi_request_dma()
947 param->rx_reg = data->io_base_addr + PCH_SPDRR; in pch_spi_request_dma()
948 param->width = width; in pch_spi_request_dma()
951 dev_err(&data->master->dev, in pch_spi_request_dma()
952 "ERROR: dma_request_channel FAILS(Rx)\n"); in pch_spi_request_dma()
953 dma_release_channel(dma->chan_tx); in pch_spi_request_dma()
954 dma->chan_tx = NULL; in pch_spi_request_dma()
955 data->use_dma = 0; in pch_spi_request_dma()
958 dma->chan_rx = chan; in pch_spi_request_dma()
965 dma = &data->dma; in pch_spi_release_dma()
966 if (dma->chan_tx) { in pch_spi_release_dma()
967 dma_release_channel(dma->chan_tx); in pch_spi_release_dma()
968 dma->chan_tx = NULL; in pch_spi_release_dma()
970 if (dma->chan_rx) { in pch_spi_release_dma()
971 dma_release_channel(dma->chan_rx); in pch_spi_release_dma()
972 dma->chan_rx = NULL; in pch_spi_release_dma()
993 dma = &data->dma; in pch_spi_handle_dma()
996 if (data->cur_trans->speed_hz) { in pch_spi_handle_dma()
997 dev_dbg(&data->master->dev, "%s:setting baud rate\n", __func__); in pch_spi_handle_dma()
998 spin_lock_irqsave(&data->lock, flags); in pch_spi_handle_dma()
999 pch_spi_set_baud_rate(data->master, data->cur_trans->speed_hz); in pch_spi_handle_dma()
1000 spin_unlock_irqrestore(&data->lock, flags); in pch_spi_handle_dma()
1004 if (data->cur_trans->bits_per_word && in pch_spi_handle_dma()
1005 (data->current_msg->spi->bits_per_word != in pch_spi_handle_dma()
1006 data->cur_trans->bits_per_word)) { in pch_spi_handle_dma()
1007 dev_dbg(&data->master->dev, "%s:set bits per word\n", __func__); in pch_spi_handle_dma()
1008 spin_lock_irqsave(&data->lock, flags); in pch_spi_handle_dma()
1009 pch_spi_set_bits_per_word(data->master, in pch_spi_handle_dma()
1010 data->cur_trans->bits_per_word); in pch_spi_handle_dma()
1011 spin_unlock_irqrestore(&data->lock, flags); in pch_spi_handle_dma()
1012 *bpw = data->cur_trans->bits_per_word; in pch_spi_handle_dma()
1014 *bpw = data->current_msg->spi->bits_per_word; in pch_spi_handle_dma()
1016 data->bpw_len = data->cur_trans->len / (*bpw / 8); in pch_spi_handle_dma()
1019 if (data->cur_trans->tx_buf != NULL) { in pch_spi_handle_dma()
1021 tx_buf = data->cur_trans->tx_buf; in pch_spi_handle_dma()
1022 tx_dma_buf = dma->tx_buf_virt; in pch_spi_handle_dma()
1023 for (i = 0; i < data->bpw_len; i++) in pch_spi_handle_dma()
1026 tx_sbuf = data->cur_trans->tx_buf; in pch_spi_handle_dma()
1027 tx_dma_sbuf = dma->tx_buf_virt; in pch_spi_handle_dma()
1028 for (i = 0; i < data->bpw_len; i++) in pch_spi_handle_dma()
1032 if (data->bpw_len > PCH_DMA_TRANS_SIZE) { in pch_spi_handle_dma()
1033 num = data->bpw_len / PCH_DMA_TRANS_SIZE + 1; in pch_spi_handle_dma()
1035 rem = data->bpw_len % PCH_DMA_TRANS_SIZE; in pch_spi_handle_dma()
1038 size = data->bpw_len; in pch_spi_handle_dma()
1039 rem = data->bpw_len; in pch_spi_handle_dma()
1041 dev_dbg(&data->master->dev, "%s num=%d size=%d rem=%d\n", in pch_spi_handle_dma()
1043 spin_lock_irqsave(&data->lock, flags); in pch_spi_handle_dma()
1046 pch_spi_setclr_reg(data->master, PCH_SPCR, in pch_spi_handle_dma()
1047 ((size - 1) << SPCR_RFIC_FIELD) | in pch_spi_handle_dma()
1051 spin_unlock_irqrestore(&data->lock, flags); in pch_spi_handle_dma()
1053 /* RX */ in pch_spi_handle_dma()
1054 dma->sg_rx_p = kzalloc(sizeof(struct scatterlist)*num, GFP_ATOMIC); in pch_spi_handle_dma()
1055 sg_init_table(dma->sg_rx_p, num); /* Initialize SG table */ in pch_spi_handle_dma()
1057 sg = dma->sg_rx_p; in pch_spi_handle_dma()
1059 if (i == (num - 2)) { in pch_spi_handle_dma()
1060 sg->offset = size * i; in pch_spi_handle_dma()
1061 sg->offset = sg->offset * (*bpw / 8); in pch_spi_handle_dma()
1062 sg_set_page(sg, virt_to_page(dma->rx_buf_virt), rem, in pch_spi_handle_dma()
1063 sg->offset); in pch_spi_handle_dma()
1065 } else if (i == (num - 1)) { in pch_spi_handle_dma()
1066 sg->offset = size * (i - 1) + rem; in pch_spi_handle_dma()
1067 sg->offset = sg->offset * (*bpw / 8); in pch_spi_handle_dma()
1068 sg_set_page(sg, virt_to_page(dma->rx_buf_virt), size, in pch_spi_handle_dma()
1069 sg->offset); in pch_spi_handle_dma()
1072 sg->offset = size * i; in pch_spi_handle_dma()
1073 sg->offset = sg->offset * (*bpw / 8); in pch_spi_handle_dma()
1074 sg_set_page(sg, virt_to_page(dma->rx_buf_virt), size, in pch_spi_handle_dma()
1075 sg->offset); in pch_spi_handle_dma()
1078 sg_dma_address(sg) = dma->rx_buf_dma + sg->offset; in pch_spi_handle_dma()
1080 sg = dma->sg_rx_p; in pch_spi_handle_dma()
1081 desc_rx = dma->chan_rx->device->device_prep_slave_sg(dma->chan_rx, sg, in pch_spi_handle_dma()
1085 dev_err(&data->master->dev, "%s:device_prep_slave_sg Failed\n", in pch_spi_handle_dma()
1089 dma_sync_sg_for_device(&data->master->dev, sg, num, DMA_FROM_DEVICE); in pch_spi_handle_dma()
1090 desc_rx->callback = pch_dma_rx_complete; in pch_spi_handle_dma()
1091 desc_rx->callback_param = data; in pch_spi_handle_dma()
1092 dma->nent = num; in pch_spi_handle_dma()
1093 dma->desc_rx = desc_rx; in pch_spi_handle_dma()
1096 if (data->bpw_len > PCH_DMA_TRANS_SIZE) { in pch_spi_handle_dma()
1097 num = data->bpw_len / PCH_DMA_TRANS_SIZE; in pch_spi_handle_dma()
1102 size = data->bpw_len; in pch_spi_handle_dma()
1103 rem = data->bpw_len; in pch_spi_handle_dma()
1106 dma->sg_tx_p = kzalloc(sizeof(struct scatterlist)*num, GFP_ATOMIC); in pch_spi_handle_dma()
1107 sg_init_table(dma->sg_tx_p, num); /* Initialize SG table */ in pch_spi_handle_dma()
1109 sg = dma->sg_tx_p; in pch_spi_handle_dma()
1112 sg->offset = 0; in pch_spi_handle_dma()
1113 sg_set_page(sg, virt_to_page(dma->tx_buf_virt), rem, in pch_spi_handle_dma()
1114 sg->offset); in pch_spi_handle_dma()
1117 sg->offset = rem + size * (i - 1); in pch_spi_handle_dma()
1118 sg->offset = sg->offset * (*bpw / 8); in pch_spi_handle_dma()
1119 sg_set_page(sg, virt_to_page(dma->tx_buf_virt), size, in pch_spi_handle_dma()
1120 sg->offset); in pch_spi_handle_dma()
1123 sg_dma_address(sg) = dma->tx_buf_dma + sg->offset; in pch_spi_handle_dma()
1125 sg = dma->sg_tx_p; in pch_spi_handle_dma()
1126 desc_tx = dma->chan_tx->device->device_prep_slave_sg(dma->chan_tx, in pch_spi_handle_dma()
1130 dev_err(&data->master->dev, "%s:device_prep_slave_sg Failed\n", in pch_spi_handle_dma()
1134 dma_sync_sg_for_device(&data->master->dev, sg, num, DMA_TO_DEVICE); in pch_spi_handle_dma()
1135 desc_tx->callback = NULL; in pch_spi_handle_dma()
1136 desc_tx->callback_param = data; in pch_spi_handle_dma()
1137 dma->nent = num; in pch_spi_handle_dma()
1138 dma->desc_tx = desc_tx; in pch_spi_handle_dma()
1140 dev_dbg(&data->master->dev, "\n%s:Pulling down SSN low - writing " in pch_spi_handle_dma()
1143 spin_lock_irqsave(&data->lock, flags); in pch_spi_handle_dma()
1144 pch_spi_writereg(data->master, PCH_SSNXCR, SSN_LOW); in pch_spi_handle_dma()
1145 desc_rx->tx_submit(desc_rx); in pch_spi_handle_dma()
1146 desc_tx->tx_submit(desc_tx); in pch_spi_handle_dma()
1147 spin_unlock_irqrestore(&data->lock, flags); in pch_spi_handle_dma()
1150 data->transfer_complete = false; in pch_spi_handle_dma()
1160 dev_dbg(&data->master->dev, "%s data initialized\n", __func__); in pch_spi_process_messages()
1162 spin_lock(&data->lock); in pch_spi_process_messages()
1164 if (data->board_dat->suspend_sts || (data->status == STATUS_EXITING)) { in pch_spi_process_messages()
1165 dev_dbg(&data->master->dev, "%s suspend/remove initiated," in pch_spi_process_messages()
1167 list_for_each_entry(pmsg, data->queue.next, queue) { in pch_spi_process_messages()
1168 pmsg->status = -EIO; in pch_spi_process_messages()
1170 if (pmsg->complete != 0) { in pch_spi_process_messages()
1171 spin_unlock(&data->lock); in pch_spi_process_messages()
1172 pmsg->complete(pmsg->context); in pch_spi_process_messages()
1173 spin_lock(&data->lock); in pch_spi_process_messages()
1177 list_del_init(&pmsg->queue); in pch_spi_process_messages()
1180 spin_unlock(&data->lock); in pch_spi_process_messages()
1184 data->bcurrent_msg_processing = true; in pch_spi_process_messages()
1185 dev_dbg(&data->master->dev, in pch_spi_process_messages()
1186 "%s Set data->bcurrent_msg_processing= true\n", __func__); in pch_spi_process_messages()
1189 data->current_msg = list_entry(data->queue.next, struct spi_message, in pch_spi_process_messages()
1192 list_del_init(&data->current_msg->queue); in pch_spi_process_messages()
1194 data->current_msg->status = 0; in pch_spi_process_messages()
1196 pch_spi_select_chip(data, data->current_msg->spi); in pch_spi_process_messages()
1198 spin_unlock(&data->lock); in pch_spi_process_messages()
1200 if (data->use_dma) in pch_spi_process_messages()
1202 data->current_msg->spi->bits_per_word); in pch_spi_process_messages()
1203 pch_spi_writereg(data->master, PCH_SSNXCR, SSN_NO_CONTROL); in pch_spi_process_messages()
1208 spin_lock(&data->lock); in pch_spi_process_messages()
1209 if (data->cur_trans == NULL) { in pch_spi_process_messages()
1210 data->cur_trans = in pch_spi_process_messages()
1211 list_entry(data->current_msg->transfers.next, in pch_spi_process_messages()
1213 dev_dbg(&data->master->dev, "%s " in pch_spi_process_messages()
1216 data->cur_trans = in pch_spi_process_messages()
1217 list_entry(data->cur_trans->transfer_list.next, in pch_spi_process_messages()
1219 dev_dbg(&data->master->dev, "%s " in pch_spi_process_messages()
1222 spin_unlock(&data->lock); in pch_spi_process_messages()
1224 if (data->use_dma) { in pch_spi_process_messages()
1233 kfree(data->pkt_rx_buff); in pch_spi_process_messages()
1234 data->pkt_rx_buff = NULL; in pch_spi_process_messages()
1235 kfree(data->pkt_tx_buff); in pch_spi_process_messages()
1236 data->pkt_tx_buff = NULL; in pch_spi_process_messages()
1239 data->current_msg->actual_length += data->cur_trans->len; in pch_spi_process_messages()
1241 dev_dbg(&data->master->dev, in pch_spi_process_messages()
1242 "%s:data->current_msg->actual_length=%d\n", in pch_spi_process_messages()
1243 __func__, data->current_msg->actual_length); in pch_spi_process_messages()
1246 if (data->cur_trans->delay_usecs) { in pch_spi_process_messages()
1247 dev_dbg(&data->master->dev, "%s:" in pch_spi_process_messages()
1249 data->cur_trans->delay_usecs); in pch_spi_process_messages()
1250 udelay(data->cur_trans->delay_usecs); in pch_spi_process_messages()
1253 spin_lock(&data->lock); in pch_spi_process_messages()
1256 if ((data->cur_trans->transfer_list.next) == in pch_spi_process_messages()
1257 &(data->current_msg->transfers)) { in pch_spi_process_messages()
1261 spin_unlock(&data->lock); in pch_spi_process_messages()
1263 } while (data->cur_trans != NULL); in pch_spi_process_messages()
1266 pch_spi_writereg(data->master, PCH_SSNXCR, SSN_HIGH); in pch_spi_process_messages()
1267 if (data->use_dma) in pch_spi_process_messages()
1274 dev_dbg(&board_dat->pdev->dev, "%s ENTRY\n", __func__); in pch_spi_free_resources()
1277 if (data->wk != NULL) { in pch_spi_free_resources()
1278 destroy_workqueue(data->wk); in pch_spi_free_resources()
1279 data->wk = NULL; in pch_spi_free_resources()
1280 dev_dbg(&board_dat->pdev->dev, in pch_spi_free_resources()
1291 dev_dbg(&board_dat->pdev->dev, "%s ENTRY\n", __func__); in pch_spi_get_resources()
1294 data->wk = create_singlethread_workqueue(KBUILD_MODNAME); in pch_spi_get_resources()
1295 if (!data->wk) { in pch_spi_get_resources()
1296 dev_err(&board_dat->pdev->dev, in pch_spi_get_resources()
1298 retval = -EBUSY; in pch_spi_get_resources()
1302 /* reset PCH SPI h/w */ in pch_spi_get_resources()
1303 pch_spi_reset(data->master); in pch_spi_get_resources()
1304 dev_dbg(&board_dat->pdev->dev, in pch_spi_get_resources()
1307 dev_dbg(&board_dat->pdev->dev, "%s data->irq_reg_sts=true\n", __func__); in pch_spi_get_resources()
1311 dev_err(&board_dat->pdev->dev, in pch_spi_get_resources()
1316 dev_dbg(&board_dat->pdev->dev, "%s Return=%d\n", __func__, retval); in pch_spi_get_resources()
1326 dma = &data->dma; in pch_free_dma_buf()
1327 if (dma->tx_buf_dma) in pch_free_dma_buf()
1328 dma_free_coherent(&board_dat->pdev->dev, PCH_BUF_SIZE, in pch_free_dma_buf()
1329 dma->tx_buf_virt, dma->tx_buf_dma); in pch_free_dma_buf()
1330 if (dma->rx_buf_dma) in pch_free_dma_buf()
1331 dma_free_coherent(&board_dat->pdev->dev, PCH_BUF_SIZE, in pch_free_dma_buf()
1332 dma->rx_buf_virt, dma->rx_buf_dma); in pch_free_dma_buf()
1341 dma = &data->dma; in pch_alloc_dma_buf()
1343 dma->tx_buf_virt = dma_alloc_coherent(&board_dat->pdev->dev, in pch_alloc_dma_buf()
1344 PCH_BUF_SIZE, &dma->tx_buf_dma, GFP_KERNEL); in pch_alloc_dma_buf()
1345 /* Get Consistent memory for Rx DMA */ in pch_alloc_dma_buf()
1346 dma->rx_buf_virt = dma_alloc_coherent(&board_dat->pdev->dev, in pch_alloc_dma_buf()
1347 PCH_BUF_SIZE, &dma->rx_buf_dma, GFP_KERNEL); in pch_alloc_dma_buf()
1354 struct pch_spi_board_data *board_dat = dev_get_platdata(&plat_dev->dev); in pch_spi_pd_probe()
1357 dev_dbg(&plat_dev->dev, "%s:debug\n", __func__); in pch_spi_pd_probe()
1359 master = spi_alloc_master(&board_dat->pdev->dev, in pch_spi_pd_probe()
1362 dev_err(&plat_dev->dev, "spi_alloc_master[%d] failed.\n", in pch_spi_pd_probe()
1363 plat_dev->id); in pch_spi_pd_probe()
1364 return -ENOMEM; in pch_spi_pd_probe()
1368 data->master = master; in pch_spi_pd_probe()
1373 data->io_base_addr = pci_resource_start(board_dat->pdev, 1) + in pch_spi_pd_probe()
1374 PCH_ADDRESS_SIZE * plat_dev->id; in pch_spi_pd_probe()
1375 data->io_remap_addr = pci_iomap(board_dat->pdev, 1, 0) + in pch_spi_pd_probe()
1376 PCH_ADDRESS_SIZE * plat_dev->id; in pch_spi_pd_probe()
1377 if (!data->io_remap_addr) { in pch_spi_pd_probe()
1378 dev_err(&plat_dev->dev, "%s pci_iomap failed\n", __func__); in pch_spi_pd_probe()
1379 ret = -ENOMEM; in pch_spi_pd_probe()
1383 dev_dbg(&plat_dev->dev, "[ch%d] remap_addr=%p\n", in pch_spi_pd_probe()
1384 plat_dev->id, data->io_remap_addr); in pch_spi_pd_probe()
1386 /* initialize members of SPI master */ in pch_spi_pd_probe()
1387 master->bus_num = -1; in pch_spi_pd_probe()
1388 master->num_chipselect = PCH_MAX_CS; in pch_spi_pd_probe()
1389 master->setup = pch_spi_setup; in pch_spi_pd_probe()
1390 master->transfer = pch_spi_transfer; in pch_spi_pd_probe()
1392 data->board_dat = board_dat; in pch_spi_pd_probe()
1393 data->plat_dev = plat_dev; in pch_spi_pd_probe()
1394 data->n_curnt_chip = 255; in pch_spi_pd_probe()
1395 data->status = STATUS_RUNNING; in pch_spi_pd_probe()
1396 data->ch = plat_dev->id; in pch_spi_pd_probe()
1397 data->use_dma = use_dma; in pch_spi_pd_probe()
1399 INIT_LIST_HEAD(&data->queue); in pch_spi_pd_probe()
1400 spin_lock_init(&data->lock); in pch_spi_pd_probe()
1401 INIT_WORK(&data->work, pch_spi_process_messages); in pch_spi_pd_probe()
1402 init_waitqueue_head(&data->wait); in pch_spi_pd_probe()
1406 dev_err(&plat_dev->dev, "%s fail(retval=%d)\n", __func__, ret); in pch_spi_pd_probe()
1410 ret = request_irq(board_dat->pdev->irq, pch_spi_handler, in pch_spi_pd_probe()
1413 dev_err(&plat_dev->dev, in pch_spi_pd_probe()
1417 data->irq_reg_sts = true; in pch_spi_pd_probe()
1423 dev_err(&plat_dev->dev, in pch_spi_pd_probe()
1429 dev_info(&plat_dev->dev, "Use DMA for data transfers\n"); in pch_spi_pd_probe()
1436 free_irq(board_dat->pdev->irq, board_dat); in pch_spi_pd_probe()
1440 pci_iounmap(board_dat->pdev, data->io_remap_addr); in pch_spi_pd_probe()
1449 struct pch_spi_board_data *board_dat = dev_get_platdata(&plat_dev->dev); in pch_spi_pd_remove()
1454 dev_dbg(&plat_dev->dev, "%s:[ch%d] irq=%d\n", in pch_spi_pd_remove()
1455 __func__, plat_dev->id, board_dat->pdev->irq); in pch_spi_pd_remove()
1463 spin_lock_irqsave(&data->lock, flags); in pch_spi_pd_remove()
1464 data->status = STATUS_EXITING; in pch_spi_pd_remove()
1465 while ((list_empty(&data->queue) == 0) && --count) { in pch_spi_pd_remove()
1466 dev_dbg(&board_dat->pdev->dev, "%s :queue not empty\n", in pch_spi_pd_remove()
1468 spin_unlock_irqrestore(&data->lock, flags); in pch_spi_pd_remove()
1470 spin_lock_irqsave(&data->lock, flags); in pch_spi_pd_remove()
1472 spin_unlock_irqrestore(&data->lock, flags); in pch_spi_pd_remove()
1476 if (data->irq_reg_sts) { in pch_spi_pd_remove()
1478 pch_spi_setclr_reg(data->master, PCH_SPCR, 0, PCH_ALL); in pch_spi_pd_remove()
1479 data->irq_reg_sts = false; in pch_spi_pd_remove()
1480 free_irq(board_dat->pdev->irq, data); in pch_spi_pd_remove()
1483 pci_iounmap(board_dat->pdev, data->io_remap_addr); in pch_spi_pd_remove()
1484 spi_unregister_master(data->master); in pch_spi_pd_remove()
1485 spi_master_put(data->master); in pch_spi_pd_remove()
1495 struct pch_spi_board_data *board_dat = dev_get_platdata(&pd_dev->dev); in pch_spi_pd_suspend()
1498 dev_dbg(&pd_dev->dev, "%s ENTRY\n", __func__); in pch_spi_pd_suspend()
1501 dev_err(&pd_dev->dev, in pch_spi_pd_suspend()
1503 return -EFAULT; in pch_spi_pd_suspend()
1509 while ((--count) > 0) { in pch_spi_pd_suspend()
1510 if (!(data->bcurrent_msg_processing)) in pch_spi_pd_suspend()
1516 if (data->irq_reg_sts) { in pch_spi_pd_suspend()
1518 pch_spi_setclr_reg(data->master, PCH_SPCR, 0, PCH_ALL); in pch_spi_pd_suspend()
1519 pch_spi_reset(data->master); in pch_spi_pd_suspend()
1520 free_irq(board_dat->pdev->irq, data); in pch_spi_pd_suspend()
1522 data->irq_reg_sts = false; in pch_spi_pd_suspend()
1523 dev_dbg(&pd_dev->dev, in pch_spi_pd_suspend()
1532 struct pch_spi_board_data *board_dat = dev_get_platdata(&pd_dev->dev); in pch_spi_pd_resume()
1537 dev_err(&pd_dev->dev, in pch_spi_pd_resume()
1539 return -EFAULT; in pch_spi_pd_resume()
1542 if (!data->irq_reg_sts) { in pch_spi_pd_resume()
1544 retval = request_irq(board_dat->pdev->irq, pch_spi_handler, in pch_spi_pd_resume()
1547 dev_err(&pd_dev->dev, in pch_spi_pd_resume()
1552 /* reset PCH SPI h/w */ in pch_spi_pd_resume()
1553 pch_spi_reset(data->master); in pch_spi_pd_resume()
1554 pch_spi_set_master_mode(data->master); in pch_spi_pd_resume()
1555 data->irq_reg_sts = true; in pch_spi_pd_resume()
1566 .name = "pch-spi",
1586 dev_err(&pdev->dev, "%s Can't allocate pd_dev_sav\n", __func__); in pch_spi_probe()
1587 return -ENOMEM; in pch_spi_probe()
1592 dev_err(&pdev->dev, "%s Can't allocate board_dat\n", __func__); in pch_spi_probe()
1593 retval = -ENOMEM; in pch_spi_probe()
1599 dev_err(&pdev->dev, "%s request_region failed\n", __func__); in pch_spi_probe()
1603 board_dat->pdev = pdev; in pch_spi_probe()
1604 board_dat->num = id->driver_data; in pch_spi_probe()
1605 pd_dev_save->num = id->driver_data; in pch_spi_probe()
1606 pd_dev_save->board_dat = board_dat; in pch_spi_probe()
1610 dev_err(&pdev->dev, "%s pci_enable_device failed\n", __func__); in pch_spi_probe()
1614 for (i = 0; i < board_dat->num; i++) { in pch_spi_probe()
1615 pd_dev = platform_device_alloc("pch-spi", i); in pch_spi_probe()
1617 dev_err(&pdev->dev, "platform_device_alloc failed\n"); in pch_spi_probe()
1620 pd_dev_save->pd_save[i] = pd_dev; in pch_spi_probe()
1621 pd_dev->dev.parent = &pdev->dev; in pch_spi_probe()
1626 dev_err(&pdev->dev, in pch_spi_probe()
1634 dev_err(&pdev->dev, "platform_device_add failed\n"); in pch_spi_probe()
1661 dev_dbg(&pdev->dev, "%s ENTRY:pdev=%p\n", __func__, pdev); in pch_spi_remove()
1663 for (i = 0; i < pd_dev_save->num; i++) in pch_spi_remove()
1664 platform_device_unregister(pd_dev_save->pd_save[i]); in pch_spi_remove()
1668 kfree(pd_dev_save->board_dat); in pch_spi_remove()
1678 dev_dbg(&pdev->dev, "%s ENTRY\n", __func__); in pch_spi_suspend()
1680 pd_dev_save->board_dat->suspend_sts = true; in pch_spi_suspend()
1689 dev_err(&pdev->dev, "%s pci_save_state failed\n", __func__); in pch_spi_suspend()
1699 dev_dbg(&pdev->dev, "%s ENTRY\n", __func__); in pch_spi_resume()
1706 dev_err(&pdev->dev, in pch_spi_resume()
1712 pd_dev_save->board_dat->suspend_sts = false; in pch_spi_resume()
1759 MODULE_DESCRIPTION("Intel EG20T PCH/LAPIS Semiconductor ML7xxx IOH SPI Driver");