2 * SPI bus driver for the Topcliff PCH used by Intel SoCs
4 * Copyright (C) 2011 LAPIS Semiconductor Co., Ltd.
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.
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.
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>
27 #include <linux/dmaengine.h>
28 #include <linux/pch_dma.h>
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
40 #define PCH_SPSR_TFD 0x000007C0
41 #define PCH_SPSR_RFD 0x0000F800
43 #define PCH_READABLE(x) (((x) & PCH_SPSR_RFD)>>11)
44 #define PCH_WRITABLE(x) (((x) & PCH_SPSR_TFD)>>6)
46 #define PCH_RX_THOLD 7
47 #define PCH_RX_THOLD_MAX 15
49 #define PCH_TX_THOLD 2
51 #define PCH_MAX_BAUDRATE 5000000
52 #define PCH_MAX_FIFO_DEPTH 16
54 #define STATUS_RUNNING 1
55 #define STATUS_EXITING 2
56 #define PCH_SLEEP_TIME 10
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
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)
81 #define PCH_ALL (SPCR_TFIE_BIT|SPCR_RFIE_BIT|SPCR_FIE_BIT|\
82 SPCR_ORIE_BIT|SPCR_MDFIE_BIT)
84 #define SPCR_RFIC_FIELD 20
85 #define SPCR_TFIC_FIELD 16
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)
91 #define PCH_CLOCK_HZ 50000000
92 #define PCH_MAX_SPBR 1023
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
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
107 #define PCH_SPI_MAX_DEV 2
109 #define PCH_BUF_SIZE 4096
110 #define PCH_DMA_TRANS_SIZE 12
112 static int use_dma = 1;
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;
128 dma_addr_t tx_buf_dma;
129 dma_addr_t rx_buf_dma;
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
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
145 * @transfer_active: Flag showing active transfer
146 * @tx_index: Transmit data count; for bookkeeping during
148 * @rx_index: Receive data count; for bookkeeping during
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
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
158 * @cur_trans: The current transfer that this SPI driver is
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
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;
174 struct list_head queue;
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;
189 struct pch_spi_dma_ctrl dma;
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
201 struct pch_spi_board_data {
202 struct pci_dev *pdev;
207 struct pch_pd_dev_save {
209 struct platform_device *pd_save[PCH_SPI_MAX_DEV];
210 struct pch_spi_board_data *board_dat;
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, },
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.
227 static inline void pch_spi_writereg(struct spi_master *master, int idx, u32 val)
229 struct pch_spi_data *data = spi_master_get_devdata(master);
230 iowrite32(val, (data->io_remap_addr + idx));
234 * pch_spi_readreg() - Performs register reads
235 * @master: Pointer to struct spi_master.
236 * @idx: Register offset.
238 static inline u32 pch_spi_readreg(struct spi_master *master, int idx)
240 struct pch_spi_data *data = spi_master_get_devdata(master);
241 return ioread32(data->io_remap_addr + idx);
244 static inline void pch_spi_setclr_reg(struct spi_master *master, int idx,
247 u32 tmp = pch_spi_readreg(master, idx);
248 tmp = (tmp & ~clr) | set;
249 pch_spi_writereg(master, idx, tmp);
252 static void pch_spi_set_master_mode(struct spi_master *master)
254 pch_spi_setclr_reg(master, PCH_SPCR, SPCR_MSTR_BIT, 0);
258 * pch_spi_clear_fifo() - Clears the Transmit and Receive FIFOs
259 * @master: Pointer to struct spi_master.
261 static void pch_spi_clear_fifo(struct spi_master *master)
263 pch_spi_setclr_reg(master, PCH_SPCR, SPCR_FICLR_BIT, 0);
264 pch_spi_setclr_reg(master, PCH_SPCR, 0, SPCR_FICLR_BIT);
267 static void pch_spi_handler_sub(struct pch_spi_data *data, u32 reg_spsr_val,
268 void __iomem *io_remap_addr)
270 u32 n_read, tx_index, rx_index, bpw_len;
271 u16 *pkt_rx_buffer, *pkt_tx_buff;
278 spsr = io_remap_addr + PCH_SPSR;
279 iowrite32(reg_spsr_val, spsr);
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;
288 spdrr = io_remap_addr + PCH_SPDRR;
289 spdwr = io_remap_addr + PCH_SPDWR;
291 n_read = PCH_READABLE(reg_spsr_val);
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);
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 */
304 /* reset rx threshold */
305 reg_spcr_val &= ~MASK_RFIC_SPCR_BITS;
306 reg_spcr_val |= (PCH_RX_THOLD_MAX << SPCR_RFIC_FIELD);
308 iowrite32(reg_spcr_val, (io_remap_addr + PCH_SPCR));
312 data->tx_index = tx_index;
313 data->rx_index = rx_index;
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,
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);
328 dev_vdbg(&data->master->dev,
329 "%s : Transfer is not completed",
337 * pch_spi_handler() - Interrupt handler
338 * @irq: The interrupt number.
339 * @dev_id: Pointer to struct pch_spi_board_data.
341 static irqreturn_t pch_spi_handler(int irq, void *dev_id)
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;
350 if (board_dat->suspend_sts) {
351 dev_dbg(&board_dat->pdev->dev,
352 "%s returning due to suspend\n", __func__);
356 io_remap_addr = data->io_remap_addr;
357 spsr = io_remap_addr + PCH_SPSR;
359 reg_spsr_val = ioread32(spsr);
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;
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);
382 dev_dbg(&board_dat->pdev->dev, "%s EXIT return value=%d\n",
389 * pch_spi_set_baud_rate() - Sets SPBR field in SPBRR
390 * @master: Pointer to struct spi_master.
391 * @speed_hz: Baud rate.
393 static void pch_spi_set_baud_rate(struct spi_master *master, u32 speed_hz)
395 u32 n_spbr = PCH_CLOCK_HZ / (speed_hz * 2);
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;
401 pch_spi_setclr_reg(master, PCH_SPBRR, n_spbr, MASK_SPBRR_SPBR_BITS);
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.
409 static void pch_spi_set_bits_per_word(struct spi_master *master,
412 if (bits_per_word == 8)
413 pch_spi_setclr_reg(master, PCH_SPBRR, 0, SPBRR_SIZE_BIT);
415 pch_spi_setclr_reg(master, PCH_SPBRR, SPBRR_SIZE_BIT, 0);
419 * pch_spi_setup_transfer() - Configures the PCH SPI hardware for transfer
420 * @spi: Pointer to struct spi_device.
422 static void pch_spi_setup_transfer(struct spi_device *spi)
426 dev_dbg(&spi->dev, "%s SPBRR content =%x setting baud rate=%d\n",
427 __func__, pch_spi_readreg(spi->master, PCH_SPBRR),
429 pch_spi_set_baud_rate(spi->master, spi->max_speed_hz);
431 /* set bits per word */
432 pch_spi_set_bits_per_word(spi->master, spi->bits_per_word);
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));
443 /* Clear the FIFO by toggling FICLR to 1 and back to 0 */
444 pch_spi_clear_fifo(spi->master);
448 * pch_spi_reset() - Clears SPI registers
449 * @master: Pointer to struct spi_master.
451 static void pch_spi_reset(struct spi_master *master)
453 /* write 1 to reset SPI */
454 pch_spi_writereg(master, PCH_SRST, 0x1);
457 pch_spi_writereg(master, PCH_SRST, 0x0);
460 static int pch_spi_transfer(struct spi_device *pspi, struct spi_message *pmsg)
463 struct spi_transfer *transfer;
464 struct pch_spi_data *data = spi_master_get_devdata(pspi->master);
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) {
473 "%s Tx and Rx buffer NULL\n", __func__);
475 goto err_return_spinlock;
478 if (!transfer->len) {
479 dev_err(&pspi->dev, "%s Transfer length invalid\n",
482 goto err_return_spinlock;
486 "%s Tx/Rx buffer valid. Transfer length valid\n",
489 spin_unlock_irqrestore(&data->lock, flags);
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__);
498 /* If suspended ,return -EINVAL */
499 if (data->board_dat->suspend_sts) {
500 dev_err(&pspi->dev, "%s suspend; returning EINVAL\n", __func__);
505 /* set status of message */
506 pmsg->actual_length = 0;
507 dev_dbg(&pspi->dev, "%s - pmsg->status =%d\n", __func__, pmsg->status);
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);
515 dev_dbg(&pspi->dev, "%s - Invoked list_add_tail\n", __func__);
517 schedule_work(&data->work);
518 dev_dbg(&pspi->dev, "%s - Invoked queue work\n", __func__);
523 dev_dbg(&pspi->dev, "%s RETURN=%d\n", __func__, retval);
526 dev_dbg(&pspi->dev, "%s RETURN=%d\n", __func__, retval);
527 spin_unlock_irqrestore(&data->lock, flags);
531 static inline void pch_spi_select_chip(struct pch_spi_data *data,
532 struct spi_device *pspi)
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;
541 data->current_chip = pspi;
543 data->n_curnt_chip = data->current_chip->chip_select;
545 dev_dbg(&pspi->dev, "%s :Invoking pch_spi_setup_transfer\n", __func__);
546 pch_spi_setup_transfer(pspi);
549 static void pch_spi_set_tx(struct pch_spi_data *data, int *bpw)
554 struct spi_message *pmsg, *tmp;
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);
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;
572 *bpw = data->current_msg->spi->bits_per_word;
575 /* reset Tx/Rx index */
579 data->bpw_len = data->cur_trans->len / (*bpw / 8);
581 /* find alloc size */
582 size = data->cur_trans->len * sizeof(*data->pkt_tx_buff);
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);
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;
598 pmsg->complete(pmsg->context);
600 /* delete from queue */
601 list_del_init(&pmsg->queue);
607 if (data->cur_trans->tx_buf != NULL) {
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++;
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++;
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;
624 dev_dbg(&data->master->dev,
625 "\n%s:Pulling down SSN low - writing 0x2 to SSNXCR\n",
627 pch_spi_writereg(data->master, PCH_SSNXCR, SSN_LOW);
629 for (j = 0; j < n_writes; j++)
630 pch_spi_writereg(data->master, PCH_SPDWR, data->pkt_tx_buff[j]);
632 /* update tx_index */
635 /* reset transfer complete flag */
636 data->transfer_complete = false;
637 data->transfer_active = true;
640 static void pch_spi_nomore_transfer(struct pch_spi_data *data)
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;
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);
654 /* update status in global variable */
655 data->bcurrent_msg_processing = false;
657 dev_dbg(&data->master->dev,
658 "%s:data->bcurrent_msg_processing = false\n", __func__);
660 data->current_msg = NULL;
661 data->cur_trans = NULL;
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
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",
679 list_for_each_entry_safe(pmsg, tmp, data->queue.next, queue) {
683 pmsg->complete(pmsg->context);
685 /* delete from queue */
686 list_del_init(&pmsg->queue);
691 static void pch_spi_set_ir(struct pch_spi_data *data)
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);
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 |
707 MASK_RFIC_SPCR_BITS | PCH_ALL);
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__);
714 wait_event_interruptible(data->wait, data->transfer_complete);
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);
722 pch_spi_clear_fifo(data->master);
725 static void pch_spi_copy_rx_data(struct pch_spi_data *data, int bpw)
732 if (!data->cur_trans->rx_buf)
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;
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];
746 static void pch_spi_copy_rx_data_for_dma(struct pch_spi_data *data, int bpw)
751 const u8 *rx_dma_buf;
752 const u16 *rx_dma_sbuf;
755 if (!data->cur_trans->rx_buf)
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;
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;
773 static int pch_spi_start_transfer(struct pch_spi_data *data)
775 struct pch_spi_dma_ctrl *dma;
781 spin_lock_irqsave(&data->lock, flags);
783 /* disable interrupts, SPI set enable */
784 pch_spi_setclr_reg(data->master, PCH_SPCR, SPCR_SPE_BIT, PCH_ALL);
786 spin_unlock_irqrestore(&data->lock, flags);
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));
796 dev_err(&data->master->dev,
797 "%s wait-event timeout\n", __func__);
799 dma_sync_sg_for_cpu(&data->master->dev, dma->sg_rx_p, dma->nent,
802 dma_sync_sg_for_cpu(&data->master->dev, dma->sg_tx_p, dma->nent,
804 memset(data->dma.tx_buf_virt, 0, PAGE_SIZE);
806 async_tx_ack(dma->desc_rx);
807 async_tx_ack(dma->desc_tx);
811 spin_lock_irqsave(&data->lock, flags);
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 |
817 /* clear all interrupts */
818 pch_spi_writereg(data->master, PCH_SPSR,
819 pch_spi_readreg(data->master, PCH_SPSR));
821 pch_spi_clear_fifo(data->master);
823 spin_unlock_irqrestore(&data->lock, flags);
828 static void pch_dma_rx_complete(void *arg)
830 struct pch_spi_data *data = arg;
832 /* transfer is completed;inform pch_spi_process_messages_dma */
833 data->transfer_complete = true;
834 wake_up_interruptible(&data->wait);
837 static bool pch_spi_filter(struct dma_chan *chan, void *slave)
839 struct pch_dma_slave *param = slave;
841 if ((chan->chan_id == param->chan_id) &&
842 (param->dma_dev == chan->device->dev)) {
843 chan->private = param;
850 static void pch_spi_request_dma(struct pch_spi_data *data, int bpw)
853 struct dma_chan *chan;
854 struct pci_dev *dma_dev;
855 struct pch_dma_slave *param;
856 struct pch_spi_dma_ctrl *dma;
860 width = PCH_DMA_WIDTH_1_BYTE;
862 width = PCH_DMA_WIDTH_2_BYTES;
866 dma_cap_set(DMA_SLAVE, mask);
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));
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);
880 dev_err(&data->master->dev,
881 "ERROR: dma_request_channel FAILS(Tx)\n");
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);
895 dev_err(&data->master->dev,
896 "ERROR: dma_request_channel FAILS(Rx)\n");
897 dma_release_channel(dma->chan_tx);
905 static void pch_spi_release_dma(struct pch_spi_data *data)
907 struct pch_spi_dma_ctrl *dma;
911 dma_release_channel(dma->chan_tx);
915 dma_release_channel(dma->chan_rx);
920 static void pch_spi_handle_dma(struct pch_spi_data *data, int *bpw)
926 struct scatterlist *sg;
927 struct dma_async_tx_descriptor *desc_tx;
928 struct dma_async_tx_descriptor *desc_rx;
935 struct pch_spi_dma_ctrl *dma;
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);
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;
958 *bpw = data->current_msg->spi->bits_per_word;
960 data->bpw_len = data->cur_trans->len / (*bpw / 8);
962 if (data->bpw_len > PCH_BUF_SIZE) {
963 data->bpw_len = PCH_BUF_SIZE;
964 data->cur_trans->len -= PCH_BUF_SIZE;
968 if (data->cur_trans->tx_buf != NULL) {
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++;
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++;
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;
988 num = data->bpw_len / PCH_DMA_TRANS_SIZE;
989 rem = PCH_DMA_TRANS_SIZE;
991 size = PCH_DMA_TRANS_SIZE;
994 size = data->bpw_len;
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);
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);
1007 spin_unlock_irqrestore(&data->lock, flags);
1010 dma->sg_rx_p = kcalloc(num, sizeof(*dma->sg_rx_p), GFP_ATOMIC);
1014 sg_init_table(dma->sg_rx_p, num); /* Initialize SG table */
1015 /* offset, length setting */
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,
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,
1029 sg_dma_len(sg) = size;
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,
1035 sg_dma_len(sg) = size;
1037 sg_dma_address(sg) = dma->rx_buf_dma + sg->offset;
1040 desc_rx = dmaengine_prep_slave_sg(dma->chan_rx, sg,
1041 num, DMA_DEV_TO_MEM,
1042 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1044 dev_err(&data->master->dev,
1045 "%s:dmaengine_prep_slave_sg Failed\n", __func__);
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;
1052 dma->desc_rx = desc_rx;
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;
1061 num = data->bpw_len / PCH_DMA_TRANS_SIZE;
1062 rem = data->bpw_len % PCH_DMA_TRANS_SIZE +
1063 PCH_DMA_TRANS_SIZE - head;
1065 size = PCH_DMA_TRANS_SIZE;
1068 size = data->bpw_len;
1069 rem = data->bpw_len;
1073 dma->sg_tx_p = kcalloc(num, sizeof(*dma->sg_tx_p), GFP_ATOMIC);
1077 sg_init_table(dma->sg_tx_p, num); /* Initialize SG table */
1078 /* offset, length setting */
1080 for (i = 0; i < num; i++, sg++) {
1083 sg_set_page(sg, virt_to_page(dma->tx_buf_virt), size + head,
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,
1091 sg_dma_len(sg) = rem;
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,
1097 sg_dma_len(sg) = size;
1099 sg_dma_address(sg) = dma->tx_buf_dma + sg->offset;
1102 desc_tx = dmaengine_prep_slave_sg(dma->chan_tx,
1103 sg, num, DMA_MEM_TO_DEV,
1104 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1106 dev_err(&data->master->dev,
1107 "%s:dmaengine_prep_slave_sg Failed\n", __func__);
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;
1114 dma->desc_tx = desc_tx;
1116 dev_dbg(&data->master->dev, "%s:Pulling down SSN low - writing 0x2 to SSNXCR\n", __func__);
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);
1124 /* reset transfer complete flag */
1125 data->transfer_complete = false;
1128 static void pch_spi_process_messages(struct work_struct *pwork)
1130 struct spi_message *pmsg, *tmp;
1131 struct pch_spi_data *data;
1134 data = container_of(pwork, struct pch_spi_data, work);
1135 dev_dbg(&data->master->dev, "%s data initialized\n", __func__);
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;
1145 if (pmsg->complete) {
1146 spin_unlock(&data->lock);
1147 pmsg->complete(pmsg->context);
1148 spin_lock(&data->lock);
1151 /* delete from queue */
1152 list_del_init(&pmsg->queue);
1155 spin_unlock(&data->lock);
1159 data->bcurrent_msg_processing = true;
1160 dev_dbg(&data->master->dev,
1161 "%s Set data->bcurrent_msg_processing= true\n", __func__);
1163 /* Get the message from the queue and delete it from there. */
1164 data->current_msg = list_entry(data->queue.next, struct spi_message,
1167 list_del_init(&data->current_msg->queue);
1169 data->current_msg->status = 0;
1171 pch_spi_select_chip(data, data->current_msg->spi);
1173 spin_unlock(&data->lock);
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);
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) {
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",
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",
1200 spin_unlock(&data->lock);
1202 if (!data->cur_trans->len)
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) {
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;
1221 pch_spi_copy_rx_data_for_dma(data, bpw);
1223 data->cur_trans->rx_buf = save_rx_buf;
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;
1233 /* increment message count */
1234 data->cur_trans->len = data->save_total_len;
1235 data->current_msg->actual_length += data->cur_trans->len;
1237 dev_dbg(&data->master->dev,
1238 "%s:data->current_msg->actual_length=%d\n",
1239 __func__, data->current_msg->actual_length);
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);
1248 spin_lock(&data->lock);
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);
1256 spin_unlock(&data->lock);
1258 } while (data->cur_trans != NULL);
1261 pch_spi_writereg(data->master, PCH_SSNXCR, SSN_HIGH);
1263 pch_spi_release_dma(data);
1266 static void pch_spi_free_resources(struct pch_spi_board_data *board_dat,
1267 struct pch_spi_data *data)
1269 dev_dbg(&board_dat->pdev->dev, "%s ENTRY\n", __func__);
1271 flush_work(&data->work);
1274 static int pch_spi_get_resources(struct pch_spi_board_data *board_dat,
1275 struct pch_spi_data *data)
1277 dev_dbg(&board_dat->pdev->dev, "%s ENTRY\n", __func__);
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__);
1284 dev_dbg(&board_dat->pdev->dev, "%s data->irq_reg_sts=true\n", __func__);
1289 static void pch_free_dma_buf(struct pch_spi_board_data *board_dat,
1290 struct pch_spi_data *data)
1292 struct pch_spi_dma_ctrl *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);
1303 static void pch_alloc_dma_buf(struct pch_spi_board_data *board_dat,
1304 struct pch_spi_data *data)
1306 struct pch_spi_dma_ctrl *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);
1317 static int pch_spi_pd_probe(struct platform_device *plat_dev)
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;
1324 dev_dbg(&plat_dev->dev, "%s:debug\n", __func__);
1326 master = spi_alloc_master(&board_dat->pdev->dev,
1327 sizeof(struct pch_spi_data));
1329 dev_err(&plat_dev->dev, "spi_alloc_master[%d] failed.\n",
1334 data = spi_master_get_devdata(master);
1335 data->master = master;
1337 platform_set_drvdata(plat_dev, data);
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__);
1348 data->io_remap_addr += PCH_ADDRESS_SIZE * plat_dev->id;
1350 dev_dbg(&plat_dev->dev, "[ch%d] remap_addr=%p\n",
1351 plat_dev->id, data->io_remap_addr);
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;
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;
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);
1372 ret = pch_spi_get_resources(board_dat, data);
1374 dev_err(&plat_dev->dev, "%s fail(retval=%d)\n", __func__, ret);
1375 goto err_spi_get_resources;
1378 ret = request_irq(board_dat->pdev->irq, pch_spi_handler,
1379 IRQF_SHARED, KBUILD_MODNAME, data);
1381 dev_err(&plat_dev->dev,
1382 "%s request_irq failed\n", __func__);
1383 goto err_request_irq;
1385 data->irq_reg_sts = true;
1387 pch_spi_set_master_mode(master);
1390 dev_info(&plat_dev->dev, "Use DMA for data transfers\n");
1391 pch_alloc_dma_buf(board_dat, data);
1394 ret = spi_register_master(master);
1396 dev_err(&plat_dev->dev,
1397 "%s spi_register_master FAILED\n", __func__);
1398 goto err_spi_register_master;
1403 err_spi_register_master:
1404 pch_free_dma_buf(board_dat, data);
1405 free_irq(board_dat->pdev->irq, data);
1407 pch_spi_free_resources(board_dat, data);
1408 err_spi_get_resources:
1409 pci_iounmap(board_dat->pdev, data->io_remap_addr);
1411 spi_master_put(master);
1416 static int pch_spi_pd_remove(struct platform_device *plat_dev)
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);
1421 unsigned long flags;
1423 dev_dbg(&plat_dev->dev, "%s:[ch%d] irq=%d\n",
1424 __func__, plat_dev->id, board_dat->pdev->irq);
1427 pch_free_dma_buf(board_dat, data);
1429 /* check for any pending messages; no action is taken if the queue
1430 * is still full; but at least we tried. Unload anyway */
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",
1437 spin_unlock_irqrestore(&data->lock, flags);
1438 msleep(PCH_SLEEP_TIME);
1439 spin_lock_irqsave(&data->lock, flags);
1441 spin_unlock_irqrestore(&data->lock, flags);
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);
1452 pci_iounmap(board_dat->pdev, data->io_remap_addr);
1453 spi_unregister_master(data->master);
1458 static int pch_spi_pd_suspend(struct platform_device *pd_dev,
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);
1465 dev_dbg(&pd_dev->dev, "%s ENTRY\n", __func__);
1468 dev_err(&pd_dev->dev,
1469 "%s pci_get_drvdata returned NULL\n", __func__);
1473 /* check if the current message is processed:
1474 Only after thats done the transfer will be suspended */
1476 while ((--count) > 0) {
1477 if (!(data->bcurrent_msg_processing))
1479 msleep(PCH_SLEEP_TIME);
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);
1489 data->irq_reg_sts = false;
1490 dev_dbg(&pd_dev->dev,
1491 "%s free_irq invoked successfully.\n", __func__);
1497 static int pch_spi_pd_resume(struct platform_device *pd_dev)
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);
1504 dev_err(&pd_dev->dev,
1505 "%s pci_get_drvdata returned NULL\n", __func__);
1509 if (!data->irq_reg_sts) {
1511 retval = request_irq(board_dat->pdev->irq, pch_spi_handler,
1512 IRQF_SHARED, KBUILD_MODNAME, data);
1514 dev_err(&pd_dev->dev,
1515 "%s request_irq failed\n", __func__);
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;
1527 #define pch_spi_pd_suspend NULL
1528 #define pch_spi_pd_resume NULL
1531 static struct platform_driver pch_spi_pd_driver = {
1535 .probe = pch_spi_pd_probe,
1536 .remove = pch_spi_pd_remove,
1537 .suspend = pch_spi_pd_suspend,
1538 .resume = pch_spi_pd_resume
1541 static int pch_spi_probe(struct pci_dev *pdev, const struct pci_device_id *id)
1543 struct pch_spi_board_data *board_dat;
1544 struct platform_device *pd_dev = NULL;
1547 struct pch_pd_dev_save *pd_dev_save;
1549 pd_dev_save = kzalloc(sizeof(*pd_dev_save), GFP_KERNEL);
1553 board_dat = kzalloc(sizeof(*board_dat), GFP_KERNEL);
1559 retval = pci_request_regions(pdev, KBUILD_MODNAME);
1561 dev_err(&pdev->dev, "%s request_region failed\n", __func__);
1562 goto pci_request_regions;
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;
1570 retval = pci_enable_device(pdev);
1572 dev_err(&pdev->dev, "%s pci_enable_device failed\n", __func__);
1573 goto pci_enable_device;
1576 for (i = 0; i < board_dat->num; i++) {
1577 pd_dev = platform_device_alloc("pch-spi", i);
1579 dev_err(&pdev->dev, "platform_device_alloc failed\n");
1581 goto err_platform_device;
1583 pd_dev_save->pd_save[i] = pd_dev;
1584 pd_dev->dev.parent = &pdev->dev;
1586 retval = platform_device_add_data(pd_dev, board_dat,
1587 sizeof(*board_dat));
1590 "platform_device_add_data failed\n");
1591 platform_device_put(pd_dev);
1592 goto err_platform_device;
1595 retval = platform_device_add(pd_dev);
1597 dev_err(&pdev->dev, "platform_device_add failed\n");
1598 platform_device_put(pd_dev);
1599 goto err_platform_device;
1603 pci_set_drvdata(pdev, pd_dev_save);
1607 err_platform_device:
1609 platform_device_unregister(pd_dev_save->pd_save[i]);
1610 pci_disable_device(pdev);
1612 pci_release_regions(pdev);
1613 pci_request_regions:
1621 static void pch_spi_remove(struct pci_dev *pdev)
1624 struct pch_pd_dev_save *pd_dev_save = pci_get_drvdata(pdev);
1626 dev_dbg(&pdev->dev, "%s ENTRY:pdev=%p\n", __func__, pdev);
1628 for (i = 0; i < pd_dev_save->num; i++)
1629 platform_device_unregister(pd_dev_save->pd_save[i]);
1631 pci_disable_device(pdev);
1632 pci_release_regions(pdev);
1633 kfree(pd_dev_save->board_dat);
1638 static int pch_spi_suspend(struct pci_dev *pdev, pm_message_t state)
1641 struct pch_pd_dev_save *pd_dev_save = pci_get_drvdata(pdev);
1643 dev_dbg(&pdev->dev, "%s ENTRY\n", __func__);
1645 pd_dev_save->board_dat->suspend_sts = true;
1647 /* save config space */
1648 retval = pci_save_state(pdev);
1650 pci_enable_wake(pdev, PCI_D3hot, 0);
1651 pci_disable_device(pdev);
1652 pci_set_power_state(pdev, PCI_D3hot);
1654 dev_err(&pdev->dev, "%s pci_save_state failed\n", __func__);
1660 static int pch_spi_resume(struct pci_dev *pdev)
1663 struct pch_pd_dev_save *pd_dev_save = pci_get_drvdata(pdev);
1664 dev_dbg(&pdev->dev, "%s ENTRY\n", __func__);
1666 pci_set_power_state(pdev, PCI_D0);
1667 pci_restore_state(pdev);
1669 retval = pci_enable_device(pdev);
1672 "%s pci_enable_device failed\n", __func__);
1674 pci_enable_wake(pdev, PCI_D3hot, 0);
1676 /* set suspend status to false */
1677 pd_dev_save->board_dat->suspend_sts = false;
1683 #define pch_spi_suspend NULL
1684 #define pch_spi_resume NULL
1688 static struct pci_driver pch_spi_pcidev_driver = {
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,
1697 static int __init pch_spi_init(void)
1700 ret = platform_driver_register(&pch_spi_pd_driver);
1704 ret = pci_register_driver(&pch_spi_pcidev_driver);
1706 platform_driver_unregister(&pch_spi_pd_driver);
1712 module_init(pch_spi_init);
1714 static void __exit pch_spi_exit(void)
1716 pci_unregister_driver(&pch_spi_pcidev_driver);
1717 platform_driver_unregister(&pch_spi_pd_driver);
1719 module_exit(pch_spi_exit);
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");
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);