1 // SPDX-License-Identifier: GPL-2.0+
3 // Copyright 2013 Freescale Semiconductor, Inc.
5 // Freescale DSPI driver
6 // This file contains a driver for the Freescale DSPI
9 #include <linux/delay.h>
10 #include <linux/dmaengine.h>
11 #include <linux/dma-mapping.h>
12 #include <linux/interrupt.h>
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/of_device.h>
16 #include <linux/pinctrl/consumer.h>
17 #include <linux/regmap.h>
18 #include <linux/spi/spi.h>
19 #include <linux/spi/spi-fsl-dspi.h>
21 #define DRIVER_NAME "fsl-dspi"
24 #define DSPI_FIFO_SIZE 16
26 #define DSPI_FIFO_SIZE 4
28 #define DSPI_DMA_BUFSIZE (DSPI_FIFO_SIZE * 1024)
31 #define SPI_MCR_MASTER BIT(31)
32 #define SPI_MCR_PCSIS (0x3F << 16)
33 #define SPI_MCR_CLR_TXF BIT(11)
34 #define SPI_MCR_CLR_RXF BIT(10)
35 #define SPI_MCR_XSPI BIT(3)
38 #define SPI_TCR_GET_TCNT(x) (((x) & GENMASK(31, 16)) >> 16)
40 #define SPI_CTAR(x) (0x0c + (((x) & GENMASK(1, 0)) * 4))
41 #define SPI_CTAR_FMSZ(x) (((x) << 27) & GENMASK(30, 27))
42 #define SPI_CTAR_CPOL BIT(26)
43 #define SPI_CTAR_CPHA BIT(25)
44 #define SPI_CTAR_LSBFE BIT(24)
45 #define SPI_CTAR_PCSSCK(x) (((x) << 22) & GENMASK(23, 22))
46 #define SPI_CTAR_PASC(x) (((x) << 20) & GENMASK(21, 20))
47 #define SPI_CTAR_PDT(x) (((x) << 18) & GENMASK(19, 18))
48 #define SPI_CTAR_PBR(x) (((x) << 16) & GENMASK(17, 16))
49 #define SPI_CTAR_CSSCK(x) (((x) << 12) & GENMASK(15, 12))
50 #define SPI_CTAR_ASC(x) (((x) << 8) & GENMASK(11, 8))
51 #define SPI_CTAR_DT(x) (((x) << 4) & GENMASK(7, 4))
52 #define SPI_CTAR_BR(x) ((x) & GENMASK(3, 0))
53 #define SPI_CTAR_SCALE_BITS 0xf
55 #define SPI_CTAR0_SLAVE 0x0c
58 #define SPI_SR_TCFQF BIT(31)
59 #define SPI_SR_EOQF BIT(28)
60 #define SPI_SR_TFUF BIT(27)
61 #define SPI_SR_TFFF BIT(25)
62 #define SPI_SR_CMDTCF BIT(23)
63 #define SPI_SR_SPEF BIT(21)
64 #define SPI_SR_RFOF BIT(19)
65 #define SPI_SR_TFIWF BIT(18)
66 #define SPI_SR_RFDF BIT(17)
67 #define SPI_SR_CMDFFF BIT(16)
68 #define SPI_SR_CLEAR (SPI_SR_TCFQF | SPI_SR_EOQF | \
69 SPI_SR_TFUF | SPI_SR_TFFF | \
70 SPI_SR_CMDTCF | SPI_SR_SPEF | \
71 SPI_SR_RFOF | SPI_SR_TFIWF | \
72 SPI_SR_RFDF | SPI_SR_CMDFFF)
74 #define SPI_RSER_TFFFE BIT(25)
75 #define SPI_RSER_TFFFD BIT(24)
76 #define SPI_RSER_RFDFE BIT(17)
77 #define SPI_RSER_RFDFD BIT(16)
80 #define SPI_RSER_TCFQE BIT(31)
81 #define SPI_RSER_EOQFE BIT(28)
83 #define SPI_PUSHR 0x34
84 #define SPI_PUSHR_CMD_CONT BIT(15)
85 #define SPI_PUSHR_CMD_CTAS(x) (((x) << 12 & GENMASK(14, 12)))
86 #define SPI_PUSHR_CMD_EOQ BIT(11)
87 #define SPI_PUSHR_CMD_CTCNT BIT(10)
88 #define SPI_PUSHR_CMD_PCS(x) (BIT(x) & GENMASK(5, 0))
90 #define SPI_PUSHR_SLAVE 0x34
94 #define SPI_TXFR0 0x3c
95 #define SPI_TXFR1 0x40
96 #define SPI_TXFR2 0x44
97 #define SPI_TXFR3 0x48
98 #define SPI_RXFR0 0x7c
99 #define SPI_RXFR1 0x80
100 #define SPI_RXFR2 0x84
101 #define SPI_RXFR3 0x88
103 #define SPI_CTARE(x) (0x11c + (((x) & GENMASK(1, 0)) * 4))
104 #define SPI_CTARE_FMSZE(x) (((x) & 0x1) << 16)
105 #define SPI_CTARE_DTCP(x) ((x) & 0x7ff)
107 #define SPI_SREX 0x13c
109 #define SPI_FRAME_BITS(bits) SPI_CTAR_FMSZ((bits) - 1)
110 #define SPI_FRAME_EBITS(bits) SPI_CTARE_FMSZE(((bits) - 1) >> 4)
112 /* Register offsets for regmap_pushr */
113 #define PUSHR_CMD 0x0
116 #define DMA_COMPLETION_TIMEOUT msecs_to_jiffies(3000)
123 enum dspi_trans_mode {
129 struct fsl_dspi_devtype_data {
130 enum dspi_trans_mode trans_mode;
135 static const struct fsl_dspi_devtype_data vf610_data = {
136 .trans_mode = DSPI_DMA_MODE,
137 .max_clock_factor = 2,
140 static const struct fsl_dspi_devtype_data ls1021a_v1_data = {
141 .trans_mode = DSPI_TCFQ_MODE,
142 .max_clock_factor = 8,
146 static const struct fsl_dspi_devtype_data ls2085a_data = {
147 .trans_mode = DSPI_TCFQ_MODE,
148 .max_clock_factor = 8,
151 static const struct fsl_dspi_devtype_data coldfire_data = {
152 .trans_mode = DSPI_EOQ_MODE,
153 .max_clock_factor = 8,
156 struct fsl_dspi_dma {
157 /* Length of transfer in words of DSPI_FIFO_SIZE */
161 struct dma_chan *chan_tx;
162 dma_addr_t tx_dma_phys;
163 struct completion cmd_tx_complete;
164 struct dma_async_tx_descriptor *tx_desc;
167 struct dma_chan *chan_rx;
168 dma_addr_t rx_dma_phys;
169 struct completion cmd_rx_complete;
170 struct dma_async_tx_descriptor *rx_desc;
174 struct spi_controller *ctlr;
175 struct platform_device *pdev;
177 struct regmap *regmap;
178 struct regmap *regmap_pushr;
182 struct spi_transfer *cur_transfer;
183 struct spi_message *cur_msg;
184 struct chip_data *cur_chip;
193 const struct fsl_dspi_devtype_data *devtype_data;
195 wait_queue_head_t waitq;
198 struct fsl_dspi_dma *dma;
201 static u32 dspi_pop_tx(struct fsl_dspi *dspi)
206 if (dspi->bytes_per_word == 1)
207 txdata = *(u8 *)dspi->tx;
208 else if (dspi->bytes_per_word == 2)
209 txdata = *(u16 *)dspi->tx;
210 else /* dspi->bytes_per_word == 4 */
211 txdata = *(u32 *)dspi->tx;
212 dspi->tx += dspi->bytes_per_word;
214 dspi->len -= dspi->bytes_per_word;
218 static u32 dspi_pop_tx_pushr(struct fsl_dspi *dspi)
220 u16 cmd = dspi->tx_cmd, data = dspi_pop_tx(dspi);
222 if (spi_controller_is_slave(dspi->ctlr))
226 cmd |= SPI_PUSHR_CMD_CONT;
227 return cmd << 16 | data;
230 static void dspi_push_rx(struct fsl_dspi *dspi, u32 rxdata)
235 /* Mask off undefined bits */
236 rxdata &= (1 << dspi->bits_per_word) - 1;
238 if (dspi->bytes_per_word == 1)
239 *(u8 *)dspi->rx = rxdata;
240 else if (dspi->bytes_per_word == 2)
241 *(u16 *)dspi->rx = rxdata;
242 else /* dspi->bytes_per_word == 4 */
243 *(u32 *)dspi->rx = rxdata;
244 dspi->rx += dspi->bytes_per_word;
247 static void dspi_tx_dma_callback(void *arg)
249 struct fsl_dspi *dspi = arg;
250 struct fsl_dspi_dma *dma = dspi->dma;
252 complete(&dma->cmd_tx_complete);
255 static void dspi_rx_dma_callback(void *arg)
257 struct fsl_dspi *dspi = arg;
258 struct fsl_dspi_dma *dma = dspi->dma;
262 for (i = 0; i < dma->curr_xfer_len; i++)
263 dspi_push_rx(dspi, dspi->dma->rx_dma_buf[i]);
266 complete(&dma->cmd_rx_complete);
269 static int dspi_next_xfer_dma_submit(struct fsl_dspi *dspi)
271 struct device *dev = &dspi->pdev->dev;
272 struct fsl_dspi_dma *dma = dspi->dma;
276 for (i = 0; i < dma->curr_xfer_len; i++)
277 dspi->dma->tx_dma_buf[i] = dspi_pop_tx_pushr(dspi);
279 dma->tx_desc = dmaengine_prep_slave_single(dma->chan_tx,
282 DMA_SLAVE_BUSWIDTH_4_BYTES,
284 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
286 dev_err(dev, "Not able to get desc for DMA xfer\n");
290 dma->tx_desc->callback = dspi_tx_dma_callback;
291 dma->tx_desc->callback_param = dspi;
292 if (dma_submit_error(dmaengine_submit(dma->tx_desc))) {
293 dev_err(dev, "DMA submit failed\n");
297 dma->rx_desc = dmaengine_prep_slave_single(dma->chan_rx,
300 DMA_SLAVE_BUSWIDTH_4_BYTES,
302 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
304 dev_err(dev, "Not able to get desc for DMA xfer\n");
308 dma->rx_desc->callback = dspi_rx_dma_callback;
309 dma->rx_desc->callback_param = dspi;
310 if (dma_submit_error(dmaengine_submit(dma->rx_desc))) {
311 dev_err(dev, "DMA submit failed\n");
315 reinit_completion(&dspi->dma->cmd_rx_complete);
316 reinit_completion(&dspi->dma->cmd_tx_complete);
318 dma_async_issue_pending(dma->chan_rx);
319 dma_async_issue_pending(dma->chan_tx);
321 if (spi_controller_is_slave(dspi->ctlr)) {
322 wait_for_completion_interruptible(&dspi->dma->cmd_rx_complete);
326 time_left = wait_for_completion_timeout(&dspi->dma->cmd_tx_complete,
327 DMA_COMPLETION_TIMEOUT);
328 if (time_left == 0) {
329 dev_err(dev, "DMA tx timeout\n");
330 dmaengine_terminate_all(dma->chan_tx);
331 dmaengine_terminate_all(dma->chan_rx);
335 time_left = wait_for_completion_timeout(&dspi->dma->cmd_rx_complete,
336 DMA_COMPLETION_TIMEOUT);
337 if (time_left == 0) {
338 dev_err(dev, "DMA rx timeout\n");
339 dmaengine_terminate_all(dma->chan_tx);
340 dmaengine_terminate_all(dma->chan_rx);
347 static int dspi_dma_xfer(struct fsl_dspi *dspi)
349 struct spi_message *message = dspi->cur_msg;
350 struct device *dev = &dspi->pdev->dev;
351 struct fsl_dspi_dma *dma = dspi->dma;
352 int curr_remaining_bytes;
353 int bytes_per_buffer;
356 curr_remaining_bytes = dspi->len;
357 bytes_per_buffer = DSPI_DMA_BUFSIZE / DSPI_FIFO_SIZE;
358 while (curr_remaining_bytes) {
359 /* Check if current transfer fits the DMA buffer */
360 dma->curr_xfer_len = curr_remaining_bytes
361 / dspi->bytes_per_word;
362 if (dma->curr_xfer_len > bytes_per_buffer)
363 dma->curr_xfer_len = bytes_per_buffer;
365 ret = dspi_next_xfer_dma_submit(dspi);
367 dev_err(dev, "DMA transfer failed\n");
372 dma->curr_xfer_len * dspi->bytes_per_word;
373 curr_remaining_bytes -= len;
374 message->actual_length += len;
375 if (curr_remaining_bytes < 0)
376 curr_remaining_bytes = 0;
384 static int dspi_request_dma(struct fsl_dspi *dspi, phys_addr_t phy_addr)
386 struct device *dev = &dspi->pdev->dev;
387 struct dma_slave_config cfg;
388 struct fsl_dspi_dma *dma;
391 dma = devm_kzalloc(dev, sizeof(*dma), GFP_KERNEL);
395 dma->chan_rx = dma_request_slave_channel(dev, "rx");
397 dev_err(dev, "rx dma channel not available\n");
402 dma->chan_tx = dma_request_slave_channel(dev, "tx");
404 dev_err(dev, "tx dma channel not available\n");
409 dma->tx_dma_buf = dma_alloc_coherent(dev, DSPI_DMA_BUFSIZE,
410 &dma->tx_dma_phys, GFP_KERNEL);
411 if (!dma->tx_dma_buf) {
416 dma->rx_dma_buf = dma_alloc_coherent(dev, DSPI_DMA_BUFSIZE,
417 &dma->rx_dma_phys, GFP_KERNEL);
418 if (!dma->rx_dma_buf) {
423 cfg.src_addr = phy_addr + SPI_POPR;
424 cfg.dst_addr = phy_addr + SPI_PUSHR;
425 cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
426 cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
427 cfg.src_maxburst = 1;
428 cfg.dst_maxburst = 1;
430 cfg.direction = DMA_DEV_TO_MEM;
431 ret = dmaengine_slave_config(dma->chan_rx, &cfg);
433 dev_err(dev, "can't configure rx dma channel\n");
435 goto err_slave_config;
438 cfg.direction = DMA_MEM_TO_DEV;
439 ret = dmaengine_slave_config(dma->chan_tx, &cfg);
441 dev_err(dev, "can't configure tx dma channel\n");
443 goto err_slave_config;
447 init_completion(&dma->cmd_tx_complete);
448 init_completion(&dma->cmd_rx_complete);
453 dma_free_coherent(dev, DSPI_DMA_BUFSIZE,
454 dma->rx_dma_buf, dma->rx_dma_phys);
456 dma_free_coherent(dev, DSPI_DMA_BUFSIZE,
457 dma->tx_dma_buf, dma->tx_dma_phys);
459 dma_release_channel(dma->chan_tx);
461 dma_release_channel(dma->chan_rx);
463 devm_kfree(dev, dma);
469 static void dspi_release_dma(struct fsl_dspi *dspi)
471 struct fsl_dspi_dma *dma = dspi->dma;
472 struct device *dev = &dspi->pdev->dev;
478 dma_unmap_single(dev, dma->tx_dma_phys,
479 DSPI_DMA_BUFSIZE, DMA_TO_DEVICE);
480 dma_release_channel(dma->chan_tx);
484 dma_unmap_single(dev, dma->rx_dma_phys,
485 DSPI_DMA_BUFSIZE, DMA_FROM_DEVICE);
486 dma_release_channel(dma->chan_rx);
490 static void hz_to_spi_baud(char *pbr, char *br, int speed_hz,
491 unsigned long clkrate)
493 /* Valid baud rate pre-scaler values */
494 int pbr_tbl[4] = {2, 3, 5, 7};
495 int brs[16] = { 2, 4, 6, 8,
497 256, 512, 1024, 2048,
498 4096, 8192, 16384, 32768 };
499 int scale_needed, scale, minscale = INT_MAX;
502 scale_needed = clkrate / speed_hz;
503 if (clkrate % speed_hz)
506 for (i = 0; i < ARRAY_SIZE(brs); i++)
507 for (j = 0; j < ARRAY_SIZE(pbr_tbl); j++) {
508 scale = brs[i] * pbr_tbl[j];
509 if (scale >= scale_needed) {
510 if (scale < minscale) {
519 if (minscale == INT_MAX) {
520 pr_warn("Can not find valid baud rate,speed_hz is %d,clkrate is %ld, we use the max prescaler value.\n",
522 *pbr = ARRAY_SIZE(pbr_tbl) - 1;
523 *br = ARRAY_SIZE(brs) - 1;
527 static void ns_delay_scale(char *psc, char *sc, int delay_ns,
528 unsigned long clkrate)
530 int scale_needed, scale, minscale = INT_MAX;
531 int pscale_tbl[4] = {1, 3, 5, 7};
535 scale_needed = div_u64_rem((u64)delay_ns * clkrate, NSEC_PER_SEC,
540 for (i = 0; i < ARRAY_SIZE(pscale_tbl); i++)
541 for (j = 0; j <= SPI_CTAR_SCALE_BITS; j++) {
542 scale = pscale_tbl[i] * (2 << j);
543 if (scale >= scale_needed) {
544 if (scale < minscale) {
553 if (minscale == INT_MAX) {
554 pr_warn("Cannot find correct scale values for %dns delay at clkrate %ld, using max prescaler value",
556 *psc = ARRAY_SIZE(pscale_tbl) - 1;
557 *sc = SPI_CTAR_SCALE_BITS;
561 static void fifo_write(struct fsl_dspi *dspi)
563 regmap_write(dspi->regmap, SPI_PUSHR, dspi_pop_tx_pushr(dspi));
566 static void cmd_fifo_write(struct fsl_dspi *dspi)
568 u16 cmd = dspi->tx_cmd;
571 cmd |= SPI_PUSHR_CMD_CONT;
572 regmap_write(dspi->regmap_pushr, PUSHR_CMD, cmd);
575 static void tx_fifo_write(struct fsl_dspi *dspi, u16 txdata)
577 regmap_write(dspi->regmap_pushr, PUSHR_TX, txdata);
580 static void dspi_tcfq_write(struct fsl_dspi *dspi)
582 /* Clear transfer count */
583 dspi->tx_cmd |= SPI_PUSHR_CMD_CTCNT;
585 if (dspi->devtype_data->xspi_mode && dspi->bits_per_word > 16) {
586 /* Write two TX FIFO entries first, and then the corresponding
589 u32 data = dspi_pop_tx(dspi);
591 if (dspi->cur_chip->ctar_val & SPI_CTAR_LSBFE) {
593 tx_fifo_write(dspi, data & 0xFFFF);
594 tx_fifo_write(dspi, data >> 16);
597 tx_fifo_write(dspi, data >> 16);
598 tx_fifo_write(dspi, data & 0xFFFF);
600 cmd_fifo_write(dspi);
602 /* Write one entry to both TX FIFO and CMD FIFO
609 static u32 fifo_read(struct fsl_dspi *dspi)
613 regmap_read(dspi->regmap, SPI_POPR, &rxdata);
617 static void dspi_tcfq_read(struct fsl_dspi *dspi)
619 dspi_push_rx(dspi, fifo_read(dspi));
622 static void dspi_eoq_write(struct fsl_dspi *dspi)
624 int fifo_size = DSPI_FIFO_SIZE;
625 u16 xfer_cmd = dspi->tx_cmd;
627 /* Fill TX FIFO with as many transfers as possible */
628 while (dspi->len && fifo_size--) {
629 dspi->tx_cmd = xfer_cmd;
630 /* Request EOQF for last transfer in FIFO */
631 if (dspi->len == dspi->bytes_per_word || fifo_size == 0)
632 dspi->tx_cmd |= SPI_PUSHR_CMD_EOQ;
633 /* Clear transfer count for first transfer in FIFO */
634 if (fifo_size == (DSPI_FIFO_SIZE - 1))
635 dspi->tx_cmd |= SPI_PUSHR_CMD_CTCNT;
636 /* Write combined TX FIFO and CMD FIFO entry */
641 static void dspi_eoq_read(struct fsl_dspi *dspi)
643 int fifo_size = DSPI_FIFO_SIZE;
645 /* Read one FIFO entry and push to rx buffer */
646 while ((dspi->rx < dspi->rx_end) && fifo_size--)
647 dspi_push_rx(dspi, fifo_read(dspi));
650 static int dspi_rxtx(struct fsl_dspi *dspi)
652 struct spi_message *msg = dspi->cur_msg;
653 enum dspi_trans_mode trans_mode;
657 /* Get transfer counter (in number of SPI transfers). It was
658 * reset to 0 when transfer(s) were started.
660 regmap_read(dspi->regmap, SPI_TCR, &spi_tcr);
661 spi_tcnt = SPI_TCR_GET_TCNT(spi_tcr);
662 /* Update total number of bytes that were transferred */
663 msg->actual_length += spi_tcnt * dspi->bytes_per_word;
665 trans_mode = dspi->devtype_data->trans_mode;
666 if (trans_mode == DSPI_EOQ_MODE)
668 else if (trans_mode == DSPI_TCFQ_MODE)
669 dspi_tcfq_read(dspi);
675 if (trans_mode == DSPI_EOQ_MODE)
676 dspi_eoq_write(dspi);
677 else if (trans_mode == DSPI_TCFQ_MODE)
678 dspi_tcfq_write(dspi);
683 static int dspi_poll(struct fsl_dspi *dspi)
689 regmap_read(dspi->regmap, SPI_SR, &spi_sr);
690 regmap_write(dspi->regmap, SPI_SR, spi_sr);
692 if (spi_sr & (SPI_SR_EOQF | SPI_SR_TCFQF))
699 return dspi_rxtx(dspi);
702 static irqreturn_t dspi_interrupt(int irq, void *dev_id)
704 struct fsl_dspi *dspi = (struct fsl_dspi *)dev_id;
707 regmap_read(dspi->regmap, SPI_SR, &spi_sr);
708 regmap_write(dspi->regmap, SPI_SR, spi_sr);
710 if (!(spi_sr & (SPI_SR_EOQF | SPI_SR_TCFQF)))
713 if (dspi_rxtx(dspi) == 0) {
715 wake_up_interruptible(&dspi->waitq);
721 static int dspi_transfer_one_message(struct spi_controller *ctlr,
722 struct spi_message *message)
724 struct fsl_dspi *dspi = spi_controller_get_devdata(ctlr);
725 struct spi_device *spi = message->spi;
726 enum dspi_trans_mode trans_mode;
727 struct spi_transfer *transfer;
730 message->actual_length = 0;
732 list_for_each_entry(transfer, &message->transfers, transfer_list) {
733 dspi->cur_transfer = transfer;
734 dspi->cur_msg = message;
735 dspi->cur_chip = spi_get_ctldata(spi);
736 /* Prepare command word for CMD FIFO */
737 dspi->tx_cmd = SPI_PUSHR_CMD_CTAS(0) |
738 SPI_PUSHR_CMD_PCS(spi->chip_select);
739 if (list_is_last(&dspi->cur_transfer->transfer_list,
740 &dspi->cur_msg->transfers)) {
741 /* Leave PCS activated after last transfer when
744 if (transfer->cs_change)
745 dspi->tx_cmd |= SPI_PUSHR_CMD_CONT;
747 /* Keep PCS active between transfers in same message
748 * when cs_change is not set, and de-activate PCS
749 * between transfers in the same message when
752 if (!transfer->cs_change)
753 dspi->tx_cmd |= SPI_PUSHR_CMD_CONT;
756 dspi->void_write_data = dspi->cur_chip->void_write_data;
758 dspi->tx = transfer->tx_buf;
759 dspi->rx = transfer->rx_buf;
760 dspi->rx_end = dspi->rx + transfer->len;
761 dspi->len = transfer->len;
762 /* Validated transfer specific frame size (defaults applied) */
763 dspi->bits_per_word = transfer->bits_per_word;
764 if (transfer->bits_per_word <= 8)
765 dspi->bytes_per_word = 1;
766 else if (transfer->bits_per_word <= 16)
767 dspi->bytes_per_word = 2;
769 dspi->bytes_per_word = 4;
771 regmap_update_bits(dspi->regmap, SPI_MCR,
772 SPI_MCR_CLR_TXF | SPI_MCR_CLR_RXF,
773 SPI_MCR_CLR_TXF | SPI_MCR_CLR_RXF);
774 regmap_write(dspi->regmap, SPI_CTAR(0),
775 dspi->cur_chip->ctar_val |
776 SPI_FRAME_BITS(transfer->bits_per_word));
777 if (dspi->devtype_data->xspi_mode)
778 regmap_write(dspi->regmap, SPI_CTARE(0),
779 SPI_FRAME_EBITS(transfer->bits_per_word) |
782 trans_mode = dspi->devtype_data->trans_mode;
783 switch (trans_mode) {
785 regmap_write(dspi->regmap, SPI_RSER, SPI_RSER_EOQFE);
786 dspi_eoq_write(dspi);
789 regmap_write(dspi->regmap, SPI_RSER, SPI_RSER_TCFQE);
790 dspi_tcfq_write(dspi);
793 regmap_write(dspi->regmap, SPI_RSER,
794 SPI_RSER_TFFFE | SPI_RSER_TFFFD |
795 SPI_RSER_RFDFE | SPI_RSER_RFDFD);
796 status = dspi_dma_xfer(dspi);
799 dev_err(&dspi->pdev->dev, "unsupported trans_mode %u\n",
807 status = dspi_poll(dspi);
808 } while (status == -EINPROGRESS);
809 } else if (trans_mode != DSPI_DMA_MODE) {
810 status = wait_event_interruptible(dspi->waitq,
815 dev_err(&dspi->pdev->dev,
816 "Waiting for transfer to complete failed!\n");
818 if (transfer->delay_usecs)
819 udelay(transfer->delay_usecs);
823 message->status = status;
824 spi_finalize_current_message(ctlr);
829 static int dspi_setup(struct spi_device *spi)
831 struct fsl_dspi *dspi = spi_controller_get_devdata(spi->controller);
832 unsigned char br = 0, pbr = 0, pcssck = 0, cssck = 0;
833 u32 cs_sck_delay = 0, sck_cs_delay = 0;
834 struct fsl_dspi_platform_data *pdata;
835 unsigned char pasc = 0, asc = 0;
836 struct chip_data *chip;
837 unsigned long clkrate;
839 /* Only alloc on first setup */
840 chip = spi_get_ctldata(spi);
842 chip = kzalloc(sizeof(struct chip_data), GFP_KERNEL);
847 pdata = dev_get_platdata(&dspi->pdev->dev);
850 of_property_read_u32(spi->dev.of_node, "fsl,spi-cs-sck-delay",
853 of_property_read_u32(spi->dev.of_node, "fsl,spi-sck-cs-delay",
856 cs_sck_delay = pdata->cs_sck_delay;
857 sck_cs_delay = pdata->sck_cs_delay;
860 chip->void_write_data = 0;
862 clkrate = clk_get_rate(dspi->clk);
863 hz_to_spi_baud(&pbr, &br, spi->max_speed_hz, clkrate);
865 /* Set PCS to SCK delay scale values */
866 ns_delay_scale(&pcssck, &cssck, cs_sck_delay, clkrate);
868 /* Set After SCK delay scale values */
869 ns_delay_scale(&pasc, &asc, sck_cs_delay, clkrate);
872 if (spi->mode & SPI_CPOL)
873 chip->ctar_val |= SPI_CTAR_CPOL;
874 if (spi->mode & SPI_CPHA)
875 chip->ctar_val |= SPI_CTAR_CPHA;
877 if (!spi_controller_is_slave(dspi->ctlr)) {
878 chip->ctar_val |= SPI_CTAR_PCSSCK(pcssck) |
879 SPI_CTAR_CSSCK(cssck) |
880 SPI_CTAR_PASC(pasc) |
885 if (spi->mode & SPI_LSB_FIRST)
886 chip->ctar_val |= SPI_CTAR_LSBFE;
889 spi_set_ctldata(spi, chip);
894 static void dspi_cleanup(struct spi_device *spi)
896 struct chip_data *chip = spi_get_ctldata((struct spi_device *)spi);
898 dev_dbg(&spi->dev, "spi_device %u.%u cleanup\n",
899 spi->controller->bus_num, spi->chip_select);
904 static const struct of_device_id fsl_dspi_dt_ids[] = {
905 { .compatible = "fsl,vf610-dspi", .data = &vf610_data, },
906 { .compatible = "fsl,ls1021a-v1.0-dspi", .data = &ls1021a_v1_data, },
907 { .compatible = "fsl,ls2085a-dspi", .data = &ls2085a_data, },
910 MODULE_DEVICE_TABLE(of, fsl_dspi_dt_ids);
912 #ifdef CONFIG_PM_SLEEP
913 static int dspi_suspend(struct device *dev)
915 struct spi_controller *ctlr = dev_get_drvdata(dev);
916 struct fsl_dspi *dspi = spi_controller_get_devdata(ctlr);
918 spi_controller_suspend(ctlr);
919 clk_disable_unprepare(dspi->clk);
921 pinctrl_pm_select_sleep_state(dev);
926 static int dspi_resume(struct device *dev)
928 struct spi_controller *ctlr = dev_get_drvdata(dev);
929 struct fsl_dspi *dspi = spi_controller_get_devdata(ctlr);
932 pinctrl_pm_select_default_state(dev);
934 ret = clk_prepare_enable(dspi->clk);
937 spi_controller_resume(ctlr);
941 #endif /* CONFIG_PM_SLEEP */
943 static SIMPLE_DEV_PM_OPS(dspi_pm, dspi_suspend, dspi_resume);
945 static const struct regmap_range dspi_volatile_ranges[] = {
946 regmap_reg_range(SPI_MCR, SPI_TCR),
947 regmap_reg_range(SPI_SR, SPI_SR),
948 regmap_reg_range(SPI_PUSHR, SPI_RXFR3),
951 static const struct regmap_access_table dspi_volatile_table = {
952 .yes_ranges = dspi_volatile_ranges,
953 .n_yes_ranges = ARRAY_SIZE(dspi_volatile_ranges),
956 static const struct regmap_config dspi_regmap_config = {
960 .max_register = 0x88,
961 .volatile_table = &dspi_volatile_table,
964 static const struct regmap_range dspi_xspi_volatile_ranges[] = {
965 regmap_reg_range(SPI_MCR, SPI_TCR),
966 regmap_reg_range(SPI_SR, SPI_SR),
967 regmap_reg_range(SPI_PUSHR, SPI_RXFR3),
968 regmap_reg_range(SPI_SREX, SPI_SREX),
971 static const struct regmap_access_table dspi_xspi_volatile_table = {
972 .yes_ranges = dspi_xspi_volatile_ranges,
973 .n_yes_ranges = ARRAY_SIZE(dspi_xspi_volatile_ranges),
976 static const struct regmap_config dspi_xspi_regmap_config[] = {
981 .max_register = 0x13c,
982 .volatile_table = &dspi_xspi_volatile_table,
993 static void dspi_init(struct fsl_dspi *dspi)
995 unsigned int mcr = SPI_MCR_PCSIS;
997 if (dspi->devtype_data->xspi_mode)
999 if (!spi_controller_is_slave(dspi->ctlr))
1000 mcr |= SPI_MCR_MASTER;
1002 regmap_write(dspi->regmap, SPI_MCR, mcr);
1003 regmap_write(dspi->regmap, SPI_SR, SPI_SR_CLEAR);
1004 if (dspi->devtype_data->xspi_mode)
1005 regmap_write(dspi->regmap, SPI_CTARE(0),
1006 SPI_CTARE_FMSZE(0) | SPI_CTARE_DTCP(1));
1009 static int dspi_probe(struct platform_device *pdev)
1011 struct device_node *np = pdev->dev.of_node;
1012 const struct regmap_config *regmap_config;
1013 struct fsl_dspi_platform_data *pdata;
1014 struct spi_controller *ctlr;
1015 int ret, cs_num, bus_num;
1016 struct fsl_dspi *dspi;
1017 struct resource *res;
1020 ctlr = spi_alloc_master(&pdev->dev, sizeof(struct fsl_dspi));
1024 dspi = spi_controller_get_devdata(ctlr);
1028 ctlr->setup = dspi_setup;
1029 ctlr->transfer_one_message = dspi_transfer_one_message;
1030 ctlr->dev.of_node = pdev->dev.of_node;
1032 ctlr->cleanup = dspi_cleanup;
1033 ctlr->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST;
1035 pdata = dev_get_platdata(&pdev->dev);
1037 ctlr->num_chipselect = pdata->cs_num;
1038 ctlr->bus_num = pdata->bus_num;
1040 dspi->devtype_data = &coldfire_data;
1043 ret = of_property_read_u32(np, "spi-num-chipselects", &cs_num);
1045 dev_err(&pdev->dev, "can't get spi-num-chipselects\n");
1048 ctlr->num_chipselect = cs_num;
1050 ret = of_property_read_u32(np, "bus-num", &bus_num);
1052 dev_err(&pdev->dev, "can't get bus-num\n");
1055 ctlr->bus_num = bus_num;
1057 if (of_property_read_bool(np, "spi-slave"))
1060 dspi->devtype_data = of_device_get_match_data(&pdev->dev);
1061 if (!dspi->devtype_data) {
1062 dev_err(&pdev->dev, "can't get devtype_data\n");
1068 if (dspi->devtype_data->xspi_mode)
1069 ctlr->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32);
1071 ctlr->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 16);
1073 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1074 base = devm_ioremap_resource(&pdev->dev, res);
1076 ret = PTR_ERR(base);
1080 if (dspi->devtype_data->xspi_mode)
1081 regmap_config = &dspi_xspi_regmap_config[0];
1083 regmap_config = &dspi_regmap_config;
1084 dspi->regmap = devm_regmap_init_mmio(&pdev->dev, base, regmap_config);
1085 if (IS_ERR(dspi->regmap)) {
1086 dev_err(&pdev->dev, "failed to init regmap: %ld\n",
1087 PTR_ERR(dspi->regmap));
1088 ret = PTR_ERR(dspi->regmap);
1092 if (dspi->devtype_data->xspi_mode) {
1093 dspi->regmap_pushr = devm_regmap_init_mmio(
1094 &pdev->dev, base + SPI_PUSHR,
1095 &dspi_xspi_regmap_config[1]);
1096 if (IS_ERR(dspi->regmap_pushr)) {
1098 "failed to init pushr regmap: %ld\n",
1099 PTR_ERR(dspi->regmap_pushr));
1100 ret = PTR_ERR(dspi->regmap_pushr);
1105 dspi->clk = devm_clk_get(&pdev->dev, "dspi");
1106 if (IS_ERR(dspi->clk)) {
1107 ret = PTR_ERR(dspi->clk);
1108 dev_err(&pdev->dev, "unable to get clock\n");
1111 ret = clk_prepare_enable(dspi->clk);
1117 dspi->irq = platform_get_irq(pdev, 0);
1118 if (dspi->irq <= 0) {
1119 dev_info(&pdev->dev,
1120 "can't get platform irq, using poll mode\n");
1125 ret = devm_request_irq(&pdev->dev, dspi->irq, dspi_interrupt,
1126 IRQF_SHARED, pdev->name, dspi);
1128 dev_err(&pdev->dev, "Unable to attach DSPI interrupt\n");
1132 init_waitqueue_head(&dspi->waitq);
1135 if (dspi->devtype_data->trans_mode == DSPI_DMA_MODE) {
1136 ret = dspi_request_dma(dspi, res->start);
1138 dev_err(&pdev->dev, "can't get dma channels\n");
1143 ctlr->max_speed_hz =
1144 clk_get_rate(dspi->clk) / dspi->devtype_data->max_clock_factor;
1146 platform_set_drvdata(pdev, ctlr);
1148 ret = spi_register_controller(ctlr);
1150 dev_err(&pdev->dev, "Problem registering DSPI ctlr\n");
1157 clk_disable_unprepare(dspi->clk);
1159 spi_controller_put(ctlr);
1164 static int dspi_remove(struct platform_device *pdev)
1166 struct spi_controller *ctlr = platform_get_drvdata(pdev);
1167 struct fsl_dspi *dspi = spi_controller_get_devdata(ctlr);
1169 /* Disconnect from the SPI framework */
1170 dspi_release_dma(dspi);
1171 clk_disable_unprepare(dspi->clk);
1172 spi_unregister_controller(dspi->ctlr);
1177 static struct platform_driver fsl_dspi_driver = {
1178 .driver.name = DRIVER_NAME,
1179 .driver.of_match_table = fsl_dspi_dt_ids,
1180 .driver.owner = THIS_MODULE,
1181 .driver.pm = &dspi_pm,
1182 .probe = dspi_probe,
1183 .remove = dspi_remove,
1185 module_platform_driver(fsl_dspi_driver);
1187 MODULE_DESCRIPTION("Freescale DSPI Controller Driver");
1188 MODULE_LICENSE("GPL");
1189 MODULE_ALIAS("platform:" DRIVER_NAME);