1 // SPDX-License-Identifier: GPL-2.0+
3 // Freescale i.MX7ULP LPSPI driver
5 // Copyright 2016 Freescale Semiconductor, Inc.
6 // Copyright 2018 NXP Semiconductors
9 #include <linux/completion.h>
10 #include <linux/delay.h>
11 #include <linux/dmaengine.h>
12 #include <linux/dma-mapping.h>
13 #include <linux/err.h>
14 #include <linux/gpio.h>
15 #include <linux/interrupt.h>
17 #include <linux/irq.h>
18 #include <linux/kernel.h>
19 #include <linux/module.h>
21 #include <linux/of_device.h>
22 #include <linux/of_gpio.h>
23 #include <linux/pinctrl/consumer.h>
24 #include <linux/platform_device.h>
25 #include <linux/platform_data/dma-imx.h>
26 #include <linux/platform_data/spi-imx.h>
27 #include <linux/pm_runtime.h>
28 #include <linux/slab.h>
29 #include <linux/spi/spi.h>
30 #include <linux/spi/spi_bitbang.h>
31 #include <linux/types.h>
33 #define DRIVER_NAME "fsl_lpspi"
35 #define FSL_LPSPI_RPM_TIMEOUT 50 /* 50ms */
37 /* The maximum bytes that edma can transfer once.*/
38 #define FSL_LPSPI_MAX_EDMA_BYTES ((1 << 15) - 1)
40 /* i.MX7ULP LPSPI registers */
41 #define IMX7ULP_VERID 0x0
42 #define IMX7ULP_PARAM 0x4
43 #define IMX7ULP_CR 0x10
44 #define IMX7ULP_SR 0x14
45 #define IMX7ULP_IER 0x18
46 #define IMX7ULP_DER 0x1c
47 #define IMX7ULP_CFGR0 0x20
48 #define IMX7ULP_CFGR1 0x24
49 #define IMX7ULP_DMR0 0x30
50 #define IMX7ULP_DMR1 0x34
51 #define IMX7ULP_CCR 0x40
52 #define IMX7ULP_FCR 0x58
53 #define IMX7ULP_FSR 0x5c
54 #define IMX7ULP_TCR 0x60
55 #define IMX7ULP_TDR 0x64
56 #define IMX7ULP_RSR 0x70
57 #define IMX7ULP_RDR 0x74
59 /* General control register field define */
64 #define SR_MBF BIT(24)
65 #define SR_TCF BIT(10)
69 #define IER_TCIE BIT(10)
70 #define IER_FCIE BIT(9)
71 #define IER_RDIE BIT(1)
72 #define IER_TDIE BIT(0)
73 #define DER_RDDE BIT(1)
74 #define DER_TDDE BIT(0)
75 #define CFGR1_PCSCFG BIT(27)
76 #define CFGR1_PINCFG (BIT(24)|BIT(25))
77 #define CFGR1_PCSPOL BIT(8)
78 #define CFGR1_NOSTALL BIT(3)
79 #define CFGR1_MASTER BIT(0)
80 #define FSR_RXCOUNT (BIT(16)|BIT(17)|BIT(18))
81 #define RSR_RXEMPTY BIT(1)
82 #define TCR_CPOL BIT(31)
83 #define TCR_CPHA BIT(30)
84 #define TCR_CONT BIT(21)
85 #define TCR_CONTC BIT(20)
86 #define TCR_RXMSK BIT(19)
87 #define TCR_TXMSK BIT(18)
89 static int clkdivs[] = {1, 2, 4, 8, 16, 32, 64, 128};
99 struct fsl_lpspi_data {
102 unsigned long base_phys;
110 void (*tx)(struct fsl_lpspi_data *);
111 void (*rx)(struct fsl_lpspi_data *);
118 struct lpspi_config config;
119 struct completion xfer_done;
125 struct completion dma_rx_completion;
126 struct completion dma_tx_completion;
131 static const struct of_device_id fsl_lpspi_dt_ids[] = {
132 { .compatible = "fsl,imx7ulp-spi", },
135 MODULE_DEVICE_TABLE(of, fsl_lpspi_dt_ids);
137 #define LPSPI_BUF_RX(type) \
138 static void fsl_lpspi_buf_rx_##type(struct fsl_lpspi_data *fsl_lpspi) \
140 unsigned int val = readl(fsl_lpspi->base + IMX7ULP_RDR); \
142 if (fsl_lpspi->rx_buf) { \
143 *(type *)fsl_lpspi->rx_buf = val; \
144 fsl_lpspi->rx_buf += sizeof(type); \
148 #define LPSPI_BUF_TX(type) \
149 static void fsl_lpspi_buf_tx_##type(struct fsl_lpspi_data *fsl_lpspi) \
153 if (fsl_lpspi->tx_buf) { \
154 val = *(type *)fsl_lpspi->tx_buf; \
155 fsl_lpspi->tx_buf += sizeof(type); \
158 fsl_lpspi->remain -= sizeof(type); \
159 writel(val, fsl_lpspi->base + IMX7ULP_TDR); \
169 static void fsl_lpspi_intctrl(struct fsl_lpspi_data *fsl_lpspi,
172 writel(enable, fsl_lpspi->base + IMX7ULP_IER);
175 static int fsl_lpspi_bytes_per_word(const int bpw)
177 return DIV_ROUND_UP(bpw, BITS_PER_BYTE);
180 static bool fsl_lpspi_can_dma(struct spi_controller *controller,
181 struct spi_device *spi,
182 struct spi_transfer *transfer)
184 unsigned int bytes_per_word;
186 if (!controller->dma_rx)
189 bytes_per_word = fsl_lpspi_bytes_per_word(transfer->bits_per_word);
191 switch (bytes_per_word)
204 static int lpspi_prepare_xfer_hardware(struct spi_controller *controller)
206 struct fsl_lpspi_data *fsl_lpspi =
207 spi_controller_get_devdata(controller);
210 ret = pm_runtime_get_sync(fsl_lpspi->dev);
212 dev_err(fsl_lpspi->dev, "failed to enable clock\n");
219 static int lpspi_unprepare_xfer_hardware(struct spi_controller *controller)
221 struct fsl_lpspi_data *fsl_lpspi =
222 spi_controller_get_devdata(controller);
224 pm_runtime_mark_last_busy(fsl_lpspi->dev);
225 pm_runtime_put_autosuspend(fsl_lpspi->dev);
230 static int fsl_lpspi_prepare_message(struct spi_controller *controller,
231 struct spi_message *msg)
233 struct fsl_lpspi_data *fsl_lpspi =
234 spi_controller_get_devdata(controller);
235 struct spi_device *spi = msg->spi;
236 int gpio = fsl_lpspi->chipselect[spi->chip_select];
238 if (gpio_is_valid(gpio))
239 gpio_direction_output(gpio, spi->mode & SPI_CS_HIGH ? 0 : 1);
244 static void fsl_lpspi_write_tx_fifo(struct fsl_lpspi_data *fsl_lpspi)
249 txfifo_cnt = readl(fsl_lpspi->base + IMX7ULP_FSR) & 0xff;
251 while (txfifo_cnt < fsl_lpspi->txfifosize) {
252 if (!fsl_lpspi->remain)
254 fsl_lpspi->tx(fsl_lpspi);
258 if (txfifo_cnt < fsl_lpspi->txfifosize) {
259 if (!fsl_lpspi->is_slave) {
260 temp = readl(fsl_lpspi->base + IMX7ULP_TCR);
262 writel(temp, fsl_lpspi->base + IMX7ULP_TCR);
265 fsl_lpspi_intctrl(fsl_lpspi, IER_FCIE);
267 fsl_lpspi_intctrl(fsl_lpspi, IER_TDIE);
270 static void fsl_lpspi_read_rx_fifo(struct fsl_lpspi_data *fsl_lpspi)
272 while (!(readl(fsl_lpspi->base + IMX7ULP_RSR) & RSR_RXEMPTY))
273 fsl_lpspi->rx(fsl_lpspi);
276 static void fsl_lpspi_set_cmd(struct fsl_lpspi_data *fsl_lpspi)
280 temp |= fsl_lpspi->config.bpw - 1;
281 temp |= (fsl_lpspi->config.mode & 0x3) << 30;
282 if (!fsl_lpspi->is_slave) {
283 temp |= fsl_lpspi->config.prescale << 27;
284 temp |= (fsl_lpspi->config.chip_select & 0x3) << 24;
287 * Set TCR_CONT will keep SS asserted after current transfer.
288 * For the first transfer, clear TCR_CONTC to assert SS.
289 * For subsequent transfer, set TCR_CONTC to keep SS asserted.
291 if (!fsl_lpspi->usedma) {
293 if (fsl_lpspi->is_first_byte)
299 writel(temp, fsl_lpspi->base + IMX7ULP_TCR);
301 dev_dbg(fsl_lpspi->dev, "TCR=0x%x\n", temp);
304 static void fsl_lpspi_set_watermark(struct fsl_lpspi_data *fsl_lpspi)
308 if (!fsl_lpspi->usedma)
309 temp = fsl_lpspi->watermark >> 1 |
310 (fsl_lpspi->watermark >> 1) << 16;
312 temp = fsl_lpspi->watermark >> 1;
314 writel(temp, fsl_lpspi->base + IMX7ULP_FCR);
316 dev_dbg(fsl_lpspi->dev, "FCR=0x%x\n", temp);
319 static int fsl_lpspi_set_bitrate(struct fsl_lpspi_data *fsl_lpspi)
321 struct lpspi_config config = fsl_lpspi->config;
322 unsigned int perclk_rate, scldiv;
325 perclk_rate = clk_get_rate(fsl_lpspi->clk_per);
327 if (config.speed_hz > perclk_rate / 2) {
328 dev_err(fsl_lpspi->dev,
329 "per-clk should be at least two times of transfer speed");
333 for (prescale = 0; prescale < 8; prescale++) {
334 scldiv = perclk_rate /
335 (clkdivs[prescale] * config.speed_hz) - 2;
337 fsl_lpspi->config.prescale = prescale;
342 if (prescale == 8 && scldiv >= 256)
345 writel(scldiv | (scldiv << 8) | ((scldiv >> 1) << 16),
346 fsl_lpspi->base + IMX7ULP_CCR);
348 dev_dbg(fsl_lpspi->dev, "perclk=%d, speed=%d, prescale=%d, scldiv=%d\n",
349 perclk_rate, config.speed_hz, prescale, scldiv);
354 static int fsl_lpspi_dma_configure(struct spi_controller *controller)
357 enum dma_slave_buswidth buswidth;
358 struct dma_slave_config rx = {}, tx = {};
359 struct fsl_lpspi_data *fsl_lpspi =
360 spi_controller_get_devdata(controller);
362 switch (fsl_lpspi_bytes_per_word(fsl_lpspi->config.bpw)) {
364 buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
367 buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
370 buswidth = DMA_SLAVE_BUSWIDTH_1_BYTE;
376 tx.direction = DMA_MEM_TO_DEV;
377 tx.dst_addr = fsl_lpspi->base_phys + IMX7ULP_TDR;
378 tx.dst_addr_width = buswidth;
380 ret = dmaengine_slave_config(controller->dma_tx, &tx);
382 dev_err(fsl_lpspi->dev, "TX dma configuration failed with %d\n",
387 rx.direction = DMA_DEV_TO_MEM;
388 rx.src_addr = fsl_lpspi->base_phys + IMX7ULP_RDR;
389 rx.src_addr_width = buswidth;
391 ret = dmaengine_slave_config(controller->dma_rx, &rx);
393 dev_err(fsl_lpspi->dev, "RX dma configuration failed with %d\n",
401 static int fsl_lpspi_config(struct fsl_lpspi_data *fsl_lpspi)
406 if (!fsl_lpspi->is_slave) {
407 ret = fsl_lpspi_set_bitrate(fsl_lpspi);
412 fsl_lpspi_set_watermark(fsl_lpspi);
414 if (!fsl_lpspi->is_slave)
418 if (fsl_lpspi->config.mode & SPI_CS_HIGH)
419 temp |= CFGR1_PCSPOL;
420 writel(temp, fsl_lpspi->base + IMX7ULP_CFGR1);
422 temp = readl(fsl_lpspi->base + IMX7ULP_CR);
423 temp |= CR_RRF | CR_RTF | CR_MEN;
424 writel(temp, fsl_lpspi->base + IMX7ULP_CR);
427 if (fsl_lpspi->usedma)
428 temp = DER_TDDE | DER_RDDE;
429 writel(temp, fsl_lpspi->base + IMX7ULP_DER);
434 static int fsl_lpspi_setup_transfer(struct spi_controller *controller,
435 struct spi_device *spi,
436 struct spi_transfer *t)
438 struct fsl_lpspi_data *fsl_lpspi =
439 spi_controller_get_devdata(spi->controller);
444 fsl_lpspi->config.mode = spi->mode;
445 fsl_lpspi->config.bpw = t->bits_per_word;
446 fsl_lpspi->config.speed_hz = t->speed_hz;
447 fsl_lpspi->config.chip_select = spi->chip_select;
449 if (!fsl_lpspi->config.speed_hz)
450 fsl_lpspi->config.speed_hz = spi->max_speed_hz;
451 if (!fsl_lpspi->config.bpw)
452 fsl_lpspi->config.bpw = spi->bits_per_word;
454 /* Initialize the functions for transfer */
455 if (fsl_lpspi->config.bpw <= 8) {
456 fsl_lpspi->rx = fsl_lpspi_buf_rx_u8;
457 fsl_lpspi->tx = fsl_lpspi_buf_tx_u8;
458 } else if (fsl_lpspi->config.bpw <= 16) {
459 fsl_lpspi->rx = fsl_lpspi_buf_rx_u16;
460 fsl_lpspi->tx = fsl_lpspi_buf_tx_u16;
462 fsl_lpspi->rx = fsl_lpspi_buf_rx_u32;
463 fsl_lpspi->tx = fsl_lpspi_buf_tx_u32;
466 if (t->len <= fsl_lpspi->txfifosize)
467 fsl_lpspi->watermark = t->len;
469 fsl_lpspi->watermark = fsl_lpspi->txfifosize;
471 if (fsl_lpspi_can_dma(controller, spi, t))
472 fsl_lpspi->usedma = 1;
474 fsl_lpspi->usedma = 0;
476 return fsl_lpspi_config(fsl_lpspi);
479 static int fsl_lpspi_slave_abort(struct spi_controller *controller)
481 struct fsl_lpspi_data *fsl_lpspi =
482 spi_controller_get_devdata(controller);
484 fsl_lpspi->slave_aborted = true;
485 complete(&fsl_lpspi->xfer_done);
489 static int fsl_lpspi_wait_for_completion(struct spi_controller *controller)
491 struct fsl_lpspi_data *fsl_lpspi =
492 spi_controller_get_devdata(controller);
494 if (fsl_lpspi->is_slave) {
495 if (wait_for_completion_interruptible(&fsl_lpspi->xfer_done) ||
496 fsl_lpspi->slave_aborted) {
497 dev_dbg(fsl_lpspi->dev, "interrupted\n");
501 if (!wait_for_completion_timeout(&fsl_lpspi->xfer_done, HZ)) {
502 dev_dbg(fsl_lpspi->dev, "wait for completion timeout\n");
510 static int fsl_lpspi_reset(struct fsl_lpspi_data *fsl_lpspi)
514 if (!fsl_lpspi->usedma) {
515 /* Disable all interrupt */
516 fsl_lpspi_intctrl(fsl_lpspi, 0);
519 /* W1C for all flags in SR */
521 writel(temp, fsl_lpspi->base + IMX7ULP_SR);
523 /* Clear FIFO and disable module */
524 temp = CR_RRF | CR_RTF;
525 writel(temp, fsl_lpspi->base + IMX7ULP_CR);
530 static void fsl_lpspi_dma_rx_callback(void *cookie)
532 struct fsl_lpspi_data *fsl_lpspi = (struct fsl_lpspi_data *)cookie;
534 complete(&fsl_lpspi->dma_rx_completion);
537 static void fsl_lpspi_dma_tx_callback(void *cookie)
539 struct fsl_lpspi_data *fsl_lpspi = (struct fsl_lpspi_data *)cookie;
541 complete(&fsl_lpspi->dma_tx_completion);
544 static int fsl_lpspi_calculate_timeout(struct fsl_lpspi_data *fsl_lpspi,
547 unsigned long timeout = 0;
549 /* Time with actual data transfer and CS change delay related to HW */
550 timeout = (8 + 4) * size / fsl_lpspi->config.speed_hz;
552 /* Add extra second for scheduler related activities */
555 /* Double calculated timeout */
556 return msecs_to_jiffies(2 * timeout * MSEC_PER_SEC);
559 static int fsl_lpspi_dma_transfer(struct spi_controller *controller,
560 struct fsl_lpspi_data *fsl_lpspi,
561 struct spi_transfer *transfer)
563 struct dma_async_tx_descriptor *desc_tx, *desc_rx;
564 unsigned long transfer_timeout;
565 unsigned long timeout;
566 struct sg_table *tx = &transfer->tx_sg, *rx = &transfer->rx_sg;
569 ret = fsl_lpspi_dma_configure(controller);
573 desc_rx = dmaengine_prep_slave_sg(controller->dma_rx,
574 rx->sgl, rx->nents, DMA_DEV_TO_MEM,
575 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
579 desc_rx->callback = fsl_lpspi_dma_rx_callback;
580 desc_rx->callback_param = (void *)fsl_lpspi;
581 dmaengine_submit(desc_rx);
582 reinit_completion(&fsl_lpspi->dma_rx_completion);
583 dma_async_issue_pending(controller->dma_rx);
585 desc_tx = dmaengine_prep_slave_sg(controller->dma_tx,
586 tx->sgl, tx->nents, DMA_MEM_TO_DEV,
587 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
589 dmaengine_terminate_all(controller->dma_tx);
593 desc_tx->callback = fsl_lpspi_dma_tx_callback;
594 desc_tx->callback_param = (void *)fsl_lpspi;
595 dmaengine_submit(desc_tx);
596 reinit_completion(&fsl_lpspi->dma_tx_completion);
597 dma_async_issue_pending(controller->dma_tx);
599 fsl_lpspi->slave_aborted = false;
601 if (!fsl_lpspi->is_slave) {
602 transfer_timeout = fsl_lpspi_calculate_timeout(fsl_lpspi,
605 /* Wait eDMA to finish the data transfer.*/
606 timeout = wait_for_completion_timeout(&fsl_lpspi->dma_tx_completion,
609 dev_err(fsl_lpspi->dev, "I/O Error in DMA TX\n");
610 dmaengine_terminate_all(controller->dma_tx);
611 dmaengine_terminate_all(controller->dma_rx);
612 fsl_lpspi_reset(fsl_lpspi);
616 timeout = wait_for_completion_timeout(&fsl_lpspi->dma_rx_completion,
619 dev_err(fsl_lpspi->dev, "I/O Error in DMA RX\n");
620 dmaengine_terminate_all(controller->dma_tx);
621 dmaengine_terminate_all(controller->dma_rx);
622 fsl_lpspi_reset(fsl_lpspi);
626 if (wait_for_completion_interruptible(&fsl_lpspi->dma_tx_completion) ||
627 fsl_lpspi->slave_aborted) {
628 dev_dbg(fsl_lpspi->dev,
629 "I/O Error in DMA TX interrupted\n");
630 dmaengine_terminate_all(controller->dma_tx);
631 dmaengine_terminate_all(controller->dma_rx);
632 fsl_lpspi_reset(fsl_lpspi);
636 if (wait_for_completion_interruptible(&fsl_lpspi->dma_rx_completion) ||
637 fsl_lpspi->slave_aborted) {
638 dev_dbg(fsl_lpspi->dev,
639 "I/O Error in DMA RX interrupted\n");
640 dmaengine_terminate_all(controller->dma_tx);
641 dmaengine_terminate_all(controller->dma_rx);
642 fsl_lpspi_reset(fsl_lpspi);
647 fsl_lpspi_reset(fsl_lpspi);
652 static void fsl_lpspi_dma_exit(struct spi_controller *controller)
654 if (controller->dma_rx) {
655 dma_release_channel(controller->dma_rx);
656 controller->dma_rx = NULL;
659 if (controller->dma_tx) {
660 dma_release_channel(controller->dma_tx);
661 controller->dma_tx = NULL;
665 static int fsl_lpspi_dma_init(struct device *dev,
666 struct fsl_lpspi_data *fsl_lpspi,
667 struct spi_controller *controller)
671 /* Prepare for TX DMA: */
672 controller->dma_tx = dma_request_slave_channel_reason(dev, "tx");
673 if (IS_ERR(controller->dma_tx)) {
674 ret = PTR_ERR(controller->dma_tx);
675 dev_dbg(dev, "can't get the TX DMA channel, error %d!\n", ret);
676 controller->dma_tx = NULL;
680 /* Prepare for RX DMA: */
681 controller->dma_rx = dma_request_slave_channel_reason(dev, "rx");
682 if (IS_ERR(controller->dma_rx)) {
683 ret = PTR_ERR(controller->dma_rx);
684 dev_dbg(dev, "can't get the RX DMA channel, error %d\n", ret);
685 controller->dma_rx = NULL;
689 init_completion(&fsl_lpspi->dma_rx_completion);
690 init_completion(&fsl_lpspi->dma_tx_completion);
691 controller->can_dma = fsl_lpspi_can_dma;
692 controller->max_dma_len = FSL_LPSPI_MAX_EDMA_BYTES;
696 fsl_lpspi_dma_exit(controller);
700 static int fsl_lpspi_pio_transfer(struct spi_controller *controller,
701 struct spi_transfer *t)
703 struct fsl_lpspi_data *fsl_lpspi =
704 spi_controller_get_devdata(controller);
707 fsl_lpspi->tx_buf = t->tx_buf;
708 fsl_lpspi->rx_buf = t->rx_buf;
709 fsl_lpspi->remain = t->len;
711 reinit_completion(&fsl_lpspi->xfer_done);
712 fsl_lpspi->slave_aborted = false;
714 fsl_lpspi_write_tx_fifo(fsl_lpspi);
716 ret = fsl_lpspi_wait_for_completion(controller);
720 fsl_lpspi_reset(fsl_lpspi);
725 static int fsl_lpspi_transfer_one(struct spi_controller *controller,
726 struct spi_device *spi,
727 struct spi_transfer *t)
729 struct fsl_lpspi_data *fsl_lpspi =
730 spi_controller_get_devdata(controller);
733 fsl_lpspi->is_first_byte = true;
734 ret = fsl_lpspi_setup_transfer(controller, spi, t);
738 fsl_lpspi_set_cmd(fsl_lpspi);
739 fsl_lpspi->is_first_byte = false;
741 if (fsl_lpspi->usedma)
742 ret = fsl_lpspi_dma_transfer(controller, fsl_lpspi, t);
744 ret = fsl_lpspi_pio_transfer(controller, t);
751 static irqreturn_t fsl_lpspi_isr(int irq, void *dev_id)
753 u32 temp_SR, temp_IER;
754 struct fsl_lpspi_data *fsl_lpspi = dev_id;
756 temp_IER = readl(fsl_lpspi->base + IMX7ULP_IER);
757 fsl_lpspi_intctrl(fsl_lpspi, 0);
758 temp_SR = readl(fsl_lpspi->base + IMX7ULP_SR);
760 fsl_lpspi_read_rx_fifo(fsl_lpspi);
762 if ((temp_SR & SR_TDF) && (temp_IER & IER_TDIE)) {
763 fsl_lpspi_write_tx_fifo(fsl_lpspi);
767 if (temp_SR & SR_MBF ||
768 readl(fsl_lpspi->base + IMX7ULP_FSR) & FSR_RXCOUNT) {
769 writel(SR_FCF, fsl_lpspi->base + IMX7ULP_SR);
770 fsl_lpspi_intctrl(fsl_lpspi, IER_FCIE);
774 if (temp_SR & SR_FCF && (temp_IER & IER_FCIE)) {
775 writel(SR_FCF, fsl_lpspi->base + IMX7ULP_SR);
776 complete(&fsl_lpspi->xfer_done);
783 static int fsl_lpspi_runtime_resume(struct device *dev)
785 struct fsl_lpspi_data *fsl_lpspi = dev_get_drvdata(dev);
788 ret = clk_prepare_enable(fsl_lpspi->clk_per);
792 ret = clk_prepare_enable(fsl_lpspi->clk_ipg);
794 clk_disable_unprepare(fsl_lpspi->clk_per);
801 static int fsl_lpspi_runtime_suspend(struct device *dev)
803 struct fsl_lpspi_data *fsl_lpspi = dev_get_drvdata(dev);
805 clk_disable_unprepare(fsl_lpspi->clk_per);
806 clk_disable_unprepare(fsl_lpspi->clk_ipg);
811 static int fsl_lpspi_init_rpm(struct fsl_lpspi_data *fsl_lpspi)
813 struct device *dev = fsl_lpspi->dev;
815 pm_runtime_enable(dev);
816 pm_runtime_set_autosuspend_delay(dev, FSL_LPSPI_RPM_TIMEOUT);
817 pm_runtime_use_autosuspend(dev);
822 static int fsl_lpspi_probe(struct platform_device *pdev)
824 struct device_node *np = pdev->dev.of_node;
825 struct fsl_lpspi_data *fsl_lpspi;
826 struct spi_controller *controller;
827 struct spi_imx_master *lpspi_platform_info =
828 dev_get_platdata(&pdev->dev);
829 struct resource *res;
833 if (of_property_read_bool((&pdev->dev)->of_node, "spi-slave"))
834 controller = spi_alloc_slave(&pdev->dev,
835 sizeof(struct fsl_lpspi_data));
837 controller = spi_alloc_master(&pdev->dev,
838 sizeof(struct fsl_lpspi_data));
843 platform_set_drvdata(pdev, controller);
845 controller->bits_per_word_mask = SPI_BPW_RANGE_MASK(8, 32);
846 controller->bus_num = pdev->id;
848 fsl_lpspi = spi_controller_get_devdata(controller);
849 fsl_lpspi->dev = &pdev->dev;
850 dev_set_drvdata(&pdev->dev, fsl_lpspi);
851 fsl_lpspi->is_slave = of_property_read_bool((&pdev->dev)->of_node,
854 if (!fsl_lpspi->is_slave) {
855 for (i = 0; i < controller->num_chipselect; i++) {
856 int cs_gpio = of_get_named_gpio(np, "cs-gpios", i);
858 if (!gpio_is_valid(cs_gpio) && lpspi_platform_info)
859 cs_gpio = lpspi_platform_info->chipselect[i];
861 fsl_lpspi->chipselect[i] = cs_gpio;
862 if (!gpio_is_valid(cs_gpio))
865 ret = devm_gpio_request(&pdev->dev,
866 fsl_lpspi->chipselect[i],
869 dev_err(&pdev->dev, "can't get cs gpios\n");
870 goto out_controller_put;
873 controller->cs_gpios = fsl_lpspi->chipselect;
874 controller->prepare_message = fsl_lpspi_prepare_message;
877 controller->transfer_one = fsl_lpspi_transfer_one;
878 controller->prepare_transfer_hardware = lpspi_prepare_xfer_hardware;
879 controller->unprepare_transfer_hardware = lpspi_unprepare_xfer_hardware;
880 controller->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
881 controller->flags = SPI_MASTER_MUST_RX | SPI_MASTER_MUST_TX;
882 controller->dev.of_node = pdev->dev.of_node;
883 controller->bus_num = pdev->id;
884 controller->slave_abort = fsl_lpspi_slave_abort;
886 init_completion(&fsl_lpspi->xfer_done);
888 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
889 fsl_lpspi->base = devm_ioremap_resource(&pdev->dev, res);
890 if (IS_ERR(fsl_lpspi->base)) {
891 ret = PTR_ERR(fsl_lpspi->base);
892 goto out_controller_put;
894 fsl_lpspi->base_phys = res->start;
896 irq = platform_get_irq(pdev, 0);
899 goto out_controller_put;
902 ret = devm_request_irq(&pdev->dev, irq, fsl_lpspi_isr, 0,
903 dev_name(&pdev->dev), fsl_lpspi);
905 dev_err(&pdev->dev, "can't get irq%d: %d\n", irq, ret);
906 goto out_controller_put;
909 fsl_lpspi->clk_per = devm_clk_get(&pdev->dev, "per");
910 if (IS_ERR(fsl_lpspi->clk_per)) {
911 ret = PTR_ERR(fsl_lpspi->clk_per);
912 goto out_controller_put;
915 fsl_lpspi->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
916 if (IS_ERR(fsl_lpspi->clk_ipg)) {
917 ret = PTR_ERR(fsl_lpspi->clk_ipg);
918 goto out_controller_put;
921 /* enable the clock */
922 ret = fsl_lpspi_init_rpm(fsl_lpspi);
924 goto out_controller_put;
926 ret = pm_runtime_get_sync(fsl_lpspi->dev);
928 dev_err(fsl_lpspi->dev, "failed to enable clock\n");
932 temp = readl(fsl_lpspi->base + IMX7ULP_PARAM);
933 fsl_lpspi->txfifosize = 1 << (temp & 0x0f);
934 fsl_lpspi->rxfifosize = 1 << ((temp >> 8) & 0x0f);
936 ret = fsl_lpspi_dma_init(&pdev->dev, fsl_lpspi, controller);
937 if (ret == -EPROBE_DEFER)
938 goto out_controller_put;
941 dev_err(&pdev->dev, "dma setup error %d, use pio\n", ret);
943 ret = devm_spi_register_controller(&pdev->dev, controller);
945 dev_err(&pdev->dev, "spi_register_controller error.\n");
946 goto out_controller_put;
952 spi_controller_put(controller);
957 static int fsl_lpspi_remove(struct platform_device *pdev)
959 struct spi_controller *controller = platform_get_drvdata(pdev);
960 struct fsl_lpspi_data *fsl_lpspi =
961 spi_controller_get_devdata(controller);
963 pm_runtime_disable(fsl_lpspi->dev);
965 spi_master_put(controller);
970 #ifdef CONFIG_PM_SLEEP
971 static int fsl_lpspi_suspend(struct device *dev)
975 pinctrl_pm_select_sleep_state(dev);
976 ret = pm_runtime_force_suspend(dev);
980 static int fsl_lpspi_resume(struct device *dev)
984 ret = pm_runtime_force_resume(dev);
986 dev_err(dev, "Error in resume: %d\n", ret);
990 pinctrl_pm_select_default_state(dev);
994 #endif /* CONFIG_PM_SLEEP */
996 static const struct dev_pm_ops fsl_lpspi_pm_ops = {
997 SET_RUNTIME_PM_OPS(fsl_lpspi_runtime_suspend,
998 fsl_lpspi_runtime_resume, NULL)
999 SET_SYSTEM_SLEEP_PM_OPS(fsl_lpspi_suspend, fsl_lpspi_resume)
1002 static struct platform_driver fsl_lpspi_driver = {
1004 .name = DRIVER_NAME,
1005 .of_match_table = fsl_lpspi_dt_ids,
1006 .pm = &fsl_lpspi_pm_ops,
1008 .probe = fsl_lpspi_probe,
1009 .remove = fsl_lpspi_remove,
1011 module_platform_driver(fsl_lpspi_driver);
1013 MODULE_DESCRIPTION("LPSPI Controller driver");
1014 MODULE_AUTHOR("Gao Pan <pandy.gao@nxp.com>");
1015 MODULE_LICENSE("GPL");