2 * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
3 * Author: Addy Ke <addy.ke@rock-chips.com>
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 #include <linux/clk.h>
17 #include <linux/dmaengine.h>
18 #include <linux/module.h>
20 #include <linux/platform_device.h>
21 #include <linux/spi/spi.h>
22 #include <linux/pm_runtime.h>
23 #include <linux/scatterlist.h>
25 #define DRIVER_NAME "rockchip-spi"
27 /* SPI register offsets */
28 #define ROCKCHIP_SPI_CTRLR0 0x0000
29 #define ROCKCHIP_SPI_CTRLR1 0x0004
30 #define ROCKCHIP_SPI_SSIENR 0x0008
31 #define ROCKCHIP_SPI_SER 0x000c
32 #define ROCKCHIP_SPI_BAUDR 0x0010
33 #define ROCKCHIP_SPI_TXFTLR 0x0014
34 #define ROCKCHIP_SPI_RXFTLR 0x0018
35 #define ROCKCHIP_SPI_TXFLR 0x001c
36 #define ROCKCHIP_SPI_RXFLR 0x0020
37 #define ROCKCHIP_SPI_SR 0x0024
38 #define ROCKCHIP_SPI_IPR 0x0028
39 #define ROCKCHIP_SPI_IMR 0x002c
40 #define ROCKCHIP_SPI_ISR 0x0030
41 #define ROCKCHIP_SPI_RISR 0x0034
42 #define ROCKCHIP_SPI_ICR 0x0038
43 #define ROCKCHIP_SPI_DMACR 0x003c
44 #define ROCKCHIP_SPI_DMATDLR 0x0040
45 #define ROCKCHIP_SPI_DMARDLR 0x0044
46 #define ROCKCHIP_SPI_TXDR 0x0400
47 #define ROCKCHIP_SPI_RXDR 0x0800
49 /* Bit fields in CTRLR0 */
50 #define CR0_DFS_OFFSET 0
52 #define CR0_CFS_OFFSET 2
54 #define CR0_SCPH_OFFSET 6
56 #define CR0_SCPOL_OFFSET 7
58 #define CR0_CSM_OFFSET 8
59 #define CR0_CSM_KEEP 0x0
60 /* ss_n be high for half sclk_out cycles */
61 #define CR0_CSM_HALF 0X1
62 /* ss_n be high for one sclk_out cycle */
63 #define CR0_CSM_ONE 0x2
65 /* ss_n to sclk_out delay */
66 #define CR0_SSD_OFFSET 10
68 * The period between ss_n active and
69 * sclk_out active is half sclk_out cycles
71 #define CR0_SSD_HALF 0x0
73 * The period between ss_n active and
74 * sclk_out active is one sclk_out cycle
76 #define CR0_SSD_ONE 0x1
78 #define CR0_EM_OFFSET 11
79 #define CR0_EM_LITTLE 0x0
80 #define CR0_EM_BIG 0x1
82 #define CR0_FBM_OFFSET 12
83 #define CR0_FBM_MSB 0x0
84 #define CR0_FBM_LSB 0x1
86 #define CR0_BHT_OFFSET 13
87 #define CR0_BHT_16BIT 0x0
88 #define CR0_BHT_8BIT 0x1
90 #define CR0_RSD_OFFSET 14
92 #define CR0_FRF_OFFSET 16
93 #define CR0_FRF_SPI 0x0
94 #define CR0_FRF_SSP 0x1
95 #define CR0_FRF_MICROWIRE 0x2
97 #define CR0_XFM_OFFSET 18
98 #define CR0_XFM_MASK (0x03 << SPI_XFM_OFFSET)
99 #define CR0_XFM_TR 0x0
100 #define CR0_XFM_TO 0x1
101 #define CR0_XFM_RO 0x2
103 #define CR0_OPM_OFFSET 20
104 #define CR0_OPM_MASTER 0x0
105 #define CR0_OPM_SLAVE 0x1
107 #define CR0_MTM_OFFSET 0x21
109 /* Bit fields in SER, 2bit */
112 /* Bit fields in SR, 5bit */
114 #define SR_BUSY (1 << 0)
115 #define SR_TF_FULL (1 << 1)
116 #define SR_TF_EMPTY (1 << 2)
117 #define SR_RF_EMPTY (1 << 3)
118 #define SR_RF_FULL (1 << 4)
120 /* Bit fields in ISR, IMR, ISR, RISR, 5bit */
121 #define INT_MASK 0x1f
122 #define INT_TF_EMPTY (1 << 0)
123 #define INT_TF_OVERFLOW (1 << 1)
124 #define INT_RF_UNDERFLOW (1 << 2)
125 #define INT_RF_OVERFLOW (1 << 3)
126 #define INT_RF_FULL (1 << 4)
128 /* Bit fields in ICR, 4bit */
129 #define ICR_MASK 0x0f
130 #define ICR_ALL (1 << 0)
131 #define ICR_RF_UNDERFLOW (1 << 1)
132 #define ICR_RF_OVERFLOW (1 << 2)
133 #define ICR_TF_OVERFLOW (1 << 3)
135 /* Bit fields in DMACR */
136 #define RF_DMA_EN (1 << 0)
137 #define TF_DMA_EN (1 << 1)
139 #define RXBUSY (1 << 0)
140 #define TXBUSY (1 << 1)
142 /* sclk_out: spi master internal logic in rk3x can support 50Mhz */
143 #define MAX_SCLK_OUT 50000000
145 enum rockchip_ssi_type {
151 struct rockchip_spi_dma_data {
153 enum dma_transfer_direction direction;
157 struct rockchip_spi {
159 struct spi_master *master;
162 struct clk *apb_pclk;
165 /*depth of the FIFO buffer */
167 /* max bus freq supported */
169 /* supported slave numbers */
170 enum rockchip_ssi_type type;
190 struct sg_table tx_sg;
191 struct sg_table rx_sg;
192 struct rockchip_spi_dma_data dma_rx;
193 struct rockchip_spi_dma_data dma_tx;
196 static inline void spi_enable_chip(struct rockchip_spi *rs, int enable)
198 writel_relaxed((enable ? 1 : 0), rs->regs + ROCKCHIP_SPI_SSIENR);
201 static inline void spi_set_clk(struct rockchip_spi *rs, u16 div)
203 writel_relaxed(div, rs->regs + ROCKCHIP_SPI_BAUDR);
206 static inline void flush_fifo(struct rockchip_spi *rs)
208 while (readl_relaxed(rs->regs + ROCKCHIP_SPI_RXFLR))
209 readl_relaxed(rs->regs + ROCKCHIP_SPI_RXDR);
212 static inline void wait_for_idle(struct rockchip_spi *rs)
214 unsigned long timeout = jiffies + msecs_to_jiffies(5);
217 if (!(readl_relaxed(rs->regs + ROCKCHIP_SPI_SR) & SR_BUSY))
219 } while (!time_after(jiffies, timeout));
221 dev_warn(rs->dev, "spi controller is in busy state!\n");
224 static u32 get_fifo_len(struct rockchip_spi *rs)
228 for (fifo = 2; fifo < 32; fifo++) {
229 writel_relaxed(fifo, rs->regs + ROCKCHIP_SPI_TXFTLR);
230 if (fifo != readl_relaxed(rs->regs + ROCKCHIP_SPI_TXFTLR))
234 writel_relaxed(0, rs->regs + ROCKCHIP_SPI_TXFTLR);
236 return (fifo == 31) ? 0 : fifo;
239 static inline u32 tx_max(struct rockchip_spi *rs)
241 u32 tx_left, tx_room;
243 tx_left = (rs->tx_end - rs->tx) / rs->n_bytes;
244 tx_room = rs->fifo_len - readl_relaxed(rs->regs + ROCKCHIP_SPI_TXFLR);
246 return min(tx_left, tx_room);
249 static inline u32 rx_max(struct rockchip_spi *rs)
251 u32 rx_left = (rs->rx_end - rs->rx) / rs->n_bytes;
252 u32 rx_room = (u32)readl_relaxed(rs->regs + ROCKCHIP_SPI_RXFLR);
254 return min(rx_left, rx_room);
257 static void rockchip_spi_set_cs(struct spi_device *spi, bool enable)
260 struct spi_master *master = spi->master;
261 struct rockchip_spi *rs = spi_master_get_devdata(master);
263 pm_runtime_get_sync(rs->dev);
265 ser = readl_relaxed(rs->regs + ROCKCHIP_SPI_SER) & SER_MASK;
269 * static void spi_set_cs(struct spi_device *spi, bool enable)
271 * if (spi->mode & SPI_CS_HIGH)
274 * if (spi->cs_gpio >= 0)
275 * gpio_set_value(spi->cs_gpio, !enable);
276 * else if (spi->master->set_cs)
277 * spi->master->set_cs(spi, !enable);
280 * Note: enable(rockchip_spi_set_cs) = !enable(spi_set_cs)
283 ser |= 1 << spi->chip_select;
285 ser &= ~(1 << spi->chip_select);
287 writel_relaxed(ser, rs->regs + ROCKCHIP_SPI_SER);
289 pm_runtime_put_sync(rs->dev);
292 static int rockchip_spi_prepare_message(struct spi_master *master,
293 struct spi_message *msg)
295 struct rockchip_spi *rs = spi_master_get_devdata(master);
296 struct spi_device *spi = msg->spi;
298 rs->mode = spi->mode;
303 static void rockchip_spi_handle_err(struct spi_master *master,
304 struct spi_message *msg)
307 struct rockchip_spi *rs = spi_master_get_devdata(master);
309 spin_lock_irqsave(&rs->lock, flags);
312 * For DMA mode, we need terminate DMA channel and flush
313 * fifo for the next transfer if DMA thansfer timeout.
314 * handle_err() was called by core if transfer failed.
315 * Maybe it is reasonable for error handling here.
318 if (rs->state & RXBUSY) {
319 dmaengine_terminate_async(rs->dma_rx.ch);
323 if (rs->state & TXBUSY)
324 dmaengine_terminate_async(rs->dma_tx.ch);
327 spin_unlock_irqrestore(&rs->lock, flags);
330 static int rockchip_spi_unprepare_message(struct spi_master *master,
331 struct spi_message *msg)
333 struct rockchip_spi *rs = spi_master_get_devdata(master);
335 spi_enable_chip(rs, 0);
340 static void rockchip_spi_pio_writer(struct rockchip_spi *rs)
342 u32 max = tx_max(rs);
346 if (rs->n_bytes == 1)
347 txw = *(u8 *)(rs->tx);
349 txw = *(u16 *)(rs->tx);
351 writel_relaxed(txw, rs->regs + ROCKCHIP_SPI_TXDR);
352 rs->tx += rs->n_bytes;
356 static void rockchip_spi_pio_reader(struct rockchip_spi *rs)
358 u32 max = rx_max(rs);
362 rxw = readl_relaxed(rs->regs + ROCKCHIP_SPI_RXDR);
363 if (rs->n_bytes == 1)
364 *(u8 *)(rs->rx) = (u8)rxw;
366 *(u16 *)(rs->rx) = (u16)rxw;
367 rs->rx += rs->n_bytes;
371 static int rockchip_spi_pio_transfer(struct rockchip_spi *rs)
377 remain = rs->tx_end - rs->tx;
378 rockchip_spi_pio_writer(rs);
382 remain = rs->rx_end - rs->rx;
383 rockchip_spi_pio_reader(rs);
389 /* If tx, wait until the FIFO data completely. */
393 spi_enable_chip(rs, 0);
398 static void rockchip_spi_dma_rxcb(void *data)
401 struct rockchip_spi *rs = data;
403 spin_lock_irqsave(&rs->lock, flags);
405 rs->state &= ~RXBUSY;
406 if (!(rs->state & TXBUSY)) {
407 spi_enable_chip(rs, 0);
408 spi_finalize_current_transfer(rs->master);
411 spin_unlock_irqrestore(&rs->lock, flags);
414 static void rockchip_spi_dma_txcb(void *data)
417 struct rockchip_spi *rs = data;
419 /* Wait until the FIFO data completely. */
422 spin_lock_irqsave(&rs->lock, flags);
424 rs->state &= ~TXBUSY;
425 if (!(rs->state & RXBUSY)) {
426 spi_enable_chip(rs, 0);
427 spi_finalize_current_transfer(rs->master);
430 spin_unlock_irqrestore(&rs->lock, flags);
433 static int rockchip_spi_prepare_dma(struct rockchip_spi *rs)
436 struct dma_slave_config rxconf, txconf;
437 struct dma_async_tx_descriptor *rxdesc, *txdesc;
439 spin_lock_irqsave(&rs->lock, flags);
440 rs->state &= ~RXBUSY;
441 rs->state &= ~TXBUSY;
442 spin_unlock_irqrestore(&rs->lock, flags);
446 rxconf.direction = rs->dma_rx.direction;
447 rxconf.src_addr = rs->dma_rx.addr;
448 rxconf.src_addr_width = rs->n_bytes;
449 rxconf.src_maxburst = rs->n_bytes;
450 dmaengine_slave_config(rs->dma_rx.ch, &rxconf);
452 rxdesc = dmaengine_prep_slave_sg(
454 rs->rx_sg.sgl, rs->rx_sg.nents,
455 rs->dma_rx.direction, DMA_PREP_INTERRUPT);
459 rxdesc->callback = rockchip_spi_dma_rxcb;
460 rxdesc->callback_param = rs;
465 txconf.direction = rs->dma_tx.direction;
466 txconf.dst_addr = rs->dma_tx.addr;
467 txconf.dst_addr_width = rs->n_bytes;
468 txconf.dst_maxburst = rs->n_bytes;
469 dmaengine_slave_config(rs->dma_tx.ch, &txconf);
471 txdesc = dmaengine_prep_slave_sg(
473 rs->tx_sg.sgl, rs->tx_sg.nents,
474 rs->dma_tx.direction, DMA_PREP_INTERRUPT);
477 dmaengine_terminate_sync(rs->dma_rx.ch);
481 txdesc->callback = rockchip_spi_dma_txcb;
482 txdesc->callback_param = rs;
485 /* rx must be started before tx due to spi instinct */
487 spin_lock_irqsave(&rs->lock, flags);
489 spin_unlock_irqrestore(&rs->lock, flags);
490 dmaengine_submit(rxdesc);
491 dma_async_issue_pending(rs->dma_rx.ch);
495 spin_lock_irqsave(&rs->lock, flags);
497 spin_unlock_irqrestore(&rs->lock, flags);
498 dmaengine_submit(txdesc);
499 dma_async_issue_pending(rs->dma_tx.ch);
505 static void rockchip_spi_config(struct rockchip_spi *rs)
511 u32 cr0 = (CR0_BHT_8BIT << CR0_BHT_OFFSET)
512 | (CR0_SSD_ONE << CR0_SSD_OFFSET)
513 | (CR0_EM_BIG << CR0_EM_OFFSET);
515 cr0 |= (rs->n_bytes << CR0_DFS_OFFSET);
516 cr0 |= ((rs->mode & 0x3) << CR0_SCPH_OFFSET);
517 cr0 |= (rs->tmode << CR0_XFM_OFFSET);
518 cr0 |= (rs->type << CR0_FRF_OFFSET);
527 if (WARN_ON(rs->speed > MAX_SCLK_OUT))
528 rs->speed = MAX_SCLK_OUT;
530 /* the minimum divsor is 2 */
531 if (rs->max_freq < 2 * rs->speed) {
532 clk_set_rate(rs->spiclk, 2 * rs->speed);
533 rs->max_freq = clk_get_rate(rs->spiclk);
536 /* div doesn't support odd number */
537 div = DIV_ROUND_UP(rs->max_freq, rs->speed);
538 div = (div + 1) & 0xfffe;
540 /* Rx sample delay is expressed in parent clock cycles (max 3) */
541 rsd = DIV_ROUND_CLOSEST(rs->rsd_nsecs * (rs->max_freq >> 8),
543 if (!rsd && rs->rsd_nsecs) {
544 pr_warn_once("rockchip-spi: %u Hz are too slow to express %u ns delay\n",
545 rs->max_freq, rs->rsd_nsecs);
546 } else if (rsd > 3) {
548 pr_warn_once("rockchip-spi: %u Hz are too fast to express %u ns delay, clamping at %u ns\n",
549 rs->max_freq, rs->rsd_nsecs,
550 rsd * 1000000000U / rs->max_freq);
552 cr0 |= rsd << CR0_RSD_OFFSET;
554 writel_relaxed(cr0, rs->regs + ROCKCHIP_SPI_CTRLR0);
556 writel_relaxed(rs->len - 1, rs->regs + ROCKCHIP_SPI_CTRLR1);
557 writel_relaxed(rs->fifo_len / 2 - 1, rs->regs + ROCKCHIP_SPI_TXFTLR);
558 writel_relaxed(rs->fifo_len / 2 - 1, rs->regs + ROCKCHIP_SPI_RXFTLR);
560 writel_relaxed(0, rs->regs + ROCKCHIP_SPI_DMATDLR);
561 writel_relaxed(0, rs->regs + ROCKCHIP_SPI_DMARDLR);
562 writel_relaxed(dmacr, rs->regs + ROCKCHIP_SPI_DMACR);
564 spi_set_clk(rs, div);
566 dev_dbg(rs->dev, "cr0 0x%x, div %d\n", cr0, div);
569 static int rockchip_spi_transfer_one(
570 struct spi_master *master,
571 struct spi_device *spi,
572 struct spi_transfer *xfer)
575 struct rockchip_spi *rs = spi_master_get_devdata(master);
577 WARN_ON(readl_relaxed(rs->regs + ROCKCHIP_SPI_SSIENR) &&
578 (readl_relaxed(rs->regs + ROCKCHIP_SPI_SR) & SR_BUSY));
580 if (!xfer->tx_buf && !xfer->rx_buf) {
581 dev_err(rs->dev, "No buffer for transfer\n");
585 rs->speed = xfer->speed_hz;
586 rs->bpw = xfer->bits_per_word;
587 rs->n_bytes = rs->bpw >> 3;
589 rs->tx = xfer->tx_buf;
590 rs->tx_end = rs->tx + xfer->len;
591 rs->rx = xfer->rx_buf;
592 rs->rx_end = rs->rx + xfer->len;
595 rs->tx_sg = xfer->tx_sg;
596 rs->rx_sg = xfer->rx_sg;
598 if (rs->tx && rs->rx)
599 rs->tmode = CR0_XFM_TR;
601 rs->tmode = CR0_XFM_TO;
603 rs->tmode = CR0_XFM_RO;
605 /* we need prepare dma before spi was enabled */
606 if (master->can_dma && master->can_dma(master, spi, xfer))
611 rockchip_spi_config(rs);
614 if (rs->tmode == CR0_XFM_RO) {
615 /* rx: dma must be prepared first */
616 ret = rockchip_spi_prepare_dma(rs);
617 spi_enable_chip(rs, 1);
619 /* tx or tr: spi must be enabled first */
620 spi_enable_chip(rs, 1);
621 ret = rockchip_spi_prepare_dma(rs);
624 spi_enable_chip(rs, 1);
625 ret = rockchip_spi_pio_transfer(rs);
631 static bool rockchip_spi_can_dma(struct spi_master *master,
632 struct spi_device *spi,
633 struct spi_transfer *xfer)
635 struct rockchip_spi *rs = spi_master_get_devdata(master);
637 return (xfer->len > rs->fifo_len);
640 static int rockchip_spi_probe(struct platform_device *pdev)
643 struct rockchip_spi *rs;
644 struct spi_master *master;
645 struct resource *mem;
648 master = spi_alloc_master(&pdev->dev, sizeof(struct rockchip_spi));
652 platform_set_drvdata(pdev, master);
654 rs = spi_master_get_devdata(master);
656 /* Get basic io resource and map it */
657 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
658 rs->regs = devm_ioremap_resource(&pdev->dev, mem);
659 if (IS_ERR(rs->regs)) {
660 ret = PTR_ERR(rs->regs);
661 goto err_ioremap_resource;
664 rs->apb_pclk = devm_clk_get(&pdev->dev, "apb_pclk");
665 if (IS_ERR(rs->apb_pclk)) {
666 dev_err(&pdev->dev, "Failed to get apb_pclk\n");
667 ret = PTR_ERR(rs->apb_pclk);
668 goto err_ioremap_resource;
671 rs->spiclk = devm_clk_get(&pdev->dev, "spiclk");
672 if (IS_ERR(rs->spiclk)) {
673 dev_err(&pdev->dev, "Failed to get spi_pclk\n");
674 ret = PTR_ERR(rs->spiclk);
675 goto err_ioremap_resource;
678 ret = clk_prepare_enable(rs->apb_pclk);
680 dev_err(&pdev->dev, "Failed to enable apb_pclk\n");
681 goto err_ioremap_resource;
684 ret = clk_prepare_enable(rs->spiclk);
686 dev_err(&pdev->dev, "Failed to enable spi_clk\n");
687 goto err_spiclk_enable;
690 spi_enable_chip(rs, 0);
692 rs->type = SSI_MOTO_SPI;
694 rs->dev = &pdev->dev;
695 rs->max_freq = clk_get_rate(rs->spiclk);
697 if (!of_property_read_u32(pdev->dev.of_node, "rx-sample-delay-ns",
699 rs->rsd_nsecs = rsd_nsecs;
701 rs->fifo_len = get_fifo_len(rs);
703 dev_err(&pdev->dev, "Failed to get fifo length\n");
705 goto err_get_fifo_len;
708 spin_lock_init(&rs->lock);
710 pm_runtime_set_active(&pdev->dev);
711 pm_runtime_enable(&pdev->dev);
713 master->auto_runtime_pm = true;
714 master->bus_num = pdev->id;
715 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LOOP;
716 master->num_chipselect = 2;
717 master->dev.of_node = pdev->dev.of_node;
718 master->bits_per_word_mask = SPI_BPW_MASK(16) | SPI_BPW_MASK(8);
720 master->set_cs = rockchip_spi_set_cs;
721 master->prepare_message = rockchip_spi_prepare_message;
722 master->unprepare_message = rockchip_spi_unprepare_message;
723 master->transfer_one = rockchip_spi_transfer_one;
724 master->handle_err = rockchip_spi_handle_err;
726 rs->dma_tx.ch = dma_request_slave_channel(rs->dev, "tx");
727 if (IS_ERR_OR_NULL(rs->dma_tx.ch)) {
728 /* Check tx to see if we need defer probing driver */
729 if (PTR_ERR(rs->dma_tx.ch) == -EPROBE_DEFER) {
731 goto err_get_fifo_len;
733 dev_warn(rs->dev, "Failed to request TX DMA channel\n");
736 rs->dma_rx.ch = dma_request_slave_channel(rs->dev, "rx");
737 if (!rs->dma_rx.ch) {
739 dma_release_channel(rs->dma_tx.ch);
740 rs->dma_tx.ch = NULL;
742 dev_warn(rs->dev, "Failed to request RX DMA channel\n");
745 if (rs->dma_tx.ch && rs->dma_rx.ch) {
746 rs->dma_tx.addr = (dma_addr_t)(mem->start + ROCKCHIP_SPI_TXDR);
747 rs->dma_rx.addr = (dma_addr_t)(mem->start + ROCKCHIP_SPI_RXDR);
748 rs->dma_tx.direction = DMA_MEM_TO_DEV;
749 rs->dma_rx.direction = DMA_DEV_TO_MEM;
751 master->can_dma = rockchip_spi_can_dma;
752 master->dma_tx = rs->dma_tx.ch;
753 master->dma_rx = rs->dma_rx.ch;
756 ret = devm_spi_register_master(&pdev->dev, master);
758 dev_err(&pdev->dev, "Failed to register master\n");
759 goto err_register_master;
765 pm_runtime_disable(&pdev->dev);
767 dma_release_channel(rs->dma_tx.ch);
769 dma_release_channel(rs->dma_rx.ch);
771 clk_disable_unprepare(rs->spiclk);
773 clk_disable_unprepare(rs->apb_pclk);
774 err_ioremap_resource:
775 spi_master_put(master);
780 static int rockchip_spi_remove(struct platform_device *pdev)
782 struct spi_master *master = spi_master_get(platform_get_drvdata(pdev));
783 struct rockchip_spi *rs = spi_master_get_devdata(master);
785 pm_runtime_disable(&pdev->dev);
787 clk_disable_unprepare(rs->spiclk);
788 clk_disable_unprepare(rs->apb_pclk);
791 dma_release_channel(rs->dma_tx.ch);
793 dma_release_channel(rs->dma_rx.ch);
795 spi_master_put(master);
800 #ifdef CONFIG_PM_SLEEP
801 static int rockchip_spi_suspend(struct device *dev)
804 struct spi_master *master = dev_get_drvdata(dev);
805 struct rockchip_spi *rs = spi_master_get_devdata(master);
807 ret = spi_master_suspend(rs->master);
811 if (!pm_runtime_suspended(dev)) {
812 clk_disable_unprepare(rs->spiclk);
813 clk_disable_unprepare(rs->apb_pclk);
819 static int rockchip_spi_resume(struct device *dev)
822 struct spi_master *master = dev_get_drvdata(dev);
823 struct rockchip_spi *rs = spi_master_get_devdata(master);
825 if (!pm_runtime_suspended(dev)) {
826 ret = clk_prepare_enable(rs->apb_pclk);
830 ret = clk_prepare_enable(rs->spiclk);
832 clk_disable_unprepare(rs->apb_pclk);
837 ret = spi_master_resume(rs->master);
839 clk_disable_unprepare(rs->spiclk);
840 clk_disable_unprepare(rs->apb_pclk);
845 #endif /* CONFIG_PM_SLEEP */
848 static int rockchip_spi_runtime_suspend(struct device *dev)
850 struct spi_master *master = dev_get_drvdata(dev);
851 struct rockchip_spi *rs = spi_master_get_devdata(master);
853 clk_disable_unprepare(rs->spiclk);
854 clk_disable_unprepare(rs->apb_pclk);
859 static int rockchip_spi_runtime_resume(struct device *dev)
862 struct spi_master *master = dev_get_drvdata(dev);
863 struct rockchip_spi *rs = spi_master_get_devdata(master);
865 ret = clk_prepare_enable(rs->apb_pclk);
869 ret = clk_prepare_enable(rs->spiclk);
871 clk_disable_unprepare(rs->apb_pclk);
875 #endif /* CONFIG_PM */
877 static const struct dev_pm_ops rockchip_spi_pm = {
878 SET_SYSTEM_SLEEP_PM_OPS(rockchip_spi_suspend, rockchip_spi_resume)
879 SET_RUNTIME_PM_OPS(rockchip_spi_runtime_suspend,
880 rockchip_spi_runtime_resume, NULL)
883 static const struct of_device_id rockchip_spi_dt_match[] = {
884 { .compatible = "rockchip,rk3066-spi", },
885 { .compatible = "rockchip,rk3188-spi", },
886 { .compatible = "rockchip,rk3288-spi", },
887 { .compatible = "rockchip,rk3399-spi", },
890 MODULE_DEVICE_TABLE(of, rockchip_spi_dt_match);
892 static struct platform_driver rockchip_spi_driver = {
895 .pm = &rockchip_spi_pm,
896 .of_match_table = of_match_ptr(rockchip_spi_dt_match),
898 .probe = rockchip_spi_probe,
899 .remove = rockchip_spi_remove,
902 module_platform_driver(rockchip_spi_driver);
904 MODULE_AUTHOR("Addy Ke <addy.ke@rock-chips.com>");
905 MODULE_DESCRIPTION("ROCKCHIP SPI Controller Driver");
906 MODULE_LICENSE("GPL v2");