1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) STMicroelectronics 2018 - All Rights Reserved
4 * Author: Ludovic Barre <ludovic.barre@st.com> for STMicroelectronics.
6 #include <linux/bitfield.h>
8 #include <linux/dmaengine.h>
9 #include <linux/dma-mapping.h>
10 #include <linux/errno.h>
12 #include <linux/iopoll.h>
13 #include <linux/interrupt.h>
14 #include <linux/module.h>
15 #include <linux/mutex.h>
17 #include <linux/of_device.h>
18 #include <linux/pinctrl/consumer.h>
19 #include <linux/pm_runtime.h>
20 #include <linux/platform_device.h>
21 #include <linux/reset.h>
22 #include <linux/sizes.h>
23 #include <linux/spi/spi-mem.h>
27 #define CR_ABORT BIT(1)
28 #define CR_DMAEN BIT(2)
29 #define CR_TCEN BIT(3)
30 #define CR_SSHIFT BIT(4)
32 #define CR_FSEL BIT(7)
33 #define CR_FTHRES_SHIFT 8
34 #define CR_TEIE BIT(16)
35 #define CR_TCIE BIT(17)
36 #define CR_FTIE BIT(18)
37 #define CR_SMIE BIT(19)
38 #define CR_TOIE BIT(20)
39 #define CR_APMS BIT(22)
40 #define CR_PRESC_MASK GENMASK(31, 24)
43 #define DCR_FSIZE_MASK GENMASK(20, 16)
51 #define SR_BUSY BIT(5)
52 #define SR_FLEVEL_MASK GENMASK(13, 8)
55 #define FCR_CTEF BIT(0)
56 #define FCR_CTCF BIT(1)
57 #define FCR_CSMF BIT(3)
62 #define CCR_INST_MASK GENMASK(7, 0)
63 #define CCR_IMODE_MASK GENMASK(9, 8)
64 #define CCR_ADMODE_MASK GENMASK(11, 10)
65 #define CCR_ADSIZE_MASK GENMASK(13, 12)
66 #define CCR_DCYC_MASK GENMASK(22, 18)
67 #define CCR_DMODE_MASK GENMASK(25, 24)
68 #define CCR_FMODE_MASK GENMASK(27, 26)
69 #define CCR_FMODE_INDW (0U << 26)
70 #define CCR_FMODE_INDR (1U << 26)
71 #define CCR_FMODE_APM (2U << 26)
72 #define CCR_FMODE_MM (3U << 26)
73 #define CCR_BUSWIDTH_0 0x0
74 #define CCR_BUSWIDTH_1 0x1
75 #define CCR_BUSWIDTH_2 0x2
76 #define CCR_BUSWIDTH_4 0x3
81 #define QSPI_PSMKR 0x24
82 #define QSPI_PSMAR 0x28
84 #define QSPI_LPTR 0x30
86 #define STM32_QSPI_MAX_MMAP_SZ SZ_256M
87 #define STM32_QSPI_MAX_NORCHIP 2
89 #define STM32_FIFO_TIMEOUT_US 30000
90 #define STM32_BUSY_TIMEOUT_US 100000
91 #define STM32_ABT_TIMEOUT_US 100000
92 #define STM32_COMP_TIMEOUT_MS 1000
93 #define STM32_AUTOSUSPEND_DELAY -1
95 struct stm32_qspi_flash {
102 struct spi_controller *ctrl;
103 phys_addr_t phys_base;
104 void __iomem *io_base;
105 void __iomem *mm_base;
106 resource_size_t mm_size;
109 struct stm32_qspi_flash flash[STM32_QSPI_MAX_NORCHIP];
110 struct completion data_completion;
111 struct completion match_completion;
114 struct dma_chan *dma_chtx;
115 struct dma_chan *dma_chrx;
116 struct completion dma_completion;
120 unsigned long status_timeout;
123 * to protect device configuration, could be different between
124 * 2 flash access (bk1, bk2)
129 static irqreturn_t stm32_qspi_irq(int irq, void *dev_id)
131 struct stm32_qspi *qspi = (struct stm32_qspi *)dev_id;
134 cr = readl_relaxed(qspi->io_base + QSPI_CR);
135 sr = readl_relaxed(qspi->io_base + QSPI_SR);
137 if (cr & CR_SMIE && sr & SR_SMF) {
140 writel_relaxed(cr, qspi->io_base + QSPI_CR);
141 complete(&qspi->match_completion);
146 if (sr & (SR_TEF | SR_TCF)) {
148 cr &= ~CR_TCIE & ~CR_TEIE;
149 writel_relaxed(cr, qspi->io_base + QSPI_CR);
150 complete(&qspi->data_completion);
156 static void stm32_qspi_read_fifo(u8 *val, void __iomem *addr)
158 *val = readb_relaxed(addr);
161 static void stm32_qspi_write_fifo(u8 *val, void __iomem *addr)
163 writeb_relaxed(*val, addr);
166 static int stm32_qspi_tx_poll(struct stm32_qspi *qspi,
167 const struct spi_mem_op *op)
169 void (*tx_fifo)(u8 *val, void __iomem *addr);
170 u32 len = op->data.nbytes, sr;
174 if (op->data.dir == SPI_MEM_DATA_IN) {
175 tx_fifo = stm32_qspi_read_fifo;
176 buf = op->data.buf.in;
179 tx_fifo = stm32_qspi_write_fifo;
180 buf = (u8 *)op->data.buf.out;
184 ret = readl_relaxed_poll_timeout_atomic(qspi->io_base + QSPI_SR,
185 sr, (sr & SR_FTF), 1,
186 STM32_FIFO_TIMEOUT_US);
188 dev_err(qspi->dev, "fifo timeout (len:%d stat:%#x)\n",
192 tx_fifo(buf++, qspi->io_base + QSPI_DR);
198 static int stm32_qspi_tx_mm(struct stm32_qspi *qspi,
199 const struct spi_mem_op *op)
201 memcpy_fromio(op->data.buf.in, qspi->mm_base + op->addr.val,
206 static void stm32_qspi_dma_callback(void *arg)
208 struct completion *dma_completion = arg;
210 complete(dma_completion);
213 static int stm32_qspi_tx_dma(struct stm32_qspi *qspi,
214 const struct spi_mem_op *op)
216 struct dma_async_tx_descriptor *desc;
217 enum dma_transfer_direction dma_dir;
218 struct dma_chan *dma_ch;
224 if (op->data.dir == SPI_MEM_DATA_IN) {
225 dma_dir = DMA_DEV_TO_MEM;
226 dma_ch = qspi->dma_chrx;
228 dma_dir = DMA_MEM_TO_DEV;
229 dma_ch = qspi->dma_chtx;
233 * spi_map_buf return -EINVAL if the buffer is not DMA-able
234 * (DMA-able: in vmalloc | kmap | virt_addr_valid)
236 err = spi_controller_dma_map_mem_op_data(qspi->ctrl, op, &sgt);
240 desc = dmaengine_prep_slave_sg(dma_ch, sgt.sgl, sgt.nents,
241 dma_dir, DMA_PREP_INTERRUPT);
247 cr = readl_relaxed(qspi->io_base + QSPI_CR);
249 reinit_completion(&qspi->dma_completion);
250 desc->callback = stm32_qspi_dma_callback;
251 desc->callback_param = &qspi->dma_completion;
252 cookie = dmaengine_submit(desc);
253 err = dma_submit_error(cookie);
257 dma_async_issue_pending(dma_ch);
259 writel_relaxed(cr | CR_DMAEN, qspi->io_base + QSPI_CR);
261 t_out = sgt.nents * STM32_COMP_TIMEOUT_MS;
262 if (!wait_for_completion_timeout(&qspi->dma_completion,
263 msecs_to_jiffies(t_out)))
267 dmaengine_terminate_all(dma_ch);
270 writel_relaxed(cr & ~CR_DMAEN, qspi->io_base + QSPI_CR);
272 spi_controller_dma_unmap_mem_op_data(qspi->ctrl, op, &sgt);
277 static int stm32_qspi_tx(struct stm32_qspi *qspi, const struct spi_mem_op *op)
279 if (!op->data.nbytes)
282 if (qspi->fmode == CCR_FMODE_MM)
283 return stm32_qspi_tx_mm(qspi, op);
284 else if (((op->data.dir == SPI_MEM_DATA_IN && qspi->dma_chrx) ||
285 (op->data.dir == SPI_MEM_DATA_OUT && qspi->dma_chtx)) &&
287 if (!stm32_qspi_tx_dma(qspi, op))
290 return stm32_qspi_tx_poll(qspi, op);
293 static int stm32_qspi_wait_nobusy(struct stm32_qspi *qspi)
297 return readl_relaxed_poll_timeout_atomic(qspi->io_base + QSPI_SR, sr,
299 STM32_BUSY_TIMEOUT_US);
302 static int stm32_qspi_wait_cmd(struct stm32_qspi *qspi)
307 if ((readl_relaxed(qspi->io_base + QSPI_SR) & SR_TCF) ||
308 qspi->fmode == CCR_FMODE_APM)
311 reinit_completion(&qspi->data_completion);
312 cr = readl_relaxed(qspi->io_base + QSPI_CR);
313 writel_relaxed(cr | CR_TCIE | CR_TEIE, qspi->io_base + QSPI_CR);
315 if (!wait_for_completion_timeout(&qspi->data_completion,
316 msecs_to_jiffies(STM32_COMP_TIMEOUT_MS))) {
319 sr = readl_relaxed(qspi->io_base + QSPI_SR);
326 writel_relaxed(FCR_CTCF | FCR_CTEF, qspi->io_base + QSPI_FCR);
328 err = stm32_qspi_wait_nobusy(qspi);
333 static int stm32_qspi_wait_poll_status(struct stm32_qspi *qspi)
337 reinit_completion(&qspi->match_completion);
338 cr = readl_relaxed(qspi->io_base + QSPI_CR);
339 writel_relaxed(cr | CR_SMIE, qspi->io_base + QSPI_CR);
341 if (!wait_for_completion_timeout(&qspi->match_completion,
342 msecs_to_jiffies(qspi->status_timeout)))
345 writel_relaxed(FCR_CSMF, qspi->io_base + QSPI_FCR);
350 static int stm32_qspi_get_mode(u8 buswidth)
353 return CCR_BUSWIDTH_4;
358 static int stm32_qspi_send(struct spi_mem *mem, const struct spi_mem_op *op)
360 struct stm32_qspi *qspi = spi_controller_get_devdata(mem->spi->master);
361 struct stm32_qspi_flash *flash = &qspi->flash[mem->spi->chip_select];
363 int timeout, err = 0, err_poll_status = 0;
365 dev_dbg(qspi->dev, "cmd:%#x mode:%d.%d.%d.%d addr:%#llx len:%#x\n",
366 op->cmd.opcode, op->cmd.buswidth, op->addr.buswidth,
367 op->dummy.buswidth, op->data.buswidth,
368 op->addr.val, op->data.nbytes);
370 cr = readl_relaxed(qspi->io_base + QSPI_CR);
371 cr &= ~CR_PRESC_MASK & ~CR_FSEL;
372 cr |= FIELD_PREP(CR_PRESC_MASK, flash->presc);
373 cr |= FIELD_PREP(CR_FSEL, flash->cs);
374 writel_relaxed(cr, qspi->io_base + QSPI_CR);
377 writel_relaxed(op->data.nbytes - 1,
378 qspi->io_base + QSPI_DLR);
381 ccr |= FIELD_PREP(CCR_INST_MASK, op->cmd.opcode);
382 ccr |= FIELD_PREP(CCR_IMODE_MASK,
383 stm32_qspi_get_mode(op->cmd.buswidth));
385 if (op->addr.nbytes) {
386 ccr |= FIELD_PREP(CCR_ADMODE_MASK,
387 stm32_qspi_get_mode(op->addr.buswidth));
388 ccr |= FIELD_PREP(CCR_ADSIZE_MASK, op->addr.nbytes - 1);
391 if (op->dummy.nbytes)
392 ccr |= FIELD_PREP(CCR_DCYC_MASK,
393 op->dummy.nbytes * 8 / op->dummy.buswidth);
395 if (op->data.nbytes) {
396 ccr |= FIELD_PREP(CCR_DMODE_MASK,
397 stm32_qspi_get_mode(op->data.buswidth));
400 writel_relaxed(ccr, qspi->io_base + QSPI_CCR);
402 if (op->addr.nbytes && qspi->fmode != CCR_FMODE_MM)
403 writel_relaxed(op->addr.val, qspi->io_base + QSPI_AR);
405 if (qspi->fmode == CCR_FMODE_APM)
406 err_poll_status = stm32_qspi_wait_poll_status(qspi);
408 err = stm32_qspi_tx(qspi, op);
413 * -read memory map: prefetching must be stopped if we read the last
414 * byte of device (device size - fifo size). like device size is not
415 * knows, the prefetching is always stop.
417 if (err || err_poll_status || qspi->fmode == CCR_FMODE_MM)
420 /* wait end of tx in indirect mode */
421 err = stm32_qspi_wait_cmd(qspi);
428 cr = readl_relaxed(qspi->io_base + QSPI_CR) | CR_ABORT;
429 writel_relaxed(cr, qspi->io_base + QSPI_CR);
431 /* wait clear of abort bit by hw */
432 timeout = readl_relaxed_poll_timeout_atomic(qspi->io_base + QSPI_CR,
433 cr, !(cr & CR_ABORT), 1,
434 STM32_ABT_TIMEOUT_US);
436 writel_relaxed(FCR_CTCF | FCR_CSMF, qspi->io_base + QSPI_FCR);
438 if (err || err_poll_status || timeout)
439 dev_err(qspi->dev, "%s err:%d err_poll_status:%d abort timeout:%d\n",
440 __func__, err, err_poll_status, timeout);
445 static int stm32_qspi_poll_status(struct spi_mem *mem, const struct spi_mem_op *op,
447 unsigned long initial_delay_us,
448 unsigned long polling_rate_us,
449 unsigned long timeout_ms)
451 struct stm32_qspi *qspi = spi_controller_get_devdata(mem->spi->master);
454 if (!spi_mem_supports_op(mem, op))
457 ret = pm_runtime_resume_and_get(qspi->dev);
461 mutex_lock(&qspi->lock);
463 writel_relaxed(mask, qspi->io_base + QSPI_PSMKR);
464 writel_relaxed(match, qspi->io_base + QSPI_PSMAR);
465 qspi->fmode = CCR_FMODE_APM;
466 qspi->status_timeout = timeout_ms;
468 ret = stm32_qspi_send(mem, op);
469 mutex_unlock(&qspi->lock);
471 pm_runtime_mark_last_busy(qspi->dev);
472 pm_runtime_put_autosuspend(qspi->dev);
477 static int stm32_qspi_exec_op(struct spi_mem *mem, const struct spi_mem_op *op)
479 struct stm32_qspi *qspi = spi_controller_get_devdata(mem->spi->master);
482 ret = pm_runtime_resume_and_get(qspi->dev);
486 mutex_lock(&qspi->lock);
487 if (op->data.dir == SPI_MEM_DATA_IN && op->data.nbytes)
488 qspi->fmode = CCR_FMODE_INDR;
490 qspi->fmode = CCR_FMODE_INDW;
492 ret = stm32_qspi_send(mem, op);
493 mutex_unlock(&qspi->lock);
495 pm_runtime_mark_last_busy(qspi->dev);
496 pm_runtime_put_autosuspend(qspi->dev);
501 static int stm32_qspi_dirmap_create(struct spi_mem_dirmap_desc *desc)
503 struct stm32_qspi *qspi = spi_controller_get_devdata(desc->mem->spi->master);
505 if (desc->info.op_tmpl.data.dir == SPI_MEM_DATA_OUT)
508 /* should never happen, as mm_base == null is an error probe exit condition */
509 if (!qspi->mm_base && desc->info.op_tmpl.data.dir == SPI_MEM_DATA_IN)
518 static ssize_t stm32_qspi_dirmap_read(struct spi_mem_dirmap_desc *desc,
519 u64 offs, size_t len, void *buf)
521 struct stm32_qspi *qspi = spi_controller_get_devdata(desc->mem->spi->master);
522 struct spi_mem_op op;
526 ret = pm_runtime_resume_and_get(qspi->dev);
530 mutex_lock(&qspi->lock);
531 /* make a local copy of desc op_tmpl and complete dirmap rdesc
532 * spi_mem_op template with offs, len and *buf in order to get
533 * all needed transfer information into struct spi_mem_op
535 memcpy(&op, &desc->info.op_tmpl, sizeof(struct spi_mem_op));
536 dev_dbg(qspi->dev, "%s len = 0x%zx offs = 0x%llx buf = 0x%p\n", __func__, len, offs, buf);
538 op.data.nbytes = len;
539 op.addr.val = desc->info.offset + offs;
540 op.data.buf.in = buf;
542 addr_max = op.addr.val + op.data.nbytes + 1;
543 if (addr_max < qspi->mm_size && op.addr.buswidth)
544 qspi->fmode = CCR_FMODE_MM;
546 qspi->fmode = CCR_FMODE_INDR;
548 ret = stm32_qspi_send(desc->mem, &op);
549 mutex_unlock(&qspi->lock);
551 pm_runtime_mark_last_busy(qspi->dev);
552 pm_runtime_put_autosuspend(qspi->dev);
557 static int stm32_qspi_setup(struct spi_device *spi)
559 struct spi_controller *ctrl = spi->master;
560 struct stm32_qspi *qspi = spi_controller_get_devdata(ctrl);
561 struct stm32_qspi_flash *flash;
568 if (!spi->max_speed_hz)
571 ret = pm_runtime_resume_and_get(qspi->dev);
575 presc = DIV_ROUND_UP(qspi->clk_rate, spi->max_speed_hz) - 1;
577 flash = &qspi->flash[spi->chip_select];
578 flash->cs = spi->chip_select;
579 flash->presc = presc;
581 mutex_lock(&qspi->lock);
582 qspi->cr_reg = CR_APMS | 3 << CR_FTHRES_SHIFT | CR_SSHIFT | CR_EN;
583 writel_relaxed(qspi->cr_reg, qspi->io_base + QSPI_CR);
585 /* set dcr fsize to max address */
586 qspi->dcr_reg = DCR_FSIZE_MASK;
587 writel_relaxed(qspi->dcr_reg, qspi->io_base + QSPI_DCR);
588 mutex_unlock(&qspi->lock);
590 pm_runtime_mark_last_busy(qspi->dev);
591 pm_runtime_put_autosuspend(qspi->dev);
596 static int stm32_qspi_dma_setup(struct stm32_qspi *qspi)
598 struct dma_slave_config dma_cfg;
599 struct device *dev = qspi->dev;
602 memset(&dma_cfg, 0, sizeof(dma_cfg));
604 dma_cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
605 dma_cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
606 dma_cfg.src_addr = qspi->phys_base + QSPI_DR;
607 dma_cfg.dst_addr = qspi->phys_base + QSPI_DR;
608 dma_cfg.src_maxburst = 4;
609 dma_cfg.dst_maxburst = 4;
611 qspi->dma_chrx = dma_request_chan(dev, "rx");
612 if (IS_ERR(qspi->dma_chrx)) {
613 ret = PTR_ERR(qspi->dma_chrx);
614 qspi->dma_chrx = NULL;
615 if (ret == -EPROBE_DEFER)
618 if (dmaengine_slave_config(qspi->dma_chrx, &dma_cfg)) {
619 dev_err(dev, "dma rx config failed\n");
620 dma_release_channel(qspi->dma_chrx);
621 qspi->dma_chrx = NULL;
625 qspi->dma_chtx = dma_request_chan(dev, "tx");
626 if (IS_ERR(qspi->dma_chtx)) {
627 ret = PTR_ERR(qspi->dma_chtx);
628 qspi->dma_chtx = NULL;
630 if (dmaengine_slave_config(qspi->dma_chtx, &dma_cfg)) {
631 dev_err(dev, "dma tx config failed\n");
632 dma_release_channel(qspi->dma_chtx);
633 qspi->dma_chtx = NULL;
638 init_completion(&qspi->dma_completion);
640 if (ret != -EPROBE_DEFER)
646 static void stm32_qspi_dma_free(struct stm32_qspi *qspi)
649 dma_release_channel(qspi->dma_chtx);
651 dma_release_channel(qspi->dma_chrx);
655 * no special host constraint, so use default spi_mem_default_supports_op
656 * to check supported mode.
658 static const struct spi_controller_mem_ops stm32_qspi_mem_ops = {
659 .exec_op = stm32_qspi_exec_op,
660 .dirmap_create = stm32_qspi_dirmap_create,
661 .dirmap_read = stm32_qspi_dirmap_read,
662 .poll_status = stm32_qspi_poll_status,
665 static int stm32_qspi_probe(struct platform_device *pdev)
667 struct device *dev = &pdev->dev;
668 struct spi_controller *ctrl;
669 struct reset_control *rstc;
670 struct stm32_qspi *qspi;
671 struct resource *res;
674 ctrl = devm_spi_alloc_master(dev, sizeof(*qspi));
678 qspi = spi_controller_get_devdata(ctrl);
681 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "qspi");
682 qspi->io_base = devm_ioremap_resource(dev, res);
683 if (IS_ERR(qspi->io_base))
684 return PTR_ERR(qspi->io_base);
686 qspi->phys_base = res->start;
688 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "qspi_mm");
689 qspi->mm_base = devm_ioremap_resource(dev, res);
690 if (IS_ERR(qspi->mm_base))
691 return PTR_ERR(qspi->mm_base);
693 qspi->mm_size = resource_size(res);
694 if (qspi->mm_size > STM32_QSPI_MAX_MMAP_SZ)
697 irq = platform_get_irq(pdev, 0);
701 ret = devm_request_irq(dev, irq, stm32_qspi_irq, 0,
702 dev_name(dev), qspi);
704 dev_err(dev, "failed to request irq\n");
708 init_completion(&qspi->data_completion);
709 init_completion(&qspi->match_completion);
711 qspi->clk = devm_clk_get(dev, NULL);
712 if (IS_ERR(qspi->clk))
713 return PTR_ERR(qspi->clk);
715 qspi->clk_rate = clk_get_rate(qspi->clk);
719 ret = clk_prepare_enable(qspi->clk);
721 dev_err(dev, "can not enable the clock\n");
725 rstc = devm_reset_control_get_exclusive(dev, NULL);
728 if (ret == -EPROBE_DEFER)
729 goto err_clk_disable;
731 reset_control_assert(rstc);
733 reset_control_deassert(rstc);
737 platform_set_drvdata(pdev, qspi);
738 ret = stm32_qspi_dma_setup(qspi);
742 mutex_init(&qspi->lock);
744 ctrl->mode_bits = SPI_RX_DUAL | SPI_RX_QUAD
745 | SPI_TX_DUAL | SPI_TX_QUAD;
746 ctrl->setup = stm32_qspi_setup;
748 ctrl->mem_ops = &stm32_qspi_mem_ops;
749 ctrl->num_chipselect = STM32_QSPI_MAX_NORCHIP;
750 ctrl->dev.of_node = dev->of_node;
752 pm_runtime_set_autosuspend_delay(dev, STM32_AUTOSUSPEND_DELAY);
753 pm_runtime_use_autosuspend(dev);
754 pm_runtime_set_active(dev);
755 pm_runtime_enable(dev);
756 pm_runtime_get_noresume(dev);
758 ret = spi_register_master(ctrl);
760 goto err_pm_runtime_free;
762 pm_runtime_mark_last_busy(dev);
763 pm_runtime_put_autosuspend(dev);
768 pm_runtime_get_sync(qspi->dev);
770 writel_relaxed(0, qspi->io_base + QSPI_CR);
771 mutex_destroy(&qspi->lock);
772 pm_runtime_put_noidle(qspi->dev);
773 pm_runtime_disable(qspi->dev);
774 pm_runtime_set_suspended(qspi->dev);
775 pm_runtime_dont_use_autosuspend(qspi->dev);
777 stm32_qspi_dma_free(qspi);
779 clk_disable_unprepare(qspi->clk);
784 static int stm32_qspi_remove(struct platform_device *pdev)
786 struct stm32_qspi *qspi = platform_get_drvdata(pdev);
788 pm_runtime_get_sync(qspi->dev);
789 spi_unregister_master(qspi->ctrl);
791 writel_relaxed(0, qspi->io_base + QSPI_CR);
792 stm32_qspi_dma_free(qspi);
793 mutex_destroy(&qspi->lock);
794 pm_runtime_put_noidle(qspi->dev);
795 pm_runtime_disable(qspi->dev);
796 pm_runtime_set_suspended(qspi->dev);
797 pm_runtime_dont_use_autosuspend(qspi->dev);
798 clk_disable_unprepare(qspi->clk);
803 static int __maybe_unused stm32_qspi_runtime_suspend(struct device *dev)
805 struct stm32_qspi *qspi = dev_get_drvdata(dev);
807 clk_disable_unprepare(qspi->clk);
812 static int __maybe_unused stm32_qspi_runtime_resume(struct device *dev)
814 struct stm32_qspi *qspi = dev_get_drvdata(dev);
816 return clk_prepare_enable(qspi->clk);
819 static int __maybe_unused stm32_qspi_suspend(struct device *dev)
821 pinctrl_pm_select_sleep_state(dev);
823 return pm_runtime_force_suspend(dev);
826 static int __maybe_unused stm32_qspi_resume(struct device *dev)
828 struct stm32_qspi *qspi = dev_get_drvdata(dev);
831 ret = pm_runtime_force_resume(dev);
835 pinctrl_pm_select_default_state(dev);
837 ret = pm_runtime_resume_and_get(dev);
841 writel_relaxed(qspi->cr_reg, qspi->io_base + QSPI_CR);
842 writel_relaxed(qspi->dcr_reg, qspi->io_base + QSPI_DCR);
844 pm_runtime_mark_last_busy(dev);
845 pm_runtime_put_autosuspend(dev);
850 static const struct dev_pm_ops stm32_qspi_pm_ops = {
851 SET_RUNTIME_PM_OPS(stm32_qspi_runtime_suspend,
852 stm32_qspi_runtime_resume, NULL)
853 SET_SYSTEM_SLEEP_PM_OPS(stm32_qspi_suspend, stm32_qspi_resume)
856 static const struct of_device_id stm32_qspi_match[] = {
857 {.compatible = "st,stm32f469-qspi"},
860 MODULE_DEVICE_TABLE(of, stm32_qspi_match);
862 static struct platform_driver stm32_qspi_driver = {
863 .probe = stm32_qspi_probe,
864 .remove = stm32_qspi_remove,
866 .name = "stm32-qspi",
867 .of_match_table = stm32_qspi_match,
868 .pm = &stm32_qspi_pm_ops,
871 module_platform_driver(stm32_qspi_driver);
873 MODULE_AUTHOR("Ludovic Barre <ludovic.barre@st.com>");
874 MODULE_DESCRIPTION("STMicroelectronics STM32 quad spi driver");
875 MODULE_LICENSE("GPL v2");