1 // SPDX-License-Identifier: GPL-2.0
5 * Copyright (C) 2012, 2013 Renesas Solutions Corp.
6 * Copyright (C) 2014 Glider bvba
9 * Copyright (C) 2011 Renesas Solutions Corp.
12 #include <linux/module.h>
13 #include <linux/kernel.h>
14 #include <linux/sched.h>
15 #include <linux/errno.h>
16 #include <linux/interrupt.h>
17 #include <linux/platform_device.h>
19 #include <linux/clk.h>
20 #include <linux/dmaengine.h>
21 #include <linux/dma-mapping.h>
22 #include <linux/of_device.h>
23 #include <linux/pm_runtime.h>
24 #include <linux/sh_dma.h>
25 #include <linux/spi/spi.h>
26 #include <linux/spi/rspi.h>
28 #define RSPI_SPCR 0x00 /* Control Register */
29 #define RSPI_SSLP 0x01 /* Slave Select Polarity Register */
30 #define RSPI_SPPCR 0x02 /* Pin Control Register */
31 #define RSPI_SPSR 0x03 /* Status Register */
32 #define RSPI_SPDR 0x04 /* Data Register */
33 #define RSPI_SPSCR 0x08 /* Sequence Control Register */
34 #define RSPI_SPSSR 0x09 /* Sequence Status Register */
35 #define RSPI_SPBR 0x0a /* Bit Rate Register */
36 #define RSPI_SPDCR 0x0b /* Data Control Register */
37 #define RSPI_SPCKD 0x0c /* Clock Delay Register */
38 #define RSPI_SSLND 0x0d /* Slave Select Negation Delay Register */
39 #define RSPI_SPND 0x0e /* Next-Access Delay Register */
40 #define RSPI_SPCR2 0x0f /* Control Register 2 (SH only) */
41 #define RSPI_SPCMD0 0x10 /* Command Register 0 */
42 #define RSPI_SPCMD1 0x12 /* Command Register 1 */
43 #define RSPI_SPCMD2 0x14 /* Command Register 2 */
44 #define RSPI_SPCMD3 0x16 /* Command Register 3 */
45 #define RSPI_SPCMD4 0x18 /* Command Register 4 */
46 #define RSPI_SPCMD5 0x1a /* Command Register 5 */
47 #define RSPI_SPCMD6 0x1c /* Command Register 6 */
48 #define RSPI_SPCMD7 0x1e /* Command Register 7 */
49 #define RSPI_SPCMD(i) (RSPI_SPCMD0 + (i) * 2)
50 #define RSPI_NUM_SPCMD 8
51 #define RSPI_RZ_NUM_SPCMD 4
52 #define QSPI_NUM_SPCMD 4
55 #define RSPI_SPBFCR 0x20 /* Buffer Control Register */
56 #define RSPI_SPBFDR 0x22 /* Buffer Data Count Setting Register */
59 #define QSPI_SPBFCR 0x18 /* Buffer Control Register */
60 #define QSPI_SPBDCR 0x1a /* Buffer Data Count Register */
61 #define QSPI_SPBMUL0 0x1c /* Transfer Data Length Multiplier Setting Register 0 */
62 #define QSPI_SPBMUL1 0x20 /* Transfer Data Length Multiplier Setting Register 1 */
63 #define QSPI_SPBMUL2 0x24 /* Transfer Data Length Multiplier Setting Register 2 */
64 #define QSPI_SPBMUL3 0x28 /* Transfer Data Length Multiplier Setting Register 3 */
65 #define QSPI_SPBMUL(i) (QSPI_SPBMUL0 + (i) * 4)
67 /* SPCR - Control Register */
68 #define SPCR_SPRIE 0x80 /* Receive Interrupt Enable */
69 #define SPCR_SPE 0x40 /* Function Enable */
70 #define SPCR_SPTIE 0x20 /* Transmit Interrupt Enable */
71 #define SPCR_SPEIE 0x10 /* Error Interrupt Enable */
72 #define SPCR_MSTR 0x08 /* Master/Slave Mode Select */
73 #define SPCR_MODFEN 0x04 /* Mode Fault Error Detection Enable */
75 #define SPCR_TXMD 0x02 /* TX Only Mode (vs. Full Duplex) */
76 #define SPCR_SPMS 0x01 /* 3-wire Mode (vs. 4-wire) */
77 /* QSPI on R-Car Gen2 only */
78 #define SPCR_WSWAP 0x02 /* Word Swap of read-data for DMAC */
79 #define SPCR_BSWAP 0x01 /* Byte Swap of read-data for DMAC */
81 /* SSLP - Slave Select Polarity Register */
82 #define SSLP_SSL1P 0x02 /* SSL1 Signal Polarity Setting */
83 #define SSLP_SSL0P 0x01 /* SSL0 Signal Polarity Setting */
85 /* SPPCR - Pin Control Register */
86 #define SPPCR_MOIFE 0x20 /* MOSI Idle Value Fixing Enable */
87 #define SPPCR_MOIFV 0x10 /* MOSI Idle Fixed Value */
88 #define SPPCR_SPOM 0x04
89 #define SPPCR_SPLP2 0x02 /* Loopback Mode 2 (non-inverting) */
90 #define SPPCR_SPLP 0x01 /* Loopback Mode (inverting) */
92 #define SPPCR_IO3FV 0x04 /* Single-/Dual-SPI Mode IO3 Output Fixed Value */
93 #define SPPCR_IO2FV 0x04 /* Single-/Dual-SPI Mode IO2 Output Fixed Value */
95 /* SPSR - Status Register */
96 #define SPSR_SPRF 0x80 /* Receive Buffer Full Flag */
97 #define SPSR_TEND 0x40 /* Transmit End */
98 #define SPSR_SPTEF 0x20 /* Transmit Buffer Empty Flag */
99 #define SPSR_PERF 0x08 /* Parity Error Flag */
100 #define SPSR_MODF 0x04 /* Mode Fault Error Flag */
101 #define SPSR_IDLNF 0x02 /* RSPI Idle Flag */
102 #define SPSR_OVRF 0x01 /* Overrun Error Flag (RSPI only) */
104 /* SPSCR - Sequence Control Register */
105 #define SPSCR_SPSLN_MASK 0x07 /* Sequence Length Specification */
107 /* SPSSR - Sequence Status Register */
108 #define SPSSR_SPECM_MASK 0x70 /* Command Error Mask */
109 #define SPSSR_SPCP_MASK 0x07 /* Command Pointer Mask */
111 /* SPDCR - Data Control Register */
112 #define SPDCR_TXDMY 0x80 /* Dummy Data Transmission Enable */
113 #define SPDCR_SPLW1 0x40 /* Access Width Specification (RZ) */
114 #define SPDCR_SPLW0 0x20 /* Access Width Specification (RZ) */
115 #define SPDCR_SPLLWORD (SPDCR_SPLW1 | SPDCR_SPLW0)
116 #define SPDCR_SPLWORD SPDCR_SPLW1
117 #define SPDCR_SPLBYTE SPDCR_SPLW0
118 #define SPDCR_SPLW 0x20 /* Access Width Specification (SH) */
119 #define SPDCR_SPRDTD 0x10 /* Receive Transmit Data Select (SH) */
120 #define SPDCR_SLSEL1 0x08
121 #define SPDCR_SLSEL0 0x04
122 #define SPDCR_SLSEL_MASK 0x0c /* SSL1 Output Select (SH) */
123 #define SPDCR_SPFC1 0x02
124 #define SPDCR_SPFC0 0x01
125 #define SPDCR_SPFC_MASK 0x03 /* Frame Count Setting (1-4) (SH) */
127 /* SPCKD - Clock Delay Register */
128 #define SPCKD_SCKDL_MASK 0x07 /* Clock Delay Setting (1-8) */
130 /* SSLND - Slave Select Negation Delay Register */
131 #define SSLND_SLNDL_MASK 0x07 /* SSL Negation Delay Setting (1-8) */
133 /* SPND - Next-Access Delay Register */
134 #define SPND_SPNDL_MASK 0x07 /* Next-Access Delay Setting (1-8) */
136 /* SPCR2 - Control Register 2 */
137 #define SPCR2_PTE 0x08 /* Parity Self-Test Enable */
138 #define SPCR2_SPIE 0x04 /* Idle Interrupt Enable */
139 #define SPCR2_SPOE 0x02 /* Odd Parity Enable (vs. Even) */
140 #define SPCR2_SPPE 0x01 /* Parity Enable */
142 /* SPCMDn - Command Registers */
143 #define SPCMD_SCKDEN 0x8000 /* Clock Delay Setting Enable */
144 #define SPCMD_SLNDEN 0x4000 /* SSL Negation Delay Setting Enable */
145 #define SPCMD_SPNDEN 0x2000 /* Next-Access Delay Enable */
146 #define SPCMD_LSBF 0x1000 /* LSB First */
147 #define SPCMD_SPB_MASK 0x0f00 /* Data Length Setting */
148 #define SPCMD_SPB_8_TO_16(bit) (((bit - 1) << 8) & SPCMD_SPB_MASK)
149 #define SPCMD_SPB_8BIT 0x0000 /* QSPI only */
150 #define SPCMD_SPB_16BIT 0x0100
151 #define SPCMD_SPB_20BIT 0x0000
152 #define SPCMD_SPB_24BIT 0x0100
153 #define SPCMD_SPB_32BIT 0x0200
154 #define SPCMD_SSLKP 0x0080 /* SSL Signal Level Keeping */
155 #define SPCMD_SPIMOD_MASK 0x0060 /* SPI Operating Mode (QSPI only) */
156 #define SPCMD_SPIMOD1 0x0040
157 #define SPCMD_SPIMOD0 0x0020
158 #define SPCMD_SPIMOD_SINGLE 0
159 #define SPCMD_SPIMOD_DUAL SPCMD_SPIMOD0
160 #define SPCMD_SPIMOD_QUAD SPCMD_SPIMOD1
161 #define SPCMD_SPRW 0x0010 /* SPI Read/Write Access (Dual/Quad) */
162 #define SPCMD_SSLA_MASK 0x0030 /* SSL Assert Signal Setting (RSPI) */
163 #define SPCMD_BRDV_MASK 0x000c /* Bit Rate Division Setting */
164 #define SPCMD_CPOL 0x0002 /* Clock Polarity Setting */
165 #define SPCMD_CPHA 0x0001 /* Clock Phase Setting */
167 /* SPBFCR - Buffer Control Register */
168 #define SPBFCR_TXRST 0x80 /* Transmit Buffer Data Reset */
169 #define SPBFCR_RXRST 0x40 /* Receive Buffer Data Reset */
170 #define SPBFCR_TXTRG_MASK 0x30 /* Transmit Buffer Data Triggering Number */
171 #define SPBFCR_RXTRG_MASK 0x07 /* Receive Buffer Data Triggering Number */
172 /* QSPI on R-Car Gen2 */
173 #define SPBFCR_TXTRG_1B 0x00 /* 31 bytes (1 byte available) */
174 #define SPBFCR_TXTRG_32B 0x30 /* 0 byte (32 bytes available) */
175 #define SPBFCR_RXTRG_1B 0x00 /* 1 byte (31 bytes available) */
176 #define SPBFCR_RXTRG_32B 0x07 /* 32 bytes (0 byte available) */
178 #define QSPI_BUFFER_SIZE 32u
183 struct spi_controller *ctlr;
184 wait_queue_head_t wait;
190 const struct spi_ops *ops;
192 unsigned dma_callbacked:1;
193 unsigned byte_access:1;
196 static void rspi_write8(const struct rspi_data *rspi, u8 data, u16 offset)
198 iowrite8(data, rspi->addr + offset);
201 static void rspi_write16(const struct rspi_data *rspi, u16 data, u16 offset)
203 iowrite16(data, rspi->addr + offset);
206 static void rspi_write32(const struct rspi_data *rspi, u32 data, u16 offset)
208 iowrite32(data, rspi->addr + offset);
211 static u8 rspi_read8(const struct rspi_data *rspi, u16 offset)
213 return ioread8(rspi->addr + offset);
216 static u16 rspi_read16(const struct rspi_data *rspi, u16 offset)
218 return ioread16(rspi->addr + offset);
221 static void rspi_write_data(const struct rspi_data *rspi, u16 data)
223 if (rspi->byte_access)
224 rspi_write8(rspi, data, RSPI_SPDR);
226 rspi_write16(rspi, data, RSPI_SPDR);
229 static u16 rspi_read_data(const struct rspi_data *rspi)
231 if (rspi->byte_access)
232 return rspi_read8(rspi, RSPI_SPDR);
234 return rspi_read16(rspi, RSPI_SPDR);
237 /* optional functions */
239 int (*set_config_register)(struct rspi_data *rspi, int access_size);
240 int (*transfer_one)(struct spi_controller *ctlr,
241 struct spi_device *spi, struct spi_transfer *xfer);
248 * functions for RSPI on legacy SH
250 static int rspi_set_config_register(struct rspi_data *rspi, int access_size)
254 /* Sets output mode, MOSI signal, and (optionally) loopback */
255 rspi_write8(rspi, rspi->sppcr, RSPI_SPPCR);
257 /* Sets transfer bit rate */
258 spbr = DIV_ROUND_UP(clk_get_rate(rspi->clk),
259 2 * rspi->max_speed_hz) - 1;
260 rspi_write8(rspi, clamp(spbr, 0, 255), RSPI_SPBR);
262 /* Disable dummy transmission, set 16-bit word access, 1 frame */
263 rspi_write8(rspi, 0, RSPI_SPDCR);
264 rspi->byte_access = 0;
266 /* Sets RSPCK, SSL, next-access delay value */
267 rspi_write8(rspi, 0x00, RSPI_SPCKD);
268 rspi_write8(rspi, 0x00, RSPI_SSLND);
269 rspi_write8(rspi, 0x00, RSPI_SPND);
271 /* Sets parity, interrupt mask */
272 rspi_write8(rspi, 0x00, RSPI_SPCR2);
274 /* Resets sequencer */
275 rspi_write8(rspi, 0, RSPI_SPSCR);
276 rspi->spcmd |= SPCMD_SPB_8_TO_16(access_size);
277 rspi_write16(rspi, rspi->spcmd, RSPI_SPCMD0);
280 rspi_write8(rspi, SPCR_MSTR, RSPI_SPCR);
286 * functions for RSPI on RZ
288 static int rspi_rz_set_config_register(struct rspi_data *rspi, int access_size)
292 unsigned long clksrc;
294 /* Sets output mode, MOSI signal, and (optionally) loopback */
295 rspi_write8(rspi, rspi->sppcr, RSPI_SPPCR);
297 clksrc = clk_get_rate(rspi->clk);
299 if (rspi->max_speed_hz >= clksrc/4) /* 4=(CLK/2)/2 */
305 /* Sets transfer bit rate */
306 spbr = DIV_ROUND_UP(clksrc, 2 * rspi->max_speed_hz) - 1;
307 rspi_write8(rspi, clamp(spbr, 0, 255), RSPI_SPBR);
308 rspi->spcmd |= div << 2;
310 /* Disable dummy transmission, set byte access */
311 rspi_write8(rspi, SPDCR_SPLBYTE, RSPI_SPDCR);
312 rspi->byte_access = 1;
314 /* Sets RSPCK, SSL, next-access delay value */
315 rspi_write8(rspi, 0x00, RSPI_SPCKD);
316 rspi_write8(rspi, 0x00, RSPI_SSLND);
317 rspi_write8(rspi, 0x00, RSPI_SPND);
319 /* Resets sequencer */
320 rspi_write8(rspi, 0, RSPI_SPSCR);
321 rspi->spcmd |= SPCMD_SPB_8_TO_16(access_size);
322 rspi_write16(rspi, rspi->spcmd, RSPI_SPCMD0);
325 rspi_write8(rspi, SPCR_MSTR, RSPI_SPCR);
333 static int qspi_set_config_register(struct rspi_data *rspi, int access_size)
337 /* Sets output mode, MOSI signal, and (optionally) loopback */
338 rspi_write8(rspi, rspi->sppcr, RSPI_SPPCR);
340 /* Sets transfer bit rate */
341 spbr = DIV_ROUND_UP(clk_get_rate(rspi->clk), 2 * rspi->max_speed_hz);
342 rspi_write8(rspi, clamp(spbr, 0, 255), RSPI_SPBR);
344 /* Disable dummy transmission, set byte access */
345 rspi_write8(rspi, 0, RSPI_SPDCR);
346 rspi->byte_access = 1;
348 /* Sets RSPCK, SSL, next-access delay value */
349 rspi_write8(rspi, 0x00, RSPI_SPCKD);
350 rspi_write8(rspi, 0x00, RSPI_SSLND);
351 rspi_write8(rspi, 0x00, RSPI_SPND);
353 /* Data Length Setting */
354 if (access_size == 8)
355 rspi->spcmd |= SPCMD_SPB_8BIT;
356 else if (access_size == 16)
357 rspi->spcmd |= SPCMD_SPB_16BIT;
359 rspi->spcmd |= SPCMD_SPB_32BIT;
361 rspi->spcmd |= SPCMD_SCKDEN | SPCMD_SLNDEN | SPCMD_SPNDEN;
363 /* Resets transfer data length */
364 rspi_write32(rspi, 0, QSPI_SPBMUL0);
366 /* Resets transmit and receive buffer */
367 rspi_write8(rspi, SPBFCR_TXRST | SPBFCR_RXRST, QSPI_SPBFCR);
368 /* Sets buffer to allow normal operation */
369 rspi_write8(rspi, 0x00, QSPI_SPBFCR);
371 /* Resets sequencer */
372 rspi_write8(rspi, 0, RSPI_SPSCR);
373 rspi_write16(rspi, rspi->spcmd, RSPI_SPCMD0);
376 rspi_write8(rspi, SPCR_MSTR, RSPI_SPCR);
381 static void qspi_update(const struct rspi_data *rspi, u8 mask, u8 val, u8 reg)
385 data = rspi_read8(rspi, reg);
387 data |= (val & mask);
388 rspi_write8(rspi, data, reg);
391 static unsigned int qspi_set_send_trigger(struct rspi_data *rspi,
396 n = min(len, QSPI_BUFFER_SIZE);
398 if (len >= QSPI_BUFFER_SIZE) {
399 /* sets triggering number to 32 bytes */
400 qspi_update(rspi, SPBFCR_TXTRG_MASK,
401 SPBFCR_TXTRG_32B, QSPI_SPBFCR);
403 /* sets triggering number to 1 byte */
404 qspi_update(rspi, SPBFCR_TXTRG_MASK,
405 SPBFCR_TXTRG_1B, QSPI_SPBFCR);
411 static int qspi_set_receive_trigger(struct rspi_data *rspi, unsigned int len)
415 n = min(len, QSPI_BUFFER_SIZE);
417 if (len >= QSPI_BUFFER_SIZE) {
418 /* sets triggering number to 32 bytes */
419 qspi_update(rspi, SPBFCR_RXTRG_MASK,
420 SPBFCR_RXTRG_32B, QSPI_SPBFCR);
422 /* sets triggering number to 1 byte */
423 qspi_update(rspi, SPBFCR_RXTRG_MASK,
424 SPBFCR_RXTRG_1B, QSPI_SPBFCR);
429 #define set_config_register(spi, n) spi->ops->set_config_register(spi, n)
431 static void rspi_enable_irq(const struct rspi_data *rspi, u8 enable)
433 rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) | enable, RSPI_SPCR);
436 static void rspi_disable_irq(const struct rspi_data *rspi, u8 disable)
438 rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) & ~disable, RSPI_SPCR);
441 static int rspi_wait_for_interrupt(struct rspi_data *rspi, u8 wait_mask,
446 rspi->spsr = rspi_read8(rspi, RSPI_SPSR);
447 if (rspi->spsr & wait_mask)
450 rspi_enable_irq(rspi, enable_bit);
451 ret = wait_event_timeout(rspi->wait, rspi->spsr & wait_mask, HZ);
452 if (ret == 0 && !(rspi->spsr & wait_mask))
458 static inline int rspi_wait_for_tx_empty(struct rspi_data *rspi)
460 return rspi_wait_for_interrupt(rspi, SPSR_SPTEF, SPCR_SPTIE);
463 static inline int rspi_wait_for_rx_full(struct rspi_data *rspi)
465 return rspi_wait_for_interrupt(rspi, SPSR_SPRF, SPCR_SPRIE);
468 static int rspi_data_out(struct rspi_data *rspi, u8 data)
470 int error = rspi_wait_for_tx_empty(rspi);
472 dev_err(&rspi->ctlr->dev, "transmit timeout\n");
475 rspi_write_data(rspi, data);
479 static int rspi_data_in(struct rspi_data *rspi)
484 error = rspi_wait_for_rx_full(rspi);
486 dev_err(&rspi->ctlr->dev, "receive timeout\n");
489 data = rspi_read_data(rspi);
493 static int rspi_pio_transfer(struct rspi_data *rspi, const u8 *tx, u8 *rx,
498 int ret = rspi_data_out(rspi, *tx++);
503 int ret = rspi_data_in(rspi);
513 static void rspi_dma_complete(void *arg)
515 struct rspi_data *rspi = arg;
517 rspi->dma_callbacked = 1;
518 wake_up_interruptible(&rspi->wait);
521 static int rspi_dma_transfer(struct rspi_data *rspi, struct sg_table *tx,
524 struct dma_async_tx_descriptor *desc_tx = NULL, *desc_rx = NULL;
526 unsigned int other_irq = 0;
530 /* First prepare and submit the DMA request(s), as this may fail */
532 desc_rx = dmaengine_prep_slave_sg(rspi->ctlr->dma_rx, rx->sgl,
533 rx->nents, DMA_DEV_TO_MEM,
534 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
540 desc_rx->callback = rspi_dma_complete;
541 desc_rx->callback_param = rspi;
542 cookie = dmaengine_submit(desc_rx);
543 if (dma_submit_error(cookie)) {
548 irq_mask |= SPCR_SPRIE;
552 desc_tx = dmaengine_prep_slave_sg(rspi->ctlr->dma_tx, tx->sgl,
553 tx->nents, DMA_MEM_TO_DEV,
554 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
562 desc_tx->callback = NULL;
564 desc_tx->callback = rspi_dma_complete;
565 desc_tx->callback_param = rspi;
567 cookie = dmaengine_submit(desc_tx);
568 if (dma_submit_error(cookie)) {
573 irq_mask |= SPCR_SPTIE;
577 * DMAC needs SPxIE, but if SPxIE is set, the IRQ routine will be
578 * called. So, this driver disables the IRQ while DMA transfer.
581 disable_irq(other_irq = rspi->tx_irq);
582 if (rx && rspi->rx_irq != other_irq)
583 disable_irq(rspi->rx_irq);
585 rspi_enable_irq(rspi, irq_mask);
586 rspi->dma_callbacked = 0;
590 dma_async_issue_pending(rspi->ctlr->dma_rx);
592 dma_async_issue_pending(rspi->ctlr->dma_tx);
594 ret = wait_event_interruptible_timeout(rspi->wait,
595 rspi->dma_callbacked, HZ);
596 if (ret > 0 && rspi->dma_callbacked) {
600 dev_err(&rspi->ctlr->dev, "DMA timeout\n");
604 dmaengine_terminate_all(rspi->ctlr->dma_tx);
606 dmaengine_terminate_all(rspi->ctlr->dma_rx);
609 rspi_disable_irq(rspi, irq_mask);
612 enable_irq(rspi->tx_irq);
613 if (rx && rspi->rx_irq != other_irq)
614 enable_irq(rspi->rx_irq);
620 dmaengine_terminate_all(rspi->ctlr->dma_rx);
622 if (ret == -EAGAIN) {
623 pr_warn_once("%s %s: DMA not available, falling back to PIO\n",
624 dev_driver_string(&rspi->ctlr->dev),
625 dev_name(&rspi->ctlr->dev));
630 static void rspi_receive_init(const struct rspi_data *rspi)
634 spsr = rspi_read8(rspi, RSPI_SPSR);
635 if (spsr & SPSR_SPRF)
636 rspi_read_data(rspi); /* dummy read */
637 if (spsr & SPSR_OVRF)
638 rspi_write8(rspi, rspi_read8(rspi, RSPI_SPSR) & ~SPSR_OVRF,
642 static void rspi_rz_receive_init(const struct rspi_data *rspi)
644 rspi_receive_init(rspi);
645 rspi_write8(rspi, SPBFCR_TXRST | SPBFCR_RXRST, RSPI_SPBFCR);
646 rspi_write8(rspi, 0, RSPI_SPBFCR);
649 static void qspi_receive_init(const struct rspi_data *rspi)
653 spsr = rspi_read8(rspi, RSPI_SPSR);
654 if (spsr & SPSR_SPRF)
655 rspi_read_data(rspi); /* dummy read */
656 rspi_write8(rspi, SPBFCR_TXRST | SPBFCR_RXRST, QSPI_SPBFCR);
657 rspi_write8(rspi, 0, QSPI_SPBFCR);
660 static bool __rspi_can_dma(const struct rspi_data *rspi,
661 const struct spi_transfer *xfer)
663 return xfer->len > rspi->ops->fifo_size;
666 static bool rspi_can_dma(struct spi_controller *ctlr, struct spi_device *spi,
667 struct spi_transfer *xfer)
669 struct rspi_data *rspi = spi_controller_get_devdata(ctlr);
671 return __rspi_can_dma(rspi, xfer);
674 static int rspi_dma_check_then_transfer(struct rspi_data *rspi,
675 struct spi_transfer *xfer)
677 if (!rspi->ctlr->can_dma || !__rspi_can_dma(rspi, xfer))
680 /* rx_buf can be NULL on RSPI on SH in TX-only Mode */
681 return rspi_dma_transfer(rspi, &xfer->tx_sg,
682 xfer->rx_buf ? &xfer->rx_sg : NULL);
685 static int rspi_common_transfer(struct rspi_data *rspi,
686 struct spi_transfer *xfer)
690 ret = rspi_dma_check_then_transfer(rspi, xfer);
694 ret = rspi_pio_transfer(rspi, xfer->tx_buf, xfer->rx_buf, xfer->len);
698 /* Wait for the last transmission */
699 rspi_wait_for_tx_empty(rspi);
704 static int rspi_transfer_one(struct spi_controller *ctlr,
705 struct spi_device *spi, struct spi_transfer *xfer)
707 struct rspi_data *rspi = spi_controller_get_devdata(ctlr);
710 spcr = rspi_read8(rspi, RSPI_SPCR);
712 rspi_receive_init(rspi);
717 rspi_write8(rspi, spcr, RSPI_SPCR);
719 return rspi_common_transfer(rspi, xfer);
722 static int rspi_rz_transfer_one(struct spi_controller *ctlr,
723 struct spi_device *spi,
724 struct spi_transfer *xfer)
726 struct rspi_data *rspi = spi_controller_get_devdata(ctlr);
728 rspi_rz_receive_init(rspi);
730 return rspi_common_transfer(rspi, xfer);
733 static int qspi_trigger_transfer_out_in(struct rspi_data *rspi, const u8 *tx,
734 u8 *rx, unsigned int len)
740 n = qspi_set_send_trigger(rspi, len);
741 qspi_set_receive_trigger(rspi, len);
742 if (n == QSPI_BUFFER_SIZE) {
743 ret = rspi_wait_for_tx_empty(rspi);
745 dev_err(&rspi->ctlr->dev, "transmit timeout\n");
748 for (i = 0; i < n; i++)
749 rspi_write_data(rspi, *tx++);
751 ret = rspi_wait_for_rx_full(rspi);
753 dev_err(&rspi->ctlr->dev, "receive timeout\n");
756 for (i = 0; i < n; i++)
757 *rx++ = rspi_read_data(rspi);
759 ret = rspi_pio_transfer(rspi, tx, rx, n);
769 static int qspi_transfer_out_in(struct rspi_data *rspi,
770 struct spi_transfer *xfer)
774 qspi_receive_init(rspi);
776 ret = rspi_dma_check_then_transfer(rspi, xfer);
780 return qspi_trigger_transfer_out_in(rspi, xfer->tx_buf,
781 xfer->rx_buf, xfer->len);
784 static int qspi_transfer_out(struct rspi_data *rspi, struct spi_transfer *xfer)
786 const u8 *tx = xfer->tx_buf;
787 unsigned int n = xfer->len;
791 if (rspi->ctlr->can_dma && __rspi_can_dma(rspi, xfer)) {
792 ret = rspi_dma_transfer(rspi, &xfer->tx_sg, NULL);
798 len = qspi_set_send_trigger(rspi, n);
799 if (len == QSPI_BUFFER_SIZE) {
800 ret = rspi_wait_for_tx_empty(rspi);
802 dev_err(&rspi->ctlr->dev, "transmit timeout\n");
805 for (i = 0; i < len; i++)
806 rspi_write_data(rspi, *tx++);
808 ret = rspi_pio_transfer(rspi, tx, NULL, len);
815 /* Wait for the last transmission */
816 rspi_wait_for_tx_empty(rspi);
821 static int qspi_transfer_in(struct rspi_data *rspi, struct spi_transfer *xfer)
823 u8 *rx = xfer->rx_buf;
824 unsigned int n = xfer->len;
828 if (rspi->ctlr->can_dma && __rspi_can_dma(rspi, xfer)) {
829 int ret = rspi_dma_transfer(rspi, NULL, &xfer->rx_sg);
835 len = qspi_set_receive_trigger(rspi, n);
836 if (len == QSPI_BUFFER_SIZE) {
837 ret = rspi_wait_for_rx_full(rspi);
839 dev_err(&rspi->ctlr->dev, "receive timeout\n");
842 for (i = 0; i < len; i++)
843 *rx++ = rspi_read_data(rspi);
845 ret = rspi_pio_transfer(rspi, NULL, rx, len);
855 static int qspi_transfer_one(struct spi_controller *ctlr,
856 struct spi_device *spi, struct spi_transfer *xfer)
858 struct rspi_data *rspi = spi_controller_get_devdata(ctlr);
860 if (spi->mode & SPI_LOOP) {
861 return qspi_transfer_out_in(rspi, xfer);
862 } else if (xfer->tx_nbits > SPI_NBITS_SINGLE) {
863 /* Quad or Dual SPI Write */
864 return qspi_transfer_out(rspi, xfer);
865 } else if (xfer->rx_nbits > SPI_NBITS_SINGLE) {
866 /* Quad or Dual SPI Read */
867 return qspi_transfer_in(rspi, xfer);
869 /* Single SPI Transfer */
870 return qspi_transfer_out_in(rspi, xfer);
874 static u16 qspi_transfer_mode(const struct spi_transfer *xfer)
877 switch (xfer->tx_nbits) {
879 return SPCMD_SPIMOD_QUAD;
881 return SPCMD_SPIMOD_DUAL;
886 switch (xfer->rx_nbits) {
888 return SPCMD_SPIMOD_QUAD | SPCMD_SPRW;
890 return SPCMD_SPIMOD_DUAL | SPCMD_SPRW;
898 static int qspi_setup_sequencer(struct rspi_data *rspi,
899 const struct spi_message *msg)
901 const struct spi_transfer *xfer;
902 unsigned int i = 0, len = 0;
903 u16 current_mode = 0xffff, mode;
905 list_for_each_entry(xfer, &msg->transfers, transfer_list) {
906 mode = qspi_transfer_mode(xfer);
907 if (mode == current_mode) {
912 /* Transfer mode change */
914 /* Set transfer data length of previous transfer */
915 rspi_write32(rspi, len, QSPI_SPBMUL(i - 1));
918 if (i >= QSPI_NUM_SPCMD) {
919 dev_err(&msg->spi->dev,
920 "Too many different transfer modes");
924 /* Program transfer mode for this transfer */
925 rspi_write16(rspi, rspi->spcmd | mode, RSPI_SPCMD(i));
931 /* Set final transfer data length and sequence length */
932 rspi_write32(rspi, len, QSPI_SPBMUL(i - 1));
933 rspi_write8(rspi, i - 1, RSPI_SPSCR);
939 static int rspi_prepare_message(struct spi_controller *ctlr,
940 struct spi_message *msg)
942 struct rspi_data *rspi = spi_controller_get_devdata(ctlr);
943 struct spi_device *spi = msg->spi;
946 rspi->max_speed_hz = spi->max_speed_hz;
948 rspi->spcmd = SPCMD_SSLKP;
949 if (spi->mode & SPI_CPOL)
950 rspi->spcmd |= SPCMD_CPOL;
951 if (spi->mode & SPI_CPHA)
952 rspi->spcmd |= SPCMD_CPHA;
954 /* CMOS output mode and MOSI signal from previous transfer */
956 if (spi->mode & SPI_LOOP)
957 rspi->sppcr |= SPPCR_SPLP;
959 set_config_register(rspi, 8);
962 (SPI_TX_DUAL | SPI_TX_QUAD | SPI_RX_DUAL | SPI_RX_QUAD)) {
963 /* Setup sequencer for messages with multiple transfer modes */
964 ret = qspi_setup_sequencer(rspi, msg);
969 /* Enable SPI function in master mode */
970 rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) | SPCR_SPE, RSPI_SPCR);
974 static int rspi_unprepare_message(struct spi_controller *ctlr,
975 struct spi_message *msg)
977 struct rspi_data *rspi = spi_controller_get_devdata(ctlr);
979 /* Disable SPI function */
980 rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) & ~SPCR_SPE, RSPI_SPCR);
982 /* Reset sequencer for Single SPI Transfers */
983 rspi_write16(rspi, rspi->spcmd, RSPI_SPCMD0);
984 rspi_write8(rspi, 0, RSPI_SPSCR);
988 static irqreturn_t rspi_irq_mux(int irq, void *_sr)
990 struct rspi_data *rspi = _sr;
992 irqreturn_t ret = IRQ_NONE;
995 rspi->spsr = spsr = rspi_read8(rspi, RSPI_SPSR);
996 if (spsr & SPSR_SPRF)
997 disable_irq |= SPCR_SPRIE;
998 if (spsr & SPSR_SPTEF)
999 disable_irq |= SPCR_SPTIE;
1003 rspi_disable_irq(rspi, disable_irq);
1004 wake_up(&rspi->wait);
1010 static irqreturn_t rspi_irq_rx(int irq, void *_sr)
1012 struct rspi_data *rspi = _sr;
1015 rspi->spsr = spsr = rspi_read8(rspi, RSPI_SPSR);
1016 if (spsr & SPSR_SPRF) {
1017 rspi_disable_irq(rspi, SPCR_SPRIE);
1018 wake_up(&rspi->wait);
1025 static irqreturn_t rspi_irq_tx(int irq, void *_sr)
1027 struct rspi_data *rspi = _sr;
1030 rspi->spsr = spsr = rspi_read8(rspi, RSPI_SPSR);
1031 if (spsr & SPSR_SPTEF) {
1032 rspi_disable_irq(rspi, SPCR_SPTIE);
1033 wake_up(&rspi->wait);
1040 static struct dma_chan *rspi_request_dma_chan(struct device *dev,
1041 enum dma_transfer_direction dir,
1043 dma_addr_t port_addr)
1045 dma_cap_mask_t mask;
1046 struct dma_chan *chan;
1047 struct dma_slave_config cfg;
1051 dma_cap_set(DMA_SLAVE, mask);
1053 chan = dma_request_slave_channel_compat(mask, shdma_chan_filter,
1054 (void *)(unsigned long)id, dev,
1055 dir == DMA_MEM_TO_DEV ? "tx" : "rx");
1057 dev_warn(dev, "dma_request_slave_channel_compat failed\n");
1061 memset(&cfg, 0, sizeof(cfg));
1062 cfg.direction = dir;
1063 if (dir == DMA_MEM_TO_DEV) {
1064 cfg.dst_addr = port_addr;
1065 cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
1067 cfg.src_addr = port_addr;
1068 cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
1071 ret = dmaengine_slave_config(chan, &cfg);
1073 dev_warn(dev, "dmaengine_slave_config failed %d\n", ret);
1074 dma_release_channel(chan);
1081 static int rspi_request_dma(struct device *dev, struct spi_controller *ctlr,
1082 const struct resource *res)
1084 const struct rspi_plat_data *rspi_pd = dev_get_platdata(dev);
1085 unsigned int dma_tx_id, dma_rx_id;
1088 /* In the OF case we will get the slave IDs from the DT */
1091 } else if (rspi_pd && rspi_pd->dma_tx_id && rspi_pd->dma_rx_id) {
1092 dma_tx_id = rspi_pd->dma_tx_id;
1093 dma_rx_id = rspi_pd->dma_rx_id;
1095 /* The driver assumes no error. */
1099 ctlr->dma_tx = rspi_request_dma_chan(dev, DMA_MEM_TO_DEV, dma_tx_id,
1100 res->start + RSPI_SPDR);
1104 ctlr->dma_rx = rspi_request_dma_chan(dev, DMA_DEV_TO_MEM, dma_rx_id,
1105 res->start + RSPI_SPDR);
1106 if (!ctlr->dma_rx) {
1107 dma_release_channel(ctlr->dma_tx);
1108 ctlr->dma_tx = NULL;
1112 ctlr->can_dma = rspi_can_dma;
1113 dev_info(dev, "DMA available");
1117 static void rspi_release_dma(struct spi_controller *ctlr)
1120 dma_release_channel(ctlr->dma_tx);
1122 dma_release_channel(ctlr->dma_rx);
1125 static int rspi_remove(struct platform_device *pdev)
1127 struct rspi_data *rspi = platform_get_drvdata(pdev);
1129 rspi_release_dma(rspi->ctlr);
1130 pm_runtime_disable(&pdev->dev);
1135 static const struct spi_ops rspi_ops = {
1136 .set_config_register = rspi_set_config_register,
1137 .transfer_one = rspi_transfer_one,
1138 .mode_bits = SPI_CPHA | SPI_CPOL | SPI_LOOP,
1139 .flags = SPI_CONTROLLER_MUST_TX,
1143 static const struct spi_ops rspi_rz_ops = {
1144 .set_config_register = rspi_rz_set_config_register,
1145 .transfer_one = rspi_rz_transfer_one,
1146 .mode_bits = SPI_CPHA | SPI_CPOL | SPI_LOOP,
1147 .flags = SPI_CONTROLLER_MUST_RX | SPI_CONTROLLER_MUST_TX,
1148 .fifo_size = 8, /* 8 for TX, 32 for RX */
1151 static const struct spi_ops qspi_ops = {
1152 .set_config_register = qspi_set_config_register,
1153 .transfer_one = qspi_transfer_one,
1154 .mode_bits = SPI_CPHA | SPI_CPOL | SPI_LOOP |
1155 SPI_TX_DUAL | SPI_TX_QUAD |
1156 SPI_RX_DUAL | SPI_RX_QUAD,
1157 .flags = SPI_CONTROLLER_MUST_RX | SPI_CONTROLLER_MUST_TX,
1162 static const struct of_device_id rspi_of_match[] = {
1163 /* RSPI on legacy SH */
1164 { .compatible = "renesas,rspi", .data = &rspi_ops },
1165 /* RSPI on RZ/A1H */
1166 { .compatible = "renesas,rspi-rz", .data = &rspi_rz_ops },
1167 /* QSPI on R-Car Gen2 */
1168 { .compatible = "renesas,qspi", .data = &qspi_ops },
1172 MODULE_DEVICE_TABLE(of, rspi_of_match);
1174 static int rspi_parse_dt(struct device *dev, struct spi_controller *ctlr)
1179 /* Parse DT properties */
1180 error = of_property_read_u32(dev->of_node, "num-cs", &num_cs);
1182 dev_err(dev, "of_property_read_u32 num-cs failed %d\n", error);
1186 ctlr->num_chipselect = num_cs;
1190 #define rspi_of_match NULL
1191 static inline int rspi_parse_dt(struct device *dev, struct spi_controller *ctlr)
1195 #endif /* CONFIG_OF */
1197 static int rspi_request_irq(struct device *dev, unsigned int irq,
1198 irq_handler_t handler, const char *suffix,
1201 const char *name = devm_kasprintf(dev, GFP_KERNEL, "%s:%s",
1202 dev_name(dev), suffix);
1206 return devm_request_irq(dev, irq, handler, 0, name, dev_id);
1209 static int rspi_probe(struct platform_device *pdev)
1211 struct resource *res;
1212 struct spi_controller *ctlr;
1213 struct rspi_data *rspi;
1215 const struct rspi_plat_data *rspi_pd;
1216 const struct spi_ops *ops;
1218 ctlr = spi_alloc_master(&pdev->dev, sizeof(struct rspi_data));
1222 ops = of_device_get_match_data(&pdev->dev);
1224 ret = rspi_parse_dt(&pdev->dev, ctlr);
1228 ops = (struct spi_ops *)pdev->id_entry->driver_data;
1229 rspi_pd = dev_get_platdata(&pdev->dev);
1230 if (rspi_pd && rspi_pd->num_chipselect)
1231 ctlr->num_chipselect = rspi_pd->num_chipselect;
1233 ctlr->num_chipselect = 2; /* default */
1236 /* ops parameter check */
1237 if (!ops->set_config_register) {
1238 dev_err(&pdev->dev, "there is no set_config_register\n");
1243 rspi = spi_controller_get_devdata(ctlr);
1244 platform_set_drvdata(pdev, rspi);
1248 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1249 rspi->addr = devm_ioremap_resource(&pdev->dev, res);
1250 if (IS_ERR(rspi->addr)) {
1251 ret = PTR_ERR(rspi->addr);
1255 rspi->clk = devm_clk_get(&pdev->dev, NULL);
1256 if (IS_ERR(rspi->clk)) {
1257 dev_err(&pdev->dev, "cannot get clock\n");
1258 ret = PTR_ERR(rspi->clk);
1262 pm_runtime_enable(&pdev->dev);
1264 init_waitqueue_head(&rspi->wait);
1266 ctlr->bus_num = pdev->id;
1267 ctlr->auto_runtime_pm = true;
1268 ctlr->transfer_one = ops->transfer_one;
1269 ctlr->prepare_message = rspi_prepare_message;
1270 ctlr->unprepare_message = rspi_unprepare_message;
1271 ctlr->mode_bits = ops->mode_bits;
1272 ctlr->flags = ops->flags;
1273 ctlr->dev.of_node = pdev->dev.of_node;
1275 ret = platform_get_irq_byname(pdev, "rx");
1277 ret = platform_get_irq_byname(pdev, "mux");
1279 ret = platform_get_irq(pdev, 0);
1281 rspi->rx_irq = rspi->tx_irq = ret;
1284 ret = platform_get_irq_byname(pdev, "tx");
1289 dev_err(&pdev->dev, "platform_get_irq error\n");
1293 if (rspi->rx_irq == rspi->tx_irq) {
1294 /* Single multiplexed interrupt */
1295 ret = rspi_request_irq(&pdev->dev, rspi->rx_irq, rspi_irq_mux,
1298 /* Multi-interrupt mode, only SPRI and SPTI are used */
1299 ret = rspi_request_irq(&pdev->dev, rspi->rx_irq, rspi_irq_rx,
1302 ret = rspi_request_irq(&pdev->dev, rspi->tx_irq,
1303 rspi_irq_tx, "tx", rspi);
1306 dev_err(&pdev->dev, "request_irq error\n");
1310 ret = rspi_request_dma(&pdev->dev, ctlr, res);
1312 dev_warn(&pdev->dev, "DMA not available, using PIO\n");
1314 ret = devm_spi_register_controller(&pdev->dev, ctlr);
1316 dev_err(&pdev->dev, "devm_spi_register_controller error.\n");
1320 dev_info(&pdev->dev, "probed\n");
1325 rspi_release_dma(ctlr);
1327 pm_runtime_disable(&pdev->dev);
1329 spi_controller_put(ctlr);
1334 static const struct platform_device_id spi_driver_ids[] = {
1335 { "rspi", (kernel_ulong_t)&rspi_ops },
1336 { "rspi-rz", (kernel_ulong_t)&rspi_rz_ops },
1337 { "qspi", (kernel_ulong_t)&qspi_ops },
1341 MODULE_DEVICE_TABLE(platform, spi_driver_ids);
1343 #ifdef CONFIG_PM_SLEEP
1344 static int rspi_suspend(struct device *dev)
1346 struct rspi_data *rspi = dev_get_drvdata(dev);
1348 return spi_controller_suspend(rspi->ctlr);
1351 static int rspi_resume(struct device *dev)
1353 struct rspi_data *rspi = dev_get_drvdata(dev);
1355 return spi_controller_resume(rspi->ctlr);
1358 static SIMPLE_DEV_PM_OPS(rspi_pm_ops, rspi_suspend, rspi_resume);
1359 #define DEV_PM_OPS &rspi_pm_ops
1361 #define DEV_PM_OPS NULL
1362 #endif /* CONFIG_PM_SLEEP */
1364 static struct platform_driver rspi_driver = {
1365 .probe = rspi_probe,
1366 .remove = rspi_remove,
1367 .id_table = spi_driver_ids,
1369 .name = "renesas_spi",
1371 .of_match_table = of_match_ptr(rspi_of_match),
1374 module_platform_driver(rspi_driver);
1376 MODULE_DESCRIPTION("Renesas RSPI bus driver");
1377 MODULE_LICENSE("GPL v2");
1378 MODULE_AUTHOR("Yoshihiro Shimoda");
1379 MODULE_ALIAS("platform:rspi");