4 * Copyright (C) 2012 Renesas Solutions Corp.
7 * Copyright (C) 2011 Renesas Solutions Corp.
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; version 2 of the License.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
24 #include <linux/module.h>
25 #include <linux/kernel.h>
26 #include <linux/sched.h>
27 #include <linux/errno.h>
28 #include <linux/interrupt.h>
29 #include <linux/platform_device.h>
31 #include <linux/clk.h>
32 #include <linux/dmaengine.h>
33 #include <linux/dma-mapping.h>
34 #include <linux/sh_dma.h>
35 #include <linux/spi/spi.h>
36 #include <linux/spi/rspi.h>
38 #define RSPI_SPCR 0x00 /* Control Register */
39 #define RSPI_SSLP 0x01 /* Slave Select Polarity Register */
40 #define RSPI_SPPCR 0x02 /* Pin Control Register */
41 #define RSPI_SPSR 0x03 /* Status Register */
42 #define RSPI_SPDR 0x04 /* Data Register */
43 #define RSPI_SPSCR 0x08 /* Sequence Control Register */
44 #define RSPI_SPSSR 0x09 /* Sequence Status Register */
45 #define RSPI_SPBR 0x0a /* Bit Rate Register */
46 #define RSPI_SPDCR 0x0b /* Data Control Register */
47 #define RSPI_SPCKD 0x0c /* Clock Delay Register */
48 #define RSPI_SSLND 0x0d /* Slave Select Negation Delay Register */
49 #define RSPI_SPND 0x0e /* Next-Access Delay Register */
50 #define RSPI_SPCR2 0x0f /* Control Register 2 */
51 #define RSPI_SPCMD0 0x10 /* Command Register 0 */
52 #define RSPI_SPCMD1 0x12 /* Command Register 1 */
53 #define RSPI_SPCMD2 0x14 /* Command Register 2 */
54 #define RSPI_SPCMD3 0x16 /* Command Register 3 */
55 #define RSPI_SPCMD4 0x18 /* Command Register 4 */
56 #define RSPI_SPCMD5 0x1a /* Command Register 5 */
57 #define RSPI_SPCMD6 0x1c /* Command Register 6 */
58 #define RSPI_SPCMD7 0x1e /* Command Register 7 */
59 #define RSPI_SPBFCR 0x20 /* Buffer Control Register */
60 #define RSPI_SPBFDR 0x22 /* Buffer Data Count Setting Register */
63 #define QSPI_SPBFCR 0x18 /* Buffer Control Register */
64 #define QSPI_SPBDCR 0x1a /* Buffer Data Count Register */
65 #define QSPI_SPBMUL0 0x1c /* Transfer Data Length Multiplier Setting Register 0 */
66 #define QSPI_SPBMUL1 0x20 /* Transfer Data Length Multiplier Setting Register 1 */
67 #define QSPI_SPBMUL2 0x24 /* Transfer Data Length Multiplier Setting Register 2 */
68 #define QSPI_SPBMUL3 0x28 /* Transfer Data Length Multiplier Setting Register 3 */
70 /* SPCR - Control Register */
71 #define SPCR_SPRIE 0x80 /* Receive Interrupt Enable */
72 #define SPCR_SPE 0x40 /* Function Enable */
73 #define SPCR_SPTIE 0x20 /* Transmit Interrupt Enable */
74 #define SPCR_SPEIE 0x10 /* Error Interrupt Enable */
75 #define SPCR_MSTR 0x08 /* Master/Slave Mode Select */
76 #define SPCR_MODFEN 0x04 /* Mode Fault Error Detection Enable */
78 #define SPCR_TXMD 0x02 /* TX Only Mode (vs. Full Duplex) */
79 #define SPCR_SPMS 0x01 /* 3-wire Mode (vs. 4-wire) */
80 /* QSPI on R-Car M2 only */
81 #define SPCR_WSWAP 0x02 /* Word Swap of read-data for DMAC */
82 #define SPCR_BSWAP 0x01 /* Byte Swap of read-data for DMAC */
84 /* SSLP - Slave Select Polarity Register */
85 #define SSLP_SSL1P 0x02 /* SSL1 Signal Polarity Setting */
86 #define SSLP_SSL0P 0x01 /* SSL0 Signal Polarity Setting */
88 /* SPPCR - Pin Control Register */
89 #define SPPCR_MOIFE 0x20 /* MOSI Idle Value Fixing Enable */
90 #define SPPCR_MOIFV 0x10 /* MOSI Idle Fixed Value */
91 #define SPPCR_SPOM 0x04
92 #define SPPCR_SPLP2 0x02 /* Loopback Mode 2 (non-inverting) */
93 #define SPPCR_SPLP 0x01 /* Loopback Mode (inverting) */
95 #define SPPCR_IO3FV 0x04 /* Single-/Dual-SPI Mode IO3 Output Fixed Value */
96 #define SPPCR_IO2FV 0x04 /* Single-/Dual-SPI Mode IO2 Output Fixed Value */
98 /* SPSR - Status Register */
99 #define SPSR_SPRF 0x80 /* Receive Buffer Full Flag */
100 #define SPSR_TEND 0x40 /* Transmit End */
101 #define SPSR_SPTEF 0x20 /* Transmit Buffer Empty Flag */
102 #define SPSR_PERF 0x08 /* Parity Error Flag */
103 #define SPSR_MODF 0x04 /* Mode Fault Error Flag */
104 #define SPSR_IDLNF 0x02 /* RSPI Idle Flag */
105 #define SPSR_OVRF 0x01 /* Overrun Error Flag */
107 /* SPSCR - Sequence Control Register */
108 #define SPSCR_SPSLN_MASK 0x07 /* Sequence Length Specification */
110 /* SPSSR - Sequence Status Register */
111 #define SPSSR_SPECM_MASK 0x70 /* Command Error Mask */
112 #define SPSSR_SPCP_MASK 0x07 /* Command Pointer Mask */
114 /* SPDCR - Data Control Register */
115 #define SPDCR_TXDMY 0x80 /* Dummy Data Transmission Enable */
116 #define SPDCR_SPLW1 0x40 /* Access Width Specification (RZ) */
117 #define SPDCR_SPLW0 0x20 /* Access Width Specification (RZ) */
118 #define SPDCR_SPLLWORD (SPDCR_SPLW1 | SPDCR_SPLW0)
119 #define SPDCR_SPLWORD SPDCR_SPLW1
120 #define SPDCR_SPLBYTE SPDCR_SPLW0
121 #define SPDCR_SPLW 0x20 /* Access Width Specification (SH) */
122 #define SPDCR_SPRDTD 0x10 /* Receive Transmit Data Select */
123 #define SPDCR_SLSEL1 0x08
124 #define SPDCR_SLSEL0 0x04
125 #define SPDCR_SLSEL_MASK 0x0c /* SSL1 Output Select */
126 #define SPDCR_SPFC1 0x02
127 #define SPDCR_SPFC0 0x01
128 #define SPDCR_SPFC_MASK 0x03 /* Frame Count Setting (1-4) */
130 /* SPCKD - Clock Delay Register */
131 #define SPCKD_SCKDL_MASK 0x07 /* Clock Delay Setting (1-8) */
133 /* SSLND - Slave Select Negation Delay Register */
134 #define SSLND_SLNDL_MASK 0x07 /* SSL Negation Delay Setting (1-8) */
136 /* SPND - Next-Access Delay Register */
137 #define SPND_SPNDL_MASK 0x07 /* Next-Access Delay Setting (1-8) */
139 /* SPCR2 - Control Register 2 */
140 #define SPCR2_PTE 0x08 /* Parity Self-Test Enable */
141 #define SPCR2_SPIE 0x04 /* Idle Interrupt Enable */
142 #define SPCR2_SPOE 0x02 /* Odd Parity Enable (vs. Even) */
143 #define SPCR2_SPPE 0x01 /* Parity Enable */
145 /* SPCMDn - Command Registers */
146 #define SPCMD_SCKDEN 0x8000 /* Clock Delay Setting Enable */
147 #define SPCMD_SLNDEN 0x4000 /* SSL Negation Delay Setting Enable */
148 #define SPCMD_SPNDEN 0x2000 /* Next-Access Delay Enable */
149 #define SPCMD_LSBF 0x1000 /* LSB First */
150 #define SPCMD_SPB_MASK 0x0f00 /* Data Length Setting */
151 #define SPCMD_SPB_8_TO_16(bit) (((bit - 1) << 8) & SPCMD_SPB_MASK)
152 #define SPCMD_SPB_8BIT 0x0000 /* qspi only */
153 #define SPCMD_SPB_16BIT 0x0100
154 #define SPCMD_SPB_20BIT 0x0000
155 #define SPCMD_SPB_24BIT 0x0100
156 #define SPCMD_SPB_32BIT 0x0200
157 #define SPCMD_SSLKP 0x0080 /* SSL Signal Level Keeping */
158 #define SPCMD_SPIMOD_MASK 0x0060 /* SPI Operating Mode (QSPI only) */
159 #define SPCMD_SPIMOD1 0x0040
160 #define SPCMD_SPIMOD0 0x0020
161 #define SPCMD_SPIMOD_SINGLE 0
162 #define SPCMD_SPIMOD_DUAL SPCMD_SPIMOD0
163 #define SPCMD_SPIMOD_QUAD SPCMD_SPIMOD1
164 #define SPCMD_SPRW 0x0010 /* SPI Read/Write Access (Dual/Quad) */
165 #define SPCMD_SSLA_MASK 0x0030 /* SSL Assert Signal Setting (RSPI) */
166 #define SPCMD_BRDV_MASK 0x000c /* Bit Rate Division Setting */
167 #define SPCMD_CPOL 0x0002 /* Clock Polarity Setting */
168 #define SPCMD_CPHA 0x0001 /* Clock Phase Setting */
170 /* SPBFCR - Buffer Control Register */
171 #define SPBFCR_TXRST 0x80 /* Transmit Buffer Data Reset (qspi only) */
172 #define SPBFCR_RXRST 0x40 /* Receive Buffer Data Reset (qspi only) */
173 #define SPBFCR_TXTRG_MASK 0x30 /* Transmit Buffer Data Triggering Number */
174 #define SPBFCR_RXTRG_MASK 0x07 /* Receive Buffer Data Triggering Number */
176 #define DUMMY_DATA 0x00
181 struct spi_master *master;
182 wait_queue_head_t wait;
186 const struct spi_ops *ops;
189 struct dma_chan *chan_tx;
190 struct dma_chan *chan_rx;
193 unsigned dma_width_16bit:1;
194 unsigned dma_callbacked:1;
195 unsigned byte_access:1;
198 static void rspi_write8(const struct rspi_data *rspi, u8 data, u16 offset)
200 iowrite8(data, rspi->addr + offset);
203 static void rspi_write16(const struct rspi_data *rspi, u16 data, u16 offset)
205 iowrite16(data, rspi->addr + offset);
208 static void rspi_write32(const struct rspi_data *rspi, u32 data, u16 offset)
210 iowrite32(data, rspi->addr + offset);
213 static u8 rspi_read8(const struct rspi_data *rspi, u16 offset)
215 return ioread8(rspi->addr + offset);
218 static u16 rspi_read16(const struct rspi_data *rspi, u16 offset)
220 return ioread16(rspi->addr + offset);
223 static void rspi_write_data(const struct rspi_data *rspi, u16 data)
225 if (rspi->byte_access)
226 rspi_write8(rspi, data, RSPI_SPDR);
228 rspi_write16(rspi, data, RSPI_SPDR);
231 static u16 rspi_read_data(const struct rspi_data *rspi)
233 if (rspi->byte_access)
234 return rspi_read8(rspi, RSPI_SPDR);
236 return rspi_read16(rspi, RSPI_SPDR);
239 /* optional functions */
241 int (*set_config_register)(struct rspi_data *rspi, int access_size);
242 int (*transfer_one)(struct spi_master *master, struct spi_device *spi,
243 struct spi_transfer *xfer);
249 static int rspi_set_config_register(struct rspi_data *rspi, int access_size)
253 /* Sets output mode(CMOS) and MOSI signal(from previous transfer) */
254 rspi_write8(rspi, 0x00, RSPI_SPPCR);
256 /* Sets transfer bit rate */
257 spbr = clk_get_rate(rspi->clk) / (2 * rspi->max_speed_hz) - 1;
258 rspi_write8(rspi, clamp(spbr, 0, 255), RSPI_SPBR);
260 /* Disable dummy transmission, set 16-bit word access, 1 frame */
261 rspi_write8(rspi, 0, RSPI_SPDCR);
262 rspi->byte_access = 0;
264 /* Sets RSPCK, SSL, next-access delay value */
265 rspi_write8(rspi, 0x00, RSPI_SPCKD);
266 rspi_write8(rspi, 0x00, RSPI_SSLND);
267 rspi_write8(rspi, 0x00, RSPI_SPND);
269 /* Sets parity, interrupt mask */
270 rspi_write8(rspi, 0x00, RSPI_SPCR2);
273 rspi_write16(rspi, SPCMD_SPB_8_TO_16(access_size) | rspi->spcmd,
277 rspi_write8(rspi, SPCR_MSTR, RSPI_SPCR);
285 static int qspi_set_config_register(struct rspi_data *rspi, int access_size)
290 /* Sets output mode(CMOS) and MOSI signal(from previous transfer) */
291 rspi_write8(rspi, 0x00, RSPI_SPPCR);
293 /* Sets transfer bit rate */
294 spbr = clk_get_rate(rspi->clk) / (2 * rspi->max_speed_hz);
295 rspi_write8(rspi, clamp(spbr, 0, 255), RSPI_SPBR);
297 /* Disable dummy transmission, set byte access */
298 rspi_write8(rspi, 0, RSPI_SPDCR);
299 rspi->byte_access = 1;
301 /* Sets RSPCK, SSL, next-access delay value */
302 rspi_write8(rspi, 0x00, RSPI_SPCKD);
303 rspi_write8(rspi, 0x00, RSPI_SSLND);
304 rspi_write8(rspi, 0x00, RSPI_SPND);
306 /* Data Length Setting */
307 if (access_size == 8)
308 spcmd = SPCMD_SPB_8BIT;
309 else if (access_size == 16)
310 spcmd = SPCMD_SPB_16BIT;
312 spcmd = SPCMD_SPB_32BIT;
314 spcmd |= SPCMD_SCKDEN | SPCMD_SLNDEN | rspi->spcmd | SPCMD_SPNDEN;
316 /* Resets transfer data length */
317 rspi_write32(rspi, 0, QSPI_SPBMUL0);
319 /* Resets transmit and receive buffer */
320 rspi_write8(rspi, SPBFCR_TXRST | SPBFCR_RXRST, QSPI_SPBFCR);
321 /* Sets buffer to allow normal operation */
322 rspi_write8(rspi, 0x00, QSPI_SPBFCR);
325 rspi_write16(rspi, spcmd, RSPI_SPCMD0);
327 /* Enables SPI function in a master mode */
328 rspi_write8(rspi, SPCR_SPE | SPCR_MSTR, RSPI_SPCR);
333 #define set_config_register(spi, n) spi->ops->set_config_register(spi, n)
335 static void rspi_enable_irq(const struct rspi_data *rspi, u8 enable)
337 rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) | enable, RSPI_SPCR);
340 static void rspi_disable_irq(const struct rspi_data *rspi, u8 disable)
342 rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) & ~disable, RSPI_SPCR);
345 static int rspi_wait_for_interrupt(struct rspi_data *rspi, u8 wait_mask,
350 rspi->spsr = rspi_read8(rspi, RSPI_SPSR);
351 rspi_enable_irq(rspi, enable_bit);
352 ret = wait_event_timeout(rspi->wait, rspi->spsr & wait_mask, HZ);
353 if (ret == 0 && !(rspi->spsr & wait_mask))
359 static int rspi_data_out(struct rspi_data *rspi, u8 data)
361 if (rspi_wait_for_interrupt(rspi, SPSR_SPTEF, SPCR_SPTIE) < 0) {
362 dev_err(&rspi->master->dev, "transmit timeout\n");
365 rspi_write_data(rspi, data);
369 static int rspi_data_in(struct rspi_data *rspi)
373 if (rspi_wait_for_interrupt(rspi, SPSR_SPRF, SPCR_SPRIE) < 0) {
374 dev_err(&rspi->master->dev, "receive timeout\n");
377 data = rspi_read_data(rspi);
381 static int rspi_data_out_in(struct rspi_data *rspi, u8 data)
385 ret = rspi_data_out(rspi, data);
389 return rspi_data_in(rspi);
392 static void rspi_dma_complete(void *arg)
394 struct rspi_data *rspi = arg;
396 rspi->dma_callbacked = 1;
397 wake_up_interruptible(&rspi->wait);
400 static int rspi_dma_map_sg(struct scatterlist *sg, const void *buf,
401 unsigned len, struct dma_chan *chan,
402 enum dma_transfer_direction dir)
404 sg_init_table(sg, 1);
405 sg_set_buf(sg, buf, len);
406 sg_dma_len(sg) = len;
407 return dma_map_sg(chan->device->dev, sg, 1, dir);
410 static void rspi_dma_unmap_sg(struct scatterlist *sg, struct dma_chan *chan,
411 enum dma_transfer_direction dir)
413 dma_unmap_sg(chan->device->dev, sg, 1, dir);
416 static void rspi_memory_to_8bit(void *buf, const void *data, unsigned len)
419 const u8 *src = data;
422 *dst++ = (u16)(*src++);
427 static void rspi_memory_from_8bit(void *buf, const void *data, unsigned len)
430 const u16 *src = data;
438 static int rspi_send_dma(struct rspi_data *rspi, struct spi_transfer *t)
440 struct scatterlist sg;
441 const void *buf = NULL;
442 struct dma_async_tx_descriptor *desc;
446 if (rspi->dma_width_16bit) {
449 * If DMAC bus width is 16-bit, the driver allocates a dummy
450 * buffer. And, the driver converts original data into the
451 * DMAC data as the following format:
452 * original data: 1st byte, 2nd byte ...
453 * DMAC data: 1st byte, dummy, 2nd byte, dummy ...
456 tmp = kmalloc(len, GFP_KERNEL);
459 rspi_memory_to_8bit(tmp, t->tx_buf, t->len);
466 if (!rspi_dma_map_sg(&sg, buf, len, rspi->chan_tx, DMA_TO_DEVICE)) {
470 desc = dmaengine_prep_slave_sg(rspi->chan_tx, &sg, 1, DMA_TO_DEVICE,
471 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
478 * DMAC needs SPTIE, but if SPTIE is set, this IRQ routine will be
479 * called. So, this driver disables the IRQ while DMA transfer.
481 disable_irq(rspi->irq);
483 rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) | SPCR_TXMD, RSPI_SPCR);
484 rspi_enable_irq(rspi, SPCR_SPTIE);
485 rspi->dma_callbacked = 0;
487 desc->callback = rspi_dma_complete;
488 desc->callback_param = rspi;
489 dmaengine_submit(desc);
490 dma_async_issue_pending(rspi->chan_tx);
492 ret = wait_event_interruptible_timeout(rspi->wait,
493 rspi->dma_callbacked, HZ);
494 if (ret > 0 && rspi->dma_callbacked)
498 rspi_disable_irq(rspi, SPCR_SPTIE);
500 enable_irq(rspi->irq);
503 rspi_dma_unmap_sg(&sg, rspi->chan_tx, DMA_TO_DEVICE);
505 if (rspi->dma_width_16bit)
511 static void rspi_receive_init(const struct rspi_data *rspi)
515 spsr = rspi_read8(rspi, RSPI_SPSR);
516 if (spsr & SPSR_SPRF)
517 rspi_read_data(rspi); /* dummy read */
518 if (spsr & SPSR_OVRF)
519 rspi_write8(rspi, rspi_read8(rspi, RSPI_SPSR) & ~SPSR_OVRF,
523 static void qspi_receive_init(const struct rspi_data *rspi)
527 spsr = rspi_read8(rspi, RSPI_SPSR);
528 if (spsr & SPSR_SPRF)
529 rspi_read_data(rspi); /* dummy read */
530 rspi_write8(rspi, SPBFCR_TXRST | SPBFCR_RXRST, QSPI_SPBFCR);
531 rspi_write8(rspi, 0, QSPI_SPBFCR);
534 static int rspi_receive_dma(struct rspi_data *rspi, struct spi_transfer *t)
536 struct scatterlist sg, sg_dummy;
537 void *dummy = NULL, *rx_buf = NULL;
538 struct dma_async_tx_descriptor *desc, *desc_dummy;
542 if (rspi->dma_width_16bit) {
544 * If DMAC bus width is 16-bit, the driver allocates a dummy
545 * buffer. And, finally the driver converts the DMAC data into
546 * actual data as the following format:
547 * DMAC data: 1st byte, dummy, 2nd byte, dummy ...
548 * actual data: 1st byte, 2nd byte ...
551 rx_buf = kmalloc(len, GFP_KERNEL);
559 /* prepare dummy transfer to generate SPI clocks */
560 dummy = kzalloc(len, GFP_KERNEL);
565 if (!rspi_dma_map_sg(&sg_dummy, dummy, len, rspi->chan_tx,
570 desc_dummy = dmaengine_prep_slave_sg(rspi->chan_tx, &sg_dummy, 1,
571 DMA_TO_DEVICE, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
574 goto end_dummy_mapped;
577 /* prepare receive transfer */
578 if (!rspi_dma_map_sg(&sg, rx_buf, len, rspi->chan_rx,
581 goto end_dummy_mapped;
584 desc = dmaengine_prep_slave_sg(rspi->chan_rx, &sg, 1, DMA_FROM_DEVICE,
585 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
591 rspi_receive_init(rspi);
594 * DMAC needs SPTIE, but if SPTIE is set, this IRQ routine will be
595 * called. So, this driver disables the IRQ while DMA transfer.
597 disable_irq(rspi->irq);
599 rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) & ~SPCR_TXMD, RSPI_SPCR);
600 rspi_enable_irq(rspi, SPCR_SPTIE | SPCR_SPRIE);
601 rspi->dma_callbacked = 0;
603 desc->callback = rspi_dma_complete;
604 desc->callback_param = rspi;
605 dmaengine_submit(desc);
606 dma_async_issue_pending(rspi->chan_rx);
608 desc_dummy->callback = NULL; /* No callback */
609 dmaengine_submit(desc_dummy);
610 dma_async_issue_pending(rspi->chan_tx);
612 ret = wait_event_interruptible_timeout(rspi->wait,
613 rspi->dma_callbacked, HZ);
614 if (ret > 0 && rspi->dma_callbacked)
618 rspi_disable_irq(rspi, SPCR_SPTIE | SPCR_SPRIE);
620 enable_irq(rspi->irq);
623 rspi_dma_unmap_sg(&sg, rspi->chan_rx, DMA_FROM_DEVICE);
625 rspi_dma_unmap_sg(&sg_dummy, rspi->chan_tx, DMA_TO_DEVICE);
627 if (rspi->dma_width_16bit) {
629 rspi_memory_from_8bit(t->rx_buf, rx_buf, t->len);
637 static int rspi_is_dma(const struct rspi_data *rspi, struct spi_transfer *t)
639 if (t->tx_buf && rspi->chan_tx)
641 /* If the module receives data by DMAC, it also needs TX DMAC */
642 if (t->rx_buf && rspi->chan_tx && rspi->chan_rx)
648 static int rspi_transfer_out_in(struct rspi_data *rspi,
649 struct spi_transfer *xfer)
651 int remain = xfer->len, ret;
652 const u8 *tx_buf = xfer->tx_buf;
653 u8 *rx_buf = xfer->rx_buf;
656 rspi_receive_init(rspi);
658 spcr = rspi_read8(rspi, RSPI_SPCR);
663 rspi_write8(rspi, spcr, RSPI_SPCR);
666 data = tx_buf ? *tx_buf++ : DUMMY_DATA;
667 ret = rspi_data_out(rspi, data);
671 ret = rspi_data_in(rspi);
679 /* Wait for the last transmission */
680 rspi_wait_for_interrupt(rspi, SPSR_SPTEF, SPCR_SPTIE);
685 static int rspi_transfer_one(struct spi_master *master, struct spi_device *spi,
686 struct spi_transfer *xfer)
688 struct rspi_data *rspi = spi_master_get_devdata(master);
691 if (!rspi_is_dma(rspi, xfer))
692 return rspi_transfer_out_in(rspi, xfer);
695 ret = rspi_send_dma(rspi, xfer);
700 return rspi_receive_dma(rspi, xfer);
705 static int qspi_transfer_out_in(struct rspi_data *rspi,
706 struct spi_transfer *xfer)
708 int remain = xfer->len, ret;
709 const u8 *tx_buf = xfer->tx_buf;
710 u8 *rx_buf = xfer->rx_buf;
713 qspi_receive_init(rspi);
716 data = tx_buf ? *tx_buf++ : DUMMY_DATA;
717 ret = rspi_data_out_in(rspi, data);
725 /* Wait for the last transmission */
726 rspi_wait_for_interrupt(rspi, SPSR_SPTEF, SPCR_SPTIE);
731 static int qspi_transfer_one(struct spi_master *master, struct spi_device *spi,
732 struct spi_transfer *xfer)
734 struct rspi_data *rspi = spi_master_get_devdata(master);
736 return qspi_transfer_out_in(rspi, xfer);
739 static int rspi_setup(struct spi_device *spi)
741 struct rspi_data *rspi = spi_master_get_devdata(spi->master);
743 rspi->max_speed_hz = spi->max_speed_hz;
745 rspi->spcmd = SPCMD_SSLKP;
746 if (spi->mode & SPI_CPOL)
747 rspi->spcmd |= SPCMD_CPOL;
748 if (spi->mode & SPI_CPHA)
749 rspi->spcmd |= SPCMD_CPHA;
751 set_config_register(rspi, 8);
756 static void rspi_cleanup(struct spi_device *spi)
760 static int rspi_prepare_message(struct spi_master *master,
761 struct spi_message *message)
763 struct rspi_data *rspi = spi_master_get_devdata(master);
765 rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) | SPCR_SPE, RSPI_SPCR);
769 static int rspi_unprepare_message(struct spi_master *master,
770 struct spi_message *message)
772 struct rspi_data *rspi = spi_master_get_devdata(master);
774 rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) & ~SPCR_SPE, RSPI_SPCR);
778 static irqreturn_t rspi_irq(int irq, void *_sr)
780 struct rspi_data *rspi = _sr;
782 irqreturn_t ret = IRQ_NONE;
785 rspi->spsr = spsr = rspi_read8(rspi, RSPI_SPSR);
786 if (spsr & SPSR_SPRF)
787 disable_irq |= SPCR_SPRIE;
788 if (spsr & SPSR_SPTEF)
789 disable_irq |= SPCR_SPTIE;
793 rspi_disable_irq(rspi, disable_irq);
794 wake_up(&rspi->wait);
800 static int rspi_request_dma(struct rspi_data *rspi,
801 struct platform_device *pdev)
803 const struct rspi_plat_data *rspi_pd = dev_get_platdata(&pdev->dev);
804 struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
806 struct dma_slave_config cfg;
809 if (!res || !rspi_pd)
810 return 0; /* The driver assumes no error. */
812 rspi->dma_width_16bit = rspi_pd->dma_width_16bit;
814 /* If the module receives data by DMAC, it also needs TX DMAC */
815 if (rspi_pd->dma_rx_id && rspi_pd->dma_tx_id) {
817 dma_cap_set(DMA_SLAVE, mask);
818 rspi->chan_rx = dma_request_channel(mask, shdma_chan_filter,
819 (void *)rspi_pd->dma_rx_id);
821 cfg.slave_id = rspi_pd->dma_rx_id;
822 cfg.direction = DMA_DEV_TO_MEM;
824 cfg.src_addr = res->start + RSPI_SPDR;
825 ret = dmaengine_slave_config(rspi->chan_rx, &cfg);
827 dev_info(&pdev->dev, "Use DMA when rx.\n");
832 if (rspi_pd->dma_tx_id) {
834 dma_cap_set(DMA_SLAVE, mask);
835 rspi->chan_tx = dma_request_channel(mask, shdma_chan_filter,
836 (void *)rspi_pd->dma_tx_id);
838 cfg.slave_id = rspi_pd->dma_tx_id;
839 cfg.direction = DMA_MEM_TO_DEV;
840 cfg.dst_addr = res->start + RSPI_SPDR;
842 ret = dmaengine_slave_config(rspi->chan_tx, &cfg);
844 dev_info(&pdev->dev, "Use DMA when tx\n");
853 static void rspi_release_dma(struct rspi_data *rspi)
856 dma_release_channel(rspi->chan_tx);
858 dma_release_channel(rspi->chan_rx);
861 static int rspi_remove(struct platform_device *pdev)
863 struct rspi_data *rspi = platform_get_drvdata(pdev);
865 rspi_release_dma(rspi);
866 clk_disable(rspi->clk);
871 static int rspi_probe(struct platform_device *pdev)
873 struct resource *res;
874 struct spi_master *master;
875 struct rspi_data *rspi;
878 const struct rspi_plat_data *rspi_pd = dev_get_platdata(&pdev->dev);
879 const struct spi_ops *ops;
880 const struct platform_device_id *id_entry = pdev->id_entry;
882 ops = (struct spi_ops *)id_entry->driver_data;
883 /* ops parameter check */
884 if (!ops->set_config_register) {
885 dev_err(&pdev->dev, "there is no set_config_register\n");
889 irq = platform_get_irq(pdev, 0);
891 dev_err(&pdev->dev, "platform_get_irq error\n");
895 master = spi_alloc_master(&pdev->dev, sizeof(struct rspi_data));
896 if (master == NULL) {
897 dev_err(&pdev->dev, "spi_alloc_master error.\n");
901 rspi = spi_master_get_devdata(master);
902 platform_set_drvdata(pdev, rspi);
904 rspi->master = master;
906 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
907 rspi->addr = devm_ioremap_resource(&pdev->dev, res);
908 if (IS_ERR(rspi->addr)) {
909 ret = PTR_ERR(rspi->addr);
913 snprintf(clk_name, sizeof(clk_name), "%s%d", id_entry->name, pdev->id);
914 rspi->clk = devm_clk_get(&pdev->dev, clk_name);
915 if (IS_ERR(rspi->clk)) {
916 dev_err(&pdev->dev, "cannot get clock\n");
917 ret = PTR_ERR(rspi->clk);
920 clk_enable(rspi->clk);
922 init_waitqueue_head(&rspi->wait);
924 if (rspi_pd && rspi_pd->num_chipselect)
925 master->num_chipselect = rspi_pd->num_chipselect;
927 master->num_chipselect = 2; /* default */
929 master->bus_num = pdev->id;
930 master->setup = rspi_setup;
931 master->transfer_one = ops->transfer_one;
932 master->cleanup = rspi_cleanup;
933 master->prepare_message = rspi_prepare_message;
934 master->unprepare_message = rspi_unprepare_message;
935 master->mode_bits = SPI_CPHA | SPI_CPOL;
937 ret = devm_request_irq(&pdev->dev, irq, rspi_irq, 0,
938 dev_name(&pdev->dev), rspi);
940 dev_err(&pdev->dev, "request_irq error\n");
945 ret = rspi_request_dma(rspi, pdev);
947 dev_err(&pdev->dev, "rspi_request_dma failed.\n");
951 ret = devm_spi_register_master(&pdev->dev, master);
953 dev_err(&pdev->dev, "spi_register_master error.\n");
957 dev_info(&pdev->dev, "probed\n");
962 rspi_release_dma(rspi);
964 clk_disable(rspi->clk);
966 spi_master_put(master);
971 static struct spi_ops rspi_ops = {
972 .set_config_register = rspi_set_config_register,
973 .transfer_one = rspi_transfer_one,
976 static struct spi_ops qspi_ops = {
977 .set_config_register = qspi_set_config_register,
978 .transfer_one = qspi_transfer_one,
981 static struct platform_device_id spi_driver_ids[] = {
982 { "rspi", (kernel_ulong_t)&rspi_ops },
983 { "qspi", (kernel_ulong_t)&qspi_ops },
987 MODULE_DEVICE_TABLE(platform, spi_driver_ids);
989 static struct platform_driver rspi_driver = {
991 .remove = rspi_remove,
992 .id_table = spi_driver_ids,
994 .name = "renesas_spi",
995 .owner = THIS_MODULE,
998 module_platform_driver(rspi_driver);
1000 MODULE_DESCRIPTION("Renesas RSPI bus driver");
1001 MODULE_LICENSE("GPL v2");
1002 MODULE_AUTHOR("Yoshihiro Shimoda");
1003 MODULE_ALIAS("platform:rspi");