1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Broadcom BCM63xx SPI controller support
4 *
5 * Copyright (C) 2009-2012 Florian Fainelli <florian@openwrt.org>
6 * Copyright (C) 2010 Tanguy Bouzeloc <tanguy.bouzeloc@efixo.com>
7 */
8
9 #include <linux/kernel.h>
10 #include <linux/clk.h>
11 #include <linux/io.h>
12 #include <linux/module.h>
13 #include <linux/platform_device.h>
14 #include <linux/delay.h>
15 #include <linux/interrupt.h>
16 #include <linux/spi/spi.h>
17 #include <linux/completion.h>
18 #include <linux/err.h>
19 #include <linux/pm_runtime.h>
20 #include <linux/of.h>
21 #include <linux/reset.h>
22
23 /* BCM 6338/6348 SPI core */
24 #define SPI_6348_RSET_SIZE 64
25 #define SPI_6348_CMD 0x00 /* 16-bits register */
26 #define SPI_6348_INT_STATUS 0x02
27 #define SPI_6348_INT_MASK_ST 0x03
28 #define SPI_6348_INT_MASK 0x04
29 #define SPI_6348_ST 0x05
30 #define SPI_6348_CLK_CFG 0x06
31 #define SPI_6348_FILL_BYTE 0x07
32 #define SPI_6348_MSG_TAIL 0x09
33 #define SPI_6348_RX_TAIL 0x0b
34 #define SPI_6348_MSG_CTL 0x40 /* 8-bits register */
35 #define SPI_6348_MSG_CTL_WIDTH 8
36 #define SPI_6348_MSG_DATA 0x41
37 #define SPI_6348_MSG_DATA_SIZE 0x3f
38 #define SPI_6348_RX_DATA 0x80
39 #define SPI_6348_RX_DATA_SIZE 0x3f
40
41 /* BCM 3368/6358/6262/6368 SPI core */
42 #define SPI_6358_RSET_SIZE 1804
43 #define SPI_6358_MSG_CTL 0x00 /* 16-bits register */
44 #define SPI_6358_MSG_CTL_WIDTH 16
45 #define SPI_6358_MSG_DATA 0x02
46 #define SPI_6358_MSG_DATA_SIZE 0x21e
47 #define SPI_6358_RX_DATA 0x400
48 #define SPI_6358_RX_DATA_SIZE 0x220
49 #define SPI_6358_CMD 0x700 /* 16-bits register */
50 #define SPI_6358_INT_STATUS 0x702
51 #define SPI_6358_INT_MASK_ST 0x703
52 #define SPI_6358_INT_MASK 0x704
53 #define SPI_6358_ST 0x705
54 #define SPI_6358_CLK_CFG 0x706
55 #define SPI_6358_FILL_BYTE 0x707
56 #define SPI_6358_MSG_TAIL 0x709
57 #define SPI_6358_RX_TAIL 0x70B
58
59 /* Shared SPI definitions */
60
61 /* Message configuration */
62 #define SPI_FD_RW 0x00
63 #define SPI_HD_W 0x01
64 #define SPI_HD_R 0x02
65 #define SPI_BYTE_CNT_SHIFT 0
66 #define SPI_6348_MSG_TYPE_SHIFT 6
67 #define SPI_6358_MSG_TYPE_SHIFT 14
68
69 /* Command */
70 #define SPI_CMD_NOOP 0x00
71 #define SPI_CMD_SOFT_RESET 0x01
72 #define SPI_CMD_HARD_RESET 0x02
73 #define SPI_CMD_START_IMMEDIATE 0x03
74 #define SPI_CMD_COMMAND_SHIFT 0
75 #define SPI_CMD_COMMAND_MASK 0x000f
76 #define SPI_CMD_DEVICE_ID_SHIFT 4
77 #define SPI_CMD_PREPEND_BYTE_CNT_SHIFT 8
78 #define SPI_CMD_ONE_BYTE_SHIFT 11
79 #define SPI_CMD_ONE_WIRE_SHIFT 12
80 #define SPI_DEV_ID_0 0
81 #define SPI_DEV_ID_1 1
82 #define SPI_DEV_ID_2 2
83 #define SPI_DEV_ID_3 3
84
85 /* Interrupt mask */
86 #define SPI_INTR_CMD_DONE 0x01
87 #define SPI_INTR_RX_OVERFLOW 0x02
88 #define SPI_INTR_TX_UNDERFLOW 0x04
89 #define SPI_INTR_TX_OVERFLOW 0x08
90 #define SPI_INTR_RX_UNDERFLOW 0x10
91 #define SPI_INTR_CLEAR_ALL 0x1f
92
93 /* Status */
94 #define SPI_RX_EMPTY 0x02
95 #define SPI_CMD_BUSY 0x04
96 #define SPI_SERIAL_BUSY 0x08
97
98 /* Clock configuration */
99 #define SPI_CLK_20MHZ 0x00
100 #define SPI_CLK_0_391MHZ 0x01
101 #define SPI_CLK_0_781MHZ 0x02 /* default */
102 #define SPI_CLK_1_563MHZ 0x03
103 #define SPI_CLK_3_125MHZ 0x04
104 #define SPI_CLK_6_250MHZ 0x05
105 #define SPI_CLK_12_50MHZ 0x06
106 #define SPI_CLK_MASK 0x07
107 #define SPI_SSOFFTIME_MASK 0x38
108 #define SPI_SSOFFTIME_SHIFT 3
109 #define SPI_BYTE_SWAP 0x80
110
111 enum bcm63xx_regs_spi {
112 SPI_CMD,
113 SPI_INT_STATUS,
114 SPI_INT_MASK_ST,
115 SPI_INT_MASK,
116 SPI_ST,
117 SPI_CLK_CFG,
118 SPI_FILL_BYTE,
119 SPI_MSG_TAIL,
120 SPI_RX_TAIL,
121 SPI_MSG_CTL,
122 SPI_MSG_DATA,
123 SPI_RX_DATA,
124 SPI_MSG_TYPE_SHIFT,
125 SPI_MSG_CTL_WIDTH,
126 SPI_MSG_DATA_SIZE,
127 };
128
129 #define BCM63XX_SPI_MAX_PREPEND 7
130
131 #define BCM63XX_SPI_MAX_CS 8
132 #define BCM63XX_SPI_BUS_NUM 0
133
134 struct bcm63xx_spi {
135 struct completion done;
136
137 void __iomem *regs;
138 int irq;
139
140 /* Platform data */
141 const unsigned long *reg_offsets;
142 unsigned int fifo_size;
143 unsigned int msg_type_shift;
144 unsigned int msg_ctl_width;
145
146 /* data iomem */
147 u8 __iomem *tx_io;
148 const u8 __iomem *rx_io;
149
150 struct clk *clk;
151 struct platform_device *pdev;
152 };
153
bcm_spi_readb(struct bcm63xx_spi * bs,unsigned int offset)154 static inline u8 bcm_spi_readb(struct bcm63xx_spi *bs,
155 unsigned int offset)
156 {
157 return readb(bs->regs + bs->reg_offsets[offset]);
158 }
159
bcm_spi_writeb(struct bcm63xx_spi * bs,u8 value,unsigned int offset)160 static inline void bcm_spi_writeb(struct bcm63xx_spi *bs,
161 u8 value, unsigned int offset)
162 {
163 writeb(value, bs->regs + bs->reg_offsets[offset]);
164 }
165
bcm_spi_writew(struct bcm63xx_spi * bs,u16 value,unsigned int offset)166 static inline void bcm_spi_writew(struct bcm63xx_spi *bs,
167 u16 value, unsigned int offset)
168 {
169 #ifdef CONFIG_CPU_BIG_ENDIAN
170 iowrite16be(value, bs->regs + bs->reg_offsets[offset]);
171 #else
172 writew(value, bs->regs + bs->reg_offsets[offset]);
173 #endif
174 }
175
176 static const unsigned int bcm63xx_spi_freq_table[SPI_CLK_MASK][2] = {
177 { 20000000, SPI_CLK_20MHZ },
178 { 12500000, SPI_CLK_12_50MHZ },
179 { 6250000, SPI_CLK_6_250MHZ },
180 { 3125000, SPI_CLK_3_125MHZ },
181 { 1563000, SPI_CLK_1_563MHZ },
182 { 781000, SPI_CLK_0_781MHZ },
183 { 391000, SPI_CLK_0_391MHZ }
184 };
185
bcm63xx_spi_setup_transfer(struct spi_device * spi,struct spi_transfer * t)186 static void bcm63xx_spi_setup_transfer(struct spi_device *spi,
187 struct spi_transfer *t)
188 {
189 struct bcm63xx_spi *bs = spi_controller_get_devdata(spi->controller);
190 u8 clk_cfg, reg;
191 int i;
192
193 /* Default to lowest clock configuration */
194 clk_cfg = SPI_CLK_0_391MHZ;
195
196 /* Find the closest clock configuration */
197 for (i = 0; i < SPI_CLK_MASK; i++) {
198 if (t->speed_hz >= bcm63xx_spi_freq_table[i][0]) {
199 clk_cfg = bcm63xx_spi_freq_table[i][1];
200 break;
201 }
202 }
203
204 /* clear existing clock configuration bits of the register */
205 reg = bcm_spi_readb(bs, SPI_CLK_CFG);
206 reg &= ~SPI_CLK_MASK;
207 reg |= clk_cfg;
208
209 bcm_spi_writeb(bs, reg, SPI_CLK_CFG);
210 dev_dbg(&spi->dev, "Setting clock register to %02x (hz %d)\n",
211 clk_cfg, t->speed_hz);
212 }
213
214 /* the spi->mode bits understood by this driver: */
215 #define MODEBITS (SPI_CPOL | SPI_CPHA)
216
bcm63xx_txrx_bufs(struct spi_device * spi,struct spi_transfer * first,unsigned int num_transfers)217 static int bcm63xx_txrx_bufs(struct spi_device *spi, struct spi_transfer *first,
218 unsigned int num_transfers)
219 {
220 struct bcm63xx_spi *bs = spi_controller_get_devdata(spi->controller);
221 u16 msg_ctl;
222 u16 cmd;
223 unsigned int i, timeout = 0, prepend_len = 0, len = 0;
224 struct spi_transfer *t = first;
225 bool do_rx = false;
226 bool do_tx = false;
227
228 /* Disable the CMD_DONE interrupt */
229 bcm_spi_writeb(bs, 0, SPI_INT_MASK);
230
231 dev_dbg(&spi->dev, "txrx: tx %p, rx %p, len %d\n",
232 t->tx_buf, t->rx_buf, t->len);
233
234 if (num_transfers > 1 && t->tx_buf && t->len <= BCM63XX_SPI_MAX_PREPEND)
235 prepend_len = t->len;
236
237 /* prepare the buffer */
238 for (i = 0; i < num_transfers; i++) {
239 if (t->tx_buf) {
240 do_tx = true;
241 memcpy_toio(bs->tx_io + len, t->tx_buf, t->len);
242
243 /* don't prepend more than one tx */
244 if (t != first)
245 prepend_len = 0;
246 }
247
248 if (t->rx_buf) {
249 do_rx = true;
250
251 /*
252 * In certain hardware implementations, there appears to be a
253 * hidden accumulator that tracks the number of bytes written into
254 * the hardware FIFO, and this accumulator overrides the length in
255 * the SPI_MSG_CTL register.
256 *
257 * Therefore, for read-only transfers, we need to write some dummy
258 * value into the FIFO to keep the accumulator tracking the correct
259 * length.
260 */
261 if (!t->tx_buf)
262 memset_io(bs->tx_io + len, 0xFF, t->len);
263
264 /* prepend is half-duplex write only */
265 if (t == first)
266 prepend_len = 0;
267 }
268
269 len += t->len;
270
271 t = list_entry(t->transfer_list.next, struct spi_transfer,
272 transfer_list);
273 }
274
275 reinit_completion(&bs->done);
276
277 /* Fill in the Message control register */
278 msg_ctl = (len << SPI_BYTE_CNT_SHIFT);
279
280 if (do_rx && do_tx && prepend_len == 0)
281 msg_ctl |= (SPI_FD_RW << bs->msg_type_shift);
282 else if (do_rx)
283 msg_ctl |= (SPI_HD_R << bs->msg_type_shift);
284 else if (do_tx)
285 msg_ctl |= (SPI_HD_W << bs->msg_type_shift);
286
287 switch (bs->msg_ctl_width) {
288 case 8:
289 bcm_spi_writeb(bs, msg_ctl, SPI_MSG_CTL);
290 break;
291 case 16:
292 bcm_spi_writew(bs, msg_ctl, SPI_MSG_CTL);
293 break;
294 }
295
296 /* Issue the transfer */
297 cmd = SPI_CMD_START_IMMEDIATE;
298 cmd |= (prepend_len << SPI_CMD_PREPEND_BYTE_CNT_SHIFT);
299 cmd |= (spi_get_chipselect(spi, 0) << SPI_CMD_DEVICE_ID_SHIFT);
300 bcm_spi_writew(bs, cmd, SPI_CMD);
301
302 /* Enable the CMD_DONE interrupt */
303 bcm_spi_writeb(bs, SPI_INTR_CMD_DONE, SPI_INT_MASK);
304
305 timeout = wait_for_completion_timeout(&bs->done, HZ);
306 if (!timeout)
307 return -ETIMEDOUT;
308
309 if (!do_rx)
310 return 0;
311
312 len = 0;
313 t = first;
314 /* Read out all the data */
315 for (i = 0; i < num_transfers; i++) {
316 if (t->rx_buf)
317 memcpy_fromio(t->rx_buf, bs->rx_io + len, t->len);
318
319 if (t != first || prepend_len == 0)
320 len += t->len;
321
322 t = list_entry(t->transfer_list.next, struct spi_transfer,
323 transfer_list);
324 }
325
326 return 0;
327 }
328
bcm63xx_spi_transfer_one(struct spi_controller * host,struct spi_message * m)329 static int bcm63xx_spi_transfer_one(struct spi_controller *host,
330 struct spi_message *m)
331 {
332 struct bcm63xx_spi *bs = spi_controller_get_devdata(host);
333 struct spi_transfer *t, *first = NULL;
334 struct spi_device *spi = m->spi;
335 int status = 0;
336 unsigned int n_transfers = 0, total_len = 0;
337 bool can_use_prepend = false;
338
339 /*
340 * This SPI controller does not support keeping CS active after a
341 * transfer.
342 * Work around this by merging as many transfers we can into one big
343 * full-duplex transfers.
344 */
345 list_for_each_entry(t, &m->transfers, transfer_list) {
346 if (!first)
347 first = t;
348
349 n_transfers++;
350 total_len += t->len;
351
352 if (n_transfers == 2 && !first->rx_buf && !t->tx_buf &&
353 first->len <= BCM63XX_SPI_MAX_PREPEND)
354 can_use_prepend = true;
355 else if (can_use_prepend && t->tx_buf)
356 can_use_prepend = false;
357
358 /* we can only transfer one fifo worth of data */
359 if ((can_use_prepend &&
360 total_len > (bs->fifo_size + BCM63XX_SPI_MAX_PREPEND)) ||
361 (!can_use_prepend && total_len > bs->fifo_size)) {
362 dev_err(&spi->dev, "unable to do transfers larger than FIFO size (%i > %i)\n",
363 total_len, bs->fifo_size);
364 status = -EINVAL;
365 goto exit;
366 }
367
368 /* all combined transfers have to have the same speed */
369 if (t->speed_hz != first->speed_hz) {
370 dev_err(&spi->dev, "unable to change speed between transfers\n");
371 status = -EINVAL;
372 goto exit;
373 }
374
375 /* CS will be deasserted directly after transfer */
376 if (t->delay.value) {
377 dev_err(&spi->dev, "unable to keep CS asserted after transfer\n");
378 status = -EINVAL;
379 goto exit;
380 }
381
382 if (t->cs_change ||
383 list_is_last(&t->transfer_list, &m->transfers)) {
384 /* configure adapter for a new transfer */
385 bcm63xx_spi_setup_transfer(spi, first);
386
387 /* send the data */
388 status = bcm63xx_txrx_bufs(spi, first, n_transfers);
389 if (status)
390 goto exit;
391
392 m->actual_length += total_len;
393
394 first = NULL;
395 n_transfers = 0;
396 total_len = 0;
397 can_use_prepend = false;
398 }
399 }
400 exit:
401 m->status = status;
402 spi_finalize_current_message(host);
403
404 return 0;
405 }
406
407 /* This driver supports single host mode only. Hence
408 * CMD_DONE is the only interrupt we care about
409 */
bcm63xx_spi_interrupt(int irq,void * dev_id)410 static irqreturn_t bcm63xx_spi_interrupt(int irq, void *dev_id)
411 {
412 struct spi_controller *host = (struct spi_controller *)dev_id;
413 struct bcm63xx_spi *bs = spi_controller_get_devdata(host);
414 u8 intr;
415
416 /* Read interupts and clear them immediately */
417 intr = bcm_spi_readb(bs, SPI_INT_STATUS);
418 bcm_spi_writeb(bs, SPI_INTR_CLEAR_ALL, SPI_INT_STATUS);
419 bcm_spi_writeb(bs, 0, SPI_INT_MASK);
420
421 /* A transfer completed */
422 if (intr & SPI_INTR_CMD_DONE)
423 complete(&bs->done);
424
425 return IRQ_HANDLED;
426 }
427
bcm63xx_spi_max_length(struct spi_device * spi)428 static size_t bcm63xx_spi_max_length(struct spi_device *spi)
429 {
430 struct bcm63xx_spi *bs = spi_controller_get_devdata(spi->controller);
431
432 return bs->fifo_size;
433 }
434
435 static const unsigned long bcm6348_spi_reg_offsets[] = {
436 [SPI_CMD] = SPI_6348_CMD,
437 [SPI_INT_STATUS] = SPI_6348_INT_STATUS,
438 [SPI_INT_MASK_ST] = SPI_6348_INT_MASK_ST,
439 [SPI_INT_MASK] = SPI_6348_INT_MASK,
440 [SPI_ST] = SPI_6348_ST,
441 [SPI_CLK_CFG] = SPI_6348_CLK_CFG,
442 [SPI_FILL_BYTE] = SPI_6348_FILL_BYTE,
443 [SPI_MSG_TAIL] = SPI_6348_MSG_TAIL,
444 [SPI_RX_TAIL] = SPI_6348_RX_TAIL,
445 [SPI_MSG_CTL] = SPI_6348_MSG_CTL,
446 [SPI_MSG_DATA] = SPI_6348_MSG_DATA,
447 [SPI_RX_DATA] = SPI_6348_RX_DATA,
448 [SPI_MSG_TYPE_SHIFT] = SPI_6348_MSG_TYPE_SHIFT,
449 [SPI_MSG_CTL_WIDTH] = SPI_6348_MSG_CTL_WIDTH,
450 [SPI_MSG_DATA_SIZE] = SPI_6348_MSG_DATA_SIZE,
451 };
452
453 static const unsigned long bcm6358_spi_reg_offsets[] = {
454 [SPI_CMD] = SPI_6358_CMD,
455 [SPI_INT_STATUS] = SPI_6358_INT_STATUS,
456 [SPI_INT_MASK_ST] = SPI_6358_INT_MASK_ST,
457 [SPI_INT_MASK] = SPI_6358_INT_MASK,
458 [SPI_ST] = SPI_6358_ST,
459 [SPI_CLK_CFG] = SPI_6358_CLK_CFG,
460 [SPI_FILL_BYTE] = SPI_6358_FILL_BYTE,
461 [SPI_MSG_TAIL] = SPI_6358_MSG_TAIL,
462 [SPI_RX_TAIL] = SPI_6358_RX_TAIL,
463 [SPI_MSG_CTL] = SPI_6358_MSG_CTL,
464 [SPI_MSG_DATA] = SPI_6358_MSG_DATA,
465 [SPI_RX_DATA] = SPI_6358_RX_DATA,
466 [SPI_MSG_TYPE_SHIFT] = SPI_6358_MSG_TYPE_SHIFT,
467 [SPI_MSG_CTL_WIDTH] = SPI_6358_MSG_CTL_WIDTH,
468 [SPI_MSG_DATA_SIZE] = SPI_6358_MSG_DATA_SIZE,
469 };
470
471 static const struct platform_device_id bcm63xx_spi_dev_match[] = {
472 {
473 .name = "bcm6348-spi",
474 .driver_data = (unsigned long)bcm6348_spi_reg_offsets,
475 },
476 {
477 .name = "bcm6358-spi",
478 .driver_data = (unsigned long)bcm6358_spi_reg_offsets,
479 },
480 {
481 },
482 };
483 MODULE_DEVICE_TABLE(platform, bcm63xx_spi_dev_match);
484
485 static const struct of_device_id bcm63xx_spi_of_match[] = {
486 { .compatible = "brcm,bcm6348-spi", .data = &bcm6348_spi_reg_offsets },
487 { .compatible = "brcm,bcm6358-spi", .data = &bcm6358_spi_reg_offsets },
488 { },
489 };
490 MODULE_DEVICE_TABLE(of, bcm63xx_spi_of_match);
491
bcm63xx_spi_probe(struct platform_device * pdev)492 static int bcm63xx_spi_probe(struct platform_device *pdev)
493 {
494 struct resource *r;
495 const unsigned long *bcm63xx_spireg;
496 struct device *dev = &pdev->dev;
497 int irq, bus_num;
498 struct spi_controller *host;
499 struct clk *clk;
500 struct bcm63xx_spi *bs;
501 int ret;
502 u32 num_cs = BCM63XX_SPI_MAX_CS;
503 struct reset_control *reset;
504
505 if (dev->of_node) {
506 const struct of_device_id *match;
507
508 match = of_match_node(bcm63xx_spi_of_match, dev->of_node);
509 if (!match)
510 return -EINVAL;
511 bcm63xx_spireg = match->data;
512
513 of_property_read_u32(dev->of_node, "num-cs", &num_cs);
514 if (num_cs > BCM63XX_SPI_MAX_CS) {
515 dev_warn(dev, "unsupported number of cs (%i), reducing to 8\n",
516 num_cs);
517 num_cs = BCM63XX_SPI_MAX_CS;
518 }
519
520 bus_num = -1;
521 } else if (pdev->id_entry->driver_data) {
522 const struct platform_device_id *match = pdev->id_entry;
523
524 bcm63xx_spireg = (const unsigned long *)match->driver_data;
525 bus_num = BCM63XX_SPI_BUS_NUM;
526 } else {
527 return -EINVAL;
528 }
529
530 irq = platform_get_irq(pdev, 0);
531 if (irq < 0)
532 return irq;
533
534 clk = devm_clk_get(dev, "spi");
535 if (IS_ERR(clk)) {
536 dev_err(dev, "no clock for device\n");
537 return PTR_ERR(clk);
538 }
539
540 reset = devm_reset_control_get_optional_shared(dev, NULL);
541 if (IS_ERR(reset))
542 return PTR_ERR(reset);
543
544 host = spi_alloc_host(dev, sizeof(*bs));
545 if (!host) {
546 dev_err(dev, "out of memory\n");
547 return -ENOMEM;
548 }
549
550 bs = spi_controller_get_devdata(host);
551 init_completion(&bs->done);
552
553 platform_set_drvdata(pdev, host);
554 bs->pdev = pdev;
555
556 bs->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &r);
557 if (IS_ERR(bs->regs)) {
558 ret = PTR_ERR(bs->regs);
559 goto out_err;
560 }
561
562 bs->irq = irq;
563 bs->clk = clk;
564 bs->reg_offsets = bcm63xx_spireg;
565 bs->fifo_size = bs->reg_offsets[SPI_MSG_DATA_SIZE];
566
567 ret = devm_request_irq(&pdev->dev, irq, bcm63xx_spi_interrupt, 0,
568 pdev->name, host);
569 if (ret) {
570 dev_err(dev, "unable to request irq\n");
571 goto out_err;
572 }
573
574 host->dev.of_node = dev->of_node;
575 host->bus_num = bus_num;
576 host->num_chipselect = num_cs;
577 host->transfer_one_message = bcm63xx_spi_transfer_one;
578 host->mode_bits = MODEBITS;
579 host->bits_per_word_mask = SPI_BPW_MASK(8);
580 host->max_transfer_size = bcm63xx_spi_max_length;
581 host->max_message_size = bcm63xx_spi_max_length;
582 host->auto_runtime_pm = true;
583 bs->msg_type_shift = bs->reg_offsets[SPI_MSG_TYPE_SHIFT];
584 bs->msg_ctl_width = bs->reg_offsets[SPI_MSG_CTL_WIDTH];
585 bs->tx_io = (u8 *)(bs->regs + bs->reg_offsets[SPI_MSG_DATA]);
586 bs->rx_io = (const u8 *)(bs->regs + bs->reg_offsets[SPI_RX_DATA]);
587
588 /* Initialize hardware */
589 ret = clk_prepare_enable(bs->clk);
590 if (ret)
591 goto out_err;
592
593 ret = reset_control_reset(reset);
594 if (ret) {
595 dev_err(dev, "unable to reset device: %d\n", ret);
596 goto out_clk_disable;
597 }
598
599 bcm_spi_writeb(bs, SPI_INTR_CLEAR_ALL, SPI_INT_STATUS);
600
601 ret = devm_pm_runtime_enable(&pdev->dev);
602 if (ret)
603 goto out_clk_disable;
604
605 /* register and we are done */
606 ret = devm_spi_register_controller(dev, host);
607 if (ret) {
608 dev_err(dev, "spi register failed\n");
609 goto out_clk_disable;
610 }
611
612 dev_info(dev, "at %pr (irq %d, FIFOs size %d)\n",
613 r, irq, bs->fifo_size);
614
615 return 0;
616
617 out_clk_disable:
618 clk_disable_unprepare(clk);
619 out_err:
620 spi_controller_put(host);
621 return ret;
622 }
623
bcm63xx_spi_remove(struct platform_device * pdev)624 static void bcm63xx_spi_remove(struct platform_device *pdev)
625 {
626 struct spi_controller *host = platform_get_drvdata(pdev);
627 struct bcm63xx_spi *bs = spi_controller_get_devdata(host);
628
629 /* reset spi block */
630 bcm_spi_writeb(bs, 0, SPI_INT_MASK);
631
632 /* HW shutdown */
633 clk_disable_unprepare(bs->clk);
634 }
635
bcm63xx_spi_suspend(struct device * dev)636 static int bcm63xx_spi_suspend(struct device *dev)
637 {
638 struct spi_controller *host = dev_get_drvdata(dev);
639 struct bcm63xx_spi *bs = spi_controller_get_devdata(host);
640
641 spi_controller_suspend(host);
642
643 clk_disable_unprepare(bs->clk);
644
645 return 0;
646 }
647
bcm63xx_spi_resume(struct device * dev)648 static int bcm63xx_spi_resume(struct device *dev)
649 {
650 struct spi_controller *host = dev_get_drvdata(dev);
651 struct bcm63xx_spi *bs = spi_controller_get_devdata(host);
652 int ret;
653
654 ret = clk_prepare_enable(bs->clk);
655 if (ret)
656 return ret;
657
658 spi_controller_resume(host);
659
660 return 0;
661 }
662
663 static DEFINE_SIMPLE_DEV_PM_OPS(bcm63xx_spi_pm_ops, bcm63xx_spi_suspend, bcm63xx_spi_resume);
664
665 static struct platform_driver bcm63xx_spi_driver = {
666 .driver = {
667 .name = "bcm63xx-spi",
668 .pm = &bcm63xx_spi_pm_ops,
669 .of_match_table = bcm63xx_spi_of_match,
670 },
671 .id_table = bcm63xx_spi_dev_match,
672 .probe = bcm63xx_spi_probe,
673 .remove = bcm63xx_spi_remove,
674 };
675
676 module_platform_driver(bcm63xx_spi_driver);
677
678 MODULE_ALIAS("platform:bcm63xx_spi");
679 MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
680 MODULE_AUTHOR("Tanguy Bouzeloc <tanguy.bouzeloc@efixo.com>");
681 MODULE_DESCRIPTION("Broadcom BCM63xx SPI Controller driver");
682 MODULE_LICENSE("GPL");
683