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Linux 4.1.16
[linux/fpc-iii.git] / drivers / spi / spi-fsl-espi.c
blob80d245ac846fa366abf8d2b7511a1fb4ac25c03e
1 /*
2 * Freescale eSPI controller driver.
3 *
4 * Copyright 2010 Freescale Semiconductor, Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version.
10 */
11 #include <linux/delay.h>
12 #include <linux/err.h>
13 #include <linux/fsl_devices.h>
14 #include <linux/interrupt.h>
15 #include <linux/irq.h>
16 #include <linux/module.h>
17 #include <linux/mm.h>
18 #include <linux/of.h>
19 #include <linux/of_address.h>
20 #include <linux/of_irq.h>
21 #include <linux/of_platform.h>
22 #include <linux/platform_device.h>
23 #include <linux/spi/spi.h>
24 #include <sysdev/fsl_soc.h>
25
26 #include "spi-fsl-lib.h"
27
28 /* eSPI Controller registers */
29 struct fsl_espi_reg {
30 __be32 mode; /* 0x000 - eSPI mode register */
31 __be32 event; /* 0x004 - eSPI event register */
32 __be32 mask; /* 0x008 - eSPI mask register */
33 __be32 command; /* 0x00c - eSPI command register */
34 __be32 transmit; /* 0x010 - eSPI transmit FIFO access register*/
35 __be32 receive; /* 0x014 - eSPI receive FIFO access register*/
36 u8 res[8]; /* 0x018 - 0x01c reserved */
37 __be32 csmode[4]; /* 0x020 - 0x02c eSPI cs mode register */
38 };
39
40 struct fsl_espi_transfer {
41 const void *tx_buf;
42 void *rx_buf;
43 unsigned len;
44 unsigned n_tx;
45 unsigned n_rx;
46 unsigned actual_length;
47 int status;
48 };
49
50 /* eSPI Controller mode register definitions */
51 #define SPMODE_ENABLE (1 << 31)
52 #define SPMODE_LOOP (1 << 30)
53 #define SPMODE_TXTHR(x) ((x) << 8)
54 #define SPMODE_RXTHR(x) ((x) << 0)
55
56 /* eSPI Controller CS mode register definitions */
57 #define CSMODE_CI_INACTIVEHIGH (1 << 31)
58 #define CSMODE_CP_BEGIN_EDGECLK (1 << 30)
59 #define CSMODE_REV (1 << 29)
60 #define CSMODE_DIV16 (1 << 28)
61 #define CSMODE_PM(x) ((x) << 24)
62 #define CSMODE_POL_1 (1 << 20)
63 #define CSMODE_LEN(x) ((x) << 16)
64 #define CSMODE_BEF(x) ((x) << 12)
65 #define CSMODE_AFT(x) ((x) << 8)
66 #define CSMODE_CG(x) ((x) << 3)
67
68 /* Default mode/csmode for eSPI controller */
69 #define SPMODE_INIT_VAL (SPMODE_TXTHR(4) | SPMODE_RXTHR(3))
70 #define CSMODE_INIT_VAL (CSMODE_POL_1 | CSMODE_BEF(0) \
71 | CSMODE_AFT(0) | CSMODE_CG(1))
72
73 /* SPIE register values */
74 #define SPIE_NE 0x00000200 /* Not empty */
75 #define SPIE_NF 0x00000100 /* Not full */
76
77 /* SPIM register values */
78 #define SPIM_NE 0x00000200 /* Not empty */
79 #define SPIM_NF 0x00000100 /* Not full */
80 #define SPIE_RXCNT(reg) ((reg >> 24) & 0x3F)
81 #define SPIE_TXCNT(reg) ((reg >> 16) & 0x3F)
82
83 /* SPCOM register values */
84 #define SPCOM_CS(x) ((x) << 30)
85 #define SPCOM_TRANLEN(x) ((x) << 0)
86 #define SPCOM_TRANLEN_MAX 0xFFFF /* Max transaction length */
87
88 static void fsl_espi_change_mode(struct spi_device *spi)
89 {
90 struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
91 struct spi_mpc8xxx_cs *cs = spi->controller_state;
92 struct fsl_espi_reg *reg_base = mspi->reg_base;
93 __be32 __iomem *mode = &reg_base->csmode[spi->chip_select];
94 __be32 __iomem *espi_mode = &reg_base->mode;
95 u32 tmp;
96 unsigned long flags;
97
98 /* Turn off IRQs locally to minimize time that SPI is disabled. */
99 local_irq_save(flags);
100
101 /* Turn off SPI unit prior changing mode */
102 tmp = mpc8xxx_spi_read_reg(espi_mode);
103 mpc8xxx_spi_write_reg(espi_mode, tmp & ~SPMODE_ENABLE);
104 mpc8xxx_spi_write_reg(mode, cs->hw_mode);
105 mpc8xxx_spi_write_reg(espi_mode, tmp);
106
107 local_irq_restore(flags);
108 }
109
110 static u32 fsl_espi_tx_buf_lsb(struct mpc8xxx_spi *mpc8xxx_spi)
111 {
112 u32 data;
113 u16 data_h;
114 u16 data_l;
115 const u32 *tx = mpc8xxx_spi->tx;
116
117 if (!tx)
118 return 0;
119
120 data = *tx++ << mpc8xxx_spi->tx_shift;
121 data_l = data & 0xffff;
122 data_h = (data >> 16) & 0xffff;
123 swab16s(&data_l);
124 swab16s(&data_h);
125 data = data_h | data_l;
126
127 mpc8xxx_spi->tx = tx;
128 return data;
129 }
130
131 static int fsl_espi_setup_transfer(struct spi_device *spi,
132 struct spi_transfer *t)
133 {
134 struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master);
135 int bits_per_word = 0;
136 u8 pm;
137 u32 hz = 0;
138 struct spi_mpc8xxx_cs *cs = spi->controller_state;
139
140 if (t) {
141 bits_per_word = t->bits_per_word;
142 hz = t->speed_hz;
143 }
144
145 /* spi_transfer level calls that work per-word */
146 if (!bits_per_word)
147 bits_per_word = spi->bits_per_word;
148
149 if (!hz)
150 hz = spi->max_speed_hz;
151
152 cs->rx_shift = 0;
153 cs->tx_shift = 0;
154 cs->get_rx = mpc8xxx_spi_rx_buf_u32;
155 cs->get_tx = mpc8xxx_spi_tx_buf_u32;
156 if (bits_per_word <= 8) {
157 cs->rx_shift = 8 - bits_per_word;
158 } else {
159 cs->rx_shift = 16 - bits_per_word;
160 if (spi->mode & SPI_LSB_FIRST)
161 cs->get_tx = fsl_espi_tx_buf_lsb;
162 }
163
164 mpc8xxx_spi->rx_shift = cs->rx_shift;
165 mpc8xxx_spi->tx_shift = cs->tx_shift;
166 mpc8xxx_spi->get_rx = cs->get_rx;
167 mpc8xxx_spi->get_tx = cs->get_tx;
168
169 bits_per_word = bits_per_word - 1;
170
171 /* mask out bits we are going to set */
172 cs->hw_mode &= ~(CSMODE_LEN(0xF) | CSMODE_DIV16 | CSMODE_PM(0xF));
173
174 cs->hw_mode |= CSMODE_LEN(bits_per_word);
175
176 if ((mpc8xxx_spi->spibrg / hz) > 64) {
177 cs->hw_mode |= CSMODE_DIV16;
178 pm = DIV_ROUND_UP(mpc8xxx_spi->spibrg, hz * 16 * 4);
179
180 WARN_ONCE(pm > 33, "%s: Requested speed is too low: %d Hz. "
181 "Will use %d Hz instead.\n", dev_name(&spi->dev),
182 hz, mpc8xxx_spi->spibrg / (4 * 16 * (32 + 1)));
183 if (pm > 33)
184 pm = 33;
185 } else {
186 pm = DIV_ROUND_UP(mpc8xxx_spi->spibrg, hz * 4);
187 }
188 if (pm)
189 pm--;
190 if (pm < 2)
191 pm = 2;
192
193 cs->hw_mode |= CSMODE_PM(pm);
194
195 fsl_espi_change_mode(spi);
196 return 0;
197 }
198
199 static int fsl_espi_cpu_bufs(struct mpc8xxx_spi *mspi, struct spi_transfer *t,
200 unsigned int len)
201 {
202 u32 word;
203 struct fsl_espi_reg *reg_base = mspi->reg_base;
204
205 mspi->count = len;
206
207 /* enable rx ints */
208 mpc8xxx_spi_write_reg(&reg_base->mask, SPIM_NE);
209
210 /* transmit word */
211 word = mspi->get_tx(mspi);
212 mpc8xxx_spi_write_reg(&reg_base->transmit, word);
213
214 return 0;
215 }
216
217 static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
218 {
219 struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master);
220 struct fsl_espi_reg *reg_base = mpc8xxx_spi->reg_base;
221 unsigned int len = t->len;
222 int ret;
223
224 mpc8xxx_spi->len = t->len;
225 len = roundup(len, 4) / 4;
226
227 mpc8xxx_spi->tx = t->tx_buf;
228 mpc8xxx_spi->rx = t->rx_buf;
229
230 reinit_completion(&mpc8xxx_spi->done);
231
232 /* Set SPCOM[CS] and SPCOM[TRANLEN] field */
233 if ((t->len - 1) > SPCOM_TRANLEN_MAX) {
234 dev_err(mpc8xxx_spi->dev, "Transaction length (%d)"
235 " beyond the SPCOM[TRANLEN] field\n", t->len);
236 return -EINVAL;
237 }
238 mpc8xxx_spi_write_reg(&reg_base->command,
239 (SPCOM_CS(spi->chip_select) | SPCOM_TRANLEN(t->len - 1)));
240
241 ret = fsl_espi_cpu_bufs(mpc8xxx_spi, t, len);
242 if (ret)
243 return ret;
244
245 wait_for_completion(&mpc8xxx_spi->done);
246
247 /* disable rx ints */
248 mpc8xxx_spi_write_reg(&reg_base->mask, 0);
249
250 return mpc8xxx_spi->count;
251 }
252
253 static inline void fsl_espi_addr2cmd(unsigned int addr, u8 *cmd)
254 {
255 if (cmd) {
256 cmd[1] = (u8)(addr >> 16);
257 cmd[2] = (u8)(addr >> 8);
258 cmd[3] = (u8)(addr >> 0);
259 }
260 }
261
262 static inline unsigned int fsl_espi_cmd2addr(u8 *cmd)
263 {
264 if (cmd)
265 return cmd[1] << 16 | cmd[2] << 8 | cmd[3] << 0;
266
267 return 0;
268 }
269
270 static void fsl_espi_do_trans(struct spi_message *m,
271 struct fsl_espi_transfer *tr)
272 {
273 struct spi_device *spi = m->spi;
274 struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
275 struct fsl_espi_transfer *espi_trans = tr;
276 struct spi_message message;
277 struct spi_transfer *t, *first, trans;
278 int status = 0;
279
280 spi_message_init(&message);
281 memset(&trans, 0, sizeof(trans));
282
283 first = list_first_entry(&m->transfers, struct spi_transfer,
284 transfer_list);
285 list_for_each_entry(t, &m->transfers, transfer_list) {
286 if ((first->bits_per_word != t->bits_per_word) ||
287 (first->speed_hz != t->speed_hz)) {
288 espi_trans->status = -EINVAL;
289 dev_err(mspi->dev,
290 "bits_per_word/speed_hz should be same for the same SPI transfer\n");
291 return;
292 }
293
294 trans.speed_hz = t->speed_hz;
295 trans.bits_per_word = t->bits_per_word;
296 trans.delay_usecs = max(first->delay_usecs, t->delay_usecs);
297 }
298
299 trans.len = espi_trans->len;
300 trans.tx_buf = espi_trans->tx_buf;
301 trans.rx_buf = espi_trans->rx_buf;
302 spi_message_add_tail(&trans, &message);
303
304 list_for_each_entry(t, &message.transfers, transfer_list) {
305 if (t->bits_per_word || t->speed_hz) {
306 status = -EINVAL;
307
308 status = fsl_espi_setup_transfer(spi, t);
309 if (status < 0)
310 break;
311 }
312
313 if (t->len)
314 status = fsl_espi_bufs(spi, t);
315
316 if (status) {
317 status = -EMSGSIZE;
318 break;
319 }
320
321 if (t->delay_usecs)
322 udelay(t->delay_usecs);
323 }
324
325 espi_trans->status = status;
326 fsl_espi_setup_transfer(spi, NULL);
327 }
328
329 static void fsl_espi_cmd_trans(struct spi_message *m,
330 struct fsl_espi_transfer *trans, u8 *rx_buff)
331 {
332 struct spi_transfer *t;
333 u8 *local_buf;
334 int i = 0;
335 struct fsl_espi_transfer *espi_trans = trans;
336
337 local_buf = kzalloc(SPCOM_TRANLEN_MAX, GFP_KERNEL);
338 if (!local_buf) {
339 espi_trans->status = -ENOMEM;
340 return;
341 }
342
343 list_for_each_entry(t, &m->transfers, transfer_list) {
344 if (t->tx_buf) {
345 memcpy(local_buf + i, t->tx_buf, t->len);
346 i += t->len;
347 }
348 }
349
350 espi_trans->tx_buf = local_buf;
351 espi_trans->rx_buf = local_buf;
352 fsl_espi_do_trans(m, espi_trans);
353
354 espi_trans->actual_length = espi_trans->len;
355 kfree(local_buf);
356 }
357
358 static void fsl_espi_rw_trans(struct spi_message *m,
359 struct fsl_espi_transfer *trans, u8 *rx_buff)
360 {
361 struct fsl_espi_transfer *espi_trans = trans;
362 unsigned int total_len = espi_trans->len;
363 struct spi_transfer *t;
364 u8 *local_buf;
365 u8 *rx_buf = rx_buff;
366 unsigned int trans_len;
367 unsigned int addr;
368 unsigned int tx_only;
369 unsigned int rx_pos = 0;
370 unsigned int pos;
371 int i, loop;
372
373 local_buf = kzalloc(SPCOM_TRANLEN_MAX, GFP_KERNEL);
374 if (!local_buf) {
375 espi_trans->status = -ENOMEM;
376 return;
377 }
378
379 for (pos = 0, loop = 0; pos < total_len; pos += trans_len, loop++) {
380 trans_len = total_len - pos;
381
382 i = 0;
383 tx_only = 0;
384 list_for_each_entry(t, &m->transfers, transfer_list) {
385 if (t->tx_buf) {
386 memcpy(local_buf + i, t->tx_buf, t->len);
387 i += t->len;
388 if (!t->rx_buf)
389 tx_only += t->len;
390 }
391 }
392
393 /* Add additional TX bytes to compensate SPCOM_TRANLEN_MAX */
394 if (loop > 0)
395 trans_len += tx_only;
396
397 if (trans_len > SPCOM_TRANLEN_MAX)
398 trans_len = SPCOM_TRANLEN_MAX;
399
400 /* Update device offset */
401 if (pos > 0) {
402 addr = fsl_espi_cmd2addr(local_buf);
403 addr += rx_pos;
404 fsl_espi_addr2cmd(addr, local_buf);
405 }
406
407 espi_trans->len = trans_len;
408 espi_trans->tx_buf = local_buf;
409 espi_trans->rx_buf = local_buf;
410 fsl_espi_do_trans(m, espi_trans);
411
412 /* If there is at least one RX byte then copy it to rx_buf */
413 if (tx_only < SPCOM_TRANLEN_MAX)
414 memcpy(rx_buf + rx_pos, espi_trans->rx_buf + tx_only,
415 trans_len - tx_only);
416
417 rx_pos += trans_len - tx_only;
418
419 if (loop > 0)
420 espi_trans->actual_length += espi_trans->len - tx_only;
421 else
422 espi_trans->actual_length += espi_trans->len;
423 }
424
425 kfree(local_buf);
426 }
427
428 static int fsl_espi_do_one_msg(struct spi_master *master,
429 struct spi_message *m)
430 {
431 struct spi_transfer *t;
432 u8 *rx_buf = NULL;
433 unsigned int n_tx = 0;
434 unsigned int n_rx = 0;
435 unsigned int xfer_len = 0;
436 struct fsl_espi_transfer espi_trans;
437
438 list_for_each_entry(t, &m->transfers, transfer_list) {
439 if (t->tx_buf)
440 n_tx += t->len;
441 if (t->rx_buf) {
442 n_rx += t->len;
443 rx_buf = t->rx_buf;
444 }
445 if ((t->tx_buf) || (t->rx_buf))
446 xfer_len += t->len;
447 }
448
449 espi_trans.n_tx = n_tx;
450 espi_trans.n_rx = n_rx;
451 espi_trans.len = xfer_len;
452 espi_trans.actual_length = 0;
453 espi_trans.status = 0;
454
455 if (!rx_buf)
456 fsl_espi_cmd_trans(m, &espi_trans, NULL);
457 else
458 fsl_espi_rw_trans(m, &espi_trans, rx_buf);
459
460 m->actual_length = espi_trans.actual_length;
461 m->status = espi_trans.status;
462 spi_finalize_current_message(master);
463 return 0;
464 }
465
466 static int fsl_espi_setup(struct spi_device *spi)
467 {
468 struct mpc8xxx_spi *mpc8xxx_spi;
469 struct fsl_espi_reg *reg_base;
470 int retval;
471 u32 hw_mode;
472 u32 loop_mode;
473 struct spi_mpc8xxx_cs *cs = spi_get_ctldata(spi);
474
475 if (!spi->max_speed_hz)
476 return -EINVAL;
477
478 if (!cs) {
479 cs = kzalloc(sizeof(*cs), GFP_KERNEL);
480 if (!cs)
481 return -ENOMEM;
482 spi_set_ctldata(spi, cs);
483 }
484
485 mpc8xxx_spi = spi_master_get_devdata(spi->master);
486 reg_base = mpc8xxx_spi->reg_base;
487
488 hw_mode = cs->hw_mode; /* Save original settings */
489 cs->hw_mode = mpc8xxx_spi_read_reg(
490 &reg_base->csmode[spi->chip_select]);
491 /* mask out bits we are going to set */
492 cs->hw_mode &= ~(CSMODE_CP_BEGIN_EDGECLK | CSMODE_CI_INACTIVEHIGH
493 | CSMODE_REV);
494
495 if (spi->mode & SPI_CPHA)
496 cs->hw_mode |= CSMODE_CP_BEGIN_EDGECLK;
497 if (spi->mode & SPI_CPOL)
498 cs->hw_mode |= CSMODE_CI_INACTIVEHIGH;
499 if (!(spi->mode & SPI_LSB_FIRST))
500 cs->hw_mode |= CSMODE_REV;
501
502 /* Handle the loop mode */
503 loop_mode = mpc8xxx_spi_read_reg(&reg_base->mode);
504 loop_mode &= ~SPMODE_LOOP;
505 if (spi->mode & SPI_LOOP)
506 loop_mode |= SPMODE_LOOP;
507 mpc8xxx_spi_write_reg(&reg_base->mode, loop_mode);
508
509 retval = fsl_espi_setup_transfer(spi, NULL);
510 if (retval < 0) {
511 cs->hw_mode = hw_mode; /* Restore settings */
512 return retval;
513 }
514 return 0;
515 }
516
517 static void fsl_espi_cleanup(struct spi_device *spi)
518 {
519 struct spi_mpc8xxx_cs *cs = spi_get_ctldata(spi);
520
521 kfree(cs);
522 spi_set_ctldata(spi, NULL);
523 }
524
525 void fsl_espi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events)
526 {
527 struct fsl_espi_reg *reg_base = mspi->reg_base;
528
529 /* We need handle RX first */
530 if (events & SPIE_NE) {
531 u32 rx_data, tmp;
532 u8 rx_data_8;
533
534 /* Spin until RX is done */
535 while (SPIE_RXCNT(events) < min(4, mspi->len)) {
536 cpu_relax();
537 events = mpc8xxx_spi_read_reg(&reg_base->event);
538 }
539
540 if (mspi->len >= 4) {
541 rx_data = mpc8xxx_spi_read_reg(&reg_base->receive);
542 } else {
543 tmp = mspi->len;
544 rx_data = 0;
545 while (tmp--) {
546 rx_data_8 = in_8((u8 *)&reg_base->receive);
547 rx_data |= (rx_data_8 << (tmp * 8));
548 }
549
550 rx_data <<= (4 - mspi->len) * 8;
551 }
552
553 mspi->len -= 4;
554
555 if (mspi->rx)
556 mspi->get_rx(rx_data, mspi);
557 }
558
559 if (!(events & SPIE_NF)) {
560 int ret;
561
562 /* spin until TX is done */
563 ret = spin_event_timeout(((events = mpc8xxx_spi_read_reg(
564 &reg_base->event)) & SPIE_NF) == 0, 1000, 0);
565 if (!ret) {
566 dev_err(mspi->dev, "tired waiting for SPIE_NF\n");
567 return;
568 }
569 }
570
571 /* Clear the events */
572 mpc8xxx_spi_write_reg(&reg_base->event, events);
573
574 mspi->count -= 1;
575 if (mspi->count) {
576 u32 word = mspi->get_tx(mspi);
577
578 mpc8xxx_spi_write_reg(&reg_base->transmit, word);
579 } else {
580 complete(&mspi->done);
581 }
582 }
583
584 static irqreturn_t fsl_espi_irq(s32 irq, void *context_data)
585 {
586 struct mpc8xxx_spi *mspi = context_data;
587 struct fsl_espi_reg *reg_base = mspi->reg_base;
588 irqreturn_t ret = IRQ_NONE;
589 u32 events;
590
591 /* Get interrupt events(tx/rx) */
592 events = mpc8xxx_spi_read_reg(&reg_base->event);
593 if (events)
594 ret = IRQ_HANDLED;
595
596 dev_vdbg(mspi->dev, "%s: events %x\n", __func__, events);
597
598 fsl_espi_cpu_irq(mspi, events);
599
600 return ret;
601 }
602
603 static void fsl_espi_remove(struct mpc8xxx_spi *mspi)
604 {
605 iounmap(mspi->reg_base);
606 }
607
608 static int fsl_espi_suspend(struct spi_master *master)
609 {
610 struct mpc8xxx_spi *mpc8xxx_spi;
611 struct fsl_espi_reg *reg_base;
612 u32 regval;
613
614 mpc8xxx_spi = spi_master_get_devdata(master);
615 reg_base = mpc8xxx_spi->reg_base;
616
617 regval = mpc8xxx_spi_read_reg(&reg_base->mode);
618 regval &= ~SPMODE_ENABLE;
619 mpc8xxx_spi_write_reg(&reg_base->mode, regval);
620
621 return 0;
622 }
623
624 static int fsl_espi_resume(struct spi_master *master)
625 {
626 struct mpc8xxx_spi *mpc8xxx_spi;
627 struct fsl_espi_reg *reg_base;
628 u32 regval;
629
630 mpc8xxx_spi = spi_master_get_devdata(master);
631 reg_base = mpc8xxx_spi->reg_base;
632
633 regval = mpc8xxx_spi_read_reg(&reg_base->mode);
634 regval |= SPMODE_ENABLE;
635 mpc8xxx_spi_write_reg(&reg_base->mode, regval);
636
637 return 0;
638 }
639
640 static struct spi_master * fsl_espi_probe(struct device *dev,
641 struct resource *mem, unsigned int irq)
642 {
643 struct fsl_spi_platform_data *pdata = dev_get_platdata(dev);
644 struct spi_master *master;
645 struct mpc8xxx_spi *mpc8xxx_spi;
646 struct fsl_espi_reg *reg_base;
647 struct device_node *nc;
648 const __be32 *prop;
649 u32 regval, csmode;
650 int i, len, ret = 0;
651
652 master = spi_alloc_master(dev, sizeof(struct mpc8xxx_spi));
653 if (!master) {
654 ret = -ENOMEM;
655 goto err;
656 }
657
658 dev_set_drvdata(dev, master);
659
660 mpc8xxx_spi_probe(dev, mem, irq);
661
662 master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 16);
663 master->setup = fsl_espi_setup;
664 master->cleanup = fsl_espi_cleanup;
665 master->transfer_one_message = fsl_espi_do_one_msg;
666 master->prepare_transfer_hardware = fsl_espi_resume;
667 master->unprepare_transfer_hardware = fsl_espi_suspend;
668
669 mpc8xxx_spi = spi_master_get_devdata(master);
670 mpc8xxx_spi->spi_remove = fsl_espi_remove;
671
672 mpc8xxx_spi->reg_base = ioremap(mem->start, resource_size(mem));
673 if (!mpc8xxx_spi->reg_base) {
674 ret = -ENOMEM;
675 goto err_probe;
676 }
677
678 reg_base = mpc8xxx_spi->reg_base;
679
680 /* Register for SPI Interrupt */
681 ret = request_irq(mpc8xxx_spi->irq, fsl_espi_irq,
682 0, "fsl_espi", mpc8xxx_spi);
683 if (ret)
684 goto free_irq;
685
686 if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) {
687 mpc8xxx_spi->rx_shift = 16;
688 mpc8xxx_spi->tx_shift = 24;
689 }
690
691 /* SPI controller initializations */
692 mpc8xxx_spi_write_reg(&reg_base->mode, 0);
693 mpc8xxx_spi_write_reg(&reg_base->mask, 0);
694 mpc8xxx_spi_write_reg(&reg_base->command, 0);
695 mpc8xxx_spi_write_reg(&reg_base->event, 0xffffffff);
696
697 /* Init eSPI CS mode register */
698 for_each_available_child_of_node(master->dev.of_node, nc) {
699 /* get chip select */
700 prop = of_get_property(nc, "reg", &len);
701 if (!prop || len < sizeof(*prop))
702 continue;
703 i = be32_to_cpup(prop);
704 if (i < 0 || i >= pdata->max_chipselect)
705 continue;
706
707 csmode = CSMODE_INIT_VAL;
708 /* check if CSBEF is set in device tree */
709 prop = of_get_property(nc, "fsl,csbef", &len);
710 if (prop && len >= sizeof(*prop)) {
711 csmode &= ~(CSMODE_BEF(0xf));
712 csmode |= CSMODE_BEF(be32_to_cpup(prop));
713 }
714 /* check if CSAFT is set in device tree */
715 prop = of_get_property(nc, "fsl,csaft", &len);
716 if (prop && len >= sizeof(*prop)) {
717 csmode &= ~(CSMODE_AFT(0xf));
718 csmode |= CSMODE_AFT(be32_to_cpup(prop));
719 }
720 mpc8xxx_spi_write_reg(&reg_base->csmode[i], csmode);
721
722 dev_info(dev, "cs=%d, init_csmode=0x%x\n", i, csmode);
723 }
724
725 /* Enable SPI interface */
726 regval = pdata->initial_spmode | SPMODE_INIT_VAL | SPMODE_ENABLE;
727
728 mpc8xxx_spi_write_reg(&reg_base->mode, regval);
729
730 ret = spi_register_master(master);
731 if (ret < 0)
732 goto unreg_master;
733
734 dev_info(dev, "at 0x%p (irq = %d)\n", reg_base, mpc8xxx_spi->irq);
735
736 return master;
737
738 unreg_master:
739 free_irq(mpc8xxx_spi->irq, mpc8xxx_spi);
740 free_irq:
741 iounmap(mpc8xxx_spi->reg_base);
742 err_probe:
743 spi_master_put(master);
744 err:
745 return ERR_PTR(ret);
746 }
747
748 static int of_fsl_espi_get_chipselects(struct device *dev)
749 {
750 struct device_node *np = dev->of_node;
751 struct fsl_spi_platform_data *pdata = dev_get_platdata(dev);
752 const u32 *prop;
753 int len;
754
755 prop = of_get_property(np, "fsl,espi-num-chipselects", &len);
756 if (!prop || len < sizeof(*prop)) {
757 dev_err(dev, "No 'fsl,espi-num-chipselects' property\n");
758 return -EINVAL;
759 }
760
761 pdata->max_chipselect = *prop;
762 pdata->cs_control = NULL;
763
764 return 0;
765 }
766
767 static int of_fsl_espi_probe(struct platform_device *ofdev)
768 {
769 struct device *dev = &ofdev->dev;
770 struct device_node *np = ofdev->dev.of_node;
771 struct spi_master *master;
772 struct resource mem;
773 unsigned int irq;
774 int ret = -ENOMEM;
775
776 ret = of_mpc8xxx_spi_probe(ofdev);
777 if (ret)
778 return ret;
779
780 ret = of_fsl_espi_get_chipselects(dev);
781 if (ret)
782 goto err;
783
784 ret = of_address_to_resource(np, 0, &mem);
785 if (ret)
786 goto err;
787
788 irq = irq_of_parse_and_map(np, 0);
789 if (!irq) {
790 ret = -EINVAL;
791 goto err;
792 }
793
794 master = fsl_espi_probe(dev, &mem, irq);
795 if (IS_ERR(master)) {
796 ret = PTR_ERR(master);
797 goto err;
798 }
799
800 return 0;
801
802 err:
803 return ret;
804 }
805
806 static int of_fsl_espi_remove(struct platform_device *dev)
807 {
808 return mpc8xxx_spi_remove(&dev->dev);
809 }
810
811 #ifdef CONFIG_PM_SLEEP
812 static int of_fsl_espi_suspend(struct device *dev)
813 {
814 struct spi_master *master = dev_get_drvdata(dev);
815 int ret;
816
817 ret = spi_master_suspend(master);
818 if (ret) {
819 dev_warn(dev, "cannot suspend master\n");
820 return ret;
821 }
822
823 return fsl_espi_suspend(master);
824 }
825
826 static int of_fsl_espi_resume(struct device *dev)
827 {
828 struct fsl_spi_platform_data *pdata = dev_get_platdata(dev);
829 struct spi_master *master = dev_get_drvdata(dev);
830 struct mpc8xxx_spi *mpc8xxx_spi;
831 struct fsl_espi_reg *reg_base;
832 u32 regval;
833 int i;
834
835 mpc8xxx_spi = spi_master_get_devdata(master);
836 reg_base = mpc8xxx_spi->reg_base;
837
838 /* SPI controller initializations */
839 mpc8xxx_spi_write_reg(&reg_base->mode, 0);
840 mpc8xxx_spi_write_reg(&reg_base->mask, 0);
841 mpc8xxx_spi_write_reg(&reg_base->command, 0);
842 mpc8xxx_spi_write_reg(&reg_base->event, 0xffffffff);
843
844 /* Init eSPI CS mode register */
845 for (i = 0; i < pdata->max_chipselect; i++)
846 mpc8xxx_spi_write_reg(&reg_base->csmode[i], CSMODE_INIT_VAL);
847
848 /* Enable SPI interface */
849 regval = pdata->initial_spmode | SPMODE_INIT_VAL | SPMODE_ENABLE;
850
851 mpc8xxx_spi_write_reg(&reg_base->mode, regval);
852
853 return spi_master_resume(master);
854 }
855 #endif /* CONFIG_PM_SLEEP */
856
857 static const struct dev_pm_ops espi_pm = {
858 SET_SYSTEM_SLEEP_PM_OPS(of_fsl_espi_suspend, of_fsl_espi_resume)
859 };
860
861 static const struct of_device_id of_fsl_espi_match[] = {
862 { .compatible = "fsl,mpc8536-espi" },
863 {}
864 };
865 MODULE_DEVICE_TABLE(of, of_fsl_espi_match);
866
867 static struct platform_driver fsl_espi_driver = {
868 .driver = {
869 .name = "fsl_espi",
870 .of_match_table = of_fsl_espi_match,
871 .pm = &espi_pm,
872 },
873 .probe = of_fsl_espi_probe,
874 .remove = of_fsl_espi_remove,
875 };
876 module_platform_driver(fsl_espi_driver);
877
878 MODULE_AUTHOR("Mingkai Hu");
879 MODULE_DESCRIPTION("Enhanced Freescale SPI Driver");
880 MODULE_LICENSE("GPL");
Linux with added FPC-III support