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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Freescale SPI controller driver.
4 *
5 * Maintainer: Kumar Gala
6 *
7 * Copyright (C) 2006 Polycom, Inc.
8 * Copyright 2010 Freescale Semiconductor, Inc.
9 *
10 * CPM SPI and QE buffer descriptors mode support:
11 * Copyright (c) 2009 MontaVista Software, Inc.
12 * Author: Anton Vorontsov <avorontsov@ru.mvista.com>
13 *
14 * GRLIB support:
15 * Copyright (c) 2012 Aeroflex Gaisler AB.
16 * Author: Andreas Larsson <andreas@gaisler.com>
17 */
18#include <linux/delay.h>
19#include <linux/dma-mapping.h>
20#include <linux/fsl_devices.h>
21#include <linux/gpio/consumer.h>
22#include <linux/interrupt.h>
23#include <linux/irq.h>
24#include <linux/kernel.h>
25#include <linux/mm.h>
26#include <linux/module.h>
27#include <linux/mutex.h>
28#include <linux/of.h>
29#include <linux/of_address.h>
30#include <linux/of_irq.h>
31#include <linux/of_platform.h>
32#include <linux/platform_device.h>
33#include <linux/spi/spi.h>
34#include <linux/spi/spi_bitbang.h>
35#include <linux/types.h>
36
37#ifdef CONFIG_FSL_SOC
38#include <sysdev/fsl_soc.h>
39#endif
40
41/* Specific to the MPC8306/MPC8309 */
42#define IMMR_SPI_CS_OFFSET 0x14c
43#define SPI_BOOT_SEL_BIT 0x80000000
44
45#include "spi-fsl-lib.h"
46#include "spi-fsl-cpm.h"
47#include "spi-fsl-spi.h"
48
49#define TYPE_FSL 0
50#define TYPE_GRLIB 1
51
52struct fsl_spi_match_data {
53 int type;
54};
55
56static struct fsl_spi_match_data of_fsl_spi_fsl_config = {
57 .type = TYPE_FSL,
58};
59
60static struct fsl_spi_match_data of_fsl_spi_grlib_config = {
61 .type = TYPE_GRLIB,
62};
63
64static const struct of_device_id of_fsl_spi_match[] = {
65 {
66 .compatible = "fsl,spi",
67 .data = &of_fsl_spi_fsl_config,
68 },
69 {
70 .compatible = "aeroflexgaisler,spictrl",
71 .data = &of_fsl_spi_grlib_config,
72 },
73 {}
74};
75MODULE_DEVICE_TABLE(of, of_fsl_spi_match);
76
77static int fsl_spi_get_type(struct device *dev)
78{
79 const struct of_device_id *match;
80
81 if (dev->of_node) {
82 match = of_match_node(of_fsl_spi_match, dev->of_node);
83 if (match && match->data)
84 return ((struct fsl_spi_match_data *)match->data)->type;
85 }
86 return TYPE_FSL;
87}
88
89static void fsl_spi_change_mode(struct spi_device *spi)
90{
91 struct mpc8xxx_spi *mspi = spi_controller_get_devdata(spi->controller);
92 struct spi_mpc8xxx_cs *cs = spi->controller_state;
93 struct fsl_spi_reg __iomem *reg_base = mspi->reg_base;
94 __be32 __iomem *mode = ®_base->mode;
95 unsigned long flags;
96
97 if (cs->hw_mode == mpc8xxx_spi_read_reg(mode))
98 return;
99
100 /* Turn off IRQs locally to minimize time that SPI is disabled. */
101 local_irq_save(flags);
102
103 /* Turn off SPI unit prior changing mode */
104 mpc8xxx_spi_write_reg(mode, cs->hw_mode & ~SPMODE_ENABLE);
105
106 /* When in CPM mode, we need to reinit tx and rx. */
107 if (mspi->flags & SPI_CPM_MODE) {
108 fsl_spi_cpm_reinit_txrx(mspi);
109 }
110 mpc8xxx_spi_write_reg(mode, cs->hw_mode);
111 local_irq_restore(flags);
112}
113
114static void fsl_spi_qe_cpu_set_shifts(u32 *rx_shift, u32 *tx_shift,
115 int bits_per_word, int msb_first)
116{
117 *rx_shift = 0;
118 *tx_shift = 0;
119 if (msb_first) {
120 if (bits_per_word <= 8) {
121 *rx_shift = 16;
122 *tx_shift = 24;
123 } else if (bits_per_word <= 16) {
124 *rx_shift = 16;
125 *tx_shift = 16;
126 }
127 } else {
128 if (bits_per_word <= 8)
129 *rx_shift = 8;
130 }
131}
132
133static void fsl_spi_grlib_set_shifts(u32 *rx_shift, u32 *tx_shift,
134 int bits_per_word, int msb_first)
135{
136 *rx_shift = 0;
137 *tx_shift = 0;
138 if (bits_per_word <= 16) {
139 if (msb_first) {
140 *rx_shift = 16; /* LSB in bit 16 */
141 *tx_shift = 32 - bits_per_word; /* MSB in bit 31 */
142 } else {
143 *rx_shift = 16 - bits_per_word; /* MSB in bit 15 */
144 }
145 }
146}
147
148static void mspi_apply_cpu_mode_quirks(struct spi_mpc8xxx_cs *cs,
149 struct spi_device *spi,
150 struct mpc8xxx_spi *mpc8xxx_spi,
151 int bits_per_word)
152{
153 cs->rx_shift = 0;
154 cs->tx_shift = 0;
155 if (bits_per_word <= 8) {
156 cs->get_rx = mpc8xxx_spi_rx_buf_u8;
157 cs->get_tx = mpc8xxx_spi_tx_buf_u8;
158 } else if (bits_per_word <= 16) {
159 cs->get_rx = mpc8xxx_spi_rx_buf_u16;
160 cs->get_tx = mpc8xxx_spi_tx_buf_u16;
161 } else if (bits_per_word <= 32) {
162 cs->get_rx = mpc8xxx_spi_rx_buf_u32;
163 cs->get_tx = mpc8xxx_spi_tx_buf_u32;
164 }
165
166 if (mpc8xxx_spi->set_shifts)
167 mpc8xxx_spi->set_shifts(&cs->rx_shift, &cs->tx_shift,
168 bits_per_word,
169 !(spi->mode & SPI_LSB_FIRST));
170
171 mpc8xxx_spi->rx_shift = cs->rx_shift;
172 mpc8xxx_spi->tx_shift = cs->tx_shift;
173 mpc8xxx_spi->get_rx = cs->get_rx;
174 mpc8xxx_spi->get_tx = cs->get_tx;
175}
176
177static int fsl_spi_setup_transfer(struct spi_device *spi,
178 struct spi_transfer *t)
179{
180 struct mpc8xxx_spi *mpc8xxx_spi;
181 int bits_per_word = 0;
182 u8 pm;
183 u32 hz = 0;
184 struct spi_mpc8xxx_cs *cs = spi->controller_state;
185
186 mpc8xxx_spi = spi_controller_get_devdata(spi->controller);
187
188 if (t) {
189 bits_per_word = t->bits_per_word;
190 hz = t->speed_hz;
191 }
192
193 /* spi_transfer level calls that work per-word */
194 if (!bits_per_word)
195 bits_per_word = spi->bits_per_word;
196
197 if (!hz)
198 hz = spi->max_speed_hz;
199
200 if (!(mpc8xxx_spi->flags & SPI_CPM_MODE))
201 mspi_apply_cpu_mode_quirks(cs, spi, mpc8xxx_spi, bits_per_word);
202
203 if (bits_per_word == 32)
204 bits_per_word = 0;
205 else
206 bits_per_word = bits_per_word - 1;
207
208 /* mask out bits we are going to set */
209 cs->hw_mode &= ~(SPMODE_LEN(0xF) | SPMODE_DIV16
210 | SPMODE_PM(0xF));
211
212 cs->hw_mode |= SPMODE_LEN(bits_per_word);
213
214 if ((mpc8xxx_spi->spibrg / hz) > 64) {
215 cs->hw_mode |= SPMODE_DIV16;
216 pm = (mpc8xxx_spi->spibrg - 1) / (hz * 64) + 1;
217 WARN_ONCE(pm > 16,
218 "%s: Requested speed is too low: %d Hz. Will use %d Hz instead.\n",
219 dev_name(&spi->dev), hz, mpc8xxx_spi->spibrg / 1024);
220 if (pm > 16)
221 pm = 16;
222 } else {
223 pm = (mpc8xxx_spi->spibrg - 1) / (hz * 4) + 1;
224 }
225 if (pm)
226 pm--;
227
228 cs->hw_mode |= SPMODE_PM(pm);
229
230 fsl_spi_change_mode(spi);
231 return 0;
232}
233
234static int fsl_spi_cpu_bufs(struct mpc8xxx_spi *mspi,
235 struct spi_transfer *t, unsigned int len)
236{
237 u32 word;
238 struct fsl_spi_reg __iomem *reg_base = mspi->reg_base;
239
240 mspi->count = len;
241
242 /* enable rx ints */
243 mpc8xxx_spi_write_reg(®_base->mask, SPIM_NE);
244
245 /* transmit word */
246 word = mspi->get_tx(mspi);
247 mpc8xxx_spi_write_reg(®_base->transmit, word);
248
249 return 0;
250}
251
252static int fsl_spi_bufs(struct spi_device *spi, struct spi_transfer *t,
253 bool is_dma_mapped)
254{
255 struct mpc8xxx_spi *mpc8xxx_spi = spi_controller_get_devdata(spi->controller);
256 struct fsl_spi_reg __iomem *reg_base;
257 unsigned int len = t->len;
258 u8 bits_per_word;
259 int ret;
260
261 reg_base = mpc8xxx_spi->reg_base;
262 bits_per_word = spi->bits_per_word;
263 if (t->bits_per_word)
264 bits_per_word = t->bits_per_word;
265
266 if (bits_per_word > 8)
267 len /= 2;
268 if (bits_per_word > 16)
269 len /= 2;
270
271 mpc8xxx_spi->tx = t->tx_buf;
272 mpc8xxx_spi->rx = t->rx_buf;
273
274 reinit_completion(&mpc8xxx_spi->done);
275
276 if (mpc8xxx_spi->flags & SPI_CPM_MODE)
277 ret = fsl_spi_cpm_bufs(mpc8xxx_spi, t, is_dma_mapped);
278 else
279 ret = fsl_spi_cpu_bufs(mpc8xxx_spi, t, len);
280 if (ret)
281 return ret;
282
283 wait_for_completion(&mpc8xxx_spi->done);
284
285 /* disable rx ints */
286 mpc8xxx_spi_write_reg(®_base->mask, 0);
287
288 if (mpc8xxx_spi->flags & SPI_CPM_MODE)
289 fsl_spi_cpm_bufs_complete(mpc8xxx_spi);
290
291 return mpc8xxx_spi->count;
292}
293
294static int fsl_spi_prepare_message(struct spi_controller *ctlr,
295 struct spi_message *m)
296{
297 struct mpc8xxx_spi *mpc8xxx_spi = spi_controller_get_devdata(ctlr);
298 struct spi_transfer *t;
299 struct spi_transfer *first;
300
301 first = list_first_entry(&m->transfers, struct spi_transfer,
302 transfer_list);
303
304 /*
305 * In CPU mode, optimize large byte transfers to use larger
306 * bits_per_word values to reduce number of interrupts taken.
307 *
308 * Some glitches can appear on the SPI clock when the mode changes.
309 * Check that there is no speed change during the transfer and set it up
310 * now to change the mode without having a chip-select asserted.
311 */
312 list_for_each_entry(t, &m->transfers, transfer_list) {
313 if (t->speed_hz != first->speed_hz) {
314 dev_err(&m->spi->dev,
315 "speed_hz cannot change during message.\n");
316 return -EINVAL;
317 }
318 if (!(mpc8xxx_spi->flags & SPI_CPM_MODE)) {
319 if (t->len < 256 || t->bits_per_word != 8)
320 continue;
321 if ((t->len & 3) == 0)
322 t->bits_per_word = 32;
323 else if ((t->len & 1) == 0)
324 t->bits_per_word = 16;
325 } else {
326 /*
327 * CPM/QE uses Little Endian for words > 8
328 * so transform 16 and 32 bits words into 8 bits
329 * Unfortnatly that doesn't work for LSB so
330 * reject these for now
331 * Note: 32 bits word, LSB works iff
332 * tfcr/rfcr is set to CPMFCR_GBL
333 */
334 if (m->spi->mode & SPI_LSB_FIRST && t->bits_per_word > 8)
335 return -EINVAL;
336 if (t->bits_per_word == 16 || t->bits_per_word == 32)
337 t->bits_per_word = 8; /* pretend its 8 bits */
338 if (t->bits_per_word == 8 && t->len >= 256 &&
339 (mpc8xxx_spi->flags & SPI_CPM1))
340 t->bits_per_word = 16;
341 }
342 }
343 return fsl_spi_setup_transfer(m->spi, first);
344}
345
346static int fsl_spi_transfer_one(struct spi_controller *controller,
347 struct spi_device *spi,
348 struct spi_transfer *t)
349{
350 int status;
351
352 status = fsl_spi_setup_transfer(spi, t);
353 if (status < 0)
354 return status;
355 if (t->len)
356 status = fsl_spi_bufs(spi, t, !!t->tx_dma || !!t->rx_dma);
357 if (status > 0)
358 return -EMSGSIZE;
359
360 return status;
361}
362
363static int fsl_spi_unprepare_message(struct spi_controller *controller,
364 struct spi_message *msg)
365{
366 return fsl_spi_setup_transfer(msg->spi, NULL);
367}
368
369static int fsl_spi_setup(struct spi_device *spi)
370{
371 struct mpc8xxx_spi *mpc8xxx_spi;
372 struct fsl_spi_reg __iomem *reg_base;
373 bool initial_setup = false;
374 int retval;
375 u32 hw_mode;
376 struct spi_mpc8xxx_cs *cs = spi_get_ctldata(spi);
377
378 if (!spi->max_speed_hz)
379 return -EINVAL;
380
381 if (!cs) {
382 cs = kzalloc(sizeof(*cs), GFP_KERNEL);
383 if (!cs)
384 return -ENOMEM;
385 spi_set_ctldata(spi, cs);
386 initial_setup = true;
387 }
388 mpc8xxx_spi = spi_controller_get_devdata(spi->controller);
389
390 reg_base = mpc8xxx_spi->reg_base;
391
392 hw_mode = cs->hw_mode; /* Save original settings */
393 cs->hw_mode = mpc8xxx_spi_read_reg(®_base->mode);
394 /* mask out bits we are going to set */
395 cs->hw_mode &= ~(SPMODE_CP_BEGIN_EDGECLK | SPMODE_CI_INACTIVEHIGH
396 | SPMODE_REV | SPMODE_LOOP);
397
398 if (spi->mode & SPI_CPHA)
399 cs->hw_mode |= SPMODE_CP_BEGIN_EDGECLK;
400 if (spi->mode & SPI_CPOL)
401 cs->hw_mode |= SPMODE_CI_INACTIVEHIGH;
402 if (!(spi->mode & SPI_LSB_FIRST))
403 cs->hw_mode |= SPMODE_REV;
404 if (spi->mode & SPI_LOOP)
405 cs->hw_mode |= SPMODE_LOOP;
406
407 retval = fsl_spi_setup_transfer(spi, NULL);
408 if (retval < 0) {
409 cs->hw_mode = hw_mode; /* Restore settings */
410 if (initial_setup)
411 kfree(cs);
412 return retval;
413 }
414
415 return 0;
416}
417
418static void fsl_spi_cleanup(struct spi_device *spi)
419{
420 struct spi_mpc8xxx_cs *cs = spi_get_ctldata(spi);
421
422 kfree(cs);
423 spi_set_ctldata(spi, NULL);
424}
425
426static void fsl_spi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events)
427{
428 struct fsl_spi_reg __iomem *reg_base = mspi->reg_base;
429
430 /* We need handle RX first */
431 if (events & SPIE_NE) {
432 u32 rx_data = mpc8xxx_spi_read_reg(®_base->receive);
433
434 if (mspi->rx)
435 mspi->get_rx(rx_data, mspi);
436 }
437
438 if ((events & SPIE_NF) == 0)
439 /* spin until TX is done */
440 while (((events =
441 mpc8xxx_spi_read_reg(®_base->event)) &
442 SPIE_NF) == 0)
443 cpu_relax();
444
445 /* Clear the events */
446 mpc8xxx_spi_write_reg(®_base->event, events);
447
448 mspi->count -= 1;
449 if (mspi->count) {
450 u32 word = mspi->get_tx(mspi);
451
452 mpc8xxx_spi_write_reg(®_base->transmit, word);
453 } else {
454 complete(&mspi->done);
455 }
456}
457
458static irqreturn_t fsl_spi_irq(s32 irq, void *context_data)
459{
460 struct mpc8xxx_spi *mspi = context_data;
461 irqreturn_t ret = IRQ_NONE;
462 u32 events;
463 struct fsl_spi_reg __iomem *reg_base = mspi->reg_base;
464
465 /* Get interrupt events(tx/rx) */
466 events = mpc8xxx_spi_read_reg(®_base->event);
467 if (events)
468 ret = IRQ_HANDLED;
469
470 dev_dbg(mspi->dev, "%s: events %x\n", __func__, events);
471
472 if (mspi->flags & SPI_CPM_MODE)
473 fsl_spi_cpm_irq(mspi, events);
474 else
475 fsl_spi_cpu_irq(mspi, events);
476
477 return ret;
478}
479
480static void fsl_spi_grlib_cs_control(struct spi_device *spi, bool on)
481{
482 struct mpc8xxx_spi *mpc8xxx_spi = spi_controller_get_devdata(spi->controller);
483 struct fsl_spi_reg __iomem *reg_base = mpc8xxx_spi->reg_base;
484 u32 slvsel;
485 u16 cs = spi_get_chipselect(spi, 0);
486
487 if (cs < mpc8xxx_spi->native_chipselects) {
488 slvsel = mpc8xxx_spi_read_reg(®_base->slvsel);
489 slvsel = on ? (slvsel | (1 << cs)) : (slvsel & ~(1 << cs));
490 mpc8xxx_spi_write_reg(®_base->slvsel, slvsel);
491 }
492}
493
494static void fsl_spi_grlib_probe(struct device *dev)
495{
496 struct spi_controller *host = dev_get_drvdata(dev);
497 struct mpc8xxx_spi *mpc8xxx_spi = spi_controller_get_devdata(host);
498 struct fsl_spi_reg __iomem *reg_base = mpc8xxx_spi->reg_base;
499 int mbits;
500 u32 capabilities;
501
502 capabilities = mpc8xxx_spi_read_reg(®_base->cap);
503
504 mpc8xxx_spi->set_shifts = fsl_spi_grlib_set_shifts;
505 mbits = SPCAP_MAXWLEN(capabilities);
506 if (mbits)
507 mpc8xxx_spi->max_bits_per_word = mbits + 1;
508
509 mpc8xxx_spi->native_chipselects = 0;
510 if (SPCAP_SSEN(capabilities)) {
511 mpc8xxx_spi->native_chipselects = SPCAP_SSSZ(capabilities);
512 mpc8xxx_spi_write_reg(®_base->slvsel, 0xffffffff);
513 }
514 host->num_chipselect = mpc8xxx_spi->native_chipselects;
515 host->set_cs = fsl_spi_grlib_cs_control;
516}
517
518static void fsl_spi_cs_control(struct spi_device *spi, bool on)
519{
520 struct device *dev = spi->dev.parent->parent;
521 struct fsl_spi_platform_data *pdata = dev_get_platdata(dev);
522 struct mpc8xxx_spi_probe_info *pinfo = to_of_pinfo(pdata);
523
524 if (WARN_ON_ONCE(!pinfo->immr_spi_cs))
525 return;
526 iowrite32be(on ? 0 : SPI_BOOT_SEL_BIT, pinfo->immr_spi_cs);
527}
528
529static struct spi_controller *fsl_spi_probe(struct device *dev,
530 struct resource *mem, unsigned int irq)
531{
532 struct fsl_spi_platform_data *pdata = dev_get_platdata(dev);
533 struct spi_controller *host;
534 struct mpc8xxx_spi *mpc8xxx_spi;
535 struct fsl_spi_reg __iomem *reg_base;
536 u32 regval;
537 int ret = 0;
538
539 host = spi_alloc_host(dev, sizeof(struct mpc8xxx_spi));
540 if (host == NULL) {
541 ret = -ENOMEM;
542 goto err;
543 }
544
545 dev_set_drvdata(dev, host);
546
547 mpc8xxx_spi_probe(dev, mem, irq);
548
549 host->setup = fsl_spi_setup;
550 host->cleanup = fsl_spi_cleanup;
551 host->prepare_message = fsl_spi_prepare_message;
552 host->transfer_one = fsl_spi_transfer_one;
553 host->unprepare_message = fsl_spi_unprepare_message;
554 host->use_gpio_descriptors = true;
555 host->set_cs = fsl_spi_cs_control;
556
557 mpc8xxx_spi = spi_controller_get_devdata(host);
558 mpc8xxx_spi->max_bits_per_word = 32;
559 mpc8xxx_spi->type = fsl_spi_get_type(dev);
560
561 ret = fsl_spi_cpm_init(mpc8xxx_spi);
562 if (ret)
563 goto err_cpm_init;
564
565 mpc8xxx_spi->reg_base = devm_ioremap_resource(dev, mem);
566 if (IS_ERR(mpc8xxx_spi->reg_base)) {
567 ret = PTR_ERR(mpc8xxx_spi->reg_base);
568 goto err_probe;
569 }
570
571 if (mpc8xxx_spi->type == TYPE_GRLIB)
572 fsl_spi_grlib_probe(dev);
573
574 if (mpc8xxx_spi->flags & SPI_CPM_MODE)
575 host->bits_per_word_mask =
576 (SPI_BPW_RANGE_MASK(4, 8) | SPI_BPW_MASK(16) | SPI_BPW_MASK(32));
577 else
578 host->bits_per_word_mask =
579 (SPI_BPW_RANGE_MASK(4, 16) | SPI_BPW_MASK(32));
580
581 host->bits_per_word_mask &=
582 SPI_BPW_RANGE_MASK(1, mpc8xxx_spi->max_bits_per_word);
583
584 if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE)
585 mpc8xxx_spi->set_shifts = fsl_spi_qe_cpu_set_shifts;
586
587 if (mpc8xxx_spi->set_shifts)
588 /* 8 bits per word and MSB first */
589 mpc8xxx_spi->set_shifts(&mpc8xxx_spi->rx_shift,
590 &mpc8xxx_spi->tx_shift, 8, 1);
591
592 /* Register for SPI Interrupt */
593 ret = devm_request_irq(dev, mpc8xxx_spi->irq, fsl_spi_irq,
594 0, "fsl_spi", mpc8xxx_spi);
595
596 if (ret != 0)
597 goto err_probe;
598
599 reg_base = mpc8xxx_spi->reg_base;
600
601 /* SPI controller initializations */
602 mpc8xxx_spi_write_reg(®_base->mode, 0);
603 mpc8xxx_spi_write_reg(®_base->mask, 0);
604 mpc8xxx_spi_write_reg(®_base->command, 0);
605 mpc8xxx_spi_write_reg(®_base->event, 0xffffffff);
606
607 /* Enable SPI interface */
608 regval = pdata->initial_spmode | SPMODE_INIT_VAL | SPMODE_ENABLE;
609 if (mpc8xxx_spi->max_bits_per_word < 8) {
610 regval &= ~SPMODE_LEN(0xF);
611 regval |= SPMODE_LEN(mpc8xxx_spi->max_bits_per_word - 1);
612 }
613 if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE)
614 regval |= SPMODE_OP;
615
616 mpc8xxx_spi_write_reg(®_base->mode, regval);
617
618 ret = devm_spi_register_controller(dev, host);
619 if (ret < 0)
620 goto err_probe;
621
622 dev_info(dev, "at 0x%p (irq = %d), %s mode\n", reg_base,
623 mpc8xxx_spi->irq, mpc8xxx_spi_strmode(mpc8xxx_spi->flags));
624
625 return host;
626
627err_probe:
628 fsl_spi_cpm_free(mpc8xxx_spi);
629err_cpm_init:
630 spi_controller_put(host);
631err:
632 return ERR_PTR(ret);
633}
634
635static int of_fsl_spi_probe(struct platform_device *ofdev)
636{
637 struct device *dev = &ofdev->dev;
638 struct device_node *np = ofdev->dev.of_node;
639 struct spi_controller *host;
640 struct resource mem;
641 int irq, type;
642 int ret;
643 bool spisel_boot = false;
644#if IS_ENABLED(CONFIG_FSL_SOC)
645 struct mpc8xxx_spi_probe_info *pinfo = NULL;
646#endif
647
648
649 ret = of_mpc8xxx_spi_probe(ofdev);
650 if (ret)
651 return ret;
652
653 type = fsl_spi_get_type(&ofdev->dev);
654 if (type == TYPE_FSL) {
655 struct fsl_spi_platform_data *pdata = dev_get_platdata(dev);
656#if IS_ENABLED(CONFIG_FSL_SOC)
657 pinfo = to_of_pinfo(pdata);
658
659 spisel_boot = of_property_read_bool(np, "fsl,spisel_boot");
660 if (spisel_boot) {
661 pinfo->immr_spi_cs = ioremap(get_immrbase() + IMMR_SPI_CS_OFFSET, 4);
662 if (!pinfo->immr_spi_cs)
663 return -ENOMEM;
664 }
665#endif
666 /*
667 * Handle the case where we have one hardwired (always selected)
668 * device on the first "chipselect". Else we let the core code
669 * handle any GPIOs or native chip selects and assign the
670 * appropriate callback for dealing with the CS lines. This isn't
671 * supported on the GRLIB variant.
672 */
673 ret = gpiod_count(dev, "cs");
674 if (ret < 0)
675 ret = 0;
676 if (ret == 0 && !spisel_boot)
677 pdata->max_chipselect = 1;
678 else
679 pdata->max_chipselect = ret + spisel_boot;
680 }
681
682 ret = of_address_to_resource(np, 0, &mem);
683 if (ret)
684 goto unmap_out;
685
686 irq = platform_get_irq(ofdev, 0);
687 if (irq < 0) {
688 ret = irq;
689 goto unmap_out;
690 }
691
692 host = fsl_spi_probe(dev, &mem, irq);
693
694 return PTR_ERR_OR_ZERO(host);
695
696unmap_out:
697#if IS_ENABLED(CONFIG_FSL_SOC)
698 if (spisel_boot)
699 iounmap(pinfo->immr_spi_cs);
700#endif
701 return ret;
702}
703
704static void of_fsl_spi_remove(struct platform_device *ofdev)
705{
706 struct spi_controller *host = platform_get_drvdata(ofdev);
707 struct mpc8xxx_spi *mpc8xxx_spi = spi_controller_get_devdata(host);
708
709 fsl_spi_cpm_free(mpc8xxx_spi);
710}
711
712static struct platform_driver of_fsl_spi_driver = {
713 .driver = {
714 .name = "fsl_spi",
715 .of_match_table = of_fsl_spi_match,
716 },
717 .probe = of_fsl_spi_probe,
718 .remove_new = of_fsl_spi_remove,
719};
720
721#ifdef CONFIG_MPC832x_RDB
722/*
723 * XXX XXX XXX
724 * This is "legacy" platform driver, was used by the MPC8323E-RDB boards
725 * only. The driver should go away soon, since newer MPC8323E-RDB's device
726 * tree can work with OpenFirmware driver. But for now we support old trees
727 * as well.
728 */
729static int plat_mpc8xxx_spi_probe(struct platform_device *pdev)
730{
731 struct resource *mem;
732 int irq;
733 struct spi_controller *host;
734
735 if (!dev_get_platdata(&pdev->dev))
736 return -EINVAL;
737
738 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
739 if (!mem)
740 return -EINVAL;
741
742 irq = platform_get_irq(pdev, 0);
743 if (irq < 0)
744 return irq;
745
746 host = fsl_spi_probe(&pdev->dev, mem, irq);
747 return PTR_ERR_OR_ZERO(host);
748}
749
750static void plat_mpc8xxx_spi_remove(struct platform_device *pdev)
751{
752 struct spi_controller *host = platform_get_drvdata(pdev);
753 struct mpc8xxx_spi *mpc8xxx_spi = spi_controller_get_devdata(host);
754
755 fsl_spi_cpm_free(mpc8xxx_spi);
756}
757
758MODULE_ALIAS("platform:mpc8xxx_spi");
759static struct platform_driver mpc8xxx_spi_driver = {
760 .probe = plat_mpc8xxx_spi_probe,
761 .remove_new = plat_mpc8xxx_spi_remove,
762 .driver = {
763 .name = "mpc8xxx_spi",
764 },
765};
766
767static bool legacy_driver_failed;
768
769static void __init legacy_driver_register(void)
770{
771 legacy_driver_failed = platform_driver_register(&mpc8xxx_spi_driver);
772}
773
774static void __exit legacy_driver_unregister(void)
775{
776 if (legacy_driver_failed)
777 return;
778 platform_driver_unregister(&mpc8xxx_spi_driver);
779}
780#else
781static void __init legacy_driver_register(void) {}
782static void __exit legacy_driver_unregister(void) {}
783#endif /* CONFIG_MPC832x_RDB */
784
785static int __init fsl_spi_init(void)
786{
787 legacy_driver_register();
788 return platform_driver_register(&of_fsl_spi_driver);
789}
790module_init(fsl_spi_init);
791
792static void __exit fsl_spi_exit(void)
793{
794 platform_driver_unregister(&of_fsl_spi_driver);
795 legacy_driver_unregister();
796}
797module_exit(fsl_spi_exit);
798
799MODULE_AUTHOR("Kumar Gala");
800MODULE_DESCRIPTION("Simple Freescale SPI Driver");
801MODULE_LICENSE("GPL");
1/*
2 * Freescale SPI controller driver.
3 *
4 * Maintainer: Kumar Gala
5 *
6 * Copyright (C) 2006 Polycom, Inc.
7 * Copyright 2010 Freescale Semiconductor, Inc.
8 *
9 * CPM SPI and QE buffer descriptors mode support:
10 * Copyright (c) 2009 MontaVista Software, Inc.
11 * Author: Anton Vorontsov <avorontsov@ru.mvista.com>
12 *
13 * This program is free software; you can redistribute it and/or modify it
14 * under the terms of the GNU General Public License as published by the
15 * Free Software Foundation; either version 2 of the License, or (at your
16 * option) any later version.
17 */
18#include <linux/module.h>
19#include <linux/types.h>
20#include <linux/kernel.h>
21#include <linux/interrupt.h>
22#include <linux/delay.h>
23#include <linux/irq.h>
24#include <linux/spi/spi.h>
25#include <linux/spi/spi_bitbang.h>
26#include <linux/platform_device.h>
27#include <linux/fsl_devices.h>
28#include <linux/dma-mapping.h>
29#include <linux/mm.h>
30#include <linux/mutex.h>
31#include <linux/of.h>
32#include <linux/of_platform.h>
33#include <linux/gpio.h>
34#include <linux/of_gpio.h>
35
36#include <sysdev/fsl_soc.h>
37#include <asm/cpm.h>
38#include <asm/qe.h>
39
40#include "spi-fsl-lib.h"
41
42/* CPM1 and CPM2 are mutually exclusive. */
43#ifdef CONFIG_CPM1
44#include <asm/cpm1.h>
45#define CPM_SPI_CMD mk_cr_cmd(CPM_CR_CH_SPI, 0)
46#else
47#include <asm/cpm2.h>
48#define CPM_SPI_CMD mk_cr_cmd(CPM_CR_SPI_PAGE, CPM_CR_SPI_SBLOCK, 0, 0)
49#endif
50
51/* SPI Controller registers */
52struct fsl_spi_reg {
53 u8 res1[0x20];
54 __be32 mode;
55 __be32 event;
56 __be32 mask;
57 __be32 command;
58 __be32 transmit;
59 __be32 receive;
60};
61
62/* SPI Controller mode register definitions */
63#define SPMODE_LOOP (1 << 30)
64#define SPMODE_CI_INACTIVEHIGH (1 << 29)
65#define SPMODE_CP_BEGIN_EDGECLK (1 << 28)
66#define SPMODE_DIV16 (1 << 27)
67#define SPMODE_REV (1 << 26)
68#define SPMODE_MS (1 << 25)
69#define SPMODE_ENABLE (1 << 24)
70#define SPMODE_LEN(x) ((x) << 20)
71#define SPMODE_PM(x) ((x) << 16)
72#define SPMODE_OP (1 << 14)
73#define SPMODE_CG(x) ((x) << 7)
74
75/*
76 * Default for SPI Mode:
77 * SPI MODE 0 (inactive low, phase middle, MSB, 8-bit length, slow clk
78 */
79#define SPMODE_INIT_VAL (SPMODE_CI_INACTIVEHIGH | SPMODE_DIV16 | SPMODE_REV | \
80 SPMODE_MS | SPMODE_LEN(7) | SPMODE_PM(0xf))
81
82/* SPIE register values */
83#define SPIE_NE 0x00000200 /* Not empty */
84#define SPIE_NF 0x00000100 /* Not full */
85
86/* SPIM register values */
87#define SPIM_NE 0x00000200 /* Not empty */
88#define SPIM_NF 0x00000100 /* Not full */
89
90#define SPIE_TXB 0x00000200 /* Last char is written to tx fifo */
91#define SPIE_RXB 0x00000100 /* Last char is written to rx buf */
92
93/* SPCOM register values */
94#define SPCOM_STR (1 << 23) /* Start transmit */
95
96#define SPI_PRAM_SIZE 0x100
97#define SPI_MRBLR ((unsigned int)PAGE_SIZE)
98
99static void *fsl_dummy_rx;
100static DEFINE_MUTEX(fsl_dummy_rx_lock);
101static int fsl_dummy_rx_refcnt;
102
103static void fsl_spi_change_mode(struct spi_device *spi)
104{
105 struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
106 struct spi_mpc8xxx_cs *cs = spi->controller_state;
107 struct fsl_spi_reg *reg_base = mspi->reg_base;
108 __be32 __iomem *mode = ®_base->mode;
109 unsigned long flags;
110
111 if (cs->hw_mode == mpc8xxx_spi_read_reg(mode))
112 return;
113
114 /* Turn off IRQs locally to minimize time that SPI is disabled. */
115 local_irq_save(flags);
116
117 /* Turn off SPI unit prior changing mode */
118 mpc8xxx_spi_write_reg(mode, cs->hw_mode & ~SPMODE_ENABLE);
119
120 /* When in CPM mode, we need to reinit tx and rx. */
121 if (mspi->flags & SPI_CPM_MODE) {
122 if (mspi->flags & SPI_QE) {
123 qe_issue_cmd(QE_INIT_TX_RX, mspi->subblock,
124 QE_CR_PROTOCOL_UNSPECIFIED, 0);
125 } else {
126 cpm_command(CPM_SPI_CMD, CPM_CR_INIT_TRX);
127 if (mspi->flags & SPI_CPM1) {
128 out_be16(&mspi->pram->rbptr,
129 in_be16(&mspi->pram->rbase));
130 out_be16(&mspi->pram->tbptr,
131 in_be16(&mspi->pram->tbase));
132 }
133 }
134 }
135 mpc8xxx_spi_write_reg(mode, cs->hw_mode);
136 local_irq_restore(flags);
137}
138
139static void fsl_spi_chipselect(struct spi_device *spi, int value)
140{
141 struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master);
142 struct fsl_spi_platform_data *pdata;
143 bool pol = spi->mode & SPI_CS_HIGH;
144 struct spi_mpc8xxx_cs *cs = spi->controller_state;
145
146 pdata = spi->dev.parent->parent->platform_data;
147
148 if (value == BITBANG_CS_INACTIVE) {
149 if (pdata->cs_control)
150 pdata->cs_control(spi, !pol);
151 }
152
153 if (value == BITBANG_CS_ACTIVE) {
154 mpc8xxx_spi->rx_shift = cs->rx_shift;
155 mpc8xxx_spi->tx_shift = cs->tx_shift;
156 mpc8xxx_spi->get_rx = cs->get_rx;
157 mpc8xxx_spi->get_tx = cs->get_tx;
158
159 fsl_spi_change_mode(spi);
160
161 if (pdata->cs_control)
162 pdata->cs_control(spi, pol);
163 }
164}
165
166static int mspi_apply_cpu_mode_quirks(struct spi_mpc8xxx_cs *cs,
167 struct spi_device *spi,
168 struct mpc8xxx_spi *mpc8xxx_spi,
169 int bits_per_word)
170{
171 cs->rx_shift = 0;
172 cs->tx_shift = 0;
173 if (bits_per_word <= 8) {
174 cs->get_rx = mpc8xxx_spi_rx_buf_u8;
175 cs->get_tx = mpc8xxx_spi_tx_buf_u8;
176 if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) {
177 cs->rx_shift = 16;
178 cs->tx_shift = 24;
179 }
180 } else if (bits_per_word <= 16) {
181 cs->get_rx = mpc8xxx_spi_rx_buf_u16;
182 cs->get_tx = mpc8xxx_spi_tx_buf_u16;
183 if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) {
184 cs->rx_shift = 16;
185 cs->tx_shift = 16;
186 }
187 } else if (bits_per_word <= 32) {
188 cs->get_rx = mpc8xxx_spi_rx_buf_u32;
189 cs->get_tx = mpc8xxx_spi_tx_buf_u32;
190 } else
191 return -EINVAL;
192
193 if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE &&
194 spi->mode & SPI_LSB_FIRST) {
195 cs->tx_shift = 0;
196 if (bits_per_word <= 8)
197 cs->rx_shift = 8;
198 else
199 cs->rx_shift = 0;
200 }
201 mpc8xxx_spi->rx_shift = cs->rx_shift;
202 mpc8xxx_spi->tx_shift = cs->tx_shift;
203 mpc8xxx_spi->get_rx = cs->get_rx;
204 mpc8xxx_spi->get_tx = cs->get_tx;
205
206 return bits_per_word;
207}
208
209static int mspi_apply_qe_mode_quirks(struct spi_mpc8xxx_cs *cs,
210 struct spi_device *spi,
211 int bits_per_word)
212{
213 /* QE uses Little Endian for words > 8
214 * so transform all words > 8 into 8 bits
215 * Unfortnatly that doesn't work for LSB so
216 * reject these for now */
217 /* Note: 32 bits word, LSB works iff
218 * tfcr/rfcr is set to CPMFCR_GBL */
219 if (spi->mode & SPI_LSB_FIRST &&
220 bits_per_word > 8)
221 return -EINVAL;
222 if (bits_per_word > 8)
223 return 8; /* pretend its 8 bits */
224 return bits_per_word;
225}
226
227static int fsl_spi_setup_transfer(struct spi_device *spi,
228 struct spi_transfer *t)
229{
230 struct mpc8xxx_spi *mpc8xxx_spi;
231 int bits_per_word = 0;
232 u8 pm;
233 u32 hz = 0;
234 struct spi_mpc8xxx_cs *cs = spi->controller_state;
235
236 mpc8xxx_spi = spi_master_get_devdata(spi->master);
237
238 if (t) {
239 bits_per_word = t->bits_per_word;
240 hz = t->speed_hz;
241 }
242
243 /* spi_transfer level calls that work per-word */
244 if (!bits_per_word)
245 bits_per_word = spi->bits_per_word;
246
247 /* Make sure its a bit width we support [4..16, 32] */
248 if ((bits_per_word < 4)
249 || ((bits_per_word > 16) && (bits_per_word != 32)))
250 return -EINVAL;
251
252 if (!hz)
253 hz = spi->max_speed_hz;
254
255 if (!(mpc8xxx_spi->flags & SPI_CPM_MODE))
256 bits_per_word = mspi_apply_cpu_mode_quirks(cs, spi,
257 mpc8xxx_spi,
258 bits_per_word);
259 else if (mpc8xxx_spi->flags & SPI_QE)
260 bits_per_word = mspi_apply_qe_mode_quirks(cs, spi,
261 bits_per_word);
262
263 if (bits_per_word < 0)
264 return bits_per_word;
265
266 if (bits_per_word == 32)
267 bits_per_word = 0;
268 else
269 bits_per_word = bits_per_word - 1;
270
271 /* mask out bits we are going to set */
272 cs->hw_mode &= ~(SPMODE_LEN(0xF) | SPMODE_DIV16
273 | SPMODE_PM(0xF));
274
275 cs->hw_mode |= SPMODE_LEN(bits_per_word);
276
277 if ((mpc8xxx_spi->spibrg / hz) > 64) {
278 cs->hw_mode |= SPMODE_DIV16;
279 pm = (mpc8xxx_spi->spibrg - 1) / (hz * 64) + 1;
280
281 WARN_ONCE(pm > 16, "%s: Requested speed is too low: %d Hz. "
282 "Will use %d Hz instead.\n", dev_name(&spi->dev),
283 hz, mpc8xxx_spi->spibrg / 1024);
284 if (pm > 16)
285 pm = 16;
286 } else {
287 pm = (mpc8xxx_spi->spibrg - 1) / (hz * 4) + 1;
288 }
289 if (pm)
290 pm--;
291
292 cs->hw_mode |= SPMODE_PM(pm);
293
294 fsl_spi_change_mode(spi);
295 return 0;
296}
297
298static void fsl_spi_cpm_bufs_start(struct mpc8xxx_spi *mspi)
299{
300 struct cpm_buf_desc __iomem *tx_bd = mspi->tx_bd;
301 struct cpm_buf_desc __iomem *rx_bd = mspi->rx_bd;
302 unsigned int xfer_len = min(mspi->count, SPI_MRBLR);
303 unsigned int xfer_ofs;
304 struct fsl_spi_reg *reg_base = mspi->reg_base;
305
306 xfer_ofs = mspi->xfer_in_progress->len - mspi->count;
307
308 if (mspi->rx_dma == mspi->dma_dummy_rx)
309 out_be32(&rx_bd->cbd_bufaddr, mspi->rx_dma);
310 else
311 out_be32(&rx_bd->cbd_bufaddr, mspi->rx_dma + xfer_ofs);
312 out_be16(&rx_bd->cbd_datlen, 0);
313 out_be16(&rx_bd->cbd_sc, BD_SC_EMPTY | BD_SC_INTRPT | BD_SC_WRAP);
314
315 if (mspi->tx_dma == mspi->dma_dummy_tx)
316 out_be32(&tx_bd->cbd_bufaddr, mspi->tx_dma);
317 else
318 out_be32(&tx_bd->cbd_bufaddr, mspi->tx_dma + xfer_ofs);
319 out_be16(&tx_bd->cbd_datlen, xfer_len);
320 out_be16(&tx_bd->cbd_sc, BD_SC_READY | BD_SC_INTRPT | BD_SC_WRAP |
321 BD_SC_LAST);
322
323 /* start transfer */
324 mpc8xxx_spi_write_reg(®_base->command, SPCOM_STR);
325}
326
327static int fsl_spi_cpm_bufs(struct mpc8xxx_spi *mspi,
328 struct spi_transfer *t, bool is_dma_mapped)
329{
330 struct device *dev = mspi->dev;
331 struct fsl_spi_reg *reg_base = mspi->reg_base;
332
333 if (is_dma_mapped) {
334 mspi->map_tx_dma = 0;
335 mspi->map_rx_dma = 0;
336 } else {
337 mspi->map_tx_dma = 1;
338 mspi->map_rx_dma = 1;
339 }
340
341 if (!t->tx_buf) {
342 mspi->tx_dma = mspi->dma_dummy_tx;
343 mspi->map_tx_dma = 0;
344 }
345
346 if (!t->rx_buf) {
347 mspi->rx_dma = mspi->dma_dummy_rx;
348 mspi->map_rx_dma = 0;
349 }
350
351 if (mspi->map_tx_dma) {
352 void *nonconst_tx = (void *)mspi->tx; /* shut up gcc */
353
354 mspi->tx_dma = dma_map_single(dev, nonconst_tx, t->len,
355 DMA_TO_DEVICE);
356 if (dma_mapping_error(dev, mspi->tx_dma)) {
357 dev_err(dev, "unable to map tx dma\n");
358 return -ENOMEM;
359 }
360 } else if (t->tx_buf) {
361 mspi->tx_dma = t->tx_dma;
362 }
363
364 if (mspi->map_rx_dma) {
365 mspi->rx_dma = dma_map_single(dev, mspi->rx, t->len,
366 DMA_FROM_DEVICE);
367 if (dma_mapping_error(dev, mspi->rx_dma)) {
368 dev_err(dev, "unable to map rx dma\n");
369 goto err_rx_dma;
370 }
371 } else if (t->rx_buf) {
372 mspi->rx_dma = t->rx_dma;
373 }
374
375 /* enable rx ints */
376 mpc8xxx_spi_write_reg(®_base->mask, SPIE_RXB);
377
378 mspi->xfer_in_progress = t;
379 mspi->count = t->len;
380
381 /* start CPM transfers */
382 fsl_spi_cpm_bufs_start(mspi);
383
384 return 0;
385
386err_rx_dma:
387 if (mspi->map_tx_dma)
388 dma_unmap_single(dev, mspi->tx_dma, t->len, DMA_TO_DEVICE);
389 return -ENOMEM;
390}
391
392static void fsl_spi_cpm_bufs_complete(struct mpc8xxx_spi *mspi)
393{
394 struct device *dev = mspi->dev;
395 struct spi_transfer *t = mspi->xfer_in_progress;
396
397 if (mspi->map_tx_dma)
398 dma_unmap_single(dev, mspi->tx_dma, t->len, DMA_TO_DEVICE);
399 if (mspi->map_rx_dma)
400 dma_unmap_single(dev, mspi->rx_dma, t->len, DMA_FROM_DEVICE);
401 mspi->xfer_in_progress = NULL;
402}
403
404static int fsl_spi_cpu_bufs(struct mpc8xxx_spi *mspi,
405 struct spi_transfer *t, unsigned int len)
406{
407 u32 word;
408 struct fsl_spi_reg *reg_base = mspi->reg_base;
409
410 mspi->count = len;
411
412 /* enable rx ints */
413 mpc8xxx_spi_write_reg(®_base->mask, SPIM_NE);
414
415 /* transmit word */
416 word = mspi->get_tx(mspi);
417 mpc8xxx_spi_write_reg(®_base->transmit, word);
418
419 return 0;
420}
421
422static int fsl_spi_bufs(struct spi_device *spi, struct spi_transfer *t,
423 bool is_dma_mapped)
424{
425 struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master);
426 struct fsl_spi_reg *reg_base;
427 unsigned int len = t->len;
428 u8 bits_per_word;
429 int ret;
430
431 reg_base = mpc8xxx_spi->reg_base;
432 bits_per_word = spi->bits_per_word;
433 if (t->bits_per_word)
434 bits_per_word = t->bits_per_word;
435
436 if (bits_per_word > 8) {
437 /* invalid length? */
438 if (len & 1)
439 return -EINVAL;
440 len /= 2;
441 }
442 if (bits_per_word > 16) {
443 /* invalid length? */
444 if (len & 1)
445 return -EINVAL;
446 len /= 2;
447 }
448
449 mpc8xxx_spi->tx = t->tx_buf;
450 mpc8xxx_spi->rx = t->rx_buf;
451
452 INIT_COMPLETION(mpc8xxx_spi->done);
453
454 if (mpc8xxx_spi->flags & SPI_CPM_MODE)
455 ret = fsl_spi_cpm_bufs(mpc8xxx_spi, t, is_dma_mapped);
456 else
457 ret = fsl_spi_cpu_bufs(mpc8xxx_spi, t, len);
458 if (ret)
459 return ret;
460
461 wait_for_completion(&mpc8xxx_spi->done);
462
463 /* disable rx ints */
464 mpc8xxx_spi_write_reg(®_base->mask, 0);
465
466 if (mpc8xxx_spi->flags & SPI_CPM_MODE)
467 fsl_spi_cpm_bufs_complete(mpc8xxx_spi);
468
469 return mpc8xxx_spi->count;
470}
471
472static void fsl_spi_do_one_msg(struct spi_message *m)
473{
474 struct spi_device *spi = m->spi;
475 struct spi_transfer *t;
476 unsigned int cs_change;
477 const int nsecs = 50;
478 int status;
479
480 cs_change = 1;
481 status = 0;
482 list_for_each_entry(t, &m->transfers, transfer_list) {
483 if (t->bits_per_word || t->speed_hz) {
484 /* Don't allow changes if CS is active */
485 status = -EINVAL;
486
487 if (cs_change)
488 status = fsl_spi_setup_transfer(spi, t);
489 if (status < 0)
490 break;
491 }
492
493 if (cs_change) {
494 fsl_spi_chipselect(spi, BITBANG_CS_ACTIVE);
495 ndelay(nsecs);
496 }
497 cs_change = t->cs_change;
498 if (t->len)
499 status = fsl_spi_bufs(spi, t, m->is_dma_mapped);
500 if (status) {
501 status = -EMSGSIZE;
502 break;
503 }
504 m->actual_length += t->len;
505
506 if (t->delay_usecs)
507 udelay(t->delay_usecs);
508
509 if (cs_change) {
510 ndelay(nsecs);
511 fsl_spi_chipselect(spi, BITBANG_CS_INACTIVE);
512 ndelay(nsecs);
513 }
514 }
515
516 m->status = status;
517 m->complete(m->context);
518
519 if (status || !cs_change) {
520 ndelay(nsecs);
521 fsl_spi_chipselect(spi, BITBANG_CS_INACTIVE);
522 }
523
524 fsl_spi_setup_transfer(spi, NULL);
525}
526
527static int fsl_spi_setup(struct spi_device *spi)
528{
529 struct mpc8xxx_spi *mpc8xxx_spi;
530 struct fsl_spi_reg *reg_base;
531 int retval;
532 u32 hw_mode;
533 struct spi_mpc8xxx_cs *cs = spi->controller_state;
534
535 if (!spi->max_speed_hz)
536 return -EINVAL;
537
538 if (!cs) {
539 cs = kzalloc(sizeof *cs, GFP_KERNEL);
540 if (!cs)
541 return -ENOMEM;
542 spi->controller_state = cs;
543 }
544 mpc8xxx_spi = spi_master_get_devdata(spi->master);
545
546 reg_base = mpc8xxx_spi->reg_base;
547
548 hw_mode = cs->hw_mode; /* Save original settings */
549 cs->hw_mode = mpc8xxx_spi_read_reg(®_base->mode);
550 /* mask out bits we are going to set */
551 cs->hw_mode &= ~(SPMODE_CP_BEGIN_EDGECLK | SPMODE_CI_INACTIVEHIGH
552 | SPMODE_REV | SPMODE_LOOP);
553
554 if (spi->mode & SPI_CPHA)
555 cs->hw_mode |= SPMODE_CP_BEGIN_EDGECLK;
556 if (spi->mode & SPI_CPOL)
557 cs->hw_mode |= SPMODE_CI_INACTIVEHIGH;
558 if (!(spi->mode & SPI_LSB_FIRST))
559 cs->hw_mode |= SPMODE_REV;
560 if (spi->mode & SPI_LOOP)
561 cs->hw_mode |= SPMODE_LOOP;
562
563 retval = fsl_spi_setup_transfer(spi, NULL);
564 if (retval < 0) {
565 cs->hw_mode = hw_mode; /* Restore settings */
566 return retval;
567 }
568 return 0;
569}
570
571static void fsl_spi_cpm_irq(struct mpc8xxx_spi *mspi, u32 events)
572{
573 u16 len;
574 struct fsl_spi_reg *reg_base = mspi->reg_base;
575
576 dev_dbg(mspi->dev, "%s: bd datlen %d, count %d\n", __func__,
577 in_be16(&mspi->rx_bd->cbd_datlen), mspi->count);
578
579 len = in_be16(&mspi->rx_bd->cbd_datlen);
580 if (len > mspi->count) {
581 WARN_ON(1);
582 len = mspi->count;
583 }
584
585 /* Clear the events */
586 mpc8xxx_spi_write_reg(®_base->event, events);
587
588 mspi->count -= len;
589 if (mspi->count)
590 fsl_spi_cpm_bufs_start(mspi);
591 else
592 complete(&mspi->done);
593}
594
595static void fsl_spi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events)
596{
597 struct fsl_spi_reg *reg_base = mspi->reg_base;
598
599 /* We need handle RX first */
600 if (events & SPIE_NE) {
601 u32 rx_data = mpc8xxx_spi_read_reg(®_base->receive);
602
603 if (mspi->rx)
604 mspi->get_rx(rx_data, mspi);
605 }
606
607 if ((events & SPIE_NF) == 0)
608 /* spin until TX is done */
609 while (((events =
610 mpc8xxx_spi_read_reg(®_base->event)) &
611 SPIE_NF) == 0)
612 cpu_relax();
613
614 /* Clear the events */
615 mpc8xxx_spi_write_reg(®_base->event, events);
616
617 mspi->count -= 1;
618 if (mspi->count) {
619 u32 word = mspi->get_tx(mspi);
620
621 mpc8xxx_spi_write_reg(®_base->transmit, word);
622 } else {
623 complete(&mspi->done);
624 }
625}
626
627static irqreturn_t fsl_spi_irq(s32 irq, void *context_data)
628{
629 struct mpc8xxx_spi *mspi = context_data;
630 irqreturn_t ret = IRQ_NONE;
631 u32 events;
632 struct fsl_spi_reg *reg_base = mspi->reg_base;
633
634 /* Get interrupt events(tx/rx) */
635 events = mpc8xxx_spi_read_reg(®_base->event);
636 if (events)
637 ret = IRQ_HANDLED;
638
639 dev_dbg(mspi->dev, "%s: events %x\n", __func__, events);
640
641 if (mspi->flags & SPI_CPM_MODE)
642 fsl_spi_cpm_irq(mspi, events);
643 else
644 fsl_spi_cpu_irq(mspi, events);
645
646 return ret;
647}
648
649static void *fsl_spi_alloc_dummy_rx(void)
650{
651 mutex_lock(&fsl_dummy_rx_lock);
652
653 if (!fsl_dummy_rx)
654 fsl_dummy_rx = kmalloc(SPI_MRBLR, GFP_KERNEL);
655 if (fsl_dummy_rx)
656 fsl_dummy_rx_refcnt++;
657
658 mutex_unlock(&fsl_dummy_rx_lock);
659
660 return fsl_dummy_rx;
661}
662
663static void fsl_spi_free_dummy_rx(void)
664{
665 mutex_lock(&fsl_dummy_rx_lock);
666
667 switch (fsl_dummy_rx_refcnt) {
668 case 0:
669 WARN_ON(1);
670 break;
671 case 1:
672 kfree(fsl_dummy_rx);
673 fsl_dummy_rx = NULL;
674 /* fall through */
675 default:
676 fsl_dummy_rx_refcnt--;
677 break;
678 }
679
680 mutex_unlock(&fsl_dummy_rx_lock);
681}
682
683static unsigned long fsl_spi_cpm_get_pram(struct mpc8xxx_spi *mspi)
684{
685 struct device *dev = mspi->dev;
686 struct device_node *np = dev->of_node;
687 const u32 *iprop;
688 int size;
689 void __iomem *spi_base;
690 unsigned long pram_ofs = -ENOMEM;
691
692 /* Can't use of_address_to_resource(), QE muram isn't at 0. */
693 iprop = of_get_property(np, "reg", &size);
694
695 /* QE with a fixed pram location? */
696 if (mspi->flags & SPI_QE && iprop && size == sizeof(*iprop) * 4)
697 return cpm_muram_alloc_fixed(iprop[2], SPI_PRAM_SIZE);
698
699 /* QE but with a dynamic pram location? */
700 if (mspi->flags & SPI_QE) {
701 pram_ofs = cpm_muram_alloc(SPI_PRAM_SIZE, 64);
702 qe_issue_cmd(QE_ASSIGN_PAGE_TO_DEVICE, mspi->subblock,
703 QE_CR_PROTOCOL_UNSPECIFIED, pram_ofs);
704 return pram_ofs;
705 }
706
707 spi_base = of_iomap(np, 1);
708 if (spi_base == NULL)
709 return -EINVAL;
710
711 if (mspi->flags & SPI_CPM2) {
712 pram_ofs = cpm_muram_alloc(SPI_PRAM_SIZE, 64);
713 out_be16(spi_base, pram_ofs);
714 } else {
715 struct spi_pram __iomem *pram = spi_base;
716 u16 rpbase = in_be16(&pram->rpbase);
717
718 /* Microcode relocation patch applied? */
719 if (rpbase)
720 pram_ofs = rpbase;
721 else {
722 pram_ofs = cpm_muram_alloc(SPI_PRAM_SIZE, 64);
723 out_be16(spi_base, pram_ofs);
724 }
725 }
726
727 iounmap(spi_base);
728 return pram_ofs;
729}
730
731static int fsl_spi_cpm_init(struct mpc8xxx_spi *mspi)
732{
733 struct device *dev = mspi->dev;
734 struct device_node *np = dev->of_node;
735 const u32 *iprop;
736 int size;
737 unsigned long pram_ofs;
738 unsigned long bds_ofs;
739
740 if (!(mspi->flags & SPI_CPM_MODE))
741 return 0;
742
743 if (!fsl_spi_alloc_dummy_rx())
744 return -ENOMEM;
745
746 if (mspi->flags & SPI_QE) {
747 iprop = of_get_property(np, "cell-index", &size);
748 if (iprop && size == sizeof(*iprop))
749 mspi->subblock = *iprop;
750
751 switch (mspi->subblock) {
752 default:
753 dev_warn(dev, "cell-index unspecified, assuming SPI1");
754 /* fall through */
755 case 0:
756 mspi->subblock = QE_CR_SUBBLOCK_SPI1;
757 break;
758 case 1:
759 mspi->subblock = QE_CR_SUBBLOCK_SPI2;
760 break;
761 }
762 }
763
764 pram_ofs = fsl_spi_cpm_get_pram(mspi);
765 if (IS_ERR_VALUE(pram_ofs)) {
766 dev_err(dev, "can't allocate spi parameter ram\n");
767 goto err_pram;
768 }
769
770 bds_ofs = cpm_muram_alloc(sizeof(*mspi->tx_bd) +
771 sizeof(*mspi->rx_bd), 8);
772 if (IS_ERR_VALUE(bds_ofs)) {
773 dev_err(dev, "can't allocate bds\n");
774 goto err_bds;
775 }
776
777 mspi->dma_dummy_tx = dma_map_single(dev, empty_zero_page, PAGE_SIZE,
778 DMA_TO_DEVICE);
779 if (dma_mapping_error(dev, mspi->dma_dummy_tx)) {
780 dev_err(dev, "unable to map dummy tx buffer\n");
781 goto err_dummy_tx;
782 }
783
784 mspi->dma_dummy_rx = dma_map_single(dev, fsl_dummy_rx, SPI_MRBLR,
785 DMA_FROM_DEVICE);
786 if (dma_mapping_error(dev, mspi->dma_dummy_rx)) {
787 dev_err(dev, "unable to map dummy rx buffer\n");
788 goto err_dummy_rx;
789 }
790
791 mspi->pram = cpm_muram_addr(pram_ofs);
792
793 mspi->tx_bd = cpm_muram_addr(bds_ofs);
794 mspi->rx_bd = cpm_muram_addr(bds_ofs + sizeof(*mspi->tx_bd));
795
796 /* Initialize parameter ram. */
797 out_be16(&mspi->pram->tbase, cpm_muram_offset(mspi->tx_bd));
798 out_be16(&mspi->pram->rbase, cpm_muram_offset(mspi->rx_bd));
799 out_8(&mspi->pram->tfcr, CPMFCR_EB | CPMFCR_GBL);
800 out_8(&mspi->pram->rfcr, CPMFCR_EB | CPMFCR_GBL);
801 out_be16(&mspi->pram->mrblr, SPI_MRBLR);
802 out_be32(&mspi->pram->rstate, 0);
803 out_be32(&mspi->pram->rdp, 0);
804 out_be16(&mspi->pram->rbptr, 0);
805 out_be16(&mspi->pram->rbc, 0);
806 out_be32(&mspi->pram->rxtmp, 0);
807 out_be32(&mspi->pram->tstate, 0);
808 out_be32(&mspi->pram->tdp, 0);
809 out_be16(&mspi->pram->tbptr, 0);
810 out_be16(&mspi->pram->tbc, 0);
811 out_be32(&mspi->pram->txtmp, 0);
812
813 return 0;
814
815err_dummy_rx:
816 dma_unmap_single(dev, mspi->dma_dummy_tx, PAGE_SIZE, DMA_TO_DEVICE);
817err_dummy_tx:
818 cpm_muram_free(bds_ofs);
819err_bds:
820 cpm_muram_free(pram_ofs);
821err_pram:
822 fsl_spi_free_dummy_rx();
823 return -ENOMEM;
824}
825
826static void fsl_spi_cpm_free(struct mpc8xxx_spi *mspi)
827{
828 struct device *dev = mspi->dev;
829
830 if (!(mspi->flags & SPI_CPM_MODE))
831 return;
832
833 dma_unmap_single(dev, mspi->dma_dummy_rx, SPI_MRBLR, DMA_FROM_DEVICE);
834 dma_unmap_single(dev, mspi->dma_dummy_tx, PAGE_SIZE, DMA_TO_DEVICE);
835 cpm_muram_free(cpm_muram_offset(mspi->tx_bd));
836 cpm_muram_free(cpm_muram_offset(mspi->pram));
837 fsl_spi_free_dummy_rx();
838}
839
840static void fsl_spi_remove(struct mpc8xxx_spi *mspi)
841{
842 iounmap(mspi->reg_base);
843 fsl_spi_cpm_free(mspi);
844}
845
846static struct spi_master * __devinit fsl_spi_probe(struct device *dev,
847 struct resource *mem, unsigned int irq)
848{
849 struct fsl_spi_platform_data *pdata = dev->platform_data;
850 struct spi_master *master;
851 struct mpc8xxx_spi *mpc8xxx_spi;
852 struct fsl_spi_reg *reg_base;
853 u32 regval;
854 int ret = 0;
855
856 master = spi_alloc_master(dev, sizeof(struct mpc8xxx_spi));
857 if (master == NULL) {
858 ret = -ENOMEM;
859 goto err;
860 }
861
862 dev_set_drvdata(dev, master);
863
864 ret = mpc8xxx_spi_probe(dev, mem, irq);
865 if (ret)
866 goto err_probe;
867
868 master->setup = fsl_spi_setup;
869
870 mpc8xxx_spi = spi_master_get_devdata(master);
871 mpc8xxx_spi->spi_do_one_msg = fsl_spi_do_one_msg;
872 mpc8xxx_spi->spi_remove = fsl_spi_remove;
873
874
875 ret = fsl_spi_cpm_init(mpc8xxx_spi);
876 if (ret)
877 goto err_cpm_init;
878
879 if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) {
880 mpc8xxx_spi->rx_shift = 16;
881 mpc8xxx_spi->tx_shift = 24;
882 }
883
884 mpc8xxx_spi->reg_base = ioremap(mem->start, resource_size(mem));
885 if (mpc8xxx_spi->reg_base == NULL) {
886 ret = -ENOMEM;
887 goto err_ioremap;
888 }
889
890 /* Register for SPI Interrupt */
891 ret = request_irq(mpc8xxx_spi->irq, fsl_spi_irq,
892 0, "fsl_spi", mpc8xxx_spi);
893
894 if (ret != 0)
895 goto free_irq;
896
897 reg_base = mpc8xxx_spi->reg_base;
898
899 /* SPI controller initializations */
900 mpc8xxx_spi_write_reg(®_base->mode, 0);
901 mpc8xxx_spi_write_reg(®_base->mask, 0);
902 mpc8xxx_spi_write_reg(®_base->command, 0);
903 mpc8xxx_spi_write_reg(®_base->event, 0xffffffff);
904
905 /* Enable SPI interface */
906 regval = pdata->initial_spmode | SPMODE_INIT_VAL | SPMODE_ENABLE;
907 if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE)
908 regval |= SPMODE_OP;
909
910 mpc8xxx_spi_write_reg(®_base->mode, regval);
911
912 ret = spi_register_master(master);
913 if (ret < 0)
914 goto unreg_master;
915
916 dev_info(dev, "at 0x%p (irq = %d), %s mode\n", reg_base,
917 mpc8xxx_spi->irq, mpc8xxx_spi_strmode(mpc8xxx_spi->flags));
918
919 return master;
920
921unreg_master:
922 free_irq(mpc8xxx_spi->irq, mpc8xxx_spi);
923free_irq:
924 iounmap(mpc8xxx_spi->reg_base);
925err_ioremap:
926 fsl_spi_cpm_free(mpc8xxx_spi);
927err_cpm_init:
928err_probe:
929 spi_master_put(master);
930err:
931 return ERR_PTR(ret);
932}
933
934static void fsl_spi_cs_control(struct spi_device *spi, bool on)
935{
936 struct device *dev = spi->dev.parent->parent;
937 struct mpc8xxx_spi_probe_info *pinfo = to_of_pinfo(dev->platform_data);
938 u16 cs = spi->chip_select;
939 int gpio = pinfo->gpios[cs];
940 bool alow = pinfo->alow_flags[cs];
941
942 gpio_set_value(gpio, on ^ alow);
943}
944
945static int of_fsl_spi_get_chipselects(struct device *dev)
946{
947 struct device_node *np = dev->of_node;
948 struct fsl_spi_platform_data *pdata = dev->platform_data;
949 struct mpc8xxx_spi_probe_info *pinfo = to_of_pinfo(pdata);
950 unsigned int ngpios;
951 int i = 0;
952 int ret;
953
954 ngpios = of_gpio_count(np);
955 if (!ngpios) {
956 /*
957 * SPI w/o chip-select line. One SPI device is still permitted
958 * though.
959 */
960 pdata->max_chipselect = 1;
961 return 0;
962 }
963
964 pinfo->gpios = kmalloc(ngpios * sizeof(*pinfo->gpios), GFP_KERNEL);
965 if (!pinfo->gpios)
966 return -ENOMEM;
967 memset(pinfo->gpios, -1, ngpios * sizeof(*pinfo->gpios));
968
969 pinfo->alow_flags = kzalloc(ngpios * sizeof(*pinfo->alow_flags),
970 GFP_KERNEL);
971 if (!pinfo->alow_flags) {
972 ret = -ENOMEM;
973 goto err_alloc_flags;
974 }
975
976 for (; i < ngpios; i++) {
977 int gpio;
978 enum of_gpio_flags flags;
979
980 gpio = of_get_gpio_flags(np, i, &flags);
981 if (!gpio_is_valid(gpio)) {
982 dev_err(dev, "invalid gpio #%d: %d\n", i, gpio);
983 ret = gpio;
984 goto err_loop;
985 }
986
987 ret = gpio_request(gpio, dev_name(dev));
988 if (ret) {
989 dev_err(dev, "can't request gpio #%d: %d\n", i, ret);
990 goto err_loop;
991 }
992
993 pinfo->gpios[i] = gpio;
994 pinfo->alow_flags[i] = flags & OF_GPIO_ACTIVE_LOW;
995
996 ret = gpio_direction_output(pinfo->gpios[i],
997 pinfo->alow_flags[i]);
998 if (ret) {
999 dev_err(dev, "can't set output direction for gpio "
1000 "#%d: %d\n", i, ret);
1001 goto err_loop;
1002 }
1003 }
1004
1005 pdata->max_chipselect = ngpios;
1006 pdata->cs_control = fsl_spi_cs_control;
1007
1008 return 0;
1009
1010err_loop:
1011 while (i >= 0) {
1012 if (gpio_is_valid(pinfo->gpios[i]))
1013 gpio_free(pinfo->gpios[i]);
1014 i--;
1015 }
1016
1017 kfree(pinfo->alow_flags);
1018 pinfo->alow_flags = NULL;
1019err_alloc_flags:
1020 kfree(pinfo->gpios);
1021 pinfo->gpios = NULL;
1022 return ret;
1023}
1024
1025static int of_fsl_spi_free_chipselects(struct device *dev)
1026{
1027 struct fsl_spi_platform_data *pdata = dev->platform_data;
1028 struct mpc8xxx_spi_probe_info *pinfo = to_of_pinfo(pdata);
1029 int i;
1030
1031 if (!pinfo->gpios)
1032 return 0;
1033
1034 for (i = 0; i < pdata->max_chipselect; i++) {
1035 if (gpio_is_valid(pinfo->gpios[i]))
1036 gpio_free(pinfo->gpios[i]);
1037 }
1038
1039 kfree(pinfo->gpios);
1040 kfree(pinfo->alow_flags);
1041 return 0;
1042}
1043
1044static int __devinit of_fsl_spi_probe(struct platform_device *ofdev)
1045{
1046 struct device *dev = &ofdev->dev;
1047 struct device_node *np = ofdev->dev.of_node;
1048 struct spi_master *master;
1049 struct resource mem;
1050 struct resource irq;
1051 int ret = -ENOMEM;
1052
1053 ret = of_mpc8xxx_spi_probe(ofdev);
1054 if (ret)
1055 return ret;
1056
1057 ret = of_fsl_spi_get_chipselects(dev);
1058 if (ret)
1059 goto err;
1060
1061 ret = of_address_to_resource(np, 0, &mem);
1062 if (ret)
1063 goto err;
1064
1065 ret = of_irq_to_resource(np, 0, &irq);
1066 if (!ret) {
1067 ret = -EINVAL;
1068 goto err;
1069 }
1070
1071 master = fsl_spi_probe(dev, &mem, irq.start);
1072 if (IS_ERR(master)) {
1073 ret = PTR_ERR(master);
1074 goto err;
1075 }
1076
1077 return 0;
1078
1079err:
1080 of_fsl_spi_free_chipselects(dev);
1081 return ret;
1082}
1083
1084static int __devexit of_fsl_spi_remove(struct platform_device *ofdev)
1085{
1086 int ret;
1087
1088 ret = mpc8xxx_spi_remove(&ofdev->dev);
1089 if (ret)
1090 return ret;
1091 of_fsl_spi_free_chipselects(&ofdev->dev);
1092 return 0;
1093}
1094
1095static const struct of_device_id of_fsl_spi_match[] = {
1096 { .compatible = "fsl,spi" },
1097 {}
1098};
1099MODULE_DEVICE_TABLE(of, of_fsl_spi_match);
1100
1101static struct platform_driver of_fsl_spi_driver = {
1102 .driver = {
1103 .name = "fsl_spi",
1104 .owner = THIS_MODULE,
1105 .of_match_table = of_fsl_spi_match,
1106 },
1107 .probe = of_fsl_spi_probe,
1108 .remove = __devexit_p(of_fsl_spi_remove),
1109};
1110
1111#ifdef CONFIG_MPC832x_RDB
1112/*
1113 * XXX XXX XXX
1114 * This is "legacy" platform driver, was used by the MPC8323E-RDB boards
1115 * only. The driver should go away soon, since newer MPC8323E-RDB's device
1116 * tree can work with OpenFirmware driver. But for now we support old trees
1117 * as well.
1118 */
1119static int __devinit plat_mpc8xxx_spi_probe(struct platform_device *pdev)
1120{
1121 struct resource *mem;
1122 int irq;
1123 struct spi_master *master;
1124
1125 if (!pdev->dev.platform_data)
1126 return -EINVAL;
1127
1128 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1129 if (!mem)
1130 return -EINVAL;
1131
1132 irq = platform_get_irq(pdev, 0);
1133 if (irq <= 0)
1134 return -EINVAL;
1135
1136 master = fsl_spi_probe(&pdev->dev, mem, irq);
1137 if (IS_ERR(master))
1138 return PTR_ERR(master);
1139 return 0;
1140}
1141
1142static int __devexit plat_mpc8xxx_spi_remove(struct platform_device *pdev)
1143{
1144 return mpc8xxx_spi_remove(&pdev->dev);
1145}
1146
1147MODULE_ALIAS("platform:mpc8xxx_spi");
1148static struct platform_driver mpc8xxx_spi_driver = {
1149 .probe = plat_mpc8xxx_spi_probe,
1150 .remove = __devexit_p(plat_mpc8xxx_spi_remove),
1151 .driver = {
1152 .name = "mpc8xxx_spi",
1153 .owner = THIS_MODULE,
1154 },
1155};
1156
1157static bool legacy_driver_failed;
1158
1159static void __init legacy_driver_register(void)
1160{
1161 legacy_driver_failed = platform_driver_register(&mpc8xxx_spi_driver);
1162}
1163
1164static void __exit legacy_driver_unregister(void)
1165{
1166 if (legacy_driver_failed)
1167 return;
1168 platform_driver_unregister(&mpc8xxx_spi_driver);
1169}
1170#else
1171static void __init legacy_driver_register(void) {}
1172static void __exit legacy_driver_unregister(void) {}
1173#endif /* CONFIG_MPC832x_RDB */
1174
1175static int __init fsl_spi_init(void)
1176{
1177 legacy_driver_register();
1178 return platform_driver_register(&of_fsl_spi_driver);
1179}
1180module_init(fsl_spi_init);
1181
1182static void __exit fsl_spi_exit(void)
1183{
1184 platform_driver_unregister(&of_fsl_spi_driver);
1185 legacy_driver_unregister();
1186}
1187module_exit(fsl_spi_exit);
1188
1189MODULE_AUTHOR("Kumar Gala");
1190MODULE_DESCRIPTION("Simple Freescale SPI Driver");
1191MODULE_LICENSE("GPL");