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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{
254 struct mpc8xxx_spi *mpc8xxx_spi = spi_controller_get_devdata(spi->controller);
255 struct fsl_spi_reg __iomem *reg_base;
256 unsigned int len = t->len;
257 u8 bits_per_word;
258 int ret;
259
260 reg_base = mpc8xxx_spi->reg_base;
261 bits_per_word = spi->bits_per_word;
262 if (t->bits_per_word)
263 bits_per_word = t->bits_per_word;
264
265 if (bits_per_word > 8)
266 len /= 2;
267 if (bits_per_word > 16)
268 len /= 2;
269
270 mpc8xxx_spi->tx = t->tx_buf;
271 mpc8xxx_spi->rx = t->rx_buf;
272
273 reinit_completion(&mpc8xxx_spi->done);
274
275 if (mpc8xxx_spi->flags & SPI_CPM_MODE)
276 ret = fsl_spi_cpm_bufs(mpc8xxx_spi, t);
277 else
278 ret = fsl_spi_cpu_bufs(mpc8xxx_spi, t, len);
279 if (ret)
280 return ret;
281
282 wait_for_completion(&mpc8xxx_spi->done);
283
284 /* disable rx ints */
285 mpc8xxx_spi_write_reg(®_base->mask, 0);
286
287 if (mpc8xxx_spi->flags & SPI_CPM_MODE)
288 fsl_spi_cpm_bufs_complete(mpc8xxx_spi);
289
290 return mpc8xxx_spi->count;
291}
292
293static int fsl_spi_prepare_message(struct spi_controller *ctlr,
294 struct spi_message *m)
295{
296 struct mpc8xxx_spi *mpc8xxx_spi = spi_controller_get_devdata(ctlr);
297 struct spi_transfer *t;
298 struct spi_transfer *first;
299
300 first = list_first_entry(&m->transfers, struct spi_transfer,
301 transfer_list);
302
303 /*
304 * In CPU mode, optimize large byte transfers to use larger
305 * bits_per_word values to reduce number of interrupts taken.
306 *
307 * Some glitches can appear on the SPI clock when the mode changes.
308 * Check that there is no speed change during the transfer and set it up
309 * now to change the mode without having a chip-select asserted.
310 */
311 list_for_each_entry(t, &m->transfers, transfer_list) {
312 if (t->speed_hz != first->speed_hz) {
313 dev_err(&m->spi->dev,
314 "speed_hz cannot change during message.\n");
315 return -EINVAL;
316 }
317 if (!(mpc8xxx_spi->flags & SPI_CPM_MODE)) {
318 if (t->len < 256 || t->bits_per_word != 8)
319 continue;
320 if ((t->len & 3) == 0)
321 t->bits_per_word = 32;
322 else if ((t->len & 1) == 0)
323 t->bits_per_word = 16;
324 } else {
325 /*
326 * CPM/QE uses Little Endian for words > 8
327 * so transform 16 and 32 bits words into 8 bits
328 * Unfortnatly that doesn't work for LSB so
329 * reject these for now
330 * Note: 32 bits word, LSB works iff
331 * tfcr/rfcr is set to CPMFCR_GBL
332 */
333 if (m->spi->mode & SPI_LSB_FIRST && t->bits_per_word > 8)
334 return -EINVAL;
335 if (t->bits_per_word == 16 || t->bits_per_word == 32)
336 t->bits_per_word = 8; /* pretend its 8 bits */
337 if (t->bits_per_word == 8 && t->len >= 256 &&
338 (mpc8xxx_spi->flags & SPI_CPM1))
339 t->bits_per_word = 16;
340 }
341 }
342 return fsl_spi_setup_transfer(m->spi, first);
343}
344
345static int fsl_spi_transfer_one(struct spi_controller *controller,
346 struct spi_device *spi,
347 struct spi_transfer *t)
348{
349 int status;
350
351 status = fsl_spi_setup_transfer(spi, t);
352 if (status < 0)
353 return status;
354 if (t->len)
355 status = fsl_spi_bufs(spi, t);
356 if (status > 0)
357 return -EMSGSIZE;
358
359 return status;
360}
361
362static int fsl_spi_unprepare_message(struct spi_controller *controller,
363 struct spi_message *msg)
364{
365 return fsl_spi_setup_transfer(msg->spi, NULL);
366}
367
368static int fsl_spi_setup(struct spi_device *spi)
369{
370 struct mpc8xxx_spi *mpc8xxx_spi;
371 struct fsl_spi_reg __iomem *reg_base;
372 bool initial_setup = false;
373 int retval;
374 u32 hw_mode;
375 struct spi_mpc8xxx_cs *cs = spi_get_ctldata(spi);
376
377 if (!spi->max_speed_hz)
378 return -EINVAL;
379
380 if (!cs) {
381 cs = kzalloc(sizeof(*cs), GFP_KERNEL);
382 if (!cs)
383 return -ENOMEM;
384 spi_set_ctldata(spi, cs);
385 initial_setup = true;
386 }
387 mpc8xxx_spi = spi_controller_get_devdata(spi->controller);
388
389 reg_base = mpc8xxx_spi->reg_base;
390
391 hw_mode = cs->hw_mode; /* Save original settings */
392 cs->hw_mode = mpc8xxx_spi_read_reg(®_base->mode);
393 /* mask out bits we are going to set */
394 cs->hw_mode &= ~(SPMODE_CP_BEGIN_EDGECLK | SPMODE_CI_INACTIVEHIGH
395 | SPMODE_REV | SPMODE_LOOP);
396
397 if (spi->mode & SPI_CPHA)
398 cs->hw_mode |= SPMODE_CP_BEGIN_EDGECLK;
399 if (spi->mode & SPI_CPOL)
400 cs->hw_mode |= SPMODE_CI_INACTIVEHIGH;
401 if (!(spi->mode & SPI_LSB_FIRST))
402 cs->hw_mode |= SPMODE_REV;
403 if (spi->mode & SPI_LOOP)
404 cs->hw_mode |= SPMODE_LOOP;
405
406 retval = fsl_spi_setup_transfer(spi, NULL);
407 if (retval < 0) {
408 cs->hw_mode = hw_mode; /* Restore settings */
409 if (initial_setup)
410 kfree(cs);
411 return retval;
412 }
413
414 return 0;
415}
416
417static void fsl_spi_cleanup(struct spi_device *spi)
418{
419 struct spi_mpc8xxx_cs *cs = spi_get_ctldata(spi);
420
421 kfree(cs);
422 spi_set_ctldata(spi, NULL);
423}
424
425static void fsl_spi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events)
426{
427 struct fsl_spi_reg __iomem *reg_base = mspi->reg_base;
428
429 /* We need handle RX first */
430 if (events & SPIE_NE) {
431 u32 rx_data = mpc8xxx_spi_read_reg(®_base->receive);
432
433 if (mspi->rx)
434 mspi->get_rx(rx_data, mspi);
435 }
436
437 if ((events & SPIE_NF) == 0)
438 /* spin until TX is done */
439 while (((events =
440 mpc8xxx_spi_read_reg(®_base->event)) &
441 SPIE_NF) == 0)
442 cpu_relax();
443
444 /* Clear the events */
445 mpc8xxx_spi_write_reg(®_base->event, events);
446
447 mspi->count -= 1;
448 if (mspi->count) {
449 u32 word = mspi->get_tx(mspi);
450
451 mpc8xxx_spi_write_reg(®_base->transmit, word);
452 } else {
453 complete(&mspi->done);
454 }
455}
456
457static irqreturn_t fsl_spi_irq(s32 irq, void *context_data)
458{
459 struct mpc8xxx_spi *mspi = context_data;
460 irqreturn_t ret = IRQ_NONE;
461 u32 events;
462 struct fsl_spi_reg __iomem *reg_base = mspi->reg_base;
463
464 /* Get interrupt events(tx/rx) */
465 events = mpc8xxx_spi_read_reg(®_base->event);
466 if (events)
467 ret = IRQ_HANDLED;
468
469 dev_dbg(mspi->dev, "%s: events %x\n", __func__, events);
470
471 if (mspi->flags & SPI_CPM_MODE)
472 fsl_spi_cpm_irq(mspi, events);
473 else
474 fsl_spi_cpu_irq(mspi, events);
475
476 return ret;
477}
478
479static void fsl_spi_grlib_cs_control(struct spi_device *spi, bool on)
480{
481 struct mpc8xxx_spi *mpc8xxx_spi = spi_controller_get_devdata(spi->controller);
482 struct fsl_spi_reg __iomem *reg_base = mpc8xxx_spi->reg_base;
483 u32 slvsel;
484 u16 cs = spi_get_chipselect(spi, 0);
485
486 if (cs < mpc8xxx_spi->native_chipselects) {
487 slvsel = mpc8xxx_spi_read_reg(®_base->slvsel);
488 slvsel = on ? (slvsel | (1 << cs)) : (slvsel & ~(1 << cs));
489 mpc8xxx_spi_write_reg(®_base->slvsel, slvsel);
490 }
491}
492
493static void fsl_spi_grlib_probe(struct device *dev)
494{
495 struct spi_controller *host = dev_get_drvdata(dev);
496 struct mpc8xxx_spi *mpc8xxx_spi = spi_controller_get_devdata(host);
497 struct fsl_spi_reg __iomem *reg_base = mpc8xxx_spi->reg_base;
498 int mbits;
499 u32 capabilities;
500
501 capabilities = mpc8xxx_spi_read_reg(®_base->cap);
502
503 mpc8xxx_spi->set_shifts = fsl_spi_grlib_set_shifts;
504 mbits = SPCAP_MAXWLEN(capabilities);
505 if (mbits)
506 mpc8xxx_spi->max_bits_per_word = mbits + 1;
507
508 mpc8xxx_spi->native_chipselects = 0;
509 if (SPCAP_SSEN(capabilities)) {
510 mpc8xxx_spi->native_chipselects = SPCAP_SSSZ(capabilities);
511 mpc8xxx_spi_write_reg(®_base->slvsel, 0xffffffff);
512 }
513 host->num_chipselect = mpc8xxx_spi->native_chipselects;
514 host->set_cs = fsl_spi_grlib_cs_control;
515}
516
517static void fsl_spi_cs_control(struct spi_device *spi, bool on)
518{
519 struct device *dev = spi->dev.parent->parent;
520 struct fsl_spi_platform_data *pdata = dev_get_platdata(dev);
521 struct mpc8xxx_spi_probe_info *pinfo = to_of_pinfo(pdata);
522
523 if (WARN_ON_ONCE(!pinfo->immr_spi_cs))
524 return;
525 iowrite32be(on ? 0 : SPI_BOOT_SEL_BIT, pinfo->immr_spi_cs);
526}
527
528static struct spi_controller *fsl_spi_probe(struct device *dev,
529 struct resource *mem, unsigned int irq)
530{
531 struct fsl_spi_platform_data *pdata = dev_get_platdata(dev);
532 struct spi_controller *host;
533 struct mpc8xxx_spi *mpc8xxx_spi;
534 struct fsl_spi_reg __iomem *reg_base;
535 u32 regval;
536 int ret = 0;
537
538 host = spi_alloc_host(dev, sizeof(struct mpc8xxx_spi));
539 if (host == NULL) {
540 ret = -ENOMEM;
541 goto err;
542 }
543
544 dev_set_drvdata(dev, host);
545
546 mpc8xxx_spi_probe(dev, mem, irq);
547
548 host->setup = fsl_spi_setup;
549 host->cleanup = fsl_spi_cleanup;
550 host->prepare_message = fsl_spi_prepare_message;
551 host->transfer_one = fsl_spi_transfer_one;
552 host->unprepare_message = fsl_spi_unprepare_message;
553 host->use_gpio_descriptors = true;
554 host->set_cs = fsl_spi_cs_control;
555
556 mpc8xxx_spi = spi_controller_get_devdata(host);
557 mpc8xxx_spi->max_bits_per_word = 32;
558 mpc8xxx_spi->type = fsl_spi_get_type(dev);
559
560 ret = fsl_spi_cpm_init(mpc8xxx_spi);
561 if (ret)
562 goto err_cpm_init;
563
564 mpc8xxx_spi->reg_base = devm_ioremap_resource(dev, mem);
565 if (IS_ERR(mpc8xxx_spi->reg_base)) {
566 ret = PTR_ERR(mpc8xxx_spi->reg_base);
567 goto err_probe;
568 }
569
570 if (mpc8xxx_spi->type == TYPE_GRLIB)
571 fsl_spi_grlib_probe(dev);
572
573 if (mpc8xxx_spi->flags & SPI_CPM_MODE)
574 host->bits_per_word_mask =
575 (SPI_BPW_RANGE_MASK(4, 8) | SPI_BPW_MASK(16) | SPI_BPW_MASK(32));
576 else
577 host->bits_per_word_mask =
578 (SPI_BPW_RANGE_MASK(4, 16) | SPI_BPW_MASK(32));
579
580 host->bits_per_word_mask &=
581 SPI_BPW_RANGE_MASK(1, mpc8xxx_spi->max_bits_per_word);
582
583 if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE)
584 mpc8xxx_spi->set_shifts = fsl_spi_qe_cpu_set_shifts;
585
586 if (mpc8xxx_spi->set_shifts)
587 /* 8 bits per word and MSB first */
588 mpc8xxx_spi->set_shifts(&mpc8xxx_spi->rx_shift,
589 &mpc8xxx_spi->tx_shift, 8, 1);
590
591 /* Register for SPI Interrupt */
592 ret = devm_request_irq(dev, mpc8xxx_spi->irq, fsl_spi_irq,
593 0, "fsl_spi", mpc8xxx_spi);
594
595 if (ret != 0)
596 goto err_probe;
597
598 reg_base = mpc8xxx_spi->reg_base;
599
600 /* SPI controller initializations */
601 mpc8xxx_spi_write_reg(®_base->mode, 0);
602 mpc8xxx_spi_write_reg(®_base->mask, 0);
603 mpc8xxx_spi_write_reg(®_base->command, 0);
604 mpc8xxx_spi_write_reg(®_base->event, 0xffffffff);
605
606 /* Enable SPI interface */
607 regval = pdata->initial_spmode | SPMODE_INIT_VAL | SPMODE_ENABLE;
608 if (mpc8xxx_spi->max_bits_per_word < 8) {
609 regval &= ~SPMODE_LEN(0xF);
610 regval |= SPMODE_LEN(mpc8xxx_spi->max_bits_per_word - 1);
611 }
612 if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE)
613 regval |= SPMODE_OP;
614
615 mpc8xxx_spi_write_reg(®_base->mode, regval);
616
617 ret = devm_spi_register_controller(dev, host);
618 if (ret < 0)
619 goto err_probe;
620
621 dev_info(dev, "at 0x%p (irq = %d), %s mode\n", reg_base,
622 mpc8xxx_spi->irq, mpc8xxx_spi_strmode(mpc8xxx_spi->flags));
623
624 return host;
625
626err_probe:
627 fsl_spi_cpm_free(mpc8xxx_spi);
628err_cpm_init:
629 spi_controller_put(host);
630err:
631 return ERR_PTR(ret);
632}
633
634static int of_fsl_spi_probe(struct platform_device *ofdev)
635{
636 struct device *dev = &ofdev->dev;
637 struct device_node *np = ofdev->dev.of_node;
638 struct spi_controller *host;
639 struct resource mem;
640 int irq, type;
641 int ret;
642 bool spisel_boot = false;
643#if IS_ENABLED(CONFIG_FSL_SOC)
644 struct mpc8xxx_spi_probe_info *pinfo = NULL;
645#endif
646
647
648 ret = of_mpc8xxx_spi_probe(ofdev);
649 if (ret)
650 return ret;
651
652 type = fsl_spi_get_type(&ofdev->dev);
653 if (type == TYPE_FSL) {
654 struct fsl_spi_platform_data *pdata = dev_get_platdata(dev);
655#if IS_ENABLED(CONFIG_FSL_SOC)
656 pinfo = to_of_pinfo(pdata);
657
658 spisel_boot = of_property_read_bool(np, "fsl,spisel_boot");
659 if (spisel_boot) {
660 pinfo->immr_spi_cs = ioremap(get_immrbase() + IMMR_SPI_CS_OFFSET, 4);
661 if (!pinfo->immr_spi_cs)
662 return -ENOMEM;
663 }
664#endif
665 /*
666 * Handle the case where we have one hardwired (always selected)
667 * device on the first "chipselect". Else we let the core code
668 * handle any GPIOs or native chip selects and assign the
669 * appropriate callback for dealing with the CS lines. This isn't
670 * supported on the GRLIB variant.
671 */
672 ret = gpiod_count(dev, "cs");
673 if (ret < 0)
674 ret = 0;
675 if (ret == 0 && !spisel_boot)
676 pdata->max_chipselect = 1;
677 else
678 pdata->max_chipselect = ret + spisel_boot;
679 }
680
681 ret = of_address_to_resource(np, 0, &mem);
682 if (ret)
683 goto unmap_out;
684
685 irq = platform_get_irq(ofdev, 0);
686 if (irq < 0) {
687 ret = irq;
688 goto unmap_out;
689 }
690
691 host = fsl_spi_probe(dev, &mem, irq);
692
693 return PTR_ERR_OR_ZERO(host);
694
695unmap_out:
696#if IS_ENABLED(CONFIG_FSL_SOC)
697 if (spisel_boot)
698 iounmap(pinfo->immr_spi_cs);
699#endif
700 return ret;
701}
702
703static void of_fsl_spi_remove(struct platform_device *ofdev)
704{
705 struct spi_controller *host = platform_get_drvdata(ofdev);
706 struct mpc8xxx_spi *mpc8xxx_spi = spi_controller_get_devdata(host);
707
708 fsl_spi_cpm_free(mpc8xxx_spi);
709}
710
711static struct platform_driver of_fsl_spi_driver = {
712 .driver = {
713 .name = "fsl_spi",
714 .of_match_table = of_fsl_spi_match,
715 },
716 .probe = of_fsl_spi_probe,
717 .remove = of_fsl_spi_remove,
718};
719
720#ifdef CONFIG_MPC832x_RDB
721/*
722 * XXX XXX XXX
723 * This is "legacy" platform driver, was used by the MPC8323E-RDB boards
724 * only. The driver should go away soon, since newer MPC8323E-RDB's device
725 * tree can work with OpenFirmware driver. But for now we support old trees
726 * as well.
727 */
728static int plat_mpc8xxx_spi_probe(struct platform_device *pdev)
729{
730 struct resource *mem;
731 int irq;
732 struct spi_controller *host;
733
734 if (!dev_get_platdata(&pdev->dev))
735 return -EINVAL;
736
737 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
738 if (!mem)
739 return -EINVAL;
740
741 irq = platform_get_irq(pdev, 0);
742 if (irq < 0)
743 return irq;
744
745 host = fsl_spi_probe(&pdev->dev, mem, irq);
746 return PTR_ERR_OR_ZERO(host);
747}
748
749static void plat_mpc8xxx_spi_remove(struct platform_device *pdev)
750{
751 struct spi_controller *host = platform_get_drvdata(pdev);
752 struct mpc8xxx_spi *mpc8xxx_spi = spi_controller_get_devdata(host);
753
754 fsl_spi_cpm_free(mpc8xxx_spi);
755}
756
757MODULE_ALIAS("platform:mpc8xxx_spi");
758static struct platform_driver mpc8xxx_spi_driver = {
759 .probe = plat_mpc8xxx_spi_probe,
760 .remove = plat_mpc8xxx_spi_remove,
761 .driver = {
762 .name = "mpc8xxx_spi",
763 },
764};
765
766static bool legacy_driver_failed;
767
768static void __init legacy_driver_register(void)
769{
770 legacy_driver_failed = platform_driver_register(&mpc8xxx_spi_driver);
771}
772
773static void __exit legacy_driver_unregister(void)
774{
775 if (legacy_driver_failed)
776 return;
777 platform_driver_unregister(&mpc8xxx_spi_driver);
778}
779#else
780static void __init legacy_driver_register(void) {}
781static void __exit legacy_driver_unregister(void) {}
782#endif /* CONFIG_MPC832x_RDB */
783
784static int __init fsl_spi_init(void)
785{
786 legacy_driver_register();
787 return platform_driver_register(&of_fsl_spi_driver);
788}
789module_init(fsl_spi_init);
790
791static void __exit fsl_spi_exit(void)
792{
793 platform_driver_unregister(&of_fsl_spi_driver);
794 legacy_driver_unregister();
795}
796module_exit(fsl_spi_exit);
797
798MODULE_AUTHOR("Kumar Gala");
799MODULE_DESCRIPTION("Simple Freescale SPI Driver");
800MODULE_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 * GRLIB support:
14 * Copyright (c) 2012 Aeroflex Gaisler AB.
15 * Author: Andreas Larsson <andreas@gaisler.com>
16 *
17 * This program is free software; you can redistribute it and/or modify it
18 * under the terms of the GNU General Public License as published by the
19 * Free Software Foundation; either version 2 of the License, or (at your
20 * option) any later version.
21 */
22#include <linux/delay.h>
23#include <linux/dma-mapping.h>
24#include <linux/fsl_devices.h>
25#include <linux/gpio.h>
26#include <linux/interrupt.h>
27#include <linux/irq.h>
28#include <linux/kernel.h>
29#include <linux/mm.h>
30#include <linux/module.h>
31#include <linux/mutex.h>
32#include <linux/of.h>
33#include <linux/of_address.h>
34#include <linux/of_irq.h>
35#include <linux/of_gpio.h>
36#include <linux/of_platform.h>
37#include <linux/platform_device.h>
38#include <linux/spi/spi.h>
39#include <linux/spi/spi_bitbang.h>
40#include <linux/types.h>
41
42#include "spi-fsl-lib.h"
43#include "spi-fsl-cpm.h"
44#include "spi-fsl-spi.h"
45
46#define TYPE_FSL 0
47#define TYPE_GRLIB 1
48
49struct fsl_spi_match_data {
50 int type;
51};
52
53static struct fsl_spi_match_data of_fsl_spi_fsl_config = {
54 .type = TYPE_FSL,
55};
56
57static struct fsl_spi_match_data of_fsl_spi_grlib_config = {
58 .type = TYPE_GRLIB,
59};
60
61static const struct of_device_id of_fsl_spi_match[] = {
62 {
63 .compatible = "fsl,spi",
64 .data = &of_fsl_spi_fsl_config,
65 },
66 {
67 .compatible = "aeroflexgaisler,spictrl",
68 .data = &of_fsl_spi_grlib_config,
69 },
70 {}
71};
72MODULE_DEVICE_TABLE(of, of_fsl_spi_match);
73
74static int fsl_spi_get_type(struct device *dev)
75{
76 const struct of_device_id *match;
77
78 if (dev->of_node) {
79 match = of_match_node(of_fsl_spi_match, dev->of_node);
80 if (match && match->data)
81 return ((struct fsl_spi_match_data *)match->data)->type;
82 }
83 return TYPE_FSL;
84}
85
86static void fsl_spi_change_mode(struct spi_device *spi)
87{
88 struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
89 struct spi_mpc8xxx_cs *cs = spi->controller_state;
90 struct fsl_spi_reg *reg_base = mspi->reg_base;
91 __be32 __iomem *mode = ®_base->mode;
92 unsigned long flags;
93
94 if (cs->hw_mode == mpc8xxx_spi_read_reg(mode))
95 return;
96
97 /* Turn off IRQs locally to minimize time that SPI is disabled. */
98 local_irq_save(flags);
99
100 /* Turn off SPI unit prior changing mode */
101 mpc8xxx_spi_write_reg(mode, cs->hw_mode & ~SPMODE_ENABLE);
102
103 /* When in CPM mode, we need to reinit tx and rx. */
104 if (mspi->flags & SPI_CPM_MODE) {
105 fsl_spi_cpm_reinit_txrx(mspi);
106 }
107 mpc8xxx_spi_write_reg(mode, cs->hw_mode);
108 local_irq_restore(flags);
109}
110
111static void fsl_spi_chipselect(struct spi_device *spi, int value)
112{
113 struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master);
114 struct fsl_spi_platform_data *pdata;
115 bool pol = spi->mode & SPI_CS_HIGH;
116 struct spi_mpc8xxx_cs *cs = spi->controller_state;
117
118 pdata = spi->dev.parent->parent->platform_data;
119
120 if (value == BITBANG_CS_INACTIVE) {
121 if (pdata->cs_control)
122 pdata->cs_control(spi, !pol);
123 }
124
125 if (value == BITBANG_CS_ACTIVE) {
126 mpc8xxx_spi->rx_shift = cs->rx_shift;
127 mpc8xxx_spi->tx_shift = cs->tx_shift;
128 mpc8xxx_spi->get_rx = cs->get_rx;
129 mpc8xxx_spi->get_tx = cs->get_tx;
130
131 fsl_spi_change_mode(spi);
132
133 if (pdata->cs_control)
134 pdata->cs_control(spi, pol);
135 }
136}
137
138static void fsl_spi_qe_cpu_set_shifts(u32 *rx_shift, u32 *tx_shift,
139 int bits_per_word, int msb_first)
140{
141 *rx_shift = 0;
142 *tx_shift = 0;
143 if (msb_first) {
144 if (bits_per_word <= 8) {
145 *rx_shift = 16;
146 *tx_shift = 24;
147 } else if (bits_per_word <= 16) {
148 *rx_shift = 16;
149 *tx_shift = 16;
150 }
151 } else {
152 if (bits_per_word <= 8)
153 *rx_shift = 8;
154 }
155}
156
157static void fsl_spi_grlib_set_shifts(u32 *rx_shift, u32 *tx_shift,
158 int bits_per_word, int msb_first)
159{
160 *rx_shift = 0;
161 *tx_shift = 0;
162 if (bits_per_word <= 16) {
163 if (msb_first) {
164 *rx_shift = 16; /* LSB in bit 16 */
165 *tx_shift = 32 - bits_per_word; /* MSB in bit 31 */
166 } else {
167 *rx_shift = 16 - bits_per_word; /* MSB in bit 15 */
168 }
169 }
170}
171
172static int mspi_apply_cpu_mode_quirks(struct spi_mpc8xxx_cs *cs,
173 struct spi_device *spi,
174 struct mpc8xxx_spi *mpc8xxx_spi,
175 int bits_per_word)
176{
177 cs->rx_shift = 0;
178 cs->tx_shift = 0;
179 if (bits_per_word <= 8) {
180 cs->get_rx = mpc8xxx_spi_rx_buf_u8;
181 cs->get_tx = mpc8xxx_spi_tx_buf_u8;
182 } else if (bits_per_word <= 16) {
183 cs->get_rx = mpc8xxx_spi_rx_buf_u16;
184 cs->get_tx = mpc8xxx_spi_tx_buf_u16;
185 } else if (bits_per_word <= 32) {
186 cs->get_rx = mpc8xxx_spi_rx_buf_u32;
187 cs->get_tx = mpc8xxx_spi_tx_buf_u32;
188 } else
189 return -EINVAL;
190
191 if (mpc8xxx_spi->set_shifts)
192 mpc8xxx_spi->set_shifts(&cs->rx_shift, &cs->tx_shift,
193 bits_per_word,
194 !(spi->mode & SPI_LSB_FIRST));
195
196 mpc8xxx_spi->rx_shift = cs->rx_shift;
197 mpc8xxx_spi->tx_shift = cs->tx_shift;
198 mpc8xxx_spi->get_rx = cs->get_rx;
199 mpc8xxx_spi->get_tx = cs->get_tx;
200
201 return bits_per_word;
202}
203
204static int mspi_apply_qe_mode_quirks(struct spi_mpc8xxx_cs *cs,
205 struct spi_device *spi,
206 int bits_per_word)
207{
208 /* QE uses Little Endian for words > 8
209 * so transform all words > 8 into 8 bits
210 * Unfortnatly that doesn't work for LSB so
211 * reject these for now */
212 /* Note: 32 bits word, LSB works iff
213 * tfcr/rfcr is set to CPMFCR_GBL */
214 if (spi->mode & SPI_LSB_FIRST &&
215 bits_per_word > 8)
216 return -EINVAL;
217 if (bits_per_word > 8)
218 return 8; /* pretend its 8 bits */
219 return bits_per_word;
220}
221
222static int fsl_spi_setup_transfer(struct spi_device *spi,
223 struct spi_transfer *t)
224{
225 struct mpc8xxx_spi *mpc8xxx_spi;
226 int bits_per_word = 0;
227 u8 pm;
228 u32 hz = 0;
229 struct spi_mpc8xxx_cs *cs = spi->controller_state;
230
231 mpc8xxx_spi = spi_master_get_devdata(spi->master);
232
233 if (t) {
234 bits_per_word = t->bits_per_word;
235 hz = t->speed_hz;
236 }
237
238 /* spi_transfer level calls that work per-word */
239 if (!bits_per_word)
240 bits_per_word = spi->bits_per_word;
241
242 if (!hz)
243 hz = spi->max_speed_hz;
244
245 if (!(mpc8xxx_spi->flags & SPI_CPM_MODE))
246 bits_per_word = mspi_apply_cpu_mode_quirks(cs, spi,
247 mpc8xxx_spi,
248 bits_per_word);
249 else if (mpc8xxx_spi->flags & SPI_QE)
250 bits_per_word = mspi_apply_qe_mode_quirks(cs, spi,
251 bits_per_word);
252
253 if (bits_per_word < 0)
254 return bits_per_word;
255
256 if (bits_per_word == 32)
257 bits_per_word = 0;
258 else
259 bits_per_word = bits_per_word - 1;
260
261 /* mask out bits we are going to set */
262 cs->hw_mode &= ~(SPMODE_LEN(0xF) | SPMODE_DIV16
263 | SPMODE_PM(0xF));
264
265 cs->hw_mode |= SPMODE_LEN(bits_per_word);
266
267 if ((mpc8xxx_spi->spibrg / hz) > 64) {
268 cs->hw_mode |= SPMODE_DIV16;
269 pm = (mpc8xxx_spi->spibrg - 1) / (hz * 64) + 1;
270 WARN_ONCE(pm > 16,
271 "%s: Requested speed is too low: %d Hz. Will use %d Hz instead.\n",
272 dev_name(&spi->dev), hz, mpc8xxx_spi->spibrg / 1024);
273 if (pm > 16)
274 pm = 16;
275 } else {
276 pm = (mpc8xxx_spi->spibrg - 1) / (hz * 4) + 1;
277 }
278 if (pm)
279 pm--;
280
281 cs->hw_mode |= SPMODE_PM(pm);
282
283 fsl_spi_change_mode(spi);
284 return 0;
285}
286
287static int fsl_spi_cpu_bufs(struct mpc8xxx_spi *mspi,
288 struct spi_transfer *t, unsigned int len)
289{
290 u32 word;
291 struct fsl_spi_reg *reg_base = mspi->reg_base;
292
293 mspi->count = len;
294
295 /* enable rx ints */
296 mpc8xxx_spi_write_reg(®_base->mask, SPIM_NE);
297
298 /* transmit word */
299 word = mspi->get_tx(mspi);
300 mpc8xxx_spi_write_reg(®_base->transmit, word);
301
302 return 0;
303}
304
305static int fsl_spi_bufs(struct spi_device *spi, struct spi_transfer *t,
306 bool is_dma_mapped)
307{
308 struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master);
309 struct fsl_spi_reg *reg_base;
310 unsigned int len = t->len;
311 u8 bits_per_word;
312 int ret;
313
314 reg_base = mpc8xxx_spi->reg_base;
315 bits_per_word = spi->bits_per_word;
316 if (t->bits_per_word)
317 bits_per_word = t->bits_per_word;
318
319 if (bits_per_word > 8) {
320 /* invalid length? */
321 if (len & 1)
322 return -EINVAL;
323 len /= 2;
324 }
325 if (bits_per_word > 16) {
326 /* invalid length? */
327 if (len & 1)
328 return -EINVAL;
329 len /= 2;
330 }
331
332 mpc8xxx_spi->tx = t->tx_buf;
333 mpc8xxx_spi->rx = t->rx_buf;
334
335 reinit_completion(&mpc8xxx_spi->done);
336
337 if (mpc8xxx_spi->flags & SPI_CPM_MODE)
338 ret = fsl_spi_cpm_bufs(mpc8xxx_spi, t, is_dma_mapped);
339 else
340 ret = fsl_spi_cpu_bufs(mpc8xxx_spi, t, len);
341 if (ret)
342 return ret;
343
344 wait_for_completion(&mpc8xxx_spi->done);
345
346 /* disable rx ints */
347 mpc8xxx_spi_write_reg(®_base->mask, 0);
348
349 if (mpc8xxx_spi->flags & SPI_CPM_MODE)
350 fsl_spi_cpm_bufs_complete(mpc8xxx_spi);
351
352 return mpc8xxx_spi->count;
353}
354
355static int fsl_spi_do_one_msg(struct spi_master *master,
356 struct spi_message *m)
357{
358 struct spi_device *spi = m->spi;
359 struct spi_transfer *t, *first;
360 unsigned int cs_change;
361 const int nsecs = 50;
362 int status;
363
364 /* Don't allow changes if CS is active */
365 first = list_first_entry(&m->transfers, struct spi_transfer,
366 transfer_list);
367 list_for_each_entry(t, &m->transfers, transfer_list) {
368 if ((first->bits_per_word != t->bits_per_word) ||
369 (first->speed_hz != t->speed_hz)) {
370 dev_err(&spi->dev,
371 "bits_per_word/speed_hz should be same for the same SPI transfer\n");
372 return -EINVAL;
373 }
374 }
375
376 cs_change = 1;
377 status = -EINVAL;
378 list_for_each_entry(t, &m->transfers, transfer_list) {
379 if (t->bits_per_word || t->speed_hz) {
380 if (cs_change)
381 status = fsl_spi_setup_transfer(spi, t);
382 if (status < 0)
383 break;
384 }
385
386 if (cs_change) {
387 fsl_spi_chipselect(spi, BITBANG_CS_ACTIVE);
388 ndelay(nsecs);
389 }
390 cs_change = t->cs_change;
391 if (t->len)
392 status = fsl_spi_bufs(spi, t, m->is_dma_mapped);
393 if (status) {
394 status = -EMSGSIZE;
395 break;
396 }
397 m->actual_length += t->len;
398
399 if (t->delay_usecs)
400 udelay(t->delay_usecs);
401
402 if (cs_change) {
403 ndelay(nsecs);
404 fsl_spi_chipselect(spi, BITBANG_CS_INACTIVE);
405 ndelay(nsecs);
406 }
407 }
408
409 m->status = status;
410 spi_finalize_current_message(master);
411
412 if (status || !cs_change) {
413 ndelay(nsecs);
414 fsl_spi_chipselect(spi, BITBANG_CS_INACTIVE);
415 }
416
417 fsl_spi_setup_transfer(spi, NULL);
418 return 0;
419}
420
421static int fsl_spi_setup(struct spi_device *spi)
422{
423 struct mpc8xxx_spi *mpc8xxx_spi;
424 struct fsl_spi_reg *reg_base;
425 int retval;
426 u32 hw_mode;
427 struct spi_mpc8xxx_cs *cs = spi_get_ctldata(spi);
428
429 if (!spi->max_speed_hz)
430 return -EINVAL;
431
432 if (!cs) {
433 cs = kzalloc(sizeof(*cs), GFP_KERNEL);
434 if (!cs)
435 return -ENOMEM;
436 spi_set_ctldata(spi, cs);
437 }
438 mpc8xxx_spi = spi_master_get_devdata(spi->master);
439
440 reg_base = mpc8xxx_spi->reg_base;
441
442 hw_mode = cs->hw_mode; /* Save original settings */
443 cs->hw_mode = mpc8xxx_spi_read_reg(®_base->mode);
444 /* mask out bits we are going to set */
445 cs->hw_mode &= ~(SPMODE_CP_BEGIN_EDGECLK | SPMODE_CI_INACTIVEHIGH
446 | SPMODE_REV | SPMODE_LOOP);
447
448 if (spi->mode & SPI_CPHA)
449 cs->hw_mode |= SPMODE_CP_BEGIN_EDGECLK;
450 if (spi->mode & SPI_CPOL)
451 cs->hw_mode |= SPMODE_CI_INACTIVEHIGH;
452 if (!(spi->mode & SPI_LSB_FIRST))
453 cs->hw_mode |= SPMODE_REV;
454 if (spi->mode & SPI_LOOP)
455 cs->hw_mode |= SPMODE_LOOP;
456
457 retval = fsl_spi_setup_transfer(spi, NULL);
458 if (retval < 0) {
459 cs->hw_mode = hw_mode; /* Restore settings */
460 return retval;
461 }
462
463 if (mpc8xxx_spi->type == TYPE_GRLIB) {
464 if (gpio_is_valid(spi->cs_gpio)) {
465 int desel;
466
467 retval = gpio_request(spi->cs_gpio,
468 dev_name(&spi->dev));
469 if (retval)
470 return retval;
471
472 desel = !(spi->mode & SPI_CS_HIGH);
473 retval = gpio_direction_output(spi->cs_gpio, desel);
474 if (retval) {
475 gpio_free(spi->cs_gpio);
476 return retval;
477 }
478 } else if (spi->cs_gpio != -ENOENT) {
479 if (spi->cs_gpio < 0)
480 return spi->cs_gpio;
481 return -EINVAL;
482 }
483 /* When spi->cs_gpio == -ENOENT, a hole in the phandle list
484 * indicates to use native chipselect if present, or allow for
485 * an always selected chip
486 */
487 }
488
489 /* Initialize chipselect - might be active for SPI_CS_HIGH mode */
490 fsl_spi_chipselect(spi, BITBANG_CS_INACTIVE);
491
492 return 0;
493}
494
495static void fsl_spi_cleanup(struct spi_device *spi)
496{
497 struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master);
498 struct spi_mpc8xxx_cs *cs = spi_get_ctldata(spi);
499
500 if (mpc8xxx_spi->type == TYPE_GRLIB && gpio_is_valid(spi->cs_gpio))
501 gpio_free(spi->cs_gpio);
502
503 kfree(cs);
504 spi_set_ctldata(spi, NULL);
505}
506
507static void fsl_spi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events)
508{
509 struct fsl_spi_reg *reg_base = mspi->reg_base;
510
511 /* We need handle RX first */
512 if (events & SPIE_NE) {
513 u32 rx_data = mpc8xxx_spi_read_reg(®_base->receive);
514
515 if (mspi->rx)
516 mspi->get_rx(rx_data, mspi);
517 }
518
519 if ((events & SPIE_NF) == 0)
520 /* spin until TX is done */
521 while (((events =
522 mpc8xxx_spi_read_reg(®_base->event)) &
523 SPIE_NF) == 0)
524 cpu_relax();
525
526 /* Clear the events */
527 mpc8xxx_spi_write_reg(®_base->event, events);
528
529 mspi->count -= 1;
530 if (mspi->count) {
531 u32 word = mspi->get_tx(mspi);
532
533 mpc8xxx_spi_write_reg(®_base->transmit, word);
534 } else {
535 complete(&mspi->done);
536 }
537}
538
539static irqreturn_t fsl_spi_irq(s32 irq, void *context_data)
540{
541 struct mpc8xxx_spi *mspi = context_data;
542 irqreturn_t ret = IRQ_NONE;
543 u32 events;
544 struct fsl_spi_reg *reg_base = mspi->reg_base;
545
546 /* Get interrupt events(tx/rx) */
547 events = mpc8xxx_spi_read_reg(®_base->event);
548 if (events)
549 ret = IRQ_HANDLED;
550
551 dev_dbg(mspi->dev, "%s: events %x\n", __func__, events);
552
553 if (mspi->flags & SPI_CPM_MODE)
554 fsl_spi_cpm_irq(mspi, events);
555 else
556 fsl_spi_cpu_irq(mspi, events);
557
558 return ret;
559}
560
561static void fsl_spi_grlib_cs_control(struct spi_device *spi, bool on)
562{
563 struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master);
564 struct fsl_spi_reg *reg_base = mpc8xxx_spi->reg_base;
565 u32 slvsel;
566 u16 cs = spi->chip_select;
567
568 if (gpio_is_valid(spi->cs_gpio)) {
569 gpio_set_value(spi->cs_gpio, on);
570 } else if (cs < mpc8xxx_spi->native_chipselects) {
571 slvsel = mpc8xxx_spi_read_reg(®_base->slvsel);
572 slvsel = on ? (slvsel | (1 << cs)) : (slvsel & ~(1 << cs));
573 mpc8xxx_spi_write_reg(®_base->slvsel, slvsel);
574 }
575}
576
577static void fsl_spi_grlib_probe(struct device *dev)
578{
579 struct fsl_spi_platform_data *pdata = dev_get_platdata(dev);
580 struct spi_master *master = dev_get_drvdata(dev);
581 struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(master);
582 struct fsl_spi_reg *reg_base = mpc8xxx_spi->reg_base;
583 int mbits;
584 u32 capabilities;
585
586 capabilities = mpc8xxx_spi_read_reg(®_base->cap);
587
588 mpc8xxx_spi->set_shifts = fsl_spi_grlib_set_shifts;
589 mbits = SPCAP_MAXWLEN(capabilities);
590 if (mbits)
591 mpc8xxx_spi->max_bits_per_word = mbits + 1;
592
593 mpc8xxx_spi->native_chipselects = 0;
594 if (SPCAP_SSEN(capabilities)) {
595 mpc8xxx_spi->native_chipselects = SPCAP_SSSZ(capabilities);
596 mpc8xxx_spi_write_reg(®_base->slvsel, 0xffffffff);
597 }
598 master->num_chipselect = mpc8xxx_spi->native_chipselects;
599 pdata->cs_control = fsl_spi_grlib_cs_control;
600}
601
602static struct spi_master * fsl_spi_probe(struct device *dev,
603 struct resource *mem, unsigned int irq)
604{
605 struct fsl_spi_platform_data *pdata = dev_get_platdata(dev);
606 struct spi_master *master;
607 struct mpc8xxx_spi *mpc8xxx_spi;
608 struct fsl_spi_reg *reg_base;
609 u32 regval;
610 int ret = 0;
611
612 master = spi_alloc_master(dev, sizeof(struct mpc8xxx_spi));
613 if (master == NULL) {
614 ret = -ENOMEM;
615 goto err;
616 }
617
618 dev_set_drvdata(dev, master);
619
620 mpc8xxx_spi_probe(dev, mem, irq);
621
622 master->setup = fsl_spi_setup;
623 master->cleanup = fsl_spi_cleanup;
624 master->transfer_one_message = fsl_spi_do_one_msg;
625
626 mpc8xxx_spi = spi_master_get_devdata(master);
627 mpc8xxx_spi->max_bits_per_word = 32;
628 mpc8xxx_spi->type = fsl_spi_get_type(dev);
629
630 ret = fsl_spi_cpm_init(mpc8xxx_spi);
631 if (ret)
632 goto err_cpm_init;
633
634 mpc8xxx_spi->reg_base = devm_ioremap_resource(dev, mem);
635 if (IS_ERR(mpc8xxx_spi->reg_base)) {
636 ret = PTR_ERR(mpc8xxx_spi->reg_base);
637 goto err_probe;
638 }
639
640 if (mpc8xxx_spi->type == TYPE_GRLIB)
641 fsl_spi_grlib_probe(dev);
642
643 master->bits_per_word_mask =
644 (SPI_BPW_RANGE_MASK(4, 16) | SPI_BPW_MASK(32)) &
645 SPI_BPW_RANGE_MASK(1, mpc8xxx_spi->max_bits_per_word);
646
647 if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE)
648 mpc8xxx_spi->set_shifts = fsl_spi_qe_cpu_set_shifts;
649
650 if (mpc8xxx_spi->set_shifts)
651 /* 8 bits per word and MSB first */
652 mpc8xxx_spi->set_shifts(&mpc8xxx_spi->rx_shift,
653 &mpc8xxx_spi->tx_shift, 8, 1);
654
655 /* Register for SPI Interrupt */
656 ret = devm_request_irq(dev, mpc8xxx_spi->irq, fsl_spi_irq,
657 0, "fsl_spi", mpc8xxx_spi);
658
659 if (ret != 0)
660 goto err_probe;
661
662 reg_base = mpc8xxx_spi->reg_base;
663
664 /* SPI controller initializations */
665 mpc8xxx_spi_write_reg(®_base->mode, 0);
666 mpc8xxx_spi_write_reg(®_base->mask, 0);
667 mpc8xxx_spi_write_reg(®_base->command, 0);
668 mpc8xxx_spi_write_reg(®_base->event, 0xffffffff);
669
670 /* Enable SPI interface */
671 regval = pdata->initial_spmode | SPMODE_INIT_VAL | SPMODE_ENABLE;
672 if (mpc8xxx_spi->max_bits_per_word < 8) {
673 regval &= ~SPMODE_LEN(0xF);
674 regval |= SPMODE_LEN(mpc8xxx_spi->max_bits_per_word - 1);
675 }
676 if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE)
677 regval |= SPMODE_OP;
678
679 mpc8xxx_spi_write_reg(®_base->mode, regval);
680
681 ret = devm_spi_register_master(dev, master);
682 if (ret < 0)
683 goto err_probe;
684
685 dev_info(dev, "at 0x%p (irq = %d), %s mode\n", reg_base,
686 mpc8xxx_spi->irq, mpc8xxx_spi_strmode(mpc8xxx_spi->flags));
687
688 return master;
689
690err_probe:
691 fsl_spi_cpm_free(mpc8xxx_spi);
692err_cpm_init:
693 spi_master_put(master);
694err:
695 return ERR_PTR(ret);
696}
697
698static void fsl_spi_cs_control(struct spi_device *spi, bool on)
699{
700 struct device *dev = spi->dev.parent->parent;
701 struct fsl_spi_platform_data *pdata = dev_get_platdata(dev);
702 struct mpc8xxx_spi_probe_info *pinfo = to_of_pinfo(pdata);
703 u16 cs = spi->chip_select;
704 int gpio = pinfo->gpios[cs];
705 bool alow = pinfo->alow_flags[cs];
706
707 gpio_set_value(gpio, on ^ alow);
708}
709
710static int of_fsl_spi_get_chipselects(struct device *dev)
711{
712 struct device_node *np = dev->of_node;
713 struct fsl_spi_platform_data *pdata = dev_get_platdata(dev);
714 struct mpc8xxx_spi_probe_info *pinfo = to_of_pinfo(pdata);
715 int ngpios;
716 int i = 0;
717 int ret;
718
719 ngpios = of_gpio_count(np);
720 if (ngpios <= 0) {
721 /*
722 * SPI w/o chip-select line. One SPI device is still permitted
723 * though.
724 */
725 pdata->max_chipselect = 1;
726 return 0;
727 }
728
729 pinfo->gpios = kmalloc_array(ngpios, sizeof(*pinfo->gpios),
730 GFP_KERNEL);
731 if (!pinfo->gpios)
732 return -ENOMEM;
733 memset(pinfo->gpios, -1, ngpios * sizeof(*pinfo->gpios));
734
735 pinfo->alow_flags = kcalloc(ngpios, sizeof(*pinfo->alow_flags),
736 GFP_KERNEL);
737 if (!pinfo->alow_flags) {
738 ret = -ENOMEM;
739 goto err_alloc_flags;
740 }
741
742 for (; i < ngpios; i++) {
743 int gpio;
744 enum of_gpio_flags flags;
745
746 gpio = of_get_gpio_flags(np, i, &flags);
747 if (!gpio_is_valid(gpio)) {
748 dev_err(dev, "invalid gpio #%d: %d\n", i, gpio);
749 ret = gpio;
750 goto err_loop;
751 }
752
753 ret = gpio_request(gpio, dev_name(dev));
754 if (ret) {
755 dev_err(dev, "can't request gpio #%d: %d\n", i, ret);
756 goto err_loop;
757 }
758
759 pinfo->gpios[i] = gpio;
760 pinfo->alow_flags[i] = flags & OF_GPIO_ACTIVE_LOW;
761
762 ret = gpio_direction_output(pinfo->gpios[i],
763 pinfo->alow_flags[i]);
764 if (ret) {
765 dev_err(dev,
766 "can't set output direction for gpio #%d: %d\n",
767 i, ret);
768 goto err_loop;
769 }
770 }
771
772 pdata->max_chipselect = ngpios;
773 pdata->cs_control = fsl_spi_cs_control;
774
775 return 0;
776
777err_loop:
778 while (i >= 0) {
779 if (gpio_is_valid(pinfo->gpios[i]))
780 gpio_free(pinfo->gpios[i]);
781 i--;
782 }
783
784 kfree(pinfo->alow_flags);
785 pinfo->alow_flags = NULL;
786err_alloc_flags:
787 kfree(pinfo->gpios);
788 pinfo->gpios = NULL;
789 return ret;
790}
791
792static int of_fsl_spi_free_chipselects(struct device *dev)
793{
794 struct fsl_spi_platform_data *pdata = dev_get_platdata(dev);
795 struct mpc8xxx_spi_probe_info *pinfo = to_of_pinfo(pdata);
796 int i;
797
798 if (!pinfo->gpios)
799 return 0;
800
801 for (i = 0; i < pdata->max_chipselect; i++) {
802 if (gpio_is_valid(pinfo->gpios[i]))
803 gpio_free(pinfo->gpios[i]);
804 }
805
806 kfree(pinfo->gpios);
807 kfree(pinfo->alow_flags);
808 return 0;
809}
810
811static int of_fsl_spi_probe(struct platform_device *ofdev)
812{
813 struct device *dev = &ofdev->dev;
814 struct device_node *np = ofdev->dev.of_node;
815 struct spi_master *master;
816 struct resource mem;
817 int irq = 0, type;
818 int ret = -ENOMEM;
819
820 ret = of_mpc8xxx_spi_probe(ofdev);
821 if (ret)
822 return ret;
823
824 type = fsl_spi_get_type(&ofdev->dev);
825 if (type == TYPE_FSL) {
826 ret = of_fsl_spi_get_chipselects(dev);
827 if (ret)
828 goto err;
829 }
830
831 ret = of_address_to_resource(np, 0, &mem);
832 if (ret)
833 goto err;
834
835 irq = irq_of_parse_and_map(np, 0);
836 if (!irq) {
837 ret = -EINVAL;
838 goto err;
839 }
840
841 master = fsl_spi_probe(dev, &mem, irq);
842 if (IS_ERR(master)) {
843 ret = PTR_ERR(master);
844 goto err;
845 }
846
847 return 0;
848
849err:
850 irq_dispose_mapping(irq);
851 if (type == TYPE_FSL)
852 of_fsl_spi_free_chipselects(dev);
853 return ret;
854}
855
856static int of_fsl_spi_remove(struct platform_device *ofdev)
857{
858 struct spi_master *master = platform_get_drvdata(ofdev);
859 struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(master);
860
861 fsl_spi_cpm_free(mpc8xxx_spi);
862 if (mpc8xxx_spi->type == TYPE_FSL)
863 of_fsl_spi_free_chipselects(&ofdev->dev);
864 return 0;
865}
866
867static struct platform_driver of_fsl_spi_driver = {
868 .driver = {
869 .name = "fsl_spi",
870 .of_match_table = of_fsl_spi_match,
871 },
872 .probe = of_fsl_spi_probe,
873 .remove = of_fsl_spi_remove,
874};
875
876#ifdef CONFIG_MPC832x_RDB
877/*
878 * XXX XXX XXX
879 * This is "legacy" platform driver, was used by the MPC8323E-RDB boards
880 * only. The driver should go away soon, since newer MPC8323E-RDB's device
881 * tree can work with OpenFirmware driver. But for now we support old trees
882 * as well.
883 */
884static int plat_mpc8xxx_spi_probe(struct platform_device *pdev)
885{
886 struct resource *mem;
887 int irq;
888 struct spi_master *master;
889
890 if (!dev_get_platdata(&pdev->dev))
891 return -EINVAL;
892
893 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
894 if (!mem)
895 return -EINVAL;
896
897 irq = platform_get_irq(pdev, 0);
898 if (irq <= 0)
899 return -EINVAL;
900
901 master = fsl_spi_probe(&pdev->dev, mem, irq);
902 return PTR_ERR_OR_ZERO(master);
903}
904
905static int plat_mpc8xxx_spi_remove(struct platform_device *pdev)
906{
907 struct spi_master *master = platform_get_drvdata(pdev);
908 struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(master);
909
910 fsl_spi_cpm_free(mpc8xxx_spi);
911
912 return 0;
913}
914
915MODULE_ALIAS("platform:mpc8xxx_spi");
916static struct platform_driver mpc8xxx_spi_driver = {
917 .probe = plat_mpc8xxx_spi_probe,
918 .remove = plat_mpc8xxx_spi_remove,
919 .driver = {
920 .name = "mpc8xxx_spi",
921 },
922};
923
924static bool legacy_driver_failed;
925
926static void __init legacy_driver_register(void)
927{
928 legacy_driver_failed = platform_driver_register(&mpc8xxx_spi_driver);
929}
930
931static void __exit legacy_driver_unregister(void)
932{
933 if (legacy_driver_failed)
934 return;
935 platform_driver_unregister(&mpc8xxx_spi_driver);
936}
937#else
938static void __init legacy_driver_register(void) {}
939static void __exit legacy_driver_unregister(void) {}
940#endif /* CONFIG_MPC832x_RDB */
941
942static int __init fsl_spi_init(void)
943{
944 legacy_driver_register();
945 return platform_driver_register(&of_fsl_spi_driver);
946}
947module_init(fsl_spi_init);
948
949static void __exit fsl_spi_exit(void)
950{
951 platform_driver_unregister(&of_fsl_spi_driver);
952 legacy_driver_unregister();
953}
954module_exit(fsl_spi_exit);
955
956MODULE_AUTHOR("Kumar Gala");
957MODULE_DESCRIPTION("Simple Freescale SPI Driver");
958MODULE_LICENSE("GPL");