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1/*
2 * au1550 psc spi controller driver
3 * may work also with au1200, au1210, au1250
4 * will not work on au1000, au1100 and au1500 (no full spi controller there)
5 *
6 * Copyright (c) 2006 ATRON electronic GmbH
7 * Author: Jan Nikitenko <jan.nikitenko@gmail.com>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23
24#include <linux/init.h>
25#include <linux/interrupt.h>
26#include <linux/slab.h>
27#include <linux/errno.h>
28#include <linux/device.h>
29#include <linux/platform_device.h>
30#include <linux/resource.h>
31#include <linux/spi/spi.h>
32#include <linux/spi/spi_bitbang.h>
33#include <linux/dma-mapping.h>
34#include <linux/completion.h>
35#include <asm/mach-au1x00/au1000.h>
36#include <asm/mach-au1x00/au1xxx_psc.h>
37#include <asm/mach-au1x00/au1xxx_dbdma.h>
38
39#include <asm/mach-au1x00/au1550_spi.h>
40
41static unsigned usedma = 1;
42module_param(usedma, uint, 0644);
43
44/*
45#define AU1550_SPI_DEBUG_LOOPBACK
46*/
47
48
49#define AU1550_SPI_DBDMA_DESCRIPTORS 1
50#define AU1550_SPI_DMA_RXTMP_MINSIZE 2048U
51
52struct au1550_spi {
53 struct spi_bitbang bitbang;
54
55 volatile psc_spi_t __iomem *regs;
56 int irq;
57 unsigned freq_max;
58 unsigned freq_min;
59
60 unsigned len;
61 unsigned tx_count;
62 unsigned rx_count;
63 const u8 *tx;
64 u8 *rx;
65
66 void (*rx_word)(struct au1550_spi *hw);
67 void (*tx_word)(struct au1550_spi *hw);
68 int (*txrx_bufs)(struct spi_device *spi, struct spi_transfer *t);
69 irqreturn_t (*irq_callback)(struct au1550_spi *hw);
70
71 struct completion master_done;
72
73 unsigned usedma;
74 u32 dma_tx_id;
75 u32 dma_rx_id;
76 u32 dma_tx_ch;
77 u32 dma_rx_ch;
78
79 u8 *dma_rx_tmpbuf;
80 unsigned dma_rx_tmpbuf_size;
81 u32 dma_rx_tmpbuf_addr;
82
83 struct spi_master *master;
84 struct device *dev;
85 struct au1550_spi_info *pdata;
86 struct resource *ioarea;
87};
88
89
90/* we use an 8-bit memory device for dma transfers to/from spi fifo */
91static dbdev_tab_t au1550_spi_mem_dbdev =
92{
93 .dev_id = DBDMA_MEM_CHAN,
94 .dev_flags = DEV_FLAGS_ANYUSE|DEV_FLAGS_SYNC,
95 .dev_tsize = 0,
96 .dev_devwidth = 8,
97 .dev_physaddr = 0x00000000,
98 .dev_intlevel = 0,
99 .dev_intpolarity = 0
100};
101
102static int ddma_memid; /* id to above mem dma device */
103
104static void au1550_spi_bits_handlers_set(struct au1550_spi *hw, int bpw);
105
106
107/*
108 * compute BRG and DIV bits to setup spi clock based on main input clock rate
109 * that was specified in platform data structure
110 * according to au1550 datasheet:
111 * psc_tempclk = psc_mainclk / (2 << DIV)
112 * spiclk = psc_tempclk / (2 * (BRG + 1))
113 * BRG valid range is 4..63
114 * DIV valid range is 0..3
115 */
116static u32 au1550_spi_baudcfg(struct au1550_spi *hw, unsigned speed_hz)
117{
118 u32 mainclk_hz = hw->pdata->mainclk_hz;
119 u32 div, brg;
120
121 for (div = 0; div < 4; div++) {
122 brg = mainclk_hz / speed_hz / (4 << div);
123 /* now we have BRG+1 in brg, so count with that */
124 if (brg < (4 + 1)) {
125 brg = (4 + 1); /* speed_hz too big */
126 break; /* set lowest brg (div is == 0) */
127 }
128 if (brg <= (63 + 1))
129 break; /* we have valid brg and div */
130 }
131 if (div == 4) {
132 div = 3; /* speed_hz too small */
133 brg = (63 + 1); /* set highest brg and div */
134 }
135 brg--;
136 return PSC_SPICFG_SET_BAUD(brg) | PSC_SPICFG_SET_DIV(div);
137}
138
139static inline void au1550_spi_mask_ack_all(struct au1550_spi *hw)
140{
141 hw->regs->psc_spimsk =
142 PSC_SPIMSK_MM | PSC_SPIMSK_RR | PSC_SPIMSK_RO
143 | PSC_SPIMSK_RU | PSC_SPIMSK_TR | PSC_SPIMSK_TO
144 | PSC_SPIMSK_TU | PSC_SPIMSK_SD | PSC_SPIMSK_MD;
145 au_sync();
146
147 hw->regs->psc_spievent =
148 PSC_SPIEVNT_MM | PSC_SPIEVNT_RR | PSC_SPIEVNT_RO
149 | PSC_SPIEVNT_RU | PSC_SPIEVNT_TR | PSC_SPIEVNT_TO
150 | PSC_SPIEVNT_TU | PSC_SPIEVNT_SD | PSC_SPIEVNT_MD;
151 au_sync();
152}
153
154static void au1550_spi_reset_fifos(struct au1550_spi *hw)
155{
156 u32 pcr;
157
158 hw->regs->psc_spipcr = PSC_SPIPCR_RC | PSC_SPIPCR_TC;
159 au_sync();
160 do {
161 pcr = hw->regs->psc_spipcr;
162 au_sync();
163 } while (pcr != 0);
164}
165
166/*
167 * dma transfers are used for the most common spi word size of 8-bits
168 * we cannot easily change already set up dma channels' width, so if we wanted
169 * dma support for more than 8-bit words (up to 24 bits), we would need to
170 * setup dma channels from scratch on each spi transfer, based on bits_per_word
171 * instead we have pre set up 8 bit dma channels supporting spi 4 to 8 bits
172 * transfers, and 9 to 24 bits spi transfers will be done in pio irq based mode
173 * callbacks to handle dma or pio are set up in au1550_spi_bits_handlers_set()
174 */
175static void au1550_spi_chipsel(struct spi_device *spi, int value)
176{
177 struct au1550_spi *hw = spi_master_get_devdata(spi->master);
178 unsigned cspol = spi->mode & SPI_CS_HIGH ? 1 : 0;
179 u32 cfg, stat;
180
181 switch (value) {
182 case BITBANG_CS_INACTIVE:
183 if (hw->pdata->deactivate_cs)
184 hw->pdata->deactivate_cs(hw->pdata, spi->chip_select,
185 cspol);
186 break;
187
188 case BITBANG_CS_ACTIVE:
189 au1550_spi_bits_handlers_set(hw, spi->bits_per_word);
190
191 cfg = hw->regs->psc_spicfg;
192 au_sync();
193 hw->regs->psc_spicfg = cfg & ~PSC_SPICFG_DE_ENABLE;
194 au_sync();
195
196 if (spi->mode & SPI_CPOL)
197 cfg |= PSC_SPICFG_BI;
198 else
199 cfg &= ~PSC_SPICFG_BI;
200 if (spi->mode & SPI_CPHA)
201 cfg &= ~PSC_SPICFG_CDE;
202 else
203 cfg |= PSC_SPICFG_CDE;
204
205 if (spi->mode & SPI_LSB_FIRST)
206 cfg |= PSC_SPICFG_MLF;
207 else
208 cfg &= ~PSC_SPICFG_MLF;
209
210 if (hw->usedma && spi->bits_per_word <= 8)
211 cfg &= ~PSC_SPICFG_DD_DISABLE;
212 else
213 cfg |= PSC_SPICFG_DD_DISABLE;
214 cfg = PSC_SPICFG_CLR_LEN(cfg);
215 cfg |= PSC_SPICFG_SET_LEN(spi->bits_per_word);
216
217 cfg = PSC_SPICFG_CLR_BAUD(cfg);
218 cfg &= ~PSC_SPICFG_SET_DIV(3);
219 cfg |= au1550_spi_baudcfg(hw, spi->max_speed_hz);
220
221 hw->regs->psc_spicfg = cfg | PSC_SPICFG_DE_ENABLE;
222 au_sync();
223 do {
224 stat = hw->regs->psc_spistat;
225 au_sync();
226 } while ((stat & PSC_SPISTAT_DR) == 0);
227
228 if (hw->pdata->activate_cs)
229 hw->pdata->activate_cs(hw->pdata, spi->chip_select,
230 cspol);
231 break;
232 }
233}
234
235static int au1550_spi_setupxfer(struct spi_device *spi, struct spi_transfer *t)
236{
237 struct au1550_spi *hw = spi_master_get_devdata(spi->master);
238 unsigned bpw, hz;
239 u32 cfg, stat;
240
241 bpw = spi->bits_per_word;
242 hz = spi->max_speed_hz;
243 if (t) {
244 if (t->bits_per_word)
245 bpw = t->bits_per_word;
246 if (t->speed_hz)
247 hz = t->speed_hz;
248 }
249
250 if (bpw < 4 || bpw > 24) {
251 dev_err(&spi->dev, "setupxfer: invalid bits_per_word=%d\n",
252 bpw);
253 return -EINVAL;
254 }
255 if (hz > spi->max_speed_hz || hz > hw->freq_max || hz < hw->freq_min) {
256 dev_err(&spi->dev, "setupxfer: clock rate=%d out of range\n",
257 hz);
258 return -EINVAL;
259 }
260
261 au1550_spi_bits_handlers_set(hw, spi->bits_per_word);
262
263 cfg = hw->regs->psc_spicfg;
264 au_sync();
265 hw->regs->psc_spicfg = cfg & ~PSC_SPICFG_DE_ENABLE;
266 au_sync();
267
268 if (hw->usedma && bpw <= 8)
269 cfg &= ~PSC_SPICFG_DD_DISABLE;
270 else
271 cfg |= PSC_SPICFG_DD_DISABLE;
272 cfg = PSC_SPICFG_CLR_LEN(cfg);
273 cfg |= PSC_SPICFG_SET_LEN(bpw);
274
275 cfg = PSC_SPICFG_CLR_BAUD(cfg);
276 cfg &= ~PSC_SPICFG_SET_DIV(3);
277 cfg |= au1550_spi_baudcfg(hw, hz);
278
279 hw->regs->psc_spicfg = cfg;
280 au_sync();
281
282 if (cfg & PSC_SPICFG_DE_ENABLE) {
283 do {
284 stat = hw->regs->psc_spistat;
285 au_sync();
286 } while ((stat & PSC_SPISTAT_DR) == 0);
287 }
288
289 au1550_spi_reset_fifos(hw);
290 au1550_spi_mask_ack_all(hw);
291 return 0;
292}
293
294static int au1550_spi_setup(struct spi_device *spi)
295{
296 struct au1550_spi *hw = spi_master_get_devdata(spi->master);
297
298 if (spi->bits_per_word < 4 || spi->bits_per_word > 24) {
299 dev_err(&spi->dev, "setup: invalid bits_per_word=%d\n",
300 spi->bits_per_word);
301 return -EINVAL;
302 }
303
304 if (spi->max_speed_hz == 0)
305 spi->max_speed_hz = hw->freq_max;
306 if (spi->max_speed_hz > hw->freq_max
307 || spi->max_speed_hz < hw->freq_min)
308 return -EINVAL;
309 /*
310 * NOTE: cannot change speed and other hw settings immediately,
311 * otherwise sharing of spi bus is not possible,
312 * so do not call setupxfer(spi, NULL) here
313 */
314 return 0;
315}
316
317/*
318 * for dma spi transfers, we have to setup rx channel, otherwise there is
319 * no reliable way how to recognize that spi transfer is done
320 * dma complete callbacks are called before real spi transfer is finished
321 * and if only tx dma channel is set up (and rx fifo overflow event masked)
322 * spi master done event irq is not generated unless rx fifo is empty (emptied)
323 * so we need rx tmp buffer to use for rx dma if user does not provide one
324 */
325static int au1550_spi_dma_rxtmp_alloc(struct au1550_spi *hw, unsigned size)
326{
327 hw->dma_rx_tmpbuf = kmalloc(size, GFP_KERNEL);
328 if (!hw->dma_rx_tmpbuf)
329 return -ENOMEM;
330 hw->dma_rx_tmpbuf_size = size;
331 hw->dma_rx_tmpbuf_addr = dma_map_single(hw->dev, hw->dma_rx_tmpbuf,
332 size, DMA_FROM_DEVICE);
333 if (dma_mapping_error(hw->dev, hw->dma_rx_tmpbuf_addr)) {
334 kfree(hw->dma_rx_tmpbuf);
335 hw->dma_rx_tmpbuf = 0;
336 hw->dma_rx_tmpbuf_size = 0;
337 return -EFAULT;
338 }
339 return 0;
340}
341
342static void au1550_spi_dma_rxtmp_free(struct au1550_spi *hw)
343{
344 dma_unmap_single(hw->dev, hw->dma_rx_tmpbuf_addr,
345 hw->dma_rx_tmpbuf_size, DMA_FROM_DEVICE);
346 kfree(hw->dma_rx_tmpbuf);
347 hw->dma_rx_tmpbuf = 0;
348 hw->dma_rx_tmpbuf_size = 0;
349}
350
351static int au1550_spi_dma_txrxb(struct spi_device *spi, struct spi_transfer *t)
352{
353 struct au1550_spi *hw = spi_master_get_devdata(spi->master);
354 dma_addr_t dma_tx_addr;
355 dma_addr_t dma_rx_addr;
356 u32 res;
357
358 hw->len = t->len;
359 hw->tx_count = 0;
360 hw->rx_count = 0;
361
362 hw->tx = t->tx_buf;
363 hw->rx = t->rx_buf;
364 dma_tx_addr = t->tx_dma;
365 dma_rx_addr = t->rx_dma;
366
367 /*
368 * check if buffers are already dma mapped, map them otherwise:
369 * - first map the TX buffer, so cache data gets written to memory
370 * - then map the RX buffer, so that cache entries (with
371 * soon-to-be-stale data) get removed
372 * use rx buffer in place of tx if tx buffer was not provided
373 * use temp rx buffer (preallocated or realloc to fit) for rx dma
374 */
375 if (t->tx_buf) {
376 if (t->tx_dma == 0) { /* if DMA_ADDR_INVALID, map it */
377 dma_tx_addr = dma_map_single(hw->dev,
378 (void *)t->tx_buf,
379 t->len, DMA_TO_DEVICE);
380 if (dma_mapping_error(hw->dev, dma_tx_addr))
381 dev_err(hw->dev, "tx dma map error\n");
382 }
383 }
384
385 if (t->rx_buf) {
386 if (t->rx_dma == 0) { /* if DMA_ADDR_INVALID, map it */
387 dma_rx_addr = dma_map_single(hw->dev,
388 (void *)t->rx_buf,
389 t->len, DMA_FROM_DEVICE);
390 if (dma_mapping_error(hw->dev, dma_rx_addr))
391 dev_err(hw->dev, "rx dma map error\n");
392 }
393 } else {
394 if (t->len > hw->dma_rx_tmpbuf_size) {
395 int ret;
396
397 au1550_spi_dma_rxtmp_free(hw);
398 ret = au1550_spi_dma_rxtmp_alloc(hw, max(t->len,
399 AU1550_SPI_DMA_RXTMP_MINSIZE));
400 if (ret < 0)
401 return ret;
402 }
403 hw->rx = hw->dma_rx_tmpbuf;
404 dma_rx_addr = hw->dma_rx_tmpbuf_addr;
405 dma_sync_single_for_device(hw->dev, dma_rx_addr,
406 t->len, DMA_FROM_DEVICE);
407 }
408
409 if (!t->tx_buf) {
410 dma_sync_single_for_device(hw->dev, dma_rx_addr,
411 t->len, DMA_BIDIRECTIONAL);
412 hw->tx = hw->rx;
413 }
414
415 /* put buffers on the ring */
416 res = au1xxx_dbdma_put_dest(hw->dma_rx_ch, virt_to_phys(hw->rx),
417 t->len, DDMA_FLAGS_IE);
418 if (!res)
419 dev_err(hw->dev, "rx dma put dest error\n");
420
421 res = au1xxx_dbdma_put_source(hw->dma_tx_ch, virt_to_phys(hw->tx),
422 t->len, DDMA_FLAGS_IE);
423 if (!res)
424 dev_err(hw->dev, "tx dma put source error\n");
425
426 au1xxx_dbdma_start(hw->dma_rx_ch);
427 au1xxx_dbdma_start(hw->dma_tx_ch);
428
429 /* by default enable nearly all events interrupt */
430 hw->regs->psc_spimsk = PSC_SPIMSK_SD;
431 au_sync();
432
433 /* start the transfer */
434 hw->regs->psc_spipcr = PSC_SPIPCR_MS;
435 au_sync();
436
437 wait_for_completion(&hw->master_done);
438
439 au1xxx_dbdma_stop(hw->dma_tx_ch);
440 au1xxx_dbdma_stop(hw->dma_rx_ch);
441
442 if (!t->rx_buf) {
443 /* using the temporal preallocated and premapped buffer */
444 dma_sync_single_for_cpu(hw->dev, dma_rx_addr, t->len,
445 DMA_FROM_DEVICE);
446 }
447 /* unmap buffers if mapped above */
448 if (t->rx_buf && t->rx_dma == 0 )
449 dma_unmap_single(hw->dev, dma_rx_addr, t->len,
450 DMA_FROM_DEVICE);
451 if (t->tx_buf && t->tx_dma == 0 )
452 dma_unmap_single(hw->dev, dma_tx_addr, t->len,
453 DMA_TO_DEVICE);
454
455 return hw->rx_count < hw->tx_count ? hw->rx_count : hw->tx_count;
456}
457
458static irqreturn_t au1550_spi_dma_irq_callback(struct au1550_spi *hw)
459{
460 u32 stat, evnt;
461
462 stat = hw->regs->psc_spistat;
463 evnt = hw->regs->psc_spievent;
464 au_sync();
465 if ((stat & PSC_SPISTAT_DI) == 0) {
466 dev_err(hw->dev, "Unexpected IRQ!\n");
467 return IRQ_NONE;
468 }
469
470 if ((evnt & (PSC_SPIEVNT_MM | PSC_SPIEVNT_RO
471 | PSC_SPIEVNT_RU | PSC_SPIEVNT_TO
472 | PSC_SPIEVNT_TU | PSC_SPIEVNT_SD))
473 != 0) {
474 /*
475 * due to an spi error we consider transfer as done,
476 * so mask all events until before next transfer start
477 * and stop the possibly running dma immediatelly
478 */
479 au1550_spi_mask_ack_all(hw);
480 au1xxx_dbdma_stop(hw->dma_rx_ch);
481 au1xxx_dbdma_stop(hw->dma_tx_ch);
482
483 /* get number of transferred bytes */
484 hw->rx_count = hw->len - au1xxx_get_dma_residue(hw->dma_rx_ch);
485 hw->tx_count = hw->len - au1xxx_get_dma_residue(hw->dma_tx_ch);
486
487 au1xxx_dbdma_reset(hw->dma_rx_ch);
488 au1xxx_dbdma_reset(hw->dma_tx_ch);
489 au1550_spi_reset_fifos(hw);
490
491 if (evnt == PSC_SPIEVNT_RO)
492 dev_err(hw->dev,
493 "dma transfer: receive FIFO overflow!\n");
494 else
495 dev_err(hw->dev,
496 "dma transfer: unexpected SPI error "
497 "(event=0x%x stat=0x%x)!\n", evnt, stat);
498
499 complete(&hw->master_done);
500 return IRQ_HANDLED;
501 }
502
503 if ((evnt & PSC_SPIEVNT_MD) != 0) {
504 /* transfer completed successfully */
505 au1550_spi_mask_ack_all(hw);
506 hw->rx_count = hw->len;
507 hw->tx_count = hw->len;
508 complete(&hw->master_done);
509 }
510 return IRQ_HANDLED;
511}
512
513
514/* routines to handle different word sizes in pio mode */
515#define AU1550_SPI_RX_WORD(size, mask) \
516static void au1550_spi_rx_word_##size(struct au1550_spi *hw) \
517{ \
518 u32 fifoword = hw->regs->psc_spitxrx & (u32)(mask); \
519 au_sync(); \
520 if (hw->rx) { \
521 *(u##size *)hw->rx = (u##size)fifoword; \
522 hw->rx += (size) / 8; \
523 } \
524 hw->rx_count += (size) / 8; \
525}
526
527#define AU1550_SPI_TX_WORD(size, mask) \
528static void au1550_spi_tx_word_##size(struct au1550_spi *hw) \
529{ \
530 u32 fifoword = 0; \
531 if (hw->tx) { \
532 fifoword = *(u##size *)hw->tx & (u32)(mask); \
533 hw->tx += (size) / 8; \
534 } \
535 hw->tx_count += (size) / 8; \
536 if (hw->tx_count >= hw->len) \
537 fifoword |= PSC_SPITXRX_LC; \
538 hw->regs->psc_spitxrx = fifoword; \
539 au_sync(); \
540}
541
542AU1550_SPI_RX_WORD(8,0xff)
543AU1550_SPI_RX_WORD(16,0xffff)
544AU1550_SPI_RX_WORD(32,0xffffff)
545AU1550_SPI_TX_WORD(8,0xff)
546AU1550_SPI_TX_WORD(16,0xffff)
547AU1550_SPI_TX_WORD(32,0xffffff)
548
549static int au1550_spi_pio_txrxb(struct spi_device *spi, struct spi_transfer *t)
550{
551 u32 stat, mask;
552 struct au1550_spi *hw = spi_master_get_devdata(spi->master);
553
554 hw->tx = t->tx_buf;
555 hw->rx = t->rx_buf;
556 hw->len = t->len;
557 hw->tx_count = 0;
558 hw->rx_count = 0;
559
560 /* by default enable nearly all events after filling tx fifo */
561 mask = PSC_SPIMSK_SD;
562
563 /* fill the transmit FIFO */
564 while (hw->tx_count < hw->len) {
565
566 hw->tx_word(hw);
567
568 if (hw->tx_count >= hw->len) {
569 /* mask tx fifo request interrupt as we are done */
570 mask |= PSC_SPIMSK_TR;
571 }
572
573 stat = hw->regs->psc_spistat;
574 au_sync();
575 if (stat & PSC_SPISTAT_TF)
576 break;
577 }
578
579 /* enable event interrupts */
580 hw->regs->psc_spimsk = mask;
581 au_sync();
582
583 /* start the transfer */
584 hw->regs->psc_spipcr = PSC_SPIPCR_MS;
585 au_sync();
586
587 wait_for_completion(&hw->master_done);
588
589 return hw->rx_count < hw->tx_count ? hw->rx_count : hw->tx_count;
590}
591
592static irqreturn_t au1550_spi_pio_irq_callback(struct au1550_spi *hw)
593{
594 int busy;
595 u32 stat, evnt;
596
597 stat = hw->regs->psc_spistat;
598 evnt = hw->regs->psc_spievent;
599 au_sync();
600 if ((stat & PSC_SPISTAT_DI) == 0) {
601 dev_err(hw->dev, "Unexpected IRQ!\n");
602 return IRQ_NONE;
603 }
604
605 if ((evnt & (PSC_SPIEVNT_MM | PSC_SPIEVNT_RO
606 | PSC_SPIEVNT_RU | PSC_SPIEVNT_TO
607 | PSC_SPIEVNT_SD))
608 != 0) {
609 /*
610 * due to an error we consider transfer as done,
611 * so mask all events until before next transfer start
612 */
613 au1550_spi_mask_ack_all(hw);
614 au1550_spi_reset_fifos(hw);
615 dev_err(hw->dev,
616 "pio transfer: unexpected SPI error "
617 "(event=0x%x stat=0x%x)!\n", evnt, stat);
618 complete(&hw->master_done);
619 return IRQ_HANDLED;
620 }
621
622 /*
623 * while there is something to read from rx fifo
624 * or there is a space to write to tx fifo:
625 */
626 do {
627 busy = 0;
628 stat = hw->regs->psc_spistat;
629 au_sync();
630
631 /*
632 * Take care to not let the Rx FIFO overflow.
633 *
634 * We only write a byte if we have read one at least. Initially,
635 * the write fifo is full, so we should read from the read fifo
636 * first.
637 * In case we miss a word from the read fifo, we should get a
638 * RO event and should back out.
639 */
640 if (!(stat & PSC_SPISTAT_RE) && hw->rx_count < hw->len) {
641 hw->rx_word(hw);
642 busy = 1;
643
644 if (!(stat & PSC_SPISTAT_TF) && hw->tx_count < hw->len)
645 hw->tx_word(hw);
646 }
647 } while (busy);
648
649 hw->regs->psc_spievent = PSC_SPIEVNT_RR | PSC_SPIEVNT_TR;
650 au_sync();
651
652 /*
653 * Restart the SPI transmission in case of a transmit underflow.
654 * This seems to work despite the notes in the Au1550 data book
655 * of Figure 8-4 with flowchart for SPI master operation:
656 *
657 * """Note 1: An XFR Error Interrupt occurs, unless masked,
658 * for any of the following events: Tx FIFO Underflow,
659 * Rx FIFO Overflow, or Multiple-master Error
660 * Note 2: In case of a Tx Underflow Error, all zeroes are
661 * transmitted."""
662 *
663 * By simply restarting the spi transfer on Tx Underflow Error,
664 * we assume that spi transfer was paused instead of zeroes
665 * transmittion mentioned in the Note 2 of Au1550 data book.
666 */
667 if (evnt & PSC_SPIEVNT_TU) {
668 hw->regs->psc_spievent = PSC_SPIEVNT_TU | PSC_SPIEVNT_MD;
669 au_sync();
670 hw->regs->psc_spipcr = PSC_SPIPCR_MS;
671 au_sync();
672 }
673
674 if (hw->rx_count >= hw->len) {
675 /* transfer completed successfully */
676 au1550_spi_mask_ack_all(hw);
677 complete(&hw->master_done);
678 }
679 return IRQ_HANDLED;
680}
681
682static int au1550_spi_txrx_bufs(struct spi_device *spi, struct spi_transfer *t)
683{
684 struct au1550_spi *hw = spi_master_get_devdata(spi->master);
685 return hw->txrx_bufs(spi, t);
686}
687
688static irqreturn_t au1550_spi_irq(int irq, void *dev)
689{
690 struct au1550_spi *hw = dev;
691 return hw->irq_callback(hw);
692}
693
694static void au1550_spi_bits_handlers_set(struct au1550_spi *hw, int bpw)
695{
696 if (bpw <= 8) {
697 if (hw->usedma) {
698 hw->txrx_bufs = &au1550_spi_dma_txrxb;
699 hw->irq_callback = &au1550_spi_dma_irq_callback;
700 } else {
701 hw->rx_word = &au1550_spi_rx_word_8;
702 hw->tx_word = &au1550_spi_tx_word_8;
703 hw->txrx_bufs = &au1550_spi_pio_txrxb;
704 hw->irq_callback = &au1550_spi_pio_irq_callback;
705 }
706 } else if (bpw <= 16) {
707 hw->rx_word = &au1550_spi_rx_word_16;
708 hw->tx_word = &au1550_spi_tx_word_16;
709 hw->txrx_bufs = &au1550_spi_pio_txrxb;
710 hw->irq_callback = &au1550_spi_pio_irq_callback;
711 } else {
712 hw->rx_word = &au1550_spi_rx_word_32;
713 hw->tx_word = &au1550_spi_tx_word_32;
714 hw->txrx_bufs = &au1550_spi_pio_txrxb;
715 hw->irq_callback = &au1550_spi_pio_irq_callback;
716 }
717}
718
719static void __init au1550_spi_setup_psc_as_spi(struct au1550_spi *hw)
720{
721 u32 stat, cfg;
722
723 /* set up the PSC for SPI mode */
724 hw->regs->psc_ctrl = PSC_CTRL_DISABLE;
725 au_sync();
726 hw->regs->psc_sel = PSC_SEL_PS_SPIMODE;
727 au_sync();
728
729 hw->regs->psc_spicfg = 0;
730 au_sync();
731
732 hw->regs->psc_ctrl = PSC_CTRL_ENABLE;
733 au_sync();
734
735 do {
736 stat = hw->regs->psc_spistat;
737 au_sync();
738 } while ((stat & PSC_SPISTAT_SR) == 0);
739
740
741 cfg = hw->usedma ? 0 : PSC_SPICFG_DD_DISABLE;
742 cfg |= PSC_SPICFG_SET_LEN(8);
743 cfg |= PSC_SPICFG_RT_FIFO8 | PSC_SPICFG_TT_FIFO8;
744 /* use minimal allowed brg and div values as initial setting: */
745 cfg |= PSC_SPICFG_SET_BAUD(4) | PSC_SPICFG_SET_DIV(0);
746
747#ifdef AU1550_SPI_DEBUG_LOOPBACK
748 cfg |= PSC_SPICFG_LB;
749#endif
750
751 hw->regs->psc_spicfg = cfg;
752 au_sync();
753
754 au1550_spi_mask_ack_all(hw);
755
756 hw->regs->psc_spicfg |= PSC_SPICFG_DE_ENABLE;
757 au_sync();
758
759 do {
760 stat = hw->regs->psc_spistat;
761 au_sync();
762 } while ((stat & PSC_SPISTAT_DR) == 0);
763
764 au1550_spi_reset_fifos(hw);
765}
766
767
768static int __init au1550_spi_probe(struct platform_device *pdev)
769{
770 struct au1550_spi *hw;
771 struct spi_master *master;
772 struct resource *r;
773 int err = 0;
774
775 master = spi_alloc_master(&pdev->dev, sizeof(struct au1550_spi));
776 if (master == NULL) {
777 dev_err(&pdev->dev, "No memory for spi_master\n");
778 err = -ENOMEM;
779 goto err_nomem;
780 }
781
782 /* the spi->mode bits understood by this driver: */
783 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST;
784
785 hw = spi_master_get_devdata(master);
786
787 hw->master = spi_master_get(master);
788 hw->pdata = pdev->dev.platform_data;
789 hw->dev = &pdev->dev;
790
791 if (hw->pdata == NULL) {
792 dev_err(&pdev->dev, "No platform data supplied\n");
793 err = -ENOENT;
794 goto err_no_pdata;
795 }
796
797 r = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
798 if (!r) {
799 dev_err(&pdev->dev, "no IRQ\n");
800 err = -ENODEV;
801 goto err_no_iores;
802 }
803 hw->irq = r->start;
804
805 hw->usedma = 0;
806 r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
807 if (r) {
808 hw->dma_tx_id = r->start;
809 r = platform_get_resource(pdev, IORESOURCE_DMA, 1);
810 if (r) {
811 hw->dma_rx_id = r->start;
812 if (usedma && ddma_memid) {
813 if (pdev->dev.dma_mask == NULL)
814 dev_warn(&pdev->dev, "no dma mask\n");
815 else
816 hw->usedma = 1;
817 }
818 }
819 }
820
821 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
822 if (!r) {
823 dev_err(&pdev->dev, "no mmio resource\n");
824 err = -ENODEV;
825 goto err_no_iores;
826 }
827
828 hw->ioarea = request_mem_region(r->start, sizeof(psc_spi_t),
829 pdev->name);
830 if (!hw->ioarea) {
831 dev_err(&pdev->dev, "Cannot reserve iomem region\n");
832 err = -ENXIO;
833 goto err_no_iores;
834 }
835
836 hw->regs = (psc_spi_t __iomem *)ioremap(r->start, sizeof(psc_spi_t));
837 if (!hw->regs) {
838 dev_err(&pdev->dev, "cannot ioremap\n");
839 err = -ENXIO;
840 goto err_ioremap;
841 }
842
843 platform_set_drvdata(pdev, hw);
844
845 init_completion(&hw->master_done);
846
847 hw->bitbang.master = hw->master;
848 hw->bitbang.setup_transfer = au1550_spi_setupxfer;
849 hw->bitbang.chipselect = au1550_spi_chipsel;
850 hw->bitbang.master->setup = au1550_spi_setup;
851 hw->bitbang.txrx_bufs = au1550_spi_txrx_bufs;
852
853 if (hw->usedma) {
854 hw->dma_tx_ch = au1xxx_dbdma_chan_alloc(ddma_memid,
855 hw->dma_tx_id, NULL, (void *)hw);
856 if (hw->dma_tx_ch == 0) {
857 dev_err(&pdev->dev,
858 "Cannot allocate tx dma channel\n");
859 err = -ENXIO;
860 goto err_no_txdma;
861 }
862 au1xxx_dbdma_set_devwidth(hw->dma_tx_ch, 8);
863 if (au1xxx_dbdma_ring_alloc(hw->dma_tx_ch,
864 AU1550_SPI_DBDMA_DESCRIPTORS) == 0) {
865 dev_err(&pdev->dev,
866 "Cannot allocate tx dma descriptors\n");
867 err = -ENXIO;
868 goto err_no_txdma_descr;
869 }
870
871
872 hw->dma_rx_ch = au1xxx_dbdma_chan_alloc(hw->dma_rx_id,
873 ddma_memid, NULL, (void *)hw);
874 if (hw->dma_rx_ch == 0) {
875 dev_err(&pdev->dev,
876 "Cannot allocate rx dma channel\n");
877 err = -ENXIO;
878 goto err_no_rxdma;
879 }
880 au1xxx_dbdma_set_devwidth(hw->dma_rx_ch, 8);
881 if (au1xxx_dbdma_ring_alloc(hw->dma_rx_ch,
882 AU1550_SPI_DBDMA_DESCRIPTORS) == 0) {
883 dev_err(&pdev->dev,
884 "Cannot allocate rx dma descriptors\n");
885 err = -ENXIO;
886 goto err_no_rxdma_descr;
887 }
888
889 err = au1550_spi_dma_rxtmp_alloc(hw,
890 AU1550_SPI_DMA_RXTMP_MINSIZE);
891 if (err < 0) {
892 dev_err(&pdev->dev,
893 "Cannot allocate initial rx dma tmp buffer\n");
894 goto err_dma_rxtmp_alloc;
895 }
896 }
897
898 au1550_spi_bits_handlers_set(hw, 8);
899
900 err = request_irq(hw->irq, au1550_spi_irq, 0, pdev->name, hw);
901 if (err) {
902 dev_err(&pdev->dev, "Cannot claim IRQ\n");
903 goto err_no_irq;
904 }
905
906 master->bus_num = pdev->id;
907 master->num_chipselect = hw->pdata->num_chipselect;
908
909 /*
910 * precompute valid range for spi freq - from au1550 datasheet:
911 * psc_tempclk = psc_mainclk / (2 << DIV)
912 * spiclk = psc_tempclk / (2 * (BRG + 1))
913 * BRG valid range is 4..63
914 * DIV valid range is 0..3
915 * round the min and max frequencies to values that would still
916 * produce valid brg and div
917 */
918 {
919 int min_div = (2 << 0) * (2 * (4 + 1));
920 int max_div = (2 << 3) * (2 * (63 + 1));
921 hw->freq_max = hw->pdata->mainclk_hz / min_div;
922 hw->freq_min = hw->pdata->mainclk_hz / (max_div + 1) + 1;
923 }
924
925 au1550_spi_setup_psc_as_spi(hw);
926
927 err = spi_bitbang_start(&hw->bitbang);
928 if (err) {
929 dev_err(&pdev->dev, "Failed to register SPI master\n");
930 goto err_register;
931 }
932
933 dev_info(&pdev->dev,
934 "spi master registered: bus_num=%d num_chipselect=%d\n",
935 master->bus_num, master->num_chipselect);
936
937 return 0;
938
939err_register:
940 free_irq(hw->irq, hw);
941
942err_no_irq:
943 au1550_spi_dma_rxtmp_free(hw);
944
945err_dma_rxtmp_alloc:
946err_no_rxdma_descr:
947 if (hw->usedma)
948 au1xxx_dbdma_chan_free(hw->dma_rx_ch);
949
950err_no_rxdma:
951err_no_txdma_descr:
952 if (hw->usedma)
953 au1xxx_dbdma_chan_free(hw->dma_tx_ch);
954
955err_no_txdma:
956 iounmap((void __iomem *)hw->regs);
957
958err_ioremap:
959 release_resource(hw->ioarea);
960 kfree(hw->ioarea);
961
962err_no_iores:
963err_no_pdata:
964 spi_master_put(hw->master);
965
966err_nomem:
967 return err;
968}
969
970static int __exit au1550_spi_remove(struct platform_device *pdev)
971{
972 struct au1550_spi *hw = platform_get_drvdata(pdev);
973
974 dev_info(&pdev->dev, "spi master remove: bus_num=%d\n",
975 hw->master->bus_num);
976
977 spi_bitbang_stop(&hw->bitbang);
978 free_irq(hw->irq, hw);
979 iounmap((void __iomem *)hw->regs);
980 release_resource(hw->ioarea);
981 kfree(hw->ioarea);
982
983 if (hw->usedma) {
984 au1550_spi_dma_rxtmp_free(hw);
985 au1xxx_dbdma_chan_free(hw->dma_rx_ch);
986 au1xxx_dbdma_chan_free(hw->dma_tx_ch);
987 }
988
989 platform_set_drvdata(pdev, NULL);
990
991 spi_master_put(hw->master);
992 return 0;
993}
994
995/* work with hotplug and coldplug */
996MODULE_ALIAS("platform:au1550-spi");
997
998static struct platform_driver au1550_spi_drv = {
999 .remove = __exit_p(au1550_spi_remove),
1000 .driver = {
1001 .name = "au1550-spi",
1002 .owner = THIS_MODULE,
1003 },
1004};
1005
1006static int __init au1550_spi_init(void)
1007{
1008 /*
1009 * create memory device with 8 bits dev_devwidth
1010 * needed for proper byte ordering to spi fifo
1011 */
1012 if (usedma) {
1013 ddma_memid = au1xxx_ddma_add_device(&au1550_spi_mem_dbdev);
1014 if (!ddma_memid)
1015 printk(KERN_ERR "au1550-spi: cannot add memory"
1016 "dbdma device\n");
1017 }
1018 return platform_driver_probe(&au1550_spi_drv, au1550_spi_probe);
1019}
1020module_init(au1550_spi_init);
1021
1022static void __exit au1550_spi_exit(void)
1023{
1024 if (usedma && ddma_memid)
1025 au1xxx_ddma_del_device(ddma_memid);
1026 platform_driver_unregister(&au1550_spi_drv);
1027}
1028module_exit(au1550_spi_exit);
1029
1030MODULE_DESCRIPTION("Au1550 PSC SPI Driver");
1031MODULE_AUTHOR("Jan Nikitenko <jan.nikitenko@gmail.com>");
1032MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * au1550 psc spi controller driver
4 * may work also with au1200, au1210, au1250
5 * will not work on au1000, au1100 and au1500 (no full spi controller there)
6 *
7 * Copyright (c) 2006 ATRON electronic GmbH
8 * Author: Jan Nikitenko <jan.nikitenko@gmail.com>
9 */
10
11#include <linux/init.h>
12#include <linux/interrupt.h>
13#include <linux/slab.h>
14#include <linux/errno.h>
15#include <linux/module.h>
16#include <linux/device.h>
17#include <linux/platform_device.h>
18#include <linux/resource.h>
19#include <linux/spi/spi.h>
20#include <linux/spi/spi_bitbang.h>
21#include <linux/dma-mapping.h>
22#include <linux/completion.h>
23#include <asm/mach-au1x00/au1000.h>
24#include <asm/mach-au1x00/au1xxx_psc.h>
25#include <asm/mach-au1x00/au1xxx_dbdma.h>
26
27#include <asm/mach-au1x00/au1550_spi.h>
28
29static unsigned usedma = 1;
30module_param(usedma, uint, 0644);
31
32/*
33#define AU1550_SPI_DEBUG_LOOPBACK
34*/
35
36
37#define AU1550_SPI_DBDMA_DESCRIPTORS 1
38#define AU1550_SPI_DMA_RXTMP_MINSIZE 2048U
39
40struct au1550_spi {
41 struct spi_bitbang bitbang;
42
43 volatile psc_spi_t __iomem *regs;
44 int irq;
45
46 unsigned len;
47 unsigned tx_count;
48 unsigned rx_count;
49 const u8 *tx;
50 u8 *rx;
51
52 void (*rx_word)(struct au1550_spi *hw);
53 void (*tx_word)(struct au1550_spi *hw);
54 int (*txrx_bufs)(struct spi_device *spi, struct spi_transfer *t);
55 irqreturn_t (*irq_callback)(struct au1550_spi *hw);
56
57 struct completion master_done;
58
59 unsigned usedma;
60 u32 dma_tx_id;
61 u32 dma_rx_id;
62 u32 dma_tx_ch;
63 u32 dma_rx_ch;
64
65 u8 *dma_rx_tmpbuf;
66 unsigned dma_rx_tmpbuf_size;
67 u32 dma_rx_tmpbuf_addr;
68
69 struct spi_master *master;
70 struct device *dev;
71 struct au1550_spi_info *pdata;
72 struct resource *ioarea;
73};
74
75
76/* we use an 8-bit memory device for dma transfers to/from spi fifo */
77static dbdev_tab_t au1550_spi_mem_dbdev =
78{
79 .dev_id = DBDMA_MEM_CHAN,
80 .dev_flags = DEV_FLAGS_ANYUSE|DEV_FLAGS_SYNC,
81 .dev_tsize = 0,
82 .dev_devwidth = 8,
83 .dev_physaddr = 0x00000000,
84 .dev_intlevel = 0,
85 .dev_intpolarity = 0
86};
87
88static int ddma_memid; /* id to above mem dma device */
89
90static void au1550_spi_bits_handlers_set(struct au1550_spi *hw, int bpw);
91
92
93/*
94 * compute BRG and DIV bits to setup spi clock based on main input clock rate
95 * that was specified in platform data structure
96 * according to au1550 datasheet:
97 * psc_tempclk = psc_mainclk / (2 << DIV)
98 * spiclk = psc_tempclk / (2 * (BRG + 1))
99 * BRG valid range is 4..63
100 * DIV valid range is 0..3
101 */
102static u32 au1550_spi_baudcfg(struct au1550_spi *hw, unsigned speed_hz)
103{
104 u32 mainclk_hz = hw->pdata->mainclk_hz;
105 u32 div, brg;
106
107 for (div = 0; div < 4; div++) {
108 brg = mainclk_hz / speed_hz / (4 << div);
109 /* now we have BRG+1 in brg, so count with that */
110 if (brg < (4 + 1)) {
111 brg = (4 + 1); /* speed_hz too big */
112 break; /* set lowest brg (div is == 0) */
113 }
114 if (brg <= (63 + 1))
115 break; /* we have valid brg and div */
116 }
117 if (div == 4) {
118 div = 3; /* speed_hz too small */
119 brg = (63 + 1); /* set highest brg and div */
120 }
121 brg--;
122 return PSC_SPICFG_SET_BAUD(brg) | PSC_SPICFG_SET_DIV(div);
123}
124
125static inline void au1550_spi_mask_ack_all(struct au1550_spi *hw)
126{
127 hw->regs->psc_spimsk =
128 PSC_SPIMSK_MM | PSC_SPIMSK_RR | PSC_SPIMSK_RO
129 | PSC_SPIMSK_RU | PSC_SPIMSK_TR | PSC_SPIMSK_TO
130 | PSC_SPIMSK_TU | PSC_SPIMSK_SD | PSC_SPIMSK_MD;
131 wmb(); /* drain writebuffer */
132
133 hw->regs->psc_spievent =
134 PSC_SPIEVNT_MM | PSC_SPIEVNT_RR | PSC_SPIEVNT_RO
135 | PSC_SPIEVNT_RU | PSC_SPIEVNT_TR | PSC_SPIEVNT_TO
136 | PSC_SPIEVNT_TU | PSC_SPIEVNT_SD | PSC_SPIEVNT_MD;
137 wmb(); /* drain writebuffer */
138}
139
140static void au1550_spi_reset_fifos(struct au1550_spi *hw)
141{
142 u32 pcr;
143
144 hw->regs->psc_spipcr = PSC_SPIPCR_RC | PSC_SPIPCR_TC;
145 wmb(); /* drain writebuffer */
146 do {
147 pcr = hw->regs->psc_spipcr;
148 wmb(); /* drain writebuffer */
149 } while (pcr != 0);
150}
151
152/*
153 * dma transfers are used for the most common spi word size of 8-bits
154 * we cannot easily change already set up dma channels' width, so if we wanted
155 * dma support for more than 8-bit words (up to 24 bits), we would need to
156 * setup dma channels from scratch on each spi transfer, based on bits_per_word
157 * instead we have pre set up 8 bit dma channels supporting spi 4 to 8 bits
158 * transfers, and 9 to 24 bits spi transfers will be done in pio irq based mode
159 * callbacks to handle dma or pio are set up in au1550_spi_bits_handlers_set()
160 */
161static void au1550_spi_chipsel(struct spi_device *spi, int value)
162{
163 struct au1550_spi *hw = spi_master_get_devdata(spi->master);
164 unsigned cspol = spi->mode & SPI_CS_HIGH ? 1 : 0;
165 u32 cfg, stat;
166
167 switch (value) {
168 case BITBANG_CS_INACTIVE:
169 if (hw->pdata->deactivate_cs)
170 hw->pdata->deactivate_cs(hw->pdata, spi->chip_select,
171 cspol);
172 break;
173
174 case BITBANG_CS_ACTIVE:
175 au1550_spi_bits_handlers_set(hw, spi->bits_per_word);
176
177 cfg = hw->regs->psc_spicfg;
178 wmb(); /* drain writebuffer */
179 hw->regs->psc_spicfg = cfg & ~PSC_SPICFG_DE_ENABLE;
180 wmb(); /* drain writebuffer */
181
182 if (spi->mode & SPI_CPOL)
183 cfg |= PSC_SPICFG_BI;
184 else
185 cfg &= ~PSC_SPICFG_BI;
186 if (spi->mode & SPI_CPHA)
187 cfg &= ~PSC_SPICFG_CDE;
188 else
189 cfg |= PSC_SPICFG_CDE;
190
191 if (spi->mode & SPI_LSB_FIRST)
192 cfg |= PSC_SPICFG_MLF;
193 else
194 cfg &= ~PSC_SPICFG_MLF;
195
196 if (hw->usedma && spi->bits_per_word <= 8)
197 cfg &= ~PSC_SPICFG_DD_DISABLE;
198 else
199 cfg |= PSC_SPICFG_DD_DISABLE;
200 cfg = PSC_SPICFG_CLR_LEN(cfg);
201 cfg |= PSC_SPICFG_SET_LEN(spi->bits_per_word);
202
203 cfg = PSC_SPICFG_CLR_BAUD(cfg);
204 cfg &= ~PSC_SPICFG_SET_DIV(3);
205 cfg |= au1550_spi_baudcfg(hw, spi->max_speed_hz);
206
207 hw->regs->psc_spicfg = cfg | PSC_SPICFG_DE_ENABLE;
208 wmb(); /* drain writebuffer */
209 do {
210 stat = hw->regs->psc_spistat;
211 wmb(); /* drain writebuffer */
212 } while ((stat & PSC_SPISTAT_DR) == 0);
213
214 if (hw->pdata->activate_cs)
215 hw->pdata->activate_cs(hw->pdata, spi->chip_select,
216 cspol);
217 break;
218 }
219}
220
221static int au1550_spi_setupxfer(struct spi_device *spi, struct spi_transfer *t)
222{
223 struct au1550_spi *hw = spi_master_get_devdata(spi->master);
224 unsigned bpw, hz;
225 u32 cfg, stat;
226
227 if (t) {
228 bpw = t->bits_per_word;
229 hz = t->speed_hz;
230 } else {
231 bpw = spi->bits_per_word;
232 hz = spi->max_speed_hz;
233 }
234
235 if (!hz)
236 return -EINVAL;
237
238 au1550_spi_bits_handlers_set(hw, spi->bits_per_word);
239
240 cfg = hw->regs->psc_spicfg;
241 wmb(); /* drain writebuffer */
242 hw->regs->psc_spicfg = cfg & ~PSC_SPICFG_DE_ENABLE;
243 wmb(); /* drain writebuffer */
244
245 if (hw->usedma && bpw <= 8)
246 cfg &= ~PSC_SPICFG_DD_DISABLE;
247 else
248 cfg |= PSC_SPICFG_DD_DISABLE;
249 cfg = PSC_SPICFG_CLR_LEN(cfg);
250 cfg |= PSC_SPICFG_SET_LEN(bpw);
251
252 cfg = PSC_SPICFG_CLR_BAUD(cfg);
253 cfg &= ~PSC_SPICFG_SET_DIV(3);
254 cfg |= au1550_spi_baudcfg(hw, hz);
255
256 hw->regs->psc_spicfg = cfg;
257 wmb(); /* drain writebuffer */
258
259 if (cfg & PSC_SPICFG_DE_ENABLE) {
260 do {
261 stat = hw->regs->psc_spistat;
262 wmb(); /* drain writebuffer */
263 } while ((stat & PSC_SPISTAT_DR) == 0);
264 }
265
266 au1550_spi_reset_fifos(hw);
267 au1550_spi_mask_ack_all(hw);
268 return 0;
269}
270
271/*
272 * for dma spi transfers, we have to setup rx channel, otherwise there is
273 * no reliable way how to recognize that spi transfer is done
274 * dma complete callbacks are called before real spi transfer is finished
275 * and if only tx dma channel is set up (and rx fifo overflow event masked)
276 * spi master done event irq is not generated unless rx fifo is empty (emptied)
277 * so we need rx tmp buffer to use for rx dma if user does not provide one
278 */
279static int au1550_spi_dma_rxtmp_alloc(struct au1550_spi *hw, unsigned size)
280{
281 hw->dma_rx_tmpbuf = kmalloc(size, GFP_KERNEL);
282 if (!hw->dma_rx_tmpbuf)
283 return -ENOMEM;
284 hw->dma_rx_tmpbuf_size = size;
285 hw->dma_rx_tmpbuf_addr = dma_map_single(hw->dev, hw->dma_rx_tmpbuf,
286 size, DMA_FROM_DEVICE);
287 if (dma_mapping_error(hw->dev, hw->dma_rx_tmpbuf_addr)) {
288 kfree(hw->dma_rx_tmpbuf);
289 hw->dma_rx_tmpbuf = 0;
290 hw->dma_rx_tmpbuf_size = 0;
291 return -EFAULT;
292 }
293 return 0;
294}
295
296static void au1550_spi_dma_rxtmp_free(struct au1550_spi *hw)
297{
298 dma_unmap_single(hw->dev, hw->dma_rx_tmpbuf_addr,
299 hw->dma_rx_tmpbuf_size, DMA_FROM_DEVICE);
300 kfree(hw->dma_rx_tmpbuf);
301 hw->dma_rx_tmpbuf = 0;
302 hw->dma_rx_tmpbuf_size = 0;
303}
304
305static int au1550_spi_dma_txrxb(struct spi_device *spi, struct spi_transfer *t)
306{
307 struct au1550_spi *hw = spi_master_get_devdata(spi->master);
308 dma_addr_t dma_tx_addr;
309 dma_addr_t dma_rx_addr;
310 u32 res;
311
312 hw->len = t->len;
313 hw->tx_count = 0;
314 hw->rx_count = 0;
315
316 hw->tx = t->tx_buf;
317 hw->rx = t->rx_buf;
318 dma_tx_addr = t->tx_dma;
319 dma_rx_addr = t->rx_dma;
320
321 /*
322 * check if buffers are already dma mapped, map them otherwise:
323 * - first map the TX buffer, so cache data gets written to memory
324 * - then map the RX buffer, so that cache entries (with
325 * soon-to-be-stale data) get removed
326 * use rx buffer in place of tx if tx buffer was not provided
327 * use temp rx buffer (preallocated or realloc to fit) for rx dma
328 */
329 if (t->tx_buf) {
330 if (t->tx_dma == 0) { /* if DMA_ADDR_INVALID, map it */
331 dma_tx_addr = dma_map_single(hw->dev,
332 (void *)t->tx_buf,
333 t->len, DMA_TO_DEVICE);
334 if (dma_mapping_error(hw->dev, dma_tx_addr))
335 dev_err(hw->dev, "tx dma map error\n");
336 }
337 }
338
339 if (t->rx_buf) {
340 if (t->rx_dma == 0) { /* if DMA_ADDR_INVALID, map it */
341 dma_rx_addr = dma_map_single(hw->dev,
342 (void *)t->rx_buf,
343 t->len, DMA_FROM_DEVICE);
344 if (dma_mapping_error(hw->dev, dma_rx_addr))
345 dev_err(hw->dev, "rx dma map error\n");
346 }
347 } else {
348 if (t->len > hw->dma_rx_tmpbuf_size) {
349 int ret;
350
351 au1550_spi_dma_rxtmp_free(hw);
352 ret = au1550_spi_dma_rxtmp_alloc(hw, max(t->len,
353 AU1550_SPI_DMA_RXTMP_MINSIZE));
354 if (ret < 0)
355 return ret;
356 }
357 hw->rx = hw->dma_rx_tmpbuf;
358 dma_rx_addr = hw->dma_rx_tmpbuf_addr;
359 dma_sync_single_for_device(hw->dev, dma_rx_addr,
360 t->len, DMA_FROM_DEVICE);
361 }
362
363 if (!t->tx_buf) {
364 dma_sync_single_for_device(hw->dev, dma_rx_addr,
365 t->len, DMA_BIDIRECTIONAL);
366 hw->tx = hw->rx;
367 }
368
369 /* put buffers on the ring */
370 res = au1xxx_dbdma_put_dest(hw->dma_rx_ch, virt_to_phys(hw->rx),
371 t->len, DDMA_FLAGS_IE);
372 if (!res)
373 dev_err(hw->dev, "rx dma put dest error\n");
374
375 res = au1xxx_dbdma_put_source(hw->dma_tx_ch, virt_to_phys(hw->tx),
376 t->len, DDMA_FLAGS_IE);
377 if (!res)
378 dev_err(hw->dev, "tx dma put source error\n");
379
380 au1xxx_dbdma_start(hw->dma_rx_ch);
381 au1xxx_dbdma_start(hw->dma_tx_ch);
382
383 /* by default enable nearly all events interrupt */
384 hw->regs->psc_spimsk = PSC_SPIMSK_SD;
385 wmb(); /* drain writebuffer */
386
387 /* start the transfer */
388 hw->regs->psc_spipcr = PSC_SPIPCR_MS;
389 wmb(); /* drain writebuffer */
390
391 wait_for_completion(&hw->master_done);
392
393 au1xxx_dbdma_stop(hw->dma_tx_ch);
394 au1xxx_dbdma_stop(hw->dma_rx_ch);
395
396 if (!t->rx_buf) {
397 /* using the temporal preallocated and premapped buffer */
398 dma_sync_single_for_cpu(hw->dev, dma_rx_addr, t->len,
399 DMA_FROM_DEVICE);
400 }
401 /* unmap buffers if mapped above */
402 if (t->rx_buf && t->rx_dma == 0 )
403 dma_unmap_single(hw->dev, dma_rx_addr, t->len,
404 DMA_FROM_DEVICE);
405 if (t->tx_buf && t->tx_dma == 0 )
406 dma_unmap_single(hw->dev, dma_tx_addr, t->len,
407 DMA_TO_DEVICE);
408
409 return hw->rx_count < hw->tx_count ? hw->rx_count : hw->tx_count;
410}
411
412static irqreturn_t au1550_spi_dma_irq_callback(struct au1550_spi *hw)
413{
414 u32 stat, evnt;
415
416 stat = hw->regs->psc_spistat;
417 evnt = hw->regs->psc_spievent;
418 wmb(); /* drain writebuffer */
419 if ((stat & PSC_SPISTAT_DI) == 0) {
420 dev_err(hw->dev, "Unexpected IRQ!\n");
421 return IRQ_NONE;
422 }
423
424 if ((evnt & (PSC_SPIEVNT_MM | PSC_SPIEVNT_RO
425 | PSC_SPIEVNT_RU | PSC_SPIEVNT_TO
426 | PSC_SPIEVNT_TU | PSC_SPIEVNT_SD))
427 != 0) {
428 /*
429 * due to an spi error we consider transfer as done,
430 * so mask all events until before next transfer start
431 * and stop the possibly running dma immediately
432 */
433 au1550_spi_mask_ack_all(hw);
434 au1xxx_dbdma_stop(hw->dma_rx_ch);
435 au1xxx_dbdma_stop(hw->dma_tx_ch);
436
437 /* get number of transferred bytes */
438 hw->rx_count = hw->len - au1xxx_get_dma_residue(hw->dma_rx_ch);
439 hw->tx_count = hw->len - au1xxx_get_dma_residue(hw->dma_tx_ch);
440
441 au1xxx_dbdma_reset(hw->dma_rx_ch);
442 au1xxx_dbdma_reset(hw->dma_tx_ch);
443 au1550_spi_reset_fifos(hw);
444
445 if (evnt == PSC_SPIEVNT_RO)
446 dev_err(hw->dev,
447 "dma transfer: receive FIFO overflow!\n");
448 else
449 dev_err(hw->dev,
450 "dma transfer: unexpected SPI error "
451 "(event=0x%x stat=0x%x)!\n", evnt, stat);
452
453 complete(&hw->master_done);
454 return IRQ_HANDLED;
455 }
456
457 if ((evnt & PSC_SPIEVNT_MD) != 0) {
458 /* transfer completed successfully */
459 au1550_spi_mask_ack_all(hw);
460 hw->rx_count = hw->len;
461 hw->tx_count = hw->len;
462 complete(&hw->master_done);
463 }
464 return IRQ_HANDLED;
465}
466
467
468/* routines to handle different word sizes in pio mode */
469#define AU1550_SPI_RX_WORD(size, mask) \
470static void au1550_spi_rx_word_##size(struct au1550_spi *hw) \
471{ \
472 u32 fifoword = hw->regs->psc_spitxrx & (u32)(mask); \
473 wmb(); /* drain writebuffer */ \
474 if (hw->rx) { \
475 *(u##size *)hw->rx = (u##size)fifoword; \
476 hw->rx += (size) / 8; \
477 } \
478 hw->rx_count += (size) / 8; \
479}
480
481#define AU1550_SPI_TX_WORD(size, mask) \
482static void au1550_spi_tx_word_##size(struct au1550_spi *hw) \
483{ \
484 u32 fifoword = 0; \
485 if (hw->tx) { \
486 fifoword = *(u##size *)hw->tx & (u32)(mask); \
487 hw->tx += (size) / 8; \
488 } \
489 hw->tx_count += (size) / 8; \
490 if (hw->tx_count >= hw->len) \
491 fifoword |= PSC_SPITXRX_LC; \
492 hw->regs->psc_spitxrx = fifoword; \
493 wmb(); /* drain writebuffer */ \
494}
495
496AU1550_SPI_RX_WORD(8,0xff)
497AU1550_SPI_RX_WORD(16,0xffff)
498AU1550_SPI_RX_WORD(32,0xffffff)
499AU1550_SPI_TX_WORD(8,0xff)
500AU1550_SPI_TX_WORD(16,0xffff)
501AU1550_SPI_TX_WORD(32,0xffffff)
502
503static int au1550_spi_pio_txrxb(struct spi_device *spi, struct spi_transfer *t)
504{
505 u32 stat, mask;
506 struct au1550_spi *hw = spi_master_get_devdata(spi->master);
507
508 hw->tx = t->tx_buf;
509 hw->rx = t->rx_buf;
510 hw->len = t->len;
511 hw->tx_count = 0;
512 hw->rx_count = 0;
513
514 /* by default enable nearly all events after filling tx fifo */
515 mask = PSC_SPIMSK_SD;
516
517 /* fill the transmit FIFO */
518 while (hw->tx_count < hw->len) {
519
520 hw->tx_word(hw);
521
522 if (hw->tx_count >= hw->len) {
523 /* mask tx fifo request interrupt as we are done */
524 mask |= PSC_SPIMSK_TR;
525 }
526
527 stat = hw->regs->psc_spistat;
528 wmb(); /* drain writebuffer */
529 if (stat & PSC_SPISTAT_TF)
530 break;
531 }
532
533 /* enable event interrupts */
534 hw->regs->psc_spimsk = mask;
535 wmb(); /* drain writebuffer */
536
537 /* start the transfer */
538 hw->regs->psc_spipcr = PSC_SPIPCR_MS;
539 wmb(); /* drain writebuffer */
540
541 wait_for_completion(&hw->master_done);
542
543 return hw->rx_count < hw->tx_count ? hw->rx_count : hw->tx_count;
544}
545
546static irqreturn_t au1550_spi_pio_irq_callback(struct au1550_spi *hw)
547{
548 int busy;
549 u32 stat, evnt;
550
551 stat = hw->regs->psc_spistat;
552 evnt = hw->regs->psc_spievent;
553 wmb(); /* drain writebuffer */
554 if ((stat & PSC_SPISTAT_DI) == 0) {
555 dev_err(hw->dev, "Unexpected IRQ!\n");
556 return IRQ_NONE;
557 }
558
559 if ((evnt & (PSC_SPIEVNT_MM | PSC_SPIEVNT_RO
560 | PSC_SPIEVNT_RU | PSC_SPIEVNT_TO
561 | PSC_SPIEVNT_SD))
562 != 0) {
563 /*
564 * due to an error we consider transfer as done,
565 * so mask all events until before next transfer start
566 */
567 au1550_spi_mask_ack_all(hw);
568 au1550_spi_reset_fifos(hw);
569 dev_err(hw->dev,
570 "pio transfer: unexpected SPI error "
571 "(event=0x%x stat=0x%x)!\n", evnt, stat);
572 complete(&hw->master_done);
573 return IRQ_HANDLED;
574 }
575
576 /*
577 * while there is something to read from rx fifo
578 * or there is a space to write to tx fifo:
579 */
580 do {
581 busy = 0;
582 stat = hw->regs->psc_spistat;
583 wmb(); /* drain writebuffer */
584
585 /*
586 * Take care to not let the Rx FIFO overflow.
587 *
588 * We only write a byte if we have read one at least. Initially,
589 * the write fifo is full, so we should read from the read fifo
590 * first.
591 * In case we miss a word from the read fifo, we should get a
592 * RO event and should back out.
593 */
594 if (!(stat & PSC_SPISTAT_RE) && hw->rx_count < hw->len) {
595 hw->rx_word(hw);
596 busy = 1;
597
598 if (!(stat & PSC_SPISTAT_TF) && hw->tx_count < hw->len)
599 hw->tx_word(hw);
600 }
601 } while (busy);
602
603 hw->regs->psc_spievent = PSC_SPIEVNT_RR | PSC_SPIEVNT_TR;
604 wmb(); /* drain writebuffer */
605
606 /*
607 * Restart the SPI transmission in case of a transmit underflow.
608 * This seems to work despite the notes in the Au1550 data book
609 * of Figure 8-4 with flowchart for SPI master operation:
610 *
611 * """Note 1: An XFR Error Interrupt occurs, unless masked,
612 * for any of the following events: Tx FIFO Underflow,
613 * Rx FIFO Overflow, or Multiple-master Error
614 * Note 2: In case of a Tx Underflow Error, all zeroes are
615 * transmitted."""
616 *
617 * By simply restarting the spi transfer on Tx Underflow Error,
618 * we assume that spi transfer was paused instead of zeroes
619 * transmittion mentioned in the Note 2 of Au1550 data book.
620 */
621 if (evnt & PSC_SPIEVNT_TU) {
622 hw->regs->psc_spievent = PSC_SPIEVNT_TU | PSC_SPIEVNT_MD;
623 wmb(); /* drain writebuffer */
624 hw->regs->psc_spipcr = PSC_SPIPCR_MS;
625 wmb(); /* drain writebuffer */
626 }
627
628 if (hw->rx_count >= hw->len) {
629 /* transfer completed successfully */
630 au1550_spi_mask_ack_all(hw);
631 complete(&hw->master_done);
632 }
633 return IRQ_HANDLED;
634}
635
636static int au1550_spi_txrx_bufs(struct spi_device *spi, struct spi_transfer *t)
637{
638 struct au1550_spi *hw = spi_master_get_devdata(spi->master);
639 return hw->txrx_bufs(spi, t);
640}
641
642static irqreturn_t au1550_spi_irq(int irq, void *dev)
643{
644 struct au1550_spi *hw = dev;
645 return hw->irq_callback(hw);
646}
647
648static void au1550_spi_bits_handlers_set(struct au1550_spi *hw, int bpw)
649{
650 if (bpw <= 8) {
651 if (hw->usedma) {
652 hw->txrx_bufs = &au1550_spi_dma_txrxb;
653 hw->irq_callback = &au1550_spi_dma_irq_callback;
654 } else {
655 hw->rx_word = &au1550_spi_rx_word_8;
656 hw->tx_word = &au1550_spi_tx_word_8;
657 hw->txrx_bufs = &au1550_spi_pio_txrxb;
658 hw->irq_callback = &au1550_spi_pio_irq_callback;
659 }
660 } else if (bpw <= 16) {
661 hw->rx_word = &au1550_spi_rx_word_16;
662 hw->tx_word = &au1550_spi_tx_word_16;
663 hw->txrx_bufs = &au1550_spi_pio_txrxb;
664 hw->irq_callback = &au1550_spi_pio_irq_callback;
665 } else {
666 hw->rx_word = &au1550_spi_rx_word_32;
667 hw->tx_word = &au1550_spi_tx_word_32;
668 hw->txrx_bufs = &au1550_spi_pio_txrxb;
669 hw->irq_callback = &au1550_spi_pio_irq_callback;
670 }
671}
672
673static void au1550_spi_setup_psc_as_spi(struct au1550_spi *hw)
674{
675 u32 stat, cfg;
676
677 /* set up the PSC for SPI mode */
678 hw->regs->psc_ctrl = PSC_CTRL_DISABLE;
679 wmb(); /* drain writebuffer */
680 hw->regs->psc_sel = PSC_SEL_PS_SPIMODE;
681 wmb(); /* drain writebuffer */
682
683 hw->regs->psc_spicfg = 0;
684 wmb(); /* drain writebuffer */
685
686 hw->regs->psc_ctrl = PSC_CTRL_ENABLE;
687 wmb(); /* drain writebuffer */
688
689 do {
690 stat = hw->regs->psc_spistat;
691 wmb(); /* drain writebuffer */
692 } while ((stat & PSC_SPISTAT_SR) == 0);
693
694
695 cfg = hw->usedma ? 0 : PSC_SPICFG_DD_DISABLE;
696 cfg |= PSC_SPICFG_SET_LEN(8);
697 cfg |= PSC_SPICFG_RT_FIFO8 | PSC_SPICFG_TT_FIFO8;
698 /* use minimal allowed brg and div values as initial setting: */
699 cfg |= PSC_SPICFG_SET_BAUD(4) | PSC_SPICFG_SET_DIV(0);
700
701#ifdef AU1550_SPI_DEBUG_LOOPBACK
702 cfg |= PSC_SPICFG_LB;
703#endif
704
705 hw->regs->psc_spicfg = cfg;
706 wmb(); /* drain writebuffer */
707
708 au1550_spi_mask_ack_all(hw);
709
710 hw->regs->psc_spicfg |= PSC_SPICFG_DE_ENABLE;
711 wmb(); /* drain writebuffer */
712
713 do {
714 stat = hw->regs->psc_spistat;
715 wmb(); /* drain writebuffer */
716 } while ((stat & PSC_SPISTAT_DR) == 0);
717
718 au1550_spi_reset_fifos(hw);
719}
720
721
722static int au1550_spi_probe(struct platform_device *pdev)
723{
724 struct au1550_spi *hw;
725 struct spi_master *master;
726 struct resource *r;
727 int err = 0;
728
729 master = spi_alloc_master(&pdev->dev, sizeof(struct au1550_spi));
730 if (master == NULL) {
731 dev_err(&pdev->dev, "No memory for spi_master\n");
732 err = -ENOMEM;
733 goto err_nomem;
734 }
735
736 /* the spi->mode bits understood by this driver: */
737 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST;
738 master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 24);
739
740 hw = spi_master_get_devdata(master);
741
742 hw->master = master;
743 hw->pdata = dev_get_platdata(&pdev->dev);
744 hw->dev = &pdev->dev;
745
746 if (hw->pdata == NULL) {
747 dev_err(&pdev->dev, "No platform data supplied\n");
748 err = -ENOENT;
749 goto err_no_pdata;
750 }
751
752 r = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
753 if (!r) {
754 dev_err(&pdev->dev, "no IRQ\n");
755 err = -ENODEV;
756 goto err_no_iores;
757 }
758 hw->irq = r->start;
759
760 hw->usedma = 0;
761 r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
762 if (r) {
763 hw->dma_tx_id = r->start;
764 r = platform_get_resource(pdev, IORESOURCE_DMA, 1);
765 if (r) {
766 hw->dma_rx_id = r->start;
767 if (usedma && ddma_memid) {
768 if (pdev->dev.dma_mask == NULL)
769 dev_warn(&pdev->dev, "no dma mask\n");
770 else
771 hw->usedma = 1;
772 }
773 }
774 }
775
776 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
777 if (!r) {
778 dev_err(&pdev->dev, "no mmio resource\n");
779 err = -ENODEV;
780 goto err_no_iores;
781 }
782
783 hw->ioarea = request_mem_region(r->start, sizeof(psc_spi_t),
784 pdev->name);
785 if (!hw->ioarea) {
786 dev_err(&pdev->dev, "Cannot reserve iomem region\n");
787 err = -ENXIO;
788 goto err_no_iores;
789 }
790
791 hw->regs = (psc_spi_t __iomem *)ioremap(r->start, sizeof(psc_spi_t));
792 if (!hw->regs) {
793 dev_err(&pdev->dev, "cannot ioremap\n");
794 err = -ENXIO;
795 goto err_ioremap;
796 }
797
798 platform_set_drvdata(pdev, hw);
799
800 init_completion(&hw->master_done);
801
802 hw->bitbang.master = hw->master;
803 hw->bitbang.setup_transfer = au1550_spi_setupxfer;
804 hw->bitbang.chipselect = au1550_spi_chipsel;
805 hw->bitbang.txrx_bufs = au1550_spi_txrx_bufs;
806
807 if (hw->usedma) {
808 hw->dma_tx_ch = au1xxx_dbdma_chan_alloc(ddma_memid,
809 hw->dma_tx_id, NULL, (void *)hw);
810 if (hw->dma_tx_ch == 0) {
811 dev_err(&pdev->dev,
812 "Cannot allocate tx dma channel\n");
813 err = -ENXIO;
814 goto err_no_txdma;
815 }
816 au1xxx_dbdma_set_devwidth(hw->dma_tx_ch, 8);
817 if (au1xxx_dbdma_ring_alloc(hw->dma_tx_ch,
818 AU1550_SPI_DBDMA_DESCRIPTORS) == 0) {
819 dev_err(&pdev->dev,
820 "Cannot allocate tx dma descriptors\n");
821 err = -ENXIO;
822 goto err_no_txdma_descr;
823 }
824
825
826 hw->dma_rx_ch = au1xxx_dbdma_chan_alloc(hw->dma_rx_id,
827 ddma_memid, NULL, (void *)hw);
828 if (hw->dma_rx_ch == 0) {
829 dev_err(&pdev->dev,
830 "Cannot allocate rx dma channel\n");
831 err = -ENXIO;
832 goto err_no_rxdma;
833 }
834 au1xxx_dbdma_set_devwidth(hw->dma_rx_ch, 8);
835 if (au1xxx_dbdma_ring_alloc(hw->dma_rx_ch,
836 AU1550_SPI_DBDMA_DESCRIPTORS) == 0) {
837 dev_err(&pdev->dev,
838 "Cannot allocate rx dma descriptors\n");
839 err = -ENXIO;
840 goto err_no_rxdma_descr;
841 }
842
843 err = au1550_spi_dma_rxtmp_alloc(hw,
844 AU1550_SPI_DMA_RXTMP_MINSIZE);
845 if (err < 0) {
846 dev_err(&pdev->dev,
847 "Cannot allocate initial rx dma tmp buffer\n");
848 goto err_dma_rxtmp_alloc;
849 }
850 }
851
852 au1550_spi_bits_handlers_set(hw, 8);
853
854 err = request_irq(hw->irq, au1550_spi_irq, 0, pdev->name, hw);
855 if (err) {
856 dev_err(&pdev->dev, "Cannot claim IRQ\n");
857 goto err_no_irq;
858 }
859
860 master->bus_num = pdev->id;
861 master->num_chipselect = hw->pdata->num_chipselect;
862
863 /*
864 * precompute valid range for spi freq - from au1550 datasheet:
865 * psc_tempclk = psc_mainclk / (2 << DIV)
866 * spiclk = psc_tempclk / (2 * (BRG + 1))
867 * BRG valid range is 4..63
868 * DIV valid range is 0..3
869 * round the min and max frequencies to values that would still
870 * produce valid brg and div
871 */
872 {
873 int min_div = (2 << 0) * (2 * (4 + 1));
874 int max_div = (2 << 3) * (2 * (63 + 1));
875 master->max_speed_hz = hw->pdata->mainclk_hz / min_div;
876 master->min_speed_hz =
877 hw->pdata->mainclk_hz / (max_div + 1) + 1;
878 }
879
880 au1550_spi_setup_psc_as_spi(hw);
881
882 err = spi_bitbang_start(&hw->bitbang);
883 if (err) {
884 dev_err(&pdev->dev, "Failed to register SPI master\n");
885 goto err_register;
886 }
887
888 dev_info(&pdev->dev,
889 "spi master registered: bus_num=%d num_chipselect=%d\n",
890 master->bus_num, master->num_chipselect);
891
892 return 0;
893
894err_register:
895 free_irq(hw->irq, hw);
896
897err_no_irq:
898 au1550_spi_dma_rxtmp_free(hw);
899
900err_dma_rxtmp_alloc:
901err_no_rxdma_descr:
902 if (hw->usedma)
903 au1xxx_dbdma_chan_free(hw->dma_rx_ch);
904
905err_no_rxdma:
906err_no_txdma_descr:
907 if (hw->usedma)
908 au1xxx_dbdma_chan_free(hw->dma_tx_ch);
909
910err_no_txdma:
911 iounmap((void __iomem *)hw->regs);
912
913err_ioremap:
914 release_mem_region(r->start, sizeof(psc_spi_t));
915
916err_no_iores:
917err_no_pdata:
918 spi_master_put(hw->master);
919
920err_nomem:
921 return err;
922}
923
924static int au1550_spi_remove(struct platform_device *pdev)
925{
926 struct au1550_spi *hw = platform_get_drvdata(pdev);
927
928 dev_info(&pdev->dev, "spi master remove: bus_num=%d\n",
929 hw->master->bus_num);
930
931 spi_bitbang_stop(&hw->bitbang);
932 free_irq(hw->irq, hw);
933 iounmap((void __iomem *)hw->regs);
934 release_mem_region(hw->ioarea->start, sizeof(psc_spi_t));
935
936 if (hw->usedma) {
937 au1550_spi_dma_rxtmp_free(hw);
938 au1xxx_dbdma_chan_free(hw->dma_rx_ch);
939 au1xxx_dbdma_chan_free(hw->dma_tx_ch);
940 }
941
942 spi_master_put(hw->master);
943 return 0;
944}
945
946/* work with hotplug and coldplug */
947MODULE_ALIAS("platform:au1550-spi");
948
949static struct platform_driver au1550_spi_drv = {
950 .probe = au1550_spi_probe,
951 .remove = au1550_spi_remove,
952 .driver = {
953 .name = "au1550-spi",
954 },
955};
956
957static int __init au1550_spi_init(void)
958{
959 /*
960 * create memory device with 8 bits dev_devwidth
961 * needed for proper byte ordering to spi fifo
962 */
963 switch (alchemy_get_cputype()) {
964 case ALCHEMY_CPU_AU1550:
965 case ALCHEMY_CPU_AU1200:
966 case ALCHEMY_CPU_AU1300:
967 break;
968 default:
969 return -ENODEV;
970 }
971
972 if (usedma) {
973 ddma_memid = au1xxx_ddma_add_device(&au1550_spi_mem_dbdev);
974 if (!ddma_memid)
975 printk(KERN_ERR "au1550-spi: cannot add memory"
976 "dbdma device\n");
977 }
978 return platform_driver_register(&au1550_spi_drv);
979}
980module_init(au1550_spi_init);
981
982static void __exit au1550_spi_exit(void)
983{
984 if (usedma && ddma_memid)
985 au1xxx_ddma_del_device(ddma_memid);
986 platform_driver_unregister(&au1550_spi_drv);
987}
988module_exit(au1550_spi_exit);
989
990MODULE_DESCRIPTION("Au1550 PSC SPI Driver");
991MODULE_AUTHOR("Jan Nikitenko <jan.nikitenko@gmail.com>");
992MODULE_LICENSE("GPL");