Commit | Line | Data |
---|---|---|
63bd2359 | 1 | /* |
ca632f55 | 2 | * au1550 psc spi controller driver |
63bd2359 JN |
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> | |
5a0e3ad6 | 26 | #include <linux/slab.h> |
63bd2359 | 27 | #include <linux/errno.h> |
d7614de4 | 28 | #include <linux/module.h> |
63bd2359 JN |
29 | #include <linux/device.h> |
30 | #include <linux/platform_device.h> | |
3a93a159 | 31 | #include <linux/resource.h> |
63bd2359 JN |
32 | #include <linux/spi/spi.h> |
33 | #include <linux/spi/spi_bitbang.h> | |
34 | #include <linux/dma-mapping.h> | |
35 | #include <linux/completion.h> | |
36 | #include <asm/mach-au1x00/au1000.h> | |
37 | #include <asm/mach-au1x00/au1xxx_psc.h> | |
38 | #include <asm/mach-au1x00/au1xxx_dbdma.h> | |
39 | ||
40 | #include <asm/mach-au1x00/au1550_spi.h> | |
41 | ||
42 | static unsigned usedma = 1; | |
43 | module_param(usedma, uint, 0644); | |
44 | ||
45 | /* | |
46 | #define AU1550_SPI_DEBUG_LOOPBACK | |
47 | */ | |
48 | ||
49 | ||
50 | #define AU1550_SPI_DBDMA_DESCRIPTORS 1 | |
51 | #define AU1550_SPI_DMA_RXTMP_MINSIZE 2048U | |
52 | ||
53 | struct au1550_spi { | |
54 | struct spi_bitbang bitbang; | |
55 | ||
56 | volatile psc_spi_t __iomem *regs; | |
57 | int irq; | |
58 | unsigned freq_max; | |
59 | unsigned freq_min; | |
60 | ||
61 | unsigned len; | |
62 | unsigned tx_count; | |
63 | unsigned rx_count; | |
64 | const u8 *tx; | |
65 | u8 *rx; | |
66 | ||
67 | void (*rx_word)(struct au1550_spi *hw); | |
68 | void (*tx_word)(struct au1550_spi *hw); | |
69 | int (*txrx_bufs)(struct spi_device *spi, struct spi_transfer *t); | |
70 | irqreturn_t (*irq_callback)(struct au1550_spi *hw); | |
71 | ||
72 | struct completion master_done; | |
73 | ||
74 | unsigned usedma; | |
75 | u32 dma_tx_id; | |
76 | u32 dma_rx_id; | |
77 | u32 dma_tx_ch; | |
78 | u32 dma_rx_ch; | |
79 | ||
80 | u8 *dma_rx_tmpbuf; | |
81 | unsigned dma_rx_tmpbuf_size; | |
82 | u32 dma_rx_tmpbuf_addr; | |
83 | ||
84 | struct spi_master *master; | |
85 | struct device *dev; | |
86 | struct au1550_spi_info *pdata; | |
3a93a159 | 87 | struct resource *ioarea; |
63bd2359 JN |
88 | }; |
89 | ||
90 | ||
91 | /* we use an 8-bit memory device for dma transfers to/from spi fifo */ | |
92 | static dbdev_tab_t au1550_spi_mem_dbdev = | |
93 | { | |
94 | .dev_id = DBDMA_MEM_CHAN, | |
95 | .dev_flags = DEV_FLAGS_ANYUSE|DEV_FLAGS_SYNC, | |
96 | .dev_tsize = 0, | |
97 | .dev_devwidth = 8, | |
98 | .dev_physaddr = 0x00000000, | |
99 | .dev_intlevel = 0, | |
100 | .dev_intpolarity = 0 | |
101 | }; | |
102 | ||
3a93a159 ML |
103 | static int ddma_memid; /* id to above mem dma device */ |
104 | ||
63bd2359 JN |
105 | static void au1550_spi_bits_handlers_set(struct au1550_spi *hw, int bpw); |
106 | ||
107 | ||
40369e1c | 108 | /* |
63bd2359 JN |
109 | * compute BRG and DIV bits to setup spi clock based on main input clock rate |
110 | * that was specified in platform data structure | |
111 | * according to au1550 datasheet: | |
112 | * psc_tempclk = psc_mainclk / (2 << DIV) | |
113 | * spiclk = psc_tempclk / (2 * (BRG + 1)) | |
114 | * BRG valid range is 4..63 | |
115 | * DIV valid range is 0..3 | |
116 | */ | |
117 | static u32 au1550_spi_baudcfg(struct au1550_spi *hw, unsigned speed_hz) | |
118 | { | |
119 | u32 mainclk_hz = hw->pdata->mainclk_hz; | |
120 | u32 div, brg; | |
121 | ||
122 | for (div = 0; div < 4; div++) { | |
123 | brg = mainclk_hz / speed_hz / (4 << div); | |
124 | /* now we have BRG+1 in brg, so count with that */ | |
125 | if (brg < (4 + 1)) { | |
126 | brg = (4 + 1); /* speed_hz too big */ | |
127 | break; /* set lowest brg (div is == 0) */ | |
128 | } | |
129 | if (brg <= (63 + 1)) | |
130 | break; /* we have valid brg and div */ | |
131 | } | |
132 | if (div == 4) { | |
133 | div = 3; /* speed_hz too small */ | |
134 | brg = (63 + 1); /* set highest brg and div */ | |
135 | } | |
136 | brg--; | |
137 | return PSC_SPICFG_SET_BAUD(brg) | PSC_SPICFG_SET_DIV(div); | |
138 | } | |
139 | ||
140 | static inline void au1550_spi_mask_ack_all(struct au1550_spi *hw) | |
141 | { | |
142 | hw->regs->psc_spimsk = | |
143 | PSC_SPIMSK_MM | PSC_SPIMSK_RR | PSC_SPIMSK_RO | |
144 | | PSC_SPIMSK_RU | PSC_SPIMSK_TR | PSC_SPIMSK_TO | |
145 | | PSC_SPIMSK_TU | PSC_SPIMSK_SD | PSC_SPIMSK_MD; | |
146 | au_sync(); | |
147 | ||
148 | hw->regs->psc_spievent = | |
149 | PSC_SPIEVNT_MM | PSC_SPIEVNT_RR | PSC_SPIEVNT_RO | |
150 | | PSC_SPIEVNT_RU | PSC_SPIEVNT_TR | PSC_SPIEVNT_TO | |
151 | | PSC_SPIEVNT_TU | PSC_SPIEVNT_SD | PSC_SPIEVNT_MD; | |
152 | au_sync(); | |
153 | } | |
154 | ||
155 | static void au1550_spi_reset_fifos(struct au1550_spi *hw) | |
156 | { | |
157 | u32 pcr; | |
158 | ||
159 | hw->regs->psc_spipcr = PSC_SPIPCR_RC | PSC_SPIPCR_TC; | |
160 | au_sync(); | |
161 | do { | |
162 | pcr = hw->regs->psc_spipcr; | |
163 | au_sync(); | |
164 | } while (pcr != 0); | |
165 | } | |
166 | ||
167 | /* | |
168 | * dma transfers are used for the most common spi word size of 8-bits | |
169 | * we cannot easily change already set up dma channels' width, so if we wanted | |
170 | * dma support for more than 8-bit words (up to 24 bits), we would need to | |
171 | * setup dma channels from scratch on each spi transfer, based on bits_per_word | |
172 | * instead we have pre set up 8 bit dma channels supporting spi 4 to 8 bits | |
173 | * transfers, and 9 to 24 bits spi transfers will be done in pio irq based mode | |
174 | * callbacks to handle dma or pio are set up in au1550_spi_bits_handlers_set() | |
175 | */ | |
176 | static void au1550_spi_chipsel(struct spi_device *spi, int value) | |
177 | { | |
178 | struct au1550_spi *hw = spi_master_get_devdata(spi->master); | |
179 | unsigned cspol = spi->mode & SPI_CS_HIGH ? 1 : 0; | |
180 | u32 cfg, stat; | |
181 | ||
182 | switch (value) { | |
183 | case BITBANG_CS_INACTIVE: | |
184 | if (hw->pdata->deactivate_cs) | |
185 | hw->pdata->deactivate_cs(hw->pdata, spi->chip_select, | |
186 | cspol); | |
187 | break; | |
188 | ||
189 | case BITBANG_CS_ACTIVE: | |
190 | au1550_spi_bits_handlers_set(hw, spi->bits_per_word); | |
191 | ||
192 | cfg = hw->regs->psc_spicfg; | |
193 | au_sync(); | |
194 | hw->regs->psc_spicfg = cfg & ~PSC_SPICFG_DE_ENABLE; | |
195 | au_sync(); | |
196 | ||
197 | if (spi->mode & SPI_CPOL) | |
198 | cfg |= PSC_SPICFG_BI; | |
199 | else | |
200 | cfg &= ~PSC_SPICFG_BI; | |
201 | if (spi->mode & SPI_CPHA) | |
202 | cfg &= ~PSC_SPICFG_CDE; | |
203 | else | |
204 | cfg |= PSC_SPICFG_CDE; | |
205 | ||
206 | if (spi->mode & SPI_LSB_FIRST) | |
207 | cfg |= PSC_SPICFG_MLF; | |
208 | else | |
209 | cfg &= ~PSC_SPICFG_MLF; | |
210 | ||
211 | if (hw->usedma && spi->bits_per_word <= 8) | |
212 | cfg &= ~PSC_SPICFG_DD_DISABLE; | |
213 | else | |
214 | cfg |= PSC_SPICFG_DD_DISABLE; | |
215 | cfg = PSC_SPICFG_CLR_LEN(cfg); | |
216 | cfg |= PSC_SPICFG_SET_LEN(spi->bits_per_word); | |
217 | ||
218 | cfg = PSC_SPICFG_CLR_BAUD(cfg); | |
219 | cfg &= ~PSC_SPICFG_SET_DIV(3); | |
220 | cfg |= au1550_spi_baudcfg(hw, spi->max_speed_hz); | |
221 | ||
222 | hw->regs->psc_spicfg = cfg | PSC_SPICFG_DE_ENABLE; | |
223 | au_sync(); | |
224 | do { | |
225 | stat = hw->regs->psc_spistat; | |
226 | au_sync(); | |
227 | } while ((stat & PSC_SPISTAT_DR) == 0); | |
228 | ||
229 | if (hw->pdata->activate_cs) | |
230 | hw->pdata->activate_cs(hw->pdata, spi->chip_select, | |
231 | cspol); | |
232 | break; | |
233 | } | |
234 | } | |
235 | ||
236 | static int au1550_spi_setupxfer(struct spi_device *spi, struct spi_transfer *t) | |
237 | { | |
238 | struct au1550_spi *hw = spi_master_get_devdata(spi->master); | |
239 | unsigned bpw, hz; | |
240 | u32 cfg, stat; | |
241 | ||
04ba24b3 JN |
242 | bpw = spi->bits_per_word; |
243 | hz = spi->max_speed_hz; | |
244 | if (t) { | |
245 | if (t->bits_per_word) | |
246 | bpw = t->bits_per_word; | |
247 | if (t->speed_hz) | |
248 | hz = t->speed_hz; | |
249 | } | |
63bd2359 JN |
250 | |
251 | if (bpw < 4 || bpw > 24) { | |
252 | dev_err(&spi->dev, "setupxfer: invalid bits_per_word=%d\n", | |
253 | bpw); | |
254 | return -EINVAL; | |
255 | } | |
256 | if (hz > spi->max_speed_hz || hz > hw->freq_max || hz < hw->freq_min) { | |
257 | dev_err(&spi->dev, "setupxfer: clock rate=%d out of range\n", | |
258 | hz); | |
259 | return -EINVAL; | |
260 | } | |
261 | ||
262 | au1550_spi_bits_handlers_set(hw, spi->bits_per_word); | |
263 | ||
264 | cfg = hw->regs->psc_spicfg; | |
265 | au_sync(); | |
266 | hw->regs->psc_spicfg = cfg & ~PSC_SPICFG_DE_ENABLE; | |
267 | au_sync(); | |
268 | ||
269 | if (hw->usedma && bpw <= 8) | |
270 | cfg &= ~PSC_SPICFG_DD_DISABLE; | |
271 | else | |
272 | cfg |= PSC_SPICFG_DD_DISABLE; | |
273 | cfg = PSC_SPICFG_CLR_LEN(cfg); | |
274 | cfg |= PSC_SPICFG_SET_LEN(bpw); | |
275 | ||
276 | cfg = PSC_SPICFG_CLR_BAUD(cfg); | |
277 | cfg &= ~PSC_SPICFG_SET_DIV(3); | |
278 | cfg |= au1550_spi_baudcfg(hw, hz); | |
279 | ||
280 | hw->regs->psc_spicfg = cfg; | |
281 | au_sync(); | |
282 | ||
283 | if (cfg & PSC_SPICFG_DE_ENABLE) { | |
284 | do { | |
285 | stat = hw->regs->psc_spistat; | |
286 | au_sync(); | |
287 | } while ((stat & PSC_SPISTAT_DR) == 0); | |
288 | } | |
289 | ||
290 | au1550_spi_reset_fifos(hw); | |
291 | au1550_spi_mask_ack_all(hw); | |
292 | return 0; | |
293 | } | |
294 | ||
295 | static int au1550_spi_setup(struct spi_device *spi) | |
296 | { | |
297 | struct au1550_spi *hw = spi_master_get_devdata(spi->master); | |
298 | ||
63bd2359 JN |
299 | if (spi->bits_per_word < 4 || spi->bits_per_word > 24) { |
300 | dev_err(&spi->dev, "setup: invalid bits_per_word=%d\n", | |
301 | spi->bits_per_word); | |
302 | return -EINVAL; | |
303 | } | |
304 | ||
305 | if (spi->max_speed_hz == 0) | |
306 | spi->max_speed_hz = hw->freq_max; | |
307 | if (spi->max_speed_hz > hw->freq_max | |
308 | || spi->max_speed_hz < hw->freq_min) | |
309 | return -EINVAL; | |
310 | /* | |
311 | * NOTE: cannot change speed and other hw settings immediately, | |
312 | * otherwise sharing of spi bus is not possible, | |
313 | * so do not call setupxfer(spi, NULL) here | |
314 | */ | |
315 | return 0; | |
316 | } | |
317 | ||
318 | /* | |
319 | * for dma spi transfers, we have to setup rx channel, otherwise there is | |
320 | * no reliable way how to recognize that spi transfer is done | |
321 | * dma complete callbacks are called before real spi transfer is finished | |
322 | * and if only tx dma channel is set up (and rx fifo overflow event masked) | |
323 | * spi master done event irq is not generated unless rx fifo is empty (emptied) | |
324 | * so we need rx tmp buffer to use for rx dma if user does not provide one | |
325 | */ | |
326 | static int au1550_spi_dma_rxtmp_alloc(struct au1550_spi *hw, unsigned size) | |
327 | { | |
328 | hw->dma_rx_tmpbuf = kmalloc(size, GFP_KERNEL); | |
329 | if (!hw->dma_rx_tmpbuf) | |
330 | return -ENOMEM; | |
331 | hw->dma_rx_tmpbuf_size = size; | |
332 | hw->dma_rx_tmpbuf_addr = dma_map_single(hw->dev, hw->dma_rx_tmpbuf, | |
333 | size, DMA_FROM_DEVICE); | |
8d8bb39b | 334 | if (dma_mapping_error(hw->dev, hw->dma_rx_tmpbuf_addr)) { |
63bd2359 JN |
335 | kfree(hw->dma_rx_tmpbuf); |
336 | hw->dma_rx_tmpbuf = 0; | |
337 | hw->dma_rx_tmpbuf_size = 0; | |
338 | return -EFAULT; | |
339 | } | |
340 | return 0; | |
341 | } | |
342 | ||
343 | static void au1550_spi_dma_rxtmp_free(struct au1550_spi *hw) | |
344 | { | |
345 | dma_unmap_single(hw->dev, hw->dma_rx_tmpbuf_addr, | |
346 | hw->dma_rx_tmpbuf_size, DMA_FROM_DEVICE); | |
347 | kfree(hw->dma_rx_tmpbuf); | |
348 | hw->dma_rx_tmpbuf = 0; | |
349 | hw->dma_rx_tmpbuf_size = 0; | |
350 | } | |
351 | ||
352 | static int au1550_spi_dma_txrxb(struct spi_device *spi, struct spi_transfer *t) | |
353 | { | |
354 | struct au1550_spi *hw = spi_master_get_devdata(spi->master); | |
355 | dma_addr_t dma_tx_addr; | |
356 | dma_addr_t dma_rx_addr; | |
357 | u32 res; | |
358 | ||
359 | hw->len = t->len; | |
360 | hw->tx_count = 0; | |
361 | hw->rx_count = 0; | |
362 | ||
363 | hw->tx = t->tx_buf; | |
364 | hw->rx = t->rx_buf; | |
365 | dma_tx_addr = t->tx_dma; | |
366 | dma_rx_addr = t->rx_dma; | |
367 | ||
368 | /* | |
4e253d23 JN |
369 | * check if buffers are already dma mapped, map them otherwise: |
370 | * - first map the TX buffer, so cache data gets written to memory | |
371 | * - then map the RX buffer, so that cache entries (with | |
372 | * soon-to-be-stale data) get removed | |
63bd2359 JN |
373 | * use rx buffer in place of tx if tx buffer was not provided |
374 | * use temp rx buffer (preallocated or realloc to fit) for rx dma | |
375 | */ | |
4e253d23 JN |
376 | if (t->tx_buf) { |
377 | if (t->tx_dma == 0) { /* if DMA_ADDR_INVALID, map it */ | |
378 | dma_tx_addr = dma_map_single(hw->dev, | |
379 | (void *)t->tx_buf, | |
380 | t->len, DMA_TO_DEVICE); | |
381 | if (dma_mapping_error(hw->dev, dma_tx_addr)) | |
382 | dev_err(hw->dev, "tx dma map error\n"); | |
383 | } | |
384 | } | |
385 | ||
63bd2359 JN |
386 | if (t->rx_buf) { |
387 | if (t->rx_dma == 0) { /* if DMA_ADDR_INVALID, map it */ | |
388 | dma_rx_addr = dma_map_single(hw->dev, | |
389 | (void *)t->rx_buf, | |
390 | t->len, DMA_FROM_DEVICE); | |
8d8bb39b | 391 | if (dma_mapping_error(hw->dev, dma_rx_addr)) |
63bd2359 JN |
392 | dev_err(hw->dev, "rx dma map error\n"); |
393 | } | |
394 | } else { | |
395 | if (t->len > hw->dma_rx_tmpbuf_size) { | |
396 | int ret; | |
397 | ||
398 | au1550_spi_dma_rxtmp_free(hw); | |
399 | ret = au1550_spi_dma_rxtmp_alloc(hw, max(t->len, | |
400 | AU1550_SPI_DMA_RXTMP_MINSIZE)); | |
401 | if (ret < 0) | |
402 | return ret; | |
403 | } | |
404 | hw->rx = hw->dma_rx_tmpbuf; | |
405 | dma_rx_addr = hw->dma_rx_tmpbuf_addr; | |
406 | dma_sync_single_for_device(hw->dev, dma_rx_addr, | |
407 | t->len, DMA_FROM_DEVICE); | |
408 | } | |
4e253d23 JN |
409 | |
410 | if (!t->tx_buf) { | |
63bd2359 JN |
411 | dma_sync_single_for_device(hw->dev, dma_rx_addr, |
412 | t->len, DMA_BIDIRECTIONAL); | |
413 | hw->tx = hw->rx; | |
414 | } | |
415 | ||
416 | /* put buffers on the ring */ | |
963accbc | 417 | res = au1xxx_dbdma_put_dest(hw->dma_rx_ch, virt_to_phys(hw->rx), |
ea071cc7 | 418 | t->len, DDMA_FLAGS_IE); |
63bd2359 JN |
419 | if (!res) |
420 | dev_err(hw->dev, "rx dma put dest error\n"); | |
421 | ||
963accbc | 422 | res = au1xxx_dbdma_put_source(hw->dma_tx_ch, virt_to_phys(hw->tx), |
ea071cc7 | 423 | t->len, DDMA_FLAGS_IE); |
63bd2359 JN |
424 | if (!res) |
425 | dev_err(hw->dev, "tx dma put source error\n"); | |
426 | ||
427 | au1xxx_dbdma_start(hw->dma_rx_ch); | |
428 | au1xxx_dbdma_start(hw->dma_tx_ch); | |
429 | ||
430 | /* by default enable nearly all events interrupt */ | |
431 | hw->regs->psc_spimsk = PSC_SPIMSK_SD; | |
432 | au_sync(); | |
433 | ||
434 | /* start the transfer */ | |
435 | hw->regs->psc_spipcr = PSC_SPIPCR_MS; | |
436 | au_sync(); | |
437 | ||
438 | wait_for_completion(&hw->master_done); | |
439 | ||
440 | au1xxx_dbdma_stop(hw->dma_tx_ch); | |
441 | au1xxx_dbdma_stop(hw->dma_rx_ch); | |
442 | ||
443 | if (!t->rx_buf) { | |
444 | /* using the temporal preallocated and premapped buffer */ | |
445 | dma_sync_single_for_cpu(hw->dev, dma_rx_addr, t->len, | |
446 | DMA_FROM_DEVICE); | |
447 | } | |
448 | /* unmap buffers if mapped above */ | |
449 | if (t->rx_buf && t->rx_dma == 0 ) | |
450 | dma_unmap_single(hw->dev, dma_rx_addr, t->len, | |
451 | DMA_FROM_DEVICE); | |
452 | if (t->tx_buf && t->tx_dma == 0 ) | |
453 | dma_unmap_single(hw->dev, dma_tx_addr, t->len, | |
454 | DMA_TO_DEVICE); | |
455 | ||
456 | return hw->rx_count < hw->tx_count ? hw->rx_count : hw->tx_count; | |
457 | } | |
458 | ||
459 | static irqreturn_t au1550_spi_dma_irq_callback(struct au1550_spi *hw) | |
460 | { | |
461 | u32 stat, evnt; | |
462 | ||
463 | stat = hw->regs->psc_spistat; | |
464 | evnt = hw->regs->psc_spievent; | |
465 | au_sync(); | |
466 | if ((stat & PSC_SPISTAT_DI) == 0) { | |
467 | dev_err(hw->dev, "Unexpected IRQ!\n"); | |
468 | return IRQ_NONE; | |
469 | } | |
470 | ||
471 | if ((evnt & (PSC_SPIEVNT_MM | PSC_SPIEVNT_RO | |
472 | | PSC_SPIEVNT_RU | PSC_SPIEVNT_TO | |
473 | | PSC_SPIEVNT_TU | PSC_SPIEVNT_SD)) | |
474 | != 0) { | |
475 | /* | |
476 | * due to an spi error we consider transfer as done, | |
477 | * so mask all events until before next transfer start | |
886db6ac | 478 | * and stop the possibly running dma immediately |
63bd2359 JN |
479 | */ |
480 | au1550_spi_mask_ack_all(hw); | |
481 | au1xxx_dbdma_stop(hw->dma_rx_ch); | |
482 | au1xxx_dbdma_stop(hw->dma_tx_ch); | |
483 | ||
25985edc | 484 | /* get number of transferred bytes */ |
63bd2359 JN |
485 | hw->rx_count = hw->len - au1xxx_get_dma_residue(hw->dma_rx_ch); |
486 | hw->tx_count = hw->len - au1xxx_get_dma_residue(hw->dma_tx_ch); | |
487 | ||
488 | au1xxx_dbdma_reset(hw->dma_rx_ch); | |
489 | au1xxx_dbdma_reset(hw->dma_tx_ch); | |
490 | au1550_spi_reset_fifos(hw); | |
491 | ||
bbe48ecc JN |
492 | if (evnt == PSC_SPIEVNT_RO) |
493 | dev_err(hw->dev, | |
494 | "dma transfer: receive FIFO overflow!\n"); | |
495 | else | |
496 | dev_err(hw->dev, | |
497 | "dma transfer: unexpected SPI error " | |
498 | "(event=0x%x stat=0x%x)!\n", evnt, stat); | |
63bd2359 JN |
499 | |
500 | complete(&hw->master_done); | |
501 | return IRQ_HANDLED; | |
502 | } | |
503 | ||
504 | if ((evnt & PSC_SPIEVNT_MD) != 0) { | |
505 | /* transfer completed successfully */ | |
506 | au1550_spi_mask_ack_all(hw); | |
507 | hw->rx_count = hw->len; | |
508 | hw->tx_count = hw->len; | |
509 | complete(&hw->master_done); | |
510 | } | |
511 | return IRQ_HANDLED; | |
512 | } | |
513 | ||
514 | ||
515 | /* routines to handle different word sizes in pio mode */ | |
516 | #define AU1550_SPI_RX_WORD(size, mask) \ | |
517 | static void au1550_spi_rx_word_##size(struct au1550_spi *hw) \ | |
518 | { \ | |
519 | u32 fifoword = hw->regs->psc_spitxrx & (u32)(mask); \ | |
520 | au_sync(); \ | |
521 | if (hw->rx) { \ | |
522 | *(u##size *)hw->rx = (u##size)fifoword; \ | |
523 | hw->rx += (size) / 8; \ | |
524 | } \ | |
525 | hw->rx_count += (size) / 8; \ | |
526 | } | |
527 | ||
528 | #define AU1550_SPI_TX_WORD(size, mask) \ | |
529 | static void au1550_spi_tx_word_##size(struct au1550_spi *hw) \ | |
530 | { \ | |
531 | u32 fifoword = 0; \ | |
532 | if (hw->tx) { \ | |
533 | fifoword = *(u##size *)hw->tx & (u32)(mask); \ | |
534 | hw->tx += (size) / 8; \ | |
535 | } \ | |
536 | hw->tx_count += (size) / 8; \ | |
537 | if (hw->tx_count >= hw->len) \ | |
538 | fifoword |= PSC_SPITXRX_LC; \ | |
539 | hw->regs->psc_spitxrx = fifoword; \ | |
540 | au_sync(); \ | |
541 | } | |
542 | ||
543 | AU1550_SPI_RX_WORD(8,0xff) | |
544 | AU1550_SPI_RX_WORD(16,0xffff) | |
545 | AU1550_SPI_RX_WORD(32,0xffffff) | |
546 | AU1550_SPI_TX_WORD(8,0xff) | |
547 | AU1550_SPI_TX_WORD(16,0xffff) | |
548 | AU1550_SPI_TX_WORD(32,0xffffff) | |
549 | ||
550 | static int au1550_spi_pio_txrxb(struct spi_device *spi, struct spi_transfer *t) | |
551 | { | |
552 | u32 stat, mask; | |
553 | struct au1550_spi *hw = spi_master_get_devdata(spi->master); | |
554 | ||
555 | hw->tx = t->tx_buf; | |
556 | hw->rx = t->rx_buf; | |
557 | hw->len = t->len; | |
558 | hw->tx_count = 0; | |
559 | hw->rx_count = 0; | |
560 | ||
561 | /* by default enable nearly all events after filling tx fifo */ | |
562 | mask = PSC_SPIMSK_SD; | |
563 | ||
564 | /* fill the transmit FIFO */ | |
565 | while (hw->tx_count < hw->len) { | |
566 | ||
567 | hw->tx_word(hw); | |
568 | ||
569 | if (hw->tx_count >= hw->len) { | |
570 | /* mask tx fifo request interrupt as we are done */ | |
571 | mask |= PSC_SPIMSK_TR; | |
572 | } | |
573 | ||
574 | stat = hw->regs->psc_spistat; | |
575 | au_sync(); | |
576 | if (stat & PSC_SPISTAT_TF) | |
577 | break; | |
578 | } | |
579 | ||
580 | /* enable event interrupts */ | |
581 | hw->regs->psc_spimsk = mask; | |
582 | au_sync(); | |
583 | ||
584 | /* start the transfer */ | |
585 | hw->regs->psc_spipcr = PSC_SPIPCR_MS; | |
586 | au_sync(); | |
587 | ||
588 | wait_for_completion(&hw->master_done); | |
589 | ||
590 | return hw->rx_count < hw->tx_count ? hw->rx_count : hw->tx_count; | |
591 | } | |
592 | ||
593 | static irqreturn_t au1550_spi_pio_irq_callback(struct au1550_spi *hw) | |
594 | { | |
595 | int busy; | |
596 | u32 stat, evnt; | |
597 | ||
598 | stat = hw->regs->psc_spistat; | |
599 | evnt = hw->regs->psc_spievent; | |
600 | au_sync(); | |
601 | if ((stat & PSC_SPISTAT_DI) == 0) { | |
602 | dev_err(hw->dev, "Unexpected IRQ!\n"); | |
603 | return IRQ_NONE; | |
604 | } | |
605 | ||
606 | if ((evnt & (PSC_SPIEVNT_MM | PSC_SPIEVNT_RO | |
607 | | PSC_SPIEVNT_RU | PSC_SPIEVNT_TO | |
bbe48ecc | 608 | | PSC_SPIEVNT_SD)) |
63bd2359 | 609 | != 0) { |
63bd2359 JN |
610 | /* |
611 | * due to an error we consider transfer as done, | |
612 | * so mask all events until before next transfer start | |
613 | */ | |
614 | au1550_spi_mask_ack_all(hw); | |
615 | au1550_spi_reset_fifos(hw); | |
bbe48ecc JN |
616 | dev_err(hw->dev, |
617 | "pio transfer: unexpected SPI error " | |
618 | "(event=0x%x stat=0x%x)!\n", evnt, stat); | |
63bd2359 JN |
619 | complete(&hw->master_done); |
620 | return IRQ_HANDLED; | |
621 | } | |
622 | ||
623 | /* | |
624 | * while there is something to read from rx fifo | |
625 | * or there is a space to write to tx fifo: | |
626 | */ | |
627 | do { | |
628 | busy = 0; | |
629 | stat = hw->regs->psc_spistat; | |
630 | au_sync(); | |
631 | ||
bbe48ecc JN |
632 | /* |
633 | * Take care to not let the Rx FIFO overflow. | |
634 | * | |
635 | * We only write a byte if we have read one at least. Initially, | |
636 | * the write fifo is full, so we should read from the read fifo | |
637 | * first. | |
638 | * In case we miss a word from the read fifo, we should get a | |
639 | * RO event and should back out. | |
640 | */ | |
641 | if (!(stat & PSC_SPISTAT_RE) && hw->rx_count < hw->len) { | |
63bd2359 | 642 | hw->rx_word(hw); |
63bd2359 | 643 | busy = 1; |
63bd2359 | 644 | |
bbe48ecc JN |
645 | if (!(stat & PSC_SPISTAT_TF) && hw->tx_count < hw->len) |
646 | hw->tx_word(hw); | |
63bd2359 JN |
647 | } |
648 | } while (busy); | |
649 | ||
bbe48ecc | 650 | hw->regs->psc_spievent = PSC_SPIEVNT_RR | PSC_SPIEVNT_TR; |
63bd2359 JN |
651 | au_sync(); |
652 | ||
bbe48ecc JN |
653 | /* |
654 | * Restart the SPI transmission in case of a transmit underflow. | |
655 | * This seems to work despite the notes in the Au1550 data book | |
656 | * of Figure 8-4 with flowchart for SPI master operation: | |
657 | * | |
658 | * """Note 1: An XFR Error Interrupt occurs, unless masked, | |
659 | * for any of the following events: Tx FIFO Underflow, | |
660 | * Rx FIFO Overflow, or Multiple-master Error | |
661 | * Note 2: In case of a Tx Underflow Error, all zeroes are | |
662 | * transmitted.""" | |
663 | * | |
664 | * By simply restarting the spi transfer on Tx Underflow Error, | |
665 | * we assume that spi transfer was paused instead of zeroes | |
666 | * transmittion mentioned in the Note 2 of Au1550 data book. | |
667 | */ | |
668 | if (evnt & PSC_SPIEVNT_TU) { | |
669 | hw->regs->psc_spievent = PSC_SPIEVNT_TU | PSC_SPIEVNT_MD; | |
670 | au_sync(); | |
671 | hw->regs->psc_spipcr = PSC_SPIPCR_MS; | |
672 | au_sync(); | |
673 | } | |
674 | ||
675 | if (hw->rx_count >= hw->len) { | |
63bd2359 JN |
676 | /* transfer completed successfully */ |
677 | au1550_spi_mask_ack_all(hw); | |
678 | complete(&hw->master_done); | |
679 | } | |
680 | return IRQ_HANDLED; | |
681 | } | |
682 | ||
683 | static int au1550_spi_txrx_bufs(struct spi_device *spi, struct spi_transfer *t) | |
684 | { | |
685 | struct au1550_spi *hw = spi_master_get_devdata(spi->master); | |
686 | return hw->txrx_bufs(spi, t); | |
687 | } | |
688 | ||
40369e1c | 689 | static irqreturn_t au1550_spi_irq(int irq, void *dev) |
63bd2359 JN |
690 | { |
691 | struct au1550_spi *hw = dev; | |
692 | return hw->irq_callback(hw); | |
693 | } | |
694 | ||
695 | static void au1550_spi_bits_handlers_set(struct au1550_spi *hw, int bpw) | |
696 | { | |
697 | if (bpw <= 8) { | |
698 | if (hw->usedma) { | |
699 | hw->txrx_bufs = &au1550_spi_dma_txrxb; | |
700 | hw->irq_callback = &au1550_spi_dma_irq_callback; | |
701 | } else { | |
702 | hw->rx_word = &au1550_spi_rx_word_8; | |
703 | hw->tx_word = &au1550_spi_tx_word_8; | |
704 | hw->txrx_bufs = &au1550_spi_pio_txrxb; | |
705 | hw->irq_callback = &au1550_spi_pio_irq_callback; | |
706 | } | |
707 | } else if (bpw <= 16) { | |
708 | hw->rx_word = &au1550_spi_rx_word_16; | |
709 | hw->tx_word = &au1550_spi_tx_word_16; | |
710 | hw->txrx_bufs = &au1550_spi_pio_txrxb; | |
711 | hw->irq_callback = &au1550_spi_pio_irq_callback; | |
712 | } else { | |
713 | hw->rx_word = &au1550_spi_rx_word_32; | |
714 | hw->tx_word = &au1550_spi_tx_word_32; | |
715 | hw->txrx_bufs = &au1550_spi_pio_txrxb; | |
716 | hw->irq_callback = &au1550_spi_pio_irq_callback; | |
717 | } | |
718 | } | |
719 | ||
2deff8d6 | 720 | static void au1550_spi_setup_psc_as_spi(struct au1550_spi *hw) |
63bd2359 JN |
721 | { |
722 | u32 stat, cfg; | |
723 | ||
724 | /* set up the PSC for SPI mode */ | |
725 | hw->regs->psc_ctrl = PSC_CTRL_DISABLE; | |
726 | au_sync(); | |
727 | hw->regs->psc_sel = PSC_SEL_PS_SPIMODE; | |
728 | au_sync(); | |
729 | ||
730 | hw->regs->psc_spicfg = 0; | |
731 | au_sync(); | |
732 | ||
733 | hw->regs->psc_ctrl = PSC_CTRL_ENABLE; | |
734 | au_sync(); | |
735 | ||
736 | do { | |
737 | stat = hw->regs->psc_spistat; | |
738 | au_sync(); | |
739 | } while ((stat & PSC_SPISTAT_SR) == 0); | |
740 | ||
741 | ||
742 | cfg = hw->usedma ? 0 : PSC_SPICFG_DD_DISABLE; | |
743 | cfg |= PSC_SPICFG_SET_LEN(8); | |
744 | cfg |= PSC_SPICFG_RT_FIFO8 | PSC_SPICFG_TT_FIFO8; | |
745 | /* use minimal allowed brg and div values as initial setting: */ | |
746 | cfg |= PSC_SPICFG_SET_BAUD(4) | PSC_SPICFG_SET_DIV(0); | |
747 | ||
748 | #ifdef AU1550_SPI_DEBUG_LOOPBACK | |
749 | cfg |= PSC_SPICFG_LB; | |
750 | #endif | |
751 | ||
752 | hw->regs->psc_spicfg = cfg; | |
753 | au_sync(); | |
754 | ||
755 | au1550_spi_mask_ack_all(hw); | |
756 | ||
757 | hw->regs->psc_spicfg |= PSC_SPICFG_DE_ENABLE; | |
758 | au_sync(); | |
759 | ||
760 | do { | |
761 | stat = hw->regs->psc_spistat; | |
762 | au_sync(); | |
763 | } while ((stat & PSC_SPISTAT_DR) == 0); | |
bbe48ecc JN |
764 | |
765 | au1550_spi_reset_fifos(hw); | |
63bd2359 JN |
766 | } |
767 | ||
768 | ||
2deff8d6 | 769 | static int au1550_spi_probe(struct platform_device *pdev) |
63bd2359 JN |
770 | { |
771 | struct au1550_spi *hw; | |
772 | struct spi_master *master; | |
3a93a159 | 773 | struct resource *r; |
63bd2359 JN |
774 | int err = 0; |
775 | ||
776 | master = spi_alloc_master(&pdev->dev, sizeof(struct au1550_spi)); | |
777 | if (master == NULL) { | |
778 | dev_err(&pdev->dev, "No memory for spi_master\n"); | |
779 | err = -ENOMEM; | |
780 | goto err_nomem; | |
781 | } | |
782 | ||
e7db06b5 DB |
783 | /* the spi->mode bits understood by this driver: */ |
784 | master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST; | |
785 | ||
63bd2359 JN |
786 | hw = spi_master_get_devdata(master); |
787 | ||
788 | hw->master = spi_master_get(master); | |
789 | hw->pdata = pdev->dev.platform_data; | |
790 | hw->dev = &pdev->dev; | |
791 | ||
792 | if (hw->pdata == NULL) { | |
793 | dev_err(&pdev->dev, "No platform data supplied\n"); | |
794 | err = -ENOENT; | |
795 | goto err_no_pdata; | |
796 | } | |
797 | ||
3a93a159 ML |
798 | r = platform_get_resource(pdev, IORESOURCE_IRQ, 0); |
799 | if (!r) { | |
800 | dev_err(&pdev->dev, "no IRQ\n"); | |
801 | err = -ENODEV; | |
802 | goto err_no_iores; | |
803 | } | |
804 | hw->irq = r->start; | |
805 | ||
806 | hw->usedma = 0; | |
807 | r = platform_get_resource(pdev, IORESOURCE_DMA, 0); | |
808 | if (r) { | |
809 | hw->dma_tx_id = r->start; | |
810 | r = platform_get_resource(pdev, IORESOURCE_DMA, 1); | |
811 | if (r) { | |
812 | hw->dma_rx_id = r->start; | |
813 | if (usedma && ddma_memid) { | |
814 | if (pdev->dev.dma_mask == NULL) | |
815 | dev_warn(&pdev->dev, "no dma mask\n"); | |
816 | else | |
817 | hw->usedma = 1; | |
818 | } | |
819 | } | |
820 | } | |
63bd2359 | 821 | |
3a93a159 ML |
822 | r = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
823 | if (!r) { | |
824 | dev_err(&pdev->dev, "no mmio resource\n"); | |
825 | err = -ENODEV; | |
826 | goto err_no_iores; | |
63bd2359 JN |
827 | } |
828 | ||
3a93a159 ML |
829 | hw->ioarea = request_mem_region(r->start, sizeof(psc_spi_t), |
830 | pdev->name); | |
831 | if (!hw->ioarea) { | |
63bd2359 JN |
832 | dev_err(&pdev->dev, "Cannot reserve iomem region\n"); |
833 | err = -ENXIO; | |
834 | goto err_no_iores; | |
835 | } | |
836 | ||
3a93a159 ML |
837 | hw->regs = (psc_spi_t __iomem *)ioremap(r->start, sizeof(psc_spi_t)); |
838 | if (!hw->regs) { | |
839 | dev_err(&pdev->dev, "cannot ioremap\n"); | |
840 | err = -ENXIO; | |
841 | goto err_ioremap; | |
63bd2359 JN |
842 | } |
843 | ||
3a93a159 | 844 | platform_set_drvdata(pdev, hw); |
63bd2359 | 845 | |
3a93a159 ML |
846 | init_completion(&hw->master_done); |
847 | ||
848 | hw->bitbang.master = hw->master; | |
849 | hw->bitbang.setup_transfer = au1550_spi_setupxfer; | |
850 | hw->bitbang.chipselect = au1550_spi_chipsel; | |
851 | hw->bitbang.master->setup = au1550_spi_setup; | |
852 | hw->bitbang.txrx_bufs = au1550_spi_txrx_bufs; | |
853 | ||
854 | if (hw->usedma) { | |
855 | hw->dma_tx_ch = au1xxx_dbdma_chan_alloc(ddma_memid, | |
63bd2359 JN |
856 | hw->dma_tx_id, NULL, (void *)hw); |
857 | if (hw->dma_tx_ch == 0) { | |
858 | dev_err(&pdev->dev, | |
859 | "Cannot allocate tx dma channel\n"); | |
860 | err = -ENXIO; | |
861 | goto err_no_txdma; | |
862 | } | |
863 | au1xxx_dbdma_set_devwidth(hw->dma_tx_ch, 8); | |
864 | if (au1xxx_dbdma_ring_alloc(hw->dma_tx_ch, | |
865 | AU1550_SPI_DBDMA_DESCRIPTORS) == 0) { | |
866 | dev_err(&pdev->dev, | |
867 | "Cannot allocate tx dma descriptors\n"); | |
868 | err = -ENXIO; | |
869 | goto err_no_txdma_descr; | |
870 | } | |
871 | ||
872 | ||
873 | hw->dma_rx_ch = au1xxx_dbdma_chan_alloc(hw->dma_rx_id, | |
3a93a159 | 874 | ddma_memid, NULL, (void *)hw); |
63bd2359 JN |
875 | if (hw->dma_rx_ch == 0) { |
876 | dev_err(&pdev->dev, | |
877 | "Cannot allocate rx dma channel\n"); | |
878 | err = -ENXIO; | |
879 | goto err_no_rxdma; | |
880 | } | |
881 | au1xxx_dbdma_set_devwidth(hw->dma_rx_ch, 8); | |
882 | if (au1xxx_dbdma_ring_alloc(hw->dma_rx_ch, | |
883 | AU1550_SPI_DBDMA_DESCRIPTORS) == 0) { | |
884 | dev_err(&pdev->dev, | |
885 | "Cannot allocate rx dma descriptors\n"); | |
886 | err = -ENXIO; | |
887 | goto err_no_rxdma_descr; | |
888 | } | |
889 | ||
890 | err = au1550_spi_dma_rxtmp_alloc(hw, | |
891 | AU1550_SPI_DMA_RXTMP_MINSIZE); | |
892 | if (err < 0) { | |
893 | dev_err(&pdev->dev, | |
894 | "Cannot allocate initial rx dma tmp buffer\n"); | |
895 | goto err_dma_rxtmp_alloc; | |
896 | } | |
897 | } | |
898 | ||
899 | au1550_spi_bits_handlers_set(hw, 8); | |
900 | ||
901 | err = request_irq(hw->irq, au1550_spi_irq, 0, pdev->name, hw); | |
902 | if (err) { | |
903 | dev_err(&pdev->dev, "Cannot claim IRQ\n"); | |
904 | goto err_no_irq; | |
905 | } | |
906 | ||
3a93a159 | 907 | master->bus_num = pdev->id; |
63bd2359 JN |
908 | master->num_chipselect = hw->pdata->num_chipselect; |
909 | ||
910 | /* | |
911 | * precompute valid range for spi freq - from au1550 datasheet: | |
912 | * psc_tempclk = psc_mainclk / (2 << DIV) | |
913 | * spiclk = psc_tempclk / (2 * (BRG + 1)) | |
914 | * BRG valid range is 4..63 | |
915 | * DIV valid range is 0..3 | |
916 | * round the min and max frequencies to values that would still | |
917 | * produce valid brg and div | |
918 | */ | |
919 | { | |
920 | int min_div = (2 << 0) * (2 * (4 + 1)); | |
921 | int max_div = (2 << 3) * (2 * (63 + 1)); | |
922 | hw->freq_max = hw->pdata->mainclk_hz / min_div; | |
923 | hw->freq_min = hw->pdata->mainclk_hz / (max_div + 1) + 1; | |
924 | } | |
925 | ||
926 | au1550_spi_setup_psc_as_spi(hw); | |
927 | ||
928 | err = spi_bitbang_start(&hw->bitbang); | |
929 | if (err) { | |
930 | dev_err(&pdev->dev, "Failed to register SPI master\n"); | |
931 | goto err_register; | |
932 | } | |
933 | ||
934 | dev_info(&pdev->dev, | |
935 | "spi master registered: bus_num=%d num_chipselect=%d\n", | |
936 | master->bus_num, master->num_chipselect); | |
937 | ||
938 | return 0; | |
939 | ||
940 | err_register: | |
941 | free_irq(hw->irq, hw); | |
942 | ||
943 | err_no_irq: | |
944 | au1550_spi_dma_rxtmp_free(hw); | |
945 | ||
946 | err_dma_rxtmp_alloc: | |
947 | err_no_rxdma_descr: | |
948 | if (hw->usedma) | |
949 | au1xxx_dbdma_chan_free(hw->dma_rx_ch); | |
950 | ||
951 | err_no_rxdma: | |
952 | err_no_txdma_descr: | |
953 | if (hw->usedma) | |
954 | au1xxx_dbdma_chan_free(hw->dma_tx_ch); | |
955 | ||
956 | err_no_txdma: | |
3a93a159 ML |
957 | iounmap((void __iomem *)hw->regs); |
958 | ||
959 | err_ioremap: | |
960 | release_resource(hw->ioarea); | |
961 | kfree(hw->ioarea); | |
63bd2359 JN |
962 | |
963 | err_no_iores: | |
964 | err_no_pdata: | |
965 | spi_master_put(hw->master); | |
966 | ||
967 | err_nomem: | |
968 | return err; | |
969 | } | |
970 | ||
2deff8d6 | 971 | static int au1550_spi_remove(struct platform_device *pdev) |
63bd2359 JN |
972 | { |
973 | struct au1550_spi *hw = platform_get_drvdata(pdev); | |
974 | ||
975 | dev_info(&pdev->dev, "spi master remove: bus_num=%d\n", | |
976 | hw->master->bus_num); | |
977 | ||
978 | spi_bitbang_stop(&hw->bitbang); | |
979 | free_irq(hw->irq, hw); | |
3a93a159 ML |
980 | iounmap((void __iomem *)hw->regs); |
981 | release_resource(hw->ioarea); | |
982 | kfree(hw->ioarea); | |
63bd2359 JN |
983 | |
984 | if (hw->usedma) { | |
985 | au1550_spi_dma_rxtmp_free(hw); | |
986 | au1xxx_dbdma_chan_free(hw->dma_rx_ch); | |
987 | au1xxx_dbdma_chan_free(hw->dma_tx_ch); | |
988 | } | |
989 | ||
990 | platform_set_drvdata(pdev, NULL); | |
991 | ||
992 | spi_master_put(hw->master); | |
993 | return 0; | |
994 | } | |
995 | ||
7e38c3c4 KS |
996 | /* work with hotplug and coldplug */ |
997 | MODULE_ALIAS("platform:au1550-spi"); | |
998 | ||
63bd2359 | 999 | static struct platform_driver au1550_spi_drv = { |
2deff8d6 | 1000 | .remove = au1550_spi_remove, |
63bd2359 JN |
1001 | .driver = { |
1002 | .name = "au1550-spi", | |
1003 | .owner = THIS_MODULE, | |
1004 | }, | |
1005 | }; | |
1006 | ||
1007 | static int __init au1550_spi_init(void) | |
1008 | { | |
3a93a159 ML |
1009 | /* |
1010 | * create memory device with 8 bits dev_devwidth | |
1011 | * needed for proper byte ordering to spi fifo | |
1012 | */ | |
1013 | if (usedma) { | |
1014 | ddma_memid = au1xxx_ddma_add_device(&au1550_spi_mem_dbdev); | |
1015 | if (!ddma_memid) | |
1016 | printk(KERN_ERR "au1550-spi: cannot add memory" | |
1017 | "dbdma device\n"); | |
1018 | } | |
63bd2359 JN |
1019 | return platform_driver_probe(&au1550_spi_drv, au1550_spi_probe); |
1020 | } | |
1021 | module_init(au1550_spi_init); | |
1022 | ||
1023 | static void __exit au1550_spi_exit(void) | |
1024 | { | |
3a93a159 ML |
1025 | if (usedma && ddma_memid) |
1026 | au1xxx_ddma_del_device(ddma_memid); | |
63bd2359 JN |
1027 | platform_driver_unregister(&au1550_spi_drv); |
1028 | } | |
1029 | module_exit(au1550_spi_exit); | |
1030 | ||
1031 | MODULE_DESCRIPTION("Au1550 PSC SPI Driver"); | |
1032 | MODULE_AUTHOR("Jan Nikitenko <jan.nikitenko@gmail.com>"); | |
1033 | MODULE_LICENSE("GPL"); |