Commit | Line | Data |
---|---|---|
a5f6abd4 | 1 | /* |
131b17d4 BW |
2 | * File: drivers/spi/bfin5xx_spi.c |
3 | * Maintainer: | |
4 | * Bryan Wu <bryan.wu@analog.com> | |
5 | * Original Author: | |
6 | * Luke Yang (Analog Devices Inc.) | |
a5f6abd4 | 7 | * |
131b17d4 BW |
8 | * Created: March. 10th 2006 |
9 | * Description: SPI controller driver for Blackfin BF5xx | |
10 | * Bugs: Enter bugs at http://blackfin.uclinux.org/ | |
a5f6abd4 WB |
11 | * |
12 | * Modified: | |
13 | * March 10, 2006 bfin5xx_spi.c Created. (Luke Yang) | |
14 | * August 7, 2006 added full duplex mode (Axel Weiss & Luke Yang) | |
131b17d4 | 15 | * July 17, 2007 add support for BF54x SPI0 controller (Bryan Wu) |
a32c691d BW |
16 | * July 30, 2007 add platfrom_resource interface to support multi-port |
17 | * SPI controller (Bryan Wu) | |
a5f6abd4 | 18 | * |
131b17d4 | 19 | * Copyright 2004-2007 Analog Devices Inc. |
a5f6abd4 WB |
20 | * |
21 | * This program is free software ; you can redistribute it and/or modify | |
22 | * it under the terms of the GNU General Public License as published by | |
23 | * the Free Software Foundation ; either version 2, or (at your option) | |
24 | * any later version. | |
25 | * | |
26 | * This program is distributed in the hope that it will be useful, | |
27 | * but WITHOUT ANY WARRANTY ; without even the implied warranty of | |
28 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
29 | * GNU General Public License for more details. | |
30 | * | |
31 | * You should have received a copy of the GNU General Public License | |
32 | * along with this program ; see the file COPYING. | |
33 | * If not, write to the Free Software Foundation, | |
34 | * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
35 | */ | |
36 | ||
37 | #include <linux/init.h> | |
38 | #include <linux/module.h> | |
131b17d4 | 39 | #include <linux/delay.h> |
a5f6abd4 | 40 | #include <linux/device.h> |
131b17d4 | 41 | #include <linux/io.h> |
a5f6abd4 | 42 | #include <linux/ioport.h> |
131b17d4 | 43 | #include <linux/irq.h> |
a5f6abd4 WB |
44 | #include <linux/errno.h> |
45 | #include <linux/interrupt.h> | |
46 | #include <linux/platform_device.h> | |
47 | #include <linux/dma-mapping.h> | |
48 | #include <linux/spi/spi.h> | |
49 | #include <linux/workqueue.h> | |
a5f6abd4 | 50 | |
a5f6abd4 | 51 | #include <asm/dma.h> |
131b17d4 | 52 | #include <asm/portmux.h> |
a5f6abd4 WB |
53 | #include <asm/bfin5xx_spi.h> |
54 | ||
a32c691d BW |
55 | #define DRV_NAME "bfin-spi" |
56 | #define DRV_AUTHOR "Bryan Wu, Luke Yang" | |
6b1a8028 | 57 | #define DRV_DESC "Blackfin BF5xx on-chip SPI Controller Driver" |
a32c691d BW |
58 | #define DRV_VERSION "1.0" |
59 | ||
60 | MODULE_AUTHOR(DRV_AUTHOR); | |
61 | MODULE_DESCRIPTION(DRV_DESC); | |
a5f6abd4 WB |
62 | MODULE_LICENSE("GPL"); |
63 | ||
bb90eb00 | 64 | #define IS_DMA_ALIGNED(x) (((u32)(x)&0x07) == 0) |
a5f6abd4 | 65 | |
bb90eb00 BW |
66 | #define START_STATE ((void *)0) |
67 | #define RUNNING_STATE ((void *)1) | |
68 | #define DONE_STATE ((void *)2) | |
69 | #define ERROR_STATE ((void *)-1) | |
70 | #define QUEUE_RUNNING 0 | |
71 | #define QUEUE_STOPPED 1 | |
a5f6abd4 WB |
72 | |
73 | struct driver_data { | |
74 | /* Driver model hookup */ | |
75 | struct platform_device *pdev; | |
76 | ||
77 | /* SPI framework hookup */ | |
78 | struct spi_master *master; | |
79 | ||
bb90eb00 | 80 | /* Regs base of SPI controller */ |
f452126c | 81 | void __iomem *regs_base; |
bb90eb00 | 82 | |
003d9226 BW |
83 | /* Pin request list */ |
84 | u16 *pin_req; | |
85 | ||
a5f6abd4 WB |
86 | /* BFIN hookup */ |
87 | struct bfin5xx_spi_master *master_info; | |
88 | ||
89 | /* Driver message queue */ | |
90 | struct workqueue_struct *workqueue; | |
91 | struct work_struct pump_messages; | |
92 | spinlock_t lock; | |
93 | struct list_head queue; | |
94 | int busy; | |
95 | int run; | |
96 | ||
97 | /* Message Transfer pump */ | |
98 | struct tasklet_struct pump_transfers; | |
99 | ||
100 | /* Current message transfer state info */ | |
101 | struct spi_message *cur_msg; | |
102 | struct spi_transfer *cur_transfer; | |
103 | struct chip_data *cur_chip; | |
104 | size_t len_in_bytes; | |
105 | size_t len; | |
106 | void *tx; | |
107 | void *tx_end; | |
108 | void *rx; | |
109 | void *rx_end; | |
bb90eb00 BW |
110 | |
111 | /* DMA stuffs */ | |
112 | int dma_channel; | |
a5f6abd4 | 113 | int dma_mapped; |
bb90eb00 | 114 | int dma_requested; |
a5f6abd4 WB |
115 | dma_addr_t rx_dma; |
116 | dma_addr_t tx_dma; | |
bb90eb00 | 117 | |
a5f6abd4 WB |
118 | size_t rx_map_len; |
119 | size_t tx_map_len; | |
120 | u8 n_bytes; | |
fad91c89 | 121 | int cs_change; |
a5f6abd4 WB |
122 | void (*write) (struct driver_data *); |
123 | void (*read) (struct driver_data *); | |
124 | void (*duplex) (struct driver_data *); | |
125 | }; | |
126 | ||
127 | struct chip_data { | |
128 | u16 ctl_reg; | |
129 | u16 baud; | |
130 | u16 flag; | |
131 | ||
132 | u8 chip_select_num; | |
133 | u8 n_bytes; | |
88b40369 | 134 | u8 width; /* 0 or 1 */ |
a5f6abd4 WB |
135 | u8 enable_dma; |
136 | u8 bits_per_word; /* 8 or 16 */ | |
137 | u8 cs_change_per_word; | |
62310e51 | 138 | u16 cs_chg_udelay; /* Some devices require > 255usec delay */ |
a5f6abd4 WB |
139 | void (*write) (struct driver_data *); |
140 | void (*read) (struct driver_data *); | |
141 | void (*duplex) (struct driver_data *); | |
142 | }; | |
143 | ||
bb90eb00 BW |
144 | #define DEFINE_SPI_REG(reg, off) \ |
145 | static inline u16 read_##reg(struct driver_data *drv_data) \ | |
146 | { return bfin_read16(drv_data->regs_base + off); } \ | |
147 | static inline void write_##reg(struct driver_data *drv_data, u16 v) \ | |
148 | { bfin_write16(drv_data->regs_base + off, v); } | |
149 | ||
150 | DEFINE_SPI_REG(CTRL, 0x00) | |
151 | DEFINE_SPI_REG(FLAG, 0x04) | |
152 | DEFINE_SPI_REG(STAT, 0x08) | |
153 | DEFINE_SPI_REG(TDBR, 0x0C) | |
154 | DEFINE_SPI_REG(RDBR, 0x10) | |
155 | DEFINE_SPI_REG(BAUD, 0x14) | |
156 | DEFINE_SPI_REG(SHAW, 0x18) | |
157 | ||
88b40369 | 158 | static void bfin_spi_enable(struct driver_data *drv_data) |
a5f6abd4 WB |
159 | { |
160 | u16 cr; | |
161 | ||
bb90eb00 BW |
162 | cr = read_CTRL(drv_data); |
163 | write_CTRL(drv_data, (cr | BIT_CTL_ENABLE)); | |
a5f6abd4 WB |
164 | } |
165 | ||
88b40369 | 166 | static void bfin_spi_disable(struct driver_data *drv_data) |
a5f6abd4 WB |
167 | { |
168 | u16 cr; | |
169 | ||
bb90eb00 BW |
170 | cr = read_CTRL(drv_data); |
171 | write_CTRL(drv_data, (cr & (~BIT_CTL_ENABLE))); | |
a5f6abd4 WB |
172 | } |
173 | ||
174 | /* Caculate the SPI_BAUD register value based on input HZ */ | |
175 | static u16 hz_to_spi_baud(u32 speed_hz) | |
176 | { | |
177 | u_long sclk = get_sclk(); | |
178 | u16 spi_baud = (sclk / (2 * speed_hz)); | |
179 | ||
180 | if ((sclk % (2 * speed_hz)) > 0) | |
181 | spi_baud++; | |
182 | ||
a5f6abd4 WB |
183 | return spi_baud; |
184 | } | |
185 | ||
186 | static int flush(struct driver_data *drv_data) | |
187 | { | |
188 | unsigned long limit = loops_per_jiffy << 1; | |
189 | ||
190 | /* wait for stop and clear stat */ | |
bb90eb00 | 191 | while (!(read_STAT(drv_data) & BIT_STAT_SPIF) && limit--) |
d8c05008 | 192 | cpu_relax(); |
a5f6abd4 | 193 | |
bb90eb00 | 194 | write_STAT(drv_data, BIT_STAT_CLR); |
a5f6abd4 WB |
195 | |
196 | return limit; | |
197 | } | |
198 | ||
fad91c89 | 199 | /* Chip select operation functions for cs_change flag */ |
bb90eb00 | 200 | static void cs_active(struct driver_data *drv_data, struct chip_data *chip) |
fad91c89 | 201 | { |
bb90eb00 | 202 | u16 flag = read_FLAG(drv_data); |
fad91c89 BW |
203 | |
204 | flag |= chip->flag; | |
205 | flag &= ~(chip->flag << 8); | |
206 | ||
bb90eb00 | 207 | write_FLAG(drv_data, flag); |
fad91c89 BW |
208 | } |
209 | ||
bb90eb00 | 210 | static void cs_deactive(struct driver_data *drv_data, struct chip_data *chip) |
fad91c89 | 211 | { |
bb90eb00 | 212 | u16 flag = read_FLAG(drv_data); |
fad91c89 BW |
213 | |
214 | flag |= (chip->flag << 8); | |
215 | ||
bb90eb00 | 216 | write_FLAG(drv_data, flag); |
62310e51 BW |
217 | |
218 | /* Move delay here for consistency */ | |
219 | if (chip->cs_chg_udelay) | |
220 | udelay(chip->cs_chg_udelay); | |
fad91c89 BW |
221 | } |
222 | ||
7c4ef094 | 223 | #define MAX_SPI_SSEL 7 |
5fec5b5a | 224 | |
a5f6abd4 | 225 | /* stop controller and re-config current chip*/ |
8d20d0a7 | 226 | static void restore_state(struct driver_data *drv_data) |
a5f6abd4 WB |
227 | { |
228 | struct chip_data *chip = drv_data->cur_chip; | |
12e17c42 | 229 | |
a5f6abd4 | 230 | /* Clear status and disable clock */ |
bb90eb00 | 231 | write_STAT(drv_data, BIT_STAT_CLR); |
a5f6abd4 | 232 | bfin_spi_disable(drv_data); |
88b40369 | 233 | dev_dbg(&drv_data->pdev->dev, "restoring spi ctl state\n"); |
a5f6abd4 | 234 | |
5fec5b5a | 235 | /* Load the registers */ |
bb90eb00 | 236 | write_CTRL(drv_data, chip->ctl_reg); |
092e1fda | 237 | write_BAUD(drv_data, chip->baud); |
cc487e73 SZ |
238 | |
239 | bfin_spi_enable(drv_data); | |
07612e5f | 240 | cs_active(drv_data, chip); |
a5f6abd4 WB |
241 | } |
242 | ||
243 | /* used to kick off transfer in rx mode */ | |
bb90eb00 | 244 | static unsigned short dummy_read(struct driver_data *drv_data) |
a5f6abd4 WB |
245 | { |
246 | unsigned short tmp; | |
bb90eb00 | 247 | tmp = read_RDBR(drv_data); |
a5f6abd4 WB |
248 | return tmp; |
249 | } | |
250 | ||
251 | static void null_writer(struct driver_data *drv_data) | |
252 | { | |
253 | u8 n_bytes = drv_data->n_bytes; | |
254 | ||
255 | while (drv_data->tx < drv_data->tx_end) { | |
bb90eb00 BW |
256 | write_TDBR(drv_data, 0); |
257 | while ((read_STAT(drv_data) & BIT_STAT_TXS)) | |
d8c05008 | 258 | cpu_relax(); |
a5f6abd4 WB |
259 | drv_data->tx += n_bytes; |
260 | } | |
261 | } | |
262 | ||
263 | static void null_reader(struct driver_data *drv_data) | |
264 | { | |
265 | u8 n_bytes = drv_data->n_bytes; | |
bb90eb00 | 266 | dummy_read(drv_data); |
a5f6abd4 WB |
267 | |
268 | while (drv_data->rx < drv_data->rx_end) { | |
bb90eb00 | 269 | while (!(read_STAT(drv_data) & BIT_STAT_RXS)) |
d8c05008 | 270 | cpu_relax(); |
bb90eb00 | 271 | dummy_read(drv_data); |
a5f6abd4 WB |
272 | drv_data->rx += n_bytes; |
273 | } | |
274 | } | |
275 | ||
276 | static void u8_writer(struct driver_data *drv_data) | |
277 | { | |
131b17d4 | 278 | dev_dbg(&drv_data->pdev->dev, |
bb90eb00 | 279 | "cr8-s is 0x%x\n", read_STAT(drv_data)); |
cc487e73 | 280 | |
3f479a65 | 281 | /* poll for SPI completion before start */ |
bb90eb00 | 282 | while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) |
d8c05008 | 283 | cpu_relax(); |
3f479a65 | 284 | |
a5f6abd4 | 285 | while (drv_data->tx < drv_data->tx_end) { |
bb90eb00 BW |
286 | write_TDBR(drv_data, (*(u8 *) (drv_data->tx))); |
287 | while (read_STAT(drv_data) & BIT_STAT_TXS) | |
d8c05008 | 288 | cpu_relax(); |
a5f6abd4 WB |
289 | ++drv_data->tx; |
290 | } | |
a5f6abd4 WB |
291 | } |
292 | ||
293 | static void u8_cs_chg_writer(struct driver_data *drv_data) | |
294 | { | |
295 | struct chip_data *chip = drv_data->cur_chip; | |
296 | ||
3f479a65 | 297 | /* poll for SPI completion before start */ |
bb90eb00 | 298 | while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) |
d8c05008 | 299 | cpu_relax(); |
3f479a65 | 300 | |
a5f6abd4 | 301 | while (drv_data->tx < drv_data->tx_end) { |
bb90eb00 | 302 | cs_active(drv_data, chip); |
a5f6abd4 | 303 | |
bb90eb00 BW |
304 | write_TDBR(drv_data, (*(u8 *) (drv_data->tx))); |
305 | while (read_STAT(drv_data) & BIT_STAT_TXS) | |
d8c05008 | 306 | cpu_relax(); |
62310e51 | 307 | |
bb90eb00 | 308 | cs_deactive(drv_data, chip); |
5fec5b5a | 309 | |
a5f6abd4 WB |
310 | ++drv_data->tx; |
311 | } | |
a5f6abd4 WB |
312 | } |
313 | ||
314 | static void u8_reader(struct driver_data *drv_data) | |
315 | { | |
131b17d4 | 316 | dev_dbg(&drv_data->pdev->dev, |
bb90eb00 | 317 | "cr-8 is 0x%x\n", read_STAT(drv_data)); |
a5f6abd4 | 318 | |
3f479a65 | 319 | /* poll for SPI completion before start */ |
bb90eb00 | 320 | while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) |
d8c05008 | 321 | cpu_relax(); |
3f479a65 | 322 | |
a5f6abd4 | 323 | /* clear TDBR buffer before read(else it will be shifted out) */ |
bb90eb00 | 324 | write_TDBR(drv_data, 0xFFFF); |
a5f6abd4 | 325 | |
bb90eb00 | 326 | dummy_read(drv_data); |
cc487e73 | 327 | |
a5f6abd4 | 328 | while (drv_data->rx < drv_data->rx_end - 1) { |
bb90eb00 | 329 | while (!(read_STAT(drv_data) & BIT_STAT_RXS)) |
d8c05008 | 330 | cpu_relax(); |
bb90eb00 | 331 | *(u8 *) (drv_data->rx) = read_RDBR(drv_data); |
a5f6abd4 WB |
332 | ++drv_data->rx; |
333 | } | |
334 | ||
bb90eb00 | 335 | while (!(read_STAT(drv_data) & BIT_STAT_RXS)) |
d8c05008 | 336 | cpu_relax(); |
bb90eb00 | 337 | *(u8 *) (drv_data->rx) = read_SHAW(drv_data); |
a5f6abd4 WB |
338 | ++drv_data->rx; |
339 | } | |
340 | ||
341 | static void u8_cs_chg_reader(struct driver_data *drv_data) | |
342 | { | |
343 | struct chip_data *chip = drv_data->cur_chip; | |
344 | ||
3f479a65 | 345 | /* poll for SPI completion before start */ |
bb90eb00 | 346 | while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) |
d8c05008 | 347 | cpu_relax(); |
3f479a65 | 348 | |
cc487e73 | 349 | /* clear TDBR buffer before read(else it will be shifted out) */ |
bb90eb00 | 350 | write_TDBR(drv_data, 0xFFFF); |
a5f6abd4 | 351 | |
bb90eb00 BW |
352 | cs_active(drv_data, chip); |
353 | dummy_read(drv_data); | |
cc487e73 SZ |
354 | |
355 | while (drv_data->rx < drv_data->rx_end - 1) { | |
bb90eb00 | 356 | cs_deactive(drv_data, chip); |
5fec5b5a | 357 | |
bb90eb00 | 358 | while (!(read_STAT(drv_data) & BIT_STAT_RXS)) |
d8c05008 | 359 | cpu_relax(); |
bb90eb00 BW |
360 | cs_active(drv_data, chip); |
361 | *(u8 *) (drv_data->rx) = read_RDBR(drv_data); | |
a5f6abd4 WB |
362 | ++drv_data->rx; |
363 | } | |
bb90eb00 | 364 | cs_deactive(drv_data, chip); |
5fec5b5a | 365 | |
bb90eb00 | 366 | while (!(read_STAT(drv_data) & BIT_STAT_RXS)) |
d8c05008 | 367 | cpu_relax(); |
bb90eb00 | 368 | *(u8 *) (drv_data->rx) = read_SHAW(drv_data); |
cc487e73 | 369 | ++drv_data->rx; |
a5f6abd4 WB |
370 | } |
371 | ||
372 | static void u8_duplex(struct driver_data *drv_data) | |
373 | { | |
3f479a65 | 374 | /* poll for SPI completion before start */ |
bb90eb00 | 375 | while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) |
d8c05008 | 376 | cpu_relax(); |
3f479a65 | 377 | |
a5f6abd4 WB |
378 | /* in duplex mode, clk is triggered by writing of TDBR */ |
379 | while (drv_data->rx < drv_data->rx_end) { | |
bb90eb00 BW |
380 | write_TDBR(drv_data, (*(u8 *) (drv_data->tx))); |
381 | while (read_STAT(drv_data) & BIT_STAT_TXS) | |
d8c05008 | 382 | cpu_relax(); |
bb90eb00 | 383 | while (!(read_STAT(drv_data) & BIT_STAT_RXS)) |
d8c05008 | 384 | cpu_relax(); |
bb90eb00 | 385 | *(u8 *) (drv_data->rx) = read_RDBR(drv_data); |
a5f6abd4 WB |
386 | ++drv_data->rx; |
387 | ++drv_data->tx; | |
388 | } | |
389 | } | |
390 | ||
391 | static void u8_cs_chg_duplex(struct driver_data *drv_data) | |
392 | { | |
393 | struct chip_data *chip = drv_data->cur_chip; | |
394 | ||
3f479a65 | 395 | /* poll for SPI completion before start */ |
bb90eb00 | 396 | while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) |
d8c05008 | 397 | cpu_relax(); |
3f479a65 | 398 | |
a5f6abd4 | 399 | while (drv_data->rx < drv_data->rx_end) { |
bb90eb00 | 400 | cs_active(drv_data, chip); |
5fec5b5a | 401 | |
bb90eb00 BW |
402 | write_TDBR(drv_data, (*(u8 *) (drv_data->tx))); |
403 | while (read_STAT(drv_data) & BIT_STAT_TXS) | |
d8c05008 | 404 | cpu_relax(); |
bb90eb00 | 405 | while (!(read_STAT(drv_data) & BIT_STAT_RXS)) |
d8c05008 | 406 | cpu_relax(); |
bb90eb00 | 407 | *(u8 *) (drv_data->rx) = read_RDBR(drv_data); |
62310e51 | 408 | |
bb90eb00 | 409 | cs_deactive(drv_data, chip); |
5fec5b5a | 410 | |
a5f6abd4 WB |
411 | ++drv_data->rx; |
412 | ++drv_data->tx; | |
413 | } | |
a5f6abd4 WB |
414 | } |
415 | ||
416 | static void u16_writer(struct driver_data *drv_data) | |
417 | { | |
131b17d4 | 418 | dev_dbg(&drv_data->pdev->dev, |
bb90eb00 | 419 | "cr16 is 0x%x\n", read_STAT(drv_data)); |
88b40369 | 420 | |
3f479a65 | 421 | /* poll for SPI completion before start */ |
bb90eb00 | 422 | while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) |
d8c05008 | 423 | cpu_relax(); |
3f479a65 | 424 | |
a5f6abd4 | 425 | while (drv_data->tx < drv_data->tx_end) { |
bb90eb00 BW |
426 | write_TDBR(drv_data, (*(u16 *) (drv_data->tx))); |
427 | while ((read_STAT(drv_data) & BIT_STAT_TXS)) | |
d8c05008 | 428 | cpu_relax(); |
a5f6abd4 WB |
429 | drv_data->tx += 2; |
430 | } | |
a5f6abd4 WB |
431 | } |
432 | ||
433 | static void u16_cs_chg_writer(struct driver_data *drv_data) | |
434 | { | |
435 | struct chip_data *chip = drv_data->cur_chip; | |
436 | ||
3f479a65 | 437 | /* poll for SPI completion before start */ |
bb90eb00 | 438 | while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) |
d8c05008 | 439 | cpu_relax(); |
3f479a65 | 440 | |
a5f6abd4 | 441 | while (drv_data->tx < drv_data->tx_end) { |
bb90eb00 | 442 | cs_active(drv_data, chip); |
a5f6abd4 | 443 | |
bb90eb00 BW |
444 | write_TDBR(drv_data, (*(u16 *) (drv_data->tx))); |
445 | while ((read_STAT(drv_data) & BIT_STAT_TXS)) | |
d8c05008 | 446 | cpu_relax(); |
62310e51 | 447 | |
bb90eb00 | 448 | cs_deactive(drv_data, chip); |
5fec5b5a | 449 | |
a5f6abd4 WB |
450 | drv_data->tx += 2; |
451 | } | |
a5f6abd4 WB |
452 | } |
453 | ||
454 | static void u16_reader(struct driver_data *drv_data) | |
455 | { | |
88b40369 | 456 | dev_dbg(&drv_data->pdev->dev, |
bb90eb00 | 457 | "cr-16 is 0x%x\n", read_STAT(drv_data)); |
cc487e73 | 458 | |
3f479a65 | 459 | /* poll for SPI completion before start */ |
bb90eb00 | 460 | while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) |
d8c05008 | 461 | cpu_relax(); |
3f479a65 | 462 | |
cc487e73 | 463 | /* clear TDBR buffer before read(else it will be shifted out) */ |
bb90eb00 | 464 | write_TDBR(drv_data, 0xFFFF); |
cc487e73 | 465 | |
bb90eb00 | 466 | dummy_read(drv_data); |
a5f6abd4 WB |
467 | |
468 | while (drv_data->rx < (drv_data->rx_end - 2)) { | |
bb90eb00 | 469 | while (!(read_STAT(drv_data) & BIT_STAT_RXS)) |
d8c05008 | 470 | cpu_relax(); |
bb90eb00 | 471 | *(u16 *) (drv_data->rx) = read_RDBR(drv_data); |
a5f6abd4 WB |
472 | drv_data->rx += 2; |
473 | } | |
474 | ||
bb90eb00 | 475 | while (!(read_STAT(drv_data) & BIT_STAT_RXS)) |
d8c05008 | 476 | cpu_relax(); |
bb90eb00 | 477 | *(u16 *) (drv_data->rx) = read_SHAW(drv_data); |
a5f6abd4 WB |
478 | drv_data->rx += 2; |
479 | } | |
480 | ||
481 | static void u16_cs_chg_reader(struct driver_data *drv_data) | |
482 | { | |
483 | struct chip_data *chip = drv_data->cur_chip; | |
484 | ||
3f479a65 | 485 | /* poll for SPI completion before start */ |
bb90eb00 | 486 | while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) |
d8c05008 | 487 | cpu_relax(); |
3f479a65 | 488 | |
cc487e73 | 489 | /* clear TDBR buffer before read(else it will be shifted out) */ |
bb90eb00 | 490 | write_TDBR(drv_data, 0xFFFF); |
a5f6abd4 | 491 | |
bb90eb00 BW |
492 | cs_active(drv_data, chip); |
493 | dummy_read(drv_data); | |
cc487e73 | 494 | |
c3061abb | 495 | while (drv_data->rx < drv_data->rx_end - 2) { |
bb90eb00 | 496 | cs_deactive(drv_data, chip); |
5fec5b5a | 497 | |
bb90eb00 | 498 | while (!(read_STAT(drv_data) & BIT_STAT_RXS)) |
d8c05008 | 499 | cpu_relax(); |
bb90eb00 BW |
500 | cs_active(drv_data, chip); |
501 | *(u16 *) (drv_data->rx) = read_RDBR(drv_data); | |
a5f6abd4 WB |
502 | drv_data->rx += 2; |
503 | } | |
bb90eb00 | 504 | cs_deactive(drv_data, chip); |
cc487e73 | 505 | |
bb90eb00 | 506 | while (!(read_STAT(drv_data) & BIT_STAT_RXS)) |
d8c05008 | 507 | cpu_relax(); |
bb90eb00 | 508 | *(u16 *) (drv_data->rx) = read_SHAW(drv_data); |
cc487e73 | 509 | drv_data->rx += 2; |
a5f6abd4 WB |
510 | } |
511 | ||
512 | static void u16_duplex(struct driver_data *drv_data) | |
513 | { | |
3f479a65 | 514 | /* poll for SPI completion before start */ |
bb90eb00 | 515 | while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) |
d8c05008 | 516 | cpu_relax(); |
3f479a65 | 517 | |
a5f6abd4 WB |
518 | /* in duplex mode, clk is triggered by writing of TDBR */ |
519 | while (drv_data->tx < drv_data->tx_end) { | |
bb90eb00 BW |
520 | write_TDBR(drv_data, (*(u16 *) (drv_data->tx))); |
521 | while (read_STAT(drv_data) & BIT_STAT_TXS) | |
d8c05008 | 522 | cpu_relax(); |
bb90eb00 | 523 | while (!(read_STAT(drv_data) & BIT_STAT_RXS)) |
d8c05008 | 524 | cpu_relax(); |
bb90eb00 | 525 | *(u16 *) (drv_data->rx) = read_RDBR(drv_data); |
a5f6abd4 WB |
526 | drv_data->rx += 2; |
527 | drv_data->tx += 2; | |
528 | } | |
529 | } | |
530 | ||
531 | static void u16_cs_chg_duplex(struct driver_data *drv_data) | |
532 | { | |
533 | struct chip_data *chip = drv_data->cur_chip; | |
534 | ||
3f479a65 | 535 | /* poll for SPI completion before start */ |
bb90eb00 | 536 | while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) |
d8c05008 | 537 | cpu_relax(); |
3f479a65 | 538 | |
a5f6abd4 | 539 | while (drv_data->tx < drv_data->tx_end) { |
bb90eb00 | 540 | cs_active(drv_data, chip); |
a5f6abd4 | 541 | |
bb90eb00 BW |
542 | write_TDBR(drv_data, (*(u16 *) (drv_data->tx))); |
543 | while (read_STAT(drv_data) & BIT_STAT_TXS) | |
d8c05008 | 544 | cpu_relax(); |
bb90eb00 | 545 | while (!(read_STAT(drv_data) & BIT_STAT_RXS)) |
d8c05008 | 546 | cpu_relax(); |
bb90eb00 | 547 | *(u16 *) (drv_data->rx) = read_RDBR(drv_data); |
62310e51 | 548 | |
bb90eb00 | 549 | cs_deactive(drv_data, chip); |
5fec5b5a | 550 | |
a5f6abd4 WB |
551 | drv_data->rx += 2; |
552 | drv_data->tx += 2; | |
553 | } | |
a5f6abd4 WB |
554 | } |
555 | ||
556 | /* test if ther is more transfer to be done */ | |
557 | static void *next_transfer(struct driver_data *drv_data) | |
558 | { | |
559 | struct spi_message *msg = drv_data->cur_msg; | |
560 | struct spi_transfer *trans = drv_data->cur_transfer; | |
561 | ||
562 | /* Move to next transfer */ | |
563 | if (trans->transfer_list.next != &msg->transfers) { | |
564 | drv_data->cur_transfer = | |
565 | list_entry(trans->transfer_list.next, | |
566 | struct spi_transfer, transfer_list); | |
567 | return RUNNING_STATE; | |
568 | } else | |
569 | return DONE_STATE; | |
570 | } | |
571 | ||
572 | /* | |
573 | * caller already set message->status; | |
574 | * dma and pio irqs are blocked give finished message back | |
575 | */ | |
576 | static void giveback(struct driver_data *drv_data) | |
577 | { | |
fad91c89 | 578 | struct chip_data *chip = drv_data->cur_chip; |
a5f6abd4 WB |
579 | struct spi_transfer *last_transfer; |
580 | unsigned long flags; | |
581 | struct spi_message *msg; | |
582 | ||
583 | spin_lock_irqsave(&drv_data->lock, flags); | |
584 | msg = drv_data->cur_msg; | |
585 | drv_data->cur_msg = NULL; | |
586 | drv_data->cur_transfer = NULL; | |
587 | drv_data->cur_chip = NULL; | |
588 | queue_work(drv_data->workqueue, &drv_data->pump_messages); | |
589 | spin_unlock_irqrestore(&drv_data->lock, flags); | |
590 | ||
591 | last_transfer = list_entry(msg->transfers.prev, | |
592 | struct spi_transfer, transfer_list); | |
593 | ||
594 | msg->state = NULL; | |
595 | ||
596 | /* disable chip select signal. And not stop spi in autobuffer mode */ | |
597 | if (drv_data->tx_dma != 0xFFFF) { | |
bb90eb00 | 598 | cs_deactive(drv_data, chip); |
a5f6abd4 WB |
599 | bfin_spi_disable(drv_data); |
600 | } | |
601 | ||
fad91c89 | 602 | if (!drv_data->cs_change) |
bb90eb00 | 603 | cs_deactive(drv_data, chip); |
fad91c89 | 604 | |
a5f6abd4 WB |
605 | if (msg->complete) |
606 | msg->complete(msg->context); | |
607 | } | |
608 | ||
88b40369 | 609 | static irqreturn_t dma_irq_handler(int irq, void *dev_id) |
a5f6abd4 | 610 | { |
15aafa2f | 611 | struct driver_data *drv_data = dev_id; |
fad91c89 | 612 | struct chip_data *chip = drv_data->cur_chip; |
bb90eb00 | 613 | struct spi_message *msg = drv_data->cur_msg; |
a5f6abd4 | 614 | |
88b40369 | 615 | dev_dbg(&drv_data->pdev->dev, "in dma_irq_handler\n"); |
bb90eb00 | 616 | clear_dma_irqstat(drv_data->dma_channel); |
a5f6abd4 | 617 | |
d6fe89b0 | 618 | /* Wait for DMA to complete */ |
bb90eb00 | 619 | while (get_dma_curr_irqstat(drv_data->dma_channel) & DMA_RUN) |
d8c05008 | 620 | cpu_relax(); |
d6fe89b0 | 621 | |
a5f6abd4 | 622 | /* |
d6fe89b0 BW |
623 | * wait for the last transaction shifted out. HRM states: |
624 | * at this point there may still be data in the SPI DMA FIFO waiting | |
625 | * to be transmitted ... software needs to poll TXS in the SPI_STAT | |
626 | * register until it goes low for 2 successive reads | |
a5f6abd4 WB |
627 | */ |
628 | if (drv_data->tx != NULL) { | |
bb90eb00 BW |
629 | while ((read_STAT(drv_data) & TXS) || |
630 | (read_STAT(drv_data) & TXS)) | |
d8c05008 | 631 | cpu_relax(); |
a5f6abd4 WB |
632 | } |
633 | ||
bb90eb00 | 634 | while (!(read_STAT(drv_data) & SPIF)) |
d8c05008 | 635 | cpu_relax(); |
a5f6abd4 | 636 | |
a5f6abd4 WB |
637 | msg->actual_length += drv_data->len_in_bytes; |
638 | ||
fad91c89 | 639 | if (drv_data->cs_change) |
bb90eb00 | 640 | cs_deactive(drv_data, chip); |
fad91c89 | 641 | |
a5f6abd4 WB |
642 | /* Move to next transfer */ |
643 | msg->state = next_transfer(drv_data); | |
644 | ||
645 | /* Schedule transfer tasklet */ | |
646 | tasklet_schedule(&drv_data->pump_transfers); | |
647 | ||
648 | /* free the irq handler before next transfer */ | |
88b40369 BW |
649 | dev_dbg(&drv_data->pdev->dev, |
650 | "disable dma channel irq%d\n", | |
bb90eb00 BW |
651 | drv_data->dma_channel); |
652 | dma_disable_irq(drv_data->dma_channel); | |
a5f6abd4 WB |
653 | |
654 | return IRQ_HANDLED; | |
655 | } | |
656 | ||
657 | static void pump_transfers(unsigned long data) | |
658 | { | |
659 | struct driver_data *drv_data = (struct driver_data *)data; | |
660 | struct spi_message *message = NULL; | |
661 | struct spi_transfer *transfer = NULL; | |
662 | struct spi_transfer *previous = NULL; | |
663 | struct chip_data *chip = NULL; | |
88b40369 BW |
664 | u8 width; |
665 | u16 cr, dma_width, dma_config; | |
a5f6abd4 WB |
666 | u32 tranf_success = 1; |
667 | ||
668 | /* Get current state information */ | |
669 | message = drv_data->cur_msg; | |
670 | transfer = drv_data->cur_transfer; | |
671 | chip = drv_data->cur_chip; | |
092e1fda | 672 | |
a5f6abd4 WB |
673 | /* |
674 | * if msg is error or done, report it back using complete() callback | |
675 | */ | |
676 | ||
677 | /* Handle for abort */ | |
678 | if (message->state == ERROR_STATE) { | |
679 | message->status = -EIO; | |
680 | giveback(drv_data); | |
681 | return; | |
682 | } | |
683 | ||
684 | /* Handle end of message */ | |
685 | if (message->state == DONE_STATE) { | |
686 | message->status = 0; | |
687 | giveback(drv_data); | |
688 | return; | |
689 | } | |
690 | ||
691 | /* Delay if requested at end of transfer */ | |
692 | if (message->state == RUNNING_STATE) { | |
693 | previous = list_entry(transfer->transfer_list.prev, | |
694 | struct spi_transfer, transfer_list); | |
695 | if (previous->delay_usecs) | |
696 | udelay(previous->delay_usecs); | |
697 | } | |
698 | ||
699 | /* Setup the transfer state based on the type of transfer */ | |
700 | if (flush(drv_data) == 0) { | |
701 | dev_err(&drv_data->pdev->dev, "pump_transfers: flush failed\n"); | |
702 | message->status = -EIO; | |
703 | giveback(drv_data); | |
704 | return; | |
705 | } | |
706 | ||
707 | if (transfer->tx_buf != NULL) { | |
708 | drv_data->tx = (void *)transfer->tx_buf; | |
709 | drv_data->tx_end = drv_data->tx + transfer->len; | |
88b40369 BW |
710 | dev_dbg(&drv_data->pdev->dev, "tx_buf is %p, tx_end is %p\n", |
711 | transfer->tx_buf, drv_data->tx_end); | |
a5f6abd4 WB |
712 | } else { |
713 | drv_data->tx = NULL; | |
714 | } | |
715 | ||
716 | if (transfer->rx_buf != NULL) { | |
717 | drv_data->rx = transfer->rx_buf; | |
718 | drv_data->rx_end = drv_data->rx + transfer->len; | |
88b40369 BW |
719 | dev_dbg(&drv_data->pdev->dev, "rx_buf is %p, rx_end is %p\n", |
720 | transfer->rx_buf, drv_data->rx_end); | |
a5f6abd4 WB |
721 | } else { |
722 | drv_data->rx = NULL; | |
723 | } | |
724 | ||
725 | drv_data->rx_dma = transfer->rx_dma; | |
726 | drv_data->tx_dma = transfer->tx_dma; | |
727 | drv_data->len_in_bytes = transfer->len; | |
fad91c89 | 728 | drv_data->cs_change = transfer->cs_change; |
a5f6abd4 | 729 | |
092e1fda BW |
730 | /* Bits per word setup */ |
731 | switch (transfer->bits_per_word) { | |
732 | case 8: | |
733 | drv_data->n_bytes = 1; | |
734 | width = CFG_SPI_WORDSIZE8; | |
735 | drv_data->read = chip->cs_change_per_word ? | |
736 | u8_cs_chg_reader : u8_reader; | |
737 | drv_data->write = chip->cs_change_per_word ? | |
738 | u8_cs_chg_writer : u8_writer; | |
739 | drv_data->duplex = chip->cs_change_per_word ? | |
740 | u8_cs_chg_duplex : u8_duplex; | |
741 | break; | |
742 | ||
743 | case 16: | |
744 | drv_data->n_bytes = 2; | |
745 | width = CFG_SPI_WORDSIZE16; | |
746 | drv_data->read = chip->cs_change_per_word ? | |
747 | u16_cs_chg_reader : u16_reader; | |
748 | drv_data->write = chip->cs_change_per_word ? | |
749 | u16_cs_chg_writer : u16_writer; | |
750 | drv_data->duplex = chip->cs_change_per_word ? | |
751 | u16_cs_chg_duplex : u16_duplex; | |
752 | break; | |
753 | ||
754 | default: | |
755 | /* No change, the same as default setting */ | |
756 | drv_data->n_bytes = chip->n_bytes; | |
757 | width = chip->width; | |
758 | drv_data->write = drv_data->tx ? chip->write : null_writer; | |
759 | drv_data->read = drv_data->rx ? chip->read : null_reader; | |
760 | drv_data->duplex = chip->duplex ? chip->duplex : null_writer; | |
761 | break; | |
762 | } | |
763 | cr = (read_CTRL(drv_data) & (~BIT_CTL_TIMOD)); | |
764 | cr |= (width << 8); | |
765 | write_CTRL(drv_data, cr); | |
766 | ||
a5f6abd4 WB |
767 | if (width == CFG_SPI_WORDSIZE16) { |
768 | drv_data->len = (transfer->len) >> 1; | |
769 | } else { | |
770 | drv_data->len = transfer->len; | |
771 | } | |
131b17d4 BW |
772 | dev_dbg(&drv_data->pdev->dev, "transfer: ", |
773 | "drv_data->write is %p, chip->write is %p, null_wr is %p\n", | |
774 | drv_data->write, chip->write, null_writer); | |
a5f6abd4 WB |
775 | |
776 | /* speed and width has been set on per message */ | |
777 | message->state = RUNNING_STATE; | |
778 | dma_config = 0; | |
779 | ||
092e1fda BW |
780 | /* Speed setup (surely valid because already checked) */ |
781 | if (transfer->speed_hz) | |
782 | write_BAUD(drv_data, hz_to_spi_baud(transfer->speed_hz)); | |
783 | else | |
784 | write_BAUD(drv_data, chip->baud); | |
785 | ||
bb90eb00 BW |
786 | write_STAT(drv_data, BIT_STAT_CLR); |
787 | cr = (read_CTRL(drv_data) & (~BIT_CTL_TIMOD)); | |
788 | cs_active(drv_data, chip); | |
a5f6abd4 | 789 | |
88b40369 BW |
790 | dev_dbg(&drv_data->pdev->dev, |
791 | "now pumping a transfer: width is %d, len is %d\n", | |
792 | width, transfer->len); | |
a5f6abd4 WB |
793 | |
794 | /* | |
795 | * Try to map dma buffer and do a dma transfer if | |
796 | * successful use different way to r/w according to | |
797 | * drv_data->cur_chip->enable_dma | |
798 | */ | |
799 | if (drv_data->cur_chip->enable_dma && drv_data->len > 6) { | |
800 | ||
bb90eb00 BW |
801 | disable_dma(drv_data->dma_channel); |
802 | clear_dma_irqstat(drv_data->dma_channel); | |
07612e5f | 803 | bfin_spi_disable(drv_data); |
a5f6abd4 WB |
804 | |
805 | /* config dma channel */ | |
88b40369 | 806 | dev_dbg(&drv_data->pdev->dev, "doing dma transfer\n"); |
a5f6abd4 | 807 | if (width == CFG_SPI_WORDSIZE16) { |
bb90eb00 BW |
808 | set_dma_x_count(drv_data->dma_channel, drv_data->len); |
809 | set_dma_x_modify(drv_data->dma_channel, 2); | |
a5f6abd4 WB |
810 | dma_width = WDSIZE_16; |
811 | } else { | |
bb90eb00 BW |
812 | set_dma_x_count(drv_data->dma_channel, drv_data->len); |
813 | set_dma_x_modify(drv_data->dma_channel, 1); | |
a5f6abd4 WB |
814 | dma_width = WDSIZE_8; |
815 | } | |
816 | ||
3f479a65 | 817 | /* poll for SPI completion before start */ |
bb90eb00 | 818 | while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) |
d8c05008 | 819 | cpu_relax(); |
3f479a65 | 820 | |
a5f6abd4 WB |
821 | /* dirty hack for autobuffer DMA mode */ |
822 | if (drv_data->tx_dma == 0xFFFF) { | |
88b40369 BW |
823 | dev_dbg(&drv_data->pdev->dev, |
824 | "doing autobuffer DMA out.\n"); | |
a5f6abd4 WB |
825 | |
826 | /* no irq in autobuffer mode */ | |
827 | dma_config = | |
828 | (DMAFLOW_AUTO | RESTART | dma_width | DI_EN); | |
bb90eb00 BW |
829 | set_dma_config(drv_data->dma_channel, dma_config); |
830 | set_dma_start_addr(drv_data->dma_channel, | |
a32c691d | 831 | (unsigned long)drv_data->tx); |
bb90eb00 | 832 | enable_dma(drv_data->dma_channel); |
a5f6abd4 | 833 | |
07612e5f SZ |
834 | /* start SPI transfer */ |
835 | write_CTRL(drv_data, | |
836 | (cr | CFG_SPI_DMAWRITE | BIT_CTL_ENABLE)); | |
837 | ||
838 | /* just return here, there can only be one transfer | |
839 | * in this mode | |
840 | */ | |
a5f6abd4 WB |
841 | message->status = 0; |
842 | giveback(drv_data); | |
843 | return; | |
844 | } | |
845 | ||
846 | /* In dma mode, rx or tx must be NULL in one transfer */ | |
847 | if (drv_data->rx != NULL) { | |
848 | /* set transfer mode, and enable SPI */ | |
88b40369 | 849 | dev_dbg(&drv_data->pdev->dev, "doing DMA in.\n"); |
a5f6abd4 | 850 | |
a5f6abd4 | 851 | /* clear tx reg soformer data is not shifted out */ |
bb90eb00 | 852 | write_TDBR(drv_data, 0xFFFF); |
a5f6abd4 | 853 | |
bb90eb00 | 854 | set_dma_x_count(drv_data->dma_channel, drv_data->len); |
a5f6abd4 WB |
855 | |
856 | /* start dma */ | |
bb90eb00 | 857 | dma_enable_irq(drv_data->dma_channel); |
a5f6abd4 | 858 | dma_config = (WNR | RESTART | dma_width | DI_EN); |
bb90eb00 BW |
859 | set_dma_config(drv_data->dma_channel, dma_config); |
860 | set_dma_start_addr(drv_data->dma_channel, | |
a32c691d | 861 | (unsigned long)drv_data->rx); |
bb90eb00 | 862 | enable_dma(drv_data->dma_channel); |
a5f6abd4 | 863 | |
07612e5f SZ |
864 | /* start SPI transfer */ |
865 | write_CTRL(drv_data, | |
866 | (cr | CFG_SPI_DMAREAD | BIT_CTL_ENABLE)); | |
867 | ||
a5f6abd4 | 868 | } else if (drv_data->tx != NULL) { |
88b40369 | 869 | dev_dbg(&drv_data->pdev->dev, "doing DMA out.\n"); |
a5f6abd4 WB |
870 | |
871 | /* start dma */ | |
bb90eb00 | 872 | dma_enable_irq(drv_data->dma_channel); |
a5f6abd4 | 873 | dma_config = (RESTART | dma_width | DI_EN); |
bb90eb00 BW |
874 | set_dma_config(drv_data->dma_channel, dma_config); |
875 | set_dma_start_addr(drv_data->dma_channel, | |
a32c691d | 876 | (unsigned long)drv_data->tx); |
bb90eb00 | 877 | enable_dma(drv_data->dma_channel); |
07612e5f SZ |
878 | |
879 | /* start SPI transfer */ | |
880 | write_CTRL(drv_data, | |
881 | (cr | CFG_SPI_DMAWRITE | BIT_CTL_ENABLE)); | |
a5f6abd4 WB |
882 | } |
883 | } else { | |
884 | /* IO mode write then read */ | |
88b40369 | 885 | dev_dbg(&drv_data->pdev->dev, "doing IO transfer\n"); |
a5f6abd4 | 886 | |
a5f6abd4 WB |
887 | if (drv_data->tx != NULL && drv_data->rx != NULL) { |
888 | /* full duplex mode */ | |
889 | BUG_ON((drv_data->tx_end - drv_data->tx) != | |
890 | (drv_data->rx_end - drv_data->rx)); | |
88b40369 BW |
891 | dev_dbg(&drv_data->pdev->dev, |
892 | "IO duplex: cr is 0x%x\n", cr); | |
a5f6abd4 | 893 | |
cc487e73 | 894 | /* set SPI transfer mode */ |
bb90eb00 | 895 | write_CTRL(drv_data, (cr | CFG_SPI_WRITE)); |
a5f6abd4 WB |
896 | |
897 | drv_data->duplex(drv_data); | |
898 | ||
899 | if (drv_data->tx != drv_data->tx_end) | |
900 | tranf_success = 0; | |
901 | } else if (drv_data->tx != NULL) { | |
902 | /* write only half duplex */ | |
131b17d4 | 903 | dev_dbg(&drv_data->pdev->dev, |
88b40369 | 904 | "IO write: cr is 0x%x\n", cr); |
a5f6abd4 | 905 | |
cc487e73 | 906 | /* set SPI transfer mode */ |
bb90eb00 | 907 | write_CTRL(drv_data, (cr | CFG_SPI_WRITE)); |
a5f6abd4 WB |
908 | |
909 | drv_data->write(drv_data); | |
910 | ||
911 | if (drv_data->tx != drv_data->tx_end) | |
912 | tranf_success = 0; | |
913 | } else if (drv_data->rx != NULL) { | |
914 | /* read only half duplex */ | |
131b17d4 | 915 | dev_dbg(&drv_data->pdev->dev, |
88b40369 | 916 | "IO read: cr is 0x%x\n", cr); |
a5f6abd4 | 917 | |
cc487e73 | 918 | /* set SPI transfer mode */ |
bb90eb00 | 919 | write_CTRL(drv_data, (cr | CFG_SPI_READ)); |
a5f6abd4 WB |
920 | |
921 | drv_data->read(drv_data); | |
922 | if (drv_data->rx != drv_data->rx_end) | |
923 | tranf_success = 0; | |
924 | } | |
925 | ||
926 | if (!tranf_success) { | |
131b17d4 | 927 | dev_dbg(&drv_data->pdev->dev, |
88b40369 | 928 | "IO write error!\n"); |
a5f6abd4 WB |
929 | message->state = ERROR_STATE; |
930 | } else { | |
931 | /* Update total byte transfered */ | |
932 | message->actual_length += drv_data->len; | |
933 | ||
934 | /* Move to next transfer of this msg */ | |
935 | message->state = next_transfer(drv_data); | |
936 | } | |
937 | ||
938 | /* Schedule next transfer tasklet */ | |
939 | tasklet_schedule(&drv_data->pump_transfers); | |
940 | ||
941 | } | |
942 | } | |
943 | ||
944 | /* pop a msg from queue and kick off real transfer */ | |
945 | static void pump_messages(struct work_struct *work) | |
946 | { | |
131b17d4 | 947 | struct driver_data *drv_data; |
a5f6abd4 WB |
948 | unsigned long flags; |
949 | ||
131b17d4 BW |
950 | drv_data = container_of(work, struct driver_data, pump_messages); |
951 | ||
a5f6abd4 WB |
952 | /* Lock queue and check for queue work */ |
953 | spin_lock_irqsave(&drv_data->lock, flags); | |
954 | if (list_empty(&drv_data->queue) || drv_data->run == QUEUE_STOPPED) { | |
955 | /* pumper kicked off but no work to do */ | |
956 | drv_data->busy = 0; | |
957 | spin_unlock_irqrestore(&drv_data->lock, flags); | |
958 | return; | |
959 | } | |
960 | ||
961 | /* Make sure we are not already running a message */ | |
962 | if (drv_data->cur_msg) { | |
963 | spin_unlock_irqrestore(&drv_data->lock, flags); | |
964 | return; | |
965 | } | |
966 | ||
967 | /* Extract head of queue */ | |
968 | drv_data->cur_msg = list_entry(drv_data->queue.next, | |
969 | struct spi_message, queue); | |
5fec5b5a BW |
970 | |
971 | /* Setup the SSP using the per chip configuration */ | |
972 | drv_data->cur_chip = spi_get_ctldata(drv_data->cur_msg->spi); | |
8d20d0a7 | 973 | restore_state(drv_data); |
5fec5b5a | 974 | |
a5f6abd4 WB |
975 | list_del_init(&drv_data->cur_msg->queue); |
976 | ||
977 | /* Initial message state */ | |
978 | drv_data->cur_msg->state = START_STATE; | |
979 | drv_data->cur_transfer = list_entry(drv_data->cur_msg->transfers.next, | |
980 | struct spi_transfer, transfer_list); | |
981 | ||
5fec5b5a BW |
982 | dev_dbg(&drv_data->pdev->dev, "got a message to pump, " |
983 | "state is set to: baud %d, flag 0x%x, ctl 0x%x\n", | |
984 | drv_data->cur_chip->baud, drv_data->cur_chip->flag, | |
985 | drv_data->cur_chip->ctl_reg); | |
131b17d4 BW |
986 | |
987 | dev_dbg(&drv_data->pdev->dev, | |
88b40369 BW |
988 | "the first transfer len is %d\n", |
989 | drv_data->cur_transfer->len); | |
a5f6abd4 WB |
990 | |
991 | /* Mark as busy and launch transfers */ | |
992 | tasklet_schedule(&drv_data->pump_transfers); | |
993 | ||
994 | drv_data->busy = 1; | |
995 | spin_unlock_irqrestore(&drv_data->lock, flags); | |
996 | } | |
997 | ||
998 | /* | |
999 | * got a msg to transfer, queue it in drv_data->queue. | |
1000 | * And kick off message pumper | |
1001 | */ | |
1002 | static int transfer(struct spi_device *spi, struct spi_message *msg) | |
1003 | { | |
1004 | struct driver_data *drv_data = spi_master_get_devdata(spi->master); | |
1005 | unsigned long flags; | |
1006 | ||
1007 | spin_lock_irqsave(&drv_data->lock, flags); | |
1008 | ||
1009 | if (drv_data->run == QUEUE_STOPPED) { | |
1010 | spin_unlock_irqrestore(&drv_data->lock, flags); | |
1011 | return -ESHUTDOWN; | |
1012 | } | |
1013 | ||
1014 | msg->actual_length = 0; | |
1015 | msg->status = -EINPROGRESS; | |
1016 | msg->state = START_STATE; | |
1017 | ||
88b40369 | 1018 | dev_dbg(&spi->dev, "adding an msg in transfer() \n"); |
a5f6abd4 WB |
1019 | list_add_tail(&msg->queue, &drv_data->queue); |
1020 | ||
1021 | if (drv_data->run == QUEUE_RUNNING && !drv_data->busy) | |
1022 | queue_work(drv_data->workqueue, &drv_data->pump_messages); | |
1023 | ||
1024 | spin_unlock_irqrestore(&drv_data->lock, flags); | |
1025 | ||
1026 | return 0; | |
1027 | } | |
1028 | ||
12e17c42 SZ |
1029 | #define MAX_SPI_SSEL 7 |
1030 | ||
1031 | static u16 ssel[3][MAX_SPI_SSEL] = { | |
1032 | {P_SPI0_SSEL1, P_SPI0_SSEL2, P_SPI0_SSEL3, | |
1033 | P_SPI0_SSEL4, P_SPI0_SSEL5, | |
1034 | P_SPI0_SSEL6, P_SPI0_SSEL7}, | |
1035 | ||
1036 | {P_SPI1_SSEL1, P_SPI1_SSEL2, P_SPI1_SSEL3, | |
1037 | P_SPI1_SSEL4, P_SPI1_SSEL5, | |
1038 | P_SPI1_SSEL6, P_SPI1_SSEL7}, | |
1039 | ||
1040 | {P_SPI2_SSEL1, P_SPI2_SSEL2, P_SPI2_SSEL3, | |
1041 | P_SPI2_SSEL4, P_SPI2_SSEL5, | |
1042 | P_SPI2_SSEL6, P_SPI2_SSEL7}, | |
1043 | }; | |
1044 | ||
a5f6abd4 WB |
1045 | /* first setup for new devices */ |
1046 | static int setup(struct spi_device *spi) | |
1047 | { | |
1048 | struct bfin5xx_spi_chip *chip_info = NULL; | |
1049 | struct chip_data *chip; | |
1050 | struct driver_data *drv_data = spi_master_get_devdata(spi->master); | |
1051 | u8 spi_flg; | |
1052 | ||
1053 | /* Abort device setup if requested features are not supported */ | |
1054 | if (spi->mode & ~(SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST)) { | |
1055 | dev_err(&spi->dev, "requested mode not fully supported\n"); | |
1056 | return -EINVAL; | |
1057 | } | |
1058 | ||
1059 | /* Zero (the default) here means 8 bits */ | |
1060 | if (!spi->bits_per_word) | |
1061 | spi->bits_per_word = 8; | |
1062 | ||
1063 | if (spi->bits_per_word != 8 && spi->bits_per_word != 16) | |
1064 | return -EINVAL; | |
1065 | ||
1066 | /* Only alloc (or use chip_info) on first setup */ | |
1067 | chip = spi_get_ctldata(spi); | |
1068 | if (chip == NULL) { | |
1069 | chip = kzalloc(sizeof(struct chip_data), GFP_KERNEL); | |
1070 | if (!chip) | |
1071 | return -ENOMEM; | |
1072 | ||
1073 | chip->enable_dma = 0; | |
1074 | chip_info = spi->controller_data; | |
1075 | } | |
1076 | ||
1077 | /* chip_info isn't always needed */ | |
1078 | if (chip_info) { | |
2ed35516 MF |
1079 | /* Make sure people stop trying to set fields via ctl_reg |
1080 | * when they should actually be using common SPI framework. | |
1081 | * Currently we let through: WOM EMISO PSSE GM SZ TIMOD. | |
1082 | * Not sure if a user actually needs/uses any of these, | |
1083 | * but let's assume (for now) they do. | |
1084 | */ | |
1085 | if (chip_info->ctl_reg & (SPE|MSTR|CPOL|CPHA|LSBF|SIZE)) { | |
1086 | dev_err(&spi->dev, "do not set bits in ctl_reg " | |
1087 | "that the SPI framework manages\n"); | |
1088 | return -EINVAL; | |
1089 | } | |
1090 | ||
a5f6abd4 WB |
1091 | chip->enable_dma = chip_info->enable_dma != 0 |
1092 | && drv_data->master_info->enable_dma; | |
1093 | chip->ctl_reg = chip_info->ctl_reg; | |
1094 | chip->bits_per_word = chip_info->bits_per_word; | |
1095 | chip->cs_change_per_word = chip_info->cs_change_per_word; | |
1096 | chip->cs_chg_udelay = chip_info->cs_chg_udelay; | |
1097 | } | |
1098 | ||
1099 | /* translate common spi framework into our register */ | |
1100 | if (spi->mode & SPI_CPOL) | |
1101 | chip->ctl_reg |= CPOL; | |
1102 | if (spi->mode & SPI_CPHA) | |
1103 | chip->ctl_reg |= CPHA; | |
1104 | if (spi->mode & SPI_LSB_FIRST) | |
1105 | chip->ctl_reg |= LSBF; | |
1106 | /* we dont support running in slave mode (yet?) */ | |
1107 | chip->ctl_reg |= MSTR; | |
1108 | ||
1109 | /* | |
1110 | * if any one SPI chip is registered and wants DMA, request the | |
1111 | * DMA channel for it | |
1112 | */ | |
bb90eb00 | 1113 | if (chip->enable_dma && !drv_data->dma_requested) { |
a5f6abd4 | 1114 | /* register dma irq handler */ |
bb90eb00 | 1115 | if (request_dma(drv_data->dma_channel, "BF53x_SPI_DMA") < 0) { |
88b40369 BW |
1116 | dev_dbg(&spi->dev, |
1117 | "Unable to request BlackFin SPI DMA channel\n"); | |
a5f6abd4 WB |
1118 | return -ENODEV; |
1119 | } | |
bb90eb00 BW |
1120 | if (set_dma_callback(drv_data->dma_channel, |
1121 | (void *)dma_irq_handler, drv_data) < 0) { | |
88b40369 | 1122 | dev_dbg(&spi->dev, "Unable to set dma callback\n"); |
a5f6abd4 WB |
1123 | return -EPERM; |
1124 | } | |
bb90eb00 BW |
1125 | dma_disable_irq(drv_data->dma_channel); |
1126 | drv_data->dma_requested = 1; | |
a5f6abd4 WB |
1127 | } |
1128 | ||
1129 | /* | |
1130 | * Notice: for blackfin, the speed_hz is the value of register | |
1131 | * SPI_BAUD, not the real baudrate | |
1132 | */ | |
1133 | chip->baud = hz_to_spi_baud(spi->max_speed_hz); | |
1134 | spi_flg = ~(1 << (spi->chip_select)); | |
1135 | chip->flag = ((u16) spi_flg << 8) | (1 << (spi->chip_select)); | |
1136 | chip->chip_select_num = spi->chip_select; | |
1137 | ||
1138 | switch (chip->bits_per_word) { | |
1139 | case 8: | |
1140 | chip->n_bytes = 1; | |
1141 | chip->width = CFG_SPI_WORDSIZE8; | |
1142 | chip->read = chip->cs_change_per_word ? | |
1143 | u8_cs_chg_reader : u8_reader; | |
1144 | chip->write = chip->cs_change_per_word ? | |
1145 | u8_cs_chg_writer : u8_writer; | |
1146 | chip->duplex = chip->cs_change_per_word ? | |
1147 | u8_cs_chg_duplex : u8_duplex; | |
1148 | break; | |
1149 | ||
1150 | case 16: | |
1151 | chip->n_bytes = 2; | |
1152 | chip->width = CFG_SPI_WORDSIZE16; | |
1153 | chip->read = chip->cs_change_per_word ? | |
1154 | u16_cs_chg_reader : u16_reader; | |
1155 | chip->write = chip->cs_change_per_word ? | |
1156 | u16_cs_chg_writer : u16_writer; | |
1157 | chip->duplex = chip->cs_change_per_word ? | |
1158 | u16_cs_chg_duplex : u16_duplex; | |
1159 | break; | |
1160 | ||
1161 | default: | |
1162 | dev_err(&spi->dev, "%d bits_per_word is not supported\n", | |
1163 | chip->bits_per_word); | |
1164 | kfree(chip); | |
1165 | return -ENODEV; | |
1166 | } | |
1167 | ||
898eb71c | 1168 | dev_dbg(&spi->dev, "setup spi chip %s, width is %d, dma is %d\n", |
a5f6abd4 | 1169 | spi->modalias, chip->width, chip->enable_dma); |
88b40369 | 1170 | dev_dbg(&spi->dev, "ctl_reg is 0x%x, flag_reg is 0x%x\n", |
a5f6abd4 WB |
1171 | chip->ctl_reg, chip->flag); |
1172 | ||
1173 | spi_set_ctldata(spi, chip); | |
1174 | ||
12e17c42 SZ |
1175 | dev_dbg(&spi->dev, "chip select number is %d\n", chip->chip_select_num); |
1176 | if ((chip->chip_select_num > 0) | |
1177 | && (chip->chip_select_num <= spi->master->num_chipselect)) | |
1178 | peripheral_request(ssel[spi->master->bus_num] | |
aab0d83e | 1179 | [chip->chip_select_num-1], spi->modalias); |
12e17c42 | 1180 | |
07612e5f SZ |
1181 | cs_deactive(drv_data, chip); |
1182 | ||
a5f6abd4 WB |
1183 | return 0; |
1184 | } | |
1185 | ||
1186 | /* | |
1187 | * callback for spi framework. | |
1188 | * clean driver specific data | |
1189 | */ | |
88b40369 | 1190 | static void cleanup(struct spi_device *spi) |
a5f6abd4 | 1191 | { |
27bb9e79 | 1192 | struct chip_data *chip = spi_get_ctldata(spi); |
a5f6abd4 | 1193 | |
12e17c42 SZ |
1194 | if ((chip->chip_select_num > 0) |
1195 | && (chip->chip_select_num <= spi->master->num_chipselect)) | |
1196 | peripheral_free(ssel[spi->master->bus_num] | |
1197 | [chip->chip_select_num-1]); | |
1198 | ||
a5f6abd4 WB |
1199 | kfree(chip); |
1200 | } | |
1201 | ||
1202 | static inline int init_queue(struct driver_data *drv_data) | |
1203 | { | |
1204 | INIT_LIST_HEAD(&drv_data->queue); | |
1205 | spin_lock_init(&drv_data->lock); | |
1206 | ||
1207 | drv_data->run = QUEUE_STOPPED; | |
1208 | drv_data->busy = 0; | |
1209 | ||
1210 | /* init transfer tasklet */ | |
1211 | tasklet_init(&drv_data->pump_transfers, | |
1212 | pump_transfers, (unsigned long)drv_data); | |
1213 | ||
1214 | /* init messages workqueue */ | |
1215 | INIT_WORK(&drv_data->pump_messages, pump_messages); | |
1216 | drv_data->workqueue = | |
49dce689 | 1217 | create_singlethread_workqueue(drv_data->master->dev.parent->bus_id); |
a5f6abd4 WB |
1218 | if (drv_data->workqueue == NULL) |
1219 | return -EBUSY; | |
1220 | ||
1221 | return 0; | |
1222 | } | |
1223 | ||
1224 | static inline int start_queue(struct driver_data *drv_data) | |
1225 | { | |
1226 | unsigned long flags; | |
1227 | ||
1228 | spin_lock_irqsave(&drv_data->lock, flags); | |
1229 | ||
1230 | if (drv_data->run == QUEUE_RUNNING || drv_data->busy) { | |
1231 | spin_unlock_irqrestore(&drv_data->lock, flags); | |
1232 | return -EBUSY; | |
1233 | } | |
1234 | ||
1235 | drv_data->run = QUEUE_RUNNING; | |
1236 | drv_data->cur_msg = NULL; | |
1237 | drv_data->cur_transfer = NULL; | |
1238 | drv_data->cur_chip = NULL; | |
1239 | spin_unlock_irqrestore(&drv_data->lock, flags); | |
1240 | ||
1241 | queue_work(drv_data->workqueue, &drv_data->pump_messages); | |
1242 | ||
1243 | return 0; | |
1244 | } | |
1245 | ||
1246 | static inline int stop_queue(struct driver_data *drv_data) | |
1247 | { | |
1248 | unsigned long flags; | |
1249 | unsigned limit = 500; | |
1250 | int status = 0; | |
1251 | ||
1252 | spin_lock_irqsave(&drv_data->lock, flags); | |
1253 | ||
1254 | /* | |
1255 | * This is a bit lame, but is optimized for the common execution path. | |
1256 | * A wait_queue on the drv_data->busy could be used, but then the common | |
1257 | * execution path (pump_messages) would be required to call wake_up or | |
1258 | * friends on every SPI message. Do this instead | |
1259 | */ | |
1260 | drv_data->run = QUEUE_STOPPED; | |
1261 | while (!list_empty(&drv_data->queue) && drv_data->busy && limit--) { | |
1262 | spin_unlock_irqrestore(&drv_data->lock, flags); | |
1263 | msleep(10); | |
1264 | spin_lock_irqsave(&drv_data->lock, flags); | |
1265 | } | |
1266 | ||
1267 | if (!list_empty(&drv_data->queue) || drv_data->busy) | |
1268 | status = -EBUSY; | |
1269 | ||
1270 | spin_unlock_irqrestore(&drv_data->lock, flags); | |
1271 | ||
1272 | return status; | |
1273 | } | |
1274 | ||
1275 | static inline int destroy_queue(struct driver_data *drv_data) | |
1276 | { | |
1277 | int status; | |
1278 | ||
1279 | status = stop_queue(drv_data); | |
1280 | if (status != 0) | |
1281 | return status; | |
1282 | ||
1283 | destroy_workqueue(drv_data->workqueue); | |
1284 | ||
1285 | return 0; | |
1286 | } | |
1287 | ||
1288 | static int __init bfin5xx_spi_probe(struct platform_device *pdev) | |
1289 | { | |
1290 | struct device *dev = &pdev->dev; | |
1291 | struct bfin5xx_spi_master *platform_info; | |
1292 | struct spi_master *master; | |
1293 | struct driver_data *drv_data = 0; | |
a32c691d | 1294 | struct resource *res; |
a5f6abd4 WB |
1295 | int status = 0; |
1296 | ||
1297 | platform_info = dev->platform_data; | |
1298 | ||
1299 | /* Allocate master with space for drv_data */ | |
1300 | master = spi_alloc_master(dev, sizeof(struct driver_data) + 16); | |
1301 | if (!master) { | |
1302 | dev_err(&pdev->dev, "can not alloc spi_master\n"); | |
1303 | return -ENOMEM; | |
1304 | } | |
131b17d4 | 1305 | |
a5f6abd4 WB |
1306 | drv_data = spi_master_get_devdata(master); |
1307 | drv_data->master = master; | |
1308 | drv_data->master_info = platform_info; | |
1309 | drv_data->pdev = pdev; | |
003d9226 | 1310 | drv_data->pin_req = platform_info->pin_req; |
a5f6abd4 WB |
1311 | |
1312 | master->bus_num = pdev->id; | |
1313 | master->num_chipselect = platform_info->num_chipselect; | |
1314 | master->cleanup = cleanup; | |
1315 | master->setup = setup; | |
1316 | master->transfer = transfer; | |
1317 | ||
a32c691d BW |
1318 | /* Find and map our resources */ |
1319 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
1320 | if (res == NULL) { | |
1321 | dev_err(dev, "Cannot get IORESOURCE_MEM\n"); | |
1322 | status = -ENOENT; | |
1323 | goto out_error_get_res; | |
1324 | } | |
1325 | ||
f452126c BW |
1326 | drv_data->regs_base = ioremap(res->start, (res->end - res->start + 1)); |
1327 | if (drv_data->regs_base == NULL) { | |
a32c691d BW |
1328 | dev_err(dev, "Cannot map IO\n"); |
1329 | status = -ENXIO; | |
1330 | goto out_error_ioremap; | |
1331 | } | |
1332 | ||
bb90eb00 BW |
1333 | drv_data->dma_channel = platform_get_irq(pdev, 0); |
1334 | if (drv_data->dma_channel < 0) { | |
a32c691d BW |
1335 | dev_err(dev, "No DMA channel specified\n"); |
1336 | status = -ENOENT; | |
1337 | goto out_error_no_dma_ch; | |
1338 | } | |
1339 | ||
a5f6abd4 WB |
1340 | /* Initial and start queue */ |
1341 | status = init_queue(drv_data); | |
1342 | if (status != 0) { | |
a32c691d | 1343 | dev_err(dev, "problem initializing queue\n"); |
a5f6abd4 WB |
1344 | goto out_error_queue_alloc; |
1345 | } | |
a32c691d | 1346 | |
a5f6abd4 WB |
1347 | status = start_queue(drv_data); |
1348 | if (status != 0) { | |
a32c691d | 1349 | dev_err(dev, "problem starting queue\n"); |
a5f6abd4 WB |
1350 | goto out_error_queue_alloc; |
1351 | } | |
1352 | ||
1353 | /* Register with the SPI framework */ | |
1354 | platform_set_drvdata(pdev, drv_data); | |
1355 | status = spi_register_master(master); | |
1356 | if (status != 0) { | |
a32c691d | 1357 | dev_err(dev, "problem registering spi master\n"); |
a5f6abd4 WB |
1358 | goto out_error_queue_alloc; |
1359 | } | |
a32c691d | 1360 | |
003d9226 BW |
1361 | status = peripheral_request_list(drv_data->pin_req, DRV_NAME); |
1362 | if (status != 0) { | |
7c4ef094 SZ |
1363 | dev_err(&pdev->dev, ": Requesting Peripherals failed\n"); |
1364 | goto out_error; | |
1365 | } | |
1366 | ||
f452126c | 1367 | dev_info(dev, "%s, Version %s, regs_base@%p, dma channel@%d\n", |
bb90eb00 BW |
1368 | DRV_DESC, DRV_VERSION, drv_data->regs_base, |
1369 | drv_data->dma_channel); | |
a5f6abd4 WB |
1370 | return status; |
1371 | ||
cc2f81a6 | 1372 | out_error_queue_alloc: |
a5f6abd4 | 1373 | destroy_queue(drv_data); |
a32c691d | 1374 | out_error_no_dma_ch: |
bb90eb00 | 1375 | iounmap((void *) drv_data->regs_base); |
a32c691d BW |
1376 | out_error_ioremap: |
1377 | out_error_get_res: | |
cc2f81a6 | 1378 | out_error: |
a5f6abd4 | 1379 | spi_master_put(master); |
cc2f81a6 | 1380 | |
a5f6abd4 WB |
1381 | return status; |
1382 | } | |
1383 | ||
1384 | /* stop hardware and remove the driver */ | |
1385 | static int __devexit bfin5xx_spi_remove(struct platform_device *pdev) | |
1386 | { | |
1387 | struct driver_data *drv_data = platform_get_drvdata(pdev); | |
1388 | int status = 0; | |
1389 | ||
1390 | if (!drv_data) | |
1391 | return 0; | |
1392 | ||
1393 | /* Remove the queue */ | |
1394 | status = destroy_queue(drv_data); | |
1395 | if (status != 0) | |
1396 | return status; | |
1397 | ||
1398 | /* Disable the SSP at the peripheral and SOC level */ | |
1399 | bfin_spi_disable(drv_data); | |
1400 | ||
1401 | /* Release DMA */ | |
1402 | if (drv_data->master_info->enable_dma) { | |
bb90eb00 BW |
1403 | if (dma_channel_active(drv_data->dma_channel)) |
1404 | free_dma(drv_data->dma_channel); | |
a5f6abd4 WB |
1405 | } |
1406 | ||
1407 | /* Disconnect from the SPI framework */ | |
1408 | spi_unregister_master(drv_data->master); | |
1409 | ||
003d9226 | 1410 | peripheral_free_list(drv_data->pin_req); |
cc2f81a6 | 1411 | |
a5f6abd4 WB |
1412 | /* Prevent double remove */ |
1413 | platform_set_drvdata(pdev, NULL); | |
1414 | ||
1415 | return 0; | |
1416 | } | |
1417 | ||
1418 | #ifdef CONFIG_PM | |
1419 | static int bfin5xx_spi_suspend(struct platform_device *pdev, pm_message_t state) | |
1420 | { | |
1421 | struct driver_data *drv_data = platform_get_drvdata(pdev); | |
1422 | int status = 0; | |
1423 | ||
1424 | status = stop_queue(drv_data); | |
1425 | if (status != 0) | |
1426 | return status; | |
1427 | ||
1428 | /* stop hardware */ | |
1429 | bfin_spi_disable(drv_data); | |
1430 | ||
1431 | return 0; | |
1432 | } | |
1433 | ||
1434 | static int bfin5xx_spi_resume(struct platform_device *pdev) | |
1435 | { | |
1436 | struct driver_data *drv_data = platform_get_drvdata(pdev); | |
1437 | int status = 0; | |
1438 | ||
1439 | /* Enable the SPI interface */ | |
1440 | bfin_spi_enable(drv_data); | |
1441 | ||
1442 | /* Start the queue running */ | |
1443 | status = start_queue(drv_data); | |
1444 | if (status != 0) { | |
1445 | dev_err(&pdev->dev, "problem starting queue (%d)\n", status); | |
1446 | return status; | |
1447 | } | |
1448 | ||
1449 | return 0; | |
1450 | } | |
1451 | #else | |
1452 | #define bfin5xx_spi_suspend NULL | |
1453 | #define bfin5xx_spi_resume NULL | |
1454 | #endif /* CONFIG_PM */ | |
1455 | ||
fc3ba952 | 1456 | MODULE_ALIAS("bfin-spi-master"); /* for platform bus hotplug */ |
a5f6abd4 | 1457 | static struct platform_driver bfin5xx_spi_driver = { |
fc3ba952 | 1458 | .driver = { |
a32c691d | 1459 | .name = DRV_NAME, |
88b40369 BW |
1460 | .owner = THIS_MODULE, |
1461 | }, | |
1462 | .suspend = bfin5xx_spi_suspend, | |
1463 | .resume = bfin5xx_spi_resume, | |
1464 | .remove = __devexit_p(bfin5xx_spi_remove), | |
a5f6abd4 WB |
1465 | }; |
1466 | ||
1467 | static int __init bfin5xx_spi_init(void) | |
1468 | { | |
88b40369 | 1469 | return platform_driver_probe(&bfin5xx_spi_driver, bfin5xx_spi_probe); |
a5f6abd4 | 1470 | } |
a5f6abd4 WB |
1471 | module_init(bfin5xx_spi_init); |
1472 | ||
1473 | static void __exit bfin5xx_spi_exit(void) | |
1474 | { | |
1475 | platform_driver_unregister(&bfin5xx_spi_driver); | |
1476 | } | |
a5f6abd4 | 1477 | module_exit(bfin5xx_spi_exit); |