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*/ |
5fec5b5a | 226 | static int restore_state(struct driver_data *drv_data) |
a5f6abd4 WB |
227 | { |
228 | struct chip_data *chip = drv_data->cur_chip; | |
5fec5b5a | 229 | int ret = 0; |
12e17c42 | 230 | |
a5f6abd4 | 231 | /* Clear status and disable clock */ |
bb90eb00 | 232 | write_STAT(drv_data, BIT_STAT_CLR); |
a5f6abd4 | 233 | bfin_spi_disable(drv_data); |
88b40369 | 234 | dev_dbg(&drv_data->pdev->dev, "restoring spi ctl state\n"); |
a5f6abd4 | 235 | |
5fec5b5a | 236 | /* Load the registers */ |
bb90eb00 | 237 | write_CTRL(drv_data, chip->ctl_reg); |
092e1fda | 238 | write_BAUD(drv_data, chip->baud); |
cc487e73 SZ |
239 | |
240 | bfin_spi_enable(drv_data); | |
07612e5f | 241 | cs_active(drv_data, chip); |
5fec5b5a | 242 | |
5fec5b5a BW |
243 | if (ret) |
244 | dev_dbg(&drv_data->pdev->dev, | |
245 | ": request chip select number %d failed\n", | |
246 | chip->chip_select_num); | |
247 | ||
248 | return ret; | |
a5f6abd4 WB |
249 | } |
250 | ||
251 | /* used to kick off transfer in rx mode */ | |
bb90eb00 | 252 | static unsigned short dummy_read(struct driver_data *drv_data) |
a5f6abd4 WB |
253 | { |
254 | unsigned short tmp; | |
bb90eb00 | 255 | tmp = read_RDBR(drv_data); |
a5f6abd4 WB |
256 | return tmp; |
257 | } | |
258 | ||
259 | static void null_writer(struct driver_data *drv_data) | |
260 | { | |
261 | u8 n_bytes = drv_data->n_bytes; | |
262 | ||
263 | while (drv_data->tx < drv_data->tx_end) { | |
bb90eb00 BW |
264 | write_TDBR(drv_data, 0); |
265 | while ((read_STAT(drv_data) & BIT_STAT_TXS)) | |
d8c05008 | 266 | cpu_relax(); |
a5f6abd4 WB |
267 | drv_data->tx += n_bytes; |
268 | } | |
269 | } | |
270 | ||
271 | static void null_reader(struct driver_data *drv_data) | |
272 | { | |
273 | u8 n_bytes = drv_data->n_bytes; | |
bb90eb00 | 274 | dummy_read(drv_data); |
a5f6abd4 WB |
275 | |
276 | while (drv_data->rx < drv_data->rx_end) { | |
bb90eb00 | 277 | while (!(read_STAT(drv_data) & BIT_STAT_RXS)) |
d8c05008 | 278 | cpu_relax(); |
bb90eb00 | 279 | dummy_read(drv_data); |
a5f6abd4 WB |
280 | drv_data->rx += n_bytes; |
281 | } | |
282 | } | |
283 | ||
284 | static void u8_writer(struct driver_data *drv_data) | |
285 | { | |
131b17d4 | 286 | dev_dbg(&drv_data->pdev->dev, |
bb90eb00 | 287 | "cr8-s is 0x%x\n", read_STAT(drv_data)); |
cc487e73 | 288 | |
3f479a65 | 289 | /* poll for SPI completion before start */ |
bb90eb00 | 290 | while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) |
d8c05008 | 291 | cpu_relax(); |
3f479a65 | 292 | |
a5f6abd4 | 293 | while (drv_data->tx < drv_data->tx_end) { |
bb90eb00 BW |
294 | write_TDBR(drv_data, (*(u8 *) (drv_data->tx))); |
295 | while (read_STAT(drv_data) & BIT_STAT_TXS) | |
d8c05008 | 296 | cpu_relax(); |
a5f6abd4 WB |
297 | ++drv_data->tx; |
298 | } | |
a5f6abd4 WB |
299 | } |
300 | ||
301 | static void u8_cs_chg_writer(struct driver_data *drv_data) | |
302 | { | |
303 | struct chip_data *chip = drv_data->cur_chip; | |
304 | ||
3f479a65 | 305 | /* poll for SPI completion before start */ |
bb90eb00 | 306 | while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) |
d8c05008 | 307 | cpu_relax(); |
3f479a65 | 308 | |
a5f6abd4 | 309 | while (drv_data->tx < drv_data->tx_end) { |
bb90eb00 | 310 | cs_active(drv_data, chip); |
a5f6abd4 | 311 | |
bb90eb00 BW |
312 | write_TDBR(drv_data, (*(u8 *) (drv_data->tx))); |
313 | while (read_STAT(drv_data) & BIT_STAT_TXS) | |
d8c05008 | 314 | cpu_relax(); |
62310e51 | 315 | |
bb90eb00 | 316 | cs_deactive(drv_data, chip); |
5fec5b5a | 317 | |
a5f6abd4 WB |
318 | ++drv_data->tx; |
319 | } | |
a5f6abd4 WB |
320 | } |
321 | ||
322 | static void u8_reader(struct driver_data *drv_data) | |
323 | { | |
131b17d4 | 324 | dev_dbg(&drv_data->pdev->dev, |
bb90eb00 | 325 | "cr-8 is 0x%x\n", read_STAT(drv_data)); |
a5f6abd4 | 326 | |
3f479a65 | 327 | /* poll for SPI completion before start */ |
bb90eb00 | 328 | while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) |
d8c05008 | 329 | cpu_relax(); |
3f479a65 | 330 | |
a5f6abd4 | 331 | /* clear TDBR buffer before read(else it will be shifted out) */ |
bb90eb00 | 332 | write_TDBR(drv_data, 0xFFFF); |
a5f6abd4 | 333 | |
bb90eb00 | 334 | dummy_read(drv_data); |
cc487e73 | 335 | |
a5f6abd4 | 336 | while (drv_data->rx < drv_data->rx_end - 1) { |
bb90eb00 | 337 | while (!(read_STAT(drv_data) & BIT_STAT_RXS)) |
d8c05008 | 338 | cpu_relax(); |
bb90eb00 | 339 | *(u8 *) (drv_data->rx) = read_RDBR(drv_data); |
a5f6abd4 WB |
340 | ++drv_data->rx; |
341 | } | |
342 | ||
bb90eb00 | 343 | while (!(read_STAT(drv_data) & BIT_STAT_RXS)) |
d8c05008 | 344 | cpu_relax(); |
bb90eb00 | 345 | *(u8 *) (drv_data->rx) = read_SHAW(drv_data); |
a5f6abd4 WB |
346 | ++drv_data->rx; |
347 | } | |
348 | ||
349 | static void u8_cs_chg_reader(struct driver_data *drv_data) | |
350 | { | |
351 | struct chip_data *chip = drv_data->cur_chip; | |
352 | ||
3f479a65 | 353 | /* poll for SPI completion before start */ |
bb90eb00 | 354 | while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) |
d8c05008 | 355 | cpu_relax(); |
3f479a65 | 356 | |
cc487e73 | 357 | /* clear TDBR buffer before read(else it will be shifted out) */ |
bb90eb00 | 358 | write_TDBR(drv_data, 0xFFFF); |
a5f6abd4 | 359 | |
bb90eb00 BW |
360 | cs_active(drv_data, chip); |
361 | dummy_read(drv_data); | |
cc487e73 SZ |
362 | |
363 | while (drv_data->rx < drv_data->rx_end - 1) { | |
bb90eb00 | 364 | cs_deactive(drv_data, chip); |
5fec5b5a | 365 | |
bb90eb00 | 366 | while (!(read_STAT(drv_data) & BIT_STAT_RXS)) |
d8c05008 | 367 | cpu_relax(); |
bb90eb00 BW |
368 | cs_active(drv_data, chip); |
369 | *(u8 *) (drv_data->rx) = read_RDBR(drv_data); | |
a5f6abd4 WB |
370 | ++drv_data->rx; |
371 | } | |
bb90eb00 | 372 | cs_deactive(drv_data, chip); |
5fec5b5a | 373 | |
bb90eb00 | 374 | while (!(read_STAT(drv_data) & BIT_STAT_RXS)) |
d8c05008 | 375 | cpu_relax(); |
bb90eb00 | 376 | *(u8 *) (drv_data->rx) = read_SHAW(drv_data); |
cc487e73 | 377 | ++drv_data->rx; |
a5f6abd4 WB |
378 | } |
379 | ||
380 | static void u8_duplex(struct driver_data *drv_data) | |
381 | { | |
3f479a65 | 382 | /* poll for SPI completion before start */ |
bb90eb00 | 383 | while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) |
d8c05008 | 384 | cpu_relax(); |
3f479a65 | 385 | |
a5f6abd4 WB |
386 | /* in duplex mode, clk is triggered by writing of TDBR */ |
387 | while (drv_data->rx < drv_data->rx_end) { | |
bb90eb00 BW |
388 | write_TDBR(drv_data, (*(u8 *) (drv_data->tx))); |
389 | while (read_STAT(drv_data) & BIT_STAT_TXS) | |
d8c05008 | 390 | cpu_relax(); |
bb90eb00 | 391 | while (!(read_STAT(drv_data) & BIT_STAT_RXS)) |
d8c05008 | 392 | cpu_relax(); |
bb90eb00 | 393 | *(u8 *) (drv_data->rx) = read_RDBR(drv_data); |
a5f6abd4 WB |
394 | ++drv_data->rx; |
395 | ++drv_data->tx; | |
396 | } | |
397 | } | |
398 | ||
399 | static void u8_cs_chg_duplex(struct driver_data *drv_data) | |
400 | { | |
401 | struct chip_data *chip = drv_data->cur_chip; | |
402 | ||
3f479a65 | 403 | /* poll for SPI completion before start */ |
bb90eb00 | 404 | while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) |
d8c05008 | 405 | cpu_relax(); |
3f479a65 | 406 | |
a5f6abd4 | 407 | while (drv_data->rx < drv_data->rx_end) { |
bb90eb00 | 408 | cs_active(drv_data, chip); |
5fec5b5a | 409 | |
bb90eb00 BW |
410 | write_TDBR(drv_data, (*(u8 *) (drv_data->tx))); |
411 | while (read_STAT(drv_data) & BIT_STAT_TXS) | |
d8c05008 | 412 | cpu_relax(); |
bb90eb00 | 413 | while (!(read_STAT(drv_data) & BIT_STAT_RXS)) |
d8c05008 | 414 | cpu_relax(); |
bb90eb00 | 415 | *(u8 *) (drv_data->rx) = read_RDBR(drv_data); |
62310e51 | 416 | |
bb90eb00 | 417 | cs_deactive(drv_data, chip); |
5fec5b5a | 418 | |
a5f6abd4 WB |
419 | ++drv_data->rx; |
420 | ++drv_data->tx; | |
421 | } | |
a5f6abd4 WB |
422 | } |
423 | ||
424 | static void u16_writer(struct driver_data *drv_data) | |
425 | { | |
131b17d4 | 426 | dev_dbg(&drv_data->pdev->dev, |
bb90eb00 | 427 | "cr16 is 0x%x\n", read_STAT(drv_data)); |
88b40369 | 428 | |
3f479a65 | 429 | /* poll for SPI completion before start */ |
bb90eb00 | 430 | while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) |
d8c05008 | 431 | cpu_relax(); |
3f479a65 | 432 | |
a5f6abd4 | 433 | while (drv_data->tx < drv_data->tx_end) { |
bb90eb00 BW |
434 | write_TDBR(drv_data, (*(u16 *) (drv_data->tx))); |
435 | while ((read_STAT(drv_data) & BIT_STAT_TXS)) | |
d8c05008 | 436 | cpu_relax(); |
a5f6abd4 WB |
437 | drv_data->tx += 2; |
438 | } | |
a5f6abd4 WB |
439 | } |
440 | ||
441 | static void u16_cs_chg_writer(struct driver_data *drv_data) | |
442 | { | |
443 | struct chip_data *chip = drv_data->cur_chip; | |
444 | ||
3f479a65 | 445 | /* poll for SPI completion before start */ |
bb90eb00 | 446 | while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) |
d8c05008 | 447 | cpu_relax(); |
3f479a65 | 448 | |
a5f6abd4 | 449 | while (drv_data->tx < drv_data->tx_end) { |
bb90eb00 | 450 | cs_active(drv_data, chip); |
a5f6abd4 | 451 | |
bb90eb00 BW |
452 | write_TDBR(drv_data, (*(u16 *) (drv_data->tx))); |
453 | while ((read_STAT(drv_data) & BIT_STAT_TXS)) | |
d8c05008 | 454 | cpu_relax(); |
62310e51 | 455 | |
bb90eb00 | 456 | cs_deactive(drv_data, chip); |
5fec5b5a | 457 | |
a5f6abd4 WB |
458 | drv_data->tx += 2; |
459 | } | |
a5f6abd4 WB |
460 | } |
461 | ||
462 | static void u16_reader(struct driver_data *drv_data) | |
463 | { | |
88b40369 | 464 | dev_dbg(&drv_data->pdev->dev, |
bb90eb00 | 465 | "cr-16 is 0x%x\n", read_STAT(drv_data)); |
cc487e73 | 466 | |
3f479a65 | 467 | /* poll for SPI completion before start */ |
bb90eb00 | 468 | while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) |
d8c05008 | 469 | cpu_relax(); |
3f479a65 | 470 | |
cc487e73 | 471 | /* clear TDBR buffer before read(else it will be shifted out) */ |
bb90eb00 | 472 | write_TDBR(drv_data, 0xFFFF); |
cc487e73 | 473 | |
bb90eb00 | 474 | dummy_read(drv_data); |
a5f6abd4 WB |
475 | |
476 | while (drv_data->rx < (drv_data->rx_end - 2)) { | |
bb90eb00 | 477 | while (!(read_STAT(drv_data) & BIT_STAT_RXS)) |
d8c05008 | 478 | cpu_relax(); |
bb90eb00 | 479 | *(u16 *) (drv_data->rx) = read_RDBR(drv_data); |
a5f6abd4 WB |
480 | drv_data->rx += 2; |
481 | } | |
482 | ||
bb90eb00 | 483 | while (!(read_STAT(drv_data) & BIT_STAT_RXS)) |
d8c05008 | 484 | cpu_relax(); |
bb90eb00 | 485 | *(u16 *) (drv_data->rx) = read_SHAW(drv_data); |
a5f6abd4 WB |
486 | drv_data->rx += 2; |
487 | } | |
488 | ||
489 | static void u16_cs_chg_reader(struct driver_data *drv_data) | |
490 | { | |
491 | struct chip_data *chip = drv_data->cur_chip; | |
492 | ||
3f479a65 | 493 | /* poll for SPI completion before start */ |
bb90eb00 | 494 | while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) |
d8c05008 | 495 | cpu_relax(); |
3f479a65 | 496 | |
cc487e73 | 497 | /* clear TDBR buffer before read(else it will be shifted out) */ |
bb90eb00 | 498 | write_TDBR(drv_data, 0xFFFF); |
a5f6abd4 | 499 | |
bb90eb00 BW |
500 | cs_active(drv_data, chip); |
501 | dummy_read(drv_data); | |
cc487e73 | 502 | |
c3061abb | 503 | while (drv_data->rx < drv_data->rx_end - 2) { |
bb90eb00 | 504 | cs_deactive(drv_data, chip); |
5fec5b5a | 505 | |
bb90eb00 | 506 | while (!(read_STAT(drv_data) & BIT_STAT_RXS)) |
d8c05008 | 507 | cpu_relax(); |
bb90eb00 BW |
508 | cs_active(drv_data, chip); |
509 | *(u16 *) (drv_data->rx) = read_RDBR(drv_data); | |
a5f6abd4 WB |
510 | drv_data->rx += 2; |
511 | } | |
bb90eb00 | 512 | cs_deactive(drv_data, chip); |
cc487e73 | 513 | |
bb90eb00 | 514 | while (!(read_STAT(drv_data) & BIT_STAT_RXS)) |
d8c05008 | 515 | cpu_relax(); |
bb90eb00 | 516 | *(u16 *) (drv_data->rx) = read_SHAW(drv_data); |
cc487e73 | 517 | drv_data->rx += 2; |
a5f6abd4 WB |
518 | } |
519 | ||
520 | static void u16_duplex(struct driver_data *drv_data) | |
521 | { | |
3f479a65 | 522 | /* poll for SPI completion before start */ |
bb90eb00 | 523 | while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) |
d8c05008 | 524 | cpu_relax(); |
3f479a65 | 525 | |
a5f6abd4 WB |
526 | /* in duplex mode, clk is triggered by writing of TDBR */ |
527 | while (drv_data->tx < drv_data->tx_end) { | |
bb90eb00 BW |
528 | write_TDBR(drv_data, (*(u16 *) (drv_data->tx))); |
529 | while (read_STAT(drv_data) & BIT_STAT_TXS) | |
d8c05008 | 530 | cpu_relax(); |
bb90eb00 | 531 | while (!(read_STAT(drv_data) & BIT_STAT_RXS)) |
d8c05008 | 532 | cpu_relax(); |
bb90eb00 | 533 | *(u16 *) (drv_data->rx) = read_RDBR(drv_data); |
a5f6abd4 WB |
534 | drv_data->rx += 2; |
535 | drv_data->tx += 2; | |
536 | } | |
537 | } | |
538 | ||
539 | static void u16_cs_chg_duplex(struct driver_data *drv_data) | |
540 | { | |
541 | struct chip_data *chip = drv_data->cur_chip; | |
542 | ||
3f479a65 | 543 | /* poll for SPI completion before start */ |
bb90eb00 | 544 | while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) |
d8c05008 | 545 | cpu_relax(); |
3f479a65 | 546 | |
a5f6abd4 | 547 | while (drv_data->tx < drv_data->tx_end) { |
bb90eb00 | 548 | cs_active(drv_data, chip); |
a5f6abd4 | 549 | |
bb90eb00 BW |
550 | write_TDBR(drv_data, (*(u16 *) (drv_data->tx))); |
551 | while (read_STAT(drv_data) & BIT_STAT_TXS) | |
d8c05008 | 552 | cpu_relax(); |
bb90eb00 | 553 | while (!(read_STAT(drv_data) & BIT_STAT_RXS)) |
d8c05008 | 554 | cpu_relax(); |
bb90eb00 | 555 | *(u16 *) (drv_data->rx) = read_RDBR(drv_data); |
62310e51 | 556 | |
bb90eb00 | 557 | cs_deactive(drv_data, chip); |
5fec5b5a | 558 | |
a5f6abd4 WB |
559 | drv_data->rx += 2; |
560 | drv_data->tx += 2; | |
561 | } | |
a5f6abd4 WB |
562 | } |
563 | ||
564 | /* test if ther is more transfer to be done */ | |
565 | static void *next_transfer(struct driver_data *drv_data) | |
566 | { | |
567 | struct spi_message *msg = drv_data->cur_msg; | |
568 | struct spi_transfer *trans = drv_data->cur_transfer; | |
569 | ||
570 | /* Move to next transfer */ | |
571 | if (trans->transfer_list.next != &msg->transfers) { | |
572 | drv_data->cur_transfer = | |
573 | list_entry(trans->transfer_list.next, | |
574 | struct spi_transfer, transfer_list); | |
575 | return RUNNING_STATE; | |
576 | } else | |
577 | return DONE_STATE; | |
578 | } | |
579 | ||
580 | /* | |
581 | * caller already set message->status; | |
582 | * dma and pio irqs are blocked give finished message back | |
583 | */ | |
584 | static void giveback(struct driver_data *drv_data) | |
585 | { | |
fad91c89 | 586 | struct chip_data *chip = drv_data->cur_chip; |
a5f6abd4 WB |
587 | struct spi_transfer *last_transfer; |
588 | unsigned long flags; | |
589 | struct spi_message *msg; | |
590 | ||
591 | spin_lock_irqsave(&drv_data->lock, flags); | |
592 | msg = drv_data->cur_msg; | |
593 | drv_data->cur_msg = NULL; | |
594 | drv_data->cur_transfer = NULL; | |
595 | drv_data->cur_chip = NULL; | |
596 | queue_work(drv_data->workqueue, &drv_data->pump_messages); | |
597 | spin_unlock_irqrestore(&drv_data->lock, flags); | |
598 | ||
599 | last_transfer = list_entry(msg->transfers.prev, | |
600 | struct spi_transfer, transfer_list); | |
601 | ||
602 | msg->state = NULL; | |
603 | ||
604 | /* disable chip select signal. And not stop spi in autobuffer mode */ | |
605 | if (drv_data->tx_dma != 0xFFFF) { | |
bb90eb00 | 606 | cs_deactive(drv_data, chip); |
a5f6abd4 WB |
607 | bfin_spi_disable(drv_data); |
608 | } | |
609 | ||
fad91c89 | 610 | if (!drv_data->cs_change) |
bb90eb00 | 611 | cs_deactive(drv_data, chip); |
fad91c89 | 612 | |
a5f6abd4 WB |
613 | if (msg->complete) |
614 | msg->complete(msg->context); | |
615 | } | |
616 | ||
88b40369 | 617 | static irqreturn_t dma_irq_handler(int irq, void *dev_id) |
a5f6abd4 WB |
618 | { |
619 | struct driver_data *drv_data = (struct driver_data *)dev_id; | |
fad91c89 | 620 | struct chip_data *chip = drv_data->cur_chip; |
bb90eb00 | 621 | struct spi_message *msg = drv_data->cur_msg; |
a5f6abd4 | 622 | |
88b40369 | 623 | dev_dbg(&drv_data->pdev->dev, "in dma_irq_handler\n"); |
bb90eb00 | 624 | clear_dma_irqstat(drv_data->dma_channel); |
a5f6abd4 | 625 | |
d6fe89b0 | 626 | /* Wait for DMA to complete */ |
bb90eb00 | 627 | while (get_dma_curr_irqstat(drv_data->dma_channel) & DMA_RUN) |
d8c05008 | 628 | cpu_relax(); |
d6fe89b0 | 629 | |
a5f6abd4 | 630 | /* |
d6fe89b0 BW |
631 | * wait for the last transaction shifted out. HRM states: |
632 | * at this point there may still be data in the SPI DMA FIFO waiting | |
633 | * to be transmitted ... software needs to poll TXS in the SPI_STAT | |
634 | * register until it goes low for 2 successive reads | |
a5f6abd4 WB |
635 | */ |
636 | if (drv_data->tx != NULL) { | |
bb90eb00 BW |
637 | while ((read_STAT(drv_data) & TXS) || |
638 | (read_STAT(drv_data) & TXS)) | |
d8c05008 | 639 | cpu_relax(); |
a5f6abd4 WB |
640 | } |
641 | ||
bb90eb00 | 642 | while (!(read_STAT(drv_data) & SPIF)) |
d8c05008 | 643 | cpu_relax(); |
a5f6abd4 | 644 | |
a5f6abd4 WB |
645 | msg->actual_length += drv_data->len_in_bytes; |
646 | ||
fad91c89 | 647 | if (drv_data->cs_change) |
bb90eb00 | 648 | cs_deactive(drv_data, chip); |
fad91c89 | 649 | |
a5f6abd4 WB |
650 | /* Move to next transfer */ |
651 | msg->state = next_transfer(drv_data); | |
652 | ||
653 | /* Schedule transfer tasklet */ | |
654 | tasklet_schedule(&drv_data->pump_transfers); | |
655 | ||
656 | /* free the irq handler before next transfer */ | |
88b40369 BW |
657 | dev_dbg(&drv_data->pdev->dev, |
658 | "disable dma channel irq%d\n", | |
bb90eb00 BW |
659 | drv_data->dma_channel); |
660 | dma_disable_irq(drv_data->dma_channel); | |
a5f6abd4 WB |
661 | |
662 | return IRQ_HANDLED; | |
663 | } | |
664 | ||
665 | static void pump_transfers(unsigned long data) | |
666 | { | |
667 | struct driver_data *drv_data = (struct driver_data *)data; | |
668 | struct spi_message *message = NULL; | |
669 | struct spi_transfer *transfer = NULL; | |
670 | struct spi_transfer *previous = NULL; | |
671 | struct chip_data *chip = NULL; | |
88b40369 BW |
672 | u8 width; |
673 | u16 cr, dma_width, dma_config; | |
a5f6abd4 WB |
674 | u32 tranf_success = 1; |
675 | ||
676 | /* Get current state information */ | |
677 | message = drv_data->cur_msg; | |
678 | transfer = drv_data->cur_transfer; | |
679 | chip = drv_data->cur_chip; | |
092e1fda | 680 | |
a5f6abd4 WB |
681 | /* |
682 | * if msg is error or done, report it back using complete() callback | |
683 | */ | |
684 | ||
685 | /* Handle for abort */ | |
686 | if (message->state == ERROR_STATE) { | |
687 | message->status = -EIO; | |
688 | giveback(drv_data); | |
689 | return; | |
690 | } | |
691 | ||
692 | /* Handle end of message */ | |
693 | if (message->state == DONE_STATE) { | |
694 | message->status = 0; | |
695 | giveback(drv_data); | |
696 | return; | |
697 | } | |
698 | ||
699 | /* Delay if requested at end of transfer */ | |
700 | if (message->state == RUNNING_STATE) { | |
701 | previous = list_entry(transfer->transfer_list.prev, | |
702 | struct spi_transfer, transfer_list); | |
703 | if (previous->delay_usecs) | |
704 | udelay(previous->delay_usecs); | |
705 | } | |
706 | ||
707 | /* Setup the transfer state based on the type of transfer */ | |
708 | if (flush(drv_data) == 0) { | |
709 | dev_err(&drv_data->pdev->dev, "pump_transfers: flush failed\n"); | |
710 | message->status = -EIO; | |
711 | giveback(drv_data); | |
712 | return; | |
713 | } | |
714 | ||
715 | if (transfer->tx_buf != NULL) { | |
716 | drv_data->tx = (void *)transfer->tx_buf; | |
717 | drv_data->tx_end = drv_data->tx + transfer->len; | |
88b40369 BW |
718 | dev_dbg(&drv_data->pdev->dev, "tx_buf is %p, tx_end is %p\n", |
719 | transfer->tx_buf, drv_data->tx_end); | |
a5f6abd4 WB |
720 | } else { |
721 | drv_data->tx = NULL; | |
722 | } | |
723 | ||
724 | if (transfer->rx_buf != NULL) { | |
725 | drv_data->rx = transfer->rx_buf; | |
726 | drv_data->rx_end = drv_data->rx + transfer->len; | |
88b40369 BW |
727 | dev_dbg(&drv_data->pdev->dev, "rx_buf is %p, rx_end is %p\n", |
728 | transfer->rx_buf, drv_data->rx_end); | |
a5f6abd4 WB |
729 | } else { |
730 | drv_data->rx = NULL; | |
731 | } | |
732 | ||
733 | drv_data->rx_dma = transfer->rx_dma; | |
734 | drv_data->tx_dma = transfer->tx_dma; | |
735 | drv_data->len_in_bytes = transfer->len; | |
fad91c89 | 736 | drv_data->cs_change = transfer->cs_change; |
a5f6abd4 | 737 | |
092e1fda BW |
738 | /* Bits per word setup */ |
739 | switch (transfer->bits_per_word) { | |
740 | case 8: | |
741 | drv_data->n_bytes = 1; | |
742 | width = CFG_SPI_WORDSIZE8; | |
743 | drv_data->read = chip->cs_change_per_word ? | |
744 | u8_cs_chg_reader : u8_reader; | |
745 | drv_data->write = chip->cs_change_per_word ? | |
746 | u8_cs_chg_writer : u8_writer; | |
747 | drv_data->duplex = chip->cs_change_per_word ? | |
748 | u8_cs_chg_duplex : u8_duplex; | |
749 | break; | |
750 | ||
751 | case 16: | |
752 | drv_data->n_bytes = 2; | |
753 | width = CFG_SPI_WORDSIZE16; | |
754 | drv_data->read = chip->cs_change_per_word ? | |
755 | u16_cs_chg_reader : u16_reader; | |
756 | drv_data->write = chip->cs_change_per_word ? | |
757 | u16_cs_chg_writer : u16_writer; | |
758 | drv_data->duplex = chip->cs_change_per_word ? | |
759 | u16_cs_chg_duplex : u16_duplex; | |
760 | break; | |
761 | ||
762 | default: | |
763 | /* No change, the same as default setting */ | |
764 | drv_data->n_bytes = chip->n_bytes; | |
765 | width = chip->width; | |
766 | drv_data->write = drv_data->tx ? chip->write : null_writer; | |
767 | drv_data->read = drv_data->rx ? chip->read : null_reader; | |
768 | drv_data->duplex = chip->duplex ? chip->duplex : null_writer; | |
769 | break; | |
770 | } | |
771 | cr = (read_CTRL(drv_data) & (~BIT_CTL_TIMOD)); | |
772 | cr |= (width << 8); | |
773 | write_CTRL(drv_data, cr); | |
774 | ||
a5f6abd4 WB |
775 | if (width == CFG_SPI_WORDSIZE16) { |
776 | drv_data->len = (transfer->len) >> 1; | |
777 | } else { | |
778 | drv_data->len = transfer->len; | |
779 | } | |
131b17d4 BW |
780 | dev_dbg(&drv_data->pdev->dev, "transfer: ", |
781 | "drv_data->write is %p, chip->write is %p, null_wr is %p\n", | |
782 | drv_data->write, chip->write, null_writer); | |
a5f6abd4 WB |
783 | |
784 | /* speed and width has been set on per message */ | |
785 | message->state = RUNNING_STATE; | |
786 | dma_config = 0; | |
787 | ||
092e1fda BW |
788 | /* Speed setup (surely valid because already checked) */ |
789 | if (transfer->speed_hz) | |
790 | write_BAUD(drv_data, hz_to_spi_baud(transfer->speed_hz)); | |
791 | else | |
792 | write_BAUD(drv_data, chip->baud); | |
793 | ||
bb90eb00 BW |
794 | write_STAT(drv_data, BIT_STAT_CLR); |
795 | cr = (read_CTRL(drv_data) & (~BIT_CTL_TIMOD)); | |
796 | cs_active(drv_data, chip); | |
a5f6abd4 | 797 | |
88b40369 BW |
798 | dev_dbg(&drv_data->pdev->dev, |
799 | "now pumping a transfer: width is %d, len is %d\n", | |
800 | width, transfer->len); | |
a5f6abd4 WB |
801 | |
802 | /* | |
803 | * Try to map dma buffer and do a dma transfer if | |
804 | * successful use different way to r/w according to | |
805 | * drv_data->cur_chip->enable_dma | |
806 | */ | |
807 | if (drv_data->cur_chip->enable_dma && drv_data->len > 6) { | |
808 | ||
bb90eb00 BW |
809 | disable_dma(drv_data->dma_channel); |
810 | clear_dma_irqstat(drv_data->dma_channel); | |
07612e5f | 811 | bfin_spi_disable(drv_data); |
a5f6abd4 WB |
812 | |
813 | /* config dma channel */ | |
88b40369 | 814 | dev_dbg(&drv_data->pdev->dev, "doing dma transfer\n"); |
a5f6abd4 | 815 | if (width == CFG_SPI_WORDSIZE16) { |
bb90eb00 BW |
816 | set_dma_x_count(drv_data->dma_channel, drv_data->len); |
817 | set_dma_x_modify(drv_data->dma_channel, 2); | |
a5f6abd4 WB |
818 | dma_width = WDSIZE_16; |
819 | } else { | |
bb90eb00 BW |
820 | set_dma_x_count(drv_data->dma_channel, drv_data->len); |
821 | set_dma_x_modify(drv_data->dma_channel, 1); | |
a5f6abd4 WB |
822 | dma_width = WDSIZE_8; |
823 | } | |
824 | ||
3f479a65 | 825 | /* poll for SPI completion before start */ |
bb90eb00 | 826 | while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) |
d8c05008 | 827 | cpu_relax(); |
3f479a65 | 828 | |
a5f6abd4 WB |
829 | /* dirty hack for autobuffer DMA mode */ |
830 | if (drv_data->tx_dma == 0xFFFF) { | |
88b40369 BW |
831 | dev_dbg(&drv_data->pdev->dev, |
832 | "doing autobuffer DMA out.\n"); | |
a5f6abd4 WB |
833 | |
834 | /* no irq in autobuffer mode */ | |
835 | dma_config = | |
836 | (DMAFLOW_AUTO | RESTART | dma_width | DI_EN); | |
bb90eb00 BW |
837 | set_dma_config(drv_data->dma_channel, dma_config); |
838 | set_dma_start_addr(drv_data->dma_channel, | |
a32c691d | 839 | (unsigned long)drv_data->tx); |
bb90eb00 | 840 | enable_dma(drv_data->dma_channel); |
a5f6abd4 | 841 | |
07612e5f SZ |
842 | /* start SPI transfer */ |
843 | write_CTRL(drv_data, | |
844 | (cr | CFG_SPI_DMAWRITE | BIT_CTL_ENABLE)); | |
845 | ||
846 | /* just return here, there can only be one transfer | |
847 | * in this mode | |
848 | */ | |
a5f6abd4 WB |
849 | message->status = 0; |
850 | giveback(drv_data); | |
851 | return; | |
852 | } | |
853 | ||
854 | /* In dma mode, rx or tx must be NULL in one transfer */ | |
855 | if (drv_data->rx != NULL) { | |
856 | /* set transfer mode, and enable SPI */ | |
88b40369 | 857 | dev_dbg(&drv_data->pdev->dev, "doing DMA in.\n"); |
a5f6abd4 | 858 | |
a5f6abd4 | 859 | /* clear tx reg soformer data is not shifted out */ |
bb90eb00 | 860 | write_TDBR(drv_data, 0xFFFF); |
a5f6abd4 | 861 | |
bb90eb00 | 862 | set_dma_x_count(drv_data->dma_channel, drv_data->len); |
a5f6abd4 WB |
863 | |
864 | /* start dma */ | |
bb90eb00 | 865 | dma_enable_irq(drv_data->dma_channel); |
a5f6abd4 | 866 | dma_config = (WNR | RESTART | dma_width | DI_EN); |
bb90eb00 BW |
867 | set_dma_config(drv_data->dma_channel, dma_config); |
868 | set_dma_start_addr(drv_data->dma_channel, | |
a32c691d | 869 | (unsigned long)drv_data->rx); |
bb90eb00 | 870 | enable_dma(drv_data->dma_channel); |
a5f6abd4 | 871 | |
07612e5f SZ |
872 | /* start SPI transfer */ |
873 | write_CTRL(drv_data, | |
874 | (cr | CFG_SPI_DMAREAD | BIT_CTL_ENABLE)); | |
875 | ||
a5f6abd4 | 876 | } else if (drv_data->tx != NULL) { |
88b40369 | 877 | dev_dbg(&drv_data->pdev->dev, "doing DMA out.\n"); |
a5f6abd4 WB |
878 | |
879 | /* start dma */ | |
bb90eb00 | 880 | dma_enable_irq(drv_data->dma_channel); |
a5f6abd4 | 881 | dma_config = (RESTART | dma_width | DI_EN); |
bb90eb00 BW |
882 | set_dma_config(drv_data->dma_channel, dma_config); |
883 | set_dma_start_addr(drv_data->dma_channel, | |
a32c691d | 884 | (unsigned long)drv_data->tx); |
bb90eb00 | 885 | enable_dma(drv_data->dma_channel); |
07612e5f SZ |
886 | |
887 | /* start SPI transfer */ | |
888 | write_CTRL(drv_data, | |
889 | (cr | CFG_SPI_DMAWRITE | BIT_CTL_ENABLE)); | |
a5f6abd4 WB |
890 | } |
891 | } else { | |
892 | /* IO mode write then read */ | |
88b40369 | 893 | dev_dbg(&drv_data->pdev->dev, "doing IO transfer\n"); |
a5f6abd4 | 894 | |
a5f6abd4 WB |
895 | if (drv_data->tx != NULL && drv_data->rx != NULL) { |
896 | /* full duplex mode */ | |
897 | BUG_ON((drv_data->tx_end - drv_data->tx) != | |
898 | (drv_data->rx_end - drv_data->rx)); | |
88b40369 BW |
899 | dev_dbg(&drv_data->pdev->dev, |
900 | "IO duplex: cr is 0x%x\n", cr); | |
a5f6abd4 | 901 | |
cc487e73 | 902 | /* set SPI transfer mode */ |
bb90eb00 | 903 | write_CTRL(drv_data, (cr | CFG_SPI_WRITE)); |
a5f6abd4 WB |
904 | |
905 | drv_data->duplex(drv_data); | |
906 | ||
907 | if (drv_data->tx != drv_data->tx_end) | |
908 | tranf_success = 0; | |
909 | } else if (drv_data->tx != NULL) { | |
910 | /* write only half duplex */ | |
131b17d4 | 911 | dev_dbg(&drv_data->pdev->dev, |
88b40369 | 912 | "IO write: cr is 0x%x\n", cr); |
a5f6abd4 | 913 | |
cc487e73 | 914 | /* set SPI transfer mode */ |
bb90eb00 | 915 | write_CTRL(drv_data, (cr | CFG_SPI_WRITE)); |
a5f6abd4 WB |
916 | |
917 | drv_data->write(drv_data); | |
918 | ||
919 | if (drv_data->tx != drv_data->tx_end) | |
920 | tranf_success = 0; | |
921 | } else if (drv_data->rx != NULL) { | |
922 | /* read only half duplex */ | |
131b17d4 | 923 | dev_dbg(&drv_data->pdev->dev, |
88b40369 | 924 | "IO read: cr is 0x%x\n", cr); |
a5f6abd4 | 925 | |
cc487e73 | 926 | /* set SPI transfer mode */ |
bb90eb00 | 927 | write_CTRL(drv_data, (cr | CFG_SPI_READ)); |
a5f6abd4 WB |
928 | |
929 | drv_data->read(drv_data); | |
930 | if (drv_data->rx != drv_data->rx_end) | |
931 | tranf_success = 0; | |
932 | } | |
933 | ||
934 | if (!tranf_success) { | |
131b17d4 | 935 | dev_dbg(&drv_data->pdev->dev, |
88b40369 | 936 | "IO write error!\n"); |
a5f6abd4 WB |
937 | message->state = ERROR_STATE; |
938 | } else { | |
939 | /* Update total byte transfered */ | |
940 | message->actual_length += drv_data->len; | |
941 | ||
942 | /* Move to next transfer of this msg */ | |
943 | message->state = next_transfer(drv_data); | |
944 | } | |
945 | ||
946 | /* Schedule next transfer tasklet */ | |
947 | tasklet_schedule(&drv_data->pump_transfers); | |
948 | ||
949 | } | |
950 | } | |
951 | ||
952 | /* pop a msg from queue and kick off real transfer */ | |
953 | static void pump_messages(struct work_struct *work) | |
954 | { | |
131b17d4 | 955 | struct driver_data *drv_data; |
a5f6abd4 WB |
956 | unsigned long flags; |
957 | ||
131b17d4 BW |
958 | drv_data = container_of(work, struct driver_data, pump_messages); |
959 | ||
a5f6abd4 WB |
960 | /* Lock queue and check for queue work */ |
961 | spin_lock_irqsave(&drv_data->lock, flags); | |
962 | if (list_empty(&drv_data->queue) || drv_data->run == QUEUE_STOPPED) { | |
963 | /* pumper kicked off but no work to do */ | |
964 | drv_data->busy = 0; | |
965 | spin_unlock_irqrestore(&drv_data->lock, flags); | |
966 | return; | |
967 | } | |
968 | ||
969 | /* Make sure we are not already running a message */ | |
970 | if (drv_data->cur_msg) { | |
971 | spin_unlock_irqrestore(&drv_data->lock, flags); | |
972 | return; | |
973 | } | |
974 | ||
975 | /* Extract head of queue */ | |
976 | drv_data->cur_msg = list_entry(drv_data->queue.next, | |
977 | struct spi_message, queue); | |
5fec5b5a BW |
978 | |
979 | /* Setup the SSP using the per chip configuration */ | |
980 | drv_data->cur_chip = spi_get_ctldata(drv_data->cur_msg->spi); | |
981 | if (restore_state(drv_data)) { | |
982 | spin_unlock_irqrestore(&drv_data->lock, flags); | |
983 | return; | |
984 | }; | |
985 | ||
a5f6abd4 WB |
986 | list_del_init(&drv_data->cur_msg->queue); |
987 | ||
988 | /* Initial message state */ | |
989 | drv_data->cur_msg->state = START_STATE; | |
990 | drv_data->cur_transfer = list_entry(drv_data->cur_msg->transfers.next, | |
991 | struct spi_transfer, transfer_list); | |
992 | ||
5fec5b5a BW |
993 | dev_dbg(&drv_data->pdev->dev, "got a message to pump, " |
994 | "state is set to: baud %d, flag 0x%x, ctl 0x%x\n", | |
995 | drv_data->cur_chip->baud, drv_data->cur_chip->flag, | |
996 | drv_data->cur_chip->ctl_reg); | |
131b17d4 BW |
997 | |
998 | dev_dbg(&drv_data->pdev->dev, | |
88b40369 BW |
999 | "the first transfer len is %d\n", |
1000 | drv_data->cur_transfer->len); | |
a5f6abd4 WB |
1001 | |
1002 | /* Mark as busy and launch transfers */ | |
1003 | tasklet_schedule(&drv_data->pump_transfers); | |
1004 | ||
1005 | drv_data->busy = 1; | |
1006 | spin_unlock_irqrestore(&drv_data->lock, flags); | |
1007 | } | |
1008 | ||
1009 | /* | |
1010 | * got a msg to transfer, queue it in drv_data->queue. | |
1011 | * And kick off message pumper | |
1012 | */ | |
1013 | static int transfer(struct spi_device *spi, struct spi_message *msg) | |
1014 | { | |
1015 | struct driver_data *drv_data = spi_master_get_devdata(spi->master); | |
1016 | unsigned long flags; | |
1017 | ||
1018 | spin_lock_irqsave(&drv_data->lock, flags); | |
1019 | ||
1020 | if (drv_data->run == QUEUE_STOPPED) { | |
1021 | spin_unlock_irqrestore(&drv_data->lock, flags); | |
1022 | return -ESHUTDOWN; | |
1023 | } | |
1024 | ||
1025 | msg->actual_length = 0; | |
1026 | msg->status = -EINPROGRESS; | |
1027 | msg->state = START_STATE; | |
1028 | ||
88b40369 | 1029 | dev_dbg(&spi->dev, "adding an msg in transfer() \n"); |
a5f6abd4 WB |
1030 | list_add_tail(&msg->queue, &drv_data->queue); |
1031 | ||
1032 | if (drv_data->run == QUEUE_RUNNING && !drv_data->busy) | |
1033 | queue_work(drv_data->workqueue, &drv_data->pump_messages); | |
1034 | ||
1035 | spin_unlock_irqrestore(&drv_data->lock, flags); | |
1036 | ||
1037 | return 0; | |
1038 | } | |
1039 | ||
12e17c42 SZ |
1040 | #define MAX_SPI_SSEL 7 |
1041 | ||
1042 | static u16 ssel[3][MAX_SPI_SSEL] = { | |
1043 | {P_SPI0_SSEL1, P_SPI0_SSEL2, P_SPI0_SSEL3, | |
1044 | P_SPI0_SSEL4, P_SPI0_SSEL5, | |
1045 | P_SPI0_SSEL6, P_SPI0_SSEL7}, | |
1046 | ||
1047 | {P_SPI1_SSEL1, P_SPI1_SSEL2, P_SPI1_SSEL3, | |
1048 | P_SPI1_SSEL4, P_SPI1_SSEL5, | |
1049 | P_SPI1_SSEL6, P_SPI1_SSEL7}, | |
1050 | ||
1051 | {P_SPI2_SSEL1, P_SPI2_SSEL2, P_SPI2_SSEL3, | |
1052 | P_SPI2_SSEL4, P_SPI2_SSEL5, | |
1053 | P_SPI2_SSEL6, P_SPI2_SSEL7}, | |
1054 | }; | |
1055 | ||
a5f6abd4 WB |
1056 | /* first setup for new devices */ |
1057 | static int setup(struct spi_device *spi) | |
1058 | { | |
1059 | struct bfin5xx_spi_chip *chip_info = NULL; | |
1060 | struct chip_data *chip; | |
1061 | struct driver_data *drv_data = spi_master_get_devdata(spi->master); | |
1062 | u8 spi_flg; | |
1063 | ||
1064 | /* Abort device setup if requested features are not supported */ | |
1065 | if (spi->mode & ~(SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST)) { | |
1066 | dev_err(&spi->dev, "requested mode not fully supported\n"); | |
1067 | return -EINVAL; | |
1068 | } | |
1069 | ||
1070 | /* Zero (the default) here means 8 bits */ | |
1071 | if (!spi->bits_per_word) | |
1072 | spi->bits_per_word = 8; | |
1073 | ||
1074 | if (spi->bits_per_word != 8 && spi->bits_per_word != 16) | |
1075 | return -EINVAL; | |
1076 | ||
1077 | /* Only alloc (or use chip_info) on first setup */ | |
1078 | chip = spi_get_ctldata(spi); | |
1079 | if (chip == NULL) { | |
1080 | chip = kzalloc(sizeof(struct chip_data), GFP_KERNEL); | |
1081 | if (!chip) | |
1082 | return -ENOMEM; | |
1083 | ||
1084 | chip->enable_dma = 0; | |
1085 | chip_info = spi->controller_data; | |
1086 | } | |
1087 | ||
1088 | /* chip_info isn't always needed */ | |
1089 | if (chip_info) { | |
2ed35516 MF |
1090 | /* Make sure people stop trying to set fields via ctl_reg |
1091 | * when they should actually be using common SPI framework. | |
1092 | * Currently we let through: WOM EMISO PSSE GM SZ TIMOD. | |
1093 | * Not sure if a user actually needs/uses any of these, | |
1094 | * but let's assume (for now) they do. | |
1095 | */ | |
1096 | if (chip_info->ctl_reg & (SPE|MSTR|CPOL|CPHA|LSBF|SIZE)) { | |
1097 | dev_err(&spi->dev, "do not set bits in ctl_reg " | |
1098 | "that the SPI framework manages\n"); | |
1099 | return -EINVAL; | |
1100 | } | |
1101 | ||
a5f6abd4 WB |
1102 | chip->enable_dma = chip_info->enable_dma != 0 |
1103 | && drv_data->master_info->enable_dma; | |
1104 | chip->ctl_reg = chip_info->ctl_reg; | |
1105 | chip->bits_per_word = chip_info->bits_per_word; | |
1106 | chip->cs_change_per_word = chip_info->cs_change_per_word; | |
1107 | chip->cs_chg_udelay = chip_info->cs_chg_udelay; | |
1108 | } | |
1109 | ||
1110 | /* translate common spi framework into our register */ | |
1111 | if (spi->mode & SPI_CPOL) | |
1112 | chip->ctl_reg |= CPOL; | |
1113 | if (spi->mode & SPI_CPHA) | |
1114 | chip->ctl_reg |= CPHA; | |
1115 | if (spi->mode & SPI_LSB_FIRST) | |
1116 | chip->ctl_reg |= LSBF; | |
1117 | /* we dont support running in slave mode (yet?) */ | |
1118 | chip->ctl_reg |= MSTR; | |
1119 | ||
1120 | /* | |
1121 | * if any one SPI chip is registered and wants DMA, request the | |
1122 | * DMA channel for it | |
1123 | */ | |
bb90eb00 | 1124 | if (chip->enable_dma && !drv_data->dma_requested) { |
a5f6abd4 | 1125 | /* register dma irq handler */ |
bb90eb00 | 1126 | if (request_dma(drv_data->dma_channel, "BF53x_SPI_DMA") < 0) { |
88b40369 BW |
1127 | dev_dbg(&spi->dev, |
1128 | "Unable to request BlackFin SPI DMA channel\n"); | |
a5f6abd4 WB |
1129 | return -ENODEV; |
1130 | } | |
bb90eb00 BW |
1131 | if (set_dma_callback(drv_data->dma_channel, |
1132 | (void *)dma_irq_handler, drv_data) < 0) { | |
88b40369 | 1133 | dev_dbg(&spi->dev, "Unable to set dma callback\n"); |
a5f6abd4 WB |
1134 | return -EPERM; |
1135 | } | |
bb90eb00 BW |
1136 | dma_disable_irq(drv_data->dma_channel); |
1137 | drv_data->dma_requested = 1; | |
a5f6abd4 WB |
1138 | } |
1139 | ||
1140 | /* | |
1141 | * Notice: for blackfin, the speed_hz is the value of register | |
1142 | * SPI_BAUD, not the real baudrate | |
1143 | */ | |
1144 | chip->baud = hz_to_spi_baud(spi->max_speed_hz); | |
1145 | spi_flg = ~(1 << (spi->chip_select)); | |
1146 | chip->flag = ((u16) spi_flg << 8) | (1 << (spi->chip_select)); | |
1147 | chip->chip_select_num = spi->chip_select; | |
1148 | ||
1149 | switch (chip->bits_per_word) { | |
1150 | case 8: | |
1151 | chip->n_bytes = 1; | |
1152 | chip->width = CFG_SPI_WORDSIZE8; | |
1153 | chip->read = chip->cs_change_per_word ? | |
1154 | u8_cs_chg_reader : u8_reader; | |
1155 | chip->write = chip->cs_change_per_word ? | |
1156 | u8_cs_chg_writer : u8_writer; | |
1157 | chip->duplex = chip->cs_change_per_word ? | |
1158 | u8_cs_chg_duplex : u8_duplex; | |
1159 | break; | |
1160 | ||
1161 | case 16: | |
1162 | chip->n_bytes = 2; | |
1163 | chip->width = CFG_SPI_WORDSIZE16; | |
1164 | chip->read = chip->cs_change_per_word ? | |
1165 | u16_cs_chg_reader : u16_reader; | |
1166 | chip->write = chip->cs_change_per_word ? | |
1167 | u16_cs_chg_writer : u16_writer; | |
1168 | chip->duplex = chip->cs_change_per_word ? | |
1169 | u16_cs_chg_duplex : u16_duplex; | |
1170 | break; | |
1171 | ||
1172 | default: | |
1173 | dev_err(&spi->dev, "%d bits_per_word is not supported\n", | |
1174 | chip->bits_per_word); | |
1175 | kfree(chip); | |
1176 | return -ENODEV; | |
1177 | } | |
1178 | ||
898eb71c | 1179 | dev_dbg(&spi->dev, "setup spi chip %s, width is %d, dma is %d\n", |
a5f6abd4 | 1180 | spi->modalias, chip->width, chip->enable_dma); |
88b40369 | 1181 | dev_dbg(&spi->dev, "ctl_reg is 0x%x, flag_reg is 0x%x\n", |
a5f6abd4 WB |
1182 | chip->ctl_reg, chip->flag); |
1183 | ||
1184 | spi_set_ctldata(spi, chip); | |
1185 | ||
12e17c42 SZ |
1186 | dev_dbg(&spi->dev, "chip select number is %d\n", chip->chip_select_num); |
1187 | if ((chip->chip_select_num > 0) | |
1188 | && (chip->chip_select_num <= spi->master->num_chipselect)) | |
1189 | peripheral_request(ssel[spi->master->bus_num] | |
1190 | [chip->chip_select_num-1], DRV_NAME); | |
1191 | ||
07612e5f SZ |
1192 | cs_deactive(drv_data, chip); |
1193 | ||
a5f6abd4 WB |
1194 | return 0; |
1195 | } | |
1196 | ||
1197 | /* | |
1198 | * callback for spi framework. | |
1199 | * clean driver specific data | |
1200 | */ | |
88b40369 | 1201 | static void cleanup(struct spi_device *spi) |
a5f6abd4 | 1202 | { |
27bb9e79 | 1203 | struct chip_data *chip = spi_get_ctldata(spi); |
a5f6abd4 | 1204 | |
12e17c42 SZ |
1205 | if ((chip->chip_select_num > 0) |
1206 | && (chip->chip_select_num <= spi->master->num_chipselect)) | |
1207 | peripheral_free(ssel[spi->master->bus_num] | |
1208 | [chip->chip_select_num-1]); | |
1209 | ||
a5f6abd4 WB |
1210 | kfree(chip); |
1211 | } | |
1212 | ||
1213 | static inline int init_queue(struct driver_data *drv_data) | |
1214 | { | |
1215 | INIT_LIST_HEAD(&drv_data->queue); | |
1216 | spin_lock_init(&drv_data->lock); | |
1217 | ||
1218 | drv_data->run = QUEUE_STOPPED; | |
1219 | drv_data->busy = 0; | |
1220 | ||
1221 | /* init transfer tasklet */ | |
1222 | tasklet_init(&drv_data->pump_transfers, | |
1223 | pump_transfers, (unsigned long)drv_data); | |
1224 | ||
1225 | /* init messages workqueue */ | |
1226 | INIT_WORK(&drv_data->pump_messages, pump_messages); | |
1227 | drv_data->workqueue = | |
49dce689 | 1228 | create_singlethread_workqueue(drv_data->master->dev.parent->bus_id); |
a5f6abd4 WB |
1229 | if (drv_data->workqueue == NULL) |
1230 | return -EBUSY; | |
1231 | ||
1232 | return 0; | |
1233 | } | |
1234 | ||
1235 | static inline int start_queue(struct driver_data *drv_data) | |
1236 | { | |
1237 | unsigned long flags; | |
1238 | ||
1239 | spin_lock_irqsave(&drv_data->lock, flags); | |
1240 | ||
1241 | if (drv_data->run == QUEUE_RUNNING || drv_data->busy) { | |
1242 | spin_unlock_irqrestore(&drv_data->lock, flags); | |
1243 | return -EBUSY; | |
1244 | } | |
1245 | ||
1246 | drv_data->run = QUEUE_RUNNING; | |
1247 | drv_data->cur_msg = NULL; | |
1248 | drv_data->cur_transfer = NULL; | |
1249 | drv_data->cur_chip = NULL; | |
1250 | spin_unlock_irqrestore(&drv_data->lock, flags); | |
1251 | ||
1252 | queue_work(drv_data->workqueue, &drv_data->pump_messages); | |
1253 | ||
1254 | return 0; | |
1255 | } | |
1256 | ||
1257 | static inline int stop_queue(struct driver_data *drv_data) | |
1258 | { | |
1259 | unsigned long flags; | |
1260 | unsigned limit = 500; | |
1261 | int status = 0; | |
1262 | ||
1263 | spin_lock_irqsave(&drv_data->lock, flags); | |
1264 | ||
1265 | /* | |
1266 | * This is a bit lame, but is optimized for the common execution path. | |
1267 | * A wait_queue on the drv_data->busy could be used, but then the common | |
1268 | * execution path (pump_messages) would be required to call wake_up or | |
1269 | * friends on every SPI message. Do this instead | |
1270 | */ | |
1271 | drv_data->run = QUEUE_STOPPED; | |
1272 | while (!list_empty(&drv_data->queue) && drv_data->busy && limit--) { | |
1273 | spin_unlock_irqrestore(&drv_data->lock, flags); | |
1274 | msleep(10); | |
1275 | spin_lock_irqsave(&drv_data->lock, flags); | |
1276 | } | |
1277 | ||
1278 | if (!list_empty(&drv_data->queue) || drv_data->busy) | |
1279 | status = -EBUSY; | |
1280 | ||
1281 | spin_unlock_irqrestore(&drv_data->lock, flags); | |
1282 | ||
1283 | return status; | |
1284 | } | |
1285 | ||
1286 | static inline int destroy_queue(struct driver_data *drv_data) | |
1287 | { | |
1288 | int status; | |
1289 | ||
1290 | status = stop_queue(drv_data); | |
1291 | if (status != 0) | |
1292 | return status; | |
1293 | ||
1294 | destroy_workqueue(drv_data->workqueue); | |
1295 | ||
1296 | return 0; | |
1297 | } | |
1298 | ||
1299 | static int __init bfin5xx_spi_probe(struct platform_device *pdev) | |
1300 | { | |
1301 | struct device *dev = &pdev->dev; | |
1302 | struct bfin5xx_spi_master *platform_info; | |
1303 | struct spi_master *master; | |
1304 | struct driver_data *drv_data = 0; | |
a32c691d | 1305 | struct resource *res; |
a5f6abd4 WB |
1306 | int status = 0; |
1307 | ||
1308 | platform_info = dev->platform_data; | |
1309 | ||
1310 | /* Allocate master with space for drv_data */ | |
1311 | master = spi_alloc_master(dev, sizeof(struct driver_data) + 16); | |
1312 | if (!master) { | |
1313 | dev_err(&pdev->dev, "can not alloc spi_master\n"); | |
1314 | return -ENOMEM; | |
1315 | } | |
131b17d4 | 1316 | |
a5f6abd4 WB |
1317 | drv_data = spi_master_get_devdata(master); |
1318 | drv_data->master = master; | |
1319 | drv_data->master_info = platform_info; | |
1320 | drv_data->pdev = pdev; | |
003d9226 | 1321 | drv_data->pin_req = platform_info->pin_req; |
a5f6abd4 WB |
1322 | |
1323 | master->bus_num = pdev->id; | |
1324 | master->num_chipselect = platform_info->num_chipselect; | |
1325 | master->cleanup = cleanup; | |
1326 | master->setup = setup; | |
1327 | master->transfer = transfer; | |
1328 | ||
a32c691d BW |
1329 | /* Find and map our resources */ |
1330 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
1331 | if (res == NULL) { | |
1332 | dev_err(dev, "Cannot get IORESOURCE_MEM\n"); | |
1333 | status = -ENOENT; | |
1334 | goto out_error_get_res; | |
1335 | } | |
1336 | ||
f452126c BW |
1337 | drv_data->regs_base = ioremap(res->start, (res->end - res->start + 1)); |
1338 | if (drv_data->regs_base == NULL) { | |
a32c691d BW |
1339 | dev_err(dev, "Cannot map IO\n"); |
1340 | status = -ENXIO; | |
1341 | goto out_error_ioremap; | |
1342 | } | |
1343 | ||
bb90eb00 BW |
1344 | drv_data->dma_channel = platform_get_irq(pdev, 0); |
1345 | if (drv_data->dma_channel < 0) { | |
a32c691d BW |
1346 | dev_err(dev, "No DMA channel specified\n"); |
1347 | status = -ENOENT; | |
1348 | goto out_error_no_dma_ch; | |
1349 | } | |
1350 | ||
a5f6abd4 WB |
1351 | /* Initial and start queue */ |
1352 | status = init_queue(drv_data); | |
1353 | if (status != 0) { | |
a32c691d | 1354 | dev_err(dev, "problem initializing queue\n"); |
a5f6abd4 WB |
1355 | goto out_error_queue_alloc; |
1356 | } | |
a32c691d | 1357 | |
a5f6abd4 WB |
1358 | status = start_queue(drv_data); |
1359 | if (status != 0) { | |
a32c691d | 1360 | dev_err(dev, "problem starting queue\n"); |
a5f6abd4 WB |
1361 | goto out_error_queue_alloc; |
1362 | } | |
1363 | ||
1364 | /* Register with the SPI framework */ | |
1365 | platform_set_drvdata(pdev, drv_data); | |
1366 | status = spi_register_master(master); | |
1367 | if (status != 0) { | |
a32c691d | 1368 | dev_err(dev, "problem registering spi master\n"); |
a5f6abd4 WB |
1369 | goto out_error_queue_alloc; |
1370 | } | |
a32c691d | 1371 | |
003d9226 BW |
1372 | status = peripheral_request_list(drv_data->pin_req, DRV_NAME); |
1373 | if (status != 0) { | |
7c4ef094 SZ |
1374 | dev_err(&pdev->dev, ": Requesting Peripherals failed\n"); |
1375 | goto out_error; | |
1376 | } | |
1377 | ||
f452126c | 1378 | dev_info(dev, "%s, Version %s, regs_base@%p, dma channel@%d\n", |
bb90eb00 BW |
1379 | DRV_DESC, DRV_VERSION, drv_data->regs_base, |
1380 | drv_data->dma_channel); | |
a5f6abd4 WB |
1381 | return status; |
1382 | ||
cc2f81a6 | 1383 | out_error_queue_alloc: |
a5f6abd4 | 1384 | destroy_queue(drv_data); |
a32c691d | 1385 | out_error_no_dma_ch: |
bb90eb00 | 1386 | iounmap((void *) drv_data->regs_base); |
a32c691d BW |
1387 | out_error_ioremap: |
1388 | out_error_get_res: | |
cc2f81a6 | 1389 | out_error: |
a5f6abd4 | 1390 | spi_master_put(master); |
cc2f81a6 | 1391 | |
a5f6abd4 WB |
1392 | return status; |
1393 | } | |
1394 | ||
1395 | /* stop hardware and remove the driver */ | |
1396 | static int __devexit bfin5xx_spi_remove(struct platform_device *pdev) | |
1397 | { | |
1398 | struct driver_data *drv_data = platform_get_drvdata(pdev); | |
1399 | int status = 0; | |
1400 | ||
1401 | if (!drv_data) | |
1402 | return 0; | |
1403 | ||
1404 | /* Remove the queue */ | |
1405 | status = destroy_queue(drv_data); | |
1406 | if (status != 0) | |
1407 | return status; | |
1408 | ||
1409 | /* Disable the SSP at the peripheral and SOC level */ | |
1410 | bfin_spi_disable(drv_data); | |
1411 | ||
1412 | /* Release DMA */ | |
1413 | if (drv_data->master_info->enable_dma) { | |
bb90eb00 BW |
1414 | if (dma_channel_active(drv_data->dma_channel)) |
1415 | free_dma(drv_data->dma_channel); | |
a5f6abd4 WB |
1416 | } |
1417 | ||
1418 | /* Disconnect from the SPI framework */ | |
1419 | spi_unregister_master(drv_data->master); | |
1420 | ||
003d9226 | 1421 | peripheral_free_list(drv_data->pin_req); |
cc2f81a6 | 1422 | |
a5f6abd4 WB |
1423 | /* Prevent double remove */ |
1424 | platform_set_drvdata(pdev, NULL); | |
1425 | ||
1426 | return 0; | |
1427 | } | |
1428 | ||
1429 | #ifdef CONFIG_PM | |
1430 | static int bfin5xx_spi_suspend(struct platform_device *pdev, pm_message_t state) | |
1431 | { | |
1432 | struct driver_data *drv_data = platform_get_drvdata(pdev); | |
1433 | int status = 0; | |
1434 | ||
1435 | status = stop_queue(drv_data); | |
1436 | if (status != 0) | |
1437 | return status; | |
1438 | ||
1439 | /* stop hardware */ | |
1440 | bfin_spi_disable(drv_data); | |
1441 | ||
1442 | return 0; | |
1443 | } | |
1444 | ||
1445 | static int bfin5xx_spi_resume(struct platform_device *pdev) | |
1446 | { | |
1447 | struct driver_data *drv_data = platform_get_drvdata(pdev); | |
1448 | int status = 0; | |
1449 | ||
1450 | /* Enable the SPI interface */ | |
1451 | bfin_spi_enable(drv_data); | |
1452 | ||
1453 | /* Start the queue running */ | |
1454 | status = start_queue(drv_data); | |
1455 | if (status != 0) { | |
1456 | dev_err(&pdev->dev, "problem starting queue (%d)\n", status); | |
1457 | return status; | |
1458 | } | |
1459 | ||
1460 | return 0; | |
1461 | } | |
1462 | #else | |
1463 | #define bfin5xx_spi_suspend NULL | |
1464 | #define bfin5xx_spi_resume NULL | |
1465 | #endif /* CONFIG_PM */ | |
1466 | ||
fc3ba952 | 1467 | MODULE_ALIAS("bfin-spi-master"); /* for platform bus hotplug */ |
a5f6abd4 | 1468 | static struct platform_driver bfin5xx_spi_driver = { |
fc3ba952 | 1469 | .driver = { |
a32c691d | 1470 | .name = DRV_NAME, |
88b40369 BW |
1471 | .owner = THIS_MODULE, |
1472 | }, | |
1473 | .suspend = bfin5xx_spi_suspend, | |
1474 | .resume = bfin5xx_spi_resume, | |
1475 | .remove = __devexit_p(bfin5xx_spi_remove), | |
a5f6abd4 WB |
1476 | }; |
1477 | ||
1478 | static int __init bfin5xx_spi_init(void) | |
1479 | { | |
88b40369 | 1480 | return platform_driver_probe(&bfin5xx_spi_driver, bfin5xx_spi_probe); |
a5f6abd4 | 1481 | } |
a5f6abd4 WB |
1482 | module_init(bfin5xx_spi_init); |
1483 | ||
1484 | static void __exit bfin5xx_spi_exit(void) | |
1485 | { | |
1486 | platform_driver_unregister(&bfin5xx_spi_driver); | |
1487 | } | |
a5f6abd4 | 1488 | module_exit(bfin5xx_spi_exit); |