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d2aae47f SJ |
1 | /* |
2 | * bf6xx_sport.c Analog Devices BF6XX SPORT driver | |
3 | * | |
4 | * Copyright (c) 2012 Analog Devices Inc. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
18 | */ | |
19 | ||
20 | #include <linux/device.h> | |
21 | #include <linux/dma-mapping.h> | |
22 | #include <linux/interrupt.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/platform_device.h> | |
25 | #include <linux/slab.h> | |
26 | ||
27 | #include <asm/blackfin.h> | |
28 | #include <asm/dma.h> | |
29 | #include <asm/portmux.h> | |
30 | ||
31 | #include "bf6xx-sport.h" | |
32 | ||
33 | int sport_set_tx_params(struct sport_device *sport, | |
34 | struct sport_params *params) | |
35 | { | |
36 | if (sport->tx_regs->spctl & SPORT_CTL_SPENPRI) | |
37 | return -EBUSY; | |
38 | sport->tx_regs->spctl = params->spctl | SPORT_CTL_SPTRAN; | |
39 | sport->tx_regs->div = params->div; | |
40 | SSYNC(); | |
41 | return 0; | |
42 | } | |
43 | EXPORT_SYMBOL(sport_set_tx_params); | |
44 | ||
45 | int sport_set_rx_params(struct sport_device *sport, | |
46 | struct sport_params *params) | |
47 | { | |
48 | if (sport->rx_regs->spctl & SPORT_CTL_SPENPRI) | |
49 | return -EBUSY; | |
50 | sport->rx_regs->spctl = params->spctl & ~SPORT_CTL_SPTRAN; | |
51 | sport->rx_regs->div = params->div; | |
52 | SSYNC(); | |
53 | return 0; | |
54 | } | |
55 | EXPORT_SYMBOL(sport_set_rx_params); | |
56 | ||
57 | static int compute_wdsize(size_t wdsize) | |
58 | { | |
59 | switch (wdsize) { | |
60 | case 1: | |
61 | return WDSIZE_8 | PSIZE_8; | |
62 | case 2: | |
63 | return WDSIZE_16 | PSIZE_16; | |
64 | default: | |
65 | return WDSIZE_32 | PSIZE_32; | |
66 | } | |
67 | } | |
68 | ||
69 | void sport_tx_start(struct sport_device *sport) | |
70 | { | |
71 | set_dma_next_desc_addr(sport->tx_dma_chan, sport->tx_desc); | |
72 | set_dma_config(sport->tx_dma_chan, DMAFLOW_LIST | DI_EN | |
73 | | compute_wdsize(sport->wdsize) | NDSIZE_6); | |
74 | enable_dma(sport->tx_dma_chan); | |
75 | sport->tx_regs->spctl |= SPORT_CTL_SPENPRI; | |
76 | SSYNC(); | |
77 | } | |
78 | EXPORT_SYMBOL(sport_tx_start); | |
79 | ||
80 | void sport_rx_start(struct sport_device *sport) | |
81 | { | |
82 | set_dma_next_desc_addr(sport->rx_dma_chan, sport->rx_desc); | |
83 | set_dma_config(sport->rx_dma_chan, DMAFLOW_LIST | DI_EN | WNR | |
84 | | compute_wdsize(sport->wdsize) | NDSIZE_6); | |
85 | enable_dma(sport->rx_dma_chan); | |
86 | sport->rx_regs->spctl |= SPORT_CTL_SPENPRI; | |
87 | SSYNC(); | |
88 | } | |
89 | EXPORT_SYMBOL(sport_rx_start); | |
90 | ||
91 | void sport_tx_stop(struct sport_device *sport) | |
92 | { | |
93 | sport->tx_regs->spctl &= ~SPORT_CTL_SPENPRI; | |
94 | SSYNC(); | |
95 | disable_dma(sport->tx_dma_chan); | |
96 | } | |
97 | EXPORT_SYMBOL(sport_tx_stop); | |
98 | ||
99 | void sport_rx_stop(struct sport_device *sport) | |
100 | { | |
101 | sport->rx_regs->spctl &= ~SPORT_CTL_SPENPRI; | |
102 | SSYNC(); | |
103 | disable_dma(sport->rx_dma_chan); | |
104 | } | |
105 | EXPORT_SYMBOL(sport_rx_stop); | |
106 | ||
107 | void sport_set_tx_callback(struct sport_device *sport, | |
108 | void (*tx_callback)(void *), void *tx_data) | |
109 | { | |
110 | sport->tx_callback = tx_callback; | |
111 | sport->tx_data = tx_data; | |
112 | } | |
113 | EXPORT_SYMBOL(sport_set_tx_callback); | |
114 | ||
115 | void sport_set_rx_callback(struct sport_device *sport, | |
116 | void (*rx_callback)(void *), void *rx_data) | |
117 | { | |
118 | sport->rx_callback = rx_callback; | |
119 | sport->rx_data = rx_data; | |
120 | } | |
121 | EXPORT_SYMBOL(sport_set_rx_callback); | |
122 | ||
123 | static void setup_desc(struct dmasg *desc, void *buf, int fragcount, | |
124 | size_t fragsize, unsigned int cfg, | |
125 | unsigned int count, size_t wdsize) | |
126 | { | |
127 | ||
128 | int i; | |
129 | ||
130 | for (i = 0; i < fragcount; ++i) { | |
131 | desc[i].next_desc_addr = &(desc[i + 1]); | |
132 | desc[i].start_addr = (unsigned long)buf + i*fragsize; | |
133 | desc[i].cfg = cfg; | |
134 | desc[i].x_count = count; | |
135 | desc[i].x_modify = wdsize; | |
136 | desc[i].y_count = 0; | |
137 | desc[i].y_modify = 0; | |
138 | } | |
139 | ||
140 | /* make circular */ | |
141 | desc[fragcount-1].next_desc_addr = desc; | |
142 | } | |
143 | ||
144 | int sport_config_tx_dma(struct sport_device *sport, void *buf, | |
145 | int fragcount, size_t fragsize) | |
146 | { | |
147 | unsigned int count; | |
148 | unsigned int cfg; | |
149 | dma_addr_t addr; | |
150 | ||
151 | count = fragsize/sport->wdsize; | |
152 | ||
153 | if (sport->tx_desc) | |
154 | dma_free_coherent(NULL, sport->tx_desc_size, | |
155 | sport->tx_desc, 0); | |
156 | ||
157 | sport->tx_desc = dma_alloc_coherent(NULL, | |
158 | fragcount * sizeof(struct dmasg), &addr, 0); | |
159 | sport->tx_desc_size = fragcount * sizeof(struct dmasg); | |
160 | if (!sport->tx_desc) | |
161 | return -ENOMEM; | |
162 | ||
163 | sport->tx_buf = buf; | |
164 | sport->tx_fragsize = fragsize; | |
165 | sport->tx_frags = fragcount; | |
166 | cfg = DMAFLOW_LIST | DI_EN | compute_wdsize(sport->wdsize) | NDSIZE_6; | |
167 | ||
168 | setup_desc(sport->tx_desc, buf, fragcount, fragsize, | |
169 | cfg|DMAEN, count, sport->wdsize); | |
170 | ||
171 | return 0; | |
172 | } | |
173 | EXPORT_SYMBOL(sport_config_tx_dma); | |
174 | ||
175 | int sport_config_rx_dma(struct sport_device *sport, void *buf, | |
176 | int fragcount, size_t fragsize) | |
177 | { | |
178 | unsigned int count; | |
179 | unsigned int cfg; | |
180 | dma_addr_t addr; | |
181 | ||
182 | count = fragsize/sport->wdsize; | |
183 | ||
184 | if (sport->rx_desc) | |
185 | dma_free_coherent(NULL, sport->rx_desc_size, | |
186 | sport->rx_desc, 0); | |
187 | ||
188 | sport->rx_desc = dma_alloc_coherent(NULL, | |
189 | fragcount * sizeof(struct dmasg), &addr, 0); | |
190 | sport->rx_desc_size = fragcount * sizeof(struct dmasg); | |
191 | if (!sport->rx_desc) | |
192 | return -ENOMEM; | |
193 | ||
194 | sport->rx_buf = buf; | |
195 | sport->rx_fragsize = fragsize; | |
196 | sport->rx_frags = fragcount; | |
197 | cfg = DMAFLOW_LIST | DI_EN | compute_wdsize(sport->wdsize) | |
198 | | WNR | NDSIZE_6; | |
199 | ||
200 | setup_desc(sport->rx_desc, buf, fragcount, fragsize, | |
201 | cfg|DMAEN, count, sport->wdsize); | |
202 | ||
203 | return 0; | |
204 | } | |
205 | EXPORT_SYMBOL(sport_config_rx_dma); | |
206 | ||
207 | unsigned long sport_curr_offset_tx(struct sport_device *sport) | |
208 | { | |
209 | unsigned long curr = get_dma_curr_addr(sport->tx_dma_chan); | |
210 | ||
211 | return (unsigned char *)curr - sport->tx_buf; | |
212 | } | |
213 | EXPORT_SYMBOL(sport_curr_offset_tx); | |
214 | ||
215 | unsigned long sport_curr_offset_rx(struct sport_device *sport) | |
216 | { | |
217 | unsigned long curr = get_dma_curr_addr(sport->rx_dma_chan); | |
218 | ||
219 | return (unsigned char *)curr - sport->rx_buf; | |
220 | } | |
221 | EXPORT_SYMBOL(sport_curr_offset_rx); | |
222 | ||
223 | static irqreturn_t sport_tx_irq(int irq, void *dev_id) | |
224 | { | |
225 | struct sport_device *sport = dev_id; | |
226 | static unsigned long status; | |
227 | ||
228 | status = get_dma_curr_irqstat(sport->tx_dma_chan); | |
229 | if (status & (DMA_DONE|DMA_ERR)) { | |
230 | clear_dma_irqstat(sport->tx_dma_chan); | |
231 | SSYNC(); | |
232 | } | |
233 | if (sport->tx_callback) | |
234 | sport->tx_callback(sport->tx_data); | |
235 | return IRQ_HANDLED; | |
236 | } | |
237 | ||
238 | static irqreturn_t sport_rx_irq(int irq, void *dev_id) | |
239 | { | |
240 | struct sport_device *sport = dev_id; | |
241 | unsigned long status; | |
242 | ||
243 | status = get_dma_curr_irqstat(sport->rx_dma_chan); | |
244 | if (status & (DMA_DONE|DMA_ERR)) { | |
245 | clear_dma_irqstat(sport->rx_dma_chan); | |
246 | SSYNC(); | |
247 | } | |
248 | if (sport->rx_callback) | |
249 | sport->rx_callback(sport->rx_data); | |
250 | return IRQ_HANDLED; | |
251 | } | |
252 | ||
253 | static irqreturn_t sport_err_irq(int irq, void *dev_id) | |
254 | { | |
255 | struct sport_device *sport = dev_id; | |
256 | struct device *dev = &sport->pdev->dev; | |
257 | ||
258 | if (sport->tx_regs->spctl & SPORT_CTL_DERRPRI) | |
f4a63483 | 259 | dev_err(dev, "sport error: TUVF\n"); |
d2aae47f | 260 | if (sport->rx_regs->spctl & SPORT_CTL_DERRPRI) |
f4a63483 | 261 | dev_err(dev, "sport error: ROVF\n"); |
d2aae47f SJ |
262 | |
263 | return IRQ_HANDLED; | |
264 | } | |
265 | ||
266 | static int sport_get_resource(struct sport_device *sport) | |
267 | { | |
268 | struct platform_device *pdev = sport->pdev; | |
269 | struct device *dev = &pdev->dev; | |
270 | struct bfin_snd_platform_data *pdata = dev->platform_data; | |
271 | struct resource *res; | |
272 | ||
273 | if (!pdata) { | |
274 | dev_err(dev, "No platform data\n"); | |
275 | return -ENODEV; | |
276 | } | |
277 | sport->pin_req = pdata->pin_req; | |
278 | ||
279 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
280 | if (!res) { | |
281 | dev_err(dev, "No tx MEM resource\n"); | |
282 | return -ENODEV; | |
283 | } | |
284 | sport->tx_regs = (struct sport_register *)res->start; | |
285 | ||
286 | res = platform_get_resource(pdev, IORESOURCE_MEM, 1); | |
287 | if (!res) { | |
288 | dev_err(dev, "No rx MEM resource\n"); | |
289 | return -ENODEV; | |
290 | } | |
291 | sport->rx_regs = (struct sport_register *)res->start; | |
292 | ||
293 | res = platform_get_resource(pdev, IORESOURCE_DMA, 0); | |
294 | if (!res) { | |
295 | dev_err(dev, "No tx DMA resource\n"); | |
296 | return -ENODEV; | |
297 | } | |
298 | sport->tx_dma_chan = res->start; | |
299 | ||
300 | res = platform_get_resource(pdev, IORESOURCE_DMA, 1); | |
301 | if (!res) { | |
302 | dev_err(dev, "No rx DMA resource\n"); | |
303 | return -ENODEV; | |
304 | } | |
305 | sport->rx_dma_chan = res->start; | |
306 | ||
307 | res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); | |
308 | if (!res) { | |
309 | dev_err(dev, "No tx error irq resource\n"); | |
310 | return -ENODEV; | |
311 | } | |
312 | sport->tx_err_irq = res->start; | |
313 | ||
314 | res = platform_get_resource(pdev, IORESOURCE_IRQ, 1); | |
315 | if (!res) { | |
316 | dev_err(dev, "No rx error irq resource\n"); | |
317 | return -ENODEV; | |
318 | } | |
319 | sport->rx_err_irq = res->start; | |
320 | ||
321 | return 0; | |
322 | } | |
323 | ||
324 | static int sport_request_resource(struct sport_device *sport) | |
325 | { | |
326 | struct device *dev = &sport->pdev->dev; | |
327 | int ret; | |
328 | ||
329 | ret = peripheral_request_list(sport->pin_req, "soc-audio"); | |
330 | if (ret) { | |
331 | dev_err(dev, "Unable to request sport pin\n"); | |
332 | return ret; | |
333 | } | |
334 | ||
335 | ret = request_dma(sport->tx_dma_chan, "SPORT TX Data"); | |
336 | if (ret) { | |
337 | dev_err(dev, "Unable to allocate DMA channel for sport tx\n"); | |
338 | goto err_tx_dma; | |
339 | } | |
340 | set_dma_callback(sport->tx_dma_chan, sport_tx_irq, sport); | |
341 | ||
342 | ret = request_dma(sport->rx_dma_chan, "SPORT RX Data"); | |
343 | if (ret) { | |
344 | dev_err(dev, "Unable to allocate DMA channel for sport rx\n"); | |
345 | goto err_rx_dma; | |
346 | } | |
347 | set_dma_callback(sport->rx_dma_chan, sport_rx_irq, sport); | |
348 | ||
349 | ret = request_irq(sport->tx_err_irq, sport_err_irq, | |
350 | 0, "SPORT TX ERROR", sport); | |
351 | if (ret) { | |
352 | dev_err(dev, "Unable to allocate tx error IRQ for sport\n"); | |
353 | goto err_tx_irq; | |
354 | } | |
355 | ||
356 | ret = request_irq(sport->rx_err_irq, sport_err_irq, | |
357 | 0, "SPORT RX ERROR", sport); | |
358 | if (ret) { | |
359 | dev_err(dev, "Unable to allocate rx error IRQ for sport\n"); | |
360 | goto err_rx_irq; | |
361 | } | |
362 | ||
363 | return 0; | |
364 | err_rx_irq: | |
365 | free_irq(sport->tx_err_irq, sport); | |
366 | err_tx_irq: | |
367 | free_dma(sport->rx_dma_chan); | |
368 | err_rx_dma: | |
369 | free_dma(sport->tx_dma_chan); | |
370 | err_tx_dma: | |
371 | peripheral_free_list(sport->pin_req); | |
372 | return ret; | |
373 | } | |
374 | ||
375 | static void sport_free_resource(struct sport_device *sport) | |
376 | { | |
377 | free_irq(sport->rx_err_irq, sport); | |
378 | free_irq(sport->tx_err_irq, sport); | |
379 | free_dma(sport->rx_dma_chan); | |
380 | free_dma(sport->tx_dma_chan); | |
381 | peripheral_free_list(sport->pin_req); | |
382 | } | |
383 | ||
384 | struct sport_device *sport_create(struct platform_device *pdev) | |
385 | { | |
386 | struct device *dev = &pdev->dev; | |
387 | struct sport_device *sport; | |
388 | int ret; | |
389 | ||
390 | sport = kzalloc(sizeof(*sport), GFP_KERNEL); | |
391 | if (!sport) { | |
392 | dev_err(dev, "Unable to allocate memory for sport device\n"); | |
393 | return NULL; | |
394 | } | |
395 | sport->pdev = pdev; | |
396 | ||
397 | ret = sport_get_resource(sport); | |
398 | if (ret) { | |
399 | kfree(sport); | |
400 | return NULL; | |
401 | } | |
402 | ||
403 | ret = sport_request_resource(sport); | |
404 | if (ret) { | |
405 | kfree(sport); | |
406 | return NULL; | |
407 | } | |
408 | ||
409 | dev_dbg(dev, "SPORT create success\n"); | |
410 | return sport; | |
411 | } | |
412 | EXPORT_SYMBOL(sport_create); | |
413 | ||
414 | void sport_delete(struct sport_device *sport) | |
415 | { | |
8b5eae13 SJ |
416 | if (sport->tx_desc) |
417 | dma_free_coherent(NULL, sport->tx_desc_size, | |
418 | sport->tx_desc, 0); | |
419 | if (sport->rx_desc) | |
420 | dma_free_coherent(NULL, sport->rx_desc_size, | |
421 | sport->rx_desc, 0); | |
d2aae47f | 422 | sport_free_resource(sport); |
8b5eae13 | 423 | kfree(sport); |
d2aae47f SJ |
424 | } |
425 | EXPORT_SYMBOL(sport_delete); | |
426 | ||
427 | MODULE_DESCRIPTION("Analog Devices BF6XX SPORT driver"); | |
428 | MODULE_AUTHOR("Scott Jiang <Scott.Jiang.Linux@gmail.com>"); | |
429 | MODULE_LICENSE("GPL v2"); |