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
sport_set_tx_params(struct sport_device * sport,struct sport_params * params)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
sport_set_rx_params(struct sport_device * sport,struct sport_params * params)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
compute_wdsize(size_t wdsize)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
sport_tx_start(struct sport_device * sport)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
sport_rx_start(struct sport_device * sport)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
sport_tx_stop(struct sport_device * sport)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
sport_rx_stop(struct sport_device * sport)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
sport_set_tx_callback(struct sport_device * sport,void (* tx_callback)(void *),void * tx_data)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
sport_set_rx_callback(struct sport_device * sport,void (* rx_callback)(void *),void * rx_data)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
setup_desc(struct dmasg * desc,void * buf,int fragcount,size_t fragsize,unsigned int cfg,unsigned int count,size_t wdsize)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
sport_config_tx_dma(struct sport_device * sport,void * buf,int fragcount,size_t fragsize)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
sport_config_rx_dma(struct sport_device * sport,void * buf,int fragcount,size_t fragsize)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
sport_curr_offset_tx(struct sport_device * sport)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
sport_curr_offset_rx(struct sport_device * sport)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
sport_tx_irq(int irq,void * dev_id)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
sport_rx_irq(int irq,void * dev_id)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
sport_err_irq(int irq,void * dev_id)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)
259 dev_err(dev, "sport error: TUVF\n");
260 if (sport->rx_regs->spctl & SPORT_CTL_DERRPRI)
261 dev_err(dev, "sport error: ROVF\n");
262
263 return IRQ_HANDLED;
264 }
265
sport_get_resource(struct sport_device * sport)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
sport_request_resource(struct sport_device * sport)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
sport_free_resource(struct sport_device * sport)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
sport_create(struct platform_device * pdev)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
sport_delete(struct sport_device * sport)414 void sport_delete(struct sport_device *sport)
415 {
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);
422 sport_free_resource(sport);
423 kfree(sport);
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");
430