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 return 0;
171 }
172 EXPORT_SYMBOL(sport_config_tx_dma);
173
sport_config_rx_dma(struct sport_device * sport,void * buf,int fragcount,size_t fragsize)174 int sport_config_rx_dma(struct sport_device *sport, void *buf,
175 int fragcount, size_t fragsize)
176 {
177 unsigned int count;
178 unsigned int cfg;
179 dma_addr_t addr;
180
181 count = fragsize / sport->wdsize;
182
183 if (sport->rx_desc)
184 dma_free_coherent(NULL, sport->rx_desc_size,
185 sport->rx_desc, 0);
186
187 sport->rx_desc = dma_alloc_coherent(NULL,
188 fragcount * sizeof(struct dmasg), &addr, 0);
189 sport->rx_desc_size = fragcount * sizeof(struct dmasg);
190 if (!sport->rx_desc)
191 return -ENOMEM;
192
193 sport->rx_buf = buf;
194 sport->rx_fragsize = fragsize;
195 sport->rx_frags = fragcount;
196 cfg = DMAFLOW_LIST | DI_EN | compute_wdsize(sport->wdsize)
197 | WNR | NDSIZE_6;
198
199 setup_desc(sport->rx_desc, buf, fragcount, fragsize,
200 cfg | DMAEN, count, sport->wdsize);
201 return 0;
202 }
203 EXPORT_SYMBOL(sport_config_rx_dma);
204
sport_curr_offset_tx(struct sport_device * sport)205 unsigned long sport_curr_offset_tx(struct sport_device *sport)
206 {
207 unsigned long curr = get_dma_curr_addr(sport->tx_dma_chan);
208
209 return (unsigned char *)curr - sport->tx_buf;
210 }
211 EXPORT_SYMBOL(sport_curr_offset_tx);
212
sport_curr_offset_rx(struct sport_device * sport)213 unsigned long sport_curr_offset_rx(struct sport_device *sport)
214 {
215 unsigned long curr = get_dma_curr_addr(sport->rx_dma_chan);
216
217 return (unsigned char *)curr - sport->rx_buf;
218 }
219 EXPORT_SYMBOL(sport_curr_offset_rx);
220
sport_tx_irq(int irq,void * dev_id)221 static irqreturn_t sport_tx_irq(int irq, void *dev_id)
222 {
223 struct sport_device *sport = dev_id;
224 static unsigned long status;
225
226 status = get_dma_curr_irqstat(sport->tx_dma_chan);
227 if (status & (DMA_DONE | DMA_ERR)) {
228 clear_dma_irqstat(sport->tx_dma_chan);
229 SSYNC();
230 }
231 if (sport->tx_callback)
232 sport->tx_callback(sport->tx_data);
233 return IRQ_HANDLED;
234 }
235
sport_rx_irq(int irq,void * dev_id)236 static irqreturn_t sport_rx_irq(int irq, void *dev_id)
237 {
238 struct sport_device *sport = dev_id;
239 unsigned long status;
240
241 status = get_dma_curr_irqstat(sport->rx_dma_chan);
242 if (status & (DMA_DONE | DMA_ERR)) {
243 clear_dma_irqstat(sport->rx_dma_chan);
244 SSYNC();
245 }
246 if (sport->rx_callback)
247 sport->rx_callback(sport->rx_data);
248 return IRQ_HANDLED;
249 }
250
sport_err_irq(int irq,void * dev_id)251 static irqreturn_t sport_err_irq(int irq, void *dev_id)
252 {
253 struct sport_device *sport = dev_id;
254 struct device *dev = &sport->pdev->dev;
255
256 if (sport->tx_regs->spctl & SPORT_CTL_DERRPRI)
257 dev_err(dev, "sport error: TUVF\n");
258 if (sport->rx_regs->spctl & SPORT_CTL_DERRPRI)
259 dev_err(dev, "sport error: ROVF\n");
260
261 return IRQ_HANDLED;
262 }
263
sport_get_resource(struct sport_device * sport)264 static int sport_get_resource(struct sport_device *sport)
265 {
266 struct platform_device *pdev = sport->pdev;
267 struct device *dev = &pdev->dev;
268 struct bfin_snd_platform_data *pdata = dev->platform_data;
269 struct resource *res;
270
271 if (!pdata) {
272 dev_err(dev, "No platform data\n");
273 return -ENODEV;
274 }
275 sport->pin_req = pdata->pin_req;
276
277 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
278 if (!res) {
279 dev_err(dev, "No tx MEM resource\n");
280 return -ENODEV;
281 }
282 sport->tx_regs = (struct sport_register *)res->start;
283
284 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
285 if (!res) {
286 dev_err(dev, "No rx MEM resource\n");
287 return -ENODEV;
288 }
289 sport->rx_regs = (struct sport_register *)res->start;
290
291 res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
292 if (!res) {
293 dev_err(dev, "No tx DMA resource\n");
294 return -ENODEV;
295 }
296 sport->tx_dma_chan = res->start;
297
298 res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
299 if (!res) {
300 dev_err(dev, "No rx DMA resource\n");
301 return -ENODEV;
302 }
303 sport->rx_dma_chan = res->start;
304
305 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
306 if (!res) {
307 dev_err(dev, "No tx error irq resource\n");
308 return -ENODEV;
309 }
310 sport->tx_err_irq = res->start;
311
312 res = platform_get_resource(pdev, IORESOURCE_IRQ, 1);
313 if (!res) {
314 dev_err(dev, "No rx error irq resource\n");
315 return -ENODEV;
316 }
317 sport->rx_err_irq = res->start;
318
319 return 0;
320 }
321
sport_request_resource(struct sport_device * sport)322 static int sport_request_resource(struct sport_device *sport)
323 {
324 struct device *dev = &sport->pdev->dev;
325 int ret;
326
327 ret = peripheral_request_list(sport->pin_req, "soc-audio");
328 if (ret) {
329 dev_err(dev, "Unable to request sport pin\n");
330 return ret;
331 }
332
333 ret = request_dma(sport->tx_dma_chan, "SPORT TX Data");
334 if (ret) {
335 dev_err(dev, "Unable to allocate DMA channel for sport tx\n");
336 goto err_tx_dma;
337 }
338 set_dma_callback(sport->tx_dma_chan, sport_tx_irq, sport);
339
340 ret = request_dma(sport->rx_dma_chan, "SPORT RX Data");
341 if (ret) {
342 dev_err(dev, "Unable to allocate DMA channel for sport rx\n");
343 goto err_rx_dma;
344 }
345 set_dma_callback(sport->rx_dma_chan, sport_rx_irq, sport);
346
347 ret = request_irq(sport->tx_err_irq, sport_err_irq,
348 0, "SPORT TX ERROR", sport);
349 if (ret) {
350 dev_err(dev, "Unable to allocate tx error IRQ for sport\n");
351 goto err_tx_irq;
352 }
353
354 ret = request_irq(sport->rx_err_irq, sport_err_irq,
355 0, "SPORT RX ERROR", sport);
356 if (ret) {
357 dev_err(dev, "Unable to allocate rx error IRQ for sport\n");
358 goto err_rx_irq;
359 }
360
361 return 0;
362 err_rx_irq:
363 free_irq(sport->tx_err_irq, sport);
364 err_tx_irq:
365 free_dma(sport->rx_dma_chan);
366 err_rx_dma:
367 free_dma(sport->tx_dma_chan);
368 err_tx_dma:
369 peripheral_free_list(sport->pin_req);
370 return ret;
371 }
372
sport_free_resource(struct sport_device * sport)373 static void sport_free_resource(struct sport_device *sport)
374 {
375 free_irq(sport->rx_err_irq, sport);
376 free_irq(sport->tx_err_irq, sport);
377 free_dma(sport->rx_dma_chan);
378 free_dma(sport->tx_dma_chan);
379 peripheral_free_list(sport->pin_req);
380 }
381
sport_create(struct platform_device * pdev)382 struct sport_device *sport_create(struct platform_device *pdev)
383 {
384 struct device *dev = &pdev->dev;
385 struct sport_device *sport;
386 int ret;
387
388 sport = kzalloc(sizeof(*sport), GFP_KERNEL);
389 if (!sport)
390 return NULL;
391
392 sport->pdev = pdev;
393
394 ret = sport_get_resource(sport);
395 if (ret)
396 goto free_data;
397
398 ret = sport_request_resource(sport);
399 if (ret)
400 goto free_data;
401
402 dev_dbg(dev, "SPORT create success\n");
403 return sport;
404 free_data:
405 kfree(sport);
406 return NULL;
407 }
408 EXPORT_SYMBOL(sport_create);
409
sport_delete(struct sport_device * sport)410 void sport_delete(struct sport_device *sport)
411 {
412 if (sport->tx_desc)
413 dma_free_coherent(NULL, sport->tx_desc_size,
414 sport->tx_desc, 0);
415 if (sport->rx_desc)
416 dma_free_coherent(NULL, sport->rx_desc_size,
417 sport->rx_desc, 0);
418 sport_free_resource(sport);
419 kfree(sport);
420 }
421 EXPORT_SYMBOL(sport_delete);
422
423 MODULE_DESCRIPTION("Analog Devices BF6XX SPORT driver");
424 MODULE_AUTHOR("Scott Jiang <Scott.Jiang.Linux@gmail.com>");
425 MODULE_LICENSE("GPL v2");
426