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Scott Jiangd2aae472012-06-20 17:00:30 -04001/*
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
33int 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}
43EXPORT_SYMBOL(sport_set_tx_params);
44
45int 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}
55EXPORT_SYMBOL(sport_set_rx_params);
56
57static 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
69void 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}
78EXPORT_SYMBOL(sport_tx_start);
79
80void 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}
89EXPORT_SYMBOL(sport_rx_start);
90
91void 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}
97EXPORT_SYMBOL(sport_tx_stop);
98
99void 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}
105EXPORT_SYMBOL(sport_rx_stop);
106
107void 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}
113EXPORT_SYMBOL(sport_set_tx_callback);
114
115void 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}
121EXPORT_SYMBOL(sport_set_rx_callback);
122
123static 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]);
Markus Elfring11f25bb2017-08-11 22:20:07 +0200132 desc[i].start_addr = (unsigned long)buf + i * fragsize;
Scott Jiangd2aae472012-06-20 17:00:30 -0400133 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 */
Markus Elfring11f25bb2017-08-11 22:20:07 +0200141 desc[fragcount - 1].next_desc_addr = desc;
Scott Jiangd2aae472012-06-20 17:00:30 -0400142}
143
144int 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
Markus Elfring11f25bb2017-08-11 22:20:07 +0200151 count = fragsize / sport->wdsize;
Scott Jiangd2aae472012-06-20 17:00:30 -0400152
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,
Markus Elfring11f25bb2017-08-11 22:20:07 +0200169 cfg | DMAEN, count, sport->wdsize);
Scott Jiangd2aae472012-06-20 17:00:30 -0400170 return 0;
171}
172EXPORT_SYMBOL(sport_config_tx_dma);
173
174int 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
Markus Elfring11f25bb2017-08-11 22:20:07 +0200181 count = fragsize / sport->wdsize;
Scott Jiangd2aae472012-06-20 17:00:30 -0400182
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,
Markus Elfring11f25bb2017-08-11 22:20:07 +0200200 cfg | DMAEN, count, sport->wdsize);
Scott Jiangd2aae472012-06-20 17:00:30 -0400201 return 0;
202}
203EXPORT_SYMBOL(sport_config_rx_dma);
204
205unsigned 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}
211EXPORT_SYMBOL(sport_curr_offset_tx);
212
213unsigned 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}
219EXPORT_SYMBOL(sport_curr_offset_rx);
220
221static 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);
Markus Elfring11f25bb2017-08-11 22:20:07 +0200227 if (status & (DMA_DONE | DMA_ERR)) {
Scott Jiangd2aae472012-06-20 17:00:30 -0400228 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
236static 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);
Markus Elfring11f25bb2017-08-11 22:20:07 +0200242 if (status & (DMA_DONE | DMA_ERR)) {
Scott Jiangd2aae472012-06-20 17:00:30 -0400243 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
251static 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)
Scott Jiangf4a63482012-06-21 13:51:58 -0400257 dev_err(dev, "sport error: TUVF\n");
Scott Jiangd2aae472012-06-20 17:00:30 -0400258 if (sport->rx_regs->spctl & SPORT_CTL_DERRPRI)
Scott Jiangf4a63482012-06-21 13:51:58 -0400259 dev_err(dev, "sport error: ROVF\n");
Scott Jiangd2aae472012-06-20 17:00:30 -0400260
261 return IRQ_HANDLED;
262}
263
264static 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
322static 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;
362err_rx_irq:
363 free_irq(sport->tx_err_irq, sport);
364err_tx_irq:
365 free_dma(sport->rx_dma_chan);
366err_rx_dma:
367 free_dma(sport->tx_dma_chan);
368err_tx_dma:
369 peripheral_free_list(sport->pin_req);
370 return ret;
371}
372
373static 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
382struct 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);
Markus Elfring60ea0392017-08-11 21:45:37 +0200389 if (!sport)
Scott Jiangd2aae472012-06-20 17:00:30 -0400390 return NULL;
Markus Elfring60ea0392017-08-11 21:45:37 +0200391
Scott Jiangd2aae472012-06-20 17:00:30 -0400392 sport->pdev = pdev;
393
394 ret = sport_get_resource(sport);
Markus Elfring11fca342017-08-11 22:02:47 +0200395 if (ret)
396 goto free_data;
Scott Jiangd2aae472012-06-20 17:00:30 -0400397
398 ret = sport_request_resource(sport);
Markus Elfring11fca342017-08-11 22:02:47 +0200399 if (ret)
400 goto free_data;
Scott Jiangd2aae472012-06-20 17:00:30 -0400401
402 dev_dbg(dev, "SPORT create success\n");
403 return sport;
Markus Elfring11fca342017-08-11 22:02:47 +0200404free_data:
405 kfree(sport);
406 return NULL;
Scott Jiangd2aae472012-06-20 17:00:30 -0400407}
408EXPORT_SYMBOL(sport_create);
409
410void sport_delete(struct sport_device *sport)
411{
Scott Jiang8b5eae12012-08-09 18:08:40 -0400412 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);
Scott Jiangd2aae472012-06-20 17:00:30 -0400418 sport_free_resource(sport);
Scott Jiang8b5eae12012-08-09 18:08:40 -0400419 kfree(sport);
Scott Jiangd2aae472012-06-20 17:00:30 -0400420}
421EXPORT_SYMBOL(sport_delete);
422
423MODULE_DESCRIPTION("Analog Devices BF6XX SPORT driver");
424MODULE_AUTHOR("Scott Jiang <Scott.Jiang.Linux@gmail.com>");
425MODULE_LICENSE("GPL v2");