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
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]);
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
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
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}
173EXPORT_SYMBOL(sport_config_tx_dma);
174
175int 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}
205EXPORT_SYMBOL(sport_config_rx_dma);
206
207unsigned 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}
213EXPORT_SYMBOL(sport_curr_offset_tx);
214
215unsigned 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}
221EXPORT_SYMBOL(sport_curr_offset_rx);
222
223static 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
238static 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
253static 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
266static 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
324static 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;
364err_rx_irq:
365	free_irq(sport->tx_err_irq, sport);
366err_tx_irq:
367	free_dma(sport->rx_dma_chan);
368err_rx_dma:
369	free_dma(sport->tx_dma_chan);
370err_tx_dma:
371	peripheral_free_list(sport->pin_req);
372	return ret;
373}
374
375static 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
384struct 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}
412EXPORT_SYMBOL(sport_create);
413
414void 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}
425EXPORT_SYMBOL(sport_delete);
426
427MODULE_DESCRIPTION("Analog Devices BF6XX SPORT driver");
428MODULE_AUTHOR("Scott Jiang <Scott.Jiang.Linux@gmail.com>");
429MODULE_LICENSE("GPL v2");
430