2 * bf6xx_sport.c Analog Devices BF6XX SPORT driver
4 * Copyright (c) 2012 Analog Devices Inc.
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.
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.
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.
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>
27 #include <asm/blackfin.h>
29 #include <asm/portmux.h>
31 #include "bf6xx-sport.h"
33 int sport_set_tx_params(struct sport_device *sport,
34 struct sport_params *params)
36 if (sport->tx_regs->spctl & SPORT_CTL_SPENPRI)
38 sport->tx_regs->spctl = params->spctl | SPORT_CTL_SPTRAN;
39 sport->tx_regs->div = params->div;
43 EXPORT_SYMBOL(sport_set_tx_params);
45 int sport_set_rx_params(struct sport_device *sport,
46 struct sport_params *params)
48 if (sport->rx_regs->spctl & SPORT_CTL_SPENPRI)
50 sport->rx_regs->spctl = params->spctl & ~SPORT_CTL_SPTRAN;
51 sport->rx_regs->div = params->div;
55 EXPORT_SYMBOL(sport_set_rx_params);
57 static int compute_wdsize(size_t wdsize)
61 return WDSIZE_8 | PSIZE_8;
63 return WDSIZE_16 | PSIZE_16;
65 return WDSIZE_32 | PSIZE_32;
69 void sport_tx_start(struct sport_device *sport)
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;
78 EXPORT_SYMBOL(sport_tx_start);
80 void sport_rx_start(struct sport_device *sport)
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;
89 EXPORT_SYMBOL(sport_rx_start);
91 void sport_tx_stop(struct sport_device *sport)
93 sport->tx_regs->spctl &= ~SPORT_CTL_SPENPRI;
95 disable_dma(sport->tx_dma_chan);
97 EXPORT_SYMBOL(sport_tx_stop);
99 void sport_rx_stop(struct sport_device *sport)
101 sport->rx_regs->spctl &= ~SPORT_CTL_SPENPRI;
103 disable_dma(sport->rx_dma_chan);
105 EXPORT_SYMBOL(sport_rx_stop);
107 void sport_set_tx_callback(struct sport_device *sport,
108 void (*tx_callback)(void *), void *tx_data)
110 sport->tx_callback = tx_callback;
111 sport->tx_data = tx_data;
113 EXPORT_SYMBOL(sport_set_tx_callback);
115 void sport_set_rx_callback(struct sport_device *sport,
116 void (*rx_callback)(void *), void *rx_data)
118 sport->rx_callback = rx_callback;
119 sport->rx_data = rx_data;
121 EXPORT_SYMBOL(sport_set_rx_callback);
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)
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;
134 desc[i].x_count = count;
135 desc[i].x_modify = wdsize;
137 desc[i].y_modify = 0;
141 desc[fragcount - 1].next_desc_addr = desc;
144 int sport_config_tx_dma(struct sport_device *sport, void *buf,
145 int fragcount, size_t fragsize)
151 count = fragsize / sport->wdsize;
154 dma_free_coherent(NULL, sport->tx_desc_size,
157 sport->tx_desc = dma_alloc_coherent(NULL,
158 fragcount * sizeof(struct dmasg), &addr, 0);
159 sport->tx_desc_size = fragcount * sizeof(struct dmasg);
164 sport->tx_fragsize = fragsize;
165 sport->tx_frags = fragcount;
166 cfg = DMAFLOW_LIST | DI_EN | compute_wdsize(sport->wdsize) | NDSIZE_6;
168 setup_desc(sport->tx_desc, buf, fragcount, fragsize,
169 cfg | DMAEN, count, sport->wdsize);
172 EXPORT_SYMBOL(sport_config_tx_dma);
174 int sport_config_rx_dma(struct sport_device *sport, void *buf,
175 int fragcount, size_t fragsize)
181 count = fragsize / sport->wdsize;
184 dma_free_coherent(NULL, sport->rx_desc_size,
187 sport->rx_desc = dma_alloc_coherent(NULL,
188 fragcount * sizeof(struct dmasg), &addr, 0);
189 sport->rx_desc_size = fragcount * sizeof(struct dmasg);
194 sport->rx_fragsize = fragsize;
195 sport->rx_frags = fragcount;
196 cfg = DMAFLOW_LIST | DI_EN | compute_wdsize(sport->wdsize)
199 setup_desc(sport->rx_desc, buf, fragcount, fragsize,
200 cfg | DMAEN, count, sport->wdsize);
203 EXPORT_SYMBOL(sport_config_rx_dma);
205 unsigned long sport_curr_offset_tx(struct sport_device *sport)
207 unsigned long curr = get_dma_curr_addr(sport->tx_dma_chan);
209 return (unsigned char *)curr - sport->tx_buf;
211 EXPORT_SYMBOL(sport_curr_offset_tx);
213 unsigned long sport_curr_offset_rx(struct sport_device *sport)
215 unsigned long curr = get_dma_curr_addr(sport->rx_dma_chan);
217 return (unsigned char *)curr - sport->rx_buf;
219 EXPORT_SYMBOL(sport_curr_offset_rx);
221 static irqreturn_t sport_tx_irq(int irq, void *dev_id)
223 struct sport_device *sport = dev_id;
224 static unsigned long status;
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);
231 if (sport->tx_callback)
232 sport->tx_callback(sport->tx_data);
236 static irqreturn_t sport_rx_irq(int irq, void *dev_id)
238 struct sport_device *sport = dev_id;
239 unsigned long status;
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);
246 if (sport->rx_callback)
247 sport->rx_callback(sport->rx_data);
251 static irqreturn_t sport_err_irq(int irq, void *dev_id)
253 struct sport_device *sport = dev_id;
254 struct device *dev = &sport->pdev->dev;
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");
264 static int sport_get_resource(struct sport_device *sport)
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;
272 dev_err(dev, "No platform data\n");
275 sport->pin_req = pdata->pin_req;
277 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
279 dev_err(dev, "No tx MEM resource\n");
282 sport->tx_regs = (struct sport_register *)res->start;
284 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
286 dev_err(dev, "No rx MEM resource\n");
289 sport->rx_regs = (struct sport_register *)res->start;
291 res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
293 dev_err(dev, "No tx DMA resource\n");
296 sport->tx_dma_chan = res->start;
298 res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
300 dev_err(dev, "No rx DMA resource\n");
303 sport->rx_dma_chan = res->start;
305 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
307 dev_err(dev, "No tx error irq resource\n");
310 sport->tx_err_irq = res->start;
312 res = platform_get_resource(pdev, IORESOURCE_IRQ, 1);
314 dev_err(dev, "No rx error irq resource\n");
317 sport->rx_err_irq = res->start;
322 static int sport_request_resource(struct sport_device *sport)
324 struct device *dev = &sport->pdev->dev;
327 ret = peripheral_request_list(sport->pin_req, "soc-audio");
329 dev_err(dev, "Unable to request sport pin\n");
333 ret = request_dma(sport->tx_dma_chan, "SPORT TX Data");
335 dev_err(dev, "Unable to allocate DMA channel for sport tx\n");
338 set_dma_callback(sport->tx_dma_chan, sport_tx_irq, sport);
340 ret = request_dma(sport->rx_dma_chan, "SPORT RX Data");
342 dev_err(dev, "Unable to allocate DMA channel for sport rx\n");
345 set_dma_callback(sport->rx_dma_chan, sport_rx_irq, sport);
347 ret = request_irq(sport->tx_err_irq, sport_err_irq,
348 0, "SPORT TX ERROR", sport);
350 dev_err(dev, "Unable to allocate tx error IRQ for sport\n");
354 ret = request_irq(sport->rx_err_irq, sport_err_irq,
355 0, "SPORT RX ERROR", sport);
357 dev_err(dev, "Unable to allocate rx error IRQ for sport\n");
363 free_irq(sport->tx_err_irq, sport);
365 free_dma(sport->rx_dma_chan);
367 free_dma(sport->tx_dma_chan);
369 peripheral_free_list(sport->pin_req);
373 static void sport_free_resource(struct sport_device *sport)
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);
382 struct sport_device *sport_create(struct platform_device *pdev)
384 struct device *dev = &pdev->dev;
385 struct sport_device *sport;
388 sport = kzalloc(sizeof(*sport), GFP_KERNEL);
394 ret = sport_get_resource(sport);
398 ret = sport_request_resource(sport);
402 dev_dbg(dev, "SPORT create success\n");
408 EXPORT_SYMBOL(sport_create);
410 void sport_delete(struct sport_device *sport)
413 dma_free_coherent(NULL, sport->tx_desc_size,
416 dma_free_coherent(NULL, sport->rx_desc_size,
418 sport_free_resource(sport);
421 EXPORT_SYMBOL(sport_delete);
423 MODULE_DESCRIPTION("Analog Devices BF6XX SPORT driver");
424 MODULE_AUTHOR("Scott Jiang <Scott.Jiang.Linux@gmail.com>");
425 MODULE_LICENSE("GPL v2");