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);
173 EXPORT_SYMBOL(sport_config_tx_dma);
175 int sport_config_rx_dma(struct sport_device *sport, void *buf,
176 int fragcount, size_t fragsize)
182 count = fragsize/sport->wdsize;
185 dma_free_coherent(NULL, sport->rx_desc_size,
188 sport->rx_desc = dma_alloc_coherent(NULL,
189 fragcount * sizeof(struct dmasg), &addr, 0);
190 sport->rx_desc_size = fragcount * sizeof(struct dmasg);
195 sport->rx_fragsize = fragsize;
196 sport->rx_frags = fragcount;
197 cfg = DMAFLOW_LIST | DI_EN | compute_wdsize(sport->wdsize)
200 setup_desc(sport->rx_desc, buf, fragcount, fragsize,
201 cfg|DMAEN, count, sport->wdsize);
205 EXPORT_SYMBOL(sport_config_rx_dma);
207 unsigned long sport_curr_offset_tx(struct sport_device *sport)
209 unsigned long curr = get_dma_curr_addr(sport->tx_dma_chan);
211 return (unsigned char *)curr - sport->tx_buf;
213 EXPORT_SYMBOL(sport_curr_offset_tx);
215 unsigned long sport_curr_offset_rx(struct sport_device *sport)
217 unsigned long curr = get_dma_curr_addr(sport->rx_dma_chan);
219 return (unsigned char *)curr - sport->rx_buf;
221 EXPORT_SYMBOL(sport_curr_offset_rx);
223 static irqreturn_t sport_tx_irq(int irq, void *dev_id)
225 struct sport_device *sport = dev_id;
226 static unsigned long status;
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);
233 if (sport->tx_callback)
234 sport->tx_callback(sport->tx_data);
238 static irqreturn_t sport_rx_irq(int irq, void *dev_id)
240 struct sport_device *sport = dev_id;
241 unsigned long status;
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);
248 if (sport->rx_callback)
249 sport->rx_callback(sport->rx_data);
253 static irqreturn_t sport_err_irq(int irq, void *dev_id)
255 struct sport_device *sport = dev_id;
256 struct device *dev = &sport->pdev->dev;
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");
266 static int sport_get_resource(struct sport_device *sport)
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;
274 dev_err(dev, "No platform data\n");
277 sport->pin_req = pdata->pin_req;
279 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
281 dev_err(dev, "No tx MEM resource\n");
284 sport->tx_regs = (struct sport_register *)res->start;
286 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
288 dev_err(dev, "No rx MEM resource\n");
291 sport->rx_regs = (struct sport_register *)res->start;
293 res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
295 dev_err(dev, "No tx DMA resource\n");
298 sport->tx_dma_chan = res->start;
300 res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
302 dev_err(dev, "No rx DMA resource\n");
305 sport->rx_dma_chan = res->start;
307 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
309 dev_err(dev, "No tx error irq resource\n");
312 sport->tx_err_irq = res->start;
314 res = platform_get_resource(pdev, IORESOURCE_IRQ, 1);
316 dev_err(dev, "No rx error irq resource\n");
319 sport->rx_err_irq = res->start;
324 static int sport_request_resource(struct sport_device *sport)
326 struct device *dev = &sport->pdev->dev;
329 ret = peripheral_request_list(sport->pin_req, "soc-audio");
331 dev_err(dev, "Unable to request sport pin\n");
335 ret = request_dma(sport->tx_dma_chan, "SPORT TX Data");
337 dev_err(dev, "Unable to allocate DMA channel for sport tx\n");
340 set_dma_callback(sport->tx_dma_chan, sport_tx_irq, sport);
342 ret = request_dma(sport->rx_dma_chan, "SPORT RX Data");
344 dev_err(dev, "Unable to allocate DMA channel for sport rx\n");
347 set_dma_callback(sport->rx_dma_chan, sport_rx_irq, sport);
349 ret = request_irq(sport->tx_err_irq, sport_err_irq,
350 0, "SPORT TX ERROR", sport);
352 dev_err(dev, "Unable to allocate tx error IRQ for sport\n");
356 ret = request_irq(sport->rx_err_irq, sport_err_irq,
357 0, "SPORT RX ERROR", sport);
359 dev_err(dev, "Unable to allocate rx error IRQ for sport\n");
365 free_irq(sport->tx_err_irq, sport);
367 free_dma(sport->rx_dma_chan);
369 free_dma(sport->tx_dma_chan);
371 peripheral_free_list(sport->pin_req);
375 static void sport_free_resource(struct sport_device *sport)
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);
384 struct sport_device *sport_create(struct platform_device *pdev)
386 struct device *dev = &pdev->dev;
387 struct sport_device *sport;
390 sport = kzalloc(sizeof(*sport), GFP_KERNEL);
392 dev_err(dev, "Unable to allocate memory for sport device\n");
397 ret = sport_get_resource(sport);
403 ret = sport_request_resource(sport);
409 dev_dbg(dev, "SPORT create success\n");
412 EXPORT_SYMBOL(sport_create);
414 void sport_delete(struct sport_device *sport)
416 sport_free_resource(sport);
418 EXPORT_SYMBOL(sport_delete);
420 MODULE_DESCRIPTION("Analog Devices BF6XX SPORT driver");
421 MODULE_AUTHOR("Scott Jiang <Scott.Jiang.Linux@gmail.com>");
422 MODULE_LICENSE("GPL v2");