1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * atmel-pcm.c  --  ALSA PCM interface for the Atmel atmel SoC.
10  * Based on at91-pcm. by:
14  * Based on pxa2xx-pcm.c by:
25 #include <linux/dma-mapping.h>
27 #include <linux/atmel-ssc.h>
34 #include "atmel-pcm.h"
40 	struct snd_card *card = rtd->card->snd_card;  in atmel_pcm_new()
43 	ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));  in atmel_pcm_new()
47 	snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_DEV,  in atmel_pcm_new()
48 				       card->dev, ATMEL_SSC_DMABUF_SIZE,  in atmel_pcm_new()
54 /*--------------------------------------------------------------------------*\
56 \*--------------------------------------------------------------------------*/
73 /*--------------------------------------------------------------------------*\
75 \*--------------------------------------------------------------------------*/
85 /*--------------------------------------------------------------------------*\
87 \*--------------------------------------------------------------------------*/
91 	struct atmel_runtime_data *prtd = substream->runtime->private_data;  in atmel_pcm_dma_irq()
92 	struct atmel_pcm_dma_params *params = prtd->params;  in atmel_pcm_dma_irq()
97 	if (ssc_sr & params->mask->ssc_endbuf) {  in atmel_pcm_dma_irq()
98 		pr_warn("atmel-pcm: buffer %s on %s (SSC_SR=%#x, count=%d)\n",  in atmel_pcm_dma_irq()
99 				substream->stream == SNDRV_PCM_STREAM_PLAYBACK  in atmel_pcm_dma_irq()
101 				params->name, ssc_sr, count);  in atmel_pcm_dma_irq()
103 		/* re-start the PDC */  in atmel_pcm_dma_irq()
104 		ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,  in atmel_pcm_dma_irq()
105 			   params->mask->pdc_disable);  in atmel_pcm_dma_irq()
106 		prtd->period_ptr += prtd->period_size;  in atmel_pcm_dma_irq()
107 		if (prtd->period_ptr >= prtd->dma_buffer_end)  in atmel_pcm_dma_irq()
108 			prtd->period_ptr = prtd->dma_buffer;  in atmel_pcm_dma_irq()
110 		ssc_writex(params->ssc->regs, params->pdc->xpr,  in atmel_pcm_dma_irq()
111 			   prtd->period_ptr);  in atmel_pcm_dma_irq()
112 		ssc_writex(params->ssc->regs, params->pdc->xcr,  in atmel_pcm_dma_irq()
113 			   prtd->period_size / params->pdc_xfer_size);  in atmel_pcm_dma_irq()
114 		ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,  in atmel_pcm_dma_irq()
115 			   params->mask->pdc_enable);  in atmel_pcm_dma_irq()
118 	if (ssc_sr & params->mask->ssc_endx) {  in atmel_pcm_dma_irq()
120 		prtd->period_ptr += prtd->period_size;  in atmel_pcm_dma_irq()
121 		if (prtd->period_ptr >= prtd->dma_buffer_end)  in atmel_pcm_dma_irq()
122 			prtd->period_ptr = prtd->dma_buffer;  in atmel_pcm_dma_irq()
124 		ssc_writex(params->ssc->regs, params->pdc->xnpr,  in atmel_pcm_dma_irq()
125 			   prtd->period_ptr);  in atmel_pcm_dma_irq()
126 		ssc_writex(params->ssc->regs, params->pdc->xncr,  in atmel_pcm_dma_irq()
127 			   prtd->period_size / params->pdc_xfer_size);  in atmel_pcm_dma_irq()
134 /*--------------------------------------------------------------------------*\
136 \*--------------------------------------------------------------------------*/
141 	struct snd_pcm_runtime *runtime = substream->runtime;  in atmel_pcm_hw_params()
142 	struct atmel_runtime_data *prtd = runtime->private_data;  in atmel_pcm_hw_params()
148 	prtd->params = snd_soc_dai_get_dma_data(snd_soc_rtd_to_cpu(rtd, 0), substream);  in atmel_pcm_hw_params()
149 	prtd->params->dma_intr_handler = atmel_pcm_dma_irq;  in atmel_pcm_hw_params()
151 	prtd->dma_buffer = runtime->dma_addr;  in atmel_pcm_hw_params()
152 	prtd->dma_buffer_end = runtime->dma_addr + runtime->dma_bytes;  in atmel_pcm_hw_params()
153 	prtd->period_size = params_period_bytes(params);  in atmel_pcm_hw_params()
155 	pr_debug("atmel-pcm: "  in atmel_pcm_hw_params()
158 		prtd->params->name,  in atmel_pcm_hw_params()
159 		runtime->dma_bytes,  in atmel_pcm_hw_params()
160 		prtd->period_size);  in atmel_pcm_hw_params()
167 	struct atmel_runtime_data *prtd = substream->runtime->private_data;  in atmel_pcm_hw_free()
168 	struct atmel_pcm_dma_params *params = prtd->params;  in atmel_pcm_hw_free()
171 		ssc_writex(params->ssc->regs, SSC_PDC_PTCR,  in atmel_pcm_hw_free()
172 			   params->mask->pdc_disable);  in atmel_pcm_hw_free()
173 		prtd->params->dma_intr_handler = NULL;  in atmel_pcm_hw_free()
182 	struct atmel_runtime_data *prtd = substream->runtime->private_data;  in atmel_pcm_prepare()
183 	struct atmel_pcm_dma_params *params = prtd->params;  in atmel_pcm_prepare()
185 	ssc_writex(params->ssc->regs, SSC_IDR,  in atmel_pcm_prepare()
186 		   params->mask->ssc_endx | params->mask->ssc_endbuf);  in atmel_pcm_prepare()
187 	ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,  in atmel_pcm_prepare()
188 		   params->mask->pdc_disable);  in atmel_pcm_prepare()
195 	struct snd_pcm_runtime *rtd = substream->runtime;  in atmel_pcm_trigger()
196 	struct atmel_runtime_data *prtd = rtd->private_data;  in atmel_pcm_trigger()
197 	struct atmel_pcm_dma_params *params = prtd->params;  in atmel_pcm_trigger()
200 	pr_debug("atmel-pcm:buffer_size = %ld,"  in atmel_pcm_trigger()
202 		rtd->buffer_size, rtd->dma_area, rtd->dma_bytes);  in atmel_pcm_trigger()
206 		prtd->period_ptr = prtd->dma_buffer;  in atmel_pcm_trigger()
208 		ssc_writex(params->ssc->regs, params->pdc->xpr,  in atmel_pcm_trigger()
209 			   prtd->period_ptr);  in atmel_pcm_trigger()
210 		ssc_writex(params->ssc->regs, params->pdc->xcr,  in atmel_pcm_trigger()
211 			   prtd->period_size / params->pdc_xfer_size);  in atmel_pcm_trigger()
213 		prtd->period_ptr += prtd->period_size;  in atmel_pcm_trigger()
214 		ssc_writex(params->ssc->regs, params->pdc->xnpr,  in atmel_pcm_trigger()
215 			   prtd->period_ptr);  in atmel_pcm_trigger()
216 		ssc_writex(params->ssc->regs, params->pdc->xncr,  in atmel_pcm_trigger()
217 			   prtd->period_size / params->pdc_xfer_size);  in atmel_pcm_trigger()
219 		pr_debug("atmel-pcm: trigger: "  in atmel_pcm_trigger()
222 			(unsigned long)prtd->period_ptr,  in atmel_pcm_trigger()
223 			ssc_readx(params->ssc->regs, params->pdc->xpr),  in atmel_pcm_trigger()
224 			ssc_readx(params->ssc->regs, params->pdc->xcr),  in atmel_pcm_trigger()
225 			ssc_readx(params->ssc->regs, params->pdc->xnpr),  in atmel_pcm_trigger()
226 			ssc_readx(params->ssc->regs, params->pdc->xncr));  in atmel_pcm_trigger()
228 		ssc_writex(params->ssc->regs, SSC_IER,  in atmel_pcm_trigger()
229 			   params->mask->ssc_endx | params->mask->ssc_endbuf);  in atmel_pcm_trigger()
230 		ssc_writex(params->ssc->regs, SSC_PDC_PTCR,  in atmel_pcm_trigger()
231 			   params->mask->pdc_enable);  in atmel_pcm_trigger()
234 			ssc_readx(params->ssc->regs, SSC_SR),  in atmel_pcm_trigger()
235 			ssc_readx(params->ssc->regs, SSC_IER));  in atmel_pcm_trigger()
241 		ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,  in atmel_pcm_trigger()
242 			   params->mask->pdc_disable);  in atmel_pcm_trigger()
247 		ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,  in atmel_pcm_trigger()
248 			   params->mask->pdc_enable);  in atmel_pcm_trigger()
252 		ret = -EINVAL;  in atmel_pcm_trigger()
261 	struct snd_pcm_runtime *runtime = substream->runtime;  in atmel_pcm_pointer()
262 	struct atmel_runtime_data *prtd = runtime->private_data;  in atmel_pcm_pointer()
263 	struct atmel_pcm_dma_params *params = prtd->params;  in atmel_pcm_pointer()
267 	ptr = (dma_addr_t) ssc_readx(params->ssc->regs, params->pdc->xpr);  in atmel_pcm_pointer()
268 	x = bytes_to_frames(runtime, ptr - prtd->dma_buffer);  in atmel_pcm_pointer()
270 	if (x == runtime->buffer_size)  in atmel_pcm_pointer()
279 	struct snd_pcm_runtime *runtime = substream->runtime;  in atmel_pcm_open()
293 		ret = -ENOMEM;  in atmel_pcm_open()
296 	runtime->private_data = prtd;  in atmel_pcm_open()
305 	struct atmel_runtime_data *prtd = substream->runtime->private_data;  in atmel_pcm_close()