1 // SPDX-License-Identifier: GPL-2.0
11 // FIXME: little-endian only for now
17 #include <linux/dma-mapping.h>
73 #define BRGREG(x)	(*(unsigned long *)(cam->mmio + (x)))
76  * set a minimum of 16kb per period, to avoid interrupt-"storm" and
81  * is 8 bytes; 16kbytes are enough to get skip-free playback of a
106 	struct camelot_pcm *cam = data;  in camelot_txdma()  local
107 	cam->tx_period ^= 1;  in camelot_txdma()
108 	snd_pcm_period_elapsed(cam->tx_ss);  in camelot_txdma()
113 	struct camelot_pcm *cam = data;  in camelot_rxdma()  local
114 	cam->rx_period ^= 1;  in camelot_rxdma()
115 	snd_pcm_period_elapsed(cam->rx_ss);  in camelot_rxdma()
122 	struct camelot_pcm *cam = &cam_pcm_data[snd_soc_rtd_to_cpu(rtd, 0)->id];  in camelot_pcm_open()  local
123 	int recv = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 0:1;  in camelot_pcm_open()
129 	dmairq = (recv) ? cam->txid + 2 : cam->txid;  in camelot_pcm_open()
130 	if (recv) {  in camelot_pcm_open()
131 		cam->rx_ss = substream;  in camelot_pcm_open()
132 		ret = dmabrg_request_irq(dmairq, camelot_rxdma, cam);  in camelot_pcm_open()
133 		if (unlikely(ret)) {  in camelot_pcm_open()
135 			     snd_soc_rtd_to_cpu(rtd, 0)->id);  in camelot_pcm_open()
136 			return -EBUSY;  in camelot_pcm_open()
138 		(void)dmabrg_request_irq(dmairq + 1,camelot_rxdma, cam);  in camelot_pcm_open()
140 		cam->tx_ss = substream;  in camelot_pcm_open()
141 		ret = dmabrg_request_irq(dmairq, camelot_txdma, cam);  in camelot_pcm_open()
142 		if (unlikely(ret)) {  in camelot_pcm_open()
144 			     snd_soc_rtd_to_cpu(rtd, 0)->id);  in camelot_pcm_open()
145 			return -EBUSY;  in camelot_pcm_open()
147 		(void)dmabrg_request_irq(dmairq + 1, camelot_txdma, cam);  in camelot_pcm_open()
156 	struct camelot_pcm *cam = &cam_pcm_data[snd_soc_rtd_to_cpu(rtd, 0)->id];  in camelot_pcm_close()  local
157 	int recv = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 0:1;  in camelot_pcm_close()
160 	dmairq = (recv) ? cam->txid + 2 : cam->txid;  in camelot_pcm_close()
162 	if (recv)  in camelot_pcm_close()
163 		cam->rx_ss = NULL;  in camelot_pcm_close()
165 		cam->tx_ss = NULL;  in camelot_pcm_close()
178 	struct camelot_pcm *cam = &cam_pcm_data[snd_soc_rtd_to_cpu(rtd, 0)->id];  in camelot_hw_params()  local
179 	int recv = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 0:1;  in camelot_hw_params()
181 	if (recv) {  in camelot_hw_params()
182 		cam->rx_period_size = params_period_bytes(hw_params);  in camelot_hw_params()
183 		cam->rx_period = 0;  in camelot_hw_params()
185 		cam->tx_period_size = params_period_bytes(hw_params);  in camelot_hw_params()
186 		cam->tx_period = 0;  in camelot_hw_params()
194 	struct snd_pcm_runtime *runtime = substream->runtime;  in camelot_prepare()
196 	struct camelot_pcm *cam = &cam_pcm_data[snd_soc_rtd_to_cpu(rtd, 0)->id];  in camelot_prepare()  local
198 	pr_debug("PCM data: addr %pad len %zu\n", &runtime->dma_addr,  in camelot_prepare()
199 		 runtime->dma_bytes);  in camelot_prepare()
201 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {  in camelot_prepare()
202 		BRGREG(BRGATXSAR) = (unsigned long)runtime->dma_area;  in camelot_prepare()
203 		BRGREG(BRGATXTCR) = runtime->dma_bytes;  in camelot_prepare()
205 		BRGREG(BRGARXDAR) = (unsigned long)runtime->dma_area;  in camelot_prepare()
206 		BRGREG(BRGARXTCR) = runtime->dma_bytes;  in camelot_prepare()
212 static inline void dmabrg_play_dma_start(struct camelot_pcm *cam)  in dmabrg_play_dma_start()  argument
215 	/* start DMABRG engine: XFER start, auto-addr-reload */  in dmabrg_play_dma_start()
219 static inline void dmabrg_play_dma_stop(struct camelot_pcm *cam)  in dmabrg_play_dma_stop()  argument
226 static inline void dmabrg_rec_dma_start(struct camelot_pcm *cam)  in dmabrg_rec_dma_start()  argument
229 	/* start DMABRG engine: recv start, auto-reload */  in dmabrg_rec_dma_start()
233 static inline void dmabrg_rec_dma_stop(struct camelot_pcm *cam)  in dmabrg_rec_dma_stop()  argument
244 	struct camelot_pcm *cam = &cam_pcm_data[snd_soc_rtd_to_cpu(rtd, 0)->id];  in camelot_trigger()  local
245 	int recv = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 0:1;  in camelot_trigger()
249 		if (recv)  in camelot_trigger()
250 			dmabrg_rec_dma_start(cam);  in camelot_trigger()
252 			dmabrg_play_dma_start(cam);  in camelot_trigger()
255 		if (recv)  in camelot_trigger()
256 			dmabrg_rec_dma_stop(cam);  in camelot_trigger()
258 			dmabrg_play_dma_stop(cam);  in camelot_trigger()
261 		return -EINVAL;  in camelot_trigger()
270 	struct snd_pcm_runtime *runtime = substream->runtime;  in camelot_pos()
272 	struct camelot_pcm *cam = &cam_pcm_data[snd_soc_rtd_to_cpu(rtd, 0)->id];  in camelot_pos()  local
273 	int recv = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 0:1;  in camelot_pos()
280 	 * fast-playback sound in my test application (ScummVM)  in camelot_pos()
282 	if (recv)  in camelot_pos()
283 		pos = cam->rx_period ? cam->rx_period_size : 0;  in camelot_pos()
285 		pos = cam->tx_period ? cam->tx_period_size : 0;  in camelot_pos()
293 	struct snd_pcm *pcm = rtd->pcm;  in camelot_pcm_new()
296 	 * in MMAP mode (i.e. aplay -M)  in camelot_pcm_new()
318 	return devm_snd_soc_register_component(&pdev->dev, &sh7760_soc_component,  in sh7760_soc_platform_probe()
324 			.name = "sh7760-pcm-audio",