1 // SPDX-License-Identifier: GPL-2.0+
3 // idma.c - I2S0 internal DMA driver
10 #include <linux/dma-mapping.h>
18 #include "idma.h"
19 #include "i2s-regs.h"
54 } idma;  variable
60 	*src = idma.lp_tx_addr +  in idma_getpos()
61 		(readl(idma.regs + I2STRNCNT) & 0xffffff) * 4;  in idma_getpos()
66 	struct snd_pcm_runtime *runtime = substream->runtime;  in idma_enqueue()
67 	struct idma_ctrl *prtd = substream->runtime->private_data;  in idma_enqueue()
70 	spin_lock(&prtd->lock);  in idma_enqueue()
71 	prtd->token = (void *) substream;  in idma_enqueue()
72 	spin_unlock(&prtd->lock);  in idma_enqueue()
75 	val = idma.lp_tx_addr + prtd->periodsz;  in idma_enqueue()
76 	writel(val, idma.regs + I2SLVL0ADDR);  in idma_enqueue()
79 	val = idma.lp_tx_addr;  in idma_enqueue()
80 	writel(val, idma.regs + I2SSTR0);  in idma_enqueue()
86 	val = readl(idma.regs + I2SSIZE);  in idma_enqueue()
88 	val |= (((runtime->dma_bytes >> 2) &  in idma_enqueue()
90 	writel(val, idma.regs + I2SSIZE);  in idma_enqueue()
92 	val = readl(idma.regs + I2SAHB);  in idma_enqueue()
94 	writel(val, idma.regs + I2SAHB);  in idma_enqueue()
102 	struct idma_ctrl *prtd = substream->runtime->private_data;  in idma_setcallbk()
104 	spin_lock(&prtd->lock);  in idma_setcallbk()
105 	prtd->cb = cb;  in idma_setcallbk()
106 	spin_unlock(&prtd->lock);  in idma_setcallbk()
111 	u32 val = readl(idma.regs + I2SAHB);  in idma_control()
113 	spin_lock(&idma.lock);  in idma_control()
123 		spin_unlock(&idma.lock);  in idma_control()
127 	writel(val, idma.regs + I2SAHB);  in idma_control()
128 	spin_unlock(&idma.lock);  in idma_control()
134 	struct idma_ctrl *prtd = substream->runtime->private_data;  in idma_done()
136 	if (prtd && (prtd->state & ST_RUNNING))  in idma_done()
144 	struct snd_pcm_runtime *runtime = substream->runtime;  in idma_hw_params()
145 	struct idma_ctrl *prtd = substream->runtime->private_data;  in idma_hw_params()
146 	u32 mod = readl(idma.regs + I2SMOD);  in idma_hw_params()
147 	u32 ahb = readl(idma.regs + I2SAHB);  in idma_hw_params()
151 	writel(ahb, idma.regs + I2SAHB);  in idma_hw_params()
152 	writel(mod, idma.regs + I2SMOD);  in idma_hw_params()
154 	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);  in idma_hw_params()
155 	runtime->dma_bytes = params_buffer_bytes(params);  in idma_hw_params()
157 	prtd->start = prtd->pos = runtime->dma_addr;  in idma_hw_params()
158 	prtd->period = params_periods(params);  in idma_hw_params()
159 	prtd->periodsz = params_period_bytes(params);  in idma_hw_params()
160 	prtd->end = runtime->dma_addr + runtime->dma_bytes;  in idma_hw_params()
178 	struct idma_ctrl *prtd = substream->runtime->private_data;  in idma_prepare()
180 	prtd->pos = prtd->start;  in idma_prepare()
192 	struct idma_ctrl *prtd = substream->runtime->private_data;  in idma_trigger()
195 	spin_lock(&prtd->lock);  in idma_trigger()
201 		prtd->state |= ST_RUNNING;  in idma_trigger()
208 		prtd->state &= ~ST_RUNNING;  in idma_trigger()
213 		ret = -EINVAL;  in idma_trigger()
217 	spin_unlock(&prtd->lock);  in idma_trigger()
226 	struct snd_pcm_runtime *runtime = substream->runtime;  in idma_pointer()
227 	struct idma_ctrl *prtd = runtime->private_data;  in idma_pointer()
231 	spin_lock(&prtd->lock);  in idma_pointer()
234 	res = src - prtd->start;  in idma_pointer()
236 	spin_unlock(&prtd->lock);  in idma_pointer()
238 	return bytes_to_frames(substream->runtime, res);  in idma_pointer()
245 	struct snd_pcm_runtime *runtime = substream->runtime;  in idma_mmap()
249 	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);  in idma_mmap()
250 	size = vma->vm_end - vma->vm_start;  in idma_mmap()
251 	offset = vma->vm_pgoff << PAGE_SHIFT;  in idma_mmap()
252 	return io_remap_pfn_range(vma, vma->vm_start,  in idma_mmap()
253 			(runtime->dma_addr + offset) >> PAGE_SHIFT,  in idma_mmap()
254 			size, vma->vm_page_prot);  in idma_mmap()
260 	u32 iisahb, val, addr;  in iis_irq()  local
262 	iisahb  = readl(idma.regs + I2SAHB);  in iis_irq()
268 		writel(iisahb, idma.regs + I2SAHB);  in iis_irq()
270 		addr = readl(idma.regs + I2SLVL0ADDR) - idma.lp_tx_addr;  in iis_irq()
271 		addr += prtd->periodsz;  in iis_irq()
272 		addr %= (u32)(prtd->end - prtd->start);  in iis_irq()
273 		addr += idma.lp_tx_addr;  in iis_irq()
275 		writel(addr, idma.regs + I2SLVL0ADDR);  in iis_irq()
277 		if (prtd->cb)  in iis_irq()
278 			prtd->cb(prtd->token, prtd->period);  in iis_irq()
287 	struct snd_pcm_runtime *runtime = substream->runtime;  in idma_open()
295 		return -ENOMEM;  in idma_open()
304 	spin_lock_init(&prtd->lock);  in idma_open()
306 	runtime->private_data = prtd;  in idma_open()
314 	struct snd_pcm_runtime *runtime = substream->runtime;  in idma_close()
315 	struct idma_ctrl *prtd = runtime->private_data;  in idma_close()
333 	substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;  in idma_free()
337 	buf = &substream->dma_buffer;  in idma_free()
338 	if (!buf->area)  in idma_free()
341 	iounmap((void __iomem *)buf->area);  in idma_free()
343 	buf->area = NULL;  in idma_free()
344 	buf->addr = 0;  in idma_free()
349 	struct snd_pcm_substream *substream = pcm->streams[stream].substream;  in preallocate_idma_buffer()
350 	struct snd_dma_buffer *buf = &substream->dma_buffer;  in preallocate_idma_buffer()
352 	buf->dev.dev = pcm->card->dev;  in preallocate_idma_buffer()
353 	buf->private_data = NULL;  in preallocate_idma_buffer()
356 	buf->dev.type = SNDRV_DMA_TYPE_CONTINUOUS;  in preallocate_idma_buffer()
357 	buf->addr = idma.lp_tx_addr;  in preallocate_idma_buffer()
358 	buf->bytes = idma_hardware.buffer_bytes_max;  in preallocate_idma_buffer()
359 	buf->area = (unsigned char * __force)ioremap(buf->addr, buf->bytes);  in preallocate_idma_buffer()
360 	if (!buf->area)  in preallocate_idma_buffer()
361 		return -ENOMEM;  in preallocate_idma_buffer()
369 	struct snd_card *card = rtd->card->snd_card;  in idma_new()
370 	struct snd_pcm *pcm = rtd->pcm;  in idma_new()
373 	ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));  in idma_new()
377 	if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {  in idma_new()
385 void idma_reg_addr_init(void __iomem *regs, dma_addr_t addr)  in idma_reg_addr_init()  argument
387 	spin_lock_init(&idma.lock);  in idma_reg_addr_init()
388 	idma.regs = regs;  in idma_reg_addr_init()
389 	idma.lp_tx_addr = addr;  in idma_reg_addr_init()
412 	return devm_snd_soc_register_component(&pdev->dev, &asoc_idma_platform,  in asoc_idma_platform_probe()
418 		.name = "samsung-idma",
427 MODULE_DESCRIPTION("Samsung ASoC IDMA Driver");