at91: add kernel support for sama7g5 soc

Add kernel support for SAMA7G5 by back-porting mainline kernel patches.
Among SAMA7G5 features could be remembered:
- ARM Cortex-A7
- double data rate multi-port dynamic RAM controller supporting DDR2,
  DDR3, DDR3L, LPDDR2, LPDDR3 up to 533MHz
- peripherals for audio, video processing
- 1 gigabit + 1 megabit Ethernet controllers
- 6 CAN controllers
- trust zone support
- DVFS for CPU
- criptography IPs

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>

1 files changed, 140 insertions, 0 deletions

diff --git a/target/linux/at91/patches-5.10/144-ASoC-atmel-pdc-Use-managed-DMA-buffer-allocation.patch b/target/linux/at91/patches-5.10/144-ASoC-atmel-pdc-Use-managed-DMA-buffer-allocation.patch
new file mode 100644
index 0000000000..1cb43ca20c
--- /dev/null
+++ b/target/linux/at91/patches-5.10/144-ASoC-atmel-pdc-Use-managed-DMA-buffer-allocation.patch
@@ -0,0 +1,140 @@
+From 0b20c174a17dcfa805ddac1301a5af7298877ec3 Mon Sep 17 00:00:00 2001
+From: Lars-Peter Clausen <lars@metafoo.de>
+Date: Wed, 6 Jan 2021 14:36:48 +0100
+Subject: [PATCH 144/247] ASoC: atmel-pdc: Use managed DMA buffer allocation
+
+Instead of manually managing its DMA buffers using
+dma_{alloc,free}_coherent() lets the sound core take care of this using
+managed buffers.
+
+On one hand this reduces the amount of boiler plate code, but the main
+motivation for the change is to use the shared code where possible. This
+makes it easier to argue about correctness and that the code does not
+contain subtle bugs like data leakage or similar.
+
+Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
+Reviewed-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
+Link: https://lore.kernel.org/r/20210106133650.13509-1-lars@metafoo.de
+Signed-off-by: Mark Brown <broonie@kernel.org>
+---
+ sound/soc/atmel/atmel-pcm-pdc.c | 78 ++-------------------------------
+ 1 file changed, 4 insertions(+), 74 deletions(-)
+
+diff --git a/sound/soc/atmel/atmel-pcm-pdc.c b/sound/soc/atmel/atmel-pcm-pdc.c
+index 704f700013d3..3e7ea2021b46 100644
+--- a/sound/soc/atmel/atmel-pcm-pdc.c
++++ b/sound/soc/atmel/atmel-pcm-pdc.c
+@@ -34,86 +34,21 @@
+ #include "atmel-pcm.h"
+ 
+ 
+-static int atmel_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
+-	int stream)
+-{
+-	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
+-	struct snd_dma_buffer *buf = &substream->dma_buffer;
+-	size_t size = ATMEL_SSC_DMABUF_SIZE;
+-
+-	buf->dev.type = SNDRV_DMA_TYPE_DEV;
+-	buf->dev.dev = pcm->card->dev;
+-	buf->private_data = NULL;
+-	buf->area = dma_alloc_coherent(pcm->card->dev, size,
+-			&buf->addr, GFP_KERNEL);
+-	pr_debug("atmel-pcm: alloc dma buffer: area=%p, addr=%p, size=%zu\n",
+-			(void *)buf->area, (void *)(long)buf->addr, size);
+-
+-	if (!buf->area)
+-		return -ENOMEM;
+-
+-	buf->bytes = size;
+-	return 0;
+-}
+-
+-static int atmel_pcm_mmap(struct snd_soc_component *component,
+-			  struct snd_pcm_substream *substream,
+-			  struct vm_area_struct *vma)
+-{
+-	return remap_pfn_range(vma, vma->vm_start,
+-		       substream->dma_buffer.addr >> PAGE_SHIFT,
+-		       vma->vm_end - vma->vm_start, vma->vm_page_prot);
+-}
+-
+ static int atmel_pcm_new(struct snd_soc_component *component,
+ 			 struct snd_soc_pcm_runtime *rtd)
+ {
+ 	struct snd_card *card = rtd->card->snd_card;
+-	struct snd_pcm *pcm = rtd->pcm;
+ 	int ret;
+ 
+ 	ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
+ 	if (ret)
+ 		return ret;
+ 
+-	if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
+-		pr_debug("atmel-pcm: allocating PCM playback DMA buffer\n");
+-		ret = atmel_pcm_preallocate_dma_buffer(pcm,
+-			SNDRV_PCM_STREAM_PLAYBACK);
+-		if (ret)
+-			goto out;
+-	}
++	snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_DEV,
++				       card->dev, ATMEL_SSC_DMABUF_SIZE,
++				       ATMEL_SSC_DMABUF_SIZE);
+ 
+-	if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
+-		pr_debug("atmel-pcm: allocating PCM capture DMA buffer\n");
+-		ret = atmel_pcm_preallocate_dma_buffer(pcm,
+-			SNDRV_PCM_STREAM_CAPTURE);
+-		if (ret)
+-			goto out;
+-	}
+- out:
+-	return ret;
+-}
+-
+-static void atmel_pcm_free(struct snd_soc_component *component,
+-			   struct snd_pcm *pcm)
+-{
+-	struct snd_pcm_substream *substream;
+-	struct snd_dma_buffer *buf;
+-	int stream;
+-
+-	for (stream = 0; stream < 2; stream++) {
+-		substream = pcm->streams[stream].substream;
+-		if (!substream)
+-			continue;
+-
+-		buf = &substream->dma_buffer;
+-		if (!buf->area)
+-			continue;
+-		dma_free_coherent(pcm->card->dev, buf->bytes,
+-				  buf->area, buf->addr);
+-		buf->area = NULL;
+-	}
++	return 0;
+ }
+ 
+ /*--------------------------------------------------------------------------*\
+@@ -210,9 +145,6 @@ static int atmel_pcm_hw_params(struct snd_soc_component *component,
+ 	/* this may get called several times by oss emulation
+ 	 * with different params */
+ 
+-	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
+-	runtime->dma_bytes = params_buffer_bytes(params);
+-
+ 	prtd->params = snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), substream);
+ 	prtd->params->dma_intr_handler = atmel_pcm_dma_irq;
+ 
+@@ -384,9 +316,7 @@ static const struct snd_soc_component_driver atmel_soc_platform = {
+ 	.prepare	= atmel_pcm_prepare,
+ 	.trigger	= atmel_pcm_trigger,
+ 	.pointer	= atmel_pcm_pointer,
+-	.mmap		= atmel_pcm_mmap,
+ 	.pcm_construct	= atmel_pcm_new,
+-	.pcm_destruct	= atmel_pcm_free,
+ };
+ 
+ int atmel_pcm_pdc_platform_register(struct device *dev)
+-- 
+2.32.0
+