loongson: Alsa memory maps fixup on mips systems

From 491b2522226c4d8f4abfdced9c0371a8521ea1e1 Mon Sep 17 00:00:00 2001
From: Wu Zhangjin <[email protected]>
Date: Sat, 16 May 2009 04:56:32 +0800
Subject: [PATCH 27/30] loongson: Alsa memory maps fixup on mips systems

The user application mmap audio dma regions must be dma-coherent

---
 sound/core/pcm_native.c |    9 +++++++++
 sound/core/sgbuf.c      |    8 ++++++++
 sound/pci/Kconfig       |    1 -
 3 files changed, 17 insertions(+), 1 deletions(-)

index a789efc..438dd80 100644
@@ -3099,7 +3099,11 @@ static int snd_pcm_mmap_data_fault(struct

vm_area_struct *area,
return VM_FAULT_SIGBUS;
} else {
vaddr = runtime->dma_area + offset;
+#if defined(__mips__) && defined(CONFIG_DMA_NONCOHERENT)
+ page = virt_to_page(CAC_ADDR(vaddr));
+#else
page = virt_to_page(vaddr);
+#endif
}
get_page(page);
vmf->page = page;
@@ -3214,6 +3218,11 @@ static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
if (PCM_RUNTIME_CHECK(substream))
return -ENXIO;

+#if defined(__mips__) && defined(CONFIG_DMA_NONCOHERENT)
+ /* all mmap using uncached mode */
+ area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
+ area->vm_flags |= ( VM_RESERVED | VM_IO);
+#endif
offset = area->vm_pgoff << PAGE_SHIFT; switch (offset) {
case SNDRV_PCM_MMAP_OFFSET_STATUS:

index 4e7ec2b..977e9ce 100644
@@ -114,7 +114,11 @@ void *snd_malloc_sgbuf_pages(struct device *device,
 			if (!i)
 				table->addr |= chunk; /* mark head */
 			table++;
+#if defined(__mips__) && defined(CONFIG_DMA_NONCOHERENT)
+			*pgtable++ = virt_to_page(CAC_ADDR(tmpb.area));
+#else
 			*pgtable++ = virt_to_page(tmpb.area);
+#endif
 			tmpb.area += PAGE_SIZE;
 			tmpb.addr += PAGE_SIZE;
 		}

@@ -125,7 +129,11 @@ void *snd_malloc_sgbuf_pages(struct device *device,
 	}
 
 	sgbuf->size = size;
+#if defined(__mips__) && defined(CONFIG_DMA_NONCOHERENT)
+	dmab->area = vmap(sgbuf->page_table, sgbuf->pages, VM_MAP | VM_IO,

pgprot_noncached(PAGE_KERNEL));
+#else
dmab->area = vmap(sgbuf->page_table, sgbuf->pages, VM_MAP,
PAGE_KERNEL);
+#endif
if (! dmab->area)
goto _failed;
if (res_size)

index 82b9bdd..4ccfae0 100644
@@ -259,7 +259,6 @@ config SND_CS5530
 
 config SND_CS5535AUDIO
 	tristate "CS5535/CS5536 Audio"
-	depends on X86 && !X86_64
 	select SND_PCM
 	select SND_AC97_CODEC
 	help

1.6.2.1