Changeset 0ea8f83 in mainline

Timestamp:

2011-11-11T19:44:07Z (13 years ago)

Author:

Jan Vesely <jano.vesely@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

d98d136

Parents:

751d17a2

Message:

sb16: DMA buffer uses separate memory area.

Location:

uspace/drv/audio/sb16

Files:

• dma.h (modified) (1 diff)
• dsp.c (modified) (5 diffs)

uspace/drv/audio/sb16/dma.h

@@ -65 +65 @@
  * @return Address of the aligned and big enough memory place, NULL on failure.
  */
-static inline void * malloc24(size_t size)
+static inline void *dma_create_buffer24(size_t size)
 {
-        /* This works only reliably when the host has less than 16MB of memory
-         * as physical address needs to fit into 24 bits */
-
-        /* If we need more than one page there is no guarantee that the
-         * memory will be continuous */
-        if (size > PAGE_SIZE)
+        void *free_address = as_get_mappable_page(size);
+        if (free_address == 0)
                 return NULL;
-        return memalign(DMA_ALIGNENT, size);
+        void *address =
+            as_area_create(free_address, size, AS_AREA_READ | AS_AREA_WRITE);
+        if (address != free_address)
+                return NULL;
+        bzero(address, size);
+        return address;
 }
 /*----------------------------------------------------------------------------*/
 /** DMA mallocator simulator
  *
- * @param[in] addr Address of the place allocated by malloc24
+ * @param[in] addr Address of the place allocated by dma_create_buffer24
  */
-static inline void free24(void *addr)
-        { free(addr); }
+static inline void dma_destroy_buffer(void *page)
+{
+        if (page)
+                as_area_destroy(page);
+}
+
 
 #endif

uspace/drv/audio/sb16/dsp.c

@@ -43 +43 @@
 #include "dsp.h"
 
-#define BUFFER_SIZE (PAGE_SIZE / 4)
+#define BUFFER_SIZE (PAGE_SIZE)
 #define PLAY_BLOCK_SIZE (BUFFER_SIZE / 2)
 
@@ -108 +108 @@
 {
         assert(dsp);
-        uint8_t *buffer = malloc24(BUFFER_SIZE);
+        uint8_t *buffer = dma_create_buffer24(BUFFER_SIZE);
         if (buffer == NULL) {
                 ddf_log_error("Failed to allocate buffer.\n");
@@ -118 +118 @@
         /* Set 16 bit channel */
         const int ret = dma_setup_channel(SB_DMA_CHAN_16, pa, BUFFER_SIZE,
-            DMA_MODE_READ | DMA_MODE_AUTO | DMA_MODE_SINGLE);
+            DMA_MODE_READ | DMA_MODE_AUTO | DMA_MODE_ON_DEMAND);
         if (ret == EOK) {
                 dsp->buffer.data = buffer;
@@ -127 +127 @@
                 ddf_log_error("Failed to setup DMA16 channel %s.\n",
                     str_error(ret));
-                free24(buffer);
+                dma_destroy_buffer(buffer);
         }
         return ret;
@@ -134 +134 @@
 static inline void sb_clear_buffer(sb_dsp_t *dsp)
 {
-        free24(dsp->buffer.data);
+        dma_destroy_buffer(dsp->buffer.data);
         dsp->buffer.data = NULL;
         dsp->buffer.position = NULL;