* Copyright (C) 2006 Mika Laitio <lamikr@cc.jyu.fi>
*
* Copyright (C) 2005 Instituto Nokia de Tecnologia - INdT - Manaus Brazil
- *
+ *
* Copyright (C) 2004 Texas Instruments, Inc.
*
* Copyright (C) 2000, 2001 Nicolas Pitre <nico@cam.org>
*
* History:
*
- * 2004-06-07 Sriram Kannan - Created new file from omap_audio_dma_intfc.c. This file
- * will contain only the DMA interface and buffer handling of OMAP
- * audio driver.
+ * 2004-06-07 Sriram Kannan - Created new file from omap_audio_dma_intfc.c.
+ * This file will contain only the DMA interface
+ * and buffer handling of OMAP audio driver.
+ *
+ * 2004-06-22 Sriram Kannan - removed legacy code (auto-init). Self-linking
+ * of DMA logical channel.
*
- * 2004-06-22 Sriram Kannan - removed legacy code (auto-init). Self-linking of DMA logical channel.
+ * 2004-08-12 Nishanth Menon - Modified to integrate Audio requirements on
+ * 1610, 1710 platforms
*
- * 2004-08-12 Nishanth Menon - Modified to integrate Audio requirements on 1610,1710 platforms
+ * 2004-11-01 Nishanth Menon - 16xx platform code base modified to support
+ * multi channel chaining.
*
- * 2004-11-01 Nishanth Menon - 16xx platform code base modified to support multi channel chaining.
+ * 2004-12-15 Nishanth Menon - Improved 16xx platform channel logic
+ * introduced - tasklets, queue handling updated
*
- * 2004-12-15 Nishanth Menon - Improved 16xx platform channel logic introduced - tasklets, queue handling updated
- *
- * 2005-07-19 INdT Kernel Team - Alsa port. Creation of new file omap-alsa-dma.c based in
- * omap-audio-dma-intfc.c oss file. Support for aic23 codec.
- * Removal of buffer handling (Alsa does that), modifications
- * in dma handling and port to alsa structures.
+ * 2005-07-19 INdT Kernel Team - Alsa port. Creation of new file
+ * omap-alsa-dma.c based in omap-audio-dma-intfc.c
+ * oss file. Support for aic23 codec. Removal of
+ * buffer handling (Alsa does that), modifications
+ * in dma handling and port to alsa structures.
*
- * 2005-12-18 Dirk Behme - Added L/R Channel Interchange fix as proposed by Ajaya Babu
+ * 2005-12-18 Dirk Behme - Added L/R Channel Interchange fix as proposed
+ * by Ajaya Babu
*/
#include <linux/module.h>
#include <linux/sysrq.h>
#include <linux/interrupt.h>
#include <linux/dma-mapping.h>
+#include <linux/io.h>
+#include <linux/uaccess.h>
-#include <asm/uaccess.h>
-#include <asm/io.h>
#include <asm/hardware.h>
#include <asm/semaphore.h>
-
#include <asm/arch/dma.h>
-#include "omap-alsa-dma.h"
-
#include <asm/arch/mcbsp.h>
-
#include <asm/arch/omap-alsa.h>
-#undef DEBUG
+#include "omap-alsa-dma.h"
-#define ERR(ARGS...) printk(KERN_ERR "{%s}-ERROR: ", __FUNCTION__);printk(ARGS);
+#undef DEBUG
-/* Channel Queue Handling macros
+/*
+ * Channel Queue Handling macros
* tail always points to the current free entry
* Head always points to the current entry being used
* end is either head or tail
#define AUDIO_QUEUE_FULL(s) (nr_linked_channels == s->dma_q_count)
#define AUDIO_QUEUE_LAST(s) (1 == s->dma_q_count)
#define AUDIO_QUEUE_EMPTY(s) (0 == s->dma_q_count)
-#define __AUDIO_INCREMENT_QUEUE(end) ((end)=((end)+1) % nr_linked_channels)
-#define AUDIO_INCREMENT_HEAD(s) __AUDIO_INCREMENT_QUEUE(s->dma_q_head); s->dma_q_count--;
-#define AUDIO_INCREMENT_TAIL(s) __AUDIO_INCREMENT_QUEUE(s->dma_q_tail); s->dma_q_count++;
+#define __AUDIO_INCREMENT_QUEUE(end) ((end) = ((end)+1) % nr_linked_channels)
+#define AUDIO_INCREMENT_HEAD(s) \
+ do { \
+ __AUDIO_INCREMENT_QUEUE(s->dma_q_head); \
+ s->dma_q_count--; \
+ } while (0)
+#define AUDIO_INCREMENT_TAIL(s) \
+ do { \
+ __AUDIO_INCREMENT_QUEUE(s->dma_q_tail); \
+ s->dma_q_count++; \
+ } while (0)
/* DMA buffer fragmentation sizes */
#define MAX_DMA_SIZE 0x1000000 /* todo: sync with alsa */
-//#define CUT_DMA_SIZE 0x1000
+/* #define CUT_DMA_SIZE 0x1000 */
/* TODO: To be moved to more appropriate location */
#define DCSR_ERROR 0x3
#define DCSR_END_BLOCK (1 << 5)
#define DCCR_EN (1 << 7)
#define DCCR_AI (1 << 8)
#define DCCR_REPEAT (1 << 9)
-/* if 0 the channel works in 3.1 compatible mode*/
+/* if 0 the channel works in 3.1 compatible mode */
#define DCCR_N31COMP (1 << 10)
#define DCCR_EP (1 << 11)
#define DCCR_SRC_AMODE_BIT 12
#define AMODE_SINGLE_INDEX 0x2
#define AMODE_DOUBLE_INDEX 0x3
-/**************************** DATA STRUCTURES *****************************************/
-
-static spinlock_t dma_list_lock = SPIN_LOCK_UNLOCKED;
-
+/* Data structures */
+DEFINE_SPINLOCK(dma_list_lock);
static char nr_linked_channels = 1;
-/*********************************** MODULE SPECIFIC FUNCTIONS ***********************/
+/* Module specific functions */
static void sound_dma_irq_handler(int lch, u16 ch_status, void *data);
static int audio_set_dma_params_play(int channel, dma_addr_t dma_ptr,
u_int dma_size);
static int audio_set_dma_params_capture(int channel, dma_addr_t dma_ptr,
u_int dma_size);
-static int audio_start_dma_chain(struct audio_stream * s);
+static int audio_start_dma_chain(struct audio_stream *s);
-/***************************************************************************************
- *
+/*
* DMA channel requests
- *
- **************************************************************************************/
+ */
static void omap_sound_dma_link_lch(void *data)
{
return -EPERM;
}
/* Try allocate memory for the num channels */
- *channels =
- (int *) kmalloc(sizeof(int) * nr_linked_channels, GFP_KERNEL);
+ *channels = kmalloc(sizeof(int) * nr_linked_channels, GFP_KERNEL);
chan = *channels;
if (NULL == chan) {
ERR("No Memory for channel allocs!\n");
}
spin_lock(&dma_list_lock);
for (i = 0; i < nr_linked_channels; i++) {
- err = omap_request_dma(device_id,
+ err = omap_request_dma(device_id,
device_name,
- sound_dma_irq_handler,
+ sound_dma_irq_handler,
data,
&chan[i]);
/* Handle Failure condition here */
if (err < 0) {
int j;
- for (j = 0; j < i; j++) {
+
+ for (j = 0; j < i; j++)
omap_free_dma(chan[j]);
- }
+
spin_unlock(&dma_list_lock);
kfree(chan);
*channels = NULL;
FN_OUT(0);
return 0;
}
+EXPORT_SYMBOL(omap_request_alsa_sound_dma);
-/***************************************************************************************
- *
+/*
* DMA channel requests Freeing
- *
- **************************************************************************************/
+ */
static void omap_sound_dma_unlink_lch(void *data)
{
struct audio_stream *s = (struct audio_stream *)data;
{
int i;
int *chan = NULL;
-
+
FN_IN;
if (unlikely(NULL == channels)) {
BUG();
FN_OUT(0);
return 0;
}
+EXPORT_SYMBOL(omap_free_alsa_sound_dma);
-/***************************************************************************************
- *
+/*
* Stop all the DMA channels of the stream
- *
- **************************************************************************************/
+ */
void omap_stop_alsa_sound_dma(struct audio_stream *s)
{
int *chan = s->lch;
int i;
-
+
FN_IN;
if (unlikely(NULL == chan)) {
BUG();
FN_OUT(0);
return;
}
-/***************************************************************************************
- *
+EXPORT_SYMBOL(omap_stop_alsa_sound_dma);
+
+/*
* Clear any pending transfers
- *
- **************************************************************************************/
-void omap_clear_alsa_sound_dma(struct audio_stream * s)
+ */
+void omap_clear_alsa_sound_dma(struct audio_stream *s)
{
FN_IN;
omap_clear_dma(s->lch[s->dma_q_head]);
FN_OUT(0);
return;
}
+EXPORT_SYMBOL(omap_clear_alsa_sound_dma);
-/***************************************************************************************
- *
+/*
* DMA related functions
- *
- **************************************************************************************/
+ */
static int audio_set_dma_params_play(int channel, dma_addr_t dma_ptr,
u_int dma_size)
{
int dt = 0x1; /* data type 16 */
int cen = 32; /* Stereo */
int cfn = dma_size / (2 * cen);
-
+
FN_IN;
omap_set_dma_dest_params(channel, 0x05, 0x00,
(OMAP1510_MCBSP1_BASE + 0x06),
int dt = 0x1; /* data type 16 */
int cen = 32; /* stereo */
int cfn = dma_size / (2 * cen);
-
+
FN_IN;
omap_set_dma_src_params(channel, 0x05, 0x00,
(OMAP1510_MCBSP1_BASE + 0x02),
int channel = s->lch[s->dma_q_head];
FN_IN;
if (!s->started) {
- s->hw_stop(); /* stops McBSP Interface */
+ s->hw_stop(); /* stops McBSP Interface */
omap_start_dma(channel);
s->started = 1;
s->hw_start(); /* start McBSP interface */
return 0;
}
-/* Start DMA -
+/*
+ * Start DMA -
* Do the initial set of work to initialize all the channels as required.
* We shall then initate a transfer
*/
-int omap_start_alsa_sound_dma(struct audio_stream *s,
- dma_addr_t dma_ptr,
+int omap_start_alsa_sound_dma(struct audio_stream *s,
+ dma_addr_t dma_ptr,
u_int dma_size)
{
int ret = -EPERM;
MAX_DMA_SIZE);
return -EOVERFLOW;
}
- //if (AUDIO_QUEUE_FULL(s)) {
- // ret = -2;
- // goto sound_out;
- //}
if (s->stream_id == SNDRV_PCM_STREAM_PLAYBACK) {
- /*playback */
+ /* playback */
ret =
audio_set_dma_params_play(s->lch[s->dma_q_tail],
dma_ptr, dma_size);
}
AUDIO_INCREMENT_TAIL(s);
ret = audio_start_dma_chain(s);
- if (ret) {
+ if (ret)
ERR("dma start failed");
- }
- sound_out:
+
+sound_out:
FN_OUT(ret);
return ret;
}
+EXPORT_SYMBOL(omap_start_alsa_sound_dma);
-/*
- * ISRs have to be short and smart..
+/*
+ * ISRs have to be short and smart..
* Here we call alsa handling, after some error checking
*/
static void sound_dma_irq_handler(int sound_curr_lch, u16 ch_status,
struct audio_stream *s = (struct audio_stream *) data;
FN_IN;
- /*
- * some register checkings
- */
+ /* some register checking */
DPRINTK("lch=%d,status=0x%x, dma_status=%d, data=%p\n",
sound_curr_lch, ch_status, dma_status, data);
return;
}
- if (ch_status & DCSR_END_BLOCK)
+ if (ch_status & DCSR_END_BLOCK)
callback_omap_alsa_sound_dma(s);
FN_OUT(0);
return;
MODULE_DESCRIPTION("Common DMA handling for Audio driver on OMAP processors");
MODULE_LICENSE("GPL");
-EXPORT_SYMBOL(omap_start_alsa_sound_dma);
-EXPORT_SYMBOL(omap_clear_alsa_sound_dma);
-EXPORT_SYMBOL(omap_request_alsa_sound_dma);
-EXPORT_SYMBOL(omap_free_alsa_sound_dma);
-EXPORT_SYMBOL(omap_stop_alsa_sound_dma);
projects / linux-2.6-omap-h63xx.git / commitdiff