2 * sound/arm/omap-alsa-dma.c
4 * Common audio DMA handling for the OMAP processors
6 * Copyright (C) 2005 Instituto Nokia de Tecnologia - INdT - Manaus Brazil
8 * Copyright (C) 2004 Texas Instruments, Inc.
10 * Copyright (C) 2000, 2001 Nicolas Pitre <nico@cam.org>
12 * This package is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 as
14 * published by the Free Software Foundation.
16 * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
18 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
22 * 2004-06-07 Sriram Kannan - Created new file from omap_audio_dma_intfc.c. This file
23 * will contain only the DMA interface and buffer handling of OMAP
26 * 2004-06-22 Sriram Kannan - removed legacy code (auto-init). Self-linking of DMA logical channel.
28 * 2004-08-12 Nishanth Menon - Modified to integrate Audio requirements on 1610,1710 platforms
30 * 2004-11-01 Nishanth Menon - 16xx platform code base modified to support multi channel chaining.
32 * 2004-12-15 Nishanth Menon - Improved 16xx platform channel logic introduced - tasklets, queue handling updated
34 * 2005-07-19 INdT Kernel Team - Alsa port. Creation of new file omap-alsa-dma.c based in
35 * omap-audio-dma-intfc.c oss file. Support for aic23 codec.
36 * Removal of buffer handling (Alsa does that), modifications
37 * in dma handling and port to alsa structures.
39 * 2005-12-18 Dirk Behme - Added L/R Channel Interchange fix as proposed by Ajaya Babu
42 #include <linux/config.h>
43 #include <linux/module.h>
44 #include <linux/init.h>
45 #include <linux/types.h>
48 #include <linux/slab.h>
49 #include <linux/sched.h>
50 #include <linux/poll.h>
52 #include <linux/errno.h>
53 #include <linux/sound.h>
54 #include <linux/soundcard.h>
55 #include <linux/sysrq.h>
56 #include <linux/interrupt.h>
57 #include <linux/dma-mapping.h>
59 #include <asm/uaccess.h>
61 #include <asm/hardware.h>
62 #include <asm/semaphore.h>
64 #include <asm/arch/dma.h>
65 #include "omap-alsa-dma.h"
67 #include <asm/arch/mcbsp.h>
69 #include "omap-aic23.h"
74 #define DPRINTK(ARGS...) printk(KERN_INFO "<%s>: ",__FUNCTION__);printk(ARGS)
75 #define FN_IN printk(KERN_INFO "[%s]: start\n", __FUNCTION__)
76 #define FN_OUT(n) printk(KERN_INFO "[%s]: end(%u)\n",__FUNCTION__, n)
79 #define DPRINTK( x... )
84 #define ERR(ARGS...) printk(KERN_ERR "{%s}-ERROR: ", __FUNCTION__);printk(ARGS);
86 /* Channel Queue Handling macros
87 * tail always points to the current free entry
88 * Head always points to the current entry being used
89 * end is either head or tail
92 #define AUDIO_QUEUE_INIT(s) s->dma_q_head = s->dma_q_tail = s->dma_q_count = 0;
93 #define AUDIO_QUEUE_FULL(s) (nr_linked_channels == s->dma_q_count)
94 #define AUDIO_QUEUE_LAST(s) (1 == s->dma_q_count)
95 #define AUDIO_QUEUE_EMPTY(s) (0 == s->dma_q_count)
96 #define __AUDIO_INCREMENT_QUEUE(end) ((end)=((end)+1) % nr_linked_channels)
97 #define AUDIO_INCREMENT_HEAD(s) __AUDIO_INCREMENT_QUEUE(s->dma_q_head); s->dma_q_count--;
98 #define AUDIO_INCREMENT_TAIL(s) __AUDIO_INCREMENT_QUEUE(s->dma_q_tail); s->dma_q_count++;
100 /* DMA buffer fragmentation sizes */
101 #define MAX_DMA_SIZE 0x1000000 /* todo: sync with alsa */
102 //#define CUT_DMA_SIZE 0x1000
103 /* TODO: To be moved to more appropriate location */
104 #define DCSR_ERROR 0x3
105 #define DCSR_END_BLOCK (1 << 5)
106 #define DCSR_SYNC_SET (1 << 6)
108 #define DCCR_FS (1 << 5)
109 #define DCCR_PRIO (1 << 6)
110 #define DCCR_EN (1 << 7)
111 #define DCCR_AI (1 << 8)
112 #define DCCR_REPEAT (1 << 9)
113 /* if 0 the channel works in 3.1 compatible mode*/
114 #define DCCR_N31COMP (1 << 10)
115 #define DCCR_EP (1 << 11)
116 #define DCCR_SRC_AMODE_BIT 12
117 #define DCCR_SRC_AMODE_MASK (0x3<<12)
118 #define DCCR_DST_AMODE_BIT 14
119 #define DCCR_DST_AMODE_MASK (0x3<<14)
120 #define AMODE_CONST 0x0
121 #define AMODE_POST_INC 0x1
122 #define AMODE_SINGLE_INDEX 0x2
123 #define AMODE_DOUBLE_INDEX 0x3
125 /**************************** DATA STRUCTURES *****************************************/
127 static spinlock_t dma_list_lock = SPIN_LOCK_UNLOCKED;
129 static char nr_linked_channels = 1;
131 /*********************************** MODULE SPECIFIC FUNCTIONS ***********************/
133 static void sound_dma_irq_handler(int lch, u16 ch_status, void *data);
134 static int audio_set_dma_params_play(int channel, dma_addr_t dma_ptr,
136 static int audio_set_dma_params_capture(int channel, dma_addr_t dma_ptr,
138 static int audio_start_dma_chain(struct audio_stream * s);
140 /***************************************************************************************
142 * DMA channel requests
144 **************************************************************************************/
145 static void omap_sound_dma_link_lch(void *data)
148 struct audio_stream *s = (struct audio_stream *) data;
157 for (i = 0; i < nr_linked_channels; i++) {
158 int cur_chan = chan[i];
160 ((nr_linked_channels - 1 ==
161 i) ? chan[0] : chan[i + 1]);
162 omap_dma_link_lch(cur_chan, nex_chan);
168 int omap_request_sound_dma(int device_id, const char *device_name,
169 void *data, int **channels)
174 if (unlikely((NULL == channels) || (NULL == device_name))) {
178 /* Try allocate memory for the num channels */
180 (int *) kmalloc(sizeof(int) * nr_linked_channels, GFP_KERNEL);
183 ERR("No Memory for channel allocs!\n");
187 spin_lock(&dma_list_lock);
188 for (i = 0; i < nr_linked_channels; i++) {
190 omap_request_dma(device_id, device_name,
191 sound_dma_irq_handler, data,
194 /* Handle Failure condition here */
197 for (j = 0; j < i; j++) {
198 omap_free_dma(chan[j]);
200 spin_unlock(&dma_list_lock);
203 ERR("Error in requesting channel %d=0x%x\n", i,
210 /* Chain the channels together */
211 if (!cpu_is_omap1510())
212 omap_sound_dma_link_lch(data);
214 spin_unlock(&dma_list_lock);
219 /***************************************************************************************
221 * DMA channel requests Freeing
223 **************************************************************************************/
224 static void omap_sound_dma_unlink_lch(void *data)
226 struct audio_stream *s = (struct audio_stream *) data;
235 for (i = 0; i < nr_linked_channels; i++) {
236 int cur_chan = chan[i];
238 ((nr_linked_channels - 1 ==
239 i) ? chan[0] : chan[i + 1]);
240 omap_dma_unlink_lch(cur_chan, nex_chan);
246 int omap_free_sound_dma(void *data, int **channels)
252 if (unlikely(NULL == channels)) {
256 if (unlikely(NULL == *channels)) {
262 if (!cpu_is_omap1510())
263 omap_sound_dma_unlink_lch(data);
264 for (i = 0; i < nr_linked_channels; i++) {
265 int cur_chan = chan[i];
266 omap_stop_dma(cur_chan);
267 omap_free_dma(cur_chan);
275 /***************************************************************************************
277 * Stop all the DMA channels of the stream
279 **************************************************************************************/
280 void omap_audio_stop_dma(struct audio_stream *s)
285 if (unlikely(NULL == chan)) {
289 for (i = 0; i < nr_linked_channels; i++) {
290 int cur_chan = chan[i];
291 omap_stop_dma(cur_chan);
297 /***************************************************************************************
299 * Clear any pending transfers
301 **************************************************************************************/
302 void omap_clear_sound_dma(struct audio_stream * s)
305 omap_clear_dma(s->lch[s->dma_q_head]);
310 /*********************************** MODULE FUNCTIONS DEFINTIONS ***********************/
312 #ifdef OMAP1610_MCBSP1_BASE
313 #undef OMAP1610_MCBSP1_BASE
315 #define OMAP1610_MCBSP1_BASE 0xE1011000
317 /***************************************************************************************
319 * DMA related functions
321 **************************************************************************************/
322 static int audio_set_dma_params_play(int channel, dma_addr_t dma_ptr,
325 int dt = 0x1; /* data type 16 */
326 int cen = 32; /* Stereo */
327 int cfn = dma_size / (2 * cen);
329 omap_set_dma_dest_params(channel, 0x05, 0x00,
330 (OMAP1610_MCBSP1_BASE + 0x806),
332 omap_set_dma_src_params(channel, 0x00, 0x01, dma_ptr,
334 omap_set_dma_transfer_params(channel, dt, cen, cfn, 0x00, 0, 0);
339 static int audio_set_dma_params_capture(int channel, dma_addr_t dma_ptr,
342 int dt = 0x1; /* data type 16 */
343 int cen = 32; /* stereo */
345 int cfn = dma_size / (2 * cen);
347 omap_set_dma_src_params(channel, 0x05, 0x00,
348 (OMAP1610_MCBSP1_BASE + 0x802),
350 omap_set_dma_dest_params(channel, 0x00, 0x01, dma_ptr, 0, 0);
351 omap_set_dma_transfer_params(channel, dt, cen, cfn, 0x00, 0, 0);
356 static int audio_start_dma_chain(struct audio_stream *s)
358 int channel = s->lch[s->dma_q_head];
361 s->hw_stop(); /* stops McBSP Interface */
362 omap_start_dma(channel);
364 s->hw_start(); /* start McBSP interface */
366 /* else the dma itself will progress forward with out our help */
372 * Do the initial set of work to initialize all the channels as required.
373 * We shall then initate a transfer
375 int omap_start_sound_dma(struct audio_stream *s, dma_addr_t dma_ptr,
382 if (unlikely(dma_size > MAX_DMA_SIZE)) {
383 ERR("DmaSoundDma: Start: overflowed %d-%d\n", dma_size,
387 //if (AUDIO_QUEUE_FULL(s)) {
392 if (s->stream_id == SNDRV_PCM_STREAM_PLAYBACK) {
395 audio_set_dma_params_play(s->lch[s->dma_q_tail],
399 audio_set_dma_params_capture(s->lch[s->dma_q_tail],
403 ret = -3; /* indicate queue full */
406 AUDIO_INCREMENT_TAIL(s);
407 ret = audio_start_dma_chain(s);
409 ERR("dma start failed");
418 * ISRs have to be short and smart..
419 * Here we call alsa handling, after some error checking
421 static void sound_dma_irq_handler(int sound_curr_lch, u16 ch_status,
424 int dma_status = ch_status;
425 struct audio_stream *s = (struct audio_stream *) data;
429 * some register checkings
431 DPRINTK("lch=%d,status=0x%x, dma_status=%d, data=%p\n",
432 sound_curr_lch, ch_status, dma_status, data);
434 if (dma_status & (DCSR_ERROR)) {
435 OMAP_DMA_CCR_REG(sound_curr_lch) &= ~DCCR_EN;
436 ERR("DCSR_ERROR!\n");
441 if (ch_status & DCSR_END_BLOCK)
442 audio_dma_callback(s);
447 MODULE_AUTHOR("Texas Instruments");
449 ("Common DMA handling for Audio driver on OMAP processors");
450 MODULE_LICENSE("GPL");
452 EXPORT_SYMBOL(omap_start_sound_dma);
453 EXPORT_SYMBOL(omap_clear_sound_dma);
454 EXPORT_SYMBOL(omap_request_sound_dma);
455 EXPORT_SYMBOL(omap_free_sound_dma);
456 EXPORT_SYMBOL(omap_audio_stop_dma);