cardwo.c

是关于linux2.5.1的完全源码

/*
 **********************************************************************
 *     cardwo.c - PCM output HAL for emu10k1 driver
 *     Copyright 1999, 2000 Creative Labs, Inc.
 *
 **********************************************************************
 *
 *     Date                 Author          Summary of changes
 *     ----                 ------          ------------------
 *     October 20, 1999     Bertrand Lee    base code release
 *
 **********************************************************************
 *
 *     This program is free software; you can redistribute it and/or
 *     modify it under the terms of the GNU General Public License as
 *     published by the Free Software Foundation; either version 2 of
 *     the License, or (at your option) any later version.
 *
 *     This program is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *     GNU General Public License for more details.
 *
 *     You should have received a copy of the GNU General Public
 *     License along with this program; if not, write to the Free
 *     Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139,
 *     USA.
 *
 **********************************************************************
 */

#include <linux/poll.h>
#include "hwaccess.h"
#include "8010.h"
#include "voicemgr.h"
#include "cardwo.h"
#include "audio.h"

static u32 samplerate_to_linearpitch(u32 samplingrate)
{
	samplingrate = (samplingrate << 8) / 375;
	return (samplingrate >> 1) + (samplingrate & 1);
}

static void query_format(struct emu10k1_wavedevice *wave_dev, struct wave_format *wave_fmt)
{
	int i, j, do_passthrough = 0, is_ac3 = 0;
	struct emu10k1_card *card = wave_dev->card;
	struct woinst *woinst = wave_dev->woinst;

	if ((wave_fmt->channels > 2) && (wave_fmt->id != AFMT_S16_LE) && (wave_fmt->id != AFMT_U8))
		wave_fmt->channels = 2;

	if ((wave_fmt->channels < 1) || (wave_fmt->channels > WAVEOUT_MAXVOICES))
		wave_fmt->channels = 2;

	if (wave_fmt->channels == 2)
		woinst->num_voices = 1;
	else
		woinst->num_voices = wave_fmt->channels;

	if (wave_fmt->samplingrate >= 0x2ee00)
		wave_fmt->samplingrate = 0x2ee00;

	wave_fmt->passthrough = 0;
	do_passthrough = is_ac3 = 0;

	if (card->pt.selected)
		do_passthrough = 1;

	switch (wave_fmt->id) {
	case AFMT_S16_LE:
		wave_fmt->bitsperchannel = 16;
		break;
	case AFMT_U8:
		wave_fmt->bitsperchannel = 8;
		break;
	case AFMT_AC3:
		do_passthrough = 1;
		is_ac3 = 1;
		break;
	default:
		wave_fmt->id = AFMT_S16_LE;
		wave_fmt->bitsperchannel = 16;
		break;
	}	
	if (do_passthrough) {
		i = emu10k1_find_control_gpr(&card->mgr, card->pt.patch_name, card->pt.intr_gpr_name);
		j = emu10k1_find_control_gpr(&card->mgr, card->pt.patch_name, card->pt.enable_gpr_name);
		/* currently only one waveout instance may use pass-through */
		if (i < 0 || j < 0 || woinst->state != WAVE_STATE_CLOSED || 
		    card->pt.state != PT_STATE_INACTIVE ||
		    (wave_fmt->samplingrate != 48000 && !is_ac3) ||
		    (wave_fmt->samplingrate != 48000 && !is_ac3)) {
			DPF(2, "unable to set pass-through mode\n");
		} else {
			wave_fmt->samplingrate = 48000;
			wave_fmt->channels = 2;
			wave_fmt->passthrough = 1;
			card->pt.intr_gpr = i;
			card->pt.enable_gpr = j;
			card->pt.state = PT_STATE_INACTIVE;
			card->pt.pos_gpr = emu10k1_find_control_gpr(&card->mgr, card->pt.patch_name, card->pt.pos_gpr_name);
			DPD(2, "is_ac3 is %d\n", is_ac3);
			card->pt.ac3data = is_ac3;
	                wave_fmt->bitsperchannel = 16;
		}
	}

	wave_fmt->bytesperchannel = wave_fmt->bitsperchannel >> 3;

	if (wave_fmt->channels == 2)
		wave_fmt->bytespervoicesample = wave_fmt->channels * wave_fmt->bytesperchannel;
	else
		wave_fmt->bytespervoicesample = wave_fmt->bytesperchannel;

	wave_fmt->bytespersample = wave_fmt->channels * wave_fmt->bytesperchannel;
	wave_fmt->bytespersec = wave_fmt->bytespersample * wave_fmt->samplingrate;
}

/**
 * alloc_buffer -
 *
 * allocates the memory buffer for a voice. Two page tables are kept for each buffer.
 * One (dma_handle) keeps track of the host memory pages used and the other (virtualpagetable)
 * is passed to the device so that it can do DMA to host memory. 
 *
 */
static int alloc_buffer(struct emu10k1_card *card, struct waveout_buffer *buffer, unsigned int voicenum)
{
	u32 pageindex, pagecount;
	unsigned long busaddx;
	int i;

	DPD(2, "requested pages is: %d\n", buffer->pages);

	if ((buffer->mem[voicenum].emupageindex =
	 emu10k1_addxmgr_alloc(buffer->pages * PAGE_SIZE, card)) < 0)
		return -1;

	/* Fill in virtual memory table */
	for (pagecount = 0; pagecount < buffer->pages; pagecount++) {
		if ((buffer->mem[voicenum].addr[pagecount] =
		 pci_alloc_consistent(card->pci_dev, PAGE_SIZE,
		 &buffer->mem[voicenum].dma_handle[pagecount])) == NULL) {
			buffer->pages = pagecount;
			return -1;
		}

		DPD(2, "Virtual Addx: %p\n", buffer->mem[voicenum].addr[pagecount]);

		for (i = 0; i < PAGE_SIZE / EMUPAGESIZE; i++) {
			busaddx = buffer->mem[voicenum].dma_handle[pagecount] + i * EMUPAGESIZE;

			DPD(3, "Bus Addx: %#lx\n", busaddx);

			pageindex = buffer->mem[voicenum].emupageindex + pagecount * PAGE_SIZE / EMUPAGESIZE + i;

			((u32 *) card->virtualpagetable.addr)[pageindex] = cpu_to_le32((busaddx * 2) | pageindex);
		}
	}

	return 0;
}

/**
 * free_buffer -
 *
 * frees the memory buffer for a voice.
 */
static void free_buffer(struct emu10k1_card *card, struct waveout_buffer *buffer, unsigned int voicenum)
{
	u32 pagecount, pageindex;
	int i;

	if (buffer->mem[voicenum].emupageindex < 0)
		return;

	for (pagecount = 0; pagecount < buffer->pages; pagecount++) {
		pci_free_consistent(card->pci_dev, PAGE_SIZE,
		 buffer->mem[voicenum].addr[pagecount],
		 buffer->mem[voicenum].dma_handle[pagecount]);

		for (i = 0; i < PAGE_SIZE / EMUPAGESIZE; i++) {
			pageindex = buffer->mem[voicenum].emupageindex + pagecount * PAGE_SIZE / EMUPAGESIZE + i;
			((u32 *) card->virtualpagetable.addr)[pageindex] =
			 cpu_to_le32((card->silentpage.dma_handle * 2) | pageindex);
		}
	}

	emu10k1_addxmgr_free(card, buffer->mem[voicenum].emupageindex);
	buffer->mem[voicenum].emupageindex = -1;
}

static int get_voice(struct emu10k1_card *card, struct woinst *woinst, unsigned int voicenum)
{
	struct emu_voice *voice = &woinst->voice[voicenum];
	/* Allocate voices here, if no voices available, return error.
	 * Init voice_allocdesc first.*/

	voice->usage = VOICE_USAGE_PLAYBACK;

	voice->flags = 0;

	if (woinst->format.channels == 2)
		voice->flags |= VOICE_FLAGS_STEREO;

	if (woinst->format.bitsperchannel == 16)
		voice->flags |= VOICE_FLAGS_16BIT;

	if (emu10k1_voice_alloc(card, voice) < 0) {
		voice->usage = VOICE_USAGE_FREE;
		return -1;
	}

	/* Calculate pitch */
	voice->initial_pitch = (u16) (srToPitch(woinst->format.samplingrate) >> 8);
	voice->pitch_target = samplerate_to_linearpitch(woinst->format.samplingrate);

	DPD(2, "Initial pitch --> %#x\n", voice->initial_pitch);

	voice->startloop = (woinst->buffer.mem[voicenum].emupageindex << 12) /
	 woinst->format.bytespervoicesample;
	voice->endloop = voice->startloop + woinst->buffer.size / woinst->format.bytespervoicesample;
	voice->start = voice->startloop;

	if (voice->flags & VOICE_FLAGS_STEREO) {
		voice->params[0].send_a = card->waveout.send_a[1];
		voice->params[0].send_b = card->waveout.send_b[1];
		voice->params[0].send_c = card->waveout.send_c[1];
		voice->params[0].send_d = card->waveout.send_d[1];

		if (woinst->device)
			voice->params[0].send_routing = 0x7654;
		else
			voice->params[0].send_routing = card->waveout.send_routing[1];

		voice->params[0].volume_target = 0xffff;
		voice->params[0].initial_fc = 0xff;
		voice->params[0].initial_attn = 0x00;
		voice->params[0].byampl_env_sustain = 0x7f;
		voice->params[0].byampl_env_decay = 0x7f;

		voice->params[1].send_a = card->waveout.send_a[2];
		voice->params[1].send_b = card->waveout.send_b[2];
		voice->params[1].send_c = card->waveout.send_c[2];
		voice->params[1].send_d = card->waveout.send_d[2];

		if (woinst->device)
			voice->params[1].send_routing = 0x7654;
		else
			voice->params[1].send_routing = card->waveout.send_routing[2];

		voice->params[1].volume_target = 0xffff;
		voice->params[1].initial_fc = 0xff;
		voice->params[1].initial_attn = 0x00;
		voice->params[1].byampl_env_sustain = 0x7f;
		voice->params[1].byampl_env_decay = 0x7f;
	} else {
		if (woinst->num_voices > 1) {
			voice->params[0].send_a = 0xff;
			voice->params[0].send_b = 0;
			voice->params[0].send_c = 0;
			voice->params[0].send_d = 0;

			voice->params[0].send_routing =
			 0xfff0 + card->mchannel_fx + voicenum;
		} else {
			voice->params[0].send_a = card->waveout.send_a[0];
			voice->params[0].send_b = card->waveout.send_b[0];
			voice->params[0].send_c = card->waveout.send_c[0];
			voice->params[0].send_d = card->waveout.send_d[0];

			if (woinst->device)
				voice->params[0].send_routing = 0x7654;
			else
				voice->params[0].send_routing = card->waveout.send_routing[0];
		}	

		voice->params[0].volume_target = 0xffff;
		voice->params[0].initial_fc = 0xff;
		voice->params[0].initial_attn = 0x00;
		voice->params[0].byampl_env_sustain = 0x7f;
		voice->params[0].byampl_env_decay = 0x7f;
	}

	DPD(2, "voice: startloop=%#x, endloop=%#x\n", voice->startloop, voice->endloop);

	emu10k1_voice_playback_setup(voice);

	return 0;
}

int emu10k1_waveout_open(struct emu10k1_wavedevice *wave_dev)
{
	struct emu10k1_card *card = wave_dev->card;
	struct woinst *woinst = wave_dev->woinst;
	struct waveout_buffer *buffer = &woinst->buffer;
	unsigned int voicenum;
	u32 delay;

	DPF(2, "emu10k1_waveout_open()\n");

	for (voicenum = 0; voicenum < woinst->num_voices; voicenum++) {
		if (alloc_buffer(card, buffer, voicenum) < 0) {
			ERROR();
			emu10k1_waveout_close(wave_dev);
			return -1;
		}

		if (get_voice(card, woinst, voicenum) < 0) {
			ERROR();
			emu10k1_waveout_close(wave_dev);
			return -1;
		}
	}

	buffer->fill_silence = 0;
	buffer->silence_bytes = 0;
	buffer->silence_pos = 0;
	buffer->hw_pos = 0;
	buffer->free_bytes = woinst->buffer.size;

	delay = (48000 * woinst->buffer.fragment_size) /
		 (woinst->format.samplingrate * woinst->format.bytespervoicesample);

	emu10k1_timer_install(card, &woinst->timer, delay / 2);

	woinst->state = WAVE_STATE_OPEN;

	return 0;
}

void emu10k1_waveout_close(struct emu10k1_wavedevice *wave_dev)
{
	struct emu10k1_card *card = wave_dev->card;
	struct woinst *woinst = wave_dev->woinst;
	unsigned int voicenum;

	DPF(2, "emu10k1_waveout_close()\n");

	emu10k1_waveout_stop(wave_dev);

	emu10k1_timer_uninstall(card, &woinst->timer);

	for (voicenum = 0; voicenum < woinst->num_voices; voicenum++) {
		emu10k1_voice_free(&woinst->voice[voicenum]);