cx88-alsa.c

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/*
 *
 *  Support for audio capture
 *  PCI function #1 of the cx2388x.
 *
 *    (c) 2007 Trent Piepho <[e-mail]>
 *    (c) 2005,2006 Ricardo Cerqueira <[e-mail]>
 *    (c) 2005 Mauro Carvalho Chehab <[e-mail]>
 *    Based on a dummy cx88 module by Gerd Knorr <[e-mail]>
 *    Based on dummy.c by Jaroslav Kysela <[e-mail]>
 *
 *  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/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/vmalloc.h>
#include <linux/dma-mapping.h>
#include <linux/pci.h>

#include <asm/delay.h>
#include <sound/driver.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/control.h>
#include <sound/initval.h>
#include <sound/tlv.h>

#include "cx88.h"
#include "cx88-reg.h"

#define dprintk(level,fmt, arg...)	if (debug >= level) \
	printk(KERN_INFO "%s/1: " fmt, chip->core->name , ## arg)

#define dprintk_core(level,fmt, arg...)	if (debug >= level) \
	printk(KERN_DEBUG "%s/1: " fmt, chip->core->name , ## arg)

/****************************************************************************
	Data type declarations - Can be moded to a header file later
 ****************************************************************************/

struct cx88_audio_dev {
	struct cx88_core           *core;
	struct cx88_dmaqueue       q;

	/* pci i/o */
	struct pci_dev             *pci;

	/* audio controls */
	int                        irq;

	struct snd_card            *card;

	spinlock_t                 reg_lock;
	atomic_t		   count;

	unsigned int               dma_size;
	unsigned int               period_size;
	unsigned int               num_periods;

	struct videobuf_dmabuf     *dma_risc;

	struct cx88_buffer	   *buf;

	struct snd_pcm_substream   *substream;
};
typedef struct cx88_audio_dev snd_cx88_card_t;




/****************************************************************************
			Module global static vars
 ****************************************************************************/

static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;	/* Index 0-MAX */
static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;	/* ID for this card */
static int enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 1};

module_param_array(enable, bool, NULL, 0444);
MODULE_PARM_DESC(enable, "Enable cx88x soundcard. default enabled.");

module_param_array(index, int, NULL, 0444);
MODULE_PARM_DESC(index, "Index value for cx88x capture interface(s).");


/****************************************************************************
				Module macros
 ****************************************************************************/

MODULE_DESCRIPTION("ALSA driver module for cx2388x based TV cards");
MODULE_AUTHOR("Ricardo Cerqueira");
MODULE_AUTHOR("Mauro Carvalho Chehab <[e-mail]>");
MODULE_LICENSE("GPL");
MODULE_SUPPORTED_DEVICE("{{Conexant,23881},"
			"{{Conexant,23882},"
			"{{Conexant,23883}");
static unsigned int debug;
module_param(debug,int,0644);
MODULE_PARM_DESC(debug,"enable debug messages");

/****************************************************************************
			Module specific funtions
 ****************************************************************************/

/*
 * BOARD Specific: Sets audio DMA
 */

static int _cx88_start_audio_dma(snd_cx88_card_t *chip)
{
	struct cx88_buffer   *buf = chip->buf;
	struct cx88_core *core=chip->core;
	struct sram_channel *audio_ch = &cx88_sram_channels[SRAM_CH25];

	/* Make sure RISC/FIFO are off before changing FIFO/RISC settings */
	cx_clear(MO_AUD_DMACNTRL, 0x11);

	/* setup fifo + format - out channel */
	cx88_sram_channel_setup(chip->core, audio_ch, buf->bpl, buf->risc.dma);

	/* sets bpl size */
	cx_write(MO_AUDD_LNGTH, buf->bpl);

	/* reset counter */
	cx_write(MO_AUDD_GPCNTRL, GP_COUNT_CONTROL_RESET);
	atomic_set(&chip->count, 0);

	dprintk(1, "Start audio DMA, %d B/line, %d lines/FIFO, %d periods, %d "
		"byte buffer\n", buf->bpl, cx_read(audio_ch->cmds_start + 8)>>1,
		chip->num_periods, buf->bpl * chip->num_periods);

	/* Enables corresponding bits at AUD_INT_STAT */
	cx_write(MO_AUD_INTMSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC |
				AUD_INT_DN_RISCI2 | AUD_INT_DN_RISCI1);

	/* Clean any pending interrupt bits already set */
	cx_write(MO_AUD_INTSTAT, ~0);

	/* enable audio irqs */
	cx_set(MO_PCI_INTMSK, chip->core->pci_irqmask | PCI_INT_AUDINT);

	/* start dma */
	cx_set(MO_DEV_CNTRL2, (1<<5)); /* Enables Risc Processor */
	cx_set(MO_AUD_DMACNTRL, 0x11); /* audio downstream FIFO and RISC enable */

	if (debug)
		cx88_sram_channel_dump(chip->core, audio_ch);

	return 0;
}

/*
 * BOARD Specific: Resets audio DMA
 */
static int _cx88_stop_audio_dma(snd_cx88_card_t *chip)
{
	struct cx88_core *core=chip->core;
	dprintk(1, "Stopping audio DMA\n");

	/* stop dma */
	cx_clear(MO_AUD_DMACNTRL, 0x11);

	/* disable irqs */
	cx_clear(MO_PCI_INTMSK, PCI_INT_AUDINT);
	cx_clear(MO_AUD_INTMSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC |
				AUD_INT_DN_RISCI2 | AUD_INT_DN_RISCI1);

	if (debug)
		cx88_sram_channel_dump(chip->core, &cx88_sram_channels[SRAM_CH25]);

	return 0;
}

#define MAX_IRQ_LOOP 50

/*
 * BOARD Specific: IRQ dma bits
 */
static char *cx88_aud_irqs[32] = {
	"dn_risci1", "up_risci1", "rds_dn_risc1", /* 0-2 */
	NULL,					  /* reserved */
	"dn_risci2", "up_risci2", "rds_dn_risc2", /* 4-6 */
	NULL,					  /* reserved */
	"dnf_of", "upf_uf", "rds_dnf_uf",	  /* 8-10 */
	NULL,					  /* reserved */
	"dn_sync", "up_sync", "rds_dn_sync",	  /* 12-14 */
	NULL,					  /* reserved */
	"opc_err", "par_err", "rip_err",	  /* 16-18 */
	"pci_abort", "ber_irq", "mchg_irq"	  /* 19-21 */
};

/*
 * BOARD Specific: Threats IRQ audio specific calls
 */
static void cx8801_aud_irq(snd_cx88_card_t *chip)
{
	struct cx88_core *core = chip->core;
	u32 status, mask;

	status = cx_read(MO_AUD_INTSTAT);
	mask   = cx_read(MO_AUD_INTMSK);
	if (0 == (status & mask))
		return;
	cx_write(MO_AUD_INTSTAT, status);
	if (debug > 1  ||  (status & mask & ~0xff))
		cx88_print_irqbits(core->name, "irq aud",
				   cx88_aud_irqs, ARRAY_SIZE(cx88_aud_irqs),
				   status, mask);
	/* risc op code error */
	if (status & AUD_INT_OPC_ERR) {
		printk(KERN_WARNING "%s/1: Audio risc op code error\n",core->name);
		cx_clear(MO_AUD_DMACNTRL, 0x11);
		cx88_sram_channel_dump(core, &cx88_sram_channels[SRAM_CH25]);
	}
	if (status & AUD_INT_DN_SYNC) {
		dprintk(1, "Downstream sync error\n");
		cx_write(MO_AUDD_GPCNTRL, GP_COUNT_CONTROL_RESET);
		return;
	}
	/* risc1 downstream */
	if (status & AUD_INT_DN_RISCI1) {
		atomic_set(&chip->count, cx_read(MO_AUDD_GPCNT));
		snd_pcm_period_elapsed(chip->substream);
	}
	/* FIXME: Any other status should deserve a special handling? */
}

/*
 * BOARD Specific: Handles IRQ calls
 */
static irqreturn_t cx8801_irq(int irq, void *dev_id)
{
	snd_cx88_card_t *chip = dev_id;
	struct cx88_core *core = chip->core;
	u32 status;
	int loop, handled = 0;

	for (loop = 0; loop < MAX_IRQ_LOOP; loop++) {
		status = cx_read(MO_PCI_INTSTAT) &
			(core->pci_irqmask | PCI_INT_AUDINT);
		if (0 == status)
			goto out;
		dprintk(3, "cx8801_irq loop %d/%d, status %x\n",
			loop, MAX_IRQ_LOOP, status);
		handled = 1;
		cx_write(MO_PCI_INTSTAT, status);

		if (status & core->pci_irqmask)
			cx88_core_irq(core, status);
		if (status & PCI_INT_AUDINT)
			cx8801_aud_irq(chip);
	}

	if (MAX_IRQ_LOOP == loop) {
		printk(KERN_ERR
		       "%s/1: IRQ loop detected, disabling interrupts\n",
		       core->name);
		cx_clear(MO_PCI_INTMSK, PCI_INT_AUDINT);
	}

 out:
	return IRQ_RETVAL(handled);
}


static int dsp_buffer_free(snd_cx88_card_t *chip)
{
	BUG_ON(!chip->dma_size);

	dprintk(2,"Freeing buffer\n");
	videobuf_pci_dma_unmap(chip->pci, chip->dma_risc);
	videobuf_dma_free(chip->dma_risc);
	btcx_riscmem_free(chip->pci,&chip->buf->risc);
	kfree(chip->buf);

	chip->dma_risc = NULL;
	chip->dma_size = 0;

	return 0;
}

/****************************************************************************
				ALSA PCM Interface
 ****************************************************************************/

/*
 * Digital hardware definition
 */
#define DEFAULT_FIFO_SIZE	4096
static struct snd_pcm_hardware snd_cx88_digital_hw = {
	.info = SNDRV_PCM_INFO_MMAP |
		SNDRV_PCM_INFO_INTERLEAVED |
		SNDRV_PCM_INFO_BLOCK_TRANSFER |
		SNDRV_PCM_INFO_MMAP_VALID,
	.formats = SNDRV_PCM_FMTBIT_S16_LE,

	.rates =		SNDRV_PCM_RATE_48000,
	.rate_min =		48000,
	.rate_max =		48000,
	.channels_min = 2,
	.channels_max = 2,
	/* Analog audio output will be full of clicks and pops if there
	   are not exactly four lines in the SRAM FIFO buffer.  */
	.period_bytes_min = DEFAULT_FIFO_SIZE/4,
	.period_bytes_max = DEFAULT_FIFO_SIZE/4,
	.periods_min = 1,
	.periods_max = 1024,
	.buffer_bytes_max = (1024*1024),
};

/*
 * audio pcm capture open callback
 */
static int snd_cx88_pcm_open(struct snd_pcm_substream *substream)
{
	snd_cx88_card_t *chip = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	int err;

	err = snd_pcm_hw_constraint_pow2(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS);
	if (err < 0)
		goto _error;

	chip->substream = substream;

	runtime->hw = snd_cx88_digital_hw;

	if (cx88_sram_channels[SRAM_CH25].fifo_size != DEFAULT_FIFO_SIZE) {
		unsigned int bpl = cx88_sram_channels[SRAM_CH25].fifo_size / 4;
		bpl &= ~7; /* must be multiple of 8 */
		runtime->hw.period_bytes_min = bpl;
		runtime->hw.period_bytes_max = bpl;
	}

	return 0;
_error:
	dprintk(1,"Error opening PCM!\n");
	return err;
}

/*
 * audio close callback
 */
static int snd_cx88_close(struct snd_pcm_substream *substream)
{
	return 0;
}

/*
 * hw_params callback
 */
static int snd_cx88_hw_params(struct snd_pcm_substream * substream,
			      struct snd_pcm_hw_params * hw_params)
{
	snd_cx88_card_t *chip = snd_pcm_substream_chip(substream);
	struct videobuf_dmabuf *dma;

	struct cx88_buffer *buf;
	int ret;

	if (substream->runtime->dma_area) {
		dsp_buffer_free(chip);
		substream->runtime->dma_area = NULL;
	}

	chip->period_size = params_period_bytes(hw_params);
	chip->num_periods = params_periods(hw_params);
	chip->dma_size = chip->period_size * params_periods(hw_params);

	BUG_ON(!chip->dma_size);
	BUG_ON(chip->num_periods & (chip->num_periods-1));

	buf = videobuf_pci_alloc(sizeof(*buf));
	if (NULL == buf)
		return -ENOMEM;

	buf->vb.memory = V4L2_MEMORY_MMAP;
	buf->vb.field  = V4L2_FIELD_NONE;
	buf->vb.width  = chip->period_size;
	buf->bpl       = chip->period_size;
	buf->vb.height = chip->num_periods;
	buf->vb.size   = chip->dma_size;

	dma=videobuf_to_dma(&buf->vb);
	videobuf_dma_init(dma);
	ret = videobuf_dma_init_kernel(dma, PCI_DMA_FROMDEVICE,
			(PAGE_ALIGN(buf->vb.size) >> PAGE_SHIFT));
	if (ret < 0)
		goto error;

	ret = videobuf_pci_dma_map(chip->pci,dma);
	if (ret < 0)
		goto error;

	ret = cx88_risc_databuffer(chip->pci, &buf->risc, dma->sglist,
				   buf->vb.width, buf->vb.height, 1);
	if (ret < 0)
		goto error;

	/* Loop back to start of program */
	buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP|RISC_IRQ1|RISC_CNT_INC);
	buf->risc.jmp[1] = cpu_to_le32(buf->risc.dma);

	buf->vb.state = STATE_PREPARED;

	chip->buf = buf;
	chip->dma_risc = dma;

	substream->runtime->dma_area = chip->dma_risc->vmalloc;
	substream->runtime->dma_bytes = chip->dma_size;
	substream->runtime->dma_addr = 0;
	return 0;

error:
	kfree(buf);
	return ret;
}

/*
 * hw free callback
 */
static int snd_cx88_hw_free(struct snd_pcm_substream * substream)
{

	snd_cx88_card_t *chip = snd_pcm_substream_chip(substream);

	if (substream->runtime->dma_area) {
		dsp_buffer_free(chip);
		substream->runtime->dma_area = NULL;
	}

	return 0;
}

/*
 * prepare callback
 */
static int snd_cx88_prepare(struct snd_pcm_substream *substream)
{
	return 0;
}