atiixp_modem.c

linux 内核源代码

/*
 *   ALSA driver for ATI IXP 150/200/250 AC97 modem controllers
 *
 *	Copyright (c) 2004 Takashi Iwai <[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., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#include <sound/driver.h>
#include <asm/io.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/moduleparam.h>
#include <linux/mutex.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/info.h>
#include <sound/ac97_codec.h>
#include <sound/initval.h>

MODULE_AUTHOR("Takashi Iwai <[e-mail]>");
MODULE_DESCRIPTION("ATI IXP MC97 controller");
MODULE_LICENSE("GPL");
MODULE_SUPPORTED_DEVICE("{{ATI,IXP150/200/250}}");

static int index = -2; /* Exclude the first card */
static char *id = SNDRV_DEFAULT_STR1;	/* ID for this card */
static int ac97_clock = 48000;

module_param(index, int, 0444);
MODULE_PARM_DESC(index, "Index value for ATI IXP controller.");
module_param(id, charp, 0444);
MODULE_PARM_DESC(id, "ID string for ATI IXP controller.");
module_param(ac97_clock, int, 0444);
MODULE_PARM_DESC(ac97_clock, "AC'97 codec clock (default 48000Hz).");

/* just for backward compatibility */
static int enable;
module_param(enable, bool, 0444);


/*
 */

#define ATI_REG_ISR			0x00	/* interrupt source */
#define  ATI_REG_ISR_MODEM_IN_XRUN	(1U<<0)
#define  ATI_REG_ISR_MODEM_IN_STATUS	(1U<<1)
#define  ATI_REG_ISR_MODEM_OUT1_XRUN	(1U<<2)
#define  ATI_REG_ISR_MODEM_OUT1_STATUS	(1U<<3)
#define  ATI_REG_ISR_MODEM_OUT2_XRUN	(1U<<4)
#define  ATI_REG_ISR_MODEM_OUT2_STATUS	(1U<<5)
#define  ATI_REG_ISR_MODEM_OUT3_XRUN	(1U<<6)
#define  ATI_REG_ISR_MODEM_OUT3_STATUS	(1U<<7)
#define  ATI_REG_ISR_PHYS_INTR		(1U<<8)
#define  ATI_REG_ISR_PHYS_MISMATCH	(1U<<9)
#define  ATI_REG_ISR_CODEC0_NOT_READY	(1U<<10)
#define  ATI_REG_ISR_CODEC1_NOT_READY	(1U<<11)
#define  ATI_REG_ISR_CODEC2_NOT_READY	(1U<<12)
#define  ATI_REG_ISR_NEW_FRAME		(1U<<13)
#define  ATI_REG_ISR_MODEM_GPIO_DATA	(1U<<14)

#define ATI_REG_IER			0x04	/* interrupt enable */
#define  ATI_REG_IER_MODEM_IN_XRUN_EN	(1U<<0)
#define  ATI_REG_IER_MODEM_STATUS_EN	(1U<<1)
#define  ATI_REG_IER_MODEM_OUT1_XRUN_EN	(1U<<2)
#define  ATI_REG_IER_MODEM_OUT2_XRUN_EN	(1U<<4)
#define  ATI_REG_IER_MODEM_OUT3_XRUN_EN	(1U<<6)
#define  ATI_REG_IER_PHYS_INTR_EN	(1U<<8)
#define  ATI_REG_IER_PHYS_MISMATCH_EN	(1U<<9)
#define  ATI_REG_IER_CODEC0_INTR_EN	(1U<<10)
#define  ATI_REG_IER_CODEC1_INTR_EN	(1U<<11)
#define  ATI_REG_IER_CODEC2_INTR_EN	(1U<<12)
#define  ATI_REG_IER_NEW_FRAME_EN	(1U<<13)	/* (RO */
#define  ATI_REG_IER_MODEM_GPIO_DATA_EN	(1U<<14)	/* (WO) modem is running */
#define  ATI_REG_IER_MODEM_SET_BUS_BUSY	(1U<<15)

#define ATI_REG_CMD			0x08	/* command */
#define  ATI_REG_CMD_POWERDOWN	(1U<<0)
#define  ATI_REG_CMD_MODEM_RECEIVE_EN	(1U<<1)	/* modem only */
#define  ATI_REG_CMD_MODEM_SEND1_EN	(1U<<2)	/* modem only */
#define  ATI_REG_CMD_MODEM_SEND2_EN	(1U<<3)	/* modem only */
#define  ATI_REG_CMD_MODEM_SEND3_EN	(1U<<4)	/* modem only */
#define  ATI_REG_CMD_MODEM_STATUS_MEM	(1U<<5)	/* modem only */
#define  ATI_REG_CMD_MODEM_IN_DMA_EN	(1U<<8)	/* modem only */
#define  ATI_REG_CMD_MODEM_OUT_DMA1_EN	(1U<<9)	/* modem only */
#define  ATI_REG_CMD_MODEM_OUT_DMA2_EN	(1U<<10)	/* modem only */
#define  ATI_REG_CMD_MODEM_OUT_DMA3_EN	(1U<<11)	/* modem only */
#define  ATI_REG_CMD_AUDIO_PRESENT	(1U<<20)
#define  ATI_REG_CMD_MODEM_GPIO_THRU_DMA	(1U<<22)	/* modem only */
#define  ATI_REG_CMD_LOOPBACK_EN	(1U<<23)
#define  ATI_REG_CMD_PACKED_DIS		(1U<<24)
#define  ATI_REG_CMD_BURST_EN		(1U<<25)
#define  ATI_REG_CMD_PANIC_EN		(1U<<26)
#define  ATI_REG_CMD_MODEM_PRESENT	(1U<<27)
#define  ATI_REG_CMD_ACLINK_ACTIVE	(1U<<28)
#define  ATI_REG_CMD_AC_SOFT_RESET	(1U<<29)
#define  ATI_REG_CMD_AC_SYNC		(1U<<30)
#define  ATI_REG_CMD_AC_RESET		(1U<<31)

#define ATI_REG_PHYS_OUT_ADDR		0x0c
#define  ATI_REG_PHYS_OUT_CODEC_MASK	(3U<<0)
#define  ATI_REG_PHYS_OUT_RW		(1U<<2)
#define  ATI_REG_PHYS_OUT_ADDR_EN	(1U<<8)
#define  ATI_REG_PHYS_OUT_ADDR_SHIFT	9
#define  ATI_REG_PHYS_OUT_DATA_SHIFT	16

#define ATI_REG_PHYS_IN_ADDR		0x10
#define  ATI_REG_PHYS_IN_READ_FLAG	(1U<<8)
#define  ATI_REG_PHYS_IN_ADDR_SHIFT	9
#define  ATI_REG_PHYS_IN_DATA_SHIFT	16

#define ATI_REG_SLOTREQ			0x14

#define ATI_REG_COUNTER			0x18
#define  ATI_REG_COUNTER_SLOT		(3U<<0)	/* slot # */
#define  ATI_REG_COUNTER_BITCLOCK	(31U<<8)

#define ATI_REG_IN_FIFO_THRESHOLD	0x1c

#define ATI_REG_MODEM_IN_DMA_LINKPTR	0x20
#define ATI_REG_MODEM_IN_DMA_DT_START	0x24	/* RO */
#define ATI_REG_MODEM_IN_DMA_DT_NEXT	0x28	/* RO */
#define ATI_REG_MODEM_IN_DMA_DT_CUR	0x2c	/* RO */
#define ATI_REG_MODEM_IN_DMA_DT_SIZE	0x30
#define ATI_REG_MODEM_OUT_FIFO		0x34	/* output threshold */
#define  ATI_REG_MODEM_OUT1_DMA_THRESHOLD_MASK	(0xf<<16)
#define  ATI_REG_MODEM_OUT1_DMA_THRESHOLD_SHIFT	16
#define ATI_REG_MODEM_OUT_DMA1_LINKPTR	0x38
#define ATI_REG_MODEM_OUT_DMA2_LINKPTR	0x3c
#define ATI_REG_MODEM_OUT_DMA3_LINKPTR	0x40
#define ATI_REG_MODEM_OUT_DMA1_DT_START	0x44
#define ATI_REG_MODEM_OUT_DMA1_DT_NEXT	0x48
#define ATI_REG_MODEM_OUT_DMA1_DT_CUR	0x4c
#define ATI_REG_MODEM_OUT_DMA2_DT_START	0x50
#define ATI_REG_MODEM_OUT_DMA2_DT_NEXT	0x54
#define ATI_REG_MODEM_OUT_DMA2_DT_CUR	0x58
#define ATI_REG_MODEM_OUT_DMA3_DT_START	0x5c
#define ATI_REG_MODEM_OUT_DMA3_DT_NEXT	0x60
#define ATI_REG_MODEM_OUT_DMA3_DT_CUR	0x64
#define ATI_REG_MODEM_OUT_DMA12_DT_SIZE	0x68
#define ATI_REG_MODEM_OUT_DMA3_DT_SIZE	0x6c
#define ATI_REG_MODEM_OUT_FIFO_USED     0x70
#define ATI_REG_MODEM_OUT_GPIO		0x74
#define  ATI_REG_MODEM_OUT_GPIO_EN	   1
#define  ATI_REG_MODEM_OUT_GPIO_DATA_SHIFT 5
#define ATI_REG_MODEM_IN_GPIO		0x78

#define ATI_REG_MODEM_MIRROR		0x7c
#define ATI_REG_AUDIO_MIRROR		0x80

#define ATI_REG_MODEM_FIFO_FLUSH	0x88
#define  ATI_REG_MODEM_FIFO_OUT1_FLUSH	(1U<<0)
#define  ATI_REG_MODEM_FIFO_OUT2_FLUSH	(1U<<1)
#define  ATI_REG_MODEM_FIFO_OUT3_FLUSH	(1U<<2)
#define  ATI_REG_MODEM_FIFO_IN_FLUSH	(1U<<3)

/* LINKPTR */
#define  ATI_REG_LINKPTR_EN		(1U<<0)

#define ATI_MAX_DESCRIPTORS	256	/* max number of descriptor packets */


struct atiixp_modem;

/*
 * DMA packate descriptor
 */

struct atiixp_dma_desc {
	u32 addr;	/* DMA buffer address */
	u16 status;	/* status bits */
	u16 size;	/* size of the packet in dwords */
	u32 next;	/* address of the next packet descriptor */
};

/*
 * stream enum
 */
enum { ATI_DMA_PLAYBACK, ATI_DMA_CAPTURE, NUM_ATI_DMAS }; /* DMAs */
enum { ATI_PCM_OUT, ATI_PCM_IN, NUM_ATI_PCMS }; /* AC97 pcm slots */
enum { ATI_PCMDEV_ANALOG, NUM_ATI_PCMDEVS }; /* pcm devices */

#define NUM_ATI_CODECS	3


/*
 * constants and callbacks for each DMA type
 */
struct atiixp_dma_ops {
	int type;			/* ATI_DMA_XXX */
	unsigned int llp_offset;	/* LINKPTR offset */
	unsigned int dt_cur;		/* DT_CUR offset */
	/* called from open callback */
	void (*enable_dma)(struct atiixp_modem *chip, int on);
	/* called from trigger (START/STOP) */
	void (*enable_transfer)(struct atiixp_modem *chip, int on);
 	/* called from trigger (STOP only) */
	void (*flush_dma)(struct atiixp_modem *chip);
};

/*
 * DMA stream
 */
struct atiixp_dma {
	const struct atiixp_dma_ops *ops;
	struct snd_dma_buffer desc_buf;
	struct snd_pcm_substream *substream;	/* assigned PCM substream */
	unsigned int buf_addr, buf_bytes;	/* DMA buffer address, bytes */
	unsigned int period_bytes, periods;
	int opened;
	int running;
	int pcm_open_flag;
	int ac97_pcm_type;	/* index # of ac97_pcm to access, -1 = not used */
};

/*
 * ATI IXP chip
 */
struct atiixp_modem {
	struct snd_card *card;
	struct pci_dev *pci;

	struct resource *res;		/* memory i/o */
	unsigned long addr;
	void __iomem *remap_addr;
	int irq;
	
	struct snd_ac97_bus *ac97_bus;
	struct snd_ac97 *ac97[NUM_ATI_CODECS];

	spinlock_t reg_lock;

	struct atiixp_dma dmas[NUM_ATI_DMAS];
	struct ac97_pcm *pcms[NUM_ATI_PCMS];
	struct snd_pcm *pcmdevs[NUM_ATI_PCMDEVS];

	int max_channels;		/* max. channels for PCM out */

	unsigned int codec_not_ready_bits;	/* for codec detection */

	int spdif_over_aclink;		/* passed from the module option */
	struct mutex open_mutex;	/* playback open mutex */
};


/*
 */
static struct pci_device_id snd_atiixp_ids[] = {
	{ 0x1002, 0x434d, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 }, /* SB200 */
	{ 0x1002, 0x4378, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 }, /* SB400 */
	{ 0, }
};

MODULE_DEVICE_TABLE(pci, snd_atiixp_ids);


/*
 * lowlevel functions
 */

/*
 * update the bits of the given register.
 * return 1 if the bits changed.
 */
static int snd_atiixp_update_bits(struct atiixp_modem *chip, unsigned int reg,
				  unsigned int mask, unsigned int value)
{
	void __iomem *addr = chip->remap_addr + reg;
	unsigned int data, old_data;
	old_data = data = readl(addr);
	data &= ~mask;
	data |= value;
	if (old_data == data)
		return 0;
	writel(data, addr);
	return 1;
}

/*
 * macros for easy use
 */
#define atiixp_write(chip,reg,value) \
	writel(value, chip->remap_addr + ATI_REG_##reg)
#define atiixp_read(chip,reg) \
	readl(chip->remap_addr + ATI_REG_##reg)
#define atiixp_update(chip,reg,mask,val) \
	snd_atiixp_update_bits(chip, ATI_REG_##reg, mask, val)

/*
 * handling DMA packets
 *
 * we allocate a linear buffer for the DMA, and split it to  each packet.
 * in a future version, a scatter-gather buffer should be implemented.
 */

#define ATI_DESC_LIST_SIZE \
	PAGE_ALIGN(ATI_MAX_DESCRIPTORS * sizeof(struct atiixp_dma_desc))

/*
 * build packets ring for the given buffer size.
 *
 * IXP handles the buffer descriptors, which are connected as a linked
 * list.  although we can change the list dynamically, in this version,
 * a static RING of buffer descriptors is used.
 *
 * the ring is built in this function, and is set up to the hardware. 
 */
static int atiixp_build_dma_packets(struct atiixp_modem *chip,
				    struct atiixp_dma *dma,
				    struct snd_pcm_substream *substream,
				    unsigned int periods,
				    unsigned int period_bytes)
{
	unsigned int i;
	u32 addr, desc_addr;
	unsigned long flags;

	if (periods > ATI_MAX_DESCRIPTORS)
		return -ENOMEM;

	if (dma->desc_buf.area == NULL) {
		if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, snd_dma_pci_data(chip->pci),
					ATI_DESC_LIST_SIZE, &dma->desc_buf) < 0)
			return -ENOMEM;
		dma->period_bytes = dma->periods = 0; /* clear */
	}

	if (dma->periods == periods && dma->period_bytes == period_bytes)
		return 0;

	/* reset DMA before changing the descriptor table */
	spin_lock_irqsave(&chip->reg_lock, flags);
	writel(0, chip->remap_addr + dma->ops->llp_offset);
	dma->ops->enable_dma(chip, 0);
	dma->ops->enable_dma(chip, 1);
	spin_unlock_irqrestore(&chip->reg_lock, flags);

	/* fill the entries */
	addr = (u32)substream->runtime->dma_addr;
	desc_addr = (u32)dma->desc_buf.addr;
	for (i = 0; i < periods; i++) {
		struct atiixp_dma_desc *desc;
		desc = &((struct atiixp_dma_desc *)dma->desc_buf.area)[i];
		desc->addr = cpu_to_le32(addr);
		desc->status = 0;
		desc->size = period_bytes >> 2; /* in dwords */
		desc_addr += sizeof(struct atiixp_dma_desc);
		if (i == periods - 1)
			desc->next = cpu_to_le32((u32)dma->desc_buf.addr);
		else
			desc->next = cpu_to_le32(desc_addr);
		addr += period_bytes;
	}

	writel((u32)dma->desc_buf.addr | ATI_REG_LINKPTR_EN,
	       chip->remap_addr + dma->ops->llp_offset);

	dma->period_bytes = period_bytes;
	dma->periods = periods;

	return 0;
}

/*
 * remove the ring buffer and release it if assigned
 */
static void atiixp_clear_dma_packets(struct atiixp_modem *chip,
				     struct atiixp_dma *dma,
				     struct snd_pcm_substream *substream)
{
	if (dma->desc_buf.area) {
		writel(0, chip->remap_addr + dma->ops->llp_offset);
		snd_dma_free_pages(&dma->desc_buf);
		dma->desc_buf.area = NULL;
	}
}

/*
 * AC97 interface
 */
static int snd_atiixp_acquire_codec(struct atiixp_modem *chip)
{
	int timeout = 1000;

	while (atiixp_read(chip, PHYS_OUT_ADDR) & ATI_REG_PHYS_OUT_ADDR_EN) {
		if (! timeout--) {
			snd_printk(KERN_WARNING "atiixp-modem: codec acquire timeout\n");
			return -EBUSY;
		}
		udelay(1);
	}
	return 0;
}

static unsigned short snd_atiixp_codec_read(struct atiixp_modem *chip,
					    unsigned short codec,
					    unsigned short reg)
{
	unsigned int data;
	int timeout;

	if (snd_atiixp_acquire_codec(chip) < 0)
		return 0xffff;
	data = (reg << ATI_REG_PHYS_OUT_ADDR_SHIFT) |
		ATI_REG_PHYS_OUT_ADDR_EN |
		ATI_REG_PHYS_OUT_RW |
		codec;
	atiixp_write(chip, PHYS_OUT_ADDR, data);
	if (snd_atiixp_acquire_codec(chip) < 0)
		return 0xffff;
	timeout = 1000;
	do {
		data = atiixp_read(chip, PHYS_IN_ADDR);
		if (data & ATI_REG_PHYS_IN_READ_FLAG)
			return data >> ATI_REG_PHYS_IN_DATA_SHIFT;
		udelay(1);
	} while (--timeout);
	/* time out may happen during reset */
	if (reg < 0x7c)
		snd_printk(KERN_WARNING "atiixp-modem: codec read timeout (reg %x)\n", reg);
	return 0xffff;
}


static void snd_atiixp_codec_write(struct atiixp_modem *chip,
				   unsigned short codec,
				   unsigned short reg, unsigned short val)
{
	unsigned int data;
    
	if (snd_atiixp_acquire_codec(chip) < 0)
		return;
	data = ((unsigned int)val << ATI_REG_PHYS_OUT_DATA_SHIFT) |
		((unsigned int)reg << ATI_REG_PHYS_OUT_ADDR_SHIFT) |
		ATI_REG_PHYS_OUT_ADDR_EN | codec;