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linux/sound/pci/via82xx_modem.c
Pierre-Louis Bossart 86a5d9cfbb ALSA: pci/via82xx: remove 'set but not used' warnings 
Fix W=1 warnings. Mark variables as __always_unused.

sound/pci/via82xx.c: In function ‘snd_via82xx_codec_wait’:
sound/pci/via82xx.c:547:6: warning: variable ‘err’ set but not used
[-Wunused-but-set-variable]
  547 |  int err;
      |      ^~~
sound/pci/via82xx_modem.c: In function ‘snd_via82xx_codec_wait’:
sound/pci/via82xx_modem.c:401:6: warning: variable ‘err’ set but not
used [-Wunused-but-set-variable]
  401 |  int err;
      |      ^~~

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20200702193604.169059-21-pierre-louis.bossart@linux.intel.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2020-07-07 12:12:38 +02:00

1205 lines
33 KiB
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* ALSA modem driver for VIA VT82xx (South Bridge)
*
* VT82C686A/B/C, VT8233A/C, VT8235
*
* Copyright (c) 2000 Jaroslav Kysela <perex@perex.cz>
* Tjeerd.Mulder <Tjeerd.Mulder@fujitsu-siemens.com>
* 2002 Takashi Iwai <tiwai@suse.de>
*/
/*
* Changes:
*
* Sep. 2, 2004 Sasha Khapyorsky <sashak@alsa-project.org>
* Modified from original audio driver 'via82xx.c' to support AC97
* modems.
*/
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/module.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>
#if 0
#define POINTER_DEBUG
#endif
MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
MODULE_DESCRIPTION("VIA VT82xx modem");
MODULE_LICENSE("GPL");
MODULE_SUPPORTED_DEVICE("{{VIA,VT82C686A/B/C modem,pci}}");
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 VIA 82xx bridge.");
module_param(id, charp, 0444);
MODULE_PARM_DESC(id, "ID string for VIA 82xx bridge.");
module_param(ac97_clock, int, 0444);
MODULE_PARM_DESC(ac97_clock, "AC'97 codec clock (default 48000Hz).");
/* just for backward compatibility */
static bool enable;
module_param(enable, bool, 0444);
/*
* Direct registers
*/
#define VIAREG(via, x) ((via)->port + VIA_REG_##x)
#define VIADEV_REG(viadev, x) ((viadev)->port + VIA_REG_##x)
/* common offsets */
#define VIA_REG_OFFSET_STATUS 0x00 /* byte - channel status */
#define VIA_REG_STAT_ACTIVE 0x80 /* RO */
#define VIA_REG_STAT_PAUSED 0x40 /* RO */
#define VIA_REG_STAT_TRIGGER_QUEUED 0x08 /* RO */
#define VIA_REG_STAT_STOPPED 0x04 /* RWC */
#define VIA_REG_STAT_EOL 0x02 /* RWC */
#define VIA_REG_STAT_FLAG 0x01 /* RWC */
#define VIA_REG_OFFSET_CONTROL 0x01 /* byte - channel control */
#define VIA_REG_CTRL_START 0x80 /* WO */
#define VIA_REG_CTRL_TERMINATE 0x40 /* WO */
#define VIA_REG_CTRL_AUTOSTART 0x20
#define VIA_REG_CTRL_PAUSE 0x08 /* RW */
#define VIA_REG_CTRL_INT_STOP 0x04
#define VIA_REG_CTRL_INT_EOL 0x02
#define VIA_REG_CTRL_INT_FLAG 0x01
#define VIA_REG_CTRL_RESET 0x01 /* RW - probably reset? undocumented */
#define VIA_REG_CTRL_INT (VIA_REG_CTRL_INT_FLAG | VIA_REG_CTRL_INT_EOL | VIA_REG_CTRL_AUTOSTART)
#define VIA_REG_OFFSET_TYPE 0x02 /* byte - channel type (686 only) */
#define VIA_REG_TYPE_AUTOSTART 0x80 /* RW - autostart at EOL */
#define VIA_REG_TYPE_16BIT 0x20 /* RW */
#define VIA_REG_TYPE_STEREO 0x10 /* RW */
#define VIA_REG_TYPE_INT_LLINE 0x00
#define VIA_REG_TYPE_INT_LSAMPLE 0x04
#define VIA_REG_TYPE_INT_LESSONE 0x08
#define VIA_REG_TYPE_INT_MASK 0x0c
#define VIA_REG_TYPE_INT_EOL 0x02
#define VIA_REG_TYPE_INT_FLAG 0x01
#define VIA_REG_OFFSET_TABLE_PTR 0x04 /* dword - channel table pointer */
#define VIA_REG_OFFSET_CURR_PTR 0x04 /* dword - channel current pointer */
#define VIA_REG_OFFSET_STOP_IDX 0x08 /* dword - stop index, channel type, sample rate */
#define VIA_REG_OFFSET_CURR_COUNT 0x0c /* dword - channel current count (24 bit) */
#define VIA_REG_OFFSET_CURR_INDEX 0x0f /* byte - channel current index (for via8233 only) */
#define DEFINE_VIA_REGSET(name,val) \
enum {\
VIA_REG_##name##_STATUS = (val),\
VIA_REG_##name##_CONTROL = (val) + 0x01,\
VIA_REG_##name##_TYPE = (val) + 0x02,\
VIA_REG_##name##_TABLE_PTR = (val) + 0x04,\
VIA_REG_##name##_CURR_PTR = (val) + 0x04,\
VIA_REG_##name##_STOP_IDX = (val) + 0x08,\
VIA_REG_##name##_CURR_COUNT = (val) + 0x0c,\
}
/* modem block */
DEFINE_VIA_REGSET(MO, 0x40);
DEFINE_VIA_REGSET(MI, 0x50);
/* AC'97 */
#define VIA_REG_AC97 0x80 /* dword */
#define VIA_REG_AC97_CODEC_ID_MASK (3<<30)
#define VIA_REG_AC97_CODEC_ID_SHIFT 30
#define VIA_REG_AC97_CODEC_ID_PRIMARY 0x00
#define VIA_REG_AC97_CODEC_ID_SECONDARY 0x01
#define VIA_REG_AC97_SECONDARY_VALID (1<<27)
#define VIA_REG_AC97_PRIMARY_VALID (1<<25)
#define VIA_REG_AC97_BUSY (1<<24)
#define VIA_REG_AC97_READ (1<<23)
#define VIA_REG_AC97_CMD_SHIFT 16
#define VIA_REG_AC97_CMD_MASK 0x7e
#define VIA_REG_AC97_DATA_SHIFT 0
#define VIA_REG_AC97_DATA_MASK 0xffff
#define VIA_REG_SGD_SHADOW 0x84 /* dword */
#define VIA_REG_SGD_STAT_PB_FLAG (1<<0)
#define VIA_REG_SGD_STAT_CP_FLAG (1<<1)
#define VIA_REG_SGD_STAT_FM_FLAG (1<<2)
#define VIA_REG_SGD_STAT_PB_EOL (1<<4)
#define VIA_REG_SGD_STAT_CP_EOL (1<<5)
#define VIA_REG_SGD_STAT_FM_EOL (1<<6)
#define VIA_REG_SGD_STAT_PB_STOP (1<<8)
#define VIA_REG_SGD_STAT_CP_STOP (1<<9)
#define VIA_REG_SGD_STAT_FM_STOP (1<<10)
#define VIA_REG_SGD_STAT_PB_ACTIVE (1<<12)
#define VIA_REG_SGD_STAT_CP_ACTIVE (1<<13)
#define VIA_REG_SGD_STAT_FM_ACTIVE (1<<14)
#define VIA_REG_SGD_STAT_MR_FLAG (1<<16)
#define VIA_REG_SGD_STAT_MW_FLAG (1<<17)
#define VIA_REG_SGD_STAT_MR_EOL (1<<20)
#define VIA_REG_SGD_STAT_MW_EOL (1<<21)
#define VIA_REG_SGD_STAT_MR_STOP (1<<24)
#define VIA_REG_SGD_STAT_MW_STOP (1<<25)
#define VIA_REG_SGD_STAT_MR_ACTIVE (1<<28)
#define VIA_REG_SGD_STAT_MW_ACTIVE (1<<29)
#define VIA_REG_GPI_STATUS 0x88
#define VIA_REG_GPI_INTR 0x8c
#define VIA_TBL_BIT_FLAG 0x40000000
#define VIA_TBL_BIT_EOL 0x80000000
/* pci space */
#define VIA_ACLINK_STAT 0x40
#define VIA_ACLINK_C11_READY 0x20
#define VIA_ACLINK_C10_READY 0x10
#define VIA_ACLINK_C01_READY 0x04 /* secondary codec ready */
#define VIA_ACLINK_LOWPOWER 0x02 /* low-power state */
#define VIA_ACLINK_C00_READY 0x01 /* primary codec ready */
#define VIA_ACLINK_CTRL 0x41
#define VIA_ACLINK_CTRL_ENABLE 0x80 /* 0: disable, 1: enable */
#define VIA_ACLINK_CTRL_RESET 0x40 /* 0: assert, 1: de-assert */
#define VIA_ACLINK_CTRL_SYNC 0x20 /* 0: release SYNC, 1: force SYNC hi */
#define VIA_ACLINK_CTRL_SDO 0x10 /* 0: release SDO, 1: force SDO hi */
#define VIA_ACLINK_CTRL_VRA 0x08 /* 0: disable VRA, 1: enable VRA */
#define VIA_ACLINK_CTRL_PCM 0x04 /* 0: disable PCM, 1: enable PCM */
#define VIA_ACLINK_CTRL_FM 0x02 /* via686 only */
#define VIA_ACLINK_CTRL_SB 0x01 /* via686 only */
#define VIA_ACLINK_CTRL_INIT (VIA_ACLINK_CTRL_ENABLE|\
VIA_ACLINK_CTRL_RESET|\
VIA_ACLINK_CTRL_PCM)
#define VIA_FUNC_ENABLE 0x42
#define VIA_FUNC_MIDI_PNP 0x80 /* FIXME: it's 0x40 in the datasheet! */
#define VIA_FUNC_MIDI_IRQMASK 0x40 /* FIXME: not documented! */
#define VIA_FUNC_RX2C_WRITE 0x20
#define VIA_FUNC_SB_FIFO_EMPTY 0x10
#define VIA_FUNC_ENABLE_GAME 0x08
#define VIA_FUNC_ENABLE_FM 0x04
#define VIA_FUNC_ENABLE_MIDI 0x02
#define VIA_FUNC_ENABLE_SB 0x01
#define VIA_PNP_CONTROL 0x43
#define VIA_MC97_CTRL 0x44
#define VIA_MC97_CTRL_ENABLE 0x80
#define VIA_MC97_CTRL_SECONDARY 0x40
#define VIA_MC97_CTRL_INIT (VIA_MC97_CTRL_ENABLE|\
VIA_MC97_CTRL_SECONDARY)
/*
* pcm stream
*/
struct snd_via_sg_table {
unsigned int offset;
unsigned int size;
} ;
#define VIA_TABLE_SIZE 255
struct viadev {
unsigned int reg_offset;
unsigned long port;
int direction; /* playback = 0, capture = 1 */
struct snd_pcm_substream *substream;
int running;
unsigned int tbl_entries; /* # descriptors */
struct snd_dma_buffer table;
struct snd_via_sg_table *idx_table;
/* for recovery from the unexpected pointer */
unsigned int lastpos;
unsigned int bufsize;
unsigned int bufsize2;
};
enum { TYPE_CARD_VIA82XX_MODEM = 1 };
#define VIA_MAX_MODEM_DEVS 2
struct via82xx_modem {
int irq;
unsigned long port;
unsigned int intr_mask; /* SGD_SHADOW mask to check interrupts */
struct pci_dev *pci;
struct snd_card *card;
unsigned int num_devs;
unsigned int playback_devno, capture_devno;
struct viadev devs[VIA_MAX_MODEM_DEVS];
struct snd_pcm *pcms[2];
struct snd_ac97_bus *ac97_bus;
struct snd_ac97 *ac97;
unsigned int ac97_clock;
unsigned int ac97_secondary; /* secondary AC'97 codec is present */
spinlock_t reg_lock;
struct snd_info_entry *proc_entry;
};
static const struct pci_device_id snd_via82xx_modem_ids[] = {
{ PCI_VDEVICE(VIA, 0x3068), TYPE_CARD_VIA82XX_MODEM, },
{ 0, }
};
MODULE_DEVICE_TABLE(pci, snd_via82xx_modem_ids);
/*
*/
/*
* allocate and initialize the descriptor buffers
* periods = number of periods
* fragsize = period size in bytes
*/
static int build_via_table(struct viadev *dev, struct snd_pcm_substream *substream,
struct pci_dev *pci,
unsigned int periods, unsigned int fragsize)
{
unsigned int i, idx, ofs, rest;
struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
__le32 *pgtbl;
if (dev->table.area == NULL) {
/* the start of each lists must be aligned to 8 bytes,
* but the kernel pages are much bigger, so we don't care
*/
if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, &chip->pci->dev,
PAGE_ALIGN(VIA_TABLE_SIZE * 2 * 8),
&dev->table) < 0)
return -ENOMEM;
}
if (! dev->idx_table) {
dev->idx_table = kmalloc_array(VIA_TABLE_SIZE,
sizeof(*dev->idx_table),
GFP_KERNEL);
if (! dev->idx_table)
return -ENOMEM;
}
/* fill the entries */
idx = 0;
ofs = 0;
pgtbl = (__le32 *)dev->table.area;
for (i = 0; i < periods; i++) {
rest = fragsize;
/* fill descriptors for a period.
* a period can be split to several descriptors if it's
* over page boundary.
*/
do {
unsigned int r;
unsigned int flag;
unsigned int addr;
if (idx >= VIA_TABLE_SIZE) {
dev_err(&pci->dev, "too much table size!\n");
return -EINVAL;
}
addr = snd_pcm_sgbuf_get_addr(substream, ofs);
pgtbl[idx << 1] = cpu_to_le32(addr);
r = PAGE_SIZE - (ofs % PAGE_SIZE);
if (rest < r)
r = rest;
rest -= r;
if (! rest) {
if (i == periods - 1)
flag = VIA_TBL_BIT_EOL; /* buffer boundary */
else
flag = VIA_TBL_BIT_FLAG; /* period boundary */
} else
flag = 0; /* period continues to the next */
/*
dev_dbg(&pci->dev,
"tbl %d: at %d size %d (rest %d)\n",
idx, ofs, r, rest);
*/
pgtbl[(idx<<1) + 1] = cpu_to_le32(r | flag);
dev->idx_table[idx].offset = ofs;
dev->idx_table[idx].size = r;
ofs += r;
idx++;
} while (rest > 0);
}
dev->tbl_entries = idx;
dev->bufsize = periods * fragsize;
dev->bufsize2 = dev->bufsize / 2;
return 0;
}
static int clean_via_table(struct viadev *dev, struct snd_pcm_substream *substream,
struct pci_dev *pci)
{
if (dev->table.area) {
snd_dma_free_pages(&dev->table);
dev->table.area = NULL;
}
kfree(dev->idx_table);
dev->idx_table = NULL;
return 0;
}
/*
* Basic I/O
*/
static inline unsigned int snd_via82xx_codec_xread(struct via82xx_modem *chip)
{
return inl(VIAREG(chip, AC97));
}
static inline void snd_via82xx_codec_xwrite(struct via82xx_modem *chip, unsigned int val)
{
outl(val, VIAREG(chip, AC97));
}
static int snd_via82xx_codec_ready(struct via82xx_modem *chip, int secondary)
{
unsigned int timeout = 1000; /* 1ms */
unsigned int val;
while (timeout-- > 0) {
udelay(1);
if (!((val = snd_via82xx_codec_xread(chip)) & VIA_REG_AC97_BUSY))
return val & 0xffff;
}
dev_err(chip->card->dev, "codec_ready: codec %i is not ready [0x%x]\n",
secondary, snd_via82xx_codec_xread(chip));
return -EIO;
}
static int snd_via82xx_codec_valid(struct via82xx_modem *chip, int secondary)
{
unsigned int timeout = 1000; /* 1ms */
unsigned int val, val1;
unsigned int stat = !secondary ? VIA_REG_AC97_PRIMARY_VALID :
VIA_REG_AC97_SECONDARY_VALID;
while (timeout-- > 0) {
val = snd_via82xx_codec_xread(chip);
val1 = val & (VIA_REG_AC97_BUSY | stat);
if (val1 == stat)
return val & 0xffff;
udelay(1);
}
return -EIO;
}
static void snd_via82xx_codec_wait(struct snd_ac97 *ac97)
{
struct via82xx_modem *chip = ac97->private_data;
__always_unused int err;
err = snd_via82xx_codec_ready(chip, ac97->num);
/* here we need to wait fairly for long time.. */
msleep(500);
}
static void snd_via82xx_codec_write(struct snd_ac97 *ac97,
unsigned short reg,
unsigned short val)
{
struct via82xx_modem *chip = ac97->private_data;
unsigned int xval;
if(reg == AC97_GPIO_STATUS) {
outl(val, VIAREG(chip, GPI_STATUS));
return;
}
xval = !ac97->num ? VIA_REG_AC97_CODEC_ID_PRIMARY : VIA_REG_AC97_CODEC_ID_SECONDARY;
xval <<= VIA_REG_AC97_CODEC_ID_SHIFT;
xval |= reg << VIA_REG_AC97_CMD_SHIFT;
xval |= val << VIA_REG_AC97_DATA_SHIFT;
snd_via82xx_codec_xwrite(chip, xval);
snd_via82xx_codec_ready(chip, ac97->num);
}
static unsigned short snd_via82xx_codec_read(struct snd_ac97 *ac97, unsigned short reg)
{
struct via82xx_modem *chip = ac97->private_data;
unsigned int xval, val = 0xffff;
int again = 0;
xval = ac97->num << VIA_REG_AC97_CODEC_ID_SHIFT;
xval |= ac97->num ? VIA_REG_AC97_SECONDARY_VALID : VIA_REG_AC97_PRIMARY_VALID;
xval |= VIA_REG_AC97_READ;
xval |= (reg & 0x7f) << VIA_REG_AC97_CMD_SHIFT;
while (1) {
if (again++ > 3) {
dev_err(chip->card->dev,
"codec_read: codec %i is not valid [0x%x]\n",
ac97->num, snd_via82xx_codec_xread(chip));
return 0xffff;
}
snd_via82xx_codec_xwrite(chip, xval);
udelay (20);
if (snd_via82xx_codec_valid(chip, ac97->num) >= 0) {
udelay(25);
val = snd_via82xx_codec_xread(chip);
break;
}
}
return val & 0xffff;
}
static void snd_via82xx_channel_reset(struct via82xx_modem *chip, struct viadev *viadev)
{
outb(VIA_REG_CTRL_PAUSE | VIA_REG_CTRL_TERMINATE | VIA_REG_CTRL_RESET,
VIADEV_REG(viadev, OFFSET_CONTROL));
inb(VIADEV_REG(viadev, OFFSET_CONTROL));
udelay(50);
/* disable interrupts */
outb(0x00, VIADEV_REG(viadev, OFFSET_CONTROL));
/* clear interrupts */
outb(0x03, VIADEV_REG(viadev, OFFSET_STATUS));
outb(0x00, VIADEV_REG(viadev, OFFSET_TYPE)); /* for via686 */
// outl(0, VIADEV_REG(viadev, OFFSET_CURR_PTR));
viadev->lastpos = 0;
}
/*
* Interrupt handler
*/
static irqreturn_t snd_via82xx_interrupt(int irq, void *dev_id)
{
struct via82xx_modem *chip = dev_id;
unsigned int status;
unsigned int i;
status = inl(VIAREG(chip, SGD_SHADOW));
if (! (status & chip->intr_mask)) {
return IRQ_NONE;
}
// _skip_sgd:
/* check status for each stream */
spin_lock(&chip->reg_lock);
for (i = 0; i < chip->num_devs; i++) {
struct viadev *viadev = &chip->devs[i];
unsigned char c_status = inb(VIADEV_REG(viadev, OFFSET_STATUS));
c_status &= (VIA_REG_STAT_EOL|VIA_REG_STAT_FLAG|VIA_REG_STAT_STOPPED);
if (! c_status)
continue;
if (viadev->substream && viadev->running) {
spin_unlock(&chip->reg_lock);
snd_pcm_period_elapsed(viadev->substream);
spin_lock(&chip->reg_lock);
}
outb(c_status, VIADEV_REG(viadev, OFFSET_STATUS)); /* ack */
}
spin_unlock(&chip->reg_lock);
return IRQ_HANDLED;
}
/*
* PCM callbacks
*/
/*
* trigger callback
*/
static int snd_via82xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
struct viadev *viadev = substream->runtime->private_data;
unsigned char val = 0;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_SUSPEND:
val |= VIA_REG_CTRL_START;
viadev->running = 1;
break;
case SNDRV_PCM_TRIGGER_STOP:
val = VIA_REG_CTRL_TERMINATE;
viadev->running = 0;
break;
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
val |= VIA_REG_CTRL_PAUSE;
viadev->running = 0;
break;
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
viadev->running = 1;
break;
default:
return -EINVAL;
}
outb(val, VIADEV_REG(viadev, OFFSET_CONTROL));
if (cmd == SNDRV_PCM_TRIGGER_STOP)
snd_via82xx_channel_reset(chip, viadev);
return 0;
}
/*
* pointer callbacks
*/
/*
* calculate the linear position at the given sg-buffer index and the rest count
*/
#define check_invalid_pos(viadev,pos) \
((pos) < viadev->lastpos && ((pos) >= viadev->bufsize2 ||\
viadev->lastpos < viadev->bufsize2))
static inline unsigned int calc_linear_pos(struct via82xx_modem *chip,
struct viadev *viadev,
unsigned int idx,
unsigned int count)
{
unsigned int size, res;
size = viadev->idx_table[idx].size;
res = viadev->idx_table[idx].offset + size - count;
/* check the validity of the calculated position */
if (size < count) {
dev_err(chip->card->dev,
"invalid via82xx_cur_ptr (size = %d, count = %d)\n",
(int)size, (int)count);
res = viadev->lastpos;
} else if (check_invalid_pos(viadev, res)) {
#ifdef POINTER_DEBUG
dev_dbg(chip->card->dev,
"fail: idx = %i/%i, lastpos = 0x%x, bufsize2 = 0x%x, offsize = 0x%x, size = 0x%x, count = 0x%x\n",
idx, viadev->tbl_entries, viadev->lastpos,
viadev->bufsize2, viadev->idx_table[idx].offset,
viadev->idx_table[idx].size, count);
#endif
if (count && size < count) {
dev_dbg(chip->card->dev,
"invalid via82xx_cur_ptr, using last valid pointer\n");
res = viadev->lastpos;
} else {
if (! count)
/* bogus count 0 on the DMA boundary? */
res = viadev->idx_table[idx].offset;
else
/* count register returns full size
* when end of buffer is reached
*/
res = viadev->idx_table[idx].offset + size;
if (check_invalid_pos(viadev, res)) {
dev_dbg(chip->card->dev,
"invalid via82xx_cur_ptr (2), using last valid pointer\n");
res = viadev->lastpos;
}
}
}
viadev->lastpos = res; /* remember the last position */
if (res >= viadev->bufsize)
res -= viadev->bufsize;
return res;
}
/*
* get the current pointer on via686
*/
static snd_pcm_uframes_t snd_via686_pcm_pointer(struct snd_pcm_substream *substream)
{
struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
struct viadev *viadev = substream->runtime->private_data;
unsigned int idx, ptr, count, res;
if (snd_BUG_ON(!viadev->tbl_entries))
return 0;
if (!(inb(VIADEV_REG(viadev, OFFSET_STATUS)) & VIA_REG_STAT_ACTIVE))
return 0;
spin_lock(&chip->reg_lock);
count = inl(VIADEV_REG(viadev, OFFSET_CURR_COUNT)) & 0xffffff;
/* The via686a does not have the current index register,
* so we need to calculate the index from CURR_PTR.
*/
ptr = inl(VIADEV_REG(viadev, OFFSET_CURR_PTR));
if (ptr <= (unsigned int)viadev->table.addr)
idx = 0;
else /* CURR_PTR holds the address + 8 */
idx = ((ptr - (unsigned int)viadev->table.addr) / 8 - 1) %
viadev->tbl_entries;
res = calc_linear_pos(chip, viadev, idx, count);
spin_unlock(&chip->reg_lock);
return bytes_to_frames(substream->runtime, res);
}
/*
* hw_params callback:
* allocate the buffer and build up the buffer description table
*/
static int snd_via82xx_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
{
struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
struct viadev *viadev = substream->runtime->private_data;
int err;
err = build_via_table(viadev, substream, chip->pci,
params_periods(hw_params),
params_period_bytes(hw_params));
if (err < 0)
return err;
snd_ac97_write(chip->ac97, AC97_LINE1_RATE, params_rate(hw_params));
snd_ac97_write(chip->ac97, AC97_LINE1_LEVEL, 0);
return 0;
}
/*
* hw_free callback:
* clean up the buffer description table and release the buffer
*/
static int snd_via82xx_hw_free(struct snd_pcm_substream *substream)
{
struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
struct viadev *viadev = substream->runtime->private_data;
clean_via_table(viadev, substream, chip->pci);
return 0;
}
/*
* set up the table pointer
*/
static void snd_via82xx_set_table_ptr(struct via82xx_modem *chip, struct viadev *viadev)
{
snd_via82xx_codec_ready(chip, chip->ac97_secondary);
outl((u32)viadev->table.addr, VIADEV_REG(viadev, OFFSET_TABLE_PTR));
udelay(20);
snd_via82xx_codec_ready(chip, chip->ac97_secondary);
}
/*
* prepare callback for playback and capture
*/
static int snd_via82xx_pcm_prepare(struct snd_pcm_substream *substream)
{
struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
struct viadev *viadev = substream->runtime->private_data;
snd_via82xx_channel_reset(chip, viadev);
/* this must be set after channel_reset */
snd_via82xx_set_table_ptr(chip, viadev);
outb(VIA_REG_TYPE_AUTOSTART|VIA_REG_TYPE_INT_EOL|VIA_REG_TYPE_INT_FLAG,
VIADEV_REG(viadev, OFFSET_TYPE));
return 0;
}
/*
* pcm hardware definition, identical for both playback and capture
*/
static const struct snd_pcm_hardware snd_via82xx_hw =
{
.info = (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
SNDRV_PCM_INFO_BLOCK_TRANSFER |
SNDRV_PCM_INFO_MMAP_VALID |
/* SNDRV_PCM_INFO_RESUME | */
SNDRV_PCM_INFO_PAUSE),
.formats = SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE,
.rates = SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_KNOT,
.rate_min = 8000,
.rate_max = 16000,
.channels_min = 1,
.channels_max = 1,
.buffer_bytes_max = 128 * 1024,
.period_bytes_min = 32,
.period_bytes_max = 128 * 1024,
.periods_min = 2,
.periods_max = VIA_TABLE_SIZE / 2,
.fifo_size = 0,
};
/*
* open callback skeleton
*/
static int snd_via82xx_modem_pcm_open(struct via82xx_modem *chip, struct viadev *viadev,
struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
int err;
static const unsigned int rates[] = { 8000, 9600, 12000, 16000 };
static const struct snd_pcm_hw_constraint_list hw_constraints_rates = {
.count = ARRAY_SIZE(rates),
.list = rates,
.mask = 0,
};
runtime->hw = snd_via82xx_hw;
if ((err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
&hw_constraints_rates)) < 0)
return err;
/* we may remove following constaint when we modify table entries
in interrupt */
if ((err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS)) < 0)
return err;
runtime->private_data = viadev;
viadev->substream = substream;
return 0;
}
/*
* open callback for playback
*/
static int snd_via82xx_playback_open(struct snd_pcm_substream *substream)
{
struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
struct viadev *viadev = &chip->devs[chip->playback_devno + substream->number];
return snd_via82xx_modem_pcm_open(chip, viadev, substream);
}
/*
* open callback for capture
*/
static int snd_via82xx_capture_open(struct snd_pcm_substream *substream)
{
struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
struct viadev *viadev = &chip->devs[chip->capture_devno + substream->pcm->device];
return snd_via82xx_modem_pcm_open(chip, viadev, substream);
}
/*
* close callback
*/
static int snd_via82xx_pcm_close(struct snd_pcm_substream *substream)
{
struct viadev *viadev = substream->runtime->private_data;
viadev->substream = NULL;
return 0;
}
/* via686 playback callbacks */
static const struct snd_pcm_ops snd_via686_playback_ops = {
.open = snd_via82xx_playback_open,
.close = snd_via82xx_pcm_close,
.hw_params = snd_via82xx_hw_params,
.hw_free = snd_via82xx_hw_free,
.prepare = snd_via82xx_pcm_prepare,
.trigger = snd_via82xx_pcm_trigger,
.pointer = snd_via686_pcm_pointer,
};
/* via686 capture callbacks */
static const struct snd_pcm_ops snd_via686_capture_ops = {
.open = snd_via82xx_capture_open,
.close = snd_via82xx_pcm_close,
.hw_params = snd_via82xx_hw_params,
.hw_free = snd_via82xx_hw_free,
.prepare = snd_via82xx_pcm_prepare,
.trigger = snd_via82xx_pcm_trigger,
.pointer = snd_via686_pcm_pointer,
};
static void init_viadev(struct via82xx_modem *chip, int idx, unsigned int reg_offset,
int direction)
{
chip->devs[idx].reg_offset = reg_offset;
chip->devs[idx].direction = direction;
chip->devs[idx].port = chip->port + reg_offset;
}
/*
* create a pcm instance for via686a/b
*/
static int snd_via686_pcm_new(struct via82xx_modem *chip)
{
struct snd_pcm *pcm;
int err;
chip->playback_devno = 0;
chip->capture_devno = 1;
chip->num_devs = 2;
chip->intr_mask = 0x330000; /* FLAGS | EOL for MR, MW */
err = snd_pcm_new(chip->card, chip->card->shortname, 0, 1, 1, &pcm);
if (err < 0)
return err;
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_via686_playback_ops);
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_via686_capture_ops);
pcm->dev_class = SNDRV_PCM_CLASS_MODEM;
pcm->private_data = chip;
strcpy(pcm->name, chip->card->shortname);
chip->pcms[0] = pcm;
init_viadev(chip, 0, VIA_REG_MO_STATUS, 0);
init_viadev(chip, 1, VIA_REG_MI_STATUS, 1);
snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV_SG,
&chip->pci->dev, 64*1024, 128*1024);
return 0;
}
/*
* Mixer part
*/
static void snd_via82xx_mixer_free_ac97_bus(struct snd_ac97_bus *bus)
{
struct via82xx_modem *chip = bus->private_data;
chip->ac97_bus = NULL;
}
static void snd_via82xx_mixer_free_ac97(struct snd_ac97 *ac97)
{
struct via82xx_modem *chip = ac97->private_data;
chip->ac97 = NULL;
}
static int snd_via82xx_mixer_new(struct via82xx_modem *chip)
{
struct snd_ac97_template ac97;
int err;
static const struct snd_ac97_bus_ops ops = {
.write = snd_via82xx_codec_write,
.read = snd_via82xx_codec_read,
.wait = snd_via82xx_codec_wait,
};
if ((err = snd_ac97_bus(chip->card, 0, &ops, chip, &chip->ac97_bus)) < 0)
return err;
chip->ac97_bus->private_free = snd_via82xx_mixer_free_ac97_bus;
chip->ac97_bus->clock = chip->ac97_clock;
memset(&ac97, 0, sizeof(ac97));
ac97.private_data = chip;
ac97.private_free = snd_via82xx_mixer_free_ac97;
ac97.pci = chip->pci;
ac97.scaps = AC97_SCAP_SKIP_AUDIO | AC97_SCAP_POWER_SAVE;
ac97.num = chip->ac97_secondary;
if ((err = snd_ac97_mixer(chip->ac97_bus, &ac97, &chip->ac97)) < 0)
return err;
return 0;
}
/*
* proc interface
*/
static void snd_via82xx_proc_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
{
struct via82xx_modem *chip = entry->private_data;
int i;
snd_iprintf(buffer, "%s\n\n", chip->card->longname);
for (i = 0; i < 0xa0; i += 4) {
snd_iprintf(buffer, "%02x: %08x\n", i, inl(chip->port + i));
}
}
static void snd_via82xx_proc_init(struct via82xx_modem *chip)
{
snd_card_ro_proc_new(chip->card, "via82xx", chip,
snd_via82xx_proc_read);
}
/*
*
*/
static int snd_via82xx_chip_init(struct via82xx_modem *chip)
{
unsigned int val;
unsigned long end_time;
unsigned char pval;
pci_read_config_byte(chip->pci, VIA_MC97_CTRL, &pval);
if((pval & VIA_MC97_CTRL_INIT) != VIA_MC97_CTRL_INIT) {
pci_write_config_byte(chip->pci, 0x44, pval|VIA_MC97_CTRL_INIT);
udelay(100);
}
pci_read_config_byte(chip->pci, VIA_ACLINK_STAT, &pval);
if (! (pval & VIA_ACLINK_C00_READY)) { /* codec not ready? */
/* deassert ACLink reset, force SYNC */
pci_write_config_byte(chip->pci, VIA_ACLINK_CTRL,
VIA_ACLINK_CTRL_ENABLE |
VIA_ACLINK_CTRL_RESET |
VIA_ACLINK_CTRL_SYNC);
udelay(100);
#if 1 /* FIXME: should we do full reset here for all chip models? */
pci_write_config_byte(chip->pci, VIA_ACLINK_CTRL, 0x00);
udelay(100);
#else
/* deassert ACLink reset, force SYNC (warm AC'97 reset) */
pci_write_config_byte(chip->pci, VIA_ACLINK_CTRL,
VIA_ACLINK_CTRL_RESET|VIA_ACLINK_CTRL_SYNC);
udelay(2);
#endif
/* ACLink on, deassert ACLink reset, VSR, SGD data out */
pci_write_config_byte(chip->pci, VIA_ACLINK_CTRL, VIA_ACLINK_CTRL_INIT);
udelay(100);
}
pci_read_config_byte(chip->pci, VIA_ACLINK_CTRL, &pval);
if ((pval & VIA_ACLINK_CTRL_INIT) != VIA_ACLINK_CTRL_INIT) {
/* ACLink on, deassert ACLink reset, VSR, SGD data out */
pci_write_config_byte(chip->pci, VIA_ACLINK_CTRL, VIA_ACLINK_CTRL_INIT);
udelay(100);
}
/* wait until codec ready */
end_time = jiffies + msecs_to_jiffies(750);
do {
pci_read_config_byte(chip->pci, VIA_ACLINK_STAT, &pval);
if (pval & VIA_ACLINK_C00_READY) /* primary codec ready */
break;
schedule_timeout_uninterruptible(1);
} while (time_before(jiffies, end_time));
if ((val = snd_via82xx_codec_xread(chip)) & VIA_REG_AC97_BUSY)
dev_err(chip->card->dev,
"AC'97 codec is not ready [0x%x]\n", val);
snd_via82xx_codec_xwrite(chip, VIA_REG_AC97_READ |
VIA_REG_AC97_SECONDARY_VALID |
(VIA_REG_AC97_CODEC_ID_SECONDARY << VIA_REG_AC97_CODEC_ID_SHIFT));
end_time = jiffies + msecs_to_jiffies(750);
snd_via82xx_codec_xwrite(chip, VIA_REG_AC97_READ |
VIA_REG_AC97_SECONDARY_VALID |
(VIA_REG_AC97_CODEC_ID_SECONDARY << VIA_REG_AC97_CODEC_ID_SHIFT));
do {
if ((val = snd_via82xx_codec_xread(chip)) & VIA_REG_AC97_SECONDARY_VALID) {
chip->ac97_secondary = 1;
goto __ac97_ok2;
}
schedule_timeout_uninterruptible(1);
} while (time_before(jiffies, end_time));
/* This is ok, the most of motherboards have only one codec */
__ac97_ok2:
/* route FM trap to IRQ, disable FM trap */
// pci_write_config_byte(chip->pci, VIA_FM_NMI_CTRL, 0);
/* disable all GPI interrupts */
outl(0, VIAREG(chip, GPI_INTR));
return 0;
}
#ifdef CONFIG_PM_SLEEP
/*
* power management
*/
static int snd_via82xx_suspend(struct device *dev)
{
struct snd_card *card = dev_get_drvdata(dev);
struct via82xx_modem *chip = card->private_data;
int i;
snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
for (i = 0; i < chip->num_devs; i++)
snd_via82xx_channel_reset(chip, &chip->devs[i]);
snd_ac97_suspend(chip->ac97);
return 0;
}
static int snd_via82xx_resume(struct device *dev)
{
struct snd_card *card = dev_get_drvdata(dev);
struct via82xx_modem *chip = card->private_data;
int i;
snd_via82xx_chip_init(chip);
snd_ac97_resume(chip->ac97);
for (i = 0; i < chip->num_devs; i++)
snd_via82xx_channel_reset(chip, &chip->devs[i]);
snd_power_change_state(card, SNDRV_CTL_POWER_D0);
return 0;
}
static SIMPLE_DEV_PM_OPS(snd_via82xx_pm, snd_via82xx_suspend, snd_via82xx_resume);
#define SND_VIA82XX_PM_OPS &snd_via82xx_pm
#else
#define SND_VIA82XX_PM_OPS NULL
#endif /* CONFIG_PM_SLEEP */
static int snd_via82xx_free(struct via82xx_modem *chip)
{
unsigned int i;
if (chip->irq < 0)
goto __end_hw;
/* disable interrupts */
for (i = 0; i < chip->num_devs; i++)
snd_via82xx_channel_reset(chip, &chip->devs[i]);
__end_hw:
if (chip->irq >= 0)
free_irq(chip->irq, chip);
pci_release_regions(chip->pci);
pci_disable_device(chip->pci);
kfree(chip);
return 0;
}
static int snd_via82xx_dev_free(struct snd_device *device)
{
struct via82xx_modem *chip = device->device_data;
return snd_via82xx_free(chip);
}
static int snd_via82xx_create(struct snd_card *card,
struct pci_dev *pci,
int chip_type,
int revision,
unsigned int ac97_clock,
struct via82xx_modem **r_via)
{
struct via82xx_modem *chip;
int err;
static const struct snd_device_ops ops = {
.dev_free = snd_via82xx_dev_free,
};
if ((err = pci_enable_device(pci)) < 0)
return err;
if ((chip = kzalloc(sizeof(*chip), GFP_KERNEL)) == NULL) {
pci_disable_device(pci);
return -ENOMEM;
}
spin_lock_init(&chip->reg_lock);
chip->card = card;
chip->pci = pci;
chip->irq = -1;
if ((err = pci_request_regions(pci, card->driver)) < 0) {
kfree(chip);
pci_disable_device(pci);
return err;
}
chip->port = pci_resource_start(pci, 0);
if (request_irq(pci->irq, snd_via82xx_interrupt, IRQF_SHARED,
KBUILD_MODNAME, chip)) {
dev_err(card->dev, "unable to grab IRQ %d\n", pci->irq);
snd_via82xx_free(chip);
return -EBUSY;
}
chip->irq = pci->irq;
card->sync_irq = chip->irq;
if (ac97_clock >= 8000 && ac97_clock <= 48000)
chip->ac97_clock = ac97_clock;
if ((err = snd_via82xx_chip_init(chip)) < 0) {
snd_via82xx_free(chip);
return err;
}
if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
snd_via82xx_free(chip);
return err;
}
/* The 8233 ac97 controller does not implement the master bit
* in the pci command register. IMHO this is a violation of the PCI spec.
* We call pci_set_master here because it does not hurt. */
pci_set_master(pci);
*r_via = chip;
return 0;
}
static int snd_via82xx_probe(struct pci_dev *pci,
const struct pci_device_id *pci_id)
{
struct snd_card *card;
struct via82xx_modem *chip;
int chip_type = 0, card_type;
unsigned int i;
int err;
err = snd_card_new(&pci->dev, index, id, THIS_MODULE, 0, &card);
if (err < 0)
return err;
card_type = pci_id->driver_data;
switch (card_type) {
case TYPE_CARD_VIA82XX_MODEM:
strcpy(card->driver, "VIA82XX-MODEM");
sprintf(card->shortname, "VIA 82XX modem");
break;
default:
dev_err(card->dev, "invalid card type %d\n", card_type);
err = -EINVAL;
goto __error;
}
if ((err = snd_via82xx_create(card, pci, chip_type, pci->revision,
ac97_clock, &chip)) < 0)
goto __error;
card->private_data = chip;
if ((err = snd_via82xx_mixer_new(chip)) < 0)
goto __error;
if ((err = snd_via686_pcm_new(chip)) < 0 )
goto __error;
/* disable interrupts */
for (i = 0; i < chip->num_devs; i++)
snd_via82xx_channel_reset(chip, &chip->devs[i]);
sprintf(card->longname, "%s at 0x%lx, irq %d",
card->shortname, chip->port, chip->irq);
snd_via82xx_proc_init(chip);
if ((err = snd_card_register(card)) < 0) {
snd_card_free(card);
return err;
}
pci_set_drvdata(pci, card);
return 0;
__error:
snd_card_free(card);
return err;
}
static void snd_via82xx_remove(struct pci_dev *pci)
{
snd_card_free(pci_get_drvdata(pci));
}
static struct pci_driver via82xx_modem_driver = {
.name = KBUILD_MODNAME,
.id_table = snd_via82xx_modem_ids,
.probe = snd_via82xx_probe,
.remove = snd_via82xx_remove,
.driver = {
.pm = SND_VIA82XX_PM_OPS,
},
};
module_pci_driver(via82xx_modem_driver);
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