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linux/sound/pci/atiixp_modem.c
Takashi Iwai b83bea3864 ALSA: atiixp: Fix assignment in if condition 
PCI ATIIXP driver code contains a few assignments in if condition,
which is a bad coding style that may confuse readers and occasionally
lead to bugs.

This patch is merely for coding-style fixes, no functional changes.

Link: https://lore.kernel.org/r/20210608140540.17885-20-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2021-06-09 17:29:51 +02:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* ALSA driver for ATI IXP 150/200/250 AC97 modem controllers
*
* Copyright (c) 2004 Takashi Iwai <tiwai@suse.de>
*/
#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 <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 <tiwai@suse.de>");
MODULE_DESCRIPTION("ATI IXP MC97 controller");
MODULE_LICENSE("GPL");
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 bool 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 {
__le32 addr; /* DMA buffer address */
u16 status; /* status bits */
u16 size; /* size of the packet in dwords */
__le32 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 const struct pci_device_id snd_atiixp_ids[] = {
{ PCI_VDEVICE(ATI, 0x434d), 0 }, /* SB200 */
{ PCI_VDEVICE(ATI, 0x4378), 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, &chip->pci->dev,
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--) {
dev_warn(chip->card->dev, "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)
dev_warn(chip->card->dev, "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;
atiixp_write(chip, PHYS_OUT_ADDR, data);
}
static unsigned short snd_atiixp_ac97_read(struct snd_ac97 *ac97,
unsigned short reg)
{
struct atiixp_modem *chip = ac97->private_data;
return snd_atiixp_codec_read(chip, ac97->num, reg);
}
static void snd_atiixp_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
unsigned short val)
{
struct atiixp_modem *chip = ac97->private_data;
if (reg == AC97_GPIO_STATUS) {
atiixp_write(chip, MODEM_OUT_GPIO,
(val << ATI_REG_MODEM_OUT_GPIO_DATA_SHIFT) | ATI_REG_MODEM_OUT_GPIO_EN);
return;
}
snd_atiixp_codec_write(chip, ac97->num, reg, val);
}
/*
* reset AC link
*/
static int snd_atiixp_aclink_reset(struct atiixp_modem *chip)
{
int timeout;
/* reset powerdoewn */
if (atiixp_update(chip, CMD, ATI_REG_CMD_POWERDOWN, 0))
udelay(10);
/* perform a software reset */
atiixp_update(chip, CMD, ATI_REG_CMD_AC_SOFT_RESET, ATI_REG_CMD_AC_SOFT_RESET);
atiixp_read(chip, CMD);
udelay(10);
atiixp_update(chip, CMD, ATI_REG_CMD_AC_SOFT_RESET, 0);
timeout = 10;
while (! (atiixp_read(chip, CMD) & ATI_REG_CMD_ACLINK_ACTIVE)) {
/* do a hard reset */
atiixp_update(chip, CMD, ATI_REG_CMD_AC_SYNC|ATI_REG_CMD_AC_RESET,
ATI_REG_CMD_AC_SYNC);
atiixp_read(chip, CMD);
msleep(1);
atiixp_update(chip, CMD, ATI_REG_CMD_AC_RESET, ATI_REG_CMD_AC_RESET);
if (!--timeout) {
dev_err(chip->card->dev, "codec reset timeout\n");
break;
}
}
/* deassert RESET and assert SYNC to make sure */
atiixp_update(chip, CMD, ATI_REG_CMD_AC_SYNC|ATI_REG_CMD_AC_RESET,
ATI_REG_CMD_AC_SYNC|ATI_REG_CMD_AC_RESET);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int snd_atiixp_aclink_down(struct atiixp_modem *chip)
{
// if (atiixp_read(chip, MODEM_MIRROR) & 0x1) /* modem running, too? */
// return -EBUSY;
atiixp_update(chip, CMD,
ATI_REG_CMD_POWERDOWN | ATI_REG_CMD_AC_RESET,
ATI_REG_CMD_POWERDOWN);
return 0;
}
#endif
/*
* auto-detection of codecs
*
* the IXP chip can generate interrupts for the non-existing codecs.
* NEW_FRAME interrupt is used to make sure that the interrupt is generated
* even if all three codecs are connected.
*/
#define ALL_CODEC_NOT_READY \
(ATI_REG_ISR_CODEC0_NOT_READY |\
ATI_REG_ISR_CODEC1_NOT_READY |\
ATI_REG_ISR_CODEC2_NOT_READY)
#define CODEC_CHECK_BITS (ALL_CODEC_NOT_READY|ATI_REG_ISR_NEW_FRAME)
static int snd_atiixp_codec_detect(struct atiixp_modem *chip)
{
int timeout;
chip->codec_not_ready_bits = 0;
atiixp_write(chip, IER, CODEC_CHECK_BITS);
/* wait for the interrupts */
timeout = 50;
while (timeout-- > 0) {
msleep(1);
if (chip->codec_not_ready_bits)
break;
}
atiixp_write(chip, IER, 0); /* disable irqs */
if ((chip->codec_not_ready_bits & ALL_CODEC_NOT_READY) == ALL_CODEC_NOT_READY) {
dev_err(chip->card->dev, "no codec detected!\n");
return -ENXIO;
}
return 0;
}
/*
* enable DMA and irqs
*/
static int snd_atiixp_chip_start(struct atiixp_modem *chip)
{
unsigned int reg;
/* set up spdif, enable burst mode */
reg = atiixp_read(chip, CMD);
reg |= ATI_REG_CMD_BURST_EN;
if(!(reg & ATI_REG_CMD_MODEM_PRESENT))
reg |= ATI_REG_CMD_MODEM_PRESENT;
atiixp_write(chip, CMD, reg);
/* clear all interrupt source */
atiixp_write(chip, ISR, 0xffffffff);
/* enable irqs */
atiixp_write(chip, IER,
ATI_REG_IER_MODEM_STATUS_EN |
ATI_REG_IER_MODEM_IN_XRUN_EN |
ATI_REG_IER_MODEM_OUT1_XRUN_EN);
return 0;
}
/*
* disable DMA and IRQs
*/
static int snd_atiixp_chip_stop(struct atiixp_modem *chip)
{
/* clear interrupt source */
atiixp_write(chip, ISR, atiixp_read(chip, ISR));
/* disable irqs */
atiixp_write(chip, IER, 0);
return 0;
}
/*
* PCM section
*/
/*
* pointer callback simplly reads XXX_DMA_DT_CUR register as the current
* position. when SG-buffer is implemented, the offset must be calculated
* correctly...
*/
static snd_pcm_uframes_t snd_atiixp_pcm_pointer(struct snd_pcm_substream *substream)
{
struct atiixp_modem *chip = snd_pcm_substream_chip(substream);
struct snd_pcm_runtime *runtime = substream->runtime;
struct atiixp_dma *dma = runtime->private_data;
unsigned int curptr;
int timeout = 1000;
while (timeout--) {
curptr = readl(chip->remap_addr + dma->ops->dt_cur);
if (curptr < dma->buf_addr)
continue;
curptr -= dma->buf_addr;
if (curptr >= dma->buf_bytes)
continue;
return bytes_to_frames(runtime, curptr);
}
dev_dbg(chip->card->dev, "invalid DMA pointer read 0x%x (buf=%x)\n",
readl(chip->remap_addr + dma->ops->dt_cur), dma->buf_addr);
return 0;
}
/*
* XRUN detected, and stop the PCM substream
*/
static void snd_atiixp_xrun_dma(struct atiixp_modem *chip,
struct atiixp_dma *dma)
{
if (! dma->substream || ! dma->running)
return;
dev_dbg(chip->card->dev, "XRUN detected (DMA %d)\n", dma->ops->type);
snd_pcm_stop_xrun(dma->substream);
}
/*
* the period ack. update the substream.
*/
static void snd_atiixp_update_dma(struct atiixp_modem *chip,
struct atiixp_dma *dma)
{
if (! dma->substream || ! dma->running)
return;
snd_pcm_period_elapsed(dma->substream);
}
/* set BUS_BUSY interrupt bit if any DMA is running */
/* call with spinlock held */
static void snd_atiixp_check_bus_busy(struct atiixp_modem *chip)
{
unsigned int bus_busy;
if (atiixp_read(chip, CMD) & (ATI_REG_CMD_MODEM_SEND1_EN |
ATI_REG_CMD_MODEM_RECEIVE_EN))
bus_busy = ATI_REG_IER_MODEM_SET_BUS_BUSY;
else
bus_busy = 0;
atiixp_update(chip, IER, ATI_REG_IER_MODEM_SET_BUS_BUSY, bus_busy);
}
/* common trigger callback
* calling the lowlevel callbacks in it
*/
static int snd_atiixp_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct atiixp_modem *chip = snd_pcm_substream_chip(substream);
struct atiixp_dma *dma = substream->runtime->private_data;
int err = 0;
if (snd_BUG_ON(!dma->ops->enable_transfer ||
!dma->ops->flush_dma))
return -EINVAL;
spin_lock(&chip->reg_lock);
switch(cmd) {
case SNDRV_PCM_TRIGGER_START:
dma->ops->enable_transfer(chip, 1);
dma->running = 1;
break;
case SNDRV_PCM_TRIGGER_STOP:
dma->ops->enable_transfer(chip, 0);
dma->running = 0;
break;
default:
err = -EINVAL;
break;
}
if (! err) {
snd_atiixp_check_bus_busy(chip);
if (cmd == SNDRV_PCM_TRIGGER_STOP) {
dma->ops->flush_dma(chip);
snd_atiixp_check_bus_busy(chip);
}
}
spin_unlock(&chip->reg_lock);
return err;
}
/*
* lowlevel callbacks for each DMA type
*
* every callback is supposed to be called in chip->reg_lock spinlock
*/
/* flush FIFO of analog OUT DMA */
static void atiixp_out_flush_dma(struct atiixp_modem *chip)
{
atiixp_write(chip, MODEM_FIFO_FLUSH, ATI_REG_MODEM_FIFO_OUT1_FLUSH);
}
/* enable/disable analog OUT DMA */
static void atiixp_out_enable_dma(struct atiixp_modem *chip, int on)
{
unsigned int data;
data = atiixp_read(chip, CMD);
if (on) {
if (data & ATI_REG_CMD_MODEM_OUT_DMA1_EN)
return;
atiixp_out_flush_dma(chip);
data |= ATI_REG_CMD_MODEM_OUT_DMA1_EN;
} else
data &= ~ATI_REG_CMD_MODEM_OUT_DMA1_EN;
atiixp_write(chip, CMD, data);
}
/* start/stop transfer over OUT DMA */
static void atiixp_out_enable_transfer(struct atiixp_modem *chip, int on)
{
atiixp_update(chip, CMD, ATI_REG_CMD_MODEM_SEND1_EN,
on ? ATI_REG_CMD_MODEM_SEND1_EN : 0);
}
/* enable/disable analog IN DMA */
static void atiixp_in_enable_dma(struct atiixp_modem *chip, int on)
{
atiixp_update(chip, CMD, ATI_REG_CMD_MODEM_IN_DMA_EN,
on ? ATI_REG_CMD_MODEM_IN_DMA_EN : 0);
}
/* start/stop analog IN DMA */
static void atiixp_in_enable_transfer(struct atiixp_modem *chip, int on)
{
if (on) {
unsigned int data = atiixp_read(chip, CMD);
if (! (data & ATI_REG_CMD_MODEM_RECEIVE_EN)) {
data |= ATI_REG_CMD_MODEM_RECEIVE_EN;
atiixp_write(chip, CMD, data);
}
} else
atiixp_update(chip, CMD, ATI_REG_CMD_MODEM_RECEIVE_EN, 0);
}
/* flush FIFO of analog IN DMA */
static void atiixp_in_flush_dma(struct atiixp_modem *chip)
{
atiixp_write(chip, MODEM_FIFO_FLUSH, ATI_REG_MODEM_FIFO_IN_FLUSH);
}
/* set up slots and formats for analog OUT */
static int snd_atiixp_playback_prepare(struct snd_pcm_substream *substream)
{
struct atiixp_modem *chip = snd_pcm_substream_chip(substream);
unsigned int data;
spin_lock_irq(&chip->reg_lock);
/* set output threshold */
data = atiixp_read(chip, MODEM_OUT_FIFO);
data &= ~ATI_REG_MODEM_OUT1_DMA_THRESHOLD_MASK;
data |= 0x04 << ATI_REG_MODEM_OUT1_DMA_THRESHOLD_SHIFT;
atiixp_write(chip, MODEM_OUT_FIFO, data);
spin_unlock_irq(&chip->reg_lock);
return 0;
}
/* set up slots and formats for analog IN */
static int snd_atiixp_capture_prepare(struct snd_pcm_substream *substream)
{
return 0;
}
/*
* hw_params - allocate the buffer and set up buffer descriptors
*/
static int snd_atiixp_pcm_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
{
struct atiixp_modem *chip = snd_pcm_substream_chip(substream);
struct atiixp_dma *dma = substream->runtime->private_data;
int err;
int i;
dma->buf_addr = substream->runtime->dma_addr;
dma->buf_bytes = params_buffer_bytes(hw_params);
err = atiixp_build_dma_packets(chip, dma, substream,
params_periods(hw_params),
params_period_bytes(hw_params));
if (err < 0)
return err;
/* set up modem rate */
for (i = 0; i < NUM_ATI_CODECS; i++) {
if (! chip->ac97[i])
continue;
snd_ac97_write(chip->ac97[i], AC97_LINE1_RATE, params_rate(hw_params));
snd_ac97_write(chip->ac97[i], AC97_LINE1_LEVEL, 0);
}
return err;
}
static int snd_atiixp_pcm_hw_free(struct snd_pcm_substream *substream)
{
struct atiixp_modem *chip = snd_pcm_substream_chip(substream);
struct atiixp_dma *dma = substream->runtime->private_data;
atiixp_clear_dma_packets(chip, dma, substream);
return 0;
}
/*
* pcm hardware definition, identical for all DMA types
*/
static const struct snd_pcm_hardware snd_atiixp_pcm_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_8000 |
SNDRV_PCM_RATE_16000 |
SNDRV_PCM_RATE_KNOT),
.rate_min = 8000,
.rate_max = 16000,
.channels_min = 2,
.channels_max = 2,
.buffer_bytes_max = 256 * 1024,
.period_bytes_min = 32,
.period_bytes_max = 128 * 1024,
.periods_min = 2,
.periods_max = ATI_MAX_DESCRIPTORS,
};
static int snd_atiixp_pcm_open(struct snd_pcm_substream *substream,
struct atiixp_dma *dma, int pcm_type)
{
struct atiixp_modem *chip = snd_pcm_substream_chip(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,
};
if (snd_BUG_ON(!dma->ops || !dma->ops->enable_dma))
return -EINVAL;
if (dma->opened)
return -EBUSY;
dma->substream = substream;
runtime->hw = snd_atiixp_pcm_hw;
dma->ac97_pcm_type = pcm_type;
err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
&hw_constraints_rates);
if (err < 0)
return err;
err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
if (err < 0)
return err;
runtime->private_data = dma;
/* enable DMA bits */
spin_lock_irq(&chip->reg_lock);
dma->ops->enable_dma(chip, 1);
spin_unlock_irq(&chip->reg_lock);
dma->opened = 1;
return 0;
}
static int snd_atiixp_pcm_close(struct snd_pcm_substream *substream,
struct atiixp_dma *dma)
{
struct atiixp_modem *chip = snd_pcm_substream_chip(substream);
/* disable DMA bits */
if (snd_BUG_ON(!dma->ops || !dma->ops->enable_dma))
return -EINVAL;
spin_lock_irq(&chip->reg_lock);
dma->ops->enable_dma(chip, 0);
spin_unlock_irq(&chip->reg_lock);
dma->substream = NULL;
dma->opened = 0;
return 0;
}
/*
*/
static int snd_atiixp_playback_open(struct snd_pcm_substream *substream)
{
struct atiixp_modem *chip = snd_pcm_substream_chip(substream);
int err;
mutex_lock(&chip->open_mutex);
err = snd_atiixp_pcm_open(substream, &chip->dmas[ATI_DMA_PLAYBACK], 0);
mutex_unlock(&chip->open_mutex);
if (err < 0)
return err;
return 0;
}
static int snd_atiixp_playback_close(struct snd_pcm_substream *substream)
{
struct atiixp_modem *chip = snd_pcm_substream_chip(substream);
int err;
mutex_lock(&chip->open_mutex);
err = snd_atiixp_pcm_close(substream, &chip->dmas[ATI_DMA_PLAYBACK]);
mutex_unlock(&chip->open_mutex);
return err;
}
static int snd_atiixp_capture_open(struct snd_pcm_substream *substream)
{
struct atiixp_modem *chip = snd_pcm_substream_chip(substream);
return snd_atiixp_pcm_open(substream, &chip->dmas[ATI_DMA_CAPTURE], 1);
}
static int snd_atiixp_capture_close(struct snd_pcm_substream *substream)
{
struct atiixp_modem *chip = snd_pcm_substream_chip(substream);
return snd_atiixp_pcm_close(substream, &chip->dmas[ATI_DMA_CAPTURE]);
}
/* AC97 playback */
static const struct snd_pcm_ops snd_atiixp_playback_ops = {
.open = snd_atiixp_playback_open,
.close = snd_atiixp_playback_close,
.hw_params = snd_atiixp_pcm_hw_params,
.hw_free = snd_atiixp_pcm_hw_free,
.prepare = snd_atiixp_playback_prepare,
.trigger = snd_atiixp_pcm_trigger,
.pointer = snd_atiixp_pcm_pointer,
};
/* AC97 capture */
static const struct snd_pcm_ops snd_atiixp_capture_ops = {
.open = snd_atiixp_capture_open,
.close = snd_atiixp_capture_close,
.hw_params = snd_atiixp_pcm_hw_params,
.hw_free = snd_atiixp_pcm_hw_free,
.prepare = snd_atiixp_capture_prepare,
.trigger = snd_atiixp_pcm_trigger,
.pointer = snd_atiixp_pcm_pointer,
};
static const struct atiixp_dma_ops snd_atiixp_playback_dma_ops = {
.type = ATI_DMA_PLAYBACK,
.llp_offset = ATI_REG_MODEM_OUT_DMA1_LINKPTR,
.dt_cur = ATI_REG_MODEM_OUT_DMA1_DT_CUR,
.enable_dma = atiixp_out_enable_dma,
.enable_transfer = atiixp_out_enable_transfer,
.flush_dma = atiixp_out_flush_dma,
};
static const struct atiixp_dma_ops snd_atiixp_capture_dma_ops = {
.type = ATI_DMA_CAPTURE,
.llp_offset = ATI_REG_MODEM_IN_DMA_LINKPTR,
.dt_cur = ATI_REG_MODEM_IN_DMA_DT_CUR,
.enable_dma = atiixp_in_enable_dma,
.enable_transfer = atiixp_in_enable_transfer,
.flush_dma = atiixp_in_flush_dma,
};
static int snd_atiixp_pcm_new(struct atiixp_modem *chip)
{
struct snd_pcm *pcm;
int err;
/* initialize constants */
chip->dmas[ATI_DMA_PLAYBACK].ops = &snd_atiixp_playback_dma_ops;
chip->dmas[ATI_DMA_CAPTURE].ops = &snd_atiixp_capture_dma_ops;
/* PCM #0: analog I/O */
err = snd_pcm_new(chip->card, "ATI IXP MC97", ATI_PCMDEV_ANALOG, 1, 1, &pcm);
if (err < 0)
return err;
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_atiixp_playback_ops);
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_atiixp_capture_ops);
pcm->dev_class = SNDRV_PCM_CLASS_MODEM;
pcm->private_data = chip;
strcpy(pcm->name, "ATI IXP MC97");
chip->pcmdevs[ATI_PCMDEV_ANALOG] = pcm;
snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV,
&chip->pci->dev, 64*1024, 128*1024);
return 0;
}
/*
* interrupt handler
*/
static irqreturn_t snd_atiixp_interrupt(int irq, void *dev_id)
{
struct atiixp_modem *chip = dev_id;
unsigned int status;
status = atiixp_read(chip, ISR);
if (! status)
return IRQ_NONE;
/* process audio DMA */
if (status & ATI_REG_ISR_MODEM_OUT1_XRUN)
snd_atiixp_xrun_dma(chip, &chip->dmas[ATI_DMA_PLAYBACK]);
else if (status & ATI_REG_ISR_MODEM_OUT1_STATUS)
snd_atiixp_update_dma(chip, &chip->dmas[ATI_DMA_PLAYBACK]);
if (status & ATI_REG_ISR_MODEM_IN_XRUN)
snd_atiixp_xrun_dma(chip, &chip->dmas[ATI_DMA_CAPTURE]);
else if (status & ATI_REG_ISR_MODEM_IN_STATUS)
snd_atiixp_update_dma(chip, &chip->dmas[ATI_DMA_CAPTURE]);
/* for codec detection */
if (status & CODEC_CHECK_BITS) {
unsigned int detected;
detected = status & CODEC_CHECK_BITS;
spin_lock(&chip->reg_lock);
chip->codec_not_ready_bits |= detected;
atiixp_update(chip, IER, detected, 0); /* disable the detected irqs */
spin_unlock(&chip->reg_lock);
}
/* ack */
atiixp_write(chip, ISR, status);
return IRQ_HANDLED;
}
/*
* ac97 mixer section
*/
static int snd_atiixp_mixer_new(struct atiixp_modem *chip, int clock)
{
struct snd_ac97_bus *pbus;
struct snd_ac97_template ac97;
int i, err;
int codec_count;
static const struct snd_ac97_bus_ops ops = {
.write = snd_atiixp_ac97_write,
.read = snd_atiixp_ac97_read,
};
static const unsigned int codec_skip[NUM_ATI_CODECS] = {
ATI_REG_ISR_CODEC0_NOT_READY,
ATI_REG_ISR_CODEC1_NOT_READY,
ATI_REG_ISR_CODEC2_NOT_READY,
};
if (snd_atiixp_codec_detect(chip) < 0)
return -ENXIO;
err = snd_ac97_bus(chip->card, 0, &ops, chip, &pbus);
if (err < 0)
return err;
pbus->clock = clock;
chip->ac97_bus = pbus;
codec_count = 0;
for (i = 0; i < NUM_ATI_CODECS; i++) {
if (chip->codec_not_ready_bits & codec_skip[i])
continue;
memset(&ac97, 0, sizeof(ac97));
ac97.private_data = chip;
ac97.pci = chip->pci;
ac97.num = i;
ac97.scaps = AC97_SCAP_SKIP_AUDIO | AC97_SCAP_POWER_SAVE;
err = snd_ac97_mixer(pbus, &ac97, &chip->ac97[i]);
if (err < 0) {
chip->ac97[i] = NULL; /* to be sure */
dev_dbg(chip->card->dev,
"codec %d not available for modem\n", i);
continue;
}
codec_count++;
}
if (! codec_count) {
dev_err(chip->card->dev, "no codec available\n");
return -ENODEV;
}
/* snd_ac97_tune_hardware(chip->ac97, ac97_quirks); */
return 0;
}
#ifdef CONFIG_PM_SLEEP
/*
* power management
*/
static int snd_atiixp_suspend(struct device *dev)
{
struct snd_card *card = dev_get_drvdata(dev);
struct atiixp_modem *chip = card->private_data;
int i;
snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
for (i = 0; i < NUM_ATI_CODECS; i++)
snd_ac97_suspend(chip->ac97[i]);
snd_atiixp_aclink_down(chip);
snd_atiixp_chip_stop(chip);
return 0;
}
static int snd_atiixp_resume(struct device *dev)
{
struct snd_card *card = dev_get_drvdata(dev);
struct atiixp_modem *chip = card->private_data;
int i;
snd_atiixp_aclink_reset(chip);
snd_atiixp_chip_start(chip);
for (i = 0; i < NUM_ATI_CODECS; i++)
snd_ac97_resume(chip->ac97[i]);
snd_power_change_state(card, SNDRV_CTL_POWER_D0);
return 0;
}
static SIMPLE_DEV_PM_OPS(snd_atiixp_pm, snd_atiixp_suspend, snd_atiixp_resume);
#define SND_ATIIXP_PM_OPS &snd_atiixp_pm
#else
#define SND_ATIIXP_PM_OPS NULL
#endif /* CONFIG_PM_SLEEP */
/*
* proc interface for register dump
*/
static void snd_atiixp_proc_read(struct snd_info_entry *entry,
struct snd_info_buffer *buffer)
{
struct atiixp_modem *chip = entry->private_data;
int i;
for (i = 0; i < 256; i += 4)
snd_iprintf(buffer, "%02x: %08x\n", i, readl(chip->remap_addr + i));
}
static void snd_atiixp_proc_init(struct atiixp_modem *chip)
{
snd_card_ro_proc_new(chip->card, "atiixp-modem", chip,
snd_atiixp_proc_read);
}
/*
* destructor
*/
static int snd_atiixp_free(struct atiixp_modem *chip)
{
if (chip->irq < 0)
goto __hw_end;
snd_atiixp_chip_stop(chip);
__hw_end:
if (chip->irq >= 0)
free_irq(chip->irq, chip);
iounmap(chip->remap_addr);
pci_release_regions(chip->pci);
pci_disable_device(chip->pci);
kfree(chip);
return 0;
}
static int snd_atiixp_dev_free(struct snd_device *device)
{
struct atiixp_modem *chip = device->device_data;
return snd_atiixp_free(chip);
}
/*
* constructor for chip instance
*/
static int snd_atiixp_create(struct snd_card *card,
struct pci_dev *pci,
struct atiixp_modem **r_chip)
{
static const struct snd_device_ops ops = {
.dev_free = snd_atiixp_dev_free,
};
struct atiixp_modem *chip;
int err;
err = pci_enable_device(pci);
if (err < 0)
return err;
chip = kzalloc(sizeof(*chip), GFP_KERNEL);
if (chip == NULL) {
pci_disable_device(pci);
return -ENOMEM;
}
spin_lock_init(&chip->reg_lock);
mutex_init(&chip->open_mutex);
chip->card = card;
chip->pci = pci;
chip->irq = -1;
err = pci_request_regions(pci, "ATI IXP MC97");
if (err < 0) {
kfree(chip);
pci_disable_device(pci);
return err;
}
chip->addr = pci_resource_start(pci, 0);
chip->remap_addr = pci_ioremap_bar(pci, 0);
if (chip->remap_addr == NULL) {
dev_err(card->dev, "AC'97 space ioremap problem\n");
snd_atiixp_free(chip);
return -EIO;
}
if (request_irq(pci->irq, snd_atiixp_interrupt, IRQF_SHARED,
KBUILD_MODNAME, chip)) {
dev_err(card->dev, "unable to grab IRQ %d\n", pci->irq);
snd_atiixp_free(chip);
return -EBUSY;
}
chip->irq = pci->irq;
card->sync_irq = chip->irq;
pci_set_master(pci);
err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
if (err < 0) {
snd_atiixp_free(chip);
return err;
}
*r_chip = chip;
return 0;
}
static int snd_atiixp_probe(struct pci_dev *pci,
const struct pci_device_id *pci_id)
{
struct snd_card *card;
struct atiixp_modem *chip;
int err;
err = snd_card_new(&pci->dev, index, id, THIS_MODULE, 0, &card);
if (err < 0)
return err;
strcpy(card->driver, "ATIIXP-MODEM");
strcpy(card->shortname, "ATI IXP Modem");
err = snd_atiixp_create(card, pci, &chip);
if (err < 0)
goto __error;
card->private_data = chip;
err = snd_atiixp_aclink_reset(chip);
if (err < 0)
goto __error;
err = snd_atiixp_mixer_new(chip, ac97_clock);
if (err < 0)
goto __error;
err = snd_atiixp_pcm_new(chip);
if (err < 0)
goto __error;
snd_atiixp_proc_init(chip);
snd_atiixp_chip_start(chip);
sprintf(card->longname, "%s rev %x at 0x%lx, irq %i",
card->shortname, pci->revision, chip->addr, chip->irq);
err = snd_card_register(card);
if (err < 0)
goto __error;
pci_set_drvdata(pci, card);
return 0;
__error:
snd_card_free(card);
return err;
}
static void snd_atiixp_remove(struct pci_dev *pci)
{
snd_card_free(pci_get_drvdata(pci));
}
static struct pci_driver atiixp_modem_driver = {
.name = KBUILD_MODNAME,
.id_table = snd_atiixp_ids,
.probe = snd_atiixp_probe,
.remove = snd_atiixp_remove,
.driver = {
.pm = SND_ATIIXP_PM_OPS,
},
};
module_pci_driver(atiixp_modem_driver);
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