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// SPDX-License-Identifier: GPL-2.0-or-later
/*
*
* Support for CX23885 analog audio capture
*
* (c) 2008 Mijhail Moreyra <mijhail.moreyra@gmail.com>
* Adapted from cx88-alsa.c
* (c) 2009 Steven Toth <stoth@kernellabs.com>
*/
#include "cx23885.h"
#include "cx23885-reg.h"
#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/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/control.h>
#include <sound/initval.h>
#include <sound/tlv.h>
#define AUDIO_SRAM_CHANNEL SRAM_CH07
#define dprintk(level, fmt, arg...) do { \
if (audio_debug + 1 > level) \
printk(KERN_DEBUG pr_fmt("%s: alsa: " fmt), \
chip->dev->name, ##arg); \
} while(0)
/****************************************************************************
Module global static vars
****************************************************************************/
static unsigned int disable_analog_audio;
module_param(disable_analog_audio, int, 0644);
MODULE_PARM_DESC(disable_analog_audio, "disable analog audio ALSA driver");
static unsigned int audio_debug;
module_param(audio_debug, int, 0644);
MODULE_PARM_DESC(audio_debug, "enable debug messages [analog audio]");
/****************************************************************************
Board specific functions
****************************************************************************/
/* Constants taken from cx88-reg.h */
#define AUD_INT_DN_RISCI1 (1 << 0)
#define AUD_INT_UP_RISCI1 (1 << 1)
#define AUD_INT_RDS_DN_RISCI1 (1 << 2)
#define AUD_INT_DN_RISCI2 (1 << 4) /* yes, 3 is skipped */
#define AUD_INT_UP_RISCI2 (1 << 5)
#define AUD_INT_RDS_DN_RISCI2 (1 << 6)
#define AUD_INT_DN_SYNC (1 << 12)
#define AUD_INT_UP_SYNC (1 << 13)
#define AUD_INT_RDS_DN_SYNC (1 << 14)
#define AUD_INT_OPC_ERR (1 << 16)
#define AUD_INT_BER_IRQ (1 << 20)
#define AUD_INT_MCHG_IRQ (1 << 21)
#define GP_COUNT_CONTROL_RESET 0x3
static int cx23885_alsa_dma_init(struct cx23885_audio_dev *chip,
unsigned long nr_pages)
{
struct cx23885_audio_buffer *buf = chip->buf;
struct page *pg;
int i;
buf->vaddr = vmalloc_32(nr_pages << PAGE_SHIFT);
if (NULL == buf->vaddr) {
dprintk(1, "vmalloc_32(%lu pages) failed\n", nr_pages);
return -ENOMEM;
}
dprintk(1, "vmalloc is at addr %p, size=%lu\n",
buf->vaddr, nr_pages << PAGE_SHIFT);
memset(buf->vaddr, 0, nr_pages << PAGE_SHIFT);
buf->nr_pages = nr_pages;
buf->sglist = vzalloc(array_size(sizeof(*buf->sglist), buf->nr_pages));
if (NULL == buf->sglist)
goto vzalloc_err;
sg_init_table(buf->sglist, buf->nr_pages);
for (i = 0; i < buf->nr_pages; i++) {
pg = vmalloc_to_page(buf->vaddr + i * PAGE_SIZE);
if (NULL == pg)
goto vmalloc_to_page_err;
sg_set_page(&buf->sglist[i], pg, PAGE_SIZE, 0);
}
return 0;
vmalloc_to_page_err:
vfree(buf->sglist);
buf->sglist = NULL;
vzalloc_err:
vfree(buf->vaddr);
buf->vaddr = NULL;
return -ENOMEM;
}
static int cx23885_alsa_dma_map(struct cx23885_audio_dev *dev)
{
struct cx23885_audio_buffer *buf = dev->buf;
buf->sglen = dma_map_sg(&dev->pci->dev, buf->sglist,
buf->nr_pages, DMA_FROM_DEVICE);
if (0 == buf->sglen) {
pr_warn("%s: cx23885_alsa_map_sg failed\n", __func__);
return -ENOMEM;
}
return 0;
}
static int cx23885_alsa_dma_unmap(struct cx23885_audio_dev *dev)
{
struct cx23885_audio_buffer *buf = dev->buf;
if (!buf->sglen)
return 0;
dma_unmap_sg(&dev->pci->dev, buf->sglist, buf->nr_pages, DMA_FROM_DEVICE);
buf->sglen = 0;
return 0;
}
static int cx23885_alsa_dma_free(struct cx23885_audio_buffer *buf)
{
vfree(buf->sglist);
buf->sglist = NULL;
vfree(buf->vaddr);
buf->vaddr = NULL;
return 0;
}
/*
* BOARD Specific: Sets audio DMA
*/
static int cx23885_start_audio_dma(struct cx23885_audio_dev *chip)
{
struct cx23885_audio_buffer *buf = chip->buf;
struct cx23885_dev *dev = chip->dev;
struct sram_channel *audio_ch =
&dev->sram_channels[AUDIO_SRAM_CHANNEL];
dprintk(1, "%s()\n", __func__);
/* Make sure RISC/FIFO are off before changing FIFO/RISC settings */
cx_clear(AUD_INT_DMA_CTL, 0x11);
/* setup fifo + format - out channel */
cx23885_sram_channel_setup(chip->dev, audio_ch, buf->bpl,
buf->risc.dma);
/* sets bpl size */
cx_write(AUD_INT_A_LNGTH, buf->bpl);
/* This is required to get good audio (1 seems to be ok) */
cx_write(AUD_INT_A_MODE, 1);
/* reset counter */
cx_write(AUD_INT_A_GPCNT_CTL, 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+12)>>1,
chip->num_periods, buf->bpl * chip->num_periods);
/* Enables corresponding bits at AUD_INT_STAT */
cx_write(AUDIO_INT_INT_MSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC |
AUD_INT_DN_RISCI1);
/* Clean any pending interrupt bits already set */
cx_write(AUDIO_INT_INT_STAT, ~0);
/* enable audio irqs */
cx_set(PCI_INT_MSK, chip->dev->pci_irqmask | PCI_MSK_AUD_INT);
/* start dma */
cx_set(DEV_CNTRL2, (1<<5)); /* Enables Risc Processor */
cx_set(AUD_INT_DMA_CTL, 0x11); /* audio downstream FIFO and
RISC enable */
if (audio_debug)
cx23885_sram_channel_dump(chip->dev, audio_ch);
return 0;
}
/*
* BOARD Specific: Resets audio DMA
*/
static int cx23885_stop_audio_dma(struct cx23885_audio_dev *chip)
{
struct cx23885_dev *dev = chip->dev;
dprintk(1, "Stopping audio DMA\n");
/* stop dma */
cx_clear(AUD_INT_DMA_CTL, 0x11);
/* disable irqs */
cx_clear(PCI_INT_MSK, PCI_MSK_AUD_INT);
cx_clear(AUDIO_INT_INT_MSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC |
AUD_INT_DN_RISCI1);
if (audio_debug)
cx23885_sram_channel_dump(chip->dev,
&dev->sram_channels[AUDIO_SRAM_CHANNEL]);
return 0;
}
/*
* BOARD Specific: Handles audio IRQ
*/
int cx23885_audio_irq(struct cx23885_dev *dev, u32 status, u32 mask)
{
struct cx23885_audio_dev *chip = dev->audio_dev;
if (0 == (status & mask))
return 0;
cx_write(AUDIO_INT_INT_STAT, status);
/* risc op code error */
if (status & AUD_INT_OPC_ERR) {
pr_warn("%s/1: Audio risc op code error\n",
dev->name);
cx_clear(AUD_INT_DMA_CTL, 0x11);
cx23885_sram_channel_dump(dev,
&dev->sram_channels[AUDIO_SRAM_CHANNEL]);
}
if (status & AUD_INT_DN_SYNC) {
dprintk(1, "Downstream sync error\n");
cx_write(AUD_INT_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET);
return 1;
}
/* risc1 downstream */
if (status & AUD_INT_DN_RISCI1) {
atomic_set(&chip->count, cx_read(AUD_INT_A_GPCNT));
snd_pcm_period_elapsed(chip->substream);
}
/* FIXME: Any other status should deserve a special handling? */
return 1;
}
static int dsp_buffer_free(struct cx23885_audio_dev *chip)
{
struct cx23885_riscmem *risc;
BUG_ON(!chip->dma_size);
dprintk(2, "Freeing buffer\n");
cx23885_alsa_dma_unmap(chip);
cx23885_alsa_dma_free(chip->buf);
risc = &chip->buf->risc;
dma_free_coherent(&chip->pci->dev, risc->size, risc->cpu, risc->dma);
kfree(chip->buf);
chip->buf = NULL;
chip->dma_size = 0;
return 0;
}
/****************************************************************************
ALSA PCM Interface
****************************************************************************/
/*
* Digital hardware definition
*/
#define DEFAULT_FIFO_SIZE 4096
static const struct snd_pcm_hardware snd_cx23885_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_cx23885_pcm_open(struct snd_pcm_substream *substream)
{
struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream);
struct snd_pcm_runtime *runtime = substream->runtime;
int err;
if (!chip) {
pr_err("BUG: cx23885 can't find device struct. Can't proceed with open\n");
return -ENODEV;
}
err = snd_pcm_hw_constraint_pow2(runtime, 0,
SNDRV_PCM_HW_PARAM_PERIODS);
if (err < 0)
goto _error;
chip->substream = substream;
runtime->hw = snd_cx23885_digital_hw;
if (chip->dev->sram_channels[AUDIO_SRAM_CHANNEL].fifo_size !=
DEFAULT_FIFO_SIZE) {
unsigned int bpl = chip->dev->
sram_channels[AUDIO_SRAM_CHANNEL].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_cx23885_close(struct snd_pcm_substream *substream)
{
return 0;
}
/*
* hw_params callback
*/
static int snd_cx23885_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
{
struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream);
struct cx23885_audio_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 = kzalloc(sizeof(*buf), GFP_KERNEL);
if (NULL == buf)
return -ENOMEM;
buf->bpl = chip->period_size;
chip->buf = buf;
ret = cx23885_alsa_dma_init(chip,
(PAGE_ALIGN(chip->dma_size) >> PAGE_SHIFT));
if (ret < 0)
goto error;
ret = cx23885_alsa_dma_map(chip);
if (ret < 0)
goto error;
ret = cx23885_risc_databuffer(chip->pci, &buf->risc, buf->sglist,
chip->period_size, chip->num_periods, 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->risc.jmp[2] = cpu_to_le32(0); /* bits 63-32 */
substream->runtime->dma_area = chip->buf->vaddr;
substream->runtime->dma_bytes = chip->dma_size;
substream->runtime->dma_addr = 0;
return 0;
error:
kfree(buf);
chip->buf = NULL;
return ret;
}
/*
* hw free callback
*/
static int snd_cx23885_hw_free(struct snd_pcm_substream *substream)
{
struct cx23885_audio_dev *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_cx23885_prepare(struct snd_pcm_substream *substream)
{
return 0;
}
/*
* trigger callback
*/
static int snd_cx23885_card_trigger(struct snd_pcm_substream *substream,
int cmd)
{
struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream);
int err;
/* Local interrupts are already disabled by ALSA */
spin_lock(&chip->lock);
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
err = cx23885_start_audio_dma(chip);
break;
case SNDRV_PCM_TRIGGER_STOP:
err = cx23885_stop_audio_dma(chip);
break;
default:
err = -EINVAL;
break;
}
spin_unlock(&chip->lock);
return err;
}
/*
* pointer callback
*/
static snd_pcm_uframes_t snd_cx23885_pointer(
struct snd_pcm_substream *substream)
{
struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream);
struct snd_pcm_runtime *runtime = substream->runtime;
u16 count;
count = atomic_read(&chip->count);
return runtime->period_size * (count & (runtime->periods-1));
}
/*
* page callback (needed for mmap)
*/
static struct page *snd_cx23885_page(struct snd_pcm_substream *substream,
unsigned long offset)
{
void *pageptr = substream->runtime->dma_area + offset;
return vmalloc_to_page(pageptr);
}
/*
* operators
*/
static const struct snd_pcm_ops snd_cx23885_pcm_ops = {
.open = snd_cx23885_pcm_open,
.close = snd_cx23885_close,
.hw_params = snd_cx23885_hw_params,
.hw_free = snd_cx23885_hw_free,
.prepare = snd_cx23885_prepare,
.trigger = snd_cx23885_card_trigger,
.pointer = snd_cx23885_pointer,
.page = snd_cx23885_page,
};
/*
* create a PCM device
*/
static int snd_cx23885_pcm(struct cx23885_audio_dev *chip, int device,
char *name)
{
int err;
struct snd_pcm *pcm;
err = snd_pcm_new(chip->card, name, device, 0, 1, &pcm);
if (err < 0)
return err;
pcm->private_data = chip;
strscpy(pcm->name, name, sizeof(pcm->name));
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_cx23885_pcm_ops);
return 0;
}
/****************************************************************************
Basic Flow for Sound Devices
****************************************************************************/
/*
* Alsa Constructor - Component probe
*/
struct cx23885_audio_dev *cx23885_audio_register(struct cx23885_dev *dev)
{
struct snd_card *card;
struct cx23885_audio_dev *chip;
int err;
if (disable_analog_audio)
return NULL;
if (dev->sram_channels[AUDIO_SRAM_CHANNEL].cmds_start == 0) {
pr_warn("%s(): Missing SRAM channel configuration for analog TV Audio\n",
__func__);
return NULL;
}
err = snd_card_new(&dev->pci->dev,
SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
THIS_MODULE, sizeof(struct cx23885_audio_dev), &card);
if (err < 0)
goto error_msg;
chip = (struct cx23885_audio_dev *) card->private_data;
chip->dev = dev;
chip->pci = dev->pci;
chip->card = card;
spin_lock_init(&chip->lock);
err = snd_cx23885_pcm(chip, 0, "CX23885 Digital");
if (err < 0)
goto error;
strscpy(card->driver, "CX23885", sizeof(card->driver));
sprintf(card->shortname, "Conexant CX23885");
sprintf(card->longname, "%s at %s", card->shortname, dev->name);
err = snd_card_register(card);
if (err < 0)
goto error;
dprintk(0, "registered ALSA audio device\n");
return chip;
error:
snd_card_free(card);
error_msg:
pr_err("%s(): Failed to register analog audio adapter\n",
__func__);
return NULL;
}
/*
* ALSA destructor
*/
void cx23885_audio_unregister(struct cx23885_dev *dev)
{
struct cx23885_audio_dev *chip = dev->audio_dev;
snd_card_free(chip->card);
}