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satip-axe/kernel/sound/stm/pcm_reader.c

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/*
* STMicroelectronics System-on-Chips' PCM reader driver
*
* Copyright (c) 2005-2011 STMicroelectronics Limited
*
* Author: Pawel Moll <pawel.moll@st.com>
*
* 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 <linux/init.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <asm/cacheflush.h>
#include <linux/stm/pad.h>
#include <linux/stm/stm-dma.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/control.h>
#include <sound/info.h>
#include <sound/pcm_params.h>
#include "common.h"
#include "reg_aud_pcmin.h"
static int snd_stm_debug_level;
module_param_named(debug, snd_stm_debug_level, int, S_IRUGO | S_IWUSR);
/*
* Some hardware-related definitions
*/
#define DEFAULT_FORMAT (SND_STM_FORMAT__I2S | \
SND_STM_FORMAT__SUBFRAME_32_BITS)
/*
* PCM reader instance definition
*/
struct snd_stm_pcm_reader {
/* System informations */
struct snd_stm_pcm_reader_info *info;
struct device *device;
struct snd_pcm *pcm;
int ver; /* IP version, used by register access macros */
/* Resources */
struct resource *mem_region;
void *base;
unsigned long fifo_phys_address;
unsigned int irq;
int fdma_channel;
/* Environment settings */
struct snd_pcm_hw_constraint_list channels_constraint;
struct snd_stm_conv_source *conv_source;
/* Runtime data */
struct snd_stm_conv_group *conv_group;
struct snd_stm_buffer *buffer;
struct snd_info_entry *proc_entry;
struct snd_pcm_substream *substream;
int fdma_max_transfer_size;
struct stm_dma_params *fdma_params_list;
struct stm_dma_req *fdma_request;
int running;
struct stm_pad_state *pads;
snd_stm_magic_field;
};
/*
* Capturing engine implementation
*/
static irqreturn_t snd_stm_pcm_reader_irq_handler(int irq, void *dev_id)
{
irqreturn_t result = IRQ_NONE;
struct snd_stm_pcm_reader *pcm_reader = dev_id;
unsigned int status;
snd_stm_printd(2, "snd_stm_pcm_reader_irq_handler(irq=%d, "
"dev_id=0x%p)\n", irq, dev_id);
BUG_ON(!pcm_reader);
BUG_ON(!snd_stm_magic_valid(pcm_reader));
/* Get interrupt status & clear them immediately */
preempt_disable();
status = get__AUD_PCMIN_ITS(pcm_reader);
set__AUD_PCMIN_ITS_CLR(pcm_reader, status);
preempt_enable();
/* Overflow? */
if (unlikely(status & mask__AUD_PCMIN_ITS__OVF__PENDING(pcm_reader))) {
snd_stm_printe("Overflow detected in PCM reader '%s'!\n",
dev_name(pcm_reader->device));
snd_pcm_stop(pcm_reader->substream, SNDRV_PCM_STATE_XRUN);
result = IRQ_HANDLED;
}
/* Some alien interrupt??? */
BUG_ON(result != IRQ_HANDLED);
return result;
}
static void snd_stm_pcm_reader_callback_node_done(unsigned long param)
{
struct snd_stm_pcm_reader *pcm_reader =
(struct snd_stm_pcm_reader *)param;
snd_stm_printd(2, "snd_stm_pcm_reader_callback_node_done(param=0x%lx"
")\n", param);
BUG_ON(!pcm_reader);
BUG_ON(!snd_stm_magic_valid(pcm_reader));
if (!pcm_reader->running)
return;
snd_stm_printd(2, "Period elapsed ('%s')\n",
dev_name(pcm_reader->device));
snd_pcm_period_elapsed(pcm_reader->substream);
}
static void snd_stm_pcm_reader_callback_node_error(unsigned long param)
{
struct snd_stm_pcm_reader *pcm_reader =
(struct snd_stm_pcm_reader *)param;
snd_stm_printd(2, "snd_stm_pcm_reader_callback_node_error(param=0x%lx"
")\n", param);
BUG_ON(!pcm_reader);
BUG_ON(!snd_stm_magic_valid(pcm_reader));
if (!pcm_reader->running)
return;
snd_stm_printe("Error during FDMA transfer in reader '%s'!\n",
dev_name(pcm_reader->device));
snd_pcm_stop(pcm_reader->substream, SNDRV_PCM_STATE_XRUN);
}
static struct snd_pcm_hardware snd_stm_pcm_reader_hw = {
.info = (SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_MMAP_VALID |
SNDRV_PCM_INFO_INTERLEAVED |
SNDRV_PCM_INFO_BLOCK_TRANSFER),
.formats = (SNDRV_PCM_FMTBIT_S32_LE),
/* Keep in mind that we are working in slave mode, so sampling
* rate is determined by external components... */
.rates = SNDRV_PCM_RATE_CONTINUOUS,
.rate_min = 32000,
.rate_max = 192000,
.channels_min = 2,
.channels_max = 10,
.periods_min = 2,
.periods_max = 1024, /* TODO: sample, work out this somehow... */
/* Values below were worked out mostly basing on ST media player
* requirements. They should, however, fit most "normal" cases...
* Note: period_bytes_min defines minimum time between FDMA transfer
* interrupts... Keep it large enough not to kill the system... */
.period_bytes_min = 4096, /* 1024 frames @ 32kHz, 16 bits, 2 ch. */
.period_bytes_max = 81920, /* 2048 frames @ 192kHz, 32 bits, 10 ch. */
.buffer_bytes_max = 81920 * 3, /* 3 worst-case-periods */
};
static int snd_stm_pcm_reader_open(struct snd_pcm_substream *substream)
{
int result;
struct snd_stm_pcm_reader *pcm_reader =
snd_pcm_substream_chip(substream);
struct snd_pcm_runtime *runtime = substream->runtime;
snd_stm_printd(1, "snd_stm_pcm_reader_open(substream=0x%p)\n",
substream);
BUG_ON(!pcm_reader);
BUG_ON(!snd_stm_magic_valid(pcm_reader));
BUG_ON(!runtime);
snd_pcm_set_sync(substream); /* TODO: ??? */
/* Get attached converters handle */
pcm_reader->conv_group =
snd_stm_conv_request_group(pcm_reader->conv_source);
if (pcm_reader->conv_group)
snd_stm_printd(1, "'%s' is attached to '%s' converter(s)...\n",
dev_name(pcm_reader->device),
snd_stm_conv_get_name(pcm_reader->conv_group));
else
snd_stm_printd(1, "No converter attached to '%s'!\n",
dev_name(pcm_reader->device));
/* Set up constraints & pass hardware capabilities info to ALSA */
result = snd_pcm_hw_constraint_list(runtime, 0,
SNDRV_PCM_HW_PARAM_CHANNELS,
&pcm_reader->channels_constraint);
if (result < 0) {
snd_stm_printe("Can't set channels constraint!\n");
return result;
}
/* Buffer size must be an integer multiple of a period size to use
* FDMA nodes as periods... Such thing will ensure this :-O */
result = snd_pcm_hw_constraint_integer(runtime,
SNDRV_PCM_HW_PARAM_PERIODS);
if (result < 0) {
snd_stm_printe("Can't set periods constraint!\n");
return result;
}
/* Make the period (so buffer as well) length (in bytes) a multiply
* of a FDMA transfer bytes (which varies depending on channels
* number and sample bytes) */
result = snd_stm_pcm_hw_constraint_transfer_bytes(runtime,
pcm_reader->fdma_max_transfer_size * 4);
if (result < 0) {
snd_stm_printe("Can't set buffer bytes constraint!\n");
return result;
}
runtime->hw = snd_stm_pcm_reader_hw;
/* Interrupt handlers will need the substream pointer... */
pcm_reader->substream = substream;
return 0;
}
static int snd_stm_pcm_reader_close(struct snd_pcm_substream *substream)
{
struct snd_stm_pcm_reader *pcm_reader =
snd_pcm_substream_chip(substream);
snd_stm_printd(1, "snd_stm_pcm_reader_close(substream=0x%p)\n",
substream);
BUG_ON(!pcm_reader);
BUG_ON(!snd_stm_magic_valid(pcm_reader));
if (pcm_reader->conv_group) {
snd_stm_conv_release_group(pcm_reader->conv_group);
pcm_reader->conv_group = NULL;
}
pcm_reader->substream = NULL;
return 0;
}
static int snd_stm_pcm_reader_hw_free(struct snd_pcm_substream *substream)
{
struct snd_stm_pcm_reader *pcm_reader =
snd_pcm_substream_chip(substream);
struct snd_pcm_runtime *runtime = substream->runtime;
snd_stm_printd(1, "snd_stm_pcm_reader_hw_free(substream=0x%p)\n",
substream);
BUG_ON(!pcm_reader);
BUG_ON(!snd_stm_magic_valid(pcm_reader));
BUG_ON(!runtime);
/* This callback may be called more than once... */
if (snd_stm_buffer_is_allocated(pcm_reader->buffer)) {
/* Let the FDMA stop */
dma_wait_for_completion(pcm_reader->fdma_channel);
/* Free buffer */
snd_stm_buffer_free(pcm_reader->buffer);
/* Free FDMA parameters (whole list) */
dma_params_free(pcm_reader->fdma_params_list);
dma_req_free(pcm_reader->fdma_channel,
pcm_reader->fdma_request);
kfree(pcm_reader->fdma_params_list);
}
return 0;
}
static int snd_stm_pcm_reader_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
{
int result;
struct snd_stm_pcm_reader *pcm_reader =
snd_pcm_substream_chip(substream);
struct snd_pcm_runtime *runtime = substream->runtime;
int buffer_bytes, period_bytes, periods, frame_bytes, transfer_bytes;
unsigned int transfer_size;
struct stm_dma_req_config fdma_req_config = {
.rw = REQ_CONFIG_READ,
.opcode = REQ_CONFIG_OPCODE_4,
.increment = 0,
.hold_off = 0,
.initiator = pcm_reader->info->fdma_initiator,
};
int i;
snd_stm_printd(1, "snd_stm_pcm_reader_hw_params(substream=0x%p,"
" hw_params=0x%p)\n", substream, hw_params);
BUG_ON(!pcm_reader);
BUG_ON(!snd_stm_magic_valid(pcm_reader));
BUG_ON(!runtime);
/* This function may be called many times, so let's be prepared... */
if (snd_stm_buffer_is_allocated(pcm_reader->buffer))
snd_stm_pcm_reader_hw_free(substream);
/* Get the numbers... */
buffer_bytes = params_buffer_bytes(hw_params);
periods = params_periods(hw_params);
period_bytes = buffer_bytes / periods;
BUG_ON(periods * period_bytes != buffer_bytes);
/* Allocate buffer */
result = snd_stm_buffer_alloc(pcm_reader->buffer, substream,
buffer_bytes);
if (result != 0) {
snd_stm_printe("Can't allocate %d bytes buffer for '%s'!\n",
buffer_bytes, dev_name(pcm_reader->device));
result = -ENOMEM;
goto error_buf_alloc;
}
/* Set FDMA transfer size (number of opcodes generated
* after request line assertion) */
frame_bytes = snd_pcm_format_physical_width(params_format(hw_params)) *
params_channels(hw_params) / 8;
transfer_bytes = snd_stm_pcm_transfer_bytes(frame_bytes,
pcm_reader->fdma_max_transfer_size * 4);
transfer_size = transfer_bytes / 4;
snd_stm_printd(1, "FDMA request trigger limit set to %d.\n",
transfer_size);
BUG_ON(buffer_bytes % transfer_bytes != 0);
BUG_ON(transfer_size > pcm_reader->fdma_max_transfer_size);
if (pcm_reader->ver > 3) {
BUG_ON(transfer_size != 1 && transfer_size % 2 == 0);
BUG_ON(transfer_size >
mask__AUD_PCMIN_FMT__DMA_REQ_TRIG_LMT(pcm_reader));
set__AUD_PCMIN_FMT__DMA_REQ_TRIG_LMT(pcm_reader, transfer_size);
set__AUD_PCMIN_FMT__BACK_STALLING__DISABLED(pcm_reader);
/* This is a workaround for a problem in early releases
* of multi-channel PCM Readers with FIFO underrunning (!!!),
* caused by spurious request line generation... */
if (pcm_reader->ver < 6 && transfer_size > 2)
fdma_req_config.count = transfer_size / 2;
else
fdma_req_config.count = transfer_size;
} else {
fdma_req_config.count = transfer_size;
}
snd_stm_printd(1, "FDMA transfer size set to %d.\n",
fdma_req_config.count);
/* Configure FDMA transfer */
pcm_reader->fdma_request = dma_req_config(pcm_reader->fdma_channel,
pcm_reader->info->fdma_request_line, &fdma_req_config);
if (!pcm_reader->fdma_request) {
snd_stm_printe("Can't configure FDMA pacing channel for player"
" '%s'!\n", dev_name(pcm_reader->device));
result = -EINVAL;
goto error_req_config;
}
pcm_reader->fdma_params_list =
kmalloc(sizeof(*pcm_reader->fdma_params_list) *
periods, GFP_KERNEL);
if (!pcm_reader->fdma_params_list) {
snd_stm_printe("Can't allocate %d bytes for FDMA parameters "
"list!\n", sizeof(*pcm_reader->fdma_params_list)
* periods);
result = -ENOMEM;
goto error_params_alloc;
}
snd_stm_printd(1, "Configuring FDMA transfer nodes:\n");
for (i = 0; i < periods; i++) {
dma_params_init(&pcm_reader->fdma_params_list[i], MODE_PACED,
STM_DMA_LIST_CIRC);
if (i > 0)
dma_params_link(&pcm_reader->fdma_params_list[i - 1],
(&pcm_reader->fdma_params_list[i]));
dma_params_comp_cb(&pcm_reader->fdma_params_list[i],
snd_stm_pcm_reader_callback_node_done,
(unsigned long)pcm_reader,
STM_DMA_CB_CONTEXT_ISR);
dma_params_err_cb(&pcm_reader->fdma_params_list[i],
snd_stm_pcm_reader_callback_node_error,
(unsigned long)pcm_reader,
STM_DMA_CB_CONTEXT_ISR);
/* Get callback every time a node is completed */
dma_params_interrupts(&pcm_reader->fdma_params_list[i],
STM_DMA_NODE_COMP_INT);
dma_params_DIM_0_x_1(&pcm_reader->fdma_params_list[i]);
dma_params_req(&pcm_reader->fdma_params_list[i],
pcm_reader->fdma_request);
snd_stm_printd(1, "- %d: %d bytes from 0x%08x\n", i,
period_bytes,
runtime->dma_addr + i * period_bytes);
dma_params_addrs(&pcm_reader->fdma_params_list[i],
pcm_reader->fifo_phys_address,
runtime->dma_addr + i * period_bytes,
period_bytes);
}
result = dma_compile_list(pcm_reader->fdma_channel,
pcm_reader->fdma_params_list, GFP_KERNEL);
if (result < 0) {
snd_stm_printe("Can't compile FDMA parameters for"
" reader '%s'!\n", dev_name(pcm_reader->device));
goto error_compile_list;
}
return 0;
error_compile_list:
kfree(pcm_reader->fdma_params_list);
error_params_alloc:
dma_req_free(pcm_reader->fdma_channel,
pcm_reader->fdma_request);
error_req_config:
snd_stm_buffer_free(pcm_reader->buffer);
error_buf_alloc:
return result;
}
static int snd_stm_pcm_reader_prepare(struct snd_pcm_substream *substream)
{
struct snd_stm_pcm_reader *pcm_reader =
snd_pcm_substream_chip(substream);
struct snd_pcm_runtime *runtime = substream->runtime;
unsigned int format, lr_pol;
snd_stm_printd(1, "snd_stm_pcm_reader_prepare(substream=0x%p)\n",
substream);
BUG_ON(!pcm_reader);
BUG_ON(!snd_stm_magic_valid(pcm_reader));
BUG_ON(!runtime);
/* Get format value from connected converter */
if (pcm_reader->conv_group)
format = snd_stm_conv_get_format(pcm_reader->conv_group);
else
format = DEFAULT_FORMAT;
/* Number of bits per subframe (which is one channel sample)
* on input. */
switch (format & SND_STM_FORMAT__SUBFRAME_MASK) {
case SND_STM_FORMAT__SUBFRAME_32_BITS:
snd_stm_printd(1, "- 32 bits per subframe\n");
set__AUD_PCMIN_FMT__NBIT__32_BITS(pcm_reader);
set__AUD_PCMIN_FMT__DATA_SIZE__24_BITS(pcm_reader);
break;
case SND_STM_FORMAT__SUBFRAME_16_BITS:
snd_stm_printd(1, "- 16 bits per subframe\n");
set__AUD_PCMIN_FMT__NBIT__16_BITS(pcm_reader);
set__AUD_PCMIN_FMT__DATA_SIZE__16_BITS(pcm_reader);
break;
default:
snd_BUG();
return -EINVAL;
}
/* Serial audio interface format -
* for detailed explanation see ie.
* http://www.cirrus.com/en/pubs/appNote/AN282REV1.pdf */
set__AUD_PCMIN_FMT__ORDER__MSB_FIRST(pcm_reader);
set__AUD_PCMIN_FMT__SCLK_EDGE__RISING(pcm_reader);
switch (format & SND_STM_FORMAT__MASK) {
case SND_STM_FORMAT__I2S:
snd_stm_printd(1, "- I2S\n");
set__AUD_PCMIN_FMT__ALIGN__LEFT(pcm_reader);
set__AUD_PCMIN_FMT__PADDING__1_CYCLE_DELAY(pcm_reader);
lr_pol = value__AUD_PCMIN_FMT__LR_POL__LEFT_LOW(pcm_reader);
break;
case SND_STM_FORMAT__LEFT_JUSTIFIED:
snd_stm_printd(1, "- left justified\n");
set__AUD_PCMIN_FMT__ALIGN__LEFT(pcm_reader);
set__AUD_PCMIN_FMT__PADDING__NO_DELAY(pcm_reader);
lr_pol = value__AUD_PCMIN_FMT__LR_POL__LEFT_HIGH(pcm_reader);
break;
case SND_STM_FORMAT__RIGHT_JUSTIFIED:
snd_stm_printd(1, "- right justified\n");
set__AUD_PCMIN_FMT__ALIGN__RIGHT(pcm_reader);
set__AUD_PCMIN_FMT__PADDING__NO_DELAY(pcm_reader);
lr_pol = value__AUD_PCMIN_FMT__LR_POL__LEFT_HIGH(pcm_reader);
break;
default:
snd_BUG();
return -EINVAL;
}
/* Configure data memory format */
switch (runtime->format) {
case SNDRV_PCM_FORMAT_S32_LE:
/* Actually "16 bits/0 bits" means "24/20/18/16 bits on the
* left than zeros"... ;-) */
set__AUD_PCMIN_CTRL__MEM_FMT__16_BITS_0_BITS(pcm_reader);
/* In x/0 bits memory mode there is no problem with
* L/R polarity */
set__AUD_PCMIN_FMT__LR_POL(pcm_reader, lr_pol);
break;
default:
snd_BUG();
return -EINVAL;
}
/* Number of channels... */
BUG_ON(runtime->channels % 2 != 0);
BUG_ON(runtime->channels < 2);
BUG_ON(runtime->channels > 10);
if (pcm_reader->ver > 3)
set__AUD_PCMIN_FMT__NUM_CH(pcm_reader, runtime->channels / 2);
return 0;
}
static int snd_stm_pcm_reader_start(struct snd_pcm_substream *substream)
{
int result;
struct snd_stm_pcm_reader *pcm_reader =
snd_pcm_substream_chip(substream);
snd_stm_printd(1, "snd_stm_pcm_reader_start(substream=0x%p)\n",
substream);
BUG_ON(!pcm_reader);
BUG_ON(!snd_stm_magic_valid(pcm_reader));
/* Un-reset PCM reader */
set__AUD_PCMIN_RST__RSTP__RUNNING(pcm_reader);
/* Launch FDMA transfer */
result = dma_xfer_list(pcm_reader->fdma_channel,
pcm_reader->fdma_params_list);
if (result != 0) {
snd_stm_printe("Can't launch FDMA transfer for reader '%s'!\n",
dev_name(pcm_reader->device));
return -EINVAL;
}
while (dma_get_status(pcm_reader->fdma_channel) !=
DMA_CHANNEL_STATUS_RUNNING)
udelay(5);
/* Enable required reader interrupt (and clear possible stalled) */
enable_irq(pcm_reader->irq);
set__AUD_PCMIN_ITS_CLR__OVF__CLEAR(pcm_reader);
set__AUD_PCMIN_IT_EN_SET__OVF__SET(pcm_reader);
/* Launch the reader */
set__AUD_PCMIN_CTRL__MODE__PCM(pcm_reader);
/* Wake up & unmute ADC */
if (pcm_reader->conv_group) {
snd_stm_conv_enable(pcm_reader->conv_group,
0, substream->runtime->channels - 1);
snd_stm_conv_unmute(pcm_reader->conv_group);
}
pcm_reader->running = 1;
return 0;
}
static int snd_stm_pcm_reader_stop(struct snd_pcm_substream *substream)
{
struct snd_stm_pcm_reader *pcm_reader =
snd_pcm_substream_chip(substream);
snd_stm_printd(1, "snd_stm_pcm_reader_stop(substream=0x%p)\n",
substream);
BUG_ON(!pcm_reader);
BUG_ON(!snd_stm_magic_valid(pcm_reader));
pcm_reader->running = 0;
/* Mute & shutdown DAC */
if (pcm_reader->conv_group) {
snd_stm_conv_mute(pcm_reader->conv_group);
snd_stm_conv_disable(pcm_reader->conv_group);
}
/* Disable interrupts */
set__AUD_PCMIN_IT_EN_CLR__OVF__CLEAR(pcm_reader);
disable_irq_nosync(pcm_reader->irq);
/* Stop PCM reader */
set__AUD_PCMIN_CTRL__MODE__OFF(pcm_reader);
/* Stop FDMA transfer */
dma_stop_channel(pcm_reader->fdma_channel);
/* Reset PCM reader */
set__AUD_PCMIN_RST__RSTP__RESET(pcm_reader);
return 0;
}
static int snd_stm_pcm_reader_trigger(struct snd_pcm_substream *substream,
int command)
{
snd_stm_printd(1, "snd_stm_pcm_reader_trigger(substream=0x%p,"
"command=%d)\n", substream, command);
switch (command) {
case SNDRV_PCM_TRIGGER_START:
return snd_stm_pcm_reader_start(substream);
case SNDRV_PCM_TRIGGER_STOP:
return snd_stm_pcm_reader_stop(substream);
default:
return -EINVAL;
}
}
static snd_pcm_uframes_t snd_stm_pcm_reader_pointer(struct snd_pcm_substream
*substream)
{
struct snd_stm_pcm_reader *pcm_reader =
snd_pcm_substream_chip(substream);
struct snd_pcm_runtime *runtime = substream->runtime;
int residue, hwptr;
snd_pcm_uframes_t pointer;
snd_stm_printd(2, "snd_stm_pcm_reader_pointer(substream=0x%p)\n",
substream);
BUG_ON(!pcm_reader);
BUG_ON(!snd_stm_magic_valid(pcm_reader));
BUG_ON(!runtime);
residue = get_dma_residue(pcm_reader->fdma_channel);
hwptr = (runtime->dma_bytes - residue) % runtime->dma_bytes;
pointer = bytes_to_frames(runtime, hwptr);
snd_stm_printd(2, "FDMA residue value is %i and buffer size is %u"
" bytes...\n", residue, runtime->dma_bytes);
snd_stm_printd(2, "... so HW pointer in frames is %lu (0x%lx)!\n",
pointer, pointer);
return pointer;
}
static struct snd_pcm_ops snd_stm_pcm_reader_pcm_ops = {
.open = snd_stm_pcm_reader_open,
.close = snd_stm_pcm_reader_close,
.mmap = snd_stm_buffer_mmap,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = snd_stm_pcm_reader_hw_params,
.hw_free = snd_stm_pcm_reader_hw_free,
.prepare = snd_stm_pcm_reader_prepare,
.trigger = snd_stm_pcm_reader_trigger,
.pointer = snd_stm_pcm_reader_pointer,
};
/*
* ALSA lowlevel device implementation
*/
#define DUMP_REGISTER(r) \
snd_iprintf(buffer, "AUD_PCMIN_%s (offset 0x%02x) = 0x%08x\n", \
__stringify(r), \
offset__AUD_PCMIN_##r(pcm_reader), \
get__AUD_PCMIN_##r(pcm_reader))
static void snd_stm_pcm_reader_dump_registers(struct snd_info_entry *entry,
struct snd_info_buffer *buffer)
{
struct snd_stm_pcm_reader *pcm_reader = entry->private_data;
BUG_ON(!pcm_reader);
BUG_ON(!snd_stm_magic_valid(pcm_reader));
snd_iprintf(buffer, "--- %s ---\n", dev_name(pcm_reader->device));
snd_iprintf(buffer, "base = 0x%p\n", pcm_reader->base);
DUMP_REGISTER(RST);
DUMP_REGISTER(DATA);
DUMP_REGISTER(ITS);
DUMP_REGISTER(ITS_CLR);
DUMP_REGISTER(IT_EN);
DUMP_REGISTER(IT_EN_SET);
DUMP_REGISTER(IT_EN_CLR);
DUMP_REGISTER(CTRL);
DUMP_REGISTER(STA);
DUMP_REGISTER(FMT);
snd_iprintf(buffer, "\n");
}
static int snd_stm_pcm_reader_register(struct snd_device *snd_device)
{
struct snd_stm_pcm_reader *pcm_reader = snd_device->device_data;
snd_stm_printd(1, "%s(snd_device=0x%p)\n", __func__, snd_device);
BUG_ON(!pcm_reader);
BUG_ON(!snd_stm_magic_valid(pcm_reader));
/* Set reset mode */
set__AUD_PCMIN_RST__RSTP__RESET(pcm_reader);
/* TODO: well, hardcoded - shall anyone use it?
* And what does it actually mean? */
set__AUD_PCMIN_CTRL__RND__NO_ROUNDING(pcm_reader);
/* Registers view in ALSA's procfs */
snd_stm_info_register(&pcm_reader->proc_entry,
dev_name(pcm_reader->device),
snd_stm_pcm_reader_dump_registers, pcm_reader);
return 0;
}
static int snd_stm_pcm_reader_disconnect(struct snd_device *snd_device)
{
struct snd_stm_pcm_reader *pcm_reader = snd_device->device_data;
snd_stm_printd(1, "%s(snd_device=0x%p)\n", __func__, snd_device);
BUG_ON(!pcm_reader);
BUG_ON(!snd_stm_magic_valid(pcm_reader));
snd_stm_info_unregister(pcm_reader->proc_entry);
return 0;
}
static struct snd_device_ops snd_stm_pcm_reader_snd_device_ops = {
.dev_register = snd_stm_pcm_reader_register,
.dev_disconnect = snd_stm_pcm_reader_disconnect,
};
/*
* Platform driver routines
*/
static int snd_stm_pcm_reader_probe(struct platform_device *pdev)
{
int result = 0;
struct snd_stm_pcm_reader *pcm_reader;
struct snd_card *card = snd_stm_card_get();
int i;
snd_stm_printd(0, "%s('%s')\n", __func__, dev_name(&pdev->dev));
BUG_ON(!card);
pcm_reader = kzalloc(sizeof(*pcm_reader), GFP_KERNEL);
if (!pcm_reader) {
snd_stm_printe("Can't allocate memory "
"for a device description!\n");
result = -ENOMEM;
goto error_alloc;
}
snd_stm_magic_set(pcm_reader);
pcm_reader->info = pdev->dev.platform_data;
BUG_ON(!pcm_reader->info);
pcm_reader->ver = pcm_reader->info->ver;
BUG_ON(pcm_reader->ver <= 0);
pcm_reader->device = &pdev->dev;
/* Get resources */
result = snd_stm_memory_request(pdev, &pcm_reader->mem_region,
&pcm_reader->base);
if (result < 0) {
snd_stm_printe("Memory region request failed!\n");
goto error_memory_request;
}
pcm_reader->fifo_phys_address = pcm_reader->mem_region->start +
offset__AUD_PCMIN_DATA(pcm_reader);
snd_stm_printd(0, "FIFO physical address: 0x%lx.\n",
pcm_reader->fifo_phys_address);
result = snd_stm_irq_request(pdev, &pcm_reader->irq,
snd_stm_pcm_reader_irq_handler, pcm_reader);
if (result < 0) {
snd_stm_printe("IRQ request failed!\n");
goto error_irq_request;
}
result = snd_stm_fdma_request(pdev, &pcm_reader->fdma_channel);
if (result < 0) {
snd_stm_printe("FDMA request failed!\n");
goto error_fdma_request;
}
/* FDMA transfer size depends (among others ;-) on FIFO length,
* which is:
* - 2 cells (8 bytes) in STx7100/9 and STx7200 cut 1.0
* - 70 cells (280 bytes) in STx7111 and STx7200 cut 2.0. */
if (pcm_reader->ver < 4)
pcm_reader->fdma_max_transfer_size = 2;
else
pcm_reader->fdma_max_transfer_size = 30;
/* Get component capabilities */
snd_stm_printd(0, "Reader's name is '%s'\n", pcm_reader->info->name);
if (pcm_reader->ver < 5) {
/* STx7111 has a hardware bug in PCM reader in multichannels
* mode, so we will just not be using it ;-) */
static unsigned int channels_2[] = { 2 };
BUG_ON(pcm_reader->info->channels != 2);
pcm_reader->channels_constraint.list = channels_2;
pcm_reader->channels_constraint.count = 1;
} else {
static unsigned int channels_2_10[] = { 2, 4, 6, 8, 10 };
BUG_ON(pcm_reader->info->channels <= 0);
BUG_ON(pcm_reader->info->channels > 10);
BUG_ON(pcm_reader->info->channels % 2 != 0);
pcm_reader->channels_constraint.list = channels_2_10;
pcm_reader->channels_constraint.count =
pcm_reader->info->channels / 2;
}
pcm_reader->channels_constraint.mask = 0;
for (i = 0; i < pcm_reader->channels_constraint.count; i++)
snd_stm_printd(0, "Reader capable of capturing %u-channels PCM."
"\n", pcm_reader->channels_constraint.list[i]);
/* Create ALSA lowlevel device */
result = snd_device_new(card, SNDRV_DEV_LOWLEVEL, pcm_reader,
&snd_stm_pcm_reader_snd_device_ops);
if (result < 0) {
snd_stm_printe("ALSA low level device creation failed!\n");
goto error_device;
}
/* Create ALSA PCM device */
result = snd_pcm_new(card, NULL, pcm_reader->info->card_device, 0, 1,
&pcm_reader->pcm);
if (result < 0) {
snd_stm_printe("ALSA PCM instance creation failed!\n");
goto error_pcm;
}
pcm_reader->pcm->private_data = pcm_reader;
strcpy(pcm_reader->pcm->name, pcm_reader->info->name);
snd_pcm_set_ops(pcm_reader->pcm, SNDRV_PCM_STREAM_CAPTURE,
&snd_stm_pcm_reader_pcm_ops);
/* Initialize buffer */
pcm_reader->buffer = snd_stm_buffer_create(pcm_reader->pcm,
pcm_reader->device,
snd_stm_pcm_reader_hw.buffer_bytes_max);
if (!pcm_reader->buffer) {
snd_stm_printe("Cannot initialize buffer!\n");
result = -ENOMEM;
goto error_buffer_create;
}
/* Register in converters router */
pcm_reader->conv_source = snd_stm_conv_register_source(
&platform_bus_type, dev_name(&pdev->dev),
pcm_reader->info->channels,
card, pcm_reader->info->card_device);
if (!pcm_reader->conv_source) {
snd_stm_printe("Cannot register in converters router!\n");
result = -ENOMEM;
goto error_conv_register_source;
}
/* Claim the pads */
if (pcm_reader->info->pad_config) {
pcm_reader->pads = stm_pad_claim(pcm_reader->info->pad_config,
dev_name(&pdev->dev));
if (!pcm_reader->pads) {
snd_stm_printe("Failed to claimed pads for '%s'!\n",
dev_name(&pdev->dev));
result = -EBUSY;
goto error_pad_claim;
}
}
/* Done now */
platform_set_drvdata(pdev, pcm_reader);
return 0;
error_pad_claim:
snd_stm_conv_unregister_source(pcm_reader->conv_source);
error_conv_register_source:
snd_stm_buffer_dispose(pcm_reader->buffer);
error_buffer_create:
/* snd_pcm_free() is not available - PCM device will be released
* during card release */
error_pcm:
snd_device_free(card, pcm_reader);
error_device:
snd_stm_fdma_release(pcm_reader->fdma_channel);
error_fdma_request:
snd_stm_irq_release(pcm_reader->irq, pcm_reader);
error_irq_request:
snd_stm_memory_release(pcm_reader->mem_region, pcm_reader->base);
error_memory_request:
snd_stm_magic_clear(pcm_reader);
kfree(pcm_reader);
error_alloc:
return result;
}
static int snd_stm_pcm_reader_remove(struct platform_device *pdev)
{
struct snd_stm_pcm_reader *pcm_reader = platform_get_drvdata(pdev);
snd_stm_printd(1, "snd_stm_pcm_reader_remove(pdev=%p)\n", pdev);
BUG_ON(!pcm_reader);
BUG_ON(!snd_stm_magic_valid(pcm_reader));
if (pcm_reader->pads)
stm_pad_release(pcm_reader->pads);
snd_stm_conv_unregister_source(pcm_reader->conv_source);
snd_stm_buffer_dispose(pcm_reader->buffer);
snd_stm_fdma_release(pcm_reader->fdma_channel);
snd_stm_irq_release(pcm_reader->irq, pcm_reader);
snd_stm_memory_release(pcm_reader->mem_region, pcm_reader->base);
snd_stm_magic_clear(pcm_reader);
kfree(pcm_reader);
return 0;
}
static struct platform_driver snd_stm_pcm_reader_driver = {
.driver.name = "snd_pcm_reader",
.probe = snd_stm_pcm_reader_probe,
.remove = snd_stm_pcm_reader_remove,
};
/*
* Initialization
*/
static int __init snd_stm_pcm_reader_init(void)
{
return platform_driver_register(&snd_stm_pcm_reader_driver);
}
static void __exit snd_stm_pcm_reader_exit(void)
{
platform_driver_unregister(&snd_stm_pcm_reader_driver);
}
MODULE_AUTHOR("Pawel Moll <pawel.moll@st.com>");
MODULE_DESCRIPTION("STMicroelectronics PCM reader driver");
MODULE_LICENSE("GPL");
module_init(snd_stm_pcm_reader_init);
module_exit(snd_stm_pcm_reader_exit);
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