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|
/*
* Driver for Philips UDA1341TS on Compaq iPAQ H3600 soundcard
* Copyright (C) 2002 Tomas Kasparek <tomas.kasparek@seznam.cz>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License.
*
* History:
*
* 2002-03-13 Tomas Kasparek initial release - based on h3600-uda1341.c from OSS
* 2002-03-20 Tomas Kasparek playback over ALSA is working
* 2002-03-28 Tomas Kasparek playback over OSS emulation is working
* 2002-03-29 Tomas Kasparek basic capture is working (native ALSA)
* 2002-03-29 Tomas Kasparek capture is working (OSS emulation)
* 2002-04-04 Tomas Kasparek better rates handling (allow non-standard rates)
* 2003-02-14 Brian Avery fixed full duplex mode, other updates
* 2003-02-20 Tomas Kasparek merged updates by Brian (except HAL)
* 2003-04-19 Jaroslav Kysela recoded DMA stuff to follow 2.4.18rmk3-hh24 kernel
* working suspend and resume
* 2003-04-28 Tomas Kasparek updated work by Jaroslav to compile it under 2.5.x again
* merged HAL layer (patches from Brian)
*/
/* $Id: sa11xx-uda1341.c,v 1.27 2005/12/07 09:13:42 cladisch Exp $ */
/***************************************************************************************************
*
* To understand what Alsa Drivers should be doing look at "Writing an Alsa Driver" by Takashi Iwai
* available in the Alsa doc section on the website
*
* A few notes to make things clearer. The UDA1341 is hooked up to Serial port 4 on the SA1100.
* We are using SSP mode to talk to the UDA1341. The UDA1341 bit & wordselect clocks are generated
* by this UART. Unfortunately, the clock only runs if the transmit buffer has something in it.
* So, if we are just recording, we feed the transmit DMA stream a bunch of 0x0000 so that the
* transmit buffer is full and the clock keeps going. The zeroes come from FLUSH_BASE_PHYS which
* is a mem loc that always decodes to 0's w/ no off chip access.
*
* Some alsa terminology:
* frame => num_channels * sample_size e.g stereo 16 bit is 2 * 16 = 32 bytes
* period => the least number of bytes that will generate an interrupt e.g. we have a 1024 byte
* buffer and 4 periods in the runtime structure this means we'll get an int every 256
* bytes or 4 times per buffer.
* A number of the sizes are in frames rather than bytes, use frames_to_bytes and
* bytes_to_frames to convert. The easiest way to tell the units is to look at the
* type i.e. runtime-> buffer_size is in frames and its type is snd_pcm_uframes_t
*
* Notes about the pointer fxn:
* The pointer fxn needs to return the offset into the dma buffer in frames.
* Interrupts must be blocked before calling the dma_get_pos fxn to avoid race with interrupts.
*
* Notes about pause/resume
* Implementing this would be complicated so it's skipped. The problem case is:
* A full duplex connection is going, then play is paused. At this point you need to start xmitting
* 0's to keep the record active which means you cant just freeze the dma and resume it later you'd
* need to save off the dma info, and restore it properly on a resume. Yeach!
*
* Notes about transfer methods:
* The async write calls fail. I probably need to implement something else to support them?
*
***************************************************************************************************/
#include <linux/config.h>
#include <sound/driver.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/errno.h>
#include <linux/ioctl.h>
#include <linux/delay.h>
#include <linux/slab.h>
#ifdef CONFIG_PM
#include <linux/pm.h>
#endif
#include <asm/hardware.h>
#include <asm/arch/h3600.h>
#include <asm/mach-types.h>
#include <asm/dma.h>
#ifdef CONFIG_H3600_HAL
#include <asm/semaphore.h>
#include <asm/uaccess.h>
#include <asm/arch/h3600_hal.h>
#endif
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/initval.h>
#include <linux/l3/l3.h>
#undef DEBUG_MODE
#undef DEBUG_FUNCTION_NAMES
#include <sound/uda1341.h>
/*
* FIXME: Is this enough as autodetection of 2.4.X-rmkY-hhZ kernels?
* We use DMA stuff from 2.4.18-rmk3-hh24 here to be able to compile this
* module for Familiar 0.6.1
*/
#ifdef CONFIG_H3600_HAL
#define HH_VERSION 1
#endif
/* {{{ Type definitions */
MODULE_AUTHOR("Tomas Kasparek <tomas.kasparek@seznam.cz>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("SA1100/SA1111 + UDA1341TS driver for ALSA");
MODULE_SUPPORTED_DEVICE("{{UDA1341,iPAQ H3600 UDA1341TS}}");
static char *id = NULL; /* ID for this card */
module_param(id, charp, 0444);
MODULE_PARM_DESC(id, "ID string for SA1100/SA1111 + UDA1341TS soundcard.");
struct audio_stream {
char *id; /* identification string */
int stream_id; /* numeric identification */
dma_device_t dma_dev; /* device identifier for DMA */
#ifdef HH_VERSION
dmach_t dmach; /* dma channel identification */
#else
dma_regs_t *dma_regs; /* points to our DMA registers */
#endif
int active:1; /* we are using this stream for transfer now */
int period; /* current transfer period */
int periods; /* current count of periods registerd in the DMA engine */
int tx_spin; /* are we recoding - flag used to do DMA trans. for sync */
unsigned int old_offset;
spinlock_t dma_lock; /* for locking in DMA operations (see dma-sa1100.c in the kernel) */
struct snd_pcm_substream *stream;
};
struct sa11xx_uda1341 {
struct snd_card *card;
struct l3_client *uda1341;
struct snd_pcm *pcm;
long samplerate;
struct audio_stream s[2]; /* playback & capture */
};
static unsigned int rates[] = {
8000, 10666, 10985, 14647,
16000, 21970, 22050, 24000,
29400, 32000, 44100, 48000,
};
static struct snd_pcm_hw_constraint_list hw_constraints_rates = {
.count = ARRAY_SIZE(rates),
.list = rates,
.mask = 0,
};
static struct platform_device *device;
/* }}} */
/* {{{ Clock and sample rate stuff */
/*
* Stop-gap solution until rest of hh.org HAL stuff is merged.
*/
#define GPIO_H3600_CLK_SET0 GPIO_GPIO (12)
#define GPIO_H3600_CLK_SET1 GPIO_GPIO (13)
#ifdef CONFIG_SA1100_H3XXX
#define clr_sa11xx_uda1341_egpio(x) clr_h3600_egpio(x)
#define set_sa11xx_uda1341_egpio(x) set_h3600_egpio(x)
#else
#error This driver could serve H3x00 handhelds only!
#endif
static void sa11xx_uda1341_set_audio_clock(long val)
{
switch (val) {
case 24000: case 32000: case 48000: /* 00: 12.288 MHz */
GPCR = GPIO_H3600_CLK_SET0 | GPIO_H3600_CLK_SET1;
break;
case 22050: case 29400: case 44100: /* 01: 11.2896 MHz */
GPSR = GPIO_H3600_CLK_SET0;
GPCR = GPIO_H3600_CLK_SET1;
break;
case 8000: case 10666: case 16000: /* 10: 4.096 MHz */
GPCR = GPIO_H3600_CLK_SET0;
GPSR = GPIO_H3600_CLK_SET1;
break;
case 10985: case 14647: case 21970: /* 11: 5.6245 MHz */
GPSR = GPIO_H3600_CLK_SET0 | GPIO_H3600_CLK_SET1;
break;
}
}
static void sa11xx_uda1341_set_samplerate(struct sa11xx_uda1341 *sa11xx_uda1341, long rate)
{
int clk_div = 0;
int clk=0;
/* We don't want to mess with clocks when frames are in flight */
Ser4SSCR0 &
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