i2s_ak4642en.c

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/*
 * i2s.c
 *
 * JzSOC On-Chip I2S audio driver.
 *
 * Author: Seeger Chin
 * e-mail: [e-mail]
 *
 * Copyright (C) 2006 Ingenic Semiconductor Corp.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */

#include <includes.h>
#include <regs.h>
#include <ops.h>
#include <clock.h>
#include "pcm.h"

#define CONFIG_I2S_AK4642EN

#ifndef u8
#define u8 unsigned char
#endif
#ifndef u16
#define u16 unsigned short
#endif
#ifndef u32
#define u32 unsigned int
#endif

#define AUDIO_READ_DMA	0
#define AUDIO_WRITE_DMA	1

#ifdef PHYADDR
#undef PHYADDR
#endif
#define PHYADDR(n)	((n) & 0x1fffffff)
#ifdef KSEG1ADDR
#undef KSEG1ADDR
#endif
#define	KSEG1ADDR(n)	(PHYADDR(n) | 0xa0000000)

#ifdef PAGE_SIZE
#undef PAGE_SIZE
#endif
#define PAGE_SIZE	0x1000

extern void printf(const char *fmt, ...);

#define STANDARD_SPEED  48000
#define SYNC_CLK	48000

#define MAX_RETRY       100

static unsigned long i2s_clk;
static int		jz_audio_b; 
static int		jz_audio_rate;
static char		jz_audio_format;
static char		jz_audio_channels;

static void jz_update_filler(int bits, int channels);

static void jz_i2s_replay_dma_irq(unsigned int);
static void jz_i2s_record_dma_irq(unsigned int);

static void (*replay_filler)(unsigned long src_start, int count, int id);
static int (*record_filler)(unsigned long dst_start, int count, int id);

#define QUEUE_MAX 2

typedef struct buffer_queue_s {
	int count;
	int id[QUEUE_MAX];
	int lock;
} buffer_queue_t;

static unsigned long out_dma_buf[QUEUE_MAX+1];
static unsigned long out_dma_pbuf[QUEUE_MAX+1];
static unsigned long out_dma_buf_data_count[QUEUE_MAX+1];
static unsigned long in_dma_buf[QUEUE_MAX+1];
static unsigned long in_dma_pbuf[QUEUE_MAX+1];
static unsigned long in_dma_buf_data_count[QUEUE_MAX+1];

static buffer_queue_t out_empty_queue;
static buffer_queue_t out_full_queue;
static buffer_queue_t out_busy_queue;

static buffer_queue_t in_empty_queue;
static buffer_queue_t in_full_queue;
static buffer_queue_t in_busy_queue;

static int first_record_call = 0;

static OS_EVENT *tx_sem;
static OS_EVENT *rx_sem;

extern int IS_WRITE_PCM;

static inline int get_buffer_id(struct buffer_queue_s *q)
{
	int r;
	unsigned long flags;
	int i;
	flags = spin_lock_irqsave();
	if (q->count == 0) return -1;
	r = q->id[0];
	for (i=0;i < q->count-1;i++)
		q->id[i] = q->id[i+1];
	q->count --;
	spin_unlock_irqrestore(flags);
	return r;
}

static inline void put_buffer_id(struct buffer_queue_s *q, int id)
{
	unsigned long flags;
	flags = spin_lock_irqsave();
	q->id[q->count] = id;
	q->count ++;
	spin_unlock_irqrestore(flags);
}

static  inline int elements_in_queue(struct buffer_queue_s *q)
{
	int r;
	unsigned long flags;

	flags=spin_lock_irqsave();
	r = q->count;
	spin_unlock_irqrestore(flags);

	return r;
}

/****************************************************************************
 * Architecture related routines
 ****************************************************************************/
static void jz_i2s_record_dma_irq (unsigned int arg)
{
	int dma = AUDIO_READ_DMA;
	int id1, id2;

	dma_stop(dma);
	if (__dmac_channel_address_error_detected(dma)) {
		printf("%s: DMAC address error.\n", __FUNCTION__);
		__dmac_channel_clear_address_error(dma);
	}
	if (__dmac_channel_transmit_end_detected(dma)) {
		__dmac_channel_clear_transmit_end(dma);

		id1 = get_buffer_id(&in_busy_queue);
		put_buffer_id(&in_full_queue, id1);
		//__dcache_invalidate_all();

		OSSemPost(rx_sem);

		if ((id2 = get_buffer_id(&in_empty_queue)) >= 0) {
			put_buffer_id(&in_busy_queue, id2);

			in_dma_buf_data_count[id2] = in_dma_buf_data_count[id1];

			dma_start(dma, PHYADDR(AIC_DR), in_dma_pbuf[id2],
				  in_dma_buf_data_count[id2]);
		} else
			in_busy_queue.count = 0;
	}
}

static void jz_i2s_replay_dma_irq (unsigned int arg)
{
	int dma = AUDIO_WRITE_DMA;
	int id;
	dma_stop(dma);
	if (__dmac_channel_address_error_detected(dma)) {
		printf("%s: DMAC address error.\n", __FUNCTION__);
		__dmac_channel_clear_address_error(dma);
	}

	if (__dmac_channel_transmit_end_detected(dma)) {
		__dmac_channel_clear_transmit_end(dma);
		if ((id = get_buffer_id(&out_busy_queue)) < 0)
			printf("Strange DMA finish interrupt for AIC module\n");

		put_buffer_id(&out_empty_queue, id);
		if ((id = get_buffer_id(&out_full_queue)) >= 0) {
			put_buffer_id(&out_busy_queue, id);
			dma_start(dma, out_dma_pbuf[id], PHYADDR(AIC_DR),
				  out_dma_buf_data_count[id]);

		} else
			out_busy_queue.count = 0;

		if (elements_in_queue(&out_empty_queue) > 0)
			OSSemPost(tx_sem);
	}
}

/*
 * Initialize the onchip I2S controller
 */

static void jz_i2s_initHw(void)
{
	i2s_clk = __cpm_get_i2sclk();
	__i2s_disable();
	__i2s_as_slave();
	__i2s_set_sample_size(16);
	__i2s_enable();
	//REG_AIC_I2SCR |= 0x06;

	__i2s_disable_record();
	__i2s_disable_replay();
	__i2s_disable_loopback();

	__i2s_set_transmit_trigger(7);
	__i2s_set_receive_trigger(7);
}

static int jz_audio_set_speed(int rate)
{
/* 8000, 11025, 16000, 22050, 24000, 32000, 44100, 48000, 99999999 ? */
	if (rate > 48000)
		rate = 48000;
	if (rate < 8000)
		rate = 8000;
	jz_audio_rate = rate;

	i2s_codec_set_samplerate(rate);
	return rate;
}
static int record_fill_1x8_u(unsigned long dst_start, int count, int id)
{
	int cnt = 0;
	unsigned long data;
	volatile unsigned long *s = (unsigned long*)(in_dma_buf[id]);
	volatile unsigned char *dp = (unsigned char*)dst_start;

	while (count > 0) {
		count -= 2;		/* count in dword */
		cnt++;
		data = *(s++);
		*(dp ++) = ((data << 16) >> 24) + 0x80;
		s++;		/* skip the other channel */
	}
	return cnt;
}


static int record_fill_2x8_u(unsigned long dst_start, int count, int id)
{
	int cnt = 0;
	unsigned long d1, d2;
	volatile unsigned long *s = (unsigned long*)(in_dma_buf[id]);
	volatile unsigned char *dp = (unsigned char*)dst_start;

	while (count > 0) {
		count -= 2;
		cnt += 2;
		d1 = *(s++);
		*(dp ++) = ((d1 << 16) >> 24) + 0x80;
		d2 = *(s++);
		*(dp ++) = ((d2 << 16) >> 24) + 0x80;
	}
	return cnt;
}

static int record_fill_1x16_s(unsigned long dst_start, int count, int id)
{
	int cnt = 0;
	unsigned long d1;
	unsigned long *s = (unsigned long*)(in_dma_buf[id]);
	unsigned short *dp = (unsigned short *)dst_start;
	
	while (count > 0) {
		count -= 2;		/* count in dword */
		cnt += 2;	/* count in byte */
		d1 = *(s++);
		*(dp ++) = (d1 << 16) >> 16;
		s++;		/* skip the other channel */
	}
	return cnt;
}

static int record_fill_2x16_s(unsigned long dst_start, int count, int id)
{
		int cnt = 0;
	unsigned long d1, d2;
	unsigned long *s = (unsigned long*)(in_dma_buf[id]);
	unsigned short *dp = (unsigned short *)dst_start;
	while (count > 0) {
		count -= 2;		/* count in dword */
			cnt += 4;	/* count in byte */
			d1 = *(s++);
			*(dp++) = (d1 & 0xffff);
			d2 = *(s++);
			*(dp++) = (d2 & 0xffff);
	}

	return cnt;

}


static void replay_fill_1x8_u(unsigned long src_start, int count, int id)
{
	int cnt = 0;
	unsigned char data;
	unsigned long ddata;
	volatile unsigned char *s = (unsigned char *)src_start;
	volatile unsigned long *dp = (unsigned long*)(out_dma_buf[id]);
	while (count > 0) {
		count--;
		cnt += 1;
		data = *(s++) - 0x80;//see ak4642en page 29
		ddata = (unsigned long) data << 8;
		*(dp ++) = ddata;
		*(dp ++) = ddata;
	}
	cnt = cnt * 2 * jz_audio_b;
	
	out_dma_buf_data_count[id] = cnt;
}

static void replay_fill_2x8_u(unsigned long src_start, int count, int id)
{
	int cnt = 0;
	unsigned char d1;
	unsigned long dd1;
	volatile unsigned char *s = (unsigned char *)src_start;
	volatile unsigned long *dp = (unsigned long*)(out_dma_buf[id]);
	while (count > 0) {
		count -= 1;
		cnt += 1 ;
		d1 = *(s++) - 0x80;
		dd1 = (unsigned long) d1 << 8;
		*(dp ++) = dd1;
	}
	cnt *= jz_audio_b;
	out_dma_buf_data_count[id] = cnt;
}

static void replay_fill_1x16_s(unsigned long src_start, int count, int id)
{
	int cnt = 0;
	unsigned short d1;
	unsigned long l1;
	volatile unsigned short *s = (unsigned short *)src_start;
	volatile unsigned long *dp = (unsigned long*)(out_dma_buf[id]);
	while (count > 0) {
		count -= 2;
		cnt += 2 ;
		d1 = *(s++);
		l1 = (unsigned long)d1;
		*(dp ++) = l1;
		*(dp ++) = l1;
	}
	cnt = cnt  * 2 *  jz_audio_b;
	out_dma_buf_data_count[id] = cnt;