I2S driver

I2S driver

[Angelo]

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Hi my name is Angelo. 

I'm working on I2S driver, on MPC5200b board. 
Does anyone tell me where i can found some information on HOW to write it?

Thanks for help.



       
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Re: I2S driver

[Roman Fietze]

Hello Ngelo,

On Monday 03 March 2008 13:08:43 Angelo wrote:

> I'm working on I2S driver, on MPC5200b board.

An ALSA sound driver?

If yes, there are many places where you can find documentation. If
not, there are still many places where you can find documentation.

Could you please specify more precisely what you want to do or where
you are having problems.


Roman

=2D-=20
Roman Fietze Telemotive AG B=FCro M=FChlhausen

Re: I2S driver

[Mark Brown]

On Mon, Mar 03, 2008 at 01:40:36PM +0100, Roman Fietze wrote:
> On Monday 03 March 2008 13:08:43 Angelo wrote:

> > I'm working on I2S driver, on MPC5200b board.

> An ALSA sound driver?

> If yes, there are many places where you can find documentation. If
> not, there are still many places where you can find documentation.

> Could you please specify more precisely what you want to do or where
> you are having problems.

If you are working on an audio device in an embedded system you probably
want to use the ALSA SoC subsystem - have a look at
Documentation/sound/alsa/soc and sound/soc for information.  There is a
development git tree for this availiable at:

	git://opensource.wolfsonmicro.com/linux-2.6-asoc

RE: I2S driver

[Pedro Luis D. L.]

Angelo wrote:
=20
> Hi my name is Angelo.
>=20
> I'm working on I2S driver, on MPC5200b board.
> Does anyone tell me where i can found some information on HOW to write it=
?
>=20
> Thanks for help.
>=20


Hello Angelo,
depends on which kernel version are you using. You can find some working co=
de in DENX repository:
http://source.denx.net/cgi-bin/gitweb.cgi
=20
I can also send you some GPL'd code that works. It is extremely bad comment=
ed (:-p) and probably not useful (it's not an ALSA driver itself, but it us=
es the DMA to copy data to the PSC - I2S mode) but it works. But this code =
is based on 2.6.16 kernel.

Tell me the version and I would guide you a little bit.
=20
Regards,
Pedro.

_________________________________________________________________
MSN Video.=20
http://video.msn.com/?mkt=3Des-es=

Re: I2S driver

[Wolfgang Denk]

In message <BLU106-W22AC7D9FCF4035AF6AB5E6CA170@phx.gbl> you wrote:
> 
> depends on which kernel version are you using. You can find some working code in DENX repository:
> http://source.denx.net/cgi-bin/gitweb.cgi

Ah, you should use the official server instead:

http://www.denx.de/cgi-bin/gitweb.cgi


Best regards,

Wolfgang Denk

-- 
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de
    \|/ ____ \|/                                     \|/ ____ \|/
     @~/ ,. \~@                                       @~/ ,. \~@
    /_( \__/ )_\                                     /_( \__/ )_\
       \__U_/                                           \__U_/

Re: I2S driver

[Timur Tabi]

Angelo wrote:
> Hi my name is Angelo.
> 
> I'm working on I2S driver, on MPC5200b board.
> Does anyone tell me where i can found some information on HOW to write it?

I wrote an ASoC driver for the MPC8610, which also has an I2S interface.  You
can find it in sound/soc/fsl.

-- 
Timur Tabi
Linux kernel developer at Freescale

i2s driver

[Angelo]

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Thanks for answer.

>I can also send you some GPL'd code that works.
>It is extremely bad commented (:-p) and probably not useful
> (it's not an ALSA driver itself, but it uses the DMA to
> copy data to the PSC - I2S mode) but it works. 

It is a great idea; i can use it to start. 
You can send it via mail..

> But this code is based on 2.6.16 kernel.

I'm using 2.6.22 kernel version.

I just enabled in lite5200b.dts:

//PSC3 in CODEC mode example  //asimmini
i2s@2400 {  // PSC3
 device_type = "sound";
 compatible = "mpc5200b-psc-i2s";//not 5200 compatible
 cell-index = <2>;
 reg = <2400 100>;
 interrupts = <2 3 0>;
 interrupt-parent = <&mpc5200_pic>;
};

..and added in lite5200.c, in function mpc52xx_psc_functions
...
struct mpc52xx_psc_func mpc52xx_psc_functions[]= {
{       .id     = 2,  
        .func   = "i2s",
},
...
thanks for help.




       
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I2S driver

[Angelo]

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Timur wrote:
>I wrote an ASoC driver for the MPC8610, which also has 
>an I2S interface.  You can find it in sound/soc/fsl.

in my kernel version (2.6.22) there isn't any folder named
fsl in sound/soc/

So where i can found it?

thanks for help.




       
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Re: I2S driver

[Phillip Lougher]

On Mon, Mar 3, 2008 at 5:05 PM, Angelo <s104259@yahoo.it> wrote:

> in my kernel version (2.6.22) there isn't any folder named
> fsl in sound/soc/
>
> So where i can found it?
>

Get the development git tree,  available at:

       git://opensource.wolfsonmicro.com/linux-2.6-asoc

http://opensource.wolfsonmicro.com/node/6 gives more info on the
development trees.


Phillip

> thanks for help.
>
>
>
>
>
>  ________________________________
> ________________________________
>
> L'email della prossima generazione? Puoi averla con la nuova Yahoo! Mail
> _______________________________________________
>  Linuxppc-embedded mailing list
>  Linuxppc-embedded@ozlabs.org
>  https://ozlabs.org/mailman/listinfo/linuxppc-embedded
>

Re: I2S driver

[Timur Tabi]

Angelo wrote:
> Timur wrote:
>>I wrote an ASoC driver for the MPC8610, which also has 
>>an I2S interface.  You can find it in sound/soc/fsl.
> 
> in my kernel version (2.6.22) there isn't any folder named
> fsl in sound/soc/

It's in 2.6.25.

-- 
Timur Tabi
Linux kernel developer at Freescale

I2S driver

[Angelo]

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Angelo wrote:
> Timur wrote:
>>I wrote an ASoC driver for the MPC8610, which also has 
>>an I2S interface.  You can find it in sound/soc/fsl.
> 
> in my kernel version (2.6.22) there isn't any folder named
> fsl in sound/soc/

> Timur wrote:
> It's in 2.6.25.


The main problem is that in the feature of MPC8610 you can find:
  Two synchronous serial interface (SSI) controllers for I2S or AC97   
  audio     inputs/outputs

while in MPC5200b's feature there's only:
  I2S (up to three)
However the main difference features:
MPC5200B: http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=MPC5200B&nodeId=0162468rH3bTdG0898
MPC8610:
http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=MPC8610

What do you think on this difference?




       
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RE: I2S driver

[Pedro Luis D. L.]

Ok, here down is the code I told you.
A few considerations before:
 - As I told you, it is very bad commented, sorry. I'm still working on it.
 - It's is not an alsa driver, but it copies data to the PSC working as SPI=
 mode (it is not I2S but you only need to change the PSC configuration).
 - Its purpose is to establish a dma task to copy the data from a buffer to=
 the PSC, where I had attached a Digital to Analog Converter that into soun=
d through a speaker.
 - Data alignment is imposed by DAC requirements.
 - Clock configuration is fixed to 44.1 Khz, so audio data must be sampled =
using that frequency. Data must be also mono (only one converter attached).
 - This module is part of a mayor project to stream audio data through ethe=
rnet, so it provides a function to copy audio data to audio buffers. If the=
re's no data to copy, it copies a null buffer to keep silence.
 - What can you find useful in this code? Configuration steps to establish =
DMA Tasks and PSC configuration.
 - After the module I send you also the code from another module that estab=
lishes PSC as I2S configuration. Clocks where adjusted to send the audio da=
ta also at 44.1 Khz as fine tunned as possible due to communication require=
ments of the attached DAC in that hardware.

And finally, here is the code:

/**************************************************************************=
*
 *   Copyright (C) 2007 by Pedro L. Dom=EDnguez                            =
  *
 *   pedro.dominguez@aed-engineering.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.             =
*
 *                                                                         =
*
 *   History                                                               =
*
 *     Original Version by Bernhard Kuhn              *
 *            for 2.6.16 kernel                                            =
*
 **************************************************************************=
*/

#define SPI_DBG

#ifdef SPI_DBG
#define DBG(x...) printk("(debug) " x)
#else
#define DBG(x...)
#endif

#include=20
#include=20
#include=20
#include=20
#include=20
#include=20
#include=20
#include=20
#include=20
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#include=20
#include=20
#include=20
#include=20
#include=20
#include=20
#include=20
#include=20
#include=20
#include=20
#include=20
#include=20
#include=20
#include=20
#include=20
#include=20
#include=20
#include=20
#include=20
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#include=20
#include=20
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#include=20
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#include=20
#include=20
// #include=20

#define BPF             2      // bytes per frame
#define SLOTS           2
#define SAMPLESIZE      (BPF*SLOTS)
#define FPP             1024   // bytes per copy period=20
#define PERIODS         8      // periods
#define PERIODSIZE      (SAMPLESIZE/2*FPP)
#define BUFSIZE         (SAMPLESIZE*FPP*PERIODS)
#define FPP_HW          128
//512    // 10 ms
#define PERIODS_HW      8      // periods
#define PERIODSIZE_HW   (SAMPLESIZE*FPP_HW)

#define FIFOSIZE	512
#define RX_GRAN		4
#define TX_GRAN		4
#define	RX_ALARM	0x120
#define	TX_ALARM	FIFOSIZE - (TX_GRAN * 4) - 208

#define DELAY_TIME_SLOT 0x20000000
#define GEN_CLK_INT 0x00800000
#define MULTIWD_ENABLE 0x00400000
#define CLK_POL_RISING 0x00200000

#define PROCFS_NAME	"MPC52xx_SPI"
#define MCLKEN_DIV 0x8001
#define DRV_NAME "mpc52xx-psc-spi"
#define PROCFS_MAX_SIZE		1024
#define BUF_FRAMES 300

/* MBAR position */
#define MPC52xx_MBAR		0xf0000000	/* Phys address */
#define MPC52xx_MBAR_VIRT	0xf0000000	/* Virt address */
#define MPC52xx_MBAR_SIZE	0x00010000

#define MPC52xx_PA(x)		((phys_addr_t)(MPC52xx_MBAR + (x)))
#define MPC52xx_VA(x)		((void __iomem *)(MPC52xx_MBAR_VIRT + (x)))

/* Registers zone offset/size  */
#define MPC52xx_MMAP_CTL_OFFSET		0x0000
#define MPC52xx_MMAP_CTL_SIZE		0x068
#define MPC52xx_SDRAM_OFFSET		0x0100
#define MPC52xx_SDRAM_SIZE		0x010
#define MPC52xx_CDM_OFFSET		0x0200
#define MPC52xx_CDM_SIZE		0x038
#define MPC52xx_INTR_OFFSET		0x0500
#define MPC52xx_INTR_SIZE		0x04c
#define MPC52xx_GPTx_OFFSET(x)		(0x0600 + ((x)<<buffer.va =3D kmalloc(PERIO=
DSIZE_HW, GFP_DMA);
	FirstNodeFree->buffer.pa =3D virt_to_phys((void *)FirstNodeFree->buffer.va=
);
	node =3D FirstNodeFree;

	for (i=3D1;inext =3D (Node *)kmalloc(sizeof(Node), GFP_KERNEL);=09
		node->next->buffer.va =3D kmalloc(PERIODSIZE_HW, GFP_DMA);
		node->next->buffer.pa =3D virt_to_phys((void *)node->next->buffer.va);
		node =3D node->next;
	}
	LastNodeFree =3D node;
	LastNodeFree->next=3DNULL;
	DBG("SPI_buffers_init()\n");
	// prepare reception buffer=09
	SPI_rx_bufs.va =3D kmalloc(BUFSIZE, GFP_DMA);

	SPI_rx_bufs.pa =3D virt_to_phys((void *)SPI_rx_bufs.va);

	// prepare silence buffer
	SPI_tx_silence.va =3D kmalloc(BUFSIZE, GFP_DMA);

	SPI_tx_silence.pa =3D virt_to_phys((void *)SPI_tx_silence.va);

	memset(SPI_tx_silence.va,0,BUFSIZE);

	return 0;
}

int snd_SPI_pcm_trigger(struct snd_pcm_substream *substream, int cmd) {
#ifdef SND_I2S_DEBUG
	printk("snd_SPI_pcm_trigger\n");
#endif
	switch (cmd) {
		case SNDRV_PCM_TRIGGER_START:
		case SNDRV_PCM_TRIGGER_RESUME:
#ifdef SND_I2S_DEBUG
			printk("START\n");
#endif
			snd_SPI_substream=3Dsubstream;
			snd_SPImgt_started=3D2;
			snd_SPImgt_running=3D1;

			break;
		case SNDRV_PCM_TRIGGER_STOP:
		case SNDRV_PCM_TRIGGER_SUSPEND:
#ifdef SND_I2S_DEBUG
			printk("STOP\n");
#endif
			snd_SPImgt_running=3D0;
			break;

		case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
			printk("  PAUSE_PUSH\n");
			break;
		case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
			printk("  PAUSE_RELEASE\n");
			break;
		default:
			return -EINVAL;
	}
	return 0;
};

EXPORT_SYMBOL(snd_SPI_pcm_trigger);


static irqreturn_t SPI_rx_irq(int irq, void *dev_id) {
	// no need for TaskIntClear(rxtask), OS masks and acks IRQ

	struct mpc52xx_spi_priv *priv =3D dev_id;

	spin_lock(&priv->dma_lock);
	while (bcom_buffer_done(rx_bcom)) {
		struct bcom_gen_bd *bd;
		bcom_retrieve_buffer(rx_bcom, NULL, NULL);
		/* Submit a new one */
		bd =3D (struct bcom_gen_bd *) bcom_prepare_next_buffer(rx_bcom);
		bd->status =3D 512;
		bd->buf_pa =3D SPI_rx_bufs.pa;
	=09
		bcom_submit_next_buffer(rx_bcom, NULL);
		bcom_enable(rx_bcom);
	}
	spin_unlock(&priv->dma_lock);
	return IRQ_HANDLED;
};

static irqreturn_t SPI_tx_irq(int irq, void *dev_id) {
	// no need for TaskIntClear(txtask), OS masks and acks IRQ
	struct mpc52xx_spi_priv *priv =3D dev_id;
	struct bcom_gen_bd *bd;

	Node *node;

	if(psc->mpc52xx_psc_status&0x1800) {

		printk("PSC Reset\n");
		psc->command =3D MPC52xx_PSC_RST_RX;
		psc->command =3D MPC52xx_PSC_RST_TX;
		psc->command =3D MPC52xx_PSC_SEL_MODE_REG_1;
		psc->command =3D MPC52xx_PSC_RST_ERR_STAT;
		psc->command =3D MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE;
	};
=09
	spin_lock(&priv->dma_lock);
=09
	for(;;)
	{
		if(!bcom_buffer_done(tx_bcom)) {
			break;
		}
		bcom_retrieve_buffer(tx_bcom, NULL, NULL);
		/* Submit a new one */
		bd =3D (struct bcom_gen_bd *) bcom_prepare_next_buffer(tx_bcom);

		if (snd_SPImgt_running)
		{
			if((FirstNode =3D=3D NULL)) {
				bd->status =3D PERIODSIZE_HW;
				bd->buf_pa =3D SPI_tx_silence.pa;
				bcom_submit_next_buffer(tx_bcom, NULL);
			=09
				if(hook_per_elap !=3D NULL) {
					hook_per_elap(SPI_pos, SPI_play);
				}
			}=20
			else
			{
				node=3DFirstNode;
				FirstNode=3Dnode->next;
				if(FirstNode=3D=3DNULL)LastNode=3DNULL;
				bd->status =3D PERIODSIZE_HW;
				bd->buf_pa =3D (void *)(((u32)node->buffer.pa));
				bcom_submit_next_buffer(tx_bcom, NULL);
				node->next=3DNULL;
				if(LastNodeFree!=3DNULL)
					LastNodeFree->next=3Dnode;
				LastNodeFree=3Dnode;				=09
				if(FirstNodeFree=3D=3DNULL)FirstNodeFree=3DLastNodeFree;
				nodecounter--;
			}
			dmablockcounter++;

		} else {
			bd->status =3D PERIODSIZE_HW;
			bd->buf_pa =3D SPI_tx_silence.pa;
			bcom_submit_next_buffer(tx_bcom, NULL);

		}
		bcom_enable(tx_bcom);

	}
	spin_unlock(&priv->dma_lock);

	return IRQ_HANDLED;
};

typedef struct {
	unsigned short l;
	unsigned short r;
} sample_t;

static int frame=3D0;
static Node *nodebuild;
static int counter =3D0;
static int *ptr=3DNULL;

int snd_SPI_pcm_copy(struct snd_pcm_substream *substream,
		int voice,
		snd_pcm_uframes_t pos,
		void *src,
		snd_pcm_uframes_t count) {

	snd_pcm_uframes_t i;
// 	sample_t* data =3D (sample_t*) src;
	UInteger32 *data =3D (UInteger32 *) src;

	int cnt=3Dcount;
// 	unsigned short aux;

//   	printk("1.cnt %d, frame %d\n",cnt, frame);=20
	while (cnt> 0)
	{
		counter++;
		if(counter =3D=3D 1000){

// 			printk("Frames: %d\n",nodecounter);
			counter=3D0;

		}
		if(ptr=3D=3DNULL)
		{=20

			if(FirstNodeFree !=3D NULL)
			{
				nodebuild =3D FirstNodeFree;
				FirstNodeFree =3D FirstNodeFree->next;
				if(FirstNodeFree=3D=3DNULL)LastNodeFree=3DNULL;	=09
			}
			else
			{		=09
				nodebuild =3D (Node *)kmalloc(sizeof(Node), GFP_KERNEL);=09
				nodebuild->buffer.va =3D kmalloc(PERIODSIZE_HW, GFP_DMA);
				nodebuild->buffer.pa =3D virt_to_phys((void *)nodebuild->buffer.va);
				nodebuild->next=3DNULL;
// 				printk("Getting more Frames buffers, num of nodes %d\n",nodecounter)=
;
			}		=09
			ptr=3D(int *)nodebuild->buffer.va;
			frame=3D0;=09
		}
//   		printk("2.cnt %d, frame %d\n",cnt, frame);=20
		if(cnt>=3D (FPP_HW -frame))
		{

			for(i=3D0;il);
// 				printk(" 0x%04x ",data->r);=09
//Big Endian
// 				aux=3D((data->l>>8)&0xff)+((data->l << 8)&0xff00);
// 				*(ptr+(i*SLOTS)+(frame*SLOTS)) =3D (aux<r>>8)&0xff)+((data->r << 8)&=
0xff00);
// 				*(ptr+(i*SLOTS)+(frame*SLOTS)+1) =3D (aux<l<r<next=3DNULL;
			if(LastNode !=3D NULL) LastNode->next =3D nodebuild;
			if(FirstNode =3D=3D NULL) FirstNode =3D nodebuild;
			LastNode =3D nodebuild;
			nodecounter++;
//   			printk("3.cnt %d, frame %d\n",cnt, frame);=20
		}
		else
		{
			for(i=3D0;il);
// 				printk("%04x ",data->r);
//Big Endian
// 				aux=3D((data->l>>8)&0xff)+((data->l << 8)&0xff00);
// 				*(ptr+(i*SLOTS)+(frame*SLOTS)) =3D (aux<r>>8)&0xff)+((data->r << 8)&=
0xff00);
// 				*(ptr+(i*SLOTS)+(frame*SLOTS)+1) =3D (aux<l<r<tfdata =3D 0xF0010000;=
 		 // Power-down [Table 1, MAX5712 Datasheet]=09

	gpio->port_config |=3D PORT_CONFIG_PSC1;

	cdm->clk_enables |=3D PSC1_CLK_EN;

	cdm->mclken_div_psc1 	=3D 0x8010;

	rx_fifo =3D MPC52xx_PA(MPC52xx_PSCx_OFFSET(psc_num))+0x60;
	tx_fifo =3D MPC52xx_PA(MPC52xx_PSCx_OFFSET(psc_num))+0x80;


	spin_lock_init(&priv->dma_lock);

// 	printk("Before Tasks init\n");

	rx_bcom =3D bcom_gen_bd_rx_init(2, (phys_addr_t)rx_fifo, initiator_rx, BCO=
M_IPR_PSC1_RX, 512);

	tx_bcom =3D bcom_gen_bd_tx_init(8, (phys_addr_t)tx_fifo, initiator_tx, BCO=
M_IPR_PSC1_TX);


	r_irq =3D bcom_get_task_irq(rx_bcom);
	t_irq =3D bcom_get_task_irq(tx_bcom);

	printk("r_irq %d 0x%08x t_irq %d 0x%08x, r_tasknum %d, t_tasknum %d\n", r_=
irq, r_irq, t_irq, t_irq, rx_bcom->tasknum, tx_bcom->tasknum);
	psc->command =3D (MPC52xx_PSC_TX_DISABLE | MPC52xx_PSC_RX_DISABLE);
	psc->command =3D MPC52xx_PSC_RST_RX;
	psc->command =3D MPC52xx_PSC_RST_TX;
	psc->command =3D MPC52xx_PSC_RST_ERR_STAT;

	psc->op1 =3D 0x03;
	udelay(10);
	psc->op0 =3D 0x02;
	udelay(50);
=09
	SICR =3D 0x0F90E000;
=09
	psc->command 	=3D 0x0A;
	psc->sicr	=3D SICR;
	psc->ctur	=3D 0x03;
	psc->ctlr	=3D 0x34;
	psc->ccr	=3D 0x070F0000;

	psc->rfalarm	=3D RX_ALARM;	=09
	psc->tfalarm	=3D TX_ALARM;	=09
	psc->rfcntl	=3D RX_GRAN;	=09
	psc->tfcntl	=3D TX_GRAN;	=09
	psc->isr_imr.isr	=3D 0x00;
	psc->isr_imr.imr	=3D 0x00;=09
	psc->mode	=3D 0x00;			/* set RX interrupt to RxRDY */
	psc->command =3D (MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE);

	psc->tfdata =3D 0xF0010000; 	// Power-down [Table 1, MAX5712 Datasheet]
	udelay(100);=09

	psc->tfdata =3D 0xF0000000; 	// Wake-up [Table 1, MAX5712 Datasheet]	=09

	udelay(100);
=09
// 	printk("Before request_irq's\n");
	if (request_irq(r_irq, &SPI_rx_irq, /*IRQF_DISABLED*/0, "SPI rx dma", priv=
)) {
		printk(KERN_ERR "SPI: SDMA rx irq allocation failed\n");
		return;
	}=20
	if (request_irq(t_irq, &SPI_tx_irq, /*IRQF_DISABLED*/0, "SPI tx dma", priv=
)) {
		printk(KERN_ERR "SPI: SDMA tx irq allocation failed\n");
		return;
	}=20

	bcom_gen_bd_tx_reset(tx_bcom);
	bcom_gen_bd_rx_reset(rx_bcom);

// 	printk("Before submitting a buffer\n");
	spin_lock(&priv->dma_lock);
	while (!bcom_queue_full(tx_bcom)) {
		struct bcom_gen_bd *bd;

		/* Submit a new one */
		bd =3D (struct bcom_gen_bd *) bcom_prepare_next_buffer(tx_bcom);
		bd->status =3D PERIODSIZE_HW;
		bd->buf_pa =3D SPI_tx_silence.pa;
		bcom_submit_next_buffer(tx_bcom, NULL);;
	}
	spin_unlock(&priv->dma_lock);

	bd =3D bcom_prepare_next_buffer(rx_bcom);

	bd->status =3D 512;
	bd->data[0] =3D SPI_rx_bufs.pa;

	bcom_submit_next_buffer(rx_bcom, (void *)SPI_rx_bufs.pa);

	psc->command =3D MPC52xx_PSC_RST_RX;
	psc->command =3D MPC52xx_PSC_RST_TX;
	psc->command =3D MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE;


	bcom_enable(tx_bcom);
	bcom_enable(rx_bcom);

	kt_timeup   =3D timeval_to_ktime(tclockup);
	kt_timedown =3D timeval_to_ktime(tclockdown);
	hrtimer_init(&start_timer, CLOCK_REALTIME, HRTIMER_MODE_REL);=09
	start_timer.function =3D timer_funct;
// 	printk("Before exit in Setup_SPI()\n");
}

void register_period_elapsed(void (*funcptr)()) {
/*	printk("Function registered\n");*/
	hook_per_elap =3D funcptr;
};

void register_hook_frames_rcv(UInteger32 (*funcptr)()) {
/*	printk("Function registered\n");*/
	hook_frames_rcv =3D funcptr;
	hrtimer_start(&start_timer, kt_timeup, HRTIMER_MODE_REL);
};

int snd_SPI_pcm_prepare(struct snd_pcm_substream * substream) {
#ifdef SND_I2S_DEBUG
	snd_pcm_runtime_t *runtime =3D substream->runtime;
	printk("snd_I2Smgt_pcm_prepare\n");
	printk("  runtime->buffer_size=3D%i\n",(int)runtime->buffer_size);
	printk("  runtime->period_size=3D%i\n",(int)runtime->period_size);
	printk("  runtime->periods=3D%i\n",(int)runtime->periods);
#endif
	SPI_play =3D SPI_pos =3D 0;
	return 0;
};

EXPORT_SYMBOL(register_period_elapsed);
EXPORT_SYMBOL(register_hook_frames_rcv);
EXPORT_SYMBOL(snd_SPI_pcm_prepare);


int SPIspeaker_init(void) {

	SPI_buffers_init();
	SPI_setup();
	return 0;
}

void SPIspeaker_exit(void) {

	/* Freeing buffer SPIspeaker */
	if (SPI_rx_bufs.va) {
	kfree(SPI_rx_bufs.va);
	}
	if (SPI_tx_silence.va) {
	kfree(SPI_tx_silence.va);
	}
}

module_init(SPIspeaker_init);
module_exit(SPIspeaker_exit);

MODULE_DESCRIPTION("MPC52xx SPI");
MODULE_AUTHOR("Pedro Dom=EDnguez,,,, (pedro.dominguez@aed-engineering.com)"=
);
MODULE_LICENSE("GPL");

-----------------------------
As I told you, here is the configuration routine for the I2S module. Please=
, notice that this module whas built to work on the old 2.6.16 kernel and o=
ld dma driver:

static int I2S_setup(void) {

	int i;
// 	u32 val32;
	// CDM
	struct mpc52xx_cdm __iomem *cdm;
//=20
// 	/* GPIO Modification */
	struct mpc52xx_gpio __iomem *gpio;

// 	/* END GPIO Modification */
//=20
	cdm =3D ioremap(MPC52xx_PA(MPC52xx_CDM_OFFSET), MPC52xx_CDM_SIZE);
	gpio =3D ioremap(MPC52xx_PA(MPC52xx_GPIO_OFFSET), MPC52xx_GPIO_SIZE);
//=20
	switch(psc_num) {
		case 1:
			initiator_tx =3D SDMA_INITIATOR_PSC1_TX;
			initiator_rx =3D SDMA_INITIATOR_PSC1_RX;
			break;
		case 2:
			initiator_tx =3D SDMA_INITIATOR_PSC2_TX;
			initiator_rx =3D SDMA_INITIATOR_PSC2_RX;
			break;
		default:
			panic("snd-I2Smgt.o: invalid value for psc_num (%i)\n",psc_num);
			break;
	};

	/* 528MHz/(0x1f+1)=3D16.5 MHz */
	cdm->mclken_div_psc2 =3D 0x8001; // Mhz MCLK ( Khz * )
	psc->command =3D (MPC52xx_PSC_TX_DISABLE | MPC52xx_PSC_RX_DISABLE);
	/* PSC2 CODEC with Master Clock */
	gpio->port_config |=3D 0x70;
	/* PSC2 clock enable */
	cdm->clk_enables |=3D 0x40;

	// PSC reset
	psc->command =3D MPC52xx_PSC_RST_RX;
	psc->command =3D MPC52xx_PSC_RST_TX;
 	psc->command =3D MPC52xx_PSC_SEL_MODE_REG_1;
 	psc->command =3D MPC52xx_PSC_RST_ERR_STAT;


	// PSC setup I2S
	psc->mode =3D 0;
	psc->rfalarm =3D RX_ALARM;
 	psc->tfalarm =3D TX_ALARM;
	psc->rfcntl =3D RX_GRAN;
 	psc->tfcntl =3D TX_GRAN;
	psc->mpc52xx_psc_imr =3D 0x0000;

	psc->sicr =3D 0x0FE00000;
	psc->ctur =3D 0x1f; //Frame length 0x17

	psc->ccr =3D 0x3f5D; //LRCK  KHz, BitCLK  MHz  0x3f05!

// 	psc->sicr |=3D /* DELAY_TIME_SLOT |*/ MULTIWD_ENABLE | CLK_POL_RISING;
// =09
// 	psc->sicr |=3D GEN_CLK_INT;

	psc->command =3D MPC52xx_PSC_RST_RX;
	psc->command =3D MPC52xx_PSC_RST_TX;
	psc->command =3D MPC52xx_PSC_SEL_MODE_REG_1;
	psc->command =3D MPC52xx_PSC_RST_ERR_STAT;
//=20
// 	// setup the sdma tasks
	tx_sdma =3D sdma_alloc(PERIODS_HW+1);
	rx_sdma =3D sdma_alloc(PERIODS_HW+1);

	if (!tx_sdma || !rx_sdma) {
		printk("sdma_alloc failed\n");
		return -ENOMEM;
	}
//=20
// 	sdma_gen_bd_rx_init(rx_sdma, (phys_addr_t)&(psc->rfdata), PERIODSIZE_HW=
, initiator_rx, 6);
	sdma_gen_bd_rx_init(0, rx_sdma, (phys_addr_t)&(psc->rfdata), initiator_rx,=
 6, PERIODSIZE_HW);
// 	sdma_gen_bd_tx_init(tx_sdma, (phys_addr_t)&(psc->tfdata), PERIODSIZE_HW=
, initiator_tx, 6);
	sdma_gen_bd_tx_init(0, tx_sdma, (phys_addr_t)&(psc->tfdata), initiator_tx,=
 6);

	printk("txtask is %d rxtask is %d\n", tx_sdma->tasknum, rx_sdma->tasknum);
//=20
	// prepare the ring buffers
	for(i=3D0;itasknum %d\n", sdma_irq(rx_sdma), MPC52xx_SDMA_IRQ_BASE + rx_sd=
ma->tasknum);
	if (request_irq(sdma_irq(rx_sdma), I2S_rx_irq, 0, "SPI rx dma", NULL)) {
		printk(KERN_ERR "SPI: SDMA rx irq allocation failed\n");
		return -EINVAL;
	} else printk("SPI: SDA rx irq allocation succeded\n");
	if (request_irq(sdma_irq(tx_sdma), I2S_tx_irq, 0, "SPI tx dma", NULL)) {
		printk(KERN_ERR "SPI: SDMA tx irq allocation failed\n");
		return -EINVAL;
	} else printk("SPI: SDA tx irq allocation succeded\n");
=09
//=20
// 	// clear any pending interrupts
	sdma_clear_irq(tx_sdma);
	sdma_clear_irq(rx_sdma);
//=20
	printk("Before activating the tasks\n");
// 	// activate the tasks
// 	sdma_enable(tx_sdma);
// 	sdma_enable(rx_sdma);
//=20
// 	printk("about to enable SPI psc\n");
	udelay(100);
//=20
// 	// enable transmitter and receiver
	psc->command =3D MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE;
// //	psc->command =3D MPC52xx_PSC_TX_ENABLE;
//=20
//=20
// // 	I2S_print(__FUNCTION__);
//=20
// // 	pcm1680_read();
// //         pcm1680_configure(44100);
// // 	pcm1680_read();

	return 0;
};



>=20
> Angelo wrote:
>> Timur wrote:
>>>I wrote an ASoC driver for the MPC8610, which also has
>>>an I2S interface.  You can find it in sound/soc/fsl.
>>
>> in my kernel version (2.6.22) there isn't any folder named
>> fsl in sound/soc/
>=20
>> Timur wrote:
>> It's in 2.6.25.
>=20
>=20
> The main problem is that in the feature of MPC8610 you can find:
>   Two synchronous serial interface (SSI) controllers for I2S or AC97
>   audio inputs/outputs
> while in MPC5200b's feature there's only:
>   I2S (up to three)
> However the main difference features:
> MPC5200B: http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=
=3DMPC5200B&nodeId=3D0162468rH3bTdG0898
> MPC8610:
> http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=3DMPC8610
>=20
> What do you think on this difference?
>=20
>=20
>=20
> ________________________________
> ________________________________
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RE: I2S driver

[Angelo]

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Pedro wrote:
 Ok, here down is the code I told you.
A few considerations before:
 - As I told you, it is very bad commented, sorry. I'm still working on it.
 - It's is not an alsa driver, but it copies data to the PSC working as SPI mode (it is not I2S but you only need to change the PSC configuration).
 - Its purpose is to establish a dma task to copy the data from a buffer to the PSC, where I had attached a Digital to Analog Converter that into sound through a speaker.
 - Data alignment is imposed by DAC requirements.
 - Clock configuration is fixed to 44.1 Khz, so audio data must be sampled using that frequency. Data must be also mono (only one converter attached).
 - This module is part of a mayor project to stream audio data through ethernet, so it provides a function to copy audio data to audio buffers. If there's no data to copy, it copies a null buffer to keep silence.
 - What can you find useful in this code? Configuration steps to establish DMA Tasks and PSC configuration.
 - After the module I send you also the code from another module that establishes PSC as I2S configuration. Clocks where adjusted to send the audio data also at 44.1 Khz as fine tunned as possible due to communication requirements of the attached DAC in that hardware.

And finally, here is the code:

#define SPI_DBG

#ifdef SPI_DBG
#define DBG(x...) printk("(debug) " x)
#else
#define DBG(x...)
#endif

#include 
#include 
#include 
#include 
#include 
#include 
.....
 Thanks for code.
 But why i can't see library?
 
 >After the module I send you also the code from another module that >establishes PSC as I2S configuration. Clocks where adjusted to send >the audio data also at 44.1 Khz as fine tunned as possible due to >communication requirements of the attached DAC in that hardware.
 You'll send me another code?
 
 And what about my file lite5200b.dts?
 I must enable some like this?
         // PSC3 in CODEC mode example
         //i2s@2400 {        // PSC3
         //    device_type = "sound";
         //    compatible = "mpc5200b-psc-i2s";//not 5200 compatible
         //    cell-index = <2>;
         //    reg = <2400 100>;
         //    interrupts = <2 3 0>;
         //    interrupt-parent = <&mpc5200_pic>;
         //};


       
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[-- Attachment #2: Type: text/html, Size: 3206 bytes --]

RE: I2S driver

[Pedro Luis D. L.]

Angelo wrote:

> Thanks for code.
> But why i can't see library?

Which library do you mean? I don't understand, sorry.
=20
>>After the module I send you also the code from another module that>establ=
ishes PSC as I2S configuration. Clocks where adjusted to send>the audio dat=
a also at 44.1 Khz as fine tunned as possible due to>communication requirem=
ents of the attached DAC in that hardware.
> You'll send me another code?

This code was already in my previous email. After "------------------------=
-------------------" at the end of the email. Check it again, hehehe.

> And what about my file lite5200b.dts?
> I must enable some like this?
>         // PSC3 in CODEC mode example
>         //i2s@2400 {        // PSC3
>         //    device_type =3D "sound";
>         //    compatible =3D "mpc5200b-psc-i2s";//not 5200 compatible
>         //    cell-index =3D ;
>         //    reg =3D ;
>         //    interrupts =3D ;
>         //    interrupt-parent =3D <&mpc5200_pic>;
>         //};

I didn't need it. :-)

>=20
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RE: I2S driver

[Angelo]

[-- Attachment #1: Type: text/plain, Size: 298 bytes --]


Pedro wrote:
>Which library do you mean? I don't understand, sorry.

In your previous mail (with code), each lines with an "#include " don't show the name of header file.

thanks




       
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[-- Attachment #2: Type: text/html, Size: 472 bytes --]

RE: I2S driver

[Angelo]

[-- Attachment #1: Type: text/html, Size: 8941 bytes --]

RE: I2S driver

[Pedro Luis D. L.]

[-- Attachment #1: Type: text/plain, Size: 504 bytes --]


Angelo wrote:
>
> Pedro wrote:
>>Which library do you mean? I don't understand, sorry.
>
> In your previous mail (with code), each lines with an "#include " don't show the name of header file.
>
> thanks
>
Ups! Sorry, I send the code as an attached file, then.
>
>
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[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #2: mpc52xx_spi.c --]
[-- Type: text/x-csrc, Size: 18977 bytes --]

/***************************************************************************
 *   Copyright (C) 2007 by Pedro L. Domínguez                              *
 *   pedro.dominguez@aed-engineering.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.             *
 *                                                                         *
 *   History                                                               *
 *     Original Version by Bernhard Kuhn <bkuhn@freescale.com>             *
 *            for 2.6.16 kernel                                            *
 ***************************************************************************/

#define SPI_DBG

#ifdef SPI_DBG
#define DBG(x...) printk("(debug) " x)
#else
#define DBG(x...)
#endif

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/proc_fs.h>
#include <linux/fcntl.h>
#include <linux/spinlock.h>
#include <linux/platform_device.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <linux/string.h>
#include <linux/autoconf.h>
#include <linux/timer.h>
#include <linux/init.h>
#include <linux/version.h>
#include <linux/sched.h>
#include <linux/smp_lock.h>
#include <linux/miscdevice.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/ioport.h>
#include <linux/poll.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <asm/delay.h>
#include <asm/mpc52xx.h>
#include <asm/mpc52xx_psc.h>
#include <asm/of_platform.h>
#include <sysdev/bestcomm/bestcomm.h>
#include <sysdev/bestcomm/gen_bd.h>
#include <sysdev/bestcomm/bestcomm_priv.h>
#include <sound/pcm.h>
#include <sound/asound.h>
// #include <sound/typedefs.h>

#define BPF             2      // bytes per frame
#define SLOTS           2
#define SAMPLESIZE      (BPF*SLOTS)
#define FPP             1024   // bytes per copy period 
#define PERIODS         8      // periods
#define PERIODSIZE      (SAMPLESIZE/2*FPP)
#define BUFSIZE         (SAMPLESIZE*FPP*PERIODS)
#define FPP_HW          128
//512    // 10 ms
#define PERIODS_HW      8      // periods
#define PERIODSIZE_HW   (SAMPLESIZE*FPP_HW)

#define FIFOSIZE	512
#define RX_GRAN		4
#define TX_GRAN		4
#define	RX_ALARM	0x120
#define	TX_ALARM	FIFOSIZE - (TX_GRAN * 4) - 208

#define DELAY_TIME_SLOT 0x20000000
#define GEN_CLK_INT 0x00800000
#define MULTIWD_ENABLE 0x00400000
#define CLK_POL_RISING 0x00200000

#define PROCFS_NAME	"MPC52xx_SPI"
#define MCLKEN_DIV 0x8001
#define DRV_NAME "mpc52xx-psc-spi"
#define PROCFS_MAX_SIZE		1024
#define BUF_FRAMES 300

/* MBAR position */
#define MPC52xx_MBAR		0xf0000000	/* Phys address */
#define MPC52xx_MBAR_VIRT	0xf0000000	/* Virt address */
#define MPC52xx_MBAR_SIZE	0x00010000

#define MPC52xx_PA(x)		((phys_addr_t)(MPC52xx_MBAR + (x)))
#define MPC52xx_VA(x)		((void __iomem *)(MPC52xx_MBAR_VIRT + (x)))

/* Registers zone offset/size  */
#define MPC52xx_MMAP_CTL_OFFSET		0x0000
#define MPC52xx_MMAP_CTL_SIZE		0x068
#define MPC52xx_SDRAM_OFFSET		0x0100
#define MPC52xx_SDRAM_SIZE		0x010
#define MPC52xx_CDM_OFFSET		0x0200
#define MPC52xx_CDM_SIZE		0x038
#define MPC52xx_INTR_OFFSET		0x0500
#define MPC52xx_INTR_SIZE		0x04c
#define MPC52xx_GPTx_OFFSET(x)		(0x0600 + ((x)<<4))
#define MPC52xx_GPT_SIZE		0x010
#define MPC52xx_RTC_OFFSET		0x0800
#define MPC52xx_RTC_SIZE		0x024
#define MPC52xx_GPIO_OFFSET		0x0b00
#define MPC52xx_GPIO_SIZE		0x040
#define MPC52xx_GPIO_WKUP_OFFSET	0x0c00
#define MPC52xx_GPIO_WKUP_SIZE		0x028
#define MPC52xx_PCI_OFFSET		0x0d00
#define MPC52xx_PCI_SIZE		0x100
#define MPC52xx_SDMA_OFFSET		0x1200
#define MPC52xx_SDMA_SIZE		0x100
#define MPC52xx_XLB_OFFSET		0x1f00
#define MPC52xx_XLB_SIZE		0x100
#define MPC52xx_PSCx_OFFSET(x)		(((x)!=6)?(0x1e00+((x)<<9)):0x2c00)
#define MPC52xx_PSC_SIZE		0x0a0
#define PORT_CONFIG_PSC1		0x00000006
#define PSC1_CLK_EN			0x00000020

typedef unsigned long		uint32;
typedef unsigned long		UInteger32;
typedef unsigned short 		UInteger16;

struct proc_dir_entry *Our_Proc_File;

struct SPI_buffer {
	char *va;
	dma_addr_t pa;
};

static struct SPI_buffer SPI_tx_silence;
static struct SPI_buffer SPI_rx_bufs;

typedef struct _node {
   struct SPI_buffer buffer;
   struct _node *next;
} Node;

static Node *LastNode;
static Node *FirstNode;
Node *FirstNodeFree;
Node *LastNodeFree;

struct bcom_task *tx_bcom;
struct bcom_task *rx_bcom;
int r_irq;
int t_irq;

struct mpc52xx_psc *psc;

struct mpc52xx_spi_priv {
	struct device *dev;
	resource_size_t	mem_start;
	resource_size_t mem_len;
	int irq;
	struct mpc52xx_psc __iomem *psc;

	struct bcom_task *tsk_tx;
	spinlock_t dma_lock;

	int period_byte_size;
	u32 period_start, period_end, period_next_p;
};

static int initiator_tx;
static int initiator_rx;

static struct snd_pcm_substream *snd_SPI_substream;
static int snd_SPImgt_running = 0;
static int snd_SPImgt_started = 2;
static int SPI_pos = 0;
static int SPI_play = 0;
static int nodecounter=0;
static unsigned int dmablockcounter=0;

static struct hrtimer start_timer;
static struct timeval tclockup = {.tv_sec = 1,.tv_usec = 0};
static struct timeval tclockdown= {.tv_sec = 0,.tv_usec = 615080};
static ktime_t kt_timedown, kt_timeup ;

void (*hook_per_elap)(int, int);
UInteger32 (*hook_frames_rcv)(void);

int SPI_buffers_init(void) {
	int i;
 	Node *node;


	FirstNodeFree = (Node *)kmalloc(sizeof(Node), GFP_KERNEL);	
	FirstNodeFree->buffer.va = kmalloc(PERIODSIZE_HW, GFP_DMA);
	FirstNodeFree->buffer.pa = virt_to_phys((void *)FirstNodeFree->buffer.va);
	node = FirstNodeFree;

	for (i=1;i<BUF_FRAMES;i++)
	{
		node->next = (Node *)kmalloc(sizeof(Node), GFP_KERNEL);	
		node->next->buffer.va = kmalloc(PERIODSIZE_HW, GFP_DMA);
		node->next->buffer.pa = virt_to_phys((void *)node->next->buffer.va);
		node = node->next;
	}
	LastNodeFree = node;
	LastNodeFree->next=NULL;
	DBG("SPI_buffers_init()\n");
	// prepare reception buffer	
	SPI_rx_bufs.va = kmalloc(BUFSIZE, GFP_DMA);

	SPI_rx_bufs.pa = virt_to_phys((void *)SPI_rx_bufs.va);

	// prepare silence buffer
	SPI_tx_silence.va = kmalloc(BUFSIZE, GFP_DMA);

	SPI_tx_silence.pa = virt_to_phys((void *)SPI_tx_silence.va);

	memset(SPI_tx_silence.va,0,BUFSIZE);

	return 0;
}

int snd_SPI_pcm_trigger(struct snd_pcm_substream *substream, int cmd) {
#ifdef SND_I2S_DEBUG
	printk("snd_SPI_pcm_trigger\n");
#endif
	switch (cmd) {
		case SNDRV_PCM_TRIGGER_START:
		case SNDRV_PCM_TRIGGER_RESUME:
#ifdef SND_I2S_DEBUG
			printk("START\n");
#endif
			snd_SPI_substream=substream;
			snd_SPImgt_started=2;
			snd_SPImgt_running=1;

			break;
		case SNDRV_PCM_TRIGGER_STOP:
		case SNDRV_PCM_TRIGGER_SUSPEND:
#ifdef SND_I2S_DEBUG
			printk("STOP\n");
#endif
			snd_SPImgt_running=0;
			break;

		case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
			printk("  PAUSE_PUSH\n");
			break;
		case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
			printk("  PAUSE_RELEASE\n");
			break;
		default:
			return -EINVAL;
	}
	return 0;
};

EXPORT_SYMBOL(snd_SPI_pcm_trigger);


static irqreturn_t SPI_rx_irq(int irq, void *dev_id) {
	// no need for TaskIntClear(rxtask), OS masks and acks IRQ

	struct mpc52xx_spi_priv *priv = dev_id;

	spin_lock(&priv->dma_lock);
	while (bcom_buffer_done(rx_bcom)) {
		struct bcom_gen_bd *bd;
		bcom_retrieve_buffer(rx_bcom, NULL, NULL);
		/* Submit a new one */
		bd = (struct bcom_gen_bd *) bcom_prepare_next_buffer(rx_bcom);
		bd->status = 512;
		bd->buf_pa = SPI_rx_bufs.pa;
		
		bcom_submit_next_buffer(rx_bcom, NULL);
		bcom_enable(rx_bcom);
	}
	spin_unlock(&priv->dma_lock);
	return IRQ_HANDLED;
};

static irqreturn_t SPI_tx_irq(int irq, void *dev_id) {
	// no need for TaskIntClear(txtask), OS masks and acks IRQ
	struct mpc52xx_spi_priv *priv = dev_id;
	struct bcom_gen_bd *bd;

	Node *node;

	if(psc->mpc52xx_psc_status&0x1800) {

		printk("PSC Reset\n");
		psc->command = MPC52xx_PSC_RST_RX;
		psc->command = MPC52xx_PSC_RST_TX;
		psc->command = MPC52xx_PSC_SEL_MODE_REG_1;
		psc->command = MPC52xx_PSC_RST_ERR_STAT;
		psc->command = MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE;
	};
	
	spin_lock(&priv->dma_lock);
	
	for(;;)
	{
		if(!bcom_buffer_done(tx_bcom)) {
			break;
		}
		bcom_retrieve_buffer(tx_bcom, NULL, NULL);
		/* Submit a new one */
		bd = (struct bcom_gen_bd *) bcom_prepare_next_buffer(tx_bcom);

		if (snd_SPImgt_running)
		{
			if((FirstNode == NULL)) {
				bd->status = PERIODSIZE_HW;
				bd->buf_pa = SPI_tx_silence.pa;
				bcom_submit_next_buffer(tx_bcom, NULL);
				
				if(hook_per_elap != NULL) {
					hook_per_elap(SPI_pos, SPI_play);
				}
			} 
			else
			{
				node=FirstNode;
				FirstNode=node->next;
				if(FirstNode==NULL)LastNode=NULL;
				bd->status = PERIODSIZE_HW;
				bd->buf_pa = (void *)(((u32)node->buffer.pa));
				bcom_submit_next_buffer(tx_bcom, NULL);
				node->next=NULL;
				if(LastNodeFree!=NULL)
					LastNodeFree->next=node;
				LastNodeFree=node;					
				if(FirstNodeFree==NULL)FirstNodeFree=LastNodeFree;
				nodecounter--;
			}
			dmablockcounter++;

		} else {
			bd->status = PERIODSIZE_HW;
			bd->buf_pa = SPI_tx_silence.pa;
			bcom_submit_next_buffer(tx_bcom, NULL);

		}
		bcom_enable(tx_bcom);

	}
	spin_unlock(&priv->dma_lock);

	return IRQ_HANDLED;
};

typedef struct {
	unsigned short l;
	unsigned short r;
} sample_t;

static int frame=0;
static Node *nodebuild;
static int counter =0;
static int *ptr=NULL;

int snd_SPI_pcm_copy(struct snd_pcm_substream *substream,
		int voice,
		snd_pcm_uframes_t pos,
		void *src,
		snd_pcm_uframes_t count) {

	snd_pcm_uframes_t i;
// 	sample_t* data = (sample_t*) src;
	UInteger32 *data = (UInteger32 *) src;

	int cnt=count;
// 	unsigned short aux;

//   	printk("1.cnt %d, frame %d\n",cnt, frame); 
	while (cnt > 0)
	{
		counter++;
		if(counter == 1000){

// 			printk("Frames: %d\n",nodecounter);
			counter=0;

		}
		if(ptr==NULL)
		{ 

			if(FirstNodeFree != NULL)
			{
				nodebuild = FirstNodeFree;
				FirstNodeFree = FirstNodeFree->next;
				if(FirstNodeFree==NULL)LastNodeFree=NULL;		
			}
			else
			{			
				nodebuild = (Node *)kmalloc(sizeof(Node), GFP_KERNEL);	
				nodebuild->buffer.va = kmalloc(PERIODSIZE_HW, GFP_DMA);
				nodebuild->buffer.pa = virt_to_phys((void *)nodebuild->buffer.va);
				nodebuild->next=NULL;
// 				printk("Getting more Frames buffers, num of nodes %d\n",nodecounter);
			}			
			ptr=(int *)nodebuild->buffer.va;
			frame=0;	
		}
//   		printk("2.cnt %d, frame %d\n",cnt, frame); 
		if(cnt >= (FPP_HW -frame))
		{

			for(i=0;i<(FPP_HW-frame);i++) {
// 				printk(" 0x%04x ",data->l);
// 				printk(" 0x%04x ",data->r);	
//Big Endian
// 				aux=((data->l>>8)&0xff)+((data->l << 8)&0xff00);
// 				*(ptr+(i*SLOTS)+(frame*SLOTS)) = (aux<<16);
// 				aux=((data->r>>8)&0xff)+((data->r << 8)&0xff00);
// 				*(ptr+(i*SLOTS)+(frame*SLOTS)+1) = (aux<<16);
//Little Endian
// 				*(ptr+(i*SLOTS)+(frame*SLOTS)) = (data->l<<16);
// 				*(ptr+(i*SLOTS)+(frame*SLOTS)+1) = (data->r<<16);
//Raw Data			
// 				printk("src: 0x%08x\n", *(UInteger32 *)data);
				*(ptr+i) = *(UInteger32 *)data;
				data++;
			};
			cnt=cnt-(FPP_HW-frame);
			frame=0;			
			ptr=NULL;
			nodebuild->next=NULL;
			if(LastNode != NULL) LastNode->next = nodebuild;
			if(FirstNode == NULL) FirstNode = nodebuild;
			LastNode = nodebuild;
			nodecounter++;
//   			printk("3.cnt %d, frame %d\n",cnt, frame); 
		}
		else
		{
			for(i=0;i<cnt;i++) {
// 				printk("%04x ",data->l);
// 				printk("%04x ",data->r);
//Big Endian
// 				aux=((data->l>>8)&0xff)+((data->l << 8)&0xff00);
// 				*(ptr+(i*SLOTS)+(frame*SLOTS)) = (aux<<16);
// 				aux=((data->r>>8)&0xff)+((data->r << 8)&0xff00);
// 				*(ptr+(i*SLOTS)+(frame*SLOTS)+1) = (aux<<16);
//Little Endian
// 				*(ptr+(i*SLOTS)+(frame*SLOTS)) = (data->l<<16);
// 				*(ptr+(i*SLOTS)+(frame*SLOTS)+1) = (data->r<<16);
//Raw Data
				*(ptr+i) = *(UInteger32 *)data;
				data++;
// 				printk("f\n");
			}
			frame=cnt+frame;
			cnt=0;
//   			printk("4.cnt %d, frame %d\n",cnt, frame); 
		}					
	}
	return 0;
};

EXPORT_SYMBOL(snd_SPI_pcm_copy);

static enum hrtimer_restart timer_funct (void *data) {

	static unsigned int counter = 0;
	static unsigned int start = 0;
	UInteger32 framesnum;
	static int diff=0;

	counter = dmablockcounter*128;
	dmablockcounter=0;
	framesnum=hook_frames_rcv();
// 	printk("Frequenz=%d\n",framesnum);
	if(snd_SPImgt_running){
		diff=diff+counter-framesnum;
		start=1;
		
	
	}
	else
	{
		start=0;
	}
	hrtimer_forward(&start_timer, hrtimer_cb_get_time(&start_timer),kt_timeup);

	return HRTIMER_RESTART;
}

static void SPI_setup(void)
{
// 	printk("SPI_setup()\n");
	int psc_num = 1, rv;
	phys_addr_t rx_fifo;
	phys_addr_t tx_fifo;
	struct bcom_bd *bd;
	struct mpc52xx_spi_priv *priv;
	uint32 SICR;
	struct mpc52xx_cdm __iomem *cdm;

	priv = (struct mpc52xx_spi_priv *)kmalloc(sizeof(struct mpc52xx_spi_priv), GFP_KERNEL);

	struct mpc52xx_gpio __iomem *gpio =
		(struct mpc52xx_gpio __iomem *) MPC52xx_PA(MPC52xx_GPIO_OFFSET);

	switch(psc_num) {
		case 1:
			initiator_tx = BCOM_INITIATOR_PSC1_TX;
			initiator_rx = BCOM_INITIATOR_PSC1_RX;
			break;
		case 2:
			initiator_tx = BCOM_INITIATOR_PSC2_TX;
			initiator_rx = BCOM_INITIATOR_PSC2_RX;
			break;
		default:
			panic("snd-SPImgt.o: invalid value for psc_num (%i)\n",psc_num);
			break;
	};

// 	printk("Before request mem region\n");
	if (!request_mem_region(0xF0002000, 0x00000100, DRV_NAME)) {
		printk(KERN_ERR DRV_NAME ": request_mem_region failed\n");
		rv = -EBUSY;
	}

// 	printk("Before ioremaps\n");
	psc = ioremap(MPC52xx_PA(MPC52xx_PSCx_OFFSET(1)), MPC52xx_PSC_SIZE);
	gpio = ioremap(MPC52xx_PA(MPC52xx_GPIO_OFFSET), MPC52xx_GPIO_SIZE);
	cdm = ioremap(MPC52xx_PA(MPC52xx_CDM_OFFSET), MPC52xx_CDM_SIZE);

	psc->tfdata = 0xF0010000; 		 // Power-down [Table 1, MAX5712 Datasheet]	

	gpio->port_config |= PORT_CONFIG_PSC1;

	cdm->clk_enables |= PSC1_CLK_EN;

	cdm->mclken_div_psc1 	= 0x8010;

	rx_fifo = MPC52xx_PA(MPC52xx_PSCx_OFFSET(psc_num))+0x60;
	tx_fifo = MPC52xx_PA(MPC52xx_PSCx_OFFSET(psc_num))+0x80;


	spin_lock_init(&priv->dma_lock);

// 	printk("Before Tasks init\n");

	rx_bcom = bcom_gen_bd_rx_init(2, (phys_addr_t)rx_fifo, initiator_rx, BCOM_IPR_PSC1_RX, 512);

	tx_bcom = bcom_gen_bd_tx_init(8, (phys_addr_t)tx_fifo, initiator_tx, BCOM_IPR_PSC1_TX);


	r_irq = bcom_get_task_irq(rx_bcom);
	t_irq = bcom_get_task_irq(tx_bcom);

	printk("r_irq %d 0x%08x t_irq %d 0x%08x, r_tasknum %d, t_tasknum %d\n", r_irq, r_irq, t_irq, t_irq, rx_bcom->tasknum, tx_bcom->tasknum);
	psc->command = (MPC52xx_PSC_TX_DISABLE | MPC52xx_PSC_RX_DISABLE);
	psc->command = MPC52xx_PSC_RST_RX;
	psc->command = MPC52xx_PSC_RST_TX;
	psc->command = MPC52xx_PSC_RST_ERR_STAT;

	psc->op1 = 0x03;
	udelay(10);
	psc->op0 = 0x02;
	udelay(50);
	
	SICR = 0x0F90E000;
	
	psc->command 	= 0x0A;
	psc->sicr	= SICR;
	psc->ctur	= 0x03;
	psc->ctlr	= 0x34;
	psc->ccr	= 0x070F0000;

	psc->rfalarm	= RX_ALARM;		
	psc->tfalarm	= TX_ALARM;		
	psc->rfcntl	= RX_GRAN;		
	psc->tfcntl	= TX_GRAN;		
	psc->isr_imr.isr	= 0x00;
	psc->isr_imr.imr	= 0x00;	
	psc->mode	= 0x00;			/* set RX interrupt to RxRDY */
	psc->command = (MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE);

	psc->tfdata = 0xF0010000; 	// Power-down [Table 1, MAX5712 Datasheet]
	udelay(100);	

	psc->tfdata = 0xF0000000; 	// Wake-up [Table 1, MAX5712 Datasheet]		

	udelay(100);
	
// 	printk("Before request_irq's\n");
	if (request_irq(r_irq, &SPI_rx_irq, /*IRQF_DISABLED*/0, "SPI rx dma", priv)) {
		printk(KERN_ERR "SPI: SDMA rx irq allocation failed\n");
		return;
	} 
	if (request_irq(t_irq, &SPI_tx_irq, /*IRQF_DISABLED*/0, "SPI tx dma", priv)) {
		printk(KERN_ERR "SPI: SDMA tx irq allocation failed\n");
		return;
	} 

	bcom_gen_bd_tx_reset(tx_bcom);
	bcom_gen_bd_rx_reset(rx_bcom);

// 	printk("Before submitting a buffer\n");
	spin_lock(&priv->dma_lock);
	while (!bcom_queue_full(tx_bcom)) {
		struct bcom_gen_bd *bd;

		/* Submit a new one */
		bd = (struct bcom_gen_bd *) bcom_prepare_next_buffer(tx_bcom);
		bd->status = PERIODSIZE_HW;
		bd->buf_pa = SPI_tx_silence.pa;
		bcom_submit_next_buffer(tx_bcom, NULL);;
	}
	spin_unlock(&priv->dma_lock);

	bd = bcom_prepare_next_buffer(rx_bcom);

	bd->status = 512;
	bd->data[0] = SPI_rx_bufs.pa;

	bcom_submit_next_buffer(rx_bcom, (void *)SPI_rx_bufs.pa);

	psc->command = MPC52xx_PSC_RST_RX;
	psc->command = MPC52xx_PSC_RST_TX;
	psc->command = MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE;


	bcom_enable(tx_bcom);
	bcom_enable(rx_bcom);

	kt_timeup   = timeval_to_ktime(tclockup);
	kt_timedown = timeval_to_ktime(tclockdown);
	hrtimer_init(&start_timer, CLOCK_REALTIME, HRTIMER_MODE_REL);	
	start_timer.function = timer_funct;
// 	printk("Before exit in Setup_SPI()\n");
}

void register_period_elapsed(void (*funcptr)()) {
/*	printk("Function registered\n");*/
	hook_per_elap = funcptr;
};

void register_hook_frames_rcv(UInteger32 (*funcptr)()) {
/*	printk("Function registered\n");*/
	hook_frames_rcv = funcptr;
	hrtimer_start(&start_timer, kt_timeup, HRTIMER_MODE_REL);
};

int snd_SPI_pcm_prepare(struct snd_pcm_substream * substream) {
#ifdef SND_I2S_DEBUG
	snd_pcm_runtime_t *runtime = substream->runtime;
	printk("snd_I2Smgt_pcm_prepare\n");
	printk("  runtime->buffer_size=%i\n",(int)runtime->buffer_size);
	printk("  runtime->period_size=%i\n",(int)runtime->period_size);
	printk("  runtime->periods=%i\n",(int)runtime->periods);
#endif
	SPI_play = SPI_pos = 0;
	return 0;
};

EXPORT_SYMBOL(register_period_elapsed);
EXPORT_SYMBOL(register_hook_frames_rcv);
EXPORT_SYMBOL(snd_SPI_pcm_prepare);


int SPIspeaker_init(void) {

	SPI_buffers_init();
	SPI_setup();
	return 0;
}

void SPIspeaker_exit(void) {

	/* Freeing buffer SPIspeaker */
	if (SPI_rx_bufs.va) {
	kfree(SPI_rx_bufs.va);
	}
	if (SPI_tx_silence.va) {
	kfree(SPI_tx_silence.va);
	}
}

module_init(SPIspeaker_init);
module_exit(SPIspeaker_exit);

MODULE_DESCRIPTION("MPC52xx SPI");
MODULE_AUTHOR("Pedro Domínguez,,,, (pedro.dominguez@aed-engineering.com)");
MODULE_LICENSE("GPL");

RE: I2S driver

[Angelo]

[-- Attachment #1: Type: text/plain, Size: 393 bytes --]


how can i take these headers file?

> Pedro wrote: 
> #include <sysdev/bestcomm/bestcomm.h>
> #include <sysdev/bestcomm/gen_bd.h>
> #include <sysdev/bestcomm/bestcomm_priv.h>


I try to download some kernel version (2.6.23 and 2.6.24) but there aren't any library of bestcomm.

Many thanks.




       
---------------------------------
Inviato da Yahoo! Mail.
La web mail più usata al mondo.

[-- Attachment #2: Type: text/html, Size: 751 bytes --]

RE: I2S driver

[Pedro Luis D. L.]

Angelo wrote:

> how can i take these headers file?
>=20
>> Pedro wrote:
>> #include=20
>> #include=20
>> #include=20
>=20
> I try to download some kernel version (2.6.23 and 2.6.24) but there aren'=
t any library of bestcomm.
>=20
> Many thanks.
>=20
You can get the patches from:

http://patchwork.ozlabs.org/linuxppc/list?q=3Dbestcomm&order=3Ddate

Regards,

Pedro L.
>=20
> ________________________________
> Inviato da Yahoo! Mail.
> La web mail pi=F9 usata al mondo.

_________________________________________________________________
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