DSP2ARM communication driver can't insmod

xiaop

Hi, all

I want to achieve Dual Core Communication between DSP Core0 and ARM Core0. In ARM side, run Linux OS while DSP side run No OS program. Dual core communication finished by configure interrupts each side. In ARM side, I need configure interrupts through Linux driver. In my driver, I have configured the GIC-400 registers for IPCGR0, which is 4# SPI event. The configuration of GIC register is according to the NO OS IPC demo downloaded from TI forum, which is work fine.

I have compiler my driver by using cross compiler within Linux kernel 4.1.8 come with mcsdk3.1.4.7 successfully, however, when I install driver by using command

insmod ./DSP2ARMdri.ko

Linux console is can't work anymore, it seem that Linux system halted. I can't find the reason of this.

Is my driver wrong, or the configuration of GIC-400 is wrong in Linux driver.

(1) I build the kernel by using the configuration file in /arch/arm/configs/tisdk-k2k-deconfig

(2)SDK version:MCSDK3.1.4.7

(3)Driver source file is DSP2ARMdri.c and DSP2ARMdri.h

Thanks in advance

------------------------------------

Yours,

xiaop

over 7 years ago

0 Cvetolin Shulev-XID over 7 years ago

TI__Guru 65405 points

Hi Xiaop,

I've forwarded this to the software experts. Their feedback should be posted here.

BR
Tsvetolin Shulev

0 Michael Scherban over 7 years ago

TI__Genius 12320 points

Hi Xiaop,

Can you use printk's in your module to see where the hang happens at?

It might be risky to reprogram the GIC during runtime, as Linux is using it.

Regards,

Mike

0 xiaop over 7 years ago in reply to Michael Scherban

Intellectual 260 points

Hi, Mike

First of all, thank for your response.

I have test my driver in steps below:

(1) Insmod DSP2ARMdri.ko

(2)run dsp demo by using mpmcl

(3)run linux user space program named armapp

However, when I implement the 1st step, it can't work anymore. The linux console is halt, and can't excute any

command anymore, just print some unexceptly message. Here is the print mesage when I insmod the driver.

It it clear the driver has finish the initialization process, however then it is wrong, which I can't figure it out. I want

to know whether I can solve the problem. I think there is a risky between my driver and the cofiguration within IPC

components.

Do you have any advice to archieve the communication between ARM and DSP in this way?

Here I post my linux user space source file here

armapp.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>

#include <sys/stat.h>
#include <sys/mman.h>
#include <sys/ioctl.h>
#include <sys/types.h>

/* Using 'k' as magic number */
#define ARM2DSP_IOC_MAGIC   'k'
/* Give DSP interrupt commmand */
#define ARM2DSP_IOC_IRQ     _IO(ARM2DSP_IOC_MAGIC,0)
/* Max ioctl command number */
#define ARM2DSP_IOC_MAXNR   1

int main (void)
{
	int ret = 0;
	unsigned char irqno = 0;

	char* dsp2arm_dev = "/dev/DSP2ARM_DEVICE";
	int dsp2arm_fd = 0;

	/* open dsp2arm device */
	dsp2arm_fd = open(dsp2arm_dev, O_RDWR);
	if (dsp2arm_fd == -1)
	{
		printf("Error: cannot open DSP2ARM_DEVICE\n");
		return -1;
	}

	/* inform dsp */
	ret = ioctl(dsp2arm_fd, ARM2DSP_IOC_IRQ, 0);
	if (ret == -1)
	{
		printf("Inform DSP failed!\n");
		return -1;
	}

	/* wait dsp interrupt */
	ret = read(dsp2arm_fd, &irqno, 1);
	if (ret <= 0)
	{
		printf("ARM infomed failed!\n");
		return -1;
	}
	printf("\nARM INFORMED\n");
	printf("IRQ number is %d\n", irqno);

	return 0;
}

Yours,

xiaop

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DSP2ARM communication driver can't insmod