From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from sdcmail02.amcc.com (sdcmail02.amcc.com [198.137.200.73]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (Client CN "Messaging Gateway Appliance Demo Cert", Issuer "Messaging Gateway Appliance Demo Cert" (not verified)) by ozlabs.org (Postfix) with ESMTPS id 13C66DDDB6 for ; Wed, 1 Apr 2009 13:10:26 +1100 (EST) MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C9B26F.02FD9946" Subject: RE: PowerPC 460EX AD7416 Temperature Sensor Date: Tue, 31 Mar 2009 19:10:21 -0700 Message-ID: References: <20090331125028.066613801@denx.de><20090331125451.600446749@denx.de><20090331133953.GB3044@pengutronix.de><49D21EF1.9050200@grandegger.com><20090331135629.GC3044@pengutronix.de> <04bf01c9b262$95478040$0109220a@deltatau.local> From: "Tirumala Reddy Marri" To: "Henry Bausley" , List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , This is a multi-part message in MIME format. ------_=_NextPart_001_01C9B26F.02FD9946 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Did you have dts entries for IIC in device tree ? also did you have I2C = enabled in "make menuconfig"=20 "device drivers -> i2c support --> I2C bus support -> IBM ppc 4xx On = chip I2C support " selected. Then you should i2c see an entry = /proc/devices . Use that major address and create a device node "mknode = /dev/i2c-0 c 89 0" . =20 Write a user level program to access this device. Here is an example = user code. =20 ---------- cat fan.c /* This program is an example of writing and reading an EEPROM device = via SMBus on a GE Fanuc Embedded Systems, Inc. VMIVME-7809 Single Board Computer. To compile this program: gcc -O vmieep.c -o vmieep Before running this program, log in as root, then load the following modules using: /sbin/modprobe i2c-core /sbin/modprobe i2c-dev /sbin/modprobe i2c-i801 Loading the i2c-i801 module will create /dev/i2c-0, with permissions =3D CRW- --- ---. Either run the vmieep program as root, or change the permissions to CRW- RW- RW- as shown: chmod 666 /dev/i2c-0 */ #include #include #include #include #include //#include //#include #include /* The inline smbus function definitions may or may not be in i2c-dev.h, depending on the Linux distribution. Comment or uncomment the = following #include as necessary. */ #include "i2c-dev.h" /* Use the file of lm_sensors */ #define EEPROM_SIZE 256 /* Adjust for actual number of bytes in = EEPROM */ #define EEPROM_SMBUS_ADDR 0x90 /* Do NOT change! */ int gef_eeprom_read(int fd, unsigned char start_offset, unsigned char = *buffer, unsigned short buflen); int gef_eeprom_write(int fd, unsigned char start_offset, unsigned char = *buffer, unsigned short buflen); void gef_msec_delay(unsigned int msecs); int main(int argc, char *argv[]) { int fd; /* File descriptor initialized with open() */ int adapter_num =3D 0; int status; char filename[20]; /* Name of special device file */ int i2c_addr =3D EEPROM_SMBUS_ADDR; /* SMBus address of EEPROM */ unsigned short offset; /* Which byte to access in the EEPROM */ unsigned char rbuffer; /* Data read from EEPROM */ if ((argc < 3) || (argc > 4)) { printf("Usage: fan read or fan write \n"); return 0; } /* Open the special device file for the SMBus */ sprintf(filename, "/dev/i2c-%d", adapter_num); fd =3D open(filename, O_RDWR); if (fd < 0) { printf("ERROR: open(%s) failed\n", filename); printf("errno =3D %d, %s\n", errno, strerror(errno)); return -1; } //printf("SUCCESS: open(%s) passed\n", filename); /* Specify the EEPROM as the device we want to access. *** IMPORTANT *** The address is actually in the 7 LSBs, so shift i2c_addr one bit to the right.*/ status =3D ioctl(fd, I2C_SLAVE, i2c_addr>>1); if (status < 0) { printf("ERROR: ioctl(fd, I2C_SLAVE, 0x%02X) failed\n", = i2c_addr); printf("errno =3D %d, %s\n", errno, strerror(errno)); close(fd); return -1; } //printf("SUCCESS: ioctl(fd, I2C_SLAVE, 0x%02X>>1) passed\n", = i2c_addr); if (strcmp(argv[1],"read") =3D=3D 0) { offset =3D atoi(argv[2]); gef_eeprom_read(fd, offset, &rbuffer, 1); printf("Offset: %d Data: %d\n", offset, rbuffer); } if (strcmp(argv[1],"write") =3D=3D 0) { offset =3D (unsigned char)(atoi(argv[2])); rbuffer =3D(unsigned char)(atoi(argv[3])); gef_eeprom_write(fd, offset, &rbuffer, 1); printf("Offset: %d Data: %d\n", offset, rbuffer); } /* Close the special device file */ close(fd); return 0; } /////////////////////////////////////////////////////////////////////////= ///// // // Function name : gef_eeprom_read // // Description : Read buflen bytes from the EEPROM beginning at = start_offset // // Return type : 0 for success, -1 for failure // // Argument : int fd : File descriptor returned by open() // Argument : unsigned char start_offset : Read bytes starting at = this // offset in the EEPROM. The sum of buflen and // start_offset must not exceed the maximum size in = bytes // of the EEPROM // Argument : unsigned char *buffer : Where to store the bytes read // from the EEPROM. The buffer must be large enough // to store buflen bytes read from the EEPROM. // Argument : unsigned short buflen : The size in bytes of buffer, = or // how many bytes to read from the EEPROM. The sum = of // buflen and start_offset must not exceed the = maximum // size in bytes of the EEPROM. // int gef_eeprom_read(int fd, unsigned char start_offset, unsigned char = *buffer, unsigned short buflen) { int offset, index; int data; for (index=3D0, offset=3Dstart_offset; index CR: 88000444 XER: 00000000 DEAR: 00000000, ESR: 00000000 TASK =3D ef8590c0[2611] 'cat' THREAD: ef106000 GPR00: 00000000 ef107e40 ef8590c0 00000000 ef107e9c 00000000 00000c00 ef107e98 GPR08: 00000000 c0330000 ffffffff c0330000 48000448 1001cb7c 100042bc 100df49c GPR16: 00000002 00000400 c032f014 c032efe4 ef107e9c ef107e98 bfffffff efb43a00 GPR24: ef61d000 00000000 ef107f20 ef107e98 00000c00 c0400000 00001000 efb43a00 NIP [c02cbe28] mutex_lock+0x0/0x1c LR [c023cec8] ad7416_read_temp+0x24/0x80 Call Trace: [ef107e40] [00000400] 0x400 (unreliable) [ef107e70] [c023d334] i2c_ad7416_read_proc+0x20/0x70 [ef107e90] [c00e8018] proc_file_read+0x108/0x334 [ef107ee0] [c00e2d3c] proc_reg_read+0x4c/0x70 [ef107ef0] [c00a54e8] vfs_read+0xb4/0x16c [ef107f10] [c00a58e0] sys_read+0x4c/0x90 [ef107f40] [c000ea88] ret_from_syscall+0x0/0x3c Instruction dump: 90010014 38000001 90030000 85230004 7f891800 419e000c 80690008 4bd50779 80010014 38210010 7c0803a6 4e800020 <7c001828> 3000ffff 7c00192d = 40a2fff4 ---[ end trace 774db769c3754abe ]--- ********************************************************** Outbound scan for Spam or Virus by Barracuda at Delta Tau ********************************************************** _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev ------_=_NextPart_001_01C9B26F.02FD9946 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable PowerPC 460EX AD7416 Temperature = Sensor=0A= =0A= =0A= =0A=
=0A=
Did you have = dts entries for IIC in device tree ? also did you have I2C enabled in = "make menuconfig"
=0A=
"device drivers -> i2c = support -->  I2C bus support -> IBM ppc 4xx On chip I2C = support " selected. Then you should i2c see an entry /proc/devices . Use = that major address and create a device node "mknode /dev/i2c-0 c 89 0" = .
=0A=
 
=0A=
Write a user level program to = access this device. Here is an example user code.
=0A=
 
=0A=
----------
=0A=
cat fan.c
/*  This program is an example of = writing and reading an EEPROM device via
    SMBus on = a GE Fanuc Embedded Systems, Inc. VMIVME-7809 Single = Board
    Computer.
=0A=
    To compile this program:
=0A=
        gcc -O = vmieep.c -o vmieep
=0A=

    Before running this program, log = in as root, then load the following
    modules = using:
=0A=
       /sbin/modprobe = i2c-core
       /sbin/modprobe = i2c-dev
       /sbin/modprobe = i2c-i801
=0A=
   Loading the i2c-i801 module will create = /dev/i2c-0, with
   permissions =3D CRW- --- ---.  = Either run the vmieep program as root,
   or change the = permissions to CRW- RW- RW- as shown:
=0A=
       chmod 666 = /dev/i2c-0
=0A=
*/
=0A=

#include <stdio.h>
#include = <string.h>
#include <stdlib.h>
#include = <errno.h>
#include <fcntl.h>
//#include = <linux/i2c.h>
//#include <linux/i2c-dev.h>
#include = <sys/time.h>
=0A=

/* The inline smbus function definitions may or may = not be in i2c-dev.h,
   depending on the Linux = distribution.  Comment or uncomment the following
   = #include as necessary. */
#include "i2c-dev.h" /*  Use the file = of lm_sensors  */
=0A=

#define EEPROM_SIZE   256    = /* Adjust for actual number of bytes in EEPROM */
#define = EEPROM_SMBUS_ADDR  0x90 /* Do NOT change! */
=0A=
int gef_eeprom_read(int fd, unsigned char start_offset, = unsigned char = *buffer,
          &= nbsp;         unsigned short = buflen);
int gef_eeprom_write(int fd, unsigned char start_offset, = unsigned char = *buffer,
          &= nbsp;         unsigned short = buflen);
void gef_msec_delay(unsigned int msecs);
=0A=

int main(int argc, char = *argv[])
{
    int fd;   /* File = descriptor initialized with open() */
    int = adapter_num =3D 0;
    int = status;
    char filename[20];  /* Name of = special device file */
    int i2c_addr =3D = EEPROM_SMBUS_ADDR; /* SMBus address of EEPROM */
    = unsigned short offset; /* Which byte to access in the EEPROM = */
    unsigned char rbuffer; /* Data read from EEPROM = */
=0A=
    if ((argc < 3) || (argc > = 4))
    = {
        printf("Usage: fan read = <addr> or fan write <addr> = <data>\n");
        return = 0;
    }
    /* Open the special = device file for the SMBus */
    sprintf(filename, = "/dev/i2c-%d", adapter_num);
    fd =3D open(filename, = O_RDWR);
    if (fd < 0)
    = {
        printf("ERROR: open(%s) = failed\n", filename);
        = printf("errno =3D %d, %s\n", errno, = strerror(errno));
        return = -1;
    }
    //printf("SUCCESS: = open(%s) passed\n", filename);
=0A=

    /* Specify the EEPROM as the = device we want to access.
       *** = IMPORTANT ***
       The address is = actually in the 7 LSBs, so shift
       = i2c_addr one bit to the right.*/
    status =3D = ioctl(fd, I2C_SLAVE, i2c_addr>>1);
    if = (status < 0)
    = {
        printf("ERROR: ioctl(fd, = I2C_SLAVE, 0x%02X) failed\n", = i2c_addr);
        printf("errno = =3D %d, %s\n", errno, = strerror(errno));
        = close(fd);
        return = -1;
    }
    //printf("SUCCESS: = ioctl(fd, I2C_SLAVE, 0x%02X>>1) passed\n", i2c_addr);
=0A=

    if (strcmp(argv[1],"read") =3D=3D = 0)
    {
        = offset =3D atoi(argv[2]);
        = gef_eeprom_read(fd, offset, &rbuffer, = 1);
        printf("Offset: = %d   Data: %d\n", offset, rbuffer);
    = }
=0A=

    if (strcmp(argv[1],"write") =3D=3D = 0)
    {
        = offset =3D (unsigned = char)(atoi(argv[2]));
        = rbuffer =3D(unsigned = char)(atoi(argv[3]));
        = gef_eeprom_write(fd, offset, &rbuffer, = 1);
        printf("Offset: = %d   Data: %d\n", offset, rbuffer);
    = }
=0A=

    /* Close the special device file = */
    close(fd);
=0A=
    return 0;
}
=0A=

///////////////////////////////////////////////////////////= ///////////////////
//
// Function name : = gef_eeprom_read
//
// Description   : Read buflen bytes = from the EEPROM beginning at start_offset
//
// Return = type   : 0 for success, -1 for failure
//
// = Argument      : int fd : File descriptor = returned by open()
// Argument      : = unsigned char start_offset : Read bytes starting at = this
//          &nb= sp;          offset in the = EEPROM.  The sum of buflen = and
//          &nbs= p;          start_offset = must not exceed the maximum size in = bytes
//          &n= bsp;          of the = EEPROM
// Argument      : unsigned char = *buffer : Where to store the bytes = read
//          &nb= sp;          from the = EEPROM.  The buffer must be large = enough
//          &= nbsp;          to store = buflen bytes read from the EEPROM.
// = Argument      : unsigned short buflen : The = size in bytes of buffer, = or
//           = ;          how many bytes = to read from the EEPROM.  The sum = of
//           = ;          buflen and = start_offset must not exceed the = maximum
//          =            size in = bytes of the EEPROM.
//
=0A=
int gef_eeprom_read(int fd, unsigned char start_offset, = unsigned char = *buffer,
          &= nbsp;         unsigned short = buflen)
{
    int offset, = index;
    int data;
=0A=
    for (index=3D0, offset=3Dstart_offset; = index<buflen &&
        = offset<EEPROM_SIZE; index++, offset++)
    = {
        data =3D = i2c_smbus_read_byte_data(fd, = offset);
        if (data =3D=3D = -1)
        = {
            = printf("ERROR: i2c_smbus_read_byte_data(fd, 0x%02X) = failed\n",
          = ;      = offset);
          &= nbsp; printf("errno =3D %d, %s\n", errno, = strerror(errno));
        &nbs= p;   return -1;
        = }
        buffer[index] =3D = (unsigned char) (data);
    }
=0A=
    return 0;
}
=0A=

///////////////////////////////////////////////////////////= ///////////////////
//
// Function name : = gef_eeprom_write
//
// Description   : Write buflen = bytes to the EEPROM beginning at start_offset
//
// Return = type   : 0 for success, -1 for failure
//
// = Argument      : int fd : File descriptor = returned by open()
// Argument      : = unsigned char start_offset : Write bytes starting at = this
//          &nb= sp;          offset in the = EEPROM.  The sum of buflen = and
//          &nbs= p;          start_offset = must not exceed the maximum size in = bytes
//          &n= bsp;          of the = EEPROM
// Argument      : unsigned char = *buffer : Where to get the bytes to = write
//          &n= bsp;          to the = EEPROM.
// Argument      : unsigned short = buflen : The size in bytes of = buffer.
//          =            The sum of = buflen and start_offset must not exceed = the
//          &nbs= p;          maximum size in = bytes of the EEPROM.
//
=0A=
int gef_eeprom_write(int fd, unsigned char start_offset, = unsigned char = *buffer,
          &= nbsp;         unsigned short = buflen)
{
    int offset, = index;
    int status;
=0A=
    for (index=3D0, offset=3Dstart_offset; = index<buflen &&
        = offset<EEPROM_SIZE; index++, offset++)
    = {
        status =3D = i2c_smbus_write_byte_data(fd, offset, = buffer[index]);
        if (status = < 0)
        = {
            = printf("ERROR: i2c_smbus_write_byte_data(fd, 0x%02X, 0x%02X) = failed\n",
          = ;      offset, = buffer[index]);
         =    printf("errno =3D %d, %s\n", errno, = strerror(errno));
        &nbs= p;   return -1;
        = }
=0A=
        /* Delay while = the byte write completes = */
        = gef_msec_delay(10);
    }
=0A=
    return 0;
}
=0A=

///////////////////////////////////////////////////////////= ///////////////////
//
// Function name : = gef_msec_delay
//
// Description   : Delay for a number = of milliseconds before returning
//
// Return type   : = void
//
// Argument      : unsigned int = msecs : The number of milliseconds to delay
//
=0A=
void gef_msec_delay(unsigned int = msecs)
{
    struct timeval s_current, = s_start;
    struct timezone tz;
    = unsigned int current, start;
=0A=

    /* Get initial time = */
    gettimeofday(&s_start, = &tz);
    start =3D s_start.tv_sec*1000000 + = s_start.tv_usec;
=0A=
    /* Loop until msecs time have elapsed = */
    do
    = {
        = gettimeofday(&s_current, = &tz);
        current =3D = s_current.tv_sec*1000000 + s_current.tv_usec;
    } = while ((current-start) < (msecs*1000));
}
=0A=

-------------
=0A=

=0A=
=0A= From: = linuxppc-dev-bounces+tmarri=3Damcc.com@ozlabs.org on behalf of Henry = Bausley
Sent: Tue 3/31/2009 5:41 PM
To: = linuxppc-dev@ozlabs.org
Subject: PowerPC 460EX AD7416 = Temperature Sensor

=0A=
=0A=

Does anyone know if the I2C temperature sensor is = functioning on the AMCC
460EX?
When I do a cat /proc/ad7416 I get = the following crash.

Unable to handle kernel paging request for = data at address 0x00000000
Faulting instruction address: = 0xc02cbe28
Oops: Kernel access of bad area, sig: 11 [#1]
PowerPC = 44x Platform
NIP: c02cbe28 LR: c023cec8 CTR: c023d314
REGS: = ef107d90 TRAP: 0300   Not tainted  (2.6.28.7)
MSR: = 00029000 <EE,ME>  CR: 88000444  XER: 00000000
DEAR: = 00000000, ESR: 00000000
TASK =3D ef8590c0[2611] 'cat' THREAD: = ef106000
GPR00: 00000000 ef107e40 ef8590c0 00000000 ef107e9c 00000000 = 00000c00
ef107e98
GPR08: 00000000 c0330000 ffffffff c0330000 = 48000448 1001cb7c 100042bc
100df49c
GPR16: 00000002 00000400 = c032f014 c032efe4 ef107e9c ef107e98 bfffffff
efb43a00
GPR24: = ef61d000 00000000 ef107f20 ef107e98 00000c00 c0400000 = 00001000
efb43a00
NIP [c02cbe28] mutex_lock+0x0/0x1c
LR = [c023cec8] ad7416_read_temp+0x24/0x80
Call Trace:
[ef107e40] = [00000400] 0x400 (unreliable)
[ef107e70] [c023d334] = i2c_ad7416_read_proc+0x20/0x70
[ef107e90] [c00e8018] = proc_file_read+0x108/0x334
[ef107ee0] [c00e2d3c] = proc_reg_read+0x4c/0x70
[ef107ef0] [c00a54e8] = vfs_read+0xb4/0x16c
[ef107f10] [c00a58e0] = sys_read+0x4c/0x90
[ef107f40] [c000ea88] = ret_from_syscall+0x0/0x3c
Instruction dump:
90010014 38000001 = 90030000 85230004 7f891800 419e000c 80690008 4bd50779
80010014 = 38210010 7c0803a6 4e800020 <7c001828> 3000ffff 7c00192d = 40a2fff4
---[ end trace 774db769c3754abe = ]---



*****************************************************= *****
Outbound scan for Spam or Virus by Barracuda at Delta = Tau
**********************************************************
____= ___________________________________________
Linuxppc-dev mailing = list
Linuxppc-dev@ozlabs.org
https://ozlabs.= org/mailman/listinfo/linuxppc-dev

------_=_NextPart_001_01C9B26F.02FD9946--