diff options
Diffstat (limited to 'c/src/lib/libbsp/powerpc/mvme3100/i2c/i2c_init.c')
| -rw-r--r-- | c/src/lib/libbsp/powerpc/mvme3100/i2c/i2c_init.c | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/powerpc/mvme3100/i2c/i2c_init.c b/c/src/lib/libbsp/powerpc/mvme3100/i2c/i2c_init.c new file mode 100644 index 0000000000..61eae8b1b7 --- /dev/null +++ b/c/src/lib/libbsp/powerpc/mvme3100/i2c/i2c_init.c @@ -0,0 +1,187 @@ +/* $Id$ */ + +/* Register i2c bus driver & devices */ + +/* + * Authorship + * ---------- + * This software ('mvme3100' RTEMS BSP) was created by + * + * Till Straumann <strauman@slac.stanford.edu>, 2005-2007, + * Stanford Linear Accelerator Center, Stanford University. + * + * Acknowledgement of sponsorship + * ------------------------------ + * The 'mvme3100' BSP was produced by + * the Stanford Linear Accelerator Center, Stanford University, + * under Contract DE-AC03-76SFO0515 with the Department of Energy. + * + * Government disclaimer of liability + * ---------------------------------- + * Neither the United States nor the United States Department of Energy, + * nor any of their employees, makes any warranty, express or implied, or + * assumes any legal liability or responsibility for the accuracy, + * completeness, or usefulness of any data, apparatus, product, or process + * disclosed, or represents that its use would not infringe privately owned + * rights. + * + * Stanford disclaimer of liability + * -------------------------------- + * Stanford University makes no representations or warranties, express or + * implied, nor assumes any liability for the use of this software. + * + * Stanford disclaimer of copyright + * -------------------------------- + * Stanford University, owner of the copyright, hereby disclaims its + * copyright and all other rights in this software. Hence, anyone may + * freely use it for any purpose without restriction. + * + * Maintenance of notices + * ---------------------- + * In the interest of clarity regarding the origin and status of this + * SLAC software, this and all the preceding Stanford University notices + * are to remain affixed to any copy or derivative of this software made + * or distributed by the recipient and are to be affixed to any copy of + * software made or distributed by the recipient that contains a copy or + * derivative of this software. + * + * ------------------ SLAC Software Notices, Set 4 OTT.002a, 2004 FEB 03 + */ + +#include <rtems.h> +#include <bsp.h> +#include <rtems/bspIo.h> +#include <rtems/libi2c.h> +#include <libchip/i2c-2b-eeprom.h> +#include <libchip/i2c-ds1621.h> +#include <bsp/mpc8540_i2c_busdrv.h> +#include <rtems/libio.h> + +#include <stdio.h> +#include <sys/stat.h> +#include <sys/errno.h> +#include <stdarg.h> + +static void +safe_printf (const char *fmt, ...) +{ + va_list ap; + + va_start(ap, fmt); + if ( _System_state_Is_up( _System_state_Get() ) ) + vfprintf( stderr, fmt, ap ); + else + vprintk( fmt, ap ); + va_end(ap); +} + +static void +safe_perror(const char *s) +{ + safe_printf("%s :%s\n", s, strerror(errno)); +} + + +int +BSP_i2c_initialize() +{ +int busno, succ = 0; + + /* Initialize the library */ + if ( rtems_libi2c_initialize() ) { + safe_printf("Initializing I2C library failed\n"); + return -1; + } + + /* Register our bus driver */ + if ( (busno=rtems_libi2c_register_bus( + BSP_I2C_BUS0_NAME, + BSP_I2C_BUS_DESCRIPTOR) ) < 0 ) { + safe_perror("Registering mpc8540 i2c bus driver"); + return -1; + } + + /* Now register higher level drivers; note that + * the i2c address in the manual is actually left-shifted + * by one bit, i.e., as it would go on the bus. + */ + + /* Use read-only driver for VPD */ + if ( rtems_libi2c_register_drv( + BSP_I2C_VPD_EEPROM_NAME, + i2c_2b_eeprom_ro_driver_descriptor, + busno, + BSP_VPD_I2C_ADDR) < 0 ) { + safe_perror("Registering i2c VPD eeprom driver failed"); + } else { + succ++; + } + + /* Use read-write driver for user eeprom -- you still might + * have to disable HW write-protection on your board. + */ + if ( rtems_libi2c_register_drv( + BSP_I2C_USR_EEPROM_NAME, + i2c_2b_eeprom_driver_descriptor, + busno, + BSP_USR0_I2C_ADDR) < 0 ) { + safe_perror("Registering i2c 1st USR eeprom driver failed"); + } else { + succ++; + } + + /* Use read-write driver for user eeprom -- you still might + * have to disable HW write-protection on your board. + */ + if ( rtems_libi2c_register_drv( + BSP_I2C_USR1_EEPROM_NAME, + i2c_2b_eeprom_driver_descriptor, + busno, + BSP_USR1_I2C_ADDR) < 0 ) { + safe_perror("Registering i2c 2nd USR eeprom driver failed"); + } else { + succ++; + } + + /* The thermostat */ + if ( rtems_libi2c_register_drv( + BSP_I2C_DS1621_NAME, + i2c_ds1621_driver_descriptor, + busno, + BSP_THM_I2C_ADDR) < 0 ) { + safe_perror("Registering i2c ds1621 temp sensor. driver failed"); + } else { + succ++; + } + + /* Finally, as an example, register raw access to the + * ds1621. The driver above just reads the 8 msb of the + * temperature but doesn't support anything else. Using + * the raw device node you can write/read individual + * control bytes yourself and e.g., program the thermostat... + */ + + if ( mknod( + BSP_I2C_DS1621_RAW_DEV_NAME, + 0666 | S_IFCHR, + rtems_filesystem_make_dev_t(rtems_libi2c_major, + RTEMS_LIBI2C_MAKE_MINOR(busno,BSP_THM_I2C_ADDR))) ) { + safe_perror("Creating device node for raw ds1621 (temp. sensor) access failed"); + } else { + succ++; + } + + /* Raw access to RTC */ + if ( mknod( + BSP_I2C_DS1375_RAW_DEV_NAME, + 0666 | S_IFCHR, + rtems_filesystem_make_dev_t(rtems_libi2c_major, + RTEMS_LIBI2C_MAKE_MINOR(busno,BSP_RTC_I2C_ADDR))) ) { + safe_perror("Creating device node for raw ds1375 (rtc) access failed"); + } else { + succ++; + } + + safe_printf("%i I2C devices registered\n", succ); + return 0; +} |