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/**
* @file
*
* @ingroup tqm8xx
*
* @brief Source for BSP startup code.
*/
/*
* Copyright (c) 2008
* Embedded Brains GmbH
* Obere Lagerstr. 30
* D-82178 Puchheim
* Germany
* rtems@embedded-brains.de
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#include <stdlib.h>
#include <rtems.h>
#include <rtems/counter.h>
#include <libcpu/powerpc-utility.h>
#include <bsp.h>
#include <bsp/vectors.h>
#include <bsp/bootcard.h>
#include <bsp/irq-generic.h>
#ifdef BSP_HAS_TQMMON
/*
* FIXME: TQ Monitor structure
*/
#endif /* BSP_HAS_TQMMON */
/* Configuration parameters for console driver, ... */
uint32_t BSP_bus_frequency;
/* Configuration parameter for clock driver */
uint32_t bsp_time_base_frequency;
/* Legacy */
uint32_t bsp_clicks_per_usec; /* for PIT driver: OSCCLK */
static const char *bsp_tqm_get_cib_string( const char *cib_id)
{
char srch_pattern[10] = "";
char *fnd_str;
/*
* create search pattern
*/
strcat(srch_pattern,"-");
strncat(srch_pattern,
cib_id,
sizeof(srch_pattern)-1-strlen(srch_pattern));
strncat(srch_pattern,
" ",
sizeof(srch_pattern)-1-strlen(srch_pattern));
/*
* search for pattern in info block (CIB)
*/
fnd_str = strstr((const char *)TQM_CONF_INFO_BLOCK_ADDR,srch_pattern);
if (fnd_str == NULL) {
return NULL;
}
else {
/*
* found? then advance behind search pattern
*/
return fnd_str + strlen(srch_pattern);
}
}
static rtems_status_code bsp_tqm_get_cib_uint32( const char *cib_id,
uint32_t *result)
{
const char *item_ptr;
char *end_ptr;
item_ptr = bsp_tqm_get_cib_string(cib_id);
if (item_ptr == NULL) {
return RTEMS_INVALID_ID;
}
/*
* convert string to uint32
*/
*result = strtoul(item_ptr,&end_ptr,10);
return RTEMS_SUCCESSFUL;
}
uint32_t _CPU_Counter_frequency(void)
{
return bsp_time_base_frequency;
}
void bsp_start( void)
{
uintptr_t interrupt_stack_start = (uintptr_t) bsp_interrupt_stack_start;
uintptr_t interrupt_stack_size = (uintptr_t) bsp_interrupt_stack_end
- interrupt_stack_start;
/*
* Get CPU identification dynamically. Note that the get_ppc_cpu_type()
* function stores the result in global variables so that it can be used
* later...
*/
get_ppc_cpu_type();
get_ppc_cpu_revision();
/* Basic CPU initialization */
cpu_init();
/*
* Enable instruction and data caches. Do not force writethrough mode.
*/
#if BSP_INSTRUCTION_CACHE_ENABLED
rtems_cache_enable_instruction();
#endif
#if BSP_DATA_CACHE_ENABLED
rtems_cache_enable_data();
#endif
/*
* This is evaluated during runtime, so it should be ok to set it
* before we initialize the drivers.
*/
/* Initialize some device driver parameters */
/*
* get the (internal) bus frequency
* NOTE: the external bus may be clocked at a lower speed
* but this does not concern the internal units like PIT,
* DEC, baudrate generator etc)
*/
if (RTEMS_SUCCESSFUL !=
bsp_tqm_get_cib_uint32("cu",
&BSP_bus_frequency)) {
rtems_panic("Cannot determine BUS frequency\n");
}
bsp_time_base_frequency = BSP_bus_frequency / 16;
bsp_clicks_per_usec = bsp_time_base_frequency / 1000000;
/* Initialize exception handler */
ppc_exc_initialize(interrupt_stack_start, interrupt_stack_size);
/* Initalize interrupt support */
bsp_interrupt_initialize();
#ifdef SHOW_MORE_INIT_SETTINGS
printk("Exit from bspstart\n");
#endif
}
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