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/**
* @file
*
* @ingroup mpc83xx
*
* @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.com/license/LICENSE.
*/
#include <rtems/counter.h>
#include <libchip/serial.h>
#include <libcpu/powerpc-utility.h>
#include <bsp.h>
#include <bsp/vectors.h>
#include <bsp/bootcard.h>
#include <bsp/irq-generic.h>
#include <bsp/linker-symbols.h>
#include <bsp/u-boot.h>
/* Configuration parameters for console driver, ... */
unsigned int BSP_bus_frequency;
/* Configuration parameter for clock driver */
uint32_t bsp_time_base_frequency;
/* Legacy */
uint32_t bsp_clicks_per_usec;
/* Default decrementer exception handler */
static int mpc83xx_decrementer_exception_handler( BSP_Exception_frame *frame, unsigned number)
{
ppc_set_decrementer_register(UINT32_MAX);
return 0;
}
void BSP_panic(char *s)
{
rtems_interrupt_level level;
rtems_interrupt_disable(level);
printk("%s PANIC %s\n", rtems_get_version_string(), s);
while (1) {
/* Do nothing */
}
}
void _BSP_Fatal_error(unsigned n)
{
rtems_interrupt_level level;
rtems_interrupt_disable( level);
printk( "%s PANIC ERROR %u\n", rtems_get_version_string(), n);
while (1) {
/* Do nothing */
}
}
void bsp_start( void)
{
rtems_status_code sc = RTEMS_SUCCESSFUL;
unsigned long i = 0;
ppc_cpu_id_t myCpu;
ppc_cpu_revision_t myCpuRevision;
/*
* Get CPU identification dynamically. Note that the get_ppc_cpu_type() function
* store the result in global variables so that it can be used latter...
*/
myCpu = get_ppc_cpu_type();
myCpuRevision = get_ppc_cpu_revision();
/* Basic CPU initialization */
cpu_init();
/*
* Enable instruction and data caches. Do not force writethrough mode.
*/
#ifdef BSP_INSTRUCTION_CACHE_ENABLED
rtems_cache_enable_instruction();
#endif
#ifdef 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 */
#ifdef HAS_UBOOT
BSP_bus_frequency = bsp_uboot_board_info.bi_busfreq;
#else /* HAS_UBOOT */
BSP_bus_frequency = BSP_CLKIN_FRQ * BSP_SYSPLL_MF / BSP_SYSPLL_CKID;
#endif /* HAS_UBOOT */
bsp_time_base_frequency = BSP_bus_frequency / 4;
bsp_clicks_per_usec = bsp_time_base_frequency / 1000000;
rtems_counter_initialize_converter(bsp_time_base_frequency);
/* Initialize some console parameters */
for (i = 0; i < Console_Configuration_Count; ++i) {
Console_Configuration_Ports [i].ulClock = BSP_bus_frequency;
#ifdef HAS_UBOOT
Console_Configuration_Ports [i].pDeviceParams =
(void *) bsp_uboot_board_info.bi_baudrate;
#endif
}
/* Initialize exception handler */
#ifndef BSP_DATA_CACHE_ENABLED
ppc_exc_cache_wb_check = 0;
#endif
ppc_exc_initialize(
(uintptr_t) bsp_section_work_begin,
rtems_configuration_get_interrupt_stack_size()
);
/* Install default handler for the decrementer exception */
sc = ppc_exc_set_handler( ASM_DEC_VECTOR, mpc83xx_decrementer_exception_handler);
if (sc != RTEMS_SUCCESSFUL) {
BSP_panic("cannot install decrementer exception handler");
}
/* Initalize interrupt support */
bsp_interrupt_initialize();
#ifdef SHOW_MORE_INIT_SETTINGS
printk("Exit from bspstart\n");
#endif
}
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