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/**
* @file
*
* @ingroup mpc83xx
*
* @brief Source for BSP startup code.
*/
/*
* Copyright (c) 2008-2014 embedded brains GmbH. All rights reserved.
*
* 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 <rtems/counter.h>
#include <libchip/ns16550.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>
#include <bsp/console-termios.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;
}
uint32_t _CPU_Counter_frequency(void)
{
return bsp_time_base_frequency;
}
void bsp_start( void)
{
rtems_status_code sc = RTEMS_SUCCESSFUL;
unsigned long i = 0;
/*
* 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...
*/
get_ppc_cpu_type();
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;
/* Initialize some console parameters */
for (i = 0; i < console_device_count; ++i) {
ns16550_context *ctx = (ns16550_context *) console_device_table[i].context;
ctx->clock = BSP_bus_frequency;
#ifdef HAS_UBOOT
ctx->initial_baud = 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();
/* Install default handler for the decrementer exception */
sc = ppc_exc_set_handler( ASM_DEC_VECTOR, mpc83xx_decrementer_exception_handler);
if (sc != RTEMS_SUCCESSFUL) {
rtems_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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