/*
* This routine does the bulk of the system initialization.
*/
/*
* Author: Thomas Doerfler <td@imd.m.isar.de>
* IMD Ingenieurbuero fuer Microcomputertechnik
*
* COPYRIGHT (c) 1998 by IMD
*
* Changes from IMD are covered by the original distributions terms.
* This file has been derived from the papyrus BSP:
*
* Author: Andrew Bray <andy@i-cubed.co.uk>
*
* COPYRIGHT (c) 1995 by i-cubed ltd.
*
* To anyone who acknowledges that this file is provided "AS IS"
* without any express or implied warranty:
* permission to use, copy, modify, and distribute this file
* for any purpose is hereby granted without fee, provided that
* the above copyright notice and this notice appears in all
* copies, and that the name of i-cubed limited not be used in
* advertising or publicity pertaining to distribution of the
* software without specific, written prior permission.
* i-cubed limited makes no representations about the suitability
* of this software for any purpose.
*
* Modifications for spooling console driver and control of memory layout
* with linker command file by
* Thomas Doerfler <td@imd.m.isar.de>
* for these modifications:
* COPYRIGHT (c) 1997 by IMD, Puchheim, Germany.
*
* To anyone who acknowledges that this file is provided "AS IS"
* without any express or implied warranty:
* permission to use, copy, modify, and distribute this file
* for any purpose is hereby granted without fee, provided that
* the above copyright notice and this notice appears in all
* copies. IMD makes no representations about the suitability
* of this software for any purpose.
*
* Derived from c/src/lib/libbsp/no_cpu/no_bsp/startup/bspstart.c:
*
* COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994.
* On-Line Applications Research Corporation (OAR).
*
* Modifications for PPC405GP by Dennis Ehlin
*
* Further modified for the PPC405EX Haleakala board by
* Michael Hamel ADInstruments Ltd May 2008
*/
#include <string.h>
#include <fcntl.h>
#include <rtems/bspIo.h>
#include <rtems/counter.h>
#include <bsp.h>
#include <bsp/bootcard.h>
#include <bsp/uart.h>
#include <bsp/irq.h>
#include <libcpu/powerpc-utility.h>
#include <bsp/vectors.h>
#include <ppc4xx/ppc405gp.h>
#include <ppc4xx/ppc405ex.h>
#include <stdio.h>
/*
* Driver configuration parameters
*/
/* Expected by clock.c */
uint32_t bsp_clicks_per_usec;
/*-------------------- Haleakala-specific UART setup -------------------------*/
static void
EarlyUARTInit(int baudRate)
{
volatile uint8_t* up = (uint8_t*)(BSP_UART_IOBASE_COM1);
int divider = BSP_UART_BAUD_BASE / baudRate;
up[LCR] = DLAB; /* Access DLM/DLL */
up[DLL] = divider & 0x0FF;
up[DLM] = divider >> 8;
up[LCR] = CHR_8_BITS;
up[MCR] = DTR | RTS;
up[FCR] = FIFO_EN | XMIT_RESET | RCV_RESET;
up[THR] = '+';
}
static void
InitUARTClock(void)
{
uint32_t reg;
mfsdr(SDR0_UART0,reg);
reg &= ~0x008000FF;
reg |= 0x00800001; /* Ext clock, div 1 */
mtsdr(SDR0_UART0,reg);
}
static void GPIO_AlternateSelect(int bitnum, int source)
/* PPC405EX: select a GPIO function for the specified pin */
{
int shift;
unsigned long value, mask;
GPIORegisters* gpioPtr = (GPIORegisters*)(GPIOAddress);
shift = (31 - bitnum) & 0xF;
value = (source & 3) << (shift*2);
mask = 3 << (shift*2);
if (bitnum <= 15) {
gpioPtr->OSRL = (gpioPtr->OSRL & ~mask) | value;
gpioPtr->TSRL = (gpioPtr->TSRL & ~mask) | value;
} else {
gpioPtr->OSRH = (gpioPtr->OSRH & ~mask) | value;
gpioPtr->TSRH = (gpioPtr->TSRH & ~mask) | value;
}
}
static void Init_FPGA(void)
{
/* Have to write to the FPGA to enable the UART drivers */
/* Have to enable CS2 as an output in GPIO to get the FPGA working */
mtebc(EBC0_B2CR,0xF0018000); /* Set up CS2 at 0xF0000000 */
mtebc(EBC0_B2AP,0x9400C800);
GPIO_AlternateSelect(9,1); /* GPIO9 = PerCS2 */
{
unsigned long *fpgaPtr = (unsigned long*)(0xF0000000);
unsigned long n;
n = *(fpgaPtr);
n &= ~0x00100; /* User LEDs on */
n |= 0x30000; /* UART 0 and 1 transcievers on! */
*fpgaPtr = n;
}
}
/*===================================================================*/
static void
DirectUARTWrite(const char c)
{
volatile uint8_t* up = (uint8_t*)(BSP_UART_IOBASE_COM1);
while ((up[LSR] & THRE) == 0) { ; }
up[THR] = c;
}
/* We will provide our own printk output function as it may get used early */
BSP_output_char_function_type BSP_output_char = DirectUARTWrite;
BSP_polling_getchar_function_type BSP_poll_char = NULL;
uint32_t _CPU_Counter_frequency(void)
{
return bsp_clicks_per_usec * 1000000;
}
/*===================================================================*/
void bsp_start( void )
{
/* Get the UART clock initialized first in case we call printk */
InitUARTClock();
Init_FPGA();
EarlyUARTInit(115200);
/*
* Get CPU identification dynamically. Note that the get_ppc_cpu_type()
* function store the result in global variables
* so that it can be used later...
*/
get_ppc_cpu_type();
get_ppc_cpu_revision();
/*
* initialize the device driver parameters
*/
/* Set globals visible to clock.c */
/* timebase register ticks/microsecond = CPU Clk in MHz */
bsp_clicks_per_usec = 400;
/*
* Initialize default raw exception handlers.
*/
ppc_exc_initialize(
(uintptr_t) _Configuration_Interrupt_stack_area_begin,
rtems_configuration_get_interrupt_stack_size()
);
/*
* Install our own set of exception vectors
*/
BSP_rtems_irq_mng_init(0);
}
