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/* Initializes CPU and basic hardware such as memory
* controllers, IRQ controller and system timer 0.
*
* (C) Copyright 2007
* Daniel Hellstrom, Gaisler Research, daniel@gaisler.com
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
*/
#include <common.h>
#include <asm/asi.h>
#include <asm/leon.h>
#include <config.h>
DECLARE_GLOBAL_DATA_PTR;
/* reset CPU (jump to 0, without reset) */
void start(void);
struct {
gd_t gd_area;
bd_t bd;
} global_data;
/*
* Breath some life into the CPU...
*
* Set up the memory map,
* initialize a bunch of registers.
*
* Run from FLASH/PROM:
* - until memory controller is set up, only registers avaiable
* - no global variables available for writing
* - constants avaiable
*/
void cpu_init_f(void)
{
LEON2_regs *leon2 = (LEON2_regs *) LEON2_PREGS;
/* initialize the IRQMP */
leon2->Interrupt_Force = 0;
leon2->Interrupt_Pending = 0;
leon2->Interrupt_Clear = 0xfffe; /* clear all old pending interrupts */
leon2->Interrupt_Mask = 0xfffe0000; /* mask all IRQs */
/* cache */
/* I/O port setup */
#ifdef LEON2_IO_PORT_DIR
leon2->PIO_Direction = LEON2_IO_PORT_DIR;
#endif
#ifdef LEON2_IO_PORT_DATA
leon2->PIO_Data = LEON2_IO_PORT_DATA;
#endif
#ifdef LEON2_IO_PORT_INT
leon2->PIO_Interrupt = LEON2_IO_PORT_INT;
#else
leon2->PIO_Interrupt = 0;
#endif
}
void cpu_init_f2(void)
{
}
/*
* initialize higher level parts of CPU like time base and timers
*/
int cpu_init_r(void)
{
LEON2_regs *leon2 = (LEON2_regs *) LEON2_PREGS;
/* initialize prescaler common to all timers to 1MHz */
leon2->Scaler_Counter = leon2->Scaler_Reload =
(((CONFIG_SYS_CLK_FREQ / 1000) + 500) / 1000) - 1;
return (0);
}
/* Uses Timer 0 to get accurate
* pauses. Max 2 raised to 32 ticks
*
*/
void cpu_wait_ticks(unsigned long ticks)
{
unsigned long start = get_timer(0);
while (get_timer(start) < ticks) ;
}
/* initiate and setup timer0 interrupt to 1MHz
* Return irq number for timer int or a negative number for
* dealing with self
*/
int timer_interrupt_init_cpu(void)
{
LEON2_regs *leon2 = (LEON2_regs *) LEON2_PREGS;
/* 1ms ticks */
leon2->Timer_Counter_1 = 0;
leon2->Timer_Reload_1 = 999; /* (((1000000 / 100) - 1)) */
leon2->Timer_Control_1 =
(LEON2_TIMER_CTRL_EN | LEON2_TIMER_CTRL_RS | LEON2_TIMER_CTRL_LD);
return LEON2_TIMER1_IRQNO;
}
/*
* This function is intended for SHORT delays only.
*/
unsigned long cpu_usec2ticks(unsigned long usec)
{
/* timer set to 1kHz ==> 1 clk tick = 1 msec */
if (usec < 1000)
return 1;
return (usec / 1000);
}
unsigned long cpu_ticks2usec(unsigned long ticks)
{
/* 1tick = 1usec */
return ticks * 1000;
}
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