/* 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; }