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/* Initializes CPU and basic hardware such as memory
* controllers, IRQ controller and system timer 0.
*
* (C) Copyright 2007, 2015
* Daniel Hellstrom, Cobham Gaisler, daniel@gaisler.com
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/asi.h>
#include <asm/leon.h>
#include <asm/io.h>
#include <config.h>
DECLARE_GLOBAL_DATA_PTR;
/*
* 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 available
* - no global variables available for writing
* - constants available
*/
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
/* disable timers */
leon2->Timer_Control_1 = leon2->Timer_Control_2 = 0;
}
int arch_cpu_init(void)
{
gd->cpu_clk = CONFIG_SYS_CLK_FREQ;
gd->bus_clk = CONFIG_SYS_CLK_FREQ;
gd->ram_size = CONFIG_SYS_SDRAM_SIZE;
return 0;
}
/*
* initialize higher level parts of CPU
*/
int cpu_init_r(void)
{
return 0;
}
/* initiate and setup timer0 to configured HZ. Base clock is 1MHz.
*/
int timer_init(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;
/* SYS_HZ ticks per second */
leon2->Timer_Counter_1 = 0;
leon2->Timer_Reload_1 = (CONFIG_SYS_TIMER_RATE / CONFIG_SYS_HZ) - 1;
leon2->Timer_Control_1 = LEON2_TIMER_CTRL_EN | LEON2_TIMER_CTRL_RS |
LEON2_TIMER_CTRL_LD;
CONFIG_SYS_TIMER_COUNTER = (void *)&leon2->Timer_Counter_1;
return 0;
}
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