LXR uboot/arch/sparc/cpu/leon2/cpu

   1/* Initializes CPU and basic hardware such as memory
   2 * controllers, IRQ controller and system timer 0.
   3 *
   4 * (C) Copyright 2007, 2015
   5 * Daniel Hellstrom, Cobham Gaisler, daniel@gaisler.com
   6 *
   7 * SPDX-License-Identifier:     GPL-2.0+
   8 */
   9
  10#include <common.h>
  11#include <asm/asi.h>
  12#include <asm/leon.h>
  13#include <asm/io.h>
  14
  15#include <config.h>
  16
  17DECLARE_GLOBAL_DATA_PTR;
  18
  19/*
  20 * Breath some life into the CPU...
  21 *
  22 * Set up the memory map,
  23 * initialize a bunch of registers.
  24 *
  25 * Run from FLASH/PROM:
  26 *  - until memory controller is set up, only registers available
  27 *  - no global variables available for writing
  28 *  - constants available
  29 */
  30
  31void cpu_init_f(void)
  32{
  33        LEON2_regs *leon2 = (LEON2_regs *) LEON2_PREGS;
  34
  35        /* initialize the IRQMP */
  36        leon2->Interrupt_Force = 0;
  37        leon2->Interrupt_Pending = 0;
  38        leon2->Interrupt_Clear = 0xfffe;        /* clear all old pending interrupts */
  39        leon2->Interrupt_Mask = 0xfffe0000;     /* mask all IRQs */
  40
  41        /* cache */
  42
  43        /* I/O port setup */
  44#ifdef LEON2_IO_PORT_DIR
  45        leon2->PIO_Direction = LEON2_IO_PORT_DIR;
  46#endif
  47#ifdef LEON2_IO_PORT_DATA
  48        leon2->PIO_Data = LEON2_IO_PORT_DATA;
  49#endif
  50#ifdef LEON2_IO_PORT_INT
  51        leon2->PIO_Interrupt = LEON2_IO_PORT_INT;
  52#else
  53        leon2->PIO_Interrupt = 0;
  54#endif
  55
  56        /* disable timers */
  57        leon2->Timer_Control_1 = leon2->Timer_Control_2 = 0;
  58}
  59
  60int arch_cpu_init(void)
  61{
  62        gd->cpu_clk = CONFIG_SYS_CLK_FREQ;
  63        gd->bus_clk = CONFIG_SYS_CLK_FREQ;
  64        gd->ram_size = CONFIG_SYS_SDRAM_SIZE;
  65
  66        return 0;
  67}
  68
  69/*
  70 * initialize higher level parts of CPU
  71 */
  72int cpu_init_r(void)
  73{
  74        return 0;
  75}
  76
  77/* initiate and setup timer0 to configured HZ. Base clock is 1MHz.
  78 */
  79int timer_init(void)
  80{
  81        LEON2_regs *leon2 = (LEON2_regs *)LEON2_PREGS;
  82
  83        /* initialize prescaler common to all timers to 1MHz */
  84        leon2->Scaler_Counter = leon2->Scaler_Reload =
  85                (((CONFIG_SYS_CLK_FREQ / 1000) + 500) / 1000) - 1;
  86
  87        /* SYS_HZ ticks per second */
  88        leon2->Timer_Counter_1 = 0;
  89        leon2->Timer_Reload_1 = (CONFIG_SYS_TIMER_RATE / CONFIG_SYS_HZ) - 1;
  90        leon2->Timer_Control_1 = LEON2_TIMER_CTRL_EN | LEON2_TIMER_CTRL_RS |
  91                LEON2_TIMER_CTRL_LD;
  92
  93        CONFIG_SYS_TIMER_COUNTER = (void *)&leon2->Timer_Counter_1;
  94        return 0;
  95}
  96