arch/sparc/cpu/leon2/cpu_init.c

   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
  17 DECLARE_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
  31 void 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
  60 int 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  */
  72 int cpu_init_r(void)
  73 {
  74         return 0;
  75 }
  76
  77 /* initiate and setup timer0 to configured HZ. Base clock is 1MHz.
  78  */
  79 int 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 }