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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 <ambapp.h>
#include <grlib/irqmp.h>
#include <grlib/gptimer.h>
#include <debug_uart.h>
#include <config.h>
/* Default Plug&Play I/O area */
#ifndef CONFIG_AMBAPP_IOAREA
#define CONFIG_AMBAPP_IOAREA AMBA_DEFAULT_IOAREA
#endif
#define TIMER_BASE_CLK 1000000
#define US_PER_TICK (1000000 / CONFIG_SYS_HZ)
DECLARE_GLOBAL_DATA_PTR;
ambapp_dev_irqmp *irqmp = NULL;
ambapp_dev_gptimer *gptimer = NULL;
unsigned int gptimer_irq = 0;
/*
* Breath some life into the CPU...
*
* Run from FLASH/PROM:
* - until memory controller is set up, only registers available
* - memory controller has already been setup up, stack can be used
* - no global variables available for writing
* - constants available
*/
void cpu_init_f(void)
{
#ifdef CONFIG_DEBUG_UART
debug_uart_init();
#endif
}
/* Routine called from start.S,
*
* Run from FLASH/PROM:
* - memory controller has already been setup up, stack can be used
* - global variables available for read/writing
* - constants avaiable
*/
void cpu_init_f2(void)
{
/* Initialize the AMBA Plug & Play bus structure, the bus
* structure represents the AMBA bus that the CPU is located at.
*/
ambapp_bus_init(CONFIG_AMBAPP_IOAREA, CONFIG_SYS_CLK_FREQ, &ambapp_plb);
}
/* If cache snooping is available in hardware the result will be set
* to 0x800000, otherwise 0.
*/
static unsigned int snoop_detect(void)
{
unsigned int result;
asm("lda [%%g0] 2, %0" : "=r"(result));
return result & 0x00800000;
}
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;
gd->arch.snooping_available = snoop_detect();
return 0;
}
/*
* initialize higher level parts of CPU like time base and timers
*/
int cpu_init_r(void)
{
ambapp_apbdev apbdev;
int index, cpu;
ambapp_dev_gptimer *timer = NULL;
unsigned int bus_freq;
/*
* Find AMBA APB IRQMP Controller,
*/
if (ambapp_apb_find(&ambapp_plb, VENDOR_GAISLER,
GAISLER_IRQMP, 0, &apbdev) != 1) {
panic("%s: IRQ controller not found\n", __func__);
return -1;
}
irqmp = (ambapp_dev_irqmp *)apbdev.address;
/* initialize the IRQMP */
irqmp->ilevel = 0xf; /* all IRQ off */
irqmp->iforce = 0;
irqmp->ipend = 0;
irqmp->iclear = 0xfffe; /* clear all old pending interrupts */
for (cpu = 0; cpu < 16; cpu++) {
/* mask and clear force for all IRQs on CPU[N] */
irqmp->cpu_mask[cpu] = 0;
irqmp->cpu_force[cpu] = 0;
}
/* timer */
index = 0;
while (ambapp_apb_find(&ambapp_plb, VENDOR_GAISLER, GAISLER_GPTIMER,
index, &apbdev) == 1) {
timer = (ambapp_dev_gptimer *)apbdev.address;
if (gptimer == NULL) {
gptimer = timer;
gptimer_irq = apbdev.irq;
}
/* Different buses may have different frequency, the
* frequency of the bus tell in which frequency the timer
* prescaler operates.
*/
bus_freq = ambapp_bus_freq(&ambapp_plb, apbdev.ahb_bus_index);
/* initialize prescaler common to all timers to 1MHz */
timer->scalar = timer->scalar_reload =
(((bus_freq / 1000) + 500) / 1000) - 1;
index++;
}
if (!gptimer) {
printf("%s: gptimer not found!\n", __func__);
return 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 configured HZ. Base clock is 1MHz.
* Return irq number for timer int or a negative number for
* dealing with self
*/
int timer_interrupt_init_cpu(void)
{
/* SYS_HZ ticks per second */
gptimer->e[0].val = 0;
gptimer->e[0].rld = (TIMER_BASE_CLK / CONFIG_SYS_HZ) - 1;
gptimer->e[0].ctrl =
(GPTIMER_CTRL_EN | GPTIMER_CTRL_RS |
GPTIMER_CTRL_LD | GPTIMER_CTRL_IE);
return gptimer_irq;
}
ulong get_tbclk(void)
{
return TIMER_BASE_CLK;
}
/*
* This function is intended for SHORT delays only.
*/
unsigned long cpu_usec2ticks(unsigned long usec)
{
if (usec < US_PER_TICK)
return 1;
return usec / US_PER_TICK;
}
unsigned long cpu_ticks2usec(unsigned long ticks)
{
return ticks * US_PER_TICK;
}
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