u-boot/arch/microblaze/cpu/timer.c
Michal Simek 35670665d6 microblaze: Do not call timer init that early
Timer needs to be converted to DM but as of now it can't be called so
early because intc controller is not ready. Call it later in board_r.c.
Before this patch timer_init is called twice which is wrong.
The patch is blocking initialization before relocation.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2018-07-19 10:49:54 +02:00

118 lines
2.2 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2007 Michal Simek
*
* Michal SIMEK <monstr@monstr.eu>
*/
#include <common.h>
#include <fdtdec.h>
#include <asm/microblaze_timer.h>
#include <asm/microblaze_intc.h>
DECLARE_GLOBAL_DATA_PTR;
volatile int timestamp = 0;
microblaze_timer_t *tmr;
ulong get_timer (ulong base)
{
if (tmr)
return timestamp - base;
return timestamp++ - base;
}
void __udelay(unsigned long usec)
{
u32 i;
if (tmr) {
i = get_timer(0);
while ((get_timer(0) - i) < (usec / 1000))
;
}
}
#ifndef CONFIG_SPL_BUILD
static void timer_isr(void *arg)
{
timestamp++;
tmr->control = tmr->control | TIMER_INTERRUPT;
}
int timer_init (void)
{
int irq = -1;
u32 preload = 0;
u32 ret = 0;
const void *blob = gd->fdt_blob;
int node = 0;
u32 cell[2];
debug("TIMER: Initialization\n");
/* Do not init before relocation */
if (!(gd->flags & GD_FLG_RELOC))
return 0;
node = fdt_node_offset_by_compatible(blob, node,
"xlnx,xps-timer-1.00.a");
if (node != -1) {
fdt_addr_t base = fdtdec_get_addr(blob, node, "reg");
if (base == FDT_ADDR_T_NONE)
return -1;
debug("TIMER: Base addr %lx\n", base);
tmr = (microblaze_timer_t *)base;
ret = fdtdec_get_int_array(blob, node, "interrupts",
cell, ARRAY_SIZE(cell));
if (ret)
return ret;
irq = cell[0];
debug("TIMER: IRQ %x\n", irq);
preload = fdtdec_get_int(blob, node, "clock-frequency", 0);
preload /= CONFIG_SYS_HZ;
} else {
return node;
}
if (tmr && preload && irq >= 0) {
tmr->loadreg = preload;
tmr->control = TIMER_INTERRUPT | TIMER_RESET;
tmr->control = TIMER_ENABLE | TIMER_ENABLE_INTR |\
TIMER_RELOAD | TIMER_DOWN_COUNT;
timestamp = 0;
ret = install_interrupt_handler (irq, timer_isr, (void *)tmr);
if (ret)
tmr = NULL;
}
/* No problem if timer is not found/initialized */
return 0;
}
#else
int timer_init(void)
{
return 0;
}
#endif
/*
* This function is derived from PowerPC code (read timebase as long long).
* On Microblaze it just returns the timer value.
*/
unsigned long long get_ticks(void)
{
return get_timer(0);
}
/*
* This function is derived from PowerPC code (timebase clock frequency).
* On Microblaze it returns the number of timer ticks per second.
*/
ulong get_tbclk(void)
{
return CONFIG_SYS_HZ;
}