2 * (C) Copyright 2007 Michal Simek
4 * Michal SIMEK <monstr@monstr.eu>
6 * SPDX-License-Identifier: GPL-2.0+
11 #include <asm/microblaze_timer.h>
12 #include <asm/microblaze_intc.h>
14 DECLARE_GLOBAL_DATA_PTR;
16 volatile int timestamp = 0;
17 microblaze_timer_t *tmr;
19 ulong get_timer (ulong base)
22 return timestamp - base;
23 return timestamp++ - base;
26 void __udelay(unsigned long usec)
32 while ((get_timer(0) - i) < (usec / 1000))
37 #ifndef CONFIG_SPL_BUILD
38 static void timer_isr(void *arg)
41 tmr->control = tmr->control | TIMER_INTERRUPT;
49 const void *blob = gd->fdt_blob;
53 debug("TIMER: Initialization\n");
55 node = fdt_node_offset_by_compatible(blob, node,
56 "xlnx,xps-timer-1.00.a");
58 fdt_addr_t base = fdtdec_get_addr(blob, node, "reg");
59 if (base == FDT_ADDR_T_NONE)
62 debug("TIMER: Base addr %lx\n", base);
63 tmr = (microblaze_timer_t *)base;
65 ret = fdtdec_get_int_array(blob, node, "interrupts",
66 cell, ARRAY_SIZE(cell));
71 debug("TIMER: IRQ %x\n", irq);
73 preload = fdtdec_get_int(blob, node, "clock-frequency", 0);
74 preload /= CONFIG_SYS_HZ;
79 if (tmr && preload && irq >= 0) {
80 tmr->loadreg = preload;
81 tmr->control = TIMER_INTERRUPT | TIMER_RESET;
82 tmr->control = TIMER_ENABLE | TIMER_ENABLE_INTR |\
83 TIMER_RELOAD | TIMER_DOWN_COUNT;
85 ret = install_interrupt_handler (irq, timer_isr, (void *)tmr);
89 /* No problem if timer is not found/initialized */
100 * This function is derived from PowerPC code (read timebase as long long).
101 * On Microblaze it just returns the timer value.
103 unsigned long long get_ticks(void)
109 * This function is derived from PowerPC code (timebase clock frequency).
110 * On Microblaze it returns the number of timer ticks per second.
112 ulong get_tbclk(void)
114 return CONFIG_SYS_HZ;