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