1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * (C) Copyright 2007 Michal Simek 4 * 5 * Michal SIMEK <monstr@monstr.eu> 6 */ 7 8 #include <common.h> 9 #include <fdtdec.h> 10 #include <asm/microblaze_timer.h> 11 #include <asm/microblaze_intc.h> 12 13 DECLARE_GLOBAL_DATA_PTR; 14 15 volatile int timestamp = 0; 16 microblaze_timer_t *tmr; 17 18 ulong get_timer (ulong base) 19 { 20 if (tmr) 21 return timestamp - base; 22 return timestamp++ - base; 23 } 24 25 void __udelay(unsigned long usec) 26 { 27 u32 i; 28 29 if (tmr) { 30 i = get_timer(0); 31 while ((get_timer(0) - i) < (usec / 1000)) 32 ; 33 } 34 } 35 36 #ifndef CONFIG_SPL_BUILD 37 static void timer_isr(void *arg) 38 { 39 timestamp++; 40 tmr->control = tmr->control | TIMER_INTERRUPT; 41 } 42 43 int timer_init (void) 44 { 45 int irq = -1; 46 u32 preload = 0; 47 u32 ret = 0; 48 const void *blob = gd->fdt_blob; 49 int node = 0; 50 u32 cell[2]; 51 52 debug("TIMER: Initialization\n"); 53 54 node = fdt_node_offset_by_compatible(blob, node, 55 "xlnx,xps-timer-1.00.a"); 56 if (node != -1) { 57 fdt_addr_t base = fdtdec_get_addr(blob, node, "reg"); 58 if (base == FDT_ADDR_T_NONE) 59 return -1; 60 61 debug("TIMER: Base addr %lx\n", base); 62 tmr = (microblaze_timer_t *)base; 63 64 ret = fdtdec_get_int_array(blob, node, "interrupts", 65 cell, ARRAY_SIZE(cell)); 66 if (ret) 67 return ret; 68 69 irq = cell[0]; 70 debug("TIMER: IRQ %x\n", irq); 71 72 preload = fdtdec_get_int(blob, node, "clock-frequency", 0); 73 preload /= CONFIG_SYS_HZ; 74 } else { 75 return node; 76 } 77 78 if (tmr && preload && irq >= 0) { 79 tmr->loadreg = preload; 80 tmr->control = TIMER_INTERRUPT | TIMER_RESET; 81 tmr->control = TIMER_ENABLE | TIMER_ENABLE_INTR |\ 82 TIMER_RELOAD | TIMER_DOWN_COUNT; 83 timestamp = 0; 84 ret = install_interrupt_handler (irq, timer_isr, (void *)tmr); 85 if (ret) 86 tmr = NULL; 87 } 88 /* No problem if timer is not found/initialized */ 89 return 0; 90 } 91 #else 92 int timer_init(void) 93 { 94 return 0; 95 } 96 #endif 97 98 /* 99 * This function is derived from PowerPC code (read timebase as long long). 100 * On Microblaze it just returns the timer value. 101 */ 102 unsigned long long get_ticks(void) 103 { 104 return get_timer(0); 105 } 106 107 /* 108 * This function is derived from PowerPC code (timebase clock frequency). 109 * On Microblaze it returns the number of timer ticks per second. 110 */ 111 ulong get_tbclk(void) 112 { 113 return CONFIG_SYS_HZ; 114 } 115