1 /* 2 * (C) Copyright 2007 Michal Simek 3 * 4 * Michal SIMEK <monstr@monstr.eu> 5 * 6 * SPDX-License-Identifier: GPL-2.0+ 7 */ 8 9 #include <common.h> 10 #include <fdtdec.h> 11 #include <asm/microblaze_timer.h> 12 #include <asm/microblaze_intc.h> 13 14 DECLARE_GLOBAL_DATA_PTR; 15 16 volatile int timestamp = 0; 17 microblaze_timer_t *tmr; 18 19 ulong get_timer (ulong base) 20 { 21 if (tmr) 22 return timestamp - base; 23 return timestamp++ - base; 24 } 25 26 void __udelay(unsigned long usec) 27 { 28 u32 i; 29 30 if (tmr) { 31 i = get_timer(0); 32 while ((get_timer(0) - i) < (usec / 1000)) 33 ; 34 } 35 } 36 37 #ifndef CONFIG_SPL_BUILD 38 static void timer_isr(void *arg) 39 { 40 timestamp++; 41 tmr->control = tmr->control | TIMER_INTERRUPT; 42 } 43 44 int timer_init (void) 45 { 46 int irq = -1; 47 u32 preload = 0; 48 u32 ret = 0; 49 const void *blob = gd->fdt_blob; 50 int node = 0; 51 u32 cell[2]; 52 53 debug("TIMER: Initialization\n"); 54 55 node = fdt_node_offset_by_compatible(blob, node, 56 "xlnx,xps-timer-1.00.a"); 57 if (node != -1) { 58 fdt_addr_t base = fdtdec_get_addr(blob, node, "reg"); 59 if (base == FDT_ADDR_T_NONE) 60 return -1; 61 62 debug("TIMER: Base addr %lx\n", base); 63 tmr = (microblaze_timer_t *)base; 64 65 ret = fdtdec_get_int_array(blob, node, "interrupts", 66 cell, ARRAY_SIZE(cell)); 67 if (ret) 68 return ret; 69 70 irq = cell[0]; 71 debug("TIMER: IRQ %x\n", irq); 72 73 preload = fdtdec_get_int(blob, node, "clock-frequency", 0); 74 preload /= CONFIG_SYS_HZ; 75 } else { 76 return node; 77 } 78 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; 84 timestamp = 0; 85 ret = install_interrupt_handler (irq, timer_isr, (void *)tmr); 86 if (ret) 87 tmr = NULL; 88 } 89 /* No problem if timer is not found/initialized */ 90 return 0; 91 } 92 #else 93 int timer_init(void) 94 { 95 return 0; 96 } 97 #endif 98 99 /* 100 * This function is derived from PowerPC code (read timebase as long long). 101 * On Microblaze it just returns the timer value. 102 */ 103 unsigned long long get_ticks(void) 104 { 105 return get_timer(0); 106 } 107 108 /* 109 * This function is derived from PowerPC code (timebase clock frequency). 110 * On Microblaze it returns the number of timer ticks per second. 111 */ 112 ulong get_tbclk(void) 113 { 114 return CONFIG_SYS_HZ; 115 } 116