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
get_timer(ulong base)18 ulong get_timer (ulong base)
19 {
20 if (tmr)
21 return timestamp - base;
22 return timestamp++ - base;
23 }
24
__udelay(unsigned long usec)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
timer_isr(void * arg)37 static void timer_isr(void *arg)
38 {
39 timestamp++;
40 tmr->control = tmr->control | TIMER_INTERRUPT;
41 }
42
timer_init(void)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 /* Do not init before relocation */
55 if (!(gd->flags & GD_FLG_RELOC))
56 return 0;
57
58 node = fdt_node_offset_by_compatible(blob, node,
59 "xlnx,xps-timer-1.00.a");
60 if (node != -1) {
61 fdt_addr_t base = fdtdec_get_addr(blob, node, "reg");
62 if (base == FDT_ADDR_T_NONE)
63 return -1;
64
65 debug("TIMER: Base addr %lx\n", base);
66 tmr = (microblaze_timer_t *)base;
67
68 ret = fdtdec_get_int_array(blob, node, "interrupts",
69 cell, ARRAY_SIZE(cell));
70 if (ret)
71 return ret;
72
73 irq = cell[0];
74 debug("TIMER: IRQ %x\n", irq);
75
76 preload = fdtdec_get_int(blob, node, "clock-frequency", 0);
77 preload /= CONFIG_SYS_HZ;
78 } else {
79 return node;
80 }
81
82 if (tmr && preload && irq >= 0) {
83 tmr->loadreg = preload;
84 tmr->control = TIMER_INTERRUPT | TIMER_RESET;
85 tmr->control = TIMER_ENABLE | TIMER_ENABLE_INTR |\
86 TIMER_RELOAD | TIMER_DOWN_COUNT;
87 timestamp = 0;
88 ret = install_interrupt_handler (irq, timer_isr, (void *)tmr);
89 if (ret)
90 tmr = NULL;
91 }
92 /* No problem if timer is not found/initialized */
93 return 0;
94 }
95 #else
timer_init(void)96 int timer_init(void)
97 {
98 return 0;
99 }
100 #endif
101
102 /*
103 * This function is derived from PowerPC code (read timebase as long long).
104 * On Microblaze it just returns the timer value.
105 */
get_ticks(void)106 unsigned long long get_ticks(void)
107 {
108 return get_timer(0);
109 }
110
111 /*
112 * This function is derived from PowerPC code (timebase clock frequency).
113 * On Microblaze it returns the number of timer ticks per second.
114 */
get_tbclk(void)115 ulong get_tbclk(void)
116 {
117 return CONFIG_SYS_HZ;
118 }
119