1 /*
2 * Copyright 2014 Broadcom Corporation.
3 *
4 * SPDX-License-Identifier: GPL-2.0+
5 */
6
7 #include <common.h>
8 #include <div64.h>
9 #include <asm/io.h>
10 #include <asm/iproc-common/timer.h>
11 #include <asm/iproc-common/sysmap.h>
12
timer_global_read(void)13 static inline uint64_t timer_global_read(void)
14 {
15 uint64_t cur_tick;
16 uint32_t count_h;
17 uint32_t count_l;
18
19 do {
20 count_h = readl(IPROC_PERIPH_GLB_TIM_REG_BASE +
21 TIMER_GLB_HI_OFFSET);
22 count_l = readl(IPROC_PERIPH_GLB_TIM_REG_BASE +
23 TIMER_GLB_LOW_OFFSET);
24 cur_tick = readl(IPROC_PERIPH_GLB_TIM_REG_BASE +
25 TIMER_GLB_HI_OFFSET);
26 } while (cur_tick != count_h);
27
28 return (cur_tick << 32) + count_l;
29 }
30
timer_global_init(void)31 void timer_global_init(void)
32 {
33 writel(0, IPROC_PERIPH_GLB_TIM_REG_BASE + TIMER_GLB_CTRL_OFFSET);
34 writel(0, IPROC_PERIPH_GLB_TIM_REG_BASE + TIMER_GLB_LOW_OFFSET);
35 writel(0, IPROC_PERIPH_GLB_TIM_REG_BASE + TIMER_GLB_HI_OFFSET);
36 writel(TIMER_GLB_TIM_CTRL_TIM_EN,
37 IPROC_PERIPH_GLB_TIM_REG_BASE + TIMER_GLB_CTRL_OFFSET);
38 }
39
timer_init(void)40 int timer_init(void)
41 {
42 timer_global_init();
43 return 0;
44 }
45
get_timer(unsigned long base)46 unsigned long get_timer(unsigned long base)
47 {
48 uint64_t count;
49 uint64_t ret;
50 uint64_t tim_clk;
51 uint64_t periph_clk;
52
53 count = timer_global_read();
54
55 /* default arm clk is 1GHz, periph_clk=arm_clk/2, tick per msec */
56 periph_clk = 500000;
57 tim_clk = lldiv(periph_clk,
58 (((readl(IPROC_PERIPH_GLB_TIM_REG_BASE +
59 TIMER_GLB_CTRL_OFFSET) &
60 TIMER_GLB_TIM_CTRL_PRESC_MASK) >> 8) + 1));
61
62 ret = lldiv(count, (uint32_t)tim_clk);
63
64 /* returns msec */
65 return ret - base;
66 }
67
__udelay(unsigned long usec)68 void __udelay(unsigned long usec)
69 {
70 uint64_t cur_tick, end_tick;
71 uint64_t tim_clk;
72 uint64_t periph_clk;
73
74 /* default arm clk is 1GHz, periph_clk=arm_clk/2, tick per usec */
75 periph_clk = 500;
76
77 tim_clk = lldiv(periph_clk,
78 (((readl(IPROC_PERIPH_GLB_TIM_REG_BASE +
79 TIMER_GLB_CTRL_OFFSET) &
80 TIMER_GLB_TIM_CTRL_PRESC_MASK) >> 8) + 1));
81
82 cur_tick = timer_global_read();
83
84 end_tick = tim_clk;
85 end_tick *= usec;
86 end_tick += cur_tick;
87
88 do {
89 cur_tick = timer_global_read();
90
91 } while (cur_tick < end_tick);
92 }
93
timer_systick_init(uint32_t tick_ms)94 void timer_systick_init(uint32_t tick_ms)
95 {
96 /* Disable timer and clear interrupt status*/
97 writel(0, IPROC_PERIPH_PVT_TIM_REG_BASE + TIMER_PVT_CTRL_OFFSET);
98 writel(TIMER_PVT_TIM_INT_STATUS_SET,
99 IPROC_PERIPH_PVT_TIM_REG_BASE + TIMER_PVT_STATUS_OFFSET);
100 writel((PLL_AXI_CLK/1000) * tick_ms,
101 IPROC_PERIPH_PVT_TIM_REG_BASE + TIMER_PVT_LOAD_OFFSET);
102 writel(TIMER_PVT_TIM_CTRL_INT_EN |
103 TIMER_PVT_TIM_CTRL_AUTO_RELD |
104 TIMER_PVT_TIM_CTRL_TIM_EN,
105 IPROC_PERIPH_PVT_TIM_REG_BASE + TIMER_PVT_CTRL_OFFSET);
106 }
107
timer_systick_isr(void * data)108 void timer_systick_isr(void *data)
109 {
110 writel(TIMER_PVT_TIM_INT_STATUS_SET,
111 IPROC_PERIPH_PVT_TIM_REG_BASE + TIMER_PVT_STATUS_OFFSET);
112 }
113
114 /*
115 * This function is derived from PowerPC code (read timebase as long long).
116 * On ARM it just returns the timer value in msec.
117 */
get_ticks(void)118 unsigned long long get_ticks(void)
119 {
120 return get_timer(0);
121 }
122
123 /*
124 * This is used in conjuction with get_ticks, which returns msec as ticks.
125 * Here we just return ticks/sec = msec/sec = 1000
126 */
get_tbclk(void)127 ulong get_tbclk(void)
128 {
129 return 1000;
130 }
131