1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * (C) Copyright 2009 Faraday Technology
4 * Po-Yu Chuang <ratbert@faraday-tech.com>
5 *
6 * Copyright (C) 2011 Andes Technology Corporation
7 * Shawn Lin, Andes Technology Corporation <nobuhiro@andestech.com>
8 * Macpaul Lin, Andes Technology Corporation <macpaul@andestech.com>
9 */
10 #ifndef CONFIG_TIMER
11 #include <common.h>
12 #include <irq_func.h>
13 #include <time.h>
14 #include <asm/io.h>
15 #include <faraday/fttmr010.h>
16
17 static ulong timestamp;
18 static ulong lastdec;
19
timer_init(void)20 int timer_init(void)
21 {
22 struct fttmr010 *tmr = (struct fttmr010 *)CONFIG_FTTMR010_BASE;
23 unsigned int cr;
24
25 debug("%s()\n", __func__);
26
27 /* disable timers */
28 writel(0, &tmr->cr);
29
30 #ifdef CONFIG_FTTMR010_EXT_CLK
31 /* use 32768Hz oscillator for RTC, WDT, TIMER */
32 ftpmu010_32768osc_enable();
33 #endif
34
35 /* setup timer */
36 writel(TIMER_LOAD_VAL, &tmr->timer3_load);
37 writel(TIMER_LOAD_VAL, &tmr->timer3_counter);
38 writel(0, &tmr->timer3_match1);
39 writel(0, &tmr->timer3_match2);
40
41 /* we don't want timer to issue interrupts */
42 writel(FTTMR010_TM3_MATCH1 |
43 FTTMR010_TM3_MATCH2 |
44 FTTMR010_TM3_OVERFLOW,
45 &tmr->interrupt_mask);
46
47 cr = readl(&tmr->cr);
48 #ifdef CONFIG_FTTMR010_EXT_CLK
49 cr |= FTTMR010_TM3_CLOCK; /* use external clock */
50 #endif
51 cr |= FTTMR010_TM3_ENABLE;
52 writel(cr, &tmr->cr);
53
54 /* init the timestamp and lastdec value */
55 reset_timer_masked();
56
57 return 0;
58 }
59
60 /*
61 * timer without interrupts
62 */
63
64 /*
65 * reset time
66 */
reset_timer_masked(void)67 void reset_timer_masked(void)
68 {
69 struct fttmr010 *tmr = (struct fttmr010 *)CONFIG_FTTMR010_BASE;
70
71 /* capure current decrementer value time */
72 #ifdef CONFIG_FTTMR010_EXT_CLK
73 lastdec = readl(&tmr->timer3_counter) / (TIMER_CLOCK / CONFIG_SYS_HZ);
74 #else
75 lastdec = readl(&tmr->timer3_counter) /
76 (CONFIG_SYS_CLK_FREQ / 2 / CONFIG_SYS_HZ);
77 #endif
78 timestamp = 0; /* start "advancing" time stamp from 0 */
79
80 debug("%s(): lastdec = %lx\n", __func__, lastdec);
81 }
82
reset_timer(void)83 void reset_timer(void)
84 {
85 debug("%s()\n", __func__);
86 reset_timer_masked();
87 }
88
89 /*
90 * return timer ticks
91 */
get_timer_masked(void)92 ulong get_timer_masked(void)
93 {
94 struct fttmr010 *tmr = (struct fttmr010 *)CONFIG_FTTMR010_BASE;
95
96 /* current tick value */
97 #ifdef CONFIG_FTTMR010_EXT_CLK
98 ulong now = readl(&tmr->timer3_counter) / (TIMER_CLOCK / CONFIG_SYS_HZ);
99 #else
100 ulong now = readl(&tmr->timer3_counter) /
101 (CONFIG_SYS_CLK_FREQ / 2 / CONFIG_SYS_HZ);
102 #endif
103
104 debug("%s(): now = %lx, lastdec = %lx\n", __func__, now, lastdec);
105
106 if (lastdec >= now) {
107 /*
108 * normal mode (non roll)
109 * move stamp fordward with absoulte diff ticks
110 */
111 timestamp += lastdec - now;
112 } else {
113 /*
114 * we have overflow of the count down timer
115 *
116 * nts = ts + ld + (TLV - now)
117 * ts=old stamp, ld=time that passed before passing through -1
118 * (TLV-now) amount of time after passing though -1
119 * nts = new "advancing time stamp"...it could also roll and
120 * cause problems.
121 */
122 timestamp += lastdec + TIMER_LOAD_VAL - now;
123 }
124
125 lastdec = now;
126
127 debug("%s() returns %lx\n", __func__, timestamp);
128
129 return timestamp;
130 }
131
132 /*
133 * return difference between timer ticks and base
134 */
get_timer(ulong base)135 ulong get_timer(ulong base)
136 {
137 debug("%s(%lx)\n", __func__, base);
138 return get_timer_masked() - base;
139 }
140
set_timer(ulong t)141 void set_timer(ulong t)
142 {
143 debug("%s(%lx)\n", __func__, t);
144 timestamp = t;
145 }
146
147 /* delay x useconds AND preserve advance timestamp value */
__udelay(unsigned long usec)148 void __udelay(unsigned long usec)
149 {
150 struct fttmr010 *tmr = (struct fttmr010 *)CONFIG_FTTMR010_BASE;
151
152 #ifdef CONFIG_FTTMR010_EXT_CLK
153 long tmo = usec * (TIMER_CLOCK / 1000) / 1000;
154 #else
155 long tmo = usec * ((CONFIG_SYS_CLK_FREQ / 2) / 1000) / 1000;
156 #endif
157 unsigned long now, last = readl(&tmr->timer3_counter);
158
159 debug("%s(%lu)\n", __func__, usec);
160 while (tmo > 0) {
161 now = readl(&tmr->timer3_counter);
162 if (now > last) /* count down timer overflow */
163 tmo -= TIMER_LOAD_VAL + last - now;
164 else
165 tmo -= last - now;
166 last = now;
167 }
168 }
169
170 /*
171 * This function is derived from PowerPC code (read timebase as long long).
172 * On ARM it just returns the timer value.
173 */
get_ticks(void)174 unsigned long long get_ticks(void)
175 {
176 debug("%s()\n", __func__);
177 return get_timer(0);
178 }
179
180 /*
181 * This function is derived from PowerPC code (timebase clock frequency).
182 * On ARM it returns the number of timer ticks per second.
183 */
get_tbclk(void)184 ulong get_tbclk(void)
185 {
186 debug("%s()\n", __func__);
187 #ifdef CONFIG_FTTMR010_EXT_CLK
188 return CONFIG_SYS_HZ;
189 #else
190 return CONFIG_SYS_CLK_FREQ;
191 #endif
192 }
193 #endif /* CONFIG_TIMER */
194