2 * (C) Copyright 2009 Faraday Technology
3 * Po-Yu Chuang <ratbert@faraday-tech.com>
5 * Copyright (C) 2011 Andes Technology Corporation
6 * Shawn Lin, Andes Technology Corporation <nobuhiro@andestech.com>
7 * Macpaul Lin, Andes Technology Corporation <macpaul@andestech.com>
9 * SPDX-License-Identifier: GPL-2.0+
14 #include <faraday/fttmr010.h>
16 static ulong timestamp;
21 struct fttmr010 *tmr = (struct fttmr010 *)CONFIG_FTTMR010_BASE;
24 debug("%s()\n", __func__);
29 #ifdef CONFIG_FTTMR010_EXT_CLK
30 /* use 32768Hz oscillator for RTC, WDT, TIMER */
31 ftpmu010_32768osc_enable();
35 writel(TIMER_LOAD_VAL, &tmr->timer3_load);
36 writel(TIMER_LOAD_VAL, &tmr->timer3_counter);
37 writel(0, &tmr->timer3_match1);
38 writel(0, &tmr->timer3_match2);
40 /* we don't want timer to issue interrupts */
41 writel(FTTMR010_TM3_MATCH1 |
43 FTTMR010_TM3_OVERFLOW,
44 &tmr->interrupt_mask);
47 #ifdef CONFIG_FTTMR010_EXT_CLK
48 cr |= FTTMR010_TM3_CLOCK; /* use external clock */
50 cr |= FTTMR010_TM3_ENABLE;
53 /* init the timestamp and lastdec value */
60 * timer without interrupts
66 void reset_timer_masked(void)
68 struct fttmr010 *tmr = (struct fttmr010 *)CONFIG_FTTMR010_BASE;
70 /* capure current decrementer value time */
71 #ifdef CONFIG_FTTMR010_EXT_CLK
72 lastdec = readl(&tmr->timer3_counter) / (TIMER_CLOCK / CONFIG_SYS_HZ);
74 lastdec = readl(&tmr->timer3_counter) / (CONFIG_SYS_CLK_FREQ / 2);
76 timestamp = 0; /* start "advancing" time stamp from 0 */
78 debug("%s(): lastdec = %lx\n", __func__, lastdec);
81 void reset_timer(void)
83 debug("%s()\n", __func__);
90 ulong get_timer_masked(void)
92 struct fttmr010 *tmr = (struct fttmr010 *)CONFIG_FTTMR010_BASE;
94 /* current tick value */
95 #ifdef CONFIG_FTTMR010_EXT_CLK
96 ulong now = readl(&tmr->timer3_counter) / (TIMER_CLOCK / CONFIG_SYS_HZ);
98 ulong now = readl(&tmr->timer3_counter) / \
99 (CONFIG_SYS_CLK_FREQ / 2 / 1024);
102 debug("%s(): now = %lx, lastdec = %lx\n", __func__, now, lastdec);
104 if (lastdec >= now) {
106 * normal mode (non roll)
107 * move stamp fordward with absoulte diff ticks
109 timestamp += lastdec - now;
112 * we have overflow of the count down timer
114 * nts = ts + ld + (TLV - now)
115 * ts=old stamp, ld=time that passed before passing through -1
116 * (TLV-now) amount of time after passing though -1
117 * nts = new "advancing time stamp"...it could also roll and
120 timestamp += lastdec + TIMER_LOAD_VAL - now;
125 debug("%s() returns %lx\n", __func__, timestamp);
131 * return difference between timer ticks and base
133 ulong get_timer(ulong base)
135 debug("%s(%lx)\n", __func__, base);
136 return get_timer_masked() - base;
139 void set_timer(ulong t)
141 debug("%s(%lx)\n", __func__, t);
145 /* delay x useconds AND preserve advance timestamp value */
146 void __udelay(unsigned long usec)
148 struct fttmr010 *tmr = (struct fttmr010 *)CONFIG_FTTMR010_BASE;
150 #ifdef CONFIG_FTTMR010_EXT_CLK
151 long tmo = usec * (TIMER_CLOCK / 1000) / 1000;
153 long tmo = usec * ((CONFIG_SYS_CLK_FREQ / 2) / 1000) / 1000;
155 unsigned long now, last = readl(&tmr->timer3_counter);
157 debug("%s(%lu)\n", __func__, usec);
159 now = readl(&tmr->timer3_counter);
160 if (now > last) /* count down timer overflow */
161 tmo -= TIMER_LOAD_VAL + last - now;
169 * This function is derived from PowerPC code (read timebase as long long).
170 * On ARM it just returns the timer value.
172 unsigned long long get_ticks(void)
174 debug("%s()\n", __func__);
179 * This function is derived from PowerPC code (timebase clock frequency).
180 * On ARM it returns the number of timer ticks per second.
182 ulong get_tbclk(void)
184 debug("%s()\n", __func__);
185 #ifdef CONFIG_FTTMR010_EXT_CLK
186 return CONFIG_SYS_HZ;
188 return CONFIG_SYS_CLK_FREQ;