1 // SPDX-License-Identifier: GPL-2.0+
4 * Lineo, Inc. <www.lineo.com>
5 * Bernhard Kuhn <bkuhn@lineo.com>
8 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
9 * Marius Groeger <mgroeger@sysgo.de>
12 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
13 * Alex Zuepke <azu@sysgo.de>
19 #include <asm/arch/hardware.h>
20 #include <asm/arch/at91_tc.h>
21 #include <asm/arch/clk.h>
23 DECLARE_GLOBAL_DATA_PTR;
25 /* the number of clocks per CONFIG_SYS_HZ */
26 #define TIMER_LOAD_VAL (CONFIG_SYS_HZ_CLOCK/CONFIG_SYS_HZ)
30 at91_tc_t *tc = (at91_tc_t *) ATMEL_BASE_TC;
32 at91_periph_clk_enable(ATMEL_ID_TC0);
35 writel(AT91_TC_BMR_TC0XC0S_NONE | AT91_TC_BMR_TC1XC1S_NONE |
36 AT91_TC_BMR_TC2XC2S_NONE , &tc->bmr);
38 writel(AT91_TC_CCR_CLKDIS, &tc->tc[0].ccr);
39 /* set to MCLK/2 and restart the timer
40 when the value in TC_RC is reached */
41 writel(AT91_TC_CMR_TCCLKS_CLOCK1 | AT91_TC_CMR_CPCTRG, &tc->tc[0].cmr);
43 writel(0xFFFFFFFF, &tc->tc[0].idr); /* disable interrupts */
44 writel(TIMER_LOAD_VAL, &tc->tc[0].rc);
46 writel(AT91_TC_CCR_SWTRG | AT91_TC_CCR_CLKEN, &tc->tc[0].ccr);
54 * timer without interrupts
56 ulong get_timer(ulong base)
58 return get_timer_masked() - base;
61 void __udelay(unsigned long usec)
66 ulong get_timer_raw(void)
68 at91_tc_t *tc = (at91_tc_t *) ATMEL_BASE_TC;
71 now = readl(&tc->tc[0].cv) & 0x0000ffff;
73 if (now >= gd->arch.lastinc) {
75 gd->arch.tbl += now - gd->arch.lastinc;
77 /* we have an overflow ... */
78 gd->arch.tbl += now + TIMER_LOAD_VAL - gd->arch.lastinc;
80 gd->arch.lastinc = now;
85 ulong get_timer_masked(void)
87 return get_timer_raw()/TIMER_LOAD_VAL;
90 void udelay_masked(unsigned long usec)
96 tmo = CONFIG_SYS_HZ_CLOCK / 1000;
100 endtime = get_timer_raw() + tmo;
103 u32 now = get_timer_raw();
104 diff = endtime - now;
109 * This function is derived from PowerPC code (read timebase as long long).
110 * On ARM it just returns the timer value.
112 unsigned long long get_ticks(void)
118 * This function is derived from PowerPC code (timebase clock frequency).
119 * On ARM it returns the number of timer ticks per second.
121 ulong get_tbclk(void)
123 return CONFIG_SYS_HZ;