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>
20 #include <asm/arch/hardware.h>
21 #include <asm/arch/at91_tc.h>
22 #include <asm/arch/clk.h>
24 DECLARE_GLOBAL_DATA_PTR;
26 /* the number of clocks per CONFIG_SYS_HZ */
27 #define TIMER_LOAD_VAL (CONFIG_SYS_HZ_CLOCK/CONFIG_SYS_HZ)
31 at91_tc_t *tc = (at91_tc_t *) ATMEL_BASE_TC;
33 at91_periph_clk_enable(ATMEL_ID_TC0);
36 writel(AT91_TC_BMR_TC0XC0S_NONE | AT91_TC_BMR_TC1XC1S_NONE |
37 AT91_TC_BMR_TC2XC2S_NONE , &tc->bmr);
39 writel(AT91_TC_CCR_CLKDIS, &tc->tc[0].ccr);
40 /* set to MCLK/2 and restart the timer
41 when the value in TC_RC is reached */
42 writel(AT91_TC_CMR_TCCLKS_CLOCK1 | AT91_TC_CMR_CPCTRG, &tc->tc[0].cmr);
44 writel(0xFFFFFFFF, &tc->tc[0].idr); /* disable interrupts */
45 writel(TIMER_LOAD_VAL, &tc->tc[0].rc);
47 writel(AT91_TC_CCR_SWTRG | AT91_TC_CCR_CLKEN, &tc->tc[0].ccr);
55 * timer without interrupts
57 ulong get_timer_raw(void)
59 at91_tc_t *tc = (at91_tc_t *) ATMEL_BASE_TC;
62 now = readl(&tc->tc[0].cv) & 0x0000ffff;
64 if (now >= gd->arch.lastinc) {
66 gd->arch.tbl += now - gd->arch.lastinc;
68 /* we have an overflow ... */
69 gd->arch.tbl += now + TIMER_LOAD_VAL - gd->arch.lastinc;
71 gd->arch.lastinc = now;
76 static ulong get_timer_masked(void)
78 return get_timer_raw()/TIMER_LOAD_VAL;
81 ulong get_timer(ulong base)
83 return get_timer_masked() - base;
86 void __udelay(unsigned long usec)
92 tmo = CONFIG_SYS_HZ_CLOCK / 1000;
96 endtime = get_timer_raw() + tmo;
99 u32 now = get_timer_raw();
100 diff = endtime - now;
105 * This function is derived from PowerPC code (read timebase as long long).
106 * On ARM it just returns the timer value.
108 unsigned long long get_ticks(void)
114 * This function is derived from PowerPC code (timebase clock frequency).
115 * On ARM it returns the number of timer ticks per second.
117 ulong get_tbclk(void)
119 return CONFIG_SYS_HZ;