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>
21 #include <asm/arch/hardware.h>
22 #include <asm/arch/at91_tc.h>
23 #include <asm/arch/clk.h>
25 DECLARE_GLOBAL_DATA_PTR;
27 /* the number of clocks per CONFIG_SYS_HZ */
28 #define TIMER_LOAD_VAL (CONFIG_SYS_HZ_CLOCK/CONFIG_SYS_HZ)
32 at91_tc_t *tc = (at91_tc_t *) ATMEL_BASE_TC;
34 at91_periph_clk_enable(ATMEL_ID_TC0);
37 writel(AT91_TC_BMR_TC0XC0S_NONE | AT91_TC_BMR_TC1XC1S_NONE |
38 AT91_TC_BMR_TC2XC2S_NONE , &tc->bmr);
40 writel(AT91_TC_CCR_CLKDIS, &tc->tc[0].ccr);
41 /* set to MCLK/2 and restart the timer
42 when the value in TC_RC is reached */
43 writel(AT91_TC_CMR_TCCLKS_CLOCK1 | AT91_TC_CMR_CPCTRG, &tc->tc[0].cmr);
45 writel(0xFFFFFFFF, &tc->tc[0].idr); /* disable interrupts */
46 writel(TIMER_LOAD_VAL, &tc->tc[0].rc);
48 writel(AT91_TC_CCR_SWTRG | AT91_TC_CCR_CLKEN, &tc->tc[0].ccr);
56 * timer without interrupts
58 ulong get_timer_raw(void)
60 at91_tc_t *tc = (at91_tc_t *) ATMEL_BASE_TC;
63 now = readl(&tc->tc[0].cv) & 0x0000ffff;
65 if (now >= gd->arch.lastinc) {
67 gd->arch.tbl += now - gd->arch.lastinc;
69 /* we have an overflow ... */
70 gd->arch.tbl += now + TIMER_LOAD_VAL - gd->arch.lastinc;
72 gd->arch.lastinc = now;
77 static ulong get_timer_masked(void)
79 return get_timer_raw()/TIMER_LOAD_VAL;
82 ulong get_timer(ulong base)
84 return get_timer_masked() - base;
87 void __udelay(unsigned long usec)
93 tmo = CONFIG_SYS_HZ_CLOCK / 1000;
97 endtime = get_timer_raw() + tmo;
100 u32 now = get_timer_raw();
101 diff = endtime - now;
106 * This function is derived from PowerPC code (read timebase as long long).
107 * On ARM it just returns the timer value.
109 unsigned long long get_ticks(void)
115 * This function is derived from PowerPC code (timebase clock frequency).
116 * On ARM it returns the number of timer ticks per second.
118 ulong get_tbclk(void)
120 return CONFIG_SYS_HZ;