123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120 |
- // SPDX-License-Identifier: GPL-2.0+
- /*
- * (C) Copyright 2002
- * Lineo, Inc. <www.lineo.com>
- * Bernhard Kuhn <bkuhn@lineo.com>
- *
- * (C) Copyright 2002
- * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
- * Marius Groeger <mgroeger@sysgo.de>
- *
- * (C) Copyright 2002
- * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
- * Alex Zuepke <azu@sysgo.de>
- */
- #include <common.h>
- #include <time.h>
- #include <asm/io.h>
- #include <asm/arch/hardware.h>
- #include <asm/arch/at91_tc.h>
- #include <asm/arch/clk.h>
- DECLARE_GLOBAL_DATA_PTR;
- /* the number of clocks per CONFIG_SYS_HZ */
- #define TIMER_LOAD_VAL (CONFIG_SYS_HZ_CLOCK/CONFIG_SYS_HZ)
- int timer_init(void)
- {
- at91_tc_t *tc = (at91_tc_t *) ATMEL_BASE_TC;
- at91_periph_clk_enable(ATMEL_ID_TC0);
- writel(0, &tc->bcr);
- writel(AT91_TC_BMR_TC0XC0S_NONE | AT91_TC_BMR_TC1XC1S_NONE |
- AT91_TC_BMR_TC2XC2S_NONE , &tc->bmr);
- writel(AT91_TC_CCR_CLKDIS, &tc->tc[0].ccr);
- /* set to MCLK/2 and restart the timer
- when the value in TC_RC is reached */
- writel(AT91_TC_CMR_TCCLKS_CLOCK1 | AT91_TC_CMR_CPCTRG, &tc->tc[0].cmr);
- writel(0xFFFFFFFF, &tc->tc[0].idr); /* disable interrupts */
- writel(TIMER_LOAD_VAL, &tc->tc[0].rc);
- writel(AT91_TC_CCR_SWTRG | AT91_TC_CCR_CLKEN, &tc->tc[0].ccr);
- gd->arch.lastinc = 0;
- gd->arch.tbl = 0;
- return 0;
- }
- /*
- * timer without interrupts
- */
- ulong get_timer_raw(void)
- {
- at91_tc_t *tc = (at91_tc_t *) ATMEL_BASE_TC;
- u32 now;
- now = readl(&tc->tc[0].cv) & 0x0000ffff;
- if (now >= gd->arch.lastinc) {
- /* normal mode */
- gd->arch.tbl += now - gd->arch.lastinc;
- } else {
- /* we have an overflow ... */
- gd->arch.tbl += now + TIMER_LOAD_VAL - gd->arch.lastinc;
- }
- gd->arch.lastinc = now;
- return gd->arch.tbl;
- }
- static ulong get_timer_masked(void)
- {
- return get_timer_raw()/TIMER_LOAD_VAL;
- }
- ulong get_timer(ulong base)
- {
- return get_timer_masked() - base;
- }
- void __udelay(unsigned long usec)
- {
- u32 tmo;
- u32 endtime;
- signed long diff;
- tmo = CONFIG_SYS_HZ_CLOCK / 1000;
- tmo *= usec;
- tmo /= 1000;
- endtime = get_timer_raw() + tmo;
- do {
- u32 now = get_timer_raw();
- diff = endtime - now;
- } while (diff >= 0);
- }
- /*
- * This function is derived from PowerPC code (read timebase as long long).
- * On ARM it just returns the timer value.
- */
- unsigned long long get_ticks(void)
- {
- return get_timer(0);
- }
- /*
- * This function is derived from PowerPC code (timebase clock frequency).
- * On ARM it returns the number of timer ticks per second.
- */
- ulong get_tbclk(void)
- {
- return CONFIG_SYS_HZ;
- }
|