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- /*
- * Copyright 2013 Freescale Semiconductor, Inc.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
- */
- #include <common.h>
- #include <asm/io.h>
- #include <div64.h>
- #include <asm/arch/imx-regs.h>
- #include <asm/arch/clock.h>
- static struct pit_reg *cur_pit = (struct pit_reg *)PIT_BASE_ADDR;
- DECLARE_GLOBAL_DATA_PTR;
- #define TIMER_LOAD_VAL 0xffffffff
- static inline unsigned long long tick_to_time(unsigned long long tick)
- {
- tick *= CONFIG_SYS_HZ;
- do_div(tick, mxc_get_clock(MXC_IPG_CLK));
- return tick;
- }
- static inline unsigned long long us_to_tick(unsigned long long usec)
- {
- usec = usec * mxc_get_clock(MXC_IPG_CLK) + 999999;
- do_div(usec, 1000000);
- return usec;
- }
- int timer_init(void)
- {
- __raw_writel(0, &cur_pit->mcr);
- __raw_writel(TIMER_LOAD_VAL, &cur_pit->ldval1);
- __raw_writel(0, &cur_pit->tctrl1);
- __raw_writel(1, &cur_pit->tctrl1);
- gd->arch.tbl = 0;
- gd->arch.tbu = 0;
- return 0;
- }
- unsigned long long get_ticks(void)
- {
- ulong now = TIMER_LOAD_VAL - __raw_readl(&cur_pit->cval1);
- /* increment tbu if tbl has rolled over */
- if (now < gd->arch.tbl)
- gd->arch.tbu++;
- gd->arch.tbl = now;
- return (((unsigned long long)gd->arch.tbu) << 32) | gd->arch.tbl;
- }
- ulong get_timer_masked(void)
- {
- return tick_to_time(get_ticks());
- }
- ulong get_timer(ulong base)
- {
- return get_timer_masked() - base;
- }
- /* delay x useconds AND preserve advance timstamp value */
- void __udelay(unsigned long usec)
- {
- unsigned long long start;
- ulong tmo;
- start = get_ticks(); /* get current timestamp */
- tmo = us_to_tick(usec); /* convert usecs to ticks */
- while ((get_ticks() - start) < tmo)
- ; /* loop till time has passed */
- }
- /*
- * 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 mxc_get_clock(MXC_IPG_CLK);
- }
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