3 * Sascha Hauer, Pengutronix
5 * (C) Copyright 2009 Freescale Semiconductor, Inc.
7 * See file CREDITS for list of people who contributed to this
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License as
12 * published by the Free Software Foundation; either version 2 of
13 * the License, or (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
28 #include <asm/arch/imx-regs.h>
30 /* General purpose timers registers */
33 unsigned int prescaler;
35 unsigned int nouse[6];
39 static struct mxc_gpt *cur_gpt = (struct mxc_gpt *)GPT1_BASE_ADDR;
41 /* General purpose timers bitfields */
42 #define GPTCR_SWR (1<<15) /* Software reset */
43 #define GPTCR_FRR (1<<9) /* Freerun / restart */
44 #define GPTCR_CLKSOURCE_32 (4<<6) /* Clock source */
45 #define GPTCR_TEN (1) /* Timer enable */
47 DECLARE_GLOBAL_DATA_PTR;
49 #define timestamp (gd->tbl)
50 #define lastinc (gd->lastinc)
56 /* setup GP Timer 1 */
57 __raw_writel(GPTCR_SWR, &cur_gpt->control);
59 /* We have no udelay by now */
60 for (i = 0; i < 100; i++)
61 __raw_writel(0, &cur_gpt->control);
63 __raw_writel(0, &cur_gpt->prescaler); /* 32Khz */
65 /* Freerun Mode, PERCLK1 input */
66 i = __raw_readl(&cur_gpt->control);
67 __raw_writel(i | GPTCR_CLKSOURCE_32 | GPTCR_TEN, &cur_gpt->control);
72 void reset_timer(void)
77 void reset_timer_masked(void)
79 ulong val = __raw_readl(&cur_gpt->counter);
80 lastinc = val / (CONFIG_SYS_MX5_CLK32 / CONFIG_SYS_HZ);
84 ulong get_timer_masked(void)
86 ulong val = __raw_readl(&cur_gpt->counter);
87 val /= (CONFIG_SYS_MX5_CLK32 / CONFIG_SYS_HZ);
89 timestamp += (val - lastinc);
91 timestamp += ((0xFFFFFFFF / (CONFIG_SYS_MX5_CLK32 / CONFIG_SYS_HZ))
97 ulong get_timer(ulong base)
99 return get_timer_masked() - base;
102 void set_timer(ulong t)
107 /* delay x useconds AND preserve advance timestamp value */
108 void __udelay(unsigned long usec)
110 unsigned long now, start, tmo;
111 tmo = usec * (CONFIG_SYS_MX5_CLK32 / 1000) / 1000;
116 now = start = readl(&cur_gpt->counter);
118 while ((now - start) < tmo)
119 now = readl(&cur_gpt->counter);