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Stefano Babica521a772010-01-20 18:19:32 +01001/*
2 * (C) Copyright 2007
3 * Sascha Hauer, Pengutronix
4 *
5 * (C) Copyright 2009 Freescale Semiconductor, Inc.
6 *
7 * See file CREDITS for list of people who contributed to this
8 * project.
9 *
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.
14 *
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.
19 *
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,
23 * MA 02111-1307 USA
24 */
25
26#include <common.h>
27#include <asm/io.h>
28#include <asm/arch/imx-regs.h>
29
30/* General purpose timers registers */
31struct mxc_gpt {
32 unsigned int control;
33 unsigned int prescaler;
34 unsigned int status;
35 unsigned int nouse[6];
36 unsigned int counter;
37};
38
39static struct mxc_gpt *cur_gpt = (struct mxc_gpt *)GPT1_BASE_ADDR;
40
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 */
46
Stefano Babic19c53b42011-01-21 21:16:15 +010047DECLARE_GLOBAL_DATA_PTR;
48
49#define timestamp (gd->tbl)
50#define lastinc (gd->lastinc)
Stefano Babica521a772010-01-20 18:19:32 +010051
52int timer_init(void)
53{
54 int i;
55
56 /* setup GP Timer 1 */
57 __raw_writel(GPTCR_SWR, &cur_gpt->control);
58
59 /* We have no udelay by now */
60 for (i = 0; i < 100; i++)
61 __raw_writel(0, &cur_gpt->control);
62
63 __raw_writel(0, &cur_gpt->prescaler); /* 32Khz */
64
65 /* Freerun Mode, PERCLK1 input */
66 i = __raw_readl(&cur_gpt->control);
67 __raw_writel(i | GPTCR_CLKSOURCE_32 | GPTCR_TEN, &cur_gpt->control);
68 reset_timer_masked();
69 return 0;
70}
71
Stefano Babica521a772010-01-20 18:19:32 +010072void reset_timer_masked(void)
73{
74 ulong val = __raw_readl(&cur_gpt->counter);
Jason Liue7a7ed22010-10-18 11:09:26 +080075 lastinc = val / (CONFIG_SYS_MX5_CLK32 / CONFIG_SYS_HZ);
Stefano Babica521a772010-01-20 18:19:32 +010076 timestamp = 0;
77}
78
79ulong get_timer_masked(void)
80{
81 ulong val = __raw_readl(&cur_gpt->counter);
Jason Liue7a7ed22010-10-18 11:09:26 +080082 val /= (CONFIG_SYS_MX5_CLK32 / CONFIG_SYS_HZ);
Stefano Babica521a772010-01-20 18:19:32 +010083 if (val >= lastinc)
84 timestamp += (val - lastinc);
85 else
Jason Liue7a7ed22010-10-18 11:09:26 +080086 timestamp += ((0xFFFFFFFF / (CONFIG_SYS_MX5_CLK32 / CONFIG_SYS_HZ))
Stefano Babica521a772010-01-20 18:19:32 +010087 - lastinc) + val;
88 lastinc = val;
Li Haibocfdda9e2010-08-10 14:18:38 +080089 return timestamp;
Stefano Babica521a772010-01-20 18:19:32 +010090}
91
92ulong get_timer(ulong base)
93{
94 return get_timer_masked() - base;
95}
96
Wolfgang Denkd7cb3552010-05-21 23:13:18 +020097/* delay x useconds AND preserve advance timestamp value */
Stefano Babica521a772010-01-20 18:19:32 +010098void __udelay(unsigned long usec)
99{
100 unsigned long now, start, tmo;
Jason Liue7a7ed22010-10-18 11:09:26 +0800101 tmo = usec * (CONFIG_SYS_MX5_CLK32 / 1000) / 1000;
Stefano Babica521a772010-01-20 18:19:32 +0100102
103 if (!tmo)
104 tmo = 1;
105
106 now = start = readl(&cur_gpt->counter);
107
108 while ((now - start) < tmo)
109 now = readl(&cur_gpt->counter);
110
111}