3 * Sascha Hauer, Pengutronix
5 * See file CREDITS for list of people who contributed to this
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
25 #include <asm/arch/mx31-regs.h>
27 #define TIMER_BASE 0x53f90000 /* General purpose timer 1 */
29 /* General purpose timers registers */
30 #define GPTCR __REG(TIMER_BASE) /* Control register */
31 #define GPTPR __REG(TIMER_BASE + 0x4) /* Prescaler register */
32 #define GPTSR __REG(TIMER_BASE + 0x8) /* Status register */
33 #define GPTCNT __REG(TIMER_BASE + 0x24) /* Counter register */
35 /* General purpose timers bitfields */
36 #define GPTCR_SWR (1<<15) /* Software reset */
37 #define GPTCR_FRR (1<<9) /* Freerun / restart */
38 #define GPTCR_CLKSOURCE_32 (4<<6) /* Clock source */
39 #define GPTCR_TEN (1) /* Timer enable */
41 /* nothing really to do with interrupts, just starts up a counter. */
42 int interrupt_init (void)
46 /* setup GP Timer 1 */
48 for ( i=0; i<100; i++) GPTCR = 0; /* We have no udelay by now */
49 GPTPR = 0; /* 32Khz */
50 GPTCR |= GPTCR_CLKSOURCE_32 | GPTCR_TEN; /* Freerun Mode, PERCLK1 input */
55 void reset_timer_masked (void)
58 GPTCR = GPTCR_CLKSOURCE_32 | GPTCR_TEN; /* Freerun Mode, PERCLK1 input */
61 ulong get_timer_masked (void)
67 ulong get_timer (ulong base)
69 return get_timer_masked () - base;
72 void set_timer (ulong t)
76 /* delay x useconds AND perserve advance timstamp value */
77 void udelay (unsigned long usec)
81 if (usec >= 1000) { /* if "big" number, spread normalization to seconds */
82 tmo = usec / 1000; /* start to normalize for usec to ticks per sec */
83 tmo *= CFG_HZ; /* find number of "ticks" to wait to achieve target */
84 tmo /= 1000; /* finish normalize. */
85 } else { /* else small number, don't kill it prior to HZ multiply */
90 tmp = get_timer (0); /* get current timestamp */
91 if ( (tmo + tmp + 1) < tmp )/* if setting this forward will roll time stamp */
92 reset_timer_masked (); /* reset "advancing" timestamp to 0, set lastinc value */
94 tmo += tmp; /* else, set advancing stamp wake up time */
95 while (get_timer_masked () < tmo)/* loop till event */
99 void reset_cpu (ulong addr)
101 __REG16(WDOG_BASE) = 4;