1 /* 2 * (C) Copyright 2007 3 * Sascha Hauer, Pengutronix 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 #include <common.h> 9 #include <asm/arch/imx-regs.h> 10 #include <asm/io.h> 11 12 #define TIMER_BASE 0x53f90000 /* General purpose timer 1 */ 13 14 /* General purpose timers registers */ 15 #define GPTCR __REG(TIMER_BASE) /* Control register */ 16 #define GPTPR __REG(TIMER_BASE + 0x4) /* Prescaler register */ 17 #define GPTSR __REG(TIMER_BASE + 0x8) /* Status register */ 18 #define GPTCNT __REG(TIMER_BASE + 0x24) /* Counter register */ 19 20 /* General purpose timers bitfields */ 21 #define GPTCR_SWR (1 << 15) /* Software reset */ 22 #define GPTCR_FRR (1 << 9) /* Freerun / restart */ 23 #define GPTCR_CLKSOURCE_32 (4 << 6) /* Clock source */ 24 #define GPTCR_TEN 1 /* Timer enable */ 25 26 DECLARE_GLOBAL_DATA_PTR; 27 28 /* The 32768Hz 32-bit timer overruns in 131072 seconds */ 29 int timer_init(void) 30 { 31 int i; 32 33 /* setup GP Timer 1 */ 34 GPTCR = GPTCR_SWR; 35 for (i = 0; i < 100; i++) 36 GPTCR = 0; /* We have no udelay by now */ 37 GPTPR = 0; /* 32Khz */ 38 /* Freerun Mode, PERCLK1 input */ 39 GPTCR |= GPTCR_CLKSOURCE_32 | GPTCR_TEN; 40 41 return 0; 42 } 43 44 unsigned long timer_read_counter(void) 45 { 46 return GPTCNT; 47 } 48