| /* |
| * (C) Copyright 2007 |
| * Sascha Hauer, Pengutronix |
| * |
| * SPDX-License-Identifier: GPL-2.0+ |
| */ |
| |
| #include <common.h> |
| #include <asm/arch/imx-regs.h> |
| #include <asm/io.h> |
| |
| #define TIMER_BASE 0x53f90000 /* General purpose timer 1 */ |
| |
| /* General purpose timers registers */ |
| #define GPTCR __REG(TIMER_BASE) /* Control register */ |
| #define GPTPR __REG(TIMER_BASE + 0x4) /* Prescaler register */ |
| #define GPTSR __REG(TIMER_BASE + 0x8) /* Status register */ |
| #define GPTCNT __REG(TIMER_BASE + 0x24) /* Counter register */ |
| |
| /* General purpose timers bitfields */ |
| #define GPTCR_SWR (1 << 15) /* Software reset */ |
| #define GPTCR_FRR (1 << 9) /* Freerun / restart */ |
| #define GPTCR_CLKSOURCE_32 (4 << 6) /* Clock source */ |
| #define GPTCR_TEN 1 /* Timer enable */ |
| |
| DECLARE_GLOBAL_DATA_PTR; |
| |
| /* The 32768Hz 32-bit timer overruns in 131072 seconds */ |
| int timer_init(void) |
| { |
| int i; |
| |
| /* setup GP Timer 1 */ |
| GPTCR = GPTCR_SWR; |
| for (i = 0; i < 100; i++) |
| GPTCR = 0; /* We have no udelay by now */ |
| GPTPR = 0; /* 32Khz */ |
| /* Freerun Mode, PERCLK1 input */ |
| GPTCR |= GPTCR_CLKSOURCE_32 | GPTCR_TEN; |
| |
| return 0; |
| } |
| |
| unsigned long timer_read_counter(void) |
| { |
| return GPTCNT; |
| } |
