1 // SPDX-License-Identifier: GPL-2.0+
4 * Sascha Hauer, Pengutronix
8 #include <asm/arch/imx-regs.h>
11 #define TIMER_BASE 0x53f90000 /* General purpose timer 1 */
13 /* General purpose timers registers */
14 #define GPTCR __REG(TIMER_BASE) /* Control register */
15 #define GPTPR __REG(TIMER_BASE + 0x4) /* Prescaler register */
16 #define GPTSR __REG(TIMER_BASE + 0x8) /* Status register */
17 #define GPTCNT __REG(TIMER_BASE + 0x24) /* Counter register */
19 /* General purpose timers bitfields */
20 #define GPTCR_SWR (1 << 15) /* Software reset */
21 #define GPTCR_FRR (1 << 9) /* Freerun / restart */
22 #define GPTCR_CLKSOURCE_32 (4 << 6) /* Clock source */
23 #define GPTCR_TEN 1 /* Timer enable */
25 /* The 32768Hz 32-bit timer overruns in 131072 seconds */
30 /* setup GP Timer 1 */
32 for (i = 0; i < 100; i++)
33 GPTCR = 0; /* We have no udelay by now */
34 GPTPR = 0; /* 32Khz */
35 /* Freerun Mode, PERCLK1 input */
36 GPTCR |= GPTCR_CLKSOURCE_32 | GPTCR_TEN;
41 unsigned long timer_read_counter(void)