3 * Sascha Hauer, Pengutronix
5 * SPDX-License-Identifier: GPL-2.0+
9 #include <asm/arch/imx-regs.h>
12 #define TIMER_BASE 0x53f90000 /* General purpose timer 1 */
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 */
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 */
26 DECLARE_GLOBAL_DATA_PTR;
28 /* The 32768Hz 32-bit timer overruns in 131072 seconds */
33 /* setup GP Timer 1 */
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;
44 unsigned long timer_read_counter(void)