| // SPDX-License-Identifier: GPL-2.0+ |
| /* |
| * (C) Copyright 2002 |
| * Sysgo Real-Time Solutions, GmbH <www.elinos.com> |
| * Marius Groeger <mgroeger@sysgo.de> |
| * |
| * (C) Copyright 2002 |
| * Sysgo Real-Time Solutions, GmbH <www.elinos.com> |
| * Alex Zuepke <azu@sysgo.de> |
| * |
| * (C) Copyright 2002 |
| * Gary Jennejohn, DENX Software Engineering, <gj@denx.de> |
| * |
| * (C) Copyright 2009 |
| * Ilya Yanok, Emcraft Systems Ltd, <yanok@emcraft.com> |
| * |
| * (C) Copyright 2009 DENX Software Engineering |
| * Author: John Rigby <jrigby@gmail.com> |
| * Add support for MX25 |
| */ |
| |
| #include <common.h> |
| #include <asm/io.h> |
| #include <asm/arch/imx-regs.h> |
| |
| /* nothing really to do with interrupts, just starts up a counter. */ |
| /* The 32KHz 32-bit timer overruns in 134217 seconds */ |
| int timer_init(void) |
| { |
| int i; |
| struct gpt_regs *gpt = (struct gpt_regs *)IMX_GPT1_BASE; |
| struct ccm_regs *ccm = (struct ccm_regs *)IMX_CCM_BASE; |
| |
| /* setup GP Timer 1 */ |
| writel(GPT_CTRL_SWR, &gpt->ctrl); |
| |
| writel(readl(&ccm->cgr1) | CCM_CGR1_GPT1, &ccm->cgr1); |
| |
| for (i = 0; i < 100; i++) |
| writel(0, &gpt->ctrl); /* We have no udelay by now */ |
| writel(0, &gpt->pre); /* prescaler = 1 */ |
| /* Freerun Mode, 32KHz input */ |
| writel(readl(&gpt->ctrl) | GPT_CTRL_CLKSOURCE_32 | GPT_CTRL_FRR, |
| &gpt->ctrl); |
| writel(readl(&gpt->ctrl) | GPT_CTRL_TEN, &gpt->ctrl); |
| |
| return 0; |
| } |
