diff options
Diffstat (limited to 'roms/u-boot/arch/arm/cpu/arm926ejs/mx25/timer.c')
| -rw-r--r-- | roms/u-boot/arch/arm/cpu/arm926ejs/mx25/timer.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/roms/u-boot/arch/arm/cpu/arm926ejs/mx25/timer.c b/roms/u-boot/arch/arm/cpu/arm926ejs/mx25/timer.c new file mode 100644 index 000000000..4b726d5c7 --- /dev/null +++ b/roms/u-boot/arch/arm/cpu/arm926ejs/mx25/timer.c @@ -0,0 +1,50 @@ +// 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 <init.h> +#include <asm/io.h> +#include <asm/arch/imx-regs.h> +#include <asm/ptrace.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; +} |