linux-imx

/*

 * Copyright (C) 2012 Broadcom Corporation

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License as

 * published by the Free Software Foundation version 2.

 *

 * This program is distributed "as is" WITHOUT ANY WARRANTY of any

 * kind, whether express or implied; without even the implied warranty

 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 */

​

#include <linux/init.h>

#include <linux/irq.h>

#include <linux/interrupt.h>

#include <linux/jiffies.h>

#include <linux/clockchips.h>

#include <linux/types.h>

#include <linux/clk.h>

​

#include <linux/io.h>

​

#include <linux/of.h>

#include <linux/of_address.h>

#include <linux/of_irq.h>

​

​

#define KONA_GPTIMER_STCS_OFFSET            0x00000000

#define KONA_GPTIMER_STCLO_OFFSET           0x00000004

#define KONA_GPTIMER_STCHI_OFFSET           0x00000008

#define KONA_GPTIMER_STCM0_OFFSET           0x0000000C

​

#define KONA_GPTIMER_STCS_TIMER_MATCH_SHIFT     0

#define KONA_GPTIMER_STCS_COMPARE_ENABLE_SHIFT      4

​

struct kona_bcm_timers {

    int tmr_irq;

    void __iomem *tmr_regs;

};

​

static struct kona_bcm_timers timers;

​

static u32 arch_timer_rate;

​

/*

 * We use the peripheral timers for system tick, the cpu global timer for

 * profile tick

 */

static void kona_timer_disable_and_clear(void __iomem *base)

{

    uint32_t reg;

​

    /*

     * clear and disable interrupts

     * We are using compare/match register 0 for our system interrupts

     */

    reg = readl(base + KONA_GPTIMER_STCS_OFFSET);

​

    /* Clear compare (0) interrupt */

    reg |= 1 << KONA_GPTIMER_STCS_TIMER_MATCH_SHIFT;

    /* disable compare */

    reg &= ~(1 << KONA_GPTIMER_STCS_COMPARE_ENABLE_SHIFT);