linux-imx

/*

 * System timer for CSR SiRFprimaII

 *

 * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.

 *

 * Licensed under GPLv2 or later.

 */

​

#include <linux/kernel.h>

#include <linux/interrupt.h>

#include <linux/clockchips.h>

#include <linux/clocksource.h>

#include <linux/bitops.h>

#include <linux/irq.h>

#include <linux/clk.h>

#include <linux/err.h>

#include <linux/slab.h>

#include <linux/of.h>

#include <linux/of_irq.h>

#include <linux/of_address.h>

#include <linux/sched_clock.h>

​

#define PRIMA2_CLOCK_FREQ 1000000

​

#define SIRFSOC_TIMER_COUNTER_LO    0x0000

#define SIRFSOC_TIMER_COUNTER_HI    0x0004

#define SIRFSOC_TIMER_MATCH_0       0x0008

#define SIRFSOC_TIMER_MATCH_1       0x000C

#define SIRFSOC_TIMER_MATCH_2       0x0010

#define SIRFSOC_TIMER_MATCH_3       0x0014

#define SIRFSOC_TIMER_MATCH_4       0x0018

#define SIRFSOC_TIMER_MATCH_5       0x001C

#define SIRFSOC_TIMER_STATUS        0x0020

#define SIRFSOC_TIMER_INT_EN        0x0024

#define SIRFSOC_TIMER_WATCHDOG_EN   0x0028

#define SIRFSOC_TIMER_DIV       0x002C

#define SIRFSOC_TIMER_LATCH     0x0030

#define SIRFSOC_TIMER_LATCHED_LO    0x0034

#define SIRFSOC_TIMER_LATCHED_HI    0x0038

​

#define SIRFSOC_TIMER_WDT_INDEX     5

​

#define SIRFSOC_TIMER_LATCH_BIT  BIT(0)

​

#define SIRFSOC_TIMER_REG_CNT 11

​

static const u32 sirfsoc_timer_reg_list[SIRFSOC_TIMER_REG_CNT] = {

    SIRFSOC_TIMER_MATCH_0, SIRFSOC_TIMER_MATCH_1, SIRFSOC_TIMER_MATCH_2,

    SIRFSOC_TIMER_MATCH_3, SIRFSOC_TIMER_MATCH_4, SIRFSOC_TIMER_MATCH_5,

    SIRFSOC_TIMER_INT_EN, SIRFSOC_TIMER_WATCHDOG_EN, SIRFSOC_TIMER_DIV,

    SIRFSOC_TIMER_LATCHED_LO, SIRFSOC_TIMER_LATCHED_HI,

};

​

static u32 sirfsoc_timer_reg_val[SIRFSOC_TIMER_REG_CNT];

​

static void __iomem *sirfsoc_timer_base;

​

/* timer0 interrupt handler */

static irqreturn_t sirfsoc_timer_interrupt(int irq, void *dev_id)

{

    struct clock_event_device *ce = dev_id;

​

    WARN_ON(!(readl_relaxed(sirfsoc_timer_base + SIRFSOC_TIMER_STATUS) &