linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 *  linux/arch/h8300/kernel/cpu/timer/timer8.c

 *

 *  Yoshinori Sato <ysato@users.sourcefoge.jp>

 *

 *  8bit Timer driver

 *

 */

​

#include <linux/errno.h>

#include <linux/kernel.h>

#include <linux/interrupt.h>

#include <linux/init.h>

#include <linux/clockchips.h>

#include <linux/clk.h>

#include <linux/io.h>

#include <linux/of.h>

#include <linux/of_address.h>

#include <linux/of_irq.h>

​

#define _8TCR   0

#define _8TCSR  2

#define TCORA   4

#define TCORB   6

#define _8TCNT  8

​

#define CMIEA   6

#define CMFA    6

​

#define FLAG_STARTED (1 << 3)

​

#define SCALE 64

​

#define bset(b, a) iowrite8(ioread8(a) | (1 << (b)), (a))

#define bclr(b, a) iowrite8(ioread8(a) & ~(1 << (b)), (a))

​

struct timer8_priv {

    struct clock_event_device ced;

    void __iomem *mapbase;

    unsigned long flags;

    unsigned int rate;

};

​

static irqreturn_t timer8_interrupt(int irq, void *dev_id)

{

    struct timer8_priv *p = dev_id;

​

    if (clockevent_state_oneshot(&p->ced))

        iowrite16be(0x0000, p->mapbase + _8TCR);

​

    p->ced.event_handler(&p->ced);

​

    bclr(CMFA, p->mapbase + _8TCSR);

​

    return IRQ_HANDLED;

}

​

static void timer8_set_next(struct timer8_priv *p, unsigned long delta)

{

    if (delta >= 0x10000)

        pr_warn("delta out of range\n");

    bclr(CMIEA, p->mapbase + _8TCR);