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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/h8300/kernel/timer/tpu.c
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/*

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 *  linux/arch/h8300/kernel/timer/tpu.c

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 *

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 *  Yoshinori Sato <[email protected]>

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 *

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 *  TPU Timer Handler

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 *

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 */

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#include <linux/errno.h>

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#include <linux/sched.h>

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#include <linux/kernel.h>

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#include <linux/param.h>

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#include <linux/string.h>

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#include <linux/mm.h>

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#include <linux/interrupt.h>

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#include <linux/init.h>

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#include <linux/timex.h>

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#include <asm/segment.h>

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#include <asm/io.h>

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#include <asm/irq.h>

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#include <asm/regs267x.h>

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/* TPU */

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#if CONFIG_H8300_TPU_CH == 0

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#define TPUBASE	0xffffd0

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#define TPUIRQ	40

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#elif CONFIG_H8300_TPU_CH == 1

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#define TPUBASE	0xffffe0

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#define TPUIRQ	48

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#elif CONFIG_H8300_TPU_CH == 2

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#define TPUBASE	0xfffff0

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#define TPUIRQ	52

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#elif CONFIG_H8300_TPU_CH == 3

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#define TPUBASE	0xfffe80

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#define TPUIRQ	56

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#elif CONFIG_H8300_TPU_CH == 4

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#define TPUBASE	0xfffe90

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#define TPUIRQ	64

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#else

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#error Unknown timer channel.

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#endif

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#define _TCR	0

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#define _TMDR	1

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#define _TIOR	2

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#define _TIER	4

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#define _TSR	5

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#define _TCNT	6

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#define _GRA	8

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#define _GRB	10

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#define CCLR0	0x20

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static irqreturn_t timer_interrupt(int irq, void *dev_id)

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{

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	h8300_timer_tick();

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	ctrl_bclr(0, TPUBASE + _TSR);

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	return IRQ_HANDLED;

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}

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static struct irqaction tpu_irq = {

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	.name		= "tpu",

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	.handler	= timer_interrupt,

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	.flags		= IRQF_DISABLED | IRQF_TIMER,

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};

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static const int __initdata divide_rate[] = {

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#if CONFIG_H8300_TPU_CH == 0

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	1,4,16,64,0,0,0,0,

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#elif (CONFIG_H8300_TPU_CH == 1) || (CONFIG_H8300_TPU_CH == 5)

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	1,4,16,64,0,0,256,0,

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#elif (CONFIG_H8300_TPU_CH == 2) || (CONFIG_H8300_TPU_CH == 4)

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	1,4,16,64,0,0,0,1024,

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#elif CONFIG_H8300_TPU_CH == 3

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	1,4,16,64,0,1024,256,4096,

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#endif

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};

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void __init h8300_timer_setup(void)

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{

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	unsigned int cnt;

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	unsigned int div;

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	calc_param(cnt, div, divide_rate, 0x10000);

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	setup_irq(TPUIRQ, &tpu_irq);

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	/* TPU module enabled */

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	ctrl_bclr(3, MSTPCRH);

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	ctrl_outb(0, TSTR);

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	ctrl_outb(CCLR0 | div, TPUBASE + _TCR);

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	ctrl_outb(0, TPUBASE + _TMDR);

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	ctrl_outw(0, TPUBASE + _TIOR);

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	ctrl_outb(0x01, TPUBASE + _TIER);

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	ctrl_outw(cnt, TPUBASE + _GRA);

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	ctrl_bset(CONFIG_H8300_TPU_CH, TSTR);

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}

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