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![Yoshinori Sato](/assets/img/avatar_default.png)
h8300_timer8: 8bit clockevent device h8300_timer16 / h8300_tpu: 16bit clocksource Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>
254 lines
5.5 KiB
C
254 lines
5.5 KiB
C
/*
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* H8/300 16bit Timer driver
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*
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* Copyright 2015 Yoshinori Sato <ysato@users.sourcefoge.jp>
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*/
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#include <linux/errno.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/slab.h>
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#include <linux/interrupt.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/clocksource.h>
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#include <linux/module.h>
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#include <linux/clk.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <asm/segment.h>
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#include <asm/irq.h>
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#define TSTR 0
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#define TSNC 1
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#define TMDR 2
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#define TOLR 3
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#define TISRA 4
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#define TISRB 5
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#define TISRC 6
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#define TCR 0
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#define TIOR 1
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#define TCNT 2
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#define GRA 4
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#define GRB 6
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#define FLAG_REPROGRAM (1 << 0)
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#define FLAG_SKIPEVENT (1 << 1)
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#define FLAG_IRQCONTEXT (1 << 2)
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#define FLAG_STARTED (1 << 3)
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#define ONESHOT 0
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#define PERIODIC 1
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#define RELATIVE 0
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#define ABSOLUTE 1
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struct timer16_priv {
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struct platform_device *pdev;
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struct clocksource cs;
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struct irqaction irqaction;
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unsigned long total_cycles;
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unsigned long mapbase;
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unsigned long mapcommon;
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unsigned long flags;
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unsigned short gra;
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unsigned short cs_enabled;
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unsigned char enb;
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unsigned char imfa;
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unsigned char imiea;
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unsigned char ovf;
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raw_spinlock_t lock;
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struct clk *clk;
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};
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static unsigned long timer16_get_counter(struct timer16_priv *p)
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{
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unsigned long v1, v2, v3;
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int o1, o2;
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o1 = ctrl_inb(p->mapcommon + TISRC) & p->ovf;
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/* Make sure the timer value is stable. Stolen from acpi_pm.c */
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do {
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o2 = o1;
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v1 = ctrl_inw(p->mapbase + TCNT);
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v2 = ctrl_inw(p->mapbase + TCNT);
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v3 = ctrl_inw(p->mapbase + TCNT);
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o1 = ctrl_inb(p->mapcommon + TISRC) & p->ovf;
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} while (unlikely((o1 != o2) || (v1 > v2 && v1 < v3)
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|| (v2 > v3 && v2 < v1) || (v3 > v1 && v3 < v2)));
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v2 |= 0x10000;
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return v2;
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}
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static irqreturn_t timer16_interrupt(int irq, void *dev_id)
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{
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struct timer16_priv *p = (struct timer16_priv *)dev_id;
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ctrl_outb(ctrl_inb(p->mapcommon + TISRA) & ~p->imfa,
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p->mapcommon + TISRA);
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p->total_cycles += 0x10000;
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return IRQ_HANDLED;
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}
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static inline struct timer16_priv *cs_to_priv(struct clocksource *cs)
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{
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return container_of(cs, struct timer16_priv, cs);
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}
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static cycle_t timer16_clocksource_read(struct clocksource *cs)
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{
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struct timer16_priv *p = cs_to_priv(cs);
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unsigned long flags, raw;
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unsigned long value;
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raw_spin_lock_irqsave(&p->lock, flags);
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value = p->total_cycles;
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raw = timer16_get_counter(p);
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raw_spin_unlock_irqrestore(&p->lock, flags);
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return value + raw;
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}
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static int timer16_enable(struct clocksource *cs)
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{
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struct timer16_priv *p = cs_to_priv(cs);
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WARN_ON(p->cs_enabled);
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p->total_cycles = 0;
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ctrl_outw(0x0000, p->mapbase + TCNT);
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ctrl_outb(0x83, p->mapbase + TCR);
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ctrl_outb(ctrl_inb(p->mapcommon + TSTR) | p->enb,
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p->mapcommon + TSTR);
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p->cs_enabled = true;
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return 0;
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}
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static void timer16_disable(struct clocksource *cs)
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{
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struct timer16_priv *p = cs_to_priv(cs);
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WARN_ON(!p->cs_enabled);
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ctrl_outb(ctrl_inb(p->mapcommon + TSTR) & ~p->enb,
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p->mapcommon + TSTR);
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p->cs_enabled = false;
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}
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#define REG_CH 0
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#define REG_COMM 1
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static int timer16_setup(struct timer16_priv *p, struct platform_device *pdev)
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{
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struct resource *res[2];
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int ret, irq;
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unsigned int ch;
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memset(p, 0, sizeof(*p));
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p->pdev = pdev;
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res[REG_CH] = platform_get_resource(p->pdev,
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IORESOURCE_MEM, REG_CH);
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res[REG_COMM] = platform_get_resource(p->pdev,
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IORESOURCE_MEM, REG_COMM);
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if (!res[REG_CH] || !res[REG_COMM]) {
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dev_err(&p->pdev->dev, "failed to get I/O memory\n");
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return -ENXIO;
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}
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irq = platform_get_irq(p->pdev, 0);
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if (irq < 0) {
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dev_err(&p->pdev->dev, "failed to get irq\n");
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return irq;
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}
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p->clk = clk_get(&p->pdev->dev, "fck");
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if (IS_ERR(p->clk)) {
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dev_err(&p->pdev->dev, "can't get clk\n");
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return PTR_ERR(p->clk);
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}
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of_property_read_u32(p->pdev->dev.of_node, "renesas,channel", &ch);
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p->pdev = pdev;
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p->mapbase = res[REG_CH]->start;
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p->mapcommon = res[REG_COMM]->start;
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p->enb = 1 << ch;
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p->imfa = 1 << ch;
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p->imiea = 1 << (4 + ch);
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p->cs.name = pdev->name;
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p->cs.rating = 200;
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p->cs.read = timer16_clocksource_read;
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p->cs.enable = timer16_enable;
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p->cs.disable = timer16_disable;
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p->cs.mask = CLOCKSOURCE_MASK(sizeof(unsigned long) * 8);
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p->cs.flags = CLOCK_SOURCE_IS_CONTINUOUS;
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ret = request_irq(irq, timer16_interrupt,
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IRQF_TIMER, pdev->name, p);
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if (ret < 0) {
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dev_err(&p->pdev->dev, "failed to request irq %d\n", irq);
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return ret;
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}
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clocksource_register_hz(&p->cs, clk_get_rate(p->clk) / 8);
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return 0;
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}
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static int timer16_probe(struct platform_device *pdev)
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{
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struct timer16_priv *p = platform_get_drvdata(pdev);
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if (p) {
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dev_info(&pdev->dev, "kept as earlytimer\n");
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return 0;
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}
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p = devm_kzalloc(&pdev->dev, sizeof(*p), GFP_KERNEL);
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if (!p)
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return -ENOMEM;
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return timer16_setup(p, pdev);
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}
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static int timer16_remove(struct platform_device *pdev)
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{
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return -EBUSY;
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}
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static const struct of_device_id timer16_of_table[] = {
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{ .compatible = "renesas,16bit-timer" },
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{ }
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};
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static struct platform_driver timer16_driver = {
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.probe = timer16_probe,
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.remove = timer16_remove,
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.driver = {
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.name = "h8300h-16timer",
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.of_match_table = of_match_ptr(timer16_of_table),
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}
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};
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static int __init timer16_init(void)
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{
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return platform_driver_register(&timer16_driver);
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}
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static void __exit timer16_exit(void)
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{
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platform_driver_unregister(&timer16_driver);
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}
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subsys_initcall(timer16_init);
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module_exit(timer16_exit);
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MODULE_AUTHOR("Yoshinori Sato");
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MODULE_DESCRIPTION("H8/300H 16bit Timer Driver");
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MODULE_LICENSE("GPL v2");
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