* Copyright 2015 Yoshinori Sato <ysato@users.sourcefoge.jp>
*/
-#include <linux/errno.h>
-#include <linux/kernel.h>
-#include <linux/param.h>
-#include <linux/string.h>
-#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/init.h>
-#include <linux/platform_device.h>
#include <linux/clocksource.h>
-#include <linux/module.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/of.h>
-
-#include <asm/segment.h>
-#include <asm/irq.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
#define TSTR 0
-#define TSNC 1
-#define TMDR 2
-#define TOLR 3
-#define TISRA 4
-#define TISRB 5
#define TISRC 6
#define TCR 0
-#define TIOR 1
#define TCNT 2
-#define GRA 4
-#define GRB 6
-
-#define FLAG_REPROGRAM (1 << 0)
-#define FLAG_SKIPEVENT (1 << 1)
-#define FLAG_IRQCONTEXT (1 << 2)
-#define FLAG_STARTED (1 << 3)
-#define ONESHOT 0
-#define PERIODIC 1
-
-#define RELATIVE 0
-#define ABSOLUTE 1
+#define bset(b, a) iowrite8(ioread8(a) | (1 << (b)), (a))
+#define bclr(b, a) iowrite8(ioread8(a) & ~(1 << (b)), (a))
struct timer16_priv {
- struct platform_device *pdev;
struct clocksource cs;
- struct irqaction irqaction;
unsigned long total_cycles;
- unsigned long mapbase;
- unsigned long mapcommon;
- unsigned long flags;
- unsigned short gra;
+ void __iomem *mapbase;
+ void __iomem *mapcommon;
unsigned short cs_enabled;
unsigned char enb;
- unsigned char imfa;
- unsigned char imiea;
unsigned char ovf;
- raw_spinlock_t lock;
- struct clk *clk;
+ unsigned char ovie;
};
static unsigned long timer16_get_counter(struct timer16_priv *p)
{
- unsigned long v1, v2, v3;
- int o1, o2;
+ unsigned short v1, v2, v3;
+ unsigned char o1, o2;
- o1 = ctrl_inb(p->mapcommon + TISRC) & p->ovf;
+ o1 = ioread8(p->mapcommon + TISRC) & p->ovf;
/* Make sure the timer value is stable. Stolen from acpi_pm.c */
do {
o2 = o1;
- v1 = ctrl_inw(p->mapbase + TCNT);
- v2 = ctrl_inw(p->mapbase + TCNT);
- v3 = ctrl_inw(p->mapbase + TCNT);
- o1 = ctrl_inb(p->mapcommon + TISRC) & p->ovf;
+ v1 = ioread16be(p->mapbase + TCNT);
+ v2 = ioread16be(p->mapbase + TCNT);
+ v3 = ioread16be(p->mapbase + TCNT);
+ o1 = ioread8(p->mapcommon + TISRC) & p->ovf;
} while (unlikely((o1 != o2) || (v1 > v2 && v1 < v3)
|| (v2 > v3 && v2 < v1) || (v3 > v1 && v3 < v2)));
- v2 |= 0x10000;
- return v2;
+ if (likely(!o1))
+ return v2;
+ else
+ return v2 + 0x10000;
}
{
struct timer16_priv *p = (struct timer16_priv *)dev_id;
- ctrl_outb(ctrl_inb(p->mapcommon + TISRA) & ~p->imfa,
- p->mapcommon + TISRA);
+ bclr(p->ovf, p->mapcommon + TISRC);
p->total_cycles += 0x10000;
return IRQ_HANDLED;
static cycle_t timer16_clocksource_read(struct clocksource *cs)
{
struct timer16_priv *p = cs_to_priv(cs);
- unsigned long flags, raw;
- unsigned long value;
+ unsigned long raw, value;
- raw_spin_lock_irqsave(&p->lock, flags);
value = p->total_cycles;
raw = timer16_get_counter(p);
- raw_spin_unlock_irqrestore(&p->lock, flags);
return value + raw;
}
WARN_ON(p->cs_enabled);
p->total_cycles = 0;
- ctrl_outw(0x0000, p->mapbase + TCNT);
- ctrl_outb(0x83, p->mapbase + TCR);
- ctrl_outb(ctrl_inb(p->mapcommon + TSTR) | p->enb,
- p->mapcommon + TSTR);
+ iowrite16be(0x0000, p->mapbase + TCNT);
+ iowrite8(0x83, p->mapbase + TCR);
+ bset(p->ovie, p->mapcommon + TISRC);
+ bset(p->enb, p->mapcommon + TSTR);
p->cs_enabled = true;
return 0;
WARN_ON(!p->cs_enabled);
- ctrl_outb(ctrl_inb(p->mapcommon + TSTR) & ~p->enb,
- p->mapcommon + TSTR);
+ bclr(p->ovie, p->mapcommon + TISRC);
+ bclr(p->enb, p->mapcommon + TSTR);
p->cs_enabled = false;
}
+static struct timer16_priv timer16_priv = {
+ .cs = {
+ .name = "h8300_16timer",
+ .rating = 200,
+ .read = timer16_clocksource_read,
+ .enable = timer16_enable,
+ .disable = timer16_disable,
+ .mask = CLOCKSOURCE_MASK(sizeof(unsigned long) * 8),
+ .flags = CLOCK_SOURCE_IS_CONTINUOUS,
+ },
+};
+
#define REG_CH 0
#define REG_COMM 1
-static int timer16_setup(struct timer16_priv *p, struct platform_device *pdev)
+static void __init h8300_16timer_init(struct device_node *node)
{
- struct resource *res[2];
+ void __iomem *base[2];
int ret, irq;
unsigned int ch;
+ struct clk *clk;
- p->pdev = pdev;
-
- res[REG_CH] = platform_get_resource(p->pdev,
- IORESOURCE_MEM, REG_CH);
- res[REG_COMM] = platform_get_resource(p->pdev,
- IORESOURCE_MEM, REG_COMM);
- if (!res[REG_CH] || !res[REG_COMM]) {
- dev_err(&p->pdev->dev, "failed to get I/O memory\n");
- return -ENXIO;
- }
- irq = platform_get_irq(p->pdev, 0);
- if (irq < 0) {
- dev_err(&p->pdev->dev, "failed to get irq\n");
- return irq;
+ clk = of_clk_get(node, 0);
+ if (IS_ERR(clk)) {
+ pr_err("failed to get clock for clocksource\n");
+ return;
}
- p->clk = clk_get(&p->pdev->dev, "fck");
- if (IS_ERR(p->clk)) {
- dev_err(&p->pdev->dev, "can't get clk\n");
- return PTR_ERR(p->clk);
+ base[REG_CH] = of_iomap(node, 0);
+ if (!base[REG_CH]) {
+ pr_err("failed to map registers for clocksource\n");
+ goto free_clk;
}
- of_property_read_u32(p->pdev->dev.of_node, "renesas,channel", &ch);
-
- p->pdev = pdev;
- p->mapbase = res[REG_CH]->start;
- p->mapcommon = res[REG_COMM]->start;
- p->enb = 1 << ch;
- p->imfa = 1 << ch;
- p->imiea = 1 << (4 + ch);
- p->cs.name = pdev->name;
- p->cs.rating = 200;
- p->cs.read = timer16_clocksource_read;
- p->cs.enable = timer16_enable;
- p->cs.disable = timer16_disable;
- p->cs.mask = CLOCKSOURCE_MASK(sizeof(unsigned long) * 8);
- p->cs.flags = CLOCK_SOURCE_IS_CONTINUOUS;
- ret = request_irq(irq, timer16_interrupt,
- IRQF_TIMER, pdev->name, p);
- if (ret < 0) {
- dev_err(&p->pdev->dev, "failed to request irq %d\n", irq);
- return ret;
+ base[REG_COMM] = of_iomap(node, 1);
+ if (!base[REG_COMM]) {
+ pr_err("failed to map registers for clocksource\n");
+ goto unmap_ch;
}
- clocksource_register_hz(&p->cs, clk_get_rate(p->clk) / 8);
-
- return 0;
-}
-
-static int timer16_probe(struct platform_device *pdev)
-{
- struct timer16_priv *p = platform_get_drvdata(pdev);
-
- if (p) {
- dev_info(&pdev->dev, "kept as earlytimer\n");
- return 0;
+ irq = irq_of_parse_and_map(node, 0);
+ if (!irq) {
+ pr_err("failed to get irq for clockevent\n");
+ goto unmap_comm;
}
- p = devm_kzalloc(&pdev->dev, sizeof(*p), GFP_KERNEL);
- if (!p)
- return -ENOMEM;
+ of_property_read_u32(node, "renesas,channel", &ch);
- return timer16_setup(p, pdev);
-}
-
-static int timer16_remove(struct platform_device *pdev)
-{
- return -EBUSY;
-}
+ timer16_priv.mapbase = base[REG_CH];
+ timer16_priv.mapcommon = base[REG_COMM];
+ timer16_priv.enb = ch;
+ timer16_priv.ovf = ch;
+ timer16_priv.ovie = 4 + ch;
-static const struct of_device_id timer16_of_table[] = {
- { .compatible = "renesas,16bit-timer" },
- { }
-};
-static struct platform_driver timer16_driver = {
- .probe = timer16_probe,
- .remove = timer16_remove,
- .driver = {
- .name = "h8300h-16timer",
- .of_match_table = of_match_ptr(timer16_of_table),
+ ret = request_irq(irq, timer16_interrupt,
+ IRQF_TIMER, timer16_priv.cs.name, &timer16_priv);
+ if (ret < 0) {
+ pr_err("failed to request irq %d of clocksource\n", irq);
+ goto unmap_comm;
}
-};
-static int __init timer16_init(void)
-{
- return platform_driver_register(&timer16_driver);
-}
+ clocksource_register_hz(&timer16_priv.cs,
+ clk_get_rate(clk) / 8);
+ return;
-static void __exit timer16_exit(void)
-{
- platform_driver_unregister(&timer16_driver);
+unmap_comm:
+ iounmap(base[REG_COMM]);
+unmap_ch:
+ iounmap(base[REG_CH]);
+free_clk:
+ clk_put(clk);
}
-subsys_initcall(timer16_init);
-module_exit(timer16_exit);
-MODULE_AUTHOR("Yoshinori Sato");
-MODULE_DESCRIPTION("H8/300H 16bit Timer Driver");
-MODULE_LICENSE("GPL v2");
+CLOCKSOURCE_OF_DECLARE(h8300_16bit, "renesas,16bit-timer", h8300_16timer_init);
projects / deliverable / linux.git / blobdiff