1 files changed, 78 insertions, 144 deletions

diff --git a/drivers/clocksource/h8300_timer16.c b/drivers/clocksource/h8300_timer16.c
index 0e076c6fc006..75c44079b345 100644
--- a/drivers/clocksource/h8300_timer16.c
+++ b/drivers/clocksource/h8300_timer16.c
@@ -4,85 +4,56 @@
  *  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;
 }
 
 
@@ -90,8 +61,7 @@ static irqreturn_t timer16_interrupt(int irq, void *dev_id)
 {
 	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;
@@ -105,13 +75,10 @@ static inline struct timer16_priv *cs_to_priv(struct clocksource *cs)
 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;
 }
@@ -123,10 +90,10 @@ static int timer16_enable(struct clocksource *cs)
 	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;
@@ -138,116 +105,83 @@ static void timer16_disable(struct clocksource *cs)
 
 	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);