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path: root/drivers/clocksource/h8300_timer8.c
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Diffstat (limited to 'drivers/clocksource/h8300_timer8.c')
-rw-r--r--drivers/clocksource/h8300_timer8.c264
1 files changed, 81 insertions, 183 deletions
diff --git a/drivers/clocksource/h8300_timer8.c b/drivers/clocksource/h8300_timer8.c
index 44375d8b9..c151941e1 100644
--- a/drivers/clocksource/h8300_timer8.c
+++ b/drivers/clocksource/h8300_timer8.c
@@ -8,19 +8,15 @@
*/
#include <linux/errno.h>
-#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/init.h>
-#include <linux/platform_device.h>
-#include <linux/slab.h>
#include <linux/clockchips.h>
-#include <linux/module.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/of.h>
-
-#include <asm/irq.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
#define _8TCR 0
#define _8TCSR 2
@@ -28,126 +24,74 @@
#define TCORB 6
#define _8TCNT 8
-#define FLAG_REPROGRAM (1 << 0)
-#define FLAG_SKIPEVENT (1 << 1)
-#define FLAG_IRQCONTEXT (1 << 2)
+#define CMIEA 6
+#define CMFA 6
+
#define FLAG_STARTED (1 << 3)
-#define ONESHOT 0
-#define PERIODIC 1
+#define SCALE 64
-#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 timer8_priv {
- struct platform_device *pdev;
struct clock_event_device ced;
- struct irqaction irqaction;
- unsigned long mapbase;
- raw_spinlock_t lock;
+ void __iomem *mapbase;
unsigned long flags;
unsigned int rate;
- unsigned int tcora;
- struct clk *pclk;
};
-static unsigned long timer8_get_counter(struct timer8_priv *p)
-{
- unsigned long v1, v2, v3;
- int o1, o2;
-
- o1 = ctrl_inb(p->mapbase + _8TCSR) & 0x20;
-
- /* Make sure the timer value is stable. Stolen from acpi_pm.c */
- do {
- o2 = o1;
- v1 = ctrl_inw(p->mapbase + _8TCNT);
- v2 = ctrl_inw(p->mapbase + _8TCNT);
- v3 = ctrl_inw(p->mapbase + _8TCNT);
- o1 = ctrl_inb(p->mapbase + _8TCSR) & 0x20;
- } while (unlikely((o1 != o2) || (v1 > v2 && v1 < v3)
- || (v2 > v3 && v2 < v1) || (v3 > v1 && v3 < v2)));
-
- v2 |= o1 << 10;
- return v2;
-}
-
static irqreturn_t timer8_interrupt(int irq, void *dev_id)
{
struct timer8_priv *p = dev_id;
- ctrl_outb(ctrl_inb(p->mapbase + _8TCSR) & ~0x40,
- p->mapbase + _8TCSR);
- p->flags |= FLAG_IRQCONTEXT;
- ctrl_outw(p->tcora, p->mapbase + TCORA);
- if (!(p->flags & FLAG_SKIPEVENT)) {
- if (clockevent_state_oneshot(&p->ced))
- ctrl_outw(0x0000, p->mapbase + _8TCR);
- p->ced.event_handler(&p->ced);
- }
- p->flags &= ~(FLAG_SKIPEVENT | FLAG_IRQCONTEXT);
+ 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)
{
- unsigned long flags;
- unsigned long now;
-
- raw_spin_lock_irqsave(&p->lock, flags);
if (delta >= 0x10000)
- dev_warn(&p->pdev->dev, "delta out of range\n");
- now = timer8_get_counter(p);
- p->tcora = delta;
- ctrl_outb(ctrl_inb(p->mapbase + _8TCR) | 0x40, p->mapbase + _8TCR);
- if (delta > now)
- ctrl_outw(delta, p->mapbase + TCORA);
- else
- ctrl_outw(now + 1, p->mapbase + TCORA);
-
- raw_spin_unlock_irqrestore(&p->lock, flags);
+ pr_warn("delta out of range\n");
+ bclr(CMIEA, p->mapbase + _8TCR);
+ iowrite16be(delta, p->mapbase + TCORA);
+ iowrite16be(0x0000, p->mapbase + _8TCNT);
+ bclr(CMFA, p->mapbase + _8TCSR);
+ bset(CMIEA, p->mapbase + _8TCR);
}
static int timer8_enable(struct timer8_priv *p)
{
- p->rate = clk_get_rate(p->pclk) / 64;
- ctrl_outw(0xffff, p->mapbase + TCORA);
- ctrl_outw(0x0000, p->mapbase + _8TCNT);
- ctrl_outw(0x0c02, p->mapbase + _8TCR);
+ iowrite16be(0xffff, p->mapbase + TCORA);
+ iowrite16be(0x0000, p->mapbase + _8TCNT);
+ iowrite16be(0x0c02, p->mapbase + _8TCR);
return 0;
}
static int timer8_start(struct timer8_priv *p)
{
- int ret = 0;
- unsigned long flags;
-
- raw_spin_lock_irqsave(&p->lock, flags);
-
- if (!(p->flags & FLAG_STARTED))
- ret = timer8_enable(p);
+ int ret;
- if (ret)
- goto out;
- p->flags |= FLAG_STARTED;
+ if ((p->flags & FLAG_STARTED))
+ return 0;
- out:
- raw_spin_unlock_irqrestore(&p->lock, flags);
+ ret = timer8_enable(p);
+ if (!ret)
+ p->flags |= FLAG_STARTED;
return ret;
}
static void timer8_stop(struct timer8_priv *p)
{
- unsigned long flags;
-
- raw_spin_lock_irqsave(&p->lock, flags);
-
- ctrl_outw(0x0000, p->mapbase + _8TCR);
-
- raw_spin_unlock_irqrestore(&p->lock, flags);
+ iowrite16be(0x0000, p->mapbase + _8TCR);
}
static inline struct timer8_priv *ced_to_priv(struct clock_event_device *ced)
@@ -155,7 +99,7 @@ static inline struct timer8_priv *ced_to_priv(struct clock_event_device *ced)
return container_of(ced, struct timer8_priv, ced);
}
-static void timer8_clock_event_start(struct timer8_priv *p, int periodic)
+static void timer8_clock_event_start(struct timer8_priv *p, unsigned long delta)
{
struct clock_event_device *ced = &p->ced;
@@ -166,7 +110,7 @@ static void timer8_clock_event_start(struct timer8_priv *p, int periodic)
ced->max_delta_ns = clockevent_delta2ns(0xffff, ced);
ced->min_delta_ns = clockevent_delta2ns(0x0001, ced);
- timer8_set_next(p, periodic?(p->rate + HZ/2) / HZ:0x10000);
+ timer8_set_next(p, delta);
}
static int timer8_clock_event_shutdown(struct clock_event_device *ced)
@@ -179,9 +123,9 @@ static int timer8_clock_event_periodic(struct clock_event_device *ced)
{
struct timer8_priv *p = ced_to_priv(ced);
- dev_info(&p->pdev->dev, "used for periodic clock events\n");
+ pr_info("%s: used for periodic clock events\n", ced->name);
timer8_stop(p);
- timer8_clock_event_start(p, PERIODIC);
+ timer8_clock_event_start(p, (p->rate + HZ/2) / HZ);
return 0;
}
@@ -190,9 +134,9 @@ static int timer8_clock_event_oneshot(struct clock_event_device *ced)
{
struct timer8_priv *p = ced_to_priv(ced);
- dev_info(&p->pdev->dev, "used for oneshot clock events\n");
+ pr_info("%s: used for oneshot clock events\n", ced->name);
timer8_stop(p);
- timer8_clock_event_start(p, ONESHOT);
+ timer8_clock_event_start(p, 0x10000);
return 0;
}
@@ -208,110 +152,64 @@ static int timer8_clock_event_next(unsigned long delta,
return 0;
}
-static int timer8_setup(struct timer8_priv *p,
- struct platform_device *pdev)
+static struct timer8_priv timer8_priv = {
+ .ced = {
+ .name = "h8300_8timer",
+ .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
+ .rating = 200,
+ .set_next_event = timer8_clock_event_next,
+ .set_state_shutdown = timer8_clock_event_shutdown,
+ .set_state_periodic = timer8_clock_event_periodic,
+ .set_state_oneshot = timer8_clock_event_oneshot,
+ },
+};
+
+static void __init h8300_8timer_init(struct device_node *node)
{
- struct resource *res;
+ void __iomem *base;
int irq;
- int ret;
+ struct clk *clk;
- p->pdev = pdev;
-
- res = platform_get_resource(p->pdev, IORESOURCE_MEM, 0);
- if (!res) {
- dev_err(&p->pdev->dev, "failed to get I/O memory\n");
- return -ENXIO;
+ clk = of_clk_get(node, 0);
+ if (IS_ERR(clk)) {
+ pr_err("failed to get clock for clockevent\n");
+ return;
}
- irq = platform_get_irq(p->pdev, 0);
- if (irq < 0) {
- dev_err(&p->pdev->dev, "failed to get irq\n");
- return -ENXIO;
+ base = of_iomap(node, 0);
+ if (!base) {
+ pr_err("failed to map registers for clockevent\n");
+ goto free_clk;
}
- p->mapbase = res->start;
-
- p->irqaction.name = dev_name(&p->pdev->dev);
- p->irqaction.handler = timer8_interrupt;
- p->irqaction.dev_id = p;
- p->irqaction.flags = IRQF_TIMER;
-
- p->pclk = clk_get(&p->pdev->dev, "fck");
- if (IS_ERR(p->pclk)) {
- dev_err(&p->pdev->dev, "can't get clk\n");
- return PTR_ERR(p->pclk);
+ irq = irq_of_parse_and_map(node, 0);
+ if (!irq) {
+ pr_err("failed to get irq for clockevent\n");
+ goto unmap_reg;
}
- p->ced.name = pdev->name;
- p->ced.features = CLOCK_EVT_FEAT_PERIODIC |
- CLOCK_EVT_FEAT_ONESHOT;
- p->ced.rating = 200;
- p->ced.cpumask = cpumask_of(0);
- p->ced.set_next_event = timer8_clock_event_next;
- p->ced.set_state_shutdown = timer8_clock_event_shutdown;
- p->ced.set_state_periodic = timer8_clock_event_periodic;
- p->ced.set_state_oneshot = timer8_clock_event_oneshot;
-
- ret = setup_irq(irq, &p->irqaction);
- if (ret < 0) {
- dev_err(&p->pdev->dev,
- "failed to request irq %d\n", irq);
- return ret;
- }
- clockevents_register_device(&p->ced);
- platform_set_drvdata(pdev, p);
+ timer8_priv.mapbase = base;
- return 0;
-}
-
-static int timer8_probe(struct platform_device *pdev)
-{
- struct timer8_priv *p = platform_get_drvdata(pdev);
-
- if (p) {
- dev_info(&pdev->dev, "kept as earlytimer\n");
- return 0;
+ timer8_priv.rate = clk_get_rate(clk) / SCALE;
+ if (!timer8_priv.rate) {
+ pr_err("Failed to get rate for the clocksource\n");
+ goto unmap_reg;
}
- p = devm_kzalloc(&pdev->dev, sizeof(*p), GFP_KERNEL);
- if (!p)
- return -ENOMEM;
-
- return timer8_setup(p, pdev);
-}
-
-static int timer8_remove(struct platform_device *pdev)
-{
- return -EBUSY;
-}
-
-static const struct of_device_id timer8_of_table[] __maybe_unused = {
- { .compatible = "renesas,8bit-timer" },
- { }
-};
-
-MODULE_DEVICE_TABLE(of, timer8_of_table);
-static struct platform_driver timer8_driver = {
- .probe = timer8_probe,
- .remove = timer8_remove,
- .driver = {
- .name = "h8300-8timer",
- .of_match_table = of_match_ptr(timer8_of_table),
+ if (request_irq(irq, timer8_interrupt, IRQF_TIMER,
+ timer8_priv.ced.name, &timer8_priv) < 0) {
+ pr_err("failed to request irq %d for clockevent\n", irq);
+ goto unmap_reg;
}
-};
-static int __init timer8_init(void)
-{
- return platform_driver_register(&timer8_driver);
-}
+ clockevents_config_and_register(&timer8_priv.ced,
+ timer8_priv.rate, 1, 0x0000ffff);
-static void __exit timer8_exit(void)
-{
- platform_driver_unregister(&timer8_driver);
+ return;
+unmap_reg:
+ iounmap(base);
+free_clk:
+ clk_put(clk);
}
-subsys_initcall(timer8_init);
-module_exit(timer8_exit);
-MODULE_AUTHOR("Yoshinori Sato");
-MODULE_DESCRIPTION("H8/300 8bit Timer Driver");
-MODULE_LICENSE("GPL v2");
+CLOCKSOURCE_OF_DECLARE(h8300_8bit, "renesas,8bit-timer", h8300_8timer_init);