1 files changed, 254 insertions, 0 deletions

diff --git a/drivers/clocksource/h8300_timer16.c b/drivers/clocksource/h8300_timer16.c
new file mode 100644
index 000000000000..82941c1e9e33
--- /dev/null
+++ b/drivers/clocksource/h8300_timer16.c
@@ -0,0 +1,254 @@
+/*
+ *  H8/300 16bit Timer driver
+ *
+ *  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>
+
+#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
+
+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;
+        unsigned short cs_enabled;
+        unsigned char enb;
+        unsigned char imfa;
+        unsigned char imiea;
+        unsigned char ovf;
+        raw_spinlock_t lock;
+        struct clk *clk;
+};
+
+static unsigned long timer16_get_counter(struct timer16_priv *p)
+{
+        unsigned long v1, v2, v3;
+        int o1, o2;
+
+        o1 = ctrl_inb(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;
+        } while (unlikely((o1 != o2) || (v1 > v2 && v1 < v3)
+                          || (v2 > v3 && v2 < v1) || (v3 > v1 && v3 < v2)));
+
+        v2 |= 0x10000;
+        return v2;
+}
+
+
+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);
+        p->total_cycles += 0x10000;
+
+        return IRQ_HANDLED;
+}
+
+static inline struct timer16_priv *cs_to_priv(struct clocksource *cs)
+{
+        return container_of(cs, struct timer16_priv, 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;
+
+        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;
+}
+
+static int timer16_enable(struct clocksource *cs)
+{
+        struct timer16_priv *p = cs_to_priv(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);
+
+        p->cs_enabled = true;
+        return 0;
+}
+
+static void timer16_disable(struct clocksource *cs)
+{
+        struct timer16_priv *p = cs_to_priv(cs);
+
+        WARN_ON(!p->cs_enabled);
+
+        ctrl_outb(ctrl_inb(p->mapcommon + TSTR) & ~p->enb,
+                  p->mapcommon + TSTR);
+
+        p->cs_enabled = false;
+}
+
+#define REG_CH   0
+#define REG_COMM 1
+
+static int timer16_setup(struct timer16_priv *p, struct platform_device *pdev)
+{
+        struct resource *res[2];
+        int ret, irq;
+        unsigned int ch;
+
+        memset(p, 0, sizeof(*p));
+        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;
+        }
+
+        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);
+        }
+        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;
+        }
+
+        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;
+        }
+
+        p = devm_kzalloc(&pdev->dev, sizeof(*p), GFP_KERNEL);
+        if (!p)
+                return -ENOMEM;
+
+        return timer16_setup(p, pdev);
+}
+
+static int timer16_remove(struct platform_device *pdev)
+{
+        return -EBUSY;
+}
+
+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),
+        }
+};
+
+static int __init timer16_init(void)
+{
+        return platform_driver_register(&timer16_driver);
+}
+
+static void __exit timer16_exit(void)
+{
+        platform_driver_unregister(&timer16_driver);
+}
+
+subsys_initcall(timer16_init);
+module_exit(timer16_exit);
+MODULE_AUTHOR("Yoshinori Sato");
+MODULE_DESCRIPTION("H8/300H 16bit Timer Driver");
+MODULE_LICENSE("GPL v2");