refactor: make pci device driver loading passive, pci bus scanner will not load them...

[lunaix-os.git] / lunaix-os / hal / timer / timer_device.c

diff --git a/lunaix-os/hal/timer/timer_device.c b/lunaix-os/hal/timer/timer_device.c
new file mode 100644 (file)
index 0000000..c5341be
--- /dev/null
+++ b/lunaix-os/hal/timer/timer_device.c
@@ -0,0 +1,66 @@
+#include <lunaix/spike.h>
+#include <lunaix/time.h>
+
+#include <hal/hwtimer.h>
+
+const struct hwtimer* systimer;
+
+ticks_t
+hwtimer_base_frequency()
+{
+    assert(systimer);
+    return systimer->base_freq;
+}
+
+ticks_t
+hwtimer_current_systicks()
+{
+    assert(systimer);
+    return systimer->systicks();
+}
+
+ticks_t
+hwtimer_to_ticks(u32_t value, int unit)
+{
+    assert(systimer);
+    // in case system frequency is less than 1000Hz
+    if (unit != TIME_MS) {
+        return systimer->running_freq * unit * value;
+    }
+
+    ticks_t freq_ms = systimer->running_freq / 1000;
+
+    return freq_ms * value;
+}
+
+static int
+__hwtimer_ioctl(struct device* dev, u32_t req, va_list args)
+{
+    struct hwtimer* hwt = (struct hwtimer*)dev->underlay;
+    switch (req) {
+        case TIMERIO_GETINFO:
+            // TODO
+            break;
+
+        default:
+            break;
+    }
+    return 0;
+}
+
+void
+hwtimer_init(u32_t hertz, void* tick_callback)
+{
+    struct hwtimer* hwt_ctx = hwtimer_choose();
+
+    hwt_ctx->init(hwt_ctx, hertz, tick_callback);
+    hwt_ctx->running_freq = hertz;
+
+    systimer = hwt_ctx;
+
+    struct device* timerdev = device_allocsys(NULL, hwt_ctx);
+
+    timerdev->ops.exec_cmd = __hwtimer_ioctl;
+
+    device_register(timerdev, &hwt_ctx->class, hwt_ctx->name);
+}
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