1 files changed, 85 insertions, 0 deletions
diff --git a/drm/nouveau/nvkm/subdev/timer/nv41.c b/drm/nouveau/nvkm/subdev/timer/nv41.c
new file mode 100644
index 000000000..3cf9ec1b1
--- /dev/null
+++ b/drm/nouveau/nvkm/subdev/timer/nv41.c
@@ -0,0 +1,85 @@
+/*
+ * Copyright 2012 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: Ben Skeggs
+ */
+#include "priv.h"
+#include "regsnv04.h"
+
+static void
+nv41_timer_init(struct nvkm_timer *tmr)
+{
+	struct nvkm_subdev *subdev = &tmr->subdev;
+	struct nvkm_device *device = subdev->device;
+	u32 f = device->crystal;
+	u32 m = 1, n, d;
+
+	/* aim for 31.25MHz, which gives us nanosecond timestamps */
+	d = 1000000 / 32;
+	n = f;
+
+	while (n < (d * 2)) {
+		n += (n / m);
+		m++;
+	}
+
+	/* reduce ratio to acceptable values */
+	while (((n % 5) == 0) && ((d % 5) == 0)) {
+		n /= 5;
+		d /= 5;
+	}
+
+	while (((n % 2) == 0) && ((d % 2) == 0)) {
+		n /= 2;
+		d /= 2;
+	}
+
+	while (n > 0xffff || d > 0xffff) {
+		n >>= 1;
+		d >>= 1;
+	}
+
+	nvkm_debug(subdev, "input frequency : %dHz\n", f);
+	nvkm_debug(subdev, "input multiplier: %d\n", m);
+	nvkm_debug(subdev, "numerator       : %08x\n", n);
+	nvkm_debug(subdev, "denominator     : %08x\n", d);
+	nvkm_debug(subdev, "timer frequency : %dHz\n", (f * m) * d / n);
+
+	nvkm_wr32(device, 0x009220, m - 1);
+	nvkm_wr32(device, NV04_PTIMER_NUMERATOR, n);
+	nvkm_wr32(device, NV04_PTIMER_DENOMINATOR, d);
+}
+
+static const struct nvkm_timer_func
+nv41_timer = {
+	.init = nv41_timer_init,
+	.intr = nv04_timer_intr,
+	.read = nv04_timer_read,
+	.time = nv04_timer_time,
+	.alarm_init = nv04_timer_alarm_init,
+	.alarm_fini = nv04_timer_alarm_fini,
+};
+
+int
+nv41_timer_new(struct nvkm_device *device, int index, struct nvkm_timer **ptmr)
+{
+	return nvkm_timer_new_(&nv41_timer, device, index, ptmr);
+}