drm/nouveau: Add DRM driver for NVIDIA GPUs

This adds a drm/kms staging non-API stable driver for GPUs from NVIDIA.

This driver is a KMS-based driver and requires a compatible nouveau
userspace libdrm and nouveau X.org driver.

This driver requires firmware files not available in this kernel tree,
interested parties can find them via the nouveau project git archive.

This driver is reverse engineered, and is in no way supported by nVidia.

Support for nearly the complete range of nvidia hw from nv04->g80 (nv50)
is available, and the kms driver should support driving nearly all
output types (displayport is under development still) along with supporting
suspend/resume.

This work is all from the upstream nouveau project found at
nouveau.freedesktop.org.

The original authors list from nouveau git tree is:
Anssi Hannula <anssi.hannula@iki.fi>
Ben Skeggs <bskeggs@redhat.com>
Francisco Jerez <currojerez@riseup.net>
Maarten Maathuis <madman2003@gmail.com>
Marcin Kościelnicki <koriakin@0x04.net>
Matthew Garrett <mjg@redhat.com>
Matt Parnell <mparnell@gmail.com>
Patrice Mandin <patmandin@gmail.com>
Pekka Paalanen <pq@iki.fi>
Xavier Chantry <shiningxc@gmail.com>
along with project founder Stephane Marchesin <marchesin@icps.u-strasbg.fr>

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 155 insertions, 0 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_backlight.c b/drivers/gpu/drm/nouveau/nouveau_backlight.c
new file mode 100644
index 000000000000..20564f8cb0ec
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nouveau_backlight.c
@@ -0,0 +1,155 @@
+/*
+ * Copyright (C) 2009 Red Hat <mjg@redhat.com>
+ *
+ * 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 (including the
+ * next paragraph) 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 OWNER(S) AND/OR ITS SUPPLIERS 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:
+ *  Matthew Garrett <mjg@redhat.com>
+ *
+ * Register locations derived from NVClock by Roderick Colenbrander
+ */
+
+#include <linux/backlight.h>
+
+#include "drmP.h"
+#include "nouveau_drv.h"
+#include "nouveau_drm.h"
+#include "nouveau_reg.h"
+
+static int nv40_get_intensity(struct backlight_device *bd)
+{
+        struct drm_device *dev = bl_get_data(bd);
+        int val = (nv_rd32(dev, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK)
+                                                                        >> 16;
+
+        return val;
+}
+
+static int nv40_set_intensity(struct backlight_device *bd)
+{
+        struct drm_device *dev = bl_get_data(bd);
+        int val = bd->props.brightness;
+        int reg = nv_rd32(dev, NV40_PMC_BACKLIGHT);
+
+        nv_wr32(dev, NV40_PMC_BACKLIGHT,
+                 (val << 16) | (reg & ~NV40_PMC_BACKLIGHT_MASK));
+
+        return 0;
+}
+
+static struct backlight_ops nv40_bl_ops = {
+        .options = BL_CORE_SUSPENDRESUME,
+        .get_brightness = nv40_get_intensity,
+        .update_status = nv40_set_intensity,
+};
+
+static int nv50_get_intensity(struct backlight_device *bd)
+{
+        struct drm_device *dev = bl_get_data(bd);
+
+        return nv_rd32(dev, NV50_PDISPLAY_SOR_BACKLIGHT);
+}
+
+static int nv50_set_intensity(struct backlight_device *bd)
+{
+        struct drm_device *dev = bl_get_data(bd);
+        int val = bd->props.brightness;
+
+        nv_wr32(dev, NV50_PDISPLAY_SOR_BACKLIGHT,
+                val | NV50_PDISPLAY_SOR_BACKLIGHT_ENABLE);
+        return 0;
+}
+
+static struct backlight_ops nv50_bl_ops = {
+        .options = BL_CORE_SUSPENDRESUME,
+        .get_brightness = nv50_get_intensity,
+        .update_status = nv50_set_intensity,
+};
+
+static int nouveau_nv40_backlight_init(struct drm_device *dev)
+{
+        struct drm_nouveau_private *dev_priv = dev->dev_private;
+        struct backlight_device *bd;
+
+        if (!(nv_rd32(dev, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK))
+                return 0;
+
+        bd = backlight_device_register("nv_backlight", &dev->pdev->dev, dev,
+                                       &nv40_bl_ops);
+        if (IS_ERR(bd))
+                return PTR_ERR(bd);
+
+        dev_priv->backlight = bd;
+        bd->props.max_brightness = 31;
+        bd->props.brightness = nv40_get_intensity(bd);
+        backlight_update_status(bd);
+
+        return 0;
+}
+
+static int nouveau_nv50_backlight_init(struct drm_device *dev)
+{
+        struct drm_nouveau_private *dev_priv = dev->dev_private;
+        struct backlight_device *bd;
+
+        if (!nv_rd32(dev, NV50_PDISPLAY_SOR_BACKLIGHT))
+                return 0;
+
+        bd = backlight_device_register("nv_backlight", &dev->pdev->dev, dev,
+                                       &nv50_bl_ops);
+        if (IS_ERR(bd))
+                return PTR_ERR(bd);
+
+        dev_priv->backlight = bd;
+        bd->props.max_brightness = 1025;
+        bd->props.brightness = nv50_get_intensity(bd);
+        backlight_update_status(bd);
+        return 0;
+}
+
+int nouveau_backlight_init(struct drm_device *dev)
+{
+        struct drm_nouveau_private *dev_priv = dev->dev_private;
+
+        switch (dev_priv->card_type) {
+        case NV_40:
+                return nouveau_nv40_backlight_init(dev);
+        case NV_50:
+                return nouveau_nv50_backlight_init(dev);
+        default:
+                break;
+        }
+
+        return 0;
+}
+
+void nouveau_backlight_exit(struct drm_device *dev)
+{
+        struct drm_nouveau_private *dev_priv = dev->dev_private;
+
+        if (dev_priv->backlight) {
+                backlight_device_unregister(dev_priv->backlight);
+                dev_priv->backlight = NULL;
+        }
+}