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-rw-r--r--linux-core/nouveau_backlight.c93
-rw-r--r--shared-core/nouveau_reg.h4
2 files changed, 97 insertions, 0 deletions
diff --git a/linux-core/nouveau_backlight.c b/linux-core/nouveau_backlight.c
index 1b36f3cf..3a68d924 100644
--- a/linux-core/nouveau_backlight.c
+++ b/linux-core/nouveau_backlight.c
@@ -27,6 +27,10 @@
* Authors:
* Matthew Garrett <mjg@redhat.com>
*
+ * PowerPC specific stuff:
+ * Danny Tholen <moondrake@gmail.com>
+ * (mainly based on info from nvidiafb)
+ *
* Register locations derived from NVClock by Roderick Colenbrander
*/
@@ -36,9 +40,54 @@
#include "nouveau_drv.h"
#include "nouveau_drm.h"
#include "nouveau_reg.h"
+#ifdef CONFIG_PMAC_BACKLIGHT
+#include <asm/backlight.h>
+#endif
#if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) && (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23))
+#ifdef CONFIG_PMAC_BACKLIGHT
+static int ppc_get_intensity(struct backlight_device *bd)
+{
+ struct drm_device *dev = bl_get_data(bd);
+ struct drm_nouveau_private *dev_priv = dev->dev_private;
+ int raw_val = (NV_READ(NV_PBUS_DEBUG_DUALHEAD_CTL) & 0x7fff0000) >> 16;
+ int min_brightness = bd->props.max_brightness / 3;
+ int intensity = raw_val - min_brightness;
+
+ return (intensity < 0 ? 0 : intensity);
+}
+
+static int ppc_set_intensity(struct backlight_device *bd)
+{
+ struct drm_device *dev = bl_get_data(bd);
+ struct drm_nouveau_private *dev_priv = dev->dev_private;
+ int val = bd->props.brightness;
+ int min_brightness = bd->props.max_brightness / 3;
+ int dh_ctl = NV_READ(NV_PBUS_DEBUG_DUALHEAD_CTL) & 0x0000ffff;
+ int gpio_ext = NV_READ(NV_PCRTC_GPIO_EXT) & ~0x3;
+
+ if (val > 0) {
+ dh_ctl |= (1 << 31); /* backlight bit on */
+ dh_ctl |= (val + min_brightness) << 16;
+ gpio_ext |= 0x1;
+ }
+
+ NV_WRITE(NV_PBUS_DEBUG_DUALHEAD_CTL, dh_ctl);
+ NV_WRITE(NV_PCRTC_GPIO_EXT, gpio_ext);
+
+ return 0;
+}
+
+static struct backlight_ops ppc_bl_ops = {
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,29))
+ .options = BL_CORE_SUSPENDRESUME,
+#endif
+ .get_brightness = ppc_get_intensity,
+ .update_status = ppc_set_intensity,
+};
+#endif /* CONFIG_PMAC_BACKLIGHT */
+
static int nv40_get_intensity(struct backlight_device *bd)
{
struct drm_device *dev = bl_get_data(bd);
@@ -96,6 +145,45 @@ static struct backlight_ops nv50_bl_ops = {
.update_status = nv50_set_intensity,
};
+#ifdef CONFIG_PMAC_BACKLIGHT
+static int nouveau_ppc_backlight_init(struct drm_device *dev)
+{
+ struct drm_nouveau_private *dev_priv = dev->dev_private;
+ struct backlight_device *bd;
+ int max_brightness;
+
+ if (!machine_is(powermac) ||
+ !pmac_has_backlight_type("mnca"))
+ return -ENODEV;
+
+ /* "nv_bl0", some old powerpc userland tools rely on this */
+ bd = backlight_device_register("nv_bl0", &dev->pdev->dev, dev,
+ &ppc_bl_ops);
+ if (IS_ERR(bd))
+ return PTR_ERR(bd);
+
+ dev_priv->backlight = bd;
+
+ /* the least significant 15 bits of NV_PBUS_DEBUG_DUALHEAD_CTL
+ * set the maximum backlight level, OF sets it to 0x535 on my
+ * powerbook. however, posting the card sets this to 0x7FFF.
+ * Below 25% the blacklight turns off.
+ *
+ * NOTE: pbbuttonsd limits brightness values < 255, and thus
+ * will not work well with this.
+ */
+
+ /* FIXME: do we want to fix this reg to 0x535 for consistency? */
+ max_brightness = NV_READ(NV_PBUS_DEBUG_DUALHEAD_CTL) & 0x0000ffff;
+ /* lose (bottom) 25% of range */
+ bd->props.max_brightness = (max_brightness * 3) / 4;
+ bd->props.brightness = ppc_get_intensity(bd);
+ backlight_update_status(bd);
+
+ return 0;
+}
+#endif
+
static int nouveau_nv40_backlight_init(struct drm_device *dev)
{
struct drm_nouveau_private *dev_priv = dev->dev_private;
@@ -142,6 +230,11 @@ int nouveau_backlight_init(struct drm_device *dev)
struct drm_nouveau_private *dev_priv = dev->dev_private;
switch (dev_priv->card_type) {
+#ifdef CONFIG_PMAC_BACKLIGHT
+ case NV_17:
+ case NV_30:
+ return nouveau_ppc_backlight_init(dev);
+#endif
case NV_40:
case NV_44:
return nouveau_nv40_backlight_init(dev);
diff --git a/shared-core/nouveau_reg.h b/shared-core/nouveau_reg.h
index eade44e5..695bf5d7 100644
--- a/shared-core/nouveau_reg.h
+++ b/shared-core/nouveau_reg.h
@@ -95,6 +95,9 @@
* the card will hang early on in the X init process.
*/
# define NV_PMC_ENABLE_UNK13 (1<<13)
+
+#define NV_PBUS_DEBUG_DUALHEAD_CTL 0x000010F0
+
#define NV40_PMC_BACKLIGHT 0x000015f0
# define NV40_PMC_BACKLIGHT_MASK 0x001f0000
#define NV40_PMC_1700 0x00001700
@@ -404,6 +407,7 @@
#define NV40_PGRAPH_TSIZE1(i) (0x00406908 + (i*16))
#define NV40_PGRAPH_TSTATUS1(i) (0x0040690C + (i*16))
+#define NV_PCRTC_GPIO_EXT 0x0060081C
/* It's a guess that this works on NV03. Confirmed on NV04, though */
#define NV04_PFIFO_DELAY_0 0x00002040