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path: root/drivers/gpu/drm/nouveau/nv17_gpio.c
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Diffstat (limited to 'drivers/gpu/drm/nouveau/nv17_gpio.c')
-rw-r--r--drivers/gpu/drm/nouveau/nv17_gpio.c92
1 files changed, 92 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nv17_gpio.c b/drivers/gpu/drm/nouveau/nv17_gpio.c
new file mode 100644
index 0000000..2e58c33
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nv17_gpio.c
@@ -0,0 +1,92 @@
+/*
+ * Copyright (C) 2009 Francisco Jerez.
+ * All Rights Reserved.
+ *
+ * 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.
+ *
+ */
+
+#include "drmP.h"
+#include "nouveau_drv.h"
+#include "nouveau_hw.h"
+
+static bool
+get_gpio_location(struct dcb_gpio_entry *ent, uint32_t *reg, uint32_t *shift,
+ uint32_t *mask)
+{
+ if (ent->line < 2) {
+ *reg = NV_PCRTC_GPIO;
+ *shift = ent->line * 16;
+ *mask = 0x11;
+
+ } else if (ent->line < 10) {
+ *reg = NV_PCRTC_GPIO_EXT;
+ *shift = (ent->line - 2) * 4;
+ *mask = 0x3;
+
+ } else if (ent->line < 14) {
+ *reg = NV_PCRTC_850;
+ *shift = (ent->line - 10) * 4;
+ *mask = 0x3;
+
+ } else {
+ return false;
+ }
+
+ return true;
+}
+
+int
+nv17_gpio_get(struct drm_device *dev, enum dcb_gpio_tag tag)
+{
+ struct dcb_gpio_entry *ent = nouveau_bios_gpio_entry(dev, tag);
+ uint32_t reg, shift, mask, value;
+
+ if (!ent)
+ return -ENODEV;
+
+ if (!get_gpio_location(ent, &reg, &shift, &mask))
+ return -ENODEV;
+
+ value = NVReadCRTC(dev, 0, reg) >> shift;
+
+ return (ent->invert ? 1 : 0) ^ (value & 1);
+}
+
+int
+nv17_gpio_set(struct drm_device *dev, enum dcb_gpio_tag tag, int state)
+{
+ struct dcb_gpio_entry *ent = nouveau_bios_gpio_entry(dev, tag);
+ uint32_t reg, shift, mask, value;
+
+ if (!ent)
+ return -ENODEV;
+
+ if (!get_gpio_location(ent, &reg, &shift, &mask))
+ return -ENODEV;
+
+ value = ((ent->invert ? 1 : 0) ^ (state ? 1 : 0)) << shift;
+ mask = ~(mask << shift);
+
+ NVWriteCRTC(dev, 0, reg, value | (NVReadCRTC(dev, 0, reg) & mask));
+
+ return 0;
+}
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