drm/nv50: implement gpio set/get routines
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/nv50_gpio.c b/drivers/gpu/drm/nouveau/nv50_gpio.c
new file mode 100644
index 0000000..c61782b
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nv50_gpio.c
@@ -0,0 +1,76 @@
+/*
+ * Copyright 2010 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 "drmP.h"
+#include "nouveau_drv.h"
+#include "nouveau_hw.h"
+
+static int
+nv50_gpio_location(struct dcb_gpio_entry *gpio, uint32_t *reg, uint32_t *shift)
+{
+ const uint32_t nv50_gpio_reg[4] = { 0xe104, 0xe108, 0xe280, 0xe284 };
+
+ if (gpio->line > 32)
+ return -EINVAL;
+
+ *reg = nv50_gpio_reg[gpio->line >> 3];
+ *shift = (gpio->line & 7) << 2;
+ return 0;
+}
+
+int
+nv50_gpio_get(struct drm_device *dev, enum dcb_gpio_tag tag)
+{
+ struct dcb_gpio_entry *gpio;
+ uint32_t r, s, v;
+
+ gpio = nouveau_bios_gpio_entry(dev, tag);
+ if (!gpio)
+ return -ENOENT;
+
+ if (nv50_gpio_location(gpio, &r, &s))
+ return -EINVAL;
+
+ v = nv_rd32(dev, r) >> (s + 2);
+ return ((v & 1) == (gpio->state[1] & 1));
+}
+
+int
+nv50_gpio_set(struct drm_device *dev, enum dcb_gpio_tag tag, int state)
+{
+ struct dcb_gpio_entry *gpio;
+ uint32_t r, s, v;
+
+ gpio = nouveau_bios_gpio_entry(dev, tag);
+ if (!gpio)
+ return -ENOENT;
+
+ if (nv50_gpio_location(gpio, &r, &s))
+ return -EINVAL;
+
+ v = nv_rd32(dev, r) & ~(0x3 << s);
+ v |= (gpio->state[state] ^ 2) << s;
+ nv_wr32(dev, r, v);
+ return 0;
+}