drm/nvd0/gpio: initial implementation

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

drivers/gpu/drm/nouveau/nouveau_bios.c

@@ -5884,9 +5884,15 @@ parse_dcb_gpio_table(struct nvbios *bios)
 			}
 
 			e->line = (e->entry & 0x0000001f) >> 0;
+			if (gpio[0] == 0x40) {
 				e->state_default = (e->entry & 0x01000000) >> 24;
 				e->state[0] = (e->entry & 0x18000000) >> 27;
 				e->state[1] = (e->entry & 0x60000000) >> 29;
+			} else {
+				e->state_default = (e->entry & 0x00000080) >> 7;
+				e->state[0] = (entry[4] >> 4) & 3;
+				e->state[1] = (entry[4] >> 6) & 3;
+			}
 		}
 	}
 

drivers/gpu/drm/nouveau/nouveau_drv.h

@@ -1391,6 +1391,8 @@ int nv50_gpio_init(struct drm_device *dev);
 void nv50_gpio_fini(struct drm_device *dev);
 int nv50_gpio_get(struct drm_device *dev, enum dcb_gpio_tag tag);
 int nv50_gpio_set(struct drm_device *dev, enum dcb_gpio_tag tag, int state);
+int nvd0_gpio_get(struct drm_device *dev, enum dcb_gpio_tag tag);
+int nvd0_gpio_set(struct drm_device *dev, enum dcb_gpio_tag tag, int state);
 int  nv50_gpio_irq_register(struct drm_device *, enum dcb_gpio_tag,
 			    void (*)(void *, int), void *);
 void nv50_gpio_irq_unregister(struct drm_device *, enum dcb_gpio_tag,

drivers/gpu/drm/nouveau/nouveau_state.c

@@ -459,8 +459,13 @@ static int nouveau_init_engine_ptrs(struct drm_device *dev)
 		engine->display.create		= nouveau_stub_init;
 		engine->display.init		= nouveau_stub_init;
 		engine->display.destroy		= nouveau_stub_takedown;
-		engine->gpio.init		= nouveau_stub_init;
+		engine->gpio.init		= nv50_gpio_init;
 		engine->gpio.takedown		= nouveau_stub_takedown;
+		engine->gpio.get		= nvd0_gpio_get;
+		engine->gpio.set		= nvd0_gpio_set;
+		engine->gpio.irq_register	= nv50_gpio_irq_register;
+		engine->gpio.irq_unregister	= nv50_gpio_irq_unregister;
+		engine->gpio.irq_enable		= nv50_gpio_irq_enable;
 		engine->vram.init		= nvc0_vram_init;
 		engine->vram.takedown		= nv50_vram_fini;
 		engine->vram.get		= nvc0_vram_new;

drivers/gpu/drm/nouveau/nv50_gpio.c

@@ -97,6 +97,37 @@ nv50_gpio_set(struct drm_device *dev, enum dcb_gpio_tag tag, int state)
 	return 0;
 }
 
+int
+nvd0_gpio_get(struct drm_device *dev, enum dcb_gpio_tag tag)
+{
+	struct dcb_gpio_entry *gpio;
+	u32 v;
+
+	gpio = nouveau_bios_gpio_entry(dev, tag);
+	if (!gpio)
+		return -ENOENT;
+
+	v  = nv_rd32(dev, 0x00d610 + (gpio->line * 4));
+	v &= 0x00004000;
+	return (!!v == (gpio->state[1] & 1));
+}
+
+int
+nvd0_gpio_set(struct drm_device *dev, enum dcb_gpio_tag tag, int state)
+{
+	struct dcb_gpio_entry *gpio;
+	u32 v;
+
+	gpio = nouveau_bios_gpio_entry(dev, tag);
+	if (!gpio)
+		return -ENOENT;
+
+	v = gpio->state[state] ^ 2;
+
+	nv_mask(dev, 0x00d610 + (gpio->line * 4), 0x00003000, v << 12);
+	return 0;
+}
+
 int
 nv50_gpio_irq_register(struct drm_device *dev, enum dcb_gpio_tag tag,
 		       void (*handler)(void *, int), void *data)