1 files changed, 96 insertions, 0 deletions

diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/volt/gpio.c b/drivers/gpu/drm/nouveau/nvkm/subdev/volt/gpio.c
new file mode 100644
index 000000000000..755fa91bcd09
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/volt/gpio.c
@@ -0,0 +1,96 @@
+/*
+ * Copyright 2013 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 <subdev/volt.h>
+#include <subdev/gpio.h>
+#include <subdev/bios/gpio.h>
+
+static const u8 tags[] = {
+        DCB_GPIO_VID0, DCB_GPIO_VID1, DCB_GPIO_VID2, DCB_GPIO_VID3,
+        DCB_GPIO_VID4, DCB_GPIO_VID5, DCB_GPIO_VID6, DCB_GPIO_VID7,
+};
+
+int
+nouveau_voltgpio_get(struct nouveau_volt *volt)
+{
+        struct nouveau_gpio *gpio = nouveau_gpio(volt);
+        u8 vid = 0;
+        int i;
+
+        for (i = 0; i < ARRAY_SIZE(tags); i++) {
+                if (volt->vid_mask & (1 << i)) {
+                        int ret = gpio->get(gpio, 0, tags[i], 0xff);
+                        if (ret < 0)
+                                return ret;
+                        vid |= ret << i;
+                }
+        }
+
+        return vid;
+}
+
+int
+nouveau_voltgpio_set(struct nouveau_volt *volt, u8 vid)
+{
+        struct nouveau_gpio *gpio = nouveau_gpio(volt);
+        int i;
+
+        for (i = 0; i < ARRAY_SIZE(tags); i++, vid >>= 1) {
+                if (volt->vid_mask & (1 << i)) {
+                        int ret = gpio->set(gpio, 0, tags[i], 0xff, vid & 1);
+                        if (ret < 0)
+                                return ret;
+                }
+        }
+
+        return 0;
+}
+
+int
+nouveau_voltgpio_init(struct nouveau_volt *volt)
+{
+        struct nouveau_gpio *gpio = nouveau_gpio(volt);
+        struct dcb_gpio_func func;
+        int i;
+
+        /* check we have gpio function info for each vid bit.  on some
+         * boards (ie. nvs295) the vid mask has more bits than there
+         * are valid gpio functions... from traces, nvidia appear to
+         * just touch the existing ones, so let's mask off the invalid
+         * bits and continue with life
+         */
+        for (i = 0; i < ARRAY_SIZE(tags); i++) {
+                if (volt->vid_mask & (1 << i)) {
+                        int ret = gpio->find(gpio, 0, tags[i], 0xff, &func);
+                        if (ret) {
+                                if (ret != -ENOENT)
+                                        return ret;
+                                nv_debug(volt, "VID bit %d has no GPIO\n", i);
+                                volt->vid_mask &= ~(1 << i);
+                        }
+                }
+        }
+
+        return 0;
+}