1 files changed, 209 insertions, 0 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_volt.c b/drivers/gpu/drm/nouveau/nouveau_volt.c
new file mode 100644
index 000000000000..6ce857688eb6
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nouveau_volt.c
@@ -0,0 +1,209 @@
+/*
+ * 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_pm.h"
+
+static const enum dcb_gpio_tag vidtag[] = { 0x04, 0x05, 0x06, 0x1a };
+static int nr_vidtag = sizeof(vidtag) / sizeof(vidtag[0]);
+
+int
+nouveau_voltage_gpio_get(struct drm_device *dev)
+{
+        struct drm_nouveau_private *dev_priv = dev->dev_private;
+        struct nouveau_gpio_engine *gpio = &dev_priv->engine.gpio;
+        struct nouveau_pm_voltage *volt = &dev_priv->engine.pm.voltage;
+        u8 vid = 0;
+        int i;
+
+        for (i = 0; i < nr_vidtag; i++) {
+                if (!(volt->vid_mask & (1 << i)))
+                        continue;
+
+                vid |= gpio->get(dev, vidtag[i]) << i;
+        }
+
+        return nouveau_volt_lvl_lookup(dev, vid);
+}
+
+int
+nouveau_voltage_gpio_set(struct drm_device *dev, int voltage)
+{
+        struct drm_nouveau_private *dev_priv = dev->dev_private;
+        struct nouveau_gpio_engine *gpio = &dev_priv->engine.gpio;
+        struct nouveau_pm_voltage *volt = &dev_priv->engine.pm.voltage;
+        int vid, i;
+
+        vid = nouveau_volt_vid_lookup(dev, voltage);
+        if (vid < 0)
+                return vid;
+
+        for (i = 0; i < nr_vidtag; i++) {
+                if (!(volt->vid_mask & (1 << i)))
+                        continue;
+
+                gpio->set(dev, vidtag[i], !!(vid & (1 << i)));
+        }
+
+        return 0;
+}
+
+int
+nouveau_volt_vid_lookup(struct drm_device *dev, int voltage)
+{
+        struct drm_nouveau_private *dev_priv = dev->dev_private;
+        struct nouveau_pm_voltage *volt = &dev_priv->engine.pm.voltage;
+        int i;
+
+        for (i = 0; i < volt->nr_level; i++) {
+                if (volt->level[i].voltage == voltage)
+                        return volt->level[i].vid;
+        }
+
+        return -ENOENT;
+}
+
+int
+nouveau_volt_lvl_lookup(struct drm_device *dev, int vid)
+{
+        struct drm_nouveau_private *dev_priv = dev->dev_private;
+        struct nouveau_pm_voltage *volt = &dev_priv->engine.pm.voltage;
+        int i;
+
+        for (i = 0; i < volt->nr_level; i++) {
+                if (volt->level[i].vid == vid)
+                        return volt->level[i].voltage;
+        }
+
+        return -ENOENT;
+}
+
+void
+nouveau_volt_init(struct drm_device *dev)
+{
+        struct drm_nouveau_private *dev_priv = dev->dev_private;
+        struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
+        struct nouveau_pm_voltage *voltage = &pm->voltage;
+        struct nvbios *bios = &dev_priv->vbios;
+        struct bit_entry P;
+        u8 *volt = NULL, *entry;
+        int i, recordlen, entries, vidmask, vidshift;
+
+        if (bios->type == NVBIOS_BIT) {
+                if (bit_table(dev, 'P', &P))
+                        return;
+
+                if (P.version == 1)
+                        volt = ROMPTR(bios, P.data[16]);
+                else
+                if (P.version == 2)
+                        volt = ROMPTR(bios, P.data[12]);
+                else {
+                        NV_WARN(dev, "unknown volt for BIT P %d\n", P.version);
+                }
+        } else {
+                if (bios->data[bios->offset + 6] < 0x27) {
+                        NV_DEBUG(dev, "BMP version too old for voltage\n");
+                        return;
+                }
+
+                volt = ROMPTR(bios, bios->data[bios->offset + 0x98]);
+        }
+
+        if (!volt) {
+                NV_DEBUG(dev, "voltage table pointer invalid\n");
+                return;
+        }
+
+        switch (volt[0]) {
+        case 0x10:
+        case 0x11:
+        case 0x12:
+                recordlen = 5;
+                entries   = volt[2];
+                vidshift  = 0;
+                vidmask   = volt[4];
+                break;
+        case 0x20:
+                recordlen = volt[3];
+                entries   = volt[2];
+                vidshift  = 0; /* could be vidshift like 0x30? */
+                vidmask   = volt[5];
+                break;
+        case 0x30:
+                recordlen = volt[2];
+                entries   = volt[3];
+                vidshift  = hweight8(volt[5]);
+                vidmask   = volt[4];
+                break;
+        default:
+                NV_WARN(dev, "voltage table 0x%02x unknown\n", volt[0]);
+                return;
+        }
+
+        /* validate vid mask */
+        voltage->vid_mask = vidmask;
+        if (!voltage->vid_mask)
+                return;
+
+        i = 0;
+        while (vidmask) {
+                if (i > nr_vidtag) {
+                        NV_DEBUG(dev, "vid bit %d unknown\n", i);
+                        return;
+                }
+
+                if (!nouveau_bios_gpio_entry(dev, vidtag[i])) {
+                        NV_DEBUG(dev, "vid bit %d has no gpio tag\n", i);
+                        return;
+                }
+
+                vidmask >>= 1;
+                i++;
+        }
+
+        /* parse vbios entries into common format */
+        voltage->level = kcalloc(entries, sizeof(*voltage->level), GFP_KERNEL);
+        if (!voltage->level)
+                return;
+
+        entry = volt + volt[1];
+        for (i = 0; i < entries; i++, entry += recordlen) {
+                voltage->level[i].voltage = entry[0];
+                voltage->level[i].vid     = entry[1] >> vidshift;
+        }
+        voltage->nr_level  = entries;
+        voltage->supported = true;
+}
+
+void
+nouveau_volt_fini(struct drm_device *dev)
+{
+        struct drm_nouveau_private *dev_priv = dev->dev_private;
+        struct nouveau_pm_voltage *volt = &dev_priv->engine.pm.voltage;
+
+        kfree(volt->level);
+}