--- /dev/null
+/*
+ * 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, headerlen, 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:
+ headerlen = 5;
+ recordlen = volt[1];
+ entries = volt[2];
+ vidshift = 0;
+ vidmask = volt[4];
+ break;
+ case 0x20:
+ headerlen = volt[1];
+ recordlen = volt[3];
+ entries = volt[2];
+ vidshift = 0; /* could be vidshift like 0x30? */
+ vidmask = volt[5];
+ break;
+ case 0x30:
+ headerlen = volt[1];
+ 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 + headerlen;
+ 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);
+}
projects / mv-sheeva.git / blobdiff