| /* |
| * 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]; |
| vidmask = volt[4]; |
| /* no longer certain what volt[5] is, if it's related to |
| * the vid shift then it's definitely not a function of |
| * how many bits are set. |
| * |
| * after looking at a number of nva3+ vbios images, they |
| * all seem likely to have a static shift of 2.. lets |
| * go with that for now until proven otherwise. |
| */ |
| vidshift = 2; |
| 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); |
| } |