diff options
Diffstat (limited to 'drivers/gpu/drm/nouveau/nouveau_volt.c')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nouveau_volt.c | 212 |
1 files changed, 212 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 00000000000..04fdc00a67d --- /dev/null +++ b/drivers/gpu/drm/nouveau/nouveau_volt.c @@ -0,0 +1,212 @@ +/* + * 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); +} |