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/*
* 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 "nouveau_drv.h"
#include "nouveau_pm.h"

static const enum dcb_gpio_tag vidtag[] = { 0x04, 0x05, 0x06, 0x1a, 0x73 };
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_pm_voltage *volt = &dev_priv->engine.pm.voltage;
struct nouveau_gpio_engine *gpio = &dev_priv->engine.gpio;
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_range(struct drm_device *dev, int volt_min, int volt_max)
{
struct drm_nouveau_private *dev_priv = dev->dev_private;
struct nouveau_pm_voltage *volt = &dev_priv->engine.pm.voltage;
struct nouveau_gpio_engine *gpio = &dev_priv->engine.gpio;
int vid, i;

vid = nouveau_volt_vid_lookup_range(dev, volt_min, volt_max);
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_range(struct drm_device *dev, int volt_min, int volt_max)
{
struct drm_nouveau_private *dev_priv = dev->dev_private;
struct nouveau_pm_voltage *volt = &dev_priv->engine.pm.voltage;
int i, best = -1;
if (volt_max < volt_min) {
NV_WARN(dev, "volt_max %d < volt_min %d\n", volt_min, volt_max);
volt_max = volt_min;
}
if (volt_min == volt_max)
volt_max = volt_min + 500;

for (i = 0; i < volt->nr_level; i++) {
if (volt->level[i].voltage < volt_min ||
volt->level[i].voltage > volt_max)
continue;
if (best < 0 ||
volt->level[i].voltage < volt->level[best].voltage)
best = i;
}
if (best >= 0)
return volt->level[best].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;
case 0x40:
headerlen = volt[1];
recordlen = volt[2];
entries = volt[3]; /* not a clue what the entries are for.. */
vidmask = volt[11]; /* guess.. */
vidshift = 0;
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->version = volt[0];
if (voltage->version < 0x40) {
voltage->nr_level = entries;
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] * 10000;
voltage->level[i].vid = entry[1] >> vidshift;
}
} else {
u32 volt_uv = ROM32(volt[4]);
s16 step_uv = ROM16(volt[8]);
u8 vid;

voltage->nr_level = voltage->vid_mask + 1;
voltage->level = kcalloc(voltage->nr_level,
sizeof(*voltage->level), GFP_KERNEL);
if (!voltage->level)
return;

for (vid = 0; vid <= voltage->vid_mask; vid++) {
voltage->level[vid].voltage = volt_uv;
voltage->level[vid].vid = vid;
volt_uv += step_uv;
}
}

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);
}
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