drivers/gpu/drm/nouveau/nouveau_volt.c - kernel/msm-4.9 - Gitiles

 /*
  * 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 <drm/drmP.h>

 #include "nouveau_drm.h"
 #include "nouveau_pm.h"

 #include <subdev/bios/gpio.h>
 #include <subdev/gpio.h>

 static const enum dcb_gpio_func_name 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 nouveau_pm_voltage *volt = &nouveau_pm(dev)->voltage;
 	struct nouveau_device *device = nouveau_dev(dev);
 	struct nouveau_gpio *gpio = nouveau_gpio(device);
 	u8 vid = 0;
 	int i;

 	for (i = 0; i < nr_vidtag; i++) {
 		if (!(volt->vid_mask & (1 << i)))
 			continue;

 		vid |= gpio->get(gpio, 0, vidtag[i], 0xff) << i;
 	}

 	return nouveau_volt_lvl_lookup(dev, vid);
 }

 int
 nouveau_voltage_gpio_set(struct drm_device *dev, int voltage)
 {
 	struct nouveau_device *device = nouveau_dev(dev);
 	struct nouveau_gpio *gpio = nouveau_gpio(device);
 	struct nouveau_pm_voltage *volt = &nouveau_pm(dev)->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(gpio, 0, vidtag[i], 0xff, !!(vid & (1 << i)));
 	}

 	return 0;
 }

 int
 nouveau_volt_vid_lookup(struct drm_device *dev, int voltage)
 {
 	struct nouveau_pm_voltage *volt = &nouveau_pm(dev)->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 nouveau_pm_voltage *volt = &nouveau_pm(dev)->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 nouveau_drm *drm = nouveau_drm(dev);
 	struct nouveau_gpio *gpio = nouveau_gpio(drm->device);
 	struct nouveau_pm *pm = nouveau_pm(dev);
 	struct nouveau_pm_voltage *voltage = &pm->voltage;
 	struct nvbios *bios = &drm->vbios;
 	struct dcb_gpio_func func;
 	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(dev, P.data[16]);
 		else
 		if (P.version == 2)
 			volt = ROMPTR(dev, P.data[12]);
 		else {
 			NV_WARN(drm, "unknown volt for BIT P %d\n", P.version);
 		}
 	} else {
 		if (bios->data[bios->offset + 6] < 0x27) {
 			NV_DEBUG(drm, "BMP version too old for voltage\n");
 			return;
 		}

 		volt = ROMPTR(dev, bios->data[bios->offset + 0x98]);
 	}

 	if (!volt) {
 		NV_DEBUG(drm, "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(drm, "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(drm, "vid bit %d unknown\n", i);
 			return;
 		}

 		if (gpio && gpio->find(gpio, 0, vidtag[i], 0xff, &func)) {
 			NV_DEBUG(drm, "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 nouveau_pm_voltage *volt = &nouveau_pm(dev)->voltage;

 	kfree(volt->level);
 }
	/*
	* 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 <drm/drmP.h>

	#include "nouveau_drm.h"
	#include "nouveau_pm.h"

	#include <subdev/bios/gpio.h>
	#include <subdev/gpio.h>

	static const enum dcb_gpio_func_name 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 nouveau_pm_voltage *volt = &nouveau_pm(dev)->voltage;
	struct nouveau_device *device = nouveau_dev(dev);
	struct nouveau_gpio *gpio = nouveau_gpio(device);
	u8 vid = 0;
	int i;

	for (i = 0; i < nr_vidtag; i++) {
	if (!(volt->vid_mask & (1 << i)))
	continue;

	vid \|= gpio->get(gpio, 0, vidtag[i], 0xff) << i;
	}

	return nouveau_volt_lvl_lookup(dev, vid);
	}

	int
	nouveau_voltage_gpio_set(struct drm_device *dev, int voltage)
	{
	struct nouveau_device *device = nouveau_dev(dev);
	struct nouveau_gpio *gpio = nouveau_gpio(device);
	struct nouveau_pm_voltage *volt = &nouveau_pm(dev)->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(gpio, 0, vidtag[i], 0xff, !!(vid & (1 << i)));
	}

	return 0;
	}

	int
	nouveau_volt_vid_lookup(struct drm_device *dev, int voltage)
	{
	struct nouveau_pm_voltage *volt = &nouveau_pm(dev)->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 nouveau_pm_voltage *volt = &nouveau_pm(dev)->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 nouveau_drm *drm = nouveau_drm(dev);
	struct nouveau_gpio *gpio = nouveau_gpio(drm->device);
	struct nouveau_pm *pm = nouveau_pm(dev);
	struct nouveau_pm_voltage *voltage = &pm->voltage;
	struct nvbios *bios = &drm->vbios;
	struct dcb_gpio_func func;
	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(dev, P.data[16]);
	else
	if (P.version == 2)
	volt = ROMPTR(dev, P.data[12]);
	else {
	NV_WARN(drm, "unknown volt for BIT P %d\n", P.version);
	}
	} else {
	if (bios->data[bios->offset + 6] < 0x27) {
	NV_DEBUG(drm, "BMP version too old for voltage\n");
	return;
	}

	volt = ROMPTR(dev, bios->data[bios->offset + 0x98]);
	}

	if (!volt) {
	NV_DEBUG(drm, "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(drm, "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(drm, "vid bit %d unknown\n", i);
	return;
	}

	if (gpio && gpio->find(gpio, 0, vidtag[i], 0xff, &func)) {
	NV_DEBUG(drm, "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 nouveau_pm_voltage *volt = &nouveau_pm(dev)->voltage;

	kfree(volt->level);
	}