drivers/gpu/drm/nouveau/nvkm/subdev/mxm/base.c - linux-imx - Git at Google

 /*
  * Copyright 2011 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 "mxms.h"

 #include <core/option.h>
 #include <subdev/bios.h>
 #include <subdev/bios/mxm.h>
 #include <subdev/i2c.h>

 static bool
 mxm_shadow_rom_fetch(struct nvkm_i2c_bus *bus, u8 addr,
 		     u8 offset, u8 size, u8 *data)
 {
 	struct i2c_msg msgs[] = {
 		{ .addr = addr, .flags = 0, .len = 1, .buf = &offset },
 		{ .addr = addr, .flags = I2C_M_RD, .len = size, .buf = data, },
 	};

 	return i2c_transfer(&bus->i2c, msgs, 2) == 2;
 }

 static bool
 mxm_shadow_rom(struct nvkm_mxm *mxm, u8 version)
 {
 	struct nvkm_device *device = mxm->subdev.device;
 	struct nvkm_bios *bios = device->bios;
 	struct nvkm_i2c *i2c = device->i2c;
 	struct nvkm_i2c_bus *bus = NULL;
 	u8 i2cidx, mxms[6], addr, size;

 	i2cidx = mxm_ddc_map(bios, 1 /* LVDS_DDC */) & 0x0f;
 	if (i2cidx < 0x0f)
 		bus = nvkm_i2c_bus_find(i2c, i2cidx);
 	if (!bus)
 		return false;

 	addr = 0x54;
 	if (!mxm_shadow_rom_fetch(bus, addr, 0, 6, mxms)) {
 		addr = 0x56;
 		if (!mxm_shadow_rom_fetch(bus, addr, 0, 6, mxms))
 			return false;
 	}

 	mxm->mxms = mxms;
 	size = mxms_headerlen(mxm) + mxms_structlen(mxm);
 	mxm->mxms = kmalloc(size, GFP_KERNEL);

 	if (mxm->mxms &&
 	    mxm_shadow_rom_fetch(bus, addr, 0, size, mxm->mxms))
 		return true;

 	kfree(mxm->mxms);
 	mxm->mxms = NULL;
 	return false;
 }

 #if defined(CONFIG_ACPI)
 static bool
 mxm_shadow_dsm(struct nvkm_mxm *mxm, u8 version)
 {
 	struct nvkm_subdev *subdev = &mxm->subdev;
 	struct nvkm_device *device = subdev->device;
 	static char muid[] = {
 		0x00, 0xA4, 0x04, 0x40, 0x7D, 0x91, 0xF2, 0x4C,
 		0xB8, 0x9C, 0x79, 0xB6, 0x2F, 0xD5, 0x56, 0x65
 	};
 	u32 mxms_args[] = { 0x00000000 };
 	union acpi_object argv4 = {
 		.buffer.type = ACPI_TYPE_BUFFER,
 		.buffer.length = sizeof(mxms_args),
 		.buffer.pointer = (char *)mxms_args,
 	};
 	union acpi_object *obj;
 	acpi_handle handle;
 	int rev;

 	handle = ACPI_HANDLE(device->dev);
 	if (!handle)
 		return false;

 	/*
 	 * spec says this can be zero to mean "highest revision", but
 	 * of course there's at least one bios out there which fails
 	 * unless you pass in exactly the version it supports..
 	 */
 	rev = (version & 0xf0) << 4 | (version & 0x0f);
 	obj = acpi_evaluate_dsm(handle, muid, rev, 0x00000010, &argv4);
 	if (!obj) {
 		nvkm_debug(subdev, "DSM MXMS failed\n");
 		return false;
 	}

 	if (obj->type == ACPI_TYPE_BUFFER) {
 		mxm->mxms = kmemdup(obj->buffer.pointer,
 					 obj->buffer.length, GFP_KERNEL);
 	} else if (obj->type == ACPI_TYPE_INTEGER) {
 		nvkm_debug(subdev, "DSM MXMS returned 0x%llx\n",
 			   obj->integer.value);
 	}

 	ACPI_FREE(obj);
 	return mxm->mxms != NULL;
 }
 #endif

 #if defined(CONFIG_ACPI_WMI) || defined(CONFIG_ACPI_WMI_MODULE)

 #define WMI_WMMX_GUID "F6CB5C3C-9CAE-4EBD-B577-931EA32A2CC0"

 static u8
 wmi_wmmx_mxmi(struct nvkm_mxm *mxm, u8 version)
 {
 	struct nvkm_subdev *subdev = &mxm->subdev;
 	u32 mxmi_args[] = { 0x494D584D /* MXMI */, version, 0 };
 	struct acpi_buffer args = { sizeof(mxmi_args), mxmi_args };
 	struct acpi_buffer retn = { ACPI_ALLOCATE_BUFFER, NULL };
 	union acpi_object *obj;
 	acpi_status status;

 	status = wmi_evaluate_method(WMI_WMMX_GUID, 0, 0, &args, &retn);
 	if (ACPI_FAILURE(status)) {
 		nvkm_debug(subdev, "WMMX MXMI returned %d\n", status);
 		return 0x00;
 	}

 	obj = retn.pointer;
 	if (obj->type == ACPI_TYPE_INTEGER) {
 		version = obj->integer.value;
 		nvkm_debug(subdev, "WMMX MXMI version %d.%d\n",
 			   (version >> 4), version & 0x0f);
 	} else {
 		version = 0;
 		nvkm_debug(subdev, "WMMX MXMI returned non-integer\n");
 	}

 	kfree(obj);
 	return version;
 }

 static bool
 mxm_shadow_wmi(struct nvkm_mxm *mxm, u8 version)
 {
 	struct nvkm_subdev *subdev = &mxm->subdev;
 	u32 mxms_args[] = { 0x534D584D /* MXMS */, version, 0 };
 	struct acpi_buffer args = { sizeof(mxms_args), mxms_args };
 	struct acpi_buffer retn = { ACPI_ALLOCATE_BUFFER, NULL };
 	union acpi_object *obj;
 	acpi_status status;

 	if (!wmi_has_guid(WMI_WMMX_GUID)) {
 		nvkm_debug(subdev, "WMMX GUID not found\n");
 		return false;
 	}

 	mxms_args[1] = wmi_wmmx_mxmi(mxm, 0x00);
 	if (!mxms_args[1])
 		mxms_args[1] = wmi_wmmx_mxmi(mxm, version);
 	if (!mxms_args[1])
 		return false;

 	status = wmi_evaluate_method(WMI_WMMX_GUID, 0, 0, &args, &retn);
 	if (ACPI_FAILURE(status)) {
 		nvkm_debug(subdev, "WMMX MXMS returned %d\n", status);
 		return false;
 	}

 	obj = retn.pointer;
 	if (obj->type == ACPI_TYPE_BUFFER) {
 		mxm->mxms = kmemdup(obj->buffer.pointer,
 				    obj->buffer.length, GFP_KERNEL);
 	}

 	kfree(obj);
 	return mxm->mxms != NULL;
 }
 #endif

 static struct mxm_shadow_h {
 	const char *name;
 	bool (*exec)(struct nvkm_mxm *, u8 version);
 } _mxm_shadow[] = {
 	{ "ROM", mxm_shadow_rom },
 #if defined(CONFIG_ACPI)
 	{ "DSM", mxm_shadow_dsm },
 #endif
 #if defined(CONFIG_ACPI_WMI) || defined(CONFIG_ACPI_WMI_MODULE)
 	{ "WMI", mxm_shadow_wmi },
 #endif
 	{}
 };

 static int
 mxm_shadow(struct nvkm_mxm *mxm, u8 version)
 {
 	struct mxm_shadow_h *shadow = _mxm_shadow;
 	do {
 		nvkm_debug(&mxm->subdev, "checking %s\n", shadow->name);
 		if (shadow->exec(mxm, version)) {
 			if (mxms_valid(mxm))
 				return 0;
 			kfree(mxm->mxms);
 			mxm->mxms = NULL;
 		}
 	} while ((++shadow)->name);
 	return -ENOENT;
 }

 static const struct nvkm_subdev_func
 nvkm_mxm = {
 };

 int
 nvkm_mxm_new_(struct nvkm_device *device, int index, struct nvkm_mxm **pmxm)
 {
 	struct nvkm_bios *bios = device->bios;
 	struct nvkm_mxm *mxm;
 	u8  ver, len;
 	u16 data;

 	if (!(mxm = *pmxm = kzalloc(sizeof(*mxm), GFP_KERNEL)))
 		return -ENOMEM;

 	nvkm_subdev_ctor(&nvkm_mxm, device, index, &mxm->subdev);

 	data = mxm_table(bios, &ver, &len);
 	if (!data || !(ver = nvbios_rd08(bios, data))) {
 		nvkm_debug(&mxm->subdev, "no VBIOS data, nothing to do\n");
 		return 0;
 	}

 	nvkm_info(&mxm->subdev, "BIOS version %d.%d\n", ver >> 4, ver & 0x0f);

 	if (mxm_shadow(mxm, ver)) {
 		nvkm_warn(&mxm->subdev, "failed to locate valid SIS\n");
 #if 0
 		/* we should, perhaps, fall back to some kind of limited
 		 * mode here if the x86 vbios hasn't already done the
 		 * work for us (so we prevent loading with completely
 		 * whacked vbios tables).
 		 */
 		return -EINVAL;
 #else
 		return 0;
 #endif
 	}

 	nvkm_debug(&mxm->subdev, "MXMS Version %d.%d\n",
 		   mxms_version(mxm) >> 8, mxms_version(mxm) & 0xff);
 	mxms_foreach(mxm, 0, NULL, NULL);

 	if (nvkm_boolopt(device->cfgopt, "NvMXMDCB", true))
 		mxm->action |= MXM_SANITISE_DCB;
 	return 0;
 }
	/*
	* Copyright 2011 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 "mxms.h"

	#include <core/option.h>
	#include <subdev/bios.h>
	#include <subdev/bios/mxm.h>
	#include <subdev/i2c.h>

	static bool
	mxm_shadow_rom_fetch(struct nvkm_i2c_bus *bus, u8 addr,
	u8 offset, u8 size, u8 *data)
	{
	struct i2c_msg msgs[] = {
	{ .addr = addr, .flags = 0, .len = 1, .buf = &offset },
	{ .addr = addr, .flags = I2C_M_RD, .len = size, .buf = data, },
	};

	return i2c_transfer(&bus->i2c, msgs, 2) == 2;
	}

	static bool
	mxm_shadow_rom(struct nvkm_mxm *mxm, u8 version)
	{
	struct nvkm_device *device = mxm->subdev.device;
	struct nvkm_bios *bios = device->bios;
	struct nvkm_i2c *i2c = device->i2c;
	struct nvkm_i2c_bus *bus = NULL;
	u8 i2cidx, mxms[6], addr, size;

	i2cidx = mxm_ddc_map(bios, 1 /* LVDS_DDC */) & 0x0f;
	if (i2cidx < 0x0f)
	bus = nvkm_i2c_bus_find(i2c, i2cidx);
	if (!bus)
	return false;

	addr = 0x54;
	if (!mxm_shadow_rom_fetch(bus, addr, 0, 6, mxms)) {
	addr = 0x56;
	if (!mxm_shadow_rom_fetch(bus, addr, 0, 6, mxms))
	return false;
	}

	mxm->mxms = mxms;
	size = mxms_headerlen(mxm) + mxms_structlen(mxm);
	mxm->mxms = kmalloc(size, GFP_KERNEL);

	if (mxm->mxms &&
	mxm_shadow_rom_fetch(bus, addr, 0, size, mxm->mxms))
	return true;

	kfree(mxm->mxms);
	mxm->mxms = NULL;
	return false;
	}

	#if defined(CONFIG_ACPI)
	static bool
	mxm_shadow_dsm(struct nvkm_mxm *mxm, u8 version)
	{
	struct nvkm_subdev *subdev = &mxm->subdev;
	struct nvkm_device *device = subdev->device;
	static char muid[] = {
	0x00, 0xA4, 0x04, 0x40, 0x7D, 0x91, 0xF2, 0x4C,
	0xB8, 0x9C, 0x79, 0xB6, 0x2F, 0xD5, 0x56, 0x65
	};
	u32 mxms_args[] = { 0x00000000 };
	union acpi_object argv4 = {
	.buffer.type = ACPI_TYPE_BUFFER,
	.buffer.length = sizeof(mxms_args),
	.buffer.pointer = (char *)mxms_args,
	};
	union acpi_object *obj;
	acpi_handle handle;
	int rev;

	handle = ACPI_HANDLE(device->dev);
	if (!handle)
	return false;

	/*
	* spec says this can be zero to mean "highest revision", but
	* of course there's at least one bios out there which fails
	* unless you pass in exactly the version it supports..
	*/
	rev = (version & 0xf0) << 4 \| (version & 0x0f);
	obj = acpi_evaluate_dsm(handle, muid, rev, 0x00000010, &argv4);
	if (!obj) {
	nvkm_debug(subdev, "DSM MXMS failed\n");
	return false;
	}

	if (obj->type == ACPI_TYPE_BUFFER) {
	mxm->mxms = kmemdup(obj->buffer.pointer,
	obj->buffer.length, GFP_KERNEL);
	} else if (obj->type == ACPI_TYPE_INTEGER) {
	nvkm_debug(subdev, "DSM MXMS returned 0x%llx\n",
	obj->integer.value);
	}

	ACPI_FREE(obj);
	return mxm->mxms != NULL;
	}
	#endif

	#if defined(CONFIG_ACPI_WMI) \|\| defined(CONFIG_ACPI_WMI_MODULE)

	#define WMI_WMMX_GUID "F6CB5C3C-9CAE-4EBD-B577-931EA32A2CC0"

	static u8
	wmi_wmmx_mxmi(struct nvkm_mxm *mxm, u8 version)
	{
	struct nvkm_subdev *subdev = &mxm->subdev;
	u32 mxmi_args[] = { 0x494D584D /* MXMI */, version, 0 };
	struct acpi_buffer args = { sizeof(mxmi_args), mxmi_args };
	struct acpi_buffer retn = { ACPI_ALLOCATE_BUFFER, NULL };
	union acpi_object *obj;
	acpi_status status;

	status = wmi_evaluate_method(WMI_WMMX_GUID, 0, 0, &args, &retn);
	if (ACPI_FAILURE(status)) {
	nvkm_debug(subdev, "WMMX MXMI returned %d\n", status);
	return 0x00;
	}

	obj = retn.pointer;
	if (obj->type == ACPI_TYPE_INTEGER) {
	version = obj->integer.value;
	nvkm_debug(subdev, "WMMX MXMI version %d.%d\n",
	(version >> 4), version & 0x0f);
	} else {
	version = 0;
	nvkm_debug(subdev, "WMMX MXMI returned non-integer\n");
	}

	kfree(obj);
	return version;
	}

	static bool
	mxm_shadow_wmi(struct nvkm_mxm *mxm, u8 version)
	{
	struct nvkm_subdev *subdev = &mxm->subdev;
	u32 mxms_args[] = { 0x534D584D /* MXMS */, version, 0 };
	struct acpi_buffer args = { sizeof(mxms_args), mxms_args };
	struct acpi_buffer retn = { ACPI_ALLOCATE_BUFFER, NULL };
	union acpi_object *obj;
	acpi_status status;

	if (!wmi_has_guid(WMI_WMMX_GUID)) {
	nvkm_debug(subdev, "WMMX GUID not found\n");
	return false;
	}

	mxms_args[1] = wmi_wmmx_mxmi(mxm, 0x00);
	if (!mxms_args[1])
	mxms_args[1] = wmi_wmmx_mxmi(mxm, version);
	if (!mxms_args[1])
	return false;

	status = wmi_evaluate_method(WMI_WMMX_GUID, 0, 0, &args, &retn);
	if (ACPI_FAILURE(status)) {
	nvkm_debug(subdev, "WMMX MXMS returned %d\n", status);
	return false;
	}

	obj = retn.pointer;
	if (obj->type == ACPI_TYPE_BUFFER) {
	mxm->mxms = kmemdup(obj->buffer.pointer,
	obj->buffer.length, GFP_KERNEL);
	}

	kfree(obj);
	return mxm->mxms != NULL;
	}
	#endif

	static struct mxm_shadow_h {
	const char *name;
	bool (exec)(struct nvkm_mxm , u8 version);
	} _mxm_shadow[] = {
	{ "ROM", mxm_shadow_rom },
	#if defined(CONFIG_ACPI)
	{ "DSM", mxm_shadow_dsm },
	#endif
	#if defined(CONFIG_ACPI_WMI) \|\| defined(CONFIG_ACPI_WMI_MODULE)
	{ "WMI", mxm_shadow_wmi },
	#endif
	{}
	};

	static int
	mxm_shadow(struct nvkm_mxm *mxm, u8 version)
	{
	struct mxm_shadow_h *shadow = _mxm_shadow;
	do {
	nvkm_debug(&mxm->subdev, "checking %s\n", shadow->name);
	if (shadow->exec(mxm, version)) {
	if (mxms_valid(mxm))
	return 0;
	kfree(mxm->mxms);
	mxm->mxms = NULL;
	}
	} while ((++shadow)->name);
	return -ENOENT;
	}

	static const struct nvkm_subdev_func
	nvkm_mxm = {
	};

	int
	nvkm_mxm_new_(struct nvkm_device device, int index, struct nvkm_mxm *pmxm)
	{
	struct nvkm_bios *bios = device->bios;
	struct nvkm_mxm *mxm;
	u8 ver, len;
	u16 data;

	if (!(mxm = pmxm = kzalloc(sizeof(mxm), GFP_KERNEL)))
	return -ENOMEM;

	nvkm_subdev_ctor(&nvkm_mxm, device, index, &mxm->subdev);

	data = mxm_table(bios, &ver, &len);
	if (!data \|\| !(ver = nvbios_rd08(bios, data))) {
	nvkm_debug(&mxm->subdev, "no VBIOS data, nothing to do\n");
	return 0;
	}

	nvkm_info(&mxm->subdev, "BIOS version %d.%d\n", ver >> 4, ver & 0x0f);

	if (mxm_shadow(mxm, ver)) {
	nvkm_warn(&mxm->subdev, "failed to locate valid SIS\n");
	#if 0
	/* we should, perhaps, fall back to some kind of limited
	* mode here if the x86 vbios hasn't already done the
	* work for us (so we prevent loading with completely
	* whacked vbios tables).
	*/
	return -EINVAL;
	#else
	return 0;
	#endif
	}

	nvkm_debug(&mxm->subdev, "MXMS Version %d.%d\n",
	mxms_version(mxm) >> 8, mxms_version(mxm) & 0xff);
	mxms_foreach(mxm, 0, NULL, NULL);

	if (nvkm_boolopt(device->cfgopt, "NvMXMDCB", true))
	mxm->action \|= MXM_SANITISE_DCB;
	return 0;
	}