/*
* 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 guid_t muid =
GUID_INIT(0x4004A400, 0x917D, 0x4CF2,
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, enum nvkm_subdev_type type, int inst,
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, type, inst, &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);
nvkm_debug(&mxm->subdev, "module flags: %02x\n",
nvbios_rd08(bios, data + 0x01));
nvkm_debug(&mxm->subdev, "config flags: %02x\n",
nvbios_rd08(bios, data + 0x02));
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;
}
Codebase Browser
linux