1 files changed, 271 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/mxm/base.c b/drivers/gpu/drm/nouveau/nvkm/subdev/mxm/base.c
new file mode 100644
index 000000000000..0ca9dcabb6d3
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/mxm/base.c
@@ -0,0 +1,271 @@
+/*
+ * 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/device.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_port *i2c, 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(&i2c->adapter, msgs, 2) == 2;
+}
+
+static bool
+mxm_shadow_rom(struct nvkm_mxm *mxm, u8 version)
+{
+	struct nvkm_bios *bios = nvkm_bios(mxm);
+	struct nvkm_i2c *i2c = nvkm_i2c(mxm);
+	struct nvkm_i2c_port *port = NULL;
+	u8 i2cidx, mxms[6], addr, size;
+
+	i2cidx = mxm_ddc_map(bios, 1 /* LVDS_DDC */) & 0x0f;
+	if (i2cidx < 0x0f)
+		port = i2c->find(i2c, i2cidx);
+	if (!port)
+		return false;
+
+	addr = 0x54;
+	if (!mxm_shadow_rom_fetch(port, addr, 0, 6, mxms)) {
+		addr = 0x56;
+		if (!mxm_shadow_rom_fetch(port, 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(port, 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_device *device = nv_device(mxm);
+	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(nv_device_base(device));
+	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) {
+		nv_debug(mxm, "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) {
+		nv_debug(mxm, "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)
+{
+	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)) {
+		nv_debug(mxm, "WMMX MXMI returned %d\n", status);
+		return 0x00;
+	}
+
+	obj = retn.pointer;
+	if (obj->type == ACPI_TYPE_INTEGER) {
+		version = obj->integer.value;
+		nv_debug(mxm, "WMMX MXMI version %d.%d\n",
+			     (version >> 4), version & 0x0f);
+	} else {
+		version = 0;
+		nv_debug(mxm, "WMMX MXMI returned non-integer\n");
+	}
+
+	kfree(obj);
+	return version;
+}
+
+static bool
+mxm_shadow_wmi(struct nvkm_mxm *mxm, u8 version)
+{
+	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)) {
+		nv_debug(mxm, "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)) {
+		nv_debug(mxm, "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 {
+		nv_debug(mxm, "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;
+}
+
+int
+nvkm_mxm_create_(struct nvkm_object *parent, struct nvkm_object *engine,
+		 struct nvkm_oclass *oclass, int length, void **pobject)
+{
+	struct nvkm_device *device = nv_device(parent);
+	struct nvkm_bios *bios = nvkm_bios(device);
+	struct nvkm_mxm *mxm;
+	u8  ver, len;
+	u16 data;
+	int ret;
+
+	ret = nvkm_subdev_create_(parent, engine, oclass, 0, "MXM", "mxm",
+				  length, pobject);
+	mxm = *pobject;
+	if (ret)
+		return ret;
+
+	data = mxm_table(bios, &ver, &len);
+	if (!data || !(ver = nv_ro08(bios, data))) {
+		nv_debug(mxm, "no VBIOS data, nothing to do\n");
+		return 0;
+	}
+
+	nv_info(mxm, "BIOS version %d.%d\n", ver >> 4, ver & 0x0f);
+
+	if (mxm_shadow(mxm, ver)) {
+		nv_info(mxm, "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
+	}
+
+	nv_info(mxm, "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;
+}