1 files changed, 274 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..51fcf7960417
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/mxm/base.c
@@ -0,0 +1,274 @@
+/*
+ * 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 <core/option.h>
+
+#include <subdev/i2c.h>
+#include <subdev/mxm.h>
+#include <subdev/bios.h>
+#include <subdev/bios/mxm.h>
+
+#include "mxms.h"
+
+static bool
+mxm_shadow_rom_fetch(struct nouveau_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 nouveau_mxm *mxm, u8 version)
+{
+        struct nouveau_bios *bios = nouveau_bios(mxm);
+        struct nouveau_i2c *i2c = nouveau_i2c(mxm);
+        struct nouveau_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 nouveau_mxm *mxm, u8 version)
+{
+        struct nouveau_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 nouveau_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 nouveau_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 nouveau_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 nouveau_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
+nouveau_mxm_create_(struct nouveau_object *parent,
+                    struct nouveau_object *engine,
+                    struct nouveau_oclass *oclass, int length, void **pobject)
+{
+        struct nouveau_device *device = nv_device(parent);
+        struct nouveau_bios *bios = nouveau_bios(device);
+        struct nouveau_mxm *mxm;
+        u8  ver, len;
+        u16 data;
+        int ret;
+
+        ret = nouveau_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 (nouveau_boolopt(device->cfgopt, "NvMXMDCB", true))
+                mxm->action |= MXM_SANITISE_DCB;
+        return 0;
+}