a2071101ae
Add a driver for laptops with NVIDIA Optimus (hybrid) graphics. The driver provides ACPI support for dynamically powering on and off the GPU, NVIDIA Dynamic Boost support, and a function for enabling the GPU power in romstage. References: - DG-09845-001: NVIDIA GN20/QN20 Hardware Design Guide - DG-09954-001: NVIDIA GN20/QN20 Software Design Guide Change-Id: I2dec7aa2c8db7994f78a7cc1220502676e248465 Signed-off-by: Jeremy Soller <jeremy@system76.com> Signed-off-by: Tim Crawford <tcrawford@system76.com>
72 lines
1.9 KiB
C
72 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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#include "chip.h"
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#include <console/console.h>
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#include <device/device.h>
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#include <device/pci.h>
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#include <device/pci_ids.h>
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#define NVIDIA_SUBSYSTEM_ID_OFFSET 0x40
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static void nvidia_read_resources(struct device *dev)
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{
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printk(BIOS_DEBUG, "%s: %s\n", __func__, dev_path(dev));
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pci_dev_read_resources(dev);
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// Find all BARs on GPU, mark them above 4g if prefetchable
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for (int bar = PCI_BASE_ADDRESS_0; bar <= PCI_BASE_ADDRESS_5; bar += 4) {
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struct resource *res = probe_resource(dev, bar);
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if (res) {
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if (res->flags & IORESOURCE_PREFETCH) {
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printk(BIOS_INFO, " BAR at 0x%02x marked above 4g\n", bar);
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res->flags |= IORESOURCE_ABOVE_4G;
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} else {
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printk(BIOS_DEBUG, " BAR at 0x%02x not prefetch\n", bar);
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}
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} else {
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printk(BIOS_DEBUG, " BAR at 0x%02x not found\n", bar);
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}
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}
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}
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static void nvidia_set_subsystem(struct device *dev, unsigned int vendor, unsigned int device)
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{
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pci_write_config32(dev, NVIDIA_SUBSYSTEM_ID_OFFSET,
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((device & 0xffff) << 16) | (vendor & 0xffff));
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}
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static struct pci_operations nvidia_device_ops_pci = {
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.set_subsystem = nvidia_set_subsystem,
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};
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static struct device_operations nvidia_device_ops = {
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.read_resources = nvidia_read_resources,
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.set_resources = pci_dev_set_resources,
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.enable_resources = pci_dev_enable_resources,
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#if CONFIG(HAVE_ACPI_TABLES)
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.write_acpi_tables = pci_rom_write_acpi_tables,
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.acpi_fill_ssdt = pci_rom_ssdt,
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#endif
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.init = pci_dev_init,
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.ops_pci = &nvidia_device_ops_pci,
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};
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static void nvidia_enable(struct device *dev)
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{
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if (!is_dev_enabled(dev) || dev->path.type != DEVICE_PATH_PCI)
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return;
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if (pci_read_config16(dev, PCI_VENDOR_ID) != PCI_VID_NVIDIA)
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return;
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dev->ops = &nvidia_device_ops;
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}
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struct chip_operations drivers_gfx_nvidia_ops = {
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.name = "NVIDIA Optimus Graphics Device",
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.enable_dev = nvidia_enable
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};
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