system76-coreboot/src/northbridge/intel/nehalem/gma.c

/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2011 Chromium OS Authors
 * Copyright (C) 2013 Vladimir Serbinenko
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <arch/io.h>
#include <device/mmio.h>
#include <console/console.h>
#include <delay.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include <device/pci_ops.h>
#include <drivers/intel/gma/edid.h>
#include <drivers/intel/gma/i915.h>
#include <drivers/intel/gma/intel_bios.h>
#include <drivers/intel/gma/libgfxinit.h>
#include <pc80/vga.h>
#include <pc80/vga_io.h>
#include <southbridge/intel/ibexpeak/nvs.h>
#include <drivers/intel/gma/opregion.h>
#include <cbmem.h>
#include <types.h>

#include "chip.h"
#include "nehalem.h"

/* some vga option roms are used for several chipsets but they only have one
 * PCI ID in their header. If we encounter such an option rom, we need to do
 * the mapping ourselves
 */

u32 map_oprom_vendev(u32 vendev)
{
	u32 new_vendev = vendev;

	/* none currently. */

	return new_vendev;
}

static struct resource *gtt_res = NULL;

u32 gtt_read(u32 reg)
{
	return read32(res2mmio(gtt_res, reg, 0));
}

void gtt_write(u32 reg, u32 data)
{
	write32(res2mmio(gtt_res, reg, 0), data);
}

#define GTT_RETRY 1000
int gtt_poll(u32 reg, u32 mask, u32 value)
{
	unsigned try = GTT_RETRY;
	u32 data;

	while (try--) {
		data = gtt_read(reg);
		if ((data & mask) == value)
			return 1;
		udelay(10);
	}

	printk(BIOS_ERR, "GT init timeout\n");
	return 0;
}

uintptr_t gma_get_gnvs_aslb(const void *gnvs)
{
	const global_nvs_t *gnvs_ptr = gnvs;
	return (uintptr_t)(gnvs_ptr ? gnvs_ptr->aslb : 0);
}

void gma_set_gnvs_aslb(void *gnvs, uintptr_t aslb)
{
	global_nvs_t *gnvs_ptr = gnvs;
	if (gnvs_ptr)
		gnvs_ptr->aslb = aslb;
}

static void gma_pm_init_post_vbios(struct device *dev)
{
	struct northbridge_intel_nehalem_config *conf = dev->chip_info;
	u32 reg32;

	printk(BIOS_DEBUG, "GT Power Management Init (post VBIOS)\n");

	/* Setup Digital Port Hotplug */
	reg32 = gtt_read(0xc4030);
	if (!reg32) {
		reg32 = (conf->gpu_dp_b_hotplug & 0x7) << 2;
		reg32 |= (conf->gpu_dp_c_hotplug & 0x7) << 10;
		reg32 |= (conf->gpu_dp_d_hotplug & 0x7) << 18;
		gtt_write(0xc4030, reg32);
	}

	/* Setup Panel Power On Delays */
	reg32 = gtt_read(0xc7208);
	if (!reg32) {
		reg32 = (conf->gpu_panel_port_select & 0x3) << 30;
		reg32 |= (conf->gpu_panel_power_up_delay & 0x1fff) << 16;
		reg32 |= (conf->gpu_panel_power_backlight_on_delay & 0x1fff);
		gtt_write(0xc7208, reg32);
	}

	/* Setup Panel Power Off Delays */
	reg32 = gtt_read(0xc720c);
	if (!reg32) {
		reg32 = (conf->gpu_panel_power_down_delay & 0x1fff) << 16;
		reg32 |= (conf->gpu_panel_power_backlight_off_delay & 0x1fff);
		gtt_write(0xc720c, reg32);
	}

	/* Setup Panel Power Cycle Delay */
	if (conf->gpu_panel_power_cycle_delay) {
		reg32 = gtt_read(0xc7210);
		reg32 &= ~0xff;
		reg32 |= conf->gpu_panel_power_cycle_delay & 0xff;
		gtt_write(0xc7210, reg32);
	}

	/* Enable Backlight if needed */
	if (conf->gpu_cpu_backlight) {
		gtt_write(0x48250, (1 << 31));
		gtt_write(0x48254, conf->gpu_cpu_backlight);
	}
	if (conf->gpu_pch_backlight) {
		gtt_write(0xc8250, (1 << 31));
		gtt_write(0xc8254, conf->gpu_pch_backlight);
	}
}

/* Enable SCI to ACPI _GPE._L06 */
static void gma_enable_swsci(void)
{
	u16 reg16;

	/* clear DMISCI status */
	reg16 = inw(DEFAULT_PMBASE + TCO1_STS);
	reg16 &= DMISCI_STS;
	outw(DEFAULT_PMBASE + TCO1_STS, reg16);

	/* clear acpi tco status */
	outl(DEFAULT_PMBASE + GPE0_STS, TCOSCI_STS);

	/* enable acpi tco scis */
	reg16 = inw(DEFAULT_PMBASE + GPE0_EN);
	reg16 |= TCOSCI_EN;
	outw(DEFAULT_PMBASE + GPE0_EN, reg16);
}

static void gma_func0_init(struct device *dev)
{
	u32 reg32;

	/* IGD needs to be Bus Master */
	reg32 = pci_read_config32(dev, PCI_COMMAND);
	reg32 |= PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY | PCI_COMMAND_IO;
	pci_write_config32(dev, PCI_COMMAND, reg32);

	gtt_res = find_resource(dev, PCI_BASE_ADDRESS_0);
	if (!gtt_res || !gtt_res->base)
		return;

	if (CONFIG(MAINBOARD_USE_LIBGFXINIT)) {
		struct northbridge_intel_nehalem_config *conf = dev->chip_info;
		int lightup_ok;
		printk(BIOS_SPEW, "Initializing VGA without OPROM.");

		gma_gfxinit(&lightup_ok);
		/* Linux relies on VBT for panel info. */
		generate_fake_intel_oprom(&conf->gfx, dev,
					  "$VBT IRONLAKE-MOBILE");
	} else {
		/* PCI Init, will run VBIOS */
		pci_dev_init(dev);
	}

	/* Post VBIOS init */
	gma_pm_init_post_vbios(dev);

	gma_enable_swsci();
	intel_gma_restore_opregion();
}

static void gma_read_resources(struct device *dev)
{
	pci_dev_read_resources(dev);

	struct resource *res;

	/* Set the graphics memory to write combining. */
	res = find_resource(dev, PCI_BASE_ADDRESS_2);
	if (res == NULL) {
		printk(BIOS_DEBUG, "gma: memory resource not found.\n");
		return;
	}
	res->flags |= IORESOURCE_RESERVE | IORESOURCE_FIXED | IORESOURCE_ASSIGNED;
	pci_write_config32(dev, PCI_BASE_ADDRESS_2, 0xd0000001);
	pci_write_config32(dev, PCI_BASE_ADDRESS_2 + 4, 0);
	res->base = (resource_t) 0xd0000000;
	res->size = (resource_t) 0x10000000;
}

const struct i915_gpu_controller_info *
intel_gma_get_controller_info(void)
{
	struct device *dev = pcidev_on_root(0x2, 0);
	if (!dev) {
		return NULL;
	}
	struct northbridge_intel_nehalem_config *chip = dev->chip_info;
	return &chip->gfx;
}

static void gma_ssdt(struct device *device)
{
	const struct i915_gpu_controller_info *gfx = intel_gma_get_controller_info();
	if (!gfx) {
		return;
	}

	drivers_intel_gma_displays_ssdt_generate(gfx);
}

static unsigned long
gma_write_acpi_tables(struct device *const dev,
		      unsigned long current,
		      struct acpi_rsdp *const rsdp)
{
	igd_opregion_t *opregion = (igd_opregion_t *)current;
	global_nvs_t *gnvs;

	if (intel_gma_init_igd_opregion(opregion) != CB_SUCCESS)
		return current;

	current += sizeof(igd_opregion_t);

	/* GNVS has been already set up */
	gnvs = cbmem_find(CBMEM_ID_ACPI_GNVS);
	if (gnvs) {
		/* IGD OpRegion Base Address */
		gma_set_gnvs_aslb(gnvs, (uintptr_t)opregion);
	} else {
		printk(BIOS_ERR, "Error: GNVS table not found.\n");
	}

	current = acpi_align_current(current);
	return current;
}

static struct pci_operations gma_pci_ops = {
	.set_subsystem = pci_dev_set_subsystem,
};

static struct device_operations gma_func0_ops = {
	.read_resources = gma_read_resources,
	.set_resources = pci_dev_set_resources,
	.enable_resources = pci_dev_enable_resources,
	.acpi_fill_ssdt_generator = gma_ssdt,
	.init = gma_func0_init,
	.scan_bus = 0,
	.enable = 0,
	.ops_pci = &gma_pci_ops,
	.write_acpi_tables	= gma_write_acpi_tables,
};

static const unsigned short pci_device_ids[] = {
	0x0046, 0x0102, 0x0106, 0x010a, 0x0112,
	0x0116, 0x0122, 0x0126, 0x0156,
	0x0166,
	0
};

static const struct pci_driver gma __pci_driver = {
	.ops = &gma_func0_ops,
	.vendor = PCI_VENDOR_ID_INTEL,
	.devices = pci_device_ids,
};