kolibrios/drivers/video/drm/radeon/radeon_device.c

/*
 * Copyright 2008 Advanced Micro Devices, Inc.
 * Copyright 2008 Red Hat Inc.
 * Copyright 2009 Jerome Glisse.
 *
 * 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: Dave Airlie
 *          Alex Deucher
 *          Jerome Glisse
 */
//#include <linux/console.h>
#include <linux/slab.h>
#include <drm/drmP.h>
#include <drm/drm_crtc_helper.h>
#include <drm/radeon_drm.h>
#include <linux/vgaarb.h>
#include <linux/vga_switcheroo.h>
#include "radeon_reg.h"
#include "radeon.h"
#include "atom.h"

#include "display.h"


#include <drm/drm_pciids.h>

#define PCI_VENDOR_ID_ATI               0x1002
#define PCI_VENDOR_ID_APPLE             0x106b

int radeon_no_wb;
int radeon_modeset = -1;
int radeon_dynclks = -1;
int radeon_r4xx_atom = 0;
int radeon_agpmode = 0;
int radeon_vram_limit = 0;
int radeon_gart_size = -1; /* auto */
int radeon_benchmarking = 0;
int radeon_testing = 0;
int radeon_connector_table = 0;
int radeon_tv = 1;
int radeon_audio = -1;
int radeon_disp_priority = 0;
int radeon_hw_i2c = 0;
int radeon_pcie_gen2 = -1;
int radeon_msi = -1;
int radeon_lockup_timeout = 10000;
int radeon_fastfb = 0;
int radeon_dpm = -1;
int radeon_aspm = -1;
int radeon_runtime_pm = -1;
int radeon_hard_reset = 0;
int radeon_vm_size = 8;
int radeon_vm_block_size = -1;
int radeon_deep_color = 0;
int radeon_use_pflipirq = 2;
int irq_override = 0;
int radeon_bapm = -1;
int radeon_backlight = 0;
int radeon_auxch = -1;
int radeon_mst = 0;

extern display_t *os_display;
extern struct drm_device *main_device;
extern videomode_t usermode;


void parse_cmdline(char *cmdline, videomode_t *mode, char *log, int *kms);
int init_display(struct radeon_device *rdev, videomode_t *mode);
int init_display_kms(struct drm_device *dev, videomode_t *usermode);

int get_modes(videomode_t *mode, u32 *count);
int set_user_mode(videomode_t *mode);
int r100_2D_test(struct radeon_device *rdev);


 /* Legacy VGA regions */
#define VGA_RSRC_NONE          0x00
#define VGA_RSRC_LEGACY_IO     0x01
#define VGA_RSRC_LEGACY_MEM    0x02
#define VGA_RSRC_LEGACY_MASK   (VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM)
/* Non-legacy access */
#define VGA_RSRC_NORMAL_IO     0x04
#define VGA_RSRC_NORMAL_MEM    0x08


static const char radeon_family_name[][16] = {
	"R100",
	"RV100",
	"RS100",
	"RV200",
	"RS200",
	"R200",
	"RV250",
	"RS300",
	"RV280",
	"R300",
	"R350",
	"RV350",
	"RV380",
	"R420",
	"R423",
	"RV410",
	"RS400",
	"RS480",
	"RS600",
	"RS690",
	"RS740",
	"RV515",
	"R520",
	"RV530",
	"RV560",
	"RV570",
	"R580",
	"R600",
	"RV610",
	"RV630",
	"RV670",
	"RV620",
	"RV635",
	"RS780",
	"RS880",
	"RV770",
	"RV730",
	"RV710",
	"RV740",
	"CEDAR",
	"REDWOOD",
	"JUNIPER",
	"CYPRESS",
	"HEMLOCK",
	"PALM",
	"SUMO",
	"SUMO2",
	"BARTS",
	"TURKS",
	"CAICOS",
	"CAYMAN",
	"ARUBA",
	"TAHITI",
	"PITCAIRN",
	"VERDE",
	"OLAND",
	"HAINAN",
	"BONAIRE",
	"KAVERI",
	"KABINI",
	"HAWAII",
	"MULLINS",
	"LAST",
};

#define RADEON_PX_QUIRK_DISABLE_PX  (1 << 0)
#define RADEON_PX_QUIRK_LONG_WAKEUP (1 << 1)

struct radeon_px_quirk {
	u32 chip_vendor;
	u32 chip_device;
	u32 subsys_vendor;
	u32 subsys_device;
	u32 px_quirk_flags;
};

static struct radeon_px_quirk radeon_px_quirk_list[] = {
	/* Acer aspire 5560g (CPU: AMD A4-3305M; GPU: AMD Radeon HD 6480g + 7470m)
	 * https://bugzilla.kernel.org/show_bug.cgi?id=74551
	 */
	{ PCI_VENDOR_ID_ATI, 0x6760, 0x1025, 0x0672, RADEON_PX_QUIRK_DISABLE_PX },
	/* Asus K73TA laptop with AMD A6-3400M APU and Radeon 6550 GPU
	 * https://bugzilla.kernel.org/show_bug.cgi?id=51381
	 */
	{ PCI_VENDOR_ID_ATI, 0x6741, 0x1043, 0x108c, RADEON_PX_QUIRK_DISABLE_PX },
	/* Asus K53TK laptop with AMD A6-3420M APU and Radeon 7670m GPU
	 * https://bugzilla.kernel.org/show_bug.cgi?id=51381
	 */
	{ PCI_VENDOR_ID_ATI, 0x6840, 0x1043, 0x2122, RADEON_PX_QUIRK_DISABLE_PX },
	/* macbook pro 8.2 */
	{ PCI_VENDOR_ID_ATI, 0x6741, PCI_VENDOR_ID_APPLE, 0x00e2, RADEON_PX_QUIRK_LONG_WAKEUP },
	{ 0, 0, 0, 0, 0 },
};

bool radeon_is_px(struct drm_device *dev)
{
	struct radeon_device *rdev = dev->dev_private;

	if (rdev->flags & RADEON_IS_PX)
		return true;
	return false;
}

static void radeon_device_handle_px_quirks(struct radeon_device *rdev)
{
	struct radeon_px_quirk *p = radeon_px_quirk_list;

	/* Apply PX quirks */
	while (p && p->chip_device != 0) {
		if (rdev->pdev->vendor == p->chip_vendor &&
		    rdev->pdev->device == p->chip_device &&
		    rdev->pdev->subsystem_vendor == p->subsys_vendor &&
		    rdev->pdev->subsystem_device == p->subsys_device) {
			rdev->px_quirk_flags = p->px_quirk_flags;
			break;
		}
		++p;
	}

	if (rdev->px_quirk_flags & RADEON_PX_QUIRK_DISABLE_PX)
		rdev->flags &= ~RADEON_IS_PX;
}

/**
 * radeon_program_register_sequence - program an array of registers.
 *
 * @rdev: radeon_device pointer
 * @registers: pointer to the register array
 * @array_size: size of the register array
 *
 * Programs an array or registers with and and or masks.
 * This is a helper for setting golden registers.
 */
void radeon_program_register_sequence(struct radeon_device *rdev,
				      const u32 *registers,
				      const u32 array_size)
{
	u32 tmp, reg, and_mask, or_mask;
	int i;

	if (array_size % 3)
		return;

	for (i = 0; i < array_size; i +=3) {
		reg = registers[i + 0];
		and_mask = registers[i + 1];
		or_mask = registers[i + 2];

		if (and_mask == 0xffffffff) {
			tmp = or_mask;
		} else {
			tmp = RREG32(reg);
			tmp &= ~and_mask;
			tmp |= or_mask;
		}
		WREG32(reg, tmp);
	}
}

void radeon_pci_config_reset(struct radeon_device *rdev)
{
	pci_write_config_dword(rdev->pdev, 0x7c, RADEON_ASIC_RESET_DATA);
}

/**
 * radeon_surface_init - Clear GPU surface registers.
 *
 * @rdev: radeon_device pointer
 *
 * Clear GPU surface registers (r1xx-r5xx).
 */
void radeon_surface_init(struct radeon_device *rdev)
{
	/* FIXME: check this out */
	if (rdev->family < CHIP_R600) {
		int i;

		for (i = 0; i < RADEON_GEM_MAX_SURFACES; i++) {
			if (rdev->surface_regs[i].bo)
				radeon_bo_get_surface_reg(rdev->surface_regs[i].bo);
			else
				radeon_clear_surface_reg(rdev, i);
		}
		/* enable surfaces */
		WREG32(RADEON_SURFACE_CNTL, 0);
	}
}

/*
 * GPU scratch registers helpers function.
 */
/**
 * radeon_scratch_init - Init scratch register driver information.
 *
 * @rdev: radeon_device pointer
 *
 * Init CP scratch register driver information (r1xx-r5xx)
 */
void radeon_scratch_init(struct radeon_device *rdev)
{
	int i;

	/* FIXME: check this out */
	if (rdev->family < CHIP_R300) {
		rdev->scratch.num_reg = 5;
	} else {
		rdev->scratch.num_reg = 7;
	}
	rdev->scratch.reg_base = RADEON_SCRATCH_REG0;
	for (i = 0; i < rdev->scratch.num_reg; i++) {
		rdev->scratch.free[i] = true;
		rdev->scratch.reg[i] = rdev->scratch.reg_base + (i * 4);
	}
}

/**
 * radeon_scratch_get - Allocate a scratch register
 *
 * @rdev: radeon_device pointer
 * @reg: scratch register mmio offset
 *
 * Allocate a CP scratch register for use by the driver (all asics).
 * Returns 0 on success or -EINVAL on failure.
 */
int radeon_scratch_get(struct radeon_device *rdev, uint32_t *reg)
{
	int i;

	for (i = 0; i < rdev->scratch.num_reg; i++) {
		if (rdev->scratch.free[i]) {
			rdev->scratch.free[i] = false;
			*reg = rdev->scratch.reg[i];
			return 0;
		}
	}
	return -EINVAL;
}

/**
 * radeon_scratch_free - Free a scratch register
 *
 * @rdev: radeon_device pointer
 * @reg: scratch register mmio offset
 *
 * Free a CP scratch register allocated for use by the driver (all asics)
 */
void radeon_scratch_free(struct radeon_device *rdev, uint32_t reg)
{
	int i;

	for (i = 0; i < rdev->scratch.num_reg; i++) {
		if (rdev->scratch.reg[i] == reg) {
			rdev->scratch.free[i] = true;
			return;
		}
	}
}

/*
 * GPU doorbell aperture helpers function.
 */
/**
 * radeon_doorbell_init - Init doorbell driver information.
 *
 * @rdev: radeon_device pointer
 *
 * Init doorbell driver information (CIK)
 * Returns 0 on success, error on failure.
 */
static int radeon_doorbell_init(struct radeon_device *rdev)
{
	/* doorbell bar mapping */
	rdev->doorbell.base = pci_resource_start(rdev->pdev, 2);
	rdev->doorbell.size = pci_resource_len(rdev->pdev, 2);

	rdev->doorbell.num_doorbells = min_t(u32, rdev->doorbell.size / sizeof(u32), RADEON_MAX_DOORBELLS);
	if (rdev->doorbell.num_doorbells == 0)
		return -EINVAL;

	rdev->doorbell.ptr = ioremap(rdev->doorbell.base, rdev->doorbell.num_doorbells * sizeof(u32));
	if (rdev->doorbell.ptr == NULL) {
		return -ENOMEM;
	}
	DRM_INFO("doorbell mmio base: 0x%08X\n", (uint32_t)rdev->doorbell.base);
	DRM_INFO("doorbell mmio size: %u\n", (unsigned)rdev->doorbell.size);

	memset(&rdev->doorbell.used, 0, sizeof(rdev->doorbell.used));

	return 0;
}

/**
 * radeon_doorbell_fini - Tear down doorbell driver information.
 *
 * @rdev: radeon_device pointer
 *
 * Tear down doorbell driver information (CIK)
 */
static void radeon_doorbell_fini(struct radeon_device *rdev)
{
	iounmap(rdev->doorbell.ptr);
	rdev->doorbell.ptr = NULL;
}

/**
 * radeon_doorbell_get - Allocate a doorbell entry
 *
 * @rdev: radeon_device pointer
 * @doorbell: doorbell index
 *
 * Allocate a doorbell for use by the driver (all asics).
 * Returns 0 on success or -EINVAL on failure.
 */
int radeon_doorbell_get(struct radeon_device *rdev, u32 *doorbell)
{
	unsigned long offset = find_first_zero_bit(rdev->doorbell.used, rdev->doorbell.num_doorbells);
	if (offset < rdev->doorbell.num_doorbells) {
		__set_bit(offset, rdev->doorbell.used);
		*doorbell = offset;
		return 0;
	} else {
		return -EINVAL;
	}
}

/**
 * radeon_doorbell_free - Free a doorbell entry
 *
 * @rdev: radeon_device pointer
 * @doorbell: doorbell index
 *
 * Free a doorbell allocated for use by the driver (all asics)
 */
void radeon_doorbell_free(struct radeon_device *rdev, u32 doorbell)
{
	if (doorbell < rdev->doorbell.num_doorbells)
		__clear_bit(doorbell, rdev->doorbell.used);
}

/**
 * radeon_doorbell_get_kfd_info - Report doorbell configuration required to
 *                                setup KFD
 *
 * @rdev: radeon_device pointer
 * @aperture_base: output returning doorbell aperture base physical address
 * @aperture_size: output returning doorbell aperture size in bytes
 * @start_offset: output returning # of doorbell bytes reserved for radeon.
 *
 * Radeon and the KFD share the doorbell aperture. Radeon sets it up,
 * takes doorbells required for its own rings and reports the setup to KFD.
 * Radeon reserved doorbells are at the start of the doorbell aperture.
 */
void radeon_doorbell_get_kfd_info(struct radeon_device *rdev,
				  phys_addr_t *aperture_base,
				  size_t *aperture_size,
				  size_t *start_offset)
{
	/* The first num_doorbells are used by radeon.
	 * KFD takes whatever's left in the aperture. */
	if (rdev->doorbell.size > rdev->doorbell.num_doorbells * sizeof(u32)) {
		*aperture_base = rdev->doorbell.base;
		*aperture_size = rdev->doorbell.size;
		*start_offset = rdev->doorbell.num_doorbells * sizeof(u32);
	} else {
		*aperture_base = 0;
		*aperture_size = 0;
		*start_offset = 0;
	}
}

/*
 * radeon_wb_*()
 * Writeback is the the method by which the the GPU updates special pages
 * in memory with the status of certain GPU events (fences, ring pointers,
 * etc.).
 */

/**
 * radeon_wb_disable - Disable Writeback
 *
 * @rdev: radeon_device pointer
 *
 * Disables Writeback (all asics).  Used for suspend.
 */
void radeon_wb_disable(struct radeon_device *rdev)
{
	rdev->wb.enabled = false;
}

/**
 * radeon_wb_fini - Disable Writeback and free memory
 *
 * @rdev: radeon_device pointer
 *
 * Disables Writeback and frees the Writeback memory (all asics).
 * Used at driver shutdown.
 */
void radeon_wb_fini(struct radeon_device *rdev)
{
	radeon_wb_disable(rdev);
	if (rdev->wb.wb_obj) {
		if (!radeon_bo_reserve(rdev->wb.wb_obj, false)) {
			radeon_bo_kunmap(rdev->wb.wb_obj);
			radeon_bo_unpin(rdev->wb.wb_obj);
			radeon_bo_unreserve(rdev->wb.wb_obj);
		}
		radeon_bo_unref(&rdev->wb.wb_obj);
		rdev->wb.wb = NULL;
		rdev->wb.wb_obj = NULL;
	}
}

/**
 * radeon_wb_init- Init Writeback driver info and allocate memory
 *
 * @rdev: radeon_device pointer
 *
 * Disables Writeback and frees the Writeback memory (all asics).
 * Used at driver startup.
 * Returns 0 on success or an -error on failure.
 */
int radeon_wb_init(struct radeon_device *rdev)
{
	int r;

	if (rdev->wb.wb_obj == NULL) {
		r = radeon_bo_create(rdev, RADEON_GPU_PAGE_SIZE, PAGE_SIZE, true,
				     RADEON_GEM_DOMAIN_GTT, 0, NULL, NULL,
				     &rdev->wb.wb_obj);
		if (r) {
			dev_warn(rdev->dev, "(%d) create WB bo failed\n", r);
			return r;
		}
		r = radeon_bo_reserve(rdev->wb.wb_obj, false);
		if (unlikely(r != 0)) {
			radeon_wb_fini(rdev);
			return r;
		}
		r = radeon_bo_pin(rdev->wb.wb_obj, RADEON_GEM_DOMAIN_GTT,
				&rdev->wb.gpu_addr);
		if (r) {
			radeon_bo_unreserve(rdev->wb.wb_obj);
			dev_warn(rdev->dev, "(%d) pin WB bo failed\n", r);
			radeon_wb_fini(rdev);
			return r;
		}
		r = radeon_bo_kmap(rdev->wb.wb_obj, (void **)&rdev->wb.wb);
		radeon_bo_unreserve(rdev->wb.wb_obj);
		if (r) {
			dev_warn(rdev->dev, "(%d) map WB bo failed\n", r);
			radeon_wb_fini(rdev);
			return r;
		}
	}

	/* clear wb memory */
	memset((char *)rdev->wb.wb, 0, RADEON_GPU_PAGE_SIZE);
	/* disable event_write fences */
	rdev->wb.use_event = false;
	/* disabled via module param */
	if (radeon_no_wb == 1) {
		rdev->wb.enabled = false;
	} else {
		if (rdev->flags & RADEON_IS_AGP) {
			/* often unreliable on AGP */
			rdev->wb.enabled = false;
		} else if (rdev->family < CHIP_R300) {
			/* often unreliable on pre-r300 */
			rdev->wb.enabled = false;
		} else {
			rdev->wb.enabled = true;
			/* event_write fences are only available on r600+ */
			if (rdev->family >= CHIP_R600) {
				rdev->wb.use_event = true;
			}
		}
	}
	/* always use writeback/events on NI, APUs */
	if (rdev->family >= CHIP_PALM) {
		rdev->wb.enabled = true;
		rdev->wb.use_event = true;
	}

	dev_info(rdev->dev, "WB %sabled\n", rdev->wb.enabled ? "en" : "dis");

	return 0;
}

/**
 * radeon_vram_location - try to find VRAM location
 * @rdev: radeon device structure holding all necessary informations
 * @mc: memory controller structure holding memory informations
 * @base: base address at which to put VRAM
 *
 * Function will place try to place VRAM at base address provided
 * as parameter (which is so far either PCI aperture address or
 * for IGP TOM base address).
 *
 * If there is not enough space to fit the unvisible VRAM in the 32bits
 * address space then we limit the VRAM size to the aperture.
 *
 * If we are using AGP and if the AGP aperture doesn't allow us to have
 * room for all the VRAM than we restrict the VRAM to the PCI aperture
 * size and print a warning.
 *
 * This function will never fails, worst case are limiting VRAM.
 *
 * Note: GTT start, end, size should be initialized before calling this
 * function on AGP platform.
 *
 * Note: We don't explicitly enforce VRAM start to be aligned on VRAM size,
 * this shouldn't be a problem as we are using the PCI aperture as a reference.
 * Otherwise this would be needed for rv280, all r3xx, and all r4xx, but
 * not IGP.
 *
 * Note: we use mc_vram_size as on some board we need to program the mc to
 * cover the whole aperture even if VRAM size is inferior to aperture size
 * Novell bug 204882 + along with lots of ubuntu ones
 *
 * Note: when limiting vram it's safe to overwritte real_vram_size because
 * we are not in case where real_vram_size is inferior to mc_vram_size (ie
 * note afected by bogus hw of Novell bug 204882 + along with lots of ubuntu
 * ones)
 *
 * Note: IGP TOM addr should be the same as the aperture addr, we don't
 * explicitly check for that thought.
 *
 * FIXME: when reducing VRAM size align new size on power of 2.
 */
void radeon_vram_location(struct radeon_device *rdev, struct radeon_mc *mc, u64 base)
{
	uint64_t limit = (uint64_t)radeon_vram_limit << 20;

	mc->vram_start = base;
	if (mc->mc_vram_size > (rdev->mc.mc_mask - base + 1)) {
		dev_warn(rdev->dev, "limiting VRAM to PCI aperture size\n");
		mc->real_vram_size = mc->aper_size;
		mc->mc_vram_size = mc->aper_size;
	}
	mc->vram_end = mc->vram_start + mc->mc_vram_size - 1;
	if (rdev->flags & RADEON_IS_AGP && mc->vram_end > mc->gtt_start && mc->vram_start <= mc->gtt_end) {
		dev_warn(rdev->dev, "limiting VRAM to PCI aperture size\n");
		mc->real_vram_size = mc->aper_size;
		mc->mc_vram_size = mc->aper_size;
	}
	mc->vram_end = mc->vram_start + mc->mc_vram_size - 1;
	if (limit && limit < mc->real_vram_size)
		mc->real_vram_size = limit;
	dev_info(rdev->dev, "VRAM: %lluM 0x%016llX - 0x%016llX (%lluM used)\n",
			mc->mc_vram_size >> 20, mc->vram_start,
			mc->vram_end, mc->real_vram_size >> 20);
}

/**
 * radeon_gtt_location - try to find GTT location
 * @rdev: radeon device structure holding all necessary informations
 * @mc: memory controller structure holding memory informations
 *
 * Function will place try to place GTT before or after VRAM.
 *
 * If GTT size is bigger than space left then we ajust GTT size.
 * Thus function will never fails.
 *
 * FIXME: when reducing GTT size align new size on power of 2.
 */
void radeon_gtt_location(struct radeon_device *rdev, struct radeon_mc *mc)
{
	u64 size_af, size_bf;

	size_af = ((rdev->mc.mc_mask - mc->vram_end) + mc->gtt_base_align) & ~mc->gtt_base_align;
	size_bf = mc->vram_start & ~mc->gtt_base_align;
	if (size_bf > size_af) {
		if (mc->gtt_size > size_bf) {
			dev_warn(rdev->dev, "limiting GTT\n");
			mc->gtt_size = size_bf;
		}
		mc->gtt_start = (mc->vram_start & ~mc->gtt_base_align) - mc->gtt_size;
	} else {
		if (mc->gtt_size > size_af) {
			dev_warn(rdev->dev, "limiting GTT\n");
			mc->gtt_size = size_af;
		}
		mc->gtt_start = (mc->vram_end + 1 + mc->gtt_base_align) & ~mc->gtt_base_align;
	}
	mc->gtt_end = mc->gtt_start + mc->gtt_size - 1;
	dev_info(rdev->dev, "GTT: %lluM 0x%016llX - 0x%016llX\n",
			mc->gtt_size >> 20, mc->gtt_start, mc->gtt_end);
}

/*
 * GPU helpers function.
 */
/**
 * radeon_card_posted - check if the hw has already been initialized
 *
 * @rdev: radeon_device pointer
 *
 * Check if the asic has been initialized (all asics).
 * Used at driver startup.
 * Returns true if initialized or false if not.
 */
bool radeon_card_posted(struct radeon_device *rdev)
{
	uint32_t reg;

	if (ASIC_IS_NODCE(rdev))
		goto check_memsize;

	/* first check CRTCs */
	if (ASIC_IS_DCE4(rdev)) {
		reg = RREG32(EVERGREEN_CRTC_CONTROL + EVERGREEN_CRTC0_REGISTER_OFFSET) |
			RREG32(EVERGREEN_CRTC_CONTROL + EVERGREEN_CRTC1_REGISTER_OFFSET);
			if (rdev->num_crtc >= 4) {
				reg |= RREG32(EVERGREEN_CRTC_CONTROL + EVERGREEN_CRTC2_REGISTER_OFFSET) |
					RREG32(EVERGREEN_CRTC_CONTROL + EVERGREEN_CRTC3_REGISTER_OFFSET);
			}
			if (rdev->num_crtc >= 6) {
				reg |= RREG32(EVERGREEN_CRTC_CONTROL + EVERGREEN_CRTC4_REGISTER_OFFSET) |
					RREG32(EVERGREEN_CRTC_CONTROL + EVERGREEN_CRTC5_REGISTER_OFFSET);
			}
		if (reg & EVERGREEN_CRTC_MASTER_EN)
			return true;
	} else if (ASIC_IS_AVIVO(rdev)) {
		reg = RREG32(AVIVO_D1CRTC_CONTROL) |
		      RREG32(AVIVO_D2CRTC_CONTROL);
		if (reg & AVIVO_CRTC_EN) {
			return true;
		}
	} else {
		reg = RREG32(RADEON_CRTC_GEN_CNTL) |
		      RREG32(RADEON_CRTC2_GEN_CNTL);
		if (reg & RADEON_CRTC_EN) {
			return true;
		}
	}

check_memsize:
	/* then check MEM_SIZE, in case the crtcs are off */
	if (rdev->family >= CHIP_R600)
		reg = RREG32(R600_CONFIG_MEMSIZE);
	else
		reg = RREG32(RADEON_CONFIG_MEMSIZE);

	if (reg)
		return true;

	return false;

}

/**
 * radeon_update_bandwidth_info - update display bandwidth params
 *
 * @rdev: radeon_device pointer
 *
 * Used when sclk/mclk are switched or display modes are set.
 * params are used to calculate display watermarks (all asics)
 */
void radeon_update_bandwidth_info(struct radeon_device *rdev)
{
	fixed20_12 a;
	u32 sclk = rdev->pm.current_sclk;
	u32 mclk = rdev->pm.current_mclk;

	/* sclk/mclk in Mhz */
	a.full = dfixed_const(100);
	rdev->pm.sclk.full = dfixed_const(sclk);
	rdev->pm.sclk.full = dfixed_div(rdev->pm.sclk, a);
	rdev->pm.mclk.full = dfixed_const(mclk);
	rdev->pm.mclk.full = dfixed_div(rdev->pm.mclk, a);

	if (rdev->flags & RADEON_IS_IGP) {
		a.full = dfixed_const(16);
		/* core_bandwidth = sclk(Mhz) * 16 */
		rdev->pm.core_bandwidth.full = dfixed_div(rdev->pm.sclk, a);
	}
}

/**
 * radeon_boot_test_post_card - check and possibly initialize the hw
 *
 * @rdev: radeon_device pointer
 *
 * Check if the asic is initialized and if not, attempt to initialize
 * it (all asics).
 * Returns true if initialized or false if not.
 */
bool radeon_boot_test_post_card(struct radeon_device *rdev)
{
	if (radeon_card_posted(rdev))
		return true;

	if (rdev->bios) {
		DRM_INFO("GPU not posted. posting now...\n");
		if (rdev->is_atom_bios)
			atom_asic_init(rdev->mode_info.atom_context);
		else
			radeon_combios_asic_init(rdev->ddev);
		return true;
	} else {
		dev_err(rdev->dev, "Card not posted and no BIOS - ignoring\n");
		return false;
	}
}

/**
 * radeon_dummy_page_init - init dummy page used by the driver
 *
 * @rdev: radeon_device pointer
 *
 * Allocate the dummy page used by the driver (all asics).
 * This dummy page is used by the driver as a filler for gart entries
 * when pages are taken out of the GART
 * Returns 0 on sucess, -ENOMEM on failure.
 */
int radeon_dummy_page_init(struct radeon_device *rdev)
{
	if (rdev->dummy_page.page)
		return 0;
	rdev->dummy_page.page = alloc_page(GFP_DMA32 | GFP_KERNEL | __GFP_ZERO);
	if (rdev->dummy_page.page == NULL)
		return -ENOMEM;
	rdev->dummy_page.addr = pci_map_page(rdev->pdev, rdev->dummy_page.page,
					0, PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
	rdev->dummy_page.entry = radeon_gart_get_page_entry(rdev->dummy_page.addr,
							    RADEON_GART_PAGE_DUMMY);
	return 0;
}

/**
 * radeon_dummy_page_fini - free dummy page used by the driver
 *
 * @rdev: radeon_device pointer
 *
 * Frees the dummy page used by the driver (all asics).
 */
void radeon_dummy_page_fini(struct radeon_device *rdev)
{
	if (rdev->dummy_page.page == NULL)
		return;

	rdev->dummy_page.page = NULL;
}


/* ATOM accessor methods */
/*
 * ATOM is an interpreted byte code stored in tables in the vbios.  The
 * driver registers callbacks to access registers and the interpreter
 * in the driver parses the tables and executes then to program specific
 * actions (set display modes, asic init, etc.).  See radeon_atombios.c,
 * atombios.h, and atom.c
 */

/**
 * cail_pll_read - read PLL register
 *
 * @info: atom card_info pointer
 * @reg: PLL register offset
 *
 * Provides a PLL register accessor for the atom interpreter (r4xx+).
 * Returns the value of the PLL register.
 */
static uint32_t cail_pll_read(struct card_info *info, uint32_t reg)
{
	struct radeon_device *rdev = info->dev->dev_private;
	uint32_t r;

	r = rdev->pll_rreg(rdev, reg);
	return r;
}

/**
 * cail_pll_write - write PLL register
 *
 * @info: atom card_info pointer
 * @reg: PLL register offset
 * @val: value to write to the pll register
 *
 * Provides a PLL register accessor for the atom interpreter (r4xx+).
 */
static void cail_pll_write(struct card_info *info, uint32_t reg, uint32_t val)
{
	struct radeon_device *rdev = info->dev->dev_private;

	rdev->pll_wreg(rdev, reg, val);
}

/**
 * cail_mc_read - read MC (Memory Controller) register
 *
 * @info: atom card_info pointer
 * @reg: MC register offset
 *
 * Provides an MC register accessor for the atom interpreter (r4xx+).
 * Returns the value of the MC register.
 */
static uint32_t cail_mc_read(struct card_info *info, uint32_t reg)
{
	struct radeon_device *rdev = info->dev->dev_private;
	uint32_t r;

	r = rdev->mc_rreg(rdev, reg);
	return r;
}

/**
 * cail_mc_write - write MC (Memory Controller) register
 *
 * @info: atom card_info pointer
 * @reg: MC register offset
 * @val: value to write to the pll register
 *
 * Provides a MC register accessor for the atom interpreter (r4xx+).
 */
static void cail_mc_write(struct card_info *info, uint32_t reg, uint32_t val)
{
	struct radeon_device *rdev = info->dev->dev_private;

	rdev->mc_wreg(rdev, reg, val);
}

/**
 * cail_reg_write - write MMIO register
 *
 * @info: atom card_info pointer
 * @reg: MMIO register offset
 * @val: value to write to the pll register
 *
 * Provides a MMIO register accessor for the atom interpreter (r4xx+).
 */
static void cail_reg_write(struct card_info *info, uint32_t reg, uint32_t val)
{
	struct radeon_device *rdev = info->dev->dev_private;

	WREG32(reg*4, val);
}

/**
 * cail_reg_read - read MMIO register
 *
 * @info: atom card_info pointer
 * @reg: MMIO register offset
 *
 * Provides an MMIO register accessor for the atom interpreter (r4xx+).
 * Returns the value of the MMIO register.
 */
static uint32_t cail_reg_read(struct card_info *info, uint32_t reg)
{
	struct radeon_device *rdev = info->dev->dev_private;
	uint32_t r;

	r = RREG32(reg*4);
	return r;
}

/**
 * cail_ioreg_write - write IO register
 *
 * @info: atom card_info pointer
 * @reg: IO register offset
 * @val: value to write to the pll register
 *
 * Provides a IO register accessor for the atom interpreter (r4xx+).
 */
static void cail_ioreg_write(struct card_info *info, uint32_t reg, uint32_t val)
{
	struct radeon_device *rdev = info->dev->dev_private;

	WREG32_IO(reg*4, val);
}

/**
 * cail_ioreg_read - read IO register
 *
 * @info: atom card_info pointer
 * @reg: IO register offset
 *
 * Provides an IO register accessor for the atom interpreter (r4xx+).
 * Returns the value of the IO register.
 */
static uint32_t cail_ioreg_read(struct card_info *info, uint32_t reg)
{
	struct radeon_device *rdev = info->dev->dev_private;
	uint32_t r;

	r = RREG32_IO(reg*4);
	return r;
}

/**
 * radeon_atombios_init - init the driver info and callbacks for atombios
 *
 * @rdev: radeon_device pointer
 *
 * Initializes the driver info and register access callbacks for the
 * ATOM interpreter (r4xx+).
 * Returns 0 on sucess, -ENOMEM on failure.
 * Called at driver startup.
 */
int radeon_atombios_init(struct radeon_device *rdev)
{
	struct card_info *atom_card_info =
	    kzalloc(sizeof(struct card_info), GFP_KERNEL);

	if (!atom_card_info)
		return -ENOMEM;

	rdev->mode_info.atom_card_info = atom_card_info;
	atom_card_info->dev = rdev->ddev;
	atom_card_info->reg_read = cail_reg_read;
	atom_card_info->reg_write = cail_reg_write;
	/* needed for iio ops */
	if (rdev->rio_mem) {
		atom_card_info->ioreg_read = cail_ioreg_read;
		atom_card_info->ioreg_write = cail_ioreg_write;
	} else {
		DRM_ERROR("Unable to find PCI I/O BAR; using MMIO for ATOM IIO\n");
		atom_card_info->ioreg_read = cail_reg_read;
		atom_card_info->ioreg_write = cail_reg_write;
	}
	atom_card_info->mc_read = cail_mc_read;
	atom_card_info->mc_write = cail_mc_write;
	atom_card_info->pll_read = cail_pll_read;
	atom_card_info->pll_write = cail_pll_write;

	rdev->mode_info.atom_context = atom_parse(atom_card_info, rdev->bios);
	if (!rdev->mode_info.atom_context) {
		radeon_atombios_fini(rdev);
		return -ENOMEM;
	}

	mutex_init(&rdev->mode_info.atom_context->mutex);
	mutex_init(&rdev->mode_info.atom_context->scratch_mutex);
	radeon_atom_initialize_bios_scratch_regs(rdev->ddev);
	atom_allocate_fb_scratch(rdev->mode_info.atom_context);
	return 0;
}

/**
 * radeon_atombios_fini - free the driver info and callbacks for atombios
 *
 * @rdev: radeon_device pointer
 *
 * Frees the driver info and register access callbacks for the ATOM
 * interpreter (r4xx+).
 * Called at driver shutdown.
 */
void radeon_atombios_fini(struct radeon_device *rdev)
{
	if (rdev->mode_info.atom_context) {
		kfree(rdev->mode_info.atom_context->scratch);
	}
	kfree(rdev->mode_info.atom_context);
	rdev->mode_info.atom_context = NULL;
	kfree(rdev->mode_info.atom_card_info);
	rdev->mode_info.atom_card_info = NULL;
}

/* COMBIOS */
/*
 * COMBIOS is the bios format prior to ATOM. It provides
 * command tables similar to ATOM, but doesn't have a unified
 * parser.  See radeon_combios.c
 */

/**
 * radeon_combios_init - init the driver info for combios
 *
 * @rdev: radeon_device pointer
 *
 * Initializes the driver info for combios (r1xx-r3xx).
 * Returns 0 on sucess.
 * Called at driver startup.
 */
int radeon_combios_init(struct radeon_device *rdev)
{
	radeon_combios_initialize_bios_scratch_regs(rdev->ddev);
	return 0;
}

/**
 * radeon_combios_fini - free the driver info for combios
 *
 * @rdev: radeon_device pointer
 *
 * Frees the driver info for combios (r1xx-r3xx).
 * Called at driver shutdown.
 */
void radeon_combios_fini(struct radeon_device *rdev)
{
}

/* if we get transitioned to only one device, take VGA back */
/**
 * radeon_vga_set_decode - enable/disable vga decode
 *
 * @cookie: radeon_device pointer
 * @state: enable/disable vga decode
 *
 * Enable/disable vga decode (all asics).
 * Returns VGA resource flags.
 */
static unsigned int radeon_vga_set_decode(void *cookie, bool state)
{
	struct radeon_device *rdev = cookie;
	radeon_vga_set_state(rdev, state);
	if (state)
		return VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM |
		       VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
	else
		return VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
}

/**
 * radeon_check_pot_argument - check that argument is a power of two
 *
 * @arg: value to check
 *
 * Validates that a certain argument is a power of two (all asics).
 * Returns true if argument is valid.
 */
static bool radeon_check_pot_argument(int arg)
{
	return (arg & (arg - 1)) == 0;
}

/**
 * Determine a sensible default GART size according to ASIC family.
 *
 * @family ASIC family name
 */
static int radeon_gart_size_auto(enum radeon_family family)
{
	/* default to a larger gart size on newer asics */
	if (family >= CHIP_TAHITI)
		return 2048;
	else if (family >= CHIP_RV770)
		return 1024;
	else
		return 512;
}

/**
 * radeon_check_arguments - validate module params
 *
 * @rdev: radeon_device pointer
 *
 * Validates certain module parameters and updates
 * the associated values used by the driver (all asics).
 */
static void radeon_check_arguments(struct radeon_device *rdev)
{
	/* vramlimit must be a power of two */
	if (!radeon_check_pot_argument(radeon_vram_limit)) {
		dev_warn(rdev->dev, "vram limit (%d) must be a power of 2\n",
				radeon_vram_limit);
		radeon_vram_limit = 0;
	}

	if (radeon_gart_size == -1) {
		radeon_gart_size = radeon_gart_size_auto(rdev->family);
	}
	/* gtt size must be power of two and greater or equal to 32M */
	if (radeon_gart_size < 32) {
		dev_warn(rdev->dev, "gart size (%d) too small\n",
				radeon_gart_size);
		radeon_gart_size = radeon_gart_size_auto(rdev->family);
	} else if (!radeon_check_pot_argument(radeon_gart_size)) {
		dev_warn(rdev->dev, "gart size (%d) must be a power of 2\n",
				radeon_gart_size);
		radeon_gart_size = radeon_gart_size_auto(rdev->family);
	}
	rdev->mc.gtt_size = (uint64_t)radeon_gart_size << 20;

	/* AGP mode can only be -1, 1, 2, 4, 8 */
	switch (radeon_agpmode) {
	case -1:
	case 0:
	case 1:
	case 2:
	case 4:
	case 8:
		break;
	default:
		dev_warn(rdev->dev, "invalid AGP mode %d (valid mode: "
				"-1, 0, 1, 2, 4, 8)\n", radeon_agpmode);
		radeon_agpmode = 0;
		break;
	}

	if (!radeon_check_pot_argument(radeon_vm_size)) {
		dev_warn(rdev->dev, "VM size (%d) must be a power of 2\n",
			 radeon_vm_size);
		radeon_vm_size = 4;
	}

	if (radeon_vm_size < 1) {
		dev_warn(rdev->dev, "VM size (%d) too small, min is 1GB\n",
			 radeon_vm_size);
		radeon_vm_size = 4;
	}

	/*
	 * Max GPUVM size for Cayman, SI and CI are 40 bits.
	 */
	if (radeon_vm_size > 1024) {
		dev_warn(rdev->dev, "VM size (%d) too large, max is 1TB\n",
			 radeon_vm_size);
		radeon_vm_size = 4;
	}

	/* defines number of bits in page table versus page directory,
	 * a page is 4KB so we have 12 bits offset, minimum 9 bits in the
	 * page table and the remaining bits are in the page directory */
	if (radeon_vm_block_size == -1) {

		/* Total bits covered by PD + PTs */
		unsigned bits = ilog2(radeon_vm_size) + 18;

		/* Make sure the PD is 4K in size up to 8GB address space.
		   Above that split equal between PD and PTs */
		if (radeon_vm_size <= 8)
			radeon_vm_block_size = bits - 9;
		else
			radeon_vm_block_size = (bits + 3) / 2;

	} else if (radeon_vm_block_size < 9) {
		dev_warn(rdev->dev, "VM page table size (%d) too small\n",
			 radeon_vm_block_size);
		radeon_vm_block_size = 9;
	}

	if (radeon_vm_block_size > 24 ||
	    (radeon_vm_size * 1024) < (1ull << radeon_vm_block_size)) {
		dev_warn(rdev->dev, "VM page table size (%d) too large\n",
			 radeon_vm_block_size);
		radeon_vm_block_size = 9;
	}
}

/**
 * radeon_device_init - initialize the driver
 *
 * @rdev: radeon_device pointer
 * @pdev: drm dev pointer
 * @pdev: pci dev pointer
 * @flags: driver flags
 *
 * Initializes the driver info and hw (all asics).
 * Returns 0 for success or an error on failure.
 * Called at driver startup.
 */
int radeon_device_init(struct radeon_device *rdev,
		       struct drm_device *ddev,
		       struct pci_dev *pdev,
		       uint32_t flags)
{
	int r, i;
	int dma_bits;
	bool runtime = false;

	rdev->shutdown = false;
	rdev->dev = &pdev->dev;
	rdev->ddev = ddev;
	rdev->pdev = pdev;
	rdev->flags = flags;
	rdev->family = flags & RADEON_FAMILY_MASK;
	rdev->is_atom_bios = false;
	rdev->usec_timeout = RADEON_MAX_USEC_TIMEOUT;
	rdev->mc.gtt_size = 512 * 1024 * 1024;
	rdev->accel_working = false;
	/* set up ring ids */
	for (i = 0; i < RADEON_NUM_RINGS; i++) {
		rdev->ring[i].idx = i;
	}
	rdev->fence_context = fence_context_alloc(RADEON_NUM_RINGS);

	DRM_INFO("initializing kernel modesetting (%s 0x%04X:0x%04X 0x%04X:0x%04X 0x%02X).\n",
		 radeon_family_name[rdev->family], pdev->vendor, pdev->device,
		 pdev->subsystem_vendor, pdev->subsystem_device, pdev->revision);

	/* mutex initialization are all done here so we
	 * can recall function without having locking issues */
	mutex_init(&rdev->ring_lock);
	mutex_init(&rdev->dc_hw_i2c_mutex);
	atomic_set(&rdev->ih.lock, 0);
	mutex_init(&rdev->gem.mutex);
	mutex_init(&rdev->pm.mutex);
	mutex_init(&rdev->gpu_clock_mutex);
	mutex_init(&rdev->srbm_mutex);
	mutex_init(&rdev->grbm_idx_mutex);
	init_rwsem(&rdev->pm.mclk_lock);
	init_rwsem(&rdev->exclusive_lock);
	init_waitqueue_head(&rdev->irq.vblank_queue);
	mutex_init(&rdev->mn_lock);
//	hash_init(rdev->mn_hash);
	r = radeon_gem_init(rdev);
	if (r)
		return r;

	radeon_check_arguments(rdev);
	/* Adjust VM size here.
	 * Max GPUVM size for cayman+ is 40 bits.
	 */
	rdev->vm_manager.max_pfn = radeon_vm_size << 18;

	/* Set asic functions */
	r = radeon_asic_init(rdev);
	if (r)
		return r;

	/* all of the newer IGP chips have an internal gart
	 * However some rs4xx report as AGP, so remove that here.
	 */
	if ((rdev->family >= CHIP_RS400) &&
	    (rdev->flags & RADEON_IS_IGP)) {
		rdev->flags &= ~RADEON_IS_AGP;
	}

	if (rdev->flags & RADEON_IS_AGP && radeon_agpmode == -1) {
		radeon_agp_disable(rdev);
	}

	/* Set the internal MC address mask
	 * This is the max address of the GPU's
	 * internal address space.
	 */
	if (rdev->family >= CHIP_CAYMAN)
		rdev->mc.mc_mask = 0xffffffffffULL; /* 40 bit MC */
	else if (rdev->family >= CHIP_CEDAR)
		rdev->mc.mc_mask = 0xfffffffffULL; /* 36 bit MC */
	else
		rdev->mc.mc_mask = 0xffffffffULL; /* 32 bit MC */

	/* set DMA mask + need_dma32 flags.
	 * PCIE - can handle 40-bits.
	 * IGP - can handle 40-bits
	 * AGP - generally dma32 is safest
	 * PCI - dma32 for legacy pci gart, 40 bits on newer asics
	 */
	rdev->need_dma32 = false;
	if (rdev->flags & RADEON_IS_AGP)
		rdev->need_dma32 = true;
	if ((rdev->flags & RADEON_IS_PCI) &&
	    (rdev->family <= CHIP_RS740))
		rdev->need_dma32 = true;


	/* Registers mapping */
	/* TODO: block userspace mapping of io register */
	spin_lock_init(&rdev->mmio_idx_lock);
	spin_lock_init(&rdev->smc_idx_lock);
	spin_lock_init(&rdev->pll_idx_lock);
	spin_lock_init(&rdev->mc_idx_lock);
	spin_lock_init(&rdev->pcie_idx_lock);
	spin_lock_init(&rdev->pciep_idx_lock);
	spin_lock_init(&rdev->pif_idx_lock);
	spin_lock_init(&rdev->cg_idx_lock);
	spin_lock_init(&rdev->uvd_idx_lock);
	spin_lock_init(&rdev->rcu_idx_lock);
	spin_lock_init(&rdev->didt_idx_lock);
	spin_lock_init(&rdev->end_idx_lock);
	if (rdev->family >= CHIP_BONAIRE) {
		rdev->rmmio_base = pci_resource_start(rdev->pdev, 5);
		rdev->rmmio_size = pci_resource_len(rdev->pdev, 5);
	} else {
		rdev->rmmio_base = pci_resource_start(rdev->pdev, 2);
		rdev->rmmio_size = pci_resource_len(rdev->pdev, 2);
	}
	rdev->rmmio = ioremap(rdev->rmmio_base, rdev->rmmio_size);
	if (rdev->rmmio == NULL) {
		return -ENOMEM;
	}
	DRM_INFO("register mmio base: 0x%08X\n", (uint32_t)rdev->rmmio_base);
	DRM_INFO("register mmio size: %u\n", (unsigned)rdev->rmmio_size);

	/* doorbell bar mapping */
	if (rdev->family >= CHIP_BONAIRE)
		radeon_doorbell_init(rdev);

	/* io port mapping */
	for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
		if (pci_resource_flags(rdev->pdev, i) & IORESOURCE_IO) {
			rdev->rio_mem_size = pci_resource_len(rdev->pdev, i);
			rdev->rio_mem = pci_iomap(rdev->pdev, i, rdev->rio_mem_size);
			break;
		}
	}
	if (rdev->rio_mem == NULL)
		DRM_ERROR("Unable to find PCI I/O BAR\n");

	if (rdev->flags & RADEON_IS_PX)
		radeon_device_handle_px_quirks(rdev);
	if (rdev->flags & RADEON_IS_PX)
		runtime = true;

	r = radeon_init(rdev);
	if (r)
		goto failed;



	if (rdev->flags & RADEON_IS_AGP && !rdev->accel_working) {
		/* Acceleration not working on AGP card try again
		 * with fallback to PCI or PCIE GART
		 */
		radeon_asic_reset(rdev);
		radeon_fini(rdev);
		radeon_agp_disable(rdev);
		r = radeon_init(rdev);
		if (r)
			goto failed;
	}

//   r = radeon_ib_ring_tests(rdev);
//   if (r)
//       DRM_ERROR("ib ring test failed (%d).\n", r);

	if ((radeon_testing & 1)) {
		if (rdev->accel_working)
			radeon_test_moves(rdev);
		else
			DRM_INFO("radeon: acceleration disabled, skipping move tests\n");
	}
	if ((radeon_testing & 2)) {
		if (rdev->accel_working)
			radeon_test_syncing(rdev);
		else
			DRM_INFO("radeon: acceleration disabled, skipping sync tests\n");
	}
	if (radeon_benchmarking) {
		if (rdev->accel_working)
			radeon_benchmark(rdev, radeon_benchmarking);
		else
			DRM_INFO("radeon: acceleration disabled, skipping benchmarks\n");
	}
	return 0;

failed:
	return r;
}

/**
 * radeon_gpu_reset - reset the asic
 *
 * @rdev: radeon device pointer
 *
 * Attempt the reset the GPU if it has hung (all asics).
 * Returns 0 for success or an error on failure.
 */
int radeon_gpu_reset(struct radeon_device *rdev)
{
    unsigned ring_sizes[RADEON_NUM_RINGS];
    uint32_t *ring_data[RADEON_NUM_RINGS];

    bool saved = false;

    int i, r;
    int resched;

	down_write(&rdev->exclusive_lock);

	if (!rdev->needs_reset) {
		up_write(&rdev->exclusive_lock);
		return 0;
	}

	atomic_inc(&rdev->gpu_reset_counter);

    radeon_save_bios_scratch_regs(rdev);
    /* block TTM */
//    resched = ttm_bo_lock_delayed_workqueue(&rdev->mman.bdev);
    radeon_suspend(rdev);

    for (i = 0; i < RADEON_NUM_RINGS; ++i) {
        ring_sizes[i] = radeon_ring_backup(rdev, &rdev->ring[i],
                           &ring_data[i]);
        if (ring_sizes[i]) {
            saved = true;
            dev_info(rdev->dev, "Saved %d dwords of commands "
                 "on ring %d.\n", ring_sizes[i], i);
        }
    }

    r = radeon_asic_reset(rdev);
    if (!r) {
        dev_info(rdev->dev, "GPU reset succeeded, trying to resume\n");
        radeon_resume(rdev);
    }

    radeon_restore_bios_scratch_regs(rdev);

        for (i = 0; i < RADEON_NUM_RINGS; ++i) {
		if (!r && ring_data[i]) {
            radeon_ring_restore(rdev, &rdev->ring[i],
                        ring_sizes[i], ring_data[i]);
    } else {
			radeon_fence_driver_force_completion(rdev, i);
            kfree(ring_data[i]);
        }
    }

//    ttm_bo_unlock_delayed_workqueue(&rdev->mman.bdev, resched);
    if (r) {
        /* bad news, how to tell it to userspace ? */
        dev_info(rdev->dev, "GPU reset failed\n");
    }

	rdev->needs_reset = r == -EAGAIN;
	rdev->in_reset = false;

	up_read(&rdev->exclusive_lock);
    return r;
}


/*
 * Driver load/unload
 */
int radeon_driver_load_kms(struct drm_device *dev, unsigned long flags)
{
    struct radeon_device *rdev;
    int r;


    rdev = kzalloc(sizeof(struct radeon_device), GFP_KERNEL);
    if (rdev == NULL) {
        return -ENOMEM;
    };

    dev->dev_private = (void *)rdev;

    /* update BUS flag */
    if (drm_pci_device_is_agp(dev)) {
        flags |= RADEON_IS_AGP;
    } else if (drm_device_is_pcie(dev)) {
        flags |= RADEON_IS_PCIE;
    } else {
        flags |= RADEON_IS_PCI;
    }

    /* radeon_device_init should report only fatal error
     * like memory allocation failure or iomapping failure,
     * or memory manager initialization failure, it must
     * properly initialize the GPU MC controller and permit
     * VRAM allocation
     */
    r = radeon_device_init(rdev, dev, dev->pdev, flags);
    if (r) {
        DRM_ERROR("Fatal error while trying to initialize radeon.\n");
        return r;
    }
    /* Again modeset_init should fail only on fatal error
     * otherwise it should provide enough functionalities
     * for shadowfb to run
     */
    main_device = dev;

    if( radeon_modeset )
    {
        r = radeon_modeset_init(rdev);
        if (r) {
            return r;
        }
        init_display_kms(dev, &usermode);
    }
    else
        init_display(rdev, &usermode);

    return 0;
}



resource_size_t drm_get_resource_start(struct drm_device *dev, unsigned int resource)
{
    return pci_resource_start(dev->pdev, resource);
}

resource_size_t drm_get_resource_len(struct drm_device *dev, unsigned int resource)
{
    return pci_resource_len(dev->pdev, resource);
}


uint32_t __div64_32(uint64_t *n, uint32_t base)
{
        uint64_t rem = *n;
        uint64_t b = base;
        uint64_t res, d = 1;
        uint32_t high = rem >> 32;

        /* Reduce the thing a bit first */
        res = 0;
        if (high >= base) {
                high /= base;
                res = (uint64_t) high << 32;
                rem -= (uint64_t) (high*base) << 32;
        }

        while ((int64_t)b > 0 && b < rem) {
                b = b+b;
                d = d+d;
        }

        do {
                if (rem >= b) {
                        rem -= b;
                        res += d;
                }
                b >>= 1;
                d >>= 1;
        } while (d);

        *n = res;
        return rem;
}

static struct pci_device_id pciidlist[] = {
    radeon_PCI_IDS
};

u32 radeon_get_vblank_counter_kms(struct drm_device *dev, unsigned int pipe);
int radeon_enable_vblank_kms(struct drm_device *dev, unsigned int pipe);
void radeon_disable_vblank_kms(struct drm_device *dev, unsigned int pipe);
int radeon_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe,
				    int *max_error,
				    struct timeval *vblank_time,
				    unsigned flags); 
void radeon_gem_object_free(struct drm_gem_object *obj); 
void radeon_driver_irq_preinstall_kms(struct drm_device *dev);
int radeon_driver_irq_postinstall_kms(struct drm_device *dev);
void radeon_driver_irq_uninstall_kms(struct drm_device *dev);
irqreturn_t radeon_driver_irq_handler_kms(int irq, void *arg);


static struct drm_driver kms_driver = {
    .driver_features =
        DRIVER_USE_AGP |
        DRIVER_HAVE_IRQ | DRIVER_IRQ_SHARED | DRIVER_GEM |
        DRIVER_PRIME | DRIVER_RENDER,
    .load = radeon_driver_load_kms,
//    .open = radeon_driver_open_kms,
//    .preclose = radeon_driver_preclose_kms,
//    .postclose = radeon_driver_postclose_kms,
//    .lastclose = radeon_driver_lastclose_kms,
//    .unload = radeon_driver_unload_kms,
    .get_vblank_counter = radeon_get_vblank_counter_kms,
    .enable_vblank = radeon_enable_vblank_kms,
    .disable_vblank = radeon_disable_vblank_kms,
    .get_vblank_timestamp = radeon_get_vblank_timestamp_kms,
    .get_scanout_position = radeon_get_crtc_scanoutpos,
#if defined(CONFIG_DEBUG_FS)
    .debugfs_init = radeon_debugfs_init,
    .debugfs_cleanup = radeon_debugfs_cleanup,
#endif
    .irq_preinstall = radeon_driver_irq_preinstall_kms,
    .irq_postinstall = radeon_driver_irq_postinstall_kms,
    .irq_uninstall = radeon_driver_irq_uninstall_kms,
    .irq_handler = radeon_driver_irq_handler_kms,
//    .ioctls = radeon_ioctls_kms,
    .gem_free_object = radeon_gem_object_free,
//    .gem_open_object = radeon_gem_object_open,
//    .gem_close_object = radeon_gem_object_close,
//    .dumb_create = radeon_mode_dumb_create,
//    .dumb_map_offset = radeon_mode_dumb_mmap,
//    .dumb_destroy = drm_gem_dumb_destroy,
//    .fops = &radeon_driver_kms_fops,

//    .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
//    .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
//    .gem_prime_export = drm_gem_prime_export,
//    .gem_prime_import = drm_gem_prime_import,
//    .gem_prime_pin = radeon_gem_prime_pin,
//    .gem_prime_unpin = radeon_gem_prime_unpin,
//    .gem_prime_get_sg_table = radeon_gem_prime_get_sg_table,
//    .gem_prime_import_sg_table = radeon_gem_prime_import_sg_table,
//    .gem_prime_vmap = radeon_gem_prime_vmap,
//    .gem_prime_vunmap = radeon_gem_prime_vunmap,

};

int ati_init(void)
{
    static pci_dev_t device;
    const struct pci_device_id  *ent;
    int  err;

    ent = find_pci_device(&device, pciidlist);
    if( unlikely(ent == NULL) )
    {
        dbgprintf("device not found\n");
        return -ENODEV;
    };

    drm_core_init();

    DRM_INFO("device %x:%x\n", device.pci_dev.vendor,
                                device.pci_dev.device);

    kms_driver.driver_features |= DRIVER_MODESET;

    err = drm_get_pci_dev(&device.pci_dev, ent, &kms_driver);

    return err;
}