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/*

 * Copyright © 2013 Intel Corporation

 *

 * 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 (including the next

 * paragraph) 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 AUTHORS OR COPYRIGHT HOLDERS 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.

 */

#include "i915_drv.h"

#include "intel_drv.h"

#define FORCEWAKE_ACK_TIMEOUT_MS 2

#define __raw_i915_read8(dev_priv__, reg__) readb((dev_priv__)->regs + (reg__))

#define __raw_i915_write8(dev_priv__, reg__, val__) writeb(val__, (dev_priv__)->regs + (reg__))

#define __raw_i915_read16(dev_priv__, reg__) readw((dev_priv__)->regs + (reg__))

#define __raw_i915_write16(dev_priv__, reg__, val__) writew(val__, (dev_priv__)->regs + (reg__))

#define __raw_i915_read32(dev_priv__, reg__) readl((dev_priv__)->regs + (reg__))

#define __raw_i915_write32(dev_priv__, reg__, val__) writel(val__, (dev_priv__)->regs + (reg__))

#define __raw_i915_read64(dev_priv__, reg__) readq((dev_priv__)->regs + (reg__))

#define __raw_i915_write64(dev_priv__, reg__, val__) writeq(val__, (dev_priv__)->regs + (reg__))

#define __raw_posting_read(dev_priv__, reg__) (void)__raw_i915_read32(dev_priv__, reg__)

static void __gen6_gt_wait_for_thread_c0(struct drm_i915_private *dev_priv)

{

	u32 gt_thread_status_mask;

	if (IS_HASWELL(dev_priv->dev))

		gt_thread_status_mask = GEN6_GT_THREAD_STATUS_CORE_MASK_HSW;

	else

		gt_thread_status_mask = GEN6_GT_THREAD_STATUS_CORE_MASK;

	/* w/a for a sporadic read returning 0 by waiting for the GT

	 * thread to wake up.

	 */

	if (wait_for_atomic_us((__raw_i915_read32(dev_priv, GEN6_GT_THREAD_STATUS_REG) & gt_thread_status_mask) == 0, 500))

		DRM_ERROR("GT thread status wait timed out\n");

}

static void __gen6_gt_force_wake_reset(struct drm_i915_private *dev_priv)

{

	__raw_i915_write32(dev_priv, FORCEWAKE, 0);

	/* something from same cacheline, but !FORCEWAKE */

	__raw_posting_read(dev_priv, ECOBUS);

}

static void __gen6_gt_force_wake_get(struct drm_i915_private *dev_priv)

{

	if (wait_for_atomic((__raw_i915_read32(dev_priv, FORCEWAKE_ACK) & 1) == 0,

			    FORCEWAKE_ACK_TIMEOUT_MS))

		DRM_ERROR("Timed out waiting for forcewake old ack to clear.\n");

	__raw_i915_write32(dev_priv, FORCEWAKE, 1);

	/* something from same cacheline, but !FORCEWAKE */

	__raw_posting_read(dev_priv, ECOBUS);

	if (wait_for_atomic((__raw_i915_read32(dev_priv, FORCEWAKE_ACK) & 1),

			    FORCEWAKE_ACK_TIMEOUT_MS))

		DRM_ERROR("Timed out waiting for forcewake to ack request.\n");

	/* WaRsForcewakeWaitTC0:snb */

	__gen6_gt_wait_for_thread_c0(dev_priv);

}

static void __gen6_gt_force_wake_mt_reset(struct drm_i915_private *dev_priv)

{

	__raw_i915_write32(dev_priv, FORCEWAKE_MT, _MASKED_BIT_DISABLE(0xffff));

	/* something from same cacheline, but !FORCEWAKE_MT */

	__raw_posting_read(dev_priv, ECOBUS);

}

static void __gen6_gt_force_wake_mt_get(struct drm_i915_private *dev_priv)

{

	u32 forcewake_ack;

	if (IS_HASWELL(dev_priv->dev))

		forcewake_ack = FORCEWAKE_ACK_HSW;

	else

		forcewake_ack = FORCEWAKE_MT_ACK;

	if (wait_for_atomic((__raw_i915_read32(dev_priv, forcewake_ack) & FORCEWAKE_KERNEL) == 0,

			    FORCEWAKE_ACK_TIMEOUT_MS))

		DRM_ERROR("Timed out waiting for forcewake old ack to clear.\n");

	__raw_i915_write32(dev_priv, FORCEWAKE_MT,

			   _MASKED_BIT_ENABLE(FORCEWAKE_KERNEL));

	/* something from same cacheline, but !FORCEWAKE_MT */

	__raw_posting_read(dev_priv, ECOBUS);

	if (wait_for_atomic((__raw_i915_read32(dev_priv, forcewake_ack) & FORCEWAKE_KERNEL),

			    FORCEWAKE_ACK_TIMEOUT_MS))

		DRM_ERROR("Timed out waiting for forcewake to ack request.\n");

	/* WaRsForcewakeWaitTC0:ivb,hsw */

	__gen6_gt_wait_for_thread_c0(dev_priv);

}

static void gen6_gt_check_fifodbg(struct drm_i915_private *dev_priv)

{

	u32 gtfifodbg;

	gtfifodbg = __raw_i915_read32(dev_priv, GTFIFODBG);

	if (WARN(gtfifodbg & GT_FIFO_CPU_ERROR_MASK,

	     "MMIO read or write has been dropped %x\n", gtfifodbg))

		__raw_i915_write32(dev_priv, GTFIFODBG, GT_FIFO_CPU_ERROR_MASK);

}

static void __gen6_gt_force_wake_put(struct drm_i915_private *dev_priv)

{

	__raw_i915_write32(dev_priv, FORCEWAKE, 0);

	/* something from same cacheline, but !FORCEWAKE */

	__raw_posting_read(dev_priv, ECOBUS);

	gen6_gt_check_fifodbg(dev_priv);

}

static void __gen6_gt_force_wake_mt_put(struct drm_i915_private *dev_priv)

{

	__raw_i915_write32(dev_priv, FORCEWAKE_MT,

			   _MASKED_BIT_DISABLE(FORCEWAKE_KERNEL));

	/* something from same cacheline, but !FORCEWAKE_MT */

	__raw_posting_read(dev_priv, ECOBUS);

	gen6_gt_check_fifodbg(dev_priv);

}

static int __gen6_gt_wait_for_fifo(struct drm_i915_private *dev_priv)

{

	int ret = 0;

	if (dev_priv->uncore.fifo_count < GT_FIFO_NUM_RESERVED_ENTRIES) {

		int loop = 500;

		u32 fifo = __raw_i915_read32(dev_priv, GT_FIFO_FREE_ENTRIES);

		while (fifo <= GT_FIFO_NUM_RESERVED_ENTRIES && loop--) {

			udelay(10);

			fifo = __raw_i915_read32(dev_priv, GT_FIFO_FREE_ENTRIES);

		}

		if (WARN_ON(loop < 0 && fifo <= GT_FIFO_NUM_RESERVED_ENTRIES))

			++ret;

		dev_priv->uncore.fifo_count = fifo;

	}

	dev_priv->uncore.fifo_count--;

	return ret;

}

static void vlv_force_wake_reset(struct drm_i915_private *dev_priv)

{

	__raw_i915_write32(dev_priv, FORCEWAKE_VLV,

			   _MASKED_BIT_DISABLE(0xffff));

	/* something from same cacheline, but !FORCEWAKE_VLV */

	__raw_posting_read(dev_priv, FORCEWAKE_ACK_VLV);

}

static void vlv_force_wake_get(struct drm_i915_private *dev_priv)

{

	if (wait_for_atomic((__raw_i915_read32(dev_priv, FORCEWAKE_ACK_VLV) & FORCEWAKE_KERNEL) == 0,

			    FORCEWAKE_ACK_TIMEOUT_MS))

		DRM_ERROR("Timed out waiting for forcewake old ack to clear.\n");

	__raw_i915_write32(dev_priv, FORCEWAKE_VLV,

			   _MASKED_BIT_ENABLE(FORCEWAKE_KERNEL));

	__raw_i915_write32(dev_priv, FORCEWAKE_MEDIA_VLV,

			   _MASKED_BIT_ENABLE(FORCEWAKE_KERNEL));

	if (wait_for_atomic((__raw_i915_read32(dev_priv, FORCEWAKE_ACK_VLV) & FORCEWAKE_KERNEL),

			    FORCEWAKE_ACK_TIMEOUT_MS))

		DRM_ERROR("Timed out waiting for GT to ack forcewake request.\n");

	if (wait_for_atomic((__raw_i915_read32(dev_priv, FORCEWAKE_ACK_MEDIA_VLV) &

			     FORCEWAKE_KERNEL),

			    FORCEWAKE_ACK_TIMEOUT_MS))

		DRM_ERROR("Timed out waiting for media to ack forcewake request.\n");

	/* WaRsForcewakeWaitTC0:vlv */

	__gen6_gt_wait_for_thread_c0(dev_priv);

}

static void vlv_force_wake_put(struct drm_i915_private *dev_priv)

{

	__raw_i915_write32(dev_priv, FORCEWAKE_VLV,

			   _MASKED_BIT_DISABLE(FORCEWAKE_KERNEL));

	__raw_i915_write32(dev_priv, FORCEWAKE_MEDIA_VLV,

			   _MASKED_BIT_DISABLE(FORCEWAKE_KERNEL));

	/* The below doubles as a POSTING_READ */

	gen6_gt_check_fifodbg(dev_priv);

}

void intel_uncore_early_sanitize(struct drm_device *dev)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	if (HAS_FPGA_DBG_UNCLAIMED(dev))

		__raw_i915_write32(dev_priv, FPGA_DBG, FPGA_DBG_RM_NOCLAIM);

}

void intel_uncore_init(struct drm_device *dev)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	if (IS_VALLEYVIEW(dev)) {

		dev_priv->uncore.funcs.force_wake_get = vlv_force_wake_get;

		dev_priv->uncore.funcs.force_wake_put = vlv_force_wake_put;

	} else if (IS_HASWELL(dev)) {

		dev_priv->uncore.funcs.force_wake_get = __gen6_gt_force_wake_mt_get;

		dev_priv->uncore.funcs.force_wake_put = __gen6_gt_force_wake_mt_put;

	} else if (IS_IVYBRIDGE(dev)) {

		u32 ecobus;

		/* IVB configs may use multi-threaded forcewake */

		/* A small trick here - if the bios hasn't configured

		 * MT forcewake, and if the device is in RC6, then

		 * force_wake_mt_get will not wake the device and the

		 * ECOBUS read will return zero. Which will be

		 * (correctly) interpreted by the test below as MT

		 * forcewake being disabled.

		 */

		mutex_lock(&dev->struct_mutex);

		__gen6_gt_force_wake_mt_get(dev_priv);

		ecobus = __raw_i915_read32(dev_priv, ECOBUS);

		__gen6_gt_force_wake_mt_put(dev_priv);

		mutex_unlock(&dev->struct_mutex);

		if (ecobus & FORCEWAKE_MT_ENABLE) {

			dev_priv->uncore.funcs.force_wake_get =

				__gen6_gt_force_wake_mt_get;

			dev_priv->uncore.funcs.force_wake_put =

				__gen6_gt_force_wake_mt_put;

		} else {

			DRM_INFO("No MT forcewake available on Ivybridge, this can result in issues\n");

			DRM_INFO("when using vblank-synced partial screen updates.\n");

			dev_priv->uncore.funcs.force_wake_get =

				__gen6_gt_force_wake_get;

			dev_priv->uncore.funcs.force_wake_put =

				__gen6_gt_force_wake_put;

		}

	} else if (IS_GEN6(dev)) {

		dev_priv->uncore.funcs.force_wake_get =

			__gen6_gt_force_wake_get;

		dev_priv->uncore.funcs.force_wake_put =

			__gen6_gt_force_wake_put;

	}

}

static void intel_uncore_forcewake_reset(struct drm_device *dev)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	if (IS_VALLEYVIEW(dev)) {

		vlv_force_wake_reset(dev_priv);

	} else if (INTEL_INFO(dev)->gen >= 6) {

		__gen6_gt_force_wake_reset(dev_priv);

		if (IS_IVYBRIDGE(dev) || IS_HASWELL(dev))

			__gen6_gt_force_wake_mt_reset(dev_priv);

	}

}

void intel_uncore_sanitize(struct drm_device *dev)

{

	intel_uncore_forcewake_reset(dev);

	/* BIOS often leaves RC6 enabled, but disable it for hw init */

	intel_disable_gt_powersave(dev);

}

/*

 * Generally this is called implicitly by the register read function. However,

 * if some sequence requires the GT to not power down then this function should

 * be called at the beginning of the sequence followed by a call to

 * gen6_gt_force_wake_put() at the end of the sequence.

 */

void gen6_gt_force_wake_get(struct drm_i915_private *dev_priv)

{

	unsigned long irqflags;

	spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);

	if (dev_priv->uncore.forcewake_count++ == 0)

		dev_priv->uncore.funcs.force_wake_get(dev_priv);

	spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);

}

/*

 * see gen6_gt_force_wake_get()

 */

void gen6_gt_force_wake_put(struct drm_i915_private *dev_priv)

{

	unsigned long irqflags;

	spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);

	if (--dev_priv->uncore.forcewake_count == 0)

		dev_priv->uncore.funcs.force_wake_put(dev_priv);

	spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);

}

/* We give fast paths for the really cool registers */

#define NEEDS_FORCE_WAKE(dev_priv, reg) \

	((HAS_FORCE_WAKE((dev_priv)->dev)) && \

	 ((reg) < 0x40000) &&            \

	 ((reg) != FORCEWAKE))

static void

ilk_dummy_write(struct drm_i915_private *dev_priv)

{

	/* WaIssueDummyWriteToWakeupFromRC6:ilk Issue a dummy write to wake up

	 * the chip from rc6 before touching it for real. MI_MODE is masked,

	 * hence harmless to write 0 into. */

	__raw_i915_write32(dev_priv, MI_MODE, 0);

}

static void

hsw_unclaimed_reg_clear(struct drm_i915_private *dev_priv, u32 reg)

{

	if (HAS_FPGA_DBG_UNCLAIMED(dev_priv->dev) &&

	    (__raw_i915_read32(dev_priv, FPGA_DBG) & FPGA_DBG_RM_NOCLAIM)) {

		DRM_ERROR("Unknown unclaimed register before writing to %x\n",

			  reg);

		__raw_i915_write32(dev_priv, FPGA_DBG, FPGA_DBG_RM_NOCLAIM);

	}

}

static void

hsw_unclaimed_reg_check(struct drm_i915_private *dev_priv, u32 reg)

{

	if (HAS_FPGA_DBG_UNCLAIMED(dev_priv->dev) &&

	    (__raw_i915_read32(dev_priv, FPGA_DBG) & FPGA_DBG_RM_NOCLAIM)) {

		DRM_ERROR("Unclaimed write to %x\n", reg);

		__raw_i915_write32(dev_priv, FPGA_DBG, FPGA_DBG_RM_NOCLAIM);

	}

}

#define __i915_read(x) \

u##x i915_read##x(struct drm_i915_private *dev_priv, u32 reg, bool trace) { \

	unsigned long irqflags; \

	u##x val = 0; \

	spin_lock_irqsave(&dev_priv->uncore.lock, irqflags); \

	if (dev_priv->info->gen == 5) \

		ilk_dummy_write(dev_priv); \

	if (NEEDS_FORCE_WAKE((dev_priv), (reg))) { \

		if (dev_priv->uncore.forcewake_count == 0) \

			dev_priv->uncore.funcs.force_wake_get(dev_priv); \

		val = __raw_i915_read##x(dev_priv, reg); \

		if (dev_priv->uncore.forcewake_count == 0) \

			dev_priv->uncore.funcs.force_wake_put(dev_priv); \

	} else { \

		val = __raw_i915_read##x(dev_priv, reg); \

	} \

	spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags); \

	trace_i915_reg_rw(false, reg, val, sizeof(val), trace); \

    return val; \

}

__i915_read(8)

__i915_read(16)

__i915_read(32)

__i915_read(64)

#undef __i915_read

#define __i915_write(x) \

void i915_write##x(struct drm_i915_private *dev_priv, u32 reg, u##x val, bool trace) { \

	unsigned long irqflags; \

	u32 __fifo_ret = 0; \

	trace_i915_reg_rw(true, reg, val, sizeof(val), trace); \

    spin_lock_irqsave(&dev_priv->uncore.lock, irqflags); \

	if (NEEDS_FORCE_WAKE((dev_priv), (reg))) { \

		__fifo_ret = __gen6_gt_wait_for_fifo(dev_priv); \

	} \

	if (dev_priv->info->gen == 5) \

		ilk_dummy_write(dev_priv); \

	hsw_unclaimed_reg_clear(dev_priv, reg); \

	__raw_i915_write##x(dev_priv, reg, val); \

	if (unlikely(__fifo_ret)) { \

		gen6_gt_check_fifodbg(dev_priv); \

	} \

	hsw_unclaimed_reg_check(dev_priv, reg); \

	spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags); \

}

__i915_write(8)

__i915_write(16)

__i915_write(32)

__i915_write(64)

#undef __i915_write

static const struct register_whitelist {

	uint64_t offset;

	uint32_t size;

	uint32_t gen_bitmask; /* support gens, 0x10 for 4, 0x30 for 4 and 5, etc. */

} whitelist[] = {

	{ RING_TIMESTAMP(RENDER_RING_BASE), 8, 0xF0 },

};

int i915_reg_read_ioctl(struct drm_device *dev,

			void *data, struct drm_file *file)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	struct drm_i915_reg_read *reg = data;

	struct register_whitelist const *entry = whitelist;

	int i;

	for (i = 0; i < ARRAY_SIZE(whitelist); i++, entry++) {

		if (entry->offset == reg->offset &&

		    (1 << INTEL_INFO(dev)->gen & entry->gen_bitmask))

			break;

	}

	if (i == ARRAY_SIZE(whitelist))

		return -EINVAL;

	switch (entry->size) {

	case 8:

		reg->val = I915_READ64(reg->offset);

		break;

	case 4:

		reg->val = I915_READ(reg->offset);

		break;

	case 2:

		reg->val = I915_READ16(reg->offset);

		break;

	case 1:

		reg->val = I915_READ8(reg->offset);

		break;

	default:

		WARN_ON(1);

		return -EINVAL;

	}

	return 0;

}

static int i8xx_do_reset(struct drm_device *dev)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	if (IS_I85X(dev))

		return -ENODEV;

	I915_WRITE(D_STATE, I915_READ(D_STATE) | DSTATE_GFX_RESET_I830);

	POSTING_READ(D_STATE);

	if (IS_I830(dev) || IS_845G(dev)) {

		I915_WRITE(DEBUG_RESET_I830,

			   DEBUG_RESET_DISPLAY |

			   DEBUG_RESET_RENDER |

			   DEBUG_RESET_FULL);

		POSTING_READ(DEBUG_RESET_I830);

		msleep(1);

		I915_WRITE(DEBUG_RESET_I830, 0);

		POSTING_READ(DEBUG_RESET_I830);

	}

	msleep(1);

	I915_WRITE(D_STATE, I915_READ(D_STATE) & ~DSTATE_GFX_RESET_I830);

	POSTING_READ(D_STATE);

	return 0;

}

static int i965_reset_complete(struct drm_device *dev)

{

	u8 gdrst;

	pci_read_config_byte(dev->pdev, I965_GDRST, &gdrst);

	return (gdrst & GRDOM_RESET_ENABLE) == 0;

}

static int i965_do_reset(struct drm_device *dev)

{

	int ret;

	/*

	 * Set the domains we want to reset (GRDOM/bits 2 and 3) as

	 * well as the reset bit (GR/bit 0).  Setting the GR bit

	 * triggers the reset; when done, the hardware will clear it.

	 */

	pci_write_config_byte(dev->pdev, I965_GDRST,

			      GRDOM_RENDER | GRDOM_RESET_ENABLE);

	ret =  wait_for(i965_reset_complete(dev), 500);

	if (ret)

		return ret;

	/* We can't reset render&media without also resetting display ... */

	pci_write_config_byte(dev->pdev, I965_GDRST,

			      GRDOM_MEDIA | GRDOM_RESET_ENABLE);

	ret =  wait_for(i965_reset_complete(dev), 500);

	if (ret)

		return ret;

	pci_write_config_byte(dev->pdev, I965_GDRST, 0);

	return 0;

}

static int ironlake_do_reset(struct drm_device *dev)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	u32 gdrst;

	int ret;

	gdrst = I915_READ(MCHBAR_MIRROR_BASE + ILK_GDSR);

	gdrst &= ~GRDOM_MASK;

	I915_WRITE(MCHBAR_MIRROR_BASE + ILK_GDSR,

		   gdrst | GRDOM_RENDER | GRDOM_RESET_ENABLE);

	ret = wait_for(I915_READ(MCHBAR_MIRROR_BASE + ILK_GDSR) & 0x1, 500);

	if (ret)

		return ret;

	/* We can't reset render&media without also resetting display ... */

	gdrst = I915_READ(MCHBAR_MIRROR_BASE + ILK_GDSR);

	gdrst &= ~GRDOM_MASK;

	I915_WRITE(MCHBAR_MIRROR_BASE + ILK_GDSR,

		   gdrst | GRDOM_MEDIA | GRDOM_RESET_ENABLE);

	return wait_for(I915_READ(MCHBAR_MIRROR_BASE + ILK_GDSR) & 0x1, 500);

}

static int gen6_do_reset(struct drm_device *dev)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	int	ret;

	unsigned long irqflags;

	/* Hold uncore.lock across reset to prevent any register access

	 * with forcewake not set correctly

	 */

	spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);

	/* Reset the chip */

	/* GEN6_GDRST is not in the gt power well, no need to check

	 * for fifo space for the write or forcewake the chip for

	 * the read

	 */

	__raw_i915_write32(dev_priv, GEN6_GDRST, GEN6_GRDOM_FULL);

	/* Spin waiting for the device to ack the reset request */

	ret = wait_for((__raw_i915_read32(dev_priv, GEN6_GDRST) & GEN6_GRDOM_FULL) == 0, 500);

	intel_uncore_forcewake_reset(dev);

	/* If reset with a user forcewake, try to restore, otherwise turn it off */

	if (dev_priv->uncore.forcewake_count)

		dev_priv->uncore.funcs.force_wake_get(dev_priv);

	else

		dev_priv->uncore.funcs.force_wake_put(dev_priv);

	/* Restore fifo count */

	dev_priv->uncore.fifo_count = __raw_i915_read32(dev_priv, GT_FIFO_FREE_ENTRIES);

	spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);

	return ret;

}

int intel_gpu_reset(struct drm_device *dev)

{

	switch (INTEL_INFO(dev)->gen) {

	case 7:

	case 6: return gen6_do_reset(dev);

	case 5: return ironlake_do_reset(dev);

	case 4: return i965_do_reset(dev);

	case 2: return i8xx_do_reset(dev);

	default: return -ENODEV;

	}

}

void intel_uncore_clear_errors(struct drm_device *dev)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	/* XXX needs spinlock around caller's grouping */

	if (HAS_FPGA_DBG_UNCLAIMED(dev))

		__raw_i915_write32(dev_priv, FPGA_DBG, FPGA_DBG_RM_NOCLAIM);

}

void intel_uncore_check_errors(struct drm_device *dev)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	if (HAS_FPGA_DBG_UNCLAIMED(dev) &&

	    (__raw_i915_read32(dev_priv, FPGA_DBG) & FPGA_DBG_RM_NOCLAIM)) {

		DRM_ERROR("Unclaimed register before interrupt\n");

		__raw_i915_write32(dev_priv, FPGA_DBG, FPGA_DBG_RM_NOCLAIM);

	}

}