[PATCH 05/12] drm/etnaviv: add GPU core driver

[Lucas Stach <l.stach@pengutronix.de>]

From: The etnaviv authors <dri-devel@lists.freedesktop.org>

This adds the GPU core driver part of the etnaviv DRM driver.

Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
---
 drivers/gpu/drm/etnaviv/etnaviv_gpu.c | 1644 +++++++++++++++++++++++++++++++++
 drivers/gpu/drm/etnaviv/etnaviv_gpu.h |  209 +++++
 2 files changed, 1853 insertions(+)
 create mode 100644 drivers/gpu/drm/etnaviv/etnaviv_gpu.c
 create mode 100644 drivers/gpu/drm/etnaviv/etnaviv_gpu.h

diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
new file mode 100644
index 000000000000..d39093dc37e6
--- /dev/null
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
@@ -0,0 +1,1644 @@
+/*
+ * Copyright (C) 2015 Etnaviv Project
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/component.h>
+#include <linux/fence.h>
+#include <linux/moduleparam.h>
+#include <linux/of_device.h>
+#include "etnaviv_dump.h"
+#include "etnaviv_gpu.h"
+#include "etnaviv_gem.h"
+#include "etnaviv_mmu.h"
+#include "etnaviv_iommu.h"
+#include "etnaviv_iommu_v2.h"
+#include "common.xml.h"
+#include "state.xml.h"
+#include "state_hi.xml.h"
+#include "cmdstream.xml.h"
+
+static const struct platform_device_id gpu_ids[] = {
+	{ .name = "etnaviv-gpu,2d" },
+	{ },
+};
+
+static bool etnaviv_dump_core = true;
+module_param_named(dump_core, etnaviv_dump_core, bool, 0600);
+
+/*
+ * Driver functions:
+ */
+
+int etnaviv_gpu_get_param(struct etnaviv_gpu *gpu, u32 param, u64 *value)
+{
+	switch (param) {
+	case ETNAVIV_PARAM_GPU_MODEL:
+		*value = gpu->identity.model;
+		break;
+
+	case ETNAVIV_PARAM_GPU_REVISION:
+		*value = gpu->identity.revision;
+		break;
+
+	case ETNAVIV_PARAM_GPU_FEATURES_0:
+		*value = gpu->identity.features;
+		break;
+
+	case ETNAVIV_PARAM_GPU_FEATURES_1:
+		*value = gpu->identity.minor_features0;
+		break;
+
+	case ETNAVIV_PARAM_GPU_FEATURES_2:
+		*value = gpu->identity.minor_features1;
+		break;
+
+	case ETNAVIV_PARAM_GPU_FEATURES_3:
+		*value = gpu->identity.minor_features2;
+		break;
+
+	case ETNAVIV_PARAM_GPU_FEATURES_4:
+		*value = gpu->identity.minor_features3;
+		break;
+
+	case ETNAVIV_PARAM_GPU_STREAM_COUNT:
+		*value = gpu->identity.stream_count;
+		break;
+
+	case ETNAVIV_PARAM_GPU_REGISTER_MAX:
+		*value = gpu->identity.register_max;
+		break;
+
+	case ETNAVIV_PARAM_GPU_THREAD_COUNT:
+		*value = gpu->identity.thread_count;
+		break;
+
+	case ETNAVIV_PARAM_GPU_VERTEX_CACHE_SIZE:
+		*value = gpu->identity.vertex_cache_size;
+		break;
+
+	case ETNAVIV_PARAM_GPU_SHADER_CORE_COUNT:
+		*value = gpu->identity.shader_core_count;
+		break;
+
+	case ETNAVIV_PARAM_GPU_PIXEL_PIPES:
+		*value = gpu->identity.pixel_pipes;
+		break;
+
+	case ETNAVIV_PARAM_GPU_VERTEX_OUTPUT_BUFFER_SIZE:
+		*value = gpu->identity.vertex_output_buffer_size;
+		break;
+
+	case ETNAVIV_PARAM_GPU_BUFFER_SIZE:
+		*value = gpu->identity.buffer_size;
+		break;
+
+	case ETNAVIV_PARAM_GPU_INSTRUCTION_COUNT:
+		*value = gpu->identity.instruction_count;
+		break;
+
+	case ETNAVIV_PARAM_GPU_NUM_CONSTANTS:
+		*value = gpu->identity.num_constants;
+		break;
+
+	default:
+		DBG("%s: invalid param: %u", dev_name(gpu->dev), param);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static void etnaviv_hw_specs(struct etnaviv_gpu *gpu)
+{
+	if (gpu->identity.minor_features0 &
+	    chipMinorFeatures0_MORE_MINOR_FEATURES) {
+		u32 specs[2];
+
+		specs[0] = gpu_read(gpu, VIVS_HI_CHIP_SPECS);
+		specs[1] = gpu_read(gpu, VIVS_HI_CHIP_SPECS_2);
+
+		gpu->identity.stream_count =
+			(specs[0] & VIVS_HI_CHIP_SPECS_STREAM_COUNT__MASK)
+				>> VIVS_HI_CHIP_SPECS_STREAM_COUNT__SHIFT;
+		gpu->identity.register_max =
+			(specs[0] & VIVS_HI_CHIP_SPECS_REGISTER_MAX__MASK)
+				>> VIVS_HI_CHIP_SPECS_REGISTER_MAX__SHIFT;
+		gpu->identity.thread_count =
+			(specs[0] & VIVS_HI_CHIP_SPECS_THREAD_COUNT__MASK)
+				>> VIVS_HI_CHIP_SPECS_THREAD_COUNT__SHIFT;
+		gpu->identity.vertex_cache_size =
+			(specs[0] & VIVS_HI_CHIP_SPECS_VERTEX_CACHE_SIZE__MASK)
+				>> VIVS_HI_CHIP_SPECS_VERTEX_CACHE_SIZE__SHIFT;
+		gpu->identity.shader_core_count =
+			(specs[0] & VIVS_HI_CHIP_SPECS_SHADER_CORE_COUNT__MASK)
+				>> VIVS_HI_CHIP_SPECS_SHADER_CORE_COUNT__SHIFT;
+		gpu->identity.pixel_pipes =
+			(specs[0] & VIVS_HI_CHIP_SPECS_PIXEL_PIPES__MASK)
+				>> VIVS_HI_CHIP_SPECS_PIXEL_PIPES__SHIFT;
+		gpu->identity.vertex_output_buffer_size =
+			(specs[0] & VIVS_HI_CHIP_SPECS_VERTEX_OUTPUT_BUFFER_SIZE__MASK)
+				>> VIVS_HI_CHIP_SPECS_VERTEX_OUTPUT_BUFFER_SIZE__SHIFT;
+
+		gpu->identity.buffer_size =
+			(specs[1] & VIVS_HI_CHIP_SPECS_2_BUFFER_SIZE__MASK)
+				>> VIVS_HI_CHIP_SPECS_2_BUFFER_SIZE__SHIFT;
+		gpu->identity.instruction_count =
+			(specs[1] & VIVS_HI_CHIP_SPECS_2_INSTRUCTION_COUNT__MASK)
+				>> VIVS_HI_CHIP_SPECS_2_INSTRUCTION_COUNT__SHIFT;
+		gpu->identity.num_constants =
+			(specs[1] & VIVS_HI_CHIP_SPECS_2_NUM_CONSTANTS__MASK)
+				>> VIVS_HI_CHIP_SPECS_2_NUM_CONSTANTS__SHIFT;
+	}
+
+	/* Fill in the stream count if not specified */
+	if (gpu->identity.stream_count == 0) {
+		if (gpu->identity.model >= 0x1000)
+			gpu->identity.stream_count = 4;
+		else
+			gpu->identity.stream_count = 1;
+	}
+
+	/* Convert the register max value */
+	if (gpu->identity.register_max)
+		gpu->identity.register_max = 1 << gpu->identity.register_max;
+	else if (gpu->identity.model == 0x0400)
+		gpu->identity.register_max = 32;
+	else
+		gpu->identity.register_max = 64;
+
+	/* Convert thread count */
+	if (gpu->identity.thread_count)
+		gpu->identity.thread_count = 1 << gpu->identity.thread_count;
+	else if (gpu->identity.model == 0x0400)
+		gpu->identity.thread_count = 64;
+	else if (gpu->identity.model == 0x0500 ||
+		 gpu->identity.model == 0x0530)
+		gpu->identity.thread_count = 128;
+	else
+		gpu->identity.thread_count = 256;
+
+	if (gpu->identity.vertex_cache_size == 0)
+		gpu->identity.vertex_cache_size = 8;
+
+	if (gpu->identity.shader_core_count == 0) {
+		if (gpu->identity.model >= 0x1000)
+			gpu->identity.shader_core_count = 2;
+		else
+			gpu->identity.shader_core_count = 1;
+	}
+
+	if (gpu->identity.pixel_pipes == 0)
+		gpu->identity.pixel_pipes = 1;
+
+	/* Convert virtex buffer size */
+	if (gpu->identity.vertex_output_buffer_size) {
+		gpu->identity.vertex_output_buffer_size =
+			1 << gpu->identity.vertex_output_buffer_size;
+	} else if (gpu->identity.model == 0x0400) {
+		if (gpu->identity.revision < 0x4000)
+			gpu->identity.vertex_output_buffer_size = 512;
+		else if (gpu->identity.revision < 0x4200)
+			gpu->identity.vertex_output_buffer_size = 256;
+		else
+			gpu->identity.vertex_output_buffer_size = 128;
+	} else {
+		gpu->identity.vertex_output_buffer_size = 512;
+	}
+
+	switch (gpu->identity.instruction_count) {
+	case 0:
+		if ((gpu->identity.model == 0x2000 &&
+		     gpu->identity.revision == 0x5108) ||
+		    gpu->identity.model == 0x880)
+			gpu->identity.instruction_count = 512;
+		else
+			gpu->identity.instruction_count = 256;
+		break;
+
+	case 1:
+		gpu->identity.instruction_count = 1024;
+		break;
+
+	case 2:
+		gpu->identity.instruction_count = 2048;
+		break;
+
+	default:
+		gpu->identity.instruction_count = 256;
+		break;
+	}
+
+	if (gpu->identity.num_constants == 0)
+		gpu->identity.num_constants = 168;
+}
+
+static void etnaviv_hw_identify(struct etnaviv_gpu *gpu)
+{
+	u32 chipIdentity;
+
+	chipIdentity = gpu_read(gpu, VIVS_HI_CHIP_IDENTITY);
+
+	/* Special case for older graphic cores. */
+	if (VIVS_HI_CHIP_IDENTITY_FAMILY(chipIdentity) ==  0x01) {
+		gpu->identity.model    = 0x500; /* gc500 */
+		gpu->identity.revision = VIVS_HI_CHIP_IDENTITY_REVISION(chipIdentity);
+	} else {
+
+		gpu->identity.model = gpu_read(gpu, VIVS_HI_CHIP_MODEL);
+		gpu->identity.revision = gpu_read(gpu, VIVS_HI_CHIP_REV);
+
+		/*
+		 * !!!! HACK ALERT !!!!
+		 * Because people change device IDs without letting software
+		 * know about it - here is the hack to make it all look the
+		 * same.  Only for GC400 family.
+		 */
+		if ((gpu->identity.model & 0xff00) == 0x0400 &&
+		    gpu->identity.model != 0x0420) {
+			gpu->identity.model = gpu->identity.model & 0x0400;
+		}
+
+		/* Another special case */
+		if (gpu->identity.model == 0x300 &&
+		    gpu->identity.revision == 0x2201) {
+			u32 chipDate = gpu_read(gpu, VIVS_HI_CHIP_DATE);
+			u32 chipTime = gpu_read(gpu, VIVS_HI_CHIP_TIME);
+
+			if (chipDate == 0x20080814 && chipTime == 0x12051100) {
+				/*
+				 * This IP has an ECO; put the correct
+				 * revision in it.
+				 */
+				gpu->identity.revision = 0x1051;
+			}
+		}
+	}
+
+	dev_info(gpu->dev, "model: GC%x, revision: %x\n",
+		 gpu->identity.model, gpu->identity.revision);
+
+	gpu->identity.features = gpu_read(gpu, VIVS_HI_CHIP_FEATURE);
+
+	/* Disable fast clear on GC700. */
+	if (gpu->identity.model == 0x700)
+		gpu->identity.features &= ~chipFeatures_FAST_CLEAR;
+
+	if ((gpu->identity.model == 0x500 && gpu->identity.revision < 2) ||
+	    (gpu->identity.model == 0x300 && gpu->identity.revision < 0x2000)) {
+
+		/*
+		 * GC500 rev 1.x and GC300 rev < 2.0 doesn't have these
+		 * registers.
+		 */
+		gpu->identity.minor_features0 = 0;
+		gpu->identity.minor_features1 = 0;
+		gpu->identity.minor_features2 = 0;
+		gpu->identity.minor_features3 = 0;
+	} else
+		gpu->identity.minor_features0 =
+				gpu_read(gpu, VIVS_HI_CHIP_MINOR_FEATURE_0);
+
+	if (gpu->identity.minor_features0 &
+	    chipMinorFeatures0_MORE_MINOR_FEATURES) {
+		gpu->identity.minor_features1 =
+				gpu_read(gpu, VIVS_HI_CHIP_MINOR_FEATURE_1);
+		gpu->identity.minor_features2 =
+				gpu_read(gpu, VIVS_HI_CHIP_MINOR_FEATURE_2);
+		gpu->identity.minor_features3 =
+				gpu_read(gpu, VIVS_HI_CHIP_MINOR_FEATURE_3);
+	}
+
+	/* GC600 idle register reports zero bits where modules aren't present */
+	if (gpu->identity.model == chipModel_GC600) {
+		gpu->idle_mask = VIVS_HI_IDLE_STATE_TX |
+				 VIVS_HI_IDLE_STATE_RA |
+				 VIVS_HI_IDLE_STATE_SE |
+				 VIVS_HI_IDLE_STATE_PA |
+				 VIVS_HI_IDLE_STATE_SH |
+				 VIVS_HI_IDLE_STATE_PE |
+				 VIVS_HI_IDLE_STATE_DE |
+				 VIVS_HI_IDLE_STATE_FE;
+	} else {
+		gpu->idle_mask = ~VIVS_HI_IDLE_STATE_AXI_LP;
+	}
+
+	etnaviv_hw_specs(gpu);
+}
+
+static void etnaviv_gpu_load_clock(struct etnaviv_gpu *gpu, u32 clock)
+{
+	gpu_write(gpu, VIVS_HI_CLOCK_CONTROL, clock |
+		  VIVS_HI_CLOCK_CONTROL_FSCALE_CMD_LOAD);
+	gpu_write(gpu, VIVS_HI_CLOCK_CONTROL, clock);
+}
+
+static int etnaviv_hw_reset(struct etnaviv_gpu *gpu)
+{
+	u32 control, idle;
+	unsigned long timeout;
+	bool failed = true;
+
+	/* TODO
+	 *
+	 * - clock gating
+	 * - puls eater
+	 * - what about VG?
+	 */
+
+	/* We hope that the GPU resets in under one second */
+	timeout = jiffies + msecs_to_jiffies(1000);
+
+	while (time_is_after_jiffies(timeout)) {
+		control = VIVS_HI_CLOCK_CONTROL_DISABLE_DEBUG_REGISTERS |
+			  VIVS_HI_CLOCK_CONTROL_FSCALE_VAL(0x40);
+
+		/* enable clock */
+		etnaviv_gpu_load_clock(gpu, control);
+
+		/* Wait for stable clock.  Vivante's code waited for 1ms */
+		usleep_range(1000, 10000);
+
+		/* isolate the GPU. */
+		control |= VIVS_HI_CLOCK_CONTROL_ISOLATE_GPU;
+		gpu_write(gpu, VIVS_HI_CLOCK_CONTROL, control);
+
+		/* set soft reset. */
+		control |= VIVS_HI_CLOCK_CONTROL_SOFT_RESET;
+		gpu_write(gpu, VIVS_HI_CLOCK_CONTROL, control);
+
+		/* wait for reset. */
+		msleep(1);
+
+		/* reset soft reset bit. */
+		control &= ~VIVS_HI_CLOCK_CONTROL_SOFT_RESET;
+		gpu_write(gpu, VIVS_HI_CLOCK_CONTROL, control);
+
+		/* reset GPU isolation. */
+		control &= ~VIVS_HI_CLOCK_CONTROL_ISOLATE_GPU;
+		gpu_write(gpu, VIVS_HI_CLOCK_CONTROL, control);
+
+		/* read idle register. */
+		idle = gpu_read(gpu, VIVS_HI_IDLE_STATE);
+
+		/* try reseting again if FE it not idle */
+		if ((idle & VIVS_HI_IDLE_STATE_FE) == 0) {
+			dev_dbg(gpu->dev, "FE is not idle\n");
+			continue;
+		}
+
+		/* read reset register. */
+		control = gpu_read(gpu, VIVS_HI_CLOCK_CONTROL);
+
+		/* is the GPU idle? */
+		if (((control & VIVS_HI_CLOCK_CONTROL_IDLE_3D) == 0) ||
+		    ((control & VIVS_HI_CLOCK_CONTROL_IDLE_2D) == 0)) {
+			dev_dbg(gpu->dev, "GPU is not idle\n");
+			continue;
+		}
+
+		failed = false;
+		break;
+	}
+
+	if (failed) {
+		idle = gpu_read(gpu, VIVS_HI_IDLE_STATE);
+		control = gpu_read(gpu, VIVS_HI_CLOCK_CONTROL);
+
+		dev_err(gpu->dev, "GPU failed to reset: FE %sidle, 3D %sidle, 2D %sidle\n",
+			idle & VIVS_HI_IDLE_STATE_FE ? "" : "not ",
+			control & VIVS_HI_CLOCK_CONTROL_IDLE_3D ? "" : "not ",
+			control & VIVS_HI_CLOCK_CONTROL_IDLE_2D ? "" : "not ");
+
+		return -EBUSY;
+	}
+
+	/* We rely on the GPU running, so program the clock */
+	control = VIVS_HI_CLOCK_CONTROL_DISABLE_DEBUG_REGISTERS |
+		  VIVS_HI_CLOCK_CONTROL_FSCALE_VAL(0x40);
+
+	/* enable clock */
+	etnaviv_gpu_load_clock(gpu, control);
+
+	return 0;
+}
+
+static void etnaviv_gpu_hw_init(struct etnaviv_gpu *gpu)
+{
+	u16 prefetch;
+
+	if (gpu->identity.model == chipModel_GC320 &&
+	    gpu_read(gpu, VIVS_HI_CHIP_TIME) != 0x2062400 &&
+	    (gpu->identity.revision == 0x5007 ||
+	     gpu->identity.revision == 0x5220)) {
+		u32 mc_memory_debug;
+
+		mc_memory_debug = gpu_read(gpu, VIVS_MC_DEBUG_MEMORY) & ~0xff;
+
+		if (gpu->identity.revision == 0x5007)
+			mc_memory_debug |= 0x0c;
+		else
+			mc_memory_debug |= 0x08;
+
+		gpu_write(gpu, VIVS_MC_DEBUG_MEMORY, mc_memory_debug);
+	}
+
+	/*
+	 * Update GPU AXI cache atttribute to "cacheable, no allocate".
+	 * This is necessary to prevent the iMX6 SoC locking up.
+	 */
+	gpu_write(gpu, VIVS_HI_AXI_CONFIG,
+		  VIVS_HI_AXI_CONFIG_AWCACHE(2) |
+		  VIVS_HI_AXI_CONFIG_ARCACHE(2));
+
+	/* GC2000 rev 5108 needs a special bus config */
+	if (gpu->identity.model == 0x2000 && gpu->identity.revision == 0x5108) {
+		u32 bus_config = gpu_read(gpu, VIVS_MC_BUS_CONFIG);
+		bus_config &= ~(VIVS_MC_BUS_CONFIG_FE_BUS_CONFIG__MASK |
+				VIVS_MC_BUS_CONFIG_TX_BUS_CONFIG__MASK);
+		bus_config |= VIVS_MC_BUS_CONFIG_FE_BUS_CONFIG(1) |
+			      VIVS_MC_BUS_CONFIG_TX_BUS_CONFIG(0);
+		gpu_write(gpu, VIVS_MC_BUS_CONFIG, bus_config);
+	}
+
+	/* set base addresses */
+	gpu_write(gpu, VIVS_MC_MEMORY_BASE_ADDR_RA, gpu->memory_base);
+	gpu_write(gpu, VIVS_MC_MEMORY_BASE_ADDR_FE, gpu->memory_base);
+	gpu_write(gpu, VIVS_MC_MEMORY_BASE_ADDR_TX, gpu->memory_base);
+	gpu_write(gpu, VIVS_MC_MEMORY_BASE_ADDR_PEZ, gpu->memory_base);
+	gpu_write(gpu, VIVS_MC_MEMORY_BASE_ADDR_PE, gpu->memory_base);
+
+	/* setup the MMU page table pointers */
+	etnaviv_iommu_domain_restore(gpu, gpu->mmu->domain);
+
+	/* Start command processor */
+	prefetch = etnaviv_buffer_init(gpu);
+
+	gpu_write(gpu, VIVS_HI_INTR_ENBL, ~0U);
+	gpu_write(gpu, VIVS_FE_COMMAND_ADDRESS,
+		  gpu->buffer->paddr - gpu->memory_base);
+	gpu_write(gpu, VIVS_FE_COMMAND_CONTROL,
+		  VIVS_FE_COMMAND_CONTROL_ENABLE |
+		  VIVS_FE_COMMAND_CONTROL_PREFETCH(prefetch));
+}
+
+int etnaviv_gpu_init(struct etnaviv_gpu *gpu)
+{
+	int ret, i;
+	struct iommu_domain *iommu;
+	enum etnaviv_iommu_version version;
+	bool mmuv2;
+
+	ret = pm_runtime_get_sync(gpu->dev);
+	if (ret < 0)
+		return ret;
+
+	etnaviv_hw_identify(gpu);
+
+	if (gpu->identity.model == 0) {
+		dev_err(gpu->dev, "Unknown GPU model\n");
+		pm_runtime_put_autosuspend(gpu->dev);
+		return -ENXIO;
+	}
+
+	ret = etnaviv_hw_reset(gpu);
+	if (ret)
+		goto fail;
+
+	/* Setup IOMMU.. eventually we will (I think) do this once per context
+	 * and have separate page tables per context.  For now, to keep things
+	 * simple and to get something working, just use a single address space:
+	 */
+	mmuv2 = gpu->identity.minor_features1 & chipMinorFeatures1_MMU_VERSION;
+	dev_dbg(gpu->dev, "mmuv2: %d\n", mmuv2);
+
+	if (!mmuv2) {
+		iommu = etnaviv_iommu_domain_alloc(gpu);
+		version = ETNAVIV_IOMMU_V1;
+	} else {
+		iommu = etnaviv_iommu_v2_domain_alloc(gpu);
+		version = ETNAVIV_IOMMU_V2;
+	}
+
+	if (!iommu) {
+		ret = -ENOMEM;
+		goto fail;
+	}
+
+	/* TODO: we will leak here memory - fix it! */
+
+	gpu->mmu = etnaviv_iommu_new(gpu, iommu, version);
+	if (!gpu->mmu) {
+		ret = -ENOMEM;
+		goto fail;
+	}
+
+	/* Create buffer: */
+	gpu->buffer = etnaviv_gpu_cmdbuf_new(gpu, PAGE_SIZE, 0);
+	if (!gpu->buffer) {
+		ret = -ENOMEM;
+		dev_err(gpu->dev, "could not create command buffer\n");
+		goto fail;
+	}
+	if (gpu->buffer->paddr - gpu->memory_base > 0x80000000) {
+		ret = -EINVAL;
+		dev_err(gpu->dev,
+			"command buffer outside valid memory window\n");
+		goto free_buffer;
+	}
+
+	/* Setup event management */
+	spin_lock_init(&gpu->event_spinlock);
+	init_completion(&gpu->event_free);
+	for (i = 0; i < ARRAY_SIZE(gpu->event); i++) {
+		gpu->event[i].used = false;
+		complete(&gpu->event_free);
+	}
+
+	/* Now program the hardware */
+	mutex_lock(&gpu->lock);
+	etnaviv_gpu_hw_init(gpu);
+	mutex_unlock(&gpu->lock);
+
+	pm_runtime_mark_last_busy(gpu->dev);
+	pm_runtime_put_autosuspend(gpu->dev);
+
+	return 0;
+
+free_buffer:
+	etnaviv_gpu_cmdbuf_free(gpu->buffer);
+	gpu->buffer = NULL;
+fail:
+	pm_runtime_mark_last_busy(gpu->dev);
+	pm_runtime_put_autosuspend(gpu->dev);
+
+	return ret;
+}
+
+#ifdef CONFIG_DEBUG_FS
+struct dma_debug {
+	u32 address[2];
+	u32 state[2];
+};
+
+static void verify_dma(struct etnaviv_gpu *gpu, struct dma_debug *debug)
+{
+	u32 i;
+
+	debug->address[0] = gpu_read(gpu, VIVS_FE_DMA_ADDRESS);
+	debug->state[0]   = gpu_read(gpu, VIVS_FE_DMA_DEBUG_STATE);
+
+	for (i = 0; i < 500; i++) {
+		debug->address[1] = gpu_read(gpu, VIVS_FE_DMA_ADDRESS);
+		debug->state[1]   = gpu_read(gpu, VIVS_FE_DMA_DEBUG_STATE);
+
+		if (debug->address[0] != debug->address[1])
+			break;
+
+		if (debug->state[0] != debug->state[1])
+			break;
+	}
+}
+
+int etnaviv_gpu_debugfs(struct etnaviv_gpu *gpu, struct seq_file *m)
+{
+	struct dma_debug debug;
+	u32 dma_lo, dma_hi, axi, idle;
+	int ret;
+
+	seq_printf(m, "%s Status:\n", dev_name(gpu->dev));
+
+	ret = pm_runtime_get_sync(gpu->dev);
+	if (ret < 0)
+		return ret;
+
+	dma_lo = gpu_read(gpu, VIVS_FE_DMA_LOW);
+	dma_hi = gpu_read(gpu, VIVS_FE_DMA_HIGH);
+	axi = gpu_read(gpu, VIVS_HI_AXI_STATUS);
+	idle = gpu_read(gpu, VIVS_HI_IDLE_STATE);
+
+	verify_dma(gpu, &debug);
+
+	seq_puts(m, "\tfeatures\n");
+	seq_printf(m, "\t minor_features0: 0x%08x\n",
+		   gpu->identity.minor_features0);
+	seq_printf(m, "\t minor_features1: 0x%08x\n",
+		   gpu->identity.minor_features1);
+	seq_printf(m, "\t minor_features2: 0x%08x\n",
+		   gpu->identity.minor_features2);
+	seq_printf(m, "\t minor_features3: 0x%08x\n",
+		   gpu->identity.minor_features3);
+
+	seq_puts(m, "\tspecs\n");
+	seq_printf(m, "\t stream_count:  %d\n",
+			gpu->identity.stream_count);
+	seq_printf(m, "\t register_max: %d\n",
+			gpu->identity.register_max);
+	seq_printf(m, "\t thread_count: %d\n",
+			gpu->identity.thread_count);
+	seq_printf(m, "\t vertex_cache_size: %d\n",
+			gpu->identity.vertex_cache_size);
+	seq_printf(m, "\t shader_core_count: %d\n",
+			gpu->identity.shader_core_count);
+	seq_printf(m, "\t pixel_pipes: %d\n",
+			gpu->identity.pixel_pipes);
+	seq_printf(m, "\t vertex_output_buffer_size: %d\n",
+			gpu->identity.vertex_output_buffer_size);
+	seq_printf(m, "\t buffer_size: %d\n",
+			gpu->identity.buffer_size);
+	seq_printf(m, "\t instruction_count: %d\n",
+			gpu->identity.instruction_count);
+	seq_printf(m, "\t num_constants: %d\n",
+			gpu->identity.num_constants);
+
+	seq_printf(m, "\taxi: 0x%08x\n", axi);
+	seq_printf(m, "\tidle: 0x%08x\n", idle);
+	idle |= ~gpu->idle_mask & ~VIVS_HI_IDLE_STATE_AXI_LP;
+	if ((idle & VIVS_HI_IDLE_STATE_FE) == 0)
+		seq_puts(m, "\t FE is not idle\n");
+	if ((idle & VIVS_HI_IDLE_STATE_DE) == 0)
+		seq_puts(m, "\t DE is not idle\n");
+	if ((idle & VIVS_HI_IDLE_STATE_PE) == 0)
+		seq_puts(m, "\t PE is not idle\n");
+	if ((idle & VIVS_HI_IDLE_STATE_SH) == 0)
+		seq_puts(m, "\t SH is not idle\n");
+	if ((idle & VIVS_HI_IDLE_STATE_PA) == 0)
+		seq_puts(m, "\t PA is not idle\n");
+	if ((idle & VIVS_HI_IDLE_STATE_SE) == 0)
+		seq_puts(m, "\t SE is not idle\n");
+	if ((idle & VIVS_HI_IDLE_STATE_RA) == 0)
+		seq_puts(m, "\t RA is not idle\n");
+	if ((idle & VIVS_HI_IDLE_STATE_TX) == 0)
+		seq_puts(m, "\t TX is not idle\n");
+	if ((idle & VIVS_HI_IDLE_STATE_VG) == 0)
+		seq_puts(m, "\t VG is not idle\n");
+	if ((idle & VIVS_HI_IDLE_STATE_IM) == 0)
+		seq_puts(m, "\t IM is not idle\n");
+	if ((idle & VIVS_HI_IDLE_STATE_FP) == 0)
+		seq_puts(m, "\t FP is not idle\n");
+	if ((idle & VIVS_HI_IDLE_STATE_TS) == 0)
+		seq_puts(m, "\t TS is not idle\n");
+	if (idle & VIVS_HI_IDLE_STATE_AXI_LP)
+		seq_puts(m, "\t AXI low power mode\n");
+
+	if (gpu->identity.features & chipFeatures_DEBUG_MODE) {
+		u32 read0 = gpu_read(gpu, VIVS_MC_DEBUG_READ0);
+		u32 read1 = gpu_read(gpu, VIVS_MC_DEBUG_READ1);
+		u32 write = gpu_read(gpu, VIVS_MC_DEBUG_WRITE);
+
+		seq_puts(m, "\tMC\n");
+		seq_printf(m, "\t read0: 0x%08x\n", read0);
+		seq_printf(m, "\t read1: 0x%08x\n", read1);
+		seq_printf(m, "\t write: 0x%08x\n", write);
+	}
+
+	seq_puts(m, "\tDMA ");
+
+	if (debug.address[0] == debug.address[1] &&
+	    debug.state[0] == debug.state[1]) {
+		seq_puts(m, "seems to be stuck\n");
+	} else if (debug.address[0] == debug.address[1]) {
+		seq_puts(m, "adress is constant\n");
+	} else {
+		seq_puts(m, "is runing\n");
+	}
+
+	seq_printf(m, "\t address 0: 0x%08x\n", debug.address[0]);
+	seq_printf(m, "\t address 1: 0x%08x\n", debug.address[1]);
+	seq_printf(m, "\t state 0: 0x%08x\n", debug.state[0]);
+	seq_printf(m, "\t state 1: 0x%08x\n", debug.state[1]);
+	seq_printf(m, "\t last fetch 64 bit word: 0x%08x 0x%08x\n",
+		   dma_lo, dma_hi);
+
+	ret = 0;
+
+	pm_runtime_mark_last_busy(gpu->dev);
+	pm_runtime_put_autosuspend(gpu->dev);
+
+	return ret;
+}
+#endif
+
+/*
+ * Power Management:
+ */
+static int enable_clk(struct etnaviv_gpu *gpu)
+{
+	if (gpu->clk_core)
+		clk_prepare_enable(gpu->clk_core);
+	if (gpu->clk_shader)
+		clk_prepare_enable(gpu->clk_shader);
+
+	return 0;
+}
+
+static int disable_clk(struct etnaviv_gpu *gpu)
+{
+	if (gpu->clk_core)
+		clk_disable_unprepare(gpu->clk_core);
+	if (gpu->clk_shader)
+		clk_disable_unprepare(gpu->clk_shader);
+
+	return 0;
+}
+
+static int enable_axi(struct etnaviv_gpu *gpu)
+{
+	if (gpu->clk_bus)
+		clk_prepare_enable(gpu->clk_bus);
+
+	return 0;
+}
+
+static int disable_axi(struct etnaviv_gpu *gpu)
+{
+	if (gpu->clk_bus)
+		clk_disable_unprepare(gpu->clk_bus);
+
+	return 0;
+}
+
+/*
+ * Hangcheck detection for locked gpu:
+ */
+static void recover_worker(struct work_struct *work)
+{
+	struct etnaviv_gpu *gpu = container_of(work, struct etnaviv_gpu,
+					       recover_work);
+	unsigned long flags;
+	unsigned int i;
+
+	dev_err(gpu->dev, "hangcheck recover!\n");
+
+	if (pm_runtime_get_sync(gpu->dev) < 0)
+		return;
+
+	mutex_lock(&gpu->lock);
+
+	/* Only catch the first event, or when manually re-armed */
+	if (etnaviv_dump_core) {
+		etnaviv_core_dump(gpu);
+		etnaviv_dump_core = false;
+	}
+
+	etnaviv_hw_reset(gpu);
+
+	/* complete all events, the GPU won't do it after the reset */
+	spin_lock_irqsave(&gpu->event_spinlock, flags);
+	for (i = 0; i < ARRAY_SIZE(gpu->event); i++) {
+		if (!gpu->event[i].used)
+			continue;
+		fence_signal(gpu->event[i].fence);
+		gpu->event[i].fence = NULL;
+		gpu->event[i].used = false;
+		complete(&gpu->event_free);
+		/*
+		 * Decrement the PM count for each stuck event. This is safe
+		 * even in atomic context as we use ASYNC RPM here.
+		 */
+		pm_runtime_put_autosuspend(gpu->dev);
+	}
+	spin_unlock_irqrestore(&gpu->event_spinlock, flags);
+	gpu->completed_fence = gpu->active_fence;
+
+	etnaviv_gpu_hw_init(gpu);
+	gpu->switch_context = true;
+
+	mutex_unlock(&gpu->lock);
+	pm_runtime_mark_last_busy(gpu->dev);
+	pm_runtime_put_autosuspend(gpu->dev);
+
+	/* Retire the buffer objects in a work */
+	etnaviv_queue_work(gpu->drm, &gpu->retire_work);
+}
+
+static void hangcheck_timer_reset(struct etnaviv_gpu *gpu)
+{
+	DBG("%s", dev_name(gpu->dev));
+	mod_timer(&gpu->hangcheck_timer,
+		  round_jiffies_up(jiffies + DRM_ETNAVIV_HANGCHECK_JIFFIES));
+}
+
+static void hangcheck_handler(unsigned long data)
+{
+	struct etnaviv_gpu *gpu = (struct etnaviv_gpu *)data;
+	u32 fence = gpu->completed_fence;
+	bool progress = false;
+
+	if (fence != gpu->hangcheck_fence) {
+		gpu->hangcheck_fence = fence;
+		progress = true;
+	}
+
+	if (!progress) {
+		u32 dma_addr = gpu_read(gpu, VIVS_FE_DMA_ADDRESS);
+		int change = dma_addr - gpu->hangcheck_dma_addr;
+
+		if (change < 0 || change > 16) {
+			gpu->hangcheck_dma_addr = dma_addr;
+			progress = true;
+		}
+	}
+
+	if (!progress && fence_after(gpu->active_fence, fence)) {
+		dev_err(gpu->dev, "hangcheck detected gpu lockup!\n");
+		dev_err(gpu->dev, "     completed fence: %u\n", fence);
+		dev_err(gpu->dev, "     active fence: %u\n",
+			gpu->active_fence);
+		etnaviv_queue_work(gpu->drm, &gpu->recover_work);
+	}
+
+	/* if still more pending work, reset the hangcheck timer: */
+	if (fence_after(gpu->active_fence, gpu->hangcheck_fence))
+		hangcheck_timer_reset(gpu);
+}
+
+static void hangcheck_disable(struct etnaviv_gpu *gpu)
+{
+	del_timer_sync(&gpu->hangcheck_timer);
+	cancel_work_sync(&gpu->recover_work);
+}
+
+/* fence object management */
+struct etnaviv_fence {
+	struct etnaviv_gpu *gpu;
+	struct fence base;
+};
+
+static inline struct etnaviv_fence *to_etnaviv_fence(struct fence *fence)
+{
+	return container_of(fence, struct etnaviv_fence, base);
+}
+
+static const char *etnaviv_fence_get_driver_name(struct fence *fence)
+{
+	return "etnaviv";
+}
+
+static const char *etnaviv_fence_get_timeline_name(struct fence *fence)
+{
+	struct etnaviv_fence *f = to_etnaviv_fence(fence);
+
+	return dev_name(f->gpu->dev);
+}
+
+static bool etnaviv_fence_enable_signaling(struct fence *fence)
+{
+	return true;
+}
+
+static bool etnaviv_fence_signaled(struct fence *fence)
+{
+	struct etnaviv_fence *f = to_etnaviv_fence(fence);
+
+	return fence_completed(f->gpu, f->base.seqno);
+}
+
+static void etnaviv_fence_release(struct fence *fence)
+{
+	struct etnaviv_fence *f = to_etnaviv_fence(fence);
+
+	kfree_rcu(f, base.rcu);
+}
+
+static const struct fence_ops etnaviv_fence_ops = {
+	.get_driver_name = etnaviv_fence_get_driver_name,
+	.get_timeline_name = etnaviv_fence_get_timeline_name,
+	.enable_signaling = etnaviv_fence_enable_signaling,
+	.signaled = etnaviv_fence_signaled,
+	.wait = fence_default_wait,
+	.release = etnaviv_fence_release,
+};
+
+static struct fence *etnaviv_gpu_fence_alloc(struct etnaviv_gpu *gpu)
+{
+	struct etnaviv_fence *f;
+
+	f = kzalloc(sizeof(*f), GFP_KERNEL);
+	if (!f)
+		return NULL;
+
+	f->gpu = gpu;
+
+	fence_init(&f->base, &etnaviv_fence_ops, &gpu->fence_spinlock,
+		   gpu->fence_context, ++gpu->next_fence);
+
+	return &f->base;
+}
+
+int etnaviv_gpu_fence_sync_obj(struct etnaviv_gem_object *etnaviv_obj,
+	unsigned int context, bool exclusive)
+{
+	struct reservation_object *robj = etnaviv_obj->resv;
+	struct reservation_object_list *fobj;
+	struct fence *fence;
+	int i, ret;
+
+	if (!exclusive) {
+		ret = reservation_object_reserve_shared(robj);
+		if (ret)
+			return ret;
+	}
+
+	/*
+	 * If we have any shared fences, then the exclusive fence
+	 * should be ignored as it will already have been signalled.
+	 */
+	fobj = reservation_object_get_list(robj);
+	if (!fobj || fobj->shared_count == 0) {
+		/* Wait on any existing exclusive fence which isn't our own */
+		fence = reservation_object_get_excl(robj);
+		if (fence && fence->context != context) {
+			ret = fence_wait(fence, true);
+			if (ret)
+				return ret;
+		}
+	}
+
+	if (!exclusive || !fobj)
+		return 0;
+
+	for (i = 0; i < fobj->shared_count; i++) {
+		fence = rcu_dereference_protected(fobj->shared[i],
+						reservation_object_held(robj));
+		if (fence->context != context) {
+			ret = fence_wait(fence, true);
+			if (ret)
+				return ret;
+		}
+	}
+
+	return 0;
+}
+
+/*
+ * event management:
+ */
+
+static unsigned int event_alloc(struct etnaviv_gpu *gpu)
+{
+	unsigned long ret, flags;
+	unsigned int i, event = ~0U;
+
+	ret = wait_for_completion_timeout(&gpu->event_free,
+					  msecs_to_jiffies(10 * 10000));
+	if (!ret)
+		dev_err(gpu->dev, "wait_for_completion_timeout failed");
+
+	spin_lock_irqsave(&gpu->event_spinlock, flags);
+
+	/* find first free event */
+	for (i = 0; i < ARRAY_SIZE(gpu->event); i++) {
+		if (gpu->event[i].used == false) {
+			gpu->event[i].used = true;
+			event = i;
+			break;
+		}
+	}
+
+	spin_unlock_irqrestore(&gpu->event_spinlock, flags);
+
+	return event;
+}
+
+static void event_free(struct etnaviv_gpu *gpu, unsigned int event)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&gpu->event_spinlock, flags);
+
+	if (gpu->event[event].used == false) {
+		dev_warn(gpu->dev, "event %u is already marked as free",
+			 event);
+		spin_unlock_irqrestore(&gpu->event_spinlock, flags);
+	} else {
+		gpu->event[event].used = false;
+		spin_unlock_irqrestore(&gpu->event_spinlock, flags);
+
+		complete(&gpu->event_free);
+	}
+}
+
+/*
+ * Cmdstream submission/retirement:
+ */
+
+struct etnaviv_cmdbuf *etnaviv_gpu_cmdbuf_new(struct etnaviv_gpu *gpu, u32 size,
+	size_t nr_bos)
+{
+	struct etnaviv_cmdbuf *cmdbuf;
+	size_t sz = size_vstruct(nr_bos, sizeof(cmdbuf->bo[0]),
+				 sizeof(*cmdbuf));
+
+	cmdbuf = kzalloc(sz, GFP_KERNEL);
+	if (!cmdbuf)
+		return NULL;
+
+	cmdbuf->vaddr = dma_alloc_writecombine(gpu->dev, size, &cmdbuf->paddr,
+					       GFP_KERNEL);
+	if (!cmdbuf->vaddr) {
+		kfree(cmdbuf);
+		return NULL;
+	}
+
+	cmdbuf->gpu = gpu;
+	cmdbuf->size = size;
+
+	return cmdbuf;
+}
+
+void etnaviv_gpu_cmdbuf_free(struct etnaviv_cmdbuf *cmdbuf)
+{
+	dma_free_writecombine(cmdbuf->gpu->dev, cmdbuf->size,
+			      cmdbuf->vaddr, cmdbuf->paddr);
+	kfree(cmdbuf);
+}
+
+static void retire_worker(struct work_struct *work)
+{
+	struct etnaviv_gpu *gpu = container_of(work, struct etnaviv_gpu,
+					       retire_work);
+	u32 fence = gpu->completed_fence;
+	struct etnaviv_cmdbuf *cmdbuf, *tmp;
+	unsigned int i;
+
+	mutex_lock(&gpu->lock);
+	list_for_each_entry_safe(cmdbuf, tmp, &gpu->active_cmd_list, node) {
+		if (!fence_is_signaled(cmdbuf->fence))
+			break;
+
+		list_del(&cmdbuf->node);
+		fence_put(cmdbuf->fence);
+
+		for (i = 0; i < cmdbuf->nr_bos; i++) {
+			struct etnaviv_gem_object *etnaviv_obj = cmdbuf->bo[i];
+
+			atomic_dec(&etnaviv_obj->gpu_active);
+			/* drop the refcount taken in etnaviv_gpu_submit */
+			etnaviv_gem_put_iova(gpu, &etnaviv_obj->base);
+		}
+
+		etnaviv_gpu_cmdbuf_free(cmdbuf);
+	}
+
+	gpu->retired_fence = fence;
+
+	mutex_unlock(&gpu->lock);
+
+	wake_up_all(&gpu->fence_event);
+}
+
+int etnaviv_gpu_wait_fence_interruptible(struct etnaviv_gpu *gpu,
+	u32 fence, struct timespec *timeout)
+{
+	int ret;
+
+	if (fence_after(fence, gpu->next_fence)) {
+		DRM_ERROR("waiting on invalid fence: %u (of %u)\n",
+				fence, gpu->next_fence);
+		return -EINVAL;
+	}
+
+	if (!timeout) {
+		/* No timeout was requested: just test for completion */
+		ret = fence_completed(gpu, fence) ? 0 : -EBUSY;
+	} else {
+		unsigned long remaining = etnaviv_timeout_to_jiffies(timeout);
+
+		ret = wait_event_interruptible_timeout(gpu->fence_event,
+						fence_completed(gpu, fence),
+						remaining);
+		if (ret == 0) {
+			DBG("timeout waiting for fence: %u (retired: %u completed: %u)",
+				fence, gpu->retired_fence,
+				gpu->completed_fence);
+			ret = -ETIMEDOUT;
+		} else if (ret != -ERESTARTSYS) {
+			ret = 0;
+		}
+	}
+
+	return ret;
+}
+
+/*
+ * Wait for an object to become inactive.  This, on it's own, is not race
+ * free: the object is moved by the retire worker off the active list, and
+ * then the iova is put.  Moreover, the object could be re-submitted just
+ * after we notice that it's become inactive.
+ *
+ * Although the retirement happens under the gpu lock, we don't want to hold
+ * that lock in this function while waiting.
+ */
+int etnaviv_gpu_wait_obj_inactive(struct etnaviv_gpu *gpu,
+	struct etnaviv_gem_object *etnaviv_obj, struct timespec *timeout)
+{
+	unsigned long remaining;
+	long ret;
+
+	if (!timeout)
+		return !is_active(etnaviv_obj) ? 0 : -EBUSY;
+
+	remaining = etnaviv_timeout_to_jiffies(timeout);
+
+	ret = wait_event_interruptible_timeout(gpu->fence_event,
+					       !is_active(etnaviv_obj),
+					       remaining);
+	if (ret > 0) {
+		struct etnaviv_drm_private *priv = gpu->drm->dev_private;
+
+		/* Synchronise with the retire worker */
+		flush_workqueue(priv->wq);
+		return 0;
+	} else if (ret == -ERESTARTSYS) {
+		return -ERESTARTSYS;
+	} else {
+		return -ETIMEDOUT;
+	}
+}
+
+int etnaviv_gpu_pm_get_sync(struct etnaviv_gpu *gpu)
+{
+	return pm_runtime_get_sync(gpu->dev);
+}
+
+void etnaviv_gpu_pm_put(struct etnaviv_gpu *gpu)
+{
+	pm_runtime_mark_last_busy(gpu->dev);
+	pm_runtime_put_autosuspend(gpu->dev);
+}
+
+/* add bo's to gpu's ring, and kick gpu: */
+int etnaviv_gpu_submit(struct etnaviv_gpu *gpu,
+	struct etnaviv_gem_submit *submit, struct etnaviv_cmdbuf *cmdbuf)
+{
+	struct fence *fence;
+	unsigned int event, i;
+	int ret;
+
+	ret = etnaviv_gpu_pm_get_sync(gpu);
+	if (ret < 0)
+		return ret;
+
+	mutex_lock(&gpu->lock);
+
+	/*
+	 * TODO
+	 *
+	 * - flush
+	 * - data endian
+	 * - prefetch
+	 *
+	 */
+
+	event = event_alloc(gpu);
+	if (unlikely(event == ~0U)) {
+		DRM_ERROR("no free event\n");
+		ret = -EBUSY;
+		goto out_unlock;
+	}
+
+	fence = etnaviv_gpu_fence_alloc(gpu);
+	if (!fence) {
+		event_free(gpu, event);
+		ret = -ENOMEM;
+		goto out_unlock;
+	}
+
+	gpu->event[event].fence = fence;
+	submit->fence = fence->seqno;
+	gpu->active_fence = submit->fence;
+
+	if (gpu->lastctx != cmdbuf->ctx) {
+		gpu->mmu->need_flush = true;
+		gpu->switch_context = true;
+		gpu->lastctx = cmdbuf->ctx;
+	}
+
+	etnaviv_buffer_queue(gpu, event, cmdbuf);
+
+	cmdbuf->fence = fence;
+	list_add_tail(&cmdbuf->node, &gpu->active_cmd_list);
+
+	/* We're committed to adding this command buffer, hold a PM reference */
+	pm_runtime_get_noresume(gpu->dev);
+
+	for (i = 0; i < submit->nr_bos; i++) {
+		struct etnaviv_gem_object *etnaviv_obj = submit->bos[i].obj;
+		u32 iova;
+
+		/* Each cmdbuf takes a refcount on the iova */
+		etnaviv_gem_get_iova(gpu, &etnaviv_obj->base, &iova);
+		cmdbuf->bo[i] = etnaviv_obj;
+		atomic_inc(&etnaviv_obj->gpu_active);
+
+		if (submit->bos[i].flags & ETNA_SUBMIT_BO_WRITE)
+			reservation_object_add_excl_fence(etnaviv_obj->resv,
+							  fence);
+		else
+			reservation_object_add_shared_fence(etnaviv_obj->resv,
+							    fence);
+	}
+	cmdbuf->nr_bos = submit->nr_bos;
+	hangcheck_timer_reset(gpu);
+	ret = 0;
+
+out_unlock:
+	mutex_unlock(&gpu->lock);
+
+	etnaviv_gpu_pm_put(gpu);
+
+	return ret;
+}
+
+/*
+ * Init/Cleanup:
+ */
+static irqreturn_t irq_handler(int irq, void *data)
+{
+	struct etnaviv_gpu *gpu = data;
+	irqreturn_t ret = IRQ_NONE;
+
+	u32 intr = gpu_read(gpu, VIVS_HI_INTR_ACKNOWLEDGE);
+
+	if (intr != 0) {
+		int event;
+
+		pm_runtime_mark_last_busy(gpu->dev);
+
+		dev_dbg(gpu->dev, "intr 0x%08x\n", intr);
+
+		if (intr & VIVS_HI_INTR_ACKNOWLEDGE_AXI_BUS_ERROR) {
+			dev_err(gpu->dev, "AXI bus error\n");
+			intr &= ~VIVS_HI_INTR_ACKNOWLEDGE_AXI_BUS_ERROR;
+		}
+
+		while ((event = ffs(intr)) != 0) {
+			struct fence *fence;
+
+			event -= 1;
+
+			intr &= ~(1 << event);
+
+			dev_dbg(gpu->dev, "event %u\n", event);
+
+			fence = gpu->event[event].fence;
+			gpu->event[event].fence = NULL;
+			fence_signal(fence);
+
+			/*
+			 * Events can be processed out of order.  Eg,
+			 * - allocate and queue event 0
+			 * - allocate event 1
+			 * - event 0 completes, we process it
+			 * - allocate and queue event 0
+			 * - event 1 and event 0 complete
+			 * we can end up processing event 0 first, then 1.
+			 */
+			if (fence_after(fence->seqno, gpu->completed_fence))
+				gpu->completed_fence = fence->seqno;
+
+			event_free(gpu, event);
+
+			/*
+			 * We need to balance the runtime PM count caused by
+			 * each submission.  Upon submission, we increment
+			 * the runtime PM counter, and allocate one event.
+			 * So here, we put the runtime PM count for each
+			 * completed event.
+			 */
+			pm_runtime_put_autosuspend(gpu->dev);
+		}
+
+		/* Retire the buffer objects in a work */
+		etnaviv_queue_work(gpu->drm, &gpu->retire_work);
+
+		ret = IRQ_HANDLED;
+	}
+
+	return ret;
+}
+
+static int etnaviv_gpu_clk_enable(struct etnaviv_gpu *gpu)
+{
+	int ret;
+
+	ret = enable_clk(gpu);
+	if (ret)
+		return ret;
+
+	ret = enable_axi(gpu);
+	if (ret) {
+		disable_clk(gpu);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int etnaviv_gpu_clk_disable(struct etnaviv_gpu *gpu)
+{
+	int ret;
+
+	ret = disable_axi(gpu);
+	if (ret)
+		return ret;
+
+	ret = disable_clk(gpu);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static int etnaviv_gpu_hw_suspend(struct etnaviv_gpu *gpu)
+{
+	if (gpu->buffer) {
+		unsigned long timeout;
+
+		/* Replace the last WAIT with END */
+		etnaviv_buffer_end(gpu);
+
+		/*
+		 * We know that only the FE is busy here, this should
+		 * happen quickly (as the WAIT is only 200 cycles).  If
+		 * we fail, just warn and continue.
+		 */
+		timeout = jiffies + msecs_to_jiffies(100);
+		do {
+			u32 idle = gpu_read(gpu, VIVS_HI_IDLE_STATE);
+
+			if ((idle & gpu->idle_mask) == gpu->idle_mask)
+				break;
+
+			if (time_is_before_jiffies(timeout)) {
+				dev_warn(gpu->dev,
+					 "timed out waiting for idle: idle=0x%x\n",
+					 idle);
+				break;
+			}
+
+			udelay(5);
+		} while (1);
+	}
+
+	return etnaviv_gpu_clk_disable(gpu);
+}
+
+#ifdef CONFIG_PM
+static int etnaviv_gpu_hw_resume(struct etnaviv_gpu *gpu)
+{
+	u32 clock;
+	int ret;
+
+	ret = mutex_lock_killable(&gpu->lock);
+	if (ret)
+		return ret;
+
+	clock = VIVS_HI_CLOCK_CONTROL_DISABLE_DEBUG_REGISTERS |
+		VIVS_HI_CLOCK_CONTROL_FSCALE_VAL(0x40);
+
+	etnaviv_gpu_load_clock(gpu, clock);
+	etnaviv_gpu_hw_init(gpu);
+
+	gpu->switch_context = true;
+
+	mutex_unlock(&gpu->lock);
+
+	return 0;
+}
+#endif
+
+static int etnaviv_gpu_bind(struct device *dev, struct device *master,
+	void *data)
+{
+	struct drm_device *drm = data;
+	struct etnaviv_drm_private *priv = drm->dev_private;
+	struct etnaviv_gpu *gpu = dev_get_drvdata(dev);
+	int ret;
+
+#ifdef CONFIG_PM
+	ret = pm_runtime_get_sync(gpu->dev);
+#else
+	ret = etnaviv_gpu_clk_enable(gpu);
+#endif
+	if (ret < 0)
+		return ret;
+
+	gpu->drm = drm;
+	gpu->fence_context = fence_context_alloc(1);
+	spin_lock_init(&gpu->fence_spinlock);
+
+	INIT_LIST_HEAD(&gpu->active_cmd_list);
+	INIT_WORK(&gpu->retire_work, retire_worker);
+	INIT_WORK(&gpu->recover_work, recover_worker);
+	init_waitqueue_head(&gpu->fence_event);
+
+	setup_timer(&gpu->hangcheck_timer, hangcheck_handler,
+			(unsigned long)gpu);
+
+	priv->gpu[priv->num_gpus++] = gpu;
+
+	pm_runtime_mark_last_busy(gpu->dev);
+	pm_runtime_put_autosuspend(gpu->dev);
+
+	return 0;
+}
+
+static void etnaviv_gpu_unbind(struct device *dev, struct device *master,
+	void *data)
+{
+	struct etnaviv_gpu *gpu = dev_get_drvdata(dev);
+
+	DBG("%s", dev_name(gpu->dev));
+
+	hangcheck_disable(gpu);
+
+#ifdef CONFIG_PM
+	pm_runtime_get_sync(gpu->dev);
+	pm_runtime_put_sync_suspend(gpu->dev);
+#else
+	etnaviv_gpu_hw_suspend(gpu);
+#endif
+
+	if (gpu->buffer) {
+		etnaviv_gpu_cmdbuf_free(gpu->buffer);
+		gpu->buffer = NULL;
+	}
+
+	if (gpu->mmu) {
+		etnaviv_iommu_destroy(gpu->mmu);
+		gpu->mmu = NULL;
+	}
+
+	gpu->drm = NULL;
+}
+
+static const struct component_ops gpu_ops = {
+	.bind = etnaviv_gpu_bind,
+	.unbind = etnaviv_gpu_unbind,
+};
+
+static const struct of_device_id etnaviv_gpu_match[] = {
+	{
+		.compatible = "vivante,gc"
+	},
+	{ /* sentinel */ }
+};
+
+static int etnaviv_gpu_platform_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct etnaviv_gpu *gpu;
+	int err = 0;
+
+	gpu = devm_kzalloc(dev, sizeof(*gpu), GFP_KERNEL);
+	if (!gpu)
+		return -ENOMEM;
+
+	gpu->dev = &pdev->dev;
+	mutex_init(&gpu->lock);
+
+	/*
+	 * Set the GPU base address to the start of physical memory.  This
+	 * ensures that if we have up to 2GB, the v1 MMU can address the
+	 * highest memory.  This is important as command buffers may be
+	 * allocated outside of this limit.
+	 */
+	gpu->memory_base = PHYS_OFFSET;
+
+	/* Map registers: */
+	gpu->mmio = etnaviv_ioremap(pdev, NULL, dev_name(gpu->dev));
+	if (IS_ERR(gpu->mmio))
+		return PTR_ERR(gpu->mmio);
+
+	/* Get Interrupt: */
+	gpu->irq = platform_get_irq(pdev, 0);
+	if (gpu->irq < 0) {
+		err = gpu->irq;
+		dev_err(dev, "failed to get irq: %d\n", err);
+		goto fail;
+	}
+
+	err = devm_request_irq(&pdev->dev, gpu->irq, irq_handler, 0,
+			       dev_name(gpu->dev), gpu);
+	if (err) {
+		dev_err(dev, "failed to request IRQ%u: %d\n", gpu->irq, err);
+		goto fail;
+	}
+
+	/* Get Clocks: */
+	gpu->clk_bus = devm_clk_get(&pdev->dev, "bus");
+	DBG("clk_bus: %p", gpu->clk_bus);
+	if (IS_ERR(gpu->clk_bus))
+		gpu->clk_bus = NULL;
+
+	gpu->clk_core = devm_clk_get(&pdev->dev, "core");
+	DBG("clk_core: %p", gpu->clk_core);
+	if (IS_ERR(gpu->clk_core))
+		gpu->clk_core = NULL;
+
+	gpu->clk_shader = devm_clk_get(&pdev->dev, "shader");
+	DBG("clk_shader: %p", gpu->clk_shader);
+	if (IS_ERR(gpu->clk_shader))
+		gpu->clk_shader = NULL;
+
+	/* TODO: figure out max mapped size */
+	dev_set_drvdata(dev, gpu);
+
+	/*
+	 * We treat the device as initially suspended.  The runtime PM
+	 * autosuspend delay is rather arbitary: no measurements have
+	 * yet been performed to determine an appropriate value.
+	 */
+	pm_runtime_use_autosuspend(gpu->dev);
+	pm_runtime_set_autosuspend_delay(gpu->dev, 200);
+	pm_runtime_enable(gpu->dev);
+
+	err = component_add(&pdev->dev, &gpu_ops);
+	if (err < 0) {
+		dev_err(&pdev->dev, "failed to register component: %d\n", err);
+		goto fail;
+	}
+
+	return 0;
+
+fail:
+	return err;
+}
+
+static int etnaviv_gpu_platform_remove(struct platform_device *pdev)
+{
+	component_del(&pdev->dev, &gpu_ops);
+	pm_runtime_disable(&pdev->dev);
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int etnaviv_gpu_rpm_suspend(struct device *dev)
+{
+	struct etnaviv_gpu *gpu = dev_get_drvdata(dev);
+	u32 idle, mask;
+
+	/* If we have outstanding fences, we're not idle */
+	if (gpu->completed_fence != gpu->active_fence)
+		return -EBUSY;
+
+	/* Check whether the hardware (except FE) is idle */
+	mask = gpu->idle_mask & ~VIVS_HI_IDLE_STATE_FE;
+	idle = gpu_read(gpu, VIVS_HI_IDLE_STATE) & mask;
+	if (idle != mask)
+		return -EBUSY;
+
+	return etnaviv_gpu_hw_suspend(gpu);
+}
+
+static int etnaviv_gpu_rpm_resume(struct device *dev)
+{
+	struct etnaviv_gpu *gpu = dev_get_drvdata(dev);
+	int ret;
+
+	ret = etnaviv_gpu_clk_enable(gpu);
+	if (ret)
+		return ret;
+
+	/* Re-initialise the basic hardware state */
+	if (gpu->drm && gpu->buffer) {
+		ret = etnaviv_gpu_hw_resume(gpu);
+		if (ret) {
+			etnaviv_gpu_clk_disable(gpu);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+#endif
+
+static const struct dev_pm_ops etnaviv_gpu_pm_ops = {
+	SET_RUNTIME_PM_OPS(etnaviv_gpu_rpm_suspend, etnaviv_gpu_rpm_resume,
+			   NULL)
+};
+
+struct platform_driver etnaviv_gpu_driver = {
+	.driver = {
+		.name = "etnaviv-gpu",
+		.owner = THIS_MODULE,
+		.pm = &etnaviv_gpu_pm_ops,
+		.of_match_table = etnaviv_gpu_match,
+	},
+	.probe = etnaviv_gpu_platform_probe,
+	.remove = etnaviv_gpu_platform_remove,
+	.id_table = gpu_ids,
+};
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gpu.h b/drivers/gpu/drm/etnaviv/etnaviv_gpu.h
new file mode 100644
index 000000000000..c75d50359ab0
--- /dev/null
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.h
@@ -0,0 +1,209 @@
+/*
+ * Copyright (C) 2015 Etnaviv Project
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __ETNAVIV_GPU_H__
+#define __ETNAVIV_GPU_H__
+
+#include <linux/clk.h>
+#include <linux/regulator/consumer.h>
+
+#include "etnaviv_drv.h"
+
+struct etnaviv_gem_submit;
+
+struct etnaviv_chip_identity {
+	/* Chip model. */
+	u32 model;
+
+	/* Revision value.*/
+	u32 revision;
+
+	/* Supported feature fields. */
+	u32 features;
+
+	/* Supported minor feature fields. */
+	u32 minor_features0;
+
+	/* Supported minor feature 1 fields. */
+	u32 minor_features1;
+
+	/* Supported minor feature 2 fields. */
+	u32 minor_features2;
+
+	/* Supported minor feature 3 fields. */
+	u32 minor_features3;
+
+	/* Number of streams supported. */
+	u32 stream_count;
+
+	/* Total number of temporary registers per thread. */
+	u32 register_max;
+
+	/* Maximum number of threads. */
+	u32 thread_count;
+
+	/* Number of shader cores. */
+	u32 shader_core_count;
+
+	/* Size of the vertex cache. */
+	u32 vertex_cache_size;
+
+	/* Number of entries in the vertex output buffer. */
+	u32 vertex_output_buffer_size;
+
+	/* Number of pixel pipes. */
+	u32 pixel_pipes;
+
+	/* Number of instructions. */
+	u32 instruction_count;
+
+	/* Number of constants. */
+	u32 num_constants;
+
+	/* Buffer size */
+	u32 buffer_size;
+};
+
+struct etnaviv_event {
+	bool used;
+	struct fence *fence;
+};
+
+struct etnaviv_cmdbuf;
+
+struct etnaviv_gpu {
+	struct drm_device *drm;
+	struct device *dev;
+	struct mutex lock;
+	struct etnaviv_chip_identity identity;
+	struct etnaviv_file_private *lastctx;
+	bool switch_context;
+
+	/* 'ring'-buffer: */
+	struct etnaviv_cmdbuf *buffer;
+
+	/* bus base address of memory  */
+	u32 memory_base;
+
+	/* event management: */
+	struct etnaviv_event event[30];
+	struct completion event_free;
+	spinlock_t event_spinlock;
+
+	/* list of currently in-flight command buffers */
+	struct list_head active_cmd_list;
+
+	u32 idle_mask;
+
+	/* Fencing support */
+	u32 next_fence;
+	u32 active_fence;
+	u32 completed_fence;
+	u32 retired_fence;
+	wait_queue_head_t fence_event;
+	unsigned int fence_context;
+	spinlock_t fence_spinlock;
+
+	/* worker for handling active-list retiring: */
+	struct work_struct retire_work;
+
+	void __iomem *mmio;
+	int irq;
+
+	struct etnaviv_iommu *mmu;
+
+	/* Power Control: */
+	struct clk *clk_bus;
+	struct clk *clk_core;
+	struct clk *clk_shader;
+
+	/* Hang Detction: */
+#define DRM_ETNAVIV_HANGCHECK_PERIOD 500 /* in ms */
+#define DRM_ETNAVIV_HANGCHECK_JIFFIES msecs_to_jiffies(DRM_ETNAVIV_HANGCHECK_PERIOD)
+	struct timer_list hangcheck_timer;
+	u32 hangcheck_fence;
+	u32 hangcheck_dma_addr;
+	struct work_struct recover_work;
+};
+
+struct etnaviv_cmdbuf {
+	/* device this cmdbuf is allocated for */
+	struct etnaviv_gpu *gpu;
+	/* user context key, must be unique between all active users */
+	struct etnaviv_file_private *ctx;
+	/* cmdbuf properties */
+	void *vaddr;
+	dma_addr_t paddr;
+	u32 size;
+	u32 user_size;
+	/* fence after which this buffer is to be disposed */
+	struct fence *fence;
+	/* target exec state */
+	u32 exec_state;
+	/* per GPU in-flight list */
+	struct list_head node;
+	/* BOs attached to this command buffer */
+	unsigned int nr_bos;
+	struct etnaviv_gem_object *bo[0];
+};
+
+static inline void gpu_write(struct etnaviv_gpu *gpu, u32 reg, u32 data)
+{
+	etnaviv_writel(data, gpu->mmio + reg);
+}
+
+static inline u32 gpu_read(struct etnaviv_gpu *gpu, u32 reg)
+{
+	return etnaviv_readl(gpu->mmio + reg);
+}
+
+static inline bool fence_completed(struct etnaviv_gpu *gpu, u32 fence)
+{
+	return fence_after_eq(gpu->completed_fence, fence);
+}
+
+static inline bool fence_retired(struct etnaviv_gpu *gpu, u32 fence)
+{
+	return fence_after_eq(gpu->retired_fence, fence);
+}
+
+int etnaviv_gpu_get_param(struct etnaviv_gpu *gpu, u32 param, u64 *value);
+
+int etnaviv_gpu_init(struct etnaviv_gpu *gpu);
+
+#ifdef CONFIG_DEBUG_FS
+int etnaviv_gpu_debugfs(struct etnaviv_gpu *gpu, struct seq_file *m);
+#endif
+
+int etnaviv_gpu_fence_sync_obj(struct etnaviv_gem_object *etnaviv_obj,
+	unsigned int context, bool exclusive);
+
+void etnaviv_gpu_retire(struct etnaviv_gpu *gpu);
+int etnaviv_gpu_wait_fence_interruptible(struct etnaviv_gpu *gpu,
+	u32 fence, struct timespec *timeout);
+int etnaviv_gpu_wait_obj_inactive(struct etnaviv_gpu *gpu,
+	struct etnaviv_gem_object *etnaviv_obj, struct timespec *timeout);
+int etnaviv_gpu_submit(struct etnaviv_gpu *gpu,
+	struct etnaviv_gem_submit *submit, struct etnaviv_cmdbuf *cmdbuf);
+struct etnaviv_cmdbuf *etnaviv_gpu_cmdbuf_new(struct etnaviv_gpu *gpu,
+					      u32 size, size_t nr_bos);
+void etnaviv_gpu_cmdbuf_free(struct etnaviv_cmdbuf *cmdbuf);
+int etnaviv_gpu_pm_get_sync(struct etnaviv_gpu *gpu);
+void etnaviv_gpu_pm_put(struct etnaviv_gpu *gpu);
+
+extern struct platform_driver etnaviv_gpu_driver;
+
+#endif /* __ETNAVIV_GPU_H__ */
-- 
2.6.2

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