staging: gma500: Intel GMA500 staging driver

This is an initial staging driver for the GMA500. It's been stripped out
of the PVR drivers and crunched together from various bits of code and
different kernels.

Currently it's unaccelerated but still pretty snappy even compositing with
the frame buffer X server.

Lots of work is needed to rework the ttm and bo interfaces from being
ripped out and then 2D acceleration wants putting back for framebuffer and
somehow eventually via DRM.

There is no support for the parts without open source userspace (video
accelerators, 3D) as per kernel policy.
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/Kconfig

@@ -179,5 +179,7 @@ source "drivers/staging/cptm1217/Kconfig"
 
 source "drivers/staging/ste_rmi4/Kconfig"
 
+source "drivers/staging/gma500/Kconfig"
+
 endif # !STAGING_EXCLUDE_BUILD
 endif # STAGING

drivers/staging/Makefile

@@ -61,12 +61,13 @@ obj-$(CONFIG_SOLO6X10)		+= solo6x10/
 obj-$(CONFIG_TIDSPBRIDGE)	+= tidspbridge/
 obj-$(CONFIG_ACPI_QUICKSTART)	+= quickstart/
 obj-$(CONFIG_WESTBRIDGE_ASTORIA)	+= westbridge/astoria/
-obj-$(CONFIG_SBE_2T3E3)	+= sbe-2t3e3/
+obj-$(CONFIG_SBE_2T3E3)		+= sbe-2t3e3/
 obj-$(CONFIG_ATH6K_LEGACY)	+= ath6kl/
 obj-$(CONFIG_USB_ENESTORAGE)	+= keucr/
-obj-$(CONFIG_BCM_WIMAX)	+= bcm/
+obj-$(CONFIG_BCM_WIMAX)		+= bcm/
 obj-$(CONFIG_FT1000)		+= ft1000/
-obj-$(CONFIG_SND_INTEL_SST)		+= intel_sst/
-obj-$(CONFIG_SPEAKUP)	+= speakup/
+obj-$(CONFIG_SND_INTEL_SST)	+= intel_sst/
+obj-$(CONFIG_SPEAKUP)		+= speakup/
 obj-$(CONFIG_TOUCHSCREEN_CLEARPAD_TM1217)	+= cptm1217/
 obj-$(CONFIG_TOUCHSCREEN_SYNAPTICS_I2C_RMI4)	+= ste_rmi4/
+obj-$(CONFIG_DRM_PSB)		+= gma500/

drivers/staging/gma500/Kconfig

+config DRM_PSB
+	tristate "Intel GMA500 KMS Framebuffer"
+	depends on DRM && PCI
+	select FB_CFB_COPYAREA
+        select FB_CFB_FILLRECT
+        select FB_CFB_IMAGEBLIT
+        select DRM_KMS_HELPER
+        select DRM_TTM
+	help
+	  Say yes for an experimental KMS framebuffer driver for the
+	  Intel GMA500 ('Poulsbo') graphics support.
+

drivers/staging/gma500/Makefile

+#
+#	KMS driver for the GMA500
+#
+ccflags-y += -Iinclude/drm
+
+psb_gfx-y += psb_bl.o \
+	  psb_drv.o \
+	  psb_fb.o \
+	  psb_gtt.o \
+	  psb_intel_bios.o \
+	  psb_intel_opregion.o \
+	  psb_intel_display.o \
+	  psb_intel_i2c.o \
+	  psb_intel_lvds.o \
+	  psb_intel_modes.o \
+	  psb_intel_sdvo.o \
+	  psb_reset.o \
+	  psb_sgx.o \
+	  psb_pvr_glue.o \
+	  psb_buffer.o \
+	  psb_fence.o \
+	  psb_mmu.o \
+	  psb_ttm_glue.o \
+	  psb_ttm_fence.o \
+	  psb_ttm_fence_user.o \
+	  psb_ttm_placement_user.o \
+	  psb_powermgmt.o \
+	  psb_irq.o
+
+obj-$(CONFIG_DRM_PSB) += psb_gfx.o

drivers/staging/gma500/TODO

+-	Test on more platforms
+-	Clean up the various chunks of unused code
+-	Sort out the power management side. Not important for Poulsbo but
+	matters for Moorestown
+-	Add Moorestown support (single pipe, no BIOS, no stolen memory,
+				some other differences)
+-	Sort out the bo and ttm code to support userframe buffers and DRM
+	interfaces rather than just faking it enough for a framebuffer
+-	Add 2D acceleration via console and DRM
+
+As per kernel policy and the in the interest of the safety of various
+kittens there is no support or plans to add hooks for the closed user space
+stuff.
+
+
+Why bother ?
+- Proper display configuration
+- Can be made to work on Moorestown where VESA won't
+- Works on systems where the VESA BIOS is bust or the tables are broken
+  without hacks
+- 2D acceleration
+
+Currently tested on
++	Dell Mini 10 100x600
+
+

drivers/staging/gma500/psb_bl.c

+/*
+ *  psb backlight using HAL
+ *
+ * Copyright (c) 2009, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Authors: Eric Knopp
+ *
+ */
+
+#include <linux/backlight.h>
+#include <linux/version.h>
+#include "psb_drv.h"
+#include "psb_intel_reg.h"
+#include "psb_intel_drv.h"
+#include "psb_intel_bios.h"
+#include "psb_powermgmt.h"
+
+#define MRST_BLC_MAX_PWM_REG_FREQ	    0xFFFF
+#define BLC_PWM_PRECISION_FACTOR 100	/* 10000000 */
+#define BLC_PWM_FREQ_CALC_CONSTANT 32
+#define MHz 1000000
+#define BRIGHTNESS_MIN_LEVEL 1
+#define BRIGHTNESS_MAX_LEVEL 100
+#define BRIGHTNESS_MASK	0xFF
+#define BLC_POLARITY_NORMAL 0
+#define BLC_POLARITY_INVERSE 1
+#define BLC_ADJUSTMENT_MAX 100
+
+#define PSB_BLC_PWM_PRECISION_FACTOR    10
+#define PSB_BLC_MAX_PWM_REG_FREQ        0xFFFE
+#define PSB_BLC_MIN_PWM_REG_FREQ        0x2
+
+#define PSB_BACKLIGHT_PWM_POLARITY_BIT_CLEAR (0xFFFE)
+#define PSB_BACKLIGHT_PWM_CTL_SHIFT	(16)
+
+static int psb_brightness;
+static struct backlight_device *psb_backlight_device;
+static u8 blc_brightnesscmd;
+static u8 blc_pol;
+static u8 blc_type;
+
+int psb_set_brightness(struct backlight_device *bd)
+{
+	struct drm_device *dev = bl_get_data(psb_backlight_device);
+	int level = bd->props.brightness;
+
+	DRM_DEBUG_DRIVER("backlight level set to %d\n", level);
+
+	/* Perform value bounds checking */
+	if (level < BRIGHTNESS_MIN_LEVEL)
+		level = BRIGHTNESS_MIN_LEVEL;
+
+	psb_intel_lvds_set_brightness(dev, level);
+	psb_brightness = level;
+	return 0;
+}
+
+int psb_get_brightness(struct backlight_device *bd)
+{
+	DRM_DEBUG_DRIVER("brightness = 0x%x\n", psb_brightness);
+
+	/* return locally cached var instead of HW read (due to DPST etc.) */
+	return psb_brightness;
+}
+
+static const struct backlight_ops psb_ops = {
+	.get_brightness = psb_get_brightness,
+	.update_status  = psb_set_brightness,
+};
+
+static int device_backlight_init(struct drm_device *dev)
+{
+	unsigned long CoreClock;
+	/* u32 bl_max_freq; */
+	/* unsigned long value; */
+	u16 bl_max_freq;
+	uint32_t value;
+	uint32_t blc_pwm_precision_factor;
+	struct drm_psb_private *dev_priv = dev->dev_private;
+
+	/* get bl_max_freq and pol from dev_priv*/
+	if (!dev_priv->lvds_bl) {
+		DRM_ERROR("Has no valid LVDS backlight info\n");
+		return 1;
+	}
+	bl_max_freq = dev_priv->lvds_bl->freq;
+	blc_pol = dev_priv->lvds_bl->pol;
+	blc_pwm_precision_factor = PSB_BLC_PWM_PRECISION_FACTOR;
+	blc_brightnesscmd = dev_priv->lvds_bl->brightnesscmd;
+	blc_type = dev_priv->lvds_bl->type;
+
+	CoreClock = dev_priv->core_freq;
+
+	value = (CoreClock * MHz) / BLC_PWM_FREQ_CALC_CONSTANT;
+	value *= blc_pwm_precision_factor;
+	value /= bl_max_freq;
+	value /= blc_pwm_precision_factor;
+
+	if (ospm_power_using_hw_begin(OSPM_DISPLAY_ISLAND,
+						OSPM_UHB_ONLY_IF_ON)) {
+		/* Check: may be MFLD only */
+		if (
+		 value > (unsigned long long)PSB_BLC_MAX_PWM_REG_FREQ ||
+		 value < (unsigned long long)PSB_BLC_MIN_PWM_REG_FREQ)
+			return 2;
+		else {
+			value &= PSB_BACKLIGHT_PWM_POLARITY_BIT_CLEAR;
+			REG_WRITE(BLC_PWM_CTL,
+				(value << PSB_BACKLIGHT_PWM_CTL_SHIFT) |
+				(value));
+		}
+		ospm_power_using_hw_end(OSPM_DISPLAY_ISLAND);
+	}
+	return 0;
+}
+
+int psb_backlight_init(struct drm_device *dev)
+{
+#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
+	int ret = 0;
+
+	struct backlight_properties props;
+	memset(&props, 0, sizeof(struct backlight_properties));
+	props.max_brightness = BRIGHTNESS_MAX_LEVEL;
+
+	psb_backlight_device = backlight_device_register("psb-bl", NULL,
+						(void *)dev, &psb_ops, &props);
+	if (IS_ERR(psb_backlight_device))
+		return PTR_ERR(psb_backlight_device);
+
+	ret = device_backlight_init(dev);
+	if (ret < 0)
+		return ret;
+
+	psb_backlight_device->props.brightness = BRIGHTNESS_MAX_LEVEL;
+	psb_backlight_device->props.max_brightness = BRIGHTNESS_MAX_LEVEL;
+	backlight_update_status(psb_backlight_device);
+#endif
+	return 0;
+}
+
+void psb_backlight_exit(void)
+{
+#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
+	psb_backlight_device->props.brightness = 0;
+	backlight_update_status(psb_backlight_device);
+	backlight_device_unregister(psb_backlight_device);
+#endif
+}
+
+struct backlight_device *psb_get_backlight_device(void)
+{
+	return psb_backlight_device;
+}

drivers/staging/gma500/psb_fb.h

+/*
+ * Copyright (c) 2008, Intel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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, write to the Free Software Foundation, Inc., 
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Authors:
+ *      Eric Anholt <eric@anholt.net>
+ *
+ */
+
+#ifndef _PSB_FB_H_
+#define _PSB_FB_H_
+
+#include <linux/version.h>
+#include <drm/drmP.h>
+#include <drm/drm_fb_helper.h>
+
+#include "psb_drv.h"
+
+/*IMG Headers*/
+/*#include "servicesint.h"*/
+
+struct psb_framebuffer {
+	struct drm_framebuffer base;
+	struct address_space *addr_space;
+	struct ttm_buffer_object *bo;
+	struct fb_info * fbdev;
+	/* struct ttm_bo_kmap_obj kmap; */
+	void *pvrBO;	/* FIXME: sort this out */
+	void * hKernelMemInfo;
+	uint32_t size;
+	uint32_t offset;
+};
+
+struct psb_fbdev {
+	struct drm_fb_helper psb_fb_helper;
+	struct psb_framebuffer * pfb;
+};
+
+
+#define to_psb_fb(x) container_of(x, struct psb_framebuffer, base)
+
+
+extern int psb_intel_connector_clones(struct drm_device *dev, int type_mask);
+
+
+#endif
+

drivers/staging/gma500/psb_fence.c

+/*
+ * Copyright (c) 2007, Intel Corporation.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ *
+ * Authors: Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
+ */
+
+#include <drm/drmP.h>
+#include "psb_drv.h"
+
+
+static void psb_fence_poll(struct ttm_fence_device *fdev,
+			   uint32_t fence_class, uint32_t waiting_types)
+{
+	struct drm_psb_private *dev_priv =
+	    container_of(fdev, struct drm_psb_private, fdev);
+
+
+	if (unlikely(!dev_priv))
+		return;
+
+	if (waiting_types == 0)
+		return;
+
+	/* DRM_ERROR("Polling fence sequence, got 0x%08x\n", sequence); */
+	ttm_fence_handler(fdev, fence_class, 0 /* Sequence */,
+			_PSB_FENCE_TYPE_EXE, 0);
+}
+
+void psb_fence_error(struct drm_device *dev,
+		     uint32_t fence_class,
+		     uint32_t sequence, uint32_t type, int error)
+{
+	struct drm_psb_private *dev_priv = psb_priv(dev);
+	struct ttm_fence_device *fdev = &dev_priv->fdev;
+	unsigned long irq_flags;
+	struct ttm_fence_class_manager *fc =
+	    &fdev->fence_class[fence_class];
+
+	BUG_ON(fence_class >= PSB_NUM_ENGINES);
+	write_lock_irqsave(&fc->lock, irq_flags);
+	ttm_fence_handler(fdev, fence_class, sequence, type, error);
+	write_unlock_irqrestore(&fc->lock, irq_flags);
+}
+
+int psb_fence_emit_sequence(struct ttm_fence_device *fdev,
+			    uint32_t fence_class,
+			    uint32_t flags, uint32_t *sequence,
+			    unsigned long *timeout_jiffies)
+{
+	struct drm_psb_private *dev_priv =
+	    container_of(fdev, struct drm_psb_private, fdev);
+
+	if (!dev_priv)
+		return -EINVAL;
+
+	if (fence_class >= PSB_NUM_ENGINES)
+		return -EINVAL;
+
+	DRM_ERROR("Unexpected fence class\n");
+	return -EINVAL;
+}
+
+static void psb_fence_lockup(struct ttm_fence_object *fence,
+			     uint32_t fence_types)
+{
+	DRM_ERROR("Unsupported fence class\n");
+}
+
+void psb_fence_handler(struct drm_device *dev, uint32_t fence_class)
+{
+	struct drm_psb_private *dev_priv = psb_priv(dev);
+	struct ttm_fence_device *fdev = &dev_priv->fdev;
+	struct ttm_fence_class_manager *fc =
+	    &fdev->fence_class[fence_class];
+	unsigned long irq_flags;
+
+	write_lock_irqsave(&fc->lock, irq_flags);
+	psb_fence_poll(fdev, fence_class, fc->waiting_types);
+	write_unlock_irqrestore(&fc->lock, irq_flags);
+}
+
+
+static struct ttm_fence_driver psb_ttm_fence_driver = {
+	.has_irq = NULL,
+	.emit = psb_fence_emit_sequence,
+	.flush = NULL,
+	.poll = psb_fence_poll,
+	.needed_flush = NULL,
+	.wait = NULL,
+	.signaled = NULL,
+	.lockup = psb_fence_lockup,
+};
+
+int psb_ttm_fence_device_init(struct ttm_fence_device *fdev)
+{
+	struct drm_psb_private *dev_priv =
+		container_of(fdev, struct drm_psb_private, fdev);
+	struct ttm_fence_class_init fci = {.wrap_diff = (1 << 30),
+		.flush_diff = (1 << 29),
+		.sequence_mask = 0xFFFFFFFF
+	};
+
+	return ttm_fence_device_init(PSB_NUM_ENGINES,
+				     dev_priv->mem_global_ref.object,
+				     fdev, &fci, 1,
+				     &psb_ttm_fence_driver);
+}

drivers/staging/gma500/psb_gfx.mod.c

+#include <linux/module.h>
+#include <linux/vermagic.h>
+#include <linux/compiler.h>
+
+MODULE_INFO(vermagic, VERMAGIC_STRING);
+
+struct module __this_module
+__attribute__((section(".gnu.linkonce.this_module"))) = {
+ .name = KBUILD_MODNAME,
+ .init = init_module,
+#ifdef CONFIG_MODULE_UNLOAD
+ .exit = cleanup_module,
+#endif
+ .arch = MODULE_ARCH_INIT,
+};
+
+MODULE_INFO(staging, "Y");
+
+static const char __module_depends[]
+__used
+__attribute__((section(".modinfo"))) =
+"depends=ttm,drm,drm_kms_helper,i2c-core,cfbfillrect,cfbimgblt,cfbcopyarea,i2c-algo-bit";
+
+MODULE_ALIAS("pci:v00008086d00008108sv*sd*bc*sc*i*");
+MODULE_ALIAS("pci:v00008086d00008109sv*sd*bc*sc*i*");
+
+MODULE_INFO(srcversion, "933CCC78041722973001B78");

drivers/staging/gma500/psb_gtt.h

+/**************************************************************************
+ * Copyright (c) 2007-2008, Intel Corporation.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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, write to the Free Software Foundation, Inc., 
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ **************************************************************************/
+
+#ifndef _PSB_GTT_H_
+#define _PSB_GTT_H_
+
+#include <drm/drmP.h>
+
+/*#include "img_types.h"*/
+
+struct psb_gtt {
+	struct drm_device *dev;
+	int initialized;
+	uint32_t gatt_start;
+	uint32_t mmu_gatt_start;
+	uint32_t ci_start;
+	uint32_t rar_start;
+	uint32_t gtt_start;
+	uint32_t gtt_phys_start;
+	unsigned gtt_pages;
+	unsigned gatt_pages;
+	uint32_t stolen_base;
+	void *vram_addr;
+	uint32_t pge_ctl;
+	u16 gmch_ctrl;
+	unsigned long stolen_size;
+	unsigned long vram_stolen_size;
+	unsigned long ci_stolen_size;
+	unsigned long rar_stolen_size;
+	uint32_t *gtt_map;
+	struct rw_semaphore sem;
+};
+
+struct psb_gtt_mm {
+	struct drm_mm base;
+	struct drm_open_hash hash;
+	uint32_t count;
+	spinlock_t lock;
+};
+
+struct psb_gtt_hash_entry {
+	struct drm_open_hash ht;
+	uint32_t count;
+	struct drm_hash_item item;
+};
+
+struct psb_gtt_mem_mapping {
+	struct drm_mm_node *node;
+	struct drm_hash_item item;
+};
+
+/*Exported functions*/
+extern int psb_gtt_init(struct psb_gtt *pg, int resume);
+extern int psb_gtt_insert_pages(struct psb_gtt *pg, struct page **pages,
+				unsigned offset_pages, unsigned num_pages,
+				unsigned desired_tile_stride,
+				unsigned hw_tile_stride, int type);
+extern int psb_gtt_remove_pages(struct psb_gtt *pg, unsigned offset_pages,
+				unsigned num_pages,
+				unsigned desired_tile_stride,
+				unsigned hw_tile_stride,
+				int rc_prot);
+
+extern struct psb_gtt *psb_gtt_alloc(struct drm_device *dev);
+extern void psb_gtt_takedown(struct psb_gtt *pg, int free);
+extern int psb_gtt_map_meminfo(struct drm_device *dev,
+				void * hKernelMemInfo,
+				uint32_t *offset);
+extern int psb_gtt_unmap_meminfo(struct drm_device *dev,
+				 void * hKernelMemInfo);
+extern int psb_gtt_map_meminfo_ioctl(struct drm_device *dev, void *data,
+				     struct drm_file *file_priv);
+extern int psb_gtt_unmap_meminfo_ioctl(struct drm_device *dev, void *data,
+				       struct drm_file *file_priv);
+extern int psb_gtt_mm_init(struct psb_gtt *pg);
+extern void psb_gtt_mm_takedown(void);
+
+extern int psb_gtt_map_pvr_memory(struct drm_device *dev,
+                                                                  unsigned int hHandle,
+                                                                  unsigned int ui32TaskId,
+                                                                  dma_addr_t *pPages,
+                                                                  unsigned int ui32PagesNum,
+                                                                  unsigned int *ui32Offset);
+
+extern int psb_gtt_unmap_pvr_memory(struct drm_device *dev,
+                                                                        unsigned int hHandle,
+                                                                        unsigned int ui32TaskId);
+
+#endif

drivers/staging/gma500/psb_intel_bios.c

+/*
+ * Copyright (c) 2006 Intel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Authors:
+ *    Eric Anholt <eric@anholt.net>
+ *
+ */
+#include <drm/drmP.h>
+#include <drm/drm.h>
+#include "psb_drm.h"
+#include "psb_drv.h"
+#include "psb_intel_drv.h"
+#include "psb_intel_reg.h"
+#include "psb_intel_bios.h"
+
+
+static void *find_section(struct bdb_header *bdb, int section_id)
+{
+	u8 *base = (u8 *)bdb;
+	int index = 0;
+	u16 total, current_size;
+	u8 current_id;
+
+	/* skip to first section */
+	index += bdb->header_size;
+	total = bdb->bdb_size;
+
+	/* walk the sections looking for section_id */
+	while (index < total) {
+		current_id = *(base + index);
+		index++;
+		current_size = *((u16 *)(base + index));
+		index += 2;
+		if (current_id == section_id)
+			return base + index;
+		index += current_size;
+	}
+
+	return NULL;
+}
+
+static void fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
+			struct lvds_dvo_timing *dvo_timing)
+{
+	panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) |
+		dvo_timing->hactive_lo;
+	panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay +
+		((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo);
+	panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start +
+		dvo_timing->hsync_pulse_width;
+	panel_fixed_mode->htotal = panel_fixed_mode->hdisplay +
+		((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo);
+
+	panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) |
+		dvo_timing->vactive_lo;
+	panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay +
+		dvo_timing->vsync_off;
+	panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start +
+		dvo_timing->vsync_pulse_width;
+	panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay +
+		((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo);
+	panel_fixed_mode->clock = dvo_timing->clock * 10;
+	panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED;
+
+	/* Some VBTs have bogus h/vtotal values */
+	if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal)
+		panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1;
+	if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal)
+		panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1;
+
+	drm_mode_set_name(panel_fixed_mode);
+}
+
+static void parse_backlight_data(struct drm_psb_private *dev_priv,
+				struct bdb_header *bdb)
+{
+	struct bdb_lvds_backlight *vbt_lvds_bl = NULL;
+	struct bdb_lvds_backlight *lvds_bl;
+	u8 p_type = 0;
+	void *bl_start = NULL;
+	struct bdb_lvds_options *lvds_opts
+				= find_section(bdb, BDB_LVDS_OPTIONS);
+
+	dev_priv->lvds_bl = NULL;
+
+	if (lvds_opts) {
+		DRM_DEBUG("lvds_options found at %p\n", lvds_opts);
+		p_type = lvds_opts->panel_type;
+	} else {
+		DRM_DEBUG("no lvds_options\n");
+		return;
+	}
+
+	bl_start = find_section(bdb, BDB_LVDS_BACKLIGHT);
+	vbt_lvds_bl = (struct bdb_lvds_backlight *)(bl_start + 1) + p_type;
+
+	lvds_bl = kzalloc(sizeof(*vbt_lvds_bl), GFP_KERNEL);
+	if (!lvds_bl) {
+		DRM_DEBUG("No memory\n");
+		return;
+	}
+
+	memcpy(lvds_bl, vbt_lvds_bl, sizeof(*vbt_lvds_bl));
+
+	dev_priv->lvds_bl = lvds_bl;
+}
+
+/* Try to find integrated panel data */
+static void parse_lfp_panel_data(struct drm_psb_private *dev_priv,
+			    struct bdb_header *bdb)
+{
+	struct bdb_lvds_options *lvds_options;
+	struct bdb_lvds_lfp_data *lvds_lfp_data;
+	struct bdb_lvds_lfp_data_entry *entry;
+	struct lvds_dvo_timing *dvo_timing;
+	struct drm_display_mode *panel_fixed_mode;
+
+	/* Defaults if we can't find VBT info */
+	dev_priv->lvds_dither = 0;
+	dev_priv->lvds_vbt = 0;
+
+	lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
+	if (!lvds_options)
+		return;
+
+	dev_priv->lvds_dither = lvds_options->pixel_dither;
+	if (lvds_options->panel_type == 0xff)
+		return;
+
+	lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
+	if (!lvds_lfp_data)
+		return;
+
+	dev_priv->lvds_vbt = 1;
+
+	entry = &lvds_lfp_data->data[lvds_options->panel_type];
+	dvo_timing = &entry->dvo_timing;
+
+	panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode),
+				      GFP_KERNEL);
+
+	fill_detail_timing_data(panel_fixed_mode, dvo_timing);
+
+	dev_priv->lfp_lvds_vbt_mode = panel_fixed_mode;
+
+	DRM_DEBUG("Found panel mode in BIOS VBT tables:\n");
+	drm_mode_debug_printmodeline(panel_fixed_mode);
+
+	return;
+}
+
+/* Try to find sdvo panel data */
+static void parse_sdvo_panel_data(struct drm_psb_private *dev_priv,
+		      struct bdb_header *bdb)
+{
+	struct bdb_sdvo_lvds_options *sdvo_lvds_options;
+	struct lvds_dvo_timing *dvo_timing;
+	struct drm_display_mode *panel_fixed_mode;
+
+	dev_priv->sdvo_lvds_vbt_mode = NULL;
+
+	sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
+	if (!sdvo_lvds_options)
+		return;
+
+	dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
+	if (!dvo_timing)
+		return;
+
+	panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
+
+	if (!panel_fixed_mode)
+		return;
+
+	fill_detail_timing_data(panel_fixed_mode,
+			dvo_timing + sdvo_lvds_options->panel_type);
+
+	dev_priv->sdvo_lvds_vbt_mode = panel_fixed_mode;
+
+	return;
+}
+
+static void parse_general_features(struct drm_psb_private *dev_priv,
+		       struct bdb_header *bdb)
+{
+	struct bdb_general_features *general;
+
+	/* Set sensible defaults in case we can't find the general block */
+	dev_priv->int_tv_support = 1;
+	dev_priv->int_crt_support = 1;
+
+	general = find_section(bdb, BDB_GENERAL_FEATURES);
+	if (general) {
+		dev_priv->int_tv_support = general->int_tv_support;
+		dev_priv->int_crt_support = general->int_crt_support;
+		dev_priv->lvds_use_ssc = general->enable_ssc;
+
+		if (dev_priv->lvds_use_ssc) {
+			dev_priv->lvds_ssc_freq
+				= general->ssc_freq ? 100 : 96;
+		}
+	}
+}
+
+/**
+ * psb_intel_init_bios - initialize VBIOS settings & find VBT
+ * @dev: DRM device
+ *
+ * Loads the Video BIOS and checks that the VBT exists.  Sets scratch registers
+ * to appropriate values.
+ *
+ * VBT existence is a sanity check that is relied on by other i830_bios.c code.
+ * Note that it would be better to use a BIOS call to get the VBT, as BIOSes may
+ * feed an updated VBT back through that, compared to what we'll fetch using
+ * this method of groping around in the BIOS data.
+ *
+ * Returns 0 on success, nonzero on failure.
+ */
+bool psb_intel_init_bios(struct drm_device *dev)
+{
+	struct drm_psb_private *dev_priv = dev->dev_private;
+	struct pci_dev *pdev = dev->pdev;
+	struct vbt_header *vbt = NULL;
+	struct bdb_header *bdb;
+	u8 __iomem *bios;
+	size_t size;
+	int i;
+
+	bios = pci_map_rom(pdev, &size);
+	if (!bios)
+		return -1;
+
+	/* Scour memory looking for the VBT signature */
+	for (i = 0; i + 4 < size; i++) {
+		if (!memcmp(bios + i, "$VBT", 4)) {
+			vbt = (struct vbt_header *)(bios + i);
+			break;
+		}
+	}
+
+	if (!vbt) {
+		DRM_ERROR("VBT signature missing\n");
+		pci_unmap_rom(pdev, bios);
+		return -1;
+	}
+
+	bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
+
+	/* Grab useful general definitions */
+	parse_general_features(dev_priv, bdb);
+	parse_lfp_panel_data(dev_priv, bdb);
+	parse_sdvo_panel_data(dev_priv, bdb);
+	parse_backlight_data(dev_priv, bdb);
+
+	pci_unmap_rom(pdev, bios);
+
+	return 0;
+}
+
+/**
+ * Destory and free VBT data
+ */
+void psb_intel_destory_bios(struct drm_device *dev)
+{
+	struct drm_psb_private *dev_priv = dev->dev_private;
+	struct drm_display_mode *sdvo_lvds_vbt_mode =
+				dev_priv->sdvo_lvds_vbt_mode;
+	struct drm_display_mode *lfp_lvds_vbt_mode =
+				dev_priv->lfp_lvds_vbt_mode;
+	struct bdb_lvds_backlight *lvds_bl =
+				dev_priv->lvds_bl;
+
+	/*free sdvo panel mode*/
+	if (sdvo_lvds_vbt_mode) {
+		dev_priv->sdvo_lvds_vbt_mode = NULL;
+		kfree(sdvo_lvds_vbt_mode);
+	}
+
+	if (lfp_lvds_vbt_mode) {
+		dev_priv->lfp_lvds_vbt_mode = NULL;
+		kfree(lfp_lvds_vbt_mode);
+	}
+
+	if (lvds_bl) {
+		dev_priv->lvds_bl = NULL;
+		kfree(lvds_bl);
+	}
+}

drivers/staging/gma500/psb_intel_display.h

+/* copyright (c) 2008, Intel Corporation
+ * 
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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, write to the Free Software Foundation, Inc., 
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Authors:
+ * Eric Anholt <eric@anholt.net>
+ */
+
+#ifndef _INTEL_DISPLAY_H_
+#define _INTEL_DISPLAY_H_
+
+bool psb_intel_pipe_has_type(struct drm_crtc *crtc, int type);
+
+#endif

drivers/staging/gma500/psb_intel_modes.c

+/*
+ * Copyright (c) 2007 Intel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Authers: Jesse Barnes <jesse.barnes@intel.com>
+ */
+
+#include <linux/i2c.h>
+#include <linux/fb.h>
+#include <drm/drmP.h>
+#include "psb_intel_drv.h"
+
+/**
+ * psb_intel_ddc_probe
+ *
+ */
+bool psb_intel_ddc_probe(struct psb_intel_output *psb_intel_output)
+{
+	u8 out_buf[] = { 0x0, 0x0 };
+	u8 buf[2];
+	int ret;
+	struct i2c_msg msgs[] = {
+		{
+		 .addr = 0x50,
+		 .flags = 0,
+		 .len = 1,
+		 .buf = out_buf,
+		 },
+		{
+		 .addr = 0x50,
+		 .flags = I2C_M_RD,
+		 .len = 1,
+		 .buf = buf,
+		 }
+	};
+
+	ret = i2c_transfer(&psb_intel_output->ddc_bus->adapter, msgs, 2);
+	if (ret == 2)
+		return true;
+
+	return false;
+}
+
+/**
+ * psb_intel_ddc_get_modes - get modelist from monitor
+ * @connector: DRM connector device to use
+ *
+ * Fetch the EDID information from @connector using the DDC bus.
+ */
+int psb_intel_ddc_get_modes(struct psb_intel_output *psb_intel_output)
+{
+	struct edid *edid;
+	int ret = 0;
+
+	edid =
+	    drm_get_edid(&psb_intel_output->base,
+			 &psb_intel_output->ddc_bus->adapter);
+	if (edid) {
+		drm_mode_connector_update_edid_property(&psb_intel_output->
+							base, edid);
+		ret = drm_add_edid_modes(&psb_intel_output->base, edid);
+		kfree(edid);
+	}
+	return ret;
+}

drivers/staging/gma500/psb_irq.h

+/**************************************************************************
+ * Copyright (c) 2009, Intel Corporation.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Authors:
+ *    Benjamin Defnet <benjamin.r.defnet@intel.com>
+ *    Rajesh Poornachandran <rajesh.poornachandran@intel.com>
+ *
+ **************************************************************************/
+
+#ifndef _SYSIRQ_H_
+#define _SYSIRQ_H_
+
+#include <drm/drmP.h>
+
+bool sysirq_init(struct drm_device *dev);
+void sysirq_uninit(struct drm_device *dev);
+
+void psb_irq_preinstall(struct drm_device *dev);
+int  psb_irq_postinstall(struct drm_device *dev);
+void psb_irq_uninstall(struct drm_device *dev);
+irqreturn_t psb_irq_handler(DRM_IRQ_ARGS);
+
+void psb_irq_preinstall_islands(struct drm_device *dev, int hw_islands);
+int  psb_irq_postinstall_islands(struct drm_device *dev, int hw_islands);
+void psb_irq_uninstall_islands(struct drm_device *dev, int hw_islands);
+
+int psb_irq_enable_dpst(struct drm_device *dev);
+int psb_irq_disable_dpst(struct drm_device *dev);
+void psb_irq_turn_on_dpst(struct drm_device *dev);
+void psb_irq_turn_off_dpst(struct drm_device *dev);
+int  psb_enable_vblank(struct drm_device *dev, int pipe);
+void psb_disable_vblank(struct drm_device *dev, int pipe);
+u32  psb_get_vblank_counter(struct drm_device *dev, int pipe);
+
+#endif //_SYSIRQ_H_