gma500: Add device framework

The devices have various internal differences so we have some abstractions
to hide the ugly differences and we then wrap them up in standard
interfaces. Add these bits

Signed-off-by: Alan Cox <[e-mail]>
Signed-off-by: Dave Airlie <[e-mail]>

drivers/gpu/drm/gma500/backlight.c

···
+/*
+ * GMA500 Backlight Interface
+ *
+ * Copyright (c) 2009-2011, 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 "psb_drv.h"
+#include "psb_intel_reg.h"
+#include "psb_intel_drv.h"
+#include "intel_bios.h"
+#include "power.h"
+
+int gma_backlight_init(struct drm_device *dev)
+{
+#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
+	struct drm_psb_private *dev_priv = dev->dev_private;
+	return dev_priv->ops->backlight_init(dev);
+#else
+	return 0;
+#endif
+}
+
+void gma_backlight_exit(struct drm_device *dev)
+{
+#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
+	struct drm_psb_private *dev_priv = dev->dev_private;
+	if (dev_priv->backlight_device) {
+		dev_priv->backlight_device->props.brightness = 0;
+		backlight_update_status(dev_priv->backlight_device);
+		backlight_device_unregister(dev_priv->backlight_device);
+	}
+#endif
+}

drivers/gpu/drm/gma500/power.c

···
+/**************************************************************************
+ * Copyright (c) 2009-2011, Intel Corporation.
+ * All Rights Reserved.
+ *
+ * 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.
+ *
+ * Authors:
+ *    Benjamin Defnet <[e-mail]>
+ *    Rajesh Poornachandran <[e-mail]>
+ * Massively reworked
+ *    Alan Cox <[e-mail]>
+ */
+
+#include "power.h"
+#include "psb_drv.h"
+#include "psb_reg.h"
+#include "psb_intel_reg.h"
+#include <linux/mutex.h>
+#include <linux/pm_runtime.h>
+
+static struct mutex power_mutex;	/* Serialize power ops */
+static spinlock_t power_ctrl_lock;	/* Serialize power claim */
+
+/**
+ *	gma_power_init		-	initialise power manager
+ *	@dev: our device
+ *
+ *	Set up for power management tracking of our hardware.
+ */
+void gma_power_init(struct drm_device *dev)
+{
+	struct drm_psb_private *dev_priv = dev->dev_private;
+
+	/* FIXME: Move APM/OSPM base into relevant device code */
+	dev_priv->apm_base = dev_priv->apm_reg & 0xffff;
+	dev_priv->ospm_base &= 0xffff;
+
+	dev_priv->display_power = true;	/* We start active */
+	dev_priv->display_count = 0;	/* Currently no users */
+	dev_priv->suspended = false;	/* And not suspended */
+	spin_lock_init(&power_ctrl_lock);
+	mutex_init(&power_mutex);
+
+	dev_priv->ops->init_pm(dev);
+}
+
+/**
+ *	gma_power_uninit	-	end power manager
+ *	@dev: device to end for
+ *
+ *	Undo the effects of gma_power_init
+ */
+void gma_power_uninit(struct drm_device *dev)
+{
+	pm_runtime_disable(&dev->pdev->dev);
+	pm_runtime_set_suspended(&dev->pdev->dev);
+}
+
+/**
+ *	gma_suspend_display	-	suspend the display logic
+ *	@dev: our DRM device
+ *
+ *	Suspend the display logic of the graphics interface
+ */
+static void gma_suspend_display(struct drm_device *dev)
+{
+	struct drm_psb_private *dev_priv = dev->dev_private;
+
+	if (dev_priv->suspended)
+		return;
+	dev_priv->ops->save_regs(dev);
+	dev_priv->ops->power_down(dev);
+	dev_priv->display_power = false;
+}
+
+/**
+ *	gma_resume_display	-	resume display side logic
+ *
+ *	Resume the display hardware restoring state and enabling
+ *	as necessary.
+ */
+static void gma_resume_display(struct pci_dev *pdev)
+{
+	struct drm_device *dev = pci_get_drvdata(pdev);
+	struct drm_psb_private *dev_priv = dev->dev_private;
+
+	if (dev_priv->suspended == false)
+		return;
+
+	/* turn on the display power island */
+	dev_priv->ops->power_up(dev);
+	dev_priv->suspended = false;
+	dev_priv->display_power = true;
+
+	PSB_WVDC32(dev_priv->pge_ctl | _PSB_PGETBL_ENABLED, PSB_PGETBL_CTL);
+	pci_write_config_word(pdev, PSB_GMCH_CTRL,
+			dev_priv->gmch_ctrl | _PSB_GMCH_ENABLED);
+	dev_priv->ops->restore_regs(dev);
+}
+
+/**
+ *	gma_suspend_pci		-	suspend PCI side
+ *	@pdev: PCI device
+ *
+ *	Perform the suspend processing on our PCI device state
+ */
+static void gma_suspend_pci(struct pci_dev *pdev)
+{
+	struct drm_device *dev = pci_get_drvdata(pdev);
+	struct drm_psb_private *dev_priv = dev->dev_private;
+	int bsm, vbt;
+
+	if (dev_priv->suspended)
+		return;
+
+	pci_save_state(pdev);
+	pci_read_config_dword(pdev, 0x5C, &bsm);
+	dev_priv->saveBSM = bsm;
+	pci_read_config_dword(pdev, 0xFC, &vbt);
+	dev_priv->saveVBT = vbt;
+	pci_read_config_dword(pdev, PSB_PCIx_MSI_ADDR_LOC, &dev_priv->msi_addr);
+	pci_read_config_dword(pdev, PSB_PCIx_MSI_DATA_LOC, &dev_priv->msi_data);
+
+	pci_disable_device(pdev);
+	pci_set_power_state(pdev, PCI_D3hot);
+
+	dev_priv->suspended = true;
+}
+
+/**
+ *	gma_resume_pci		-	resume helper
+ *	@dev: our PCI device
+ *
+ *	Perform the resume processing on our PCI device state - rewrite
+ *	register state and re-enable the PCI device
+ */
+static bool gma_resume_pci(struct pci_dev *pdev)
+{
+	struct drm_device *dev = pci_get_drvdata(pdev);
+	struct drm_psb_private *dev_priv = dev->dev_private;
+	int ret;
+
+	if (!dev_priv->suspended)
+		return true;
+
+	pci_set_power_state(pdev, PCI_D0);
+	pci_restore_state(pdev);
+	pci_write_config_dword(pdev, 0x5c, dev_priv->saveBSM);
+	pci_write_config_dword(pdev, 0xFC, dev_priv->saveVBT);
+	/* restoring MSI address and data in PCIx space */
+	pci_write_config_dword(pdev, PSB_PCIx_MSI_ADDR_LOC, dev_priv->msi_addr);
+	pci_write_config_dword(pdev, PSB_PCIx_MSI_DATA_LOC, dev_priv->msi_data);
+	ret = pci_enable_device(pdev);
+
+	if (ret != 0)
+		dev_err(&pdev->dev, "pci_enable failed: %d\n", ret);
+	else
+		dev_priv->suspended = false;
+	return !dev_priv->suspended;
+}
+
+/**
+ *	gma_power_suspend		-	bus callback for suspend
+ *	@pdev: our PCI device
+ *	@state: suspend type
+ *
+ *	Called back by the PCI layer during a suspend of the system. We
+ *	perform the necessary shut down steps and save enough state that
+ *	we can undo this when resume is called.
+ */
+int gma_power_suspend(struct device *_dev)
+{
+	struct pci_dev *pdev = container_of(_dev, struct pci_dev, dev);
+	struct drm_device *dev = pci_get_drvdata(pdev);
+	struct drm_psb_private *dev_priv = dev->dev_private;
+
+	mutex_lock(&power_mutex);
+	if (!dev_priv->suspended) {
+		if (dev_priv->display_count) {
+			mutex_unlock(&power_mutex);
+			return -EBUSY;
+		}
+		psb_irq_uninstall(dev);
+		gma_suspend_display(dev);
+		gma_suspend_pci(pdev);
+	}
+	mutex_unlock(&power_mutex);
+	return 0;
+}
+
+/**
+ *	gma_power_resume		-	resume power
+ *	@pdev: PCI device
+ *
+ *	Resume the PCI side of the graphics and then the displays
+ */
+int gma_power_resume(struct device *_dev)
+{
+	struct pci_dev *pdev = container_of(_dev, struct pci_dev, dev);
+	struct drm_device *dev = pci_get_drvdata(pdev);
+
+	mutex_lock(&power_mutex);
+	gma_resume_pci(pdev);
+	gma_resume_display(pdev);
+	psb_irq_preinstall(dev);
+	psb_irq_postinstall(dev);
+	mutex_unlock(&power_mutex);
+	return 0;
+}
+
+/**
+ *	gma_power_is_on		-	returne true if power is on
+ *	@dev: our DRM device
+ *
+ *	Returns true if the display island power is on at this moment
+ */
+bool gma_power_is_on(struct drm_device *dev)
+{
+	struct drm_psb_private *dev_priv = dev->dev_private;
+	return dev_priv->display_power;
+}
+
+/**
+ *	gma_power_begin		-	begin requiring power
+ *	@dev: our DRM device
+ *	@force_on: true to force power on
+ *
+ *	Begin an action that requires the display power island is enabled.
+ *	We refcount the islands.
+ */
+bool gma_power_begin(struct drm_device *dev, bool force_on)
+{
+	struct drm_psb_private *dev_priv = dev->dev_private;
+	int ret;
+	unsigned long flags;
+
+	spin_lock_irqsave(&power_ctrl_lock, flags);
+	/* Power already on ? */
+	if (dev_priv->display_power) {
+		dev_priv->display_count++;
+		pm_runtime_get(&dev->pdev->dev);
+		spin_unlock_irqrestore(&power_ctrl_lock, flags);
+		return true;
+	}
+	if (force_on == false)
+		goto out_false;
+
+	/* Ok power up needed */
+	ret = gma_resume_pci(dev->pdev);
+	if (ret == 0) {
+		psb_irq_preinstall(dev);
+		psb_irq_postinstall(dev);
+		pm_runtime_get(&dev->pdev->dev);
+		dev_priv->display_count++;
+		spin_unlock_irqrestore(&power_ctrl_lock, flags);
+		return true;
+	}
+out_false:
+	spin_unlock_irqrestore(&power_ctrl_lock, flags);
+	return false;
+}
+
+/**
+ *	gma_power_end		-	end use of power
+ *	@dev: Our DRM device
+ *
+ *	Indicate that one of our gma_power_begin() requested periods when
+ *	the diplay island power is needed has completed.
+ */
+void gma_power_end(struct drm_device *dev)
+{
+	struct drm_psb_private *dev_priv = dev->dev_private;
+	unsigned long flags;
+	spin_lock_irqsave(&power_ctrl_lock, flags);
+	dev_priv->display_count--;
+	WARN_ON(dev_priv->display_count < 0);
+	spin_unlock_irqrestore(&power_ctrl_lock, flags);
+	pm_runtime_put(&dev->pdev->dev);
+}
+
+int psb_runtime_suspend(struct device *dev)
+{
+	return gma_power_suspend(dev);
+}
+
+int psb_runtime_resume(struct device *dev)
+{
+	return 0;
+}
+
+int psb_runtime_idle(struct device *dev)
+{
+	struct drm_device *drmdev = pci_get_drvdata(to_pci_dev(dev));
+	struct drm_psb_private *dev_priv = drmdev->dev_private;
+	if (dev_priv->display_count)
+		return 0;
+	else
+		return 1;
+}

drivers/gpu/drm/gma500/power.h

···
+/**************************************************************************
+ * Copyright (c) 2009-2011, Intel Corporation.
+ * All Rights Reserved.
+
+ * 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.
+ *
+ * Authors:
+ *    Benjamin Defnet <[e-mail]>
+ *    Rajesh Poornachandran <[e-mail]>
+ * Massively reworked
+ *    Alan Cox <[e-mail]>
+ */
+#ifndef _PSB_POWERMGMT_H_
+#define _PSB_POWERMGMT_H_
+
+#include <linux/pci.h>
+#include <drm/drmP.h>
+
+void gma_power_init(struct drm_device *dev);
+void gma_power_uninit(struct drm_device *dev);
+
+/*
+ * The kernel bus power management  will call these functions
+ */
+int gma_power_suspend(struct device *dev);
+int gma_power_resume(struct device *dev);
+
+/*
+ * These are the functions the driver should use to wrap all hw access
+ * (i.e. register reads and writes)
+ */
+bool gma_power_begin(struct drm_device *dev, bool force);
+void gma_power_end(struct drm_device *dev);
+
+/*
+ * Use this function to do an instantaneous check for if the hw is on.
+ * Only use this in cases where you know the mutex is already held such
+ * as in irq install/uninstall and you need to
+ * prevent a deadlock situation.  Otherwise use gma_power_begin().
+ */
+bool gma_power_is_on(struct drm_device *dev);
+
+/*
+ * GFX-Runtime PM callbacks
+ */
+int psb_runtime_suspend(struct device *dev);
+int psb_runtime_resume(struct device *dev);
+int psb_runtime_idle(struct device *dev);
+
+#endif /*_PSB_POWERMGMT_H_*/