[PATCH 05/12] gma500: Add device framework
Alan Cox
alan at lxorguk.ukuu.org.uk
Thu Nov 3 11:21:31 PDT 2011
From: Alan Cox <alan at linux.intel.com>
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 <alan at linux.intel.com>
---
drivers/gpu/drm/gma500/backlight.c | 49 ++++++
drivers/gpu/drm/gma500/power.c | 316 ++++++++++++++++++++++++++++++++++++
drivers/gpu/drm/gma500/power.h | 67 ++++++++
3 files changed, 432 insertions(+), 0 deletions(-)
create mode 100644 drivers/gpu/drm/gma500/backlight.c
create mode 100644 drivers/gpu/drm/gma500/power.c
create mode 100644 drivers/gpu/drm/gma500/power.h
diff --git a/drivers/gpu/drm/gma500/backlight.c b/drivers/gpu/drm/gma500/backlight.c
new file mode 100644
index 0000000..2079395
--- /dev/null
+++ b/drivers/gpu/drm/gma500/backlight.c
@@ -0,0 +1,49 @@
+/*
+ * 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
+}
diff --git a/drivers/gpu/drm/gma500/power.c b/drivers/gpu/drm/gma500/power.c
new file mode 100644
index 0000000..972bea7
--- /dev/null
+++ b/drivers/gpu/drm/gma500/power.c
@@ -0,0 +1,316 @@
+/**************************************************************************
+ * 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 <benjamin.r.defnet at intel.com>
+ * Rajesh Poornachandran <rajesh.poornachandran at intel.com>
+ * Massively reworked
+ * Alan Cox <alan at linux.intel.com>
+ */
+
+#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;
+}
diff --git a/drivers/gpu/drm/gma500/power.h b/drivers/gpu/drm/gma500/power.h
new file mode 100644
index 0000000..1969d2e
--- /dev/null
+++ b/drivers/gpu/drm/gma500/power.h
@@ -0,0 +1,67 @@
+/**************************************************************************
+ * 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 <benjamin.r.defnet at intel.com>
+ * Rajesh Poornachandran <rajesh.poornachandran at intel.com>
+ * Massively reworked
+ * Alan Cox <alan at linux.intel.com>
+ */
+#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_*/
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