[deliverable/linux.git] / 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 <benjamin.r.defnet@intel.com>
 *    Rajesh Poornachandran <rajesh.poornachandran@intel.com>
 * Massively reworked
 *    Alan Cox <alan@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);

	if (dev_priv->ops->init_pm)
		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;

	/* 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->regs.saveBSM = bsm;
	pci_read_config_dword(pdev, 0xFC, &vbt);
	dev_priv->regs.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->regs.saveBSM);
	pci_write_config_dword(pdev, 0xFC, dev_priv->regs.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);
			dev_err(dev->dev, "GPU hardware busy, cannot suspend\n");
			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 gma_power_resume(dev);
}

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;
}
Commit	Line	Data
bbbb262d AC	1	/**************************************************************************
	2	* Copyright (c) 2009-2011, Intel Corporation.
	3	* All Rights Reserved.
	4	*
	5	* Permission is hereby granted, free of charge, to any person obtaining a
	6	* copy of this software and associated documentation files (the "Software"),
	7	* to deal in the Software without restriction, including without limitation
	8	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	9	* and/or sell copies of the Software, and to permit persons to whom the
	10	* Software is furnished to do so, subject to the following conditions:
	11	*
	12	* The above copyright notice and this permission notice (including the next
	13	* paragraph) shall be included in all copies or substantial portions of the
	14	* Software.
	15	*
	16	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	17	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	18	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	19	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	20	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	21	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	22	* SOFTWARE.
	23	*
	24	* Authors:
	25	* Benjamin Defnet <benjamin.r.defnet@intel.com>
	26	* Rajesh Poornachandran <rajesh.poornachandran@intel.com>
	27	* Massively reworked
	28	* Alan Cox <alan@linux.intel.com>
	29	*/
	30
	31	#include "power.h"
	32	#include "psb_drv.h"
	33	#include "psb_reg.h"
	34	#include "psb_intel_reg.h"
	35	#include <linux/mutex.h>
	36	#include <linux/pm_runtime.h>
	37
	38	static struct mutex power_mutex; /* Serialize power ops */
	39	static spinlock_t power_ctrl_lock; /* Serialize power claim */
	40
	41	/**
	42	* gma_power_init - initialise power manager
	43	* @dev: our device
	44	*
	45	* Set up for power management tracking of our hardware.
	46	*/
	47	void gma_power_init(struct drm_device *dev)
	48	{
	49	struct drm_psb_private *dev_priv = dev->dev_private;
	50
	51	/* FIXME: Move APM/OSPM base into relevant device code */
	52	dev_priv->apm_base = dev_priv->apm_reg & 0xffff;
	53	dev_priv->ospm_base &= 0xffff;
	54
	55	dev_priv->display_power = true; /* We start active */
	56	dev_priv->display_count = 0; /* Currently no users */
	57	dev_priv->suspended = false; /* And not suspended */
	58	spin_lock_init(&power_ctrl_lock);
	59	mutex_init(&power_mutex);
	60
c715bc1b KS	61	if (dev_priv->ops->init_pm)
c715bc1b KS	62	dev_priv->ops->init_pm(dev);
bbbb262d AC	63	}
	64
	65	/**
	66	* gma_power_uninit - end power manager
	67	* @dev: device to end for
	68	*
	69	* Undo the effects of gma_power_init
	70	*/
	71	void gma_power_uninit(struct drm_device *dev)
	72	{
	73	pm_runtime_disable(&dev->pdev->dev);
	74	pm_runtime_set_suspended(&dev->pdev->dev);
	75	}
	76
	77	/**
	78	* gma_suspend_display - suspend the display logic
	79	* @dev: our DRM device
	80	*
	81	* Suspend the display logic of the graphics interface
	82	*/
	83	static void gma_suspend_display(struct drm_device *dev)
	84	{
	85	struct drm_psb_private *dev_priv = dev->dev_private;
	86
	87	if (dev_priv->suspended)
	88	return;
	89	dev_priv->ops->save_regs(dev);
	90	dev_priv->ops->power_down(dev);
	91	dev_priv->display_power = false;
	92	}
	93
	94	/**
	95	* gma_resume_display - resume display side logic
	96	*
	97	* Resume the display hardware restoring state and enabling
	98	* as necessary.
	99	*/
	100	static void gma_resume_display(struct pci_dev *pdev)
	101	{
	102	struct drm_device *dev = pci_get_drvdata(pdev);
	103	struct drm_psb_private *dev_priv = dev->dev_private;
	104
bbbb262d AC	105	/* turn on the display power island */
	106	dev_priv->ops->power_up(dev);
	107	dev_priv->suspended = false;
	108	dev_priv->display_power = true;
	109
	110	PSB_WVDC32(dev_priv->pge_ctl \| _PSB_PGETBL_ENABLED, PSB_PGETBL_CTL);
	111	pci_write_config_word(pdev, PSB_GMCH_CTRL,
	112	dev_priv->gmch_ctrl \| _PSB_GMCH_ENABLED);
	113	dev_priv->ops->restore_regs(dev);
	114	}
	115
	116	/**
	117	* gma_suspend_pci - suspend PCI side
	118	* @pdev: PCI device
	119	*
	120	* Perform the suspend processing on our PCI device state
	121	*/
	122	static void gma_suspend_pci(struct pci_dev *pdev)
	123	{
	124	struct drm_device *dev = pci_get_drvdata(pdev);
	125	struct drm_psb_private *dev_priv = dev->dev_private;
	126	int bsm, vbt;
	127
	128	if (dev_priv->suspended)
	129	return;
	130
	131	pci_save_state(pdev);
	132	pci_read_config_dword(pdev, 0x5C, &bsm);
648a8e34	133	dev_priv->regs.saveBSM = bsm;
bbbb262d	134	pci_read_config_dword(pdev, 0xFC, &vbt);
648a8e34	135	dev_priv->regs.saveVBT = vbt;
bbbb262d AC	136	pci_read_config_dword(pdev, PSB_PCIx_MSI_ADDR_LOC, &dev_priv->msi_addr);
	137	pci_read_config_dword(pdev, PSB_PCIx_MSI_DATA_LOC, &dev_priv->msi_data);
	138
	139	pci_disable_device(pdev);
	140	pci_set_power_state(pdev, PCI_D3hot);
	141
	142	dev_priv->suspended = true;
	143	}
	144
	145	/**
	146	* gma_resume_pci - resume helper
	147	* @dev: our PCI device
	148	*
	149	* Perform the resume processing on our PCI device state - rewrite
	150	* register state and re-enable the PCI device
	151	*/
	152	static bool gma_resume_pci(struct pci_dev *pdev)
	153	{
	154	struct drm_device *dev = pci_get_drvdata(pdev);
	155	struct drm_psb_private *dev_priv = dev->dev_private;
	156	int ret;
	157
	158	if (!dev_priv->suspended)
	159	return true;
	160
	161	pci_set_power_state(pdev, PCI_D0);
	162	pci_restore_state(pdev);
648a8e34 AC	163	pci_write_config_dword(pdev, 0x5c, dev_priv->regs.saveBSM);
648a8e34 AC	164	pci_write_config_dword(pdev, 0xFC, dev_priv->regs.saveVBT);
bbbb262d AC	165	/* restoring MSI address and data in PCIx space */
	166	pci_write_config_dword(pdev, PSB_PCIx_MSI_ADDR_LOC, dev_priv->msi_addr);
	167	pci_write_config_dword(pdev, PSB_PCIx_MSI_DATA_LOC, dev_priv->msi_data);
	168	ret = pci_enable_device(pdev);
	169
	170	if (ret != 0)
	171	dev_err(&pdev->dev, "pci_enable failed: %d\n", ret);
	172	else
	173	dev_priv->suspended = false;
	174	return !dev_priv->suspended;
	175	}
	176
	177	/**
	178	* gma_power_suspend - bus callback for suspend
	179	* @pdev: our PCI device
	180	* @state: suspend type
	181	*
	182	* Called back by the PCI layer during a suspend of the system. We
	183	* perform the necessary shut down steps and save enough state that
	184	* we can undo this when resume is called.
	185	*/
	186	int gma_power_suspend(struct device *_dev)
	187	{
	188	struct pci_dev *pdev = container_of(_dev, struct pci_dev, dev);
	189	struct drm_device *dev = pci_get_drvdata(pdev);
	190	struct drm_psb_private *dev_priv = dev->dev_private;
	191
	192	mutex_lock(&power_mutex);
	193	if (!dev_priv->suspended) {
	194	if (dev_priv->display_count) {
	195	mutex_unlock(&power_mutex);
09016a11	196	dev_err(dev->dev, "GPU hardware busy, cannot suspend\n");
bbbb262d AC	197	return -EBUSY;
	198	}
	199	psb_irq_uninstall(dev);
	200	gma_suspend_display(dev);
	201	gma_suspend_pci(pdev);
	202	}
	203	mutex_unlock(&power_mutex);
	204	return 0;
	205	}
	206
	207	/**
	208	* gma_power_resume - resume power
	209	* @pdev: PCI device
	210	*
	211	* Resume the PCI side of the graphics and then the displays
	212	*/
	213	int gma_power_resume(struct device *_dev)
	214	{
	215	struct pci_dev *pdev = container_of(_dev, struct pci_dev, dev);
	216	struct drm_device *dev = pci_get_drvdata(pdev);
	217
	218	mutex_lock(&power_mutex);
	219	gma_resume_pci(pdev);
	220	gma_resume_display(pdev);
	221	psb_irq_preinstall(dev);
	222	psb_irq_postinstall(dev);
	223	mutex_unlock(&power_mutex);
	224	return 0;
	225	}
	226
	227	/**
	228	* gma_power_is_on - returne true if power is on
	229	* @dev: our DRM device
	230	*
	231	* Returns true if the display island power is on at this moment
	232	*/
	233	bool gma_power_is_on(struct drm_device *dev)
	234	{
	235	struct drm_psb_private *dev_priv = dev->dev_private;
	236	return dev_priv->display_power;
	237	}
	238
	239	/**
	240	* gma_power_begin - begin requiring power
	241	* @dev: our DRM device
	242	* @force_on: true to force power on
	243	*
	244	* Begin an action that requires the display power island is enabled.
	245	* We refcount the islands.
	246	*/
	247	bool gma_power_begin(struct drm_device *dev, bool force_on)
	248	{
	249	struct drm_psb_private *dev_priv = dev->dev_private;
	250	int ret;
	251	unsigned long flags;
	252
	253	spin_lock_irqsave(&power_ctrl_lock, flags);
	254	/* Power already on ? */
	255	if (dev_priv->display_power) {
	256	dev_priv->display_count++;
	257	pm_runtime_get(&dev->pdev->dev);
	258	spin_unlock_irqrestore(&power_ctrl_lock, flags);
	259	return true;
	260	}
261	if (force_on == false)
262	goto out_false;
263
264	/* Ok power up needed */
265	ret = gma_resume_pci(dev->pdev);
266	if (ret == 0) {
267	psb_irq_preinstall(dev);
268	psb_irq_postinstall(dev);
269	pm_runtime_get(&dev->pdev->dev);
270	dev_priv->display_count++;
271	spin_unlock_irqrestore(&power_ctrl_lock, flags);
272	return true;
273	}
274	out_false:
275	spin_unlock_irqrestore(&power_ctrl_lock, flags);
276	return false;
277	}
278
279	/**
280	* gma_power_end - end use of power
281	* @dev: Our DRM device
282	*
283	* Indicate that one of our gma_power_begin() requested periods when
284	* the diplay island power is needed has completed.
285	*/
286	void gma_power_end(struct drm_device *dev)
287	{
288	struct drm_psb_private *dev_priv = dev->dev_private;
289	unsigned long flags;
290	spin_lock_irqsave(&power_ctrl_lock, flags);
291	dev_priv->display_count--;
292	WARN_ON(dev_priv->display_count < 0);
293	spin_unlock_irqrestore(&power_ctrl_lock, flags);
294	pm_runtime_put(&dev->pdev->dev);
295	}
296
297	int psb_runtime_suspend(struct device *dev)
298	{
299	return gma_power_suspend(dev);
300	}
301
302	int psb_runtime_resume(struct device *dev)
303	{
09016a11	304	return gma_power_resume(dev);
bbbb262d AC	305	}
	306
	307	int psb_runtime_idle(struct device *dev)
	308	{
	309	struct drm_device *drmdev = pci_get_drvdata(to_pci_dev(dev));
	310	struct drm_psb_private *dev_priv = drmdev->dev_private;
	311	if (dev_priv->display_count)
	312	return 0;
	313	else
	314	return 1;
	315	}