[mirror_ubuntu-zesty-kernel.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);

	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->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);
			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
	61	dev_priv->ops->init_pm(dev);
	62	}
	63
	64	/**
65	* gma_power_uninit - end power manager
66	* @dev: device to end for
67	*
68	* Undo the effects of gma_power_init
69	*/
70	void gma_power_uninit(struct drm_device *dev)
71	{
72	pm_runtime_disable(&dev->pdev->dev);
73	pm_runtime_set_suspended(&dev->pdev->dev);
74	}
75
76	/**
77	* gma_suspend_display - suspend the display logic
78	* @dev: our DRM device
79	*
80	* Suspend the display logic of the graphics interface
81	*/
82	static void gma_suspend_display(struct drm_device *dev)
83	{
84	struct drm_psb_private *dev_priv = dev->dev_private;
85
86	if (dev_priv->suspended)
87	return;
88	dev_priv->ops->save_regs(dev);
89	dev_priv->ops->power_down(dev);
90	dev_priv->display_power = false;
91	}
92
93	/**
94	* gma_resume_display - resume display side logic
95	*
96	* Resume the display hardware restoring state and enabling
97	* as necessary.
98	*/
99	static void gma_resume_display(struct pci_dev *pdev)
100	{
101	struct drm_device *dev = pci_get_drvdata(pdev);
102	struct drm_psb_private *dev_priv = dev->dev_private;
103
104	if (dev_priv->suspended == false)
105	return;
106
107	/* turn on the display power island */
108	dev_priv->ops->power_up(dev);
109	dev_priv->suspended = false;
110	dev_priv->display_power = true;
111
112	PSB_WVDC32(dev_priv->pge_ctl \| _PSB_PGETBL_ENABLED, PSB_PGETBL_CTL);
113	pci_write_config_word(pdev, PSB_GMCH_CTRL,
114	dev_priv->gmch_ctrl \| _PSB_GMCH_ENABLED);
115	dev_priv->ops->restore_regs(dev);
116	}
117
118	/**
119	* gma_suspend_pci - suspend PCI side
120	* @pdev: PCI device
121	*
122	* Perform the suspend processing on our PCI device state
123	*/
124	static void gma_suspend_pci(struct pci_dev *pdev)
125	{
126	struct drm_device *dev = pci_get_drvdata(pdev);
127	struct drm_psb_private *dev_priv = dev->dev_private;
128	int bsm, vbt;
129
130	if (dev_priv->suspended)
131	return;
132
133	pci_save_state(pdev);
134	pci_read_config_dword(pdev, 0x5C, &bsm);
648a8e34	135	dev_priv->regs.saveBSM = bsm;
bbbb262d	136	pci_read_config_dword(pdev, 0xFC, &vbt);
648a8e34	137	dev_priv->regs.saveVBT = vbt;
bbbb262d AC	138	pci_read_config_dword(pdev, PSB_PCIx_MSI_ADDR_LOC, &dev_priv->msi_addr);
	139	pci_read_config_dword(pdev, PSB_PCIx_MSI_DATA_LOC, &dev_priv->msi_data);
	140
	141	pci_disable_device(pdev);
	142	pci_set_power_state(pdev, PCI_D3hot);
	143
	144	dev_priv->suspended = true;
	145	}
	146
	147	/**
	148	* gma_resume_pci - resume helper
	149	* @dev: our PCI device
	150	*
	151	* Perform the resume processing on our PCI device state - rewrite
	152	* register state and re-enable the PCI device
	153	*/
	154	static bool gma_resume_pci(struct pci_dev *pdev)
	155	{
	156	struct drm_device *dev = pci_get_drvdata(pdev);
	157	struct drm_psb_private *dev_priv = dev->dev_private;
	158	int ret;
	159
	160	if (!dev_priv->suspended)
	161	return true;
	162
	163	pci_set_power_state(pdev, PCI_D0);
	164	pci_restore_state(pdev);
648a8e34 AC	165	pci_write_config_dword(pdev, 0x5c, dev_priv->regs.saveBSM);
648a8e34 AC	166	pci_write_config_dword(pdev, 0xFC, dev_priv->regs.saveVBT);
bbbb262d AC	167	/* restoring MSI address and data in PCIx space */
	168	pci_write_config_dword(pdev, PSB_PCIx_MSI_ADDR_LOC, dev_priv->msi_addr);
	169	pci_write_config_dword(pdev, PSB_PCIx_MSI_DATA_LOC, dev_priv->msi_data);
	170	ret = pci_enable_device(pdev);
	171
	172	if (ret != 0)
	173	dev_err(&pdev->dev, "pci_enable failed: %d\n", ret);
	174	else
	175	dev_priv->suspended = false;
	176	return !dev_priv->suspended;
	177	}
	178
	179	/**
	180	* gma_power_suspend - bus callback for suspend
	181	* @pdev: our PCI device
	182	* @state: suspend type
	183	*
	184	* Called back by the PCI layer during a suspend of the system. We
	185	* perform the necessary shut down steps and save enough state that
	186	* we can undo this when resume is called.
	187	*/
	188	int gma_power_suspend(struct device *_dev)
	189	{
	190	struct pci_dev *pdev = container_of(_dev, struct pci_dev, dev);
	191	struct drm_device *dev = pci_get_drvdata(pdev);
	192	struct drm_psb_private *dev_priv = dev->dev_private;
	193
	194	mutex_lock(&power_mutex);
	195	if (!dev_priv->suspended) {
	196	if (dev_priv->display_count) {
	197	mutex_unlock(&power_mutex);
	198	return -EBUSY;
	199	}
	200	psb_irq_uninstall(dev);
	201	gma_suspend_display(dev);
	202	gma_suspend_pci(pdev);
	203	}
	204	mutex_unlock(&power_mutex);
	205	return 0;
	206	}
	207
	208	/**
	209	* gma_power_resume - resume power
	210	* @pdev: PCI device
	211	*
	212	* Resume the PCI side of the graphics and then the displays
	213	*/
	214	int gma_power_resume(struct device *_dev)
	215	{
	216	struct pci_dev *pdev = container_of(_dev, struct pci_dev, dev);
	217	struct drm_device *dev = pci_get_drvdata(pdev);
	218
	219	mutex_lock(&power_mutex);
	220	gma_resume_pci(pdev);
	221	gma_resume_display(pdev);
	222	psb_irq_preinstall(dev);
	223	psb_irq_postinstall(dev);
	224	mutex_unlock(&power_mutex);
	225	return 0;
	226	}
	227
	228	/**
	229	* gma_power_is_on - returne true if power is on
	230	* @dev: our DRM device
231	*
232	* Returns true if the display island power is on at this moment
233	*/
234	bool gma_power_is_on(struct drm_device *dev)
235	{
236	struct drm_psb_private *dev_priv = dev->dev_private;
237	return dev_priv->display_power;
238	}
239
240	/**
241	* gma_power_begin - begin requiring power
242	* @dev: our DRM device
243	* @force_on: true to force power on
244	*
245	* Begin an action that requires the display power island is enabled.
246	* We refcount the islands.
247	*/
248	bool gma_power_begin(struct drm_device *dev, bool force_on)
249	{
250	struct drm_psb_private *dev_priv = dev->dev_private;
251	int ret;
252	unsigned long flags;
253
254	spin_lock_irqsave(&power_ctrl_lock, flags);
255	/* Power already on ? */
256	if (dev_priv->display_power) {
257	dev_priv->display_count++;
258	pm_runtime_get(&dev->pdev->dev);
259	spin_unlock_irqrestore(&power_ctrl_lock, flags);
260	return true;
261	}
262	if (force_on == false)
263	goto out_false;
264
265	/* Ok power up needed */
266	ret = gma_resume_pci(dev->pdev);
267	if (ret == 0) {
268	psb_irq_preinstall(dev);
269	psb_irq_postinstall(dev);
270	pm_runtime_get(&dev->pdev->dev);
271	dev_priv->display_count++;
272	spin_unlock_irqrestore(&power_ctrl_lock, flags);
273	return true;
274	}
275	out_false:
276	spin_unlock_irqrestore(&power_ctrl_lock, flags);
277	return false;
278	}
279
280	/**
281	* gma_power_end - end use of power
282	* @dev: Our DRM device
283	*
284	* Indicate that one of our gma_power_begin() requested periods when
285	* the diplay island power is needed has completed.
286	*/
287	void gma_power_end(struct drm_device *dev)
288	{
289	struct drm_psb_private *dev_priv = dev->dev_private;
290	unsigned long flags;
291	spin_lock_irqsave(&power_ctrl_lock, flags);
292	dev_priv->display_count--;
293	WARN_ON(dev_priv->display_count < 0);
294	spin_unlock_irqrestore(&power_ctrl_lock, flags);
295	pm_runtime_put(&dev->pdev->dev);
296	}
297
298	int psb_runtime_suspend(struct device *dev)
299	{
300	return gma_power_suspend(dev);
301	}
302
303	int psb_runtime_resume(struct device *dev)
304	{
1f0d0b51	305	return gma_power_resume(dev);;
bbbb262d AC	306	}
	307
	308	int psb_runtime_idle(struct device *dev)
	309	{
	310	struct drm_device *drmdev = pci_get_drvdata(to_pci_dev(dev));
	311	struct drm_psb_private *dev_priv = drmdev->dev_private;
	312	if (dev_priv->display_count)
	313	return 0;
	314	else
	315	return 1;
	316	}