/* i915_drv.c -- i830,i845,i855,i865,i915 driver -*- linux-c -*-
 */
/*
 *
 * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
 * 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, sub license, 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 NON-INFRINGEMENT.
 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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.
 *
 */

#include <linux/device.h>
#include "drmP.h"
#include "drm.h"
#include "i915_drm.h"
#include "i915_drv.h"

#include "drm_pciids.h"
#include <linux/console.h>
#include "drm_crtc_helper.h"

static int i915_modeset = -1;
module_param_named(modeset, i915_modeset, int, 0400);

unsigned int i915_fbpercrtc = 0;
module_param_named(fbpercrtc, i915_fbpercrtc, int, 0400);

unsigned int i915_powersave = 1;
module_param_named(powersave, i915_powersave, int, 0400);

static struct drm_driver driver;

static struct pci_device_id pciidlist[] = {
        i915_PCI_IDS
};

#if defined(CONFIG_DRM_I915_KMS)
MODULE_DEVICE_TABLE(pci, pciidlist);
#endif

static int i915_suspend(struct drm_device *dev, pm_message_t state)
{
        struct drm_i915_private *dev_priv = dev->dev_private;

        if (!dev || !dev_priv) {
                DRM_ERROR("dev: %p, dev_priv: %p\n", dev, dev_priv);
                DRM_ERROR("DRM not initialized, aborting suspend.\n");
                return -ENODEV;
        }

        if (state.event == PM_EVENT_PRETHAW)
                return 0;

        pci_save_state(dev->pdev);

        /* If KMS is active, we do the leavevt stuff here */
        if (drm_core_check_feature(dev, DRIVER_MODESET)) {
                if (i915_gem_idle(dev))
                        dev_err(&dev->pdev->dev,
                                "GEM idle failed, resume may fail\n");
                drm_irq_uninstall(dev);
        }

        i915_save_state(dev);

        intel_opregion_free(dev, 1);

        if (state.event == PM_EVENT_SUSPEND) {
                /* Shut down the device */
                pci_disable_device(dev->pdev);
                pci_set_power_state(dev->pdev, PCI_D3hot);
        }

        /* Modeset on resume, not lid events */
        dev_priv->modeset_on_lid = 0;

        return 0;
}

static int i915_resume(struct drm_device *dev)
{
        struct drm_i915_private *dev_priv = dev->dev_private;
        int ret = 0;

        if (pci_enable_device(dev->pdev))
                return -1;
        pci_set_master(dev->pdev);

        i915_restore_state(dev);

        intel_opregion_init(dev, 1);

        /* KMS EnterVT equivalent */
        if (drm_core_check_feature(dev, DRIVER_MODESET)) {
                mutex_lock(&dev->struct_mutex);
                dev_priv->mm.suspended = 0;

                ret = i915_gem_init_ringbuffer(dev);
                if (ret != 0)
                        ret = -1;
                mutex_unlock(&dev->struct_mutex);

                drm_irq_install(dev);
        }
        if (drm_core_check_feature(dev, DRIVER_MODESET)) {
                /* Resume the modeset for every activated CRTC */
                drm_helper_resume_force_mode(dev);
        }

        dev_priv->modeset_on_lid = 0;

        return ret;
}

/**
 * i965_reset - reset chip after a hang
 * @dev: drm device to reset
 * @flags: reset domains
 *
 * Reset the chip.  Useful if a hang is detected. Returns zero on successful
 * reset or otherwise an error code.
 *
 * Procedure is fairly simple:
 *   - reset the chip using the reset reg
 *   - re-init context state
 *   - re-init hardware status page
 *   - re-init ring buffer
 *   - re-init interrupt state
 *   - re-init display
 */
int i965_reset(struct drm_device *dev, u8 flags)
{
        drm_i915_private_t *dev_priv = dev->dev_private;
        unsigned long timeout;
        u8 gdrst;
        /*
         * We really should only reset the display subsystem if we actually
         * need to
         */
        bool need_display = true;

        mutex_lock(&dev->struct_mutex);

        /*
         * Clear request list
         */
        i915_gem_retire_requests(dev);

        if (need_display)
                i915_save_display(dev);

        if (IS_I965G(dev) || IS_G4X(dev)) {
                /*
                 * Set the domains we want to reset, then the reset bit (bit 0).
                 * Clear the reset bit after a while and wait for hardware status
                 * bit (bit 1) to be set
                 */
                pci_read_config_byte(dev->pdev, GDRST, &gdrst);
                pci_write_config_byte(dev->pdev, GDRST, gdrst | flags | ((flags == GDRST_FULL) ? 0x1 : 0x0));
                udelay(50);
                pci_write_config_byte(dev->pdev, GDRST, gdrst & 0xfe);

                /* ...we don't want to loop forever though, 500ms should be plenty */
               timeout = jiffies + msecs_to_jiffies(500);
                do {
                        udelay(100);
                        pci_read_config_byte(dev->pdev, GDRST, &gdrst);
                } while ((gdrst & 0x1) && time_after(timeout, jiffies));

                if (gdrst & 0x1) {
                        WARN(true, "i915: Failed to reset chip\n");
                        mutex_unlock(&dev->struct_mutex);
                        return -EIO;
                }
        } else {
                DRM_ERROR("Error occurred. Don't know how to reset this chip.\n");
                return -ENODEV;
        }

        /* Ok, now get things going again... */

        /*
         * Everything depends on having the GTT running, so we need to start
         * there.  Fortunately we don't need to do this unless we reset the
         * chip at a PCI level.
         *
         * Next we need to restore the context, but we don't use those
         * yet either...
         *
         * Ring buffer needs to be re-initialized in the KMS case, or if X
         * was running at the time of the reset (i.e. we weren't VT
         * switched away).
         */
        if (drm_core_check_feature(dev, DRIVER_MODESET) ||
            !dev_priv->mm.suspended) {
                drm_i915_ring_buffer_t *ring = &dev_priv->ring;
                struct drm_gem_object *obj = ring->ring_obj;
                struct drm_i915_gem_object *obj_priv = obj->driver_private;
                dev_priv->mm.suspended = 0;

                /* Stop the ring if it's running. */
                I915_WRITE(PRB0_CTL, 0);
                I915_WRITE(PRB0_TAIL, 0);
                I915_WRITE(PRB0_HEAD, 0);

                /* Initialize the ring. */
                I915_WRITE(PRB0_START, obj_priv->gtt_offset);
                I915_WRITE(PRB0_CTL,
                           ((obj->size - 4096) & RING_NR_PAGES) |
                           RING_NO_REPORT |
                           RING_VALID);
                if (!drm_core_check_feature(dev, DRIVER_MODESET))
                        i915_kernel_lost_context(dev);
                else {
                        ring->head = I915_READ(PRB0_HEAD) & HEAD_ADDR;
                        ring->tail = I915_READ(PRB0_TAIL) & TAIL_ADDR;
                        ring->space = ring->head - (ring->tail + 8);
                        if (ring->space < 0)
                                ring->space += ring->Size;
                }

                mutex_unlock(&dev->struct_mutex);
                drm_irq_uninstall(dev);
                drm_irq_install(dev);
                mutex_lock(&dev->struct_mutex);
        }

        /*
         * Display needs restore too...
         */
        if (need_display)
                i915_restore_display(dev);

        mutex_unlock(&dev->struct_mutex);
        return 0;
}


static int __devinit
i915_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
        return drm_get_dev(pdev, ent, &driver);
}

static void
i915_pci_remove(struct pci_dev *pdev)
{
        struct drm_device *dev = pci_get_drvdata(pdev);

        drm_put_dev(dev);
}

static int
i915_pci_suspend(struct pci_dev *pdev, pm_message_t state)
{
        struct drm_device *dev = pci_get_drvdata(pdev);

        return i915_suspend(dev, state);
}

static int
i915_pci_resume(struct pci_dev *pdev)
{
        struct drm_device *dev = pci_get_drvdata(pdev);

        return i915_resume(dev);
}

static struct vm_operations_struct i915_gem_vm_ops = {
        .fault = i915_gem_fault,
        .open = drm_gem_vm_open,
        .close = drm_gem_vm_close,
};

static struct drm_driver driver = {
        /* don't use mtrr's here, the Xserver or user space app should
         * deal with them for intel hardware.
         */
        .driver_features =
            DRIVER_USE_AGP | DRIVER_REQUIRE_AGP | /* DRIVER_USE_MTRR |*/
            DRIVER_HAVE_IRQ | DRIVER_IRQ_SHARED | DRIVER_GEM,
        .load = i915_driver_load,
        .unload = i915_driver_unload,
        .open = i915_driver_open,
        .lastclose = i915_driver_lastclose,
        .preclose = i915_driver_preclose,
        .postclose = i915_driver_postclose,
        .suspend = i915_suspend,
        .resume = i915_resume,
        .device_is_agp = i915_driver_device_is_agp,
        .enable_vblank = i915_enable_vblank,
        .disable_vblank = i915_disable_vblank,
        .irq_preinstall = i915_driver_irq_preinstall,
        .irq_postinstall = i915_driver_irq_postinstall,
        .irq_uninstall = i915_driver_irq_uninstall,
        .irq_handler = i915_driver_irq_handler,
        .reclaim_buffers = drm_core_reclaim_buffers,
        .get_map_ofs = drm_core_get_map_ofs,
        .get_reg_ofs = drm_core_get_reg_ofs,
        .master_create = i915_master_create,
        .master_destroy = i915_master_destroy,
#if defined(CONFIG_DEBUG_FS)
        .debugfs_init = i915_debugfs_init,
        .debugfs_cleanup = i915_debugfs_cleanup,
#endif
        .gem_init_object = i915_gem_init_object,
        .gem_free_object = i915_gem_free_object,
        .gem_vm_ops = &i915_gem_vm_ops,
        .ioctls = i915_ioctls,
        .fops = {
                 .owner = THIS_MODULE,
                 .open = drm_open,
                 .release = drm_release,
                 .ioctl = drm_ioctl,
                 .mmap = drm_gem_mmap,
                 .poll = drm_poll,
                 .fasync = drm_fasync,
#ifdef CONFIG_COMPAT
                 .compat_ioctl = i915_compat_ioctl,
#endif
        },

        .pci_driver = {
                 .name = DRIVER_NAME,
                 .id_table = pciidlist,
                 .probe = i915_pci_probe,
                 .remove = i915_pci_remove,
#ifdef CONFIG_PM
                 .resume = i915_pci_resume,
                 .suspend = i915_pci_suspend,
#endif
        },

        .name = DRIVER_NAME,
        .desc = DRIVER_DESC,
        .date = DRIVER_DATE,
        .major = DRIVER_MAJOR,
        .minor = DRIVER_MINOR,
        .patchlevel = DRIVER_PATCHLEVEL,
};

static int __init i915_init(void)
{
        driver.num_ioctls = i915_max_ioctl;

        i915_gem_shrinker_init();

        /*
         * If CONFIG_DRM_I915_KMS is set, default to KMS unless
         * explicitly disabled with the module pararmeter.
         *
         * Otherwise, just follow the parameter (defaulting to off).
         *
         * Allow optional vga_text_mode_force boot option to override
         * the default behavior.
         */
#if defined(CONFIG_DRM_I915_KMS)
        if (i915_modeset != 0)
                driver.driver_features |= DRIVER_MODESET;
#endif
        if (i915_modeset == 1)
                driver.driver_features |= DRIVER_MODESET;

#ifdef CONFIG_VGA_CONSOLE
        if (vgacon_text_force() && i915_modeset == -1)
                driver.driver_features &= ~DRIVER_MODESET;
#endif

        return drm_init(&driver);
}

static void __exit i915_exit(void)
{
        i915_gem_shrinker_exit();
        drm_exit(&driver);
}

module_init(i915_init);
module_exit(i915_exit);

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL and additional rights");