/*
 * drv_interface.c
 *
 * DSP-BIOS Bridge driver support functions for TI OMAP processors.
 *
 * DSP/BIOS Bridge driver interface.
 *
 * Copyright (C) 2005-2006 Texas Instruments, Inc.
 *
 * This package is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#include <linux/platform_data/dsp-omap.h>

#include <linux/types.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/moduleparam.h>
#include <linux/cdev.h>

/*  ----------------------------------- DSP/BIOS Bridge */
#include <dspbridge/dbdefs.h>

/*  ----------------------------------- OS Adaptation Layer */
#include <dspbridge/clk.h>

/*  ----------------------------------- Platform Manager */
#include <dspbridge/dspapi.h>
#include <dspbridge/dspdrv.h>

/*  ----------------------------------- Resource Manager */
#include <dspbridge/pwr.h>

#include <dspbridge/resourcecleanup.h>
#include <dspbridge/proc.h>
#include <dspbridge/dev.h>

#ifdef CONFIG_TIDSPBRIDGE_DVFS
#include <mach-omap2/omap3-opp.h>
#endif

/*  ----------------------------------- Globals */
#define DSPBRIDGE_VERSION	"0.3"
s32 dsp_debug;

struct platform_device *omap_dspbridge_dev;
struct device *bridge;

/* This is a test variable used by Bridge to test different sleep states */
s32 dsp_test_sleepstate;

static struct cdev bridge_cdev;

static struct class *bridge_class;

static u32 driver_context;
static s32 driver_major;
static char *base_img;
static s32 shm_size = 0x500000;	/* 5 MB */
static int tc_wordswapon;	/* Default value is always false */
#ifdef CONFIG_TIDSPBRIDGE_RECOVERY
#define REC_TIMEOUT 5000	/*recovery timeout in msecs */
static atomic_t bridge_cref;	/* number of bridge open handles */
static struct workqueue_struct *bridge_rec_queue;
static struct work_struct bridge_recovery_work;
static DECLARE_COMPLETION(bridge_comp);
static DECLARE_COMPLETION(bridge_open_comp);
static bool recover;
#endif

#ifdef CONFIG_PM
struct omap34_xx_bridge_suspend_data {
	int suspended;
	wait_queue_head_t suspend_wq;
};

static struct omap34_xx_bridge_suspend_data bridge_suspend_data;

static int omap34_xxbridge_suspend_lockout(struct omap34_xx_bridge_suspend_data
					   *s, struct file *f)
{
	if ((s)->suspended) {
		if ((f)->f_flags & O_NONBLOCK)
			return -EPERM;
		wait_event_interruptible((s)->suspend_wq, (s)->suspended == 0);
	}
	return 0;
}
#endif

module_param(dsp_debug, int, 0);
MODULE_PARM_DESC(dsp_debug, "Wait after loading DSP image. default = false");

module_param(dsp_test_sleepstate, int, 0);
MODULE_PARM_DESC(dsp_test_sleepstate, "DSP Sleep state = 0");

module_param(base_img, charp, 0);
MODULE_PARM_DESC(base_img, "DSP base image, default = NULL");

module_param(shm_size, int, 0);
MODULE_PARM_DESC(shm_size, "shm size, default = 4 MB, minimum = 64 KB");

module_param(tc_wordswapon, int, 0);
MODULE_PARM_DESC(tc_wordswapon, "TC Word Swap Option. default = 0");

MODULE_AUTHOR("Texas Instruments");
MODULE_LICENSE("GPL");
MODULE_VERSION(DSPBRIDGE_VERSION);

/*
 * This function is called when an application opens handle to the
 * bridge driver.
 */
static int bridge_open(struct inode *ip, struct file *filp)
{
	int status = 0;
	struct process_context *pr_ctxt = NULL;

	/*
	 * Allocate a new process context and insert it into global
	 * process context list.
	 */

#ifdef CONFIG_TIDSPBRIDGE_RECOVERY
	if (recover) {
		if (filp->f_flags & O_NONBLOCK ||
		    wait_for_completion_interruptible(&bridge_open_comp))
			return -EBUSY;
	}
#endif
	pr_ctxt = kzalloc(sizeof(struct process_context), GFP_KERNEL);
	if (!pr_ctxt)
		return -ENOMEM;

	pr_ctxt->res_state = PROC_RES_ALLOCATED;
	spin_lock_init(&pr_ctxt->dmm_map_lock);
	INIT_LIST_HEAD(&pr_ctxt->dmm_map_list);
	spin_lock_init(&pr_ctxt->dmm_rsv_lock);
	INIT_LIST_HEAD(&pr_ctxt->dmm_rsv_list);

	pr_ctxt->node_id = kzalloc(sizeof(struct idr), GFP_KERNEL);
	if (!pr_ctxt->node_id) {
		status = -ENOMEM;
		goto err1;
	}

	idr_init(pr_ctxt->node_id);

	pr_ctxt->stream_id = kzalloc(sizeof(struct idr), GFP_KERNEL);
	if (!pr_ctxt->stream_id) {
		status = -ENOMEM;
		goto err2;
	}

	idr_init(pr_ctxt->stream_id);

	filp->private_data = pr_ctxt;

#ifdef CONFIG_TIDSPBRIDGE_RECOVERY
	atomic_inc(&bridge_cref);
#endif
	return 0;

err2:
	kfree(pr_ctxt->node_id);
err1:
	kfree(pr_ctxt);
	return status;
}

/*
 * This function is called when an application closes handle to the bridge
 * driver.
 */
static int bridge_release(struct inode *ip, struct file *filp)
{
	int status = 0;
	struct process_context *pr_ctxt;

	if (!filp->private_data) {
		status = -EIO;
		goto err;
	}

	pr_ctxt = filp->private_data;
	flush_signals(current);
	drv_remove_all_resources(pr_ctxt);
	proc_detach(pr_ctxt);
	kfree(pr_ctxt->node_id);
	kfree(pr_ctxt->stream_id);
	kfree(pr_ctxt);

	filp->private_data = NULL;

err:
#ifdef CONFIG_TIDSPBRIDGE_RECOVERY
	if (!atomic_dec_return(&bridge_cref))
		complete(&bridge_comp);
#endif
	return status;
}

/* This function provides IO interface to the bridge driver. */
static long bridge_ioctl(struct file *filp, unsigned int code,
			 unsigned long args)
{
	int status;
	u32 retval = 0;
	union trapped_args buf_in;

#ifdef CONFIG_TIDSPBRIDGE_RECOVERY
	if (recover) {
		status = -EIO;
		goto err;
	}
#endif
#ifdef CONFIG_PM
	status = omap34_xxbridge_suspend_lockout(&bridge_suspend_data, filp);
	if (status != 0)
		return status;
#endif

	if (!filp->private_data) {
		status = -EIO;
		goto err;
	}

	status = copy_from_user(&buf_in, (union trapped_args *)args,
				sizeof(union trapped_args));

	if (!status) {
		status = api_call_dev_ioctl(code, &buf_in, &retval,
					    filp->private_data);

		if (!status) {
			status = retval;
		} else {
			dev_dbg(bridge, "%s: IOCTL Failed, code: 0x%x "
				"status 0x%x\n", __func__, code, status);
			status = -1;
		}

	}

err:
	return status;
}

/* This function maps kernel space memory to user space memory. */
static int bridge_mmap(struct file *filp, struct vm_area_struct *vma)
{
	unsigned long base_pgoff;
	int status;
	struct omap_dsp_platform_data *pdata =
					omap_dspbridge_dev->dev.platform_data;

	/* VM_IO | VM_DONTEXPAND | VM_DONTDUMP are set by remap_pfn_range() */
	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);

	dev_dbg(bridge, "%s: vm filp %p start %lx end %lx page_prot %ulx "
		"flags %lx\n", __func__, filp,
		vma->vm_start, vma->vm_end, vma->vm_page_prot,
		vma->vm_flags);

	/*
	 * vm_iomap_memory() expects vma->vm_pgoff to be expressed as an offset
	 * from the start of the physical memory pool, but we're called with
	 * a pfn (physical page number) stored there instead.
	 *
	 * To avoid duplicating lots of tricky overflow checking logic,
	 * temporarily convert vma->vm_pgoff to the offset vm_iomap_memory()
	 * expects, but restore the original value once the mapping has been
	 * created.
	 */
	base_pgoff = pdata->phys_mempool_base >> PAGE_SHIFT;

	if (vma->vm_pgoff < base_pgoff)
		return -EINVAL;

	vma->vm_pgoff -= base_pgoff;

	status = vm_iomap_memory(vma,
				 pdata->phys_mempool_base,
				 pdata->phys_mempool_size);

	/* Restore the original value of vma->vm_pgoff */
	vma->vm_pgoff += base_pgoff;

	return status;
}

static const struct file_operations bridge_fops = {
	.open = bridge_open,
	.release = bridge_release,
	.unlocked_ioctl = bridge_ioctl,
	.mmap = bridge_mmap,
	.llseek = noop_llseek,
};

#ifdef CONFIG_PM
static u32 time_out = 1000;
#ifdef CONFIG_TIDSPBRIDGE_DVFS
s32 dsp_max_opps = VDD1_OPP5;
#endif

/* Maximum Opps that can be requested by IVA */
/*vdd1 rate table */
#ifdef CONFIG_TIDSPBRIDGE_DVFS
const struct omap_opp vdd1_rate_table_bridge[] = {
	{0, 0, 0},
	/*OPP1 */
	{S125M, VDD1_OPP1, 0},
	/*OPP2 */
	{S250M, VDD1_OPP2, 0},
	/*OPP3 */
	{S500M, VDD1_OPP3, 0},
	/*OPP4 */
	{S550M, VDD1_OPP4, 0},
	/*OPP5 */
	{S600M, VDD1_OPP5, 0},
};
#endif
#endif

struct omap_dsp_platform_data *omap_dspbridge_pdata;

u32 vdd1_dsp_freq[6][4] = {
	{0, 0, 0, 0},
	/*OPP1 */
	{0, 90000, 0, 86000},
	/*OPP2 */
	{0, 180000, 80000, 170000},
	/*OPP3 */
	{0, 360000, 160000, 340000},
	/*OPP4 */
	{0, 396000, 325000, 376000},
	/*OPP5 */
	{0, 430000, 355000, 430000},
};

#ifdef CONFIG_TIDSPBRIDGE_RECOVERY
static void bridge_recover(struct work_struct *work)
{
	struct dev_object *dev;
	struct cfg_devnode *dev_node;
	if (atomic_read(&bridge_cref)) {
		reinit_completion(&bridge_comp);
		while (!wait_for_completion_timeout(&bridge_comp,
						msecs_to_jiffies(REC_TIMEOUT)))
			pr_info("%s:%d handle(s) still opened\n",
					__func__, atomic_read(&bridge_cref));
	}
	dev = dev_get_first();
	dev_get_dev_node(dev, &dev_node);
	if (!dev_node || proc_auto_start(dev_node, dev))
		pr_err("DSP could not be restarted\n");
	recover = false;
	complete_all(&bridge_open_comp);
}

void bridge_recover_schedule(void)
{
	reinit_completion(&bridge_open_comp);
	recover = true;
	queue_work(bridge_rec_queue, &bridge_recovery_work);
}
#endif
#ifdef CONFIG_TIDSPBRIDGE_DVFS
static int dspbridge_scale_notification(struct notifier_block *op,
					unsigned long val, void *ptr)
{
	struct omap_dsp_platform_data *pdata =
	    omap_dspbridge_dev->dev.platform_data;

	if (CPUFREQ_POSTCHANGE == val && pdata->dsp_get_opp)
		pwr_pm_post_scale(PRCM_VDD1, pdata->dsp_get_opp());

	return 0;
}

static struct notifier_block iva_clk_notifier = {
	.notifier_call = dspbridge_scale_notification,
	NULL,
};
#endif

/**
 * omap3_bridge_startup() - perform low lever initializations
 * @pdev:      pointer to platform device
 *
 * Initializes recovery, PM and DVFS required data, before calling
 * clk and memory init routines.
 */
static int omap3_bridge_startup(struct platform_device *pdev)
{
	struct omap_dsp_platform_data *pdata = pdev->dev.platform_data;
	struct drv_data *drv_datap = NULL;
	u32 phys_membase, phys_memsize;
	int err;

#ifdef CONFIG_TIDSPBRIDGE_RECOVERY
	bridge_rec_queue = create_workqueue("bridge_rec_queue");
	INIT_WORK(&bridge_recovery_work, bridge_recover);
	reinit_completion(&bridge_comp);
#endif

#ifdef CONFIG_PM
	/* Initialize the wait queue */
	bridge_suspend_data.suspended = 0;
	init_waitqueue_head(&bridge_suspend_data.suspend_wq);

#ifdef CONFIG_TIDSPBRIDGE_DVFS
	for (i = 0; i < 6; i++)
		pdata->mpu_speed[i] = vdd1_rate_table_bridge[i].rate;

	err = cpufreq_register_notifier(&iva_clk_notifier,
					CPUFREQ_TRANSITION_NOTIFIER);
	if (err)
		pr_err("%s: clk_notifier_register failed for iva2_ck\n",
								__func__);
#endif
#endif

	dsp_clk_init();

	drv_datap = kzalloc(sizeof(struct drv_data), GFP_KERNEL);
	if (!drv_datap) {
		err = -ENOMEM;
		goto err1;
	}

	drv_datap->shm_size = shm_size;
	drv_datap->tc_wordswapon = tc_wordswapon;

	if (base_img) {
		drv_datap->base_img = kstrdup(base_img, GFP_KERNEL);
		if (!drv_datap->base_img) {
			err = -ENOMEM;
			goto err2;
		}
	}

	dev_set_drvdata(bridge, drv_datap);

	if (shm_size < 0x10000) {	/* 64 KB */
		err = -EINVAL;
		pr_err("%s: shm size must be at least 64 KB\n", __func__);
		goto err3;
	}
	dev_dbg(bridge, "%s: requested shm_size = 0x%x\n", __func__, shm_size);

	phys_membase = pdata->phys_mempool_base;
	phys_memsize = pdata->phys_mempool_size;
	if (phys_membase > 0 && phys_memsize > 0)
		mem_ext_phys_pool_init(phys_membase, phys_memsize);

	if (tc_wordswapon)
		dev_dbg(bridge, "%s: TC Word Swap is enabled\n", __func__);

	driver_context = dsp_init(&err);
	if (err) {
		pr_err("DSP Bridge driver initialization failed\n");
		goto err4;
	}

	return 0;

err4:
	mem_ext_phys_pool_release();
err3:
	kfree(drv_datap->base_img);
err2:
	kfree(drv_datap);
err1:
#ifdef CONFIG_TIDSPBRIDGE_DVFS
	cpufreq_unregister_notifier(&iva_clk_notifier,
				    CPUFREQ_TRANSITION_NOTIFIER);
#endif
	dsp_clk_exit();

	return err;
}

static int omap34_xx_bridge_probe(struct platform_device *pdev)
{
	int err;
	dev_t dev = 0;
#ifdef CONFIG_TIDSPBRIDGE_DVFS
	int i = 0;
#endif

	omap_dspbridge_dev = pdev;

	/* Global bridge device */
	bridge = &omap_dspbridge_dev->dev;

	/* Bridge low level initializations */
	err = omap3_bridge_startup(pdev);
	if (err)
		goto err1;

	/* use 2.6 device model */
	err = alloc_chrdev_region(&dev, 0, 1, "DspBridge");
	if (err) {
		pr_err("%s: Can't get major %d\n", __func__, driver_major);
		goto err1;
	}

	cdev_init(&bridge_cdev, &bridge_fops);
	bridge_cdev.owner = THIS_MODULE;

	err = cdev_add(&bridge_cdev, dev, 1);
	if (err) {
		pr_err("%s: Failed to add bridge device\n", __func__);
		goto err2;
	}

	/* udev support */
	bridge_class = class_create(THIS_MODULE, "ti_bridge");
	if (IS_ERR(bridge_class)) {
		pr_err("%s: Error creating bridge class\n", __func__);
		err = PTR_ERR(bridge_class);
		goto err3;
	}

	driver_major = MAJOR(dev);
	device_create(bridge_class, NULL, MKDEV(driver_major, 0),
		      NULL, "DspBridge");
	pr_info("DSP Bridge driver loaded\n");

	return 0;

err3:
	cdev_del(&bridge_cdev);
err2:
	unregister_chrdev_region(dev, 1);
err1:
	return err;
}

static int omap34_xx_bridge_remove(struct platform_device *pdev)
{
	dev_t devno;
	int status = 0;
	struct drv_data *drv_datap = dev_get_drvdata(bridge);

	/* Retrieve the Object handle from the driver data */
	if (!drv_datap || !drv_datap->drv_object) {
		status = -ENODATA;
		pr_err("%s: Failed to retrieve the object handle\n", __func__);
		goto func_cont;
	}

#ifdef CONFIG_TIDSPBRIDGE_DVFS
	if (cpufreq_unregister_notifier(&iva_clk_notifier,
					CPUFREQ_TRANSITION_NOTIFIER))
		pr_err("%s: cpufreq_unregister_notifier failed for iva2_ck\n",
		       __func__);
#endif /* #ifdef CONFIG_TIDSPBRIDGE_DVFS */

	if (driver_context) {
		/* Put the DSP in reset state */
		dsp_deinit(driver_context);
		driver_context = 0;
	}

	kfree(drv_datap);
	dev_set_drvdata(bridge, NULL);

func_cont:
	mem_ext_phys_pool_release();

	dsp_clk_exit();

	devno = MKDEV(driver_major, 0);
	cdev_del(&bridge_cdev);
	unregister_chrdev_region(devno, 1);
	if (bridge_class) {
		/* remove the device from sysfs */
		device_destroy(bridge_class, MKDEV(driver_major, 0));
		class_destroy(bridge_class);

	}
	return status;
}

#ifdef CONFIG_PM
static int bridge_suspend(struct platform_device *pdev, pm_message_t state)
{
	u32 status;
	u32 command = PWR_EMERGENCYDEEPSLEEP;

	status = pwr_sleep_dsp(command, time_out);
	if (status)
		return -1;

	bridge_suspend_data.suspended = 1;
	return 0;
}

static int bridge_resume(struct platform_device *pdev)
{
	u32 status;

	status = pwr_wake_dsp(time_out);
	if (status)
		return -1;

	bridge_suspend_data.suspended = 0;
	wake_up(&bridge_suspend_data.suspend_wq);
	return 0;
}
#endif

static struct platform_driver bridge_driver = {
	.driver = {
		   .name = "omap-dsp",
		   },
	.probe = omap34_xx_bridge_probe,
	.remove = omap34_xx_bridge_remove,
#ifdef CONFIG_PM
	.suspend = bridge_suspend,
	.resume = bridge_resume,
#endif
};

/* To remove all process resources before removing the process from the
 * process context list */
int drv_remove_all_resources(void *process_ctxt)
{
	int status = 0;
	struct process_context *ctxt = (struct process_context *)process_ctxt;
	drv_remove_all_strm_res_elements(ctxt);
	drv_remove_all_node_res_elements(ctxt);
	drv_remove_all_dmm_res_elements(ctxt);
	ctxt->res_state = PROC_RES_FREED;
	return status;
}

module_platform_driver(bridge_driver);