/*
 * 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/init.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)
{
        u32 status;

        /* 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);

        status = remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
                                 vma->vm_end - vma->vm_start,
                                 vma->vm_page_prot);
        if (status != 0)
                status = -EAGAIN;

        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)) {
                INIT_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)
{
        INIT_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);
        INIT_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 = kmalloc(strlen(base_img) + 1, GFP_KERNEL);
                if (!drv_datap->base_img) {
                        err = -ENOMEM;
                        goto err2;
                }
                strncpy(drv_datap->base_img, base_img, strlen(base_img) + 1);
        }

        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__);
                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 0;
}

#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);