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/*
 * Copyright (c) 2001 by David Brownell
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/* this file is part of ehci-hcd.c */

/*-------------------------------------------------------------------------*/

/*
 * There's basically three types of memory:
 *      - data used only by the HCD ... kmalloc is fine
 *      - async and periodic schedules, shared by HC and HCD ... these
 *        need to use pci_pool or pci_alloc_consistent
 *      - driver buffers, read/written by HC ... single shot DMA mapped
 *
 * There's also PCI "register" data, which is memory mapped.
 * No memory seen by this driver is pagable.
 */

/*-------------------------------------------------------------------------*/
/*
 * Allocator / cleanup for the per device structure
 * Called by hcd init / removal code
 */
static struct usb_hcd *ehci_hcd_alloc (void)
{
        struct ehci_hcd *ehci;

        ehci = (struct ehci_hcd *)
                kmalloc (sizeof (struct ehci_hcd), GFP_KERNEL);
        if (ehci != 0) {
                memset (ehci, 0, sizeof (struct ehci_hcd));
                ehci->hcd.product_desc = "EHCI Host Controller";
                return &ehci->hcd;
        }
        return 0;
}

static void ehci_hcd_free (struct usb_hcd *hcd)
{
        kfree (hcd_to_ehci (hcd));
}

/*-------------------------------------------------------------------------*/

/* Allocate the key transfer structures from the previously allocated pool */

static inline void ehci_qtd_init (struct ehci_qtd *qtd, dma_addr_t dma)
{
        memset (qtd, 0, sizeof *qtd);
        qtd->qtd_dma = dma;
        qtd->hw_token = cpu_to_le32 (QTD_STS_HALT);
        qtd->hw_next = EHCI_LIST_END;
        qtd->hw_alt_next = EHCI_LIST_END;
        INIT_LIST_HEAD (&qtd->qtd_list);
}

static struct ehci_qtd *ehci_qtd_alloc (struct ehci_hcd *ehci, int flags)
{
        struct ehci_qtd         *qtd;
        dma_addr_t              dma;

        qtd = pci_pool_alloc (ehci->qtd_pool, flags, &dma);
        if (qtd != 0) {
                ehci_qtd_init (qtd, dma);
        }
        return qtd;
}

static inline void ehci_qtd_free (struct ehci_hcd *ehci, struct ehci_qtd *qtd)
{
        pci_pool_free (ehci->qtd_pool, qtd, qtd->qtd_dma);
}


static struct ehci_qh *ehci_qh_alloc (struct ehci_hcd *ehci, int flags)
{
        struct ehci_qh          *qh;
        dma_addr_t              dma;

        qh = (struct ehci_qh *)
                pci_pool_alloc (ehci->qh_pool, flags, &dma);
        if (!qh)
                return qh;

        memset (qh, 0, sizeof *qh);
        atomic_set (&qh->refcount, 1);
        qh->qh_dma = dma;
        // INIT_LIST_HEAD (&qh->qh_list);
        INIT_LIST_HEAD (&qh->qtd_list);

        /* dummy td enables safe urb queuing */
        qh->dummy = ehci_qtd_alloc (ehci, flags);
        if (qh->dummy == 0) {
                ehci_dbg (ehci, "no dummy td\n");
                pci_pool_free (ehci->qh_pool, qh, qh->qh_dma);
                qh = 0;
        }
        return qh;
}

/* to share a qh (cpu threads, or hc) */
static inline struct ehci_qh *qh_get (/* ehci, */ struct ehci_qh *qh)
{
        atomic_inc (&qh->refcount);
        return qh;
}

static void qh_put (struct ehci_hcd *ehci, struct ehci_qh *qh)
{
        if (!atomic_dec_and_test (&qh->refcount))
                return;
        /* clean qtds first, and know this is not linked */
        if (!list_empty (&qh->qtd_list) || qh->qh_next.ptr) {
                ehci_dbg (ehci, "unused qh not empty!\n");
                BUG ();
        }
        if (qh->dummy)
                ehci_qtd_free (ehci, qh->dummy);
        pci_pool_free (ehci->qh_pool, qh, qh->qh_dma);
}

/*-------------------------------------------------------------------------*/

/* The queue heads and transfer descriptors are managed from pools tied
 * to each of the "per device" structures.
 * This is the initialisation and cleanup code.
 */

static void ehci_mem_cleanup (struct ehci_hcd *ehci)
{
        if (ehci->async)
                qh_put (ehci, ehci->async);
        ehci->async = 0;

        /* PCI consistent memory and pools */
        if (ehci->qtd_pool)
                pci_pool_destroy (ehci->qtd_pool);
        ehci->qtd_pool = 0;

        if (ehci->qh_pool) {
                pci_pool_destroy (ehci->qh_pool);
                ehci->qh_pool = 0;
        }

        if (ehci->itd_pool)
                pci_pool_destroy (ehci->itd_pool);
        ehci->itd_pool = 0;

        if (ehci->sitd_pool)
                pci_pool_destroy (ehci->sitd_pool);
        ehci->sitd_pool = 0;

        if (ehci->periodic)
                pci_free_consistent (ehci->hcd.pdev,
                        ehci->periodic_size * sizeof (u32),
                        ehci->periodic, ehci->periodic_dma);
        ehci->periodic = 0;

        /* shadow periodic table */
        if (ehci->pshadow)
                kfree (ehci->pshadow);
        ehci->pshadow = 0;
}

/* remember to add cleanup code (above) if you add anything here */
static int ehci_mem_init (struct ehci_hcd *ehci, int flags)
{
        int i;

        /* QTDs for control/bulk/intr transfers */
        ehci->qtd_pool = pci_pool_create ("ehci_qtd", ehci->hcd.pdev,
                        sizeof (struct ehci_qtd),
                        32 /* byte alignment (for hw parts) */,
                        4096 /* can't cross 4K */);
        if (!ehci->qtd_pool) {
                goto fail;
        }

        /* QHs for control/bulk/intr transfers */
        ehci->qh_pool = pci_pool_create ("ehci_qh", ehci->hcd.pdev,
                        sizeof (struct ehci_qh),
                        32 /* byte alignment (for hw parts) */,
                        4096 /* can't cross 4K */);
        if (!ehci->qh_pool) {
                goto fail;
        }
        ehci->async = ehci_qh_alloc (ehci, flags);
        if (!ehci->async) {
                goto fail;
        }

        /* ITD for high speed ISO transfers */
        ehci->itd_pool = pci_pool_create ("ehci_itd", ehci->hcd.pdev,
                        sizeof (struct ehci_itd),
                        32 /* byte alignment (for hw parts) */,
                        4096 /* can't cross 4K */);
        if (!ehci->itd_pool) {
                goto fail;
        }

        /* SITD for full/low speed split ISO transfers */
        ehci->sitd_pool = pci_pool_create ("ehci_sitd", ehci->hcd.pdev,
                        sizeof (struct ehci_sitd),
                        32 /* byte alignment (for hw parts) */,
                        4096 /* can't cross 4K */);
        if (!ehci->sitd_pool) {
                goto fail;
        }

        /* Hardware periodic table */
        ehci->periodic = (u32 *)
                pci_alloc_consistent (ehci->hcd.pdev,
                        ehci->periodic_size * sizeof (u32),
                        &ehci->periodic_dma);
        if (ehci->periodic == 0) {
                goto fail;
        }
        for (i = 0; i < ehci->periodic_size; i++)
                ehci->periodic [i] = EHCI_LIST_END;

        /* software shadow of hardware table */
        ehci->pshadow = kmalloc (ehci->periodic_size * sizeof (void *), flags);
        if (ehci->pshadow == 0) {
                goto fail;
        }
        memset (ehci->pshadow, 0, ehci->periodic_size * sizeof (void *));

        return 0;

fail:
        ehci_dbg (ehci, "couldn't init memory\n");
        ehci_mem_cleanup (ehci);
        return -ENOMEM;
}