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ohci-mem.c

/*
 * OHCI HCD (Host Controller Driver) for USB.
 * 
 * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
 * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
 * 
 * This file is licenced under the GPL.
 */

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

/*
 * 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 ... the hcd glue or the
 *      device driver provides us with dma addresses
 *
 * There's also PCI "register" data, which is memory mapped.
 * No memory seen by this driver is pagable.
 */

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

static struct usb_hcd *ohci_hcd_alloc (void)
{
      struct ohci_hcd *ohci;

      ohci = (struct ohci_hcd *) kmalloc (sizeof *ohci, GFP_KERNEL);
      if (ohci != 0) {
            memset (ohci, 0, sizeof (struct ohci_hcd));
            return &ohci->hcd;
      }
      return 0;
}

static void ohci_hcd_free (struct usb_hcd *hcd)
{
      kfree (hcd_to_ohci (hcd));
}

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

static int ohci_mem_init (struct ohci_hcd *ohci)
{
      ohci->td_cache = pci_pool_create ("ohci_td", ohci->hcd.pdev,
            sizeof (struct td),
            32 /* byte alignment */,
            0 /* no page-crossing issues */);
      if (!ohci->td_cache)
            return -ENOMEM;
      ohci->ed_cache = pci_pool_create ("ohci_ed", ohci->hcd.pdev,
            sizeof (struct ed),
            16 /* byte alignment */,
            0 /* no page-crossing issues */);
      if (!ohci->ed_cache) {
            pci_pool_destroy (ohci->td_cache);
            return -ENOMEM;
      }
      return 0;
}

static void ohci_mem_cleanup (struct ohci_hcd *ohci)
{
      if (ohci->td_cache) {
            pci_pool_destroy (ohci->td_cache);
            ohci->td_cache = 0;
      }
      if (ohci->ed_cache) {
            pci_pool_destroy (ohci->ed_cache);
            ohci->ed_cache = 0;
      }
}

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

/* ohci "done list" processing needs this mapping */
static inline struct td *
dma_to_td (struct ohci_hcd *hc, dma_addr_t td_dma)
{
      struct td *td;

      td_dma &= TD_MASK;
      td = hc->td_hash [TD_HASH_FUNC(td_dma)];
      while (td && td->td_dma != td_dma)
            td = td->td_hash;
      return td;
}

/* TDs ... */
static struct td *
td_alloc (struct ohci_hcd *hc, int mem_flags)
{
      dma_addr_t  dma;
      struct td   *td;

      td = pci_pool_alloc (hc->td_cache, mem_flags, &dma);
      if (td) {
            /* in case hc fetches it, make it look dead */
            memset (td, 0, sizeof *td);
            td->hwNextTD = cpu_to_le32 (dma);
            td->td_dma = dma;
            /* hashed in td_fill */
      }
      return td;
}

static void
td_free (struct ohci_hcd *hc, struct td *td)
{
      struct td   **prev = &hc->td_hash [TD_HASH_FUNC (td->td_dma)];

      while (*prev && *prev != td)
            prev = &(*prev)->td_hash;
      if (*prev)
            *prev = td->td_hash;
      else if ((td->hwINFO & TD_DONE) != 0)
            ohci_dbg (hc, "no hash for td %p\n", td);
      pci_pool_free (hc->td_cache, td, td->td_dma);
}

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

/* EDs ... */
static struct ed *
ed_alloc (struct ohci_hcd *hc, int mem_flags)
{
      dma_addr_t  dma;
      struct ed   *ed;

      ed = pci_pool_alloc (hc->ed_cache, mem_flags, &dma);
      if (ed) {
            memset (ed, 0, sizeof (*ed));
            INIT_LIST_HEAD (&ed->td_list);
            ed->dma = dma;
      }
      return ed;
}

static void
ed_free (struct ohci_hcd *hc, struct ed *ed)
{
      pci_pool_free (hc->ed_cache, ed, ed->dma);
}


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