reactos/drivers/usb/cromwell/usbohci/ohci-mem.c

   1 /*
   2  * OHCI HCD (Host Controller Driver) for USB.
   3  *
   4  * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
   5  * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
   6  *
   7  * This file is licenced under the GPL.
   8  */
   9
  10 /*-------------------------------------------------------------------------*/
  11
  12 /*
  13  * There's basically three types of memory:
  14  *      - data used only by the HCD ... kmalloc is fine
  15  *      - async and periodic schedules, shared by HC and HCD ... these
  16  *        need to use pci_pool or pci_alloc_consistent
  17  *      - driver buffers, read/written by HC ... the hcd glue or the
  18  *        device driver provides us with dma addresses
  19  *
  20  * There's also PCI "register" data, which is memory mapped.
  21  * No memory seen by this driver is pagable.
  22  */
  23
  24 /*-------------------------------------------------------------------------*/
  25
  26 static struct usb_hcd *ohci_hcd_alloc (void)
  27 {
  28         struct ohci_hcd *ohci;
  29
  30         ohci = (struct ohci_hcd *) kmalloc (sizeof *ohci, GFP_KERNEL);
  31         if (ohci != 0) {
  32                 memset (ohci, 0, sizeof (struct ohci_hcd));
  33                 return &ohci->hcd;
  34         }
  35         return 0;
  36 }
  37
  38 static void ohci_hcd_free (struct usb_hcd *hcd)
  39 {
  40         kfree (hcd_to_ohci (hcd));
  41 }
  42
  43 /*-------------------------------------------------------------------------*/
  44
  45 static int ohci_mem_init (struct ohci_hcd *ohci)
  46 {
  47         ohci->td_cache = pci_pool_create ("ohci_td", ohci->hcd.pdev,
  48                 sizeof (struct td),
  49                 32 /* byte alignment */,
  50                 0 /* no page-crossing issues */);
  51         if (!ohci->td_cache)
  52                 return -ENOMEM;
  53         ohci->ed_cache = pci_pool_create ("ohci_ed", ohci->hcd.pdev,
  54                 sizeof (struct ed),
  55                 16 /* byte alignment */,
  56                 0 /* no page-crossing issues */);
  57         if (!ohci->ed_cache) {
  58                 pci_pool_destroy (ohci->td_cache);
  59                 return -ENOMEM;
  60         }
  61         return 0;
  62 }
  63
  64 static void ohci_mem_cleanup (struct ohci_hcd *ohci)
  65 {
  66         if (ohci->td_cache) {
  67                 pci_pool_destroy (ohci->td_cache);
  68                 ohci->td_cache = 0;
  69         }
  70         if (ohci->ed_cache) {
  71                 pci_pool_destroy (ohci->ed_cache);
  72                 ohci->ed_cache = 0;
  73         }
  74 }
  75
  76 /*-------------------------------------------------------------------------*/
  77
  78 /* ohci "done list" processing needs this mapping */
  79 static inline struct td *
  80 dma_to_td (struct ohci_hcd *hc, dma_addr_t td_dma)
  81 {
  82         struct td *td;
  83
  84         td_dma &= TD_MASK;
  85         td = hc->td_hash [TD_HASH_FUNC(td_dma)];
  86         while (td && td->td_dma != td_dma)
  87                 td = td->td_hash;
  88         return td;
  89 }
  90
  91 /* TDs ... */
  92 static struct td *
  93 td_alloc (struct ohci_hcd *hc, int mem_flags)
  94 {
  95         dma_addr_t      dma;
  96         struct td       *td;
  97
  98         td = pci_pool_alloc (hc->td_cache, mem_flags, &dma);
  99         if (td) {
 100                 /* in case hc fetches it, make it look dead */
 101                 memset (td, 0, sizeof *td);
 102                 td->hwNextTD = cpu_to_le32 (dma);
 103                 td->td_dma = dma;
 104                 /* hashed in td_fill */
 105         }
 106         return td;
 107 }
 108
 109 static void
 110 td_free (struct ohci_hcd *hc, struct td *td)
 111 {
 112         struct td       **prev = &hc->td_hash [TD_HASH_FUNC (td->td_dma)];
 113
 114         while (*prev && *prev != td)
 115                 prev = &(*prev)->td_hash;
 116         if (*prev)
 117                 *prev = td->td_hash;
 118         else if ((td->hwINFO & TD_DONE) != 0)
 119                 ohci_dbg (hc, "no hash for td %p\n", td);
 120         pci_pool_free (hc->td_cache, td, td->td_dma);
 121 }
 122
 123 /*-------------------------------------------------------------------------*/
 124
 125 /* EDs ... */
 126 static struct ed *
 127 ed_alloc (struct ohci_hcd *hc, int mem_flags)
 128 {
 129         dma_addr_t      dma;
 130         struct ed       *ed;
 131
 132         ed = pci_pool_alloc (hc->ed_cache, mem_flags, &dma);
 133         if (ed) {
 134                 memset (ed, 0, sizeof (*ed));
 135                 INIT_LIST_HEAD (&ed->td_list);
 136                 ed->dma = dma;
 137         }
 138         return ed;
 139 }
 140
 141 static void
 142 ed_free (struct ohci_hcd *hc, struct ed *ed)
 143 {
 144         pci_pool_free (hc->ed_cache, ed, ed->dma);
 145 }
 146