target/linux/adm5120/files/drivers/usb/host/adm5120-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  * OHCI deals with 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 dma_pool or dma_alloc_coherent
  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 "register" data, which is memory mapped.
  21  * No memory seen by this driver (or any HCD) may be paged out.
  22  */
  23
  24 /*-------------------------------------------------------------------------*/
  25
  26 static void admhc_hcd_init(struct admhcd *ahcd)
  27 {
  28         ahcd->next_statechange = jiffies;
  29         spin_lock_init(&ahcd->lock);
  30 }
  31
  32 /*-------------------------------------------------------------------------*/
  33
  34 static int admhc_mem_init(struct admhcd *ahcd)
  35 {
  36         ahcd->td_cache = dma_pool_create("admhc_td",
  37                 admhcd_to_hcd(ahcd)->self.controller,
  38                 sizeof(struct td),
  39                 TD_ALIGN, /* byte alignment */
  40                 0 /* no page-crossing issues */
  41                 );
  42         if (!ahcd->td_cache)
  43                 goto err;
  44
  45         ahcd->ed_cache = dma_pool_create("admhc_ed",
  46                 admhcd_to_hcd(ahcd)->self.controller,
  47                 sizeof(struct ed),
  48                 ED_ALIGN, /* byte alignment */
  49                 0 /* no page-crossing issues */
  50                 );
  51         if (!ahcd->ed_cache)
  52                 goto err_td_cache;
  53
  54         return 0;
  55
  56 err_td_cache:
  57         dma_pool_destroy(ahcd->td_cache);
  58         ahcd->td_cache = NULL;
  59 err:
  60         return -ENOMEM;
  61 }
  62
  63 static void admhc_mem_cleanup(struct admhcd *ahcd)
  64 {
  65         if (ahcd->td_cache) {
  66                 dma_pool_destroy(ahcd->td_cache);
  67                 ahcd->td_cache = NULL;
  68         }
  69
  70         if (ahcd->ed_cache) {
  71                 dma_pool_destroy(ahcd->ed_cache);
  72                 ahcd->ed_cache = NULL;
  73         }
  74 }
  75
  76 /*-------------------------------------------------------------------------*/
  77
  78 /* TDs ... */
  79 static struct td *td_alloc(struct admhcd *ahcd, gfp_t mem_flags)
  80 {
  81         dma_addr_t      dma;
  82         struct td       *td;
  83
  84         td = dma_pool_alloc(ahcd->td_cache, mem_flags, &dma);
  85         if (!td)
  86                 return NULL;
  87
  88         /* in case ahcd fetches it, make it look dead */
  89         memset(td, 0, sizeof *td);
  90         td->td_dma = dma;
  91
  92         return td;
  93 }
  94
  95 static void td_free(struct admhcd *ahcd, struct td *td)
  96 {
  97         dma_pool_free(ahcd->td_cache, td, td->td_dma);
  98 }
  99
 100 /*-------------------------------------------------------------------------*/
 101
 102 /* EDs ... */
 103 static struct ed *ed_alloc(struct admhcd *ahcd, gfp_t mem_flags)
 104 {
 105         dma_addr_t      dma;
 106         struct ed       *ed;
 107
 108         ed = dma_pool_alloc(ahcd->ed_cache, mem_flags, &dma);
 109         if (!ed)
 110                 return NULL;
 111
 112         memset(ed, 0, sizeof(*ed));
 113         ed->dma = dma;
 114
 115         INIT_LIST_HEAD(&ed->urb_pending);
 116
 117         return ed;
 118 }
 119
 120 static void ed_free(struct admhcd *ahcd, struct ed *ed)
 121 {
 122         dma_pool_free(ahcd->ed_cache, ed, ed->dma);
 123 }
 124
 125 /*-------------------------------------------------------------------------*/
 126
 127 /* URB priv ... */
 128 static void urb_priv_free(struct admhcd *ahcd, struct urb_priv *urb_priv)
 129 {
 130         int i;
 131
 132         for (i = 0; i < urb_priv->td_cnt; i++)
 133                 if (urb_priv->td[i])
 134                         td_free(ahcd, urb_priv->td[i]);
 135
 136         kfree(urb_priv);
 137 }
 138
 139 static struct urb_priv *urb_priv_alloc(struct admhcd *ahcd, int num_tds,
 140                 gfp_t mem_flags)
 141 {
 142         struct urb_priv *priv;
 143         int i;
 144
 145         /* allocate the private part of the URB */
 146         priv = kzalloc(sizeof(*priv) + sizeof(struct td) * num_tds, mem_flags);
 147         if (!priv)
 148                 goto err;
 149
 150         /* allocate the TDs */
 151         for (i = 0; i < num_tds; i++) {
 152                 priv->td[i] = td_alloc(ahcd, mem_flags);
 153                 if (priv->td[i] == NULL)
 154                         goto err_free;
 155                 priv->td[i]->index = i;
 156         }
 157
 158         INIT_LIST_HEAD(&priv->pending);
 159         priv->td_cnt = num_tds;
 160
 161         return priv;
 162
 163 err_free:
 164         urb_priv_free(ahcd, priv);
 165 err:
 166         return NULL;
 167 }