target/linux/adm5120/files-3.18/drivers/usb/host/adm5120-mem.c

   1 /*
   2  * ADM5120 HCD (Host Controller Driver) for USB
   3  *
   4  * Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
   5  *
   6  * This file was derived from: drivers/usb/host/ohci-mem.c
   7  *   (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
   8  *   (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
   9  *
  10  *  This program is free software; you can redistribute it and/or modify it
  11  *  under the terms of the GNU General Public License version 2 as published
  12  *  by the Free Software Foundation.
  13  *
  14  */
  15
  16 /*-------------------------------------------------------------------------*/
  17
  18 /*
  19  * OHCI deals with three types of memory:
  20  *      - data used only by the HCD ... kmalloc is fine
  21  *      - async and periodic schedules, shared by HC and HCD ... these
  22  *        need to use dma_pool or dma_alloc_coherent
  23  *      - driver buffers, read/written by HC ... the hcd glue or the
  24  *        device driver provides us with dma addresses
  25  *
  26  * There's also "register" data, which is memory mapped.
  27  * No memory seen by this driver (or any HCD) may be paged out.
  28  */
  29
  30 /*-------------------------------------------------------------------------*/
  31
  32 static void admhc_hcd_init(struct admhcd *ahcd)
  33 {
  34         ahcd->next_statechange = jiffies;
  35         spin_lock_init(&ahcd->lock);
  36         INIT_LIST_HEAD(&ahcd->pending);
  37 }
  38
  39 /*-------------------------------------------------------------------------*/
  40
  41 static int admhc_mem_init(struct admhcd *ahcd)
  42 {
  43         ahcd->td_cache = dma_pool_create("admhc_td",
  44                 admhcd_to_hcd(ahcd)->self.controller,
  45                 sizeof(struct td),
  46                 TD_ALIGN, /* byte alignment */
  47                 0 /* no page-crossing issues */
  48                 );
  49         if (!ahcd->td_cache)
  50                 goto err;
  51
  52         ahcd->ed_cache = dma_pool_create("admhc_ed",
  53                 admhcd_to_hcd(ahcd)->self.controller,
  54                 sizeof(struct ed),
  55                 ED_ALIGN, /* byte alignment */
  56                 0 /* no page-crossing issues */
  57                 );
  58         if (!ahcd->ed_cache)
  59                 goto err_td_cache;
  60
  61         return 0;
  62
  63 err_td_cache:
  64         dma_pool_destroy(ahcd->td_cache);
  65         ahcd->td_cache = NULL;
  66 err:
  67         return -ENOMEM;
  68 }
  69
  70 static void admhc_mem_cleanup(struct admhcd *ahcd)
  71 {
  72         if (ahcd->td_cache) {
  73                 dma_pool_destroy(ahcd->td_cache);
  74                 ahcd->td_cache = NULL;
  75         }
  76
  77         if (ahcd->ed_cache) {
  78                 dma_pool_destroy(ahcd->ed_cache);
  79                 ahcd->ed_cache = NULL;
  80         }
  81 }
  82
  83 /*-------------------------------------------------------------------------*/
  84
  85 /* ahcd "done list" processing needs this mapping */
  86 static inline struct td *dma_to_td(struct admhcd *ahcd, dma_addr_t td_dma)
  87 {
  88         struct td *td;
  89
  90         td_dma &= TD_MASK;
  91         td = ahcd->td_hash[TD_HASH_FUNC(td_dma)];
  92         while (td && td->td_dma != td_dma)
  93                 td = td->td_hash;
  94
  95         return td;
  96 }
  97
  98 /* TDs ... */
  99 static struct td *td_alloc(struct admhcd *ahcd, gfp_t mem_flags)
 100 {
 101         dma_addr_t      dma;
 102         struct td       *td;
 103
 104         td = dma_pool_alloc(ahcd->td_cache, mem_flags, &dma);
 105         if (!td)
 106                 return NULL;
 107
 108         /* in case ahcd fetches it, make it look dead */
 109         memset(td, 0, sizeof *td);
 110         td->hwNextTD = cpu_to_hc32(ahcd, dma);
 111         td->td_dma = dma;
 112         /* hashed in td_fill */
 113
 114         return td;
 115 }
 116
 117 static void td_free(struct admhcd *ahcd, struct td *td)
 118 {
 119         struct td **prev = &ahcd->td_hash[TD_HASH_FUNC(td->td_dma)];
 120
 121         while (*prev && *prev != td)
 122                 prev = &(*prev)->td_hash;
 123         if (*prev)
 124                 *prev = td->td_hash;
 125 #if 0
 126         /* TODO: remove */
 127         else if ((td->hwINFO & cpu_to_hc32(ahcd, TD_DONE)) != 0)
 128                 admhc_dbg(ahcd, "no hash for td %p\n", td);
 129 #else
 130         else if ((td->flags & TD_FLAG_DONE) != 0)
 131                 admhc_dbg(ahcd, "no hash for td %p\n", td);
 132 #endif
 133         dma_pool_free(ahcd->td_cache, td, td->td_dma);
 134 }
 135
 136 /*-------------------------------------------------------------------------*/
 137
 138 /* EDs ... */
 139 static struct ed *ed_alloc(struct admhcd *ahcd, gfp_t mem_flags)
 140 {
 141         dma_addr_t      dma;
 142         struct ed       *ed;
 143
 144         ed = dma_pool_alloc(ahcd->ed_cache, mem_flags, &dma);
 145         if (!ed)
 146                 return NULL;
 147
 148         memset(ed, 0, sizeof(*ed));
 149         ed->dma = dma;
 150
 151         INIT_LIST_HEAD(&ed->td_list);
 152         INIT_LIST_HEAD(&ed->urb_list);
 153
 154         return ed;
 155 }
 156
 157 static void ed_free(struct admhcd *ahcd, struct ed *ed)
 158 {
 159         dma_pool_free(ahcd->ed_cache, ed, ed->dma);
 160 }
 161
 162 /*-------------------------------------------------------------------------*/
 163
 164 /* URB priv ... */
 165 static void urb_priv_free(struct admhcd *ahcd, struct urb_priv *urb_priv)
 166 {
 167         int i;
 168
 169         for (i = 0; i < urb_priv->td_cnt; i++)
 170                 if (urb_priv->td[i])
 171                         td_free(ahcd, urb_priv->td[i]);
 172
 173         list_del(&urb_priv->pending);
 174         kfree(urb_priv);
 175 }
 176
 177 static struct urb_priv *urb_priv_alloc(struct admhcd *ahcd, int num_tds,
 178                 gfp_t mem_flags)
 179 {
 180         struct urb_priv *priv;
 181
 182         /* allocate the private part of the URB */
 183         priv = kzalloc(sizeof(*priv) + sizeof(struct td) * num_tds, mem_flags);
 184         if (!priv)
 185                 goto err;
 186
 187         /* allocate the TDs (deferring hash chain updates) */
 188         for (priv->td_cnt = 0; priv->td_cnt < num_tds; priv->td_cnt++) {
 189                 priv->td[priv->td_cnt] = td_alloc(ahcd, mem_flags);
 190                 if (priv->td[priv->td_cnt] == NULL)
 191                         goto err_free;
 192         }
 193
 194         INIT_LIST_HEAD(&priv->pending);
 195
 196         return priv;
 197
 198 err_free:
 199         urb_priv_free(ahcd, priv);
 200 err:
 201         return NULL;
 202 }