drivers/usb/host/ehci-mem.c

   1 /*
   2  * Copyright (c) 2001 by David Brownell
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License as published by the
   6  * Free Software Foundation; either version 2 of the License, or (at your
   7  * option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  11  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software Foundation,
  16  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17  */
  18
  19 /* this file is part of ehci-hcd.c */
  20
  21 /*-------------------------------------------------------------------------*/
  22
  23 /*
  24  * There's basically three types of memory:
  25  *      - data used only by the HCD ... kmalloc is fine
  26  *      - async and periodic schedules, shared by HC and HCD ... these
  27  *        need to use dma_pool or dma_alloc_coherent
  28  *      - driver buffers, read/written by HC ... single shot DMA mapped
  29  *
  30  * There's also PCI "register" data, which is memory mapped.
  31  * No memory seen by this driver is pageable.
  32  */
  33
  34 /*-------------------------------------------------------------------------*/
  35
  36 /* Allocate the key transfer structures from the previously allocated pool */
  37
  38 static inline void ehci_qtd_init (struct ehci_qtd *qtd, dma_addr_t dma)
  39 {
  40         memset (qtd, 0, sizeof *qtd);
  41         qtd->qtd_dma = dma;
  42         qtd->hw_token = cpu_to_le32 (QTD_STS_HALT);
  43         qtd->hw_next = EHCI_LIST_END;
  44         qtd->hw_alt_next = EHCI_LIST_END;
  45         INIT_LIST_HEAD (&qtd->qtd_list);
  46 }
  47
  48 static struct ehci_qtd *ehci_qtd_alloc (struct ehci_hcd *ehci, int flags)
  49 {
  50         struct ehci_qtd         *qtd;
  51         dma_addr_t              dma;
  52
  53         qtd = dma_pool_alloc (ehci->qtd_pool, flags, &dma);
  54         if (qtd != NULL) {
  55                 ehci_qtd_init (qtd, dma);
  56         }
  57         return qtd;
  58 }
  59
  60 static inline void ehci_qtd_free (struct ehci_hcd *ehci, struct ehci_qtd *qtd)
  61 {
  62         dma_pool_free (ehci->qtd_pool, qtd, qtd->qtd_dma);
  63 }
  64
  65
  66 static void qh_destroy (struct kref *kref)
  67 {
  68         struct ehci_qh *qh = container_of(kref, struct ehci_qh, kref);
  69         struct ehci_hcd *ehci = qh->ehci;
  70
  71         /* clean qtds first, and know this is not linked */
  72         if (!list_empty (&qh->qtd_list) || qh->qh_next.ptr) {
  73                 ehci_dbg (ehci, "unused qh not empty!\n");
  74                 BUG ();
  75         }
  76         if (qh->dummy)
  77                 ehci_qtd_free (ehci, qh->dummy);
  78         usb_put_dev (qh->dev);
  79         dma_pool_free (ehci->qh_pool, qh, qh->qh_dma);
  80 }
  81
  82 static struct ehci_qh *ehci_qh_alloc (struct ehci_hcd *ehci, int flags)
  83 {
  84         struct ehci_qh          *qh;
  85         dma_addr_t              dma;
  86
  87         qh = (struct ehci_qh *)
  88                 dma_pool_alloc (ehci->qh_pool, flags, &dma);
  89         if (!qh)
  90                 return qh;
  91
  92         memset (qh, 0, sizeof *qh);
  93         kref_init(&qh->kref);
  94         qh->ehci = ehci;
  95         qh->qh_dma = dma;
  96         // INIT_LIST_HEAD (&qh->qh_list);
  97         INIT_LIST_HEAD (&qh->qtd_list);
  98
  99         /* dummy td enables safe urb queuing */
 100         qh->dummy = ehci_qtd_alloc (ehci, flags);
 101         if (qh->dummy == NULL) {
 102                 ehci_dbg (ehci, "no dummy td\n");
 103                 dma_pool_free (ehci->qh_pool, qh, qh->qh_dma);
 104                 qh = NULL;
 105         }
 106         return qh;
 107 }
 108
 109 /* to share a qh (cpu threads, or hc) */
 110 static inline struct ehci_qh *qh_get (struct ehci_qh *qh)
 111 {
 112         kref_get(&qh->kref);
 113         return qh;
 114 }
 115
 116 static inline void qh_put (struct ehci_qh *qh)
 117 {
 118         kref_put(&qh->kref, qh_destroy);
 119 }
 120
 121 /*-------------------------------------------------------------------------*/
 122
 123 /* The queue heads and transfer descriptors are managed from pools tied
 124  * to each of the "per device" structures.
 125  * This is the initialisation and cleanup code.
 126  */
 127
 128 static void ehci_mem_cleanup (struct ehci_hcd *ehci)
 129 {
 130         if (ehci->async)
 131                 qh_put (ehci->async);
 132         ehci->async = NULL;
 133
 134         /* DMA consistent memory and pools */
 135         if (ehci->qtd_pool)
 136                 dma_pool_destroy (ehci->qtd_pool);
 137         ehci->qtd_pool = NULL;
 138
 139         if (ehci->qh_pool) {
 140                 dma_pool_destroy (ehci->qh_pool);
 141                 ehci->qh_pool = NULL;
 142         }
 143
 144         if (ehci->itd_pool)
 145                 dma_pool_destroy (ehci->itd_pool);
 146         ehci->itd_pool = NULL;
 147
 148         if (ehci->sitd_pool)
 149                 dma_pool_destroy (ehci->sitd_pool);
 150         ehci->sitd_pool = NULL;
 151
 152         if (ehci->periodic)
 153                 dma_free_coherent (ehci_to_hcd(ehci)->self.controller,
 154                         ehci->periodic_size * sizeof (u32),
 155                         ehci->periodic, ehci->periodic_dma);
 156         ehci->periodic = NULL;
 157
 158         /* shadow periodic table */
 159         kfree(ehci->pshadow);
 160         ehci->pshadow = NULL;
 161 }
 162
 163 /* remember to add cleanup code (above) if you add anything here */
 164 static int ehci_mem_init (struct ehci_hcd *ehci, int flags)
 165 {
 166         int i;
 167
 168         /* QTDs for control/bulk/intr transfers */
 169         ehci->qtd_pool = dma_pool_create ("ehci_qtd",
 170                         ehci_to_hcd(ehci)->self.controller,
 171                         sizeof (struct ehci_qtd),
 172                         32 /* byte alignment (for hw parts) */,
 173                         4096 /* can't cross 4K */);
 174         if (!ehci->qtd_pool) {
 175                 goto fail;
 176         }
 177
 178         /* QHs for control/bulk/intr transfers */
 179         ehci->qh_pool = dma_pool_create ("ehci_qh",
 180                         ehci_to_hcd(ehci)->self.controller,
 181                         sizeof (struct ehci_qh),
 182                         32 /* byte alignment (for hw parts) */,
 183                         4096 /* can't cross 4K */);
 184         if (!ehci->qh_pool) {
 185                 goto fail;
 186         }
 187         ehci->async = ehci_qh_alloc (ehci, flags);
 188         if (!ehci->async) {
 189                 goto fail;
 190         }
 191
 192         /* ITD for high speed ISO transfers */
 193         ehci->itd_pool = dma_pool_create ("ehci_itd",
 194                         ehci_to_hcd(ehci)->self.controller,
 195                         sizeof (struct ehci_itd),
 196                         32 /* byte alignment (for hw parts) */,
 197                         4096 /* can't cross 4K */);
 198         if (!ehci->itd_pool) {
 199                 goto fail;
 200         }
 201
 202         /* SITD for full/low speed split ISO transfers */
 203         ehci->sitd_pool = dma_pool_create ("ehci_sitd",
 204                         ehci_to_hcd(ehci)->self.controller,
 205                         sizeof (struct ehci_sitd),
 206                         32 /* byte alignment (for hw parts) */,
 207                         4096 /* can't cross 4K */);
 208         if (!ehci->sitd_pool) {
 209                 goto fail;
 210         }
 211
 212         /* Hardware periodic table */
 213         ehci->periodic = (__le32 *)
 214                 dma_alloc_coherent (ehci_to_hcd(ehci)->self.controller,
 215                         ehci->periodic_size * sizeof(__le32),
 216                         &ehci->periodic_dma, 0);
 217         if (ehci->periodic == NULL) {
 218                 goto fail;
 219         }
 220         for (i = 0; i < ehci->periodic_size; i++)
 221                 ehci->periodic [i] = EHCI_LIST_END;
 222
 223         /* software shadow of hardware table */
 224         ehci->pshadow = kmalloc (ehci->periodic_size * sizeof (void *), flags);
 225         if (ehci->pshadow == NULL) {
 226                 goto fail;
 227         }
 228         memset (ehci->pshadow, 0, ehci->periodic_size * sizeof (void *));
 229
 230         return 0;
 231
 232 fail:
 233         ehci_dbg (ehci, "couldn't init memory\n");
 234         ehci_mem_cleanup (ehci);
 235         return -ENOMEM;
 236 }