2 * OHCI HCD (Host Controller Driver) for USB.
4 * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
5 * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
7 * This file is licenced under the GPL.
10 /*-------------------------------------------------------------------------*/
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
20 * There's also "register" data, which is memory mapped.
21 * No memory seen by this driver (or any HCD) may be paged out.
24 /*-------------------------------------------------------------------------*/
26 static void admhc_hcd_init(struct admhcd *ahcd)
28 ahcd->next_statechange = jiffies;
29 spin_lock_init(&ahcd->lock);
32 /*-------------------------------------------------------------------------*/
34 static int admhc_mem_init(struct admhcd *ahcd)
36 ahcd->td_cache = dma_pool_create("admhc_td",
37 admhcd_to_hcd(ahcd)->self.controller,
39 TD_ALIGN, /* byte alignment */
40 0 /* no page-crossing issues */
45 ahcd->ed_cache = dma_pool_create("admhc_ed",
46 admhcd_to_hcd(ahcd)->self.controller,
48 ED_ALIGN, /* byte alignment */
49 0 /* no page-crossing issues */
57 dma_pool_destroy(ahcd->td_cache);
58 ahcd->td_cache = NULL;
63 static void admhc_mem_cleanup(struct admhcd *ahcd)
66 dma_pool_destroy(ahcd->td_cache);
67 ahcd->td_cache = NULL;
71 dma_pool_destroy(ahcd->ed_cache);
72 ahcd->ed_cache = NULL;
76 /*-------------------------------------------------------------------------*/
79 static struct td *td_alloc(struct admhcd *ahcd, gfp_t mem_flags)
84 td = dma_pool_alloc(ahcd->td_cache, mem_flags, &dma);
88 /* in case ahcd fetches it, make it look dead */
89 memset(td, 0, sizeof *td);
95 static void td_free(struct admhcd *ahcd, struct td *td)
97 dma_pool_free(ahcd->td_cache, td, td->td_dma);
100 /*-------------------------------------------------------------------------*/
103 static struct ed *ed_alloc(struct admhcd *ahcd, gfp_t mem_flags)
108 ed = dma_pool_alloc(ahcd->ed_cache, mem_flags, &dma);
112 memset(ed, 0, sizeof(*ed));
115 INIT_LIST_HEAD(&ed->urb_pending);
120 static void ed_free(struct admhcd *ahcd, struct ed *ed)
122 dma_pool_free(ahcd->ed_cache, ed, ed->dma);
125 /*-------------------------------------------------------------------------*/
128 static void urb_priv_free(struct admhcd *ahcd, struct urb_priv *urb_priv)
132 for (i = 0; i < urb_priv->td_cnt; i++)
134 td_free(ahcd, urb_priv->td[i]);
139 static struct urb_priv *urb_priv_alloc(struct admhcd *ahcd, int num_tds,
142 struct urb_priv *priv;
145 /* allocate the private part of the URB */
146 priv = kzalloc(sizeof(*priv) + sizeof(struct td) * num_tds, mem_flags);
150 /* allocate the TDs (deferring hash chain updates) */
151 for (i = 0; i < num_tds; i++) {
152 priv->td[i] = td_alloc(ahcd, mem_flags);
153 if (priv->td[i] == NULL)
155 priv->td[i]->index = i;
158 INIT_LIST_HEAD(&priv->pending);
159 priv->td_cnt = num_tds;
164 urb_priv_free(ahcd, priv);