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);
30 INIT_LIST_HEAD(&ahcd->pending);
33 /*-------------------------------------------------------------------------*/
35 static int admhc_mem_init(struct admhcd *ahcd)
37 ahcd->td_cache = dma_pool_create("admhc_td",
38 admhcd_to_hcd(ahcd)->self.controller,
40 TD_ALIGN, /* byte alignment */
41 0 /* no page-crossing issues */
46 ahcd->ed_cache = dma_pool_create("admhc_ed",
47 admhcd_to_hcd(ahcd)->self.controller,
49 ED_ALIGN, /* byte alignment */
50 0 /* no page-crossing issues */
58 dma_pool_destroy(ahcd->td_cache);
59 ahcd->td_cache = NULL;
64 static void admhc_mem_cleanup(struct admhcd *ahcd)
67 dma_pool_destroy(ahcd->td_cache);
68 ahcd->td_cache = NULL;
72 dma_pool_destroy(ahcd->ed_cache);
73 ahcd->ed_cache = NULL;
77 /*-------------------------------------------------------------------------*/
79 /* ahcd "done list" processing needs this mapping */
80 static inline struct td *dma_to_td(struct admhcd *ahcd, dma_addr_t td_dma)
85 td = ahcd->td_hash[TD_HASH_FUNC(td_dma)];
86 while (td && td->td_dma != td_dma)
93 static struct td *td_alloc(struct admhcd *ahcd, gfp_t mem_flags)
98 td = dma_pool_alloc(ahcd->td_cache, mem_flags, &dma);
102 /* in case ahcd fetches it, make it look dead */
103 memset(td, 0, sizeof *td);
104 td->hwNextTD = cpu_to_hc32(ahcd, dma);
106 /* hashed in td_fill */
111 static void td_free(struct admhcd *ahcd, struct td *td)
113 struct td **prev = &ahcd->td_hash[TD_HASH_FUNC(td->td_dma)];
115 while (*prev && *prev != td)
116 prev = &(*prev)->td_hash;
121 else if ((td->hwINFO & cpu_to_hc32(ahcd, TD_DONE)) != 0)
122 admhc_dbg (ahcd, "no hash for td %p\n", td);
124 else if ((td->flags & TD_FLAG_DONE) != 0)
125 admhc_dbg (ahcd, "no hash for td %p\n", td);
127 dma_pool_free(ahcd->td_cache, td, td->td_dma);
130 /*-------------------------------------------------------------------------*/
133 static struct ed *ed_alloc(struct admhcd *ahcd, gfp_t mem_flags)
138 ed = dma_pool_alloc(ahcd->ed_cache, mem_flags, &dma);
142 memset(ed, 0, sizeof(*ed));
145 INIT_LIST_HEAD(&ed->td_list);
146 INIT_LIST_HEAD(&ed->urb_list);
151 static void ed_free(struct admhcd *ahcd, struct ed *ed)
153 dma_pool_free(ahcd->ed_cache, ed, ed->dma);
156 /*-------------------------------------------------------------------------*/
159 static void urb_priv_free(struct admhcd *ahcd, struct urb_priv *urb_priv)
163 for (i = 0; i < urb_priv->td_cnt; i++)
165 td_free(ahcd, urb_priv->td[i]);
167 list_del(&urb_priv->pending);
171 static struct urb_priv *urb_priv_alloc(struct admhcd *ahcd, int num_tds,
174 struct urb_priv *priv;
176 /* allocate the private part of the URB */
177 priv = kzalloc(sizeof(*priv) + sizeof(struct td) * num_tds, mem_flags);
181 /* allocate the TDs (deferring hash chain updates) */
182 for (priv->td_cnt = 0; priv->td_cnt < num_tds; priv->td_cnt++) {
183 priv->td[priv->td_cnt] = td_alloc(ahcd, mem_flags);
184 if (priv->td[priv->td_cnt] == NULL)
188 INIT_LIST_HEAD(&priv->pending);
193 urb_priv_free(ahcd, priv);