1 #if 0
2 
3 /*
4  * OHCI HCD (Host Controller Driver) for USB.
5  *
6  * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
7  * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
8  *
9  * This file is licenced under the GPL.
10  */
11 
12 /*-------------------------------------------------------------------------*/
13 
14 /*
15  * OHCI deals with three types of memory:
16  *  - data used only by the HCD ... kmalloc is fine
17  *  - async and periodic schedules, shared by HC and HCD ... these
18  *    need to use dma_pool or dma_alloc_coherent
19  *  - driver buffers, read/written by HC ... the hcd glue or the
20  *    device driver provides us with dma addresses
21  *
22  * There's also "register" data, which is memory mapped.
23  * No memory seen by this driver (or any HCD) may be paged out.
24  */
25 
26 /*-------------------------------------------------------------------------*/
27 
28 static void ohci_hcd_init (struct ohci_hcd *ohci)
29 {
30     ohci->next_statechange = jiffies;
31     spin_lock_init (&ohci->lock);
32     INIT_LIST_HEAD (&ohci->pending);
33     INIT_LIST_HEAD(&ohci->eds_in_use);
34 }
35 
36 /*-------------------------------------------------------------------------*/
37 
38 static int ohci_mem_init (struct ohci_hcd *ohci)
39 {
40     ohci->td_cache = dma_pool_create ("ohci_td",
41         ohci_to_hcd(ohci)->self.controller,
42         sizeof (struct td),
43         32 /* byte alignment */,
44         0 /* no page-crossing issues */);
45     if (!ohci->td_cache)
46         return -ENOMEM;
47     ohci->ed_cache = dma_pool_create ("ohci_ed",
48         ohci_to_hcd(ohci)->self.controller,
49         sizeof (struct ed),
50         16 /* byte alignment */,
51         0 /* no page-crossing issues */);
52     if (!ohci->ed_cache) {
53         dma_pool_destroy (ohci->td_cache);
54         return -ENOMEM;
55     }
56     return 0;
57 }
58 
59 static void ohci_mem_cleanup (struct ohci_hcd *ohci)
60 {
61     if (ohci->td_cache) {
62         dma_pool_destroy (ohci->td_cache);
63         ohci->td_cache = NULL;
64     }
65     if (ohci->ed_cache) {
66         dma_pool_destroy (ohci->ed_cache);
67         ohci->ed_cache = NULL;
68     }
69 }
70 
71 /*-------------------------------------------------------------------------*/
72 
73 /* ohci "done list" processing needs this mapping */
74 static inline struct td *
75 dma_to_td (struct ohci_hcd *hc, dma_addr_t td_dma)
76 {
77     struct td *td;
78 
79     td_dma &= TD_MASK;
80     td = hc->td_hash [TD_HASH_FUNC(td_dma)];
81     while (td && td->td_dma != td_dma)
82         td = td->td_hash;
83     return td;
84 }
85 
86 /* TDs ... */
87 static struct td *
88 td_alloc (struct ohci_hcd *hc, gfp_t mem_flags)
89 {
90     dma_addr_t  dma;
91     struct td   *td;
92 
93     td = dma_pool_alloc (hc->td_cache, mem_flags, &dma);
94     if (td) {
95         /* in case hc fetches it, make it look dead */
96         memset (td, 0, sizeof *td);
97         td->hwNextTD = cpu_to_hc32 (hc, dma);
98         td->td_dma = dma;
99         /* hashed in td_fill */
100     }
101     return td;
102 }
103 
104 static void
105 td_free (struct ohci_hcd *hc, struct td *td)
106 {
107     struct td   **prev = &hc->td_hash [TD_HASH_FUNC (td->td_dma)];
108 
109     while (*prev && *prev != td)
110         prev = &(*prev)->td_hash;
111     if (*prev)
112         *prev = td->td_hash;
113     else if ((td->hwINFO & cpu_to_hc32(hc, TD_DONE)) != 0)
114         ohci_dbg (hc, "no hash for td %p\n", td);
115     dma_pool_free (hc->td_cache, td, td->td_dma);
116 }
117 
118 /*-------------------------------------------------------------------------*/
119 
120 /* EDs ... */
121 static struct ed *
122 ed_alloc (struct ohci_hcd *hc, gfp_t mem_flags)
123 {
124     dma_addr_t  dma;
125     struct ed   *ed;
126 
127     ed = dma_pool_alloc (hc->ed_cache, mem_flags, &dma);
128     if (ed) {
129         memset (ed, 0, sizeof (*ed));
130         INIT_LIST_HEAD (&ed->td_list);
131         ed->dma = dma;
132     }
133     return ed;
134 }
135 
136 static void
137 ed_free (struct ohci_hcd *hc, struct ed *ed)
138 {
139     dma_pool_free (hc->ed_cache, ed, ed->dma);
140 }
141 
142 #endif
143