Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * OHCI HCD (Host Controller Driver) for USB. | |
dd9048af | 3 | * |
1da177e4 LT |
4 | * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at> |
5 | * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net> | |
dd9048af | 6 | * |
1da177e4 LT |
7 | * This file is licenced under the GPL. |
8 | */ | |
9 | ||
10 | /*-------------------------------------------------------------------------*/ | |
11 | ||
12 | /* | |
dd9048af | 13 | * OHCI deals with three types of memory: |
1da177e4 LT |
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 | |
19 | * | |
dd9048af DB |
20 | * There's also "register" data, which is memory mapped. |
21 | * No memory seen by this driver (or any HCD) may be paged out. | |
1da177e4 LT |
22 | */ |
23 | ||
24 | /*-------------------------------------------------------------------------*/ | |
25 | ||
26 | static void ohci_hcd_init (struct ohci_hcd *ohci) | |
27 | { | |
28 | ohci->next_statechange = jiffies; | |
29 | spin_lock_init (&ohci->lock); | |
30 | INIT_LIST_HEAD (&ohci->pending); | |
1da177e4 LT |
31 | } |
32 | ||
33 | /*-------------------------------------------------------------------------*/ | |
34 | ||
35 | static int ohci_mem_init (struct ohci_hcd *ohci) | |
36 | { | |
37 | ohci->td_cache = dma_pool_create ("ohci_td", | |
38 | ohci_to_hcd(ohci)->self.controller, | |
39 | sizeof (struct td), | |
40 | 32 /* byte alignment */, | |
41 | 0 /* no page-crossing issues */); | |
42 | if (!ohci->td_cache) | |
43 | return -ENOMEM; | |
44 | ohci->ed_cache = dma_pool_create ("ohci_ed", | |
45 | ohci_to_hcd(ohci)->self.controller, | |
46 | sizeof (struct ed), | |
47 | 16 /* byte alignment */, | |
48 | 0 /* no page-crossing issues */); | |
49 | if (!ohci->ed_cache) { | |
50 | dma_pool_destroy (ohci->td_cache); | |
51 | return -ENOMEM; | |
52 | } | |
53 | return 0; | |
54 | } | |
55 | ||
56 | static void ohci_mem_cleanup (struct ohci_hcd *ohci) | |
57 | { | |
58 | if (ohci->td_cache) { | |
59 | dma_pool_destroy (ohci->td_cache); | |
60 | ohci->td_cache = NULL; | |
61 | } | |
62 | if (ohci->ed_cache) { | |
63 | dma_pool_destroy (ohci->ed_cache); | |
64 | ohci->ed_cache = NULL; | |
65 | } | |
66 | } | |
67 | ||
68 | /*-------------------------------------------------------------------------*/ | |
69 | ||
70 | /* ohci "done list" processing needs this mapping */ | |
71 | static inline struct td * | |
72 | dma_to_td (struct ohci_hcd *hc, dma_addr_t td_dma) | |
73 | { | |
74 | struct td *td; | |
75 | ||
76 | td_dma &= TD_MASK; | |
77 | td = hc->td_hash [TD_HASH_FUNC(td_dma)]; | |
78 | while (td && td->td_dma != td_dma) | |
79 | td = td->td_hash; | |
80 | return td; | |
81 | } | |
82 | ||
83 | /* TDs ... */ | |
84 | static struct td * | |
55016f10 | 85 | td_alloc (struct ohci_hcd *hc, gfp_t mem_flags) |
1da177e4 LT |
86 | { |
87 | dma_addr_t dma; | |
88 | struct td *td; | |
89 | ||
90 | td = dma_pool_alloc (hc->td_cache, mem_flags, &dma); | |
91 | if (td) { | |
92 | /* in case hc fetches it, make it look dead */ | |
93 | memset (td, 0, sizeof *td); | |
94 | td->hwNextTD = cpu_to_hc32 (hc, dma); | |
95 | td->td_dma = dma; | |
96 | /* hashed in td_fill */ | |
97 | } | |
98 | return td; | |
99 | } | |
100 | ||
101 | static void | |
102 | td_free (struct ohci_hcd *hc, struct td *td) | |
103 | { | |
104 | struct td **prev = &hc->td_hash [TD_HASH_FUNC (td->td_dma)]; | |
105 | ||
106 | while (*prev && *prev != td) | |
107 | prev = &(*prev)->td_hash; | |
108 | if (*prev) | |
109 | *prev = td->td_hash; | |
110 | else if ((td->hwINFO & cpu_to_hc32(hc, TD_DONE)) != 0) | |
111 | ohci_dbg (hc, "no hash for td %p\n", td); | |
112 | dma_pool_free (hc->td_cache, td, td->td_dma); | |
113 | } | |
114 | ||
115 | /*-------------------------------------------------------------------------*/ | |
116 | ||
117 | /* EDs ... */ | |
118 | static struct ed * | |
55016f10 | 119 | ed_alloc (struct ohci_hcd *hc, gfp_t mem_flags) |
1da177e4 LT |
120 | { |
121 | dma_addr_t dma; | |
122 | struct ed *ed; | |
123 | ||
124 | ed = dma_pool_alloc (hc->ed_cache, mem_flags, &dma); | |
125 | if (ed) { | |
126 | memset (ed, 0, sizeof (*ed)); | |
127 | INIT_LIST_HEAD (&ed->td_list); | |
128 | ed->dma = dma; | |
129 | } | |
130 | return ed; | |
131 | } | |
132 | ||
133 | static void | |
134 | ed_free (struct ohci_hcd *hc, struct ed *ed) | |
135 | { | |
136 | dma_pool_free (hc->ed_cache, ed, ed->dma); | |
137 | } | |
138 |