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5fd54ace | 1 | // SPDX-License-Identifier: GPL-1.0+ |
1da177e4 LT |
2 | /* |
3 | * OHCI HCD (Host Controller Driver) for USB. | |
dd9048af | 4 | * |
1da177e4 LT |
5 | * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at> |
6 | * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net> | |
dd9048af | 7 | * |
1da177e4 LT |
8 | * This file is licenced under the GPL. |
9 | */ | |
10 | ||
11 | /*-------------------------------------------------------------------------*/ | |
12 | ||
13 | /* | |
dd9048af | 14 | * OHCI deals with three types of memory: |
1da177e4 LT |
15 | * - data used only by the HCD ... kmalloc is fine |
16 | * - async and periodic schedules, shared by HC and HCD ... these | |
17 | * need to use dma_pool or dma_alloc_coherent | |
18 | * - driver buffers, read/written by HC ... the hcd glue or the | |
19 | * device driver provides us with dma addresses | |
20 | * | |
dd9048af DB |
21 | * There's also "register" data, which is memory mapped. |
22 | * No memory seen by this driver (or any HCD) may be paged out. | |
1da177e4 LT |
23 | */ |
24 | ||
25 | /*-------------------------------------------------------------------------*/ | |
26 | ||
27 | static void ohci_hcd_init (struct ohci_hcd *ohci) | |
28 | { | |
29 | ohci->next_statechange = jiffies; | |
30 | spin_lock_init (&ohci->lock); | |
31 | INIT_LIST_HEAD (&ohci->pending); | |
81e38333 | 32 | INIT_LIST_HEAD(&ohci->eds_in_use); |
1da177e4 LT |
33 | } |
34 | ||
35 | /*-------------------------------------------------------------------------*/ | |
36 | ||
37 | static int ohci_mem_init (struct ohci_hcd *ohci) | |
38 | { | |
39 | ohci->td_cache = dma_pool_create ("ohci_td", | |
40 | ohci_to_hcd(ohci)->self.controller, | |
41 | sizeof (struct td), | |
42 | 32 /* byte alignment */, | |
43 | 0 /* no page-crossing issues */); | |
44 | if (!ohci->td_cache) | |
45 | return -ENOMEM; | |
46 | ohci->ed_cache = dma_pool_create ("ohci_ed", | |
47 | ohci_to_hcd(ohci)->self.controller, | |
48 | sizeof (struct ed), | |
49 | 16 /* byte alignment */, | |
50 | 0 /* no page-crossing issues */); | |
51 | if (!ohci->ed_cache) { | |
52 | dma_pool_destroy (ohci->td_cache); | |
53 | return -ENOMEM; | |
54 | } | |
55 | return 0; | |
56 | } | |
57 | ||
58 | static void ohci_mem_cleanup (struct ohci_hcd *ohci) | |
59 | { | |
60 | if (ohci->td_cache) { | |
61 | dma_pool_destroy (ohci->td_cache); | |
62 | ohci->td_cache = NULL; | |
63 | } | |
64 | if (ohci->ed_cache) { | |
65 | dma_pool_destroy (ohci->ed_cache); | |
66 | ohci->ed_cache = NULL; | |
67 | } | |
68 | } | |
69 | ||
70 | /*-------------------------------------------------------------------------*/ | |
71 | ||
72 | /* ohci "done list" processing needs this mapping */ | |
73 | static inline struct td * | |
74 | dma_to_td (struct ohci_hcd *hc, dma_addr_t td_dma) | |
75 | { | |
76 | struct td *td; | |
77 | ||
78 | td_dma &= TD_MASK; | |
79 | td = hc->td_hash [TD_HASH_FUNC(td_dma)]; | |
80 | while (td && td->td_dma != td_dma) | |
81 | td = td->td_hash; | |
82 | return td; | |
83 | } | |
84 | ||
85 | /* TDs ... */ | |
86 | static struct td * | |
55016f10 | 87 | td_alloc (struct ohci_hcd *hc, gfp_t mem_flags) |
1da177e4 LT |
88 | { |
89 | dma_addr_t dma; | |
90 | struct td *td; | |
91 | ||
8694f59c | 92 | td = dma_pool_zalloc (hc->td_cache, mem_flags, &dma); |
1da177e4 LT |
93 | if (td) { |
94 | /* in case hc fetches it, make it look dead */ | |
1da177e4 LT |
95 | td->hwNextTD = cpu_to_hc32 (hc, dma); |
96 | td->td_dma = dma; | |
97 | /* hashed in td_fill */ | |
98 | } | |
99 | return td; | |
100 | } | |
101 | ||
102 | static void | |
103 | td_free (struct ohci_hcd *hc, struct td *td) | |
104 | { | |
105 | struct td **prev = &hc->td_hash [TD_HASH_FUNC (td->td_dma)]; | |
106 | ||
107 | while (*prev && *prev != td) | |
108 | prev = &(*prev)->td_hash; | |
109 | if (*prev) | |
110 | *prev = td->td_hash; | |
111 | else if ((td->hwINFO & cpu_to_hc32(hc, TD_DONE)) != 0) | |
112 | ohci_dbg (hc, "no hash for td %p\n", td); | |
113 | dma_pool_free (hc->td_cache, td, td->td_dma); | |
114 | } | |
115 | ||
116 | /*-------------------------------------------------------------------------*/ | |
117 | ||
118 | /* EDs ... */ | |
119 | static struct ed * | |
55016f10 | 120 | ed_alloc (struct ohci_hcd *hc, gfp_t mem_flags) |
1da177e4 LT |
121 | { |
122 | dma_addr_t dma; | |
123 | struct ed *ed; | |
124 | ||
8694f59c | 125 | ed = dma_pool_zalloc (hc->ed_cache, mem_flags, &dma); |
1da177e4 | 126 | if (ed) { |
1da177e4 LT |
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 |