projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 |