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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 846 | giacomo | 1 | /* |
| 2 | * OHCI HCD (Host Controller Driver) for USB. |
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| 3 | * |
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| 4 | * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at> |
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| 5 | * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net> |
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| 6 | * |
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| 7 | * This file is licenced under the GPL. |
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| 8 | */ |
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| 9 | |||
| 10 | /*-------------------------------------------------------------------------*/ |
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| 11 | |||
| 12 | /* |
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| 13 | * There's basically three types of memory: |
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| 14 | * - data used only by the HCD ... kmalloc is fine |
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| 15 | * - async and periodic schedules, shared by HC and HCD ... these |
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| 16 | * need to use pci_pool or pci_alloc_consistent |
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| 17 | * - driver buffers, read/written by HC ... the hcd glue or the |
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| 18 | * device driver provides us with dma addresses |
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| 19 | * |
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| 20 | * There's also PCI "register" data, which is memory mapped. |
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| 21 | * No memory seen by this driver is pagable. |
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| 22 | */ |
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| 23 | |||
| 24 | /*-------------------------------------------------------------------------*/ |
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| 25 | |||
| 26 | static struct usb_hcd *ohci_hcd_alloc (void) |
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| 27 | { |
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| 28 | struct ohci_hcd *ohci; |
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| 29 | |||
| 30 | ohci = (struct ohci_hcd *) kmalloc (sizeof *ohci, GFP_KERNEL); |
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| 31 | if (ohci != 0) { |
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| 32 | memset (ohci, 0, sizeof (struct ohci_hcd)); |
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| 33 | ohci->hcd.product_desc = "OHCI Host Controller"; |
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| 34 | return &ohci->hcd; |
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| 35 | } |
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| 36 | return 0; |
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| 37 | } |
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| 38 | |||
| 39 | static void ohci_hcd_free (struct usb_hcd *hcd) |
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| 40 | { |
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| 41 | kfree (hcd_to_ohci (hcd)); |
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| 42 | } |
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| 43 | |||
| 44 | /*-------------------------------------------------------------------------*/ |
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| 45 | |||
| 46 | static int ohci_mem_init (struct ohci_hcd *ohci) |
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| 47 | { |
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| 48 | ohci->td_cache = pci_pool_create ("ohci_td", ohci->hcd.pdev, |
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| 49 | sizeof (struct td), |
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| 50 | 32 /* byte alignment */, |
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| 51 | |||
| 52 | if (!ohci->td_cache) |
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| 53 | return -ENOMEM; |
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| 54 | ohci->ed_cache = pci_pool_create ("ohci_ed", ohci->hcd.pdev, |
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| 55 | sizeof (struct ed), |
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| 56 | 16 /* byte alignment */, |
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| 57 | |||
| 58 | if (!ohci->ed_cache) { |
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| 59 | pci_pool_destroy (ohci->td_cache); |
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| 60 | return -ENOMEM; |
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| 61 | } |
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| 62 | return 0; |
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| 63 | } |
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| 64 | |||
| 65 | static void ohci_mem_cleanup (struct ohci_hcd *ohci) |
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| 66 | { |
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| 67 | if (ohci->td_cache) { |
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| 68 | pci_pool_destroy (ohci->td_cache); |
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| 69 | ohci->td_cache = 0; |
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| 70 | } |
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| 71 | if (ohci->ed_cache) { |
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| 72 | pci_pool_destroy (ohci->ed_cache); |
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| 73 | ohci->ed_cache = 0; |
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| 74 | } |
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| 75 | } |
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| 76 | |||
| 77 | /*-------------------------------------------------------------------------*/ |
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| 78 | |||
| 79 | /* ohci "done list" processing needs this mapping */ |
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| 80 | static inline struct td * |
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| 81 | dma_to_td (struct ohci_hcd *hc, dma_addr_t td_dma) |
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| 82 | { |
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| 83 | struct td *td; |
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| 84 | |||
| 85 | td_dma &= TD_MASK; |
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| 86 | td = hc->td_hash [TD_HASH_FUNC(td_dma)]; |
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| 87 | while (td && td->td_dma != td_dma) |
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| 88 | td = td->td_hash; |
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| 89 | return td; |
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| 90 | } |
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| 91 | |||
| 92 | /* TDs ... */ |
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| 93 | static struct td * |
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| 94 | td_alloc (struct ohci_hcd *hc, int mem_flags) |
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| 95 | { |
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| 96 | dma_addr_t dma; |
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| 97 | struct td *td; |
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| 98 | |||
| 99 | td = pci_pool_alloc (hc->td_cache, mem_flags, &dma); |
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| 100 | if (td) { |
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| 101 | /* in case hc fetches it, make it look dead */ |
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| 102 | memset (td, 0, sizeof *td); |
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| 103 | td->hwNextTD = cpu_to_le32 (dma); |
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| 104 | td->td_dma = dma; |
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| 105 | /* hashed in td_fill */ |
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| 106 | } |
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| 107 | return td; |
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| 108 | } |
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| 109 | |||
| 110 | static void |
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| 111 | td_free (struct ohci_hcd *hc, struct td *td) |
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| 112 | { |
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| 113 | struct td **prev = &hc->td_hash [TD_HASH_FUNC (td->td_dma)]; |
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| 114 | |||
| 115 | while (*prev && *prev != td) |
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| 116 | prev = &(*prev)->td_hash; |
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| 117 | if (*prev) |
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| 118 | *prev = td->td_hash; |
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| 119 | else if ((td->hwINFO & TD_DONE) != 0) |
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| 120 | ohci_dbg (hc, "no hash for td %p\n", td); |
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| 121 | pci_pool_free (hc->td_cache, td, td->td_dma); |
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| 122 | } |
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| 123 | |||
| 124 | /*-------------------------------------------------------------------------*/ |
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| 125 | |||
| 126 | /* EDs ... */ |
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| 127 | static struct ed * |
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| 128 | ed_alloc (struct ohci_hcd *hc, int mem_flags) |
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| 129 | { |
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| 130 | dma_addr_t dma; |
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| 131 | struct ed *ed; |
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| 132 | |||
| 133 | ed = pci_pool_alloc (hc->ed_cache, mem_flags, &dma); |
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| 134 | if (ed) { |
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| 135 | memset (ed, 0, sizeof (*ed)); |
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| 136 | INIT_LIST_HEAD (&ed->td_list); |
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| 137 | ed->dma = dma; |
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| 138 | } |
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| 139 | return ed; |
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| 140 | } |
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| 141 | |||
| 142 | static void |
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| 143 | ed_free (struct ohci_hcd *hc, struct ed *ed) |
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| 144 | { |
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| 145 | pci_pool_free (hc->ed_cache, ed, ed->dma); |
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| 146 | } |
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| 147 |