| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-1.0+ |
| 2 | /* |
| 3 | * OHCI HCD (Host Controller Driver) for USB. |
| 4 | * |
| 5 | * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at> |
| 6 | * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net> |
| 7 | * |
| 8 | * This file is licenced under the GPL. |
| 9 | */ |
| 10 | |
| 11 | /*-------------------------------------------------------------------------*/ |
| 12 | |
| 13 | /* |
| 14 | * OHCI deals with three types of memory: |
| 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 | * |
| 21 | * There's also "register" data, which is memory mapped. |
| 22 | * No memory seen by this driver (or any HCD) may be paged out. |
| 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); |
| 32 | INIT_LIST_HEAD(&ohci->eds_in_use); |
| 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 * |
| 87 | td_alloc (struct ohci_hcd *hc, gfp_t mem_flags) |
| 88 | { |
| 89 | dma_addr_t dma; |
| 90 | struct td *td; |
| 91 | |
| 92 | td = dma_pool_zalloc (hc->td_cache, mem_flags, &dma); |
| 93 | if (td) { |
| 94 | /* in case hc fetches it, make it look dead */ |
| 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 * |
| 120 | ed_alloc (struct ohci_hcd *hc, gfp_t mem_flags) |
| 121 | { |
| 122 | dma_addr_t dma; |
| 123 | struct ed *ed; |
| 124 | |
| 125 | ed = dma_pool_zalloc (hc->ed_cache, mem_flags, &dma); |
| 126 | if (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 | |