1 /* 2 * OHCI HCD (Host Controller Driver) for USB. 3 * 4 * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at> 5 * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net> 6 * 7 * This file is licenced under the GPL. 8 */ 9 10 /*-------------------------------------------------------------------------*/ 11 12 /* 13 * OHCI deals with three types of memory: 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 * 20 * There's also "register" data, which is memory mapped. 21 * No memory seen by this driver (or any HCD) may be paged out. 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); 31 INIT_LIST_HEAD(&ohci->eds_in_use); 32 } 33 34 /*-------------------------------------------------------------------------*/ 35 36 static int ohci_mem_init (struct ohci_hcd *ohci) 37 { 38 ohci->td_cache = dma_pool_create ("ohci_td", 39 ohci_to_hcd(ohci)->self.controller, 40 sizeof (struct td), 41 32 /* byte alignment */, 42 0 /* no page-crossing issues */); 43 if (!ohci->td_cache) 44 return -ENOMEM; 45 ohci->ed_cache = dma_pool_create ("ohci_ed", 46 ohci_to_hcd(ohci)->self.controller, 47 sizeof (struct ed), 48 16 /* byte alignment */, 49 0 /* no page-crossing issues */); 50 if (!ohci->ed_cache) { 51 dma_pool_destroy (ohci->td_cache); 52 return -ENOMEM; 53 } 54 return 0; 55 } 56 57 static void ohci_mem_cleanup (struct ohci_hcd *ohci) 58 { 59 if (ohci->td_cache) { 60 dma_pool_destroy (ohci->td_cache); 61 ohci->td_cache = NULL; 62 } 63 if (ohci->ed_cache) { 64 dma_pool_destroy (ohci->ed_cache); 65 ohci->ed_cache = NULL; 66 } 67 } 68 69 /*-------------------------------------------------------------------------*/ 70 71 /* ohci "done list" processing needs this mapping */ 72 static inline struct td * 73 dma_to_td (struct ohci_hcd *hc, dma_addr_t td_dma) 74 { 75 struct td *td; 76 77 td_dma &= TD_MASK; 78 td = hc->td_hash [TD_HASH_FUNC(td_dma)]; 79 while (td && td->td_dma != td_dma) 80 td = td->td_hash; 81 return td; 82 } 83 84 /* TDs ... */ 85 static struct td * 86 td_alloc (struct ohci_hcd *hc, gfp_t mem_flags) 87 { 88 dma_addr_t dma; 89 struct td *td; 90 91 td = dma_pool_alloc (hc->td_cache, mem_flags, &dma); 92 if (td) { 93 /* in case hc fetches it, make it look dead */ 94 memset (td, 0, sizeof *td); 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_alloc (hc->ed_cache, mem_flags, &dma); 126 if (ed) { 127 memset (ed, 0, sizeof (*ed)); 128 INIT_LIST_HEAD (&ed->td_list); 129 ed->dma = dma; 130 } 131 return ed; 132 } 133 134 static void 135 ed_free (struct ohci_hcd *hc, struct ed *ed) 136 { 137 dma_pool_free (hc->ed_cache, ed, ed->dma); 138 } 139 140