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 } 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 * 85 td_alloc (struct ohci_hcd *hc, gfp_t mem_flags) 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 * 119 ed_alloc (struct ohci_hcd *hc, gfp_t mem_flags) 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 } 138 139