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 } 138 139