1 /* 2 * Copyright (c) 2001 by David Brownell 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License as published by the 6 * Free Software Foundation; either version 2 of the License, or (at your 7 * option) any later version. 8 * 9 * This program is distributed in the hope that it will be useful, but 10 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 11 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write to the Free Software Foundation, 16 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 17 */ 18 19 /* this file is part of ehci-hcd.c */ 20 21 /*-------------------------------------------------------------------------*/ 22 23 /* 24 * There's basically three types of memory: 25 * - data used only by the HCD ... kmalloc is fine 26 * - async and periodic schedules, shared by HC and HCD ... these 27 * need to use dma_pool or dma_alloc_coherent 28 * - driver buffers, read/written by HC ... single shot DMA mapped 29 * 30 * There's also PCI "register" data, which is memory mapped. 31 * No memory seen by this driver is pageable. 32 */ 33 34 /*-------------------------------------------------------------------------*/ 35 36 /* Allocate the key transfer structures from the previously allocated pool */ 37 38 static inline void ehci_qtd_init (struct ehci_qtd *qtd, dma_addr_t dma) 39 { 40 memset (qtd, 0, sizeof *qtd); 41 qtd->qtd_dma = dma; 42 qtd->hw_token = cpu_to_le32 (QTD_STS_HALT); 43 qtd->hw_next = EHCI_LIST_END; 44 qtd->hw_alt_next = EHCI_LIST_END; 45 INIT_LIST_HEAD (&qtd->qtd_list); 46 } 47 48 static struct ehci_qtd *ehci_qtd_alloc (struct ehci_hcd *ehci, gfp_t flags) 49 { 50 struct ehci_qtd *qtd; 51 dma_addr_t dma; 52 53 qtd = dma_pool_alloc (ehci->qtd_pool, flags, &dma); 54 if (qtd != NULL) { 55 ehci_qtd_init (qtd, dma); 56 } 57 return qtd; 58 } 59 60 static inline void ehci_qtd_free (struct ehci_hcd *ehci, struct ehci_qtd *qtd) 61 { 62 dma_pool_free (ehci->qtd_pool, qtd, qtd->qtd_dma); 63 } 64 65 66 static void qh_destroy (struct kref *kref) 67 { 68 struct ehci_qh *qh = container_of(kref, struct ehci_qh, kref); 69 struct ehci_hcd *ehci = qh->ehci; 70 71 /* clean qtds first, and know this is not linked */ 72 if (!list_empty (&qh->qtd_list) || qh->qh_next.ptr) { 73 ehci_dbg (ehci, "unused qh not empty!\n"); 74 BUG (); 75 } 76 if (qh->dummy) 77 ehci_qtd_free (ehci, qh->dummy); 78 dma_pool_free (ehci->qh_pool, qh, qh->qh_dma); 79 } 80 81 static struct ehci_qh *ehci_qh_alloc (struct ehci_hcd *ehci, gfp_t flags) 82 { 83 struct ehci_qh *qh; 84 dma_addr_t dma; 85 86 qh = (struct ehci_qh *) 87 dma_pool_alloc (ehci->qh_pool, flags, &dma); 88 if (!qh) 89 return qh; 90 91 memset (qh, 0, sizeof *qh); 92 kref_init(&qh->kref); 93 qh->ehci = ehci; 94 qh->qh_dma = dma; 95 // INIT_LIST_HEAD (&qh->qh_list); 96 INIT_LIST_HEAD (&qh->qtd_list); 97 98 /* dummy td enables safe urb queuing */ 99 qh->dummy = ehci_qtd_alloc (ehci, flags); 100 if (qh->dummy == NULL) { 101 ehci_dbg (ehci, "no dummy td\n"); 102 dma_pool_free (ehci->qh_pool, qh, qh->qh_dma); 103 qh = NULL; 104 } 105 return qh; 106 } 107 108 /* to share a qh (cpu threads, or hc) */ 109 static inline struct ehci_qh *qh_get (struct ehci_qh *qh) 110 { 111 kref_get(&qh->kref); 112 return qh; 113 } 114 115 static inline void qh_put (struct ehci_qh *qh) 116 { 117 kref_put(&qh->kref, qh_destroy); 118 } 119 120 /*-------------------------------------------------------------------------*/ 121 122 /* The queue heads and transfer descriptors are managed from pools tied 123 * to each of the "per device" structures. 124 * This is the initialisation and cleanup code. 125 */ 126 127 static void ehci_mem_cleanup (struct ehci_hcd *ehci) 128 { 129 if (ehci->async) 130 qh_put (ehci->async); 131 ehci->async = NULL; 132 133 /* DMA consistent memory and pools */ 134 if (ehci->qtd_pool) 135 dma_pool_destroy (ehci->qtd_pool); 136 ehci->qtd_pool = NULL; 137 138 if (ehci->qh_pool) { 139 dma_pool_destroy (ehci->qh_pool); 140 ehci->qh_pool = NULL; 141 } 142 143 if (ehci->itd_pool) 144 dma_pool_destroy (ehci->itd_pool); 145 ehci->itd_pool = NULL; 146 147 if (ehci->sitd_pool) 148 dma_pool_destroy (ehci->sitd_pool); 149 ehci->sitd_pool = NULL; 150 151 if (ehci->periodic) 152 dma_free_coherent (ehci_to_hcd(ehci)->self.controller, 153 ehci->periodic_size * sizeof (u32), 154 ehci->periodic, ehci->periodic_dma); 155 ehci->periodic = NULL; 156 157 /* shadow periodic table */ 158 kfree(ehci->pshadow); 159 ehci->pshadow = NULL; 160 } 161 162 /* remember to add cleanup code (above) if you add anything here */ 163 static int ehci_mem_init (struct ehci_hcd *ehci, gfp_t flags) 164 { 165 int i; 166 167 /* QTDs for control/bulk/intr transfers */ 168 ehci->qtd_pool = dma_pool_create ("ehci_qtd", 169 ehci_to_hcd(ehci)->self.controller, 170 sizeof (struct ehci_qtd), 171 32 /* byte alignment (for hw parts) */, 172 4096 /* can't cross 4K */); 173 if (!ehci->qtd_pool) { 174 goto fail; 175 } 176 177 /* QHs for control/bulk/intr transfers */ 178 ehci->qh_pool = dma_pool_create ("ehci_qh", 179 ehci_to_hcd(ehci)->self.controller, 180 sizeof (struct ehci_qh), 181 32 /* byte alignment (for hw parts) */, 182 4096 /* can't cross 4K */); 183 if (!ehci->qh_pool) { 184 goto fail; 185 } 186 ehci->async = ehci_qh_alloc (ehci, flags); 187 if (!ehci->async) { 188 goto fail; 189 } 190 191 /* ITD for high speed ISO transfers */ 192 ehci->itd_pool = dma_pool_create ("ehci_itd", 193 ehci_to_hcd(ehci)->self.controller, 194 sizeof (struct ehci_itd), 195 32 /* byte alignment (for hw parts) */, 196 4096 /* can't cross 4K */); 197 if (!ehci->itd_pool) { 198 goto fail; 199 } 200 201 /* SITD for full/low speed split ISO transfers */ 202 ehci->sitd_pool = dma_pool_create ("ehci_sitd", 203 ehci_to_hcd(ehci)->self.controller, 204 sizeof (struct ehci_sitd), 205 32 /* byte alignment (for hw parts) */, 206 4096 /* can't cross 4K */); 207 if (!ehci->sitd_pool) { 208 goto fail; 209 } 210 211 /* Hardware periodic table */ 212 ehci->periodic = (__le32 *) 213 dma_alloc_coherent (ehci_to_hcd(ehci)->self.controller, 214 ehci->periodic_size * sizeof(__le32), 215 &ehci->periodic_dma, 0); 216 if (ehci->periodic == NULL) { 217 goto fail; 218 } 219 for (i = 0; i < ehci->periodic_size; i++) 220 ehci->periodic [i] = EHCI_LIST_END; 221 222 /* software shadow of hardware table */ 223 ehci->pshadow = kcalloc(ehci->periodic_size, sizeof(void *), flags); 224 if (ehci->pshadow != NULL) 225 return 0; 226 227 fail: 228 ehci_dbg (ehci, "couldn't init memory\n"); 229 ehci_mem_cleanup (ehci); 230 return -ENOMEM; 231 } 232