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 "register" data (e.g. PCI or SOC), 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_hcd *ehci, struct ehci_qtd *qtd, 39 dma_addr_t dma) 40 { 41 memset (qtd, 0, sizeof *qtd); 42 qtd->qtd_dma = dma; 43 qtd->hw_token = cpu_to_le32 (QTD_STS_HALT); 44 qtd->hw_next = EHCI_LIST_END(ehci); 45 qtd->hw_alt_next = EHCI_LIST_END(ehci); 46 INIT_LIST_HEAD (&qtd->qtd_list); 47 } 48 49 static struct ehci_qtd *ehci_qtd_alloc (struct ehci_hcd *ehci, gfp_t flags) 50 { 51 struct ehci_qtd *qtd; 52 dma_addr_t dma; 53 54 qtd = dma_pool_alloc (ehci->qtd_pool, flags, &dma); 55 if (qtd != NULL) { 56 ehci_qtd_init(ehci, qtd, dma); 57 } 58 return qtd; 59 } 60 61 static inline void ehci_qtd_free (struct ehci_hcd *ehci, struct ehci_qtd *qtd) 62 { 63 dma_pool_free (ehci->qtd_pool, qtd, qtd->qtd_dma); 64 } 65 66 67 static void qh_destroy(struct ehci_qh *qh) 68 { 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 qh->refcount = 1; 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 WARN_ON(!qh->refcount); 112 qh->refcount++; 113 return qh; 114 } 115 116 static inline void qh_put (struct ehci_qh *qh) 117 { 118 if (!--qh->refcount) 119 qh_destroy(qh); 120 } 121 122 /*-------------------------------------------------------------------------*/ 123 124 /* The queue heads and transfer descriptors are managed from pools tied 125 * to each of the "per device" structures. 126 * This is the initialisation and cleanup code. 127 */ 128 129 static void ehci_mem_cleanup (struct ehci_hcd *ehci) 130 { 131 free_cached_itd_list(ehci); 132 if (ehci->async) 133 qh_put (ehci->async); 134 ehci->async = NULL; 135 136 /* DMA consistent memory and pools */ 137 if (ehci->qtd_pool) 138 dma_pool_destroy (ehci->qtd_pool); 139 ehci->qtd_pool = NULL; 140 141 if (ehci->qh_pool) { 142 dma_pool_destroy (ehci->qh_pool); 143 ehci->qh_pool = NULL; 144 } 145 146 if (ehci->itd_pool) 147 dma_pool_destroy (ehci->itd_pool); 148 ehci->itd_pool = NULL; 149 150 if (ehci->sitd_pool) 151 dma_pool_destroy (ehci->sitd_pool); 152 ehci->sitd_pool = NULL; 153 154 if (ehci->periodic) 155 dma_free_coherent (ehci_to_hcd(ehci)->self.controller, 156 ehci->periodic_size * sizeof (u32), 157 ehci->periodic, ehci->periodic_dma); 158 ehci->periodic = NULL; 159 160 /* shadow periodic table */ 161 kfree(ehci->pshadow); 162 ehci->pshadow = NULL; 163 } 164 165 /* remember to add cleanup code (above) if you add anything here */ 166 static int ehci_mem_init (struct ehci_hcd *ehci, gfp_t flags) 167 { 168 int i; 169 170 /* QTDs for control/bulk/intr transfers */ 171 ehci->qtd_pool = dma_pool_create ("ehci_qtd", 172 ehci_to_hcd(ehci)->self.controller, 173 sizeof (struct ehci_qtd), 174 32 /* byte alignment (for hw parts) */, 175 4096 /* can't cross 4K */); 176 if (!ehci->qtd_pool) { 177 goto fail; 178 } 179 180 /* QHs for control/bulk/intr transfers */ 181 ehci->qh_pool = dma_pool_create ("ehci_qh", 182 ehci_to_hcd(ehci)->self.controller, 183 sizeof (struct ehci_qh), 184 32 /* byte alignment (for hw parts) */, 185 4096 /* can't cross 4K */); 186 if (!ehci->qh_pool) { 187 goto fail; 188 } 189 ehci->async = ehci_qh_alloc (ehci, flags); 190 if (!ehci->async) { 191 goto fail; 192 } 193 194 /* ITD for high speed ISO transfers */ 195 ehci->itd_pool = dma_pool_create ("ehci_itd", 196 ehci_to_hcd(ehci)->self.controller, 197 sizeof (struct ehci_itd), 198 32 /* byte alignment (for hw parts) */, 199 4096 /* can't cross 4K */); 200 if (!ehci->itd_pool) { 201 goto fail; 202 } 203 204 /* SITD for full/low speed split ISO transfers */ 205 ehci->sitd_pool = dma_pool_create ("ehci_sitd", 206 ehci_to_hcd(ehci)->self.controller, 207 sizeof (struct ehci_sitd), 208 32 /* byte alignment (for hw parts) */, 209 4096 /* can't cross 4K */); 210 if (!ehci->sitd_pool) { 211 goto fail; 212 } 213 214 /* Hardware periodic table */ 215 ehci->periodic = (__le32 *) 216 dma_alloc_coherent (ehci_to_hcd(ehci)->self.controller, 217 ehci->periodic_size * sizeof(__le32), 218 &ehci->periodic_dma, 0); 219 if (ehci->periodic == NULL) { 220 goto fail; 221 } 222 for (i = 0; i < ehci->periodic_size; i++) 223 ehci->periodic [i] = EHCI_LIST_END(ehci); 224 225 /* software shadow of hardware table */ 226 ehci->pshadow = kcalloc(ehci->periodic_size, sizeof(void *), flags); 227 if (ehci->pshadow != NULL) 228 return 0; 229 230 fail: 231 ehci_dbg (ehci, "couldn't init memory\n"); 232 ehci_mem_cleanup (ehci); 233 return -ENOMEM; 234 } 235