blob: a8ba2e1497a4fb6d9f7b46bc6068b0cc6fd56371 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Copyright (c) 2001 by David Brownell
David Brownell53bd6a62006-08-30 14:50:06 -07003 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 * 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
David Brownell53bd6a62006-08-30 14:50:06 -070028 * - driver buffers, read/written by HC ... single shot DMA mapped
Linus Torvalds1da177e2005-04-16 15:20:36 -070029 *
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
38static 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
Al Viro55016f12005-10-21 03:21:58 -040048static struct ehci_qtd *ehci_qtd_alloc (struct ehci_hcd *ehci, gfp_t flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -070049{
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
60static 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
66static 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -070078 dma_pool_free (ehci->qh_pool, qh, qh->qh_dma);
79}
80
Al Viro55016f12005-10-21 03:21:58 -040081static struct ehci_qh *ehci_qh_alloc (struct ehci_hcd *ehci, gfp_t flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -070082{
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) */
109static inline struct ehci_qh *qh_get (struct ehci_qh *qh)
110{
111 kref_get(&qh->kref);
112 return qh;
113}
114
115static inline void qh_put (struct ehci_qh *qh)
116{
117 kref_put(&qh->kref, qh_destroy);
118}
119
120/*-------------------------------------------------------------------------*/
121
David Brownell53bd6a62006-08-30 14:50:06 -0700122/* The queue heads and transfer descriptors are managed from pools tied
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 * to each of the "per device" structures.
124 * This is the initialisation and cleanup code.
125 */
126
127static 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 */
Jesper Juhl1bc3c9e2005-04-18 17:39:34 -0700158 kfree(ehci->pshadow);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 ehci->pshadow = NULL;
160}
161
162/* remember to add cleanup code (above) if you add anything here */
Al Viro55016f12005-10-21 03:21:58 -0400163static int ehci_mem_init (struct ehci_hcd *ehci, gfp_t flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164{
165 int i;
166
167 /* QTDs for control/bulk/intr transfers */
David Brownell53bd6a62006-08-30 14:50:06 -0700168 ehci->qtd_pool = dma_pool_create ("ehci_qtd",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 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 */
David Brownell53bd6a62006-08-30 14:50:06 -0700178 ehci->qh_pool = dma_pool_create ("ehci_qh",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 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 */
David Brownell53bd6a62006-08-30 14:50:06 -0700192 ehci->itd_pool = dma_pool_create ("ehci_itd",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 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 */
David Brownell53bd6a62006-08-30 14:50:06 -0700202 ehci->sitd_pool = dma_pool_create ("ehci_sitd",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 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 */
Eric Sesterhenn80b6ca42006-02-27 21:29:43 +0100223 ehci->pshadow = kcalloc(ehci->periodic_size, sizeof(void *), flags);
224 if (ehci->pshadow != NULL)
225 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226
227fail:
228 ehci_dbg (ehci, "couldn't init memory\n");
229 ehci_mem_cleanup (ehci);
230 return -ENOMEM;
231}