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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/usb/host/ehci-mem.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/usb/host/ehci-mem.c')
-rw-r--r--drivers/usb/host/ehci-mem.c237
1 files changed, 237 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci-mem.c b/drivers/usb/host/ehci-mem.c
new file mode 100644
index 000000000000..9938697ff361
--- /dev/null
+++ b/drivers/usb/host/ehci-mem.c
@@ -0,0 +1,237 @@
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
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
48static struct ehci_qtd *ehci_qtd_alloc (struct ehci_hcd *ehci, int 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
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);
78 usb_put_dev (qh->dev);
79 dma_pool_free (ehci->qh_pool, qh, qh->qh_dma);
80}
81
82static struct ehci_qh *ehci_qh_alloc (struct ehci_hcd *ehci, int flags)
83{
84 struct ehci_qh *qh;
85 dma_addr_t dma;
86
87 qh = (struct ehci_qh *)
88 dma_pool_alloc (ehci->qh_pool, flags, &dma);
89 if (!qh)
90 return qh;
91
92 memset (qh, 0, sizeof *qh);
93 kref_init(&qh->kref);
94 qh->ehci = ehci;
95 qh->qh_dma = dma;
96 // INIT_LIST_HEAD (&qh->qh_list);
97 INIT_LIST_HEAD (&qh->qtd_list);
98
99 /* dummy td enables safe urb queuing */
100 qh->dummy = ehci_qtd_alloc (ehci, flags);
101 if (qh->dummy == NULL) {
102 ehci_dbg (ehci, "no dummy td\n");
103 dma_pool_free (ehci->qh_pool, qh, qh->qh_dma);
104 qh = NULL;
105 }
106 return qh;
107}
108
109/* to share a qh (cpu threads, or hc) */
110static inline struct ehci_qh *qh_get (struct ehci_qh *qh)
111{
112 kref_get(&qh->kref);
113 return qh;
114}
115
116static inline void qh_put (struct ehci_qh *qh)
117{
118 kref_put(&qh->kref, qh_destroy);
119}
120
121/*-------------------------------------------------------------------------*/
122
123/* The queue heads and transfer descriptors are managed from pools tied
124 * to each of the "per device" structures.
125 * This is the initialisation and cleanup code.
126 */
127
128static void ehci_mem_cleanup (struct ehci_hcd *ehci)
129{
130 if (ehci->async)
131 qh_put (ehci->async);
132 ehci->async = NULL;
133
134 /* DMA consistent memory and pools */
135 if (ehci->qtd_pool)
136 dma_pool_destroy (ehci->qtd_pool);
137 ehci->qtd_pool = NULL;
138
139 if (ehci->qh_pool) {
140 dma_pool_destroy (ehci->qh_pool);
141 ehci->qh_pool = NULL;
142 }
143
144 if (ehci->itd_pool)
145 dma_pool_destroy (ehci->itd_pool);
146 ehci->itd_pool = NULL;
147
148 if (ehci->sitd_pool)
149 dma_pool_destroy (ehci->sitd_pool);
150 ehci->sitd_pool = NULL;
151
152 if (ehci->periodic)
153 dma_free_coherent (ehci_to_hcd(ehci)->self.controller,
154 ehci->periodic_size * sizeof (u32),
155 ehci->periodic, ehci->periodic_dma);
156 ehci->periodic = NULL;
157
158 /* shadow periodic table */
159 if (ehci->pshadow)
160 kfree (ehci->pshadow);
161 ehci->pshadow = NULL;
162}
163
164/* remember to add cleanup code (above) if you add anything here */
165static int ehci_mem_init (struct ehci_hcd *ehci, int flags)
166{
167 int i;
168
169 /* QTDs for control/bulk/intr transfers */
170 ehci->qtd_pool = dma_pool_create ("ehci_qtd",
171 ehci_to_hcd(ehci)->self.controller,
172 sizeof (struct ehci_qtd),
173 32 /* byte alignment (for hw parts) */,
174 4096 /* can't cross 4K */);
175 if (!ehci->qtd_pool) {
176 goto fail;
177 }
178
179 /* QHs for control/bulk/intr transfers */
180 ehci->qh_pool = dma_pool_create ("ehci_qh",
181 ehci_to_hcd(ehci)->self.controller,
182 sizeof (struct ehci_qh),
183 32 /* byte alignment (for hw parts) */,
184 4096 /* can't cross 4K */);
185 if (!ehci->qh_pool) {
186 goto fail;
187 }
188 ehci->async = ehci_qh_alloc (ehci, flags);
189 if (!ehci->async) {
190 goto fail;
191 }
192
193 /* ITD for high speed ISO transfers */
194 ehci->itd_pool = dma_pool_create ("ehci_itd",
195 ehci_to_hcd(ehci)->self.controller,
196 sizeof (struct ehci_itd),
197 32 /* byte alignment (for hw parts) */,
198 4096 /* can't cross 4K */);
199 if (!ehci->itd_pool) {
200 goto fail;
201 }
202
203 /* SITD for full/low speed split ISO transfers */
204 ehci->sitd_pool = dma_pool_create ("ehci_sitd",
205 ehci_to_hcd(ehci)->self.controller,
206 sizeof (struct ehci_sitd),
207 32 /* byte alignment (for hw parts) */,
208 4096 /* can't cross 4K */);
209 if (!ehci->sitd_pool) {
210 goto fail;
211 }
212
213 /* Hardware periodic table */
214 ehci->periodic = (__le32 *)
215 dma_alloc_coherent (ehci_to_hcd(ehci)->self.controller,
216 ehci->periodic_size * sizeof(__le32),
217 &ehci->periodic_dma, 0);
218 if (ehci->periodic == NULL) {
219 goto fail;
220 }
221 for (i = 0; i < ehci->periodic_size; i++)
222 ehci->periodic [i] = EHCI_LIST_END;
223
224 /* software shadow of hardware table */
225 ehci->pshadow = kmalloc (ehci->periodic_size * sizeof (void *), flags);
226 if (ehci->pshadow == NULL) {
227 goto fail;
228 }
229 memset (ehci->pshadow, 0, ehci->periodic_size * sizeof (void *));
230
231 return 0;
232
233fail:
234 ehci_dbg (ehci, "couldn't init memory\n");
235 ehci_mem_cleanup (ehci);
236 return -ENOMEM;
237}