blob: aeda96e0af67bd6eb43b3b607e2c7a3817da8c5d [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 *
Stefan Roese6dbd6822007-05-01 09:29:37 -070030 * There's also "register" data (e.g. PCI or SOC), which is memory mapped.
Linus Torvalds1da177e2005-04-16 15:20:36 -070031 * No memory seen by this driver is pageable.
32 */
33
34/*-------------------------------------------------------------------------*/
35
36/* Allocate the key transfer structures from the previously allocated pool */
37
Stefan Roese6dbd6822007-05-01 09:29:37 -070038static inline void ehci_qtd_init(struct ehci_hcd *ehci, struct ehci_qtd *qtd,
39 dma_addr_t dma)
Linus Torvalds1da177e2005-04-16 15:20:36 -070040{
41 memset (qtd, 0, sizeof *qtd);
42 qtd->qtd_dma = dma;
43 qtd->hw_token = cpu_to_le32 (QTD_STS_HALT);
Stefan Roese6dbd6822007-05-01 09:29:37 -070044 qtd->hw_next = EHCI_LIST_END(ehci);
45 qtd->hw_alt_next = EHCI_LIST_END(ehci);
Linus Torvalds1da177e2005-04-16 15:20:36 -070046 INIT_LIST_HEAD (&qtd->qtd_list);
47}
48
Al Viro55016f12005-10-21 03:21:58 -040049static struct ehci_qtd *ehci_qtd_alloc (struct ehci_hcd *ehci, gfp_t flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -070050{
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) {
Stefan Roese6dbd6822007-05-01 09:29:37 -070056 ehci_qtd_init(ehci, qtd, dma);
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 }
58 return qtd;
59}
60
61static 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
David Brownell9c033e82007-05-17 12:21:19 -070067static void qh_destroy(struct ehci_qh *qh)
Linus Torvalds1da177e2005-04-16 15:20:36 -070068{
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 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);
Alek Du3807e262009-07-14 07:23:29 +080078 dma_pool_free(ehci->qh_pool, qh->hw, qh->qh_dma);
79 kfree(qh);
Linus Torvalds1da177e2005-04-16 15:20:36 -070080}
81
Al Viro55016f12005-10-21 03:21:58 -040082static struct ehci_qh *ehci_qh_alloc (struct ehci_hcd *ehci, gfp_t flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -070083{
84 struct ehci_qh *qh;
85 dma_addr_t dma;
86
Alek Du3807e262009-07-14 07:23:29 +080087 qh = kzalloc(sizeof *qh, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 if (!qh)
Alek Du3807e262009-07-14 07:23:29 +080089 goto done;
90 qh->hw = (struct ehci_qh_hw *)
91 dma_pool_alloc(ehci->qh_pool, flags, &dma);
92 if (!qh->hw)
93 goto fail;
94 memset(qh->hw, 0, sizeof *qh->hw);
David Brownell9c033e82007-05-17 12:21:19 -070095 qh->refcount = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 qh->ehci = ehci;
97 qh->qh_dma = dma;
98 // INIT_LIST_HEAD (&qh->qh_list);
99 INIT_LIST_HEAD (&qh->qtd_list);
100
101 /* dummy td enables safe urb queuing */
102 qh->dummy = ehci_qtd_alloc (ehci, flags);
103 if (qh->dummy == NULL) {
104 ehci_dbg (ehci, "no dummy td\n");
Alek Du3807e262009-07-14 07:23:29 +0800105 goto fail1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 }
Alek Du3807e262009-07-14 07:23:29 +0800107done:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 return qh;
Alek Du3807e262009-07-14 07:23:29 +0800109fail1:
110 dma_pool_free(ehci->qh_pool, qh->hw, qh->qh_dma);
111fail:
112 kfree(qh);
113 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114}
115
116/* to share a qh (cpu threads, or hc) */
117static inline struct ehci_qh *qh_get (struct ehci_qh *qh)
118{
David Brownell9c033e82007-05-17 12:21:19 -0700119 WARN_ON(!qh->refcount);
120 qh->refcount++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 return qh;
122}
123
124static inline void qh_put (struct ehci_qh *qh)
125{
David Brownell9c033e82007-05-17 12:21:19 -0700126 if (!--qh->refcount)
127 qh_destroy(qh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128}
129
130/*-------------------------------------------------------------------------*/
131
David Brownell53bd6a62006-08-30 14:50:06 -0700132/* The queue heads and transfer descriptors are managed from pools tied
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 * to each of the "per device" structures.
134 * This is the initialisation and cleanup code.
135 */
136
137static void ehci_mem_cleanup (struct ehci_hcd *ehci)
138{
Karsten Wiese9aa09d22009-02-08 16:07:58 -0800139 free_cached_itd_list(ehci);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 if (ehci->async)
141 qh_put (ehci->async);
142 ehci->async = NULL;
143
144 /* DMA consistent memory and pools */
145 if (ehci->qtd_pool)
146 dma_pool_destroy (ehci->qtd_pool);
147 ehci->qtd_pool = NULL;
148
149 if (ehci->qh_pool) {
150 dma_pool_destroy (ehci->qh_pool);
151 ehci->qh_pool = NULL;
152 }
153
154 if (ehci->itd_pool)
155 dma_pool_destroy (ehci->itd_pool);
156 ehci->itd_pool = NULL;
157
158 if (ehci->sitd_pool)
159 dma_pool_destroy (ehci->sitd_pool);
160 ehci->sitd_pool = NULL;
161
162 if (ehci->periodic)
163 dma_free_coherent (ehci_to_hcd(ehci)->self.controller,
164 ehci->periodic_size * sizeof (u32),
165 ehci->periodic, ehci->periodic_dma);
166 ehci->periodic = NULL;
167
168 /* shadow periodic table */
Jesper Juhl1bc3c9e2005-04-18 17:39:34 -0700169 kfree(ehci->pshadow);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 ehci->pshadow = NULL;
171}
172
173/* remember to add cleanup code (above) if you add anything here */
Al Viro55016f12005-10-21 03:21:58 -0400174static int ehci_mem_init (struct ehci_hcd *ehci, gfp_t flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175{
176 int i;
177
178 /* QTDs for control/bulk/intr transfers */
David Brownell53bd6a62006-08-30 14:50:06 -0700179 ehci->qtd_pool = dma_pool_create ("ehci_qtd",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 ehci_to_hcd(ehci)->self.controller,
181 sizeof (struct ehci_qtd),
182 32 /* byte alignment (for hw parts) */,
183 4096 /* can't cross 4K */);
184 if (!ehci->qtd_pool) {
185 goto fail;
186 }
187
188 /* QHs for control/bulk/intr transfers */
David Brownell53bd6a62006-08-30 14:50:06 -0700189 ehci->qh_pool = dma_pool_create ("ehci_qh",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 ehci_to_hcd(ehci)->self.controller,
Alek Du3807e262009-07-14 07:23:29 +0800191 sizeof(struct ehci_qh_hw),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 32 /* byte alignment (for hw parts) */,
193 4096 /* can't cross 4K */);
194 if (!ehci->qh_pool) {
195 goto fail;
196 }
197 ehci->async = ehci_qh_alloc (ehci, flags);
198 if (!ehci->async) {
199 goto fail;
200 }
201
202 /* ITD for high speed ISO transfers */
David Brownell53bd6a62006-08-30 14:50:06 -0700203 ehci->itd_pool = dma_pool_create ("ehci_itd",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 ehci_to_hcd(ehci)->self.controller,
205 sizeof (struct ehci_itd),
206 32 /* byte alignment (for hw parts) */,
207 4096 /* can't cross 4K */);
208 if (!ehci->itd_pool) {
209 goto fail;
210 }
211
212 /* SITD for full/low speed split ISO transfers */
David Brownell53bd6a62006-08-30 14:50:06 -0700213 ehci->sitd_pool = dma_pool_create ("ehci_sitd",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 ehci_to_hcd(ehci)->self.controller,
215 sizeof (struct ehci_sitd),
216 32 /* byte alignment (for hw parts) */,
217 4096 /* can't cross 4K */);
218 if (!ehci->sitd_pool) {
219 goto fail;
220 }
221
222 /* Hardware periodic table */
223 ehci->periodic = (__le32 *)
224 dma_alloc_coherent (ehci_to_hcd(ehci)->self.controller,
225 ehci->periodic_size * sizeof(__le32),
226 &ehci->periodic_dma, 0);
227 if (ehci->periodic == NULL) {
228 goto fail;
229 }
230 for (i = 0; i < ehci->periodic_size; i++)
Stefan Roese6dbd6822007-05-01 09:29:37 -0700231 ehci->periodic [i] = EHCI_LIST_END(ehci);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232
233 /* software shadow of hardware table */
Eric Sesterhenn80b6ca42006-02-27 21:29:43 +0100234 ehci->pshadow = kcalloc(ehci->periodic_size, sizeof(void *), flags);
235 if (ehci->pshadow != NULL)
236 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237
238fail:
239 ehci_dbg (ehci, "couldn't init memory\n");
240 ehci_mem_cleanup (ehci);
241 return -ENOMEM;
242}