Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
[linux/fpc-iii.git] / drivers / usb / host / ehci-mem.c
blobc0fb6a8ae6a3935e367e4a9c386e051acc739338
1 /*
2 * Copyright (c) 2001 by David Brownell
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.
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.
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.
19 /* this file is part of ehci-hcd.c */
21 /*-------------------------------------------------------------------------*/
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
30 * There's also "register" data (e.g. PCI or SOC), which is memory mapped.
31 * No memory seen by this driver is pageable.
34 /*-------------------------------------------------------------------------*/
36 /* Allocate the key transfer structures from the previously allocated pool */
38 static inline void ehci_qtd_init(struct ehci_hcd *ehci, struct ehci_qtd *qtd,
39 dma_addr_t dma)
41 memset (qtd, 0, sizeof *qtd);
42 qtd->qtd_dma = dma;
43 qtd->hw_token = cpu_to_hc32(ehci, 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);
49 static struct ehci_qtd *ehci_qtd_alloc (struct ehci_hcd *ehci, gfp_t flags)
51 struct ehci_qtd *qtd;
52 dma_addr_t dma;
54 qtd = dma_pool_alloc (ehci->qtd_pool, flags, &dma);
55 if (qtd != NULL) {
56 ehci_qtd_init(ehci, qtd, dma);
58 return qtd;
61 static inline void ehci_qtd_free (struct ehci_hcd *ehci, struct ehci_qtd *qtd)
63 dma_pool_free (ehci->qtd_pool, qtd, qtd->qtd_dma);
67 static void qh_destroy(struct ehci_hcd *ehci, struct ehci_qh *qh)
69 /* clean qtds first, and know this is not linked */
70 if (!list_empty (&qh->qtd_list) || qh->qh_next.ptr) {
71 ehci_dbg (ehci, "unused qh not empty!\n");
72 BUG ();
74 if (qh->dummy)
75 ehci_qtd_free (ehci, qh->dummy);
76 dma_pool_free(ehci->qh_pool, qh->hw, qh->qh_dma);
77 kfree(qh);
80 static struct ehci_qh *ehci_qh_alloc (struct ehci_hcd *ehci, gfp_t flags)
82 struct ehci_qh *qh;
83 dma_addr_t dma;
85 qh = kzalloc(sizeof *qh, GFP_ATOMIC);
86 if (!qh)
87 goto done;
88 qh->hw = (struct ehci_qh_hw *)
89 dma_pool_alloc(ehci->qh_pool, flags, &dma);
90 if (!qh->hw)
91 goto fail;
92 memset(qh->hw, 0, sizeof *qh->hw);
93 qh->qh_dma = dma;
94 // INIT_LIST_HEAD (&qh->qh_list);
95 INIT_LIST_HEAD (&qh->qtd_list);
96 INIT_LIST_HEAD(&qh->unlink_node);
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 goto fail1;
104 done:
105 return qh;
106 fail1:
107 dma_pool_free(ehci->qh_pool, qh->hw, qh->qh_dma);
108 fail:
109 kfree(qh);
110 return NULL;
113 /*-------------------------------------------------------------------------*/
115 /* The queue heads and transfer descriptors are managed from pools tied
116 * to each of the "per device" structures.
117 * This is the initialisation and cleanup code.
120 static void ehci_mem_cleanup (struct ehci_hcd *ehci)
122 if (ehci->async)
123 qh_destroy(ehci, ehci->async);
124 ehci->async = NULL;
126 if (ehci->dummy)
127 qh_destroy(ehci, ehci->dummy);
128 ehci->dummy = NULL;
130 /* DMA consistent memory and pools */
131 if (ehci->qtd_pool)
132 dma_pool_destroy (ehci->qtd_pool);
133 ehci->qtd_pool = NULL;
135 if (ehci->qh_pool) {
136 dma_pool_destroy (ehci->qh_pool);
137 ehci->qh_pool = NULL;
140 if (ehci->itd_pool)
141 dma_pool_destroy (ehci->itd_pool);
142 ehci->itd_pool = NULL;
144 if (ehci->sitd_pool)
145 dma_pool_destroy (ehci->sitd_pool);
146 ehci->sitd_pool = NULL;
148 if (ehci->periodic)
149 dma_free_coherent (ehci_to_hcd(ehci)->self.controller,
150 ehci->periodic_size * sizeof (u32),
151 ehci->periodic, ehci->periodic_dma);
152 ehci->periodic = NULL;
154 /* shadow periodic table */
155 kfree(ehci->pshadow);
156 ehci->pshadow = NULL;
159 /* remember to add cleanup code (above) if you add anything here */
160 static int ehci_mem_init (struct ehci_hcd *ehci, gfp_t flags)
162 int i;
164 /* QTDs for control/bulk/intr transfers */
165 ehci->qtd_pool = dma_pool_create ("ehci_qtd",
166 ehci_to_hcd(ehci)->self.controller,
167 sizeof (struct ehci_qtd),
168 32 /* byte alignment (for hw parts) */,
169 4096 /* can't cross 4K */);
170 if (!ehci->qtd_pool) {
171 goto fail;
174 /* QHs for control/bulk/intr transfers */
175 ehci->qh_pool = dma_pool_create ("ehci_qh",
176 ehci_to_hcd(ehci)->self.controller,
177 sizeof(struct ehci_qh_hw),
178 32 /* byte alignment (for hw parts) */,
179 4096 /* can't cross 4K */);
180 if (!ehci->qh_pool) {
181 goto fail;
183 ehci->async = ehci_qh_alloc (ehci, flags);
184 if (!ehci->async) {
185 goto fail;
188 /* ITD for high speed ISO transfers */
189 ehci->itd_pool = dma_pool_create ("ehci_itd",
190 ehci_to_hcd(ehci)->self.controller,
191 sizeof (struct ehci_itd),
192 32 /* byte alignment (for hw parts) */,
193 4096 /* can't cross 4K */);
194 if (!ehci->itd_pool) {
195 goto fail;
198 /* SITD for full/low speed split ISO transfers */
199 ehci->sitd_pool = dma_pool_create ("ehci_sitd",
200 ehci_to_hcd(ehci)->self.controller,
201 sizeof (struct ehci_sitd),
202 32 /* byte alignment (for hw parts) */,
203 4096 /* can't cross 4K */);
204 if (!ehci->sitd_pool) {
205 goto fail;
208 /* Hardware periodic table */
209 ehci->periodic = (__le32 *)
210 dma_alloc_coherent (ehci_to_hcd(ehci)->self.controller,
211 ehci->periodic_size * sizeof(__le32),
212 &ehci->periodic_dma, 0);
213 if (ehci->periodic == NULL) {
214 goto fail;
217 if (ehci->use_dummy_qh) {
218 struct ehci_qh_hw *hw;
219 ehci->dummy = ehci_qh_alloc(ehci, flags);
220 if (!ehci->dummy)
221 goto fail;
223 hw = ehci->dummy->hw;
224 hw->hw_next = EHCI_LIST_END(ehci);
225 hw->hw_qtd_next = EHCI_LIST_END(ehci);
226 hw->hw_alt_next = EHCI_LIST_END(ehci);
227 ehci->dummy->hw = hw;
229 for (i = 0; i < ehci->periodic_size; i++)
230 ehci->periodic[i] = cpu_to_hc32(ehci,
231 ehci->dummy->qh_dma);
232 } else {
233 for (i = 0; i < ehci->periodic_size; i++)
234 ehci->periodic[i] = EHCI_LIST_END(ehci);
237 /* software shadow of hardware table */
238 ehci->pshadow = kcalloc(ehci->periodic_size, sizeof(void *), flags);
239 if (ehci->pshadow != NULL)
240 return 0;
242 fail:
243 ehci_dbg (ehci, "couldn't init memory\n");
244 ehci_mem_cleanup (ehci);
245 return -ENOMEM;