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
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 pci_pool or pci_alloc_consistent
28 * - driver buffers, read/written by HC ... single shot DMA mapped
30 * There's also PCI "register" data, which is memory mapped.
31 * No memory seen by this driver is pageable.
34 /*-------------------------------------------------------------------------*/
36 * Allocator / cleanup for the per device structure
37 * Called by hcd init / removal code
39 static struct usb_hcd *ehci_hcd_alloc (void)
41 struct ehci_hcd *ehci;
43 ehci = (struct ehci_hcd *)
44 kmalloc (sizeof (struct ehci_hcd), GFP_KERNEL);
46 memset (ehci, 0, sizeof (struct ehci_hcd));
52 static void ehci_hcd_free (struct usb_hcd *hcd)
54 kfree (hcd_to_ehci (hcd));
57 /*-------------------------------------------------------------------------*/
59 /* Allocate the key transfer structures from the previously allocated pool */
61 static inline void ehci_qtd_init (struct ehci_qtd *qtd, dma_addr_t dma)
63 memset (qtd, 0, sizeof *qtd);
65 qtd->hw_token = cpu_to_le32 (QTD_STS_HALT);
66 qtd->hw_next = EHCI_LIST_END;
67 qtd->hw_alt_next = EHCI_LIST_END;
68 INIT_LIST_HEAD (&qtd->qtd_list);
71 static struct ehci_qtd *ehci_qtd_alloc (struct ehci_hcd *ehci, int flags)
76 qtd = pci_pool_alloc (ehci->qtd_pool, flags, &dma);
78 ehci_qtd_init (qtd, dma);
83 static inline void ehci_qtd_free (struct ehci_hcd *ehci, struct ehci_qtd *qtd)
85 pci_pool_free (ehci->qtd_pool, qtd, qtd->qtd_dma);
89 static struct ehci_qh *ehci_qh_alloc (struct ehci_hcd *ehci, int flags)
94 qh = (struct ehci_qh *)
95 pci_pool_alloc (ehci->qh_pool, flags, &dma);
99 memset (qh, 0, sizeof *qh);
100 atomic_set (&qh->refcount, 1);
102 // INIT_LIST_HEAD (&qh->qh_list);
103 INIT_LIST_HEAD (&qh->qtd_list);
105 /* dummy td enables safe urb queuing */
106 qh->dummy = ehci_qtd_alloc (ehci, flags);
107 if (qh->dummy == 0) {
108 ehci_dbg (ehci, "no dummy td\n");
109 pci_pool_free (ehci->qh_pool, qh, qh->qh_dma);
115 /* to share a qh (cpu threads, or hc) */
116 static inline struct ehci_qh *qh_get (/* ehci, */ struct ehci_qh *qh)
118 atomic_inc (&qh->refcount);
122 static void qh_put (struct ehci_hcd *ehci, struct ehci_qh *qh)
124 if (!atomic_dec_and_test (&qh->refcount))
126 /* clean qtds first, and know this is not linked */
127 if (!list_empty (&qh->qtd_list) || qh->qh_next.ptr) {
128 ehci_dbg (ehci, "unused qh not empty!\n");
132 ehci_qtd_free (ehci, qh->dummy);
133 // usb_put_dev (qh->dev);
134 pci_pool_free (ehci->qh_pool, qh, qh->qh_dma);
137 /*-------------------------------------------------------------------------*/
139 /* The queue heads and transfer descriptors are managed from pools tied
140 * to each of the "per device" structures.
141 * This is the initialisation and cleanup code.
144 static void ehci_mem_cleanup (struct ehci_hcd *ehci)
147 qh_put (ehci, ehci->async);
150 /* PCI consistent memory and pools */
152 pci_pool_destroy (ehci->qtd_pool);
156 pci_pool_destroy (ehci->qh_pool);
161 pci_pool_destroy (ehci->itd_pool);
165 pci_pool_destroy (ehci->sitd_pool);
169 pci_free_consistent (ehci->hcd.pdev,
170 ehci->periodic_size * sizeof (u32),
171 ehci->periodic, ehci->periodic_dma);
174 /* shadow periodic table */
176 kfree (ehci->pshadow);
180 /* remember to add cleanup code (above) if you add anything here */
181 static int ehci_mem_init (struct ehci_hcd *ehci, int flags)
185 /* QTDs for control/bulk/intr transfers */
186 ehci->qtd_pool = pci_pool_create ("ehci_qtd", ehci->hcd.pdev,
187 sizeof (struct ehci_qtd),
188 32 /* byte alignment (for hw parts) */,
189 4096 /* can't cross 4K */,
191 if (!ehci->qtd_pool) {
195 /* QHs for control/bulk/intr transfers */
196 ehci->qh_pool = pci_pool_create ("ehci_qh", ehci->hcd.pdev,
197 sizeof (struct ehci_qh),
198 32 /* byte alignment (for hw parts) */,
199 4096 /* can't cross 4K */,
201 if (!ehci->qh_pool) {
204 ehci->async = ehci_qh_alloc (ehci, flags);
209 /* ITD for high speed ISO transfers */
210 ehci->itd_pool = pci_pool_create ("ehci_itd", ehci->hcd.pdev,
211 sizeof (struct ehci_itd),
212 32 /* byte alignment (for hw parts) */,
213 4096 /* can't cross 4K */,
215 if (!ehci->itd_pool) {
219 /* SITD for full/low speed split ISO transfers */
220 ehci->sitd_pool = pci_pool_create ("ehci_sitd", ehci->hcd.pdev,
221 sizeof (struct ehci_sitd),
222 32 /* byte alignment (for hw parts) */,
223 4096 /* can't cross 4K */,
225 if (!ehci->sitd_pool) {
229 /* Hardware periodic table */
230 ehci->periodic = (u32 *)
231 pci_alloc_consistent (ehci->hcd.pdev,
232 ehci->periodic_size * sizeof (u32),
233 &ehci->periodic_dma);
234 if (ehci->periodic == 0) {
237 for (i = 0; i < ehci->periodic_size; i++)
238 ehci->periodic [i] = EHCI_LIST_END;
240 /* software shadow of hardware table */
241 ehci->pshadow = kmalloc (ehci->periodic_size * sizeof (void *), flags);
242 if (ehci->pshadow == 0) {
245 memset (ehci->pshadow, 0, ehci->periodic_size * sizeof (void *));
250 ehci_dbg (ehci, "couldn't init memory\n");
251 ehci_mem_cleanup (ehci);