2 * OHCI HCD (Host Controller Driver) for USB.
4 * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
5 * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
7 * This file is licenced under the GPL.
10 /*-------------------------------------------------------------------------*/
13 * There's basically three types of memory:
14 * - data used only by the HCD ... kmalloc is fine
15 * - async and periodic schedules, shared by HC and HCD ... these
16 * need to use dma_pool or dma_alloc_coherent
17 * - driver buffers, read/written by HC ... the hcd glue or the
18 * device driver provides us with dma addresses
20 * There's also PCI "register" data, which is memory mapped.
21 * No memory seen by this driver is pagable.
24 /*-------------------------------------------------------------------------*/
26 static struct usb_hcd *ohci_hcd_alloc (void)
28 struct ohci_hcd *ohci;
30 ohci = (struct ohci_hcd *) kmalloc (sizeof *ohci, GFP_KERNEL);
32 memset (ohci, 0, sizeof (struct ohci_hcd));
33 ohci->hcd.product_desc = "OHCI Host Controller";
34 ohci->next_statechange = jiffies;
35 spin_lock_init (&ohci->lock);
36 INIT_LIST_HEAD (&ohci->pending);
37 INIT_WORK (&ohci->rh_resume, ohci_rh_resume, &ohci->hcd);
43 /*-------------------------------------------------------------------------*/
45 static int ohci_mem_init (struct ohci_hcd *ohci)
47 ohci->td_cache = dma_pool_create ("ohci_td", ohci->hcd.self.controller,
49 32 /* byte alignment */,
50 0 /* no page-crossing issues */);
53 ohci->ed_cache = dma_pool_create ("ohci_ed", ohci->hcd.self.controller,
55 16 /* byte alignment */,
56 0 /* no page-crossing issues */);
57 if (!ohci->ed_cache) {
58 dma_pool_destroy (ohci->td_cache);
64 static void ohci_mem_cleanup (struct ohci_hcd *ohci)
67 dma_pool_destroy (ohci->td_cache);
68 ohci->td_cache = NULL;
71 dma_pool_destroy (ohci->ed_cache);
72 ohci->ed_cache = NULL;
76 /*-------------------------------------------------------------------------*/
78 /* ohci "done list" processing needs this mapping */
79 static inline struct td *
80 dma_to_td (struct ohci_hcd *hc, dma_addr_t td_dma)
85 td = hc->td_hash [TD_HASH_FUNC(td_dma)];
86 while (td && td->td_dma != td_dma)
93 td_alloc (struct ohci_hcd *hc, int mem_flags)
98 td = dma_pool_alloc (hc->td_cache, mem_flags, &dma);
100 /* in case hc fetches it, make it look dead */
101 memset (td, 0, sizeof *td);
102 td->hwNextTD = cpu_to_hc32 (hc, dma);
104 /* hashed in td_fill */
110 td_free (struct ohci_hcd *hc, struct td *td)
112 struct td **prev = &hc->td_hash [TD_HASH_FUNC (td->td_dma)];
114 while (*prev && *prev != td)
115 prev = &(*prev)->td_hash;
118 else if ((td->hwINFO & cpu_to_hc32(hc, TD_DONE)) != 0)
119 ohci_dbg (hc, "no hash for td %p\n", td);
120 dma_pool_free (hc->td_cache, td, td->td_dma);
123 /*-------------------------------------------------------------------------*/
127 ed_alloc (struct ohci_hcd *hc, int mem_flags)
132 ed = dma_pool_alloc (hc->ed_cache, mem_flags, &dma);
134 memset (ed, 0, sizeof (*ed));
135 INIT_LIST_HEAD (&ed->td_list);
142 ed_free (struct ohci_hcd *hc, struct ed *ed)
144 dma_pool_free (hc->ed_cache, ed, ed->dma);