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";
39 static void ohci_hcd_free (struct usb_hcd *hcd)
41 kfree (hcd_to_ohci (hcd));
44 /*-------------------------------------------------------------------------*/
46 static int ohci_mem_init (struct ohci_hcd *ohci)
48 ohci->td_cache = dma_pool_create ("ohci_td", ohci->hcd.self.controller,
50 32 /* byte alignment */,
51 0 /* no page-crossing issues */);
54 ohci->ed_cache = dma_pool_create ("ohci_ed", ohci->hcd.self.controller,
56 16 /* byte alignment */,
57 0 /* no page-crossing issues */);
58 if (!ohci->ed_cache) {
59 dma_pool_destroy (ohci->td_cache);
65 static void ohci_mem_cleanup (struct ohci_hcd *ohci)
68 dma_pool_destroy (ohci->td_cache);
72 dma_pool_destroy (ohci->ed_cache);
77 /*-------------------------------------------------------------------------*/
79 /* ohci "done list" processing needs this mapping */
80 static inline struct td *
81 dma_to_td (struct ohci_hcd *hc, dma_addr_t td_dma)
86 td = hc->td_hash [TD_HASH_FUNC(td_dma)];
87 while (td && td->td_dma != td_dma)
94 td_alloc (struct ohci_hcd *hc, int mem_flags)
99 td = dma_pool_alloc (hc->td_cache, mem_flags, &dma);
101 /* in case hc fetches it, make it look dead */
102 memset (td, 0, sizeof *td);
103 td->hwNextTD = cpu_to_le32 (dma);
105 /* hashed in td_fill */
111 td_free (struct ohci_hcd *hc, struct td *td)
113 struct td **prev = &hc->td_hash [TD_HASH_FUNC (td->td_dma)];
115 while (*prev && *prev != td)
116 prev = &(*prev)->td_hash;
119 else if ((td->hwINFO & TD_DONE) != 0)
120 ohci_dbg (hc, "no hash for td %p\n", td);
121 dma_pool_free (hc->td_cache, td, td->td_dma);
124 /*-------------------------------------------------------------------------*/
128 ed_alloc (struct ohci_hcd *hc, int mem_flags)
133 ed = dma_pool_alloc (hc->ed_cache, mem_flags, &dma);
135 memset (ed, 0, sizeof (*ed));
136 INIT_LIST_HEAD (&ed->td_list);
143 ed_free (struct ohci_hcd *hc, struct ed *ed)
145 dma_pool_free (hc->ed_cache, ed, ed->dma);