diff options
Diffstat (limited to 'drivers/usb/host/ohci-mem.c')
| -rw-r--r-- | drivers/usb/host/ohci-mem.c | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/drivers/usb/host/ohci-mem.c b/drivers/usb/host/ohci-mem.c new file mode 100644 index 000000000..c9e315c68 --- /dev/null +++ b/drivers/usb/host/ohci-mem.c @@ -0,0 +1,139 @@ +/* + * OHCI HCD (Host Controller Driver) for USB. + * + * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at> + * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net> + * + * This file is licenced under the GPL. + */ + +/*-------------------------------------------------------------------------*/ + +/* + * OHCI deals with three types of memory: + * - data used only by the HCD ... kmalloc is fine + * - async and periodic schedules, shared by HC and HCD ... these + * need to use dma_pool or dma_alloc_coherent + * - driver buffers, read/written by HC ... the hcd glue or the + * device driver provides us with dma addresses + * + * There's also "register" data, which is memory mapped. + * No memory seen by this driver (or any HCD) may be paged out. + */ + +/*-------------------------------------------------------------------------*/ + +static void ohci_hcd_init (struct ohci_hcd *ohci) +{ + ohci->next_statechange = jiffies; + spin_lock_init (&ohci->lock); + INIT_LIST_HEAD (&ohci->pending); + INIT_LIST_HEAD(&ohci->eds_in_use); +} + +/*-------------------------------------------------------------------------*/ + +static int ohci_mem_init (struct ohci_hcd *ohci) +{ + ohci->td_cache = dma_pool_create ("ohci_td", + ohci_to_hcd(ohci)->self.controller, + sizeof (struct td), + 32 /* byte alignment */, + 0 /* no page-crossing issues */); + if (!ohci->td_cache) + return -ENOMEM; + ohci->ed_cache = dma_pool_create ("ohci_ed", + ohci_to_hcd(ohci)->self.controller, + sizeof (struct ed), + 16 /* byte alignment */, + 0 /* no page-crossing issues */); + if (!ohci->ed_cache) { + dma_pool_destroy (ohci->td_cache); + return -ENOMEM; + } + return 0; +} + +static void ohci_mem_cleanup (struct ohci_hcd *ohci) +{ + if (ohci->td_cache) { + dma_pool_destroy (ohci->td_cache); + ohci->td_cache = NULL; + } + if (ohci->ed_cache) { + dma_pool_destroy (ohci->ed_cache); + ohci->ed_cache = NULL; + } +} + +/*-------------------------------------------------------------------------*/ + +/* ohci "done list" processing needs this mapping */ +static inline struct td * +dma_to_td (struct ohci_hcd *hc, dma_addr_t td_dma) +{ + struct td *td; + + td_dma &= TD_MASK; + td = hc->td_hash [TD_HASH_FUNC(td_dma)]; + while (td && td->td_dma != td_dma) + td = td->td_hash; + return td; +} + +/* TDs ... */ +static struct td * +td_alloc (struct ohci_hcd *hc, gfp_t mem_flags) +{ + dma_addr_t dma; + struct td *td; + + td = dma_pool_alloc (hc->td_cache, mem_flags, &dma); + if (td) { + /* in case hc fetches it, make it look dead */ + memset (td, 0, sizeof *td); + td->hwNextTD = cpu_to_hc32 (hc, dma); + td->td_dma = dma; + /* hashed in td_fill */ + } + return td; +} + +static void +td_free (struct ohci_hcd *hc, struct td *td) +{ + struct td **prev = &hc->td_hash [TD_HASH_FUNC (td->td_dma)]; + + while (*prev && *prev != td) + prev = &(*prev)->td_hash; + if (*prev) + *prev = td->td_hash; + else if ((td->hwINFO & cpu_to_hc32(hc, TD_DONE)) != 0) + ohci_dbg (hc, "no hash for td %p\n", td); + dma_pool_free (hc->td_cache, td, td->td_dma); +} + +/*-------------------------------------------------------------------------*/ + +/* EDs ... */ +static struct ed * +ed_alloc (struct ohci_hcd *hc, gfp_t mem_flags) +{ + dma_addr_t dma; + struct ed *ed; + + ed = dma_pool_alloc (hc->ed_cache, mem_flags, &dma); + if (ed) { + memset (ed, 0, sizeof (*ed)); + INIT_LIST_HEAD (&ed->td_list); + ed->dma = dma; + } + return ed; +} + +static void +ed_free (struct ohci_hcd *hc, struct ed *ed) +{ + dma_pool_free (hc->ed_cache, ed, ed->dma); +} + |