ohci-mem.rar_OHCI driver

/* * 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); } /*-------------------------------------------------------------------------*/ 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); }