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168 lines
3.7 KiB
C
168 lines
3.7 KiB
C
/*
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* OHCI HCD (Host Controller Driver) for USB.
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*
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* (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
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* (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
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*
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* This file is licenced under the GPL.
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*/
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/*-------------------------------------------------------------------------*/
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/*
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* OHCI deals with three types of memory:
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* - data used only by the HCD ... kmalloc is fine
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* - async and periodic schedules, shared by HC and HCD ... these
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* need to use dma_pool or dma_alloc_coherent
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* - driver buffers, read/written by HC ... the hcd glue or the
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* device driver provides us with dma addresses
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*
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* There's also "register" data, which is memory mapped.
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* No memory seen by this driver (or any HCD) may be paged out.
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*/
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/*-------------------------------------------------------------------------*/
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static void admhc_hcd_init(struct admhcd *ahcd)
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{
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ahcd->next_statechange = jiffies;
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spin_lock_init(&ahcd->lock);
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}
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/*-------------------------------------------------------------------------*/
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static int admhc_mem_init(struct admhcd *ahcd)
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{
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ahcd->td_cache = dma_pool_create("admhc_td",
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admhcd_to_hcd(ahcd)->self.controller,
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sizeof(struct td),
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TD_ALIGN, /* byte alignment */
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0 /* no page-crossing issues */
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);
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if (!ahcd->td_cache)
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goto err;
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ahcd->ed_cache = dma_pool_create("admhc_ed",
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admhcd_to_hcd(ahcd)->self.controller,
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sizeof(struct ed),
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ED_ALIGN, /* byte alignment */
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0 /* no page-crossing issues */
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);
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if (!ahcd->ed_cache)
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goto err_td_cache;
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return 0;
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err_td_cache:
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dma_pool_destroy(ahcd->td_cache);
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ahcd->td_cache = NULL;
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err:
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return -ENOMEM;
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}
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static void admhc_mem_cleanup(struct admhcd *ahcd)
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{
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if (ahcd->td_cache) {
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dma_pool_destroy(ahcd->td_cache);
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ahcd->td_cache = NULL;
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}
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if (ahcd->ed_cache) {
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dma_pool_destroy(ahcd->ed_cache);
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ahcd->ed_cache = NULL;
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}
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}
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/*-------------------------------------------------------------------------*/
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/* TDs ... */
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static struct td *td_alloc(struct admhcd *ahcd, gfp_t mem_flags)
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{
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dma_addr_t dma;
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struct td *td;
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td = dma_pool_alloc(ahcd->td_cache, mem_flags, &dma);
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if (!td)
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return NULL;
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/* in case ahcd fetches it, make it look dead */
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memset(td, 0, sizeof *td);
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td->td_dma = dma;
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return td;
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}
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static void td_free(struct admhcd *ahcd, struct td *td)
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{
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dma_pool_free(ahcd->td_cache, td, td->td_dma);
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}
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/*-------------------------------------------------------------------------*/
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/* EDs ... */
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static struct ed *ed_alloc(struct admhcd *ahcd, gfp_t mem_flags)
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{
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dma_addr_t dma;
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struct ed *ed;
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ed = dma_pool_alloc(ahcd->ed_cache, mem_flags, &dma);
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if (!ed)
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return NULL;
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memset(ed, 0, sizeof(*ed));
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ed->dma = dma;
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INIT_LIST_HEAD(&ed->urb_pending);
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return ed;
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}
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static void ed_free(struct admhcd *ahcd, struct ed *ed)
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{
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dma_pool_free(ahcd->ed_cache, ed, ed->dma);
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}
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/*-------------------------------------------------------------------------*/
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/* URB priv ... */
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static void urb_priv_free(struct admhcd *ahcd, struct urb_priv *urb_priv)
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{
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int i;
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for (i = 0; i < urb_priv->td_cnt; i++)
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if (urb_priv->td[i])
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td_free(ahcd, urb_priv->td[i]);
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kfree(urb_priv);
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}
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static struct urb_priv *urb_priv_alloc(struct admhcd *ahcd, int num_tds,
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gfp_t mem_flags)
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{
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struct urb_priv *priv;
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int i;
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/* allocate the private part of the URB */
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priv = kzalloc(sizeof(*priv) + sizeof(struct td) * num_tds, mem_flags);
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if (!priv)
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goto err;
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/* allocate the TDs (deferring hash chain updates) */
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for (i = 0; i < num_tds; i++) {
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priv->td[i] = td_alloc(ahcd, mem_flags);
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if (priv->td[i] == NULL)
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goto err_free;
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priv->td[i]->index = i;
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}
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INIT_LIST_HEAD(&priv->pending);
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priv->td_cnt = num_tds;
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return priv;
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err_free:
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urb_priv_free(ahcd, priv);
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err:
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return NULL;
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}
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