diff options
Diffstat (limited to 'drivers/usb/host/ehci-mem.c')
| -rw-r--r-- | drivers/usb/host/ehci-mem.c | 237 |
1 files changed, 237 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci-mem.c b/drivers/usb/host/ehci-mem.c new file mode 100644 index 00000000000..9938697ff36 --- /dev/null +++ b/drivers/usb/host/ehci-mem.c @@ -0,0 +1,237 @@ +/* + * Copyright (c) 2001 by David Brownell + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY + * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software Foundation, + * Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +/* this file is part of ehci-hcd.c */ + +/*-------------------------------------------------------------------------*/ + +/* + * There's basically 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 ... single shot DMA mapped + * + * There's also PCI "register" data, which is memory mapped. + * No memory seen by this driver is pageable. + */ + +/*-------------------------------------------------------------------------*/ + +/* Allocate the key transfer structures from the previously allocated pool */ + +static inline void ehci_qtd_init (struct ehci_qtd *qtd, dma_addr_t dma) +{ + memset (qtd, 0, sizeof *qtd); + qtd->qtd_dma = dma; + qtd->hw_token = cpu_to_le32 (QTD_STS_HALT); + qtd->hw_next = EHCI_LIST_END; + qtd->hw_alt_next = EHCI_LIST_END; + INIT_LIST_HEAD (&qtd->qtd_list); +} + +static struct ehci_qtd *ehci_qtd_alloc (struct ehci_hcd *ehci, int flags) +{ + struct ehci_qtd *qtd; + dma_addr_t dma; + + qtd = dma_pool_alloc (ehci->qtd_pool, flags, &dma); + if (qtd != NULL) { + ehci_qtd_init (qtd, dma); + } + return qtd; +} + +static inline void ehci_qtd_free (struct ehci_hcd *ehci, struct ehci_qtd *qtd) +{ + dma_pool_free (ehci->qtd_pool, qtd, qtd->qtd_dma); +} + + +static void qh_destroy (struct kref *kref) +{ + struct ehci_qh *qh = container_of(kref, struct ehci_qh, kref); + struct ehci_hcd *ehci = qh->ehci; + + /* clean qtds first, and know this is not linked */ + if (!list_empty (&qh->qtd_list) || qh->qh_next.ptr) { + ehci_dbg (ehci, "unused qh not empty!\n"); + BUG (); + } + if (qh->dummy) + ehci_qtd_free (ehci, qh->dummy); + usb_put_dev (qh->dev); + dma_pool_free (ehci->qh_pool, qh, qh->qh_dma); +} + +static struct ehci_qh *ehci_qh_alloc (struct ehci_hcd *ehci, int flags) +{ + struct ehci_qh *qh; + dma_addr_t dma; + + qh = (struct ehci_qh *) + dma_pool_alloc (ehci->qh_pool, flags, &dma); + if (!qh) + return qh; + + memset (qh, 0, sizeof *qh); + kref_init(&qh->kref); + qh->ehci = ehci; + qh->qh_dma = dma; + // INIT_LIST_HEAD (&qh->qh_list); + INIT_LIST_HEAD (&qh->qtd_list); + + /* dummy td enables safe urb queuing */ + qh->dummy = ehci_qtd_alloc (ehci, flags); + if (qh->dummy == NULL) { + ehci_dbg (ehci, "no dummy td\n"); + dma_pool_free (ehci->qh_pool, qh, qh->qh_dma); + qh = NULL; + } + return qh; +} + +/* to share a qh (cpu threads, or hc) */ +static inline struct ehci_qh *qh_get (struct ehci_qh *qh) +{ + kref_get(&qh->kref); + return qh; +} + +static inline void qh_put (struct ehci_qh *qh) +{ + kref_put(&qh->kref, qh_destroy); +} + +/*-------------------------------------------------------------------------*/ + +/* The queue heads and transfer descriptors are managed from pools tied + * to each of the "per device" structures. + * This is the initialisation and cleanup code. + */ + +static void ehci_mem_cleanup (struct ehci_hcd *ehci) +{ + if (ehci->async) + qh_put (ehci->async); + ehci->async = NULL; + + /* DMA consistent memory and pools */ + if (ehci->qtd_pool) + dma_pool_destroy (ehci->qtd_pool); + ehci->qtd_pool = NULL; + + if (ehci->qh_pool) { + dma_pool_destroy (ehci->qh_pool); + ehci->qh_pool = NULL; + } + + if (ehci->itd_pool) + dma_pool_destroy (ehci->itd_pool); + ehci->itd_pool = NULL; + + if (ehci->sitd_pool) + dma_pool_destroy (ehci->sitd_pool); + ehci->sitd_pool = NULL; + + if (ehci->periodic) + dma_free_coherent (ehci_to_hcd(ehci)->self.controller, + ehci->periodic_size * sizeof (u32), + ehci->periodic, ehci->periodic_dma); + ehci->periodic = NULL; + + /* shadow periodic table */ + if (ehci->pshadow) + kfree (ehci->pshadow); + ehci->pshadow = NULL; +} + +/* remember to add cleanup code (above) if you add anything here */ +static int ehci_mem_init (struct ehci_hcd *ehci, int flags) +{ + int i; + + /* QTDs for control/bulk/intr transfers */ + ehci->qtd_pool = dma_pool_create ("ehci_qtd", + ehci_to_hcd(ehci)->self.controller, + sizeof (struct ehci_qtd), + 32 /* byte alignment (for hw parts) */, + 4096 /* can't cross 4K */); + if (!ehci->qtd_pool) { + goto fail; + } + + /* QHs for control/bulk/intr transfers */ + ehci->qh_pool = dma_pool_create ("ehci_qh", + ehci_to_hcd(ehci)->self.controller, + sizeof (struct ehci_qh), + 32 /* byte alignment (for hw parts) */, + 4096 /* can't cross 4K */); + if (!ehci->qh_pool) { + goto fail; + } + ehci->async = ehci_qh_alloc (ehci, flags); + if (!ehci->async) { + goto fail; + } + + /* ITD for high speed ISO transfers */ + ehci->itd_pool = dma_pool_create ("ehci_itd", + ehci_to_hcd(ehci)->self.controller, + sizeof (struct ehci_itd), + 32 /* byte alignment (for hw parts) */, + 4096 /* can't cross 4K */); + if (!ehci->itd_pool) { + goto fail; + } + + /* SITD for full/low speed split ISO transfers */ + ehci->sitd_pool = dma_pool_create ("ehci_sitd", + ehci_to_hcd(ehci)->self.controller, + sizeof (struct ehci_sitd), + 32 /* byte alignment (for hw parts) */, + 4096 /* can't cross 4K */); + if (!ehci->sitd_pool) { + goto fail; + } + + /* Hardware periodic table */ + ehci->periodic = (__le32 *) + dma_alloc_coherent (ehci_to_hcd(ehci)->self.controller, + ehci->periodic_size * sizeof(__le32), + &ehci->periodic_dma, 0); + if (ehci->periodic == NULL) { + goto fail; + } + for (i = 0; i < ehci->periodic_size; i++) + ehci->periodic [i] = EHCI_LIST_END; + + /* software shadow of hardware table */ + ehci->pshadow = kmalloc (ehci->periodic_size * sizeof (void *), flags); + if (ehci->pshadow == NULL) { + goto fail; + } + memset (ehci->pshadow, 0, ehci->periodic_size * sizeof (void *)); + + return 0; + +fail: + ehci_dbg (ehci, "couldn't init memory\n"); + ehci_mem_cleanup (ehci); + return -ENOMEM; +} |