/* * 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 pci_pool or pci_alloc_consistent * - 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 pagable. */ /*-------------------------------------------------------------------------*/ /* * Allocator / cleanup for the per device structure * Called by hcd init / removal code */ static struct usb_hcd *ehci_hcd_alloc (void) { struct ehci_hcd *ehci; ehci = (struct ehci_hcd *) kmalloc (sizeof (struct ehci_hcd), GFP_KERNEL); if (ehci != 0) { memset (ehci, 0, sizeof (struct ehci_hcd)); return &ehci->hcd; } return 0; } static void ehci_hcd_free (struct usb_hcd *hcd) { kfree (hcd_to_ehci (hcd)); } /*-------------------------------------------------------------------------*/ /* Allocate the key transfer structures from the previously allocated pool */ static struct ehci_qtd *ehci_qtd_alloc (struct ehci_hcd *ehci, int flags) { struct ehci_qtd *qtd; dma_addr_t dma; qtd = pci_pool_alloc (ehci->qtd_pool, flags, &dma); if (qtd != 0) { memset (qtd, 0, sizeof *qtd); qtd->qtd_dma = dma; qtd->hw_next = EHCI_LIST_END; qtd->hw_alt_next = EHCI_LIST_END; INIT_LIST_HEAD (&qtd->qtd_list); } return qtd; } static inline void ehci_qtd_free (struct ehci_hcd *ehci, struct ehci_qtd *qtd) { pci_pool_free (ehci->qtd_pool, qtd, qtd->qtd_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 *) pci_pool_alloc (ehci->qh_pool, flags, &dma); if (qh) { memset (qh, 0, sizeof *qh); atomic_set (&qh->refcount, 1); qh->qh_dma = dma; // INIT_LIST_HEAD (&qh->qh_list); INIT_LIST_HEAD (&qh->qtd_list); } return qh; } /* to share a qh (cpu threads, or hc) */ static inline struct ehci_qh *qh_put (/* ehci, */ struct ehci_qh *qh) { // dbg ("put %p (%d++)", qh, qh->refcount.counter); atomic_inc (&qh->refcount); return qh; } static void qh_unput (struct ehci_hcd *ehci, struct ehci_qh *qh) { // dbg ("unput %p (--%d)", qh, qh->refcount.counter); if (!atomic_dec_and_test (&qh->refcount)) return; /* clean qtds first, and know this is not linked */ if (!list_empty (&qh->qtd_list) || qh->qh_next.ptr) { dbg ("unused qh not empty!"); BUG (); } pci_pool_free (ehci->qh_pool, qh, qh->qh_dma); } /*-------------------------------------------------------------------------*/ /* 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) { /* PCI consistent memory and pools */ if (ehci->qtd_pool) pci_pool_destroy (ehci->qtd_pool); ehci->qtd_pool = 0; if (ehci->qh_pool) { pci_pool_destroy (ehci->qh_pool); ehci->qh_pool = 0; } if (ehci->itd_pool) pci_pool_destroy (ehci->itd_pool); ehci->itd_pool = 0; if (ehci->sitd_pool) pci_pool_destroy (ehci->sitd_pool); ehci->sitd_pool = 0; if (ehci->periodic) pci_free_consistent (ehci->hcd.pdev, ehci->periodic_size * sizeof (u32), ehci->periodic, ehci->periodic_dma); ehci->periodic = 0; /* shadow periodic table */ if (ehci->pshadow) kfree (ehci->pshadow); ehci->pshadow = 0; } /* 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 = pci_pool_create ("ehci_qtd", ehci->hcd.pdev, sizeof (struct ehci_qtd), 32 /* byte alignment (for hw parts) */, 4096 /* can't cross 4K */, flags); if (!ehci->qtd_pool) { dbg ("no qtd pool"); ehci_mem_cleanup (ehci); return -ENOMEM; } /* QH for control/bulk/intr transfers */ ehci->qh_pool = pci_pool_create ("ehci_qh", ehci->hcd.pdev, sizeof (struct ehci_qh), 32 /* byte alignment (for hw parts) */, 4096 /* can't cross 4K */, flags); if (!ehci->qh_pool) { dbg ("no qh pool"); ehci_mem_cleanup (ehci); return -ENOMEM; } /* ITD for high speed ISO transfers */ ehci->itd_pool = pci_pool_create ("ehci_itd", ehci->hcd.pdev, sizeof (struct ehci_itd), 32 /* byte alignment (for hw parts) */, 4096 /* can't cross 4K */, flags); if (!ehci->itd_pool) { dbg ("no itd pool"); ehci_mem_cleanup (ehci); return -ENOMEM; } /* SITD for full/low speed split ISO transfers */ ehci->sitd_pool = pci_pool_create ("ehci_sitd", ehci->hcd.pdev, sizeof (struct ehci_sitd), 32 /* byte alignment (for hw parts) */, 4096 /* can't cross 4K */, flags); if (!ehci->sitd_pool) { dbg ("no sitd pool"); ehci_mem_cleanup (ehci); return -ENOMEM; } /* Hardware periodic table */ ehci->periodic = (u32 *) pci_alloc_consistent (ehci->hcd.pdev, ehci->periodic_size * sizeof (u32), &ehci->periodic_dma); if (ehci->periodic == 0) { dbg ("no hw periodic table"); ehci_mem_cleanup (ehci); return -ENOMEM; } 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 & ~EHCI_SLAB_FLAGS); if (ehci->pshadow == 0) { dbg ("no shadow periodic table"); ehci_mem_cleanup (ehci); return -ENOMEM; } memset (ehci->pshadow, 0, ehci->periodic_size * sizeof (void *)); return 0; }