Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

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 000000000000..9938697ff361
--- /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;
+}