patch-2.4.21 linux-2.4.21/drivers/usb/host/ehci-mem.c

• Lines: 253
• Date: 2003-06-13 07:51:36.000000000 -0700
• Orig file: linux-2.4.20/drivers/usb/host/ehci-mem.c
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.20/drivers/usb/host/ehci-mem.c linux-2.4.21/drivers/usb/host/ehci-mem.c
@@ -0,0 +1,252 @@
+/*
+ * 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 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 = pci_pool_alloc (ehci->qtd_pool, flags, &dma);
+	if (qtd != 0) {
+		ehci_qtd_init (qtd, dma);
+	}
+	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)
+		return 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);
+
+	/* dummy td enables safe urb queuing */
+	qh->dummy = ehci_qtd_alloc (ehci, flags);
+	if (qh->dummy == 0) {
+		ehci_dbg (ehci, "no dummy td\n");
+		pci_pool_free (ehci->qh_pool, qh, qh->qh_dma);
+		qh = 0;
+	}
+	return qh;
+}
+
+/* to share a qh (cpu threads, or hc) */
+static inline struct ehci_qh *qh_get (/* ehci, */ struct ehci_qh *qh)
+{
+	atomic_inc (&qh->refcount);
+	return qh;
+}
+
+static void qh_put (struct ehci_hcd *ehci, struct ehci_qh *qh)
+{
+	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) {
+		ehci_dbg (ehci, "unused qh not empty!\n");
+		BUG ();
+	}
+	if (qh->dummy)
+		ehci_qtd_free (ehci, qh->dummy);
+	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)
+{
+	if (ehci->async)
+		qh_put (ehci, ehci->async);
+	ehci->async = 0;
+
+	/* 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) {
+		goto fail;
+	}
+
+	/* QHs 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) {
+		goto fail;
+	}
+	ehci->async = ehci_qh_alloc (ehci, flags);
+	if (!ehci->async) {
+		goto fail;
+	}
+
+	/* 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) {
+		goto fail;
+	}
+
+	/* 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) {
+		goto fail;
+	}
+
+	/* Hardware periodic table */
+	ehci->periodic = (u32 *)
+		pci_alloc_consistent (ehci->hcd.pdev,
+			ehci->periodic_size * sizeof (u32),
+			&ehci->periodic_dma);
+	if (ehci->periodic == 0) {
+		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 == 0) {
+		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;
+}