[adm5120] experimental support for 2.6.27

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@12863 3c298f89-4303-0410-b956-a3cf2f4a3e73

target/linux/adm5120/files/drivers/usb/host/adm5120-mem.c

@@ -0,0 +1,202 @@
+/*
+ * ADM5120 HCD (Host Controller Driver) for USB
+ *
+ * Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
+ *
+ * This file was derived from: drivers/usb/host/ohci-mem.c
+ *   (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
+ *   (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
+ *
+ *  This program is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License version 2 as published
+ *  by the Free Software Foundation.
+ *
+ */
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * OHCI deals with 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 ... the hcd glue or the
+ *	  device driver provides us with dma addresses
+ *
+ * There's also "register" data, which is memory mapped.
+ * No memory seen by this driver (or any HCD) may be paged out.
+ */
+
+/*-------------------------------------------------------------------------*/
+
+static void admhc_hcd_init(struct admhcd *ahcd)
+{
+	ahcd->next_statechange = jiffies;
+	spin_lock_init(&ahcd->lock);
+	INIT_LIST_HEAD(&ahcd->pending);
+}
+
+/*-------------------------------------------------------------------------*/
+
+static int admhc_mem_init(struct admhcd *ahcd)
+{
+	ahcd->td_cache = dma_pool_create("admhc_td",
+		admhcd_to_hcd(ahcd)->self.controller,
+		sizeof(struct td),
+		TD_ALIGN, /* byte alignment */
+		0 /* no page-crossing issues */
+		);
+	if (!ahcd->td_cache)
+		goto err;
+
+	ahcd->ed_cache = dma_pool_create("admhc_ed",
+		admhcd_to_hcd(ahcd)->self.controller,
+		sizeof(struct ed),
+		ED_ALIGN, /* byte alignment */
+		0 /* no page-crossing issues */
+		);
+	if (!ahcd->ed_cache)
+		goto err_td_cache;
+
+	return 0;
+
+err_td_cache:
+	dma_pool_destroy(ahcd->td_cache);
+	ahcd->td_cache = NULL;
+err:
+	return -ENOMEM;
+}
+
+static void admhc_mem_cleanup(struct admhcd *ahcd)
+{
+	if (ahcd->td_cache) {
+		dma_pool_destroy(ahcd->td_cache);
+		ahcd->td_cache = NULL;
+	}
+
+	if (ahcd->ed_cache) {
+		dma_pool_destroy(ahcd->ed_cache);
+		ahcd->ed_cache = NULL;
+	}
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* ahcd "done list" processing needs this mapping */
+static inline struct td *dma_to_td(struct admhcd *ahcd, dma_addr_t td_dma)
+{
+	struct td *td;
+
+	td_dma &= TD_MASK;
+	td = ahcd->td_hash[TD_HASH_FUNC(td_dma)];
+	while (td && td->td_dma != td_dma)
+		td = td->td_hash;
+
+	return td;
+}
+
+/* TDs ... */
+static struct td *td_alloc(struct admhcd *ahcd, gfp_t mem_flags)
+{
+	dma_addr_t	dma;
+	struct td	*td;
+
+	td = dma_pool_alloc(ahcd->td_cache, mem_flags, &dma);
+	if (!td)
+		return NULL;
+
+	/* in case ahcd fetches it, make it look dead */
+	memset(td, 0, sizeof *td);
+	td->hwNextTD = cpu_to_hc32(ahcd, dma);
+	td->td_dma = dma;
+	/* hashed in td_fill */
+
+	return td;
+}
+
+static void td_free(struct admhcd *ahcd, struct td *td)
+{
+	struct td **prev = &ahcd->td_hash[TD_HASH_FUNC(td->td_dma)];
+
+	while (*prev && *prev != td)
+		prev = &(*prev)->td_hash;
+	if (*prev)
+		*prev = td->td_hash;
+#if 0
+	/* TODO: remove */
+	else if ((td->hwINFO & cpu_to_hc32(ahcd, TD_DONE)) != 0)
+		admhc_dbg (ahcd, "no hash for td %p\n", td);
+#else
+	else if ((td->flags & TD_FLAG_DONE) != 0)
+		admhc_dbg (ahcd, "no hash for td %p\n", td);
+#endif
+	dma_pool_free(ahcd->td_cache, td, td->td_dma);
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* EDs ... */
+static struct ed *ed_alloc(struct admhcd *ahcd, gfp_t mem_flags)
+{
+	dma_addr_t	dma;
+	struct ed	*ed;
+
+	ed = dma_pool_alloc(ahcd->ed_cache, mem_flags, &dma);
+	if (!ed)
+		return NULL;
+
+	memset(ed, 0, sizeof(*ed));
+	ed->dma = dma;
+
+	INIT_LIST_HEAD(&ed->td_list);
+	INIT_LIST_HEAD(&ed->urb_list);
+
+	return ed;
+}
+
+static void ed_free(struct admhcd *ahcd, struct ed *ed)
+{
+	dma_pool_free(ahcd->ed_cache, ed, ed->dma);
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* URB priv ... */
+static void urb_priv_free(struct admhcd *ahcd, struct urb_priv *urb_priv)
+{
+	int i;
+
+	for (i = 0; i < urb_priv->td_cnt; i++)
+		if (urb_priv->td[i])
+			td_free(ahcd, urb_priv->td[i]);
+
+	list_del(&urb_priv->pending);
+	kfree(urb_priv);
+}
+
+static struct urb_priv *urb_priv_alloc(struct admhcd *ahcd, int num_tds,
+		gfp_t mem_flags)
+{
+	struct urb_priv	*priv;
+
+	/* allocate the private part of the URB */
+	priv = kzalloc(sizeof(*priv) + sizeof(struct td) * num_tds, mem_flags);
+	if (!priv)
+		goto err;
+
+	/* allocate the TDs (deferring hash chain updates) */
+	for (priv->td_cnt = 0; priv->td_cnt < num_tds; priv->td_cnt++) {
+		priv->td[priv->td_cnt] = td_alloc(ahcd, mem_flags);
+		if (priv->td[priv->td_cnt] == NULL)
+			goto err_free;
+	}
+
+	INIT_LIST_HEAD(&priv->pending);
+
+	return priv;
+
+err_free:
+	urb_priv_free(ahcd, priv);
+err:
+	return NULL;
+}