2 * ADM5120 HCD (Host Controller Driver) for USB
4 * Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
6 * This file was derived from: drivers/usb/host/ohci-mem.c
7 * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
8 * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License version 2 as published
12 * by the Free Software Foundation.
16 /*-------------------------------------------------------------------------*/
19 * OHCI deals with three types of memory:
20 * - data used only by the HCD ... kmalloc is fine
21 * - async and periodic schedules, shared by HC and HCD ... these
22 * need to use dma_pool or dma_alloc_coherent
23 * - driver buffers, read/written by HC ... the hcd glue or the
24 * device driver provides us with dma addresses
26 * There's also "register" data, which is memory mapped.
27 * No memory seen by this driver (or any HCD) may be paged out.
30 /*-------------------------------------------------------------------------*/
32 static void admhc_hcd_init(struct admhcd *ahcd)
34 ahcd->next_statechange = jiffies;
35 spin_lock_init(&ahcd->lock);
36 INIT_LIST_HEAD(&ahcd->pending);
39 /*-------------------------------------------------------------------------*/
41 static int admhc_mem_init(struct admhcd *ahcd)
43 ahcd->td_cache = dma_pool_create("admhc_td",
44 admhcd_to_hcd(ahcd)->self.controller,
46 TD_ALIGN, /* byte alignment */
47 0 /* no page-crossing issues */
52 ahcd->ed_cache = dma_pool_create("admhc_ed",
53 admhcd_to_hcd(ahcd)->self.controller,
55 ED_ALIGN, /* byte alignment */
56 0 /* no page-crossing issues */
64 dma_pool_destroy(ahcd->td_cache);
65 ahcd->td_cache = NULL;
70 static void admhc_mem_cleanup(struct admhcd *ahcd)
73 dma_pool_destroy(ahcd->td_cache);
74 ahcd->td_cache = NULL;
78 dma_pool_destroy(ahcd->ed_cache);
79 ahcd->ed_cache = NULL;
83 /*-------------------------------------------------------------------------*/
85 /* ahcd "done list" processing needs this mapping */
86 static inline struct td *dma_to_td(struct admhcd *ahcd, dma_addr_t td_dma)
91 td = ahcd->td_hash[TD_HASH_FUNC(td_dma)];
92 while (td && td->td_dma != td_dma)
99 static struct td *td_alloc(struct admhcd *ahcd, gfp_t mem_flags)
104 td = dma_pool_alloc(ahcd->td_cache, mem_flags, &dma);
108 /* in case ahcd fetches it, make it look dead */
109 memset(td, 0, sizeof *td);
110 td->hwNextTD = cpu_to_hc32(ahcd, dma);
112 /* hashed in td_fill */
117 static void td_free(struct admhcd *ahcd, struct td *td)
119 struct td **prev = &ahcd->td_hash[TD_HASH_FUNC(td->td_dma)];
121 while (*prev && *prev != td)
122 prev = &(*prev)->td_hash;
127 else if ((td->hwINFO & cpu_to_hc32(ahcd, TD_DONE)) != 0)
128 admhc_dbg(ahcd, "no hash for td %p\n", td);
130 else if ((td->flags & TD_FLAG_DONE) != 0)
131 admhc_dbg(ahcd, "no hash for td %p\n", td);
133 dma_pool_free(ahcd->td_cache, td, td->td_dma);
136 /*-------------------------------------------------------------------------*/
139 static struct ed *ed_alloc(struct admhcd *ahcd, gfp_t mem_flags)
144 ed = dma_pool_alloc(ahcd->ed_cache, mem_flags, &dma);
148 memset(ed, 0, sizeof(*ed));
151 INIT_LIST_HEAD(&ed->td_list);
152 INIT_LIST_HEAD(&ed->urb_list);
157 static void ed_free(struct admhcd *ahcd, struct ed *ed)
159 dma_pool_free(ahcd->ed_cache, ed, ed->dma);
162 /*-------------------------------------------------------------------------*/
165 static void urb_priv_free(struct admhcd *ahcd, struct urb_priv *urb_priv)
169 for (i = 0; i < urb_priv->td_cnt; i++)
171 td_free(ahcd, urb_priv->td[i]);
173 list_del(&urb_priv->pending);
177 static struct urb_priv *urb_priv_alloc(struct admhcd *ahcd, int num_tds,
180 struct urb_priv *priv;
182 /* allocate the private part of the URB */
183 priv = kzalloc(sizeof(*priv) + sizeof(struct td) * num_tds, mem_flags);
187 /* allocate the TDs (deferring hash chain updates) */
188 for (priv->td_cnt = 0; priv->td_cnt < num_tds; priv->td_cnt++) {
189 priv->td[priv->td_cnt] = td_alloc(ahcd, mem_flags);
190 if (priv->td[priv->td_cnt] == NULL)
194 INIT_LIST_HEAD(&priv->pending);
199 urb_priv_free(ahcd, priv);