1/******************************************************************************
2 * rtl871x_io.c
3 *
4 * Copyright(c) 2007 - 2010 Realtek Corporation. All rights reserved.
5 * Linux device driver for RTL8192SU
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of version 2 of the GNU General Public License as
9 * published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
14 * more details.
15 *
16 * You should have received a copy of the GNU General Public License along with
17 * this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
19 *
20 * Modifications for inclusion into the Linux staging tree are
21 * Copyright(c) 2010 Larry Finger. All rights reserved.
22 *
23 * Contact information:
24 * WLAN FAE <wlanfae@realtek.com>
25 * Larry Finger <Larry.Finger@lwfinger.net>
26 *
27 ******************************************************************************/
28/*
29 *
30 * The purpose of rtl871x_io.c
31 *
32 * a. provides the API
33 * b. provides the protocol engine
34 * c. provides the software interface between caller and the hardware interface
35 *
36 * For r8712u, both sync/async operations are provided.
37 *
38 * Only sync read/write_mem operations are provided.
39 *
40 */
41
42#define _RTL871X_IO_C_
43
44#include "osdep_service.h"
45#include "drv_types.h"
46#include "rtl871x_io.h"
47#include "osdep_intf.h"
48#include "usb_ops.h"
49
50static uint _init_intf_hdl(struct _adapter *padapter,
51			   struct intf_hdl *pintf_hdl)
52{
53	struct	intf_priv	*pintf_priv;
54	void (*set_intf_option)(u32 *poption) = NULL;
55	void (*set_intf_funs)(struct intf_hdl *pintf_hdl);
56	void (*set_intf_ops)(struct _io_ops	*pops);
57	uint (*init_intf_priv)(struct intf_priv *pintfpriv);
58
59	set_intf_option = &(r8712_usb_set_intf_option);
60	set_intf_funs = &(r8712_usb_set_intf_funs);
61	set_intf_ops = &r8712_usb_set_intf_ops;
62	init_intf_priv = &r8712_usb_init_intf_priv;
63	pintf_priv = pintf_hdl->pintfpriv = kmalloc(sizeof(struct intf_priv),
64						    GFP_ATOMIC);
65	if (pintf_priv == NULL)
66		goto _init_intf_hdl_fail;
67	pintf_hdl->adapter = (u8 *)padapter;
68	set_intf_option(&pintf_hdl->intf_option);
69	set_intf_funs(pintf_hdl);
70	set_intf_ops(&pintf_hdl->io_ops);
71	pintf_priv->intf_dev = (u8 *)&(padapter->dvobjpriv);
72	if (init_intf_priv(pintf_priv) == _FAIL)
73		goto _init_intf_hdl_fail;
74	return _SUCCESS;
75_init_intf_hdl_fail:
76	kfree(pintf_priv);
77	return _FAIL;
78}
79
80static void _unload_intf_hdl(struct intf_priv *pintfpriv)
81{
82	void (*unload_intf_priv)(struct intf_priv *pintfpriv);
83
84	unload_intf_priv = &r8712_usb_unload_intf_priv;
85	unload_intf_priv(pintfpriv);
86	kfree(pintfpriv);
87}
88
89static uint register_intf_hdl(u8 *dev, struct intf_hdl *pintfhdl)
90{
91	struct _adapter *adapter = (struct _adapter *)dev;
92
93	pintfhdl->intf_option = 0;
94	pintfhdl->adapter = dev;
95	pintfhdl->intf_dev = (u8 *)&(adapter->dvobjpriv);
96	if (!_init_intf_hdl(adapter, pintfhdl))
97		goto register_intf_hdl_fail;
98	return _SUCCESS;
99register_intf_hdl_fail:
100	return false;
101}
102
103static  void unregister_intf_hdl(struct intf_hdl *pintfhdl)
104{
105	_unload_intf_hdl(pintfhdl->pintfpriv);
106	memset((u8 *)pintfhdl, 0, sizeof(struct intf_hdl));
107}
108
109uint r8712_alloc_io_queue(struct _adapter *adapter)
110{
111	u32 i;
112	struct io_queue *pio_queue;
113	struct io_req *pio_req;
114
115	pio_queue = kmalloc(sizeof(*pio_queue), GFP_ATOMIC);
116	if (pio_queue == NULL)
117		goto alloc_io_queue_fail;
118	INIT_LIST_HEAD(&pio_queue->free_ioreqs);
119	INIT_LIST_HEAD(&pio_queue->processing);
120	INIT_LIST_HEAD(&pio_queue->pending);
121	spin_lock_init(&pio_queue->lock);
122	pio_queue->pallocated_free_ioreqs_buf = kmalloc(NUM_IOREQ *
123						(sizeof(struct io_req)) + 4,
124						GFP_ATOMIC);
125	if ((pio_queue->pallocated_free_ioreqs_buf) == NULL)
126		goto alloc_io_queue_fail;
127	memset(pio_queue->pallocated_free_ioreqs_buf, 0,
128			(NUM_IOREQ * (sizeof(struct io_req)) + 4));
129	pio_queue->free_ioreqs_buf = pio_queue->pallocated_free_ioreqs_buf + 4
130			- ((addr_t)(pio_queue->pallocated_free_ioreqs_buf)
131			& 3);
132	pio_req = (struct io_req *)(pio_queue->free_ioreqs_buf);
133	for (i = 0; i < NUM_IOREQ; i++) {
134		INIT_LIST_HEAD(&pio_req->list);
135		list_add_tail(&pio_req->list, &pio_queue->free_ioreqs);
136		pio_req++;
137	}
138	if ((register_intf_hdl((u8 *)adapter, &(pio_queue->intf))) == _FAIL)
139		goto alloc_io_queue_fail;
140	adapter->pio_queue = pio_queue;
141	return _SUCCESS;
142alloc_io_queue_fail:
143	if (pio_queue) {
144		kfree(pio_queue->pallocated_free_ioreqs_buf);
145		kfree(pio_queue);
146	}
147	adapter->pio_queue = NULL;
148	return _FAIL;
149}
150
151void r8712_free_io_queue(struct _adapter *adapter)
152{
153	struct io_queue *pio_queue = (struct io_queue *)(adapter->pio_queue);
154
155	if (pio_queue) {
156		kfree(pio_queue->pallocated_free_ioreqs_buf);
157		adapter->pio_queue = NULL;
158		unregister_intf_hdl(&pio_queue->intf);
159		kfree(pio_queue);
160	}
161}
162