1// SPDX-License-Identifier: GPL-2.0
2/******************************************************************************
3 * rtl871x_io.c
4 *
5 * Copyright(c) 2007 - 2010 Realtek Corporation. All rights reserved.
6 * Linux device driver for RTL8192SU
7 *
8 * Modifications for inclusion into the Linux staging tree are
9 * Copyright(c) 2010 Larry Finger. All rights reserved.
10 *
11 * Contact information:
12 * WLAN FAE <wlanfae@realtek.com>
13 * Larry Finger <Larry.Finger@lwfinger.net>
14 *
15 ******************************************************************************/
16/*
17 *
18 * The purpose of rtl871x_io.c
19 *
20 * a. provides the API
21 * b. provides the protocol engine
22 * c. provides the software interface between caller and the hardware interface
23 *
24 * For r8712u, both sync/async operations are provided.
25 *
26 * Only sync read/write_mem operations are provided.
27 *
28 */
29
30#define _RTL871X_IO_C_
31
32#include "osdep_service.h"
33#include "drv_types.h"
34#include "rtl871x_io.h"
35#include "osdep_intf.h"
36#include "usb_ops.h"
37
38static uint _init_intf_hdl(struct _adapter *padapter,
39			   struct intf_hdl *pintf_hdl)
40{
41	struct	intf_priv	*pintf_priv;
42	void (*set_intf_option)(u32 *poption) = NULL;
43	void (*set_intf_funs)(struct intf_hdl *pintf_hdl);
44	void (*set_intf_ops)(struct _io_ops	*pops);
45	uint (*init_intf_priv)(struct intf_priv *pintfpriv);
46
47	set_intf_option = &(r8712_usb_set_intf_option);
48	set_intf_funs = &(r8712_usb_set_intf_funs);
49	set_intf_ops = &r8712_usb_set_intf_ops;
50	init_intf_priv = &r8712_usb_init_intf_priv;
51	pintf_priv = pintf_hdl->pintfpriv = kmalloc(sizeof(struct intf_priv),
52						    GFP_ATOMIC);
53	if (!pintf_priv)
54		goto _init_intf_hdl_fail;
55	pintf_hdl->adapter = (u8 *)padapter;
56	set_intf_option(&pintf_hdl->intf_option);
57	set_intf_funs(pintf_hdl);
58	set_intf_ops(&pintf_hdl->io_ops);
59	pintf_priv->intf_dev = (u8 *)&padapter->dvobjpriv;
60	if (init_intf_priv(pintf_priv) == _FAIL)
61		goto _init_intf_hdl_fail;
62	return _SUCCESS;
63_init_intf_hdl_fail:
64	kfree(pintf_priv);
65	return _FAIL;
66}
67
68static void _unload_intf_hdl(struct intf_priv *pintfpriv)
69{
70	void (*unload_intf_priv)(struct intf_priv *pintfpriv);
71
72	unload_intf_priv = &r8712_usb_unload_intf_priv;
73	unload_intf_priv(pintfpriv);
74	kfree(pintfpriv);
75}
76
77static uint register_intf_hdl(u8 *dev, struct intf_hdl *pintfhdl)
78{
79	struct _adapter *adapter = (struct _adapter *)dev;
80
81	pintfhdl->intf_option = 0;
82	pintfhdl->adapter = dev;
83	pintfhdl->intf_dev = (u8 *)&adapter->dvobjpriv;
84	if (!_init_intf_hdl(adapter, pintfhdl))
85		goto register_intf_hdl_fail;
86	return _SUCCESS;
87register_intf_hdl_fail:
88	return false;
89}
90
91static  void unregister_intf_hdl(struct intf_hdl *pintfhdl)
92{
93	_unload_intf_hdl(pintfhdl->pintfpriv);
94	memset((u8 *)pintfhdl, 0, sizeof(struct intf_hdl));
95}
96
97uint r8712_alloc_io_queue(struct _adapter *adapter)
98{
99	u32 i;
100	struct io_queue *pio_queue;
101	struct io_req *pio_req;
102
103	pio_queue = kmalloc(sizeof(*pio_queue), GFP_ATOMIC);
104	if (!pio_queue)
105		goto alloc_io_queue_fail;
106	INIT_LIST_HEAD(&pio_queue->free_ioreqs);
107	INIT_LIST_HEAD(&pio_queue->processing);
108	INIT_LIST_HEAD(&pio_queue->pending);
109	spin_lock_init(&pio_queue->lock);
110	pio_queue->pallocated_free_ioreqs_buf = kzalloc(NUM_IOREQ *
111						(sizeof(struct io_req)) + 4,
112						GFP_ATOMIC);
113	if ((pio_queue->pallocated_free_ioreqs_buf) == NULL)
114		goto alloc_io_queue_fail;
115	pio_queue->free_ioreqs_buf = pio_queue->pallocated_free_ioreqs_buf + 4
116			- ((addr_t)(pio_queue->pallocated_free_ioreqs_buf)
117			& 3);
118	pio_req = (struct io_req *)(pio_queue->free_ioreqs_buf);
119	for (i = 0; i < NUM_IOREQ; i++) {
120		INIT_LIST_HEAD(&pio_req->list);
121		list_add_tail(&pio_req->list, &pio_queue->free_ioreqs);
122		pio_req++;
123	}
124	if ((register_intf_hdl((u8 *)adapter, &pio_queue->intf)) == _FAIL)
125		goto alloc_io_queue_fail;
126	adapter->pio_queue = pio_queue;
127	return _SUCCESS;
128alloc_io_queue_fail:
129	if (pio_queue) {
130		kfree(pio_queue->pallocated_free_ioreqs_buf);
131		kfree(pio_queue);
132	}
133	adapter->pio_queue = NULL;
134	return _FAIL;
135}
136
137void r8712_free_io_queue(struct _adapter *adapter)
138{
139	struct io_queue *pio_queue = adapter->pio_queue;
140
141	if (pio_queue) {
142		kfree(pio_queue->pallocated_free_ioreqs_buf);
143		adapter->pio_queue = NULL;
144		unregister_intf_hdl(&pio_queue->intf);
145		kfree(pio_queue);
146	}
147}
148