1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef B43legacy_PIO_H_
3#define B43legacy_PIO_H_
4
5#include "b43legacy.h"
6
7#include <linux/interrupt.h>
8#include <linux/list.h>
9#include <linux/skbuff.h>
10
11
12#define B43legacy_PIO_TXCTL		0x00
13#define B43legacy_PIO_TXDATA		0x02
14#define B43legacy_PIO_TXQBUFSIZE	0x04
15#define B43legacy_PIO_RXCTL		0x08
16#define B43legacy_PIO_RXDATA		0x0A
17
18#define B43legacy_PIO_TXCTL_WRITELO	(1 << 0)
19#define B43legacy_PIO_TXCTL_WRITEHI	(1 << 1)
20#define B43legacy_PIO_TXCTL_COMPLETE	(1 << 2)
21#define B43legacy_PIO_TXCTL_INIT	(1 << 3)
22#define B43legacy_PIO_TXCTL_SUSPEND	(1 << 7)
23
24#define B43legacy_PIO_RXCTL_DATAAVAILABLE	(1 << 0)
25#define B43legacy_PIO_RXCTL_READY		(1 << 1)
26
27/* PIO constants */
28#define B43legacy_PIO_MAXTXDEVQPACKETS	31
29#define B43legacy_PIO_TXQADJUST		80
30
31/* PIO tuning knobs */
32#define B43legacy_PIO_MAXTXPACKETS	256
33
34
35
36#ifdef CONFIG_B43LEGACY_PIO
37
38
39struct b43legacy_pioqueue;
40struct b43legacy_xmitstatus;
41
42struct b43legacy_pio_txpacket {
43	struct b43legacy_pioqueue *queue;
44	struct sk_buff *skb;
45	struct list_head list;
46};
47
48#define pio_txpacket_getindex(packet) ((int)((packet) - \
49			      (packet)->queue->tx_packets_cache))
50
51struct b43legacy_pioqueue {
52	struct b43legacy_wldev *dev;
53	u16 mmio_base;
54
55	bool tx_suspended;
56	bool tx_frozen;
57	bool need_workarounds; /* Workarounds needed for core.rev < 3 */
58
59	/* Adjusted size of the device internal TX buffer. */
60	u16 tx_devq_size;
61	/* Used octets of the device internal TX buffer. */
62	u16 tx_devq_used;
63	/* Used packet slots in the device internal TX buffer. */
64	u8 tx_devq_packets;
65	/* Packets from the txfree list can
66	 * be taken on incoming TX requests.
67	 */
68	struct list_head txfree;
69	unsigned int nr_txfree;
70	/* Packets on the txqueue are queued,
71	 * but not completely written to the chip, yet.
72	 */
73	struct list_head txqueue;
74	/* Packets on the txrunning queue are completely
75	 * posted to the device. We are waiting for the txstatus.
76	 */
77	struct list_head txrunning;
78	struct tasklet_struct txtask;
79	struct b43legacy_pio_txpacket
80			 tx_packets_cache[B43legacy_PIO_MAXTXPACKETS];
81};
82
83static inline
84u16 b43legacy_pio_read(struct b43legacy_pioqueue *queue,
85		     u16 offset)
86{
87	return b43legacy_read16(queue->dev, queue->mmio_base + offset);
88}
89
90static inline
91void b43legacy_pio_write(struct b43legacy_pioqueue *queue,
92		       u16 offset, u16 value)
93{
94	b43legacy_write16(queue->dev, queue->mmio_base + offset, value);
95}
96
97
98int b43legacy_pio_init(struct b43legacy_wldev *dev);
99void b43legacy_pio_free(struct b43legacy_wldev *dev);
100
101int b43legacy_pio_tx(struct b43legacy_wldev *dev,
102		   struct sk_buff *skb);
103void b43legacy_pio_handle_txstatus(struct b43legacy_wldev *dev,
104				 const struct b43legacy_txstatus *status);
105void b43legacy_pio_rx(struct b43legacy_pioqueue *queue);
106
107/* Suspend TX queue in hardware. */
108void b43legacy_pio_tx_suspend(struct b43legacy_pioqueue *queue);
109void b43legacy_pio_tx_resume(struct b43legacy_pioqueue *queue);
110/* Suspend (freeze) the TX tasklet (software level). */
111void b43legacy_pio_freeze_txqueues(struct b43legacy_wldev *dev);
112void b43legacy_pio_thaw_txqueues(struct b43legacy_wldev *dev);
113
114#else /* CONFIG_B43LEGACY_PIO */
115
116static inline
117int b43legacy_pio_init(struct b43legacy_wldev *dev)
118{
119	return 0;
120}
121static inline
122void b43legacy_pio_free(struct b43legacy_wldev *dev)
123{
124}
125static inline
126int b43legacy_pio_tx(struct b43legacy_wldev *dev,
127		   struct sk_buff *skb)
128{
129	return 0;
130}
131static inline
132void b43legacy_pio_handle_txstatus(struct b43legacy_wldev *dev,
133				 const struct b43legacy_txstatus *status)
134{
135}
136static inline
137void b43legacy_pio_rx(struct b43legacy_pioqueue *queue)
138{
139}
140static inline
141void b43legacy_pio_tx_suspend(struct b43legacy_pioqueue *queue)
142{
143}
144static inline
145void b43legacy_pio_tx_resume(struct b43legacy_pioqueue *queue)
146{
147}
148static inline
149void b43legacy_pio_freeze_txqueues(struct b43legacy_wldev *dev)
150{
151}
152static inline
153void b43legacy_pio_thaw_txqueues(struct b43legacy_wldev *dev)
154{
155}
156
157#endif /* CONFIG_B43LEGACY_PIO */
158#endif /* B43legacy_PIO_H_ */
159