1 #ifndef B43legacy_PIO_H_
2 #define B43legacy_PIO_H_
3
4 #include "b43legacy.h"
5
6 #include <linux/interrupt.h>
7 #include <linux/list.h>
8 #include <linux/skbuff.h>
9
10
11 #define B43legacy_PIO_TXCTL 0x00
12 #define B43legacy_PIO_TXDATA 0x02
13 #define B43legacy_PIO_TXQBUFSIZE 0x04
14 #define B43legacy_PIO_RXCTL 0x08
15 #define B43legacy_PIO_RXDATA 0x0A
16
17 #define B43legacy_PIO_TXCTL_WRITELO (1 << 0)
18 #define B43legacy_PIO_TXCTL_WRITEHI (1 << 1)
19 #define B43legacy_PIO_TXCTL_COMPLETE (1 << 2)
20 #define B43legacy_PIO_TXCTL_INIT (1 << 3)
21 #define B43legacy_PIO_TXCTL_SUSPEND (1 << 7)
22
23 #define B43legacy_PIO_RXCTL_DATAAVAILABLE (1 << 0)
24 #define B43legacy_PIO_RXCTL_READY (1 << 1)
25
26 /* PIO constants */
27 #define B43legacy_PIO_MAXTXDEVQPACKETS 31
28 #define B43legacy_PIO_TXQADJUST 80
29
30 /* PIO tuning knobs */
31 #define B43legacy_PIO_MAXTXPACKETS 256
32
33
34
35 #ifdef CONFIG_B43LEGACY_PIO
36
37
38 struct b43legacy_pioqueue;
39 struct b43legacy_xmitstatus;
40
41 struct b43legacy_pio_txpacket {
42 struct b43legacy_pioqueue *queue;
43 struct sk_buff *skb;
44 struct list_head list;
45 };
46
47 #define pio_txpacket_getindex(packet) ((int)((packet) - \
48 (packet)->queue->tx_packets_cache))
49
50 struct b43legacy_pioqueue {
51 struct b43legacy_wldev *dev;
52 u16 mmio_base;
53
54 bool tx_suspended;
55 bool tx_frozen;
56 bool need_workarounds; /* Workarounds needed for core.rev < 3 */
57
58 /* Adjusted size of the device internal TX buffer. */
59 u16 tx_devq_size;
60 /* Used octets of the device internal TX buffer. */
61 u16 tx_devq_used;
62 /* Used packet slots in the device internal TX buffer. */
63 u8 tx_devq_packets;
64 /* Packets from the txfree list can
65 * be taken on incoming TX requests.
66 */
67 struct list_head txfree;
68 unsigned int nr_txfree;
69 /* Packets on the txqueue are queued,
70 * but not completely written to the chip, yet.
71 */
72 struct list_head txqueue;
73 /* Packets on the txrunning queue are completely
74 * posted to the device. We are waiting for the txstatus.
75 */
76 struct list_head txrunning;
77 /* Total number or packets sent.
78 * (This counter can obviously wrap).
79 */
80 unsigned int nr_tx_packets;
81 struct tasklet_struct txtask;
82 struct b43legacy_pio_txpacket
83 tx_packets_cache[B43legacy_PIO_MAXTXPACKETS];
84 };
85
86 static inline
87 u16 b43legacy_pio_read(struct b43legacy_pioqueue *queue,
88 u16 offset)
89 {
90 return b43legacy_read16(queue->dev, queue->mmio_base + offset);
91 }
92
93 static inline
94 void b43legacy_pio_write(struct b43legacy_pioqueue *queue,
95 u16 offset, u16 value)
96 {
97 b43legacy_write16(queue->dev, queue->mmio_base + offset, value);
98 mmiowb();
99 }
100
101
102 int b43legacy_pio_init(struct b43legacy_wldev *dev);
103 void b43legacy_pio_free(struct b43legacy_wldev *dev);
104
105 int b43legacy_pio_tx(struct b43legacy_wldev *dev,
106 struct sk_buff *skb);
107 void b43legacy_pio_handle_txstatus(struct b43legacy_wldev *dev,
108 const struct b43legacy_txstatus *status);
109 void b43legacy_pio_get_tx_stats(struct b43legacy_wldev *dev,
110 struct ieee80211_tx_queue_stats *stats);
111 void b43legacy_pio_rx(struct b43legacy_pioqueue *queue);
112
113 /* Suspend TX queue in hardware. */
114 void b43legacy_pio_tx_suspend(struct b43legacy_pioqueue *queue);
115 void b43legacy_pio_tx_resume(struct b43legacy_pioqueue *queue);
116 /* Suspend (freeze) the TX tasklet (software level). */
117 void b43legacy_pio_freeze_txqueues(struct b43legacy_wldev *dev);
118 void b43legacy_pio_thaw_txqueues(struct b43legacy_wldev *dev);
119
120 #else /* CONFIG_B43LEGACY_PIO */
121
122 static inline
123 int b43legacy_pio_init(struct b43legacy_wldev *dev)
124 {
125 return 0;
126 }
127 static inline
128 void b43legacy_pio_free(struct b43legacy_wldev *dev)
129 {
130 }
131 static inline
132 int b43legacy_pio_tx(struct b43legacy_wldev *dev,
133 struct sk_buff *skb)
134 {
135 return 0;
136 }
137 static inline
138 void b43legacy_pio_handle_txstatus(struct b43legacy_wldev *dev,
139 const struct b43legacy_txstatus *status)
140 {
141 }
142 static inline
143 void b43legacy_pio_get_tx_stats(struct b43legacy_wldev *dev,
144 struct ieee80211_tx_queue_stats *stats)
145 {
146 }
147 static inline
148 void b43legacy_pio_rx(struct b43legacy_pioqueue *queue)
149 {
150 }
151 static inline
152 void b43legacy_pio_tx_suspend(struct b43legacy_pioqueue *queue)
153 {
154 }
155 static inline
156 void b43legacy_pio_tx_resume(struct b43legacy_pioqueue *queue)
157 {
158 }
159 static inline
160 void b43legacy_pio_freeze_txqueues(struct b43legacy_wldev *dev)
161 {
162 }
163 static inline
164 void b43legacy_pio_thaw_txqueues(struct b43legacy_wldev *dev)
165 {
166 }
167
168 #endif /* CONFIG_B43LEGACY_PIO */
169 #endif /* B43legacy_PIO_H_ */
170
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