Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
pio.h
Go to the documentation of this file.
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  struct tasklet_struct txtask;
78  struct b43legacy_pio_txpacket
79  tx_packets_cache[B43legacy_PIO_MAXTXPACKETS];
80 };
81 
82 static inline
83 u16 b43legacy_pio_read(struct b43legacy_pioqueue *queue,
84  u16 offset)
85 {
86  return b43legacy_read16(queue->dev, queue->mmio_base + offset);
87 }
88 
89 static inline
90 void b43legacy_pio_write(struct b43legacy_pioqueue *queue,
91  u16 offset, u16 value)
92 {
93  b43legacy_write16(queue->dev, queue->mmio_base + offset, value);
94  mmiowb();
95 }
96 
97 
98 int b43legacy_pio_init(struct b43legacy_wldev *dev);
99 void b43legacy_pio_free(struct b43legacy_wldev *dev);
100 
101 int b43legacy_pio_tx(struct b43legacy_wldev *dev,
102  struct sk_buff *skb);
103 void b43legacy_pio_handle_txstatus(struct b43legacy_wldev *dev,
104  const struct b43legacy_txstatus *status);
105 void b43legacy_pio_rx(struct b43legacy_pioqueue *queue);
106 
107 /* Suspend TX queue in hardware. */
108 void b43legacy_pio_tx_suspend(struct b43legacy_pioqueue *queue);
109 void b43legacy_pio_tx_resume(struct b43legacy_pioqueue *queue);
110 /* Suspend (freeze) the TX tasklet (software level). */
111 void b43legacy_pio_freeze_txqueues(struct b43legacy_wldev *dev);
112 void b43legacy_pio_thaw_txqueues(struct b43legacy_wldev *dev);
113 
114 #else /* CONFIG_B43LEGACY_PIO */
115 
116 static inline
117 int b43legacy_pio_init(struct b43legacy_wldev *dev)
118 {
119  return 0;
120 }
121 static inline
122 void b43legacy_pio_free(struct b43legacy_wldev *dev)
123 {
124 }
125 static inline
126 int b43legacy_pio_tx(struct b43legacy_wldev *dev,
127  struct sk_buff *skb)
128 {
129  return 0;
130 }
131 static inline
132 void b43legacy_pio_handle_txstatus(struct b43legacy_wldev *dev,
133  const struct b43legacy_txstatus *status)
134 {
135 }
136 static inline
137 void b43legacy_pio_rx(struct b43legacy_pioqueue *queue)
138 {
139 }
140 static inline
141 void b43legacy_pio_tx_suspend(struct b43legacy_pioqueue *queue)
142 {
143 }
144 static inline
145 void b43legacy_pio_tx_resume(struct b43legacy_pioqueue *queue)
146 {
147 }
148 static inline
149 void b43legacy_pio_freeze_txqueues(struct b43legacy_wldev *dev)
150 {
151 }
152 static inline
153 void b43legacy_pio_thaw_txqueues(struct b43legacy_wldev *dev)
154 {
155 }
156 
157 #endif /* CONFIG_B43LEGACY_PIO */
158 #endif /* B43legacy_PIO_H_ */
Generated on Thu Jan 10 2013 13:03:54 for Linux Kernel by   doxygen 1.8.2