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_ */
159