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 
39 struct b43legacy_pioqueue;
40 struct b43legacy_xmitstatus;
41 
42 struct 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 
51 struct 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 
83 static inline
b43legacy_pio_read(struct b43legacy_pioqueue * queue,u16 offset)84 u16 b43legacy_pio_read(struct b43legacy_pioqueue *queue,
85 		     u16 offset)
86 {
87 	return b43legacy_read16(queue->dev, queue->mmio_base + offset);
88 }
89 
90 static inline
b43legacy_pio_write(struct b43legacy_pioqueue * queue,u16 offset,u16 value)91 void 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 
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
b43legacy_pio_init(struct b43legacy_wldev * dev)117 int b43legacy_pio_init(struct b43legacy_wldev *dev)
118 {
119 	return 0;
120 }
121 static inline
b43legacy_pio_free(struct b43legacy_wldev * dev)122 void b43legacy_pio_free(struct b43legacy_wldev *dev)
123 {
124 }
125 static inline
b43legacy_pio_tx(struct b43legacy_wldev * dev,struct sk_buff * skb)126 int b43legacy_pio_tx(struct b43legacy_wldev *dev,
127 		   struct sk_buff *skb)
128 {
129 	return 0;
130 }
131 static inline
b43legacy_pio_handle_txstatus(struct b43legacy_wldev * dev,const struct b43legacy_txstatus * status)132 void b43legacy_pio_handle_txstatus(struct b43legacy_wldev *dev,
133 				 const struct b43legacy_txstatus *status)
134 {
135 }
136 static inline
b43legacy_pio_rx(struct b43legacy_pioqueue * queue)137 void b43legacy_pio_rx(struct b43legacy_pioqueue *queue)
138 {
139 }
140 static inline
b43legacy_pio_tx_suspend(struct b43legacy_pioqueue * queue)141 void b43legacy_pio_tx_suspend(struct b43legacy_pioqueue *queue)
142 {
143 }
144 static inline
b43legacy_pio_tx_resume(struct b43legacy_pioqueue * queue)145 void b43legacy_pio_tx_resume(struct b43legacy_pioqueue *queue)
146 {
147 }
148 static inline
b43legacy_pio_freeze_txqueues(struct b43legacy_wldev * dev)149 void b43legacy_pio_freeze_txqueues(struct b43legacy_wldev *dev)
150 {
151 }
152 static inline
b43legacy_pio_thaw_txqueues(struct b43legacy_wldev * dev)153 void b43legacy_pio_thaw_txqueues(struct b43legacy_wldev *dev)
154 {
155 }
156 
157 #endif /* CONFIG_B43LEGACY_PIO */
158 #endif /* B43legacy_PIO_H_ */
159