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
 38struct b43legacy_pioqueue;
 39struct b43legacy_xmitstatus;
 40
 41struct 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
 50struct 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
 82static inline
 83u16 b43legacy_pio_read(struct b43legacy_pioqueue *queue,
 84		     u16 offset)
 85{
 86	return b43legacy_read16(queue->dev, queue->mmio_base + offset);
 87}
 88
 89static inline
 90void 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
 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_ */