pio.h

linux内核源码

#ifndef B43_PIO_H_
#define B43_PIO_H_

#include "b43.h"

#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/list.h>
#include <linux/skbuff.h>

#define B43_PIO_TXCTL		0x00
#define B43_PIO_TXDATA		0x02
#define B43_PIO_TXQBUFSIZE		0x04
#define B43_PIO_RXCTL		0x08
#define B43_PIO_RXDATA		0x0A

#define B43_PIO_TXCTL_WRITELO	(1 << 0)
#define B43_PIO_TXCTL_WRITEHI	(1 << 1)
#define B43_PIO_TXCTL_COMPLETE	(1 << 2)
#define B43_PIO_TXCTL_INIT		(1 << 3)
#define B43_PIO_TXCTL_SUSPEND	(1 << 7)

#define B43_PIO_RXCTL_DATAAVAILABLE	(1 << 0)
#define B43_PIO_RXCTL_READY		(1 << 1)

/* PIO constants */
#define B43_PIO_MAXTXDEVQPACKETS	31
#define B43_PIO_TXQADJUST		80

/* PIO tuning knobs */
#define B43_PIO_MAXTXPACKETS	256

#ifdef CONFIG_B43_PIO

struct b43_pioqueue;
struct b43_xmitstatus;

struct b43_pio_txpacket {
	struct b43_pioqueue *queue;
	struct sk_buff *skb;
	struct ieee80211_tx_status txstat;
	struct list_head list;
	u16 index; /* Index in the tx_packets_cache */
};

struct b43_pioqueue {
	struct b43_wldev *dev;
	u16 mmio_base;

	bool tx_suspended;
	bool tx_frozen;
	bool need_workarounds;	/* Workarounds needed for core.rev < 3 */

	/* Adjusted size of the device internal TX buffer. */
	u16 tx_devq_size;
	/* Used octets of the device internal TX buffer. */
	u16 tx_devq_used;
	/* Used packet slots in the device internal TX buffer. */
	u8 tx_devq_packets;
	/* Packets from the txfree list can
	 * be taken on incoming TX requests.
	 */
	struct list_head txfree;
	unsigned int nr_txfree;
	/* Packets on the txqueue are queued,
	 * but not completely written to the chip, yet.
	 */
	struct list_head txqueue;
	/* Packets on the txrunning queue are completely
	 * posted to the device. We are waiting for the txstatus.
	 */
	struct list_head txrunning;
	/* Total number or packets sent.
	 * (This counter can obviously wrap).
	 */
	unsigned int nr_tx_packets;
	struct tasklet_struct txtask;
	struct b43_pio_txpacket tx_packets_cache[B43_PIO_MAXTXPACKETS];
};

static inline u16 b43_pio_read(struct b43_pioqueue *queue, u16 offset)
{
	return b43_read16(queue->dev, queue->mmio_base + offset);
}

static inline
    void b43_pio_write(struct b43_pioqueue *queue, u16 offset, u16 value)
{
	b43_write16(queue->dev, queue->mmio_base + offset, value);
	mmiowb();
}

int b43_pio_init(struct b43_wldev *dev);
void b43_pio_free(struct b43_wldev *dev);

int b43_pio_tx(struct b43_wldev *dev,
	       struct sk_buff *skb, struct ieee80211_tx_control *ctl);
void b43_pio_handle_txstatus(struct b43_wldev *dev,
			     const struct b43_txstatus *status);
void b43_pio_get_tx_stats(struct b43_wldev *dev,
			  struct ieee80211_tx_queue_stats *stats);
void b43_pio_rx(struct b43_pioqueue *queue);

/* Suspend TX queue in hardware. */
void b43_pio_tx_suspend(struct b43_pioqueue *queue);
void b43_pio_tx_resume(struct b43_pioqueue *queue);
/* Suspend (freeze) the TX tasklet (software level). */
void b43_pio_freeze_txqueues(struct b43_wldev *dev);
void b43_pio_thaw_txqueues(struct b43_wldev *dev);

#else /* CONFIG_B43_PIO */

static inline int b43_pio_init(struct b43_wldev *dev)
{
	return 0;
}
static inline void b43_pio_free(struct b43_wldev *dev)
{
}
static inline
    int b43_pio_tx(struct b43_wldev *dev,
		   struct sk_buff *skb, struct ieee80211_tx_control *ctl)
{
	return 0;
}
static inline
    void b43_pio_handle_txstatus(struct b43_wldev *dev,
				 const struct b43_txstatus *status)
{
}
static inline
    void b43_pio_get_tx_stats(struct b43_wldev *dev,
			      struct ieee80211_tx_queue_stats *stats)
{
}
static inline void b43_pio_rx(struct b43_pioqueue *queue)
{
}
static inline void b43_pio_tx_suspend(struct b43_pioqueue *queue)
{
}
static inline void b43_pio_tx_resume(struct b43_pioqueue *queue)
{
}
static inline void b43_pio_freeze_txqueues(struct b43_wldev *dev)
{
}
static inline void b43_pio_thaw_txqueues(struct b43_wldev *dev)
{
}

#endif /* CONFIG_B43_PIO */
#endif /* B43_PIO_H_ */