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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef B43legacy_PIO_H_
#define B43legacy_PIO_H_
#include "b43legacy.h"
#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/skbuff.h>
#define B43legacy_PIO_TXCTL 0x00
#define B43legacy_PIO_TXDATA 0x02
#define B43legacy_PIO_TXQBUFSIZE 0x04
#define B43legacy_PIO_RXCTL 0x08
#define B43legacy_PIO_RXDATA 0x0A
#define B43legacy_PIO_TXCTL_WRITELO (1 << 0)
#define B43legacy_PIO_TXCTL_WRITEHI (1 << 1)
#define B43legacy_PIO_TXCTL_COMPLETE (1 << 2)
#define B43legacy_PIO_TXCTL_INIT (1 << 3)
#define B43legacy_PIO_TXCTL_SUSPEND (1 << 7)
#define B43legacy_PIO_RXCTL_DATAAVAILABLE (1 << 0)
#define B43legacy_PIO_RXCTL_READY (1 << 1)
/* PIO constants */
#define B43legacy_PIO_MAXTXDEVQPACKETS 31
#define B43legacy_PIO_TXQADJUST 80
/* PIO tuning knobs */
#define B43legacy_PIO_MAXTXPACKETS 256
#ifdef CONFIG_B43LEGACY_PIO
struct b43legacy_pioqueue;
struct b43legacy_xmitstatus;
struct b43legacy_pio_txpacket {
struct b43legacy_pioqueue *queue;
struct sk_buff *skb;
struct list_head list;
};
#define pio_txpacket_getindex(packet) ((int)((packet) - \
(packet)->queue->tx_packets_cache))
struct b43legacy_pioqueue {
struct b43legacy_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;
struct tasklet_struct txtask;
struct b43legacy_pio_txpacket
tx_packets_cache[B43legacy_PIO_MAXTXPACKETS];
};
static inline
u16 b43legacy_pio_read(struct b43legacy_pioqueue *queue,
u16 offset)
{
return b43legacy_read16(queue->dev, queue->mmio_base + offset);
}
static inline
void b43legacy_pio_write(struct b43legacy_pioqueue *queue,
u16 offset, u16 value)
{
b43legacy_write16(queue->dev, queue->mmio_base + offset, value);
mmiowb();
}
int b43legacy_pio_init(struct b43legacy_wldev *dev);
void b43legacy_pio_free(struct b43legacy_wldev *dev);
int b43legacy_pio_tx(struct b43legacy_wldev *dev,
struct sk_buff *skb);
void b43legacy_pio_handle_txstatus(struct b43legacy_wldev *dev,
const struct b43legacy_txstatus *status);
void b43legacy_pio_rx(struct b43legacy_pioqueue *queue);
/* Suspend TX queue in hardware. */
void b43legacy_pio_tx_suspend(struct b43legacy_pioqueue *queue);
void b43legacy_pio_tx_resume(struct b43legacy_pioqueue *queue);
/* Suspend (freeze) the TX tasklet (software level). */
void b43legacy_pio_freeze_txqueues(struct b43legacy_wldev *dev);
void b43legacy_pio_thaw_txqueues(struct b43legacy_wldev *dev);
#else /* CONFIG_B43LEGACY_PIO */
static inline
int b43legacy_pio_init(struct b43legacy_wldev *dev)
{
return 0;
}
static inline
void b43legacy_pio_free(struct b43legacy_wldev *dev)
{
}
static inline
int b43legacy_pio_tx(struct b43legacy_wldev *dev,
struct sk_buff *skb)
{
return 0;
}
static inline
void b43legacy_pio_handle_txstatus(struct b43legacy_wldev *dev,
const struct b43legacy_txstatus *status)
{
}
static inline
void b43legacy_pio_rx(struct b43legacy_pioqueue *queue)
{
}
static inline
void b43legacy_pio_tx_suspend(struct b43legacy_pioqueue *queue)
{
}
static inline
void b43legacy_pio_tx_resume(struct b43legacy_pioqueue *queue)
{
}
static inline
void b43legacy_pio_freeze_txqueues(struct b43legacy_wldev *dev)
{
}
static inline
void b43legacy_pio_thaw_txqueues(struct b43legacy_wldev *dev)
{
}
#endif /* CONFIG_B43LEGACY_PIO */
#endif /* B43legacy_PIO_H_ */
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