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
 39struct b43legacy_pioqueue;
 40struct b43legacy_xmitstatus;
 41
 42struct 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
 51struct 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
 83static inline
 84u16 b43legacy_pio_read(struct b43legacy_pioqueue *queue,
 85		     u16 offset)
 86{
 87	return b43legacy_read16(queue->dev, queue->mmio_base + offset);
 88}
 89
 90static inline
 91void 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
 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_ */