drivers/net/wireless/b43legacy/pio.h

   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
  38 struct b43legacy_pioqueue;
  39 struct b43legacy_xmitstatus;
  40
  41 struct 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
  50 struct 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         /* Total number or packets sent.
  78          * (This counter can obviously wrap).
  79          */
  80         unsigned int nr_tx_packets;
  81         struct tasklet_struct txtask;
  82         struct b43legacy_pio_txpacket
  83                          tx_packets_cache[B43legacy_PIO_MAXTXPACKETS];
  84 };
  85
  86 static inline
  87 u16 b43legacy_pio_read(struct b43legacy_pioqueue *queue,
  88                      u16 offset)
  89 {
  90         return b43legacy_read16(queue->dev, queue->mmio_base + offset);
  91 }
  92
  93 static inline
  94 void b43legacy_pio_write(struct b43legacy_pioqueue *queue,
  95                        u16 offset, u16 value)
  96 {
  97         b43legacy_write16(queue->dev, queue->mmio_base + offset, value);
  98         mmiowb();
  99 }
 100
 101
 102 int b43legacy_pio_init(struct b43legacy_wldev *dev);
 103 void b43legacy_pio_free(struct b43legacy_wldev *dev);
 104
 105 int b43legacy_pio_tx(struct b43legacy_wldev *dev,
 106                    struct sk_buff *skb);
 107 void b43legacy_pio_handle_txstatus(struct b43legacy_wldev *dev,
 108                                  const struct b43legacy_txstatus *status);
 109 void b43legacy_pio_get_tx_stats(struct b43legacy_wldev *dev,
 110                               struct ieee80211_tx_queue_stats *stats);
 111 void b43legacy_pio_rx(struct b43legacy_pioqueue *queue);
 112
 113 /* Suspend TX queue in hardware. */
 114 void b43legacy_pio_tx_suspend(struct b43legacy_pioqueue *queue);
 115 void b43legacy_pio_tx_resume(struct b43legacy_pioqueue *queue);
 116 /* Suspend (freeze) the TX tasklet (software level). */
 117 void b43legacy_pio_freeze_txqueues(struct b43legacy_wldev *dev);
 118 void b43legacy_pio_thaw_txqueues(struct b43legacy_wldev *dev);
 119
 120 #else /* CONFIG_B43LEGACY_PIO */
 121
 122 static inline
 123 int b43legacy_pio_init(struct b43legacy_wldev *dev)
 124 {
 125         return 0;
 126 }
 127 static inline
 128 void b43legacy_pio_free(struct b43legacy_wldev *dev)
 129 {
 130 }
 131 static inline
 132 int b43legacy_pio_tx(struct b43legacy_wldev *dev,
 133                    struct sk_buff *skb)
 134 {
 135         return 0;
 136 }
 137 static inline
 138 void b43legacy_pio_handle_txstatus(struct b43legacy_wldev *dev,
 139                                  const struct b43legacy_txstatus *status)
 140 {
 141 }
 142 static inline
 143 void b43legacy_pio_get_tx_stats(struct b43legacy_wldev *dev,
 144                               struct ieee80211_tx_queue_stats *stats)
 145 {
 146 }
 147 static inline
 148 void b43legacy_pio_rx(struct b43legacy_pioqueue *queue)
 149 {
 150 }
 151 static inline
 152 void b43legacy_pio_tx_suspend(struct b43legacy_pioqueue *queue)
 153 {
 154 }
 155 static inline
 156 void b43legacy_pio_tx_resume(struct b43legacy_pioqueue *queue)
 157 {
 158 }
 159 static inline
 160 void b43legacy_pio_freeze_txqueues(struct b43legacy_wldev *dev)
 161 {
 162 }
 163 static inline
 164 void b43legacy_pio_thaw_txqueues(struct b43legacy_wldev *dev)
 165 {
 166 }
 167
 168 #endif /* CONFIG_B43LEGACY_PIO */
 169 #endif /* B43legacy_PIO_H_ */