drivers/net/wireless/bcm43xx/bcm43xx_pio.h

   1 #ifndef BCM43xx_PIO_H_
   2 #define BCM43xx_PIO_H_
   3
   4 #include "bcm43xx.h"
   5
   6 #include <linux/interrupt.h>
   7 #include <linux/list.h>
   8 #include <linux/skbuff.h>
   9
  10
  11 #define BCM43xx_PIO_TXCTL               0x00
  12 #define BCM43xx_PIO_TXDATA              0x02
  13 #define BCM43xx_PIO_TXQBUFSIZE          0x04
  14 #define BCM43xx_PIO_RXCTL               0x08
  15 #define BCM43xx_PIO_RXDATA              0x0A
  16
  17 #define BCM43xx_PIO_TXCTL_WRITELO       (1 << 0)
  18 #define BCM43xx_PIO_TXCTL_WRITEHI       (1 << 1)
  19 #define BCM43xx_PIO_TXCTL_COMPLETE      (1 << 2)
  20 #define BCM43xx_PIO_TXCTL_INIT          (1 << 3)
  21 #define BCM43xx_PIO_TXCTL_SUSPEND       (1 << 7)
  22
  23 #define BCM43xx_PIO_RXCTL_DATAAVAILABLE (1 << 0)
  24 #define BCM43xx_PIO_RXCTL_READY         (1 << 1)
  25
  26 /* PIO constants */
  27 #define BCM43xx_PIO_MAXTXDEVQPACKETS    31
  28 #define BCM43xx_PIO_TXQADJUST           80
  29
  30 /* PIO tuning knobs */
  31 #define BCM43xx_PIO_MAXTXPACKETS        256
  32
  33
  34
  35 #ifdef CONFIG_BCM43XX_PIO
  36
  37
  38 struct bcm43xx_pioqueue;
  39 struct bcm43xx_xmitstatus;
  40
  41 struct bcm43xx_pio_txpacket {
  42         struct bcm43xx_pioqueue *queue;
  43         struct ieee80211_txb *txb;
  44         struct list_head list;
  45
  46         u8 xmitted_frags;
  47         u16 xmitted_octets;
  48 };
  49
  50 #define pio_txpacket_getindex(packet) ((int)((packet) - (packet)->queue->tx_packets_cache))
  51
  52 struct bcm43xx_pioqueue {
  53         struct bcm43xx_private *bcm;
  54         u16 mmio_base;
  55
  56         u8 tx_suspended:1,
  57            tx_frozen:1,
  58            need_workarounds:1; /* Workarounds needed for core.rev < 3 */
  59
  60         /* Adjusted size of the device internal TX buffer. */
  61         u16 tx_devq_size;
  62         /* Used octets of the device internal TX buffer. */
  63         u16 tx_devq_used;
  64         /* Used packet slots in the device internal TX buffer. */
  65         u8 tx_devq_packets;
  66         /* Packets from the txfree list can
  67          * be taken on incoming TX requests.
  68          */
  69         struct list_head txfree;
  70         unsigned int nr_txfree;
  71         /* Packets on the txqueue are queued,
  72          * but not completely written to the chip, yet.
  73          */
  74         struct list_head txqueue;
  75         /* Packets on the txrunning queue are completely
  76          * posted to the device. We are waiting for the txstatus.
  77          */
  78         struct list_head txrunning;
  79         /* Total number or packets sent.
  80          * (This counter can obviously wrap).
  81          */
  82         unsigned int nr_tx_packets;
  83         struct tasklet_struct txtask;
  84         struct bcm43xx_pio_txpacket tx_packets_cache[BCM43xx_PIO_MAXTXPACKETS];
  85 };
  86
  87 static inline
  88 u16 bcm43xx_pio_read(struct bcm43xx_pioqueue *queue,
  89                      u16 offset)
  90 {
  91         return bcm43xx_read16(queue->bcm, queue->mmio_base + offset);
  92 }
  93
  94 static inline
  95 void bcm43xx_pio_write(struct bcm43xx_pioqueue *queue,
  96                        u16 offset, u16 value)
  97 {
  98         bcm43xx_write16(queue->bcm, queue->mmio_base + offset, value);
  99         mmiowb();
 100 }
 101
 102
 103 int bcm43xx_pio_init(struct bcm43xx_private *bcm);
 104 void bcm43xx_pio_free(struct bcm43xx_private *bcm);
 105
 106 int bcm43xx_pio_tx(struct bcm43xx_private *bcm,
 107                    struct ieee80211_txb *txb);
 108 void bcm43xx_pio_handle_xmitstatus(struct bcm43xx_private *bcm,
 109                                    struct bcm43xx_xmitstatus *status);
 110 void bcm43xx_pio_rx(struct bcm43xx_pioqueue *queue);
 111
 112 /* Suspend a TX queue on hardware level. */
 113 void bcm43xx_pio_tx_suspend(struct bcm43xx_pioqueue *queue);
 114 void bcm43xx_pio_tx_resume(struct bcm43xx_pioqueue *queue);
 115 /* Suspend (freeze) the TX tasklet (software level). */
 116 void bcm43xx_pio_freeze_txqueues(struct bcm43xx_private *bcm);
 117 void bcm43xx_pio_thaw_txqueues(struct bcm43xx_private *bcm);
 118
 119 #else /* CONFIG_BCM43XX_PIO */
 120
 121 static inline
 122 int bcm43xx_pio_init(struct bcm43xx_private *bcm)
 123 {
 124         return 0;
 125 }
 126 static inline
 127 void bcm43xx_pio_free(struct bcm43xx_private *bcm)
 128 {
 129 }
 130 static inline
 131 int bcm43xx_pio_tx(struct bcm43xx_private *bcm,
 132                    struct ieee80211_txb *txb)
 133 {
 134         return 0;
 135 }
 136 static inline
 137 void bcm43xx_pio_handle_xmitstatus(struct bcm43xx_private *bcm,
 138                                    struct bcm43xx_xmitstatus *status)
 139 {
 140 }
 141 static inline
 142 void bcm43xx_pio_rx(struct bcm43xx_pioqueue *queue)
 143 {
 144 }
 145 static inline
 146 void bcm43xx_pio_tx_suspend(struct bcm43xx_pioqueue *queue)
 147 {
 148 }
 149 static inline
 150 void bcm43xx_pio_tx_resume(struct bcm43xx_pioqueue *queue)
 151 {
 152 }
 153 static inline
 154 void bcm43xx_pio_freeze_txqueues(struct bcm43xx_private *bcm)
 155 {
 156 }
 157 static inline
 158 void bcm43xx_pio_thaw_txqueues(struct bcm43xx_private *bcm)
 159 {
 160 }
 161
 162 #endif /* CONFIG_BCM43XX_PIO */
 163 #endif /* BCM43xx_PIO_H_ */