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 39 struct b43legacy_pioqueue; 40 struct b43legacy_xmitstatus; 41 42 struct 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 51 struct 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 83 static inline 84 u16 b43legacy_pio_read(struct b43legacy_pioqueue *queue, 85 u16 offset) 86 { 87 return b43legacy_read16(queue->dev, queue->mmio_base + offset); 88 } 89 90 static inline 91 void 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 98 int b43legacy_pio_init(struct b43legacy_wldev *dev); 99 void b43legacy_pio_free(struct b43legacy_wldev *dev); 100 101 int b43legacy_pio_tx(struct b43legacy_wldev *dev, 102 struct sk_buff *skb); 103 void b43legacy_pio_handle_txstatus(struct b43legacy_wldev *dev, 104 const struct b43legacy_txstatus *status); 105 void b43legacy_pio_rx(struct b43legacy_pioqueue *queue); 106 107 /* Suspend TX queue in hardware. */ 108 void b43legacy_pio_tx_suspend(struct b43legacy_pioqueue *queue); 109 void b43legacy_pio_tx_resume(struct b43legacy_pioqueue *queue); 110 /* Suspend (freeze) the TX tasklet (software level). */ 111 void b43legacy_pio_freeze_txqueues(struct b43legacy_wldev *dev); 112 void b43legacy_pio_thaw_txqueues(struct b43legacy_wldev *dev); 113 114 #else /* CONFIG_B43LEGACY_PIO */ 115 116 static inline 117 int b43legacy_pio_init(struct b43legacy_wldev *dev) 118 { 119 return 0; 120 } 121 static inline 122 void b43legacy_pio_free(struct b43legacy_wldev *dev) 123 { 124 } 125 static inline 126 int b43legacy_pio_tx(struct b43legacy_wldev *dev, 127 struct sk_buff *skb) 128 { 129 return 0; 130 } 131 static inline 132 void b43legacy_pio_handle_txstatus(struct b43legacy_wldev *dev, 133 const struct b43legacy_txstatus *status) 134 { 135 } 136 static inline 137 void b43legacy_pio_rx(struct b43legacy_pioqueue *queue) 138 { 139 } 140 static inline 141 void b43legacy_pio_tx_suspend(struct b43legacy_pioqueue *queue) 142 { 143 } 144 static inline 145 void b43legacy_pio_tx_resume(struct b43legacy_pioqueue *queue) 146 { 147 } 148 static inline 149 void b43legacy_pio_freeze_txqueues(struct b43legacy_wldev *dev) 150 { 151 } 152 static inline 153 void b43legacy_pio_thaw_txqueues(struct b43legacy_wldev *dev) 154 { 155 } 156 157 #endif /* CONFIG_B43LEGACY_PIO */ 158 #endif /* B43legacy_PIO_H_ */ 159