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 mmiowb(); 96 } 97 98 99 int b43legacy_pio_init(struct b43legacy_wldev *dev); 100 void b43legacy_pio_free(struct b43legacy_wldev *dev); 101 102 int b43legacy_pio_tx(struct b43legacy_wldev *dev, 103 struct sk_buff *skb); 104 void b43legacy_pio_handle_txstatus(struct b43legacy_wldev *dev, 105 const struct b43legacy_txstatus *status); 106 void b43legacy_pio_rx(struct b43legacy_pioqueue *queue); 107 108 /* Suspend TX queue in hardware. */ 109 void b43legacy_pio_tx_suspend(struct b43legacy_pioqueue *queue); 110 void b43legacy_pio_tx_resume(struct b43legacy_pioqueue *queue); 111 /* Suspend (freeze) the TX tasklet (software level). */ 112 void b43legacy_pio_freeze_txqueues(struct b43legacy_wldev *dev); 113 void b43legacy_pio_thaw_txqueues(struct b43legacy_wldev *dev); 114 115 #else /* CONFIG_B43LEGACY_PIO */ 116 117 static inline 118 int b43legacy_pio_init(struct b43legacy_wldev *dev) 119 { 120 return 0; 121 } 122 static inline 123 void b43legacy_pio_free(struct b43legacy_wldev *dev) 124 { 125 } 126 static inline 127 int b43legacy_pio_tx(struct b43legacy_wldev *dev, 128 struct sk_buff *skb) 129 { 130 return 0; 131 } 132 static inline 133 void b43legacy_pio_handle_txstatus(struct b43legacy_wldev *dev, 134 const struct b43legacy_txstatus *status) 135 { 136 } 137 static inline 138 void b43legacy_pio_rx(struct b43legacy_pioqueue *queue) 139 { 140 } 141 static inline 142 void b43legacy_pio_tx_suspend(struct b43legacy_pioqueue *queue) 143 { 144 } 145 static inline 146 void b43legacy_pio_tx_resume(struct b43legacy_pioqueue *queue) 147 { 148 } 149 static inline 150 void b43legacy_pio_freeze_txqueues(struct b43legacy_wldev *dev) 151 { 152 } 153 static inline 154 void b43legacy_pio_thaw_txqueues(struct b43legacy_wldev *dev) 155 { 156 } 157 158 #endif /* CONFIG_B43LEGACY_PIO */ 159 #endif /* B43legacy_PIO_H_ */ 160