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1 | #ifndef B43_DMA_H_ |
2 | #define B43_DMA_H_ | |
3 | ||
4 | #include <linux/list.h> | |
5 | #include <linux/spinlock.h> | |
6 | #include <linux/workqueue.h> | |
7 | #include <linux/linkage.h> | |
8 | #include <asm/atomic.h> | |
9 | ||
10 | #include "b43.h" | |
11 | ||
12 | /* DMA-Interrupt reasons. */ | |
13 | #define B43_DMAIRQ_FATALMASK ((1 << 10) | (1 << 11) | (1 << 12) \ | |
14 | | (1 << 14) | (1 << 15)) | |
15 | #define B43_DMAIRQ_NONFATALMASK (1 << 13) | |
16 | #define B43_DMAIRQ_RX_DONE (1 << 16) | |
17 | ||
18 | /*** 32-bit DMA Engine. ***/ | |
19 | ||
20 | /* 32-bit DMA controller registers. */ | |
21 | #define B43_DMA32_TXCTL 0x00 | |
22 | #define B43_DMA32_TXENABLE 0x00000001 | |
23 | #define B43_DMA32_TXSUSPEND 0x00000002 | |
24 | #define B43_DMA32_TXLOOPBACK 0x00000004 | |
25 | #define B43_DMA32_TXFLUSH 0x00000010 | |
26 | #define B43_DMA32_TXADDREXT_MASK 0x00030000 | |
27 | #define B43_DMA32_TXADDREXT_SHIFT 16 | |
28 | #define B43_DMA32_TXRING 0x04 | |
29 | #define B43_DMA32_TXINDEX 0x08 | |
30 | #define B43_DMA32_TXSTATUS 0x0C | |
31 | #define B43_DMA32_TXDPTR 0x00000FFF | |
32 | #define B43_DMA32_TXSTATE 0x0000F000 | |
33 | #define B43_DMA32_TXSTAT_DISABLED 0x00000000 | |
34 | #define B43_DMA32_TXSTAT_ACTIVE 0x00001000 | |
35 | #define B43_DMA32_TXSTAT_IDLEWAIT 0x00002000 | |
36 | #define B43_DMA32_TXSTAT_STOPPED 0x00003000 | |
37 | #define B43_DMA32_TXSTAT_SUSP 0x00004000 | |
38 | #define B43_DMA32_TXERROR 0x000F0000 | |
39 | #define B43_DMA32_TXERR_NOERR 0x00000000 | |
40 | #define B43_DMA32_TXERR_PROT 0x00010000 | |
41 | #define B43_DMA32_TXERR_UNDERRUN 0x00020000 | |
42 | #define B43_DMA32_TXERR_BUFREAD 0x00030000 | |
43 | #define B43_DMA32_TXERR_DESCREAD 0x00040000 | |
44 | #define B43_DMA32_TXACTIVE 0xFFF00000 | |
45 | #define B43_DMA32_RXCTL 0x10 | |
46 | #define B43_DMA32_RXENABLE 0x00000001 | |
47 | #define B43_DMA32_RXFROFF_MASK 0x000000FE | |
48 | #define B43_DMA32_RXFROFF_SHIFT 1 | |
49 | #define B43_DMA32_RXDIRECTFIFO 0x00000100 | |
50 | #define B43_DMA32_RXADDREXT_MASK 0x00030000 | |
51 | #define B43_DMA32_RXADDREXT_SHIFT 16 | |
52 | #define B43_DMA32_RXRING 0x14 | |
53 | #define B43_DMA32_RXINDEX 0x18 | |
54 | #define B43_DMA32_RXSTATUS 0x1C | |
55 | #define B43_DMA32_RXDPTR 0x00000FFF | |
56 | #define B43_DMA32_RXSTATE 0x0000F000 | |
57 | #define B43_DMA32_RXSTAT_DISABLED 0x00000000 | |
58 | #define B43_DMA32_RXSTAT_ACTIVE 0x00001000 | |
59 | #define B43_DMA32_RXSTAT_IDLEWAIT 0x00002000 | |
60 | #define B43_DMA32_RXSTAT_STOPPED 0x00003000 | |
61 | #define B43_DMA32_RXERROR 0x000F0000 | |
62 | #define B43_DMA32_RXERR_NOERR 0x00000000 | |
63 | #define B43_DMA32_RXERR_PROT 0x00010000 | |
64 | #define B43_DMA32_RXERR_OVERFLOW 0x00020000 | |
65 | #define B43_DMA32_RXERR_BUFWRITE 0x00030000 | |
66 | #define B43_DMA32_RXERR_DESCREAD 0x00040000 | |
67 | #define B43_DMA32_RXACTIVE 0xFFF00000 | |
68 | ||
69 | /* 32-bit DMA descriptor. */ | |
70 | struct b43_dmadesc32 { | |
71 | __le32 control; | |
72 | __le32 address; | |
73 | } __attribute__ ((__packed__)); | |
74 | #define B43_DMA32_DCTL_BYTECNT 0x00001FFF | |
75 | #define B43_DMA32_DCTL_ADDREXT_MASK 0x00030000 | |
76 | #define B43_DMA32_DCTL_ADDREXT_SHIFT 16 | |
77 | #define B43_DMA32_DCTL_DTABLEEND 0x10000000 | |
78 | #define B43_DMA32_DCTL_IRQ 0x20000000 | |
79 | #define B43_DMA32_DCTL_FRAMEEND 0x40000000 | |
80 | #define B43_DMA32_DCTL_FRAMESTART 0x80000000 | |
81 | ||
82 | /*** 64-bit DMA Engine. ***/ | |
83 | ||
84 | /* 64-bit DMA controller registers. */ | |
85 | #define B43_DMA64_TXCTL 0x00 | |
86 | #define B43_DMA64_TXENABLE 0x00000001 | |
87 | #define B43_DMA64_TXSUSPEND 0x00000002 | |
88 | #define B43_DMA64_TXLOOPBACK 0x00000004 | |
89 | #define B43_DMA64_TXFLUSH 0x00000010 | |
90 | #define B43_DMA64_TXADDREXT_MASK 0x00030000 | |
91 | #define B43_DMA64_TXADDREXT_SHIFT 16 | |
92 | #define B43_DMA64_TXINDEX 0x04 | |
93 | #define B43_DMA64_TXRINGLO 0x08 | |
94 | #define B43_DMA64_TXRINGHI 0x0C | |
95 | #define B43_DMA64_TXSTATUS 0x10 | |
96 | #define B43_DMA64_TXSTATDPTR 0x00001FFF | |
97 | #define B43_DMA64_TXSTAT 0xF0000000 | |
98 | #define B43_DMA64_TXSTAT_DISABLED 0x00000000 | |
99 | #define B43_DMA64_TXSTAT_ACTIVE 0x10000000 | |
100 | #define B43_DMA64_TXSTAT_IDLEWAIT 0x20000000 | |
101 | #define B43_DMA64_TXSTAT_STOPPED 0x30000000 | |
102 | #define B43_DMA64_TXSTAT_SUSP 0x40000000 | |
103 | #define B43_DMA64_TXERROR 0x14 | |
104 | #define B43_DMA64_TXERRDPTR 0x0001FFFF | |
105 | #define B43_DMA64_TXERR 0xF0000000 | |
106 | #define B43_DMA64_TXERR_NOERR 0x00000000 | |
107 | #define B43_DMA64_TXERR_PROT 0x10000000 | |
108 | #define B43_DMA64_TXERR_UNDERRUN 0x20000000 | |
109 | #define B43_DMA64_TXERR_TRANSFER 0x30000000 | |
110 | #define B43_DMA64_TXERR_DESCREAD 0x40000000 | |
111 | #define B43_DMA64_TXERR_CORE 0x50000000 | |
112 | #define B43_DMA64_RXCTL 0x20 | |
113 | #define B43_DMA64_RXENABLE 0x00000001 | |
114 | #define B43_DMA64_RXFROFF_MASK 0x000000FE | |
115 | #define B43_DMA64_RXFROFF_SHIFT 1 | |
116 | #define B43_DMA64_RXDIRECTFIFO 0x00000100 | |
117 | #define B43_DMA64_RXADDREXT_MASK 0x00030000 | |
118 | #define B43_DMA64_RXADDREXT_SHIFT 16 | |
119 | #define B43_DMA64_RXINDEX 0x24 | |
120 | #define B43_DMA64_RXRINGLO 0x28 | |
121 | #define B43_DMA64_RXRINGHI 0x2C | |
122 | #define B43_DMA64_RXSTATUS 0x30 | |
123 | #define B43_DMA64_RXSTATDPTR 0x00001FFF | |
124 | #define B43_DMA64_RXSTAT 0xF0000000 | |
125 | #define B43_DMA64_RXSTAT_DISABLED 0x00000000 | |
126 | #define B43_DMA64_RXSTAT_ACTIVE 0x10000000 | |
127 | #define B43_DMA64_RXSTAT_IDLEWAIT 0x20000000 | |
128 | #define B43_DMA64_RXSTAT_STOPPED 0x30000000 | |
129 | #define B43_DMA64_RXSTAT_SUSP 0x40000000 | |
130 | #define B43_DMA64_RXERROR 0x34 | |
131 | #define B43_DMA64_RXERRDPTR 0x0001FFFF | |
132 | #define B43_DMA64_RXERR 0xF0000000 | |
133 | #define B43_DMA64_RXERR_NOERR 0x00000000 | |
134 | #define B43_DMA64_RXERR_PROT 0x10000000 | |
135 | #define B43_DMA64_RXERR_UNDERRUN 0x20000000 | |
136 | #define B43_DMA64_RXERR_TRANSFER 0x30000000 | |
137 | #define B43_DMA64_RXERR_DESCREAD 0x40000000 | |
138 | #define B43_DMA64_RXERR_CORE 0x50000000 | |
139 | ||
140 | /* 64-bit DMA descriptor. */ | |
141 | struct b43_dmadesc64 { | |
142 | __le32 control0; | |
143 | __le32 control1; | |
144 | __le32 address_low; | |
145 | __le32 address_high; | |
146 | } __attribute__ ((__packed__)); | |
147 | #define B43_DMA64_DCTL0_DTABLEEND 0x10000000 | |
148 | #define B43_DMA64_DCTL0_IRQ 0x20000000 | |
149 | #define B43_DMA64_DCTL0_FRAMEEND 0x40000000 | |
150 | #define B43_DMA64_DCTL0_FRAMESTART 0x80000000 | |
151 | #define B43_DMA64_DCTL1_BYTECNT 0x00001FFF | |
152 | #define B43_DMA64_DCTL1_ADDREXT_MASK 0x00030000 | |
153 | #define B43_DMA64_DCTL1_ADDREXT_SHIFT 16 | |
154 | ||
155 | struct b43_dmadesc_generic { | |
156 | union { | |
157 | struct b43_dmadesc32 dma32; | |
158 | struct b43_dmadesc64 dma64; | |
159 | } __attribute__ ((__packed__)); | |
160 | } __attribute__ ((__packed__)); | |
161 | ||
162 | /* Misc DMA constants */ | |
163 | #define B43_DMA_RINGMEMSIZE PAGE_SIZE | |
164 | #define B43_DMA0_RX_FRAMEOFFSET 30 | |
165 | #define B43_DMA3_RX_FRAMEOFFSET 0 | |
166 | ||
167 | /* DMA engine tuning knobs */ | |
168 | #define B43_TXRING_SLOTS 128 | |
169 | #define B43_RXRING_SLOTS 64 | |
170 | #define B43_DMA0_RX_BUFFERSIZE (2304 + 100) | |
171 | #define B43_DMA3_RX_BUFFERSIZE 16 | |
172 | ||
173 | #ifdef CONFIG_B43_DMA | |
174 | ||
175 | struct sk_buff; | |
176 | struct b43_private; | |
177 | struct b43_txstatus; | |
178 | ||
179 | struct b43_dmadesc_meta { | |
180 | /* The kernel DMA-able buffer. */ | |
181 | struct sk_buff *skb; | |
182 | /* DMA base bus-address of the descriptor buffer. */ | |
183 | dma_addr_t dmaaddr; | |
184 | /* ieee80211 TX status. Only used once per 802.11 frag. */ | |
185 | bool is_last_fragment; | |
186 | struct ieee80211_tx_status txstat; | |
187 | }; | |
188 | ||
189 | struct b43_dmaring; | |
190 | ||
191 | /* Lowlevel DMA operations that differ between 32bit and 64bit DMA. */ | |
192 | struct b43_dma_ops { | |
193 | struct b43_dmadesc_generic *(*idx2desc) (struct b43_dmaring * ring, | |
194 | int slot, | |
195 | struct b43_dmadesc_meta ** | |
196 | meta); | |
197 | void (*fill_descriptor) (struct b43_dmaring * ring, | |
198 | struct b43_dmadesc_generic * desc, | |
199 | dma_addr_t dmaaddr, u16 bufsize, int start, | |
200 | int end, int irq); | |
201 | void (*poke_tx) (struct b43_dmaring * ring, int slot); | |
202 | void (*tx_suspend) (struct b43_dmaring * ring); | |
203 | void (*tx_resume) (struct b43_dmaring * ring); | |
204 | int (*get_current_rxslot) (struct b43_dmaring * ring); | |
205 | void (*set_current_rxslot) (struct b43_dmaring * ring, int slot); | |
206 | }; | |
207 | ||
208 | struct b43_dmaring { | |
209 | /* Lowlevel DMA ops. */ | |
210 | const struct b43_dma_ops *ops; | |
211 | /* Kernel virtual base address of the ring memory. */ | |
212 | void *descbase; | |
213 | /* Meta data about all descriptors. */ | |
214 | struct b43_dmadesc_meta *meta; | |
215 | /* Cache of TX headers for each slot. | |
216 | * This is to avoid an allocation on each TX. | |
217 | * This is NULL for an RX ring. | |
218 | */ | |
219 | u8 *txhdr_cache; | |
220 | /* (Unadjusted) DMA base bus-address of the ring memory. */ | |
221 | dma_addr_t dmabase; | |
222 | /* Number of descriptor slots in the ring. */ | |
223 | int nr_slots; | |
224 | /* Number of used descriptor slots. */ | |
225 | int used_slots; | |
226 | /* Currently used slot in the ring. */ | |
227 | int current_slot; | |
228 | /* Total number of packets sent. Statistics only. */ | |
229 | unsigned int nr_tx_packets; | |
230 | /* Frameoffset in octets. */ | |
231 | u32 frameoffset; | |
232 | /* Descriptor buffer size. */ | |
233 | u16 rx_buffersize; | |
234 | /* The MMIO base register of the DMA controller. */ | |
235 | u16 mmio_base; | |
236 | /* DMA controller index number (0-5). */ | |
237 | int index; | |
238 | /* Boolean. Is this a TX ring? */ | |
239 | bool tx; | |
240 | /* Boolean. 64bit DMA if true, 32bit DMA otherwise. */ | |
241 | bool dma64; | |
242 | /* Boolean. Is this ring stopped at ieee80211 level? */ | |
243 | bool stopped; | |
244 | /* Lock, only used for TX. */ | |
245 | spinlock_t lock; | |
246 | struct b43_wldev *dev; | |
247 | #ifdef CONFIG_B43_DEBUG | |
248 | /* Maximum number of used slots. */ | |
249 | int max_used_slots; | |
250 | /* Last time we injected a ring overflow. */ | |
251 | unsigned long last_injected_overflow; | |
252 | #endif /* CONFIG_B43_DEBUG */ | |
253 | }; | |
254 | ||
255 | static inline u32 b43_dma_read(struct b43_dmaring *ring, u16 offset) | |
256 | { | |
257 | return b43_read32(ring->dev, ring->mmio_base + offset); | |
258 | } | |
259 | ||
260 | static inline | |
261 | void b43_dma_write(struct b43_dmaring *ring, u16 offset, u32 value) | |
262 | { | |
263 | b43_write32(ring->dev, ring->mmio_base + offset, value); | |
264 | } | |
265 | ||
266 | int b43_dma_init(struct b43_wldev *dev); | |
267 | void b43_dma_free(struct b43_wldev *dev); | |
268 | ||
269 | int b43_dmacontroller_rx_reset(struct b43_wldev *dev, | |
270 | u16 dmacontroller_mmio_base, int dma64); | |
271 | int b43_dmacontroller_tx_reset(struct b43_wldev *dev, | |
272 | u16 dmacontroller_mmio_base, int dma64); | |
273 | ||
274 | u16 b43_dmacontroller_base(int dma64bit, int dmacontroller_idx); | |
275 | ||
276 | void b43_dma_tx_suspend(struct b43_wldev *dev); | |
277 | void b43_dma_tx_resume(struct b43_wldev *dev); | |
278 | ||
279 | void b43_dma_get_tx_stats(struct b43_wldev *dev, | |
280 | struct ieee80211_tx_queue_stats *stats); | |
281 | ||
282 | int b43_dma_tx(struct b43_wldev *dev, | |
283 | struct sk_buff *skb, struct ieee80211_tx_control *ctl); | |
284 | void b43_dma_handle_txstatus(struct b43_wldev *dev, | |
285 | const struct b43_txstatus *status); | |
286 | ||
287 | void b43_dma_rx(struct b43_dmaring *ring); | |
288 | ||
289 | #else /* CONFIG_B43_DMA */ | |
290 | ||
291 | static inline int b43_dma_init(struct b43_wldev *dev) | |
292 | { | |
293 | return 0; | |
294 | } | |
295 | static inline void b43_dma_free(struct b43_wldev *dev) | |
296 | { | |
297 | } | |
298 | static inline | |
299 | int b43_dmacontroller_rx_reset(struct b43_wldev *dev, | |
300 | u16 dmacontroller_mmio_base, int dma64) | |
301 | { | |
302 | return 0; | |
303 | } | |
304 | static inline | |
305 | int b43_dmacontroller_tx_reset(struct b43_wldev *dev, | |
306 | u16 dmacontroller_mmio_base, int dma64) | |
307 | { | |
308 | return 0; | |
309 | } | |
310 | static inline | |
311 | void b43_dma_get_tx_stats(struct b43_wldev *dev, | |
312 | struct ieee80211_tx_queue_stats *stats) | |
313 | { | |
314 | } | |
315 | static inline | |
316 | int b43_dma_tx(struct b43_wldev *dev, | |
317 | struct sk_buff *skb, struct ieee80211_tx_control *ctl) | |
318 | { | |
319 | return 0; | |
320 | } | |
321 | static inline | |
322 | void b43_dma_handle_txstatus(struct b43_wldev *dev, | |
323 | const struct b43_txstatus *status) | |
324 | { | |
325 | } | |
326 | static inline void b43_dma_rx(struct b43_dmaring *ring) | |
327 | { | |
328 | } | |
329 | static inline void b43_dma_tx_suspend(struct b43_wldev *dev) | |
330 | { | |
331 | } | |
332 | static inline void b43_dma_tx_resume(struct b43_wldev *dev) | |
333 | { | |
334 | } | |
335 | ||
336 | #endif /* CONFIG_B43_DMA */ | |
337 | #endif /* B43_DMA_H_ */ |