1 #ifndef B43legacy_DMA_H_
2 #define B43legacy_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 "b43legacy.h"
11
12
13 /* DMA-Interrupt reasons. */
14 #define B43legacy_DMAIRQ_FATALMASK ((1 << 10) | (1 << 11) | (1 << 12) \
15 | (1 << 14) | (1 << 15))
16 #define B43legacy_DMAIRQ_NONFATALMASK (1 << 13)
17 #define B43legacy_DMAIRQ_RX_DONE (1 << 16)
18
19
20 /*** 32-bit DMA Engine. ***/
21
22 /* 32-bit DMA controller registers. */
23 #define B43legacy_DMA32_TXCTL 0x00
24 #define B43legacy_DMA32_TXENABLE 0x00000001
25 #define B43legacy_DMA32_TXSUSPEND 0x00000002
26 #define B43legacy_DMA32_TXLOOPBACK 0x00000004
27 #define B43legacy_DMA32_TXFLUSH 0x00000010
28 #define B43legacy_DMA32_TXADDREXT_MASK 0x00030000
29 #define B43legacy_DMA32_TXADDREXT_SHIFT 16
30 #define B43legacy_DMA32_TXRING 0x04
31 #define B43legacy_DMA32_TXINDEX 0x08
32 #define B43legacy_DMA32_TXSTATUS 0x0C
33 #define B43legacy_DMA32_TXDPTR 0x00000FFF
34 #define B43legacy_DMA32_TXSTATE 0x0000F000
35 #define B43legacy_DMA32_TXSTAT_DISABLED 0x00000000
36 #define B43legacy_DMA32_TXSTAT_ACTIVE 0x00001000
37 #define B43legacy_DMA32_TXSTAT_IDLEWAIT 0x00002000
38 #define B43legacy_DMA32_TXSTAT_STOPPED 0x00003000
39 #define B43legacy_DMA32_TXSTAT_SUSP 0x00004000
40 #define B43legacy_DMA32_TXERROR 0x000F0000
41 #define B43legacy_DMA32_TXERR_NOERR 0x00000000
42 #define B43legacy_DMA32_TXERR_PROT 0x00010000
43 #define B43legacy_DMA32_TXERR_UNDERRUN 0x00020000
44 #define B43legacy_DMA32_TXERR_BUFREAD 0x00030000
45 #define B43legacy_DMA32_TXERR_DESCREAD 0x00040000
46 #define B43legacy_DMA32_TXACTIVE 0xFFF00000
47 #define B43legacy_DMA32_RXCTL 0x10
48 #define B43legacy_DMA32_RXENABLE 0x00000001
49 #define B43legacy_DMA32_RXFROFF_MASK 0x000000FE
50 #define B43legacy_DMA32_RXFROFF_SHIFT 1
51 #define B43legacy_DMA32_RXDIRECTFIFO 0x00000100
52 #define B43legacy_DMA32_RXADDREXT_MASK 0x00030000
53 #define B43legacy_DMA32_RXADDREXT_SHIFT 16
54 #define B43legacy_DMA32_RXRING 0x14
55 #define B43legacy_DMA32_RXINDEX 0x18
56 #define B43legacy_DMA32_RXSTATUS 0x1C
57 #define B43legacy_DMA32_RXDPTR 0x00000FFF
58 #define B43legacy_DMA32_RXSTATE 0x0000F000
59 #define B43legacy_DMA32_RXSTAT_DISABLED 0x00000000
60 #define B43legacy_DMA32_RXSTAT_ACTIVE 0x00001000
61 #define B43legacy_DMA32_RXSTAT_IDLEWAIT 0x00002000
62 #define B43legacy_DMA32_RXSTAT_STOPPED 0x00003000
63 #define B43legacy_DMA32_RXERROR 0x000F0000
64 #define B43legacy_DMA32_RXERR_NOERR 0x00000000
65 #define B43legacy_DMA32_RXERR_PROT 0x00010000
66 #define B43legacy_DMA32_RXERR_OVERFLOW 0x00020000
67 #define B43legacy_DMA32_RXERR_BUFWRITE 0x00030000
68 #define B43legacy_DMA32_RXERR_DESCREAD 0x00040000
69 #define B43legacy_DMA32_RXACTIVE 0xFFF00000
70
71 /* 32-bit DMA descriptor. */
72 struct b43legacy_dmadesc32 {
73 __le32 control;
74 __le32 address;
75 } __packed;
76 #define B43legacy_DMA32_DCTL_BYTECNT 0x00001FFF
77 #define B43legacy_DMA32_DCTL_ADDREXT_MASK 0x00030000
78 #define B43legacy_DMA32_DCTL_ADDREXT_SHIFT 16
79 #define B43legacy_DMA32_DCTL_DTABLEEND 0x10000000
80 #define B43legacy_DMA32_DCTL_IRQ 0x20000000
81 #define B43legacy_DMA32_DCTL_FRAMEEND 0x40000000
82 #define B43legacy_DMA32_DCTL_FRAMESTART 0x80000000
83
84
85
86 /*** 64-bit DMA Engine. ***/
87
88 /* 64-bit DMA controller registers. */
89 #define B43legacy_DMA64_TXCTL 0x00
90 #define B43legacy_DMA64_TXENABLE 0x00000001
91 #define B43legacy_DMA64_TXSUSPEND 0x00000002
92 #define B43legacy_DMA64_TXLOOPBACK 0x00000004
93 #define B43legacy_DMA64_TXFLUSH 0x00000010
94 #define B43legacy_DMA64_TXADDREXT_MASK 0x00030000
95 #define B43legacy_DMA64_TXADDREXT_SHIFT 16
96 #define B43legacy_DMA64_TXINDEX 0x04
97 #define B43legacy_DMA64_TXRINGLO 0x08
98 #define B43legacy_DMA64_TXRINGHI 0x0C
99 #define B43legacy_DMA64_TXSTATUS 0x10
100 #define B43legacy_DMA64_TXSTATDPTR 0x00001FFF
101 #define B43legacy_DMA64_TXSTAT 0xF0000000
102 #define B43legacy_DMA64_TXSTAT_DISABLED 0x00000000
103 #define B43legacy_DMA64_TXSTAT_ACTIVE 0x10000000
104 #define B43legacy_DMA64_TXSTAT_IDLEWAIT 0x20000000
105 #define B43legacy_DMA64_TXSTAT_STOPPED 0x30000000
106 #define B43legacy_DMA64_TXSTAT_SUSP 0x40000000
107 #define B43legacy_DMA64_TXERROR 0x14
108 #define B43legacy_DMA64_TXERRDPTR 0x0001FFFF
109 #define B43legacy_DMA64_TXERR 0xF0000000
110 #define B43legacy_DMA64_TXERR_NOERR 0x00000000
111 #define B43legacy_DMA64_TXERR_PROT 0x10000000
112 #define B43legacy_DMA64_TXERR_UNDERRUN 0x20000000
113 #define B43legacy_DMA64_TXERR_TRANSFER 0x30000000
114 #define B43legacy_DMA64_TXERR_DESCREAD 0x40000000
115 #define B43legacy_DMA64_TXERR_CORE 0x50000000
116 #define B43legacy_DMA64_RXCTL 0x20
117 #define B43legacy_DMA64_RXENABLE 0x00000001
118 #define B43legacy_DMA64_RXFROFF_MASK 0x000000FE
119 #define B43legacy_DMA64_RXFROFF_SHIFT 1
120 #define B43legacy_DMA64_RXDIRECTFIFO 0x00000100
121 #define B43legacy_DMA64_RXADDREXT_MASK 0x00030000
122 #define B43legacy_DMA64_RXADDREXT_SHIFT 16
123 #define B43legacy_DMA64_RXINDEX 0x24
124 #define B43legacy_DMA64_RXRINGLO 0x28
125 #define B43legacy_DMA64_RXRINGHI 0x2C
126 #define B43legacy_DMA64_RXSTATUS 0x30
127 #define B43legacy_DMA64_RXSTATDPTR 0x00001FFF
128 #define B43legacy_DMA64_RXSTAT 0xF0000000
129 #define B43legacy_DMA64_RXSTAT_DISABLED 0x00000000
130 #define B43legacy_DMA64_RXSTAT_ACTIVE 0x10000000
131 #define B43legacy_DMA64_RXSTAT_IDLEWAIT 0x20000000
132 #define B43legacy_DMA64_RXSTAT_STOPPED 0x30000000
133 #define B43legacy_DMA64_RXSTAT_SUSP 0x40000000
134 #define B43legacy_DMA64_RXERROR 0x34
135 #define B43legacy_DMA64_RXERRDPTR 0x0001FFFF
136 #define B43legacy_DMA64_RXERR 0xF0000000
137 #define B43legacy_DMA64_RXERR_NOERR 0x00000000
138 #define B43legacy_DMA64_RXERR_PROT 0x10000000
139 #define B43legacy_DMA64_RXERR_UNDERRUN 0x20000000
140 #define B43legacy_DMA64_RXERR_TRANSFER 0x30000000
141 #define B43legacy_DMA64_RXERR_DESCREAD 0x40000000
142 #define B43legacy_DMA64_RXERR_CORE 0x50000000
143
144 /* 64-bit DMA descriptor. */
145 struct b43legacy_dmadesc64 {
146 __le32 control0;
147 __le32 control1;
148 __le32 address_low;
149 __le32 address_high;
150 } __packed;
151 #define B43legacy_DMA64_DCTL0_DTABLEEND 0x10000000
152 #define B43legacy_DMA64_DCTL0_IRQ 0x20000000
153 #define B43legacy_DMA64_DCTL0_FRAMEEND 0x40000000
154 #define B43legacy_DMA64_DCTL0_FRAMESTART 0x80000000
155 #define B43legacy_DMA64_DCTL1_BYTECNT 0x00001FFF
156 #define B43legacy_DMA64_DCTL1_ADDREXT_MASK 0x00030000
157 #define B43legacy_DMA64_DCTL1_ADDREXT_SHIFT 16
158
159
160
161 struct b43legacy_dmadesc_generic {
162 union {
163 struct b43legacy_dmadesc32 dma32;
164 struct b43legacy_dmadesc64 dma64;
165 } __packed;
166 } __packed;
167
168
169 /* Misc DMA constants */
170 #define B43legacy_DMA_RINGMEMSIZE PAGE_SIZE
171 #define B43legacy_DMA0_RX_FRAMEOFFSET 30
172 #define B43legacy_DMA3_RX_FRAMEOFFSET 0
173
174
175 /* DMA engine tuning knobs */
176 #define B43legacy_TXRING_SLOTS 128
177 #define B43legacy_RXRING_SLOTS 64
178 #define B43legacy_DMA0_RX_BUFFERSIZE (2304 + 100)
179 #define B43legacy_DMA3_RX_BUFFERSIZE 16
180
181
182
183 #ifdef CONFIG_B43LEGACY_DMA
184
185
186 struct sk_buff;
187 struct b43legacy_private;
188 struct b43legacy_txstatus;
189
190
191 struct b43legacy_dmadesc_meta {
192 /* The kernel DMA-able buffer. */
193 struct sk_buff *skb;
194 /* DMA base bus-address of the descriptor buffer. */
195 dma_addr_t dmaaddr;
196 /* ieee80211 TX status. Only used once per 802.11 frag. */
197 bool is_last_fragment;
198 };
199
200 struct b43legacy_dmaring;
201
202 /* Lowlevel DMA operations that differ between 32bit and 64bit DMA. */
203 struct b43legacy_dma_ops {
204 struct b43legacy_dmadesc_generic * (*idx2desc)
205 (struct b43legacy_dmaring *ring,
206 int slot,
207 struct b43legacy_dmadesc_meta
208 **meta);
209 void (*fill_descriptor)(struct b43legacy_dmaring *ring,
210 struct b43legacy_dmadesc_generic *desc,
211 dma_addr_t dmaaddr, u16 bufsize,
212 int start, int end, int irq);
213 void (*poke_tx)(struct b43legacy_dmaring *ring, int slot);
214 void (*tx_suspend)(struct b43legacy_dmaring *ring);
215 void (*tx_resume)(struct b43legacy_dmaring *ring);
216 int (*get_current_rxslot)(struct b43legacy_dmaring *ring);
217 void (*set_current_rxslot)(struct b43legacy_dmaring *ring, int slot);
218 };
219
220 enum b43legacy_dmatype {
221 B43legacy_DMA_30BIT = 30,
222 B43legacy_DMA_32BIT = 32,
223 B43legacy_DMA_64BIT = 64,
224 };
225
226 struct b43legacy_dmaring {
227 /* Lowlevel DMA ops. */
228 const struct b43legacy_dma_ops *ops;
229 /* Kernel virtual base address of the ring memory. */
230 void *descbase;
231 /* Meta data about all descriptors. */
232 struct b43legacy_dmadesc_meta *meta;
233 /* Cache of TX headers for each slot.
234 * This is to avoid an allocation on each TX.
235 * This is NULL for an RX ring.
236 */
237 u8 *txhdr_cache;
238 /* (Unadjusted) DMA base bus-address of the ring memory. */
239 dma_addr_t dmabase;
240 /* Number of descriptor slots in the ring. */
241 int nr_slots;
242 /* Number of used descriptor slots. */
243 int used_slots;
244 /* Currently used slot in the ring. */
245 int current_slot;
246 /* Frameoffset in octets. */
247 u32 frameoffset;
248 /* Descriptor buffer size. */
249 u16 rx_buffersize;
250 /* The MMIO base register of the DMA controller. */
251 u16 mmio_base;
252 /* DMA controller index number (0-5). */
253 int index;
254 /* Boolean. Is this a TX ring? */
255 bool tx;
256 /* The type of DMA engine used. */
257 enum b43legacy_dmatype type;
258 /* Boolean. Is this ring stopped at ieee80211 level? */
259 bool stopped;
260 /* Lock, only used for TX. */
261 spinlock_t lock;
262 struct b43legacy_wldev *dev;
263 #ifdef CONFIG_B43LEGACY_DEBUG
264 /* Maximum number of used slots. */
265 int max_used_slots;
266 /* Last time we injected a ring overflow. */
267 unsigned long last_injected_overflow;
268 #endif /* CONFIG_B43LEGACY_DEBUG*/
269 };
270
271
272 static inline
b43legacy_dma_read(struct b43legacy_dmaring * ring,u16 offset)273 u32 b43legacy_dma_read(struct b43legacy_dmaring *ring,
274 u16 offset)
275 {
276 return b43legacy_read32(ring->dev, ring->mmio_base + offset);
277 }
278
279 static inline
b43legacy_dma_write(struct b43legacy_dmaring * ring,u16 offset,u32 value)280 void b43legacy_dma_write(struct b43legacy_dmaring *ring,
281 u16 offset, u32 value)
282 {
283 b43legacy_write32(ring->dev, ring->mmio_base + offset, value);
284 }
285
286
287 int b43legacy_dma_init(struct b43legacy_wldev *dev);
288 void b43legacy_dma_free(struct b43legacy_wldev *dev);
289
290 void b43legacy_dma_tx_suspend(struct b43legacy_wldev *dev);
291 void b43legacy_dma_tx_resume(struct b43legacy_wldev *dev);
292
293 int b43legacy_dma_tx(struct b43legacy_wldev *dev,
294 struct sk_buff *skb);
295 void b43legacy_dma_handle_txstatus(struct b43legacy_wldev *dev,
296 const struct b43legacy_txstatus *status);
297
298 void b43legacy_dma_rx(struct b43legacy_dmaring *ring);
299
300 #else /* CONFIG_B43LEGACY_DMA */
301
302
303 static inline
b43legacy_dma_init(struct b43legacy_wldev * dev)304 int b43legacy_dma_init(struct b43legacy_wldev *dev)
305 {
306 return 0;
307 }
308 static inline
b43legacy_dma_free(struct b43legacy_wldev * dev)309 void b43legacy_dma_free(struct b43legacy_wldev *dev)
310 {
311 }
312 static inline
b43legacy_dma_tx(struct b43legacy_wldev * dev,struct sk_buff * skb)313 int b43legacy_dma_tx(struct b43legacy_wldev *dev,
314 struct sk_buff *skb)
315 {
316 return 0;
317 }
318 static inline
b43legacy_dma_handle_txstatus(struct b43legacy_wldev * dev,const struct b43legacy_txstatus * status)319 void b43legacy_dma_handle_txstatus(struct b43legacy_wldev *dev,
320 const struct b43legacy_txstatus *status)
321 {
322 }
323 static inline
b43legacy_dma_rx(struct b43legacy_dmaring * ring)324 void b43legacy_dma_rx(struct b43legacy_dmaring *ring)
325 {
326 }
327 static inline
b43legacy_dma_tx_suspend(struct b43legacy_wldev * dev)328 void b43legacy_dma_tx_suspend(struct b43legacy_wldev *dev)
329 {
330 }
331 static inline
b43legacy_dma_tx_resume(struct b43legacy_wldev * dev)332 void b43legacy_dma_tx_resume(struct b43legacy_wldev *dev)
333 {
334 }
335
336 #endif /* CONFIG_B43LEGACY_DMA */
337 #endif /* B43legacy_DMA_H_ */
338