aboutsummaryrefslogtreecommitdiff
path: root/drivers/net/wireless/b43/dma.h
blob: 20acf885dba5aa1d215452039226a665da055689 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
#ifndef B43_DMA_H_
#define B43_DMA_H_

#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/workqueue.h>
#include <linux/linkage.h>
#include <asm/atomic.h>

#include "b43.h"

/* DMA-Interrupt reasons. */
#define B43_DMAIRQ_FATALMASK	((1 << 10) | (1 << 11) | (1 << 12) \
					 | (1 << 14) | (1 << 15))
#define B43_DMAIRQ_NONFATALMASK	(1 << 13)
#define B43_DMAIRQ_RX_DONE		(1 << 16)

/*** 32-bit DMA Engine. ***/

/* 32-bit DMA controller registers. */
#define B43_DMA32_TXCTL				0x00
#define		B43_DMA32_TXENABLE			0x00000001
#define		B43_DMA32_TXSUSPEND			0x00000002
#define		B43_DMA32_TXLOOPBACK		0x00000004
#define		B43_DMA32_TXFLUSH			0x00000010
#define		B43_DMA32_TXADDREXT_MASK		0x00030000
#define		B43_DMA32_TXADDREXT_SHIFT		16
#define B43_DMA32_TXRING				0x04
#define B43_DMA32_TXINDEX				0x08
#define B43_DMA32_TXSTATUS				0x0C
#define		B43_DMA32_TXDPTR			0x00000FFF
#define		B43_DMA32_TXSTATE			0x0000F000
#define			B43_DMA32_TXSTAT_DISABLED	0x00000000
#define			B43_DMA32_TXSTAT_ACTIVE	0x00001000
#define			B43_DMA32_TXSTAT_IDLEWAIT	0x00002000
#define			B43_DMA32_TXSTAT_STOPPED	0x00003000
#define			B43_DMA32_TXSTAT_SUSP	0x00004000
#define		B43_DMA32_TXERROR			0x000F0000
#define			B43_DMA32_TXERR_NOERR	0x00000000
#define			B43_DMA32_TXERR_PROT	0x00010000
#define			B43_DMA32_TXERR_UNDERRUN	0x00020000
#define			B43_DMA32_TXERR_BUFREAD	0x00030000
#define			B43_DMA32_TXERR_DESCREAD	0x00040000
#define		B43_DMA32_TXACTIVE			0xFFF00000
#define B43_DMA32_RXCTL				0x10
#define		B43_DMA32_RXENABLE			0x00000001
#define		B43_DMA32_RXFROFF_MASK		0x000000FE
#define		B43_DMA32_RXFROFF_SHIFT		1
#define		B43_DMA32_RXDIRECTFIFO		0x00000100
#define		B43_DMA32_RXADDREXT_MASK		0x00030000
#define		B43_DMA32_RXADDREXT_SHIFT		16
#define B43_DMA32_RXRING				0x14
#define B43_DMA32_RXINDEX				0x18
#define B43_DMA32_RXSTATUS				0x1C
#define		B43_DMA32_RXDPTR			0x00000FFF
#define		B43_DMA32_RXSTATE			0x0000F000
#define			B43_DMA32_RXSTAT_DISABLED	0x00000000
#define			B43_DMA32_RXSTAT_ACTIVE	0x00001000
#define			B43_DMA32_RXSTAT_IDLEWAIT	0x00002000
#define			B43_DMA32_RXSTAT_STOPPED	0x00003000
#define		B43_DMA32_RXERROR			0x000F0000
#define			B43_DMA32_RXERR_NOERR	0x00000000
#define			B43_DMA32_RXERR_PROT	0x00010000
#define			B43_DMA32_RXERR_OVERFLOW	0x00020000
#define			B43_DMA32_RXERR_BUFWRITE	0x00030000
#define			B43_DMA32_RXERR_DESCREAD	0x00040000
#define		B43_DMA32_RXACTIVE			0xFFF00000

/* 32-bit DMA descriptor. */
struct b43_dmadesc32 {
	__le32 control;
	__le32 address;
} __attribute__ ((__packed__));
#define B43_DMA32_DCTL_BYTECNT		0x00001FFF
#define B43_DMA32_DCTL_ADDREXT_MASK		0x00030000
#define B43_DMA32_DCTL_ADDREXT_SHIFT	16
#define B43_DMA32_DCTL_DTABLEEND		0x10000000
#define B43_DMA32_DCTL_IRQ			0x20000000
#define B43_DMA32_DCTL_FRAMEEND		0x40000000
#define B43_DMA32_DCTL_FRAMESTART		0x80000000

/*** 64-bit DMA Engine. ***/

/* 64-bit DMA controller registers. */
#define B43_DMA64_TXCTL				0x00
#define		B43_DMA64_TXENABLE			0x00000001
#define		B43_DMA64_TXSUSPEND			0x00000002
#define		B43_DMA64_TXLOOPBACK		0x00000004
#define		B43_DMA64_TXFLUSH			0x00000010
#define		B43_DMA64_TXADDREXT_MASK		0x00030000
#define		B43_DMA64_TXADDREXT_SHIFT		16
#define B43_DMA64_TXINDEX				0x04
#define B43_DMA64_TXRINGLO				0x08
#define B43_DMA64_TXRINGHI				0x0C
#define B43_DMA64_TXSTATUS				0x10
#define		B43_DMA64_TXSTATDPTR		0x00001FFF
#define		B43_DMA64_TXSTAT			0xF0000000
#define			B43_DMA64_TXSTAT_DISABLED	0x00000000
#define			B43_DMA64_TXSTAT_ACTIVE	0x10000000
#define			B43_DMA64_TXSTAT_IDLEWAIT	0x20000000
#define			B43_DMA64_TXSTAT_STOPPED	0x30000000
#define			B43_DMA64_TXSTAT_SUSP	0x40000000
#define B43_DMA64_TXERROR				0x14
#define		B43_DMA64_TXERRDPTR			0x0001FFFF
#define		B43_DMA64_TXERR			0xF0000000
#define			B43_DMA64_TXERR_NOERR	0x00000000
#define			B43_DMA64_TXERR_PROT	0x10000000
#define			B43_DMA64_TXERR_UNDERRUN	0x20000000
#define			B43_DMA64_TXERR_TRANSFER	0x30000000
#define			B43_DMA64_TXERR_DESCREAD	0x40000000
#define			B43_DMA64_TXERR_CORE	0x50000000
#define B43_DMA64_RXCTL				0x20
#define		B43_DMA64_RXENABLE			0x00000001
#define		B43_DMA64_RXFROFF_MASK		0x000000FE
#define		B43_DMA64_RXFROFF_SHIFT		1
#define		B43_DMA64_RXDIRECTFIFO		0x00000100
#define		B43_DMA64_RXADDREXT_MASK		0x00030000
#define		B43_DMA64_RXADDREXT_SHIFT		16
#define B43_DMA64_RXINDEX				0x24
#define B43_DMA64_RXRINGLO				0x28
#define B43_DMA64_RXRINGHI				0x2C
#define B43_DMA64_RXSTATUS				0x30
#define		B43_DMA64_RXSTATDPTR		0x00001FFF
#define		B43_DMA64_RXSTAT			0xF0000000
#define			B43_DMA64_RXSTAT_DISABLED	0x00000000
#define			B43_DMA64_RXSTAT_ACTIVE	0x10000000
#define			B43_DMA64_RXSTAT_IDLEWAIT	0x20000000
#define			B43_DMA64_RXSTAT_STOPPED	0x30000000
#define			B43_DMA64_RXSTAT_SUSP	0x40000000
#define B43_DMA64_RXERROR				0x34
#define		B43_DMA64_RXERRDPTR			0x0001FFFF
#define		B43_DMA64_RXERR			0xF0000000
#define			B43_DMA64_RXERR_NOERR	0x00000000
#define			B43_DMA64_RXERR_PROT	0x10000000
#define			B43_DMA64_RXERR_UNDERRUN	0x20000000
#define			B43_DMA64_RXERR_TRANSFER	0x30000000
#define			B43_DMA64_RXERR_DESCREAD	0x40000000
#define			B43_DMA64_RXERR_CORE	0x50000000

/* 64-bit DMA descriptor. */
struct b43_dmadesc64 {
	__le32 control0;
	__le32 control1;
	__le32 address_low;
	__le32 address_high;
} __attribute__ ((__packed__));
#define B43_DMA64_DCTL0_DTABLEEND		0x10000000
#define B43_DMA64_DCTL0_IRQ			0x20000000
#define B43_DMA64_DCTL0_FRAMEEND		0x40000000
#define B43_DMA64_DCTL0_FRAMESTART		0x80000000
#define B43_DMA64_DCTL1_BYTECNT		0x00001FFF
#define B43_DMA64_DCTL1_ADDREXT_MASK	0x00030000
#define B43_DMA64_DCTL1_ADDREXT_SHIFT	16

struct b43_dmadesc_generic {
	union {
		struct b43_dmadesc32 dma32;
		struct b43_dmadesc64 dma64;
	} __attribute__ ((__packed__));
} __attribute__ ((__packed__));

/* Misc DMA constants */
#define B43_DMA_RINGMEMSIZE		PAGE_SIZE
#define B43_DMA0_RX_FRAMEOFFSET	30
#define B43_DMA3_RX_FRAMEOFFSET	0

/* DMA engine tuning knobs */
#define B43_TXRING_SLOTS		128
#define B43_RXRING_SLOTS		64
#define B43_DMA0_RX_BUFFERSIZE	(2304 + 100)
#define B43_DMA3_RX_BUFFERSIZE	16

struct sk_buff;
struct b43_private;
struct b43_txstatus;

struct b43_dmadesc_meta {
	/* The kernel DMA-able buffer. */
	struct sk_buff *skb;
	/* DMA base bus-address of the descriptor buffer. */
	dma_addr_t dmaaddr;
	/* ieee80211 TX status. Only used once per 802.11 frag. */
	bool is_last_fragment;
	struct ieee80211_tx_status txstat;
};

struct b43_dmaring;

/* Lowlevel DMA operations that differ between 32bit and 64bit DMA. */
struct b43_dma_ops {
	struct b43_dmadesc_generic *(*idx2desc) (struct b43_dmaring * ring,
						 int slot,
						 struct b43_dmadesc_meta **
						 meta);
	void (*fill_descriptor) (struct b43_dmaring * ring,
				 struct b43_dmadesc_generic * desc,
				 dma_addr_t dmaaddr, u16 bufsize, int start,
				 int end, int irq);
	void (*poke_tx) (struct b43_dmaring * ring, int slot);
	void (*tx_suspend) (struct b43_dmaring * ring);
	void (*tx_resume) (struct b43_dmaring * ring);
	int (*get_current_rxslot) (struct b43_dmaring * ring);
	void (*set_current_rxslot) (struct b43_dmaring * ring, int slot);
};

enum b43_dmatype {
	B43_DMA_30BIT	= 30,
	B43_DMA_32BIT	= 32,
	B43_DMA_64BIT	= 64,
};

struct b43_dmaring {
	/* Lowlevel DMA ops. */
	const struct b43_dma_ops *ops;
	/* Kernel virtual base address of the ring memory. */
	void *descbase;
	/* Meta data about all descriptors. */
	struct b43_dmadesc_meta *meta;
	/* Cache of TX headers for each slot.
	 * This is to avoid an allocation on each TX.
	 * This is NULL for an RX ring.
	 */
	u8 *txhdr_cache;
	/* (Unadjusted) DMA base bus-address of the ring memory. */
	dma_addr_t dmabase;
	/* Number of descriptor slots in the ring. */
	int nr_slots;
	/* Number of used descriptor slots. */
	int used_slots;
	/* Currently used slot in the ring. */
	int current_slot;
	/* Total number of packets sent. Statistics only. */
	unsigned int nr_tx_packets;
	/* Frameoffset in octets. */
	u32 frameoffset;
	/* Descriptor buffer size. */
	u16 rx_buffersize;
	/* The MMIO base register of the DMA controller. */
	u16 mmio_base;
	/* DMA controller index number (0-5). */
	int index;
	/* Boolean. Is this a TX ring? */
	bool tx;
	/* The type of DMA engine used. */
	enum b43_dmatype type;
	/* Boolean. Is this ring stopped at ieee80211 level? */
	bool stopped;
	/* The QOS priority assigned to this ring. Only used for TX rings.
	 * This is the mac80211 "queue" value. */
	u8 queue_prio;
	/* Lock, only used for TX. */
	spinlock_t lock;
	struct b43_wldev *dev;
#ifdef CONFIG_B43_DEBUG
	/* Maximum number of used slots. */
	int max_used_slots;
	/* Last time we injected a ring overflow. */
	unsigned long last_injected_overflow;
	/* Statistics: Number of successfully transmitted packets */
	u64 nr_succeed_tx_packets;
	/* Statistics: Number of failed TX packets */
	u64 nr_failed_tx_packets;
	/* Statistics: Total number of TX plus all retries. */
	u64 nr_total_packet_tries;
#endif /* CONFIG_B43_DEBUG */
};

static inline u32 b43_dma_read(struct b43_dmaring *ring, u16 offset)
{
	return b43_read32(ring->dev, ring->mmio_base + offset);
}

static inline void b43_dma_write(struct b43_dmaring *ring, u16 offset, u32 value)
{
	b43_write32(ring->dev, ring->mmio_base + offset, value);
}

int b43_dma_init(struct b43_wldev *dev);
void b43_dma_free(struct b43_wldev *dev);

void b43_dma_tx_suspend(struct b43_wldev *dev);
void b43_dma_tx_resume(struct b43_wldev *dev);

void b43_dma_get_tx_stats(struct b43_wldev *dev,
			  struct ieee80211_tx_queue_stats *stats);

int b43_dma_tx(struct b43_wldev *dev,
	       struct sk_buff *skb, struct ieee80211_tx_control *ctl);
void b43_dma_handle_txstatus(struct b43_wldev *dev,
			     const struct b43_txstatus *status);

void b43_dma_rx(struct b43_dmaring *ring);

void b43_dma_direct_fifo_rx(struct b43_wldev *dev,
			    unsigned int engine_index, bool enable);

#endif /* B43_DMA_H_ */