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
|
#ifndef BCM43xx_DMA_H_
#define BCM43xx_DMA_H_
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/workqueue.h>
#include <linux/linkage.h>
#include <asm/atomic.h>
/* DMA-Interrupt reasons. */
#define BCM43xx_DMAIRQ_FATALMASK ((1 << 10) | (1 << 11) | (1 << 12) \
| (1 << 14) | (1 << 15))
#define BCM43xx_DMAIRQ_NONFATALMASK (1 << 13)
#define BCM43xx_DMAIRQ_RX_DONE (1 << 16)
/* DMA controller register offsets. (relative to BCM43xx_DMA#_BASE) */
#define BCM43xx_DMA_TX_CONTROL 0x00
#define BCM43xx_DMA_TX_DESC_RING 0x04
#define BCM43xx_DMA_TX_DESC_INDEX 0x08
#define BCM43xx_DMA_TX_STATUS 0x0c
#define BCM43xx_DMA_RX_CONTROL 0x10
#define BCM43xx_DMA_RX_DESC_RING 0x14
#define BCM43xx_DMA_RX_DESC_INDEX 0x18
#define BCM43xx_DMA_RX_STATUS 0x1c
/* DMA controller channel control word values. */
#define BCM43xx_DMA_TXCTRL_ENABLE (1 << 0)
#define BCM43xx_DMA_TXCTRL_SUSPEND (1 << 1)
#define BCM43xx_DMA_TXCTRL_LOOPBACK (1 << 2)
#define BCM43xx_DMA_TXCTRL_FLUSH (1 << 4)
#define BCM43xx_DMA_RXCTRL_ENABLE (1 << 0)
#define BCM43xx_DMA_RXCTRL_FRAMEOFF_MASK 0x000000fe
#define BCM43xx_DMA_RXCTRL_FRAMEOFF_SHIFT 1
#define BCM43xx_DMA_RXCTRL_PIO (1 << 8)
/* DMA controller channel status word values. */
#define BCM43xx_DMA_TXSTAT_DPTR_MASK 0x00000fff
#define BCM43xx_DMA_TXSTAT_STAT_MASK 0x0000f000
#define BCM43xx_DMA_TXSTAT_STAT_DISABLED 0x00000000
#define BCM43xx_DMA_TXSTAT_STAT_ACTIVE 0x00001000
#define BCM43xx_DMA_TXSTAT_STAT_IDLEWAIT 0x00002000
#define BCM43xx_DMA_TXSTAT_STAT_STOPPED 0x00003000
#define BCM43xx_DMA_TXSTAT_STAT_SUSP 0x00004000
#define BCM43xx_DMA_TXSTAT_ERROR_MASK 0x000f0000
#define BCM43xx_DMA_TXSTAT_FLUSHED (1 << 20)
#define BCM43xx_DMA_RXSTAT_DPTR_MASK 0x00000fff
#define BCM43xx_DMA_RXSTAT_STAT_MASK 0x0000f000
#define BCM43xx_DMA_RXSTAT_STAT_DISABLED 0x00000000
#define BCM43xx_DMA_RXSTAT_STAT_ACTIVE 0x00001000
#define BCM43xx_DMA_RXSTAT_STAT_IDLEWAIT 0x00002000
#define BCM43xx_DMA_RXSTAT_STAT_RESERVED 0x00003000
#define BCM43xx_DMA_RXSTAT_STAT_ERRORS 0x00004000
#define BCM43xx_DMA_RXSTAT_ERROR_MASK 0x000f0000
/* DMA descriptor control field values. */
#define BCM43xx_DMADTOR_BYTECNT_MASK 0x00001fff
#define BCM43xx_DMADTOR_DTABLEEND (1 << 28) /* End of descriptor table */
#define BCM43xx_DMADTOR_COMPIRQ (1 << 29) /* IRQ on completion request */
#define BCM43xx_DMADTOR_FRAMEEND (1 << 30)
#define BCM43xx_DMADTOR_FRAMESTART (1 << 31)
/* Misc DMA constants */
#define BCM43xx_DMA_RINGMEMSIZE PAGE_SIZE
#define BCM43xx_DMA_BUSADDRMAX 0x3FFFFFFF
#define BCM43xx_DMA_DMABUSADDROFFSET (1 << 30)
#define BCM43xx_DMA1_RX_FRAMEOFFSET 30
#define BCM43xx_DMA4_RX_FRAMEOFFSET 0
/* DMA engine tuning knobs */
#define BCM43xx_TXRING_SLOTS 512
#define BCM43xx_RXRING_SLOTS 64
#define BCM43xx_DMA1_RXBUFFERSIZE (2304 + 100)
#define BCM43xx_DMA4_RXBUFFERSIZE 16
/* Suspend the tx queue, if less than this percent slots are free. */
#define BCM43xx_TXSUSPEND_PERCENT 20
/* Resume the tx queue, if more than this percent slots are free. */
#define BCM43xx_TXRESUME_PERCENT 50
#ifdef CONFIG_BCM43XX_DMA
struct sk_buff;
struct bcm43xx_private;
struct bcm43xx_xmitstatus;
struct bcm43xx_dmadesc {
__le32 _control;
__le32 _address;
} __attribute__((__packed__));
/* Macros to access the bcm43xx_dmadesc struct */
#define get_desc_ctl(desc) le32_to_cpu((desc)->_control)
#define set_desc_ctl(desc, ctl) do { (desc)->_control = cpu_to_le32(ctl); } while (0)
#define get_desc_addr(desc) le32_to_cpu((desc)->_address)
#define set_desc_addr(desc, addr) do { (desc)->_address = cpu_to_le32(addr); } while (0)
struct bcm43xx_dmadesc_meta {
/* The kernel DMA-able buffer. */
struct sk_buff *skb;
/* DMA base bus-address of the descriptor buffer. */
dma_addr_t dmaaddr;
};
struct bcm43xx_dmaring {
struct bcm43xx_private *bcm;
/* Kernel virtual base address of the ring memory. */
struct bcm43xx_dmadesc *vbase;
/* DMA memory offset */
dma_addr_t memoffset;
/* (Unadjusted) DMA base bus-address of the ring memory. */
dma_addr_t dmabase;
/* Meta data about all descriptors. */
struct bcm43xx_dmadesc_meta *meta;
/* 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;
/* Marks to suspend/resume the queue. */
int suspend_mark;
int resume_mark;
/* Frameoffset in octets. */
u32 frameoffset;
/* Descriptor buffer size. */
u16 rx_buffersize;
/* The MMIO base register of the DMA controller, this
* ring is posted to.
*/
u16 mmio_base;
u8 tx:1, /* TRUE, if this is a TX ring. */
suspended:1; /* TRUE, if transfers are suspended on this ring. */
#ifdef CONFIG_BCM43XX_DEBUG
/* Maximum number of used slots. */
int max_used_slots;
#endif /* CONFIG_BCM43XX_DEBUG*/
};
int bcm43xx_dma_init(struct bcm43xx_private *bcm);
void bcm43xx_dma_free(struct bcm43xx_private *bcm);
int bcm43xx_dmacontroller_rx_reset(struct bcm43xx_private *bcm,
u16 dmacontroller_mmio_base);
int bcm43xx_dmacontroller_tx_reset(struct bcm43xx_private *bcm,
u16 dmacontroller_mmio_base);
void bcm43xx_dma_handle_xmitstatus(struct bcm43xx_private *bcm,
struct bcm43xx_xmitstatus *status);
int bcm43xx_dma_tx(struct bcm43xx_private *bcm,
struct ieee80211_txb *txb);
void bcm43xx_dma_rx(struct bcm43xx_dmaring *ring);
#else /* CONFIG_BCM43XX_DMA */
static inline
int bcm43xx_dma_init(struct bcm43xx_private *bcm)
{
return 0;
}
static inline
void bcm43xx_dma_free(struct bcm43xx_private *bcm)
{
}
static inline
int bcm43xx_dmacontroller_rx_reset(struct bcm43xx_private *bcm,
u16 dmacontroller_mmio_base)
{
return 0;
}
static inline
int bcm43xx_dmacontroller_tx_reset(struct bcm43xx_private *bcm,
u16 dmacontroller_mmio_base)
{
return 0;
}
static inline
int bcm43xx_dma_tx(struct bcm43xx_private *bcm,
struct ieee80211_txb *txb)
{
return 0;
}
static inline
void bcm43xx_dma_handle_xmitstatus(struct bcm43xx_private *bcm,
struct bcm43xx_xmitstatus *status)
{
}
static inline
void bcm43xx_dma_rx(struct bcm43xx_dmaring *ring)
{
}
#endif /* CONFIG_BCM43XX_DMA */
#endif /* BCM43xx_DMA_H_ */
|
