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>
11 /* DMA-Interrupt reasons. */
12 /*TODO: add the missing ones. */
13 #define BCM43xx_DMAIRQ_ERR0 (1 << 10)
14 #define BCM43xx_DMAIRQ_ERR1 (1 << 11)
15 #define BCM43xx_DMAIRQ_ERR2 (1 << 12)
16 #define BCM43xx_DMAIRQ_ERR3 (1 << 13)
17 #define BCM43xx_DMAIRQ_ERR4 (1 << 14)
18 #define BCM43xx_DMAIRQ_ERR5 (1 << 15)
19 #define BCM43xx_DMAIRQ_RX_DONE (1 << 16)
21 #define BCM43xx_DMAIRQ_ANYERR (BCM43xx_DMAIRQ_ERR0 | \
22 BCM43xx_DMAIRQ_ERR1 | \
23 BCM43xx_DMAIRQ_ERR2 | \
24 BCM43xx_DMAIRQ_ERR3 | \
25 BCM43xx_DMAIRQ_ERR4 | \
27 #define BCM43xx_DMAIRQ_FATALERR (BCM43xx_DMAIRQ_ERR0 | \
28 BCM43xx_DMAIRQ_ERR1 | \
29 BCM43xx_DMAIRQ_ERR2 | \
30 BCM43xx_DMAIRQ_ERR4 | \
32 #define BCM43xx_DMAIRQ_NONFATALERR BCM43xx_DMAIRQ_ERR3
34 /* DMA controller register offsets. (relative to BCM43xx_DMA#_BASE) */
35 #define BCM43xx_DMA_TX_CONTROL 0x00
36 #define BCM43xx_DMA_TX_DESC_RING 0x04
37 #define BCM43xx_DMA_TX_DESC_INDEX 0x08
38 #define BCM43xx_DMA_TX_STATUS 0x0c
39 #define BCM43xx_DMA_RX_CONTROL 0x10
40 #define BCM43xx_DMA_RX_DESC_RING 0x14
41 #define BCM43xx_DMA_RX_DESC_INDEX 0x18
42 #define BCM43xx_DMA_RX_STATUS 0x1c
44 /* DMA controller channel control word values. */
45 #define BCM43xx_DMA_TXCTRL_ENABLE (1 << 0)
46 #define BCM43xx_DMA_TXCTRL_SUSPEND (1 << 1)
47 #define BCM43xx_DMA_TXCTRL_LOOPBACK (1 << 2)
48 #define BCM43xx_DMA_TXCTRL_FLUSH (1 << 4)
49 #define BCM43xx_DMA_RXCTRL_ENABLE (1 << 0)
50 #define BCM43xx_DMA_RXCTRL_FRAMEOFF_MASK 0x000000fe
51 #define BCM43xx_DMA_RXCTRL_FRAMEOFF_SHIFT 1
52 #define BCM43xx_DMA_RXCTRL_PIO (1 << 8)
53 /* DMA controller channel status word values. */
54 #define BCM43xx_DMA_TXSTAT_DPTR_MASK 0x00000fff
55 #define BCM43xx_DMA_TXSTAT_STAT_MASK 0x0000f000
56 #define BCM43xx_DMA_TXSTAT_STAT_DISABLED 0x00000000
57 #define BCM43xx_DMA_TXSTAT_STAT_ACTIVE 0x00001000
58 #define BCM43xx_DMA_TXSTAT_STAT_IDLEWAIT 0x00002000
59 #define BCM43xx_DMA_TXSTAT_STAT_STOPPED 0x00003000
60 #define BCM43xx_DMA_TXSTAT_STAT_SUSP 0x00004000
61 #define BCM43xx_DMA_TXSTAT_ERROR_MASK 0x000f0000
62 #define BCM43xx_DMA_TXSTAT_FLUSHED (1 << 20)
63 #define BCM43xx_DMA_RXSTAT_DPTR_MASK 0x00000fff
64 #define BCM43xx_DMA_RXSTAT_STAT_MASK 0x0000f000
65 #define BCM43xx_DMA_RXSTAT_STAT_DISABLED 0x00000000
66 #define BCM43xx_DMA_RXSTAT_STAT_ACTIVE 0x00001000
67 #define BCM43xx_DMA_RXSTAT_STAT_IDLEWAIT 0x00002000
68 #define BCM43xx_DMA_RXSTAT_STAT_RESERVED 0x00003000
69 #define BCM43xx_DMA_RXSTAT_STAT_ERRORS 0x00004000
70 #define BCM43xx_DMA_RXSTAT_ERROR_MASK 0x000f0000
72 /* DMA descriptor control field values. */
73 #define BCM43xx_DMADTOR_BYTECNT_MASK 0x00001fff
74 #define BCM43xx_DMADTOR_DTABLEEND (1 << 28) /* End of descriptor table */
75 #define BCM43xx_DMADTOR_COMPIRQ (1 << 29) /* IRQ on completion request */
76 #define BCM43xx_DMADTOR_FRAMEEND (1 << 30)
77 #define BCM43xx_DMADTOR_FRAMESTART (1 << 31)
79 /* Misc DMA constants */
80 #define BCM43xx_DMA_RINGMEMSIZE PAGE_SIZE
81 #define BCM43xx_DMA_BUSADDRMAX 0x3FFFFFFF
82 #define BCM43xx_DMA_DMABUSADDROFFSET (1 << 30)
83 #define BCM43xx_DMA1_RX_FRAMEOFFSET 30
84 #define BCM43xx_DMA4_RX_FRAMEOFFSET 0
86 /* DMA engine tuning knobs */
87 #define BCM43xx_TXRING_SLOTS 512
88 #define BCM43xx_RXRING_SLOTS 64
89 #define BCM43xx_DMA1_RXBUFFERSIZE (2304 + 100)
90 #define BCM43xx_DMA4_RXBUFFERSIZE 16
91 /* Suspend the tx queue, if less than this percent slots are free. */
92 #define BCM43xx_TXSUSPEND_PERCENT 20
93 /* Resume the tx queue, if more than this percent slots are free. */
94 #define BCM43xx_TXRESUME_PERCENT 50
98 #ifdef CONFIG_BCM43XX_DMA
102 struct bcm43xx_private;
103 struct bcm43xx_xmitstatus;
106 struct bcm43xx_dmadesc {
109 } __attribute__((__packed__));
111 /* Macros to access the bcm43xx_dmadesc struct */
112 #define get_desc_ctl(desc) le32_to_cpu((desc)->_control)
113 #define set_desc_ctl(desc, ctl) do { (desc)->_control = cpu_to_le32(ctl); } while (0)
114 #define get_desc_addr(desc) le32_to_cpu((desc)->_address)
115 #define set_desc_addr(desc, addr) do { (desc)->_address = cpu_to_le32(addr); } while (0)
117 struct bcm43xx_dmadesc_meta {
118 /* The kernel DMA-able buffer. */
120 /* DMA base bus-address of the descriptor buffer. */
124 struct bcm43xx_dmaring {
125 struct bcm43xx_private *bcm;
126 /* Kernel virtual base address of the ring memory. */
127 struct bcm43xx_dmadesc *vbase;
128 /* DMA memory offset */
129 dma_addr_t memoffset;
130 /* (Unadjusted) DMA base bus-address of the ring memory. */
132 /* Meta data about all descriptors. */
133 struct bcm43xx_dmadesc_meta *meta;
134 /* Number of descriptor slots in the ring. */
136 /* Number of used descriptor slots. */
138 /* Currently used slot in the ring. */
140 /* Marks to suspend/resume the queue. */
143 /* Frameoffset in octets. */
145 /* Descriptor buffer size. */
147 /* The MMIO base register of the DMA controller, this
151 u8 tx:1, /* TRUE, if this is a TX ring. */
152 suspended:1; /* TRUE, if transfers are suspended on this ring. */
153 #ifdef CONFIG_BCM43XX_DEBUG
154 /* Maximum number of used slots. */
156 #endif /* CONFIG_BCM43XX_DEBUG*/
160 int bcm43xx_dma_init(struct bcm43xx_private *bcm);
161 void bcm43xx_dma_free(struct bcm43xx_private *bcm);
163 int bcm43xx_dmacontroller_rx_reset(struct bcm43xx_private *bcm,
164 u16 dmacontroller_mmio_base);
165 int bcm43xx_dmacontroller_tx_reset(struct bcm43xx_private *bcm,
166 u16 dmacontroller_mmio_base);
168 void bcm43xx_dma_handle_xmitstatus(struct bcm43xx_private *bcm,
169 struct bcm43xx_xmitstatus *status);
171 int bcm43xx_dma_tx(struct bcm43xx_private *bcm,
172 struct ieee80211_txb *txb);
173 void bcm43xx_dma_rx(struct bcm43xx_dmaring *ring);
176 #else /* CONFIG_BCM43XX_DMA */
180 int bcm43xx_dma_init(struct bcm43xx_private *bcm)
185 void bcm43xx_dma_free(struct bcm43xx_private *bcm)
189 int bcm43xx_dmacontroller_rx_reset(struct bcm43xx_private *bcm,
190 u16 dmacontroller_mmio_base)
195 int bcm43xx_dmacontroller_tx_reset(struct bcm43xx_private *bcm,
196 u16 dmacontroller_mmio_base)
201 int bcm43xx_dma_tx(struct bcm43xx_private *bcm,
202 struct ieee80211_txb *txb)
207 void bcm43xx_dma_handle_xmitstatus(struct bcm43xx_private *bcm,
208 struct bcm43xx_xmitstatus *status)
212 void bcm43xx_dma_rx(struct bcm43xx_dmaring *ring)
216 #endif /* CONFIG_BCM43XX_DMA */
217 #endif /* BCM43xx_DMA_H_ */