drivers/net/wireless/b43legacy/dma.h

   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 } __attribute__((__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 } __attribute__((__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         } __attribute__((__packed__));
 166 } __attribute__((__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
 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
 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
 304 int b43legacy_dma_init(struct b43legacy_wldev *dev)
 305 {
 306         return 0;
 307 }
 308 static inline
 309 void b43legacy_dma_free(struct b43legacy_wldev *dev)
 310 {
 311 }
 312 static inline
 313 int b43legacy_dma_tx(struct b43legacy_wldev *dev,
 314                      struct sk_buff *skb)
 315 {
 316         return 0;
 317 }
 318 static inline
 319 void b43legacy_dma_handle_txstatus(struct b43legacy_wldev *dev,
 320                                    const struct b43legacy_txstatus *status)
 321 {
 322 }
 323 static inline
 324 void b43legacy_dma_rx(struct b43legacy_dmaring *ring)
 325 {
 326 }
 327 static inline
 328 void b43legacy_dma_tx_suspend(struct b43legacy_wldev *dev)
 329 {
 330 }
 331 static inline
 332 void b43legacy_dma_tx_resume(struct b43legacy_wldev *dev)
 333 {
 334 }
 335
 336 #endif /* CONFIG_B43LEGACY_DMA */
 337 #endif /* B43legacy_DMA_H_ */