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         struct ieee80211_tx_status txstat;
 199 };
 200
 201 struct b43legacy_dmaring;
 202
 203 /* Lowlevel DMA operations that differ between 32bit and 64bit DMA. */
 204 struct b43legacy_dma_ops {
 205         struct b43legacy_dmadesc_generic * (*idx2desc)
 206                                            (struct b43legacy_dmaring *ring,
 207                                            int slot,
 208                                            struct b43legacy_dmadesc_meta
 209                                            **meta);
 210         void (*fill_descriptor)(struct b43legacy_dmaring *ring,
 211                                 struct b43legacy_dmadesc_generic *desc,
 212                                 dma_addr_t dmaaddr, u16 bufsize,
 213                                 int start, int end, int irq);
 214         void (*poke_tx)(struct b43legacy_dmaring *ring, int slot);
 215         void (*tx_suspend)(struct b43legacy_dmaring *ring);
 216         void (*tx_resume)(struct b43legacy_dmaring *ring);
 217         int (*get_current_rxslot)(struct b43legacy_dmaring *ring);
 218         void (*set_current_rxslot)(struct b43legacy_dmaring *ring, int slot);
 219 };
 220
 221 struct b43legacy_dmaring {
 222         /* Lowlevel DMA ops. */
 223         const struct b43legacy_dma_ops *ops;
 224         /* Kernel virtual base address of the ring memory. */
 225         void *descbase;
 226         /* Meta data about all descriptors. */
 227         struct b43legacy_dmadesc_meta *meta;
 228         /* Cache of TX headers for each slot.
 229          * This is to avoid an allocation on each TX.
 230          * This is NULL for an RX ring.
 231          */
 232         u8 *txhdr_cache;
 233         /* (Unadjusted) DMA base bus-address of the ring memory. */
 234         dma_addr_t dmabase;
 235         /* Number of descriptor slots in the ring. */
 236         int nr_slots;
 237         /* Number of used descriptor slots. */
 238         int used_slots;
 239         /* Currently used slot in the ring. */
 240         int current_slot;
 241         /* Total number of packets sent. Statistics only. */
 242         unsigned int nr_tx_packets;
 243         /* Frameoffset in octets. */
 244         u32 frameoffset;
 245         /* Descriptor buffer size. */
 246         u16 rx_buffersize;
 247         /* The MMIO base register of the DMA controller. */
 248         u16 mmio_base;
 249         /* DMA controller index number (0-5). */
 250         int index;
 251         /* Boolean. Is this a TX ring? */
 252         bool tx;
 253         /* Boolean. 64bit DMA if true, 32bit DMA otherwise. */
 254         bool dma64;
 255         /* Boolean. Is this ring stopped at ieee80211 level? */
 256         bool stopped;
 257         /* Lock, only used for TX. */
 258         spinlock_t lock;
 259         struct b43legacy_wldev *dev;
 260 #ifdef CONFIG_B43LEGACY_DEBUG
 261         /* Maximum number of used slots. */
 262         int max_used_slots;
 263         /* Last time we injected a ring overflow. */
 264         unsigned long last_injected_overflow;
 265 #endif /* CONFIG_B43LEGACY_DEBUG*/
 266 };
 267
 268
 269 static inline
 270 u32 b43legacy_dma_read(struct b43legacy_dmaring *ring,
 271                        u16 offset)
 272 {
 273         return b43legacy_read32(ring->dev, ring->mmio_base + offset);
 274 }
 275
 276 static inline
 277 void b43legacy_dma_write(struct b43legacy_dmaring *ring,
 278                          u16 offset, u32 value)
 279 {
 280         b43legacy_write32(ring->dev, ring->mmio_base + offset, value);
 281 }
 282
 283
 284 int b43legacy_dma_init(struct b43legacy_wldev *dev);
 285 void b43legacy_dma_free(struct b43legacy_wldev *dev);
 286
 287 int b43legacy_dmacontroller_rx_reset(struct b43legacy_wldev *dev,
 288                                      u16 dmacontroller_mmio_base,
 289                                      int dma64);
 290 int b43legacy_dmacontroller_tx_reset(struct b43legacy_wldev *dev,
 291                                      u16 dmacontroller_mmio_base,
 292                                      int dma64);
 293
 294 u16 b43legacy_dmacontroller_base(int dma64bit, int dmacontroller_idx);
 295
 296 void b43legacy_dma_tx_suspend(struct b43legacy_wldev *dev);
 297 void b43legacy_dma_tx_resume(struct b43legacy_wldev *dev);
 298
 299 void b43legacy_dma_get_tx_stats(struct b43legacy_wldev *dev,
 300                                 struct ieee80211_tx_queue_stats *stats);
 301
 302 int b43legacy_dma_tx(struct b43legacy_wldev *dev,
 303                      struct sk_buff *skb,
 304                      struct ieee80211_tx_control *ctl);
 305 void b43legacy_dma_handle_txstatus(struct b43legacy_wldev *dev,
 306                                    const struct b43legacy_txstatus *status);
 307
 308 void b43legacy_dma_rx(struct b43legacy_dmaring *ring);
 309
 310 #else /* CONFIG_B43LEGACY_DMA */
 311
 312
 313 static inline
 314 int b43legacy_dma_init(struct b43legacy_wldev *dev)
 315 {
 316         return 0;
 317 }
 318 static inline
 319 void b43legacy_dma_free(struct b43legacy_wldev *dev)
 320 {
 321 }
 322 static inline
 323 int b43legacy_dmacontroller_rx_reset(struct b43legacy_wldev *dev,
 324                                      u16 dmacontroller_mmio_base,
 325                                      int dma64)
 326 {
 327         return 0;
 328 }
 329 static inline
 330 int b43legacy_dmacontroller_tx_reset(struct b43legacy_wldev *dev,
 331                                      u16 dmacontroller_mmio_base,
 332                                      int dma64)
 333 {
 334         return 0;
 335 }
 336 static inline
 337 void b43legacy_dma_get_tx_stats(struct b43legacy_wldev *dev,
 338                                 struct ieee80211_tx_queue_stats *stats)
 339 {
 340 }
 341 static inline
 342 int b43legacy_dma_tx(struct b43legacy_wldev *dev,
 343                      struct sk_buff *skb,
 344                      struct ieee80211_tx_control *ctl)
 345 {
 346         return 0;
 347 }
 348 static inline
 349 void b43legacy_dma_handle_txstatus(struct b43legacy_wldev *dev,
 350                                    const struct b43legacy_txstatus *status)
 351 {
 352 }
 353 static inline
 354 void b43legacy_dma_rx(struct b43legacy_dmaring *ring)
 355 {
 356 }
 357 static inline
 358 void b43legacy_dma_tx_suspend(struct b43legacy_wldev *dev)
 359 {
 360 }
 361 static inline
 362 void b43legacy_dma_tx_resume(struct b43legacy_wldev *dev)
 363 {
 364 }
 365
 366 #endif /* CONFIG_B43LEGACY_DMA */
 367 #endif /* B43legacy_DMA_H_ */