drivers/net/myri_sbus.h

   1 /* myri_sbus.h: Defines for MyriCOM MyriNET SBUS card driver.
   2  *
   3  * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
   4  */
   5
   6 #ifndef _MYRI_SBUS_H
   7 #define _MYRI_SBUS_H
   8
   9 /* LANAI Registers */
  10 #define LANAI_IPF0      0x00UL          /* Context zero state registers.*/
  11 #define LANAI_CUR0      0x04UL
  12 #define LANAI_PREV0     0x08UL
  13 #define LANAI_DATA0     0x0cUL
  14 #define LANAI_DPF0      0x10UL
  15 #define LANAI_IPF1      0x14UL          /* Context one state registers. */
  16 #define LANAI_CUR1      0x18UL
  17 #define LANAI_PREV1     0x1cUL
  18 #define LANAI_DATA1     0x20UL
  19 #define LANAI_DPF1      0x24UL
  20 #define LANAI_ISTAT     0x28UL          /* Interrupt status.            */
  21 #define LANAI_EIMASK    0x2cUL          /* External IRQ mask.           */
  22 #define LANAI_ITIMER    0x30UL          /* IRQ timer.                   */
  23 #define LANAI_RTC       0x34UL          /* Real Time Clock              */
  24 #define LANAI_CSUM      0x38UL          /* Checksum.                    */
  25 #define LANAI_DMAXADDR  0x3cUL          /* SBUS DMA external address.   */
  26 #define LANAI_DMALADDR  0x40UL          /* SBUS DMA local address.      */
  27 #define LANAI_DMACTR    0x44UL          /* SBUS DMA counter.            */
  28 #define LANAI_RXDMAPTR  0x48UL          /* Receive DMA pointer.         */
  29 #define LANAI_RXDMALIM  0x4cUL          /* Receive DMA limit.           */
  30 #define LANAI_TXDMAPTR  0x50UL          /* Transmit DMA pointer.        */
  31 #define LANAI_TXDMALIM  0x54UL          /* Transmit DMA limit.          */
  32 #define LANAI_TXDMALIMT 0x58UL          /* Transmit DMA limit w/tail.   */
  33         /* 0x5cUL, reserved */
  34 #define LANAI_RBYTE     0x60UL          /* Receive byte.                */
  35         /* 0x64-->0x6c, reserved */
  36 #define LANAI_RHALF     0x70UL          /* Receive half-word.           */
  37         /* 0x72UL, reserved */
  38 #define LANAI_RWORD     0x74UL          /* Receive word.                */
  39 #define LANAI_SALIGN    0x78UL          /* Send align.                  */
  40 #define LANAI_SBYTE     0x7cUL          /* SingleSend send-byte.        */
  41 #define LANAI_SHALF     0x80UL          /* SingleSend send-halfword.    */
  42 #define LANAI_SWORD     0x84UL          /* SingleSend send-word.        */
  43 #define LANAI_SSENDT    0x88UL          /* SingleSend special.          */
  44 #define LANAI_DMADIR    0x8cUL          /* DMA direction.               */
  45 #define LANAI_DMASTAT   0x90UL          /* DMA status.                  */
  46 #define LANAI_TIMEO     0x94UL          /* Timeout register.            */
  47 #define LANAI_MYRINET   0x98UL          /* XXX MAGIC myricom thing      */
  48 #define LANAI_HWDEBUG   0x9cUL          /* Hardware debugging reg.      */
  49 #define LANAI_LEDS      0xa0UL          /* LED control.                 */
  50 #define LANAI_VERS      0xa4UL          /* Version register.            */
  51 #define LANAI_LINKON    0xa8UL          /* Link activation reg.         */
  52         /* 0xac-->0x104, reserved */
  53 #define LANAI_CVAL      0x108UL         /* Clock value register.        */
  54 #define LANAI_REG_SIZE  0x10cUL
  55
  56 /* Interrupt status bits. */
  57 #define ISTAT_DEBUG     0x80000000
  58 #define ISTAT_HOST      0x40000000
  59 #define ISTAT_LAN7      0x00800000
  60 #define ISTAT_LAN6      0x00400000
  61 #define ISTAT_LAN5      0x00200000
  62 #define ISTAT_LAN4      0x00100000
  63 #define ISTAT_LAN3      0x00080000
  64 #define ISTAT_LAN2      0x00040000
  65 #define ISTAT_LAN1      0x00020000
  66 #define ISTAT_LAN0      0x00010000
  67 #define ISTAT_WRDY      0x00008000
  68 #define ISTAT_HRDY      0x00004000
  69 #define ISTAT_SRDY      0x00002000
  70 #define ISTAT_LINK      0x00001000
  71 #define ISTAT_FRES      0x00000800
  72 #define ISTAT_NRES      0x00000800
  73 #define ISTAT_WAKE      0x00000400
  74 #define ISTAT_OB2       0x00000200
  75 #define ISTAT_OB1       0x00000100
  76 #define ISTAT_TAIL      0x00000080
  77 #define ISTAT_WDOG      0x00000040
  78 #define ISTAT_TIME      0x00000020
  79 #define ISTAT_DMA       0x00000010
  80 #define ISTAT_SEND      0x00000008
  81 #define ISTAT_BUF       0x00000004
  82 #define ISTAT_RECV      0x00000002
  83 #define ISTAT_BRDY      0x00000001
  84
  85 /* MYRI Registers */
  86 #define MYRI_RESETOFF   0x00UL
  87 #define MYRI_RESETON    0x04UL
  88 #define MYRI_IRQOFF     0x08UL
  89 #define MYRI_IRQON      0x0cUL
  90 #define MYRI_WAKEUPOFF  0x10UL
  91 #define MYRI_WAKEUPON   0x14UL
  92 #define MYRI_IRQREAD    0x18UL
  93         /* 0x1c-->0x3ffc, reserved */
  94 #define MYRI_LOCALMEM   0x4000UL
  95 #define MYRI_REG_SIZE   0x25000UL
  96
  97 /* Shared memory interrupt mask. */
  98 #define SHMEM_IMASK_RX          0x00000002
  99 #define SHMEM_IMASK_TX          0x00000001
 100
 101 /* Just to make things readable. */
 102 #define KERNEL_CHANNEL          0
 103
 104 /* The size of this must be >= 129 bytes. */
 105 struct myri_eeprom {
 106         unsigned int            cval;
 107         unsigned short          cpuvers;
 108         unsigned char           id[6];
 109         unsigned int            ramsz;
 110         unsigned char           fvers[32];
 111         unsigned char           mvers[16];
 112         unsigned short          dlval;
 113         unsigned short          brd_type;
 114         unsigned short          bus_type;
 115         unsigned short          prod_code;
 116         unsigned int            serial_num;
 117         unsigned short          _reserved[24];
 118         unsigned int            _unused[2];
 119 };
 120
 121 /* EEPROM bus types, only SBUS is valid in this driver. */
 122 #define BUS_TYPE_SBUS           1
 123
 124 /* EEPROM CPU revisions. */
 125 #define CPUVERS_2_3             0x0203
 126 #define CPUVERS_3_0             0x0300
 127 #define CPUVERS_3_1             0x0301
 128 #define CPUVERS_3_2             0x0302
 129 #define CPUVERS_4_0             0x0400
 130 #define CPUVERS_4_1             0x0401
 131 #define CPUVERS_4_2             0x0402
 132 #define CPUVERS_5_0             0x0500
 133
 134 /* MYRI Control Registers */
 135 #define MYRICTRL_CTRL           0x00UL
 136 #define MYRICTRL_IRQLVL         0x02UL
 137 #define MYRICTRL_REG_SIZE       0x04UL
 138
 139 /* Global control register defines. */
 140 #define CONTROL_ROFF            0x8000  /* Reset OFF.           */
 141 #define CONTROL_RON             0x4000  /* Reset ON.            */
 142 #define CONTROL_EIRQ            0x2000  /* Enable IRQ's.        */
 143 #define CONTROL_DIRQ            0x1000  /* Disable IRQ's.       */
 144 #define CONTROL_WON             0x0800  /* Wake-up ON.          */
 145
 146 #define MYRI_SCATTER_ENTRIES    8
 147 #define MYRI_GATHER_ENTRIES     16
 148
 149 struct myri_sglist {
 150         u32 addr;
 151         u32 len;
 152 };
 153
 154 struct myri_rxd {
 155         struct myri_sglist myri_scatters[MYRI_SCATTER_ENTRIES]; /* DMA scatter list.*/
 156         u32 csum;       /* HW computed checksum.    */
 157         u32 ctx;
 158         u32 num_sg;     /* Total scatter entries.   */
 159 };
 160
 161 struct myri_txd {
 162         struct myri_sglist myri_gathers[MYRI_GATHER_ENTRIES]; /* DMA scatter list.  */
 163         u32 num_sg;     /* Total scatter entries.   */
 164         u16 addr[4];    /* XXX address              */
 165         u32 chan;
 166         u32 len;        /* Total length of packet.  */
 167         u32 csum_off;   /* Where data to csum is.   */
 168         u32 csum_field; /* Where csum goes in pkt.  */
 169 };
 170
 171 #define MYRINET_MTU        8432
 172 #define RX_ALLOC_SIZE      8448
 173 #define MYRI_PAD_LEN       2
 174 #define RX_COPY_THRESHOLD  256
 175
 176 /* These numbers are cast in stone, new firmware is needed if
 177  * you want to change them.
 178  */
 179 #define TX_RING_MAXSIZE    16
 180 #define RX_RING_MAXSIZE    16
 181
 182 #define TX_RING_SIZE       16
 183 #define RX_RING_SIZE       16
 184
 185 /* GRRR... */
 186 static __inline__ int NEXT_RX(int num)
 187 {
 188         /* XXX >=??? */
 189         if(++num > RX_RING_SIZE)
 190                 num = 0;
 191         return num;
 192 }
 193
 194 static __inline__ int PREV_RX(int num)
 195 {
 196         if(--num < 0)
 197                 num = RX_RING_SIZE;
 198         return num;
 199 }
 200
 201 #define NEXT_TX(num)    (((num) + 1) & (TX_RING_SIZE - 1))
 202 #define PREV_TX(num)    (((num) - 1) & (TX_RING_SIZE - 1))
 203
 204 #define TX_BUFFS_AVAIL(head, tail)              \
 205         ((head) <= (tail) ?                     \
 206          (head) + (TX_RING_SIZE - 1) - (tail) : \
 207          (head) - (tail) - 1)
 208
 209 struct sendq {
 210         u32     tail;
 211         u32     head;
 212         u32     hdebug;
 213         u32     mdebug;
 214         struct myri_txd myri_txd[TX_RING_MAXSIZE];
 215 };
 216
 217 struct recvq {
 218         u32     head;
 219         u32     tail;
 220         u32     hdebug;
 221         u32     mdebug;
 222         struct myri_rxd myri_rxd[RX_RING_MAXSIZE + 1];
 223 };
 224
 225 #define MYRI_MLIST_SIZE 8
 226
 227 struct mclist {
 228         u32 maxlen;
 229         u32 len;
 230         u32 cache;
 231         struct pair {
 232                 u8 addr[8];
 233                 u32 val;
 234         } mc_pairs[MYRI_MLIST_SIZE];
 235         u8 bcast_addr[8];
 236 };
 237
 238 struct myri_channel {
 239         u32             state;          /* State of the channel.        */
 240         u32             busy;           /* Channel is busy.             */
 241         struct sendq    sendq;          /* Device tx queue.             */
 242         struct recvq    recvq;          /* Device rx queue.             */
 243         struct recvq    recvqa;         /* Device rx queue acked.       */
 244         u32             rbytes;         /* Receive bytes.               */
 245         u32             sbytes;         /* Send bytes.                  */
 246         u32             rmsgs;          /* Receive messages.            */
 247         u32             smsgs;          /* Send messages.               */
 248         struct mclist   mclist;         /* Device multicast list.       */
 249 };
 250
 251 /* Values for per-channel state. */
 252 #define STATE_WFH       0               /* Waiting for HOST.            */
 253 #define STATE_WFN       1               /* Waiting for NET.             */
 254 #define STATE_READY     2               /* Ready.                       */
 255
 256 struct myri_shmem {
 257         u8      addr[8];                /* Board's address.             */
 258         u32     nchan;                  /* Number of channels.          */
 259         u32     burst;                  /* SBUS dma burst enable.       */
 260         u32     shakedown;              /* DarkkkkStarrr Crashesss...   */
 261         u32     send;                   /* Send wanted.                 */
 262         u32     imask;                  /* Interrupt enable mask.       */
 263         u32     mlevel;                 /* Map level.                   */
 264         u32     debug[4];               /* Misc. debug areas.           */
 265         struct myri_channel channel;    /* Only one channel on a host.  */
 266 };
 267
 268 struct myri_eth {
 269         /* These are frequently accessed, keep together
 270          * to obtain good cache hit rates.
 271          */
 272         spinlock_t                      irq_lock;
 273         struct myri_shmem __iomem       *shmem;         /* Shared data structures.    */
 274         void __iomem                    *cregs;         /* Control register space.    */
 275         struct recvq __iomem            *rqack;         /* Where we ack rx's.         */
 276         struct recvq __iomem            *rq;            /* Where we put buffers.      */
 277         struct sendq __iomem            *sq;            /* Where we stuff tx's.       */
 278         struct net_device               *dev;           /* Linux/NET dev struct.      */
 279         int                             tx_old;         /* To speed up tx cleaning.   */
 280         void __iomem                    *lregs;         /* Quick ptr to LANAI regs.   */
 281         struct sk_buff         *rx_skbs[RX_RING_SIZE+1];/* RX skb's                   */
 282         struct sk_buff         *tx_skbs[TX_RING_SIZE];  /* TX skb's                   */
 283
 284         /* These are less frequently accessed. */
 285         void __iomem                    *regs;          /* MyriCOM register space.    */
 286         void __iomem                    *lanai;         /* View 2 of register space.  */
 287         unsigned int                    myri_bursts;    /* SBUS bursts.               */
 288         struct myri_eeprom              eeprom;         /* Local copy of EEPROM.      */
 289         unsigned int                    reg_size;       /* Size of register space.    */
 290         unsigned int                    shmem_base;     /* Offset to shared ram.      */
 291         struct of_device                *myri_op;       /* Our OF device struct.    */
 292 };
 293
 294 /* We use this to acquire receive skb's that we can DMA directly into. */
 295 #define ALIGNED_RX_SKB_ADDR(addr) \
 296         ((((unsigned long)(addr) + (64 - 1)) & ~(64 - 1)) - (unsigned long)(addr))
 297 static inline struct sk_buff *myri_alloc_skb(unsigned int length, gfp_t gfp_flags)
 298 {
 299         struct sk_buff *skb;
 300
 301         skb = alloc_skb(length + 64, gfp_flags);
 302         if(skb) {
 303                 int offset = ALIGNED_RX_SKB_ADDR(skb->data);
 304
 305                 if(offset)
 306                         skb_reserve(skb, offset);
 307         }
 308         return skb;
 309 }
 310
 311 #endif /* !(_MYRI_SBUS_H) */