git.oblomov.eu Git - linux-2.6/blob - drivers/net/sb1250-mac.c

   1 /*
   2  * Copyright (C) 2001,2002,2003,2004 Broadcom Corporation
   3  * Copyright (c) 2006, 2007  Maciej W. Rozycki
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  18  *
  19  *
  20  * This driver is designed for the Broadcom SiByte SOC built-in
  21  * Ethernet controllers. Written by Mitch Lichtenberg at Broadcom Corp.
  22  *
  23  * Updated to the driver model and the PHY abstraction layer
  24  * by Maciej W. Rozycki.
  25  */
  26
  27 #include <linux/bug.h>
  28 #include <linux/module.h>
  29 #include <linux/kernel.h>
  30 #include <linux/string.h>
  31 #include <linux/timer.h>
  32 #include <linux/errno.h>
  33 #include <linux/ioport.h>
  34 #include <linux/slab.h>
  35 #include <linux/interrupt.h>
  36 #include <linux/netdevice.h>
  37 #include <linux/etherdevice.h>
  38 #include <linux/skbuff.h>
  39 #include <linux/init.h>
  40 #include <linux/bitops.h>
  41 #include <linux/err.h>
  42 #include <linux/ethtool.h>
  43 #include <linux/mii.h>
  44 #include <linux/phy.h>
  45 #include <linux/platform_device.h>
  46
  47 #include <asm/cache.h>
  48 #include <asm/io.h>
  49 #include <asm/processor.h>      /* Processor type for cache alignment. */
  50
  51 /* This is only here until the firmware is ready.  In that case,
  52    the firmware leaves the ethernet address in the register for us. */
  53 #ifdef CONFIG_SIBYTE_STANDALONE
  54 #define SBMAC_ETH0_HWADDR "40:00:00:00:01:00"
  55 #define SBMAC_ETH1_HWADDR "40:00:00:00:01:01"
  56 #define SBMAC_ETH2_HWADDR "40:00:00:00:01:02"
  57 #define SBMAC_ETH3_HWADDR "40:00:00:00:01:03"
  58 #endif
  59
  60
  61 /* These identify the driver base version and may not be removed. */
  62 #if 0
  63 static char version1[] __initdata =
  64 "sb1250-mac.c:1.00 1/11/2001 Written by Mitch Lichtenberg\n";
  65 #endif
  66
  67
  68 /* Operational parameters that usually are not changed. */
  69
  70 #define CONFIG_SBMAC_COALESCE
  71
  72 /* Time in jiffies before concluding the transmitter is hung. */
  73 #define TX_TIMEOUT  (2*HZ)
  74
  75
  76 MODULE_AUTHOR("Mitch Lichtenberg (Broadcom Corp.)");
  77 MODULE_DESCRIPTION("Broadcom SiByte SOC GB Ethernet driver");
  78
  79 /* A few user-configurable values which may be modified when a driver
  80    module is loaded. */
  81
  82 /* 1 normal messages, 0 quiet .. 7 verbose. */
  83 static int debug = 1;
  84 module_param(debug, int, S_IRUGO);
  85 MODULE_PARM_DESC(debug, "Debug messages");
  86
  87 #ifdef CONFIG_SBMAC_COALESCE
  88 static int int_pktcnt_tx = 255;
  89 module_param(int_pktcnt_tx, int, S_IRUGO);
  90 MODULE_PARM_DESC(int_pktcnt_tx, "TX packet count");
  91
  92 static int int_timeout_tx = 255;
  93 module_param(int_timeout_tx, int, S_IRUGO);
  94 MODULE_PARM_DESC(int_timeout_tx, "TX timeout value");
  95
  96 static int int_pktcnt_rx = 64;
  97 module_param(int_pktcnt_rx, int, S_IRUGO);
  98 MODULE_PARM_DESC(int_pktcnt_rx, "RX packet count");
  99
 100 static int int_timeout_rx = 64;
 101 module_param(int_timeout_rx, int, S_IRUGO);
 102 MODULE_PARM_DESC(int_timeout_rx, "RX timeout value");
 103 #endif
 104
 105 #include <asm/sibyte/board.h>
 106 #include <asm/sibyte/sb1250.h>
 107 #if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80)
 108 #include <asm/sibyte/bcm1480_regs.h>
 109 #include <asm/sibyte/bcm1480_int.h>
 110 #define R_MAC_DMA_OODPKTLOST_RX R_MAC_DMA_OODPKTLOST
 111 #elif defined(CONFIG_SIBYTE_SB1250) || defined(CONFIG_SIBYTE_BCM112X)
 112 #include <asm/sibyte/sb1250_regs.h>
 113 #include <asm/sibyte/sb1250_int.h>
 114 #else
 115 #error invalid SiByte MAC configuation
 116 #endif
 117 #include <asm/sibyte/sb1250_scd.h>
 118 #include <asm/sibyte/sb1250_mac.h>
 119 #include <asm/sibyte/sb1250_dma.h>
 120
 121 #if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80)
 122 #define UNIT_INT(n)             (K_BCM1480_INT_MAC_0 + ((n) * 2))
 123 #elif defined(CONFIG_SIBYTE_SB1250) || defined(CONFIG_SIBYTE_BCM112X)
 124 #define UNIT_INT(n)             (K_INT_MAC_0 + (n))
 125 #else
 126 #error invalid SiByte MAC configuation
 127 #endif
 128
 129 #ifdef K_INT_PHY
 130 #define SBMAC_PHY_INT                   K_INT_PHY
 131 #else
 132 #define SBMAC_PHY_INT                   PHY_POLL
 133 #endif
 134
 135 /**********************************************************************
 136  *  Simple types
 137  ********************************************************************* */
 138
 139 enum sbmac_speed {
 140         sbmac_speed_none = 0,
 141         sbmac_speed_10 = SPEED_10,
 142         sbmac_speed_100 = SPEED_100,
 143         sbmac_speed_1000 = SPEED_1000,
 144 };
 145
 146 enum sbmac_duplex {
 147         sbmac_duplex_none = -1,
 148         sbmac_duplex_half = DUPLEX_HALF,
 149         sbmac_duplex_full = DUPLEX_FULL,
 150 };
 151
 152 enum sbmac_fc {
 153         sbmac_fc_none,
 154         sbmac_fc_disabled,
 155         sbmac_fc_frame,
 156         sbmac_fc_collision,
 157         sbmac_fc_carrier,
 158 };
 159
 160 enum sbmac_state {
 161         sbmac_state_uninit,
 162         sbmac_state_off,
 163         sbmac_state_on,
 164         sbmac_state_broken,
 165 };
 166
 167
 168 /**********************************************************************
 169  *  Macros
 170  ********************************************************************* */
 171
 172
 173 #define SBDMA_NEXTBUF(d,f) ((((d)->f+1) == (d)->sbdma_dscrtable_end) ? \
 174                           (d)->sbdma_dscrtable : (d)->f+1)
 175
 176
 177 #define NUMCACHEBLKS(x) (((x)+SMP_CACHE_BYTES-1)/SMP_CACHE_BYTES)
 178
 179 #define SBMAC_MAX_TXDESCR       256
 180 #define SBMAC_MAX_RXDESCR       256
 181
 182 #define ETHER_ADDR_LEN          6
 183 #define ENET_PACKET_SIZE        1518
 184 /*#define ENET_PACKET_SIZE      9216 */
 185
 186 /**********************************************************************
 187  *  DMA Descriptor structure
 188  ********************************************************************* */
 189
 190 struct sbdmadscr {
 191         uint64_t  dscr_a;
 192         uint64_t  dscr_b;
 193 };
 194
 195 /**********************************************************************
 196  *  DMA Controller structure
 197  ********************************************************************* */
 198
 199 struct sbmacdma {
 200
 201         /*
 202          * This stuff is used to identify the channel and the registers
 203          * associated with it.
 204          */
 205         struct sbmac_softc      *sbdma_eth;     /* back pointer to associated
 206                                                    MAC */
 207         int                     sbdma_channel;  /* channel number */
 208         int                     sbdma_txdir;    /* direction (1=transmit) */
 209         int                     sbdma_maxdescr; /* total # of descriptors
 210                                                    in ring */
 211 #ifdef CONFIG_SBMAC_COALESCE
 212         int                     sbdma_int_pktcnt;
 213                                                 /* # descriptors rx/tx
 214                                                    before interrupt */
 215         int                     sbdma_int_timeout;
 216                                                 /* # usec rx/tx interrupt */
 217 #endif
 218         void __iomem            *sbdma_config0; /* DMA config register 0 */
 219         void __iomem            *sbdma_config1; /* DMA config register 1 */
 220         void __iomem            *sbdma_dscrbase;
 221                                                 /* descriptor base address */
 222         void __iomem            *sbdma_dscrcnt; /* descriptor count register */
 223         void __iomem            *sbdma_curdscr; /* current descriptor
 224                                                    address */
 225         void __iomem            *sbdma_oodpktlost;
 226                                                 /* pkt drop (rx only) */
 227
 228         /*
 229          * This stuff is for maintenance of the ring
 230          */
 231         void                    *sbdma_dscrtable_unaligned;
 232         struct sbdmadscr        *sbdma_dscrtable;
 233                                                 /* base of descriptor table */
 234         struct sbdmadscr        *sbdma_dscrtable_end;
 235                                                 /* end of descriptor table */
 236         struct sk_buff          **sbdma_ctxtable;
 237                                                 /* context table, one
 238                                                    per descr */
 239         dma_addr_t              sbdma_dscrtable_phys;
 240                                                 /* and also the phys addr */
 241         struct sbdmadscr        *sbdma_addptr;  /* next dscr for sw to add */
 242         struct sbdmadscr        *sbdma_remptr;  /* next dscr for sw
 243                                                    to remove */
 244 };
 245
 246
 247 /**********************************************************************
 248  *  Ethernet softc structure
 249  ********************************************************************* */
 250
 251 struct sbmac_softc {
 252
 253         /*
 254          * Linux-specific things
 255          */
 256         struct net_device       *sbm_dev;       /* pointer to linux device */
 257         struct napi_struct      napi;
 258         struct phy_device       *phy_dev;       /* the associated PHY device */
 259         struct mii_bus          mii_bus;        /* the MII bus */
 260         int                     phy_irq[PHY_MAX_ADDR];
 261         spinlock_t              sbm_lock;       /* spin lock */
 262         int                     sbm_devflags;   /* current device flags */
 263
 264         /*
 265          * Controller-specific things
 266          */
 267         void __iomem            *sbm_base;      /* MAC's base address */
 268         enum sbmac_state        sbm_state;      /* current state */
 269
 270         void __iomem            *sbm_macenable; /* MAC Enable Register */
 271         void __iomem            *sbm_maccfg;    /* MAC Config Register */
 272         void __iomem            *sbm_fifocfg;   /* FIFO Config Register */
 273         void __iomem            *sbm_framecfg;  /* Frame Config Register */
 274         void __iomem            *sbm_rxfilter;  /* Receive Filter Register */
 275         void __iomem            *sbm_isr;       /* Interrupt Status Register */
 276         void __iomem            *sbm_imr;       /* Interrupt Mask Register */
 277         void __iomem            *sbm_mdio;      /* MDIO Register */
 278
 279         enum sbmac_speed        sbm_speed;      /* current speed */
 280         enum sbmac_duplex       sbm_duplex;     /* current duplex */
 281         enum sbmac_fc           sbm_fc;         /* cur. flow control setting */
 282         int                     sbm_pause;      /* current pause setting */
 283         int                     sbm_link;       /* current link state */
 284
 285         unsigned char           sbm_hwaddr[ETHER_ADDR_LEN];
 286
 287         struct sbmacdma         sbm_txdma;      /* only channel 0 for now */
 288         struct sbmacdma         sbm_rxdma;
 289         int                     rx_hw_checksum;
 290         int                     sbe_idx;
 291 };
 292
 293
 294 /**********************************************************************
 295  *  Externs
 296  ********************************************************************* */
 297
 298 /**********************************************************************
 299  *  Prototypes
 300  ********************************************************************* */
 301
 302 static void sbdma_initctx(struct sbmacdma *d, struct sbmac_softc *s, int chan,
 303                           int txrx, int maxdescr);
 304 static void sbdma_channel_start(struct sbmacdma *d, int rxtx);
 305 static int sbdma_add_rcvbuffer(struct sbmac_softc *sc, struct sbmacdma *d,
 306                                struct sk_buff *m);
 307 static int sbdma_add_txbuffer(struct sbmacdma *d, struct sk_buff *m);
 308 static void sbdma_emptyring(struct sbmacdma *d);
 309 static void sbdma_fillring(struct sbmac_softc *sc, struct sbmacdma *d);
 310 static int sbdma_rx_process(struct sbmac_softc *sc, struct sbmacdma *d,
 311                             int work_to_do, int poll);
 312 static void sbdma_tx_process(struct sbmac_softc *sc, struct sbmacdma *d,
 313                              int poll);
 314 static int sbmac_initctx(struct sbmac_softc *s);
 315 static void sbmac_channel_start(struct sbmac_softc *s);
 316 static void sbmac_channel_stop(struct sbmac_softc *s);
 317 static enum sbmac_state sbmac_set_channel_state(struct sbmac_softc *,
 318                                                 enum sbmac_state);
 319 static void sbmac_promiscuous_mode(struct sbmac_softc *sc, int onoff);
 320 static uint64_t sbmac_addr2reg(unsigned char *ptr);
 321 static irqreturn_t sbmac_intr(int irq, void *dev_instance);
 322 static int sbmac_start_tx(struct sk_buff *skb, struct net_device *dev);
 323 static void sbmac_setmulti(struct sbmac_softc *sc);
 324 static int sbmac_init(struct platform_device *pldev, long long base);
 325 static int sbmac_set_speed(struct sbmac_softc *s, enum sbmac_speed speed);
 326 static int sbmac_set_duplex(struct sbmac_softc *s, enum sbmac_duplex duplex,
 327                             enum sbmac_fc fc);
 328
 329 static int sbmac_open(struct net_device *dev);
 330 static void sbmac_tx_timeout (struct net_device *dev);
 331 static void sbmac_set_rx_mode(struct net_device *dev);
 332 static int sbmac_mii_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 333 static int sbmac_close(struct net_device *dev);
 334 static int sbmac_poll(struct napi_struct *napi, int budget);
 335
 336 static void sbmac_mii_poll(struct net_device *dev);
 337 static int sbmac_mii_probe(struct net_device *dev);
 338
 339 static void sbmac_mii_sync(void __iomem *sbm_mdio);
 340 static void sbmac_mii_senddata(void __iomem *sbm_mdio, unsigned int data,
 341                                int bitcnt);
 342 static int sbmac_mii_read(struct mii_bus *bus, int phyaddr, int regidx);
 343 static int sbmac_mii_write(struct mii_bus *bus, int phyaddr, int regidx,
 344                            u16 val);
 345
 346
 347 /**********************************************************************
 348  *  Globals
 349  ********************************************************************* */
 350
 351 static char sbmac_string[] = "sb1250-mac";
 352 static char sbmac_pretty[] = "SB1250 MAC";
 353
 354 static char sbmac_mdio_string[] = "sb1250-mac-mdio";
 355
 356
 357 /**********************************************************************
 358  *  MDIO constants
 359  ********************************************************************* */
 360
 361 #define MII_COMMAND_START       0x01
 362 #define MII_COMMAND_READ        0x02
 363 #define MII_COMMAND_WRITE       0x01
 364 #define MII_COMMAND_ACK         0x02
 365
 366 #define M_MAC_MDIO_DIR_OUTPUT   0               /* for clarity */
 367
 368 #define ENABLE          1
 369 #define DISABLE         0
 370
 371 /**********************************************************************
 372  *  SBMAC_MII_SYNC(sbm_mdio)
 373  *
 374  *  Synchronize with the MII - send a pattern of bits to the MII
 375  *  that will guarantee that it is ready to accept a command.
 376  *
 377  *  Input parameters:
 378  *         sbm_mdio - address of the MAC's MDIO register
 379  *
 380  *  Return value:
 381  *         nothing
 382  ********************************************************************* */
 383
 384 static void sbmac_mii_sync(void __iomem *sbm_mdio)
 385 {
 386         int cnt;
 387         uint64_t bits;
 388         int mac_mdio_genc;
 389
 390         mac_mdio_genc = __raw_readq(sbm_mdio) & M_MAC_GENC;
 391
 392         bits = M_MAC_MDIO_DIR_OUTPUT | M_MAC_MDIO_OUT;
 393
 394         __raw_writeq(bits | mac_mdio_genc, sbm_mdio);
 395
 396         for (cnt = 0; cnt < 32; cnt++) {
 397                 __raw_writeq(bits | M_MAC_MDC | mac_mdio_genc, sbm_mdio);
 398                 __raw_writeq(bits | mac_mdio_genc, sbm_mdio);
 399         }
 400 }
 401
 402 /**********************************************************************
 403  *  SBMAC_MII_SENDDATA(sbm_mdio, data, bitcnt)
 404  *
 405  *  Send some bits to the MII.  The bits to be sent are right-
 406  *  justified in the 'data' parameter.
 407  *
 408  *  Input parameters:
 409  *         sbm_mdio - address of the MAC's MDIO register
 410  *         data     - data to send
 411  *         bitcnt   - number of bits to send
 412  ********************************************************************* */
 413
 414 static void sbmac_mii_senddata(void __iomem *sbm_mdio, unsigned int data,
 415                                int bitcnt)
 416 {
 417         int i;
 418         uint64_t bits;
 419         unsigned int curmask;
 420         int mac_mdio_genc;
 421
 422         mac_mdio_genc = __raw_readq(sbm_mdio) & M_MAC_GENC;
 423
 424         bits = M_MAC_MDIO_DIR_OUTPUT;
 425         __raw_writeq(bits | mac_mdio_genc, sbm_mdio);
 426
 427         curmask = 1 << (bitcnt - 1);
 428
 429         for (i = 0; i < bitcnt; i++) {
 430                 if (data & curmask)
 431                         bits |= M_MAC_MDIO_OUT;
 432                 else bits &= ~M_MAC_MDIO_OUT;
 433                 __raw_writeq(bits | mac_mdio_genc, sbm_mdio);
 434                 __raw_writeq(bits | M_MAC_MDC | mac_mdio_genc, sbm_mdio);
 435                 __raw_writeq(bits | mac_mdio_genc, sbm_mdio);
 436                 curmask >>= 1;
 437         }
 438 }
 439
 440
 441
 442 /**********************************************************************
 443  *  SBMAC_MII_READ(bus, phyaddr, regidx)
 444  *  Read a PHY register.
 445  *
 446  *  Input parameters:
 447  *         bus     - MDIO bus handle
 448  *         phyaddr - PHY's address
 449  *         regnum  - index of register to read
 450  *
 451  *  Return value:
 452  *         value read, or 0xffff if an error occurred.
 453  ********************************************************************* */
 454
 455 static int sbmac_mii_read(struct mii_bus *bus, int phyaddr, int regidx)
 456 {
 457         struct sbmac_softc *sc = (struct sbmac_softc *)bus->priv;
 458         void __iomem *sbm_mdio = sc->sbm_mdio;
 459         int idx;
 460         int error;
 461         int regval;
 462         int mac_mdio_genc;
 463
 464         /*
 465          * Synchronize ourselves so that the PHY knows the next
 466          * thing coming down is a command
 467          */
 468         sbmac_mii_sync(sbm_mdio);
 469
 470         /*
 471          * Send the data to the PHY.  The sequence is
 472          * a "start" command (2 bits)
 473          * a "read" command (2 bits)
 474          * the PHY addr (5 bits)
 475          * the register index (5 bits)
 476          */
 477         sbmac_mii_senddata(sbm_mdio, MII_COMMAND_START, 2);
 478         sbmac_mii_senddata(sbm_mdio, MII_COMMAND_READ, 2);
 479         sbmac_mii_senddata(sbm_mdio, phyaddr, 5);
 480         sbmac_mii_senddata(sbm_mdio, regidx, 5);
 481
 482         mac_mdio_genc = __raw_readq(sbm_mdio) & M_MAC_GENC;
 483
 484         /*
 485          * Switch the port around without a clock transition.
 486          */
 487         __raw_writeq(M_MAC_MDIO_DIR_INPUT | mac_mdio_genc, sbm_mdio);
 488
 489         /*
 490          * Send out a clock pulse to signal we want the status
 491          */
 492         __raw_writeq(M_MAC_MDIO_DIR_INPUT | M_MAC_MDC | mac_mdio_genc,
 493                      sbm_mdio);
 494         __raw_writeq(M_MAC_MDIO_DIR_INPUT | mac_mdio_genc, sbm_mdio);
 495
 496         /*
 497          * If an error occurred, the PHY will signal '1' back
 498          */
 499         error = __raw_readq(sbm_mdio) & M_MAC_MDIO_IN;
 500
 501         /*
 502          * Issue an 'idle' clock pulse, but keep the direction
 503          * the same.
 504          */
 505         __raw_writeq(M_MAC_MDIO_DIR_INPUT | M_MAC_MDC | mac_mdio_genc,
 506                      sbm_mdio);
 507         __raw_writeq(M_MAC_MDIO_DIR_INPUT | mac_mdio_genc, sbm_mdio);
 508
 509         regval = 0;
 510
 511         for (idx = 0; idx < 16; idx++) {
 512                 regval <<= 1;
 513
 514                 if (error == 0) {
 515                         if (__raw_readq(sbm_mdio) & M_MAC_MDIO_IN)
 516                                 regval |= 1;
 517                 }
 518
 519                 __raw_writeq(M_MAC_MDIO_DIR_INPUT | M_MAC_MDC | mac_mdio_genc,
 520                              sbm_mdio);
 521                 __raw_writeq(M_MAC_MDIO_DIR_INPUT | mac_mdio_genc, sbm_mdio);
 522         }
 523
 524         /* Switch back to output */
 525         __raw_writeq(M_MAC_MDIO_DIR_OUTPUT | mac_mdio_genc, sbm_mdio);
 526
 527         if (error == 0)
 528                 return regval;
 529         return 0xffff;
 530 }
 531
 532
 533 /**********************************************************************
 534  *  SBMAC_MII_WRITE(bus, phyaddr, regidx, regval)
 535  *
 536  *  Write a value to a PHY register.
 537  *
 538  *  Input parameters:
 539  *         bus     - MDIO bus handle
 540  *         phyaddr - PHY to use
 541  *         regidx  - register within the PHY
 542  *         regval  - data to write to register
 543  *
 544  *  Return value:
 545  *         0 for success
 546  ********************************************************************* */
 547
 548 static int sbmac_mii_write(struct mii_bus *bus, int phyaddr, int regidx,
 549                            u16 regval)
 550 {
 551         struct sbmac_softc *sc = (struct sbmac_softc *)bus->priv;
 552         void __iomem *sbm_mdio = sc->sbm_mdio;
 553         int mac_mdio_genc;
 554
 555         sbmac_mii_sync(sbm_mdio);
 556
 557         sbmac_mii_senddata(sbm_mdio, MII_COMMAND_START, 2);
 558         sbmac_mii_senddata(sbm_mdio, MII_COMMAND_WRITE, 2);
 559         sbmac_mii_senddata(sbm_mdio, phyaddr, 5);
 560         sbmac_mii_senddata(sbm_mdio, regidx, 5);
 561         sbmac_mii_senddata(sbm_mdio, MII_COMMAND_ACK, 2);
 562         sbmac_mii_senddata(sbm_mdio, regval, 16);
 563
 564         mac_mdio_genc = __raw_readq(sbm_mdio) & M_MAC_GENC;
 565
 566         __raw_writeq(M_MAC_MDIO_DIR_OUTPUT | mac_mdio_genc, sbm_mdio);
 567
 568         return 0;
 569 }
 570
 571
 572
 573 /**********************************************************************
 574  *  SBDMA_INITCTX(d,s,chan,txrx,maxdescr)
 575  *
 576  *  Initialize a DMA channel context.  Since there are potentially
 577  *  eight DMA channels per MAC, it's nice to do this in a standard
 578  *  way.
 579  *
 580  *  Input parameters:
 581  *         d - struct sbmacdma (DMA channel context)
 582  *         s - struct sbmac_softc (pointer to a MAC)
 583  *         chan - channel number (0..1 right now)
 584  *         txrx - Identifies DMA_TX or DMA_RX for channel direction
 585  *      maxdescr - number of descriptors
 586  *
 587  *  Return value:
 588  *         nothing
 589  ********************************************************************* */
 590
 591 static void sbdma_initctx(struct sbmacdma *d, struct sbmac_softc *s, int chan,
 592                           int txrx, int maxdescr)
 593 {
 594 #ifdef CONFIG_SBMAC_COALESCE
 595         int int_pktcnt, int_timeout;
 596 #endif
 597
 598         /*
 599          * Save away interesting stuff in the structure
 600          */
 601
 602         d->sbdma_eth       = s;
 603         d->sbdma_channel   = chan;
 604         d->sbdma_txdir     = txrx;
 605
 606 #if 0
 607         /* RMON clearing */
 608         s->sbe_idx =(s->sbm_base - A_MAC_BASE_0)/MAC_SPACING;
 609 #endif
 610
 611         __raw_writeq(0, s->sbm_base + R_MAC_RMON_TX_BYTES);
 612         __raw_writeq(0, s->sbm_base + R_MAC_RMON_COLLISIONS);
 613         __raw_writeq(0, s->sbm_base + R_MAC_RMON_LATE_COL);
 614         __raw_writeq(0, s->sbm_base + R_MAC_RMON_EX_COL);
 615         __raw_writeq(0, s->sbm_base + R_MAC_RMON_FCS_ERROR);
 616         __raw_writeq(0, s->sbm_base + R_MAC_RMON_TX_ABORT);
 617         __raw_writeq(0, s->sbm_base + R_MAC_RMON_TX_BAD);
 618         __raw_writeq(0, s->sbm_base + R_MAC_RMON_TX_GOOD);
 619         __raw_writeq(0, s->sbm_base + R_MAC_RMON_TX_RUNT);
 620         __raw_writeq(0, s->sbm_base + R_MAC_RMON_TX_OVERSIZE);
 621         __raw_writeq(0, s->sbm_base + R_MAC_RMON_RX_BYTES);
 622         __raw_writeq(0, s->sbm_base + R_MAC_RMON_RX_MCAST);
 623         __raw_writeq(0, s->sbm_base + R_MAC_RMON_RX_BCAST);
 624         __raw_writeq(0, s->sbm_base + R_MAC_RMON_RX_BAD);
 625         __raw_writeq(0, s->sbm_base + R_MAC_RMON_RX_GOOD);
 626         __raw_writeq(0, s->sbm_base + R_MAC_RMON_RX_RUNT);
 627         __raw_writeq(0, s->sbm_base + R_MAC_RMON_RX_OVERSIZE);
 628         __raw_writeq(0, s->sbm_base + R_MAC_RMON_RX_FCS_ERROR);
 629         __raw_writeq(0, s->sbm_base + R_MAC_RMON_RX_LENGTH_ERROR);
 630         __raw_writeq(0, s->sbm_base + R_MAC_RMON_RX_CODE_ERROR);
 631         __raw_writeq(0, s->sbm_base + R_MAC_RMON_RX_ALIGN_ERROR);
 632
 633         /*
 634          * initialize register pointers
 635          */
 636
 637         d->sbdma_config0 =
 638                 s->sbm_base + R_MAC_DMA_REGISTER(txrx,chan,R_MAC_DMA_CONFIG0);
 639         d->sbdma_config1 =
 640                 s->sbm_base + R_MAC_DMA_REGISTER(txrx,chan,R_MAC_DMA_CONFIG1);
 641         d->sbdma_dscrbase =
 642                 s->sbm_base + R_MAC_DMA_REGISTER(txrx,chan,R_MAC_DMA_DSCR_BASE);
 643         d->sbdma_dscrcnt =
 644                 s->sbm_base + R_MAC_DMA_REGISTER(txrx,chan,R_MAC_DMA_DSCR_CNT);
 645         d->sbdma_curdscr =
 646                 s->sbm_base + R_MAC_DMA_REGISTER(txrx,chan,R_MAC_DMA_CUR_DSCRADDR);
 647         if (d->sbdma_txdir)
 648                 d->sbdma_oodpktlost = NULL;
 649         else
 650                 d->sbdma_oodpktlost =
 651                         s->sbm_base + R_MAC_DMA_REGISTER(txrx,chan,R_MAC_DMA_OODPKTLOST_RX);
 652
 653         /*
 654          * Allocate memory for the ring
 655          */
 656
 657         d->sbdma_maxdescr = maxdescr;
 658
 659         d->sbdma_dscrtable_unaligned = kcalloc(d->sbdma_maxdescr + 1,
 660                                                sizeof(*d->sbdma_dscrtable),
 661                                                GFP_KERNEL);
 662
 663         /*
 664          * The descriptor table must be aligned to at least 16 bytes or the
 665          * MAC will corrupt it.
 666          */
 667         d->sbdma_dscrtable = (struct sbdmadscr *)
 668                              ALIGN((unsigned long)d->sbdma_dscrtable_unaligned,
 669                                    sizeof(*d->sbdma_dscrtable));
 670
 671         d->sbdma_dscrtable_end = d->sbdma_dscrtable + d->sbdma_maxdescr;
 672
 673         d->sbdma_dscrtable_phys = virt_to_phys(d->sbdma_dscrtable);
 674
 675         /*
 676          * And context table
 677          */
 678
 679         d->sbdma_ctxtable = kcalloc(d->sbdma_maxdescr,
 680                                     sizeof(*d->sbdma_ctxtable), GFP_KERNEL);
 681
 682 #ifdef CONFIG_SBMAC_COALESCE
 683         /*
 684          * Setup Rx/Tx DMA coalescing defaults
 685          */
 686
 687         int_pktcnt = (txrx == DMA_TX) ? int_pktcnt_tx : int_pktcnt_rx;
 688         if ( int_pktcnt ) {
 689                 d->sbdma_int_pktcnt = int_pktcnt;
 690         } else {
 691                 d->sbdma_int_pktcnt = 1;
 692         }
 693
 694         int_timeout = (txrx == DMA_TX) ? int_timeout_tx : int_timeout_rx;
 695         if ( int_timeout ) {
 696                 d->sbdma_int_timeout = int_timeout;
 697         } else {
 698                 d->sbdma_int_timeout = 0;
 699         }
 700 #endif
 701
 702 }
 703
 704 /**********************************************************************
 705  *  SBDMA_CHANNEL_START(d)
 706  *
 707  *  Initialize the hardware registers for a DMA channel.
 708  *
 709  *  Input parameters:
 710  *         d - DMA channel to init (context must be previously init'd
 711  *         rxtx - DMA_RX or DMA_TX depending on what type of channel
 712  *
 713  *  Return value:
 714  *         nothing
 715  ********************************************************************* */
 716
 717 static void sbdma_channel_start(struct sbmacdma *d, int rxtx)
 718 {
 719         /*
 720          * Turn on the DMA channel
 721          */
 722
 723 #ifdef CONFIG_SBMAC_COALESCE
 724         __raw_writeq(V_DMA_INT_TIMEOUT(d->sbdma_int_timeout) |
 725                        0, d->sbdma_config1);
 726         __raw_writeq(M_DMA_EOP_INT_EN |
 727                        V_DMA_RINGSZ(d->sbdma_maxdescr) |
 728                        V_DMA_INT_PKTCNT(d->sbdma_int_pktcnt) |
 729                        0, d->sbdma_config0);
 730 #else
 731         __raw_writeq(0, d->sbdma_config1);
 732         __raw_writeq(V_DMA_RINGSZ(d->sbdma_maxdescr) |
 733                        0, d->sbdma_config0);
 734 #endif
 735
 736         __raw_writeq(d->sbdma_dscrtable_phys, d->sbdma_dscrbase);
 737
 738         /*
 739          * Initialize ring pointers
 740          */
 741
 742         d->sbdma_addptr = d->sbdma_dscrtable;
 743         d->sbdma_remptr = d->sbdma_dscrtable;
 744 }
 745
 746 /**********************************************************************
 747  *  SBDMA_CHANNEL_STOP(d)
 748  *
 749  *  Initialize the hardware registers for a DMA channel.
 750  *
 751  *  Input parameters:
 752  *         d - DMA channel to init (context must be previously init'd
 753  *
 754  *  Return value:
 755  *         nothing
 756  ********************************************************************* */
 757
 758 static void sbdma_channel_stop(struct sbmacdma *d)
 759 {
 760         /*
 761          * Turn off the DMA channel
 762          */
 763
 764         __raw_writeq(0, d->sbdma_config1);
 765
 766         __raw_writeq(0, d->sbdma_dscrbase);
 767
 768         __raw_writeq(0, d->sbdma_config0);
 769
 770         /*
 771          * Zero ring pointers
 772          */
 773
 774         d->sbdma_addptr = NULL;
 775         d->sbdma_remptr = NULL;
 776 }
 777
 778 static inline void sbdma_align_skb(struct sk_buff *skb,
 779                                    unsigned int power2, unsigned int offset)
 780 {
 781         unsigned char *addr = skb->data;
 782         unsigned char *newaddr = PTR_ALIGN(addr, power2);
 783
 784         skb_reserve(skb, newaddr - addr + offset);
 785 }
 786
 787
 788 /**********************************************************************
 789  *  SBDMA_ADD_RCVBUFFER(d,sb)
 790  *
 791  *  Add a buffer to the specified DMA channel.   For receive channels,
 792  *  this queues a buffer for inbound packets.
 793  *
 794  *  Input parameters:
 795  *         sc - softc structure
 796  *          d - DMA channel descriptor
 797  *         sb - sk_buff to add, or NULL if we should allocate one
 798  *
 799  *  Return value:
 800  *         0 if buffer could not be added (ring is full)
 801  *         1 if buffer added successfully
 802  ********************************************************************* */
 803
 804
 805 static int sbdma_add_rcvbuffer(struct sbmac_softc *sc, struct sbmacdma *d,
 806                                struct sk_buff *sb)
 807 {
 808         struct net_device *dev = sc->sbm_dev;
 809         struct sbdmadscr *dsc;
 810         struct sbdmadscr *nextdsc;
 811         struct sk_buff *sb_new = NULL;
 812         int pktsize = ENET_PACKET_SIZE;
 813
 814         /* get pointer to our current place in the ring */
 815
 816         dsc = d->sbdma_addptr;
 817         nextdsc = SBDMA_NEXTBUF(d,sbdma_addptr);
 818
 819         /*
 820          * figure out if the ring is full - if the next descriptor
 821          * is the same as the one that we're going to remove from
 822          * the ring, the ring is full
 823          */
 824
 825         if (nextdsc == d->sbdma_remptr) {
 826                 return -ENOSPC;
 827         }
 828
 829         /*
 830          * Allocate a sk_buff if we don't already have one.
 831          * If we do have an sk_buff, reset it so that it's empty.
 832          *
 833          * Note: sk_buffs don't seem to be guaranteed to have any sort
 834          * of alignment when they are allocated.  Therefore, allocate enough
 835          * extra space to make sure that:
 836          *
 837          *    1. the data does not start in the middle of a cache line.
 838          *    2. The data does not end in the middle of a cache line
 839          *    3. The buffer can be aligned such that the IP addresses are
 840          *       naturally aligned.
 841          *
 842          *  Remember, the SOCs MAC writes whole cache lines at a time,
 843          *  without reading the old contents first.  So, if the sk_buff's
 844          *  data portion starts in the middle of a cache line, the SOC
 845          *  DMA will trash the beginning (and ending) portions.
 846          */
 847
 848         if (sb == NULL) {
 849                 sb_new = netdev_alloc_skb(dev, ENET_PACKET_SIZE +
 850                                                SMP_CACHE_BYTES * 2 +
 851                                                NET_IP_ALIGN);
 852                 if (sb_new == NULL) {
 853                         pr_info("%s: sk_buff allocation failed\n",
 854                                d->sbdma_eth->sbm_dev->name);
 855                         return -ENOBUFS;
 856                 }
 857
 858                 sbdma_align_skb(sb_new, SMP_CACHE_BYTES, NET_IP_ALIGN);
 859         }
 860         else {
 861                 sb_new = sb;
 862                 /*
 863                  * nothing special to reinit buffer, it's already aligned
 864                  * and sb->data already points to a good place.
 865                  */
 866         }
 867
 868         /*
 869          * fill in the descriptor
 870          */
 871
 872 #ifdef CONFIG_SBMAC_COALESCE
 873         /*
 874          * Do not interrupt per DMA transfer.
 875          */
 876         dsc->dscr_a = virt_to_phys(sb_new->data) |
 877                 V_DMA_DSCRA_A_SIZE(NUMCACHEBLKS(pktsize + NET_IP_ALIGN)) | 0;
 878 #else
 879         dsc->dscr_a = virt_to_phys(sb_new->data) |
 880                 V_DMA_DSCRA_A_SIZE(NUMCACHEBLKS(pktsize + NET_IP_ALIGN)) |
 881                 M_DMA_DSCRA_INTERRUPT;
 882 #endif
 883
 884         /* receiving: no options */
 885         dsc->dscr_b = 0;
 886
 887         /*
 888          * fill in the context
 889          */
 890
 891         d->sbdma_ctxtable[dsc-d->sbdma_dscrtable] = sb_new;
 892
 893         /*
 894          * point at next packet
 895          */
 896
 897         d->sbdma_addptr = nextdsc;
 898
 899         /*
 900          * Give the buffer to the DMA engine.
 901          */
 902
 903         __raw_writeq(1, d->sbdma_dscrcnt);
 904
 905         return 0;                                       /* we did it */
 906 }
 907
 908 /**********************************************************************
 909  *  SBDMA_ADD_TXBUFFER(d,sb)
 910  *
 911  *  Add a transmit buffer to the specified DMA channel, causing a
 912  *  transmit to start.
 913  *
 914  *  Input parameters:
 915  *         d - DMA channel descriptor
 916  *         sb - sk_buff to add
 917  *
 918  *  Return value:
 919  *         0 transmit queued successfully
 920  *         otherwise error code
 921  ********************************************************************* */
 922
 923
 924 static int sbdma_add_txbuffer(struct sbmacdma *d, struct sk_buff *sb)
 925 {
 926         struct sbdmadscr *dsc;
 927         struct sbdmadscr *nextdsc;
 928         uint64_t phys;
 929         uint64_t ncb;
 930         int length;
 931
 932         /* get pointer to our current place in the ring */
 933
 934         dsc = d->sbdma_addptr;
 935         nextdsc = SBDMA_NEXTBUF(d,sbdma_addptr);
 936
 937         /*
 938          * figure out if the ring is full - if the next descriptor
 939          * is the same as the one that we're going to remove from
 940          * the ring, the ring is full
 941          */
 942
 943         if (nextdsc == d->sbdma_remptr) {
 944                 return -ENOSPC;
 945         }
 946
 947         /*
 948          * Under Linux, it's not necessary to copy/coalesce buffers
 949          * like it is on NetBSD.  We think they're all contiguous,
 950          * but that may not be true for GBE.
 951          */
 952
 953         length = sb->len;
 954
 955         /*
 956          * fill in the descriptor.  Note that the number of cache
 957          * blocks in the descriptor is the number of blocks
 958          * *spanned*, so we need to add in the offset (if any)
 959          * while doing the calculation.
 960          */
 961
 962         phys = virt_to_phys(sb->data);
 963         ncb = NUMCACHEBLKS(length+(phys & (SMP_CACHE_BYTES - 1)));
 964
 965         dsc->dscr_a = phys |
 966                 V_DMA_DSCRA_A_SIZE(ncb) |
 967 #ifndef CONFIG_SBMAC_COALESCE
 968                 M_DMA_DSCRA_INTERRUPT |
 969 #endif
 970                 M_DMA_ETHTX_SOP;
 971
 972         /* transmitting: set outbound options and length */
 973
 974         dsc->dscr_b = V_DMA_DSCRB_OPTIONS(K_DMA_ETHTX_APPENDCRC_APPENDPAD) |
 975                 V_DMA_DSCRB_PKT_SIZE(length);
 976
 977         /*
 978          * fill in the context
 979          */
 980
 981         d->sbdma_ctxtable[dsc-d->sbdma_dscrtable] = sb;
 982
 983         /*
 984          * point at next packet
 985          */
 986
 987         d->sbdma_addptr = nextdsc;
 988
 989         /*
 990          * Give the buffer to the DMA engine.
 991          */
 992
 993         __raw_writeq(1, d->sbdma_dscrcnt);
 994
 995         return 0;                                       /* we did it */
 996 }
 997
 998
 999
1000
1001 /**********************************************************************
1002  *  SBDMA_EMPTYRING(d)
1003  *
1004  *  Free all allocated sk_buffs on the specified DMA channel;
1005  *
1006  *  Input parameters:
1007  *         d  - DMA channel
1008  *
1009  *  Return value:
1010  *         nothing
1011  ********************************************************************* */
1012
1013 static void sbdma_emptyring(struct sbmacdma *d)
1014 {
1015         int idx;
1016         struct sk_buff *sb;
1017
1018         for (idx = 0; idx < d->sbdma_maxdescr; idx++) {
1019                 sb = d->sbdma_ctxtable[idx];
1020                 if (sb) {
1021                         dev_kfree_skb(sb);
1022                         d->sbdma_ctxtable[idx] = NULL;
1023                 }
1024         }
1025 }
1026
1027
1028 /**********************************************************************
1029  *  SBDMA_FILLRING(d)
1030  *
1031  *  Fill the specified DMA channel (must be receive channel)
1032  *  with sk_buffs
1033  *
1034  *  Input parameters:
1035  *         sc - softc structure
1036  *          d - DMA channel
1037  *
1038  *  Return value:
1039  *         nothing
1040  ********************************************************************* */
1041
1042 static void sbdma_fillring(struct sbmac_softc *sc, struct sbmacdma *d)
1043 {
1044         int idx;
1045
1046         for (idx = 0; idx < SBMAC_MAX_RXDESCR - 1; idx++) {
1047                 if (sbdma_add_rcvbuffer(sc, d, NULL) != 0)
1048                         break;
1049         }
1050 }
1051
1052 #ifdef CONFIG_NET_POLL_CONTROLLER
1053 static void sbmac_netpoll(struct net_device *netdev)
1054 {
1055         struct sbmac_softc *sc = netdev_priv(netdev);
1056         int irq = sc->sbm_dev->irq;
1057
1058         __raw_writeq(0, sc->sbm_imr);
1059
1060         sbmac_intr(irq, netdev);
1061
1062 #ifdef CONFIG_SBMAC_COALESCE
1063         __raw_writeq(((M_MAC_INT_EOP_COUNT | M_MAC_INT_EOP_TIMER) << S_MAC_TX_CH0) |
1064         ((M_MAC_INT_EOP_COUNT | M_MAC_INT_EOP_TIMER) << S_MAC_RX_CH0),
1065         sc->sbm_imr);
1066 #else
1067         __raw_writeq((M_MAC_INT_CHANNEL << S_MAC_TX_CH0) |
1068         (M_MAC_INT_CHANNEL << S_MAC_RX_CH0), sc->sbm_imr);
1069 #endif
1070 }
1071 #endif
1072
1073 /**********************************************************************
1074  *  SBDMA_RX_PROCESS(sc,d,work_to_do,poll)
1075  *
1076  *  Process "completed" receive buffers on the specified DMA channel.
1077  *
1078  *  Input parameters:
1079  *            sc - softc structure
1080  *             d - DMA channel context
1081  *    work_to_do - no. of packets to process before enabling interrupt
1082  *                 again (for NAPI)
1083  *          poll - 1: using polling (for NAPI)
1084  *
1085  *  Return value:
1086  *         nothing
1087  ********************************************************************* */
1088
1089 static int sbdma_rx_process(struct sbmac_softc *sc, struct sbmacdma *d,
1090                             int work_to_do, int poll)
1091 {
1092         struct net_device *dev = sc->sbm_dev;
1093         int curidx;
1094         int hwidx;
1095         struct sbdmadscr *dsc;
1096         struct sk_buff *sb;
1097         int len;
1098         int work_done = 0;
1099         int dropped = 0;
1100
1101         prefetch(d);
1102
1103 again:
1104         /* Check if the HW dropped any frames */
1105         dev->stats.rx_fifo_errors
1106             += __raw_readq(sc->sbm_rxdma.sbdma_oodpktlost) & 0xffff;
1107         __raw_writeq(0, sc->sbm_rxdma.sbdma_oodpktlost);
1108
1109         while (work_to_do-- > 0) {
1110                 /*
1111                  * figure out where we are (as an index) and where
1112                  * the hardware is (also as an index)
1113                  *
1114                  * This could be done faster if (for example) the
1115                  * descriptor table was page-aligned and contiguous in
1116                  * both virtual and physical memory -- you could then
1117                  * just compare the low-order bits of the virtual address
1118                  * (sbdma_remptr) and the physical address (sbdma_curdscr CSR)
1119                  */
1120
1121                 dsc = d->sbdma_remptr;
1122                 curidx = dsc - d->sbdma_dscrtable;
1123
1124                 prefetch(dsc);
1125                 prefetch(&d->sbdma_ctxtable[curidx]);
1126
1127                 hwidx = ((__raw_readq(d->sbdma_curdscr) & M_DMA_CURDSCR_ADDR) -
1128                          d->sbdma_dscrtable_phys) /
1129                         sizeof(*d->sbdma_dscrtable);
1130
1131                 /*
1132                  * If they're the same, that means we've processed all
1133                  * of the descriptors up to (but not including) the one that
1134                  * the hardware is working on right now.
1135                  */
1136
1137                 if (curidx == hwidx)
1138                         goto done;
1139
1140                 /*
1141                  * Otherwise, get the packet's sk_buff ptr back
1142                  */
1143
1144                 sb = d->sbdma_ctxtable[curidx];
1145                 d->sbdma_ctxtable[curidx] = NULL;
1146
1147                 len = (int)G_DMA_DSCRB_PKT_SIZE(dsc->dscr_b) - 4;
1148
1149                 /*
1150                  * Check packet status.  If good, process it.
1151                  * If not, silently drop it and put it back on the
1152                  * receive ring.
1153                  */
1154
1155                 if (likely (!(dsc->dscr_a & M_DMA_ETHRX_BAD))) {
1156
1157                         /*
1158                          * Add a new buffer to replace the old one.  If we fail
1159                          * to allocate a buffer, we're going to drop this
1160                          * packet and put it right back on the receive ring.
1161                          */
1162
1163                         if (unlikely(sbdma_add_rcvbuffer(sc, d, NULL) ==
1164                                      -ENOBUFS)) {
1165                                 dev->stats.rx_dropped++;
1166                                 /* Re-add old buffer */
1167                                 sbdma_add_rcvbuffer(sc, d, sb);
1168                                 /* No point in continuing at the moment */
1169                                 printk(KERN_ERR "dropped packet (1)\n");
1170                                 d->sbdma_remptr = SBDMA_NEXTBUF(d,sbdma_remptr);
1171                                 goto done;
1172                         } else {
1173                                 /*
1174                                  * Set length into the packet
1175                                  */
1176                                 skb_put(sb,len);
1177
1178                                 /*
1179                                  * Buffer has been replaced on the
1180                                  * receive ring.  Pass the buffer to
1181                                  * the kernel
1182                                  */
1183                                 sb->protocol = eth_type_trans(sb,d->sbdma_eth->sbm_dev);
1184                                 /* Check hw IPv4/TCP checksum if supported */
1185                                 if (sc->rx_hw_checksum == ENABLE) {
1186                                         if (!((dsc->dscr_a) & M_DMA_ETHRX_BADIP4CS) &&
1187                                             !((dsc->dscr_a) & M_DMA_ETHRX_BADTCPCS)) {
1188                                                 sb->ip_summed = CHECKSUM_UNNECESSARY;
1189                                                 /* don't need to set sb->csum */
1190                                         } else {
1191                                                 sb->ip_summed = CHECKSUM_NONE;
1192                                         }
1193                                 }
1194                                 prefetch(sb->data);
1195                                 prefetch((const void *)(((char *)sb->data)+32));
1196                                 if (poll)
1197                                         dropped = netif_receive_skb(sb);
1198                                 else
1199                                         dropped = netif_rx(sb);
1200
1201                                 if (dropped == NET_RX_DROP) {
1202                                         dev->stats.rx_dropped++;
1203                                         d->sbdma_remptr = SBDMA_NEXTBUF(d,sbdma_remptr);
1204                                         goto done;
1205                                 }
1206                                 else {
1207                                         dev->stats.rx_bytes += len;
1208                                         dev->stats.rx_packets++;
1209                                 }
1210                         }
1211                 } else {
1212                         /*
1213                          * Packet was mangled somehow.  Just drop it and
1214                          * put it back on the receive ring.
1215                          */
1216                         dev->stats.rx_errors++;
1217                         sbdma_add_rcvbuffer(sc, d, sb);
1218                 }
1219
1220
1221                 /*
1222                  * .. and advance to the next buffer.
1223                  */
1224
1225                 d->sbdma_remptr = SBDMA_NEXTBUF(d,sbdma_remptr);
1226                 work_done++;
1227         }
1228         if (!poll) {
1229                 work_to_do = 32;
1230                 goto again; /* collect fifo drop statistics again */
1231         }
1232 done:
1233         return work_done;
1234 }
1235
1236 /**********************************************************************
1237  *  SBDMA_TX_PROCESS(sc,d)
1238  *
1239  *  Process "completed" transmit buffers on the specified DMA channel.
1240  *  This is normally called within the interrupt service routine.
1241  *  Note that this isn't really ideal for priority channels, since
1242  *  it processes all of the packets on a given channel before
1243  *  returning.
1244  *
1245  *  Input parameters:
1246  *      sc - softc structure
1247  *       d - DMA channel context
1248  *    poll - 1: using polling (for NAPI)
1249  *
1250  *  Return value:
1251  *         nothing
1252  ********************************************************************* */
1253
1254 static void sbdma_tx_process(struct sbmac_softc *sc, struct sbmacdma *d,
1255                              int poll)
1256 {
1257         struct net_device *dev = sc->sbm_dev;
1258         int curidx;
1259         int hwidx;
1260         struct sbdmadscr *dsc;
1261         struct sk_buff *sb;
1262         unsigned long flags;
1263         int packets_handled = 0;
1264
1265         spin_lock_irqsave(&(sc->sbm_lock), flags);
1266
1267         if (d->sbdma_remptr == d->sbdma_addptr)
1268           goto end_unlock;
1269
1270         hwidx = ((__raw_readq(d->sbdma_curdscr) & M_DMA_CURDSCR_ADDR) -
1271                  d->sbdma_dscrtable_phys) / sizeof(*d->sbdma_dscrtable);
1272
1273         for (;;) {
1274                 /*
1275                  * figure out where we are (as an index) and where
1276                  * the hardware is (also as an index)
1277                  *
1278                  * This could be done faster if (for example) the
1279                  * descriptor table was page-aligned and contiguous in
1280                  * both virtual and physical memory -- you could then
1281                  * just compare the low-order bits of the virtual address
1282                  * (sbdma_remptr) and the physical address (sbdma_curdscr CSR)
1283                  */
1284
1285                 curidx = d->sbdma_remptr - d->sbdma_dscrtable;
1286
1287                 /*
1288                  * If they're the same, that means we've processed all
1289                  * of the descriptors up to (but not including) the one that
1290                  * the hardware is working on right now.
1291                  */
1292
1293                 if (curidx == hwidx)
1294                         break;
1295
1296                 /*
1297                  * Otherwise, get the packet's sk_buff ptr back
1298                  */
1299
1300                 dsc = &(d->sbdma_dscrtable[curidx]);
1301                 sb = d->sbdma_ctxtable[curidx];
1302                 d->sbdma_ctxtable[curidx] = NULL;
1303
1304                 /*
1305                  * Stats
1306                  */
1307
1308                 dev->stats.tx_bytes += sb->len;
1309                 dev->stats.tx_packets++;
1310
1311                 /*
1312                  * for transmits, we just free buffers.
1313                  */
1314
1315                 dev_kfree_skb_irq(sb);
1316
1317                 /*
1318                  * .. and advance to the next buffer.
1319                  */
1320
1321                 d->sbdma_remptr = SBDMA_NEXTBUF(d,sbdma_remptr);
1322
1323                 packets_handled++;
1324
1325         }
1326
1327         /*
1328          * Decide if we should wake up the protocol or not.
1329          * Other drivers seem to do this when we reach a low
1330          * watermark on the transmit queue.
1331          */
1332
1333         if (packets_handled)
1334                 netif_wake_queue(d->sbdma_eth->sbm_dev);
1335
1336 end_unlock:
1337         spin_unlock_irqrestore(&(sc->sbm_lock), flags);
1338
1339 }
1340
1341
1342
1343 /**********************************************************************
1344  *  SBMAC_INITCTX(s)
1345  *
1346  *  Initialize an Ethernet context structure - this is called
1347  *  once per MAC on the 1250.  Memory is allocated here, so don't
1348  *  call it again from inside the ioctl routines that bring the
1349  *  interface up/down
1350  *
1351  *  Input parameters:
1352  *         s - sbmac context structure
1353  *
1354  *  Return value:
1355  *         0
1356  ********************************************************************* */
1357
1358 static int sbmac_initctx(struct sbmac_softc *s)
1359 {
1360
1361         /*
1362          * figure out the addresses of some ports
1363          */
1364
1365         s->sbm_macenable = s->sbm_base + R_MAC_ENABLE;
1366         s->sbm_maccfg    = s->sbm_base + R_MAC_CFG;
1367         s->sbm_fifocfg   = s->sbm_base + R_MAC_THRSH_CFG;
1368         s->sbm_framecfg  = s->sbm_base + R_MAC_FRAMECFG;
1369         s->sbm_rxfilter  = s->sbm_base + R_MAC_ADFILTER_CFG;
1370         s->sbm_isr       = s->sbm_base + R_MAC_STATUS;
1371         s->sbm_imr       = s->sbm_base + R_MAC_INT_MASK;
1372         s->sbm_mdio      = s->sbm_base + R_MAC_MDIO;
1373
1374         /*
1375          * Initialize the DMA channels.  Right now, only one per MAC is used
1376          * Note: Only do this _once_, as it allocates memory from the kernel!
1377          */
1378
1379         sbdma_initctx(&(s->sbm_txdma),s,0,DMA_TX,SBMAC_MAX_TXDESCR);
1380         sbdma_initctx(&(s->sbm_rxdma),s,0,DMA_RX,SBMAC_MAX_RXDESCR);
1381
1382         /*
1383          * initial state is OFF
1384          */
1385
1386         s->sbm_state = sbmac_state_off;
1387
1388         return 0;
1389 }
1390
1391
1392 static void sbdma_uninitctx(struct sbmacdma *d)
1393 {
1394         if (d->sbdma_dscrtable_unaligned) {
1395                 kfree(d->sbdma_dscrtable_unaligned);
1396                 d->sbdma_dscrtable_unaligned = d->sbdma_dscrtable = NULL;
1397         }
1398
1399         if (d->sbdma_ctxtable) {
1400                 kfree(d->sbdma_ctxtable);
1401                 d->sbdma_ctxtable = NULL;
1402         }
1403 }
1404
1405
1406 static void sbmac_uninitctx(struct sbmac_softc *sc)
1407 {
1408         sbdma_uninitctx(&(sc->sbm_txdma));
1409         sbdma_uninitctx(&(sc->sbm_rxdma));
1410 }
1411
1412
1413 /**********************************************************************
1414  *  SBMAC_CHANNEL_START(s)
1415  *
1416  *  Start packet processing on this MAC.
1417  *
1418  *  Input parameters:
1419  *         s - sbmac structure
1420  *
1421  *  Return value:
1422  *         nothing
1423  ********************************************************************* */
1424
1425 static void sbmac_channel_start(struct sbmac_softc *s)
1426 {
1427         uint64_t reg;
1428         void __iomem *port;
1429         uint64_t cfg,fifo,framecfg;
1430         int idx, th_value;
1431
1432         /*
1433          * Don't do this if running
1434          */
1435
1436         if (s->sbm_state == sbmac_state_on)
1437                 return;
1438
1439         /*
1440          * Bring the controller out of reset, but leave it off.
1441          */
1442
1443         __raw_writeq(0, s->sbm_macenable);
1444
1445         /*
1446          * Ignore all received packets
1447          */
1448
1449         __raw_writeq(0, s->sbm_rxfilter);
1450
1451         /*
1452          * Calculate values for various control registers.
1453          */
1454
1455         cfg = M_MAC_RETRY_EN |
1456                 M_MAC_TX_HOLD_SOP_EN |
1457                 V_MAC_TX_PAUSE_CNT_16K |
1458                 M_MAC_AP_STAT_EN |
1459                 M_MAC_FAST_SYNC |
1460                 M_MAC_SS_EN |
1461                 0;
1462
1463         /*
1464          * Be sure that RD_THRSH+WR_THRSH <= 32 for pass1 pars
1465          * and make sure that RD_THRSH + WR_THRSH <=128 for pass2 and above
1466          * Use a larger RD_THRSH for gigabit
1467          */
1468         if (soc_type == K_SYS_SOC_TYPE_BCM1250 && periph_rev < 2)
1469                 th_value = 28;
1470         else
1471                 th_value = 64;
1472
1473         fifo = V_MAC_TX_WR_THRSH(4) |   /* Must be '4' or '8' */
1474                 ((s->sbm_speed == sbmac_speed_1000)
1475                  ? V_MAC_TX_RD_THRSH(th_value) : V_MAC_TX_RD_THRSH(4)) |
1476                 V_MAC_TX_RL_THRSH(4) |
1477                 V_MAC_RX_PL_THRSH(4) |
1478                 V_MAC_RX_RD_THRSH(4) |  /* Must be '4' */
1479                 V_MAC_RX_PL_THRSH(4) |
1480                 V_MAC_RX_RL_THRSH(8) |
1481                 0;
1482
1483         framecfg = V_MAC_MIN_FRAMESZ_DEFAULT |
1484                 V_MAC_MAX_FRAMESZ_DEFAULT |
1485                 V_MAC_BACKOFF_SEL(1);
1486
1487         /*
1488          * Clear out the hash address map
1489          */
1490
1491         port = s->sbm_base + R_MAC_HASH_BASE;
1492         for (idx = 0; idx < MAC_HASH_COUNT; idx++) {
1493                 __raw_writeq(0, port);
1494                 port += sizeof(uint64_t);
1495         }
1496
1497         /*
1498          * Clear out the exact-match table
1499          */
1500
1501         port = s->sbm_base + R_MAC_ADDR_BASE;
1502         for (idx = 0; idx < MAC_ADDR_COUNT; idx++) {
1503                 __raw_writeq(0, port);
1504                 port += sizeof(uint64_t);
1505         }
1506
1507         /*
1508          * Clear out the DMA Channel mapping table registers
1509          */
1510
1511         port = s->sbm_base + R_MAC_CHUP0_BASE;
1512         for (idx = 0; idx < MAC_CHMAP_COUNT; idx++) {
1513                 __raw_writeq(0, port);
1514                 port += sizeof(uint64_t);
1515         }
1516
1517
1518         port = s->sbm_base + R_MAC_CHLO0_BASE;
1519         for (idx = 0; idx < MAC_CHMAP_COUNT; idx++) {
1520                 __raw_writeq(0, port);
1521                 port += sizeof(uint64_t);
1522         }
1523
1524         /*
1525          * Program the hardware address.  It goes into the hardware-address
1526          * register as well as the first filter register.
1527          */
1528
1529         reg = sbmac_addr2reg(s->sbm_hwaddr);
1530
1531         port = s->sbm_base + R_MAC_ADDR_BASE;
1532         __raw_writeq(reg, port);
1533         port = s->sbm_base + R_MAC_ETHERNET_ADDR;
1534
1535 #ifdef CONFIG_SB1_PASS_1_WORKAROUNDS
1536         /*
1537          * Pass1 SOCs do not receive packets addressed to the
1538          * destination address in the R_MAC_ETHERNET_ADDR register.
1539          * Set the value to zero.
1540          */
1541         __raw_writeq(0, port);
1542 #else
1543         __raw_writeq(reg, port);
1544 #endif
1545
1546         /*
1547          * Set the receive filter for no packets, and write values
1548          * to the various config registers
1549          */
1550
1551         __raw_writeq(0, s->sbm_rxfilter);
1552         __raw_writeq(0, s->sbm_imr);
1553         __raw_writeq(framecfg, s->sbm_framecfg);
1554         __raw_writeq(fifo, s->sbm_fifocfg);
1555         __raw_writeq(cfg, s->sbm_maccfg);
1556
1557         /*
1558          * Initialize DMA channels (rings should be ok now)
1559          */
1560
1561         sbdma_channel_start(&(s->sbm_rxdma), DMA_RX);
1562         sbdma_channel_start(&(s->sbm_txdma), DMA_TX);
1563
1564         /*
1565          * Configure the speed, duplex, and flow control
1566          */
1567
1568         sbmac_set_speed(s,s->sbm_speed);
1569         sbmac_set_duplex(s,s->sbm_duplex,s->sbm_fc);
1570
1571         /*
1572          * Fill the receive ring
1573          */
1574
1575         sbdma_fillring(s, &(s->sbm_rxdma));
1576
1577         /*
1578          * Turn on the rest of the bits in the enable register
1579          */
1580
1581 #if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80)
1582         __raw_writeq(M_MAC_RXDMA_EN0 |
1583                        M_MAC_TXDMA_EN0, s->sbm_macenable);
1584 #elif defined(CONFIG_SIBYTE_SB1250) || defined(CONFIG_SIBYTE_BCM112X)
1585         __raw_writeq(M_MAC_RXDMA_EN0 |
1586                        M_MAC_TXDMA_EN0 |
1587                        M_MAC_RX_ENABLE |
1588                        M_MAC_TX_ENABLE, s->sbm_macenable);
1589 #else
1590 #error invalid SiByte MAC configuation
1591 #endif
1592
1593 #ifdef CONFIG_SBMAC_COALESCE
1594         __raw_writeq(((M_MAC_INT_EOP_COUNT | M_MAC_INT_EOP_TIMER) << S_MAC_TX_CH0) |
1595                        ((M_MAC_INT_EOP_COUNT | M_MAC_INT_EOP_TIMER) << S_MAC_RX_CH0), s->sbm_imr);
1596 #else
1597         __raw_writeq((M_MAC_INT_CHANNEL << S_MAC_TX_CH0) |
1598                        (M_MAC_INT_CHANNEL << S_MAC_RX_CH0), s->sbm_imr);
1599 #endif
1600
1601         /*
1602          * Enable receiving unicasts and broadcasts
1603          */
1604
1605         __raw_writeq(M_MAC_UCAST_EN | M_MAC_BCAST_EN, s->sbm_rxfilter);
1606
1607         /*
1608          * we're running now.
1609          */
1610
1611         s->sbm_state = sbmac_state_on;
1612
1613         /*
1614          * Program multicast addresses
1615          */
1616
1617         sbmac_setmulti(s);
1618
1619         /*
1620          * If channel was in promiscuous mode before, turn that on
1621          */
1622
1623         if (s->sbm_devflags & IFF_PROMISC) {
1624                 sbmac_promiscuous_mode(s,1);
1625         }
1626
1627 }
1628
1629
1630 /**********************************************************************
1631  *  SBMAC_CHANNEL_STOP(s)
1632  *
1633  *  Stop packet processing on this MAC.
1634  *
1635  *  Input parameters:
1636  *         s - sbmac structure
1637  *
1638  *  Return value:
1639  *         nothing
1640  ********************************************************************* */
1641
1642 static void sbmac_channel_stop(struct sbmac_softc *s)
1643 {
1644         /* don't do this if already stopped */
1645
1646         if (s->sbm_state == sbmac_state_off)
1647                 return;
1648
1649         /* don't accept any packets, disable all interrupts */
1650
1651         __raw_writeq(0, s->sbm_rxfilter);
1652         __raw_writeq(0, s->sbm_imr);
1653
1654         /* Turn off ticker */
1655
1656         /* XXX */
1657
1658         /* turn off receiver and transmitter */
1659
1660         __raw_writeq(0, s->sbm_macenable);
1661
1662         /* We're stopped now. */
1663
1664         s->sbm_state = sbmac_state_off;
1665
1666         /*
1667          * Stop DMA channels (rings should be ok now)
1668          */
1669
1670         sbdma_channel_stop(&(s->sbm_rxdma));
1671         sbdma_channel_stop(&(s->sbm_txdma));
1672
1673         /* Empty the receive and transmit rings */
1674
1675         sbdma_emptyring(&(s->sbm_rxdma));
1676         sbdma_emptyring(&(s->sbm_txdma));
1677
1678 }
1679
1680 /**********************************************************************
1681  *  SBMAC_SET_CHANNEL_STATE(state)
1682  *
1683  *  Set the channel's state ON or OFF
1684  *
1685  *  Input parameters:
1686  *         state - new state
1687  *
1688  *  Return value:
1689  *         old state
1690  ********************************************************************* */
1691 static enum sbmac_state sbmac_set_channel_state(struct sbmac_softc *sc,
1692                                                 enum sbmac_state state)
1693 {
1694         enum sbmac_state oldstate = sc->sbm_state;
1695
1696         /*
1697          * If same as previous state, return
1698          */
1699
1700         if (state == oldstate) {
1701                 return oldstate;
1702         }
1703
1704         /*
1705          * If new state is ON, turn channel on
1706          */
1707
1708         if (state == sbmac_state_on) {
1709                 sbmac_channel_start(sc);
1710         }
1711         else {
1712                 sbmac_channel_stop(sc);
1713         }
1714
1715         /*
1716          * Return previous state
1717          */
1718
1719         return oldstate;
1720 }
1721
1722
1723 /**********************************************************************
1724  *  SBMAC_PROMISCUOUS_MODE(sc,onoff)
1725  *
1726  *  Turn on or off promiscuous mode
1727  *
1728  *  Input parameters:
1729  *         sc - softc
1730  *      onoff - 1 to turn on, 0 to turn off
1731  *
1732  *  Return value:
1733  *         nothing
1734  ********************************************************************* */
1735
1736 static void sbmac_promiscuous_mode(struct sbmac_softc *sc,int onoff)
1737 {
1738         uint64_t reg;
1739
1740         if (sc->sbm_state != sbmac_state_on)
1741                 return;
1742
1743         if (onoff) {
1744                 reg = __raw_readq(sc->sbm_rxfilter);
1745                 reg |= M_MAC_ALLPKT_EN;
1746                 __raw_writeq(reg, sc->sbm_rxfilter);
1747         }
1748         else {
1749                 reg = __raw_readq(sc->sbm_rxfilter);
1750                 reg &= ~M_MAC_ALLPKT_EN;
1751                 __raw_writeq(reg, sc->sbm_rxfilter);
1752         }
1753 }
1754
1755 /**********************************************************************
1756  *  SBMAC_SETIPHDR_OFFSET(sc,onoff)
1757  *
1758  *  Set the iphdr offset as 15 assuming ethernet encapsulation
1759  *
1760  *  Input parameters:
1761  *         sc - softc
1762  *
1763  *  Return value:
1764  *         nothing
1765  ********************************************************************* */
1766
1767 static void sbmac_set_iphdr_offset(struct sbmac_softc *sc)
1768 {
1769         uint64_t reg;
1770
1771         /* Hard code the off set to 15 for now */
1772         reg = __raw_readq(sc->sbm_rxfilter);
1773         reg &= ~M_MAC_IPHDR_OFFSET | V_MAC_IPHDR_OFFSET(15);
1774         __raw_writeq(reg, sc->sbm_rxfilter);
1775
1776         /* BCM1250 pass1 didn't have hardware checksum.  Everything
1777            later does.  */
1778         if (soc_type == K_SYS_SOC_TYPE_BCM1250 && periph_rev < 2) {
1779                 sc->rx_hw_checksum = DISABLE;
1780         } else {
1781                 sc->rx_hw_checksum = ENABLE;
1782         }
1783 }
1784
1785
1786 /**********************************************************************
1787  *  SBMAC_ADDR2REG(ptr)
1788  *
1789  *  Convert six bytes into the 64-bit register value that
1790  *  we typically write into the SBMAC's address/mcast registers
1791  *
1792  *  Input parameters:
1793  *         ptr - pointer to 6 bytes
1794  *
1795  *  Return value:
1796  *         register value
1797  ********************************************************************* */
1798
1799 static uint64_t sbmac_addr2reg(unsigned char *ptr)
1800 {
1801         uint64_t reg = 0;
1802
1803         ptr += 6;
1804
1805         reg |= (uint64_t) *(--ptr);
1806         reg <<= 8;
1807         reg |= (uint64_t) *(--ptr);
1808         reg <<= 8;
1809         reg |= (uint64_t) *(--ptr);
1810         reg <<= 8;
1811         reg |= (uint64_t) *(--ptr);
1812         reg <<= 8;
1813         reg |= (uint64_t) *(--ptr);
1814         reg <<= 8;
1815         reg |= (uint64_t) *(--ptr);
1816
1817         return reg;
1818 }
1819
1820
1821 /**********************************************************************
1822  *  SBMAC_SET_SPEED(s,speed)
1823  *
1824  *  Configure LAN speed for the specified MAC.
1825  *  Warning: must be called when MAC is off!
1826  *
1827  *  Input parameters:
1828  *         s - sbmac structure
1829  *         speed - speed to set MAC to (see enum sbmac_speed)
1830  *
1831  *  Return value:
1832  *         1 if successful
1833  *      0 indicates invalid parameters
1834  ********************************************************************* */
1835
1836 static int sbmac_set_speed(struct sbmac_softc *s, enum sbmac_speed speed)
1837 {
1838         uint64_t cfg;
1839         uint64_t framecfg;
1840
1841         /*
1842          * Save new current values
1843          */
1844
1845         s->sbm_speed = speed;
1846
1847         if (s->sbm_state == sbmac_state_on)
1848                 return 0;       /* save for next restart */
1849
1850         /*
1851          * Read current register values
1852          */
1853
1854         cfg = __raw_readq(s->sbm_maccfg);
1855         framecfg = __raw_readq(s->sbm_framecfg);
1856
1857         /*
1858          * Mask out the stuff we want to change
1859          */
1860
1861         cfg &= ~(M_MAC_BURST_EN | M_MAC_SPEED_SEL);
1862         framecfg &= ~(M_MAC_IFG_RX | M_MAC_IFG_TX | M_MAC_IFG_THRSH |
1863                       M_MAC_SLOT_SIZE);
1864
1865         /*
1866          * Now add in the new bits
1867          */
1868
1869         switch (speed) {
1870         case sbmac_speed_10:
1871                 framecfg |= V_MAC_IFG_RX_10 |
1872                         V_MAC_IFG_TX_10 |
1873                         K_MAC_IFG_THRSH_10 |
1874                         V_MAC_SLOT_SIZE_10;
1875                 cfg |= V_MAC_SPEED_SEL_10MBPS;
1876                 break;
1877
1878         case sbmac_speed_100:
1879                 framecfg |= V_MAC_IFG_RX_100 |
1880                         V_MAC_IFG_TX_100 |
1881                         V_MAC_IFG_THRSH_100 |
1882                         V_MAC_SLOT_SIZE_100;
1883                 cfg |= V_MAC_SPEED_SEL_100MBPS ;
1884                 break;
1885
1886         case sbmac_speed_1000:
1887                 framecfg |= V_MAC_IFG_RX_1000 |
1888                         V_MAC_IFG_TX_1000 |
1889                         V_MAC_IFG_THRSH_1000 |
1890                         V_MAC_SLOT_SIZE_1000;
1891                 cfg |= V_MAC_SPEED_SEL_1000MBPS | M_MAC_BURST_EN;
1892                 break;
1893
1894         default:
1895                 return 0;
1896         }
1897
1898         /*
1899          * Send the bits back to the hardware
1900          */
1901
1902         __raw_writeq(framecfg, s->sbm_framecfg);
1903         __raw_writeq(cfg, s->sbm_maccfg);
1904
1905         return 1;
1906 }
1907
1908 /**********************************************************************
1909  *  SBMAC_SET_DUPLEX(s,duplex,fc)
1910  *
1911  *  Set Ethernet duplex and flow control options for this MAC
1912  *  Warning: must be called when MAC is off!
1913  *
1914  *  Input parameters:
1915  *         s - sbmac structure
1916  *         duplex - duplex setting (see enum sbmac_duplex)
1917  *         fc - flow control setting (see enum sbmac_fc)
1918  *
1919  *  Return value:
1920  *         1 if ok
1921  *         0 if an invalid parameter combination was specified
1922  ********************************************************************* */
1923
1924 static int sbmac_set_duplex(struct sbmac_softc *s, enum sbmac_duplex duplex,
1925                             enum sbmac_fc fc)
1926 {
1927         uint64_t cfg;
1928
1929         /*
1930          * Save new current values
1931          */
1932
1933         s->sbm_duplex = duplex;
1934         s->sbm_fc = fc;
1935
1936         if (s->sbm_state == sbmac_state_on)
1937                 return 0;       /* save for next restart */
1938
1939         /*
1940          * Read current register values
1941          */
1942
1943         cfg = __raw_readq(s->sbm_maccfg);
1944
1945         /*
1946          * Mask off the stuff we're about to change
1947          */
1948
1949         cfg &= ~(M_MAC_FC_SEL | M_MAC_FC_CMD | M_MAC_HDX_EN);
1950
1951
1952         switch (duplex) {
1953         case sbmac_duplex_half:
1954                 switch (fc) {
1955                 case sbmac_fc_disabled:
1956                         cfg |= M_MAC_HDX_EN | V_MAC_FC_CMD_DISABLED;
1957                         break;
1958
1959                 case sbmac_fc_collision:
1960                         cfg |= M_MAC_HDX_EN | V_MAC_FC_CMD_ENABLED;
1961                         break;
1962
1963                 case sbmac_fc_carrier:
1964                         cfg |= M_MAC_HDX_EN | V_MAC_FC_CMD_ENAB_FALSECARR;
1965                         break;
1966
1967                 case sbmac_fc_frame:            /* not valid in half duplex */
1968                 default:                        /* invalid selection */
1969                         return 0;
1970                 }
1971                 break;
1972
1973         case sbmac_duplex_full:
1974                 switch (fc) {
1975                 case sbmac_fc_disabled:
1976                         cfg |= V_MAC_FC_CMD_DISABLED;
1977                         break;
1978
1979                 case sbmac_fc_frame:
1980                         cfg |= V_MAC_FC_CMD_ENABLED;
1981                         break;
1982
1983                 case sbmac_fc_collision:        /* not valid in full duplex */
1984                 case sbmac_fc_carrier:          /* not valid in full duplex */
1985                 default:
1986                         return 0;
1987                 }
1988                 break;
1989         default:
1990                 return 0;
1991         }
1992
1993         /*
1994          * Send the bits back to the hardware
1995          */
1996
1997         __raw_writeq(cfg, s->sbm_maccfg);
1998
1999         return 1;
2000 }
2001
2002
2003
2004
2005 /**********************************************************************
2006  *  SBMAC_INTR()
2007  *
2008  *  Interrupt handler for MAC interrupts
2009  *
2010  *  Input parameters:
2011  *         MAC structure
2012  *
2013  *  Return value:
2014  *         nothing
2015  ********************************************************************* */
2016 static irqreturn_t sbmac_intr(int irq,void *dev_instance)
2017 {
2018         struct net_device *dev = (struct net_device *) dev_instance;
2019         struct sbmac_softc *sc = netdev_priv(dev);
2020         uint64_t isr;
2021         int handled = 0;
2022
2023         /*
2024          * Read the ISR (this clears the bits in the real
2025          * register, except for counter addr)
2026          */
2027
2028         isr = __raw_readq(sc->sbm_isr) & ~M_MAC_COUNTER_ADDR;
2029
2030         if (isr == 0)
2031                 return IRQ_RETVAL(0);
2032         handled = 1;
2033
2034         /*
2035          * Transmits on channel 0
2036          */
2037
2038         if (isr & (M_MAC_INT_CHANNEL << S_MAC_TX_CH0))
2039                 sbdma_tx_process(sc,&(sc->sbm_txdma), 0);
2040
2041         if (isr & (M_MAC_INT_CHANNEL << S_MAC_RX_CH0)) {
2042                 if (netif_rx_schedule_prep(dev, &sc->napi)) {
2043                         __raw_writeq(0, sc->sbm_imr);
2044                         __netif_rx_schedule(dev, &sc->napi);
2045                         /* Depend on the exit from poll to reenable intr */
2046                 }
2047                 else {
2048                         /* may leave some packets behind */
2049                         sbdma_rx_process(sc,&(sc->sbm_rxdma),
2050                                          SBMAC_MAX_RXDESCR * 2, 0);
2051                 }
2052         }
2053         return IRQ_RETVAL(handled);
2054 }
2055
2056 /**********************************************************************
2057  *  SBMAC_START_TX(skb,dev)
2058  *
2059  *  Start output on the specified interface.  Basically, we
2060  *  queue as many buffers as we can until the ring fills up, or
2061  *  we run off the end of the queue, whichever comes first.
2062  *
2063  *  Input parameters:
2064  *
2065  *
2066  *  Return value:
2067  *         nothing
2068  ********************************************************************* */
2069 static int sbmac_start_tx(struct sk_buff *skb, struct net_device *dev)
2070 {
2071         struct sbmac_softc *sc = netdev_priv(dev);
2072
2073         /* lock eth irq */
2074         spin_lock_irq (&sc->sbm_lock);
2075
2076         /*
2077          * Put the buffer on the transmit ring.  If we
2078          * don't have room, stop the queue.
2079          */
2080
2081         if (sbdma_add_txbuffer(&(sc->sbm_txdma),skb)) {
2082                 /* XXX save skb that we could not send */
2083                 netif_stop_queue(dev);
2084                 spin_unlock_irq(&sc->sbm_lock);
2085
2086                 return 1;
2087         }
2088
2089         dev->trans_start = jiffies;
2090
2091         spin_unlock_irq (&sc->sbm_lock);
2092
2093         return 0;
2094 }
2095
2096 /**********************************************************************
2097  *  SBMAC_SETMULTI(sc)
2098  *
2099  *  Reprogram the multicast table into the hardware, given
2100  *  the list of multicasts associated with the interface
2101  *  structure.
2102  *
2103  *  Input parameters:
2104  *         sc - softc
2105  *
2106  *  Return value:
2107  *         nothing
2108  ********************************************************************* */
2109
2110 static void sbmac_setmulti(struct sbmac_softc *sc)
2111 {
2112         uint64_t reg;
2113         void __iomem *port;
2114         int idx;
2115         struct dev_mc_list *mclist;
2116         struct net_device *dev = sc->sbm_dev;
2117
2118         /*
2119          * Clear out entire multicast table.  We do this by nuking
2120          * the entire hash table and all the direct matches except
2121          * the first one, which is used for our station address
2122          */
2123
2124         for (idx = 1; idx < MAC_ADDR_COUNT; idx++) {
2125                 port = sc->sbm_base + R_MAC_ADDR_BASE+(idx*sizeof(uint64_t));
2126                 __raw_writeq(0, port);
2127         }
2128
2129         for (idx = 0; idx < MAC_HASH_COUNT; idx++) {
2130                 port = sc->sbm_base + R_MAC_HASH_BASE+(idx*sizeof(uint64_t));
2131                 __raw_writeq(0, port);
2132         }
2133
2134         /*
2135          * Clear the filter to say we don't want any multicasts.
2136          */
2137
2138         reg = __raw_readq(sc->sbm_rxfilter);
2139         reg &= ~(M_MAC_MCAST_INV | M_MAC_MCAST_EN);
2140         __raw_writeq(reg, sc->sbm_rxfilter);
2141
2142         if (dev->flags & IFF_ALLMULTI) {
2143                 /*
2144                  * Enable ALL multicasts.  Do this by inverting the
2145                  * multicast enable bit.
2146                  */
2147                 reg = __raw_readq(sc->sbm_rxfilter);
2148                 reg |= (M_MAC_MCAST_INV | M_MAC_MCAST_EN);
2149                 __raw_writeq(reg, sc->sbm_rxfilter);
2150                 return;
2151         }
2152
2153
2154         /*
2155          * Progam new multicast entries.  For now, only use the
2156          * perfect filter.  In the future we'll need to use the
2157          * hash filter if the perfect filter overflows
2158          */
2159
2160         /* XXX only using perfect filter for now, need to use hash
2161          * XXX if the table overflows */
2162
2163         idx = 1;                /* skip station address */
2164         mclist = dev->mc_list;
2165         while (mclist && (idx < MAC_ADDR_COUNT)) {
2166                 reg = sbmac_addr2reg(mclist->dmi_addr);
2167                 port = sc->sbm_base + R_MAC_ADDR_BASE+(idx * sizeof(uint64_t));
2168                 __raw_writeq(reg, port);
2169                 idx++;
2170                 mclist = mclist->next;
2171         }
2172
2173         /*
2174          * Enable the "accept multicast bits" if we programmed at least one
2175          * multicast.
2176          */
2177
2178         if (idx > 1) {
2179                 reg = __raw_readq(sc->sbm_rxfilter);
2180                 reg |= M_MAC_MCAST_EN;
2181                 __raw_writeq(reg, sc->sbm_rxfilter);
2182         }
2183 }
2184
2185 #if defined(SBMAC_ETH0_HWADDR) || defined(SBMAC_ETH1_HWADDR) || defined(SBMAC_ETH2_HWADDR) || defined(SBMAC_ETH3_HWADDR)
2186 /**********************************************************************
2187  *  SBMAC_PARSE_XDIGIT(str)
2188  *
2189  *  Parse a hex digit, returning its value
2190  *
2191  *  Input parameters:
2192  *         str - character
2193  *
2194  *  Return value:
2195  *         hex value, or -1 if invalid
2196  ********************************************************************* */
2197
2198 static int sbmac_parse_xdigit(char str)
2199 {
2200         int digit;
2201
2202         if ((str >= '0') && (str <= '9'))
2203                 digit = str - '0';
2204         else if ((str >= 'a') && (str <= 'f'))
2205                 digit = str - 'a' + 10;
2206         else if ((str >= 'A') && (str <= 'F'))
2207                 digit = str - 'A' + 10;
2208         else
2209                 return -1;
2210
2211         return digit;
2212 }
2213
2214 /**********************************************************************
2215  *  SBMAC_PARSE_HWADDR(str,hwaddr)
2216  *
2217  *  Convert a string in the form xx:xx:xx:xx:xx:xx into a 6-byte
2218  *  Ethernet address.
2219  *
2220  *  Input parameters:
2221  *         str - string
2222  *         hwaddr - pointer to hardware address
2223  *
2224  *  Return value:
2225  *         0 if ok, else -1
2226  ********************************************************************* */
2227
2228 static int sbmac_parse_hwaddr(char *str, unsigned char *hwaddr)
2229 {
2230         int digit1,digit2;
2231         int idx = 6;
2232
2233         while (*str && (idx > 0)) {
2234                 digit1 = sbmac_parse_xdigit(*str);
2235                 if (digit1 < 0)
2236                         return -1;
2237                 str++;
2238                 if (!*str)
2239                         return -1;
2240
2241                 if ((*str == ':') || (*str == '-')) {
2242                         digit2 = digit1;
2243                         digit1 = 0;
2244                 }
2245                 else {
2246                         digit2 = sbmac_parse_xdigit(*str);
2247                         if (digit2 < 0)
2248                                 return -1;
2249                         str++;
2250                 }
2251
2252                 *hwaddr++ = (digit1 << 4) | digit2;
2253                 idx--;
2254
2255                 if (*str == '-')
2256                         str++;
2257                 if (*str == ':')
2258                         str++;
2259         }
2260         return 0;
2261 }
2262 #endif
2263
2264 static int sb1250_change_mtu(struct net_device *_dev, int new_mtu)
2265 {
2266         if (new_mtu >  ENET_PACKET_SIZE)
2267                 return -EINVAL;
2268         _dev->mtu = new_mtu;
2269         pr_info("changing the mtu to %d\n", new_mtu);
2270         return 0;
2271 }
2272
2273 /**********************************************************************
2274  *  SBMAC_INIT(dev)
2275  *
2276  *  Attach routine - init hardware and hook ourselves into linux
2277  *
2278  *  Input parameters:
2279  *         dev - net_device structure
2280  *
2281  *  Return value:
2282  *         status
2283  ********************************************************************* */
2284
2285 static int sbmac_init(struct platform_device *pldev, long long base)
2286 {
2287         struct net_device *dev = pldev->dev.driver_data;
2288         int idx = pldev->id;
2289         struct sbmac_softc *sc = netdev_priv(dev);
2290         unsigned char *eaddr;
2291         uint64_t ea_reg;
2292         int i;
2293         int err;
2294         DECLARE_MAC_BUF(mac);
2295
2296         sc->sbm_dev = dev;
2297         sc->sbe_idx = idx;
2298
2299         eaddr = sc->sbm_hwaddr;
2300
2301         /*
2302          * Read the ethernet address.  The firwmare left this programmed
2303          * for us in the ethernet address register for each mac.
2304          */
2305
2306         ea_reg = __raw_readq(sc->sbm_base + R_MAC_ETHERNET_ADDR);
2307         __raw_writeq(0, sc->sbm_base + R_MAC_ETHERNET_ADDR);
2308         for (i = 0; i < 6; i++) {
2309                 eaddr[i] = (uint8_t) (ea_reg & 0xFF);
2310                 ea_reg >>= 8;
2311         }
2312
2313         for (i = 0; i < 6; i++) {
2314                 dev->dev_addr[i] = eaddr[i];
2315         }
2316
2317         /*
2318          * Initialize context (get pointers to registers and stuff), then
2319          * allocate the memory for the descriptor tables.
2320          */
2321
2322         sbmac_initctx(sc);
2323
2324         /*
2325          * Set up Linux device callins
2326          */
2327
2328         spin_lock_init(&(sc->sbm_lock));
2329
2330         dev->open               = sbmac_open;
2331         dev->hard_start_xmit    = sbmac_start_tx;
2332         dev->stop               = sbmac_close;
2333         dev->set_multicast_list = sbmac_set_rx_mode;
2334         dev->do_ioctl           = sbmac_mii_ioctl;
2335         dev->tx_timeout         = sbmac_tx_timeout;
2336         dev->watchdog_timeo     = TX_TIMEOUT;
2337
2338         netif_napi_add(dev, &sc->napi, sbmac_poll, 16);
2339
2340         dev->change_mtu         = sb1250_change_mtu;
2341 #ifdef CONFIG_NET_POLL_CONTROLLER
2342         dev->poll_controller = sbmac_netpoll;
2343 #endif
2344
2345         dev->irq                = UNIT_INT(idx);
2346
2347         /* This is needed for PASS2 for Rx H/W checksum feature */
2348         sbmac_set_iphdr_offset(sc);
2349
2350         err = register_netdev(dev);
2351         if (err) {
2352                 printk(KERN_ERR "%s.%d: unable to register netdev\n",
2353                        sbmac_string, idx);
2354                 sbmac_uninitctx(sc);
2355                 return err;
2356         }
2357
2358         pr_info("%s.%d: registered as %s\n", sbmac_string, idx, dev->name);
2359
2360         if (sc->rx_hw_checksum == ENABLE)
2361                 pr_info("%s: enabling TCP rcv checksum\n", dev->name);
2362
2363         /*
2364          * Display Ethernet address (this is called during the config
2365          * process so we need to finish off the config message that
2366          * was being displayed)
2367          */
2368         pr_info("%s: SiByte Ethernet at 0x%08Lx, address: %s\n",
2369                dev->name, base, print_mac(mac, eaddr));
2370
2371         sc->mii_bus.name = sbmac_mdio_string;
2372         snprintf(sc->mii_bus.id, MII_BUS_ID_SIZE, "%x", idx);
2373         sc->mii_bus.priv = sc;
2374         sc->mii_bus.read = sbmac_mii_read;
2375         sc->mii_bus.write = sbmac_mii_write;
2376         sc->mii_bus.irq = sc->phy_irq;
2377         for (i = 0; i < PHY_MAX_ADDR; ++i)
2378                 sc->mii_bus.irq[i] = SBMAC_PHY_INT;
2379
2380         sc->mii_bus.dev = &pldev->dev;
2381         dev_set_drvdata(&pldev->dev, &sc->mii_bus);
2382
2383         return 0;
2384 }
2385
2386
2387 static int sbmac_open(struct net_device *dev)
2388 {
2389         struct sbmac_softc *sc = netdev_priv(dev);
2390         int err;
2391
2392         if (debug > 1)
2393                 pr_debug("%s: sbmac_open() irq %d.\n", dev->name, dev->irq);
2394
2395         /*
2396          * map/route interrupt (clear status first, in case something
2397          * weird is pending; we haven't initialized the mac registers
2398          * yet)
2399          */
2400
2401         __raw_readq(sc->sbm_isr);
2402         err = request_irq(dev->irq, &sbmac_intr, IRQF_SHARED, dev->name, dev);
2403         if (err) {
2404                 printk(KERN_ERR "%s: unable to get IRQ %d\n", dev->name,
2405                        dev->irq);
2406                 goto out_err;
2407         }
2408
2409         /*
2410          * Probe PHY address
2411          */
2412         err = mdiobus_register(&sc->mii_bus);
2413         if (err) {
2414                 printk(KERN_ERR "%s: unable to register MDIO bus\n",
2415                        dev->name);
2416                 goto out_unirq;
2417         }
2418
2419         sc->sbm_speed = sbmac_speed_none;
2420         sc->sbm_duplex = sbmac_duplex_none;
2421         sc->sbm_fc = sbmac_fc_none;
2422         sc->sbm_pause = -1;
2423         sc->sbm_link = 0;
2424
2425         /*
2426          * Attach to the PHY
2427          */
2428         err = sbmac_mii_probe(dev);
2429         if (err)
2430                 goto out_unregister;
2431
2432         /*
2433          * Turn on the channel
2434          */
2435
2436         sbmac_set_channel_state(sc,sbmac_state_on);
2437
2438         netif_start_queue(dev);
2439
2440         sbmac_set_rx_mode(dev);
2441
2442         phy_start(sc->phy_dev);
2443
2444         napi_enable(&sc->napi);
2445
2446         return 0;
2447
2448 out_unregister:
2449         mdiobus_unregister(&sc->mii_bus);
2450
2451 out_unirq:
2452         free_irq(dev->irq, dev);
2453
2454 out_err:
2455         return err;
2456 }
2457
2458 static int sbmac_mii_probe(struct net_device *dev)
2459 {
2460         struct sbmac_softc *sc = netdev_priv(dev);
2461         struct phy_device *phy_dev;
2462         int i;
2463
2464         for (i = 0; i < PHY_MAX_ADDR; i++) {
2465                 phy_dev = sc->mii_bus.phy_map[i];
2466                 if (phy_dev)
2467                         break;
2468         }
2469         if (!phy_dev) {
2470                 printk(KERN_ERR "%s: no PHY found\n", dev->name);
2471                 return -ENXIO;
2472         }
2473
2474         phy_dev = phy_connect(dev, phy_dev->dev.bus_id, &sbmac_mii_poll, 0,
2475                               PHY_INTERFACE_MODE_GMII);
2476         if (IS_ERR(phy_dev)) {
2477                 printk(KERN_ERR "%s: could not attach to PHY\n", dev->name);
2478                 return PTR_ERR(phy_dev);
2479         }
2480
2481         /* Remove any features not supported by the controller */
2482         phy_dev->supported &= SUPPORTED_10baseT_Half |
2483                               SUPPORTED_10baseT_Full |
2484                               SUPPORTED_100baseT_Half |
2485                               SUPPORTED_100baseT_Full |
2486                               SUPPORTED_1000baseT_Half |
2487                               SUPPORTED_1000baseT_Full |
2488                               SUPPORTED_Autoneg |
2489                               SUPPORTED_MII |
2490                               SUPPORTED_Pause |
2491                               SUPPORTED_Asym_Pause;
2492         phy_dev->advertising = phy_dev->supported;
2493
2494         pr_info("%s: attached PHY driver [%s] (mii_bus:phy_addr=%s, irq=%d)\n",
2495                 dev->name, phy_dev->drv->name,
2496                 phy_dev->dev.bus_id, phy_dev->irq);
2497
2498         sc->phy_dev = phy_dev;
2499
2500         return 0;
2501 }
2502
2503
2504 static void sbmac_mii_poll(struct net_device *dev)
2505 {
2506         struct sbmac_softc *sc = netdev_priv(dev);
2507         struct phy_device *phy_dev = sc->phy_dev;
2508         unsigned long flags;
2509         enum sbmac_fc fc;
2510         int link_chg, speed_chg, duplex_chg, pause_chg, fc_chg;
2511
2512         link_chg = (sc->sbm_link != phy_dev->link);
2513         speed_chg = (sc->sbm_speed != phy_dev->speed);
2514         duplex_chg = (sc->sbm_duplex != phy_dev->duplex);
2515         pause_chg = (sc->sbm_pause != phy_dev->pause);
2516
2517         if (!link_chg && !speed_chg && !duplex_chg && !pause_chg)
2518                 return;                                 /* Hmmm... */
2519
2520         if (!phy_dev->link) {
2521                 if (link_chg) {
2522                         sc->sbm_link = phy_dev->link;
2523                         sc->sbm_speed = sbmac_speed_none;
2524                         sc->sbm_duplex = sbmac_duplex_none;
2525                         sc->sbm_fc = sbmac_fc_disabled;
2526                         sc->sbm_pause = -1;
2527                         pr_info("%s: link unavailable\n", dev->name);
2528                 }
2529                 return;
2530         }
2531
2532         if (phy_dev->duplex == DUPLEX_FULL) {
2533                 if (phy_dev->pause)
2534                         fc = sbmac_fc_frame;
2535                 else
2536                         fc = sbmac_fc_disabled;
2537         } else
2538                 fc = sbmac_fc_collision;
2539         fc_chg = (sc->sbm_fc != fc);
2540
2541         pr_info("%s: link available: %dbase-%cD\n", dev->name, phy_dev->speed,
2542                 phy_dev->duplex == DUPLEX_FULL ? 'F' : 'H');
2543
2544         spin_lock_irqsave(&sc->sbm_lock, flags);
2545
2546         sc->sbm_speed = phy_dev->speed;
2547         sc->sbm_duplex = phy_dev->duplex;
2548         sc->sbm_fc = fc;
2549         sc->sbm_pause = phy_dev->pause;
2550         sc->sbm_link = phy_dev->link;
2551
2552         if ((speed_chg || duplex_chg || fc_chg) &&
2553             sc->sbm_state != sbmac_state_off) {
2554                 /*
2555                  * something changed, restart the channel
2556                  */
2557                 if (debug > 1)
2558                         pr_debug("%s: restarting channel "
2559                                  "because PHY state changed\n", dev->name);
2560                 sbmac_channel_stop(sc);
2561                 sbmac_channel_start(sc);
2562         }
2563
2564         spin_unlock_irqrestore(&sc->sbm_lock, flags);
2565 }
2566
2567
2568 static void sbmac_tx_timeout (struct net_device *dev)
2569 {
2570         struct sbmac_softc *sc = netdev_priv(dev);
2571
2572         spin_lock_irq (&sc->sbm_lock);
2573
2574
2575         dev->trans_start = jiffies;
2576         dev->stats.tx_errors++;
2577
2578         spin_unlock_irq (&sc->sbm_lock);
2579
2580         printk (KERN_WARNING "%s: Transmit timed out\n",dev->name);
2581 }
2582
2583
2584
2585
2586 static void sbmac_set_rx_mode(struct net_device *dev)
2587 {
2588         unsigned long flags;
2589         struct sbmac_softc *sc = netdev_priv(dev);
2590
2591         spin_lock_irqsave(&sc->sbm_lock, flags);
2592         if ((dev->flags ^ sc->sbm_devflags) & IFF_PROMISC) {
2593                 /*
2594                  * Promiscuous changed.
2595                  */
2596
2597                 if (dev->flags & IFF_PROMISC) {
2598                         sbmac_promiscuous_mode(sc,1);
2599                 }
2600                 else {
2601                         sbmac_promiscuous_mode(sc,0);
2602                 }
2603         }
2604         spin_unlock_irqrestore(&sc->sbm_lock, flags);
2605
2606         /*
2607          * Program the multicasts.  Do this every time.
2608          */
2609
2610         sbmac_setmulti(sc);
2611
2612 }
2613
2614 static int sbmac_mii_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
2615 {
2616         struct sbmac_softc *sc = netdev_priv(dev);
2617
2618         if (!netif_running(dev) || !sc->phy_dev)
2619                 return -EINVAL;
2620
2621         return phy_mii_ioctl(sc->phy_dev, if_mii(rq), cmd);
2622 }
2623
2624 static int sbmac_close(struct net_device *dev)
2625 {
2626         struct sbmac_softc *sc = netdev_priv(dev);
2627
2628         napi_disable(&sc->napi);
2629
2630         phy_stop(sc->phy_dev);
2631
2632         sbmac_set_channel_state(sc, sbmac_state_off);
2633
2634         netif_stop_queue(dev);
2635
2636         if (debug > 1)
2637                 pr_debug("%s: Shutting down ethercard\n", dev->name);
2638
2639         phy_disconnect(sc->phy_dev);
2640         sc->phy_dev = NULL;
2641
2642         mdiobus_unregister(&sc->mii_bus);
2643
2644         free_irq(dev->irq, dev);
2645
2646         sbdma_emptyring(&(sc->sbm_txdma));
2647         sbdma_emptyring(&(sc->sbm_rxdma));
2648
2649         return 0;
2650 }
2651
2652 static int sbmac_poll(struct napi_struct *napi, int budget)
2653 {
2654         struct sbmac_softc *sc = container_of(napi, struct sbmac_softc, napi);
2655         struct net_device *dev = sc->sbm_dev;
2656         int work_done;
2657
2658         work_done = sbdma_rx_process(sc, &(sc->sbm_rxdma), budget, 1);
2659         sbdma_tx_process(sc, &(sc->sbm_txdma), 1);
2660
2661         if (work_done < budget) {
2662                 netif_rx_complete(dev, napi);
2663
2664 #ifdef CONFIG_SBMAC_COALESCE
2665                 __raw_writeq(((M_MAC_INT_EOP_COUNT | M_MAC_INT_EOP_TIMER) << S_MAC_TX_CH0) |
2666                              ((M_MAC_INT_EOP_COUNT | M_MAC_INT_EOP_TIMER) << S_MAC_RX_CH0),
2667                              sc->sbm_imr);
2668 #else
2669                 __raw_writeq((M_MAC_INT_CHANNEL << S_MAC_TX_CH0) |
2670                              (M_MAC_INT_CHANNEL << S_MAC_RX_CH0), sc->sbm_imr);
2671 #endif
2672         }
2673
2674         return work_done;
2675 }
2676
2677
2678 static int __init sbmac_probe(struct platform_device *pldev)
2679 {
2680         struct net_device *dev;
2681         struct sbmac_softc *sc;
2682         void __iomem *sbm_base;
2683         struct resource *res;
2684         u64 sbmac_orig_hwaddr;
2685         int err;
2686
2687         res = platform_get_resource(pldev, IORESOURCE_MEM, 0);
2688         BUG_ON(!res);
2689         sbm_base = ioremap_nocache(res->start, res->end - res->start + 1);
2690         if (!sbm_base) {
2691                 printk(KERN_ERR "%s: unable to map device registers\n",
2692                        pldev->dev.bus_id);
2693                 err = -ENOMEM;
2694                 goto out_out;
2695         }
2696
2697         /*
2698          * The R_MAC_ETHERNET_ADDR register will be set to some nonzero
2699          * value for us by the firmware if we're going to use this MAC.
2700          * If we find a zero, skip this MAC.
2701          */
2702         sbmac_orig_hwaddr = __raw_readq(sbm_base + R_MAC_ETHERNET_ADDR);
2703         pr_debug("%s: %sconfiguring MAC at 0x%08Lx\n", pldev->dev.bus_id,
2704                  sbmac_orig_hwaddr ? "" : "not ", (long long)res->start);
2705         if (sbmac_orig_hwaddr == 0) {
2706                 err = 0;
2707                 goto out_unmap;
2708         }
2709
2710         /*
2711          * Okay, cool.  Initialize this MAC.
2712          */
2713         dev = alloc_etherdev(sizeof(struct sbmac_softc));
2714         if (!dev) {
2715                 printk(KERN_ERR "%s: unable to allocate etherdev\n",
2716                        pldev->dev.bus_id);
2717                 err = -ENOMEM;
2718                 goto out_unmap;
2719         }
2720
2721         pldev->dev.driver_data = dev;
2722         SET_NETDEV_DEV(dev, &pldev->dev);
2723
2724         sc = netdev_priv(dev);
2725         sc->sbm_base = sbm_base;
2726
2727         err = sbmac_init(pldev, res->start);
2728         if (err)
2729                 goto out_kfree;
2730
2731         return 0;
2732
2733 out_kfree:
2734         free_netdev(dev);
2735         __raw_writeq(sbmac_orig_hwaddr, sbm_base + R_MAC_ETHERNET_ADDR);
2736
2737 out_unmap:
2738         iounmap(sbm_base);
2739
2740 out_out:
2741         return err;
2742 }
2743
2744 static int __exit sbmac_remove(struct platform_device *pldev)
2745 {
2746         struct net_device *dev = pldev->dev.driver_data;
2747         struct sbmac_softc *sc = netdev_priv(dev);
2748
2749         unregister_netdev(dev);
2750         sbmac_uninitctx(sc);
2751         iounmap(sc->sbm_base);
2752         free_netdev(dev);
2753
2754         return 0;
2755 }
2756
2757
2758 static struct platform_device **sbmac_pldev;
2759 static int sbmac_max_units;
2760
2761 #if defined(SBMAC_ETH0_HWADDR) || defined(SBMAC_ETH1_HWADDR) || defined(SBMAC_ETH2_HWADDR) || defined(SBMAC_ETH3_HWADDR)
2762 static void __init sbmac_setup_hwaddr(int idx, char *addr)
2763 {
2764         void __iomem *sbm_base;
2765         unsigned long start, end;
2766         uint8_t eaddr[6];
2767         uint64_t val;
2768
2769         if (idx >= sbmac_max_units)
2770                 return;
2771
2772         start = A_MAC_CHANNEL_BASE(idx);
2773         end = A_MAC_CHANNEL_BASE(idx + 1) - 1;
2774
2775         sbm_base = ioremap_nocache(start, end - start + 1);
2776         if (!sbm_base) {
2777                 printk(KERN_ERR "%s: unable to map device registers\n",
2778                        sbmac_string);
2779                 return;
2780         }
2781
2782         sbmac_parse_hwaddr(addr, eaddr);
2783         val = sbmac_addr2reg(eaddr);
2784         __raw_writeq(val, sbm_base + R_MAC_ETHERNET_ADDR);
2785         val = __raw_readq(sbm_base + R_MAC_ETHERNET_ADDR);
2786
2787         iounmap(sbm_base);
2788 }
2789 #endif
2790
2791 static int __init sbmac_platform_probe_one(int idx)
2792 {
2793         struct platform_device *pldev;
2794         struct {
2795                 struct resource r;
2796                 char name[strlen(sbmac_pretty) + 4];
2797         } *res;
2798         int err;
2799
2800         res = kzalloc(sizeof(*res), GFP_KERNEL);
2801         if (!res) {
2802                 printk(KERN_ERR "%s.%d: unable to allocate memory\n",
2803                        sbmac_string, idx);
2804                 err = -ENOMEM;
2805                 goto out_err;
2806         }
2807
2808         /*
2809          * This is the base address of the MAC.
2810          */
2811         snprintf(res->name, sizeof(res->name), "%s %d", sbmac_pretty, idx);
2812         res->r.name = res->name;
2813         res->r.flags = IORESOURCE_MEM;
2814         res->r.start = A_MAC_CHANNEL_BASE(idx);
2815         res->r.end = A_MAC_CHANNEL_BASE(idx + 1) - 1;
2816
2817         pldev = platform_device_register_simple(sbmac_string, idx, &res->r, 1);
2818         if (IS_ERR(pldev)) {
2819                 printk(KERN_ERR "%s.%d: unable to register platform device\n",
2820                        sbmac_string, idx);
2821                 err = PTR_ERR(pldev);
2822                 goto out_kfree;
2823         }
2824
2825         if (!pldev->dev.driver) {
2826                 err = 0;                /* No hardware at this address. */
2827                 goto out_unregister;
2828         }
2829
2830         sbmac_pldev[idx] = pldev;
2831         return 0;
2832
2833 out_unregister:
2834         platform_device_unregister(pldev);
2835
2836 out_kfree:
2837         kfree(res);
2838
2839 out_err:
2840         return err;
2841 }
2842
2843 static void __init sbmac_platform_probe(void)
2844 {
2845         int i;
2846
2847         /* Set the number of available units based on the SOC type.  */
2848         switch (soc_type) {
2849         case K_SYS_SOC_TYPE_BCM1250:
2850         case K_SYS_SOC_TYPE_BCM1250_ALT:
2851                 sbmac_max_units = 3;
2852                 break;
2853         case K_SYS_SOC_TYPE_BCM1120:
2854         case K_SYS_SOC_TYPE_BCM1125:
2855         case K_SYS_SOC_TYPE_BCM1125H:
2856         case K_SYS_SOC_TYPE_BCM1250_ALT2:       /* Hybrid */
2857                 sbmac_max_units = 2;
2858                 break;
2859         case K_SYS_SOC_TYPE_BCM1x55:
2860         case K_SYS_SOC_TYPE_BCM1x80:
2861                 sbmac_max_units = 4;
2862                 break;
2863         default:
2864                 return;                         /* none */
2865         }
2866
2867         /*
2868          * For bringup when not using the firmware, we can pre-fill
2869          * the MAC addresses using the environment variables
2870          * specified in this file (or maybe from the config file?)
2871          */
2872 #ifdef SBMAC_ETH0_HWADDR
2873         sbmac_setup_hwaddr(0, SBMAC_ETH0_HWADDR);
2874 #endif
2875 #ifdef SBMAC_ETH1_HWADDR
2876         sbmac_setup_hwaddr(1, SBMAC_ETH1_HWADDR);
2877 #endif
2878 #ifdef SBMAC_ETH2_HWADDR
2879         sbmac_setup_hwaddr(2, SBMAC_ETH2_HWADDR);
2880 #endif
2881 #ifdef SBMAC_ETH3_HWADDR
2882         sbmac_setup_hwaddr(3, SBMAC_ETH3_HWADDR);
2883 #endif
2884
2885         sbmac_pldev = kcalloc(sbmac_max_units, sizeof(*sbmac_pldev),
2886                               GFP_KERNEL);
2887         if (!sbmac_pldev) {
2888                 printk(KERN_ERR "%s: unable to allocate memory\n",
2889                        sbmac_string);
2890                 return;
2891         }
2892
2893         /*
2894          * Walk through the Ethernet controllers and find
2895          * those who have their MAC addresses set.
2896          */
2897         for (i = 0; i < sbmac_max_units; i++)
2898                 if (sbmac_platform_probe_one(i))
2899                         break;
2900 }
2901
2902
2903 static void __exit sbmac_platform_cleanup(void)
2904 {
2905         int i;
2906
2907         for (i = 0; i < sbmac_max_units; i++)
2908                 platform_device_unregister(sbmac_pldev[i]);
2909         kfree(sbmac_pldev);
2910 }
2911
2912
2913 static struct platform_driver sbmac_driver = {
2914         .probe = sbmac_probe,
2915         .remove = __exit_p(sbmac_remove),
2916         .driver = {
2917                 .name = sbmac_string,
2918         },
2919 };
2920
2921 static int __init sbmac_init_module(void)
2922 {
2923         int err;
2924
2925         err = platform_driver_register(&sbmac_driver);
2926         if (err)
2927                 return err;
2928
2929         sbmac_platform_probe();
2930
2931         return err;
2932 }
2933
2934 static void __exit sbmac_cleanup_module(void)
2935 {
2936         sbmac_platform_cleanup();
2937         platform_driver_unregister(&sbmac_driver);
2938 }
2939
2940 module_init(sbmac_init_module);
2941 module_exit(sbmac_cleanup_module);