drivers/net/ibm_newemac/core.h

   1 /*
   2  * drivers/net/ibm_newemac/core.h
   3  *
   4  * Driver for PowerPC 4xx on-chip ethernet controller.
   5  *
   6  * Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
   7  *                <benh@kernel.crashing.org>
   8  *
   9  * Based on the arch/ppc version of the driver:
  10  *
  11  * Copyright (c) 2004, 2005 Zultys Technologies.
  12  * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
  13  *
  14  * Based on original work by
  15  *      Armin Kuster <akuster@mvista.com>
  16  *      Johnnie Peters <jpeters@mvista.com>
  17  *      Copyright 2000, 2001 MontaVista Softare Inc.
  18  *
  19  * This program is free software; you can redistribute  it and/or modify it
  20  * under  the terms of  the GNU General  Public License as published by the
  21  * Free Software Foundation;  either version 2 of the  License, or (at your
  22  * option) any later version.
  23  *
  24  */
  25 #ifndef __IBM_NEWEMAC_CORE_H
  26 #define __IBM_NEWEMAC_CORE_H
  27
  28 #include <linux/module.h>
  29 #include <linux/init.h>
  30 #include <linux/list.h>
  31 #include <linux/kernel.h>
  32 #include <linux/interrupt.h>
  33 #include <linux/netdevice.h>
  34 #include <linux/dma-mapping.h>
  35 #include <linux/spinlock.h>
  36 #include <linux/of_platform.h>
  37
  38 #include <asm/io.h>
  39 #include <asm/dcr.h>
  40
  41 #include "emac.h"
  42 #include "phy.h"
  43 #include "zmii.h"
  44 #include "rgmii.h"
  45 #include "mal.h"
  46 #include "tah.h"
  47 #include "debug.h"
  48
  49 #define NUM_TX_BUFF                     CONFIG_IBM_NEW_EMAC_TXB
  50 #define NUM_RX_BUFF                     CONFIG_IBM_NEW_EMAC_RXB
  51
  52 /* Simple sanity check */
  53 #if NUM_TX_BUFF > 256 || NUM_RX_BUFF > 256
  54 #error Invalid number of buffer descriptors (greater than 256)
  55 #endif
  56
  57 #define EMAC_MIN_MTU                    46
  58
  59 /* Maximum L2 header length (VLAN tagged, no FCS) */
  60 #define EMAC_MTU_OVERHEAD               (6 * 2 + 2 + 4)
  61
  62 /* RX BD size for the given MTU */
  63 static inline int emac_rx_size(int mtu)
  64 {
  65         if (mtu > ETH_DATA_LEN)
  66                 return MAL_MAX_RX_SIZE;
  67         else
  68                 return mal_rx_size(ETH_DATA_LEN + EMAC_MTU_OVERHEAD);
  69 }
  70
  71 #define EMAC_DMA_ALIGN(x)               ALIGN((x), dma_get_cache_alignment())
  72
  73 #define EMAC_RX_SKB_HEADROOM            \
  74         EMAC_DMA_ALIGN(CONFIG_IBM_NEW_EMAC_RX_SKB_HEADROOM)
  75
  76 /* Size of RX skb for the given MTU */
  77 static inline int emac_rx_skb_size(int mtu)
  78 {
  79         int size = max(mtu + EMAC_MTU_OVERHEAD, emac_rx_size(mtu));
  80         return EMAC_DMA_ALIGN(size + 2) + EMAC_RX_SKB_HEADROOM;
  81 }
  82
  83 /* RX DMA sync size */
  84 static inline int emac_rx_sync_size(int mtu)
  85 {
  86         return EMAC_DMA_ALIGN(emac_rx_size(mtu) + 2);
  87 }
  88
  89 /* Driver statistcs is split into two parts to make it more cache friendly:
  90  *   - normal statistics (packet count, etc)
  91  *   - error statistics
  92  *
  93  * When statistics is requested by ethtool, these parts are concatenated,
  94  * normal one goes first.
  95  *
  96  * Please, keep these structures in sync with emac_stats_keys.
  97  */
  98
  99 /* Normal TX/RX Statistics */
 100 struct emac_stats {
 101         u64 rx_packets;
 102         u64 rx_bytes;
 103         u64 tx_packets;
 104         u64 tx_bytes;
 105         u64 rx_packets_csum;
 106         u64 tx_packets_csum;
 107 };
 108
 109 /* Error statistics */
 110 struct emac_error_stats {
 111         u64 tx_undo;
 112
 113         /* Software RX Errors */
 114         u64 rx_dropped_stack;
 115         u64 rx_dropped_oom;
 116         u64 rx_dropped_error;
 117         u64 rx_dropped_resize;
 118         u64 rx_dropped_mtu;
 119         u64 rx_stopped;
 120         /* BD reported RX errors */
 121         u64 rx_bd_errors;
 122         u64 rx_bd_overrun;
 123         u64 rx_bd_bad_packet;
 124         u64 rx_bd_runt_packet;
 125         u64 rx_bd_short_event;
 126         u64 rx_bd_alignment_error;
 127         u64 rx_bd_bad_fcs;
 128         u64 rx_bd_packet_too_long;
 129         u64 rx_bd_out_of_range;
 130         u64 rx_bd_in_range;
 131         /* EMAC IRQ reported RX errors */
 132         u64 rx_parity;
 133         u64 rx_fifo_overrun;
 134         u64 rx_overrun;
 135         u64 rx_bad_packet;
 136         u64 rx_runt_packet;
 137         u64 rx_short_event;
 138         u64 rx_alignment_error;
 139         u64 rx_bad_fcs;
 140         u64 rx_packet_too_long;
 141         u64 rx_out_of_range;
 142         u64 rx_in_range;
 143
 144         /* Software TX Errors */
 145         u64 tx_dropped;
 146         /* BD reported TX errors */
 147         u64 tx_bd_errors;
 148         u64 tx_bd_bad_fcs;
 149         u64 tx_bd_carrier_loss;
 150         u64 tx_bd_excessive_deferral;
 151         u64 tx_bd_excessive_collisions;
 152         u64 tx_bd_late_collision;
 153         u64 tx_bd_multple_collisions;
 154         u64 tx_bd_single_collision;
 155         u64 tx_bd_underrun;
 156         u64 tx_bd_sqe;
 157         /* EMAC IRQ reported TX errors */
 158         u64 tx_parity;
 159         u64 tx_underrun;
 160         u64 tx_sqe;
 161         u64 tx_errors;
 162 };
 163
 164 #define EMAC_ETHTOOL_STATS_COUNT        ((sizeof(struct emac_stats) + \
 165                                           sizeof(struct emac_error_stats)) \
 166                                          / sizeof(u64))
 167
 168 struct emac_instance {
 169         struct net_device               *ndev;
 170         struct resource                 rsrc_regs;
 171         struct emac_regs                __iomem *emacp;
 172         struct of_device                *ofdev;
 173         struct device_node              **blist; /* bootlist entry */
 174
 175         /* MAL linkage */
 176         u32                             mal_ph;
 177         struct of_device                *mal_dev;
 178         u32                             mal_rx_chan;
 179         u32                             mal_tx_chan;
 180         struct mal_instance             *mal;
 181         struct mal_commac               commac;
 182
 183         /* PHY infos */
 184         u32                             phy_mode;
 185         u32                             phy_map;
 186         u32                             phy_address;
 187         u32                             phy_feat_exc;
 188         struct mii_phy                  phy;
 189         struct mutex                    link_lock;
 190         struct delayed_work             link_work;
 191         int                             link_polling;
 192
 193         /* GPCS PHY infos */
 194         u32                             gpcs_address;
 195
 196         /* Shared MDIO if any */
 197         u32                             mdio_ph;
 198         struct of_device                *mdio_dev;
 199         struct emac_instance            *mdio_instance;
 200         struct mutex                    mdio_lock;
 201
 202         /* ZMII infos if any */
 203         u32                             zmii_ph;
 204         u32                             zmii_port;
 205         struct of_device                *zmii_dev;
 206
 207         /* RGMII infos if any */
 208         u32                             rgmii_ph;
 209         u32                             rgmii_port;
 210         struct of_device                *rgmii_dev;
 211
 212         /* TAH infos if any */
 213         u32                             tah_ph;
 214         u32                             tah_port;
 215         struct of_device                *tah_dev;
 216
 217         /* IRQs */
 218         int                             wol_irq;
 219         int                             emac_irq;
 220
 221         /* OPB bus frequency in Mhz */
 222         u32                             opb_bus_freq;
 223
 224         /* Cell index within an ASIC (for clk mgmnt) */
 225         u32                             cell_index;
 226
 227         /* Max supported MTU */
 228         u32                             max_mtu;
 229
 230         /* Feature bits (from probe table) */
 231         unsigned int                    features;
 232
 233         /* Tx and Rx fifo sizes & other infos in bytes */
 234         u32                             tx_fifo_size;
 235         u32                             tx_fifo_size_gige;
 236         u32                             rx_fifo_size;
 237         u32                             rx_fifo_size_gige;
 238         u32                             fifo_entry_size;
 239         u32                             mal_burst_size; /* move to MAL ? */
 240
 241         /* IAHT and GAHT filter parameterization */
 242         u32                             xaht_slots_shift;
 243         u32                             xaht_width_shift;
 244
 245         /* Descriptor management
 246          */
 247         struct mal_descriptor           *tx_desc;
 248         int                             tx_cnt;
 249         int                             tx_slot;
 250         int                             ack_slot;
 251
 252         struct mal_descriptor           *rx_desc;
 253         int                             rx_slot;
 254         struct sk_buff                  *rx_sg_skb;     /* 1 */
 255         int                             rx_skb_size;
 256         int                             rx_sync_size;
 257
 258         struct sk_buff                  *tx_skb[NUM_TX_BUFF];
 259         struct sk_buff                  *rx_skb[NUM_RX_BUFF];
 260
 261         /* Stats
 262          */
 263         struct emac_error_stats         estats;
 264         struct net_device_stats         nstats;
 265         struct emac_stats               stats;
 266
 267         /* Misc
 268          */
 269         int                             reset_failed;
 270         int                             stop_timeout;   /* in us */
 271         int                             no_mcast;
 272         int                             mcast_pending;
 273         int                             opened;
 274         struct work_struct              reset_work;
 275         spinlock_t                      lock;
 276 };
 277
 278 /*
 279  * Features of various EMAC implementations
 280  */
 281
 282 /*
 283  * No flow control on 40x according to the original driver
 284  */
 285 #define EMAC_FTR_NO_FLOW_CONTROL_40x    0x00000001
 286 /*
 287  * Cell is an EMAC4
 288  */
 289 #define EMAC_FTR_EMAC4                  0x00000002
 290 /*
 291  * For the 440SPe, AMCC inexplicably changed the polarity of
 292  * the "operation complete" bit in the MII control register.
 293  */
 294 #define EMAC_FTR_STACR_OC_INVERT        0x00000004
 295 /*
 296  * Set if we have a TAH.
 297  */
 298 #define EMAC_FTR_HAS_TAH                0x00000008
 299 /*
 300  * Set if we have a ZMII.
 301  */
 302 #define EMAC_FTR_HAS_ZMII               0x00000010
 303 /*
 304  * Set if we have a RGMII.
 305  */
 306 #define EMAC_FTR_HAS_RGMII              0x00000020
 307 /*
 308  * Set if we have new type STACR with STAOPC
 309  */
 310 #define EMAC_FTR_HAS_NEW_STACR          0x00000040
 311 /*
 312  * Set if we need phy clock workaround for 440gx
 313  */
 314 #define EMAC_FTR_440GX_PHY_CLK_FIX      0x00000080
 315 /*
 316  * Set if we need phy clock workaround for 440ep or 440gr
 317  */
 318 #define EMAC_FTR_440EP_PHY_CLK_FIX      0x00000100
 319 /*
 320  * The 405EX and 460EX contain the EMAC4SYNC core
 321  */
 322 #define EMAC_FTR_EMAC4SYNC              0x00000200
 323 /*
 324  * Set if we need phy clock workaround for 460ex or 460gt
 325  */
 326 #define EMAC_FTR_460EX_PHY_CLK_FIX      0x00000400
 327
 328
 329 /* Right now, we don't quite handle the always/possible masks on the
 330  * most optimal way as we don't have a way to say something like
 331  * always EMAC4. Patches welcome.
 332  */
 333 enum {
 334         EMAC_FTRS_ALWAYS        = 0,
 335
 336         EMAC_FTRS_POSSIBLE      =
 337 #ifdef CONFIG_IBM_NEW_EMAC_EMAC4
 338             EMAC_FTR_EMAC4      | EMAC_FTR_EMAC4SYNC    |
 339             EMAC_FTR_HAS_NEW_STACR      |
 340             EMAC_FTR_STACR_OC_INVERT | EMAC_FTR_440GX_PHY_CLK_FIX |
 341 #endif
 342 #ifdef CONFIG_IBM_NEW_EMAC_TAH
 343             EMAC_FTR_HAS_TAH    |
 344 #endif
 345 #ifdef CONFIG_IBM_NEW_EMAC_ZMII
 346             EMAC_FTR_HAS_ZMII   |
 347 #endif
 348 #ifdef CONFIG_IBM_NEW_EMAC_RGMII
 349             EMAC_FTR_HAS_RGMII  |
 350 #endif
 351 #ifdef CONFIG_IBM_NEW_EMAC_NO_FLOW_CTRL
 352             EMAC_FTR_NO_FLOW_CONTROL_40x |
 353 #endif
 354         EMAC_FTR_460EX_PHY_CLK_FIX |
 355         EMAC_FTR_440EP_PHY_CLK_FIX,
 356 };
 357
 358 static inline int emac_has_feature(struct emac_instance *dev,
 359                                    unsigned long feature)
 360 {
 361         return (EMAC_FTRS_ALWAYS & feature) ||
 362                (EMAC_FTRS_POSSIBLE & dev->features & feature);
 363 }
 364
 365 /*
 366  * Various instances of the EMAC core have varying 1) number of
 367  * address match slots, 2) width of the registers for handling address
 368  * match slots, 3) number of registers for handling address match
 369  * slots and 4) base offset for those registers.
 370  *
 371  * These macros and inlines handle these differences based on
 372  * parameters supplied by the device structure which are, in turn,
 373  * initialized based on the "compatible" entry in the device tree.
 374  */
 375
 376 #define EMAC4_XAHT_SLOTS_SHIFT          6
 377 #define EMAC4_XAHT_WIDTH_SHIFT          4
 378
 379 #define EMAC4SYNC_XAHT_SLOTS_SHIFT      8
 380 #define EMAC4SYNC_XAHT_WIDTH_SHIFT      5
 381
 382 #define EMAC_XAHT_SLOTS(dev)            (1 << (dev)->xaht_slots_shift)
 383 #define EMAC_XAHT_WIDTH(dev)            (1 << (dev)->xaht_width_shift)
 384 #define EMAC_XAHT_REGS(dev)             (1 << ((dev)->xaht_slots_shift - \
 385                                                (dev)->xaht_width_shift))
 386
 387 #define EMAC_XAHT_CRC_TO_SLOT(dev, crc)                 \
 388         ((EMAC_XAHT_SLOTS(dev) - 1) -                   \
 389          ((crc) >> ((sizeof (u32) * BITS_PER_BYTE) -    \
 390                     (dev)->xaht_slots_shift)))
 391
 392 #define EMAC_XAHT_SLOT_TO_REG(dev, slot)                \
 393         ((slot) >> (dev)->xaht_width_shift)
 394
 395 #define EMAC_XAHT_SLOT_TO_MASK(dev, slot)               \
 396         ((u32)(1 << (EMAC_XAHT_WIDTH(dev) - 1)) >>      \
 397          ((slot) & (u32)(EMAC_XAHT_WIDTH(dev) - 1)))
 398
 399 static inline u32 *emac_xaht_base(struct emac_instance *dev)
 400 {
 401         struct emac_regs __iomem *p = dev->emacp;
 402         int offset;
 403
 404         /* The first IAHT entry always is the base of the block of
 405          * IAHT and GAHT registers.
 406          */
 407         if (emac_has_feature(dev, EMAC_FTR_EMAC4SYNC))
 408                 offset = offsetof(struct emac_regs, u1.emac4sync.iaht1);
 409         else
 410                 offset = offsetof(struct emac_regs, u0.emac4.iaht1);
 411
 412         return ((u32 *)((ptrdiff_t)p + offset));
 413 }
 414
 415 static inline u32 *emac_gaht_base(struct emac_instance *dev)
 416 {
 417         /* GAHT registers always come after an identical number of
 418          * IAHT registers.
 419          */
 420         return (emac_xaht_base(dev) + EMAC_XAHT_REGS(dev));
 421 }
 422
 423 static inline u32 *emac_iaht_base(struct emac_instance *dev)
 424 {
 425         /* IAHT registers always come before an identical number of
 426          * GAHT registers.
 427          */
 428         return (emac_xaht_base(dev));
 429 }
 430
 431 /* Ethtool get_regs complex data.
 432  * We want to get not just EMAC registers, but also MAL, ZMII, RGMII, TAH
 433  * when available.
 434  *
 435  * Returned BLOB consists of the ibm_emac_ethtool_regs_hdr,
 436  * MAL registers, EMAC registers and optional ZMII, RGMII, TAH registers.
 437  * Each register component is preceded with emac_ethtool_regs_subhdr.
 438  * Order of the optional headers follows their relative bit posititions
 439  * in emac_ethtool_regs_hdr.components
 440  */
 441 #define EMAC_ETHTOOL_REGS_ZMII          0x00000001
 442 #define EMAC_ETHTOOL_REGS_RGMII         0x00000002
 443 #define EMAC_ETHTOOL_REGS_TAH           0x00000004
 444
 445 struct emac_ethtool_regs_hdr {
 446         u32 components;
 447 };
 448
 449 struct emac_ethtool_regs_subhdr {
 450         u32 version;
 451         u32 index;
 452 };
 453
 454 #define EMAC_ETHTOOL_REGS_VER           0
 455 #define EMAC_ETHTOOL_REGS_SIZE(dev)     ((dev)->rsrc_regs.end - \
 456                                          (dev)->rsrc_regs.start + 1)
 457 #define EMAC4_ETHTOOL_REGS_VER          1
 458 #define EMAC4_ETHTOOL_REGS_SIZE(dev)    ((dev)->rsrc_regs.end - \
 459                                          (dev)->rsrc_regs.start + 1)
 460
 461 #endif /* __IBM_NEWEMAC_CORE_H */