drivers/net/davinci_emac.c

   1 /*
   2  * DaVinci Ethernet Medium Access Controller
   3  *
   4  * DaVinci EMAC is based upon CPPI 3.0 TI DMA engine
   5  *
   6  * Copyright (C) 2009 Texas Instruments.
   7  *
   8  * ---------------------------------------------------------------------------
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23  * ---------------------------------------------------------------------------
  24  * History:
  25  * 0-5 A number of folks worked on this driver in bits and pieces but the major
  26  *     contribution came from Suraj Iyer and Anant Gole
  27  * 6.0 Anant Gole - rewrote the driver as per Linux conventions
  28  * 6.1 Chaithrika U S - added support for Gigabit and RMII features,
  29  *     PHY layer usage
  30  */
  31
  32 #include <linux/module.h>
  33 #include <linux/kernel.h>
  34 #include <linux/sched.h>
  35 #include <linux/string.h>
  36 #include <linux/timer.h>
  37 #include <linux/errno.h>
  38 #include <linux/in.h>
  39 #include <linux/ioport.h>
  40 #include <linux/slab.h>
  41 #include <linux/mm.h>
  42 #include <linux/interrupt.h>
  43 #include <linux/init.h>
  44 #include <linux/netdevice.h>
  45 #include <linux/etherdevice.h>
  46 #include <linux/skbuff.h>
  47 #include <linux/ethtool.h>
  48 #include <linux/highmem.h>
  49 #include <linux/proc_fs.h>
  50 #include <linux/ctype.h>
  51 #include <linux/version.h>
  52 #include <linux/spinlock.h>
  53 #include <linux/dma-mapping.h>
  54 #include <linux/clk.h>
  55 #include <linux/platform_device.h>
  56 #include <linux/semaphore.h>
  57 #include <linux/phy.h>
  58 #include <linux/bitops.h>
  59 #include <linux/io.h>
  60 #include <linux/uaccess.h>
  61 #include <linux/davinci_emac.h>
  62
  63 #include <asm/irq.h>
  64 #include <asm/page.h>
  65
  66 #include "davinci_cpdma.h"
  67
  68 static int debug_level;
  69 module_param(debug_level, int, 0);
  70 MODULE_PARM_DESC(debug_level, "DaVinci EMAC debug level (NETIF_MSG bits)");
  71
  72 /* Netif debug messages possible */
  73 #define DAVINCI_EMAC_DEBUG      (NETIF_MSG_DRV | \
  74                                 NETIF_MSG_PROBE | \
  75                                 NETIF_MSG_LINK | \
  76                                 NETIF_MSG_TIMER | \
  77                                 NETIF_MSG_IFDOWN | \
  78                                 NETIF_MSG_IFUP | \
  79                                 NETIF_MSG_RX_ERR | \
  80                                 NETIF_MSG_TX_ERR | \
  81                                 NETIF_MSG_TX_QUEUED | \
  82                                 NETIF_MSG_INTR | \
  83                                 NETIF_MSG_TX_DONE | \
  84                                 NETIF_MSG_RX_STATUS | \
  85                                 NETIF_MSG_PKTDATA | \
  86                                 NETIF_MSG_HW | \
  87                                 NETIF_MSG_WOL)
  88
  89 /* version info */
  90 #define EMAC_MAJOR_VERSION      6
  91 #define EMAC_MINOR_VERSION      1
  92 #define EMAC_MODULE_VERSION     "6.1"
  93 MODULE_VERSION(EMAC_MODULE_VERSION);
  94 static const char emac_version_string[] = "TI DaVinci EMAC Linux v6.1";
  95
  96 /* Configuration items */
  97 #define EMAC_DEF_PASS_CRC               (0) /* Do not pass CRC upto frames */
  98 #define EMAC_DEF_QOS_EN                 (0) /* EMAC proprietary QoS disabled */
  99 #define EMAC_DEF_NO_BUFF_CHAIN          (0) /* No buffer chain */
 100 #define EMAC_DEF_MACCTRL_FRAME_EN       (0) /* Discard Maccontrol frames */
 101 #define EMAC_DEF_SHORT_FRAME_EN         (0) /* Discard short frames */
 102 #define EMAC_DEF_ERROR_FRAME_EN         (0) /* Discard error frames */
 103 #define EMAC_DEF_PROM_EN                (0) /* Promiscous disabled */
 104 #define EMAC_DEF_PROM_CH                (0) /* Promiscous channel is 0 */
 105 #define EMAC_DEF_BCAST_EN               (1) /* Broadcast enabled */
 106 #define EMAC_DEF_BCAST_CH               (0) /* Broadcast channel is 0 */
 107 #define EMAC_DEF_MCAST_EN               (1) /* Multicast enabled */
 108 #define EMAC_DEF_MCAST_CH               (0) /* Multicast channel is 0 */
 109
 110 #define EMAC_DEF_TXPRIO_FIXED           (1) /* TX Priority is fixed */
 111 #define EMAC_DEF_TXPACING_EN            (0) /* TX pacing NOT supported*/
 112
 113 #define EMAC_DEF_BUFFER_OFFSET          (0) /* Buffer offset to DMA (future) */
 114 #define EMAC_DEF_MIN_ETHPKTSIZE         (60) /* Minimum ethernet pkt size */
 115 #define EMAC_DEF_MAX_FRAME_SIZE         (1500 + 14 + 4 + 4)
 116 #define EMAC_DEF_TX_CH                  (0) /* Default 0th channel */
 117 #define EMAC_DEF_RX_CH                  (0) /* Default 0th channel */
 118 #define EMAC_DEF_RX_NUM_DESC            (128)
 119 #define EMAC_DEF_MAX_TX_CH              (1) /* Max TX channels configured */
 120 #define EMAC_DEF_MAX_RX_CH              (1) /* Max RX channels configured */
 121 #define EMAC_POLL_WEIGHT                (64) /* Default NAPI poll weight */
 122
 123 /* Buffer descriptor parameters */
 124 #define EMAC_DEF_TX_MAX_SERVICE         (32) /* TX max service BD's */
 125 #define EMAC_DEF_RX_MAX_SERVICE         (64) /* should = netdev->weight */
 126
 127 /* EMAC register related defines */
 128 #define EMAC_ALL_MULTI_REG_VALUE        (0xFFFFFFFF)
 129 #define EMAC_NUM_MULTICAST_BITS         (64)
 130 #define EMAC_TX_CONTROL_TX_ENABLE_VAL   (0x1)
 131 #define EMAC_RX_CONTROL_RX_ENABLE_VAL   (0x1)
 132 #define EMAC_MAC_HOST_ERR_INTMASK_VAL   (0x2)
 133 #define EMAC_RX_UNICAST_CLEAR_ALL       (0xFF)
 134 #define EMAC_INT_MASK_CLEAR             (0xFF)
 135
 136 /* RX MBP register bit positions */
 137 #define EMAC_RXMBP_PASSCRC_MASK         BIT(30)
 138 #define EMAC_RXMBP_QOSEN_MASK           BIT(29)
 139 #define EMAC_RXMBP_NOCHAIN_MASK         BIT(28)
 140 #define EMAC_RXMBP_CMFEN_MASK           BIT(24)
 141 #define EMAC_RXMBP_CSFEN_MASK           BIT(23)
 142 #define EMAC_RXMBP_CEFEN_MASK           BIT(22)
 143 #define EMAC_RXMBP_CAFEN_MASK           BIT(21)
 144 #define EMAC_RXMBP_PROMCH_SHIFT         (16)
 145 #define EMAC_RXMBP_PROMCH_MASK          (0x7 << 16)
 146 #define EMAC_RXMBP_BROADEN_MASK         BIT(13)
 147 #define EMAC_RXMBP_BROADCH_SHIFT        (8)
 148 #define EMAC_RXMBP_BROADCH_MASK         (0x7 << 8)
 149 #define EMAC_RXMBP_MULTIEN_MASK         BIT(5)
 150 #define EMAC_RXMBP_MULTICH_SHIFT        (0)
 151 #define EMAC_RXMBP_MULTICH_MASK         (0x7)
 152 #define EMAC_RXMBP_CHMASK               (0x7)
 153
 154 /* EMAC register definitions/bit maps used */
 155 # define EMAC_MBP_RXPROMISC             (0x00200000)
 156 # define EMAC_MBP_PROMISCCH(ch)         (((ch) & 0x7) << 16)
 157 # define EMAC_MBP_RXBCAST               (0x00002000)
 158 # define EMAC_MBP_BCASTCHAN(ch)         (((ch) & 0x7) << 8)
 159 # define EMAC_MBP_RXMCAST               (0x00000020)
 160 # define EMAC_MBP_MCASTCHAN(ch)         ((ch) & 0x7)
 161
 162 /* EMAC mac_control register */
 163 #define EMAC_MACCONTROL_TXPTYPE         BIT(9)
 164 #define EMAC_MACCONTROL_TXPACEEN        BIT(6)
 165 #define EMAC_MACCONTROL_GMIIEN          BIT(5)
 166 #define EMAC_MACCONTROL_GIGABITEN       BIT(7)
 167 #define EMAC_MACCONTROL_FULLDUPLEXEN    BIT(0)
 168 #define EMAC_MACCONTROL_RMIISPEED_MASK  BIT(15)
 169
 170 /* GIGABIT MODE related bits */
 171 #define EMAC_DM646X_MACCONTORL_GIG      BIT(7)
 172 #define EMAC_DM646X_MACCONTORL_GIGFORCE BIT(17)
 173
 174 /* EMAC mac_status register */
 175 #define EMAC_MACSTATUS_TXERRCODE_MASK   (0xF00000)
 176 #define EMAC_MACSTATUS_TXERRCODE_SHIFT  (20)
 177 #define EMAC_MACSTATUS_TXERRCH_MASK     (0x7)
 178 #define EMAC_MACSTATUS_TXERRCH_SHIFT    (16)
 179 #define EMAC_MACSTATUS_RXERRCODE_MASK   (0xF000)
 180 #define EMAC_MACSTATUS_RXERRCODE_SHIFT  (12)
 181 #define EMAC_MACSTATUS_RXERRCH_MASK     (0x7)
 182 #define EMAC_MACSTATUS_RXERRCH_SHIFT    (8)
 183
 184 /* EMAC RX register masks */
 185 #define EMAC_RX_MAX_LEN_MASK            (0xFFFF)
 186 #define EMAC_RX_BUFFER_OFFSET_MASK      (0xFFFF)
 187
 188 /* MAC_IN_VECTOR (0x180) register bit fields */
 189 #define EMAC_DM644X_MAC_IN_VECTOR_HOST_INT      BIT(17)
 190 #define EMAC_DM644X_MAC_IN_VECTOR_STATPEND_INT  BIT(16)
 191 #define EMAC_DM644X_MAC_IN_VECTOR_RX_INT_VEC    BIT(8)
 192 #define EMAC_DM644X_MAC_IN_VECTOR_TX_INT_VEC    BIT(0)
 193
 194 /** NOTE:: For DM646x the IN_VECTOR has changed */
 195 #define EMAC_DM646X_MAC_IN_VECTOR_RX_INT_VEC    BIT(EMAC_DEF_RX_CH)
 196 #define EMAC_DM646X_MAC_IN_VECTOR_TX_INT_VEC    BIT(16 + EMAC_DEF_TX_CH)
 197 #define EMAC_DM646X_MAC_IN_VECTOR_HOST_INT      BIT(26)
 198 #define EMAC_DM646X_MAC_IN_VECTOR_STATPEND_INT  BIT(27)
 199
 200 /* CPPI bit positions */
 201 #define EMAC_CPPI_SOP_BIT               BIT(31)
 202 #define EMAC_CPPI_EOP_BIT               BIT(30)
 203 #define EMAC_CPPI_OWNERSHIP_BIT         BIT(29)
 204 #define EMAC_CPPI_EOQ_BIT               BIT(28)
 205 #define EMAC_CPPI_TEARDOWN_COMPLETE_BIT BIT(27)
 206 #define EMAC_CPPI_PASS_CRC_BIT          BIT(26)
 207 #define EMAC_RX_BD_BUF_SIZE             (0xFFFF)
 208 #define EMAC_BD_LENGTH_FOR_CACHE        (16) /* only CPPI bytes */
 209 #define EMAC_RX_BD_PKT_LENGTH_MASK      (0xFFFF)
 210
 211 /* Max hardware defines */
 212 #define EMAC_MAX_TXRX_CHANNELS           (8)  /* Max hardware channels */
 213 #define EMAC_DEF_MAX_MULTICAST_ADDRESSES (64) /* Max mcast addr's */
 214
 215 /* EMAC Peripheral Device Register Memory Layout structure */
 216 #define EMAC_MACINVECTOR        0x90
 217
 218 #define EMAC_DM646X_MACEOIVECTOR        0x94
 219
 220 #define EMAC_MACINTSTATRAW      0xB0
 221 #define EMAC_MACINTSTATMASKED   0xB4
 222 #define EMAC_MACINTMASKSET      0xB8
 223 #define EMAC_MACINTMASKCLEAR    0xBC
 224
 225 #define EMAC_RXMBPENABLE        0x100
 226 #define EMAC_RXUNICASTSET       0x104
 227 #define EMAC_RXUNICASTCLEAR     0x108
 228 #define EMAC_RXMAXLEN           0x10C
 229 #define EMAC_RXBUFFEROFFSET     0x110
 230 #define EMAC_RXFILTERLOWTHRESH  0x114
 231
 232 #define EMAC_MACCONTROL         0x160
 233 #define EMAC_MACSTATUS          0x164
 234 #define EMAC_EMCONTROL          0x168
 235 #define EMAC_FIFOCONTROL        0x16C
 236 #define EMAC_MACCONFIG          0x170
 237 #define EMAC_SOFTRESET          0x174
 238 #define EMAC_MACSRCADDRLO       0x1D0
 239 #define EMAC_MACSRCADDRHI       0x1D4
 240 #define EMAC_MACHASH1           0x1D8
 241 #define EMAC_MACHASH2           0x1DC
 242 #define EMAC_MACADDRLO          0x500
 243 #define EMAC_MACADDRHI          0x504
 244 #define EMAC_MACINDEX           0x508
 245
 246 /* EMAC statistics registers */
 247 #define EMAC_RXGOODFRAMES       0x200
 248 #define EMAC_RXBCASTFRAMES      0x204
 249 #define EMAC_RXMCASTFRAMES      0x208
 250 #define EMAC_RXPAUSEFRAMES      0x20C
 251 #define EMAC_RXCRCERRORS        0x210
 252 #define EMAC_RXALIGNCODEERRORS  0x214
 253 #define EMAC_RXOVERSIZED        0x218
 254 #define EMAC_RXJABBER           0x21C
 255 #define EMAC_RXUNDERSIZED       0x220
 256 #define EMAC_RXFRAGMENTS        0x224
 257 #define EMAC_RXFILTERED         0x228
 258 #define EMAC_RXQOSFILTERED      0x22C
 259 #define EMAC_RXOCTETS           0x230
 260 #define EMAC_TXGOODFRAMES       0x234
 261 #define EMAC_TXBCASTFRAMES      0x238
 262 #define EMAC_TXMCASTFRAMES      0x23C
 263 #define EMAC_TXPAUSEFRAMES      0x240
 264 #define EMAC_TXDEFERRED         0x244
 265 #define EMAC_TXCOLLISION        0x248
 266 #define EMAC_TXSINGLECOLL       0x24C
 267 #define EMAC_TXMULTICOLL        0x250
 268 #define EMAC_TXEXCESSIVECOLL    0x254
 269 #define EMAC_TXLATECOLL         0x258
 270 #define EMAC_TXUNDERRUN         0x25C
 271 #define EMAC_TXCARRIERSENSE     0x260
 272 #define EMAC_TXOCTETS           0x264
 273 #define EMAC_NETOCTETS          0x280
 274 #define EMAC_RXSOFOVERRUNS      0x284
 275 #define EMAC_RXMOFOVERRUNS      0x288
 276 #define EMAC_RXDMAOVERRUNS      0x28C
 277
 278 /* EMAC DM644x control registers */
 279 #define EMAC_CTRL_EWCTL         (0x4)
 280 #define EMAC_CTRL_EWINTTCNT     (0x8)
 281
 282 /* EMAC DM644x control module masks */
 283 #define EMAC_DM644X_EWINTCNT_MASK       0x1FFFF
 284 #define EMAC_DM644X_INTMIN_INTVL        0x1
 285 #define EMAC_DM644X_INTMAX_INTVL        (EMAC_DM644X_EWINTCNT_MASK)
 286
 287 /* EMAC DM646X control module registers */
 288 #define EMAC_DM646X_CMINTCTRL   0x0C
 289 #define EMAC_DM646X_CMRXINTEN   0x14
 290 #define EMAC_DM646X_CMTXINTEN   0x18
 291 #define EMAC_DM646X_CMRXINTMAX  0x70
 292 #define EMAC_DM646X_CMTXINTMAX  0x74
 293
 294 /* EMAC DM646X control module masks */
 295 #define EMAC_DM646X_INTPACEEN           (0x3 << 16)
 296 #define EMAC_DM646X_INTPRESCALE_MASK    (0x7FF << 0)
 297 #define EMAC_DM646X_CMINTMAX_CNT        63
 298 #define EMAC_DM646X_CMINTMIN_CNT        2
 299 #define EMAC_DM646X_CMINTMAX_INTVL      (1000 / EMAC_DM646X_CMINTMIN_CNT)
 300 #define EMAC_DM646X_CMINTMIN_INTVL      ((1000 / EMAC_DM646X_CMINTMAX_CNT) + 1)
 301
 302
 303 /* EMAC EOI codes for C0 */
 304 #define EMAC_DM646X_MAC_EOI_C0_RXEN     (0x01)
 305 #define EMAC_DM646X_MAC_EOI_C0_TXEN     (0x02)
 306
 307 /* EMAC Stats Clear Mask */
 308 #define EMAC_STATS_CLR_MASK    (0xFFFFFFFF)
 309
 310 /* emac_priv: EMAC private data structure
 311  *
 312  * EMAC adapter private data structure
 313  */
 314 struct emac_priv {
 315         u32 msg_enable;
 316         struct net_device *ndev;
 317         struct platform_device *pdev;
 318         struct napi_struct napi;
 319         char mac_addr[6];
 320         void __iomem *remap_addr;
 321         u32 emac_base_phys;
 322         void __iomem *emac_base;
 323         void __iomem *ctrl_base;
 324         struct cpdma_ctlr *dma;
 325         struct cpdma_chan *txchan;
 326         struct cpdma_chan *rxchan;
 327         u32 link; /* 1=link on, 0=link off */
 328         u32 speed; /* 0=Auto Neg, 1=No PHY, 10,100, 1000 - mbps */
 329         u32 duplex; /* Link duplex: 0=Half, 1=Full */
 330         u32 rx_buf_size;
 331         u32 isr_count;
 332         u32 coal_intvl;
 333         u32 bus_freq_mhz;
 334         u8 rmii_en;
 335         u8 version;
 336         u32 mac_hash1;
 337         u32 mac_hash2;
 338         u32 multicast_hash_cnt[EMAC_NUM_MULTICAST_BITS];
 339         u32 rx_addr_type;
 340         const char *phy_id;
 341         struct phy_device *phydev;
 342         spinlock_t lock;
 343         /*platform specific members*/
 344         void (*int_enable) (void);
 345         void (*int_disable) (void);
 346 };
 347
 348 /* clock frequency for EMAC */
 349 static struct clk *emac_clk;
 350 static unsigned long emac_bus_frequency;
 351
 352 /* EMAC TX Host Error description strings */
 353 static char *emac_txhost_errcodes[16] = {
 354         "No error", "SOP error", "Ownership bit not set in SOP buffer",
 355         "Zero Next Buffer Descriptor Pointer Without EOP",
 356         "Zero Buffer Pointer", "Zero Buffer Length", "Packet Length Error",
 357         "Reserved", "Reserved", "Reserved", "Reserved", "Reserved",
 358         "Reserved", "Reserved", "Reserved", "Reserved"
 359 };
 360
 361 /* EMAC RX Host Error description strings */
 362 static char *emac_rxhost_errcodes[16] = {
 363         "No error", "Reserved", "Ownership bit not set in input buffer",
 364         "Reserved", "Zero Buffer Pointer", "Reserved", "Reserved",
 365         "Reserved", "Reserved", "Reserved", "Reserved", "Reserved",
 366         "Reserved", "Reserved", "Reserved", "Reserved"
 367 };
 368
 369 /* Helper macros */
 370 #define emac_read(reg)            ioread32(priv->emac_base + (reg))
 371 #define emac_write(reg, val)      iowrite32(val, priv->emac_base + (reg))
 372
 373 #define emac_ctrl_read(reg)       ioread32((priv->ctrl_base + (reg)))
 374 #define emac_ctrl_write(reg, val) iowrite32(val, (priv->ctrl_base + (reg)))
 375
 376 /**
 377  * emac_dump_regs: Dump important EMAC registers to debug terminal
 378  * @priv: The DaVinci EMAC private adapter structure
 379  *
 380  * Executes ethtool set cmd & sets phy mode
 381  *
 382  */
 383 static void emac_dump_regs(struct emac_priv *priv)
 384 {
 385         struct device *emac_dev = &priv->ndev->dev;
 386
 387         /* Print important registers in EMAC */
 388         dev_info(emac_dev, "EMAC Basic registers\n");
 389         if (priv->version == EMAC_VERSION_1) {
 390                 dev_info(emac_dev, "EMAC: EWCTL: %08X, EWINTTCNT: %08X\n",
 391                         emac_ctrl_read(EMAC_CTRL_EWCTL),
 392                         emac_ctrl_read(EMAC_CTRL_EWINTTCNT));
 393         }
 394         dev_info(emac_dev, "EMAC: EmuControl:%08X, FifoControl: %08X\n",
 395                 emac_read(EMAC_EMCONTROL), emac_read(EMAC_FIFOCONTROL));
 396         dev_info(emac_dev, "EMAC: MBPEnable:%08X, RXUnicastSet: %08X, "\
 397                 "RXMaxLen=%08X\n", emac_read(EMAC_RXMBPENABLE),
 398                 emac_read(EMAC_RXUNICASTSET), emac_read(EMAC_RXMAXLEN));
 399         dev_info(emac_dev, "EMAC: MacControl:%08X, MacStatus: %08X, "\
 400                 "MacConfig=%08X\n", emac_read(EMAC_MACCONTROL),
 401                 emac_read(EMAC_MACSTATUS), emac_read(EMAC_MACCONFIG));
 402         dev_info(emac_dev, "EMAC Statistics\n");
 403         dev_info(emac_dev, "EMAC: rx_good_frames:%d\n",
 404                 emac_read(EMAC_RXGOODFRAMES));
 405         dev_info(emac_dev, "EMAC: rx_broadcast_frames:%d\n",
 406                 emac_read(EMAC_RXBCASTFRAMES));
 407         dev_info(emac_dev, "EMAC: rx_multicast_frames:%d\n",
 408                 emac_read(EMAC_RXMCASTFRAMES));
 409         dev_info(emac_dev, "EMAC: rx_pause_frames:%d\n",
 410                 emac_read(EMAC_RXPAUSEFRAMES));
 411         dev_info(emac_dev, "EMAC: rx_crcerrors:%d\n",
 412                 emac_read(EMAC_RXCRCERRORS));
 413         dev_info(emac_dev, "EMAC: rx_align_code_errors:%d\n",
 414                 emac_read(EMAC_RXALIGNCODEERRORS));
 415         dev_info(emac_dev, "EMAC: rx_oversized_frames:%d\n",
 416                 emac_read(EMAC_RXOVERSIZED));
 417         dev_info(emac_dev, "EMAC: rx_jabber_frames:%d\n",
 418                 emac_read(EMAC_RXJABBER));
 419         dev_info(emac_dev, "EMAC: rx_undersized_frames:%d\n",
 420                 emac_read(EMAC_RXUNDERSIZED));
 421         dev_info(emac_dev, "EMAC: rx_fragments:%d\n",
 422                 emac_read(EMAC_RXFRAGMENTS));
 423         dev_info(emac_dev, "EMAC: rx_filtered_frames:%d\n",
 424                 emac_read(EMAC_RXFILTERED));
 425         dev_info(emac_dev, "EMAC: rx_qos_filtered_frames:%d\n",
 426                 emac_read(EMAC_RXQOSFILTERED));
 427         dev_info(emac_dev, "EMAC: rx_octets:%d\n",
 428                 emac_read(EMAC_RXOCTETS));
 429         dev_info(emac_dev, "EMAC: tx_goodframes:%d\n",
 430                 emac_read(EMAC_TXGOODFRAMES));
 431         dev_info(emac_dev, "EMAC: tx_bcastframes:%d\n",
 432                 emac_read(EMAC_TXBCASTFRAMES));
 433         dev_info(emac_dev, "EMAC: tx_mcastframes:%d\n",
 434                 emac_read(EMAC_TXMCASTFRAMES));
 435         dev_info(emac_dev, "EMAC: tx_pause_frames:%d\n",
 436                 emac_read(EMAC_TXPAUSEFRAMES));
 437         dev_info(emac_dev, "EMAC: tx_deferred_frames:%d\n",
 438                 emac_read(EMAC_TXDEFERRED));
 439         dev_info(emac_dev, "EMAC: tx_collision_frames:%d\n",
 440                 emac_read(EMAC_TXCOLLISION));
 441         dev_info(emac_dev, "EMAC: tx_single_coll_frames:%d\n",
 442                 emac_read(EMAC_TXSINGLECOLL));
 443         dev_info(emac_dev, "EMAC: tx_mult_coll_frames:%d\n",
 444                 emac_read(EMAC_TXMULTICOLL));
 445         dev_info(emac_dev, "EMAC: tx_excessive_collisions:%d\n",
 446                 emac_read(EMAC_TXEXCESSIVECOLL));
 447         dev_info(emac_dev, "EMAC: tx_late_collisions:%d\n",
 448                 emac_read(EMAC_TXLATECOLL));
 449         dev_info(emac_dev, "EMAC: tx_underrun:%d\n",
 450                 emac_read(EMAC_TXUNDERRUN));
 451         dev_info(emac_dev, "EMAC: tx_carrier_sense_errors:%d\n",
 452                 emac_read(EMAC_TXCARRIERSENSE));
 453         dev_info(emac_dev, "EMAC: tx_octets:%d\n",
 454                 emac_read(EMAC_TXOCTETS));
 455         dev_info(emac_dev, "EMAC: net_octets:%d\n",
 456                 emac_read(EMAC_NETOCTETS));
 457         dev_info(emac_dev, "EMAC: rx_sof_overruns:%d\n",
 458                 emac_read(EMAC_RXSOFOVERRUNS));
 459         dev_info(emac_dev, "EMAC: rx_mof_overruns:%d\n",
 460                 emac_read(EMAC_RXMOFOVERRUNS));
 461         dev_info(emac_dev, "EMAC: rx_dma_overruns:%d\n",
 462                 emac_read(EMAC_RXDMAOVERRUNS));
 463
 464         cpdma_ctlr_dump(priv->dma);
 465 }
 466
 467 /**
 468  * emac_get_drvinfo: Get EMAC driver information
 469  * @ndev: The DaVinci EMAC network adapter
 470  * @info: ethtool info structure containing name and version
 471  *
 472  * Returns EMAC driver information (name and version)
 473  *
 474  */
 475 static void emac_get_drvinfo(struct net_device *ndev,
 476                              struct ethtool_drvinfo *info)
 477 {
 478         strcpy(info->driver, emac_version_string);
 479         strcpy(info->version, EMAC_MODULE_VERSION);
 480 }
 481
 482 /**
 483  * emac_get_settings: Get EMAC settings
 484  * @ndev: The DaVinci EMAC network adapter
 485  * @ecmd: ethtool command
 486  *
 487  * Executes ethool get command
 488  *
 489  */
 490 static int emac_get_settings(struct net_device *ndev,
 491                              struct ethtool_cmd *ecmd)
 492 {
 493         struct emac_priv *priv = netdev_priv(ndev);
 494         if (priv->phydev)
 495                 return phy_ethtool_gset(priv->phydev, ecmd);
 496         else
 497                 return -EOPNOTSUPP;
 498
 499 }
 500
 501 /**
 502  * emac_set_settings: Set EMAC settings
 503  * @ndev: The DaVinci EMAC network adapter
 504  * @ecmd: ethtool command
 505  *
 506  * Executes ethool set command
 507  *
 508  */
 509 static int emac_set_settings(struct net_device *ndev, struct ethtool_cmd *ecmd)
 510 {
 511         struct emac_priv *priv = netdev_priv(ndev);
 512         if (priv->phydev)
 513                 return phy_ethtool_sset(priv->phydev, ecmd);
 514         else
 515                 return -EOPNOTSUPP;
 516
 517 }
 518
 519 /**
 520  * emac_get_coalesce : Get interrupt coalesce settings for this device
 521  * @ndev : The DaVinci EMAC network adapter
 522  * @coal : ethtool coalesce settings structure
 523  *
 524  * Fetch the current interrupt coalesce settings
 525  *
 526  */
 527 static int emac_get_coalesce(struct net_device *ndev,
 528                                 struct ethtool_coalesce *coal)
 529 {
 530         struct emac_priv *priv = netdev_priv(ndev);
 531
 532         coal->rx_coalesce_usecs = priv->coal_intvl;
 533         return 0;
 534
 535 }
 536
 537 /**
 538  * emac_set_coalesce : Set interrupt coalesce settings for this device
 539  * @ndev : The DaVinci EMAC network adapter
 540  * @coal : ethtool coalesce settings structure
 541  *
 542  * Set interrupt coalesce parameters
 543  *
 544  */
 545 static int emac_set_coalesce(struct net_device *ndev,
 546                                 struct ethtool_coalesce *coal)
 547 {
 548         struct emac_priv *priv = netdev_priv(ndev);
 549         u32 int_ctrl, num_interrupts = 0;
 550         u32 prescale = 0, addnl_dvdr = 1, coal_intvl = 0;
 551
 552         if (!coal->rx_coalesce_usecs)
 553                 return -EINVAL;
 554
 555         coal_intvl = coal->rx_coalesce_usecs;
 556
 557         switch (priv->version) {
 558         case EMAC_VERSION_2:
 559                 int_ctrl =  emac_ctrl_read(EMAC_DM646X_CMINTCTRL);
 560                 prescale = priv->bus_freq_mhz * 4;
 561
 562                 if (coal_intvl < EMAC_DM646X_CMINTMIN_INTVL)
 563                         coal_intvl = EMAC_DM646X_CMINTMIN_INTVL;
 564
 565                 if (coal_intvl > EMAC_DM646X_CMINTMAX_INTVL) {
 566                         /*
 567                          * Interrupt pacer works with 4us Pulse, we can
 568                          * throttle further by dilating the 4us pulse.
 569                          */
 570                         addnl_dvdr = EMAC_DM646X_INTPRESCALE_MASK / prescale;
 571
 572                         if (addnl_dvdr > 1) {
 573                                 prescale *= addnl_dvdr;
 574                                 if (coal_intvl > (EMAC_DM646X_CMINTMAX_INTVL
 575                                                         * addnl_dvdr))
 576                                         coal_intvl = (EMAC_DM646X_CMINTMAX_INTVL
 577                                                         * addnl_dvdr);
 578                         } else {
 579                                 addnl_dvdr = 1;
 580                                 coal_intvl = EMAC_DM646X_CMINTMAX_INTVL;
 581                         }
 582                 }
 583
 584                 num_interrupts = (1000 * addnl_dvdr) / coal_intvl;
 585
 586                 int_ctrl |= EMAC_DM646X_INTPACEEN;
 587                 int_ctrl &= (~EMAC_DM646X_INTPRESCALE_MASK);
 588                 int_ctrl |= (prescale & EMAC_DM646X_INTPRESCALE_MASK);
 589                 emac_ctrl_write(EMAC_DM646X_CMINTCTRL, int_ctrl);
 590
 591                 emac_ctrl_write(EMAC_DM646X_CMRXINTMAX, num_interrupts);
 592                 emac_ctrl_write(EMAC_DM646X_CMTXINTMAX, num_interrupts);
 593
 594                 break;
 595         default:
 596                 int_ctrl = emac_ctrl_read(EMAC_CTRL_EWINTTCNT);
 597                 int_ctrl &= (~EMAC_DM644X_EWINTCNT_MASK);
 598                 prescale = coal_intvl * priv->bus_freq_mhz;
 599                 if (prescale > EMAC_DM644X_EWINTCNT_MASK) {
 600                         prescale = EMAC_DM644X_EWINTCNT_MASK;
 601                         coal_intvl = prescale / priv->bus_freq_mhz;
 602                 }
 603                 emac_ctrl_write(EMAC_CTRL_EWINTTCNT, (int_ctrl | prescale));
 604
 605                 break;
 606         }
 607
 608         printk(KERN_INFO"Set coalesce to %d usecs.\n", coal_intvl);
 609         priv->coal_intvl = coal_intvl;
 610
 611         return 0;
 612
 613 }
 614
 615
 616 /**
 617  * ethtool_ops: DaVinci EMAC Ethtool structure
 618  *
 619  * Ethtool support for EMAC adapter
 620  *
 621  */
 622 static const struct ethtool_ops ethtool_ops = {
 623         .get_drvinfo = emac_get_drvinfo,
 624         .get_settings = emac_get_settings,
 625         .set_settings = emac_set_settings,
 626         .get_link = ethtool_op_get_link,
 627         .get_coalesce = emac_get_coalesce,
 628         .set_coalesce =  emac_set_coalesce,
 629 };
 630
 631 /**
 632  * emac_update_phystatus: Update Phy status
 633  * @priv: The DaVinci EMAC private adapter structure
 634  *
 635  * Updates phy status and takes action for network queue if required
 636  * based upon link status
 637  *
 638  */
 639 static void emac_update_phystatus(struct emac_priv *priv)
 640 {
 641         u32 mac_control;
 642         u32 new_duplex;
 643         u32 cur_duplex;
 644         struct net_device *ndev = priv->ndev;
 645
 646         mac_control = emac_read(EMAC_MACCONTROL);
 647         cur_duplex = (mac_control & EMAC_MACCONTROL_FULLDUPLEXEN) ?
 648                         DUPLEX_FULL : DUPLEX_HALF;
 649         if (priv->phydev)
 650                 new_duplex = priv->phydev->duplex;
 651         else
 652                 new_duplex = DUPLEX_FULL;
 653
 654         /* We get called only if link has changed (speed/duplex/status) */
 655         if ((priv->link) && (new_duplex != cur_duplex)) {
 656                 priv->duplex = new_duplex;
 657                 if (DUPLEX_FULL == priv->duplex)
 658                         mac_control |= (EMAC_MACCONTROL_FULLDUPLEXEN);
 659                 else
 660                         mac_control &= ~(EMAC_MACCONTROL_FULLDUPLEXEN);
 661         }
 662
 663         if (priv->speed == SPEED_1000 && (priv->version == EMAC_VERSION_2)) {
 664                 mac_control = emac_read(EMAC_MACCONTROL);
 665                 mac_control |= (EMAC_DM646X_MACCONTORL_GIG |
 666                                 EMAC_DM646X_MACCONTORL_GIGFORCE);
 667         } else {
 668                 /* Clear the GIG bit and GIGFORCE bit */
 669                 mac_control &= ~(EMAC_DM646X_MACCONTORL_GIGFORCE |
 670                                         EMAC_DM646X_MACCONTORL_GIG);
 671
 672                 if (priv->rmii_en && (priv->speed == SPEED_100))
 673                         mac_control |= EMAC_MACCONTROL_RMIISPEED_MASK;
 674                 else
 675                         mac_control &= ~EMAC_MACCONTROL_RMIISPEED_MASK;
 676         }
 677
 678         /* Update mac_control if changed */
 679         emac_write(EMAC_MACCONTROL, mac_control);
 680
 681         if (priv->link) {
 682                 /* link ON */
 683                 if (!netif_carrier_ok(ndev))
 684                         netif_carrier_on(ndev);
 685         /* reactivate the transmit queue if it is stopped */
 686                 if (netif_running(ndev) && netif_queue_stopped(ndev))
 687                         netif_wake_queue(ndev);
 688         } else {
 689                 /* link OFF */
 690                 if (netif_carrier_ok(ndev))
 691                         netif_carrier_off(ndev);
 692                 if (!netif_queue_stopped(ndev))
 693                         netif_stop_queue(ndev);
 694         }
 695 }
 696
 697 /**
 698  * hash_get: Calculate hash value from mac address
 699  * @addr: mac address to delete from hash table
 700  *
 701  * Calculates hash value from mac address
 702  *
 703  */
 704 static u32 hash_get(u8 *addr)
 705 {
 706         u32 hash;
 707         u8 tmpval;
 708         int cnt;
 709         hash = 0;
 710
 711         for (cnt = 0; cnt < 2; cnt++) {
 712                 tmpval = *addr++;
 713                 hash ^= (tmpval >> 2) ^ (tmpval << 4);
 714                 tmpval = *addr++;
 715                 hash ^= (tmpval >> 4) ^ (tmpval << 2);
 716                 tmpval = *addr++;
 717                 hash ^= (tmpval >> 6) ^ (tmpval);
 718         }
 719
 720         return hash & 0x3F;
 721 }
 722
 723 /**
 724  * hash_add: Hash function to add mac addr from hash table
 725  * @priv: The DaVinci EMAC private adapter structure
 726  * mac_addr: mac address to delete from hash table
 727  *
 728  * Adds mac address to the internal hash table
 729  *
 730  */
 731 static int hash_add(struct emac_priv *priv, u8 *mac_addr)
 732 {
 733         struct device *emac_dev = &priv->ndev->dev;
 734         u32 rc = 0;
 735         u32 hash_bit;
 736         u32 hash_value = hash_get(mac_addr);
 737
 738         if (hash_value >= EMAC_NUM_MULTICAST_BITS) {
 739                 if (netif_msg_drv(priv)) {
 740                         dev_err(emac_dev, "DaVinci EMAC: hash_add(): Invalid "\
 741                                 "Hash %08x, should not be greater than %08x",
 742                                 hash_value, (EMAC_NUM_MULTICAST_BITS - 1));
 743                 }
 744                 return -1;
 745         }
 746
 747         /* set the hash bit only if not previously set */
 748         if (priv->multicast_hash_cnt[hash_value] == 0) {
 749                 rc = 1; /* hash value changed */
 750                 if (hash_value < 32) {
 751                         hash_bit = BIT(hash_value);
 752                         priv->mac_hash1 |= hash_bit;
 753                 } else {
 754                         hash_bit = BIT((hash_value - 32));
 755                         priv->mac_hash2 |= hash_bit;
 756                 }
 757         }
 758
 759         /* incr counter for num of mcast addr's mapped to "this" hash bit */
 760         ++priv->multicast_hash_cnt[hash_value];
 761
 762         return rc;
 763 }
 764
 765 /**
 766  * hash_del: Hash function to delete mac addr from hash table
 767  * @priv: The DaVinci EMAC private adapter structure
 768  * mac_addr: mac address to delete from hash table
 769  *
 770  * Removes mac address from the internal hash table
 771  *
 772  */
 773 static int hash_del(struct emac_priv *priv, u8 *mac_addr)
 774 {
 775         u32 hash_value;
 776         u32 hash_bit;
 777
 778         hash_value = hash_get(mac_addr);
 779         if (priv->multicast_hash_cnt[hash_value] > 0) {
 780                 /* dec cntr for num of mcast addr's mapped to this hash bit */
 781                 --priv->multicast_hash_cnt[hash_value];
 782         }
 783
 784         /* if counter still > 0, at least one multicast address refers
 785          * to this hash bit. so return 0 */
 786         if (priv->multicast_hash_cnt[hash_value] > 0)
 787                 return 0;
 788
 789         if (hash_value < 32) {
 790                 hash_bit = BIT(hash_value);
 791                 priv->mac_hash1 &= ~hash_bit;
 792         } else {
 793                 hash_bit = BIT((hash_value - 32));
 794                 priv->mac_hash2 &= ~hash_bit;
 795         }
 796
 797         /* return 1 to indicate change in mac_hash registers reqd */
 798         return 1;
 799 }
 800
 801 /* EMAC multicast operation */
 802 #define EMAC_MULTICAST_ADD      0
 803 #define EMAC_MULTICAST_DEL      1
 804 #define EMAC_ALL_MULTI_SET      2
 805 #define EMAC_ALL_MULTI_CLR      3
 806
 807 /**
 808  * emac_add_mcast: Set multicast address in the EMAC adapter (Internal)
 809  * @priv: The DaVinci EMAC private adapter structure
 810  * @action: multicast operation to perform
 811  * mac_addr: mac address to set
 812  *
 813  * Set multicast addresses in EMAC adapter - internal function
 814  *
 815  */
 816 static void emac_add_mcast(struct emac_priv *priv, u32 action, u8 *mac_addr)
 817 {
 818         struct device *emac_dev = &priv->ndev->dev;
 819         int update = -1;
 820
 821         switch (action) {
 822         case EMAC_MULTICAST_ADD:
 823                 update = hash_add(priv, mac_addr);
 824                 break;
 825         case EMAC_MULTICAST_DEL:
 826                 update = hash_del(priv, mac_addr);
 827                 break;
 828         case EMAC_ALL_MULTI_SET:
 829                 update = 1;
 830                 priv->mac_hash1 = EMAC_ALL_MULTI_REG_VALUE;
 831                 priv->mac_hash2 = EMAC_ALL_MULTI_REG_VALUE;
 832                 break;
 833         case EMAC_ALL_MULTI_CLR:
 834                 update = 1;
 835                 priv->mac_hash1 = 0;
 836                 priv->mac_hash2 = 0;
 837                 memset(&(priv->multicast_hash_cnt[0]), 0,
 838                 sizeof(priv->multicast_hash_cnt[0]) *
 839                        EMAC_NUM_MULTICAST_BITS);
 840                 break;
 841         default:
 842                 if (netif_msg_drv(priv))
 843                         dev_err(emac_dev, "DaVinci EMAC: add_mcast"\
 844                                 ": bad operation %d", action);
 845                 break;
 846         }
 847
 848         /* write to the hardware only if the register status chances */
 849         if (update > 0) {
 850                 emac_write(EMAC_MACHASH1, priv->mac_hash1);
 851                 emac_write(EMAC_MACHASH2, priv->mac_hash2);
 852         }
 853 }
 854
 855 /**
 856  * emac_dev_mcast_set: Set multicast address in the EMAC adapter
 857  * @ndev: The DaVinci EMAC network adapter
 858  *
 859  * Set multicast addresses in EMAC adapter
 860  *
 861  */
 862 static void emac_dev_mcast_set(struct net_device *ndev)
 863 {
 864         u32 mbp_enable;
 865         struct emac_priv *priv = netdev_priv(ndev);
 866
 867         mbp_enable = emac_read(EMAC_RXMBPENABLE);
 868         if (ndev->flags & IFF_PROMISC) {
 869                 mbp_enable &= (~EMAC_MBP_PROMISCCH(EMAC_DEF_PROM_CH));
 870                 mbp_enable |= (EMAC_MBP_RXPROMISC);
 871         } else {
 872                 mbp_enable = (mbp_enable & ~EMAC_MBP_RXPROMISC);
 873                 if ((ndev->flags & IFF_ALLMULTI) ||
 874                     netdev_mc_count(ndev) > EMAC_DEF_MAX_MULTICAST_ADDRESSES) {
 875                         mbp_enable = (mbp_enable | EMAC_MBP_RXMCAST);
 876                         emac_add_mcast(priv, EMAC_ALL_MULTI_SET, NULL);
 877                 }
 878                 if (!netdev_mc_empty(ndev)) {
 879                         struct netdev_hw_addr *ha;
 880
 881                         mbp_enable = (mbp_enable | EMAC_MBP_RXMCAST);
 882                         emac_add_mcast(priv, EMAC_ALL_MULTI_CLR, NULL);
 883                         /* program multicast address list into EMAC hardware */
 884                         netdev_for_each_mc_addr(ha, ndev) {
 885                                 emac_add_mcast(priv, EMAC_MULTICAST_ADD,
 886                                                (u8 *) ha->addr);
 887                         }
 888                 } else {
 889                         mbp_enable = (mbp_enable & ~EMAC_MBP_RXMCAST);
 890                         emac_add_mcast(priv, EMAC_ALL_MULTI_CLR, NULL);
 891                 }
 892         }
 893         /* Set mbp config register */
 894         emac_write(EMAC_RXMBPENABLE, mbp_enable);
 895 }
 896
 897 /*************************************************************************
 898  *  EMAC Hardware manipulation
 899  *************************************************************************/
 900
 901 /**
 902  * emac_int_disable: Disable EMAC module interrupt (from adapter)
 903  * @priv: The DaVinci EMAC private adapter structure
 904  *
 905  * Disable EMAC interrupt on the adapter
 906  *
 907  */
 908 static void emac_int_disable(struct emac_priv *priv)
 909 {
 910         if (priv->version == EMAC_VERSION_2) {
 911                 unsigned long flags;
 912
 913                 local_irq_save(flags);
 914
 915                 /* Program C0_Int_En to zero to turn off
 916                 * interrupts to the CPU */
 917                 emac_ctrl_write(EMAC_DM646X_CMRXINTEN, 0x0);
 918                 emac_ctrl_write(EMAC_DM646X_CMTXINTEN, 0x0);
 919                 /* NOTE: Rx Threshold and Misc interrupts are not disabled */
 920                 if (priv->int_disable)
 921                         priv->int_disable();
 922
 923                 local_irq_restore(flags);
 924
 925         } else {
 926                 /* Set DM644x control registers for interrupt control */
 927                 emac_ctrl_write(EMAC_CTRL_EWCTL, 0x0);
 928         }
 929 }
 930
 931 /**
 932  * emac_int_enable: Enable EMAC module interrupt (from adapter)
 933  * @priv: The DaVinci EMAC private adapter structure
 934  *
 935  * Enable EMAC interrupt on the adapter
 936  *
 937  */
 938 static void emac_int_enable(struct emac_priv *priv)
 939 {
 940         if (priv->version == EMAC_VERSION_2) {
 941                 if (priv->int_enable)
 942                         priv->int_enable();
 943
 944                 emac_ctrl_write(EMAC_DM646X_CMRXINTEN, 0xff);
 945                 emac_ctrl_write(EMAC_DM646X_CMTXINTEN, 0xff);
 946
 947                 /* In addition to turning on interrupt Enable, we need
 948                  * ack by writing appropriate values to the EOI
 949                  * register */
 950
 951                 /* NOTE: Rx Threshold and Misc interrupts are not enabled */
 952
 953                 /* ack rxen only then a new pulse will be generated */
 954                 emac_write(EMAC_DM646X_MACEOIVECTOR,
 955                         EMAC_DM646X_MAC_EOI_C0_RXEN);
 956
 957                 /* ack txen- only then a new pulse will be generated */
 958                 emac_write(EMAC_DM646X_MACEOIVECTOR,
 959                         EMAC_DM646X_MAC_EOI_C0_TXEN);
 960
 961         } else {
 962                 /* Set DM644x control registers for interrupt control */
 963                 emac_ctrl_write(EMAC_CTRL_EWCTL, 0x1);
 964         }
 965 }
 966
 967 /**
 968  * emac_irq: EMAC interrupt handler
 969  * @irq: interrupt number
 970  * @dev_id: EMAC network adapter data structure ptr
 971  *
 972  * EMAC Interrupt handler - we only schedule NAPI and not process any packets
 973  * here. EVen the interrupt status is checked (TX/RX/Err) in NAPI poll function
 974  *
 975  * Returns interrupt handled condition
 976  */
 977 static irqreturn_t emac_irq(int irq, void *dev_id)
 978 {
 979         struct net_device *ndev = (struct net_device *)dev_id;
 980         struct emac_priv *priv = netdev_priv(ndev);
 981
 982         ++priv->isr_count;
 983         if (likely(netif_running(priv->ndev))) {
 984                 emac_int_disable(priv);
 985                 napi_schedule(&priv->napi);
 986         } else {
 987                 /* we are closing down, so dont process anything */
 988         }
 989         return IRQ_HANDLED;
 990 }
 991
 992 static struct sk_buff *emac_rx_alloc(struct emac_priv *priv)
 993 {
 994         struct sk_buff *skb = dev_alloc_skb(priv->rx_buf_size);
 995         if (WARN_ON(!skb))
 996                 return NULL;
 997         skb->dev = priv->ndev;
 998         skb_reserve(skb, NET_IP_ALIGN);
 999         return skb;
1000 }
1001
1002 static void emac_rx_handler(void *token, int len, int status)
1003 {
1004         struct sk_buff          *skb = token;
1005         struct net_device       *ndev = skb->dev;
1006         struct emac_priv        *priv = netdev_priv(ndev);
1007         struct device           *emac_dev = &ndev->dev;
1008         int                     ret;
1009
1010         /* free and bail if we are shutting down */
1011         if (unlikely(!netif_running(ndev))) {
1012                 dev_kfree_skb_any(skb);
1013                 return;
1014         }
1015
1016         /* recycle on recieve error */
1017         if (status < 0) {
1018                 ndev->stats.rx_errors++;
1019                 goto recycle;
1020         }
1021
1022         /* feed received packet up the stack */
1023         skb_put(skb, len);
1024         skb->protocol = eth_type_trans(skb, ndev);
1025         netif_receive_skb(skb);
1026         ndev->stats.rx_bytes += len;
1027         ndev->stats.rx_packets++;
1028
1029         /* alloc a new packet for receive */
1030         skb = emac_rx_alloc(priv);
1031         if (!skb) {
1032                 if (netif_msg_rx_err(priv) && net_ratelimit())
1033                         dev_err(emac_dev, "failed rx buffer alloc\n");
1034                 return;
1035         }
1036
1037 recycle:
1038         ret = cpdma_chan_submit(priv->rxchan, skb, skb->data,
1039                         skb_tailroom(skb), GFP_KERNEL);
1040         if (WARN_ON(ret < 0))
1041                 dev_kfree_skb_any(skb);
1042 }
1043
1044 static void emac_tx_handler(void *token, int len, int status)
1045 {
1046         struct sk_buff          *skb = token;
1047         struct net_device       *ndev = skb->dev;
1048
1049         if (unlikely(netif_queue_stopped(ndev)))
1050                 netif_start_queue(ndev);
1051         ndev->stats.tx_packets++;
1052         ndev->stats.tx_bytes += len;
1053         dev_kfree_skb_any(skb);
1054 }
1055
1056 /**
1057  * emac_dev_xmit: EMAC Transmit function
1058  * @skb: SKB pointer
1059  * @ndev: The DaVinci EMAC network adapter
1060  *
1061  * Called by the system to transmit a packet  - we queue the packet in
1062  * EMAC hardware transmit queue
1063  *
1064  * Returns success(NETDEV_TX_OK) or error code (typically out of desc's)
1065  */
1066 static int emac_dev_xmit(struct sk_buff *skb, struct net_device *ndev)
1067 {
1068         struct device *emac_dev = &ndev->dev;
1069         int ret_code;
1070         struct emac_priv *priv = netdev_priv(ndev);
1071
1072         /* If no link, return */
1073         if (unlikely(!priv->link)) {
1074                 if (netif_msg_tx_err(priv) && net_ratelimit())
1075                         dev_err(emac_dev, "DaVinci EMAC: No link to transmit");
1076                 goto fail_tx;
1077         }
1078
1079         ret_code = skb_padto(skb, EMAC_DEF_MIN_ETHPKTSIZE);
1080         if (unlikely(ret_code < 0)) {
1081                 if (netif_msg_tx_err(priv) && net_ratelimit())
1082                         dev_err(emac_dev, "DaVinci EMAC: packet pad failed");
1083                 goto fail_tx;
1084         }
1085
1086         ret_code = cpdma_chan_submit(priv->txchan, skb, skb->data, skb->len,
1087                                      GFP_KERNEL);
1088         if (unlikely(ret_code != 0)) {
1089                 if (netif_msg_tx_err(priv) && net_ratelimit())
1090                         dev_err(emac_dev, "DaVinci EMAC: desc submit failed");
1091                 goto fail_tx;
1092         }
1093
1094         return NETDEV_TX_OK;
1095
1096 fail_tx:
1097         ndev->stats.tx_dropped++;
1098         netif_stop_queue(ndev);
1099         return NETDEV_TX_BUSY;
1100 }
1101
1102 /**
1103  * emac_dev_tx_timeout: EMAC Transmit timeout function
1104  * @ndev: The DaVinci EMAC network adapter
1105  *
1106  * Called when system detects that a skb timeout period has expired
1107  * potentially due to a fault in the adapter in not being able to send
1108  * it out on the wire. We teardown the TX channel assuming a hardware
1109  * error and re-initialize the TX channel for hardware operation
1110  *
1111  */
1112 static void emac_dev_tx_timeout(struct net_device *ndev)
1113 {
1114         struct emac_priv *priv = netdev_priv(ndev);
1115         struct device *emac_dev = &ndev->dev;
1116
1117         if (netif_msg_tx_err(priv))
1118                 dev_err(emac_dev, "DaVinci EMAC: xmit timeout, restarting TX");
1119
1120         emac_dump_regs(priv);
1121
1122         ndev->stats.tx_errors++;
1123         emac_int_disable(priv);
1124         cpdma_chan_stop(priv->txchan);
1125         cpdma_chan_start(priv->txchan);
1126         emac_int_enable(priv);
1127 }
1128
1129 /**
1130  * emac_set_type0addr: Set EMAC Type0 mac address
1131  * @priv: The DaVinci EMAC private adapter structure
1132  * @ch: RX channel number
1133  * @mac_addr: MAC address to set in device
1134  *
1135  * Called internally to set Type0 mac address of the adapter (Device)
1136  *
1137  * Returns success (0) or appropriate error code (none as of now)
1138  */
1139 static void emac_set_type0addr(struct emac_priv *priv, u32 ch, char *mac_addr)
1140 {
1141         u32 val;
1142         val = ((mac_addr[5] << 8) | (mac_addr[4]));
1143         emac_write(EMAC_MACSRCADDRLO, val);
1144
1145         val = ((mac_addr[3] << 24) | (mac_addr[2] << 16) | \
1146                (mac_addr[1] << 8) | (mac_addr[0]));
1147         emac_write(EMAC_MACSRCADDRHI, val);
1148         val = emac_read(EMAC_RXUNICASTSET);
1149         val |= BIT(ch);
1150         emac_write(EMAC_RXUNICASTSET, val);
1151         val = emac_read(EMAC_RXUNICASTCLEAR);
1152         val &= ~BIT(ch);
1153         emac_write(EMAC_RXUNICASTCLEAR, val);
1154 }
1155
1156 /**
1157  * emac_set_type1addr: Set EMAC Type1 mac address
1158  * @priv: The DaVinci EMAC private adapter structure
1159  * @ch: RX channel number
1160  * @mac_addr: MAC address to set in device
1161  *
1162  * Called internally to set Type1 mac address of the adapter (Device)
1163  *
1164  * Returns success (0) or appropriate error code (none as of now)
1165  */
1166 static void emac_set_type1addr(struct emac_priv *priv, u32 ch, char *mac_addr)
1167 {
1168         u32 val;
1169         emac_write(EMAC_MACINDEX, ch);
1170         val = ((mac_addr[5] << 8) | mac_addr[4]);
1171         emac_write(EMAC_MACADDRLO, val);
1172         val = ((mac_addr[3] << 24) | (mac_addr[2] << 16) | \
1173                (mac_addr[1] << 8) | (mac_addr[0]));
1174         emac_write(EMAC_MACADDRHI, val);
1175         emac_set_type0addr(priv, ch, mac_addr);
1176 }
1177
1178 /**
1179  * emac_set_type2addr: Set EMAC Type2 mac address
1180  * @priv: The DaVinci EMAC private adapter structure
1181  * @ch: RX channel number
1182  * @mac_addr: MAC address to set in device
1183  * @index: index into RX address entries
1184  * @match: match parameter for RX address matching logic
1185  *
1186  * Called internally to set Type2 mac address of the adapter (Device)
1187  *
1188  * Returns success (0) or appropriate error code (none as of now)
1189  */
1190 static void emac_set_type2addr(struct emac_priv *priv, u32 ch,
1191                                char *mac_addr, int index, int match)
1192 {
1193         u32 val;
1194         emac_write(EMAC_MACINDEX, index);
1195         val = ((mac_addr[3] << 24) | (mac_addr[2] << 16) | \
1196                (mac_addr[1] << 8) | (mac_addr[0]));
1197         emac_write(EMAC_MACADDRHI, val);
1198         val = ((mac_addr[5] << 8) | mac_addr[4] | ((ch & 0x7) << 16) | \
1199                (match << 19) | BIT(20));
1200         emac_write(EMAC_MACADDRLO, val);
1201         emac_set_type0addr(priv, ch, mac_addr);
1202 }
1203
1204 /**
1205  * emac_setmac: Set mac address in the adapter (internal function)
1206  * @priv: The DaVinci EMAC private adapter structure
1207  * @ch: RX channel number
1208  * @mac_addr: MAC address to set in device
1209  *
1210  * Called internally to set the mac address of the adapter (Device)
1211  *
1212  * Returns success (0) or appropriate error code (none as of now)
1213  */
1214 static void emac_setmac(struct emac_priv *priv, u32 ch, char *mac_addr)
1215 {
1216         struct device *emac_dev = &priv->ndev->dev;
1217
1218         if (priv->rx_addr_type == 0) {
1219                 emac_set_type0addr(priv, ch, mac_addr);
1220         } else if (priv->rx_addr_type == 1) {
1221                 u32 cnt;
1222                 for (cnt = 0; cnt < EMAC_MAX_TXRX_CHANNELS; cnt++)
1223                         emac_set_type1addr(priv, ch, mac_addr);
1224         } else if (priv->rx_addr_type == 2) {
1225                 emac_set_type2addr(priv, ch, mac_addr, ch, 1);
1226                 emac_set_type0addr(priv, ch, mac_addr);
1227         } else {
1228                 if (netif_msg_drv(priv))
1229                         dev_err(emac_dev, "DaVinci EMAC: Wrong addressing\n");
1230         }
1231 }
1232
1233 /**
1234  * emac_dev_setmac_addr: Set mac address in the adapter
1235  * @ndev: The DaVinci EMAC network adapter
1236  * @addr: MAC address to set in device
1237  *
1238  * Called by the system to set the mac address of the adapter (Device)
1239  *
1240  * Returns success (0) or appropriate error code (none as of now)
1241  */
1242 static int emac_dev_setmac_addr(struct net_device *ndev, void *addr)
1243 {
1244         struct emac_priv *priv = netdev_priv(ndev);
1245         struct device *emac_dev = &priv->ndev->dev;
1246         struct sockaddr *sa = addr;
1247
1248         if (!is_valid_ether_addr(sa->sa_data))
1249                 return -EINVAL;
1250
1251         /* Store mac addr in priv and rx channel and set it in EMAC hw */
1252         memcpy(priv->mac_addr, sa->sa_data, ndev->addr_len);
1253         memcpy(ndev->dev_addr, sa->sa_data, ndev->addr_len);
1254
1255         /* MAC address is configured only after the interface is enabled. */
1256         if (netif_running(ndev)) {
1257                 memcpy(priv->mac_addr, sa->sa_data, ndev->addr_len);
1258                 emac_setmac(priv, EMAC_DEF_RX_CH, priv->mac_addr);
1259         }
1260
1261         if (netif_msg_drv(priv))
1262                 dev_notice(emac_dev, "DaVinci EMAC: emac_dev_setmac_addr %pM\n",
1263                                         priv->mac_addr);
1264
1265         return 0;
1266 }
1267
1268 /**
1269  * emac_hw_enable: Enable EMAC hardware for packet transmission/reception
1270  * @priv: The DaVinci EMAC private adapter structure
1271  *
1272  * Enables EMAC hardware for packet processing - enables PHY, enables RX
1273  * for packet reception and enables device interrupts and then NAPI
1274  *
1275  * Returns success (0) or appropriate error code (none right now)
1276  */
1277 static int emac_hw_enable(struct emac_priv *priv)
1278 {
1279         u32 val, mbp_enable, mac_control;
1280
1281         /* Soft reset */
1282         emac_write(EMAC_SOFTRESET, 1);
1283         while (emac_read(EMAC_SOFTRESET))
1284                 cpu_relax();
1285
1286         /* Disable interrupt & Set pacing for more interrupts initially */
1287         emac_int_disable(priv);
1288
1289         /* Full duplex enable bit set when auto negotiation happens */
1290         mac_control =
1291                 (((EMAC_DEF_TXPRIO_FIXED) ? (EMAC_MACCONTROL_TXPTYPE) : 0x0) |
1292                 ((priv->speed == 1000) ? EMAC_MACCONTROL_GIGABITEN : 0x0) |
1293                 ((EMAC_DEF_TXPACING_EN) ? (EMAC_MACCONTROL_TXPACEEN) : 0x0) |
1294                 ((priv->duplex == DUPLEX_FULL) ? 0x1 : 0));
1295         emac_write(EMAC_MACCONTROL, mac_control);
1296
1297         mbp_enable =
1298                 (((EMAC_DEF_PASS_CRC) ? (EMAC_RXMBP_PASSCRC_MASK) : 0x0) |
1299                 ((EMAC_DEF_QOS_EN) ? (EMAC_RXMBP_QOSEN_MASK) : 0x0) |
1300                  ((EMAC_DEF_NO_BUFF_CHAIN) ? (EMAC_RXMBP_NOCHAIN_MASK) : 0x0) |
1301                  ((EMAC_DEF_MACCTRL_FRAME_EN) ? (EMAC_RXMBP_CMFEN_MASK) : 0x0) |
1302                  ((EMAC_DEF_SHORT_FRAME_EN) ? (EMAC_RXMBP_CSFEN_MASK) : 0x0) |
1303                  ((EMAC_DEF_ERROR_FRAME_EN) ? (EMAC_RXMBP_CEFEN_MASK) : 0x0) |
1304                  ((EMAC_DEF_PROM_EN) ? (EMAC_RXMBP_CAFEN_MASK) : 0x0) |
1305                  ((EMAC_DEF_PROM_CH & EMAC_RXMBP_CHMASK) << \
1306                         EMAC_RXMBP_PROMCH_SHIFT) |
1307                  ((EMAC_DEF_BCAST_EN) ? (EMAC_RXMBP_BROADEN_MASK) : 0x0) |
1308                  ((EMAC_DEF_BCAST_CH & EMAC_RXMBP_CHMASK) << \
1309                         EMAC_RXMBP_BROADCH_SHIFT) |
1310                  ((EMAC_DEF_MCAST_EN) ? (EMAC_RXMBP_MULTIEN_MASK) : 0x0) |
1311                  ((EMAC_DEF_MCAST_CH & EMAC_RXMBP_CHMASK) << \
1312                         EMAC_RXMBP_MULTICH_SHIFT));
1313         emac_write(EMAC_RXMBPENABLE, mbp_enable);
1314         emac_write(EMAC_RXMAXLEN, (EMAC_DEF_MAX_FRAME_SIZE &
1315                                    EMAC_RX_MAX_LEN_MASK));
1316         emac_write(EMAC_RXBUFFEROFFSET, (EMAC_DEF_BUFFER_OFFSET &
1317                                          EMAC_RX_BUFFER_OFFSET_MASK));
1318         emac_write(EMAC_RXFILTERLOWTHRESH, 0);
1319         emac_write(EMAC_RXUNICASTCLEAR, EMAC_RX_UNICAST_CLEAR_ALL);
1320         priv->rx_addr_type = (emac_read(EMAC_MACCONFIG) >> 8) & 0xFF;
1321
1322         emac_write(EMAC_MACINTMASKSET, EMAC_MAC_HOST_ERR_INTMASK_VAL);
1323
1324         emac_setmac(priv, EMAC_DEF_RX_CH, priv->mac_addr);
1325
1326         /* Enable MII */
1327         val = emac_read(EMAC_MACCONTROL);
1328         val |= (EMAC_MACCONTROL_GMIIEN);
1329         emac_write(EMAC_MACCONTROL, val);
1330
1331         /* Enable NAPI and interrupts */
1332         napi_enable(&priv->napi);
1333         emac_int_enable(priv);
1334         return 0;
1335
1336 }
1337
1338 /**
1339  * emac_poll: EMAC NAPI Poll function
1340  * @ndev: The DaVinci EMAC network adapter
1341  * @budget: Number of receive packets to process (as told by NAPI layer)
1342  *
1343  * NAPI Poll function implemented to process packets as per budget. We check
1344  * the type of interrupt on the device and accordingly call the TX or RX
1345  * packet processing functions. We follow the budget for RX processing and
1346  * also put a cap on number of TX pkts processed through config param. The
1347  * NAPI schedule function is called if more packets pending.
1348  *
1349  * Returns number of packets received (in most cases; else TX pkts - rarely)
1350  */
1351 static int emac_poll(struct napi_struct *napi, int budget)
1352 {
1353         unsigned int mask;
1354         struct emac_priv *priv = container_of(napi, struct emac_priv, napi);
1355         struct net_device *ndev = priv->ndev;
1356         struct device *emac_dev = &ndev->dev;
1357         u32 status = 0;
1358         u32 num_tx_pkts = 0, num_rx_pkts = 0;
1359
1360         /* Check interrupt vectors and call packet processing */
1361         status = emac_read(EMAC_MACINVECTOR);
1362
1363         mask = EMAC_DM644X_MAC_IN_VECTOR_TX_INT_VEC;
1364
1365         if (priv->version == EMAC_VERSION_2)
1366                 mask = EMAC_DM646X_MAC_IN_VECTOR_TX_INT_VEC;
1367
1368         if (status & mask) {
1369                 num_tx_pkts = cpdma_chan_process(priv->txchan,
1370                                               EMAC_DEF_TX_MAX_SERVICE);
1371         } /* TX processing */
1372
1373         mask = EMAC_DM644X_MAC_IN_VECTOR_RX_INT_VEC;
1374
1375         if (priv->version == EMAC_VERSION_2)
1376                 mask = EMAC_DM646X_MAC_IN_VECTOR_RX_INT_VEC;
1377
1378         if (status & mask) {
1379                 num_rx_pkts = cpdma_chan_process(priv->rxchan, budget);
1380         } /* RX processing */
1381
1382         mask = EMAC_DM644X_MAC_IN_VECTOR_HOST_INT;
1383         if (priv->version == EMAC_VERSION_2)
1384                 mask = EMAC_DM646X_MAC_IN_VECTOR_HOST_INT;
1385
1386         if (unlikely(status & mask)) {
1387                 u32 ch, cause;
1388                 dev_err(emac_dev, "DaVinci EMAC: Fatal Hardware Error\n");
1389                 netif_stop_queue(ndev);
1390                 napi_disable(&priv->napi);
1391
1392                 status = emac_read(EMAC_MACSTATUS);
1393                 cause = ((status & EMAC_MACSTATUS_TXERRCODE_MASK) >>
1394                          EMAC_MACSTATUS_TXERRCODE_SHIFT);
1395                 if (cause) {
1396                         ch = ((status & EMAC_MACSTATUS_TXERRCH_MASK) >>
1397                               EMAC_MACSTATUS_TXERRCH_SHIFT);
1398                         if (net_ratelimit()) {
1399                                 dev_err(emac_dev, "TX Host error %s on ch=%d\n",
1400                                         &emac_txhost_errcodes[cause][0], ch);
1401                         }
1402                 }
1403                 cause = ((status & EMAC_MACSTATUS_RXERRCODE_MASK) >>
1404                          EMAC_MACSTATUS_RXERRCODE_SHIFT);
1405                 if (cause) {
1406                         ch = ((status & EMAC_MACSTATUS_RXERRCH_MASK) >>
1407                               EMAC_MACSTATUS_RXERRCH_SHIFT);
1408                         if (netif_msg_hw(priv) && net_ratelimit())
1409                                 dev_err(emac_dev, "RX Host error %s on ch=%d\n",
1410                                         &emac_rxhost_errcodes[cause][0], ch);
1411                 }
1412         } else if (num_rx_pkts < budget) {
1413                 napi_complete(napi);
1414                 emac_int_enable(priv);
1415         }
1416
1417         return num_rx_pkts;
1418 }
1419
1420 #ifdef CONFIG_NET_POLL_CONTROLLER
1421 /**
1422  * emac_poll_controller: EMAC Poll controller function
1423  * @ndev: The DaVinci EMAC network adapter
1424  *
1425  * Polled functionality used by netconsole and others in non interrupt mode
1426  *
1427  */
1428 void emac_poll_controller(struct net_device *ndev)
1429 {
1430         struct emac_priv *priv = netdev_priv(ndev);
1431
1432         emac_int_disable(priv);
1433         emac_irq(ndev->irq, ndev);
1434         emac_int_enable(priv);
1435 }
1436 #endif
1437
1438 static void emac_adjust_link(struct net_device *ndev)
1439 {
1440         struct emac_priv *priv = netdev_priv(ndev);
1441         struct phy_device *phydev = priv->phydev;
1442         unsigned long flags;
1443         int new_state = 0;
1444
1445         spin_lock_irqsave(&priv->lock, flags);
1446
1447         if (phydev->link) {
1448                 /* check the mode of operation - full/half duplex */
1449                 if (phydev->duplex != priv->duplex) {
1450                         new_state = 1;
1451                         priv->duplex = phydev->duplex;
1452                 }
1453                 if (phydev->speed != priv->speed) {
1454                         new_state = 1;
1455                         priv->speed = phydev->speed;
1456                 }
1457                 if (!priv->link) {
1458                         new_state = 1;
1459                         priv->link = 1;
1460                 }
1461
1462         } else if (priv->link) {
1463                 new_state = 1;
1464                 priv->link = 0;
1465                 priv->speed = 0;
1466                 priv->duplex = ~0;
1467         }
1468         if (new_state) {
1469                 emac_update_phystatus(priv);
1470                 phy_print_status(priv->phydev);
1471         }
1472
1473         spin_unlock_irqrestore(&priv->lock, flags);
1474 }
1475
1476 /*************************************************************************
1477  *  Linux Driver Model
1478  *************************************************************************/
1479
1480 /**
1481  * emac_devioctl: EMAC adapter ioctl
1482  * @ndev: The DaVinci EMAC network adapter
1483  * @ifrq: request parameter
1484  * @cmd: command parameter
1485  *
1486  * EMAC driver ioctl function
1487  *
1488  * Returns success(0) or appropriate error code
1489  */
1490 static int emac_devioctl(struct net_device *ndev, struct ifreq *ifrq, int cmd)
1491 {
1492         dev_warn(&ndev->dev, "DaVinci EMAC: ioctl not supported\n");
1493
1494         if (!(netif_running(ndev)))
1495                 return -EINVAL;
1496
1497         /* TODO: Add phy read and write and private statistics get feature */
1498
1499         return -EOPNOTSUPP;
1500 }
1501
1502 static int match_first_device(struct device *dev, void *data)
1503 {
1504         return 1;
1505 }
1506
1507 /**
1508  * emac_dev_open: EMAC device open
1509  * @ndev: The DaVinci EMAC network adapter
1510  *
1511  * Called when system wants to start the interface. We init TX/RX channels
1512  * and enable the hardware for packet reception/transmission and start the
1513  * network queue.
1514  *
1515  * Returns 0 for a successful open, or appropriate error code
1516  */
1517 static int emac_dev_open(struct net_device *ndev)
1518 {
1519         struct device *emac_dev = &ndev->dev;
1520         u32 cnt;
1521         struct resource *res;
1522         int q, m, ret;
1523         int i = 0;
1524         int k = 0;
1525         struct emac_priv *priv = netdev_priv(ndev);
1526
1527         netif_carrier_off(ndev);
1528         for (cnt = 0; cnt < ETH_ALEN; cnt++)
1529                 ndev->dev_addr[cnt] = priv->mac_addr[cnt];
1530
1531         /* Configuration items */
1532         priv->rx_buf_size = EMAC_DEF_MAX_FRAME_SIZE + NET_IP_ALIGN;
1533
1534         priv->mac_hash1 = 0;
1535         priv->mac_hash2 = 0;
1536         emac_write(EMAC_MACHASH1, 0);
1537         emac_write(EMAC_MACHASH2, 0);
1538
1539         for (i = 0; i < EMAC_DEF_RX_NUM_DESC; i++) {
1540                 struct sk_buff *skb = emac_rx_alloc(priv);
1541
1542                 if (!skb)
1543                         break;
1544
1545                 ret = cpdma_chan_submit(priv->rxchan, skb, skb->data,
1546                                         skb_tailroom(skb), GFP_KERNEL);
1547                 if (WARN_ON(ret < 0))
1548                         break;
1549         }
1550
1551         /* Request IRQ */
1552
1553         while ((res = platform_get_resource(priv->pdev, IORESOURCE_IRQ, k))) {
1554                 for (i = res->start; i <= res->end; i++) {
1555                         if (request_irq(i, emac_irq, IRQF_DISABLED,
1556                                         ndev->name, ndev))
1557                                 goto rollback;
1558                 }
1559                 k++;
1560         }
1561
1562         /* Start/Enable EMAC hardware */
1563         emac_hw_enable(priv);
1564
1565         /* Enable Interrupt pacing if configured */
1566         if (priv->coal_intvl != 0) {
1567                 struct ethtool_coalesce coal;
1568
1569                 coal.rx_coalesce_usecs = (priv->coal_intvl << 4);
1570                 emac_set_coalesce(ndev, &coal);
1571         }
1572
1573         cpdma_ctlr_start(priv->dma);
1574
1575         priv->phydev = NULL;
1576         /* use the first phy on the bus if pdata did not give us a phy id */
1577         if (!priv->phy_id) {
1578                 struct device *phy;
1579
1580                 phy = bus_find_device(&mdio_bus_type, NULL, NULL,
1581                                       match_first_device);
1582                 if (phy)
1583                         priv->phy_id = dev_name(phy);
1584         }
1585
1586         if (priv->phy_id && *priv->phy_id) {
1587                 priv->phydev = phy_connect(ndev, priv->phy_id,
1588                                            &emac_adjust_link, 0,
1589                                            PHY_INTERFACE_MODE_MII);
1590
1591                 if (IS_ERR(priv->phydev)) {
1592                         dev_err(emac_dev, "could not connect to phy %s\n",
1593                                 priv->phy_id);
1594                         priv->phydev = NULL;
1595                         return PTR_ERR(priv->phydev);
1596                 }
1597
1598                 priv->link = 0;
1599                 priv->speed = 0;
1600                 priv->duplex = ~0;
1601
1602                 dev_info(emac_dev, "attached PHY driver [%s] "
1603                         "(mii_bus:phy_addr=%s, id=%x)\n",
1604                         priv->phydev->drv->name, dev_name(&priv->phydev->dev),
1605                         priv->phydev->phy_id);
1606         } else {
1607                 /* No PHY , fix the link, speed and duplex settings */
1608                 dev_notice(emac_dev, "no phy, defaulting to 100/full\n");
1609                 priv->link = 1;
1610                 priv->speed = SPEED_100;
1611                 priv->duplex = DUPLEX_FULL;
1612                 emac_update_phystatus(priv);
1613         }
1614
1615         if (!netif_running(ndev)) /* debug only - to avoid compiler warning */
1616                 emac_dump_regs(priv);
1617
1618         if (netif_msg_drv(priv))
1619                 dev_notice(emac_dev, "DaVinci EMAC: Opened %s\n", ndev->name);
1620
1621         if (priv->phydev)
1622                 phy_start(priv->phydev);
1623
1624         return 0;
1625
1626 rollback:
1627
1628         dev_err(emac_dev, "DaVinci EMAC: request_irq() failed");
1629
1630         for (q = k; k >= 0; k--) {
1631                 for (m = i; m >= res->start; m--)
1632                         free_irq(m, ndev);
1633                 res = platform_get_resource(priv->pdev, IORESOURCE_IRQ, k-1);
1634                 m = res->end;
1635         }
1636         return -EBUSY;
1637 }
1638
1639 /**
1640  * emac_dev_stop: EMAC device stop
1641  * @ndev: The DaVinci EMAC network adapter
1642  *
1643  * Called when system wants to stop or down the interface. We stop the network
1644  * queue, disable interrupts and cleanup TX/RX channels.
1645  *
1646  * We return the statistics in net_device_stats structure pulled from emac
1647  */
1648 static int emac_dev_stop(struct net_device *ndev)
1649 {
1650         struct resource *res;
1651         int i = 0;
1652         int irq_num;
1653         struct emac_priv *priv = netdev_priv(ndev);
1654         struct device *emac_dev = &ndev->dev;
1655
1656         /* inform the upper layers. */
1657         netif_stop_queue(ndev);
1658         napi_disable(&priv->napi);
1659
1660         netif_carrier_off(ndev);
1661         emac_int_disable(priv);
1662         cpdma_ctlr_stop(priv->dma);
1663         emac_write(EMAC_SOFTRESET, 1);
1664
1665         if (priv->phydev)
1666                 phy_disconnect(priv->phydev);
1667
1668         /* Free IRQ */
1669         while ((res = platform_get_resource(priv->pdev, IORESOURCE_IRQ, i))) {
1670                 for (irq_num = res->start; irq_num <= res->end; irq_num++)
1671                         free_irq(irq_num, priv->ndev);
1672                 i++;
1673         }
1674
1675         if (netif_msg_drv(priv))
1676                 dev_notice(emac_dev, "DaVinci EMAC: %s stopped\n", ndev->name);
1677
1678         return 0;
1679 }
1680
1681 /**
1682  * emac_dev_getnetstats: EMAC get statistics function
1683  * @ndev: The DaVinci EMAC network adapter
1684  *
1685  * Called when system wants to get statistics from the device.
1686  *
1687  * We return the statistics in net_device_stats structure pulled from emac
1688  */
1689 static struct net_device_stats *emac_dev_getnetstats(struct net_device *ndev)
1690 {
1691         struct emac_priv *priv = netdev_priv(ndev);
1692         u32 mac_control;
1693         u32 stats_clear_mask;
1694
1695         /* update emac hardware stats and reset the registers*/
1696
1697         mac_control = emac_read(EMAC_MACCONTROL);
1698
1699         if (mac_control & EMAC_MACCONTROL_GMIIEN)
1700                 stats_clear_mask = EMAC_STATS_CLR_MASK;
1701         else
1702                 stats_clear_mask = 0;
1703
1704         ndev->stats.multicast += emac_read(EMAC_RXMCASTFRAMES);
1705         emac_write(EMAC_RXMCASTFRAMES, stats_clear_mask);
1706
1707         ndev->stats.collisions += (emac_read(EMAC_TXCOLLISION) +
1708                                            emac_read(EMAC_TXSINGLECOLL) +
1709                                            emac_read(EMAC_TXMULTICOLL));
1710         emac_write(EMAC_TXCOLLISION, stats_clear_mask);
1711         emac_write(EMAC_TXSINGLECOLL, stats_clear_mask);
1712         emac_write(EMAC_TXMULTICOLL, stats_clear_mask);
1713
1714         ndev->stats.rx_length_errors += (emac_read(EMAC_RXOVERSIZED) +
1715                                                 emac_read(EMAC_RXJABBER) +
1716                                                 emac_read(EMAC_RXUNDERSIZED));
1717         emac_write(EMAC_RXOVERSIZED, stats_clear_mask);
1718         emac_write(EMAC_RXJABBER, stats_clear_mask);
1719         emac_write(EMAC_RXUNDERSIZED, stats_clear_mask);
1720
1721         ndev->stats.rx_over_errors += (emac_read(EMAC_RXSOFOVERRUNS) +
1722                                                emac_read(EMAC_RXMOFOVERRUNS));
1723         emac_write(EMAC_RXSOFOVERRUNS, stats_clear_mask);
1724         emac_write(EMAC_RXMOFOVERRUNS, stats_clear_mask);
1725
1726         ndev->stats.rx_fifo_errors += emac_read(EMAC_RXDMAOVERRUNS);
1727         emac_write(EMAC_RXDMAOVERRUNS, stats_clear_mask);
1728
1729         ndev->stats.tx_carrier_errors +=
1730                 emac_read(EMAC_TXCARRIERSENSE);
1731         emac_write(EMAC_TXCARRIERSENSE, stats_clear_mask);
1732
1733         ndev->stats.tx_fifo_errors = emac_read(EMAC_TXUNDERRUN);
1734         emac_write(EMAC_TXUNDERRUN, stats_clear_mask);
1735
1736         return &ndev->stats;
1737 }
1738
1739 static const struct net_device_ops emac_netdev_ops = {
1740         .ndo_open               = emac_dev_open,
1741         .ndo_stop               = emac_dev_stop,
1742         .ndo_start_xmit         = emac_dev_xmit,
1743         .ndo_set_multicast_list = emac_dev_mcast_set,
1744         .ndo_set_mac_address    = emac_dev_setmac_addr,
1745         .ndo_do_ioctl           = emac_devioctl,
1746         .ndo_tx_timeout         = emac_dev_tx_timeout,
1747         .ndo_get_stats          = emac_dev_getnetstats,
1748 #ifdef CONFIG_NET_POLL_CONTROLLER
1749         .ndo_poll_controller    = emac_poll_controller,
1750 #endif
1751 };
1752
1753 /**
1754  * davinci_emac_probe: EMAC device probe
1755  * @pdev: The DaVinci EMAC device that we are removing
1756  *
1757  * Called when probing for emac devicesr. We get details of instances and
1758  * resource information from platform init and register a network device
1759  * and allocate resources necessary for driver to perform
1760  */
1761 static int __devinit davinci_emac_probe(struct platform_device *pdev)
1762 {
1763         int rc = 0;
1764         struct resource *res;
1765         struct net_device *ndev;
1766         struct emac_priv *priv;
1767         unsigned long size, hw_ram_addr;
1768         struct emac_platform_data *pdata;
1769         struct device *emac_dev;
1770         struct cpdma_params dma_params;
1771
1772         /* obtain emac clock from kernel */
1773         emac_clk = clk_get(&pdev->dev, NULL);
1774         if (IS_ERR(emac_clk)) {
1775                 printk(KERN_ERR "DaVinci EMAC: Failed to get EMAC clock\n");
1776                 return -EBUSY;
1777         }
1778         emac_bus_frequency = clk_get_rate(emac_clk);
1779         /* TODO: Probe PHY here if possible */
1780
1781         ndev = alloc_etherdev(sizeof(struct emac_priv));
1782         if (!ndev) {
1783                 printk(KERN_ERR "DaVinci EMAC: Error allocating net_device\n");
1784                 clk_put(emac_clk);
1785                 return -ENOMEM;
1786         }
1787
1788         platform_set_drvdata(pdev, ndev);
1789         priv = netdev_priv(ndev);
1790         priv->pdev = pdev;
1791         priv->ndev = ndev;
1792         priv->msg_enable = netif_msg_init(debug_level, DAVINCI_EMAC_DEBUG);
1793
1794         spin_lock_init(&priv->lock);
1795
1796         pdata = pdev->dev.platform_data;
1797         if (!pdata) {
1798                 printk(KERN_ERR "DaVinci EMAC: No platform data\n");
1799                 return -ENODEV;
1800         }
1801
1802         /* MAC addr and PHY mask , RMII enable info from platform_data */
1803         memcpy(priv->mac_addr, pdata->mac_addr, 6);
1804         priv->phy_id = pdata->phy_id;
1805         priv->rmii_en = pdata->rmii_en;
1806         priv->version = pdata->version;
1807         priv->int_enable = pdata->interrupt_enable;
1808         priv->int_disable = pdata->interrupt_disable;
1809
1810         priv->coal_intvl = 0;
1811         priv->bus_freq_mhz = (u32)(emac_bus_frequency / 1000000);
1812
1813         emac_dev = &ndev->dev;
1814         /* Get EMAC platform data */
1815         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1816         if (!res) {
1817                 dev_err(emac_dev, "DaVinci EMAC: Error getting res\n");
1818                 rc = -ENOENT;
1819                 goto probe_quit;
1820         }
1821
1822         priv->emac_base_phys = res->start + pdata->ctrl_reg_offset;
1823         size = res->end - res->start + 1;
1824         if (!request_mem_region(res->start, size, ndev->name)) {
1825                 dev_err(emac_dev, "DaVinci EMAC: failed request_mem_region() for regs\n");
1826                 rc = -ENXIO;
1827                 goto probe_quit;
1828         }
1829
1830         priv->remap_addr = ioremap(res->start, size);
1831         if (!priv->remap_addr) {
1832                 dev_err(emac_dev, "Unable to map IO\n");
1833                 rc = -ENOMEM;
1834                 release_mem_region(res->start, size);
1835                 goto probe_quit;
1836         }
1837         priv->emac_base = priv->remap_addr + pdata->ctrl_reg_offset;
1838         ndev->base_addr = (unsigned long)priv->remap_addr;
1839
1840         priv->ctrl_base = priv->remap_addr + pdata->ctrl_mod_reg_offset;
1841
1842         hw_ram_addr = pdata->hw_ram_addr;
1843         if (!hw_ram_addr)
1844                 hw_ram_addr = (u32 __force)res->start + pdata->ctrl_ram_offset;
1845
1846         memset(&dma_params, 0, sizeof(dma_params));
1847         dma_params.dev                  = emac_dev;
1848         dma_params.dmaregs              = priv->emac_base;
1849         dma_params.rxthresh             = priv->emac_base + 0x120;
1850         dma_params.rxfree               = priv->emac_base + 0x140;
1851         dma_params.txhdp                = priv->emac_base + 0x600;
1852         dma_params.rxhdp                = priv->emac_base + 0x620;
1853         dma_params.txcp                 = priv->emac_base + 0x640;
1854         dma_params.rxcp                 = priv->emac_base + 0x660;
1855         dma_params.num_chan             = EMAC_MAX_TXRX_CHANNELS;
1856         dma_params.min_packet_size      = EMAC_DEF_MIN_ETHPKTSIZE;
1857         dma_params.desc_mem_phys        = hw_ram_addr;
1858         dma_params.desc_mem_size        = pdata->ctrl_ram_size;
1859         dma_params.desc_align           = 16;
1860
1861         priv->dma = cpdma_ctlr_create(&dma_params);
1862         if (!priv->dma) {
1863                 dev_err(emac_dev, "DaVinci EMAC: Error initializing DMA\n");
1864                 rc = -ENOMEM;
1865                 goto no_dma;
1866         }
1867
1868         priv->txchan = cpdma_chan_create(priv->dma, tx_chan_num(EMAC_DEF_TX_CH),
1869                                        emac_tx_handler);
1870         priv->rxchan = cpdma_chan_create(priv->dma, rx_chan_num(EMAC_DEF_RX_CH),
1871                                        emac_rx_handler);
1872         if (WARN_ON(!priv->txchan || !priv->rxchan)) {
1873                 rc = -ENOMEM;
1874                 goto no_irq_res;
1875         }
1876
1877         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1878         if (!res) {
1879                 dev_err(emac_dev, "DaVinci EMAC: Error getting irq res\n");
1880                 rc = -ENOENT;
1881                 goto no_irq_res;
1882         }
1883         ndev->irq = res->start;
1884
1885         if (!is_valid_ether_addr(priv->mac_addr)) {
1886                 /* Use random MAC if none passed */
1887                 random_ether_addr(priv->mac_addr);
1888                 printk(KERN_WARNING "%s: using random MAC addr: %pM\n",
1889                                 __func__, priv->mac_addr);
1890         }
1891
1892         ndev->netdev_ops = &emac_netdev_ops;
1893         SET_ETHTOOL_OPS(ndev, &ethtool_ops);
1894         netif_napi_add(ndev, &priv->napi, emac_poll, EMAC_POLL_WEIGHT);
1895
1896         clk_enable(emac_clk);
1897
1898         /* register the network device */
1899         SET_NETDEV_DEV(ndev, &pdev->dev);
1900         rc = register_netdev(ndev);
1901         if (rc) {
1902                 dev_err(emac_dev, "DaVinci EMAC: Error in register_netdev\n");
1903                 rc = -ENODEV;
1904                 goto netdev_reg_err;
1905         }
1906
1907
1908         if (netif_msg_probe(priv)) {
1909                 dev_notice(emac_dev, "DaVinci EMAC Probe found device "\
1910                            "(regs: %p, irq: %d)\n",
1911                            (void *)priv->emac_base_phys, ndev->irq);
1912         }
1913         return 0;
1914
1915 netdev_reg_err:
1916         clk_disable(emac_clk);
1917 no_irq_res:
1918         if (priv->txchan)
1919                 cpdma_chan_destroy(priv->txchan);
1920         if (priv->rxchan)
1921                 cpdma_chan_destroy(priv->rxchan);
1922         cpdma_ctlr_destroy(priv->dma);
1923 no_dma:
1924         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1925         release_mem_region(res->start, res->end - res->start + 1);
1926         iounmap(priv->remap_addr);
1927
1928 probe_quit:
1929         clk_put(emac_clk);
1930         free_netdev(ndev);
1931         return rc;
1932 }
1933
1934 /**
1935  * davinci_emac_remove: EMAC device remove
1936  * @pdev: The DaVinci EMAC device that we are removing
1937  *
1938  * Called when removing the device driver. We disable clock usage and release
1939  * the resources taken up by the driver and unregister network device
1940  */
1941 static int __devexit davinci_emac_remove(struct platform_device *pdev)
1942 {
1943         struct resource *res;
1944         struct net_device *ndev = platform_get_drvdata(pdev);
1945         struct emac_priv *priv = netdev_priv(ndev);
1946
1947         dev_notice(&ndev->dev, "DaVinci EMAC: davinci_emac_remove()\n");
1948
1949         platform_set_drvdata(pdev, NULL);
1950         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1951
1952         if (priv->txchan)
1953                 cpdma_chan_destroy(priv->txchan);
1954         if (priv->rxchan)
1955                 cpdma_chan_destroy(priv->rxchan);
1956         cpdma_ctlr_destroy(priv->dma);
1957
1958         release_mem_region(res->start, res->end - res->start + 1);
1959
1960         unregister_netdev(ndev);
1961         iounmap(priv->remap_addr);
1962         free_netdev(ndev);
1963
1964         clk_disable(emac_clk);
1965         clk_put(emac_clk);
1966
1967         return 0;
1968 }
1969
1970 static int davinci_emac_suspend(struct device *dev)
1971 {
1972         struct platform_device *pdev = to_platform_device(dev);
1973         struct net_device *ndev = platform_get_drvdata(pdev);
1974
1975         if (netif_running(ndev))
1976                 emac_dev_stop(ndev);
1977
1978         clk_disable(emac_clk);
1979
1980         return 0;
1981 }
1982
1983 static int davinci_emac_resume(struct device *dev)
1984 {
1985         struct platform_device *pdev = to_platform_device(dev);
1986         struct net_device *ndev = platform_get_drvdata(pdev);
1987
1988         clk_enable(emac_clk);
1989
1990         if (netif_running(ndev))
1991                 emac_dev_open(ndev);
1992
1993         return 0;
1994 }
1995
1996 static const struct dev_pm_ops davinci_emac_pm_ops = {
1997         .suspend        = davinci_emac_suspend,
1998         .resume         = davinci_emac_resume,
1999 };
2000
2001 /**
2002  * davinci_emac_driver: EMAC platform driver structure
2003  */
2004 static struct platform_driver davinci_emac_driver = {
2005         .driver = {
2006                 .name    = "davinci_emac",
2007                 .owner   = THIS_MODULE,
2008                 .pm      = &davinci_emac_pm_ops,
2009         },
2010         .probe = davinci_emac_probe,
2011         .remove = __devexit_p(davinci_emac_remove),
2012 };
2013
2014 /**
2015  * davinci_emac_init: EMAC driver module init
2016  *
2017  * Called when initializing the driver. We register the driver with
2018  * the platform.
2019  */
2020 static int __init davinci_emac_init(void)
2021 {
2022         return platform_driver_register(&davinci_emac_driver);
2023 }
2024 late_initcall(davinci_emac_init);
2025
2026 /**
2027  * davinci_emac_exit: EMAC driver module exit
2028  *
2029  * Called when exiting the driver completely. We unregister the driver with
2030  * the platform and exit
2031  */
2032 static void __exit davinci_emac_exit(void)
2033 {
2034         platform_driver_unregister(&davinci_emac_driver);
2035 }
2036 module_exit(davinci_emac_exit);
2037
2038 MODULE_LICENSE("GPL");
2039 MODULE_AUTHOR("DaVinci EMAC Maintainer: Anant Gole <anantgole@ti.com>");
2040 MODULE_AUTHOR("DaVinci EMAC Maintainer: Chaithrika U S <chaithrika@ti.com>");
2041 MODULE_DESCRIPTION("DaVinci EMAC Ethernet driver");