1 /* 2 * drivers/net/ethernet/ibm/emac/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/list.h> 30 #include <linux/kernel.h> 31 #include <linux/interrupt.h> 32 #include <linux/netdevice.h> 33 #include <linux/dma-mapping.h> 34 #include <linux/spinlock.h> 35 #include <linux/of_platform.h> 36 #include <linux/slab.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_EMAC_TXB 50 #define NUM_RX_BUFF CONFIG_IBM_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_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 emac_regs __iomem *emacp; 171 struct platform_device *ofdev; 172 struct device_node **blist; /* bootlist entry */ 173 174 /* MAL linkage */ 175 u32 mal_ph; 176 struct platform_device *mal_dev; 177 u32 mal_rx_chan; 178 u32 mal_tx_chan; 179 struct mal_instance *mal; 180 struct mal_commac commac; 181 182 /* PHY infos */ 183 int phy_mode; 184 u32 phy_map; 185 u32 phy_address; 186 u32 phy_feat_exc; 187 struct mii_phy phy; 188 struct mutex link_lock; 189 struct delayed_work link_work; 190 int link_polling; 191 192 /* GPCS PHY infos */ 193 u32 gpcs_address; 194 195 /* Shared MDIO if any */ 196 u32 mdio_ph; 197 struct platform_device *mdio_dev; 198 struct emac_instance *mdio_instance; 199 struct mutex mdio_lock; 200 201 /* Device-tree based phy configuration */ 202 struct mii_bus *mii_bus; 203 struct phy_device *phy_dev; 204 205 /* ZMII infos if any */ 206 u32 zmii_ph; 207 u32 zmii_port; 208 struct platform_device *zmii_dev; 209 210 /* RGMII infos if any */ 211 u32 rgmii_ph; 212 u32 rgmii_port; 213 struct platform_device *rgmii_dev; 214 215 /* TAH infos if any */ 216 u32 tah_ph; 217 u32 tah_port; 218 struct platform_device *tah_dev; 219 220 /* IRQs */ 221 int wol_irq; 222 int emac_irq; 223 224 /* OPB bus frequency in Mhz */ 225 u32 opb_bus_freq; 226 227 /* Cell index within an ASIC (for clk mgmnt) */ 228 u32 cell_index; 229 230 /* Max supported MTU */ 231 u32 max_mtu; 232 233 /* Feature bits (from probe table) */ 234 unsigned int features; 235 236 /* Tx and Rx fifo sizes & other infos in bytes */ 237 u32 tx_fifo_size; 238 u32 tx_fifo_size_gige; 239 u32 rx_fifo_size; 240 u32 rx_fifo_size_gige; 241 u32 fifo_entry_size; 242 u32 mal_burst_size; /* move to MAL ? */ 243 244 /* IAHT and GAHT filter parameterization */ 245 u32 xaht_slots_shift; 246 u32 xaht_width_shift; 247 248 /* Descriptor management 249 */ 250 struct mal_descriptor *tx_desc; 251 int tx_cnt; 252 int tx_slot; 253 int ack_slot; 254 255 struct mal_descriptor *rx_desc; 256 int rx_slot; 257 struct sk_buff *rx_sg_skb; /* 1 */ 258 int rx_skb_size; 259 int rx_sync_size; 260 261 struct sk_buff *tx_skb[NUM_TX_BUFF]; 262 struct sk_buff *rx_skb[NUM_RX_BUFF]; 263 264 /* Stats 265 */ 266 struct emac_error_stats estats; 267 struct emac_stats stats; 268 269 /* Misc 270 */ 271 int reset_failed; 272 int stop_timeout; /* in us */ 273 int no_mcast; 274 int mcast_pending; 275 int opened; 276 struct work_struct reset_work; 277 spinlock_t lock; 278 }; 279 280 /* 281 * Features of various EMAC implementations 282 */ 283 284 /* 285 * No flow control on 40x according to the original driver 286 */ 287 #define EMAC_FTR_NO_FLOW_CONTROL_40x 0x00000001 288 /* 289 * Cell is an EMAC4 290 */ 291 #define EMAC_FTR_EMAC4 0x00000002 292 /* 293 * For the 440SPe, AMCC inexplicably changed the polarity of 294 * the "operation complete" bit in the MII control register. 295 */ 296 #define EMAC_FTR_STACR_OC_INVERT 0x00000004 297 /* 298 * Set if we have a TAH. 299 */ 300 #define EMAC_FTR_HAS_TAH 0x00000008 301 /* 302 * Set if we have a ZMII. 303 */ 304 #define EMAC_FTR_HAS_ZMII 0x00000010 305 /* 306 * Set if we have a RGMII. 307 */ 308 #define EMAC_FTR_HAS_RGMII 0x00000020 309 /* 310 * Set if we have new type STACR with STAOPC 311 */ 312 #define EMAC_FTR_HAS_NEW_STACR 0x00000040 313 /* 314 * Set if we need phy clock workaround for 440gx 315 */ 316 #define EMAC_FTR_440GX_PHY_CLK_FIX 0x00000080 317 /* 318 * Set if we need phy clock workaround for 440ep or 440gr 319 */ 320 #define EMAC_FTR_440EP_PHY_CLK_FIX 0x00000100 321 /* 322 * The 405EX and 460EX contain the EMAC4SYNC core 323 */ 324 #define EMAC_FTR_EMAC4SYNC 0x00000200 325 /* 326 * Set if we need phy clock workaround for 460ex or 460gt 327 */ 328 #define EMAC_FTR_460EX_PHY_CLK_FIX 0x00000400 329 /* 330 * APM821xx requires Jumbo frame size set explicitly 331 */ 332 #define EMAC_APM821XX_REQ_JUMBO_FRAME_SIZE 0x00000800 333 /* 334 * APM821xx does not support Half Duplex mode 335 */ 336 #define EMAC_FTR_APM821XX_NO_HALF_DUPLEX 0x00001000 337 338 /* Right now, we don't quite handle the always/possible masks on the 339 * most optimal way as we don't have a way to say something like 340 * always EMAC4. Patches welcome. 341 */ 342 enum { 343 EMAC_FTRS_ALWAYS = 0, 344 345 EMAC_FTRS_POSSIBLE = 346 #ifdef CONFIG_IBM_EMAC_EMAC4 347 EMAC_FTR_EMAC4 | EMAC_FTR_EMAC4SYNC | 348 EMAC_FTR_HAS_NEW_STACR | 349 EMAC_FTR_STACR_OC_INVERT | EMAC_FTR_440GX_PHY_CLK_FIX | 350 #endif 351 #ifdef CONFIG_IBM_EMAC_TAH 352 EMAC_FTR_HAS_TAH | 353 #endif 354 #ifdef CONFIG_IBM_EMAC_ZMII 355 EMAC_FTR_HAS_ZMII | 356 #endif 357 #ifdef CONFIG_IBM_EMAC_RGMII 358 EMAC_FTR_HAS_RGMII | 359 #endif 360 #ifdef CONFIG_IBM_EMAC_NO_FLOW_CTRL 361 EMAC_FTR_NO_FLOW_CONTROL_40x | 362 #endif 363 EMAC_FTR_460EX_PHY_CLK_FIX | 364 EMAC_FTR_440EP_PHY_CLK_FIX | 365 EMAC_APM821XX_REQ_JUMBO_FRAME_SIZE | 366 EMAC_FTR_APM821XX_NO_HALF_DUPLEX, 367 }; 368 369 static inline int emac_has_feature(struct emac_instance *dev, 370 unsigned long feature) 371 { 372 return (EMAC_FTRS_ALWAYS & feature) || 373 (EMAC_FTRS_POSSIBLE & dev->features & feature); 374 } 375 376 /* 377 * Various instances of the EMAC core have varying 1) number of 378 * address match slots, 2) width of the registers for handling address 379 * match slots, 3) number of registers for handling address match 380 * slots and 4) base offset for those registers. 381 * 382 * These macros and inlines handle these differences based on 383 * parameters supplied by the device structure which are, in turn, 384 * initialized based on the "compatible" entry in the device tree. 385 */ 386 387 #define EMAC4_XAHT_SLOTS_SHIFT 6 388 #define EMAC4_XAHT_WIDTH_SHIFT 4 389 390 #define EMAC4SYNC_XAHT_SLOTS_SHIFT 8 391 #define EMAC4SYNC_XAHT_WIDTH_SHIFT 5 392 393 /* The largest span between slots and widths above is 3 */ 394 #define EMAC_XAHT_MAX_REGS (1 << 3) 395 396 #define EMAC_XAHT_SLOTS(dev) (1 << (dev)->xaht_slots_shift) 397 #define EMAC_XAHT_WIDTH(dev) (1 << (dev)->xaht_width_shift) 398 #define EMAC_XAHT_REGS(dev) (1 << ((dev)->xaht_slots_shift - \ 399 (dev)->xaht_width_shift)) 400 401 #define EMAC_XAHT_CRC_TO_SLOT(dev, crc) \ 402 ((EMAC_XAHT_SLOTS(dev) - 1) - \ 403 ((crc) >> ((sizeof (u32) * BITS_PER_BYTE) - \ 404 (dev)->xaht_slots_shift))) 405 406 #define EMAC_XAHT_SLOT_TO_REG(dev, slot) \ 407 ((slot) >> (dev)->xaht_width_shift) 408 409 #define EMAC_XAHT_SLOT_TO_MASK(dev, slot) \ 410 ((u32)(1 << (EMAC_XAHT_WIDTH(dev) - 1)) >> \ 411 ((slot) & (u32)(EMAC_XAHT_WIDTH(dev) - 1))) 412 413 static inline u32 *emac_xaht_base(struct emac_instance *dev) 414 { 415 struct emac_regs __iomem *p = dev->emacp; 416 int offset; 417 418 /* The first IAHT entry always is the base of the block of 419 * IAHT and GAHT registers. 420 */ 421 if (emac_has_feature(dev, EMAC_FTR_EMAC4SYNC)) 422 offset = offsetof(struct emac_regs, u1.emac4sync.iaht1); 423 else 424 offset = offsetof(struct emac_regs, u0.emac4.iaht1); 425 426 return (u32 *)((ptrdiff_t)p + offset); 427 } 428 429 static inline u32 *emac_gaht_base(struct emac_instance *dev) 430 { 431 /* GAHT registers always come after an identical number of 432 * IAHT registers. 433 */ 434 return emac_xaht_base(dev) + EMAC_XAHT_REGS(dev); 435 } 436 437 static inline u32 *emac_iaht_base(struct emac_instance *dev) 438 { 439 /* IAHT registers always come before an identical number of 440 * GAHT registers. 441 */ 442 return emac_xaht_base(dev); 443 } 444 445 /* Ethtool get_regs complex data. 446 * We want to get not just EMAC registers, but also MAL, ZMII, RGMII, TAH 447 * when available. 448 * 449 * Returned BLOB consists of the ibm_emac_ethtool_regs_hdr, 450 * MAL registers, EMAC registers and optional ZMII, RGMII, TAH registers. 451 * Each register component is preceded with emac_ethtool_regs_subhdr. 452 * Order of the optional headers follows their relative bit posititions 453 * in emac_ethtool_regs_hdr.components 454 */ 455 #define EMAC_ETHTOOL_REGS_ZMII 0x00000001 456 #define EMAC_ETHTOOL_REGS_RGMII 0x00000002 457 #define EMAC_ETHTOOL_REGS_TAH 0x00000004 458 459 struct emac_ethtool_regs_hdr { 460 u32 components; 461 }; 462 463 struct emac_ethtool_regs_subhdr { 464 u32 version; 465 u32 index; 466 }; 467 468 #define EMAC_ETHTOOL_REGS_VER 3 469 #define EMAC4_ETHTOOL_REGS_VER 4 470 #define EMAC4SYNC_ETHTOOL_REGS_VER 5 471 472 #endif /* __IBM_NEWEMAC_CORE_H */ 473