target/linux/ath79/files/drivers/net/ethernet/atheros/ag71xx/ag71xx.h

   1 /*
   2  *  Atheros AR71xx built-in ethernet mac driver
   3  *
   4  *  Copyright (C) 2008-2010 Gabor Juhos <juhosg@openwrt.org>
   5  *  Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
   6  *
   7  *  Based on Atheros' AG7100 driver
   8  *
   9  *  This program is free software; you can redistribute it and/or modify it
  10  *  under the terms of the GNU General Public License version 2 as published
  11  *  by the Free Software Foundation.
  12  */
  13
  14 #ifndef __AG71XX_H
  15 #define __AG71XX_H
  16
  17 #include <linux/kernel.h>
  18 #include <linux/version.h>
  19 #include <linux/module.h>
  20 #include <linux/init.h>
  21 #include <linux/types.h>
  22 #include <linux/random.h>
  23 #include <linux/spinlock.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/ethtool.h>
  27 #include <linux/etherdevice.h>
  28 #include <linux/if_vlan.h>
  29 #include <linux/phy.h>
  30 #include <linux/skbuff.h>
  31 #include <linux/dma-mapping.h>
  32 #include <linux/workqueue.h>
  33 #include <linux/reset.h>
  34 #include <linux/of.h>
  35 #include <linux/mfd/syscon.h>
  36 #include <linux/regmap.h>
  37
  38 #include <linux/bitops.h>
  39
  40 #include <asm/mach-ath79/ar71xx_regs.h>
  41 #include <asm/mach-ath79/ath79.h>
  42
  43 #define AG71XX_DRV_NAME         "ag71xx"
  44
  45 /*
  46  * For our NAPI weight bigger does *NOT* mean better - it means more
  47  * D-cache misses and lots more wasted cycles than we'll ever
  48  * possibly gain from saving instructions.
  49  */
  50 #define AG71XX_NAPI_WEIGHT      32
  51 #define AG71XX_OOM_REFILL       (1 + HZ/10)
  52
  53 #define AG71XX_INT_ERR  (AG71XX_INT_RX_BE | AG71XX_INT_TX_BE)
  54 #define AG71XX_INT_TX   (AG71XX_INT_TX_PS)
  55 #define AG71XX_INT_RX   (AG71XX_INT_RX_PR | AG71XX_INT_RX_OF)
  56
  57 #define AG71XX_INT_POLL (AG71XX_INT_RX | AG71XX_INT_TX)
  58 #define AG71XX_INT_INIT (AG71XX_INT_ERR | AG71XX_INT_POLL)
  59
  60 #define AG71XX_TX_MTU_LEN       1540
  61
  62 #define AG71XX_TX_RING_SPLIT            512
  63 #define AG71XX_TX_RING_DS_PER_PKT       DIV_ROUND_UP(AG71XX_TX_MTU_LEN, \
  64                                                      AG71XX_TX_RING_SPLIT)
  65 #define AG71XX_TX_RING_SIZE_DEFAULT     128
  66 #define AG71XX_RX_RING_SIZE_DEFAULT     256
  67
  68 #define AG71XX_TX_RING_SIZE_MAX         128
  69 #define AG71XX_RX_RING_SIZE_MAX         256
  70
  71 #ifdef CONFIG_AG71XX_DEBUG
  72 #define DBG(fmt, args...)       pr_debug(fmt, ## args)
  73 #else
  74 #define DBG(fmt, args...)       do {} while (0)
  75 #endif
  76
  77 #define ag71xx_assert(_cond)                                            \
  78 do {                                                                    \
  79         if (_cond)                                                      \
  80                 break;                                                  \
  81         printk("%s,%d: assertion failed\n", __FILE__, __LINE__);        \
  82         BUG();                                                          \
  83 } while (0)
  84
  85 struct ag71xx_desc {
  86         u32     data;
  87         u32     ctrl;
  88 #define DESC_EMPTY      BIT(31)
  89 #define DESC_MORE       BIT(24)
  90 #define DESC_PKTLEN_M   0xfff
  91         u32     next;
  92         u32     pad;
  93 } __attribute__((aligned(4)));
  94
  95 #define AG71XX_DESC_SIZE        roundup(sizeof(struct ag71xx_desc), \
  96                                         L1_CACHE_BYTES)
  97
  98 struct ag71xx_buf {
  99         union {
 100                 struct sk_buff  *skb;
 101                 void            *rx_buf;
 102         };
 103         union {
 104                 dma_addr_t      dma_addr;
 105                 unsigned int            len;
 106         };
 107 };
 108
 109 struct ag71xx_ring {
 110         struct ag71xx_buf       *buf;
 111         u8                      *descs_cpu;
 112         dma_addr_t              descs_dma;
 113         u16                     desc_split;
 114         u16                     order;
 115         unsigned int            curr;
 116         unsigned int            dirty;
 117 };
 118
 119 struct ag71xx_int_stats {
 120         unsigned long           rx_pr;
 121         unsigned long           rx_be;
 122         unsigned long           rx_of;
 123         unsigned long           tx_ps;
 124         unsigned long           tx_be;
 125         unsigned long           tx_ur;
 126         unsigned long           total;
 127 };
 128
 129 struct ag71xx_napi_stats {
 130         unsigned long           napi_calls;
 131         unsigned long           rx_count;
 132         unsigned long           rx_packets;
 133         unsigned long           rx_packets_max;
 134         unsigned long           tx_count;
 135         unsigned long           tx_packets;
 136         unsigned long           tx_packets_max;
 137
 138         unsigned long           rx[AG71XX_NAPI_WEIGHT + 1];
 139         unsigned long           tx[AG71XX_NAPI_WEIGHT + 1];
 140 };
 141
 142 struct ag71xx_debug {
 143         struct dentry           *debugfs_dir;
 144
 145         struct ag71xx_int_stats int_stats;
 146         struct ag71xx_napi_stats napi_stats;
 147 };
 148
 149 struct ag71xx {
 150         /*
 151          * Critical data related to the per-packet data path are clustered
 152          * early in this structure to help improve the D-cache footprint.
 153          */
 154         struct ag71xx_ring      rx_ring ____cacheline_aligned;
 155         struct ag71xx_ring      tx_ring ____cacheline_aligned;
 156
 157         u16                     desc_pktlen_mask;
 158         u16                     rx_buf_size;
 159         u8                      rx_buf_offset;
 160         u8                      tx_hang_workaround:1;
 161
 162         struct net_device       *dev;
 163         struct platform_device  *pdev;
 164         spinlock_t              lock;
 165         struct napi_struct      napi;
 166         u32                     msg_enable;
 167
 168         /*
 169          * From this point onwards we're not looking at per-packet fields.
 170          */
 171         void __iomem            *mac_base;
 172         void __iomem            *mii_base;
 173
 174         struct ag71xx_desc      *stop_desc;
 175         dma_addr_t              stop_desc_dma;
 176
 177         struct phy_device       *phy_dev;
 178         void                    *phy_priv;
 179         int                     phy_if_mode;
 180
 181         unsigned int            link;
 182         unsigned int            speed;
 183         int                     duplex;
 184
 185         struct delayed_work     restart_work;
 186         struct timer_list       oom_timer;
 187
 188         struct reset_control *mac_reset;
 189
 190         u32                     fifodata[3];
 191         u32                     plldata[3];
 192         u32                     pllreg[3];
 193         struct regmap           *pllregmap;
 194
 195 #ifdef CONFIG_AG71XX_DEBUG_FS
 196         struct ag71xx_debug     debug;
 197 #endif
 198 };
 199
 200 struct ag71xx_mdio {
 201         struct reset_control *mdio_reset;
 202         struct mii_bus          *mii_bus;
 203         struct regmap           *mii_regmap;
 204 };
 205
 206 extern struct ethtool_ops ag71xx_ethtool_ops;
 207 void ag71xx_link_adjust(struct ag71xx *ag);
 208
 209 int ag71xx_phy_connect(struct ag71xx *ag);
 210 void ag71xx_phy_disconnect(struct ag71xx *ag);
 211
 212 static inline int ag71xx_desc_empty(struct ag71xx_desc *desc)
 213 {
 214         return (desc->ctrl & DESC_EMPTY) != 0;
 215 }
 216
 217 static inline struct ag71xx_desc *
 218 ag71xx_ring_desc(struct ag71xx_ring *ring, int idx)
 219 {
 220         return (struct ag71xx_desc *) &ring->descs_cpu[idx * AG71XX_DESC_SIZE];
 221 }
 222
 223 static inline int
 224 ag71xx_ring_size_order(int size)
 225 {
 226         return fls(size - 1);
 227 }
 228
 229 /* Register offsets */
 230 #define AG71XX_REG_MAC_CFG1     0x0000
 231 #define AG71XX_REG_MAC_CFG2     0x0004
 232 #define AG71XX_REG_MAC_IPG      0x0008
 233 #define AG71XX_REG_MAC_HDX      0x000c
 234 #define AG71XX_REG_MAC_MFL      0x0010
 235 #define AG71XX_REG_MII_CFG      0x0020
 236 #define AG71XX_REG_MII_CMD      0x0024
 237 #define AG71XX_REG_MII_ADDR     0x0028
 238 #define AG71XX_REG_MII_CTRL     0x002c
 239 #define AG71XX_REG_MII_STATUS   0x0030
 240 #define AG71XX_REG_MII_IND      0x0034
 241 #define AG71XX_REG_MAC_IFCTL    0x0038
 242 #define AG71XX_REG_MAC_ADDR1    0x0040
 243 #define AG71XX_REG_MAC_ADDR2    0x0044
 244 #define AG71XX_REG_FIFO_CFG0    0x0048
 245 #define AG71XX_REG_FIFO_CFG1    0x004c
 246 #define AG71XX_REG_FIFO_CFG2    0x0050
 247 #define AG71XX_REG_FIFO_CFG3    0x0054
 248 #define AG71XX_REG_FIFO_CFG4    0x0058
 249 #define AG71XX_REG_FIFO_CFG5    0x005c
 250 #define AG71XX_REG_FIFO_RAM0    0x0060
 251 #define AG71XX_REG_FIFO_RAM1    0x0064
 252 #define AG71XX_REG_FIFO_RAM2    0x0068
 253 #define AG71XX_REG_FIFO_RAM3    0x006c
 254 #define AG71XX_REG_FIFO_RAM4    0x0070
 255 #define AG71XX_REG_FIFO_RAM5    0x0074
 256 #define AG71XX_REG_FIFO_RAM6    0x0078
 257 #define AG71XX_REG_FIFO_RAM7    0x007c
 258
 259 #define AG71XX_REG_TX_CTRL      0x0180
 260 #define AG71XX_REG_TX_DESC      0x0184
 261 #define AG71XX_REG_TX_STATUS    0x0188
 262 #define AG71XX_REG_RX_CTRL      0x018c
 263 #define AG71XX_REG_RX_DESC      0x0190
 264 #define AG71XX_REG_RX_STATUS    0x0194
 265 #define AG71XX_REG_INT_ENABLE   0x0198
 266 #define AG71XX_REG_INT_STATUS   0x019c
 267
 268 #define AG71XX_REG_FIFO_DEPTH   0x01a8
 269 #define AG71XX_REG_RX_SM        0x01b0
 270 #define AG71XX_REG_TX_SM        0x01b4
 271
 272 #define MAC_CFG1_TXE            BIT(0)  /* Tx Enable */
 273 #define MAC_CFG1_STX            BIT(1)  /* Synchronize Tx Enable */
 274 #define MAC_CFG1_RXE            BIT(2)  /* Rx Enable */
 275 #define MAC_CFG1_SRX            BIT(3)  /* Synchronize Rx Enable */
 276 #define MAC_CFG1_TFC            BIT(4)  /* Tx Flow Control Enable */
 277 #define MAC_CFG1_RFC            BIT(5)  /* Rx Flow Control Enable */
 278 #define MAC_CFG1_LB             BIT(8)  /* Loopback mode */
 279 #define MAC_CFG1_SR             BIT(31) /* Soft Reset */
 280
 281 #define MAC_CFG2_FDX            BIT(0)
 282 #define MAC_CFG2_CRC_EN         BIT(1)
 283 #define MAC_CFG2_PAD_CRC_EN     BIT(2)
 284 #define MAC_CFG2_LEN_CHECK      BIT(4)
 285 #define MAC_CFG2_HUGE_FRAME_EN  BIT(5)
 286 #define MAC_CFG2_IF_1000        BIT(9)
 287 #define MAC_CFG2_IF_10_100      BIT(8)
 288
 289 #define FIFO_CFG0_WTM           BIT(0)  /* Watermark Module */
 290 #define FIFO_CFG0_RXS           BIT(1)  /* Rx System Module */
 291 #define FIFO_CFG0_RXF           BIT(2)  /* Rx Fabric Module */
 292 #define FIFO_CFG0_TXS           BIT(3)  /* Tx System Module */
 293 #define FIFO_CFG0_TXF           BIT(4)  /* Tx Fabric Module */
 294 #define FIFO_CFG0_ALL   (FIFO_CFG0_WTM | FIFO_CFG0_RXS | FIFO_CFG0_RXF \
 295                         | FIFO_CFG0_TXS | FIFO_CFG0_TXF)
 296
 297 #define FIFO_CFG0_ENABLE_SHIFT  8
 298
 299 #define FIFO_CFG4_DE            BIT(0)  /* Drop Event */
 300 #define FIFO_CFG4_DV            BIT(1)  /* RX_DV Event */
 301 #define FIFO_CFG4_FC            BIT(2)  /* False Carrier */
 302 #define FIFO_CFG4_CE            BIT(3)  /* Code Error */
 303 #define FIFO_CFG4_CR            BIT(4)  /* CRC error */
 304 #define FIFO_CFG4_LM            BIT(5)  /* Length Mismatch */
 305 #define FIFO_CFG4_LO            BIT(6)  /* Length out of range */
 306 #define FIFO_CFG4_OK            BIT(7)  /* Packet is OK */
 307 #define FIFO_CFG4_MC            BIT(8)  /* Multicast Packet */
 308 #define FIFO_CFG4_BC            BIT(9)  /* Broadcast Packet */
 309 #define FIFO_CFG4_DR            BIT(10) /* Dribble */
 310 #define FIFO_CFG4_LE            BIT(11) /* Long Event */
 311 #define FIFO_CFG4_CF            BIT(12) /* Control Frame */
 312 #define FIFO_CFG4_PF            BIT(13) /* Pause Frame */
 313 #define FIFO_CFG4_UO            BIT(14) /* Unsupported Opcode */
 314 #define FIFO_CFG4_VT            BIT(15) /* VLAN tag detected */
 315 #define FIFO_CFG4_FT            BIT(16) /* Frame Truncated */
 316 #define FIFO_CFG4_UC            BIT(17) /* Unicast Packet */
 317
 318 #define FIFO_CFG5_DE            BIT(0)  /* Drop Event */
 319 #define FIFO_CFG5_DV            BIT(1)  /* RX_DV Event */
 320 #define FIFO_CFG5_FC            BIT(2)  /* False Carrier */
 321 #define FIFO_CFG5_CE            BIT(3)  /* Code Error */
 322 #define FIFO_CFG5_LM            BIT(4)  /* Length Mismatch */
 323 #define FIFO_CFG5_LO            BIT(5)  /* Length Out of Range */
 324 #define FIFO_CFG5_OK            BIT(6)  /* Packet is OK */
 325 #define FIFO_CFG5_MC            BIT(7)  /* Multicast Packet */
 326 #define FIFO_CFG5_BC            BIT(8)  /* Broadcast Packet */
 327 #define FIFO_CFG5_DR            BIT(9)  /* Dribble */
 328 #define FIFO_CFG5_CF            BIT(10) /* Control Frame */
 329 #define FIFO_CFG5_PF            BIT(11) /* Pause Frame */
 330 #define FIFO_CFG5_UO            BIT(12) /* Unsupported Opcode */
 331 #define FIFO_CFG5_VT            BIT(13) /* VLAN tag detected */
 332 #define FIFO_CFG5_LE            BIT(14) /* Long Event */
 333 #define FIFO_CFG5_FT            BIT(15) /* Frame Truncated */
 334 #define FIFO_CFG5_16            BIT(16) /* unknown */
 335 #define FIFO_CFG5_17            BIT(17) /* unknown */
 336 #define FIFO_CFG5_SF            BIT(18) /* Short Frame */
 337 #define FIFO_CFG5_BM            BIT(19) /* Byte Mode */
 338
 339 #define AG71XX_INT_TX_PS        BIT(0)
 340 #define AG71XX_INT_TX_UR        BIT(1)
 341 #define AG71XX_INT_TX_BE        BIT(3)
 342 #define AG71XX_INT_RX_PR        BIT(4)
 343 #define AG71XX_INT_RX_OF        BIT(6)
 344 #define AG71XX_INT_RX_BE        BIT(7)
 345
 346 #define MAC_IFCTL_SPEED         BIT(16)
 347
 348 #define MII_CFG_CLK_DIV_4       0
 349 #define MII_CFG_CLK_DIV_6       2
 350 #define MII_CFG_CLK_DIV_8       3
 351 #define MII_CFG_CLK_DIV_10      4
 352 #define MII_CFG_CLK_DIV_14      5
 353 #define MII_CFG_CLK_DIV_20      6
 354 #define MII_CFG_CLK_DIV_28      7
 355 #define MII_CFG_CLK_DIV_34      8
 356 #define MII_CFG_CLK_DIV_42      9
 357 #define MII_CFG_CLK_DIV_50      10
 358 #define MII_CFG_CLK_DIV_58      11
 359 #define MII_CFG_CLK_DIV_66      12
 360 #define MII_CFG_CLK_DIV_74      13
 361 #define MII_CFG_CLK_DIV_82      14
 362 #define MII_CFG_CLK_DIV_98      15
 363 #define MII_CFG_RESET           BIT(31)
 364
 365 #define MII_CMD_WRITE           0x0
 366 #define MII_CMD_READ            0x1
 367 #define MII_ADDR_SHIFT          8
 368 #define MII_IND_BUSY            BIT(0)
 369 #define MII_IND_INVALID         BIT(2)
 370
 371 #define TX_CTRL_TXE             BIT(0)  /* Tx Enable */
 372
 373 #define TX_STATUS_PS            BIT(0)  /* Packet Sent */
 374 #define TX_STATUS_UR            BIT(1)  /* Tx Underrun */
 375 #define TX_STATUS_BE            BIT(3)  /* Bus Error */
 376
 377 #define RX_CTRL_RXE             BIT(0)  /* Rx Enable */
 378
 379 #define RX_STATUS_PR            BIT(0)  /* Packet Received */
 380 #define RX_STATUS_OF            BIT(2)  /* Rx Overflow */
 381 #define RX_STATUS_BE            BIT(3)  /* Bus Error */
 382
 383 static inline void ag71xx_wr(struct ag71xx *ag, unsigned reg, u32 value)
 384 {
 385         __raw_writel(value, ag->mac_base + reg);
 386         /* flush write */
 387         (void) __raw_readl(ag->mac_base + reg);
 388 }
 389
 390 static inline u32 ag71xx_rr(struct ag71xx *ag, unsigned reg)
 391 {
 392         return __raw_readl(ag->mac_base + reg);
 393 }
 394
 395 static inline void ag71xx_sb(struct ag71xx *ag, unsigned reg, u32 mask)
 396 {
 397         void __iomem *r;
 398
 399         r = ag->mac_base + reg;
 400         __raw_writel(__raw_readl(r) | mask, r);
 401         /* flush write */
 402         (void) __raw_readl(r);
 403 }
 404
 405 static inline void ag71xx_cb(struct ag71xx *ag, unsigned reg, u32 mask)
 406 {
 407         void __iomem *r;
 408
 409         r = ag->mac_base + reg;
 410         __raw_writel(__raw_readl(r) & ~mask, r);
 411         /* flush write */
 412         (void) __raw_readl(r);
 413 }
 414
 415 static inline void ag71xx_int_enable(struct ag71xx *ag, u32 ints)
 416 {
 417         ag71xx_sb(ag, AG71XX_REG_INT_ENABLE, ints);
 418 }
 419
 420 static inline void ag71xx_int_disable(struct ag71xx *ag, u32 ints)
 421 {
 422         ag71xx_cb(ag, AG71XX_REG_INT_ENABLE, ints);
 423 }
 424
 425 #ifdef CONFIG_AG71XX_DEBUG_FS
 426 int ag71xx_debugfs_root_init(void);
 427 void ag71xx_debugfs_root_exit(void);
 428 int ag71xx_debugfs_init(struct ag71xx *ag);
 429 void ag71xx_debugfs_exit(struct ag71xx *ag);
 430 void ag71xx_debugfs_update_int_stats(struct ag71xx *ag, u32 status);
 431 void ag71xx_debugfs_update_napi_stats(struct ag71xx *ag, int rx, int tx);
 432 #else
 433 static inline int ag71xx_debugfs_root_init(void) { return 0; }
 434 static inline void ag71xx_debugfs_root_exit(void) {}
 435 static inline int ag71xx_debugfs_init(struct ag71xx *ag) { return 0; }
 436 static inline void ag71xx_debugfs_exit(struct ag71xx *ag) {}
 437 static inline void ag71xx_debugfs_update_int_stats(struct ag71xx *ag,
 438                                                    u32 status) {}
 439 static inline void ag71xx_debugfs_update_napi_stats(struct ag71xx *ag,
 440                                                     int rx, int tx) {}
 441 #endif /* CONFIG_AG71XX_DEBUG_FS */
 442
 443 int ag71xx_ar7240_init(struct ag71xx *ag, struct device_node *np);
 444 void ag71xx_ar7240_cleanup(struct ag71xx *ag);
 445
 446 int ag71xx_setup_gmac(struct device_node *np);
 447
 448 int ar7240sw_phy_read(struct mii_bus *mii, int addr, int reg);
 449 int ar7240sw_phy_write(struct mii_bus *mii, int addr, int reg, u16 val);
 450
 451 #endif /* _AG71XX_H */