drivers/net/wireless/iwlwifi/pcie/internal.h

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2003 - 2014 Intel Corporation. All rights reserved.
   4  *
   5  * Portions of this file are derived from the ipw3945 project, as well
   6  * as portions of the ieee80211 subsystem header files.
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of version 2 of the GNU General Public License as
  10  * published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but WITHOUT
  13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  15  * more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along with
  18  * this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  20  *
  21  * The full GNU General Public License is included in this distribution in the
  22  * file called LICENSE.
  23  *
  24  * Contact Information:
  25  *  Intel Linux Wireless <ilw@linux.intel.com>
  26  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  27  *
  28  *****************************************************************************/
  29 #ifndef __iwl_trans_int_pcie_h__
  30 #define __iwl_trans_int_pcie_h__
  31
  32 #include <linux/spinlock.h>
  33 #include <linux/interrupt.h>
  34 #include <linux/skbuff.h>
  35 #include <linux/wait.h>
  36 #include <linux/pci.h>
  37 #include <linux/timer.h>
  38
  39 #include "iwl-fh.h"
  40 #include "iwl-csr.h"
  41 #include "iwl-trans.h"
  42 #include "iwl-debug.h"
  43 #include "iwl-io.h"
  44 #include "iwl-op-mode.h"
  45
  46 struct iwl_host_cmd;
  47
  48 /*This file includes the declaration that are internal to the
  49  * trans_pcie layer */
  50
  51 struct iwl_rx_mem_buffer {
  52         dma_addr_t page_dma;
  53         struct page *page;
  54         struct list_head list;
  55 };
  56
  57 /**
  58  * struct isr_statistics - interrupt statistics
  59  *
  60  */
  61 struct isr_statistics {
  62         u32 hw;
  63         u32 sw;
  64         u32 err_code;
  65         u32 sch;
  66         u32 alive;
  67         u32 rfkill;
  68         u32 ctkill;
  69         u32 wakeup;
  70         u32 rx;
  71         u32 tx;
  72         u32 unhandled;
  73 };
  74
  75 /**
  76  * struct iwl_rxq - Rx queue
  77  * @bd: driver's pointer to buffer of receive buffer descriptors (rbd)
  78  * @bd_dma: bus address of buffer of receive buffer descriptors (rbd)
  79  * @pool:
  80  * @queue:
  81  * @read: Shared index to newest available Rx buffer
  82  * @write: Shared index to oldest written Rx packet
  83  * @free_count: Number of pre-allocated buffers in rx_free
  84  * @write_actual:
  85  * @rx_free: list of free SKBs for use
  86  * @rx_used: List of Rx buffers with no SKB
  87  * @need_update: flag to indicate we need to update read/write index
  88  * @rb_stts: driver's pointer to receive buffer status
  89  * @rb_stts_dma: bus address of receive buffer status
  90  * @lock:
  91  *
  92  * NOTE:  rx_free and rx_used are used as a FIFO for iwl_rx_mem_buffers
  93  */
  94 struct iwl_rxq {
  95         __le32 *bd;
  96         dma_addr_t bd_dma;
  97         struct iwl_rx_mem_buffer pool[RX_QUEUE_SIZE + RX_FREE_BUFFERS];
  98         struct iwl_rx_mem_buffer *queue[RX_QUEUE_SIZE];
  99         u32 read;
 100         u32 write;
 101         u32 free_count;
 102         u32 write_actual;
 103         struct list_head rx_free;
 104         struct list_head rx_used;
 105         int need_update;
 106         struct iwl_rb_status *rb_stts;
 107         dma_addr_t rb_stts_dma;
 108         spinlock_t lock;
 109 };
 110
 111 struct iwl_dma_ptr {
 112         dma_addr_t dma;
 113         void *addr;
 114         size_t size;
 115 };
 116
 117 /**
 118  * iwl_queue_inc_wrap - increment queue index, wrap back to beginning
 119  * @index -- current index
 120  * @n_bd -- total number of entries in queue (must be power of 2)
 121  */
 122 static inline int iwl_queue_inc_wrap(int index, int n_bd)
 123 {
 124         return ++index & (n_bd - 1);
 125 }
 126
 127 /**
 128  * iwl_queue_dec_wrap - decrement queue index, wrap back to end
 129  * @index -- current index
 130  * @n_bd -- total number of entries in queue (must be power of 2)
 131  */
 132 static inline int iwl_queue_dec_wrap(int index, int n_bd)
 133 {
 134         return --index & (n_bd - 1);
 135 }
 136
 137 struct iwl_cmd_meta {
 138         /* only for SYNC commands, iff the reply skb is wanted */
 139         struct iwl_host_cmd *source;
 140         u32 flags;
 141 };
 142
 143 /*
 144  * Generic queue structure
 145  *
 146  * Contains common data for Rx and Tx queues.
 147  *
 148  * Note the difference between n_bd and n_window: the hardware
 149  * always assumes 256 descriptors, so n_bd is always 256 (unless
 150  * there might be HW changes in the future). For the normal TX
 151  * queues, n_window, which is the size of the software queue data
 152  * is also 256; however, for the command queue, n_window is only
 153  * 32 since we don't need so many commands pending. Since the HW
 154  * still uses 256 BDs for DMA though, n_bd stays 256. As a result,
 155  * the software buffers (in the variables @meta, @txb in struct
 156  * iwl_txq) only have 32 entries, while the HW buffers (@tfds in
 157  * the same struct) have 256.
 158  * This means that we end up with the following:
 159  *  HW entries: | 0 | ... | N * 32 | ... | N * 32 + 31 | ... | 255 |
 160  *  SW entries:           | 0      | ... | 31          |
 161  * where N is a number between 0 and 7. This means that the SW
 162  * data is a window overlayed over the HW queue.
 163  */
 164 struct iwl_queue {
 165         int n_bd;              /* number of BDs in this queue */
 166         int write_ptr;       /* 1-st empty entry (index) host_w*/
 167         int read_ptr;         /* last used entry (index) host_r*/
 168         /* use for monitoring and recovering the stuck queue */
 169         dma_addr_t dma_addr;   /* physical addr for BD's */
 170         int n_window;          /* safe queue window */
 171         u32 id;
 172         int low_mark;          /* low watermark, resume queue if free
 173                                 * space more than this */
 174         int high_mark;         /* high watermark, stop queue if free
 175                                 * space less than this */
 176 };
 177
 178 #define TFD_TX_CMD_SLOTS 256
 179 #define TFD_CMD_SLOTS 32
 180
 181 /*
 182  * The FH will write back to the first TB only, so we need
 183  * to copy some data into the buffer regardless of whether
 184  * it should be mapped or not. This indicates how big the
 185  * first TB must be to include the scratch buffer. Since
 186  * the scratch is 4 bytes at offset 12, it's 16 now. If we
 187  * make it bigger then allocations will be bigger and copy
 188  * slower, so that's probably not useful.
 189  */
 190 #define IWL_HCMD_SCRATCHBUF_SIZE        16
 191
 192 struct iwl_pcie_txq_entry {
 193         struct iwl_device_cmd *cmd;
 194         struct sk_buff *skb;
 195         /* buffer to free after command completes */
 196         const void *free_buf;
 197         struct iwl_cmd_meta meta;
 198 };
 199
 200 struct iwl_pcie_txq_scratch_buf {
 201         struct iwl_cmd_header hdr;
 202         u8 buf[8];
 203         __le32 scratch;
 204 };
 205
 206 /**
 207  * struct iwl_txq - Tx Queue for DMA
 208  * @q: generic Rx/Tx queue descriptor
 209  * @tfds: transmit frame descriptors (DMA memory)
 210  * @scratchbufs: start of command headers, including scratch buffers, for
 211  *      the writeback -- this is DMA memory and an array holding one buffer
 212  *      for each command on the queue
 213  * @scratchbufs_dma: DMA address for the scratchbufs start
 214  * @entries: transmit entries (driver state)
 215  * @lock: queue lock
 216  * @stuck_timer: timer that fires if queue gets stuck
 217  * @trans_pcie: pointer back to transport (for timer)
 218  * @need_update: indicates need to update read/write index
 219  * @active: stores if queue is active
 220  * @ampdu: true if this queue is an ampdu queue for an specific RA/TID
 221  *
 222  * A Tx queue consists of circular buffer of BDs (a.k.a. TFDs, transmit frame
 223  * descriptors) and required locking structures.
 224  */
 225 struct iwl_txq {
 226         struct iwl_queue q;
 227         struct iwl_tfd *tfds;
 228         struct iwl_pcie_txq_scratch_buf *scratchbufs;
 229         dma_addr_t scratchbufs_dma;
 230         struct iwl_pcie_txq_entry *entries;
 231         spinlock_t lock;
 232         struct timer_list stuck_timer;
 233         struct iwl_trans_pcie *trans_pcie;
 234         u8 need_update;
 235         u8 active;
 236         bool ampdu;
 237 };
 238
 239 static inline dma_addr_t
 240 iwl_pcie_get_scratchbuf_dma(struct iwl_txq *txq, int idx)
 241 {
 242         return txq->scratchbufs_dma +
 243                sizeof(struct iwl_pcie_txq_scratch_buf) * idx;
 244 }
 245
 246 /**
 247  * struct iwl_trans_pcie - PCIe transport specific data
 248  * @rxq: all the RX queue data
 249  * @rx_replenish: work that will be called when buffers need to be allocated
 250  * @drv - pointer to iwl_drv
 251  * @trans: pointer to the generic transport area
 252  * @scd_base_addr: scheduler sram base address in SRAM
 253  * @scd_bc_tbls: pointer to the byte count table of the scheduler
 254  * @kw: keep warm address
 255  * @pci_dev: basic pci-network driver stuff
 256  * @hw_base: pci hardware address support
 257  * @ucode_write_complete: indicates that the ucode has been copied.
 258  * @ucode_write_waitq: wait queue for uCode load
 259  * @cmd_queue - command queue number
 260  * @rx_buf_size_8k: 8 kB RX buffer size
 261  * @bc_table_dword: true if the BC table expects DWORD (as opposed to bytes)
 262  * @rx_page_order: page order for receive buffer size
 263  * @wd_timeout: queue watchdog timeout (jiffies)
 264  * @reg_lock: protect hw register access
 265  * @cmd_in_flight: true when we have a host command in flight
 266  */
 267 struct iwl_trans_pcie {
 268         struct iwl_rxq rxq;
 269         struct work_struct rx_replenish;
 270         struct iwl_trans *trans;
 271         struct iwl_drv *drv;
 272
 273         /* INT ICT Table */
 274         __le32 *ict_tbl;
 275         dma_addr_t ict_tbl_dma;
 276         int ict_index;
 277         bool use_ict;
 278         struct isr_statistics isr_stats;
 279
 280         spinlock_t irq_lock;
 281         u32 inta_mask;
 282         u32 scd_base_addr;
 283         struct iwl_dma_ptr scd_bc_tbls;
 284         struct iwl_dma_ptr kw;
 285
 286         struct iwl_txq *txq;
 287         unsigned long queue_used[BITS_TO_LONGS(IWL_MAX_HW_QUEUES)];
 288         unsigned long queue_stopped[BITS_TO_LONGS(IWL_MAX_HW_QUEUES)];
 289
 290         /* PCI bus related data */
 291         struct pci_dev *pci_dev;
 292         void __iomem *hw_base;
 293
 294         bool ucode_write_complete;
 295         wait_queue_head_t ucode_write_waitq;
 296         wait_queue_head_t wait_command_queue;
 297
 298         u8 cmd_queue;
 299         u8 cmd_fifo;
 300         u8 n_no_reclaim_cmds;
 301         u8 no_reclaim_cmds[MAX_NO_RECLAIM_CMDS];
 302
 303         bool rx_buf_size_8k;
 304         bool bc_table_dword;
 305         u32 rx_page_order;
 306
 307         const char **command_names;
 308
 309         /* queue watchdog */
 310         unsigned long wd_timeout;
 311
 312         /*protect hw register */
 313         spinlock_t reg_lock;
 314         bool cmd_in_flight;
 315 };
 316
 317 #define IWL_TRANS_GET_PCIE_TRANS(_iwl_trans) \
 318         ((struct iwl_trans_pcie *) ((_iwl_trans)->trans_specific))
 319
 320 static inline struct iwl_trans *
 321 iwl_trans_pcie_get_trans(struct iwl_trans_pcie *trans_pcie)
 322 {
 323         return container_of((void *)trans_pcie, struct iwl_trans,
 324                             trans_specific);
 325 }
 326
 327 /*
 328  * Convention: trans API functions: iwl_trans_pcie_XXX
 329  *      Other functions: iwl_pcie_XXX
 330  */
 331 struct iwl_trans *iwl_trans_pcie_alloc(struct pci_dev *pdev,
 332                                        const struct pci_device_id *ent,
 333                                        const struct iwl_cfg *cfg);
 334 void iwl_trans_pcie_free(struct iwl_trans *trans);
 335
 336 /*****************************************************
 337 * RX
 338 ******************************************************/
 339 int iwl_pcie_rx_init(struct iwl_trans *trans);
 340 irqreturn_t iwl_pcie_irq_handler(int irq, void *dev_id);
 341 int iwl_pcie_rx_stop(struct iwl_trans *trans);
 342 void iwl_pcie_rx_free(struct iwl_trans *trans);
 343
 344 /*****************************************************
 345 * ICT - interrupt handling
 346 ******************************************************/
 347 irqreturn_t iwl_pcie_isr(int irq, void *data);
 348 int iwl_pcie_alloc_ict(struct iwl_trans *trans);
 349 void iwl_pcie_free_ict(struct iwl_trans *trans);
 350 void iwl_pcie_reset_ict(struct iwl_trans *trans);
 351 void iwl_pcie_disable_ict(struct iwl_trans *trans);
 352
 353 /*****************************************************
 354 * TX / HCMD
 355 ******************************************************/
 356 int iwl_pcie_tx_init(struct iwl_trans *trans);
 357 void iwl_pcie_tx_start(struct iwl_trans *trans, u32 scd_base_addr);
 358 int iwl_pcie_tx_stop(struct iwl_trans *trans);
 359 void iwl_pcie_tx_free(struct iwl_trans *trans);
 360 void iwl_trans_pcie_txq_enable(struct iwl_trans *trans, int txq_id, int fifo,
 361                                int sta_id, int tid, int frame_limit, u16 ssn);
 362 void iwl_trans_pcie_txq_disable(struct iwl_trans *trans, int queue);
 363 int iwl_trans_pcie_tx(struct iwl_trans *trans, struct sk_buff *skb,
 364                       struct iwl_device_cmd *dev_cmd, int txq_id);
 365 void iwl_pcie_txq_inc_wr_ptr(struct iwl_trans *trans, struct iwl_txq *txq);
 366 int iwl_trans_pcie_send_hcmd(struct iwl_trans *trans, struct iwl_host_cmd *cmd);
 367 void iwl_pcie_hcmd_complete(struct iwl_trans *trans,
 368                             struct iwl_rx_cmd_buffer *rxb, int handler_status);
 369 void iwl_trans_pcie_reclaim(struct iwl_trans *trans, int txq_id, int ssn,
 370                             struct sk_buff_head *skbs);
 371 void iwl_trans_pcie_tx_reset(struct iwl_trans *trans);
 372
 373 /*****************************************************
 374 * Error handling
 375 ******************************************************/
 376 void iwl_pcie_dump_csr(struct iwl_trans *trans);
 377
 378 /*****************************************************
 379 * Helpers
 380 ******************************************************/
 381 static inline void iwl_disable_interrupts(struct iwl_trans *trans)
 382 {
 383         clear_bit(STATUS_INT_ENABLED, &trans->status);
 384
 385         /* disable interrupts from uCode/NIC to host */
 386         iwl_write32(trans, CSR_INT_MASK, 0x00000000);
 387
 388         /* acknowledge/clear/reset any interrupts still pending
 389          * from uCode or flow handler (Rx/Tx DMA) */
 390         iwl_write32(trans, CSR_INT, 0xffffffff);
 391         iwl_write32(trans, CSR_FH_INT_STATUS, 0xffffffff);
 392         IWL_DEBUG_ISR(trans, "Disabled interrupts\n");
 393 }
 394
 395 static inline void iwl_enable_interrupts(struct iwl_trans *trans)
 396 {
 397         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 398
 399         IWL_DEBUG_ISR(trans, "Enabling interrupts\n");
 400         set_bit(STATUS_INT_ENABLED, &trans->status);
 401         trans_pcie->inta_mask = CSR_INI_SET_MASK;
 402         iwl_write32(trans, CSR_INT_MASK, trans_pcie->inta_mask);
 403 }
 404
 405 static inline void iwl_enable_rfkill_int(struct iwl_trans *trans)
 406 {
 407         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 408
 409         IWL_DEBUG_ISR(trans, "Enabling rfkill interrupt\n");
 410         trans_pcie->inta_mask = CSR_INT_BIT_RF_KILL;
 411         iwl_write32(trans, CSR_INT_MASK, trans_pcie->inta_mask);
 412 }
 413
 414 static inline void iwl_wake_queue(struct iwl_trans *trans,
 415                                   struct iwl_txq *txq)
 416 {
 417         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 418
 419         if (test_and_clear_bit(txq->q.id, trans_pcie->queue_stopped)) {
 420                 IWL_DEBUG_TX_QUEUES(trans, "Wake hwq %d\n", txq->q.id);
 421                 iwl_op_mode_queue_not_full(trans->op_mode, txq->q.id);
 422         }
 423 }
 424
 425 static inline void iwl_stop_queue(struct iwl_trans *trans,
 426                                   struct iwl_txq *txq)
 427 {
 428         struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 429
 430         if (!test_and_set_bit(txq->q.id, trans_pcie->queue_stopped)) {
 431                 iwl_op_mode_queue_full(trans->op_mode, txq->q.id);
 432                 IWL_DEBUG_TX_QUEUES(trans, "Stop hwq %d\n", txq->q.id);
 433         } else
 434                 IWL_DEBUG_TX_QUEUES(trans, "hwq %d already stopped\n",
 435                                     txq->q.id);
 436 }
 437
 438 static inline bool iwl_queue_used(const struct iwl_queue *q, int i)
 439 {
 440         return q->write_ptr >= q->read_ptr ?
 441                 (i >= q->read_ptr && i < q->write_ptr) :
 442                 !(i < q->read_ptr && i >= q->write_ptr);
 443 }
 444
 445 static inline u8 get_cmd_index(struct iwl_queue *q, u32 index)
 446 {
 447         return index & (q->n_window - 1);
 448 }
 449
 450 static inline const char *get_cmd_string(struct iwl_trans_pcie *trans_pcie,
 451                                          u8 cmd)
 452 {
 453         if (!trans_pcie->command_names || !trans_pcie->command_names[cmd])
 454                 return "UNKNOWN";
 455         return trans_pcie->command_names[cmd];
 456 }
 457
 458 static inline bool iwl_is_rfkill_set(struct iwl_trans *trans)
 459 {
 460         return !(iwl_read32(trans, CSR_GP_CNTRL) &
 461                 CSR_GP_CNTRL_REG_FLAG_HW_RF_KILL_SW);
 462 }
 463
 464 static inline void __iwl_trans_pcie_set_bits_mask(struct iwl_trans *trans,
 465                                                   u32 reg, u32 mask, u32 value)
 466 {
 467         u32 v;
 468
 469 #ifdef CONFIG_IWLWIFI_DEBUG
 470         WARN_ON_ONCE(value & ~mask);
 471 #endif
 472
 473         v = iwl_read32(trans, reg);
 474         v &= ~mask;
 475         v |= value;
 476         iwl_write32(trans, reg, v);
 477 }
 478
 479 static inline void __iwl_trans_pcie_clear_bit(struct iwl_trans *trans,
 480                                               u32 reg, u32 mask)
 481 {
 482         __iwl_trans_pcie_set_bits_mask(trans, reg, mask, 0);
 483 }
 484
 485 static inline void __iwl_trans_pcie_set_bit(struct iwl_trans *trans,
 486                                             u32 reg, u32 mask)
 487 {
 488         __iwl_trans_pcie_set_bits_mask(trans, reg, mask, mask);
 489 }
 490
 491 #endif /* __iwl_trans_int_pcie_h__ */