drivers/net/wireless/iwlwifi/iwl-io.h

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2003 - 2010 Intel Corporation. All rights reserved.
   4  *
   5  * Portions of this file are derived from the ipw3945 project.
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of version 2 of the GNU General Public License as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along with
  17  * this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  19  *
  20  * The full GNU General Public License is included in this distribution in the
  21  * file called LICENSE.
  22  *
  23  * Contact Information:
  24  *  Intel Linux Wireless <ilw@linux.intel.com>
  25  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  26  *
  27  *****************************************************************************/
  28
  29 #ifndef __iwl_io_h__
  30 #define __iwl_io_h__
  31
  32 #include <linux/io.h>
  33
  34 #include "iwl-debug.h"
  35 #include "iwl-devtrace.h"
  36
  37 /*
  38  * IO, register, and NIC memory access functions
  39  *
  40  * NOTE on naming convention and macro usage for these
  41  *
  42  * A single _ prefix before a an access function means that no state
  43  * check or debug information is printed when that function is called.
  44  *
  45  * A double __ prefix before an access function means that state is checked
  46  * and the current line number and caller function name are printed in addition
  47  * to any other debug output.
  48  *
  49  * The non-prefixed name is the #define that maps the caller into a
  50  * #define that provides the caller's name and __LINE__ to the double
  51  * prefix version.
  52  *
  53  * If you wish to call the function without any debug or state checking,
  54  * you should use the single _ prefix version (as is used by dependent IO
  55  * routines, for example _iwl_read_direct32 calls the non-check version of
  56  * _iwl_read32.)
  57  *
  58  * These declarations are *extremely* useful in quickly isolating code deltas
  59  * which result in misconfiguration of the hardware I/O.  In combination with
  60  * git-bisect and the IO debug level you can quickly determine the specific
  61  * commit which breaks the IO sequence to the hardware.
  62  *
  63  */
  64
  65 static inline void _iwl_write8(struct iwl_priv *priv, u32 ofs, u8 val)
  66 {
  67         trace_iwlwifi_dev_iowrite8(priv, ofs, val);
  68         iowrite8(val, priv->hw_base + ofs);
  69 }
  70
  71 #ifdef CONFIG_IWLWIFI_DEBUG
  72 static inline void __iwl_write8(const char *f, u32 l, struct iwl_priv *priv,
  73                                  u32 ofs, u8 val)
  74 {
  75         IWL_DEBUG_IO(priv, "write8(0x%08X, 0x%02X) - %s %d\n", ofs, val, f, l);
  76         _iwl_write8(priv, ofs, val);
  77 }
  78 #define iwl_write8(priv, ofs, val) \
  79         __iwl_write8(__FILE__, __LINE__, priv, ofs, val)
  80 #else
  81 #define iwl_write8(priv, ofs, val) _iwl_write8(priv, ofs, val)
  82 #endif
  83
  84
  85 static inline void _iwl_write32(struct iwl_priv *priv, u32 ofs, u32 val)
  86 {
  87         trace_iwlwifi_dev_iowrite32(priv, ofs, val);
  88         iowrite32(val, priv->hw_base + ofs);
  89 }
  90
  91 #ifdef CONFIG_IWLWIFI_DEBUG
  92 static inline void __iwl_write32(const char *f, u32 l, struct iwl_priv *priv,
  93                                  u32 ofs, u32 val)
  94 {
  95         IWL_DEBUG_IO(priv, "write32(0x%08X, 0x%08X) - %s %d\n", ofs, val, f, l);
  96         _iwl_write32(priv, ofs, val);
  97 }
  98 #define iwl_write32(priv, ofs, val) \
  99         __iwl_write32(__FILE__, __LINE__, priv, ofs, val)
 100 #else
 101 #define iwl_write32(priv, ofs, val) _iwl_write32(priv, ofs, val)
 102 #endif
 103
 104 static inline u32 _iwl_read32(struct iwl_priv *priv, u32 ofs)
 105 {
 106         u32 val = ioread32(priv->hw_base + ofs);
 107         trace_iwlwifi_dev_ioread32(priv, ofs, val);
 108         return val;
 109 }
 110
 111 #ifdef CONFIG_IWLWIFI_DEBUG
 112 static inline u32 __iwl_read32(char *f, u32 l, struct iwl_priv *priv, u32 ofs)
 113 {
 114         IWL_DEBUG_IO(priv, "read_direct32(0x%08X) - %s %d\n", ofs, f, l);
 115         return _iwl_read32(priv, ofs);
 116 }
 117 #define iwl_read32(priv, ofs) __iwl_read32(__FILE__, __LINE__, priv, ofs)
 118 #else
 119 #define iwl_read32(p, o) _iwl_read32(p, o)
 120 #endif
 121
 122 #define IWL_POLL_INTERVAL 10    /* microseconds */
 123 static inline int _iwl_poll_bit(struct iwl_priv *priv, u32 addr,
 124                                 u32 bits, u32 mask, int timeout)
 125 {
 126         int t = 0;
 127
 128         do {
 129                 if ((_iwl_read32(priv, addr) & mask) == (bits & mask))
 130                         return t;
 131                 udelay(IWL_POLL_INTERVAL);
 132                 t += IWL_POLL_INTERVAL;
 133         } while (t < timeout);
 134
 135         return -ETIMEDOUT;
 136 }
 137 #ifdef CONFIG_IWLWIFI_DEBUG
 138 static inline int __iwl_poll_bit(const char *f, u32 l,
 139                                  struct iwl_priv *priv, u32 addr,
 140                                  u32 bits, u32 mask, int timeout)
 141 {
 142         int ret = _iwl_poll_bit(priv, addr, bits, mask, timeout);
 143         IWL_DEBUG_IO(priv, "poll_bit(0x%08X, 0x%08X, 0x%08X) - %s- %s %d\n",
 144                      addr, bits, mask,
 145                      unlikely(ret  == -ETIMEDOUT) ? "timeout" : "", f, l);
 146         return ret;
 147 }
 148 #define iwl_poll_bit(priv, addr, bits, mask, timeout) \
 149         __iwl_poll_bit(__FILE__, __LINE__, priv, addr, bits, mask, timeout)
 150 #else
 151 #define iwl_poll_bit(p, a, b, m, t) _iwl_poll_bit(p, a, b, m, t)
 152 #endif
 153
 154 static inline void _iwl_set_bit(struct iwl_priv *priv, u32 reg, u32 mask)
 155 {
 156         _iwl_write32(priv, reg, _iwl_read32(priv, reg) | mask);
 157 }
 158 #ifdef CONFIG_IWLWIFI_DEBUG
 159 static inline void __iwl_set_bit(const char *f, u32 l,
 160                                  struct iwl_priv *priv, u32 reg, u32 mask)
 161 {
 162         u32 val = _iwl_read32(priv, reg) | mask;
 163         IWL_DEBUG_IO(priv, "set_bit(0x%08X, 0x%08X) = 0x%08X\n", reg, mask, val);
 164         _iwl_write32(priv, reg, val);
 165 }
 166 static inline void iwl_set_bit(struct iwl_priv *p, u32 r, u32 m)
 167 {
 168         unsigned long reg_flags;
 169
 170         spin_lock_irqsave(&p->reg_lock, reg_flags);
 171         __iwl_set_bit(__FILE__, __LINE__, p, r, m);
 172         spin_unlock_irqrestore(&p->reg_lock, reg_flags);
 173 }
 174 #else
 175 static inline void iwl_set_bit(struct iwl_priv *p, u32 r, u32 m)
 176 {
 177         unsigned long reg_flags;
 178
 179         spin_lock_irqsave(&p->reg_lock, reg_flags);
 180         _iwl_set_bit(p, r, m);
 181         spin_unlock_irqrestore(&p->reg_lock, reg_flags);
 182 }
 183 #endif
 184
 185 static inline void _iwl_clear_bit(struct iwl_priv *priv, u32 reg, u32 mask)
 186 {
 187         _iwl_write32(priv, reg, _iwl_read32(priv, reg) & ~mask);
 188 }
 189 #ifdef CONFIG_IWLWIFI_DEBUG
 190 static inline void __iwl_clear_bit(const char *f, u32 l,
 191                                    struct iwl_priv *priv, u32 reg, u32 mask)
 192 {
 193         u32 val = _iwl_read32(priv, reg) & ~mask;
 194         IWL_DEBUG_IO(priv, "clear_bit(0x%08X, 0x%08X) = 0x%08X\n", reg, mask, val);
 195         _iwl_write32(priv, reg, val);
 196 }
 197 static inline void iwl_clear_bit(struct iwl_priv *p, u32 r, u32 m)
 198 {
 199         unsigned long reg_flags;
 200
 201         spin_lock_irqsave(&p->reg_lock, reg_flags);
 202         __iwl_clear_bit(__FILE__, __LINE__, p, r, m);
 203         spin_unlock_irqrestore(&p->reg_lock, reg_flags);
 204 }
 205 #else
 206 static inline void iwl_clear_bit(struct iwl_priv *p, u32 r, u32 m)
 207 {
 208         unsigned long reg_flags;
 209
 210         spin_lock_irqsave(&p->reg_lock, reg_flags);
 211         _iwl_clear_bit(p, r, m);
 212         spin_unlock_irqrestore(&p->reg_lock, reg_flags);
 213 }
 214 #endif
 215
 216 static inline int _iwl_grab_nic_access(struct iwl_priv *priv)
 217 {
 218         int ret;
 219         u32 val;
 220
 221         /* this bit wakes up the NIC */
 222         _iwl_set_bit(priv, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
 223
 224         /*
 225          * These bits say the device is running, and should keep running for
 226          * at least a short while (at least as long as MAC_ACCESS_REQ stays 1),
 227          * but they do not indicate that embedded SRAM is restored yet;
 228          * 3945 and 4965 have volatile SRAM, and must save/restore contents
 229          * to/from host DRAM when sleeping/waking for power-saving.
 230          * Each direction takes approximately 1/4 millisecond; with this
 231          * overhead, it's a good idea to grab and hold MAC_ACCESS_REQUEST if a
 232          * series of register accesses are expected (e.g. reading Event Log),
 233          * to keep device from sleeping.
 234          *
 235          * CSR_UCODE_DRV_GP1 register bit MAC_SLEEP == 0 indicates that
 236          * SRAM is okay/restored.  We don't check that here because this call
 237          * is just for hardware register access; but GP1 MAC_SLEEP check is a
 238          * good idea before accessing 3945/4965 SRAM (e.g. reading Event Log).
 239          *
 240          * 5000 series and later (including 1000 series) have non-volatile SRAM,
 241          * and do not save/restore SRAM when power cycling.
 242          */
 243         ret = _iwl_poll_bit(priv, CSR_GP_CNTRL,
 244                            CSR_GP_CNTRL_REG_VAL_MAC_ACCESS_EN,
 245                            (CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY |
 246                             CSR_GP_CNTRL_REG_FLAG_GOING_TO_SLEEP), 15000);
 247         if (ret < 0) {
 248                 val = _iwl_read32(priv, CSR_GP_CNTRL);
 249                 IWL_ERR(priv, "MAC is in deep sleep!.  CSR_GP_CNTRL = 0x%08X\n", val);
 250                 _iwl_write32(priv, CSR_RESET, CSR_RESET_REG_FLAG_FORCE_NMI);
 251                 return -EIO;
 252         }
 253
 254         return 0;
 255 }
 256
 257 #ifdef CONFIG_IWLWIFI_DEBUG
 258 static inline int __iwl_grab_nic_access(const char *f, u32 l,
 259                                                struct iwl_priv *priv)
 260 {
 261         IWL_DEBUG_IO(priv, "grabbing nic access - %s %d\n", f, l);
 262         return _iwl_grab_nic_access(priv);
 263 }
 264 #define iwl_grab_nic_access(priv) \
 265         __iwl_grab_nic_access(__FILE__, __LINE__, priv)
 266 #else
 267 #define iwl_grab_nic_access(priv) \
 268         _iwl_grab_nic_access(priv)
 269 #endif
 270
 271 static inline void _iwl_release_nic_access(struct iwl_priv *priv)
 272 {
 273         _iwl_clear_bit(priv, CSR_GP_CNTRL,
 274                         CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
 275 }
 276 #ifdef CONFIG_IWLWIFI_DEBUG
 277 static inline void __iwl_release_nic_access(const char *f, u32 l,
 278                                             struct iwl_priv *priv)
 279 {
 280
 281         IWL_DEBUG_IO(priv, "releasing nic access - %s %d\n", f, l);
 282         _iwl_release_nic_access(priv);
 283 }
 284 #define iwl_release_nic_access(priv) \
 285         __iwl_release_nic_access(__FILE__, __LINE__, priv)
 286 #else
 287 #define iwl_release_nic_access(priv) \
 288         _iwl_release_nic_access(priv)
 289 #endif
 290
 291 static inline u32 _iwl_read_direct32(struct iwl_priv *priv, u32 reg)
 292 {
 293         return _iwl_read32(priv, reg);
 294 }
 295 #ifdef CONFIG_IWLWIFI_DEBUG
 296 static inline u32 __iwl_read_direct32(const char *f, u32 l,
 297                                         struct iwl_priv *priv, u32 reg)
 298 {
 299         u32 value = _iwl_read_direct32(priv, reg);
 300         IWL_DEBUG_IO(priv, "read_direct32(0x%4X) = 0x%08x - %s %d \n", reg, value,
 301                      f, l);
 302         return value;
 303 }
 304 static inline u32 iwl_read_direct32(struct iwl_priv *priv, u32 reg)
 305 {
 306         u32 value;
 307         unsigned long reg_flags;
 308
 309         spin_lock_irqsave(&priv->reg_lock, reg_flags);
 310         iwl_grab_nic_access(priv);
 311         value = __iwl_read_direct32(__FILE__, __LINE__, priv, reg);
 312         iwl_release_nic_access(priv);
 313         spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
 314         return value;
 315 }
 316
 317 #else
 318 static inline u32 iwl_read_direct32(struct iwl_priv *priv, u32 reg)
 319 {
 320         u32 value;
 321         unsigned long reg_flags;
 322
 323         spin_lock_irqsave(&priv->reg_lock, reg_flags);
 324         iwl_grab_nic_access(priv);
 325         value = _iwl_read_direct32(priv, reg);
 326         iwl_release_nic_access(priv);
 327         spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
 328         return value;
 329
 330 }
 331 #endif
 332
 333 static inline void _iwl_write_direct32(struct iwl_priv *priv,
 334                                          u32 reg, u32 value)
 335 {
 336         _iwl_write32(priv, reg, value);
 337 }
 338 static inline void iwl_write_direct32(struct iwl_priv *priv, u32 reg, u32 value)
 339 {
 340         unsigned long reg_flags;
 341
 342         spin_lock_irqsave(&priv->reg_lock, reg_flags);
 343         if (!iwl_grab_nic_access(priv)) {
 344                 _iwl_write_direct32(priv, reg, value);
 345                 iwl_release_nic_access(priv);
 346         }
 347         spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
 348 }
 349
 350 static inline void iwl_write_reg_buf(struct iwl_priv *priv,
 351                                                u32 reg, u32 len, u32 *values)
 352 {
 353         u32 count = sizeof(u32);
 354
 355         if ((priv != NULL) && (values != NULL)) {
 356                 for (; 0 < len; len -= count, reg += count, values++)
 357                         iwl_write_direct32(priv, reg, *values);
 358         }
 359 }
 360
 361 static inline int _iwl_poll_direct_bit(struct iwl_priv *priv, u32 addr,
 362                                        u32 mask, int timeout)
 363 {
 364         int t = 0;
 365
 366         do {
 367                 if ((iwl_read_direct32(priv, addr) & mask) == mask)
 368                         return t;
 369                 udelay(IWL_POLL_INTERVAL);
 370                 t += IWL_POLL_INTERVAL;
 371         } while (t < timeout);
 372
 373         return -ETIMEDOUT;
 374 }
 375
 376 #ifdef CONFIG_IWLWIFI_DEBUG
 377 static inline int __iwl_poll_direct_bit(const char *f, u32 l,
 378                                             struct iwl_priv *priv,
 379                                             u32 addr, u32 mask, int timeout)
 380 {
 381         int ret  = _iwl_poll_direct_bit(priv, addr, mask, timeout);
 382
 383         if (unlikely(ret == -ETIMEDOUT))
 384                 IWL_DEBUG_IO(priv, "poll_direct_bit(0x%08X, 0x%08X) - "
 385                              "timedout - %s %d\n", addr, mask, f, l);
 386         else
 387                 IWL_DEBUG_IO(priv, "poll_direct_bit(0x%08X, 0x%08X) = 0x%08X "
 388                              "- %s %d\n", addr, mask, ret, f, l);
 389         return ret;
 390 }
 391 #define iwl_poll_direct_bit(priv, addr, mask, timeout) \
 392         __iwl_poll_direct_bit(__FILE__, __LINE__, priv, addr, mask, timeout)
 393 #else
 394 #define iwl_poll_direct_bit _iwl_poll_direct_bit
 395 #endif
 396
 397 static inline u32 _iwl_read_prph(struct iwl_priv *priv, u32 reg)
 398 {
 399         _iwl_write_direct32(priv, HBUS_TARG_PRPH_RADDR, reg | (3 << 24));
 400         rmb();
 401         return _iwl_read_direct32(priv, HBUS_TARG_PRPH_RDAT);
 402 }
 403 static inline u32 iwl_read_prph(struct iwl_priv *priv, u32 reg)
 404 {
 405         unsigned long reg_flags;
 406         u32 val;
 407
 408         spin_lock_irqsave(&priv->reg_lock, reg_flags);
 409         iwl_grab_nic_access(priv);
 410         val = _iwl_read_prph(priv, reg);
 411         iwl_release_nic_access(priv);
 412         spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
 413         return val;
 414 }
 415
 416 static inline void _iwl_write_prph(struct iwl_priv *priv,
 417                                              u32 addr, u32 val)
 418 {
 419         _iwl_write_direct32(priv, HBUS_TARG_PRPH_WADDR,
 420                               ((addr & 0x0000FFFF) | (3 << 24)));
 421         wmb();
 422         _iwl_write_direct32(priv, HBUS_TARG_PRPH_WDAT, val);
 423 }
 424
 425 static inline void iwl_write_prph(struct iwl_priv *priv, u32 addr, u32 val)
 426 {
 427         unsigned long reg_flags;
 428
 429         spin_lock_irqsave(&priv->reg_lock, reg_flags);
 430         if (!iwl_grab_nic_access(priv)) {
 431                 _iwl_write_prph(priv, addr, val);
 432                 iwl_release_nic_access(priv);
 433         }
 434         spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
 435 }
 436
 437 #define _iwl_set_bits_prph(priv, reg, mask) \
 438         _iwl_write_prph(priv, reg, (_iwl_read_prph(priv, reg) | mask))
 439
 440 static inline void iwl_set_bits_prph(struct iwl_priv *priv, u32 reg, u32 mask)
 441 {
 442         unsigned long reg_flags;
 443
 444         spin_lock_irqsave(&priv->reg_lock, reg_flags);
 445         iwl_grab_nic_access(priv);
 446         _iwl_set_bits_prph(priv, reg, mask);
 447         iwl_release_nic_access(priv);
 448         spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
 449 }
 450
 451 #define _iwl_set_bits_mask_prph(priv, reg, bits, mask) \
 452         _iwl_write_prph(priv, reg, ((_iwl_read_prph(priv, reg) & mask) | bits))
 453
 454 static inline void iwl_set_bits_mask_prph(struct iwl_priv *priv, u32 reg,
 455                                 u32 bits, u32 mask)
 456 {
 457         unsigned long reg_flags;
 458
 459         spin_lock_irqsave(&priv->reg_lock, reg_flags);
 460         iwl_grab_nic_access(priv);
 461         _iwl_set_bits_mask_prph(priv, reg, bits, mask);
 462         iwl_release_nic_access(priv);
 463         spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
 464 }
 465
 466 static inline void iwl_clear_bits_prph(struct iwl_priv
 467                                                  *priv, u32 reg, u32 mask)
 468 {
 469         unsigned long reg_flags;
 470         u32 val;
 471
 472         spin_lock_irqsave(&priv->reg_lock, reg_flags);
 473         iwl_grab_nic_access(priv);
 474         val = _iwl_read_prph(priv, reg);
 475         _iwl_write_prph(priv, reg, (val & ~mask));
 476         iwl_release_nic_access(priv);
 477         spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
 478 }
 479
 480 static inline u32 iwl_read_targ_mem(struct iwl_priv *priv, u32 addr)
 481 {
 482         unsigned long reg_flags;
 483         u32 value;
 484
 485         spin_lock_irqsave(&priv->reg_lock, reg_flags);
 486         iwl_grab_nic_access(priv);
 487
 488         _iwl_write_direct32(priv, HBUS_TARG_MEM_RADDR, addr);
 489         rmb();
 490         value = _iwl_read_direct32(priv, HBUS_TARG_MEM_RDAT);
 491
 492         iwl_release_nic_access(priv);
 493         spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
 494         return value;
 495 }
 496
 497 static inline void iwl_write_targ_mem(struct iwl_priv *priv, u32 addr, u32 val)
 498 {
 499         unsigned long reg_flags;
 500
 501         spin_lock_irqsave(&priv->reg_lock, reg_flags);
 502         if (!iwl_grab_nic_access(priv)) {
 503                 _iwl_write_direct32(priv, HBUS_TARG_MEM_WADDR, addr);
 504                 wmb();
 505                 _iwl_write_direct32(priv, HBUS_TARG_MEM_WDAT, val);
 506                 iwl_release_nic_access(priv);
 507         }
 508         spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
 509 }
 510
 511 static inline void iwl_write_targ_mem_buf(struct iwl_priv *priv, u32 addr,
 512                                           u32 len, u32 *values)
 513 {
 514         unsigned long reg_flags;
 515
 516         spin_lock_irqsave(&priv->reg_lock, reg_flags);
 517         if (!iwl_grab_nic_access(priv)) {
 518                 _iwl_write_direct32(priv, HBUS_TARG_MEM_WADDR, addr);
 519                 wmb();
 520                 for (; 0 < len; len -= sizeof(u32), values++)
 521                         _iwl_write_direct32(priv, HBUS_TARG_MEM_WDAT, *values);
 522
 523                 iwl_release_nic_access(priv);
 524         }
 525         spin_unlock_irqrestore(&priv->reg_lock, reg_flags);
 526 }
 527 #endif