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

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2003 - 2009 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
  36 /*
  37  * IO, register, and NIC memory access functions
  38  *
  39  * NOTE on naming convention and macro usage for these
  40  *
  41  * A single _ prefix before a an access function means that no state
  42  * check or debug information is printed when that function is called.
  43  *
  44  * A double __ prefix before an access function means that state is checked
  45  * and the current line number and caller function name are printed in addition
  46  * to any other debug output.
  47  *
  48  * The non-prefixed name is the #define that maps the caller into a
  49  * #define that provides the caller's name and __LINE__ to the double
  50  * prefix version.
  51  *
  52  * If you wish to call the function without any debug or state checking,
  53  * you should use the single _ prefix version (as is used by dependent IO
  54  * routines, for example _iwl_read_direct32 calls the non-check version of
  55  * _iwl_read32.)
  56  *
  57  * These declarations are *extremely* useful in quickly isolating code deltas
  58  * which result in misconfiguration of the hardware I/O.  In combination with
  59  * git-bisect and the IO debug level you can quickly determine the specific
  60  * commit which breaks the IO sequence to the hardware.
  61  *
  62  */
  63
  64 #define _iwl_write32(priv, ofs, val) iowrite32((val), (priv)->hw_base + (ofs))
  65 #ifdef CONFIG_IWLWIFI_DEBUG
  66 static inline void __iwl_write32(const char *f, u32 l, struct iwl_priv *priv,
  67                                  u32 ofs, u32 val)
  68 {
  69         IWL_DEBUG_IO(priv, "write32(0x%08X, 0x%08X) - %s %d\n", ofs, val, f, l);
  70         _iwl_write32(priv, ofs, val);
  71 }
  72 #define iwl_write32(priv, ofs, val) \
  73         __iwl_write32(__FILE__, __LINE__, priv, ofs, val)
  74 #else
  75 #define iwl_write32(priv, ofs, val) _iwl_write32(priv, ofs, val)
  76 #endif
  77
  78 #define _iwl_read32(priv, ofs) ioread32((priv)->hw_base + (ofs))
  79 #ifdef CONFIG_IWLWIFI_DEBUG
  80 static inline u32 __iwl_read32(char *f, u32 l, struct iwl_priv *priv, u32 ofs)
  81 {
  82         IWL_DEBUG_IO(priv, "read_direct32(0x%08X) - %s %d\n", ofs, f, l);
  83         return _iwl_read32(priv, ofs);
  84 }
  85 #define iwl_read32(priv, ofs) __iwl_read32(__FILE__, __LINE__, priv, ofs)
  86 #else
  87 #define iwl_read32(p, o) _iwl_read32(p, o)
  88 #endif
  89
  90 #define IWL_POLL_INTERVAL 10    /* microseconds */
  91 static inline int _iwl_poll_bit(struct iwl_priv *priv, u32 addr,
  92                                 u32 bits, u32 mask, int timeout)
  93 {
  94         int t = 0;
  95
  96         do {
  97                 if ((_iwl_read32(priv, addr) & mask) == (bits & mask))
  98                         return t;
  99                 udelay(IWL_POLL_INTERVAL);
 100                 t += IWL_POLL_INTERVAL;
 101         } while (t < timeout);
 102
 103         return -ETIMEDOUT;
 104 }
 105 #ifdef CONFIG_IWLWIFI_DEBUG
 106 static inline int __iwl_poll_bit(const char *f, u32 l,
 107                                  struct iwl_priv *priv, u32 addr,
 108                                  u32 bits, u32 mask, int timeout)
 109 {
 110         int ret = _iwl_poll_bit(priv, addr, bits, mask, timeout);
 111         IWL_DEBUG_IO(priv, "poll_bit(0x%08X, 0x%08X, 0x%08X) - %s- %s %d\n",
 112                      addr, bits, mask,
 113                      unlikely(ret  == -ETIMEDOUT) ? "timeout" : "", f, l);
 114         return ret;
 115 }
 116 #define iwl_poll_bit(priv, addr, bits, mask, timeout) \
 117         __iwl_poll_bit(__FILE__, __LINE__, priv, addr, bits, mask, timeout)
 118 #else
 119 #define iwl_poll_bit(p, a, b, m, t) _iwl_poll_bit(p, a, b, m, t)
 120 #endif
 121
 122 static inline void _iwl_set_bit(struct iwl_priv *priv, u32 reg, u32 mask)
 123 {
 124         _iwl_write32(priv, reg, _iwl_read32(priv, reg) | mask);
 125 }
 126 #ifdef CONFIG_IWLWIFI_DEBUG
 127 static inline void __iwl_set_bit(const char *f, u32 l,
 128                                  struct iwl_priv *priv, u32 reg, u32 mask)
 129 {
 130         u32 val = _iwl_read32(priv, reg) | mask;
 131         IWL_DEBUG_IO(priv, "set_bit(0x%08X, 0x%08X) = 0x%08X\n", reg, mask, val);
 132         _iwl_write32(priv, reg, val);
 133 }
 134 #define iwl_set_bit(p, r, m) __iwl_set_bit(__FILE__, __LINE__, p, r, m)
 135 #else
 136 #define iwl_set_bit(p, r, m) _iwl_set_bit(p, r, m)
 137 #endif
 138
 139 static inline void _iwl_clear_bit(struct iwl_priv *priv, u32 reg, u32 mask)
 140 {
 141         _iwl_write32(priv, reg, _iwl_read32(priv, reg) & ~mask);
 142 }
 143 #ifdef CONFIG_IWLWIFI_DEBUG
 144 static inline void __iwl_clear_bit(const char *f, u32 l,
 145                                    struct iwl_priv *priv, u32 reg, u32 mask)
 146 {
 147         u32 val = _iwl_read32(priv, reg) & ~mask;
 148         IWL_DEBUG_IO(priv, "clear_bit(0x%08X, 0x%08X) = 0x%08X\n", reg, mask, val);
 149         _iwl_write32(priv, reg, val);
 150 }
 151 #define iwl_clear_bit(p, r, m) __iwl_clear_bit(__FILE__, __LINE__, p, r, m)
 152 #else
 153 #define iwl_clear_bit(p, r, m) _iwl_clear_bit(p, r, m)
 154 #endif
 155
 156 static inline int _iwl_grab_nic_access(struct iwl_priv *priv)
 157 {
 158         int ret;
 159 #ifdef CONFIG_IWLWIFI_DEBUG
 160         if (atomic_read(&priv->restrict_refcnt))
 161                 return 0;
 162 #endif
 163         /* this bit wakes up the NIC */
 164         _iwl_set_bit(priv, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
 165         ret = _iwl_poll_bit(priv, CSR_GP_CNTRL,
 166                            CSR_GP_CNTRL_REG_VAL_MAC_ACCESS_EN,
 167                            (CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY |
 168                             CSR_GP_CNTRL_REG_FLAG_GOING_TO_SLEEP), 15000);
 169         if (ret < 0) {
 170                 IWL_ERR(priv, "MAC is in deep sleep!\n");
 171                 return -EIO;
 172         }
 173
 174 #ifdef CONFIG_IWLWIFI_DEBUG
 175         atomic_inc(&priv->restrict_refcnt);
 176 #endif
 177         return 0;
 178 }
 179
 180 #ifdef CONFIG_IWLWIFI_DEBUG
 181 static inline int __iwl_grab_nic_access(const char *f, u32 l,
 182                                                struct iwl_priv *priv)
 183 {
 184         if (atomic_read(&priv->restrict_refcnt))
 185                 IWL_ERR(priv, "Grabbing access while already held %s %d.\n", f, l);
 186
 187         IWL_DEBUG_IO(priv, "grabbing nic access - %s %d\n", f, l);
 188         return _iwl_grab_nic_access(priv);
 189 }
 190 #define iwl_grab_nic_access(priv) \
 191         __iwl_grab_nic_access(__FILE__, __LINE__, priv)
 192 #else
 193 #define iwl_grab_nic_access(priv) \
 194         _iwl_grab_nic_access(priv)
 195 #endif
 196
 197 static inline void _iwl_release_nic_access(struct iwl_priv *priv)
 198 {
 199 #ifdef CONFIG_IWLWIFI_DEBUG
 200         if (atomic_dec_and_test(&priv->restrict_refcnt))
 201 #endif
 202                 _iwl_clear_bit(priv, CSR_GP_CNTRL,
 203                                CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
 204 }
 205 #ifdef CONFIG_IWLWIFI_DEBUG
 206 static inline void __iwl_release_nic_access(const char *f, u32 l,
 207                                             struct iwl_priv *priv)
 208 {
 209         if (atomic_read(&priv->restrict_refcnt) <= 0)
 210                 IWL_ERR(priv, "Release unheld nic access at line %s %d.\n", f, l);
 211
 212         IWL_DEBUG_IO(priv, "releasing nic access - %s %d\n", f, l);
 213         _iwl_release_nic_access(priv);
 214 }
 215 #define iwl_release_nic_access(priv) \
 216         __iwl_release_nic_access(__FILE__, __LINE__, priv)
 217 #else
 218 #define iwl_release_nic_access(priv) \
 219         _iwl_release_nic_access(priv)
 220 #endif
 221
 222 static inline u32 _iwl_read_direct32(struct iwl_priv *priv, u32 reg)
 223 {
 224         return _iwl_read32(priv, reg);
 225 }
 226 #ifdef CONFIG_IWLWIFI_DEBUG
 227 static inline u32 __iwl_read_direct32(const char *f, u32 l,
 228                                         struct iwl_priv *priv, u32 reg)
 229 {
 230         u32 value = _iwl_read_direct32(priv, reg);
 231         if (!atomic_read(&priv->restrict_refcnt))
 232                 IWL_ERR(priv, "Nic access not held from %s %d\n", f, l);
 233         IWL_DEBUG_IO(priv, "read_direct32(0x%4X) = 0x%08x - %s %d \n", reg, value,
 234                      f, l);
 235         return value;
 236 }
 237 #define iwl_read_direct32(priv, reg) \
 238         __iwl_read_direct32(__FILE__, __LINE__, priv, reg)
 239 #else
 240 #define iwl_read_direct32 _iwl_read_direct32
 241 #endif
 242
 243 static inline void _iwl_write_direct32(struct iwl_priv *priv,
 244                                          u32 reg, u32 value)
 245 {
 246         _iwl_write32(priv, reg, value);
 247 }
 248 #ifdef CONFIG_IWLWIFI_DEBUG
 249 static void __iwl_write_direct32(const char *f , u32 line,
 250                                    struct iwl_priv *priv, u32 reg, u32 value)
 251 {
 252         if (!atomic_read(&priv->restrict_refcnt))
 253                 IWL_ERR(priv, "Nic access not held from %s line %d\n", f, line);
 254         _iwl_write_direct32(priv, reg, value);
 255 }
 256 #define iwl_write_direct32(priv, reg, value) \
 257         __iwl_write_direct32(__func__, __LINE__, priv, reg, value)
 258 #else
 259 #define iwl_write_direct32 _iwl_write_direct32
 260 #endif
 261
 262 static inline void iwl_write_reg_buf(struct iwl_priv *priv,
 263                                                u32 reg, u32 len, u32 *values)
 264 {
 265         u32 count = sizeof(u32);
 266
 267         if ((priv != NULL) && (values != NULL)) {
 268                 for (; 0 < len; len -= count, reg += count, values++)
 269                         _iwl_write_direct32(priv, reg, *values);
 270         }
 271 }
 272
 273 static inline int _iwl_poll_direct_bit(struct iwl_priv *priv, u32 addr,
 274                                        u32 mask, int timeout)
 275 {
 276         return _iwl_poll_bit(priv, addr, mask, mask, timeout);
 277 }
 278
 279 #ifdef CONFIG_IWLWIFI_DEBUG
 280 static inline int __iwl_poll_direct_bit(const char *f, u32 l,
 281                                             struct iwl_priv *priv,
 282                                             u32 addr, u32 mask, int timeout)
 283 {
 284         int ret  = _iwl_poll_direct_bit(priv, addr, mask, timeout);
 285
 286         if (unlikely(ret == -ETIMEDOUT))
 287                 IWL_DEBUG_IO(priv, "poll_direct_bit(0x%08X, 0x%08X) - "
 288                              "timedout - %s %d\n", addr, mask, f, l);
 289         else
 290                 IWL_DEBUG_IO(priv, "poll_direct_bit(0x%08X, 0x%08X) = 0x%08X "
 291                              "- %s %d\n", addr, mask, ret, f, l);
 292         return ret;
 293 }
 294 #define iwl_poll_direct_bit(priv, addr, mask, timeout) \
 295         __iwl_poll_direct_bit(__FILE__, __LINE__, priv, addr, mask, timeout)
 296 #else
 297 #define iwl_poll_direct_bit _iwl_poll_direct_bit
 298 #endif
 299
 300 static inline u32 _iwl_read_prph(struct iwl_priv *priv, u32 reg)
 301 {
 302         _iwl_write_direct32(priv, HBUS_TARG_PRPH_RADDR, reg | (3 << 24));
 303         rmb();
 304         return _iwl_read_direct32(priv, HBUS_TARG_PRPH_RDAT);
 305 }
 306 #ifdef CONFIG_IWLWIFI_DEBUG
 307 static inline u32 __iwl_read_prph(const char *f, u32 line,
 308                                   struct iwl_priv *priv, u32 reg)
 309 {
 310         if (!atomic_read(&priv->restrict_refcnt))
 311                 IWL_ERR(priv, "Nic access not held from %s line %d\n", f, line);
 312         return _iwl_read_prph(priv, reg);
 313 }
 314
 315 #define iwl_read_prph(priv, reg) \
 316         __iwl_read_prph(__func__, __LINE__, priv, reg)
 317 #else
 318 #define iwl_read_prph _iwl_read_prph
 319 #endif
 320
 321 static inline void _iwl_write_prph(struct iwl_priv *priv,
 322                                              u32 addr, u32 val)
 323 {
 324         _iwl_write_direct32(priv, HBUS_TARG_PRPH_WADDR,
 325                               ((addr & 0x0000FFFF) | (3 << 24)));
 326         wmb();
 327         _iwl_write_direct32(priv, HBUS_TARG_PRPH_WDAT, val);
 328 }
 329 #ifdef CONFIG_IWLWIFI_DEBUG
 330 static inline void __iwl_write_prph(const char *f, u32 line,
 331                                     struct iwl_priv *priv, u32 addr, u32 val)
 332 {
 333         if (!atomic_read(&priv->restrict_refcnt))
 334                 IWL_ERR(priv, "Nic access not held from %s line %d\n", f, line);
 335         _iwl_write_prph(priv, addr, val);
 336 }
 337
 338 #define iwl_write_prph(priv, addr, val) \
 339         __iwl_write_prph(__func__, __LINE__, priv, addr, val);
 340 #else
 341 #define iwl_write_prph _iwl_write_prph
 342 #endif
 343
 344 #define _iwl_set_bits_prph(priv, reg, mask) \
 345         _iwl_write_prph(priv, reg, (_iwl_read_prph(priv, reg) | mask))
 346 #ifdef CONFIG_IWLWIFI_DEBUG
 347 static inline void __iwl_set_bits_prph(const char *f, u32 line,
 348                                        struct iwl_priv *priv,
 349                                        u32 reg, u32 mask)
 350 {
 351         if (!atomic_read(&priv->restrict_refcnt))
 352                 IWL_ERR(priv, "Nic access not held from %s line %d\n", f, line);
 353
 354         _iwl_set_bits_prph(priv, reg, mask);
 355 }
 356 #define iwl_set_bits_prph(priv, reg, mask) \
 357         __iwl_set_bits_prph(__func__, __LINE__, priv, reg, mask)
 358 #else
 359 #define iwl_set_bits_prph _iwl_set_bits_prph
 360 #endif
 361
 362 #define _iwl_set_bits_mask_prph(priv, reg, bits, mask) \
 363         _iwl_write_prph(priv, reg, ((_iwl_read_prph(priv, reg) & mask) | bits))
 364
 365 #ifdef CONFIG_IWLWIFI_DEBUG
 366 static inline void __iwl_set_bits_mask_prph(const char *f, u32 line,
 367                 struct iwl_priv *priv, u32 reg, u32 bits, u32 mask)
 368 {
 369         if (!atomic_read(&priv->restrict_refcnt))
 370                 IWL_ERR(priv, "Nic access not held from %s line %d\n", f, line);
 371         _iwl_set_bits_mask_prph(priv, reg, bits, mask);
 372 }
 373 #define iwl_set_bits_mask_prph(priv, reg, bits, mask) \
 374         __iwl_set_bits_mask_prph(__func__, __LINE__, priv, reg, bits, mask)
 375 #else
 376 #define iwl_set_bits_mask_prph _iwl_set_bits_mask_prph
 377 #endif
 378
 379 static inline void iwl_clear_bits_prph(struct iwl_priv
 380                                                  *priv, u32 reg, u32 mask)
 381 {
 382         u32 val = _iwl_read_prph(priv, reg);
 383         _iwl_write_prph(priv, reg, (val & ~mask));
 384 }
 385
 386 static inline u32 iwl_read_targ_mem(struct iwl_priv *priv, u32 addr)
 387 {
 388         iwl_write_direct32(priv, HBUS_TARG_MEM_RADDR, addr);
 389         rmb();
 390         return iwl_read_direct32(priv, HBUS_TARG_MEM_RDAT);
 391 }
 392
 393 static inline void iwl_write_targ_mem(struct iwl_priv *priv, u32 addr, u32 val)
 394 {
 395         iwl_write_direct32(priv, HBUS_TARG_MEM_WADDR, addr);
 396         wmb();
 397         iwl_write_direct32(priv, HBUS_TARG_MEM_WDAT, val);
 398 }
 399
 400 static inline void iwl_write_targ_mem_buf(struct iwl_priv *priv, u32 addr,
 401                                           u32 len, u32 *values)
 402 {
 403         iwl_write_direct32(priv, HBUS_TARG_MEM_WADDR, addr);
 404         wmb();
 405         for (; 0 < len; len -= sizeof(u32), values++)
 406                 iwl_write_direct32(priv, HBUS_TARG_MEM_WDAT, *values);
 407 }
 408 #endif