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

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2003 - 2012 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 #include <linux/delay.h>
  29 #include <linux/device.h>
  30 #include <linux/export.h>
  31
  32 #include "iwl-io.h"
  33 #include "iwl-csr.h"
  34 #include "iwl-debug.h"
  35
  36 #define IWL_POLL_INTERVAL 10    /* microseconds */
  37
  38 void __iwl_set_bit(struct iwl_trans *trans, u32 reg, u32 mask)
  39 {
  40         iwl_write32(trans, reg, iwl_read32(trans, reg) | mask);
  41 }
  42
  43 void __iwl_clear_bit(struct iwl_trans *trans, u32 reg, u32 mask)
  44 {
  45         iwl_write32(trans, reg, iwl_read32(trans, reg) & ~mask);
  46 }
  47
  48 void iwl_set_bit(struct iwl_trans *trans, u32 reg, u32 mask)
  49 {
  50         unsigned long flags;
  51
  52         spin_lock_irqsave(&trans->reg_lock, flags);
  53         __iwl_set_bit(trans, reg, mask);
  54         spin_unlock_irqrestore(&trans->reg_lock, flags);
  55 }
  56 EXPORT_SYMBOL_GPL(iwl_set_bit);
  57
  58 void iwl_clear_bit(struct iwl_trans *trans, u32 reg, u32 mask)
  59 {
  60         unsigned long flags;
  61
  62         spin_lock_irqsave(&trans->reg_lock, flags);
  63         __iwl_clear_bit(trans, reg, mask);
  64         spin_unlock_irqrestore(&trans->reg_lock, flags);
  65 }
  66 EXPORT_SYMBOL_GPL(iwl_clear_bit);
  67
  68 void iwl_set_bits_mask(struct iwl_trans *trans, u32 reg, u32 mask, u32 value)
  69 {
  70         unsigned long flags;
  71         u32 v;
  72
  73 #ifdef CONFIG_IWLWIFI_DEBUG
  74         WARN_ON_ONCE(value & ~mask);
  75 #endif
  76
  77         spin_lock_irqsave(&trans->reg_lock, flags);
  78         v = iwl_read32(trans, reg);
  79         v &= ~mask;
  80         v |= value;
  81         iwl_write32(trans, reg, v);
  82         spin_unlock_irqrestore(&trans->reg_lock, flags);
  83 }
  84 EXPORT_SYMBOL_GPL(iwl_set_bits_mask);
  85
  86 int iwl_poll_bit(struct iwl_trans *trans, u32 addr,
  87                  u32 bits, u32 mask, int timeout)
  88 {
  89         int t = 0;
  90
  91         do {
  92                 if ((iwl_read32(trans, addr) & mask) == (bits & mask))
  93                         return t;
  94                 udelay(IWL_POLL_INTERVAL);
  95                 t += IWL_POLL_INTERVAL;
  96         } while (t < timeout);
  97
  98         return -ETIMEDOUT;
  99 }
 100 EXPORT_SYMBOL_GPL(iwl_poll_bit);
 101
 102 u32 iwl_read_direct32(struct iwl_trans *trans, u32 reg)
 103 {
 104         u32 value = 0x5a5a5a5a;
 105         unsigned long flags;
 106
 107         spin_lock_irqsave(&trans->reg_lock, flags);
 108         if (iwl_trans_grab_nic_access(trans, false)) {
 109                 value = iwl_read32(trans, reg);
 110                 iwl_trans_release_nic_access(trans);
 111         }
 112         spin_unlock_irqrestore(&trans->reg_lock, flags);
 113
 114         return value;
 115 }
 116 EXPORT_SYMBOL_GPL(iwl_read_direct32);
 117
 118 void iwl_write_direct32(struct iwl_trans *trans, u32 reg, u32 value)
 119 {
 120         unsigned long flags;
 121
 122         spin_lock_irqsave(&trans->reg_lock, flags);
 123         if (iwl_trans_grab_nic_access(trans, false)) {
 124                 iwl_write32(trans, reg, value);
 125                 iwl_trans_release_nic_access(trans);
 126         }
 127         spin_unlock_irqrestore(&trans->reg_lock, flags);
 128 }
 129 EXPORT_SYMBOL_GPL(iwl_write_direct32);
 130
 131 int iwl_poll_direct_bit(struct iwl_trans *trans, u32 addr, u32 mask,
 132                         int timeout)
 133 {
 134         int t = 0;
 135
 136         do {
 137                 if ((iwl_read_direct32(trans, addr) & mask) == mask)
 138                         return t;
 139                 udelay(IWL_POLL_INTERVAL);
 140                 t += IWL_POLL_INTERVAL;
 141         } while (t < timeout);
 142
 143         return -ETIMEDOUT;
 144 }
 145 EXPORT_SYMBOL_GPL(iwl_poll_direct_bit);
 146
 147 static inline u32 __iwl_read_prph(struct iwl_trans *trans, u32 ofs)
 148 {
 149         u32 val = iwl_trans_read_prph(trans, ofs);
 150         trace_iwlwifi_dev_ioread_prph32(trans->dev, ofs, val);
 151         return val;
 152 }
 153
 154 static inline void __iwl_write_prph(struct iwl_trans *trans, u32 ofs, u32 val)
 155 {
 156         trace_iwlwifi_dev_iowrite_prph32(trans->dev, ofs, val);
 157         iwl_trans_write_prph(trans, ofs, val);
 158 }
 159
 160 u32 iwl_read_prph(struct iwl_trans *trans, u32 ofs)
 161 {
 162         unsigned long flags;
 163         u32 val = 0x5a5a5a5a;
 164
 165         spin_lock_irqsave(&trans->reg_lock, flags);
 166         if (iwl_trans_grab_nic_access(trans, false)) {
 167                 val = __iwl_read_prph(trans, ofs);
 168                 iwl_trans_release_nic_access(trans);
 169         }
 170         spin_unlock_irqrestore(&trans->reg_lock, flags);
 171         return val;
 172 }
 173 EXPORT_SYMBOL_GPL(iwl_read_prph);
 174
 175 void iwl_write_prph(struct iwl_trans *trans, u32 ofs, u32 val)
 176 {
 177         unsigned long flags;
 178
 179         spin_lock_irqsave(&trans->reg_lock, flags);
 180         if (iwl_trans_grab_nic_access(trans, false)) {
 181                 __iwl_write_prph(trans, ofs, val);
 182                 iwl_trans_release_nic_access(trans);
 183         }
 184         spin_unlock_irqrestore(&trans->reg_lock, flags);
 185 }
 186 EXPORT_SYMBOL_GPL(iwl_write_prph);
 187
 188 void iwl_set_bits_prph(struct iwl_trans *trans, u32 ofs, u32 mask)
 189 {
 190         unsigned long flags;
 191
 192         spin_lock_irqsave(&trans->reg_lock, flags);
 193         if (iwl_trans_grab_nic_access(trans, false)) {
 194                 __iwl_write_prph(trans, ofs,
 195                                  __iwl_read_prph(trans, ofs) | mask);
 196                 iwl_trans_release_nic_access(trans);
 197         }
 198         spin_unlock_irqrestore(&trans->reg_lock, flags);
 199 }
 200 EXPORT_SYMBOL_GPL(iwl_set_bits_prph);
 201
 202 void iwl_set_bits_mask_prph(struct iwl_trans *trans, u32 ofs,
 203                             u32 bits, u32 mask)
 204 {
 205         unsigned long flags;
 206
 207         spin_lock_irqsave(&trans->reg_lock, flags);
 208         if (iwl_trans_grab_nic_access(trans, false)) {
 209                 __iwl_write_prph(trans, ofs,
 210                                  (__iwl_read_prph(trans, ofs) & mask) | bits);
 211                 iwl_trans_release_nic_access(trans);
 212         }
 213         spin_unlock_irqrestore(&trans->reg_lock, flags);
 214 }
 215 EXPORT_SYMBOL_GPL(iwl_set_bits_mask_prph);
 216
 217 void iwl_clear_bits_prph(struct iwl_trans *trans, u32 ofs, u32 mask)
 218 {
 219         unsigned long flags;
 220         u32 val;
 221
 222         spin_lock_irqsave(&trans->reg_lock, flags);
 223         if (iwl_trans_grab_nic_access(trans, false)) {
 224                 val = __iwl_read_prph(trans, ofs);
 225                 __iwl_write_prph(trans, ofs, (val & ~mask));
 226                 iwl_trans_release_nic_access(trans);
 227         }
 228         spin_unlock_irqrestore(&trans->reg_lock, flags);
 229 }
 230 EXPORT_SYMBOL_GPL(iwl_clear_bits_prph);