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

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2003 - 2014 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-drv.h"
  33 #include "iwl-io.h"
  34 #include "iwl-csr.h"
  35 #include "iwl-debug.h"
  36 #include "iwl-fh.h"
  37
  38 #define IWL_POLL_INTERVAL 10    /* microseconds */
  39
  40 int iwl_poll_bit(struct iwl_trans *trans, u32 addr,
  41                  u32 bits, u32 mask, int timeout)
  42 {
  43         int t = 0;
  44
  45         do {
  46                 if ((iwl_read32(trans, addr) & mask) == (bits & mask))
  47                         return t;
  48                 udelay(IWL_POLL_INTERVAL);
  49                 t += IWL_POLL_INTERVAL;
  50         } while (t < timeout);
  51
  52         return -ETIMEDOUT;
  53 }
  54 IWL_EXPORT_SYMBOL(iwl_poll_bit);
  55
  56 u32 iwl_read_direct32(struct iwl_trans *trans, u32 reg)
  57 {
  58         u32 value = 0x5a5a5a5a;
  59         unsigned long flags;
  60         if (iwl_trans_grab_nic_access(trans, false, &flags)) {
  61                 value = iwl_read32(trans, reg);
  62                 iwl_trans_release_nic_access(trans, &flags);
  63         }
  64
  65         return value;
  66 }
  67 IWL_EXPORT_SYMBOL(iwl_read_direct32);
  68
  69 void iwl_write_direct32(struct iwl_trans *trans, u32 reg, u32 value)
  70 {
  71         unsigned long flags;
  72
  73         if (iwl_trans_grab_nic_access(trans, false, &flags)) {
  74                 iwl_write32(trans, reg, value);
  75                 iwl_trans_release_nic_access(trans, &flags);
  76         }
  77 }
  78 IWL_EXPORT_SYMBOL(iwl_write_direct32);
  79
  80 int iwl_poll_direct_bit(struct iwl_trans *trans, u32 addr, u32 mask,
  81                         int timeout)
  82 {
  83         int t = 0;
  84
  85         do {
  86                 if ((iwl_read_direct32(trans, addr) & mask) == mask)
  87                         return t;
  88                 udelay(IWL_POLL_INTERVAL);
  89                 t += IWL_POLL_INTERVAL;
  90         } while (t < timeout);
  91
  92         return -ETIMEDOUT;
  93 }
  94 IWL_EXPORT_SYMBOL(iwl_poll_direct_bit);
  95
  96 static inline u32 __iwl_read_prph(struct iwl_trans *trans, u32 ofs)
  97 {
  98         u32 val = iwl_trans_read_prph(trans, ofs);
  99         trace_iwlwifi_dev_ioread_prph32(trans->dev, ofs, val);
 100         return val;
 101 }
 102
 103 static inline void __iwl_write_prph(struct iwl_trans *trans, u32 ofs, u32 val)
 104 {
 105         trace_iwlwifi_dev_iowrite_prph32(trans->dev, ofs, val);
 106         iwl_trans_write_prph(trans, ofs, val);
 107 }
 108
 109 u32 iwl_read_prph(struct iwl_trans *trans, u32 ofs)
 110 {
 111         unsigned long flags;
 112         u32 val = 0x5a5a5a5a;
 113
 114         if (iwl_trans_grab_nic_access(trans, false, &flags)) {
 115                 val = __iwl_read_prph(trans, ofs);
 116                 iwl_trans_release_nic_access(trans, &flags);
 117         }
 118         return val;
 119 }
 120 IWL_EXPORT_SYMBOL(iwl_read_prph);
 121
 122 void iwl_write_prph(struct iwl_trans *trans, u32 ofs, u32 val)
 123 {
 124         unsigned long flags;
 125
 126         if (iwl_trans_grab_nic_access(trans, false, &flags)) {
 127                 __iwl_write_prph(trans, ofs, val);
 128                 iwl_trans_release_nic_access(trans, &flags);
 129         }
 130 }
 131 IWL_EXPORT_SYMBOL(iwl_write_prph);
 132
 133 void iwl_set_bits_prph(struct iwl_trans *trans, u32 ofs, u32 mask)
 134 {
 135         unsigned long flags;
 136
 137         if (iwl_trans_grab_nic_access(trans, false, &flags)) {
 138                 __iwl_write_prph(trans, ofs,
 139                                  __iwl_read_prph(trans, ofs) | mask);
 140                 iwl_trans_release_nic_access(trans, &flags);
 141         }
 142 }
 143 IWL_EXPORT_SYMBOL(iwl_set_bits_prph);
 144
 145 void iwl_set_bits_mask_prph(struct iwl_trans *trans, u32 ofs,
 146                             u32 bits, u32 mask)
 147 {
 148         unsigned long flags;
 149
 150         if (iwl_trans_grab_nic_access(trans, false, &flags)) {
 151                 __iwl_write_prph(trans, ofs,
 152                                  (__iwl_read_prph(trans, ofs) & mask) | bits);
 153                 iwl_trans_release_nic_access(trans, &flags);
 154         }
 155 }
 156 IWL_EXPORT_SYMBOL(iwl_set_bits_mask_prph);
 157
 158 void iwl_clear_bits_prph(struct iwl_trans *trans, u32 ofs, u32 mask)
 159 {
 160         unsigned long flags;
 161         u32 val;
 162
 163         if (iwl_trans_grab_nic_access(trans, false, &flags)) {
 164                 val = __iwl_read_prph(trans, ofs);
 165                 __iwl_write_prph(trans, ofs, (val & ~mask));
 166                 iwl_trans_release_nic_access(trans, &flags);
 167         }
 168 }
 169 IWL_EXPORT_SYMBOL(iwl_clear_bits_prph);
 170
 171 static const char *get_fh_string(int cmd)
 172 {
 173 #define IWL_CMD(x) case x: return #x
 174         switch (cmd) {
 175         IWL_CMD(FH_RSCSR_CHNL0_STTS_WPTR_REG);
 176         IWL_CMD(FH_RSCSR_CHNL0_RBDCB_BASE_REG);
 177         IWL_CMD(FH_RSCSR_CHNL0_WPTR);
 178         IWL_CMD(FH_MEM_RCSR_CHNL0_CONFIG_REG);
 179         IWL_CMD(FH_MEM_RSSR_SHARED_CTRL_REG);
 180         IWL_CMD(FH_MEM_RSSR_RX_STATUS_REG);
 181         IWL_CMD(FH_MEM_RSSR_RX_ENABLE_ERR_IRQ2DRV);
 182         IWL_CMD(FH_TSSR_TX_STATUS_REG);
 183         IWL_CMD(FH_TSSR_TX_ERROR_REG);
 184         default:
 185                 return "UNKNOWN";
 186         }
 187 #undef IWL_CMD
 188 }
 189
 190 int iwl_dump_fh(struct iwl_trans *trans, char **buf)
 191 {
 192         int i;
 193         static const u32 fh_tbl[] = {
 194                 FH_RSCSR_CHNL0_STTS_WPTR_REG,
 195                 FH_RSCSR_CHNL0_RBDCB_BASE_REG,
 196                 FH_RSCSR_CHNL0_WPTR,
 197                 FH_MEM_RCSR_CHNL0_CONFIG_REG,
 198                 FH_MEM_RSSR_SHARED_CTRL_REG,
 199                 FH_MEM_RSSR_RX_STATUS_REG,
 200                 FH_MEM_RSSR_RX_ENABLE_ERR_IRQ2DRV,
 201                 FH_TSSR_TX_STATUS_REG,
 202                 FH_TSSR_TX_ERROR_REG
 203         };
 204
 205 #ifdef CONFIG_IWLWIFI_DEBUGFS
 206         if (buf) {
 207                 int pos = 0;
 208                 size_t bufsz = ARRAY_SIZE(fh_tbl) * 48 + 40;
 209
 210                 *buf = kmalloc(bufsz, GFP_KERNEL);
 211                 if (!*buf)
 212                         return -ENOMEM;
 213
 214                 pos += scnprintf(*buf + pos, bufsz - pos,
 215                                 "FH register values:\n");
 216
 217                 for (i = 0; i < ARRAY_SIZE(fh_tbl); i++)
 218                         pos += scnprintf(*buf + pos, bufsz - pos,
 219                                 "  %34s: 0X%08x\n",
 220                                 get_fh_string(fh_tbl[i]),
 221                                 iwl_read_direct32(trans, fh_tbl[i]));
 222
 223                 return pos;
 224         }
 225 #endif
 226
 227         IWL_ERR(trans, "FH register values:\n");
 228         for (i = 0; i <  ARRAY_SIZE(fh_tbl); i++)
 229                 IWL_ERR(trans, "  %34s: 0X%08x\n",
 230                         get_fh_string(fh_tbl[i]),
 231                         iwl_read_direct32(trans, fh_tbl[i]));
 232
 233         return 0;
 234 }