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-prph.h"
  37 #include "iwl-fh.h"
  38
  39 #define IWL_POLL_INTERVAL 10    /* microseconds */
  40
  41 int iwl_poll_bit(struct iwl_trans *trans, u32 addr,
  42                  u32 bits, u32 mask, int timeout)
  43 {
  44         int t = 0;
  45
  46         do {
  47                 if ((iwl_read32(trans, addr) & mask) == (bits & mask))
  48                         return t;
  49                 udelay(IWL_POLL_INTERVAL);
  50                 t += IWL_POLL_INTERVAL;
  51         } while (t < timeout);
  52
  53         return -ETIMEDOUT;
  54 }
  55 IWL_EXPORT_SYMBOL(iwl_poll_bit);
  56
  57 u32 iwl_read_direct32(struct iwl_trans *trans, u32 reg)
  58 {
  59         u32 value = 0x5a5a5a5a;
  60         unsigned long flags;
  61         if (iwl_trans_grab_nic_access(trans, false, &flags)) {
  62                 value = iwl_read32(trans, reg);
  63                 iwl_trans_release_nic_access(trans, &flags);
  64         }
  65
  66         return value;
  67 }
  68 IWL_EXPORT_SYMBOL(iwl_read_direct32);
  69
  70 void iwl_write_direct32(struct iwl_trans *trans, u32 reg, u32 value)
  71 {
  72         unsigned long flags;
  73
  74         if (iwl_trans_grab_nic_access(trans, false, &flags)) {
  75                 iwl_write32(trans, reg, value);
  76                 iwl_trans_release_nic_access(trans, &flags);
  77         }
  78 }
  79 IWL_EXPORT_SYMBOL(iwl_write_direct32);
  80
  81 int iwl_poll_direct_bit(struct iwl_trans *trans, u32 addr, u32 mask,
  82                         int timeout)
  83 {
  84         int t = 0;
  85
  86         do {
  87                 if ((iwl_read_direct32(trans, addr) & mask) == mask)
  88                         return t;
  89                 udelay(IWL_POLL_INTERVAL);
  90                 t += IWL_POLL_INTERVAL;
  91         } while (t < timeout);
  92
  93         return -ETIMEDOUT;
  94 }
  95 IWL_EXPORT_SYMBOL(iwl_poll_direct_bit);
  96
  97 u32 __iwl_read_prph(struct iwl_trans *trans, u32 ofs)
  98 {
  99         u32 val = iwl_trans_read_prph(trans, ofs);
 100         trace_iwlwifi_dev_ioread_prph32(trans->dev, ofs, val);
 101         return val;
 102 }
 103
 104 void __iwl_write_prph(struct iwl_trans *trans, u32 ofs, u32 val)
 105 {
 106         trace_iwlwifi_dev_iowrite_prph32(trans->dev, ofs, val);
 107         iwl_trans_write_prph(trans, ofs, val);
 108 }
 109
 110 u32 iwl_read_prph(struct iwl_trans *trans, u32 ofs)
 111 {
 112         unsigned long flags;
 113         u32 val = 0x5a5a5a5a;
 114
 115         if (iwl_trans_grab_nic_access(trans, false, &flags)) {
 116                 val = __iwl_read_prph(trans, ofs);
 117                 iwl_trans_release_nic_access(trans, &flags);
 118         }
 119         return val;
 120 }
 121 IWL_EXPORT_SYMBOL(iwl_read_prph);
 122
 123 void iwl_write_prph(struct iwl_trans *trans, u32 ofs, u32 val)
 124 {
 125         unsigned long flags;
 126
 127         if (iwl_trans_grab_nic_access(trans, false, &flags)) {
 128                 __iwl_write_prph(trans, ofs, val);
 129                 iwl_trans_release_nic_access(trans, &flags);
 130         }
 131 }
 132 IWL_EXPORT_SYMBOL(iwl_write_prph);
 133
 134 int iwl_poll_prph_bit(struct iwl_trans *trans, u32 addr,
 135                       u32 bits, u32 mask, int timeout)
 136 {
 137         int t = 0;
 138
 139         do {
 140                 if ((iwl_read_prph(trans, addr) & mask) == (bits & mask))
 141                         return t;
 142                 udelay(IWL_POLL_INTERVAL);
 143                 t += IWL_POLL_INTERVAL;
 144         } while (t < timeout);
 145
 146         return -ETIMEDOUT;
 147 }
 148
 149 void iwl_set_bits_prph(struct iwl_trans *trans, u32 ofs, u32 mask)
 150 {
 151         unsigned long flags;
 152
 153         if (iwl_trans_grab_nic_access(trans, false, &flags)) {
 154                 __iwl_write_prph(trans, ofs,
 155                                  __iwl_read_prph(trans, ofs) | mask);
 156                 iwl_trans_release_nic_access(trans, &flags);
 157         }
 158 }
 159 IWL_EXPORT_SYMBOL(iwl_set_bits_prph);
 160
 161 void iwl_set_bits_mask_prph(struct iwl_trans *trans, u32 ofs,
 162                             u32 bits, u32 mask)
 163 {
 164         unsigned long flags;
 165
 166         if (iwl_trans_grab_nic_access(trans, false, &flags)) {
 167                 __iwl_write_prph(trans, ofs,
 168                                  (__iwl_read_prph(trans, ofs) & mask) | bits);
 169                 iwl_trans_release_nic_access(trans, &flags);
 170         }
 171 }
 172 IWL_EXPORT_SYMBOL(iwl_set_bits_mask_prph);
 173
 174 void iwl_clear_bits_prph(struct iwl_trans *trans, u32 ofs, u32 mask)
 175 {
 176         unsigned long flags;
 177         u32 val;
 178
 179         if (iwl_trans_grab_nic_access(trans, false, &flags)) {
 180                 val = __iwl_read_prph(trans, ofs);
 181                 __iwl_write_prph(trans, ofs, (val & ~mask));
 182                 iwl_trans_release_nic_access(trans, &flags);
 183         }
 184 }
 185 IWL_EXPORT_SYMBOL(iwl_clear_bits_prph);
 186
 187 void iwl_force_nmi(struct iwl_trans *trans)
 188 {
 189         /*
 190          * In HW previous to the 8000 HW family, and in the 8000 HW family
 191          * itself when the revision step==0, the DEVICE_SET_NMI_REG is used
 192          * to force an NMI. Otherwise, a different register -
 193          * DEVICE_SET_NMI_8000B_REG - is used.
 194          */
 195         if ((trans->cfg->device_family != IWL_DEVICE_FAMILY_8000) ||
 196             (CSR_HW_REV_STEP(trans->hw_rev) == SILICON_A_STEP)) {
 197                 iwl_write_prph(trans, DEVICE_SET_NMI_REG,
 198                                DEVICE_SET_NMI_VAL_DRV);
 199                 iwl_write_prph(trans, DEVICE_SET_NMI_REG,
 200                                DEVICE_SET_NMI_VAL_HW);
 201         } else {
 202                 iwl_write_prph(trans, DEVICE_SET_NMI_8000B_REG,
 203                                DEVICE_SET_NMI_8000B_VAL);
 204                 iwl_write_prph(trans, DEVICE_SET_NMI_REG,
 205                                DEVICE_SET_NMI_VAL_DRV);
 206         }
 207 }
 208 IWL_EXPORT_SYMBOL(iwl_force_nmi);
 209
 210 static const char *get_fh_string(int cmd)
 211 {
 212 #define IWL_CMD(x) case x: return #x
 213         switch (cmd) {
 214         IWL_CMD(FH_RSCSR_CHNL0_STTS_WPTR_REG);
 215         IWL_CMD(FH_RSCSR_CHNL0_RBDCB_BASE_REG);
 216         IWL_CMD(FH_RSCSR_CHNL0_WPTR);
 217         IWL_CMD(FH_MEM_RCSR_CHNL0_CONFIG_REG);
 218         IWL_CMD(FH_MEM_RSSR_SHARED_CTRL_REG);
 219         IWL_CMD(FH_MEM_RSSR_RX_STATUS_REG);
 220         IWL_CMD(FH_MEM_RSSR_RX_ENABLE_ERR_IRQ2DRV);
 221         IWL_CMD(FH_TSSR_TX_STATUS_REG);
 222         IWL_CMD(FH_TSSR_TX_ERROR_REG);
 223         default:
 224                 return "UNKNOWN";
 225         }
 226 #undef IWL_CMD
 227 }
 228
 229 int iwl_dump_fh(struct iwl_trans *trans, char **buf)
 230 {
 231         int i;
 232         static const u32 fh_tbl[] = {
 233                 FH_RSCSR_CHNL0_STTS_WPTR_REG,
 234                 FH_RSCSR_CHNL0_RBDCB_BASE_REG,
 235                 FH_RSCSR_CHNL0_WPTR,
 236                 FH_MEM_RCSR_CHNL0_CONFIG_REG,
 237                 FH_MEM_RSSR_SHARED_CTRL_REG,
 238                 FH_MEM_RSSR_RX_STATUS_REG,
 239                 FH_MEM_RSSR_RX_ENABLE_ERR_IRQ2DRV,
 240                 FH_TSSR_TX_STATUS_REG,
 241                 FH_TSSR_TX_ERROR_REG
 242         };
 243
 244 #ifdef CONFIG_IWLWIFI_DEBUGFS
 245         if (buf) {
 246                 int pos = 0;
 247                 size_t bufsz = ARRAY_SIZE(fh_tbl) * 48 + 40;
 248
 249                 *buf = kmalloc(bufsz, GFP_KERNEL);
 250                 if (!*buf)
 251                         return -ENOMEM;
 252
 253                 pos += scnprintf(*buf + pos, bufsz - pos,
 254                                 "FH register values:\n");
 255
 256                 for (i = 0; i < ARRAY_SIZE(fh_tbl); i++)
 257                         pos += scnprintf(*buf + pos, bufsz - pos,
 258                                 "  %34s: 0X%08x\n",
 259                                 get_fh_string(fh_tbl[i]),
 260                                 iwl_read_direct32(trans, fh_tbl[i]));
 261
 262                 return pos;
 263         }
 264 #endif
 265
 266         IWL_ERR(trans, "FH register values:\n");
 267         for (i = 0; i <  ARRAY_SIZE(fh_tbl); i++)
 268                 IWL_ERR(trans, "  %34s: 0X%08x\n",
 269                         get_fh_string(fh_tbl[i]),
 270                         iwl_read_direct32(trans, fh_tbl[i]));
 271
 272         return 0;
 273 }