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 void iwl_write8(struct iwl_trans *trans, u32 ofs, u8 val)
  40 {
  41         trace_iwlwifi_dev_iowrite8(trans->dev, ofs, val);
  42         iwl_trans_write8(trans, ofs, val);
  43 }
  44 IWL_EXPORT_SYMBOL(iwl_write8);
  45
  46 void iwl_write32(struct iwl_trans *trans, u32 ofs, u32 val)
  47 {
  48         trace_iwlwifi_dev_iowrite32(trans->dev, ofs, val);
  49         iwl_trans_write32(trans, ofs, val);
  50 }
  51 IWL_EXPORT_SYMBOL(iwl_write32);
  52
  53 u32 iwl_read32(struct iwl_trans *trans, u32 ofs)
  54 {
  55         u32 val = iwl_trans_read32(trans, ofs);
  56
  57         trace_iwlwifi_dev_ioread32(trans->dev, ofs, val);
  58         return val;
  59 }
  60 IWL_EXPORT_SYMBOL(iwl_read32);
  61
  62 #define IWL_POLL_INTERVAL 10    /* microseconds */
  63
  64 int iwl_poll_bit(struct iwl_trans *trans, u32 addr,
  65                  u32 bits, u32 mask, int timeout)
  66 {
  67         int t = 0;
  68
  69         do {
  70                 if ((iwl_read32(trans, addr) & mask) == (bits & mask))
  71                         return t;
  72                 udelay(IWL_POLL_INTERVAL);
  73                 t += IWL_POLL_INTERVAL;
  74         } while (t < timeout);
  75
  76         return -ETIMEDOUT;
  77 }
  78 IWL_EXPORT_SYMBOL(iwl_poll_bit);
  79
  80 u32 iwl_read_direct32(struct iwl_trans *trans, u32 reg)
  81 {
  82         u32 value = 0x5a5a5a5a;
  83         unsigned long flags;
  84         if (iwl_trans_grab_nic_access(trans, false, &flags)) {
  85                 value = iwl_read32(trans, reg);
  86                 iwl_trans_release_nic_access(trans, &flags);
  87         }
  88
  89         return value;
  90 }
  91 IWL_EXPORT_SYMBOL(iwl_read_direct32);
  92
  93 void iwl_write_direct32(struct iwl_trans *trans, u32 reg, u32 value)
  94 {
  95         unsigned long flags;
  96
  97         if (iwl_trans_grab_nic_access(trans, false, &flags)) {
  98                 iwl_write32(trans, reg, value);
  99                 iwl_trans_release_nic_access(trans, &flags);
 100         }
 101 }
 102 IWL_EXPORT_SYMBOL(iwl_write_direct32);
 103
 104 int iwl_poll_direct_bit(struct iwl_trans *trans, u32 addr, u32 mask,
 105                         int timeout)
 106 {
 107         int t = 0;
 108
 109         do {
 110                 if ((iwl_read_direct32(trans, addr) & mask) == mask)
 111                         return t;
 112                 udelay(IWL_POLL_INTERVAL);
 113                 t += IWL_POLL_INTERVAL;
 114         } while (t < timeout);
 115
 116         return -ETIMEDOUT;
 117 }
 118 IWL_EXPORT_SYMBOL(iwl_poll_direct_bit);
 119
 120 u32 __iwl_read_prph(struct iwl_trans *trans, u32 ofs)
 121 {
 122         u32 val = iwl_trans_read_prph(trans, ofs);
 123         trace_iwlwifi_dev_ioread_prph32(trans->dev, ofs, val);
 124         return val;
 125 }
 126
 127 void __iwl_write_prph(struct iwl_trans *trans, u32 ofs, u32 val)
 128 {
 129         trace_iwlwifi_dev_iowrite_prph32(trans->dev, ofs, val);
 130         iwl_trans_write_prph(trans, ofs, val);
 131 }
 132
 133 u32 iwl_read_prph(struct iwl_trans *trans, u32 ofs)
 134 {
 135         unsigned long flags;
 136         u32 val = 0x5a5a5a5a;
 137
 138         if (iwl_trans_grab_nic_access(trans, false, &flags)) {
 139                 val = __iwl_read_prph(trans, ofs);
 140                 iwl_trans_release_nic_access(trans, &flags);
 141         }
 142         return val;
 143 }
 144 IWL_EXPORT_SYMBOL(iwl_read_prph);
 145
 146 void iwl_write_prph(struct iwl_trans *trans, u32 ofs, u32 val)
 147 {
 148         unsigned long flags;
 149
 150         if (iwl_trans_grab_nic_access(trans, false, &flags)) {
 151                 __iwl_write_prph(trans, ofs, val);
 152                 iwl_trans_release_nic_access(trans, &flags);
 153         }
 154 }
 155 IWL_EXPORT_SYMBOL(iwl_write_prph);
 156
 157 int iwl_poll_prph_bit(struct iwl_trans *trans, u32 addr,
 158                       u32 bits, u32 mask, int timeout)
 159 {
 160         int t = 0;
 161
 162         do {
 163                 if ((iwl_read_prph(trans, addr) & mask) == (bits & mask))
 164                         return t;
 165                 udelay(IWL_POLL_INTERVAL);
 166                 t += IWL_POLL_INTERVAL;
 167         } while (t < timeout);
 168
 169         return -ETIMEDOUT;
 170 }
 171
 172 void iwl_set_bits_prph(struct iwl_trans *trans, u32 ofs, u32 mask)
 173 {
 174         unsigned long flags;
 175
 176         if (iwl_trans_grab_nic_access(trans, false, &flags)) {
 177                 __iwl_write_prph(trans, ofs,
 178                                  __iwl_read_prph(trans, ofs) | mask);
 179                 iwl_trans_release_nic_access(trans, &flags);
 180         }
 181 }
 182 IWL_EXPORT_SYMBOL(iwl_set_bits_prph);
 183
 184 void iwl_set_bits_mask_prph(struct iwl_trans *trans, u32 ofs,
 185                             u32 bits, u32 mask)
 186 {
 187         unsigned long flags;
 188
 189         if (iwl_trans_grab_nic_access(trans, false, &flags)) {
 190                 __iwl_write_prph(trans, ofs,
 191                                  (__iwl_read_prph(trans, ofs) & mask) | bits);
 192                 iwl_trans_release_nic_access(trans, &flags);
 193         }
 194 }
 195 IWL_EXPORT_SYMBOL(iwl_set_bits_mask_prph);
 196
 197 void iwl_clear_bits_prph(struct iwl_trans *trans, u32 ofs, u32 mask)
 198 {
 199         unsigned long flags;
 200         u32 val;
 201
 202         if (iwl_trans_grab_nic_access(trans, false, &flags)) {
 203                 val = __iwl_read_prph(trans, ofs);
 204                 __iwl_write_prph(trans, ofs, (val & ~mask));
 205                 iwl_trans_release_nic_access(trans, &flags);
 206         }
 207 }
 208 IWL_EXPORT_SYMBOL(iwl_clear_bits_prph);
 209
 210 void iwl_force_nmi(struct iwl_trans *trans)
 211 {
 212         if (trans->cfg->device_family != IWL_DEVICE_FAMILY_8000) {
 213                 iwl_write_prph(trans, DEVICE_SET_NMI_REG,
 214                                DEVICE_SET_NMI_VAL_DRV);
 215                 iwl_write_prph(trans, DEVICE_SET_NMI_REG,
 216                                DEVICE_SET_NMI_VAL_HW);
 217         } else {
 218                 iwl_write_prph(trans, DEVICE_SET_NMI_8000_REG,
 219                                DEVICE_SET_NMI_8000_VAL);
 220                 iwl_write_prph(trans, DEVICE_SET_NMI_REG,
 221                                DEVICE_SET_NMI_VAL_DRV);
 222         }
 223 }
 224 IWL_EXPORT_SYMBOL(iwl_force_nmi);
 225
 226 static const char *get_fh_string(int cmd)
 227 {
 228 #define IWL_CMD(x) case x: return #x
 229         switch (cmd) {
 230         IWL_CMD(FH_RSCSR_CHNL0_STTS_WPTR_REG);
 231         IWL_CMD(FH_RSCSR_CHNL0_RBDCB_BASE_REG);
 232         IWL_CMD(FH_RSCSR_CHNL0_WPTR);
 233         IWL_CMD(FH_MEM_RCSR_CHNL0_CONFIG_REG);
 234         IWL_CMD(FH_MEM_RSSR_SHARED_CTRL_REG);
 235         IWL_CMD(FH_MEM_RSSR_RX_STATUS_REG);
 236         IWL_CMD(FH_MEM_RSSR_RX_ENABLE_ERR_IRQ2DRV);
 237         IWL_CMD(FH_TSSR_TX_STATUS_REG);
 238         IWL_CMD(FH_TSSR_TX_ERROR_REG);
 239         default:
 240                 return "UNKNOWN";
 241         }
 242 #undef IWL_CMD
 243 }
 244
 245 int iwl_dump_fh(struct iwl_trans *trans, char **buf)
 246 {
 247         int i;
 248         static const u32 fh_tbl[] = {
 249                 FH_RSCSR_CHNL0_STTS_WPTR_REG,
 250                 FH_RSCSR_CHNL0_RBDCB_BASE_REG,
 251                 FH_RSCSR_CHNL0_WPTR,
 252                 FH_MEM_RCSR_CHNL0_CONFIG_REG,
 253                 FH_MEM_RSSR_SHARED_CTRL_REG,
 254                 FH_MEM_RSSR_RX_STATUS_REG,
 255                 FH_MEM_RSSR_RX_ENABLE_ERR_IRQ2DRV,
 256                 FH_TSSR_TX_STATUS_REG,
 257                 FH_TSSR_TX_ERROR_REG
 258         };
 259
 260 #ifdef CONFIG_IWLWIFI_DEBUGFS
 261         if (buf) {
 262                 int pos = 0;
 263                 size_t bufsz = ARRAY_SIZE(fh_tbl) * 48 + 40;
 264
 265                 *buf = kmalloc(bufsz, GFP_KERNEL);
 266                 if (!*buf)
 267                         return -ENOMEM;
 268
 269                 pos += scnprintf(*buf + pos, bufsz - pos,
 270                                 "FH register values:\n");
 271
 272                 for (i = 0; i < ARRAY_SIZE(fh_tbl); i++)
 273                         pos += scnprintf(*buf + pos, bufsz - pos,
 274                                 "  %34s: 0X%08x\n",
 275                                 get_fh_string(fh_tbl[i]),
 276                                 iwl_read_direct32(trans, fh_tbl[i]));
 277
 278                 return pos;
 279         }
 280 #endif
 281
 282         IWL_ERR(trans, "FH register values:\n");
 283         for (i = 0; i <  ARRAY_SIZE(fh_tbl); i++)
 284                 IWL_ERR(trans, "  %34s: 0X%08x\n",
 285                         get_fh_string(fh_tbl[i]),
 286                         iwl_read_direct32(trans, fh_tbl[i]));
 287
 288         return 0;
 289 }