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

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2003 - 2014 Intel Corporation. All rights reserved.
   4  * Copyright(c) 2015 Intel Deutschland GmbH
   5  *
   6  * Portions of this file are derived from the ipw3945 project.
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of version 2 of the GNU General Public License as
  10  * published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but WITHOUT
  13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  15  * more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along with
  18  * this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  20  *
  21  * The full GNU General Public License is included in this distribution in the
  22  * file called LICENSE.
  23  *
  24  * Contact Information:
  25  *  Intel Linux Wireless <linuxwifi@intel.com>
  26  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  27  *
  28  *****************************************************************************/
  29 #include <linux/delay.h>
  30 #include <linux/device.h>
  31 #include <linux/export.h>
  32
  33 #include "iwl-drv.h"
  34 #include "iwl-io.h"
  35 #include "iwl-csr.h"
  36 #include "iwl-debug.h"
  37 #include "iwl-prph.h"
  38 #include "iwl-fh.h"
  39
  40 void iwl_write8(struct iwl_trans *trans, u32 ofs, u8 val)
  41 {
  42         trace_iwlwifi_dev_iowrite8(trans->dev, ofs, val);
  43         iwl_trans_write8(trans, ofs, val);
  44 }
  45 IWL_EXPORT_SYMBOL(iwl_write8);
  46
  47 void iwl_write32(struct iwl_trans *trans, u32 ofs, u32 val)
  48 {
  49         trace_iwlwifi_dev_iowrite32(trans->dev, ofs, val);
  50         iwl_trans_write32(trans, ofs, val);
  51 }
  52 IWL_EXPORT_SYMBOL(iwl_write32);
  53
  54 u32 iwl_read32(struct iwl_trans *trans, u32 ofs)
  55 {
  56         u32 val = iwl_trans_read32(trans, ofs);
  57
  58         trace_iwlwifi_dev_ioread32(trans->dev, ofs, val);
  59         return val;
  60 }
  61 IWL_EXPORT_SYMBOL(iwl_read32);
  62
  63 #define IWL_POLL_INTERVAL 10    /* microseconds */
  64
  65 int iwl_poll_bit(struct iwl_trans *trans, u32 addr,
  66                  u32 bits, u32 mask, int timeout)
  67 {
  68         int t = 0;
  69
  70         do {
  71                 if ((iwl_read32(trans, addr) & mask) == (bits & mask))
  72                         return t;
  73                 udelay(IWL_POLL_INTERVAL);
  74                 t += IWL_POLL_INTERVAL;
  75         } while (t < timeout);
  76
  77         return -ETIMEDOUT;
  78 }
  79 IWL_EXPORT_SYMBOL(iwl_poll_bit);
  80
  81 u32 iwl_read_direct32(struct iwl_trans *trans, u32 reg)
  82 {
  83         u32 value = 0x5a5a5a5a;
  84         unsigned long flags;
  85         if (iwl_trans_grab_nic_access(trans, &flags)) {
  86                 value = iwl_read32(trans, reg);
  87                 iwl_trans_release_nic_access(trans, &flags);
  88         }
  89
  90         return value;
  91 }
  92 IWL_EXPORT_SYMBOL(iwl_read_direct32);
  93
  94 void iwl_write_direct32(struct iwl_trans *trans, u32 reg, u32 value)
  95 {
  96         unsigned long flags;
  97
  98         if (iwl_trans_grab_nic_access(trans, &flags)) {
  99                 iwl_write32(trans, reg, value);
 100                 iwl_trans_release_nic_access(trans, &flags);
 101         }
 102 }
 103 IWL_EXPORT_SYMBOL(iwl_write_direct32);
 104
 105 int iwl_poll_direct_bit(struct iwl_trans *trans, u32 addr, u32 mask,
 106                         int timeout)
 107 {
 108         int t = 0;
 109
 110         do {
 111                 if ((iwl_read_direct32(trans, addr) & mask) == mask)
 112                         return t;
 113                 udelay(IWL_POLL_INTERVAL);
 114                 t += IWL_POLL_INTERVAL;
 115         } while (t < timeout);
 116
 117         return -ETIMEDOUT;
 118 }
 119 IWL_EXPORT_SYMBOL(iwl_poll_direct_bit);
 120
 121 u32 iwl_read_prph_no_grab(struct iwl_trans *trans, u32 ofs)
 122 {
 123         u32 val = iwl_trans_read_prph(trans, ofs);
 124         trace_iwlwifi_dev_ioread_prph32(trans->dev, ofs, val);
 125         return val;
 126 }
 127 IWL_EXPORT_SYMBOL(iwl_read_prph_no_grab);
 128
 129 void iwl_write_prph_no_grab(struct iwl_trans *trans, u32 ofs, u32 val)
 130 {
 131         trace_iwlwifi_dev_iowrite_prph32(trans->dev, ofs, val);
 132         iwl_trans_write_prph(trans, ofs, val);
 133 }
 134 IWL_EXPORT_SYMBOL(iwl_write_prph_no_grab);
 135
 136 u32 iwl_read_prph(struct iwl_trans *trans, u32 ofs)
 137 {
 138         unsigned long flags;
 139         u32 val = 0x5a5a5a5a;
 140
 141         if (iwl_trans_grab_nic_access(trans, &flags)) {
 142                 val = iwl_read_prph_no_grab(trans, ofs);
 143                 iwl_trans_release_nic_access(trans, &flags);
 144         }
 145         return val;
 146 }
 147 IWL_EXPORT_SYMBOL(iwl_read_prph);
 148
 149 void iwl_write_prph(struct iwl_trans *trans, u32 ofs, u32 val)
 150 {
 151         unsigned long flags;
 152
 153         if (iwl_trans_grab_nic_access(trans, &flags)) {
 154                 iwl_write_prph_no_grab(trans, ofs, val);
 155                 iwl_trans_release_nic_access(trans, &flags);
 156         }
 157 }
 158 IWL_EXPORT_SYMBOL(iwl_write_prph);
 159
 160 int iwl_poll_prph_bit(struct iwl_trans *trans, u32 addr,
 161                       u32 bits, u32 mask, int timeout)
 162 {
 163         int t = 0;
 164
 165         do {
 166                 if ((iwl_read_prph(trans, addr) & mask) == (bits & mask))
 167                         return t;
 168                 udelay(IWL_POLL_INTERVAL);
 169                 t += IWL_POLL_INTERVAL;
 170         } while (t < timeout);
 171
 172         return -ETIMEDOUT;
 173 }
 174
 175 void iwl_set_bits_prph(struct iwl_trans *trans, u32 ofs, u32 mask)
 176 {
 177         unsigned long flags;
 178
 179         if (iwl_trans_grab_nic_access(trans, &flags)) {
 180                 iwl_write_prph_no_grab(trans, ofs,
 181                                        iwl_read_prph_no_grab(trans, ofs) |
 182                                        mask);
 183                 iwl_trans_release_nic_access(trans, &flags);
 184         }
 185 }
 186 IWL_EXPORT_SYMBOL(iwl_set_bits_prph);
 187
 188 void iwl_set_bits_mask_prph(struct iwl_trans *trans, u32 ofs,
 189                             u32 bits, u32 mask)
 190 {
 191         unsigned long flags;
 192
 193         if (iwl_trans_grab_nic_access(trans, &flags)) {
 194                 iwl_write_prph_no_grab(trans, ofs,
 195                                        (iwl_read_prph_no_grab(trans, ofs) &
 196                                         mask) | bits);
 197                 iwl_trans_release_nic_access(trans, &flags);
 198         }
 199 }
 200 IWL_EXPORT_SYMBOL(iwl_set_bits_mask_prph);
 201
 202 void iwl_clear_bits_prph(struct iwl_trans *trans, u32 ofs, u32 mask)
 203 {
 204         unsigned long flags;
 205         u32 val;
 206
 207         if (iwl_trans_grab_nic_access(trans, &flags)) {
 208                 val = iwl_read_prph_no_grab(trans, ofs);
 209                 iwl_write_prph_no_grab(trans, ofs, (val & ~mask));
 210                 iwl_trans_release_nic_access(trans, &flags);
 211         }
 212 }
 213 IWL_EXPORT_SYMBOL(iwl_clear_bits_prph);
 214
 215 void iwl_force_nmi(struct iwl_trans *trans)
 216 {
 217         if (trans->cfg->device_family != IWL_DEVICE_FAMILY_8000) {
 218                 iwl_write_prph(trans, DEVICE_SET_NMI_REG,
 219                                DEVICE_SET_NMI_VAL_DRV);
 220                 iwl_write_prph(trans, DEVICE_SET_NMI_REG,
 221                                DEVICE_SET_NMI_VAL_HW);
 222         } else {
 223                 iwl_write_prph(trans, DEVICE_SET_NMI_8000_REG,
 224                                DEVICE_SET_NMI_8000_VAL);
 225                 iwl_write_prph(trans, DEVICE_SET_NMI_REG,
 226                                DEVICE_SET_NMI_VAL_DRV);
 227         }
 228 }
 229 IWL_EXPORT_SYMBOL(iwl_force_nmi);
 230
 231 static const char *get_fh_string(int cmd)
 232 {
 233 #define IWL_CMD(x) case x: return #x
 234         switch (cmd) {
 235         IWL_CMD(FH_RSCSR_CHNL0_STTS_WPTR_REG);
 236         IWL_CMD(FH_RSCSR_CHNL0_RBDCB_BASE_REG);
 237         IWL_CMD(FH_RSCSR_CHNL0_WPTR);
 238         IWL_CMD(FH_MEM_RCSR_CHNL0_CONFIG_REG);
 239         IWL_CMD(FH_MEM_RSSR_SHARED_CTRL_REG);
 240         IWL_CMD(FH_MEM_RSSR_RX_STATUS_REG);
 241         IWL_CMD(FH_MEM_RSSR_RX_ENABLE_ERR_IRQ2DRV);
 242         IWL_CMD(FH_TSSR_TX_STATUS_REG);
 243         IWL_CMD(FH_TSSR_TX_ERROR_REG);
 244         default:
 245                 return "UNKNOWN";
 246         }
 247 #undef IWL_CMD
 248 }
 249
 250 int iwl_dump_fh(struct iwl_trans *trans, char **buf)
 251 {
 252         int i;
 253         static const u32 fh_tbl[] = {
 254                 FH_RSCSR_CHNL0_STTS_WPTR_REG,
 255                 FH_RSCSR_CHNL0_RBDCB_BASE_REG,
 256                 FH_RSCSR_CHNL0_WPTR,
 257                 FH_MEM_RCSR_CHNL0_CONFIG_REG,
 258                 FH_MEM_RSSR_SHARED_CTRL_REG,
 259                 FH_MEM_RSSR_RX_STATUS_REG,
 260                 FH_MEM_RSSR_RX_ENABLE_ERR_IRQ2DRV,
 261                 FH_TSSR_TX_STATUS_REG,
 262                 FH_TSSR_TX_ERROR_REG
 263         };
 264
 265 #ifdef CONFIG_IWLWIFI_DEBUGFS
 266         if (buf) {
 267                 int pos = 0;
 268                 size_t bufsz = ARRAY_SIZE(fh_tbl) * 48 + 40;
 269
 270                 *buf = kmalloc(bufsz, GFP_KERNEL);
 271                 if (!*buf)
 272                         return -ENOMEM;
 273
 274                 pos += scnprintf(*buf + pos, bufsz - pos,
 275                                 "FH register values:\n");
 276
 277                 for (i = 0; i < ARRAY_SIZE(fh_tbl); i++)
 278                         pos += scnprintf(*buf + pos, bufsz - pos,
 279                                 "  %34s: 0X%08x\n",
 280                                 get_fh_string(fh_tbl[i]),
 281                                 iwl_read_direct32(trans, fh_tbl[i]));
 282
 283                 return pos;
 284         }
 285 #endif
 286
 287         IWL_ERR(trans, "FH register values:\n");
 288         for (i = 0; i <  ARRAY_SIZE(fh_tbl); i++)
 289                 IWL_ERR(trans, "  %34s: 0X%08x\n",
 290                         get_fh_string(fh_tbl[i]),
 291                         iwl_read_direct32(trans, fh_tbl[i]));
 292
 293         return 0;
 294 }