drivers/net/igb/e1000_mbx.c

   1 /*******************************************************************************
   2
   3   Intel(R) Gigabit Ethernet Linux driver
   4   Copyright(c) 2007-2009 Intel Corporation.
   5
   6   This program is free software; you can redistribute it and/or modify it
   7   under the terms and conditions of the GNU General Public License,
   8   version 2, as published by the Free Software Foundation.
   9
  10   This program is distributed in the hope it will be useful, but WITHOUT
  11   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13   more details.
  14
  15   You should have received a copy of the GNU General Public License along with
  16   this program; if not, write to the Free Software Foundation, Inc.,
  17   51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  18
  19   The full GNU General Public License is included in this distribution in
  20   the file called "COPYING".
  21
  22   Contact Information:
  23   e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
  24   Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  25
  26 *******************************************************************************/
  27
  28 #include "e1000_mbx.h"
  29
  30 /**
  31  *  igb_read_mbx - Reads a message from the mailbox
  32  *  @hw: pointer to the HW structure
  33  *  @msg: The message buffer
  34  *  @size: Length of buffer
  35  *  @mbx_id: id of mailbox to read
  36  *
  37  *  returns SUCCESS if it successfuly read message from buffer
  38  **/
  39 s32 igb_read_mbx(struct e1000_hw *hw, u32 *msg, u16 size, u16 mbx_id)
  40 {
  41         struct e1000_mbx_info *mbx = &hw->mbx;
  42         s32 ret_val = -E1000_ERR_MBX;
  43
  44         /* limit read to size of mailbox */
  45         if (size > mbx->size)
  46                 size = mbx->size;
  47
  48         if (mbx->ops.read)
  49                 ret_val = mbx->ops.read(hw, msg, size, mbx_id);
  50
  51         return ret_val;
  52 }
  53
  54 /**
  55  *  igb_write_mbx - Write a message to the mailbox
  56  *  @hw: pointer to the HW structure
  57  *  @msg: The message buffer
  58  *  @size: Length of buffer
  59  *  @mbx_id: id of mailbox to write
  60  *
  61  *  returns SUCCESS if it successfully copied message into the buffer
  62  **/
  63 s32 igb_write_mbx(struct e1000_hw *hw, u32 *msg, u16 size, u16 mbx_id)
  64 {
  65         struct e1000_mbx_info *mbx = &hw->mbx;
  66         s32 ret_val = 0;
  67
  68         if (size > mbx->size)
  69                 ret_val = -E1000_ERR_MBX;
  70
  71         else if (mbx->ops.write)
  72                 ret_val = mbx->ops.write(hw, msg, size, mbx_id);
  73
  74         return ret_val;
  75 }
  76
  77 /**
  78  *  igb_check_for_msg - checks to see if someone sent us mail
  79  *  @hw: pointer to the HW structure
  80  *  @mbx_id: id of mailbox to check
  81  *
  82  *  returns SUCCESS if the Status bit was found or else ERR_MBX
  83  **/
  84 s32 igb_check_for_msg(struct e1000_hw *hw, u16 mbx_id)
  85 {
  86         struct e1000_mbx_info *mbx = &hw->mbx;
  87         s32 ret_val = -E1000_ERR_MBX;
  88
  89         if (mbx->ops.check_for_msg)
  90                 ret_val = mbx->ops.check_for_msg(hw, mbx_id);
  91
  92         return ret_val;
  93 }
  94
  95 /**
  96  *  igb_check_for_ack - checks to see if someone sent us ACK
  97  *  @hw: pointer to the HW structure
  98  *  @mbx_id: id of mailbox to check
  99  *
 100  *  returns SUCCESS if the Status bit was found or else ERR_MBX
 101  **/
 102 s32 igb_check_for_ack(struct e1000_hw *hw, u16 mbx_id)
 103 {
 104         struct e1000_mbx_info *mbx = &hw->mbx;
 105         s32 ret_val = -E1000_ERR_MBX;
 106
 107         if (mbx->ops.check_for_ack)
 108                 ret_val = mbx->ops.check_for_ack(hw, mbx_id);
 109
 110         return ret_val;
 111 }
 112
 113 /**
 114  *  igb_check_for_rst - checks to see if other side has reset
 115  *  @hw: pointer to the HW structure
 116  *  @mbx_id: id of mailbox to check
 117  *
 118  *  returns SUCCESS if the Status bit was found or else ERR_MBX
 119  **/
 120 s32 igb_check_for_rst(struct e1000_hw *hw, u16 mbx_id)
 121 {
 122         struct e1000_mbx_info *mbx = &hw->mbx;
 123         s32 ret_val = -E1000_ERR_MBX;
 124
 125         if (mbx->ops.check_for_rst)
 126                 ret_val = mbx->ops.check_for_rst(hw, mbx_id);
 127
 128         return ret_val;
 129 }
 130
 131 /**
 132  *  igb_poll_for_msg - Wait for message notification
 133  *  @hw: pointer to the HW structure
 134  *  @mbx_id: id of mailbox to write
 135  *
 136  *  returns SUCCESS if it successfully received a message notification
 137  **/
 138 static s32 igb_poll_for_msg(struct e1000_hw *hw, u16 mbx_id)
 139 {
 140         struct e1000_mbx_info *mbx = &hw->mbx;
 141         int countdown = mbx->timeout;
 142
 143         if (!countdown || !mbx->ops.check_for_msg)
 144                 goto out;
 145
 146         while (mbx->ops.check_for_msg(hw, mbx_id)) {
 147                 countdown--;
 148                 if (!countdown)
 149                         break;
 150                 udelay(mbx->usec_delay);
 151         }
 152 out:
 153         return countdown ? 0 : -E1000_ERR_MBX;
 154 }
 155
 156 /**
 157  *  igb_poll_for_ack - Wait for message acknowledgement
 158  *  @hw: pointer to the HW structure
 159  *  @mbx_id: id of mailbox to write
 160  *
 161  *  returns SUCCESS if it successfully received a message acknowledgement
 162  **/
 163 static s32 igb_poll_for_ack(struct e1000_hw *hw, u16 mbx_id)
 164 {
 165         struct e1000_mbx_info *mbx = &hw->mbx;
 166         int countdown = mbx->timeout;
 167
 168         if (!countdown || !mbx->ops.check_for_ack)
 169                 goto out;
 170
 171         while (mbx->ops.check_for_ack(hw, mbx_id)) {
 172                 countdown--;
 173                 if (!countdown)
 174                         break;
 175                 udelay(mbx->usec_delay);
 176         }
 177 out:
 178         return countdown ? 0 : -E1000_ERR_MBX;
 179 }
 180
 181 /**
 182  *  igb_read_posted_mbx - Wait for message notification and receive message
 183  *  @hw: pointer to the HW structure
 184  *  @msg: The message buffer
 185  *  @size: Length of buffer
 186  *  @mbx_id: id of mailbox to write
 187  *
 188  *  returns SUCCESS if it successfully received a message notification and
 189  *  copied it into the receive buffer.
 190  **/
 191 static s32 igb_read_posted_mbx(struct e1000_hw *hw, u32 *msg, u16 size, u16 mbx_id)
 192 {
 193         struct e1000_mbx_info *mbx = &hw->mbx;
 194         s32 ret_val = -E1000_ERR_MBX;
 195
 196         if (!mbx->ops.read)
 197                 goto out;
 198
 199         ret_val = igb_poll_for_msg(hw, mbx_id);
 200
 201         if (!ret_val)
 202                 ret_val = mbx->ops.read(hw, msg, size, mbx_id);
 203 out:
 204         return ret_val;
 205 }
 206
 207 /**
 208  *  igb_write_posted_mbx - Write a message to the mailbox, wait for ack
 209  *  @hw: pointer to the HW structure
 210  *  @msg: The message buffer
 211  *  @size: Length of buffer
 212  *  @mbx_id: id of mailbox to write
 213  *
 214  *  returns SUCCESS if it successfully copied message into the buffer and
 215  *  received an ack to that message within delay * timeout period
 216  **/
 217 static s32 igb_write_posted_mbx(struct e1000_hw *hw, u32 *msg, u16 size, u16 mbx_id)
 218 {
 219         struct e1000_mbx_info *mbx = &hw->mbx;
 220         s32 ret_val = 0;
 221
 222         if (!mbx->ops.write)
 223                 goto out;
 224
 225         /* send msg*/
 226         ret_val = mbx->ops.write(hw, msg, size, mbx_id);
 227
 228         /* if msg sent wait until we receive an ack */
 229         if (!ret_val)
 230                 ret_val = igb_poll_for_ack(hw, mbx_id);
 231 out:
 232         return ret_val;
 233 }
 234
 235 static s32 igb_check_for_bit_pf(struct e1000_hw *hw, u32 mask)
 236 {
 237         u32 mbvficr = rd32(E1000_MBVFICR);
 238         s32 ret_val = -E1000_ERR_MBX;
 239
 240         if (mbvficr & mask) {
 241                 ret_val = 0;
 242                 wr32(E1000_MBVFICR, mask);
 243         }
 244
 245         return ret_val;
 246 }
 247
 248 /**
 249  *  igb_check_for_msg_pf - checks to see if the VF has sent mail
 250  *  @hw: pointer to the HW structure
 251  *  @vf_number: the VF index
 252  *
 253  *  returns SUCCESS if the VF has set the Status bit or else ERR_MBX
 254  **/
 255 static s32 igb_check_for_msg_pf(struct e1000_hw *hw, u16 vf_number)
 256 {
 257         s32 ret_val = -E1000_ERR_MBX;
 258
 259         if (!igb_check_for_bit_pf(hw, E1000_MBVFICR_VFREQ_VF1 << vf_number)) {
 260                 ret_val = 0;
 261                 hw->mbx.stats.reqs++;
 262         }
 263
 264         return ret_val;
 265 }
 266
 267 /**
 268  *  igb_check_for_ack_pf - checks to see if the VF has ACKed
 269  *  @hw: pointer to the HW structure
 270  *  @vf_number: the VF index
 271  *
 272  *  returns SUCCESS if the VF has set the Status bit or else ERR_MBX
 273  **/
 274 static s32 igb_check_for_ack_pf(struct e1000_hw *hw, u16 vf_number)
 275 {
 276         s32 ret_val = -E1000_ERR_MBX;
 277
 278         if (!igb_check_for_bit_pf(hw, E1000_MBVFICR_VFACK_VF1 << vf_number)) {
 279                 ret_val = 0;
 280                 hw->mbx.stats.acks++;
 281         }
 282
 283         return ret_val;
 284 }
 285
 286 /**
 287  *  igb_check_for_rst_pf - checks to see if the VF has reset
 288  *  @hw: pointer to the HW structure
 289  *  @vf_number: the VF index
 290  *
 291  *  returns SUCCESS if the VF has set the Status bit or else ERR_MBX
 292  **/
 293 static s32 igb_check_for_rst_pf(struct e1000_hw *hw, u16 vf_number)
 294 {
 295         u32 vflre = rd32(E1000_VFLRE);
 296         s32 ret_val = -E1000_ERR_MBX;
 297
 298         if (vflre & (1 << vf_number)) {
 299                 ret_val = 0;
 300                 wr32(E1000_VFLRE, (1 << vf_number));
 301                 hw->mbx.stats.rsts++;
 302         }
 303
 304         return ret_val;
 305 }
 306
 307 /**
 308  *  igb_write_mbx_pf - Places a message in the mailbox
 309  *  @hw: pointer to the HW structure
 310  *  @msg: The message buffer
 311  *  @size: Length of buffer
 312  *  @vf_number: the VF index
 313  *
 314  *  returns SUCCESS if it successfully copied message into the buffer
 315  **/
 316 static s32 igb_write_mbx_pf(struct e1000_hw *hw, u32 *msg, u16 size,
 317                               u16 vf_number)
 318 {
 319         u32 p2v_mailbox;
 320         s32 ret_val = 0;
 321         u16 i;
 322
 323         /* Take ownership of the buffer */
 324         wr32(E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_PFU);
 325
 326         /* Make sure we have ownership now... */
 327         p2v_mailbox = rd32(E1000_P2VMAILBOX(vf_number));
 328         if (!(p2v_mailbox & E1000_P2VMAILBOX_PFU)) {
 329                 /* failed to grab ownership */
 330                 ret_val = -E1000_ERR_MBX;
 331                 goto out_no_write;
 332         }
 333
 334         /*
 335          * flush any ack or msg which may already be in the queue
 336          * as they are likely the result of an error
 337          */
 338         igb_check_for_ack_pf(hw, vf_number);
 339         igb_check_for_msg_pf(hw, vf_number);
 340
 341         /* copy the caller specified message to the mailbox memory buffer */
 342         for (i = 0; i < size; i++)
 343                 array_wr32(E1000_VMBMEM(vf_number), i, msg[i]);
 344
 345         /* Interrupt VF to tell it a message has been sent and release buffer*/
 346         wr32(E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_STS);
 347
 348         /* update stats */
 349         hw->mbx.stats.msgs_tx++;
 350
 351 out_no_write:
 352         return ret_val;
 353
 354 }
 355
 356 /**
 357  *  igb_read_mbx_pf - Read a message from the mailbox
 358  *  @hw: pointer to the HW structure
 359  *  @msg: The message buffer
 360  *  @size: Length of buffer
 361  *  @vf_number: the VF index
 362  *
 363  *  This function copies a message from the mailbox buffer to the caller's
 364  *  memory buffer.  The presumption is that the caller knows that there was
 365  *  a message due to a VF request so no polling for message is needed.
 366  **/
 367 static s32 igb_read_mbx_pf(struct e1000_hw *hw, u32 *msg, u16 size,
 368                              u16 vf_number)
 369 {
 370         u32 p2v_mailbox;
 371         s32 ret_val = 0;
 372         u16 i;
 373
 374         /* Take ownership of the buffer */
 375         wr32(E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_PFU);
 376
 377         /* Make sure we have ownership now... */
 378         p2v_mailbox = rd32(E1000_P2VMAILBOX(vf_number));
 379         if (!(p2v_mailbox & E1000_P2VMAILBOX_PFU)) {
 380                 /* failed to grab ownership */
 381                 ret_val = -E1000_ERR_MBX;
 382                 goto out_no_read;
 383         }
 384
 385         /* copy the message to the mailbox memory buffer */
 386         for (i = 0; i < size; i++)
 387                 msg[i] = array_rd32(E1000_VMBMEM(vf_number), i);
 388
 389         /* Acknowledge the message and release buffer */
 390         wr32(E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_ACK);
 391
 392         /* update stats */
 393         hw->mbx.stats.msgs_rx++;
 394
 395         ret_val = 0;
 396
 397 out_no_read:
 398         return ret_val;
 399 }
 400
 401 /**
 402  *  e1000_init_mbx_params_pf - set initial values for pf mailbox
 403  *  @hw: pointer to the HW structure
 404  *
 405  *  Initializes the hw->mbx struct to correct values for pf mailbox
 406  */
 407 s32 igb_init_mbx_params_pf(struct e1000_hw *hw)
 408 {
 409         struct e1000_mbx_info *mbx = &hw->mbx;
 410
 411         if (hw->mac.type == e1000_82576) {
 412                 mbx->timeout = 0;
 413                 mbx->usec_delay = 0;
 414
 415                 mbx->size = E1000_VFMAILBOX_SIZE;
 416
 417                 mbx->ops.read = igb_read_mbx_pf;
 418                 mbx->ops.write = igb_write_mbx_pf;
 419                 mbx->ops.read_posted = igb_read_posted_mbx;
 420                 mbx->ops.write_posted = igb_write_posted_mbx;
 421                 mbx->ops.check_for_msg = igb_check_for_msg_pf;
 422                 mbx->ops.check_for_ack = igb_check_for_ack_pf;
 423                 mbx->ops.check_for_rst = igb_check_for_rst_pf;
 424
 425                 mbx->stats.msgs_tx = 0;
 426                 mbx->stats.msgs_rx = 0;
 427                 mbx->stats.reqs = 0;
 428                 mbx->stats.acks = 0;
 429                 mbx->stats.rsts = 0;
 430         }
 431
 432         return 0;
 433 }
 434