drivers/staging/octeon/cvmx-helper-util.c

   1 /***********************license start***************
   2  * Author: Cavium Networks
   3  *
   4  * Contact: support@caviumnetworks.com
   5  * This file is part of the OCTEON SDK
   6  *
   7  * Copyright (c) 2003-2008 Cavium Networks
   8  *
   9  * This file is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License, Version 2, as
  11  * published by the Free Software Foundation.
  12  *
  13  * This file is distributed in the hope that it will be useful, but
  14  * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
  15  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
  16  * NONINFRINGEMENT.  See the GNU General Public License for more
  17  * details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this file; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  22  * or visit http://www.gnu.org/licenses/.
  23  *
  24  * This file may also be available under a different license from Cavium.
  25  * Contact Cavium Networks for more information
  26  ***********************license end**************************************/
  27
  28 /*
  29  * Small helper utilities.
  30  */
  31 #include <linux/kernel.h>
  32
  33 #include <asm/octeon/octeon.h>
  34
  35 #include "cvmx-config.h"
  36
  37 #include "cvmx-fpa.h"
  38 #include "cvmx-pip.h"
  39 #include "cvmx-pko.h"
  40 #include "cvmx-ipd.h"
  41 #include "cvmx-spi.h"
  42
  43 #include "cvmx-helper.h"
  44 #include "cvmx-helper-util.h"
  45
  46 #include <asm/octeon/cvmx-ipd-defs.h>
  47
  48 /**
  49  * Convert a interface mode into a human readable string
  50  *
  51  * @mode:   Mode to convert
  52  *
  53  * Returns String
  54  */
  55 const char *cvmx_helper_interface_mode_to_string(cvmx_helper_interface_mode_t
  56                                                  mode)
  57 {
  58         switch (mode) {
  59         case CVMX_HELPER_INTERFACE_MODE_DISABLED:
  60                 return "DISABLED";
  61         case CVMX_HELPER_INTERFACE_MODE_RGMII:
  62                 return "RGMII";
  63         case CVMX_HELPER_INTERFACE_MODE_GMII:
  64                 return "GMII";
  65         case CVMX_HELPER_INTERFACE_MODE_SPI:
  66                 return "SPI";
  67         case CVMX_HELPER_INTERFACE_MODE_PCIE:
  68                 return "PCIE";
  69         case CVMX_HELPER_INTERFACE_MODE_XAUI:
  70                 return "XAUI";
  71         case CVMX_HELPER_INTERFACE_MODE_SGMII:
  72                 return "SGMII";
  73         case CVMX_HELPER_INTERFACE_MODE_PICMG:
  74                 return "PICMG";
  75         case CVMX_HELPER_INTERFACE_MODE_NPI:
  76                 return "NPI";
  77         case CVMX_HELPER_INTERFACE_MODE_LOOP:
  78                 return "LOOP";
  79         }
  80         return "UNKNOWN";
  81 }
  82
  83 /**
  84  * Debug routine to dump the packet structure to the console
  85  *
  86  * @work:   Work queue entry containing the packet to dump
  87  * Returns
  88  */
  89 int cvmx_helper_dump_packet(cvmx_wqe_t *work)
  90 {
  91         uint64_t count;
  92         uint64_t remaining_bytes;
  93         union cvmx_buf_ptr buffer_ptr;
  94         uint64_t start_of_buffer;
  95         uint8_t *data_address;
  96         uint8_t *end_of_data;
  97
  98         cvmx_dprintf("Packet Length:   %u\n", work->len);
  99         cvmx_dprintf("    Input Port:  %u\n", work->ipprt);
 100         cvmx_dprintf("    QoS:         %u\n", work->qos);
 101         cvmx_dprintf("    Buffers:     %u\n", work->word2.s.bufs);
 102
 103         if (work->word2.s.bufs == 0) {
 104                 union cvmx_ipd_wqe_fpa_queue wqe_pool;
 105                 wqe_pool.u64 = cvmx_read_csr(CVMX_IPD_WQE_FPA_QUEUE);
 106                 buffer_ptr.u64 = 0;
 107                 buffer_ptr.s.pool = wqe_pool.s.wqe_pool;
 108                 buffer_ptr.s.size = 128;
 109                 buffer_ptr.s.addr = cvmx_ptr_to_phys(work->packet_data);
 110                 if (likely(!work->word2.s.not_IP)) {
 111                         union cvmx_pip_ip_offset pip_ip_offset;
 112                         pip_ip_offset.u64 = cvmx_read_csr(CVMX_PIP_IP_OFFSET);
 113                         buffer_ptr.s.addr +=
 114                             (pip_ip_offset.s.offset << 3) -
 115                             work->word2.s.ip_offset;
 116                         buffer_ptr.s.addr += (work->word2.s.is_v6 ^ 1) << 2;
 117                 } else {
 118                         /*
 119                          * WARNING: This code assumes that the packet
 120                          * is not RAW. If it was, we would use
 121                          * PIP_GBL_CFG[RAW_SHF] instead of
 122                          * PIP_GBL_CFG[NIP_SHF].
 123                          */
 124                         union cvmx_pip_gbl_cfg pip_gbl_cfg;
 125                         pip_gbl_cfg.u64 = cvmx_read_csr(CVMX_PIP_GBL_CFG);
 126                         buffer_ptr.s.addr += pip_gbl_cfg.s.nip_shf;
 127                 }
 128         } else
 129                 buffer_ptr = work->packet_ptr;
 130         remaining_bytes = work->len;
 131
 132         while (remaining_bytes) {
 133                 start_of_buffer =
 134                     ((buffer_ptr.s.addr >> 7) - buffer_ptr.s.back) << 7;
 135                 cvmx_dprintf("    Buffer Start:%llx\n",
 136                              (unsigned long long)start_of_buffer);
 137                 cvmx_dprintf("    Buffer I   : %u\n", buffer_ptr.s.i);
 138                 cvmx_dprintf("    Buffer Back: %u\n", buffer_ptr.s.back);
 139                 cvmx_dprintf("    Buffer Pool: %u\n", buffer_ptr.s.pool);
 140                 cvmx_dprintf("    Buffer Data: %llx\n",
 141                              (unsigned long long)buffer_ptr.s.addr);
 142                 cvmx_dprintf("    Buffer Size: %u\n", buffer_ptr.s.size);
 143
 144                 cvmx_dprintf("\t\t");
 145                 data_address = (uint8_t *) cvmx_phys_to_ptr(buffer_ptr.s.addr);
 146                 end_of_data = data_address + buffer_ptr.s.size;
 147                 count = 0;
 148                 while (data_address < end_of_data) {
 149                         if (remaining_bytes == 0)
 150                                 break;
 151                         else
 152                                 remaining_bytes--;
 153                         cvmx_dprintf("%02x", (unsigned int)*data_address);
 154                         data_address++;
 155                         if (remaining_bytes && (count == 7)) {
 156                                 cvmx_dprintf("\n\t\t");
 157                                 count = 0;
 158                         } else
 159                                 count++;
 160                 }
 161                 cvmx_dprintf("\n");
 162
 163                 if (remaining_bytes)
 164                         buffer_ptr = *(union cvmx_buf_ptr *)
 165                                 cvmx_phys_to_ptr(buffer_ptr.s.addr - 8);
 166         }
 167         return 0;
 168 }
 169
 170 /**
 171  * Setup Random Early Drop on a specific input queue
 172  *
 173  * @queue:  Input queue to setup RED on (0-7)
 174  * @pass_thresh:
 175  *               Packets will begin slowly dropping when there are less than
 176  *               this many packet buffers free in FPA 0.
 177  * @drop_thresh:
 178  *               All incomming packets will be dropped when there are less
 179  *               than this many free packet buffers in FPA 0.
 180  * Returns Zero on success. Negative on failure
 181  */
 182 int cvmx_helper_setup_red_queue(int queue, int pass_thresh, int drop_thresh)
 183 {
 184         union cvmx_ipd_qosx_red_marks red_marks;
 185         union cvmx_ipd_red_quex_param red_param;
 186
 187         /* Set RED to begin dropping packets when there are pass_thresh buffers
 188            left. It will linearly drop more packets until reaching drop_thresh
 189            buffers */
 190         red_marks.u64 = 0;
 191         red_marks.s.drop = drop_thresh;
 192         red_marks.s.pass = pass_thresh;
 193         cvmx_write_csr(CVMX_IPD_QOSX_RED_MARKS(queue), red_marks.u64);
 194
 195         /* Use the actual queue 0 counter, not the average */
 196         red_param.u64 = 0;
 197         red_param.s.prb_con =
 198             (255ul << 24) / (red_marks.s.pass - red_marks.s.drop);
 199         red_param.s.avg_con = 1;
 200         red_param.s.new_con = 255;
 201         red_param.s.use_pcnt = 1;
 202         cvmx_write_csr(CVMX_IPD_RED_QUEX_PARAM(queue), red_param.u64);
 203         return 0;
 204 }
 205
 206 /**
 207  * Setup Random Early Drop to automatically begin dropping packets.
 208  *
 209  * @pass_thresh:
 210  *               Packets will begin slowly dropping when there are less than
 211  *               this many packet buffers free in FPA 0.
 212  * @drop_thresh:
 213  *               All incomming packets will be dropped when there are less
 214  *               than this many free packet buffers in FPA 0.
 215  * Returns Zero on success. Negative on failure
 216  */
 217 int cvmx_helper_setup_red(int pass_thresh, int drop_thresh)
 218 {
 219         union cvmx_ipd_portx_bp_page_cnt page_cnt;
 220         union cvmx_ipd_bp_prt_red_end ipd_bp_prt_red_end;
 221         union cvmx_ipd_red_port_enable red_port_enable;
 222         int queue;
 223         int interface;
 224         int port;
 225
 226         /* Disable backpressure based on queued buffers. It needs SW support */
 227         page_cnt.u64 = 0;
 228         page_cnt.s.bp_enb = 0;
 229         page_cnt.s.page_cnt = 100;
 230         for (interface = 0; interface < 2; interface++) {
 231                 for (port = cvmx_helper_get_first_ipd_port(interface);
 232                      port < cvmx_helper_get_last_ipd_port(interface); port++)
 233                         cvmx_write_csr(CVMX_IPD_PORTX_BP_PAGE_CNT(port),
 234                                        page_cnt.u64);
 235         }
 236
 237         for (queue = 0; queue < 8; queue++)
 238                 cvmx_helper_setup_red_queue(queue, pass_thresh, drop_thresh);
 239
 240         /* Shutoff the dropping based on the per port page count. SW isn't
 241            decrementing it right now */
 242         ipd_bp_prt_red_end.u64 = 0;
 243         ipd_bp_prt_red_end.s.prt_enb = 0;
 244         cvmx_write_csr(CVMX_IPD_BP_PRT_RED_END, ipd_bp_prt_red_end.u64);
 245
 246         red_port_enable.u64 = 0;
 247         red_port_enable.s.prt_enb = 0xfffffffffull;
 248         red_port_enable.s.avg_dly = 10000;
 249         red_port_enable.s.prb_dly = 10000;
 250         cvmx_write_csr(CVMX_IPD_RED_PORT_ENABLE, red_port_enable.u64);
 251
 252         return 0;
 253 }
 254
 255 /**
 256  * Setup the common GMX settings that determine the number of
 257  * ports. These setting apply to almost all configurations of all
 258  * chips.
 259  *
 260  * @interface: Interface to configure
 261  * @num_ports: Number of ports on the interface
 262  *
 263  * Returns Zero on success, negative on failure
 264  */
 265 int __cvmx_helper_setup_gmx(int interface, int num_ports)
 266 {
 267         union cvmx_gmxx_tx_prts gmx_tx_prts;
 268         union cvmx_gmxx_rx_prts gmx_rx_prts;
 269         union cvmx_pko_reg_gmx_port_mode pko_mode;
 270         union cvmx_gmxx_txx_thresh gmx_tx_thresh;
 271         int index;
 272
 273         /* Tell GMX the number of TX ports on this interface */
 274         gmx_tx_prts.u64 = cvmx_read_csr(CVMX_GMXX_TX_PRTS(interface));
 275         gmx_tx_prts.s.prts = num_ports;
 276         cvmx_write_csr(CVMX_GMXX_TX_PRTS(interface), gmx_tx_prts.u64);
 277
 278         /* Tell GMX the number of RX ports on this interface.  This only
 279          ** applies to *GMII and XAUI ports */
 280         if (cvmx_helper_interface_get_mode(interface) ==
 281             CVMX_HELPER_INTERFACE_MODE_RGMII
 282             || cvmx_helper_interface_get_mode(interface) ==
 283             CVMX_HELPER_INTERFACE_MODE_SGMII
 284             || cvmx_helper_interface_get_mode(interface) ==
 285             CVMX_HELPER_INTERFACE_MODE_GMII
 286             || cvmx_helper_interface_get_mode(interface) ==
 287             CVMX_HELPER_INTERFACE_MODE_XAUI) {
 288                 if (num_ports > 4) {
 289                         cvmx_dprintf("__cvmx_helper_setup_gmx: Illegal "
 290                                      "num_ports\n");
 291                         return -1;
 292                 }
 293
 294                 gmx_rx_prts.u64 = cvmx_read_csr(CVMX_GMXX_RX_PRTS(interface));
 295                 gmx_rx_prts.s.prts = num_ports;
 296                 cvmx_write_csr(CVMX_GMXX_RX_PRTS(interface), gmx_rx_prts.u64);
 297         }
 298
 299         /* Skip setting CVMX_PKO_REG_GMX_PORT_MODE on 30XX, 31XX, and 50XX */
 300         if (!OCTEON_IS_MODEL(OCTEON_CN30XX) && !OCTEON_IS_MODEL(OCTEON_CN31XX)
 301             && !OCTEON_IS_MODEL(OCTEON_CN50XX)) {
 302                 /* Tell PKO the number of ports on this interface */
 303                 pko_mode.u64 = cvmx_read_csr(CVMX_PKO_REG_GMX_PORT_MODE);
 304                 if (interface == 0) {
 305                         if (num_ports == 1)
 306                                 pko_mode.s.mode0 = 4;
 307                         else if (num_ports == 2)
 308                                 pko_mode.s.mode0 = 3;
 309                         else if (num_ports <= 4)
 310                                 pko_mode.s.mode0 = 2;
 311                         else if (num_ports <= 8)
 312                                 pko_mode.s.mode0 = 1;
 313                         else
 314                                 pko_mode.s.mode0 = 0;
 315                 } else {
 316                         if (num_ports == 1)
 317                                 pko_mode.s.mode1 = 4;
 318                         else if (num_ports == 2)
 319                                 pko_mode.s.mode1 = 3;
 320                         else if (num_ports <= 4)
 321                                 pko_mode.s.mode1 = 2;
 322                         else if (num_ports <= 8)
 323                                 pko_mode.s.mode1 = 1;
 324                         else
 325                                 pko_mode.s.mode1 = 0;
 326                 }
 327                 cvmx_write_csr(CVMX_PKO_REG_GMX_PORT_MODE, pko_mode.u64);
 328         }
 329
 330         /*
 331          * Set GMX to buffer as much data as possible before starting
 332          * transmit.  This reduces the chances that we have a TX under
 333          * run due to memory contention. Any packet that fits entirely
 334          * in the GMX FIFO can never have an under run regardless of
 335          * memory load.
 336          */
 337         gmx_tx_thresh.u64 = cvmx_read_csr(CVMX_GMXX_TXX_THRESH(0, interface));
 338         if (OCTEON_IS_MODEL(OCTEON_CN30XX) || OCTEON_IS_MODEL(OCTEON_CN31XX)
 339             || OCTEON_IS_MODEL(OCTEON_CN50XX)) {
 340                 /* These chips have a fixed max threshold of 0x40 */
 341                 gmx_tx_thresh.s.cnt = 0x40;
 342         } else {
 343                 /* Choose the max value for the number of ports */
 344                 if (num_ports <= 1)
 345                         gmx_tx_thresh.s.cnt = 0x100 / 1;
 346                 else if (num_ports == 2)
 347                         gmx_tx_thresh.s.cnt = 0x100 / 2;
 348                 else
 349                         gmx_tx_thresh.s.cnt = 0x100 / 4;
 350         }
 351         /*
 352          * SPI and XAUI can have lots of ports but the GMX hardware
 353          * only ever has a max of 4.
 354          */
 355         if (num_ports > 4)
 356                 num_ports = 4;
 357         for (index = 0; index < num_ports; index++)
 358                 cvmx_write_csr(CVMX_GMXX_TXX_THRESH(index, interface),
 359                                gmx_tx_thresh.u64);
 360
 361         return 0;
 362 }
 363
 364 /**
 365  * Returns the IPD/PKO port number for a port on teh given
 366  * interface.
 367  *
 368  * @interface: Interface to use
 369  * @port:      Port on the interface
 370  *
 371  * Returns IPD/PKO port number
 372  */
 373 int cvmx_helper_get_ipd_port(int interface, int port)
 374 {
 375         switch (interface) {
 376         case 0:
 377                 return port;
 378         case 1:
 379                 return port + 16;
 380         case 2:
 381                 return port + 32;
 382         case 3:
 383                 return port + 36;
 384         }
 385         return -1;
 386 }
 387
 388 /**
 389  * Returns the interface number for an IPD/PKO port number.
 390  *
 391  * @ipd_port: IPD/PKO port number
 392  *
 393  * Returns Interface number
 394  */
 395 int cvmx_helper_get_interface_num(int ipd_port)
 396 {
 397         if (ipd_port < 16)
 398                 return 0;
 399         else if (ipd_port < 32)
 400                 return 1;
 401         else if (ipd_port < 36)
 402                 return 2;
 403         else if (ipd_port < 40)
 404                 return 3;
 405         else
 406                 cvmx_dprintf("cvmx_helper_get_interface_num: Illegal IPD "
 407                              "port number\n");
 408
 409         return -1;
 410 }
 411
 412 /**
 413  * Returns the interface index number for an IPD/PKO port
 414  * number.
 415  *
 416  * @ipd_port: IPD/PKO port number
 417  *
 418  * Returns Interface index number
 419  */
 420 int cvmx_helper_get_interface_index_num(int ipd_port)
 421 {
 422         if (ipd_port < 32)
 423                 return ipd_port & 15;
 424         else if (ipd_port < 36)
 425                 return ipd_port & 3;
 426         else if (ipd_port < 40)
 427                 return ipd_port & 3;
 428         else
 429                 cvmx_dprintf("cvmx_helper_get_interface_index_num: "
 430                              "Illegal IPD port number\n");
 431
 432         return -1;
 433 }