drivers/staging/octeon/cvmx-cmd-queue.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  * Support functions for managing command queues used for
  30  * various hardware blocks.
  31  */
  32
  33 #include <linux/kernel.h>
  34
  35 #include <asm/octeon/octeon.h>
  36
  37 #include "cvmx-config.h"
  38 #include "cvmx-fpa.h"
  39 #include "cvmx-cmd-queue.h"
  40
  41 #include <asm/octeon/cvmx-npei-defs.h>
  42 #include <asm/octeon/cvmx-pexp-defs.h>
  43 #include "cvmx-pko-defs.h"
  44
  45 /**
  46  * This application uses this pointer to access the global queue
  47  * state. It points to a bootmem named block.
  48  */
  49 __cvmx_cmd_queue_all_state_t *__cvmx_cmd_queue_state_ptr;
  50
  51 /**
  52  * Initialize the Global queue state pointer.
  53  *
  54  * Returns CVMX_CMD_QUEUE_SUCCESS or a failure code
  55  */
  56 static cvmx_cmd_queue_result_t __cvmx_cmd_queue_init_state_ptr(void)
  57 {
  58         char *alloc_name = "cvmx_cmd_queues";
  59 #if defined(CONFIG_CAVIUM_RESERVE32) && CONFIG_CAVIUM_RESERVE32
  60         extern uint64_t octeon_reserve32_memory;
  61 #endif
  62
  63         if (likely(__cvmx_cmd_queue_state_ptr))
  64                 return CVMX_CMD_QUEUE_SUCCESS;
  65
  66 #if defined(CONFIG_CAVIUM_RESERVE32) && CONFIG_CAVIUM_RESERVE32
  67         if (octeon_reserve32_memory)
  68                 __cvmx_cmd_queue_state_ptr =
  69                     cvmx_bootmem_alloc_named_range(sizeof(*__cvmx_cmd_queue_state_ptr),
  70                                                    octeon_reserve32_memory,
  71                                                    octeon_reserve32_memory +
  72                                                    (CONFIG_CAVIUM_RESERVE32 <<
  73                                                     20) - 1, 128, alloc_name);
  74         else
  75 #endif
  76                 __cvmx_cmd_queue_state_ptr =
  77                     cvmx_bootmem_alloc_named(sizeof(*__cvmx_cmd_queue_state_ptr),
  78                                             128,
  79                                             alloc_name);
  80         if (__cvmx_cmd_queue_state_ptr)
  81                 memset(__cvmx_cmd_queue_state_ptr, 0,
  82                        sizeof(*__cvmx_cmd_queue_state_ptr));
  83         else {
  84                 struct cvmx_bootmem_named_block_desc *block_desc =
  85                     cvmx_bootmem_find_named_block(alloc_name);
  86                 if (block_desc)
  87                         __cvmx_cmd_queue_state_ptr =
  88                             cvmx_phys_to_ptr(block_desc->base_addr);
  89                 else {
  90                         cvmx_dprintf
  91                             ("ERROR: cvmx_cmd_queue_initialize: Unable to get named block %s.\n",
  92                              alloc_name);
  93                         return CVMX_CMD_QUEUE_NO_MEMORY;
  94                 }
  95         }
  96         return CVMX_CMD_QUEUE_SUCCESS;
  97 }
  98
  99 /**
 100  * Initialize a command queue for use. The initial FPA buffer is
 101  * allocated and the hardware unit is configured to point to the
 102  * new command queue.
 103  *
 104  * @queue_id:  Hardware command queue to initialize.
 105  * @max_depth: Maximum outstanding commands that can be queued.
 106  * @fpa_pool:  FPA pool the command queues should come from.
 107  * @pool_size: Size of each buffer in the FPA pool (bytes)
 108  *
 109  * Returns CVMX_CMD_QUEUE_SUCCESS or a failure code
 110  */
 111 cvmx_cmd_queue_result_t cvmx_cmd_queue_initialize(cvmx_cmd_queue_id_t queue_id,
 112                                                   int max_depth, int fpa_pool,
 113                                                   int pool_size)
 114 {
 115         __cvmx_cmd_queue_state_t *qstate;
 116         cvmx_cmd_queue_result_t result = __cvmx_cmd_queue_init_state_ptr();
 117         if (result != CVMX_CMD_QUEUE_SUCCESS)
 118                 return result;
 119
 120         qstate = __cvmx_cmd_queue_get_state(queue_id);
 121         if (qstate == NULL)
 122                 return CVMX_CMD_QUEUE_INVALID_PARAM;
 123
 124         /*
 125          * We artificially limit max_depth to 1<<20 words. It is an
 126          * arbitrary limit.
 127          */
 128         if (CVMX_CMD_QUEUE_ENABLE_MAX_DEPTH) {
 129                 if ((max_depth < 0) || (max_depth > 1 << 20))
 130                         return CVMX_CMD_QUEUE_INVALID_PARAM;
 131         } else if (max_depth != 0)
 132                 return CVMX_CMD_QUEUE_INVALID_PARAM;
 133
 134         if ((fpa_pool < 0) || (fpa_pool > 7))
 135                 return CVMX_CMD_QUEUE_INVALID_PARAM;
 136         if ((pool_size < 128) || (pool_size > 65536))
 137                 return CVMX_CMD_QUEUE_INVALID_PARAM;
 138
 139         /* See if someone else has already initialized the queue */
 140         if (qstate->base_ptr_div128) {
 141                 if (max_depth != (int)qstate->max_depth) {
 142                         cvmx_dprintf("ERROR: cvmx_cmd_queue_initialize: "
 143                                 "Queue already initalized with different "
 144                                 "max_depth (%d).\n",
 145                              (int)qstate->max_depth);
 146                         return CVMX_CMD_QUEUE_INVALID_PARAM;
 147                 }
 148                 if (fpa_pool != qstate->fpa_pool) {
 149                         cvmx_dprintf("ERROR: cvmx_cmd_queue_initialize: "
 150                                 "Queue already initalized with different "
 151                                 "FPA pool (%u).\n",
 152                              qstate->fpa_pool);
 153                         return CVMX_CMD_QUEUE_INVALID_PARAM;
 154                 }
 155                 if ((pool_size >> 3) - 1 != qstate->pool_size_m1) {
 156                         cvmx_dprintf("ERROR: cvmx_cmd_queue_initialize: "
 157                                 "Queue already initalized with different "
 158                                 "FPA pool size (%u).\n",
 159                              (qstate->pool_size_m1 + 1) << 3);
 160                         return CVMX_CMD_QUEUE_INVALID_PARAM;
 161                 }
 162                 CVMX_SYNCWS;
 163                 return CVMX_CMD_QUEUE_ALREADY_SETUP;
 164         } else {
 165                 union cvmx_fpa_ctl_status status;
 166                 void *buffer;
 167
 168                 status.u64 = cvmx_read_csr(CVMX_FPA_CTL_STATUS);
 169                 if (!status.s.enb) {
 170                         cvmx_dprintf("ERROR: cvmx_cmd_queue_initialize: "
 171                                      "FPA is not enabled.\n");
 172                         return CVMX_CMD_QUEUE_NO_MEMORY;
 173                 }
 174                 buffer = cvmx_fpa_alloc(fpa_pool);
 175                 if (buffer == NULL) {
 176                         cvmx_dprintf("ERROR: cvmx_cmd_queue_initialize: "
 177                                      "Unable to allocate initial buffer.\n");
 178                         return CVMX_CMD_QUEUE_NO_MEMORY;
 179                 }
 180
 181                 memset(qstate, 0, sizeof(*qstate));
 182                 qstate->max_depth = max_depth;
 183                 qstate->fpa_pool = fpa_pool;
 184                 qstate->pool_size_m1 = (pool_size >> 3) - 1;
 185                 qstate->base_ptr_div128 = cvmx_ptr_to_phys(buffer) / 128;
 186                 /*
 187                  * We zeroed the now serving field so we need to also
 188                  * zero the ticket.
 189                  */
 190                 __cvmx_cmd_queue_state_ptr->
 191                     ticket[__cvmx_cmd_queue_get_index(queue_id)] = 0;
 192                 CVMX_SYNCWS;
 193                 return CVMX_CMD_QUEUE_SUCCESS;
 194         }
 195 }
 196
 197 /**
 198  * Shutdown a queue a free it's command buffers to the FPA. The
 199  * hardware connected to the queue must be stopped before this
 200  * function is called.
 201  *
 202  * @queue_id: Queue to shutdown
 203  *
 204  * Returns CVMX_CMD_QUEUE_SUCCESS or a failure code
 205  */
 206 cvmx_cmd_queue_result_t cvmx_cmd_queue_shutdown(cvmx_cmd_queue_id_t queue_id)
 207 {
 208         __cvmx_cmd_queue_state_t *qptr = __cvmx_cmd_queue_get_state(queue_id);
 209         if (qptr == NULL) {
 210                 cvmx_dprintf("ERROR: cvmx_cmd_queue_shutdown: Unable to "
 211                              "get queue information.\n");
 212                 return CVMX_CMD_QUEUE_INVALID_PARAM;
 213         }
 214
 215         if (cvmx_cmd_queue_length(queue_id) > 0) {
 216                 cvmx_dprintf("ERROR: cvmx_cmd_queue_shutdown: Queue still "
 217                              "has data in it.\n");
 218                 return CVMX_CMD_QUEUE_FULL;
 219         }
 220
 221         __cvmx_cmd_queue_lock(queue_id, qptr);
 222         if (qptr->base_ptr_div128) {
 223                 cvmx_fpa_free(cvmx_phys_to_ptr
 224                               ((uint64_t) qptr->base_ptr_div128 << 7),
 225                               qptr->fpa_pool, 0);
 226                 qptr->base_ptr_div128 = 0;
 227         }
 228         __cvmx_cmd_queue_unlock(qptr);
 229
 230         return CVMX_CMD_QUEUE_SUCCESS;
 231 }
 232
 233 /**
 234  * Return the number of command words pending in the queue. This
 235  * function may be relatively slow for some hardware units.
 236  *
 237  * @queue_id: Hardware command queue to query
 238  *
 239  * Returns Number of outstanding commands
 240  */
 241 int cvmx_cmd_queue_length(cvmx_cmd_queue_id_t queue_id)
 242 {
 243         if (CVMX_ENABLE_PARAMETER_CHECKING) {
 244                 if (__cvmx_cmd_queue_get_state(queue_id) == NULL)
 245                         return CVMX_CMD_QUEUE_INVALID_PARAM;
 246         }
 247
 248         /*
 249          * The cast is here so gcc with check that all values in the
 250          * cvmx_cmd_queue_id_t enumeration are here.
 251          */
 252         switch ((cvmx_cmd_queue_id_t) (queue_id & 0xff0000)) {
 253         case CVMX_CMD_QUEUE_PKO_BASE:
 254                 /*
 255                  * FIXME: Need atomic lock on
 256                  * CVMX_PKO_REG_READ_IDX. Right now we are normally
 257                  * called with the queue lock, so that is a SLIGHT
 258                  * amount of protection.
 259                  */
 260                 cvmx_write_csr(CVMX_PKO_REG_READ_IDX, queue_id & 0xffff);
 261                 if (OCTEON_IS_MODEL(OCTEON_CN3XXX)) {
 262                         union cvmx_pko_mem_debug9 debug9;
 263                         debug9.u64 = cvmx_read_csr(CVMX_PKO_MEM_DEBUG9);
 264                         return debug9.cn38xx.doorbell;
 265                 } else {
 266                         union cvmx_pko_mem_debug8 debug8;
 267                         debug8.u64 = cvmx_read_csr(CVMX_PKO_MEM_DEBUG8);
 268                         return debug8.cn58xx.doorbell;
 269                 }
 270         case CVMX_CMD_QUEUE_ZIP:
 271         case CVMX_CMD_QUEUE_DFA:
 272         case CVMX_CMD_QUEUE_RAID:
 273                 /* FIXME: Implement other lengths */
 274                 return 0;
 275         case CVMX_CMD_QUEUE_DMA_BASE:
 276                 {
 277                         union cvmx_npei_dmax_counts dmax_counts;
 278                         dmax_counts.u64 =
 279                             cvmx_read_csr(CVMX_PEXP_NPEI_DMAX_COUNTS
 280                                           (queue_id & 0x7));
 281                         return dmax_counts.s.dbell;
 282                 }
 283         case CVMX_CMD_QUEUE_END:
 284                 return CVMX_CMD_QUEUE_INVALID_PARAM;
 285         }
 286         return CVMX_CMD_QUEUE_INVALID_PARAM;
 287 }
 288
 289 /**
 290  * Return the command buffer to be written to. The purpose of this
 291  * function is to allow CVMX routine access t othe low level buffer
 292  * for initial hardware setup. User applications should not call this
 293  * function directly.
 294  *
 295  * @queue_id: Command queue to query
 296  *
 297  * Returns Command buffer or NULL on failure
 298  */
 299 void *cvmx_cmd_queue_buffer(cvmx_cmd_queue_id_t queue_id)
 300 {
 301         __cvmx_cmd_queue_state_t *qptr = __cvmx_cmd_queue_get_state(queue_id);
 302         if (qptr && qptr->base_ptr_div128)
 303                 return cvmx_phys_to_ptr((uint64_t) qptr->base_ptr_div128 << 7);
 304         else
 305                 return NULL;
 306 }