/***********************license start***************
* Author : Cavium Networks
*
* Contact : support @ caviumnetworks . com
* This file is part of the OCTEON SDK
*
* Copyright ( c ) 2003 - 2008 Cavium Networks
*
* This file is free software ; you can redistribute it and / or modify
* it under the terms of the GNU General Public License , Version 2 , as
* published by the Free Software Foundation .
*
* This file is distributed in the hope that it will be useful , but
* AS - IS and WITHOUT ANY WARRANTY ; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE , TITLE , or
* NONINFRINGEMENT . See the GNU General Public License for more
* details .
*
* You should have received a copy of the GNU General Public License
* along with this file ; if not , write to the Free Software
* Foundation , Inc . , 51 Franklin St , Fifth Floor , Boston , MA 02110 - 1301 USA
* or visit http : //www.gnu.org/licenses/.
*
* This file may also be available under a different license from Cavium .
* Contact Cavium Networks for more information
***********************license end**************************************/
/*
* Support functions for managing command queues used for
* various hardware blocks .
*/
#include <linux/kernel.h>
#include <asm /octeon/octeon.h>
#include <asm /octeon/cvmx-config.h>
#include <asm /octeon/cvmx-fpa.h>
#include <asm /octeon/cvmx-cmd-queue.h>
#include <asm /octeon/cvmx-npei-defs.h>
#include <asm /octeon/cvmx-pexp-defs.h>
#include <asm /octeon/cvmx-pko-defs.h>
/*
* This application uses this pointer to access the global queue
* state . It points to a bootmem named block .
*/
__cvmx_cmd_queue_all_state_t *__cvmx_cmd_queue_state_ptr;
EXPORT_SYMBOL_GPL(__cvmx_cmd_queue_state_ptr);
/*
* Initialize the Global queue state pointer .
*
* Returns CVMX_CMD_QUEUE_SUCCESS or a failure code
*/
static cvmx_cmd_queue_result_t __cvmx_cmd_queue_init_state_ptr(void )
{
char *alloc_name = "cvmx_cmd_queues" ;
extern uint64_t octeon_reserve32_memory;
if (likely(__cvmx_cmd_queue_state_ptr))
return CVMX_CMD_QUEUE_SUCCESS;
if (octeon_reserve32_memory)
__cvmx_cmd_queue_state_ptr =
cvmx_bootmem_alloc_named_range(sizeof (*__cvmx_cmd_queue_state_ptr),
octeon_reserve32_memory,
octeon_reserve32_memory +
(CONFIG_CAVIUM_RESERVE32 <<
20 ) - 1 , 128 , alloc_name);
else
__cvmx_cmd_queue_state_ptr =
cvmx_bootmem_alloc_named(sizeof (*__cvmx_cmd_queue_state_ptr),
128 ,
alloc_name);
if (__cvmx_cmd_queue_state_ptr)
memset(__cvmx_cmd_queue_state_ptr, 0 ,
sizeof (*__cvmx_cmd_queue_state_ptr));
else {
struct cvmx_bootmem_named_block_desc *block_desc =
cvmx_bootmem_find_named_block(alloc_name);
if (block_desc)
__cvmx_cmd_queue_state_ptr =
cvmx_phys_to_ptr(block_desc->base_addr);
else {
cvmx_dprintf
("ERROR: cvmx_cmd_queue_initialize: Unable to get named block %s.\n" ,
alloc_name);
return CVMX_CMD_QUEUE_NO_MEMORY;
}
}
return CVMX_CMD_QUEUE_SUCCESS;
}
/*
* Initialize a command queue for use . The initial FPA buffer is
* allocated and the hardware unit is configured to point to the
* new command queue .
*
* @ queue_id : Hardware command queue to initialize .
* @ max_depth : Maximum outstanding commands that can be queued .
* @ fpa_pool : FPA pool the command queues should come from .
* @ pool_size : Size of each buffer in the FPA pool ( bytes )
*
* Returns CVMX_CMD_QUEUE_SUCCESS or a failure code
*/
cvmx_cmd_queue_result_t cvmx_cmd_queue_initialize(cvmx_cmd_queue_id_t queue_id,
int max_depth, int fpa_pool,
int pool_size)
{
__cvmx_cmd_queue_state_t *qstate;
cvmx_cmd_queue_result_t result = __cvmx_cmd_queue_init_state_ptr();
if (result != CVMX_CMD_QUEUE_SUCCESS)
return result;
qstate = __cvmx_cmd_queue_get_state(queue_id);
if (qstate == NULL)
return CVMX_CMD_QUEUE_INVALID_PARAM;
/*
* We artificially limit max_depth to 1 < < 20 words . It is an
* arbitrary limit .
*/
if (CVMX_CMD_QUEUE_ENABLE_MAX_DEPTH) {
if ((max_depth < 0 ) || (max_depth > 1 << 20 ))
return CVMX_CMD_QUEUE_INVALID_PARAM;
} else if (max_depth != 0 )
return CVMX_CMD_QUEUE_INVALID_PARAM;
if ((fpa_pool < 0 ) || (fpa_pool > 7 ))
return CVMX_CMD_QUEUE_INVALID_PARAM;
if ((pool_size < 128 ) || (pool_size > 65536 ))
return CVMX_CMD_QUEUE_INVALID_PARAM;
/* See if someone else has already initialized the queue */
if (qstate->base_ptr_div128) {
if (max_depth != (int )qstate->max_depth) {
cvmx_dprintf("ERROR: cvmx_cmd_queue_initialize: "
"Queue already initialized with different "
"max_depth (%d).\n" ,
(int )qstate->max_depth);
return CVMX_CMD_QUEUE_INVALID_PARAM;
}
if (fpa_pool != qstate->fpa_pool) {
cvmx_dprintf("ERROR: cvmx_cmd_queue_initialize: "
"Queue already initialized with different "
"FPA pool (%u).\n" ,
qstate->fpa_pool);
return CVMX_CMD_QUEUE_INVALID_PARAM;
}
if ((pool_size >> 3 ) - 1 != qstate->pool_size_m1) {
cvmx_dprintf("ERROR: cvmx_cmd_queue_initialize: "
"Queue already initialized with different "
"FPA pool size (%u).\n" ,
(qstate->pool_size_m1 + 1 ) << 3 );
return CVMX_CMD_QUEUE_INVALID_PARAM;
}
CVMX_SYNCWS;
return CVMX_CMD_QUEUE_ALREADY_SETUP;
} else {
union cvmx_fpa_ctl_status status;
void *buffer;
status.u64 = cvmx_read_csr(CVMX_FPA_CTL_STATUS);
if (!status.s.enb) {
cvmx_dprintf("ERROR: cvmx_cmd_queue_initialize: "
"FPA is not enabled.\n" );
return CVMX_CMD_QUEUE_NO_MEMORY;
}
buffer = cvmx_fpa_alloc(fpa_pool);
if (buffer == NULL) {
cvmx_dprintf("ERROR: cvmx_cmd_queue_initialize: "
"Unable to allocate initial buffer.\n" );
return CVMX_CMD_QUEUE_NO_MEMORY;
}
memset(qstate, 0 , sizeof (*qstate));
qstate->max_depth = max_depth;
qstate->fpa_pool = fpa_pool;
qstate->pool_size_m1 = (pool_size >> 3 ) - 1 ;
qstate->base_ptr_div128 = cvmx_ptr_to_phys(buffer) / 128 ;
/*
* We zeroed the now serving field so we need to also
* zero the ticket .
*/
__cvmx_cmd_queue_state_ptr->
ticket[__cvmx_cmd_queue_get_index(queue_id)] = 0 ;
CVMX_SYNCWS;
return CVMX_CMD_QUEUE_SUCCESS;
}
}
/*
* Shutdown a queue and free its command buffers to the FPA . The
* hardware connected to the queue must be stopped before this
* function is called .
*
* @ queue_id : Queue to shutdown
*
* Returns CVMX_CMD_QUEUE_SUCCESS or a failure code
*/
cvmx_cmd_queue_result_t cvmx_cmd_queue_shutdown(cvmx_cmd_queue_id_t queue_id)
{
__cvmx_cmd_queue_state_t *qptr = __cvmx_cmd_queue_get_state(queue_id);
if (qptr == NULL) {
cvmx_dprintf("ERROR: cvmx_cmd_queue_shutdown: Unable to "
"get queue information.\n" );
return CVMX_CMD_QUEUE_INVALID_PARAM;
}
if (cvmx_cmd_queue_length(queue_id) > 0 ) {
cvmx_dprintf("ERROR: cvmx_cmd_queue_shutdown: Queue still "
"has data in it.\n" );
return CVMX_CMD_QUEUE_FULL;
}
__cvmx_cmd_queue_lock(queue_id, qptr);
if (qptr->base_ptr_div128) {
cvmx_fpa_free(cvmx_phys_to_ptr
((uint64_t) qptr->base_ptr_div128 << 7 ),
qptr->fpa_pool, 0 );
qptr->base_ptr_div128 = 0 ;
}
__cvmx_cmd_queue_unlock(qptr);
return CVMX_CMD_QUEUE_SUCCESS;
}
/*
* Return the number of command words pending in the queue . This
* function may be relatively slow for some hardware units .
*
* @ queue_id : Hardware command queue to query
*
* Returns Number of outstanding commands
*/
int cvmx_cmd_queue_length(cvmx_cmd_queue_id_t queue_id)
{
if (CVMX_ENABLE_PARAMETER_CHECKING) {
if (__cvmx_cmd_queue_get_state(queue_id) == NULL)
return CVMX_CMD_QUEUE_INVALID_PARAM;
}
/*
* The cast is here so gcc with check that all values in the
* cvmx_cmd_queue_id_t enumeration are here .
*/
switch ((cvmx_cmd_queue_id_t) (queue_id & 0 xff0000)) {
case CVMX_CMD_QUEUE_PKO_BASE:
/*
* FIXME : Need atomic lock on
* CVMX_PKO_REG_READ_IDX . Right now we are normally
* called with the queue lock , so that is a SLIGHT
* amount of protection .
*/
cvmx_write_csr(CVMX_PKO_REG_READ_IDX, queue_id & 0 xffff);
if (OCTEON_IS_MODEL(OCTEON_CN3XXX)) {
union cvmx_pko_mem_debug9 debug9;
debug9.u64 = cvmx_read_csr(CVMX_PKO_MEM_DEBUG9);
return debug9.cn38xx.doorbell;
} else {
union cvmx_pko_mem_debug8 debug8;
debug8.u64 = cvmx_read_csr(CVMX_PKO_MEM_DEBUG8);
return debug8.cn50xx.doorbell;
}
case CVMX_CMD_QUEUE_ZIP:
case CVMX_CMD_QUEUE_DFA:
case CVMX_CMD_QUEUE_RAID:
/* FIXME: Implement other lengths */
return 0 ;
case CVMX_CMD_QUEUE_DMA_BASE:
{
union cvmx_npei_dmax_counts dmax_counts;
dmax_counts.u64 =
cvmx_read_csr(CVMX_PEXP_NPEI_DMAX_COUNTS
(queue_id & 0 x7));
return dmax_counts.s.dbell;
}
case CVMX_CMD_QUEUE_END:
return CVMX_CMD_QUEUE_INVALID_PARAM;
}
return CVMX_CMD_QUEUE_INVALID_PARAM;
}
/*
* Return the command buffer to be written to . The purpose of this
* function is to allow CVMX routine access to the low level buffer
* for initial hardware setup . User applications should not call this
* function directly .
*
* @ queue_id : Command queue to query
*
* Returns Command buffer or NULL on failure
*/
void *cvmx_cmd_queue_buffer(cvmx_cmd_queue_id_t queue_id)
{
__cvmx_cmd_queue_state_t *qptr = __cvmx_cmd_queue_get_state(queue_id);
if (qptr && qptr->base_ptr_div128)
return cvmx_phys_to_ptr((uint64_t) qptr->base_ptr_div128 << 7 );
else
return NULL;
}
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