diff options
Diffstat (limited to 'arch/mips/cavium-octeon/executive/cvmx-cmd-queue.c')
| -rw-r--r-- | arch/mips/cavium-octeon/executive/cvmx-cmd-queue.c | 303 |
1 files changed, 303 insertions, 0 deletions
diff --git a/arch/mips/cavium-octeon/executive/cvmx-cmd-queue.c b/arch/mips/cavium-octeon/executive/cvmx-cmd-queue.c new file mode 100644 index 0000000000..aa7bbf8d0d --- /dev/null +++ b/arch/mips/cavium-octeon/executive/cvmx-cmd-queue.c @@ -0,0 +1,303 @@ +/***********************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 a free it's 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 & 0xff0000)) { + 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 & 0xffff); + 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 & 0x7)); + 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 t othe 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; +} |