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The QMSS (Queue Manager Sub System) found on Keystone SOCs is one of the main hardware sub system which forms the backbone of the Keystone Multi-core Navigator. QMSS consist of queue managers, packed-data structure processors(PDSP), linking RAM, descriptor pools and infrastructure Packet DMA. The Queue Manager is a hardware module that is responsible for accelerating management of the packet queues. Packets are queued/de-queued by writing or reading descriptor address to a particular memory mapped location. The PDSPs perform QMSS related functions like accumulation, QoS, or event management. Linking RAM registers are used to link the descriptors which are stored in descriptor RAM. Descriptor RAM is configurable as internal or external memory. The QMSS driver manages the PDSP setups, linking RAM regions, queue pool management (allocation, push, pop and notify) and descriptor pool management. The specifics on the device tree bindings for QMSS can be found in: Documentation/devicetree/bindings/soc/keystone-navigator-qmss.txt Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Kumar Gala <galak@codeaurora.org> Cc: Olof Johansson <olof@lixom.net> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Grant Likely <grant.likely@linaro.org> Cc: Rob Herring <robh+dt@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Sandeep Nair <sandeep_n@ti.com> Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
90 lines
3 KiB
C
90 lines
3 KiB
C
/*
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* Keystone Navigator Queue Management Sub-System header
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*
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* Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com
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* Author: Sandeep Nair <sandeep_n@ti.com>
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* Cyril Chemparathy <cyril@ti.com>
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* Santosh Shilimkar <santosh.shilimkar@ti.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation version 2.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef __SOC_TI_KNAV_QMSS_H__
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#define __SOC_TI_KNAV_QMSS_H__
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#include <linux/err.h>
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#include <linux/time.h>
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#include <linux/atomic.h>
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#include <linux/device.h>
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#include <linux/fcntl.h>
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#include <linux/dma-mapping.h>
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/* queue types */
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#define KNAV_QUEUE_QPEND ((unsigned)-2) /* interruptible qpend queue */
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#define KNAV_QUEUE_ACC ((unsigned)-3) /* Accumulated queue */
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#define KNAV_QUEUE_GP ((unsigned)-4) /* General purpose queue */
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/* queue flags */
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#define KNAV_QUEUE_SHARED 0x0001 /* Queue can be shared */
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/**
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* enum knav_queue_ctrl_cmd - queue operations.
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* @KNAV_QUEUE_GET_ID: Get the ID number for an open queue
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* @KNAV_QUEUE_FLUSH: forcibly empty a queue if possible
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* @KNAV_QUEUE_SET_NOTIFIER: Set a notifier callback to a queue handle.
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* @KNAV_QUEUE_ENABLE_NOTIFY: Enable notifier callback for a queue handle.
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* @KNAV_QUEUE_DISABLE_NOTIFY: Disable notifier callback for a queue handle.
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* @KNAV_QUEUE_GET_COUNT: Get number of queues.
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*/
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enum knav_queue_ctrl_cmd {
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KNAV_QUEUE_GET_ID,
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KNAV_QUEUE_FLUSH,
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KNAV_QUEUE_SET_NOTIFIER,
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KNAV_QUEUE_ENABLE_NOTIFY,
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KNAV_QUEUE_DISABLE_NOTIFY,
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KNAV_QUEUE_GET_COUNT
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};
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/* Queue notifier callback prototype */
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typedef void (*knav_queue_notify_fn)(void *arg);
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/**
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* struct knav_queue_notify_config: Notifier configuration
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* @fn: Notifier function
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* @fn_arg: Notifier function arguments
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*/
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struct knav_queue_notify_config {
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knav_queue_notify_fn fn;
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void *fn_arg;
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};
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void *knav_queue_open(const char *name, unsigned id,
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unsigned flags);
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void knav_queue_close(void *qhandle);
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int knav_queue_device_control(void *qhandle,
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enum knav_queue_ctrl_cmd cmd,
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unsigned long arg);
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dma_addr_t knav_queue_pop(void *qhandle, unsigned *size);
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int knav_queue_push(void *qhandle, dma_addr_t dma,
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unsigned size, unsigned flags);
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void *knav_pool_create(const char *name,
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int num_desc, int region_id);
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void knav_pool_destroy(void *ph);
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int knav_pool_count(void *ph);
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void *knav_pool_desc_get(void *ph);
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void knav_pool_desc_put(void *ph, void *desc);
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int knav_pool_desc_map(void *ph, void *desc, unsigned size,
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dma_addr_t *dma, unsigned *dma_sz);
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void *knav_pool_desc_unmap(void *ph, dma_addr_t dma, unsigned dma_sz);
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dma_addr_t knav_pool_desc_virt_to_dma(void *ph, void *virt);
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void *knav_pool_desc_dma_to_virt(void *ph, dma_addr_t dma);
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#endif /* __SOC_TI_KNAV_QMSS_H__ */
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