205 lines
5.7 KiB
C
205 lines
5.7 KiB
C
/*
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* Copyright (C) 2007 Krzysztof Halasa <khc@pm.waw.pl>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2 of the GNU General Public License
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* as published by the Free Software Foundation.
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*/
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#ifndef IXP4XX_QMGR_H
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#define IXP4XX_QMGR_H
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#include <linux/io.h>
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#include <linux/kernel.h>
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#define DEBUG_QMGR 0
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#define HALF_QUEUES 32
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#define QUEUES 64
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#define MAX_QUEUE_LENGTH 4 /* in dwords */
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#define QUEUE_STAT1_EMPTY 1 /* queue status bits */
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#define QUEUE_STAT1_NEARLY_EMPTY 2
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#define QUEUE_STAT1_NEARLY_FULL 4
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#define QUEUE_STAT1_FULL 8
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#define QUEUE_STAT2_UNDERFLOW 1
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#define QUEUE_STAT2_OVERFLOW 2
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#define QUEUE_WATERMARK_0_ENTRIES 0
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#define QUEUE_WATERMARK_1_ENTRY 1
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#define QUEUE_WATERMARK_2_ENTRIES 2
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#define QUEUE_WATERMARK_4_ENTRIES 3
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#define QUEUE_WATERMARK_8_ENTRIES 4
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#define QUEUE_WATERMARK_16_ENTRIES 5
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#define QUEUE_WATERMARK_32_ENTRIES 6
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#define QUEUE_WATERMARK_64_ENTRIES 7
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/* queue interrupt request conditions */
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#define QUEUE_IRQ_SRC_EMPTY 0
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#define QUEUE_IRQ_SRC_NEARLY_EMPTY 1
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#define QUEUE_IRQ_SRC_NEARLY_FULL 2
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#define QUEUE_IRQ_SRC_FULL 3
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#define QUEUE_IRQ_SRC_NOT_EMPTY 4
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#define QUEUE_IRQ_SRC_NOT_NEARLY_EMPTY 5
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#define QUEUE_IRQ_SRC_NOT_NEARLY_FULL 6
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#define QUEUE_IRQ_SRC_NOT_FULL 7
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struct qmgr_regs {
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u32 acc[QUEUES][MAX_QUEUE_LENGTH]; /* 0x000 - 0x3FF */
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u32 stat1[4]; /* 0x400 - 0x40F */
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u32 stat2[2]; /* 0x410 - 0x417 */
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u32 statne_h; /* 0x418 - queue nearly empty */
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u32 statf_h; /* 0x41C - queue full */
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u32 irqsrc[4]; /* 0x420 - 0x42F IRC source */
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u32 irqen[2]; /* 0x430 - 0x437 IRQ enabled */
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u32 irqstat[2]; /* 0x438 - 0x43F - IRQ access only */
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u32 reserved[1776];
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u32 sram[2048]; /* 0x2000 - 0x3FFF - config and buffer */
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};
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void qmgr_set_irq(unsigned int queue, int src,
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void (*handler)(void *pdev), void *pdev);
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void qmgr_enable_irq(unsigned int queue);
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void qmgr_disable_irq(unsigned int queue);
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/* request_ and release_queue() must be called from non-IRQ context */
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#if DEBUG_QMGR
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extern char qmgr_queue_descs[QUEUES][32];
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int qmgr_request_queue(unsigned int queue, unsigned int len /* dwords */,
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unsigned int nearly_empty_watermark,
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unsigned int nearly_full_watermark,
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const char *desc_format, const char* name);
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#else
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int __qmgr_request_queue(unsigned int queue, unsigned int len /* dwords */,
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unsigned int nearly_empty_watermark,
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unsigned int nearly_full_watermark);
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#define qmgr_request_queue(queue, len, nearly_empty_watermark, \
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nearly_full_watermark, desc_format, name) \
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__qmgr_request_queue(queue, len, nearly_empty_watermark, \
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nearly_full_watermark)
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#endif
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void qmgr_release_queue(unsigned int queue);
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static inline void qmgr_put_entry(unsigned int queue, u32 val)
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{
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extern struct qmgr_regs __iomem *qmgr_regs;
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#if DEBUG_QMGR
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BUG_ON(!qmgr_queue_descs[queue]); /* not yet requested */
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printk(KERN_DEBUG "Queue %s(%i) put %X\n",
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qmgr_queue_descs[queue], queue, val);
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#endif
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__raw_writel(val, &qmgr_regs->acc[queue][0]);
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}
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static inline u32 qmgr_get_entry(unsigned int queue)
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{
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u32 val;
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extern struct qmgr_regs __iomem *qmgr_regs;
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val = __raw_readl(&qmgr_regs->acc[queue][0]);
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#if DEBUG_QMGR
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BUG_ON(!qmgr_queue_descs[queue]); /* not yet requested */
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printk(KERN_DEBUG "Queue %s(%i) get %X\n",
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qmgr_queue_descs[queue], queue, val);
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#endif
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return val;
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}
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static inline int __qmgr_get_stat1(unsigned int queue)
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{
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extern struct qmgr_regs __iomem *qmgr_regs;
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return (__raw_readl(&qmgr_regs->stat1[queue >> 3])
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>> ((queue & 7) << 2)) & 0xF;
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}
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static inline int __qmgr_get_stat2(unsigned int queue)
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{
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extern struct qmgr_regs __iomem *qmgr_regs;
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BUG_ON(queue >= HALF_QUEUES);
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return (__raw_readl(&qmgr_regs->stat2[queue >> 4])
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>> ((queue & 0xF) << 1)) & 0x3;
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}
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/**
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* qmgr_stat_empty() - checks if a hardware queue is empty
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* @queue: queue number
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*
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* Returns non-zero value if the queue is empty.
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*/
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static inline int qmgr_stat_empty(unsigned int queue)
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{
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BUG_ON(queue >= HALF_QUEUES);
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return __qmgr_get_stat1(queue) & QUEUE_STAT1_EMPTY;
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}
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/**
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* qmgr_stat_below_low_watermark() - checks if a queue is below low watermark
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* @queue: queue number
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*
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* Returns non-zero value if the queue is below low watermark.
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*/
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static inline int qmgr_stat_below_low_watermark(unsigned int queue)
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{
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extern struct qmgr_regs __iomem *qmgr_regs;
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if (queue >= HALF_QUEUES)
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return (__raw_readl(&qmgr_regs->statne_h) >>
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(queue - HALF_QUEUES)) & 0x01;
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return __qmgr_get_stat1(queue) & QUEUE_STAT1_NEARLY_EMPTY;
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}
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/**
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* qmgr_stat_above_high_watermark() - checks if a queue is above high watermark
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* @queue: queue number
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*
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* Returns non-zero value if the queue is above high watermark
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*/
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static inline int qmgr_stat_above_high_watermark(unsigned int queue)
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{
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BUG_ON(queue >= HALF_QUEUES);
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return __qmgr_get_stat1(queue) & QUEUE_STAT1_NEARLY_FULL;
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}
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/**
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* qmgr_stat_full() - checks if a hardware queue is full
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* @queue: queue number
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*
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* Returns non-zero value if the queue is full.
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*/
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static inline int qmgr_stat_full(unsigned int queue)
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{
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extern struct qmgr_regs __iomem *qmgr_regs;
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if (queue >= HALF_QUEUES)
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return (__raw_readl(&qmgr_regs->statf_h) >>
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(queue - HALF_QUEUES)) & 0x01;
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return __qmgr_get_stat1(queue) & QUEUE_STAT1_FULL;
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}
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/**
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* qmgr_stat_underflow() - checks if a hardware queue experienced underflow
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* @queue: queue number
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*
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* Returns non-zero value if the queue experienced underflow.
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*/
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static inline int qmgr_stat_underflow(unsigned int queue)
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{
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return __qmgr_get_stat2(queue) & QUEUE_STAT2_UNDERFLOW;
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}
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/**
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* qmgr_stat_overflow() - checks if a hardware queue experienced overflow
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* @queue: queue number
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*
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* Returns non-zero value if the queue experienced overflow.
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*/
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static inline int qmgr_stat_overflow(unsigned int queue)
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{
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return __qmgr_get_stat2(queue) & QUEUE_STAT2_OVERFLOW;
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}
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#endif
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