LXR linux/include/linux/soc/ixp4xx/qmgr.h

   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/*
   3 * Copyright (C) 2007 Krzysztof Halasa <khc@pm.waw.pl>
   4 */
   5
   6#ifndef IXP4XX_QMGR_H
   7#define IXP4XX_QMGR_H
   8
   9#include <linux/io.h>
  10#include <linux/kernel.h>
  11
  12#define DEBUG_QMGR      0
  13
  14#define HALF_QUEUES     32
  15#define QUEUES          64
  16#define MAX_QUEUE_LENGTH 4      /* in dwords */
  17
  18#define QUEUE_STAT1_EMPTY               1 /* queue status bits */
  19#define QUEUE_STAT1_NEARLY_EMPTY        2
  20#define QUEUE_STAT1_NEARLY_FULL         4
  21#define QUEUE_STAT1_FULL                8
  22#define QUEUE_STAT2_UNDERFLOW           1
  23#define QUEUE_STAT2_OVERFLOW            2
  24
  25#define QUEUE_WATERMARK_0_ENTRIES       0
  26#define QUEUE_WATERMARK_1_ENTRY         1
  27#define QUEUE_WATERMARK_2_ENTRIES       2
  28#define QUEUE_WATERMARK_4_ENTRIES       3
  29#define QUEUE_WATERMARK_8_ENTRIES       4
  30#define QUEUE_WATERMARK_16_ENTRIES      5
  31#define QUEUE_WATERMARK_32_ENTRIES      6
  32#define QUEUE_WATERMARK_64_ENTRIES      7
  33
  34/* queue interrupt request conditions */
  35#define QUEUE_IRQ_SRC_EMPTY             0
  36#define QUEUE_IRQ_SRC_NEARLY_EMPTY      1
  37#define QUEUE_IRQ_SRC_NEARLY_FULL       2
  38#define QUEUE_IRQ_SRC_FULL              3
  39#define QUEUE_IRQ_SRC_NOT_EMPTY         4
  40#define QUEUE_IRQ_SRC_NOT_NEARLY_EMPTY  5
  41#define QUEUE_IRQ_SRC_NOT_NEARLY_FULL   6
  42#define QUEUE_IRQ_SRC_NOT_FULL          7
  43
  44struct qmgr_regs {
  45        u32 acc[QUEUES][MAX_QUEUE_LENGTH]; /* 0x000 - 0x3FF */
  46        u32 stat1[4];           /* 0x400 - 0x40F */
  47        u32 stat2[2];           /* 0x410 - 0x417 */
  48        u32 statne_h;           /* 0x418 - queue nearly empty */
  49        u32 statf_h;            /* 0x41C - queue full */
  50        u32 irqsrc[4];          /* 0x420 - 0x42F IRC source */
  51        u32 irqen[2];           /* 0x430 - 0x437 IRQ enabled */
  52        u32 irqstat[2];         /* 0x438 - 0x43F - IRQ access only */
  53        u32 reserved[1776];
  54        u32 sram[2048];         /* 0x2000 - 0x3FFF - config and buffer */
  55};
  56
  57void qmgr_put_entry(unsigned int queue, u32 val);
  58u32 qmgr_get_entry(unsigned int queue);
  59int qmgr_stat_empty(unsigned int queue);
  60int qmgr_stat_below_low_watermark(unsigned int queue);
  61int qmgr_stat_full(unsigned int queue);
  62int qmgr_stat_overflow(unsigned int queue);
  63void qmgr_release_queue(unsigned int queue);
  64void qmgr_set_irq(unsigned int queue, int src,
  65                  void (*handler)(void *pdev), void *pdev);
  66void qmgr_enable_irq(unsigned int queue);
  67void qmgr_disable_irq(unsigned int queue);
  68
  69/* request_ and release_queue() must be called from non-IRQ context */
  70
  71#if DEBUG_QMGR
  72extern char qmgr_queue_descs[QUEUES][32];
  73
  74int qmgr_request_queue(unsigned int queue, unsigned int len /* dwords */,
  75                       unsigned int nearly_empty_watermark,
  76                       unsigned int nearly_full_watermark,
  77                       const char *desc_format, const char* name);
  78#else
  79int __qmgr_request_queue(unsigned int queue, unsigned int len /* dwords */,
  80                         unsigned int nearly_empty_watermark,
  81                         unsigned int nearly_full_watermark);
  82#define qmgr_request_queue(queue, len, nearly_empty_watermark,          \
  83                           nearly_full_watermark, desc_format, name)    \
  84        __qmgr_request_queue(queue, len, nearly_empty_watermark,        \
  85                             nearly_full_watermark)
  86#endif
  87
  88#endif
  89