include/linux/soc/ixp4xx/qmgr.h

   1 /*
   2  * Copyright (C) 2007 Krzysztof Halasa <khc@pm.waw.pl>
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of version 2 of the GNU General Public License
   6  * as published by the Free Software Foundation.
   7  */
   8
   9 #ifndef IXP4XX_QMGR_H
  10 #define IXP4XX_QMGR_H
  11
  12 #include <linux/io.h>
  13 #include <linux/kernel.h>
  14
  15 #define DEBUG_QMGR      0
  16
  17 #define HALF_QUEUES     32
  18 #define QUEUES          64
  19 #define MAX_QUEUE_LENGTH 4      /* in dwords */
  20
  21 #define QUEUE_STAT1_EMPTY               1 /* queue status bits */
  22 #define QUEUE_STAT1_NEARLY_EMPTY        2
  23 #define QUEUE_STAT1_NEARLY_FULL         4
  24 #define QUEUE_STAT1_FULL                8
  25 #define QUEUE_STAT2_UNDERFLOW           1
  26 #define QUEUE_STAT2_OVERFLOW            2
  27
  28 #define QUEUE_WATERMARK_0_ENTRIES       0
  29 #define QUEUE_WATERMARK_1_ENTRY         1
  30 #define QUEUE_WATERMARK_2_ENTRIES       2
  31 #define QUEUE_WATERMARK_4_ENTRIES       3
  32 #define QUEUE_WATERMARK_8_ENTRIES       4
  33 #define QUEUE_WATERMARK_16_ENTRIES      5
  34 #define QUEUE_WATERMARK_32_ENTRIES      6
  35 #define QUEUE_WATERMARK_64_ENTRIES      7
  36
  37 /* queue interrupt request conditions */
  38 #define QUEUE_IRQ_SRC_EMPTY             0
  39 #define QUEUE_IRQ_SRC_NEARLY_EMPTY      1
  40 #define QUEUE_IRQ_SRC_NEARLY_FULL       2
  41 #define QUEUE_IRQ_SRC_FULL              3
  42 #define QUEUE_IRQ_SRC_NOT_EMPTY         4
  43 #define QUEUE_IRQ_SRC_NOT_NEARLY_EMPTY  5
  44 #define QUEUE_IRQ_SRC_NOT_NEARLY_FULL   6
  45 #define QUEUE_IRQ_SRC_NOT_FULL          7
  46
  47 struct qmgr_regs {
  48         u32 acc[QUEUES][MAX_QUEUE_LENGTH]; /* 0x000 - 0x3FF */
  49         u32 stat1[4];           /* 0x400 - 0x40F */
  50         u32 stat2[2];           /* 0x410 - 0x417 */
  51         u32 statne_h;           /* 0x418 - queue nearly empty */
  52         u32 statf_h;            /* 0x41C - queue full */
  53         u32 irqsrc[4];          /* 0x420 - 0x42F IRC source */
  54         u32 irqen[2];           /* 0x430 - 0x437 IRQ enabled */
  55         u32 irqstat[2];         /* 0x438 - 0x43F - IRQ access only */
  56         u32 reserved[1776];
  57         u32 sram[2048];         /* 0x2000 - 0x3FFF - config and buffer */
  58 };
  59
  60 void qmgr_put_entry(unsigned int queue, u32 val);
  61 u32 qmgr_get_entry(unsigned int queue);
  62 int qmgr_stat_empty(unsigned int queue);
  63 int qmgr_stat_below_low_watermark(unsigned int queue);
  64 int qmgr_stat_full(unsigned int queue);
  65 int qmgr_stat_overflow(unsigned int queue);
  66 void qmgr_release_queue(unsigned int queue);
  67 void qmgr_set_irq(unsigned int queue, int src,
  68                   void (*handler)(void *pdev), void *pdev);
  69 void qmgr_enable_irq(unsigned int queue);
  70 void qmgr_disable_irq(unsigned int queue);
  71
  72 /* request_ and release_queue() must be called from non-IRQ context */
  73
  74 #if DEBUG_QMGR
  75 extern char qmgr_queue_descs[QUEUES][32];
  76
  77 int qmgr_request_queue(unsigned int queue, unsigned int len /* dwords */,
  78                        unsigned int nearly_empty_watermark,
  79                        unsigned int nearly_full_watermark,
  80                        const char *desc_format, const char* name);
  81 #else
  82 int __qmgr_request_queue(unsigned int queue, unsigned int len /* dwords */,
  83                          unsigned int nearly_empty_watermark,
  84                          unsigned int nearly_full_watermark);
  85 #define qmgr_request_queue(queue, len, nearly_empty_watermark,          \
  86                            nearly_full_watermark, desc_format, name)    \
  87         __qmgr_request_queue(queue, len, nearly_empty_watermark,        \
  88                              nearly_full_watermark)
  89 #endif
  90
  91 #endif