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

INCLUDED FROM

   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 
  44 struct 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 
  57 void qmgr_put_entry(unsigned int queue, u32 val);
  58 u32 qmgr_get_entry(unsigned int queue);
  59 int qmgr_stat_empty(unsigned int queue);
  60 int qmgr_stat_below_low_watermark(unsigned int queue);
  61 int qmgr_stat_full(unsigned int queue);
  62 int qmgr_stat_overflow(unsigned int queue);
  63 void qmgr_release_queue(unsigned int queue);
  64 void qmgr_set_irq(unsigned int queue, int src,
  65                   void (*handler)(void *pdev), void *pdev);
  66 void qmgr_enable_irq(unsigned int queue);
  67 void qmgr_disable_irq(unsigned int queue);
  68 
  69 /* request_ and release_queue() must be called from non-IRQ context */
  70 
  71 #if DEBUG_QMGR
  72 extern char qmgr_queue_descs[QUEUES][32];
  73 
  74 int 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
  79 int __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