LXR linux/sound/soc/fsl/fsl_ssi

   1/*
   2 * Freescale SSI ALSA SoC Digital Audio Interface (DAI) debugging functions
   3 *
   4 * Copyright 2014 Markus Pargmann <mpa@pengutronix.de>, Pengutronix
   5 *
   6 * Splitted from fsl_ssi.c
   7 *
   8 * This file is licensed under the terms of the GNU General Public License
   9 * version 2.  This program is licensed "as is" without any warranty of any
  10 * kind, whether express or implied.
  11 */
  12
  13#include <linux/debugfs.h>
  14#include <linux/device.h>
  15#include <linux/kernel.h>
  16
  17#include "fsl_ssi.h"
  18
  19void fsl_ssi_dbg_isr(struct fsl_ssi_dbg *dbg, u32 sisr)
  20{
  21        if (sisr & SSI_SISR_RFRC)
  22                dbg->stats.rfrc++;
  23
  24        if (sisr & SSI_SISR_TFRC)
  25                dbg->stats.tfrc++;
  26
  27        if (sisr & SSI_SISR_CMDAU)
  28                dbg->stats.cmdau++;
  29
  30        if (sisr & SSI_SISR_CMDDU)
  31                dbg->stats.cmddu++;
  32
  33        if (sisr & SSI_SISR_RXT)
  34                dbg->stats.rxt++;
  35
  36        if (sisr & SSI_SISR_RDR1)
  37                dbg->stats.rdr1++;
  38
  39        if (sisr & SSI_SISR_RDR0)
  40                dbg->stats.rdr0++;
  41
  42        if (sisr & SSI_SISR_TDE1)
  43                dbg->stats.tde1++;
  44
  45        if (sisr & SSI_SISR_TDE0)
  46                dbg->stats.tde0++;
  47
  48        if (sisr & SSI_SISR_ROE1)
  49                dbg->stats.roe1++;
  50
  51        if (sisr & SSI_SISR_ROE0)
  52                dbg->stats.roe0++;
  53
  54        if (sisr & SSI_SISR_TUE1)
  55                dbg->stats.tue1++;
  56
  57        if (sisr & SSI_SISR_TUE0)
  58                dbg->stats.tue0++;
  59
  60        if (sisr & SSI_SISR_TFS)
  61                dbg->stats.tfs++;
  62
  63        if (sisr & SSI_SISR_RFS)
  64                dbg->stats.rfs++;
  65
  66        if (sisr & SSI_SISR_TLS)
  67                dbg->stats.tls++;
  68
  69        if (sisr & SSI_SISR_RLS)
  70                dbg->stats.rls++;
  71
  72        if (sisr & SSI_SISR_RFF1)
  73                dbg->stats.rff1++;
  74
  75        if (sisr & SSI_SISR_RFF0)
  76                dbg->stats.rff0++;
  77
  78        if (sisr & SSI_SISR_TFE1)
  79                dbg->stats.tfe1++;
  80
  81        if (sisr & SSI_SISR_TFE0)
  82                dbg->stats.tfe0++;
  83}
  84
  85/**
  86 * Show the statistics of a flag only if its interrupt is enabled
  87 *
  88 * Compilers will optimize it to a no-op if the interrupt is disabled
  89 */
  90#define SIER_SHOW(flag, name) \
  91        do { \
  92                if (SSI_SIER_##flag) \
  93                        seq_printf(s, #name "=%u\n", ssi_dbg->stats.name); \
  94        } while (0)
  95
  96
  97/**
  98 * Display the statistics for the current SSI device
  99 *
 100 * To avoid confusion, only show those counts that are enabled
 101 */
 102static int fsl_ssi_stats_show(struct seq_file *s, void *unused)
 103{
 104        struct fsl_ssi_dbg *ssi_dbg = s->private;
 105
 106        SIER_SHOW(RFRC_EN, rfrc);
 107        SIER_SHOW(TFRC_EN, tfrc);
 108        SIER_SHOW(CMDAU_EN, cmdau);
 109        SIER_SHOW(CMDDU_EN, cmddu);
 110        SIER_SHOW(RXT_EN, rxt);
 111        SIER_SHOW(RDR1_EN, rdr1);
 112        SIER_SHOW(RDR0_EN, rdr0);
 113        SIER_SHOW(TDE1_EN, tde1);
 114        SIER_SHOW(TDE0_EN, tde0);
 115        SIER_SHOW(ROE1_EN, roe1);
 116        SIER_SHOW(ROE0_EN, roe0);
 117        SIER_SHOW(TUE1_EN, tue1);
 118        SIER_SHOW(TUE0_EN, tue0);
 119        SIER_SHOW(TFS_EN, tfs);
 120        SIER_SHOW(RFS_EN, rfs);
 121        SIER_SHOW(TLS_EN, tls);
 122        SIER_SHOW(RLS_EN, rls);
 123        SIER_SHOW(RFF1_EN, rff1);
 124        SIER_SHOW(RFF0_EN, rff0);
 125        SIER_SHOW(TFE1_EN, tfe1);
 126        SIER_SHOW(TFE0_EN, tfe0);
 127
 128        return 0;
 129}
 130
 131static int fsl_ssi_stats_open(struct inode *inode, struct file *file)
 132{
 133        return single_open(file, fsl_ssi_stats_show, inode->i_private);
 134}
 135
 136static const struct file_operations fsl_ssi_stats_ops = {
 137        .open = fsl_ssi_stats_open,
 138        .read = seq_read,
 139        .llseek = seq_lseek,
 140        .release = single_release,
 141};
 142
 143int fsl_ssi_debugfs_create(struct fsl_ssi_dbg *ssi_dbg, struct device *dev)
 144{
 145        ssi_dbg->dbg_dir = debugfs_create_dir(dev_name(dev), NULL);
 146        if (!ssi_dbg->dbg_dir)
 147                return -ENOMEM;
 148
 149        ssi_dbg->dbg_stats = debugfs_create_file("stats", S_IRUGO,
 150                                                 ssi_dbg->dbg_dir, ssi_dbg,
 151                                                 &fsl_ssi_stats_ops);
 152        if (!ssi_dbg->dbg_stats) {
 153                debugfs_remove(ssi_dbg->dbg_dir);
 154                return -ENOMEM;
 155        }
 156
 157        return 0;
 158}
 159
 160void fsl_ssi_debugfs_remove(struct fsl_ssi_dbg *ssi_dbg)
 161{
 162        debugfs_remove(ssi_dbg->dbg_stats);
 163        debugfs_remove(ssi_dbg->dbg_dir);
 164}
 165