sound/soc/fsl/fsl_ssi_dbg.c

   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
  19 void 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  */
 102 static 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
 131 static 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
 136 static 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
 143 int 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
 160 void 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 }