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Linux/sound/soc/fsl/fsl_ssi_dbg.c

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  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 & CCSR_SSI_SISR_RFRC)
 22                 dbg->stats.rfrc++;
 23 
 24         if (sisr & CCSR_SSI_SISR_TFRC)
 25                 dbg->stats.tfrc++;
 26 
 27         if (sisr & CCSR_SSI_SISR_CMDAU)
 28                 dbg->stats.cmdau++;
 29 
 30         if (sisr & CCSR_SSI_SISR_CMDDU)
 31                 dbg->stats.cmddu++;
 32 
 33         if (sisr & CCSR_SSI_SISR_RXT)
 34                 dbg->stats.rxt++;
 35 
 36         if (sisr & CCSR_SSI_SISR_RDR1)
 37                 dbg->stats.rdr1++;
 38 
 39         if (sisr & CCSR_SSI_SISR_RDR0)
 40                 dbg->stats.rdr0++;
 41 
 42         if (sisr & CCSR_SSI_SISR_TDE1)
 43                 dbg->stats.tde1++;
 44 
 45         if (sisr & CCSR_SSI_SISR_TDE0)
 46                 dbg->stats.tde0++;
 47 
 48         if (sisr & CCSR_SSI_SISR_ROE1)
 49                 dbg->stats.roe1++;
 50 
 51         if (sisr & CCSR_SSI_SISR_ROE0)
 52                 dbg->stats.roe0++;
 53 
 54         if (sisr & CCSR_SSI_SISR_TUE1)
 55                 dbg->stats.tue1++;
 56 
 57         if (sisr & CCSR_SSI_SISR_TUE0)
 58                 dbg->stats.tue0++;
 59 
 60         if (sisr & CCSR_SSI_SISR_TFS)
 61                 dbg->stats.tfs++;
 62 
 63         if (sisr & CCSR_SSI_SISR_RFS)
 64                 dbg->stats.rfs++;
 65 
 66         if (sisr & CCSR_SSI_SISR_TLS)
 67                 dbg->stats.tls++;
 68 
 69         if (sisr & CCSR_SSI_SISR_RLS)
 70                 dbg->stats.rls++;
 71 
 72         if (sisr & CCSR_SSI_SISR_RFF1)
 73                 dbg->stats.rff1++;
 74 
 75         if (sisr & CCSR_SSI_SISR_RFF0)
 76                 dbg->stats.rff0++;
 77 
 78         if (sisr & CCSR_SSI_SISR_TFE1)
 79                 dbg->stats.tfe1++;
 80 
 81         if (sisr & CCSR_SSI_SISR_TFE0)
 82                 dbg->stats.tfe0++;
 83 }
 84 
 85 /* Show the statistics of a flag only if its interrupt is enabled.  The
 86  * compiler will optimze this code to a no-op if the interrupt is not
 87  * enabled.
 88  */
 89 #define SIER_SHOW(flag, name) \
 90         do { \
 91                 if (CCSR_SSI_SIER_##flag) \
 92                         seq_printf(s, #name "=%u\n", ssi_dbg->stats.name); \
 93         } while (0)
 94 
 95 
 96 /**
 97  * fsl_sysfs_ssi_show: display SSI statistics
 98  *
 99  * Display the statistics for the current SSI device.  To avoid confusion,
100  * we 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, &fsl_ssi_stats_ops);
151         if (!ssi_dbg->dbg_stats) {
152                 debugfs_remove(ssi_dbg->dbg_dir);
153                 return -ENOMEM;
154         }
155 
156         return 0;
157 }
158 
159 void fsl_ssi_debugfs_remove(struct fsl_ssi_dbg *ssi_dbg)
160 {
161         debugfs_remove(ssi_dbg->dbg_stats);
162         debugfs_remove(ssi_dbg->dbg_dir);
163 }
164 

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