1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // Freescale SSI ALSA SoC Digital Audio Interface (DAI) debugging functions
4 //
5 // Copyright 2014 Markus Pargmann <mpa@pengutronix.de>, Pengutronix
6 //
7 // Split from fsl_ssi.c
8
9 #include <linux/debugfs.h>
10 #include <linux/device.h>
11 #include <linux/kernel.h>
12
13 #include "fsl_ssi.h"
14
fsl_ssi_dbg_isr(struct fsl_ssi_dbg * dbg,u32 sisr)15 void fsl_ssi_dbg_isr(struct fsl_ssi_dbg *dbg, u32 sisr)
16 {
17 if (sisr & SSI_SISR_RFRC)
18 dbg->stats.rfrc++;
19
20 if (sisr & SSI_SISR_TFRC)
21 dbg->stats.tfrc++;
22
23 if (sisr & SSI_SISR_CMDAU)
24 dbg->stats.cmdau++;
25
26 if (sisr & SSI_SISR_CMDDU)
27 dbg->stats.cmddu++;
28
29 if (sisr & SSI_SISR_RXT)
30 dbg->stats.rxt++;
31
32 if (sisr & SSI_SISR_RDR1)
33 dbg->stats.rdr1++;
34
35 if (sisr & SSI_SISR_RDR0)
36 dbg->stats.rdr0++;
37
38 if (sisr & SSI_SISR_TDE1)
39 dbg->stats.tde1++;
40
41 if (sisr & SSI_SISR_TDE0)
42 dbg->stats.tde0++;
43
44 if (sisr & SSI_SISR_ROE1)
45 dbg->stats.roe1++;
46
47 if (sisr & SSI_SISR_ROE0)
48 dbg->stats.roe0++;
49
50 if (sisr & SSI_SISR_TUE1)
51 dbg->stats.tue1++;
52
53 if (sisr & SSI_SISR_TUE0)
54 dbg->stats.tue0++;
55
56 if (sisr & SSI_SISR_TFS)
57 dbg->stats.tfs++;
58
59 if (sisr & SSI_SISR_RFS)
60 dbg->stats.rfs++;
61
62 if (sisr & SSI_SISR_TLS)
63 dbg->stats.tls++;
64
65 if (sisr & SSI_SISR_RLS)
66 dbg->stats.rls++;
67
68 if (sisr & SSI_SISR_RFF1)
69 dbg->stats.rff1++;
70
71 if (sisr & SSI_SISR_RFF0)
72 dbg->stats.rff0++;
73
74 if (sisr & SSI_SISR_TFE1)
75 dbg->stats.tfe1++;
76
77 if (sisr & SSI_SISR_TFE0)
78 dbg->stats.tfe0++;
79 }
80
81 /**
82 * Show the statistics of a flag only if its interrupt is enabled
83 *
84 * Compilers will optimize it to a no-op if the interrupt is disabled
85 */
86 #define SIER_SHOW(flag, name) \
87 do { \
88 if (SSI_SIER_##flag) \
89 seq_printf(s, #name "=%u\n", ssi_dbg->stats.name); \
90 } while (0)
91
92
93 /**
94 * Display the statistics for the current SSI device
95 *
96 * To avoid confusion, only show those counts that are enabled
97 */
fsl_ssi_stats_show(struct seq_file * s,void * unused)98 static int fsl_ssi_stats_show(struct seq_file *s, void *unused)
99 {
100 struct fsl_ssi_dbg *ssi_dbg = s->private;
101
102 SIER_SHOW(RFRC_EN, rfrc);
103 SIER_SHOW(TFRC_EN, tfrc);
104 SIER_SHOW(CMDAU_EN, cmdau);
105 SIER_SHOW(CMDDU_EN, cmddu);
106 SIER_SHOW(RXT_EN, rxt);
107 SIER_SHOW(RDR1_EN, rdr1);
108 SIER_SHOW(RDR0_EN, rdr0);
109 SIER_SHOW(TDE1_EN, tde1);
110 SIER_SHOW(TDE0_EN, tde0);
111 SIER_SHOW(ROE1_EN, roe1);
112 SIER_SHOW(ROE0_EN, roe0);
113 SIER_SHOW(TUE1_EN, tue1);
114 SIER_SHOW(TUE0_EN, tue0);
115 SIER_SHOW(TFS_EN, tfs);
116 SIER_SHOW(RFS_EN, rfs);
117 SIER_SHOW(TLS_EN, tls);
118 SIER_SHOW(RLS_EN, rls);
119 SIER_SHOW(RFF1_EN, rff1);
120 SIER_SHOW(RFF0_EN, rff0);
121 SIER_SHOW(TFE1_EN, tfe1);
122 SIER_SHOW(TFE0_EN, tfe0);
123
124 return 0;
125 }
126
fsl_ssi_stats_open(struct inode * inode,struct file * file)127 static int fsl_ssi_stats_open(struct inode *inode, struct file *file)
128 {
129 return single_open(file, fsl_ssi_stats_show, inode->i_private);
130 }
131
132 static const struct file_operations fsl_ssi_stats_ops = {
133 .open = fsl_ssi_stats_open,
134 .read = seq_read,
135 .llseek = seq_lseek,
136 .release = single_release,
137 };
138
fsl_ssi_debugfs_create(struct fsl_ssi_dbg * ssi_dbg,struct device * dev)139 int fsl_ssi_debugfs_create(struct fsl_ssi_dbg *ssi_dbg, struct device *dev)
140 {
141 ssi_dbg->dbg_dir = debugfs_create_dir(dev_name(dev), NULL);
142 if (!ssi_dbg->dbg_dir)
143 return -ENOMEM;
144
145 ssi_dbg->dbg_stats = debugfs_create_file("stats", 0444,
146 ssi_dbg->dbg_dir, ssi_dbg,
147 &fsl_ssi_stats_ops);
148 if (!ssi_dbg->dbg_stats) {
149 debugfs_remove(ssi_dbg->dbg_dir);
150 return -ENOMEM;
151 }
152
153 return 0;
154 }
155
fsl_ssi_debugfs_remove(struct fsl_ssi_dbg * ssi_dbg)156 void fsl_ssi_debugfs_remove(struct fsl_ssi_dbg *ssi_dbg)
157 {
158 debugfs_remove(ssi_dbg->dbg_stats);
159 debugfs_remove(ssi_dbg->dbg_dir);
160 }
161
