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 & 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 */
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, &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
159void 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