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ASoC: fsl-ssi: Move sysfs stats to debugfs 

Interrupt statistics of fsl_ssi are mainly for debugging purpose. Most
of those interrupts show error states, e.g. under/overflow.
The stats should be exposed via debugfs instead of sysfs.

This patch moves the statistics file to debugfs.

Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Markus Pargmann 2013-12-20 14:11:29 +01:00 committed by Mark Brown
parent 2841be9afa
commit 9368acc438
1 changed files with 117 additions and 67 deletions
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184
sound/soc/fsl/fsl_ssi.c
View File

@ -35,6 +35,7 @@
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/clk.h>
#include <linux/debugfs.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/slab.h>
@ -114,6 +115,14 @@ static inline void write_ssi_mask(u32 __iomem *addr, u32 clear, u32 set)
CCSR_SSI_SIER_RDMAE | CCSR_SSI_SIER_RIE | \
CCSR_SSI_SIER_ROE0_EN | CCSR_SSI_SIER_ROE1_EN)
#define FSLSSI_SIER_DBG_RX_FLAGS (CCSR_SSI_SIER_RFF0_EN | \
CCSR_SSI_SIER_RLS_EN | CCSR_SSI_SIER_RFS_EN | \
CCSR_SSI_SIER_ROE0_EN | CCSR_SSI_SIER_RFRC_EN)
#define FSLSSI_SIER_DBG_TX_FLAGS (CCSR_SSI_SIER_TFE0_EN | \
CCSR_SSI_SIER_TLS_EN | CCSR_SSI_SIER_TFS_EN | \
CCSR_SSI_SIER_TUE0_EN | CCSR_SSI_SIER_TFRC_EN)
#define FSLSSI_SISR_MASK (FSLSSI_SIER_DBG_RX_FLAGS | FSLSSI_SIER_DBG_TX_FLAGS)
/**
* fsl_ssi_private: per-SSI private data
*
@ -133,7 +142,6 @@ struct fsl_ssi_private {
unsigned int irq;
unsigned int fifo_depth;
struct snd_soc_dai_driver cpu_dai_drv;
struct device_attribute dev_attr;
struct platform_device *pdev;
bool new_binding;
@ -175,6 +183,8 @@ struct fsl_ssi_private {
unsigned int tfe1;
unsigned int tfe0;
} stats;
struct dentry *dbg_dir;
struct dentry *dbg_stats;
char name[1];
};
@ -203,7 +213,7 @@ static irqreturn_t fsl_ssi_isr(int irq, void *dev_id)
were interrupted for. We mask it with the Interrupt Enable register
so that we only check for events that we're interested in.
*/
sisr = read_ssi(&ssi->sisr) & SIER_FLAGS;
sisr = read_ssi(&ssi->sisr) & FSLSSI_SISR_MASK;
if (sisr & CCSR_SSI_SISR_RFRC) {
ssi_private->stats.rfrc++;
@ -323,6 +333,102 @@ static irqreturn_t fsl_ssi_isr(int irq, void *dev_id)
return ret;
}
#if IS_ENABLED(CONFIG_DEBUG_FS)
/* Show the statistics of a flag only if its interrupt is enabled. The
* compiler will optimze this code to a no-op if the interrupt is not
* enabled.
*/
#define SIER_SHOW(flag, name) \
do { \
if (FSLSSI_SISR_MASK & CCSR_SSI_SIER_##flag) \
seq_printf(s, #name "=%u\n", ssi_private->stats.name); \
} while (0)
/**
* fsl_sysfs_ssi_show: display SSI statistics
*
* Display the statistics for the current SSI device. To avoid confusion,
* we only show those counts that are enabled.
*/
static ssize_t fsl_ssi_stats_show(struct seq_file *s, void *unused)
{
struct fsl_ssi_private *ssi_private = s->private;
SIER_SHOW(RFRC_EN, rfrc);
SIER_SHOW(TFRC_EN, tfrc);
SIER_SHOW(CMDAU_EN, cmdau);
SIER_SHOW(CMDDU_EN, cmddu);
SIER_SHOW(RXT_EN, rxt);
SIER_SHOW(RDR1_EN, rdr1);
SIER_SHOW(RDR0_EN, rdr0);
SIER_SHOW(TDE1_EN, tde1);
SIER_SHOW(TDE0_EN, tde0);
SIER_SHOW(ROE1_EN, roe1);
SIER_SHOW(ROE0_EN, roe0);
SIER_SHOW(TUE1_EN, tue1);
SIER_SHOW(TUE0_EN, tue0);
SIER_SHOW(TFS_EN, tfs);
SIER_SHOW(RFS_EN, rfs);
SIER_SHOW(TLS_EN, tls);
SIER_SHOW(RLS_EN, rls);
SIER_SHOW(RFF1_EN, rff1);
SIER_SHOW(RFF0_EN, rff0);
SIER_SHOW(TFE1_EN, tfe1);
SIER_SHOW(TFE0_EN, tfe0);
return 0;
}
static int fsl_ssi_stats_open(struct inode *inode, struct file *file)
{
return single_open(file, fsl_ssi_stats_show, inode->i_private);
}
static const struct file_operations fsl_ssi_stats_ops = {
.open = fsl_ssi_stats_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int fsl_ssi_debugfs_create(struct fsl_ssi_private *ssi_private,
struct device *dev)
{
ssi_private->dbg_dir = debugfs_create_dir(dev_name(dev), NULL);
if (!ssi_private->dbg_dir)
return -ENOMEM;
ssi_private->dbg_stats = debugfs_create_file("stats", S_IRUGO,
ssi_private->dbg_dir, ssi_private, &fsl_ssi_stats_ops);
if (!ssi_private->dbg_stats) {
debugfs_remove(ssi_private->dbg_dir);
return -ENOMEM;
}
return 0;
}
static void fsl_ssi_debugfs_remove(struct fsl_ssi_private *ssi_private)
{
debugfs_remove(ssi_private->dbg_stats);
debugfs_remove(ssi_private->dbg_dir);
}
#else
static int fsl_ssi_debugfs_create(struct fsl_ssi_private *ssi_private,
struct device *dev)
{
return 0;
}
static void fsl_ssi_debugfs_remove(struct fsl_ssi_private *ssi_private)
{
}
#endif /* IS_ENABLED(CONFIG_DEBUG_FS) */
static void fsl_ssi_setup_ac97(struct fsl_ssi_private *ssi_private)
{
struct ccsr_ssi __iomem *ssi = ssi_private->ssi;
@ -991,56 +1097,6 @@ static struct snd_ac97_bus_ops fsl_ssi_ac97_ops = {
.write = fsl_ssi_ac97_write,
};
/* Show the statistics of a flag only if its interrupt is enabled. The
* compiler will optimze this code to a no-op if the interrupt is not
* enabled.
*/
#define SIER_SHOW(flag, name) \
do { \
if (SIER_FLAGS & CCSR_SSI_SIER_##flag) \
length += sprintf(buf + length, #name "=%u\n", \
ssi_private->stats.name); \
} while (0)
/**
* fsl_sysfs_ssi_show: display SSI statistics
*
* Display the statistics for the current SSI device. To avoid confusion,
* we only show those counts that are enabled.
*/
static ssize_t fsl_sysfs_ssi_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct fsl_ssi_private *ssi_private =
container_of(attr, struct fsl_ssi_private, dev_attr);
ssize_t length = 0;
SIER_SHOW(RFRC_EN, rfrc);
SIER_SHOW(TFRC_EN, tfrc);
SIER_SHOW(CMDAU_EN, cmdau);
SIER_SHOW(CMDDU_EN, cmddu);
SIER_SHOW(RXT_EN, rxt);
SIER_SHOW(RDR1_EN, rdr1);
SIER_SHOW(RDR0_EN, rdr0);
SIER_SHOW(TDE1_EN, tde1);
SIER_SHOW(TDE0_EN, tde0);
SIER_SHOW(ROE1_EN, roe1);
SIER_SHOW(ROE0_EN, roe0);
SIER_SHOW(TUE1_EN, tue1);
SIER_SHOW(TUE0_EN, tue0);
SIER_SHOW(TFS_EN, tfs);
SIER_SHOW(RFS_EN, rfs);
SIER_SHOW(TLS_EN, tls);
SIER_SHOW(RLS_EN, rls);
SIER_SHOW(RFF1_EN, rff1);
SIER_SHOW(RFF0_EN, rff0);
SIER_SHOW(TFE1_EN, tfe1);
SIER_SHOW(TFE0_EN, tfe0);
return length;
}
/**
* Make every character in a string lower-case
*/
@ -1233,20 +1289,6 @@ static int fsl_ssi_probe(struct platform_device *pdev)
}
}
/* Initialize the the device_attribute structure */
dev_attr = &ssi_private->dev_attr;
sysfs_attr_init(&dev_attr->attr);
dev_attr->attr.name = "statistics";
dev_attr->attr.mode = S_IRUGO;
dev_attr->show = fsl_sysfs_ssi_show;
ret = device_create_file(&pdev->dev, dev_attr);
if (ret) {
dev_err(&pdev->dev, "could not create sysfs %s file\n",
ssi_private->dev_attr.attr.name);
goto error_clk;
}
/* Register with ASoC */
dev_set_drvdata(&pdev->dev, ssi_private);
@ -1257,6 +1299,10 @@ static int fsl_ssi_probe(struct platform_device *pdev)
goto error_dev;
}
ret = fsl_ssi_debugfs_create(ssi_private, &pdev->dev);
if (ret)
goto error_dbgfs;
if (ssi_private->ssi_on_imx) {
if (!ssi_private->use_dma) {
@ -1326,6 +1372,9 @@ error_dai:
imx_pcm_fiq_exit(pdev);
error_pcm:
fsl_ssi_debugfs_remove(ssi_private);
error_dbgfs:
snd_soc_unregister_component(&pdev->dev);
error_dev:
@ -1349,10 +1398,11 @@ static int fsl_ssi_remove(struct platform_device *pdev)
{
struct fsl_ssi_private *ssi_private = dev_get_drvdata(&pdev->dev);
fsl_ssi_debugfs_remove(ssi_private);
if (!ssi_private->new_binding)
platform_device_unregister(ssi_private->pdev);
snd_soc_unregister_component(&pdev->dev);
device_remove_file(&pdev->dev, &ssi_private->dev_attr);
if (ssi_private->ssi_on_imx) {
if (!IS_ERR(ssi_private->baudclk))
clk_disable_unprepare(ssi_private->baudclk);