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soundwire: intel: add debugfs register dump 

Add debugfs file to dump the Intel SoundWire registers

Credits: this patch is based on an earlier internal contribution by
Vinod Koul, Sanyog Kale, Shreyas Nc and Hardik Shah.

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Sanyog Kale <sanyog.r.kale@intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20190821185821.12690-4-pierre-louis.bossart@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
alistair/sunxi64-5.4-dsi
Pierre-Louis Bossart 2019-08-21 13:58:20 -05:00 committed by Vinod Koul
parent aa85066e5f
commit 79ee663126
1 changed files with 121 additions and 0 deletions
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121
drivers/soundwire/intel.c
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@ -6,6 +6,7 @@
*/
#include <linux/acpi.h>
#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/interrupt.h>
@ -16,6 +17,7 @@
#include <linux/soundwire/sdw.h>
#include <linux/soundwire/sdw_intel.h>
#include "cadence_master.h"
#include "bus.h"
#include "intel.h"
/* Intel SHIM Registers Definition */
@ -83,6 +85,7 @@
/* Intel ALH Register definitions */
#define SDW_ALH_STRMZCFG(x) (0x000 + (0x4 * (x)))
#define SDW_ALH_NUM_STREAMS 64
#define SDW_ALH_STRMZCFG_DMAT_VAL 0x3
#define SDW_ALH_STRMZCFG_DMAT GENMASK(7, 0)
@ -98,6 +101,9 @@ struct sdw_intel {
struct sdw_cdns cdns;
int instance;
struct sdw_intel_link_res *res;
#ifdef CONFIG_DEBUG_FS
struct dentry *debugfs;
#endif
};
#define cdns_to_intel(_cdns) container_of(_cdns, struct sdw_intel, cdns)
@ -161,6 +167,118 @@ static int intel_set_bit(void __iomem *base, int offset, u32 value, u32 mask)
return -EAGAIN;
}
/*
* debugfs
*/
#ifdef CONFIG_DEBUG_FS
#define RD_BUF (2 * PAGE_SIZE)
static ssize_t intel_sprintf(void __iomem *mem, bool l,
char *buf, size_t pos, unsigned int reg)
{
int value;
if (l)
value = intel_readl(mem, reg);
else
value = intel_readw(mem, reg);
return scnprintf(buf + pos, RD_BUF - pos, "%4x\t%4x\n", reg, value);
}
static int intel_reg_show(struct seq_file *s_file, void *data)
{
struct sdw_intel *sdw = s_file->private;
void __iomem *s = sdw->res->shim;
void __iomem *a = sdw->res->alh;
char *buf;
ssize_t ret;
int i, j;
unsigned int links, reg;
buf = kzalloc(RD_BUF, GFP_KERNEL);
if (!buf)
return -ENOMEM;
links = intel_readl(s, SDW_SHIM_LCAP) & GENMASK(2, 0);
ret = scnprintf(buf, RD_BUF, "Register Value\n");
ret += scnprintf(buf + ret, RD_BUF - ret, "\nShim\n");
for (i = 0; i < links; i++) {
reg = SDW_SHIM_LCAP + i * 4;
ret += intel_sprintf(s, true, buf, ret, reg);
}
for (i = 0; i < links; i++) {
ret += scnprintf(buf + ret, RD_BUF - ret, "\nLink%d\n", i);
ret += intel_sprintf(s, false, buf, ret, SDW_SHIM_CTLSCAP(i));
ret += intel_sprintf(s, false, buf, ret, SDW_SHIM_CTLS0CM(i));
ret += intel_sprintf(s, false, buf, ret, SDW_SHIM_CTLS1CM(i));
ret += intel_sprintf(s, false, buf, ret, SDW_SHIM_CTLS2CM(i));
ret += intel_sprintf(s, false, buf, ret, SDW_SHIM_CTLS3CM(i));
ret += intel_sprintf(s, false, buf, ret, SDW_SHIM_PCMSCAP(i));
ret += scnprintf(buf + ret, RD_BUF - ret, "\n PCMSyCH registers\n");
/*
* the value 10 is the number of PDIs. We will need a
* cleanup to remove hard-coded Intel configurations
* from cadence_master.c
*/
for (j = 0; j < 10; j++) {
ret += intel_sprintf(s, false, buf, ret,
SDW_SHIM_PCMSYCHM(i, j));
ret += intel_sprintf(s, false, buf, ret,
SDW_SHIM_PCMSYCHC(i, j));
}
ret += scnprintf(buf + ret, RD_BUF - ret, "\n PDMSCAP, IOCTL, CTMCTL\n");
ret += intel_sprintf(s, false, buf, ret, SDW_SHIM_PDMSCAP(i));
ret += intel_sprintf(s, false, buf, ret, SDW_SHIM_IOCTL(i));
ret += intel_sprintf(s, false, buf, ret, SDW_SHIM_CTMCTL(i));
}
ret += scnprintf(buf + ret, RD_BUF - ret, "\nWake registers\n");
ret += intel_sprintf(s, false, buf, ret, SDW_SHIM_WAKEEN);
ret += intel_sprintf(s, false, buf, ret, SDW_SHIM_WAKESTS);
ret += scnprintf(buf + ret, RD_BUF - ret, "\nALH STRMzCFG\n");
for (i = 0; i < SDW_ALH_NUM_STREAMS; i++)
ret += intel_sprintf(a, true, buf, ret, SDW_ALH_STRMZCFG(i));
seq_printf(s_file, "%s", buf);
kfree(buf);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(intel_reg);
static void intel_debugfs_init(struct sdw_intel *sdw)
{
struct dentry *root = sdw->cdns.bus.debugfs;
if (!root)
return;
sdw->debugfs = debugfs_create_dir("intel-sdw", root);
debugfs_create_file("intel-registers", 0400, sdw->debugfs, sdw,
&intel_reg_fops);
sdw_cdns_debugfs_init(&sdw->cdns, sdw->debugfs);
}
static void intel_debugfs_exit(struct sdw_intel *sdw)
{
debugfs_remove_recursive(sdw->debugfs);
}
#else
static void intel_debugfs_init(struct sdw_intel *sdw) {}
static void intel_debugfs_exit(struct sdw_intel *sdw) {}
#endif /* CONFIG_DEBUG_FS */
/*
* shim ops
*/
@ -935,6 +1053,8 @@ static int intel_probe(struct platform_device *pdev)
goto err_dai;
}
intel_debugfs_init(sdw);
return 0;
err_dai:
@ -951,6 +1071,7 @@ static int intel_remove(struct platform_device *pdev)
sdw = platform_get_drvdata(pdev);
intel_debugfs_exit(sdw);
free_irq(sdw->res->irq, sdw);
snd_soc_unregister_component(sdw->cdns.dev);
sdw_delete_bus_master(&sdw->cdns.bus);