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soundwire: cadence_master: add debugfs register dump 

Add debugfs file to dump the Cadence master 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/20190821185821.12690-3-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 13:58:19 -05:00 committed by Vinod Koul
parent bf03473d5b
commit aa85066e5f
2 changed files with 111 additions and 0 deletions
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107
drivers/soundwire/cadence_master.c
View File

@ -8,6 +8,7 @@
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/debugfs.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
@ -230,6 +231,112 @@ static int cdns_clear_bit(struct sdw_cdns *cdns, int offset, u32 value)
return -EAGAIN;
}
/*
* debugfs
*/
#ifdef CONFIG_DEBUG_FS
#define RD_BUF (2 * PAGE_SIZE)
static ssize_t cdns_sprintf(struct sdw_cdns *cdns,
char *buf, size_t pos, unsigned int reg)
{
return scnprintf(buf + pos, RD_BUF - pos,
"%4x\t%8x\n", reg, cdns_readl(cdns, reg));
}
static int cdns_reg_show(struct seq_file *s, void *data)
{
struct sdw_cdns *cdns = s->private;
char *buf;
ssize_t ret;
int num_ports;
int i, j;
buf = kzalloc(RD_BUF, GFP_KERNEL);
if (!buf)
return -ENOMEM;
ret = scnprintf(buf, RD_BUF, "Register Value\n");
ret += scnprintf(buf + ret, RD_BUF - ret, "\nMCP Registers\n");
/* 8 MCP registers */
for (i = CDNS_MCP_CONFIG; i <= CDNS_MCP_PHYCTRL; i += sizeof(u32))
ret += cdns_sprintf(cdns, buf, ret, i);
ret += scnprintf(buf + ret, RD_BUF - ret,
"\nStatus & Intr Registers\n");
/* 13 Status & Intr registers (offsets 0x70 and 0x74 not defined) */
for (i = CDNS_MCP_STAT; i <= CDNS_MCP_FIFOSTAT; i += sizeof(u32))
ret += cdns_sprintf(cdns, buf, ret, i);
ret += scnprintf(buf + ret, RD_BUF - ret,
"\nSSP & Clk ctrl Registers\n");
ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL0);
ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL1);
ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL0);
ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL1);
ret += scnprintf(buf + ret, RD_BUF - ret,
"\nDPn B0 Registers\n");
/*
* in sdw_cdns_pdi_init() we filter out the Bulk PDIs,
* so the indices need to be corrected again
*/
num_ports = cdns->num_ports + CDNS_PCM_PDI_OFFSET;
for (i = 0; i < num_ports; i++) {
ret += scnprintf(buf + ret, RD_BUF - ret,
"\nDP-%d\n", i);
for (j = CDNS_DPN_B0_CONFIG(i);
j < CDNS_DPN_B0_ASYNC_CTRL(i); j += sizeof(u32))
ret += cdns_sprintf(cdns, buf, ret, j);
}
ret += scnprintf(buf + ret, RD_BUF - ret,
"\nDPn B1 Registers\n");
for (i = 0; i < num_ports; i++) {
ret += scnprintf(buf + ret, RD_BUF - ret,
"\nDP-%d\n", i);
for (j = CDNS_DPN_B1_CONFIG(i);
j < CDNS_DPN_B1_ASYNC_CTRL(i); j += sizeof(u32))
ret += cdns_sprintf(cdns, buf, ret, j);
}
ret += scnprintf(buf + ret, RD_BUF - ret,
"\nDPn Control Registers\n");
for (i = 0; i < num_ports; i++)
ret += cdns_sprintf(cdns, buf, ret,
CDNS_PORTCTRL + i * CDNS_PORT_OFFSET);
ret += scnprintf(buf + ret, RD_BUF - ret,
"\nPDIn Config Registers\n");
/* number of PDI and ports is interchangeable */
for (i = 0; i < num_ports; i++)
ret += cdns_sprintf(cdns, buf, ret, CDNS_PDI_CONFIG(i));
seq_printf(s, "%s", buf);
kfree(buf);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(cdns_reg);
/**
* sdw_cdns_debugfs_init() - Cadence debugfs init
* @cdns: Cadence instance
* @root: debugfs root
*/
void sdw_cdns_debugfs_init(struct sdw_cdns *cdns, struct dentry *root)
{
debugfs_create_file("cdns-registers", 0400, root, cdns, &cdns_reg_fops);
}
EXPORT_SYMBOL_GPL(sdw_cdns_debugfs_init);
#endif /* CONFIG_DEBUG_FS */
/*
* IO Calls
*/

4
drivers/soundwire/cadence_master.h
View File

@ -163,6 +163,10 @@ int sdw_cdns_pdi_init(struct sdw_cdns *cdns,
struct sdw_cdns_stream_config config);
int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns);
#ifdef CONFIG_DEBUG_FS
void sdw_cdns_debugfs_init(struct sdw_cdns *cdns, struct dentry *root);
#endif
int sdw_cdns_get_stream(struct sdw_cdns *cdns,
struct sdw_cdns_streams *stream,
u32 ch, u32 dir);