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.
Signed-off-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com --- drivers/soundwire/cadence_master.c | 107 +++++++++++++++++++++++++++++ drivers/soundwire/cadence_master.h | 4 ++ 2 files changed, 111 insertions(+)
diff --git a/drivers/soundwire/cadence_master.c b/drivers/soundwire/cadence_master.c index 665632dbdeb5..051c3736994a 100644 --- a/drivers/soundwire/cadence_master.c +++ b/drivers/soundwire/cadence_master.c @@ -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> @@ -223,6 +224,112 @@ 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 */ diff --git a/drivers/soundwire/cadence_master.h b/drivers/soundwire/cadence_master.h index fe2af62958b1..2c0adf34e835 100644 --- a/drivers/soundwire/cadence_master.h +++ b/drivers/soundwire/cadence_master.h @@ -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);