debugfs files to show the contents of important dsps registers.
Signed-off-by: Markus Pargmann <m...@pengutronix.de>
---
drivers/usb/musb/musb_dsps.c | 89 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 89 insertions(+)
diff --git a/drivers/usb/musb/musb_dsps.c b/drivers/usb/musb/musb_dsps.c
index 189e52c..b24b697 100644
--- a/drivers/usb/musb/musb_dsps.c
+++ b/drivers/usb/musb/musb_dsps.c
@@ -46,6 +46,8 @@
#include <linux/of_irq.h>
#include <linux/usb/of.h>
+#include <linux/debugfs.h>
+
#include "musb_core.h"
static const struct of_device_id musb_dsps_of_match[];
@@ -121,6 +123,61 @@ struct dsps_glue {
unsigned long last_timer; /* last timer data for each instance */
};
+#if IS_ENABLED(CONFIG_DEBUG_FS)
+
+struct musb_register_map {
+ char *name;
+ unsigned offset;
+};
+
+static const struct musb_register_map musb_regmap[] = {
+ { "revision", 0x00 },
+ { "control", 0x14 },
+ { "status", 0x18 },
+ { "eoi", 0x24 },
+ { "intr0_stat", 0x30 },
+ { "intr1_stat", 0x34 },
+ { "intr0_set", 0x38 },
+ { "intr1_set", 0x3c },
+ { "txmode", 0x70 },
+ { "rxmode", 0x74 },
+ { "autoreq", 0xd0 },
+ { "srpfixtime", 0xd4 },
+ { "tdown", 0xd8 },
+ { "phy_utmi", 0xe0 },
+ { "mode", 0xe8 },
+ { } /* Terminating Entry */
+};
+
+static int musb_regdump_show(struct seq_file *s, void *unused)
+{
+ struct musb *musb = s->private;
+ unsigned i;
+
+ seq_puts(s, "MUSB (M)HDRC dsps Register Dump\n");
+
+ for (i = 0; i < ARRAY_SIZE(musb_regmap); i++) {
+ u32 val = musb_readl(musb->ctrl_base, musb_regmap[i].offset);
+ seq_printf(s, "%-12s: %08x\n", musb_regmap[i].name, val);
+ }
+
+ return 0;
+}
+
+static int musb_regdump_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, musb_regdump_show, inode->i_private);
+}
+
+static const struct file_operations musb_regdump_fops = {
+ .open = musb_regdump_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+#endif /* IS_ENABLED(CONFIG_DEBUG_FS) */
+
/**
* dsps_musb_enable - enable interrupts
*/
@@ -348,6 +405,31 @@ out:
return ret;
}
+#if IS_ENABLED(CONFIG_DEBUG_FS)
+static int dsps_musb_dbg_init(struct musb *musb)
+{
+ struct dentry *root;
+ struct dentry *file;
+ char buf[128];
+
+ sprintf(buf, "%s.dsps", dev_name(musb->controller));
+ root = debugfs_create_dir(buf, NULL);
+ if (!root)
+ return -ENOMEM;
+
+ file = debugfs_create_file("regdump", S_IRUGO, root, musb,
+ &musb_regdump_fops);
+ if (!file)
+ return -ENOMEM;
+ return 0;
+}
+#else
+static int dsps_musb_dbg_init(struct musb *musb)
+{
+ return 0;
+}
+#endif
+
static int dsps_musb_init(struct musb *musb)
{
struct device *dev = musb->controller;
@@ -357,6 +439,7 @@ static int dsps_musb_init(struct musb *musb)
void __iomem *reg_base;
struct resource *r;
u32 rev, val;
+ int ret;
r = platform_get_resource_byname(parent, IORESOURCE_MEM, "control");
if (!r)
@@ -390,6 +473,12 @@ static int dsps_musb_init(struct musb *musb)
val &= ~(1 << wrp->otg_disable);
dsps_writel(musb->ctrl_base, wrp->phy_utmi, val);
+ ret = dsps_musb_dbg_init(musb);
+ if (ret)
+ return ret;
+
+ dev_info(dev, "%s:%d %s: OK\n", __FILE__, __LINE__, __func__);
+
return 0;
}
--
1.8.4.rc3
--
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