Allow the contents of the scratch registers to be shown in debugfs.
Signed-off-by: Andrew Lunn <and...@lunn.ch>
---
drivers/net/dsa/mv88e6xxx.c | 54 +++++++++++++++++++++++++++++++++++++++++++++
drivers/net/dsa/mv88e6xxx.h | 3 +++
2 files changed, 57 insertions(+)
diff --git a/drivers/net/dsa/mv88e6xxx.c b/drivers/net/dsa/mv88e6xxx.c
index 7e12a31e9dae..c938d7ce5215 100644
--- a/drivers/net/dsa/mv88e6xxx.c
+++ b/drivers/net/dsa/mv88e6xxx.c
@@ -901,6 +901,13 @@ static int _mv88e6xxx_atu_wait(struct dsa_switch *ds)
GLOBAL_ATU_OP_BUSY);
}
+/* Must be called with SMI lock held */
+static int _mv88e6xxx_scratch_wait(struct dsa_switch *ds)
+{
+ return _mv88e6xxx_wait(ds, REG_GLOBAL2, GLOBAL2_SCRATCH_MISC,
+ GLOBAL2_SCRATCH_BUSY);
+}
+
/* Must be called with SMI mutex held */
static int _mv88e6xxx_phy_read_indirect(struct dsa_switch *ds, int addr,
int regnum)
@@ -1825,6 +1832,50 @@ static const struct file_operations
mv88e6xxx_device_map_fops = {
.owner = THIS_MODULE,
};
+static int mv88e6xxx_scratch_show(struct seq_file *s, void *p)
+{
+ struct dsa_switch *ds = s->private;
+ struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
+ int reg, ret;
+
+ seq_puts(s, "Register Value\n");
+
+ mutex_lock(&ps->smi_mutex);
+ for (reg = 0; reg < 0x80; reg++) {
+ ret = _mv88e6xxx_reg_write(
+ ds, REG_GLOBAL2, GLOBAL2_SCRATCH_MISC,
+ reg << GLOBAL2_SCRATCH_REGISTER_SHIFT);
+ if (ret < 0)
+ goto out;
+
+ ret = _mv88e6xxx_scratch_wait(ds);
+ if (ret < 0)
+ goto out;
+
+ ret = _mv88e6xxx_reg_read(ds, REG_GLOBAL2,
+ GLOBAL2_SCRATCH_MISC);
+ seq_printf(s, " %2x %2x\n", reg,
+ ret & GLOBAL2_SCRATCH_VALUE_MASK);
+ }
+out:
+ mutex_unlock(&ps->smi_mutex);
+
+ return 0;
+}
+
+static int mv88e6xxx_scratch_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, mv88e6xxx_scratch_show, inode->i_private);
+}
+
+static const struct file_operations mv88e6xxx_scratch_fops = {
+ .open = mv88e6xxx_scratch_open,
+ .read = seq_read,
+ .llseek = no_llseek,
+ .release = single_release,
+ .owner = THIS_MODULE,
+};
+
int mv88e6xxx_setup_common(struct dsa_switch *ds)
{
struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
@@ -1853,6 +1904,9 @@ int mv88e6xxx_setup_common(struct dsa_switch *ds)
debugfs_create_file("device_map", S_IRUGO, ps->dbgfs, ds,
&mv88e6xxx_device_map_fops);
+
+ debugfs_create_file("scratch", S_IRUGO, ps->dbgfs, ds,
+ &mv88e6xxx_scratch_fops);
return 0;
}
diff --git a/drivers/net/dsa/mv88e6xxx.h b/drivers/net/dsa/mv88e6xxx.h
index a2c9ac0c54ab..a650b2656de9 100644
--- a/drivers/net/dsa/mv88e6xxx.h
+++ b/drivers/net/dsa/mv88e6xxx.h
@@ -297,6 +297,9 @@
#define GLOBAL2_SMI_OP_45_READ_DATA ((2 << 10) | GLOBAL2_SMI_OP_BUSY)
#define GLOBAL2_SMI_DATA 0x19
#define GLOBAL2_SCRATCH_MISC 0x1a
+#define GLOBAL2_SCRATCH_BUSY BIT(15)
+#define GLOBAL2_SCRATCH_REGISTER_SHIFT 8
+#define GLOBAL2_SCRATCH_VALUE_MASK 0xff
#define GLOBAL2_WDOG_CONTROL 0x1b
#define GLOBAL2_QOS_WEIGHT 0x1c
#define GLOBAL2_MISC 0x1d
--
2.1.4
--
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