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Commit 56d95e22 authored by Andrew Lunn's avatar Andrew Lunn Committed by David S. Miller
Browse files

dsa: mv88x6xxx: Add debugfs interface for scratch registers 



Allow the contents of the scratch registers to be shown in debugfs.

Signed-off-by: default avatarAndrew Lunn <andrew@lunn.ch>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent d35bd876

drivers/net/dsa/mv88e6xxx.c

+54 −0
Original line number Diff line number Diff line
@@ -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;

}

drivers/net/dsa/mv88e6xxx.h

+3 −0
Original line number Diff line number Diff line
@@ -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