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PCI: tegra: Add debugfs support

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Provide a debugfs file ("pcie/ports") that shows the current link status
for each root port.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
This commit is contained in:
Thierry Reding 2014-07-22 12:30:46 -06:00 committed by Bjorn Helgaas
parent d975cb5703
commit 2cb989f6e9
1 changed files with 118 additions and 0 deletions
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118
drivers/pci/host/pci-tegra.c
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@ -25,6 +25,7 @@
*/
#include <linux/clk.h>
#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/export.h>
#include <linux/interrupt.h>
@ -277,6 +278,7 @@ struct tegra_pcie {
struct regulator *avdd_supply;
const struct tegra_pcie_soc_data *soc_data;
struct dentry *debugfs;
};
struct tegra_pcie_port {
@ -1638,6 +1640,115 @@ static const struct of_device_id tegra_pcie_of_match[] = {
};
MODULE_DEVICE_TABLE(of, tegra_pcie_of_match);
static void *tegra_pcie_ports_seq_start(struct seq_file *s, loff_t *pos)
{
struct tegra_pcie *pcie = s->private;
if (list_empty(&pcie->ports))
return NULL;
seq_printf(s, "Index Status\n");
return seq_list_start(&pcie->ports, *pos);
}
static void *tegra_pcie_ports_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
struct tegra_pcie *pcie = s->private;
return seq_list_next(v, &pcie->ports, pos);
}
static void tegra_pcie_ports_seq_stop(struct seq_file *s, void *v)
{
}
static int tegra_pcie_ports_seq_show(struct seq_file *s, void *v)
{
bool up = false, active = false;
struct tegra_pcie_port *port;
unsigned int value;
port = list_entry(v, struct tegra_pcie_port, list);
value = readl(port->base + RP_VEND_XP);
if (value & RP_VEND_XP_DL_UP)
up = true;
value = readl(port->base + RP_LINK_CONTROL_STATUS);
if (value & RP_LINK_CONTROL_STATUS_DL_LINK_ACTIVE)
active = true;
seq_printf(s, "%2u ", port->index);
if (up)
seq_printf(s, "up");
if (active) {
if (up)
seq_printf(s, ", ");
seq_printf(s, "active");
}
seq_printf(s, "\n");
return 0;
}
static const struct seq_operations tegra_pcie_ports_seq_ops = {
.start = tegra_pcie_ports_seq_start,
.next = tegra_pcie_ports_seq_next,
.stop = tegra_pcie_ports_seq_stop,
.show = tegra_pcie_ports_seq_show,
};
static int tegra_pcie_ports_open(struct inode *inode, struct file *file)
{
struct tegra_pcie *pcie = inode->i_private;
struct seq_file *s;
int err;
err = seq_open(file, &tegra_pcie_ports_seq_ops);
if (err)
return err;
s = file->private_data;
s->private = pcie;
return 0;
}
static const struct file_operations tegra_pcie_ports_ops = {
.owner = THIS_MODULE,
.open = tegra_pcie_ports_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
static int tegra_pcie_debugfs_init(struct tegra_pcie *pcie)
{
struct dentry *file;
pcie->debugfs = debugfs_create_dir("pcie", NULL);
if (!pcie->debugfs)
return -ENOMEM;
file = debugfs_create_file("ports", S_IFREG | S_IRUGO, pcie->debugfs,
pcie, &tegra_pcie_ports_ops);
if (!file)
goto remove;
return 0;
remove:
debugfs_remove_recursive(pcie->debugfs);
pcie->debugfs = NULL;
return -ENOMEM;
}
static int tegra_pcie_probe(struct platform_device *pdev)
{
const struct of_device_id *match;
@ -1692,6 +1803,13 @@ static int tegra_pcie_probe(struct platform_device *pdev)
goto disable_msi;
}
if (IS_ENABLED(CONFIG_DEBUG_FS)) {
err = tegra_pcie_debugfs_init(pcie);
if (err < 0)
dev_err(&pdev->dev, "failed to setup debugfs: %d\n",
err);
}
platform_set_drvdata(pdev, pcie);
return 0;