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ptp: add debugfs support for ptp_qoriq

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This patch is to add debugfs support for ptp_qoriq. Current debugfs
supports to control fiper1/fiper2 loopback mode. If the loopback mode
is enabled, the fiper1/fiper2 pulse is looped back into trigger1/
trigger2 input. This is very useful for validating hardware and driver
without external hardware. Below is an example to enable fiper1 loopback.

echo 1 > /sys/kernel/debug/2d10e00.ptp_clock/fiper1-loopback

Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yangbo Lu 2019-01-21 18:41:42 +08:00 committed by David S. Miller
parent 47205e2985
commit 19df7510d5
5 changed files with 120 additions and 2 deletions
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2
drivers/ptp/Kconfig
View File

@ -53,7 +53,7 @@ config PTP_1588_CLOCK_QORIQ
packets using the SO_TIMESTAMPING API.
To compile this driver as a module, choose M here: the module
will be called ptp_qoriq.
will be called ptp-qoriq.
config PTP_1588_CLOCK_IXP46X
tristate "Intel IXP46x as PTP clock"

4
drivers/ptp/Makefile
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@ -9,4 +9,6 @@ obj-$(CONFIG_PTP_1588_CLOCK_DTE) += ptp_dte.o
obj-$(CONFIG_PTP_1588_CLOCK_IXP46X) += ptp_ixp46x.o
obj-$(CONFIG_PTP_1588_CLOCK_PCH) += ptp_pch.o
obj-$(CONFIG_PTP_1588_CLOCK_KVM) += ptp_kvm.o
obj-$(CONFIG_PTP_1588_CLOCK_QORIQ) += ptp_qoriq.o
obj-$(CONFIG_PTP_1588_CLOCK_QORIQ) += ptp-qoriq.o
ptp-qoriq-y += ptp_qoriq.o
ptp-qoriq-$(CONFIG_DEBUG_FS) += ptp_qoriq_debugfs.o

3
drivers/ptp/ptp_qoriq.c
View File

@ -471,6 +471,7 @@ static int qoriq_ptp_probe(struct platform_device *dev)
err = -EINVAL;
qoriq_ptp->dev = &dev->dev;
qoriq_ptp->caps = ptp_qoriq_caps;
if (of_property_read_u32(node, "fsl,cksel", &qoriq_ptp->cksel))
@ -572,6 +573,7 @@ static int qoriq_ptp_probe(struct platform_device *dev)
}
qoriq_ptp->phc_index = ptp_clock_index(qoriq_ptp->clock);
ptp_qoriq_create_debugfs(qoriq_ptp);
platform_set_drvdata(dev, qoriq_ptp);
return 0;
@ -597,6 +599,7 @@ static int qoriq_ptp_remove(struct platform_device *dev)
qoriq_write(&regs->ctrl_regs->tmr_temask, 0);
qoriq_write(&regs->ctrl_regs->tmr_ctrl, 0);
ptp_qoriq_remove_debugfs(qoriq_ptp);
ptp_clock_unregister(qoriq_ptp->clock);
iounmap(qoriq_ptp->base);
release_resource(qoriq_ptp->rsrc);

101
drivers/ptp/ptp_qoriq_debugfs.c Normal file
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@ -0,0 +1,101 @@
// SPDX-License-Identifier: GPL-2.0+
/* Copyright 2019 NXP
*/
#include <linux/device.h>
#include <linux/debugfs.h>
#include <linux/fsl/ptp_qoriq.h>
static int ptp_qoriq_fiper1_lpbk_get(void *data, u64 *val)
{
struct qoriq_ptp *qoriq_ptp = data;
struct qoriq_ptp_registers *regs = &qoriq_ptp->regs;
u32 ctrl;
ctrl = qoriq_read(&regs->ctrl_regs->tmr_ctrl);
*val = ctrl & PP1L ? 1 : 0;
return 0;
}
static int ptp_qoriq_fiper1_lpbk_set(void *data, u64 val)
{
struct qoriq_ptp *qoriq_ptp = data;
struct qoriq_ptp_registers *regs = &qoriq_ptp->regs;
u32 ctrl;
ctrl = qoriq_read(&regs->ctrl_regs->tmr_ctrl);
if (val == 0)
ctrl &= ~PP1L;
else
ctrl |= PP1L;
qoriq_write(&regs->ctrl_regs->tmr_ctrl, ctrl);
return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(ptp_qoriq_fiper1_fops, ptp_qoriq_fiper1_lpbk_get,
ptp_qoriq_fiper1_lpbk_set, "%llu\n");
static int ptp_qoriq_fiper2_lpbk_get(void *data, u64 *val)
{
struct qoriq_ptp *qoriq_ptp = data;
struct qoriq_ptp_registers *regs = &qoriq_ptp->regs;
u32 ctrl;
ctrl = qoriq_read(&regs->ctrl_regs->tmr_ctrl);
*val = ctrl & PP2L ? 1 : 0;
return 0;
}
static int ptp_qoriq_fiper2_lpbk_set(void *data, u64 val)
{
struct qoriq_ptp *qoriq_ptp = data;
struct qoriq_ptp_registers *regs = &qoriq_ptp->regs;
u32 ctrl;
ctrl = qoriq_read(&regs->ctrl_regs->tmr_ctrl);
if (val == 0)
ctrl &= ~PP2L;
else
ctrl |= PP2L;
qoriq_write(&regs->ctrl_regs->tmr_ctrl, ctrl);
return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(ptp_qoriq_fiper2_fops, ptp_qoriq_fiper2_lpbk_get,
ptp_qoriq_fiper2_lpbk_set, "%llu\n");
void ptp_qoriq_create_debugfs(struct qoriq_ptp *qoriq_ptp)
{
struct dentry *root;
root = debugfs_create_dir(dev_name(qoriq_ptp->dev), NULL);
if (IS_ERR(root))
return;
if (!root)
goto err_root;
qoriq_ptp->debugfs_root = root;
if (!debugfs_create_file("fiper1-loopback", 0600, root, qoriq_ptp,
&ptp_qoriq_fiper1_fops))
goto err_node;
if (!debugfs_create_file("fiper2-loopback", 0600, root, qoriq_ptp,
&ptp_qoriq_fiper2_fops))
goto err_node;
return;
err_node:
debugfs_remove_recursive(root);
qoriq_ptp->debugfs_root = NULL;
err_root:
dev_err(qoriq_ptp->dev, "failed to initialize debugfs\n");
}
void ptp_qoriq_remove_debugfs(struct qoriq_ptp *qoriq_ptp)
{
debugfs_remove_recursive(qoriq_ptp->debugfs_root);
qoriq_ptp->debugfs_root = NULL;
}

12
include/linux/fsl/ptp_qoriq.h
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@ -143,6 +143,8 @@ struct qoriq_ptp {
struct ptp_clock *clock;
struct ptp_clock_info caps;
struct resource *rsrc;
struct dentry *debugfs_root;
struct device *dev;
bool extts_fifo_support;
int irq;
int phc_index;
@ -169,4 +171,14 @@ static inline void qoriq_write(unsigned __iomem *addr, u32 val)
iowrite32be(val, addr);
}
#ifdef CONFIG_DEBUG_FS
void ptp_qoriq_create_debugfs(struct qoriq_ptp *qoriq_ptp);
void ptp_qoriq_remove_debugfs(struct qoriq_ptp *qoriq_ptp);
#else
static inline void ptp_qoriq_create_debugfs(struct qoriq_ptp *qoriq_ptp)
{ }
static inline void ptp_qoriq_remove_debugfs(struct qoriq_ptp *qoriq_ptp)
{ }
#endif
#endif