ptp: add debugfs support for ptp_qoriq

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>

diff --git a/drivers/ptp/Kconfig b/drivers/ptp/Kconfig
index d137c48..aeb4a8b 100644 (file)
--- a/drivers/ptp/Kconfig
+++ b/drivers/ptp/Kconfig
@@ -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"

diff --git a/drivers/ptp/Makefile b/drivers/ptp/Makefile
index 19efa9c..677d1d1 100644 (file)
--- a/drivers/ptp/Makefile
+++ b/drivers/ptp/Makefile
@@ -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

diff --git a/drivers/ptp/ptp_qoriq.c b/drivers/ptp/ptp_qoriq.c
index a2e7702..43416b2 100644 (file)
--- a/drivers/ptp/ptp_qoriq.c
+++ b/drivers/ptp/ptp_qoriq.c
@@ -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);

diff --git a/drivers/ptp/ptp_qoriq_debugfs.c b/drivers/ptp/ptp_qoriq_debugfs.c
new file mode 100644 (file)
index 0000000..d904332
--- /dev/null
+++ b/drivers/ptp/ptp_qoriq_debugfs.c
@@ -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;
+}

diff --git a/include/linux/fsl/ptp_qoriq.h b/include/linux/fsl/ptp_qoriq.h
index 43b4b44..94e9797 100644 (file)
--- a/include/linux/fsl/ptp_qoriq.h
+++ b/include/linux/fsl/ptp_qoriq.h
@@ -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