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authorYangbo Lu <yangbo.lu@nxp.com>2019-01-21 13:41:42 +0300
committerDavid S. Miller <davem@davemloft.net>2019-01-23 07:21:57 +0300
commit19df7510d5cf077c2e88a7690fb7617e6d341beb (patch)
tree8f1c49592e7b63d60ff65a299078a6192005f8af /drivers/ptp/ptp_qoriq_debugfs.c
parent47205e2985d9338ccdb5ffc84147260ed7864015 (diff)
downloadlinux-19df7510d5cf077c2e88a7690fb7617e6d341beb.tar.xz
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>
Diffstat (limited to 'drivers/ptp/ptp_qoriq_debugfs.c')
-rw-r--r--drivers/ptp/ptp_qoriq_debugfs.c101
1 files changed, 101 insertions, 0 deletions
diff --git a/drivers/ptp/ptp_qoriq_debugfs.c b/drivers/ptp/ptp_qoriq_debugfs.c
new file mode 100644
index 000000000000..d904332b240d
--- /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;
+}