@@ -4,6 +4,7 @@
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/module.h>
+#include <linux/debugfs.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/serial_8250.h>
@@ -208,6 +209,7 @@ struct ptp_ocp {
struct tod_reg __iomem *tod;
struct pps_reg __iomem *pps_to_ext;
struct pps_reg __iomem *pps_to_clk;
+ struct gpio_reg __iomem *pps_select;
struct gpio_reg __iomem *sma;
struct irig_master_reg __iomem *irig_out;
struct irig_slave_reg __iomem *irig_in;
@@ -224,6 +226,7 @@ struct ptp_ocp {
struct platform_device *spi_flash;
struct clk_hw *i2c_clk;
struct timer_list watchdog;
+ struct dentry *debug_root;
time64_t gnss_lost;
int id;
int n_irqs;
@@ -354,6 +357,10 @@ static struct ocp_resource ocp_fb_resource[] = {
OCP_MEM_RESOURCE(image),
.offset = 0x00020000, .size = 0x1000,
},
+ {
+ OCP_MEM_RESOURCE(pps_select),
+ .offset = 0x00130000, .size = 0x1000,
+ },
{
OCP_MEM_RESOURCE(sma),
.offset = 0x00140000, .size = 0x1000,
@@ -1815,6 +1822,225 @@ static struct attribute *timecard_attrs[] = {
};
ATTRIBUTE_GROUPS(timecard);
+static const char *
+gpio_map(u32 gpio, u32 bit, const char *pri, const char *sec, const char *def)
+{
+ const char *ans;
+
+ if (gpio & (1 << bit))
+ ans = pri;
+ else if (gpio & (1 << (bit + 16)))
+ ans = sec;
+ else
+ ans = def;
+ return ans;
+}
+
+static void
+gpio_multi_map(char *buf, u32 gpio, u32 bit,
+ const char *pri, const char *sec, const char *def)
+{
+ char *ans = buf;
+
+ strcpy(ans, def);
+ if (gpio & (1 << bit))
+ ans += sprintf(ans, "%s ", pri);
+ if (gpio & (1 << (bit + 16)))
+ ans += sprintf(ans, "%s ", sec);
+}
+
+static int
+ptp_ocp_summary_show(struct seq_file *s, void *data)
+{
+ struct device *dev = s->private;
+ struct ptp_system_timestamp sts;
+ u32 sma_in, sma_out, ctrl, val;
+ struct ts_reg __iomem *ts_reg;
+ struct timespec64 ts;
+ struct ptp_ocp *bp;
+ const char *src;
+ char *buf;
+ bool on;
+
+ buf = (char *)__get_free_page(GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ bp = dev_get_drvdata(dev);
+ sma_in = ioread32(&bp->sma->gpio1);
+ sma_out = ioread32(&bp->sma->gpio2);
+
+ seq_printf(s, "%7s: /dev/ptp%d\n", "PTP", ptp_clock_index(bp->ptp));
+
+ sma1_show(dev, NULL, buf);
+ seq_printf(s, " sma1: %s", buf);
+
+ sma2_show(dev, NULL, buf);
+ seq_printf(s, " sma2: %s", buf);
+
+ sma3_show(dev, NULL, buf);
+ seq_printf(s, " sma3: %s", buf);
+
+ sma4_show(dev, NULL, buf);
+ seq_printf(s, " sma4: %s", buf);
+
+ if (bp->ts0) {
+ ts_reg = bp->ts0->mem;
+ on = ioread32(&ts_reg->enable);
+ src = "GNSS";
+ seq_printf(s, "%7s: %s, src: %s\n", "TS0",
+ on ? " ON" : "OFF", src);
+ }
+
+ if (bp->ts1) {
+ ts_reg = bp->ts1->mem;
+ on = ioread32(&ts_reg->enable);
+ src = gpio_map(sma_in, 2, "sma1", "sma2", "----");
+ seq_printf(s, "%7s: %s, src: %s\n", "TS1",
+ on ? " ON" : "OFF", src);
+ }
+
+ if (bp->ts2) {
+ ts_reg = bp->ts2->mem;
+ on = ioread32(&ts_reg->enable);
+ src = gpio_map(sma_in, 3, "sma1", "sma2", "----");
+ seq_printf(s, "%7s: %s, src: %s\n", "TS2",
+ on ? " ON" : "OFF", src);
+ }
+
+ if (bp->irig_out) {
+ ctrl = ioread32(&bp->irig_out->ctrl);
+ on = ctrl & IRIG_M_CTRL_ENABLE;
+ val = ioread32(&bp->irig_out->status);
+ gpio_multi_map(buf, sma_out, 4, "sma3", "sma4", "----");
+ seq_printf(s, "%7s: %s, error: %d, mode %d, out: %s\n", "IRIG",
+ on ? " ON" : "OFF", val, (ctrl >> 16), buf);
+ }
+
+ if (bp->irig_in) {
+ on = ioread32(&bp->irig_in->ctrl) & IRIG_S_CTRL_ENABLE;
+ val = ioread32(&bp->irig_in->status);
+ src = gpio_map(sma_in, 4, "sma1", "sma2", "----");
+ seq_printf(s, "%7s: %s, error: %d, src: %s\n", "IRIG in",
+ on ? " ON" : "OFF", val, src);
+ }
+
+ if (bp->dcf_out) {
+ on = ioread32(&bp->dcf_out->ctrl) & DCF_M_CTRL_ENABLE;
+ val = ioread32(&bp->dcf_out->status);
+ gpio_multi_map(buf, sma_out, 5, "sma3", "sma4", "----");
+ seq_printf(s, "%7s: %s, error: %d, out: %s\n", "DCF",
+ on ? " ON" : "OFF", val, buf);
+ }
+
+ if (bp->dcf_in) {
+ on = ioread32(&bp->dcf_in->ctrl) & DCF_S_CTRL_ENABLE;
+ val = ioread32(&bp->dcf_in->status);
+ src = gpio_map(sma_in, 5, "sma1", "sma2", "----");
+ seq_printf(s, "%7s: %s, error: %d, src: %s\n", "DCF in",
+ on ? " ON" : "OFF", val, src);
+ }
+
+ /* compute src for PPS1, used below. */
+ if (bp->pps_select) {
+ val = ioread32(&bp->pps_select->gpio1);
+ if (val & 0x01)
+ src = gpio_map(sma_in, 0, "sma1", "sma2", "----");
+ else if (val & 0x02)
+ src = "MAC";
+ else if (val & 0x04)
+ src = "GNSS";
+ else
+ src = "----";
+ } else {
+ src = "?";
+ }
+
+ /* assumes automatic switchover/selection */
+ val = ioread32(&bp->reg->select);
+ switch (val >> 16) {
+ case 0:
+ sprintf(buf, "----");
+ break;
+ case 2:
+ sprintf(buf, "IRIG");
+ break;
+ case 3:
+ sprintf(buf, "%s via PPS1", src);
+ break;
+ case 6:
+ sprintf(buf, "DCF");
+ break;
+ default:
+ strcpy(buf, "unknown");
+ break;
+ }
+ val = ioread32(&bp->reg->status);
+ seq_printf(s, "%7s: %s, state: %s\n", "PHC src", buf,
+ val & OCP_STATUS_IN_SYNC ? "sync" : "unsynced");
+
+ /* reuses PPS1 src from earlier */
+ seq_printf(s, "MAC PPS1 src: %s\n", src);
+
+ src = gpio_map(sma_in, 1, "sma1", "sma2", "GNSS2");
+ seq_printf(s, "MAC PPS2 src: %s\n", src);
+
+ if (!ptp_ocp_gettimex(&bp->ptp_info, &ts, &sts)) {
+ struct timespec64 sys_ts;
+ s64 pre_ns, post_ns, ns;
+
+ pre_ns = timespec64_to_ns(&sts.pre_ts);
+ post_ns = timespec64_to_ns(&sts.post_ts);
+ ns = (pre_ns + post_ns) / 2;
+ ns += (s64)bp->utc_tai_offset * NSEC_PER_SEC;
+ sys_ts = ns_to_timespec64(ns);
+
+ seq_printf(s, "%7s: %lld.%ld == %ptT TAI\n", "PHC",
+ ts.tv_sec, ts.tv_nsec, &ts);
+ seq_printf(s, "%7s: %lld.%ld == %ptT UTC offset %d\n", "SYS",
+ sys_ts.tv_sec, sys_ts.tv_nsec, &sys_ts,
+ bp->utc_tai_offset);
+ seq_printf(s, "%7s: PHC:SYS offset: %lld window: %lld\n", "",
+ timespec64_to_ns(&ts) - ns,
+ post_ns - pre_ns);
+ }
+
+ free_page((unsigned long)buf);
+ return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(ptp_ocp_summary);
+
+static struct dentry *ptp_ocp_debugfs_root;
+
+static void
+ptp_ocp_debugfs_add_device(struct ptp_ocp *bp)
+{
+ struct dentry *d;
+
+ d = debugfs_create_dir(dev_name(&bp->dev), ptp_ocp_debugfs_root);
+ bp->debug_root = d;
+ debugfs_create_file("summary", 0444, bp->debug_root,
+ &bp->dev, &ptp_ocp_summary_fops);
+}
+
+static void
+ptp_ocp_debugfs_remove_device(struct ptp_ocp *bp)
+{
+ debugfs_remove_recursive(bp->debug_root);
+}
+
+static void
+ptp_ocp_debugfs_init(void)
+{
+ ptp_ocp_debugfs_root = debugfs_create_dir("timecard", NULL);
+}
+
+static void
+ptp_ocp_debugfs_fini(void)
+{
+ debugfs_remove_recursive(ptp_ocp_debugfs_root);
+}
+
static void
ptp_ocp_dev_release(struct device *dev)
{
@@ -1918,6 +2144,8 @@ ptp_ocp_complete(struct ptp_ocp *bp)
if (device_add_groups(&bp->dev, timecard_groups))
pr_err("device add groups failed\n");
+ ptp_ocp_debugfs_add_device(bp);
+
return 0;
}
@@ -1988,6 +2216,7 @@ ptp_ocp_detach_sysfs(struct ptp_ocp *bp)
static void
ptp_ocp_detach(struct ptp_ocp *bp)
{
+ ptp_ocp_debugfs_remove_device(bp);
ptp_ocp_detach_sysfs(bp);
if (timer_pending(&bp->watchdog))
del_timer_sync(&bp->watchdog);
@@ -2157,6 +2386,8 @@ ptp_ocp_init(void)
const char *what;
int err;
+ ptp_ocp_debugfs_init();
+
what = "timecard class";
err = class_register(&timecard_class);
if (err)
@@ -2179,6 +2410,7 @@ ptp_ocp_init(void)
out_notifier:
class_unregister(&timecard_class);
out:
+ ptp_ocp_debugfs_fini();
pr_err(KBUILD_MODNAME ": failed to register %s: %d\n", what, err);
return err;
}
@@ -2189,6 +2421,7 @@ ptp_ocp_fini(void)
bus_unregister_notifier(&i2c_bus_type, &ptp_ocp_i2c_notifier);
pci_unregister_driver(&ptp_ocp_driver);
class_unregister(&timecard_class);
+ ptp_ocp_debugfs_fini();
}
module_init(ptp_ocp_init);
Provide a view into the timecard internals for debugging. Signed-off-by: Jonathan Lemon <jonathan.lemon@gmail.com> --- drivers/ptp/ptp_ocp.c | 233 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 233 insertions(+)