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Date: Tue, 14 Sep 2021 19:16:31 -0700
From: Jonathan Lemon <jonathan.lemon@...il.com>
To: kuba@...nel.org, davem@...emloft.net, richardcochran@...il.com
Cc: netdev@...r.kernel.org, kernel-team@...com
Subject: [PATCH net-next 13/18] ptp: ocp: Add NMEA output
The timecard can provide a NMEA-1083 ZDA (time and date) output
string on a serial port, which can be used to drive other devices.
Add the NMEA resources, and the serial port as a sysfs attribute.
Signed-off-by: Jonathan Lemon <jonathan.lemon@...il.com>
---
drivers/ptp/ptp_ocp.c | 57 +++++++++++++++++++++++++++++++++++++++++--
1 file changed, 55 insertions(+), 2 deletions(-)
diff --git a/drivers/ptp/ptp_ocp.c b/drivers/ptp/ptp_ocp.c
index 36924423444e..74b5561fbdae 100644
--- a/drivers/ptp/ptp_ocp.c
+++ b/drivers/ptp/ptp_ocp.c
@@ -215,6 +215,7 @@ struct ptp_ocp {
struct irig_slave_reg __iomem *irig_in;
struct dcf_master_reg __iomem *dcf_out;
struct dcf_slave_reg __iomem *dcf_in;
+ struct tod_reg __iomem *nmea_out;
struct ptp_ocp_ext_src *pps;
struct ptp_ocp_ext_src *ts0;
struct ptp_ocp_ext_src *ts1;
@@ -232,6 +233,7 @@ struct ptp_ocp {
int n_irqs;
int gnss_port;
int mac_port; /* miniature atomic clock */
+ int nmea_port;
u8 serial[6];
bool has_serial;
int flash_start;
@@ -289,8 +291,9 @@ static int ptp_ocp_ts_enable(void *priv, bool enable);
* 5: MAC
* 6: TS2
* 7: I2C controller
- * 8: HWICAP
+ * 8: HWICAP (notused)
* 9: SPI Flash
+ * 10: NMEA
*/
static struct ocp_resource ocp_fb_resource[] = {
@@ -353,6 +356,10 @@ static struct ocp_resource ocp_fb_resource[] = {
OCP_MEM_RESOURCE(dcf_out),
.offset = 0x010A0000, .size = 0x10000,
},
+ {
+ OCP_MEM_RESOURCE(nmea_out),
+ .offset = 0x010B0000, .size = 0x10000,
+ },
{
OCP_MEM_RESOURCE(image),
.offset = 0x00020000, .size = 0x1000,
@@ -381,6 +388,10 @@ static struct ocp_resource ocp_fb_resource[] = {
OCP_SERIAL_RESOURCE(mac_port),
.offset = 0x00180000 + 0x1000, .irq_vec = 5,
},
+ {
+ OCP_SERIAL_RESOURCE(nmea_port),
+ .offset = 0x00190000 + 0x1000, .irq_vec = 10,
+ },
{
OCP_SPI_RESOURCE(spi_flash),
.offset = 0x00310000, .size = 0x10000, .irq_vec = 9,
@@ -761,6 +772,8 @@ ptp_ocp_utc_distribute(struct ptp_ocp *bp, u32 val)
iowrite32(val, &bp->irig_out->adj_sec);
if (bp->dcf_out)
iowrite32(val, &bp->dcf_out->adj_sec);
+ if (bp->nmea_out)
+ iowrite32(val, &bp->nmea_out->adj_sec);
spin_unlock_irqrestore(&bp->lock, flags);
}
@@ -1272,6 +1285,17 @@ ptp_ocp_register_mem(struct ptp_ocp *bp, struct ocp_resource *r)
return 0;
}
+static void
+ptp_ocp_nmea_out_init(struct ptp_ocp *bp)
+{
+ if (!bp->nmea_out)
+ return;
+
+ iowrite32(0, &bp->nmea_out->ctrl); /* disable */
+ iowrite32(7, &bp->nmea_out->uart_baud); /* 115200 */
+ iowrite32(1, &bp->nmea_out->ctrl); /* enable */
+}
+
/* FB specific board initializers; last "resource" registered. */
static int
ptp_ocp_fb_board_init(struct ptp_ocp *bp, struct ocp_resource *r)
@@ -1279,6 +1303,7 @@ ptp_ocp_fb_board_init(struct ptp_ocp *bp, struct ocp_resource *r)
bp->flash_start = 1024 * 4096;
ptp_ocp_tod_init(bp);
+ ptp_ocp_nmea_out_init(bp);
return ptp_ocp_init_clock(bp);
}
@@ -1941,6 +1966,13 @@ ptp_ocp_summary_show(struct seq_file *s, void *data)
on ? " ON" : "OFF", val, src);
}
+ if (bp->nmea_out) {
+ on = ioread32(&bp->nmea_out->ctrl) & 1;
+ val = ioread32(&bp->nmea_out->status);
+ seq_printf(s, "%7s: %s, error: %d\n", "NMEA",
+ on ? " ON" : "OFF", val);
+ }
+
/* compute src for PPS1, used below. */
if (bp->pps_select) {
val = ioread32(&bp->pps_select->gpio1);
@@ -2069,6 +2101,7 @@ ptp_ocp_device_init(struct ptp_ocp *bp, struct pci_dev *pdev)
spin_lock_init(&bp->lock);
bp->gnss_port = -1;
bp->mac_port = -1;
+ bp->nmea_port = -1;
bp->pdev = pdev;
device_initialize(&bp->dev);
@@ -2134,6 +2167,10 @@ ptp_ocp_complete(struct ptp_ocp *bp)
sprintf(buf, "ttyS%d", bp->mac_port);
ptp_ocp_link_child(bp, buf, "ttyMAC");
}
+ if (bp->nmea_port != -1) {
+ sprintf(buf, "ttyS%d", bp->nmea_port);
+ ptp_ocp_link_child(bp, buf, "ttyNMEA");
+ }
sprintf(buf, "ptp%d", ptp_clock_index(bp->ptp));
ptp_ocp_link_child(bp, buf, "ptp");
@@ -2180,7 +2217,13 @@ ptp_ocp_serial_info(struct device *dev, const char *name, int port, int baud)
static void
ptp_ocp_info(struct ptp_ocp *bp)
{
+ static int nmea_baud[] = {
+ 1200, 2400, 4800, 9600, 19200, 38400,
+ 57600, 115200, 230400, 460800, 921600,
+ 1000000, 2000000
+ };
struct device *dev = &bp->pdev->dev;
+ u32 reg;
ptp_ocp_phc_info(bp);
if (bp->tod)
@@ -2199,6 +2242,14 @@ ptp_ocp_info(struct ptp_ocp *bp)
}
ptp_ocp_serial_info(dev, "GNSS", bp->gnss_port, 115200);
ptp_ocp_serial_info(dev, "MAC", bp->mac_port, 57600);
+ if (bp->nmea_out && bp->nmea_port != -1) {
+ int baud = -1;
+
+ reg = ioread32(&bp->nmea_out->uart_baud);
+ if (reg < ARRAY_SIZE(nmea_baud))
+ baud = nmea_baud[reg];
+ ptp_ocp_serial_info(dev, "NMEA", bp->nmea_port, baud);
+ }
}
static void
@@ -2232,6 +2283,8 @@ ptp_ocp_detach(struct ptp_ocp *bp)
serial8250_unregister_port(bp->gnss_port);
if (bp->mac_port != -1)
serial8250_unregister_port(bp->mac_port);
+ if (bp->nmea_port != -1)
+ serial8250_unregister_port(bp->nmea_port);
if (bp->spi_flash)
platform_device_unregister(bp->spi_flash);
if (bp->i2c_ctrl)
@@ -2278,7 +2331,7 @@ ptp_ocp_probe(struct pci_dev *pdev, const struct pci_device_id *id)
* allow this - if not all of the IRQ's are returned, skip the
* extra devices and just register the clock.
*/
- err = pci_alloc_irq_vectors(pdev, 1, 10, PCI_IRQ_MSI | PCI_IRQ_MSIX);
+ err = pci_alloc_irq_vectors(pdev, 1, 11, PCI_IRQ_MSI | PCI_IRQ_MSIX);
if (err < 0) {
dev_err(&pdev->dev, "alloc_irq_vectors err: %d\n", err);
goto out;
--
2.31.1
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