[RFC 5/8] serial: amba-pl011: Pass on FIQ information to KGDB.
From: Daniel Thompson <hidden>
Date: 2014-05-14 15:58:42
Also in:
linux-devicetree, linux-serial
Subsystem:
arm primecell uart pl010 and pl011 drivers, the rest, tty layer and serial drivers · Maintainers:
Russell King, Linus Torvalds, Greg Kroah-Hartman, Jiri Slaby
It is important this information comes from the serial driver because, by doing so, the driver offers "permission" for KGDB to route its interrupt signal from the drivers own handler to KGDBs FIQ handler (which will handle the interrupt signal by making polled I/O callbacks). Signed-off-by: Daniel Thompson <redacted> --- drivers/tty/serial/amba-pl011.c | 18 +++++++++++++++++- 1 file changed, 17 insertions(+), 1 deletion(-)
diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index dacf0a0..aac817a 100644
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c@@ -58,6 +58,7 @@ #include <linux/pinctrl/consumer.h> #include <linux/sizes.h> #include <linux/io.h> +#include <linux/kgdb.h> #define UART_NR 14
@@ -2091,6 +2092,18 @@ static int pl011_probe_dt_alias(int index, struct device *dev) return ret; } +#ifdef CONFIG_KGDB_FIQ +/* Register with KGDB if there is a FIQ linked to this device */ +static void pl011_register_fiq(struct amba_device *dev) +{ + int fiq = dev->irq[1]; + if (fiq > 0) + kgdb_register_fiq(fiq); +} +#else +static void pl011_register_fiq(struct platform_device *pdev) {} +#endif + static int pl011_probe(struct amba_device *dev, const struct amba_id *id) { struct uart_amba_port *uap;
@@ -2164,11 +2177,14 @@ static int pl011_probe(struct amba_device *dev, const struct amba_id *id) } ret = uart_add_one_port(&amba_reg, &uap->port); - if (ret) { + if (0 == ret) { + pl011_register_fiq(dev); + } else { amba_ports[i] = NULL; uart_unregister_driver(&amba_reg); pl011_dma_remove(uap); } + out: return ret; }
--
1.9.0