[U-Boot] [PATCH 1/3] serial: 16550: Add getfcr accessor

Marek Vasut
2016-05-26T18:39:46Z

Add function which allows fetching the default FCR register setting
from platform data for DM , while retaining old behavior for non-DM
by returning UART_FCRVAL.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Tom Rini <trini@konsulko.com>
Cc: Simon Glass <sjg@chromium.org>
---
drivers/serial/ns16550.c | 20 +++++++++++++++++---
include/ns16550.h | 1 +
2 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/drivers/serial/ns16550.c b/drivers/serial/ns16550.c
index c6cb3eb..b39ce02 100644
--- a/drivers/serial/ns16550.c
+++ b/drivers/serial/ns16550.c
@@ -120,6 +120,13 @@ static int ns16550_readb(NS16550_t port, int offset)
return serial_in_shift(addr + plat->reg_offset, plat->reg_shift);
}

+static u32 ns16550_getfcr(NS16550_t port)
+{
+ struct ns16550_platdata *plat = port->plat;
+
+ return plat->fcr;
+}
+
/* We can clean these up once everything is moved to driver model */
#define serial_out(value, addr) \
ns16550_writeb(com_port, \
@@ -127,6 +134,11 @@ static int ns16550_readb(NS16550_t port, int offset)
#define serial_in(addr) \
ns16550_readb(com_port, \
(unsigned char *)addr - (unsigned char *)com_port)
+#else
+static u32 ns16550_getfcr(NS16550_t port)
+{
+ return UART_FCRVAL;
+}
#endif

int ns16550_calc_divisor(NS16550_t port, int clock, int baudrate)
@@ -170,7 +182,7 @@ void NS16550_init(NS16550_t com_port, int baud_divisor)
serial_out(0x7, &com_port->mdr1); /* mode select reset TL16C750*/
#endif
serial_out(UART_MCRVAL, &com_port->mcr);
- serial_out(UART_FCRVAL, &com_port->fcr);
+ serial_out(ns16550_getfcr(com_port), &com_port->fcr);
if (baud_divisor != -1)
NS16550_setbrg(com_port, baud_divisor);
#if defined(CONFIG_OMAP) || \
@@ -191,7 +203,7 @@ void NS16550_reinit(NS16550_t com_port, int baud_divisor)
serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier);
NS16550_setbrg(com_port, 0);
serial_out(UART_MCRVAL, &com_port->mcr);
- serial_out(UART_FCRVAL, &com_port->fcr);
+ serial_out(ns16550_getfcr(com_port), &com_port->fcr);
NS16550_setbrg(com_port, baud_divisor);
}
#endif /* CONFIG_NS16550_MIN_FUNCTIONS */
@@ -262,7 +274,7 @@ static inline void _debug_uart_init(void)
CONFIG_BAUDRATE);
serial_dout(&com_port->ier, CONFIG_SYS_NS16550_IER);
serial_dout(&com_port->mcr, UART_MCRVAL);
- serial_dout(&com_port->fcr, UART_FCRVAL);
+ serial_dout(&com_port->fcr, ns16550_getfcr(com_port));

serial_dout(&com_port->lcr, UART_LCR_BKSE | UART_LCRVAL);
serial_dout(&com_port->dll, baud_divisor & 0xff);
@@ -405,6 +417,8 @@ int ns16550_serial_ofdata_to_platdata(struct udevice *dev)
return -EINVAL;
}

+ plat->fcr = UART_FCRVAL;
+
return 0;
}
#endif
diff --git a/include/ns16550.h b/include/ns16550.h
index 1311f4c..45fd68b 100644
--- a/include/ns16550.h
+++ b/include/ns16550.h
@@ -57,6 +57,7 @@ struct ns16550_platdata {
int reg_shift;
int clock;
int reg_offset;
+ u32 fcr;
};

struct udevice;
--
2.7.0