[U-Boot] [PATCH 01/13] serial: 16550: Add getfcr accessor

Marek Vasut
2016-12-01T01:06:29Z

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>
---
V2: If CONFIG_DM_SERIAL and DEBUG_UART are enabled, the ns16550_getfcr()
can be invoked with NULL plat data . Check for this case and return
the default UART_FCRVAL then.
V3: It turns out that if DEBUG_UART is defined, $port points directly to
hardware registers. Add additional ifdef to handle the case where
debug uart is enabled with DM_SERIAL correctly.
V4: Use UART_FCRVAL in _debug_uart_init() directly
---
drivers/serial/ns16550.c | 18 ++++++++++++++++--
include/ns16550.h | 1 +
2 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/drivers/serial/ns16550.c b/drivers/serial/ns16550.c
index 6e9b946..3c9f3b0 100644
--- a/drivers/serial/ns16550.c
+++ b/drivers/serial/ns16550.c
@@ -121,6 +121,13 @@ 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, \
@@ -128,6 +135,11 @@ 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)
@@ -171,7 +183,7 @@ 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) || \
@@ -192,7 +204,7 @@ 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 */
@@ -420,6 +432,8 @@ 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;
--
2.10.2