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serial: 16550: Add getfcr accessor

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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>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Marek Vasut 2016-12-01 02:06:29 +01:00 committed by Tom Rini
parent 8ea05705a7
commit 65f83802b7
2 changed files with 17 additions and 2 deletions
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18
drivers/serial/ns16550.c
View file

@ -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

1
include/ns16550.h
View file

@ -57,6 +57,7 @@ struct ns16550_platdata {
int reg_shift;
int clock;
int reg_offset;
u32 fcr;
};
struct udevice;