On 12:54 Thu 31 Jul , Guennadi Liakhovetski wrote:
> Ported from u-boot-1.1.6 driver by Samsung.
>
> Signed-off-by: Guennadi Liakhovetski <[EMAIL PROTECTED]>
> ---
> drivers/serial/Makefile | 1 +
> drivers/serial/s3c64xx.c | 189
> ++++++++++++++++++++++++++++++++++++++++++++++
> 2 files changed, 190 insertions(+), 0 deletions(-)
> create mode 100644 drivers/serial/s3c64xx.c
>
> diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile
> index c9e797e..70fe638 100644
> --- a/drivers/serial/Makefile
> +++ b/drivers/serial/Makefile
> @@ -36,6 +36,7 @@ COBJS-y += serial_pl010.o
> COBJS-y += serial_pl011.o
> COBJS-y += serial_xuartlite.o
> COBJS-y += serial_sh.o
> +COBJS-$(CONFIG_S3C64XX) += s3c64xx.o
> COBJS-y += usbtty.o
>
> COBJS := $(COBJS-y)
> diff --git a/drivers/serial/s3c64xx.c b/drivers/serial/s3c64xx.c
> new file mode 100644
> index 0000000..d7e9d01
> --- /dev/null
> +++ b/drivers/serial/s3c64xx.c
> @@ -0,0 +1,189 @@
> +/*
> + * (C) Copyright 2002
> + * Gary Jennejohn, DENX Software Engineering, <[EMAIL PROTECTED]>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
> + *
> + */
> +
> +#include <common.h>
> +
> +#include <s3c6400.h>
> +
> +#ifdef CONFIG_SERIAL1
> +#define UART_NR S3C64XX_UART0
> +
> +#elif defined(CONFIG_SERIAL2)
> +#define UART_NR S3C64XX_UART1
> +
> +#elif defined(CONFIG_SERIAL3)
> +#define UART_NR S3C64XX_UART2
> +
> +#else
> +#error "Bad: you didn't configure serial ..."
> +#endif
> +
> +#define barrier() asm volatile("" ::: "memory")
> +
> +/* See table in 31.6.11 */
> +static const int udivslot[] = {
> + 0,
> + 0x0080,
> + 0x0808,
> + 0x0888,
> + 0x2222,
> + 0x4924,
> + 0x4a52,
> + 0x54aa,
> + 0x5555,
> + 0xd555,
> + 0xd5d5,
> + 0xddd5,
> + 0xdddd,
> + 0xdfdd,
> + 0xdfdf,
> + 0xffdf,
> +};
> +
> +void serial_setbrg(void)
> +{
> + DECLARE_GLOBAL_DATA_PTR;
> + S3C64XX_UART *const uart = S3C64XX_GetBase_UART(UART_NR);
> + u32 reg, pclk_ratio = get_PCLK() / gd->baudrate;
> + int i;
> +
> + /* PCLK / (16 * baudrate) - 1 */
> + reg = pclk_ratio / 16 - 1;
> + i = pclk_ratio - (reg + 1) * 16;
> +
> + uart->UBRDIV = reg;
> + uart->UDIVSLOT = udivslot[i];
> +
> + for (i = 0; i < 100; i++)
> + barrier();
> +}
> +
> +/*
> + * Initialise the serial port with the given baudrate. The settings
> + * are always 8 data bits, no parity, 1 stop bit, no start bits.
> + *
> + */
> +int serial_init(void)
> +{
> + S3C64XX_UART *const uart = S3C64XX_GetBase_UART(UART_NR);
please do not use UPPERCASE var name and function & co
> +
> + /* reset and enable FIFOs, set triggers to the maximum */
> + uart->UFCON = 0xff;
> + uart->UMCON = 0;
> + /* 8N1 */
> + uart->ULCON = 3;
> + /* No interrupts, no DMA, pure polling */
> + uart->UCON = 5;
> +
> + serial_setbrg();
> +
> + return 0;
> +}
> +
> +/*
> + * Read a single byte from the serial port. Returns 1 on success, 0
> + * otherwise. When the function is succesfull, the character read is
> + * written into its argument c.
> + */
> +int serial_getc(void)
> +{
> + S3C64XX_UART *const uart = S3C64XX_GetBase_UART(UART_NR);
> +
> + /* wait for character to arrive */
> + while (!(uart->UTRSTAT & 0x1));
> +
> + return uart->URXH & 0xff;
> +}
> +
> +#ifdef CONFIG_HWFLOW
> +static int hwflow = 0; /* turned off by default */
> +int hwflow_onoff(int on)
> +{
> + switch (on) {
> + case 0:
> + default:
> + break; /* return current */
IMHO it's weird to have the default at top
> + case 1:
> + hwflow = 1; /* turn on */
> + break;
> + case -1:
> + hwflow = 0; /* turn off */
> + break;
> + }
> + return hwflow;
> +}
> +#endif
> +
Best Regards,
J.
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