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6cb3273d11
Implement support for CONFIG_SERIAL_MULTI into JZ serial driver. This driver was so far only usable directly, but this patch also adds support for the multi method. This allows using more than one serial driver alongside the JZ driver. Also, add a weak implementation of default_serial_console() returning this driver. Signed-off-by: Marek Vasut <marex@denx.de> Cc: Marek Vasut <marek.vasut@gmail.com> Cc: Tom Rini <trini@ti.com> Cc: Daniel Schwierzeck <daniel.schwierzeck@googlemail.com>
170 lines
3.5 KiB
C
170 lines
3.5 KiB
C
/*
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* Jz4740 UART support
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* Copyright (c) 2011
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* Qi Hardware, Xiangfu Liu <xiangfu@sharism.cc>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <config.h>
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#include <common.h>
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#include <asm/io.h>
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#include <asm/jz4740.h>
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#include <serial.h>
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#include <linux/compiler.h>
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/*
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* serial_init - initialize a channel
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*
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* This routine initializes the number of data bits, parity
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* and set the selected baud rate. Interrupts are disabled.
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* Set the modem control signals if the option is selected.
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*
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* RETURNS: N/A
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*/
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struct jz4740_uart *uart = (struct jz4740_uart *)CONFIG_SYS_UART_BASE;
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static int jz_serial_init(void)
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{
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/* Disable port interrupts while changing hardware */
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writeb(0, &uart->dlhr_ier);
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/* Disable UART unit function */
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writeb(~UART_FCR_UUE, &uart->iir_fcr);
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/* Set both receiver and transmitter in UART mode (not SIR) */
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writeb(~(SIRCR_RSIRE | SIRCR_TSIRE), &uart->isr);
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/*
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* Set databits, stopbits and parity.
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* (8-bit data, 1 stopbit, no parity)
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*/
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writeb(UART_LCR_WLEN_8 | UART_LCR_STOP_1, &uart->lcr);
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/* Set baud rate */
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serial_setbrg();
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/* Enable UART unit, enable and clear FIFO */
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writeb(UART_FCR_UUE | UART_FCR_FE | UART_FCR_TFLS | UART_FCR_RFLS,
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&uart->iir_fcr);
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return 0;
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}
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static void jz_serial_setbrg(void)
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{
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u32 baud_div, tmp;
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baud_div = CONFIG_SYS_EXTAL / 16 / CONFIG_BAUDRATE;
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tmp = readb(&uart->lcr);
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tmp |= UART_LCR_DLAB;
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writeb(tmp, &uart->lcr);
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writeb((baud_div >> 8) & 0xff, &uart->dlhr_ier);
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writeb(baud_div & 0xff, &uart->rbr_thr_dllr);
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tmp &= ~UART_LCR_DLAB;
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writeb(tmp, &uart->lcr);
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}
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static int jz_serial_tstc(void)
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{
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if (readb(&uart->lsr) & UART_LSR_DR)
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return 1;
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return 0;
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}
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static void jz_serial_putc(const char c)
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{
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if (c == '\n')
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serial_putc('\r');
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/* Wait for fifo to shift out some bytes */
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while (!((readb(&uart->lsr) & (UART_LSR_TDRQ | UART_LSR_TEMT)) == 0x60))
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;
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writeb((u8)c, &uart->rbr_thr_dllr);
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}
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static int jz_serial_getc(void)
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{
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while (!serial_tstc())
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;
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return readb(&uart->rbr_thr_dllr);
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}
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static void jz_serial_puts(const char *s)
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{
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while (*s)
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serial_putc(*s++);
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}
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#ifdef CONFIG_SERIAL_MULTI
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static struct serial_device jz_serial_drv = {
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.name = "jz_serial",
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.start = jz_serial_init,
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.stop = NULL,
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.setbrg = jz_serial_setbrg,
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.putc = jz_serial_putc,
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.puts = jz_serial_puts,
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.getc = jz_serial_getc,
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.tstc = jz_serial_tstc,
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};
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void jz_serial_initialize(void)
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{
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serial_register(&jz_serial_drv);
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}
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__weak struct serial_device *default_serial_console(void)
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{
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return &jz_serial_drv;
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}
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#else
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int serial_init(void)
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{
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return jz_serial_init();
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}
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void serial_setbrg(void)
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{
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jz_serial_setbrg();
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}
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void serial_putc(const char c)
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{
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jz_serial_putc(c);
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}
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void serial_puts(const char *s)
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{
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jz_serial_puts(s);
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}
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int serial_getc(void)
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{
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return jz_serial_getc();
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}
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int serial_tstc(void)
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{
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return jz_serial_tstc();
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}
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#endif
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