3 * Rob Taylor, Flying Pig Systems. robt@flyingpig.com.
7 * Philippe Robin, <philippe.robin@arm.com>
9 * See file CREDITS for list of people who contributed to this
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License as
14 * published by the Free Software Foundation; either version 2 of
15 * the License, or (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
28 /* Simple U-Boot driver for the PrimeCell PL011 UARTs on the IntegratorCP */
29 /* Should be fairly simple to make it work with the PL010 as well */
33 #ifdef CFG_PL010_SERIAL
35 #include "serial_pl011.h"
37 #define IO_WRITE(addr, val) (*(volatile unsigned int *)(addr) = (val))
38 #define IO_READ(addr) (*(volatile unsigned int *)(addr))
40 /* Integrator AP has two UARTs, we use the first one, at 38400-8-N-1 */
42 #define CONSOLE_PORT CONFIG_CONS_INDEX
43 #define baudRate CONFIG_BAUDRATE
44 static volatile unsigned char * const port[NUM_PORTS] = {(void*)(CFG_SERIAL0),
45 (void*)(CFG_SERIAL1)};
48 static void pl010_putc(int portnum, char c);
49 static int pl010_getc(int portnum);
50 static int pl010_tstc(int portnum);
53 int serial_init (void)
59 ** First, disable everything.
61 IO_WRITE(port[CONSOLE_PORT] + UART_PL010_CR, 0x0);
69 divisor = UART_PL010_BAUD_9600;
73 divisor = UART_PL010_BAUD_9600;
77 divisor = UART_PL010_BAUD_38400;
81 divisor = UART_PL010_BAUD_57600;
85 divisor = UART_PL010_BAUD_115200;
89 divisor = UART_PL010_BAUD_38400;
92 IO_WRITE(port[CONSOLE_PORT] + UART_PL010_LCRM, ((divisor & 0xf00) >> 8));
93 IO_WRITE(port[CONSOLE_PORT] + UART_PL010_LCRL, (divisor & 0xff));
96 ** Set the UART to be 8 bits, 1 stop bit, no parity, fifo enabled.
98 IO_WRITE(port[CONSOLE_PORT] + UART_PL010_LCRH,
99 (UART_PL010_LCRH_WLEN_8 | UART_PL010_LCRH_FEN));
102 ** Finally, enable the UART
104 IO_WRITE(port[CONSOLE_PORT] + UART_PL010_CR, (UART_PL010_CR_UARTEN));
110 serial_putc(const char c)
113 pl010_putc(CONSOLE_PORT, '\r');
115 pl010_putc(CONSOLE_PORT, c);
119 serial_puts (const char *s)
129 return pl010_getc(CONSOLE_PORT);
135 return pl010_tstc(CONSOLE_PORT);
143 static void pl010_putc(int portnum, char c)
145 /* Wait until there is space in the FIFO */
146 while (IO_READ(port[portnum] + UART_PL01x_FR) & UART_PL01x_FR_TXFF);
148 /* Send the character */
149 IO_WRITE(port[portnum] + UART_PL01x_DR, c);
152 static int pl010_getc(int portnum)
156 /* Wait until there is data in the FIFO */
157 while (IO_READ(port[portnum] + UART_PL01x_FR) & UART_PL01x_FR_RXFE);
159 data = IO_READ(port[portnum] + UART_PL01x_DR);
161 /* Check for an error flag */
162 if (data & 0xFFFFFF00)
164 /* Clear the error */
165 IO_WRITE(port[portnum] + UART_PL01x_ECR, 0xFFFFFFFF);
172 static int pl010_tstc(int portnum)
174 return !(IO_READ(port[portnum] + UART_PL01x_FR) & UART_PL01x_FR_RXFE);