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 */
34 #if defined(CFG_PL010_SERIAL) || defined(CFG_PL011_SERIAL)
36 #include "serial_pl01x.h"
38 #define IO_WRITE(addr, val) (*(volatile unsigned int *)(addr) = (val))
39 #define IO_READ(addr) (*(volatile unsigned int *)(addr))
42 * Integrator AP has two UARTs, we use the first one, at 38400-8-N-1
43 * Integrator CP has two UARTs, use the first one, at 38400-8-N-1
44 * Versatile PB has four UARTs.
46 #define CONSOLE_PORT CONFIG_CONS_INDEX
47 #define baudRate CONFIG_BAUDRATE
48 static volatile unsigned char *const port[] = CONFIG_PL01x_PORTS;
49 #define NUM_PORTS (sizeof(port)/sizeof(port[0]))
51 static void pl01x_putc (int portnum, char c);
52 static int pl01x_getc (int portnum);
53 static int pl01x_tstc (int portnum);
55 #ifdef CFG_PL010_SERIAL
57 int serial_init (void)
62 ** First, disable everything.
64 IO_WRITE (port[CONSOLE_PORT] + UART_PL010_CR, 0x0);
72 divisor = UART_PL010_BAUD_9600;
76 divisor = UART_PL010_BAUD_9600;
80 divisor = UART_PL010_BAUD_38400;
84 divisor = UART_PL010_BAUD_57600;
88 divisor = UART_PL010_BAUD_115200;
92 divisor = UART_PL010_BAUD_38400;
95 IO_WRITE (port[CONSOLE_PORT] + UART_PL010_LCRM,
96 ((divisor & 0xf00) >> 8));
97 IO_WRITE (port[CONSOLE_PORT] + UART_PL010_LCRL, (divisor & 0xff));
100 ** Set the UART to be 8 bits, 1 stop bit, no parity, fifo enabled.
102 IO_WRITE (port[CONSOLE_PORT] + UART_PL010_LCRH,
103 (UART_PL010_LCRH_WLEN_8 | UART_PL010_LCRH_FEN));
106 ** Finally, enable the UART
108 IO_WRITE (port[CONSOLE_PORT] + UART_PL010_CR, (UART_PL010_CR_UARTEN));
113 #endif /* CFG_PL010_SERIAL */
115 #ifdef CFG_PL011_SERIAL
117 int serial_init (void)
120 unsigned int divider;
121 unsigned int remainder;
122 unsigned int fraction;
125 ** First, disable everything.
127 IO_WRITE (port[CONSOLE_PORT] + UART_PL011_CR, 0x0);
132 ** IBRD = UART_CLK / (16 * BAUD_RATE)
133 ** FBRD = ROUND((64 * MOD(UART_CLK,(16 * BAUD_RATE))) / (16 * BAUD_RATE))
135 temp = 16 * baudRate;
136 divider = CONFIG_PL011_CLOCK / temp;
137 remainder = CONFIG_PL011_CLOCK % temp;
138 temp = (8 * remainder) / baudRate;
139 fraction = (temp >> 1) + (temp & 1);
141 IO_WRITE (port[CONSOLE_PORT] + UART_PL011_IBRD, divider);
142 IO_WRITE (port[CONSOLE_PORT] + UART_PL011_FBRD, fraction);
145 ** Set the UART to be 8 bits, 1 stop bit, no parity, fifo enabled.
147 IO_WRITE (port[CONSOLE_PORT] + UART_PL011_LCRH,
148 (UART_PL011_LCRH_WLEN_8 | UART_PL011_LCRH_FEN));
151 ** Finally, enable the UART
153 IO_WRITE (port[CONSOLE_PORT] + UART_PL011_CR,
154 (UART_PL011_CR_UARTEN | UART_PL011_CR_TXE |
160 #endif /* CFG_PL011_SERIAL */
162 void serial_putc (const char c)
165 pl01x_putc (CONSOLE_PORT, '\r');
167 pl01x_putc (CONSOLE_PORT, c);
170 void serial_puts (const char *s)
177 int serial_getc (void)
179 return pl01x_getc (CONSOLE_PORT);
182 int serial_tstc (void)
184 return pl01x_tstc (CONSOLE_PORT);
187 void serial_setbrg (void)
191 static void pl01x_putc (int portnum, char c)
193 /* Wait until there is space in the FIFO */
194 while (IO_READ (port[portnum] + UART_PL01x_FR) & UART_PL01x_FR_TXFF)
197 /* Send the character */
198 IO_WRITE (port[portnum] + UART_PL01x_DR, c);
201 static int pl01x_getc (int portnum)
205 /* Wait until there is data in the FIFO */
206 while (IO_READ (port[portnum] + UART_PL01x_FR) & UART_PL01x_FR_RXFE)
209 data = IO_READ (port[portnum] + UART_PL01x_DR);
211 /* Check for an error flag */
212 if (data & 0xFFFFFF00) {
213 /* Clear the error */
214 IO_WRITE (port[portnum] + UART_PL01x_ECR, 0xFFFFFFFF);
221 static int pl01x_tstc (int portnum)
224 return !(IO_READ (port[portnum] + UART_PL01x_FR) &