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_PL011_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))
41 * IntegratorCP has two UARTs, use the first one, at 38400-8-N-1
42 * Versatile PB has four UARTs.
45 #define CONSOLE_PORT CONFIG_CONS_INDEX
46 #define baudRate CONFIG_BAUDRATE
47 static volatile unsigned char * const port[NUM_PORTS] = {(void*)(CFG_SERIAL0),
48 (void*)(CFG_SERIAL1)};
51 static void pl011_putc(int portnum, char c);
52 static int pl011_getc(int portnum);
53 static int pl011_tstc(int portnum);
56 int serial_init (void)
60 unsigned int remainder;
61 unsigned int fraction;
64 ** First, disable everything.
66 IO_WRITE(port[CONSOLE_PORT] + UART_PL011_CR, 0x0);
71 ** IBRD = UART_CLK / (16 * BAUD_RATE)
72 ** FBRD = ROUND((64 * MOD(UART_CLK,(16 * BAUD_RATE))) / (16 * BAUD_RATE))
74 #ifdef CONFIG_VERSATILE
76 divider = 24000000 / temp;
77 remainder = 24000000 % temp;
78 temp = (8 * remainder) / baudRate;
79 fraction = (temp >> 1) + (temp & 1);
81 #ifdef CONFIG_INTEGRATOR
83 divider = 14745600 / temp;
84 remainder = 14745600 % temp;
85 temp = (8 * remainder) / baudRate;
86 fraction = (temp >> 1) + (temp & 1);
89 IO_WRITE(port[CONSOLE_PORT] + UART_PL011_IBRD, divider);
90 IO_WRITE(port[CONSOLE_PORT] + UART_PL011_FBRD, fraction);
93 ** Set the UART to be 8 bits, 1 stop bit, no parity, fifo enabled.
95 IO_WRITE(port[CONSOLE_PORT] + UART_PL011_LCRH,
96 (UART_PL011_LCRH_WLEN_8 | UART_PL011_LCRH_FEN));
99 ** Finally, enable the UART
101 IO_WRITE(port[CONSOLE_PORT] + UART_PL011_CR,
102 (UART_PL011_CR_UARTEN | UART_PL011_CR_TXE | UART_PL011_CR_RXE));
108 serial_putc(const char c)
111 pl011_putc(CONSOLE_PORT, '\r');
113 pl011_putc(CONSOLE_PORT, c);
117 serial_puts (const char *s)
127 return pl011_getc(CONSOLE_PORT);
133 return pl011_tstc(CONSOLE_PORT);
141 static void pl011_putc(int portnum, char c)
143 /* Wait until there is space in the FIFO */
144 while (IO_READ(port[portnum] + UART_PL01x_FR) & UART_PL01x_FR_TXFF);
146 /* Send the character */
147 IO_WRITE(port[portnum] + UART_PL01x_DR, c);
150 static int pl011_getc(int portnum)
154 /* Wait until there is data in the FIFO */
155 while (IO_READ(port[portnum] + UART_PL01x_FR) & UART_PL01x_FR_RXFE);
157 data = IO_READ(port[portnum] + UART_PL01x_DR);
159 /* Check for an error flag */
160 if (data & 0xFFFFFF00)
162 /* Clear the error */
163 IO_WRITE(port[portnum] + UART_PL01x_ECR, 0xFFFFFFFF);
170 static int pl011_tstc(int portnum)
172 return !(IO_READ(port[portnum] + UART_PL01x_FR) & UART_PL01x_FR_RXFE);