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git.ipfire.org Git - people/ms/u-boot.git/blob - drivers/serial/serial_pl01x.c
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 PL010/PL011 UARTs */
33 #include "serial_pl01x.h"
35 #define IO_WRITE(addr, val) (*(volatile unsigned int *)(addr) = (val))
36 #define IO_READ(addr) (*(volatile unsigned int *)(addr))
39 * Integrator AP has two UARTs, we use the first one, at 38400-8-N-1
40 * Integrator CP has two UARTs, use the first one, at 38400-8-N-1
41 * Versatile PB has four UARTs.
43 #define CONSOLE_PORT CONFIG_CONS_INDEX
44 #define baudRate CONFIG_BAUDRATE
45 static volatile unsigned char *const port
[] = CONFIG_PL01x_PORTS
;
46 #define NUM_PORTS (sizeof(port)/sizeof(port[0]))
48 static void pl01x_putc (int portnum
, char c
);
49 static int pl01x_getc (int portnum
);
50 static int pl01x_tstc (int portnum
);
52 #ifdef CONFIG_PL010_SERIAL
54 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
,
93 ((divisor
& 0xf00) >> 8));
94 IO_WRITE (port
[CONSOLE_PORT
] + UART_PL010_LCRL
, (divisor
& 0xff));
97 ** Set the UART to be 8 bits, 1 stop bit, no parity, fifo enabled.
99 IO_WRITE (port
[CONSOLE_PORT
] + UART_PL010_LCRH
,
100 (UART_PL010_LCRH_WLEN_8
| UART_PL010_LCRH_FEN
));
103 ** Finally, enable the UART
105 IO_WRITE (port
[CONSOLE_PORT
] + UART_PL010_CR
, (UART_PL010_CR_UARTEN
));
110 #endif /* CONFIG_PL010_SERIAL */
112 #ifdef CONFIG_PL011_SERIAL
114 int serial_init (void)
117 unsigned int divider
;
118 unsigned int remainder
;
119 unsigned int fraction
;
122 ** First, disable everything.
124 IO_WRITE (port
[CONSOLE_PORT
] + UART_PL011_CR
, 0x0);
129 ** IBRD = UART_CLK / (16 * BAUD_RATE)
130 ** FBRD = ROUND((64 * MOD(UART_CLK,(16 * BAUD_RATE))) / (16 * BAUD_RATE))
132 temp
= 16 * baudRate
;
133 divider
= CONFIG_PL011_CLOCK
/ temp
;
134 remainder
= CONFIG_PL011_CLOCK
% temp
;
135 temp
= (8 * remainder
) / baudRate
;
136 fraction
= (temp
>> 1) + (temp
& 1);
138 IO_WRITE (port
[CONSOLE_PORT
] + UART_PL011_IBRD
, divider
);
139 IO_WRITE (port
[CONSOLE_PORT
] + UART_PL011_FBRD
, fraction
);
142 ** Set the UART to be 8 bits, 1 stop bit, no parity, fifo enabled.
144 IO_WRITE (port
[CONSOLE_PORT
] + UART_PL011_LCRH
,
145 (UART_PL011_LCRH_WLEN_8
| UART_PL011_LCRH_FEN
));
148 ** Finally, enable the UART
150 IO_WRITE (port
[CONSOLE_PORT
] + UART_PL011_CR
,
151 (UART_PL011_CR_UARTEN
| UART_PL011_CR_TXE
|
157 #endif /* CONFIG_PL011_SERIAL */
159 void serial_putc (const char c
)
162 pl01x_putc (CONSOLE_PORT
, '\r');
164 pl01x_putc (CONSOLE_PORT
, c
);
167 void serial_puts (const char *s
)
174 int serial_getc (void)
176 return pl01x_getc (CONSOLE_PORT
);
179 int serial_tstc (void)
181 return pl01x_tstc (CONSOLE_PORT
);
184 void serial_setbrg (void)
188 static void pl01x_putc (int portnum
, char c
)
190 /* Wait until there is space in the FIFO */
191 while (IO_READ (port
[portnum
] + UART_PL01x_FR
) & UART_PL01x_FR_TXFF
)
194 /* Send the character */
195 IO_WRITE (port
[portnum
] + UART_PL01x_DR
, c
);
198 static int pl01x_getc (int portnum
)
202 /* Wait until there is data in the FIFO */
203 while (IO_READ (port
[portnum
] + UART_PL01x_FR
) & UART_PL01x_FR_RXFE
)
206 data
= IO_READ (port
[portnum
] + UART_PL01x_DR
);
208 /* Check for an error flag */
209 if (data
& 0xFFFFFF00) {
210 /* Clear the error */
211 IO_WRITE (port
[portnum
] + UART_PL01x_ECR
, 0xFFFFFFFF);
218 static int pl01x_tstc (int portnum
)
221 return !(IO_READ (port
[portnum
] + UART_PL01x_FR
) &