diff options
Diffstat (limited to 'drivers/arm/pl011')
| -rw-r--r-- | drivers/arm/pl011/pl011.c | 41 | ||||
| -rw-r--r-- | drivers/arm/pl011/pl011_console.c | 93 |
2 files changed, 134 insertions, 0 deletions
diff --git a/drivers/arm/pl011/pl011.c b/drivers/arm/pl011/pl011.c new file mode 100644 index 0000000..e296c23 --- /dev/null +++ b/drivers/arm/pl011/pl011.c @@ -0,0 +1,41 @@ +/* + * Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * Redistributions of source code must retain the above copyright notice, this + * list of conditions and the following disclaimer. + * + * Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * + * Neither the name of ARM nor the names of its contributors may be used + * to endorse or promote products derived from this software without specific + * prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#include <assert.h> +#include <pl011.h> + +void pl011_setbaudrate(unsigned long base_addr, unsigned int baudrate) +{ + unsigned int divisor; + assert(baudrate); + divisor = (PL011_CLK_IN_HZ * 4) / baudrate; + pl011_write_ibrd(base_addr, divisor >> 6); + pl011_write_fbrd(base_addr, divisor & 0x3F); +} diff --git a/drivers/arm/pl011/pl011_console.c b/drivers/arm/pl011/pl011_console.c new file mode 100644 index 0000000..a26c00e --- /dev/null +++ b/drivers/arm/pl011/pl011_console.c @@ -0,0 +1,93 @@ +/* + * Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * Redistributions of source code must retain the above copyright notice, this + * list of conditions and the following disclaimer. + * + * Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * + * Neither the name of ARM nor the names of its contributors may be used + * to endorse or promote products derived from this software without specific + * prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#include <assert.h> +#include <console.h> +#include <pl011.h> + +static unsigned long uart_base; + +void console_init(unsigned long base_addr) +{ + /* TODO: assert() internally calls printf() and will result in + * an infinite loop. This needs to be fixed with some kind of + * exception mechanism or early panic support. This also applies + * to the other assert() calls below. + */ + assert(base_addr); + + /* Initialise internal base address variable */ + uart_base = base_addr; + + /* Baud Rate */ +#if defined(PL011_INTEGER) && defined(PL011_FRACTIONAL) + pl011_write_ibrd(uart_base, PL011_INTEGER); + pl011_write_fbrd(uart_base, PL011_FRACTIONAL); +#else + pl011_setbaudrate(uart_base, PL011_BAUDRATE); +#endif + + pl011_write_lcr_h(uart_base, PL011_LINE_CONTROL); + + /* Clear any pending errors */ + pl011_write_ecr(uart_base, 0); + + /* Enable tx, rx, and uart overall */ + pl011_write_cr(uart_base, PL011_UARTCR_RXE | PL011_UARTCR_TXE | + PL011_UARTCR_UARTEN); + +} + +#define WAIT_UNTIL_UART_FREE(base) \ + while ((pl011_read_fr(base) & PL011_UARTFR_TXFF)) \ + continue + +int console_putc(int c) +{ + assert(uart_base); + + if (c == '\n') { + WAIT_UNTIL_UART_FREE(uart_base); + pl011_write_dr(uart_base, '\r'); + } + + WAIT_UNTIL_UART_FREE(uart_base); + pl011_write_dr(uart_base, c); + return c; +} + +int console_getc(void) +{ + assert(uart_base); + + while ((pl011_read_fr(uart_base) & PL011_UARTFR_RXFE) != 0) + ; + return pl011_read_dr(uart_base); +} |