forked from Imagelibrary/rtems
92 lines
1.9 KiB
C
92 lines
1.9 KiB
C
/*
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* Copyright (c) 2013-2014 embedded brains GmbH. All rights reserved.
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*
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* embedded brains GmbH
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* Dornierstr. 4
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* 82178 Puchheim
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* Germany
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* <info@embedded-brains.de>
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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*/
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#include <dev/serial/arm-pl011.h>
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static volatile pl011 *pl011_get_regs(rtems_termios_device_context *base)
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{
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arm_pl011_context *ctx = (arm_pl011_context *) base;
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return ctx->regs;
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}
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bool arm_pl011_probe(rtems_termios_device_context *base)
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{
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volatile pl011 *regs = pl011_get_regs(base);
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regs->uartlcr_h = PL011_UARTLCR_H_WLEN(PL011_UARTLCR_H_WLEN_8);
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regs->uartcr = PL011_UARTCR_RXE
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| PL011_UARTCR_TXE
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| PL011_UARTCR_UARTEN;
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return true;
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}
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static bool pl011_first_open(
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struct rtems_termios_tty *tty,
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rtems_termios_device_context *base,
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struct termios *term,
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rtems_libio_open_close_args_t *args
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)
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{
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arm_pl011_context *ctx = (arm_pl011_context *) base;
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rtems_termios_set_initial_baud(tty, ctx->initial_baud);
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return true;
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}
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static int pl011_read_polled(rtems_termios_device_context *base)
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{
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volatile pl011 *regs = pl011_get_regs(base);
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if ((regs->uartfr & PL011_UARTFR_RXFE) != 0) {
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return -1;
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} else {
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return PL011_UARTDR_DATA_GET(regs->uartdr);
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}
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}
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void arm_pl011_write_polled(rtems_termios_device_context *base, char c)
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{
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volatile pl011 *regs = pl011_get_regs(base);
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while ((regs->uartfr & PL011_UARTFR_TXFF) != 0) {
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/* Wait */
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}
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regs->uartdr = PL011_UARTDR_DATA(c);
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}
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static void pl011_write_support_polled(
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rtems_termios_device_context *base,
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const char *s,
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size_t n
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)
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{
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size_t i;
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for (i = 0; i < n; ++i) {
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arm_pl011_write_polled(base, s[i]);
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}
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}
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const rtems_termios_device_handler arm_pl011_fns = {
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.first_open = pl011_first_open,
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.poll_read = pl011_read_polled,
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.write = pl011_write_support_polled,
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.mode = TERMIOS_POLLED
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};
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