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/*
* Copyright (c) 2013-2014 embedded brains GmbH. All rights reserved.
*
* embedded brains GmbH
* Dornierstr. 4
* 82178 Puchheim
* Germany
* <info@embedded-brains.de>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#include <assert.h>
#include <bsp/irq.h>
#include <bsp/arm-pl050.h>
static volatile pl050 *pl050_get_regs(rtems_termios_device_context *base)
{
arm_pl050_context *ctx = (arm_pl050_context *) base;
return ctx->regs;
}
static void pl050_interrupt(void *arg)
{
rtems_termios_tty *tty = arg;
rtems_termios_device_context *base = rtems_termios_get_device_context(tty);
volatile pl050 *regs = pl050_get_regs(base);
uint32_t kmiir_rx = PL050_KMIIR_KMIRXINTR;
uint32_t kmiir_tx = (regs->kmicr & PL050_KMICR_KMITXINTREN) != 0 ?
PL050_KMIIR_KMITXINTR : 0;
uint32_t kmiir = regs->kmiir;
if ((kmiir & kmiir_rx) != 0) {
char c = (char) PL050_KMIDATA_KMIDATA_GET(regs->kmidata);
rtems_termios_enqueue_raw_characters(tty, &c, 1);
}
if ((kmiir & kmiir_tx) != 0) {
rtems_termios_dequeue_characters(tty, 1);
}
}
static bool pl050_first_open(
struct rtems_termios_tty *tty,
rtems_termios_device_context *base,
struct termios *term,
rtems_libio_open_close_args_t *args
)
{
arm_pl050_context *ctx = (arm_pl050_context *) base;
volatile pl050 *regs = pl050_get_regs(base);
rtems_status_code sc;
rtems_termios_set_initial_baud(tty, ctx->initial_baud);
regs->kmicr = PL050_KMICR_KMIEN | PL050_KMICR_KMIRXINTREN;
sc = rtems_interrupt_handler_install(
ctx->irq,
"PL050",
RTEMS_INTERRUPT_UNIQUE,
pl050_interrupt,
tty
);
assert(sc == RTEMS_SUCCESSFUL);
return true;
}
static void pl050_last_close(
struct rtems_termios_tty *tty,
rtems_termios_device_context *base,
rtems_libio_open_close_args_t *args
)
{
arm_pl050_context *ctx = (arm_pl050_context *) base;
volatile pl050 *regs = pl050_get_regs(base);
rtems_status_code sc;
regs->kmicr = 0;
sc = rtems_interrupt_handler_remove(
ctx->irq,
pl050_interrupt,
tty
);
assert(sc == RTEMS_SUCCESSFUL);
}
static void pl050_write_support(
rtems_termios_device_context *base,
const char *s,
size_t n
)
{
volatile pl050 *regs = pl050_get_regs(base);
if (n > 0) {
regs->kmidata = PL050_KMIDATA_KMIDATA(s[0]);
regs->kmicr |= PL050_KMICR_KMITXINTREN;
} else {
regs->kmicr &= ~PL050_KMICR_KMITXINTREN;
}
}
const rtems_termios_device_handler arm_pl050_fns = {
.first_open = pl050_first_open,
.last_close = pl050_last_close,
.write = pl050_write_support,
.mode = TERMIOS_IRQ_DRIVEN
};
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