/**
* @file
*
* @brief Driver for serial ports on the ERC32.
*/
/*
* Copyright (c) 2010 Tiemen Schut <T.Schut@sron.nl>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*/
#include <unistd.h>
#include <termios.h>
#include <stdlib.h>
#include <rtems.h>
#include <rtems/libio.h>
#include <rtems/console.h>
#include <rtems/termiostypes.h>
#include <libchip/serial.h>
#include <libchip/sersupp.h>
#include <bsp.h>
#include <bspopts.h>
#define CONSOLE_BUF_SIZE (16)
#define CONSOLE_UART_A_TRAP ERC32_TRAP_TYPE(ERC32_INTERRUPT_UART_A_RX_TX)
#define CONSOLE_UART_B_TRAP ERC32_TRAP_TYPE(ERC32_INTERRUPT_UART_B_RX_TX)
static uint8_t erc32_console_get_register(uintptr_t addr, uint8_t i)
{
volatile uint32_t *reg = (volatile uint32_t *)addr;
return (uint8_t) reg [i];
}
static void erc32_console_set_register(uintptr_t addr, uint8_t i, uint8_t val)
{
volatile uint32_t *reg = (volatile uint32_t *)addr;
reg [i] = val;
}
static int erc32_console_first_open(int major, int minor, void *arg);
#if (CONSOLE_USE_INTERRUPTS)
static ssize_t erc32_console_write_support_int(
int minor, const char *buf, size_t len);
#else
int console_inbyte_nonblocking( int port );
static ssize_t erc32_console_write_support_polled(
int minor, const char *buf, size_t len);
#endif
static void erc32_console_initialize(int minor);
#if (CONSOLE_USE_INTERRUPTS)
const console_fns erc32_fns = {
libchip_serial_default_probe, /* deviceProbe */
erc32_console_first_open, /* deviceFirstOpen */
NULL, /* deviceLastClose */
NULL, /* deviceRead */
erc32_console_write_support_int, /* deviceWrite */
erc32_console_initialize, /* deviceInitialize */
NULL, /* deviceWritePolled */
NULL, /* deviceSetAttributes */
TERMIOS_IRQ_DRIVEN /* deviceOutputUsesInterrupts */
};
#else
const console_fns erc32_fns = {
libchip_serial_default_probe, /* deviceProbe */
erc32_console_first_open, /* deviceFirstOpen */
NULL, /* deviceLastClose */
console_inbyte_nonblocking, /* deviceRead */
erc32_console_write_support_polled, /* deviceWrite */
erc32_console_initialize, /* deviceInitialize */
NULL, /* deviceWritePolled */
NULL, /* deviceSetAttributes */
TERMIOS_POLLED /* deviceOutputUsesInterrupts */
};
#endif
console_tbl Console_Configuration_Ports [] = {
{
.sDeviceName = "/dev/console_a",
.deviceType = SERIAL_CUSTOM,
.pDeviceFns = &erc32_fns,
.deviceProbe = NULL,
.pDeviceFlow = NULL,
.ulMargin = 16,
.ulHysteresis = 8,
.pDeviceParams = (void *) -1, /* could be baud rate */
.ulCtrlPort1 = 0,
.ulCtrlPort2 = 0,
.ulDataPort = 0,
.getRegister = erc32_console_get_register,
.setRegister = erc32_console_set_register,
.getData = NULL,
.setData = NULL,
.ulClock = 16,
.ulIntVector = ERC32_INTERRUPT_UART_A_RX_TX
},
{
.sDeviceName = "/dev/console_b",
.deviceType = SERIAL_CUSTOM,
.pDeviceFns = &erc32_fns,
.deviceProbe = NULL,
.pDeviceFlow = NULL,
.ulMargin = 16,
.ulHysteresis = 8,
.pDeviceParams = (void *) -1, /* could be baud rate */
.ulCtrlPort1 = 0,
.ulCtrlPort2 = 0,
.ulDataPort = 0,
.getRegister = erc32_console_get_register,
.setRegister = erc32_console_set_register,
.getData = NULL,
.setData = NULL,
.ulClock = 16,
.ulIntVector = ERC32_INTERRUPT_UART_B_RX_TX
},
};
/* always exactly two uarts for erc32 */
#define ERC32_UART_COUNT (2)
unsigned long Console_Configuration_Count = ERC32_UART_COUNT;
static int erc32_console_first_open(int major, int minor, void *arg)
{
/* Check minor number */
if (minor < 0 || minor > 1) {
return -1;
}
rtems_libio_open_close_args_t *oca = arg;
struct rtems_termios_tty *tty = oca->iop->data1;
console_tbl *ct = Console_Port_Tbl [minor];
console_data *cd = &Console_Port_Data [minor];
cd->termios_data = tty;
rtems_termios_set_initial_baud(tty, (int32_t)ct->pDeviceParams);
return 0;
}
#if (CONSOLE_USE_INTERRUPTS)
static ssize_t erc32_console_write_support_int(int minor, const char *buf, size_t len)
{
if (len > 0) {
console_data *cd = &Console_Port_Data[minor];
int k = 0;
if (minor == 0) { /* uart a */
for (k = 0;
k < len && (ERC32_MEC.UART_Status & ERC32_MEC_UART_STATUS_THEA); k ++) {
ERC32_MEC.UART_Channel_A = (unsigned char)buf[k];
}
ERC32_Force_interrupt(ERC32_INTERRUPT_UART_A_RX_TX);
} else { /* uart b */
for (k = 0;
k < len && (ERC32_MEC.UART_Status & ERC32_MEC_UART_STATUS_THEB); k ++) {
ERC32_MEC.UART_Channel_B = (unsigned char)buf[k];
}
ERC32_Force_interrupt(ERC32_INTERRUPT_UART_B_RX_TX);
}
cd->pDeviceContext = (void *)k;
cd->bActive = true;
}
return 0;
}
static void erc32_console_isr_error(
rtems_vector_number vector
)
{
int UStat;
UStat = ERC32_MEC.UART_Status;
if (UStat & ERC32_MEC_UART_STATUS_ERRA) {
ERC32_MEC.UART_Status = ERC32_MEC_UART_STATUS_CLRA;
ERC32_MEC.Control = ERC32_MEC.Control;
}
if (UStat & ERC32_MEC_UART_STATUS_ERRB) {
ERC32_MEC.UART_Status = ERC32_MEC_UART_STATUS_CLRB;
ERC32_MEC.Control = ERC32_MEC.Control;
}
ERC32_Clear_interrupt( ERC32_INTERRUPT_UART_ERROR );
}
static void erc32_console_isr_a(
rtems_vector_number vector
)
{
console_data *cd = &Console_Port_Data[0];
/* check for error */
if (ERC32_MEC.UART_Status & ERC32_MEC_UART_STATUS_ERRA) {
ERC32_MEC.UART_Status = ERC32_MEC_UART_STATUS_CLRA;
ERC32_MEC.Control = ERC32_MEC.Control;
}
do {
int chars_to_dequeue = (int)cd->pDeviceContext;
int rv = 0;
int i = 0;
char buf[CONSOLE_BUF_SIZE];
/* enqueue received chars */
while (i < CONSOLE_BUF_SIZE) {
if (!(ERC32_MEC.UART_Status & ERC32_MEC_UART_STATUS_DRA))
break;
buf[i] = ERC32_MEC.UART_Channel_A;
++i;
}
if ( i )
rtems_termios_enqueue_raw_characters(cd->termios_data, buf, i);
/* dequeue transmitted chars */
if (ERC32_MEC.UART_Status & ERC32_MEC_UART_STATUS_THEA) {
rv = rtems_termios_dequeue_characters(
cd->termios_data, chars_to_dequeue);
if ( !rv ) {
cd->pDeviceContext = 0;
cd->bActive = false;
}
ERC32_Clear_interrupt (ERC32_INTERRUPT_UART_A_RX_TX);
}
} while (ERC32_Is_interrupt_pending (ERC32_INTERRUPT_UART_A_RX_TX));
}
static void erc32_console_isr_b(
rtems_vector_number vector
)
{
console_data *cd = &Console_Port_Data[1];
/* check for error */
if (ERC32_MEC.UART_Status & ERC32_MEC_UART_STATUS_ERRB) {
ERC32_MEC.UART_Status = ERC32_MEC_UART_STATUS_CLRB;
ERC32_MEC.Control = ERC32_MEC.Control;
}
do {
int chars_to_dequeue = (int)cd->pDeviceContext;
int rv = 0;
int i = 0;
char buf[CONSOLE_BUF_SIZE];
/* enqueue received chars */
while (i < CONSOLE_BUF_SIZE) {
if (!(ERC32_MEC.UART_Status & ERC32_MEC_UART_STATUS_DRB))
break;
buf[i] = ERC32_MEC.UART_Channel_B;
++i;
}
if ( i )
rtems_termios_enqueue_raw_characters(cd->termios_data, buf, i);
/* dequeue transmitted chars */
if (ERC32_MEC.UART_Status & ERC32_MEC_UART_STATUS_THEB) {
rv = rtems_termios_dequeue_characters(
cd->termios_data, chars_to_dequeue);
if ( !rv ) {
cd->pDeviceContext = 0;
cd->bActive = false;
}
ERC32_Clear_interrupt (ERC32_INTERRUPT_UART_B_RX_TX);
}
} while (ERC32_Is_interrupt_pending (ERC32_INTERRUPT_UART_B_RX_TX));
}
#else
extern void console_outbyte_polled( int port, unsigned char ch );
static ssize_t erc32_console_write_support_polled(
int minor,
const char *buf,
size_t len
)
{
int nwrite = 0;
while (nwrite < len) {
console_outbyte_polled( minor, *buf++ );
nwrite++;
}
return nwrite;
}
#endif
/*
* Console Device Driver Entry Points
*
*/
static void erc32_console_initialize(
int minor
)
{
console_data *cd = &Console_Port_Data [minor];
cd->bActive = false;
cd->pDeviceContext = 0;
/*
* Initialize the Termios infrastructure. If Termios has already
* been initialized by another device driver, then this call will
* have no effect.
*/
rtems_termios_initialize();
/*
* Initialize Hardware
*/
#if (CONSOLE_USE_INTERRUPTS)
set_vector(erc32_console_isr_a, CONSOLE_UART_A_TRAP, 1);
set_vector(erc32_console_isr_b, CONSOLE_UART_B_TRAP, 1);
set_vector(erc32_console_isr_error, CONSOLE_UART_ERROR_TRAP, 1);
#endif
/* Clear any previous error flags */
ERC32_MEC.UART_Status = ERC32_MEC_UART_STATUS_CLRA;
ERC32_MEC.UART_Status = ERC32_MEC_UART_STATUS_CLRB;
}
