/*
* console.c
*
* This file contains the MVME167 termios console package. Only asynchronous
* I/O is supported.
*
* /dev/tty0 is channel 0, Serial Port 1/Console on the MVME712M.
* /dev/tty1 is channel 1, Serial Port 2/TTY01 on the MVME712M.
* /dev/tty2 is channel 2, Serial Port 3 on the MVME712M.
* /dev/tty3 is channel 3, Serial Port 4 on the MVME712M.
*
* Normal I/O uses DMA for output, interrupts for input. /dev/console is
* fixed to be /dev/tty01, Serial Port 2. Very limited support is provided
* for polled I/O. Polled I/O is intended only for running the RTEMS test
* suites. In all cases, Serial Port 1/Console is allocated to 167Bug and
* is the dedicated debugger port. We configure GDB to use 167Bug for
* debugging. When debugging with GDB or 167Bug, do not open /dev/tty00.
*
* Modern I/O chips often contain a number of I/O devices that can operate
* almost independently of each other. Typically, in RTEMS, all devices in
* an I/O chip are handled by a single device driver, but that need not be
* always the case. Each device driver must supply six entry points in the
* Device Driver Table: a device initialization function, as well as an open,
* close, read, write and a control function. RTEMS assigns a device major
* number to each device driver. This major device number is the index of the
* device driver entries in the Device Driver Table, and it used to identify
* a particular device driver. To distinguish multiple I/O sub-devices within
* an I/O chip, RTEMS supports device minor numbers. When a I/O device is
* initialized, the major number is supplied to the initialization function.
* That function must register each sub-device with a separate name and minor
* number (as well as the supplied major number). When an application opens a
* device by name, the corresponding major and minor numbers are returned to
* the caller to be used in subsequent I/O operations (although these details
* are typically hidden within the library functions).
*
* Such a scheme recognizes that the initialization of the individual
* sub-devices is generally not completely independent. For example, the
* four serial ports of the CD2401 can be configured almost independently
* from each other. One port could be configured to operate in asynchronous
* mode with interrupt-driven I/O, while another port could be configured to
* operate in HDLC mode with DMA I/O. However, a device reset command will
* reset all four channels, and the width of DMA transfers and the number of
* retries following bus errors selected applies to all four channels.
* Consequently, when initializing one channel, one must be careful not to
* destroy the configuration of other channels that are already configured.
*
* One problem with the RTEMS I/O initialization model is that no information
* other than a device major number is passed to the initialization function.
* Consequently, the sub-devices must be initialized with some pre-determined
* configuration. To change the configuration of a sub-device, it is
* necessary to either rewrite the initialization function, or to make a
* series of rtems_io_control() calls after initialization. The first
* approach is not very elegant. The second approach is acceptable if an
* application is simply changing baud rates, parity or other such
* asynchronous parameters (as supplied by the termios package). But what if
* an application requires one channel to run in HDLC or Bisync mode and
* another in async mode? With a single driver per I/O chip approach, the
* device driver must support multiple protocols. This is feasible, but it
* often means that an application that only does asynchronous I/O now links
* in code for other unused protocols, thus wasting precious ROM space.
* Worse, it requires that the sub-devices be initialized in some
* configuration, and that configuration then changed through a series of
* device driver control calls. There is no standard API in RTEMS to switch
* a serial line to some synchronous protocol.
*
* A better approach is to treat each channel as a separate device, each with
* its own device device driver. The application then supplies its own device
* driver table with only the required protocols (drivers) on each line. The
* problem with this approach is that the device drivers are not really
* independent, given that the I/O sub-devices within a common chip are not
* independent themselves. Consequently, the related device drivers must
* share some information. In RTEMS, there is no standard location in which
* to share information.
*
* This driver handles all four channels, i.e. it distinguishes the
* sub-devices using minor device numbers. Only asynchronous I/O is
* supported. The console is currently fixed to be channel 1 on the CD2401,
* which corresponds to the TTY01 port (Serial Port 2) on the MVME712M
* Transition Module.
*
* The CD2401 does either interrupt-driven or DMA I/O; it does not support
* polling. In interrupt-driven or DMA I/O modes, interrupts from the CD2401
* are routed to the MC68040, and the processor generates an interrupt
* acknowledge cycle directly to the CD2401 to obtain an interrupt vector.
* The PCCchip2 supports a pseudo-polling mode in which interrupts from the
* CD2401 are not routed to the MC68040, but can be detected by the processor
* by reading the appropriate CD2401 registers. In this mode, interrupt
* acknowledge cycles must be generated to the CD2401 by reading the
* appropriate PCCchip2 registers.
*
* Interrupts from the four channels cannot be routed independently; either
* all channels are used in the pseudo-polling mode, or all channels are used
* in interrupt-driven/DMA mode. There is no advantage in using the speudo-
* polling mode. Consenquently, this driver performs DMA input and output.
* Output is performed directly from the termios raw output buffer, while
* input is accumulated into a separate buffer.
*
* THIS MODULE IS NOT RE-ENTRANT! Simultaneous access to a device from
* multiple tasks is likely to cause significant problems! Concurrency
* control is implemented in the termios package.
*
* THE INTERRUPT LEVEL IS SET TO 1 FOR ALL CHANNELS.
* If the CD2401 is to be used for high speed synchronous serial I/O, the
* interrupt priority might need to be increased.
*
* ALL INTERRUPT HANDLERS ARE SHARED.
* When adding extra device drivers, either rewrite the interrupt handlers
* to demultiplex the interrupts, or install separate vectors. Common vectors
* are currently used to catch spurious interrupts. We could already have
* installed separate vectors for each channel and used the spurious
* interrupt handler defined in some other BSPs, but handling spurious
* interrupts from the CD2401 in this device driver allows us to record more
* information on the source of the interrupts. Furthermore, we have observed
* the occasional spurious interrupt from channel 0. We definitely do not
* to call a debugger for those.
*
* All page references are to the MVME166/MVME167/MVME187 Single Board
* Computer Programmer's Reference Guide (MVME187PG/D2) with the April
* 1993 supplements/addenda (MVME187PG/D2A1).
*
* Copyright (c) 1998, National Research Council of Canada
*
* 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.
*/
#define M167_INIT
#include <stdarg.h>
#include <stdio.h>
#include <termios.h>
#include <rtems/termiostypes.h>
#include <bsp.h> /* Must be before libio.h */
#include <rtems/libio.h>
/* Utility functions */
void cd2401_udelay( unsigned long delay );
void cd2401_chan_cmd( uint8_t channel, uint8_t cmd, uint8_t wait );
uint16_t cd2401_bitrate_divisor( uint32_t clkrate, uint32_t * bitrate );
void cd2401_initialize( void );
void cd2401_interrupts_initialize( bool enable );
/* ISRs */
rtems_isr cd2401_modem_isr( rtems_vector_number vector );
rtems_isr cd2401_re_isr( rtems_vector_number vector );
rtems_isr cd2401_rx_isr( rtems_vector_number vector );
rtems_isr cd2401_tx_isr( rtems_vector_number vector );
/* Termios callbacks */
int cd2401_firstOpen( int major, int minor, void *arg );
int cd2401_lastClose( int major, int minor, void *arg );
int cd2401_setAttributes( int minor, const struct termios *t );
int cd2401_startRemoteTx( int minor );
int cd2401_stopRemoteTx( int minor );
ssize_t cd2401_write( int minor, const char *buf, size_t len );
int cd2401_drainOutput( int minor );
int _167Bug_pollRead( int minor );
ssize_t _167Bug_pollWrite( int minor, const char *buf, size_t len );
/* Printk function */
static void _BSP_output_char( char c );
BSP_output_char_function_type BSP_output_char = _BSP_output_char;
BSP_polling_getchar_function_type BSP_poll_char = NULL;
/* '\r' character in memory. This used to live on
* the stack but storing the '\r' character is
* optimized away by gcc-4.3.2 (since it seems to
* be unused [only referenced from inline assembly
* code in _167Bug_pollWrite()]).
* Hence we make it a global constant.
*/
static const char cr_char = '\r';
/* Channel info */
/* static */ volatile struct {
void *tty; /* Really a struct rtems_termios_tty * */
int len; /* Record nb of chars being TX'ed */
const char *buf; /* Record where DMA is coming from */
uint32_t spur_cnt; /* Nb of spurious ints so far */
uint32_t spur_dev; /* Indo on last spurious int */
uint32_t buserr_addr; /* Faulting address */
uint32_t buserr_type; /* Reason of bus error during DMA */
uint8_t own_buf_A; /* If true, buffer A belongs to the driver */
uint8_t own_buf_B; /* If true, buffer B belongs to the driver */
uint8_t txEmpty; /* If true, the output FIFO should be empty */
} CD2401_Channel_Info[4];
/*
* The number of channels already opened. If zero, enable the interrupts. The
* initial value must be 0. If initialized explicitly, the variable ends up
* in the .data section. Its value is not re-initialized on system restart.
* Furthermore, because the variable is changed, the .data section would not
* be ROMable. We thus leave the variable uninitialized, which causes it to
* be allocated in the .bss section, and rely on RTEMS to zero the .bss
* section on every startup.
*/
uint8_t Init_count;
/* Record previous handlers */
rtems_isr_entry Prev_re_isr; /* Previous rx exception isr */
rtems_isr_entry Prev_rx_isr; /* Previous rx isr */
rtems_isr_entry Prev_tx_isr; /* Previous tx isr */
rtems_isr_entry Prev_modem_isr; /* Previous modem/timer isr */
/* Define the following symbol to trace the calls to this driver */
/* #define CD2401_RECORD_DEBUG_INFO */
#include "console-recording.h"
/*
* Utility functions.
*/
/*
* Assumes that clock ticks 1 million times per second.
*
* MAXIMUM DELAY IS ABOUT 20 ms
*
* Input parameters:
* delay: Number of microseconds to delay.
*
* Output parameters: NONE
*
* Return values: NONE
*/
void cd2401_udelay
(
unsigned long delay
)
{
unsigned long i = 20000; /* In case clock is off */
rtems_interval ticks_per_second, start_ticks, end_ticks, current_ticks;
ticks_per_second = rtems_clock_get_ticks_per_second();
start_ticks = rtems_clock_get_ticks_since_boot();
end_ticks = start_ticks + delay;
do {
current_ticks = rtems_clock_get_ticks_since_boot();
} while ( --i && (current_ticks <= end_ticks) );
CD2401_RECORD_DELAY_INFO(( start_ticks, end_ticks, current_ticks, i ));
}
/*
* cd2401_chan_cmd
*
* Sends a CCR command to the specified channel. Waits for any unfinished
* previous command to complete, then sends the specified command. Optionally
* wait for the current command to finish before returning.
*
* Input parameters:
* channel - CD2401 channel number
* cmd - command byte
* wait - if non-zero, wait for specified command to complete before
* returning.
*
* Output parameters: NONE
*
* Return values: NONE
*/
void cd2401_chan_cmd(
uint8_t channel,
uint8_t cmd,
uint8_t wait
)
{
if ( channel < 4 ) {
cd2401->car = channel; /* Select channel */
while ( cd2401->ccr != 0 ); /* Wait for completion of previous command */
cd2401->ccr = cmd; /* Send command */
if ( wait )
while( cd2401->ccr != 0 );/* Wait for completion */
}
else {
/* This may not be the best error message */
rtems_fatal_error_occurred( RTEMS_INVALID_NUMBER );
}
}
/*
* cd2401_bitrate_divisor
*
* Compute the divisor and clock source to use to obtain the desired bitrate.
*
* Input parameters:
* clkrate - system clock rate (CLK input frequency)
* bitrate - the desired bitrate
*
* Output parameters:
* bitrate - The actual bitrate achievable, to the nearest bps.
*
* Return values:
* Returns divisor in lower byte and clock source in upper byte for the
* specified bitrate.
*/
uint16_t cd2401_bitrate_divisor(
uint32_t clkrate,
uint32_t * bitrate
)
{
uint32_t divisor;
uint16_t clksource;
divisor = *bitrate << 3; /* temporary; multiply by 8 for CLK/8 */
divisor = (clkrate + (divisor>>1)) / divisor; /* divisor for clk0 (CLK/8) */
/* Use highest speed clock source for best precision - try clk0 to clk4 */
for( clksource = 0; clksource < 0x0400 && divisor > 0x100; clksource += 0x0100 )
divisor >>= 2;
divisor--; /* adjustment, see specs */
if( divisor < 1 )
divisor = 1;
else if( divisor > 0xFF )
divisor = 0xFF;
*bitrate = clkrate / (1 << ((clksource >> 7)+3)) / (divisor+1);
return( clksource | divisor );
}
/*
* cd2401_initialize
*
* Initializes the CD2401 device. Individual channels on the chip are left in
* their default reset state, and should be subsequently configured.
*
* Input parameters: NONE
*
* Output parameters: NONE
*
* Return values: NONE
*/
void cd2401_initialize( void )
{
int i;
for ( i = 3; i >= 0; i-- ) {
CD2401_Channel_Info[i].tty = NULL;
CD2401_Channel_Info[i].len = 0;
CD2401_Channel_Info[i].buf = NULL;
CD2401_Channel_Info[i].spur_cnt = 0;
CD2401_Channel_Info[i].spur_dev = 0;
CD2401_Channel_Info[i].buserr_type = 0;
CD2401_Channel_Info[i].buserr_addr = 0;
CD2401_Channel_Info[i].own_buf_A = TRUE;
CD2401_Channel_Info[i].own_buf_B = TRUE;
CD2401_Channel_Info[i].txEmpty = TRUE;
}
/*
* Normally, do a device reset here. If we do it, we will most likely clober
* the port settings for 167Bug on channel 0. So we just shut up all the
* ports by disabling their interrupts.
*/
#if 0
cd2401->gfrcr = 0; /* So we can detect that device init is done */
cd2401_chan_cmd( 0x10, 0); /* Reset all */
while(cd2401->gfrcr == 0); /* Wait for reset all */
#endif
/*
* The CL-CD2400/2401 manual (part no 542400-003) states on page 87 that
* the LICR "contains the number of the interrupting channel being served.
* The channel number is always that of the current acknowledged interrupt."
* THE USER MUST PROGRAM CHANNEL NUMBER IN LICR! It is not set automatically
* by the hardware, as suggested by the manual.
*
* The updated manual (part no 542400-007) has the story straight. The
* CD2401 automatically initializes the LICR to contain the channel number
* in bits 2 and 3. However, these bits are not preserved when the user
* defined bits are written.
*
* The same vector number is used for all four channels. Different vector
* numbers could be programmed for each channel, thus avoiding the need to
* demultiplex the interrupts in the ISR.
*/
for ( i = 0; i < 4; i++ ) {
cd2401->car = i; /* Select channel */
cd2401->livr = 0x5C; /* Motorola suggested value p. 3-15 */
cd2401->licr = i << 2; /* Don't rely on reset value */
cd2401->ier = 0; /* Disable all interrupts */
}
/*
* The content of the CD2401 xpilr registers must match the A7-A0 addresses
* generated by the PCCchip2 during interrupt acknowledge cycles in order
* for the CD2401 to recognize the IACK cycle and clear its interrupt
* request.
*/
cd2401->mpilr = 0x01; /* Match pccchip2->modem_piack p. 3-27 */
cd2401->tpilr = 0x02; /* Match pccchip2->tx_piack p. 3-28 */
cd2401->rpilr = 0x03; /* Match pccchip2->rx_piack p. 3-29 */
/* Global CD2401 registers */
cd2401->dmr = 0; /* 16-bit DMA transfers when possible */
cd2401->bercnt = 0; /* Do not retry DMA upon bus errors */
/*
* Setup timer prescaler period, which clocks timers 1 and 2 (or rx timeout
* and tx delay). The prescaler is clocked by the system clock) / 2048. The
* register must be in the range 0x0A..0xFF, ie. a rescaler period range of
* about 1ms..26ms for a nominal system clock rate of 20MHz.
*/
cd2401->tpr = 0x0A; /* Same value as 167Bug */
}
/*
* cd2401_interrupts_initialize
*
* This routine enables or disables the CD2401 interrupts to the MC68040.
* Interrupts cannot be enabled/disabled on a per-channel basis.
*
* Input parameters:
* enable - if true, enable the interrupts, else disable them.
*
* Output parameters: NONE
*
* Return values: NONE
*
* THE FIRST CD2401 CHANNEL OPENED SHOULD ENABLE INTERRUPTS.
* THE LAST CD2401 CHANNEL CLOSED SHOULD DISABLE INTERRUPTS.
*/
void cd2401_interrupts_initialize(
bool enable
)
{
if ( enable ) {
/*
* Enable interrupts from the CD2401 in the PCCchip2.
* During DMA transfers, the MC68040 supplies dirty data during read cycles
* from the CD2401 and leaves the data dirty in its data cache if there is
* a cache hit. The MC68040 updates the data cache during write cycles from
* the CD2401 if there is a cache hit.
*/
pccchip2->SCC_error = 0x01;
pccchip2->SCC_modem_int_ctl = 0x10 | CD2401_INT_LEVEL;
pccchip2->SCC_tx_int_ctl = 0x10 | CD2401_INT_LEVEL;
pccchip2->SCC_rx_int_ctl = 0x50 | CD2401_INT_LEVEL;
pccchip2->gen_control |= 0x02; /* Enable pccchip2 interrupts */
}
else {
/* Disable interrupts */
pccchip2->SCC_modem_int_ctl &= 0xEF;
pccchip2->SCC_tx_int_ctl &= 0xEF;
pccchip2->SCC_rx_int_ctl &= 0xEF;
}
}
/* ISRs */
/*
* cd2401_modem_isr
*
* Modem/timer interrupt (group 1) from CD2401. These are not used, and not
* expected. Record as spurious and clear.
*
* Input parameters:
* vector - vector number
*
* Output parameters: NONE
*
* Return values: NONE
*/
rtems_isr cd2401_modem_isr(
rtems_vector_number vector
)
{
uint8_t ch;
/* Get interrupting channel ID */
ch = cd2401->licr >> 2;
/* Record interrupt info for debugging */
CD2401_Channel_Info[ch].spur_dev =
(vector << 24) | (cd2401->stk << 16) | (cd2401->mir << 8) | cd2401->misr;
CD2401_Channel_Info[ch].spur_cnt++;
cd2401->meoir = 0; /* EOI */
CD2401_RECORD_MODEM_ISR_SPURIOUS_INFO(( ch,
CD2401_Channel_Info[ch].spur_dev,
CD2401_Channel_Info[ch].spur_cnt ));
}
/*
* cd2401_re_isr
*
* RX exception interrupt (group 3, receiver exception) from CD2401. These are
* not used, and not expected. Record as spurious and clear.
*
* FIX THIS ISR TO DETECT BREAK CONDITIONS AND RAISE SIGINT
*
* Input parameters:
* vector - vector number
*
* Output parameters: NONE
*
* Return values: NONE
*/
rtems_isr cd2401_re_isr(
rtems_vector_number vector
)
{
uint8_t ch;
/* Get interrupting channel ID */
ch = cd2401->licr >> 2;
/* Record interrupt info for debugging */
CD2401_Channel_Info[ch].spur_dev =
(vector << 24) | (cd2401->stk << 16) | (cd2401->rir << 8) | cd2401->u5.b.risrl;
CD2401_Channel_Info[ch].spur_cnt++;
if ( cd2401->u5.b.risrl & 0x80 ) /* Timeout interrupt? */
cd2401->ier &= 0xDF; /* Disable rx timeout interrupt */
cd2401->reoir = 0x08; /* EOI; exception char not read */
CD2401_RECORD_RE_ISR_SPURIOUS_INFO(( ch,
CD2401_Channel_Info[ch].spur_dev,
CD2401_Channel_Info[ch].spur_cnt ));
}
/*
* cd2401_rx_isr
*
* RX interrupt (group 3, receiver data) from CD2401.
*
* Input parameters:
* vector - vector number
*
* Output parameters: NONE
*
* Return values: NONE
*/
rtems_isr cd2401_rx_isr(
rtems_vector_number vector
)
{
char c;
uint8_t ch, status, nchars, i, total;
char buffer[256];
status = cd2401->u5.b.risrl;
ch = cd2401->licr >> 2;
/* Has this channel been initialized or is it a condition we ignore? */
if ( CD2401_Channel_Info[ch].tty && !status ) {
/* Normal Rx Int, read chars, enqueue them, and issue EOI */
total = nchars = cd2401->rfoc; /* Nb of chars to retrieve from rx FIFO */
i = 0;
while ( nchars-- > 0 ) {
c = (char)cd2401->dr; /* Next char in rx FIFO */
rtems_termios_enqueue_raw_characters( CD2401_Channel_Info[ch].tty ,&c, 1 );
buffer[i++] = c;
}
cd2401->reoir = 0; /* EOI */
CD2401_RECORD_RX_ISR_INFO(( ch, total, buffer ));
} else {
/* No, record as spurious interrupt */
CD2401_Channel_Info[ch].spur_dev =
(vector << 24) | (cd2401->stk << 16) | (cd2401->rir << 8) | cd2401->u5.b.risrl;
CD2401_Channel_Info[ch].spur_cnt++;
cd2401->reoir = 0x04; /* EOI - character not read */
CD2401_RECORD_RX_ISR_SPURIOUS_INFO(( ch, status,
CD2401_Channel_Info[ch].spur_dev,
CD2401_Channel_Info[ch].spur_cnt ));
}
}
/*
* cd2401_tx_isr
*
* TX interrupt (group 2) from CD2401.
*
* Input parameters:
* vector - vector number
*
* Output parameters: NONE
*
* Return values: NONE
*/
rtems_isr cd2401_tx_isr(
rtems_vector_number vector
)
{
uint8_t ch, status, buserr, initial_ier, final_ier;
status = cd2401->tisr;
ch = cd2401->licr >> 2;
initial_ier = cd2401->ier;
/* Has this channel been initialized? */
if ( !CD2401_Channel_Info[ch].tty ) {
/* No, record as spurious interrupt */
CD2401_Channel_Info[ch].spur_dev =
(vector << 24) | (cd2401->stk << 16) | (cd2401->tir << 8) | cd2401->tisr;
CD2401_Channel_Info[ch].spur_cnt++;
final_ier = cd2401->ier &= 0xFC;/* Shut up, whoever you are */
cd2401->teoir = 0x88; /* EOI - Terminate buffer and no transfer */
CD2401_RECORD_TX_ISR_SPURIOUS_INFO(( ch, status, initial_ier, final_ier,
CD2401_Channel_Info[ch].spur_dev,
CD2401_Channel_Info[ch].spur_cnt ));
return;
}
if ( status & 0x80 ) {
/*
* Bus error occurred during DMA transfer. For now, just record.
* Get reason for DMA bus error and clear the report for the next
* occurrence
*/
buserr = pccchip2->SCC_error;
pccchip2->SCC_error = 0x01;
CD2401_Channel_Info[ch].buserr_type =
(vector << 24) | (buserr << 16) | (cd2401->tir << 8) | cd2401->tisr;
CD2401_Channel_Info[ch].buserr_addr =
(((uint32_t)cd2401->tcbadru) << 16) | cd2401->tcbadrl;
cd2401->teoir = 0x80; /* EOI - terminate bad buffer */
CD2401_RECORD_TX_ISR_BUSERR_INFO(( ch, status, initial_ier, buserr,
CD2401_Channel_Info[ch].buserr_type,
CD2401_Channel_Info[ch].buserr_addr ));
return;
}
if ( status & 0x20 ) {
/* DMA done -- Turn off TxD int, turn on TxMpty */
final_ier = cd2401->ier = (cd2401->ier & 0xFE) | 0x02;
if( status & 0x08 ) {
/* Transmit buffer B was released */
CD2401_Channel_Info[ch].own_buf_B = TRUE;
}
else {
/* Transmit buffer A was released */
CD2401_Channel_Info[ch].own_buf_A = TRUE;
}
CD2401_RECORD_TX_ISR_INFO(( ch, status, initial_ier, final_ier,
CD2401_Channel_Info[ch].txEmpty ));
/* This call can result in a call to cd2401_write() */
rtems_termios_dequeue_characters (
CD2401_Channel_Info[ch].tty,
CD2401_Channel_Info[ch].len );
cd2401->teoir = 0x08; /* EOI - no data transfered */
}
else if ( status & 0x02 ) {
/* TxEmpty */
CD2401_Channel_Info[ch].txEmpty = TRUE;
final_ier = cd2401->ier &= 0xFD;/* Shut up the interrupts */
cd2401->teoir = 0x08; /* EOI - no data transfered */
CD2401_RECORD_TX_ISR_INFO(( ch, status, initial_ier, final_ier,
CD2401_Channel_Info[ch].txEmpty ));
}
else {
/* Why did we get a Tx interrupt? */
CD2401_Channel_Info[ch].spur_dev =
(vector << 24) | (cd2401->stk << 16) | (cd2401->tir << 8) | cd2401->tisr;
CD2401_Channel_Info[ch].spur_cnt++;
cd2401->teoir = 0x08; /* EOI - no data transfered */
CD2401_RECORD_TX_ISR_SPURIOUS_INFO(( ch, status, initial_ier, 0xFF,
CD2401_Channel_Info[ch].spur_dev,
CD2401_Channel_Info[ch].spur_cnt ));
}
}
/*
* termios callbacks
*/
/*
* cd2401_firstOpen
*
* This is the first time that this minor device (channel) is opened.
* Complete the asynchronous initialization.
*
* Input parameters:
* major - device major number
* minor - channel number
* arg - pointer to a struct rtems_libio_open_close_args_t
*
* Output parameters: NONE
*
* Return value: IGNORED
*/
int cd2401_firstOpen(
int major,
int minor,
void *arg
)
{
rtems_libio_open_close_args_t *args = arg;
rtems_libio_ioctl_args_t newarg;
struct termios termios;
rtems_status_code sc;
rtems_interrupt_level level;
rtems_interrupt_disable (level);
/*
* Set up the line with the specified parameters. The difficulty is that
* the line parameters are stored in the struct termios field of a
* struct rtems_termios_tty that is not defined in a public header file.
* Therefore, we do not have direct access to the termios passed in with
* arg. So we make a rtems_termios_ioctl() call to get a pointer to the
* termios structure.
*
* THIS KLUDGE MAY BREAK IN THE FUTURE!
*
* We could have made a tcgetattr() call if we had our fd.
*/
newarg.iop = args->iop;
newarg.command = RTEMS_IO_GET_ATTRIBUTES;
newarg.buffer = &termios;
sc = rtems_termios_ioctl (&newarg);
if (sc != RTEMS_SUCCESSFUL)
rtems_fatal_error_occurred (sc);
/*
* Turn off hardware flow control. It is a pain with 3-wire cables.
* The rtems_termios_ioctl() call below results in a call to
* cd2401_setAttributes to initialize the line. The caller will "wait"
* on the ttyMutex that it already owns; this is safe in RTEMS.
*/
termios.c_cflag |= CLOCAL; /* Ignore modem status lines */
newarg.command = RTEMS_IO_SET_ATTRIBUTES;
sc = rtems_termios_ioctl (&newarg);
if (sc != RTEMS_SUCCESSFUL)
rtems_fatal_error_occurred (sc);
/* Mark that the channel as initialized */
CD2401_Channel_Info[minor].tty = args->iop->data1;
/* If the first of the four channels to open, set up the interrupts */
if ( !Init_count++ ) {
/* Install the interrupt handlers */
Prev_re_isr = (rtems_isr_entry) set_vector( cd2401_re_isr, 0x5C, 1 );
Prev_modem_isr = (rtems_isr_entry) set_vector( cd2401_modem_isr, 0x5D, 1 );
Prev_tx_isr = (rtems_isr_entry) set_vector( cd2401_tx_isr, 0x5E, 1 );
Prev_rx_isr = (rtems_isr_entry) set_vector( cd2401_rx_isr, 0x5F, 1 );
cd2401_interrupts_initialize( TRUE );
}
CD2401_RECORD_FIRST_OPEN_INFO(( minor, Init_count ));
rtems_interrupt_enable (level);
/* Return something */
return RTEMS_SUCCESSFUL;
}
/*
* cd2401_lastClose
*
* There are no more opened file descriptors to this device. Close it down.
*
* Input parameters:
* major - device major number
* minor - channel number
* arg - pointer to a struct rtems_libio_open_close_args_t
*/
int cd2401_lastClose(
int major,
int minor,
void *arg
)
{
rtems_interrupt_level level;
rtems_interrupt_disable (level);
/* Mark that the channel is no longer is use */
CD2401_Channel_Info[minor].tty = NULL;
/* If the last of the four channels to close, disable the interrupts */
if ( !--Init_count ) {
cd2401_interrupts_initialize( FALSE );
/* De-install the interrupt handlers */
set_vector( Prev_re_isr, 0x5C, 1 );
set_vector( Prev_modem_isr, 0x5D, 1 );
set_vector( Prev_tx_isr, 0x5E, 1 );
set_vector( Prev_rx_isr, 0x5F, 1 );
}
CD2401_RECORD_LAST_CLOSE_INFO(( minor, Init_count ));
rtems_interrupt_enable (level);
/* return something */
return RTEMS_SUCCESSFUL;
}
/*
* cd2401_setAttributes
*
* Set up the selected channel of the CD2401 chip for doing asynchronous
* I/O with DMA.
*
* The chip must already have been initialized by cd2401_initialize().
*
* This code was written for clarity. The code space it occupies could be
* reduced. The code could also be compiled with aggressive optimization
* turned on.
*
* Input parameters:
* minor - the selected channel
* t - the termios parameters
*
* Output parameters: NONE
*
* Return value: IGNORED
*/
int cd2401_setAttributes(
int minor,
const struct termios *t
)
{
uint8_t csize, cstopb, parodd, parenb, ignpar, inpck;
uint8_t hw_flow_ctl, sw_flow_ctl, extra_flow_ctl;
uint8_t icrnl, igncr, inlcr, brkint, ignbrk, parmrk, istrip;
uint8_t need_reinitialization = FALSE;
uint8_t read_enabled;
uint16_t tx_period, rx_period;
uint32_t out_baud, in_baud;
rtems_interrupt_level level;
/* Determine what the line parameters should be */
/* baud rates */
out_baud = rtems_termios_baud_to_number(t->c_cflag & CBAUD);
in_baud = rtems_termios_baud_to_number(t->c_cflag & CBAUD);
/* Number of bits per char */
csize = 0x07; /* to avoid a warning */
switch ( t->c_cflag & CSIZE ) {
case CS5: csize = 0x04; break;
case CS6: csize = 0x05; break;
case CS7: csize = 0x06; break;
case CS8: csize = 0x07; break;
}
/* Parity */
if ( t->c_cflag & PARODD )
parodd = 0x80; /* Odd parity */
else
parodd = 0;
if ( t->c_cflag & PARENB )
parenb = 0x40; /* Parity enabled on Tx and Rx */
else
parenb = 0x00; /* No parity on Tx and Rx */
/* CD2401 IGNPAR and INPCK bits are inverted wrt POSIX standard? */
if ( t->c_iflag & INPCK )
ignpar = 0; /* Check parity on input */
else
ignpar = 0x10; /* Do not check parity on input */
if ( t->c_iflag & IGNPAR ) {
inpck = 0x03; /* Discard error character */
parmrk = 0;
} else {
if ( t->c_iflag & PARMRK ) {
inpck = 0x01; /* Translate to 0xFF 0x00 <char> */
parmrk = 0x04;
} else {
inpck = 0x01; /* Translate to 0x00 */
parmrk = 0;
}
}
/* Stop bits */
if ( t->c_cflag & CSTOPB )
cstopb = 0x04; /* Two stop bits */
else
cstopb = 0x02; /* One stop bit */
/* Modem flow control */
if ( t->c_cflag & CLOCAL )
hw_flow_ctl = 0x04; /* Always assert RTS before Tx */
else
hw_flow_ctl = 0x07; /* Always assert RTS before Tx,
wait for CTS and DSR */
/* XON/XOFF Tx flow control */
if ( t->c_iflag & IXON ) {
sw_flow_ctl = 0x40; /* Tx in-band flow ctl enabled, wait for XON */
extra_flow_ctl = 0x30; /* Eat XON/XOFF, XON/XOFF in SCHR1, SCHR2 */
}
else {
sw_flow_ctl = 0; /* Tx in-band flow ctl disabled */
extra_flow_ctl = 0; /* Pass on XON/XOFF */
}
/* CL/LF translation */
if ( t->c_iflag & ICRNL )
icrnl = 0x40; /* Map CR to NL on input */
else
icrnl = 0; /* Pass on CR */
if ( t->c_iflag & INLCR )
inlcr = 0x20; /* Map NL to CR on input */
else
inlcr = 0; /* Pass on NL */
if ( t->c_iflag & IGNCR )
igncr = 0x80; /* CR discarded on input */
else
igncr = 0;
/* Break handling */
if ( t->c_iflag & IGNBRK ) {
ignbrk = 0x10; /* Ignore break on input */
brkint = 0x08;
} else {
if ( t->c_iflag & BRKINT ) {
ignbrk = 0; /* Generate SIGINT (interrupt ) */
brkint = 0;
} else {
ignbrk = 0; /* Convert to 0x00 */
brkint = 0x08;
}
}
/* Stripping */
if ( t->c_iflag & ISTRIP )
istrip = 0x80; /* Strip to 7 bits */
else
istrip = 0; /* Leave as 8 bits */
rx_period = cd2401_bitrate_divisor( 20000000Ul, &in_baud );
tx_period = cd2401_bitrate_divisor( 20000000Ul, &out_baud );
/*
* If this is the first time that the line characteristics are set up, then
* the device must be re-initialized.
* Also check if we need to change anything. It is preferable to not touch
* the device if nothing changes. As soon as we touch it, it tends to
* glitch. If anything changes, we reprogram all registers. This is
* harmless.
*/
if ( ( CD2401_Channel_Info[minor].tty == 0 ) ||
( cd2401->cor1 != (parodd | parenb | ignpar | csize) ) ||
( cd2401->cor2 != (sw_flow_ctl | hw_flow_ctl) ) ||
( cd2401->cor3 != (extra_flow_ctl | cstopb) ) ||
( cd2401->cor6 != (igncr | icrnl | inlcr | ignbrk | brkint | parmrk | inpck) ) ||
( cd2401->cor7 != istrip ) ||
( cd2401->u1.async.schr1 != t->c_cc[VSTART] ) ||
( cd2401->u1.async.schr2 != t->c_cc[VSTOP] ) ||
( cd2401->rbpr != (unsigned char)rx_period ) ||
( cd2401->rcor != (unsigned char)(rx_period >> 8) ) ||
( cd2401->tbpr != (unsigned char)tx_period ) ||
( cd2401->tcor != ( (tx_period >> 3) & 0xE0 ) ) )
need_reinitialization = TRUE;
/* Write to the ports */
rtems_interrupt_disable (level);
cd2401->car = minor; /* Select channel */
read_enabled = cd2401->csr & 0x80 ? TRUE : FALSE;
if ( (t->c_cflag & CREAD ? TRUE : FALSE ) != read_enabled ) {
/* Read enable status is changing */
need_reinitialization = TRUE;
}
if ( need_reinitialization ) {
/*
* Could not find a way to test whether the CD2401 was done transmitting.
* The TxEmpty interrupt does not seem to indicate that the FIFO is empty
* in DMA mode. So, just wait a while for output to drain. May not be
* enough, but it will have to do (should be long enough for 1 char at
* 9600 bsp)...
*/
cd2401_udelay( 2000L );
/* Clear channel */
cd2401_chan_cmd (minor, 0x40, 1);
cd2401->car = minor; /* Select channel */
cd2401->cmr = 0x42; /* Interrupt Rx, DMA Tx, async mode */
cd2401->cor1 = parodd | parenb | ignpar | csize;
cd2401->cor2 = sw_flow_ctl | hw_flow_ctl;
cd2401->cor3 = extra_flow_ctl | cstopb;
cd2401->cor4 = 0x0A; /* No DSR/DCD/CTS detect; FIFO threshold of 10 */
cd2401->cor5 = 0x0A; /* No DSR/DCD/CTS detect; DTR threshold of 10 */
cd2401->cor6 = igncr | icrnl | inlcr | ignbrk | brkint | parmrk | inpck;
cd2401->cor7 = istrip; /* No LNext; ignore XON/XOFF if frame error; no tx translations */
/* Special char 1: XON character */
cd2401->u1.async.schr1 = t->c_cc[VSTART];
/* special char 2: XOFF character */
cd2401->u1.async.schr2 = t->c_cc[VSTOP];
/*
* Special chars 3 and 4, char range, LNext, RFAR[1..4] and CRC
* are unused, left as is.
*/
/* Set baudrates for receiver and transmitter */
cd2401->rbpr = (unsigned char)rx_period;
cd2401->rcor = (unsigned char)(rx_period >> 8); /* no DPLL */
cd2401->tbpr = (unsigned char)tx_period;
cd2401->tcor = (tx_period >> 3) & 0xE0; /* no x1 ext clk, no loopback */
/* Timeout for 4 chars at 9600, 8 bits per char, 1 stop bit */
cd2401->u2.w.rtpr = 0x04; /* NEED TO LOOK AT THIS LINE! */
if ( t->c_cflag & CREAD ) {
/* Re-initialize channel, enable rx and tx */
cd2401_chan_cmd (minor, 0x2A, 1);
/* Enable rx data ints */
cd2401->ier = 0x08;
} else {
/* Re-initialize channel, enable tx, disable rx */
cd2401_chan_cmd (minor, 0x29, 1);
}
}
CD2401_RECORD_SET_ATTRIBUTES_INFO(( minor, need_reinitialization, csize,
cstopb, parodd, parenb, ignpar, inpck,
hw_flow_ctl, sw_flow_ctl, extra_flow_ctl,
icrnl, igncr, inlcr, brkint, ignbrk,
parmrk, istrip, tx_period, rx_period,
out_baud, in_baud ));
rtems_interrupt_enable (level);
/*
* Looks like the CD2401 needs time to settle after initialization. Give it
* 10 ms. I don't really believe it, but if output resumes to quickly after
* this call, the first few characters are not right.
*/
if ( need_reinitialization )
cd2401_udelay( 10000L );
/* Return something */
return RTEMS_SUCCESSFUL;
}
/*
* cd2401_startRemoreTx
*
* Defined as a callback, but it would appear that it is never called. The
* POSIX standard states that when the tcflow() function is called with the
* TCION action, the system wall transmit a START character. Presumably,
* tcflow() is called internally when IXOFF is set in the termios c_iflag
* field when the input buffer can accomodate enough characters. It should
* probably be called from fillBufferQueue(). Clearly, the function is also
* explicitly callable by user code. The action is clearly to send the START
* character, regardless of whether START/STOP flow control is in effect.
*
* Input parameters:
* minor - selected channel
*
* Output parameters: NONE
*
* Return value: IGNORED
*
* PROPER START CHARACTER MUST BE PROGRAMMED IN SCHR1.
*/
int cd2401_startRemoteTx(
int minor
)
{
rtems_interrupt_level level;
rtems_interrupt_disable (level);
cd2401->car = minor; /* Select channel */
cd2401->stcr = 0x01; /* Send SCHR1 ahead of chars in FIFO */
CD2401_RECORD_START_REMOTE_TX_INFO(( minor ));
rtems_interrupt_enable (level);
/* Return something */
return RTEMS_SUCCESSFUL;
}
/*
* cd2401_stopRemoteTx
*
* Defined as a callback, but it would appear that it is never called. The
* POSIX standard states that when the tcflow() function is called with the
* TCIOFF function, the system wall transmit a STOP character. Presumably,
* tcflow() is called internally when IXOFF is set in the termios c_iflag
* field as the input buffer is about to overflow. It should probably be
* called from rtems_termios_enqueue_raw_characters(). Clearly, the function
* is also explicitly callable by user code. The action is clearly to send
* the STOP character, regardless of whether START/STOP flow control is in
* effect.
*
* Input parameters:
* minor - selected channel
*
* Output parameters: NONE
*
* Return value: IGNORED
*
* PROPER STOP CHARACTER MUST BE PROGRAMMED IN SCHR2.
*/
int cd2401_stopRemoteTx(
int minor
)
{
rtems_interrupt_level level;
rtems_interrupt_disable (level);
cd2401->car = minor; /* Select channel */
cd2401->stcr = 0x02; /* Send SCHR2 ahead of chars in FIFO */
CD2401_RECORD_STOP_REMOTE_TX_INFO(( minor ));
rtems_interrupt_enable (level);
/* Return something */
return RTEMS_SUCCESSFUL;
}
/*
* cd2401_write
*
* Initiate DMA output. Termios guarantees that the buffer does not wrap
* around, so we can do DMA strait from the supplied buffer.
*
* Input parameters:
* minor - selected channel
* buf - output buffer
* len - number of chars to output
*
* Output parameters: NONE
*
* Return value: IGNORED
*
* MUST BE EXECUTED WITH THE CD2401 INTERRUPTS DISABLED!
* The processor is placed at interrupt level CD2401_INT_LEVEL explicitly in
* console_write(). The processor is necessarily at interrupt level 1 in
* cd2401_tx_isr().
*/
ssize_t cd2401_write(
int minor,
const char *buf,
size_t len
)
{
cd2401->car = minor; /* Select channel */
if ( (cd2401->dmabsts & 0x08) == 0 ) {
/* Next buffer is A. Wait for it to be ours. */
while ( cd2401->atbsts & 0x01 );
CD2401_Channel_Info[minor].own_buf_A = FALSE;
CD2401_Channel_Info[minor].len = len;
CD2401_Channel_Info[minor].buf = buf;
cd2401->atbadru = (uint16_t)( ( (uint32_t) buf ) >> 16 );
cd2401->atbadrl = (uint16_t)( (uint32_t) buf );
cd2401->atbcnt = len;
CD2401_RECORD_WRITE_INFO(( len, buf, 'A' ));
cd2401->atbsts = 0x03; /* CD2401 owns buffer, int when empty */
}
else {
/* Next buffer is B. Wait for it to be ours. */
while ( cd2401->btbsts & 0x01 );
CD2401_Channel_Info[minor].own_buf_B = FALSE;
CD2401_Channel_Info[minor].len = len;
CD2401_Channel_Info[minor].buf = buf;
cd2401->btbadru = (uint16_t)( ( (uint32_t) buf ) >> 16 );
cd2401->btbadrl = (uint16_t)( (uint32_t) buf );
cd2401->btbcnt = len;
CD2401_RECORD_WRITE_INFO(( len, buf, 'B' ));
cd2401->btbsts = 0x03; /* CD2401 owns buffer, int when empty */
}
/* Nuts -- Need TxD ints */
CD2401_Channel_Info[minor].txEmpty = FALSE;
cd2401->ier |= 0x01;
/* Return something */
return len;
}
#if 0
/*
* cd2401_drainOutput
*
* Wait for the txEmpty indication on the specified channel.
*
* Input parameters:
* minor - selected channel
*
* Output parameters: NONE
*
* Return value: IGNORED
*
* MUST NOT BE EXECUTED WITH THE CD2401 INTERRUPTS DISABLED!
* The txEmpty flag is set by the tx ISR.
*
* DOES NOT WORK! DO NOT ENABLE THIS CODE. THE CD2401 DOES NOT COOPERATE!
* The code is here to document that the output FIFO is NOT empty when
* the CD2401 reports that the Tx buffer is empty.
*/
int cd2401_drainOutput(
int minor
)
{
CD2401_RECORD_DRAIN_OUTPUT_INFO(( CD2401_Channel_Info[minor].txEmpty,
CD2401_Channel_Info[minor].own_buf_A,
CD2401_Channel_Info[minor].own_buf_B ));
while( ! (CD2401_Channel_Info[minor].txEmpty &&
CD2401_Channel_Info[minor].own_buf_A &&
CD2401_Channel_Info[minor].own_buf_B) );
/* Return something */
return RTEMS_SUCCESSFUL;
}
#endif
/*
* _167Bug_pollRead
*
* Read a character from the 167Bug console, and return it. Return -1
* if there is no character in the input FIFO.
*
* Input parameters:
* minor - selected channel
*
* Output parameters: NONE
*
* Return value: char returned as positive signed int
* -1 if no character is present in the input FIFO.
*
* CANNOT BE COMBINED WITH INTERRUPT DRIVEN I/O!
*/
int _167Bug_pollRead(
int minor
)
{
int char_not_available;
unsigned char c;
rtems_interrupt_level previous_level;
/*
* Redirection of .INSTAT does not work: 167-Bug crashes.
* Switch the input stream to the specified port.
* Make sure this is atomic code.
*/
rtems_interrupt_disable( previous_level );
asm volatile( "movew %1, -(%%sp)\n\t"/* Channel */
"trap #15\n\t" /* Trap to 167Bug */
".short 0x61\n\t" /* Code for .REDIR_I */
"trap #15\n\t" /* Trap to 167Bug */
".short 0x01\n\t" /* Code for .INSTAT */
"move %%cc, %0\n\t" /* Get condition codes */
"andil #4, %0" /* Keep the Zero bit */
: "=d" (char_not_available) : "d" (minor): "%%cc" );
if (char_not_available) {
rtems_interrupt_enable( previous_level );
return -1;
}
/* Read the char and return it */
asm volatile( "subq.l #2,%%a7\n\t" /* Space for result */
"trap #15\n\t" /* Trap to 167 Bug */
".short 0x00\n\t" /* Code for .INCHR */
"moveb (%%a7)+, %0" /* Pop char into c */
: "=d" (c) : );
rtems_interrupt_enable( previous_level );
return (int)c;
}
/*
* _167Bug_pollWrite
*
* Output buffer through 167Bug. Returns only once every character has been
* sent (polled output).
*
* Input parameters:
* minor - selected channel
* buf - output buffer
* len - number of chars to output
*
* Output parameters: NONE
*
* Return value: IGNORED
*
* CANNOT BE COMBINED WITH INTERRUPT DRIVEN I/O!
*/
ssize_t _167Bug_pollWrite(
int minor,
const char *buf,
size_t len
)
{
const char *endbuf = buf + len;
asm volatile( "pea (%0)\n\t" /* endbuf */
"pea (%1)\n\t" /* buf */
"movew #0x21, -(%%sp)\n\t" /* Code for .OUTSTR */
"movew %2, -(%%sp)\n\t" /* Channel */
"trap #15\n\t" /* Trap to 167Bug */
".short 0x60" /* Code for .REDIR */
:: "a" (endbuf), "a" (buf), "d" (minor) );
/* Return something */
return len;
}
/*
* do_poll_read
*
* Input characters through 167Bug. Returns has soon as a character has been
* received. Otherwise, if we wait for the number of requested characters, we
* could be here forever!
*
* CR is converted to LF on input. The terminal should not send a CR/LF pair
* when the return or enter key is pressed.
*
* Input parameters:
* major - ignored. Should be the major number for this driver.
* minor - selected channel.
* arg->buffer - where to put the received characters.
* arg->count - number of characters to receive before returning--Ignored.
*
* Output parameters:
* arg->bytes_moved - the number of characters read. Always 1.
*
* Return value: RTEMS_SUCCESSFUL
*
* CANNOT BE COMBINED WITH INTERRUPT DRIVEN I/O!
*/
rtems_status_code do_poll_read(
rtems_device_major_number major,
rtems_device_minor_number minor,
void * arg
)
{
rtems_libio_rw_args_t *rw_args = arg;
int c;
while( (c = _167Bug_pollRead (minor)) == -1 );
rw_args->buffer[0] = (uint8_t)c;
if( rw_args->buffer[0] == '\r' )
rw_args->buffer[0] = '\n';
rw_args->bytes_moved = 1;
return RTEMS_SUCCESSFUL;
}
/*
* do_poll_write
*
* Output characters through 167Bug. Returns only once every character has
* been sent.
*
* CR is transmitted AFTER a LF on output.
*
* Input parameters:
* major - ignored. Should be the major number for this driver.
* minor - selected channel
* arg->buffer - where to get the characters to transmit.
* arg->count - the number of characters to transmit before returning.
*
* Output parameters:
* arg->bytes_moved - the number of characters read
*
* Return value: RTEMS_SUCCESSFUL
*
* CANNOT BE COMBINED WITH INTERRUPT DRIVEN I/O!
*/
rtems_status_code do_poll_write(
rtems_device_major_number major,
rtems_device_minor_number minor,
void * arg
)
{
rtems_libio_rw_args_t *rw_args = arg;
uint32_t i;
for( i = 0; i < rw_args->count; i++ ) {
_167Bug_pollWrite(minor, &(rw_args->buffer[i]), 1);
if ( rw_args->buffer[i] == '\n' )
_167Bug_pollWrite(minor, &cr_char, 1);
}
rw_args->bytes_moved = i;
return RTEMS_SUCCESSFUL;
}
/*
* _BSP_output_char
*
* printk() function prototyped in bspIo.h. Does not use termios.
*/
void _BSP_output_char(char c)
{
rtems_device_minor_number printk_minor;
/*
* Can't rely on console_initialize having been called before this function
* is used.
*/
if ( NVRAM_CONFIGURE )
/* J1-4 is on, use NVRAM info for configuration */
printk_minor = (nvram->console_printk_port & 0x30) >> 4;
else
printk_minor = PRINTK_MINOR;
_167Bug_pollWrite(printk_minor, &c, 1);
if ( c == '\n' )
_167Bug_pollWrite(printk_minor, &cr_char, 1);
}
/*
***************
* BOILERPLATE *
***************
*
* All these functions are prototyped in rtems/c/src/lib/include/console.h.
*/
/*
* Initialize and register the device
*/
rtems_device_driver console_initialize(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *arg
)
{
rtems_status_code status;
rtems_device_minor_number console_minor;
/*
* Set up TERMIOS if needed
*/
if ( NVRAM_CONFIGURE ) {
/* J1-4 is on, use NVRAM info for configuration */
console_minor = nvram->console_printk_port & 0x03;
if ( nvram->console_mode & 0x01 )
/* termios */
rtems_termios_initialize ();
}
else {
console_minor = CONSOLE_MINOR;
#if CD2401_USE_TERMIOS == 1
rtems_termios_initialize ();
#endif
}
/*
* Do device-specific initialization
* Does not affect 167-Bug.
*/
cd2401_initialize ();
/*
* Register the devices
*/
status = rtems_io_register_name ("/dev/tty0", major, 0);
if (status != RTEMS_SUCCESSFUL)
rtems_fatal_error_occurred (status);
status = rtems_io_register_name ("/dev/tty1", major, 1);
if (status != RTEMS_SUCCESSFUL)
rtems_fatal_error_occurred (status);
status = rtems_io_register_name ("/dev/console", major, console_minor);
if (status != RTEMS_SUCCESSFUL)
rtems_fatal_error_occurred (status);
status = rtems_io_register_name ("/dev/tty2", major, 2);
if (status != RTEMS_SUCCESSFUL)
rtems_fatal_error_occurred (status);
status = rtems_io_register_name ("/dev/tty3", major, 3);
if (status != RTEMS_SUCCESSFUL)
rtems_fatal_error_occurred (status);
return RTEMS_SUCCESSFUL;
}
/*
* Open the device
*/
rtems_device_driver console_open(
rtems_device_major_number major,
rtems_device_minor_number minor,
void * arg
)
{
static const rtems_termios_callbacks pollCallbacks = {
NULL, /* firstOpen */
NULL, /* lastClose */
_167Bug_pollRead, /* pollRead */
_167Bug_pollWrite, /* write */
NULL, /* setAttributes */
NULL, /* stopRemoteTx */
NULL, /* startRemoteTx */
0 /* outputUsesInterrupts */
};
static const rtems_termios_callbacks intrCallbacks = {
cd2401_firstOpen, /* firstOpen */
cd2401_lastClose, /* lastClose */
NULL, /* pollRead */
cd2401_write, /* write */
cd2401_setAttributes, /* setAttributes */
cd2401_stopRemoteTx, /* stopRemoteTx */
cd2401_startRemoteTx, /* startRemoteTx */
1 /* outputUsesInterrupts */
};
if ( NVRAM_CONFIGURE )
/* J1-4 is on, use NVRAM info for configuration */
if ( nvram->console_mode & 0x01 )
/* termios */
if ( nvram->console_mode & 0x02 )
/* interrupt-driven I/O */
return rtems_termios_open (major, minor, arg, &intrCallbacks);
else
/* polled I/O */
return rtems_termios_open (major, minor, arg, &pollCallbacks);
else
/* no termios -- default to polled I/O */
return RTEMS_SUCCESSFUL;
#if CD2401_USE_TERMIOS == 1
#if CD2401_IO_MODE != 1
else
/* termios & polled I/O*/
return rtems_termios_open (major, minor, arg, &pollCallbacks);
#else
else
/* termios & interrupt-driven I/O*/
return rtems_termios_open (major, minor, arg, &intrCallbacks);
#endif
#else
else
/* no termios -- default to polled I/O */
return RTEMS_SUCCESSFUL;
#endif
}
/*
* Close the device
*/
rtems_device_driver console_close(
rtems_device_major_number major,
rtems_device_minor_number minor,
void * arg
)
{
if ( NVRAM_CONFIGURE ) {
/* J1-4 is on, use NVRAM info for configuration */
if ( nvram->console_mode & 0x01 )
/* termios */
return rtems_termios_close (arg);
else
/* no termios */
return RTEMS_SUCCESSFUL;
}
#if CD2401_USE_TERMIOS == 1
else
/* termios */
return rtems_termios_close (arg);
#else
else
/* no termios */
return RTEMS_SUCCESSFUL;
#endif
}
/*
* Read from the device
*/
rtems_device_driver console_read(
rtems_device_major_number major,
rtems_device_minor_number minor,
void * arg
)
{
if ( NVRAM_CONFIGURE ) {
/* J1-4 is on, use NVRAM info for configuration */
if ( nvram->console_mode & 0x01 )
/* termios */
return rtems_termios_read (arg);
else
/* no termios -- default to polled */
return do_poll_read (major, minor, arg);
}
#if CD2401_USE_TERMIOS == 1
else
/* termios */
return rtems_termios_read (arg);
#else
else
/* no termios -- default to polled */
return do_poll_read (major, minor, arg);
#endif
}
/*
* Write to the device
*/
rtems_device_driver console_write(
rtems_device_major_number major,
rtems_device_minor_number minor,
void * arg
)
{
if ( NVRAM_CONFIGURE ) {
/* J1-4 is on, use NVRAM info for configuration */
if ( nvram->console_mode & 0x01 )
/* termios */
return rtems_termios_write (arg);
else
/* no termios -- default to polled */
return do_poll_write (major, minor, arg);
}
#if CD2401_USE_TERMIOS == 1
else
/* termios */
return rtems_termios_write (arg);
#else
else
/* no termios -- default to polled */
return do_poll_write (major, minor, arg);
#endif
}
/*
* Handle ioctl request.
*/
rtems_device_driver console_control(
rtems_device_major_number major,
rtems_device_minor_number minor,
void * arg
)
{
if ( NVRAM_CONFIGURE ) {
/* J1-4 is on, use NVRAM info for configuration */
if ( nvram->console_mode & 0x01 )
/* termios */
return rtems_termios_ioctl (arg);
else
/* no termios -- default to polled */
return RTEMS_SUCCESSFUL;
}
#if CD2401_USE_TERMIOS == 1
else
/* termios */
return rtems_termios_ioctl (arg);
#else
else
/* no termios -- default to polled */
return RTEMS_SUCCESSFUL;
#endif
}
