319 lines
7.9 KiB
C
319 lines
7.9 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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#include <linux/interrupt.h>
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#include <linux/ioport.h>
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#include "spk_types.h"
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#include "speakup.h"
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#include "spk_priv.h"
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#include "serialio.h"
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#include <linux/serial_core.h>
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/* WARNING: Do not change this to <linux/serial.h> without testing that
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* SERIAL_PORT_DFNS does get defined to the appropriate value.
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*/
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#include <asm/serial.h>
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#ifndef SERIAL_PORT_DFNS
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#define SERIAL_PORT_DFNS
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#endif
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static void start_serial_interrupt(int irq);
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static const struct old_serial_port rs_table[] = {
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SERIAL_PORT_DFNS
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};
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static const struct old_serial_port *serstate;
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static int timeouts;
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static int spk_serial_out(struct spk_synth *in_synth, const char ch);
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static void spk_serial_send_xchar(struct spk_synth *in_synth, char ch);
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static void spk_serial_tiocmset(struct spk_synth *in_synth, unsigned int set, unsigned int clear);
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static unsigned char spk_serial_in(struct spk_synth *in_synth);
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static unsigned char spk_serial_in_nowait(struct spk_synth *in_synth);
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static void spk_serial_flush_buffer(struct spk_synth *in_synth);
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static int spk_serial_wait_for_xmitr(struct spk_synth *in_synth);
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struct spk_io_ops spk_serial_io_ops = {
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.synth_out = spk_serial_out,
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.send_xchar = spk_serial_send_xchar,
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.tiocmset = spk_serial_tiocmset,
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.synth_in = spk_serial_in,
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.synth_in_nowait = spk_serial_in_nowait,
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.flush_buffer = spk_serial_flush_buffer,
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.wait_for_xmitr = spk_serial_wait_for_xmitr,
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};
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EXPORT_SYMBOL_GPL(spk_serial_io_ops);
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const struct old_serial_port *spk_serial_init(int index)
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{
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int baud = 9600, quot = 0;
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unsigned int cval = 0;
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int cflag = CREAD | HUPCL | CLOCAL | B9600 | CS8;
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const struct old_serial_port *ser;
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int err;
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if (index >= ARRAY_SIZE(rs_table)) {
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pr_info("no port info for ttyS%d\n", index);
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return NULL;
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}
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ser = rs_table + index;
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/* Divisor, byte size and parity */
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quot = ser->baud_base / baud;
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cval = cflag & (CSIZE | CSTOPB);
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#if defined(__powerpc__) || defined(__alpha__)
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cval >>= 8;
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#else /* !__powerpc__ && !__alpha__ */
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cval >>= 4;
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#endif /* !__powerpc__ && !__alpha__ */
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if (cflag & PARENB)
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cval |= UART_LCR_PARITY;
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if (!(cflag & PARODD))
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cval |= UART_LCR_EPAR;
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if (synth_request_region(ser->port, 8)) {
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/* try to take it back. */
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pr_info("Ports not available, trying to steal them\n");
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__release_region(&ioport_resource, ser->port, 8);
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err = synth_request_region(ser->port, 8);
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if (err) {
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pr_warn("Unable to allocate port at %x, errno %i",
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ser->port, err);
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return NULL;
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}
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}
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/* Disable UART interrupts, set DTR and RTS high
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* and set speed.
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*/
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outb(cval | UART_LCR_DLAB, ser->port + UART_LCR); /* set DLAB */
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outb(quot & 0xff, ser->port + UART_DLL); /* LS of divisor */
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outb(quot >> 8, ser->port + UART_DLM); /* MS of divisor */
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outb(cval, ser->port + UART_LCR); /* reset DLAB */
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/* Turn off Interrupts */
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outb(0, ser->port + UART_IER);
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outb(UART_MCR_DTR | UART_MCR_RTS, ser->port + UART_MCR);
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/* If we read 0xff from the LSR, there is no UART here. */
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if (inb(ser->port + UART_LSR) == 0xff) {
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synth_release_region(ser->port, 8);
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serstate = NULL;
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return NULL;
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}
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mdelay(1);
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speakup_info.port_tts = ser->port;
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serstate = ser;
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start_serial_interrupt(ser->irq);
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return ser;
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}
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static irqreturn_t synth_readbuf_handler(int irq, void *dev_id)
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{
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unsigned long flags;
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int c;
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spin_lock_irqsave(&speakup_info.spinlock, flags);
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while (inb_p(speakup_info.port_tts + UART_LSR) & UART_LSR_DR) {
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c = inb_p(speakup_info.port_tts + UART_RX);
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synth->read_buff_add((u_char)c);
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}
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spin_unlock_irqrestore(&speakup_info.spinlock, flags);
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return IRQ_HANDLED;
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}
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static void start_serial_interrupt(int irq)
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{
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int rv;
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if (!synth->read_buff_add)
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return;
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rv = request_irq(irq, synth_readbuf_handler, IRQF_SHARED,
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"serial", (void *)synth_readbuf_handler);
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if (rv)
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pr_err("Unable to request Speakup serial I R Q\n");
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/* Set MCR */
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outb(UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2,
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speakup_info.port_tts + UART_MCR);
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/* Turn on Interrupts */
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outb(UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI,
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speakup_info.port_tts + UART_IER);
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inb(speakup_info.port_tts + UART_LSR);
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inb(speakup_info.port_tts + UART_RX);
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inb(speakup_info.port_tts + UART_IIR);
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inb(speakup_info.port_tts + UART_MSR);
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outb(1, speakup_info.port_tts + UART_FCR); /* Turn FIFO On */
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}
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static void spk_serial_send_xchar(struct spk_synth *synth, char ch)
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{
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int timeout = SPK_XMITR_TIMEOUT;
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while (spk_serial_tx_busy()) {
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if (!--timeout)
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break;
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udelay(1);
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}
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outb(ch, speakup_info.port_tts);
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}
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static void spk_serial_tiocmset(struct spk_synth *in_synth, unsigned int set, unsigned int clear)
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{
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int old = inb(speakup_info.port_tts + UART_MCR);
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outb((old & ~clear) | set, speakup_info.port_tts + UART_MCR);
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}
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int spk_serial_synth_probe(struct spk_synth *synth)
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{
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const struct old_serial_port *ser;
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int failed = 0;
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if ((synth->ser >= SPK_LO_TTY) && (synth->ser <= SPK_HI_TTY)) {
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ser = spk_serial_init(synth->ser);
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if (!ser) {
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failed = -1;
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} else {
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outb_p(0, ser->port);
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mdelay(1);
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outb_p('\r', ser->port);
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}
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} else {
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failed = -1;
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pr_warn("ttyS%i is an invalid port\n", synth->ser);
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}
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if (failed) {
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pr_info("%s: not found\n", synth->long_name);
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return -ENODEV;
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}
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pr_info("%s: ttyS%i, Driver Version %s\n",
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synth->long_name, synth->ser, synth->version);
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synth->alive = 1;
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return 0;
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}
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EXPORT_SYMBOL_GPL(spk_serial_synth_probe);
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void spk_stop_serial_interrupt(void)
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{
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if (speakup_info.port_tts == 0)
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return;
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if (!synth->read_buff_add)
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return;
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/* Turn off interrupts */
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outb(0, speakup_info.port_tts + UART_IER);
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/* Free IRQ */
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free_irq(serstate->irq, (void *)synth_readbuf_handler);
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}
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EXPORT_SYMBOL_GPL(spk_stop_serial_interrupt);
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static int spk_serial_wait_for_xmitr(struct spk_synth *in_synth)
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{
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int tmout = SPK_XMITR_TIMEOUT;
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if ((in_synth->alive) && (timeouts >= NUM_DISABLE_TIMEOUTS)) {
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pr_warn("%s: too many timeouts, deactivating speakup\n",
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in_synth->long_name);
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in_synth->alive = 0;
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/* No synth any more, so nobody will restart TTYs, and we thus
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* need to do it ourselves. Now that there is no synth we can
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* let application flood anyway
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*/
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speakup_start_ttys();
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timeouts = 0;
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return 0;
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}
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while (spk_serial_tx_busy()) {
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if (--tmout == 0) {
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pr_warn("%s: timed out (tx busy)\n",
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in_synth->long_name);
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timeouts++;
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return 0;
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}
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udelay(1);
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}
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tmout = SPK_CTS_TIMEOUT;
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while (!((inb_p(speakup_info.port_tts + UART_MSR)) & UART_MSR_CTS)) {
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/* CTS */
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if (--tmout == 0) {
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timeouts++;
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return 0;
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}
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udelay(1);
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}
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timeouts = 0;
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return 1;
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}
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static unsigned char spk_serial_in(struct spk_synth *in_synth)
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{
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int tmout = SPK_SERIAL_TIMEOUT;
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while (!(inb_p(speakup_info.port_tts + UART_LSR) & UART_LSR_DR)) {
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if (--tmout == 0) {
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pr_warn("time out while waiting for input.\n");
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return 0xff;
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}
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udelay(1);
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}
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return inb_p(speakup_info.port_tts + UART_RX);
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}
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static unsigned char spk_serial_in_nowait(struct spk_synth *in_synth)
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{
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unsigned char lsr;
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lsr = inb_p(speakup_info.port_tts + UART_LSR);
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if (!(lsr & UART_LSR_DR))
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return 0;
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return inb_p(speakup_info.port_tts + UART_RX);
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}
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static void spk_serial_flush_buffer(struct spk_synth *in_synth)
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{
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/* TODO: flush the UART 16550 buffer */
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}
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static int spk_serial_out(struct spk_synth *in_synth, const char ch)
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{
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if (in_synth->alive && spk_serial_wait_for_xmitr(in_synth)) {
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outb_p(ch, speakup_info.port_tts);
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return 1;
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}
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return 0;
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}
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const char *spk_serial_synth_immediate(struct spk_synth *synth,
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const char *buff)
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{
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u_char ch;
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while ((ch = *buff)) {
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if (ch == '\n')
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ch = synth->procspeech;
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if (spk_serial_wait_for_xmitr(synth))
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outb(ch, speakup_info.port_tts);
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else
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return buff;
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buff++;
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}
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return NULL;
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}
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EXPORT_SYMBOL_GPL(spk_serial_synth_immediate);
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void spk_serial_release(struct spk_synth *synth)
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{
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spk_stop_serial_interrupt();
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if (speakup_info.port_tts == 0)
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return;
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synth_release_region(speakup_info.port_tts, 8);
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speakup_info.port_tts = 0;
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}
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EXPORT_SYMBOL_GPL(spk_serial_release);
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