![Keerthimai Janarthanan](/assets/img/avatar_default.png)
Prefer pr_err instead of printk(KERN_ERR) Signed-off-by: Keerthimai Janarthanan <keerthimaipb@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
219 lines
5.2 KiB
C
219 lines
5.2 KiB
C
#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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#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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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 = rs_table + index;
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int err;
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/* Divisor, bytesize 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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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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/*printk(KERN_ERR "in irq\n"); */
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/*pr_warn("in IRQ\n"); */
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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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/*printk(KERN_ERR "c = %d\n", c); */
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/*pr_warn("C = %d\n", 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 == NULL)
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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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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 == NULL)
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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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int spk_wait_for_xmitr(void)
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{
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int tmout = SPK_XMITR_TIMEOUT;
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if ((synth->alive) && (timeouts >= NUM_DISABLE_TIMEOUTS)) {
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pr_warn("%s: too many timeouts, deactivating speakup\n",
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synth->long_name);
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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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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", 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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/* pr_warn("%s: timed out (cts)\n",
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* 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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timeouts = 0;
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return 1;
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}
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unsigned char spk_serial_in(void)
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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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EXPORT_SYMBOL_GPL(spk_serial_in);
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unsigned char spk_serial_in_nowait(void)
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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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EXPORT_SYMBOL_GPL(spk_serial_in_nowait);
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int spk_serial_out(const char ch)
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{
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if (synth->alive && spk_wait_for_xmitr()) {
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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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EXPORT_SYMBOL_GPL(spk_serial_out);
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void spk_serial_release(void)
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{
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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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