--- /dev/null
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+
+#include "spk_types.h"
+#include "speakup.h"
+#include "spk_priv.h"
+#include "serialio.h"
+
+static void start_serial_interrupt(int irq);
+
+static struct serial_state rs_table[] = {
+ SERIAL_PORT_DFNS
+};
+static struct serial_state *serstate;
+static int timeouts;
+
+struct serial_state *spk_serial_init(int index)
+{
+ int baud = 9600, quot = 0;
+ unsigned int cval = 0;
+ int cflag = CREAD | HUPCL | CLOCAL | B9600 | CS8;
+ struct serial_state *ser = NULL;
+ int err;
+
+ ser = rs_table + index;
+ /* Divisor, bytesize and parity */
+ quot = ser->baud_base / baud;
+ cval = cflag & (CSIZE | CSTOPB);
+#if defined(__powerpc__) || defined(__alpha__)
+ cval >>= 8;
+#else /* !__powerpc__ && !__alpha__ */
+ cval >>= 4;
+#endif /* !__powerpc__ && !__alpha__ */
+ if (cflag & PARENB)
+ cval |= UART_LCR_PARITY;
+ if (!(cflag & PARODD))
+ cval |= UART_LCR_EPAR;
+ if (synth_request_region(ser->port, 8)) {
+ /* try to take it back. */
+ printk(KERN_INFO "Ports not available, trying to steal them\n");
+ __release_region(&ioport_resource, ser->port, 8);
+ err = synth_request_region(ser->port, 8);
+ if (err) {
+ pr_warn("Unable to allocate port at %lx, errno %i",
+ ser->port, err);
+ return NULL;
+ }
+ }
+
+ /* Disable UART interrupts, set DTR and RTS high
+ * and set speed. */
+ outb(cval | UART_LCR_DLAB, ser->port + UART_LCR); /* set DLAB */
+ outb(quot & 0xff, ser->port + UART_DLL); /* LS of divisor */
+ outb(quot >> 8, ser->port + UART_DLM); /* MS of divisor */
+ outb(cval, ser->port + UART_LCR); /* reset DLAB */
+
+ /* Turn off Interrupts */
+ outb(0, ser->port + UART_IER);
+ outb(UART_MCR_DTR | UART_MCR_RTS, ser->port + UART_MCR);
+
+ /* If we read 0xff from the LSR, there is no UART here. */
+ if (inb(ser->port + UART_LSR) == 0xff) {
+ synth_release_region(ser->port, 8);
+ serstate = NULL;
+ return NULL;
+ }
+
+ mdelay(1);
+ speakup_info.port_tts = ser->port;
+ serstate = ser;
+
+ start_serial_interrupt(ser->irq);
+
+ return ser;
+}
+
+static irqreturn_t synth_readbuf_handler(int irq, void *dev_id)
+{
+ unsigned long flags;
+/*printk(KERN_ERR "in irq\n"); */
+/*pr_warn("in IRQ\n"); */
+ int c;
+ spk_lock(flags);
+ while (inb_p(speakup_info.port_tts + UART_LSR) & UART_LSR_DR) {
+
+ c = inb_p(speakup_info.port_tts+UART_RX);
+ synth->read_buff_add((u_char) c);
+/*printk(KERN_ERR "c = %d\n", c); */
+/*pr_warn("C = %d\n", c); */
+ }
+ spk_unlock(flags);
+ return IRQ_HANDLED;
+}
+
+static void start_serial_interrupt(int irq)
+{
+ int rv;
+
+ if (synth->read_buff_add == NULL)
+ return;
+
+ rv = request_irq(irq, synth_readbuf_handler, IRQF_SHARED,
+ "serial", (void *) synth_readbuf_handler);
+
+ if (rv)
+ printk(KERN_ERR "Unable to request Speakup serial I R Q\n");
+ /* Set MCR */
+ outb(UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2,
+ speakup_info.port_tts + UART_MCR);
+ /* Turn on Interrupts */
+ outb(UART_IER_MSI|UART_IER_RLSI|UART_IER_RDI,
+ speakup_info.port_tts + UART_IER);
+ inb(speakup_info.port_tts+UART_LSR);
+ inb(speakup_info.port_tts+UART_RX);
+ inb(speakup_info.port_tts+UART_IIR);
+ inb(speakup_info.port_tts+UART_MSR);
+ outb(1, speakup_info.port_tts + UART_FCR); /* Turn FIFO On */
+}
+
+void stop_serial_interrupt(void)
+{
+ if (speakup_info.port_tts == 0)
+ return;
+
+ if (synth->read_buff_add == NULL)
+ return;
+
+ /* Turn off interrupts */
+ outb(0, speakup_info.port_tts+UART_IER);
+ /* Free IRQ */
+ free_irq(serstate->irq, (void *) synth_readbuf_handler);
+}
+
+int wait_for_xmitr(void)
+{
+ int tmout = SPK_XMITR_TIMEOUT;
+ if ((synth->alive) && (timeouts >= NUM_DISABLE_TIMEOUTS)) {
+ pr_warn("%s: too many timeouts, deactivating speakup\n",
+ synth->long_name);
+ synth->alive = 0;
+ /* No synth any more, so nobody will restart TTYs, and we thus
+ * need to do it ourselves. Now that there is no synth we can
+ * let application flood anyway */
+ speakup_start_ttys();
+ timeouts = 0;
+ return 0;
+ }
+ while (spk_serial_tx_busy()) {
+ if (--tmout == 0) {
+ pr_warn("%s: timed out (tx busy)\n", synth->long_name);
+ timeouts++;
+ return 0;
+ }
+ udelay(1);
+ }
+ tmout = SPK_CTS_TIMEOUT;
+ while (!((inb_p(speakup_info.port_tts + UART_MSR)) & UART_MSR_CTS)) {
+ /* CTS */
+ if (--tmout == 0) {
+ /* pr_warn("%s: timed out (cts)\n",
+ * synth->long_name); */
+ timeouts++;
+ return 0;
+ }
+ udelay(1);
+ }
+ timeouts = 0;
+ return 1;
+}
+
+unsigned char spk_serial_in(void)
+{
+ int tmout = SPK_SERIAL_TIMEOUT;
+
+ while (!(inb_p(speakup_info.port_tts + UART_LSR) & UART_LSR_DR)) {
+ if (--tmout == 0) {
+ pr_warn("time out while waiting for input.\n");
+ return 0xff;
+ }
+ udelay(1);
+ }
+ return inb_p(speakup_info.port_tts + UART_RX);
+}
+EXPORT_SYMBOL_GPL(spk_serial_in);
+
+unsigned char spk_serial_in_nowait(void)
+{
+ unsigned char lsr;
+
+ lsr = inb_p(speakup_info.port_tts + UART_LSR);
+ if (!(lsr & UART_LSR_DR))
+ return 0;
+ return inb_p(speakup_info.port_tts + UART_RX);
+}
+EXPORT_SYMBOL_GPL(spk_serial_in_nowait);
+
+int spk_serial_out(const char ch)
+{
+ if (synth->alive && wait_for_xmitr()) {
+ outb_p(ch, speakup_info.port_tts);
+ return 1;
+ }
+ return 0;
+}
+EXPORT_SYMBOL_GPL(spk_serial_out);
+
+void spk_serial_release(void)
+{
+ if (speakup_info.port_tts == 0)
+ return;
+ synth_release_region(speakup_info.port_tts, 8);
+ speakup_info.port_tts = 0;
+}
+EXPORT_SYMBOL_GPL(spk_serial_release);
+
projects / mv-sheeva.git / blobdiff