1 #include <linux/interrupt.h>
2 #include <linux/ioport.h>
9 #ifndef SERIAL_PORT_DFNS
10 #define SERIAL_PORT_DFNS
13 static void start_serial_interrupt(int irq);
15 static const struct old_serial_port rs_table[] = {
18 static const struct old_serial_port *serstate;
21 const struct old_serial_port *spk_serial_init(int index)
23 int baud = 9600, quot = 0;
24 unsigned int cval = 0;
25 int cflag = CREAD | HUPCL | CLOCAL | B9600 | CS8;
26 const struct old_serial_port *ser = rs_table + index;
29 /* Divisor, bytesize and parity */
30 quot = ser->baud_base / baud;
31 cval = cflag & (CSIZE | CSTOPB);
32 #if defined(__powerpc__) || defined(__alpha__)
34 #else /* !__powerpc__ && !__alpha__ */
36 #endif /* !__powerpc__ && !__alpha__ */
38 cval |= UART_LCR_PARITY;
39 if (!(cflag & PARODD))
40 cval |= UART_LCR_EPAR;
41 if (synth_request_region(ser->port, 8)) {
42 /* try to take it back. */
43 pr_info("Ports not available, trying to steal them\n");
44 __release_region(&ioport_resource, ser->port, 8);
45 err = synth_request_region(ser->port, 8);
47 pr_warn("Unable to allocate port at %x, errno %i",
53 /* Disable UART interrupts, set DTR and RTS high
56 outb(cval | UART_LCR_DLAB, ser->port + UART_LCR); /* set DLAB */
57 outb(quot & 0xff, ser->port + UART_DLL); /* LS of divisor */
58 outb(quot >> 8, ser->port + UART_DLM); /* MS of divisor */
59 outb(cval, ser->port + UART_LCR); /* reset DLAB */
61 /* Turn off Interrupts */
62 outb(0, ser->port + UART_IER);
63 outb(UART_MCR_DTR | UART_MCR_RTS, ser->port + UART_MCR);
65 /* If we read 0xff from the LSR, there is no UART here. */
66 if (inb(ser->port + UART_LSR) == 0xff) {
67 synth_release_region(ser->port, 8);
73 speakup_info.port_tts = ser->port;
76 start_serial_interrupt(ser->irq);
81 static irqreturn_t synth_readbuf_handler(int irq, void *dev_id)
84 /*printk(KERN_ERR "in irq\n"); */
85 /*pr_warn("in IRQ\n"); */
88 spin_lock_irqsave(&speakup_info.spinlock, flags);
89 while (inb_p(speakup_info.port_tts + UART_LSR) & UART_LSR_DR) {
91 c = inb_p(speakup_info.port_tts+UART_RX);
92 synth->read_buff_add((u_char) c);
93 /*printk(KERN_ERR "c = %d\n", c); */
94 /*pr_warn("C = %d\n", c); */
96 spin_unlock_irqrestore(&speakup_info.spinlock, flags);
100 static void start_serial_interrupt(int irq)
104 if (!synth->read_buff_add)
107 rv = request_irq(irq, synth_readbuf_handler, IRQF_SHARED,
108 "serial", (void *) synth_readbuf_handler);
111 pr_err("Unable to request Speakup serial I R Q\n");
113 outb(UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2,
114 speakup_info.port_tts + UART_MCR);
115 /* Turn on Interrupts */
116 outb(UART_IER_MSI|UART_IER_RLSI|UART_IER_RDI,
117 speakup_info.port_tts + UART_IER);
118 inb(speakup_info.port_tts+UART_LSR);
119 inb(speakup_info.port_tts+UART_RX);
120 inb(speakup_info.port_tts+UART_IIR);
121 inb(speakup_info.port_tts+UART_MSR);
122 outb(1, speakup_info.port_tts + UART_FCR); /* Turn FIFO On */
125 void spk_stop_serial_interrupt(void)
127 if (speakup_info.port_tts == 0)
130 if (!synth->read_buff_add)
133 /* Turn off interrupts */
134 outb(0, speakup_info.port_tts+UART_IER);
136 free_irq(serstate->irq, (void *) synth_readbuf_handler);
139 int spk_wait_for_xmitr(void)
141 int tmout = SPK_XMITR_TIMEOUT;
143 if ((synth->alive) && (timeouts >= NUM_DISABLE_TIMEOUTS)) {
144 pr_warn("%s: too many timeouts, deactivating speakup\n",
147 /* No synth any more, so nobody will restart TTYs, and we thus
148 * need to do it ourselves. Now that there is no synth we can
149 * let application flood anyway
151 speakup_start_ttys();
155 while (spk_serial_tx_busy()) {
157 pr_warn("%s: timed out (tx busy)\n", synth->long_name);
163 tmout = SPK_CTS_TIMEOUT;
164 while (!((inb_p(speakup_info.port_tts + UART_MSR)) & UART_MSR_CTS)) {
167 /* pr_warn("%s: timed out (cts)\n",
179 unsigned char spk_serial_in(void)
181 int tmout = SPK_SERIAL_TIMEOUT;
183 while (!(inb_p(speakup_info.port_tts + UART_LSR) & UART_LSR_DR)) {
185 pr_warn("time out while waiting for input.\n");
190 return inb_p(speakup_info.port_tts + UART_RX);
192 EXPORT_SYMBOL_GPL(spk_serial_in);
194 unsigned char spk_serial_in_nowait(void)
198 lsr = inb_p(speakup_info.port_tts + UART_LSR);
199 if (!(lsr & UART_LSR_DR))
201 return inb_p(speakup_info.port_tts + UART_RX);
203 EXPORT_SYMBOL_GPL(spk_serial_in_nowait);
205 int spk_serial_out(const char ch)
207 if (synth->alive && spk_wait_for_xmitr()) {
208 outb_p(ch, speakup_info.port_tts);
213 EXPORT_SYMBOL_GPL(spk_serial_out);
215 void spk_serial_release(void)
217 if (speakup_info.port_tts == 0)
219 synth_release_region(speakup_info.port_tts, 8);
220 speakup_info.port_tts = 0;
222 EXPORT_SYMBOL_GPL(spk_serial_release);