1 #include <linux/interrupt.h>
2 #include <linux/ioport.h>
9 static void start_serial_interrupt(int irq);
11 static struct serial_state rs_table[] = {
14 static struct serial_state *serstate;
17 struct serial_state *spk_serial_init(int index)
19 int baud = 9600, quot = 0;
20 unsigned int cval = 0;
21 int cflag = CREAD | HUPCL | CLOCAL | B9600 | CS8;
22 struct serial_state *ser = NULL;
25 ser = rs_table + index;
26 /* Divisor, bytesize and parity */
27 quot = ser->baud_base / baud;
28 cval = cflag & (CSIZE | CSTOPB);
29 #if defined(__powerpc__) || defined(__alpha__)
31 #else /* !__powerpc__ && !__alpha__ */
33 #endif /* !__powerpc__ && !__alpha__ */
35 cval |= UART_LCR_PARITY;
36 if (!(cflag & PARODD))
37 cval |= UART_LCR_EPAR;
38 if (synth_request_region(ser->port, 8)) {
39 /* try to take it back. */
40 printk("Ports not available, trying to steal them\n");
41 __release_region(&ioport_resource, ser->port, 8);
42 err = synth_request_region(ser->port, 8);
44 pr_warn("Unable to allocate port at %x, errno %i", ser->port, err);
49 /* Disable UART interrupts, set DTR and RTS high
51 outb(cval | UART_LCR_DLAB, ser->port + UART_LCR); /* set DLAB */
52 outb(quot & 0xff, ser->port + UART_DLL); /* LS of divisor */
53 outb(quot >> 8, ser->port + UART_DLM); /* MS of divisor */
54 outb(cval, ser->port + UART_LCR); /* reset DLAB */
56 /* Turn off Interrupts */
57 outb(0, ser->port + UART_IER);
58 outb(UART_MCR_DTR | UART_MCR_RTS, ser->port + UART_MCR);
60 /* If we read 0xff from the LSR, there is no UART here. */
61 if (inb(ser->port + UART_LSR) == 0xff) {
62 synth_release_region(ser->port, 8);
68 speakup_info.port_tts = ser->port;
71 start_serial_interrupt(ser->irq);
76 static irqreturn_t synth_readbuf_handler(int irq, void *dev_id)
79 /*printk(KERN_ERR "in irq\n"); */
80 /*pr_warn("in IRQ\n"); */
83 while (inb_p(speakup_info.port_tts + UART_LSR) & UART_LSR_DR) {
85 c = inb_p(speakup_info.port_tts+UART_RX);
86 synth->read_buff_add((u_char) c);
87 /*printk(KERN_ERR "c = %d\n", c); */
88 /*pr_warn("C = %d\n", c); */
94 static void start_serial_interrupt(int irq)
98 if (synth->read_buff_add == NULL)
101 rv = request_irq(irq, synth_readbuf_handler, IRQF_SHARED,
102 "serial", (void *) synth_readbuf_handler);
105 printk(KERN_ERR "Unable to request Speakup serial I R Q\n");
107 outb(UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2,
108 speakup_info.port_tts + UART_MCR);
109 /* Turn on Interrupts */
110 outb(UART_IER_MSI|UART_IER_RLSI|UART_IER_RDI,
111 speakup_info.port_tts + UART_IER);
112 inb(speakup_info.port_tts+UART_LSR);
113 inb(speakup_info.port_tts+UART_RX);
114 inb(speakup_info.port_tts+UART_IIR);
115 inb(speakup_info.port_tts+UART_MSR);
116 outb(1, speakup_info.port_tts + UART_FCR); /* Turn FIFO On */
119 void stop_serial_interrupt(void)
121 if (speakup_info.port_tts == 0)
124 if (synth->read_buff_add == NULL)
127 /* Turn off interrupts */
128 outb(0, speakup_info.port_tts+UART_IER);
130 free_irq(serstate->irq, (void *) synth_readbuf_handler);
133 int wait_for_xmitr(void)
135 int tmout = SPK_XMITR_TIMEOUT;
136 if ((synth->alive) && (timeouts >= NUM_DISABLE_TIMEOUTS)) {
137 pr_warn("%s: too many timeouts, deactivating speakup\n", synth->long_name);
139 /* No synth any more, so nobody will restart TTYs, and we thus
140 * need to do it ourselves. Now that there is no synth we can
141 * let application flood anyway */
142 speakup_start_ttys();
146 while (spk_serial_tx_busy()) {
148 pr_warn("%s: timed out (tx busy)\n", synth->long_name);
154 tmout = SPK_CTS_TIMEOUT;
155 while (!((inb_p(speakup_info.port_tts + UART_MSR)) & UART_MSR_CTS)) {
158 // pr_warn("%s: timed out (cts)\n", synth->long_name);
168 unsigned char spk_serial_in(void)
170 int tmout = SPK_SERIAL_TIMEOUT;
172 while (!(inb_p(speakup_info.port_tts + UART_LSR) & UART_LSR_DR)) {
174 pr_warn("time out while waiting for input.\n");
179 return inb_p(speakup_info.port_tts + UART_RX);
181 EXPORT_SYMBOL_GPL(spk_serial_in);
183 unsigned char spk_serial_in_nowait(void)
187 lsr = inb_p(speakup_info.port_tts + UART_LSR);
188 if (!(lsr & UART_LSR_DR))
190 return inb_p(speakup_info.port_tts + UART_RX);
192 EXPORT_SYMBOL_GPL(spk_serial_in_nowait);
194 int spk_serial_out(const char ch)
196 if (synth->alive && wait_for_xmitr()) {
197 outb_p(ch, speakup_info.port_tts);
202 EXPORT_SYMBOL_GPL(spk_serial_out);
204 void spk_serial_release(void)
206 if (speakup_info.port_tts == 0)
208 synth_release_region(speakup_info.port_tts, 8);
209 speakup_info.port_tts = 0;
211 EXPORT_SYMBOL_GPL(spk_serial_release);