1 #include <linux/interrupt.h>
2 #include <linux/ioport.h>
9 #include <linux/serial_core.h>
10 /* WARNING: Do not change this to <linux/serial.h> without testing that
11 * SERIAL_PORT_DFNS does get defined to the appropriate value. */
12 #include <asm/serial.h>
14 #ifndef SERIAL_PORT_DFNS
15 #define SERIAL_PORT_DFNS
18 static void start_serial_interrupt(int irq);
20 static const struct old_serial_port rs_table[] = {
23 static const struct old_serial_port *serstate;
26 const struct old_serial_port *spk_serial_init(int index)
28 int baud = 9600, quot = 0;
29 unsigned int cval = 0;
30 int cflag = CREAD | HUPCL | CLOCAL | B9600 | CS8;
31 const struct old_serial_port *ser;
34 if (index >= ARRAY_SIZE(rs_table)) {
35 pr_info("no port info for ttyS%d\n", index);
38 ser = rs_table + index;
40 /* Divisor, bytesize and parity */
41 quot = ser->baud_base / baud;
42 cval = cflag & (CSIZE | CSTOPB);
43 #if defined(__powerpc__) || defined(__alpha__)
45 #else /* !__powerpc__ && !__alpha__ */
47 #endif /* !__powerpc__ && !__alpha__ */
49 cval |= UART_LCR_PARITY;
50 if (!(cflag & PARODD))
51 cval |= UART_LCR_EPAR;
52 if (synth_request_region(ser->port, 8)) {
53 /* try to take it back. */
54 pr_info("Ports not available, trying to steal them\n");
55 __release_region(&ioport_resource, ser->port, 8);
56 err = synth_request_region(ser->port, 8);
58 pr_warn("Unable to allocate port at %x, errno %i",
64 /* Disable UART interrupts, set DTR and RTS high
67 outb(cval | UART_LCR_DLAB, ser->port + UART_LCR); /* set DLAB */
68 outb(quot & 0xff, ser->port + UART_DLL); /* LS of divisor */
69 outb(quot >> 8, ser->port + UART_DLM); /* MS of divisor */
70 outb(cval, ser->port + UART_LCR); /* reset DLAB */
72 /* Turn off Interrupts */
73 outb(0, ser->port + UART_IER);
74 outb(UART_MCR_DTR | UART_MCR_RTS, ser->port + UART_MCR);
76 /* If we read 0xff from the LSR, there is no UART here. */
77 if (inb(ser->port + UART_LSR) == 0xff) {
78 synth_release_region(ser->port, 8);
84 speakup_info.port_tts = ser->port;
87 start_serial_interrupt(ser->irq);
92 static irqreturn_t synth_readbuf_handler(int irq, void *dev_id)
95 /*printk(KERN_ERR "in irq\n"); */
96 /*pr_warn("in IRQ\n"); */
99 spin_lock_irqsave(&speakup_info.spinlock, flags);
100 while (inb_p(speakup_info.port_tts + UART_LSR) & UART_LSR_DR) {
102 c = inb_p(speakup_info.port_tts+UART_RX);
103 synth->read_buff_add((u_char) c);
104 /*printk(KERN_ERR "c = %d\n", c); */
105 /*pr_warn("C = %d\n", c); */
107 spin_unlock_irqrestore(&speakup_info.spinlock, flags);
111 static void start_serial_interrupt(int irq)
115 if (!synth->read_buff_add)
118 rv = request_irq(irq, synth_readbuf_handler, IRQF_SHARED,
119 "serial", (void *) synth_readbuf_handler);
122 pr_err("Unable to request Speakup serial I R Q\n");
124 outb(UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2,
125 speakup_info.port_tts + UART_MCR);
126 /* Turn on Interrupts */
127 outb(UART_IER_MSI|UART_IER_RLSI|UART_IER_RDI,
128 speakup_info.port_tts + UART_IER);
129 inb(speakup_info.port_tts+UART_LSR);
130 inb(speakup_info.port_tts+UART_RX);
131 inb(speakup_info.port_tts+UART_IIR);
132 inb(speakup_info.port_tts+UART_MSR);
133 outb(1, speakup_info.port_tts + UART_FCR); /* Turn FIFO On */
136 void spk_stop_serial_interrupt(void)
138 if (speakup_info.port_tts == 0)
141 if (!synth->read_buff_add)
144 /* Turn off interrupts */
145 outb(0, speakup_info.port_tts+UART_IER);
147 free_irq(serstate->irq, (void *) synth_readbuf_handler);
150 int spk_wait_for_xmitr(void)
152 int tmout = SPK_XMITR_TIMEOUT;
154 if ((synth->alive) && (timeouts >= NUM_DISABLE_TIMEOUTS)) {
155 pr_warn("%s: too many timeouts, deactivating speakup\n",
158 /* No synth any more, so nobody will restart TTYs, and we thus
159 * need to do it ourselves. Now that there is no synth we can
160 * let application flood anyway
162 speakup_start_ttys();
166 while (spk_serial_tx_busy()) {
168 pr_warn("%s: timed out (tx busy)\n", synth->long_name);
174 tmout = SPK_CTS_TIMEOUT;
175 while (!((inb_p(speakup_info.port_tts + UART_MSR)) & UART_MSR_CTS)) {
178 /* pr_warn("%s: timed out (cts)\n",
190 unsigned char spk_serial_in(void)
192 int tmout = SPK_SERIAL_TIMEOUT;
194 while (!(inb_p(speakup_info.port_tts + UART_LSR) & UART_LSR_DR)) {
196 pr_warn("time out while waiting for input.\n");
201 return inb_p(speakup_info.port_tts + UART_RX);
203 EXPORT_SYMBOL_GPL(spk_serial_in);
205 unsigned char spk_serial_in_nowait(void)
209 lsr = inb_p(speakup_info.port_tts + UART_LSR);
210 if (!(lsr & UART_LSR_DR))
212 return inb_p(speakup_info.port_tts + UART_RX);
214 EXPORT_SYMBOL_GPL(spk_serial_in_nowait);
216 int spk_serial_out(const char ch)
218 if (synth->alive && spk_wait_for_xmitr()) {
219 outb_p(ch, speakup_info.port_tts);
224 EXPORT_SYMBOL_GPL(spk_serial_out);
226 void spk_serial_release(void)
228 if (speakup_info.port_tts == 0)
230 synth_release_region(speakup_info.port_tts, 8);
231 speakup_info.port_tts = 0;
233 EXPORT_SYMBOL_GPL(spk_serial_release);