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.
13 #include <asm/serial.h>
15 #ifndef SERIAL_PORT_DFNS
16 #define SERIAL_PORT_DFNS
19 static void start_serial_interrupt(int irq);
21 static const struct old_serial_port rs_table[] = {
25 static const struct old_serial_port *serstate;
28 static int spk_serial_out(struct spk_synth *in_synth, const char ch);
29 static void spk_serial_send_xchar(char ch);
30 static void spk_serial_tiocmset(unsigned int set, unsigned int clear);
31 static unsigned char spk_serial_in(void);
32 static unsigned char spk_serial_in_nowait(void);
33 static void spk_serial_flush_buffer(void);
35 struct spk_io_ops spk_serial_io_ops = {
36 .synth_out = spk_serial_out,
37 .send_xchar = spk_serial_send_xchar,
38 .tiocmset = spk_serial_tiocmset,
39 .synth_in = spk_serial_in,
40 .synth_in_nowait = spk_serial_in_nowait,
41 .flush_buffer = spk_serial_flush_buffer,
43 EXPORT_SYMBOL_GPL(spk_serial_io_ops);
45 const struct old_serial_port *spk_serial_init(int index)
47 int baud = 9600, quot = 0;
48 unsigned int cval = 0;
49 int cflag = CREAD | HUPCL | CLOCAL | B9600 | CS8;
50 const struct old_serial_port *ser;
53 if (index >= ARRAY_SIZE(rs_table)) {
54 pr_info("no port info for ttyS%d\n", index);
57 ser = rs_table + index;
59 /* Divisor, bytesize and parity */
60 quot = ser->baud_base / baud;
61 cval = cflag & (CSIZE | CSTOPB);
62 #if defined(__powerpc__) || defined(__alpha__)
64 #else /* !__powerpc__ && !__alpha__ */
66 #endif /* !__powerpc__ && !__alpha__ */
68 cval |= UART_LCR_PARITY;
69 if (!(cflag & PARODD))
70 cval |= UART_LCR_EPAR;
71 if (synth_request_region(ser->port, 8)) {
72 /* try to take it back. */
73 pr_info("Ports not available, trying to steal them\n");
74 __release_region(&ioport_resource, ser->port, 8);
75 err = synth_request_region(ser->port, 8);
77 pr_warn("Unable to allocate port at %x, errno %i",
83 /* Disable UART interrupts, set DTR and RTS high
86 outb(cval | UART_LCR_DLAB, ser->port + UART_LCR); /* set DLAB */
87 outb(quot & 0xff, ser->port + UART_DLL); /* LS of divisor */
88 outb(quot >> 8, ser->port + UART_DLM); /* MS of divisor */
89 outb(cval, ser->port + UART_LCR); /* reset DLAB */
91 /* Turn off Interrupts */
92 outb(0, ser->port + UART_IER);
93 outb(UART_MCR_DTR | UART_MCR_RTS, ser->port + UART_MCR);
95 /* If we read 0xff from the LSR, there is no UART here. */
96 if (inb(ser->port + UART_LSR) == 0xff) {
97 synth_release_region(ser->port, 8);
103 speakup_info.port_tts = ser->port;
106 start_serial_interrupt(ser->irq);
111 static irqreturn_t synth_readbuf_handler(int irq, void *dev_id)
116 spin_lock_irqsave(&speakup_info.spinlock, flags);
117 while (inb_p(speakup_info.port_tts + UART_LSR) & UART_LSR_DR) {
118 c = inb_p(speakup_info.port_tts + UART_RX);
119 synth->read_buff_add((u_char)c);
121 spin_unlock_irqrestore(&speakup_info.spinlock, flags);
125 static void start_serial_interrupt(int irq)
129 if (!synth->read_buff_add)
132 rv = request_irq(irq, synth_readbuf_handler, IRQF_SHARED,
133 "serial", (void *)synth_readbuf_handler);
136 pr_err("Unable to request Speakup serial I R Q\n");
138 outb(UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2,
139 speakup_info.port_tts + UART_MCR);
140 /* Turn on Interrupts */
141 outb(UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI,
142 speakup_info.port_tts + UART_IER);
143 inb(speakup_info.port_tts + UART_LSR);
144 inb(speakup_info.port_tts + UART_RX);
145 inb(speakup_info.port_tts + UART_IIR);
146 inb(speakup_info.port_tts + UART_MSR);
147 outb(1, speakup_info.port_tts + UART_FCR); /* Turn FIFO On */
150 static void spk_serial_send_xchar(char ch)
152 int timeout = SPK_XMITR_TIMEOUT;
154 while (spk_serial_tx_busy()) {
159 outb(ch, speakup_info.port_tts);
162 static void spk_serial_tiocmset(unsigned int set, unsigned int clear)
164 int old = inb(speakup_info.port_tts + UART_MCR);
166 outb((old & ~clear) | set, speakup_info.port_tts + UART_MCR);
169 int spk_serial_synth_probe(struct spk_synth *synth)
171 const struct old_serial_port *ser;
174 if ((synth->ser >= SPK_LO_TTY) && (synth->ser <= SPK_HI_TTY)) {
175 ser = spk_serial_init(synth->ser);
179 outb_p(0, ser->port);
181 outb_p('\r', ser->port);
185 pr_warn("ttyS%i is an invalid port\n", synth->ser);
188 pr_info("%s: not found\n", synth->long_name);
191 pr_info("%s: ttyS%i, Driver Version %s\n",
192 synth->long_name, synth->ser, synth->version);
196 EXPORT_SYMBOL_GPL(spk_serial_synth_probe);
198 void spk_stop_serial_interrupt(void)
200 if (speakup_info.port_tts == 0)
203 if (!synth->read_buff_add)
206 /* Turn off interrupts */
207 outb(0, speakup_info.port_tts + UART_IER);
209 free_irq(serstate->irq, (void *)synth_readbuf_handler);
211 EXPORT_SYMBOL_GPL(spk_stop_serial_interrupt);
213 int spk_wait_for_xmitr(struct spk_synth *in_synth)
215 int tmout = SPK_XMITR_TIMEOUT;
217 if ((in_synth->alive) && (timeouts >= NUM_DISABLE_TIMEOUTS)) {
218 pr_warn("%s: too many timeouts, deactivating speakup\n",
219 in_synth->long_name);
221 /* No synth any more, so nobody will restart TTYs, and we thus
222 * need to do it ourselves. Now that there is no synth we can
223 * let application flood anyway
225 speakup_start_ttys();
229 while (spk_serial_tx_busy()) {
231 pr_warn("%s: timed out (tx busy)\n",
232 in_synth->long_name);
238 tmout = SPK_CTS_TIMEOUT;
239 while (!((inb_p(speakup_info.port_tts + UART_MSR)) & UART_MSR_CTS)) {
251 static unsigned char spk_serial_in(void)
253 int tmout = SPK_SERIAL_TIMEOUT;
255 while (!(inb_p(speakup_info.port_tts + UART_LSR) & UART_LSR_DR)) {
257 pr_warn("time out while waiting for input.\n");
262 return inb_p(speakup_info.port_tts + UART_RX);
265 static unsigned char spk_serial_in_nowait(void)
269 lsr = inb_p(speakup_info.port_tts + UART_LSR);
270 if (!(lsr & UART_LSR_DR))
272 return inb_p(speakup_info.port_tts + UART_RX);
275 static void spk_serial_flush_buffer(void)
277 /* TODO: flush the UART 16550 buffer */
280 static int spk_serial_out(struct spk_synth *in_synth, const char ch)
282 if (in_synth->alive && spk_wait_for_xmitr(in_synth)) {
283 outb_p(ch, speakup_info.port_tts);
289 const char *spk_serial_synth_immediate(struct spk_synth *synth,
294 while ((ch = *buff)) {
296 ch = synth->procspeech;
297 if (spk_wait_for_xmitr(synth))
298 outb(ch, speakup_info.port_tts);
305 EXPORT_SYMBOL_GPL(spk_serial_synth_immediate);
307 void spk_serial_release(void)
309 spk_stop_serial_interrupt();
310 if (speakup_info.port_tts == 0)
312 synth_release_region(speakup_info.port_tts, 8);
313 speakup_info.port_tts = 0;
315 EXPORT_SYMBOL_GPL(spk_serial_release);