1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/interrupt.h>
3 #include <linux/ioport.h>
10 #include <linux/serial_core.h>
11 /* WARNING: Do not change this to <linux/serial.h> without testing that
12 * SERIAL_PORT_DFNS does get defined to the appropriate value.
14 #include <asm/serial.h>
16 #ifndef SERIAL_PORT_DFNS
17 #define SERIAL_PORT_DFNS
20 static void start_serial_interrupt(int irq);
22 static const struct old_serial_port rs_table[] = {
26 static const struct old_serial_port *serstate;
29 static int spk_serial_out(struct spk_synth *in_synth, const char ch);
30 static void spk_serial_send_xchar(char ch);
31 static void spk_serial_tiocmset(unsigned int set, unsigned int clear);
32 static unsigned char spk_serial_in(void);
33 static unsigned char spk_serial_in_nowait(void);
34 static void spk_serial_flush_buffer(void);
36 struct spk_io_ops spk_serial_io_ops = {
37 .synth_out = spk_serial_out,
38 .send_xchar = spk_serial_send_xchar,
39 .tiocmset = spk_serial_tiocmset,
40 .synth_in = spk_serial_in,
41 .synth_in_nowait = spk_serial_in_nowait,
42 .flush_buffer = spk_serial_flush_buffer,
44 EXPORT_SYMBOL_GPL(spk_serial_io_ops);
46 const struct old_serial_port *spk_serial_init(int index)
48 int baud = 9600, quot = 0;
49 unsigned int cval = 0;
50 int cflag = CREAD | HUPCL | CLOCAL | B9600 | CS8;
51 const struct old_serial_port *ser;
54 if (index >= ARRAY_SIZE(rs_table)) {
55 pr_info("no port info for ttyS%d\n", index);
58 ser = rs_table + index;
60 /* Divisor, bytesize and parity */
61 quot = ser->baud_base / baud;
62 cval = cflag & (CSIZE | CSTOPB);
63 #if defined(__powerpc__) || defined(__alpha__)
65 #else /* !__powerpc__ && !__alpha__ */
67 #endif /* !__powerpc__ && !__alpha__ */
69 cval |= UART_LCR_PARITY;
70 if (!(cflag & PARODD))
71 cval |= UART_LCR_EPAR;
72 if (synth_request_region(ser->port, 8)) {
73 /* try to take it back. */
74 pr_info("Ports not available, trying to steal them\n");
75 __release_region(&ioport_resource, ser->port, 8);
76 err = synth_request_region(ser->port, 8);
78 pr_warn("Unable to allocate port at %x, errno %i",
84 /* Disable UART interrupts, set DTR and RTS high
87 outb(cval | UART_LCR_DLAB, ser->port + UART_LCR); /* set DLAB */
88 outb(quot & 0xff, ser->port + UART_DLL); /* LS of divisor */
89 outb(quot >> 8, ser->port + UART_DLM); /* MS of divisor */
90 outb(cval, ser->port + UART_LCR); /* reset DLAB */
92 /* Turn off Interrupts */
93 outb(0, ser->port + UART_IER);
94 outb(UART_MCR_DTR | UART_MCR_RTS, ser->port + UART_MCR);
96 /* If we read 0xff from the LSR, there is no UART here. */
97 if (inb(ser->port + UART_LSR) == 0xff) {
98 synth_release_region(ser->port, 8);
104 speakup_info.port_tts = ser->port;
107 start_serial_interrupt(ser->irq);
112 static irqreturn_t synth_readbuf_handler(int irq, void *dev_id)
117 spin_lock_irqsave(&speakup_info.spinlock, flags);
118 while (inb_p(speakup_info.port_tts + UART_LSR) & UART_LSR_DR) {
119 c = inb_p(speakup_info.port_tts + UART_RX);
120 synth->read_buff_add((u_char)c);
122 spin_unlock_irqrestore(&speakup_info.spinlock, flags);
126 static void start_serial_interrupt(int irq)
130 if (!synth->read_buff_add)
133 rv = request_irq(irq, synth_readbuf_handler, IRQF_SHARED,
134 "serial", (void *)synth_readbuf_handler);
137 pr_err("Unable to request Speakup serial I R Q\n");
139 outb(UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2,
140 speakup_info.port_tts + UART_MCR);
141 /* Turn on Interrupts */
142 outb(UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI,
143 speakup_info.port_tts + UART_IER);
144 inb(speakup_info.port_tts + UART_LSR);
145 inb(speakup_info.port_tts + UART_RX);
146 inb(speakup_info.port_tts + UART_IIR);
147 inb(speakup_info.port_tts + UART_MSR);
148 outb(1, speakup_info.port_tts + UART_FCR); /* Turn FIFO On */
151 static void spk_serial_send_xchar(char ch)
153 int timeout = SPK_XMITR_TIMEOUT;
155 while (spk_serial_tx_busy()) {
160 outb(ch, speakup_info.port_tts);
163 static void spk_serial_tiocmset(unsigned int set, unsigned int clear)
165 int old = inb(speakup_info.port_tts + UART_MCR);
167 outb((old & ~clear) | set, speakup_info.port_tts + UART_MCR);
170 int spk_serial_synth_probe(struct spk_synth *synth)
172 const struct old_serial_port *ser;
175 if ((synth->ser >= SPK_LO_TTY) && (synth->ser <= SPK_HI_TTY)) {
176 ser = spk_serial_init(synth->ser);
180 outb_p(0, ser->port);
182 outb_p('\r', ser->port);
186 pr_warn("ttyS%i is an invalid port\n", synth->ser);
189 pr_info("%s: not found\n", synth->long_name);
192 pr_info("%s: ttyS%i, Driver Version %s\n",
193 synth->long_name, synth->ser, synth->version);
197 EXPORT_SYMBOL_GPL(spk_serial_synth_probe);
199 void spk_stop_serial_interrupt(void)
201 if (speakup_info.port_tts == 0)
204 if (!synth->read_buff_add)
207 /* Turn off interrupts */
208 outb(0, speakup_info.port_tts + UART_IER);
210 free_irq(serstate->irq, (void *)synth_readbuf_handler);
212 EXPORT_SYMBOL_GPL(spk_stop_serial_interrupt);
214 int spk_wait_for_xmitr(struct spk_synth *in_synth)
216 int tmout = SPK_XMITR_TIMEOUT;
218 if ((in_synth->alive) && (timeouts >= NUM_DISABLE_TIMEOUTS)) {
219 pr_warn("%s: too many timeouts, deactivating speakup\n",
220 in_synth->long_name);
222 /* No synth any more, so nobody will restart TTYs, and we thus
223 * need to do it ourselves. Now that there is no synth we can
224 * let application flood anyway
226 speakup_start_ttys();
230 while (spk_serial_tx_busy()) {
232 pr_warn("%s: timed out (tx busy)\n",
233 in_synth->long_name);
239 tmout = SPK_CTS_TIMEOUT;
240 while (!((inb_p(speakup_info.port_tts + UART_MSR)) & UART_MSR_CTS)) {
252 static unsigned char spk_serial_in(void)
254 int tmout = SPK_SERIAL_TIMEOUT;
256 while (!(inb_p(speakup_info.port_tts + UART_LSR) & UART_LSR_DR)) {
258 pr_warn("time out while waiting for input.\n");
263 return inb_p(speakup_info.port_tts + UART_RX);
266 static unsigned char spk_serial_in_nowait(void)
270 lsr = inb_p(speakup_info.port_tts + UART_LSR);
271 if (!(lsr & UART_LSR_DR))
273 return inb_p(speakup_info.port_tts + UART_RX);
276 static void spk_serial_flush_buffer(void)
278 /* TODO: flush the UART 16550 buffer */
281 static int spk_serial_out(struct spk_synth *in_synth, const char ch)
283 if (in_synth->alive && spk_wait_for_xmitr(in_synth)) {
284 outb_p(ch, speakup_info.port_tts);
290 const char *spk_serial_synth_immediate(struct spk_synth *synth,
295 while ((ch = *buff)) {
297 ch = synth->procspeech;
298 if (spk_wait_for_xmitr(synth))
299 outb(ch, speakup_info.port_tts);
306 EXPORT_SYMBOL_GPL(spk_serial_synth_immediate);
308 void spk_serial_release(void)
310 spk_stop_serial_interrupt();
311 if (speakup_info.port_tts == 0)
313 synth_release_region(speakup_info.port_tts, 8);
314 speakup_info.port_tts = 0;
316 EXPORT_SYMBOL_GPL(spk_serial_release);