1 #include <linux/interrupt.h>
2 #include <linux/ioport.h>
3 
4 #include "spk_types.h"
5 #include "speakup.h"
6 #include "spk_priv.h"
7 #include "serialio.h"
8 
9 static void start_serial_interrupt(int irq);
10 
11 static const struct old_serial_port rs_table[] = {
12 	SERIAL_PORT_DFNS
13 };
14 static const struct old_serial_port *serstate;
15 static int timeouts;
16 
spk_serial_init(int index)17 const struct old_serial_port *spk_serial_init(int index)
18 {
19 	int baud = 9600, quot = 0;
20 	unsigned int cval = 0;
21 	int cflag = CREAD | HUPCL | CLOCAL | B9600 | CS8;
22 	const struct old_serial_port *ser = rs_table + index;
23 	int err;
24 
25 	/*	Divisor, bytesize and parity */
26 	quot = ser->baud_base / baud;
27 	cval = cflag & (CSIZE | CSTOPB);
28 #if defined(__powerpc__) || defined(__alpha__)
29 	cval >>= 8;
30 #else /* !__powerpc__ && !__alpha__ */
31 	cval >>= 4;
32 #endif /* !__powerpc__ && !__alpha__ */
33 	if (cflag & PARENB)
34 		cval |= UART_LCR_PARITY;
35 	if (!(cflag & PARODD))
36 		cval |= UART_LCR_EPAR;
37 	if (synth_request_region(ser->port, 8)) {
38 		/* try to take it back. */
39 		printk(KERN_INFO "Ports not available, trying to steal them\n");
40 		__release_region(&ioport_resource, ser->port, 8);
41 		err = synth_request_region(ser->port, 8);
42 		if (err) {
43 			pr_warn("Unable to allocate port at %x, errno %i",
44 				ser->port, err);
45 			return NULL;
46 		}
47 	}
48 
49 	/*	Disable UART interrupts, set DTR and RTS high
50 	 *	and set speed. */
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 */
55 
56 	/* Turn off Interrupts */
57 	outb(0, ser->port + UART_IER);
58 	outb(UART_MCR_DTR | UART_MCR_RTS, ser->port + UART_MCR);
59 
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);
63 		serstate = NULL;
64 		return NULL;
65 	}
66 
67 	mdelay(1);
68 	speakup_info.port_tts = ser->port;
69 	serstate = ser;
70 
71 	start_serial_interrupt(ser->irq);
72 
73 	return ser;
74 }
75 
synth_readbuf_handler(int irq,void * dev_id)76 static irqreturn_t synth_readbuf_handler(int irq, void *dev_id)
77 {
78 	unsigned long flags;
79 /*printk(KERN_ERR "in irq\n"); */
80 /*pr_warn("in IRQ\n"); */
81 	int c;
82 	spk_lock(flags);
83 	while (inb_p(speakup_info.port_tts + UART_LSR) & UART_LSR_DR) {
84 
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); */
89 	}
90 	spk_unlock(flags);
91 	return IRQ_HANDLED;
92 }
93 
start_serial_interrupt(int irq)94 static void start_serial_interrupt(int irq)
95 {
96 	int rv;
97 
98 	if (synth->read_buff_add == NULL)
99 		return;
100 
101 	rv = request_irq(irq, synth_readbuf_handler, IRQF_SHARED,
102 			 "serial", (void *) synth_readbuf_handler);
103 
104 	if (rv)
105 		printk(KERN_ERR "Unable to request Speakup serial I R Q\n");
106 	/* Set MCR */
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 */
117 }
118 
spk_stop_serial_interrupt(void)119 void spk_stop_serial_interrupt(void)
120 {
121 	if (speakup_info.port_tts == 0)
122 		return;
123 
124 	if (synth->read_buff_add == NULL)
125 		return;
126 
127 	/* Turn off interrupts */
128 	outb(0, speakup_info.port_tts+UART_IER);
129 	/* Free IRQ */
130 	free_irq(serstate->irq, (void *) synth_readbuf_handler);
131 }
132 
spk_wait_for_xmitr(void)133 int spk_wait_for_xmitr(void)
134 {
135 	int tmout = SPK_XMITR_TIMEOUT;
136 	if ((synth->alive) && (timeouts >= NUM_DISABLE_TIMEOUTS)) {
137 		pr_warn("%s: too many timeouts, deactivating speakup\n",
138 			synth->long_name);
139 		synth->alive = 0;
140 		/* No synth any more, so nobody will restart TTYs, and we thus
141 		 * need to do it ourselves.  Now that there is no synth we can
142 		 * let application flood anyway */
143 		speakup_start_ttys();
144 		timeouts = 0;
145 		return 0;
146 	}
147 	while (spk_serial_tx_busy()) {
148 		if (--tmout == 0) {
149 			pr_warn("%s: timed out (tx busy)\n", synth->long_name);
150 			timeouts++;
151 			return 0;
152 		}
153 		udelay(1);
154 	}
155 	tmout = SPK_CTS_TIMEOUT;
156 	while (!((inb_p(speakup_info.port_tts + UART_MSR)) & UART_MSR_CTS)) {
157 		/* CTS */
158 		if (--tmout == 0) {
159 			/* pr_warn("%s: timed out (cts)\n",
160 			 * synth->long_name); */
161 			timeouts++;
162 			return 0;
163 		}
164 		udelay(1);
165 	}
166 	timeouts = 0;
167 	return 1;
168 }
169 
spk_serial_in(void)170 unsigned char spk_serial_in(void)
171 {
172 	int tmout = SPK_SERIAL_TIMEOUT;
173 
174 	while (!(inb_p(speakup_info.port_tts + UART_LSR) & UART_LSR_DR)) {
175 		if (--tmout == 0) {
176 			pr_warn("time out while waiting for input.\n");
177 			return 0xff;
178 		}
179 		udelay(1);
180 	}
181 	return inb_p(speakup_info.port_tts + UART_RX);
182 }
183 EXPORT_SYMBOL_GPL(spk_serial_in);
184 
spk_serial_in_nowait(void)185 unsigned char spk_serial_in_nowait(void)
186 {
187 	unsigned char lsr;
188 
189 	lsr = inb_p(speakup_info.port_tts + UART_LSR);
190 	if (!(lsr & UART_LSR_DR))
191 		return 0;
192 	return inb_p(speakup_info.port_tts + UART_RX);
193 }
194 EXPORT_SYMBOL_GPL(spk_serial_in_nowait);
195 
spk_serial_out(const char ch)196 int spk_serial_out(const char ch)
197 {
198 	if (synth->alive && spk_wait_for_xmitr()) {
199 		outb_p(ch, speakup_info.port_tts);
200 		return 1;
201 	}
202 	return 0;
203 }
204 EXPORT_SYMBOL_GPL(spk_serial_out);
205 
spk_serial_release(void)206 void spk_serial_release(void)
207 {
208 	if (speakup_info.port_tts == 0)
209 		return;
210 	synth_release_region(speakup_info.port_tts, 8);
211 	speakup_info.port_tts = 0;
212 }
213 EXPORT_SYMBOL_GPL(spk_serial_release);
214 
215