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
stop_serial_interrupt(void)119 void 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
wait_for_xmitr(void)133 int 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 && 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