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 #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>
13
14 #ifndef SERIAL_PORT_DFNS
15 #define SERIAL_PORT_DFNS
16 #endif
17
18 static void start_serial_interrupt(int irq);
19
20 static const struct old_serial_port rs_table[] = {
21 SERIAL_PORT_DFNS
22 };
23 static const struct old_serial_port *serstate;
24 static int timeouts;
25
spk_serial_init(int index)26 const struct old_serial_port *spk_serial_init(int index)
27 {
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;
32 int err;
33
34 if (index >= ARRAY_SIZE(rs_table)) {
35 pr_info("no port info for ttyS%d\n", index);
36 return NULL;
37 }
38 ser = rs_table + index;
39
40 /* Divisor, bytesize and parity */
41 quot = ser->baud_base / baud;
42 cval = cflag & (CSIZE | CSTOPB);
43 #if defined(__powerpc__) || defined(__alpha__)
44 cval >>= 8;
45 #else /* !__powerpc__ && !__alpha__ */
46 cval >>= 4;
47 #endif /* !__powerpc__ && !__alpha__ */
48 if (cflag & PARENB)
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);
57 if (err) {
58 pr_warn("Unable to allocate port at %x, errno %i",
59 ser->port, err);
60 return NULL;
61 }
62 }
63
64 /* Disable UART interrupts, set DTR and RTS high
65 * and set speed.
66 */
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 */
71
72 /* Turn off Interrupts */
73 outb(0, ser->port + UART_IER);
74 outb(UART_MCR_DTR | UART_MCR_RTS, ser->port + UART_MCR);
75
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);
79 serstate = NULL;
80 return NULL;
81 }
82
83 mdelay(1);
84 speakup_info.port_tts = ser->port;
85 serstate = ser;
86
87 start_serial_interrupt(ser->irq);
88
89 return ser;
90 }
91
synth_readbuf_handler(int irq,void * dev_id)92 static irqreturn_t synth_readbuf_handler(int irq, void *dev_id)
93 {
94 unsigned long flags;
95 /*printk(KERN_ERR "in irq\n"); */
96 /*pr_warn("in IRQ\n"); */
97 int c;
98
99 spin_lock_irqsave(&speakup_info.spinlock, flags);
100 while (inb_p(speakup_info.port_tts + UART_LSR) & UART_LSR_DR) {
101
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); */
106 }
107 spin_unlock_irqrestore(&speakup_info.spinlock, flags);
108 return IRQ_HANDLED;
109 }
110
start_serial_interrupt(int irq)111 static void start_serial_interrupt(int irq)
112 {
113 int rv;
114
115 if (!synth->read_buff_add)
116 return;
117
118 rv = request_irq(irq, synth_readbuf_handler, IRQF_SHARED,
119 "serial", (void *) synth_readbuf_handler);
120
121 if (rv)
122 pr_err("Unable to request Speakup serial I R Q\n");
123 /* Set MCR */
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 */
134 }
135
spk_stop_serial_interrupt(void)136 void spk_stop_serial_interrupt(void)
137 {
138 if (speakup_info.port_tts == 0)
139 return;
140
141 if (!synth->read_buff_add)
142 return;
143
144 /* Turn off interrupts */
145 outb(0, speakup_info.port_tts+UART_IER);
146 /* Free IRQ */
147 free_irq(serstate->irq, (void *) synth_readbuf_handler);
148 }
149
spk_wait_for_xmitr(void)150 int spk_wait_for_xmitr(void)
151 {
152 int tmout = SPK_XMITR_TIMEOUT;
153
154 if ((synth->alive) && (timeouts >= NUM_DISABLE_TIMEOUTS)) {
155 pr_warn("%s: too many timeouts, deactivating speakup\n",
156 synth->long_name);
157 synth->alive = 0;
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
161 */
162 speakup_start_ttys();
163 timeouts = 0;
164 return 0;
165 }
166 while (spk_serial_tx_busy()) {
167 if (--tmout == 0) {
168 pr_warn("%s: timed out (tx busy)\n", synth->long_name);
169 timeouts++;
170 return 0;
171 }
172 udelay(1);
173 }
174 tmout = SPK_CTS_TIMEOUT;
175 while (!((inb_p(speakup_info.port_tts + UART_MSR)) & UART_MSR_CTS)) {
176 /* CTS */
177 if (--tmout == 0) {
178 /* pr_warn("%s: timed out (cts)\n",
179 * synth->long_name);
180 */
181 timeouts++;
182 return 0;
183 }
184 udelay(1);
185 }
186 timeouts = 0;
187 return 1;
188 }
189
spk_serial_in(void)190 unsigned char spk_serial_in(void)
191 {
192 int tmout = SPK_SERIAL_TIMEOUT;
193
194 while (!(inb_p(speakup_info.port_tts + UART_LSR) & UART_LSR_DR)) {
195 if (--tmout == 0) {
196 pr_warn("time out while waiting for input.\n");
197 return 0xff;
198 }
199 udelay(1);
200 }
201 return inb_p(speakup_info.port_tts + UART_RX);
202 }
203 EXPORT_SYMBOL_GPL(spk_serial_in);
204
spk_serial_in_nowait(void)205 unsigned char spk_serial_in_nowait(void)
206 {
207 unsigned char lsr;
208
209 lsr = inb_p(speakup_info.port_tts + UART_LSR);
210 if (!(lsr & UART_LSR_DR))
211 return 0;
212 return inb_p(speakup_info.port_tts + UART_RX);
213 }
214 EXPORT_SYMBOL_GPL(spk_serial_in_nowait);
215
spk_serial_out(const char ch)216 int spk_serial_out(const char ch)
217 {
218 if (synth->alive && spk_wait_for_xmitr()) {
219 outb_p(ch, speakup_info.port_tts);
220 return 1;
221 }
222 return 0;
223 }
224 EXPORT_SYMBOL_GPL(spk_serial_out);
225
spk_serial_release(void)226 void spk_serial_release(void)
227 {
228 if (speakup_info.port_tts == 0)
229 return;
230 synth_release_region(speakup_info.port_tts, 8);
231 speakup_info.port_tts = 0;
232 }
233 EXPORT_SYMBOL_GPL(spk_serial_release);
234