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 outb(cval | UART_LCR_DLAB, ser->port + UART_LCR); /* set DLAB */
67 outb(quot & 0xff, ser->port + UART_DLL); /* LS of divisor */
68 outb(quot >> 8, ser->port + UART_DLM); /* MS of divisor */
69 outb(cval, ser->port + UART_LCR); /* reset DLAB */
70
71 /* Turn off Interrupts */
72 outb(0, ser->port + UART_IER);
73 outb(UART_MCR_DTR | UART_MCR_RTS, ser->port + UART_MCR);
74
75 /* If we read 0xff from the LSR, there is no UART here. */
76 if (inb(ser->port + UART_LSR) == 0xff) {
77 synth_release_region(ser->port, 8);
78 serstate = NULL;
79 return NULL;
80 }
81
82 mdelay(1);
83 speakup_info.port_tts = ser->port;
84 serstate = ser;
85
86 start_serial_interrupt(ser->irq);
87
88 return ser;
89 }
90
synth_readbuf_handler(int irq,void * dev_id)91 static irqreturn_t synth_readbuf_handler(int irq, void *dev_id)
92 {
93 unsigned long flags;
94 /*printk(KERN_ERR "in irq\n"); */
95 /*pr_warn("in IRQ\n"); */
96 int c;
97
98 spin_lock_irqsave(&speakup_info.spinlock, flags);
99 while (inb_p(speakup_info.port_tts + UART_LSR) & UART_LSR_DR) {
100
101 c = inb_p(speakup_info.port_tts+UART_RX);
102 synth->read_buff_add((u_char) c);
103 /*printk(KERN_ERR "c = %d\n", c); */
104 /*pr_warn("C = %d\n", c); */
105 }
106 spin_unlock_irqrestore(&speakup_info.spinlock, flags);
107 return IRQ_HANDLED;
108 }
109
start_serial_interrupt(int irq)110 static void start_serial_interrupt(int irq)
111 {
112 int rv;
113
114 if (synth->read_buff_add == NULL)
115 return;
116
117 rv = request_irq(irq, synth_readbuf_handler, IRQF_SHARED,
118 "serial", (void *) synth_readbuf_handler);
119
120 if (rv)
121 pr_err("Unable to request Speakup serial I R Q\n");
122 /* Set MCR */
123 outb(UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2,
124 speakup_info.port_tts + UART_MCR);
125 /* Turn on Interrupts */
126 outb(UART_IER_MSI|UART_IER_RLSI|UART_IER_RDI,
127 speakup_info.port_tts + UART_IER);
128 inb(speakup_info.port_tts+UART_LSR);
129 inb(speakup_info.port_tts+UART_RX);
130 inb(speakup_info.port_tts+UART_IIR);
131 inb(speakup_info.port_tts+UART_MSR);
132 outb(1, speakup_info.port_tts + UART_FCR); /* Turn FIFO On */
133 }
134
spk_stop_serial_interrupt(void)135 void spk_stop_serial_interrupt(void)
136 {
137 if (speakup_info.port_tts == 0)
138 return;
139
140 if (synth->read_buff_add == NULL)
141 return;
142
143 /* Turn off interrupts */
144 outb(0, speakup_info.port_tts+UART_IER);
145 /* Free IRQ */
146 free_irq(serstate->irq, (void *) synth_readbuf_handler);
147 }
148
spk_wait_for_xmitr(void)149 int spk_wait_for_xmitr(void)
150 {
151 int tmout = SPK_XMITR_TIMEOUT;
152
153 if ((synth->alive) && (timeouts >= NUM_DISABLE_TIMEOUTS)) {
154 pr_warn("%s: too many timeouts, deactivating speakup\n",
155 synth->long_name);
156 synth->alive = 0;
157 /* No synth any more, so nobody will restart TTYs, and we thus
158 * need to do it ourselves. Now that there is no synth we can
159 * let application flood anyway */
160 speakup_start_ttys();
161 timeouts = 0;
162 return 0;
163 }
164 while (spk_serial_tx_busy()) {
165 if (--tmout == 0) {
166 pr_warn("%s: timed out (tx busy)\n", synth->long_name);
167 timeouts++;
168 return 0;
169 }
170 udelay(1);
171 }
172 tmout = SPK_CTS_TIMEOUT;
173 while (!((inb_p(speakup_info.port_tts + UART_MSR)) & UART_MSR_CTS)) {
174 /* CTS */
175 if (--tmout == 0) {
176 /* pr_warn("%s: timed out (cts)\n",
177 * synth->long_name); */
178 timeouts++;
179 return 0;
180 }
181 udelay(1);
182 }
183 timeouts = 0;
184 return 1;
185 }
186
spk_serial_in(void)187 unsigned char spk_serial_in(void)
188 {
189 int tmout = SPK_SERIAL_TIMEOUT;
190
191 while (!(inb_p(speakup_info.port_tts + UART_LSR) & UART_LSR_DR)) {
192 if (--tmout == 0) {
193 pr_warn("time out while waiting for input.\n");
194 return 0xff;
195 }
196 udelay(1);
197 }
198 return inb_p(speakup_info.port_tts + UART_RX);
199 }
200 EXPORT_SYMBOL_GPL(spk_serial_in);
201
spk_serial_in_nowait(void)202 unsigned char spk_serial_in_nowait(void)
203 {
204 unsigned char lsr;
205
206 lsr = inb_p(speakup_info.port_tts + UART_LSR);
207 if (!(lsr & UART_LSR_DR))
208 return 0;
209 return inb_p(speakup_info.port_tts + UART_RX);
210 }
211 EXPORT_SYMBOL_GPL(spk_serial_in_nowait);
212
spk_serial_out(const char ch)213 int spk_serial_out(const char ch)
214 {
215 if (synth->alive && spk_wait_for_xmitr()) {
216 outb_p(ch, speakup_info.port_tts);
217 return 1;
218 }
219 return 0;
220 }
221 EXPORT_SYMBOL_GPL(spk_serial_out);
222
spk_serial_release(void)223 void spk_serial_release(void)
224 {
225 if (speakup_info.port_tts == 0)
226 return;
227 synth_release_region(speakup_info.port_tts, 8);
228 speakup_info.port_tts = 0;
229 }
230 EXPORT_SYMBOL_GPL(spk_serial_release);
231
232