Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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#ifndef SERIAL_PORT_DFNS
10#define SERIAL_PORT_DFNS
11#endif
12
13static void start_serial_interrupt(int irq);
14
15static const struct old_serial_port rs_table[] = {
16 SERIAL_PORT_DFNS
17};
18static const struct old_serial_port *serstate;
19static int timeouts;
20
21const struct old_serial_port *spk_serial_init(int index)
22{
23 int baud = 9600, quot = 0;
24 unsigned int cval = 0;
25 int cflag = CREAD | HUPCL | CLOCAL | B9600 | CS8;
26 const struct old_serial_port *ser = rs_table + index;
27 int err;
28
29 /* Divisor, bytesize and parity */
30 quot = ser->baud_base / baud;
31 cval = cflag & (CSIZE | CSTOPB);
32#if defined(__powerpc__) || defined(__alpha__)
33 cval >>= 8;
34#else /* !__powerpc__ && !__alpha__ */
35 cval >>= 4;
36#endif /* !__powerpc__ && !__alpha__ */
37 if (cflag & PARENB)
38 cval |= UART_LCR_PARITY;
39 if (!(cflag & PARODD))
40 cval |= UART_LCR_EPAR;
41 if (synth_request_region(ser->port, 8)) {
42 /* try to take it back. */
43 pr_info("Ports not available, trying to steal them\n");
44 __release_region(&ioport_resource, ser->port, 8);
45 err = synth_request_region(ser->port, 8);
46 if (err) {
47 pr_warn("Unable to allocate port at %x, errno %i",
48 ser->port, err);
49 return NULL;
50 }
51 }
52
53 /* Disable UART interrupts, set DTR and RTS high
54 * and set speed. */
55 outb(cval | UART_LCR_DLAB, ser->port + UART_LCR); /* set DLAB */
56 outb(quot & 0xff, ser->port + UART_DLL); /* LS of divisor */
57 outb(quot >> 8, ser->port + UART_DLM); /* MS of divisor */
58 outb(cval, ser->port + UART_LCR); /* reset DLAB */
59
60 /* Turn off Interrupts */
61 outb(0, ser->port + UART_IER);
62 outb(UART_MCR_DTR | UART_MCR_RTS, ser->port + UART_MCR);
63
64 /* If we read 0xff from the LSR, there is no UART here. */
65 if (inb(ser->port + UART_LSR) == 0xff) {
66 synth_release_region(ser->port, 8);
67 serstate = NULL;
68 return NULL;
69 }
70
71 mdelay(1);
72 speakup_info.port_tts = ser->port;
73 serstate = ser;
74
75 start_serial_interrupt(ser->irq);
76
77 return ser;
78}
79
80static irqreturn_t synth_readbuf_handler(int irq, void *dev_id)
81{
82 unsigned long flags;
83/*printk(KERN_ERR "in irq\n"); */
84/*pr_warn("in IRQ\n"); */
85 int c;
86
87 spin_lock_irqsave(&speakup_info.spinlock, flags);
88 while (inb_p(speakup_info.port_tts + UART_LSR) & UART_LSR_DR) {
89
90 c = inb_p(speakup_info.port_tts+UART_RX);
91 synth->read_buff_add((u_char) c);
92/*printk(KERN_ERR "c = %d\n", c); */
93/*pr_warn("C = %d\n", c); */
94 }
95 spin_unlock_irqrestore(&speakup_info.spinlock, flags);
96 return IRQ_HANDLED;
97}
98
99static void start_serial_interrupt(int irq)
100{
101 int rv;
102
103 if (synth->read_buff_add == NULL)
104 return;
105
106 rv = request_irq(irq, synth_readbuf_handler, IRQF_SHARED,
107 "serial", (void *) synth_readbuf_handler);
108
109 if (rv)
110 pr_err("Unable to request Speakup serial I R Q\n");
111 /* Set MCR */
112 outb(UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2,
113 speakup_info.port_tts + UART_MCR);
114 /* Turn on Interrupts */
115 outb(UART_IER_MSI|UART_IER_RLSI|UART_IER_RDI,
116 speakup_info.port_tts + UART_IER);
117 inb(speakup_info.port_tts+UART_LSR);
118 inb(speakup_info.port_tts+UART_RX);
119 inb(speakup_info.port_tts+UART_IIR);
120 inb(speakup_info.port_tts+UART_MSR);
121 outb(1, speakup_info.port_tts + UART_FCR); /* Turn FIFO On */
122}
123
124void spk_stop_serial_interrupt(void)
125{
126 if (speakup_info.port_tts == 0)
127 return;
128
129 if (synth->read_buff_add == NULL)
130 return;
131
132 /* Turn off interrupts */
133 outb(0, speakup_info.port_tts+UART_IER);
134 /* Free IRQ */
135 free_irq(serstate->irq, (void *) synth_readbuf_handler);
136}
137
138int spk_wait_for_xmitr(void)
139{
140 int tmout = SPK_XMITR_TIMEOUT;
141
142 if ((synth->alive) && (timeouts >= NUM_DISABLE_TIMEOUTS)) {
143 pr_warn("%s: too many timeouts, deactivating speakup\n",
144 synth->long_name);
145 synth->alive = 0;
146 /* No synth any more, so nobody will restart TTYs, and we thus
147 * need to do it ourselves. Now that there is no synth we can
148 * let application flood anyway */
149 speakup_start_ttys();
150 timeouts = 0;
151 return 0;
152 }
153 while (spk_serial_tx_busy()) {
154 if (--tmout == 0) {
155 pr_warn("%s: timed out (tx busy)\n", synth->long_name);
156 timeouts++;
157 return 0;
158 }
159 udelay(1);
160 }
161 tmout = SPK_CTS_TIMEOUT;
162 while (!((inb_p(speakup_info.port_tts + UART_MSR)) & UART_MSR_CTS)) {
163 /* CTS */
164 if (--tmout == 0) {
165 /* pr_warn("%s: timed out (cts)\n",
166 * synth->long_name); */
167 timeouts++;
168 return 0;
169 }
170 udelay(1);
171 }
172 timeouts = 0;
173 return 1;
174}
175
176unsigned char spk_serial_in(void)
177{
178 int tmout = SPK_SERIAL_TIMEOUT;
179
180 while (!(inb_p(speakup_info.port_tts + UART_LSR) & UART_LSR_DR)) {
181 if (--tmout == 0) {
182 pr_warn("time out while waiting for input.\n");
183 return 0xff;
184 }
185 udelay(1);
186 }
187 return inb_p(speakup_info.port_tts + UART_RX);
188}
189EXPORT_SYMBOL_GPL(spk_serial_in);
190
191unsigned char spk_serial_in_nowait(void)
192{
193 unsigned char lsr;
194
195 lsr = inb_p(speakup_info.port_tts + UART_LSR);
196 if (!(lsr & UART_LSR_DR))
197 return 0;
198 return inb_p(speakup_info.port_tts + UART_RX);
199}
200EXPORT_SYMBOL_GPL(spk_serial_in_nowait);
201
202int spk_serial_out(const char ch)
203{
204 if (synth->alive && spk_wait_for_xmitr()) {
205 outb_p(ch, speakup_info.port_tts);
206 return 1;
207 }
208 return 0;
209}
210EXPORT_SYMBOL_GPL(spk_serial_out);
211
212void spk_serial_release(void)
213{
214 if (speakup_info.port_tts == 0)
215 return;
216 synth_release_region(speakup_info.port_tts, 8);
217 speakup_info.port_tts = 0;
218}
219EXPORT_SYMBOL_GPL(spk_serial_release);
220