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