[deliverable/linux.git] / drivers / staging / speakup / serialio.c

#include <linux/interrupt.h>
#include <linux/ioport.h>

#include "spk_types.h"
#include "speakup.h"
#include "spk_priv.h"
#include "serialio.h"

#include <linux/serial_core.h>
/* WARNING:  Do not change this to <linux/serial.h> without testing that
 * SERIAL_PORT_DFNS does get defined to the appropriate value.
 */
#include <asm/serial.h>

#ifndef SERIAL_PORT_DFNS
#define SERIAL_PORT_DFNS
#endif

static void start_serial_interrupt(int irq);

static const struct old_serial_port rs_table[] = {
	SERIAL_PORT_DFNS
};
static const struct old_serial_port *serstate;
static int timeouts;

const struct old_serial_port *spk_serial_init(int index)
{
	int baud = 9600, quot = 0;
	unsigned int cval = 0;
	int cflag = CREAD | HUPCL | CLOCAL | B9600 | CS8;
	const struct old_serial_port *ser;
	int err;

	if (index >= ARRAY_SIZE(rs_table)) {
		pr_info("no port info for ttyS%d\n", index);
		return NULL;
	}
	ser = rs_table + index;

	/*	Divisor, bytesize and parity */
	quot = ser->baud_base / baud;
	cval = cflag & (CSIZE | CSTOPB);
#if defined(__powerpc__) || defined(__alpha__)
	cval >>= 8;
#else /* !__powerpc__ && !__alpha__ */
	cval >>= 4;
#endif /* !__powerpc__ && !__alpha__ */
	if (cflag & PARENB)
		cval |= UART_LCR_PARITY;
	if (!(cflag & PARODD))
		cval |= UART_LCR_EPAR;
	if (synth_request_region(ser->port, 8)) {
		/* try to take it back. */
		pr_info("Ports not available, trying to steal them\n");
		__release_region(&ioport_resource, ser->port, 8);
		err = synth_request_region(ser->port, 8);
		if (err) {
			pr_warn("Unable to allocate port at %x, errno %i",
				ser->port, err);
			return NULL;
		}
	}

	/*	Disable UART interrupts, set DTR and RTS high
	 *	and set speed.
	 */
	outb(cval | UART_LCR_DLAB, ser->port + UART_LCR);	/* set DLAB */
	outb(quot & 0xff, ser->port + UART_DLL);	/* LS of divisor */
	outb(quot >> 8, ser->port + UART_DLM);		/* MS of divisor */
	outb(cval, ser->port + UART_LCR);		/* reset DLAB */

	/* Turn off Interrupts */
	outb(0, ser->port + UART_IER);
	outb(UART_MCR_DTR | UART_MCR_RTS, ser->port + UART_MCR);

	/* If we read 0xff from the LSR, there is no UART here. */
	if (inb(ser->port + UART_LSR) == 0xff) {
		synth_release_region(ser->port, 8);
		serstate = NULL;
		return NULL;
	}

	mdelay(1);
	speakup_info.port_tts = ser->port;
	serstate = ser;

	start_serial_interrupt(ser->irq);

	return ser;
}

static irqreturn_t synth_readbuf_handler(int irq, void *dev_id)
{
	unsigned long flags;
	int c;

	spin_lock_irqsave(&speakup_info.spinlock, flags);
	while (inb_p(speakup_info.port_tts + UART_LSR) & UART_LSR_DR) {

		c = inb_p(speakup_info.port_tts+UART_RX);
		synth->read_buff_add((u_char) c);
	}
	spin_unlock_irqrestore(&speakup_info.spinlock, flags);
	return IRQ_HANDLED;
}

static void start_serial_interrupt(int irq)
{
	int rv;

	if (!synth->read_buff_add)
		return;

	rv = request_irq(irq, synth_readbuf_handler, IRQF_SHARED,
			 "serial", (void *) synth_readbuf_handler);

	if (rv)
		pr_err("Unable to request Speakup serial I R Q\n");
	/* Set MCR */
	outb(UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2,
			speakup_info.port_tts + UART_MCR);
	/* Turn on Interrupts */
	outb(UART_IER_MSI|UART_IER_RLSI|UART_IER_RDI,
			speakup_info.port_tts + UART_IER);
	inb(speakup_info.port_tts+UART_LSR);
	inb(speakup_info.port_tts+UART_RX);
	inb(speakup_info.port_tts+UART_IIR);
	inb(speakup_info.port_tts+UART_MSR);
	outb(1, speakup_info.port_tts + UART_FCR);	/* Turn FIFO On */
}

void spk_stop_serial_interrupt(void)
{
	if (speakup_info.port_tts == 0)
		return;

	if (!synth->read_buff_add)
		return;

	/* Turn off interrupts */
	outb(0, speakup_info.port_tts+UART_IER);
	/* Free IRQ */
	free_irq(serstate->irq, (void *) synth_readbuf_handler);
}

int spk_wait_for_xmitr(void)
{
	int tmout = SPK_XMITR_TIMEOUT;

	if ((synth->alive) && (timeouts >= NUM_DISABLE_TIMEOUTS)) {
		pr_warn("%s: too many timeouts, deactivating speakup\n",
			synth->long_name);
		synth->alive = 0;
		/* No synth any more, so nobody will restart TTYs, and we thus
		 * need to do it ourselves.  Now that there is no synth we can
		 * let application flood anyway
		 */
		speakup_start_ttys();
		timeouts = 0;
		return 0;
	}
	while (spk_serial_tx_busy()) {
		if (--tmout == 0) {
			pr_warn("%s: timed out (tx busy)\n", synth->long_name);
			timeouts++;
			return 0;
		}
		udelay(1);
	}
	tmout = SPK_CTS_TIMEOUT;
	while (!((inb_p(speakup_info.port_tts + UART_MSR)) & UART_MSR_CTS)) {
		/* CTS */
		if (--tmout == 0) {
			timeouts++;
			return 0;
		}
		udelay(1);
	}
	timeouts = 0;
	return 1;
}

unsigned char spk_serial_in(void)
{
	int tmout = SPK_SERIAL_TIMEOUT;

	while (!(inb_p(speakup_info.port_tts + UART_LSR) & UART_LSR_DR)) {
		if (--tmout == 0) {
			pr_warn("time out while waiting for input.\n");
			return 0xff;
		}
		udelay(1);
	}
	return inb_p(speakup_info.port_tts + UART_RX);
}
EXPORT_SYMBOL_GPL(spk_serial_in);

unsigned char spk_serial_in_nowait(void)
{
	unsigned char lsr;

	lsr = inb_p(speakup_info.port_tts + UART_LSR);
	if (!(lsr & UART_LSR_DR))
		return 0;
	return inb_p(speakup_info.port_tts + UART_RX);
}
EXPORT_SYMBOL_GPL(spk_serial_in_nowait);

int spk_serial_out(const char ch)
{
	if (synth->alive && spk_wait_for_xmitr()) {
		outb_p(ch, speakup_info.port_tts);
		return 1;
	}
	return 0;
}
EXPORT_SYMBOL_GPL(spk_serial_out);

void spk_serial_release(void)
{
	if (speakup_info.port_tts == 0)
		return;
	synth_release_region(speakup_info.port_tts, 8);
	speakup_info.port_tts = 0;
}
EXPORT_SYMBOL_GPL(spk_serial_release);
Commit	Line	Data
c6e3fd22 WH	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
327b882d ST	9	#include <linux/serial_core.h>
327b882d ST	10	/* WARNING: Do not change this to <linux/serial.h> without testing that
e6ceec82 JR	11	* SERIAL_PORT_DFNS does get defined to the appropriate value.
e6ceec82 JR	12	*/
327b882d ST	13	#include <asm/serial.h>
327b882d ST	14
5e6dc548 CG	15	#ifndef SERIAL_PORT_DFNS
	16	#define SERIAL_PORT_DFNS
	17	#endif
	18
c6e3fd22 WH	19	static void start_serial_interrupt(int irq);
c6e3fd22 WH	20
3ee0017e	21	static const struct old_serial_port rs_table[] = {
c6e3fd22 WH	22	SERIAL_PORT_DFNS
c6e3fd22 WH	23	};
3ee0017e	24	static const struct old_serial_port *serstate;
c6e3fd22 WH	25	static int timeouts;
c6e3fd22 WH	26
3ee0017e	27	const struct old_serial_port *spk_serial_init(int index)
c6e3fd22 WH	28	{
	29	int baud = 9600, quot = 0;
	30	unsigned int cval = 0;
	31	int cflag = CREAD \| HUPCL \| CLOCAL \| B9600 \| CS8;
327b882d	32	const struct old_serial_port *ser;
c6e3fd22 WH	33	int err;
c6e3fd22 WH	34
327b882d ST	35	if (index >= ARRAY_SIZE(rs_table)) {
	36	pr_info("no port info for ttyS%d\n", index);
	37	return NULL;
	38	}
	39	ser = rs_table + index;
	40
c6e3fd22 WH	41	/* Divisor, bytesize and parity */
	42	quot = ser->baud_base / baud;
	43	cval = cflag & (CSIZE \| CSTOPB);
	44	#if defined(__powerpc__) \|\| defined(__alpha__)
	45	cval >>= 8;
	46	#else /* !__powerpc__ && !__alpha__ */
	47	cval >>= 4;
	48	#endif /* !__powerpc__ && !__alpha__ */
	49	if (cflag & PARENB)
	50	cval \|= UART_LCR_PARITY;
	51	if (!(cflag & PARODD))
	52	cval \|= UART_LCR_EPAR;
	53	if (synth_request_region(ser->port, 8)) {
	54	/* try to take it back. */
3a046c19	55	pr_info("Ports not available, trying to steal them\n");
c6e3fd22 WH	56	__release_region(&ioport_resource, ser->port, 8);
	57	err = synth_request_region(ser->port, 8);
	58	if (err) {
3ee0017e	59	pr_warn("Unable to allocate port at %x, errno %i",
baf9ac9f	60	ser->port, err);
c6e3fd22 WH	61	return NULL;
	62	}
	63	}
	64
	65	/* Disable UART interrupts, set DTR and RTS high
13d825ed AF	66	* and set speed.
13d825ed AF	67	*/
c6e3fd22 WH	68	outb(cval \| UART_LCR_DLAB, ser->port + UART_LCR); /* set DLAB */
	69	outb(quot & 0xff, ser->port + UART_DLL); /* LS of divisor */
	70	outb(quot >> 8, ser->port + UART_DLM); /* MS of divisor */
	71	outb(cval, ser->port + UART_LCR); /* reset DLAB */
	72
	73	/* Turn off Interrupts */
	74	outb(0, ser->port + UART_IER);
	75	outb(UART_MCR_DTR \| UART_MCR_RTS, ser->port + UART_MCR);
	76
	77	/* If we read 0xff from the LSR, there is no UART here. */
	78	if (inb(ser->port + UART_LSR) == 0xff) {
	79	synth_release_region(ser->port, 8);
	80	serstate = NULL;
	81	return NULL;
	82	}
	83
	84	mdelay(1);
	85	speakup_info.port_tts = ser->port;
	86	serstate = ser;
	87
	88	start_serial_interrupt(ser->irq);
	89
	90	return ser;
	91	}
	92
	93	static irqreturn_t synth_readbuf_handler(int irq, void *dev_id)
	94	{
	95	unsigned long flags;
c6e3fd22	96	int c;
8e69a811	97
9fb31b1a	98	spin_lock_irqsave(&speakup_info.spinlock, flags);
c6e3fd22 WH	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);
c6e3fd22	103	}
9fb31b1a	104	spin_unlock_irqrestore(&speakup_info.spinlock, flags);
c6e3fd22 WH	105	return IRQ_HANDLED;
	106	}
	107
	108	static void start_serial_interrupt(int irq)
	109	{
	110	int rv;
	111
114885e0	112	if (!synth->read_buff_add)
c6e3fd22 WH	113	return;
	114
	115	rv = request_irq(irq, synth_readbuf_handler, IRQF_SHARED,
	116	"serial", (void *) synth_readbuf_handler);
	117
	118	if (rv)
3a046c19	119	pr_err("Unable to request Speakup serial I R Q\n");
c6e3fd22 WH	120	/* Set MCR */
	121	outb(UART_MCR_DTR \| UART_MCR_RTS \| UART_MCR_OUT2,
	122	speakup_info.port_tts + UART_MCR);
	123	/* Turn on Interrupts */
	124	outb(UART_IER_MSI\|UART_IER_RLSI\|UART_IER_RDI,
	125	speakup_info.port_tts + UART_IER);
	126	inb(speakup_info.port_tts+UART_LSR);
	127	inb(speakup_info.port_tts+UART_RX);
	128	inb(speakup_info.port_tts+UART_IIR);
	129	inb(speakup_info.port_tts+UART_MSR);
	130	outb(1, speakup_info.port_tts + UART_FCR); /* Turn FIFO On */
	131	}
	132
ca2beaf8	133	void spk_stop_serial_interrupt(void)
c6e3fd22 WH	134	{
	135	if (speakup_info.port_tts == 0)
	136	return;
	137
114885e0	138	if (!synth->read_buff_add)
c6e3fd22 WH	139	return;
	140
	141	/* Turn off interrupts */
	142	outb(0, speakup_info.port_tts+UART_IER);
	143	/* Free IRQ */
	144	free_irq(serstate->irq, (void *) synth_readbuf_handler);
	145	}
	146
ca2beaf8	147	int spk_wait_for_xmitr(void)
c6e3fd22 WH	148	{
c6e3fd22 WH	149	int tmout = SPK_XMITR_TIMEOUT;
8e69a811	150
c6e3fd22	151	if ((synth->alive) && (timeouts >= NUM_DISABLE_TIMEOUTS)) {
baf9ac9f WH	152	pr_warn("%s: too many timeouts, deactivating speakup\n",
baf9ac9f WH	153	synth->long_name);
c6e3fd22 WH	154	synth->alive = 0;
	155	/* No synth any more, so nobody will restart TTYs, and we thus
	156	* need to do it ourselves. Now that there is no synth we can
13d825ed AF	157	* let application flood anyway
13d825ed AF	158	*/
c6e3fd22 WH	159	speakup_start_ttys();
	160	timeouts = 0;
	161	return 0;
	162	}
	163	while (spk_serial_tx_busy()) {
	164	if (--tmout == 0) {
	165	pr_warn("%s: timed out (tx busy)\n", synth->long_name);
	166	timeouts++;
	167	return 0;
	168	}
	169	udelay(1);
	170	}
	171	tmout = SPK_CTS_TIMEOUT;
	172	while (!((inb_p(speakup_info.port_tts + UART_MSR)) & UART_MSR_CTS)) {
	173	/* CTS */
	174	if (--tmout == 0) {
c6e3fd22 WH	175	timeouts++;
	176	return 0;
	177	}
	178	udelay(1);
	179	}
	180	timeouts = 0;
	181	return 1;
	182	}
	183
	184	unsigned char spk_serial_in(void)
	185	{
	186	int tmout = SPK_SERIAL_TIMEOUT;
	187
	188	while (!(inb_p(speakup_info.port_tts + UART_LSR) & UART_LSR_DR)) {
	189	if (--tmout == 0) {
	190	pr_warn("time out while waiting for input.\n");
	191	return 0xff;
	192	}
	193	udelay(1);
	194	}
	195	return inb_p(speakup_info.port_tts + UART_RX);
	196	}
	197	EXPORT_SYMBOL_GPL(spk_serial_in);
	198
	199	unsigned char spk_serial_in_nowait(void)
	200	{
	201	unsigned char lsr;
	202
	203	lsr = inb_p(speakup_info.port_tts + UART_LSR);
	204	if (!(lsr & UART_LSR_DR))
	205	return 0;
	206	return inb_p(speakup_info.port_tts + UART_RX);
	207	}
	208	EXPORT_SYMBOL_GPL(spk_serial_in_nowait);
	209
	210	int spk_serial_out(const char ch)
	211	{
ca2beaf8	212	if (synth->alive && spk_wait_for_xmitr()) {
c6e3fd22 WH	213	outb_p(ch, speakup_info.port_tts);
	214	return 1;
	215	}
	216	return 0;
	217	}
	218	EXPORT_SYMBOL_GPL(spk_serial_out);
	219
	220	void spk_serial_release(void)
	221	{
	222	if (speakup_info.port_tts == 0)
	223	return;
	224	synth_release_region(speakup_info.port_tts, 8);
	225	speakup_info.port_tts = 0;
	226	}
	227	EXPORT_SYMBOL_GPL(spk_serial_release);