[mirror_ubuntu-artful-kernel.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"

#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 = rs_table + index;
	int err;

	/*	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;
/*printk(KERN_ERR "in irq\n"); */
/*pr_warn("in IRQ\n"); */
	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);
/*printk(KERN_ERR "c = %d\n", c); */
/*pr_warn("C = %d\n", 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) {
			/* pr_warn("%s: timed out (cts)\n",
			 * synth->long_name);
			 */
			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
5e6dc548 CG	9	#ifndef SERIAL_PORT_DFNS
	10	#define SERIAL_PORT_DFNS
	11	#endif
	12
c6e3fd22 WH	13	static void start_serial_interrupt(int irq);
c6e3fd22 WH	14
3ee0017e	15	static const struct old_serial_port rs_table[] = {
c6e3fd22 WH	16	SERIAL_PORT_DFNS
c6e3fd22 WH	17	};
3ee0017e	18	static const struct old_serial_port *serstate;
c6e3fd22 WH	19	static int timeouts;
c6e3fd22 WH	20
3ee0017e	21	const struct old_serial_port *spk_serial_init(int index)
c6e3fd22 WH	22	{
	23	int baud = 9600, quot = 0;
	24	unsigned int cval = 0;
	25	int cflag = CREAD \| HUPCL \| CLOCAL \| B9600 \| CS8;
3ee0017e	26	const struct old_serial_port *ser = rs_table + index;
c6e3fd22 WH	27	int err;
c6e3fd22 WH	28
c6e3fd22 WH	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. */
3a046c19	43	pr_info("Ports not available, trying to steal them\n");
c6e3fd22 WH	44	__release_region(&ioport_resource, ser->port, 8);
	45	err = synth_request_region(ser->port, 8);
	46	if (err) {
3ee0017e	47	pr_warn("Unable to allocate port at %x, errno %i",
baf9ac9f	48	ser->port, err);
c6e3fd22 WH	49	return NULL;
	50	}
	51	}
	52
	53	/* Disable UART interrupts, set DTR and RTS high
13d825ed AF	54	* and set speed.
13d825ed AF	55	*/
c6e3fd22 WH	56	outb(cval \| UART_LCR_DLAB, ser->port + UART_LCR); /* set DLAB */
	57	outb(quot & 0xff, ser->port + UART_DLL); /* LS of divisor */
	58	outb(quot >> 8, ser->port + UART_DLM); /* MS of divisor */
	59	outb(cval, ser->port + UART_LCR); /* reset DLAB */
	60
	61	/* Turn off Interrupts */
	62	outb(0, ser->port + UART_IER);
	63	outb(UART_MCR_DTR \| UART_MCR_RTS, ser->port + UART_MCR);
	64
	65	/* If we read 0xff from the LSR, there is no UART here. */
	66	if (inb(ser->port + UART_LSR) == 0xff) {
	67	synth_release_region(ser->port, 8);
	68	serstate = NULL;
	69	return NULL;
	70	}
	71
	72	mdelay(1);
	73	speakup_info.port_tts = ser->port;
	74	serstate = ser;
	75
	76	start_serial_interrupt(ser->irq);
	77
	78	return ser;
	79	}
	80
	81	static irqreturn_t synth_readbuf_handler(int irq, void *dev_id)
	82	{
	83	unsigned long flags;
	84	/printk(KERN_ERR "in irq\n"); /
	85	/pr_warn("in IRQ\n"); /
	86	int c;
8e69a811	87
9fb31b1a	88	spin_lock_irqsave(&speakup_info.spinlock, flags);
c6e3fd22 WH	89	while (inb_p(speakup_info.port_tts + UART_LSR) & UART_LSR_DR) {
	90
	91	c = inb_p(speakup_info.port_tts+UART_RX);
	92	synth->read_buff_add((u_char) c);
	93	/printk(KERN_ERR "c = %d\n", c); /
	94	/pr_warn("C = %d\n", c); /
	95	}
9fb31b1a	96	spin_unlock_irqrestore(&speakup_info.spinlock, flags);
c6e3fd22 WH	97	return IRQ_HANDLED;
	98	}
	99
	100	static void start_serial_interrupt(int irq)
	101	{
	102	int rv;
	103
114885e0	104	if (!synth->read_buff_add)
c6e3fd22 WH	105	return;
	106
	107	rv = request_irq(irq, synth_readbuf_handler, IRQF_SHARED,
	108	"serial", (void *) synth_readbuf_handler);
	109
	110	if (rv)
3a046c19	111	pr_err("Unable to request Speakup serial I R Q\n");
c6e3fd22 WH	112	/* Set MCR */
	113	outb(UART_MCR_DTR \| UART_MCR_RTS \| UART_MCR_OUT2,
	114	speakup_info.port_tts + UART_MCR);
	115	/* Turn on Interrupts */
	116	outb(UART_IER_MSI\|UART_IER_RLSI\|UART_IER_RDI,
	117	speakup_info.port_tts + UART_IER);
	118	inb(speakup_info.port_tts+UART_LSR);
	119	inb(speakup_info.port_tts+UART_RX);
	120	inb(speakup_info.port_tts+UART_IIR);
	121	inb(speakup_info.port_tts+UART_MSR);
	122	outb(1, speakup_info.port_tts + UART_FCR); /* Turn FIFO On */
	123	}
	124
ca2beaf8	125	void spk_stop_serial_interrupt(void)
c6e3fd22 WH	126	{
	127	if (speakup_info.port_tts == 0)
	128	return;
	129
114885e0	130	if (!synth->read_buff_add)
c6e3fd22 WH	131	return;
	132
	133	/* Turn off interrupts */
	134	outb(0, speakup_info.port_tts+UART_IER);
	135	/* Free IRQ */
	136	free_irq(serstate->irq, (void *) synth_readbuf_handler);
	137	}
	138
ca2beaf8	139	int spk_wait_for_xmitr(void)
c6e3fd22 WH	140	{
c6e3fd22 WH	141	int tmout = SPK_XMITR_TIMEOUT;
8e69a811	142
c6e3fd22	143	if ((synth->alive) && (timeouts >= NUM_DISABLE_TIMEOUTS)) {
baf9ac9f WH	144	pr_warn("%s: too many timeouts, deactivating speakup\n",
baf9ac9f WH	145	synth->long_name);
c6e3fd22 WH	146	synth->alive = 0;
	147	/* No synth any more, so nobody will restart TTYs, and we thus
	148	* need to do it ourselves. Now that there is no synth we can
13d825ed AF	149	* let application flood anyway
13d825ed AF	150	*/
c6e3fd22 WH	151	speakup_start_ttys();
	152	timeouts = 0;
	153	return 0;
	154	}
	155	while (spk_serial_tx_busy()) {
	156	if (--tmout == 0) {
	157	pr_warn("%s: timed out (tx busy)\n", synth->long_name);
	158	timeouts++;
	159	return 0;
	160	}
	161	udelay(1);
	162	}
	163	tmout = SPK_CTS_TIMEOUT;
	164	while (!((inb_p(speakup_info.port_tts + UART_MSR)) & UART_MSR_CTS)) {
	165	/* CTS */
	166	if (--tmout == 0) {
baf9ac9f	167	/* pr_warn("%s: timed out (cts)\n",
13d825ed AF	168	* synth->long_name);
13d825ed AF	169	*/
c6e3fd22 WH	170	timeouts++;
	171	return 0;
	172	}
	173	udelay(1);
	174	}
	175	timeouts = 0;
	176	return 1;
	177	}
	178
	179	unsigned char spk_serial_in(void)
	180	{
	181	int tmout = SPK_SERIAL_TIMEOUT;
	182
	183	while (!(inb_p(speakup_info.port_tts + UART_LSR) & UART_LSR_DR)) {
	184	if (--tmout == 0) {
	185	pr_warn("time out while waiting for input.\n");
	186	return 0xff;
	187	}
	188	udelay(1);
	189	}
	190	return inb_p(speakup_info.port_tts + UART_RX);
	191	}
	192	EXPORT_SYMBOL_GPL(spk_serial_in);
	193
	194	unsigned char spk_serial_in_nowait(void)
	195	{
	196	unsigned char lsr;
	197
	198	lsr = inb_p(speakup_info.port_tts + UART_LSR);
	199	if (!(lsr & UART_LSR_DR))
	200	return 0;
	201	return inb_p(speakup_info.port_tts + UART_RX);
	202	}
	203	EXPORT_SYMBOL_GPL(spk_serial_in_nowait);
	204
	205	int spk_serial_out(const char ch)
	206	{
ca2beaf8	207	if (synth->alive && spk_wait_for_xmitr()) {
c6e3fd22 WH	208	outb_p(ch, speakup_info.port_tts);
	209	return 1;
	210	}
	211	return 0;
	212	}
	213	EXPORT_SYMBOL_GPL(spk_serial_out);
	214
	215	void spk_serial_release(void)
	216	{
	217	if (speakup_info.port_tts == 0)
	218	return;
	219	synth_release_region(speakup_info.port_tts, 8);
	220	speakup_info.port_tts = 0;
	221	}
	222	EXPORT_SYMBOL_GPL(spk_serial_release);