Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3) #include <linux/ioport.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5) #include "spk_types.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) #include "speakup.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #include "spk_priv.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include "serialio.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/serial_core.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) /* WARNING:  Do not change this to <linux/serial.h> without testing that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12)  * SERIAL_PORT_DFNS does get defined to the appropriate value.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <asm/serial.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #ifndef SERIAL_PORT_DFNS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #define SERIAL_PORT_DFNS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) static void start_serial_interrupt(int irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) static const struct old_serial_port rs_table[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 	SERIAL_PORT_DFNS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) static const struct old_serial_port *serstate;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) static int timeouts;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) static int spk_serial_out(struct spk_synth *in_synth, const char ch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) static void spk_serial_send_xchar(char ch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) static void spk_serial_tiocmset(unsigned int set, unsigned int clear);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) static unsigned char spk_serial_in(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) static unsigned char spk_serial_in_nowait(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) static void spk_serial_flush_buffer(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) static int spk_serial_wait_for_xmitr(struct spk_synth *in_synth);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) struct spk_io_ops spk_serial_io_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	.synth_out = spk_serial_out,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	.send_xchar = spk_serial_send_xchar,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	.tiocmset = spk_serial_tiocmset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	.synth_in = spk_serial_in,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	.synth_in_nowait = spk_serial_in_nowait,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	.flush_buffer = spk_serial_flush_buffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	.wait_for_xmitr = spk_serial_wait_for_xmitr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) EXPORT_SYMBOL_GPL(spk_serial_io_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) const struct old_serial_port *spk_serial_init(int index)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	int baud = 9600, quot = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	unsigned int cval = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	int cflag = CREAD | HUPCL | CLOCAL | B9600 | CS8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	const struct old_serial_port *ser;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	if (index >= ARRAY_SIZE(rs_table)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 		pr_info("no port info for ttyS%d\n", index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	ser = rs_table + index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	/*	Divisor, bytesize and parity */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	quot = ser->baud_base / baud;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	cval = cflag & (CSIZE | CSTOPB);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) #if defined(__powerpc__) || defined(__alpha__)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	cval >>= 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) #else /* !__powerpc__ && !__alpha__ */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	cval >>= 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) #endif /* !__powerpc__ && !__alpha__ */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	if (cflag & PARENB)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 		cval |= UART_LCR_PARITY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	if (!(cflag & PARODD))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 		cval |= UART_LCR_EPAR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	if (synth_request_region(ser->port, 8)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 		/* try to take it back. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 		pr_info("Ports not available, trying to steal them\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 		__release_region(&ioport_resource, ser->port, 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		err = synth_request_region(ser->port, 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 		if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 			pr_warn("Unable to allocate port at %x, errno %i",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 				ser->port, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 			return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	/*	Disable UART interrupts, set DTR and RTS high
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	 *	and set speed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	outb(cval | UART_LCR_DLAB, ser->port + UART_LCR);	/* set DLAB */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	outb(quot & 0xff, ser->port + UART_DLL);	/* LS of divisor */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	outb(quot >> 8, ser->port + UART_DLM);		/* MS of divisor */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	outb(cval, ser->port + UART_LCR);		/* reset DLAB */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	/* Turn off Interrupts */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	outb(0, ser->port + UART_IER);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	outb(UART_MCR_DTR | UART_MCR_RTS, ser->port + UART_MCR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	/* If we read 0xff from the LSR, there is no UART here. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	if (inb(ser->port + UART_LSR) == 0xff) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 		synth_release_region(ser->port, 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 		serstate = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	mdelay(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	speakup_info.port_tts = ser->port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	serstate = ser;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	start_serial_interrupt(ser->irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	return ser;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) static irqreturn_t synth_readbuf_handler(int irq, void *dev_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	int c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	spin_lock_irqsave(&speakup_info.spinlock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	while (inb_p(speakup_info.port_tts + UART_LSR) & UART_LSR_DR) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 		c = inb_p(speakup_info.port_tts + UART_RX);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 		synth->read_buff_add((u_char)c);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	spin_unlock_irqrestore(&speakup_info.spinlock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) static void start_serial_interrupt(int irq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	int rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	if (!synth->read_buff_add)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	rv = request_irq(irq, synth_readbuf_handler, IRQF_SHARED,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 			 "serial", (void *)synth_readbuf_handler);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	if (rv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 		pr_err("Unable to request Speakup serial I R Q\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	/* Set MCR */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	outb(UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	     speakup_info.port_tts + UART_MCR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	/* Turn on Interrupts */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	outb(UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	     speakup_info.port_tts + UART_IER);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	inb(speakup_info.port_tts + UART_LSR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	inb(speakup_info.port_tts + UART_RX);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	inb(speakup_info.port_tts + UART_IIR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	inb(speakup_info.port_tts + UART_MSR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	outb(1, speakup_info.port_tts + UART_FCR);	/* Turn FIFO On */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) static void spk_serial_send_xchar(char ch)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	int timeout = SPK_XMITR_TIMEOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	while (spk_serial_tx_busy()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		if (!--timeout)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 		udelay(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	outb(ch, speakup_info.port_tts);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) static void spk_serial_tiocmset(unsigned int set, unsigned int clear)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	int old = inb(speakup_info.port_tts + UART_MCR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	outb((old & ~clear) | set, speakup_info.port_tts + UART_MCR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) int spk_serial_synth_probe(struct spk_synth *synth)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	const struct old_serial_port *ser;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	int failed = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	if ((synth->ser >= SPK_LO_TTY) && (synth->ser <= SPK_HI_TTY)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 		ser = spk_serial_init(synth->ser);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 		if (!ser) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 			failed = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 			outb_p(0, ser->port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 			mdelay(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 			outb_p('\r', ser->port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 		failed = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 		pr_warn("ttyS%i is an invalid port\n", synth->ser);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	if (failed) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		pr_info("%s: not found\n", synth->long_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 		return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	pr_info("%s: ttyS%i, Driver Version %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 		synth->long_name, synth->ser, synth->version);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	synth->alive = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) EXPORT_SYMBOL_GPL(spk_serial_synth_probe);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) void spk_stop_serial_interrupt(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	if (speakup_info.port_tts == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	if (!synth->read_buff_add)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	/* Turn off interrupts */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	outb(0, speakup_info.port_tts + UART_IER);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	/* Free IRQ */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	free_irq(serstate->irq, (void *)synth_readbuf_handler);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) EXPORT_SYMBOL_GPL(spk_stop_serial_interrupt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) static int spk_serial_wait_for_xmitr(struct spk_synth *in_synth)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	int tmout = SPK_XMITR_TIMEOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	if ((in_synth->alive) && (timeouts >= NUM_DISABLE_TIMEOUTS)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 		pr_warn("%s: too many timeouts, deactivating speakup\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 			in_synth->long_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 		in_synth->alive = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 		/* No synth any more, so nobody will restart TTYs, and we thus
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 		 * need to do it ourselves.  Now that there is no synth we can
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 		 * let application flood anyway
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 		speakup_start_ttys();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 		timeouts = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	while (spk_serial_tx_busy()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 		if (--tmout == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 			pr_warn("%s: timed out (tx busy)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 				in_synth->long_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 			timeouts++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 			return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 		udelay(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	tmout = SPK_CTS_TIMEOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	while (!((inb_p(speakup_info.port_tts + UART_MSR)) & UART_MSR_CTS)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 		/* CTS */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 		if (--tmout == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 			timeouts++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 			return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 		udelay(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	timeouts = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) static unsigned char spk_serial_in(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	int tmout = SPK_SERIAL_TIMEOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	while (!(inb_p(speakup_info.port_tts + UART_LSR) & UART_LSR_DR)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 		if (--tmout == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 			pr_warn("time out while waiting for input.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 			return 0xff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 		udelay(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	return inb_p(speakup_info.port_tts + UART_RX);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) static unsigned char spk_serial_in_nowait(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	unsigned char lsr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	lsr = inb_p(speakup_info.port_tts + UART_LSR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	if (!(lsr & UART_LSR_DR))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	return inb_p(speakup_info.port_tts + UART_RX);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) static void spk_serial_flush_buffer(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	/* TODO: flush the UART 16550 buffer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) static int spk_serial_out(struct spk_synth *in_synth, const char ch)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	if (in_synth->alive && spk_serial_wait_for_xmitr(in_synth)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 		outb_p(ch, speakup_info.port_tts);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) const char *spk_serial_synth_immediate(struct spk_synth *synth,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 				       const char *buff)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	u_char ch;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	while ((ch = *buff)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 		if (ch == '\n')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 			ch = synth->procspeech;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 		if (spk_serial_wait_for_xmitr(synth))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 			outb(ch, speakup_info.port_tts);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 			return buff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 		buff++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 	return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) EXPORT_SYMBOL_GPL(spk_serial_synth_immediate);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) void spk_serial_release(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	spk_stop_serial_interrupt();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	if (speakup_info.port_tts == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	synth_release_region(speakup_info.port_tts, 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	speakup_info.port_tts = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) EXPORT_SYMBOL_GPL(spk_serial_release);