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1// SPDX-License-Identifier: GPL-2.02#include <linux/interrupt.h>3#include <linux/ioport.h>4 5#include "spk_types.h"6#include "speakup.h"7#include "spk_priv.h"8#include "serialio.h"9 10#include <linux/serial_core.h>11/* WARNING: Do not change this to <linux/serial.h> without testing that12 * SERIAL_PORT_DFNS does get defined to the appropriate value.13 */14#include <asm/serial.h>15 16#ifndef SERIAL_PORT_DFNS17#define SERIAL_PORT_DFNS18#endif19 20static void start_serial_interrupt(int irq);21 22static const struct old_serial_port rs_table[] = {23 SERIAL_PORT_DFNS24};25 26static const struct old_serial_port *serstate;27static int timeouts;28 29static int spk_serial_out(struct spk_synth *in_synth, const char ch);30static void spk_serial_send_xchar(struct spk_synth *in_synth, char ch);31static void spk_serial_tiocmset(struct spk_synth *in_synth, unsigned int set, unsigned int clear);32static unsigned char spk_serial_in(struct spk_synth *in_synth);33static unsigned char spk_serial_in_nowait(struct spk_synth *in_synth);34static void spk_serial_flush_buffer(struct spk_synth *in_synth);35static int spk_serial_wait_for_xmitr(struct spk_synth *in_synth);36 37struct spk_io_ops spk_serial_io_ops = {38 .synth_out = spk_serial_out,39 .send_xchar = spk_serial_send_xchar,40 .tiocmset = spk_serial_tiocmset,41 .synth_in = spk_serial_in,42 .synth_in_nowait = spk_serial_in_nowait,43 .flush_buffer = spk_serial_flush_buffer,44 .wait_for_xmitr = spk_serial_wait_for_xmitr,45};46EXPORT_SYMBOL_GPL(spk_serial_io_ops);47 48const struct old_serial_port *spk_serial_init(int index)49{50 int baud = 9600, quot = 0;51 unsigned int cval = 0;52 int cflag = CREAD | HUPCL | CLOCAL | B9600 | CS8;53 const struct old_serial_port *ser;54 int err;55 56 if (index >= ARRAY_SIZE(rs_table)) {57 pr_info("no port info for ttyS%d\n", index);58 return NULL;59 }60 ser = rs_table + index;61 62 /* Divisor, byte size and parity */63 quot = ser->baud_base / baud;64 cval = cflag & (CSIZE | CSTOPB);65#if defined(__powerpc__) || defined(__alpha__)66 cval >>= 8;67#else /* !__powerpc__ && !__alpha__ */68 cval >>= 4;69#endif /* !__powerpc__ && !__alpha__ */70 if (cflag & PARENB)71 cval |= UART_LCR_PARITY;72 if (!(cflag & PARODD))73 cval |= UART_LCR_EPAR;74 if (synth_request_region(ser->port, 8)) {75 /* try to take it back. */76 pr_info("Ports not available, trying to steal them\n");77 __release_region(&ioport_resource, ser->port, 8);78 err = synth_request_region(ser->port, 8);79 if (err) {80 pr_warn("Unable to allocate port at %x, errno %i",81 ser->port, err);82 return NULL;83 }84 }85 86 /* Disable UART interrupts, set DTR and RTS high87 * and set speed.88 */89 outb(cval | UART_LCR_DLAB, ser->port + UART_LCR); /* set DLAB */90 outb(quot & 0xff, ser->port + UART_DLL); /* LS of divisor */91 outb(quot >> 8, ser->port + UART_DLM); /* MS of divisor */92 outb(cval, ser->port + UART_LCR); /* reset DLAB */93 94 /* Turn off Interrupts */95 outb(0, ser->port + UART_IER);96 outb(UART_MCR_DTR | UART_MCR_RTS, ser->port + UART_MCR);97 98 /* If we read 0xff from the LSR, there is no UART here. */99 if (inb(ser->port + UART_LSR) == 0xff) {100 synth_release_region(ser->port, 8);101 serstate = NULL;102 return NULL;103 }104 105 mdelay(1);106 speakup_info.port_tts = ser->port;107 serstate = ser;108 109 start_serial_interrupt(ser->irq);110 111 return ser;112}113 114static irqreturn_t synth_readbuf_handler(int irq, void *dev_id)115{116 unsigned long flags;117 int c;118 119 spin_lock_irqsave(&speakup_info.spinlock, flags);120 while (inb_p(speakup_info.port_tts + UART_LSR) & UART_LSR_DR) {121 c = inb_p(speakup_info.port_tts + UART_RX);122 synth->read_buff_add((u_char)c);123 }124 spin_unlock_irqrestore(&speakup_info.spinlock, flags);125 return IRQ_HANDLED;126}127 128static void start_serial_interrupt(int irq)129{130 int rv;131 132 if (!synth->read_buff_add)133 return;134 135 rv = request_irq(irq, synth_readbuf_handler, IRQF_SHARED,136 "serial", (void *)synth_readbuf_handler);137 138 if (rv)139 pr_err("Unable to request Speakup serial I R Q\n");140 /* Set MCR */141 outb(UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2,142 speakup_info.port_tts + UART_MCR);143 /* Turn on Interrupts */144 outb(UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI,145 speakup_info.port_tts + UART_IER);146 inb(speakup_info.port_tts + UART_LSR);147 inb(speakup_info.port_tts + UART_RX);148 inb(speakup_info.port_tts + UART_IIR);149 inb(speakup_info.port_tts + UART_MSR);150 outb(1, speakup_info.port_tts + UART_FCR); /* Turn FIFO On */151}152 153static void spk_serial_send_xchar(struct spk_synth *synth, char ch)154{155 int timeout = SPK_XMITR_TIMEOUT;156 157 while (spk_serial_tx_busy()) {158 if (!--timeout)159 break;160 udelay(1);161 }162 outb(ch, speakup_info.port_tts);163}164 165static void spk_serial_tiocmset(struct spk_synth *in_synth, unsigned int set, unsigned int clear)166{167 int old = inb(speakup_info.port_tts + UART_MCR);168 169 outb((old & ~clear) | set, speakup_info.port_tts + UART_MCR);170}171 172int spk_serial_synth_probe(struct spk_synth *synth)173{174 const struct old_serial_port *ser;175 int failed = 0;176 177 if ((synth->ser >= SPK_LO_TTY) && (synth->ser <= SPK_HI_TTY)) {178 ser = spk_serial_init(synth->ser);179 if (!ser) {180 failed = -1;181 } else {182 outb_p(0, ser->port);183 mdelay(1);184 outb_p('\r', ser->port);185 }186 } else {187 failed = -1;188 pr_warn("ttyS%i is an invalid port\n", synth->ser);189 }190 if (failed) {191 pr_info("%s: not found\n", synth->long_name);192 return -ENODEV;193 }194 pr_info("%s: ttyS%i, Driver Version %s\n",195 synth->long_name, synth->ser, synth->version);196 synth->alive = 1;197 return 0;198}199EXPORT_SYMBOL_GPL(spk_serial_synth_probe);200 201void spk_stop_serial_interrupt(void)202{203 if (speakup_info.port_tts == 0)204 return;205 206 if (!synth->read_buff_add)207 return;208 209 /* Turn off interrupts */210 outb(0, speakup_info.port_tts + UART_IER);211 /* Free IRQ */212 free_irq(serstate->irq, (void *)synth_readbuf_handler);213}214EXPORT_SYMBOL_GPL(spk_stop_serial_interrupt);215 216static int spk_serial_wait_for_xmitr(struct spk_synth *in_synth)217{218 int tmout = SPK_XMITR_TIMEOUT;219 220 if ((in_synth->alive) && (timeouts >= NUM_DISABLE_TIMEOUTS)) {221 pr_warn("%s: too many timeouts, deactivating speakup\n",222 in_synth->long_name);223 in_synth->alive = 0;224 /* No synth any more, so nobody will restart TTYs, and we thus225 * need to do it ourselves. Now that there is no synth we can226 * let application flood anyway227 */228 speakup_start_ttys();229 timeouts = 0;230 return 0;231 }232 while (spk_serial_tx_busy()) {233 if (--tmout == 0) {234 pr_warn("%s: timed out (tx busy)\n",235 in_synth->long_name);236 timeouts++;237 return 0;238 }239 udelay(1);240 }241 tmout = SPK_CTS_TIMEOUT;242 while (!((inb_p(speakup_info.port_tts + UART_MSR)) & UART_MSR_CTS)) {243 /* CTS */244 if (--tmout == 0) {245 timeouts++;246 return 0;247 }248 udelay(1);249 }250 timeouts = 0;251 return 1;252}253 254static unsigned char spk_serial_in(struct spk_synth *in_synth)255{256 int tmout = SPK_SERIAL_TIMEOUT;257 258 while (!(inb_p(speakup_info.port_tts + UART_LSR) & UART_LSR_DR)) {259 if (--tmout == 0) {260 pr_warn("time out while waiting for input.\n");261 return 0xff;262 }263 udelay(1);264 }265 return inb_p(speakup_info.port_tts + UART_RX);266}267 268static unsigned char spk_serial_in_nowait(struct spk_synth *in_synth)269{270 unsigned char lsr;271 272 lsr = inb_p(speakup_info.port_tts + UART_LSR);273 if (!(lsr & UART_LSR_DR))274 return 0;275 return inb_p(speakup_info.port_tts + UART_RX);276}277 278static void spk_serial_flush_buffer(struct spk_synth *in_synth)279{280 /* TODO: flush the UART 16550 buffer */281}282 283static int spk_serial_out(struct spk_synth *in_synth, const char ch)284{285 if (in_synth->alive && spk_serial_wait_for_xmitr(in_synth)) {286 outb_p(ch, speakup_info.port_tts);287 return 1;288 }289 return 0;290}291 292const char *spk_serial_synth_immediate(struct spk_synth *synth,293 const char *buff)294{295 u_char ch;296 297 while ((ch = *buff)) {298 if (ch == '\n')299 ch = synth->procspeech;300 if (spk_serial_wait_for_xmitr(synth))301 outb(ch, speakup_info.port_tts);302 else303 return buff;304 buff++;305 }306 return NULL;307}308EXPORT_SYMBOL_GPL(spk_serial_synth_immediate);309 310void spk_serial_release(struct spk_synth *synth)311{312 spk_stop_serial_interrupt();313 if (speakup_info.port_tts == 0)314 return;315 synth_release_region(speakup_info.port_tts, 8);316 speakup_info.port_tts = 0;317}318EXPORT_SYMBOL_GPL(spk_serial_release);319