123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182 |
- /* vim: tabstop=4 shiftwidth=4 noexpandtab
- * This file is part of ToaruOS and is released under the terms
- * of the NCSA / University of Illinois License - see LICENSE.md
- * Copyright (C) 2014-2018 K. Lange
- *
- * Serial communication device
- *
- */
- #include <kernel/system.h>
- #include <kernel/fs.h>
- #include <kernel/pipe.h>
- #include <kernel/logging.h>
- #include <kernel/args.h>
- #include <kernel/module.h>
- #include <kernel/pty.h>
- #include <kernel/printf.h>
- #define SERIAL_PORT_A 0x3F8
- #define SERIAL_PORT_B 0x2F8
- #define SERIAL_PORT_C 0x3E8
- #define SERIAL_PORT_D 0x2E8
- #define SERIAL_IRQ_AC 4
- #define SERIAL_IRQ_BD 3
- static pty_t * _serial_port_pty_a = NULL;
- static pty_t * _serial_port_pty_b = NULL;
- static pty_t * _serial_port_pty_c = NULL;
- static pty_t * _serial_port_pty_d = NULL;
- static pty_t ** pty_for_port(int port) {
- switch (port) {
- case SERIAL_PORT_A: return &_serial_port_pty_a;
- case SERIAL_PORT_B: return &_serial_port_pty_b;
- case SERIAL_PORT_C: return &_serial_port_pty_c;
- case SERIAL_PORT_D: return &_serial_port_pty_d;
- }
- __builtin_unreachable();
- }
- static int serial_rcvd(int device) {
- return inportb(device + 5) & 1;
- }
- static char serial_recv(int device) {
- while (serial_rcvd(device) == 0) ;
- return inportb(device);
- }
- static int serial_transmit_empty(int device) {
- return inportb(device + 5) & 0x20;
- }
- static void serial_send(int device, char out) {
- while (serial_transmit_empty(device) == 0);
- outportb(device, out);
- }
- static int serial_handler_ac(struct regs *r) {
- char serial;
- int port = 0;
- if (inportb(SERIAL_PORT_A+1) & 0x01) {
- port = SERIAL_PORT_A;
- } else {
- port = SERIAL_PORT_C;
- }
- serial = serial_recv(port);
- irq_ack(SERIAL_IRQ_AC);
- tty_input_process(*pty_for_port(port), serial);
- return 1;
- }
- static int serial_handler_bd(struct regs *r) {
- char serial;
- int port = 0;
- debug_print(NOTICE, "Received something on secondary port");
- if (inportb(SERIAL_PORT_B+1) & 0x01) {
- port = SERIAL_PORT_B;
- } else {
- port = SERIAL_PORT_D;
- }
- serial = serial_recv(port);
- irq_ack(SERIAL_IRQ_BD);
- tty_input_process(*pty_for_port(port), serial);
- return 1;
- }
- static void serial_enable(int port) {
- outportb(port + 1, 0x00); /* Disable interrupts */
- outportb(port + 3, 0x80); /* Enable divisor mode */
- outportb(port + 0, 0x01); /* Div Low: 01 Set the port to 115200 bps */
- outportb(port + 1, 0x00); /* Div High: 00 */
- outportb(port + 3, 0x03); /* Disable divisor mode, set parity */
- outportb(port + 2, 0xC7); /* Enable FIFO and clear */
- outportb(port + 4, 0x0B); /* Enable interrupts */
- outportb(port + 1, 0x01); /* Enable interrupts */
- }
- static int have_installed_ac = 0;
- static int have_installed_bd = 0;
- static void serial_write_out(pty_t * pty, uint8_t c) {
- if (pty == _serial_port_pty_a) serial_send(SERIAL_PORT_A, c);
- if (pty == _serial_port_pty_b) serial_send(SERIAL_PORT_B, c);
- if (pty == _serial_port_pty_c) serial_send(SERIAL_PORT_C, c);
- if (pty == _serial_port_pty_d) serial_send(SERIAL_PORT_D, c);
- }
- #define DEV_PATH "/dev/"
- #define TTY_A "ttyS0"
- #define TTY_B "ttyS1"
- #define TTY_C "ttyS2"
- #define TTY_D "ttyS3"
- static void serial_fill_name(pty_t * pty, char * name) {
- if (pty == _serial_port_pty_a) sprintf(name, DEV_PATH TTY_A);
- if (pty == _serial_port_pty_b) sprintf(name, DEV_PATH TTY_B);
- if (pty == _serial_port_pty_c) sprintf(name, DEV_PATH TTY_C);
- if (pty == _serial_port_pty_d) sprintf(name, DEV_PATH TTY_D);
- }
- static fs_node_t * serial_device_create(int port) {
- pty_t * pty = pty_new(NULL);
- *pty_for_port(port) = pty;
- pty->write_out = serial_write_out;
- pty->fill_name = serial_fill_name;
- serial_enable(port);
- if (port == SERIAL_PORT_A || port == SERIAL_PORT_C) {
- if (!have_installed_ac) {
- irq_install_handler(SERIAL_IRQ_AC, serial_handler_ac, "serial ac");
- have_installed_ac = 1;
- }
- } else {
- if (!have_installed_bd) {
- irq_install_handler(SERIAL_IRQ_BD, serial_handler_bd, "serial bd");
- have_installed_bd = 1;
- }
- }
- return pty->slave;
- }
- static int serial_mount_devices(void) {
- fs_node_t * ttyS0 = serial_device_create(SERIAL_PORT_A); vfs_mount(DEV_PATH TTY_A, ttyS0);
- fs_node_t * ttyS1 = serial_device_create(SERIAL_PORT_B); vfs_mount(DEV_PATH TTY_B, ttyS1);
- fs_node_t * ttyS2 = serial_device_create(SERIAL_PORT_C); vfs_mount(DEV_PATH TTY_C, ttyS2);
- fs_node_t * ttyS3 = serial_device_create(SERIAL_PORT_D); vfs_mount(DEV_PATH TTY_D, ttyS3);
- char * c;
- if ((c = args_value("logtoserial"))) {
- debug_file = ttyS0;
- if (!strcmp(c,"INFO") || !strcmp(c,"info")) {
- debug_level = INFO;
- } else if (!strcmp(c,"NOTICE") || !strcmp(c,"notice")) {
- debug_level = NOTICE;
- } else if (!strcmp(c,"WARNING") || !strcmp(c,"warning")) {
- debug_level = WARNING;
- } else if (!strcmp(c,"ERROR") || !strcmp(c,"error")) {
- debug_level = ERROR;
- } else if (!strcmp(c,"CRITICAL") || !strcmp(c,"critical")) {
- debug_level = CRITICAL;
- } else if (!strcmp(c,"INSANE") || !strcmp(c,"insane")) {
- debug_level = INSANE;
- } else {
- debug_level = atoi(c);
- }
- debug_print(NOTICE, "Serial logging enabled at level %d.", debug_level);
- }
- return 0;
- }
- static int serial_finalize(void) {
- return 0;
- }
- MODULE_DEF(serial, serial_mount_devices, serial_finalize);
|