Contributors: 76
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Peter Hurley |
1273 |
32.40% |
16 |
9.58% |
| Russell King |
652 |
16.59% |
22 |
13.17% |
| Andy Shevchenko |
614 |
15.63% |
7 |
4.19% |
| David Daney |
115 |
2.93% |
3 |
1.80% |
| Tony Lindgren |
114 |
2.90% |
5 |
2.99% |
| Magnus Damm |
103 |
2.62% |
2 |
1.20% |
| Yoshihiro Yunomae |
96 |
2.44% |
1 |
0.60% |
| Sebastian Andrzej Siewior |
63 |
1.60% |
4 |
2.40% |
| Sean Young |
60 |
1.53% |
3 |
1.80% |
| Darwin Dingel |
56 |
1.43% |
1 |
0.60% |
| Alan Cox |
53 |
1.35% |
4 |
2.40% |
| Ilpo Järvinen |
46 |
1.17% |
5 |
2.99% |
| JiSheng Zhang |
42 |
1.07% |
1 |
0.60% |
| Paul Gortmaker |
29 |
0.74% |
4 |
2.40% |
| Lukas Wunner |
29 |
0.74% |
4 |
2.40% |
| Jamie Iles |
27 |
0.69% |
2 |
1.20% |
| Kees Cook |
27 |
0.69% |
1 |
0.60% |
| David Woodhouse |
26 |
0.66% |
2 |
1.20% |
| Matwey V. Kornilov |
26 |
0.66% |
1 |
0.60% |
| Yegor Yefremov |
25 |
0.64% |
1 |
0.60% |
| Linus Torvalds (pre-git) |
23 |
0.59% |
9 |
5.39% |
| Andrew Morton |
23 |
0.59% |
3 |
1.80% |
| Wan Ahmad Zainie |
22 |
0.56% |
1 |
0.60% |
| Ed Blake |
20 |
0.51% |
1 |
0.60% |
| Christoph Hellwig |
18 |
0.46% |
1 |
0.60% |
| Philippe Langlais |
18 |
0.46% |
1 |
0.60% |
| Jan Kiszka |
17 |
0.43% |
1 |
0.60% |
| Josh Boyer |
17 |
0.43% |
1 |
0.60% |
| Dan J Williams |
17 |
0.43% |
2 |
1.20% |
| Manuel Lauss |
17 |
0.43% |
2 |
1.20% |
| Helge Deller |
16 |
0.41% |
1 |
0.60% |
| Ricardo Ribalda Delgado |
12 |
0.31% |
2 |
1.20% |
| Jiri Slaby |
12 |
0.31% |
3 |
1.80% |
| Måns Rullgård |
12 |
0.31% |
1 |
0.60% |
| Yinghai Lu |
12 |
0.31% |
1 |
0.60% |
| Linus Torvalds |
11 |
0.28% |
3 |
1.80% |
| Heikki Krogerus |
11 |
0.28% |
1 |
0.60% |
| Maciej S. Szmigiero |
11 |
0.28% |
1 |
0.60% |
| Breno Leitão |
10 |
0.25% |
1 |
0.60% |
| Masahiro Yamada |
9 |
0.23% |
1 |
0.60% |
| Arjan van de Ven |
9 |
0.23% |
1 |
0.60% |
| Al Viro |
8 |
0.20% |
2 |
1.20% |
| Will Newton |
8 |
0.20% |
2 |
1.20% |
| Yin Kangkai |
8 |
0.20% |
2 |
1.20% |
| Jingchang Lu |
8 |
0.20% |
1 |
0.60% |
| Christophe Jaillet |
8 |
0.20% |
1 |
0.60% |
| Dave Jones |
8 |
0.20% |
1 |
0.60% |
| Vikram Pandita |
8 |
0.20% |
1 |
0.60% |
| David S. Miller |
7 |
0.18% |
1 |
0.60% |
| Matt Mackall |
7 |
0.18% |
1 |
0.60% |
| Dmitry Torokhov |
5 |
0.13% |
1 |
0.60% |
| Yang Yingliang |
5 |
0.13% |
1 |
0.60% |
| Matt Schulte |
5 |
0.13% |
2 |
1.20% |
| Thomas Gleixner |
5 |
0.13% |
1 |
0.60% |
| Vignesh R |
5 |
0.13% |
2 |
1.20% |
| Jiri Slaby (SUSE) |
4 |
0.10% |
1 |
0.60% |
| Deepak Saxena |
4 |
0.10% |
1 |
0.60% |
| Daniel Drake |
3 |
0.08% |
1 |
0.60% |
| Jason Wessel |
3 |
0.08% |
1 |
0.60% |
| Rabin Vincent |
3 |
0.08% |
1 |
0.60% |
| Steve Youngs |
3 |
0.08% |
1 |
0.60% |
| Allen Pais |
3 |
0.08% |
1 |
0.60% |
| Chuck Ebbert |
2 |
0.05% |
1 |
0.60% |
| Peter Zijlstra |
2 |
0.05% |
1 |
0.60% |
| Sergei Shtylyov |
2 |
0.05% |
1 |
0.60% |
| Kyle McMartin |
2 |
0.05% |
1 |
0.60% |
| He Zhe |
1 |
0.03% |
1 |
0.60% |
| Alexander Sverdlin |
1 |
0.03% |
1 |
0.60% |
| Anton Wuerfel |
1 |
0.03% |
1 |
0.60% |
| Wei Yongjun |
1 |
0.03% |
1 |
0.60% |
| Adrian Bunk |
1 |
0.03% |
1 |
0.60% |
| Greg Kroah-Hartman |
1 |
0.03% |
1 |
0.60% |
| Stephen Warren |
1 |
0.03% |
1 |
0.60% |
| John Ogness |
1 |
0.03% |
1 |
0.60% |
| David Howells |
1 |
0.03% |
1 |
0.60% |
| Randy Dunlap |
1 |
0.03% |
1 |
0.60% |
| Total |
3929 |
|
167 |
|
// SPDX-License-Identifier: GPL-2.0+
/*
* Universal/legacy driver for 8250/16550-type serial ports
*
* Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
*
* Copyright (C) 2001 Russell King.
*
* Supports:
* early_serial_setup() ports
* userspace-configurable "phantom" ports
* serial8250_register_8250_port() ports
*/
#include <linux/acpi.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/console.h>
#include <linux/sysrq.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/tty.h>
#include <linux/ratelimit.h>
#include <linux/tty_flip.h>
#include <linux/serial.h>
#include <linux/serial_8250.h>
#include <linux/nmi.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/string_helpers.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include <asm/irq.h>
#include "8250.h"
#define PASS_LIMIT 512
struct irq_info {
struct hlist_node node;
int irq;
spinlock_t lock; /* Protects list not the hash */
struct list_head *head;
};
#define NR_IRQ_HASH 32 /* Can be adjusted later */
static struct hlist_head irq_lists[NR_IRQ_HASH];
static DEFINE_MUTEX(hash_mutex); /* Used to walk the hash */
/*
* This is the serial driver's interrupt routine.
*
* Arjan thinks the old way was overly complex, so it got simplified.
* Alan disagrees, saying that need the complexity to handle the weird
* nature of ISA shared interrupts. (This is a special exception.)
*
* In order to handle ISA shared interrupts properly, we need to check
* that all ports have been serviced, and therefore the ISA interrupt
* line has been de-asserted.
*
* This means we need to loop through all ports. checking that they
* don't have an interrupt pending.
*/
static irqreturn_t serial8250_interrupt(int irq, void *dev_id)
{
struct irq_info *i = dev_id;
struct list_head *l, *end = NULL;
int pass_counter = 0, handled = 0;
pr_debug("%s(%d): start\n", __func__, irq);
spin_lock(&i->lock);
l = i->head;
do {
struct uart_8250_port *up;
struct uart_port *port;
up = list_entry(l, struct uart_8250_port, list);
port = &up->port;
if (port->handle_irq(port)) {
handled = 1;
end = NULL;
} else if (end == NULL)
end = l;
l = l->next;
if (l == i->head && pass_counter++ > PASS_LIMIT)
break;
} while (l != end);
spin_unlock(&i->lock);
pr_debug("%s(%d): end\n", __func__, irq);
return IRQ_RETVAL(handled);
}
/*
* To support ISA shared interrupts, we need to have one interrupt
* handler that ensures that the IRQ line has been deasserted
* before returning. Failing to do this will result in the IRQ
* line being stuck active, and, since ISA irqs are edge triggered,
* no more IRQs will be seen.
*/
static void serial_do_unlink(struct irq_info *i, struct uart_8250_port *up)
{
spin_lock_irq(&i->lock);
if (!list_empty(i->head)) {
if (i->head == &up->list)
i->head = i->head->next;
list_del(&up->list);
} else {
BUG_ON(i->head != &up->list);
i->head = NULL;
}
spin_unlock_irq(&i->lock);
/* List empty so throw away the hash node */
if (i->head == NULL) {
hlist_del(&i->node);
kfree(i);
}
}
static int serial_link_irq_chain(struct uart_8250_port *up)
{
struct hlist_head *h;
struct irq_info *i;
int ret;
mutex_lock(&hash_mutex);
h = &irq_lists[up->port.irq % NR_IRQ_HASH];
hlist_for_each_entry(i, h, node)
if (i->irq == up->port.irq)
break;
if (i == NULL) {
i = kzalloc(sizeof(struct irq_info), GFP_KERNEL);
if (i == NULL) {
mutex_unlock(&hash_mutex);
return -ENOMEM;
}
spin_lock_init(&i->lock);
i->irq = up->port.irq;
hlist_add_head(&i->node, h);
}
mutex_unlock(&hash_mutex);
spin_lock_irq(&i->lock);
if (i->head) {
list_add(&up->list, i->head);
spin_unlock_irq(&i->lock);
ret = 0;
} else {
INIT_LIST_HEAD(&up->list);
i->head = &up->list;
spin_unlock_irq(&i->lock);
ret = request_irq(up->port.irq, serial8250_interrupt,
up->port.irqflags, up->port.name, i);
if (ret < 0)
serial_do_unlink(i, up);
}
return ret;
}
static void serial_unlink_irq_chain(struct uart_8250_port *up)
{
struct irq_info *i;
struct hlist_head *h;
mutex_lock(&hash_mutex);
h = &irq_lists[up->port.irq % NR_IRQ_HASH];
hlist_for_each_entry(i, h, node)
if (i->irq == up->port.irq)
break;
BUG_ON(i == NULL);
BUG_ON(i->head == NULL);
if (list_empty(i->head))
free_irq(up->port.irq, i);
serial_do_unlink(i, up);
mutex_unlock(&hash_mutex);
}
/*
* This function is used to handle ports that do not have an
* interrupt. This doesn't work very well for 16450's, but gives
* barely passable results for a 16550A. (Although at the expense
* of much CPU overhead).
*/
static void serial8250_timeout(struct timer_list *t)
{
struct uart_8250_port *up = from_timer(up, t, timer);
up->port.handle_irq(&up->port);
mod_timer(&up->timer, jiffies + uart_poll_timeout(&up->port));
}
static void serial8250_backup_timeout(struct timer_list *t)
{
struct uart_8250_port *up = from_timer(up, t, timer);
unsigned int iir, ier = 0, lsr;
unsigned long flags;
uart_port_lock_irqsave(&up->port, &flags);
/*
* Must disable interrupts or else we risk racing with the interrupt
* based handler.
*/
if (up->port.irq) {
ier = serial_in(up, UART_IER);
serial_out(up, UART_IER, 0);
}
iir = serial_in(up, UART_IIR);
/*
* This should be a safe test for anyone who doesn't trust the
* IIR bits on their UART, but it's specifically designed for
* the "Diva" UART used on the management processor on many HP
* ia64 and parisc boxes.
*/
lsr = serial_lsr_in(up);
if ((iir & UART_IIR_NO_INT) && (up->ier & UART_IER_THRI) &&
(!kfifo_is_empty(&up->port.state->port.xmit_fifo) ||
up->port.x_char) &&
(lsr & UART_LSR_THRE)) {
iir &= ~(UART_IIR_ID | UART_IIR_NO_INT);
iir |= UART_IIR_THRI;
}
if (!(iir & UART_IIR_NO_INT))
serial8250_tx_chars(up);
if (up->port.irq)
serial_out(up, UART_IER, ier);
uart_port_unlock_irqrestore(&up->port, flags);
/* Standard timer interval plus 0.2s to keep the port running */
mod_timer(&up->timer,
jiffies + uart_poll_timeout(&up->port) + HZ / 5);
}
static void univ8250_setup_timer(struct uart_8250_port *up)
{
struct uart_port *port = &up->port;
/*
* The above check will only give an accurate result the first time
* the port is opened so this value needs to be preserved.
*/
if (up->bugs & UART_BUG_THRE) {
pr_debug("%s - using backup timer\n", port->name);
up->timer.function = serial8250_backup_timeout;
mod_timer(&up->timer, jiffies +
uart_poll_timeout(port) + HZ / 5);
}
/*
* If the "interrupt" for this port doesn't correspond with any
* hardware interrupt, we use a timer-based system. The original
* driver used to do this with IRQ0.
*/
if (!port->irq)
mod_timer(&up->timer, jiffies + uart_poll_timeout(port));
}
static int univ8250_setup_irq(struct uart_8250_port *up)
{
struct uart_port *port = &up->port;
if (port->irq)
return serial_link_irq_chain(up);
return 0;
}
static void univ8250_release_irq(struct uart_8250_port *up)
{
struct uart_port *port = &up->port;
del_timer_sync(&up->timer);
up->timer.function = serial8250_timeout;
if (port->irq)
serial_unlink_irq_chain(up);
}
const struct uart_ops *univ8250_port_base_ops = NULL;
struct uart_ops univ8250_port_ops;
static const struct uart_8250_ops univ8250_driver_ops = {
.setup_irq = univ8250_setup_irq,
.release_irq = univ8250_release_irq,
.setup_timer = univ8250_setup_timer,
};
static struct uart_8250_port serial8250_ports[UART_NR];
/**
* serial8250_get_port - retrieve struct uart_8250_port
* @line: serial line number
*
* This function retrieves struct uart_8250_port for the specific line.
* This struct *must* *not* be used to perform a 8250 or serial core operation
* which is not accessible otherwise. Its only purpose is to make the struct
* accessible to the runtime-pm callbacks for context suspend/restore.
* The lock assumption made here is none because runtime-pm suspend/resume
* callbacks should not be invoked if there is any operation performed on the
* port.
*/
struct uart_8250_port *serial8250_get_port(int line)
{
return &serial8250_ports[line];
}
EXPORT_SYMBOL_GPL(serial8250_get_port);
static inline void serial8250_apply_quirks(struct uart_8250_port *up)
{
up->port.quirks |= skip_txen_test ? UPQ_NO_TXEN_TEST : 0;
}
struct uart_8250_port *serial8250_setup_port(int index)
{
struct uart_8250_port *up;
if (index >= UART_NR)
return NULL;
up = &serial8250_ports[index];
up->port.line = index;
up->port.port_id = index;
serial8250_init_port(up);
if (!univ8250_port_base_ops)
univ8250_port_base_ops = up->port.ops;
up->port.ops = &univ8250_port_ops;
timer_setup(&up->timer, serial8250_timeout, 0);
up->ops = &univ8250_driver_ops;
serial8250_set_defaults(up);
return up;
}
void __init serial8250_register_ports(struct uart_driver *drv, struct device *dev)
{
int i;
for (i = 0; i < nr_uarts; i++) {
struct uart_8250_port *up = &serial8250_ports[i];
if (up->port.type == PORT_8250_CIR)
continue;
if (up->port.dev)
continue;
up->port.dev = dev;
if (uart_console_registered(&up->port))
pm_runtime_get_sync(up->port.dev);
serial8250_apply_quirks(up);
uart_add_one_port(drv, &up->port);
}
}
#ifdef CONFIG_SERIAL_8250_CONSOLE
static void univ8250_console_write(struct console *co, const char *s,
unsigned int count)
{
struct uart_8250_port *up = &serial8250_ports[co->index];
serial8250_console_write(up, s, count);
}
static int univ8250_console_setup(struct console *co, char *options)
{
struct uart_8250_port *up;
struct uart_port *port;
int retval, i;
/*
* Check whether an invalid uart number has been specified, and
* if so, search for the first available port that does have
* console support.
*/
if (co->index < 0 || co->index >= UART_NR)
co->index = 0;
/*
* If the console is past the initial isa ports, init more ports up to
* co->index as needed and increment nr_uarts accordingly.
*/
for (i = nr_uarts; i <= co->index; i++) {
up = serial8250_setup_port(i);
if (!up)
return -ENODEV;
nr_uarts++;
}
port = &serial8250_ports[co->index].port;
/* link port to console */
port->cons = co;
retval = serial8250_console_setup(port, options, false);
if (retval != 0)
port->cons = NULL;
return retval;
}
static int univ8250_console_exit(struct console *co)
{
struct uart_port *port;
port = &serial8250_ports[co->index].port;
return serial8250_console_exit(port);
}
/**
* univ8250_console_match - non-standard console matching
* @co: registering console
* @name: name from console command line
* @idx: index from console command line
* @options: ptr to option string from console command line
*
* Only attempts to match console command lines of the form:
* console=uart[8250],io|mmio|mmio16|mmio32,<addr>[,<options>]
* console=uart[8250],0x<addr>[,<options>]
* This form is used to register an initial earlycon boot console and
* replace it with the serial8250_console at 8250 driver init.
*
* Performs console setup for a match (as required by interface)
* If no <options> are specified, then assume the h/w is already setup.
*
* Returns 0 if console matches; otherwise non-zero to use default matching
*/
static int univ8250_console_match(struct console *co, char *name, int idx,
char *options)
{
char match[] = "uart"; /* 8250-specific earlycon name */
unsigned char iotype;
resource_size_t addr;
int i;
if (strncmp(name, match, 4) != 0)
return -ENODEV;
if (uart_parse_earlycon(options, &iotype, &addr, &options))
return -ENODEV;
/* try to match the port specified on the command line */
for (i = 0; i < nr_uarts; i++) {
struct uart_port *port = &serial8250_ports[i].port;
if (port->iotype != iotype)
continue;
if ((iotype == UPIO_MEM || iotype == UPIO_MEM16 ||
iotype == UPIO_MEM32 || iotype == UPIO_MEM32BE)
&& (port->mapbase != addr))
continue;
if (iotype == UPIO_PORT && port->iobase != addr)
continue;
co->index = i;
port->cons = co;
return serial8250_console_setup(port, options, true);
}
return -ENODEV;
}
static struct console univ8250_console = {
.name = "ttyS",
.write = univ8250_console_write,
.device = uart_console_device,
.setup = univ8250_console_setup,
.exit = univ8250_console_exit,
.match = univ8250_console_match,
.flags = CON_PRINTBUFFER | CON_ANYTIME,
.index = -1,
.data = &serial8250_reg,
};
static int __init univ8250_console_init(void)
{
if (nr_uarts == 0)
return -ENODEV;
serial8250_isa_init_ports();
register_console(&univ8250_console);
return 0;
}
console_initcall(univ8250_console_init);
#define SERIAL8250_CONSOLE (&univ8250_console)
#else
#define SERIAL8250_CONSOLE NULL
#endif
struct uart_driver serial8250_reg = {
.owner = THIS_MODULE,
.driver_name = "serial",
.dev_name = "ttyS",
.major = TTY_MAJOR,
.minor = 64,
.cons = SERIAL8250_CONSOLE,
};
/*
* early_serial_setup - early registration for 8250 ports
*
* Setup an 8250 port structure prior to console initialisation. Use
* after console initialisation will cause undefined behaviour.
*/
int __init early_serial_setup(struct uart_port *port)
{
struct uart_port *p;
if (port->line >= ARRAY_SIZE(serial8250_ports) || nr_uarts == 0)
return -ENODEV;
serial8250_isa_init_ports();
p = &serial8250_ports[port->line].port;
p->iobase = port->iobase;
p->membase = port->membase;
p->irq = port->irq;
p->irqflags = port->irqflags;
p->uartclk = port->uartclk;
p->fifosize = port->fifosize;
p->regshift = port->regshift;
p->iotype = port->iotype;
p->flags = port->flags;
p->mapbase = port->mapbase;
p->mapsize = port->mapsize;
p->private_data = port->private_data;
p->type = port->type;
p->line = port->line;
serial8250_set_defaults(up_to_u8250p(p));
if (port->serial_in)
p->serial_in = port->serial_in;
if (port->serial_out)
p->serial_out = port->serial_out;
if (port->handle_irq)
p->handle_irq = port->handle_irq;
return 0;
}
/**
* serial8250_suspend_port - suspend one serial port
* @line: serial line number
*
* Suspend one serial port.
*/
void serial8250_suspend_port(int line)
{
struct uart_8250_port *up = &serial8250_ports[line];
struct uart_port *port = &up->port;
if (!console_suspend_enabled && uart_console(port) &&
port->type != PORT_8250) {
unsigned char canary = 0xa5;
serial_out(up, UART_SCR, canary);
if (serial_in(up, UART_SCR) == canary)
up->canary = canary;
}
uart_suspend_port(&serial8250_reg, port);
}
EXPORT_SYMBOL(serial8250_suspend_port);
/**
* serial8250_resume_port - resume one serial port
* @line: serial line number
*
* Resume one serial port.
*/
void serial8250_resume_port(int line)
{
struct uart_8250_port *up = &serial8250_ports[line];
struct uart_port *port = &up->port;
up->canary = 0;
if (up->capabilities & UART_NATSEMI) {
/* Ensure it's still in high speed mode */
serial_port_out(port, UART_LCR, 0xE0);
ns16550a_goto_highspeed(up);
serial_port_out(port, UART_LCR, 0);
port->uartclk = 921600*16;
}
uart_resume_port(&serial8250_reg, port);
}
EXPORT_SYMBOL(serial8250_resume_port);
/*
* serial8250_register_8250_port and serial8250_unregister_port allows for
* 16x50 serial ports to be configured at run-time, to support PCMCIA
* modems and PCI multiport cards.
*/
static DEFINE_MUTEX(serial_mutex);
static struct uart_8250_port *serial8250_find_match_or_unused(const struct uart_port *port)
{
int i;
/*
* First, find a port entry which matches.
*/
for (i = 0; i < nr_uarts; i++)
if (uart_match_port(&serial8250_ports[i].port, port))
return &serial8250_ports[i];
/* try line number first if still available */
i = port->line;
if (i < nr_uarts && serial8250_ports[i].port.type == PORT_UNKNOWN &&
serial8250_ports[i].port.iobase == 0)
return &serial8250_ports[i];
/*
* We didn't find a matching entry, so look for the first
* free entry. We look for one which hasn't been previously
* used (indicated by zero iobase).
*/
for (i = 0; i < nr_uarts; i++)
if (serial8250_ports[i].port.type == PORT_UNKNOWN &&
serial8250_ports[i].port.iobase == 0)
return &serial8250_ports[i];
/*
* That also failed. Last resort is to find any entry which
* doesn't have a real port associated with it.
*/
for (i = 0; i < nr_uarts; i++)
if (serial8250_ports[i].port.type == PORT_UNKNOWN)
return &serial8250_ports[i];
return NULL;
}
static void serial_8250_overrun_backoff_work(struct work_struct *work)
{
struct uart_8250_port *up =
container_of(to_delayed_work(work), struct uart_8250_port,
overrun_backoff);
struct uart_port *port = &up->port;
unsigned long flags;
uart_port_lock_irqsave(port, &flags);
up->ier |= UART_IER_RLSI | UART_IER_RDI;
up->port.read_status_mask |= UART_LSR_DR;
serial_out(up, UART_IER, up->ier);
uart_port_unlock_irqrestore(port, flags);
}
/**
* serial8250_register_8250_port - register a serial port
* @up: serial port template
*
* Configure the serial port specified by the request. If the
* port exists and is in use, it is hung up and unregistered
* first.
*
* The port is then probed and if necessary the IRQ is autodetected
* If this fails an error is returned.
*
* On success the port is ready to use and the line number is returned.
*/
int serial8250_register_8250_port(const struct uart_8250_port *up)
{
struct uart_8250_port *uart;
int ret = -ENOSPC;
if (up->port.uartclk == 0)
return -EINVAL;
mutex_lock(&serial_mutex);
uart = serial8250_find_match_or_unused(&up->port);
if (!uart) {
/*
* If the port is past the initial isa ports, initialize a new
* port and increment nr_uarts accordingly.
*/
uart = serial8250_setup_port(nr_uarts);
if (!uart)
goto unlock;
nr_uarts++;
}
if (uart->port.type != PORT_8250_CIR) {
struct mctrl_gpios *gpios;
if (uart->port.dev)
uart_remove_one_port(&serial8250_reg, &uart->port);
uart->port.ctrl_id = up->port.ctrl_id;
uart->port.port_id = up->port.port_id;
uart->port.iobase = up->port.iobase;
uart->port.membase = up->port.membase;
uart->port.irq = up->port.irq;
uart->port.irqflags = up->port.irqflags;
uart->port.uartclk = up->port.uartclk;
uart->port.fifosize = up->port.fifosize;
uart->port.regshift = up->port.regshift;
uart->port.iotype = up->port.iotype;
uart->port.flags = up->port.flags | UPF_BOOT_AUTOCONF;
uart->bugs = up->bugs;
uart->port.mapbase = up->port.mapbase;
uart->port.mapsize = up->port.mapsize;
uart->port.private_data = up->port.private_data;
uart->tx_loadsz = up->tx_loadsz;
uart->capabilities = up->capabilities;
uart->port.throttle = up->port.throttle;
uart->port.unthrottle = up->port.unthrottle;
uart->port.rs485_config = up->port.rs485_config;
uart->port.rs485_supported = up->port.rs485_supported;
uart->port.rs485 = up->port.rs485;
uart->rs485_start_tx = up->rs485_start_tx;
uart->rs485_stop_tx = up->rs485_stop_tx;
uart->lsr_save_mask = up->lsr_save_mask;
uart->dma = up->dma;
/* Take tx_loadsz from fifosize if it wasn't set separately */
if (uart->port.fifosize && !uart->tx_loadsz)
uart->tx_loadsz = uart->port.fifosize;
if (up->port.dev) {
uart->port.dev = up->port.dev;
ret = uart_get_rs485_mode(&uart->port);
if (ret)
goto err;
}
if (up->port.flags & UPF_FIXED_TYPE)
uart->port.type = up->port.type;
/*
* Only call mctrl_gpio_init(), if the device has no ACPI
* companion device
*/
if (!has_acpi_companion(uart->port.dev)) {
gpios = mctrl_gpio_init(&uart->port, 0);
if (IS_ERR(gpios)) {
ret = PTR_ERR(gpios);
goto err;
} else {
uart->gpios = gpios;
}
}
serial8250_set_defaults(uart);
/* Possibly override default I/O functions. */
if (up->port.serial_in)
uart->port.serial_in = up->port.serial_in;
if (up->port.serial_out)
uart->port.serial_out = up->port.serial_out;
if (up->port.handle_irq)
uart->port.handle_irq = up->port.handle_irq;
/* Possibly override set_termios call */
if (up->port.set_termios)
uart->port.set_termios = up->port.set_termios;
if (up->port.set_ldisc)
uart->port.set_ldisc = up->port.set_ldisc;
if (up->port.get_mctrl)
uart->port.get_mctrl = up->port.get_mctrl;
if (up->port.set_mctrl)
uart->port.set_mctrl = up->port.set_mctrl;
if (up->port.get_divisor)
uart->port.get_divisor = up->port.get_divisor;
if (up->port.set_divisor)
uart->port.set_divisor = up->port.set_divisor;
if (up->port.startup)
uart->port.startup = up->port.startup;
if (up->port.shutdown)
uart->port.shutdown = up->port.shutdown;
if (up->port.pm)
uart->port.pm = up->port.pm;
if (up->port.handle_break)
uart->port.handle_break = up->port.handle_break;
if (up->dl_read)
uart->dl_read = up->dl_read;
if (up->dl_write)
uart->dl_write = up->dl_write;
if (uart->port.type != PORT_8250_CIR) {
if (serial8250_isa_config != NULL)
serial8250_isa_config(0, &uart->port,
&uart->capabilities);
serial8250_apply_quirks(uart);
ret = uart_add_one_port(&serial8250_reg,
&uart->port);
if (ret)
goto err;
ret = uart->port.line;
} else {
dev_info(uart->port.dev,
"skipping CIR port at 0x%lx / 0x%llx, IRQ %d\n",
uart->port.iobase,
(unsigned long long)uart->port.mapbase,
uart->port.irq);
ret = 0;
}
if (!uart->lsr_save_mask)
uart->lsr_save_mask = LSR_SAVE_FLAGS; /* Use default LSR mask */
/* Initialise interrupt backoff work if required */
if (up->overrun_backoff_time_ms > 0) {
uart->overrun_backoff_time_ms =
up->overrun_backoff_time_ms;
INIT_DELAYED_WORK(&uart->overrun_backoff,
serial_8250_overrun_backoff_work);
} else {
uart->overrun_backoff_time_ms = 0;
}
}
unlock:
mutex_unlock(&serial_mutex);
return ret;
err:
uart->port.dev = NULL;
mutex_unlock(&serial_mutex);
return ret;
}
EXPORT_SYMBOL(serial8250_register_8250_port);
/**
* serial8250_unregister_port - remove a 16x50 serial port at runtime
* @line: serial line number
*
* Remove one serial port. This may not be called from interrupt
* context. We hand the port back to the our control.
*/
void serial8250_unregister_port(int line)
{
struct uart_8250_port *uart = &serial8250_ports[line];
mutex_lock(&serial_mutex);
if (uart->em485) {
unsigned long flags;
uart_port_lock_irqsave(&uart->port, &flags);
serial8250_em485_destroy(uart);
uart_port_unlock_irqrestore(&uart->port, flags);
}
uart_remove_one_port(&serial8250_reg, &uart->port);
if (serial8250_isa_devs) {
uart->port.flags &= ~UPF_BOOT_AUTOCONF;
uart->port.type = PORT_UNKNOWN;
uart->port.dev = &serial8250_isa_devs->dev;
uart->port.port_id = line;
uart->capabilities = 0;
serial8250_init_port(uart);
serial8250_apply_quirks(uart);
uart_add_one_port(&serial8250_reg, &uart->port);
} else {
uart->port.dev = NULL;
}
mutex_unlock(&serial_mutex);
}
EXPORT_SYMBOL(serial8250_unregister_port);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Generic 8250/16x50 serial driver");