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![Jiri Slaby](/assets/img/avatar_default.png)
After the previous patch, we can make port passed to serial8250_find_match_or_unused const. And then we can make const also port of serial8250_register_8250_port. Signed-off-by: Jiri Slaby <jslaby@suse.cz> Link: https://lore.kernel.org/r/20210519072153.3859-2-jslaby@suse.cz Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1287 lines
33 KiB
C
1287 lines
33 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Universal/legacy driver for 8250/16550-type serial ports
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*
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* Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
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*
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* Copyright (C) 2001 Russell King.
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*
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* Supports: ISA-compatible 8250/16550 ports
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* PNP 8250/16550 ports
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* early_serial_setup() ports
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* userspace-configurable "phantom" ports
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* "serial8250" platform devices
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* serial8250_register_8250_port() ports
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*/
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#include <linux/acpi.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/ioport.h>
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#include <linux/init.h>
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#include <linux/console.h>
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#include <linux/sysrq.h>
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#include <linux/delay.h>
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#include <linux/platform_device.h>
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#include <linux/tty.h>
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#include <linux/ratelimit.h>
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#include <linux/tty_flip.h>
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#include <linux/serial.h>
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#include <linux/serial_8250.h>
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#include <linux/nmi.h>
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#include <linux/mutex.h>
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#include <linux/slab.h>
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#include <linux/uaccess.h>
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#include <linux/pm_runtime.h>
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#include <linux/io.h>
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#ifdef CONFIG_SPARC
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#include <linux/sunserialcore.h>
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#endif
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#include <asm/irq.h>
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#include "8250.h"
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/*
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* Configuration:
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* share_irqs - whether we pass IRQF_SHARED to request_irq(). This option
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* is unsafe when used on edge-triggered interrupts.
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*/
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static unsigned int share_irqs = SERIAL8250_SHARE_IRQS;
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static unsigned int nr_uarts = CONFIG_SERIAL_8250_RUNTIME_UARTS;
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static struct uart_driver serial8250_reg;
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static unsigned int skip_txen_test; /* force skip of txen test at init time */
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#define PASS_LIMIT 512
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#include <asm/serial.h>
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/*
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* SERIAL_PORT_DFNS tells us about built-in ports that have no
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* standard enumeration mechanism. Platforms that can find all
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* serial ports via mechanisms like ACPI or PCI need not supply it.
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*/
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#ifndef SERIAL_PORT_DFNS
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#define SERIAL_PORT_DFNS
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#endif
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static const struct old_serial_port old_serial_port[] = {
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SERIAL_PORT_DFNS /* defined in asm/serial.h */
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};
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#define UART_NR CONFIG_SERIAL_8250_NR_UARTS
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#ifdef CONFIG_SERIAL_8250_RSA
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#define PORT_RSA_MAX 4
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static unsigned long probe_rsa[PORT_RSA_MAX];
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static unsigned int probe_rsa_count;
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#endif /* CONFIG_SERIAL_8250_RSA */
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struct irq_info {
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struct hlist_node node;
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int irq;
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spinlock_t lock; /* Protects list not the hash */
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struct list_head *head;
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};
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#define NR_IRQ_HASH 32 /* Can be adjusted later */
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static struct hlist_head irq_lists[NR_IRQ_HASH];
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static DEFINE_MUTEX(hash_mutex); /* Used to walk the hash */
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/*
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* This is the serial driver's interrupt routine.
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*
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* Arjan thinks the old way was overly complex, so it got simplified.
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* Alan disagrees, saying that need the complexity to handle the weird
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* nature of ISA shared interrupts. (This is a special exception.)
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*
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* In order to handle ISA shared interrupts properly, we need to check
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* that all ports have been serviced, and therefore the ISA interrupt
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* line has been de-asserted.
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*
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* This means we need to loop through all ports. checking that they
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* don't have an interrupt pending.
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*/
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static irqreturn_t serial8250_interrupt(int irq, void *dev_id)
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{
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struct irq_info *i = dev_id;
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struct list_head *l, *end = NULL;
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int pass_counter = 0, handled = 0;
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pr_debug("%s(%d): start\n", __func__, irq);
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spin_lock(&i->lock);
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l = i->head;
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do {
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struct uart_8250_port *up;
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struct uart_port *port;
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up = list_entry(l, struct uart_8250_port, list);
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port = &up->port;
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if (port->handle_irq(port)) {
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handled = 1;
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end = NULL;
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} else if (end == NULL)
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end = l;
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l = l->next;
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if (l == i->head && pass_counter++ > PASS_LIMIT)
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break;
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} while (l != end);
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spin_unlock(&i->lock);
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pr_debug("%s(%d): end\n", __func__, irq);
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return IRQ_RETVAL(handled);
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}
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/*
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* To support ISA shared interrupts, we need to have one interrupt
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* handler that ensures that the IRQ line has been deasserted
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* before returning. Failing to do this will result in the IRQ
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* line being stuck active, and, since ISA irqs are edge triggered,
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* no more IRQs will be seen.
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*/
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static void serial_do_unlink(struct irq_info *i, struct uart_8250_port *up)
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{
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spin_lock_irq(&i->lock);
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if (!list_empty(i->head)) {
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if (i->head == &up->list)
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i->head = i->head->next;
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list_del(&up->list);
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} else {
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BUG_ON(i->head != &up->list);
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i->head = NULL;
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}
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spin_unlock_irq(&i->lock);
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/* List empty so throw away the hash node */
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if (i->head == NULL) {
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hlist_del(&i->node);
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kfree(i);
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}
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}
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static int serial_link_irq_chain(struct uart_8250_port *up)
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{
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struct hlist_head *h;
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struct irq_info *i;
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int ret;
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mutex_lock(&hash_mutex);
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h = &irq_lists[up->port.irq % NR_IRQ_HASH];
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hlist_for_each_entry(i, h, node)
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if (i->irq == up->port.irq)
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break;
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if (i == NULL) {
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i = kzalloc(sizeof(struct irq_info), GFP_KERNEL);
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if (i == NULL) {
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mutex_unlock(&hash_mutex);
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return -ENOMEM;
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}
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spin_lock_init(&i->lock);
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i->irq = up->port.irq;
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hlist_add_head(&i->node, h);
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}
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mutex_unlock(&hash_mutex);
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spin_lock_irq(&i->lock);
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if (i->head) {
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list_add(&up->list, i->head);
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spin_unlock_irq(&i->lock);
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ret = 0;
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} else {
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INIT_LIST_HEAD(&up->list);
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i->head = &up->list;
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spin_unlock_irq(&i->lock);
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ret = request_irq(up->port.irq, serial8250_interrupt,
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up->port.irqflags, up->port.name, i);
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if (ret < 0)
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serial_do_unlink(i, up);
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}
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return ret;
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}
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static void serial_unlink_irq_chain(struct uart_8250_port *up)
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{
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struct irq_info *i;
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struct hlist_head *h;
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mutex_lock(&hash_mutex);
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h = &irq_lists[up->port.irq % NR_IRQ_HASH];
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hlist_for_each_entry(i, h, node)
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if (i->irq == up->port.irq)
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break;
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BUG_ON(i == NULL);
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BUG_ON(i->head == NULL);
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if (list_empty(i->head))
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free_irq(up->port.irq, i);
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serial_do_unlink(i, up);
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mutex_unlock(&hash_mutex);
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}
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/*
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* This function is used to handle ports that do not have an
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* interrupt. This doesn't work very well for 16450's, but gives
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* barely passable results for a 16550A. (Although at the expense
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* of much CPU overhead).
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*/
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static void serial8250_timeout(struct timer_list *t)
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{
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struct uart_8250_port *up = from_timer(up, t, timer);
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up->port.handle_irq(&up->port);
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mod_timer(&up->timer, jiffies + uart_poll_timeout(&up->port));
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}
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static void serial8250_backup_timeout(struct timer_list *t)
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{
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struct uart_8250_port *up = from_timer(up, t, timer);
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unsigned int iir, ier = 0, lsr;
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unsigned long flags;
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spin_lock_irqsave(&up->port.lock, flags);
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/*
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* Must disable interrupts or else we risk racing with the interrupt
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* based handler.
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*/
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if (up->port.irq) {
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ier = serial_in(up, UART_IER);
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serial_out(up, UART_IER, 0);
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}
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iir = serial_in(up, UART_IIR);
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/*
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* This should be a safe test for anyone who doesn't trust the
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* IIR bits on their UART, but it's specifically designed for
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* the "Diva" UART used on the management processor on many HP
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* ia64 and parisc boxes.
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*/
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lsr = serial_in(up, UART_LSR);
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up->lsr_saved_flags |= lsr & LSR_SAVE_FLAGS;
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if ((iir & UART_IIR_NO_INT) && (up->ier & UART_IER_THRI) &&
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(!uart_circ_empty(&up->port.state->xmit) || up->port.x_char) &&
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(lsr & UART_LSR_THRE)) {
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iir &= ~(UART_IIR_ID | UART_IIR_NO_INT);
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iir |= UART_IIR_THRI;
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}
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if (!(iir & UART_IIR_NO_INT))
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serial8250_tx_chars(up);
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if (up->port.irq)
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serial_out(up, UART_IER, ier);
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spin_unlock_irqrestore(&up->port.lock, flags);
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/* Standard timer interval plus 0.2s to keep the port running */
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mod_timer(&up->timer,
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jiffies + uart_poll_timeout(&up->port) + HZ / 5);
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}
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static int univ8250_setup_irq(struct uart_8250_port *up)
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{
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struct uart_port *port = &up->port;
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int retval = 0;
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/*
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* The above check will only give an accurate result the first time
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* the port is opened so this value needs to be preserved.
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*/
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if (up->bugs & UART_BUG_THRE) {
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pr_debug("%s - using backup timer\n", port->name);
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up->timer.function = serial8250_backup_timeout;
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mod_timer(&up->timer, jiffies +
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uart_poll_timeout(port) + HZ / 5);
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}
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/*
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* If the "interrupt" for this port doesn't correspond with any
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* hardware interrupt, we use a timer-based system. The original
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* driver used to do this with IRQ0.
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*/
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if (!port->irq)
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mod_timer(&up->timer, jiffies + uart_poll_timeout(port));
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else
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retval = serial_link_irq_chain(up);
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return retval;
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}
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static void univ8250_release_irq(struct uart_8250_port *up)
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{
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struct uart_port *port = &up->port;
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del_timer_sync(&up->timer);
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up->timer.function = serial8250_timeout;
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if (port->irq)
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serial_unlink_irq_chain(up);
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}
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#ifdef CONFIG_SERIAL_8250_RSA
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static int serial8250_request_rsa_resource(struct uart_8250_port *up)
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{
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unsigned long start = UART_RSA_BASE << up->port.regshift;
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unsigned int size = 8 << up->port.regshift;
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struct uart_port *port = &up->port;
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int ret = -EINVAL;
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switch (port->iotype) {
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case UPIO_HUB6:
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case UPIO_PORT:
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start += port->iobase;
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if (request_region(start, size, "serial-rsa"))
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ret = 0;
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else
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ret = -EBUSY;
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break;
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}
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return ret;
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}
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static void serial8250_release_rsa_resource(struct uart_8250_port *up)
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{
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unsigned long offset = UART_RSA_BASE << up->port.regshift;
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unsigned int size = 8 << up->port.regshift;
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struct uart_port *port = &up->port;
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switch (port->iotype) {
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case UPIO_HUB6:
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case UPIO_PORT:
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release_region(port->iobase + offset, size);
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break;
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}
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}
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#endif
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static const struct uart_ops *base_ops;
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static struct uart_ops univ8250_port_ops;
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static const struct uart_8250_ops univ8250_driver_ops = {
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.setup_irq = univ8250_setup_irq,
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.release_irq = univ8250_release_irq,
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};
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static struct uart_8250_port serial8250_ports[UART_NR];
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/**
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* serial8250_get_port - retrieve struct uart_8250_port
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* @line: serial line number
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*
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* This function retrieves struct uart_8250_port for the specific line.
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* This struct *must* *not* be used to perform a 8250 or serial core operation
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* which is not accessible otherwise. Its only purpose is to make the struct
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* accessible to the runtime-pm callbacks for context suspend/restore.
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* The lock assumption made here is none because runtime-pm suspend/resume
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* callbacks should not be invoked if there is any operation performed on the
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* port.
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*/
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struct uart_8250_port *serial8250_get_port(int line)
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{
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return &serial8250_ports[line];
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}
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EXPORT_SYMBOL_GPL(serial8250_get_port);
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static void (*serial8250_isa_config)(int port, struct uart_port *up,
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u32 *capabilities);
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void serial8250_set_isa_configurator(
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void (*v)(int port, struct uart_port *up, u32 *capabilities))
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{
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serial8250_isa_config = v;
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}
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EXPORT_SYMBOL(serial8250_set_isa_configurator);
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#ifdef CONFIG_SERIAL_8250_RSA
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static void univ8250_config_port(struct uart_port *port, int flags)
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{
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struct uart_8250_port *up = up_to_u8250p(port);
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up->probe &= ~UART_PROBE_RSA;
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if (port->type == PORT_RSA) {
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if (serial8250_request_rsa_resource(up) == 0)
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up->probe |= UART_PROBE_RSA;
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} else if (flags & UART_CONFIG_TYPE) {
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int i;
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for (i = 0; i < probe_rsa_count; i++) {
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if (probe_rsa[i] == up->port.iobase) {
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if (serial8250_request_rsa_resource(up) == 0)
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up->probe |= UART_PROBE_RSA;
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break;
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}
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}
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}
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base_ops->config_port(port, flags);
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if (port->type != PORT_RSA && up->probe & UART_PROBE_RSA)
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serial8250_release_rsa_resource(up);
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}
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static int univ8250_request_port(struct uart_port *port)
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{
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struct uart_8250_port *up = up_to_u8250p(port);
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int ret;
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ret = base_ops->request_port(port);
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if (ret == 0 && port->type == PORT_RSA) {
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ret = serial8250_request_rsa_resource(up);
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if (ret < 0)
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base_ops->release_port(port);
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}
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return ret;
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}
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static void univ8250_release_port(struct uart_port *port)
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{
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struct uart_8250_port *up = up_to_u8250p(port);
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if (port->type == PORT_RSA)
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serial8250_release_rsa_resource(up);
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base_ops->release_port(port);
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}
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static void univ8250_rsa_support(struct uart_ops *ops)
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{
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ops->config_port = univ8250_config_port;
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ops->request_port = univ8250_request_port;
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ops->release_port = univ8250_release_port;
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}
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#else
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#define univ8250_rsa_support(x) do { } while (0)
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#endif /* CONFIG_SERIAL_8250_RSA */
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static inline void serial8250_apply_quirks(struct uart_8250_port *up)
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{
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up->port.quirks |= skip_txen_test ? UPQ_NO_TXEN_TEST : 0;
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}
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static void __init serial8250_isa_init_ports(void)
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{
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struct uart_8250_port *up;
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static int first = 1;
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int i, irqflag = 0;
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if (!first)
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return;
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first = 0;
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if (nr_uarts > UART_NR)
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nr_uarts = UART_NR;
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for (i = 0; i < nr_uarts; i++) {
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struct uart_8250_port *up = &serial8250_ports[i];
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struct uart_port *port = &up->port;
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port->line = i;
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serial8250_init_port(up);
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if (!base_ops)
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base_ops = port->ops;
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port->ops = &univ8250_port_ops;
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timer_setup(&up->timer, serial8250_timeout, 0);
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|
|
up->ops = &univ8250_driver_ops;
|
|
|
|
/*
|
|
* ALPHA_KLUDGE_MCR needs to be killed.
|
|
*/
|
|
up->mcr_mask = ~ALPHA_KLUDGE_MCR;
|
|
up->mcr_force = ALPHA_KLUDGE_MCR;
|
|
serial8250_set_defaults(up);
|
|
}
|
|
|
|
/* chain base port ops to support Remote Supervisor Adapter */
|
|
univ8250_port_ops = *base_ops;
|
|
univ8250_rsa_support(&univ8250_port_ops);
|
|
|
|
if (share_irqs)
|
|
irqflag = IRQF_SHARED;
|
|
|
|
for (i = 0, up = serial8250_ports;
|
|
i < ARRAY_SIZE(old_serial_port) && i < nr_uarts;
|
|
i++, up++) {
|
|
struct uart_port *port = &up->port;
|
|
|
|
port->iobase = old_serial_port[i].port;
|
|
port->irq = irq_canonicalize(old_serial_port[i].irq);
|
|
port->irqflags = 0;
|
|
port->uartclk = old_serial_port[i].baud_base * 16;
|
|
port->flags = old_serial_port[i].flags;
|
|
port->hub6 = 0;
|
|
port->membase = old_serial_port[i].iomem_base;
|
|
port->iotype = old_serial_port[i].io_type;
|
|
port->regshift = old_serial_port[i].iomem_reg_shift;
|
|
|
|
port->irqflags |= irqflag;
|
|
if (serial8250_isa_config != NULL)
|
|
serial8250_isa_config(i, &up->port, &up->capabilities);
|
|
}
|
|
}
|
|
|
|
static 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;
|
|
|
|
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_port *port;
|
|
int retval;
|
|
|
|
/*
|
|
* 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 >= nr_uarts)
|
|
co->index = 0;
|
|
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
|
|
|
|
static 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);
|
|
|
|
/*
|
|
* Register a set of serial devices attached to a platform device. The
|
|
* list is terminated with a zero flags entry, which means we expect
|
|
* all entries to have at least UPF_BOOT_AUTOCONF set.
|
|
*/
|
|
static int serial8250_probe(struct platform_device *dev)
|
|
{
|
|
struct plat_serial8250_port *p = dev_get_platdata(&dev->dev);
|
|
struct uart_8250_port uart;
|
|
int ret, i, irqflag = 0;
|
|
|
|
memset(&uart, 0, sizeof(uart));
|
|
|
|
if (share_irqs)
|
|
irqflag = IRQF_SHARED;
|
|
|
|
for (i = 0; p && p->flags != 0; p++, i++) {
|
|
uart.port.iobase = p->iobase;
|
|
uart.port.membase = p->membase;
|
|
uart.port.irq = p->irq;
|
|
uart.port.irqflags = p->irqflags;
|
|
uart.port.uartclk = p->uartclk;
|
|
uart.port.regshift = p->regshift;
|
|
uart.port.iotype = p->iotype;
|
|
uart.port.flags = p->flags;
|
|
uart.port.mapbase = p->mapbase;
|
|
uart.port.hub6 = p->hub6;
|
|
uart.port.has_sysrq = p->has_sysrq;
|
|
uart.port.private_data = p->private_data;
|
|
uart.port.type = p->type;
|
|
uart.port.serial_in = p->serial_in;
|
|
uart.port.serial_out = p->serial_out;
|
|
uart.port.handle_irq = p->handle_irq;
|
|
uart.port.handle_break = p->handle_break;
|
|
uart.port.set_termios = p->set_termios;
|
|
uart.port.set_ldisc = p->set_ldisc;
|
|
uart.port.get_mctrl = p->get_mctrl;
|
|
uart.port.pm = p->pm;
|
|
uart.port.dev = &dev->dev;
|
|
uart.port.irqflags |= irqflag;
|
|
ret = serial8250_register_8250_port(&uart);
|
|
if (ret < 0) {
|
|
dev_err(&dev->dev, "unable to register port at index %d "
|
|
"(IO%lx MEM%llx IRQ%d): %d\n", i,
|
|
p->iobase, (unsigned long long)p->mapbase,
|
|
p->irq, ret);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Remove serial ports registered against a platform device.
|
|
*/
|
|
static int serial8250_remove(struct platform_device *dev)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < nr_uarts; i++) {
|
|
struct uart_8250_port *up = &serial8250_ports[i];
|
|
|
|
if (up->port.dev == &dev->dev)
|
|
serial8250_unregister_port(i);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int serial8250_suspend(struct platform_device *dev, pm_message_t state)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < UART_NR; i++) {
|
|
struct uart_8250_port *up = &serial8250_ports[i];
|
|
|
|
if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev)
|
|
uart_suspend_port(&serial8250_reg, &up->port);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int serial8250_resume(struct platform_device *dev)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < UART_NR; i++) {
|
|
struct uart_8250_port *up = &serial8250_ports[i];
|
|
|
|
if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev)
|
|
serial8250_resume_port(i);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver serial8250_isa_driver = {
|
|
.probe = serial8250_probe,
|
|
.remove = serial8250_remove,
|
|
.suspend = serial8250_suspend,
|
|
.resume = serial8250_resume,
|
|
.driver = {
|
|
.name = "serial8250",
|
|
},
|
|
};
|
|
|
|
/*
|
|
* This "device" covers _all_ ISA 8250-compatible serial devices listed
|
|
* in the table in include/asm/serial.h
|
|
*/
|
|
static struct platform_device *serial8250_isa_devs;
|
|
|
|
/*
|
|
* 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;
|
|
|
|
spin_lock_irqsave(&port->lock, flags);
|
|
up->ier |= UART_IER_RLSI | UART_IER_RDI;
|
|
up->port.read_status_mask |= UART_LSR_DR;
|
|
serial_out(up, UART_IER, up->ier);
|
|
spin_unlock_irqrestore(&port->lock, 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 && uart->port.type != PORT_8250_CIR) {
|
|
struct mctrl_gpios *gpios;
|
|
|
|
if (uart->port.dev)
|
|
uart_remove_one_port(&serial8250_reg, &uart->port);
|
|
|
|
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 = up->port.rs485;
|
|
uart->rs485_start_tx = up->rs485_start_tx;
|
|
uart->rs485_stop_tx = up->rs485_stop_tx;
|
|
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;
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
}
|
|
|
|
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;
|
|
|
|
spin_lock_irqsave(&uart->port.lock, flags);
|
|
serial8250_em485_destroy(uart);
|
|
spin_unlock_irqrestore(&uart->port.lock, 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->capabilities = 0;
|
|
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);
|
|
|
|
static int __init serial8250_init(void)
|
|
{
|
|
int ret;
|
|
|
|
if (nr_uarts == 0)
|
|
return -ENODEV;
|
|
|
|
serial8250_isa_init_ports();
|
|
|
|
pr_info("Serial: 8250/16550 driver, %d ports, IRQ sharing %sabled\n",
|
|
nr_uarts, share_irqs ? "en" : "dis");
|
|
|
|
#ifdef CONFIG_SPARC
|
|
ret = sunserial_register_minors(&serial8250_reg, UART_NR);
|
|
#else
|
|
serial8250_reg.nr = UART_NR;
|
|
ret = uart_register_driver(&serial8250_reg);
|
|
#endif
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = serial8250_pnp_init();
|
|
if (ret)
|
|
goto unreg_uart_drv;
|
|
|
|
serial8250_isa_devs = platform_device_alloc("serial8250",
|
|
PLAT8250_DEV_LEGACY);
|
|
if (!serial8250_isa_devs) {
|
|
ret = -ENOMEM;
|
|
goto unreg_pnp;
|
|
}
|
|
|
|
ret = platform_device_add(serial8250_isa_devs);
|
|
if (ret)
|
|
goto put_dev;
|
|
|
|
serial8250_register_ports(&serial8250_reg, &serial8250_isa_devs->dev);
|
|
|
|
ret = platform_driver_register(&serial8250_isa_driver);
|
|
if (ret == 0)
|
|
goto out;
|
|
|
|
platform_device_del(serial8250_isa_devs);
|
|
put_dev:
|
|
platform_device_put(serial8250_isa_devs);
|
|
unreg_pnp:
|
|
serial8250_pnp_exit();
|
|
unreg_uart_drv:
|
|
#ifdef CONFIG_SPARC
|
|
sunserial_unregister_minors(&serial8250_reg, UART_NR);
|
|
#else
|
|
uart_unregister_driver(&serial8250_reg);
|
|
#endif
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static void __exit serial8250_exit(void)
|
|
{
|
|
struct platform_device *isa_dev = serial8250_isa_devs;
|
|
|
|
/*
|
|
* This tells serial8250_unregister_port() not to re-register
|
|
* the ports (thereby making serial8250_isa_driver permanently
|
|
* in use.)
|
|
*/
|
|
serial8250_isa_devs = NULL;
|
|
|
|
platform_driver_unregister(&serial8250_isa_driver);
|
|
platform_device_unregister(isa_dev);
|
|
|
|
serial8250_pnp_exit();
|
|
|
|
#ifdef CONFIG_SPARC
|
|
sunserial_unregister_minors(&serial8250_reg, UART_NR);
|
|
#else
|
|
uart_unregister_driver(&serial8250_reg);
|
|
#endif
|
|
}
|
|
|
|
module_init(serial8250_init);
|
|
module_exit(serial8250_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("Generic 8250/16x50 serial driver");
|
|
|
|
module_param_hw(share_irqs, uint, other, 0644);
|
|
MODULE_PARM_DESC(share_irqs, "Share IRQs with other non-8250/16x50 devices (unsafe)");
|
|
|
|
module_param(nr_uarts, uint, 0644);
|
|
MODULE_PARM_DESC(nr_uarts, "Maximum number of UARTs supported. (1-" __MODULE_STRING(CONFIG_SERIAL_8250_NR_UARTS) ")");
|
|
|
|
module_param(skip_txen_test, uint, 0644);
|
|
MODULE_PARM_DESC(skip_txen_test, "Skip checking for the TXEN bug at init time");
|
|
|
|
#ifdef CONFIG_SERIAL_8250_RSA
|
|
module_param_hw_array(probe_rsa, ulong, ioport, &probe_rsa_count, 0444);
|
|
MODULE_PARM_DESC(probe_rsa, "Probe I/O ports for RSA");
|
|
#endif
|
|
MODULE_ALIAS_CHARDEV_MAJOR(TTY_MAJOR);
|
|
|
|
#ifdef CONFIG_SERIAL_8250_DEPRECATED_OPTIONS
|
|
#ifndef MODULE
|
|
/* This module was renamed to 8250_core in 3.7. Keep the old "8250" name
|
|
* working as well for the module options so we don't break people. We
|
|
* need to keep the names identical and the convenient macros will happily
|
|
* refuse to let us do that by failing the build with redefinition errors
|
|
* of global variables. So we stick them inside a dummy function to avoid
|
|
* those conflicts. The options still get parsed, and the redefined
|
|
* MODULE_PARAM_PREFIX lets us keep the "8250." syntax alive.
|
|
*
|
|
* This is hacky. I'm sorry.
|
|
*/
|
|
static void __used s8250_options(void)
|
|
{
|
|
#undef MODULE_PARAM_PREFIX
|
|
#define MODULE_PARAM_PREFIX "8250_core."
|
|
|
|
module_param_cb(share_irqs, ¶m_ops_uint, &share_irqs, 0644);
|
|
module_param_cb(nr_uarts, ¶m_ops_uint, &nr_uarts, 0644);
|
|
module_param_cb(skip_txen_test, ¶m_ops_uint, &skip_txen_test, 0644);
|
|
#ifdef CONFIG_SERIAL_8250_RSA
|
|
__module_param_call(MODULE_PARAM_PREFIX, probe_rsa,
|
|
¶m_array_ops, .arr = &__param_arr_probe_rsa,
|
|
0444, -1, 0);
|
|
#endif
|
|
}
|
|
#else
|
|
MODULE_ALIAS("8250_core");
|
|
#endif
|
|
#endif
|