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Diffstat (limited to 'drivers/tty/serial/mux.c')
-rw-r--r--drivers/tty/serial/mux.c94
1 files changed, 30 insertions, 64 deletions
diff --git a/drivers/tty/serial/mux.c b/drivers/tty/serial/mux.c
index 8a4be4b73723..3a77a7e5c7bc 100644
--- a/drivers/tty/serial/mux.c
+++ b/drivers/tty/serial/mux.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0+
/*
** mux.c:
** serial driver for the Mux console found in some PA-RISC servers.
@@ -5,11 +6,6 @@
** (c) Copyright 2002 Ryan Bradetich
** (c) Copyright 2002 Hewlett-Packard Company
**
-** This program is free software; you can redistribute it and/or modify
-** it under the terms of the GNU General Public License as published by
-** the Free Software Foundation; either version 2 of the License, or
-** (at your option) any later version.
-**
** This Driver currently only supports the console (port 0) on the MUX.
** Additional work will be needed on this driver to enable the full
** functionality of the MUX.
@@ -25,15 +21,11 @@
#include <linux/console.h>
#include <linux/delay.h> /* for udelay */
#include <linux/device.h>
-#include <asm/io.h>
+#include <linux/io.h>
#include <asm/irq.h>
#include <asm/parisc-device.h>
-#if defined(CONFIG_SERIAL_MUX_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
#include <linux/sysrq.h>
-#define SUPPORT_SYSRQ
-#endif
-
#include <linux/serial_core.h>
#define MUX_OFFSET 0x800
@@ -179,6 +171,13 @@ static void mux_break_ctl(struct uart_port *port, int break_state)
{
}
+static void mux_tx_done(struct uart_port *port)
+{
+ /* FIXME js: really needs to wait? */
+ while (UART_GET_FIFO_CNT(port))
+ udelay(1);
+}
+
/**
* mux_write - Write chars to the mux fifo.
* @port: Ptr to the uart_port.
@@ -188,39 +187,13 @@ static void mux_break_ctl(struct uart_port *port, int break_state)
*/
static void mux_write(struct uart_port *port)
{
- int count;
- struct circ_buf *xmit = &port->state->xmit;
-
- if(port->x_char) {
- UART_PUT_CHAR(port, port->x_char);
- port->icount.tx++;
- port->x_char = 0;
- return;
- }
+ u8 ch;
- if(uart_circ_empty(xmit) || uart_tx_stopped(port)) {
- mux_stop_tx(port);
- return;
- }
-
- count = (port->fifosize) - UART_GET_FIFO_CNT(port);
- do {
- UART_PUT_CHAR(port, xmit->buf[xmit->tail]);
- xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
- port->icount.tx++;
- if(uart_circ_empty(xmit))
- break;
-
- } while(--count > 0);
-
- while(UART_GET_FIFO_CNT(port))
- udelay(1);
-
- if(uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
- uart_write_wakeup(port);
-
- if (uart_circ_empty(xmit))
- mux_stop_tx(port);
+ uart_port_tx_limited(port, ch,
+ port->fifosize - UART_GET_FIFO_CNT(port),
+ true,
+ UART_PUT_CHAR(port, ch),
+ mux_tx_done(port));
}
/**
@@ -297,7 +270,7 @@ static void mux_shutdown(struct uart_port *port)
*/
static void
mux_set_termios(struct uart_port *port, struct ktermios *termios,
- struct ktermios *old)
+ const struct ktermios *old)
{
}
@@ -370,12 +343,12 @@ static int mux_verify_port(struct uart_port *port, struct serial_struct *ser)
}
/**
- * mux_drv_poll - Mux poll function.
+ * mux_poll - Mux poll function.
* @unused: Unused variable
*
* This function periodically polls the Serial MUX to check for new data.
*/
-static void mux_poll(unsigned long unused)
+static void mux_poll(struct timer_list *unused)
{
int i;
@@ -427,7 +400,7 @@ static struct console mux_console = {
#define MUX_CONSOLE NULL
#endif
-static struct uart_ops mux_pops = {
+static const struct uart_ops mux_pops = {
.tx_empty = mux_tx_empty,
.set_mctrl = mux_set_mctrl,
.get_mctrl = mux_get_mctrl,
@@ -478,7 +451,7 @@ static int __init mux_probe(struct parisc_device *dev)
port->iobase = 0;
port->mapbase = dev->hpa.start + MUX_OFFSET +
(i * MUX_LINE_OFFSET);
- port->membase = ioremap_nocache(port->mapbase, MUX_LINE_OFFSET);
+ port->membase = ioremap(port->mapbase, MUX_LINE_OFFSET);
port->iotype = UPIO_MEM;
port->type = PORT_MUX;
port->irq = 0;
@@ -487,13 +460,8 @@ static int __init mux_probe(struct parisc_device *dev)
port->ops = &mux_pops;
port->flags = UPF_BOOT_AUTOCONF;
port->line = port_cnt;
+ port->has_sysrq = IS_ENABLED(CONFIG_SERIAL_MUX_CONSOLE);
- /* The port->timeout needs to match what is present in
- * uart_wait_until_sent in serial_core.c. Otherwise
- * the time spent in msleep_interruptable will be very
- * long, causing the appearance of a console hang.
- */
- port->timeout = HZ / 50;
spin_lock_init(&port->lock);
status = uart_add_one_port(&mux_driver, port);
@@ -503,7 +471,7 @@ static int __init mux_probe(struct parisc_device *dev)
return 0;
}
-static int mux_remove(struct parisc_device *dev)
+static void __exit mux_remove(struct parisc_device *dev)
{
int i, j;
int port_count = (long)dev_get_drvdata(&dev->dev);
@@ -525,7 +493,6 @@ static int mux_remove(struct parisc_device *dev)
}
release_mem_region(dev->hpa.start + MUX_OFFSET, port_count * MUX_LINE_OFFSET);
- return 0;
}
/* Hack. This idea was taken from the 8250_gsc.c on how to properly order
@@ -536,13 +503,13 @@ static int mux_remove(struct parisc_device *dev)
* This table only contains the parisc_device_id of known builtin mux
* devices. All other mux cards will be detected by the generic mux_tbl.
*/
-static struct parisc_device_id builtin_mux_tbl[] = {
+static const struct parisc_device_id builtin_mux_tbl[] __initconst = {
{ HPHW_A_DIRECT, HVERSION_REV_ANY_ID, 0x15, 0x0000D }, /* All K-class */
{ HPHW_A_DIRECT, HVERSION_REV_ANY_ID, 0x44, 0x0000D }, /* E35, E45, and E55 */
{ 0, }
};
-static struct parisc_device_id mux_tbl[] = {
+static const struct parisc_device_id mux_tbl[] __initconst = {
{ HPHW_A_DIRECT, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0000D },
{ 0, }
};
@@ -550,18 +517,18 @@ static struct parisc_device_id mux_tbl[] = {
MODULE_DEVICE_TABLE(parisc, builtin_mux_tbl);
MODULE_DEVICE_TABLE(parisc, mux_tbl);
-static struct parisc_driver builtin_serial_mux_driver = {
+static struct parisc_driver builtin_serial_mux_driver __refdata = {
.name = "builtin_serial_mux",
.id_table = builtin_mux_tbl,
.probe = mux_probe,
- .remove = mux_remove,
+ .remove = __exit_p(mux_remove),
};
-static struct parisc_driver serial_mux_driver = {
+static struct parisc_driver serial_mux_driver __refdata = {
.name = "serial_mux",
.id_table = mux_tbl,
.probe = mux_probe,
- .remove = mux_remove,
+ .remove = __exit_p(mux_remove),
};
/**
@@ -576,8 +543,7 @@ static int __init mux_init(void)
if(port_cnt > 0) {
/* Start the Mux timer */
- init_timer(&mux_timer);
- mux_timer.function = mux_poll;
+ timer_setup(&mux_timer, mux_poll, 0);
mod_timer(&mux_timer, jiffies + MUX_POLL_DELAY);
#ifdef CONFIG_SERIAL_MUX_CONSOLE
@@ -597,7 +563,7 @@ static void __exit mux_exit(void)
{
/* Delete the Mux timer. */
if(port_cnt > 0) {
- del_timer_sync(&mux_timer);
+ timer_delete_sync(&mux_timer);
#ifdef CONFIG_SERIAL_MUX_CONSOLE
unregister_console(&mux_console);
#endif
generated by cgit (git 2.34.1) at 2025-12-25 00:47:33 +0000