Commit 56b85f32 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'tty-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty-2.6

* 'tty-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty-2.6: (36 commits)
  serial: apbuart: Fixup apbuart_console_init()
  TTY: Add tty ioctl to figure device node of the system console.
  tty: add 'active' sysfs attribute to tty0 and console device
  drivers: serial: apbuart: Handle OF failures gracefully
  Serial: Avoid unbalanced IRQ wake disable during resume
  tty: fix typos/errors in tty_driver.h comments
  pch_uart : fix warnings for 64bit compile
  8250: fix uninitialized FIFOs
  ip2: fix compiler warning on ip2main_pci_tbl
  specialix: fix compiler warning on specialix_pci_tbl
  rocket: fix compiler warning on rocket_pci_ids
  8250: add a UPIO_DWAPB32 for 32 bit accesses
  8250: use container_of() instead of casting
  serial: omap-serial: Add support for kernel debugger
  serial: fix pch_uart kconfig & build
  drivers: char: hvc: add arm JTAG DCC console support
  RS485 documentation: add 16C950 UART description
  serial: ifx6x60: fix memory leak
  serial: ifx6x60: free IRQ on error
  Serial: EG20T: add PCH_UART driver
  ...

Fixed up conflicts in drivers/serial/apbuart.c with evil merge that
makes the code look fairly sane (unlike either side).
parents 3e5b08cb 568389c2
What: /sys/class/tty/console/active
Date: Nov 2010
Contact: Kay Sievers <kay.sievers@vrfy.org>
Description:
Shows the list of currently configured
console devices, like 'tty1 ttyS0'.
The last entry in the file is the active
device connected to /dev/console.
The file supports poll() to detect virtual
console switches.
What: /sys/class/tty/tty0/active
Date: Nov 2010
Contact: Kay Sievers <kay.sievers@vrfy.org>
Description:
Shows the currently active virtual console
device, like 'tty1'.
The file supports poll() to detect virtual
console switches.
......@@ -1181,6 +1181,30 @@ Table 1-12: Files in /proc/fs/ext4/<devname>
mb_groups details of multiblock allocator buddy cache of free blocks
..............................................................................
2.0 /proc/consoles
------------------
Shows registered system console lines.
To see which character device lines are currently used for the system console
/dev/console, you may simply look into the file /proc/consoles:
> cat /proc/consoles
tty0 -WU (ECp) 4:7
ttyS0 -W- (Ep) 4:64
The columns are:
device name of the device
operations R = can do read operations
W = can do write operations
U = can do unblank
flags E = it is enabled
C = it is prefered console
B = it is primary boot console
p = it is used for printk buffer
b = it is not a TTY but a Braille device
a = it is safe to use when cpu is offline
major:minor major and minor number of the device separated by a colon
------------------------------------------------------------------------------
Summary
......
......@@ -14,6 +14,8 @@ riscom8.txt
- notes on using the RISCom/8 multi-port serial driver.
rocket.txt
- info on the Comtrol RocketPort multiport serial driver.
serial-rs485.txt
- info about RS485 structures and support in the kernel.
specialix.txt
- info on hardware/driver for specialix IO8+ multiport serial card.
stallion.txt
......
RS485 SERIAL COMMUNICATIONS
1. INTRODUCTION
EIA-485, also known as TIA/EIA-485 or RS-485, is a standard defining the
electrical characteristics of drivers and receivers for use in balanced
digital multipoint systems.
This standard is widely used for communications in industrial automation
because it can be used effectively over long distances and in electrically
noisy environments.
2. HARDWARE-RELATED CONSIDERATIONS
Some CPUs/UARTs (e.g., Atmel AT91 or 16C950 UART) contain a built-in
half-duplex mode capable of automatically controlling line direction by
toggling RTS or DTR signals. That can be used to control external
half-duplex hardware like an RS485 transceiver or any RS232-connected
half-duplex devices like some modems.
For these microcontrollers, the Linux driver should be made capable of
working in both modes, and proper ioctls (see later) should be made
available at user-level to allow switching from one mode to the other, and
vice versa.
3. DATA STRUCTURES ALREADY AVAILABLE IN THE KERNEL
The Linux kernel provides the serial_rs485 structure (see [1]) to handle
RS485 communications. This data structure is used to set and configure RS485
parameters in the platform data and in ioctls.
Any driver for devices capable of working both as RS232 and RS485 should
provide at least the following ioctls:
- TIOCSRS485 (typically associated with number 0x542F). This ioctl is used
to enable/disable RS485 mode from user-space
- TIOCGRS485 (typically associated with number 0x542E). This ioctl is used
to get RS485 mode from kernel-space (i.e., driver) to user-space.
In other words, the serial driver should contain a code similar to the next
one:
static struct uart_ops atmel_pops = {
/* ... */
.ioctl = handle_ioctl,
};
static int handle_ioctl(struct uart_port *port,
unsigned int cmd,
unsigned long arg)
{
struct serial_rs485 rs485conf;
switch (cmd) {
case TIOCSRS485:
if (copy_from_user(&rs485conf,
(struct serial_rs485 *) arg,
sizeof(rs485conf)))
return -EFAULT;
/* ... */
break;
case TIOCGRS485:
if (copy_to_user((struct serial_rs485 *) arg,
...,
sizeof(rs485conf)))
return -EFAULT;
/* ... */
break;
/* ... */
}
}
4. USAGE FROM USER-LEVEL
From user-level, RS485 configuration can be get/set using the previous
ioctls. For instance, to set RS485 you can use the following code:
#include <linux/serial.h>
/* Driver-specific ioctls: */
#define TIOCGRS485 0x542E
#define TIOCSRS485 0x542F
/* Open your specific device (e.g., /dev/mydevice): */
int fd = open ("/dev/mydevice", O_RDWR);
if (fd < 0) {
/* Error handling. See errno. */
}
struct serial_rs485 rs485conf;
/* Set RS485 mode: */
rs485conf.flags |= SER_RS485_ENABLED;
/* Set rts delay before send, if needed: */
rs485conf.flags |= SER_RS485_RTS_BEFORE_SEND;
rs485conf.delay_rts_before_send = ...;
/* Set rts delay after send, if needed: */
rs485conf.flags |= SER_RS485_RTS_AFTER_SEND;
rs485conf.delay_rts_after_send = ...;
if (ioctl (fd, TIOCSRS485, &rs485conf) < 0) {
/* Error handling. See errno. */
}
/* Use read() and write() syscalls here... */
/* Close the device when finished: */
if (close (fd) < 0) {
/* Error handling. See errno. */
}
5. REFERENCES
[1] include/linux/serial.h
......@@ -92,6 +92,7 @@
#define TIOCGSID 0x5429 /* Return the session ID of FD */
#define TIOCGPTN _IOR('T',0x30, unsigned int) /* Get Pty Number (of pty-mux device) */
#define TIOCSPTLCK _IOW('T',0x31, int) /* Lock/unlock Pty */
#define TIOCGDEV _IOR('T',0x32, unsigned int) /* Get primary device node of /dev/console */
#define TIOCSIG _IOW('T',0x36, int) /* Generate signal on Pty slave */
#define TIOCSERCONFIG 0x5453
......
......@@ -83,6 +83,7 @@
#define TCSETSF2 _IOW('T', 0x2D, struct termios2)
#define TIOCGPTN _IOR('T', 0x30, unsigned int) /* Get Pty Number (of pty-mux device) */
#define TIOCSPTLCK _IOW('T', 0x31, int) /* Lock/unlock Pty */
#define TIOCGDEV _IOR('T', 0x32, unsigned int) /* Get primary device node of /dev/console */
#define TIOCSIG _IOW('T', 0x36, int) /* Generate signal on Pty slave */
/* I hope the range from 0x5480 on is free ... */
......
......@@ -52,6 +52,7 @@
#define TCSETSF2 _IOW('T',0x2D, struct termios2)
#define TIOCGPTN _IOR('T',0x30, unsigned int) /* Get Pty Number (of pty-mux device) */
#define TIOCSPTLCK _IOW('T',0x31, int) /* Lock/unlock Pty */
#define TIOCGDEV _IOR('T',0x32, int) /* Get primary device node of /dev/console */
#define TIOCSIG _IOW('T',0x36, int) /* Generate signal on Pty slave */
#define FIONCLEX 0x5450 /* these numbers need to be adjusted. */
......
......@@ -92,8 +92,6 @@ static int pdc_console_setup(struct console *co, char *options)
static struct timer_list pdc_console_timer;
extern struct console * console_drivers;
static int pdc_console_tty_open(struct tty_struct *tty, struct file *filp)
{
......@@ -169,11 +167,13 @@ static int __init pdc_console_tty_driver_init(void)
* It is unregistered if the pdc console was not selected as the
* primary console. */
struct console *tmp = console_drivers;
struct console *tmp;
for (tmp = console_drivers; tmp; tmp = tmp->next)
acquire_console_sem();
for_each_console(tmp)
if (tmp == &pdc_cons)
break;
release_console_sem();
if (!tmp) {
printk(KERN_INFO "PDC console driver not registered anymore, not creating %s\n", pdc_cons.name);
......
......@@ -94,6 +94,7 @@
#define TIOCSRS485 0x542f
#define TIOCGPTN _IOR('T',0x30, unsigned int) /* Get Pty Number (of pty-mux device) */
#define TIOCSPTLCK _IOW('T',0x31, int) /* Lock/unlock Pty */
#define TIOCGDEV _IOR('T',0x32, unsigned int) /* Get primary device node of /dev/console */
#define TIOCSIG _IOW('T',0x36, int) /* Generate signal on Pty slave */
#define TIOCSERCONFIG 0x5453
......
......@@ -85,6 +85,7 @@
#define TCSETSF2 _IOW('T', 45, struct termios2)
#define TIOCGPTN _IOR('T',0x30, unsigned int) /* Get Pty Number (of pty-mux device) */
#define TIOCSPTLCK _IOW('T',0x31, int) /* Lock/unlock Pty */
#define TIOCGDEV _IOR('T',0x32, unsigned int) /* Get primary device node of /dev/console */
#define TIOCSIG _IOW('T',0x36, int) /* Generate signal on Pty slave */
#define TIOCSERCONFIG _IO('T', 83) /* 0x5453 */
......
......@@ -19,6 +19,7 @@
#define TCSETS2 _IOW('T', 13, struct termios2)
#define TCSETSW2 _IOW('T', 14, struct termios2)
#define TCSETSF2 _IOW('T', 15, struct termios2)
#define TIOCGDEV _IOR('T',0x32, unsigned int) /* Get primary device node of /dev/console */
/* Note that all the ioctls that are not available in Linux have a
* double underscore on the front to: a) avoid some programs to
......
......@@ -98,6 +98,7 @@
#define TCSETSF2 _IOW('T', 45, struct termios2)
#define TIOCGPTN _IOR('T',0x30, unsigned int) /* Get Pty Number (of pty-mux device) */
#define TIOCSPTLCK _IOW('T',0x31, int) /* Lock/unlock Pty */
#define TIOCGDEV _IOR('T',0x32, unsigned int) /* Get primary device node of /dev/console */
#define TIOCSIG _IOW('T',0x36, int) /* Generate signal on Pty slave */
#define TIOCSERCONFIG _IO('T', 83)
......
......@@ -682,6 +682,15 @@ config HVC_UDBG
select HVC_DRIVER
default n
config HVC_DCC
bool "ARM JTAG DCC console"
depends on ARM
select HVC_DRIVER
help
This console uses the JTAG DCC on ARM to create a console under the HVC
driver. This console is used through a JTAG only on ARM. If you don't have
a JTAG then you probably don't want this option.
config VIRTIO_CONSOLE
tristate "Virtio console"
depends on VIRTIO
......
......@@ -34,6 +34,7 @@ obj-$(CONFIG_HVC_CONSOLE) += hvc_vio.o hvsi.o
obj-$(CONFIG_HVC_ISERIES) += hvc_iseries.o
obj-$(CONFIG_HVC_RTAS) += hvc_rtas.o
obj-$(CONFIG_HVC_TILE) += hvc_tile.o
obj-$(CONFIG_HVC_DCC) += hvc_dcc.o
obj-$(CONFIG_HVC_BEAT) += hvc_beat.o
obj-$(CONFIG_HVC_DRIVER) += hvc_console.o
obj-$(CONFIG_HVC_IRQ) += hvc_irq.o
......
/* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
#include <linux/console.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/moduleparam.h>
#include <linux/types.h>
#include <asm/processor.h>
#include "hvc_console.h"
/* DCC Status Bits */
#define DCC_STATUS_RX (1 << 30)
#define DCC_STATUS_TX (1 << 29)
static inline u32 __dcc_getstatus(void)
{
u32 __ret;
asm("mrc p14, 0, %0, c0, c1, 0 @ read comms ctrl reg"
: "=r" (__ret) : : "cc");
return __ret;
}
#if defined(CONFIG_CPU_V7)
static inline char __dcc_getchar(void)
{
char __c;
asm("get_wait: mrc p14, 0, pc, c0, c1, 0 \n\
bne get_wait \n\
mrc p14, 0, %0, c0, c5, 0 @ read comms data reg"
: "=r" (__c) : : "cc");
return __c;
}
#else
static inline char __dcc_getchar(void)
{
char __c;
asm("mrc p14, 0, %0, c0, c5, 0 @ read comms data reg"
: "=r" (__c));
return __c;
}
#endif
#if defined(CONFIG_CPU_V7)
static inline void __dcc_putchar(char c)
{
asm("put_wait: mrc p14, 0, pc, c0, c1, 0 \n\
bcs put_wait \n\
mcr p14, 0, %0, c0, c5, 0 "
: : "r" (c) : "cc");
}
#else
static inline void __dcc_putchar(char c)
{
asm("mcr p14, 0, %0, c0, c5, 0 @ write a char"
: /* no output register */
: "r" (c));
}
#endif
static int hvc_dcc_put_chars(uint32_t vt, const char *buf, int count)
{
int i;
for (i = 0; i < count; i++) {
while (__dcc_getstatus() & DCC_STATUS_TX)
cpu_relax();
__dcc_putchar((char)(buf[i] & 0xFF));
}
return count;
}
static int hvc_dcc_get_chars(uint32_t vt, char *buf, int count)
{
int i;
for (i = 0; i < count; ++i) {
int c = -1;
if (__dcc_getstatus() & DCC_STATUS_RX)
c = __dcc_getchar();
if (c < 0)
break;
buf[i] = c;
}
return i;
}
static const struct hv_ops hvc_dcc_get_put_ops = {
.get_chars = hvc_dcc_get_chars,
.put_chars = hvc_dcc_put_chars,
};
static int __init hvc_dcc_console_init(void)
{
hvc_instantiate(0, 0, &hvc_dcc_get_put_ops);
return 0;
}
console_initcall(hvc_dcc_console_init);
static int __init hvc_dcc_init(void)
{
hvc_alloc(0, 0, &hvc_dcc_get_put_ops, 128);
return 0;
}
device_initcall(hvc_dcc_init);
......@@ -3224,7 +3224,7 @@ ip2trace (unsigned short pn, unsigned char cat, unsigned char label, unsigned lo
MODULE_LICENSE("GPL");
static struct pci_device_id ip2main_pci_tbl[] __devinitdata = {
static struct pci_device_id ip2main_pci_tbl[] __devinitdata __used = {
{ PCI_DEVICE(PCI_VENDOR_ID_COMPUTONE, PCI_DEVICE_ID_COMPUTONE_IP2EX) },
{ }
};
......
......@@ -1764,7 +1764,7 @@ static void rp_flush_buffer(struct tty_struct *tty)
#ifdef CONFIG_PCI
static struct pci_device_id __devinitdata rocket_pci_ids[] = {
static struct pci_device_id __devinitdata __used rocket_pci_ids[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_RP, PCI_ANY_ID) },
{ }
};
......
......@@ -2355,7 +2355,7 @@ static void __exit specialix_exit_module(void)
func_exit();
}
static struct pci_device_id specialx_pci_tbl[] __devinitdata = {
static struct pci_device_id specialx_pci_tbl[] __devinitdata __used = {
{ PCI_DEVICE(PCI_VENDOR_ID_SPECIALIX, PCI_DEVICE_ID_SPECIALIX_IO8) },
{ }
};
......
......@@ -454,21 +454,40 @@ static void tsi_serial_out(struct uart_port *p, int offset, int value)
writeb(value, p->membase + offset);
}
/* Save the LCR value so it can be re-written when a Busy Detect IRQ occurs. */
static inline void dwapb_save_out_value(struct uart_port *p, int offset,
int value)
{
struct uart_8250_port *up =
container_of(p, struct uart_8250_port, port);
if (offset == UART_LCR)
up->lcr = value;
}
/* Read the IER to ensure any interrupt is cleared before returning from ISR. */
static inline void dwapb_check_clear_ier(struct uart_port *p, int offset)
{
if (offset == UART_TX || offset == UART_IER)
p->serial_in(p, UART_IER);
}
static void dwapb_serial_out(struct uart_port *p, int offset, int value)
{
int save_offset = offset;
offset = map_8250_out_reg(p, offset) << p->regshift;
/* Save the LCR value so it can be re-written when a
* Busy Detect interrupt occurs. */
if (save_offset == UART_LCR) {
struct uart_8250_port *up = (struct uart_8250_port *)p;
up->lcr = value;
}
dwapb_save_out_value(p, save_offset, value);
writeb(value, p->membase + offset);
/* Read the IER to ensure any interrupt is cleared before
* returning from ISR. */
if (save_offset == UART_TX || save_offset == UART_IER)
value = p->serial_in(p, UART_IER);
dwapb_check_clear_ier(p, save_offset);
}
static void dwapb32_serial_out(struct uart_port *p, int offset, int value)
{
int save_offset = offset;
offset = map_8250_out_reg(p, offset) << p->regshift;
dwapb_save_out_value(p, save_offset, value);
writel(value, p->membase + offset);
dwapb_check_clear_ier(p, save_offset);
}
static unsigned int io_serial_in(struct uart_port *p, int offset)
......@@ -485,7 +504,8 @@ static void io_serial_out(struct uart_port *p, int offset, int value)
static void set_io_from_upio(struct uart_port *p)
{
struct uart_8250_port *up = (struct uart_8250_port *)p;
struct uart_8250_port *up =
container_of(p, struct uart_8250_port, port);
switch (p->iotype) {
case UPIO_HUB6:
p->serial_in = hub6_serial_in;
......@@ -518,6 +538,11 @@ static void set_io_from_upio(struct uart_port *p)
p->serial_out = dwapb_serial_out;
break;
case UPIO_DWAPB32:
p->serial_in = mem32_serial_in;
p->serial_out = dwapb32_serial_out;
break;
default:
p->serial_in = io_serial_in;
p->serial_out = io_serial_out;
......@@ -536,6 +561,7 @@ serial_out_sync(struct uart_8250_port *up, int offset, int value)
case UPIO_MEM32:
case UPIO_AU:
case UPIO_DWAPB:
case UPIO_DWAPB32:
p->serial_out(p, offset, value);
p->serial_in(p, UART_LCR); /* safe, no side-effects */
break;
......@@ -1319,7 +1345,8 @@ static inline void __stop_tx(struct uart_8250_port *p)
static void serial8250_stop_tx(struct uart_port *port)
{
struct uart_8250_port *up = (struct uart_8250_port *)port;
struct uart_8250_port *up =
container_of(port, struct uart_8250_port, port);
__stop_tx(up);
......@@ -1336,7 +1363,8 @@ static void transmit_chars(struct uart_8250_port *up);
static void serial8250_start_tx(struct uart_port *port)
{
struct uart_8250_port *up = (struct uart_8250_port *)port;
struct uart_8250_port *up =
container_of(port, struct uart_8250_port, port);
if (!(up->ier & UART_IER_THRI)) {
up->ier |= UART_IER_THRI;
......@@ -1364,7 +1392,8 @@ static void serial8250_start_tx(struct uart_port *port)
static void serial8250_stop_rx(struct uart_port *port)
{
struct uart_8250_port *up = (struct uart_8250_port *)port;
struct uart_8250_port *up =
container_of(port, struct uart_8250_port, port);
up->ier &= ~UART_IER_RLSI;
up->port.read_status_mask &= ~UART_LSR_DR;
......@@ -1373,7 +1402,8 @@ static void serial8250_stop_rx(struct uart_port *port)
static void serial8250_enable_ms(struct uart_port *port)
{
struct uart_8250_port *up = (struct uart_8250_port *)port;
struct uart_8250_port *up =
container_of(port, struct uart_8250_port, port);
/* no MSR capabilities */
if (up->bugs & UART_BUG_NOMSR)
......@@ -1581,7 +1611,8 @@ static irqreturn_t serial8250_interrupt(int irq, void *dev_id)
handled = 1;
end = NULL;
} else if (up->port.iotype == UPIO_DWAPB &&
} else if ((up->port.iotype == UPIO_DWAPB ||
up->port.iotype == UPIO_DWAPB32) &&
(iir & UART_IIR_BUSY) == UART_IIR_BUSY) {
/* The DesignWare APB UART has an Busy Detect (0x07)
* interrupt meaning an LCR write attempt occured while the
......@@ -1781,7 +1812,8 @@ static void serial8250_backup_timeout(unsigned long data)
static unsigned int serial8250_tx_empty(struct uart_port *port)
{
struct uart_8250_port *up = (struct uart_8250_port *)port;
struct uart_8250_port *up =
container_of(port, struct uart_8250_port, port);
unsigned long flags;
unsigned int lsr;
......@@ -1795,7 +1827,8 @@ static unsigned int serial8250_tx_empty(struct uart_port *port)
static unsigned int serial8250_get_mctrl(struct uart_port *port)
{
struct uart_8250_port *up = (struct uart_8250_port *)port;
struct uart_8250_port *up =
container_of(port, struct uart_8250_port, port);
unsigned int status;
unsigned int ret;
......@@ -1815,7 +1848,8 @@ static unsigned int serial8250_get_mctrl(struct uart_port *port)
static void serial8250_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
struct uart_8250_port *up = (struct uart_8250_port *)port;
struct uart_8250_port *up =
container_of(port, struct uart_8250_port, port);
unsigned char mcr = 0;
if (mctrl & TIOCM_RTS)
......@@ -1836,7 +1870,8 @@ static void serial8250_set_mctrl(struct uart_port *port, unsigned int mctrl)
static void serial8250_break_ctl(struct uart_port *port, int break_state)
{
struct uart_8250_port *up = (struct uart_8250_port *)port;
struct uart_8250_port *up =
container_of(port, struct uart_8250_port, port);
unsigned long flags;
spin_lock_irqsave(&up->port.lock, flags);
......@@ -1890,7 +1925,8 @@ static void wait_for_xmitr(struct uart_8250_port *up, int bits)
static int serial8250_get_poll_char(struct uart_port *port)
{