kernel-ark/drivers/serial/mux.c
Tejun Heo 5a0e3ad6af include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files.  percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.

percpu.h -> slab.h dependency is about to be removed.  Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability.  As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.

  http://userweb.kernel.org/~tj/misc/slabh-sweep.py

The script does the followings.

* Scan files for gfp and slab usages and update includes such that
  only the necessary includes are there.  ie. if only gfp is used,
  gfp.h, if slab is used, slab.h.

* When the script inserts a new include, it looks at the include
  blocks and try to put the new include such that its order conforms
  to its surrounding.  It's put in the include block which contains
  core kernel includes, in the same order that the rest are ordered -
  alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
  doesn't seem to be any matching order.

* If the script can't find a place to put a new include (mostly
  because the file doesn't have fitting include block), it prints out
  an error message indicating which .h file needs to be added to the
  file.

The conversion was done in the following steps.

1. The initial automatic conversion of all .c files updated slightly
   over 4000 files, deleting around 700 includes and adding ~480 gfp.h
   and ~3000 slab.h inclusions.  The script emitted errors for ~400
   files.

2. Each error was manually checked.  Some didn't need the inclusion,
   some needed manual addition while adding it to implementation .h or
   embedding .c file was more appropriate for others.  This step added
   inclusions to around 150 files.

3. The script was run again and the output was compared to the edits
   from #2 to make sure no file was left behind.

4. Several build tests were done and a couple of problems were fixed.
   e.g. lib/decompress_*.c used malloc/free() wrappers around slab
   APIs requiring slab.h to be added manually.

5. The script was run on all .h files but without automatically
   editing them as sprinkling gfp.h and slab.h inclusions around .h
   files could easily lead to inclusion dependency hell.  Most gfp.h
   inclusion directives were ignored as stuff from gfp.h was usually
   wildly available and often used in preprocessor macros.  Each
   slab.h inclusion directive was examined and added manually as
   necessary.

6. percpu.h was updated not to include slab.h.

7. Build test were done on the following configurations and failures
   were fixed.  CONFIG_GCOV_KERNEL was turned off for all tests (as my
   distributed build env didn't work with gcov compiles) and a few
   more options had to be turned off depending on archs to make things
   build (like ipr on powerpc/64 which failed due to missing writeq).

   * x86 and x86_64 UP and SMP allmodconfig and a custom test config.
   * powerpc and powerpc64 SMP allmodconfig
   * sparc and sparc64 SMP allmodconfig
   * ia64 SMP allmodconfig
   * s390 SMP allmodconfig
   * alpha SMP allmodconfig
   * um on x86_64 SMP allmodconfig

8. percpu.h modifications were reverted so that it could be applied as
   a separate patch and serve as bisection point.

Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.

Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-30 22:02:32 +09:00

634 lines
15 KiB
C

/*
** mux.c:
** serial driver for the Mux console found in some PA-RISC servers.
**
** (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.
**
*/
#include <linux/module.h>
#include <linux/tty.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/serial.h>
#include <linux/console.h>
#include <linux/delay.h> /* for udelay */
#include <linux/device.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/parisc-device.h>
#ifdef CONFIG_MAGIC_SYSRQ
#include <linux/sysrq.h>
#define SUPPORT_SYSRQ
#endif
#include <linux/serial_core.h>
#define MUX_OFFSET 0x800
#define MUX_LINE_OFFSET 0x80
#define MUX_FIFO_SIZE 255
#define MUX_POLL_DELAY (30 * HZ / 1000)
#define IO_DATA_REG_OFFSET 0x3c
#define IO_DCOUNT_REG_OFFSET 0x40
#define MUX_EOFIFO(status) ((status & 0xF000) == 0xF000)
#define MUX_STATUS(status) ((status & 0xF000) == 0x8000)
#define MUX_BREAK(status) ((status & 0xF000) == 0x2000)
#define MUX_NR 256
static unsigned int port_cnt __read_mostly;
struct mux_port {
struct uart_port port;
int enabled;
};
static struct mux_port mux_ports[MUX_NR];
static struct uart_driver mux_driver = {
.owner = THIS_MODULE,
.driver_name = "ttyB",
.dev_name = "ttyB",
.major = MUX_MAJOR,
.minor = 0,
.nr = MUX_NR,
};
static struct timer_list mux_timer;
#define UART_PUT_CHAR(p, c) __raw_writel((c), (p)->membase + IO_DATA_REG_OFFSET)
#define UART_GET_FIFO_CNT(p) __raw_readl((p)->membase + IO_DCOUNT_REG_OFFSET)
/**
* get_mux_port_count - Get the number of available ports on the Mux.
* @dev: The parisc device.
*
* This function is used to determine the number of ports the Mux
* supports. The IODC data reports the number of ports the Mux
* can support, but there are cases where not all the Mux ports
* are connected. This function can override the IODC and
* return the true port count.
*/
static int __init get_mux_port_count(struct parisc_device *dev)
{
int status;
u8 iodc_data[32];
unsigned long bytecnt;
/* If this is the built-in Mux for the K-Class (Eole CAP/MUX),
* we only need to allocate resources for 1 port since the
* other 7 ports are not connected.
*/
if(dev->id.hversion == 0x15)
return 1;
status = pdc_iodc_read(&bytecnt, dev->hpa.start, 0, iodc_data, 32);
BUG_ON(status != PDC_OK);
/* Return the number of ports specified in the iodc data. */
return ((((iodc_data)[4] & 0xf0) >> 4) * 8) + 8;
}
/**
* mux_tx_empty - Check if the transmitter fifo is empty.
* @port: Ptr to the uart_port.
*
* This function test if the transmitter fifo for the port
* described by 'port' is empty. If it is empty, this function
* should return TIOCSER_TEMT, otherwise return 0.
*/
static unsigned int mux_tx_empty(struct uart_port *port)
{
return UART_GET_FIFO_CNT(port) ? 0 : TIOCSER_TEMT;
}
/**
* mux_set_mctrl - Set the current state of the modem control inputs.
* @ports: Ptr to the uart_port.
* @mctrl: Modem control bits.
*
* The Serial MUX does not support CTS, DCD or DSR so this function
* is ignored.
*/
static void mux_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
}
/**
* mux_get_mctrl - Returns the current state of modem control inputs.
* @port: Ptr to the uart_port.
*
* The Serial MUX does not support CTS, DCD or DSR so these lines are
* treated as permanently active.
*/
static unsigned int mux_get_mctrl(struct uart_port *port)
{
return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
}
/**
* mux_stop_tx - Stop transmitting characters.
* @port: Ptr to the uart_port.
*
* The Serial MUX does not support this function.
*/
static void mux_stop_tx(struct uart_port *port)
{
}
/**
* mux_start_tx - Start transmitting characters.
* @port: Ptr to the uart_port.
*
* The Serial Mux does not support this function.
*/
static void mux_start_tx(struct uart_port *port)
{
}
/**
* mux_stop_rx - Stop receiving characters.
* @port: Ptr to the uart_port.
*
* The Serial Mux does not support this function.
*/
static void mux_stop_rx(struct uart_port *port)
{
}
/**
* mux_enable_ms - Enable modum status interrupts.
* @port: Ptr to the uart_port.
*
* The Serial Mux does not support this function.
*/
static void mux_enable_ms(struct uart_port *port)
{
}
/**
* mux_break_ctl - Control the transmitssion of a break signal.
* @port: Ptr to the uart_port.
* @break_state: Raise/Lower the break signal.
*
* The Serial Mux does not support this function.
*/
static void mux_break_ctl(struct uart_port *port, int break_state)
{
}
/**
* mux_write - Write chars to the mux fifo.
* @port: Ptr to the uart_port.
*
* This function writes all the data from the uart buffer to
* the mux fifo.
*/
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;
}
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);
}
/**
* mux_read - Read chars from the mux fifo.
* @port: Ptr to the uart_port.
*
* This reads all available data from the mux's fifo and pushes
* the data to the tty layer.
*/
static void mux_read(struct uart_port *port)
{
int data;
struct tty_struct *tty = port->state->port.tty;
__u32 start_count = port->icount.rx;
while(1) {
data = __raw_readl(port->membase + IO_DATA_REG_OFFSET);
if (MUX_STATUS(data))
continue;
if (MUX_EOFIFO(data))
break;
port->icount.rx++;
if (MUX_BREAK(data)) {
port->icount.brk++;
if(uart_handle_break(port))
continue;
}
if (uart_handle_sysrq_char(port, data & 0xffu))
continue;
tty_insert_flip_char(tty, data & 0xFF, TTY_NORMAL);
}
if (start_count != port->icount.rx) {
tty_flip_buffer_push(tty);
}
}
/**
* mux_startup - Initialize the port.
* @port: Ptr to the uart_port.
*
* Grab any resources needed for this port and start the
* mux timer.
*/
static int mux_startup(struct uart_port *port)
{
mux_ports[port->line].enabled = 1;
return 0;
}
/**
* mux_shutdown - Disable the port.
* @port: Ptr to the uart_port.
*
* Release any resources needed for the port.
*/
static void mux_shutdown(struct uart_port *port)
{
mux_ports[port->line].enabled = 0;
}
/**
* mux_set_termios - Chane port parameters.
* @port: Ptr to the uart_port.
* @termios: new termios settings.
* @old: old termios settings.
*
* The Serial Mux does not support this function.
*/
static void
mux_set_termios(struct uart_port *port, struct ktermios *termios,
struct ktermios *old)
{
}
/**
* mux_type - Describe the port.
* @port: Ptr to the uart_port.
*
* Return a pointer to a string constant describing the
* specified port.
*/
static const char *mux_type(struct uart_port *port)
{
return "Mux";
}
/**
* mux_release_port - Release memory and IO regions.
* @port: Ptr to the uart_port.
*
* Release any memory and IO region resources currently in use by
* the port.
*/
static void mux_release_port(struct uart_port *port)
{
}
/**
* mux_request_port - Request memory and IO regions.
* @port: Ptr to the uart_port.
*
* Request any memory and IO region resources required by the port.
* If any fail, no resources should be registered when this function
* returns, and it should return -EBUSY on failure.
*/
static int mux_request_port(struct uart_port *port)
{
return 0;
}
/**
* mux_config_port - Perform port autoconfiguration.
* @port: Ptr to the uart_port.
* @type: Bitmask of required configurations.
*
* Perform any autoconfiguration steps for the port. This function is
* called if the UPF_BOOT_AUTOCONF flag is specified for the port.
* [Note: This is required for now because of a bug in the Serial core.
* rmk has already submitted a patch to linus, should be available for
* 2.5.47.]
*/
static void mux_config_port(struct uart_port *port, int type)
{
port->type = PORT_MUX;
}
/**
* mux_verify_port - Verify the port information.
* @port: Ptr to the uart_port.
* @ser: Ptr to the serial information.
*
* Verify the new serial port information contained within serinfo is
* suitable for this port type.
*/
static int mux_verify_port(struct uart_port *port, struct serial_struct *ser)
{
if(port->membase == NULL)
return -EINVAL;
return 0;
}
/**
* mux_drv_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)
{
int i;
for(i = 0; i < port_cnt; ++i) {
if(!mux_ports[i].enabled)
continue;
mux_read(&mux_ports[i].port);
mux_write(&mux_ports[i].port);
}
mod_timer(&mux_timer, jiffies + MUX_POLL_DELAY);
}
#ifdef CONFIG_SERIAL_MUX_CONSOLE
static void mux_console_write(struct console *co, const char *s, unsigned count)
{
/* Wait until the FIFO drains. */
while(UART_GET_FIFO_CNT(&mux_ports[0].port))
udelay(1);
while(count--) {
if(*s == '\n') {
UART_PUT_CHAR(&mux_ports[0].port, '\r');
}
UART_PUT_CHAR(&mux_ports[0].port, *s++);
}
}
static int mux_console_setup(struct console *co, char *options)
{
return 0;
}
struct tty_driver *mux_console_device(struct console *co, int *index)
{
*index = co->index;
return mux_driver.tty_driver;
}
static struct console mux_console = {
.name = "ttyB",
.write = mux_console_write,
.device = mux_console_device,
.setup = mux_console_setup,
.flags = CON_ENABLED | CON_PRINTBUFFER,
.index = 0,
};
#define MUX_CONSOLE &mux_console
#else
#define MUX_CONSOLE NULL
#endif
static struct uart_ops mux_pops = {
.tx_empty = mux_tx_empty,
.set_mctrl = mux_set_mctrl,
.get_mctrl = mux_get_mctrl,
.stop_tx = mux_stop_tx,
.start_tx = mux_start_tx,
.stop_rx = mux_stop_rx,
.enable_ms = mux_enable_ms,
.break_ctl = mux_break_ctl,
.startup = mux_startup,
.shutdown = mux_shutdown,
.set_termios = mux_set_termios,
.type = mux_type,
.release_port = mux_release_port,
.request_port = mux_request_port,
.config_port = mux_config_port,
.verify_port = mux_verify_port,
};
/**
* mux_probe - Determine if the Serial Mux should claim this device.
* @dev: The parisc device.
*
* Deterimine if the Serial Mux should claim this chip (return 0)
* or not (return 1).
*/
static int __init mux_probe(struct parisc_device *dev)
{
int i, status;
int port_count = get_mux_port_count(dev);
printk(KERN_INFO "Serial mux driver (%d ports) Revision: 0.6\n", port_count);
dev_set_drvdata(&dev->dev, (void *)(long)port_count);
request_mem_region(dev->hpa.start + MUX_OFFSET,
port_count * MUX_LINE_OFFSET, "Mux");
if(!port_cnt) {
mux_driver.cons = MUX_CONSOLE;
status = uart_register_driver(&mux_driver);
if(status) {
printk(KERN_ERR "Serial mux: Unable to register driver.\n");
return 1;
}
}
for(i = 0; i < port_count; ++i, ++port_cnt) {
struct uart_port *port = &mux_ports[port_cnt].port;
port->iobase = 0;
port->mapbase = dev->hpa.start + MUX_OFFSET +
(i * MUX_LINE_OFFSET);
port->membase = ioremap_nocache(port->mapbase, MUX_LINE_OFFSET);
port->iotype = UPIO_MEM;
port->type = PORT_MUX;
port->irq = NO_IRQ;
port->uartclk = 0;
port->fifosize = MUX_FIFO_SIZE;
port->ops = &mux_pops;
port->flags = UPF_BOOT_AUTOCONF;
port->line = port_cnt;
/* 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);
BUG_ON(status);
}
return 0;
}
static int __devexit mux_remove(struct parisc_device *dev)
{
int i, j;
int port_count = (long)dev_get_drvdata(&dev->dev);
/* Find Port 0 for this card in the mux_ports list. */
for(i = 0; i < port_cnt; ++i) {
if(mux_ports[i].port.mapbase == dev->hpa.start + MUX_OFFSET)
break;
}
BUG_ON(i + port_count > port_cnt);
/* Release the resources associated with each port on the device. */
for(j = 0; j < port_count; ++j, ++i) {
struct uart_port *port = &mux_ports[i].port;
uart_remove_one_port(&mux_driver, port);
if(port->membase)
iounmap(port->membase);
}
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
* the serial port detection in the proper order. The idea is we always
* want the builtin mux to be detected before addin mux cards, so we
* specifically probe for the builtin mux cards first.
*
* 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[] = {
{ 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[] = {
{ HPHW_A_DIRECT, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0000D },
{ 0, }
};
MODULE_DEVICE_TABLE(parisc, builtin_mux_tbl);
MODULE_DEVICE_TABLE(parisc, mux_tbl);
static struct parisc_driver builtin_serial_mux_driver = {
.name = "builtin_serial_mux",
.id_table = builtin_mux_tbl,
.probe = mux_probe,
.remove = __devexit_p(mux_remove),
};
static struct parisc_driver serial_mux_driver = {
.name = "serial_mux",
.id_table = mux_tbl,
.probe = mux_probe,
.remove = __devexit_p(mux_remove),
};
/**
* mux_init - Serial MUX initialization procedure.
*
* Register the Serial MUX driver.
*/
static int __init mux_init(void)
{
register_parisc_driver(&builtin_serial_mux_driver);
register_parisc_driver(&serial_mux_driver);
if(port_cnt > 0) {
/* Start the Mux timer */
init_timer(&mux_timer);
mux_timer.function = mux_poll;
mod_timer(&mux_timer, jiffies + MUX_POLL_DELAY);
#ifdef CONFIG_SERIAL_MUX_CONSOLE
register_console(&mux_console);
#endif
}
return 0;
}
/**
* mux_exit - Serial MUX cleanup procedure.
*
* Unregister the Serial MUX driver from the tty layer.
*/
static void __exit mux_exit(void)
{
/* Delete the Mux timer. */
if(port_cnt > 0) {
del_timer(&mux_timer);
#ifdef CONFIG_SERIAL_MUX_CONSOLE
unregister_console(&mux_console);
#endif
}
unregister_parisc_driver(&builtin_serial_mux_driver);
unregister_parisc_driver(&serial_mux_driver);
uart_unregister_driver(&mux_driver);
}
module_init(mux_init);
module_exit(mux_exit);
MODULE_AUTHOR("Ryan Bradetich");
MODULE_DESCRIPTION("Serial MUX driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS_CHARDEV_MAJOR(MUX_MAJOR);