linux/drivers/char/vme_scc.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

1145 lines
30 KiB
C

/*
* drivers/char/vme_scc.c: MVME147, MVME162, BVME6000 SCC serial ports
* implementation.
* Copyright 1999 Richard Hirst <richard@sleepie.demon.co.uk>
*
* Based on atari_SCC.c which was
* Copyright 1994-95 Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de>
* Partially based on PC-Linux serial.c by Linus Torvalds and Theodore Ts'o
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive
* for more details.
*
*/
#include <linux/module.h>
#include <linux/kdev_t.h>
#include <asm/io.h>
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/errno.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/mm.h>
#include <linux/serial.h>
#include <linux/fcntl.h>
#include <linux/major.h>
#include <linux/delay.h>
#include <linux/miscdevice.h>
#include <linux/console.h>
#include <linux/init.h>
#include <asm/setup.h>
#include <asm/bootinfo.h>
#ifdef CONFIG_MVME147_SCC
#include <asm/mvme147hw.h>
#endif
#ifdef CONFIG_MVME162_SCC
#include <asm/mvme16xhw.h>
#endif
#ifdef CONFIG_BVME6000_SCC
#include <asm/bvme6000hw.h>
#endif
#include <linux/generic_serial.h>
#include "scc.h"
#define CHANNEL_A 0
#define CHANNEL_B 1
#define SCC_MINOR_BASE 64
/* Shadows for all SCC write registers */
static unsigned char scc_shadow[2][16];
/* Location to access for SCC register access delay */
static volatile unsigned char *scc_del = NULL;
/* To keep track of STATUS_REG state for detection of Ext/Status int source */
static unsigned char scc_last_status_reg[2];
/***************************** Prototypes *****************************/
/* Function prototypes */
static void scc_disable_tx_interrupts(void * ptr);
static void scc_enable_tx_interrupts(void * ptr);
static void scc_disable_rx_interrupts(void * ptr);
static void scc_enable_rx_interrupts(void * ptr);
static int scc_carrier_raised(struct tty_port *port);
static void scc_shutdown_port(void * ptr);
static int scc_set_real_termios(void *ptr);
static void scc_hungup(void *ptr);
static void scc_close(void *ptr);
static int scc_chars_in_buffer(void * ptr);
static int scc_open(struct tty_struct * tty, struct file * filp);
static int scc_ioctl(struct tty_struct * tty, struct file * filp,
unsigned int cmd, unsigned long arg);
static void scc_throttle(struct tty_struct *tty);
static void scc_unthrottle(struct tty_struct *tty);
static irqreturn_t scc_tx_int(int irq, void *data);
static irqreturn_t scc_rx_int(int irq, void *data);
static irqreturn_t scc_stat_int(int irq, void *data);
static irqreturn_t scc_spcond_int(int irq, void *data);
static void scc_setsignals(struct scc_port *port, int dtr, int rts);
static int scc_break_ctl(struct tty_struct *tty, int break_state);
static struct tty_driver *scc_driver;
static struct scc_port scc_ports[2];
/*---------------------------------------------------------------------------
* Interface from generic_serial.c back here
*--------------------------------------------------------------------------*/
static struct real_driver scc_real_driver = {
scc_disable_tx_interrupts,
scc_enable_tx_interrupts,
scc_disable_rx_interrupts,
scc_enable_rx_interrupts,
scc_shutdown_port,
scc_set_real_termios,
scc_chars_in_buffer,
scc_close,
scc_hungup,
NULL
};
static const struct tty_operations scc_ops = {
.open = scc_open,
.close = gs_close,
.write = gs_write,
.put_char = gs_put_char,
.flush_chars = gs_flush_chars,
.write_room = gs_write_room,
.chars_in_buffer = gs_chars_in_buffer,
.flush_buffer = gs_flush_buffer,
.ioctl = scc_ioctl,
.throttle = scc_throttle,
.unthrottle = scc_unthrottle,
.set_termios = gs_set_termios,
.stop = gs_stop,
.start = gs_start,
.hangup = gs_hangup,
.break_ctl = scc_break_ctl,
};
static const struct tty_port_operations scc_port_ops = {
.carrier_raised = scc_carrier_raised,
};
/*----------------------------------------------------------------------------
* vme_scc_init() and support functions
*---------------------------------------------------------------------------*/
static int __init scc_init_drivers(void)
{
int error;
scc_driver = alloc_tty_driver(2);
if (!scc_driver)
return -ENOMEM;
scc_driver->owner = THIS_MODULE;
scc_driver->driver_name = "scc";
scc_driver->name = "ttyS";
scc_driver->major = TTY_MAJOR;
scc_driver->minor_start = SCC_MINOR_BASE;
scc_driver->type = TTY_DRIVER_TYPE_SERIAL;
scc_driver->subtype = SERIAL_TYPE_NORMAL;
scc_driver->init_termios = tty_std_termios;
scc_driver->init_termios.c_cflag =
B9600 | CS8 | CREAD | HUPCL | CLOCAL;
scc_driver->init_termios.c_ispeed = 9600;
scc_driver->init_termios.c_ospeed = 9600;
scc_driver->flags = TTY_DRIVER_REAL_RAW;
tty_set_operations(scc_driver, &scc_ops);
if ((error = tty_register_driver(scc_driver))) {
printk(KERN_ERR "scc: Couldn't register scc driver, error = %d\n",
error);
put_tty_driver(scc_driver);
return 1;
}
return 0;
}
/* ports[] array is indexed by line no (i.e. [0] for ttyS0, [1] for ttyS1).
*/
static void __init scc_init_portstructs(void)
{
struct scc_port *port;
int i;
for (i = 0; i < 2; i++) {
port = scc_ports + i;
tty_port_init(&port->gs.port);
port->gs.port.ops = &scc_port_ops;
port->gs.magic = SCC_MAGIC;
port->gs.close_delay = HZ/2;
port->gs.closing_wait = 30 * HZ;
port->gs.rd = &scc_real_driver;
#ifdef NEW_WRITE_LOCKING
port->gs.port_write_mutex = MUTEX;
#endif
init_waitqueue_head(&port->gs.port.open_wait);
init_waitqueue_head(&port->gs.port.close_wait);
}
}
#ifdef CONFIG_MVME147_SCC
static int __init mvme147_scc_init(void)
{
struct scc_port *port;
int error;
printk(KERN_INFO "SCC: MVME147 Serial Driver\n");
/* Init channel A */
port = &scc_ports[0];
port->channel = CHANNEL_A;
port->ctrlp = (volatile unsigned char *)M147_SCC_A_ADDR;
port->datap = port->ctrlp + 1;
port->port_a = &scc_ports[0];
port->port_b = &scc_ports[1];
error = request_irq(MVME147_IRQ_SCCA_TX, scc_tx_int, IRQF_DISABLED,
"SCC-A TX", port);
if (error)
goto fail;
error = request_irq(MVME147_IRQ_SCCA_STAT, scc_stat_int, IRQF_DISABLED,
"SCC-A status", port);
if (error)
goto fail_free_a_tx;
error = request_irq(MVME147_IRQ_SCCA_RX, scc_rx_int, IRQF_DISABLED,
"SCC-A RX", port);
if (error)
goto fail_free_a_stat;
error = request_irq(MVME147_IRQ_SCCA_SPCOND, scc_spcond_int,
IRQF_DISABLED, "SCC-A special cond", port);
if (error)
goto fail_free_a_rx;
{
SCC_ACCESS_INIT(port);
/* disable interrupts for this channel */
SCCwrite(INT_AND_DMA_REG, 0);
/* Set the interrupt vector */
SCCwrite(INT_VECTOR_REG, MVME147_IRQ_SCC_BASE);
/* Interrupt parameters: vector includes status, status low */
SCCwrite(MASTER_INT_CTRL, MIC_VEC_INCL_STAT);
SCCmod(MASTER_INT_CTRL, 0xff, MIC_MASTER_INT_ENAB);
}
/* Init channel B */
port = &scc_ports[1];
port->channel = CHANNEL_B;
port->ctrlp = (volatile unsigned char *)M147_SCC_B_ADDR;
port->datap = port->ctrlp + 1;
port->port_a = &scc_ports[0];
port->port_b = &scc_ports[1];
error = request_irq(MVME147_IRQ_SCCB_TX, scc_tx_int, IRQF_DISABLED,
"SCC-B TX", port);
if (error)
goto fail_free_a_spcond;
error = request_irq(MVME147_IRQ_SCCB_STAT, scc_stat_int, IRQF_DISABLED,
"SCC-B status", port);
if (error)
goto fail_free_b_tx;
error = request_irq(MVME147_IRQ_SCCB_RX, scc_rx_int, IRQF_DISABLED,
"SCC-B RX", port);
if (error)
goto fail_free_b_stat;
error = request_irq(MVME147_IRQ_SCCB_SPCOND, scc_spcond_int,
IRQF_DISABLED, "SCC-B special cond", port);
if (error)
goto fail_free_b_rx;
{
SCC_ACCESS_INIT(port);
/* disable interrupts for this channel */
SCCwrite(INT_AND_DMA_REG, 0);
}
/* Ensure interrupts are enabled in the PCC chip */
m147_pcc->serial_cntrl=PCC_LEVEL_SERIAL|PCC_INT_ENAB;
/* Initialise the tty driver structures and register */
scc_init_portstructs();
scc_init_drivers();
return 0;
fail_free_b_rx:
free_irq(MVME147_IRQ_SCCB_RX, port);
fail_free_b_stat:
free_irq(MVME147_IRQ_SCCB_STAT, port);
fail_free_b_tx:
free_irq(MVME147_IRQ_SCCB_TX, port);
fail_free_a_spcond:
free_irq(MVME147_IRQ_SCCA_SPCOND, port);
fail_free_a_rx:
free_irq(MVME147_IRQ_SCCA_RX, port);
fail_free_a_stat:
free_irq(MVME147_IRQ_SCCA_STAT, port);
fail_free_a_tx:
free_irq(MVME147_IRQ_SCCA_TX, port);
fail:
return error;
}
#endif
#ifdef CONFIG_MVME162_SCC
static int __init mvme162_scc_init(void)
{
struct scc_port *port;
int error;
if (!(mvme16x_config & MVME16x_CONFIG_GOT_SCCA))
return (-ENODEV);
printk(KERN_INFO "SCC: MVME162 Serial Driver\n");
/* Init channel A */
port = &scc_ports[0];
port->channel = CHANNEL_A;
port->ctrlp = (volatile unsigned char *)MVME_SCC_A_ADDR;
port->datap = port->ctrlp + 2;
port->port_a = &scc_ports[0];
port->port_b = &scc_ports[1];
error = request_irq(MVME162_IRQ_SCCA_TX, scc_tx_int, IRQF_DISABLED,
"SCC-A TX", port);
if (error)
goto fail;
error = request_irq(MVME162_IRQ_SCCA_STAT, scc_stat_int, IRQF_DISABLED,
"SCC-A status", port);
if (error)
goto fail_free_a_tx;
error = request_irq(MVME162_IRQ_SCCA_RX, scc_rx_int, IRQF_DISABLED,
"SCC-A RX", port);
if (error)
goto fail_free_a_stat;
error = request_irq(MVME162_IRQ_SCCA_SPCOND, scc_spcond_int,
IRQF_DISABLED, "SCC-A special cond", port);
if (error)
goto fail_free_a_rx;
{
SCC_ACCESS_INIT(port);
/* disable interrupts for this channel */
SCCwrite(INT_AND_DMA_REG, 0);
/* Set the interrupt vector */
SCCwrite(INT_VECTOR_REG, MVME162_IRQ_SCC_BASE);
/* Interrupt parameters: vector includes status, status low */
SCCwrite(MASTER_INT_CTRL, MIC_VEC_INCL_STAT);
SCCmod(MASTER_INT_CTRL, 0xff, MIC_MASTER_INT_ENAB);
}
/* Init channel B */
port = &scc_ports[1];
port->channel = CHANNEL_B;
port->ctrlp = (volatile unsigned char *)MVME_SCC_B_ADDR;
port->datap = port->ctrlp + 2;
port->port_a = &scc_ports[0];
port->port_b = &scc_ports[1];
error = request_irq(MVME162_IRQ_SCCB_TX, scc_tx_int, IRQF_DISABLED,
"SCC-B TX", port);
if (error)
goto fail_free_a_spcond;
error = request_irq(MVME162_IRQ_SCCB_STAT, scc_stat_int, IRQF_DISABLED,
"SCC-B status", port);
if (error)
goto fail_free_b_tx;
error = request_irq(MVME162_IRQ_SCCB_RX, scc_rx_int, IRQF_DISABLED,
"SCC-B RX", port);
if (error)
goto fail_free_b_stat;
error = request_irq(MVME162_IRQ_SCCB_SPCOND, scc_spcond_int,
IRQF_DISABLED, "SCC-B special cond", port);
if (error)
goto fail_free_b_rx;
{
SCC_ACCESS_INIT(port); /* Either channel will do */
/* disable interrupts for this channel */
SCCwrite(INT_AND_DMA_REG, 0);
}
/* Ensure interrupts are enabled in the MC2 chip */
*(volatile char *)0xfff4201d = 0x14;
/* Initialise the tty driver structures and register */
scc_init_portstructs();
scc_init_drivers();
return 0;
fail_free_b_rx:
free_irq(MVME162_IRQ_SCCB_RX, port);
fail_free_b_stat:
free_irq(MVME162_IRQ_SCCB_STAT, port);
fail_free_b_tx:
free_irq(MVME162_IRQ_SCCB_TX, port);
fail_free_a_spcond:
free_irq(MVME162_IRQ_SCCA_SPCOND, port);
fail_free_a_rx:
free_irq(MVME162_IRQ_SCCA_RX, port);
fail_free_a_stat:
free_irq(MVME162_IRQ_SCCA_STAT, port);
fail_free_a_tx:
free_irq(MVME162_IRQ_SCCA_TX, port);
fail:
return error;
}
#endif
#ifdef CONFIG_BVME6000_SCC
static int __init bvme6000_scc_init(void)
{
struct scc_port *port;
int error;
printk(KERN_INFO "SCC: BVME6000 Serial Driver\n");
/* Init channel A */
port = &scc_ports[0];
port->channel = CHANNEL_A;
port->ctrlp = (volatile unsigned char *)BVME_SCC_A_ADDR;
port->datap = port->ctrlp + 4;
port->port_a = &scc_ports[0];
port->port_b = &scc_ports[1];
error = request_irq(BVME_IRQ_SCCA_TX, scc_tx_int, IRQF_DISABLED,
"SCC-A TX", port);
if (error)
goto fail;
error = request_irq(BVME_IRQ_SCCA_STAT, scc_stat_int, IRQF_DISABLED,
"SCC-A status", port);
if (error)
goto fail_free_a_tx;
error = request_irq(BVME_IRQ_SCCA_RX, scc_rx_int, IRQF_DISABLED,
"SCC-A RX", port);
if (error)
goto fail_free_a_stat;
error = request_irq(BVME_IRQ_SCCA_SPCOND, scc_spcond_int,
IRQF_DISABLED, "SCC-A special cond", port);
if (error)
goto fail_free_a_rx;
{
SCC_ACCESS_INIT(port);
/* disable interrupts for this channel */
SCCwrite(INT_AND_DMA_REG, 0);
/* Set the interrupt vector */
SCCwrite(INT_VECTOR_REG, BVME_IRQ_SCC_BASE);
/* Interrupt parameters: vector includes status, status low */
SCCwrite(MASTER_INT_CTRL, MIC_VEC_INCL_STAT);
SCCmod(MASTER_INT_CTRL, 0xff, MIC_MASTER_INT_ENAB);
}
/* Init channel B */
port = &scc_ports[1];
port->channel = CHANNEL_B;
port->ctrlp = (volatile unsigned char *)BVME_SCC_B_ADDR;
port->datap = port->ctrlp + 4;
port->port_a = &scc_ports[0];
port->port_b = &scc_ports[1];
error = request_irq(BVME_IRQ_SCCB_TX, scc_tx_int, IRQF_DISABLED,
"SCC-B TX", port);
if (error)
goto fail_free_a_spcond;
error = request_irq(BVME_IRQ_SCCB_STAT, scc_stat_int, IRQF_DISABLED,
"SCC-B status", port);
if (error)
goto fail_free_b_tx;
error = request_irq(BVME_IRQ_SCCB_RX, scc_rx_int, IRQF_DISABLED,
"SCC-B RX", port);
if (error)
goto fail_free_b_stat;
error = request_irq(BVME_IRQ_SCCB_SPCOND, scc_spcond_int,
IRQF_DISABLED, "SCC-B special cond", port);
if (error)
goto fail_free_b_rx;
{
SCC_ACCESS_INIT(port); /* Either channel will do */
/* disable interrupts for this channel */
SCCwrite(INT_AND_DMA_REG, 0);
}
/* Initialise the tty driver structures and register */
scc_init_portstructs();
scc_init_drivers();
return 0;
fail:
free_irq(BVME_IRQ_SCCA_STAT, port);
fail_free_a_tx:
free_irq(BVME_IRQ_SCCA_RX, port);
fail_free_a_stat:
free_irq(BVME_IRQ_SCCA_SPCOND, port);
fail_free_a_rx:
free_irq(BVME_IRQ_SCCB_TX, port);
fail_free_a_spcond:
free_irq(BVME_IRQ_SCCB_STAT, port);
fail_free_b_tx:
free_irq(BVME_IRQ_SCCB_RX, port);
fail_free_b_stat:
free_irq(BVME_IRQ_SCCB_SPCOND, port);
fail_free_b_rx:
return error;
}
#endif
static int __init vme_scc_init(void)
{
int res = -ENODEV;
#ifdef CONFIG_MVME147_SCC
if (MACH_IS_MVME147)
res = mvme147_scc_init();
#endif
#ifdef CONFIG_MVME162_SCC
if (MACH_IS_MVME16x)
res = mvme162_scc_init();
#endif
#ifdef CONFIG_BVME6000_SCC
if (MACH_IS_BVME6000)
res = bvme6000_scc_init();
#endif
return res;
}
module_init(vme_scc_init);
/*---------------------------------------------------------------------------
* Interrupt handlers
*--------------------------------------------------------------------------*/
static irqreturn_t scc_rx_int(int irq, void *data)
{
unsigned char ch;
struct scc_port *port = data;
struct tty_struct *tty = port->gs.port.tty;
SCC_ACCESS_INIT(port);
ch = SCCread_NB(RX_DATA_REG);
if (!tty) {
printk(KERN_WARNING "scc_rx_int with NULL tty!\n");
SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
return IRQ_HANDLED;
}
tty_insert_flip_char(tty, ch, 0);
/* Check if another character is already ready; in that case, the
* spcond_int() function must be used, because this character may have an
* error condition that isn't signalled by the interrupt vector used!
*/
if (SCCread(INT_PENDING_REG) &
(port->channel == CHANNEL_A ? IPR_A_RX : IPR_B_RX)) {
scc_spcond_int (irq, data);
return IRQ_HANDLED;
}
SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
tty_flip_buffer_push(tty);
return IRQ_HANDLED;
}
static irqreturn_t scc_spcond_int(int irq, void *data)
{
struct scc_port *port = data;
struct tty_struct *tty = port->gs.port.tty;
unsigned char stat, ch, err;
int int_pending_mask = port->channel == CHANNEL_A ?
IPR_A_RX : IPR_B_RX;
SCC_ACCESS_INIT(port);
if (!tty) {
printk(KERN_WARNING "scc_spcond_int with NULL tty!\n");
SCCwrite(COMMAND_REG, CR_ERROR_RESET);
SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
return IRQ_HANDLED;
}
do {
stat = SCCread(SPCOND_STATUS_REG);
ch = SCCread_NB(RX_DATA_REG);
if (stat & SCSR_RX_OVERRUN)
err = TTY_OVERRUN;
else if (stat & SCSR_PARITY_ERR)
err = TTY_PARITY;
else if (stat & SCSR_CRC_FRAME_ERR)
err = TTY_FRAME;
else
err = 0;
tty_insert_flip_char(tty, ch, err);
/* ++TeSche: *All* errors have to be cleared manually,
* else the condition persists for the next chars
*/
if (err)
SCCwrite(COMMAND_REG, CR_ERROR_RESET);
} while(SCCread(INT_PENDING_REG) & int_pending_mask);
SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
tty_flip_buffer_push(tty);
return IRQ_HANDLED;
}
static irqreturn_t scc_tx_int(int irq, void *data)
{
struct scc_port *port = data;
SCC_ACCESS_INIT(port);
if (!port->gs.port.tty) {
printk(KERN_WARNING "scc_tx_int with NULL tty!\n");
SCCmod (INT_AND_DMA_REG, ~IDR_TX_INT_ENAB, 0);
SCCwrite(COMMAND_REG, CR_TX_PENDING_RESET);
SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
return IRQ_HANDLED;
}
while ((SCCread_NB(STATUS_REG) & SR_TX_BUF_EMPTY)) {
if (port->x_char) {
SCCwrite(TX_DATA_REG, port->x_char);
port->x_char = 0;
}
else if ((port->gs.xmit_cnt <= 0) ||
port->gs.port.tty->stopped ||
port->gs.port.tty->hw_stopped)
break;
else {
SCCwrite(TX_DATA_REG, port->gs.xmit_buf[port->gs.xmit_tail++]);
port->gs.xmit_tail = port->gs.xmit_tail & (SERIAL_XMIT_SIZE-1);
if (--port->gs.xmit_cnt <= 0)
break;
}
}
if ((port->gs.xmit_cnt <= 0) || port->gs.port.tty->stopped ||
port->gs.port.tty->hw_stopped) {
/* disable tx interrupts */
SCCmod (INT_AND_DMA_REG, ~IDR_TX_INT_ENAB, 0);
SCCwrite(COMMAND_REG, CR_TX_PENDING_RESET); /* disable tx_int on next tx underrun? */
port->gs.port.flags &= ~GS_TX_INTEN;
}
if (port->gs.port.tty && port->gs.xmit_cnt <= port->gs.wakeup_chars)
tty_wakeup(port->gs.port.tty);
SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
return IRQ_HANDLED;
}
static irqreturn_t scc_stat_int(int irq, void *data)
{
struct scc_port *port = data;
unsigned channel = port->channel;
unsigned char last_sr, sr, changed;
SCC_ACCESS_INIT(port);
last_sr = scc_last_status_reg[channel];
sr = scc_last_status_reg[channel] = SCCread_NB(STATUS_REG);
changed = last_sr ^ sr;
if (changed & SR_DCD) {
port->c_dcd = !!(sr & SR_DCD);
if (!(port->gs.port.flags & ASYNC_CHECK_CD))
; /* Don't report DCD changes */
else if (port->c_dcd) {
wake_up_interruptible(&port->gs.port.open_wait);
}
else {
if (port->gs.port.tty)
tty_hangup (port->gs.port.tty);
}
}
SCCwrite(COMMAND_REG, CR_EXTSTAT_RESET);
SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
return IRQ_HANDLED;
}
/*---------------------------------------------------------------------------
* generic_serial.c callback funtions
*--------------------------------------------------------------------------*/
static void scc_disable_tx_interrupts(void *ptr)
{
struct scc_port *port = ptr;
unsigned long flags;
SCC_ACCESS_INIT(port);
local_irq_save(flags);
SCCmod(INT_AND_DMA_REG, ~IDR_TX_INT_ENAB, 0);
port->gs.port.flags &= ~GS_TX_INTEN;
local_irq_restore(flags);
}
static void scc_enable_tx_interrupts(void *ptr)
{
struct scc_port *port = ptr;
unsigned long flags;
SCC_ACCESS_INIT(port);
local_irq_save(flags);
SCCmod(INT_AND_DMA_REG, 0xff, IDR_TX_INT_ENAB);
/* restart the transmitter */
scc_tx_int (0, port);
local_irq_restore(flags);
}
static void scc_disable_rx_interrupts(void *ptr)
{
struct scc_port *port = ptr;
unsigned long flags;
SCC_ACCESS_INIT(port);
local_irq_save(flags);
SCCmod(INT_AND_DMA_REG,
~(IDR_RX_INT_MASK|IDR_PARERR_AS_SPCOND|IDR_EXTSTAT_INT_ENAB), 0);
local_irq_restore(flags);
}
static void scc_enable_rx_interrupts(void *ptr)
{
struct scc_port *port = ptr;
unsigned long flags;
SCC_ACCESS_INIT(port);
local_irq_save(flags);
SCCmod(INT_AND_DMA_REG, 0xff,
IDR_EXTSTAT_INT_ENAB|IDR_PARERR_AS_SPCOND|IDR_RX_INT_ALL);
local_irq_restore(flags);
}
static int scc_carrier_raised(struct tty_port *port)
{
struct scc_port *sc = container_of(port, struct scc_port, gs.port);
unsigned channel = sc->channel;
return !!(scc_last_status_reg[channel] & SR_DCD);
}
static void scc_shutdown_port(void *ptr)
{
struct scc_port *port = ptr;
port->gs.port.flags &= ~ GS_ACTIVE;
if (port->gs.port.tty && (port->gs.port.tty->termios->c_cflag & HUPCL)) {
scc_setsignals (port, 0, 0);
}
}
static int scc_set_real_termios (void *ptr)
{
/* the SCC has char sizes 5,7,6,8 in that order! */
static int chsize_map[4] = { 0, 2, 1, 3 };
unsigned cflag, baud, chsize, channel, brgval = 0;
unsigned long flags;
struct scc_port *port = ptr;
SCC_ACCESS_INIT(port);
if (!port->gs.port.tty || !port->gs.port.tty->termios) return 0;
channel = port->channel;
if (channel == CHANNEL_A)
return 0; /* Settings controlled by boot PROM */
cflag = port->gs.port.tty->termios->c_cflag;
baud = port->gs.baud;
chsize = (cflag & CSIZE) >> 4;
if (baud == 0) {
/* speed == 0 -> drop DTR */
local_irq_save(flags);
SCCmod(TX_CTRL_REG, ~TCR_DTR, 0);
local_irq_restore(flags);
return 0;
}
else if ((MACH_IS_MVME16x && (baud < 50 || baud > 38400)) ||
(MACH_IS_MVME147 && (baud < 50 || baud > 19200)) ||
(MACH_IS_BVME6000 &&(baud < 50 || baud > 76800))) {
printk(KERN_NOTICE "SCC: Bad speed requested, %d\n", baud);
return 0;
}
if (cflag & CLOCAL)
port->gs.port.flags &= ~ASYNC_CHECK_CD;
else
port->gs.port.flags |= ASYNC_CHECK_CD;
#ifdef CONFIG_MVME147_SCC
if (MACH_IS_MVME147)
brgval = (M147_SCC_PCLK + baud/2) / (16 * 2 * baud) - 2;
#endif
#ifdef CONFIG_MVME162_SCC
if (MACH_IS_MVME16x)
brgval = (MVME_SCC_PCLK + baud/2) / (16 * 2 * baud) - 2;
#endif
#ifdef CONFIG_BVME6000_SCC
if (MACH_IS_BVME6000)
brgval = (BVME_SCC_RTxC + baud/2) / (16 * 2 * baud) - 2;
#endif
/* Now we have all parameters and can go to set them: */
local_irq_save(flags);
/* receiver's character size and auto-enables */
SCCmod(RX_CTRL_REG, ~(RCR_CHSIZE_MASK|RCR_AUTO_ENAB_MODE),
(chsize_map[chsize] << 6) |
((cflag & CRTSCTS) ? RCR_AUTO_ENAB_MODE : 0));
/* parity and stop bits (both, Tx and Rx), clock mode never changes */
SCCmod (AUX1_CTRL_REG,
~(A1CR_PARITY_MASK | A1CR_MODE_MASK),
((cflag & PARENB
? (cflag & PARODD ? A1CR_PARITY_ODD : A1CR_PARITY_EVEN)
: A1CR_PARITY_NONE)
| (cflag & CSTOPB ? A1CR_MODE_ASYNC_2 : A1CR_MODE_ASYNC_1)));
/* sender's character size, set DTR for valid baud rate */
SCCmod(TX_CTRL_REG, ~TCR_CHSIZE_MASK, chsize_map[chsize] << 5 | TCR_DTR);
/* clock sources never change */
/* disable BRG before changing the value */
SCCmod(DPLL_CTRL_REG, ~DCR_BRG_ENAB, 0);
/* BRG value */
SCCwrite(TIMER_LOW_REG, brgval & 0xff);
SCCwrite(TIMER_HIGH_REG, (brgval >> 8) & 0xff);
/* BRG enable, and clock source never changes */
SCCmod(DPLL_CTRL_REG, 0xff, DCR_BRG_ENAB);
local_irq_restore(flags);
return 0;
}
static int scc_chars_in_buffer (void *ptr)
{
struct scc_port *port = ptr;
SCC_ACCESS_INIT(port);
return (SCCread (SPCOND_STATUS_REG) & SCSR_ALL_SENT) ? 0 : 1;
}
/* Comment taken from sx.c (2.4.0):
I haven't the foggiest why the decrement use count has to happen
here. The whole linux serial drivers stuff needs to be redesigned.
My guess is that this is a hack to minimize the impact of a bug
elsewhere. Thinking about it some more. (try it sometime) Try
running minicom on a serial port that is driven by a modularized
driver. Have the modem hangup. Then remove the driver module. Then
exit minicom. I expect an "oops". -- REW */
static void scc_hungup(void *ptr)
{
scc_disable_tx_interrupts(ptr);
scc_disable_rx_interrupts(ptr);
}
static void scc_close(void *ptr)
{
scc_disable_tx_interrupts(ptr);
scc_disable_rx_interrupts(ptr);
}
/*---------------------------------------------------------------------------
* Internal support functions
*--------------------------------------------------------------------------*/
static void scc_setsignals(struct scc_port *port, int dtr, int rts)
{
unsigned long flags;
unsigned char t;
SCC_ACCESS_INIT(port);
local_irq_save(flags);
t = SCCread(TX_CTRL_REG);
if (dtr >= 0) t = dtr? (t | TCR_DTR): (t & ~TCR_DTR);
if (rts >= 0) t = rts? (t | TCR_RTS): (t & ~TCR_RTS);
SCCwrite(TX_CTRL_REG, t);
local_irq_restore(flags);
}
static void scc_send_xchar(struct tty_struct *tty, char ch)
{
struct scc_port *port = tty->driver_data;
port->x_char = ch;
if (ch)
scc_enable_tx_interrupts(port);
}
/*---------------------------------------------------------------------------
* Driver entrypoints referenced from above
*--------------------------------------------------------------------------*/
static int scc_open (struct tty_struct * tty, struct file * filp)
{
int line = tty->index;
int retval;
struct scc_port *port = &scc_ports[line];
int i, channel = port->channel;
unsigned long flags;
SCC_ACCESS_INIT(port);
#if defined(CONFIG_MVME162_SCC) || defined(CONFIG_MVME147_SCC)
static const struct {
unsigned reg, val;
} mvme_init_tab[] = {
/* Values for MVME162 and MVME147 */
/* no parity, 1 stop bit, async, 1:16 */
{ AUX1_CTRL_REG, A1CR_PARITY_NONE|A1CR_MODE_ASYNC_1|A1CR_CLKMODE_x16 },
/* parity error is special cond, ints disabled, no DMA */
{ INT_AND_DMA_REG, IDR_PARERR_AS_SPCOND | IDR_RX_INT_DISAB },
/* Rx 8 bits/char, no auto enable, Rx off */
{ RX_CTRL_REG, RCR_CHSIZE_8 },
/* DTR off, Tx 8 bits/char, RTS off, Tx off */
{ TX_CTRL_REG, TCR_CHSIZE_8 },
/* special features off */
{ AUX2_CTRL_REG, 0 },
{ CLK_CTRL_REG, CCR_RXCLK_BRG | CCR_TXCLK_BRG },
{ DPLL_CTRL_REG, DCR_BRG_ENAB | DCR_BRG_USE_PCLK },
/* Start Rx */
{ RX_CTRL_REG, RCR_RX_ENAB | RCR_CHSIZE_8 },
/* Start Tx */
{ TX_CTRL_REG, TCR_TX_ENAB | TCR_RTS | TCR_DTR | TCR_CHSIZE_8 },
/* Ext/Stat ints: DCD only */
{ INT_CTRL_REG, ICR_ENAB_DCD_INT },
/* Reset Ext/Stat ints */
{ COMMAND_REG, CR_EXTSTAT_RESET },
/* ...again */
{ COMMAND_REG, CR_EXTSTAT_RESET },
};
#endif
#if defined(CONFIG_BVME6000_SCC)
static const struct {
unsigned reg, val;
} bvme_init_tab[] = {
/* Values for BVME6000 */
/* no parity, 1 stop bit, async, 1:16 */
{ AUX1_CTRL_REG, A1CR_PARITY_NONE|A1CR_MODE_ASYNC_1|A1CR_CLKMODE_x16 },
/* parity error is special cond, ints disabled, no DMA */
{ INT_AND_DMA_REG, IDR_PARERR_AS_SPCOND | IDR_RX_INT_DISAB },
/* Rx 8 bits/char, no auto enable, Rx off */
{ RX_CTRL_REG, RCR_CHSIZE_8 },
/* DTR off, Tx 8 bits/char, RTS off, Tx off */
{ TX_CTRL_REG, TCR_CHSIZE_8 },
/* special features off */
{ AUX2_CTRL_REG, 0 },
{ CLK_CTRL_REG, CCR_RTxC_XTAL | CCR_RXCLK_BRG | CCR_TXCLK_BRG },
{ DPLL_CTRL_REG, DCR_BRG_ENAB },
/* Start Rx */
{ RX_CTRL_REG, RCR_RX_ENAB | RCR_CHSIZE_8 },
/* Start Tx */
{ TX_CTRL_REG, TCR_TX_ENAB | TCR_RTS | TCR_DTR | TCR_CHSIZE_8 },
/* Ext/Stat ints: DCD only */
{ INT_CTRL_REG, ICR_ENAB_DCD_INT },
/* Reset Ext/Stat ints */
{ COMMAND_REG, CR_EXTSTAT_RESET },
/* ...again */
{ COMMAND_REG, CR_EXTSTAT_RESET },
};
#endif
if (!(port->gs.port.flags & ASYNC_INITIALIZED)) {
local_irq_save(flags);
#if defined(CONFIG_MVME147_SCC) || defined(CONFIG_MVME162_SCC)
if (MACH_IS_MVME147 || MACH_IS_MVME16x) {
for (i = 0; i < ARRAY_SIZE(mvme_init_tab); ++i)
SCCwrite(mvme_init_tab[i].reg, mvme_init_tab[i].val);
}
#endif
#if defined(CONFIG_BVME6000_SCC)
if (MACH_IS_BVME6000) {
for (i = 0; i < ARRAY_SIZE(bvme_init_tab); ++i)
SCCwrite(bvme_init_tab[i].reg, bvme_init_tab[i].val);
}
#endif
/* remember status register for detection of DCD and CTS changes */
scc_last_status_reg[channel] = SCCread(STATUS_REG);
port->c_dcd = 0; /* Prevent initial 1->0 interrupt */
scc_setsignals (port, 1,1);
local_irq_restore(flags);
}
tty->driver_data = port;
port->gs.port.tty = tty;
port->gs.port.count++;
retval = gs_init_port(&port->gs);
if (retval) {
port->gs.port.count--;
return retval;
}
port->gs.port.flags |= GS_ACTIVE;
retval = gs_block_til_ready(port, filp);
if (retval) {
port->gs.port.count--;
return retval;
}
port->c_dcd = tty_port_carrier_raised(&port->gs.port);
scc_enable_rx_interrupts(port);
return 0;
}
static void scc_throttle (struct tty_struct * tty)
{
struct scc_port *port = tty->driver_data;
unsigned long flags;
SCC_ACCESS_INIT(port);
if (tty->termios->c_cflag & CRTSCTS) {
local_irq_save(flags);
SCCmod(TX_CTRL_REG, ~TCR_RTS, 0);
local_irq_restore(flags);
}
if (I_IXOFF(tty))
scc_send_xchar(tty, STOP_CHAR(tty));
}
static void scc_unthrottle (struct tty_struct * tty)
{
struct scc_port *port = tty->driver_data;
unsigned long flags;
SCC_ACCESS_INIT(port);
if (tty->termios->c_cflag & CRTSCTS) {
local_irq_save(flags);
SCCmod(TX_CTRL_REG, 0xff, TCR_RTS);
local_irq_restore(flags);
}
if (I_IXOFF(tty))
scc_send_xchar(tty, START_CHAR(tty));
}
static int scc_ioctl(struct tty_struct *tty, struct file *file,
unsigned int cmd, unsigned long arg)
{
return -ENOIOCTLCMD;
}
static int scc_break_ctl(struct tty_struct *tty, int break_state)
{
struct scc_port *port = tty->driver_data;
unsigned long flags;
SCC_ACCESS_INIT(port);
local_irq_save(flags);
SCCmod(TX_CTRL_REG, ~TCR_SEND_BREAK,
break_state ? TCR_SEND_BREAK : 0);
local_irq_restore(flags);
return 0;
}
/*---------------------------------------------------------------------------
* Serial console stuff...
*--------------------------------------------------------------------------*/
#define scc_delay() do { __asm__ __volatile__ (" nop; nop"); } while (0)
static void scc_ch_write (char ch)
{
volatile char *p = NULL;
#ifdef CONFIG_MVME147_SCC
if (MACH_IS_MVME147)
p = (volatile char *)M147_SCC_A_ADDR;
#endif
#ifdef CONFIG_MVME162_SCC
if (MACH_IS_MVME16x)
p = (volatile char *)MVME_SCC_A_ADDR;
#endif
#ifdef CONFIG_BVME6000_SCC
if (MACH_IS_BVME6000)
p = (volatile char *)BVME_SCC_A_ADDR;
#endif
do {
scc_delay();
}
while (!(*p & 4));
scc_delay();
*p = 8;
scc_delay();
*p = ch;
}
/* The console must be locked when we get here. */
static void scc_console_write (struct console *co, const char *str, unsigned count)
{
unsigned long flags;
local_irq_save(flags);
while (count--)
{
if (*str == '\n')
scc_ch_write ('\r');
scc_ch_write (*str++);
}
local_irq_restore(flags);
}
static struct tty_driver *scc_console_device(struct console *c, int *index)
{
*index = c->index;
return scc_driver;
}
static struct console sercons = {
.name = "ttyS",
.write = scc_console_write,
.device = scc_console_device,
.flags = CON_PRINTBUFFER,
.index = -1,
};
static int __init vme_scc_console_init(void)
{
if (vme_brdtype == VME_TYPE_MVME147 ||
vme_brdtype == VME_TYPE_MVME162 ||
vme_brdtype == VME_TYPE_MVME172 ||
vme_brdtype == VME_TYPE_BVME4000 ||
vme_brdtype == VME_TYPE_BVME6000)
register_console(&sercons);
return 0;
}
console_initcall(vme_scc_console_init);