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linux/drivers/char/serial167.c

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Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
/*
* linux/drivers/char/serial167.c
*
* Driver for MVME166/7 board serial ports, which are via a CD2401.
* Based very much on cyclades.c.
*
* MVME166/7 work by Richard Hirst [richard@sleepie.demon.co.uk]
*
* ==============================================================
*
* static char rcsid[] =
* "$Revision: 1.36.1.4 $$Date: 1995/03/29 06:14:14 $";
*
* linux/kernel/cyclades.c
*
* Maintained by Marcio Saito (cyclades@netcom.com) and
* Randolph Bentson (bentson@grieg.seaslug.org)
*
* Much of the design and some of the code came from serial.c
* which was copyright (C) 1991, 1992 Linus Torvalds. It was
* extensively rewritten by Theodore Ts'o, 8/16/92 -- 9/14/92,
* and then fixed as suggested by Michael K. Johnson 12/12/92.
*
* This version does not support shared irq's.
*
* $Log: cyclades.c,v $
* Revision 1.36.1.4 1995/03/29 06:14:14 bentson
* disambiguate between Cyclom-16Y and Cyclom-32Ye;
*
* Changes:
*
* 200 lines of changes record removed - RGH 11-10-95, starting work on
* converting this to drive serial ports on mvme166 (cd2401).
*
* Arnaldo Carvalho de Melo <acme@conectiva.com.br> - 2000/08/25
* - get rid of verify_area
* - use get_user to access memory from userspace in set_threshold,
* set_default_threshold and set_timeout
* - don't use the panic function in serial167_init
* - do resource release on failure on serial167_init
* - include missing restore_flags in mvme167_serial_console_setup
*
* Kars de Jong <jongk@linux-m68k.org> - 2004/09/06
* - replace bottom half handler with task queue handler
*/
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/tty.h>
#include <linux/interrupt.h>
#include <linux/serial.h>
#include <linux/serialP.h>
#include <linux/string.h>
#include <linux/fcntl.h>
#include <linux/ptrace.h>
#include <linux/serial167.h>
#include <linux/delay.h>
#include <linux/major.h>
#include <linux/mm.h>
#include <linux/console.h>
#include <linux/module.h>
#include <linux/bitops.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/mvme16xhw.h>
#include <asm/bootinfo.h>
#include <asm/setup.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <asm/uaccess.h>
#include <linux/init.h>
#define SERIAL_PARANOIA_CHECK
#undef SERIAL_DEBUG_OPEN
#undef SERIAL_DEBUG_THROTTLE
#undef SERIAL_DEBUG_OTHER
#undef SERIAL_DEBUG_IO
#undef SERIAL_DEBUG_COUNT
#undef SERIAL_DEBUG_DTR
#undef CYCLOM_16Y_HACK
#define CYCLOM_ENABLE_MONITORING
#define WAKEUP_CHARS 256
#define STD_COM_FLAGS (0)
#define SERIAL_TYPE_NORMAL 1
static struct tty_driver *cy_serial_driver;
extern int serial_console;
static struct cyclades_port *serial_console_info = NULL;
static unsigned int serial_console_cflag = 0;
u_char initial_console_speed;
/* Base address of cd2401 chip on mvme166/7 */
#define BASE_ADDR (0xfff45000)
#define pcc2chip ((volatile u_char *)0xfff42000)
#define PccSCCMICR 0x1d
#define PccSCCTICR 0x1e
#define PccSCCRICR 0x1f
#define PccTPIACKR 0x25
#define PccRPIACKR 0x27
#define PccIMLR 0x3f
/* This is the per-port data structure */
struct cyclades_port cy_port[] = {
/* CARD# */
{-1 }, /* ttyS0 */
{-1 }, /* ttyS1 */
{-1 }, /* ttyS2 */
{-1 }, /* ttyS3 */
};
[PATCH] drivers/char: Use ARRAY_SIZE macro Use ARRAY_SIZE macro instead of sizeof(x)/sizeof(x[0]) and remove duplicates of ARRAY_SIZE. Signed-off-by: Tobias Klauser <tklauser@nuerscht.ch> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 12:54:02 +08:00
#define NR_PORTS ARRAY_SIZE(cy_port)
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
/*
* This is used to look up the divisor speeds and the timeouts
* We're normally limited to 15 distinct baud rates. The extra
* are accessed via settings in info->flags.
* 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
* 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
* HI VHI
*/
static int baud_table[] = {
0, 50, 75, 110, 134, 150, 200, 300, 600, 1200,
1800, 2400, 4800, 9600, 19200, 38400, 57600, 76800,115200,150000,
0};
#if 0
static char baud_co[] = { /* 25 MHz clock option table */
/* value => 00 01 02 03 04 */
/* divide by 8 32 128 512 2048 */
0x00, 0x04, 0x04, 0x04, 0x04, 0x04, 0x03, 0x03, 0x03, 0x02,
0x02, 0x02, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
static char baud_bpr[] = { /* 25 MHz baud rate period table */
0x00, 0xf5, 0xa3, 0x6f, 0x5c, 0x51, 0xf5, 0xa3, 0x51, 0xa3,
0x6d, 0x51, 0xa3, 0x51, 0xa3, 0x51, 0x36, 0x29, 0x1b, 0x15};
#endif
/* I think 166 brd clocks 2401 at 20MHz.... */
/* These values are written directly to tcor, and >> 5 for writing to rcor */
static u_char baud_co[] = { /* 20 MHz clock option table */
0x00, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x60, 0x60, 0x40,
0x40, 0x40, 0x20, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
/* These values written directly to tbpr/rbpr */
static u_char baud_bpr[] = { /* 20 MHz baud rate period table */
0x00, 0xc0, 0x80, 0x58, 0x6c, 0x40, 0xc0, 0x81, 0x40, 0x81,
0x57, 0x40, 0x81, 0x40, 0x81, 0x40, 0x2b, 0x20, 0x15, 0x10};
static u_char baud_cor4[] = { /* receive threshold */
0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a,
0x0a, 0x0a, 0x0a, 0x09, 0x09, 0x08, 0x08, 0x08, 0x08, 0x07};
static void shutdown(struct cyclades_port *);
static int startup (struct cyclades_port *);
static void cy_throttle(struct tty_struct *);
static void cy_unthrottle(struct tty_struct *);
static void config_setup(struct cyclades_port *);
extern void console_print(const char *);
#ifdef CYCLOM_SHOW_STATUS
static void show_status(int);
#endif
#ifdef CONFIG_REMOTE_DEBUG
static void debug_setup(void);
void queueDebugChar (int c);
int getDebugChar(void);
#define DEBUG_PORT 1
#define DEBUG_LEN 256
typedef struct {
int in;
int out;
unsigned char buf[DEBUG_LEN];
} debugq;
debugq debugiq;
#endif
/*
* I have my own version of udelay(), as it is needed when initialising
* the chip, before the delay loop has been calibrated. Should probably
* reference one of the vmechip2 or pccchip2 counter for an accurate
* delay, but this wild guess will do for now.
*/
void my_udelay (long us)
{
u_char x;
volatile u_char *p = &x;
int i;
while (us--)
for (i = 100; i; i--)
x |= *p;
}
static inline int
serial_paranoia_check(struct cyclades_port *info, char *name,
const char *routine)
{
#ifdef SERIAL_PARANOIA_CHECK
static const char *badmagic =
"Warning: bad magic number for serial struct (%s) in %s\n";
static const char *badinfo =
"Warning: null cyclades_port for (%s) in %s\n";
static const char *badrange =
"Warning: cyclades_port out of range for (%s) in %s\n";
if (!info) {
printk(badinfo, name, routine);
return 1;
}
if( (long)info < (long)(&cy_port[0])
|| (long)(&cy_port[NR_PORTS]) < (long)info ){
printk(badrange, name, routine);
return 1;
}
if (info->magic != CYCLADES_MAGIC) {
printk(badmagic, name, routine);
return 1;
}
#endif
return 0;
} /* serial_paranoia_check */
#if 0
/* The following diagnostic routines allow the driver to spew
information on the screen, even (especially!) during interrupts.
*/
void
SP(char *data){
unsigned long flags;
local_irq_save(flags);
console_print(data);
local_irq_restore(flags);
}
char scrn[2];
void
CP(char data){
unsigned long flags;
local_irq_save(flags);
scrn[0] = data;
console_print(scrn);
local_irq_restore(flags);
}/* CP */
void CP1(int data) { (data<10)? CP(data+'0'): CP(data+'A'-10); }/* CP1 */
void CP2(int data) { CP1((data>>4) & 0x0f); CP1( data & 0x0f); }/* CP2 */
void CP4(int data) { CP2((data>>8) & 0xff); CP2(data & 0xff); }/* CP4 */
void CP8(long data) { CP4((data>>16) & 0xffff); CP4(data & 0xffff); }/* CP8 */
#endif
/* This routine waits up to 1000 micro-seconds for the previous
command to the Cirrus chip to complete and then issues the
new command. An error is returned if the previous command
didn't finish within the time limit.
*/
u_short
write_cy_cmd(volatile u_char *base_addr, u_char cmd)
{
unsigned long flags;
volatile int i;
local_irq_save(flags);
/* Check to see that the previous command has completed */
for(i = 0 ; i < 100 ; i++){
if (base_addr[CyCCR] == 0){
break;
}
my_udelay(10L);
}
/* if the CCR never cleared, the previous command
didn't finish within the "reasonable time" */
if ( i == 10 ) {
local_irq_restore(flags);
return (-1);
}
/* Issue the new command */
base_addr[CyCCR] = cmd;
local_irq_restore(flags);
return(0);
} /* write_cy_cmd */
/* cy_start and cy_stop provide software output flow control as a
function of XON/XOFF, software CTS, and other such stuff. */
static void
cy_stop(struct tty_struct *tty)
{
struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
volatile unsigned char *base_addr = (unsigned char *)BASE_ADDR;
int channel;
unsigned long flags;
#ifdef SERIAL_DEBUG_OTHER
printk("cy_stop %s\n", tty->name); /* */
#endif
if (serial_paranoia_check(info, tty->name, "cy_stop"))
return;
channel = info->line;
local_irq_save(flags);
base_addr[CyCAR] = (u_char)(channel); /* index channel */
base_addr[CyIER] &= ~(CyTxMpty|CyTxRdy);
local_irq_restore(flags);
return;
} /* cy_stop */
static void
cy_start(struct tty_struct *tty)
{
struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
volatile unsigned char *base_addr = (unsigned char *)BASE_ADDR;
int channel;
unsigned long flags;
#ifdef SERIAL_DEBUG_OTHER
printk("cy_start %s\n", tty->name); /* */
#endif
if (serial_paranoia_check(info, tty->name, "cy_start"))
return;
channel = info->line;
local_irq_save(flags);
base_addr[CyCAR] = (u_char)(channel);
base_addr[CyIER] |= CyTxMpty;
local_irq_restore(flags);
return;
} /* cy_start */
/*
* This routine is used by the interrupt handler to schedule
* processing in the software interrupt portion of the driver
* (also known as the "bottom half"). This can be called any
* number of times for any channel without harm.
*/
static inline void
cy_sched_event(struct cyclades_port *info, int event)
{
info->event |= 1 << event; /* remember what kind of event and who */
schedule_work(&info->tqueue);
} /* cy_sched_event */
/* The real interrupt service routines are called
whenever the card wants its hand held--chars
received, out buffer empty, modem change, etc.
*/
static irqreturn_t
IRQ: Maintain regs pointer globally rather than passing to IRQ handlers Maintain a per-CPU global "struct pt_regs *" variable which can be used instead of passing regs around manually through all ~1800 interrupt handlers in the Linux kernel. The regs pointer is used in few places, but it potentially costs both stack space and code to pass it around. On the FRV arch, removing the regs parameter from all the genirq function results in a 20% speed up of the IRQ exit path (ie: from leaving timer_interrupt() to leaving do_IRQ()). Where appropriate, an arch may override the generic storage facility and do something different with the variable. On FRV, for instance, the address is maintained in GR28 at all times inside the kernel as part of general exception handling. Having looked over the code, it appears that the parameter may be handed down through up to twenty or so layers of functions. Consider a USB character device attached to a USB hub, attached to a USB controller that posts its interrupts through a cascaded auxiliary interrupt controller. A character device driver may want to pass regs to the sysrq handler through the input layer which adds another few layers of parameter passing. I've build this code with allyesconfig for x86_64 and i386. I've runtested the main part of the code on FRV and i386, though I can't test most of the drivers. I've also done partial conversion for powerpc and MIPS - these at least compile with minimal configurations. This will affect all archs. Mostly the changes should be relatively easy. Take do_IRQ(), store the regs pointer at the beginning, saving the old one: struct pt_regs *old_regs = set_irq_regs(regs); And put the old one back at the end: set_irq_regs(old_regs); Don't pass regs through to generic_handle_irq() or __do_IRQ(). In timer_interrupt(), this sort of change will be necessary: - update_process_times(user_mode(regs)); - profile_tick(CPU_PROFILING, regs); + update_process_times(user_mode(get_irq_regs())); + profile_tick(CPU_PROFILING); I'd like to move update_process_times()'s use of get_irq_regs() into itself, except that i386, alone of the archs, uses something other than user_mode(). Some notes on the interrupt handling in the drivers: (*) input_dev() is now gone entirely. The regs pointer is no longer stored in the input_dev struct. (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does something different depending on whether it's been supplied with a regs pointer or not. (*) Various IRQ handler function pointers have been moved to type irq_handler_t. Signed-Off-By: David Howells <dhowells@redhat.com> (cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 21:55:46 +08:00
cd2401_rxerr_interrupt(int irq, void *dev_id)
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
{
struct tty_struct *tty;
struct cyclades_port *info;
volatile unsigned char *base_addr = (unsigned char *)BASE_ADDR;
unsigned char err, rfoc;
int channel;
char data;
/* determine the channel and change to that context */
channel = (u_short ) (base_addr[CyLICR] >> 2);
info = &cy_port[channel];
info->last_active = jiffies;
if ((err = base_addr[CyRISR]) & CyTIMEOUT) {
/* This is a receive timeout interrupt, ignore it */
base_addr[CyREOIR] = CyNOTRANS;
return IRQ_HANDLED;
}
/* Read a byte of data if there is any - assume the error
* is associated with this character */
if ((rfoc = base_addr[CyRFOC]) != 0)
data = base_addr[CyRDR];
else
data = 0;
/* if there is nowhere to put the data, discard it */
if(info->tty == 0) {
base_addr[CyREOIR] = rfoc ? 0 : CyNOTRANS;
return IRQ_HANDLED;
}
else { /* there is an open port for this data */
tty = info->tty;
if(err & info->ignore_status_mask){
base_addr[CyREOIR] = rfoc ? 0 : CyNOTRANS;
return IRQ_HANDLED;
}
[PATCH] TTY layer buffering revamp The API and code have been through various bits of initial review by serial driver people but they definitely need to live somewhere for a while so the unconverted drivers can get knocked into shape, existing drivers that have been updated can be better tuned and bugs whacked out. This replaces the tty flip buffers with kmalloc objects in rings. In the normal situation for an IRQ driven serial port at typical speeds the behaviour is pretty much the same, two buffers end up allocated and the kernel cycles between them as before. When there are delays or at high speed we now behave far better as the buffer pool can grow a bit rather than lose characters. This also means that we can operate at higher speeds reliably. For drivers that receive characters in blocks (DMA based, USB and especially virtualisation) the layer allows a lot of driver specific code that works around the tty layer with private secondary queues to be removed. The IBM folks need this sort of layer, the smart serial port people do, the virtualisers do (because a virtualised tty typically operates at infinite speed rather than emulating 9600 baud). Finally many drivers had invalid and unsafe attempts to avoid buffer overflows by directly invoking tty methods extracted out of the innards of work queue structs. These are no longer needed and all go away. That fixes various random hangs with serial ports on overflow. The other change in here is to optimise the receive_room path that is used by some callers. It turns out that only one ldisc uses receive room except asa constant and it updates it far far less than the value is read. We thus make it a variable not a function call. I expect the code to contain bugs due to the size alone but I'll be watching and squashing them and feeding out new patches as it goes. Because the buffers now dynamically expand you should only run out of buffering when the kernel runs out of memory for real. That means a lot of the horrible hacks high performance drivers used to do just aren't needed any more. Description: tty_insert_flip_char is an old API and continues to work as before, as does tty_flip_buffer_push() [this is why many drivers dont need modification]. It does now also return the number of chars inserted There are also tty_buffer_request_room(tty, len) which asks for a buffer block of the length requested and returns the space found. This improves efficiency with hardware that knows how much to transfer. and tty_insert_flip_string_flags(tty, str, flags, len) to insert a string of characters and flags For a smart interface the usual code is len = tty_request_buffer_room(tty, amount_hardware_says); tty_insert_flip_string(tty, buffer_from_card, len); More description! At the moment tty buffers are attached directly to the tty. This is causing a lot of the problems related to tty layer locking, also problems at high speed and also with bursty data (such as occurs in virtualised environments) I'm working on ripping out the flip buffers and replacing them with a pool of dynamically allocated buffers. This allows both for old style "byte I/O" devices and also helps virtualisation and smart devices where large blocks of data suddenely materialise and need storing. So far so good. Lots of drivers reference tty->flip.*. Several of them also call directly and unsafely into function pointers it provides. This will all break. Most drivers can use tty_insert_flip_char which can be kept as an API but others need more. At the moment I've added the following interfaces, if people think more will be needed now is a good time to say int tty_buffer_request_room(tty, size) Try and ensure at least size bytes are available, returns actual room (may be zero). At the moment it just uses the flipbuf space but that will change. Repeated calls without characters being added are not cumulative. (ie if you call it with 1, 1, 1, and then 4 you'll have four characters of space. The other functions will also try and grow buffers in future but this will be a more efficient way when you know block sizes. int tty_insert_flip_char(tty, ch, flag) As before insert a character if there is room. Now returns 1 for success, 0 for failure. int tty_insert_flip_string(tty, str, len) Insert a block of non error characters. Returns the number inserted. int tty_prepare_flip_string(tty, strptr, len) Adjust the buffer to allow len characters to be added. Returns a buffer pointer in strptr and the length available. This allows for hardware that needs to use functions like insl or mencpy_fromio. Signed-off-by: Alan Cox <alan@redhat.com> Cc: Paul Fulghum <paulkf@microgate.com> Signed-off-by: Hirokazu Takata <takata@linux-m32r.org> Signed-off-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: John Hawkes <hawkes@sgi.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 12:54:13 +08:00
if (tty_buffer_request_room(tty, 1) != 0){
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
if (err & info->read_status_mask){
if(err & CyBREAK){
[PATCH] TTY layer buffering revamp The API and code have been through various bits of initial review by serial driver people but they definitely need to live somewhere for a while so the unconverted drivers can get knocked into shape, existing drivers that have been updated can be better tuned and bugs whacked out. This replaces the tty flip buffers with kmalloc objects in rings. In the normal situation for an IRQ driven serial port at typical speeds the behaviour is pretty much the same, two buffers end up allocated and the kernel cycles between them as before. When there are delays or at high speed we now behave far better as the buffer pool can grow a bit rather than lose characters. This also means that we can operate at higher speeds reliably. For drivers that receive characters in blocks (DMA based, USB and especially virtualisation) the layer allows a lot of driver specific code that works around the tty layer with private secondary queues to be removed. The IBM folks need this sort of layer, the smart serial port people do, the virtualisers do (because a virtualised tty typically operates at infinite speed rather than emulating 9600 baud). Finally many drivers had invalid and unsafe attempts to avoid buffer overflows by directly invoking tty methods extracted out of the innards of work queue structs. These are no longer needed and all go away. That fixes various random hangs with serial ports on overflow. The other change in here is to optimise the receive_room path that is used by some callers. It turns out that only one ldisc uses receive room except asa constant and it updates it far far less than the value is read. We thus make it a variable not a function call. I expect the code to contain bugs due to the size alone but I'll be watching and squashing them and feeding out new patches as it goes. Because the buffers now dynamically expand you should only run out of buffering when the kernel runs out of memory for real. That means a lot of the horrible hacks high performance drivers used to do just aren't needed any more. Description: tty_insert_flip_char is an old API and continues to work as before, as does tty_flip_buffer_push() [this is why many drivers dont need modification]. It does now also return the number of chars inserted There are also tty_buffer_request_room(tty, len) which asks for a buffer block of the length requested and returns the space found. This improves efficiency with hardware that knows how much to transfer. and tty_insert_flip_string_flags(tty, str, flags, len) to insert a string of characters and flags For a smart interface the usual code is len = tty_request_buffer_room(tty, amount_hardware_says); tty_insert_flip_string(tty, buffer_from_card, len); More description! At the moment tty buffers are attached directly to the tty. This is causing a lot of the problems related to tty layer locking, also problems at high speed and also with bursty data (such as occurs in virtualised environments) I'm working on ripping out the flip buffers and replacing them with a pool of dynamically allocated buffers. This allows both for old style "byte I/O" devices and also helps virtualisation and smart devices where large blocks of data suddenely materialise and need storing. So far so good. Lots of drivers reference tty->flip.*. Several of them also call directly and unsafely into function pointers it provides. This will all break. Most drivers can use tty_insert_flip_char which can be kept as an API but others need more. At the moment I've added the following interfaces, if people think more will be needed now is a good time to say int tty_buffer_request_room(tty, size) Try and ensure at least size bytes are available, returns actual room (may be zero). At the moment it just uses the flipbuf space but that will change. Repeated calls without characters being added are not cumulative. (ie if you call it with 1, 1, 1, and then 4 you'll have four characters of space. The other functions will also try and grow buffers in future but this will be a more efficient way when you know block sizes. int tty_insert_flip_char(tty, ch, flag) As before insert a character if there is room. Now returns 1 for success, 0 for failure. int tty_insert_flip_string(tty, str, len) Insert a block of non error characters. Returns the number inserted. int tty_prepare_flip_string(tty, strptr, len) Adjust the buffer to allow len characters to be added. Returns a buffer pointer in strptr and the length available. This allows for hardware that needs to use functions like insl or mencpy_fromio. Signed-off-by: Alan Cox <alan@redhat.com> Cc: Paul Fulghum <paulkf@microgate.com> Signed-off-by: Hirokazu Takata <takata@linux-m32r.org> Signed-off-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: John Hawkes <hawkes@sgi.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 12:54:13 +08:00
tty_insert_flip_char(tty, data, TTY_BREAK);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
if (info->flags & ASYNC_SAK){
do_SAK(tty);
}
}else if(err & CyFRAME){
[PATCH] TTY layer buffering revamp The API and code have been through various bits of initial review by serial driver people but they definitely need to live somewhere for a while so the unconverted drivers can get knocked into shape, existing drivers that have been updated can be better tuned and bugs whacked out. This replaces the tty flip buffers with kmalloc objects in rings. In the normal situation for an IRQ driven serial port at typical speeds the behaviour is pretty much the same, two buffers end up allocated and the kernel cycles between them as before. When there are delays or at high speed we now behave far better as the buffer pool can grow a bit rather than lose characters. This also means that we can operate at higher speeds reliably. For drivers that receive characters in blocks (DMA based, USB and especially virtualisation) the layer allows a lot of driver specific code that works around the tty layer with private secondary queues to be removed. The IBM folks need this sort of layer, the smart serial port people do, the virtualisers do (because a virtualised tty typically operates at infinite speed rather than emulating 9600 baud). Finally many drivers had invalid and unsafe attempts to avoid buffer overflows by directly invoking tty methods extracted out of the innards of work queue structs. These are no longer needed and all go away. That fixes various random hangs with serial ports on overflow. The other change in here is to optimise the receive_room path that is used by some callers. It turns out that only one ldisc uses receive room except asa constant and it updates it far far less than the value is read. We thus make it a variable not a function call. I expect the code to contain bugs due to the size alone but I'll be watching and squashing them and feeding out new patches as it goes. Because the buffers now dynamically expand you should only run out of buffering when the kernel runs out of memory for real. That means a lot of the horrible hacks high performance drivers used to do just aren't needed any more. Description: tty_insert_flip_char is an old API and continues to work as before, as does tty_flip_buffer_push() [this is why many drivers dont need modification]. It does now also return the number of chars inserted There are also tty_buffer_request_room(tty, len) which asks for a buffer block of the length requested and returns the space found. This improves efficiency with hardware that knows how much to transfer. and tty_insert_flip_string_flags(tty, str, flags, len) to insert a string of characters and flags For a smart interface the usual code is len = tty_request_buffer_room(tty, amount_hardware_says); tty_insert_flip_string(tty, buffer_from_card, len); More description! At the moment tty buffers are attached directly to the tty. This is causing a lot of the problems related to tty layer locking, also problems at high speed and also with bursty data (such as occurs in virtualised environments) I'm working on ripping out the flip buffers and replacing them with a pool of dynamically allocated buffers. This allows both for old style "byte I/O" devices and also helps virtualisation and smart devices where large blocks of data suddenely materialise and need storing. So far so good. Lots of drivers reference tty->flip.*. Several of them also call directly and unsafely into function pointers it provides. This will all break. Most drivers can use tty_insert_flip_char which can be kept as an API but others need more. At the moment I've added the following interfaces, if people think more will be needed now is a good time to say int tty_buffer_request_room(tty, size) Try and ensure at least size bytes are available, returns actual room (may be zero). At the moment it just uses the flipbuf space but that will change. Repeated calls without characters being added are not cumulative. (ie if you call it with 1, 1, 1, and then 4 you'll have four characters of space. The other functions will also try and grow buffers in future but this will be a more efficient way when you know block sizes. int tty_insert_flip_char(tty, ch, flag) As before insert a character if there is room. Now returns 1 for success, 0 for failure. int tty_insert_flip_string(tty, str, len) Insert a block of non error characters. Returns the number inserted. int tty_prepare_flip_string(tty, strptr, len) Adjust the buffer to allow len characters to be added. Returns a buffer pointer in strptr and the length available. This allows for hardware that needs to use functions like insl or mencpy_fromio. Signed-off-by: Alan Cox <alan@redhat.com> Cc: Paul Fulghum <paulkf@microgate.com> Signed-off-by: Hirokazu Takata <takata@linux-m32r.org> Signed-off-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: John Hawkes <hawkes@sgi.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 12:54:13 +08:00
tty_insert_flip_char(tty, data, TTY_FRAME);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
}else if(err & CyPARITY){
[PATCH] TTY layer buffering revamp The API and code have been through various bits of initial review by serial driver people but they definitely need to live somewhere for a while so the unconverted drivers can get knocked into shape, existing drivers that have been updated can be better tuned and bugs whacked out. This replaces the tty flip buffers with kmalloc objects in rings. In the normal situation for an IRQ driven serial port at typical speeds the behaviour is pretty much the same, two buffers end up allocated and the kernel cycles between them as before. When there are delays or at high speed we now behave far better as the buffer pool can grow a bit rather than lose characters. This also means that we can operate at higher speeds reliably. For drivers that receive characters in blocks (DMA based, USB and especially virtualisation) the layer allows a lot of driver specific code that works around the tty layer with private secondary queues to be removed. The IBM folks need this sort of layer, the smart serial port people do, the virtualisers do (because a virtualised tty typically operates at infinite speed rather than emulating 9600 baud). Finally many drivers had invalid and unsafe attempts to avoid buffer overflows by directly invoking tty methods extracted out of the innards of work queue structs. These are no longer needed and all go away. That fixes various random hangs with serial ports on overflow. The other change in here is to optimise the receive_room path that is used by some callers. It turns out that only one ldisc uses receive room except asa constant and it updates it far far less than the value is read. We thus make it a variable not a function call. I expect the code to contain bugs due to the size alone but I'll be watching and squashing them and feeding out new patches as it goes. Because the buffers now dynamically expand you should only run out of buffering when the kernel runs out of memory for real. That means a lot of the horrible hacks high performance drivers used to do just aren't needed any more. Description: tty_insert_flip_char is an old API and continues to work as before, as does tty_flip_buffer_push() [this is why many drivers dont need modification]. It does now also return the number of chars inserted There are also tty_buffer_request_room(tty, len) which asks for a buffer block of the length requested and returns the space found. This improves efficiency with hardware that knows how much to transfer. and tty_insert_flip_string_flags(tty, str, flags, len) to insert a string of characters and flags For a smart interface the usual code is len = tty_request_buffer_room(tty, amount_hardware_says); tty_insert_flip_string(tty, buffer_from_card, len); More description! At the moment tty buffers are attached directly to the tty. This is causing a lot of the problems related to tty layer locking, also problems at high speed and also with bursty data (such as occurs in virtualised environments) I'm working on ripping out the flip buffers and replacing them with a pool of dynamically allocated buffers. This allows both for old style "byte I/O" devices and also helps virtualisation and smart devices where large blocks of data suddenely materialise and need storing. So far so good. Lots of drivers reference tty->flip.*. Several of them also call directly and unsafely into function pointers it provides. This will all break. Most drivers can use tty_insert_flip_char which can be kept as an API but others need more. At the moment I've added the following interfaces, if people think more will be needed now is a good time to say int tty_buffer_request_room(tty, size) Try and ensure at least size bytes are available, returns actual room (may be zero). At the moment it just uses the flipbuf space but that will change. Repeated calls without characters being added are not cumulative. (ie if you call it with 1, 1, 1, and then 4 you'll have four characters of space. The other functions will also try and grow buffers in future but this will be a more efficient way when you know block sizes. int tty_insert_flip_char(tty, ch, flag) As before insert a character if there is room. Now returns 1 for success, 0 for failure. int tty_insert_flip_string(tty, str, len) Insert a block of non error characters. Returns the number inserted. int tty_prepare_flip_string(tty, strptr, len) Adjust the buffer to allow len characters to be added. Returns a buffer pointer in strptr and the length available. This allows for hardware that needs to use functions like insl or mencpy_fromio. Signed-off-by: Alan Cox <alan@redhat.com> Cc: Paul Fulghum <paulkf@microgate.com> Signed-off-by: Hirokazu Takata <takata@linux-m32r.org> Signed-off-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: John Hawkes <hawkes@sgi.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 12:54:13 +08:00
tty_insert_flip_char(tty, data, TTY_PARITY);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
}else if(err & CyOVERRUN){
[PATCH] TTY layer buffering revamp The API and code have been through various bits of initial review by serial driver people but they definitely need to live somewhere for a while so the unconverted drivers can get knocked into shape, existing drivers that have been updated can be better tuned and bugs whacked out. This replaces the tty flip buffers with kmalloc objects in rings. In the normal situation for an IRQ driven serial port at typical speeds the behaviour is pretty much the same, two buffers end up allocated and the kernel cycles between them as before. When there are delays or at high speed we now behave far better as the buffer pool can grow a bit rather than lose characters. This also means that we can operate at higher speeds reliably. For drivers that receive characters in blocks (DMA based, USB and especially virtualisation) the layer allows a lot of driver specific code that works around the tty layer with private secondary queues to be removed. The IBM folks need this sort of layer, the smart serial port people do, the virtualisers do (because a virtualised tty typically operates at infinite speed rather than emulating 9600 baud). Finally many drivers had invalid and unsafe attempts to avoid buffer overflows by directly invoking tty methods extracted out of the innards of work queue structs. These are no longer needed and all go away. That fixes various random hangs with serial ports on overflow. The other change in here is to optimise the receive_room path that is used by some callers. It turns out that only one ldisc uses receive room except asa constant and it updates it far far less than the value is read. We thus make it a variable not a function call. I expect the code to contain bugs due to the size alone but I'll be watching and squashing them and feeding out new patches as it goes. Because the buffers now dynamically expand you should only run out of buffering when the kernel runs out of memory for real. That means a lot of the horrible hacks high performance drivers used to do just aren't needed any more. Description: tty_insert_flip_char is an old API and continues to work as before, as does tty_flip_buffer_push() [this is why many drivers dont need modification]. It does now also return the number of chars inserted There are also tty_buffer_request_room(tty, len) which asks for a buffer block of the length requested and returns the space found. This improves efficiency with hardware that knows how much to transfer. and tty_insert_flip_string_flags(tty, str, flags, len) to insert a string of characters and flags For a smart interface the usual code is len = tty_request_buffer_room(tty, amount_hardware_says); tty_insert_flip_string(tty, buffer_from_card, len); More description! At the moment tty buffers are attached directly to the tty. This is causing a lot of the problems related to tty layer locking, also problems at high speed and also with bursty data (such as occurs in virtualised environments) I'm working on ripping out the flip buffers and replacing them with a pool of dynamically allocated buffers. This allows both for old style "byte I/O" devices and also helps virtualisation and smart devices where large blocks of data suddenely materialise and need storing. So far so good. Lots of drivers reference tty->flip.*. Several of them also call directly and unsafely into function pointers it provides. This will all break. Most drivers can use tty_insert_flip_char which can be kept as an API but others need more. At the moment I've added the following interfaces, if people think more will be needed now is a good time to say int tty_buffer_request_room(tty, size) Try and ensure at least size bytes are available, returns actual room (may be zero). At the moment it just uses the flipbuf space but that will change. Repeated calls without characters being added are not cumulative. (ie if you call it with 1, 1, 1, and then 4 you'll have four characters of space. The other functions will also try and grow buffers in future but this will be a more efficient way when you know block sizes. int tty_insert_flip_char(tty, ch, flag) As before insert a character if there is room. Now returns 1 for success, 0 for failure. int tty_insert_flip_string(tty, str, len) Insert a block of non error characters. Returns the number inserted. int tty_prepare_flip_string(tty, strptr, len) Adjust the buffer to allow len characters to be added. Returns a buffer pointer in strptr and the length available. This allows for hardware that needs to use functions like insl or mencpy_fromio. Signed-off-by: Alan Cox <alan@redhat.com> Cc: Paul Fulghum <paulkf@microgate.com> Signed-off-by: Hirokazu Takata <takata@linux-m32r.org> Signed-off-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: John Hawkes <hawkes@sgi.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 12:54:13 +08:00
tty_insert_flip_char(tty, 0, TTY_OVERRUN);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
/*
If the flip buffer itself is
overflowing, we still loose
the next incoming character.
*/
[PATCH] TTY layer buffering revamp The API and code have been through various bits of initial review by serial driver people but they definitely need to live somewhere for a while so the unconverted drivers can get knocked into shape, existing drivers that have been updated can be better tuned and bugs whacked out. This replaces the tty flip buffers with kmalloc objects in rings. In the normal situation for an IRQ driven serial port at typical speeds the behaviour is pretty much the same, two buffers end up allocated and the kernel cycles between them as before. When there are delays or at high speed we now behave far better as the buffer pool can grow a bit rather than lose characters. This also means that we can operate at higher speeds reliably. For drivers that receive characters in blocks (DMA based, USB and especially virtualisation) the layer allows a lot of driver specific code that works around the tty layer with private secondary queues to be removed. The IBM folks need this sort of layer, the smart serial port people do, the virtualisers do (because a virtualised tty typically operates at infinite speed rather than emulating 9600 baud). Finally many drivers had invalid and unsafe attempts to avoid buffer overflows by directly invoking tty methods extracted out of the innards of work queue structs. These are no longer needed and all go away. That fixes various random hangs with serial ports on overflow. The other change in here is to optimise the receive_room path that is used by some callers. It turns out that only one ldisc uses receive room except asa constant and it updates it far far less than the value is read. We thus make it a variable not a function call. I expect the code to contain bugs due to the size alone but I'll be watching and squashing them and feeding out new patches as it goes. Because the buffers now dynamically expand you should only run out of buffering when the kernel runs out of memory for real. That means a lot of the horrible hacks high performance drivers used to do just aren't needed any more. Description: tty_insert_flip_char is an old API and continues to work as before, as does tty_flip_buffer_push() [this is why many drivers dont need modification]. It does now also return the number of chars inserted There are also tty_buffer_request_room(tty, len) which asks for a buffer block of the length requested and returns the space found. This improves efficiency with hardware that knows how much to transfer. and tty_insert_flip_string_flags(tty, str, flags, len) to insert a string of characters and flags For a smart interface the usual code is len = tty_request_buffer_room(tty, amount_hardware_says); tty_insert_flip_string(tty, buffer_from_card, len); More description! At the moment tty buffers are attached directly to the tty. This is causing a lot of the problems related to tty layer locking, also problems at high speed and also with bursty data (such as occurs in virtualised environments) I'm working on ripping out the flip buffers and replacing them with a pool of dynamically allocated buffers. This allows both for old style "byte I/O" devices and also helps virtualisation and smart devices where large blocks of data suddenely materialise and need storing. So far so good. Lots of drivers reference tty->flip.*. Several of them also call directly and unsafely into function pointers it provides. This will all break. Most drivers can use tty_insert_flip_char which can be kept as an API but others need more. At the moment I've added the following interfaces, if people think more will be needed now is a good time to say int tty_buffer_request_room(tty, size) Try and ensure at least size bytes are available, returns actual room (may be zero). At the moment it just uses the flipbuf space but that will change. Repeated calls without characters being added are not cumulative. (ie if you call it with 1, 1, 1, and then 4 you'll have four characters of space. The other functions will also try and grow buffers in future but this will be a more efficient way when you know block sizes. int tty_insert_flip_char(tty, ch, flag) As before insert a character if there is room. Now returns 1 for success, 0 for failure. int tty_insert_flip_string(tty, str, len) Insert a block of non error characters. Returns the number inserted. int tty_prepare_flip_string(tty, strptr, len) Adjust the buffer to allow len characters to be added. Returns a buffer pointer in strptr and the length available. This allows for hardware that needs to use functions like insl or mencpy_fromio. Signed-off-by: Alan Cox <alan@redhat.com> Cc: Paul Fulghum <paulkf@microgate.com> Signed-off-by: Hirokazu Takata <takata@linux-m32r.org> Signed-off-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: John Hawkes <hawkes@sgi.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 12:54:13 +08:00
tty_insert_flip_char(tty, data, TTY_NORMAL);
}
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
/* These two conditions may imply */
/* a normal read should be done. */
/* else if(data & CyTIMEOUT) */
/* else if(data & CySPECHAR) */
}else{
[PATCH] TTY layer buffering revamp The API and code have been through various bits of initial review by serial driver people but they definitely need to live somewhere for a while so the unconverted drivers can get knocked into shape, existing drivers that have been updated can be better tuned and bugs whacked out. This replaces the tty flip buffers with kmalloc objects in rings. In the normal situation for an IRQ driven serial port at typical speeds the behaviour is pretty much the same, two buffers end up allocated and the kernel cycles between them as before. When there are delays or at high speed we now behave far better as the buffer pool can grow a bit rather than lose characters. This also means that we can operate at higher speeds reliably. For drivers that receive characters in blocks (DMA based, USB and especially virtualisation) the layer allows a lot of driver specific code that works around the tty layer with private secondary queues to be removed. The IBM folks need this sort of layer, the smart serial port people do, the virtualisers do (because a virtualised tty typically operates at infinite speed rather than emulating 9600 baud). Finally many drivers had invalid and unsafe attempts to avoid buffer overflows by directly invoking tty methods extracted out of the innards of work queue structs. These are no longer needed and all go away. That fixes various random hangs with serial ports on overflow. The other change in here is to optimise the receive_room path that is used by some callers. It turns out that only one ldisc uses receive room except asa constant and it updates it far far less than the value is read. We thus make it a variable not a function call. I expect the code to contain bugs due to the size alone but I'll be watching and squashing them and feeding out new patches as it goes. Because the buffers now dynamically expand you should only run out of buffering when the kernel runs out of memory for real. That means a lot of the horrible hacks high performance drivers used to do just aren't needed any more. Description: tty_insert_flip_char is an old API and continues to work as before, as does tty_flip_buffer_push() [this is why many drivers dont need modification]. It does now also return the number of chars inserted There are also tty_buffer_request_room(tty, len) which asks for a buffer block of the length requested and returns the space found. This improves efficiency with hardware that knows how much to transfer. and tty_insert_flip_string_flags(tty, str, flags, len) to insert a string of characters and flags For a smart interface the usual code is len = tty_request_buffer_room(tty, amount_hardware_says); tty_insert_flip_string(tty, buffer_from_card, len); More description! At the moment tty buffers are attached directly to the tty. This is causing a lot of the problems related to tty layer locking, also problems at high speed and also with bursty data (such as occurs in virtualised environments) I'm working on ripping out the flip buffers and replacing them with a pool of dynamically allocated buffers. This allows both for old style "byte I/O" devices and also helps virtualisation and smart devices where large blocks of data suddenely materialise and need storing. So far so good. Lots of drivers reference tty->flip.*. Several of them also call directly and unsafely into function pointers it provides. This will all break. Most drivers can use tty_insert_flip_char which can be kept as an API but others need more. At the moment I've added the following interfaces, if people think more will be needed now is a good time to say int tty_buffer_request_room(tty, size) Try and ensure at least size bytes are available, returns actual room (may be zero). At the moment it just uses the flipbuf space but that will change. Repeated calls without characters being added are not cumulative. (ie if you call it with 1, 1, 1, and then 4 you'll have four characters of space. The other functions will also try and grow buffers in future but this will be a more efficient way when you know block sizes. int tty_insert_flip_char(tty, ch, flag) As before insert a character if there is room. Now returns 1 for success, 0 for failure. int tty_insert_flip_string(tty, str, len) Insert a block of non error characters. Returns the number inserted. int tty_prepare_flip_string(tty, strptr, len) Adjust the buffer to allow len characters to be added. Returns a buffer pointer in strptr and the length available. This allows for hardware that needs to use functions like insl or mencpy_fromio. Signed-off-by: Alan Cox <alan@redhat.com> Cc: Paul Fulghum <paulkf@microgate.com> Signed-off-by: Hirokazu Takata <takata@linux-m32r.org> Signed-off-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: John Hawkes <hawkes@sgi.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 12:54:13 +08:00
tty_insert_flip_char(tty, 0, TTY_NORMAL);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
}
}else{
[PATCH] TTY layer buffering revamp The API and code have been through various bits of initial review by serial driver people but they definitely need to live somewhere for a while so the unconverted drivers can get knocked into shape, existing drivers that have been updated can be better tuned and bugs whacked out. This replaces the tty flip buffers with kmalloc objects in rings. In the normal situation for an IRQ driven serial port at typical speeds the behaviour is pretty much the same, two buffers end up allocated and the kernel cycles between them as before. When there are delays or at high speed we now behave far better as the buffer pool can grow a bit rather than lose characters. This also means that we can operate at higher speeds reliably. For drivers that receive characters in blocks (DMA based, USB and especially virtualisation) the layer allows a lot of driver specific code that works around the tty layer with private secondary queues to be removed. The IBM folks need this sort of layer, the smart serial port people do, the virtualisers do (because a virtualised tty typically operates at infinite speed rather than emulating 9600 baud). Finally many drivers had invalid and unsafe attempts to avoid buffer overflows by directly invoking tty methods extracted out of the innards of work queue structs. These are no longer needed and all go away. That fixes various random hangs with serial ports on overflow. The other change in here is to optimise the receive_room path that is used by some callers. It turns out that only one ldisc uses receive room except asa constant and it updates it far far less than the value is read. We thus make it a variable not a function call. I expect the code to contain bugs due to the size alone but I'll be watching and squashing them and feeding out new patches as it goes. Because the buffers now dynamically expand you should only run out of buffering when the kernel runs out of memory for real. That means a lot of the horrible hacks high performance drivers used to do just aren't needed any more. Description: tty_insert_flip_char is an old API and continues to work as before, as does tty_flip_buffer_push() [this is why many drivers dont need modification]. It does now also return the number of chars inserted There are also tty_buffer_request_room(tty, len) which asks for a buffer block of the length requested and returns the space found. This improves efficiency with hardware that knows how much to transfer. and tty_insert_flip_string_flags(tty, str, flags, len) to insert a string of characters and flags For a smart interface the usual code is len = tty_request_buffer_room(tty, amount_hardware_says); tty_insert_flip_string(tty, buffer_from_card, len); More description! At the moment tty buffers are attached directly to the tty. This is causing a lot of the problems related to tty layer locking, also problems at high speed and also with bursty data (such as occurs in virtualised environments) I'm working on ripping out the flip buffers and replacing them with a pool of dynamically allocated buffers. This allows both for old style "byte I/O" devices and also helps virtualisation and smart devices where large blocks of data suddenely materialise and need storing. So far so good. Lots of drivers reference tty->flip.*. Several of them also call directly and unsafely into function pointers it provides. This will all break. Most drivers can use tty_insert_flip_char which can be kept as an API but others need more. At the moment I've added the following interfaces, if people think more will be needed now is a good time to say int tty_buffer_request_room(tty, size) Try and ensure at least size bytes are available, returns actual room (may be zero). At the moment it just uses the flipbuf space but that will change. Repeated calls without characters being added are not cumulative. (ie if you call it with 1, 1, 1, and then 4 you'll have four characters of space. The other functions will also try and grow buffers in future but this will be a more efficient way when you know block sizes. int tty_insert_flip_char(tty, ch, flag) As before insert a character if there is room. Now returns 1 for success, 0 for failure. int tty_insert_flip_string(tty, str, len) Insert a block of non error characters. Returns the number inserted. int tty_prepare_flip_string(tty, strptr, len) Adjust the buffer to allow len characters to be added. Returns a buffer pointer in strptr and the length available. This allows for hardware that needs to use functions like insl or mencpy_fromio. Signed-off-by: Alan Cox <alan@redhat.com> Cc: Paul Fulghum <paulkf@microgate.com> Signed-off-by: Hirokazu Takata <takata@linux-m32r.org> Signed-off-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: John Hawkes <hawkes@sgi.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 12:54:13 +08:00
tty_insert_flip_char(tty, data, TTY_NORMAL);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
}
}else{
/* there was a software buffer overrun
and nothing could be done about it!!! */
}
}
schedule_delayed_work(&tty->flip.work, 1);
/* end of service */
base_addr[CyREOIR] = rfoc ? 0 : CyNOTRANS;
return IRQ_HANDLED;
} /* cy_rxerr_interrupt */
static irqreturn_t
IRQ: Maintain regs pointer globally rather than passing to IRQ handlers Maintain a per-CPU global "struct pt_regs *" variable which can be used instead of passing regs around manually through all ~1800 interrupt handlers in the Linux kernel. The regs pointer is used in few places, but it potentially costs both stack space and code to pass it around. On the FRV arch, removing the regs parameter from all the genirq function results in a 20% speed up of the IRQ exit path (ie: from leaving timer_interrupt() to leaving do_IRQ()). Where appropriate, an arch may override the generic storage facility and do something different with the variable. On FRV, for instance, the address is maintained in GR28 at all times inside the kernel as part of general exception handling. Having looked over the code, it appears that the parameter may be handed down through up to twenty or so layers of functions. Consider a USB character device attached to a USB hub, attached to a USB controller that posts its interrupts through a cascaded auxiliary interrupt controller. A character device driver may want to pass regs to the sysrq handler through the input layer which adds another few layers of parameter passing. I've build this code with allyesconfig for x86_64 and i386. I've runtested the main part of the code on FRV and i386, though I can't test most of the drivers. I've also done partial conversion for powerpc and MIPS - these at least compile with minimal configurations. This will affect all archs. Mostly the changes should be relatively easy. Take do_IRQ(), store the regs pointer at the beginning, saving the old one: struct pt_regs *old_regs = set_irq_regs(regs); And put the old one back at the end: set_irq_regs(old_regs); Don't pass regs through to generic_handle_irq() or __do_IRQ(). In timer_interrupt(), this sort of change will be necessary: - update_process_times(user_mode(regs)); - profile_tick(CPU_PROFILING, regs); + update_process_times(user_mode(get_irq_regs())); + profile_tick(CPU_PROFILING); I'd like to move update_process_times()'s use of get_irq_regs() into itself, except that i386, alone of the archs, uses something other than user_mode(). Some notes on the interrupt handling in the drivers: (*) input_dev() is now gone entirely. The regs pointer is no longer stored in the input_dev struct. (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does something different depending on whether it's been supplied with a regs pointer or not. (*) Various IRQ handler function pointers have been moved to type irq_handler_t. Signed-Off-By: David Howells <dhowells@redhat.com> (cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 21:55:46 +08:00
cd2401_modem_interrupt(int irq, void *dev_id)
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
{
struct cyclades_port *info;
volatile unsigned char *base_addr = (unsigned char *)BASE_ADDR;
int channel;
int mdm_change;
int mdm_status;
/* determine the channel and change to that context */
channel = (u_short ) (base_addr[CyLICR] >> 2);
info = &cy_port[channel];
info->last_active = jiffies;
mdm_change = base_addr[CyMISR];
mdm_status = base_addr[CyMSVR1];
if(info->tty == 0){ /* nowhere to put the data, ignore it */
;
}else{
if((mdm_change & CyDCD)
&& (info->flags & ASYNC_CHECK_CD)){
if(mdm_status & CyDCD){
/* CP('!'); */
cy_sched_event(info, Cy_EVENT_OPEN_WAKEUP);
} else {
/* CP('@'); */
cy_sched_event(info, Cy_EVENT_HANGUP);
}
}
if((mdm_change & CyCTS)
&& (info->flags & ASYNC_CTS_FLOW)){
if(info->tty->stopped){
if(mdm_status & CyCTS){
/* !!! cy_start isn't used because... */
info->tty->stopped = 0;
base_addr[CyIER] |= CyTxMpty;
cy_sched_event(info, Cy_EVENT_WRITE_WAKEUP);
}
}else{
if(!(mdm_status & CyCTS)){
/* !!! cy_stop isn't used because... */
info->tty->stopped = 1;
base_addr[CyIER] &= ~(CyTxMpty|CyTxRdy);
}
}
}
if(mdm_status & CyDSR){
}
}
base_addr[CyMEOIR] = 0;
return IRQ_HANDLED;
} /* cy_modem_interrupt */
static irqreturn_t
IRQ: Maintain regs pointer globally rather than passing to IRQ handlers Maintain a per-CPU global "struct pt_regs *" variable which can be used instead of passing regs around manually through all ~1800 interrupt handlers in the Linux kernel. The regs pointer is used in few places, but it potentially costs both stack space and code to pass it around. On the FRV arch, removing the regs parameter from all the genirq function results in a 20% speed up of the IRQ exit path (ie: from leaving timer_interrupt() to leaving do_IRQ()). Where appropriate, an arch may override the generic storage facility and do something different with the variable. On FRV, for instance, the address is maintained in GR28 at all times inside the kernel as part of general exception handling. Having looked over the code, it appears that the parameter may be handed down through up to twenty or so layers of functions. Consider a USB character device attached to a USB hub, attached to a USB controller that posts its interrupts through a cascaded auxiliary interrupt controller. A character device driver may want to pass regs to the sysrq handler through the input layer which adds another few layers of parameter passing. I've build this code with allyesconfig for x86_64 and i386. I've runtested the main part of the code on FRV and i386, though I can't test most of the drivers. I've also done partial conversion for powerpc and MIPS - these at least compile with minimal configurations. This will affect all archs. Mostly the changes should be relatively easy. Take do_IRQ(), store the regs pointer at the beginning, saving the old one: struct pt_regs *old_regs = set_irq_regs(regs); And put the old one back at the end: set_irq_regs(old_regs); Don't pass regs through to generic_handle_irq() or __do_IRQ(). In timer_interrupt(), this sort of change will be necessary: - update_process_times(user_mode(regs)); - profile_tick(CPU_PROFILING, regs); + update_process_times(user_mode(get_irq_regs())); + profile_tick(CPU_PROFILING); I'd like to move update_process_times()'s use of get_irq_regs() into itself, except that i386, alone of the archs, uses something other than user_mode(). Some notes on the interrupt handling in the drivers: (*) input_dev() is now gone entirely. The regs pointer is no longer stored in the input_dev struct. (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does something different depending on whether it's been supplied with a regs pointer or not. (*) Various IRQ handler function pointers have been moved to type irq_handler_t. Signed-Off-By: David Howells <dhowells@redhat.com> (cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 21:55:46 +08:00
cd2401_tx_interrupt(int irq, void *dev_id)
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
{
struct cyclades_port *info;
volatile unsigned char *base_addr = (unsigned char *)BASE_ADDR;
int channel;
int char_count, saved_cnt;
int outch;
/* determine the channel and change to that context */
channel = (u_short ) (base_addr[CyLICR] >> 2);
#ifdef CONFIG_REMOTE_DEBUG
if (channel == DEBUG_PORT) {
panic ("TxInt on debug port!!!");
}
#endif
info = &cy_port[channel];
/* validate the port number (as configured and open) */
if( (channel < 0) || (NR_PORTS <= channel) ){
base_addr[CyIER] &= ~(CyTxMpty|CyTxRdy);
base_addr[CyTEOIR] = CyNOTRANS;
return IRQ_HANDLED;
}
info->last_active = jiffies;
if(info->tty == 0){
base_addr[CyIER] &= ~(CyTxMpty|CyTxRdy);
if (info->xmit_cnt < WAKEUP_CHARS) {
cy_sched_event(info, Cy_EVENT_WRITE_WAKEUP);
}
base_addr[CyTEOIR] = CyNOTRANS;
return IRQ_HANDLED;
}
/* load the on-chip space available for outbound data */
saved_cnt = char_count = base_addr[CyTFTC];
if(info->x_char) { /* send special char */
outch = info->x_char;
base_addr[CyTDR] = outch;
char_count--;
info->x_char = 0;
}
if (info->x_break){
/* The Cirrus chip requires the "Embedded Transmit
Commands" of start break, delay, and end break
sequences to be sent. The duration of the
break is given in TICs, which runs at HZ
(typically 100) and the PPR runs at 200 Hz,
so the delay is duration * 200/HZ, and thus a
break can run from 1/100 sec to about 5/4 sec.
Need to check these values - RGH 141095.
*/
base_addr[CyTDR] = 0; /* start break */
base_addr[CyTDR] = 0x81;
base_addr[CyTDR] = 0; /* delay a bit */
base_addr[CyTDR] = 0x82;
base_addr[CyTDR] = info->x_break*200/HZ;
base_addr[CyTDR] = 0; /* terminate break */
base_addr[CyTDR] = 0x83;
char_count -= 7;
info->x_break = 0;
}
while (char_count > 0){
if (!info->xmit_cnt){
base_addr[CyIER] &= ~(CyTxMpty|CyTxRdy);
break;
}
if (info->xmit_buf == 0){
base_addr[CyIER] &= ~(CyTxMpty|CyTxRdy);
break;
}
if (info->tty->stopped || info->tty->hw_stopped){
base_addr[CyIER] &= ~(CyTxMpty|CyTxRdy);
break;
}
/* Because the Embedded Transmit Commands have been
enabled, we must check to see if the escape
character, NULL, is being sent. If it is, we
must ensure that there is room for it to be
doubled in the output stream. Therefore we
no longer advance the pointer when the character
is fetched, but rather wait until after the check
for a NULL output character. (This is necessary
because there may not be room for the two chars
needed to send a NULL.
*/
outch = info->xmit_buf[info->xmit_tail];
if( outch ){
info->xmit_cnt--;
info->xmit_tail = (info->xmit_tail + 1)
& (PAGE_SIZE - 1);
base_addr[CyTDR] = outch;
char_count--;
}else{
if(char_count > 1){
info->xmit_cnt--;
info->xmit_tail = (info->xmit_tail + 1)
& (PAGE_SIZE - 1);
base_addr[CyTDR] = outch;
base_addr[CyTDR] = 0;
char_count--;
char_count--;
}else{
break;
}
}
}
if (info->xmit_cnt < WAKEUP_CHARS) {
cy_sched_event(info, Cy_EVENT_WRITE_WAKEUP);
}
base_addr[CyTEOIR] = (char_count != saved_cnt) ? 0 : CyNOTRANS;
return IRQ_HANDLED;
} /* cy_tx_interrupt */
static irqreturn_t
IRQ: Maintain regs pointer globally rather than passing to IRQ handlers Maintain a per-CPU global "struct pt_regs *" variable which can be used instead of passing regs around manually through all ~1800 interrupt handlers in the Linux kernel. The regs pointer is used in few places, but it potentially costs both stack space and code to pass it around. On the FRV arch, removing the regs parameter from all the genirq function results in a 20% speed up of the IRQ exit path (ie: from leaving timer_interrupt() to leaving do_IRQ()). Where appropriate, an arch may override the generic storage facility and do something different with the variable. On FRV, for instance, the address is maintained in GR28 at all times inside the kernel as part of general exception handling. Having looked over the code, it appears that the parameter may be handed down through up to twenty or so layers of functions. Consider a USB character device attached to a USB hub, attached to a USB controller that posts its interrupts through a cascaded auxiliary interrupt controller. A character device driver may want to pass regs to the sysrq handler through the input layer which adds another few layers of parameter passing. I've build this code with allyesconfig for x86_64 and i386. I've runtested the main part of the code on FRV and i386, though I can't test most of the drivers. I've also done partial conversion for powerpc and MIPS - these at least compile with minimal configurations. This will affect all archs. Mostly the changes should be relatively easy. Take do_IRQ(), store the regs pointer at the beginning, saving the old one: struct pt_regs *old_regs = set_irq_regs(regs); And put the old one back at the end: set_irq_regs(old_regs); Don't pass regs through to generic_handle_irq() or __do_IRQ(). In timer_interrupt(), this sort of change will be necessary: - update_process_times(user_mode(regs)); - profile_tick(CPU_PROFILING, regs); + update_process_times(user_mode(get_irq_regs())); + profile_tick(CPU_PROFILING); I'd like to move update_process_times()'s use of get_irq_regs() into itself, except that i386, alone of the archs, uses something other than user_mode(). Some notes on the interrupt handling in the drivers: (*) input_dev() is now gone entirely. The regs pointer is no longer stored in the input_dev struct. (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does something different depending on whether it's been supplied with a regs pointer or not. (*) Various IRQ handler function pointers have been moved to type irq_handler_t. Signed-Off-By: David Howells <dhowells@redhat.com> (cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 21:55:46 +08:00
cd2401_rx_interrupt(int irq, void *dev_id)
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
{
struct tty_struct *tty;
struct cyclades_port *info;
volatile unsigned char *base_addr = (unsigned char *)BASE_ADDR;
int channel;
char data;
int char_count;
int save_cnt;
/* determine the channel and change to that context */
channel = (u_short ) (base_addr[CyLICR] >> 2);
info = &cy_port[channel];
info->last_active = jiffies;
save_cnt = char_count = base_addr[CyRFOC];
#ifdef CONFIG_REMOTE_DEBUG
if (channel == DEBUG_PORT) {
while (char_count--) {
data = base_addr[CyRDR];
queueDebugChar(data);
}
}
else
#endif
/* if there is nowhere to put the data, discard it */
if(info->tty == 0){
while(char_count--){
data = base_addr[CyRDR];
}
}else{ /* there is an open port for this data */
tty = info->tty;
/* load # characters available from the chip */
#ifdef CYCLOM_ENABLE_MONITORING
++info->mon.int_count;
info->mon.char_count += char_count;
if (char_count > info->mon.char_max)
info->mon.char_max = char_count;
info->mon.char_last = char_count;
#endif
while(char_count--){
data = base_addr[CyRDR];
[PATCH] TTY layer buffering revamp The API and code have been through various bits of initial review by serial driver people but they definitely need to live somewhere for a while so the unconverted drivers can get knocked into shape, existing drivers that have been updated can be better tuned and bugs whacked out. This replaces the tty flip buffers with kmalloc objects in rings. In the normal situation for an IRQ driven serial port at typical speeds the behaviour is pretty much the same, two buffers end up allocated and the kernel cycles between them as before. When there are delays or at high speed we now behave far better as the buffer pool can grow a bit rather than lose characters. This also means that we can operate at higher speeds reliably. For drivers that receive characters in blocks (DMA based, USB and especially virtualisation) the layer allows a lot of driver specific code that works around the tty layer with private secondary queues to be removed. The IBM folks need this sort of layer, the smart serial port people do, the virtualisers do (because a virtualised tty typically operates at infinite speed rather than emulating 9600 baud). Finally many drivers had invalid and unsafe attempts to avoid buffer overflows by directly invoking tty methods extracted out of the innards of work queue structs. These are no longer needed and all go away. That fixes various random hangs with serial ports on overflow. The other change in here is to optimise the receive_room path that is used by some callers. It turns out that only one ldisc uses receive room except asa constant and it updates it far far less than the value is read. We thus make it a variable not a function call. I expect the code to contain bugs due to the size alone but I'll be watching and squashing them and feeding out new patches as it goes. Because the buffers now dynamically expand you should only run out of buffering when the kernel runs out of memory for real. That means a lot of the horrible hacks high performance drivers used to do just aren't needed any more. Description: tty_insert_flip_char is an old API and continues to work as before, as does tty_flip_buffer_push() [this is why many drivers dont need modification]. It does now also return the number of chars inserted There are also tty_buffer_request_room(tty, len) which asks for a buffer block of the length requested and returns the space found. This improves efficiency with hardware that knows how much to transfer. and tty_insert_flip_string_flags(tty, str, flags, len) to insert a string of characters and flags For a smart interface the usual code is len = tty_request_buffer_room(tty, amount_hardware_says); tty_insert_flip_string(tty, buffer_from_card, len); More description! At the moment tty buffers are attached directly to the tty. This is causing a lot of the problems related to tty layer locking, also problems at high speed and also with bursty data (such as occurs in virtualised environments) I'm working on ripping out the flip buffers and replacing them with a pool of dynamically allocated buffers. This allows both for old style "byte I/O" devices and also helps virtualisation and smart devices where large blocks of data suddenely materialise and need storing. So far so good. Lots of drivers reference tty->flip.*. Several of them also call directly and unsafely into function pointers it provides. This will all break. Most drivers can use tty_insert_flip_char which can be kept as an API but others need more. At the moment I've added the following interfaces, if people think more will be needed now is a good time to say int tty_buffer_request_room(tty, size) Try and ensure at least size bytes are available, returns actual room (may be zero). At the moment it just uses the flipbuf space but that will change. Repeated calls without characters being added are not cumulative. (ie if you call it with 1, 1, 1, and then 4 you'll have four characters of space. The other functions will also try and grow buffers in future but this will be a more efficient way when you know block sizes. int tty_insert_flip_char(tty, ch, flag) As before insert a character if there is room. Now returns 1 for success, 0 for failure. int tty_insert_flip_string(tty, str, len) Insert a block of non error characters. Returns the number inserted. int tty_prepare_flip_string(tty, strptr, len) Adjust the buffer to allow len characters to be added. Returns a buffer pointer in strptr and the length available. This allows for hardware that needs to use functions like insl or mencpy_fromio. Signed-off-by: Alan Cox <alan@redhat.com> Cc: Paul Fulghum <paulkf@microgate.com> Signed-off-by: Hirokazu Takata <takata@linux-m32r.org> Signed-off-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: John Hawkes <hawkes@sgi.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 12:54:13 +08:00
tty_insert_flip_char(tty, data, TTY_NORMAL);
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
#ifdef CYCLOM_16Y_HACK
udelay(10L);
#endif
}
schedule_delayed_work(&tty->flip.work, 1);
}
/* end of service */
base_addr[CyREOIR] = save_cnt ? 0 : CyNOTRANS;
return IRQ_HANDLED;
} /* cy_rx_interrupt */
/*
* This routine is used to handle the "bottom half" processing for the
* serial driver, known also the "software interrupt" processing.
* This processing is done at the kernel interrupt level, after the
* cy#/_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This
* is where time-consuming activities which can not be done in the
* interrupt driver proper are done; the interrupt driver schedules
* them using cy_sched_event(), and they get done here.
*
* This is done through one level of indirection--the task queue.
* When a hardware interrupt service routine wants service by the
* driver's bottom half, it enqueues the appropriate tq_struct (one
* per port) to the keventd work queue and sets a request flag
* that the work queue be processed.
*
* Although this may seem unwieldy, it gives the system a way to
* pass an argument (in this case the pointer to the cyclades_port
* structure) to the bottom half of the driver. Previous kernels
* had to poll every port to see if that port needed servicing.
*/
static void
do_softint(void *private_)
{
struct cyclades_port *info = (struct cyclades_port *) private_;
struct tty_struct *tty;
tty = info->tty;
if (!tty)
return;
if (test_and_clear_bit(Cy_EVENT_HANGUP, &info->event)) {
tty_hangup(info->tty);
wake_up_interruptible(&info->open_wait);
info->flags &= ~ASYNC_NORMAL_ACTIVE;
}
if (test_and_clear_bit(Cy_EVENT_OPEN_WAKEUP, &info->event)) {
wake_up_interruptible(&info->open_wait);
}
if (test_and_clear_bit(Cy_EVENT_WRITE_WAKEUP, &info->event)) {
tty_wakeup(tty);
}
} /* do_softint */
/* This is called whenever a port becomes active;
interrupts are enabled and DTR & RTS are turned on.
*/
static int
startup(struct cyclades_port * info)
{
unsigned long flags;
volatile unsigned char *base_addr = (unsigned char *)BASE_ADDR;
int channel;
if (info->flags & ASYNC_INITIALIZED){
return 0;
}
if (!info->type){
if (info->tty){
set_bit(TTY_IO_ERROR, &info->tty->flags);
}
return 0;
}
if (!info->xmit_buf){
info->xmit_buf = (unsigned char *) get_zeroed_page (GFP_KERNEL);
if (!info->xmit_buf){
return -ENOMEM;
}
}
config_setup(info);
channel = info->line;
#ifdef SERIAL_DEBUG_OPEN
printk("startup channel %d\n", channel);
#endif
local_irq_save(flags);
base_addr[CyCAR] = (u_char)channel;
write_cy_cmd(base_addr,CyENB_RCVR|CyENB_XMTR);
base_addr[CyCAR] = (u_char)channel; /* !!! Is this needed? */
base_addr[CyMSVR1] = CyRTS;
/* CP('S');CP('1'); */
base_addr[CyMSVR2] = CyDTR;
#ifdef SERIAL_DEBUG_DTR
printk("cyc: %d: raising DTR\n", __LINE__);
printk(" status: 0x%x, 0x%x\n", base_addr[CyMSVR1], base_addr[CyMSVR2]);
#endif
base_addr[CyIER] |= CyRxData;
info->flags |= ASYNC_INITIALIZED;
if (info->tty){
clear_bit(TTY_IO_ERROR, &info->tty->flags);
}
info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
local_irq_restore(flags);
#ifdef SERIAL_DEBUG_OPEN
printk(" done\n");
#endif
return 0;
} /* startup */
void
start_xmit( struct cyclades_port *info )
{
unsigned long flags;
volatile unsigned char *base_addr = (u_char *)BASE_ADDR;
int channel;
channel = info->line;
local_irq_save(flags);
base_addr[CyCAR] = channel;
base_addr[CyIER] |= CyTxMpty;
local_irq_restore(flags);
} /* start_xmit */
/*
* This routine shuts down a serial port; interrupts are disabled,
* and DTR is dropped if the hangup on close termio flag is on.
*/
static void
shutdown(struct cyclades_port * info)
{
unsigned long flags;
volatile unsigned char *base_addr = (u_char *)BASE_ADDR;
int channel;
if (!(info->flags & ASYNC_INITIALIZED)){
/* CP('$'); */
return;
}
channel = info->line;
#ifdef SERIAL_DEBUG_OPEN
printk("shutdown channel %d\n", channel);
#endif
/* !!! REALLY MUST WAIT FOR LAST CHARACTER TO BE
SENT BEFORE DROPPING THE LINE !!! (Perhaps
set some flag that is read when XMTY happens.)
Other choices are to delay some fixed interval
or schedule some later processing.
*/
local_irq_save(flags);
if (info->xmit_buf){
free_page((unsigned long) info->xmit_buf);
info->xmit_buf = 0;
}
base_addr[CyCAR] = (u_char)channel;
if (!info->tty || (info->tty->termios->c_cflag & HUPCL)) {
base_addr[CyMSVR1] = 0;
/* CP('C');CP('1'); */
base_addr[CyMSVR2] = 0;
#ifdef SERIAL_DEBUG_DTR
printk("cyc: %d: dropping DTR\n", __LINE__);
printk(" status: 0x%x, 0x%x\n", base_addr[CyMSVR1], base_addr[CyMSVR2]);
#endif
}
write_cy_cmd(base_addr,CyDIS_RCVR);
/* it may be appropriate to clear _XMIT at
some later date (after testing)!!! */
if (info->tty){
set_bit(TTY_IO_ERROR, &info->tty->flags);
}
info->flags &= ~ASYNC_INITIALIZED;
local_irq_restore(flags);
#ifdef SERIAL_DEBUG_OPEN
printk(" done\n");
#endif
return;
} /* shutdown */
/*
* This routine finds or computes the various line characteristics.
*/
static void
config_setup(struct cyclades_port * info)
{
unsigned long flags;
volatile unsigned char *base_addr = (u_char *)BASE_ADDR;
int channel;
unsigned cflag;
int i;
unsigned char ti, need_init_chan = 0;
if (!info->tty || !info->tty->termios){
return;
}
if (info->line == -1){
return;
}
cflag = info->tty->termios->c_cflag;
/* baud rate */
i = cflag & CBAUD;
#ifdef CBAUDEX
/* Starting with kernel 1.1.65, there is direct support for
higher baud rates. The following code supports those
changes. The conditional aspect allows this driver to be
used for earlier as well as later kernel versions. (The
mapping is slightly different from serial.c because there
is still the possibility of supporting 75 kbit/sec with
the Cyclades board.)
*/
if (i & CBAUDEX) {
if (i == B57600)
i = 16;
else if(i == B115200)
i = 18;
#ifdef B78600
else if(i == B78600)
i = 17;
#endif
else
info->tty->termios->c_cflag &= ~CBAUDEX;
}
#endif
if (i == 15) {
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
i += 1;
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
i += 3;
}
/* Don't ever change the speed of the console port. It will
* run at the speed specified in bootinfo, or at 19.2K */
/* Actually, it should run at whatever speed 166Bug was using */
/* Note info->timeout isn't used at present */
if (info != serial_console_info) {
info->tbpr = baud_bpr[i]; /* Tx BPR */
info->tco = baud_co[i]; /* Tx CO */
info->rbpr = baud_bpr[i]; /* Rx BPR */
info->rco = baud_co[i] >> 5; /* Rx CO */
if (baud_table[i] == 134) {
info->timeout = (info->xmit_fifo_size*HZ*30/269) + 2;
/* get it right for 134.5 baud */
} else if (baud_table[i]) {
info->timeout = (info->xmit_fifo_size*HZ*15/baud_table[i]) + 2;
/* this needs to be propagated into the card info */
} else {
info->timeout = 0;
}
}
/* By tradition (is it a standard?) a baud rate of zero
implies the line should be/has been closed. A bit
later in this routine such a test is performed. */
/* byte size and parity */
info->cor7 = 0;
info->cor6 = 0;
info->cor5 = 0;
info->cor4 = (info->default_threshold
? info->default_threshold
: baud_cor4[i]); /* receive threshold */
/* Following two lines added 101295, RGH. */
/* It is obviously wrong to access CyCORx, and not info->corx here,
* try and remember to fix it later! */
channel = info->line;
base_addr[CyCAR] = (u_char)channel;
if (C_CLOCAL(info->tty)) {
if (base_addr[CyIER] & CyMdmCh)
base_addr[CyIER] &= ~CyMdmCh; /* without modem intr */
/* ignore 1->0 modem transitions */
if (base_addr[CyCOR4] & (CyDSR|CyCTS|CyDCD))
base_addr[CyCOR4] &= ~(CyDSR|CyCTS|CyDCD);
/* ignore 0->1 modem transitions */
if (base_addr[CyCOR5] & (CyDSR|CyCTS|CyDCD))
base_addr[CyCOR5] &= ~(CyDSR|CyCTS|CyDCD);
} else {
if ((base_addr[CyIER] & CyMdmCh) != CyMdmCh)
base_addr[CyIER] |= CyMdmCh; /* with modem intr */
/* act on 1->0 modem transitions */
if ((base_addr[CyCOR4] & (CyDSR|CyCTS|CyDCD)) != (CyDSR|CyCTS|CyDCD))
base_addr[CyCOR4] |= CyDSR|CyCTS|CyDCD;
/* act on 0->1 modem transitions */
if ((base_addr[CyCOR5] & (CyDSR|CyCTS|CyDCD)) != (CyDSR|CyCTS|CyDCD))
base_addr[CyCOR5] |= CyDSR|CyCTS|CyDCD;
}
info->cor3 = (cflag & CSTOPB) ? Cy_2_STOP : Cy_1_STOP;
info->cor2 = CyETC;
switch(cflag & CSIZE){
case CS5:
info->cor1 = Cy_5_BITS;
break;
case CS6:
info->cor1 = Cy_6_BITS;
break;
case CS7:
info->cor1 = Cy_7_BITS;
break;
case CS8:
info->cor1 = Cy_8_BITS;
break;
}
if (cflag & PARENB){
if (cflag & PARODD){
info->cor1 |= CyPARITY_O;
}else{
info->cor1 |= CyPARITY_E;
}
}else{
info->cor1 |= CyPARITY_NONE;
}
/* CTS flow control flag */
#if 0
/* Don't complcate matters for now! RGH 141095 */
if (cflag & CRTSCTS){
info->flags |= ASYNC_CTS_FLOW;
info->cor2 |= CyCtsAE;
}else{
info->flags &= ~ASYNC_CTS_FLOW;
info->cor2 &= ~CyCtsAE;
}
#endif
if (cflag & CLOCAL)
info->flags &= ~ASYNC_CHECK_CD;
else
info->flags |= ASYNC_CHECK_CD;
/***********************************************
The hardware option, CyRtsAO, presents RTS when
the chip has characters to send. Since most modems
use RTS as reverse (inbound) flow control, this
option is not used. If inbound flow control is
necessary, DTR can be programmed to provide the
appropriate signals for use with a non-standard
cable. Contact Marcio Saito for details.
***********************************************/
channel = info->line;
local_irq_save(flags);
base_addr[CyCAR] = (u_char)channel;
/* CyCMR set once only in mvme167_init_serial() */
if (base_addr[CyLICR] != channel << 2)
base_addr[CyLICR] = channel << 2;
if (base_addr[CyLIVR] != 0x5c)
base_addr[CyLIVR] = 0x5c;
/* tx and rx baud rate */
if (base_addr[CyCOR1] != info->cor1)
need_init_chan = 1;
if (base_addr[CyTCOR] != info->tco)
base_addr[CyTCOR] = info->tco;
if (base_addr[CyTBPR] != info->tbpr)
base_addr[CyTBPR] = info->tbpr;
if (base_addr[CyRCOR] != info->rco)
base_addr[CyRCOR] = info->rco;
if (base_addr[CyRBPR] != info->rbpr)
base_addr[CyRBPR] = info->rbpr;
/* set line characteristics according configuration */
if (base_addr[CySCHR1] != START_CHAR(info->tty))
base_addr[CySCHR1] = START_CHAR(info->tty);
if (base_addr[CySCHR2] != STOP_CHAR(info->tty))
base_addr[CySCHR2] = STOP_CHAR(info->tty);
if (base_addr[CySCRL] != START_CHAR(info->tty))
base_addr[CySCRL] = START_CHAR(info->tty);
if (base_addr[CySCRH] != START_CHAR(info->tty))
base_addr[CySCRH] = START_CHAR(info->tty);
if (base_addr[CyCOR1] != info->cor1)
base_addr[CyCOR1] = info->cor1;
if (base_addr[CyCOR2] != info->cor2)
base_addr[CyCOR2] = info->cor2;
if (base_addr[CyCOR3] != info->cor3)
base_addr[CyCOR3] = info->cor3;
if (base_addr[CyCOR4] != info->cor4)
base_addr[CyCOR4] = info->cor4;
if (base_addr[CyCOR5] != info->cor5)
base_addr[CyCOR5] = info->cor5;
if (base_addr[CyCOR6] != info->cor6)
base_addr[CyCOR6] = info->cor6;
if (base_addr[CyCOR7] != info->cor7)
base_addr[CyCOR7] = info->cor7;
if (need_init_chan)
write_cy_cmd(base_addr,CyINIT_CHAN);
base_addr[CyCAR] = (u_char)channel; /* !!! Is this needed? */
/* 2ms default rx timeout */
ti = info->default_timeout ? info->default_timeout : 0x02;
if (base_addr[CyRTPRL] != ti)
base_addr[CyRTPRL] = ti;
if (base_addr[CyRTPRH] != 0)
base_addr[CyRTPRH] = 0;
/* Set up RTS here also ????? RGH 141095 */
if(i == 0){ /* baud rate is zero, turn off line */
if ((base_addr[CyMSVR2] & CyDTR) == CyDTR)
base_addr[CyMSVR2] = 0;
#ifdef SERIAL_DEBUG_DTR
printk("cyc: %d: dropping DTR\n", __LINE__);
printk(" status: 0x%x, 0x%x\n", base_addr[CyMSVR1], base_addr[CyMSVR2]);
#endif
}else{
if ((base_addr[CyMSVR2] & CyDTR) != CyDTR)
base_addr[CyMSVR2] = CyDTR;
#ifdef SERIAL_DEBUG_DTR
printk("cyc: %d: raising DTR\n", __LINE__);
printk(" status: 0x%x, 0x%x\n", base_addr[CyMSVR1], base_addr[CyMSVR2]);
#endif
}
if (info->tty){
clear_bit(TTY_IO_ERROR, &info->tty->flags);
}
local_irq_restore(flags);
} /* config_setup */
static void
cy_put_char(struct tty_struct *tty, unsigned char ch)
{
struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
unsigned long flags;
#ifdef SERIAL_DEBUG_IO
printk("cy_put_char %s(0x%02x)\n", tty->name, ch);
#endif
if (serial_paranoia_check(info, tty->name, "cy_put_char"))
return;
[PATCH] Char: serial167, remove useless tty check serial167, remove useless tty check tty is dereferenced before it is checked to be non-NULL. Remove such check. Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-10-04 17:15:28 +08:00
if (!info->xmit_buf)
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
return;
local_irq_save(flags);
if (info->xmit_cnt >= PAGE_SIZE - 1) {
local_irq_restore(flags);
return;
}
info->xmit_buf[info->xmit_head++] = ch;
info->xmit_head &= PAGE_SIZE - 1;
info->xmit_cnt++;
local_irq_restore(flags);
} /* cy_put_char */
static void
cy_flush_chars(struct tty_struct *tty)
{
struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
unsigned long flags;
volatile unsigned char *base_addr = (u_char *)BASE_ADDR;
int channel;
#ifdef SERIAL_DEBUG_IO
printk("cy_flush_chars %s\n", tty->name); /* */
#endif
if (serial_paranoia_check(info, tty->name, "cy_flush_chars"))
return;
if (info->xmit_cnt <= 0 || tty->stopped
|| tty->hw_stopped || !info->xmit_buf)
return;
channel = info->line;
local_irq_save(flags);
base_addr[CyCAR] = channel;
base_addr[CyIER] |= CyTxMpty;
local_irq_restore(flags);
} /* cy_flush_chars */
/* This routine gets called when tty_write has put something into
the write_queue. If the port is not already transmitting stuff,
start it off by enabling interrupts. The interrupt service
routine will then ensure that the characters are sent. If the
port is already active, there is no need to kick it.
*/
static int
cy_write(struct tty_struct * tty,
const unsigned char *buf, int count)
{
struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
unsigned long flags;
int c, total = 0;
#ifdef SERIAL_DEBUG_IO
printk("cy_write %s\n", tty->name); /* */
#endif
if (serial_paranoia_check(info, tty->name, "cy_write")){
return 0;
}
[PATCH] Char: serial167, remove useless tty check serial167, remove useless tty check tty is dereferenced before it is checked to be non-NULL. Remove such check. Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-10-04 17:15:28 +08:00
if (!info->xmit_buf){
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
return 0;
}
while (1) {
local_irq_save(flags);
c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
SERIAL_XMIT_SIZE - info->xmit_head));
if (c <= 0) {
local_irq_restore(flags);
break;
}
memcpy(info->xmit_buf + info->xmit_head, buf, c);
info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
info->xmit_cnt += c;
local_irq_restore(flags);
buf += c;
count -= c;
total += c;
}
if (info->xmit_cnt
&& !tty->stopped
&& !tty->hw_stopped ) {
start_xmit(info);
}
return total;
} /* cy_write */
static int
cy_write_room(struct tty_struct *tty)
{
struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
int ret;
#ifdef SERIAL_DEBUG_IO
printk("cy_write_room %s\n", tty->name); /* */
#endif
if (serial_paranoia_check(info, tty->name, "cy_write_room"))
return 0;
ret = PAGE_SIZE - info->xmit_cnt - 1;
if (ret < 0)
ret = 0;
return ret;
} /* cy_write_room */
static int
cy_chars_in_buffer(struct tty_struct *tty)
{
struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
#ifdef SERIAL_DEBUG_IO
printk("cy_chars_in_buffer %s %d\n", tty->name, info->xmit_cnt); /* */
#endif
if (serial_paranoia_check(info, tty->name, "cy_chars_in_buffer"))
return 0;
return info->xmit_cnt;
} /* cy_chars_in_buffer */
static void
cy_flush_buffer(struct tty_struct *tty)
{
struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
unsigned long flags;
#ifdef SERIAL_DEBUG_IO
printk("cy_flush_buffer %s\n", tty->name); /* */
#endif
if (serial_paranoia_check(info, tty->name, "cy_flush_buffer"))
return;
local_irq_save(flags);
info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
local_irq_restore(flags);
tty_wakeup(tty);
} /* cy_flush_buffer */
/* This routine is called by the upper-layer tty layer to signal
that incoming characters should be throttled or that the
throttle should be released.
*/
static void
cy_throttle(struct tty_struct * tty)
{
struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
unsigned long flags;
volatile unsigned char *base_addr = (u_char *)BASE_ADDR;
int channel;
#ifdef SERIAL_DEBUG_THROTTLE
char buf[64];
printk("throttle %s: %d....\n", tty_name(tty, buf),
tty->ldisc.chars_in_buffer(tty));
printk("cy_throttle %s\n", tty->name);
#endif
if (serial_paranoia_check(info, tty->name, "cy_nthrottle")){
return;
}
if (I_IXOFF(tty)) {
info->x_char = STOP_CHAR(tty);
/* Should use the "Send Special Character" feature!!! */
}
channel = info->line;
local_irq_save(flags);
base_addr[CyCAR] = (u_char)channel;
base_addr[CyMSVR1] = 0;
local_irq_restore(flags);
return;
} /* cy_throttle */
static void
cy_unthrottle(struct tty_struct * tty)
{
struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
unsigned long flags;
volatile unsigned char *base_addr = (u_char *)BASE_ADDR;
int channel;
#ifdef SERIAL_DEBUG_THROTTLE
char buf[64];
printk("throttle %s: %d....\n", tty_name(tty, buf),
tty->ldisc.chars_in_buffer(tty));
printk("cy_unthrottle %s\n", tty->name);
#endif
if (serial_paranoia_check(info, tty->name, "cy_nthrottle")){
return;
}
if (I_IXOFF(tty)) {
info->x_char = START_CHAR(tty);
/* Should use the "Send Special Character" feature!!! */
}
channel = info->line;
local_irq_save(flags);
base_addr[CyCAR] = (u_char)channel;
base_addr[CyMSVR1] = CyRTS;
local_irq_restore(flags);
return;
} /* cy_unthrottle */
static int
get_serial_info(struct cyclades_port * info,
struct serial_struct * retinfo)
{
struct serial_struct tmp;
/* CP('g'); */
if (!retinfo)
return -EFAULT;
memset(&tmp, 0, sizeof(tmp));
tmp.type = info->type;
tmp.line = info->line;
tmp.port = info->line;
tmp.irq = 0;
tmp.flags = info->flags;
tmp.baud_base = 0; /*!!!*/
tmp.close_delay = info->close_delay;
tmp.custom_divisor = 0; /*!!!*/
tmp.hub6 = 0; /*!!!*/
return copy_to_user(retinfo,&tmp,sizeof(*retinfo)) ? -EFAULT : 0;
} /* get_serial_info */
static int
set_serial_info(struct cyclades_port * info,
struct serial_struct * new_info)
{
struct serial_struct new_serial;
struct cyclades_port old_info;
/* CP('s'); */
if (!new_info)
return -EFAULT;
if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
return -EFAULT;
old_info = *info;
if (!capable(CAP_SYS_ADMIN)) {
if ((new_serial.close_delay != info->close_delay) ||
((new_serial.flags & ASYNC_FLAGS & ~ASYNC_USR_MASK) !=
(info->flags & ASYNC_FLAGS & ~ASYNC_USR_MASK)))
return -EPERM;
info->flags = ((info->flags & ~ASYNC_USR_MASK) |
(new_serial.flags & ASYNC_USR_MASK));
goto check_and_exit;
}
/*
* OK, past this point, all the error checking has been done.
* At this point, we start making changes.....
*/
info->flags = ((info->flags & ~ASYNC_FLAGS) |
(new_serial.flags & ASYNC_FLAGS));
info->close_delay = new_serial.close_delay;
check_and_exit:
if (info->flags & ASYNC_INITIALIZED){
config_setup(info);
return 0;
}else{
return startup(info);
}
} /* set_serial_info */
static int
cy_tiocmget(struct tty_struct *tty, struct file *file)
{
struct cyclades_port * info = (struct cyclades_port *)tty->driver_data;
int channel;
volatile unsigned char *base_addr = (u_char *)BASE_ADDR;
unsigned long flags;
unsigned char status;
channel = info->line;
local_irq_save(flags);
base_addr[CyCAR] = (u_char)channel;
status = base_addr[CyMSVR1] | base_addr[CyMSVR2];
local_irq_restore(flags);
return ((status & CyRTS) ? TIOCM_RTS : 0)
| ((status & CyDTR) ? TIOCM_DTR : 0)
| ((status & CyDCD) ? TIOCM_CAR : 0)
| ((status & CyDSR) ? TIOCM_DSR : 0)
| ((status & CyCTS) ? TIOCM_CTS : 0);
} /* cy_tiocmget */
static int
cy_tiocmset(struct tty_struct *tty, struct file *file,
unsigned int set, unsigned int clear)
{
struct cyclades_port * info = (struct cyclades_port *)tty->driver_data;
int channel;
volatile unsigned char *base_addr = (u_char *)BASE_ADDR;
unsigned long flags;
channel = info->line;
if (set & TIOCM_RTS){
local_irq_save(flags);
base_addr[CyCAR] = (u_char)channel;
base_addr[CyMSVR1] = CyRTS;
local_irq_restore(flags);
}
if (set & TIOCM_DTR){
local_irq_save(flags);
base_addr[CyCAR] = (u_char)channel;
/* CP('S');CP('2'); */
base_addr[CyMSVR2] = CyDTR;
#ifdef SERIAL_DEBUG_DTR
printk("cyc: %d: raising DTR\n", __LINE__);
printk(" status: 0x%x, 0x%x\n", base_addr[CyMSVR1], base_addr[CyMSVR2]);
#endif
local_irq_restore(flags);
}
if (clear & TIOCM_RTS){
local_irq_save(flags);
base_addr[CyCAR] = (u_char)channel;
base_addr[CyMSVR1] = 0;
local_irq_restore(flags);
}
if (clear & TIOCM_DTR){
local_irq_save(flags);
base_addr[CyCAR] = (u_char)channel;
/* CP('C');CP('2'); */
base_addr[CyMSVR2] = 0;
#ifdef SERIAL_DEBUG_DTR
printk("cyc: %d: dropping DTR\n", __LINE__);
printk(" status: 0x%x, 0x%x\n", base_addr[CyMSVR1], base_addr[CyMSVR2]);
#endif
local_irq_restore(flags);
}
return 0;
} /* set_modem_info */
static void
send_break( struct cyclades_port * info, int duration)
{ /* Let the transmit ISR take care of this (since it
requires stuffing characters into the output stream).
*/
info->x_break = duration;
if (!info->xmit_cnt ) {
start_xmit(info);
}
} /* send_break */
static int
get_mon_info(struct cyclades_port * info, struct cyclades_monitor * mon)
{
if (copy_to_user(mon, &info->mon, sizeof(struct cyclades_monitor)))
return -EFAULT;
info->mon.int_count = 0;
info->mon.char_count = 0;
info->mon.char_max = 0;
info->mon.char_last = 0;
return 0;
}
static int
set_threshold(struct cyclades_port * info, unsigned long *arg)
{
volatile unsigned char *base_addr = (u_char *)BASE_ADDR;
unsigned long value;
int channel;
if (get_user(value, arg))
return -EFAULT;
channel = info->line;
info->cor4 &= ~CyREC_FIFO;
info->cor4 |= value & CyREC_FIFO;
base_addr[CyCOR4] = info->cor4;
return 0;
}
static int
get_threshold(struct cyclades_port * info, unsigned long *value)
{
volatile unsigned char *base_addr = (u_char *)BASE_ADDR;
int channel;
unsigned long tmp;
channel = info->line;
tmp = base_addr[CyCOR4] & CyREC_FIFO;
return put_user(tmp,value);
}
static int
set_default_threshold(struct cyclades_port * info, unsigned long *arg)
{
unsigned long value;
if (get_user(value, arg))
return -EFAULT;
info->default_threshold = value & 0x0f;
return 0;
}
static int
get_default_threshold(struct cyclades_port * info, unsigned long *value)
{
return put_user(info->default_threshold,value);
}
static int
set_timeout(struct cyclades_port * info, unsigned long *arg)
{
volatile unsigned char *base_addr = (u_char *)BASE_ADDR;
int channel;
unsigned long value;
if (get_user(value, arg))
return -EFAULT;
channel = info->line;
base_addr[CyRTPRL] = value & 0xff;
base_addr[CyRTPRH] = (value >> 8) & 0xff;
return 0;
}
static int
get_timeout(struct cyclades_port * info, unsigned long *value)
{
volatile unsigned char *base_addr = (u_char *)BASE_ADDR;
int channel;
unsigned long tmp;
channel = info->line;
tmp = base_addr[CyRTPRL];
return put_user(tmp,value);
}
static int
set_default_timeout(struct cyclades_port * info, unsigned long value)
{
info->default_timeout = value & 0xff;
return 0;
}
static int
get_default_timeout(struct cyclades_port * info, unsigned long *value)
{
return put_user(info->default_timeout,value);
}
static int
cy_ioctl(struct tty_struct *tty, struct file * file,
unsigned int cmd, unsigned long arg)
{
unsigned long val;
struct cyclades_port * info = (struct cyclades_port *)tty->driver_data;
int ret_val = 0;
#ifdef SERIAL_DEBUG_OTHER
printk("cy_ioctl %s, cmd = %x arg = %lx\n", tty->name, cmd, arg); /* */
#endif
switch (cmd) {
case CYGETMON:
ret_val = get_mon_info(info, (struct cyclades_monitor *)arg);
break;
case CYGETTHRESH:
ret_val = get_threshold(info, (unsigned long *)arg);
break;
case CYSETTHRESH:
ret_val = set_threshold(info, (unsigned long *)arg);
break;
case CYGETDEFTHRESH:
ret_val = get_default_threshold(info, (unsigned long *)arg);
break;
case CYSETDEFTHRESH:
ret_val = set_default_threshold(info, (unsigned long *)arg);
break;
case CYGETTIMEOUT:
ret_val = get_timeout(info, (unsigned long *)arg);
break;
case CYSETTIMEOUT:
ret_val = set_timeout(info, (unsigned long *)arg);
break;
case CYGETDEFTIMEOUT:
ret_val = get_default_timeout(info, (unsigned long *)arg);
break;
case CYSETDEFTIMEOUT:
ret_val = set_default_timeout(info, (unsigned long)arg);
break;
case TCSBRK: /* SVID version: non-zero arg --> no break */
ret_val = tty_check_change(tty);
if (ret_val)
break;
tty_wait_until_sent(tty,0);
if (!arg)
send_break(info, HZ/4); /* 1/4 second */
break;
case TCSBRKP: /* support for POSIX tcsendbreak() */
ret_val = tty_check_change(tty);
if (ret_val)
break;
tty_wait_until_sent(tty,0);
send_break(info, arg ? arg*(HZ/10) : HZ/4);
break;
/* The following commands are incompletely implemented!!! */
case TIOCGSOFTCAR:
ret_val = put_user(C_CLOCAL(tty) ? 1 : 0, (unsigned long *) arg);
break;
case TIOCSSOFTCAR:
ret_val = get_user(val, (unsigned long *) arg);
if (ret_val)
break;
tty->termios->c_cflag =
((tty->termios->c_cflag & ~CLOCAL) | (val ? CLOCAL : 0));
break;
case TIOCGSERIAL:
ret_val = get_serial_info(info, (struct serial_struct *) arg);
break;
case TIOCSSERIAL:
ret_val = set_serial_info(info,
(struct serial_struct *) arg);
break;
default:
ret_val = -ENOIOCTLCMD;
}
#ifdef SERIAL_DEBUG_OTHER
printk("cy_ioctl done\n");
#endif
return ret_val;
} /* cy_ioctl */
static void
cy_set_termios(struct tty_struct *tty, struct termios * old_termios)
{
struct cyclades_port *info = (struct cyclades_port *)tty->driver_data;
#ifdef SERIAL_DEBUG_OTHER
printk("cy_set_termios %s\n", tty->name);
#endif
if (tty->termios->c_cflag == old_termios->c_cflag)
return;
config_setup(info);
if ((old_termios->c_cflag & CRTSCTS) &&
!(tty->termios->c_cflag & CRTSCTS)) {
tty->stopped = 0;
cy_start(tty);
}
#ifdef tytso_patch_94Nov25_1726
if (!(old_termios->c_cflag & CLOCAL) &&
(tty->termios->c_cflag & CLOCAL))
wake_up_interruptible(&info->open_wait);
#endif
return;
} /* cy_set_termios */
static void
cy_close(struct tty_struct * tty, struct file * filp)
{
struct cyclades_port * info = (struct cyclades_port *)tty->driver_data;
/* CP('C'); */
#ifdef SERIAL_DEBUG_OTHER
printk("cy_close %s\n", tty->name);
#endif
if (!info
|| serial_paranoia_check(info, tty->name, "cy_close")){
return;
}
#ifdef SERIAL_DEBUG_OPEN
printk("cy_close %s, count = %d\n", tty->name, info->count);
#endif
if ((tty->count == 1) && (info->count != 1)) {
/*
* Uh, oh. tty->count is 1, which means that the tty
* structure will be freed. Info->count should always
* be one in these conditions. If it's greater than
* one, we've got real problems, since it means the
* serial port won't be shutdown.
*/
printk("cy_close: bad serial port count; tty->count is 1, "
"info->count is %d\n", info->count);
info->count = 1;
}
#ifdef SERIAL_DEBUG_COUNT
printk("cyc: %d: decrementing count to %d\n", __LINE__, info->count - 1);
#endif
if (--info->count < 0) {
printk("cy_close: bad serial port count for ttys%d: %d\n",
info->line, info->count);
#ifdef SERIAL_DEBUG_COUNT
printk("cyc: %d: setting count to 0\n", __LINE__);
#endif
info->count = 0;
}
if (info->count)
return;
info->flags |= ASYNC_CLOSING;
if (info->flags & ASYNC_INITIALIZED)
tty_wait_until_sent(tty, 3000); /* 30 seconds timeout */
shutdown(info);
if (tty->driver->flush_buffer)
tty->driver->flush_buffer(tty);
tty_ldisc_flush(tty);
info->event = 0;
info->tty = 0;
if (info->blocked_open) {
if (info->close_delay) {
msleep_interruptible(jiffies_to_msecs(info->close_delay));
}
wake_up_interruptible(&info->open_wait);
}
info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
wake_up_interruptible(&info->close_wait);
#ifdef SERIAL_DEBUG_OTHER
printk("cy_close done\n");
#endif
return;
} /* cy_close */
/*
* cy_hangup() --- called by tty_hangup() when a hangup is signaled.
*/
void
cy_hangup(struct tty_struct *tty)
{
struct cyclades_port * info = (struct cyclades_port *)tty->driver_data;
#ifdef SERIAL_DEBUG_OTHER
printk("cy_hangup %s\n", tty->name); /* */
#endif
if (serial_paranoia_check(info, tty->name, "cy_hangup"))
return;
shutdown(info);
#if 0
info->event = 0;
info->count = 0;
#ifdef SERIAL_DEBUG_COUNT
printk("cyc: %d: setting count to 0\n", __LINE__);
#endif
info->tty = 0;
#endif
info->flags &= ~ASYNC_NORMAL_ACTIVE;
wake_up_interruptible(&info->open_wait);
} /* cy_hangup */
/*
* ------------------------------------------------------------
* cy_open() and friends
* ------------------------------------------------------------
*/
static int
block_til_ready(struct tty_struct *tty, struct file * filp,
struct cyclades_port *info)
{
DECLARE_WAITQUEUE(wait, current);
unsigned long flags;
int channel;
int retval;
volatile u_char *base_addr = (u_char *)BASE_ADDR;
/*
* If the device is in the middle of being closed, then block
* until it's done, and then try again.
*/
if (info->flags & ASYNC_CLOSING) {
interruptible_sleep_on(&info->close_wait);
if (info->flags & ASYNC_HUP_NOTIFY){
return -EAGAIN;
}else{
return -ERESTARTSYS;
}
}
/*
* If non-blocking mode is set, then make the check up front
* and then exit.
*/
if (filp->f_flags & O_NONBLOCK) {
info->flags |= ASYNC_NORMAL_ACTIVE;
return 0;
}
/*
* Block waiting for the carrier detect and the line to become
* free (i.e., not in use by the callout). While we are in
* this loop, info->count is dropped by one, so that
* cy_close() knows when to free things. We restore it upon
* exit, either normal or abnormal.
*/
retval = 0;
add_wait_queue(&info->open_wait, &wait);
#ifdef SERIAL_DEBUG_OPEN
printk("block_til_ready before block: %s, count = %d\n",
tty->name, info->count);/**/
#endif
info->count--;
#ifdef SERIAL_DEBUG_COUNT
printk("cyc: %d: decrementing count to %d\n", __LINE__, info->count);
#endif
info->blocked_open++;
channel = info->line;
while (1) {
local_irq_save(flags);
base_addr[CyCAR] = (u_char)channel;
base_addr[CyMSVR1] = CyRTS;
/* CP('S');CP('4'); */
base_addr[CyMSVR2] = CyDTR;
#ifdef SERIAL_DEBUG_DTR
printk("cyc: %d: raising DTR\n", __LINE__);
printk(" status: 0x%x, 0x%x\n", base_addr[CyMSVR1], base_addr[CyMSVR2]);
#endif
local_irq_restore(flags);
set_current_state(TASK_INTERRUPTIBLE);
if (tty_hung_up_p(filp)
|| !(info->flags & ASYNC_INITIALIZED) ){
if (info->flags & ASYNC_HUP_NOTIFY) {
retval = -EAGAIN;
}else{
retval = -ERESTARTSYS;
}
break;
}
local_irq_save(flags);
base_addr[CyCAR] = (u_char)channel;
/* CP('L');CP1(1 && C_CLOCAL(tty)); CP1(1 && (base_addr[CyMSVR1] & CyDCD) ); */
if (!(info->flags & ASYNC_CLOSING)
&& (C_CLOCAL(tty)
|| (base_addr[CyMSVR1] & CyDCD))) {
local_irq_restore(flags);
break;
}
local_irq_restore(flags);
if (signal_pending(current)) {
retval = -ERESTARTSYS;
break;
}
#ifdef SERIAL_DEBUG_OPEN
printk("block_til_ready blocking: %s, count = %d\n",
tty->name, info->count);/**/
#endif
schedule();
}
current->state = TASK_RUNNING;
remove_wait_queue(&info->open_wait, &wait);
if (!tty_hung_up_p(filp)){
info->count++;
#ifdef SERIAL_DEBUG_COUNT
printk("cyc: %d: incrementing count to %d\n", __LINE__, info->count);
#endif
}
info->blocked_open--;
#ifdef SERIAL_DEBUG_OPEN
printk("block_til_ready after blocking: %s, count = %d\n",
tty->name, info->count);/**/
#endif
if (retval)
return retval;
info->flags |= ASYNC_NORMAL_ACTIVE;
return 0;
} /* block_til_ready */
/*
* This routine is called whenever a serial port is opened. It
* performs the serial-specific initialization for the tty structure.
*/
int
cy_open(struct tty_struct *tty, struct file * filp)
{
struct cyclades_port *info;
int retval, line;
/* CP('O'); */
line = tty->index;
if ((line < 0) || (NR_PORTS <= line)){
return -ENODEV;
}
info = &cy_port[line];
if (info->line < 0){
return -ENODEV;
}
#ifdef SERIAL_DEBUG_OTHER
printk("cy_open %s\n", tty->name); /* */
#endif
if (serial_paranoia_check(info, tty->name, "cy_open")){
return -ENODEV;
}
#ifdef SERIAL_DEBUG_OPEN
printk("cy_open %s, count = %d\n", tty->name, info->count);/**/
#endif
info->count++;
#ifdef SERIAL_DEBUG_COUNT
printk("cyc: %d: incrementing count to %d\n", __LINE__, info->count);
#endif
tty->driver_data = info;
info->tty = tty;
/*
* Start up serial port
*/
retval = startup(info);
if (retval){
return retval;
}
retval = block_til_ready(tty, filp, info);
if (retval) {
#ifdef SERIAL_DEBUG_OPEN
printk("cy_open returning after block_til_ready with %d\n",
retval);
#endif
return retval;
}
#ifdef SERIAL_DEBUG_OPEN
printk("cy_open done\n");/**/
#endif
return 0;
} /* cy_open */
/*
* ---------------------------------------------------------------------
* serial167_init() and friends
*
* serial167_init() is called at boot-time to initialize the serial driver.
* ---------------------------------------------------------------------
*/
/*
* This routine prints out the appropriate serial driver version
* number, and identifies which options were configured into this
* driver.
*/
static void
show_version(void)
{
printk("MVME166/167 cd2401 driver\n");
} /* show_version */
/* initialize chips on card -- return number of valid
chips (which is number of ports/4) */
/*
* This initialises the hardware to a reasonable state. It should
* probe the chip first so as to copy 166-Bug setup as a default for
* port 0. It initialises CMR to CyASYNC; that is never done again, so
* as to limit the number of CyINIT_CHAN commands in normal running.
*
* ... I wonder what I should do if this fails ...
*/
void
mvme167_serial_console_setup(int cflag)
{
volatile unsigned char* base_addr = (u_char *)BASE_ADDR;
int ch;
u_char spd;
u_char rcor, rbpr, badspeed = 0;
unsigned long flags;
local_irq_save(flags);
/*
* First probe channel zero of the chip, to see what speed has
* been selected.
*/
base_addr[CyCAR] = 0;
rcor = base_addr[CyRCOR] << 5;
rbpr = base_addr[CyRBPR];
for (spd = 0; spd < sizeof(baud_bpr); spd++)
if (rbpr == baud_bpr[spd] && rcor == baud_co[spd])
break;
if (spd >= sizeof(baud_bpr)) {
spd = 14; /* 19200 */
badspeed = 1; /* Failed to identify speed */
}
initial_console_speed = spd;
/* OK, we have chosen a speed, now reset and reinitialise */
my_udelay(20000L); /* Allow time for any active o/p to complete */
if(base_addr[CyCCR] != 0x00){
local_irq_restore(flags);
/* printk(" chip is never idle (CCR != 0)\n"); */
return;
}
base_addr[CyCCR] = CyCHIP_RESET; /* Reset the chip */
my_udelay(1000L);
if(base_addr[CyGFRCR] == 0x00){
local_irq_restore(flags);
/* printk(" chip is not responding (GFRCR stayed 0)\n"); */
return;
}
/*
* System clock is 20Mhz, divided by 2048, so divide by 10 for a 1.0ms
* tick
*/
base_addr[CyTPR] = 10;
base_addr[CyPILR1] = 0x01; /* Interrupt level for modem change */
base_addr[CyPILR2] = 0x02; /* Interrupt level for tx ints */
base_addr[CyPILR3] = 0x03; /* Interrupt level for rx ints */
/*
* Attempt to set up all channels to something reasonable, and
* bang out a INIT_CHAN command. We should then be able to limit
* the ammount of fiddling we have to do in normal running.
*/
for (ch = 3; ch >= 0 ; ch--) {
base_addr[CyCAR] = (u_char)ch;
base_addr[CyIER] = 0;
base_addr[CyCMR] = CyASYNC;
base_addr[CyLICR] = (u_char)ch << 2;
base_addr[CyLIVR] = 0x5c;
base_addr[CyTCOR] = baud_co[spd];
base_addr[CyTBPR] = baud_bpr[spd];
base_addr[CyRCOR] = baud_co[spd] >> 5;
base_addr[CyRBPR] = baud_bpr[spd];
base_addr[CySCHR1] = 'Q' & 0x1f;
base_addr[CySCHR2] = 'X' & 0x1f;
base_addr[CySCRL] = 0;
base_addr[CySCRH] = 0;
base_addr[CyCOR1] = Cy_8_BITS | CyPARITY_NONE;
base_addr[CyCOR2] = 0;
base_addr[CyCOR3] = Cy_1_STOP;
base_addr[CyCOR4] = baud_cor4[spd];
base_addr[CyCOR5] = 0;
base_addr[CyCOR6] = 0;
base_addr[CyCOR7] = 0;
base_addr[CyRTPRL] = 2;
base_addr[CyRTPRH] = 0;
base_addr[CyMSVR1] = 0;
base_addr[CyMSVR2] = 0;
write_cy_cmd(base_addr,CyINIT_CHAN|CyDIS_RCVR|CyDIS_XMTR);
}
/*
* Now do specials for channel zero....
*/
base_addr[CyMSVR1] = CyRTS;
base_addr[CyMSVR2] = CyDTR;
base_addr[CyIER] = CyRxData;
write_cy_cmd(base_addr,CyENB_RCVR|CyENB_XMTR);
local_irq_restore(flags);
my_udelay(20000L); /* Let it all settle down */
printk("CD2401 initialised, chip is rev 0x%02x\n", base_addr[CyGFRCR]);
if (badspeed)
printk(" WARNING: Failed to identify line speed, rcor=%02x,rbpr=%02x\n",
rcor >> 5, rbpr);
} /* serial_console_init */
[PATCH] const struct tty_operations As part of an SMP cleanliness pass over UML, I consted a bunch of structures in order to not have to document their locking. One of these structures was a struct tty_operations. In order to const it in UML without introducing compiler complaints, the declaration of tty_set_operations needs to be changed, and then all of its callers need to be fixed. This patch declares all struct tty_operations in the tree as const. In all cases, they are static and used only as input to tty_set_operations. As an extra check, I ran an i386 allyesconfig build which produced no extra warnings. 53 drivers are affected. I checked the history of a bunch of them, and in most cases, there have been only a handful of maintenance changes in the last six months. serial_core.c was the busiest one that I looked at. Signed-off-by: Jeff Dike <jdike@addtoit.com> Acked-by: Alan Cox <alan@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-10-02 17:17:18 +08:00
static const struct tty_operations cy_ops = {
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
.open = cy_open,
.close = cy_close,
.write = cy_write,
.put_char = cy_put_char,
.flush_chars = cy_flush_chars,
.write_room = cy_write_room,
.chars_in_buffer = cy_chars_in_buffer,
.flush_buffer = cy_flush_buffer,
.ioctl = cy_ioctl,
.throttle = cy_throttle,
.unthrottle = cy_unthrottle,
.set_termios = cy_set_termios,
.stop = cy_stop,
.start = cy_start,
.hangup = cy_hangup,
.tiocmget = cy_tiocmget,
.tiocmset = cy_tiocmset,
};
/* The serial driver boot-time initialization code!
Hardware I/O ports are mapped to character special devices on a
first found, first allocated manner. That is, this code searches
for Cyclom cards in the system. As each is found, it is probed
to discover how many chips (and thus how many ports) are present.
These ports are mapped to the tty ports 64 and upward in monotonic
fashion. If an 8-port card is replaced with a 16-port card, the
port mapping on a following card will shift.
This approach is different from what is used in the other serial
device driver because the Cyclom is more properly a multiplexer,
not just an aggregation of serial ports on one card.
If there are more cards with more ports than have been statically
allocated above, a warning is printed and the extra ports are ignored.
*/
static int __init
serial167_init(void)
{
struct cyclades_port *info;
int ret = 0;
int good_ports = 0;
int port_num = 0;
int index;
int DefSpeed;
#ifdef notyet
struct sigaction sa;
#endif
if (!(mvme16x_config &MVME16x_CONFIG_GOT_CD2401))
return 0;
cy_serial_driver = alloc_tty_driver(NR_PORTS);
if (!cy_serial_driver)
return -ENOMEM;
#if 0
scrn[1] = '\0';
#endif
show_version();
/* Has "console=0,9600n8" been used in bootinfo to change speed? */
if (serial_console_cflag)
DefSpeed = serial_console_cflag & 0017;
else {
DefSpeed = initial_console_speed;
serial_console_info = &cy_port[0];
serial_console_cflag = DefSpeed | CS8;
#if 0
serial_console = 64; /*callout_driver.minor_start*/
#endif
}
/* Initialize the tty_driver structure */
cy_serial_driver->owner = THIS_MODULE;
cy_serial_driver->name = "ttyS";
cy_serial_driver->major = TTY_MAJOR;
cy_serial_driver->minor_start = 64;
cy_serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
cy_serial_driver->subtype = SERIAL_TYPE_NORMAL;
cy_serial_driver->init_termios = tty_std_termios;
cy_serial_driver->init_termios.c_cflag =
B9600 | CS8 | CREAD | HUPCL | CLOCAL;
cy_serial_driver->flags = TTY_DRIVER_REAL_RAW;
tty_set_operations(cy_serial_driver, &cy_ops);
ret = tty_register_driver(cy_serial_driver);
if (ret) {
printk(KERN_ERR "Couldn't register MVME166/7 serial driver\n");
put_tty_driver(cy_serial_driver);
return ret;
}
port_num = 0;
info = cy_port;
for (index = 0; index < 1; index++) {
good_ports = 4;
if(port_num < NR_PORTS){
while( good_ports-- && port_num < NR_PORTS){
/*** initialize port ***/
info->magic = CYCLADES_MAGIC;
info->type = PORT_CIRRUS;
info->card = index;
info->line = port_num;
info->flags = STD_COM_FLAGS;
info->tty = 0;
info->xmit_fifo_size = 12;
info->cor1 = CyPARITY_NONE|Cy_8_BITS;
info->cor2 = CyETC;
info->cor3 = Cy_1_STOP;
info->cor4 = 0x08; /* _very_ small receive threshold */
info->cor5 = 0;
info->cor6 = 0;
info->cor7 = 0;
info->tbpr = baud_bpr[DefSpeed]; /* Tx BPR */
info->tco = baud_co[DefSpeed]; /* Tx CO */
info->rbpr = baud_bpr[DefSpeed]; /* Rx BPR */
info->rco = baud_co[DefSpeed] >> 5; /* Rx CO */
info->close_delay = 0;
info->x_char = 0;
info->event = 0;
info->count = 0;
#ifdef SERIAL_DEBUG_COUNT
printk("cyc: %d: setting count to 0\n", __LINE__);
#endif
info->blocked_open = 0;
info->default_threshold = 0;
info->default_timeout = 0;
INIT_WORK(&info->tqueue, do_softint, info);
init_waitqueue_head(&info->open_wait);
init_waitqueue_head(&info->close_wait);
/* info->session */
/* info->pgrp */
/*** !!!!!!!! this may expose new bugs !!!!!!!!! *********/
info->read_status_mask = CyTIMEOUT| CySPECHAR| CyBREAK
| CyPARITY| CyFRAME| CyOVERRUN;
/* info->timeout */
printk("ttyS%d ", info->line);
port_num++;info++;
if(!(port_num & 7)){
printk("\n ");
}
}
}
printk("\n");
}
while( port_num < NR_PORTS){
info->line = -1;
port_num++;info++;
}
#ifdef CONFIG_REMOTE_DEBUG
debug_setup();
#endif
ret = request_irq(MVME167_IRQ_SER_ERR, cd2401_rxerr_interrupt, 0,
"cd2401_errors", cd2401_rxerr_interrupt);
if (ret) {
printk(KERN_ERR "Could't get cd2401_errors IRQ");
goto cleanup_serial_driver;
}
ret = request_irq(MVME167_IRQ_SER_MODEM, cd2401_modem_interrupt, 0,
"cd2401_modem", cd2401_modem_interrupt);
if (ret) {
printk(KERN_ERR "Could't get cd2401_modem IRQ");
goto cleanup_irq_cd2401_errors;
}
ret = request_irq(MVME167_IRQ_SER_TX, cd2401_tx_interrupt, 0,
"cd2401_txints", cd2401_tx_interrupt);
if (ret) {
printk(KERN_ERR "Could't get cd2401_txints IRQ");
goto cleanup_irq_cd2401_modem;
}
ret = request_irq(MVME167_IRQ_SER_RX, cd2401_rx_interrupt, 0,
"cd2401_rxints", cd2401_rx_interrupt);
if (ret) {
printk(KERN_ERR "Could't get cd2401_rxints IRQ");
goto cleanup_irq_cd2401_txints;
}
/* Now we have registered the interrupt handlers, allow the interrupts */
pcc2chip[PccSCCMICR] = 0x15; /* Serial ints are level 5 */
pcc2chip[PccSCCTICR] = 0x15;
pcc2chip[PccSCCRICR] = 0x15;
pcc2chip[PccIMLR] = 3; /* Allow PCC2 ints above 3!? */
return 0;
cleanup_irq_cd2401_txints:
free_irq(MVME167_IRQ_SER_TX, cd2401_tx_interrupt);
cleanup_irq_cd2401_modem:
free_irq(MVME167_IRQ_SER_MODEM, cd2401_modem_interrupt);
cleanup_irq_cd2401_errors:
free_irq(MVME167_IRQ_SER_ERR, cd2401_rxerr_interrupt);
cleanup_serial_driver:
if (tty_unregister_driver(cy_serial_driver))
printk(KERN_ERR "Couldn't unregister MVME166/7 serial driver\n");
put_tty_driver(cy_serial_driver);
return ret;
} /* serial167_init */
module_init(serial167_init);
#ifdef CYCLOM_SHOW_STATUS
static void
show_status(int line_num)
{
volatile unsigned char *base_addr = (u_char *)BASE_ADDR;
int channel;
struct cyclades_port * info;
unsigned long flags;
info = &cy_port[line_num];
channel = info->line;
printk(" channel %d\n", channel);/**/
printk(" cy_port\n");
printk(" card line flags = %d %d %x\n",
info->card, info->line, info->flags);
printk(" *tty read_status_mask timeout xmit_fifo_size = %lx %x %x %x\n",
(long)info->tty, info->read_status_mask,
info->timeout, info->xmit_fifo_size);
printk(" cor1,cor2,cor3,cor4,cor5,cor6,cor7 = %x %x %x %x %x %x %x\n",
info->cor1, info->cor2, info->cor3, info->cor4, info->cor5,
info->cor6, info->cor7);
printk(" tbpr,tco,rbpr,rco = %d %d %d %d\n",
info->tbpr, info->tco, info->rbpr, info->rco);
printk(" close_delay event count = %d %d %d\n",
info->close_delay, info->event, info->count);
printk(" x_char blocked_open = %x %x\n",
info->x_char, info->blocked_open);
printk(" open_wait = %lx %lx %lx\n",
(long)info->open_wait);
local_irq_save(flags);
/* Global Registers */
printk(" CyGFRCR %x\n", base_addr[CyGFRCR]);
printk(" CyCAR %x\n", base_addr[CyCAR]);
printk(" CyRISR %x\n", base_addr[CyRISR]);
printk(" CyTISR %x\n", base_addr[CyTISR]);
printk(" CyMISR %x\n", base_addr[CyMISR]);
printk(" CyRIR %x\n", base_addr[CyRIR]);
printk(" CyTIR %x\n", base_addr[CyTIR]);
printk(" CyMIR %x\n", base_addr[CyMIR]);
printk(" CyTPR %x\n", base_addr[CyTPR]);
base_addr[CyCAR] = (u_char)channel;
/* Virtual Registers */
#if 0
printk(" CyRIVR %x\n", base_addr[CyRIVR]);
printk(" CyTIVR %x\n", base_addr[CyTIVR]);
printk(" CyMIVR %x\n", base_addr[CyMIVR]);
printk(" CyMISR %x\n", base_addr[CyMISR]);
#endif
/* Channel Registers */
printk(" CyCCR %x\n", base_addr[CyCCR]);
printk(" CyIER %x\n", base_addr[CyIER]);
printk(" CyCOR1 %x\n", base_addr[CyCOR1]);
printk(" CyCOR2 %x\n", base_addr[CyCOR2]);
printk(" CyCOR3 %x\n", base_addr[CyCOR3]);
printk(" CyCOR4 %x\n", base_addr[CyCOR4]);
printk(" CyCOR5 %x\n", base_addr[CyCOR5]);
#if 0
printk(" CyCCSR %x\n", base_addr[CyCCSR]);
printk(" CyRDCR %x\n", base_addr[CyRDCR]);
#endif
printk(" CySCHR1 %x\n", base_addr[CySCHR1]);
printk(" CySCHR2 %x\n", base_addr[CySCHR2]);
#if 0
printk(" CySCHR3 %x\n", base_addr[CySCHR3]);
printk(" CySCHR4 %x\n", base_addr[CySCHR4]);
printk(" CySCRL %x\n", base_addr[CySCRL]);
printk(" CySCRH %x\n", base_addr[CySCRH]);
printk(" CyLNC %x\n", base_addr[CyLNC]);
printk(" CyMCOR1 %x\n", base_addr[CyMCOR1]);
printk(" CyMCOR2 %x\n", base_addr[CyMCOR2]);
#endif
printk(" CyRTPRL %x\n", base_addr[CyRTPRL]);
printk(" CyRTPRH %x\n", base_addr[CyRTPRH]);
printk(" CyMSVR1 %x\n", base_addr[CyMSVR1]);
printk(" CyMSVR2 %x\n", base_addr[CyMSVR2]);
printk(" CyRBPR %x\n", base_addr[CyRBPR]);
printk(" CyRCOR %x\n", base_addr[CyRCOR]);
printk(" CyTBPR %x\n", base_addr[CyTBPR]);
printk(" CyTCOR %x\n", base_addr[CyTCOR]);
local_irq_restore(flags);
} /* show_status */
#endif
#if 0
/* Dummy routine in mvme16x/config.c for now */
/* Serial console setup. Called from linux/init/main.c */
void console_setup(char *str, int *ints)
{
char *s;
int baud, bits, parity;
int cflag = 0;
/* Sanity check. */
if (ints[0] > 3 || ints[1] > 3) return;
/* Get baud, bits and parity */
baud = 2400;
bits = 8;
parity = 'n';
if (ints[2]) baud = ints[2];
if ((s = strchr(str, ','))) {
do {
s++;
} while(*s >= '0' && *s <= '9');
if (*s) parity = *s++;
if (*s) bits = *s - '0';
}
/* Now construct a cflag setting. */
switch(baud) {
case 1200:
cflag |= B1200;
break;
case 9600:
cflag |= B9600;
break;
case 19200:
cflag |= B19200;
break;
case 38400:
cflag |= B38400;
break;
case 2400:
default:
cflag |= B2400;
break;
}
switch(bits) {
case 7:
cflag |= CS7;
break;
default:
case 8:
cflag |= CS8;
break;
}
switch(parity) {
case 'o': case 'O':
cflag |= PARODD;
break;
case 'e': case 'E':
cflag |= PARENB;
break;
}
serial_console_info = &cy_port[ints[1]];
serial_console_cflag = cflag;
serial_console = ints[1] + 64; /*callout_driver.minor_start*/
}
#endif
/*
* The following is probably out of date for 2.1.x serial console stuff.
*
* The console is registered early on from arch/m68k/kernel/setup.c, and
* it therefore relies on the chip being setup correctly by 166-Bug. This
* seems reasonable, as the serial port has been used to invoke the system
* boot. It also means that this function must not rely on any data
* initialisation performed by serial167_init() etc.
*
* Of course, once the console has been registered, we had better ensure
* that serial167_init() doesn't leave the chip non-functional.
*
* The console must be locked when we get here.
*/
void serial167_console_write(struct console *co, const char *str, unsigned count)
{
volatile unsigned char *base_addr = (u_char *)BASE_ADDR;
unsigned long flags;
volatile u_char sink;
u_char ier;
int port;
u_char do_lf = 0;
int i = 0;
local_irq_save(flags);
/* Ensure transmitter is enabled! */
port = 0;
base_addr[CyCAR] = (u_char)port;
while (base_addr[CyCCR])
;
base_addr[CyCCR] = CyENB_XMTR;
ier = base_addr[CyIER];
base_addr[CyIER] = CyTxMpty;
while (1) {
if (pcc2chip[PccSCCTICR] & 0x20)
{
/* We have a Tx int. Acknowledge it */
sink = pcc2chip[PccTPIACKR];
if ((base_addr[CyLICR] >> 2) == port) {
if (i == count) {
/* Last char of string is now output */
base_addr[CyTEOIR] = CyNOTRANS;
break;
}
if (do_lf) {
base_addr[CyTDR] = '\n';
str++;
i++;
do_lf = 0;
}
else if (*str == '\n') {
base_addr[CyTDR] = '\r';
do_lf = 1;
}
else {
base_addr[CyTDR] = *str++;
i++;
}
base_addr[CyTEOIR] = 0;
}
else
base_addr[CyTEOIR] = CyNOTRANS;
}
}
base_addr[CyIER] = ier;
local_irq_restore(flags);
}
static struct tty_driver *serial167_console_device(struct console *c, int *index)
{
*index = c->index;
return cy_serial_driver;
}
static int __init serial167_console_setup(struct console *co, char *options)
{
return 0;
}
static struct console sercons = {
.name = "ttyS",
.write = serial167_console_write,
.device = serial167_console_device,
.setup = serial167_console_setup,
.flags = CON_PRINTBUFFER,
.index = -1,
};
static int __init serial167_console_init(void)
{
if (vme_brdtype == VME_TYPE_MVME166 ||
vme_brdtype == VME_TYPE_MVME167 ||
vme_brdtype == VME_TYPE_MVME177) {
mvme167_serial_console_setup(0);
register_console(&sercons);
}
return 0;
}
console_initcall(serial167_console_init);
#ifdef CONFIG_REMOTE_DEBUG
void putDebugChar (int c)
{
volatile unsigned char *base_addr = (u_char *)BASE_ADDR;
unsigned long flags;
volatile u_char sink;
u_char ier;
int port;
local_irq_save(flags);
/* Ensure transmitter is enabled! */
port = DEBUG_PORT;
base_addr[CyCAR] = (u_char)port;
while (base_addr[CyCCR])
;
base_addr[CyCCR] = CyENB_XMTR;
ier = base_addr[CyIER];
base_addr[CyIER] = CyTxMpty;
while (1) {
if (pcc2chip[PccSCCTICR] & 0x20)
{
/* We have a Tx int. Acknowledge it */
sink = pcc2chip[PccTPIACKR];
if ((base_addr[CyLICR] >> 2) == port) {
base_addr[CyTDR] = c;
base_addr[CyTEOIR] = 0;
break;
}
else
base_addr[CyTEOIR] = CyNOTRANS;
}
}
base_addr[CyIER] = ier;
local_irq_restore(flags);
}
int getDebugChar()
{
volatile unsigned char *base_addr = (u_char *)BASE_ADDR;
unsigned long flags;
volatile u_char sink;
u_char ier;
int port;
int i, c;
i = debugiq.out;
if (i != debugiq.in) {
c = debugiq.buf[i];
if (++i == DEBUG_LEN)
i = 0;
debugiq.out = i;
return c;
}
/* OK, nothing in queue, wait in poll loop */
local_irq_save(flags);
/* Ensure receiver is enabled! */
port = DEBUG_PORT;
base_addr[CyCAR] = (u_char)port;
#if 0
while (base_addr[CyCCR])
;
base_addr[CyCCR] = CyENB_RCVR;
#endif
ier = base_addr[CyIER];
base_addr[CyIER] = CyRxData;
while (1) {
if (pcc2chip[PccSCCRICR] & 0x20)
{
/* We have a Rx int. Acknowledge it */
sink = pcc2chip[PccRPIACKR];
if ((base_addr[CyLICR] >> 2) == port) {
int cnt = base_addr[CyRFOC];
while (cnt-- > 0)
{
c = base_addr[CyRDR];
if (c == 0)
printk ("!! debug char is null (cnt=%d) !!", cnt);
else
queueDebugChar (c);
}
base_addr[CyREOIR] = 0;
i = debugiq.out;
if (i == debugiq.in)
panic ("Debug input queue empty!");
c = debugiq.buf[i];
if (++i == DEBUG_LEN)
i = 0;
debugiq.out = i;
break;
}
else
base_addr[CyREOIR] = CyNOTRANS;
}
}
base_addr[CyIER] = ier;
local_irq_restore(flags);
return (c);
}
void queueDebugChar (int c)
{
int i;
i = debugiq.in;
debugiq.buf[i] = c;
if (++i == DEBUG_LEN)
i = 0;
if (i != debugiq.out)
debugiq.in = i;
}
static void
debug_setup()
{
unsigned long flags;
volatile unsigned char *base_addr = (u_char *)BASE_ADDR;
int i, cflag;
cflag = B19200;
local_irq_save(flags);
for (i = 0; i < 4; i++)
{
base_addr[CyCAR] = i;
base_addr[CyLICR] = i << 2;
}
debugiq.in = debugiq.out = 0;
base_addr[CyCAR] = DEBUG_PORT;
/* baud rate */
i = cflag & CBAUD;
base_addr[CyIER] = 0;
base_addr[CyCMR] = CyASYNC;
base_addr[CyLICR] = DEBUG_PORT << 2;
base_addr[CyLIVR] = 0x5c;
/* tx and rx baud rate */
base_addr[CyTCOR] = baud_co[i];
base_addr[CyTBPR] = baud_bpr[i];
base_addr[CyRCOR] = baud_co[i] >> 5;
base_addr[CyRBPR] = baud_bpr[i];
/* set line characteristics according configuration */
base_addr[CySCHR1] = 0;
base_addr[CySCHR2] = 0;
base_addr[CySCRL] = 0;
base_addr[CySCRH] = 0;
base_addr[CyCOR1] = Cy_8_BITS | CyPARITY_NONE;
base_addr[CyCOR2] = 0;
base_addr[CyCOR3] = Cy_1_STOP;
base_addr[CyCOR4] = baud_cor4[i];
base_addr[CyCOR5] = 0;
base_addr[CyCOR6] = 0;
base_addr[CyCOR7] = 0;
write_cy_cmd(base_addr,CyINIT_CHAN);
write_cy_cmd(base_addr,CyENB_RCVR);
base_addr[CyCAR] = DEBUG_PORT; /* !!! Is this needed? */
base_addr[CyRTPRL] = 2;
base_addr[CyRTPRH] = 0;
base_addr[CyMSVR1] = CyRTS;
base_addr[CyMSVR2] = CyDTR;
base_addr[CyIER] = CyRxData;
local_irq_restore(flags);
} /* debug_setup */
#endif
MODULE_LICENSE("GPL");
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