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linux/drivers/isdn/hardware/avm/avmcard.h
David Howells 7d12e780e0 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 15:10:12 +01:00

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/* $Id: avmcard.h,v 1.1.4.1.2.1 2001/12/21 15:00:17 kai Exp $
*
* Copyright 1999 by Carsten Paeth <calle@calle.de>
*
* This software may be used and distributed according to the terms
* of the GNU General Public License, incorporated herein by reference.
*
*/
#ifndef _AVMCARD_H_
#define _AVMCARD_H_
#include <linux/spinlock.h>
#include <linux/list.h>
#include <linux/interrupt.h>
#define AVMB1_PORTLEN 0x1f
#define AVM_MAXVERSION 8
#define AVM_NCCI_PER_CHANNEL 4
/*
* Versions
*/
#define VER_DRIVER 0
#define VER_CARDTYPE 1
#define VER_HWID 2
#define VER_SERIAL 3
#define VER_OPTION 4
#define VER_PROTO 5
#define VER_PROFILE 6
#define VER_CAPI 7
enum avmcardtype {
avm_b1isa,
avm_b1pci,
avm_b1pcmcia,
avm_m1,
avm_m2,
avm_t1isa,
avm_t1pci,
avm_c4,
avm_c2
};
typedef struct avmcard_dmabuf {
long size;
u8 *dmabuf;
dma_addr_t dmaaddr;
} avmcard_dmabuf;
typedef struct avmcard_dmainfo {
u32 recvlen;
avmcard_dmabuf recvbuf;
avmcard_dmabuf sendbuf;
struct sk_buff_head send_queue;
struct pci_dev *pcidev;
} avmcard_dmainfo;
typedef struct avmctrl_info {
char cardname[32];
int versionlen;
char versionbuf[1024];
char *version[AVM_MAXVERSION];
char infobuf[128]; /* for function procinfo */
struct avmcard *card;
struct capi_ctr capi_ctrl;
struct list_head ncci_head;
} avmctrl_info;
typedef struct avmcard {
char name[32];
spinlock_t lock;
unsigned int port;
unsigned irq;
unsigned long membase;
enum avmcardtype cardtype;
unsigned char revision;
unsigned char class;
int cardnr; /* for t1isa */
char msgbuf[128]; /* capimsg msg part */
char databuf[2048]; /* capimsg data part */
void __iomem *mbase;
volatile u32 csr;
avmcard_dmainfo *dma;
struct avmctrl_info *ctrlinfo;
u_int nr_controllers;
u_int nlogcontr;
struct list_head list;
} avmcard;
extern int b1_irq_table[16];
/*
* LLI Messages to the ISDN-ControllerISDN Controller
*/
#define SEND_POLL 0x72 /*
* after load <- RECEIVE_POLL
*/
#define SEND_INIT 0x11 /*
* first message <- RECEIVE_INIT
* int32 NumApplications int32
* NumNCCIs int32 BoardNumber
*/
#define SEND_REGISTER 0x12 /*
* register an application int32
* ApplIDId int32 NumMessages
* int32 NumB3Connections int32
* NumB3Blocks int32 B3Size
*
* AnzB3Connection != 0 &&
* AnzB3Blocks >= 1 && B3Size >= 1
*/
#define SEND_RELEASE 0x14 /*
* deregister an application int32
* ApplID
*/
#define SEND_MESSAGE 0x15 /*
* send capi-message int32 length
* capi-data ...
*/
#define SEND_DATA_B3_REQ 0x13 /*
* send capi-data-message int32
* MsgLength capi-data ... int32
* B3Length data ....
*/
#define SEND_CONFIG 0x21 /*
*/
#define SEND_POLLACK 0x73 /* T1 Watchdog */
/*
* LLI Messages from the ISDN-ControllerISDN Controller
*/
#define RECEIVE_POLL 0x32 /*
* <- after SEND_POLL
*/
#define RECEIVE_INIT 0x27 /*
* <- after SEND_INIT int32 length
* byte total length b1struct board
* driver revision b1struct card
* type b1struct reserved b1struct
* serial number b1struct driver
* capability b1struct d-channel
* protocol b1struct CAPI-2.0
* profile b1struct capi version
*/
#define RECEIVE_MESSAGE 0x21 /*
* <- after SEND_MESSAGE int32
* AppllID int32 Length capi-data
* ....
*/
#define RECEIVE_DATA_B3_IND 0x22 /*
* received data int32 AppllID
* int32 Length capi-data ...
* int32 B3Length data ...
*/
#define RECEIVE_START 0x23 /*
* Handshake
*/
#define RECEIVE_STOP 0x24 /*
* Handshake
*/
#define RECEIVE_NEW_NCCI 0x25 /*
* int32 AppllID int32 NCCI int32
* WindowSize
*/
#define RECEIVE_FREE_NCCI 0x26 /*
* int32 AppllID int32 NCCI
*/
#define RECEIVE_RELEASE 0x26 /*
* int32 AppllID int32 0xffffffff
*/
#define RECEIVE_TASK_READY 0x31 /*
* int32 tasknr
* int32 Length Taskname ...
*/
#define RECEIVE_DEBUGMSG 0x71 /*
* int32 Length message
*
*/
#define RECEIVE_POLLDWORD 0x75 /* t1pci in dword mode */
#define WRITE_REGISTER 0x00
#define READ_REGISTER 0x01
/*
* port offsets
*/
#define B1_READ 0x00
#define B1_WRITE 0x01
#define B1_INSTAT 0x02
#define B1_OUTSTAT 0x03
#define B1_ANALYSE 0x04
#define B1_REVISION 0x05
#define B1_RESET 0x10
#define B1_STAT0(cardtype) ((cardtype) == avm_m1 ? 0x81200000l : 0x80A00000l)
#define B1_STAT1(cardtype) (0x80E00000l)
/* ---------------------------------------------------------------- */
static inline unsigned char b1outp(unsigned int base,
unsigned short offset,
unsigned char value)
{
outb(value, base + offset);
return inb(base + B1_ANALYSE);
}
static inline int b1_rx_full(unsigned int base)
{
return inb(base + B1_INSTAT) & 0x1;
}
static inline unsigned char b1_get_byte(unsigned int base)
{
unsigned long stop = jiffies + 1 * HZ; /* maximum wait time 1 sec */
while (!b1_rx_full(base) && time_before(jiffies, stop));
if (b1_rx_full(base))
return inb(base + B1_READ);
printk(KERN_CRIT "b1lli(0x%x): rx not full after 1 second\n", base);
return 0;
}
static inline unsigned int b1_get_word(unsigned int base)
{
unsigned int val = 0;
val |= b1_get_byte(base);
val |= (b1_get_byte(base) << 8);
val |= (b1_get_byte(base) << 16);
val |= (b1_get_byte(base) << 24);
return val;
}
static inline int b1_tx_empty(unsigned int base)
{
return inb(base + B1_OUTSTAT) & 0x1;
}
static inline void b1_put_byte(unsigned int base, unsigned char val)
{
while (!b1_tx_empty(base));
b1outp(base, B1_WRITE, val);
}
static inline int b1_save_put_byte(unsigned int base, unsigned char val)
{
unsigned long stop = jiffies + 2 * HZ;
while (!b1_tx_empty(base) && time_before(jiffies,stop));
if (!b1_tx_empty(base)) return -1;
b1outp(base, B1_WRITE, val);
return 0;
}
static inline void b1_put_word(unsigned int base, unsigned int val)
{
b1_put_byte(base, val & 0xff);
b1_put_byte(base, (val >> 8) & 0xff);
b1_put_byte(base, (val >> 16) & 0xff);
b1_put_byte(base, (val >> 24) & 0xff);
}
static inline unsigned int b1_get_slice(unsigned int base,
unsigned char *dp)
{
unsigned int len, i;
len = i = b1_get_word(base);
while (i-- > 0) *dp++ = b1_get_byte(base);
return len;
}
static inline void b1_put_slice(unsigned int base,
unsigned char *dp, unsigned int len)
{
unsigned i = len;
b1_put_word(base, i);
while (i-- > 0)
b1_put_byte(base, *dp++);
}
static void b1_wr_reg(unsigned int base,
unsigned int reg,
unsigned int value)
{
b1_put_byte(base, WRITE_REGISTER);
b1_put_word(base, reg);
b1_put_word(base, value);
}
static inline unsigned int b1_rd_reg(unsigned int base,
unsigned int reg)
{
b1_put_byte(base, READ_REGISTER);
b1_put_word(base, reg);
return b1_get_word(base);
}
static inline void b1_reset(unsigned int base)
{
b1outp(base, B1_RESET, 0);
mdelay(55 * 2); /* 2 TIC's */
b1outp(base, B1_RESET, 1);
mdelay(55 * 2); /* 2 TIC's */
b1outp(base, B1_RESET, 0);
mdelay(55 * 2); /* 2 TIC's */
}
static inline unsigned char b1_disable_irq(unsigned int base)
{
return b1outp(base, B1_INSTAT, 0x00);
}
/* ---------------------------------------------------------------- */
static inline void b1_set_test_bit(unsigned int base,
enum avmcardtype cardtype,
int onoff)
{
b1_wr_reg(base, B1_STAT0(cardtype), onoff ? 0x21 : 0x20);
}
static inline int b1_get_test_bit(unsigned int base,
enum avmcardtype cardtype)
{
return (b1_rd_reg(base, B1_STAT0(cardtype)) & 0x01) != 0;
}
/* ---------------------------------------------------------------- */
#define T1_FASTLINK 0x00
#define T1_SLOWLINK 0x08
#define T1_READ B1_READ
#define T1_WRITE B1_WRITE
#define T1_INSTAT B1_INSTAT
#define T1_OUTSTAT B1_OUTSTAT
#define T1_IRQENABLE 0x05
#define T1_FIFOSTAT 0x06
#define T1_RESETLINK 0x10
#define T1_ANALYSE 0x11
#define T1_IRQMASTER 0x12
#define T1_IDENT 0x17
#define T1_RESETBOARD 0x1f
#define T1F_IREADY 0x01
#define T1F_IHALF 0x02
#define T1F_IFULL 0x04
#define T1F_IEMPTY 0x08
#define T1F_IFLAGS 0xF0
#define T1F_OREADY 0x10
#define T1F_OHALF 0x20
#define T1F_OEMPTY 0x40
#define T1F_OFULL 0x80
#define T1F_OFLAGS 0xF0
/* there are HEMA cards with 1k and 4k FIFO out */
#define FIFO_OUTBSIZE 256
#define FIFO_INPBSIZE 512
#define HEMA_VERSION_ID 0
#define HEMA_PAL_ID 0
static inline void t1outp(unsigned int base,
unsigned short offset,
unsigned char value)
{
outb(value, base + offset);
}
static inline unsigned char t1inp(unsigned int base,
unsigned short offset)
{
return inb(base + offset);
}
static inline int t1_isfastlink(unsigned int base)
{
return (inb(base + T1_IDENT) & ~0x82) == 1;
}
static inline unsigned char t1_fifostatus(unsigned int base)
{
return inb(base + T1_FIFOSTAT);
}
static inline unsigned int t1_get_slice(unsigned int base,
unsigned char *dp)
{
unsigned int len, i;
#ifdef FASTLINK_DEBUG
unsigned wcnt = 0, bcnt = 0;
#endif
len = i = b1_get_word(base);
if (t1_isfastlink(base)) {
int status;
while (i > 0) {
status = t1_fifostatus(base) & (T1F_IREADY|T1F_IHALF);
if (i >= FIFO_INPBSIZE) status |= T1F_IFULL;
switch (status) {
case T1F_IREADY|T1F_IHALF|T1F_IFULL:
insb(base+B1_READ, dp, FIFO_INPBSIZE);
dp += FIFO_INPBSIZE;
i -= FIFO_INPBSIZE;
#ifdef FASTLINK_DEBUG
wcnt += FIFO_INPBSIZE;
#endif
break;
case T1F_IREADY|T1F_IHALF:
insb(base+B1_READ,dp, i);
#ifdef FASTLINK_DEBUG
wcnt += i;
#endif
dp += i;
i = 0;
break;
default:
*dp++ = b1_get_byte(base);
i--;
#ifdef FASTLINK_DEBUG
bcnt++;
#endif
break;
}
}
#ifdef FASTLINK_DEBUG
if (wcnt)
printk(KERN_DEBUG "b1lli(0x%x): get_slice l=%d w=%d b=%d\n",
base, len, wcnt, bcnt);
#endif
} else {
while (i-- > 0)
*dp++ = b1_get_byte(base);
}
return len;
}
static inline void t1_put_slice(unsigned int base,
unsigned char *dp, unsigned int len)
{
unsigned i = len;
b1_put_word(base, i);
if (t1_isfastlink(base)) {
int status;
while (i > 0) {
status = t1_fifostatus(base) & (T1F_OREADY|T1F_OHALF);
if (i >= FIFO_OUTBSIZE) status |= T1F_OEMPTY;
switch (status) {
case T1F_OREADY|T1F_OHALF|T1F_OEMPTY:
outsb(base+B1_WRITE, dp, FIFO_OUTBSIZE);
dp += FIFO_OUTBSIZE;
i -= FIFO_OUTBSIZE;
break;
case T1F_OREADY|T1F_OHALF:
outsb(base+B1_WRITE, dp, i);
dp += i;
i = 0;
break;
default:
b1_put_byte(base, *dp++);
i--;
break;
}
}
} else {
while (i-- > 0)
b1_put_byte(base, *dp++);
}
}
static inline void t1_disable_irq(unsigned int base)
{
t1outp(base, T1_IRQMASTER, 0x00);
}
static inline void t1_reset(unsigned int base)
{
/* reset T1 Controller */
b1_reset(base);
/* disable irq on HEMA */
t1outp(base, B1_INSTAT, 0x00);
t1outp(base, B1_OUTSTAT, 0x00);
t1outp(base, T1_IRQMASTER, 0x00);
/* reset HEMA board configuration */
t1outp(base, T1_RESETBOARD, 0xf);
}
static inline void b1_setinterrupt(unsigned int base, unsigned irq,
enum avmcardtype cardtype)
{
switch (cardtype) {
case avm_t1isa:
t1outp(base, B1_INSTAT, 0x00);
t1outp(base, B1_INSTAT, 0x02);
t1outp(base, T1_IRQMASTER, 0x08);
break;
case avm_b1isa:
b1outp(base, B1_INSTAT, 0x00);
b1outp(base, B1_RESET, b1_irq_table[irq]);
b1outp(base, B1_INSTAT, 0x02);
break;
default:
case avm_m1:
case avm_m2:
case avm_b1pci:
b1outp(base, B1_INSTAT, 0x00);
b1outp(base, B1_RESET, 0xf0);
b1outp(base, B1_INSTAT, 0x02);
break;
case avm_c4:
case avm_t1pci:
b1outp(base, B1_RESET, 0xf0);
break;
}
}
/* b1.c */
avmcard *b1_alloc_card(int nr_controllers);
void b1_free_card(avmcard *card);
int b1_detect(unsigned int base, enum avmcardtype cardtype);
void b1_getrevision(avmcard *card);
int b1_load_t4file(avmcard *card, capiloaddatapart * t4file);
int b1_load_config(avmcard *card, capiloaddatapart * config);
int b1_loaded(avmcard *card);
int b1_load_firmware(struct capi_ctr *ctrl, capiloaddata *data);
void b1_reset_ctr(struct capi_ctr *ctrl);
void b1_register_appl(struct capi_ctr *ctrl, u16 appl,
capi_register_params *rp);
void b1_release_appl(struct capi_ctr *ctrl, u16 appl);
u16 b1_send_message(struct capi_ctr *ctrl, struct sk_buff *skb);
void b1_parse_version(avmctrl_info *card);
irqreturn_t b1_interrupt(int interrupt, void *devptr);
int b1ctl_read_proc(char *page, char **start, off_t off,
int count, int *eof, struct capi_ctr *ctrl);
avmcard_dmainfo *avmcard_dma_alloc(char *name, struct pci_dev *,
long rsize, long ssize);
void avmcard_dma_free(avmcard_dmainfo *);
/* b1dma.c */
int b1pciv4_detect(avmcard *card);
int t1pci_detect(avmcard *card);
void b1dma_reset(avmcard *card);
irqreturn_t b1dma_interrupt(int interrupt, void *devptr);
int b1dma_load_firmware(struct capi_ctr *ctrl, capiloaddata *data);
void b1dma_reset_ctr(struct capi_ctr *ctrl);
void b1dma_remove_ctr(struct capi_ctr *ctrl);
void b1dma_register_appl(struct capi_ctr *ctrl,
u16 appl,
capi_register_params *rp);
void b1dma_release_appl(struct capi_ctr *ctrl, u16 appl);
u16 b1dma_send_message(struct capi_ctr *ctrl, struct sk_buff *skb);
int b1dmactl_read_proc(char *page, char **start, off_t off,
int count, int *eof, struct capi_ctr *ctrl);
#endif /* _AVMCARD_H_ */
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