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linux/drivers/isdn/hysdn/boardergo.c
Al Viro 3e577a80ea [PATCH] drivers/{char|isdn}: work_struct-induced breakage 
part 1 of fsck-knows-how-many

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-12-06 11:09:08 -08:00

451 lines
16 KiB
C
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/* $Id: boardergo.c,v 1.5.6.7 2001/11/06 21:58:19 kai Exp $
*
* Linux driver for HYSDN cards, specific routines for ergo type boards.
*
* Author Werner Cornelius (werner@titro.de) for Hypercope GmbH
* Copyright 1999 by Werner Cornelius (werner@titro.de)
*
* This software may be used and distributed according to the terms
* of the GNU General Public License, incorporated herein by reference.
*
* As all Linux supported cards Champ2, Ergo and Metro2/4 use the same
* DPRAM interface and layout with only minor differences all related
* stuff is done here, not in separate modules.
*
*/
#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/vmalloc.h>
#include <linux/delay.h>
#include <asm/io.h>
#include "hysdn_defs.h"
#include "boardergo.h"
#define byteout(addr,val) outb(val,addr)
#define bytein(addr) inb(addr)
/***************************************************/
/* The cards interrupt handler. Called from system */
/***************************************************/
static irqreturn_t
ergo_interrupt(int intno, void *dev_id)
{
hysdn_card *card = dev_id; /* parameter from irq */
tErgDpram *dpr;
unsigned long flags;
unsigned char volatile b;
if (!card)
return IRQ_NONE; /* error -> spurious interrupt */
if (!card->irq_enabled)
return IRQ_NONE; /* other device interrupting or irq switched off */
spin_lock_irqsave(&card->hysdn_lock, flags); /* no further irqs allowed */
if (!(bytein(card->iobase + PCI9050_INTR_REG) & PCI9050_INTR_REG_STAT1)) {
spin_unlock_irqrestore(&card->hysdn_lock, flags); /* restore old state */
return IRQ_NONE; /* no interrupt requested by E1 */
}
/* clear any pending ints on the board */
dpr = card->dpram;
b = dpr->ToPcInt; /* clear for ergo */
b |= dpr->ToPcIntMetro; /* same for metro */
b |= dpr->ToHyInt; /* and for champ */
/* start kernel task immediately after leaving all interrupts */
if (!card->hw_lock)
schedule_work(&card->irq_queue);
spin_unlock_irqrestore(&card->hysdn_lock, flags);
return IRQ_HANDLED;
} /* ergo_interrupt */
/******************************************************************************/
/* ergo_irq_bh is the function called by the immediate kernel task list after */
/* being activated with queue_task and no interrupts active. This task is the */
/* only one handling data transfer from or to the card after booting. The task */
/* may be queued from everywhere (interrupts included). */
/******************************************************************************/
static void
ergo_irq_bh(struct work_struct *ugli_api)
{
hysdn_card * card = container_of(ugli_api, hysdn_card, irq_queue);
tErgDpram *dpr;
int again;
unsigned long flags;
if (card->state != CARD_STATE_RUN)
return; /* invalid call */
dpr = card->dpram; /* point to DPRAM */
spin_lock_irqsave(&card->hysdn_lock, flags);
if (card->hw_lock) {
spin_unlock_irqrestore(&card->hysdn_lock, flags); /* hardware currently unavailable */
return;
}
card->hw_lock = 1; /* we now lock the hardware */
do {
sti(); /* reenable other ints */
again = 0; /* assume loop not to be repeated */
if (!dpr->ToHyFlag) {
/* we are able to send a buffer */
if (hysdn_sched_tx(card, dpr->ToHyBuf, &dpr->ToHySize, &dpr->ToHyChannel,
ERG_TO_HY_BUF_SIZE)) {
dpr->ToHyFlag = 1; /* enable tx */
again = 1; /* restart loop */
}
} /* we are able to send a buffer */
if (dpr->ToPcFlag) {
/* a message has arrived for us, handle it */
if (hysdn_sched_rx(card, dpr->ToPcBuf, dpr->ToPcSize, dpr->ToPcChannel)) {
dpr->ToPcFlag = 0; /* we worked the data */
again = 1; /* restart loop */
}
} /* a message has arrived for us */
cli(); /* no further ints */
if (again) {
dpr->ToHyInt = 1;
dpr->ToPcInt = 1; /* interrupt to E1 for all cards */
} else
card->hw_lock = 0; /* free hardware again */
} while (again); /* until nothing more to do */
spin_unlock_irqrestore(&card->hysdn_lock, flags);
} /* ergo_irq_bh */
/*********************************************************/
/* stop the card (hardware reset) and disable interrupts */
/*********************************************************/
static void
ergo_stopcard(hysdn_card * card)
{
unsigned long flags;
unsigned char val;
hysdn_net_release(card); /* first release the net device if existing */
#ifdef CONFIG_HYSDN_CAPI
hycapi_capi_stop(card);
#endif /* CONFIG_HYSDN_CAPI */
spin_lock_irqsave(&card->hysdn_lock, flags);
val = bytein(card->iobase + PCI9050_INTR_REG); /* get actual value */
val &= ~(PCI9050_INTR_REG_ENPCI | PCI9050_INTR_REG_EN1); /* mask irq */
byteout(card->iobase + PCI9050_INTR_REG, val);
card->irq_enabled = 0;
byteout(card->iobase + PCI9050_USER_IO, PCI9050_E1_RESET); /* reset E1 processor */
card->state = CARD_STATE_UNUSED;
card->err_log_state = ERRLOG_STATE_OFF; /* currently no log active */
spin_unlock_irqrestore(&card->hysdn_lock, flags);
} /* ergo_stopcard */
/**************************************************************************/
/* enable or disable the cards error log. The event is queued if possible */
/**************************************************************************/
static void
ergo_set_errlog_state(hysdn_card * card, int on)
{
unsigned long flags;
if (card->state != CARD_STATE_RUN) {
card->err_log_state = ERRLOG_STATE_OFF; /* must be off */
return;
}
spin_lock_irqsave(&card->hysdn_lock, flags);
if (((card->err_log_state == ERRLOG_STATE_OFF) && !on) ||
((card->err_log_state == ERRLOG_STATE_ON) && on)) {
spin_unlock_irqrestore(&card->hysdn_lock, flags);
return; /* nothing to do */
}
if (on)
card->err_log_state = ERRLOG_STATE_START; /* request start */
else
card->err_log_state = ERRLOG_STATE_STOP; /* request stop */
spin_unlock_irqrestore(&card->hysdn_lock, flags);
schedule_work(&card->irq_queue);
} /* ergo_set_errlog_state */
/******************************************/
/* test the cards RAM and return 0 if ok. */
/******************************************/
static const char TestText[36] = "This Message is filler, why read it";
static int
ergo_testram(hysdn_card * card)
{
tErgDpram *dpr = card->dpram;
memset(dpr->TrapTable, 0, sizeof(dpr->TrapTable)); /* clear all Traps */
dpr->ToHyInt = 1; /* E1 INTR state forced */
memcpy(&dpr->ToHyBuf[ERG_TO_HY_BUF_SIZE - sizeof(TestText)], TestText,
sizeof(TestText));
if (memcmp(&dpr->ToHyBuf[ERG_TO_HY_BUF_SIZE - sizeof(TestText)], TestText,
sizeof(TestText)))
return (-1);
memcpy(&dpr->ToPcBuf[ERG_TO_PC_BUF_SIZE - sizeof(TestText)], TestText,
sizeof(TestText));
if (memcmp(&dpr->ToPcBuf[ERG_TO_PC_BUF_SIZE - sizeof(TestText)], TestText,
sizeof(TestText)))
return (-1);
return (0);
} /* ergo_testram */
/*****************************************************************************/
/* this function is intended to write stage 1 boot image to the cards buffer */
/* this is done in two steps. First the 1024 hi-words are written (offs=0), */
/* then the 1024 lo-bytes are written. The remaining DPRAM is cleared, the */
/* PCI-write-buffers flushed and the card is taken out of reset. */
/* The function then waits for a reaction of the E1 processor or a timeout. */
/* Negative return values are interpreted as errors. */
/*****************************************************************************/
static int
ergo_writebootimg(struct HYSDN_CARD *card, unsigned char *buf,
unsigned long offs)
{
unsigned char *dst;
tErgDpram *dpram;
int cnt = (BOOT_IMG_SIZE >> 2); /* number of words to move and swap (byte order!) */
if (card->debug_flags & LOG_POF_CARD)
hysdn_addlog(card, "ERGO: write bootldr offs=0x%lx ", offs);
dst = card->dpram; /* pointer to start of DPRAM */
dst += (offs + ERG_DPRAM_FILL_SIZE); /* offset in the DPRAM */
while (cnt--) {
*dst++ = *(buf + 1); /* high byte */
*dst++ = *buf; /* low byte */
dst += 2; /* point to next longword */
buf += 2; /* buffer only filled with words */
}
/* if low words (offs = 2) have been written, clear the rest of the DPRAM, */
/* flush the PCI-write-buffer and take the E1 out of reset */
if (offs) {
memset(card->dpram, 0, ERG_DPRAM_FILL_SIZE); /* fill the DPRAM still not cleared */
dpram = card->dpram; /* get pointer to dpram structure */
dpram->ToHyNoDpramErrLog = 0xFF; /* write a dpram register */
while (!dpram->ToHyNoDpramErrLog); /* reread volatile register to flush PCI */
byteout(card->iobase + PCI9050_USER_IO, PCI9050_E1_RUN); /* start E1 processor */
/* the interrupts are still masked */
sti();
msleep_interruptible(20); /* Timeout 20ms */
if (((tDpramBootSpooler *) card->dpram)->Len != DPRAM_SPOOLER_DATA_SIZE) {
if (card->debug_flags & LOG_POF_CARD)
hysdn_addlog(card, "ERGO: write bootldr no answer");
return (-ERR_BOOTIMG_FAIL);
}
} /* start_boot_img */
return (0); /* successful */
} /* ergo_writebootimg */
/********************************************************************************/
/* ergo_writebootseq writes the buffer containing len bytes to the E1 processor */
/* using the boot spool mechanism. If everything works fine 0 is returned. In */
/* case of errors a negative error value is returned. */
/********************************************************************************/
static int
ergo_writebootseq(struct HYSDN_CARD *card, unsigned char *buf, int len)
{
tDpramBootSpooler *sp = (tDpramBootSpooler *) card->dpram;
unsigned char *dst;
unsigned char buflen;
int nr_write;
unsigned char tmp_rdptr;
unsigned char wr_mirror;
int i;
if (card->debug_flags & LOG_POF_CARD)
hysdn_addlog(card, "ERGO: write boot seq len=%d ", len);
dst = sp->Data; /* point to data in spool structure */
buflen = sp->Len; /* maximum len of spooled data */
wr_mirror = sp->WrPtr; /* only once read */
sti();
/* try until all bytes written or error */
i = 0x1000; /* timeout value */
while (len) {
/* first determine the number of bytes that may be buffered */
do {
tmp_rdptr = sp->RdPtr; /* first read the pointer */
i--; /* decrement timeout */
} while (i && (tmp_rdptr != sp->RdPtr)); /* wait for stable pointer */
if (!i) {
if (card->debug_flags & LOG_POF_CARD)
hysdn_addlog(card, "ERGO: write boot seq timeout");
return (-ERR_BOOTSEQ_FAIL); /* value not stable -> timeout */
}
if ((nr_write = tmp_rdptr - wr_mirror - 1) < 0)
nr_write += buflen; /* now we got number of free bytes - 1 in buffer */
if (!nr_write)
continue; /* no free bytes in buffer */
if (nr_write > len)
nr_write = len; /* limit if last few bytes */
i = 0x1000; /* reset timeout value */
/* now we know how much bytes we may put in the puffer */
len -= nr_write; /* we savely could adjust len before output */
while (nr_write--) {
*(dst + wr_mirror) = *buf++; /* output one byte */
if (++wr_mirror >= buflen)
wr_mirror = 0;
sp->WrPtr = wr_mirror; /* announce the next byte to E1 */
} /* while (nr_write) */
} /* while (len) */
return (0);
} /* ergo_writebootseq */
/***********************************************************************************/
/* ergo_waitpofready waits for a maximum of 10 seconds for the completition of the */
/* boot process. If the process has been successful 0 is returned otherwise a */
/* negative error code is returned. */
/***********************************************************************************/
static int
ergo_waitpofready(struct HYSDN_CARD *card)
{
tErgDpram *dpr = card->dpram; /* pointer to DPRAM structure */
int timecnt = 10000 / 50; /* timeout is 10 secs max. */
unsigned long flags;
int msg_size;
int i;
if (card->debug_flags & LOG_POF_CARD)
hysdn_addlog(card, "ERGO: waiting for pof ready");
while (timecnt--) {
/* wait until timeout */
if (dpr->ToPcFlag) {
/* data has arrived */
if ((dpr->ToPcChannel != CHAN_SYSTEM) ||
(dpr->ToPcSize < MIN_RDY_MSG_SIZE) ||
(dpr->ToPcSize > MAX_RDY_MSG_SIZE) ||
((*(unsigned long *) dpr->ToPcBuf) != RDY_MAGIC))
break; /* an error occurred */
/* Check for additional data delivered during SysReady */
msg_size = dpr->ToPcSize - RDY_MAGIC_SIZE;
if (msg_size > 0)
if (EvalSysrTokData(card, dpr->ToPcBuf + RDY_MAGIC_SIZE, msg_size))
break;
if (card->debug_flags & LOG_POF_RECORD)
hysdn_addlog(card, "ERGO: pof boot success");
spin_lock_irqsave(&card->hysdn_lock, flags);
card->state = CARD_STATE_RUN; /* now card is running */
/* enable the cards interrupt */
byteout(card->iobase + PCI9050_INTR_REG,
bytein(card->iobase + PCI9050_INTR_REG) |
(PCI9050_INTR_REG_ENPCI | PCI9050_INTR_REG_EN1));
card->irq_enabled = 1; /* we are ready to receive interrupts */
dpr->ToPcFlag = 0; /* reset data indicator */
dpr->ToHyInt = 1;
dpr->ToPcInt = 1; /* interrupt to E1 for all cards */
spin_unlock_irqrestore(&card->hysdn_lock, flags);
if ((hynet_enable & (1 << card->myid))
&& (i = hysdn_net_create(card)))
{
ergo_stopcard(card);
card->state = CARD_STATE_BOOTERR;
return (i);
}
#ifdef CONFIG_HYSDN_CAPI
if((i = hycapi_capi_create(card))) {
printk(KERN_WARNING "HYSDN: failed to create capi-interface.\n");
}
#endif /* CONFIG_HYSDN_CAPI */
return (0); /* success */
} /* data has arrived */
sti();
msleep_interruptible(50); /* Timeout 50ms */
} /* wait until timeout */
if (card->debug_flags & LOG_POF_CARD)
hysdn_addlog(card, "ERGO: pof boot ready timeout");
return (-ERR_POF_TIMEOUT);
} /* ergo_waitpofready */
/************************************************************************************/
/* release the cards hardware. Before releasing do a interrupt disable and hardware */
/* reset. Also unmap dpram. */
/* Use only during module release. */
/************************************************************************************/
static void
ergo_releasehardware(hysdn_card * card)
{
ergo_stopcard(card); /* first stop the card if not already done */
free_irq(card->irq, card); /* release interrupt */
release_region(card->iobase + PCI9050_INTR_REG, 1); /* release all io ports */
release_region(card->iobase + PCI9050_USER_IO, 1);
iounmap(card->dpram);
card->dpram = NULL; /* release shared mem */
} /* ergo_releasehardware */
/*********************************************************************************/
/* acquire the needed hardware ports and map dpram. If an error occurs a nonzero */
/* value is returned. */
/* Use only during module init. */
/*********************************************************************************/
int
ergo_inithardware(hysdn_card * card)
{
if (!request_region(card->iobase + PCI9050_INTR_REG, 1, "HYSDN"))
return (-1);
if (!request_region(card->iobase + PCI9050_USER_IO, 1, "HYSDN")) {
release_region(card->iobase + PCI9050_INTR_REG, 1);
return (-1); /* ports already in use */
}
card->memend = card->membase + ERG_DPRAM_PAGE_SIZE - 1;
if (!(card->dpram = ioremap(card->membase, ERG_DPRAM_PAGE_SIZE))) {
release_region(card->iobase + PCI9050_INTR_REG, 1);
release_region(card->iobase + PCI9050_USER_IO, 1);
return (-1);
}
ergo_stopcard(card); /* disable interrupts */
if (request_irq(card->irq, ergo_interrupt, IRQF_SHARED, "HYSDN", card)) {
ergo_releasehardware(card); /* return the acquired hardware */
return (-1);
}
/* success, now setup the function pointers */
card->stopcard = ergo_stopcard;
card->releasehardware = ergo_releasehardware;
card->testram = ergo_testram;
card->writebootimg = ergo_writebootimg;
card->writebootseq = ergo_writebootseq;
card->waitpofready = ergo_waitpofready;
card->set_errlog_state = ergo_set_errlog_state;
INIT_WORK(&card->irq_queue, ergo_irq_bh);
card->hysdn_lock = SPIN_LOCK_UNLOCKED;
return (0);
} /* ergo_inithardware */
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