boardergo.c

优龙2410linux2.6.8内核源代码

/* $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 ([e-mail]) for Hypercope GmbH
 * Copyright 1999 by Werner Cornelius ([e-mail])
 *
 * 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/config.h>
#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 <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, struct pt_regs *regs)
{
	hysdn_card *card = dev_id;	/* parameter from irq */
	tErgDpram *dpr;
	ulong flags;
	uchar volatile b;

	if (!card)
		return IRQ_NONE;		/* error -> spurious interrupt */
	if (!card->irq_enabled)
		return IRQ_NONE;		/* other device interrupting or irq switched off */

	save_flags(flags);
	cli();			/* no further irqs allowed */

	if (!(bytein(card->iobase + PCI9050_INTR_REG) & PCI9050_INTR_REG_STAT1)) {
		restore_flags(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);
	restore_flags(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(hysdn_card * card)
{
	tErgDpram *dpr;
	int again;
	ulong flags;

	if (card->state != CARD_STATE_RUN)
		return;		/* invalid call */

	dpr = card->dpram;	/* point to DPRAM */

	save_flags(flags);
	cli();
	if (card->hw_lock) {
		restore_flags(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 */

	restore_flags(flags);
}				/* ergo_irq_bh */


/*********************************************************/
/* stop the card (hardware reset) and disable interrupts */
/*********************************************************/
static void
ergo_stopcard(hysdn_card * card)
{
	ulong flags;
	uchar val;

	hysdn_net_release(card);	/* first release the net device if existing */
#ifdef CONFIG_HYSDN_CAPI
	hycapi_capi_stop(card);
#endif /* CONFIG_HYSDN_CAPI */
	save_flags(flags);
	cli();
	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 */

	restore_flags(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)
{
	ulong flags;

	if (card->state != CARD_STATE_RUN) {
		card->err_log_state = ERRLOG_STATE_OFF;		/* must be off */
		return;
	}
	save_flags(flags);
	cli();

	if (((card->err_log_state == ERRLOG_STATE_OFF) && !on) ||
	    ((card->err_log_state == ERRLOG_STATE_ON) && on)) {
		restore_flags(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 */

	restore_flags(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, uchar * buf, ulong offs)
{
	uchar *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 */