path: root/drivers/isdn/hardware/avm/b1dma.c

/* $Id: b1dma.c,v 1.1.2.3 2004/02/10 01:07:12 keil Exp $
 * 
 * Common module for AVM B1 cards that support dma with AMCC
 * 
 * Copyright 2000 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.
 *
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/skbuff.h>
#include <linux/delay.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/capi.h>
#include <linux/kernelcapi.h>
#include <linux/gfp.h>
#include <asm/io.h>
#include <linux/init.h>
#include <asm/uaccess.h>
#include <linux/netdevice.h>
#include <linux/isdn/capilli.h>
#include "avmcard.h"
#include <linux/isdn/capicmd.h>
#include <linux/isdn/capiutil.h>

static char *revision = "$Revision: 1.1.2.3 $";

#undef AVM_B1DMA_DEBUG

/* ------------------------------------------------------------- */

MODULE_DESCRIPTION("CAPI4Linux: DMA support for active AVM cards");
MODULE_AUTHOR("Carsten Paeth");
MODULE_LICENSE("GPL");

static int suppress_pollack = 0;
module_param(suppress_pollack, bool, 0);

/* ------------------------------------------------------------- */

static void b1dma_dispatch_tx(avmcard *card);

/* ------------------------------------------------------------- */

/* S5933 */

#define	AMCC_RXPTR	0x24
#define	AMCC_RXLEN	0x28
#define	AMCC_TXPTR	0x2c
#define	AMCC_TXLEN	0x30

#define	AMCC_INTCSR	0x38
#	define EN_READ_TC_INT		0x00008000L
#	define EN_WRITE_TC_INT		0x00004000L
#	define EN_TX_TC_INT		EN_READ_TC_INT
#	define EN_RX_TC_INT		EN_WRITE_TC_INT
#	define AVM_FLAG			0x30000000L

#	define ANY_S5933_INT		0x00800000L
#	define READ_TC_INT		0x00080000L
#	define WRITE_TC_INT		0x00040000L
#	define	TX_TC_INT		READ_TC_INT
#	define	RX_TC_INT		WRITE_TC_INT
#	define MASTER_ABORT_INT		0x00100000L
#	define TARGET_ABORT_INT		0x00200000L
#	define BUS_MASTER_INT		0x00200000L
#	define ALL_INT			0x000C0000L

#define	AMCC_MCSR	0x3c
#	define A2P_HI_PRIORITY		0x00000100L
#	define EN_A2P_TRANSFERS		0x00000400L
#	define P2A_HI_PRIORITY		0x00001000L
#	define EN_P2A_TRANSFERS		0x00004000L
#	define RESET_A2P_FLAGS		0x04000000L
#	define RESET_P2A_FLAGS		0x02000000L

/* ------------------------------------------------------------- */

static inline void b1dma_writel(avmcard *card, u32 value, int off)
{
	writel(value, card->mbase + off);
}

static inline u32 b1dma_readl(avmcard *card, int off)
{
	return readl(card->mbase + off);
}

/* ------------------------------------------------------------- */

static inline int b1dma_tx_empty(unsigned int port)
{
	return inb(port + 0x03) & 0x1;
}

static inline int b1dma_rx_full(unsigned int port)
{
	return inb(port + 0x02) & 0x1;
}

static int b1dma_tolink(avmcard *card, void *buf, unsigned int len)
{
	unsigned long stop = jiffies + 1 * HZ;	/* maximum wait time 1 sec */
	unsigned char *s = (unsigned char *)buf;
	while (len--) {
		while (   !b1dma_tx_empty(card->port)
		       && time_before(jiffies, stop));
		if (!b1dma_tx_empty(card->port)) 
			return -1;
	        t1outp(card->port, 0x01, *s++);
	}
	return 0;
}

static int b1dma_fromlink(avmcard *card, void *buf, unsigned int len)
{
	unsigned long stop = jiffies + 1 * HZ;	/* maximum wait time 1 sec */
	unsigned char *s = (unsigned char *)buf;
	while (len--) {
		while (   !b1dma_rx_full(card->port)
		       && time_before(jiffies, stop));
		if (!b1dma_rx_full(card->port)) 
			return -1;
	        *s++ = t1inp(card->port, 0x00);
	}
	return 0;
}

static int WriteReg(avmcard *card, u32 reg, u8 val)
{
	u8 cmd = 0x00;
	if (   b1dma_tolink(card, &cmd, 1) == 0
	    && b1dma_tolink(card, &reg, 4) == 0) {
		u32 tmp = val;
		return b1dma_tolink(card, &tmp, 4);
	}
	return -1;
}

static u8 ReadReg(avmcard *card, u32 reg)
{
	u8 cmd = 0x01;
	if (   b1dma_tolink(card, &cmd, 1) == 0
	    && b1dma_tolink(card, &reg, 4) == 0) {
		u32 tmp;
		if (b1dma_fromlink(card, &tmp, 4) == 0)
			return (u8)tmp;
	}
	return 0xff;
}

/* ------------------------------------------------------------- */

static inline void _put_byte(void **pp, u8 val)
{
	u8 *s