net: hamradio: remove support for DMA SCC devices

Another incarnation of Z8530, looks like? Again, no real changes
in the git history, and it needs VIRT_TO_BUS. Unlikely to have
users, let's spend less time refactoring dead code...

Signed-off-by: Jakub Kicinski <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

MAINTAINERS

···
 HIGH-SPEED SCC DRIVER FOR AX.25
 L:	[e-mail]
 S:	Orphan
-F:	drivers/net/hamradio/dmascc.c
 F:	drivers/net/hamradio/scc.c
 
 HIGHPOINT ROCKETRAID 3xxx RAID DRIVER

drivers/net/hamradio/Kconfig

···
 	  useful if some other computer on your local network has a direct
 	  amateur radio connection.
 
-config DMASCC
-	tristate "High-speed (DMA) SCC driver for AX.25"
-	depends on ISA && AX25 && BROKEN_ON_SMP && ISA_DMA_API
-	depends on VIRT_TO_BUS
-	help
-	  This is a driver for high-speed SCC boards, i.e. those supporting
-	  DMA on one port. You usually use those boards to connect your
-	  computer to an amateur radio modem (such as the WA4DSY 56kbps
-	  modem), in order to send and receive AX.25 packet radio network
-	  traffic.
-
-	  Currently, this driver supports Ottawa PI/PI2, Paccomm/Gracilis
-	  PackeTwin, and S5SCC/DMA boards. They are detected automatically.
-	  If you have one of these cards, say Y here and read the AX25-HOWTO,
-	  available from <http://www.tldp.org/docs.html#howto>.
-
-	  This driver can operate multiple boards simultaneously. If you
-	  compile it as a module (by saying M instead of Y), it will be called
-	  dmascc. If you don't pass any parameter to the driver, all
-	  possible I/O addresses are probed. This could irritate other devices
-	  that are currently not in use. You may specify the list of addresses
-	  to be probed by "dmascc.io=addr1,addr2,..." (when compiled into the
-	  kernel image) or "io=addr1,addr2,..." (when loaded as a module). The
-	  network interfaces will be called dmascc0 and dmascc1 for the board
-	  detected first, dmascc2 and dmascc3 for the second one, and so on.
-
-	  Before you configure each interface with ifconfig, you MUST set
-	  certain parameters, such as channel access timing, clock mode, and
-	  DMA channel. This is accomplished with a small utility program,
-	  dmascc_cfg, available at
-	  <http://www.linux-ax25.org/wiki/Ax25-tools>. Please be sure to
-	  get at least version 1.27 of dmascc_cfg, as older versions will not
-	  work with the current driver.
-
 config SCC
 	tristate "Z8530 SCC driver"
 	depends on ISA && AX25 && ISA_DMA_API

drivers/net/hamradio/Makefile

···
 #		Christoph Hellwig <[e-mail]>
 #
 
-obj-$(CONFIG_DMASCC)		+= dmascc.o
 obj-$(CONFIG_SCC)		+= scc.o
 obj-$(CONFIG_MKISS)		+= mkiss.o
 obj-$(CONFIG_6PACK)		+= 6pack.o

drivers/net/hamradio/dmascc.c

···
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Driver for high-speed SCC boards (those with DMA support)
- * Copyright (C) 1997-2000 Klaus Kudielka
- *
- * S5SCC/DMA support by Janko Koleznik S52HI
- */
-
-
-#include <linux/module.h>
-#include <linux/bitops.h>
-#include <linux/delay.h>
-#include <linux/errno.h>
-#include <linux/if_arp.h>
-#include <linux/in.h>
-#include <linux/init.h>
-#include <linux/interrupt.h>
-#include <linux/ioport.h>
-#include <linux/kernel.h>
-#include <linux/mm.h>
-#include <linux/netdevice.h>
-#include <linux/slab.h>
-#include <linux/rtnetlink.h>
-#include <linux/sockios.h>
-#include <linux/workqueue.h>
-#include <linux/atomic.h>
-#include <asm/dma.h>
-#include <asm/io.h>
-#include <asm/irq.h>
-#include <linux/uaccess.h>
-#include <linux/jiffies.h>
-#include <net/ax25.h>
-#include "z8530.h"
-
-
-/* Number of buffers per channel */
-
-#define NUM_TX_BUF      2	/* NUM_TX_BUF >= 1 (min. 2 recommended) */
-#define NUM_RX_BUF      6	/* NUM_RX_BUF >= 1 (min. 2 recommended) */
-#define BUF_SIZE        1576	/* BUF_SIZE >= mtu + hard_header_len */
-
-
-/* Cards supported */
-
-#define HW_PI           { "Ottawa PI", 0x300, 0x20, 0x10, 8, \
-                            0, 8, 1843200, 3686400 }
-#define HW_PI2          { "Ottawa PI2", 0x300, 0x20, 0x10, 8, \
-			    0, 8, 3686400, 7372800 }
-#define HW_TWIN         { "Gracilis PackeTwin", 0x200, 0x10, 0x10, 32, \
-			    0, 4, 6144000, 6144000 }
-#define HW_S5           { "S5SCC/DMA", 0x200, 0x10, 0x10, 32, \
-                          0, 8, 4915200, 9830400 }
-
-#define HARDWARE        { HW_PI, HW_PI2, HW_TWIN, HW_S5 }
-
-#define TMR_0_HZ        25600	/* Frequency of timer 0 */
-
-#define TYPE_PI         0
-#define TYPE_PI2        1
-#define TYPE_TWIN       2
-#define TYPE_S5         3
-#define NUM_TYPES       4
-
-#define MAX_NUM_DEVS    32
-
-
-/* SCC chips supported */
-
-#define Z8530           0
-#define Z85C30          1
-#define Z85230          2
-
-#define CHIPNAMES       { "Z8530", "Z85C30", "Z85230" }
-
-
-/* I/O registers */
-
-/* 8530 registers relative to card base */
-#define SCCB_CMD        0x00
-#define SCCB_DATA       0x01
-#define SCCA_CMD        0x02
-#define SCCA_DATA       0x03
-
-/* 8253/8254 registers relative to card base */
-#define TMR_CNT0        0x00
-#define TMR_CNT1        0x01
-#define TMR_CNT2        0x02
-#define TMR_CTRL        0x03
-
-/* Additional PI/PI2 registers relative to card base */
-#define PI_DREQ_MASK    0x04
-
-/* Additional PackeTwin registers relative to card base */
-#define TWIN_INT_REG    0x08
-#define TWIN_CLR_TMR1   0x09
-#define TWIN_CLR_TMR2   0x0a
-#define TWIN_SPARE_1    0x0b
-#define TWIN_DMA_CFG    0x08
-#define TWIN_SERIAL_CFG 0x09
-#define TWIN_DMA_CLR_FF 0x0a
-#define TWIN_SPARE_2    0x0b
-
-
-/* PackeTwin I/O register values */
-
-/* INT_REG */
-#define TWIN_SCC_MSK       0x01
-#define TWIN_TMR1_MSK      0x02
-#define TWIN_TMR2_MSK      0x04
-#define TWIN_INT_MSK       0x07
-
-/* SERIAL_CFG */
-#define TWIN_DTRA_ON       0x01
-#define TWIN_DTRB_ON       0x02
-#define TWIN_EXTCLKA       0x04
-#define TWIN_EXTCLKB       0x08
-#define TWIN_LOOPA_ON      0x10
-#define TWIN_LOOPB_ON      0x20
-#define TWIN_EI            0x80
-
-/* DMA_CFG */
-#define TWIN_DMA_HDX_T1    0x08
-#define TWIN_DMA_HDX_R1    0x0a
-#define TWIN_DMA_HDX_T3    0x14
-#define TWIN_DMA_HDX_R3    0x16
-#define TWIN_DMA_FDX_T3R1  0x1b
-#define TWIN_DMA_FDX_T1R3  0x1d
-
-
-/* Status values */
-
-#define IDLE      0
-#define TX_HEAD   1
-#define TX_DATA   2
-#define TX_PAUSE  3
-#define TX_TAIL   4
-#define RTS_OFF   5
-#define WAIT      6
-#define DCD_ON    7
-#define RX_ON     8
-#define DCD_OFF   9
-
-
-/* Ioctls */
-
-#define SIOCGSCCPARAM SIOCDEVPRIVATE
-#define SIOCSSCCPARAM (SIOCDEVPRIVATE+1)
-
-
-/* Data types */
-
-struct scc_param {
-	int pclk_hz;		/* frequency of BRG input (don't change) */
-	int brg_tc;		/* BRG terminal count; BRG disabled if < 0 */
-	int nrzi;		/* 0 (nrz), 1 (nrzi) */
-	int clocks;		/* see dmascc_cfg documentation */
-	int txdelay;		/* [1/TMR_0_HZ] */
-	int txtimeout;		/* [1/HZ] */
-	int txtail;		/* [1/TMR_0_HZ] */
-	int waittime;		/* [1/TMR_0_HZ] */
-	int slottime;		/* [1/TMR_0_HZ] */
-	int persist;		/* 1 ... 256 */
-	int dma;		/* -1 (disable), 0, 1, 3 */
-	int txpause;		/* [1/TMR_0_HZ] */
-	int rtsoff;		/* [1/TMR_0_HZ] */
-	int dcdon;		/* [1/TMR_0_HZ] */
-	int dcdoff;		/* [1/TMR_0_HZ] */
-};
-
-struct scc_hardware {
-	char *name;
-	int io_region;
-	int io_delta;
-	int io_size;
-	int num_devs;
-	int scc_offset;
-	int tmr_offset;
-	int tmr_hz;
-	int pclk_hz;
-};
-
-struct scc_priv {
-	int type;
-	int chip;
-	struct net_device *dev;
-	struct scc_info *info;
-
-	int channel;
-	int card_base, scc_cmd, scc_data;
-	int tmr_cnt, tmr_ctrl, tmr_mode;
-	struct scc_param param;
-	char rx_buf[NUM_RX_BUF][BUF_SIZE];
-	int rx_len[NUM_RX_BUF];
-	int rx_ptr;
-	struct work_struct rx_work;
-	int rx_head, rx_tail, rx_count;
-	int rx_over;
-	char tx_buf[NUM_TX_BUF][BUF_SIZE];
-	int tx_len[NUM_TX_BUF];
-	int tx_ptr;
-	int tx_head, tx_tail, tx_count;
-	int state;
-	unsigned long tx_start;
-	int rr0;
-	spinlock_t *register_lock;	/* Per scc_info */
-	spinlock_t ring_lock;
-};
-
-struct scc_info {
-	int irq_used;
-	int twin_serial_cfg;
-	struct net_device *dev[2];
-	struct scc_priv priv[2];
-	struct scc_info *next;
-	spinlock_t register_lock;	/* Per device register lock */
-};
-
-
-/* Function declarations */
-static int setup_adapter(int card_base, int type, int n) __init;
-
-static void write_scc(struct scc_priv *priv, int reg, int val);
-static void write_scc_data(struct scc_priv *priv, int val, int fast);
-static int read_scc(struct scc_priv *priv, int reg);
-static int read_scc_data(struct scc_priv *priv);
-
-static int scc_open(struct net_device *dev);
-static int scc_close(struct net_device *dev);
-static int scc_siocdevprivate(struct net_device *dev, struct ifreq *ifr,
-			      void __user *data, int cmd);
-static int scc_send_packet(struct sk_buff *skb, struct net_device *dev);
-static int scc_set_mac_address(struct net_device *dev, void *sa);
-
-static inline void tx_on(struct scc_priv *priv);
-static inline void rx_on(struct scc_priv *priv);
-static inline void rx_off(struct scc_priv *priv);
-static void start_timer(struct scc_priv *priv, int t, int r15);
-static inline unsigned char random(void);
-
-static inline void z8530_isr(struct scc_info *info);
-static irqreturn_t scc_isr(int irq, void *dev_id);
-static void rx_isr(struct scc_priv *priv);
-static void special_condition(struct scc_priv *priv, int rc);
-static void rx_bh(struct work_struct *);
-static void tx_isr(struct scc_priv *priv);
-static void es_isr(struct scc_priv *priv);
-static void tm_isr(struct scc_priv *priv);
-
-
-/* Initialization variables */
-
-static int io[MAX_NUM_DEVS] __initdata = { 0, };
-
-/* Beware! hw[] is also used in dmascc_exit(). */
-static struct scc_hardware hw[NUM_TYPES] = HARDWARE;
-
-
-/* Global variables */
-
-static struct scc_info *first;
-static unsigned long rand;
-
-
-MODULE_AUTHOR("Klaus Kudielka");
-MODULE_DESCRIPTION("Driver for high-speed SCC boards");
-module_param_hw_array(io, int, ioport, NULL, 0);
-MODULE_LICENSE("GPL");
-
-static void __exit dmascc_exit(void)
-{
-	int i;
-	struct scc_info *info;
-
-	while (first) {
-		info = first;
-
-		/* Unregister devices */
-		for (i = 0; i < 2; i++)
-			unregister_netdev(info->dev[i]);
-
-		/* Reset board */
-		if (info->priv[0].type == TYPE_TWIN)
-			outb(0, info->dev[0]->base_addr + TWIN_SERIAL_CFG);
-		write_scc(&info->priv[0], R9, FHWRES);
-		release_region(info->dev[0]->base_addr,
-			       hw[info->priv[0].type].io_size);
-
-		for (i = 0; i < 2; i++)
-			free_netdev(info->dev[i]);
-
-		/* Free memory */
-		first = info->next;
-		kfree(info);
-	}
-}
-
-static int __init dmascc_init(void)
-{
-	int h, i, j, n;
-	int base[MAX_NUM_DEVS], tcmd[MAX_NUM_DEVS], t0[MAX_NUM_DEVS],
-	    t1[MAX_NUM_DEVS];
-	unsigned t_val;
-	unsigned long time, start[MAX_NUM_DEVS], delay[MAX_NUM_DEVS],
-	    counting[MAX_NUM_DEVS];
-
-	/* Initialize random number generator */
-	rand = jiffies;
-	/* Cards found = 0 */
-	n = 0;
-	/* Warning message */
-	if (!io[0])
-		printk(KERN_INFO "dmascc: autoprobing (dangerous)\n");
-
-	/* Run autodetection for each card type */
-	for (h = 0; h < NUM_TYPES; h++) {
-
-		if (io[0]) {
-			/* User-specified I/O address regions */
-			for (i = 0; i < hw[h].num_devs; i++)
-				base[i] = 0;
-			for (i = 0; i < MAX_NUM_DEVS && io[i]; i++) {
-				j = (io[i] -
-				     hw[h].io_region) / hw[h].io_delta;
-				if (j >= 0 && j < hw[h].num_devs &&
-				    hw[h].io_region +
-				    j * hw[h].io_delta == io[i]) {
-					base[j] = io[i];
-				}
-			}
-		} else {
-			/* Default I/O address regions */
-			for (i = 0; i < hw[h].num_devs; i++) {
-				base[i] =
-				    hw[h].io_region + i * hw[h].io_delta;
-			}
-		}
-
-		/* Check valid I/O address regions */
-		for (i = 0; i < hw[h].num_devs; i++)
-			if (base[i]) {
-				if (!request_region
-				    (base[i], hw[h].io_size, "dmascc"))
-					base[i] = 0;
-				else {
-					tcmd[i] =
-					    base[i] + hw[h].tmr_offset +
-					    TMR_CTRL;
-					t0[i] =
-					    base[i] + hw[h].tmr_offset +
-					    TMR_CNT0;
-					t1[i] =
-					    base[i] + hw[h].tmr_offset +
-					    TMR_CNT1;
-				}
-			}
-
-		/* Start timers */
-		for (i = 0; i < hw[h].num_devs; i++)
-			if (base[i]) {
-				/* Timer 0: LSB+MSB, Mode 3, TMR_0_HZ */
-				outb(0x36, tcmd[i]);
-				outb((hw[h].tmr_hz / TMR_0_HZ) & 0xFF,
-				     t0[i]);
-				outb((hw[h].tmr_hz / TMR_0_HZ) >> 8,
-				     t0[i]);
-				/* Timer 1: LSB+MSB, Mode 0, HZ/10 */
-				outb(0x70, tcmd[i]);
-				outb((TMR_0_HZ / HZ * 10) & 0xFF, t1[i]);
-				outb((TMR_0_HZ / HZ * 10) >> 8, t1[i]);
-				start[i] = jiffies;
-				delay[i] = 0;
-				counting[i] = 1;
-				/* Timer 2: LSB+MSB, Mode 0 */
-				outb(0xb0, tcmd[i]);
-			}
-		time = jiffies;
-		/* Wait until counter registers are loaded */
-		udelay(2000000 / TMR_0_HZ);
-
-		/* Timing loop */
-		while (time_is_after_jiffies(time + 13)) {
-			for (i = 0; i < hw[h].num_devs; i++)
-				if (base[i] && counting[i]) {
-					/* Read back Timer 1: latch; read LSB; read MSB */
-					outb(0x40, tcmd[i]);
-					t_val =
-					    inb(t1[i]) + (inb(t1[i]) << 8);
-					/* Also check whether counter did wrap */
-					if (t_val == 0 ||
-					    t_val > TMR_0_HZ / HZ * 10)
-						counting[i] = 0;
-					delay[i] = jiffies - start[i];
-				}
-		}
-
-		/* Evaluate measurements */
-		for (i = 0; i < hw[h].num_devs; i++)
-			if (base[i]) {
-				if ((delay[i] >= 9 && delay[i] <= 11) &&
-				    /* Ok, we have found an adapter */
-				    (setup_adapter(base[i], h, n) == 0))
-					n++;
-				else
-					release_region(base[i],
-						       hw[h].io_size);
-			}
-
-	}			/* NUM_TYPES */
-
-	/* If any adapter was successfully initialized, return ok */
-	if (n)
-		return 0;
-
-	/* If no adapter found, return error */
-	printk(KERN_INFO "dmascc: no adapters found\n");
-	return -EIO;
-}
-
-module_init(dmascc_init);
-module_exit(dmascc_exit);
-
-static void __init dev_setup(struct net_device *dev)
-{
-	dev->type = ARPHRD_AX25;
-	dev->hard_header_len = AX25_MAX_HEADER_LEN;
-	dev->mtu = 1500;
-	dev->addr_len = AX25_ADDR_LEN;
-	dev->tx_queue_len = 64;
-	memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN);
-	dev_addr_set(dev, (u8 *)&ax25_defaddr);
-}
-
-static const struct net_device_ops scc_netdev_ops = {
-	.ndo_open = scc_open,
-	.ndo_stop = scc_close,
-	.ndo_start_xmit = scc_send_packet,
-	.ndo_siocdevprivate = scc_siocdevprivate,
-	.ndo_set_mac_address = scc_set_mac_address,
-};
-
-static int __init setup_adapter(int card_base, int type, int n)
-{
-	int i, irq, chip, err;
-	struct scc_info *info;
-	struct net_device *dev;
-	struct scc_priv *priv;
-	unsigned long time;
-	unsigned int irqs;
-	int tmr_base = card_base + hw[type].tmr_offset;
-	int scc_base = card_base + hw[type].scc_offset;
-	char *chipnames[] = CHIPNAMES;
-
-	/* Initialize what is necessary for write_scc and write_scc_data */
-	info = kzalloc(sizeof(struct scc_info), GFP_KERNEL | GFP_DMA);
-	if (!info) {
-		err = -ENOMEM;
-		goto out;
-	}
-
-	info->dev[0] = alloc_netdev(0, "", NET_NAME_UNKNOWN, dev_setup);
-	if (!info->dev[0]) {
-		printk(KERN_ERR "dmascc: "
-		       "could not allocate memory for %s at %#3x\n",
-		       hw[type].name, card_base);
-		err = -ENOMEM;
-		goto out1;
-	}
-
-	info->dev[1] = alloc_netdev(0, "", NET_NAME_UNKNOWN, dev_setup);
-	if (!info->dev[1]) {
-		printk(KERN_ERR "dmascc: "
-		       "could not allocate memory for %s at %#3x\n",
-		       hw[type].name, card_base);
-		err = -ENOMEM;
-		goto out2;
-	}
-	spin_lock_init(&info->register_lock);
-
-	priv = &info->priv[0];
-	priv->type = type;
-	priv->card_base = card_base;
-	priv->scc_cmd = scc_base + SCCA_CMD;
-	priv->scc_data = scc_base + SCCA_DATA;
-	priv->register_lock = &info->register_lock;
-
-	/* Reset SCC */
-	write_scc(priv, R9, FHWRES | MIE | NV);
-
-	/* Determine type of chip by enabling SDLC/HDLC enhancements */
-	write_scc(priv, R15, SHDLCE);
-	if (!read_scc(priv, R15)) {
-		/* WR7' not present. This is an ordinary Z8530 SCC. */
-		chip = Z8530;
-	} else {
-		/* Put one character in TX FIFO */
-		write_scc_data(priv, 0, 0);
-		if (read_scc(priv, R0) & Tx_BUF_EMP) {
-			/* TX FIFO not full. This is a Z85230 ESCC with a 4-byte FIFO. */
-			chip = Z85230;
-		} else {
-			/* TX FIFO full. This is a Z85C30 SCC with a 1-byte FIFO. */
-			chip = Z85C30;
-		}
-	}
-	write_scc(priv, R15, 0);
-
-	/* Start IRQ auto-detection */
-	irqs = probe_irq_on();
-
-	/* Enable interrupts */
-	if (type == TYPE_TWIN) {
-		outb(0, card_base + TWIN_DMA_CFG);
-		inb(card_base + TWIN_CLR_TMR1);
-		inb(card_base + TWIN_CLR_TMR2);
-		info->twin_serial_cfg = TWIN_EI;
-		outb(info->twin_serial_cfg, card_base + TWIN_SERIAL_CFG);
-	} else {
-		write_scc(priv, R15, CTSIE);
-		write_scc(priv, R0, RES_EXT_INT);
-		write_scc(priv, R1, EXT_INT_ENAB);
-	}
-
-	/* Start timer */
-	outb(1, tmr_base + TMR_CNT1);
-	outb(0, tmr_base + TMR_CNT1);
-
-	/* Wait and detect IRQ */
-	time = jiffies;
-	while (time_is_after_jiffies(time + 2 + HZ / TMR_0_HZ));
-	irq = probe_irq_off(irqs);
-
-	/* Clear pending interrupt, disable interrupts */
-	if (type == TYPE_TWIN) {
-		inb(card_base + TWIN_CLR_TMR1);
-	} else {
-		write_scc(priv, R1, 0);
-		write_scc(priv, R15, 0);
-		write_scc(priv, R0, RES_EXT_INT);
-	}
-
-	if (irq <= 0) {
-		printk(KERN_ERR
-		       "dmascc: could not find irq of %s at %#3x (irq=%d)\n",
-		       hw[type].name, card_base, irq);
-		err = -ENODEV;
-		goto out3;
-	}
-
-	/* Set up data structures */
-	for (i = 0; i < 2; i++) {
-		dev = info->dev[i];
-		priv = &info->priv[i];
-		priv->type = type;
-		priv->chip = chip;
-		priv->dev = dev;
-		priv->info = info;
-		priv->channel = i;
-		spin_lock_init(&priv->ring_lock);
-		priv->register_lock = &info->register_lock;
-		priv->card_base = card_base;
-		priv->scc_cmd = scc_base + (i ? SCCB_CMD : SCCA_CMD);
-		priv->scc_data = scc_base + (i ? SCCB_DATA : SCCA_DATA);
-		priv->tmr_cnt = tmr_base + (i ? TMR_CNT2 : TMR_CNT1);
-		priv->tmr_ctrl = tmr_base + TMR_CTRL;
-		priv->tmr_mode = i ? 0xb0 : 0x70;
-		priv->param.pclk_hz = hw[type].pclk_hz;
-		priv->param.brg_tc = -1;
-		priv->param.clocks = TCTRxCP | RCRTxCP;
-		priv->param.persist = 256;
-		priv->param.dma = -1;
-		INIT_WORK(&priv->rx_work, rx_bh);
-		dev->ml_priv = priv;
-		snprintf(dev->name, sizeof(dev->name), "dmascc%i", 2 * n + i);
-		dev->base_addr = card_base;
-		dev->irq = irq;
-		dev->netdev_ops = &scc_netdev_ops;
-		dev->header_ops = &ax25_header_ops;
-	}
-	if (register_netdev(info->dev[0])) {
-		printk(KERN_ERR "dmascc: could not register %s\n",
-		       info->dev[0]->name);
-		err = -ENODEV;
-		goto out3;
-	}
-	if (register_netdev(info->dev[1])) {
-		printk(KERN_ERR "dmascc: could not register %s\n",
-		       info->dev[1]->name);
-		err = -ENODEV;
-		goto out4;
-	}
-
-
-	info->next = first;
-	first = info;
-	printk(KERN_INFO "dmascc: found %s (%s) at %#3x, irq %d\n",
-	       hw[type].name, chipnames[chip], card_base, irq);
-	return 0;
-
-      out4:
-	unregister_netdev(info->dev[0]);
-      out3:
-	if (info->priv[0].type == TYPE_TWIN)
-		outb(0, info->dev[0]->base_addr + TWIN_SERIAL_CFG);
-	write_scc(&info->priv[0], R9, FHWRES);
-	free_netdev(info->dev[1]);
-      out2:
-	free_netdev(info->dev[0]);
-      out1:
-	kfree(info);
-      out:
-	return err;
-}
-
-
-/* Driver functions */
-
-static void write_scc(struct scc_priv *priv, int reg, int val)
-{
-	unsigned long flags;
-	switch (priv->type) {
-	case TYPE_S5:
-		if (reg)
-			outb(reg, priv->scc_cmd);
-		outb(val, priv->scc_cmd);
-		return;
-	case TYPE_TWIN:
-		if (reg)
-			outb_p(reg, priv->scc_cmd);
-		outb_p(val, priv->scc_cmd);
-		return;
-	default:
-		spin_lock_irqsave(priv->register_lock, flags);
-		outb_p(0, priv->card_base + PI_DREQ_MASK);
-		if (reg)
-			outb_p(reg, priv->scc_cmd);
-		outb_p(val, priv->scc_cmd);
-		outb(1, priv->card_base + PI_DREQ_MASK);
-		spin_unlock_irqrestore(priv->register_lock, flags);
-		return;
-	}
-}
-
-
-static void write_scc_data(struct scc_priv *priv, int val, int fast)
-{
-	unsigned long flags;
-	switch (priv->type) {
-	case TYPE_S5:
-		outb(val, priv->scc_data);
-		return;
-	case TYPE_TWIN:
-		outb_p(val, priv->scc_data);
-		return;
-	default:
-		if (fast)
-			outb_p(val, priv->scc_data);
-		else {
-			spin_lock_irqsave(priv->register_lock, flags);
-			outb_p(0, priv->card_base + PI_DREQ_MASK);
-			outb_p(val, priv->scc_data);
-			outb(1, priv->card_base + PI_DREQ_MASK);
-			spin_unlock_irqrestore(priv->register_lock, flags);
-		}
-		return;
-	}
-}
-
-
-static int read_scc(struct scc_priv *priv, int reg)
-{
-	int rc;
-	unsigned long flags;
-	switch (priv->type) {
-	case TYPE_S5:
-		if (reg)
-			outb(reg, priv->scc_cmd);
-		return inb(priv->scc_cmd);
-	case TYPE_TWIN:
-		if (reg)
-			outb_p(reg, priv->scc_cmd);
-		return inb_p(priv->scc_cmd);
-	default:
-		spin_lock_irqsave(priv->register_lock, flags);
-		outb_p(0, priv->card_base + PI_DREQ_MASK);
-		if (reg)
-			outb_p(reg, priv->scc_cmd);
-		rc = inb_p(priv->scc_cmd);
-		outb(1, priv->card_base + PI_DREQ_MASK);
-		spin_unlock_irqrestore(priv->register_lock, flags);
-		return rc;
-	}
-}
-
-
-static int read_scc_data(struct scc_priv *priv)
-{
-	int rc;
-	unsigned long flags;
-	switch (priv->type) {
-	case TYPE_S5:
-		return inb(priv->scc_data);
-	case TYPE_TWIN:
-		return inb_p(priv->scc_data);
-	default:
-		spin_lock_irqsave(priv->register_lock, flags);
-		outb_p(0, priv->card_base + PI_DREQ_MASK);
-		rc = inb_p(priv->scc_data);
-		outb(1, priv->card_base + PI_DREQ_MASK);
-		spin_unlock_irqrestore(priv->register_lock, flags);
-		return rc;
-	}
-}
-
-
-static int scc_open(struct net_device *dev)
-{
-	struct scc_priv *priv = dev->ml_priv;
-	struct scc_info *info = priv->info;
-	int card_base = priv->card_base;
-
-	/* Request IRQ if not already used by other channel */
-	if (!info->irq_used) {
-		if (request_irq(dev->irq, scc_isr, 0, "dmascc", info)) {
-			return -EAGAIN;
-		}
-	}
-	info->irq_used++;
-
-	/* Request DMA if required */
-	if (priv->param.dma >= 0) {
-		if (request_dma(priv->param.dma, "dmascc")) {
-			if (--info->irq_used == 0)
-				free_irq(dev->irq, info);
-			return -EAGAIN;
-		} else {
-			unsigned long flags = claim_dma_lock();
-			clear_dma_ff(priv->param.dma);
-			release_dma_lock(flags);
-		}
-	}
-
-	/* Initialize local variables */
-	priv->rx_ptr = 0;
-	priv->rx_over = 0;
-	priv->rx_head = priv->rx_tail = priv->rx_count = 0;
-	priv->state = IDLE;
-	priv->tx_head = priv->tx_tail = priv->tx_count = 0;
-	priv->tx_ptr = 0;
-
-	/* Reset channel */
-	write_scc(priv, R9, (priv->channel ? CHRB : CHRA) | MIE | NV);
-	/* X1 clock, SDLC mode */
-	write_scc(priv, R4, SDLC | X1CLK);
-	/* DMA */
-	write_scc(priv, R1, EXT_INT_ENAB | WT_FN_RDYFN);
-	/* 8 bit RX char, RX disable */
-	write_scc(priv, R3, Rx8);
-	/* 8 bit TX char, TX disable */
-	write_scc(priv, R5, Tx8);
-	/* SDLC address field */
-	write_scc(priv, R6, 0);
-	/* SDLC flag */
-	write_scc(priv, R7, FLAG);
-	switch (priv->chip) {
-	case Z85C30:
-		/* Select WR7' */
-		write_scc(priv, R15, SHDLCE);
-		/* Auto EOM reset */
-		write_scc(priv, R7, AUTOEOM);
-		write_scc(priv, R15, 0);
-		break;
-	case Z85230:
-		/* Select WR7' */
-		write_scc(priv, R15, SHDLCE);
-		/* The following bits are set (see 2.5.2.1):
-		   - Automatic EOM reset
-		   - Interrupt request if RX FIFO is half full
-		   This bit should be ignored in DMA mode (according to the
-		   documentation), but actually isn't. The receiver doesn't work if
-		   it is set. Thus, we have to clear it in DMA mode.
-		   - Interrupt/DMA request if TX FIFO is completely empty
-		   a) If set, the ESCC behaves as if it had no TX FIFO (Z85C30
-		   compatibility).
-		   b) If cleared, DMA requests may follow each other very quickly,
-		   filling up the TX FIFO.
-		   Advantage: TX works even in case of high bus latency.
-		   Disadvantage: Edge-triggered DMA request circuitry may miss
-		   a request. No more data is delivered, resulting
-		   in a TX FIFO underrun.
-		   Both PI2 and S5SCC/DMA seem to work fine with TXFIFOE cleared.
-		   The PackeTwin doesn't. I don't know about the PI, but let's
-		   assume it behaves like the PI2.
-		 */
-		if (priv->param.dma >= 0) {
-			if (priv->type == TYPE_TWIN)
-				write_scc(priv, R7, AUTOEOM | TXFIFOE);
-			else
-				write_scc(priv, R7, AUTOEOM);
-		} else {
-			write_scc(priv, R7, AUTOEOM | RXFIFOH);
-		}
-		write_scc(priv, R15, 0);
-		break;
-	}
-	/* Preset CRC, NRZ(I) encoding */
-	write_scc(priv, R10, CRCPS | (priv->param.nrzi ? NRZI : NRZ));
-
-	/* Configure baud rate generator */
-	if (priv->param.brg_tc >= 0) {
-		/* Program BR generator */
-		write_scc(priv, R12, priv->param.brg_tc & 0xFF);
-		write_scc(priv, R13, (priv->param.brg_tc >> 8) & 0xFF);
-		/* BRG source = SYS CLK; enable BRG; DTR REQ function (required by
-		   PackeTwin, not connected on the PI2); set DPLL source to BRG */
-		write_scc(priv, R14, SSBR | DTRREQ | BRSRC | BRENABL);
-		/* Enable DPLL */
-		write_scc(priv, R14, SEARCH | DTRREQ | BRSRC | BRENABL);
-	} else {
-		/* Disable BR generator */
-		write_scc(priv, R14, DTRREQ | BRSRC);
-	}
-
-	/* Configure clocks */
-	if (priv->type == TYPE_TWIN) {
-		/* Disable external TX clock receiver */
-		outb((info->twin_serial_cfg &=
-		      ~(priv->channel ? TWIN_EXTCLKB : TWIN_EXTCLKA)),
-		     card_base + TWIN_SERIAL_CFG);
-	}
-	write_scc(priv, R11, priv->param.clocks);
-	if ((priv->type == TYPE_TWIN) && !(priv->param.clocks & TRxCOI)) {
-		/* Enable external TX clock receiver */
-		outb((info->twin_serial_cfg |=
-		      (priv->channel ? TWIN_EXTCLKB : TWIN_EXTCLKA)),
-		     card_base + TWIN_SERIAL_CFG);
-	}
-
-	/* Configure PackeTwin */
-	if (priv->type == TYPE_TWIN) {
-		/* Assert DTR, enable interrupts */
-		outb((info->twin_serial_cfg |= TWIN_EI |
-		      (priv->channel ? TWIN_DTRB_ON : TWIN_DTRA_ON)),
-		     card_base + TWIN_SERIAL_CFG);
-	}
-
-	/* Read current status */
-	priv->rr0 = read_scc(priv, R0);
-	/* Enable DCD interrupt */
-	write_scc(priv, R15, DCDIE);
-
-	netif_start_queue(dev);
-
-	return 0;
-}
-
-
-static int scc_close(struct net_device *dev)
-{
-	struct scc_priv *priv = dev->ml_priv;
-	struct scc_info *info = priv->info;
-	int card_base = priv->card_base;
-
-	netif_stop_queue(dev);
-
-	if (priv->type == TYPE_TWIN) {
-		/* Drop DTR */
-		outb((info->twin_serial_cfg &=
-		      (priv->channel ? ~TWIN_DTRB_ON : ~TWIN_DTRA_ON)),
-		     card_base + TWIN_SERIAL_CFG);
-	}
-
-	/* Reset channel, free DMA and IRQ */
-	write_scc(priv, R9, (priv->channel ? CHRB : CHRA) | MIE | NV);
-	if (priv->param.dma >= 0) {
-		if (priv->type == TYPE_TWIN)
-			outb(0, card_base + TWIN_DMA_CFG);
-		free_dma(priv->param.dma);
-	}
-	if (--info->irq_used == 0)
-		free_irq(dev->irq, info);
-
-	return 0;
-}
-
-
-static int scc_siocdevprivate(struct net_device *dev, struct ifreq *ifr, void __user *data, int cmd)
-{
-	struct scc_priv *priv = dev->ml_priv;
-
-	switch (cmd) {
-	case SIOCGSCCPARAM:
-		if (copy_to_user(data, &priv->param, sizeof(struct scc_param)))
-			return -EFAULT;
-		return 0;
-	case SIOCSSCCPARAM:
-		if (!capable(CAP_NET_ADMIN))
-			return -EPERM;
-		if (netif_running(dev))
-			return -EAGAIN;
-		if (copy_from_user(&priv->param, data,
-				   sizeof(struct scc_param)))
-			return -EFAULT;
-		return 0;
-	default:
-		return -EOPNOTSUPP;
-	}
-}
-
-
-static int scc_send_packet(struct sk_buff *skb, struct net_device *dev)
-{
-	struct scc_priv *priv = dev->ml_priv;
-	unsigned long flags;
-	int i;
-
-	if (skb->protocol == htons(ETH_P_IP))
-		return ax25_ip_xmit(skb);
-
-	/* Temporarily stop the scheduler feeding us packets */
-	netif_stop_queue(dev);
-
-	/* Transfer data to DMA buffer */
-	i = priv->tx_head;
-	skb_copy_from_linear_data_offset(skb, 1, priv->tx_buf[i], skb->len - 1);
-	priv->tx_len[i] = skb->len - 1;
-
-	/* Clear interrupts while we touch our circular buffers */
-
-	spin_lock_irqsave(&priv->ring_lock, flags);
-	/* Move the ring buffer's head */
-	priv->tx_head = (i + 1) % NUM_TX_BUF;
-	priv->tx_count++;
-
-	/* If we just filled up the last buffer, leave queue stopped.
-	   The higher layers must wait until we have a DMA buffer
-	   to accept the data. */
-	if (priv->tx_count < NUM_TX_BUF)
-		netif_wake_queue(dev);
-
-	/* Set new TX state */
-	if (priv->state == IDLE) {
-		/* Assert RTS, start timer */
-		priv->state = TX_HEAD;
-		priv->tx_start = jiffies;
-		write_scc(priv, R5, TxCRC_ENAB | RTS | TxENAB | Tx8);
-		write_scc(priv, R15, 0);
-		start_timer(priv, priv->param.txdelay, 0);
-	}
-
-	/* Turn interrupts back on and free buffer */
-	spin_unlock_irqrestore(&priv->ring_lock, flags);
-	dev_kfree_skb(skb);
-
-	return NETDEV_TX_OK;
-}
-
-
-static int scc_set_mac_address(struct net_device *dev, void *sa)
-{
-	dev_addr_set(dev, ((struct sockaddr *)sa)->sa_data);
-	return 0;
-}
-
-
-static inline void tx_on(struct scc_priv *priv)
-{
-	int i, n;
-	unsigned long flags;
-
-	if (priv->param.dma >= 0) {
-		n = (priv->chip == Z85230) ? 3 : 1;
-		/* Program DMA controller */
-		flags = claim_dma_lock();
-		set_dma_mode(priv->param.dma, DMA_MODE_WRITE);
-		set_dma_addr(priv->param.dma,
-			     virt_to_bus(priv->tx_buf[priv->tx_tail]) + n);
-		set_dma_count(priv->param.dma,
-			      priv->tx_len[priv->tx_tail] - n);
-		release_dma_lock(flags);
-		/* Enable TX underrun interrupt */
-		write_scc(priv, R15, TxUIE);
-		/* Configure DREQ */
-		if (priv->type == TYPE_TWIN)
-			outb((priv->param.dma ==
-			      1) ? TWIN_DMA_HDX_T1 : TWIN_DMA_HDX_T3,
-			     priv->card_base + TWIN_DMA_CFG);
-		else
-			write_scc(priv, R1,
-				  EXT_INT_ENAB | WT_FN_RDYFN |
-				  WT_RDY_ENAB);
-		/* Write first byte(s) */
-		spin_lock_irqsave(priv->register_lock, flags);
-		for (i = 0; i < n; i++)
-			write_scc_data(priv,
-				       priv->tx_buf[priv->tx_tail][i], 1);
-		enable_dma(priv->param.dma);
-		spin_unlock_irqrestore(priv->register_lock, flags);
-	} else {
-		write_scc(priv, R15, TxUIE);
-		write_scc(priv, R1,
-			  EXT_INT_ENAB | WT_FN_RDYFN | TxINT_ENAB);
-		tx_isr(priv);
-	}
-	/* Reset EOM latch if we do not have the AUTOEOM feature */
-	if (priv->chip == Z8530)
-		write_scc(priv, R0, RES_EOM_L);
-}
-
-
-static inline void rx_on(struct scc_priv *priv)
-{
-	unsigned long flags;
-
-	/* Clear RX FIFO */
-	while (read_scc(priv, R0) & Rx_CH_AV)
-		read_scc_data(priv);
-	priv->rx_over = 0;
-	if (priv->param.dma >= 0) {
-		/* Program DMA controller */
-		flags = claim_dma_lock();
-		set_dma_mode(priv->param.dma, DMA_MODE_READ);
-		set_dma_addr(priv->param.dma,
-			     virt_to_bus(priv->rx_buf[priv->rx_head]));
-		set_dma_count(priv->param.dma, BUF_SIZE);
-		release_dma_lock(flags);
-		enable_dma(priv->param.dma);
-		/* Configure PackeTwin DMA */
-		if (priv->type == TYPE_TWIN) {
-			outb((priv->param.dma ==
-			      1) ? TWIN_DMA_HDX_R1 : TWIN_DMA_HDX_R3,
-			     priv->card_base + TWIN_DMA_CFG);
-		}
-		/* Sp. cond. intr. only, ext int enable, RX DMA enable */
-		write_scc(priv, R1, EXT_INT_ENAB | INT_ERR_Rx |
-			  WT_RDY_RT | WT_FN_RDYFN | WT_RDY_ENAB);
-	} else {
-		/* Reset current frame */
-		priv->rx_ptr = 0;
-		/* Intr. on all Rx characters and Sp. cond., ext int enable */
-		write_scc(priv, R1, EXT_INT_ENAB | INT_ALL_Rx | WT_RDY_RT |
-			  WT_FN_RDYFN);
-	}
-	write_scc(priv, R0, ERR_RES);
-	write_scc(priv, R3, RxENABLE | Rx8 | RxCRC_ENAB);
-}
-
-
-static inline void rx_off(struct scc_priv *priv)
-{
-	/* Disable receiver */
-	write_scc(priv, R3, Rx8);
-	/* Disable DREQ / RX interrupt */
-	if (priv->param.dma >= 0 && priv->type == TYPE_TWIN)
-		outb(0, priv->card_base + TWIN_DMA_CFG);
-	else
-		write_scc(priv, R1, EXT_INT_ENAB | WT_FN_RDYFN);
-	/* Disable DMA */
-	if (priv->param.dma >= 0)
-		disable_dma(priv->param.dma);
-}
-
-
-static void start_timer(struct scc_priv *priv, int t, int r15)
-{
-	outb(priv->tmr_mode, priv->tmr_ctrl);
-	if (t == 0) {
-		tm_isr(priv);
-	} else if (t > 0) {
-		outb(t & 0xFF, priv->tmr_cnt);
-		outb((t >> 8) & 0xFF, priv->tmr_cnt);
-		if (priv->type != TYPE_TWIN) {
-			write_scc(priv, R15, r15 | CTSIE);
-			priv->rr0 |= CTS;
-		}
-	}
-}
-
-
-static inline unsigned char random(void)
-{
-	/* See "Numerical Recipes in C", second edition, p. 284 */
-	rand = rand * 1664525L + 1013904223L;
-	return (unsigned char) (rand >> 24);
-}
-
-static inline void z8530_isr(struct scc_info *info)
-{
-	int is, i = 100;
-
-	while ((is = read_scc(&info->priv[0], R3)) && i--) {
-		if (is & CHARxIP) {
-			rx_isr(&info->priv[0]);
-		} else if (is & CHATxIP) {
-			tx_isr(&info->priv[0]);
-		} else if (is & CHAEXT) {
-			es_isr(&info->priv[0]);
-		} else if (is & CHBRxIP) {
-			rx_isr(&info->priv[1]);
-		} else if (is & CHBTxIP) {
-			tx_isr(&info->priv[1]);
-		} else {
-			es_isr(&info->priv[1]);
-		}
-		write_scc(&info->priv[0], R0, RES_H_IUS);
-		i++;
-	}
-	if (i < 0) {
-		printk(KERN_ERR "dmascc: stuck in ISR with RR3=0x%02x.\n",
-		       is);
-	}
-	/* Ok, no interrupts pending from this 8530. The INT line should
-	   be inactive now. */
-}
-
-
-static irqreturn_t scc_isr(int irq, void *dev_id)
-{
-	struct scc_info *info = dev_id;
-
-	spin_lock(info->priv[0].register_lock);
-	/* At this point interrupts are enabled, and the interrupt under service
-	   is already acknowledged, but masked off.
-
-	   Interrupt processing: We loop until we know that the IRQ line is
-	   low. If another positive edge occurs afterwards during the ISR,
-	   another interrupt will be triggered by the interrupt controller
-	   as soon as the IRQ level is enabled again (see asm/irq.h).
-
-	   Bottom-half handlers will be processed after scc_isr(). This is
-	   important, since we only have small ringbuffers and want new data
-	   to be fetched/delivered immediately. */
-
-	if (info->priv[0].type == TYPE_TWIN) {
-		int is, card_base = info->priv[0].card_base;
-		while ((is = ~inb(card_base + TWIN_INT_REG)) &
-		       TWIN_INT_MSK) {
-			if (is & TWIN_SCC_MSK) {
-				z8530_isr(info);
-			} else if (is & TWIN_TMR1_MSK) {
-				inb(card_base + TWIN_CLR_TMR1);
-				tm_isr(&info->priv[0]);
-			} else {
-				inb(card_base + TWIN_CLR_TMR2);
-				tm_isr(&info->priv[1]);
-			}
-		}
-	} else
-		z8530_isr(info);
-	spin_unlock(info->priv[0].register_lock);
-	return IRQ_HANDLED;
-}
-
-
-static void rx_isr(struct scc_priv *priv)
-{
-	if (priv->param.dma >= 0) {
-		/* Check special condition and perform error reset. See 2.4.7.5. */
-		special_condition(priv, read_scc(priv, R1));
-		write_scc(priv, R0, ERR_RES);
-	} else {
-		/* Check special condition for each character. Error reset not necessary.
-		   Same algorithm for SCC and ESCC. See 2.4.7.1 and 2.4.7.4. */
-		int rc;
-		while (read_scc(priv, R0) & Rx_CH_AV) {
-			rc = read_scc(priv, R1);
-			if (priv->rx_ptr < BUF_SIZE)
-				priv->rx_buf[priv->rx_head][priv->
-							    rx_ptr++] =
-				    read_scc_data(priv);
-			else {
-				priv->rx_over = 2;
-				read_scc_data(priv);
-			}
-			special_condition(priv, rc);
-		}
-	}
-}
-
-
-static void special_condition(struct scc_priv *priv, int rc)
-{
-	int cb;
-	unsigned long flags;
-
-	/* See Figure 2-15. Only overrun and EOF need to be checked. */
-
-	if (rc & Rx_OVR) {
-		/* Receiver overrun */
-		priv->rx_over = 1;
-		if (priv->param.dma < 0)
-			write_scc(priv, R0, ERR_RES);
-	} else if (rc & END_FR) {
-		/* End of frame. Get byte count */
-		if (priv->param.dma >= 0) {
-			flags = claim_dma_lock();
-			cb = BUF_SIZE - get_dma_residue(priv->param.dma) -
-			    2;
-			release_dma_lock(flags);
-		} else {
-			cb = priv->rx_ptr - 2;
-		}
-		if (priv->rx_over) {
-			/* We had an overrun */
-			priv->dev->stats.rx_errors++;
-			if (priv->rx_over == 2)
-				priv->dev->stats.rx_length_errors++;
-			else
-				priv->dev->stats.rx_fifo_errors++;
-			priv->rx_over = 0;
-		} else if (rc & CRC_ERR) {
-			/* Count invalid CRC only if packet length >= minimum */
-			if (cb >= 15) {
-				priv->dev->stats.rx_errors++;
-				priv->dev->stats.rx_crc_errors++;
-			}
-		} else {
-			if (cb >= 15) {
-				if (priv->rx_count < NUM_RX_BUF - 1) {
-					/* Put good frame in FIFO */
-					priv->rx_len[priv->rx_head] = cb;
-					priv->rx_head =
-					    (priv->rx_head +
-					     1) % NUM_RX_BUF;
-					priv->rx_count++;
-					schedule_work(&priv->rx_work);
-				} else {
-					priv->dev->stats.rx_errors++;
-					priv->dev->stats.rx_over_errors++;
-				}
-			}
-		}
-		/* Get ready for new frame */
-		if (priv->param.dma >= 0) {
-			flags = claim_dma_lock();
-			set_dma_addr(priv->param.dma,
-				     virt_to_bus(priv->rx_buf[priv->rx_head]));
-			set_dma_count(priv->param.dma, BUF_SIZE);
-			release_dma_lock(flags);
-		} else {
-			priv->rx_ptr = 0;
-		}
-	}
-}
-
-
-static void rx_bh(struct work_struct *ugli_api)
-{
-	struct scc_priv *priv = container_of(ugli_api, struct scc_priv, rx_work);
-	int i = priv->rx_tail;
-	int cb;
-	unsigned long flags;
-	struct sk_buff *skb;
-	unsigned char *data;
-
-	spin_lock_irqsave(&priv->ring_lock, flags);
-	while (priv->rx_count) {
-		spin_unlock_irqrestore(&priv->ring_lock, flags);
-		cb = priv->rx_len[i];
-		/* Allocate buffer */
-		skb = dev_alloc_skb(cb + 1);
-		if (skb == NULL) {
-			/* Drop packet */
-			priv->dev->stats.rx_dropped++;
-		} else {
-			/* Fill buffer */
-			data = skb_put(skb, cb + 1);
-			data[0] = 0;
-			memcpy(&data[1], priv->rx_buf[i], cb);
-			skb->protocol = ax25_type_trans(skb, priv->dev);
-			netif_rx(skb);
-			priv->dev->stats.rx_packets++;
-			priv->dev->stats.rx_bytes += cb;
-		}
-		spin_lock_irqsave(&priv->ring_lock, flags);
-		/* Move tail */
-		priv->rx_tail = i = (i + 1) % NUM_RX_BUF;
-		priv->rx_count--;
-	}
-	spin_unlock_irqrestore(&priv->ring_lock, flags);
-}
-
-
-static void tx_isr(struct scc_priv *priv)
-{
-	int i = priv->tx_tail, p = priv->tx_ptr;
-
-	/* Suspend TX interrupts if we don't want to send anything.
-	   See Figure 2-22. */
-	if (p == priv->tx_len[i]) {
-		write_scc(priv, R0, RES_Tx_P);
-		return;
-	}
-
-	/* Write characters */
-	while ((read_scc(priv, R0) & Tx_BUF_EMP) && p < priv->tx_len[i]) {
-		write_scc_data(priv, priv->tx_buf[i][p++], 0);
-	}
-
-	/* Reset EOM latch of Z8530 */
-	if (!priv->tx_ptr && p && priv->chip == Z8530)
-		write_scc(priv, R0, RES_EOM_L);
-
-	priv->tx_ptr = p;
-}
-
-
-static void es_isr(struct scc_priv *priv)
-{
-	int i, rr0, drr0, res;
-	unsigned long flags;
-
-	/* Read status, reset interrupt bit (open latches) */
-	rr0 = read_scc(priv, R0);
-	write_scc(priv, R0, RES_EXT_INT);
-	drr0 = priv->rr0 ^ rr0;
-	priv->rr0 = rr0;
-
-	/* Transmit underrun (2.4.9.6). We can't check the TxEOM flag, since
-	   it might have already been cleared again by AUTOEOM. */
-	if (priv->state == TX_DATA) {
-		/* Get remaining bytes */
-		i = priv->tx_tail;
-		if (priv->param.dma >= 0) {
-			disable_dma(priv->param.dma);
-			flags = claim_dma_lock();
-			res = get_dma_residue(priv->param.dma);
-			release_dma_lock(flags);
-		} else {
-			res = priv->tx_len[i] - priv->tx_ptr;
-			priv->tx_ptr = 0;
-		}
-		/* Disable DREQ / TX interrupt */
-		if (priv->param.dma >= 0 && priv->type == TYPE_TWIN)
-			outb(0, priv->card_base + TWIN_DMA_CFG);
-		else
-			write_scc(priv, R1, EXT_INT_ENAB | WT_FN_RDYFN);
-		if (res) {
-			/* Update packet statistics */
-			priv->dev->stats.tx_errors++;
-			priv->dev->stats.tx_fifo_errors++;
-			/* Other underrun interrupts may already be waiting */
-			write_scc(priv, R0, RES_EXT_INT);
-			write_scc(priv, R0, RES_EXT_INT);
-		} else {
-			/* Update packet statistics */
-			priv->dev->stats.tx_packets++;
-			priv->dev->stats.tx_bytes += priv->tx_len[i];
-			/* Remove frame from FIFO */
-			priv->tx_tail = (i + 1) % NUM_TX_BUF;
-			priv->tx_count--;
-			/* Inform upper layers */
-			netif_wake_queue(priv->dev);
-		}
-		/* Switch state */
-		write_scc(priv, R15, 0);
-		if (priv->tx_count &&
-		    time_is_after_jiffies(priv->tx_start + priv->param.txtimeout)) {
-			priv->state = TX_PAUSE;
-			start_timer(priv, priv->param.txpause, 0);
-		} else {
-			priv->state = TX_TAIL;
-			start_timer(priv, priv->param.txtail, 0);
-		}
-	}
-
-	/* DCD transition */
-	if (drr0 & DCD) {
-		if (rr0 & DCD) {
-			switch (priv->state) {
-			case IDLE:
-			case WAIT:
-				priv->state = DCD_ON;
-				write_scc(priv, R15, 0);
-				start_timer(priv, priv->param.dcdon, 0);
-			}
-		} else {
-			switch (priv->state) {
-			case RX_ON:
-				rx_off(priv);
-				priv->state = DCD_OFF;
-				write_scc(priv, R15, 0);
-				start_timer(priv, priv->param.dcdoff, 0);
-			}
-		}
-	}
-
-	/* CTS transition */
-	if ((drr0 & CTS) && (~rr0 & CTS) && priv->type != TYPE_TWIN)
-		tm_isr(priv);
-
-}
-
-
-static void tm_isr(struct scc_priv *priv)
-{
-	switch (priv->state) {
-	case TX_HEAD:
-	case TX_PAUSE:
-		tx_on(priv);
-		priv->state = TX_DATA;
-		break;
-	case TX_TAIL:
-		write_scc(priv, R5, TxCRC_ENAB | Tx8);
-		priv->state = RTS_OFF;
-		if (priv->type != TYPE_TWIN)
-			write_scc(priv, R15, 0);
-		start_timer(priv, priv->param.rtsoff, 0);
-		break;
-	case RTS_OFF:
-		write_scc(priv, R15, DCDIE);
-		priv->rr0 = read_scc(priv, R0);
-		if (priv->rr0 & DCD) {
-			priv->dev->stats.collisions++;
-			rx_on(priv);
-			priv->state = RX_ON;
-		} else {
-			priv->state = WAIT;
-			start_timer(priv, priv->param.waittime, DCDIE);
-		}
-		break;
-	case WAIT:
-		if (priv->tx_count) {
-			priv->state = TX_HEAD;
-			priv->tx_start = jiffies;
-			write_scc(priv, R5,
-				  TxCRC_ENAB | RTS | TxENAB | Tx8);
-			write_scc(priv, R15, 0);
-			start_timer(priv, priv->param.txdelay, 0);
-		} else {
-			priv->state = IDLE;
-			if (priv->type != TYPE_TWIN)
-				write_scc(priv, R15, DCDIE);
-		}
-		break;
-	case DCD_ON:
-	case DCD_OFF:
-		write_scc(priv, R15, DCDIE);
-		priv->rr0 = read_scc(priv, R0);
-		if (priv->rr0 & DCD) {
-			rx_on(priv);
-			priv->state = RX_ON;
-		} else {
-			priv->state = WAIT;
-			start_timer(priv,
-				    random() / priv->param.persist *
-				    priv->param.slottime, DCDIE);
-		}
-		break;
-	}
-}