patch-2.2.16 linux/drivers/net/hd6457x.c

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diff -urN v2.2.15/linux/drivers/net/hd6457x.c linux/drivers/net/hd6457x.c
@@ -0,0 +1,785 @@
+/*
+ * Hitachi SCA HD64570 and HD64572 common driver for Linux
+ *
+ * Copyright (C) 1998-2000 Krzysztof Halasa <khc@pm.waw.pl>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Sources of information:
+ *    Hitachi HD64570 SCA User's Manual
+ *    Hitachi HD64572 SCA-II User's Manual
+ *
+ *
+ * Some details:
+ * dev->tbusy bit 0 is used as hard_start_xmit lock
+ *	      bit 1 is a xmit buffer full flag (set by xmit, cleared by intr)
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/malloc.h>
+#include <linux/sched.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/interrupt.h>
+#include <linux/in.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+
+#include <asm/system.h>
+#include <asm/bitops.h>
+#include <asm/uaccess.h>
+#include <asm/io.h>
+
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+
+#include <linux/hdlc.h>
+
+#if (!defined (__HD64570_H) && !defined (__HD64572_H)) || \
+    (defined (__HD64570_H) && defined (__HD64572_H))
+#error Either hd64570.h or hd64572.h must be included
+#endif
+
+
+static card_t *first_card=NULL;
+static card_t **new_card=&first_card;
+
+
+/* Maximum events to handle at each interrupt - should I increase it? */
+#define INTR_WORK 4
+
+#define get_msci(port)	  (phy_node(port) ?   MSCI1_OFFSET :   MSCI0_OFFSET)
+#define get_dmac_rx(port) (phy_node(port) ? DMAC1RX_OFFSET : DMAC0RX_OFFSET)
+#define get_dmac_tx(port) (phy_node(port) ? DMAC1TX_OFFSET : DMAC0TX_OFFSET)
+
+#define SCA_INTR_MSCI(node)    (node ? 0x10 : 0x01)
+#define SCA_INTR_DMAC_RX(node) (node ? 0x20 : 0x02)
+#define SCA_INTR_DMAC_TX(node) (node ? 0x40 : 0x04)
+
+#ifdef __HD64570_H /* HD64570 */
+#define sca_outa(value, reg, card)	sca_outw(value, reg, card)
+#define sca_ina(reg, card)		sca_inw(reg, card)
+#define writea(value, ptr)		writew(value, ptr)
+
+static __inline__ int sca_intr_status(card_t *card)
+{
+	u8 isr0 = sca_in(ISR0, card);
+	u8 isr1 = sca_in(ISR1, card);
+	u8 result = 0;
+
+	if (isr1 & 0x03) result |= SCA_INTR_DMAC_RX(0);
+	if (isr1 & 0x0C) result |= SCA_INTR_DMAC_TX(0);
+	if (isr1 & 0x30) result |= SCA_INTR_DMAC_RX(1);
+	if (isr1 & 0xC0) result |= SCA_INTR_DMAC_TX(1);
+	if (isr0 & 0x0F) result |= SCA_INTR_MSCI(0);
+	if (isr0 & 0xF0) result |= SCA_INTR_MSCI(1);
+
+	return result;
+}
+
+#else /* HD64572 */
+#define sca_outa(value, reg, card)	sca_outl(value, reg, card)
+#define sca_ina(reg, card)		sca_inl(reg, card)
+#define writea(value, ptr)		writel(value, ptr)
+
+
+static __inline__ int sca_intr_status(card_t *card)
+{
+	u32 isr0 = sca_inl(ISR0, card);
+	u8 result = 0;
+  
+	if (isr0 & 0x0000000F) result |= SCA_INTR_DMAC_RX(0);
+	if (isr0 & 0x000000F0) result |= SCA_INTR_DMAC_TX(0);
+	if (isr0 & 0x00000F00) result |= SCA_INTR_DMAC_RX(1);
+	if (isr0 & 0x0000F000) result |= SCA_INTR_DMAC_TX(1);
+	if (isr0 & 0x003E0000) result |= SCA_INTR_MSCI(0);
+	if (isr0 & 0x3E000000) result |= SCA_INTR_MSCI(1);
+
+	return result;
+}
+
+#endif /* HD64570 vs HD64572 */
+
+
+
+
+static __inline__ port_t* hdlc_to_port(hdlc_device *hdlc)
+{
+	return (port_t*)hdlc;
+}
+
+
+
+static __inline__ port_t* dev_to_port(struct device *dev)
+{
+	return hdlc_to_port(dev_to_hdlc(dev));
+}
+
+
+
+static __inline__ u8 next_desc(port_t *port, u8 desc)
+{
+	return (desc+1) % port_to_card(port)->ring_buffers;
+}
+
+
+
+static __inline__ u16 desc_offset(port_t *port, u8 desc, u8 transmit)
+{
+	/* Descriptor offset always fits in 16 bytes */
+	u8 buffs=port_to_card(port)->ring_buffers;
+	return ((log_node(port) * 2 + transmit) * buffs + (desc % buffs)) *
+		sizeof(pkt_desc);
+}
+
+
+
+static __inline__ pkt_desc* desc_address(port_t *port, u8 desc, u8 transmit)
+{
+#ifdef PAGE0_ALWAYS_MAPPED
+	return (pkt_desc*)(win0base(port_to_card(port))
+			   + desc_offset(port, desc, transmit));
+#else
+	return (pkt_desc*)(winbase(port_to_card(port))
+			   + desc_offset(port, desc, transmit));
+#endif  
+}
+
+
+
+static __inline__ u32 buffer_offset(port_t *port, u8 desc, u8 transmit)
+{
+	u8 buffs=port_to_card(port)->ring_buffers;
+	return port_to_card(port)->buff_offset +
+		((log_node(port) * 2 + transmit) * buffs + (desc % buffs)) *
+		(u32)HDLC_MAX_MTU;
+}
+
+
+
+static void sca_create_rings(port_t *port)
+{
+	card_t *card=port_to_card(port);
+	u8 transmit, i;
+	u16 dmac, buffs=card->ring_buffers;
+  
+#if !defined(PAGE0_ALWAYS_MAPPED) && !defined(ALL_PAGES_ALWAYS_MAPPED)
+	openwin(card, 0);
+#endif  
+
+	for (transmit=0; transmit<2; transmit++) {
+		for (i = 0; i<buffs; i++) {
+			pkt_desc* desc = desc_address(port, i, transmit);
+			u16 chain_off = desc_offset(port, i+1, transmit);
+			u32 buff_off = buffer_offset(port, i, transmit);
+      
+			writea(chain_off, &desc->cp);
+			writel(buff_off, &desc->bp);
+			writew(0, &desc->len);
+			writeb(0, &desc->stat);
+		}
+    
+		dmac = transmit ? get_dmac_tx(port) : get_dmac_rx(port);
+		/* DMA disable - to halt state */
+		sca_out(0, transmit ? DSR_TX(phy_node(port)) :
+			DSR_RX(phy_node(port)), card);
+		/* software ABORT - to initial state */
+		sca_out(DCR_ABORT, transmit ? DCR_TX(phy_node(port)) :
+			DCR_RX(phy_node(port)), card);
+    
+#ifdef __HD64570_H
+		sca_out(0, dmac+CPB, card); /* pointer base */
+#endif
+		/* current desc addr */
+		sca_outa(desc_offset(port, 0, transmit), dmac+CDAL, card);
+		if (!transmit)
+			sca_outa(desc_offset(port, buffs-1, transmit),
+				 dmac+EDAL, card);
+		else
+			sca_outa(desc_offset(port, 0, transmit), dmac+EDAL,
+				 card);
+    
+		/* clear frame end interrupt counter */
+		sca_out(DCR_CLEAR_EOF, transmit ? DCR_TX(phy_node(port)) :
+			DCR_RX(phy_node(port)), card);
+
+		if (!transmit) { /* Receive */
+			/* set buffer length */
+			sca_outw(HDLC_MAX_MTU, dmac+BFLL, card);
+			/* Chain mode, Multi-frame */
+			sca_out(0x14, DMR_RX(phy_node(port)), card);
+			sca_out(DIR_EOME|DIR_BOFE, DIR_RX(phy_node(port)),
+				card);
+			/* DMA enable */
+			sca_out(DSR_DE, DSR_RX(phy_node(port)), card);
+		} else {	/* Transmit */
+			/* Chain mode, Multi-frame */
+			sca_out(0x14, DMR_TX(phy_node(port)), card);
+			/* enable underflow interrupts */
+			sca_out(DIR_BOFE, DIR_TX(phy_node(port)), card);
+		}
+	}
+}
+
+
+
+static void sca_init_sync_port(port_t *port)
+{
+	port->rxin = 0;
+	port->txin = 0;
+	port->txlast = 0;
+	sca_create_rings(port);
+}
+
+
+
+/* MSCI interrupt service */
+static void sca_msci_intr(port_t *port)
+{
+	u16 msci=get_msci(port);
+	card_t* card=port_to_card(port);
+	u8 stat = sca_in(msci+ST1, card); /* read MSCI ST1 status */
+
+	/* printk(KERN_DEBUG "MSCI INT: ST1=%02X ILAR=%02X\n",
+	   stat, sca_in(ILAR, card)); */
+
+	/* Reset MSCI TX underrun status bit */
+	sca_out(stat & ST1_UDRN, msci+ST1, card);
+
+	if (stat & ST1_UDRN) {
+		port->hdlc.stats.tx_errors++; /* TX Underrun error detected */
+		port->hdlc.stats.tx_fifo_errors++;
+	}
+}
+
+
+
+/* Receive DMA interrupt service */
+static void sca_rx_intr(port_t *port)
+{
+	u16 dmac = get_dmac_rx(port);
+	card_t *card = port_to_card(port);
+	u8 stat = sca_in(DSR_RX(phy_node(port)), card); /* read DMA Status */
+
+	/* Reset DSR status bits */
+	sca_out((stat&(DSR_EOT|DSR_EOM|DSR_BOF|DSR_COF)) | DSR_DWE,
+		DSR_RX(phy_node(port)), card);
+
+	if (stat & DSR_BOF) {
+		port->hdlc.stats.rx_errors++; /* Dropped one or more frames */
+		port->hdlc.stats.rx_over_errors++;
+	}
+  
+	while (1) {
+		u32 desc_off = desc_offset(port, port->rxin, 0);
+		pkt_desc *desc;
+		u32 cda=sca_ina(dmac+CDAL, card);
+
+		if (cda == desc_off)
+			break;	/* No frame received */
+
+#ifdef __HD64572_H
+		if (cda == desc_off + 8)
+			break;	/* SCA-II updates CDA in 2 steps */
+#endif
+    
+		desc = desc_address(port, port->rxin, 0);
+		stat = readb(&desc->stat);
+		if (stat & ST_RX_OVERRUN) {
+			port->hdlc.stats.rx_errors++;
+			port->hdlc.stats.rx_fifo_errors++;
+		} else if (stat & ST_RX_CRC) {
+			port->hdlc.stats.rx_errors++;
+			port->hdlc.stats.rx_crc_errors++;
+		} else if ((stat & (ST_RX_SHORT|ST_RX_ABORT|ST_RX_RESBIT)) ||
+			   !(stat & (ST_RX_EOM))) {
+			port->hdlc.stats.rx_errors++; /* Malformed frame */
+			port->hdlc.stats.rx_frame_errors++;
+		} else {
+			u16 len = readw(&desc->len);
+			struct sk_buff *skb = dev_alloc_skb(len);
+			if (!skb)
+				port->hdlc.stats.rx_dropped++;
+			else {
+#ifdef DEBUG_PKT
+				int i;
+#endif
+				u32 buff = buffer_offset(port, port->rxin, 0);
+#ifndef ALL_PAGES_ALWAYS_MAPPED
+				u32 maxlen;
+				u8 page = buff / winsize(card);
+				buff = buff % winsize(card);
+				maxlen = winsize(card) - buff;
+	
+				openwin(card, page);
+
+				if (len > maxlen) {
+					memcpy_fromio(skb->data,
+						      winbase(card) + buff,
+						      maxlen);
+					openwin(card, page+1);
+					memcpy_fromio(skb->data + maxlen,
+						      winbase(card),
+						      len - maxlen);
+				} else
+#endif
+					memcpy_fromio(skb->data,
+						      winbase(card) + buff,
+						      len);
+
+#if !defined(PAGE0_ALWAYS_MAPPED) && !defined(ALL_PAGES_ALWAYS_MAPPED)
+				/* select pkt_desc table page back */
+				openwin(card, 0);
+#endif
+				skb_put(skb, len);
+	
+#ifdef DEBUG_PKT
+				printk(KERN_DEBUG "%s RX:", port->hdlc.name);
+				for (i=920; i<skb->len; i++)
+					printk(" %02X", skb->data[i]);
+				printk("\n");
+#endif
+
+				hdlc_netif_rx(&port->hdlc, skb, 0);
+			}
+		}
+
+		/* Set new error descriptor address */
+		sca_outa(desc_off, dmac+EDAL, card);
+		port->rxin = next_desc(port, port->rxin);
+	}
+
+	/* make sure RX DMA is enabled */
+	sca_out(DSR_DE, DSR_RX(phy_node(port)), card);
+}
+
+
+
+/* Transmit DMA interrupt service */
+static void sca_tx_intr(port_t *port)
+{
+	u16 dmac = get_dmac_tx(port);
+	card_t* card=port_to_card(port);
+	u8 stat = sca_in(DSR_TX(phy_node(port)), card); /* read DMA Status */
+
+	/* Reset DSR status bits */
+	sca_out((stat&(DSR_EOT|DSR_EOM|DSR_BOF|DSR_COF)) | DSR_DWE,
+		DSR_TX(phy_node(port)), card);
+
+	while (1) {
+		u32 desc_off = desc_offset(port, port->txlast, 1);
+		pkt_desc *desc;
+		u16 len;
+
+		if (sca_ina(dmac+CDAL, card) == desc_off)
+			break;	/* Transmitter is/will_be sending this frame */
+
+		desc = desc_address(port, port->txlast, 1);
+		len=readw(&desc->len);
+
+		port->hdlc.stats.tx_packets++;
+		port->hdlc.stats.tx_bytes+=len;
+		writeb(0, &desc->stat);	/* Free descriptor */
+
+		port->txlast = (port->txlast + 1) %
+			port_to_card(port)->ring_buffers;
+	}
+
+	if (test_and_clear_bit(1, &(hdlc_to_dev(&port->hdlc)->tbusy)))
+		mark_bh(NET_BH); /* Tell upper layers */
+}
+
+
+
+static void sca_intr(int irq, void* dev_id, struct pt_regs *regs)
+{
+	card_t *card=dev_id;
+	int boguscnt = INTR_WORK;
+	int i;
+	u8 stat;
+
+#ifndef ALL_PAGES_ALWAYS_MAPPED
+	u8 page = get_page(card);
+#endif
+  
+	while((stat = sca_intr_status(card)) != 0) {
+		for (i=0; i<2; i++) {
+			port_t *port=get_port(card, i);
+			if (port) {
+				if (stat & SCA_INTR_MSCI(i))
+					sca_msci_intr(port);
+	
+				if (stat & SCA_INTR_DMAC_RX(i))
+					sca_rx_intr(port);
+	
+				if (stat & SCA_INTR_DMAC_TX(i))
+					sca_tx_intr(port);
+			}
+
+			if (--boguscnt < 0) {
+				printk(KERN_ERR "%s: too much work at "
+				       "interrupt\n", port->hdlc.name);
+				goto exit;
+			}
+		}
+	}
+  
+ exit:
+#ifndef ALL_PAGES_ALWAYS_MAPPED
+	openwin(card, page);		/* Restore original page */
+#endif
+}
+
+
+
+static inline void sca_set_loopback(port_t *port, int loopback)
+{
+	card_t* card=port_to_card(port);
+	u8 msci = get_msci(port);
+	u8 md2 = sca_in(msci+MD2, card);
+
+	if (loopback)
+		md2 |= MD2_LOOPBACK;
+	else
+		md2 &= ~MD2_LOOPBACK;
+
+	sca_out(md2, msci+MD2, card);
+	port->loopback = loopback;
+}
+
+
+
+static int sca_set_clock(port_t *port, int clock)
+{
+	card_t *card=port_to_card(port);
+	u8 msci=get_msci(port);
+
+	u8 result=set_clock(port, clock); /* Card-dependent settings */
+	if (result)
+		return result;
+
+	if (port->clkmode != LINE_EXT_CLOCK) {
+		unsigned int tmc, br=10, brv=1024;
+
+		do {
+			br--;
+			brv>>=1; /* brv=2^9=512 max in specs */
+
+			/* Baud Rate = CLOCK_BASE / TMC / 2^BR */
+			tmc=CLOCK_BASE / (brv*port->clkmode);
+		}while(br>1 && tmc<=128); /* Try lower br for better accuracy*/
+
+		if (tmc<1) {
+			tmc=1;
+			br=0;	/* For baud=CLOCK_BASE we use tmc=1 br=0 */
+			brv=1;
+		}
+		else if (tmc>255)
+			tmc=256; /* tmc=0 means 256 - low baud rates */
+
+		port->clkmode=CLOCK_BASE/(brv*tmc);
+		printk(KERN_INFO "%s: using internal clock %u. br=%d, "
+		       "tmc=%d\n", port->hdlc.name, port->clkmode, br, tmc);
+    
+		/* baud divisor - time constant*/
+#ifdef __HD64570_H
+		sca_out(tmc, msci+TMC, card);
+#else
+		sca_out(tmc, msci+TMCR, card);
+		sca_out(tmc, msci+TMCT, card);
+#endif    
+		sca_out(CLK_BRG_RX|br, msci+RXS, card); /* BRG output */
+		sca_out(CLK_BRG_TX|br, msci+TXS, card); /* BRG output */
+	} else {
+#ifdef __HD64570_H
+		sca_out(1, msci+TMC, card);
+#else
+		sca_out(1, msci+TMCR, card);
+		sca_out(1, msci+TMCT, card);
+#endif    
+		sca_out(CLK_LINE_RX, msci+RXS, card); /* RXC - line input */
+		sca_out(CLK_LINE_TX, msci+TXS, card); /* TXC input */
+	}
+
+	return 0;
+}
+
+
+
+static void sca_set_hdlc_mode(port_t *port, u8 idle, u8 crc, u8 nrzi)
+{
+	card_t* card=port_to_card(port);
+	u8 msci = get_msci(port);
+	u8 md2 = (nrzi ? MD2_NRZI : 0) | (port->loopback ? MD2_LOOPBACK : 0);
+	u8 ctl = (idle ? CTL_IDLE : 0);
+#ifdef __HD64572_H
+	ctl |= CTL_URCT | CTL_URSKP; /* Skip the rest of underrun frame */
+#endif
+
+	sca_out(CMD_RESET, msci+CMD, card);
+	sca_out(MD0_HDLC|crc, msci+MD0, card);
+	sca_out(0x00, msci+MD1, card); /* no address field check */
+	sca_out(md2, msci+MD2, card);
+	sca_out(0x7E, msci+IDL, card); /* flag character 0x7E */
+	sca_out(ctl, msci+CTL, card);
+
+#ifdef __HD64570_H
+	/* Allow at least 8 bytes before requesting RX DMA operation */
+	/* TX with higher priority and possibly with shorter transfers */
+	sca_out(0x07, msci+RRC, card); /* +1=RXRDY/DMA activation condition */
+	sca_out(0x10, msci+TRC0, card); /* = TXRDY/DMA activation condition */
+	sca_out(0x14, msci+TRC1, card); /* +1=TXRDY/DMA deactiv condition */
+#else
+	sca_out(0x0F, msci+RNR, card); /* +1=RX DMA activation condition */
+	/* Setting than to larger value may cause Illegal Access */
+	sca_out(0x20, msci+TNR0, card); /* =TX DMA activation condition */
+	sca_out(0x30, msci+TNR1, card); /* +1=TX DMA deactivation condition */
+	sca_out(0x04, msci+TCR, card); /* =Critical TX DMA activ condition */
+#endif
+
+	sca_set_clock(port, port->clkmode);
+	open_port(port);
+  
+#ifdef __HD64570_H
+	/* MSCI TX INT IRQ enable */
+	sca_out(IE0_TXINT, msci+IE0, card);
+	sca_out(IE1_UDRN, msci+IE1, card); /* TX underrun IRQ */
+	sca_out(sca_in(IER0, card) | (phy_node(port) ? 0x80 : 0x08),
+		IER0, card);
+	/* DMA IRQ enable */
+	sca_out(sca_in(IER1, card) | (phy_node(port) ? 0xF0 : 0x0F),
+		IER1, card);
+#else
+	/* MSCI TX INT and underrrun IRQ enable */
+	sca_outl(IE0_TXINT|IE0_UDRN, msci+IE0, card);
+	/* DMA & MSCI IRQ enable */
+	sca_outl(sca_in(IER0, card) |
+		 (phy_node(port) ? 0x02006600 : 0x00020066), IER0, card);
+#endif
+
+	sca_out(CMD_TX_ENABLE, msci+CMD, card);
+	sca_out(CMD_RX_ENABLE, msci+CMD, card);
+}
+
+
+
+static int sca_ioctl(hdlc_device *hdlc, struct ifreq *ifr, int cmd)
+{
+	int value;
+	port_t *port=hdlc_to_port(hdlc);
+#ifdef DEBUG_RINGS
+	card_t *card=port_to_card(port);
+	u16 cnt;
+#if !defined(PAGE0_ALWAYS_MAPPED) && !defined(ALL_PAGES_ALWAYS_MAPPED)
+	u8 page;
+#endif
+#endif
+
+	if(!capable(CAP_NET_ADMIN))
+		return -EPERM;
+
+	switch(cmd) {
+	case HDLCSETLINE:
+		value = ifr->ifr_ifru.ifru_ivalue;
+		switch (value) {
+		case LINE_LOOPBACK:
+			sca_set_loopback(port, 1);
+			return 0;
+
+		case LINE_NOLOOPBACK:
+			sca_set_loopback(port, 0);
+			return 0;
+
+		default:
+			if (value == LINE_EXT_CLOCK || value >= LINE_MIN_CLOCK)
+				return sca_set_clock(port, value);
+		}
+		return select_phys_iface(port, value); /* Last resort */
+		
+#ifdef DEBUG_RINGS
+	default:
+#if !defined(PAGE0_ALWAYS_MAPPED) && !defined(ALL_PAGES_ALWAYS_MAPPED)
+		page=get_page(card);
+		openwin(card, 0);
+#endif
+
+		printk(KERN_ERR "RX ring: CDA=%u EDA=%u DSR=%02X in=%u "
+		       "%sactive",
+		       sca_ina(get_dmac_rx(port)+CDAL, card),
+		       sca_ina(get_dmac_rx(port)+EDAL, card),
+		       sca_in(DSR_RX(phy_node(port)), card),
+		       port->rxin,
+		       sca_in(DSR_RX(phy_node(port)), card) & DSR_DE?"":"in");
+		for (cnt=0; cnt<port_to_card(port)->ring_buffers; cnt++)
+			printk(" %02X",
+			       readb(&(desc_address(port, cnt, 0)->stat)));
+		
+		printk("\n" KERN_ERR "TX ring: CDA=%u EDA=%u DSR=%02X in=%u "
+		       "last=%u %sactive",
+		       sca_ina(get_dmac_tx(port)+CDAL, card),
+		       sca_ina(get_dmac_tx(port)+EDAL, card),
+		       sca_in(DSR_TX(phy_node(port)), card), port->txin,
+		       port->txlast,
+		       sca_in(DSR_TX(phy_node(port)), card) & DSR_DE?"":"in");
+      
+		for (cnt=0; cnt<port_to_card(port)->ring_buffers; cnt++)
+			printk(" %02X",
+			       readb(&(desc_address(port, cnt, 1)->stat)));
+		printk("\n");
+
+		printk(KERN_ERR "MSCI: MD: %02x %02x %02x, "
+		       "ST: %02x %02x %02x %02x"
+#ifdef __HD64572_H
+		       " %02x"
+#endif
+		       ", FST: %02x CST: %02x %02x\n",
+		       sca_in(get_msci(port)+MD0, card),
+		       sca_in(get_msci(port)+MD1, card),
+		       sca_in(get_msci(port)+MD2, card),
+		       sca_in(get_msci(port)+ST0, card),
+		       sca_in(get_msci(port)+ST1, card),
+		       sca_in(get_msci(port)+ST2, card),
+		       sca_in(get_msci(port)+ST3, card),
+#ifdef __HD64572_H
+		       sca_in(get_msci(port)+ST4, card),
+#endif
+		       sca_in(get_msci(port)+FST, card),
+		       sca_in(get_msci(port)+CST0, card),
+		       sca_in(get_msci(port)+CST1, card));
+
+#ifdef __HD64572_H
+		printk(KERN_ERR "ILAR: %02x\n", sca_in(ILAR, card));
+#endif
+
+#if !defined(PAGE0_ALWAYS_MAPPED) && !defined(ALL_PAGES_ALWAYS_MAPPED)
+		openwin(card, page); /* Restore original page */
+#endif
+		return 0;
+#endif /* DEBUG_RINGS */
+	}
+	return -EINVAL;
+}
+
+
+
+static int sca_open(hdlc_device *hdlc)
+{
+	port_t *port=hdlc_to_port(hdlc);
+
+	MOD_INC_USE_COUNT;
+	sca_set_hdlc_mode(port, 1, MD0_CRC_ITU, 0);
+	return 0;
+}
+
+
+static void sca_close(hdlc_device *hdlc)
+{
+	port_t *port=hdlc_to_port(hdlc);
+
+	/* reset channel */
+	sca_out(CMD_RESET, get_msci(port) + CMD, port_to_card(port));
+	close_port(port);
+	MOD_DEC_USE_COUNT;
+}
+
+
+
+static int sca_xmit(struct sk_buff *skb, struct device *dev)
+{
+	port_t *port = dev_to_port(dev);
+	card_t *card = port_to_card(port);
+	pkt_desc *desc;
+	u32 buff, len;
+#ifndef ALL_PAGES_ALWAYS_MAPPED
+	u8 page;
+	u32 maxlen;
+#endif
+
+#ifdef DEBUG_PKT
+	int i;
+#endif
+
+	/* We assume SCA/SCA-II never hangs */
+	if (test_bit(1, &dev->tbusy)) /* Transmitter buffer still full */
+		return 1;
+
+	/* Block a transmit from overlapping.
+	   Would waiting on semaphore here be more effective? */
+	if (test_and_set_bit(0, &dev->tbusy))
+		return 1;
+
+	desc = desc_address(port, port->txin+1, 1);
+	if (readb(&desc->stat)) { /* allow 1 packet gap */
+#ifdef DEBUG_PKT
+		printk(KERN_DEBUG "%s: transmitter buffer full\n", dev->name);
+#endif
+		set_bit(1, &dev->tbusy); /* Transmitter buffer full */
+		clear_bit(0, &dev->tbusy); /* no hard_start_xmit running */
+		return 1;	/* request packet to be queued */
+	}
+
+#ifdef DEBUG_PKT
+	printk(KERN_DEBUG "%s TX:", dev->name);
+	for (i=0; i<skb->len; i++)
+		printk(" %02X", skb->data[i]);
+	printk("\n");
+#endif
+
+	desc = desc_address(port, port->txin, 1);
+	buff = buffer_offset(port, port->txin, 1);
+	len = skb->len;
+#ifndef ALL_PAGES_ALWAYS_MAPPED
+	page = buff / winsize(card);
+	buff = buff % winsize(card);
+	maxlen = winsize(card) - buff;
+  
+	openwin(card, page);
+	if (len > maxlen) {
+		memcpy_toio(winbase(card) + buff, skb->data, maxlen);
+		openwin(card, page+1);
+		memcpy_toio(winbase(card), skb->data + maxlen, len - maxlen);
+	}
+	else
+#endif
+		memcpy_toio(winbase(card) + buff, skb->data, len);
+
+#if !defined(PAGE0_ALWAYS_MAPPED) && !defined(ALL_PAGES_ALWAYS_MAPPED)
+	openwin(card, 0);	/* select pkt_desc table page back */
+#endif
+	writew(len, &desc->len);
+	writeb(ST_TX_EOM, &desc->stat);
+
+	port->txin = next_desc(port, port->txin);
+	sca_outa(desc_offset(port, port->txin, 1),
+		 get_dmac_tx(port)+EDAL, card);
+  
+	sca_out(DSR_DE, DSR_TX(phy_node(port)), card); /* Enable TX DMA */
+	clear_bit(0, &dev->tbusy); /* no hard_start_xmit running */
+
+	dev_kfree_skb(skb);
+	return 0;
+}
+
+
+static void sca_init(card_t *card, int wait_states)
+{
+	sca_out(wait_states, WCRL, card); /* Wait Control */
+	sca_out(wait_states, WCRM, card);
+	sca_out(wait_states, WCRH, card);
+
+	sca_out(0, DMER, card);	/* DMA Master disable */
+	sca_out(0x03, PCR, card); /* DMA priority */
+	sca_out(0, IER1, card);	/* DMA interrupt disable */
+	sca_out(0, DSR_RX(0), card); /* DMA disable - to halt state */
+	sca_out(0, DSR_TX(0), card);
+	sca_out(0, DSR_RX(1), card);
+	sca_out(0, DSR_TX(1), card);
+	sca_out(DMER_DME, DMER, card); /* DMA Master enable */
+}
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)