WAN: split hd6457x.c into hd64570.c and hd64572.c

Supporting both original SCA and SCA-II in one file was nice at some
point but now it's increasingly painful.

Signed-off-by: Krzysztof Hałasa <khc@pm.waw.pl>

1 files changed, 867 insertions, 0 deletions

diff --git a/drivers/net/wan/hd64570.c b/drivers/net/wan/hd64570.c
new file mode 100644
index 000000000000..434583a94b32
--- /dev/null
+++ b/drivers/net/wan/hd64570.c
@@ -0,0 +1,867 @@
+/*
+ * Hitachi SCA HD64570 and HD64572 common driver for Linux
+ *
+ * Copyright (C) 1998-2003 Krzysztof Halasa <khc@pm.waw.pl>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License
+ * as published by the Free Software Foundation.
+ *
+ * Sources of information:
+ *    Hitachi HD64570 SCA User's Manual
+ *    Hitachi HD64572 SCA-II User's Manual
+ *
+ * We use the following SCA memory map:
+ *
+ * Packet buffer descriptor rings - starting from winbase or win0base:
+ * rx_ring_buffers * sizeof(pkt_desc) = logical channel #0 RX ring
+ * tx_ring_buffers * sizeof(pkt_desc) = logical channel #0 TX ring
+ * rx_ring_buffers * sizeof(pkt_desc) = logical channel #1 RX ring (if used)
+ * tx_ring_buffers * sizeof(pkt_desc) = logical channel #1 TX ring (if used)
+ *
+ * Packet data buffers - starting from winbase + buff_offset:
+ * rx_ring_buffers * HDLC_MAX_MRU     = logical channel #0 RX buffers
+ * tx_ring_buffers * HDLC_MAX_MRU     = logical channel #0 TX buffers
+ * rx_ring_buffers * HDLC_MAX_MRU     = logical channel #0 RX buffers (if used)
+ * tx_ring_buffers * HDLC_MAX_MRU     = logical channel #0 TX buffers (if used)
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/jiffies.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/interrupt.h>
+#include <linux/in.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/bitops.h>
+
+#include <asm/system.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
+
+#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)
+
+#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)
+#endif
+
+static inline struct net_device *port_to_dev(port_t *port)
+{
+        return port->dev;
+}
+
+static inline int sca_intr_status(card_t *card)
+{
+        u8 result = 0;
+
+#ifdef __HD64570_H /* HD64570 */
+        u8 isr0 = sca_in(ISR0, card);
+        u8 isr1 = sca_in(ISR1, card);
+
+        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);
+
+#else /* HD64572 */
+        u32 isr0 = sca_inl(ISR0, card);
+
+        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);
+
+#endif /* HD64570 vs HD64572 */
+
+        if (!(result & SCA_INTR_DMAC_TX(0)))
+                if (sca_in(DSR_TX(0), card) & DSR_EOM)
+                        result |= SCA_INTR_DMAC_TX(0);
+        if (!(result & SCA_INTR_DMAC_TX(1)))
+                if (sca_in(DSR_TX(1), card) & DSR_EOM)
+                        result |= SCA_INTR_DMAC_TX(1);
+
+        return result;
+}
+
+static inline port_t* dev_to_port(struct net_device *dev)
+{
+        return dev_to_hdlc(dev)->priv;
+}
+
+static inline u16 next_desc(port_t *port, u16 desc, int transmit)
+{
+        return (desc + 1) % (transmit ? port_to_card(port)->tx_ring_buffers
+                             : port_to_card(port)->rx_ring_buffers);
+}
+
+
+
+static inline u16 desc_abs_number(port_t *port, u16 desc, int transmit)
+{
+        u16 rx_buffs = port_to_card(port)->rx_ring_buffers;
+        u16 tx_buffs = port_to_card(port)->tx_ring_buffers;
+
+        desc %= (transmit ? tx_buffs : rx_buffs); // called with "X + 1" etc.
+        return log_node(port) * (rx_buffs + tx_buffs) +
+                transmit * rx_buffs + desc;
+}
+
+
+
+static inline u16 desc_offset(port_t *port, u16 desc, int transmit)
+{
+        /* Descriptor offset always fits in 16 bytes */
+        return desc_abs_number(port, desc, transmit) * sizeof(pkt_desc);
+}
+
+
+
+static inline pkt_desc __iomem *desc_address(port_t *port, u16 desc, int transmit)
+{
+#ifdef PAGE0_ALWAYS_MAPPED
+        return (pkt_desc __iomem *)(win0base(port_to_card(port))
+                           + desc_offset(port, desc, transmit));
+#else
+        return (pkt_desc __iomem *)(winbase(port_to_card(port))
+                           + desc_offset(port, desc, transmit));
+#endif
+}
+
+
+
+static inline u32 buffer_offset(port_t *port, u16 desc, int transmit)
+{
+        return port_to_card(port)->buff_offset +
+                desc_abs_number(port, desc, transmit) * (u32)HDLC_MAX_MRU;
+}
+
+
+static inline void sca_set_carrier(port_t *port)
+{
+        if (!(sca_in(get_msci(port) + ST3, port_to_card(port)) & ST3_DCD)) {
+#ifdef DEBUG_LINK
+                printk(KERN_DEBUG "%s: sca_set_carrier on\n",
+                       port_to_dev(port)->name);
+#endif
+                netif_carrier_on(port_to_dev(port));
+        } else {
+#ifdef DEBUG_LINK
+                printk(KERN_DEBUG "%s: sca_set_carrier off\n",
+                       port_to_dev(port)->name);
+#endif
+                netif_carrier_off(port_to_dev(port));
+        }
+}
+
+
+static void sca_init_sync_port(port_t *port)
+{
+        card_t *card = port_to_card(port);
+        int transmit, i;
+
+        port->rxin = 0;
+        port->txin = 0;
+        port->txlast = 0;
+
+#if !defined(PAGE0_ALWAYS_MAPPED) && !defined(ALL_PAGES_ALWAYS_MAPPED)
+        openwin(card, 0);
+#endif
+
+        for (transmit = 0; transmit < 2; transmit++) {
+                u16 dmac = transmit ? get_dmac_tx(port) : get_dmac_rx(port);
+                u16 buffs = transmit ? card->tx_ring_buffers
+                        : card->rx_ring_buffers;
+
+                for (i = 0; i < buffs; i++) {
+                        pkt_desc __iomem *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);
+                }
+
+                /* 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_MRU, 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);
+                }
+        }
+        sca_set_carrier(port);
+}
+
+
+
+#ifdef NEED_SCA_MSCI_INTR
+/* MSCI interrupt service */
+static inline 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 */
+
+        /* Reset MSCI TX underrun and CDCD status bit */
+        sca_out(stat & (ST1_UDRN | ST1_CDCD), msci + ST1, card);
+
+        if (stat & ST1_UDRN) {
+                /* TX Underrun error detected */
+                port_to_dev(port)->stats.tx_errors++;
+                port_to_dev(port)->stats.tx_fifo_errors++;
+        }
+
+        if (stat & ST1_CDCD)
+                sca_set_carrier(port);
+}
+#endif
+
+
+
+static inline void sca_rx(card_t *card, port_t *port, pkt_desc __iomem *desc, u16 rxin)
+{
+        struct net_device *dev = port_to_dev(port);
+        struct sk_buff *skb;
+        u16 len;
+        u32 buff;
+#ifndef ALL_PAGES_ALWAYS_MAPPED
+        u32 maxlen;
+        u8 page;
+#endif
+
+        len = readw(&desc->len);
+        skb = dev_alloc_skb(len);
+        if (!skb) {
+                dev->stats.rx_dropped++;
+                return;
+        }
+
+        buff = buffer_offset(port, rxin, 0);
+#ifndef ALL_PAGES_ALWAYS_MAPPED
+        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(%i):", dev->name, skb->len);
+        debug_frame(skb);
+#endif
+        dev->stats.rx_packets++;
+        dev->stats.rx_bytes += skb->len;
+        skb->protocol = hdlc_type_trans(skb, dev);
+        netif_rx(skb);
+}
+
+
+
+/* Receive DMA interrupt service */
+static inline void sca_rx_intr(port_t *port)
+{
+        struct net_device *dev = port_to_dev(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)
+                /* Dropped one or more frames */
+                dev->stats.rx_over_errors++;
+
+        while (1) {
+                u32 desc_off = desc_offset(port, port->rxin, 0);
+                pkt_desc __iomem *desc;
+                u32 cda = sca_ina(dmac + CDAL, card);
+
+                if ((cda >= desc_off) && (cda < desc_off + sizeof(pkt_desc)))
+                        break;  /* No frame received */
+
+                desc = desc_address(port, port->rxin, 0);
+                stat = readb(&desc->stat);
+                if (!(stat & ST_RX_EOM))
+                        port->rxpart = 1; /* partial frame received */
+                else if ((stat & ST_ERROR_MASK) || port->rxpart) {
+                        dev->stats.rx_errors++;
+                        if (stat & ST_RX_OVERRUN)
+                                dev->stats.rx_fifo_errors++;
+                        else if ((stat & (ST_RX_SHORT | ST_RX_ABORT |
+                                          ST_RX_RESBIT)) || port->rxpart)
+                                dev->stats.rx_frame_errors++;
+                        else if (stat & ST_RX_CRC)
+                                dev->stats.rx_crc_errors++;
+                        if (stat & ST_RX_EOM)
+                                port->rxpart = 0; /* received last fragment */
+                } else
+                        sca_rx(card, port, desc, port->rxin);
+
+                /* Set new error descriptor address */
+                sca_outa(desc_off, dmac + EDAL, card);
+                port->rxin = next_desc(port, port->rxin, 0);
+        }
+
+        /* make sure RX DMA is enabled */
+        sca_out(DSR_DE, DSR_RX(phy_node(port)), card);
+}
+
+
+
+/* Transmit DMA interrupt service */
+static inline void sca_tx_intr(port_t *port)
+{
+        struct net_device *dev = port_to_dev(port);
+        u16 dmac = get_dmac_tx(port);
+        card_t* card = port_to_card(port);
+        u8 stat;
+
+        spin_lock(&port->lock);
+
+        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) {
+                pkt_desc __iomem *desc;
+
+                u32 desc_off = desc_offset(port, port->txlast, 1);
+                u32 cda = sca_ina(dmac + CDAL, card);
+                if ((cda >= desc_off) && (cda < desc_off + sizeof(pkt_desc)))
+                        break;  /* Transmitter is/will_be sending this frame */
+
+                desc = desc_address(port, port->txlast, 1);
+                dev->stats.tx_packets++;
+                dev->stats.tx_bytes += readw(&desc->len);
+                writeb(0, &desc->stat); /* Free descriptor */
+                port->txlast = next_desc(port, port->txlast, 1);
+        }
+
+        netif_wake_queue(dev);
+        spin_unlock(&port->lock);
+}
+
+
+
+static irqreturn_t sca_intr(int irq, void* dev_id)
+{
+        card_t *card = dev_id;
+        int i;
+        u8 stat;
+        int handled = 0;
+
+#ifndef ALL_PAGES_ALWAYS_MAPPED
+        u8 page = sca_get_page(card);
+#endif
+
+        while((stat = sca_intr_status(card)) != 0) {
+                handled = 1;
+                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);
+                        }
+                }
+        }
+
+#ifndef ALL_PAGES_ALWAYS_MAPPED
+        openwin(card, page);            /* Restore original page */
+#endif
+        return IRQ_RETVAL(handled);
+}
+
+
+
+static void sca_set_port(port_t *port)
+{
+        card_t* card = port_to_card(port);
+        u16 msci = get_msci(port);
+        u8 md2 = sca_in(msci + MD2, card);
+        unsigned int tmc, br = 10, brv = 1024;
+
+
+        if (port->settings.clock_rate > 0) {
+                /* Try lower br for better accuracy*/
+                do {
+                        br--;
+                        brv >>= 1; /* brv = 2^9 = 512 max in specs */
+
+                        /* Baud Rate = CLOCK_BASE / TMC / 2^BR */
+                        tmc = CLOCK_BASE / brv / port->settings.clock_rate;
+                }while (br > 1 && tmc <= 128);
+
+                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->settings.clock_rate = CLOCK_BASE / brv / tmc;
+        } else {
+                br = 9; /* Minimum clock rate */
+                tmc = 256;      /* 8bit = 0 */
+                port->settings.clock_rate = CLOCK_BASE / (256 * 512);
+        }
+
+        port->rxs = (port->rxs & ~CLK_BRG_MASK) | br;
+        port->txs = (port->txs & ~CLK_BRG_MASK) | br;
+        port->tmc = tmc;
+
+        /* baud divisor - time constant*/
+#ifdef __HD64570_H
+        sca_out(port->tmc, msci + TMC, card);
+#else
+        sca_out(port->tmc, msci + TMCR, card);
+        sca_out(port->tmc, msci + TMCT, card);
+#endif
+
+        /* Set BRG bits */
+        sca_out(port->rxs, msci + RXS, card);
+        sca_out(port->txs, msci + TXS, card);
+
+        if (port->settings.loopback)
+                md2 |= MD2_LOOPBACK;
+        else
+                md2 &= ~MD2_LOOPBACK;
+
+        sca_out(md2, msci + MD2, card);
+
+}
+
+
+
+static void sca_open(struct net_device *dev)
+{
+        port_t *port = dev_to_port(dev);
+        card_t* card = port_to_card(port);
+        u16 msci = get_msci(port);
+        u8 md0, md2;
+
+        switch(port->encoding) {
+        case ENCODING_NRZ:      md2 = MD2_NRZ;          break;
+        case ENCODING_NRZI:     md2 = MD2_NRZI;         break;
+        case ENCODING_FM_MARK:  md2 = MD2_FM_MARK;      break;
+        case ENCODING_FM_SPACE: md2 = MD2_FM_SPACE;     break;
+        default:                md2 = MD2_MANCHESTER;
+        }
+
+        if (port->settings.loopback)
+                md2 |= MD2_LOOPBACK;
+
+        switch(port->parity) {
+        case PARITY_CRC16_PR0:       md0 = MD0_HDLC | MD0_CRC_16_0;  break;
+        case PARITY_CRC16_PR1:       md0 = MD0_HDLC | MD0_CRC_16;    break;
+#ifdef __HD64570_H
+        case PARITY_CRC16_PR0_CCITT: md0 = MD0_HDLC | MD0_CRC_ITU_0; break;
+#else
+        case PARITY_CRC32_PR1_CCITT: md0 = MD0_HDLC | MD0_CRC_ITU32; break;
+#endif
+        case PARITY_CRC16_PR1_CCITT: md0 = MD0_HDLC | MD0_CRC_ITU;   break;
+        default:                     md0 = MD0_HDLC | MD0_CRC_NONE;
+        }
+
+        sca_out(CMD_RESET, msci + CMD, card);
+        sca_out(md0, 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 */
+#ifdef __HD64570_H
+        sca_out(CTL_IDLE, msci + CTL, card);
+#else
+        /* Skip the rest of underrun frame */
+        sca_out(CTL_IDLE | CTL_URCT | CTL_URSKP, msci + CTL, card);
+#endif
+
+#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 */
+        sca_out(0x3C, msci + TFS, card); /* +1 = TX start */
+        sca_out(0x38, msci + TCR, card); /* =Critical TX DMA activ condition */
+        sca_out(0x38, msci + TNR0, card); /* =TX DMA activation condition */
+        sca_out(0x3F, msci + TNR1, card); /* +1=TX DMA deactivation condition*/
+#endif
+
+/* We're using the following interrupts:
+   - TXINT (DMAC completed all transmisions, underrun or DCD change)
+   - all DMA interrupts
+*/
+
+        sca_set_carrier(port);
+
+#ifdef __HD64570_H
+        /* MSCI TX INT and RX INT A IRQ enable */
+        sca_out(IE0_TXINT | IE0_RXINTA, msci + IE0, card);
+        sca_out(IE1_UDRN | IE1_CDCD, msci + IE1, card);
+        sca_out(sca_in(IER0, card) | (phy_node(port) ? 0xC0 : 0x0C),
+                IER0, card); /* TXINT and RXINT */
+        /* enable DMA IRQ */
+        sca_out(sca_in(IER1, card) | (phy_node(port) ? 0xF0 : 0x0F),
+                IER1, card);
+#else
+        /* MSCI TXINT and RXINTA interrupt enable */
+        sca_outl(IE0_TXINT | IE0_RXINTA | IE0_UDRN | IE0_CDCD, msci + IE0,
+                 card);
+        /* DMA & MSCI IRQ enable */
+        sca_outl(sca_inl(IER0, card) |
+                 (phy_node(port) ? 0x0A006600 : 0x000A0066), IER0, card);
+#endif
+
+#ifdef __HD64570_H
+        sca_out(port->tmc, msci + TMC, card); /* Restore registers */
+#else
+        sca_out(port->tmc, msci + TMCR, card);
+        sca_out(port->tmc, msci + TMCT, card);
+#endif
+        sca_out(port->rxs, msci + RXS, card);
+        sca_out(port->txs, msci + TXS, card);
+        sca_out(CMD_TX_ENABLE, msci + CMD, card);
+        sca_out(CMD_RX_ENABLE, msci + CMD, card);
+
+        netif_start_queue(dev);
+}
+
+
+
+static void sca_close(struct net_device *dev)
+{
+        port_t *port = dev_to_port(dev);
+        card_t* card = port_to_card(port);
+
+        /* reset channel */
+        sca_out(CMD_RESET, get_msci(port) + CMD, port_to_card(port));
+#ifdef __HD64570_H
+        /* disable MSCI interrupts */
+        sca_out(sca_in(IER0, card) & (phy_node(port) ? 0x0F : 0xF0),
+                IER0, card);
+        /* disable DMA interrupts */
+        sca_out(sca_in(IER1, card) & (phy_node(port) ? 0x0F : 0xF0),
+                IER1, card);
+#else
+        /* disable DMA & MSCI IRQ */
+        sca_outl(sca_inl(IER0, card) &
+                 (phy_node(port) ? 0x00FF00FF : 0xFF00FF00), IER0, card);
+#endif
+        netif_stop_queue(dev);
+}
+
+
+
+static int sca_attach(struct net_device *dev, unsigned short encoding,
+                      unsigned short parity)
+{
+        if (encoding != ENCODING_NRZ &&
+            encoding != ENCODING_NRZI &&
+            encoding != ENCODING_FM_MARK &&
+            encoding != ENCODING_FM_SPACE &&
+            encoding != ENCODING_MANCHESTER)
+                return -EINVAL;
+
+        if (parity != PARITY_NONE &&
+            parity != PARITY_CRC16_PR0 &&
+            parity != PARITY_CRC16_PR1 &&
+#ifdef __HD64570_H
+            parity != PARITY_CRC16_PR0_CCITT &&
+#else
+            parity != PARITY_CRC32_PR1_CCITT &&
+#endif
+            parity != PARITY_CRC16_PR1_CCITT)
+                return -EINVAL;
+
+        dev_to_port(dev)->encoding = encoding;
+        dev_to_port(dev)->parity = parity;
+        return 0;
+}
+
+
+
+#ifdef DEBUG_RINGS
+static void sca_dump_rings(struct net_device *dev)
+{
+        port_t *port = dev_to_port(dev);
+        card_t *card = port_to_card(port);
+        u16 cnt;
+#if !defined(PAGE0_ALWAYS_MAPPED) && !defined(ALL_PAGES_ALWAYS_MAPPED)
+        u8 page;
+#endif
+
+#if !defined(PAGE0_ALWAYS_MAPPED) && !defined(ALL_PAGES_ALWAYS_MAPPED)
+        page = sca_get_page(card);
+        openwin(card, 0);
+#endif
+
+        printk(KERN_DEBUG "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)->rx_ring_buffers; cnt++)
+                printk(" %02X", readb(&(desc_address(port, cnt, 0)->stat)));
+
+        printk("\n" KERN_DEBUG "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)->tx_ring_buffers; cnt++)
+                printk(" %02X", readb(&(desc_address(port, cnt, 1)->stat)));
+        printk("\n");
+
+        printk(KERN_DEBUG "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_DEBUG "ILAR: %02x ISR: %08x %08x\n", sca_in(ILAR, card),
+               sca_inl(ISR0, card), sca_inl(ISR1, card));
+#else
+        printk(KERN_DEBUG "ISR: %02x %02x %02x\n", sca_in(ISR0, card),
+               sca_in(ISR1, card), sca_in(ISR2, card));
+#endif
+
+#if !defined(PAGE0_ALWAYS_MAPPED) && !defined(ALL_PAGES_ALWAYS_MAPPED)
+        openwin(card, page); /* Restore original page */
+#endif
+}
+#endif /* DEBUG_RINGS */
+
+
+
+static int sca_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+        port_t *port = dev_to_port(dev);
+        card_t *card = port_to_card(port);
+        pkt_desc __iomem *desc;
+        u32 buff, len;
+#ifndef ALL_PAGES_ALWAYS_MAPPED
+        u8 page;
+        u32 maxlen;
+#endif
+
+        spin_lock_irq(&port->lock);
+
+        desc = desc_address(port, port->txin + 1, 1);
+        if (readb(&desc->stat)) { /* allow 1 packet gap */
+                /* should never happen - previous xmit should stop queue */
+#ifdef DEBUG_PKT
+                printk(KERN_DEBUG "%s: transmitter buffer full\n", dev->name);
+#endif
+                netif_stop_queue(dev);
+                spin_unlock_irq(&port->lock);
+                return 1;       /* request packet to be queued */
+        }
+
+#ifdef DEBUG_PKT
+        printk(KERN_DEBUG "%s TX(%i):", dev->name, skb->len);
+        debug_frame(skb);
+#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);
+        dev->trans_start = jiffies;
+
+        port->txin = next_desc(port, port->txin, 1);
+        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 */
+
+        desc = desc_address(port, port->txin + 1, 1);
+        if (readb(&desc->stat)) /* allow 1 packet gap */
+                netif_stop_queue(dev);
+
+        spin_unlock_irq(&port->lock);
+
+        dev_kfree_skb(skb);
+        return 0;
+}
+
+
+
+#ifdef NEED_DETECT_RAM
+static u32 __devinit sca_detect_ram(card_t *card, u8 __iomem *rambase, u32 ramsize)
+{
+        /* Round RAM size to 32 bits, fill from end to start */
+        u32 i = ramsize &= ~3;
+
+#ifndef ALL_PAGES_ALWAYS_MAPPED
+        u32 size = winsize(card);
+
+        openwin(card, (i - 4) / size); /* select last window */
+#endif
+        do {
+                i -= 4;
+#ifndef ALL_PAGES_ALWAYS_MAPPED
+                if ((i + 4) % size == 0)
+                        openwin(card, i / size);
+                writel(i ^ 0x12345678, rambase + i % size);
+#else
+                writel(i ^ 0x12345678, rambase + i);
+#endif
+        }while (i > 0);
+
+        for (i = 0; i < ramsize ; i += 4) {
+#ifndef ALL_PAGES_ALWAYS_MAPPED
+                if (i % size == 0)
+                        openwin(card, i / size);
+
+                if (readl(rambase + i % size) != (i ^ 0x12345678))
+                        break;
+#else
+                if (readl(rambase + i) != (i ^ 0x12345678))
+                        break;
+#endif
+        }
+
+        return i;
+}
+#endif /* NEED_DETECT_RAM */
+
+
+
+static void __devinit 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, 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 */
+}