1 files changed, 392 insertions, 0 deletions
diff --git a/drivers/net/wan/sealevel.c b/drivers/net/wan/sealevel.c
new file mode 100644
index 000000000..7dddc9dcb
--- /dev/null
+++ b/drivers/net/wan/sealevel.c
@@ -0,0 +1,392 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *	Sealevel Systems 4021 driver.
+ *
+ *	(c) Copyright 1999, 2001 Alan Cox
+ *	(c) Copyright 2001 Red Hat Inc.
+ *	Generic HDLC port Copyright (C) 2008 Krzysztof Halasa <khc@pm.waw.pl>
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/net.h>
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <linux/if_arp.h>
+#include <linux/delay.h>
+#include <linux/hdlc.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <net/arp.h>
+
+#include <asm/irq.h>
+#include <asm/io.h>
+#include <asm/dma.h>
+#include <asm/byteorder.h>
+#include "z85230.h"
+
+
+struct slvl_device
+{
+	struct z8530_channel *chan;
+	int channel;
+};
+
+
+struct slvl_board
+{
+	struct slvl_device dev[2];
+	struct z8530_dev board;
+	int iobase;
+};
+
+/*
+ *	Network driver support routines
+ */
+
+static inline struct slvl_device* dev_to_chan(struct net_device *dev)
+{
+	return (struct slvl_device *)dev_to_hdlc(dev)->priv;
+}
+
+/*
+ *	Frame receive. Simple for our card as we do HDLC and there
+ *	is no funny garbage involved
+ */
+
+static void sealevel_input(struct z8530_channel *c, struct sk_buff *skb)
+{
+	/* Drop the CRC - it's not a good idea to try and negotiate it ;) */
+	skb_trim(skb, skb->len - 2);
+	skb->protocol = hdlc_type_trans(skb, c->netdevice);
+	skb_reset_mac_header(skb);
+	skb->dev = c->netdevice;
+	netif_rx(skb);
+}
+
+/*
+ *	We've been placed in the UP state
+ */
+
+static int sealevel_open(struct net_device *d)
+{
+	struct slvl_device *slvl = dev_to_chan(d);
+	int err = -1;
+	int unit = slvl->channel;
+
+	/*
+	 *	Link layer up.
+	 */
+
+	switch (unit) {
+		case 0:
+			err = z8530_sync_dma_open(d, slvl->chan);
+			break;
+		case 1:
+			err = z8530_sync_open(d, slvl->chan);
+			break;
+	}
+
+	if (err)
+		return err;
+
+	err = hdlc_open(d);
+	if (err) {
+		switch (unit) {
+			case 0:
+				z8530_sync_dma_close(d, slvl->chan);
+				break;
+			case 1:
+				z8530_sync_close(d, slvl->chan);
+				break;
+		}
+		return err;
+	}
+
+	slvl->chan->rx_function = sealevel_input;
+
+	/*
+	 *	Go go go
+	 */
+	netif_start_queue(d);
+	return 0;
+}
+
+static int sealevel_close(struct net_device *d)
+{
+	struct slvl_device *slvl = dev_to_chan(d);
+	int unit = slvl->channel;
+
+	/*
+	 *	Discard new frames
+	 */
+
+	slvl->chan->rx_function = z8530_null_rx;
+
+	hdlc_close(d);
+	netif_stop_queue(d);
+
+	switch (unit) {
+		case 0:
+			z8530_sync_dma_close(d, slvl->chan);
+			break;
+		case 1:
+			z8530_sync_close(d, slvl->chan);
+			break;
+	}
+	return 0;
+}
+
+static int sealevel_ioctl(struct net_device *d, struct ifreq *ifr, int cmd)
+{
+	/* struct slvl_device *slvl=dev_to_chan(d);
+	   z8530_ioctl(d,&slvl->sync.chanA,ifr,cmd) */
+	return hdlc_ioctl(d, ifr, cmd);
+}
+
+/*
+ *	Passed network frames, fire them downwind.
+ */
+
+static netdev_tx_t sealevel_queue_xmit(struct sk_buff *skb,
+					     struct net_device *d)
+{
+	return z8530_queue_xmit(dev_to_chan(d)->chan, skb);
+}
+
+static int sealevel_attach(struct net_device *dev, unsigned short encoding,
+			   unsigned short parity)
+{
+	if (encoding == ENCODING_NRZ && parity == PARITY_CRC16_PR1_CCITT)
+		return 0;
+	return -EINVAL;
+}
+
+static const struct net_device_ops sealevel_ops = {
+	.ndo_open       = sealevel_open,
+	.ndo_stop       = sealevel_close,
+	.ndo_start_xmit = hdlc_start_xmit,
+	.ndo_do_ioctl   = sealevel_ioctl,
+};
+
+static int slvl_setup(struct slvl_device *sv, int iobase, int irq)
+{
+	struct net_device *dev = alloc_hdlcdev(sv);
+	if (!dev)
+		return -1;
+
+	dev_to_hdlc(dev)->attach = sealevel_attach;
+	dev_to_hdlc(dev)->xmit = sealevel_queue_xmit;
+	dev->netdev_ops = &sealevel_ops;
+	dev->base_addr = iobase;
+	dev->irq = irq;
+
+	if (register_hdlc_device(dev)) {
+		pr_err("unable to register HDLC device\n");
+		free_netdev(dev);
+		return -1;
+	}
+
+	sv->chan->netdevice = dev;
+	return 0;
+}
+
+
+/*
+ *	Allocate and setup Sealevel board.
+ */
+
+static __init struct slvl_board *slvl_init(int iobase, int irq,
+					   int txdma, int rxdma, int slow)
+{
+	struct z8530_dev *dev;
+	struct slvl_board *b;
+
+	/*
+	 *	Get the needed I/O space
+	 */
+
+	if (!request_region(iobase, 8, "Sealevel 4021")) {
+		pr_warn("I/O 0x%X already in use\n", iobase);
+		return NULL;
+	}
+
+	b = kzalloc(sizeof(struct slvl_board), GFP_KERNEL);
+	if (!b)
+		goto err_kzalloc;
+
+	b->dev[0].chan = &b->board.chanA;
+	b->dev[0].channel = 0;
+
+	b->dev[1].chan = &b->board.chanB;
+	b->dev[1].channel = 1;
+
+	dev = &b->board;
+
+	/*
+	 *	Stuff in the I/O addressing
+	 */
+
+	dev->active = 0;
+
+	b->iobase = iobase;
+
+	/*
+	 *	Select 8530 delays for the old board
+	 */
+
+	if (slow)
+		iobase |= Z8530_PORT_SLEEP;
+
+	dev->chanA.ctrlio = iobase + 1;
+	dev->chanA.dataio = iobase;
+	dev->chanB.ctrlio = iobase + 3;
+	dev->chanB.dataio = iobase + 2;
+
+	dev->chanA.irqs = &z8530_nop;
+	dev->chanB.irqs = &z8530_nop;
+
+	/*
+	 *	Assert DTR enable DMA
+	 */
+
+	outb(3 | (1 << 7), b->iobase + 4);
+
+
+	/* We want a fast IRQ for this device. Actually we'd like an even faster
+	   IRQ ;) - This is one driver RtLinux is made for */
+
+	if (request_irq(irq, z8530_interrupt, 0,
+			"SeaLevel", dev) < 0) {
+		pr_warn("IRQ %d already in use\n", irq);
+		goto err_request_irq;
+	}
+
+	dev->irq = irq;
+	dev->chanA.private = &b->dev[0];
+	dev->chanB.private = &b->dev[1];
+	dev->chanA.dev = dev;
+	dev->chanB.dev = dev;
+
+	dev->chanA.txdma = 3;
+	dev->chanA.rxdma = 1;
+	if (request_dma(dev->chanA.txdma, "SeaLevel (TX)"))
+		goto err_dma_tx;
+
+	if (request_dma(dev->chanA.rxdma, "SeaLevel (RX)"))
+		goto err_dma_rx;
+
+	disable_irq(irq);
+
+	/*
+	 *	Begin normal initialise
+	 */
+
+	if (z8530_init(dev) != 0) {
+		pr_err("Z8530 series device not found\n");
+		enable_irq(irq);
+		goto free_hw;
+	}
+	if (dev->type == Z85C30) {
+		z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream);
+		z8530_channel_load(&dev->chanB, z8530_hdlc_kilostream);
+	} else {
+		z8530_channel_load(&dev->chanA, z8530_hdlc_kilostream_85230);
+		z8530_channel_load(&dev->chanB, z8530_hdlc_kilostream_85230);
+	}
+
+	/*
+	 *	Now we can take the IRQ
+	 */
+
+	enable_irq(irq);
+
+	if (slvl_setup(&b->dev[0], iobase, irq))
+		goto free_hw;
+	if (slvl_setup(&b->dev[1], iobase, irq))
+		goto free_netdev0;
+
+	z8530_describe(dev, "I/O", iobase);
+	dev->active = 1;
+	return b;
+
+free_netdev0:
+	unregister_hdlc_device(b->dev[0].chan->netdevice);
+	free_netdev(b->dev[0].chan->netdevice);
+free_hw:
+	free_dma(dev->chanA.rxdma);
+err_dma_rx:
+	free_dma(dev->chanA.txdma);
+err_dma_tx:
+	free_irq(irq, dev);
+err_request_irq:
+	kfree(b);
+err_kzalloc:
+	release_region(iobase, 8);
+	return NULL;
+}
+
+static void __exit slvl_shutdown(struct slvl_board *b)
+{
+	int u;
+
+	z8530_shutdown(&b->board);
+
+	for (u = 0; u < 2; u++) {
+		struct net_device *d = b->dev[u].chan->netdevice;
+		unregister_hdlc_device(d);
+		free_netdev(d);
+	}
+
+	free_irq(b->board.irq, &b->board);
+	free_dma(b->board.chanA.rxdma);
+	free_dma(b->board.chanA.txdma);
+	/* DMA off on the card, drop DTR */
+	outb(0, b->iobase);
+	release_region(b->iobase, 8);
+	kfree(b);
+}
+
+
+static int io=0x238;
+static int txdma=1;
+static int rxdma=3;
+static int irq=5;
+static bool slow=false;
+
+module_param_hw(io, int, ioport, 0);
+MODULE_PARM_DESC(io, "The I/O base of the Sealevel card");
+module_param_hw(txdma, int, dma, 0);
+MODULE_PARM_DESC(txdma, "Transmit DMA channel");
+module_param_hw(rxdma, int, dma, 0);
+MODULE_PARM_DESC(rxdma, "Receive DMA channel");
+module_param_hw(irq, int, irq, 0);
+MODULE_PARM_DESC(irq, "The interrupt line setting for the SeaLevel card");
+module_param(slow, bool, 0);
+MODULE_PARM_DESC(slow, "Set this for an older Sealevel card such as the 4012");
+
+MODULE_AUTHOR("Alan Cox");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Modular driver for the SeaLevel 4021");
+
+static struct slvl_board *slvl_unit;
+
+static int __init slvl_init_module(void)
+{
+	slvl_unit = slvl_init(io, irq, txdma, rxdma, slow);
+
+	return slvl_unit ? 0 : -ENODEV;
+}
+
+static void __exit slvl_cleanup_module(void)
+{
+	if (slvl_unit)
+		slvl_shutdown(slvl_unit);
+}
+
+module_init(slvl_init_module);
+module_exit(slvl_cleanup_module);