diff options
Diffstat (limited to 'drivers/net/wan/sealevel.c')
| -rw-r--r-- | drivers/net/wan/sealevel.c | 397 |
1 files changed, 397 insertions, 0 deletions
diff --git a/drivers/net/wan/sealevel.c b/drivers/net/wan/sealevel.c new file mode 100644 index 000000000..c56f2c252 --- /dev/null +++ b/drivers/net/wan/sealevel.c @@ -0,0 +1,397 @@ +/* + * Sealevel Systems 4021 driver. + * + * 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. + * + * (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); |