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