diff options
Diffstat (limited to 'kernel/drivers/net/wan/hostess_sv11.c')
| -rw-r--r-- | kernel/drivers/net/wan/hostess_sv11.c | 352 |
1 files changed, 352 insertions, 0 deletions
diff --git a/kernel/drivers/net/wan/hostess_sv11.c b/kernel/drivers/net/wan/hostess_sv11.c new file mode 100644 index 000000000..3d741663f --- /dev/null +++ b/kernel/drivers/net/wan/hostess_sv11.c @@ -0,0 +1,352 @@ +/* + * Comtrol SV11 card driver + * + * This is a slightly odd Z85230 synchronous driver. All you need to + * know basically is + * + * Its a genuine Z85230 + * + * It supports DMA using two DMA channels in SYNC mode. The driver doesn't + * use these facilities + * + * The control port is at io+1, the data at io+3 and turning off the DMA + * is done by writing 0 to io+4 + * + * The hardware does the bus handling to avoid the need for delays between + * touching control registers. + * + * Port B isn't wired (why - beats me) + * + * 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/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" + +static int dma; + +/* + * Network driver support routines + */ + +static inline struct z8530_dev* dev_to_sv(struct net_device *dev) +{ + return (struct z8530_dev *)dev_to_hdlc(dev)->priv; +} + +/* + * Frame receive. Simple for our card as we do HDLC and there + * is no funny garbage involved + */ + +static void hostess_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; + /* + * Send it to the PPP layer. We don't have time to process + * it right now. + */ + netif_rx(skb); +} + +/* + * We've been placed in the UP state + */ + +static int hostess_open(struct net_device *d) +{ + struct z8530_dev *sv11 = dev_to_sv(d); + int err = -1; + + /* + * Link layer up + */ + switch (dma) { + case 0: + err = z8530_sync_open(d, &sv11->chanA); + break; + case 1: + err = z8530_sync_dma_open(d, &sv11->chanA); + break; + case 2: + err = z8530_sync_txdma_open(d, &sv11->chanA); + break; + } + + if (err) + return err; + + err = hdlc_open(d); + if (err) { + switch (dma) { + case 0: + z8530_sync_close(d, &sv11->chanA); + break; + case 1: + z8530_sync_dma_close(d, &sv11->chanA); + break; + case 2: + z8530_sync_txdma_close(d, &sv11->chanA); + break; + } + return err; + } + sv11->chanA.rx_function = hostess_input; + + /* + * Go go go + */ + + netif_start_queue(d); + return 0; +} + +static int hostess_close(struct net_device *d) +{ + struct z8530_dev *sv11 = dev_to_sv(d); + /* + * Discard new frames + */ + sv11->chanA.rx_function = z8530_null_rx; + + hdlc_close(d); + netif_stop_queue(d); + + switch (dma) { + case 0: + z8530_sync_close(d, &sv11->chanA); + break; + case 1: + z8530_sync_dma_close(d, &sv11->chanA); + break; + case 2: + z8530_sync_txdma_close(d, &sv11->chanA); + break; + } + return 0; +} + +static int hostess_ioctl(struct net_device *d, struct ifreq *ifr, int cmd) +{ + /* struct z8530_dev *sv11=dev_to_sv(d); + z8530_ioctl(d,&sv11->chanA,ifr,cmd) */ + return hdlc_ioctl(d, ifr, cmd); +} + +/* + * Passed network frames, fire them downwind. + */ + +static netdev_tx_t hostess_queue_xmit(struct sk_buff *skb, + struct net_device *d) +{ + return z8530_queue_xmit(&dev_to_sv(d)->chanA, skb); +} + +static int hostess_attach(struct net_device *dev, unsigned short encoding, + unsigned short parity) +{ + if (encoding == ENCODING_NRZ && parity == PARITY_CRC16_PR1_CCITT) + return 0; + return -EINVAL; +} + +/* + * Description block for a Comtrol Hostess SV11 card + */ + +static const struct net_device_ops hostess_ops = { + .ndo_open = hostess_open, + .ndo_stop = hostess_close, + .ndo_change_mtu = hdlc_change_mtu, + .ndo_start_xmit = hdlc_start_xmit, + .ndo_do_ioctl = hostess_ioctl, +}; + +static struct z8530_dev *sv11_init(int iobase, int irq) +{ + struct z8530_dev *sv; + struct net_device *netdev; + /* + * Get the needed I/O space + */ + + if (!request_region(iobase, 8, "Comtrol SV11")) { + pr_warn("I/O 0x%X already in use\n", iobase); + return NULL; + } + + sv = kzalloc(sizeof(struct z8530_dev), GFP_KERNEL); + if (!sv) + goto err_kzalloc; + + /* + * Stuff in the I/O addressing + */ + + sv->active = 0; + + sv->chanA.ctrlio = iobase + 1; + sv->chanA.dataio = iobase + 3; + sv->chanB.ctrlio = -1; + sv->chanB.dataio = -1; + sv->chanA.irqs = &z8530_nop; + sv->chanB.irqs = &z8530_nop; + + outb(0, iobase + 4); /* DMA off */ + + /* 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, + "Hostess SV11", sv) < 0) { + pr_warn("IRQ %d already in use\n", irq); + goto err_irq; + } + + sv->irq = irq; + sv->chanA.private = sv; + sv->chanA.dev = sv; + sv->chanB.dev = sv; + + if (dma) { + /* + * You can have DMA off or 1 and 3 thats the lot + * on the Comtrol. + */ + sv->chanA.txdma = 3; + sv->chanA.rxdma = 1; + outb(0x03 | 0x08, iobase + 4); /* DMA on */ + if (request_dma(sv->chanA.txdma, "Hostess SV/11 (TX)")) + goto err_txdma; + + if (dma == 1) + if (request_dma(sv->chanA.rxdma, "Hostess SV/11 (RX)")) + goto err_rxdma; + } + + /* Kill our private IRQ line the hostess can end up chattering + until the configuration is set */ + disable_irq(irq); + + /* + * Begin normal initialise + */ + + if (z8530_init(sv)) { + pr_err("Z8530 series device not found\n"); + enable_irq(irq); + goto free_dma; + } + z8530_channel_load(&sv->chanB, z8530_dead_port); + if (sv->type == Z85C30) + z8530_channel_load(&sv->chanA, z8530_hdlc_kilostream); + else + z8530_channel_load(&sv->chanA, z8530_hdlc_kilostream_85230); + + enable_irq(irq); + + /* + * Now we can take the IRQ + */ + + sv->chanA.netdevice = netdev = alloc_hdlcdev(sv); + if (!netdev) + goto free_dma; + + dev_to_hdlc(netdev)->attach = hostess_attach; + dev_to_hdlc(netdev)->xmit = hostess_queue_xmit; + netdev->netdev_ops = &hostess_ops; + netdev->base_addr = iobase; + netdev->irq = irq; + + if (register_hdlc_device(netdev)) { + pr_err("unable to register HDLC device\n"); + free_netdev(netdev); + goto free_dma; + } + + z8530_describe(sv, "I/O", iobase); + sv->active = 1; + return sv; + +free_dma: + if (dma == 1) + free_dma(sv->chanA.rxdma); +err_rxdma: + if (dma) + free_dma(sv->chanA.txdma); +err_txdma: + free_irq(irq, sv); +err_irq: + kfree(sv); +err_kzalloc: + release_region(iobase, 8); + return NULL; +} + +static void sv11_shutdown(struct z8530_dev *dev) +{ + unregister_hdlc_device(dev->chanA.netdevice); + z8530_shutdown(dev); + free_irq(dev->irq, dev); + if (dma) { + if (dma == 1) + free_dma(dev->chanA.rxdma); + free_dma(dev->chanA.txdma); + } + release_region(dev->chanA.ctrlio - 1, 8); + free_netdev(dev->chanA.netdevice); + kfree(dev); +} + +static int io = 0x200; +static int irq = 9; + +module_param(io, int, 0); +MODULE_PARM_DESC(io, "The I/O base of the Comtrol Hostess SV11 card"); +module_param(dma, int, 0); +MODULE_PARM_DESC(dma, "Set this to 1 to use DMA1/DMA3 for TX/RX"); +module_param(irq, int, 0); +MODULE_PARM_DESC(irq, "The interrupt line setting for the Comtrol Hostess SV11 card"); + +MODULE_AUTHOR("Alan Cox"); +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Modular driver for the Comtrol Hostess SV11"); + +static struct z8530_dev *sv11_unit; + +int init_module(void) +{ + if ((sv11_unit = sv11_init(io, irq)) == NULL) + return -ENODEV; + return 0; +} + +void cleanup_module(void) +{ + if (sv11_unit) + sv11_shutdown(sv11_unit); +} |