--- /dev/null
+/*
+ * 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);
+}
Code Review / kvmfornfv.git / blobdiff